Komatsu Corporation

Renesas Electronics Corporation

Yokogawa Electric Corporation

Other

Yokogawa Hokushin Electric Corp.

Yutaka Ono

Yuji Shimizu

Akane Hiroshima

Yutaka Koizumi

Mitsuhiro Nikaido

Shigeru Hashida

Tadashi Iijima

Hayato Kinoshita

Akihiko Sakamoto

Yasuhiko Muramatsu

Eiji Yamazaki

Masaki Takahashi

Reiji Yamasaki

Haruo Higuchi

Masashi Yoshimura

Hideo Banzai

Hajime Kuwahara

Koichi Sato

Hiroshi Shimada

Shintaro Kobayashi

Hitoshi Morimoto

Yasuhito Kosugi

Atsufumi Kimura

Shotaro Shindo

Yoichi Kikukawa

Koji Yokoyama

Susumu Ohta

Yayoi Tsuchiya

Toshihiro Kanehara

Norihiko Hatano

Syotoro Shindo

Takaharu Matsumoto

Ryuichi Jimbo

Fumio Kaiho

Hiroyuki Shinomiya

Yoichi Fujii

Toshifumi Igarashi

A motor grader includes a vehicular body, a blade, a front wheel located in front of the blade, two rear wheels located in the rear of the blade, a first sensor which detects a position of the vehicular body as first sensor information, a second sensor which detects an inclination of the vehicular body as second sensor information, a first swing member which rotatably supports both of the two rear wheels arranged in the front and rear relation and is swingably supported by the vehicular body, and a third sensor which detects an angle of swing of the first swing member with respect to the vehicular body as third sensor information. A method of controlling a motor grader includes obtaining the first to third sensor information and calculating positions of the rear wheels based on the obtained first to third sensor information.

Method of controlling motor grader, motor grader, and work management system for motor grader

A work vehicle is capable of readily knowing an amount of soil built up on a front surface of a blade. A motor grader includes a vehicular body frame, a blade, and an image pick-up apparatus. The blade is arranged between a front end of the vehicular body frame and a rear end of the vehicular body frame. The blade is supported on the vehicular body frame. The image pick-up apparatus is arranged in front of the blade. At least a part of the blade is included within an angle of view of the image pick-up apparatus. A revolving operation of the blade is automatically controlled based on the amount of soil built up on the front surface of the blade.

Work vehicle having image pick-up apparatus

A work implement of a motor grader in which a blade can readily be replaced includes a shift cylinder assembly and a blade. The shift cylinder assembly includes a blade shift cylinder and a rail which carries out reciprocating motion with extending and retracting of the blade shift cylinder. The blade is removably attached to the shift cylinder assembly. The blade includes a hook and the shift cylinder assembly includes a hook reception portion. The hook is hooked on the hook reception portion.

Work implement of motor grader and motor grader

A pulse signal generator suitable for generating a two-phase pulse signal required as information of a rotation angle of a motor from a motor control device is provided. According to an embodiment, the pulse signal generator includes: a compensation unit that outputs a compensation signal for compensating for the deviation between the angle information representing the rotation angle of the rotor provided in the resolver and the fed back angle information; a counter pulse output unit that outputs a counter pulse having a frequency corresponding to the compensation amount of the compensation signal and code information representing the sign of the compensation signal, and a pulse processing unit that outputs a count value by a counter as the angle information, which counts the pulse according to the code information, the pulse processing unit generating two-phase pulse signals PA and PB using the values of the counter.

Pulse signal generator and angle detection system including the same

A control system for a work vehicle having a work implement, the control system including: a position measurement unit for measuring a position of a windrow produced by grading work; a work route setting unit for setting a work route based on the position of the windrow that has been measured by the position measurement unit; and a travel control unit for controlling the work vehicle to travel along the work route that has been set by the work route setting unit.

Control system and method for work vehicle

A motor grader includes a blade between a front wheel and a rear wheel, the blade being attached to a swing circle which adjusts a blade angle. A control method performed in the motor grader includes obtaining current topography in front of the motor grader and adjusting the blade angle to an angle in accordance with the current topography by revolving the swing circle.

Method of controlling motor grader and motor grader

A control method is performed in a motor grader, the motor grader including a blade between a front wheel and a rear wheel, the blade being attached to a swing circle which adjusts a blade angle. The control method includes detecting a load applied to the blade and revolving, when the detected load is larger in value than a predetermined reference value, the swing circle in such a direction that the blade angle is smaller than the blade angle at the time of detection of that value.

Control method and motor grader

A method of controlling a motor grader including a blade provided between a front wheel and a rear wheel which are attached to a vehicular body and a height adjustment mechanism which adjusts a height of the blade includes obtaining current topography in front of the motor grader and adjusting a height of the blade with respect to the front wheel based on the current topography.

In a sensorless control of a motor, due to the characteristic of a response frequency, an induced voltage, a magnetic pole position estimation gain, a current control gain, and a speed control gain are closely related. An object of the invention is to enable the induced voltage and the frequency characteristic of a magnetic pole position estimation system to be clearly designed and to theoretically and quantitatively design all of the control gains necessary for the sensorless control so as to solve a problem that a method of designing those parameters cannot be established and the parameters have to be adjusted in a try and error manner. A control device has an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer and a controller controlling the motor on the basis of the estimation induced voltage and the phase error.

Control device

The present invention provides a signal processor that improves a resolution of a phase detection without increasing a clock frequency of a controller or decreasing a frequency of an excitation signal. A signal processorincludes a comparatorthat compares a signal obtained by phase modulating a carrier frequency at a rotor rotation angle of a resolver with a dither signal.

Signal processor and control apparatus

A signal converterincludes, for at least two-phase signals detected by a resolver excited by a carrier signal having a carrier frequency fc, a first phase shifterthat shifts a phase of a first phase signal of the resolver with a pole at a frequency f1 lower than the carrier frequency fc, a second phase shifterthat shifts a phase of a second phase signal of the resolver with a pole at a frequency f2 higher than the carrier frequency fc, and a synthesizerthat combines the phase-shifted first phase signal with the phase-shifted second phase signal.

Signal converter and control device

A control apparatus includes, for at least two-phase signals detected from a resolver excited by a carrier signal having a carrier frequency fc, a first phase shifter that shifts a phase of a first phase signal of the resolver with a pole at a frequency f1 lower than the carrier frequency fc, a second phase shifter that shifts a phase of a second phase signal of the resolver with a pole at a frequency f2 higher than the carrier frequency fc, a signal generator that generates a correction signal for canceling out an error component of the carrier signal, and a synthesizer that synthesizes the phase-shifted first phase signal, the phase-shifted second signal, and the correction signal for canceling out the error component, in order to create a phase-modulated signal that is the carrier signal being modulated at a rotation angle of a rotor of the resolver.

Control apparatus

A signal converterincludes, for at least two-phase signals detected by a resolver excited by a carrier signal having a carrier frequency fc, a first phase shifterthat shifts a phase of a first phase signal of the resolver with a pole at a frequency flower than the carrier frequency fc, a second phase shifterthat shifts a phase of a second phase signal of the resolver with a pole at a frequency fhigher than the carrier frequency fc, and a synthesizerthat combines the phase-shifted first phase signal with the phase-shifted second phase signal.

Growing community of inventors

Tokyo, Japan

Yutaka Ono