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Turbocharging the DI Gasoline Engine
Technical Paper
2000-01-0251
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
SAE 2000 World Congress
Language:
English
Abstract
Regarding concepts for naturally aspirated engines, the high potential for fuel economy of Gasoline Direct Injection can only partially be utilized within the constraints of current or future emission legislation like EURO III / IV or LEV/ULEV. Instead of an expected improvement of 20 - 25 % currently only 10 - 15% can be obtained by the engine alone without vehicle optimizations considering all limitations of high volume production. A detailed analysis reveals concrete measures for further improvement.
The application of DI gasoline technology clearly favors the combination with other fuel efficient technologies like downsizing by turbocharging and the application of a variable effective compression ratio by intake valve timing variation.
Using the flexibility of direct gasoline injection some deficiencies of these technologies can be eliminated. In view of an advanced DI gasoline engine concept, the following aspects were investigated:
It was analyzed, if stratified part load operation will be improved by turbocharging. The main subject her was the possible extension of the stratified operational range.
Regarding the driveability of downsizing concepts, transient effects were investigated regarding load response of the engine.
The concept of variable effective compression by intake valve timing retard was analyzed by thermodynamic cycle simulation and multicylinder engine verification in order to improve the engine efficiency further in a broad load range. For an integrated concept combining turbocharging and variable effective compression, a predicted fuel economy potential of up to 28% can be expected from engine technology with further advantages in transient response and driveability to be experienced in real customers use.
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Citation
Wirth, M., Mayerhofer, U., Piock, W., and Fraidl, G., "Turbocharging the DI Gasoline Engine," SAE Technical Paper 2000-01-0251, 2000, https://doi.org/10.4271/2000-01-0251.Also In
References
- Wirth, M. Piock, W. Fraidl, G. Schöggl, P. Winklhofer E. Gasoline DI Engines: The Complete System Approach by Interaction of Advanced Development Tools SAE 980492
- Strehlau, W. Göbel, U. Höhne, J. Müller, W. The Development of an Emission Aftertreatment System for Gasoline Direct Injection Passenger Cars FISITA FT98T218 Paris 1998
- Küsell, M. Moser, W. Philipp, M. Motronic MED7 for Gasoline Direct Injection engines: Engine Management System and Calibration Procedures SAE 1999-01c1284
- Wirth, M. Piock, W. F. Holy, G. Unger, E. Fraidl, G. K. Gasoline Direct Injection: The Fuel Economy Concept for EU IV Emission Regulation Internal Combustion Engine Syposium KSAE Seoul july 1999
- Mayerhofer, U. Fraidl, G. K. Piock, W. F. Wirth, M. Concept of a Supercharged Gasoline DI Engine 3 rd Stuttgart Symposium 24.-25. 2 1999