Fuel injector diagnostics in a variable displacement engine
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United States of America Patent
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May 7, 2019
Grant Date -
Aug 2, 2018
app pub date -
Feb 2, 2017
filing date -
Feb 2, 2017
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Abstract
Methods and systems are provided for diagnosing a degraded fuel injector delivering undesired additional fuel in a variable displacement engine. In one example, a method includes, responsive to an indication of a cylinder air-fuel imbalance, deactivating a subset of cylinders of a multi-cylinder engine, performing a power balance test to determine an output of each cylinder after a duration of deactivation, and indicating that a deactivated cylinder has a degraded fuel injector responsive to the output being lower than a threshold output.
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