| 摘要 |
PROBLEM TO BE SOLVED: To detect abnormality of a high pressure fuel supply system at an early stage and identify an abnormal part. SOLUTION: A low pressure side fuel pressure sensor 33 detecting fuel pressure (low pressure side fuel pressure) in a low pressure side fuel pipe 13 connecting a low pressure pump 12 and a high pressure pump 14. An ECU 36 counts number of times when it is determined that low pressure side fuel pressure is lower than a normal range in a predetermined period of time and determines that a first abnormal mode occurs when the count value is a predetermined number of higher. Also the ECU 36 counts number of times when it is determined that low pressure side fuel pressure is higher than a normal range in a predetermined period of time and determines that a second abnormal mode occurs when the count value is a predetermined number of higher. The first abnormal mode occurs due to deterioration of delivery capacity of the low pressure pump 12 or abnormality of a pulsation damper 34 (large amount fuel leak) or the like, and the second abnormal mode occurs due to abnormality of the pulsation damper 34 (abnormal drop of fuel pressure pulsation reduction effect) or the like. COPYRIGHT: (C)2005,JPO&NCIPI
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