二次补气和配气相位对摩托车发动机怠速稳定性和动力性的影响  

Effects of secondary air and valve timing on idle speed stability and power performance of motorcycle engine

作　　者：张力[1] 李祖成[1] 张青[1] 周照强 吕晓惠[1] 钟德妹 ZHANG Li;LI Zucheng;ZHANG Qing;ZHOU Zhaoqiang;L YU Xiaohui;ZHONG Demei(College of Automotive Engineering,Chongqing University,Chongqing 400044,P.R.China)

机构地区：[1]重庆大学汽车工程学院,重庆400044

出　　处：《重庆大学学报（自然科学版）》2018年第7期8-15,共8页Journal of Chongqing University

基　　金：重庆市应用开发计划重大项目(CSTC2015YYKFC60004)~~

摘　　要：为分析一款摩托车发动机加装二次补气装置后怠速稳定性提升的原因,利用数值模拟方法建立原机仿真模型,通过对仿真模型标定表明该模型具有较高的模拟精度,在此模型基础上,建立二次补气发动机仿真模型。利用以上模型分析二次补气对怠速稳定性的影响,发现原机怠速不稳的主要原因为其残余废气系数过高。为解决原机怠速不稳问题,从配气相位出发,研究在对原机动力性影响较小的情况下降低残余废气系数的方法。结果表明:将排气相位整体提前可以将残余废气系数降至二次补气发动机的水平,且扭矩下降最大值不超过2%。In order to analyze the reason for the improvement of the idle stability for a motorcycle engine when equipped with a secondary air compensating device,a model for the original engine is set up by the method of numerical simulation.The validation results of this model reveal relatively high simulation accuracy,and a model for the secondary air engine is established based on the previous model.The influence of secondary air on idle stability analyzed by using those simulation models,and the research reveals the main cause of idle instability for the original engine is that the residual gas fraction is too high.Based on valve timing,this research aims at finding a way to reduce residual gas fraction with relatively low influence on power performance for the original engine.The results indicate that the residual gas fraction for the original engine drops to the level of secondary air engine by advancing exhaust valve timing and the torque maximum value falls no more than 2%.

关 键 词：摩托车发动机 二次补气 配气相位 残余废气系数 怠速稳定性 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]