On-board vehicle diagnostic of an oxidation catalyst
OwnerMichael Parmentier, Julien Schmittinventors
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Abstract
There is presented a method for monitoring an oxidation catalyst in an exhaust line of an internal combustion engine, wherein a catalyst diagnostic event comprises a test cycle during which a conversion capability of the oxidation catalyst is determined based on the exotherm generated by post-injection of fuel. The diagnostic event may only be initiated when the temperature of the oxidation catalyst lies within a predetermined temperature range.
Claims17
A method for monitoring an oxidation catalyst in an exhaust line of an internal combustion engine, wherein a catalyst diagnostic event comprises a test cycle during which a conversion capability of said oxidation catalyst is determined based on an exotherm generated by post-injection of fuel,
- wherein said diagnostic event may only be initiated when the temperature of said oxidation catalyst lies within a predetermined temperature range,
- and wherein a post-injection event and an exotherm monitoring period that lasts, after said post-injection event, until essentially all of the heat stored in said oxidation catalyst has been evacuated.
Dependencies are inferred from the claim text.