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Viewing 1 to 30 of 394
2016-04-05
Technical Paper
2016-01-1678
Etsuo Katsuyama, Ayana Omae
Vehicles equipped with in-wheel motors (IWMs) are capable of independent control of the driving force at each wheel. These vehicles can also control the motion of the sprung mass by driving force distribution using the suspension reaction force generated by IWM drive. However, one disadvantage of IWMs is an increase in unsprung mass. This has the effect of increasing vibrations in the 4 to 8 Hz range, which is reported to be uncomfortable to vehicle occupants, thereby reducing ride comfort. This research aimed to improve ride comfort through driving force control. Skyhook damper control is a typical ride comfort control method. Although this control is generally capable of reducing vibration around the resonance frequency of the sprung mass, it also has the trade-off effect of worsening vibration in the targeted mid-frequency 4 to 8 Hz range. This research aimed to improve mid-frequency vibration by identifying the cause of this adverse effect through the equations of motion.
2016-04-05
Technical Paper
2016-01-1677
Hiroshi Himeno, Etsuo Katsuyama, Takao Kobayashi
Electric vehicles (EVs) are attracting attention due to growing awareness of environmental issues such as fossil fuel depletion and global warming. In particular, a wide range of research has examined how direct yaw moment controls (DYCs) can enhance the handling performance of EVs equipped with multiple in-wheel motors (IWMs) or the like. Recently, this research has focused on reducing energy consumption through driving force distribution control. The first report proposed a method to minimize energy consumption through an efficient DYC for extending the cruising range of a vehicle installed with four IWMs, and described the vehicle behavior with this control. Since motors allow high design flexibility, EVs can be developed with a variety of drive systems. For this reason, various driving force distribution control methods can be considered based on the adopted system.
2016-04-05
Technical Paper
2016-01-1668
Hideki Fukudome
Measures to help preserve the environment have become an essential part of vehicle development. Vehicles powered by electric motors such as hybrid and fuel-cell vehicles are an effective way of helping to reduce greenhouse gas emissions. Furthermore, in addition to environmental friendliness, motor drive allows torque to be controlled freely with high response and precision, adopting both forward and reverse rotation. As a result, motors can be used to achieve enable a high degree of controllability even for functions related to ride comfort and handling performance. In addition, in-wheel motors (IWMs), i.e., motor units that are installed inside the wheels of the vehicle, greatly increase the freedom of part layout. Consequently, IWMs have the potential to revolutionize vehicle development, including the way that vehicles are manufactured, in a way not feasible with conventional vehicle configurations.
2016-04-05
Technical Paper
2016-01-1674
Takao Kobayashi, Etsuo Katsuyama, Hideki Sugiura, Eiichi Ono, Masaki Yamamoto
Various kinds of direct yaw moment controls have been developed to enhance vehicle handling performance. Simultaneously, there have been innovations of the driving force distribution mechanism. Recently, an in-wheel motor has been proposed as the most efficient system. However, since one of the difficult issues in developing electric vehicles is to improve the mileage per charge, it is necessary to construct a new control algorithm capable of conserving and saving energy. Therefore, the purpose of this paper is to study the cornering resistance and dissipation power on tire contact patch, and to develop an efficient direct yaw moment control during acceleration and deceleration while turning. To optimize the cornering efficiency reasonably, our method to formulate the cornering resistance in steady state cornering was extended to so-called quasi steady state cornering that includes acceleration and deceleration.
2016-04-05
Technical Paper
2016-01-1185
Takahiko hasegawa, Hiroyuki Imanishi, Mitsuhiro Nada, Yoshihiro Ikogi
Toyota Motor Corporation (TMC) has been developing fuel cell (FC) system technology since 1992. In 2008 the Toyota "FCHV-adv" was released as part of a demonstration program. It established major improvements in key performance areas such as cold start/drive capability, efficiency, driving range, and durability. However, in order to facilitate the commercial widespread adoption of fuel cell vehicles (FCVs), improvements in performance and further reductions in size and cost were required. In December 2014, Toyota launched the world’s first commercially available fuel cell vehicle (FCV) the "Mirai" powered by the Toyota Fuel Cell System (TFCS). Simplicity, reliability and efficiency have been significantly improved within the TFCS. As a result, the Mirai has become an attractive vehicle which could lead the way towards full-scale popularization of FCVs. In order for a fuel cell system to generate power stably, the humidity of the electrolyte membrane must be controlled appropriately.
2016-04-05
Technical Paper
2016-01-1110
Toshinari Sano, Masashi Inoue, Fumihiro Itoigawa
In this report, for the purpose of advancing the estimation accuracy of maximum traction coefficient, we improve the temperature estimation model in the contact portion and verify it by measurement. Traction drives have been developed such as a continuously-variable transmission component for motor vehicles. The contact portion between the rolling elements mutually transmits power and always in a state in which oil film is formed. The oil film is solidified and sheared in high pressure GPa units, and also affects its own shear properties by the heat generation temperature rise. It can be said that the most important factor in estimating the traction power transmission capability is a temperature of the contact portion. The authors have already proposed the calculation method of maximum traction coefficient, in which the inside of the contact ellipse was represented by a simple combination of viscous-plastic model.
2016-04-05
Technical Paper
2016-01-1287
Kazutaka Kimura, Yuki Kudo, Akinori Sato
In recent years, in order to reduce greenhouse gasses (GHG) emission, automobile manufacturers are developing various eco-friendly cars, such as HV, PHV, REV, EV, and FCV. But there are few commercial solar vehicles in the market. One of the reasons why automobile manufacturers did not focus their attention on this area is because the benefits of installing solar modules on vehicles at the real conditions were unclear. There are two difficulties to measure the benefits of installing solar modules on vehicles: (1) Vehicles travel under various insolation conditions (2) Insolation conditions differ in each region. To address the problem, we used the combinational analysis on the basis of the internet survey of 5,000 people and the public metrological data of 48 observation points in Japan. This survey gave us the information on car conditions such as place to park, whether the car is in the sunshine or in the shade, the operating region, and the trip distance.
2016-04-05
Technical Paper
2016-01-1093
Takao Ohki, Tomoyasu Wada, Tomoyuki Kano, Tomoyoshi Ishimaru, Hideya Osawa
In late years consciousness to environmental problem increases , and the development of Fuel Economy technology becomes more and more material in commercial vehicle like passenger vehicle. We developed a new 6 speed manual transmission to contribute to Fuel Economy performance and driveability of vehicle. The Front engine Rear drive manual transmission has directly connected gear of gear ratio 1. The FR manual transmission is material factor to realize the suitable gear ratio to have directly connected gear which gear we establish in directly connected gear. This transmission enlarged gear coverage to support wide gear ratio range by adopting Double OverDrive 6MT which had fourth gear as directly connected gear. As for the total gear ratio, adjustment is possible at differential gear ratio. However, the differential ratio is connected with the torque which is in the drive train, and input torque grows big so as to do differential ratio in high gear ratio.
2016-04-05
Technical Paper
2016-01-0960
Arifumi Matsumoto, Kenji Furui, Makoto Ogiso, Toru Kidokoro
Urea selective catalytic reduction (SCR) system is a prospect technology to reduce NOx emission from the diesel engine. Besides, on board diagnosis (OBD) system is required to be equipped with such device to suppress emission from malfunctioning system. The conventional OBD methodology of SCR catalyst is conducted by measuring NOx concentration downstream of the catalyst. Though, considering future OBD regulations, the erroneous diagnosis would be occurred due to the variability in actual environment. Then, we studied new methodology to utilize NH3 slip as a new diagnosis parameter in addition to NOx to enhance OBD accuracy. NH3 slip is increased in response to the degradation of NOx reduction performance because both phenomena are based on the deterioration of the capability to absorb NH3 of SCR catalyst. Furthermore, NH3 can be measured by existing NOx sensor because NH3 is oxidized to NOx internally. To make use of NH3 slip, the estimation model of NH3 slip was developed.
2016-04-05
Technical Paper
2016-01-1192
Hisao Kato
Toyota has launched FCV, “Mirai” in last December, 2014. For future expansion of FCVs market, platinum amount per each FCV should be reduced. For this purpose, platinum degradation is one of the most important issues to be solved. We decided to precede in-situ liquid TEM (Transmission Electron Microscope) analysis to clarify platinum degradation mechanism. Due to this achievement, we believe that we could develop new materials against for degradation and design optimal FC electrode catalyst, as well as we could make a suggestion of the catalyst usage to avoid degradation in FC system. Currently we developed the in-situ TME system that prepare a similar environment with fuel cell and can observe degradation process directly, such as dissolution and agglomeration of neighboring platinum fine particles under electrochemical control.
2016-04-05
Technical Paper
2016-01-1135
Yoshitaka Shinoda, Atsushi MORI, Takeo YAMAMOTO, Takeshi Nakamura
Drive shaft is composed of transmission side joint, wheel side joint, and shaft which connect their two joints. The Rzeppa type Constant velocity joint (CVJ) is mostly selected as wheel side joint of drive shaft of front wheel drive automobiles. From recent needs of fuel efficiency and light weight for the automobiles, it is necessary to reduce joint size and improve efficiency of CVJ. In order to reduce the weight, Solving tribology subject of long life under high contact pressure is important issue for developing the CVJ. But it is difficult to understand characteristics of contact surface such as relative slip velocity or spin because all components which are composed of outer race, inner rare, cage and balls act complicatedly and exchange loads at many points. On the other hand, after joint endurance test, ball spalling mark at position of ball pole is sometimes observed.
2016-04-05
Technical Paper
2016-01-1163
Makoto Taniguchi, Takahisa Yashiro, Keiji Takizawa, Shinichi Baba, Michitaka Tsuchida, Tatsuhiko Mizutani, Hiroatsu Endo, Hiromichi Kimura
As the demand for so-called eco-cars has been increasing recently, new hybrid transaxle P610 has been developed to achieve outstanding fuel economy and an excellent driving performance. P610 was installed in the 4th generation Prius, the first car to implement TOYOTA's new development strategy, TNGA (Toyota New Global Architecture). In order to accomplish the goal, radical reduction of mechanical loss, size and weight, dual-axle motor structure are adopted to draw out the potential capability of the THS (Toyota Hybrid System) to the maximum extent possible. Furthermore, placing the compact power train low, which is realized by installed the PCU(Power Control Unit) on top of the transaxle, led to provide the low center of gravity of the vehicle and excellent driving performance.
2016-04-05
Technical Paper
2016-01-1452
Eiichiro Murata, tasuku usui, kazunori nogi, hiroyuki takahashi
The purpose of this study is to clarify the TTC (Time-to-Collision) distribution when approaching the preceding vehicle under driver’s normal operation. To improve the effectiveness of the PCS (Pre-Collision Safety), the activate timing shall be earlier. However, too early timing may interfere with the driver’s avoidance operation. If the TTC distribution can be approximated by a probability distribution, it can be used to estimate how close approach to the preceding car, and consider the setting to maximize the effectiveness of the PCS. In this study, we examine to clarify the TTC distribution using log-normal distribution.
2016-04-05
Technical Paper
2016-01-1609
Yusuke Nakae, Jun Yamamura, Hiroshi Tanaka, Tsuyoshi Yasuki
Recently, it is becoming clear that the unsteady aerodynamic forces produced due to vehicle dynamic motions affect vehicle dynamic performance attributes such as straight-line stability or handling characteristics. To improve the vehicle dynamic performances, revealing the detailed mechanisms of unsteady flow fields around vehicle in dynamic motion and their effects on vehicle dynamic performance are needed. This paper describes the numerical study of unsteady aerodynamics of a car model in dynamic pitching motion to clarify the effects of the unsteady aerodynamic forces on vehicle dynamic performances and their mechanisms. Furthermore, effects of mounting aerodynamic parts which was developed based on the analysis were also discussed. Large-Eddy simulations with ALE method were performed to simulate the transient flow fields around a car model in dynamic motion. The car model was based on a real production car and it had an engine compartment containing a radiator.
2016-04-05
Technical Paper
2016-01-1161
Akira Mori
In 2007, the research team of Massachusetts Institute of Technology succeeded in the Wireless Power Transfer (WPT) experiment of the 2m away electric bulb at 60W. Thereafter interest in WPT has been increasing. By development of WPT, they do not need to operate a cable, when the user supplies electricity to an electric appliance. Therefore, the convenience of the user will be improved. In February, 2014, we started a demonstration experiment of WPT in Toyota-city. We hope to contribute to technology development of WPT for PHVs and EVs. And, we hope to contribute to realization of the comfortable smart mobility society with low carbon dioxide. We have been developing elemental technology of WPT system (downsizing, lightweighting, flexibility improvement of the power transfer range, high efficiency, and cost reduction etc.). On the other hand, we also work on the construction of the introduction environment for WPT.
2016-04-05
Technical Paper
2016-01-0740
Kazuhisa Inagaki, Jyunichi Mizuta, Kiyomi Kawamura, Yoshinori Idota, Takeshi Hashizume
Recently, a demand for small bore-size engine installed on a compact vehicle becomes larger in terms of further reduction of CO2 emission. If the combustion process including emission formation can be generalized and be built up in a certain similarity of physical phenomena regardless engine size, it will be extremely beneficial to simplify complicated engine development process. The objective of this study is to clarify what constraints are necessary as for engine/nozzle specifications and injection conditions in order to have same combustion characteristics such as heat release rate and exhausted emissions for two different bore-size diesel engines. Firstly, ‘Geometrical similarity constrain’ was applied to the two different bore-size single cylinder engines , which have geometrically similar specification and configuration including compression ratio, bore-stroke ratio, piston cavity shape and nozzle, in order to confirm whether combustion characteristics are kept similar or not.
2016-04-05
Technical Paper
2016-01-1286
Takuya Hara, Takahiro Shiga, Kazutaka Kimura, Akinori Sato
Introducing effective technologies to reduce carbon emissions in the transport sector is a critical issue for automotive manufacturers. Plug-in electric vehicles (PEVs) are considered as one of the promising technologies, however, its effectiveness totally depends on the carbon intensity of grid electricity. PEVs using coal based electricity could end up accelerating global warming. Solar hybrid vehicle (SHV), that is equipped with photovoltaic cells on the body but no charging function, can be an alternative electric vehicle that uses off-grid, zero emission electricity. SHV has advantage also in usability because it does not need any changing, which is frequently required for PEVs and could detract the usability to hinder their penetration. This study aims at evaluating economic, environmental and usability benefits of SHV by comparing other types of vehicle, such as internal combustion engine vehicle, hybrid vehicle, plug-in hybrid vehicle (PHV) and battery electric vehicle.
2016-04-05
Technical Paper
2016-01-0658
Tomoyuki Kogo, Yoshihiko Hamamura, Koichiro Nakatani, Tadashi Toda, Akio Kawaguchi, Akira Shoji
A highly efficient new 2.8-liter inline 4-cylinder diesel engine has been developed in response to growing demand for diesel engines and to help save energy while providing high-torque performance. Engine efficiency was improved by reducing cooling loss based on an innovative combustion concept applied across the whole engine. Cooling loss was reduced by restricting in-cylinder gas flows and improving combustion chamber insulation. To prevent the restricted gas flows from affecting emissions, a new combustion chamber shape was developed that increased air utilization in the cylinder through optimizing the in-cylinder fuel distribution. Combustion chamber insulation was improved by a new insulation coat that changes the wall surface temperature in accordance with the gas temperature. This reduces cooling loss and avoids the trade-off effect of intake air heating.
2016-04-05
Technical Paper
2016-01-1319
Kimitoshi Tsuji, Katsuhiko Yamamoto
It is important for vehicle concept planning to estimate fuel economy and the influence of vehicle vibration in advance using virtual engine specifications and a virtual vehicle frame. In our former study, we showed the 1D physical power plant model with electrical starter, battery that can predict combustion transient torque, combustion heat energy and fuel efficiency. The simulated result agreed with measured data. For idling stop system, the noise and vibration during start up is important factor for salability of the vehicle. In this paper as an application of the 1D physical power plant model, we will show the result of analysis that is starter shaft resonance and the effect on the engine mount vibration of restarting from idle stop. The power plant was 3.5L 6cyl NA. The power plant model was realized by energy based model using VHDL-AMS. Here, VHDL-AMS is modelling language stored in IEC international standard (IEC61691-6) and can realize multi physics on 1D simulation.
2016-04-05
Technical Paper
2016-01-1210
Koji Shiozaki, Ken Toshiyuki, Jae Seung Lee, Kyosuke Miyagi, Adam Barkley, Zach Cole, Brandon Passmore, Ty McNutt, Alex Lostetter
An increasing focus on energy security is sparking a search for alternative energy sources and higher fuel efficient vehicles, and the HV/PHV/EV market is rapidly expanding. The on-board battery charger is a key component for PHV/EV. SiC is one of the most promising alternatives to Si due to its superior material characteristics such as lower on-state resistance, higher junction temperature, and higher switching frequency. High frequency SiC power device is a technical breakthrough opening the way to development of a novel compact on-board charger. The selection criteria of converter architecture are based on simplicity, high densification of power circuit, and high temperature applicability. A topology of the battery charger is a conventional two-stage converter that comprises of a bridgeless boost AC-DC power factor correction (PFC) converter and a phase-shifted full-bridge (PSFB) isolated DC-DC converter.
2016-04-05
Technical Paper
2016-01-0529
Michitaro Itoga, Shigetaka Hamada, Seiji Mizuno, Hiroaki Nishiumi, Kazuya Murata, Toshiyuki Tonuma
We aimed at the realization of the vehicle which had clean and fun to drive by achieving high cornering performance and the superior operation stability in the floor lower deployment. Securing of reliability for high efficiency of the FC stack, build reduction by the downsizing and input peculiar to a floor bottom is necessary for the floor lower deployment. The new FC stack achieves a power density of 3.1 kW/L and 2.0 kW/kg (one of the highest in the world). These figures are more than twice as high as the previous model and allow the FC stack to be installed under the floor of the new FCV. We carried out three measures to be equipped with new stack under a floor. The first measures of the low vibration and impact input at the time of road surface interference and the light collision, We prevented cell lamination deviation with the friction constraint structer.
2016-04-05
Technical Paper
2016-01-0500
Akira Kato, Masayuki Takano, Kohei Hase, Satoko inuzuka, Toshiyuki dobashi, Tsuyoshi Sugimoto, Nobuaki Takazawa
HV power semiconductor modules convert direct current (DC) and alternating current (AC) via power semiconductor chip switching. Since the power semiconductor chip generates heat by energization, heat dissipation is required in the power semiconductor module. There are several types of power semiconductor structures. The power card structure is selected because of its effective heat radiation performance. The power card consists of molding resin and devices soldered to a lead frame. The molding resin provides a barrier against contamination and prevents thermal strain in the solder. Good adhesion between the molding resin and the lead frame is therefore very important. Primer is used between the molding resin and the lead frame to ensure optimum adhesion. As power cards become increasingly compact, devices are operated at higher temperatures and there is a greater need to provide improved adhesion strength between the interfaces at high temperatures.
2016-04-05
Technical Paper
2016-01-0034
Shunsuke Kobuna, Tomoyuki Kaga, Tomoya Yamaguchi
As automobile control software is becoming larger and more complex, it is increasingly important to improve efficiency of software development process to offer better products. Model-based development has become popular and as one of the benefits, we can execute a variety of test data easier than actual vehicle test to validate specification of software. But there is room for improvement because designers usually have to come up with test data set which requires significant man-hours. In order to increase efficiency of validation process, we focus on search-based testing technology which can generate dynamic test data automatically. Search-based testing uses optimization technique. It quantifies dynamic behavior by using temporal logic as objective function and modifies test input data repeatedly until the value of objective function violate criteria to regard as specified behavior happened.
2016-04-05
Technical Paper
2016-01-1155
Toru Nakamura, Takahiro Misawa, Yusuke Futakuchi, Kensuke Kamichi
In February 2014, Toyota started wireless charging verification test. The purpose of this test is to clarify the difference of convenience between the AC cable charging and WPT (Wireless Power Transfer) system, and the problem of installation of the infrastructure system. The test system was installed at the home parking lot of the users and they used this system in everyday life. For this test, we built the test vehicles and the infrastructure systems. The test vehicle was based on Prius PHV and attached WPT system. This system used magnetic resonance system to secure robustness of the gap between primary and secondary coil, and X-Y position. The output power was 2kW and charging time was about 1.5 hr. This specification was similar to AC cable charging system of base vehicle. The infrastructure system included the power station and the primary coil. This system was driven at 85 kHz considering standardization.
2016-04-05
Technical Paper
2016-01-1521
Masaaki Kuwahara, Tsuyoshi Yasuki, Takeki Tanoue, Ryosuke Chikazawa
This paper describes bio-fidelity of ATDs including Hybrid Ⅲ and THOR in oblique frontal impact test. Kinematics and injury values of FE models of the ATDs were compared with those of human FE model (THUMS). Sled simulations of mid-size sedan with FE models of the ATDs and THUMS were performed. Kinematic of THOR was close to that of THUMS, while that of Hybrid Ⅲ was different from that of THUMS. THOR and THUMS indicated rotation rib cage around z axis due to twisting of lumber spine, white Hybrid Ⅲindicated insignificant rotation of rib cage. Lateral movement of head of THOR and THUMS were mostly caused by twisting of lumber spine around z axis, head of THOR and THUMS contacted door trim or instrument panel, and caused high HIC number. Lateral movement of head of Hybrid Ⅲ was less than those of THOR and THUMS and did not contact the door trip and did not cause high HIC numbers.
2016-04-05
Technical Paper
2016-01-1417
Toshinao Fukui, Kazuhiko Nakamoto, Hiroyuki Satake
Recently, head up displays (HUD) have become a common visual feedback device of advanced technologies as the HUD can display feedback to the driver in a highly visible area. However, a reflection to front windshield is often caused by the outline (mikiri line) of the HUD unit on the dash board when the dash board is in direct sun light. The reflection can lead to driver annoyance on an asphalt road as well as dark view in front of windshield. In certain conditions of the front view, location and thickness, and contrast of the outlines were considered as factors impacting annoyance. These factors were considered to contribute to the visibility of stripe pattern (a contrast sensitivity function). In addition, since the reflection of the outlines can be enhanced by bright sunlight coming to the dash board, the present study considered high illuminance on the dash board as an environmental factor. This additional factor was not considered in the past study.
2016-04-05
Technical Paper
2016-01-1355
Jeffrey R. Hodgkins, Walter Brophy, Thomas Gaydosh, Norimasa Kobayashi, Hiroo Yamaoka
Current CAE (computer aided engineering) methods used to develop vehicle interior noise performances have always had the reputation for being inaccurate in predicting acoustic behavior in the mid-frequency range (300 to 1000 Hz). It is in this frequency range where the overall acoustic performance becomes sensitive to not only the contributions of structure-borne noise components, which CAE has proven capable of predicting, but also the growing contributions of air-borne noise components, where CAE usually lacks the capability to accurately reflect the physics involved in complex vibro-acoustic systems. This paper will discuss a study that was undertaken to test the capability of a finite element modeling method that can accurately simulate air-borne noise phenomena in the mid-frequency range. This modeling method was used to create a model of an enclosed simple box-shaped vibro-acoustic system fit with various acoustic trim parts (carpet and under body covers).
2016-04-05
Technical Paper
2016-01-1412
Takeshi Hamaguchi, Satoshi Inoue, Shigeyuki Kimura, Terumasa Endo
In general, driver workload can be measured with questionnaires or other subjective methods for human-centered design. Many researchers have studied how subjective ratings of workload have good correspondence to physiological and/or behavioral, psychological measures. On the other hand, a model of driver behavior can be more informative because it allows researchers to estimate how drivers actually control the vehicle. Behavioral measures can be used to understand the interaction between a driver’s perception of information and his/her choice of action. Previously, pedal control was used for identifying specific individual habits or evaluating acceptability for a wide variety of driving assistance systems. Pedal behavior has not been modeled to estimate driver workload.
2016-04-05
Technical Paper
2016-01-0411
Yosuke Akita, Kenji Abe, Yoshitsugu Goto, Yuji Nagasawa, Satoshi Wakamatsu, Noboru Sugiura, Kyoko Kosaka, Yoshihiro Osawa
The coefficient of friction between disc rotor and pad often increases under wet condition, and the increase of the coefficient of friction may causes the brake noise. In this paper, in order to clarify the cause of the coefficient of friction variation with Moisture between friction surfaces, the in-situ observation is performed using a glass rotor. Survey test of the frictional surface observation is performed under dry condition using two kinds of pad which varied in a wear type and the pad which is suitable for frictional surface observation is selected. The observation results with moisture between friction surface using selected pad showed that wet wear debris on the friction surfaces affected the μ variation.
2016-04-05
Technical Paper
2016-01-1230
Takaoki Ogawa, Atsushi Tanida, Toshifumi Yamakawa, Masaki Okamura
The physical property of silicon power semiconductor is approaching limit of material. That is used for motor control of electric motor car, which is Hybrid Vehicle (HV) and Plug-in Hybrid Vehicle (PHV), Fuel Cell Vehicle (FCV) and so on. With the aim of real practical use after 2020, new material power semiconductor Silicon Carbide (SiC) is being developed. That is expected as a key technology for further improving fuel efficiency for electric motor car. We made power control unit (PCU) that adopted the Silicon Carbide (SiC) power semiconductor experimentally this time. SiC power semiconductors have low power loss caused by low conduction loss and low switching loss when switching on and off as described in our papers. We evaluated the power semiconductors temperature at which the boost converter was operated continuously. The switching frequency was 10 kHz and 20 kHz.
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