Your Selections

Valve trains
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Engine Valve Train Dynamic Analysis using 1-D Simulation Approach

Tafe Motors and Tractors Limited-Ajay Nain, Devendra Nene
  • Technical Paper
  • 2019-28-2422
To be published on 2019-11-21 by SAE International in United States
In order to reduce engine development timing and cost, a numerical calculation used to evaluate valve train systems. This paper discusses the work done on kinematic and dynamic analysis of Valve Train (VT) system of a diesel engine by using 1-D Ricardo Valdyn software. The goal is to meet optimum intake, exhaust valve timing requirement, maximize valve open area and 20% overspeed requirement. Valve train model is prepared and inputs like mass and stiffness are estimated from actual weighing and finite element approach respectively. Simulation model is used for predicting valve bounce speed, valve displacement, cam-follower contact stress and strain in the rocker arm. Initially, Kinematic analysis is carried out to study the change in valve motion characteristics such as cam contour radius, tappet contact eccentricity etc. Further to this, dynamic analysis is carried out to assess forces and stresses on valve train components. Effect of cam tappet contact stresses, buckling load on push rod, spring surge, ratio of spring force to inertia force, valve seating velocity at increased speed condition etc. are discussed in…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Design and Development of Intake Ports for 2-Valve & 4-Valve Configurations for Heavy Duty Off-Highway Diesel Engine

College of Engineering-Sameer Tikar, Dileep Malkhede, Milankumar Nandgaonkar
  • Technical Paper
  • 2019-28-0042
To be published on 2019-10-11 by SAE International in United States
Future emission limits for off-highway application engines need advanced power train solutions to meet stringent emissions legislation, whilst meeting customer requirements and minimizing engineering costs. Development of diesel engines for off-highway application for different power segments need different intake port design solutions to optimise in-cylinder flow structure for efficient combustion. With adaptation of low pressure mechanical fuel injection system, intake port development becomes an important stage for reduction of emission formation at the source and improvement in fuel economy.In this paper, intake port design and development process is elaborated for two different power ratings of 75 hp and 120 hp of off-highway engine. 2-valve and 4-valve configurations are deployed for the same cylinder bore size. Considering the legislative emission limits for these two power segments of engines, intake port are designed for target swirl and flow performance within the same constraints of cylinder head bolting pattern and valve train actuation mechanism. Intake port designs are experimentally evaluated on steady state flow test rig using AVL paddle wheel method for swirl and flow coefficient performance. A…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Development of Valve Train Configurations Optimized for Cold Start and Their Effect on Diesel Soot Emission

KIT - Karlsruhe Institute of Technology-Panagiotis Maniatis, Daniel Erforth, Uwe Wagner, Thomas Koch
Published 2019-09-09 by SAE International in United States
The continuous pursuit of more efficient diesel engines and the stricter emission regulations with the introduction of the Real Driving Emissions test (RDE) necessitate further investigations of heating strategies and their suitability in terms of series production. Under these circumstances heating strategies of a variable valve train for a single-cylinder research diesel engine have been first simulated and then experimentally tested at the Institute of Internal Combustion Engines of the Karlsruhe Institute of Technology (KIT).By combining statistical experimental design (DoE) and 1-D gas exchange simulations, empirical DoE models for the design of suitable camshaft configurations have been established. After having performed a potential assessment, the most favorable configurations were manufactured and subsequently tested. The configuration with an additional opening of an outlet valve during the intake stroke (2nd Event) shows the best compromise between engine out HC/CO emissions and an efficient exhaust gas temperature increase.The strategy-related state changes in the combustion chamber when using a 2nd Event and the resulting soot characteristics, in terms of size and distribution, resulting reactivity and filter soot number, are…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

A Global Sensitivity Analysis Approach for Engine Friction Modeling

SAE International Journal of Engines

BMW Group, Germany-Oleg Krecker, Christoph Hiltner
  • Journal Article
  • 03-12-05-0035
Published 2019-08-21 by SAE International in United States
Mechanical friction simulations offer a valuable tool in the development of internal combustion engines for the evaluation of optimization studies in terms of time efficiency. However, system modeling and evaluation of model performance may be highly complex. A high number of interacting submodels and parameters as well as a limited model transparency contribute to uncertainties in the modeling process. In particular, model calibration and validation are complicated by the unknown effect of parameters on the model output. This article presents an advanced and model-independent methodology for identifying sensitive parameters of engine friction. This allows the user to investigate an unlimited number of parameters of a model whose structure and properties are prior unknown. In contrast to widely used parameter studies, in which only one parameter is varied at a time, the use of the elementary effect method enables the consideration of interactions in the entire parameter space. Based on a sensitivity analysis (SA), the methodology offers a comprehensive and practicable approach to improve model performance and effectiveness of predictive optimization studies. The methodology is validated…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Global Tests and Specifications for Automotive Engine Oils

Fuels and Lubricants TC 1 Engine Lubrication
  • Ground Vehicle Standard
  • J2227_201905
  • Current
Published 2019-05-08 by SAE International in United States
This SAE Information Report lists engine and laboratory tests for service fill engine oils which are associated with specifications and classifications established outside of SAE J304 and SAE J183. These specifications and classifications include those developed prior to April 1, 2017, by international technical societies, as well as individual original equipment manufacturers. The information contained within this report applies to engine oils utilized in gasoline- and diesel-powered automotive vehicles.
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Valve Opening and Closing Event Finalization for Cost Effective Valve Train of Gasoline Engine

Maruti Suzuki India, Ltd.-Sanjay Poonia, Amandeep Singh, Narinder Kumar, Jaspreet Singh, Shailender Sharma
Published 2019-04-02 by SAE International in United States
With more stringent emission norm coming in future, add more pressure on IC engine to improve fuel efficiency for survival in next few decades. In gasoline SI (spark ignition) engine, valve events have major influence on fuel economy, performance and exhaust emissions. Optimization of valve event demands for extensive simulation and testing to achieve balance between conflicting requirement of low end torque, maximum power output, part load fuel consumption and emission performance. Balance between these requirements will become more critical when designing low cost valve train without VVT (Variable valve timing) to reduce overall cost of engine.Higher CR (Compression ratio) is an important low cost measure to achieve higher thermal efficiency but creates issue of knocking thereby limiting low speed high load performance. The effective CR reduction by means of late intake valve closing (LIVC) is one way to achieve higher expansion ratio while keeping high geometric CR. Due to backflow at low engine speed by late IVC (Intake valve closing) it is challenging to implement late IVC without compromising low end high load performance…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Gas Content in Lubricants of Modern Powertrain Systems - Development of a Continuous Volumetric Measurement Method

FEV Europe GmbH-Peter Theisen, Kolja Orlowsky
Institute for Combustion Engines, RWTH Aachen University-Benedikt Hammermueller, Daniel Hanciogullari
Published 2019-04-02 by SAE International in United States
Our expectations in lubrication systems applied in modern powertrains are continually rising. Beginning with the basic function of cooling and lubricating tribological contacts such as cylinder liner and piston, bearings, gears, chain drives and various valve train contacts, the oil in the lubrication system is now increasingly being used as a hydraulic fluid. Examples are (fully) variable valve trains, variable compression ratio systems or complicated transmission hydraulics. Driven by the general trend to minimize mechanical losses in order to increase the overall powertrain efficiency, the introduction of variable capacity oil pumps is commonly seen in latest engine designs. The potential to decrease oil pressure levels and volumetric oil flow in order to minimize mechanical losses on the one hand significantly complicates the reliable fulfillment of the aforementioned tasks of the lube systems on the other hand. In this context one of the core parameters for a reliable operation of modern lubrication systems in engines and transmissions is the gas content of the oil. Even though this circumstance is still partially underestimated during engine development, it…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

2-Stroke Engine Options for Automotive Use: A Fundamental Comparison of Different Potential Scavenging Arrangements for Medium-Duty Truck Applications

Saudi Aramco-Robert A. Head, Junseok Chang, Nayan Engineer
University of Bath-James W. G. Turner, Roshan Wijetunge, David W. Blundell, Paul Burke
Published 2019-01-15 by SAE International in United States
The work presented here seeks to compare different means of providing scavenging systems for an automotive 2-stroke engine. It follows on from previous work solely investigating uniflow scavenging systems, and aims to provide context for the results discovered there as well as to assess the benefits of a new scavenging system: the reverse-uniflow sleeve-valve.For the study the general performance of the engine was taken to be suitable to power a medium-duty truck, and all of the concepts discussed here were compared in terms of indicated fuel consumption for the same cylinder swept volume using a one-dimensional engine simulation package. In order to investigate the sleeve-valve designs layout drawings and analysis of the Rolls-Royce Crecy-type sleeve had to be undertaken.A new methodology for optimization was developed and the analysis process also took into account work done by the charging system, this being assumed to be a combination of supercharger and turbocharger to permit some exhaust waste heat recovery.As a result of this work it was found that the opposed-piston configuration provides the best attributes since it…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Piston Detergency and Anti-Wear Performance of Non-Phosphorus and Non-Ash Engine Oil

Idemitsu Kosan Co., Ltd.-Moritsugu Kasai, Hiroaki Koshima, Yoriyuki Takashima
Published 2019-01-15 by SAE International in United States
The deposition of ash derived from engine oil on the surface of diesel particle filters (DPF) has recently been reported to degrade the performance of the DPF. It is generally known that phosphorus in engine oil is adsorbed on the surface of an automotive exhaust catalyst, reducing the performance of the catalyst. Thus, the amounts of ash and phosphorus in engine oil have been decreased. We have developed a non-phosphorus, non-ash engine oil (NPNA) that does not contain metal-based detergents or zinc dialkyldithiophosphate (ZnDTP). Various engine tests were performed, and we confirmed that under normal running conditions, the NPNA oil had a sufficiently high piston detergency and wear resistance-two important requirements for engine oil-to meet current American and Japanese standards.However, the piston detergency of NPNA required further improvement when engine running conditions were more severe. We performed a hot tube test to evaluate the piston detergency of NPNA at high temperatures and developed additives (ashless detergents) that did not contain ash (metallic elements). We then evaluated the piston detergency and valve train wear prevention of…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Advanced Automated Analysis Methodology for Predicting the Valve Durability

Durovalves India Pvt Ltd-Jitendra Sharma, Gurunathan Ramnathan
Ricardo Software-Ankush Bhayekar, John Foy, Yogesh Umbarkar
Published 2019-01-09 by SAE International in United States
Recent advancements in IC engine and Hybrid vehicles emphasize the use of higher rated fuels with higher calorific values, leading to higher operating temperature and pressure values. This makes the design of valve train components a complex task. Typically, IC engine valves are subjected to varying stresses throughout an engine cycle. This can result in fatigue failure of valves in many applications where the supplier was deficient in advanced analysis methodologies. Considering this fact, a new technique for valve durability and life predictions has been developed using various approaches such as internal semi-empirical thermal boundary conditions calculation tool, Multibody Dynamics (MBD) and Finite Element Modelling (FEM). In this study, a bi-metallic (Stem - X45 CrSi 9 3 and Head - X50 CrMnNiNbN 21 9) exhaust valve operating under direct attack valvetrain of 1.2L inline 3-cylinder gasoline engine has been considered. Internal semi-empirical tool and literature work on gas flow has been used to predict the thermal boundary (gas side temperatures and HTCs at various locations) conditions. The predicted thermal BCs are then used to predict…
This content contains downloadable datasets
Annotation ability available