METHOD FOR OPERATING A BRAKING SYSTEM FOR A MOTOR VEHICLE, CORRESPONDING BRAKING SYSTEM FOR A MOTOR VEHICLE AND COMPUTER PROGRAM PRODUCT

Abstract

A method for operating a braking system for a motor vehicle, which has a service brake device with at least one wheel brake and a brake pressure applied to the wheel brake for generating a braking force acting on a brake disc of the wheel brake is adjusted at least temporarily depending on a setting of an operating element. A condition of a coating of a brake disc of the wheel brake is determined based on the brake pressure applied to the wheel brake and a deceleration of the motor vehicle resulting therefrom.

Claims

1. A method for operating a braking system for a motor vehicle, which has a service brake device with at least one wheel brake and a brake pressure applied to the wheel brake for generating a braking force acting on a brake disc of the wheel brake is at least temporarily adjusted depending on a setting of an operating element, wherein a condition of a coating of a brake disc of the wheel brake is determined on the basis of the brake pressure applied to the wheel brake and a deceleration of the motor vehicle resulting therefrom.

2. The method according to claim 1, wherein a brake disc provided with the coating by laser coating is used as the brake disc.

3. The method accordingly to claim 1, wherein if the deceleration deviates from a deceleration target value stored for the brake pressure, a defect in the coating is detected.

4. The method according to claim 1, wherein a vehicle weight of the motor vehicle is determined and a deceleration force acting on the motor vehicle is calculated on the basis of the vehicle weight from the deceleration of the motor vehicle.

5. The method according to claim 1, wherein a friction coefficient of the wheel brake is determined based on the brake pressure and the deceleration force.

6. The method according to claim 1, wherein, if the friction coefficient deviates from a coefficient target value, the defect in the coating is detected.

7. The method according to claim 1, wherein the deceleration target value and/or the coefficient target value are determined and stored during a running-in operation of the braking system.

8. The method according to claim 1, wherein the defect in the coating is only detected if the deceleration deviates several times from the deceleration target value and/or the friction coefficient deviates several times from the coefficient target value.

9. A braking system for a motor vehicle, in particular for carrying out the method according to claim 1, wherein the braking system has a service brake device with at least one wheel brake and is provided and designed to adjust a brake pressure applied to the wheel brake for generating a braking force acting on a brake disc of the wheel brake at least temporarily depending on a setting of an operating element, wherein the braking system is further provided and designed to determine a condition of a coating of a brake disc of the wheel brake on the basis of the brake pressure applied to the wheel brake and a deceleration of the motor vehicle resulting therefrom.

10. A computer program product comprising instructions which cause a braking system to carry out the method according to claim 1.

11. The method according to claim 2, wherein if the deceleration deviates from a deceleration target value stored for the brake pressure, a defect in the coating is detected.

12. The method according to claim 2, wherein a vehicle weight of the motor vehicle is determined and a deceleration force acting on the motor vehicle is calculated on the basis of the vehicle weight from the deceleration of the motor vehicle.

13. The method according to claim 3, wherein a vehicle weight of the motor vehicle is determined and a deceleration force acting on the motor vehicle is calculated on the basis of the vehicle weight from the deceleration of the motor vehicle.

14. The method according to claim 2, wherein a friction coefficient of the wheel brake is determined based on the brake pressure and the deceleration force.

15. The method according to claim 3, wherein a friction coefficient of the wheel brake is determined based on the brake pressure and the deceleration force.

16. The method according to claim 4, wherein a friction coefficient of the wheel brake is determined based on the brake pressure and the deceleration force.

17. The method according to claim 2, wherein, if the friction coefficient deviates from a coefficient target value, the defect in the coating is detected.

18. The method according to claim 3, wherein, if the friction coefficient deviates from a coefficient target value, the defect in the coating is detected.

19. The method according to claim 4, wherein, if the friction coefficient deviates from a coefficient target value, the defect in the coating is detected.

20. The method according to claim 5, wherein, if the friction coefficient deviates from a coefficient target value, the defect in the coating is detected.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0029] In the following, the invention will be explained in greater detail with reference to the exemplary embodiment depicted in the drawings, without this restricting the invention. In particular, the only

[0030] FIG. 1 is a schematic representation of a region of a braking system for a motor vehicle.

DETAILED DESCRIPTION

[0031] FIG. 1 is a schematic representation of a region of a braking system for a motor vehicle. The braking system 1 has a service brake device 2, which in turn has a wheel brake 3 shown here. The wheel brake 3 is assigned to a wheel of the motor vehicle or a wheel axle of the motor vehicle. It has a brake disc 4 and a brake caliper 5, on which brake pads (not shown here) are arranged on opposite sides of the brake disc 4. To generate a braking force, a brake pressure is applied to the wheel brake 3. As a result, the brake pads are pressed by the brake caliper 5 onto the brake disc 4, so that the braking force is present due to the frictional connection between the brake disc 4 and the brake pads. The brake disc 4 is provided with a coating, in particular made of a hard material, in order to reduce abrasion occurring during the generation of the braking force.

[0032] In order to reliably comply with the emission limits specified for the braking system, it is necessary to monitor the condition of the coating 6. For this purpose, the brake pressure applied to the wheel brake 3 and a deceleration of the motor vehicle resulting from the brake pressure are used. In other words, the condition of the coating 6 results as a function of the brake pressure and the deceleration of the motor vehicle, which is achieved by means of the wheel brake 3. For example, a pressure/deceleration characteristic curve stored in a control unit of the braking system 1 is used for this purpose. However, it can also be provided that a currently existing friction coefficient of the wheel brake 3 or between the brake disc 4 and the brake pads is determined and compared with a target value. In any case, the condition of the coating 6 is reliably detected and, in particular, it is determined if there is a defect in the coating 6. In this case, a defect signal is preferably generated and/or the defect is displayed to a driver of the motor vehicle. Thus, the emission limits can be reliably complied with by the braking system 1.

LIST OF REFERENCE NUMERALS

[0033] 1 Braking system [0034] 2 Service brake device [0035] 3 Wheel brake [0036] 4 Brake disc [0037] 5 Brake caliper [0038] 6 Coating