Measuring and testing – Simulating operating condition – Marine
Patent
1998-04-15
1999-09-07
Dombroske, George
Measuring and testing
Simulating operating condition
Marine
73 2331, 60276, 701109, F01N 320, F02D 4114, F02D 4500, G01M 1500
Patent
active
059489740
ABSTRACT:
The device for determining deterioration of a catalytic converter includes a catalytic converter disposed in the exhaust gas passage of the engine and an air-fuel ratio sensor disposed on the exhaust gas passage downstream of the catalytic converter. The device performs two types of determining operations based on the length of the output response curve of the downstream air-fuel ratio sensor, one is a deterioration determining operation which determines whether the catalytic converter has deteriorated and the other is a normal determining operation which determines whether the catalytic converter is normal. The device also estimates the temperature of the catalytic converter based on the operating condition of the engine, and sets a deterioration diagnosis intake air flow range and a normal diagnosis intake air flow range in accordance with the estimated temperature of the catalytic converter. The device performs the deterioration determining operation or the normal determining operation in accordance with whether the intake air flow rate of the engine is within the deterioration diagnosis range or the normal diagnosis range.
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Dombroske George
Toyota Jidosha & Kabushiki Kaisha
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