COT式自動變速器及其換擋特性與控制研究
[Abstract]:Transmission is the key component of the car, which plays a vital role in conventional power, hybrid and pure electric vehicles. For a long time, the automatic transmission has always been in the forefront of automotive technology innovation, from the early three / four block AT, five block AMT, to the present nine / ten block AT, seven / eight block DCT, and the development of automatic transmission is great. In this paper, a kind of Clutch and Overrunning Clutch Transmission (COT) is put forward by using friction clutch and overrunning clutch, and the system dynamics method is used to establish the transmission model. The shift characteristic of the transmission is analyzed and the shift control is put forward. The strategy, simulation calculation and bench test are carried out. The specific work is as follows: first, the structure scheme of CST type automatic transmission is studied. In order to reduce the number of friction clutch in automatic transmission, a knowledge innovation method based on knowledge network and TRIZ theory is put forward, and this method is applied to the knowledge innovation of automatic transmission. A kind of automatic transmission, CST (Clutch and Mechanical Switch Transmission).CST, is divided into two subclasses: COT with outlier transcendent mode and CDT (Clutch and Dog) by outlier mode (Clutch and Dog). The structure layout of the four forms of CST and the three-dimensional structure modeling of some key parts show that CST has the structure feasibility of becoming the automatic transmission. Secondly, the dynamic characteristics of the COT shift process are analyzed. The dynamic model of the transmission system is established with the prototype of the COT mechanism, and the lifting gear and the drop of the transmission are derived. The dynamic equation of the process, the torque calculation model of the engine, the torque calculation model of the wet clutch, the torque calculation model of the overrunning clutch and the calculation model of the resistance moment of the whole vehicle are set up. The simulation model of the whole vehicle dynamics is built with the AMEsim software, and the simulation calculation of the lifting and reducing gear is carried out. On the basis of the simulation research, the simulation of the engine is carried out. The basic dynamic characteristics of the gearshift are analyzed in one step, and then the common characteristics of the gear shift are obtained, that is, no power interruption, rapid shift and torque impact when shifting. Then, the calculation method of the joint impact of the overrunning clutch is carried out. In the process of COT falling gear, the overrunning clutch is automatic. The joint will bring the torque impact to the system, and use the overrunning clutch and overrunning clutch shift test bench to carry out the bench test. Using the Newton mechanics method, the dynamic model of the measured object is set up by the Newton mechanics method. The dynamic finite element method is used to get the shock excitation of the overrunning clutch joining, and the overrunning clutch is joined together. The generated excitation and drive system input torque excitation superposition, calculated the torque and speed response of the transmission output end, and compared with the measured values. Theory and test results show that the input speed has no effect on the engagement impact of the overrunning clutch when the input torque is certain, and the input speed is only to the transmission torque. The change rate and shift time have an impact. Then, the shift control of COT is studied. The overall architecture of the transmission controller is built. Three levels of the control strategy, the middle layer and the upper layer are divided. The key control problems of the COT shift process are analyzed. Based on the analysis results of the shift characteristics, the COT lifting and reducing control is formulated. The simulation results show that the control strategy of lifting and falling gear decreases the absolute value of the shift impact to less than 10 MS-3, and the shift quality is obviously improved compared with the simulation results (15.5 MS-3 and 24.8 MS-3) without control. The shift controller is developed with fuzzy sliding mode variable structure control method, and the comparison simulation between fuzzy sliding mode control method and PID control method is carried out. The simulation results show that the fuzzy sliding mode variable structure control has higher control precision and better anti-interference ability. Finally, the platform test research of COT is carried out. The model is used to verify the CO. The T shift characteristic and the shift control two gear test bench have carried out the lifting and lifting test. The test results show that the lifting gear time is 0.7 s and the drive down time is 0.5 s, which indicates that the COT shift is rapid, which is in accordance with the previous shift characteristic research results. The test results of the lifting gear and the gear reduction control are reduced by 72 respectively than that of the transmission system without the control. .2% and 76.2% show that the shift control strategy is effective. The research work of this paper makes technical preparation for the popularization and application of COT. It provides a new form of automatic transmission for the automatic transmission industry, and provides a complete theoretical reference for the production of more new automatic transmission.
【學(xué)位授予單位】:華南理工大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:U463.2
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