| 摘要 |
PROBLEM TO BE SOLVED: To prevent fuel supply shortage from occurring due to the deterioration of a high-pressure fuel pump 21 with the elapse of time in a control device A controlling intake air and fuel according to the operating state of an engine 1. SOLUTION: During the operation of the engine 1, a fuel pressure is feedback-controlled by adjusting the delivery amount of the high-pressure fuel pump 21 by the closing timing (spill angle) of a spill valve 21d (SA4 to SA6). When the advance angle correction amount of a target spill angle from a reference spill angle exceeds a deterioration determination amountα(YES in SA9) with an actual fuel pressure matching a general target fuel pressure (YES in SA8), it is predicted that the fuel supply shortage occurs in a high load area due to the deterioration of a pump, and a target supercharging pressure on a high load side is correctively reduced (SA10) in a supercharging pressure control map to compensate for the shortage of fuel. COPYRIGHT: (C)2005,JPO&NCIPI
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