Internal-combustion engines – Noncompression
Patent
1976-05-17
1978-05-09
Cox, Ronald B.
Internal-combustion engines
Noncompression
123119EC, 60285, F02M 700, F02B 300
Patent
active
040880958
ABSTRACT:
A closed-loop mixture control system for an internal combustion engine comprises an exhaust composition sensor generating an output whose waveform is nonlinear and substantially symmetrical with respect to a predetermined air-fuel ratio, a differential amplifier connected to the composition sensor for comparison with a reference voltage which is variable in accordance with the engine operating parameters, and an integral controller for integrating the output from the differential amplifier. The differential amplifier output is normally symmetrical with respect to a predetermined value of the reference voltage to control the air-fuel ratio at a desired value that corresponds to the maximum conversion efficiency of a catalytic converter. Under transient conditions, the reference voltage is varied so that the differential amplifier generates an unsymmetrical voltage which, when integrated, produces a bias voltage that shifts the air-fuel ratio to a value preferable for the transient engine operating conditions.
REFERENCES:
patent: 3745768 (1973-07-01), Zechnall
patent: 3831564 (1974-08-01), Schmidt
patent: 3986352 (1976-10-01), Casey
Cox Ronald B.
Nissan Motor Company Limited
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