Relay valve module for use as an axle modulator and trailer control module

Patent metadata

Field	Value
Publication number	US-11926294-B2
Application number	US-202117197112-A
Country	US
Kind code	B2
Filing date	Mar 10, 2021
Priority date	Sep 12, 2018
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

A relay valve module for an electronically controllable pneumatic brake system for actuating wheel brakes of a utility vehicle includes: a reservoir connection for receiving a reservoir pressure; a brake control pressure connection for receiving a brake control pressure; at least one first service brake connection for outputting a service brake pressure; a relay valve with a relay valve reservoir connection, which is connected to the reservoir connection, a relay valve working connection, which is connected to the first service brake connection, a relay valve ventilation connection, and a relay valve control connection; an electropneumatic pilot control unit, which is connected to the reservoir connection, the electropneumatic pilot control unit providing a pilot control pressure; and a shuttle valve with a first shuttle valve inlet, a second shuttle valve inlet, and a shuttle valve outlet. The first shuttle valve inlet is connected to the brake control pressure connection.

First claim

What claimed is:

1. A relay valve module for an electronically controllable pneumatic brake system for actuating wheel brakes of a utility vehicle, comprising:
a reservoir connection configured to receive a reservoir pressure;
a brake control pressure connection configured to receive a brake control pressure;
at least one first service brake connection configured to output a service brake pressure;
a relay valve with a relay valve reservoir connection, which is connected to the reservoir connection, a relay valve working connection, which is connected to the first service brake connection, a relay valve ventilation connection, and a relay valve control connection;
an electropneumatic pilot control unit, which is connected to the reservoir connection, the electropneumatic pilot control unit being configured to provide a pilot control pressure; and
a shuttle valve with a first shuttle valve inlet, a second shuttle valve inlet, and a shuttle valve outlet,
wherein the first shuttle valve inlet is connected to the brake control pressure connection to receive the brake control pressure, the second shuttle valve inlet is connected to the pilot control unit to receive the pilot control pressure, and the shuttle valve outlet is connected to the relay valve control connection to output to the relay valve control connection the respectively higher of the brake control pressure or the pilot control pressure.

2. The relay valve module of claim 1 , wherein the pilot control unit has an electrically switchable inlet valve and an electrically switchable outlet valve.

3. The relay valve module of claim 2 , wherein the inlet valve and the outlet valve each comprise 3/2 directional valves.

4. The relay valve module of claim 3 , wherein the inlet valve has a first inlet valve connection, which is connected to the reservoir connection, a second inlet valve connection, which is connected or connectable to a pilot control pressure line which leads to the second shuttle valve connection, and a third inlet valve connection.

5. The relay valve module of claim 4 , wherein the outlet valve has a first outlet valve connection, which is connected to the second inlet valve connection, a second outlet valve connection, which is connected to the pilot control pressure line, and a third outlet valve connection.

6. The relay valve module of claim 3 , wherein the outlet valve has a first outlet valve connection, which is connected to a vent, a second outlet valve connection, which is connected to the pilot control pressure line, and a third outlet valve connection.

7. The relay valve module of claim 6 , wherein the third inlet valve connection is connected to the third outlet valve connection.

8. The relay valve module of claim 1 , further comprising:
a pressure sensor configured to detect the service brake pressure and provide a corresponding brake pressure signal.

9. The relay valve module of claim 1 , wherein the relay valve module comprises an axle modulator comprising a front axle modulator, and
wherein the first service brake connection is provided for a first vehicle side, and
wherein the relay valve module further comprises a second service brake connection, which is connected to the relay valve working connection, configured to output the service brake pressure for a second vehicle side.

10. The relay valve module of claim 9 , further comprising:
a first ABS inlet valve and a second ABS inlet valve; and
a first ABS outlet valve and a second ABS outlet valve for at least one wheel brake cylinder of each side of the vehicle axle,
wherein each of the ABS inlet and outlet valves comprises a pressure-controlled diaphragm valve with an associated pilot control valve,
wherein each pilot control valve comprises a cyclically controllable 3/2 directional valves by which in each case one control pressure chamber of an associated diaphragm valve is selectively chargeable with service brake pressure or with control pressure picked off at the relay valve control connection of the relay valve or with ambient pressure.

11. The relay valve module of claim 1 , wherein the relay valve module comprises a trailer control module,
wherein the first service brake connection is configured to connect to a trailer control connection, and
wherein the relay valve module further comprises a trailer supply connection configured to connect to a trailer supply pressure connection to supply reservoir pressure to a trailer.

12. The relay valve module of claim 11 , wherein a rapid ventilation valve is connected to the trailer supply connection.

13. The relay valve module of claim 11 , wherein a further shuttle valve is connected to the brake control pressure connection, which further shuttle valve outputs to the brake control pressure connection the respectively higher of the brake control pressure and an anti jackknifing brake pressure.

14. An electronically controllable pneumatic brake system, comprising:
a front axle modulator comprising the relay valve module of claim 1 , the first service brake connection being provided for a first vehicle side, the relay valve module further comprising a second service brake connection, which is connected to the relay valve working connection, configured to output the service brake pressure for a second vehicle side;
a trailer control module comprising the relay valve module of claim 1 , the first service brake connection being configured to connect to a trailer control connection, the relay valve module further comprising a trailer supply connection configured to connect to a trailer supply pressure connection to supply reservoir pressure to a trailer;
a brake transducer with at least one pneumatic brake transducer connection and one electric brake transducer connection;
a central module; and
a rear axle modulator,
wherein the at least one pneumatic brake transducer connection is connected to the brake control pressure connection of the front axle modulator and/or to the brake control pressure connection of the trailer control module, and
wherein the electric brake transducer connection is connected to the central module.

15. A utility vehicle, comprising:
the electronically controllable pneumatic brake system of claim 14 .

16. A method for providing an axle modulator or a trailer control module, the method comprising:
providing a relay valve module for an electronically controllable pneumatic brake system for actuating wheel brakes of a utility vehicle, the relay valve module comprising:
a reservoir connection configured to receive a reservoir pressure;
a brake control pressure connection configured to receive a brake control pressure;
at least one first service brake connection configured to output a service brake pressure;
a relay valve with a relay valve reservoir connection, which is connected to the reservoir connection, a relay valve working connection, which is connected to the first service brake connection, a relay valve ventilation connection, and a relay valve control connection;
an electropneumatic pilot control unit, which is connected to the reservoir connection, the electropneumatic pilot control unit being configured to provide a pilot control pressure; and
a shuttle valve with a first shuttle valve inlet, a second shuttle valve inlet, and a shuttle valve outlet,
wherein the first shuttle valve inlet is connected to the brake control pressure connection to receive the brake control pressure, the second shuttle valve inlet is connected to the pilot control unit to receive the pilot control pressure, and the shuttle valve outlet is connected to the relay valve cont

Assignees

• Zf Cv Systems Hannover Gmbh
• Zf Cv Systems Europe Bv

Inventors

• Mueller Thomas
• Otremba Robert
• Van Thiel Julian
• Roters Gerd

Classifications

• B60T13/683 Primary

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

• B60T8/1708

  for lorries or tractor-trailer combinations · CPC title

• B60T8/171

  Detecting parameters used in the regulation; Measuring values used in the regulation · CPC title

• B60T8/176

  Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS (B60T8/1755 takes precedence) · CPC title

• B60T13/268

  using accumulators or reservoirs · CPC title