Air-fuel ratio detection system

Details Air-fuel ratio detection system Air-fuel ratio detection system

1986-02-26

1988-01-05

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

204425, G01M 1500

Patent

active

047167602

ABSTRACT:
A novel air-fuel detection system is disclosed, comprising a solid electrolyte with a diffusion resistor for controlling the oxygen diffusion to measure the air excess rate of an exhaust gas. A predetermined current is supplied to the solid electrolyte for a predetermined length of time to apply the oxygen into the diffusion resistor. Subsequently, a predetermined current of opposite polarity is supplied to the solid electrolyte for a predetermined length of time to draw the oxygen out of the diffusion resistor. The time required from the start of drawing to generation of an electromotive force due to the difference in oxygen component pressures between the sides of the solid electrolyte is measured and the above operations are alternatively repeated in the time sharing manner to determine the air-fuel ratio.

REFERENCES:
patent: 3691023 (1972-09-01), Ruka et al.
patent: 3907657 (1975-09-01), Heijne et al.
patent: 4158166 (1979-06-01), Isenberg
patent: 4272331 (1981-06-01), Hetrick
patent: 4545889 (1985-10-01), Franx
patent: 4629535 (1986-12-01), Oyama et al.
Hetrick, R. E. et al., Oxygen Sensing . . . Pumping, SAE Technical Paper, No. 810433, Feb. 23, 1981, pp. 63-66.

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