Vehicle drive device
AssigneeAisin Corporation
InventorsRyosuke Nagaya, Tadaaki Watanabe
Life of this patent
Estimating the term…
Abstract
When there is backlash in a rotation direction between a lock member at a lock position and a first rotary member, a rotational position of a target rotary member, the rotational position being detected in a locked state of a parking lock mechanism by a rotational position sensor, is defined as a detected rotational position, and a rotational position of the target rotary member in a case where it is assumed that there is not the backlash in the locked state of the parking lock mechanism is defined as a theoretical lock position, a control device executes torque direction determination processing that determines a wheel torque direction, on the basis of a direction of deviation of the detected rotational position from the theoretical lock position due to the backlash.
Claims9
A vehicle drive device comprising:
- a rotating electrical machine that functions as a driving force source for wheels;
- a parking lock mechanism that selectively restricts rotation of a first rotary member that rotates in conjunction with the wheels;
- a rotational position sensor that detects a rotational position of a target rotary member that is either a second rotary member that rotates in conjunction with the wheels and is disposed on the wheels side with respect to the first rotary member on a power transmission path connecting the rotating electrical machine and the wheels, or the first rotary member;
- and
- a control device that acquires a detected value from the rotational position sensor and controls the rotating electrical machine and the parking lock mechanism, wherein
- the parking lock mechanism includes a lock member that is movable to a lock position at which the lock member is engaged with the first rotary member to restrict rotation of the first rotary member, and to an unlock position at which the lock member is separated from the first rotary member to allow rotation of the first rotary member, and a drive device that drives the lock member,
- there is backlash in a rotation direction between the lock member at the lock position and the first rotary member,
- a state of the parking lock mechanism when the lock member is at the lock position is defined as a locked state, a rotational position of the target rotary member, the rotational position being detected in the locked state by the rotational position sensor, is defined as a detected rotational position, and a rotational position of the target rotary member in a case where it is assumed that there is not the backlash in the locked state is defined as a theoretical lock position, and
- the control device executes torque direction determination processing that determines a wheel torque direction that is a direction of torque transmitted from the wheels to the first rotary member, on the basis of a direction of deviation of the detected rotational position from the theoretical lock position due to the backlash.
Dependencies are inferred from the claim text.