IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 120, Issue 10
Displaying 1-21 of 21 articles from this issue
  • Tatsuya Suzuki, Shigeru Okuma
    2000 Volume 120 Issue 10 Pages 1105-1110
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
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  • Kiyoshi Mizui
    2000 Volume 120 Issue 10 Pages 1111-1117
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    In recent years, the development of ITS (Intelligent Transport Systems) is promoted. In many systems for ITS, vehicle-to-vehicle communication systems and ranging systems are very important. A vehicle can automatically get the information of surrounding vehicles by vehicle-to-vehicle communication systems. And it can measure distances among their vehicles by ranging systems. It is inefficient from the view of economy and effective use of transmission medium that a vehicle has two systems separately. Therefore, Vehicle-to-Vehicle Communication and Ranging System using Spread Spectrum Technique called Spread Spectrum (SS) Boomerang Transmission System has been proposed. In this system, a vehicle (Vehicle-A) transmits its PN code to another vehicle (Vehicle-B). Vehicle-B replies the PN code adding its information. And Vehicle-A gets the information of Vehicle-B and the distance between vehicles. However, this system cannot measure the location of Vehicle-B because each vehicle has one pair of receiver and transmitter. In this paper, we propose Vehicle-to-Vehicle Communication and Location System using SS Technique. In the proposed system, Vehicle-A has two receivers on each side of it. And the received signals of Vehicle-A have the phase difference related to position of Vehicle-B. So, Vehicle-A cannot get only the information of Vehicle-B and the distance between vehicles but also the location of Vehicle-B.
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  • Yu Endo, Hisao Koizumi, Katsuhiko Seo
    2000 Volume 120 Issue 10 Pages 1118-1126
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    In this article, a hardware and software co-design method for the image processing system of Intelligent Transport System (ITS) is proposed. The objective of this method is to optimize the division of functions between hardware and software by the optimum trade-off. Under this method, first, the targeted overall system is modeled by software to adjust functions and structures of the system. Then, the performance of each function of software and hardware in the model is evaluated by simulation, and the optimized division of functions between hardware and software is eventually obtained. Each function divided in hardware and software is designed in detail using development tools and then the results of the design of hardware and software are loaded on the co-design test board to verify and evaluate satisfaction in the design objectives. The ITS image processing development area is chosen as an application example for this method and its effectiveness is verified by evaluating the construction of a safe driving support system.
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  • Hiroshi TAKAHASHI, Kouichi KURODA, Hiroshi SATOU
    2000 Volume 120 Issue 10 Pages 1127-1133
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    This paper proposes an approach to design an intelligent vehicle controller for partially supporting the driver's operation of a vehicle. Driving can be thought of as a system formed by the interaction between the driving environment, vehicle behavior and the driver's expectations for vehicle behavior. In this system, information on the road environment is paid a lot of attention in our work. Driver's intention to decelerate during driving operation comes mainly from information on former road environment that the driver percepts. New power-train control method that takes information on road curves into account is proposed. In this system, the data of former road curvature are predicted by calculating navigation map data.
    As a simple case study, the road situation that have straight road and curve road is dealt with in this paper. Driver's mental model for driving straight road in front of curve road is identified by an inductive analysis using experimental data. This mental model is installed to real experimental vehicle. As an example, a control procedure designed with the proposed model is applied to power train control. The experimental results show good performance in the vehicle control system.
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  • Zhencheng Hu, Keiichi Uchimura
    2000 Volume 120 Issue 10 Pages 1134-1142
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Motion detection from a moving observer has been a very important technique for 3D dynamical image analysis. Because of the continuous background changing, detecting the real moving objects has become very difficult and always employs optical flow method to measure the flow vectors difference between background and the moving objects. Unfortunately, it has to pay a huge calculation cost to obtain the accurate optical flow vectors. A new motion detecting method based on camera 3D-motion analysis is proposed in this paper. With the special motion feature of on-board camera and FOE, our method can detect the real moving objects by simply using the matching between two adjacent frames. The camera 3D-motion can theoretically be determined in our method with only three matching pairs, which make it fast and more efficient for real-time applications. The output moving object candidates are simultaneously tracked over time in consideration of tracking cycle and estimation of their reliability and vitality degree. Experiments on plenty of real outdoor road scenes show the accuracy and efficiency of our approach.
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  • Amano Naoki, Hashimoto Hiroshi, Higashiguchi Minoru, Kimura Yukio
    2000 Volume 120 Issue 10 Pages 1143-1149
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    In this paper, we propose a method to detect moving obstacles from image data be given from two cameras on the moving vehicle. The moving vehicle is equipped with two cameras for quick detection of moving objects. One (is called fixed camera) is fixed on the front part of the vehicle, and the other (is called movable camera) is able to move within the deck of the vehicle. In this system, the position of the movable camera traces that of the fixed camera. Using this system, it is able to detect moving objects quickly as the vehicle moving.
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  • Hirofumi Matsuo, Yoichi Ishizuka, Katsuji Iida, Takeshi Sakuma
    2000 Volume 120 Issue 10 Pages 1150-1156
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Recently, the soft-switching techniques have been gradually introduced into dc-ac inverters and dc-dc converters. The resonance phenomena generated by the inductor and capacitor are usually employed to achieve the soft-switching of main power switches and diodes in these power conversion circuits. In this paper, the novel test equipment for resonant circuits is proposed and analysed, which enables us to examine the perfor-mance characteristics of the inductor and capacitor in the high voltage resonant circuit by using the relatively low voltage power supply.
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  • Hiroshi Fujimoto, Yoichi Hori, Shinsuke Nakagawa, Shisuke Nakagawa
    2000 Volume 120 Issue 10 Pages 1157-1164
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    In this paper, novel multirate two-degree-of-freedom controllers are proposed for digital control systems, where it is restricted that the speed of the A/D converters are slower than that of the D/A converters. The proposed feedforward controller assures the perfect tracking at M inter-sampling points. Next, the proposed method is extended to systems with time delay. The proposed scheme is applied to the seeking control for hard disk drive, and advantages of this approach are demonstrated.
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  • Hasan Zidan, Shuichi Fujii, Tsuyoshi Hanamoto, Teruo Tsuji
    2000 Volume 120 Issue 10 Pages 1165-1170
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    This paper demonstrates a new and simple speed estimation method for the induction motor (IM) drives at low speeds. This method uses the current and the input voltage in a closed loop for rotor parameter estimation. In this method, a digital system expression is considered where we assume that the rotor flux and the rotating speed are constant during a short sampling period. Simulation and experimental results demonstrate the validity of the proposed estimation algorithm for practical applications.
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  • Katsutaka Tsuboi, Mineo Tsuji, Eiji Yamada
    2000 Volume 120 Issue 10 Pages 1171-1181
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Unstable phenomena of propulsion converters with input LC filter for railway vehicles have been already reported and these solutions were proposed in some applications. However, there are many other systems and circuit topologies for vehicles. In these systems, each peculiar solution is needed. On the other hand, in recent years, series line resistor, which limits short-circuit current and compensates interrupting capacity of line breaker, is not required to have so large resistance with the technical development of breaker apparatus. However the resistor contributed not only to assist interruption but also to suppress unstable phenomena. Therefore unstable phenomena caused by smaller resistance becomes more conceivable, and other solutions and its analysis are more eagerly needed now. In this paper, this unstable phenomena of chopper-inverter system for air conditioner are analyzed by using root locus method. It is shown that cooperative response regulation of controllers or supplement of proper dumping circuit is effective to stabilize the system. The validity of these solutions is confirmed through non-linear circuit simulations.
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  • Yoshinori MATSUZAKI, Ozawa Shinji
    2000 Volume 120 Issue 10 Pages 1182-1188
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    In this paper using an image shot by single camera located at the side of road, we proposed a method to recognize the shape of a vehicle and classify the type of that vehicle.
    Primarily it is impossible to reconstruct the shape of a vehicle from single image. Therefore proposed method makes it come true with information that the shape of the rear has kind of symmetrical. And the method classifies vehicles using template matching based the tilt of recognizable data of cross section.
    Experimental results with simulation images and real images show that proposed system is efficient.
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  • Kazuyoshi Hitosugi, Shoji Moriyasu, Noriyuki Nanba
    2000 Volume 120 Issue 10 Pages 1189-1197
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    The use of PWM-inverter with high switching characteristics for the adjustable speed drive system causes the overvoltage with steep-fronted waveform on the motor terminals. As this steep-fronted transient voltage in inverter drive burdens heavily on the terminal coils of motor winding, the insulation failure in the motor winding occures mostly on the terminal coils. On this reasons, it is reasonable that the dielectric strength of interturn insulation is increased only on the terminal coils by reducing turns of the terminal coils.
    This paper states about the equivalent circuit taking the space harmonic into account and the starting and operating characteristics of the induction motor with reduced turns of the terminal coils.
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  • Mika Morii, Hiroyuki Yasuo, Takao Kashihara, Takeshi Iwamoto, Mitsuo S ...
    2000 Volume 120 Issue 10 Pages 1198-1204
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Understanding of vehicle driving environments is necessary for safe and smooth transportation. The road surface condition is one of the most important factors. We have developed a road surface condition detector using high peak power fiber laser with peak power of 200W. The laser beam is a pencil beam and the detector can discriminate the longitudinal (traffic stream directions) conditions by laser beam scanning. The measuring area of this detector is about ±50m and spatial resolution is about 5m. The detecting accuracy of three conditions (dry, wet and snow & ice conditions) is more than 98%
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  • Hirohito Funato, Kenzo Kamiyama, Atsuo Kawamura
    2000 Volume 120 Issue 10 Pages 1205-1211
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Rapid power flow control of power systems is the key concept of Flexible AC Transmission System (FACTS). The power flow is essentially restricted by a line inductance. The authors have previously proposed the Variable Active Passive Reactance (VAPAR)(1) which can generate a virtual variable inductance. In this paper, a new instantaneous power flow control method using variable inductance is proposed. The theoretical analysis shows that the power flow follows in inverse ratio of the line inductance even in a transient state assuming the simple power system with two voltage bus connected by an inductive power line. Simulations and experiments were carried out using the feedfoward-based power controller to verify the effectiveness of this method. Then, the characteristics of the power control were analyzed for different line impedances by simulations. The results show that the power flow can be quickly controlled using variable inductance in the case of a small line resistance, while transient oscillations are observed in the power flow only when a line resistance is rather large.
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  • Tadashi Fukami, Nobuyuki Naoe, Toshio Miyamoto
    2000 Volume 120 Issue 10 Pages 1212-1219
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    This paper presents a new structure of a self-regulated, self-excited, single-phase induction generator. The generator has two sets of electrically isolated stator windings, a single-phase main winding and a three-phase auxiliary winding. It employs a standard squirrel-cage rotor. The three-shunt capacitors are connected across the auxiliary winding, while a single-phase load is connected across the main winding in series with a series capacitor. For analysis and design of this new generator, an equivalent circuit is derived using the method of symmetrical coordinates. Based on the equivalent circuit, the steady-state performance of the generator is theoretically calculated, and the results are verified through experiments. In addition to a self-regulating feature, the proposed generator has the advantage of balanced three-phase excitation.
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  • Masaharu Minami, Shigeo Nagaya, Hiroshi Kawashima
    2000 Volume 120 Issue 10 Pages 1220-1224
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    As the high temperature superconducting magnetic bearing has the characteristics of low loss, research and developments of the flywheel with this bearing have been executed for energy storage system. This bearing has been planned to be used for the thrust bearing of CFRP flywheel, having the characteristics of high mechanical strength and a low specific weight. The verification tests have been performed of the maximum energy storage of 1.4kWh at 20, 000rpm.
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  • Li Ding, Hidehiko Sugimoto
    2000 Volume 120 Issue 10 Pages 1225-1234
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    In this paper, the stability of vector controlled induction motor system without speed sensor driven with controlled voltage source using adaptive secondary flux observer (CVSS) is analyzed, and the improving method is proposed.
    First, the stability of the system including the estimators of the primary resistance and motor rotational speed on the conventional method for already reporting is clarified in the equilibrium points vicinity. As the result, it was proved that the stability of the conventional method was worse than the stability of vector controlled induction motor system without speed sensor driven with controlled current source using adaptive secondary flux observer(CISS), because the primary voltages of induction motor and those of observer are different in conventional method. Next, a new CVSS is proposed, in which the primary voltages applied to induction motor is equal to those applied to observer. The stability of new system is clarified, and it is better than the stability of the conventional method. Furthermore, it is clarified that the stability is the same as CISS, which is applied practically. In addition, the unstable regions is clarified by the mathematical expressions under the regenerating condition.
    The appropriateness of investigation results are confirmed by the simulations.
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  • Keiichi Morishita, Michio Hamana, Takashi Maeda
    2000 Volume 120 Issue 10 Pages 1235-1236
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Electronic Toll Collection (ETC) System is under preparation in order to start the service this year. It is the most important for ETC System to establish the high reliability because of handling the electronic money information. Fast frequency switching is very effective to realize the high communication reliability since sufficient communication time can be secured. We have developed the Microwave Hybrid Module (MHM) for On-Board Equipment (OBE). The MHM provides the high speed switching circuit, and the 100us of switching time was examined. Furthermore, the MHM is suitable for the downsizing and the cost reduction of OBE.
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  • Nobuyuki Kasa, Takahiko Iida, Hideo Iwamoto
    2000 Volume 120 Issue 10 Pages 1237-1238
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    This paper presents a newly developed transformer-less single phase inverter for a photovoltaic (PV) power system. The proposed system consists of two sets of a PV array and Buck-Boost type chopper circuit. A transformer and a inductor which links to a utility grid line are not necessary for the system. The swiching pulses are generated by all digital circuits included a DSP. The experimental data shows that this new inverter can supply the AC power to utility grid line with the power factor nearly unity.
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  • Y. L. Feng, Y. Konishi, M. Nakaoka
    2000 Volume 120 Issue 10 Pages 1239-1240
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    In this paper, a current-source parallel inductor-compensated load-resonant high-frequency soft switching inverter with a single switched capacitor resonant snubber in DC side for driving the silent discharge ozone generating tube is presented, together with its unique output power regulation characteristics in transient state and steady-state.
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  • Design Method of Torque Control Sysytems usign Identified Model
    Seiji Hashimoto, Hirohito Funato, Imanari Yutaka, Kenzo Kamiyama
    2000 Volume 120 Issue 10 Pages 1241-1242
    Published: October 01, 2000
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    This paper introduces how to identify the parameters of the general equivalent circuit of induction motors. This method is implemented by using the system identification while no induction motor operates. The results have been compared with other results obtained experimentally by a conventional method.
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