| 摘要 |
A pump control valve contained in a high-pressure fuel pump is closed when an engine is stopped, so that the pressure of a common rail is prevented from becoming too high when the engine speed NE is not less than a predetermined value alpha. The pump control valve is opened when the engine speed NE is decreased to a predetermined value alpha. Consequently, a predetermined amount of fuel is stored in the pump because the high-pressure fuel pump sucks fuel but does not deliver the fuel to the common rail. Therefore, a lack of fuel being delivered at early stage of startup is prevented because the fuel stored in the pump can be delivered to the common rail in a subsequent startup of the engine. Thus, the pressure of fuel necessary to start the engine can be obtained in a short time, and the time for startup can be decreased.
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