Abnormality diagnosing apparatus for vehicle
First Claim
1. An abnormality diagnosing apparatus for a vehicle, comprising:
- an abnormality diagnosing means for diagnosing presence or absence of an abnormality in a vehicle component or vehicle system; and
a performance frequency calculating means for calculating a performance frequency of an abnormality diagnosis performed by said abnormality diagnosing means, wherein said abnormality diagnosing means changes at least one abnormality diagnosing condition selected from a performance condition, a diagnosing method, and a judging condition for the abnormality diagnosis according to the performance frequency calculated by said performance frequency calculating means.
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Abstract
A vehicle ECU performs abnormality diagnoses including a deterioration diagnosis for a catalyst, a leakage diagnosis for an evaporative gas purge system, an abnormality diagnosis for an EGR system, and an abnormality diagnosis for a secondary air introducing system. During abnormality diagnoses, the ECU calculates the performance frequency for each diagnosis. When the performance frequency has reached the required level, the ECU performs the abnormality diagnosis under the normal abnormality diagnosing condition (performance condition, diagnosing method, and judging condition) in order to not adversely affect exhaust emissions, vehicle drivability, etc. If the performance frequency has not reached the required level, the ECU performs the abnormality diagnosis by changing the abnormality diagnosing condition to emphasize an increase of the performance frequency of the abnormality diagnosis, thereby increasing the performance frequency of the abnormality diagnosis. Consequently, it is possible to maintain the performance frequency of the abnormality diagnosis for vehicle systems.
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Citations
15 Claims
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1. An abnormality diagnosing apparatus for a vehicle, comprising:
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an abnormality diagnosing means for diagnosing presence or absence of an abnormality in a vehicle component or vehicle system; and
a performance frequency calculating means for calculating a performance frequency of an abnormality diagnosis performed by said abnormality diagnosing means, wherein said abnormality diagnosing means changes at least one abnormality diagnosing condition selected from a performance condition, a diagnosing method, and a judging condition for the abnormality diagnosis according to the performance frequency calculated by said performance frequency calculating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification