Air-fuel ratio detection with variable detection range

Details Air-fuel ratio detection with variable detection range Air-fuel ratio detection with variable detection range

1996-07-29

1998-09-22

Tung, T.

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For oxygen or oxygen containing compound

204425, G01N 27407

Patent

active

058109978

ABSTRACT:
In an air-fuel ratio control of an engine, an oxygen sensor element is operated with an operating voltage for producing an electric current corresponding to an air-fuel ratio of mixture. The operating voltage is varied in accordance with a range of the air-fuel ratio to be detected, i.e., lean air-fuel ratio, stoichiometric air-fuel ratio or rich air-fuel ratio. The operating voltage may be varied in correspondence to the actual electric current produced from the sensing element or a target value of the air-fuel ratio to which the engine is feedback-controlled.

REFERENCES:
patent: 4472247 (1984-09-01), Rohr et al.
patent: 4601793 (1986-07-01), Asayama et al.
patent: 4626338 (1986-12-01), Kondo et al.
patent: 4759827 (1988-07-01), Okada et al.

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