Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1990-03-08
1991-08-27
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
303 14, 303 15, 303 28, 303 29, 303DIG3, B60T 1300
Patent
active
050428837
ABSTRACT:
A trailer braking system for a towing vehicle has a trailer braking valve (26) is fed with a pressurized air supply which is modulated by the opening of the valve, as controlled by a first control pressure regulated by a trailer braking controller (24) in accordance with braking demand signals, to produce a trailer braking pressure. In order that a trailer braking pressure may be generated even if the above trailer braking valve control fails, the valve is supplied with a second control pressure independently of the first, and which is also capable of operating the trailer braking valve (26). In a preferred embodiment, the second control pressure is supplied from a braking line of the towing vehicle, such that the "back up" control pressure is a function of the towing vehicle braking.
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Brearley Malcolm
Hurst David C.
McCann Denis J.
Butler Douglas C.
Lucas Industries Public Limited Company
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