高喷油速率共轨系统喷油量偏差研究  

Study on Fuel Injection Quantity Deviation of Common Rail System with High Fuel Injection Rate

作　　者：张子威 徐春龙 吴小军 ZHANG Ziwei;XU Chunlong;WU Xiaojun(China North Engine Research Institute,Tianjin 300400,China)

机构地区：[1]中国北方发动机研究所(天津),天津300400

出　　处：《机床与液压》2023年第5期183-188,共6页Machine Tool & Hydraulics

基　　金：国防科工局基础产品创新计划项目(DEDP_0201)。

摘　　要：随着柴油机行业对低油耗的持续追求和排放标准变得更加严格,要求高压共轨喷油系统的燃油喷射控制更精准,研究喷油量偏差具有重要意义。搭建高喷油速率共轨系统的试验平台,并建立仿真模型,研究该系统在不同数值范围的结构参数及不同工况条件下的喷油量偏差。仿真分析该系统喷油量偏差的影响因素及变化规律,并得到如下结论:当进油节流孔直径为(0.22±0.002)mm、出油节流孔直径为(0.28±0.003)mm、控制柱塞直径为(4.3±0.03)mm、针阀半锥角为(30.5±3)°可以实现40 MPa轨压和0.4 ms喷油脉宽工况条件下喷油量偏差率绝对值不大于8%;当针阀密封直径为(2.4±0.06)mm、针阀弹簧预紧力为(32±4)N、压力室入口直径为(1.5±0.15)mm,能够实现40 MPa轨压和0.8 ms脉宽工况条件下喷油量偏差率绝对值不大于8%,当喷孔直径取值范围为(0.24±0.02)mm,能够实现180 MPa轨压和0.8 ms脉宽工况条件下喷油量偏差率绝对值不大于8%。As the diesel engine industry continues to pursue low fuel consumption and emission standards become more stringent,the fuel injection control of the high-pressure common rail injection system is required to be more accurate.It is of great significance to study the fuel injection deviation.The test platform and simulation model of high injection rate common rail system were established.The structural parameters of the system in different numerical ranges and the fuel injection deviation under different working conditions were studied.The influencing factors and variation law of fuel injection deviation of the system were analyzed through simulation method.The following conclusions are obtained:when the diameter of oil inlet orifice is(0.22±0.002)mm,the diameter of oil outlet orifice is(0.28±0.003)mm,the diameter of control plunger is(4.3±0.03)mm,and the half cone angle of needle valve is(30.5±3)°,the absolute value of fuel injection deviation rate under the conditions of 40 MPa rail pressure and 0.4 ms pulse width is less then 8%;when the needle valve seal diameter is(2.4±0.06)mm,the needle valve spring preload is(32±4)N,and the pressure chamber inlet diameter is(1.5±0.15)mm,the absolute value of fuel injection deviation rate under 40 MPa rail pressure and 0.8 ms pulse width conditions is less then 8%;when the nozzle diameter range is(0.24±0.02)mm,the absolute value of fuel injection deviation rate under 180 MPa rail pressure and 0.8 ms pulse width conditions is less then 8%.

关 键 词：高喷油速率 共轨喷油系统 喷油量偏差 结构参数 

分 类 号：TK421.42[动力工程及工程热物理—动力机械及工程] TP391.92[自动化与计算机技术—计算机应用技术]