IJERT-Modelling and Analyzing Electric Vehicles with Geared Transmission Systems: Enhancement of Energy Consumption and Performance (original) (raw)
2013, International Journal of Engineering Research and Technology (IJERT)
https://www.ijert.org/modelling-and-analyzing-electric-vehicles-with-geared-transmission-systems-enhancement-of-energy-consumption-and-performance https://www.ijert.org/research/modelling-and-analyzing-electric-vehicles-with-geared-transmission-systems-enhancement-of-energy-consumption-and-performance-IJERTV2IS110249.pdf The main aim of this paper is to study the potential impacts in performance and energy consumption by utilising a geared transmission in electric vehicle driveline. This is achieved by modelling and analysing the powertrain of a generic electric vehicle using Matlab/Simulink-QSS Toolkit, with and without a transmission system of varying levels of complexity, to investigate whether the addition of a gearbox results in significant values of predicted efficiency gains. Predicted results are compared for a typical electrical vehicle (EV) in three cases: without a gearbox, with a continuously variable transmission (CVT), and with a conventional stepped gearbox. Predictions are made over the standard driving cycles. One of the critical features in this paper is the usage of the electric motor in its region of high efficiency. Consequently, two motors are modeled in this work in order to understand the sensitivity of the results to the assumptions about motor efficiency maps. These motors will be referred to as a theoretical motor derived from generic equations and a practical motor which is effectively a look-up map from the manufacturers’ data. The results showed that it is possible to improve overall performance and energy consumption levels using a continuously variable ratio gearbox.
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