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Method of detecting longitudinal force of tire and longitudinal force detecting apparatus used therein

  • US 7,257,997 B2
  • Filed: 03/30/2006
  • Issued: 08/21/2007
  • Est. Priority Date: 03/31/2005
  • Status: Expired due to Fees
First Claim
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1. A method of detecting a longitudinal force of a tire which detects the longitudinal force in a circumferential direction applied to the tire, comprising:

  • at least one mark provided in the tire on one circumferential line around a tire axis;

    a first sensor fixed to a vehicle body and capable of sequentially detecting a passage of said mark rotating together with the tire;

    a second sensor capable of detecting a rotation angle θ

    of an axle; and

    a computing means for computing a longitudinal force applied to the tire on the basis of an information from said first and second sensors,wherein said computing means comprises;

    (1) storing an information of a rotation angle θ

    r of the axle detected by said second sensor when receiving information of the passage signal from said first sensor according to the passage of said mark;

    (2) previously storing an information of a no-load rotation angle θ

    o of the axle detected by said second sensor when receiving information of the passage signal from said first sensor according to the passage of said mark, as the tire rotates in a no-load state;

    (3) computing a tire warp angle α

    r corresponding to a difference (θ

    o−

    θ

    r) between said rotation angle θ

    r and said no-load rotation angle θ

    o; and

    (4) computing a longitudinal force Fr of a tire applied during the running from said warp angle α

    r using a a previously determined relational equation between the tire warp angle α and

    the longitudinal force F applied to the tire.

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