Motor control apparatus and method of motor driven power steering system

Patent metadata

Field	Value
Publication number	US-2018312196-A1
Application number	US-201815963539-A
Country	US
Kind code	A1
Filing date	Apr 26, 2018
Priority date	Apr 27, 2017
Publication date	Nov 1, 2018
Grant date	—

Abstract

A motor control apparatus of a motor driven power steering (MDPS) system may include: a steering logic controller configured to calculate a current command value for motor control, and transmit the current command value; a current measurement sensor configured to measure a current applied to the motor; and a controller configured to calculate a motor position increment based on the current command value received from the steering logic controller, the measured current value received from the current measurement sensor, and previously stored motor parameters, estimate a current motor position by integrating the calculated motor position increments, and control the motor using the estimated current motor position.

First claim

What is claimed is:

1 . A motor control apparatus of a motor driven power steering (MDPS) system, comprising:
a steering logic controller configured to calculate a current command value for motor control, and transmit the current command value; a current measurement sensor configured to measure a current applied to the motor; and a controller configured to calculate a motor position increment based on the current command value received from the steering logic controller, the measured current value received from the current measurement sensor, and previously stored motor parameters, estimate a current motor position by integrating the calculated motor position increments, and control the motor using the estimated current motor position.

2 . The motor control apparatus of claim 1 , wherein the controller comprises a current controller configured to generate a voltage command value for compensating for an error between the current command value received from the steering logic controller and the measured current value received from the current measurement sensor.

3 . The motor control apparatus of claim 2 , further comprising a storage configured to store the motor parameters including motor resistance and motor inductance, and store the current voltage command value generated through the current controller such that the controller calculates a motor position increment at the next calculation period.

4 . The motor control apparatus of claim 3 , wherein the controller comprises a motor velocity calculator configured to calculate a motor velocity using the current voltage command value generated through the current controller, the measured current value inputted from the current measurement sensor, and the motor resistance and motor inductance stored in the storage.

5 . The motor control apparatus of claim 4 , wherein the controller comprises a motor position increment calculator configured to calculate the motor position increment using the motor velocity calculated through the motor velocity calculator, the measured current value inputted from the current measurement sensor, and the previous voltage command value which is previously generated by the current controller and stored in the storage.

6 . A motor control method of an MDPS system, comprising:
receiving, by a controller, a current command value for motor control from a steering logic controller; receiving, by the controller, a measured current value from a current measurement sensor; calculating, by the controller, a motor position increment based on the current command value received from the steering logic controller, the measured current value received from the current measurement sensor, and previously stored motor parameters; and controlling, by controller, the motor using a current motor position estimated by integrating the calculated motor position increments.

7 . The motor control method of claim 6 , wherein the calculating of the motor position increment comprises generating, by the controller, a voltage command value for compensating for an error between the current command value received from the steering logic controller and the measured current value received from the current measurement sensor.

8 . The motor control method of claim 7 , wherein the calculating of the motor position increment comprises storing the current voltage command in a storage such that the controller calculates a motor position increment at the next calculation period.

9 . The motor control method of claim 8 , wherein the calculating of the motor position increment comprises calculating, by the controller, a motor velocity using the generated current voltage command value, the measured current value inputted from the current measurement sensor, and the motor resistance and motor inductance stored in the storage.

10 . The motor control method of claim 9 , wherein the calculating of the motor position increment comprises calculating, by the controller, the motor position increment using the calculated motor velocity, the measured current value inputted from the current measurement sensor, and the previous voltage command value stored in the storage.

Assignees

• Hyundai Mobis Co Ltd

Inventors

• Kim Cheon Kyu
• Yoo Ji Hoon

Classifications

• B62D6/001

  the torque NOT being among the input parameters · CPC title

• B62D5/0463 Primary

  calculating assisting torque from the motor based on driver input · CPC title

• H02P21/18

  Estimation of position or speed · CPC title

• B62D15/0235 Primary

  by measuring or deriving directly at the electric power steering motor · CPC title

• H02P21/22

  Current control, e.g. using a current control loop · CPC title