Patent ID: 6997289

Claim:
An electrically-operated parking brake device adapted to actuate wheel brakes by an electrically driving mechanism, wherein when one of a forward traveling range and a backward traveling range is selected and the wheel brakes are in operation, if the one traveling range is shifted to the other traveling range, the wheel brakes are released in response to said shifting; the electrically driving mechanism comprising a brake actuator; a sensor input which receives information from vehicle sensors; and a controller which controls the brake actuator based on information received from the vehicle sensors; the controller calculates a targeted brake force based on information received from the sensor input and controls the brake actuator in a manner consistent with the calculated targeted brake force; the vehicle sensors include an inclination sensor which detects the inclination of the road surface; and wherein the calculated targeted brake force comprises a first target force that is used when the electrically operated parking brake device is functioning normally and is determined by the amount of inclination of the road surface as sensed by the inclination sensor; a second target force that is used when a service brake is in a defective state; and a third target force that is used when the inclination sensor has failed.