Vehicle clutch control method and vehicle clutch control device

A clutch control device for a vehicle having a dog clutch and an engagement sensor that detects an engagement of the dog clutch, the clutch control device comprising:

• a controller configured to:
• determine whether the engagement sensor is normal or has failed;
• when the engagement sensor is determined to be normal, execute the engagement of the dog clutch by
• setting a target value of a magnitude of a differential rotation of the dog clutch to a first prescribed value
• starting the engagement of the dog clutch upon determining that the magnitude of the differential rotation is equal to or smaller than the first prescribed value, and
• determining whether the engagement of the dog clutch is completed by using the engagement sensor;
• and
• when the engagement sensor is determined to have failed, executing the engagement of the dog clutch by
• setting the target value to a second prescribed value that is larger than the first prescribed value,
• starting the engagement of the dog clutch upon determining that the magnitude of the differential rotation is equal to or smaller than the second prescribed value, and
• determining that the engagement of the dog clutch is completed when the magnitude of the differential rotation is equal to or smaller than a third prescribed value, the third prescribed value being a judgement value set in advance for determining whether the engagement of the dog clutch is complete.