Vehicle braking systems and methods

Patent metadata

Field	Value
Publication number	US-11767896-B2
Application number	US-202017033532-A
Country	US
Kind code	B2
Filing date	Sep 25, 2020
Priority date	Apr 17, 2013
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

A method in which at least one piezoceramic sensor, which converts every mechanical force to which it is subjected into an electrical signal and having a Curie temperature higher than 200° C., is solidarized directly onto the surface of a metal support element of a vehicle braking element, which during use faces a vehicle element to be braked. While in contact with such a surface, an electrical circuit is implemented that picks up and eventually processes the electrical signal, the electrical circuit being connected with a connector integrated with the metal support element. An electrically insulating layer sandwiches the at least one piezoceramic sensor and the electrical circuit, and a block of friction material with an underlying damping layer is formed upon the electrically insulating layer. After forming the block of friction material, the piezoceramic sensor is polarized by applying a predetermined potential difference thereto by means of the connector.

First claim

What is claimed is:

1. A method of controlling a braking system, the method comprising:
with a processor, processing an electrical signal received from a braking element, the braking element comprising a support element, a friction material attached to the support element, and a piezoceramic sensor positioned between the support element and the friction material, the electrical signal generated in response to actuation of the piezoceramic sensor according to a piezoelectric effect;
detecting whether or not the braking system has been activated; and
in response to the processing and the detecting, controlling actuation of the braking element, wherein said controlling actuation of the braking element comprises, in response to determining that the piezoceramic sensor has been activated while the braking system has not been activated, retracting the braking element.

2. A method of controlling a braking system, the method comprising:
with a processor, processing an electrical signal received from a braking element, the braking element comprising a support element, a friction material attached to the support element, and a piezoceramic sensor positioned between the support element and the friction material, the electrical signal generated in response to actuation of the piezoceramic sensor according to a piezoelectric effect;
detecting whether or not the braking system has been activated; and
in response to the processing and the detecting, activating a user alert relating to the braking system, wherein said activating a user alert comprises, in response to determining that the piezoceramic sensor has been activated while the braking system has not been activated, activating an alert indicating that the braking element is not correctly adjusted.

3. A method of controlling a braking system, the method comprising:
with a processor, processing an electrical signal received from a braking element, the braking element comprising a support element, a friction material attached to the support element, and a piezoceramic sensor positioned between the support element and the friction material, the electrical signal generated in response to actuation of the piezoceramic sensor according to a piezoelectric effect;
detecting whether or not the braking system has been activated; and
in response to the processing and the detecting, controlling actuation of the braking element, wherein said controlling actuation of the braking element or comprises, in response to determining that the piezoceramic sensor has been activated while the braking system has also been activated, adjusting actuation of the braking element.

4. The method of claim 3 , wherein said processing comprises measuring pressure applied by the braking element, and wherein said controlling actuation of the braking element or activating a user alert comprises adjusting pressure applied by the braking element.

5. A system for a motorized vehicle, the system comprising:
a braking element comprising a support element, a friction material attached to the support element, and at least one piezoceramic sensor positioned between the support element and the friction material;
a processor configured to:
process an electrical signal generated in response to actuation of the at least one piezoceramic sensor according to a piezoelectric effect to determine that the at least one piezoceramic sensor has been activated;
determine whether or not a braking system including the braking element has been activated; and
control actuation of the braking element to retract the braking element in response to determining that the at least one piezoceramic sensor has been activated while the braking system has not been activated.

6. The system of claim 5 wherein the at least one piezoceramic sensor comprises a plurality of piezoceramic sensors.

7. The system of claim 6 wherein the plurality of piezoceramic sensors comprises four sensors arranged in a symmetric array.

8. The system of claim 6 wherein the plurality of piezoceramic sensors comprises five sensors including four sensors arranged symmetrically about a centrally located fifth sensor.

9. The system of claim 6 wherein the plurality of piezoceramic sensors comprise a plurality of pressure sensors and at least one shear sensor.

10. A system for a motorized vehicle, the system comprising:
a braking element comprising a support element, a friction material attached to the support element, and at least one piezoceramic sensor positioned between the support element and the friction material;
a processor configured to:
process an electrical signal generated in response to actuation of the at least one piezoceramic sensor according to a piezoelectric effect to determine that the at least one piezoceramic sensor has been activated;
determine whether or not a braking system including the braking element has been activated; and
activate an alert indicating that the braking element is not correctly adjusted in response to determining that the at least one piezoceramic sensor has been activated while the braking system has not been activated.

11. The system of claim 10 wherein the at least one piezoceramic sensor comprises a plurality of piezoceramic sensors.

12. The system of claim 11 wherein the plurality of piezoceramic sensors comprises four sensors arranged in a symmetric array.

13. The system of claim 11 wherein the plurality of piezoceramic sensors comprises five sensors including four sensors arranged symmetrically about a centrally located fifth sensor.

14. The system of claim 11 wherein the plurality of piezoceramic sensors comprise a plurality of pressure sensors and at least one shear sensor.

15. A system for a motorized vehicle, the system comprising:
a braking element comprising a support element, a friction material attached to the support element, and at least one piezoceramic sensor positioned between the support element and the friction material;
a processor configured to:
process an electrical signal generated in response to actuation of the at least one piezoceramic sensor according to a piezoelectric effect to determine that the at least one piezoceramic sensor has been activated;
determine whether or not a braking system including the braking element has been activated; and
control actuation of the braking element to adjust actuation of the braking element in response to determining that that the at least one piezoceramic sensor has been activated while the braking system has also been activated.

16. The system of claim 15 wherein the processor is configured to determine that the at least one piezoceramic sensor has been activated by processing the electrical signal to measure pressure applied by the braking element, and the processor is configured to control actuation of the braking element to adjust actuation of the braking element by adjusting pressure applied by the braking element.

17. The system of claim 15 wherein the at least one piezoceramic sensor comprises a plurality of piezoceramic sensors.

18. The system of claim 17 wherein the plurality of piezoceramic sensors comprises five sensors including four sensors arranged symmetrically about a centrally located fifth sensor.

19. The system of claim 17 wherein the plurality of piezoceramic sensors comprise a plurality of pressure sensors and at least one shear sensor.

Assignees

• Itt Italia Srl

Inventors

• Martinotto Luca
• Merlo Fabrizio
• Donzelli Daniele

Classifications

• F16D66/00 Primary

  Arrangements for monitoring working conditions, e.g. wear, temperature · CPC title

• B60T17/22

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

• F16D65/0006

  Noise or vibration control · CPC title

• F16D65/08

  for internally-engaging brakes · CPC title

• F16D65/092

  for axially-engaging brakes, e.g. disc brakes · CPC title