Patent ID: 6016794
Filing Date: 2000-01-25
Classification: F02D

Abstract:
A fuel injection control apparatus for an internal combustion engine, comprising:a throttle actuator including a throttle valve for adjusting a drawn air amount to be drawn into said internal combustion engine;an injector for adjusting a fuel injection amount to be injected to said internal combustion engine;various sensors for detecting a driving state of said internal combustion engine; anda control unit for calculating control amounts of said throttle actuator and said injector in accordance with said driving state; whereinsaid various sensors include:a throttle opening degree sensor for detecting an operating amount of said throttle valve as a throttle opening degree;an accelerator pedal opening degree sensor for detecting a depression amount of an accelerator pedal as an accelerator pedal opening degree; anda crank angle sensor for detecting a crank angle signal indicative of a crank angle reference position for every cylinder;said control unit calculates a target throttle opening degree corresponding to the control amount of said throttle actuator based on said accelerator pedal opening degree, and includes:a throttle control apparatus for controlling an opening degree of said throttle valve toward said target throttle opening degree;engine revolution number detecting means for calculating the engine revolution number based on said crank angle signal; andan injector control apparatus for calculating a target fuel injection amount corresponding to the control amount of said injector based on said engine revolution number and said throttle opening degree, and for controlling the fuel injection amount of said injector toward said target fuel injection amount; and whereinsaid injector control apparatus includes:expected engine revolution number calculating means for calculating the expected engine revolution number for a predetermined interval based on said engine revolution number;expected throttle opening degree calculating means for calculating an expected throttle opening degree for said predetermined interval based on said throttle opening degree;expected drawn air amount calculating means for calculating an expected drawn air amount for said predetermined interval based on said expected engine revolution number and said expected throttle opening degree; andtarget fuel injection amount calculating means for calculating said target fuel injection amount based on said expected drawn air amount.