Patent ID: 7559313

Claim:
An apparatus for controlling a variable capacity type fuel pump for transferring fuel under pressure, in which pump the fuel is pressurized within a pressurizing chamber by a reciprocal movement of a plunger through rotation of a cam, transferred into a common rail for assimilating accumulating pressure of the fuel therein, and thereafter injected by an injector and for controlling timing for driving a variable capacity control mechanism for adjusting the fuel to be returned from said pressurizing chamber back to a side of a low-pressure passage, thereby controlling a flow rate discharged therefrom, wherein a control is provided in said controlling apparatus to control driving timing of said variable capacity control mechanism with respect to the driving timing of said injector, so as to keep a distance between an operational sound generating timing of said injector and an operational sound generating timing of the variable capacity control mechanism at least equal to or greater than a predetermined distance.