Fluid-pressure and analogous brake systems – Speed-controlled – Specific mu determination
Reexamination Certificate
2005-12-06
2005-12-06
Butler, Douglas C. (Department: 3683)
Fluid-pressure and analogous brake systems
Speed-controlled
Specific mu determination
C180S197000, C303S020000, C701S090000
Reexamination Certificate
active
06971726
ABSTRACT:
A system is presented for controlling the stability of a vehicle. The system includes a controller using a slip parameter GOPTcorresponding to a predetermined value of the coefficient of friction μ or a controller maintaining the functioning of the tire at an optimal value δOPTof the drift angle corresponding to the maximum value of the draft thrust Ftarget. The controller performs the following operations (where X is either the slip G or the drift angle δ, and Y is either μ or F). Estimations or measurements are determined for at least one pair of values (Xi, Yi). The corresponding values of the slope αiare determined for the straight line passing through the origin (Xi, Yi). Coefficients Apare calculated by direct calculation or by a regression from a sufficient number of pairs with (αi, Xi) so as to model a variation curve αi=f(Xi, Ap). A target value XTargetis calculated by using a predetermined invariant “Invt”.
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Fangeat Nicolas
Levy Georges
Butler Douglas C.
Michelin & Recherche et Technique S.A.
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