液压容积调节式全可变配气系统气门动力学特性研究

发布时间：2018-08-25 15:14

【摘要】：可变配气技术作为实现汽车节能减排目标的重要技术手段,能够根据发动机各工况下对进气量以及进、排气时刻的需求,实时控制进气门和排气门开闭的时刻、开启持续角以及气门开度的大小。课题组提出了一款新型液压容积调节式全可变配气系统,本文主要针对该配气系统的进气门动力学特性进行相关分析、研究。首先,应用运动弹性动力学原理,构建液压容积调节式全可变配气系统的单质量、多质量数学模型,并以此为理论基础,使用Excite TD构建该配气系统的进气门单阀系仿真模型,研究在不同曲轴转速下,该系统进行配气相位、气门升程调节时进气门的相关动力学特性。并将试验数据与仿真结果进行对比,以验证该动力学仿真模型的正确性,同时提出配气系统的改进措施。其次,基于瞬态动力学分析方法,运用ABAQUS搭建液压容积调节式全可变配气系统进气门的气门-气门座圈落座有限元模型,分析进气门和气门座圈在最大落座速度冲击下的应力情况,并研究落座速度和落座时间的变化对进气门和气门座圈的应力大小及分布的影响。
[Abstract]:As an important technical means to achieve the goal of energy saving and emission reduction of automobile, variable valve technology can control the opening and closing time of intake valve and exhaust valve in real time according to the requirements of intake and exhaust time of engine under different working conditions. Opening duration angle and valve opening. A new type of hydraulic volumetric variable valve distribution system is proposed in this paper. The dynamic characteristics of the intake valve of the system are analyzed and studied in this paper. Firstly, applying the principle of kinematic elastodynamics, the mathematical model of single mass and multiple mass of hydraulic volumetric variable valve system is constructed. Based on this model, the simulation model of intake valve single valve system is constructed by using Excite TD. The dynamic characteristics of intake valve under different crankshaft rotation speeds were studied when the phase of valve was adjusted and the valve lift was adjusted. The experimental data are compared with the simulation results to verify the correctness of the dynamic simulation model. At the same time, the improvement measures of the gas distribution system are put forward. Secondly, based on the transient dynamic analysis method, the finite element model of the valve-valve seat of the hydraulic volumetric variable valve system is built by using ABAQUS. The stress of inlet valve and valve seat ring under the impact of maximum seating velocity is analyzed, and the influence of the variation of seat velocity and sitting time on the stress magnitude and distribution of inlet valve and valve seat ring is studied.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U464.134.3

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