Patent ID: 8050845

Claim:
A fuel pressure controller provided to a fuel supply system which includes a fuel pump having a flow control valve for adjusting a fuel quantity by displacing a spool by means of a magnetic force generated by a solenoid and a biasing force generated by a spring, an accumulator accumulating a fuel discharged by the fuel pump, and a pressure detecting means for detecting a fuel pressure in the accumulator, the fuel pressure controller feedback controlling a detected fuel pressure in the accumulator to a target pressure by an energization operation to the solenoid, the fuel pressure controller comprising: an estimating means for estimating a parameter indicative of a displacement amount of the spool based on a parameter for estimating a fuel quantity which is actually adjusted by the flow control valve; and a detecting means for detecting a malfunction of the flow control valve based on a fact that the displacement amount corresponding to an estimation result by the estimating means is not more that a specified value in a situation that the detected fuel pressure deviates from the target pressure.