US 12,420,769 B2
Method for testing a select-high 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 Nov. 28, 2022, as Appl. No. 18/059,243.
Application 18/059,243 is a continuation of application No. PCT/EP2021/067859, filed on Jun. 29, 2021.
Claims priority of application No. 10 2020 117 324.5 (DE), filed on Jul. 1, 2020.
Prior Publication US 2023/0089211 A1, Mar. 23, 2023
Int. Cl. B60T 17/22 (2006.01); B60T 13/26 (2006.01); B60T 13/68 (2006.01)
CPC B60T 17/221 (2013.01) [B60T 13/26 (2013.01); B60T 13/683 (2013.01); B60T 2270/88 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A method for testing a shuttle valve in a pneumatic system, wherein the shuttle valve has a first shuttle valve port, a second shuttle valve port, and a third shuttle valve port, wherein a higher one of pressures prevailing at the first shuttle valve port and second shuttle valve port is modulated at the third shuttle valve port, the method comprising:
modulating a first pressure at the first shuttle valve port;
ascertaining a first value indicative of the first pressure at the first shuttle valve port;
comparing the first value indicative of the first pressure with a first predetermined comparison value, and, in the event of a deviation greater than a first tolerance: at least one of ascertaining and outputting a fault of the shuttle valve;
after the first shuttle valve port has been tested, ventilating said first shuttle valve port to ambient pressure;
thereafter, modulating a second pressure at the second shuttle valve port;
ascertaining a second value indicative of the second pressure at the second shuttle valve port;
comparing the second value indicative of the second pressure with a second predetermined comparison value, and,
in the event of a deviation greater than a second tolerance: at least one of ascertaining and outputting the fault of the shuttle valve.