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Roll stiffness control apparatus of vehicle

  • US 8,050,818 B2
  • Filed: 06/17/2005
  • Issued: 11/01/2011
  • Est. Priority Date: 07/07/2004
  • Status: Expired due to Fees
First Claim
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1. A roll stiffness control apparatus of a vehicle, comprising:

  • a controller which estimates a remaining capacity of front wheels to generate a lateral force and a remaining capacity of rear wheels to generate a lateral force, and which sets a roll stiffness distribution ratio between the front wheels and the rear wheels so as to reduce a difference between the remaining capacity of the front wheels to generate the lateral force and the remaining capacity of the rear wheels to generate the lateral force, whereinthe remaining capacity of the front wheels to generate a lateral force is a difference between a maximum lateral force of the front wheels and an actual lateral force currently generated by the front wheels, and the remaining capacity of the rear wheels to generate a lateral force is a difference between a maximum possible lateral force of the rear wheels and an actual lateral force currently generated by the rear wheels, whereinthe remaining capacity of the front wheels to generate the lateral force and the remaining capacity of the rear wheels to generate the lateral force is based at least on a vertical load applied to each of the respective front or rear wheel,the vehicle includes a yaw movement control device which controls a braking force and a driving force of each wheel to make a yaw movement of the vehicle come closer to a target yaw movement,the controller calculates a target roll stiffness distribution ratio of the front wheels as a sum of a basic roll stiffness distribution ratio and a roll stiffness distribution ratio increasing or decreasing amount of the front wheels, the roll stiffness distribution ratio increasing or decreasing amount being used to reduce the difference between the remaining capacity of the front wheels to generate the lateral force and the remaining capacity of the rear wheels to generate the lateral force,the controller controls reducing the roll stiffness distribution ratio of one wheel from among the front wheels and the rear wheels and increasing the roll stiffness distribution ratio of the other wheels from among the front wheels and the rear wheels, the remaining capacity of the one wheel to generate the lateral force being larger than the remaining capacity of the other wheels to generate the lateral force,the controller calculates the target roll stiffness distribution ratio of the rear wheels based on the target roll stiffness distribution ratio of the front wheels,the controller controls the roll stiffness distribution ratio between the front wheels and the rear wheels such that the roll stiffness distribution ratio of the front wheels and the rear wheels become the target roll stiffness distribution ratio of the front wheels and the rear wheels, andthe controller changes the basic roll stiffness distribution ratio such that the basic roll stiffness distribution ratio of the front wheels to the rear wheels is set higher when the yaw movement control device operates abnormally as compared to when the yaw movement control device operates normally.

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