Patent ID: 6378501
Filing Date: 2002-04-30
Classification: F02D

Abstract:
A device for controlling fuel pressure in a direct cylinder fuel injection engine comprising:various sensors for detecting the operating conditions of an engine; an injector for directly injecting fuel into a cylinder of said engine; a pump for feeding fuel to said injector; a conduit system for connecting said pump to said injector; a fuel pressure detecting means for detecting the fuel pressure acting on said injector; a fuel pressure varying means for adjusting said fuel pressure; and a control means for so controlling the fuel pressure by feedback that said fuel pressure is brought into agreement with a target fuel pressure; wherein said control means includes a means for controlling a fuel pressure correction amount by variably setting a control gain for controlling the fuel pressure by feedback; and said means for controlling the fuel pressure correction amount changes the control gain when said target fuel pressure has changed by more than a predetermined amount, from a first control gain to a second control gain different from the first control gain.