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 t
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.
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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 s
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, whereinthe 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. 2. The parking brake as claimed in claim 1, wherein the drum brake is a duo-servo type drum brake. 3. The parking brake as claimed in claim 1, wherein the spring energy storage device is configured as a diaphragm spring assembly. 4. The parking brake as claimed in claim 1, wherein the first length of axial travel (s0+s1) travelled by the expander element is set in the case of the slope, the inclination of which is below a threshold value, and the second length of axial travel (s0+s1′+s1), which is greater than the first length of axial travel (s0+s1) by an additional length of travel component (s1′), is set in the case of the slope, the inclination of which is equal to the threshold value or above the threshold value, the additional length of travel component (s1′) taking into account the length of travel used by the parking brake when parking on the slope owing to the additional application force required. 5. The parking brake as claimed in claim 1, wherein the set length of axial travel of the expander element is further settable as a function of the brake and/or engine temperature of the motor vehicle. 6. The parking brake as claimed in claim 5, wherein detection means are provided which detect the temperature profile of the brake after the motor vehicle has been parked, and wherein the temperature profile detected is taken into account when the length of travel travelled by the expander element is being set. 7. A method for actuating a parking brake, the parking brake 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 in the expanding motion 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 a 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. 8. The method as claimed in claim 7, wherein the first length of axial travel (s0+s1) travelled by the expander element is set in the case of the slope, the inclination of which is below a threshold value, and the second length of axial travel (s0+s1+s1′), which is greater than the first length of axial travel (s0+s1) by a length of travel component (s1′), is set in the case of the slope, the inclination of which is equal to the threshold value or above the threshold value, the length of travel component (s1′) taking into account the length of travel used up by the parking brake when parking on the slope. 9. The method as claimed in claim 7, wherein the set length of axial travel of the expander element is further set as a function of a brake and/or engine temperature of the motor vehicle. 10. The method as claimed in claim 9, wherein a temperature profile of the brake is detected after the motor vehicle has been parked, and wherein the temperature profile detected is taken into account when the length of travel to be travelled by the expander element is being set.
Gädke, Martin; Bach, Uwe; Becker, Stephan; van Aken, Volker; von Hayn, Holger; Hoffmann, Jens; Sefo, Ahmed; Ritter, Wolfgang, Drum brake module which can be operated by electric motor.
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