| The important direction of developing creative technology in automotive industry all over the world is developing the vehicle with energy conservation and enviroN.mental protection functions, especially electric vehicle and hybrid electric vehicle (HEV), which have already been inevitable choice of sustainable development of automotive industry.With the high power density and high efficiency for the permanent magnet synchronous motor (PMSM), it has become the best competitor in all the type traction motors for hybrid electric car and the trend of motor development in the future. This paper mainly analyzed the characteristics of permanent magnet synchronous motor, combining with the motor's specific needs on hybrid electric vehicle. In order to improve the economy of the vehicle, develop a more reasonable method for matching the motor parameters, hybrid powertrain coordinated control and a comprehensive motor performance evaluation.The paper included the followings:1. Issue related to permanent magnet synchronous motor for HEV.The critical technology for HEV traction motor has been understood through reading plenty of reference documents. The parameter matching and coordinated control ,performance evaluation for traction motor based on permanent magnet synchronous motor features of HEV in this paper were defined as interface issue of traction motor and whole vehicle. The problem was proposed is difference from "traction motor control", it is told that the emphases on this paper was the cross regions between traction motor and HEV, so the research repeatability was avoided.2. Analysis on HEV traction motor performance demands.There are multiply types and structures of vehicle traction motor, so are HEVs. It is necessary to deduce various performance demands of traction motors from the view of improving vehicle driving performance.On the aspects of analogical, digital static and dynamic control performance, The performance indexes of HEV traction motor were qualitatively or quantitatively presented.Besides, The more emphasis on the analysis of constant power region, high efficiency region and overload region of traction motors, and their features and relations were put, among which the relation between basic speed ratio range and constant power region was deduced and proofed in detail. The conclusion was drawed that once the whole vehicle structure was confirmed, then basic speed ratio range of traction motor will be decided. Take Toyota Pruis for example, the influence on fuel economy about efficiency region of traction motor was quantitatively analyzed.The foundation of HEV design and control were established by analyzing on HEV traction motor performance demand.3.Parameter matching of HEV traction motors based on permanent magnet synchronous motor system loss model.A method that parameter matching of HEV traction motor based on permanent magnet synchronous motor system loss model was proposed.This method can not only guarantee the dynamics performance of car, but aslo can improve fuel economy.The PMSM and controller loss model was established, which can calculate the efficiency of motor system rapidly and instantly. Using both whole automotive simulation software ADVISOR and optimization software modeFRONTIER to simulate cooperatively, several typical driving cycle was choosed, such as NEDC, UDDS and china commercial vehicle cycle, to calculator, then optimized performance parameters of motor were determined. At the same time, three motor matching methods were compared on terms of effects on whole automotive economical performance and power. It was proved to be that the matching method based on PMSM loss model and proposed can determine a set of optimized motor parameter in suitable driving cycle, so the control has a certain value in engineering.4.Study on the coordinated control strategy for the HEV based on the motor temperature rise performance.Necessities of HEV dynamic coordinated control are analyzed, so the problem that the performance of traction motor become bad or even self-protection due to temperature rise is summarized into HEV coordinated control strategy.What's more, the Radiate principle of PMSM and motor exotherm effect on torque and efficiency of traction motor were studied in this paper, and the concept of temperature modulate coefficient, was brought up. Based on experience formula and motor test data, not only the vehicle simulation software ADVISOR was further developed, but also thermodynamic model of HEV permanent magnet motor in Matlab/Simulink was established. The coordinated control strategy for the HEV based on the motor temperature rise performance was proposed.Choosing BESTURN HEV edition as simulation platform, and the simulation research on motor temperature rise in 25 UDDS cycle and 27 NEDC cycle was carried. The results proved that the coordinated control strategy proposed in this paper can settle the problem that motor temperature rise highly can lead to lower dynamics performance of the vehicle , also reduced the frequency for motor failure.5.The performance evaluation of traction motor for HEV based on grey relation degree approach to multiple attribute decision making.Assessment and synthesis of various HEV traction motors system influence factor were usually described in mathematical way based on classic set theory, but due to its own limitation, not fit for engineering application. Grey system correlations analyzing theory was the most efficient way to study and solve this problem, which using a small amount of data models, aiming at establishing differential equation model, possessing dynamic and devoted to investigation of reality principles.According to all kinds of traction motor basic performance and HEV working mode demands, this paper prosposed an evaluation flow and established"the three horizontals and the two verticals"assessment index system framework of traction motor system. With reference to the motor body design, motor control and driving cycle of vehicle,considering of methods for test and simlation ,the system adopted multiple attribute decision making grey degree of association algorithm, which equally generalized the index in current assessment framework to the comprehensive performance assessment system.At last,a new comprehensive evaluation method for the traction motor for HEV was established.Take traction motors of hybrid electric bus of FAW for example, an evaluation was proceeded for different type traction motor in the same driving cycle.Take traction motors of BESTURN HEV for example, an evaluation was proceeded for one motor in the different driving cycles.The result proved that the evaluation system established has a favorable applicability.6.Permanent magnetism synchronous motor and HEV bench test.In order to verify HEV traction motor demand performance indicators, Besturn hybrid car traction motor and vehicle bench test were carried out. The proposed permanent magnet synchronous motor performance indicators were as the key points. The results showed that the matching of traction motor performance demand was met. To verify HEV control strategy and control function performance, Besturn hybrid bench tests were based on the NEDC, and the final results show that the basic logic threshold control strategy could meet the requirements of the vehicle. Built a hybrid vehicle virtual test platform which is based on 25 consecutive UDDS virtual test cycle conditions, by running long periods to simulate the temperature rise.What is more , the test results proved that the coordinated strategy based on the traction motor thermodynamic model can decrease motor failure rate .The thesis was the basis for hybrid electric vehicle research and development work. Focus on the performance requirements, design and evaluation methods for the Hybrid electric vehicle traction motor and as the significance that could optimize the vehicle design and control, reduce vehicle costs, and enhance hybrid vehicle market competitiveness.
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