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Study on Ratio Control for Metal V-belt Continuously Variable Transmission

Author: ChenWeiSheng
Tutor: XueDianLun
School: Hunan University
Course: Vehicle Engineering
Keywords: CVT Speed ??Ratio Control Electro-hydraulic control system Time delay algorithm
CLC: U463.212
Type: Master's thesis
Year: 2008
Downloads: 254
Quote: 8
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Abstract


CVT CVT (Continuously Variable Transmission) as the ideal automobile variable speed transmission , has broad prospects for development and market space . Compared with the currently widely used in the automatic transmission , it has the advantages of excellent performance, simple structure, and can achieve a continuous stepless . CVT more and more attention and get a faster development of the world 's major car manufacturers are carrying out research and development work of the continuously variable transmission , particularly among the most studied metal belt CVT technology also the most mature . Metal belt CVT research has focused on its variable speed control system , variable speed control system of CVT speed ratio control as one of the most important content control engine operating in the optimum operating point the key . The first CVT transmission mechanism to determine the clamping force of the driven pulley ; explore the electro-hydraulic control system for metal belt CVT CVT hydraulic system mathematical model hydraulic control system parameters on the rate of change of speed ratio and the use of the model ; then CVT and engine matching , based on its control strategy . The papers focus on the problem of the speed ratio control target ratio to determine the different driving conditions , the impact of the speed ratio of the rate of change on the performance of the car , the speed ratio controller design study . On the basis of theoretical analysis , the use of the AMESim software to establish a CVT transmission simulation model , the model under different conditions CVT speed ratio control , and intuitive analysis on performance indicators , this theoretical analysis verification. Finally, the practical application powertrain response lag issues to improve the traditional ratio control algorithm , proposed a new algorithm , that is, the time delay algorithm makes the engine work a deviation from the optimum operating point improved to improve the car's fuel economy . CVT speed ratio control more comprehensive research and ratio control algorithm has been improved , and I believe it has great reference value in practical applications .

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Transmission > Mechanical transmission > Transmission
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