Electronically controlled operating brake system having backup control pressure generated on a basis of an additional compressed air consumer circuit

Patent metadata

Field	Value
Publication number	US-12447940-B2
Application number	US-202217948687-A
Country	US
Kind code	B2
Filing date	Sep 20, 2022
Priority date	Mar 24, 2020
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

An electronically controlled pneumatic operating brake system, having a backup control pressure for a pneumatic fall back level, wherein the backup control pressure is generated from a compressed air supply which is independent from two compressed air supplies for a front axle circuit and a rear axle circuit. This assures additional pneumatic redundancy and facilitates omitting a pneumatic channel in a foot brake module.

First claim

What is claimed is:

1. An electronically controlled pneumatic operating brake system, comprising:
a first electronic control;
a first brake circuit including a first compressed air supply and a first control valve;
a second brake circuit including a second compressed air supply independent from the first compressed air supply and a second control valve, wherein the first brake circuit is supplied with compressed air from the first compressed air supply and the second brake circuit is supplied with compressed air from the second compressed air supply,
wherein at least one first brake pressure is controllable by the first control valve at at least one first pneumatic operating output of the first control valve in the first brake circuit based on compressed air from the first compressed air supply, and at least one second brake pressure is controllable by the second control valve at at least one second pneumatic operating output of the second control valve in the second brake circuit based on compressed air from the second compressed air supply, wherein at least one pneumatic operating brake actuator of the first brake circuit is connected at the at least one first pneumatic operating output and at least one pneumatic operating brake actuator of the second brake circuit is connected at the at least one second pneumatic operating output,
wherein the first control valve includes a first electrical control input configured to receive a first electrical control signal and a first pneumatic control input configured to receive a first pneumatic control pressure (SD) and the second control valve includes a second electrical control input configured to receive a second electrical control signal and a second pneumatic control input configured to receive a second pneumatic control pressure (SD),
wherein the first electronic control generates the first electrical control signal as a function of a nominal vehicle deceleration and feeds the first electrical control signal to the first electrical control input of the first control valve and generates the second electrical control signal and feeds the second electrical control signal to the second electrical control input of the second control valve,
wherein control signal generation devices are provided that generate the first pneumatic control pressure (SD) as a function of the nominal vehicle deceleration and feed the first pneumatic control pressure (SD) to the first pneumatic control input of the first control valve and generate the second pneumatic control pressure (SD) and feed the second pneumatic control pressure to the second pneumatic control input of the second control valve;
a third compressed air consumer circuit that is independent from the first brake circuit and the second brake circuit and supplied with compressed air by a third compressed air supply that is independent from the first compressed air supply and the second compressed air supply,
wherein a pneumatic supply connection of the control signal generation devices is supplied with compressed air by a greater supply pressure of a first supply pressure in the first compressed air supply and a second supply pressure in the second compressed air supply, or is supplied with compressed air by a third supply pressure of the third compressed air supply, and
wherein the control signal generation devices are configured to generate the first pneumatic control pressure (SD) and feed the first pneumatic control pressure to the first pneumatic control input and generate the second pneumatic control pressure (SD) and feed the second pneumatic control pressure to the second pneumatic control input based on the first supply pressure, the second supply pressure or the third supply pressure provided to the supply connection of the control signal generation devices.

2. The electronically controlled pneumatic operating brake system according to claim 1 , wherein the nominal vehicle deceleration is predetermined by an actuation of a foot brake pedal of a foot brake module or by an autopilot device or by a driver assist system.

3. The electronically controlled pneumatic operating brake system according to claim 2 ,
wherein the foot brake module includes a first electrical channel, and
wherein a first electrical brake request signal (BAS 1 ) is generated in the first electrical channel as a function of the actuation of the foot brake pedal and fed to the first electronic control which generates the first electrical control signal as a function of the first brake request signal (BAS 1 ) and feeds the first electrical control signal to the first electrical control input and generates the second electrical control signal and feeds the second electrical control signal to the second electrical control input.

4. The electronically controlled pneumatic operating brake system according to claim 3 ,
wherein the foot brake module includes a second electrical channel, and
wherein a second electrical brake request signal (BAS 2 ) is generated in the second electrical channel as a function of the actuation of the foot brake pedal.

5. The electronically controlled pneumatic operating brake system according to claim 4 ,
wherein the control signal generation devices include a magnet valve device and a second electronic control, and
wherein the second electronic control generates a third electrical control signal as a function of the second electrical brake request signal (BAS 2 ) or as a function of a second brake request signal (BAS 2 *) and feeds the third electrical control signal to the magnet valve device which generates the first pneumatic control pressure (SD) as a function of the third electrical control signal and feeds the first pneumatic control pressure (SD) to the first pneumatic control input and generates the second pneumatic control pressure (SD) and feeds the second pneumatic control pressure (SD) to the second pneumatic control input.

6. The electronically controlled pneumatic operating brake system according to claim 5 , wherein the first electronic control is supplied with electrical energy by a first electrical energy supply which is independent from a second electrical energy supply that supplies the second electronic control with electrical energy.

7. The electronically controlled pneumatic operating brake system according to claim 6 , wherein the second electronic control provides redundancy for the first electronic control when the first electronic control or the first electrical energy supply of the first electronic control malfunctions or fails and the at least one first brake pressure is generated as a function of the first pneumatic control pressure (SD) and the at least one second brake pressure is generated as a function of the second pneumatic control (SD).

8. The electronically controlled pneumatic operating brake system according to claim 5 , wherein the magnet valve device is supplied with compressed air by the supply connection and includes an inlet/-outlet magnet valve combination configured to increase, maintain or decrease the first pneumatic control pressure (SD) and the second pneumatic control pressure (SD) as a function of the third electrical control signal.

9. The electronically controlled pneumatic operating brake system according to claim 5 ,
wherein the signal generation devices include at least one pressure sensor that transmits the first pneumatic control pressure (SD) put out by the magnet valve device or an actual pressure value corresponding to the second pneumatic control pressure (SD) to the second electronic control, and
wherein the second electronic control controls the magnet valve device in a closed control loop so that the actual pressure value is regulated to match a nominal pressure value which is a fun

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh
• Knorr Bremse Systeme For Nutzfahrzeuge Gmbh

Inventors

• Hecker Falk
• Jundt Oliver
• Roether Friedbert

Classifications

• B60T2270/402

  Back-up · CPC title

• B60T15/027

  in pneumatic systems · CPC title

• B60T8/1708

  for lorries or tractor-trailer combinations · CPC title

• B60T15/18

  Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere · CPC title

• B60T15/36

  Other control devices or valves characterised by definite functions {(electrically controlled valves in fluid-pressure brake systems B60T15/027, B60T15/028)} · CPC title