Electronic control device and operation control method therefor

An electronic control device comprising:

• at least two pairs of detectors;
• and
• a controller which controls a target by using information about these detectors and which includes an abnormality determinator to perform determination as to abnormality of the detector, the controller to continue control with a normal one of the pairs at a time of an abnormality, wherein
• the controller executes control on one of the pairs of detectors,
• the abnormality determinator performs, for the execution, detection of abnormality 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,
• in a case where a sign of abnormality of the detector at the normal speed is detected, the controller performs switching to the other normal pair and continues the control, and
• the abnormality determinator 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.

An operation control method for an electronic control device including at least two pairs of detector including a sensor, and a controller which controls a target by using information about these detectors and which includes an abnormality determinator to perform determination as to abnormality of the detector, the controller to continue control with a normal one of the pairs at a time of an abnormality,

• the abnormality determinator being included in a CPU, the operation control method comprising:
• performing abnormality detection on detector A of a selected one of the two pairs of detectors at a normal speed corresponding to a control amount computation cycle of the controller;
• confirming that the detector A is abnormal, if an abnormality count of the detector A is equal to or more than a predetermined count;
• performing abnormality detection on detector B of the other of the pairs at a speed not higher than the normal speed;
• confirming that the detector B is abnormal, if an abnormality count of the detector B is equal to or more than the predetermined count;
• and
• switching the detector to be used for the control from the detector A to the detector B if abnormality of the detector A being used for the control is detected or confirmed and if abnormality of the detector B of the other pair is neither detected nor confirmed, on the basis of determination results of the abnormality detection and the abnormality confirmation.