Rotary electric machine control device and electric power steering device using same

Patent metadata

Field	Value
Publication number	US-2019359253-A1
Application number	US-201916534101-A
Country	US
Kind code	A1
Filing date	Aug 7, 2019
Priority date	Feb 10, 2017
Publication date	Nov 28, 2019
Grant date	—

Abstract

A rotary electric machine control device includes multiple drive circuits provided for respective winding sets in a rotary electric machine, and multiple control units. When combinations of the winding sets and configurations provided correspondingly to the respective winding sets are defined as systems, the control units are provided for the respective systems. Each of the control units controls energization of the winding set provided correspondingly, and monitors an abnormality of a monitoring target. Each of the control units performs an abnormality detection time backup control during a period from detection of the abnormality of the monitoring target to confirmation of the abnormality, and performs an abnormality confirmation time backup control when the abnormality is confirmed.

First claim

What is claimed is:

1 . A rotary electric machine control device for controlling driving of a rotary electric machine including a plurality of winding sets, comprising:
a plurality of drive circuits provided for the respective winding sets; and a plurality of control units provided correspondingly to respective systems when combinations of the winding sets and configurations provided correspondingly to the respective winding sets are defined as the systems, each of the control units including a drive control unit configured to control energization of the winding set provided correspondingly and an abnormality monitoring unit configured to monitor an abnormality of a monitoring target, wherein each of the control units includes a CPU, the drive control unit is configured to perform an abnormality detection time backup control during a period from detection of the abnormality of the monitoring target to confirmation of the abnormality, and the drive control unit is configured to perform an abnormality confirmation time backup control when the abnormality is confirmed.

2 . The rotary electric machine control device according to claim 1 , wherein
the abnormality detection time backup control is a normal system driving control for controlling driving of the rotary electric machine using a normal system which is the system in which the abnormality is not detected, without using an abnormal system which is the system in which the abnormality is detected.

3 . The rotary electric machine control device according to claim 1 , wherein
the control units are capable of transmitting and receiving information to and from each other through communication, the system for which each of the control units is provided is defined as a subject system, and the abnormality detection time backup control is a signal substitute control for controlling the energization of the winding set using the information acquired through communication from the control unit of the system in which the abnormality is not detected in place of information of the subject system in which the abnormality is detected.

4 . The rotary electric machine control device according to claim 1 , wherein
each of the control unit is capable of acquiring the information used for driving control of the rotary electric machine from another system using a wiring, the system for which each of the control units is provided is defined as a subject system, the abnormality detection time backup control is a signal substitute control for controlling the energization of the winding set using the information acquired from the system in which the abnormality is not detected through the wiring in place of information of the subject system in which the abnormality is detected.

5 . The rotary electric machine control device according to claim 1 , wherein
the abnormality detection time backup control is a current limiting control for limiting a current supplied to the winding set.

6 . The rotary electric machine control device according to claim 1 , wherein
the abnormality confirmation time backup control is a normal system driving control for controlling driving of the rotary electric machine using a normal system which is the system in which the abnormality is not detected without using an abnormal system which is the system in which the abnormality is detected.

7 . The rotary electric machine control device according to claim 1 , wherein
the control units are capable of transmitting and receiving information to and from each other through communication, the system for which each of the control units is provided is defined as a subject system, and the abnormality confirmation time backup control is a signal substitute control for controlling the energization of the winding set using the information acquired through communication from the control unit of the system in which the abnormality is not detected in place of information of the subject system in which the abnormality is detected.

8 . The rotary electric machine control device according to claim 1 , wherein
each of the control unit is capable of acquiring the information used for driving control of the rotary electric machine from another system using a wiring, the system for which each of the control units is provided is defined as a subject system, and the abnormality confirmation time backup control is a signal substitute control for controlling the energization of the winding set using the information acquired from the system in which the abnormality is not detected through the wiring in place of information of the subject system in which the abnormality is detected.

9 . The rotary electric machine control device according to claim 1 , wherein
the abnormality confirmation time backup control is a current limiting control for limiting a current supplied to the winding set.

10 . The rotary electric machine control device according to claim 1 , wherein
when the abnormality detection time backup control is a normal system driving control for controlling driving of the rotary electric machine using a normal system which is the system in which the abnormality is not detected without using an abnormal system which is the system in which the abnormality is detected, the drive control unit is configured to continue the normal system driving control as the abnormality confirmation time backup control, and when the abnormality detection backup control is other than the normal system driving control, the drive control unit is configured to shift to the normal system driving control as the abnormality confirmation time backup control.

11 . The rotary electric machine control device according to claim 1 , wherein
the abnormality monitoring unit confirms the abnormality when a predetermined abnormality continuation condition is satisfied.

12 . The rotary electric machine control device according to claim 1 , wherein
the drive control unit is configured to return from the abnormality detection time backup control to a normal control when the abnormality is not confirmed within a predetermined period after the abnormality detection.

13 . The rotary electric machine control device according to claim 1 , wherein
the monitoring target includes a torque sensor.

14 . The rotary electric machine control device according to claim 1 , wherein
the monitoring target includes a rotation angle sensor.

15 . An electric power steering device comprising:
a rotary electric machine including a plurality of winding sets and configured to output an assist torque for assisting a driver to steer a steering member; a power transmission portion configured to transmit a driving force of the rotary electric machine to a drive target; and a rotary electric machine control device configured to control driving of the rotary electric machine and including a plurality of driving circuits and a plurality of winding sets, the drive circuits provided for the respective winding sets, the control units provided correspondingly to respective systems when combinations of the winding sets and configurations provided correspondingly to the respective winding sets are defined as the systems, each of the control units including a drive control unit that controls energization of the winding set provided correspondingly and an abnormality monitoring unit that monitors an abnormality of a monitoring target, wherein each of the control units includes a CPU, the drive control unit performs an abnormality detection time backup control during a period from detection of the abnormality of the monitoring target to confirma

Assignees

• Denso Corp

Inventors

• Kuramitsu Shuji
• Kabune Hideki
• Nakamura Koichi
• Oka Atsuko
• Taki Masaya

Classifications

• H02M7/48

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title

• B62D5/0481 Primary

  monitoring the steering system, e.g. failures · CPC title

• H02P29/028

  the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault · CPC title

• H02P29/032 Primary

  Preventing damage to the motor, e.g. setting individual current limits for different drive conditions · CPC title

• B62D5/046

  Controlling the motor · CPC title