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US 5,044,697 AGranted
Brake valve control system
AssigneeCrane Co.
InventorsDouglas M. Longyear, Stanley R. Bluhm
Life of this patent
Estimating the term…
Abstract
The brake valve control system for an aircraft wheel bracking system includes primary and backup brake valve control subsystems and isolates and switches between subsystems. Certain portions of the entire braking system are shared, and those portions which are not shared are isolated but interconnected for switching from a primary brake control mode to a backup subsystem upon failure of the primary subsystem. A unique metering spool valve, and the linking of metering spool valves and servocontrol valves with either a tandem selector valve or interlinked primary and secondary selector valves allows for significant reduction in weight and complexity for the backup or override system.
Claims13
A brake valve control system for use in a wheel braking system including brake actuator means said brake valve control system comprising:
- a) a primary brake valve control subsystem for controlling said brake actuator means having a primary source of brake pressure in fluid communication with said brake actuator means, said primary brake valve control subsystem including at least one primary control valve having an inlet in fluid communication with said primary source of brake pressure and an outlet in fluid communication with said brake actuator means;
- b) a secondary brake valve control subsystem for controlling said brake actuator means in the event of failure of said primary brake valve control subsystem, said secondary brake valve control subsystem having a secondary source of brake pressure in fluid communication with said brake actuator means, said secondary brake valve control subsystem including at least one secondary control valve having an inlet in fluid communication with said secondary source of brake pressure and an outlet in fluid communication with said brake actuator means;
- c) subsystem selector means in fluid communication with said primary and secondary brake valve control subsystems operative to select either said primary or secondary brake valve control subsystems to actively control said brake actuator means and to simultaneously render the non-selected brake valve control subsystem inactive, whereby said subsystem selector means is operative to override any failure in either the primary or secondary brake valve control subsystem, each said control valve including a housing, a metering spool in said housing controlling fluid communication between said sources of brake pressure with said brake actuator means, and means for deactivating said control valves, comprising a slidable stop member movable between an open position and a closed position for closing communication between said sources of brake pressure and said brake actuator means in response to fluid pressure from said subsystem selector means.
A brake valve control system for use in an aircraft wheel braking system having brake actuator means, comprising:
- a primary brake valve control subsystem for controlling said brake actuator means, having a primary source of brake pressure in fluid communication with said brake actuator means;
- at least one primary control valve including a housing, a metering spool in said housing controlling fluid communication between said primary source of brake pressure with said brake actuating means, and a slidable stop member movable between an open position and a closed position for closing communication between said primary source of brake pressure and said brake actuator means in response to fluid pressure from said subsystem selector means, said primary control valve having an inlet in fluid communication with said primary source of brake pressure and an outlet in fluid communication with said brake actuator means;
- primary valve selector means having an outlet in fluid communication with said primary control valve slidable stop member, and an inlet in fluid communication with a primary brake pressure return line, said primary valve selector means being operative in a first normally actuated position to open fluid communication between said primary return line and said primary control valve slidable stop member, and operative in a second, unactuated position, to allow fluid communication between said primary pressure line and said primary control valve slidable stop member;
- a secondary brake valve control subsystem for controlling said brake actuator means, having a secondary source of brake pressure in fluid communication with said brake actuator means;
- at least one secondary control valve including a housing, a metering spool in said housing controlling fluid communication between said secondary source of brake pressure with said brake actuator means, and a slidable stop member movable between an open position and a closed position for closing communication between said secondary source of brake pressure and said brake actuator means in response to fluid pressure from said subsystem selector means, said secondary control valve having an inlet in fluid communication with said secondary source of brake pressure and an outlet in fluid communication with said brake actuator means;
- secondary valve selector means having an outlet in fluid communication with said secondary control valve slidable stop member, a first inlet in fluid communication with said secondary source of brake pressure and operative in a first position to open fluid communication between said secondary source of brake pressure and said secondary control valve slidable stop means, and operative in a second position to block communication between said secondary source of brake pressure and said secondary control valve slidable stop means;
- said secondary valve selector means having a second inlet in fluid communication with said primary valve selector means outlet and operative to move said secondary valve selector means to said second position in response to pressure from said primary valve selector means outlet;
- said secondary valve selector means having a third inlet in fluid communication with said primary return line and operative to move said secondary valve selector to said first position in response to pressure from said primary return line;
- whereby when said primary valve selector means is in an unactuated position, said primary control valve is closed to fluid communication with said brake actuator means, and said secondary control valve is open to fluid communication with said brake actuator means.
6 more elements
Dependencies are inferred from the claim text.