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Study on Electro-hydraulic Digital Technology for Metal Pusing V-belt CVT

Author: SuHaiLong
Tutor: LiuMingShu
School: Jilin University
Course: Vehicle Engineering
Keywords: CVT Electro-hydraulic control Digital technology Regulator
CLC: TH137.52
Type: Master's thesis
Year: 2011
Downloads: 68
Quote: 0
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Abstract


In today's era, the car has been inextricably linked with people's lives, with the widespread popularity of the automobile and automotive quality requirements gradually increase, the car's automatic transmission technology has become the focus of research in the field of automotive driveline. There are many ways to achieve automatic transmission, but currently many automatic transmission only CVT can achieve a continuous change of the speed ratio, and the moment can ensure that the engine is operating in the optimum area. CVT (Continuously Variable Transmission, CVT) is an ideal in today's field of automotive transmission gearbox CVT effect can be achieved relatively independent of engine speed and vehicle speed, to ensure that the engine always operates at the ideal speed region . The CVT gear is achieved by electro-hydraulic control system. The the early CVT control system the use of servo-controlled electro-hydraulic servo valve has a fast response, control and high precision; but there is also the complex structure, control complexity, high cost, anti-pollution and poor ability to shortcomings. Therefore, later gradually developed into the electro-hydraulic proportional control. The relative hydraulic servo valve, electro-hydraulic proportional valve has the advantages of low-cost, anti-pollution ability; due to the electro-hydraulic proportional valve is a proportional solenoid as electricity - machine conversion device, it is also the disadvantage of a large hysteresis, and need The continuous analog signal control. Emerging digital hydraulic valves not only inherits the advantages of servo valve control, high precision, and low cost of the proportional valve, but also to overcome the complex structure of the servo valve, contamination resistance defects. In addition, simple digital hydraulic valve control, no digital-to-analog conversion device can interface directly with the computer. With the rapid development of electronic technology, the CVT hydraulic control system with digital control technology will be a trend. This article is from the demand, according to the CVT speed the process of clamping force and speed ratio control requirements, the the digital relief valve designed for CVT clamping force control, reducing valve and integrated digital speed ratio control each plug hydraulic valve in valve block. The main content of the paper is as follows: (1) on a variety of automatic transmission do the comparison highlights the CVT works, its core electro-hydraulic control system works and the course of development. (2) the proportion of electro-hydraulic and electro-hydraulic digital technology analysis, analysis of the the existing CVT electro-hydraulic control system. (3) According to the slave cylinder CVT process and initiative cylinder pressure and flow requirements determine the design requirements and the physical structure of the the digital relief valve and digital pressure reducing valve; calculated and determined by the static characteristics of the digital pressure relief valve and reducing valve size parameters, and processing of the the prototype valve the digital relief valve and digital pressure reducing valve as well as integrated digital relief valves and digital pressure reducing valve slot, and oil hydraulic valve block. (4) Application of AMESim simulation software to build a simulation model of a the digital relief valve and digital pressure reducing valve, through the simulation analysis of the key parameters of the the digital relief valve and digital pressure reducing valve on the output, and digital relief valve the key parameters are optimized. (5) digital relief valves and digital pressure relief valve in the hydraulic system test rig were tested, digital pressure relief valve and pressure reducing valve through the test static and dynamic characteristics analysis, and finalized digital pressure relief valve - the relationship between the step bits relationship, digital output pressure reducing valve, input pressure and the pilot stage duty cycle three. The main innovation of this paper is to design a digital relief valves and digital pressure reducing valve can be used in the the CVT hydraulic control system.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Hydraulic transmission > Hydraulic components > Hydraulic control valves
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