Apparatus for learning control of air-fuel ratio of air-fuel mixture in electronically controlled fuel injection type internal combustion engine

摘要

PCT No. PCT/JP85/00024 Sec. 371 Date Aug. 8, 1985 Sec. 102(e) Date Aug. 8, 1985 PCT Filed Jan. 23, 1985 PCT Pub. No. WO85/03329 PCT Pub. Date Sep., 1985.In controlling the air-fuel ratio in an air-fuel mixture in an internal combustion engine, a pulse duty signal Tp corresponding to the basic fuel injection quantity is operated at least from the intake air flow quantity Q and the rotation speed N of the engine, a signal of a fuel injection quantity Ti corrected by adding an appropriate correction value to said Tp is applied to a pulse-controlled fuel injection apparatus. Feedback control is carried out so that the actually detected air-fuel ratio is made to follow the aimed air-fuel ratio, and the learning correction coefficient alpha o is operated by learning so that the correction coefficient for this feedback control is as small as possible and the operated value is given as a correction value to Tp. Since the reliability of alpha o is low in a driving state area where learning is not advanced, alpha o of the area where learning is not advanced is estimated from alpha o of areas where learning is advanced, whereby control of the air-fuel ratio in the transition stage between different areas is smoothened.