System for feedback control of air-fuel mixing ratio in intake s

Details System for feedback control of air-fuel mixing ratio in intake s System for feedback control of air-fuel mixing ratio in intake s

1980-06-20

1982-11-23

Kaplan, G. L.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

204195S, F02D 3300, F02M 724

Patent

active

043599893

ABSTRACT:
A feedback control system using an oxygen-sensitive air/fuel ratio sensor which is disposed in induction passage for an IC engine downstream of a fuel supply device with the provision of an ignition means to burn a fractional portion of an air-fuel mixture in the induction passage such that the oxygen-sensitive sensor is exposed to a resultant combustion gas. The sensor is of the concentration cell type having a layer of solid electrolyte such as zirconia provided with two electrode layers, and constant DC current is supplied to this sensor to cause migration of oxygen ions through the solid electrolyte layer, whereby this sensor exhibits a slope output characteristic and can detect air/fuel ratios either above or below a stoichiometric ratio or exhibits an on-off characteristic and can detect the stoichiometric ratio depending on the intensity and flow direction of the current. Owing to reduced overall length of the closed-loop, this control system can accomplish correction of a deviated mixing ratio in a shortened period of time.

REFERENCES:
patent: 3616274 (1971-10-01), Eddy
patent: 4050425 (1977-09-01), Holleboom
patent: 4156413 (1979-05-01), Taplin
patent: 4207159 (1980-06-01), Kimura et al.
patent: 4212273 (1980-07-01), Maruoka
patent: 4217869 (1980-08-01), Masaki
patent: 4224113 (1980-09-01), Kimura et al.
patent: 4264425 (1981-04-01), Kimura et al.

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