Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
October 16, 2018
Patent Application Number
14788128
Date Filed
June 30, 2015
Patent Citations Received
0
...
Patent Primary Examiner
Patent abstract
Methods and systems are provided for performing an onboard cylinder leakdown test in response to an indication of cylinder misfire. In one example, following an engine-off event and an engine temperature above a threshold, fuel is injected into the indicated cylinder under conditions wherein the cylinder is expected to be sealed, and the detection of hydrocarbon migration out of the cylinder indicates cylinder degradation. In this way, cylinder degradation may be accurately diagnosed without intrusive, time consuming, and difficult off-board cylinder leakdown tests.
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