Anti-skid brake control system

Claim 1

Antiskid brake control system for a motor vehicle having wheels, said wheels during braking exhibiting slippage characterized by a μ-slippage curve having a stable portion, an unstable portion, and a limit therebetween, said system comprising means for determining the deceleration V R of a wheel, means for determining the deceleration V F of the vehicle, means for determining the difference D=V F -V R , brake pressure control means which receives brake pressure control signals for increasing brake pressure, maintaining brake pressure constant, and reducing brake pressure, a ladder filter which receives the difference D and uses the difference D to determine reflection coefficients during periods when brake pressure is maintained constant, and a control circuit which receives the difference D and uses the difference D to generate said brake pressure control signals for said brake pressure control means, said control circuit providing a signal to said ladder filter to cause determination of said reflection coefficients when said brake pressure is maintained constant, said control circuit receiving said reflection coefficients and generating control signals which effect a slippage on the stable portion of the μ-slippage curve and close to the limit from the distance of the highest reflection coefficient from a value of 1.