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Proceedings ArticleDOI

Performance enhancement of electronic differential in electric vehicles using a novel wavelet controller

01 Dec 2014-pp 152-157
TL;DR: Modelling and simulation of an electronic differential employing a novel wavelet controller for two brushless DC motors ensuring the drive of the two rear wheels and comparison with conventional controllers like PID has been presented.
Abstract: Differential in a transmission system plays an important role of preventing the vehicle from slipping on curved roads. Mechanical differentials are heavy and bulky and are not suitable for electric vehicles especially those employing separate drives for both the rear wheels. Electronic differential constitutes a technological advance in electric vehicle design enabling better stability and control of the vehicle on curved roads. This paper presents modelling and simulation of an electronic differential employing a novel wavelet controller for two brushless DC motors ensuring the drive of the two rear wheels. The proposed controller uses discrete wavelet transform to decompose the error between actual and command speed as given by the electronic differential based on throttle and steering angle as the input into frequency components. These frequency components are scaled by their respective gains to generate a control signal which is given as input to the motor. To test the system, several simulations were carried out viz. vehicle on a straight road and vehicle driven on a road turning right and left. The results and comparison with conventional controllers like PID has been presented.
Citations
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Proceedings ArticleDOI
Yiming Cui1, Yi Shen1, Xin Zhang1, Yan Wang1, Miao Zhang1 
23 May 2016
TL;DR: The results of curve fitting differential ratio after de-noising and filtering give a strong evidence of the effectiveness of the method and guide the electric differential control for electric vehicles in practice.
Abstract: The differential devices are of vital importance for a car on its performance. Traditionally, the problem of differential control is solved by mechanical devices. Compared to mechanical devices, electric differential systems have many advantages but the control of electric differential is complex. A strategy of electric differential control for electric vehicles is presented in this paper. The method of using the data acquired by measurement for curve fitting is proven to be an effective way to solve the electric differential problem. Since the data got by measurement are mixed with noises, it is inevitable that the process of de-noising and filtering is required. Compared to Fourier transform and wavelet transform methods, Empirical Mode Decomposition method can extract the useful signals much better. The results of curve fitting differential ratio after de-noising and filtering give a strong evidence of the effectiveness of the method and guide the electric differential control for electric vehicles in practice.

1 citations


Cites background from "Performance enhancement of electron..."

  • ...What’s more, the electric vehicle is smaller in volume and lighter in weight[2]....

    [...]

Proceedings ArticleDOI
20 Oct 2022
TL;DR: In this paper , the authors proposed a new solution for the replacement of the traditional (mechanical differential) with an electronic differential based on the use of dual motors with axial flux PMSM.
Abstract: Today, power electronics and digital computing together with electric drives technology are enabling new solutions for more controllable and efficient transportation systems. In this paper, we propose a new solution for the replacement of the traditional (mechanical differential) with an electronic differential based on the use of dual motors with axial flux PMSM. The control method of the two axial flux PMSM rotors is based on a direct flux and torque method. The direct torque and flux control method applied to the axial flux PMSM machine is capable of providing the necessary dynamical performance during transient regimes.
Proceedings ArticleDOI
20 Oct 2022
TL;DR: In this article , the authors proposed a new solution for the replacement of the traditional (mechanical differential) with an electronic differential based on the use of dual motors with axial flux PMSM.
Abstract: Today, power electronics and digital computing together with electric drives technology are enabling new solutions for more controllable and efficient transportation systems. In this paper, we propose a new solution for the replacement of the traditional (mechanical differential) with an electronic differential based on the use of dual motors with axial flux PMSM. The control method of the two axial flux PMSM rotors is based on a direct flux and torque method. The direct torque and flux control method applied to the axial flux PMSM machine is capable of providing the necessary dynamical performance during transient regimes.
References
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Journal ArticleDOI
TL;DR: In this paper, a compression technique for power disturbance data via discrete wavelet transform (DWT) and wavelet packet transform (WPT) is introduced, which is performed through signal decomposition up to a certain level, thresholding of wavelet coefficients, and signal reconstruction.
Abstract: This paper introduces a compression technique for power disturbance data via discrete wavelet transform (DWT) and wavelet packet transform (WPT). The data compression leads to a potential application for remote power protection and power quality monitoring. The compression technique is performed through signal decomposition up to a certain level, thresholding of wavelet coefficients, and signal reconstruction. The choice of which wavelet to use for the compression is of critical importance, because the wavelet affects reconstructed signal quality and the design of the system as a whole. The minimum description length (MDL) criterion is proposed for the selection of an appropriate wavelet filter. This criterion permits selection not only of the suitable wavelet filter but also the best number of wavelet retained coefficients for signal reconstruction. The experimental study has been carried out for a single-phase to ground fault event, and the data compression results of using the suitable wavelet filter show that the compression ratios are less than 11 % and are reduced to more than a half of that percentage value by implementing an additional lossless coding.

175 citations

Proceedings ArticleDOI
03 Jun 2009
TL;DR: In this paper, a new electronic differential control approach for a two-in-wheel-motor drive EV is devised based on the fuzzy logic control method, which employs to estimate the slip rate of each wheel considering the complex and nonlinear of the system.
Abstract: In-wheel-motor drive electric vehicle (EV) is an innovative configuration, in which each wheel is driven individually by an electric motor. It is possible to use an electronic differential (ED) instead of the heavy mechanical differential because of the fast response time of the motor. A new ED control approach for a two-in-wheel-motor drive EV is devised based on the fuzzy logic control method. The fuzzy logic method employs to estimate the slip rate of each wheel considering the complex and nonlinear of the system. Then, the ED system distributes torque and power to each motor according to requirements. The effectiveness and validation of the proposed control method are evaluated in the Matlab/Simulink environment. Simulation results show that the new ED control system can keep the slip rate within the optimized range, ensuring the stability of the vehicle either in a straight or a curve lane.

55 citations

Proceedings ArticleDOI
01 Nov 2008
TL;DR: The implementation of a neighborhood electric vehicle with two independent wheel drives is presented in this paper, where an electronic differential control is carried out by using two independent field-oriented controlled induction motors.
Abstract: The implementation of a neighborhood electric vehicle with two independent wheel drives is presented An electronic differential control is carry out by using two independent field-oriented controlled induction motors Industrial standard induction motors were rewound to operate with low voltage (28 Vrms), while maintaining the original motor power Two three-phase MOSFET inverters were built for these motor power requirements The whole system is controlled using a single digital signal processor, TMS320F2812 Experimental results for different vehicle maneuvers are presented validating the right traction control operation

30 citations

Proceedings ArticleDOI
13 May 2013
TL;DR: In this paper, the authors proposed an electronic differential that will offer the best stability of vehicle in the curved road by using two permanent magnet synchronous (PMS) machines that ensure the drive of two back-driving wheels.
Abstract: In this paper, we model an electronic differential that will offer the best stability of vehicle in the curved road The use of electronic differential constitutes a technological advance of vehicle design along the concept of more electric vehicles Electronic differential have the advantages of replacing loosely, heavy and inefficient mechanical transmission and mechanical differential with a more efficient, light and small electric motors directly coupled to the wheels via a single gear or an in-wheel motor To date, electronic differentials have been proposed for two and four wheeled vehicles The proposed traction system consists of two permanent magnet synchronous (PMS) machines that ensure the drive of two back-driving wheels The proposed control structure is based on the direct torque control for each wheel-motor Different simulations have been carried out: vehicle driven on straight road, vehicle driven on straight road with slope, and vehicle driven over a road curved left and right The simulation results show good vehicle stability on a curved road

20 citations


"Performance enhancement of electron..." refers methods in this paper

  • ...The rotor speed is determined by the electronic differential based upon the input speed and steering angle [4]....

    [...]

Proceedings ArticleDOI
01 Sep 2007
TL;DR: In this paper, the authors present a new fully integrated control system in a System-on-Chip (SoC) suitable to implement the controller for a Neighbourhood Electric Vehicle (NEV) based on FPGA (Field Programmable Gate Array) technology.
Abstract: In this paper we present a new fully integrated control system in a System-on-Chip (SoC) suitable to implement the controller for a Neighbourhood Electric Vehicle (NEV) based on FPGA (Field Programmable Gate Array) technology. A prototype has been designed specifically to meet the requirement of low cost and it contains all of the active functions required to implement the electronic differential. The controller uses Field Oriented Control (FOC) techniques with offline parametric identification of the motors to enhance its performance. A PC based user interface allows easy controller configuration, data acquisition and performance analysis. The functionality of the electronic differential is verified through experiments with a bench test equipment equivalent to the actual system. The experimental results show that the proposed controller is able to follow the reference torque and curvature angle with a good dynamic and relatively low error.

14 citations