This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Theoretical and Experimental Evaluation of Engine Brake Performance of Heavy Duty Diesel Engine
Technical Paper
2013-01-2844
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Modern medium duty diesel engines are all developed with engine brake as a standard feature. The main purpose of the engine brake in an automobile is to deliver high vehicle retardation, engine safety and longer foundation brake life. It allows the driver to possess complete control of the vehicle while driving downhill without the need for frequent usage of foundation brakes. This intern prevents the engine revs from exceeding the safe limit thereby protecting the engine. It also help reduce the fuel consumption by avoiding unnecessary braking and thereby necessitating to accelerate again.
Typically the braking power in a diesel engine is generated by closing the exhaust system partially or completely. This would increase the back pressure in the exhaust circuit and thereby increase the piston work of the engine. This negative work is used for vehicle braking. This system is called as “Exhaust brake”. The braking power developed is typically a function of the engine size and the engine speed. The braking power can be further enhanced by using the exhaust valves as throttles. This is achieved by various patented hydraulic or electrical actuation mechanisms which would keep one of the exhaust valves in open condition during the intake, compression, expansion strokes until normal exhaust stroke takes place.
As a first step of development of this engine brake system for Ashok Leyland's New generation medium duty diesel engine a 1D thermodynamic simulation was performed using AVL Boost 5.1 software to predict the braking performance. This thermodynamic simulator allowed iterative investigation all the design parameters at a virtual level without the cost and time of prototyping and testing. Finally the optimized design parameters were prototyped and tested experimentally and the results are compared.
Recommended Content
Authors
Topic
Citation
J, N., D V, R., Bolar, Y., and T S, R., "Theoretical and Experimental Evaluation of Engine Brake Performance of Heavy Duty Diesel Engine," SAE Technical Paper 2013-01-2844, 2013, https://doi.org/10.4271/2013-01-2844.Also In
References
- Price , R. and Meistrick , Z. A New Breed of Engine Brake for the Cummins L10 Engine SAE Technical Paper 831780 1983 10.4271/831780
- Schmitz , T. , Bergmann , H. , and Daeuble , H. The New Mercedes-Benz Engine Brake with Decompression Valve SAE Technical Paper 920086 1992 10.4271/920086
- Gray , C. A Review of Variable Engine Valve Timing SAE Technical Paper 880386 1988 10.4271/880386
- Meistrick , Z. Jacobs New Engine Brake Technology SAE Technical Paper 922448 1992 10.4271/922448
- Greathouse , J. , Pekar , F. , and Gibson , R. The Mack Maxidyne, ENDT865 Diesel with Dynatard Engine Brake SAE Technical Paper 710557 1971 10.4271/710557
- Yang , Z. A Study of Two-Stroke Engine Braking for HD Diesel Engines SAE Technical Paper 2002-01-0487 2002 10.4271/2002-01-0487
- Lancefield , T. , Methley , I. , Räse , U. , and Kuhn , T. The Application of Variable Event Valve Timing to a Modern Diesel Engine SAE Technical Paper 2000-01-1229 2000 10.4271/2000-01-1229
- Göhring , E. , Glasner , E. , and Povel , R. Engine Braking Systems and Retarders - An Overview from an European Standpoint SAE Technical Paper 922451 1992 10.4271/922451
- Schmitz , T. , Holloh , K. , Fleckenstein , G. , and Juergens , R. The New Mercedes-Benz Engine Brake with Pulsed Decompression Valve -Decompression Valve Engine Brake (DVB) SAE Technical Paper 942266 1994 10.4271/942266
- Karidis , J. and Turns , S. Fast-Acting Electromagnetic Actuators -Computer Model Development and Verification SAE Technical Paper 820202 1982 10.4271/820202
- Morel , T. , Keribar , R. , Silvestri , J. , and Wahiduzzaman , S. Integrated Engine/Vehicle Simulation and Control SAE Technical Paper 1999-01-0907 1999 10.4271/1999-01-0907