SUCTION AIR VOLUME ESTIMATING DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

A throttle model (M2) estimates a throttle−passed air flow rate mt from an equation obtained based on the energy conservation law, the momentum conservation law, and the mass conservation law. A suction pipe model (M3) estimates an in−suction−pipe air pressure Pm and an in−suction−pipe air temperature Tm from an equation based on the mass conservation law and the energy conservation law. A suction valve model (M4) estimates an air flow rate mc passing around a suction valve from an equation obtained based on the energy conservation law, the momentum conservation law, the mass conservation law and a state equation. A cylinder model (M5) estimates an in−cylinder pressure Pc and an in−cylinder air temperature Tc from an equation based on the energy conservation law. These models permit an in−cylinder suction air volume Mc to be determined by calculation without using many table retrievals.