Air fuel ratio feedback controller

Abstract

Abstract PURPOSE: In the control of air fuel ratio by the delayed integrated output of an oxygen concentration signal, to highly clean up exhaust gas even at transient time, by using the signal of an idling stop timer and an engine's rotational frequency detection circuit to change delay time. CONSTITUTION: An oxygen concentration signal is compared 208 with a reference voltage to perform the feedback compensation of a fuel injection pulse signal of time width corresponding to the quantity of sucked air, through an integration circuit by outputs delayed by time TL or TR through a charge/discharge capacitor 308. A changeover switch S 1 is turned on to apply the voltage of a battery to a diode 305 or another changeover switch S 2 is turned on to fix a diode 306 at a reference voltage E 1 . These changeover switches S 1 , S 2 are selectively turned on or off to optionally change the delay times TL, TR for each other. To shift the switches S 1 , S 2 , preference is taken for a time signal produced by an idling stop timer and the rotational frequency is compared with a prescribed value. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Shiyuuzou Yoshida
• 👤 Hironobu Ono
• 👤 Masa Matsuo
• 👤 Koichi Hoshi
• 👤 Motoharu Sueishi
• 👤 Ichiro Ueda

Bibliographic Details