Granted Patent B2

US 12,539,836 · App. 18/328,060 · Granted Feb 3, 2026

Inventors: Thilo Klostermann (Barsinghausen, DE); Florian Schwagmeyer (Uetze-Dollbergen, DE)

Assignee: ZF CV Systems Europe BV

B60T13/36B60T8/1708B60T8/3605B60T13/683

Abstract

Claims (15)

1 . A compressed-air braking system of a tractor vehicle having a plurality of vehicle axles, the compressed-air braking system comprising:

two service-brake circuits each having a compressed-air accumulator, a supply line routed from the compressed-air accumulator to a foot-brake valve, and an axle-brake line routed from said foot-brake valve to wheel-brake lines and wheel-brake cylinders of corresponding ones of the plurality of vehicle axles connected to said wheel-brake lines; a parking-brake circuit having a third compressed-air accumulator, a supply line routed from said third compressed-air accumulator to a parking-brake valve, and an axle-brake line leading from said parking-brake valve to further wheel-brake lines and spring-brake cylinders of a corresponding one of the plurality of vehicle axles that are connected to said further wheel-brake lines;

a trailer control valve having at least one direct control input and an inverted control input;

a brake control line connected to said axle-brake line of one of said two service-brake circuits being connected to said at least one direct control input;

a further brake control line connected to said axle-brake line of said parking-brake circuit being connected to said inverted control input;

a valve device for controlling braking of a coupled trailer vehicle independently of the foot-brake valve;

said valve device having an electronically controllable valve unit;

said electronically controllable valve unit being arranged in said further brake control line connected to said inverted control input of said trailer control valve;

said valve unit having a valve-unit input, wherein a first portion of said further brake control line on a parking-brake valve side is connected to said valve-unit input;

said valve unit having a valve-unit output, wherein a second portion of said further brake control line on a trailer control-valve side is connected to said valve-unit output;

said valve unit having a depressurizing output; and,

said second portion of said further brake control line on the trailer control-valve side can be connected, via said valve unit, alternately to said first portion on the parking-brake valve side or to said depressurizing output.

2 . The compressed-air braking system of claim 1 , wherein said valve unit has an inlet valve and an outlet valve; said inlet valve is a 2/2-way solenoid valve and is arranged between said valve-unit input and said valve-unit output; said outlet valve is a 2/2-way solenoid valve and is arranged between said output and said depressurizing output; said valve-unit input is connected to said valve-unit output when said inlet valve is in a de-energized state and is shut off when said inlet valve is in an energized state; and, said depressurizing output is shut off when said outlet valve is in said de-energized state, and is connected to said valve-unit output when said outlet valve is in said energized state.

3 . The compressed-air braking system of claim 1 , wherein said valve unit is a 3/2-way solenoid valve including said valve-unit input, said valve-unit output, and said depressurizing output; said valve-unit input is connected to said valve-unit output when said 3/2 solenoid valve is in said de-energized state, and is shut off in said energized state; and, said depressurizing output is shut off when said 3/2 solenoid valve is in said de-energized state, and is connected to said valve-unit output in said energized state.

4 . The compressed-air braking system of claim 1 , wherein said valve unit is structurally equivalent to an ABS valve unit arranged in at least one wheel-brake line of one of the plurality of vehicle axles.

Assignments (2)

Priority Claims (1)

Continuity (2)

References Cited (23)