Adaptive control device for the air/fuel ratio for an internal combustion engine

摘要

A percentage of injected fuel adhering to a surrounding section of an intake valve is determined in accordance with a fluctuating value of an air/fuel ratio correction coefficient and with a fluctuating value of an output signal of an air/fuel ratio detector or an oxygen-quantity sensor. Each percentage of injected fuel adhering is divided up and each value stored in a sub-region of a characteristic memory map of a control unit. The percentage of injected fuel adhering is stored in a memory of the control unit and determined from the characteristic memory map in accordance with the instantaneous throttle-valve opening angle and the instantaneous temperature of the engine cooling water. The main percentage of the injected fuel is obtained by means of a learning control process in the control unit. An air/fuel ratio correction in a transition period is thus carried out with continuous variation.