Compensation method and apparatus for fuel injection amount during engine warm-up

An apparatus for compensating an amount of fuel injected into an engine, said apparatus comprising:

• sensor means for sensing engine conditions including an engine intake air, an engine revolution speed and an engine coolant temperature;
• computer means for computing a fuel injection amount in accordance with said engine conditions, said computer means computing a basic fuel injection amount in accordance with said engine intake air and correcting said basic fuel injection amount by a first warm-up fuel enrichment coefficient dependent on said engine coolant temperature during an engine warm-up period, and said computer means correcting further said basic fuel injection amount by a second warm-up fuel enrichment coefficient from a time said engine revolution speed falls below a predetermined speed after an engine starting to a time a first pretermined interval lapses after said engine starting during said engine warm-up period;
• and
• injection means for injecting fuel into said engine in accordance with said computed and corrected fuel injection amount.