The Experts below are selected from a list of 5406 Experts worldwide ranked by ideXlab platform
J S Lee - One of the best experts on this subject based on the ideXlab platform.
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Theoretical investigation of a variable displacement vane-type Oil Pump
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2013Co-Authors: D. Q. Truong, Kook Young Ahn, Nguyen Thanh Trung, J S LeeAbstract:Variable displacement vane-type Oil Pumps represent one of the most innovative Pump types for industrial applications, especially for engine lubrication systems. This article deals with a mathematical modeling method for theoretical performance investigation of a typical variable displacement vane-type Oil Pump. This theoretical model is based on the Pump geometric design and dynamic analyses. It can be considered as a generation step for a deeper understanding of the Pump operation as well as for effectively implementing the Pump control mechanisms to satisfy the urgent demands of engine lubrication systems. The developed theoretical Pump model is finally illustrated by numerical simulations. © IMechE 2012.
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Performance analysis of a variable-displacement vane-type Oil Pump for engine lubrication using a complete mathematical model
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2013Co-Authors: D. Q. Truong, Kook Young Ahn, Nguyen Thanh Trung, J S LeeAbstract:Variable-displacement vane-type Oil Pumps represent one of the most innovative Pump types for industrial applications, especially for engine lubrication systems. The aim of this paper is to develop a complete and accurate mathematical model for a typical variable-displacement vane-type Oil Pump to investigate its working performance. First, the detailed theoretical model was built on the basis of Pump geometric design and dynamic analyses. Next, numerical simulations with the constructed model and experiments on the actual Pump system were carried out to analyse the main power loss factors in order to develop the complete model for high modelling accuracy. The estimated Pump performance using the complete Pump model was finally verified by numerical simulations in comparison with practical tests. © IMechE 2013.
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Development and control of an electric Oil Pump for automatic transmission-based hybrid electric vehicle
IEEE Transactions on Vehicular Technology, 2011Co-Authors: Yeonho Kim, Yongha Kim, Chihoon Jo, J S Lee, Jinu Kim, Jaesang Lee, Jonghyun Kim, Minseok Song, Hyunsoo KimAbstract:We developed an electric Oil Pump (EOP) and a control algorithm for automatic transmission (AT)-based two-shaft parallel hybrid electric vehicles (HEVs). The EOP capacity was designed based on AT Oil Pump test results, and the torque of the EOP motor was determined by considering the flow rate and efficiency calculated according to the operating temperature of the AT fluid. A control algorithm consisting of low, high, and middle speeds according to the HEV driving mode was proposed for the operation of the designed EOP. Control logic was proposed to reduce the EOP energy requirements in the middle-speed range, in which the EOP and AT Oil Pump operate together. We verified that this control method could reduce electric load while supplying the required hydraulic pressure.
Hyunsoo Kim - One of the best experts on this subject based on the ideXlab platform.
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Development of an electric Oil Pump control algorithm for an automatic-transmission-based hybrid electric vehicle considering the gear shift characteristics
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2014Co-Authors: Minseok Song, Yeonho Kim, Jinu Kim, J Oh, J. Yi, Hyunsoo KimAbstract:In this paper, an electric Oil Pump control algorithm for an automatic-transmission-based hybrid electric vehicle was proposed. Dynamic models of the hybrid electric vehicle powertrain and hydraulic control system, including a mechanical Oil Pump and an electric Oil Pump, were obtained, and a hybrid electric vehicle performance simulator was developed. Also, a flow consumption model of the hydraulic control system was constructed. To represent the characteristics of the hydraulic control system according to the change in the temperature of the automatic transmission fluid, a viscosity index concept was introduced. Based on the simulation and test results, a viscosity index-line pressure-electric Oil Pump power map was proposed to describe the power supply requirement according to the viscosity index and the required line pressure. Using the viscosity index-line pressure-electric Oil Pump power map, an electric Oil Pump control algorithm was suggested to control the electric Oil Pump by using multi-stage power for a given viscosity index. The mechanical Oil Pump speed at which the electric Oil Pump is turned off was obtained on the basis of the flow consumption model. The electric Oil Pump control algorithm was evaluated by experiments and simulations. The proposed electric Oil Pump control algorithm satisfied the target line pressure requirement according to the viscosity index. In addition, an electric Oil Pump control strategy during an automatic transmission gear shift was suggested for the situation in which the maximum line pressure required for the gear shift cannot be achieved by only the mechanical Oil Pump. The electric-Oil-Pump-assisted power was determined from the flow consumption model and the mechanical Oil Pump speed considering the gear shift. The simulation results confirmed that the electric Oil Pump control strategy satisfied the maximum line pressure during a gear shift. © IMechE 2013.
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Development and control of an electric Oil Pump for automatic transmission-based hybrid electric vehicle
IEEE Transactions on Vehicular Technology, 2011Co-Authors: Yeonho Kim, Yongha Kim, Chihoon Jo, J S Lee, Jinu Kim, Jaesang Lee, Jonghyun Kim, Minseok Song, Hyunsoo KimAbstract:We developed an electric Oil Pump (EOP) and a control algorithm for automatic transmission (AT)-based two-shaft parallel hybrid electric vehicles (HEVs). The EOP capacity was designed based on AT Oil Pump test results, and the torque of the EOP motor was determined by considering the flow rate and efficiency calculated according to the operating temperature of the AT fluid. A control algorithm consisting of low, high, and middle speeds according to the HEV driving mode was proposed for the operation of the designed EOP. Control logic was proposed to reduce the EOP energy requirements in the middle-speed range, in which the EOP and AT Oil Pump operate together. We verified that this control method could reduce electric load while supplying the required hydraulic pressure.
Feitie Zhang - One of the best experts on this subject based on the ideXlab platform.
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Electric Oil Pump design of hybrid continuously variable transmission
IET Electric Power Applications, 2019Co-Authors: Yunshan Zhou, Daohai Qu, Feitie ZhangAbstract:An electric Oil Pump (EOP) must be used to supply Oil for actuators in the hybrid continuously variable transmission (CVT) on the launch state of vehicle. To develop this EOP, the current CVT-based hybrid schemes and the use of EOP on traditional automatic transmissions are analysed. Permanent magnet synchronous motor (PMSM) type is chosen as the power source of the developed EOP for its advantages of high efficiency and long-life cycle. The PMSM EOP motor is designed and simulated by ANSYS EM. Based on the parameters of the simulation results, the sensor-less speed controller of the EOP is designed. Then, the model of the EOP and its load CVT hydraulic system are established by Simulink and AMEsim, respectively, for joint simulation. The simulation results show that the EOP can respond to the speed command request quickly, and when the load of the hydraulic system changes it also can keep the speed stable. Finally, based on the developed prototype of EOP and hybrid CVT, the correctness of the developed EOP and its sensorless speed controller are verified by bench test.
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Hydraulic System Control for a Hybrid Continuously Variable Transmission Based on an Electric Oil Pump
IEEE Transactions on Vehicular Technology, 2018Co-Authors: Yunshan Zhou, Daohai Qu, Jiande Wang, Feitie ZhangAbstract:An electric Oil Pump (EOP) for the hydraulic system of a continuously variable transmission (CVT) based hybrid electric vehicle is developed by considering the arrangement of structures and the realization of an electric drive mode (EDM). The basic parameters required for the EOP motor are obtained by analyzing the flow rate and pressure of CVT. Then, the EOP motor is designed and developed. Current-pressure characteristics of different solenoid valves are measured and analyzed for designing the CVT speed ratio controller. The speed ratio controller, pressure controller, and EOP control strategy are analyzed in detail with the use of EOP as the power source of the hydraulic system only. The performances of the speed ratio controller and the EOP control strategy are verified on a test bench. Experimental results show that the steady-state error of the speed ratio controller is minimal, and the response time of speed ratio from 0.7 to 1.4 can be shortened approximately 0.49 s to 1.40 s by increasing the EOP speed from 1000 to 2500 r/min. The actual EOP speed can also be adjusted by the demand of system flow to save the maximum amount of energy.
Yeonho Kim - One of the best experts on this subject based on the ideXlab platform.
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Development of an electric Oil Pump control algorithm for an automatic-transmission-based hybrid electric vehicle considering the gear shift characteristics
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2014Co-Authors: Minseok Song, Yeonho Kim, Jinu Kim, J Oh, J. Yi, Hyunsoo KimAbstract:In this paper, an electric Oil Pump control algorithm for an automatic-transmission-based hybrid electric vehicle was proposed. Dynamic models of the hybrid electric vehicle powertrain and hydraulic control system, including a mechanical Oil Pump and an electric Oil Pump, were obtained, and a hybrid electric vehicle performance simulator was developed. Also, a flow consumption model of the hydraulic control system was constructed. To represent the characteristics of the hydraulic control system according to the change in the temperature of the automatic transmission fluid, a viscosity index concept was introduced. Based on the simulation and test results, a viscosity index-line pressure-electric Oil Pump power map was proposed to describe the power supply requirement according to the viscosity index and the required line pressure. Using the viscosity index-line pressure-electric Oil Pump power map, an electric Oil Pump control algorithm was suggested to control the electric Oil Pump by using multi-stage power for a given viscosity index. The mechanical Oil Pump speed at which the electric Oil Pump is turned off was obtained on the basis of the flow consumption model. The electric Oil Pump control algorithm was evaluated by experiments and simulations. The proposed electric Oil Pump control algorithm satisfied the target line pressure requirement according to the viscosity index. In addition, an electric Oil Pump control strategy during an automatic transmission gear shift was suggested for the situation in which the maximum line pressure required for the gear shift cannot be achieved by only the mechanical Oil Pump. The electric-Oil-Pump-assisted power was determined from the flow consumption model and the mechanical Oil Pump speed considering the gear shift. The simulation results confirmed that the electric Oil Pump control strategy satisfied the maximum line pressure during a gear shift. © IMechE 2013.
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Development and control of an electric Oil Pump for automatic transmission-based hybrid electric vehicle
IEEE Transactions on Vehicular Technology, 2011Co-Authors: Yeonho Kim, Yongha Kim, Chihoon Jo, J S Lee, Jinu Kim, Jaesang Lee, Jonghyun Kim, Minseok Song, Hyunsoo KimAbstract:We developed an electric Oil Pump (EOP) and a control algorithm for automatic transmission (AT)-based two-shaft parallel hybrid electric vehicles (HEVs). The EOP capacity was designed based on AT Oil Pump test results, and the torque of the EOP motor was determined by considering the flow rate and efficiency calculated according to the operating temperature of the AT fluid. A control algorithm consisting of low, high, and middle speeds according to the HEV driving mode was proposed for the operation of the designed EOP. Control logic was proposed to reduce the EOP energy requirements in the middle-speed range, in which the EOP and AT Oil Pump operate together. We verified that this control method could reduce electric load while supplying the required hydraulic pressure.
R Sarunac - One of the best experts on this subject based on the ideXlab platform.
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Steady-state temperature rises of ONAN/ONAF/OFAF transformers
IEE Proceedings C Generation Transmission and Distribution, 1992Co-Authors: Zdenko Godec, R SarunacAbstract:In the piping between the tank of a 40 MVA transformer, originally designed for ONAN/ONAF cooling combination, and its bank of radiators, a propeller Oil Pump was installed. Characteristic temperature rises were measured before and after installation of the Pump. The results were applied to the development of a new algorithm for calculation of windings and Oil steady-state temperature rises of ONAN/ONAF/OFAF transformers. The mathematical model is briefly described in the paper, and the basic thermal characteristics of transformers with this combination of cooling types are described. Installation of the Oil Pump can make transformer cooling more efficient provided that certain conditions are satisfied.
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Steady-state temperature rises of ONAN/ONAF/OFAF transformers
Generation Transmission and Distribution IEE Proceedings C (1992), 1992Co-Authors: Zdenko Godec, R SarunacAbstract:In the piping between the tank of a 40 MVA transformer, originally designed for ONAN/ONAF cooling combination, and its bank of radiators, a propeller Oil Pump was installed. Characteristic temperature rises were measured before and after installation of the Pump. The results were applied to the development of a new algorithm for calculation of windings and Oil steady-state temperature rises of ONAN/ONAF/OFAF transformers. The mathematical model is briefly described by the authors, and the basic thermal characteristics of transformers with this combination of cooling types are described. Installation of the Oil Pump can make transformer cooling more efficient provided that certain conditions are satisfied
