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Stability control apparatus and load measuring instrument for wheel supporting rolling bearing unit

  • US 7,359,787 B2
  • Filed: 09/03/2004
  • Issued: 04/15/2008
  • Est. Priority Date: 09/03/2003
  • Status: Active Grant
First Claim
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1. A stability control apparatus, comprising:

  • a grip detector that changes an output based on a grip force applied in a direction hindering a slippage of a wheel, acting on a contact face between the wheel supported by a wheel supporting rolling bearing unit and the road surface, the wheel supporting rolling bearing unit for supporting freely rotatably the wheel to a vehicle body; and

    a controller that performs a control for keeping a running stability of the vehicle in response to an input of a detection signal of the grip detector;

    wherein the controller includes;

    a function of calculating a value that is changed in relation to a normal grip force supposedly applied to a contact face for the wheel, based on a speed signal indicating a running speed of the vehicle that is detected by a speed sensor, and a signal indicating an acceleration exerted on the vehicle that is detected by an acceleration sensor mounted on the vehicle, when there is no slippage for hampering the running stability of the vehicle on the contact face between each wheel and the road surface;

    a function of comparing a value that is changed in relation to an actual grip force actually applied to the contact face for the wheel, which is obtained from a detection signal of the grip detector built into each wheel supporting rolling bearing unit, and the value that is changed in relation to the normal grip force; and

    a function of making a control for keeping the stability of the vehicle, when the value that is changed in relation to the actual grip force and the value that is changed in relation to the normal grip force are different beyond a preset threshold value.

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