| 摘要 |
PROBLEM TO BE SOLVED: To enable single compression starting even at an engine stop position, at which the single compression starting has failed conventionally, while reducing fuel leakage (oil-tightness leakage) from a fuel injection valve during engine stoppage by reducing fuel pressure in a high-pressure fuel system after the engine stops in the high pressure supply system of a direct injection engine. SOLUTION: A pressure reducing valve 29 is provided for reducing fuel pressure in a high-pressure fuel system, which supplies high-pressure fuel from a high-pressure pump 14 to a fuel injection valve 34, after the engine stops. An ECU 37 detects or estimates an engine stop position when the engine stops and sets after-stop target fuel pressure in accordance with the detected or estimated engine stop position. The ECU 37 controls a valve opening action of a pressure reducing valve 29 to reduce the fuel pressure in the high-pressure fuel system to the after-stop target fuel pressure after the engine stops. In the control, the ECU 37 sets the after-stop target fuel pressure to be lower as a piston position of a cylinder in a compression stroke at the engine stop position is closer to a top dead center. COPYRIGHT: (C)2009,JPO&INPIT
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