Airplane brake control

Claim 1

IN A BRAKING SYSTEM FOR A WHEELED VEHICLE HAVING A PRESSURE-OPERATED BRAKE, THE COMBINATION OF PRESSURE SUPPLY MEANS, A NORMALLY CLOSED BYPASS VALVE CONNECTED THERETO, SAID VALVE HAVING PARTS MOVABLE RELATIVELY TO ONE ANOTHER TO A RELATIVE POSITION IN WHICH SAID VALVE OPENS TO REDUCE THE BRAKE PRESSURE, ELECTRICAL VALVE ACTUATING MEANS FOR MOVING SAID VALVE PARTS RELATIVELY TO ONE ANOTHER TO SAID POSITION IN RESPONSE TO A PREDETERMINED DIFFERENCE BETWEEN LINEAR AND ANGULAR ACCELERATIONS OF A VEHICLE WHEEL, ACCELEROMETER MEANS FOR PRODUCING ELECTRICAL OUTPUTS PROPORTIONAL RESPECTIVELY TO SAID LINEAR AND ANGULAR ACCELERATIONS AND COMPRISING THREE ACCELEROMETERS, ONE OF SAID ACCELEROMETERS BEING RESPONSIVE TO LINEAR ACCELERATION AND PRODUCING SAID OUTPUT PROPORTIONAL TO LINEAR ACCELERATION, THE OTHER TWO ACCELEROMETERS BEING RESPONSIVE TO BOTH LINEAR AND ANGULAR ACCELERATIONS AND BEING CONNECTED TO CANCEL LINEAR ACCELERATION EFFECTS AND TO PRODUCE SAID OUTPUT PROPORTIONAL TO ANGULAR ACCELERATION, SAID VALVE ACTUATING MEANS BEING ENERGIZED BY SAID OUTPUTS TO MOVE SAID VALVE PARTS TO SAID OPEN POSITION WHEN THE DIFFERENCE BETWEEN SAID OUTPUTS REACHES A PREDETERMNED VALUE AND INCREASE OF SAID DIFFERENCE ABOVE SAID PREDETERMINED VALUE CAUSING A CORRESPONDING INCREASE IN VALVE PORT OPENING AND REDUCTION OF BRAKE TORQUE TO LIMIT SLIPPAGE AND RETURN SAID VALVE PARTS TOWARD CLOSED POSITION.