Air-Fuel ratio control system for internal combustion engine

Details Air-Fuel ratio control system for internal combustion engine Air-Fuel ratio control system for internal combustion engine

1987-10-22

1989-02-21

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123339, F02D 4114, F02D 4116

Patent

active

048055786

ABSTRACT:
An air-fuel ratio control system realized with a computer for an internal combustion engine is disclosed, wherein an idle discriminator unit discriminates whether the internal combustion engine is idle or not, and when it is idle, an idle air-fuel ratio compensation amount determining unit decides an air-fuel ratio compensation amount in accordance with an output of an air-fuel ratio detector. When the engine is not idle, on the other hand, a non-idle air-fuel ratio compensation amount determining unit decides an air-fuel ratio compensation amount. The idle air-fuel ratio compensation amount determining unit includes a rich-lean discriminator unit for discriminating whether the air-fuel ratio is on lean or rich side in accordance with the output of the idle discriminator unit, a skip unit for skipping the air-fuel ratio compensation amount to a greater degree than in non-idle state when the rich-lean discriminator unit decides that the air-fuel ratio has shifted from lean to rich side or the opposite way, a hold unit for holding the compensation amount after skip for a predetermined length of time, and an integrator for integrating the compensation amount upon the lapse of the predetermined length of time.

REFERENCES:
patent: 3831564 (1974-08-01), Schmidt et al.
patent: 4508075 (1985-04-01), Takao et al.
patent: 4708109 (1987-11-01), Takao

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