Drive device and control method for drive device

Patent metadata

Field	Value
Publication number	US-2017229984-A1
Application number	US-201715416656-A
Country	US
Kind code	A1
Filing date	Jan 26, 2017
Priority date	Feb 5, 2016
Publication date	Aug 10, 2017
Grant date	—

Abstract

Basic current commands of a d-axis and a q-axis are set based on a torque command of a motor. Subsequently, when the rotation speed of the motor is high, an electric angle compensation amount is set to be larger than that when the rotation speed of the motor is low, and a corrected predicted electric angle is set by adding the electric angle compensation amount to a predicted electric angle predicted from an electric angle based on a rotation position of a rotor of the motor from a rotation position detection sensor. Then, current commands of the d-axis and the q-axis are set by multiplying the basic current commands of the d-axis and the q-axis by a correction coefficient based on the corrected predicted electric angle, and an inverter is controlled using the current commands.

First claim

What is claimed is:

1 . A drive device comprising:
a motor; an inverter configured to drive the motor by switching a plurality of switching elements; and an electronic control unit configured to
i) calculate an electric angle of the motor and a rotation speed of the motor,
ii) set an electric angle compensation amount for compensating for deviation between an actual electric angle of the motor when a control signal is output to the inverter and an actual electric angle of the motor when a torque of the motor changes such that the electric angle compensation amount when the rotation speed of the motor is high is larger than the electric angle compensation amount when the rotation speed of the motor is low,
iii) set an electric angle for compensation using the electric angle of the motor and the electric angle compensation amount,
iv) set corrected torque by correcting required torque required for the motor based on the electric angle for compensation such that a torque ripple of the motor is cancelled, and
v) control the inverter such that the corrected torque is output from the motor.

2 . The drive device according to claim 1 ,
wherein the electronic control unit is configured to
vi) set a basic current command of a d-axis based on the required torque,
vii) set a basic current command of a q-axis based on the required torque,
viii) set a correction coefficient for cancelling the torque ripple based on the required torque and the electric angle for compensation,
ix) set a current command of the d-axis by multiplying the basic current command of the d-axis by the correction coefficient,
x) set a current command of the q-axis by multiplying the basic current command of the q-axis by the correction coefficient, and
xi) control the inverter using the current command of the d-axis and the current command of the q-axis.

3 . The drive device according to claim 2 ,
wherein the electronic control unit is configured to
xii) set a feedback term of the d-axis based on the current command of the d-axis and a current of the d-axis,
xiii) set a feedforward term of the d-axis based on the electric angle for compensation, the required torque, and the rotation speed of the motor,
xiv) set a voltage command of the d-axis using the feedforward term of the d-axis and the feedback term of the d-axis,
xv) set a feedback term of the q-axis based on the current command of the q-axis and a current of the q-axis,
xvi) set a feedforward term of the q-axis based on the electric angle for compensation, the required torque, and the rotation speed of the motor,
xvii) set a voltage command of the q-axis using the feedforward term of the q-axis and the feedback term of the q-axis, and
xviii) control the inverter using the voltage command of the d-axis and the voltage command of the q-axis.

4 . A control method for a drive device, the drive device including
a motor, an inverter configured to drive the motor by switching a plurality of switching elements, and an electronic control unit, the control method comprising
i) calculating, by the electronic control unit, an electric angle of the motor and a rotation speed of the motor,
ii) setting, by the electronic control unit, an electric angle compensation amount for compensating for deviation between an actual electric angle of the motor when a control signal is output to the inverter and an actual electric angle of the motor when a torque of the motor changes such that the electric angle compensation amount when the rotation speed of the motor is high is larger than the electric angle compensation amount when the rotation speed of the motor is low,
iii) setting, by the electronic control unit, an electric angle for compensation using the electric angle of the motor and the electric angle compensation amount,
iv) setting, by the electronic control unit, corrected torque by correcting required torque required for the motor based on the electric angle for compensation such that a torque ripple of the motor is cancelled, and
v) controlling, by the electronic control unit, the inverter such that the corrected torque is output from the motor.

Assignees

• Toyota Motor Co Ltd
• Aisin Aw Co

Inventors

• Sato Ryoji
• Tanaka Shogo
• Shimaji Takuya

Classifications

• H02P6/10 Primary

  Arrangements for controlling torque ripple, e.g. providing reduced torque ripple · CPC title

• B60L15/025

  using field orientation; Vector control; Direct Torque Control [DTC] · CPC title

• H02P21/06

  Rotor flux based control involving the use of rotor position or rotor speed sensors · CPC title

• B60L2240/423

  Torque · CPC title

• H02P6/153 Primary

  wherein the commutation is advanced from position signals phase in function of the speed · CPC title