Method and apparatus for air-fuel ratio and torque control for a

Details Method and apparatus for air-fuel ratio and torque control for a Method and apparatus for air-fuel ratio and torque control for a

1994-12-14

1996-05-14

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

123683, F02D 4114

Patent

active

055158285

ABSTRACT:
An electronic engine controller (EEC) controls transient engine operation by generating a desired torque value which is indicative of an engine torque desired by a driver of the vehicle and by generating a desired air/fuel ratio value which is indicative of a desired air/fuel ratio to be combusted by the engine. The EEC also generates an actual torque value which is indicative of the actual engine torque and an actual air/fuel value which is indicative of the air/fuel ratio actually combusted by the engine. The actual A/F may be the output of a standard, switching type EGO sensor. An air/fuel difference value indicative of the difference between the actual air/fuel value and the desired air/fuel value is generated, and a torque difference value, indicative of the difference between the actual torque value and the desired torque value is generated. The air flow rate and the fuel flow rate into cylinders of the engine is calculated respectively as a function of the torque difference value and the air/fuel difference value. The engine may take one of many forms, including an engine where air flow and fuel flow rates may be controlled individually on a cylinder to cylinder basis.

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