Antilock braking system adaptation to state of road surface - involves evaluation of phase difference between peaks of wheel-slip and deceleration as criterion for relaxation of antilock threshold

摘要

The curve of vehicular deceleration (aFZ) plotted against time has a waveform exhibiting a slight delay (delta T) in peaking w.r.t. the corresp. average wheel-slip curve (SFZ). The two curves are compared and the thresholds of antilock braking operation are varied in accordance with the delay. Electronic digital signal processing evaluates the delay w.r.t. a reference speed and recognises presence or absence of a peak in the frictional coefft./slip curve. Where no peak is found, the max. permissible wheel-slip is increased. ADVANTAGE - Braking power is increased where the frictional coefft./slip curve rises continuously without a pronounced max..