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Analysis of power requirement of a prototype four-wheeled electric vehicle under different off-road conditions 1Department of Agricultural Machinery Engineering, Graduate School, Chungnam National University, Daejeon, Republic of Korea Abstract A variety of vehicles have been used for multifunctional agricultural works. Most of the agricultural vehicles are high-powered and inconvenient for aged and female farmers in difficult farm conditions due to irregularities, slopping roads, and slippery of wheels. Therefore, the objective of the study was to evaluate the power requirement of a 4 wheeled electric vehicle (4WEV) according to the different off-road conditions. The experiment was conducted under typical Korean farm roads. The parameters of the vehicle were assessed, considering loading-unloading and sloping conditions. The data were obtained at the 5, 10, and 15 degree slopes condition with 100, 300, and 500 Kg loads. The motor rotational speeds of the electric vehicle were 2000, 2800, and 3400 rpm to determine the torque of the wheels during the experiment. The average maximum required power was recorded 0.84 st.dev. 0.025, and 0.85 st.dev. 0.087 kW at 500 kg load with 15 degree slope, and the minimum power was 0.29 st.dev. 0.023, and 0.31 st.dev. 0.069 kW at the same loading condition without slope at 70 rpm wheel speed on concrete and asphalt road, respectively. Alternatively, 60 rpm and 50 rpm wheel speed showed the maximum and minimum power at the 15 degree and no slope conditions during the experiment. According to the analysis of power requirements, the maximum power was varied with various loads and rotational speeds under the different off-road conditions. The developed electric vehicle produced satisfactory power to run the vehicle without interruptions in various sloped and loaded conditions. Keywords: Electric vehicle, Dryland, Off-road, Sloppy land, Power requirement Topic: AGRICULTURAL ENGINEERING |
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