Abnormality diagnostic method for internal combustion engine and abnormality diagnostic device for internal combustion engine
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United States of America Patent
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Feb 27, 2024
Grant Date -
Oct 26, 2023
app pub date -
Mar 2, 2020
filing date -
Mar 2, 2020
priority date (Note) -
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Abstract
During a predetermined operation state in which the opening degree of a throttle valve is fixed, an air flow meter positioned more on the upstream side than a pressure control valve detects a first intake air amount when the opening degree of the pressure control valve positioned on the upstream side of the throttle valve is set to a predetermined first valve opening degree and a second intake air amount when the opening degree of the pressure control valve is set to a predetermined second valve opening degree smaller than the first valve opening degree. On the basis of the first intake air amount and the second intake air amount, a diagnosis is made regarding whether there is an abnormality in a first pipe, a second pipe, a third pipe and the like which are included in a blow-by gas recirculation system for blow-by gas treatment.
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