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Vehicle yaw/roll stability control with semi-active suspension

  • US 7,571,039 B2
  • Filed: 08/08/2006
  • Issued: 08/04/2009
  • Est. Priority Date: 08/08/2006
  • Status: Active Grant
First Claim
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1. A rollover avoidance system for changing the damping characteristics of suspension dampers at each wheel of a vehicle to mitigate a potential rollover condition, said system comprising:

  • a speed sensor providing a vehicle parameter speed signal of the speed of the vehicle;

    a roll rate sensor providing a vehicle parameter roll rate signal of the roll rate of the vehicle;

    a lateral acceleration sensor for providing a vehicle parameter lateral acceleration signal of a lateral acceleration of the vehicle;

    a yaw rate sensor for providing a vehicle parameter yaw rate signal of the yaw rate of the vehicle;

    a hand-wheel angle sensor for providing a vehicle parameter hand-wheel angle signal of the angle of a vehicle hand-wheel;

    a rollover indicator processor for calculating a roll stability indicator signal;

    a dynamic command processor for generating a desired stability command signal based on the vehicle parameter signals for a desired stiffness of the dampers; and

    a closed-loop controller responsive to vehicle parameter signals, the calculated roll stability indicator signal and the desired stability command signal, said closed-loop controller calculating an understeer or oversteer signal based on whether the vehicle is in an understeer or oversteer condition and a yaw stability control factor based on a yaw rate error signal and a side-slip error signal, said closed-loop controller further determining a roll error signal as the difference between the desired stability command signal and the calculated rollover stability indicator signal, said closed-loop controller also calculating a gain signal as a function of the vehicle speed signal, said closed-loop controller further calculating a closed-loop roll control factor based on the gain signal and the roll error signal, said closed-loop controller also determining a front to rear damper distribution of the damping characteristics of the suspension dampers based on the yaw rate error signal and the understeer or oversteer signal, said closed-loop controller generating a damper suspension command signal for each damper based on the front to rear distribution signal and the closed-loop roll control factor or the yaw stability control factor.

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