Learning control of air-fuel ratio of internal-combustion engine

Abstract

Abstract PURPOSE:To prevent learing memorization with erroneous value by prohibiting learning memorization of the corrected value of an air-fuel ratio when the temperature of an O2 sensor increases, in said learning memorization of the corrected value which is corrected according to the difference between the real air-fuel ratio and the aimed air-fuel ratio, when the air-fuel ratio feedback conditions are satisfied. CONSTITUTION:In the captioned control, the basic injection amount which is obtained from each output of an air flow meter 12 and a revolution angle sensor 32 is corrected according to the output of a cooling water temperature sensor 34, in a digital control circuit 38. When the air-fuel ratio feedback conditions are satisfied, the air-fuel ratio is feedback-controlled according to the difference between the air-fuel ratio obtained from the output of an O2 sensor 26 and the aimed air-fuel ratio, and the corrected value of air-fuel ratio is learning-memorized. Said corrected memory value is used when the air- fuel ratio is feedback-controlled when the feedback conditions are not satisfied. With such a constitution, when the temperature rise of the O2 sensor 26 is foreseen, the feedback control of air-fuel ratio and learning memorization of the corrected value of air- fuel ratio are prohibited.

Inventors

• 👤 Toshio Suematsu
• 👤 末松　敏男
• 👤 Yuji Takeda
• 👤 武田　勇二
• 👤 Yoshiyasu Ito
• 👤 嘉康 伊藤

Bibliographic Details