Patent ID: 6810855
Filing Date: 2004-11-02
Classification: F02D,Y02T

Abstract:
A control device for a four-stroke engine having an intake valve between a combustion chamber and an intake port and having at least one intake control valve for one intake port of the combustion chamber, the control device comprising a pump for pressurizing a fuel in a fuel tank, a regulator opened to an atmospheric pressure for regulating an upper limit value for the fuel pressurized by the pump, a fuel injection device for injecting the fuel regulated an upper limit value thereof by the regulator into the intake port, intake pressure detecting unit for detecting an intake pressure between the intake control valve and the combustion chamber, at least either atmospheric pressure detecting unit for detecting an atmospheric pressure or pump delivery pressure detecting unit for detecting the pressure of the fuel pressurized by the pump, and fuel injection control unit for controlling the fuel injection device based on at least either of an atmospheric pressure detected by the atmospheric pressure detecting unit and a fuel pressure detected by the pump delivery pressure detecting unit and an intake pressure detected by the intake pressure detecting unit, wherein the intake pressure detecting unit detects an intake pressure a plurality of times while the four-stroke engine completes four strokes of intake stroke, compression stroke, expansion stroke and exhaust stoke, and the fuel injection control unit calculates a fuel injection time based on at least one of a plurality of intake pressure values detected by the intake pressure detecting unit so as to inject the fuel with an injection initiating timing according to the fuel injection time so calculated.