| 摘要 |
PROBLEM TO BE SOLVED: To solve a new problem of occurrence of pre-ignition in engine starting in a high compression and spark ignition type internal combustion engine having a spark plug for spark-igniting a mixture in a combustion chamber and a geometrical compression ratio set to be equal to or larger than 12. SOLUTION: The spark ignition type internal combustion engine is equipped with an electric water pump of an electric motor-driven type for circulating cooling water. In a second periodΔT2 after engine stop, the electric water pump is kept in an operation state and a second control valve is closed so that cooling water is circulated only to a cylinder head to prevent the pre-ignition in engine starting. COPYRIGHT: (C)2009,JPO&INPIT
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