Mazda Motor Corporation

Kiyoshi Sakamoto

Shin Takehara

Hiroshi Ohmura

Fumitaka Andou

Shigefumi Hirabayashi

Tomoji Izumi

Tetsuya Tachihata

Kazufumi Adachi

Toshio Hayashi

Shigerumi Hirabayashi

Tomoko Nagata

Osamu Michihira

Takao Kijima

Ryuya Akita

Mineharu Shibata

Atsushi Okamitsu

Seiji Miyamoto

Tsukasa Harada

Yasuhiro Takabe

Hideyuki Okada

Takao Kljima

Koki Makino

In an air pressure information display system of a vehicle tire, a vehicle () has air pressure sensors (-) for detecting the air pressure of a vehicle tire (-), and transmitting air pressure information indicating the detected air pressure via a wireless communication, and an informing unit () installed in a gas station or the like has a display module () for displaying the received air pressure information.

Air pressure information display system of vehicle tire

An air pressure information display device of a vehicle tire has a normal air pressure storage module () for storing a normal air pressure of a tire corresponding to a tire temperature, an excessive/deficient amount detection module () for detecting the excessive/deficient amount from the normal air pressure on the basis of the stored normal air pressure, and air pressure information detected by an air pressure information detection module (), and a display control module () for controlling a display () to display the detected excessive/deficient amount. Hence, since the user is informed of the excessive/deficient amount from the normal air pressure, he or she can appropriately determine an air pressure state of a tire even when he or she does not recognize the normal air pressure.

Air pressure information display device of vehicle tire

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 air pressure warning device of a vehicle tire has an excessive/deficient amount calculation module ( ) for calculating an excessive/deficient amount on the basis of the difference between a normal air pressure stored in a normal air pressure storage module ( ) and a detected tire air pressure, an informing control module ( ) for controlling an informing module ( ) to inform an excessive/deficient state of the tire air pressure determined based on the calculated excessive/deficient amount, and a normal air pressure correction module for increasing the readout normal air pressure by a predetermined value when an expressway traveling detection module ( ) detects that the vehicle is on an expressway.

Air pressure warning device of vehicle tire

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 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

The posture of the automotive vehicle body is controlled by supplying or discharging the operating fluid to or from the cylinder unit for each wheel, which is interposed between a sprang weight and an unsprung weight. When an incident occurs to such an extent that the control over the posture of the vehicle body cannot be implemented in a normal way, the control is suspended. When such an incident occurs during cornering of the vehicle body, the suspension of the control over the posture of the body is so modified as to implement a special control, preferably control being made so as to lower the vehicle height by forcibly discharging the operating fluid from the cylinder unit. This prevents the vehicle body from being leaned after the end of the cornering. A decision as to cornering is made by taking advantage of the state of operation of the steering wheel or the magnitude of transverse acceleration. Preferably, a decision is made to determine if the difference in inner pressures between the left-hand and right-hand cylinder units is a predetermined value or higher.

Suspension system for automotive vehicle

An operation apparatus for a vehicle automatic transmission mechanism includes first and second actuators, connected in parallel with a hydraulic valve, for driving the hydraulic valve to switch a travel range of an automatic transmission mechanism, a control unit for controlling the first and second actuators, and a transmission operation unit for outputting a range signal indicating a presently set travel range to the control unit. The transmission operation unit includes a stroke contact type operation switch on which travel ranges to be set are sequentially aligned along a predetermined path. The control unit includes a first CPU, connected to the first actuator, for controlling a driving operation of the first actuator, a second CPU, connected to the second actuator, for controlling a driving operation of the second actuator, and a third CPU, connected to the first and second CPUs, for setting, in a driving state, one of the first and second actuators connected to one of the first and second CPUs, which CPU serves as a main unit, for monitoring system failed states of the first and second CPUs, for, when the third CPU determines that a system failed state occurs, inhibiting the driving operation of the actuator connected to the system-failed CPU, and for permitting the driving operation of the actuator connected to the CPU which does not suffer from the system failed state.

Growing community of inventors

Chiba-ken, Japan

Kiyoshi Sakamoto