Determining sliding camshaft actuator pin position based on engine crankshaft angle
AssigneeGM Global Technology Operations LLC
InventorsTimothy P Philippart, Douglas R Verner, Dimitri Karatsinides, Timothy Karnjate
Life of this patent
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Abstract
A method of determining a sliding camshaft actuator pin position based on engine crankshaft angle includes commanding a sliding camshaft actuator to perform a valve step shift, and monitoring an actuator's pin position during the valve step shift command. At least one crank angle is measured when the actuator pin position reaches or exceeds at least one predetermined pin position threshold and at least one remedial action is performed when the actuator pin position does not correlate to the at least one measured crank angle.
Claims19
A method of determining a sliding camshaft actuator pin position based on engine crankshaft angle comprising:
- commanding a sliding camshaft actuator to perform a valve step shift;
- monitoring an actuator pin position during the valve step shift command;
- measuring at least one crank angle when the actuator pin position reaches or exceeds at least one predetermined position threshold;
- and
- performing at least one remedial action when the actuator pin position does not correlate to the at least one measured crank angle at least two consecutive times.
A method of determining a sliding camshaft actuator pin position based on engine crankshaft angle comprising:
- commanding a sliding camshaft actuator to perform a valve step shift;
- monitoring an actuator pin position during the valve step shift command;
- measuring a first crank angle when the actuator pin position extends to greater than or equal to a first predetermined position threshold;
- measuring a second crank angle when the actuator pin position extends to greater than or equal to a second predetermined position threshold;
- measuring a third crank angle when the actuator pin position retracts to less than or equal to a third predetermined position threshold;
- and
- performing at least one remedial action when the actuator pin position does not correlate to the at least one measured crank angle.
A method of determining a sliding camshaft actuator pin position based on engine crankshaft angle comprising:
- commanding a sliding camshaft actuator to perform a valve step shift;
- monitoring an actuator pin position during the valve step shift command;
- measuring a first crank angle when the actuator pin position extends to greater than or equal to a first predetermined position threshold;
- measuring a second crank angle when the actuator pin position extends to greater than or equal to a second predetermined position threshold;
- measuring a third crank angle when the actuator pin position retracts to less than or equal to a third predetermined position threshold;
- and
- performing at least one remedial action when the actuator pin position does not correlate to the at least one measured crank angle, or when the actuator pin position does not reach or exceed at least one predetermined position threshold.
Dependencies are inferred from the claim text.