| 摘要 |
<p>The invention relates to a brake control circuit (10, 110, 210). There is a need for a trailer brake control circuit (10, 110, 210) for a by-wire brake system. A brake control circuit (10, 110, 210) for trailer brakes (12, 112, 212, 213) in a by-wire brake system includes a hydraulic pump (14) or a supply of pressurized air (114, 214), a hydraulic reservoir (16) or an air vent (116), a pair of solenoid operated proportional valves (18, 20, 118, 120, 218, 220) for controlling communication between the pump (14, 114, 214), the reservoir (16, 116, 216) and the trailer brakes (12, 112, 212, 213), and a pair of solenoid operated shutoff valves (22, 24, 122, 124, 222, 224), each controlling communication between the trailer brakes (12, 112, 212, 213) and a corresponding one of the proportional valves (18, 20, 118, 120, 218, 220).
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