Mazda Motor Corporation

Naldec Corporation

Nsk Corporation

Kurashiki Kako Co., Ltd.

Shin Takehara

Toshiki Morita

Hiroshi Ohmura

Takeshi Edahiro

Kiyoshi Sakamoto

Mineharu Shibata

Shigefumi Hirabayashi

Ryuya Akita

Hiroyoshi Kumada

Naoki Ikeda

Haruyuki Taniguchi

Shingo Harada

Shoichi Kamimura

Norihiko Nakao

Hirofumi Seni

Chiaki Santo

Yutaka Tukahara

Hiroyuki Ito

Hiroshi Eda

Isamu Chikuma

Kenichi Watanabe

Tomoji Izumi

Takahiko Tanaka

Tetsuya Tachihata

Hiroo Shimoe

Hiroshi Hashino

Toshio Nakajima

Tomoko Nagata

Shigerumi Hirabayashi

Hirotaka Kanazawa

Takao Kijima

Akihiko Miyoshi

Atsuo Tomoda

Seiji Miyamoto

Kenji Hamada

Chikashi Tagawa

Takao Kljima

Yoichi Komoto

Katsutoshi Ota

Morihisa Hanafusa

Shoich Kamimura

A server for changing control gains of a vehicle is disclosed. The server includes a first receiver for receiving environment data obtained by vehicles of a plurality of users running in specific areas, and a second receiver for receiving learned data obtained by a plurality of users operating vehicles, and a storage device for accumulating the environment data and the learned data. The server further includes a transmitter for fetching environment data and learned data necessary to produce control gains from among the accumulated environment data and the learned data and transmitting the fetched environment data and learned data to a user requesting the environment data and the learned data. In a vehicle of the user, the control gains are newly produced and previously produced control gains are changed to the newly produced ones.

System and method for providing control gain of vehicle

An electric power steering system determines an assist control quantity for assist control by multiplying a turning torque applied to a steering wheel by a control gain, a damping control quantity for damping control by multiplying a rotational speed of motor by a control gain and a feedback control quantity for steering angle feedback control from a deviation between a target rotational speed of motor determined on the basis of the turning torque and an actual rotational speed of motor, and controls an electric motor with a motor control quantity that is determined on the basis of the assist control quantity, the damping control quantity and the feedback control quantity.

Electric power steering system for vehicle

In an electric power steering apparatus for a motor vehicle comprising a rack shaft ( ) provided with first and second rack portions ( and ), a pinion ( ) of a steering shaft for meshing with the first rack portion ( ), and a pinion ( ) of an electric motor ( ) for meshing with the second rack portion ( ), the first rack portion ( ) is constructed to have a constant gear ratio and the second rack portion ( ) is constructed to have a variable ratio so that an abnormal feeling during a steering operation is prevented and the lock to lock of a steering wheel is reduced to a small value.

Electric power steering apparatus for motor vehicle

A vehicle characteristic change system including characteristic information forming device for forming a characteristic information with which characteristics of an object vehicle are changed, information entry device for entering the characteristic information into the object vehicle, characteristic change device for changing the characteristics of the object vehicle in accordance with the characteristic information formed by the characteristic information forming means. Characteristics of a vehicle can be readily changed to meet a driver's taste, driving condition, driving circumstances and the like with compact system and low cost.

Vehicle characteristic change system and method

A vehicle characteristic change system includes a characteristic information forming device for forming characteristic information with which characteristics of an object vehicle are changed: information entry device is used for entering the characteristic information into the object vehicle, and a characteristic change device is used for changing the characteristics of the object vehicle in accordance with the characteristic information formed by the characteristic information forming device. Characteristics of a vehicle can be readily changed to meet preference of driver, a driver's taste, driving condition, driving circumstances and the like with a compact system and at low cost.

A suspension apparatus for vehicles capable of changing the characteristic of the suspension by controlling supply/release of fluid into/from hydraulic cylinders which are respectively provided between a vehicle body and-at least two wheels provided on the right and left side of the vehicle body. The suspension apparatus includes a pressure detection sensor for detecting a pressure in the hydraulic cylinders and an acceleration detection sensor for detecting a lateral acceleration signal of the vehicle body. A target pressure difference is set to control supply/release of the fluid into/from the right and left cylinders based on the detected pressure differences of the right and left cylinders. The target pressure difference is corrected based on the detected lateral acceleration, and a flow amount supplied into and drawn from control-objective cylinders of the hydraulic cylinders is controlled using signals detected so that a pressure difference within the right and left cylinders goes toward the corrected target pressure difference.

Suspension apparatus for changing characteristics of a vehicle

A fluid-contained engine mounting device, containing a fluid in a fluid container closed up air-tightly by an elastic top wall and an elastic bottom diaphragm which is divided by a partition wall into a first fluid chamber closed by the elastic top wall and a second fluid chamber closed by the elastic bottom diaphragm and confining a predetermined quantity of a gas in the first fluid chamber, absorbs vibrations of the engine transmitted thereto through expansion and contraction of the elastic top wall and elastic bottom diaphragm.

Fluid contained engine mounting device and method of manufacturing the

A fluid type of vibration damper apparatus containing fluid in a rigid fluid container divided by a partition formed with an orifice into two fluid chambers in communication with each other through the orifice, one of the fluid chambers being closed up air-tightly by an elastic top wall to which a subject body of vibration is attached and containing a predetermined quantity of gas so as to be in direct contact with the fluid therein.

Vibration damper apparatus

A vibration damping system for a vehicle includes a vibration sensor which detects vibration of a predetermined vibrating element on the vehicle, a vibrator which vibrates the vibrating element, and a drive control unit which controls the vibrator on the basis of the detecting signal from the vibration sensor so that a predetermined object vibration component of the vibration of the vibrating element is damped by the vibration generated by the vibrator. The drive control unit is restrained from controlling the vibrator according to the condition of a predetermined factor of the vehicle.

Vibration damping system for vehicle

A vibration damping system for a vehicle includes a vibration sensor which detects vibration of a particular vibrating element, an actuator which applies vibration to the particular vibrating element and a controller which receives a vibration signal output from the vibration sensor and controls the actuator to apply to the particular vibrating element such vibration that damps the vibration detected by the vibration sensor. The controller is provided with a sensitivity changing circuit which changes the sensitivity of the vibration sensor according to a predetermined condition of the vehicle.

An active type of mounting device for mounting a power unit to a vehicle body includes a vibratory member which generates vibrations so as to damp external vibrations applied to the mounting device from the power unit. The resonance frequency of the vibratory member is regulated by varying of the supporting stiffness or flexibility of the vibratory member or by varying of a variable mass attached to the vibratory member to obtain a specific frequency within a frequency band of external vibrations according to engine speed and/or vehicle speed.

Counter vibration generating power unit mounting device

A vibration damping system for a vehicle has a vibration sensor which detects vibration of solid elements on the vehicle and vibration of air inside the vehicle. A first vibrator supports a power unit relative to the vehicle body and directly vibrates the vehicle body. A second vibrator directly vibrates air inside the vehicle body. A drive control unit performs calculation on the basis of a detecting signal from the vibration sensor and controls the first and the second vibrators on the basis of the result of the calculation so that the vibration of the solid element and the vibration of air inside the vehicle body are damped. The vibrator control ratio of the first and second vibrators is changed according to the condition of a predetermined factor of the vehicle.

Active vibration damping system for a vehicle

A suspension apparatus for vehicles capable of changing a characteristic of suspension by controlling supply/release of fluid into/from hydraulic cylinders which are respectively provided between a vehicle body and each wheel. The apparatus detects vehicle height signals at a plurality of positions and extracts at least a bouncing component signal and a rolling component signal from vehicle-height signals detected by the plurality of vehicle-height sensors. Each of the bouncing component signal and rolling component signals are filtered and are used to control supply/release of fluid into/from hydraulic cylinders based on the filtered signals. A cut-off frequency for the rolling component signal set in said filtering unit is set higher than that for the bouncing component signal.

Vehicle suspension apparatus capable of preventing generation of

A vehicle having learning control includes a running condition detecting device for detecting a driving condition of the vehicle, a running characteristic control device for controlling a control gain to change a running characteristic of the vehicle and a gain control device for learning the running characteristic of the vehicle to change the control gain. The running characteristics of the vehicle can be controlled corresponding to various running conditions.

Learning control vehicle

A suspension control apparatus for a vehicle having hydraulic cylinders which are arranged respectively between a member of the vehicle side and members of each wheel side. A flow control valve controls the supply/drain of hydraulic fluid to/from an operation chamber of the hydraulic cylinders. The suspension control apparatus includes a lateral acceleration detection device which detects lateral acceleration G of the vehicle. A high-pass filter circuit performs high-pass processing on the lateral acceleration signal G. A rate of change G' of the lateral acceleration G is then calculated by a rate of change calculation unit, and the supply/drain of hydraulic fluid is regulated by a regulating unit which controls a flow control valve based on the rate of change G' of the lateral acceleration G.

Growing community of inventors

Hiroshima, Japan

Shin Takehara