Patent Number: 7,132,806

Title: Motor control apparatus and motor control method

Abstract: An increase in angular acceleration .alpha. of a rotating shaft of a motor, which outputs a torque to a drive shaft linked to drive wheels, may cause a skid on the drive wheels. In response to detection of a skid, the control procedure of the invention sets a maximum torque Tmax according to a preset map representing a relation between the angular acceleration .alpha. and the maximum torque Tmax, and restricts an output torque level to the drive shaft. The map is set to decrease the maximum torque Tmax with an in crease in angular acceleration .alpha.. The restricted output torque level is restored at a zero cross timing of the angular acceleration .alpha. after a negative peak in the course of convergence of the skid. This arrangement makes the direction of the torque restored from the torque restriction identical with the direction of the angular acceleration, thus effectively reducing torsions of the drive shaft and thereby preventing potential torsional vibrations of the drive shaft.

Inventors: Hommi; Akira (Aichi-ken, JP), Hamajima; Kiyotaka (Okazaki, JP), Nada; Mitsuhiro (Toyota, JP)

Assignee: Toyota Jidosha Kabushiki Kaisha

International Classification: B61C 15/08 (20060101); B61C 15/12 (20060101)

Expiration Date: 2019-11-07 0:00:00