Patent ID: 7171944

Claim:
A high-pressure fuel pump control device for an internal combustion engine, characterized in that the device comprises: various sensors for detecting an operation state of an internal combustion engine; a high-pressure fuel pump for pressurizing and discharging low-pressure fuel, which has been sucked; a flow control valve for adjusting a quantity of fuel discharged from the high-pressure fuel pump when drive timing is set; an accumulator for accumulating a pressure of the fuel discharged from the high-pressure fuel pump; fuel injection valves for injecting and supplying the fuel in the accumulator to respective combustion chambers of the internal combustion engine; a fuel pressure sensor for detecting a fuel pressure in the accumulator; target pressure setting means for setting a target pressure in the accumulator on the basis of the operation state; feedback quantity calculating means for calculating a fuel discharge feedback quantity of the high-pressure fuel pump according to a proportional integral operation based on a pressure deviation between the target pressure and the fuel pressure detected by the fuel pressure sensor; flow control valve controlling means for setting the drive timing of the flow control valve on the basis of a target fuel discharge quantity calculated by adding up a fuel injection quantity of the fuel injected from the fuel injection valve and the fuel discharge feedback quantity; and integral operation update prohibiting means, and in that the integral operation update prohibiting means prohibits, when a number of times of calculation of the fuel discharge feedback quantity reaches a first predetermined number of times while a sign of the pressure deviation does not invert, update of an integral operand in the fuel discharge feedback quantity, and resumes, when the sign of the pressure deviation inverts after that, the update of the integral operand.