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9731316 Electronic control system of the dry hybrid belt CVT
90
Abstracts / JSAE Review 19 (1998) 89-109
The dry hybrid belt CVT(A •CVT) has attained high transmissibility by reducing transmission loss compared with an oil pressure system by using a dry hybrid belt, electric magnetic powder clutch and DC motor. The fuel consumption of a vehicle equipped with the A. CVT has proven superior to a manual transmission. This paper reports on the analysis of transmission loss. 9731334 Battery State-of-Charge Indicator for Electric Vehicle Junichi Iino, Tetsuya Kobayashi DENSO Corporation) In order to detect a state-of-charge of EVs at high accuracy, residual energy of the battery was measured in units of watt-hour and its level was defined as 0% when the vehicle can no longer travel. This indicator estimates the terminal voltage at the constant power discharge, from the instantaneous terminal voltage and current of the vehicle, and obtains the residual energy by referring to the constant power discharge voltage characteristic map. Consequently the state-of-charge indicator can maintain a detection within + 5% FS. 9731343 Development of Electrical Water Pump for Electric Vehicle Junji Ito, Tuguo Uemura, Tadasi Kozawa (Aisan Industry Co., Ltd.) In order to meet the regulations of zero emission vehicles in the State of California, an electric vehicle was developed and produced. The electric vehicle has a cooling system to prevent heat rise from the inverter, motor and battery charger. This system requires long-life reliability, because the cooling system is operated during the time of battery charge. To satisfy this requirement, we have developed the electrical water pump, which has a brushless motor and magnetic coupling. 9731352 Gas-injection Heat Pump System for Electric Vehicle Takahisa Suzuki, Katsuya Ishii (DENSO Corporation), Fumihiko Asakawa (Toyota Motor Corporation) Since electric vehicles use electric energy, heat pumps are primarily used for the air conditioners in electric vehicles. However, while heat pumps are efficient and suitable for electric vehicles when the ambient temperature is high, when the ambient temperature is low, their heating capacity and efficiency drops, so in general they can not be used. To overcome this disadvantage, gas injection technology is applied to heat pumps and an algorithm is designed that optimizes the intermediate pressure. By combining this technology with a two-way-flow unit (1) for reducing the vehicle heat load, a heat pump was developed that can be used at ambient temperatures down to - 20°C. 9731361 A Numerical Drive Simulation for an Electric Vehicle - Improving Vehicle Performance by Hybrid Systems Takeo Makioka, Hiroyuki Tanaka, Yasuhiro Daisho, Takeshi Saito, Ryoji Kihara, Akira Yamanaka (Waseda University) A numerical simulation was performed to predict drive ranges for a micro-sized hybrid electric vehicle proposed for urban commuting. In the simulation, a series hybrid system is assumed to employ a 250 cc spark-ignition engine, 20 kW motor, 10 kW generator, an advanced Lithium-ion battery unit and a regeneration system. The results show that reducing rolling resistance and improving regeneration during deceleration are indispensable to increasing range. Moreover, the vehicle's low emission and high efficiency are demonstrated. 9731370 Development of a High-Power Lithium-Ion Battery System for HEVs Hideaki Horie, Masayuki Tohda, Yuuji Tanjyo (Nissan Motor Co., Ltd.), Jyunichi Shigetomi (Sony Energytec Inc.) We have been researching a lithium~on battery system for EV use, which provides high performance with respect to specific energy, specific power, cycle life and reliability. During the R&D work, attention was focused on the battery's potential for high specific power. This led to the development of a prototype lithium-ion battery system for HEV use. The battery provides nearly three times the specific power of conventional batteries, along with high recharging performance and
high thermal conductance. This battery is thought to have the most promising features as an energy source for HEVs. 9731389 A Design Method to Prevent Wind Noise Occurrence Using Numerical Simulation Nobuyuki Murai, Yuji Hanaoka, Kiyohira Aoki, Seiichi Ohtsu, Kyoichiro Satake, Tomio Yamashita (Isuzu Motors Limited) In order to prevent wind noise caused by air leakage through any gaps between door seals and a vehicle body, a design method using numerical simulation is developed. Unsteady flow simulation for the prediction of aerodynamic force and non-linear structural analysis for door and door seal deformation are weakly coupled and used. The method is validated by experimental results. The method is applied to the production design of a door system and its effectiveness is proved, showing dramatic reduction of wind noise level. 9731398 Investigation of Coupled Structural Acoustic Problem and Optimization Shinji Azetsu, Qinzhong Shi, lchiro Hagiwara (Tokyo Institute of Technology), Tetsuji Ichikawa (Nissan Motor Ltd.) In order to optimize the location of strengthening and to reduce the sound of vehicle interior noise, which is considered to be a difficult problem in obtaining the required sensitivity, a new approach was developed. An approximate approach by holographic neural network is proposed to optimize the sound level for the cabin of a vehicle. A simple model is used to show the efficiency of the proposed method. 9731406 Booming Noise Analysis Based on Acoustic Excitation Test Souhei Matuyama (Aichi Machine Industry Co., Ltd.), Shinichi Maruyama (Nissan Motor Co., Ltd.) For improving the booming noise of a mini van, we modified the body structure based on acoustic excitation tests to get better mechanical-acoustic transfer function characteristics. As an analysis method, acoustic excitation tests that rely on the reciprocity principle provide more clear results on deformation shape of the body that the usual constraint force excitation method. We achieved nearly the same results on mechanical acoustic transfer function characteristics by using both methods at the booming noise frequency range. We were also able to understand the deformation shape related to acoustic resonant mode. 9731415 R esearch on Vibration Characteristics Between Human Body and Seat, Steering Wheel and Pedals Shuji Nishiyama, Norio Uesugi (Hiroshima City Industrial Technology Institute), Toru Takeshima, Yuji Kano (Delta Kogyo Co., Ltd.), Hisashi Togii (Kuroishi Tekko Co., Ltd.) We have observed the vibration characteristics between human body and seat, steering wheel and pedals. The vibration magnitude of a body which is transferred from the seat, steering wheel and pedals were measured with both sinusoidal and random vibration in the vertical and fore and aft direction at frequencies up to 20 Hz. Measurement points are on the surface of head, chest, hip, thigh, chin, upper arm and lower arm. Eleven subjects were used to elucidate the factor (arm angle) that may affect human dynamic behavior. It was found that the arm angle of a human in the driving posture exerts a serious influence upon human dynamic behavior. Results are presented in the form of parametric plots and tables. 9731424 Analysis and Reduction Method of Self-excited Vibration in the Power Steering System during Rapid Steering - Experimental Consideration and Simulation of Vibration Characteristics Masaru Okubo (Nissan Motor Co., Ltd.), Koji Shikata (ESTECH Corporation) Experimental and numerical approaches were applied to analyze self-excited vibration in the hydraulic power steering system of a vehicle. A numerical analysis model is presented here which is composed of a hydraulic model and a mechanical servo model. Numerical simulations performed with this model reveal that the phase difference of the oil pressure between the servo valve and the actuator affect the vibration characteristics of the hydraulic power steering system.
Abstracts / JSAE Review 19 (1998) 89-109
The dry hybrid belt CVT(A •CVT) has attained high transmissibility by reducing transmission loss compared with an oil pressure system by using a dry hybrid belt, electric magnetic powder clutch and DC motor. The fuel consumption of a vehicle equipped with the A. CVT has proven superior to a manual transmission. This paper reports on the analysis of transmission loss. 9731334 Battery State-of-Charge Indicator for Electric Vehicle Junichi Iino, Tetsuya Kobayashi DENSO Corporation) In order to detect a state-of-charge of EVs at high accuracy, residual energy of the battery was measured in units of watt-hour and its level was defined as 0% when the vehicle can no longer travel. This indicator estimates the terminal voltage at the constant power discharge, from the instantaneous terminal voltage and current of the vehicle, and obtains the residual energy by referring to the constant power discharge voltage characteristic map. Consequently the state-of-charge indicator can maintain a detection within + 5% FS. 9731343 Development of Electrical Water Pump for Electric Vehicle Junji Ito, Tuguo Uemura, Tadasi Kozawa (Aisan Industry Co., Ltd.) In order to meet the regulations of zero emission vehicles in the State of California, an electric vehicle was developed and produced. The electric vehicle has a cooling system to prevent heat rise from the inverter, motor and battery charger. This system requires long-life reliability, because the cooling system is operated during the time of battery charge. To satisfy this requirement, we have developed the electrical water pump, which has a brushless motor and magnetic coupling. 9731352 Gas-injection Heat Pump System for Electric Vehicle Takahisa Suzuki, Katsuya Ishii (DENSO Corporation), Fumihiko Asakawa (Toyota Motor Corporation) Since electric vehicles use electric energy, heat pumps are primarily used for the air conditioners in electric vehicles. However, while heat pumps are efficient and suitable for electric vehicles when the ambient temperature is high, when the ambient temperature is low, their heating capacity and efficiency drops, so in general they can not be used. To overcome this disadvantage, gas injection technology is applied to heat pumps and an algorithm is designed that optimizes the intermediate pressure. By combining this technology with a two-way-flow unit (1) for reducing the vehicle heat load, a heat pump was developed that can be used at ambient temperatures down to - 20°C. 9731361 A Numerical Drive Simulation for an Electric Vehicle - Improving Vehicle Performance by Hybrid Systems Takeo Makioka, Hiroyuki Tanaka, Yasuhiro Daisho, Takeshi Saito, Ryoji Kihara, Akira Yamanaka (Waseda University) A numerical simulation was performed to predict drive ranges for a micro-sized hybrid electric vehicle proposed for urban commuting. In the simulation, a series hybrid system is assumed to employ a 250 cc spark-ignition engine, 20 kW motor, 10 kW generator, an advanced Lithium-ion battery unit and a regeneration system. The results show that reducing rolling resistance and improving regeneration during deceleration are indispensable to increasing range. Moreover, the vehicle's low emission and high efficiency are demonstrated. 9731370 Development of a High-Power Lithium-Ion Battery System for HEVs Hideaki Horie, Masayuki Tohda, Yuuji Tanjyo (Nissan Motor Co., Ltd.), Jyunichi Shigetomi (Sony Energytec Inc.) We have been researching a lithium~on battery system for EV use, which provides high performance with respect to specific energy, specific power, cycle life and reliability. During the R&D work, attention was focused on the battery's potential for high specific power. This led to the development of a prototype lithium-ion battery system for HEV use. The battery provides nearly three times the specific power of conventional batteries, along with high recharging performance and
high thermal conductance. This battery is thought to have the most promising features as an energy source for HEVs. 9731389 A Design Method to Prevent Wind Noise Occurrence Using Numerical Simulation Nobuyuki Murai, Yuji Hanaoka, Kiyohira Aoki, Seiichi Ohtsu, Kyoichiro Satake, Tomio Yamashita (Isuzu Motors Limited) In order to prevent wind noise caused by air leakage through any gaps between door seals and a vehicle body, a design method using numerical simulation is developed. Unsteady flow simulation for the prediction of aerodynamic force and non-linear structural analysis for door and door seal deformation are weakly coupled and used. The method is validated by experimental results. The method is applied to the production design of a door system and its effectiveness is proved, showing dramatic reduction of wind noise level. 9731398 Investigation of Coupled Structural Acoustic Problem and Optimization Shinji Azetsu, Qinzhong Shi, lchiro Hagiwara (Tokyo Institute of Technology), Tetsuji Ichikawa (Nissan Motor Ltd.) In order to optimize the location of strengthening and to reduce the sound of vehicle interior noise, which is considered to be a difficult problem in obtaining the required sensitivity, a new approach was developed. An approximate approach by holographic neural network is proposed to optimize the sound level for the cabin of a vehicle. A simple model is used to show the efficiency of the proposed method. 9731406 Booming Noise Analysis Based on Acoustic Excitation Test Souhei Matuyama (Aichi Machine Industry Co., Ltd.), Shinichi Maruyama (Nissan Motor Co., Ltd.) For improving the booming noise of a mini van, we modified the body structure based on acoustic excitation tests to get better mechanical-acoustic transfer function characteristics. As an analysis method, acoustic excitation tests that rely on the reciprocity principle provide more clear results on deformation shape of the body that the usual constraint force excitation method. We achieved nearly the same results on mechanical acoustic transfer function characteristics by using both methods at the booming noise frequency range. We were also able to understand the deformation shape related to acoustic resonant mode. 9731415 R esearch on Vibration Characteristics Between Human Body and Seat, Steering Wheel and Pedals Shuji Nishiyama, Norio Uesugi (Hiroshima City Industrial Technology Institute), Toru Takeshima, Yuji Kano (Delta Kogyo Co., Ltd.), Hisashi Togii (Kuroishi Tekko Co., Ltd.) We have observed the vibration characteristics between human body and seat, steering wheel and pedals. The vibration magnitude of a body which is transferred from the seat, steering wheel and pedals were measured with both sinusoidal and random vibration in the vertical and fore and aft direction at frequencies up to 20 Hz. Measurement points are on the surface of head, chest, hip, thigh, chin, upper arm and lower arm. Eleven subjects were used to elucidate the factor (arm angle) that may affect human dynamic behavior. It was found that the arm angle of a human in the driving posture exerts a serious influence upon human dynamic behavior. Results are presented in the form of parametric plots and tables. 9731424 Analysis and Reduction Method of Self-excited Vibration in the Power Steering System during Rapid Steering - Experimental Consideration and Simulation of Vibration Characteristics Masaru Okubo (Nissan Motor Co., Ltd.), Koji Shikata (ESTECH Corporation) Experimental and numerical approaches were applied to analyze self-excited vibration in the hydraulic power steering system of a vehicle. A numerical analysis model is presented here which is composed of a hydraulic model and a mechanical servo model. Numerical simulations performed with this model reveal that the phase difference of the oil pressure between the servo valve and the actuator affect the vibration characteristics of the hydraulic power steering system.