Your Selections

Lubricating oils
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

 

Experimental High Temperature Analysis of a Low-Pressure Diesel Spray for DPF Regeneration

Continental Automotive Systems US Inc-Nic Van Vuuren
Universita degli Studi di Perugia-Lucio Postrioti, Gabriele Brizi
  • Technical Paper
  • 2019-24-0035
To be published on 2019-08-15 by SAE International in United States
In the current automotive scenario, particulate filter technology is mandatory in order to attain emission limits in terms of particulate matter for Diesel engines. Despite DPF is often considered a mature technology, significant issues can derive from the use of the engine fuel injectors to introduce in the exhaust pipe the fuel needed to light on the particulate matter in the filter during its regeneration, primarily the lubricant oil dilution with fuel a consequence of significant spray impact on the cylinder liner. As an alternative, the fuel required to start regeneration can be introduced in the exhaust pipe by an auxiliary low pressure injector spraying in the hot exhaust gas stream. In this conditions, the spray evolution and its possible interaction with the surrounding gas stream are relevant in order to better identify the overall layout of the system, so to have the fuel vaporized at the DPF inlet section. In the present paper, a detailed spray analysis a low pressure Diesel spray evolving in a pressurized, high temperature vessel is described; the vessel pressure…
 

Analysis of the emission conversion performance of gasoline particulate filters and four-way catalysts over lifetime

Corning GmbH-Dominik Rose, Thorsten Boger
FEV Europe GmbH-Christof Schernus, Michael Görgen, Jim Cox, Martin Nijs, Johannes Scharf
  • Technical Paper
  • 2019-24-0156
To be published on 2019-08-15 by SAE International in United States
Gasoline particulate filters (GPF) recently entered the market, and are already regarded a state-of-the-art solution for gasoline exhaust aftertreatment systems to enable EU6d-TEMP fulfilment and beyond. Due to their rapid market introduction, extensive field experience with GPFs is not yet available. Especially for four-way catalytic converters, the prognosis of the emission conversion performance over lifetime poses an ambitious challenge, which significantly influences future catalyst diagnosis calibrations. In the first part of the paper, experimental GPF ash loading results are presented. Since most of the ash accumulated in the filter results from the combustion of lubricating oil additives, a burner test bench with a purpose-designed oil injection system was chosen for the investigations. The analysis of the backpressure results show that, contrary to high soot loadings, the ash load has a relatively low impact on engine performance and fuel consumption. Regarding the filtration efficiency over time, there is discrepancy between the results obtained during a “COP” (conformity of production) test and the measured values after a run-in mileage of 3,000 km that is required for the…
 

Coupling Assemblies, Quick Disconnect, Automatic Shutoff

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS7413A
  • Current
Published 2019-04-23 by SAE International in United States
This specification establishes requirements for automatic shutoff, quick-disconnect coupling assemblies for fuel and oil lines.
Datasets icon
Annotation icon
 

Elastomer: Silicone, Rubber (MQ/VMQ) General Purpose 65 – 75 Durometer Type ‘A’ Hardness

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3304J
  • Current
Published 2019-04-05 by SAE International in United States
This specification covers a silicone (MQ/VMQ) 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, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications, AMS7268 should be used.
Datasets icon
Annotation icon
 

Elastomer: Silicone Rubber, (VMQ) General Purpose 75 – 85 Durometer Type ‘A’ Hardness

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3305K
  • Current
Published 2019-04-05 by SAE International in United States
This specification covers a silicone (MQ/VMQ) 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, O-ring cord, and molded in place gaskets for aeronautical and aerospace applications without complete consideration of the end use prior to the selection of this material.
Datasets icon
Annotation icon
 

Some Experimental Studies on the Use of Tyre Pyrolysis Oil (TPO) in an Agricultural Diesel Engine

CASRAE, Delhi Technological University-Naveen Kumar
Maharaja Agrasen Institute of Technology-Ashwni Goyal
Published 2019-04-02 by SAE International in United States
Globally, the demand for energy is increasing due to both increase in population and enhancement in the lifestyle of people. Most of the energy demand at present is met from fossil fuels, which are not only exhaustible but also a threat to the environment. Various routes of sustainable energy resources are being explored to address the above-mentioned issues and fuel made from used tyre may be one of the promising options.India is one of the fastest growing economies and every year 10 million new vehicles are registered. Due to poor road conditions, nearly fourfold tyres of this number are dumped as waste. This large stock of dumped tyres are non-biodegradable and creates other problems like a breeding site for mosquitos, or source of pollution in case of accidental fire. In order to cope with the large pile-up of used tyres, pyrolysis of these tyres could be a sustainable route. Pyrolysis is a thermo-chemical process carried in absence of oxygen and a sustainable option for conversion into Tyre Pyrolysis Oil (TPO).In the present work, the performance…
Datasets icon
Annotation icon
 

Variable Compression Ratio (VCR) Piston - Design Study

King Abdullah University of Science & Technology-Hao Shi, Sultan Al Mudraa, Bengt Johansson
Published 2019-04-02 by SAE International in United States
Variable compression ratio (VCR) technology has long been recognized as a method for improving the automobile engine performance, efficiency, fuel economy with reduced emission. This paper presents a design of hydraulically actuated piston based on the VCR piston proposed by the British Internal Combustion Engine Research Institute (BICERI). In this design, the compression height of the piston automatically changes in response to engine cylinder pressure by controlling the lubrication oil flow via valves in the piston. In addition, numerical models including piston kinetic model, oil hydraulic model, compression ratio model and etc., have been established to evaluate the piston properties. The oil flow characteristics between two chambers in VCR piston have been investigated and the response behaviors of VCR engine and normal engine, such as compression pressure and peak cylinder pressure, are compared at different engine loads. Moreover, the energy losses because of VCR piston vibration at high engine loads in firing cycles have been calculated. According to the analysis results, both of energy loss and related percentage in piston work output rise with engine…
Datasets icon
Annotation icon
 

Modeling of Oil Transport between Piston Skirt and Cylinder Liner in Internal Combustion Engines

Massachusetts Institute of Technology-Zhen Meng, Sebastian Ahling, Tian Tian
Published 2019-04-02 by SAE International in United States
The distribution of lubricating oil plays a critical role in determining the friction between piston skirt and cylinder liner, which is one of the major contributors to the total friction loss in internal combustion engines. In this work, based upon the experimental observation an existing model for the piston secondary motion and skirt lubrication was improved with a physics-based model describing the oil film separation from full film to partial film. Then the model was applied to a modern turbo-charged SI engine. The piston-skirt FMEP predicted by the model decreased with larger installation clearance, which was also observed from the measurements using IMEP method at the rated. It was found that the main period of the cycle exhibiting friction reduction is in the expansion stroke when the skirt only contacts the thrust side for all tested installation clearances. The main reason for lower skirt friction with larger clearance is greater amount of oil available during the expansion stroke.
Datasets icon
Annotation icon
 

The Thermodynamic Design, Analysis and Test of Cummins’ Supertruck 2 50% Brake Thermal Efficiency Engine System

Cummins Inc.-Daniel Mohr, Timothy Shipp, Xueting Lu
Published 2019-04-02 by SAE International in United States
Current production heavy duty diesel engines have a brake thermal efficiency (BTE) between 43-46% [1]. In partnership with the United States Department of Energy (DOE) as part of the Supertruck 2 program, Cummins has undertaken a research program to develop a new heavy-duty diesel engine designed to deliver greater than 50% BTE without the use of waste heat recovery. A system level optimization focused on: increased compression ratio, higher injection rate, carefully matched highly efficient turbocharging, variable lube oil pump, variable cooling components, and low restriction after treatment designed to deliver 50% BTE at a target development point. This work will also illustrate the system level planning and understanding of interactions required to allow that same 50% BTE heavy duty diesel engine to be integrated with a waste heat recovery (WHR) system to deliver system level efficiency of 55% BTE at a single point. In addition to a test bench demonstration, the described system is also planned to be demonstrated at a vehicle system level. This paper summarizes the process and results of the 50%…
Annotation icon
 

Investigation on Ignition of a Single Lubricating Oil Droplet in Premixed Combustible Mixture at Engine-Relevant Conditions

Tsinghua University-Shubo Fei, Zhi Wang, Yunliang Qi, Yingdi Wang
Published 2019-04-02 by SAE International in United States
The ignition of lubricating oil droplet has been proved to be the main factor for pre-ignition and the following super-knock in turbocharged gasoline direct injection engine. In this paper, the ignition process of lubricating oil droplet in combustible ambient gaseous mixture was investigated in a rapid compression machine (RCM). The pre-ignition induction by oil droplet of the ambient gaseous mixture was analyzed under different initial droplet volume and effective temperature conditions. The oil droplet was suspended on a tungsten fiber in the combustion chamber and the ignition process was recorded by a high-speed camera through the quartz window mounted at the end of the combustion chamber. The pressure traces were also obtained by a sensor in order to get the ignition delay and analyze the combustion process in detail.The results show that with the decrease of initial droplet volume, the pre-ignition induction by oil droplet in the ambient gaseous mixture would be more remarkable. The effect of effective temperature on droplet/gas ignition is quite complex. The negative temperature coefficient (NTC) behavior makes the pre-ignition induction…
Annotation icon