Torque distribution apparatus, torque distribution method, torque distribution value generation method, and program

摘要

A torque distribution apparatus acquires an instructed torque input and a motor efficiency map for motors; detects vehicular speed and drive wheel rotational speed; calculates based on the detected speeds, a relational expression of drive wheel slip rate and a friction coefficient; creates based on the relational expression, a performance curve expression indicating relations between torque and the drive wheel rotational speed, superimposes the performance curve expression on the motor efficiency map, creates an efficiency variation expression indicating for each vehicular speed, the torque and efficiency values of the motor efficiency map, and calculates a torque that optimizes efficiency from the efficiency variation expression; calculates based on the instructed torque and the torque optimizing efficiency, a torque distribution value for each motor; and controls torque distribution to each motor, within a range of the slip rate being 0 to 0.2 and based on the torque distribution values.

主权项

1. A torque distribution apparatus distributes an input instructed torque to motors connected to drive wheels, the torque distribution apparatus comprising:
an instructed torque acquiring unit that acquires the instructed torque input; an efficiency map acquiring unit that acquires a motor efficiency map that corresponds to the motors; a vehicular speed detecting unit that detects vehicular speed of a vehicle equipped with the motors; a drive wheel rotational speed detecting unit that detects drive wheel rotational speed of the drive wheels; a slip rate calculating unit that based on the vehicular speed and the drive wheel rotational speed, calculates a relational expression of a slip rate at the drive wheels and a friction coefficient; a calculating unit that based on the relational expression of the slip rate and the friction coefficient, creates a performance curve expression that indicates relations between torque and the drive wheel rotational speed that includes the slip rate, superimposes the performance curve expression on the motor efficiency map, creates an efficiency variation expression that indicates for each vehicular speed, the torque and efficiency values of the motor efficiency map, and calculates a torque that optimizes efficiency, from the efficiency variation expression on the performance curve; a distributing unit that based on the instructed torque and the torque optimizing efficiency, calculates a torque distribution value for each of the motors; and a control unit that within a range of the slip rate being 0 to 0.2 and based on the calculated torque distribution values, controls torque distribution to each of the motors.