A control circuit switches over a shift range by controlling driving of a motor to rotationally drive a detent plate. A current detection circuit detects a current value corresponding to a driving current supplied to drive the motor. A current increase check part performs check processing to check whether the current value detected by the current detection circuit has increased. A motor rotation stop part stops rotation of the motor when the current increase check part determines that the current has increased. A reverse driving part reverses the rotation direction of the motor and rotationally drives the motor after stopping of the motor by the motor rotation stop part.

There is obtained an automatic transmission control apparatus that makes it possible that even when an abnormality occurs in a sensor for detecting a motor rotation angle or the like, control of an automatic transmission is appropriately performed. Inputted first, second, and third detection signals are compared with one another; it is determined that at least two detection signals, out of these detection signals, that coincide with each other are normal and another detection signal is abnormal; then, based on the result of the determination, switching of the ranges of the automatic transmission is controlled.

There is obtained an automatic transmission control apparatus that makes it possible that even when an abnormality occurs in a sensor for detecting a motor rotation angle or the like, control of an automatic transmission is appropriately performed. Inputted first, second, and third detection signals are compared with one another; it is determined that at least two detection signals, out of these detection signals, that coincide with each other are normal and another detection signal is abnormal; then, based on the result of the determination, switching of the ranges of the automatic transmission is controlled.

The present disclosure relates to a vehicle transmission system that includes a transmission component and an electro-mechanical actuator coupled to the transmission component. The electro-mechanical actuator includes an electric motor and a solenoid that are configured to maintain the transmission component in one of a park position and a non-park position upon receipt of a command. The electric motor and the solenoid are also configured to prevent the transmission component from returning to the park position upon receipt of the command. Further, the electric motor and solenoid are configured to receive the command from a vehicle control system.

The present disclosure relates to a vehicle transmission system that includes a transmission component and an electro-mechanical actuator coupled to the transmission component. The electro-mechanical actuator includes an electric motor and a solenoid that are configured to maintain the transmission component in one of a park position and a non-park position upon receipt of a command. The electric motor and the solenoid are also configured to prevent the transmission component from returning to the park position upon receipt of the command. Further, the electric motor and solenoid are configured to receive the command from a vehicle control system.

A power transfer unit includes an input shaft extending along an input axis and an intermediate drive shaft extending at least partially through the input shaft along the input axis. The power transfer unit further includes a ring gear assembly having a ring gear and a ring gear shaft coupled to the ring gear. The ring gear shaft at least partially surrounds the input shaft and extends along the input axis. The power transfer unit also includes a collar coupled to the input shaft. The collar surrounds the input shaft and is movable relative to the ring gear shaft along the input axis between an engaged position and a disengaged position. When the collar is in the engaged position, the input shaft is coupled to the ring gear shaft. When the collar is in the disengaged position, the input shaft is decoupled from the ring gear shaft.

A motor controller includes a first forward driver rotating a motor in a forward rotation direction, a torque short determiner determining short of a switch torque, a backward driver driving the motor up to an extreme position in the backward rotation direction in a switch torque short case, and a second forward driver rotating the motor from the extreme position to a target position. When the second forward driver drives the motor, a drive objet is rotated not only by a motor torque but also by a twist backlash torque from a rotation transmission part. Further, after a rotation of the motor in the forward rotation direction, the backward rotation operation of the motor is performed only in the switch torque short case, thereby reducing a shift position switch time in a switch torque sufficient case.

A motor controller includes a first forward driver rotating a motor in a forward rotation direction, a torque short determiner determining short of a switch torque, a backward driver driving the motor up to an extreme position in the backward rotation direction in a switch torque short case, and a second forward driver rotating the motor from the extreme position to a target position. When the second forward driver drives the motor, a drive objet is rotated not only by a motor torque but also by a twist backlash torque from a rotation transmission part. Further, after a rotation of the motor in the forward rotation direction, the backward rotation operation of the motor is performed only in the switch torque short case, thereby reducing a shift position switch time in a switch torque sufficient case.

A shift-by-wire control device includes a first detector, a second detector, an auto parking control unit, and a malfunction determining unit. The first and second detectors respectively detect first and second vehicle states attributed to behaviors of a driver. The auto parking control unit executes an auto parking control irrespective of a state of the shift range selected by the shift lever, on conditions that detection results derived from the first and second detectors satisfy respective predetermined conditions. The malfunction determining unit determines that the first detector is malfunctioning, on a condition that the first detector fails to detect a change in the first vehicle state. The auto parking control unit refrains from executing the auto parking control, on a condition that the first detector is determined by the malfunction determining unit as malfunctioning.

A shift-by-wire control device includes a first detector, a second detector, an auto parking control unit, and a malfunction determining unit. The first and second detectors respectively detect first and second vehicle states attributed to behaviors of a driver. The auto parking control unit executes an auto parking control irrespective of a state of the shift range selected by the shift lever, on conditions that detection results derived from the first and second detectors satisfy respective predetermined conditions. The malfunction determining unit determines that the first detector is malfunctioning, on a condition that the first detector fails to detect a change in the first vehicle state. The auto parking control unit refrains from executing the auto parking control, on a condition that the first detector is determined by the malfunction determining unit as malfunctioning.