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

1987-02-03

1989-01-10

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

73 23, 204406, F02D 4114

Patent

active

047965878

ABSTRACT:
An air/fuel ratio control system for an internal combustion engine includes an oxygen concentration sensor for producing an output signal to indicate the concentration of oxygen in the engine exhaust gases, and a circuit for producing a discrimination signal which expresses the inherent error, due to manufacturing deviations, in the output signal of the oxygen concentration sensor. Compensation of the output signal from the oxygen concentration sensor is performed in accordance with the discrimination signal, to produce a compensated output signal which controls means for adjusting the air/fuel ratio of the mixture supplied to the engine. Accurate control of the air/fuel ratio is thereby achieved, irrespective of differences in the operating characteristics of oxygen concentration sensors due to manufacturing deviations.

REFERENCES:
patent: 4167925 (1979-09-01), Hosaka et al.
patent: 4306444 (1981-12-01), Hattori et al.
patent: 4324218 (1982-04-01), Hattori et al.
patent: 4391256 (1983-07-01), Sawada et al.
patent: 4665874 (1987-05-01), Kawanabe et al.

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