Translated Abstract
With the increasing of the number of cars in the world, the problems of environmental protection and energy crisis are becoming more and more serious. Therefore, the development of new energy vehicles has aroused wide concern. The 2025 Chinese manufacturing plan clearly pointed out the new energy vehicles for the future development of ten key industries, new energy vehicles mentioned here refers to the part of the car with electric propulsion, the broad sense, including the electric vehicle (BEVs), hybrid electric vehicle (HEVs) and fuel cell vehicles (FCEVs). But for the China existing energy structure, pure electric vehicles is not environmentally friendly, fuel cell technology is not the bottleneck breakthrough, so hybrid electric vehicle as a transitional product, in a short period of time there will be a great development. At present, the basic hybrid vehicle technology by foreign monopoly, existing models by series and parallel hybrid power system or hybrid system input split mode, there is a small system efficiency, adapt to the operating range of small, problem of higher requirements on the performance of motor. Compared with the single mode hybrid system, the dual mode system has a wide range of high efficiency transmission ratio and the lower limit of the motor performance. However, the configuration, the complex structure and the control system of the dual mode system make it very difficult to design the new dual-mode system. In this paper, a new type of power split dual mode hybrid power system and its key technical problems are studied. The main contents of this paper include:
The structure and features of the existing hybrid system is analyzed, summarizes the defects and limitations of existing products, demonstrate the superiority of dual-mode power split hybrid system; constructs dynamic model of four nodes by the internal combustion engine, MG1, MG2 and power system output of the proposed model separation and combination method, to determine the new dual-mode system configuration; to establish a parameter optimization model for the highest rate of optimal use of energy, the optimal value of the characteristic parameters of each planetary transmission mechanism; and the rod model for different operation modes of the dual mode system is analyzed in the paper.
Select the TOYOTA PRIUS of this model as the prototype vehicle, according to the design parameters and dynamic index, calculate the vehicle to the power and storage system under different working conditions and mode of the demand, based on the hybrid power system of the engine, the two electric power machine for the calculation of power matching; according to the structure design, parameter the results of optimization and matching of power system, designed by the two groups of planetary gear transmission mechanism, a switch and a motor flux hollow modular axial flux disc motor and other components of the oil electric hybrid power transmission type vehicle; establish a finite element model of the key parts in the prototype, carry out the finite element analysis.
As a result of the initial design parameters, respectively for MG1 and MG2 axial magnetic flux switching motor of disc motor electromagnetic and structural design, establish a finite element model of two motor, simulation, motor stator and rotor flux distribution in the rated output torque, torque ripple on motor results; the rated torque of the hybrid system meet the demands, to the torque ripple minimum as the optimization goal of two motor spacewidth, permanent magnet width and other parameters were optimized to obtain the optimal solution of the structural parameters of the motor.
Establish a system of engine, electric power machine and battery model, on the basis of the design of control strategy based on logic threshold, respectively for the battery SOC value, speed, torque demand set threshold, determined the pattern of switching rules and use Simulink to establish a simulation model of control strategy using AVL-CRUISE and Simulink software; in combination with the vehicle performance of the new hybrid system mode is simulated, the results show that the vehicle 100 kilometers acceleration time within 8s, 100 km combined fuel consumption of less than 4L.
Prototype AFPMDM motor, FSPM motor and two mode hybrid system, namely to build a test platform with driving control and hybrid system simulation experiment for MG2 motor performance test and double motor; of MG2 motor no-load performance test, verify the rationality of the electromagnetic design of AFPMDM motor; starting and speed control performance of AFPMDM motor. Test, test driven AFPMDM motor under different load, verify its starting capability and strong anti disturbance capacity; hybrid system of speed control in electric mode and drive load test, to determine the optimal encoder filter parameters through the contrast test, the proportional gain and integral time parameter KI, verify the motor can stably drive the load capacity at low speed; engine working point optimization control experiment and electronic stepless variable of system. The speed, torque and other parameters of the engine and the two motor generator under different working modes are obtained.
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