Antiskid control system for brakes which exhibit large changes in lining friction coefficient
AssigneeGoodyear Aerospace Corporation
InventorArnold A. Beck
Life of this patent
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Abstract
An antiskid control system is presented which includes variable gains to compensate for brakes which exhibit large changes in lining friction coefficient. Fundamentally, the invention includes a pressure transducer and associated amplifier which presents an output signal corresponding to brake pressure. An accelerometer is connected to a second amplifier which presents an output signal analogous to brake torque. These two signals are combined in a summing circuit and the function obtained therefrom is used to modify the control signal from the antiskid control circuit. Effectively, this function provides a modification of antiskid system gain.
Claims11
In an antiskid control system for a braked wheel vehicle wherein the system includes a brake on a wheel, a control valve regulating pressure at the brake, and a control circuit connected to the control valve and applying thereto an antiskid control signal, the improvement, comprising:
- first means comprising a first amplifer having variable gain, said first means being connected to the brake for producing an output signal corresponding to the brake pressure at the brake;
- second means connected to the vehicle for producing an output signal analogous to the torque of the brake;
- summing means interconnected between said first and second means for receiving and summing said output signals therefrom;
- and
- modification means for receiving both the antiskid control signal and the sum of said output signals from said summing means, said modification means modifying the antiskid control signal as a function of said sum and then supplying the modified antiskid control signal to the control valve.
Apparatus for modifying the brake control signal from an antiskid control circuit and for applying such modified signal to a brake valve, comprising:
- a first amplifier presenting an output signal corresponding to brake pressure;
- a second amplifier presenting an output signal analogous to brake torque;
- means operatively interconnected between said first and second amplifiers for modifying the brake control signal as a function of said outputs of said first and second amplifiers;
- and
- wherein said first and second amplifiers each include a gain network having a zener diode in series connection with a resistor.
Dependencies are inferred from the claim text.