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一种电控喷油器动态时间参数测试方法 总被引:2,自引:0,他引:2
详细分析了电控喷油器的动态工作过程,基于电控喷油器线圈电流变化规律,提出一种测试其动态响应时间的方法。以高性能C8051F310单片机为处理器,设计了喷油器开启与关闭响应时间的测试电路,开发了成本低、测试便捷、精度高的测试系统。实测结果表明,喷油器的开启与关闭的响应时间测量误差分别为0.9%和1.14%,满足喷油器设计开发、生产的要求。同时,给出了开启响应时间随供电电压的变化关系曲线,该曲线为电控喷油器标定及发动机匹配时对喷油量的修正提供了参考。 相似文献
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采用虚功原理得到了针阀开启所需电磁力的计算模型,根据针阀开启所需电磁力大小对电磁线圈匝数、针阀材料、磁轭材料进行了选择.通过Maxwell3D/2D软件对电控柴油机喷油器电磁阀进行了二维电磁场分析,得到了系统磁感应强度与磁力线分布图以及针阀受到的电磁力大小.根据所得结果,证明了计算模型具有较高的精度,提出的喷油器电磁阀结构参数合理,研究方法可用于开发电控柴油机用高性能电磁阀. 相似文献
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试验与仿真模拟相结合,利用正交试验设计方法,对喷油器喷孔直径、喷孔数目、喷雾锥角和喷油提前角4个因素进行数值模拟计算,研究多因素匹配对发动机燃用B20生物柴油-柴油混合燃料时扭矩、燃油消耗率和NOX排放量的影响,通过极差分析和方差分析确定因素主次关系,给出相应的最优匹配方案。研究表明,喷孔数目和喷油提前角是影响发动机扭矩和燃油消耗率的显著因素,喷油提前角是影响NOX生成的显著因素。为了更好的满足日益严格的排放法规,同时兼顾发动机动力性和燃油消耗率得出其最优匹配方案为:喷孔直径为0.25mm,喷孔数目为8,喷油提前角为10℃A,喷雾锥角为145°。 相似文献
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喷油器是电控喷油系统中最基本、最关键的元件之一,它接受电子控制单元(ECU)发出的控制指令,完成喷油过程,以实现满足系统要求的各种不同喷油规律。由于喷油器的工作油压很高,为保证其工作的安全性和可靠性,检验其结构参数是否合理,有必要对其进行有限元强度计算。本文采用大型CAD软件I-DEAS Master SeriesTM,对喷油器体进行了强度计算和应变分析。对喷油器的结构参数和材料选择进行了调整和优化,为喷油器的结构设计和材料选用提供理论指导,提高设计成功率,降低开发成本。 相似文献
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为提高喷油器的动态响应性能,以某款电控喷油器为研究对象,通过在其铁芯与导向管之间增加由不导磁材料制成的隔磁环开发了一种新型磁路结构。通过电磁场仿真分析了改进前后喷油器电磁性能的变化特点以及轭铁厚度对电磁性能的影响规律。结果表明:增加隔磁环能加快电磁力的上升速度,有效缩短喷油器的开启滞后时间,但饱和电磁力增大,造成落座滞后时间延长;适当减小轭铁厚度基本不影响电磁力的上升速度,但减小轭铁厚度会使磁阻增大,饱和电磁力降低,这样可有效缩短落座滞后时间。根据以上分析结果对喷油器进行了综合优化,并通过实验对其改进效果进行了验证,结果表明:优化后与优化前相比,喷油器的开启滞后时间缩短了0.25ms,落座滞后时间缩短了0.3ms。 相似文献
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乙醇燃料是含氧燃料,无毒且对环境无危害,蒸发潜热高,发动机燃用乙醇可以实现无烟排放,并能大幅度降低CO排放。乙醇的汽化潜热大,理论空燃比下的蒸发温度大于常规汽油,但乙醇汽车存在启动难的问题。针对以乙醇为燃料的汽车难以启动的问题,提出了一种体积小、控制精确、制造成本低的汽车喷油嘴加热模块,并详细介绍了该汽车喷油嘴加热模块的工作原理,利用TestStand软件测试了喷油嘴加热模块的输入电流、输入端与输出端的频率和占空比、Feedback端与Heater端的电压等,模拟了乙醇汽车喷油嘴加热助启动实验。实验研究结果表明:喷油嘴加热模块能有效地帮助乙醇汽车启动,并且具有广阔的推广应用前景。 相似文献
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汽车电喷系统喷油控制分析与软件设计 总被引:1,自引:0,他引:1
主要对电子燃油喷射系统喷油控制进行分析,详细给出了发动机负荷、喷油脉宽的计算方法,同时也给出了各修正量的修正原因、计算方法和影响效果。基于以上分析设计了经济型轿车的电控燃油喷射系统喷油控制软件,经过调试该软件能基本实现各种喷油控制功能。 相似文献
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PT fuel injector is one of the most important parts of modern diesel engine.To satisfy the requirements of the rapid and accurate test of PT fuel injector,the self-adaptive floating clamping mechanism was developed and used in the relevant bench.Its dynamic characteristics directly influence the test efficiency and accuracy.However,due to its special structure and complex oil pressure signal,related documents for evaluating dynamic characteristics of this mechanism are lack and some dynamic characteristics of this mechanism can’t be extracted and recognized effectively by traditional methods.Aiming at the problem above-mentioned,a new method based on Hilbert-Huang transform(HHT) is presented.Firstly,combining with the actual working process,the dynamic liquid pressure signal of the mechanism is acquired.By analyzing the pressure fluctuation during the whole working process in time domain,oil leakage and hydraulic shock in the clamping chamber are discovered.Secondly,owing to the nonlinearity and nonstationarity of pressure signal,empirical mode decomposition is used,and the signal is decomposed and reconstructed into forced vibration,free vibration and noise.By analyzing forced vibration in the time domain,machining error and installation error of cam are revealed.Finally,free vibration component is analyzed in time-frequency domain with HHT,the traits of free vibration in the time-frequency domain are revealed.Compared with traditional methods,Hilbert spectrum has higher time-frequency resolutions and higher credibility.The improved mechanism based on the above analyses can guarantee the test accuracy of injector injection.This new method based on the analyses of the pressure signal and combined with HHT can provide scientific basis for evaluation,design improvement of the mechanism,and give references for dynamic characteristics analysis of the hydraulic system in the interrelated fields. 相似文献
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Performance of diesel engines are influenced by fuel spray distribution, fuel-air mixture formation and combustion, which are also influenced by hole-to-hole fuel injection rate from multi-hole injectors. In this study, a customized spray momentum flux experimental test rig was used to measure the transient injection rates from a two-layered 8-hole diesel injector. The results indicated that the fuel injection rate and the cycle fuel injection quantities of the lower-layered nozzle holes were 3–15% higher than the fuel injection rates and the cycle fuel injection quantities of the upper-layered nozzle holes. A three-dimensional (3D) computational fluid dynamics (CFD) model of the two-layered 8-hole diesel injection nozzle was developed and validated by analyzing the relative error between the numerical results obtained from the model and the experimental results measured with the test injector. The simulation results showed that the relative average deviation of hole-to-hole cycle injection quantities were less than ±1%, which is the result of 5% increment in the cross-sectional area of the upper-layered holes. 相似文献
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