Electromechanically actuable parking brake for motor vehicles and a method for actuating the same

摘要

A system and method for an electromechanically actuable parking brake for motor vehicles, which is embodied as a drum brake of the “duo-servo” type. The parking brake has a brake actuating device which can be actuated by an electromechanical actuator, is designed as an expander element and acts on two brake shoes, the expander element being supported via a spring energy storage device, may be designed as a diaphragm spring assembly, and being spreadable by a predetermined length of travel, when the parking brake is actuated, to apply an application force. In order to provide a sufficiently large hot parking travel, the length of travel travelled by the expander element to apply the application force when the parking brake is actuated can be moved as a function of at least one motor vehicle state parameter.

主权项

1. An electromechanically actuable parking brake for motor vehicles, comprising a drum brake and a control unit, the drum brake having a brake actuating device, actuated by an electromechanical actuator and configured as an expander element which acts on two brake shoes; the expander element being supported via a spring energy storage device, and being spreadable by a predetermined length of travel, when the parking brake is actuated, to apply an application force,
wherein the control unit sets a length of axial travel travelled by the expander element to apply the application force when the parking brake is actuated as a function of at least one motor vehicle state parameter, the at least one motor vehicle state parameter including an inclination of a slope on which the vehicle is parked, such that when the vehicle is parked on a slope having an actual inclination, the control unit sets a first length of axial travel greater than predetermined travel length, the first length determined as a function of the actual inclination of the slope, and a second, different length of axial travel greater than the predetermined travel length when the actual inclination of the slope is above a predetermined threshold value.