Hitachi Automotive Systems, Ltd.

Hitachi, Ltd.

Hitachi Astemo Ltd.

Kazuto Oyama

Katsuhiro Hoshino

Hideki Miyazaki

Kenichi Yoshida

Takafumi Hara

Takeshi Yoshida

Minoru Ikeda

Noriyuki Kumasaka

Yasuhiro Yoshimura

Toshiyuki Ajima

Yoshishige Endo

Katsutoshi Nii

Yoshiaki Yamauchi

Yoshihiro Iwama

Akira Kojima

Tokihito Suwa

Hisaya Shimizu

Kazuo Sakai

Masaru Yamasaki

Kohei Myoen

Hisahiro Miki

Toshisada Mitsui

Yasuhiro Nemoto

Hideharu Ono

Akihiro Ashida

Tomoki Hirata

Yosuke Umesaki

Shingo Nishiguchi

Taizou Miyazaki

Hirokazu Sambonsuge

Yoshihiro Satou

The invention is directed to modeling of heat and vibration for structures. Therefore, with a traditional model division for each component, one-to-one correspondence between the models and the components is not necessarily realized. There has been a problem in that it is difficult to divide the models. To solve the above problem, a simulation program according to the present invention includes a first model for calculating a first vehicle characteristics parameter, a second model for calculating a second vehicle characteristics parameter to transfer energy without converting the energy, and an interface model for performing conversion calculation of the first vehicle characteristics parameter and the second vehicle characteristics parameter.

Simulation program

This is to reduce electromagnetic noise while reducing a calculation load of a microcomputer. An inverter drive device according to the present invention switches a first control mode, a second control mode, and a third control mode on the basis of vehicle speed information in a motor control device that controls a power converter that drives a polyphase motor by a PWM pulse signal based on a carrier signal, the first control mode being for updating a command voltage signal to the power converter only on a ridge side or a trough side of the carrier signal, the second control mode being for updating a command voltage signal to the power converter both on a ridge side and a trough side of the carrier signal, and the third control mode being for updating a command voltage signal to the power converter only once of ridge-trough-ridge or trough-ridge-trough of the carrier signal.

Inverter drive device and electrically driven vehicle system using the same

A control device and a control method for a rotary electric motor, and a rotary electric motor drive system capable of reliably suppressing vibration of the rotary electric motor are provided. A rotary electric motor is controlled by PWM at a predetermined carrier frequency, and in a case where a vibration frequency in a space zero-order eigenmode of the rotary electric motor and a frequency of a frequency component of electromagnetic exciting force that generates the eigenmode overlap with each other, a value of the carrier frequency is switched from a first value to a second value different from the first value.

Control method and control device for rotary electric motor, and rotary electric motor drive system

A motor is driven while suppressing drive torque ripple generated by the motor, when any of the phases is opened during the driving of the motor. A motor drive device controls the driving of a motor in which the armature windings of respective phases are independently provided. The motor drive device is equipped with: an inverter circuit for converting the DC power supplied through DC bus lines to three-phase AC powers and respectively outputting the three-phase AC powers to the armature windings of the respective phases; and a controller for controlling the inverter circuit. When any of the phases is opened in the AC powers output from the inverter circuit, the controller adjusts the difference between the phases of the respective currents flowing through the armature windings of normal phases so that the AC powers of the other normal phases except the opened phase are compensated each other.

Motor drive device

The occurrence of torque in the motor due to an unintentional flow of the q-axis current in the motor during discharging of the smoothing capacitor is reduced. A motor control device according to the present invention controls a system including an inverter including a smoothing capacitor connected to a power source via a relay, a motor connected to the inverter, and a current sensor configured to detect a current flowing through the motor, the motor control device including: an electric discharge control unit configured to discharge, in the motor via the inverter, an electric charge accumulated in the smoothing capacitor; and a current sensor calibration unit configured to calibrate the current sensor in a state where no current in the motor flows during a time period from when the relay is cut off to when discharge control by the electric discharge control unit is started, wherein the electric discharge control unit performs discharge by controlling the current in the motor based on a value of the current sensor calibrated by the current sensor calibration unit.

Motor control device

In order to provide an electric vehicle drive system capable of promoting improvement in stability of vehicle traveling when stopping a regeneration operation during operation of a regeneration cooperative brake, the electric vehicle drive system, a battery control unit, upon detecting that a battery state is an unchargeable state during control of the regeneration cooperative brake, diagnoses whether a batteryis chargeable, and upon deciding to be unchargeable from a result of diagnosis, outputs a Fail signal. Then, a rotating electrical machine control unit, upon receiving a Fail prediction signal while the regeneration cooperative brake is being controlled, executes loss increase control for increasing an internal loss of a rotating electrical machineand reducing regenerative electric power by a regenerative brake while maintaining torque of the rotating electrical machineat regenerative torque corresponding to regenerative brake force.

Electric vehicle drive system

Video camera with digital video disk player

A disk drive is realized, which omits running-in for stabilizing a change in a correcting function produced by sliding between balls and a rolling groove in an unbalance correcting mechanism, and prevents immobility and straying of balls, and which comprises a unit mechanism assembled by using 12 balls subjected to surface treatment with heptadecafluorodecyltrimethoxysilane and a turntable plated with a chemical nickel plating containing phosphorus and boron to have a thickness of 5 &mgr;m and by injecting 1 microliter of ester oil into the rolling groove, and further comprises a recess formed in a sidewall of the rolling groove of the unbalance correcting mechanism to prolong the service life of the correcting function.

Disk drive with unbalance correcting mechanism

A magnetic recording/reproducing apparatus includes a head for performing recording/reproducing, a chassis for positioning the head, a cassette holder for positioning a cassette on the chassis, the cassette including an opening portion through which a recording medium is received or drawn out, a cassette holder supporting member for supporting the cassette holder on the chassis, and a casing which contains these component parts. The cassette holder supporting member has a substantially U-shape, facing three side surfaces of the cassette except the opening portion, and includes integrally formed fastening portions to be secured on the casing. The cassette holder supporting member is fastened to the casing through two fastening portions, and the chassis is directly fastened to the casing in one portion of the chassis.

Cassette holder mechanism for magnetic recording/reproducing apparatus

Growing community of inventors

Hitachinaka, Japan

Kazuto Oyama