G - Physics – 05 – D
Patent
G - Physics
05
D
341/38.13
G05D 7/06 (2006.01) F02D 41/14 (2006.01) G05D 11/13 (2006.01)
Patent
CA 1078045
Abstract of the Disclosure 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 pre- determined 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 dif- ferential 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 un- symmetrical voltage which, when integrated, produces a bias voltage that shifts the air-fuel ratio to a value preferable for the transient engine operating conditions. - 1 -
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