| 摘要 |
PROBLEM TO BE SOLVED: To improve control precision of air-fuel ratio control of variable valve system engine. SOLUTION: An opening closing timing is controlled (S1-S3) so that target torque of a suction and exhaust valve is generated based on accelerator opening and an engine rotation speed. A volumetric intake air amount is calculated based on an engine rotation speed and the opening and closing timing of the intake and exhaust valve (S4 and S5). The volumetric intake air amount is corrected by an intake air temperature T and an intake air pressure P (S6 and S7). Based on a mass intake air amount, a fuel injection amount Tpi is calculated (S8), various correction factors COEF and a battery voltage correction value Ts are read (S9), an air-fuel ratio feedback correction factorα, and an air-fuel ratio learning valueαL are read (S10), and based on the various correction amounts, a final fuel injection amount TIi is calculated (S11).
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