車両のモータ制御システムおよびモータ制御方法

Abstract

To provide a motor control system that efficiently controls motor torque in a vehicle having a plurality of motors as driving sources.SOLUTION: A motor control system according to the present invention is a motor control system of a vehicle having a plurality of motors as driving sources. The motor control system includes: a required torque determination part that determines required torque amounts required by the plurality of motors correspondingly to a torque amount required by a driver; an optimal operation point torque determination part that determines optimal operation point torque amounts respectively for the plurality of motors; and a motor torque determination part that distributes the required torque amounts respectively to the plurality of motors on the basis of the optimal operation point torque amounts to determine target torque amounts respectively for the plurality of motors.SELECTED DRAWING: Figure 2

Claims

1. A motor control system for a vehicle that includes multiple motors as drive sources, A required torque determination unit that determines the required torque for the multiple motors in response to the driver's requested torque, An optimal operating point torque determination unit that determines the optimal operating point torque for each of the plurality of motors according to the current rotational speed of each of the plurality of motors, A motor torque determination unit determines the target torque for each of the multiple motors by distributing the required torque to each of the multiple motors based on the optimal operating point torque, This includes an optimal operating line torque map that defines the optimal operating point torque corresponding to the optimal operating line for each of the plurality of motors for each rotational speed, The aforementioned optimal operating point torque determination unit is: Using the aforementioned optimal operating line torque map, the optimal operating point torque for each of the multiple motors is determined. The motor torque determination unit is The difference between the sum of the optimal operating point torques of the multiple motors and the required torque is obtained. If the difference is greater than 0, a torque distribution ratio is determined to distribute the torque corresponding to the difference to each of the multiple motors according to the maximum limiting torque of each of the multiple motors, and the torque corresponding to the difference is distributed to each of the multiple motors according to the determined torque distribution ratio. The torque distributed to each of the plurality of motors is used as a torque correction value for each of the plurality of motors, and the target torque is determined by adding or subtracting the torque correction value to the optimal operating point torque of each of the plurality of motors. The motor torque determination unit is A motor control system characterized in that, if the sum of the optimal operating point torques of the plurality of motors is smaller than the required torque, the torque distribution ratio is determined to be even higher for motors with higher maximum limiting torques.

2. The motor torque determination unit is The motor control system according to claim 1, characterized in that the maximum limiting torque is determined according to the current rotational speed of each of the plurality of motors.

3. The motor torque determination unit is The motor control system according to claim 1, characterized in that, if the sum of the optimal operating point torques of the plurality of motors as a whole is the same as the required torque, the optimal operating point torque of each of the plurality of motors is determined as the target torque.

4. The motor control system according to claim 1, further comprising a motor control unit that controls the driving of the plurality of motors based on the target torque.

5. A motor control method for a vehicle that includes multiple motors as drive sources, A step of determining the required torque for the multiple motors in response to the driver's requested torque, The steps include: determining the optimal operating point torque for each of the multiple motors according to the current rotational speed of each of the multiple motors, using an optimal operating line torque map that defines the optimal operating point torque corresponding to the optimal operating line for each of the multiple motors for each rotational speed; The steps include determining the target torque for each of the multiple motors by distributing the required torque to each of the multiple motors based on the optimal operating point torque, The step includes controlling the drive of the plurality of motors based on the target torque, The step of determining the target torque is: A step of obtaining the difference between the sum of the optimal operating point torques of the multiple motors and the required torque, If the difference is greater than 0, the step is to determine a torque distribution ratio for distributing the torque corresponding to the difference to each of the multiple motors according to the maximum limiting torque of each of the multiple motors, The step includes distributing the torque corresponding to the difference value to each of the multiple motors in accordance with the torque distribution ratio determined above, The step of determining the target torque is: The steps include: obtaining the torque distributed to each of the plurality of motors as a torque correction value for each of the plurality of motors; The step includes obtaining the target torque by adding or subtracting the torque correction value to the optimal operating point torque of each of the plurality of motors, The step of determining the torque distribution ratio is: A motor control method characterized in that, if the sum of the optimal operating point torques of the plurality of motors is smaller than the required torque, the torque distribution ratio is determined to be even higher for motors with higher maximum limiting torques.

6. The step of determining the target torque is: The motor control method according to claim 5, further comprising the step of determining the maximum limiting torque according to the current rotational speed of each of the plurality of motors.

7. The step of determining the target torque is: The motor control method according to claim 5, characterized in that, if the sum of the optimal operating point torques of the plurality of motors is the same as the required torque, the method includes the step of determining the optimal operating point torque of each of the plurality of motors as the target torque.

8. The motor control method according to claim 5, characterized in that the optimal operating point torque is a torque value corresponding to the current rotational speed in the optimal operating line of each of the plurality of motors.

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