Fluid-pressure and analogous brake systems – Multiple control – Fluid and electric
Patent
1990-03-06
1991-04-02
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple control
Fluid and electric
303 92, 303100, 303111, 303118, 303119, 303DIG4, B60T 888, B60T 832
Patent
active
050042998
ABSTRACT:
A vehicle dual wheel braking system of the type in which a respective electronically controlled pressure adjustment channel is provided for each of the wheels at the opposite ends of an axle of the vehicle for setting the braking pressures individually for each wheel in dependence upon a common electrical signal representative of the braking demand level set by a driver of the vehicle, each channel comprising a pressure control loop containing a pressure controller, a pressure control valve which adjusts the supply of fluid from a reservoir to the brake actuators for applying and releasing the brakes by solenoid control of the inlet and exhaust functions of the pressure control valve, and a feedback transducer which supplies a signal representative of the pressure in the pressure control valve. The system includes respective fault monitoring device for detecting the presence of faults in the signals provided by the two feedback transducers, and a device responsive to the fault monitoring device such that if a feedback signal fault is detected in one of the two channels, the individual pressure control on that channel is disabled and the solenoids controlling inlet and exhaust functions of the pressure control valve of that channel are energized from an alternative mechanism of control which does not rely upon the output signal from the faulty feedback transducer.
REFERENCES:
patent: 4175795 (1979-11-01), Mortimer et al.
patent: 4708225 (1987-11-01), Feldman et al.
patent: 4712839 (1987-12-01), Brearley et al.
patent: 4743072 (1988-05-01), Brearley
patent: 4784444 (1988-11-01), McCann et al.
patent: 4795219 (1989-01-01), Brearly et al.
patent: 4861115 (1989-08-01), Petersen
patent: 4933854 (1990-06-01), Miyake
Brearley Malcolm
Moseley Richard B.
Butler Douglas C.
Lucas Industries Public Limited Company
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