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The Design and Experimental Study of Electro-hydraulic Variable Valve Experiment System Based on High-speed Engine

Author: DingXiaoChuan
Tutor: XieYingJun
School: Zhejiang University
Course: Mechanical and Electronic Engineering
Keywords: Variable valve timing system Lift Opening phase Open the duration Electro-hydraulic control Experimental system
CLC: U464.13
Type: Master's thesis
Year: 2008
Downloads: 160
Quote: 2
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Abstract


With the increasingly serious energy crisis and environmental issues, the world car engine's power and emissions standards are getting higher and higher requirements, energy saving, high output torque and high output power has become a Car Engine Development Goals. Variable valve technology can be changed by the valve lift, opening phase and open duration of the control of the engine operating characteristics. Practice shows that the variable valve timing technology has become a practical and widely used automotive energy-saving technologies. This paper describes a high speed (maximum speed 4000r/min) automobile engine variable valve control technology, electro-hydraulic variable valve control principle, variable valve experimental system solutions based on electro-hydraulic control technology, and designed the experimental system. The analysis of the static and dynamic characteristics of the test system, the system has a variation of the experimental pressure range (up to 12MPa), instantaneous release flow (45L/min). On this basis, launched high-speed electro-hydraulic variable valve experimental system design of high pressure and large flow source, and key components of the system design and selection. Finally, the electro-hydraulic variable valve system control strategy was investigated experimentally. The thesis consists of six chapters the first chapter is an introduction to introduce variable valve timing technology background, as well as variable valve timing technology development status. Illustrates the research significance and the main content of the paper. Chapter II launched by high-speed electro-hydraulic variable valve timing control scheme, the study compared the characteristics of the electro-hydraulic variable valve control system, the principle of electro-hydraulic variable valve experimental system design and dynamic modeling analysis test system static operating characteristics, as a basic design parameters of the system; the Chapter design electro-hydraulic variable valve experimental system of high pressure and large flow source and experimental test systems, and major system components design and selection; Chapter IV the load characteristics of the electro-hydraulic variable valve system analysis, design of high-speed hydraulic cylinder, high-speed hydraulic cylinder force, strength, strut stable, sealed and efficiency analysis; system the hydraulic experimental design interface valve block; Chapter build experimental platform, high-frequency electro-hydraulic control valve and quick response proportional amplifier, a pilot study on the variable valve timing system, electro-hydraulic variable valve system typical control experiments on valve lift, timing and open the duration work characteristics, the expected design goals of the verification system; Chapter VI of the research conclusions summarize, a detailed analysis of the deficiencies in the study, the research found, outlook and expectations of further research work.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive engine > Reciprocating engine > Components, parts
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