US 12,263,821 B2
Reliable parking brake valve unit with a bypass valve
Julian van Thiel, Grossburgwedel (DE)
Assigned to ZF CV Systems Global GmbH, Bern (CH)
Filed by ZF CV Systems Global GmbH, Bern (CH)
Filed on Feb. 27, 2024, as Appl. No. 18/589,106.
Application 18/589,106 is a continuation of application No. PCT/EP2022/073022, filed on Aug. 18, 2022.
Claims priority of application No. 10 2021 122 498.5 (DE), filed on Aug. 31, 2021.
Prior Publication US 2024/0198991 A1, Jun. 20, 2024
Int. Cl. B60T 13/68 (2006.01); B60T 8/171 (2006.01); B60T 13/26 (2006.01); B60T 13/38 (2006.01); B60T 13/58 (2006.01); B60T 17/22 (2006.01)
CPC B60T 13/683 (2013.01) [B60T 8/171 (2013.01); B60T 13/268 (2013.01); B60T 13/385 (2013.01); B60T 13/58 (2013.01); B60T 17/22 (2013.01); B60T 2270/402 (2013.01); B60T 2270/406 (2013.01); B60T 2270/413 (2013.01); B60T 2270/414 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electropneumatic parking brake device for supplying air to and exhausting air from at least one spring-loaded accumulator brake cylinder of an electronically controllable pneumatic braking system for a vehicle, the electropneumatic parking brake device comprising:
a parking brake valve unit having a reservoir port for receiving reservoir pressure from a parking brake reservoir, wherein said parking brake valve unit is configured to set a parking brake pressure at least at one spring-loaded accumulator port in dependence upon a parking brake signal;
a non-return valve arranged between said parking brake valve unit and the parking brake reservoir in order to prevent compressed air from flowing back from said parking brake valve unit to the parking brake reservoir; and,
a bypass valve configured to be switched to supply air to and exhaust air from said spring-loaded accumulator port, wherein said bypass valve is configured to be activated and switched independently of said parking brake valve unit.