Crowell & Morin gLLP
Control device for a high-pressure fuel supply system using variable displacement fuel pump with reduced power consumption
A high pressure fuel supply system includes: a high pressure fuel pump having a normally closed electromagnetic valve; and a controller 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 and the valve close signal having a time duration shorter than a valve close response time 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 alternately and periodically the valve close signal and valve open signal during the valve open period of the electromagnetic valve.
Hitachi, Ltd.
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Satoshi Hiroyuki Kenichiro
Usui Yamada Tokuo