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Lu H.,Tsinghua University | Cheng X.,Eaton Corporation | Qu W.,Tsinghua University | Sheng S.,Tsinghua University | And 2 more authors.
IEEE Transactions on Power Electronics | Year: 2014

Three-phase current reconstruction technique using dc current information in conventional two-level inverters can be used for the purpose of cost reduction and sensor fault tolerance. A novel phase current reconstruction scheme, with reduced immeasurable area and common mode voltage, is proposed in this paper. A tristate pulse-width modulation technique has been employed, in which three adjacent switching states are used to construct the reference voltage. The active switching states are arranged at the edge and the center of a PWM cycle. Fixed sampling and simultaneous three-phase currents can be easily achieved with very little hardware and software requirements. A detailed analysis of the effects of nonidealities leads to regional modifications of the switching sequence resulting in almost the whole hexagon as the feasible area. The usefulness of the proposed reconstruction algorithm has been verified by experimental results obtained from a 4-kW induction motor drive system. Smooth transitions between the redundant and fault-tolerant modes were observed. © 1986-2012 IEEE.

Chen Y.,Tongji University | Li X.F.,Hunan CSR Times Electrical Vehicle Company | Qu T.,Tongji University
Applied Mechanics and Materials | Year: 2013

The research came up with a road adhesion coefficient estimation method for electric vehicle under tire cornering condition, compared with the previous researches that mainly focused on tire longitudinal behaviors. The designed identification method first distinguishes the states of small longitudinal slip and large longitudinal slip in the condition of tire cornering. Then estimation algorithms for the two conditions above operate respectively. By designing the simulation and selecting typical road conditions, the applicability and validity of the algorithm have been verified. The estimation method can be used to serve the electric vehicle's dynamics stability control system. © (2013) Trans Tech Publications, Switzerland.

Wang B.-L.,Shaoyang University | Wang B.-L.,Hunan Tyen Machinery Co. | Pei H.-L.,Hunan CSR Times Electrical Vehicle Company | Tang W.-X.,Shaoyang University | Shi M.-L.,Hunan HuaYuan Secondary Vocational and Technical School
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2013

Aimed to coordination of the multi-injection control strategy in high pressure common rail injection system, on the basis of function analysis of multi-injection and considering fully various ambient conditions and engine operation conditions, a multi-injection coordination control strategy of pre, main and post injections was worked out. The control algorithm of multi-injection coordination controller was designed and experimented on certain diesel engine and sport utility vehicle. Results show that the multi-injection coordination control is successfully realized by the strategy designed in different engine operation conditions.

Huang G.,Central South University | Huang G.,Hunan University of Technology | Luo Y.-P.,Central South University | Zhang C.-F.,Hunan University of Technology | And 2 more authors.
Sensors (Switzerland) | Year: 2015

This paper proposes a current sensor fault detection method based on a sliding mode observer for the torque closed-loop control system of interior permanent magnet synchronous motors. First, a sliding mode observer based on the extended flux linkage is built to simplify the motor model, which effectively eliminates the phenomenon of salient poles and the dependence on the direct axis inductance parameter, and can also be used for real-time calculation of feedback torque. Then a sliding mode current observer is constructed in αβ coordinates to generate the fault residuals of the phase current sensors. The method can accurately identify abrupt gain faults and slow-variation offset faults in real time in faulty sensors, and the generated residuals of the designed fault detection system are not affected by the unknown input, the structure of the observer, and the theoretical derivation and the stability proof process are concise and simple. The RT-LAB real-time simulation is used to build a simulation model of the hardware in the loop. The simulation and experimental results demonstrate the feasibility and effectiveness of the proposed method. © 2015 by the authors; licensee MDPI, Basel, Switzerland.

Zhang C.,Hunan University of Technology | Huang Y.,Hunan University of Technology | Huang Y.,Hunan CSR Times Electrical Vehicle Company | Shao R.,Hunan University of Technology
Journal of Control Theory and Applications | Year: 2012

Current sensor is one of the key elements in the control system of induction motor. Whether the accurate measurement of variables reflecting motor operation status can be made will directly affect the control effect on motor system and therefore the timely, accurate detection of sensor fault is necessary. This paper brings forward an observerbased method of residual generation and fault detection on the basis of the mathematical model of the induction motor. As whether or not the nonlinear part satisfies the Lipschitz conditions does not limit the observer design, the application of such an observer is expanded. Meanwhile, the contradiction between robust error and fault sensitivity is also settled. The correctness and effectiveness of such method are verified by experimental testing on the simulated fault which also casts light on engineering practice. © 2012 South China University of Technology, Academy of Mathematics and Systems Science, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.

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