Anti-sticking and diagnostic strategy for exhaust system valves
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United States of America Patent
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Sep 30, 2014
Grant Date -
May 23, 2013
app pub date -
Nov 21, 2011
filing date -
Nov 21, 2011
priority date (Note) -
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Abstract
An engine system includes an exhaust system fluidly connected to an electronically controlled engine. Exhaust from the engine may travel a first pathway through a turbine of a turbocharger, or a second pathway that bypasses the turbine. An electronically controlled wastegate vale is biased to close the second pathway. An electronic controller is in communication with the electronically controlled engine and the electronically controlled wastegate valve. The electronic controller is configured to execute a wastegate diagnostic algorithm to detect a stuck closed default condition of the electronically controlled wastegate valve, and derate the engine in response to detection of a stuck closed fault condition.
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