Oxygen sensor signal processing circuit for a closed loop air/fu

Details Oxygen sensor signal processing circuit for a closed loop air/fu Oxygen sensor signal processing circuit for a closed loop air/fu

1978-03-20

1980-03-04

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 32EA, 123 32EE, F02B 300

Patent

active

041911512

ABSTRACT:
A processing circuit for use in an internal combustion engine closed loop air/fuel mixture controller is responsive to the output of an oxygen sensor exposed to the exhaust gas output of the internal combustion engine to provide a signal that indicates the sense of the deviation of the oxidizing/reducing conditions of the engine exhaust gases from a predetermined condition (usually stoichiometry). The processing circuit compares the output signal from the oxygen sensor with a pair of reference levels to provide the signal that indicates the sense of the deviation of the condition of the exhaust gases from the predetermined condition and which is independent of the effects of the absolute levels of the oxygen sensor and independent of the variance between the sensor response to changing air/fuel ratios in one direction and to sensor response to changing air/fuel ratios in the opposite direction.

REFERENCES:
patent: 3973529 (1976-08-01), Wessel et al.
patent: 4019474 (1977-04-01), Nishimiya et al.
patent: 4019474 (1977-04-01), Nishimuya et al.
patent: 4029061 (1977-06-01), Asano
patent: 4088095 (1978-05-01), Aono
patent: 4116170 (1978-09-01), Anzai
patent: 4117815 (1978-10-01), Ikeura
patent: 4120269 (1978-10-01), Fujishiro
patent: 4131089 (1978-12-01), Fujishiro et al.
patent: 4132200 (1979-01-01), Asano et al.

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