Development Of All Electric Vehicle (XH-I)

The two-seat electric vehicle(EV) is taken as the study object in this thesis. Focus on the key technologies of the two-seat electric vehicle such as Vehicle Control(VC) technology, typical conditions control strategies and control system communication network, mechanical structure of the vehicle and transmission system, the portion of system simulation analysis, to achieve the control functions of the vehicle controller and relevant experimental study are carried out on these technologies in this thesis.In order to design VC of the EV, first of all, the drive and control systems as well as layout of the two-seater EV has been designed and selection. When study on the operating characteristics and drive control principle of the selected monitor, after analyzing the mathematical model of its control method, the Direct Torque Vector Control model based on PID of three-phase asynchronous AC motor is established using MATLAB/Simulink tools. And to verify the control effection via simulation, the simulation results demonstrate that, the method of Direct Torque Vector Control has a good control effection on the selected motor. It is to provide some reference for formulation the control strategies of vehicle controller.Mechanical structure of the two-seater EV has designed after general arrangement of vehicle established, in order to realize the vehicle’s design. Based on the surveying and drawing as well as comprehensive analysis for purchased components, focus on the design of the gear and intermediate shaft from main reducer of the transmission system, and checked the static intensity of gear and intermediate shaft.In order to solve the problem of data communication between the vehicle controllers in this issue, the CAN communication protocol for the control system was formulated on the basis of referring to the J1939standards. In the study, the PF autoCAN software is used to establish communication network database and define the function of each node. The simulation and analysis of the communications network system is done. The result validates the application layer protocol specification and node functions. Vehicle LCD instrument was designed by using configuration screen. The result of communication test verify the display function of LCD instrument via the network node.To achieve real-time control of the controller to the two-seater vehicle electric vehicles under different conditions, according to the actual operating conditions of electric vehicles, this paper launched a control strategy study based on conditions, then the vehicle control model was established with the model-based, and the loop simulation platform was established as well, the simulation verification of the control algorithm was got, as laid a theoretical foundation to the hardware implementation of vehicle control. On the basis of theoretical analysis and simulation experiments of the vehicle control strategy in the previous stage, the vehicle controller hardware solutions were set, and MC9S12XS128was designed as the core control chip to vehicle controller hardware circuit, including the minimum system circuit, the drive control circuit and the peripheral interface circuit. According to the vehicle control strategy formulation, the vehicle controller software code was got with the structured and hierarchical software design methods. Finally, the vehicle controller was installed in the car, and some preliminary tests were done to verify the validity and correctness of the vehicle controller.