Air/fuel ratio detector

Details Air/fuel ratio detector Air/fuel ratio detector

1985-12-10

1988-09-13

Castel, Benoit

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204407, 204412, 123440, 422 94, 422 98, G01N 2756

Patent

active

047707585

ABSTRACT:
An air/fuel ratio detector includes an exhaust diffusion chamber having one wall formed by an oxygen pump and another wall formed by an oxygen-concentration difference-actuated electrochemical cell that generates an oxygen differential signal corresponding to the difference in oxygen concentration between exhaust gas in the diffusion chamber and the ambient atmosphere. The differential signal is compared to a reference signal and the difference is used to control a current supplied to the oxygen pump in order to control the oxygen concentration in the exhaust gas. The current level is an indication of the existing air/fuel ratio.

REFERENCES:
patent: 4272329 (1981-06-01), Hetrick et al.
patent: 4450065 (1984-05-01), Yamada et al.
patent: 4586476 (1986-05-01), Asayama et al.
patent: 4615787 (1986-10-01), Yamada et al.
Hetrick et al., Oxygen Sensing by Electrochemical Pumping, Mar. 1, 1981, Appl. Phys. Lett., 38(5), pp. 390-392.

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