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Viewing 1 to 30 of 2088
2015-11-24
Event
2015-10-27
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2015-09-22
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2015-08-25
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2015-07-28
Event
2015-06-23
Event
2015-05-26
Event
2015-05-20
Book
This is the electronic format of the Journal.
2015-04-28
Event
2015-04-23
Event
Power electronics and electric motors are essential for improving vehicle efficiency through drivetrain electrification. Technologies that support high efficiency, high power density, and low cost motors and power modules are required for the success of vehicle electrification.
2015-04-22
Event
This session covers powertrain control processes related to achieving stringent market fuel economy, emissions, performance, reliability, and quality demands of hybrid and electric powertrains. Topics include the control, calibration, and diagnostics of the engine, powertrain, and supporting electromechanical subsystems related to energy management.
2015-04-22
Event
This session covers powertrain control processes related to achieving stringent market fuel economy, emissions, performance, reliability, and quality demands of hybrid and electric powertrains. Topics include the control, calibration, and diagnostics of the engine, powertrain, and supporting electromechanical subsystems related to energy management.
2015-04-22
Event
This session covers new production and near-production hybrid powertrains, hybrid architecture, and testing.
2015-04-22
Event
Power electronics and electric motors are essential for improving vehicle efficiency through drivetrain electrification. Technologies that support high efficiency, high power density, and low cost motors and power modules are required for the success of vehicle electrification.
2015-04-22
Event
In this session speakers will explore the issues and design strategies of bringing sustainable EV, PHEV and vehicle electrification technologies to market. Identifying the customer value of these sustainable technologies is key to their success and growth. The design models and systems presented in this session highlight ways to optimize customer value to make these technologies successful.
2015-04-21
Event
This session deals with the analytical and experimental studies of vehicle electric drive vehicles or any non-conventional vehicle concepts that stretch the vehicle dynamics/mobility performance using intelligent technologies such as in-wheel motors, torque-vectoring controls, multi-wheel steer-by-wire, etc.
2015-04-21
Event
This session covers new production and near-production hybrid powertrains, hybrid architecture, and testing.
2015-04-14
Technical Paper
2015-01-1688
Eric Wood, Jeremy S. Neubauer, Evan Burton
With support from the Vehicle Technologies Office in the U.S. Department of Energy, the National Renewable Energy Laboratory (NREL) has developed BLAST-V—the Battery Lifetime Analysis and Simulation Tool for Vehicles. The addition of high resolution spatial-temporal travel histories has enabled BLAST-V to investigate user-defined infrastructure rollouts of publically accessible charging infrastructure, as well as quantify impacts on vehicle and station owners in terms of improved vehicle utility and station throughput. This paper will present simulation outputs from BLAST-V quantifying the utility improvements of multiple distinct rollouts of publically available level 2 electric vehicle service equipment (EVSE) in the Seattle metropolitan area. Publically available data on existing level 2 EVSE will also be used as an input to BLAST-V with resulting vehicle utility compared to a number of mock rollout scenarios.
2015-04-14
Technical Paper
2015-01-0247
Sonakshi Sharma, Shubhranshu Garg, Vipul Kumar, Sudhir Kashinath Gupte
There are variety of motors and generators/alternators being manufactured internationally, for variety of applications. It is a difficult task for the user to identify and select the type of motor /generator/alternator for a specific use, by the designer and ultimately the user is totally unaware of what is bought and why. There is a need to designate the motors and generators so that by interpretation of the identification nomenclature of the motor or generator it can be judged that what type it is, whether a series motor, an induction motor etc, in case of motors. This will eventually make it easy for the manufacturer, the buyer and the consumer to identify the motor or generator type. So a universally accepted and followed identification nomenclature is required to be developed which will henceforth make dealing in motors and generators simpler. It will prove to be useful during troubleshooting.
2015-04-14
Journal Article
2015-01-1206
Manabu Yazaki
In recent years, the application of hybrid electric vehicle (HEV) technologies to a wide range of vehicles, from small to large vehicles and sedans to SUVs, has been expanding rapidly. Market demand for quiet drive is strong, and HEV systems are able to operate using motor drive alone, eliminating engine vibration and noise. To reduce torque fluctuation in order to reduce vibration and noise, distributed winding is used in the stators of the drive motors employed in many existing electric vehicles (EV) including HEV. However, because the coil ends of distributed windings are large, space for fitting is restricted. Concentrated winding is one method of reducing the size of the motor, because the coil ends can be made smaller. As winding resistance is lower in concentrated winding than in distributed winding copper loss is reduced, and the coils are effective under high-torque conditions.
2015-04-14
Technical Paper
2015-01-1207
Makarand Kane, Swanand Kulkarni, Shinto Antony, Rohit Kharat, Naga Chaithanya
Hybrid and electric vehicles are being explored as future transportation alternatives to curb emissions and reduce dependence on fossil fuels. In small car segment, as far as hybridization is concerned, the space and safety constraint demands use of lower voltage viz. 48 V as compared to >100-volt-systems used for vehicles in other segments. 48 V systems also have advantage of reduced copper weight due to reduced current. As 48 V systems become prevalent and replace conventional 12 V systems, the auxiliary 12 V loads would necessitate implementation of several DC-DC converters. As this is redundant design, it is better to re-design at least some of the 12 V auxiliary systems to 48 V such as the radiator fan motor. However, the issues faced in the existing PMDC Motor with regard to efficiency and sizing has generated interest to investigate better alternatives for the motor.
2015-04-14
Technical Paper
2015-01-1216
Dafeng Song, Chang Zhang, Nannan Yang, Mingli Shang, Yujun Peng
Hybrid Electric Vehicles with a power split system provide a variety of possibilities to promote the fuel economy of vehicles and better adapt to various driving conditions. In this paper, a new power split system of a hybrid electric bus which consists of double planetary gear sets and a clutch is introduced. The system is able to decouple both the torque and speed of the engine from the road load, which makes it possible for the engine to operate on its optimal operation line (OOL). Considering the features of the system configuration and bus driving cycle, the driving mode of the bus is divided into Electric Vehicle (EV) mode, Electric Variable Transmission (EVT) mode and Parallel mode. By controlling the engagement of the clutch at high vehicle speed (after the mechanical point), the system operates in the parallel mode rather than EVT mode. This avoids the problem that the system efficiency sharply declines in high speed region which EVT configurations are generally faced with.
2015-04-14
Technical Paper
2015-01-1217
Changhong Liu, Lin Liu
Many problems are associated with the large battery operation current, such as battery overheating, lithium plating, and mechanical structural instability of battery materials. All these problems may cause battery safety issues in fuel cell hybrid vehicles (FCHVs), e.g., battery explosions and thermal runaway have been reported and may cause the anxiety of the public about the FCHVs. Previous researches about FCHV power management strategy have focused on minimizing fuel consumption and powertrain cost. More attention needs to put on the battery current constraint for the analysis of battery state of charge (SOC) and battery state of health (SOH). This research targets optimizing the FCHV battery pack operation within a safe current range through power management strategy to increase the safety of the battery pack while improving battery usage via SOC control. Battery SOH is also evaluated in the study.
2015-04-14
Technical Paper
2015-01-1218
Ling Zheng, Yue Ren, Qiran Huang, Yinong Li, Zhenfei Zhan
The control strategy of a switched reluctance (SR) motor used as in-wheel motor for four wheel independent driving electric vehicle is investigated in order to reduce the influence of torque ripple in motor on the ride comfort in electric vehicle. The nonlinear model of switched reluctance (SR) motor is established and the variable angle control strategy with optimal switch angles is applied to the control of SR motor. However, the variable angle control strategy can not reduce the torque ripple of switched reluctance (SR) motor significantly. Therefore, some advanced control strategies are developed to improve the ride comfort in electric vehicle. In this paper, a switched reluctance (SR) motor is designed and the fuzzy proportional integration differential (PID) is developed to improve the torque ripple of switched reluctance (SR) motor in electric vehicle.
2015-04-14
Technical Paper
2015-01-1219
Jerome Meisel, Wassif Shabbir, Simos A Evangelou
Abstract— Using measurable physical input variables, an implementable control algorithm for parallel architecture plug-in and non-plug-in hybrid electric vehicle (PHEV and HEV) powertrains is presented. The control of the electric drive is based on an algebraic mapping of the accelerator pedal position, the battery state-of-charge (SOC), and the vehicle velocity into a motor controller input torque command. This mapping is developed using a sequential linearization control (SLC) methodology. The internal combustion engine (ICE) control uses a modified accelerator pedal to throttle plate angle mapping that includes an adjustable gain parameter that, in turn, determines the sustained non-depleting battery SOC. The control methodology transitions from charge-depleting hybrid operation to non-depleting operation without any mode switching in the control algorithm. Searches over an admissible control space or the use of pre-defined look-up tables are thus avoided.
2015-04-14
Technical Paper
2015-01-1214
Zhiguo Zhao, Chen Wang, Tong Zhang, Xianjun Dai, Xiyue Yuan
A novel compound power-split hybrid transmission based on a modified Ravigneaux gear set is presented. The equivalent lever diagrams are used to investigate the electric operating mode for the hybrid transmission, and then its dynamic and kinematic characteristics as well as efficiency characteristics in equations are described. A brake clutch mounted on the carrier shaft is proposed to enhance the electric driving efficiency for the hybrid transmission. Three types of electric operating mode are analyzed by the simplified combined lever diagram and the system efficiency and output characteristic for these electric operating modes is compared. A major influence on output torque of the hybrid transmission derived from the torque capability of motors and brake clutch is depicted.
2015-04-14
Technical Paper
2015-01-1215
George Dixon, Richard Stobart, Thomas Steffen
This paper presents the implementation of a vehicle and powertrain model of the parallel hybrid electric vehicle which can be used for several purposes: as a backwards model for estimating fuel consumption, as a forwards model for estimating performance, and as a control model for the hybrid powertrain optimisation. The model is specified as a multi-domain physical model in MATLAB Simscape, which captures the key electrical, mechanical and thermal energy flows in the vehicles. By applying hand crafted boundary conditions, this model can be simulation either in a forwards or backwards direction, and it can easily be simplified as required to address specific control problems. The model represents a parallel hybrid vehicle in the A-segment, which is being developed in the TC48 project.
2015-04-14
Technical Paper
2015-01-1224
Ipek Sarac, Andreas Wagner, Uta Fischer, Rainer Schnurr
Challenges such as more stringent emission regulations and growing customer expectations for reduced real-life fuel consumption lead to an increase in percentage of hybrid electric vehicles (HEV) and ever stronger electrification of power train. Optimal energy consumption management for HEV requires a priori knowledge of route characteristics. By incorporating an in-vehicle navigation unit, partial route information such as slope, speed limit and curvature can be obtained and used to improve fuel consumption. Recently, several studies investigated planning of a near optimal driving strategy based on navigation information (e.g. Connected energy-based power train control for various hybrid vehicle topologies, Radke et al). By restricting combustion engine operation, HEV introduces new challenges to On-Board Diagnosis (OBD) functions which monitor emission-related power train components. Typically, an OBD function is associated with a condition which must hold throughout its execution.
2015-04-14
Technical Paper
2015-01-0421
Hye Seong Heo, Christoph Pannemann, Yun Kyu Choi, Achim Strass
The energy sources of electrified vehicles, weather it is a high-power battery or a fuel cell, deliver direct current which has to be inverted into alternating current for the electric motor. The core of the main inverter in electrified vehicles is the IGBT power module. During the operational lifetime, the IGBT modules are exposed to harsh environmental conditions such as severe temperature cycles. Active temperature cycles are a result of internal heating of the dies caused by inverting the direct current while driving. Passive temperature cycles are caused by variations of the ambient temperature like summer and winter cycles or by variations of the performance of the cooling system. Moisture or mechanical stress through vibration or shock are other factors that limit the lifetime of the IGBT module. Many papers have been written about reliability testing of power modules, life time modelling and calculation. However, only little has been published from experience in the field.
Viewing 1 to 30 of 2088

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