This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Exhaust-Gas Recirculation - A Measure to Reduce Exhaust Emissions of DI Diesel Engines
Annotation ability available
Sector:
Language:
English
Abstract
It can be expected that the high speed DIdiesel enginewill play a major role as a drive system for passenger cars and light duty vehicles. The reason is its fuel consumption which is the lowest of all combustion engines. Of course, low exhaust emission levels expecially particulates (PM) and nitric oxides NOx are a requirement in this context. Exhaust gas recirculation (EGR) can contribute decisively to achieve acceptable emission levels with high speed DI diesel engines.
On the basis of fundamental investigations into the influence of EGR on the combustion process of DI diesel engines, it will be shown how the exhaust gas should be recirculated to obtain effective emission reductions.
In particular, it was found that so called “Hot EGR” which keeps the temperature of the recirculated exhaust gases at a very high level, not only helps to reduce NOx but also contributes distinctly to achieve lower hydrocarbon (HC) and PM emissions. In addition, there is no adverse affect of EGR on the fuel economy. Very positive effects of EGR can be achieved especially at low loads and up to medium loads.
EGR can be combined advantageously with other emission reducing measures such as flexible injection timing control or application of catalytic converters. Most promising results were obtained with a closed loop control of the EGR rate which allows a precise adjustment in the amount of recirculated exhaust gases at various engine operating points.
Recommended Content
Authors
Topic
Citation
Dürnholz, M., Eifler, G., and Endres, H., "Exhaust-Gas Recirculation - A Measure to Reduce Exhaust Emissions of DI Diesel Engines," SAE Technical Paper 920725, 1992, https://doi.org/10.4271/920725.Also In
References
- Pischinger F. Emissions and Fuel Consumption of Diesel Engines for Vehicle Drive - Status Report Belgrad 2 6 6 1986
- Schulte H Dürnholz M. Endres H. Development Potential of High Speed DI Diesel engines SAE 881208
- Pischinger F. Schulte H. Baselines and Development Trends of The Diesel Combustion Process, VDI-Meeting “The Future of The Diesel Engine” Wolfsburg 22 24 11 1988
- Endres H. Comprex Supercharging of High Speed DI Diesel Engines for Vehicle Drive RWTH Aachen 1985
- Eifler G. Reduction of Pollutant Emissions by Exhaust Gas Recirculation for High Speed DI Diesel Engines RWTH Aachen 1990
- Hansen J. Investigations of The Combustion and Soot Formation Process of an IDI Diesel Engine Using a Fast Gas Sampling Valve RWTH Aachen 1989