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Research on the Fuzzy-PI Composite Speed Ratio Control System for Metal V-belt Continuously Variable Transmission and Performance Assessment of Vehicle Equipped CVT

Author: ZuoWenBo
Tutor: ZhouYunShan
School: Hunan University
Course: Vehicle Engineering
Keywords: Metal belt type continuously variable transmission Fuzzy - PI composite ratio control Vehicle performance evaluation The CVT vehicle simulation platform
CLC: U463.212
Type: Master's thesis
Year: 2010
Downloads: 76
Quote: 1
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Abstract


With the rapid development of the automobile industry to design safer and more environmentally friendly, comfortable, energy-efficient modern car to adapt to the requirements of the times. The continuously variable transmission technology can reduce the driver's labor intensity, improve road safety, improve driving smoothness, comfort, making the car frequently in the process of moving in a good performance status, and improve vehicle emissions, is ideal for automotive transmission. CVT has a large power transmission capacity, higher transmission efficiency, long service life and so on, is currently the world's most widely used continuously variable transmission. CVT transmission torque to rely on the metal strip piece thrust to changing main working radius of the metal band on the driven pulley, the continuous variation of the speed ratio to control the operating point of the engine, transmission and engine the best match to improve the vehicle's power and fuel economy. This paper first introduces the basic structure of the metal belt type continuously variable transmission, works and critical control technology. Then for the car CVT Ratio Control of nonlinear and time-varying characteristics, this paper designed fuzzy-PI composite ratio control system, both the use of fuzzy control robustness and able to adapt to the controlled object nonlinear and time-varying advantages, but also the use of the PI control to eliminate the steady state error, improve control accuracy, in order to adapt to the continuously variable speed ratio control needs. The article fuzzy-PI compound control with the classic PID control simulation, confirmed the superiority of the fuzzy-PI composite speed ratio control. In this paper, the continuously variable transmission system dynamics analysis to an independent models for the study, using Matlab / Simulink established by the engine model, with a lock-up clutch torque converter model, the continuously variable transmission system and road load model, the driver model, the speed ratio control model consisting of continuously variable vehicle simulation platform, and vehicle simulation platform based on the design of power, economic evaluation simulation model, the simulation will not only verify the fuzzy-PI composite speed ratio control can well track the target gear ratio, having a good dynamic response and higher steady-state control accuracy and display equipment continuously variable transmission, the vehicle power and economy are improved. Finally, CVT bench and dynamic ratio test, based on test data to verify the feasibility of the fuzzy-PI composite ratio control method.

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