| 摘要 |
A high pressure fuel supply system has: a high pressure fuel pump (1) including a pressurizing chamber (12) for fuel, a pressurizing member (2) for sending fuel in the pressurizing chamber toward a discharge passage in a pressurizing manner, and a normally closed electromagnetic valve (8) disposed in a suction passage, wherein fuel in the pressurizing chamber is compressed by an open/close operation of the electromagnetic valve and a reciprocal operation of the pressurizing member; and a controller (57) for calculating a valve open signal and a valve close signal for the electromagnetic valve in accordance with a state amount of an engine, and supplying a drive current to the electromagnetic valve, wherein the controller applies (Figs. 3B and 3D) and the valve close signal having a time duration shorter than a valve close response time (Fig. 3E) during a valve open period of the electromagnetic valve, the valve close response time being a time taken to close the electromagnetic valve after the valve close signal is applied. The controller applies (Fig. 3B) alternately and periodically the valve close signal and valve open signal during the valve open period of the electromagnetic valve. |
