Patent ID: 7568469
Filing Date: 2009-08-04
Classification: F02D,F02M

Abstract:
1. A control device for controlling a high pressure fuel supply system comprising a high pressure fuel pump including a pressurizing chamber that communicates with a fuel suction passage and a fuel discharge passage a pressurizing member for sending pressurized fuel in said pressurizing chamber toward said discharge passage a discharge valve disposed in said discharge passage, and a normally closed electromagnetic valve disposed in said suction passage, fuel in said pressurizing chamber being compressed by an open/close operation of said electromagnetic valve and a reciprocal operation of said pressurizing member; said control device comprising: a controller for calculating a valve open signal and a valve close signal for said electromagnetic valve in accordance with an operating state of an engine, and for supplying a corresponding drive current to said electromagnetic valve for opening said normally closed electromagnetic valve during a valve open period; wherein, a discharge flow amount of said electro magnetic valve is determined by a duration of said valve open period; during said valve open period of said electromagnetic valve, said controller periodically applies a valve close signal for interrupting said drive current for a time duration that is shorter than a valve closing response time of said electromagnetic valve; and said valve close response time is a time required to close said electromagnetic valve when said valve close signal is applied, whereby said interruption of said drive current during said valve open period does not affect the discharge flow amount of said electromagnetic valve.