ABNORMALITY DIAGNOSIS DEVICE AND EXHAUST GAS PURIFICATION DEVICE OF INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Jul 9, 2015
app pub date -
Jun 20, 2013
filing date -
Jun 28, 2012
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Abstract
An abnormal diagnosis device capable of specifying abnormality of an ammonia slip catalyst provided on a downstream side of a selection reduction catalyst, and an exhaust gas purification device of an internal combustion engine including the abnormal diagnosis device are provided. A purification rate diagnosis unit which diagnoses an NOx purification rate in the exhaust gas purification device, and an abnormality determination unit which specifies abnormality of the ammonia slip catalyst based on a diagnostic result of the NOx purification rate obtained at the time of a high load operation of the internal combustion engine and a diagnostic result of the NOx purification rate obtained at the time of a low load operation of the internal combustion engine are provided.
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