Control valve, electronically controllable braking system, and method for controlling the electronically controllable braking system

Patent metadata

Field	Value
Publication number	US-11565675-B2
Application number	US-201917050687-A
Country	US
Kind code	B2
Filing date	Mar 29, 2019
Priority date	Apr 26, 2018
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A control valve (12) for applying a spring-loaded brake pressure (p3b) to spring-loaded parts of a rear-axle wheel brake is provided. The control valve (12) is activatable pneumatically via a second control input (12b) with a parking-brake control pressure (p5). The parking-brake control pressure (p5) can act in such a manner on a control mechanism (14b, 15b, 17c, 22, 23, 24) arranged in a valve housing (12f) of the control valve (12) that a spring-loaded brake pressure (p3b) arises at a control output (12c) of the control valve (12) as a function of the parking-brake control pressure (p5) for bringing about a parking-brake braking specification with the spring-loaded parts of the rear-axle wheel brakes. The control valve (12) has a first control connection (12a) connectable to an adjustable first control chamber (14a), which is operatively connected to the control mechanism (14b, 15b, 17c, 22, 23, 24).

First claim

The invention claimed is:

1. A control valve ( 12 ) for applying a spring-loaded brake pressure (p 3 b ) to spring-loaded parts ( 3 b ) of a rear-axle wheel brake ( 3 ), wherein the control valve ( 12 ) is activatable pneumatically via a second control input ( 12 b ) with a parking-brake control pressure (p 5 ), wherein the parking-brake control pressure (p 5 ) can act in such a manner on a control mechanism ( 14 b , 15 b , 17 c , 22 , 23 , 24 ) arranged in a valve housing ( 12 f ) of the control valve ( 12 ) that a spring-loaded brake pressure (p 3 b ) arises ata control output ( 12 c ) of the control valve ( 12 ) as a function of the parking-brake control pressure (p 5 ) for bringing about a parking-brake braking specification (VP) with the spring-loaded parts ( 3 b ) of the rear-axle wheel brakes ( 3 )
wherein the control valve ( 12 ) includes a first control connection ( 12 a ) for activating the control valve ( 12 ) with a service-brake control pressure (pV; pR) which is dependent on a service-brake braking specification (VB),
wherein the first control connection ( 12 a ) is connectable to an adjustable first control chamber ( 14 a ),
wherein the first control chamber ( 14 a ) is operatively connected to the control mechanism ( 14 b , 15 b , 17 c , 22 , 23 , 24 ) arranged in the control valve ( 12 ) such that, during an adjustment of the first control chamber ( 14 a ) as a result of pressurization with the service-brake control pressure (pV; pR), the spring-loaded brake pressure (p 3 b ) at the control output ( 12 c ) is set as a function of the service-brake control pressure (pV; pR), the parking-brake control pressure (p 5 ), or a combination of the brake control pressure (pV; pR) and the parking-brake control pressure (p 5 );
wherein the control valve ( 12 ) includes a control device ( 20 ), wherein the control device ( 20 ) switches over a third control piston ( 15 c ) such that the first control connection ( 12 a ) is connected to the adjustable first control chamber ( 14 a ) via a connecting channel ( 19 ) for guiding the service-brake control pressure (pV; pR) into the first control chamber ( 14 a ), or that the atmosphere (A) is connected to the first control chamber ( 14 a ) for venting the first control chamber ( 14 a ).

2. The control valve ( 12 ) as claimed in claim 1 , wherein the control mechanism comprises an adjustable second control chamber ( 14 b ) and an adjustable second control piston ( 15 b ), wherein the parking-brake control pressure (p 5 ) is admitted into the second control chamber ( 14 b ) via the second control input ( 12 b ) and the second control piston ( 15 b ) is adjustable in a first direction (R 1 ) or a second direction (R 2 ) opposed to the first direction (R 1 ) by action of the parking-brake control pressure (p 5 ) on the second control piston ( 15 b ).

3. The control valve ( 12 ) as claimed in claim 2 , wherein the second control chamber ( 14 b ) is bounded by a third wall ( 17 c ) arranged on the adjustable second control piston ( 15 b ), wherein the third wall ( 17 c ) is movable in relation to the valve housing ( 12 f ) such that the second control piston ( 15 b ) is adjusted by action of the parking-brake control pressure (p 5 ) on the third wall ( 17 c ).

4. A control valve ( 12 ) for applying a spring-loaded brake pressure (p 3 b ) to spring-loaded parts ( 3 b ) of a rear-axle wheel brake ( 3 ), wherein the control valve ( 12 ) is activatable pneumatically via a second control input ( 12 b ) with a parking-brake control pressure (p 5 ), wherein the parking-brake control pressure (p 5 ) can act in such a manner on a control mechanism ( 14 b , 15 b , 17 c , 22 , 23 , 24 ) arranged in a valve housing ( 12 f ) of the control valve ( 12 ) that a spring-loaded brake pressure (p 3 b ) arises at a control output ( 12 c ) of the control valve ( 12 ) as a function of the parking-brake control pressure (p 5 ) for bringing about a parking-brake braking specification (VP) with the spring-loaded parts ( 3 b ) of the rear-axle wheel brakes ( 3 )
wherein the control valve ( 12 ) includes a first control connection ( 12 a ) for activating the control valve ( 12 ) with a service-brake control pressure (pV; pR) which is dependent on a service-brake braking specification (VB),
wherein the first control connection ( 12 a ) is connectable to an adjustable first control chamber ( 14 a ),
wherein the first control chamber ( 14 a ) is operatively connected to the control mechanism ( 14 b , 15 b , 17 c , 22 , 23 , 24 ) arranged in the control valve ( 12 ) such that, during an adjustment of the first control chamber ( 14 a ) as a result of pressurization with the service-brake control pressure (pV; pR), the spring-loaded brake pressure (p 3 b ) at the control output ( 12 c ) is set as a function of the service-brake control pressure (pV; pR), the parking-brake control pressure (p 5 ), or a combination of the brake control pressure (pV; pR) and the parking-brake control pressure (p 5 );
wherein the control mechanism comprises an adjustable second control chamber ( 14 b ) and an adjustable second control piston ( 15 b ), wherein the parking-brake control pressure (p 5 ) is admitted into the second control chamber ( 14 b ) via the second control input ( 12 b ) and the second control piston ( 15 b ) is adjustable in a first direction (R 1 ) or a second direction (R 2 ) opposed to the first direction (R 1 ) by action of the parking-brake control pressure (p 5 ) on the second control piston ( 15 b );
wherein the first control chamber ( 14 a ) is operatively connected to a first control piston ( 15 a ), wherein the first control piston ( 15 a ) is operatively connected to the second control piston ( 15 b ) such that the second control piston ( 15 b ) is carried along by an adjustment of the first control piston ( 15 a ).

5. A control valve ( 12 ) for applying a spring-loaded brake pressure (p 3 b ) to spring-loaded parts ( 3 b ) of a rear-axle wheel brake ( 3 ), wherein the control valve ( 12 ) is activatable pneumatically via a second control input ( 12 b ) with a parking-brake control pressure (p 5 ), wherein the parking-brake control pressure (p 5 ) can act in such a manner on a control mechanism ( 14 b , 15 b , 17 c , 22 , 23 , 24 ) arranged in a valve housing ( 12 f ) of the control valve ( 12 ) that a spring-loaded brake pressure (p 3 b ) arises at a control output ( 12 c ) of the control valve ( 12 ) as a function of the parking-brake control pressure (p 5 ) for bringing about a parking-brake braking specification (VP) with the spring-loaded parts ( 3 b ) of the rear-axle wheel brakes ( 3 )
wherein the control valve ( 12 ) includes a first control connection ( 12 a ) for activating the control valve ( 12 ) with a service-brake control pressure (pV; pR) which is dependent on a service-brake braking specification (VB),
wherein the first control connection ( 12 a ) is connectable to an adjustable first control chamber ( 14 a ),
wherein the first control chamber ( 14 a ) is operatively connected to the control mechanism ( 14 b , 15 b , 17 c , 22 , 23 , 24 ) arranged in the control valve ( 12 ) such that, during an adjustment of the first control chamber ( 14 a ) as a result of pressurization with the service-brake control pressure (pV; pR), the spring-loaded brake pressure (p 3 b ) at the control output ( 12 c ) is set as a function of the service-brake control pressure (pV; pR), the parking-brake control pressure (p 5 ), or a combination of the brake control pressure (pV; pR) and the parking-brake control pressure (p 5 );
wherein the control mechanism comprises an adjustable second control chamber (

Assignees

• Wabco Europe Bvba
• Zf Cv Systems Europe Bv

Inventors

• Beier Peter
• Otremba Robert
• Van Thiel Julian

Classifications

• B60T13/385

  Control arrangements therefor · CPC title

• B60T8/885

  using electrical circuitry · CPC title

• B60T2270/402

  Back-up · CPC title

• B60T15/22

  with one or more auxiliary valves, for braking, releasing, filling reservoirs · CPC title

• B60T8/17

  Using electrical or electronic regulation means to control braking {(detecting or indicating faulty operation B60T8/885)} · CPC title