This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Optimized Design of the Exhaust Brake of the Automotive Diesel Engine
Annotation ability available
Sector:
Language:
English
Abstract
Exhaust brake performance is an important factor in the design of the automotive diesel engine. Many devices have been developed to achieve a higher exhaust brake force; however, most of these are complicated and expensive. This paper deals with an optimised design method for the exhaust brake system based on conventional engine components. The component design was optimised by use of a simulation program for exhaust valve behaviour and pulsating pressure waves in the exhaust pipe, which was developed at Isuzu Motors Ltd. based on an existing program.
It was found that the predictions from the computer simulation agreed well with the measured data, not only in respect of exhaust brake force but also valve bounce, exhaust port pressure and so on. The simulation program proved to be a useful means of predicting the effect of various brake design parameters, and enabled an optimised exhaust brake system to be achieved at the design stage. The original exhaust brake force obtained on a particular turbocharged diesel engine was a mean effective pressure of 0.56MPa at rated speed. Modification of the existing exhaust manifold configuration, which took better account of the pulsating pressure available therein, increased braking mean effective pressure to 0.74MPa. A braking mean effective pressure of 0.90MPa, corresponding to 103% of the rated power, was achieved by adopting a specially designed valve spring.
Recommended Content
| Technical Paper | EXHAUST BRAKE EFFECTIVENESS |
| Technical Paper | Online Oil Dilution Measurement at GDI Engines |
| Technical Paper | Durability Analysis of Heavy Duty Engine Exhaust Manifold Using CFD-FE Coupling |
Authors
Topic
Citation
Akiba, K., Ohtani, M., and Yoshiki, H., "The Optimized Design of the Exhaust Brake of the Automotive Diesel Engine," SAE Technical Paper 810344, 1981, https://doi.org/10.4271/810344.Also In
References
- Greathouse J. F. Paker F. J. Gibson R. B. “The Mack Maxidyne, ENDT865 Diesel with Dynatard Engine Brake” SAE Paper 710557 1971
- Morse W. H. Rife J. M. “Compressio Engine Brake Performance with Turbocharged Diesel Engines” SAE Paper 790767 1979
- Benson R. S. “A Comprehensive Digital Computer Program to Simulate a Compression Ignition Engine Including Intake and Exhaust Systems” SAE Paper 710175 1971
- Low S. C. Benson R. S. Winterbone D. E. “Computer Aided Design Package for Diesel Engine Manifold System” SAE Paper 790277 1979
- Miiumachi N. Yoshiki H. Endoh T. “A Study on Performance of Radial Turbine under Unsteady Flow Conditions” Report of the Insti. of Industrial Science, the Univ. of Tokyo 28 1 1979
- Nagao F. Shimamoto Y. “On the Transmission of the Blow-Down Energy in the Exhaust System of a Diesel Engine” Bulletin of JSME 2 5 1959
- Sakai H. Tsuda K. “Analysis of Valve Motion in Overhead Valve Linkages” Bulletin of JSME 13 55 1970
- Kanesaka H. Akiba K. Sakai H. “A New Method of Valve Cam Design - HYSDYNE Cam” SAE Paper 770777 1977