Deteriorated condition detecting apparatus for an oxygen sensor

Details Deteriorated condition detecting apparatus for an oxygen sensor Deteriorated condition detecting apparatus for an oxygen sensor

1977-07-14

1979-12-11

Lazarus, Ira S.

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

123 32EE, 123119EC, 60277, F02B 7510, F02B 7708

Patent

active

041777875

ABSTRACT:
An apparatus for detecting a deteriorated condition of an oxygen concentration sensor mounted in an exhaust pipe for an internal combustion engine for controlling an air-fuel ratio is described. The apparatus includes, in addition to the sensor, a reference oxygen concentration sensor mounted in the exhaust pipe downstream of a cleaning device, and a discrimination unit for determining the deterioration of the oxygen concentration sensor for controlling the air-fuel ratio by measuring at least one of a duty factor and a period of an output signal from the reference oxygen concentration sensor.

REFERENCES:
patent: 3962866 (1976-06-01), Neidhard et al.
patent: 3969932 (1976-07-01), Rieger et al.
patent: 4007589 (1977-02-01), Neidhard et al.
patent: 4088096 (1978-05-01), Bossi et al.

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