| 摘要 |
A sensor (12, 13) in the drawbar (3) (or fifth-wheel coupling) of a tractor-trailer road vehicle combination (1, 2) senses both push and pull force in a linear proportional manner and produces an electrical signal which is used to act on a continuously proportional solenoid valve (8) in the fluid pressure supply to the trailer brakes to control the trailer braking continuously, during application, in a sense tending to reduce the force in the drawbar (3) to zero. There may be a base pressure applied to the trailer brakes, modified positively or negatively by the pressure from the sensor signal.
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