MOTOR DRIVE CONTROL DEVICE

摘要

A motor drive control device is capable of reducing gear rattling noise generated in a speed reducer without increasing size of the speed reducer and the number of components. A motor ECU controls a motor to generate a reverse set torque (Tn) when a target torque (T*) is reversed (at a time t1). The motor ECU sequentially calculates a backlash (B) in a counter gear mechanism, and sets a time period (D1) in which the reverse set torque (Tn) is generated by the motor and a time period (D2) in which a return set torque (Tp) is generated by the motor so that the backlash (B) at a current time becomes equal to a time integrated value (corresponding to an area A) of an estimated relative velocity (V2−V1) until a time of reabutment.

主权项

1. A motor drive control device to be mounted in an in-wheel motor driven automobile comprising a motor and a speed reducer installed inside a wheel, the in-wheel motor driven automobile being configured to transmit a torque of the motor to the wheel through an intermediation of the speed reducer, the motor drive control device being configured to control driving of the motor in accordance with a target torque,
the motor drive control device comprising: relative-position detection means for detecting a relative position between a tooth of an input-side gear and a tooth of an output-side gear included in the speed reducer; and motor-speed control means for reducing a rotation speed of the motor when a direction of the target torque is reversed from a first direction to a second direction and for increasing the rotation speed of the motor at timing determined based on the relative position in a middle of an idling time period in which the input-side gear rotates in the second direction relative to the output-side gear due to a backlash present between the input-side gear and the output-side gear, to thereby lower an approach velocity at which the tooth of the input-side gear approaches the tooth of the output-side gear.