Patent ID: 7017554

Claim:
A fuel supply device of an internal combustion engine comprising: a fuel pump including a plurality of pressure chambers each having a volume that is expanded and contracted by a power of the engine; a plurality of opening/closing valves corresponding to the plurality of pressure chambers for opening and closing the pressure chambers, including at least a first opening/closing valve and a second opening/closing valve for opening and closing a first pressure chamber and a second pressure chamber, respectively, wherein an expansion time and a contraction time of the first the first pressure chamber is different from that of at least the second pressure chamber, the fuel pump being operable to sealingly store fuel in the pressure chambers by closing the opening/closing valves and supply the fuel in the pressure chambers by contracting of the volumes of the pressure chambers; and a controller for setting closing times of the opening/closing valves in accordance with a required quantity of fuel to be force fed, wherein the controller freely switches between a normal control in which all of the plurality of pressure chambers sequentially force feed fuel and a thinned-out control in which the force fed fuel is thinned out by stopping the closing of the first opening/closing valve to place the fuel in the first pressure chamber in a non-pressurized state, while continuing the opening and closing of the second opening/closing valve so that the second pressure chamber force feeds fuel.