| Powertrain system is an important component of road vehicles, which, To some extent,determines the vehicle’s power, economy, durability, and other important performance. As weknow, a Hybrid car has two or more than two power sources. For this reason, powertrainsystem is even more significant for a Hybrid car. Therefore, people regard the powertrain(drive) system as one of the three key technologies for Electric Vehicles within the industry.A proprietary continuously variable transmission parallel hybrid drive system, which iscalled a novel Hybrid powertrain system based on a double-rotor motor, is considered in thispaper. Theoretical analysis, finite element simulation and laboratory testing and other meansare used to study the dynamic characteristics of the powertrain system. In this paper, theresearch contents are carried out as follows.(1) For the powertrain system, a detailed analysis of its composition and basic operatingprinciples is shown. According to the different working condition of the engine and thedouble-rotor motor, some operating modes are recommended, such as Hybrid driving mode,Hybrid driving&charging mode, pure electric driving mode, mode of braking energyfeedback, mode of parking-charging. Lever Analogy for planetary gear trains is used toanalyze the relationship of torque and speed of the system in different working mode.(2) The two-stage planetary gear trains of the powertrain system are considered. Thepurely torsional dynamic model of the whole system is developed. The reduced-ordereigenvalue problems were derived, using the related parameters of the system, and the naturalcharacteristics of the system is shown in the paper. The vibration modes of the system areclassified into three categories: overall rotational mode, front row planet mode, rear rowplanet mode.(3) After solving and analyzing the natural characteristics of the model under differentcoupling stiffness, a conclusion is verified that the natural frequency of planet modes isrelated to nothing except the mesh stiffness and moment of inertia of the planets. Besides, it isindicated that in overall rotational mode there is no coupling effect between the first-stage andsecond-stage, when the coupling stiffness takes a smaller or larger value.(4) The3D models of housing of the deceleration institution, housing and outer-rotor andinner-rotor of the motor are set up by CATIA. Then model analysis of the structures above arefinished by FEM software-ABAQUS, as a basis for other studies. (5) The finite element model of the double-rotor permanent magnet synchronous motoris set up by Ansoft Maxwell. After defining the properties of the model, solution is done bythe finite element software. The relevant characteristics of the motor under no-load and loadare picked up, and the rationality of the motor design is checked. The experimental programfor the prototype of the motor is established. No-load, load and vibration experiments of theprototype are finished. Analysis and verification of the test results are accomplished.(6) In the Interactive simulation environment of Matlab/Simulink, the simulation modelis built in Simulink, which is based on the mathematical model above. After that, using thetorque ripple of the motor obtained by the experiment and the torque ripple of a car engine asa joint incentive, the vibration response of each component of the system is achieved underdifferent operating conditions. The results showed that the vibration caused by the engine isbigger than that caused by the motor. Considering the excitation sources above, thepowertrain would not be an obvious vibration. |
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