| 摘要 |
PROBLEM TO BE SOLVED: To avoid knocking with a low cost structure and improve emission in materialization of high compression ratio engine. SOLUTION: An engine body 20 of which geometrical compression ratio is set to 14 or higher is provided. An exhaust pipe 140 of the engine body 20 is set in such a manner that distance from an exhaust port 29 to a catalyst unit 146 is length L to be a predetermined low exhaust pressure specification. A control means executes cold start control to inject at least part of fuel to be injected in compression stroke at cold start. COPYRIGHT: (C)2008,JPO&INPIT
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