船用低速柴油机电控喷油器的动态响应特性研究

基于AMESim液力仿真平台搭建了船用低速柴油机双阀电控喷油器的数值模型,循环喷油量的计算值与实测值的最大误差仅为3.38%,且喷油压力、增压活塞位移关键时序指标的试验数据与计算数据的最大相对误差不足1%,证明了该模型的准确性。为了分析喷油器的动态响应特性,定义了开启响应时间和关闭响应时间,探究了结构参数对喷油器响应特性的影响规律,并通过帕累托分析确定了各因素对喷油器响应特性的影响权重。结果表明:喷油器开启响应时间与增压活塞小头直径、针阀最大升程、针阀弹簧预紧力、控制腔直径呈正相关,与增压活塞大头直径呈负相关,各因素对喷油器开启响应时间的影响权重分别为8.59%、15.74%、4.97%、10.88%、9.48%。喷油器关闭响应时间与增压活塞大头直径、针阀最大升程呈正相关,其影响权重分别为7.86%、27.33%,与增压活塞小头直径、针阀弹簧预紧力、控制腔直径呈负相关,其影响权重分别为6.22%、7.29%、7.36%。对于喷油器开启响应时间,增压活塞小头直径与增压活塞大头直径、增压活塞大头直径与针阀最大升程、增压活塞小头直径与针阀最大升程、增压活塞大头直径与针阀弹簧预紧力及增压活塞小...

Investigation on dynamic response of the electronically controlled injector for marine low-speed diesel engines

A numerical model of the double-valve electronically controlled injector for marine low-speed diesel engines was established based on the AMESim hydraulic simulation platform. The maximum error between the experimental and calculated cycle injection quantity was only 3.38% and the maximum relative error between the experimental and calculated crucial temporal index for injection pressure and the displacement of pressure amplification piston (PAP) is less than 1%, which validates the accuracy of the model. In order to analyze the dynamic response of the injector, the opening and closing response times were defined. The influences of the structural parameters on the response characteristics of the injector were explored. And the influential weights of the factors on the response characteristics of the injector were determined through Pareto analysis. The results show that the opening response time is positive correlated with the small end diameter of pressure amplification piston (PAP), the maximum lift of needle, pre-tightening for of needle spring and diameter of control chamber and is negative corre-lated with the diameter of big end of PAP. The influential weight of each factor on the opening response time is 8.59%, 15.74%, 4.97%, 10.88% and 9.48% respectively. The influential weights for the diameter of big end of PAP and the maximum lift of needle are 7.86% and 27.33% respectively, which are positive correlated with the closing response time. The diameter of small end of PAP, pre-tightening force of needle spring and the diameter of control chamber are negative correlated with the closing response time, the influential weights for the factors are 6.22%, 7.29% and 7.36% respectively. Among all the interactive factors of opening response time, the interactions between the diameters of the small and big ends of PAP, between the diameter of big end of PAP and the needle maximum lift, between the diameter of the small end of PAP and the needle maximum lift, between the diameter of big end of PAP and the pre-tightening force of needle spring, between the diameter of small end of PAP and the pre-tightening force of needle spring are the most significant ones and the influential weights are 5.49%, 4.55%, 3.95%, 3.33% and 3.19% respectively. As for the closing response time, the interactions between the needle maximum lift and the diameter of control chamber, between the diameters of big end of PAP and control chamber, among the needle maximum lift, the diameters of big end of PAP and control chamber, between the diameter of big end of PAP and the needle maximum lift, between the pre-tightening force of needle spring and the diameter of control chamber are the crucial interactive factors. The influential weights are 5.02%, 3.60%, 3.46%, 3.39% and 3.17% respectively.