It is important to estimate friction force characteristics between tire and road in order to improve the control performance of a vehicle in critical motions. An estimation method which estimates parameters concerned with friction force margin is proposed by applying the on-line least squares method to wheel rotational velocities. The effect of the estimation is evaluated by applying the method to the braking control. Friction force characteristics between tire and road is estimated using wheel velocity. The parameter concerned with friction force margin is estimated by the method. The method brings high performance vehicle control which cannot be achieved by the robust control approach. The slope of friction force against slip velocity at the operational point, or XBS (Extended Braking Stiffness), is an important parameter of tire/road friction characteristics. Maximum braking ?force can be obtained at the point XBS=0, and a decrease in XBS indicates a decrease in the margin of friction force.The XBS servo control was demonstrated which obtains a constant deceleration braking rate, as compared with conventional ABS. In the future, it is expected that XBS can be applied for brake control systems, e.g. Electro Hydraulic Brake to greatly enhance vehicle control performance.
Estimation of automotive tire force characteristics using wheel velocity
Schätzung der Autoreifen-Kraftkennlinie über die Fahrgeschwindigkeit
2002
6 Seiten, 13 Bilder, 10 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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