FUEL INJECTION AMOUNT CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To accurately control air-fuel ratio even if a valve overlap amount is abruptly changed by preventing the air-fuel ratio from being disturbed as shown in Fig. 14 (c) due to an abrupt change of valve overlap amount caused due to a change in the blowback state of internal EGR gas. SOLUTION: The model parameters of adhesive rates and evaporation rates for adhered fuel near a combustion chamber and adhered fuel at a position apart a specified distance from the combustion chamber are calculated as adhered fuel adhered to an intake port. A fuel injection amount is calculated by using these model parameters in inverse model of the Akino's model expression. In this case, since the model parameters are calculated based on the variable state of the internal EGR gas due to a change in valve overlapped amount, a displacement in air-fuel ration between a rich side and a lean side can be corrected as shown in Fig. 14 (e) to accurately control the air-fuel ratio.