Koyo Seiko Company, Ltd.

Jtekt Corporation

Tomoyasu Kada

Ryouhei Hayama

Shiro Nakano

Shingo Maeda

Shuuji Kimura

Katsutoshi Nishizaki

Masaya Segawa

Kenji Higashi

Kosuke Yamanaka

Naotake Kanda

Masami Naka

Masayasu Higashi

Takeo Iino

Masaharu Tagami

Aris Maroonian

Masayuki Ueno

Takeshi Watanabe

Yoshinobu Shimizu

Shirou Nakano

Atsushi Ishihara

Takanobu Takamatsu

Daisuke Maeda

Hiroshi Yoshimoto

Isao Kuramoto

Yoshihiro Goto

Shoji Koyama

Ryohei Hayama

A test system includes an actual machine including a test piece that is a mechanical element of a vehicle, the actual machine being installed in a first location; a control device that is installed in the first location, and controls the actual machine; a model installed in a second location away from the first location; and a data processor that is installed in the second location, and is connected to the actual machine or the control device via a communication line so that data communication is performed, the data processor acquiring data from the actual machine via the communication line so that an operation test is performed. The data processor calculates a target value for controlling the actual machine based on an output acquired by inputting the acquired data to the model, and the control device controls the actual machine based on the target value.

Test system

A vehicle test apparatus includes: a test article installation vehicle body to which four axles corresponding to four wheels that are a left front wheel, a right front wheel, a left rear wheel and a right rear wheel are attached, and on which a test article is installed; a first motion base that supports the test article installation vehicle body, and that allows the test article installation vehicle body to make motions of six degrees of freedom; and four second motion bases each of which supports a corresponding one of the axles, and each of which allows a corresponding one of the axles to make motions of six degrees of freedom.

Vehicle test apparatus and vehicle test system

A vehicle steering apparatus in which a mechanical coupling between a steering member and steered wheels is uncoupled, includes a steering actuator for driving a steered mechanism and a control unit for drive-controlling the steering actuator. The control unit reduces steering-stiffness using a PID control portion for drive-controlling the steering actuator according to a deviation between a target steered angle and a steered-angle detected by the steered angle sensor. A gain setting portion sets gains of the PID control portion to be relatively low when a predetermined condition is satisfied.

Vehicle steering apparatus

A motor vehicle steering system steers vehicle wheels in response to the operation of an operation member for steering a vehicle. The system includes a rutted road judging unit which judges whether the vehicle is driving on a rutted road or not, and a steering enhancement control unit which enhances steering of vehicle wheels in response to operation of the operation member when the rutted road judging unit judges that the vehicle is driving on a rutted road than when the rutted road judging unit judges that the vehicle is not driving on a rutted road.

Motor vehicle steering system

A steered shaft of a steered mechanism is rigidly fixed to a vehicle body. Steering-stiffness is reduced by a lowpass filter for filtering a steered angle detected by a steered angle sensor. A deviation between a target steered angle and the filtered steered angle detected by the steered angle sensor is input to a PID control unit. A gain setting unit sets each of gains for PID control at a low value to thereby reduce steering-stiffness. The PID control unit outputs a target current. A drive circuit performs, e.g., PID control of the steering actuator.

It is one object of the present invention to provide a steering device for a vehicle improving a resolution of detecting a steering reaction force thereby to control precisely a reaction actuator and to improve a steering feeling. The steering device for the vehicle is equipped with a reaction actuatoracting a steering reaction force on a steering wheel. This device further includes a steering angle sensordetecting a steering angle &#x3b4;h of the steering wheel, a controllercontrolling the reaction actuatoraccording to the steering angle &#x3b4;h, a torque sensordetecting a steering torque Th acted on the steering wheel. The controllercontrols in a feedback way the reaction actuatorbased on the steering torque Th in a predetermined range including a middle point of the steering angle. The controllerdrives, in a open-loop way without feed-backing the steering torque Th, the reaction actuatorout of the predetermined range of the steering angle &#x3b4;h.

Steering device for vehicle

A rotation transmitting apparatus comprises a first sun gear joined to a first shaft so as to rotate interlockingly, a second shaft arranged to the first shaft coaxially, a second sun gear joined to the second shaft so as to rotate interlockingly, a first planetary gear meshed with the first sun gear, a second planetary gear rotating with the first planetary gear and meshed with the second sun gear, and a carrier supporting the first and second planetary gears and arranged to be driven by a differential electric motor. In particular, the number of teeth of each of the first and second sun gears and the first and second planetary gears is determined so that the ratio of a torque applied to the second shaft to a torque applied to the first shaft ranges from 1:0.7 to 1:0.9.

Steering apparatus

A rotation transmitting apparatus according to the present invention includes a first sun gear, a second sun gear, first planetary gears and second planetary gears. A carrier for supporting the respective planetary gears is integrally provided with a rotor of a speed change motor for changing a speed of rotation to be transmitted, so that the number of mesh portions in the gears is reduced. Further, the rotor is formed of a cylindrical shape and an input shaft for rotating the first sun gear is inserted into the rotor, so that a limited space is effectively used.

Rotation transmitting apparatus and vehicle steering apparatus

The steering device is constructed by supporting a center portion of a rectangle-plate-shaped operation plate at one end of a supporting shaft projected from the front face of a dashboard so as to freely swing in right and left directions. A steering apparatus for a vehicle having the steering device detects the swing direction and the swing angle of the operation plate with a steering angle sensor provided at a support portion and moves a steering mechanism in the detected direction in accordance with the detected angle so as to steer the vehicle. With this structure, a load in steering can be decreased and tiredness in driving can be reduced. Furthermore, such a steering apparatus can realize a steering device which physically handicapped drivers can operate easily.

Steering apparatus for vehicle

In a normal state, a reaction force actuator () applies an operation reaction force to an steering member () through a planetary gear mechanism (). When failure occurs in a steering actuator (), the reaction force actuator () is turned off, and a plunger () locks the rotation of one element () which is connected to the reaction force actuator (), in the planetary gear mechanism (). In turn, a manual steering mode is set up in which a rotation of the steering member () is transmitted to a pinion gear () at a transmission ratio of the carrier () holding planetary gears () and a sun gear ().

Vehicle steering device

A steering control unit () employs the detected results of environmental conditions given by an environmental-condition detecting unit () and issues an operating command to a steering motor (M) attached to a steering mechanism () as a steering actuator when, for example, an object approaching from behind at a speed exceeding a predetermined speed is detected and when the steering control unit () decides there is the possibility that the object may collide with one's own vehicle. Then the steering control unit () causes the steering motor (M) to make the steering mechanism () perform forcible steering in order to avoid danger.

Vehicle steering system

In a vehicle steering apparatus, a steering actuator is controlled so that the steering angle varies in accordance with the operation of an operating member. A transmission mechanism connects an operating side rotating member that is mechanically connected to the operating member and a vehicle wheel side rotating member that is mechanically connected to the vehicle wheels so that the mutual transmission of rotation is possible. Furthermore, the rotational transmission ratio between the operating side rotating member and the vehicle wheel side rotating member can be varied.

A controller for an electric power steering system which generates a steering assist force by an electric motor driven on the basis of a steering torque applied to an operation member. The controller calculates an assist target electric current value by adding a first inertia compensation value, generated in accordance with a first steering torque differential value corresponding to a time-based differential value of the steering torque, to a basic assist electric current value determined in accordance with the steering torque, and preferably by further adding thereto a second inertia compensation value. This second inertia compensation value may be generated in accordance with a second steering torque differential value determined as a time-based differential value of a steering torque component obtained by removing a high frequency component from the steering torque.

Electric power steering controller

An electric power steering system, which controls an electric motor on the basis of a target electric current determined in accordance with a steering torque and applies a driving force from the electric motor to a steering mechanism. The system includes: a steering torque sensor; a target current setting circuit for determining the target electric current in accordance with the steering torque on the basis of an assist characteristic indicative of a relationship between the steering torque and the target electric current; a motor controlling circuit for controlling the electric motor on the basis of the target electric current; a traveling state judging circuit for judging whether or not a motor vehicle is in a slalom traveling state; and an assist characteristic modifying circuit for offsetting the assist characteristic from an initial characteristic level when the motor vehicle is in the slalom traveling state.

Electric power steering system

An electric power steering system which assists a steering operation by controlling an electric motor on the basis of a target electric current determined in accordance with a steering torque applied to an operation member and applying a driving force to a steering mechanism from the electric motor. The system includes steering torque detecting section; target electric current determining circuit for determining a target electric current in accordance with the steering torque on the basis of an assist characteristic; and motor controlling circuit for controlling the electric motor on the basis of the target electric current. The assist characteristic is offset from an initial characteristic when a motor vehicle incorporating the system is in a predetermined turning state.

Growing community of inventors

Kaizuka, Japan

Tomoyasu Kada