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Wheel information estimating apparatus
| Details |
Inventors: Ohashi, Hideki; Kawai, Hiroyuki; Kojima, Hiroyoshi; Umeno, Takaji; Asano, Katsuhiro; Naito, Toshiharu; Onogi, Nobuyoshi;
Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota, JP); Kabushiki Kaisha Toyota Chuo Kenkyusho (Aichi-gun, JP)
Primary Examiner: Dombroske; George
Assistant Examiner:
Attorney, Agent or Firm: Oliff & Berridge, PLC
A wheel information estimating apparatus, which includes: a detecting device for detecting a wheel motion state relating to a movement of a tired wheel of a motor vehicle; an estimating device for estimating wheel information relating to the tired wheel, on the basis of the wheel motion state detected by the detecting device; and a modifying device for modifying an element relating to estimation of the wheel information, so as to improve an accuracy of estimating the wheel information. The element to be modified is selected from a movement of a center of rotation of the tired wheel as viewed in a plane in which the wheel is rotated, a signal applied from the detecting device to the estimating device, and an internal parameter used by the estimating means for estimating the wheel information. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a wheel information estimating apparatus which is able to estimate a specific kind of information relating to a tired wheel of a motor vehicle, with significantly improved accuracy.
The above object may be accomplished according to the principle of the present invention, which provides a wheel information estimating apparatus, comprising: a detecting device for detecting a wheel motion state relating to a movement of a tired wheel of a motor vehicle; estimating means for estimating wheel information relating to the tired wheel, on the basis of the wheel motion state detected by the detecting device; and modifying means for modifying an element relating to estimation of the wheel information, so as to improve an accuracy of estimating the wheel information, the element being at least one of: a movement of a center of rotation of the tired wheel as viewed in a plane in which the wheel is rotated; a signal applied from the detecting device to the estimating means; and an internal parameter used by the estimating means for estimating the wheel information.
The wheel motion state as indicated above may be selected from among an angular velocity, angular acceleration, vertical velocity, vertical acceleration, longitudinal velocity, and longitudinal acceleration.
With respect to a tired wheel which has a rim and a belt that are connected to each other through a torsion spring, for example, the wheel information as indicated above may be selected from among: an air pressure of a tire of the tired wheel; a radius of the tire; the moment of inertia of the tired wheel, more specifically, the moment of inertia of the rim and that of the belt; a spring constant of the torsion spring; a damping coefficient of the tire; a degree of contact of the tired wheel with a road surface, and a cornering power of the tire.
In one advantageous form of the wheel information estimating device as described above, the modifying means includes frequency characteristic modifying means for providing an optimum frequency characteristic of the wheel motion state to be supplied to the estimating means, by increasing a ratio of a strength of a selected one of a plurality of frequency components of the wheel motion state, the selected one being within a selected frequency range, to a strength of the other frequency components outside the selected frequency range
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Navigation and GPS 
