US Patent 7886521 Diagnosis device of exhaust purification catalyst
Patent 7886521 was granted and assigned to Denso on February, 2011 by the United States Patent and Trademark Office.
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An exhaust purification catalyst diagnosis device for diagnosing a degree of performance degradation of a NOx catalyst, which is provided in an exhaust system of an engine for exhaust purification, has a program that determines whether temperature of the NOx catalyst is within a predetermined diagnosis permission range before catalyst diagnosis processing and a program that controls the temperature of the NOx catalyst into the diagnosis permission range before the catalyst diagnosis processing if it is determined that the temperature of the NOx catalyst is outside the diagnosis permission range. Thus, the exhaust purification catalyst diagnosis device can perform the catalyst diagnosis processing frequently with high reliability and high accuracy, while maintaining suitable emission.
US Patent 07886521 Diagnosis device of exhaust purification catalyst US Patent 7886521 Diagnosis device of exhaust purification catalyst
US Patent 07886521 Diagnosis device of exhaust purification catalyst
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