Diagnostic methods and systems for active fuel management systems
AssigneeGM Global Technology Operations LLC
InventorsMike M. Mc Donald, William C. Albertson
Life of this patent
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Abstract
A diagnostic system for an active fuel management (AFM) solenoid of an internal combustion engine is provided. The system includes: a command module that selectively commands a solenoid signal to energize and de-energize the AFM solenoid, a timer module that activates a timer based on a status of the solenoid signal, and a fault module that selectively diagnoses a fault of the AFM solenoid based on the timer and a knock sensor signal.
Claims19
A diagnostic system for an active fuel management (AFM) solenoid of an internal combustion engine, comprising:
- a command module that selectively commands a solenoid signal to energize and de-energize the AFM solenoid;
- a timer module that activates a timer based on a status of the solenoid signal;
- and
- a fault module that selectively diagnoses a fault of the AFM solenoid based on the timer and a knock sensor signal.
An active fuel management (AFM) engine diagnostic system, comprising:
- a lifter oil manifold assembly (LOMA) solenoid that controls hydraulic fluid to and from a valve lifter;
- a knock sensor that generates an impact signal based on an operation of the LOMA solenoid;
- and
- a control module that commands a LOMA solenoid signal, begins a timer after commanding the solenoid signal, and selectively diagnoses a fault of the LOMA solenoid based on the impact signal and the timer.
A method of diagnosing an active fuel management (AFM) solenoid of an internal combustion engine, comprising:
- selectively commanding a solenoid signal to energize and de-energize the AFM solenoid;
- activating a timer based on a status of the solenoid signal;
- monitoring a knock sensor signal;
- and
- selectively diagnosing a fault of the AFM solenoid based on the timer and the knock sensor signal.
Dependencies are inferred from the claim text.