Control device and control method for vehicular power system
A control device for a vehicular power system including an induction motor includes an electronic control unit configured to detect a locked state of the induction motor, calculate a lock-release slip frequency that causes an electric frequency to be outside a lock range, and control the induction motor so that a slip frequency of the induction motor becomes equal to the lock-release slip frequency when the locked state is detected.
1. A control device for a vehicular power system including an induction motor, the control device comprising:
an electronic control unit configured to:
(a) detect a locked state of the induction motor;
(b) calculate a lock-release slip frequency that causes an electric frequency to be outside a lock range; and
(c) control the induction motor so that a slip frequency of the induction motor becomes equal to the lock-release slip frequency when the locked state is detected.
2. The control device according to claim 1 , wherein the lock-release slip frequency is a slip frequency that makes the electric frequency substantially equal to a boundary value of the lock range.
3. The control device according to claim 1 , wherein the electronic control unit is configured to calculate a torque value corresponding to the lock-release slip frequency, based on a pre-stored relationship between the slip frequency and torque of the induction motor, the electronic control unit being configured to control the induction motor based on the obtained torque value.
4. A control method for vehicle having an electronic control unit and a vehicular power system that includes an induction motor, the method comprising:
(a) detecting, by the electronic control unit, a locked state of the induction motor;
(b) calculating, by the electronic control unit, a lock-release slip frequency that causes an electric frequency to be outside a lock range; and
(c) controlling, by the electronic control unit, the induction motor so that a slip frequency of the induction motor becomes equal to the lock-release slip frequency when the locked state is detected.