Patent ID: 6499469
Filing Date: 2002-12-31
Classification: F01L,F02B,F02D,F02F,Y02T

Abstract:
A fuel injection control system for an internal combustion engine including intake cams and exhaust cams for opening and closing respective intake valves and exhaust valves, wherein a cam phase as a phase of at least one of each intake cam and each exhaust cam relative to a crankshaft is changeable, and at least one of the intake cam and the exhaust cam can be switched to one of a plurality of kinds of cams having respective profiles different from each other,the fuel injection control system comprising: an engine rotational speed-detecting module for detecting a rotational speed of said engine; a cam phase-detecting module for detecting the cam phase; an intake pipe pressure parameter-determining module for determining an intake pipe pressure parameter representative of an intake pipe pressure; a first parameter-determining module for determining a first parameter in dependence on the one of the plurality of cams to which the at least one of the intake cam and the exhaust cam is switched, the detected rotational speed of the engine, and the detected cam phase; a second parameter-determining module for determining a second parameter in dependence on the one of the plurality of cams to which the at least one of the intake cam and the exhaust cam is switched, the detected rotational speed of the engine, and the detected cam phase; and a fuel injection amount-calculating module for calculating an amount of fuel to be injected, by using a linear equation of the intake pipe pressure parameter, the linear equation having a slope of the first parameter and an intercept of the second parameter.