Abnormality-determining device and method for fuel supply system

摘要

A device for determining abnormality of a fuel supply system, which is capable of determining abnormality of the fuel supply system including a fuel pressure sensor (21) more accurately. A device for determining abnormality of a fuel supply system that has a fuel pressure sensor (21) for detecting pressure of fuel in an accumulator (9) as detected fuel pressure calculates a predetermined normal-time fuel pressure indicative of pressure fuel in the accumulator (9) which is to be detected when the system is normal, according to a fuel flow rate relationship parameter indicative of a relationship between an inflow fuel amount parameter indicative of an amount of fuel flowing into the accumulator (9) and an outflow fuel amount parameter indicative of an amount of fuel flowing out of the accumulator (9), and determines abnormality of the fuel supply system based on a result of comparison between the detected fuel pressure and the calculated normal-time fuel pressure.