Browse Topic: Lubricating oils

Items (2,071)

A critical evaluation of laboratory test methods used to assess coke formation tendency in synthetic lubricants

2025-28-0036To be published on 02/07/2025

Lubricating oil in combustion engines undergoes thermal degradation under high temperatures and forms solid deposits. These solid deposits, also referred as coke are insidious, black, and carbonaceous solids. To mitigate the problems associated with oil coking, an effective testing methodology must be developed to characterize the coke formation qualitatively and quantitatively. Testing methodologies have been developed to measure coking tendency however some of the international standards such as the SAE ARP 6166 use visual inspection methods to quantify coke. Such methods are unsuitable for advanced research as they are prone to error in human judgment. This paper intends to bridge this gap and discusses a test methodology that can measure the formed coke quantitatively and qualitatively. The formation of coke has been studied under different laboratory methods such as static immersion test, thin film oxidation test, and dynamic test to replicate the various conditions in which coke

Jeyaseelan, Thangaraja, S, Shanmugasundaram, Bansal, Lalit, Negi, Ashish, Koka, Tirumala Rao, Das, Arnab

A Quasi-Two-Dimensional Approach in Laminar Flow of Lubricating Oil and Grease

04-18-02-0007

12/09/2024

The overarching objective of the present study is to apply a quasi-two-dimensional approach to analyze the laminar flow of lubricating oil. Lubricating oils are non-Newtonian by nature. For these types of oils, the Sisko fluid model is the most suitable model of the nonlinear stress–strain relationship for these types of oils. It is hoped that by omitting the dependence of flow quantities in one direction, more qualitative information can be obtained on the characteristics of the purely three-dimensional boundary layer flow of lubricating oils. Some of the most familiar flow geometries discussed are steady flow over a flat plate, a corner of a wedge, and a stagnation region; steady flow in a convergent and divergent channel; and impulsively started flow over an infinite flat plate and semi-infinite flat plate. The governing equations of all flow geometries are transformed into nonlinear ordinary differential equations (ODE) using the free parameter transformation. The results are

Patel, Manisha, Bariya, H.G.

Development of Lubricants Using Re-Refined Base Stocks—An Effort toward Circular Economy

04-18-02-0008

12/06/2024

Re-refining of used lubricating oil is an economically attractive and effective recycling method that contributes significantly to resource conservation and environmental protection. The effective re-refining process of used lubricating oil undergoes thorough purification to remove contaminants and to produce high yield and good quality base oil suitable for reuse in lubricant formulation. Used lubricating oils have various hazardous materials, these can be processed with safe and efficient methods required to recover high-quality base oil products. Typically, used lubricating oil is a mixture of various types of additives, base oils, and viscometric grades as per the different types automotive and industrial applications. Re-refined base oils can be re-used to produce lubricants such as industrial and automotive lubricants like passenger car motor oils, transmission fluids, hydraulic oils, and gear oils. API classified base oils into two categories namely mineral base oils API Group I

Maloth, Swamy, Joshi, Ratnadeep S., Mishra, Gopal Swaroop, Samant, Nagesh N., Bhadhavath, Sanker, Seth, Sarita, Bhardwaj, Anil, Paul, Subinoy, Arora, Ajay Kumar, Maheshwari, Mukul

Single Crankshaft Opposed Piston Heat Rejection Measurement and Simulation on High Power Density Engines for Future Ground Combat Vehicle Power Pack Configurations

2024-01-3593

11/15/2024

ABSTRACT This paper discusses inherent advantages and additional design changes that can be made to a single crankshaft opposed piston engine (SCOPE) in order to satisfy military engine heat rejection-to-power requirements of 0.45. The paper starts off with a discussion of the currently demonstrated heat rejection to power levels being obtained with the commercial version of the SCOPE configuration. Here, it is seen that heat rejection-to-power ratios are approximately 0.69. Tests are ongoing and this value is considered preliminary in nature. Analytical results are then presented that decompose where the heat is being generated - for the intake air system, the coolant system, and also the oil lubrication system. The model includes consideration of heat generated from the engines turbochargers, cylinders, pistons, and gear train. The model is anchored to measurements made with a commercial version of the SCOPE engine. Engine heat rejection results for this baseline configuration

Kacynski, Ken, Johnson, S. Arnie, Huo, Ming, Yancone, J., Katech, Chris Meszaros

Towards Robust Hydrogen Combustion: Precise Lube Oil Consumption Measurement as an Enabler for Tackling Pre-Ignition

2024-01-4290

11/05/2024

The use of carbon-free fuels, such as ammonia or hydrogen, or at least carbon neutral fuels, such as green methane or methanol is one of the most important paths in the development of low-carbon internal combustion engines (ICE). Especially for large, heavy-duty engines, this is a promising route, as replacing them with battery electric or fuel cell drives poses even greater challenges, at least for the time being. For some applications or areas of the world, small ICEs for trucks, passenger cars or off-road vehicles, operated with alternative fuels will still remain the means of choice. One of the biggest challenges in the development of hydrogen combustion engines is achieving high compression ratios and mean effective pressures due to combustion anomalies, caused by the low ignition delay and broad flammability limit of hydrogen. Oil droplets are considered to be one of the main triggers for pre-ignition and knocking. This paper will give a brief introduction, showing the results of

Rossegger, Bernhard, Grabner, Peter, Gschiel, Kevin, Vareka, Martin

The Effect on Soot Handling and Friction of Selected Dispersant Additives for Next Generation Transportation Sector Oils

2024-01-4301

11/05/2024

Next generation lubricating oils for transportation sector require higher durability in operation, compatibility with new engine technologies and aftertreatment devices as well as high fuel economy (FE), thus contributing to the reduction of CO2 emissions, both in passenger cars and heavy-duty vehicles. The current paper aims to highlight the impact of dispersant main properties in preventing sludge and deposits formation on engine surfaces. The effect on frictional properties of lubricating oils through a multi-step activity was evaluated. Oil contamination by soot is a big concern not only for diesel but also for new generation of direct injection gasoline (GDI) engines. The presence of soot leads to oil thickening that heavily impacts on friction coefficient thus enhancing the role of dispersant in controlling soot and related viscosity increase and, indirectly, fuel consumption for long running periods. After an introduction on dispersant technologies, the focus of the paper moves

Lattuada, Marco, Manni, Massimo, Notari, Marcello, Ferraro, Giovanni, Fratini, Emiliano

Lubricating Oil, Aircraft Piston Engine (Ashless Dispersant

J1899_202410 (Current)

10/28/2024

This SAE Standard establishes the requirements for lubricating oils containing ashless dispersant additives to be used in four-stroke cycle, reciprocating piston aircraft engines. This document covers the same lubricating oil requirements as the former military specification MIL-L-22851. Users should consult their airframe or engine manufacturer’s manuals for the latest listing of acceptable lubricants. Compliance with this specification must be accomplished in accordance with the Performance Review Institute (PRI) product qualification process as described in the documents referenced in 2.1.3. Requests for submittal information may be made to the PRI at the address shown in 2.1.3, referencing this specification. Products qualified to this specification are listed on a Qualified Products List (QPL) managed by the PRI. Approval and/or certification for use of a specific piston engine oil in aero applications is the responsibility of the individual equipment builders and/or governmental

E-38 Aviation Piston Engine Fuels and Lubricants

Influence of Lube Oil and Fuel Additives on the Particulate Raw Emission Behavior of Gasoline Engines

04-18-01-0004

10/03/2024

The aim of this work was to investigate the influence of different combinations of engine oil and oil additive as well as additivated and unadditivated fuel on particulate emissions in gasoline engines. To accomplish this, load, speed, and type of oil injection were varied on a single-cylinder engine, and the influence on particle number concentration and size distribution were evaluated. The tests were supplemented by an optical investigation of their in-cylinder soot formation. The investigation of fuel additives showed no significant differences compared to the reference fuel without additives. However, in the case of oil additives, detergents led to a significant increase in the number of particles in the <20 nm range. This effect occurred when used as both a single additive and a component in the standard engine oil. While viscosity improvers also lead to a measurable, but less pronounced, increase in the particle number concentration, no significant influence can be determined

Böhmeke, Christian, Heinz, Lukas, Wagner, Uwe, Koch, Thomas

Influences of Lubricant Viscosity and Metallic Content on Diesel Soot Oxidation Reactivity

2024-01-5084

08/23/2024

This study examined the effects of lubricant viscosity and metallic content on the oxidation reactivity of diesel particles. In the first part, the factors affecting thermogravimetric analysis (TGA) experiments was discussed and confirmed. The influences of initial soot mass, heating rate, and airflow rate on soot oxidation rate and experimental reproducibility were investigated to develop an optimized TGA method. On the basis of these experiments, an initial soot mass of 2.0 mg, airflow rate of 4.8 L/h, and heating rate of 2.5°C/h were used for all subsequent TGA tests. It could be found that the TGA experiments had high repeatability, and the differences were less than 0.1%. In the second part, a four-cylinder diesel engine was lubricated with seven kinds of lubricant with different viscosity and metallic content by the use of viscosity index improver (VII), antioxidant and corrosion inhibitor (ACI), and ashless dispersant (AD). Particle samples were subjected to TGA to test their

Meng, Hao, Yang, He, Zhang, Weili, Xing, Jianqiang, Xu, Yan, Wang, Yajun

Lubricating Oils, Aircraft Piston Engine (Non-Dispersant

J1966_202408 (Current)

08/19/2024

This SAE Standard establishes the requirements for non-dispersant lubricating oils to be used in four-stroke cycle piston aircraft engines. This document covers the same lubricating oil requirements as the former military specification MIL-L-6082. Users should consult their airframe or engine manufacturers’ manuals for the latest listing of acceptable lubricants. Compliance with this specification must be accomplished in accordance with the Performance Review Institute (PRI) product qualification process as described in the documents referenced in 2.2.2. Requests for submittal information may be made to the PRI at the address shown in 2.2.2, referencing this specification. Products qualified to this specification are listed on a Qualified Products List (QPL) managed by the PRI. Approval and/or certification for use of a specific piston engine oil in aerospace applications is the responsibility of the individual equipment builders and/or governmental authorities and may be accomplished

E-38 Aviation Piston Engine Fuels and Lubricants

Elastomer: Fluorosilicone Rubber (FVMQ) Fuel and Oil Resistant 65 – 75 Durometer Type ‘A’ Hardness For Products in Fuel Systems/Lubricating Oils

AMS3331D (Current)

08/12/2024

This specification covers a fluorosilicone (FVMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used for molded rings, compression seals, molded O-rings or molded O-ring cord, and molded in place gaskets for aeronautical and aerospace applications

AMS CE Elastomers Committee

Challenges of Measuring Low Levels of CO ₂ and NO _x on H ₂ -ICE

2024-01-2998

07/02/2024

Society is moving towards climate neutrality where hydrogen fuelled combustion engines (H2 ICE) could be considered a main technology. These engines run on hydrogen (H2) so carbon-based emission are only present at a very low level from the lube oil. The most important pollutants NO and NO2 are caused by the exhaust aftertreatment system as well as CO2 coming from the ambient air. For standard measurement technologies these low levels of CO2 are hard to detect due to the high-water content. Normal levels of CO2 are between 400-500 ppm which is very close or even below the detection limit of commonly used non-dispersive-infrared-detectors (NDIR). As well the high-water content is very challenging for NOx measuring devices, like chemiluminescence detectors (CLD), where it results in higher noise and therefore a worse detection limit. Even for Fourier-transformed-infrared-spectroscopy-analysers (FT-IR) it is challenging to deal with water content over 15% without increased noise. The goal

Jakubec, Philipp, Roiser, Sebastian

Optimization of a Sliding Rotary Vane Pump for Heavy Duty Internal Combustion Engine Cooling

2024-37-0030

06/12/2024

The benefits introduced by the replacement of conventional centrifugal pumps with volumetric machines for Internal Combustion Engines (ICEs) cooling were experimentally and theoretically proven in literature. Sliding Rotary Vane Pumps (SVRPs) ensure to achieve an interesting reduction of ICEs fuel consumption and CO2 emissions. Despite volumetric pumps are a reference technology for ICE lubrication oil circuits, the application in ICE cooling systems still not represent a ready-to-market solution. Particularly challenging is the case of Heavy-Duty ICEs due to the wide operating range the pump covers in terms of flow rate delivered and pressure rise. Generally, SVRPs are designed to operate at high speeds to reduce machine dimensions and, consequently, the weight. Nevertheless, speed increase could lead to a severe penalization of pump performance since the growth of the friction losses. They produce wear phenomena which require expensive surface treatments or, more generally, the

Fatigati, Fabio, Di Bartolomeo, Marco, Pallante, Francesco, Lo Biundo lng, Giuseppe, Cipollone, Roberto

The Effects of the Oil Temperature Warm-Up on Engine Fuel Consumption

2024-01-2411

04/09/2024

The need for even more efficient internal combustion engines in the road transportation sector is a mandatory step to reduce the related CO2 emissions. In fact, this sector impacts significantly on greenhouse gases worldwide, and the path toward hybrid and electric powertrains has just begun. In particular, in heavy-duty vehicles the full electrification of the powertrain is far to be considered as a really feasible alternative. So, internal combustion engines will still play a significant role in the near/medium future. Hence, technologies having a low cost to benefits (CO2 reduction) ratio will be favorably introduced in existing engines. Thermal management of engines is today a recognized area of research. Inside this area, the interest toward the lubricant oil has a great potential but not yet fully exploited. Engine oil is responsible of the mechanical efficiency of the engine which has a significant potential of improvement. A faster warm-up during a daily urban trip when the

Di Giovine, Giammarco, Di Battista, Davide, Cipollone, Roberto

A methodology for modeling the thermal behavior of an electric axle in real driving cycles

2024-01-2588

04/09/2024

The thermal behavior of the electric axle is an essential indicator which requires certain attention during the development process. Due to the complexity of heat generation mechanism and heat transfer boundary conditions, it is difficult to accurately predict the axle’s temperature, especially in real driving conditions. In this paper, a comprehensive 1D model is developed to simulate its heat transfer process effectively and accurately. The heat transfer model is developed based on the thermal network method, and the electric axle is divided into thermal mass according to its heat transfer characteristics. The heat generation model, which accounts for meshing loss, bearing loss, churning loss, and windage loss, exchanges heat flux and oil temperature information with the heat transfer model to take into account the effect of lubricating oil temperature on power loss. Meanwhile, 3D simulation is established for the lubricating oil flow inside the axle and the air flow around it, from

Hu, Xiaoyu, Shao, Hengheng, Hou, Yuanjing, Sun, Wanyu, Liu, Hongwei, Zhang, Lin

Simulation Study on the Influence of Multi-Magnetic Particles on Oil Sensor Signals

2024-01-2826

04/09/2024

Engine operation produces particles that contaminate the lubricating oil and can damage the engine's internal components. This paper presents a model for a three-coil inductive metal particle sensor and verifies the rationality and accuracy of the model by simulating the motion of a single spherical iron particle passing through the sensor. On this basis, the simulation of coupling double particles with different sizes, distances, and shapes is carried out. The study explores the influence of particle motion on the sensor-induced signal under various conditions. The research shows that when two particles pass through the sensor, the induced voltage signal will produce superposition when the distance between the two particles is small. The peak value of the induced voltage is 1-2 times the peak value of the induced voltage of a single particle. As the distance increases, the peak value of the induced voltage initially decreases, then slowly increases, and finally stabilizes. When the

Chen, Sen, Shen, Yitao, Qiang, Guiyan, Zheng, Zheng, Wang, Zheyu, Hao, Yin, Hu, Ting

Improving the Performance of Diesel Engines by Bore Profile Control under Operating Conditions

2024-01-2832

04/09/2024

The cylinder bore in an engine block is deformed under the assembling stress of the cylinder head and thermal stress. This distortion exacerbates the piston skirt friction and piston slap. Through a numerical and experimental study, this article analyzes the effect of an optimized bore profile on the engine performance. The piston skirt friction was estimated in a three-dimensional elastohydrodynamic (EHD) friction analysis. An ideal cylindrical bore under the rated load condition was assumed as the optimal bore profile that minimized the piston skirt friction without compromising the piston slap. The simulation study revealed that secondary motion of the piston immediately after firing the top dead center can be mitigated by narrowing the piston–bore clearance at the upper position of the cylinder. After optimizing the bore profile, enlarging the clearance from the middle to the lower part of the cylinder reduced the friction in the piston skirt to cylinder interface by an estimated

Hibi, Taiga, Mita, Takuro, Yamashita, Kenichi

A 3-D CFD Study of the Lubricating Oil Flow Path in a Hybrid Vehicle Transmission System

2024-01-2635

04/09/2024

Effective design of the lubrication path greatly influences the durability of any transmission system. However, it is experimentally impossible to estimate the internal distribution of the automotive transmission fluid (ATF) to different parts of the transmission system due to its structural complexities. Hybrid vehicle transmission systems usually consist of different types of bearings (ball bearings, thrust bearings, roller bearings, etc.) in conjunction with gear systems. It is a perennial challenge to computationally simulate such complicated rotating systems. Hence, one-dimensional models have been the state of the art for designing these intricate transmission systems. Though quantifiable, the 1D models still rely heavily on some testing data. Furthermore, HEVs (hybrid electric vehicles) desire a more efficient lubrication system compared to their counterparts (Internal combustion engine vehicles) to extend the range of operation on a single charge. Thus, this paper includes a

Mohapatra, Chinmoy K., Schlautman, Jeff, Liu, Zhe, Raj, Gowtham, Gao, Haiyang

Effect of Piston Secondary Motion on Lubricating Oil Consumption, Blow-by and Friction

2024-26-0259

01/16/2024

As per pieces of literature, 40 to 60 % of friction losses of Internal combustion engines occur in their piston-piston rings-liner assemblies and, there is a significant supportive role of simulation in improving this assembly. Literature is also available which tells, how changes in pistons affect oil consumption. Thus, piston dynamics is also important for oil consumption. Furthermore, the results from the simulation module of piston movement also serve as a significant input for postprocessing to calculate piston ring dynamics. This research is conducted to understand the piston secondary motion effect on oil consumption, friction, and blow-by. In this work, the results of ring dynamics and oil consumption simulation modules are studied with consideration and non-consideration of piston secondary motion results. The results like minimum oil film thickness, lubricating oil consumption, friction, friction power loss, and blow-by are investigated. Results indicate that oil throw-off

Sanadhya, Kunjan, Nandgaonkar, M., Aghav, Yogesh

Conversion of Diesel Fuel System to CNG Fuel System for Commercial Vehicles

2024-26-0382

01/16/2024

CNG fuel has recently gained popularity in passenger and commercial vehicles due to its lower cost of operation compared to gasoline and diesel. It is also a more environmentally friendly fuel than other fuels. Converting a customer vehicle with a Diesel option to a CNG option is more difficult than building a new CNG vehicle. In this we are outlining the design of CNG fuel systems and the challenges of replacing them during the transition from Diesel to CNG and qualifying the Government Norms for running the vehicle will increase the life as well as make our environment more eco-friendly than diesel vehicles. Using CNG as a fuel in the automotive industry gives benefits over Gasoline & Diesel • increased life of lubricating oils, as CNG does not contaminate and dilute the crankcase oil. • Lower cost of per unit energy. • Being a gaseous fuel, CNG mixes easily and evenly in air, hence less hazardous. • CNG is less likely to touch off on hot surfaces since it includes a tall auto

Srivastava, Rajat, Sharma, Mukesh, Kumar, Satish, Sharma, Pawan, Singh, Gaurav

Optimization of Oil Quantity in Manual Transmission and Reducing Churning Loss

2024-26-0346

01/16/2024

The gearbox is a crucial aggregate in a diesel truck. Gearboxes must work efficiently to get the job done properly and lubrication is vital to this efficiency. Lubricating oil is like the circulation system of a gearbox. If the oil levels fall too low, the gearbox will likely fail. Gearbox failure can lead to expensive repairs that could be prevented. Besides added costs due to replacement or repair, costs associated with a loss of production could be significant. These issues are why; it is important to understand the consequences of having low lubricant levels. Similarly, higher oil level creates higher churning losses, heating of the Gear oil and oxidation, reduction in efficiency and increased oil leaks. Understanding the functions of gearbox lubricating oil can help you choose the right quantity of prevent gearbox failures. The aim of the testing is to find the accurate level of oil required to lubricate the Gearbox properly without failure and to reduce from the current predicted

Lakshamanan, Sundar, Ks, Dhianeshwar, G R, Santosh, Ramaswamy, Sarathkumar

Lubrication Evaluation of EV Transmission

2024-26-0328

01/16/2024

Advent of EV powertrain has considerable effect on transmission development activities as competed to regular ICE transmission. Conventional ICE transmission and the transmission for an e-powertrain differ on fundamental level. The conventional transmission has number of gear ratios, shift mechanism which enables the transmission to deliver a smooth power output as per demand from the driver. Whereas the e-powertrain transmission is mostly a single gear ratio transmission (reducer) which primarily depends on speed and torque variation from the motor to cater the driver requirement. Hence, the operating speeds of such e-transmissions can vary from 0 to 20000 rpm in both forward and reverse directions. Such a large speed variation as compared with conventional transmission calls for special attention towards the lubrication of internal components. High speeds and lower oil viscosities tend to disrupt the oil films in between contact surfaces causing metal to metal contact. This situation

Kushwaha, Rakesh, Bhosale, Vikas, Navale, Pradeep, Patel, Hiral

A Study of Engine Oil Aeration in IC Engines and Factors Contributing

2024-26-0370

01/16/2024

The lubrication system of an internal combustion engine is a crucial component that performs a variety of functions, including lowering friction, cooling, supporting the load, and cleaning debris from the engine’s various moving components. Oil aeration refers to the phenomenon of trapping air bubbles in lubricating oil. High oil aeration can have a detrimental effect on engine performance since modern engines are equipped with parts such as VVT, HLA, RFF, PCJ, LCJ, and other components; whose operation is substantially impacted by the amount of air in circulating oil. In this study, an Inline 4-cylinder NA DOHC gasoline engine was tested with a densimeter-type aeration measuring machine. Test equipment layout which consists of hoses of various diameters and lengths were designed, fabricated, and instrumented to operate under different test conditions. Visual observations and quantitative measurements of oil aeration were performed in the oil sump. The purpose of this study is to

Attri, Mayank, Yadav, Vimal, Kamboj, Jagdish

Research on the Secondary Motion of Engine Piston Considering the Transport of Lubricating Oil

03-17-03-0024

11/21/2023

At present, it is generally considered in the analysis of the secondary motion of engine piston that the piston skirt–cylinder liner friction pair is fully lubricated in an engine operating cycle. However, in practice, when the piston moves upward, the amount of lubricating oil at the inlet may not ensure that the friction pair is fully lubricated. In this article, the secondary motion of piston is studied when the transport of lubricating oil is considered to determine the lubrication condition of piston skirt–cylinder liner friction pair. The secondary motion of piston is solved based on the combined piston motion model, hydrodynamic lubrication model, asperity contact model, and lubricating oil flow model. The secondary motion equation of piston is solved by the Broyden method. The hydrodynamic lubrication equation is solved by the finite difference method. The asperity contact between piston skirt and cylinder liner is calculated by the Greenwood model. The flow of lubricating oil

Liu, Jihai, Sun, Jun

Improving the Gearbox Efficiency by Reducing Drag Loss IN Automotive Manual Transmission

2023-28-0115

11/10/2023

Internal combustion engine vehicles are major contributors to many environmental and health hazardous emissions and sometimes consume more fuel. New regulations like Corporate Average Fuel Efficiency (CAFÉ) norms are coming up and demand lower emissions. Original Equipment Manufacturers (OEMs) are committed to bringing various technological advancements in Internal Combustion Engine (ICE)powered vehicles to maximize their efficiency. Hence it is important to reduce the loss and improve the fuel economy. This paper explains a new approach methodology used for reducing the gearbox drag by 5- 10 %. This improvement can significantly contribute to the overall efficiency improvement thus carbon footprints of vehicle getting reduced. The following optimization areas are considered for such improvements, 1 Deflector @ various locations 2 Lubrication oil viscosity change 3 Preload optimized for the benefit of the power/drag loss, 4 Oil quantity changes to improve the power loss 5 Top cover

Senthil Raja, T., K, Barathi Raja, Kumar, Aneesh

The Effect of Sulfated Ash Content in Lubricant Oil on Particulate Emission of Gasoline Engine

2023-01-1647

10/31/2023

On a 1.5L TGDI gasoline engine bench(without GPF), 4 lubricant oils A/B/C/D with different sulfated ash content (1.1wt.%/0.8wt.%/0.7wt.%/0.5wt.%) were used to test the impact on the emission of PN and PM under WLTC condition. In the test results, the PN and PM values of Oil A are the largest, 7.12E+12 p/km and 2.60mg/km respectively, the PN and PM values of Oil B and C are the equivalent, 5.58E+12 p/km&5.72E+12 p/km,1.81 mg/km & 2.03 mg/km respectively, and the PN and PM values of Oil D are 5.38E+12 p/km and 1.65mg/km respectively. The test results indicate that the sulfated ash content of engine oil affects the particulate emission level of the engine. Oil with high sulfated ash content(1.1 wt.%) has high emission values(PN&PM); Oils with low sulfated ash content (0.8wt.%) have lower emission values (PN&PM). When the sulfated ash content of the oil is below 0.8wt.%, there is almost no significant difference in emission values (PN&PM

Ling, Lei, Sun, Ruiyu, Xu, Jinshan

Using Analysis of the Ring Pack and Piston to Optimize Oil Consumption of Current and Future Engines

2023-01-1603

10/31/2023

Engine manufacturers are increasingly concerned about oil consumption due to its implications for operating costs, emissions, and durability in both diesel and natural gas-powered engines. As future engines aim for low or near-zero emissions while utilizing low/zero carbon fuels, lubricant oil consumption will play a critical role in achieving decarbonization and emissions targets. Hydrogen-fuelled engines, in particular, will be more vulnerable to oil droplet and oil ash-based pre-ignition. Traditionally, the influence of key design parameters on oil consumption has been determined during the validation phase of an engine development program, which entails extensive testbed hours and time-consuming hardware iterations. As a result, development programs may be unable to optimize oil consumption due to cost and time constraints. The need to reduce oil consumption, along with these constraints, has prompted the adoption of more efficient development approaches, such as using virtual

Jay, Alastair, Ballard, Helen, Ocerin Meñica, Olatz, Larralde Yoller, Aitor, Barcena Ortiz de Urbina, Javier

Elastomer: Fluorosilicone Rubber (FVMQ), Fuel and Oil Resistant, High Strength, 45 – 55 Shore A Hardness, For Products in Fuel Systems / Lubricating Oils

AMS3329D (Current)

10/16/2023

This specification covers a high strength fluorosilicone (FVMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used for molded rings, compression seals, molded O-ring cord, and molded in place gaskets for aeronautical and aerospace applications

AMS CE Elastomers Committee

Clarification of Fuel and Oil Flow Behaviour Around the Piston Rings of Internal Combustion Engines: Visualization of Oil and Fuel Behaviour by Photochromism in Gasoline Engine Under Transient Operating Conditions

2023-32-0046

09/29/2023

Photochromism is a reversible color change phenomenon based on chemical reactions caused by light illumination. In the present study, this technique is applied to visualize the lubricating oil and fuel around the piston rings in the gasoline engine. The oil film was colored with a UV laser and photographed by synchronizing the shutter of a high-speed camera with a flashlight. The color density was evaluated as a value of absorbance, calculated from images taken at two different wavelengths and two different times before and after the coloration. The authors performed photochromism visualization experiments in an engine under motored operation. However, using photochromic dyes that are robust to temperature changes makes it possible to visualize the engine under fired operation. The experiment was conducted mainly by switching to the motored operation for a fixed time between the fired operations. The visualization results showed that during the motored operation, lubricating oil

Kawamoto, Yuki, Inoue, Naoki, Ito, Yuto, Azetsu, Akihiko, Takahashi, Shun, Ochiai, Masayuki, Stark, Michael, Härtl, Martin, Jaensch, Malte, Preuss, Ann-Christin, Pryymak, Konstantin, Matz, Gerhard

Clarification of Fuel and Oil Flow Behavior Around the Piston Rings of Internal Combustion Engines – Simultaneous Analysis of Oil Flow Behavior and Oil Emissions During Transient Operation

2023-32-0045

09/29/2023

Future demands for modern emission free drivetrains using hydrogen or liquid e-fuels also necessitate a fundamental reduction in oil emissions. Entry of lubrication oil into the combustion chamber can lead to pre-combustion phenomena (LSPI) in downsizing or hydrogen engines and is a cause of particle emissions, which play a significant role especially if fuel related particle emissions are already low. A fundamental understanding of the oil film behavior on the piston assembly and cylinder liner surface are crucial to avoid oil ingress into the combustion chamber. The processes involved take place mainly around the piston group. In particular, the area of the piston rings with the prevailing pressure and temperature conditions as well as the component geometries has a high influence on the exchange of media between the crankcase and combustion chamber. The objective of this paper is to increase the understanding of the processes leading to oil ingress into the combustion chamber. In

Stark, Michael, Härtl, Martin, Jaensch, Malte, Preuss, Ann-Christin, Pryymak, Konstantin, Matz, Gerhard, Gohl, Marcus

Mechanism of Thicker Oil Film Formation Caused by Micro-Dimples Elucidated by Direct Observation with Laser-Induced Fluorescence

2023-32-0139

09/29/2023

Micro-dimple is one of the promising surface texturing technologies to reduce friction loss due to the generation of thicker oil film caused by the cavitation occurrence around the micro-dimples. In this study, the flow behavior of oil film around micro-dimples was directly observed by laser-induced fluorescence (LIF). LIF observation for the oil flow showed that micro- dimples induced the cavitation occurrence that contributed to increase the oil film thickness. This was in good agreement with the results of the friction test, and it was thus proved that the cavitation occurrence by micro-dimples is significantly effective for the friction reduction

Sakai, Masanori, Hirayama, Tomoko, Yamashita, Naoki, Hatano, Naoya, Tatsumi, Kazuya, Fujita, Hideyuki, Kuragaki, Naoyoshi

Drivetrain Lubricants with Efficiency-Boosting Properties For Electric Vehicles

2023-32-0143

09/29/2023

In electric vehicles (EVs), drivetrain lubricants are often utilized not only as a lubricating oil for the drivetrains but also for motor cooling. As such, they are required to both improve the efficiency of the drivetrains and to have a high cooling performance. Both requirements can be met by lowering the viscosity of the fluid, which effectively improves the heat transfer coefficient, reduces churning loss, and improves efficiency. However, low viscosity may adversely affect the fatigue life of gears and bearings. To address these issues, we used a high-performance base oil and optimized additives (e.g., anti-wear agents) to develop a fluid with higher lubricity than conventional automatic transmission fluid (ATF), even though its viscosity is lower. The 100,000-kilometer (WLTC mode) endurance test on an actual vehicle confirmed that there was no damage in the reduction gear unit parts. We also evaluated the torque loss on the reduction gear unit and fuel consumption and confirmed a

Matsui, Noriyuki, Matsuki, Shingo, Iino, Mari, Akiguchi, Junnosuke, Itou, Kimikazu, Saitou, Tomohito

Investigation of Exhaust Particles on Different TEM Grids: a Comparison between Graphene Oxide and Silicon Nitride Grids

2023-32-0123

09/29/2023

Two different TEM (Transmission Electron Microscopy) grids - graphene oxide (GO) and silicon nitride (SiN) - were used to capture the particulates emitted with the exhaust of a modern 1.0 L GDI (Gasoline Direct Injection) engine. One speed-load condition (1250 rpm – idle) was chosen to generate a nanometric particulate output in the sub-23 nm regime which has been traditionally difficult to analyse in terms of composition and morphology. The overall aim was to understand if additional benefits can be obtained by analysing the particles captured in the exhaust on a nanoporous silicon nitride grid compared to state-of- the-art graphene oxide grids. The behaviour of porous SiN support films was of interest since nanopores are present in the grid in the 20 nm regime and the material is thermally and dimensionally stable under high temperatures, allowing thermophoretic capture directly within the engine exhaust stream. In addition to nanostructural and morphological comparison, the

Lagana, Salvatore, Akifjevs, Romans, Rocca, Antonino La, Cairns, Alasdair, Fay, Michael W., Webb, Kevin F.

Modeling of piston pin rotation in a large bore gas engine

2023-32-0161

09/29/2023

In an engine system, the piston pin is subjected to high loading and severe lubrication conditions, and pin seizures still occur during new engine development. A better understanding of the lubricating oil behavior and the dynamics of the piston pin could lead to cost- effective solutions to mitigate these problems. However, research in this area is still limited due to the complexity of the lubrication and the pin dynamics. In this work, a numerical model that considers structure deformation and oil cavitation was developed to investigate the lubrication and dynamics of the piston pin. The model combines multi-body dynamics and elasto-hydrodynamic lubrication. A routine was established for generating and processing compliance matrices and further optimized to reduce computation time and improve the convergence of the equations. A simple built-in wear model was used to modify the pin bore and small end profiles based on the asperity contact pressures. The model was then applied to a

Shu, Zhiyuan, Tian, Tian, Meng, Zhen, Fiedler, Rolf-Gerhard, Berbig, Frank

Digital High-Speed Photography of Cavitation in Journal Bearings

2023-32-0163

09/29/2023

This paper presents current research comparing gaseous and vaporous cavitation in lubricant flows obtained by means of digital high-speed photography in un-precedented detail. Hydrodynamic journal bearings are compact and guarantee a nearly wear- resistant operation. These features make journal bearings the first choice for many applications. However, under particular operational conditions, e.g. a highly dynamic load, cavitation can occur which can lead to bearing failures. For the selected case of suction cavitation these conditions are characterized by high eccentricity combined with a rapid variation of the lubricating film thickness. The work at hand presents a new experimental approach to study suction cavitation in a scaled bearing model. Moreover, mechanical and fluid dynamic similarity laws are described which enable the transfer of bearing operation conditions into the model experiment and vice versa. An extensive literature research yields the parameters of operating

Reinke, Peter, Rienaecker, Adrian, Schmidt, Marcus, Beckmann, Tom

Investigating the morphology and nanostructure of carbon black dispersed in lubricant oils and their impact on chain wear as a proxy of marginally lubricated components

2023-32-0116

09/29/2023

Excessive soot concentration in the lubricant promotes excessive wear on timing chains. The relationship between chain wear and soot concentration, morphology, and nanostructure, however, remains inconclusive. In this work, a chain wear test rig is used to motor a 1.3 L diesel engine following the speed profile of a Worldwide Harmonized Light Vehicle Test Cycle (WLTC). The lubricant oil was loaded with 3% carbon black of known morphology. The chain length is measured at regular intervals of 20 WLTC cycles (i.e. 10 hours) and the wear is expressed as a percentage of total elongation. Oil samples were collected and analysed with the same frequency as the chain measurements. Carbon black morphology and nanostructure were investigated using Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM). DLS data revealed carbon black particle size did not change substantially in the first 10 hours, however, during the remaining test cycles a reduction in agglomerates size over

Pacino, A., La Rocca, A., Kirkby, T., Reddyhoff, T., Cairns, A., Smith, J., Berryman, J., Fowell, M.

Effect of Viscosity Characteristics of Lubricants for Electric Vehicles on Thermal Conductivity and Gear Protection

2023-32-0144

09/29/2023

The purpose of this study is to investigate how the kinematic viscosity of lubricating oil used in hybrid electric vehicle (HEV) and electric vehicles (EV) transaxles affects thermal conductivity and gear seizure resistance. This study investigated the relationship between viscosity, thermal conductivity and gear seizure resistance in detail and found that thermal conductivity tends to decrease with decreasing viscosity. It was also found that the thermal conductivity decreases significantly after a certain viscosity. The relationship between viscosity and gear seizure resistance was also investigated and it was found that too low a viscosity causes a significant deterioration in gear seizure resistance

Matsubara, Kazushige, Tatsumi, Hiroyuki, Nakahara, Yasuhito, Takekawa, Daisuke, Narita, Keiichi

100 Years of Corrosion Testing—Is It Time to Move beyond the ASTM D130? The Wire Corrosion and Conductive Deposit Tests

04-17-01-0002

09/22/2023

The ASTM D130 was first issued in 1922 as a tentative standard for the detection of corrosive sulfur in gasoline. A clean copper strip was immersed in a sample of gasoline for three hours at 50°C with any corrosion or discoloration taken to indicate the presence of corrosive sulfur. Since that time, the method has undergone many revisions and has been applied to many petroleum products. Today, the ASTM D130 standard is the leading method used to determine the corrosiveness of various fuels, lubricants, and other hydrocarbon-based solutions to copper. The end-of-test strips are ranked using the ASTM Copper Strip Corrosion Standard Adjunct, a colored reproduction of copper strips characteristic of various degrees of sulfur-induced tarnish and corrosion, first introduced in 1954. This pragmatic approach to assessing potential corrosion concerns with copper hardware has served various industries well for a century. Driveline lubricants have always been required to protect hardware, and

Hunt, Gregory J., Choo, Lindsey, Newcomb, Timothy

A Numerical Methodology to Test the Lubricant Oil Evaporation and Its Thermal Management-Related Properties Derating in Hydrogen-Fueled Engines

03-17-02-0015

09/15/2023

Due to the incoming phase out of fossil fuels from the market in order to reduce the carbon footprint of the automotive sector, hydrogen-fueled engines are candidate mid-term solution. Thanks to its properties, hydrogen promotes flames that poorly suffer from the quenching effects toward the engine walls. Thus, emphasis must be posed on the heat-up of the oil layer that wets the cylinder liner in hydrogen-fueled engines. It is known that motor oils are complex mixtures of a number of mainly heavy hydrocarbons (HCs); however, their composition is not known a priori. Simulation tools that can support the early development steps of those engines must be provided with oil composition and properties at operation-like conditions. The authors propose a statistical inference-based optimization approach for identifying oil surrogate multicomponent mixtures. The algorithm is implemented in Python and relies on the Bayesian optimization technique. As a benchmark, the surrogate for the SAE5W30

De Renzis, Edoardo, Mariani, Valerio, Bianchi, Gian Marco, Cazzoli, Giulio, Falfari, Stefania

Experimental Investigation on a DI Diesel Engine Fuelled with Diesel-Like Fuel Obtained by Waste Lubricant Oil Pyrolysis

2023-24-0050

08/28/2023

In the last decades, waste lubricating oil (WLO) has attracted a great attention due to its strong effect on the environment degradation. Due to the high content of hydrocarbons in the WLO, these huge quantities could be interesting for recovery as a fuel for internal combustion engines. In the present work, an experimental study is conducted on a DI diesel engine operating with a diesel-like fuel (DLF) obtained by converting WLO via a catalytic pyrolysis process. The DLF physicochemical properties have shown a good agreement with those of diesel fuel, except for the viscosity which is slightly higher than that the values recommended by the international standards. For the engine tests, a single cylinder DI diesel engine, operating at a constant speed (1500 rpm) and under various engine load conditions, is fuelled with either DLF or its blends supplemented with various diesel fuel ratios (10, 20 and 30 % by volume). The combustion parameters, engine performance and its exhaust

Tarabet, Lyes

Indirect Assessment of Isentropic Efficiency in Turbocharger Turbines via Mechanical Efficiency Evaluation under Quasi-Adiabatic Test

2023-24-0121

08/28/2023

The isentropic efficiency estimation of small radial turbines is an important aspect of turbocharger performance evaluation. Because of inaccuracies in measuring the outlet temperature due to the non-homogeneous flow field distribution, it is common practice to refer to the thermomechanical efficiency, defined as the product of mechanical and turbine isentropic efficiencies. This paper proposes a method for the indirect evaluation of turbine isentropic efficiency through specific experimental tests. In particular, the evaluation of friction losses in the bearings can be assessed thanks to experimental investigations in quasi-adiabatic condition. By maintaining the turbine inlet temperature and the average temperature of lubricating oil and water-cooling circuit equal to the compressor outlet temperature, a negligible heat transfer between turbine and compressor can be achieved. Therefore, the heat transferred to the lubricating oil can only be attributed to the friction in the bearings

Cordalonga, Carla, Marelli, Silvia, Usai, Vittorio, Capobianco, Massimo

Application of a One-Dimensional Dilution and Evaporation Lubricant Oil Model to Predict Oil Evaporation under Different Engine Operative Conditions Considering a Large Hydrogen-Fuelled Engine

2023-24-0009

08/28/2023

The increasing environmental concern is leading to the need for innovation in the field of internal combustion engines, in order to reduce the carbon footprint. In this context, hydrogen is a possible mid-term solution to be used both in conventional-like internal combustion engines and in fuel cells (for hybridization purposes), thus, hydrogen combustion characteristics must be considered. In particular, the flame of a hydrogen combustion is less subjected to the quenching effect caused by the engine walls in the combustion chamber. Thus, the significant heating up of the thin lubricant layer upon the cylinder liner may lead to its evaporation, possibly and negatively affecting the combustion process, soot production. The authors propose an analysis which aims to address the behavior of different typical engine oils, (SAE0W30, SAE5W30, SAE5W40) under engine thermo-physical conditions considering a large hydrogen-fuelled engine. The operative conditions are obtained by means of

De Renzis, Edoardo, Mariani, Valerio, Bianchi, Gian Marco, Falfari, Stefania, Cazzoli, Giulio

Elastomer: Fluorosilicone (FVMQ) Rubber Fuel and Oil Resistant 45 - 55 Shore A Hardness For Products in Fuel Systems/Lubricating Oils

AMS3330D (Current)

08/16/2023

This specification covers a fluorosilicone (FVMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used for molded rings, compression seals, molded O-ring cord, and molded in place gaskets for aeronautical and aerospace applications

AMS CE Elastomers Committee

O-RING MOLDED FROM AMS7379 FLUOROCARBON (FKM) MATERIAL

AS5729B (Current)

06/06/2023

THIS STANDARD ESTABLISHES THE DIMENSIONAL AND VISUAL QUALITY REQUIREMENTS, LOT REQUIREMENTS AND PACKAGING AND LABELING REQUIREMENTS FOR O-RINGS MOLDED FROM AMS7379 FLUOROCARBON (FKM) RUBBER. IT SHALL BE USED FOR PROCUREMENT PURPOSES

A-6C2 Seals Committee

Compatibility of Turbine Lubricating Oils

ARP7120 (Current)

05/01/2023

This method is used for determining the compatibility of a candidate lubricant with specific reference lubricants. The reference lubricants to be used will typically be mandated by the owner of the product specification against which the candidate lubricant is being compared. This method is split into two procedures (Procedure A and Procedure B) with a summary of each procedure contained in Section 4

E-34 Propulsion Lubricants Committee

Deep Generative Networks for Nondestructive Cylinder Liner Inspection in Large Internal Combustion Engines

2023-01-0066

04/11/2023

Digitalization offers a variety of promising tools for improving large internal combustion engine technology. This also includes the inspection of important engine components such as cylinder liners. Modern concepts for condition monitoring of the inner surfaces of cylinder liners are often based on indirect methods such as lubricating oil or vibration condition monitoring. However, a position-based inspection of roughness and lubrication properties of the liner surface is currently not possible during operation, nor is it feasible during engine standstill. For large engines in particular, the evaluation of surface properties currently requires disassembly and cutting of the inspected liner, followed by a sophisticated microscopic surface depth measurement. Although this process provides a high-resolution three-dimensional surface model, such measurement methods are destructive and costly. The goal of the research presented here is to develop a simpler and nondestructive method for

Angermann, Christoph, Laubichler, Christian, Kiesling, Constantin, Dreier, Florian, Haltmeier, Markus, Jonsson, Steinbjörn

Study of Flashing Flows Entering Evacuated Sampling Cylinders for Oil Circulation Rate Measurement in an Automotive Air Conditioning System

2023-01-0140

04/11/2023

The oil circulation rate (OCR) is a deciding factor for the performance of automotive air conditioning systems at both the system and component levels. OCR is defined as the percentage by mass of oil present in a representative sample of oil-refrigerant mixture drawn from the system at steady state. In recent years, many industries are opting for low-OCR compressors, and so the OCR values are getting smaller, making it even more important to be able to accurately measure the OCR in the system. All the different OCR measurement techniques rely on the ASHRAE Standard 41.4 for proper calibration. This standard describes OCR measurement using a sampling technique which involves connecting an evacuated sampling cylinder at the liquid line of the system at steady state to draw a sample containing the liquid mixture of refrigerant and oil. However, several factors such as orientation of sampling cylinder and valve opening speed can affect the OCR results. The flow entering the sampling

Haider, Syed Angkan, Wang, Xin, Elbel, Stefan

Diesel Particulate Filter Durability Performance Comparison Using Metals Doped B20 vs. Conventional Diesel Part II: Chemical and Microscopic Characterization of Aged DPFs

2023-01-0296

04/11/2023

This project’s objective was to generate experimental data to evaluate the impact of metals doped B20 on diesel particle filter (DPF) ash loading and performance compared to that of conventional petrodiesel. The effect of metals doped B20 vs. conventional diesel on a DPF was quantified in a laboratory controlled accelerated ash loading study. The ash loading was conducted on two DPFs – one using ULSD fuel and the other on B20 containing metals dopants equivalent to 4 ppm B100 total metals. Engine oil consumption and B20 metals levels were accelerated by a factor of 5, with DPFs loaded to 30 g/L of ash. Details of the ash loading experiment and on-engine DPF performance evaluations are presented in the companion paper (Part I). The DPFs were cleaned, and ash samples were taken from the cleaned material. X-ray Fluorescence (XRF), X-Ray Photoelectron Spectroscopy (XPS) and X-Ray Diffraction (XRD) were conducted on the ash samples. Core samples were taken from the cleaned DPF and were

Lakkireddy, Venkata, McCormick, Robert L., Weber, Phillip, Howell, Steve

Diesel Particulate Filter Durability Performance Comparison Using Metals Doped B20 vs. Conventional Diesel Part I: Accelerated Ash Loading and DPF Performance Evaluation

2023-01-0297

04/11/2023

The project objective was to generate experimental data to evaluate the impact of metals doped B20 on DPF ash loading and performance compared to that of conventional petrodiesel. Accelerated ash loading was conducted on two DPFs – one exposed to regular diesel fuel and the other to B20 containing metal dopants equivalent to 4 ppm B100 total metals (currently total metals are limited to 10 ppm in ASTM D6751, the standard for B100). Periodic performance evaluations were conducted on the DPFs at 10 g/L ash loading intervals. After the evaluations at 30 g/L, the DPF was cleaned with a commercial DPF cleaning machine and another round of DPF evaluations were conducted. A comparison of the effect of ash loading with the two fuels and DPF cleaning is presented. The metals doped B20 fuel resulted in ash that was similar to that deposited when exposed to ULSD (lube oil ash) and exhibited similar ash cleaning removal efficiency. Metals doped B20 resulted in faster ash accumulation within the

Lakkireddy, Venkata, McCormick, Robert L., Weber, Phillip, Howell, Steve

Optimization Design and Performance Verification of the Second Generation Single Motor Plug-in Hybrid System (EDU) of SAIC Motor Vehicle Company

2023-01-0446

04/11/2023

SEAT Department of SAIC Motor Vehicle Company starts innovatively applying the single motor and P2.5 configuration scheme from EDU G2(Electric Drive Unit Generation 2), which consists of six engine gears and four motor gears. EDU G2 is very compact and adaptable through the coupling design. Gear coupling make the engine and motor coordination limited, so as to the high efficiency zone of the engine and the high efficiency zone of the motor cannot match in some working conditions, which affect the performance of the vehicle. Therefore, SEAT developed the second generation of single-motor plug-in hybrid system EDU G2 Plus EDU G2(Electric Drive Unit Generation 2 Plus), which realized the decoupling design of 5 engine gears and 2 motor gears, so that the power output of engine and motor is freely. With excellent power and economic performance, the vehicle has been well received by customers. The article mainly describes the system design and development on the themes of motor performance

ge, Hailong, Zhao, Zhiguo

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