Claims
- 1. A method for a VCT feed back control system, comprising the steps of:
a) providing a set of tooth pulses; b) filtering said set of tooth pulses; c) identifying a phaser that is not moving; d) determining whether the non-moving phaser is at stop state or steady state; and e) learning said phaser physical stop.
- 2. The method of claim 1 further comprising setting a high limit or a low limit when phaser is at stop state.
- 3. The method of claim 2 further comprising resetting a compensator.
- 4. The method of claim 2 further comprising resetting a PI controller.
- 5. The method of claim 1 further comprising setting e1 as the steady state value if the system is at steady state.
- 6. The method of claim 1, wherein said filtering step includes using a notch filter for reducing noise level.
- 7. A VCT feed back control system, comprising:
a) a variable force solenoid; b) a spool valve capable of being engaged by said solenoid; c) a VCT phaser disposed to determine a set of positions, wherein a set of relationships between a crank shaft and cam shaft is determined, said VCT phaser being controllable by positions of said spool; and d) a controller including:
a control law disposed to receive a set point and capable of controlling said variable force solenoid; a filter for filtering position signals of a rotating shaft; and an identifier for receiving the filtered position signal, identifying said VCT phaser state, and generate a reset signal to reset said control law.
- 8. The system of claim 7, wherein said set point is filtered.
- 9. The system of claim 7, wherein said control law includes a PI controller and a phase compensator each disposed to be reset separately.
- 10. The system of claim 7, wherein said VCT phaser state includes steady state and stop state.
REFERENCE TO RELATED APPLICATIONS
[0001] This application claims an invention which was disclosed in Provisional Application No. 60/389,192, filed Jun. 17, 2002, entitled “CONTROL METHOD FOR PREVENTING INTEGRATOR WIND-UP WHEN OPERATING VCT AT OR NEAR ITS PHYSICAL STOPS”. The benefit under 35 USC §119(e) of the U.S. provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60389192 |
Jun 2002 |
US |