Air-fuel ratio controller of engine

Abstract

Abstract PURPOSE:To change air-fuel ratio in an adequate condition at switching of a control system when a fixed control system at specific operation is switched to a feedback control system at normal operation, by providing a correcting means in which a control gain of the feedback control system is temporarily increased. CONSTITUTION:A control circuit 8 is constituted in such a manner that a timer 21 is provided and started when an operational condition-detector circuit 17 detects the switching from a specific operational condition to a normal oprational condition, after a prescribed time, the integrating coefficient of an integrator 13 is changed from K2 to K1, while at transfer from a fixed control system to a feedback control system, a control gain of the feedback control system is held higher for a certain time. In this way, when rich air-fuel ratio of fixed control, for instance, in a high loaded operational condition is switched to air-fuel ratio of feedback control in an normal operational condition, the air-fuel ratio can be changed in an adequate condition without causing the shocking change to an engine.

Inventors

• 👤 Takeshi Tsuchida
• 👤 土田　剛

Bibliographic Details