Method of evaluating air-fuel ratio sensor and apparatus therefo

Details Method of evaluating air-fuel ratio sensor and apparatus therefo Method of evaluating air-fuel ratio sensor and apparatus therefo

1990-07-02

1991-07-02

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

436160, G01M 1900

Patent

active

050276468

ABSTRACT:
A method of evaluating properties of an oxygen sensor used for detecting air-fuel ratio of exhaust gas from internal combustion engine comprises steps of preparing a burnt gas having a predetermined excess air ratio, supplying additional oxidation gas and/or reduction gas into the burnt gas, and detecting an output from the sensor exposed to the mixed gas flow. The supply amount of the additional gas is increased and decreased with a frequency of at least 10 Hz, and a ratio of a supply increasing period to a supply decreasing period is changed to change the supply amount of the additional gas, so that an excess air ratio .lambda. can be controlled similarly to exhaust gas from an actual engine.

REFERENCES:
patent: 4878380 (1989-11-01), Goodman
patent: 4878381 (1989-11-01), Moser et al.

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