Method of detecting longitudinal force of tire and longitudinal force detecting apparatus used therein
First Claim
Patent Images
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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Accused Products
Abstract
An apparatus for detecting a longitudinal force of a tire is provided with at least one mark (3) provided in on one circumferential line (j) in a tire (2), a first sensor (5) disposed in a vehicle body side (4) and capable of detecting a passage of the mark (3), a second sensor (7) capable of detecting a rotation angle (θ) of an axle (6), and a computing device (8) for computing a longitudinal force (Fr) of the tire (2) on the basis of an information of the first and second sensors (5, 7). The computing device (8) sequentially stores a rotation angle (θr) of the axle (6) when the mark (3) passes through the first sensor (5). Further, the computing device (8) computes a tire warp angle (αr) corresponding to a difference (θo−θr) between a no-load rotation angle θo (a rotation angle of the axle (6) in a no-load state) stored in advance and the rotation angle θr, and sequentially computes a tire longitudinal force (Fr) of a tire applied during the running from the warp angle (αr), using a previously determined relational equation F=f(α) between the warp angle (α) and the tire longitudinal force (F).
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Citations
10 Claims
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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:
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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; anda 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. - View Dependent Claims (2, 3)
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4. An apparatus for detecting a longitudinal force of a tire which detects the longitudinal force in a circumferential direction applied to the tire, comprising:
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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; anda 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; a rotation angle information memory portion sequentially storing an information of a rotation angle θ
r of the axle detected by said second sensor when receiving the information of the passage signal from said first sensor according to the passage of said mark;a no-load rotation angle information memory portion previously storing an information of a no-load rotation angle θ
o of the axle detected by said second sensor when receiving the 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;a first computing portion sequentially computing a tire warp angle α
r corresponding to a difference (θ
o−
θ
r) between the rotation angle θ
r of said rotation angle information memory portion and the no-load rotation angle θ
o of said no-load rotation angle information memory portion; anda second computing portion sequentially computing a longitudinal force Fr of a tire applied during the running from said warp angle α
r computed by said first computing portion, using a previously determined relational equation between the warp angle α and
the longitudinal force F applied to the tire. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification
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Current AssigneeAdvics Company Limited (Aisin Corp.), Sumitomo Rubber Industries Limited
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Original AssigneeAdvics Company Limited (Aisin Corp.), Sumitomo Rubber Industries Limited
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InventorsMiyoshi, Akihiro, Nakano, Keita
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Primary Examiner(s)Allen; Andre J.
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Application NumberUS11/392,704Publication NumberTime in Patent Office509 DaysField of Search731/46, 340/445US Class Current73/146CPC Class CodesB60T 8/1725 Using tyre sensors, e.g. Si...B60T 8/52 Torque sensing, i.e. wherei...G01N 19/02 Measuring coefficient of fr...
