Apparatus for controlling air/fuel ratio for internal combustion

Details Apparatus for controlling air/fuel ratio for internal combustion Apparatus for controlling air/fuel ratio for internal combustion

1985-06-20

1986-07-08

Wolfe, W. R.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, 123571, F02M 5100, F02M 2506

Patent

active

045986843

ABSTRACT:
In an internal combustion engine equipped with exhaust gas recirculation system, air/fuel ratio control is effected using various engine parameters including atmospheric pressure. To this end, basic fuel injection duration is first computed, and this basic fuel injection duration is corrected using a correction factor so that a desired air/fuel ratio is obtained irrespective of the change in atmospheric pressure. When EGR is performed a first correction factor is derived or calculated using engine speed data, intake pressure data and atmospheric pressure data. When EGR is not performed, a second correction factor is derived or calculated using atmospheric pressure data. When obtaining the first correction factor, interpolation is used to obtain the value thereof suitable for detected engine speed, intake pressure and atmospheric pressure.

REFERENCES:
patent: 4461263 (1984-07-01), Hasegawa
patent: 4488533 (1984-12-01), Sekiguchi et al.
patent: 4553518 (1985-11-01), Takao et al.

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