Electropneumatic trailer control-valve unit for North America

Patent metadata

Field	Value
Publication number	US-11338783-B2
Application number	US-201916571230-A
Country	US
Kind code	B2
Filing date	Sep 16, 2019
Priority date	Sep 14, 2018
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

An electropneumatic trailer control-valve unit for a vehicle includes a storage port for coupling a store of compressed air for a trailer, a brake-pressure port, and a brake-pressure pilot-control unit configured to output at least one first control pressure. The electropneumatic trailer control-valve unit further includes a brake-pressure main-valve unit configured to receive the first control pressure and to output a brake pressure at a brake-pressure port, a trailer operating-pressure port configured to receive a trailer operating pressure; and a pneumatically switched trailer protection valve with a protection-valve control port which is connected to the trailer operating-pressure port for receiving the trailer operating pressure. The trailer protection valve switches from a first switching position into a second switching position if the trailer operating pressure exceeds a predetermined first threshold value.

First claim

What is claimed is:

1. An electropneumatic trailer control-valve unit for a vehicle, the electropneumatic trailer control-valve unit comprising:
a storage port for coupling a store of compressed air for a trailer;
a brake-pressure port;
a brake-pressure pilot-control unit configured to output at least one first control pressure;
a brake-pressure main-valve unit configured to receive the first control pressure and to output a brake pressure at a brake-pressure port;
a trailer operating-pressure port configured to receive a trailer operating pressure;
a pneumatically switched trailer protection valve with a protection-valve control port which is connected to the trailer operating-pressure port for receiving the trailer operating pressure; and
a redundancy port at which a redundancy pressure is capable of being output and which is connected to the trailer protection valve in such a manner that in a second switching position of the trailer protection valve, the redundancy pressure capable of being transmitted to the brake pressure main valve unit,
wherein the trailer protection valve switches from a first switching position into the second switching position if the trailer operating pressure exceeds a predetermined first threshold value.

2. An electropneumatic trailer control module for a vehicle, the electropneumatic trailer control module comprising:
a trailer supply unit, including a trailer supply-pressure port and a supply pilot-control unit; and
a supply main-valve unit;
an electropneumatic trailer control-valve unit connected to the trailer supply unit as claimed in claim 1 ,
wherein the trailer supply unit is configured to output the trailer operating pressure at the trailer operating-pressure port.

3. The electropneumatic trailer control module as claimed in claim 2 , wherein the supply pilot-control unit has been designed to output a supply control pressure at the supply main-valve unit, and
wherein the supply main-valve unit has been designed to output a trailer supply pressure at the trailer supply-pressure port based on the reception of a third control pressure.

4. The electropneumatic trailer control module as claimed in claim 3 , wherein the trailer supply unit outputs the supply control pressure or the trailer supply pressure as trailer operating pressure at the trailer operating-pressure port.

5. The electropneumatic trailer control module as claimed in claim 2 , wherein the supply main-valve unit comprises a pneumatically controllable supply main valve with a pneumatic control port which is connected to the supply pilot-control unit via a supply control-pressure line, wherein the trailer operating-pressure port is connected to the supply control-pressure line.

6. The electropneumatic trailer control module as claimed in claim 2 , wherein the supply main-valve unit is connected to the trailer supply-pressure port via a trailer supply-pressure line, wherein the trailer operating-pressure port is connected to the trailer supply-pressure line.

7. The electropneumatic trailer control module as claimed in claim 2 , further comprising:
a parking-brake unit including a spring-actuator port a parking-brake pilot-control unit, and a parking-brake main-valve unit configured to output a spring-actuator pressure at the spring-actuator port.

8. The electropneumatic trailer control module as claimed in claim 2 , further comprising an electronic control unit (ECU) configured to control the brake-pressure pilot-control unit.

9. A utility vehicle with an electronically controllable pneumatic braking system with an electropneumatic trailer control module as claimed in claim 2 .

10. The electropneumatic trailer control-valve unit as claimed in claim 1 , wherein the trailer protection valve is configured to, in the second switching position, permit the output of the brake pressure.

11. The electropneumatic trailer control-valve unit as claimed in claim 10 , wherein the trailer protection valve is configured to, in the second switching position, permit a direct output of the brake pressure or an output of a second control pressure at the brake-pressure main-valve unit for the purpose of inducing an output of the brake pressure.

12. The electropneumatic trailer control-valve unit as claimed in claim 1 , wherein the brake-pressure pilot-control unit comprises an electromagnetically switchable redundancy valve, and wherein the trailer protection valve is connected to the redundancy valve.

13. The electropneumatic trailer control-valve unit as claimed in claim 12 , wherein the trailer protection valve and the redundancy valve have been integrated into a joint combined valve.

14. A utility vehicle with an electronically controllable pneumatic braking system with an electropneumatic trailer control-valve unit as claimed in claim 1 .

15. The electropneumatic trailer control-valve unit as claimed in claim 1 , comprising a brake-pressure sensor for registering the brake pressure.

16. A method for controlling an electropneumatic trailer control-valve unit, the method comprising:
receiving a trailer operating pressure at a protection-valve control port of a trailer protection valve;
providing a redundancy port at which a redundancy pressure is capable of being output; and
switching the trailer protection valve from a first switching position into a second switching position, wherein in the second switching position the redundancy pressure is capable of being transmitted to a brake pressure main valve unit.

17. The method as claimed in claim 16 , wherein the trailer operating pressure is a supply control pressure output by a supply pilot-control unit.

18. The method as claimed in claim 16 , wherein a brake pressure is capable of being output irrespective of a position of the trailer protection valve.

19. The method as claimed in claim 16 , further comprising:
registering the pressure at the brake-pressure port; and
ascertaining that a trailer has been attached to the brake-pressure port.

Assignees

• Wabco Gmbh
• Zf Cv Systems Europe Bv

Inventors

• Van Thiel Julian

Classifications

• B60T8/1701

  Braking or traction control means specially adapted for particular types of vehicles (for vehicles having more than one drive axle B60T8/1769) · CPC title

• B60T2270/413

  Plausibility monitoring, cross check, redundancy · CPC title

• B60T13/683 Primary

  in pneumatic systems or parts thereof (in vacuum systems B60T13/72) · CPC title

• B60T13/36

  direct, i.e. brakes applied directly by compressed air · CPC title

• B60T8/3605

  wherein the pilot valve is mounted in a circuit controlling the working fluid system · CPC title