Simultaneous Attainment of Low Fuel Consumption High Output Power and Low Exhaust Emissions in Direct Injection SI Engines

This paper describes simultaneous attainment in improving fuel consumption, output power and reducing HC emissions with a direct injection S.I. engine newly developed in Nissan. Straight intake port is adopted to increase discharge coefficient under WOT operation and horizontal swirl flow is generat...

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Bibliographic Details
Published in:SAE transactions 1998-01, Vol.107, p.215-225
Main Authors: Takagi, Yasuo, Itoh, Teruyuki, Muranaka, Shigeo, Iiyama, Akihiro, Iwakiri, Yasunori, Urushihara, Tomonori, Naitoh, Ken
Format: Article
Language:English
Subjects:
Combustion
Combustion chambers
Cylinders
Engines
Fuel combustion
Fuel consumption
Fuel injection
Fuels
Gasoline engines
Pistons
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Summary:This paper describes simultaneous attainment in improving fuel consumption, output power and reducing HC emissions with a direct injection S.I. engine newly developed in Nissan. Straight intake port is adopted to increase discharge coefficient under WOT operation and horizontal swirl flow is generated by a swirl control valve to provide stable stratified charge combustion under part load conditions. As a result, fuel consumption is reduced by more than 20% and power output is improved by approximately 10%. Moreover, unburned HC is reduced by equivalently 30% in engine cold start condition. An application of diagnostic and numerical simulation tools to investigate and optimize various factors are also introduced.
ISSN:0096-736X
2577-1531