Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1995-12-28
1998-07-14
Poon, Peter M.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
303 15, 303 20, B60T 1300
Patent
active
057793247
ABSTRACT:
A hydraulic control system configured for use with a towed vehicle hydraulic brake system controls the pressure of the hydraulic fluid provided to the brake as a function of an operator-selected input. A hydraulic pressure control manifold is coupled between a pump and the towed vehicle brake and controls the pressure of the hydraulic fluid supplied to the brake with a plurality of pressure relief check valves interconnected in a parallel hydraulic circuit between the pump and the brake. A plurality of on-off valves are connected in a series hydraulic circuit with the check valves. The pressure relief levels of the check valves correspond to a plurality of towed vehicle braking forces. An operator of a towing vehicle chooses a desired one of the plurality of braking forces through a selector switch. When a desired braking force is chosen, appropriate on-off valves in the hydraulic pressure control manifold are closed or opened, thereby enabling or disabling appropriate check valves and controlling the pressure of the hydraulic fluid supplied to the brake and the corresponding towed vehicle braking force.
REFERENCES:
patent: 3948569 (1976-04-01), Gentet et al.
patent: 4054325 (1977-10-01), Popp
patent: 5346289 (1994-09-01), Cords et al.
patent: 5368372 (1994-11-01), Cords et al.
Cords Frederick W.
Frye David E.
Swanson Jeffrey S.
Commercial Intertech Corp.
Poon Peter M.
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