SHIFT RANGE SWITCHING APPARATUS

摘要

There is provided a shift range switching apparatus that can perform appropriate fail-safe control when a power source supplied to an electronically controlled shift range switching apparatus is instantaneously interrupted. When due to instantaneous interruption of a power source supplied to the shift range switching apparatus, the shift range switching apparatus is reactivated, a target shift range is determined based on a rotation position of a detent plate detected by a detent position sensor immediately after the reactivation, and the rotation position of the detent plate is controlled.

主权项

1. A shift range switching apparatus comprising:
an actuator that outputs rotation of an electric motor; a detent plate that is pivoted by rotation output of the actuator; a detent spring that engages with any one of two or more recesses provided in the detent plate so as to fix a rotation position of the detent plate; a shift range switching mechanism that switches real shift ranges of an automatic transmission in accordance with a rotation position of the detent plate fixed by engagement between any one of the recesses provided in the detent plate and the detent spring; a detent position sensor that detects positional information corresponding to a rotation position of the detent plate; a real shift range determination means that determines a real shift range of the automatic transmission, based on positional information corresponding to a rotation position of the detent plate detected by the detent position sensor; a shift range setting means that outputs a demanded shift range corresponding to operation of a driver; a target shift range determination means that determines the target shift range to be a demanded shift range outputted from the shift range setting means; and an actuator control means that controls a rotation position of the detent plate by driving the actuator in such a way that a real shift range determined by the real shift range determination means coincides with a target shift range determined by the target shift range determination means, based on the positional information corresponding to the rotation position of the detent plate detected by the detent position sensor, the real shift range determined by the real shift range determination means, and the target shift range determined by the target shift range determination means, wherein when due to instantaneous interruption of a power source supplied to the shift range switching apparatus, the shift range switching apparatus is reactivated, the target shift range determination means determines a target shift range in accordance with a rotation position of the detent plate detected by the detent position sensor immediately after the reactivation.