Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
June 15, 2021
Patent Application Number
16405872
Date Filed
May 7, 2019
Patent Primary Examiner
Patent abstract
Systems and methods for determining operation of a cylinder deactivating/reactivating device are disclosed. In one example, a warm engine is rotated without being supplied fuel to determine the presence or absence of valve actuator degradation. Degraded valve actuators may be determined when there is a lack of a temperature rise in the engine exhaust system.
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