Patent ID: 6612296
Filing Date: 2003-09-02
Classification: F02D

Abstract:
A control apparatus for an internal combustion engine, comprising:a starter driven for rotation upon starting operation of an internal combustion engine; a crank shaft directly coupled to said internal combustion engine for corotation therewith; a crank shaft disk rotatable in synchronism with said crank shaft; angular position detecting members provided with equidistance therebetween along an outer peripheral edge of said crank shaft disk so as to correspond to a plurality of crank angle positions of said internal combustion engine; dropout sections for forming unequidistance portions partially in said angular position detecting members so as to correspond to reference crank angle positions, respectively, of cylinders of said internal combustion engine; a crank angle sensor disposed in opposition to said angular position detecting members for generating crank angle pulse signals representing said crank angle positions; a cam shaft rotatable at a rotation ratio of 1/2 relative to said crank shaft; a cam shaft disk rotatable in synchronism with said cam shaft; cylinder identification information detecting members provided along an outer periphery of said cam shaft disk so as to make available cylinder identification information of said internal combustion engine; a cylinder identifying sensor disposed in opposition to said cylinder identification information detecting members for generating cylinder identifying pulse signals representing said cylinder identification information; and an electronic control unit for controlling each of said cylinders of said internal combustion engine on the basis of said crank angle pulse signals and said cylinder identifying pulse signals, wherein said electronic control unit includes: cylinder identifying means for discriminatively identifying each of said cylinders of said internal combustion engine by making use of said crank angle position based on said crank angle pulse signals and said cylinder identification information based on said cylinder identifying pulse signals; crank angle signal period arithmetic means for arithmetically determining input periods of said crank angle pulse signals as crank angle pulse signal periods; starter drive detecting means for detecting changeover of driving state of said starter; rotation speed detecting means for detecting rotation speed of said internal combustion engine; and cylinder identification information invalidating means responsive to changeover of said starter driving state between driving state and non-driving state in an operation state in which said crank angle pulse signal period is longer than a predetermined period and in which rotation speed of said internal combustion engine is lower than a predetermined speed, for thereby invalidating the cylinder identification information detected before changeover of said starter driving state to inhibit said cylinder identification information from being employed in a succeeding cylinder identification.