| 摘要 |
A variable delivery fuel supply device comprising fuel injection valves 1a through 1d injecting a fuel to cylinders of a combustion engine, a fuel pump 3 taking the fuel in a pressurization chamber 17 from a fuel intake passage 25 through an intake valve 26, pressurizing the fuel, and discharging thus pressurized fuel from a discharge valve 27 by a reciprocal motion of a plunger 15 inside a cylinder, an electromagnetic valve 28, formed in a relief passage 31 connecting the pressurization chamber 17 of the fuel pump 3 to the fuel intake passage 25, for controlling a discharge quantity by relieving the pressurized fuel inside the pressurization chamber 17 at the time of opening the injection valves, and a control means 13 applying a valve-opening signal to the electromagnetic valve 28, wherein a width of a time of the valve-opening signal, applied to the electromagnetic valve 28 from the control means 13, is always set at a constant with respect to a period of the reciprocal movement of the plunger 15, whereby a temperature of a coil can be suppressed without an influence of responsiveness of the electromagnetic valve, and a fuel pressure can be constantly and stably controlled.
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