Embodiments of a system for controlling a vehicle power tailgate are described. The system includes a motor operably connectible to a tailgate and configured to open the tailgate at any of at least a first opening speed and a second opening speed lower than the first opening speed. The system is operable to, responsive to a determination that an external load is being applied to the tailgate when the tailgate is in a closed condition, control operation of the motor to open the tailgate at the second predetermined tailgate opening speed if an estimated magnitude of the load is below a predetermined threshold load.

A power closure actuator for powering a movable closure includes a shaft situated between an electric motor and an output member. A brake device along the shaft is actuable via an electric brake actuator to apply braking. An active brake clamp is movable by the electric brake actuator. An axially floating rotor is rotatable with the shaft and has a first axial side facing the active brake clamp a second axial side providing a second braking surface. A passive backing brake clamp is positioned adjacent the second braking surface. The axially floating rotor is biased away from the passive backing brake clamp by a first biasing member. Deflection of the first biasing member coupled with axial movement of the active brake clamp and the axially floating rotor enables braking by pinching action of the axially floating rotor between the active brake clamp and the passive backing brake clamp.

A reverse rotation prevention mechanism is provided on a torque transmission path between an output shaft and a driving shaft of a motor. The reverse rotation prevention mechanism includes: a first frictional force generation unit configured to inhibit a lock plate provided on the torque transmission path from rotating relative to another member when an external force is exerted on the output shaft; and a second frictional force generation unit configured to generate a braking force that prevents reverse rotation when an external force is exerted on the output shaft by causing a portion of the lock plate to be pressed. The first frictional force generation unit is provided in an area different from the second frictional force generation unit.

A motor drive system configured to detect and prevent undesired movement of an item that is configured to be driven by the motor drive system. The motor drive system having: an electronic control unit operatively coupled to a rotor of the motor drive system, the electronic control unit being configured to detect undesired rotation of a shaft of the rotor, wherein the undesired rotation of the shaft is not caused by a force applied by the rotor; and wherein the electronic control unit of the motor drive system is configured to short windings of the motor drive system after a predetermined amount of undesired rotation of the shaft is detected by the electronic control unit such that further rotation of the rotor is prevented.

A drive arrangement for a door device which includes a door member. The drive arrangement includes a door shaft, a driven shaft which is operatively connected to the door shaft, a transmission arrangement which drives the door shaft, and at least one electric motor which is coupled to the transmission arrangement to move the door member of the door device from a closed state to an open state and vice versa. The at least one electric motor has at least one eccentric drive shaft. The transmission arrangement includes an eccentric gear transmission which has at least two orbiting toothed disks, each of which have an internal toothing. The at least two orbiting toothed disks are driven by the at least one eccentric drive shaft of the at least one electric motor, and, via the internal toothing, engage with the driven shaft.

A method for controlling a power tailgate in a vehicle power tailgate system includes steps of controlling operation of a motor to attempt to lower or raise a tailgate operably connected to the motor, determining that a clutch interposed between the motor and the tailgate (and operably connected to the motor and the tailgate) slipped by at least a predetermined slip amount during operation of the motor to attempt to lower or raise the tailgate and, responsive to the determination that the clutch slipped by at least the predetermined slip amount, generating an alert indicating a need for manual reset of the tailgate.

Embodiments of a system for controlling a vehicle power tailgate are described. The system includes a motor operably connectible to a tailgate to open and close the tailgate, a processor, and a memory communicably coupled to the processor. The memory stores a tailgate control module including instructions that when executed by the processor cause the processor to, responsive to a value of a motor speed parameter being above a predetermined motor speed threshold and a value of a motor acceleration parameter being above a predetermined motor acceleration threshold during opening of a tailgate, control operation of the motor to apply a braking force to the tailgate.

Embodiments of a system for controlling a vehicle power tailgate are described. The system includes a motor operably connectible to a tailgate to open and close the tailgate, a processor, and a memory communicably coupled to the processor. The memory stores a tailgate control module including instructions that when executed by the processor cause the processor to, responsive to a value of a motor speed parameter being above a predetermined motor speed threshold and a value of a motor acceleration parameter being above a predetermined motor acceleration threshold during opening of a tailgate, control operation of the motor to apply a braking force to the tailgate.

A reverse rotation prevention mechanism is provided on a torque transmission path between an output shaft and a driving shaft of a motor. The reverse rotation prevention mechanism includes: a first frictional force generation unit configured to inhibit a lock plate provided on the torque transmission path from rotating relative to another member when an external force is exerted on the output shaft; and a second frictional force generation unit configured to generate a braking force that prevents reverse rotation when an external force is exerted on the output shaft by causing a portion of the lock plate to be pressed. The first frictional force generation unit is provided in an area different from the second frictional force generation unit.

Embodiments of a system for controlling a vehicle power tailgate are described. The system includes a motor operably connectible to a tailgate and configured to open the tailgate at any of at least a first opening speed and a second opening speed lower than the first opening speed. The system is operable to, responsive to a determination that an external load is being applied to the tailgate when the tailgate is in a closed condition, control operation of the motor to open the tailgate at the second predetermined tailgate opening speed if an estimated magnitude of the load is below a predetermined threshold load.