Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Toyota Jidosha Kabushiki Kaisha & Kabushiki Kaisha Toyota Chuo Kenkyusho

Hiroyoshi Kojima

Takaji Umeno

Hideki Ohashi

Hiroyuki Kawai

Katsuhiro Asano

Nobuyoshi Onogi

Toshiharu Naito

Hideo Inoue

Hajime Kamimae

Takeyasu Taguchi

Hisashi Nishikawa

Mitsuhiko Morita

Satoru Ohsaku

Kenji Fujiwara

Nobuo Hiraiwa

Yasuhiko Mishio

Ichisei Kamimura

Yuuichi Inoue

Masashi Mure

Toshimichi Takahashi

Mitsunobu Hattori

A rotation angle detection device includes: a detection portion that detects detection angle that univocally corresponds to rotation angle of a rotating body which is within a predetermined range, wherein the detection angle linearly increases from a minimum value to a maximum value as the rotation angle increases within a unit range, and the detection angle changes from the maximum value to the minimum value or from the minimum value to the maximum value at a boundary between unit ranges that are adjacent to each other; and a correction portion that corrects the detection angle so that the detection angle detected in the predetermined range has linear characteristics, if the boundary between the unit ranges is contained in the predetermined range.

Rotation angle detection device, and rotation angle detection method

A tire protecting apparatus mounted on a vehicle provided with a wheel having a tire on a wheel filled with pressurized air, which protects the tire from abnormally deforming while the vehicle is running, is provided with a tire temperature sensor that detects a temperature of the tire, and a determinator that determines whether it is necessary to cool the tire based on the tire temperature detected by the tire temperature sensor when there is a possibility that abnormal tire deformation will occur. Accordingly, the invention protects the tire from abnormally deforming by considering the temperature of the tire while the vehicle is running.

Tire protecting apparatus

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.

Wheel information estimating apparatus

An apparatus for estimating an air pressure of a tire of a tired wheel of a motor vehicle, on the basis of a temperature of the tire as well as a motion of the tired wheel, preferably including a temperature-related variable sensor for detecting a temperature-related variable related to the temperature of the tire, and an estimating device for estimating the air pressure of the tire on the basis of the temperature-related variable as well as the motion of the tired wheel.

Apparatus for estimating vehicle tire air pressure from not only tired

In a tire air pressure estimation based upon vibration components extracted rom a vehicle wheel speed signal, when the vehicle is a driven vehicle wheel, the precision of estimation is improved by canceling the components of vibration due to the resonance of the drive system from the vibration components based upon which the estimation calculation is made. The vibration components due to the resonance of the drive system can be canceled by canceling those vibration components extracted from the vehicle wheel speed signal which are the same in the phase between left and right driven vehicle wheels. When the tire air pressure of one of a pair of left and right driven vehicle wheels is lower than that of the other, the lower tire air pressure is more correctly estimated. Therefore, the higher tire air pressure may be estimated according to the lower tire air pressure against the drive system resonance.

Device for estimating air pressure of tire from vibration components of

A suspension system of an automotive vehicle including a spring disposed between an unsprung mass and a sprung mass for resiliently supporting thereon the sprung mass and a damping force generating mechanism arranged in parallel with the spring for absorbing vibration of the sprung mass relative to the unsprung mass, wherein the suspension system is provided with a spring element disposed in series with the damping force generating mechanism between the unsprung and sprung masses and an electrically operated control mechanism for controlling a spring coefficient of the spring element.

Suspension system of automotive vehicle and electric control apparatus

A damping force control system for an automotive vehicle having a semiactive damper mechanism provided between an unsprung mass and a sprung mass of the vehicle, wherein vertical velocity of the sprung mass is detected so that switchover of the semiactive damper mechanism from a low damping state to a high damping state is permitted upon lapse of a predetermined time after it has been detected that an absolute value of the detected vertical velocity of the sprung mass exceeded a preselected magnitude of approximate zero.

Damping force control system for automotive vehicle

The invention is a method and apparatus wherein a disturbance acting on a tired wheel of a vehicle is estimated by a disturbance observer on the basis of the detected angular velocity of the wheel. In one form of the method, the wheel angular velocity is compensated for the disturbance, depending upon the amount of change of the wheel angular velocity caused by the disturbance. In another form of the method, the angular acceleration of the wheel as well as the disturbance is estimated by the observer, and the moment of inertia of the wheel is obtained according to a relationship between the estimated disturbance and angular acceleration of the wheel.

Method and apparatus for estimating disturbance acting on vehicle tired

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Nishio, Japan

Hiroyoshi Kojima