Electric actuator

An electric actuator to switch a shift position, the electric actuator comprising:

• a motor;
• an output shaft to be driven by the motor;
• a detent plate fixed to the output shaft and including valley portions including a first valley portion corresponding to a parking position provided on one end side in a circumferential direction and a second valley portion corresponding to a non-parking position provided on another end side in the circumferential direction;
• an elastic portion including a contacted portion to be brought into contact with any one of the valley portions by an elastic force generated by rotation of the detent plate;
• a first rotation sensor to detect a first rotation angle that is a rotation angle of the motor;
• a second rotation sensor to detect a second rotation angle that is a rotation angle of the output shaft;
• and
• a controller to control the motor based on detection results of the first rotation angle and the second rotation angle;
• wherein
• when an abnormality occurs in the second rotation sensor, the controller is configured or programmed to execute:
• abutting the contacted portion on a first side wall portion located on one end side in the circumferential direction of the first valley portion in the detent plate by rotating the motor;
• acquiring, as a side wall position angle, the first rotation angle detected by the first rotation sensor when the contacted portion abuts on the first side wall portion;
• a reverse rotation process of reversely rotating the motor to an angle at which the first rotation angle corresponds to a target rotation angle with reference to the side wall position angle;
• and
• a stationary determination process of determining that the contacted portion is stationary at the parking position when the first rotation angle detected by the first rotation sensor continues to fall within a first tolerance having the target rotation angle as a reference value within a first predetermined time.