Various methods for estimating electric actuator temperature during certain operational windows are provided. In one example, a method comprises adjusting an electric motor to position a wastegate at a desired wastegate position, while during selected conditions, deviating from the desired position
Various methods for estimating electric actuator temperature during certain operational windows are provided. In one example, a method comprises adjusting an electric motor to position a wastegate at a desired wastegate position, while during selected conditions, deviating from the desired position by at least one full half-turn of the motor and indicating motor temperature based on winding resistance averaged over the full half-turn.
대표청구항▼
1. A method of controlling an electric wastegate actuator of a turbocharger in an internal combustion engine having a controller having non-transitory computer-readable storage medium, comprising: determining a desired wastegate actuator position via the controller; andadjusting an electric motor in
1. A method of controlling an electric wastegate actuator of a turbocharger in an internal combustion engine having a controller having non-transitory computer-readable storage medium, comprising: determining a desired wastegate actuator position via the controller; andadjusting an electric motor in responsive to the desired wastegate actuator position being determined via the controller,wherein while adjusting the electric motor is further in responsive to any one of a determination of during selected conditions, deviating the wastegate actuator from the desired position by at least one full half-turn of the motor, and indicating a motor temperature determined based on winding resistance averaged over the full half-turn during the deviating via the controller. 2. The method of claim 1, further comprising compensating boost variation due to the deviation by adjusting an intake throttle, and wherein the deviating occurs only during the determined selected conditions. 3. The method of claim 1, wherein the selected conditions include maximum boost in which the wastegate actuator is placed at a fully closed position. 4. The method of claim 1, wherein the selected conditions include minimum boost in which the wastegate actuator is placed at a fully open position. 5. The method of claim 1, wherein during the selected conditions the desired wastegate actuator position is a constant partial lift. 6. The method of claim 1, wherein the selected conditions include the wastegate actuator approaching a fully closed position, the wastegate actuator including a wastegate valve coupled to the electric motor via a four-bar linkage. 7. The method of claim 6, wherein the selected conditions further include the wastegate actuator approaching the fully closed position at less than a threshold speed, the wastegate valve being moved through a full range via ten or more full turns of the electric motor. 8. The method of claim 1, wherein the selected conditions include the desired wastegate actuator position changing by less than a first threshold over a full rotation of the motor, the full rotation being at a speed less than a second threshold. 9. The method of claim 1, further comprising determining the winding resistance based on a voltage and current supplied to the motor. 10. The method of claim 1, wherein the winding resistance averaged over the full half-turn includes a plurality of winding resistances each associated with a respective motor position and stored in a data structure. 11. The method of claim 10, further comprising if the motor temperature exceeds a threshold, reducing current supplied to the motor. 12. The method of claim 11, wherein reducing the current supplied to the motor includes ceasing supply of the current to the motor. 13. The method of claim 1, further comprising if the motor temperature exceeds a threshold, warning a vehicle operator via a dashboard indicator. 14. The method of claim 1, further comprising if the motor temperature exceeds a threshold, indicating motor temperature based at least on one new winding resistance after a threshold duration has passed. 15. A method controlling an electric wastegate actuator of a turbocharger in an internal combustion engine having a controller having non-transitory computer-readable storage medium, comprising: during a steady-state boost condition, adjusting a rotor of an electric wastegate actuator throughout at least a portion of a rotational range and measuring a voltage and a current corresponding to at least two rotor positions in the rotational range via the controller;estimating a winding resistance of the electric wastegate actuator by averaging the voltages and currents corresponding to the at least two rotational rotor positions via the controller;estimating a temperature of the electric wastegate actuator based on the estimated winding resistance via the controller;reducing the current supplied to the electric wastegate actuator via the controller; andactuating the electric wastegate actuator to maintain a wastegate valve in a position of a non-zero level of boost via the controller. 16. The method of claim 15, wherein the steady-state boost condition includes supply of maximum boost or approach to the maximum boost. 17. The method of claim 15, wherein the steady-state boost condition corresponds to a constant partial lift of a wastegate valve, the wastegate valve coupled to the electric wastegate actuator through a four-bar linkage, the wastegate valve being moved through a full range via ten or more full turns of the rotor. 18. The method of claim 15, further comprising ceasing supply of a current supplied to the electric wastegate actuator responsive to the temperature exceeding a threshold. 19. A method controlling an electric wastegate actuator of a turbocharger in an internal combustion engine having a controller having non-transitory computer-readable storage medium, comprising: for durations in which a desired wastegate actuator position is constant, adjusting a wastegate actuator based on the desired wastegate actuator position via the controller;after the wastegate actuator is adjusted to the desired wastegate actuator position, altering an actual wastegate actuator position through a rotational range of the wastegate actuator even though the desired wastegate actuator position is maintained constant via the controller;determining a temperature of the wastegate actuator based on resistance measurements sampled at a plurality of actual wastegate actuator positions in the rotational range via the controller; andadjusting an electric current supply in response to the temperature of the wastegate actuator having been determined via the controller. 20. The method of claim 19, further comprising: ceasing the electric current supply to the wastegate actuator if the determined temperature of the wastegate actuator exceeds a threshold temperature via the controller;determining a new temperature of the wastegate actuator based on at least one new resistance measurement after a threshold duration has passed via the controller; andadjusting the electric current supply based on/in response to the new temperature of the wastegate actuator having been determined via the controller.
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이 특허에 인용된 특허 (2)
Wilhelm,Daniel D.; White,Gregory R.; Wu,Charles, Actuator control system.
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