Measuring and testing – Simulating operating condition – Marine
Reexamination Certificate
2005-06-14
2005-06-14
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Simulating operating condition
Marine
Reexamination Certificate
active
06904792
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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“Attachment II: Modifications to Malfunction and Diagnostic System Requirements for 2004 and Subsequent Model-Year Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles and Engines (OBD II), Section 1968.2, Title 13, California Code Regulations”, Mar. 8, 2002, p. 10.
Davis Octavia
Denso Corporation
Lefkowitz Edward
Nixon & Vanderhye P.C.
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