AVL燃烧分析及在标定的应用培训.ppt

Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,2021/9/26,*,Click to Edit Title,AVL Indicom SetUp,（,AVL,燃烧分析设置）,Equipment&set-up of AVL Indicom system for combustion measurement,（,AVL,燃烧分析的基本设置）,Angle encoder connection,（校标仪安装）,Cylinder Pressure transducer mounting and set-up(,压力传感器及设置,),Ignition signal set-up,（点火信号设置）,IndiCom Measurements,（采样）,IndiCom Results,（采样结果）,IndiCom use for engine calibration,（在台架标定的应用）,1,Engine Geometry Data,（发动机机械参数）,Type(,类型,)strokes/cycle(,冲程,)stroke,（缸径）,conrod(,活塞连杆中心距,)bore(,行程,)compression,（压缩比）,polytropic coefficient(,汽油,1.32,，柴油,1.37,，直喷,1.35),。

点火顺序及转角2,Angle Encoder,（较标仪）,安装要求：和皮带轮的同心度不大于,0.02mm,3,Angle Encoder,（较标仪）,设置或者选择较标仪类型,Type,设置发动机压缩上止点（通常设置,1,缸压缩上止点）,4,Angle Encoder TDC Determination,（较标仪压缩上止点测定）,Conduct TDC Determination at:,2000rpm WOT,（,Motored,）,(,油门全开倒拖,),Coolant Temp,（水温）,=90C,Oil Temp,（油温）,=90C,Use Loss Angle=0.7CA for,Motored Pressure.,AVL TDC Sensor is a more,Accurate Method!,（使用,AVL,压缩,上止点传感器将更精确5,IndiCom Signal Set-Up,（信号设置）,6,Charge Amplifier,（信号放大器）,7,Pressure Transducers,（压力传感器）,Use sensitivity according to pressure range,（压力变化敏感度）,20.70 for 100Bar range(Gasoline),（汽油机）,20.55 for 250Bar range(Diesel),（柴油机）,Pressure Transducer mounted in the cylinder head are more,reliable than spark plug transducers(but more difficult to fit).,8,Charge Amplifier Set-up,（放大器设置）,9,Cylinder Pressure Set-up,（绝对压力设置）,由于此类型压力传感器只能测量压力的变化值，而不能直接测量出压力的绝对值，因此按图示设置零位修正（,zero level correction,）以便能计算出压力的绝对值。

10,Cylinder Pressure Set-up,（绝对压力设置）,观察窗口的设置,11,Cylinder Pressure Set-up,（绝对压力设置）,12,Ignition Signal Set-up,（点火信号设置）,直接从点火线圈和,ECU,连接线上取点火信号设置当电压下降到多少,V,时火花塞点火如,1V,，这和点火线圈的特性有关）,13,Ignition Signal Set-up,（点火信号设置）,设置点火信号的工作范围及观察窗口14,Ignition Signal Set-up,（点火信号设置）,15,IndiCom Results,（采样结果）,选择要测量和计算的参数,16,Pmax,（最大燃烧压力）,17,PMax,（最大燃烧压力）,18,Indicated Mean Effective Pressure,（平均有效燃烧压力）,平均有效燃烧压力,IMEP=pdv,，反应发动机的做工能力，,IMEP,越大，发动机做工越多19,Indicated Mean Effective Pressure,（平均有效燃烧压力）,20,Heat Release,（热量释放）,热量释放（燃油燃烧）一般测量,AI10%,，,AI50%,AI75%,AI90%,时的曲轴转角。

21,Heat Release,（热量释放）,22,Heat Release,23,Knock,（爆震）,爆震采样时间,0.1DC,才能有效观测到爆震24,Knock,设置爆震定义，即什么情况下为一次爆震25,Knock,26,Ignition Results,（点火角采样结果）,27,Ignition Results,28,LogP LogV Diagram,（,PV,图）,29,发动机标定常用参数：,1,、,MBF50,（也可用,AI50,），发动机在最佳点火角时（,MBT,）,MBF50=81 ATDC,（受爆震影响除外）2,、,COV IMEP,反应发动机的燃烧稳定性，一般要求,COV IMEP3%,，放宽条件,COV IMEP Pmax_2sigma(Pmax_2sigma=Pmax.av+2Pmax.st,（,Pmax.av,为,Pmax N(N=300),个循环的平均值，,Pmax.st,为,Pmax N,个循环的标准差）,5,、,KP_PK,爆震压力，爆震标定时用来判断爆震的强弱6,、,KP_EFRQ,爆震频率，爆震标定时用来判断爆震的频度IndiCom use for engine calibration,（在台架标定的应用）,2021/9/26,30,Thermodynamic Correction,Ref:AVL IndiCom User Manual,31,Thermodynamic Correction,32,。