Brake system for a utility vehicle, utility vehicle, and method for operating the brake system

Patent metadata

Field	Value
Publication number	US-12515634-B2
Application number	US-202217839632-A
Country	US
Kind code	B2
Filing date	Jun 14, 2022
Priority date	Jun 17, 2021
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

A brake system for a utility vehicle includes: an electronic brake controller unit, a pneumatic parking brake circuit with at least one spring energy cylinder, a parking brake valve to control a parking brake pressure in the parking brake circuit, and at least one 3/3-way valve arranged in a pneumatic line of the parking brake circuit between the parking brake valve and at least one of the spring energy cylinders. The 3/3-way valve is actuable by the electronic brake control unit, and is configured to ventilate the pneumatic line between the 3/3-way valve and at least one of the spring energy cylinders to a predefined pressure, so as to cause the at least one of the spring energy cylinders to allow a brake, which is assigned to the spring energy cylinder, to pass into engagement.

First claim

What is claimed is:

1 . A brake system for a utility vehicle, comprising:
an electronic brake controller unit; a pneumatic parking brake circuit, including:
at least one spring energy cylinder;
a parking brake valve to control a parking brake pressure in the parking brake circuit; and
at least one 3/3-way valve, which is arranged in a pneumatic line of the parking brake circuit, between the parking brake valve and at least one of the spring energy cylinders, wherein the 3/3-way valve is actuable by the electronic brake controller unit;
wherein the 3/3-way valve is configured to ventilate the pneumatic line between the 3/3-way valve and at least one of the spring energy cylinders to a predefined pressure, so as to cause the at least one of the spring energy cylinders to allow a brake, which is assigned to the spring energy cylinder, to pass into engagement; wherein the electronic control unit is configured to detect a failure of a function of a service brake circuit in the utility vehicle, and based on the detecting of the failure, actuate the at least one 3/3-way valve to ventilate the pneumatic line between the at least one 3/3-way valve and the spring energy cylinder to the predefined pressure, so as to allow the at least one brake which is assigned to the at least one spring energy cylinder to pass into engagement.

2 . The brake system of claim 1 , wherein the 3/3-way valve includes a pressure control valve.

3 . The brake system of claim 1 , wherein the 3/3-way valve is formed from two 2/2-way valves.

4 . The brake system of claim 1 , wherein the 3/3-way valve is configured to be actuable by the electronic brake control unit so that it acts as an ABS valve.

5 . The brake system of claim 1 , wherein the service brake circuit has at least one service brake cylinder, one of the at least one service brake cylinder being configured to allow the brake, which is assigned to the spring energy cylinder, to pass into engagement.

6 . The brake system of claim 5 , wherein the service brake cylinder and the spring energy cylinder are configured integrally as a combination brake cylinder.

7 . The brake system of claim 5 , wherein:
the parking brake circuit have two spring energy cylinders and a single 3/3-way valve, the brake system have at least two service brake circuits, one of the service brake circuits have two service brake cylinders, and the two service brake cylinders are configured to allow the brakes, which are assigned to the two spring energy cylinders, to pass into engagement, the 3/3-way valve are arranged in the pneumatic line between the parking brake valve and the two spring energy cylinders, and the 3/3-way valve are configured to cause the two spring energy cylinders to allow the brakes, which are assigned to the two spring energy cylinders, to pass into engagement.

8 . The brake system of claim 5 , wherein:
the parking brake circuit have two spring energy cylinders and two 3/3-way valves, the two 3/3-way valves are arranged in the pneumatic line between the parking brake valve and in each case one of the spring energy cylinders, the brake system have at least two service brake circuits, one of the service brake circuits have two service brake cylinders, the two service brake cylinders are configured to allow the brakes, which are assigned to the two spring energy cylinders, to pass into engagement, and the two 3/3-way valves are configured to cause the two spring energy cylinders in each case to allow the brake, which is assigned to the respective spring energy cylinder, to pass into engagement individually and independently of one another.

9 . The brake system of claim 5 , wherein:
the parking brake circuit have four spring energy cylinders and four 3/3-way valves, the four 3/3-way valves are arranged in the pneumatic line between the parking brake valve and in each case one of the spring energy cylinders, the brake system have at least two service brake circuits, two of the service brake circuits have in each case two service brake cylinders, the two service brake cylinders are configured to allow the brakes, which are assigned to the four spring energy cylinders, to pass into engagement, and the four 3/3-way valves are configured to cause the four spring energy cylinders in each case to allow the brake, which is assigned to the respective spring energy cylinder, to pass into engagement individually and independently of one another.

10 . The brake system of claim 1 , further comprising:
a trailer control valve to actuate pneumatic brakes of a trailer of the utility vehicle; and a further 3/3-way valve, which is arranged in a pneumatic line between a parking brake actuating element and the trailer control valve; wherein the further 3/3-way valve is actuable by the electronic brake control unit, and wherein the further 3/3-way valve is configured to ventilate the pneumatic line between the 3/3-way valve and the trailer control valve to a predefined pressure.

11 . The brake system as claimed in claim 10 , wherein the further 3/3-way valve includes a further pressure control valve.

12 . The brake system as claimed in claim 11 , wherein the further pressure control valve is configured to be actuable by the electronic brake controller unit so that it acts as an ABS valve.

13 . The brake system of claim 1 , wherein the brake system has an air preparation unit, and wherein control units of the electronic brake control unit for the 3/3-way valve are integrated into a control unit of the air preparation unit.

14 . The brake system of claim 1 , wherein the brake system has an electric parking brake, and wherein control elements of the electronic brake control unit for the 3/3-way valve are integrated into a controller unit of the electric parking brake.

15 . The brake system of claim 1 , further comprising:
a further controller unit, wherein control elements of the electronic brake controller unit for the 3/3-way valve are integrated into this further controller unit.

16 . A utility vehicle, comprising:
a brake system, including:
an electronic brake controller unit;
a pneumatic parking brake circuit, including:
at least one spring energy cylinder;
a parking brake valve to control a parking brake pressure in the parking brake circuit; and
at least one 3/3-way valve, which is arranged in a pneumatic line of the parking brake circuit, between the parking brake valve and at least one of the spring energy cylinders, wherein the 3/3-way valve is actuable by the electronic brake controller unit;

wherein the 3/3-way valve is configured to ventilate the pneumatic line between the 3/3-way valve and at least one of the spring energy cylinders to a predefined pressure, so as to cause the at least one of the spring energy cylinders to allow a brake, which is assigned to the spring energy cylinder, to pass into engagement;
wherein the electronic control unit is configured to detect a failure of a function of a service brake circuit in the utility vehicle, and based on the detecting of the failure, actuate the at least one 3/3-way valve to ventilate the pneumatic line between the at least one 3/3-way valve and the spring energy cylinder to the predefined pressure, so as to allow the at least one brake which is assigned to the at least one spring energy cylinder to pass into engagement.

17 . A method for operating a brake system of a utility vehicle, the method comprising:
releasing at least one brake, which is assigned to at least one spring energy cylinder by actuating a parking brake valve and increasin

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Hecker Falk
• Jundt Oliver
• Roether Friedbert
• Michalski Max
• Weinhold Thomas

Classifications

• B60T8/34

  having a fluid pressure regulator responsive to a speed condition · CPC title

• B60T8/94

  on a fluid pressure regulator · CPC title

• 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

• B60T13/683

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

• B60T13/662

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