Current Issue : October - December Volume : 2019 Issue Number : 4 Articles : 5 Articles
The rising population in suburban areas have led to an increasing demand for commuter\nbuses. Coupled with a desire to reduce pollution from the daily routine of traveling and transportation,\nelectric vehicles have become more interesting as an alternative placement for internal combustion\nengine vehicles. However, in comparison to those conventional vehicles, electric vehicles have an issue\nof limited driving range. One of the main challenges in designing electric vehicles (EVs) is to estimate\nthe size and power of energy storage system, i.e., battery pack, for any specific application. Reliable\ninformation on energy consumption of vehicle of interest is therefore necessary for a successful EV\nimplementation in terms of both performance and cost. However, energy consumption usually\ndepends on several factors such as traffic conditions, driving cycle, velocities, road topology, etc.\nThis paper presents an energy consumption analysis of electric vehicle in three different route types\ni.e., closed-area, inter-city, and local feeder operated by campus tram and shuttle bus. The driving\ndata of NGV campus trams operating in a university located in suburban Bangkok and that of shuttle\nbuses operating between local areas and en route to the city were collected and the corresponding\nrepresentative driving cycles for each route were generated. The purpose of this study was to carry\nout a battery sizing based on the fulfilment of power requirements from the representative real\ndriving pattern in Thailand. The real driving cycle data i.e., velocity and vehicle global position were\ncollected through a GPS-based piece of equipment, VBOX. Three campus driving data types were\ngathered to achieve a suitable dimensioning of battery systems for electrified university public buses....
Achieving high efficiency and high torque is an important target in EV motors. This\npaper describes the effect of the magnetic properties of electrical steels used as core materials for\nsynchronous motors with permanent magnets, which are commonly used as the EV traction motors.\nIt was confirmed that electrical steels, which have high flux density and low iron loss properties\ncan realize high motor efficiency and torque. When PWM excitation is considered, thinner electrical\nsteels are advantageous to suppress increased loss due to higher harmonics. Based on these results,\nelectrical steels having high flux densities and low iron losses at high frequencies were developed....
Vehicle speed is an important parameter that finds tremendous application in\ntraffic control identifying over speed vehicles with a view to reducing accidents.\nMany methods, such as using RADAR and LIDAR sensors have been\nproposed. However, these are expensive, and their accuracy is not quite satisfactory.\nIn this paper, a video-based vehicle speed determination method is\npresented. The method shows satisfactory performance on standard data sets\nand gives that error rate of velocity estimation is within 10%....
When the pure electric mining dump truck is working, it mainly ascends the slope at full\nload and descends the slope at no load. The loading state of the vehicle and the slope of the road\nwill directly affect its axle load distribution and braking force distribution. In this paper, the slope\ndynamics analysis of the pure electric double-axle four-wheel drive mining dump truck was\ncarried out. Based on the regenerative braking priority strategy, four regenerative braking control\nmethods were developed based on the Matlab/Simulink platform and ADVISOR 2002 vehicle\nsimulation software to study the ability of regenerative braking energy recovery and its impact on\nvehicle economic performance........
In order to improve the braking performance of electric vehicles, a novel brake-by-wire\nactuator based on an electro-magnetic linear motor was designed and manufactured. For the\npurpose of braking force regulation accuracy and high robust performance, the state observer and\nthe anti-disturbance controller were designed in this paper after describing the actuator structure,\nbraking principle, and mathematical model. The simulation and experimental results showed that\nthe brake actuator responded rapidly, since its response time was only 15 ms. Compared to\ntraditional PID (Proportion Integration Differentiation) methods, the controller proposed in this\npaper is able to regulate the braking force more precisely and has better anti-disturbance\nperformance, thus the braking process can be accurately controlled according to the driverâ??s\ndemand. The vehicle simulation results showed that the braking distance and braking time were\nshortened by 12.19% and 15.54%, respectively compared with those of the conventional anti-lock\nbrake system (ABS) in the same braking conditions....
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