Tag Archives: range

665–675 D. Berjoza, I. Jurgena and D. Bergspics
Solar electric tricycle development and research
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Solar electric tricycle development and research

D. Berjoza¹*, I. Jurgena² and D. Bergspics¹

¹Latvia University of Life Sciences and Technologies, Faculty of Engineering, Motor vehicle institute, J. Cakstes blv. 5, LV-3001 Jelgava, Latvia
²Latvia University of Life Sciences and Technologies, Faculty of Economics and Social Development, Institute of Business and Management Science, Svetes street 18, LV-3001 Jelgava, Latvia
*Correspondence: dainis.berjoza@llu.lv

Abstract:

Due to the fact that the world’s energy resources are declining, various alternative energy sources are being sought. One such source of energy is solar energy. However, due to the large size of solar photovoltaic panels, solar energy is not widely used in mobile vehicles. In some electric automobiles, solar energy is used as an additional energy source, yet usually the sun is not able to provide more than 15–20% of the energy needed for their propulsion. There are some experimental design solutions for water vessels that are propelled by solar energy only. A recumbent electric tricycle was designed, constructed and tested within the present research. The recumbent electric tricycle used a 330 W solar battery, which was designed as a tricycle roof. During the tests with the solar battery, the electric tricycle reached a maximum speed of 32 km h-1. On a sunny day in May under the conditions in Latvia, a distance of 50.20 km was experimentally covered without battery recharging, compared with a distance of 17.14 km covered without the use of a solar battery. By skilfully operating the solar electric tricycle and limiting the speed to 20 km h-1 on a sunny day, the expected distance covered could be unlimited. The acceleration and braking parameters of the solar electric tricycle were identified by using a scientific radar Stalker ATS.

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952–963 D. Berjoza and I. Jurgena
Effects of change in the weight of electric vehicles on their performance characteristics
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Effects of change in the weight of electric vehicles on their performance characteristics

D. Berjoza¹* and I. Jurgena²*

¹Latvia University of Agriculture, Technical Faculty, Institute of Motor Vehicles, 5 J. Cakstes boulevard, LV-3001 Jelgava, Latvia
²Latvia University of Agriculture, Faculty of Economics and Social Development, Institute of Business and Management Science, 18 Svetes str., LV-3001 Jelgava, Latvia
*Correspondence: dainis.berjoza@llu.lv; inara.jurgena@llu.lv

Abstract:

One of the parameters of electric vehicles that can affect their dynamic and range characteristics is their weight. Converting a vehicle with an internal combustion engine into an electric one, it is possible to vary its batteries and their placement. It is also possible to choose batteries of various capacities for serial electric vehicles, for example, Tesla Model S. Not only the costs of electric vehicles but also such performance characteristics as dynamics and travel range per charge depend on the number of batteries and the total weight of the electric vehicles. The research developed and approbated an algorithm for calculating comparative parameters for electric automobiles. The algorithm was approbated on 30 electric automobiles of various makes. Energy consumption per km distance travelled shows the exploitation cost of an electric automobile. According to this indicator, the most economical electric automobiles were as follows: Renault Twizy (67.8 Wh km-1), Tazzari Zero (87.9 Wh km-1) un Renault Zoe ZE22 (93.6 Wh km-1).

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