| 摘要 |
<P>PROBLEM TO BE SOLVED: To precisely detect an abnormality failure generated in at least one or more pressure feeding systems among a plurality of pressure feeding systems in a supply pump without conducting special operation for detecting the abnormality failure such as a pressure feeding defect, overpressure or the like in the supply pump. <P>SOLUTION: In this pump abnormality diagnosis device for a supply pump of such a type that a pump pressure feed quantity is controlled at a plurality of pressure systems by a single SCV. A pump delivery quantity between 360°CA's for the respective pressure feed systems in the supply pump is determined. In the case that the pump delivery quantity between the 360°CA's is less than a determination threshold determined based on a pressure feed quantity for one pressure feed system when the pump is normal for at least one pressure feed system, it is diagnosed that a pressure feed failure is generated in the pressure feed system. In the case that the pump delivery quantity between the 360°CA's is larger only for at least one pressure feed system, it is diagnosed that an overpressure feed failure is generated in the pressure feed system. <P>COPYRIGHT: (C)2004,JPO |
