Fujitsu Corporation

Fujitsu Media Devices Limited

Transtron Inc.

Arata Ejiri

Tsugito Maruyama

Hiroyuki Suzuki

Yutaka Nakamura

Mitsuhiko Ohta

Hiroshi Ishikawa

Yoshio Satoh

Yasuo Noguchi

Hiroshi Tanaka

Kazutaka Ogihara

Jun Sasaki

Tsutomu Miyashita

Takahiro Imamura

Riichiro Take

Atsuo Iida

Toru Yokohata

Ichiro Watanabe

Hitoshi Komoriya

Takao Hirahara

Tsuguto Maruyama

Seiji Toda

Ken-ichi Itoh

A dynamic feedforward amount to realize a predetermined transient response characteristic by compensating a transient response characteristic of an engine having a Variable Nozzle Turbo (VNT) and an Exhaust Gas Recirculator (EGR) is calculated for a nozzle opening degree of the VNT and a valve opening degree of the EGR. The transient response characteristic of the engine responds to a setting value of an injection quantity or the like. Then, command values of the nozzle opening degree of the VNT and the valve opening degree of the EGR are calculated by using the dynamic feedforward amount. In the transient state, the followingness to the target value is improved.

Engine control apparatus and method

By using a model of a transient response characteristic of an engine and a model of a steady-state characteristic of the engine, a disturbance estimate value is calculated. By using this disturbance estimate value, initial command values of a nozzle opening degree of a Variable Nozzle Turbo and a valve opening degree of a Exhaust Gas Recirculator are adjusted in order to reduce model errors and appropriately handle the disturbance. Hence, it is possible to cause Mass Air Flow and Manifold Air Pressure to follow their target values stably.

Setting values of a fuel injection quantity for an engine having an exhaust gas recirculator (EGR) and variable nozzle turbo (VNT), and an engine speed, and measurement values of a manifold air pressure (MAP) and a mass air flow (MAF) are obtained. According to a combination of the reference values of an EGR valve opening degree and a VNT nozzle opening degree, which correspond to the setting values, or a combination of a control value of the EGR valve opening degree by a MAF controller and a control value of the VNT nozzle opening degree by a MAP controller, which correspond to the measurement values, a mode that the MAF and MAP controllers, a first interference compensator from the MAF controller to the MAP controller and a second interference compensator for the reverse direction are enabled and a mode that the MAF or MAP controller is enable are dynamically switched.

Engine control program, method and apparatus

A controller updates a partition arrangement table and a backup-disk management table. The controller also creates, in a first disk, a logical memory area for storing a backup directory that has been stored in the first disk and that corresponds to a primary directory stored in a second disk of a processing element in which a failure has occurred.

Storage control apparatus, storage control method, and computer product

The present invention relates to a system capable of carrying out efficient and stable system operation control even if a usage rate of the entire system varies under a situation in which the characteristics of storage units, such as maximum available total capacity and speed performance, are largely different from each other. Therefore, the system according to the present invention is composed of a monitor unit for monitoring information on a total volume of data stored in each of the storage units or in all the storage units, an index value calculating unit for calculating an index value on the basis of the monitor result and a location unit for distributively locating or relocating logical storage areas in physical storage areas on a plurality of storage units on the basis of the calculated index value.

Migrating data in a distributed storage system based on storage capacity utilization

A bad sector is detected by activating a bad sector detecting function of a recording apparatus at a predetermined interval. The bad sector is recovered, when the bad sector is detected at the detecting, by overwriting data on the bad sector with a duplication of the data, and when overwriting fails, by writing the duplication of the data on other sector.

Failure recovering method and recording apparatus

A head is moved in a lateral direction on the boundary between a separation track and a recording track on a recording medium. The separation track isolates the adjacent recording tracks from each other. A variation is detected in the output supplied from the head based on the recording track. Positional information indicating the position of the head is generated based on the variation. The output supplied from the head varies in response to the movement in the lateral direction, namely the elapsed time. The positional information can thus be generated based on the variation in the output. The generated positional information contributes to an accurate positioning in a facilitated manner. Moreover, information required to position the head can be omitted from the recording medium. The processes can be simplified in the production of the recording medium. The operation time can thus be shortened.

Method of detecting position of head for recording medium

A magnetic pattern transfer method is disclosed. A magnetic pattern transfer master having a plurality of magnetic portions preformed with predetermined magnetic patterns is brought in proximity to a magnetic recording medium having a magnetic film to record the magnetic information, and a magnetic field is applied from an external source thereby to transfer the magnetic patterns to the magnetic recording medium. In order to improve the closeness between the magnetic film of the magnetic recording medium and the magnetic portions of the magnetic pattern transfer master, the magnetic patterns are transferred to the magnetic film of the magnetic recording medium during the process of fabricating the magnetic recording medium. Also, using a magnetic pattern transfer master with the width of each pattern groove of the magnetic patterns smaller than the width of a corresponding pattern protrusion, the relative position of the magnetic pattern transfer master is displaced, while at the same time transferring the magnetic patterns to the magnetic film of the magnetic recording medium a plurality of times.

Magnetic pattern transfer method

A disk drive apparatus that performs a positioning of a head based on servo information recorded on a recording medium includes a servo control unit that performs a servo control based on a set of pieces of servo information selected from a plurality of sets of pieces of servo information recorded on the recording medium.

Disk drive apparatus, servo control circuit, method of manufacturing recording medium, magnetic recording medium, and method of checking recording medium

A magnetic head supporting mechanism includes a fixing member, a piezoelectric element supported by the fixing member, and a head supporting member provided on the piezoelectric element, a magnetic head being supported by the head supporting member. An acceleration sensor is formed by the head supporting member and the piezoelectric element so as to be incorporated into the mechanism.

Magnetic head supporting and positioning control mechanism

In an automatic wiring connection apparatus, position detection marks 221; 231 are disposed on matrix boards 220; 230, respectively, as shown in FIG. 8. Position data of a desired crosspoint hole included in anyone of areas 227.sub.-- 1, . . . , 227.sub.-- 5; 237.sub.-- 1, . . . , 237.sub.-- 4 as assembly of crosspoint holes is corrected in accordance with a difference between design values of the position detection marks 221; 231 and measured values. A pin insertion and pulling out robot is operated in accordance with the corrected position data.

Growing community of inventors

Kawasaki, Japan

Arata Ejiri