Electronically controllable pneumatic braking system in a commercial vehicle and method for electronically controlling a pneumatic braking system

Patent metadata

Field	Value
Publication number	US-10730499-B2
Application number	US-201615746805-A
Country	US
Kind code	B2
Filing date	Jun 24, 2016
Priority date	Sep 2, 2015
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

An electronically controllable pneumatic brake system includes a brake circuit, wherein a control valve is associated with the brake circuit for the purpose of adjusting braking pressures at service brakes independently of each other, wherein the control valve comprises an electronic control input for receiving an electrical control signal and a pneumatic control input for receiving a control pressure. The pneumatic brake system additionally includes a first control unit for outputting the electronic control signal depending on a target vehicle deceleration for the electrical actuation of the control valve, a first brake valve configured to specify a first brake valve control pressure, and a second brake valve configured to output a second brake valve control pressure. The second brake valve is disposed such that the first brake valve control pressure and/or the second brake valve control pressure is output as the control pressure to the control valve.

First claim

The invention claimed is:

1. An electronically controllable pneumatic brake system, comprising:
a brake circuit, wherein in the brake circuit, braking pressures at service brakes are adjustable independently of each other, wherein, for the purpose of adjusting, at least one control valve is associated with the brake circuit, wherein the control valve comprises an electronic control input for receiving an electrical control signal and a pneumatic control input for receiving a control pressure, and wherein the control valve is configured to supply the service brakes of the brake circuit with a braking pressure via working connections depending on the control signals or the control pressure,
a first control unit for outputting the electronic control signal depending on a target vehicle deceleration for the electrical actuation of the control valve, wherein the target vehicle deceleration can be specified by a first brake valve, and
the first brake valve, configured to specify a first brake valve control pressure at the at least one brake circuit,
a second brake valve configured to output a second brake valve control pressure, the second brake valve being disposed in the pneumatic brake system such that the first brake valve control pressure of the first brake valve and/or the second brake valve control pressure of the second brake valve is output as the control pressure to the control valve for the pneumatic actuation of the control valve,
wherein the second brake valve is configured to be electronically controlled if electrical actuation of the control valve is prevented to create an electronically-pneumatically controlled redundancy.

2. The electronically controllable pneumatic brake system as claimed in claim 1 , wherein, depending on the control signal or the control pressure, the control valve supplies the service brakes of the brake circuit with a braking pressure proportional to the control signal or to the control pressure.

3. The electronically controllable pneumatic brake system as claimed in claim 1 , wherein the control valve comprises a directional valve that can be actuated by the first control unit, in particular in a pulsed manner, to supply the service brakes with the braking pressure.

4. The electronically controllable pneumatic brake system as claimed in claim 1 , wherein the first brake valve and the second brake valve are connected via compressed air lines to a shuttle valve to adjust the first brake valve control pressure through the first brake valve and the second brake valve control pressure through the second brake valve to the shuttle valve,
wherein the shuttle valve is connected to the pneumatic control input of the control valve and the shuttle valve only passes a selected brake valve control pressure, in particular the higher, of the brake valve control pressures adjusted by the two brake valves as the control pressure to the pneumatic control input of the control valve to provide redundancy.

5. The electronically controllable pneumatic brake system as claimed in claim 4 , wherein the shuttle valve is integrated within the control valve of the brake circuit or the first brake valve or the second brake valve.

6. The electronically controllable pneumatic brake system as claimed in claim 1 , wherein the first brake valve and the second brake valve are connected via compressed air lines to a T-piece to adjust the first brake valve control pressure through the first brake valve and the second brake valve control pressure through the second brake valve at the T-piece,
wherein the T-piece is connected to the pneumatic control input of the control valve and the T-piece passes a sum or an average value of the brake valve control pressures adjusted by the first and second brake valves in the brake circuit as the control pressure to the pneumatic control input of the control valve to provide redundancy.

7. The electronically controllable pneumatic brake system as claimed in claim 1 , wherein the control valve is implemented as a relay valve, wherein the relay valve comprises a first relay valve control input for receiving the control pressure as a relay valve control pressure, a second relay valve control input for receiving the electronic control signal as a relay valve control signal, and relay valve working connections for outputting a braking pressure to the service brakes, wherein the braking pressure is proportional to the relay valve control pressure or to the relay valve control signal.

8. The electronically controllable pneumatic brake system as claimed in claim 7 , wherein the relay valve can only be pneumatically actuated by means of the relay valve control pressure if electrical actuation by means of the relay valve control signal is prevented.

9. The electronically controllable pneumatic brake system as claimed in claim 1 , wherein the control valve is implemented as an axle modulator, wherein the axle modulator comprises a first axle modulator control input for receiving an axle modulator control signal, a second axle modulator control input for receiving an axle modulator control pressure and axle modulator working connections for outputting a braking pressure to the service brakes, wherein the braking pressure is proportional to the axle modulator control pressure or to the axle modulator control signal.

10. The electronically controllable pneumatic brake system as claimed in claim 9 , wherein the axle modulator can only be pneumatically actuated by means of the axle modulator control pressure if electrical actuation by means of the axle modulator control signal is prevented.

11. The electronically controllable pneumatic brake system as claimed in claim 1 , wherein the brake system is implemented as a dual-circuit brake system including the brake circuit and a second brake circuit, the brake system further comprising:
a second control valve associated with the second brake circuit,
wherein the second control valves is configured to be electrically controlled by means of a second electronic control signal and also pneumatically controlled by means of a second control pressure.

12. The electronically controllable pneumatic brake system as claimed in claim 1 , wherein the first brake valve is implemented as a brake value transmitter and the brake value transmitter is configured to output a first brake valve control pressure that is proportional to an operation of a brake pedal by a driver for the brake circuit and/or is configured to transmit an electrical actuation signal that is proportional thereto to the first control unit.

13. The electronically controllable pneumatic brake system as claimed in claim 1 , wherein the second brake valve is a proportionality valve, which depending on an electrical demand signal outputs a second brake valve control pressure that is proportional thereto.

14. The electronically controllable pneumatic brake system as claimed in claim 13 , wherein a 1-channel proportionality valve is provided in the second brake valve for the brake circuit, wherein the 1-channel proportionality valve outputs a second brake valve control pressure to the brake circuit or the second brake valve is implemented as a multi-channel proportionality valve, which outputs the second brake valve control pressures for the brake circuit and for one or more additional brake circuits pneumatically independently of each other.

15. The electronically controllable pneumatic brake system as claimed in claim 13 , wherein the second brake valve is implemented as an axle modulator, in particular a 1-channel-axle modulator or a 2-channel-axle modulator.

16. The electronically controllab

Assignees

• Wabco Gmbh

Inventors

• Otremba Robert

Classifications

• B60T15/027

  in pneumatic systems · CPC title

• B60T7/042

  by electrical means, e.g. using travel or force sensors · 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

• B60T13/26

  Compressed-air systems · CPC title