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This document reflects the work done to design a torque control strategy for an axial flux switched reluctance machine. The electrical model is first presented but as the switched reluctance machine behaves nonlinearly a finite element method characterization is performed. Once the machine is characterized a Simulink model is developed where a torque control strategy is proposed.
Coasting is a fuel-saving driving mode that is usually active when the vehicle slows down. In an electric vehicle (EV), coasting can be achieved by letting the q-axis current to be set to zero. However, braking action often occurs at high speeds when the gas pedal is tipped off. That is, negative torque is produced while the q-axis current is equal to zero. Such a braking torque reduces the coasting...
The lightweight, integrated, and high performance motor-wheel driven electric vehicle is clean, energy saving, and safe, and has the potential to form the ideal electric vehicle for the future. This paper proposes an optimal fuzzy neural network braking control strategy to determine the allocation of the front and rear regenerative braking torque and friction braking torque for the independent four...
The electric drive system is one of the most important parts of electric vehicles (EVs), whose function is the conversion between electric energy and mechanical energy. Switched reluctance motor (SRM) has the features of simple construction, high starting torque, wide speed range, high efficiency and high reliability which are appropriate for EVs drive system. Firstly, instantaneous torque control...
Switched reluctance (SR) motors have many advantages such as simple and solid construction, low-cost on manufacturing, excellent reliability at high temperatures, and large torque density. However, the higher torque ripple from magnetic saliency is a serious problem preventing its applications from being expanded. Several torque control methods have been already proposed. In practical use, a controller...
Various simulation models are set up and Maximum torque per ampere (MTPA) control strategy of PMSM is proposed on the basis of closed torque loop control in this paper. First the model of electric vehicle(EV) is set up based on a series of analyses and mathematical models. Second the model of PMSM is set up based on a series of analyses and mathematical models. Third the detailed simulation analyses...
Drive technology and Control System of Electric Vehicle with TMS320LF2407A DSP as microcontroller are mentioned in this paper. The system takes permanent magnet syncronous generator as the driving motor, utilizing the direct torque control technology of SVPWM. Electric Vehicle are rearly driven by two wheels, which only needs to control one permanent magnet syncronous generator, and then it will be...
The control of SRM was discussed: current chopping control, angle position control. This paper presents a inverter circuit and a fuzzy sliding mode control method to minimize the torque fluctuation and noise of the SRM. Based on the experimental results, Using the inverter circuit and fuzzy sliding mode control method can effectively minimize the torque fluctuation and noise of the SRM, For the switched...
A three-phase squirrel-cage induction motor is used as a propulsion system of an electric vehicle (EV). The motor is controlled at different operating conditions using a direct torque control (DTC) technique known to have simple control structure with comparable performance. Whereas in a conventional DTC drive, the weakest points is the optimal voltage space vector choice. In this paper Artificial...
Direct Torque Control is a control technique used in AC drive systems to obtain high performance torque control. The conventional DTC drive contains a pair of hysteresis comparators, a flux and torque estimator and a voltage vector selection table. The torque and flux are controlled simultaneously by applying suitable voltage vectors, and by limiting these quantities within their hysteresis bands,...
Multiphase electric drives have been recently proposed for applications where the highest overall system reliability and power distribution per phase are required. The propulsion drive of an Electric Vehicle (EV) is one of these applications. Direct Torque Control (DTC) methods are normally used in conventional AC drives when fast electrical dynamic performance is required, like in electric propulsion...
The electric vehicles need high efficient torque control system. Therefore, this paper proposes the novel excitation interval control method. The excitation intervals are concentrated around the rotor position where the derivative of inductance becomes maximum values. The efficiency of proposed method is superior to the efficiency of conventional methods.
Multiphase electric drives have been recently proposed for applications where the highest overall system reliability and power distribution per phase are required. The propulsion drive of an Electric Vehicle (EV) is one of these applications. This paper deals with the use of a five-phase induction machine in the propulsion module of EVs, where the viability of a Predictive Torque Control method (PTC)...
In this paper, a new type vehicle with four wheel independent steering (4WIS) and four wheel independent driving (4WID) travelling mechanism is designed. Under careful analysis of the advantages and disadvantages of both the mechanical and electrical features, the design of platform is discussed. Besides, a corresponding control structure is addressed. Under the Co-simulation using ADAMS and MATLAB/Simulink,...
In the paper, the micro-step method based on the phase current aiming to reduce the torque ripple is proposed. The SRM driving system used in the electric vehicle is presented by TMS320LF2407 as main controller. The hardware circuit and the software block diagram is presented. The system adopted the novel torque vector control strategy, it can effectively reduce the torque ripple. The result from...
Mitsubishi Motors Corporation succeeded in mass-production of the new generation electric vehicle “i-MiEV” which was released into the Japanese market in July 2009. This vehicle features leading-edge technologies epitomized by lithium-ion battery. In this paper the power management systems are focused on. Following an introduction of some features of this EV, requirements for the control systems are...
A novel power assisted steering system based on differential drive torque of the right and left steerable driving wheel was proposed, owing to the driving characteristics of four-wheel-independent-driving electric vehicle, the basic theory and structure of Driving Force Power Steering(DFPS) is explained in detail. Subsequently, electric vehicle with motorized wheels dynamics model based on AMESim...
In this paper, vehicle state variables and bank angle estimation for rolling stability control (RSC) is proposed using one accelerometer and two gyro sensors, instead of using inertial navigation system (INS) or global positioning system (GPS). We proposed a novel robust RSC for in-wheel motor electric vehicle (IMEV) using differential torque by right and left motors which are controlled independently...
Direct yaw-moment control (DYC) is an effective method to make vehicle motion stable. In the DYC of vehicles having in-wheel motors and both active front steering system and active rear steering system, the control input generally has redundancy. The input variables can not be decided uniquely to generate the same yaw-moment. The equalization of workload for each wheel by the longitudinal force and...
Battery-powered electric vehicles may capture regenerative energy to extend driving range. However, while larger regenerative braking torque attains more regenerative power, excess braking torque may lock up the wheel and result in safety issues. In effect, maximization of the regenerative torque and in turn the energy recapture is subject to the safety requirements. This paper translates the energy...
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