Measuring and testing – Simulating operating condition – Marine
Patent
1993-03-15
1994-10-25
Raevis, Robert
Measuring and testing
Simulating operating condition
Marine
G01M 1500
Patent
active
053577914
ABSTRACT:
Functionality of the exhaust gas oxygen sensor is determined by continually monitoring the exhaust gas oxygen sensor voltage to determine both a peak rich voltage and peak lean voltage. Based on the information after some predetermined time period, a system determines whether rich air/fuel ratio excursions are required and lean air/fuel ratio excursions are required. If a rich air/fuel excursion is required, then there is a command to decrease the air/fuel ratio to make it rich until the peak rich voltage is greater than a predetermined threshold voltage. Analogously, if a lean excursion is required, then there is a command to have a lean air/fuel ratio excursion done until the peak lean voltage is less than a predetermined threshold. If a time out happened before the peak rich voltage was greater than the rich threshold or the peak lean voltage was less than the lean threshold, then there is a determination that there is a malfunction detected on the sensor/circuit.
REFERENCES:
patent: 4928518 (1990-05-01), Tamura
patent: 4980834 (1990-12-01), Ikeda et al.
patent: 5080072 (1992-01-01), Husokai et al.
patent: 5097700 (1992-03-01), Nakane
patent: 5154054 (1992-10-01), Nakane et al.
patent: 5179924 (1993-01-01), Manaka
patent: 5212947 (1993-05-01), Fujimoto et al.
Gee Thomas S.
Schubert Thomas A.
Smith Paul F.
Squire Carl W.
Abolins Peter
Ford Motor Company
May Roger L.
Raevis Robert
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