Exhaust purification system for multiple cylinder engines

Details Exhaust purification system for multiple cylinder engines Exhaust purification system for multiple cylinder engines

1992-03-30

1993-09-28

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 123688, 123691, 123692, F01N 320

Patent

active

052477932

ABSTRACT:
An exhaust purification system has an upstream exhaust gas sensor and a downstream exhaust gas sensor disposed downstream of a catalytic device. Each sensor detects an oxygen concentration in exhaust gases and provides an output which inverts between a lean state, representative of a lean air/fuel ratio, and a rich state, representative of a rich air/fuel ratio, according to oxygen concentrations. The upstream exhaust sensor is determined to have deteriorated when an output from the upstream exhaust sensor is kept in a predetermined correlation with an output from the downstream exhaust sensor while the output from the downstream exhaust sensor remains the same.

REFERENCES:
patent: 4177787 (1979-12-01), Hattori
patent: 4747267 (1988-05-01), Nagai
patent: 5074113 (1991-12-01), Matsuoka

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