Device for diagnosing oxygen sensor deterioration

Details Device for diagnosing oxygen sensor deterioration Device for diagnosing oxygen sensor deterioration

1997-10-03

1999-07-27

Solis, Erick R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123696, 73 2332, 731173, 60276, 60277, F02D 4114

Patent

active

059272600

ABSTRACT:
The air/fuel ratio of an engine is feedback controlled based upon the output of an oxygen sensor. The control includes proportional control and also correction of a control variable for this proportional control according to the actual air/fuel ratio. The period of the output signal of the oxygen sensor during feedback control is measured, a decision value is set corresponding to change in the control variable, and deterioration of the oxygen sensor is determined by comparing the period of the output signal with the decision value. By doing this, change in the control variable is prevented from exerting any influence upon the period of the output signal of the oxygen sensor, and the accuracy of deterioration diagnosis for the oxygen sensor is enhanced.

REFERENCES:
patent: 4402217 (1983-09-01), Higashiyama
patent: 4625698 (1986-12-01), Jamrog
patent: 5007398 (1991-04-01), Kashiwabara
patent: 5227975 (1993-07-01), Nakaniwa
patent: 5370101 (1994-12-01), Hamburg et al.
patent: 5610321 (1997-03-01), Shinmoto
patent: 5656765 (1997-08-01), Gray
patent: 5672817 (1997-09-01), Sagisaka et al.

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