| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high pressure fuel supply system of an engine, which can reduce the amount of heat generation in an electromagnetic valve with simple constitution without using a costly current control circuit. <P>SOLUTION: The high pressure fuel supply system is provided with a high pressure fuel pump which has a compression chamber of the fuel; a pressurizing member to feed under pressure the fuel in the compression chamber to a discharge passage; a high pressure fuel pump having a normal closed electromagnetic valve installed in a suction passage, compresses the fuel in the pressurizing chamber by the switching motion of the electromagnetic valve and the reciprocating motion of the pressurizing member; and a controller to calculate a valve opening signal and a valve closing signal to the electromagnetic valve based on the status quantity of the engine, and to supply a drive current to the electromagnetic valve. While the electromagnetic valve is opened, the controller applies the valve closing signal shorter than valve closing response time (refer to FIG. 3(5)), that is, the time after the valve closing signal application until the electromagnetic valve closing (refer to FIG. 3(2), (4)). While the electromagnetic valve is opened, the controller applies the valve closing signal and the valve opening signal alternately and periodically (refer to FIG. 3(2)). <P>COPYRIGHT: (C)2007,JPO&INPIT |
