| 摘要 |
The invention relates to a parking brake system for a utility vehicle that can be pneumatically coupled to a trailer. Said parking brake system comprises a control unit (10) having control electronics (12), two valve devices (14, 16, 18), a compressed-air inlet (20) that can be coupled to a compressed-air source, two compressed-air working outlets (22, 24) and a deaeration outlet (26). A relay valve (28) receives a control pressure made available by a first valve device (14) of the control unit and aerates or deaerates at least one spring brake cylinder (30) depending on the control pressure. A trailer brake system can be aerated or deaerated depending on the control pressure made available by the second valve device (16) and detectable by a pressure sensor (32), said second valve device (16) being coupled in a first switching state to the compressed-air inlet (20) of the control unit (10) without the intermediate connection of the relay valve (28). The invention is characterized in that the second valve device (16), in a second switching state, is coupled to the deaeration outlet (26) of the control unit without the intermediate connection of the relay valve (28). The invention also relates to a method for controlling and/or regulating the operation of a parking brake system. |
