Patent ID: 6776461
Filing Date: 2004-08-17
Classification: B60T

Abstract:
A brake pressure regulating device for commercial vehicles, comprising:an operating brake valve for presetting a brake pressure, the operating brake valve having an electric outlet and a pneumatic outlet; at least one of a ventilation and bleed valve electrically triggerable by the operating brake valve to either pressurize or bleed a brake cylinder; a control valve, coupled between the pneumatic outlet and the brake cylinder, said control valve locking the pneumatic outlet against the brake cylinder during electronic brake pressure control, said control valve also triggering electronics during a failure; wherein said control valve comprises: a switching piston pressurized by a brake cylinder pressure (BZ) and an operating brake valve pressure (BBV); a pressure selection device, the pressure selection device including a high-pressure outlet and a low-pressure outlet to which a higher or lower of the brake cylinder pressure (BZ) and the operating brake valve pressure (BBV) are applied; wherein a first switching piston side is pressurized precisely by pressure from one of the high pressure outlet and the low pressure outlet, and a second piston side is pressurized on a partial surface with the brake operating valve pressure (BBV) and, on another partial surface, with the brake cylinder pressure (BZ).