HIGH-PRESSURE FUEL SUPPLY SYSTEM ENABLING DISCRIMINATION OF ABNORMALITY OF HIGH-PRESSURE FUEL SYSTEM AND MEASURE AGAINST ABNORMALITY

摘要

PPROBLEM TO BE SOLVED: To provide a high-pressure fuel supply system capable of accurately detecting the trouble of a high-pressure fuel system. PSOLUTION: This high-pressure fuel supply system comprises a feed pump for feeding a fuel from a fuel tank, a high-pressure fuel pump receiving the fuel from the feed pump, a delivery pipe connected to the high-pressure fuel pump and feeding the fuel to a fuel injection device, a fuel pressure sensor detecting the pressure of the fuel in the delivery pipe, and an electronic control unit controlling, by feedback, the pressure of the fuel in the delivery pipe to a specified pressure based on the output of the pressure sensor. The electronic control unit is formed to determine the abnormality of the high-pressure fuel supply system based on the state of a feedback coefficient for feedback control. Since the abnormality of the high-pressure fuel supply system can be detected based on the state of the feedback coefficient used for the control of fuel pressure, a corrective action against trouble can be immediately taken. PCOPYRIGHT: (C)2005,JPO&NCIPI