Font Size: a A A

Parameters Design Of Hybrid Vehicle And Simulation Research On Motor Control System

Posted on:2004-11-23Degree:MasterType:Thesis
Country:ChinaCandidate:B PuFull Text:PDF
GTID:2132360095456989Subject:Vehicle Engineering
Abstract/Summary:PDF Full Text Request
The development of automobile industry induces increasingly serious problems of environment pollution and the scarcity of oil source, so it is imperious to seek for a new technology of saving energy, reducing the exhaust emission of automobile and the replaceable material. The electric vehicle (EV) is the best method to solve these both problems, but its development is currently limited by no breakthrough in battery evolvement. Having the characters of low pollution and low oil-consumption, the hybrid electric vehicle (HEV) is an ideal choice to solve these existing problems at present. Therefore, the investigations on HEV become new hotspot in the field of international and national automobile. Based on the basic analysis of the structure and power elements of the hybrid vehicle, this thesis presents a powertrain system with a metal pushing belt CVT, aiming to the development status and trend of the hybrid vehicle technology in our country. A rational control strategy and its work mode of this powertrain system are determined, and correlative parameters such as the engine power, the starting torque, and the differential ratio, the rated power and torque of the motor, and the ratio of the torque synthesizer are systematically designed for the Changan Star 6350B. At the same time, the design of these parameters is considered as the base of the simulation of the motor control system in next step. As a key technology, the motor control technology plays an important role in developing the hybrid vehicle. It ensures to not only meet with all kinds of modes of the vehicle, but also improve fuel economy and dynamic performance. On the basis of the principle of Direct Torque Control, a control strategy of the grade of errors for induction motor has been proposed to improve the performance of powertrain system of hybrid vehicle in this thesis. The stator flux error, electric magnetic torque error and flux position angle are considered as control variables, and the switching states are determined by the control rules of the Direct Torque Control. Thereby this approach can acquire the faster response of the electric magnetic torque without the plenty of calculations. Another key technology is to realize the power switching steadily. According to accelerator pedal angle and accelerator pedal angle ratio, and fueleconomy and dynamic performance,the time for power switching is determined. Then, based on the target torque required by the automobile easement, power switching steadily is obtained. After synthesizing the above information, the control strategy on power switching steadily is achieved in this thesis. The dynamic mathematical model of the motor and the whole powertrain model were built to verify the validity of the strategy in the above. At last, the starting mode of single motor, the driving mode of single motor, the driving mode of single engine, and the driving mode of hybrid power were simulated for the Changan Star 6350B, and the result of the simulation is compared with the prototype CVT. Results show that the presented control strategies are ideal for hybrid vehicle, which can make the motor generate the electric magnetic torque efficiently, steadily and quickly. And dynamic performance of whole vehicle is largely increased to achieve the related technology requirements. This investigation provides a theoretic foundation for the development of the hybrid vehicle.
Keywords/Search Tags:hybrid vehicle, powertrain transmission system, parameter design, motor control strategies, power switching strategy, modeling, simulation
PDF Full Text Request
Related items