Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1994-07-22
1995-11-21
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031171, 3031191, 3031192, B60T 832, B60T 848, B60T 850
Patent
active
054680590
ABSTRACT:
The invention is directed to a hydraulic, anti-skid braking system for a wheeled vehicle. A source of hydraulic or other operating fluid is applied to the brakes of the vehicle. A sensor indicates when the speed of wheel rotation exceeds a predetermined value. Responsive thereto, a modulator assembly modulates a supply of the operating fluid to the vehicle brakes. An electronic control unit controls the modulator assembly in order to isolate the source of operating fluid from the brakes and to relieve the pressure of the operating fluid applied to the brakes. At the termination of a sensor caused signal, there is a re-application of the operating fluid to the brakes at a controlled rate. The modulator assembly has a bore, a valve spool working in the bore, a first normally closed solenoid for operating a valve, a passage between first and second ends of the bore, and a second solenoid operated valve in the passage. The second solenoid operated valve, a passage between first and second ends of the bore, and a second solenoid operated valve in the passage. The second solenoid operated valve controls the re-application of fluid to the brake by establishing a pressure differential across the valve spool, and, in turn, to meter the applying of fluid to the brakes.
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Butler Douglas C.
Lucas Industries Public Limited Company
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