US 12,441,287 B2
Brake system for a utility vehicle, and method for testing the functionality of a select-high valve of the brake system
Oliver Jundt, Hessigheim (DE); Max Michalski, Neubiberg (DE); and Falk Hecker, Markgroeningen (DE)
Assigned to KNORR-BREMSE SYSTEME FUER NUTZFAHRZEUGE GMBH, Munich (DE)
Appl. No. 18/564,377
Filed by Knorr-Bremse Systeme Fuer Nutzfahrzeuge GmbH, Munich (DE)
PCT Filed Jun. 10, 2022, PCT No. PCT/EP2022/065883
§ 371(c)(1), (2) Date Nov. 27, 2023,
PCT Pub. No. WO2023/274693, PCT Pub. Date Jan. 5, 2023.
Claims priority of application No. 10 2021 206 902.9 (DE), filed on Jun. 30, 2021.
Prior Publication US 2024/0375633 A1, Nov. 14, 2024
Int. Cl. B60T 17/22 (2006.01); B60T 13/26 (2006.01); B60T 13/68 (2006.01)
CPC B60T 17/22 (2013.01) [B60T 13/268 (2013.01); B60T 13/683 (2013.01); B60T 2270/402 (2013.01); B60T 2270/406 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for testing a functionality of a select-high valve of a brake system, the method comprising:
first detecting a pressure in a main supply circuit by a first pressure detection device and first detecting a pressure in a service brake circuit by a second pressure detection device;
first comparing a pressure in the main supply circuit with the pressure in the service brake circuit, and first ascertaining that the service brake circuit is being supplied with pressure from an other supply circuit if the detected pressure in the service brake circuit is higher than the detected pressure in the main supply circuit;
increasing the pressure in the main supply circuit above a specified maximum pressure of the other supply circuit by a pressure source;
second detecting the pressure in the main supply circuit by the first pressure detection device and second detecting the pressure in the service brake circuit by the second pressure detection device;
second comparing the pressure in the main supply circuit with the pressure in the service brake circuit, and second ascertaining that the service brake circuit is being supplied with pressure from the main supply circuit if the detected pressure in the service brake circuit is at least approximately equal to the detected pressure in the main supply circuit; and
third ascertaining that the functionality of the select-high valve is present if the first ascertainment ascertains that the service brake circuit is supplied with pressure from the other supply circuit and the second ascertainment ascertains that the service brake circuit is supplied with pressure from the main supply circuit.