Electronic control device and operation control method therefor

Patent metadata

Field	Value
Publication number	US-10970147-B2
Application number	US-201616074460-A
Country	US
Kind code	B2
Filing date	May 24, 2016
Priority date	May 24, 2016
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

An abnormality determination means performs detection of abnormality of one of the pairs of detection means at a normal speed, and performs detection of abnormality of the other of the pairs at a speed not higher than the normal speed, and, when a sign of abnormality of the detection means is detected at the normal speed, a CPU performs switching to the other normal pair and continues control, and the abnormality determination means performs detection of abnormality of the other normal pair at the normal speed, and meanwhile, continues to perform detection of abnormality of the abnormal pair at a speed not higher than the normal speed.

First claim

The invention claimed is:

1. An electronic control device comprising:
at least a pair of two detectors including a first detector and a second detector; and
a controller which controls a target by using information about the two detectors and which includes an abnormality determinator to perform determination as to abnormality of each of the two detectors, the controller to continue control with a normal one of the two detectors at a time of an abnormality, wherein
the controller executes control on a first detector,
the abnormality determinator performs, for the execution, detection of abnormality of the first detector at a normal speed and performs detection of abnormality of the second detector at a speed not higher than the normal speed, the abnormality determinator having at least two types of determination states including a sign of abnormality where an abnormality detected for a first time and an abnormality confirmation where after the first time the abnormality continues to be detected at a speed not higher than the normal speed, and,
in a case where the sign of abnormality of the first detector at the normal speed is detected, the controller performs switching to the second detector and continues the control, and
the abnormality determinator performs detection of abnormality of the second detector at the normal speed, and meanwhile, continues to perform detection of abnormality of the first detector at a speed not higher than the normal speed.

2. The electronic control device according to claim 1 , wherein
the abnormality determinator continues detection of abnormality of the first detector at a speed not higher than the normal speed after the controller performs switching to the second detector within a period from the first time at which the sign of abnormality is detected to a time at which it is determined that the abnormality confirmation has occurred, and,
as a result, even if it fails to be determined that the abnormality confirmation has occurred in the first detector, the controller continues the control on the second detector.

3. The electronic control device according to claim 2 , wherein a pair of two output circuits to drive the target are provided,
each of the two detectors is provided for the corresponding output circuit among the two output circuits, and,
when the controller performs switching from one of the two detectors to the other of the two detectors, the controller performs also switching from one of the two output circuits to the other of the two output circuits substantially at the same time.

4. The electronic control device according to claim 2 , wherein the controller controls a motor of an electric power steering device, and
each of the two detectors is a rotation angle sensor to detect a rotation angle of the motor.

5. The electronic control device according to claim 1 , wherein,
once performing switching to the second detector, the controller neither performs switching again within a predetermined time period even if a sign of abnormality of the second detector is detected within the predetermined time period, nor performs switching again within the predetermined time period even if the first detector is determined to be normal.

6. The electronic control device according to claim 5 , wherein a pair of two output circuits to drive the target are provided,
each of the two detectors is provided for the corresponding output circuit among the two output circuits, and,
when the controller performs switching from one of the two detectors to the other of the two detectors, the controller performs also switching from one of the two output circuits to the other of the two output circuits substantially at the same time.

7. The electronic control device according to claim 5 , wherein the controller controls a motor of an electric power steering device, and
each of the two detectors is a rotation angle sensor to detect a rotation angle of the motor.

8. The electronic control device according to claim 1 , wherein
the abnormality determinator continues detection of abnormality of the first detector at a speed not higher than the normal speed after the controller performs switching to the second detector within a period from a time at which a sign of abnormality is detected to a time at which it is determined that an abnormality has occurred, and,
as a result, if it fails to be determined that an abnormality has occurred and if a deviation in output value between the two pairs of detectors is equal to or smaller than a predetermined value, the controller performs switching again and performs the control.

9. The electronic control device according to claim 8 , wherein a pair of two output circuits to drive the target are provided,
each of the two detectors is provided for the corresponding output circuit among the two output circuits, and,
when the controller performs switching from one of the two detectors to the other of the two detectors, the controller performs also switching from one of the two output circuits to the other of the two output circuits substantially at the same time.

10. The electronic control device according to claim 8 , wherein the controller controls a motor of an electric power steering device, and
each of the two detectors is a rotation angle sensor to detect a rotation angle of the motor.

11. The electronic control device according to claim 1 , wherein a pair of two output circuits to drive the target are provided,
each of the two detectors is provided for the corresponding output circuit among the two output circuits, and,
when the controller performs switching from one of the two detectors to the other of the two detectors, the controller performs also switching from one of the two output circuits to the other of the two output circuits substantially at the same time.

12. The electronic control device according to claim 11 , wherein the controller controls a motor of an electric power steering device, and
each of the two detectors is a rotation angle sensor to detect a rotation angle of the motor.

13. The electronic control device according to claim 1 , wherein a pair of two output circuits to drive the target are provided,
each of the two detectors is provided for the corresponding output circuit among the two output circuits, and,
when the controller performs switching from one of the two detectors to the other of the two detectors, the controller performs also switching from one of the two output circuits to the other of the two output circuits substantially at the same time.

14. The electronic control device according to claim 1 , wherein the controller controls a motor of an electric power steering device, and
each of the two detectors is a rotation angle sensor to detect a rotation angle of the motor.

15. The electronic control device according to claim 1 , wherein the controller controls a motor of an electric power steering device, and each of the two detectors is a rotation angle sensor to detect a rotation angle of the motor.

16. An operation control method for an electronic control device including at least a pair of two detectors including a sensor, and a controller which controls a target by using information about the two detectors and which includes an abnormality determinator to perform determination as to abnormality of the two detectors, the controller to continue control with a normal one of the pair at a time of an abnormality,
the abnormality determinator being included in a CPU, the operation control method comprising:
performing abnormality detection on a first detector of a selected on

Assignees

• Mitsubishi Electric Corp

Inventors

• Iwami Eiji
• Yamamoto Munenori

Classifications

• B62D5/046 Primary

  Controlling the motor · CPC title

• H02P25/00

  Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details · CPC title

• H02P25/26

  with arrangements for controlling secondary impedance · CPC title

• H02P6/181

  using different methods depending on the speed · CPC title

• H02P6/00

  Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor (vector control H02P21/00) · CPC title