Patent ID: 8532902

Claim:
A method for controlling a electromechanical parking brake unit of a parking brake system provided in a vehicle, comprising: detecting a current vehicle speed by means of a speed sensor of a speed sensor system in the form of a speed measuring signal, a control device of the speed sensor system checking whether the speed measuring signal is defective or not received from the speed sensor, the control device detecting a deceleration measuring signal indicating a current vehicle deceleration by means of at least one acceleration sensor system, and, in the event of a detected defective speed measuring signal or the speed measuring signal not received from the speed sensor, operating the parking brake system in an emergency operation mode, in which, at the beginning of a braking process, a dynamic brake function is provided by the electromechanical parking brake unit, and the control device determining the current vehicle deceleration from the deceleration measuring signal and comparing the current vehicle deceleration with a predetermined minimum deceleration value and if the determined current vehicle deceleration falls short of the pre-determined minimum deceleration value in the emergency operation mode, a static brake function is provided by the electromechanical parking brake unit.