Air-to-fuel ratio detector for engines

Details Air-to-fuel ratio detector for engines Air-to-fuel ratio detector for engines

1984-10-12

1986-05-06

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

204406, 204407, 204421, 204426, F02B 3300

Patent

active

045864764

ABSTRACT:
An air-to-fuel ratio detector for detecting the air-to-fuel ratio of the combustible mixture supplied to an engine on the basis of the concentration of oxygen gas in the exhaust gas of the engine, comprising an air-to-fuel ratio sensor provided to detect the oxygen gas concentration in the exhaust gas and consisting of an oxygen pump and an oxygen sensor which are disposed with a minute gap therebetween, and changeover means for simultaneously changing the direction of the pump current supplied to the oxygen pump and the polarity of the detection output signal given by the oxygen sensor; thereby capable of obtaining an air-to-fuel ratio detection signal when the operating air-to-fuel ratio is either in the rich air-to-fuel region or in the lean air-to-fuel region with respect to the stoichiometric air-to-fuel ratio.

REFERENCES:
patent: 4224113 (1980-09-01), Kimura
patent: 4226692 (1980-10-01), Isenberg
patent: 4272329 (1981-06-01), Hetrick et al.
patent: 4334510 (1982-06-01), Croset
Oxygen Sensing by Electrochemical Pumping-Hetrick et al., Appl. Phys. Lett. 38(5), Mar. 1, 1981.

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