Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Patent
1996-06-04
1998-07-14
Dombroske, George M.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
73 2332, 731181, G01M 1500
Patent
active
057818789
ABSTRACT:
An oxygen sensor has a detecting device unit for outputting a sensor current such as a limiting current of which a value is constant even though a sensing voltage applied to the oxygen sensor changes in a limiting current generating region and corresponds to an air-fuel ratio of a combustion gas and a heater for heating the detecting device unit to keep a resistance of the detecting device unit even though the oxygen sensor is degraded. When the sensing voltage is changed to a second sensing voltage of a resistance governing region, a current peak occurs in the sensor current, and a peak current value is detected. Because the peak current value decreases as the oxygen sensor is gradually degraded, when the peak current value is lower than a degradation judging value, it is judged that the oxygen sensor is degraded. Therefore, the diagnosis of the degradation of the oxygen sensor can be performed with a high accuracy.
REFERENCES:
patent: 4419190 (1983-12-01), Dietz et al.
patent: 4543176 (1985-09-01), Harada et al.
patent: 5405521 (1995-04-01), Nakamori et al.
patent: 5547552 (1996-08-01), Hasegawa et al.
Mizoguchi Tomomichi
Okazaki Kazuhiro
Takami Masayuki
Dombroske George M.
Nippondenso Co. Ltd.
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