Patent ID: 11970146
Assignee: ZF CV SYSTEMS EUROPE BV
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 10:
11. A method for controlling an electronically controllable secondary brake system (46, 46′), operated by pressure medium, of a vehicle (2), which secondary brake system (46, 46′) is usable both as a parking brake system and as an auxiliary brake system, the secondary brake system (46, 46′) comprising spring brake cylinders (68a, 68b) arranged on wheel brakes of at least one vehicle axle (8), a directly or indirectly electronically controllable brake control valve (56, 56′), and an electronic brake control unit (48) with a data storage medium (49), the method comprising:
reducing a brake force on the spring brake cylinders (68a, 68b) via a feed of pressure medium by way of the brake control valve (56, 56′);
increasing a brake force on the spring brake cylinders (68a, 68b) via a discharge of pressure medium by way of the brake control valve (56, 56′);
wherein the electronic brake control unit (48) controls the brake control valve (56, 56′) in a manner dependent on a current value of a brake value signal (SBW),
setting a working pressure (pFSB) in the spring brake cylinders (68a, 68b) in a manner dependent on the current value of the brake value signal (SBW) with an actuation of the brake control valve (56, 56′) and of a controllable check valve (62) that is arranged downstream of said brake control valve (56, 56′) and shuts off in the direction of the brake control valve (56, 56′);
lowering the working pressure (pFSB) along with an increasing value of the brake value signal (SBW).