US 12,214,761 B2
Electropneumatic parking-brake valve unit
Fabian Schuppert, Wunstorf (DE); Rudolf Dückmann, Isernhagen (DE); and Hauke Kraus, Seelze (DE)
Assigned to ZF CV Systems Europe BV, Brussels (BE)
Filed by ZF CV Systems Europe BV, Brussels (BE)
Filed on Mar. 14, 2022, as Appl. No. 17/694,246.
Application 17/694,246 is a continuation of application No. PCT/EP2020/074281, filed on Sep. 1, 2020.
Claims priority of application No. 10 2019 125 747.6 (DE), filed on Sep. 25, 2019.
Prior Publication US 2022/0194340 A1, Jun. 23, 2022
Int. Cl. B60T 13/38 (2006.01); B60T 13/68 (2006.01); B60T 17/00 (2006.01); B60T 17/08 (2006.01); G05D 16/20 (2006.01)
CPC B60T 13/385 (2013.01) [B60T 13/683 (2013.01); B60T 17/002 (2013.01); B60T 17/085 (2013.01); G05D 16/2093 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electropneumatic parking-brake valve unit for an electronically controlled pneumatic brake system of a vehicle including a utility vehicle, the electropneumatic parking-brake valve unit comprising:
at least a first supply connection for receiving supply pressure (pV) from a compressed air source;
at least one spring brake connection for connecting to at least one spring brake cylinder of the vehicle;
a parking-brake valve arrangement having at least a first bistable valve switchable between first and second switching states wherein a spring brake pressure (pF) can be controllable in dependence upon the switching state of said first bistable valve;
a pneumatically switchable holding valve having a holding-valve connection whereat a first control pressure (p1) is provided and said pneumatically switchable holding valve being connected between said first supply connection and said first bistable valve;
a deaerator;
said pneumatically switchable holding valve being pretensioned under a spring load into a first switching position wherein said first bistable valve is connected to said deaerator;
said first bistable valve being configured to switch into a second switching position when said first control pressure (p1) at said holding-valve connection exceeds a predetermined first threshold value;
wherein said first bistable valve is connected to said first supply connection to receive said supply pressure (pV) in response to being switched into said second switching position; and,
wherein said first control pressure (p1) is controlled by an electrically switchable control valve which is part of the electropneumatic parking-brake valve unit or is arranged remotely therefrom.