Dr. Martin Knopf
Department Head
Engine Management Systems
Corporate Research and Development
Editorial
New Combustion Methods
Everyone will agree that emissions of exhaust pollutants and CO2 from motor vehicles must be reduced further. In practice, these objectives conflict with each other. If one of these is reduced, the other inevitably rises. With the more stringent regulations expected in 2010 (Euro 5), this conflict can no longer be resolved simply by increasing the proportion of diesel engines on the road. In fact, sophisticated exhaust gas purification may result in higher CO2 emissions and increased fuel consumption.
The main thrust in anticipation of Euro 5 must be to maintain the CO2 values already achieved with diesel combustion and to fully exploit all available internal combustion techniques. Thus, the latter would lessen the conflict between these goals and reduce the need for costly exhaust after-treatment. Homogeneous Charge Compression Ignition (HCCI) increases efficiency and thereby lowers CO2 emissions and fuel consumption in the gasoline engine. In the diesel engine, on the other hand, it reduces raw emissions. This new combustion process makes it possible to meet future nitrogen oxide limits in the engine’s partial-load range without costly exhaust after-treatment systems.
Everyone will agree that emissions of exhaust pollutants and CO2 from motor vehicles must be reduced further. In practice, these objectives conflict with each other. If one of these is reduced, the other inevitably rises. With the more stringent regulations expected in 2010 (Euro 5), this conflict can no longer be resolved simply by increasing the proportion of diesel engines on the road. In fact, sophisticated exhaust gas purification may result in higher CO2 emissions and increased fuel consumption.
The main thrust in anticipation of Euro 5 must be to maintain the CO2 values already achieved with diesel combustion and to fully exploit all available internal combustion techniques. Thus, the latter would lessen the conflict between these goals and reduce the need for costly exhaust after-treatment. Homogeneous Charge Compression Ignition (HCCI) increases efficiency and thereby lowers CO2 emissions and fuel consumption in the gasoline engine. In the diesel engine, on the other hand, it reduces raw emissions. This new combustion process makes it possible to meet future nitrogen oxide limits in the engine’s partial-load range without costly exhaust after-treatment systems.
Author of the Editorial
Responsible for the content
Robert Bosch GmbH
Dr. Martin Knopf
CR/AEE
P.O. Box 30 02 40
70442 Stuttgart, Germany
Phone: +49 (0) 711 811-1513
Fax: +49 (0) 711 811-1600
Dr. Martin Knopf
CR/AEE
P.O. Box 30 02 40
70442 Stuttgart, Germany
Phone: +49 (0) 711 811-1513
Fax: +49 (0) 711 811-1600
