一种液压式连续可变压缩比技术的研究  

Research on a hydraulic continuous variable compression ratio technique

作　　者：吴中义[1] 陈家兑[1] 王自勤[1] WU Zhong-yi;CHEN Jia-dui;WANG Zi-qin(Key Laboratory of Modern Manufacturing Technology,Ministry of Education,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学现代制造技术教育部重点实验室,贵州贵阳550025

出　　处：《工程设计学报》2018年第2期142-150,共9页Chinese Journal of Engineering Design

基　　金：国家科技支撑计划资助项目(2014BAH05F01);贵州省科技厅项目(黔科合LH字[2014]7626)

摘　　要：为进一步提高发动机燃烧效率,减少发动机有害气体的排放,提出了一种液压式连续可变压缩比技术的设计方案。它是通过液压系统控制偏心销转动来改变上止点的位置,从而使燃烧室体积发生变化,实现在调节区间内任意连续可变压缩比的改变。首先,根据所设计的方案分析了其液压系统在2个不同阶段的调节工作原理;然后,利用三维软件Solidworks2010对整个系统进行三维建模,根据模型设计的具体尺寸,得到连续可变压缩比调节的范围为8.81~22.43;最后分析了不同转速下活塞系统综合力(活塞惯性力和活塞表面气体压力的合力)的变化情况,并通过MATLAB与AMESim对构建的液压系统进行了联合仿真试验,探究了不同转速下活塞系统综合力向上和向下时液压系统的流量特性和压力特性。仿真结果表明:发动机转速在中低速条件下,活塞系统调节响应迅速,具有良好的动态特性,证明该设计具有一定实用性。仿真结果为用于液压容积调节的连续可变压缩比技术的实际应用提供了理论依据,具有重要的实际指导意义。In order to improve the combustion efficiency of engine and reduce the emission of harmful gas,a design scheme of hydraulic continuous variable compression ratio(VCR)technique of engine was proposed.It was through the hydraulic system to control the eccentric pin rotation to change the location of the top dead center(TDC),so that the volume of the combus‐tion chamber was changed to achieve the change of any continuous VCR in the adjustment inter‐val.Firstly,the working principle of the hydraulic system in two different stages was analyzed according to the designed scheme.Then,3D software Solidworks 2010 was used to model the whole system,and the range of continuous VCR(8.81 22.43)was calculated according to the specific size of the model design.Lastly,the change of the comprehensive force(inertial force of piston system and gas pressure at the piston surface)under different speed was analyzed,and the combined simulation test of the constructed hydraulic system was carried out by MATLAB and AMESim.The flow characteristics and pressure characteristics of the hydraulic system was ex‐plored at different speeds respectively with the resultant force exerts up and down.The simulation results showed that the piston system had fast response and good dynamic characteris‐tics under the condition of medium and low speed,and the proposed design was proved usefully.The simulation results provide a theoretical basis for practical application of continuous VRC technique for hydraulic volume control,which has important practical guiding significance.

关 键 词：连续可变压缩比 液压系统 动态特性 

分 类 号：TH113[机械工程—机械设计及理论]