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A swing door actuation system for moving a door about a pivot axis between open closed positions relative to a vehicle body. The system includes a power swing door actuator having a housing connectable to one of the swing door and the vehicle body, an extensible member that moves relative to the hou

A swing door actuation system for moving a door about a pivot axis between open closed positions relative to a vehicle body. The system includes a power swing door actuator having a housing connectable to one of the swing door and the vehicle body, an extensible member that moves relative to the housing, and connects to the other of the swing door and the vehicle body, a motor connected to a gear train, and a normally engaged clutch. The motor is operatively connected to a clutch input end through the gear train. The output end is operatively connected to the extensible member. The clutch is disengageable to disconnect the motor from the extensible member. The clutch has a slip torque that is sufficiently high to prevent movement of the door when the door is exposed to less than a selected external torque and the motor is stopped.

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1. A method for controlling a swing door actuation system for moving a vehicular swing door relative to a vehicle body, wherein the actuation system includes an extensible member connected to the swing door or the vehicle body, a motor, a clutch operatively connected to the motor and the extensible

1. A method for controlling a swing door actuation system for moving a vehicular swing door relative to a vehicle body, wherein the actuation system includes an extensible member connected to the swing door or the vehicle body, a motor, a clutch operatively connected to the motor and the extensible member, comprising the steps of: engaging the clutch to couple the motor to the extensible member and move the extensible member in response to an indication that a user wishes to initiate a powered opening or powered closing of the swing door;disengaging the clutch to uncouple the motor from the extensible member in response to an indication that the user wishes to manually move the swing door;sending a signal from an actuated manual movement switch to a control system providing the indication that the user wishes to manually move the swing door, wherein the control system is configured to disengage the clutch in response to receipt of the signal from the actuated manual movement switch;sensing movement of the extensible member at a time when the motor is unpowered and sending a signal from a position sensor to the control system indicating that the user wishes to manually move the swing door in response to movement of the extensible member; andsending a manual movement signal to the control system in response to sensing that the motor is urged at a speed greater than a threshold design speed. 2. The method of claim 1, wherein the step of engaging the clutch is conducted without the application of electrical power to the clutch. 3. The method of claim 1, wherein the step of disengaging the clutch includes applying electrical power to the clutch. 4. The method of claim 1 including sending signals to a control system indicative of whether the user desires to initiate a powered opening or a powered closing of the swing door, wherein the control system is configured to engage the clutch to drive the motor to move the swing door in response to indication that the user wishes to initiate a powered opening or powered closing of the swing door. 5. The method of claim 4, wherein the signals are sent from a key fob, a dashboard mounted push button control, or manual activation of a door latch opening lever. 6. The method of claim 1 including actuating a door opening lever to actuate the manual movement switch. 7. The method of claim 1 including sending signals from a current sensor to the control system that are indicative of the amount of electrical current drawn by the motor. 8. A method for controlling a swing door actuation system for moving a vehicular swing door relative to a vehicle body, wherein the actuation system includes an extensible member connected to the swing door or the vehicle body, a motor, and a clutch operatively connected to the motor and the extensible member, comprising the steps of: operatively connecting the motor to the extensible member using the clutch without the application of electrical power to the clutch,operatively disconnecting the motor from the extensible member using the clutch with the application of electrical power to the clutch, andpreventing movement of the extensible member and the swing door using the clutch when the swing door is exposed to an external torque that is less than a selected value and the motor is stopped. 9. The method of claim 8, wherein the actuation system includes an internally threaded member, a lead screw matable with the internally threaded member to permit relative rotation between lead screw and the internally threaded member, an wherein an ouput end of the clutch is connected to one of the lead screw and the internally threaded member, the other of the lead screw and the internally threaded member is connected to the extensible member and is slidable relative to the housing, and comprising the step of rotating the output end of the clutch to drive rotation of the one of the lead screw and the internally threaded member which in turn drives sliding movement of the other of the lead screw and the internally threaded member relative to the housing. 10. The method of claim 9, wherein the internally threaded member is slidable within the housing and is connected to the extensible member, the output end of the clutch is connected to the lead screw, and rotation of the output end of the lead screw drives rotation of the lead screw which in turn drives sliding movement of the internally threaded member. 11. The method of claim 8 including the steps of engaging the clutch and driving the motor to move the swing door in response to indication that a user wishes to initiate a powered opening or powered closing of the swing door, and disengaging the clutch in response to an indication that the user wishes to manually move the swing door. 12. The method of claim 8, wherein the actuation system includes a gear train coupled to the motor, and the gear train is not backdrivable. 13. The method of claim 12, wherein the gear train includes a worm coupled between the motor and a worm gear, the worm includes a thread having less than a selected lead angle, and the lead angle is selected to prevent backdriving of the worm. 14. The method of claim 8, wherein the actuation system includes a housing connectable to the other one of the swing door and the vehicle body, wherein the extensible member is extendible and retractable relative to the housing. 15. A method for controlling a swing door actuation system for moving a vehicular swing door relative to a vehicle body, wherein the actuation system includes an extensible member connected to the swing door or the vehicle body, a motor, and a clutch operatively connected to the motor and the extensible member, comprising the steps of: engaging the clutch to operatively connect the motor to the extensible member,disengaging the clutch to operatively disconnect the motor from the extensible member, the clutch has a selected slip torque value that prevents movement of the swing door when the swing door is exposed to an external torque that is less than the selected slip torque value and the motor is stopped;engaging the clutch and drive the motor to move the swing door in response to an indication that a user wishes to initiate a powered opening or powered closing of the swing door;disengaging the clutch in response to the indication that the user wishes to manually move the swing door;sending a signal from an actuated manual movement switch to a control system providing the indication that the user wishes to manually move the swing door, wherein the control system is configured to disengage the clutch in response to receipt of the signal from the actuated manual movement switch;sensing movement of the extensible member at a time when the motor is unpowered and sending a signal from a position sensor to the control system indicating that the user wishes to manually move the swing door in response to movement of the extensible member; andsending a manual movement signal to the control system in response to sensing that the motor is urged at a speed greater than a threshold design speed. 16. A method for controlling a swing door actuation system for moving a vehicular swing door relative to a vehicle body, wherein the actuation system includes an extensible member connected to the swing door or the vehicle body, a motor, and a clutch operatively connected to the motor and the extensible member, comprising the steps of: operatively connecting the clutch and the motor;operatively connecting the clutch and the extensible member;operatively connecting the motor to the extensible member by engaging the clutch;operatively disconnecting the motor from the extensible member by disengaging the clutch;preventing movement of the door using the clutch when the swing door is exposed to an external torque that is less than a selected value and the motor is stopped;driving the motor to move the swing door in response to indication that a user wishes to initiate a powered opening or powered closing of the swing door by engaging the clutch and disengaging the clutch in response to an indication that the user wishes to manually move the swing door; andproviding manual movement signals in response to sensing that the motor is urged at a speed greater than a threshold design speed. 17. The method of claim 16 including sending signals to a control system indicative of whether the user desires to initiate a powered opening or a powered closing of the swing door, wherein the control system is configured to engage the clutch and drive the motor to move the swing door in response to the indication that the user wishes to initiate a powered opening or powered closing of the swing door. 18. The method of claim 17 wherein the signals are sent from a key fob, a dashboard mounted push button control, or manual activation of a door latch opening lever. 19. The method of claim 16 including sending signals from a current sensor to the control system that are indicative of the amount of electrical current drawn by the motor. 20. The method of claim 16 wherein the step of engaging the clutch is conducted without the application of electrical power to the clutch. 21. The method of claim 16 wherein the step of disengaging the clutch includes applying electrical power to the clutch. 22. The method of claim 16 including sending signals from an actuated manual movement switch to a control system indicative of whether the user desires to manually move the swing door, wherein the control system is configured to disengage the clutch in response to the indication that the user wishes to manually move the swing door. 23. The method of claim 22 including actuating a door opening lever to actuate the manual movement switch. 24. A method for controlling a swing door actuation system for moving a vehicular swing door relative to a vehicle body, wherein the actuation system includes an extensible member connected to the swing door or the vehicle body, a motor, a clutch operatively connected to the motor and the extensible member, comprising the steps of: engaging the clutch to couple the motor to the extensible member and move the extensible member in response to an indication that a user wishes to initiate a powered opening or powered closing of the swing door;disengaging the clutch to uncouple the motor from the extensible member in response to an indication that the user wishes to manually move the swing door;sending a signal from an actuated manual movement switch to a control system providing the indication that the user wishes to manually move the swing door, wherein the control system is configured to disengage the clutch in response to receipt of the signal from the actuated manual movement switch;sensing movement of the extensible member at a time when the motor is unpowered and sending a signal from a position sensor to the control system indicating that the user wishes to manually move the swing door in response to movement of the extensible member; andsending a manual movement signal to the control system in response to sensing that the motor is urged at a speed greater than a threshold design speed.