Research On Calibration Technique Of Mode-switch Control Parameters Of A Multi-section Mechanical-electric Transmission System

With the rapid development of auto mobile industry and energy consumption increased, new energy vehicles has become a national research focus. Because of the high energy ratio, energy-saving and other advantages, hybrid-electirc vehicles become the most promising new energy vehicles at the present stage. This article is going to research on a Multi-section Mechanical-electric Transmission System, in witch the engine and two motors are coupled through a planetary institution. Compared with the traditional mechanical-ecletric transmission system, the power demand of the motors is greatly reduced. But it also brings about some problems like the switching between different working modes.Based on a Multi-section Mechanical-electric Transmission System, research on the control method of the mode-switching process. The study includes the system modeling, the calibrating method for the switching process control parameters and the simulation analysis. The main achievements are as follows.Firstly, the speed and torque relationship of the coupling mechanism and the working state of the main control components are analyzed in the different working mode of the Multi-section Mechanical-electric Transmission System. The mode-switch processes are divided into ‘section-switch process and ‘shift process’. The working state changes of the engine, motors and the clutches are analyzed, so as the control object of the mode-switch process is clear. The foundation for the study of control process has been laid.Taking the mode switching process as the key research object, the model of the Multi-section Mechanical-electric Transmission System is built in Simulink. The parameters of the speed control system for the diesel engine are obtained using the system identification method. The hydraulic sontrol system for the clutches is built based on Simhydraulic. The dynamic characteristics of the mechanism in the mode-switch process are well reproduced.The influences of the clutch pressure, the speed and torque of the engine and motors on the system are studied, and select the appropriate control parameters. The control strategy of zero speed difference for the mode-switch process is presented. Formulate a complete calibrate method for the control method aiming at the dynamic, comfort and life span of the system.An open loop control strategy for multi operating conditions is formulated. Based on this strategy, the control parameters of the mode-switch process are calibrated under various working conditions. The simulation results have shown that the control parameter calibration process is feasible. And the control strategy has achieved its function. The mode–switch can be completed within 0.5 second, and the power and life span of the system are improved significantly.