Air-fuel ratio control system for an automotive engine

Details Air-fuel ratio control system for an automotive engine Air-fuel ratio control system for an automotive engine

1988-08-16

1989-09-12

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123339, F02D 4108, F02D 4116

Patent

active

048649970

ABSTRACT:
An air-fuel ratio control system for idling operation of an automotive engine has an O.sub.2 -sensor for detecting oxygen concentration of exhaust gas and for producing a feedback signal, a feedback control system responsive to the feedback signal for controlling air-fuel ratio to a desired air-fuel ratio. An idle switch is provided for detecting idling operation of the engine and for producing an idle signal. A lookup table stores a learning coefficient for controlling an actual injection pulse width during idling of the engine. In response to the idle signal the learning coefficient in the lookup table is updated with a new learning coefficient. When a predetermined learning operation is completed, the operation of the feedback control system is interrupted.

REFERENCES:
patent: 4444168 (1984-04-01), Matsumura et al.
patent: 4602601 (1986-07-01), Kanai
patent: 4805578 (1989-02-01), Kikuchi et al.

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