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Electric vehicle has speed vibration problem in Low-speed condition; one of the reasons is that the vehicle power-train resonates with motor's torque ripple in low motor speed. This paper analyzes the reason of motor's torque ripple in low speed; and proposes a method to reduced torque ripple in particular speed that vehicle power-train's natural frequency corresponding to; and builds motor model...
In this paper, an optimization is reported for the determination of time response (Tr) and power (P) of Electric Vehicle. The electric constant of back-electromotive-force, stator d- and q- axes inductances, switching period, battery voltage, stator resistance and torque gear ratio were selected as factors being able to influence the Tr and P. The optimization process was carried out with Doehlert...
The design of a full electric vehicle requires the development and optimization of a complete electric powertrain, including battery, power electronics, electric machine, sensors and control system. When designing an electrical platform, from the very beginning of the V-cycle, it is mandatory to rely on modeling and simulation tools in order to drive the main choices and then to optimize the system...
Electric vehicles are seen as the most promising solution to convert sustainable energy into drive energy. However, there are still some major (technological) challenges, e.g., in terms of maximizing range anxiety, minimizing battery costs and charging time. A possible solution, in order to improve the relative limited range (100-200 km), battery life time and ultimate costs, is utilization, e.g.,...
The design of electrified power trains for use in vehicle propulsion systems is a very difficult topic and thus often discussed in research worldwide. Very much effort has been undertaken to obtain simulation and design tools for entire vehicle development. The designed vehicle has to meet multi-objective criterion where to find an optimum for a specific usage. Facing decreasing resources of fossil...
50 “zero emission” pure electrical buses BK6122EV have been running in Beijing for the whole year. As one of the core systems of the bus, the automatic mechanical transmission (AMT) has the enormous influence on its economical performance. In order to further optimize the economic gear-shifting schedule for BK6122EV, this paper uses three design methods of the conventional engine vehicle for reference,...
Our endeavor in this paper is to provide a reliable, efficient and intelligent module which would satisfy two purposes: (1)automatic transmission (AT); and (2)vehicle for specially abled (VFSA), is module would be associated with the automobile in the case of AT. In case of VFSA the module will be helpful for transportation of these people in a separately designed vehicle.The basic principle we use...
This paper presents a design procedure of hardware-in-the-loop (HIL) for electric vehicle powertrain system modeling and simulation. First, simulation is performed in MATLAB/Simulink platform. Then, an electric vehicle powertrain hardware-in-the-loop system including BMS (battery manage system), MCU (motor control unit) and VMS (vehicle management system) is built based on the dSPACE with MATLAB/Simulink,...
In this paper, based on a battery pure electric city bus, principle researches have been offered on the parameters matching of the power-train and main components. The vehicle system was designed integrated, and then simulation platform was developed and established. The dynamic and economy performance can be predicted based on the above work, results show that the designed pure electric city bus...
As for clutch control during automatic mechanical transmission (AMT) starting, it is difficult to design an effective and adaptive control strategy. Aiming at it, an improved constant engine speed control strategy is adopted as a total control principle, and on basis of it a new fuzzy control strategy using throttle opening, relative deviation between engine speed and its target and engine speed change...
Two-speed transmission system is usually employed by an electric vehicle to improve efficiency of an electric driving system and drivability of vehicle powered solely by electric power, i.e. pure electric vehicle, or series hybrid electric vehicle. The improvement of the drivability and efficiency due to the application of the multi-speed transmission system is shown based on motor drive system characteristics,...
The General Motors (GM) EV1 is an electric vehicle originally powered by either a PbA or NiMh battery pack. This paper examines the possibility of alternative powertrain configurations. These alternatives include an ultracapacitor (UC) storage system, fuel cell system with UC storage, and a fuel cell system with a NiMh battery pack. The configurations were simulated using ADVISOR. Parametric tests...
Various types of electric vehicles have been developed so far, including pure electric car, serial/ parallel hybrid electric car and serial/ parallel hybrid electric bus and so on. Traditionally, a controller is designed for a particular type of electric vehicle. However, on the basis of CAN bus, powertrain controller platform is currently being developed to meet the demand of different electric vehicles...
Because of lower fuel consumption and emissions, especially unlimited drive mileage, hybrid electric vehicle (HEV) has long term potential for future main stream vehicle. Based on conventional vehicle CHERY A5, this paper analyzes the framework of powertrain and control strategy of the parallel hybrid electric vehicle. A method of powertrain parameters matching is presented. On the basis of engineering...
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