Air-fuel ratio controller for internal combustion engine

Details Air-fuel ratio controller for internal combustion engine Air-fuel ratio controller for internal combustion engine

1986-03-07

1987-05-12

Wolfe, Jr., Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

F02M 5100

Patent

active

046640860

ABSTRACT:
An apparatus of controlling an air-fuel ratio for internal combustion engine, further comprising the steps of calculating a basic fuel injection duration based on an engine load and a rotational speed of the engine, obtaining a factor of air-fuel ratio feedback correction for allowing a fuel injection duration to perform a proportional-plus-integral action, based on an output of an oxygen sensor for detecting an residual oxygen concentration in an exhaust gas, calculating a mean value of said factor of air-fuel ratio feedback correction, varying a correction value by learning so that said mean value takes a value within a predetermined range centered at a predetermined value corresponding to a target air-fuel ratio, multiplying said mean value by said correction value, providing initial adjustment of load detection apparatus applied to said internal combustion engine for determining said basic fuel injection time duration in order to set said calculation result within said predetermined range, and obtaining the fuel injection duration based on said basic fuel injection duration, said factor of air-fuel ratio feedback correction and said correction value, thereby, to control the air-fuel ratio.

REFERENCES:
patent: 4478193 (1984-10-01), Watanabe
patent: 4498445 (1985-02-01), Hasegawa et al.
patent: 4517949 (1985-03-01), Ito et al.
patent: 4539958 (1985-09-01), Ito et al.
patent: 4542729 (1985-09-01), Yamato et al.
patent: 4570599 (1986-02-01), Hasegawa et al.
patent: 4589390 (1986-05-01), Wazaki et al.

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