Antiskid control system for brakes which exhibit large changes in lining friction coefficient
First Claim
1. 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.
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Accused Products
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.
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Citations
11 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for modifying the brake control signal from an antiskid control circuit and for applying such modified signal to a brake valve, comprising:
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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. - View Dependent Claims (8, 9, 10, 11)
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Specification