Guangdong Automotive Engineering Key Laboratory

Guangzhou, China

Guangdong Automotive Engineering Key Laboratory

Guangzhou, China
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Luo Y.,South China University of Technology | Luo Y.,Guangdong Automotive Engineering Key Laboratory | Zhang G.,South China University of Technology | Zhang G.,Guangdong Automotive Engineering Key Laboratory | And 4 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2010

A novel hybrid drivetrain based on electromagnetism continuously variable transmission (EMCVT) is studied and its power flow model is put forward. The EMCVT's speed ratio control , working models and control strategy are researched. The controller framework of hybrid electric vehicle(HEV) drivetrain is designed. The preliminary dynamic performance simulation on low speed and heavy load condition and high speed condition of HEV is carried out. Through simulation, the control effects of vehicle speed tracking and engine speed tracking are analyzed, and the variation curve of battery charge state, the variation rules of the rotating speed and torque of the EMCVT, the engine output power, the battery output power, and the driving resistance power are obtained. Moreover, the variation rule of observed values of magnetic links of direct current excitation and EMCVT are obtained. © 2010 Journal of Mechanical Engineering.


Luo Y.,South China University of Technology | Luo Y.,Guangdong Automotive Engineering Key Laboratory | Chen Y.,South China University of Technology | Chen Y.,Guangdong Automotive Engineering Key Laboratory
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2012

A power coupling system with two-stage planetary gear trains is considered, which is a part of a novel hybrid power train system based on a double-rotor motor. Many fundamental factors are taken into account, such as mesh stiffness of gear pairs of the two-stage planetary gears, torsional stiffness of the central parts, torsional coupling stiffness of the connecting section, inertia of the system, etc. Purely torsional dynamic model of the coupling system is developed. The reduced-order eigenvalue problems are derived by using the related parameters of the system, and the natural characteristics of the system is shown. The vibration modes of the system are classified into three categories: overall rotational mode, front row planet mode, rear row planet mode. In overall mode, the natural frequency is a simple root and each part of the system has torsional vibration to some extent. However, the natural frequency is a double root in the other two modes and no part of system vibrates except the planet gears. It's found that the vibration mode characteristics agree with those of the literatures. The impact of coupling stiffness to natural characteristics of the system is point out, and preliminary analysis is proposed. © 2012 Journal of Mechanical Engineering.


Ding K.,South China University of Technology | Ding K.,Guangdong Automotive Engineering Key Laboratory | Chen L.-D.,South China University of Technology | Yang Z.-J.,South China University of Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

A new method was proposed to improve the precision of spectrum correction for a damped free vibration signal based on frequency-domain. The principle of this method was that a continuous, and damped free vibration signal was sampled and its analytical signal was constructed, then N points fast Fourier transformation (FFT) was performed to the analytical signal from its starting data point to the (N+1)-th data point. Finally, the modal parameters were calculated using the parameters of two corresponding peaks of amplitude spectra. This method could reduce the spectral leakage of negative frequency component caused from FFT. Simulation results showed that the precision of spectrum correction can be rather high when natural frequencies are far from each other; however, the method cannot be used if natural frequencys are very close to each other or the modal coupling is very serious.

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