Oxidation catalyst fault diagnosis unit and oxidation catalyst fault diagnosis method and internal combustion engine exhaust purification apparatus
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United States of America Patent
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Apr 9, 2013
Grant Date -
Dec 23, 2010
app pub date -
Oct 14, 2008
filing date -
Feb 15, 2008
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Abstract
An oxidation catalyst fault diagnosis unit and fault diagnosis method. An oxidation catalyst fault diagnosis unit which performs fault diagnosis of an oxidation catalyst placed on the downstream side of the reduction catalyst, the oxidation catalyst fault diagnosis being equipped with a reducing agent dosage calculating portion that sets a dosage of the reducing agent such that a predetermined quantity of the ammonia flows out to the downstream side of the reduction catalyst, an oxidation efficiency calculating portion that obtains the efficiency with which the predetermined quantity of ammonia flowing out to the downstream side of the reduction catalyst is oxidized by the oxidation catalyst when the predetermined quantity of ammonia passes through the oxidation catalyst, and a fault determining portion that performs determination of whether or not the oxidation catalyst is faulty by comparing the oxidation efficiency with a predetermined reference value.
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