Papers by Keyword: Hybrid Electric Vehicle (HEV)

Abstract: The paper presents the research’s made within the Alternative Propulsion Systems Electric and Hybrid Vehicles laboratory, from Automotive Engineering Research Centre, National University of Science and Technology Politehnica Bucharest-Pitesti branch in the field of hybrid mobility. Starting with 2002, electric and hybrid vehicle projects have been developed in this laboratory with the funding of National Council for Scientific Research in Higher Education and the support of Automobile Dacia, Renault Technologie Roumanie. These are based on vehicles in production on the Dacia cars. Among the hybrid concepts studied, we mention Nova EcoMatic Hybrid, Logan Eco Hybrid, Grand Sandero Hybrid Utility Vehicle, Hamster Electricway Hybrid, Grand Hamster Electricway Plug-in Hybrid, Gaster Electricway PHEV. The electric concepts studied were Logan Electra, Duster ZERO 4X4, Sandero Electron. Other projects were related to wireless charging systems in collaboration with INDAELTRAC Craiova and with a mobile station off grid powered by an alternative source inclusive photovoltaic panel.

Abstract: Hybrid and electric vehicles (EVs) have become increasingly popular due to reduced gasoline consumption and significant environmental benefits. The majority of the functions of these vehicles rely on the battery power and batteries tend to degrade over time. Testing and maintenance of the batteries of these vehicles are essential. Thus, hybrid vehicle battery testers are utilized for this purpose. These testers are often expensive and come as a set of gadgets. In particular, the battery testers depend on, computers or mobile devices to display the results when needed. Therefore, the battery testers are getting expensive, and having several types of equipment makes the use of a tester a hassle. To solve these shortcomings, we developed a low-cost, portable hybrid vehicle tester that is custom-made for the Sri Lankan context, focusing on its ease of use and practicality. Our device can successfully detect weak cells present in hybrid and electric vehicle batteries by carefully calculating the discharging time of each of the cells. In addition to being compatible with a variety of hybrid and electric vehicle batteries, this lightweight tester is an inexpensive, self-supporting test tool that complies with sustainable vehicle maintenance processes. This paper discusses the current practice and the methods for hybrid electric vehicle (HEV) battery testing and their disadvantages. Furthermore, the development of the low-cost and portable battery tester as well as the main functions of the device are presented in detail. Finally, the results used for the verification of the developed device are presented and discussed.

Abstract: This paper presents magnetic flux analysis of E-Core Hybrid Excited FSM with various rotor pole topologies. The stator consists of three active fluxes sources namely armature coil, field excitation coil and permanent magnet, while the rotor consists of only stack of iron which is greatly reliable for high speed operation. Initially, coil arrangement tests are examined to validate the operating principle of the motor and to identify the zero rotor position. Then, performances of 6S-4P, 6S-5P, 6S-7P and 6S-8P E-Core HEFSMs such as flux path, flux linkage, cogging torque and flux distribution are observed. As conclusion, 6S-5P and 6S-7P designs have purely sinusoidal flux waveform and less cogging torque suitable for high torque and power motor.

Abstract: Research on hybrid electric vehicle (HEV) which combined battery based electric motor and conventional internal combustion engine (ICE) have been intensively increased since the last decade due to their promising solution that can reduce global warming. Some examples of electric motors designed for HEV propulsion system at present are dc motor, induction motor (IM), interior permanent magnet synchronous motor (IPMSM) and switched reluctance motor (SRM). Although IPMSMs are considered to be one of the successful electric motor used in HEVs, several limitations such as distributed armature windings, un-control permanent magnet (PM) flux and higher rotor mechanical stress should be resolved. In this paper, design improvement of E-Core hybrid excitation flux switching motor (HEFSM) for hybrid electric vehicles (HEVs) applications are presented. With concentrated armature and field excitation coil (FEC) windings, variable flux capability and robust rotor structure, performances of initial and improved 6S-14PE-Core HEFSM are analyzed. The improved topology has achieved highest torque and power of 246.557Nm and 187.302 kW, respectively.

Abstract: This paper presents a new structure of field excitation flux switching motor (FEFSM) as an alternative candidate of non-permanent magnet (PM) machine. The rotor is consisted of only stack of iron and hence, it is reliable and appropriate for high speed operation. Initially, the coil arrangement tests are examined to validate the operating principle of the motor and to identify the zero rotor position. Furthermore, the profile of flux linkage, induced voltage, cogging torque, torque and power characteristics are observed based on 2D finite element analysis (FEA). Initial performances show that 8S-12P FEFSM produce torque and power of 8.79Nm and 1.5kW, respectively with low cogging torque and sinusoidal flux waveform. Further design refinement and optimization will be conducted to improve the performances of the motor.

Abstract: This paper presents a new structure of hybrid excitation flux switching motor (HEFSM) using segmental rotor and the comparison of HEFSM and FEFSM using segmental rotor is performed to find the best candidate for hybrid electric vehicles (HEV). (HEFSM) using segmental rotor contains both the FEC and PM on the stator to produce maximum flux linkages. Initially, the coil arrangement tests are examined to validate the operating principle of the (HEFSM) using segmental rotor. Moreover the profile of flux linkage, cogging torque, and torque characteristics at various armature current densities of both the (HEFSM) and (FEFSM) using segmental rotor are observed based on 2D-finite element analysis (FEA). Initially performances show that HEFSM using segmental rotor produces torque of 18 Nm with low cogging torque and sinusoidal flux waveform. Thus by further design optimization the proposed motor will effectively achieve the target performances.

Abstract: The goal of the present contribution is to propose a new control strategy of drive train for the improvement of efficiency of regenerative braking system. In this new control strategy, the backward numerical solution is utilized to realize the cooperative operation of the electric machine and CVT. The analysis for the proposed control strategy is fulfilled based on the vehicle model. The results show that, compared to the existing one without considering the affect of CVT’s efficiency, the proposed control strategy could make more kinetic energies in the vehicle be recaptured.

Abstract: Power split device (PSD) affects the power performance and control strategy of hybrid electric vehicle (HEV). In this paper, a new threshold function for wavelet denoising is used to reduce noise in test torque and rotational speed data. The dynamic simulation is carried out at the moment of planetary gear shaft (PGS) failure, after the rigid-flexible coupled model of PSD is established. According to the obtained stress of PGS, analysis of PGS fracture is verified.

Abstract: The hybrid electric vehicle (HEV) is becoming one of the main trends of the development of automobile technology. The structure and operation principle of HEV are introduced. The noise and vibration (NV) of engine, motor, generator, power split device, converter assembly and battery in HEV were analyzed. According to the NV characteristics in HEV, the measurements for NV control technology such as the excitation source control technology and route control technology were summarized, which provides a reference for further studying of the NV in HEV.

Abstract: Power management of hybrid electric vehicle (HEV) is an important operational factor for HEV to enhance fuel economy and reduce emissions. Optimal control for HEV requires the knowledge of entire driving cycle and elevation profile to obtain the optimal control strategy over fixed driving cycle. In this paper, the traffic knowledge extracted from intelligent transportation systems (ITSs),global positioning systems (GPSs) and geographical information systems (GISs) is used for predicting the knowledge of the future driving cycle, and the real-time optimal control strategy based on dynamic programming in a moving window is investigated in order to minimize fuel consumption. A simulation study was conducted for two driving cycles, and the results showed significant improvement in fuel economy compared with a rule-based control. Furthermore, the results showed that the distance of the moving window has obvious effect on the fuel economy.