Koyo Seiko Company, Ltd.

Jtekt Corporation

Other

Hideki Higashira

Shiro Nakano

Yoshinobu Shimizu

Masashi Hattori

Hiroshi Kawaguchi

Yuji Kariatsumari

Takeshi Ueda

Mitsuhiko Nishimoto

Naoki Maeda

Shirou Nakano

Ken Matsubara

Masanori Arima

Manabu Takaoka

Yasuyuki Yoshii

Satoshi Kawai

Yasuhiko Hasuda

Shinsuke Terada

Yasunobu Tomizawa

Seiji Uematsu

Yoshiaki Nakano

Ichiro Okabe

Hirakushi Suzou

A vehicle includes: a pair of front wheels; a pair of rear wheels; a front-wheel motor configured to drive the front wheels; a rear-wheel motor configured to drive the rear wheels; and a reducer configured to reduce a rotation speed of one of the front-wheel motor and the rear-wheel motor, and transmit drive power to the wheels driven by one of the motors. The one of the front-wheel motor and the rear-wheel motor is a motor with a rotation speed higher and torque lower than those of the other one of the motors.

Vehicle and vehicle driving device

A torque detecting apparatus detects a torque applied to a first shaft, based on a relative rotational displacement between the first shaft and a second shaft caused by torsion in a coupling shaft which couples the first shaft and the second shaft. The torque detecting apparatus includes: first and second magnets which are coupled to the first shaft and the second shaft so as to rotate together with the first shaft and second shaft, respectively; and a plurality of magnetic sensors which are disposed between the first magnet and the second magnet and which detect a rotational angle of the first shaft and a rotational angle of the second shaft.

Torque detecting apparatus

A motor controller controls a motor including a rotor and a stator opposed to the rotor. The motor controller includes an electric current driving unit which drives the motor with an axis electric current value defined in a rotating coordinate system defined with respect to a control angle that is a rotation angle for control, a control angle computing unit which computes a current value of the control angle by adding an addition angle to a previous value of the control angle in each predetermined computing cycle, and an addition angle computing unit which computes the addition angle according to a torque to be generated by the motor or a response of the motor to the axis electric current value.

Motor control device and vehicle-steering device comprising same

A controller applies slight rotational torque to a drive gear of a reduction mechanism also in a predetermined range in which a motor does not produce any steering operation assist force. That is, the motor is caused to produce slight rotational torque not enough to drive a driven gear, and the rotational torque direction is reversed under a given condition. Accordingly, a backlash between the drive gear and the driven gear is eliminated.

Electric power steering system

An electric power steering system according to the present invention comprises: a sensor module including a steering torque sensor and a control circuit housed therein; and a motor module including an electric motor and a motor driving circuit housed therein. The sensor module and the motor module are physically separately mounted in the electric power steering system. Since the sensor module and the motor module are physically separated, these modules can separately be produced, and the steering torque sensor and the electric motor can independently be adjusted.

A steering apparatus for automobiles having steering operating means which is not mechanically connected to a steering mechanism, a pair of steering motors provided to different positions in the steering mechanism, and a steering control unit for distributing a necessary steering force which is obtained on the basis of a deviation between an operating position of the steering operating means and an actual operating position of the steering mechanism in a prescribed ratio so as to determine target values of the outputs of the steering motors.

Steering apparatus for automobile

A reaction force actuator 3 for giving reaction force to a steering wheel 2 disengaged from a steering mechanism 1 is provided. A steering control unit 4 is provided to control so that the reaction force decided in accordance with the detected results of the running speed by a vehicle speed sensor 6 and the detected results of a road surface condition by a current sensor 7a, an open air temperature sensor 7b, a wiper switch 7c and a supersonic wave sensor 7d. Also, the steering motor 5 for applying the steering force to the steering mechanism 1 is operated smaller at higher speed and larger at slower speed at running by the operation of the steering control unit 4 in accordance with the detected results of the running speed by the vehicle speed sensor 6. Therefore, the same steering feelings as those of the coupling type steering system are obtained to realize a steering system enabling the reliable steering operation to effect under the various different running conditions. Also, the bother of the steering operation at the slow speed or at the stop time is dissolved by simple construction.

Automobile steering system including reaction feedback to operator

In an electric power steering apparatus, a motor current target value of a steering force assisting motor is determined on the basis of a torque detected by a torque sensor. The drive of the motor is controlled using the motor current target value as a target value of an automatic control, and using the driving current of the motor as a feedback value of the automatic control. When the detected torque is within a predetermined range, the motor is inhibited from being driven in the direction opposite to the detected torque. The electric power steering apparatus has a motor non-drive detecting circuit for detecting that the motor current target value is zero, and a drive inhibition holding circuit for holding the motor drive inhibition state, wherein the motor is inhibited from being driven in the direction opposite to the detected torque, until the motor non-drive detecting circuit detects that the motor current target value is zero. Even when a CPU runs away and the motor current target value becomes excessive, self-rotation of a steering wheel and reverse assist caused by the flow of excess motor current are prevented. Even when a CPU runs away exists and assist and assist inhibition are repeated, steering is prevented from becoming unstable.

Torque sensing power steering device with abnormality detection, dead

A power transmission apparatus for vehicle capable of obtaining a plurality of transmission characteristics by moving spools of variable throttle member 6 according to controlling current flowing to a driving coil 7 by steps, wherein a spool chamber 60 housing a first and second spools 61, 62 therein is communicated with discharge side of a vane pump 3 according to first and second communicating holes 54, 55. And by controlling current flowing to the driving coil 7 by steps, two kinds of magnetic fields, intense and weak are formed in the spool chamber 60. In the case where the first spool 61 moves to the position where it is contacted with the inside end of the spool chamber 60 by the action of the weak magnetic field, it closes an opening end of one communicating hole 54, and in the case where the second spool 62 moves to the position where it is contacted with the first spool 61, it opens an opening end of the other communicating hole 55. Three kinds of different transmission characteristics are obtained in the above mentioned cases and case of current cutoff, and the positions of the first and second spools 61, 62 do not vary in the respective cases. Thereby, positional variation caused at, spools are prevented and the respective transmission characteristics are stabilized.

Power transmission apparatus for vehicle

A system for controlling the temperature of a lamp annealer which system comprises a group of lamps for heating an article to be heated, a radiation thermometer for measuring the temperature of the article, and a lamp output conroller for controlling the output of the lamps based on the output of the thermometer, the controller having stored therein a target temperature control pattern. The system is adapted to effect open-loop control by controlling the lamp output according to a predetermined lamp output control pattern until the thermometer reaches a specified temperature range enabling closed-loop control and not lower than the lowest temperature measurable by the thermometer, to compare the gradient of temperatures measured by the thermometer with the gradient of the target temperature control pattern to determine the ratio of the former to the latter after the output of the thermometer has reached the temperature range, to continue the open-loop control while the gradient ratio is smaller than a predetermined control change-over reference value, and to perform closed-loop control by controlling the lamp output after the gradient ratio has increased to not smaller than the reference value so that the temperature measured matches the target temperature control pattern.

Growing community of inventors

Ikoma, Japan

Hideki Higashira