To prevent deterioration in fuel economy by a rich spike to obtain a high exhaust emission control effect, while reducing pumping loss by stratified charge combustion to improve fuel economy.
An opening/closing timing for an intake valve is shifted by a variable mechanism and EGR gas is made to flow first into a cylinder. An air fuel ratio therefore is always kept in the vicinity of a theoretical air fuel ratio, while reducing the pumping loss by stratifying air-fuel mixture and EGR gas, and excellent combustion can be performed. Since a three-way catalyst can be used, a lean NOx catalyst becomes unnecessary, the deterioration in the fuel economy by the rich spike can be prevented, the cost can be reduced, and the large emission control effect can be obtained.
COPYRIGHT: (C)2004,JPO
Koji Onishi
Fujii Keishi
Mamoru Fujieda
Noboru Tokuyasu
株式会社日立カーエンジニアリング
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