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System for controlling the stability of a vehicle using an algorithm comparing average slopes of variation of a parameter

  • US 7,197,380 B2
  • Filed: 01/18/2005
  • Issued: 03/27/2007
  • Est. Priority Date: 01/16/2004
  • Status: Expired due to Fees
First Claim
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1. A vehicle stability control system in which a characteristic parameter Q of a functioning of a tire of the vehicle intended to roll on the ground varies as a function of a parameter P according to a certain law, an optimum value of the parameter P being imposed by a controller directly or indirectly, so as to act on at least one of elements chosen from a group comprising a rotation torque applied to the tire, a steering angle of the tire, a camber angle of the tire, and a vertical force applied to the tire, in which the controller comprises means for:

  • determining coefficients A[avg/p], by direct calculation or by a regression, from a sufficient number of pairs (Pi, Qi), so as to model a first variation curve Qi=f(Pi, A[avg/p]) including the origin, and the pair or pairs (Qi, Pi), in which Qi is different from zero,determining an indicator of an average slope α

    1 of the first variation curve,determining coefficients B[avg/p], by direct calculation or by a regression, from a sufficient number of pairs (Qi, Pi), so as to model a second variation curve Qi=f(Pi, B[avg/p]) including the pair or pairs (Qi, Pi), in which Qi is different from zero,determining an indicator of an average slope α

    2 of the second variation curve,as long as the difference between α

    1 and α

    2 is less than a predetermined slope threshold, repeating the previous operations for each new acquisition of a pair of values (Pi, Qi),if the difference between α

    1 and α

    2 exceeds the predetermined slope threshold, determining a target slip pCavg using at least the last pair of values (Pi, Qi).

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