基于声学原理的发动机压缩比测量系统设计  

Design of Measuring System for Engine Compression Ratio Based on Acoustic Theory

作　　者：李鲁[1] 秦际宏 杨晓 金隼[1] 

机构地区：[1]上海交通大学上海市复杂薄板结构数字化制造重点实验室,上海200240 [2]上汽通用五菱汽车股份有限公司,柳州545007

出　　处：《机械设计与研究》2014年第4期85-88,共4页Machine Design And Research

基　　金："十二五"国家科技支撑计划资助项目(2012BAF06B03)

摘　　要：为了实现装配状态下汽车发动机压缩比的快速、精密、自动测量,开发了基于声学共振原理的试验台,动态测量随曲轴旋转而变化的气缸容积。介绍了测量原理及软硬件设计方案。基于LabVIEW开发了试验台的测控软件系统。实验表明,该试验台测量压缩比的重复精度达到±0.018(±3σ),测量速度为20 s/缸,实现了压缩比的快速、精密、自动测量。A new quick and precise system for measuring compression ratio of assembled automotive engines was proposed by using an acoustic resonance method. Cylinder volume was measured dynamically while crankshaft was driven by a motor. The measuring principle and the design scheme of hardware and software were introduced. Measuring and controlling software of the system was developed by programming in LabVIEW. Measurement for compression ratio of single cylinder can be finished in 20 seconds and a repeatability precision of ＋ 0. 018 （ ±3σ） is obtained. The system realizes rapid, precise and automatic measurement for compression ratio.

关 键 词：压缩比 亥姆霍兹共振 声学法 容积测量 动态测量 虚拟仪器 

分 类 号：TH16[机械工程—机械制造及自动化] U467.4[机械工程—车辆工程]