Device for the control of an air-fuel ratio for an internal combustion engine

摘要

A device for the control of an air-fuel ratio for an internal combustion engine is disclosed, with an inlet control valve arranged downstream of a throttle valve and actuated independently of the throttle valve, which control valve is closed or opened in order to selectively regulate a swirl motion of air introduced into the engine according to a load condition of the engine, a quantity of fuel fed to the engine being calculated in the said device in accordance with a target air-fuel ratio on the basis of fundamental engine operating conditions including the engine load and speed, a feedback device being provided for controlling a value of the feedback correction variable, incorporated into the calculated fuel quantity, in accordance with a deviation of a fuel-air ratio detected by an air-fuel ratio sensor, when the engine is in a feedback condition, and a learning device being fitted for controlling a learning variable in accordance with the value of the feedback correction variable during the feedback condition, in order to adjust the calculated fuel quantity so as to reduce the effect of the feedback correction variable on the air-fuel ratio obtained. In the said device the learning device ... Original abstract incomplete.