Method and system for analyzing the wear behavior of brake pads/linings

Patent metadata

Field	Value
Publication number	US-10655696-B2
Application number	US-201815880793-A
Country	US
Kind code	B2
Filing date	Jan 26, 2018
Priority date	Jul 27, 2015
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A method for analyzing the wear behavior of brake pads of a brake system has at least the following steps: a) providing a brake system with at least one or more brakes, each with one or more brake pads which each have a pad carrier plate and a friction lining composed of at least two or more friction material layers which are composed of different friction materials; and at least one evaluation device; b) determining the wear which is brought about per brake during braking operations with at least one wear sensor per brake; c) determining the braking energy which is brought about per brake during braking operations with the evaluation device; d) repeated determination of an instantaneous gradient of a curve which relates the values determined in steps b) and c) and preferably a route information item to one another; and e) outputting a signal at an output device if the gradient changes.

First claim

What is claimed is:

1. A method for analyzing wear behavior of brake pads, the method comprising the steps of:
a) providing a brake system comprising an evaluation device and at least one or more brakes, each brake including one or more brake pads which have a pad carrier plate and a friction lining composed of two or more layers of friction material having different coefficients of friction;
b) determining wear per brake which occurs during braking by way of at least one wear sensor per brake;
c) determining braking energy per brake during braking by way of the evaluation device;
d) repeatedly determining a momentary increase in a curve correlating values determined in steps b) and c) to each other; and
e) emitting a signal to an output device when the momentary increase changes.

2. The method as claimed in claim 1 , wherein
a signal is emitted at the output device in step e) at least when a slope exceeds a prescribed limiting value.

3. The method as claimed in claim 1 , wherein
a signal is emitted by an output device in step e) at least when a slope exceeds a tolerance range or a tolerance band.

4. The method as claimed in claim 1 , wherein
all of the brake pads of the brake system have a lining carrier plate and a friction lining composed of two or more layers.

5. The method as claimed in claim 1 , wherein
a thickness of at least one of the layers of friction material in the at least one brake pad corresponds to a final wear level of said brake pad, and wherein a signal is emitted when said final wear level is detected.

6. The method as claimed in claim 1 , wherein step d) further correlate route information.

7. A brake system, comprising:
at least one or more brakes, each brake including one or more brake pads which have a pad carrier plate and a friction lining composed of two or more layers of friction material having different coefficients of friction and composed of different friction materials; and
at least one evaluation device, the evaluation device being configured to execute a process to:
a) determine wear per brake which occurs during braking by way of at least one wear sensor per brake;
b) determine braking energy per brake during braking by way of the evaluation device;
c) repeatedly determine a momentary increase in a curve correlating values determined in steps b) and c) to each other; and
d) emit a signal to an output device when the momentary increase changes.

8. The brake system as claimed in claim 7 , wherein
a thickness of at least one of the layers of friction material in the at least one brake pad corresponds to a final wear level of said brake pad.

9. The brake system as claimed in claim 8 , wherein
the thickness of one of the outer layers of friction material is greater than the thickness of the inner layer of friction material.

10. The brake system as claimed in claim 9 , wherein the brakes are disc brakes.

11. The brake system as claimed in claim 10 , wherein the disc brakes are configured as pneumatic disc brakes.

12. The brake system as claimed in claim 7 , wherein step c) further correlates route information.

13. A brake pad for use in a brake system comprising at least one or more brakes, and at least one evaluation device configured to execute a process to: a) determine wear per brake which occurs during braking by way of at least one wear sensor per brake; b) determine braking energy per brake during braking; c) repeatedly determine a momentary increase in a curve correlating values determined in steps b) and c) to each other; and d) emit a signal to an output device when the momentary increase changes, comprising:
a pad carrier plate and a friction lining composed of at least two or more layers of friction material with different coefficients of friction, wherein
a thickness of one of the friction material layers corresponds to a final wear level of the brake pad.

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Schoenauer Manfred
• Pahle Wolfgang
• Dresen Dirk

Classifications

• B60T17/221

  Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems (hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M) · CPC title

• F16D66/027 Primary

  Sensors therefor · CPC title

• B60T8/885

  using electrical circuitry · CPC title

• F16D2069/002

  Combination of different friction materials · CPC title

• B60T17/22 Primary

  Devices for monitoring or checking brake systems; Signal devices · CPC title