Electropneumatic parking brake module with directly controlled valves and anti-compound connection

Patent metadata

Field	Value
Publication number	US-11964642-B2
Application number	US-201917261183-A
Country	US
Kind code	B2
Filing date	Jun 27, 2019
Priority date	Jul 20, 2018
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

An electropneumatic parking brake module includes a supply connection configured to connect a compressed air supply, at least one spring-type actuator connection configured to connect at least one spring brake cylinder, and an inlet-outlet valve unit configured to assume at least a first switching position and a second switching position. The parking brake module further includes an electropneumatic pilot control unit configured to output at least a first control pressure at the inlet-outlet valve unit. In the first switching position of the inlet-outlet valve unit, the spring-type actuator connection is connected to the supply connection for outputting a spring brake pressure, and, in the second switching position of the inlet-outlet valve unit, the spring-type actuator connection is connected to a venting connection of the inlet-outlet valve unit. The inlet-outlet valve unit is in the second switching position when the first control pressure is below a first threshold value.

First claim

The invention claimed is:

1. An electropneumatic parking brake module, comprising:
a supply connection configured to connect a compressed air supply,
at least one spring-type actuator connection configured to connect at least one spring brake cylinder,
an inlet-outlet valve unit configured to assume at least a first switching position and a second switching position,
an electropneumatic pilot control unit configured to output at least a first control pressure at the inlet-outlet valve unit, and
a release control connection at which a release control pressure is configured to be output by an external unit to initiate the inlet-outlet valve unit to switch to the first switching position,
wherein, in the first switching position of the inlet-outlet valve unit, the spring-type actuator connection is connected to the supply connection for outputting a spring brake pressure, and, in the second switching position of the inlet-outlet valve unit, the spring-type actuator connection is connected to a venting connection of the inlet-outlet valve unit, and
wherein the inlet-outlet valve unit is in the second switching position when the first control pressure is below a first threshold value.

2. The electropneumatic parking brake module as claimed in claim 1 , wherein the release control pressure is configured to be selectively output for exerting an anti-compound function and/or an emergency release function.

3. The electropneumatic parking brake module as claimed in claim 1 , wherein the release control pressure is a service brake pressure of a rear axle.

4. The electropneumatic parking brake module as claimed in claim 1 , wherein the pilot control unit has a ventilation connection which, for venting the first control pressure, is connected to the release control line which leads to the release control connection.

5. The electromagnetic parking brake module as claimed in claim 1 , having a switch valve which is disposed between the pilot control unit and the inlet-outlet valve unit, wherein the switch valve has a first switch valve connection configured to receive the first control pressure from the pilot control unit, a second switch valve connection that is connected to the release pressure connection, and a third switch valve connection that is connected to the inlet-outlet valve unit and selectively relays the first control pressure or the release control pressure to the inlet-outlet valve unit.

6. The electropneumatic parking brake module as claimed in claim 5 , wherein the switch valve is disposed between a bistable valve and a first 3/2-way valve, and wherein the first switch valve connection is connected to a second bistable valve connection, and the third switch valve connection is connected to a first control pressure.

7. The electropneumatic parking brake module as claimed in claim 1 , wherein the inlet-outlet valve unit has at least one first pneumatically controlled 3/2-way valve having exactly two switching positions.

8. The electropneumatic parking brake module as claimed in claim 7 , wherein the inlet-outlet valve unit has at least one 2/2-way check valve, and wherein the first 3/2-way valve serves as an inlet-outlet valve for the spring-type actuator connection for aerating and venting the spring-type actuator connection and the 2/2-way check valve serves to block an aeration and ventilation of the spring-type actuator connection.

9. The electropneumatic parking brake module as claimed in one claim 7 , wherein the first 3/2-way valve has an inlet connection, a working connection and a venting connection, and the first 3/2-way valve is formed to reciprocally connect the working connection to the inlet connection and the venting connection.

10. The electropneumatic parking brake module as claimed in claim 9 , wherein the 2/2-way check valve has a first check valve connection and a second check valve connection, wherein the first check valve connection is connected to the working connection, and the second check valve connection is connected to the spring-type actuator connection.

11. The electropneumatic parking brake module as claimed in claim 1 , wherein, in the first switching position of the inlet-outlet valve unit, the spring brake pressure can be fed through directly from the supply connection to the spring-type actuator connection.

12. The electropneumatic parking brake module as claimed in claim 1 , wherein the inlet-outlet valve unit has at least one 2/2-way check valve.

13. The electropneumatic parking brake module as claimed in claim 1 , wherein the electropneumatic pilot control unit has at least a second 3/2-way valve, wherein the second 3/2-way valve is provided to output the first control pressure.

14. The electropneumatic parking brake module as claimed in claim 13 , wherein the second 3/2-way valve is a bistable valve.

15. The electropneumatic parking brake module as claimed in claim 14 , wherein the bistable valve has a first bistable valve connection, a second bistable valve connection and a third bistable valve connection, wherein the first bistable valve connection is connected to the supply connection, the second bistable valve connection is configured to output the first control pressure and the first control pressure is configured to be vented via the third bistable valve connection.

16. The electropneumatic parking brake module as claimed in claim 7 , wherein a second bistable valve connection is connected to or configured to be connected to a first control input of the at least one first pneumatically controlled 3/2-way valve by a first pneumatic control line.

17. The electropneumatic parking brake module as claimed in claim 16 , wherein the release control pressure is configured to be output directly into the first pneumatic control line.

18. The electropneumatic parking brake module as claimed in claim 1 , wherein the electropneumatic pilot control unit has a monostable inlet-outlet valve combination with an inlet valve and an outlet valve for outputting the first control pressure.

19. The electropneumatic parking brake module as claimed in claim 18 , further comprising a return line which provides the pressure output by a first 3/2-way valve as the first control pressure at the inlet-outlet valve unit.

20. The electropneumatic parking brake module as claimed in claim 19 , wherein the pressure output by the first 3/2-way valve is provided in a throttled manner as the first control pressure via the return line at the inlet-outlet valve unit.

21. The electropneumatic parking brake module as claimed in claim 19 , wherein the return line is connected directly to the inlet-outlet valve unit.

22. The electropneumatic parking brake module as claimed in claim 19 , wherein the inlet valve has a third inlet valve connection connected to the return line, wherein, in a first switching position of the inlet valve, a second inlet valve connection is connected to a first inlet valve connection, and, in a second switching position of the inlet valve, the second inlet valve connection is connected to the third inlet valve connection.

23. The electropneumatic parking brake module as claimed in claim 22 , having a switch valve which is disposed between the pilot control unit and the inlet-outlet valve unit,
wherein the switch valve has a first switch valve connection configured to receive the first control pressure from the pilot control unit, a second switch valve connection that is connected to the release pressure connection, and a third switch valve

Assignees

• Wabco Gmbh
• Zf Cv Systems Europe Bv

Inventors

• Van Thiel Julian

Classifications

• B60T13/683 Primary

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

• B60T13/26

  Compressed-air systems · CPC title

• B60T13/662

  characterised by specified functions of the control system components · CPC title

• B60T7/20

  specially for trailers, e.g. in case of uncoupling of {or overrunning by} trailer (inertia-actuated overrun brakes B60T13/08) · CPC title

• 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