摩托车发动机点火提前角实时调节系统

提出了一种具有调节点火提前角功能的控制系统,该系统能够在对化油器发动机进行简单改造加装点火控制ECU后对其点火提前角进行标定,对发动机在不同转速和工况下的点火提前角进行实时的调节,寻找到发动机在该转速和工况下的理想点火提前角。能够根据实际调节的理想点火提前角生成点火提前角曲线,对ECU内部原有的点火提前角曲线进行修改,使ECU能够根据实际情况控制发动机理想的点火提前角。该系统还可以实时调节电控发动机点火提前角。     

一种新型的摩托车数字点火系统——火花点火调试仪的设计与实验研究

介绍了一种新型的摩托车数字点火系统——火花点火调试仪的设计,该系统采集摩托车发动机在某一工况运行时磁电机发出的电信号,计算发动机的转速,并采集节气门位置传感器传来的节气门开度信号;在不同的转速和负荷下,扫描点火提前角,对比不同点火提前角时的动力性、经济性指标,得出该工况的最佳点火提前角;调节发动机的工况,重复上述扫描过程,最终得到发动机运行范围内以转速和负荷(以节气门开度表征)为参数的最佳点火提前角map图。     

对摩托车点火系统电子控制的研究

本文介绍了在摩托车发动机点火系统中采用Ｍｏｔｏｒｏｉａ单片机调节点火延迟角，对点火时间进行控制的方法。实验结果表明，该系统使发动机的点火时间得到了有效的控制。     

对摩托车点火系统电子控制的研究

本文介绍了在摩托车发动机点火系统中采用Ｍｏｔｏｒｏｌａ单片机调节点火延迟角，对点火时间进行控制的方法。实验结果表明，该系统使发动机的点火时间得到了有效的控制。     

压缩天然气发动机点火驱动的设计与研究

介绍了基于电控调压器技术的压缩天然气发动机电控系统.为了实现点火正时和点火能量的精确控制,设计了单缸高能点火驱动系统.基于电路仿真的方法,采用智能IGBT元件简化了点火驱动硬件电路设计.基于32位微控制器的TPU时间处理单元,可以精确实现点火正时的控制、点火提前角的控制及点火能量的控制,软件设计了点火正时和能量的修正方法.另外设计了用点火提前角进行调速的方法.开发的CNG发动机ECU及相应的点火驱动模块,已经成功应用于CNG发动机台架试验.试验结果表明:点火驱动硬件工作正常可靠,可以精确控制点火正时和点火能量,通过调整点火提前角可以实现怠速中调速的效果.     

如何正确调整点火提前角

点火提前角的大小,对发动机性能有直接的影响。当发动机处于最佳点火提前角时,其动力性、经济性,都具有最佳的数值。那么,多大的点火提前角才能算最佳的点火提前角呢? 点火提前角,它与转速和负荷有关,在实际工作中,发动机的转速和负荷是经常变化的,所以点火提前角也是一个变化量。从     

点火提前角对氢发动机性能的影响及智能控制技术

进行了进气管喷射的氢发动机点火提前角对发动机性能影响的研究，试验指出了点火提前角对氢发动机动力性，经济性和排放性能有较大影响。建立了模糊神经网络控制系统对点火提前角进行优化控制，建立了一个改进的模糊神经网络系统代替传统的试验方法来求解氢发动机的最佳点火提前角(MAP)。仿真和试验结果的对比研究给出该方法具有较高的运行精度。     

四冲程汽油机点火装置的设计与实现

本文以四冲程汽油发动机为基础,该发动机采用了双凸轮轴的磁电机转子设计。针对该磁电机转子的特点,设计采样和点火电路,结合点火补偿策略设计并实现一套新的发动机点火系统。单片机实时读取速度和节气门开度信号,并通过对发动机功率曲线的测量绘制发动机点火提前角的MAP图。整机测试结果显示,该系统提高了摩托车的点火提前角的控制精度和点火能量,提高了发动机的输出功率和转拒。     

基于转速反馈的CNG发动机点火提前角标定

点火正时对发动机运行时的动力性、经济性和排放具有很大影响,因此最佳点火提前角的选取十分重要。以发动机转速为反馈信号,利用MATLAB/Simulink软件建立CNG发动机点火提前角标定控制模型,算法实施平台为dSPACE公司的MicroAutoBox,在实验室NQ150N型天然气发动机上进行了算法测试。实验结果表明,以转速为反馈信号的点火提前角标定算法简单可行,并且能较快地找到对应工况下的最佳点火提前角。     

摩托车用二冲程汽油机智能点火器的研制

本文提出一种由PIC单片机控制的摩托车用智能点火系统，系统介绍了它的基本原理、系统构成、工作特点和实验研究。该系统可以根据磁电机的脉冲信号输出点火角可调的点火脉冲，实现了点火提前角的数字式控制，其结构简单，可以满足发动机对点火系统的要求。     

A study of hydrogen fuelled compression ignition engines

The possibility of establishing a hydrogen fuelled compression ignition engine has been investigated experimentally using a conventional swirl chamber diesel engine. Two different attempts are included in this work; one dealing with the compression ignition on an air-aspirated engine system, and another with an engine operating with an argon-oxygen charge. In the former, the effect of preliminary fuelling was clarified in detail. It has been suggested that both pilot injection and fuel leakage from the injector can aid ignition of the hydrogen fuel, bringing about a smooth operation. A discussion is given of the mechanism of stabilizing ignition, from the viewpoint of thermal interactions between the engine cycles. In the latter attempt, a closed-cycle engine system is oriented and has been simulated by supplying a 21% oxygen containing mixture to the test engine. The result has indicated that ignition and engine operation are satisfactory without any ignition aid. A considerable gain has also been proved in thermal efficiency of using the argon mixture. Also, the practical feasibility of a closed-cycle compression ignition engine has been discussed.     

Ignition delay of dual fuel engine operating with methanol ignited by pilot diesel

An investigation on the ignition delay of a dual fuel engine operating with methanol ignited by pilot diesel was conducted on a TY1100 direct-injection diesel engine equipped with an electronic controlled methanol low-pressure injection system. The experimental results show that the polytropic index of compression process of the dual fuel engine decreases linearly while the ignition delay increases with the increase in methanol mass fraction. Compared with the conventional diesel engine, the ignition delay increment of the dual fuel engine is about 1.5° at a methanol mass fraction of 62%, an engine speed of 1600 r/min, and full engine load. With the elevation of the intake charge temperature from 20°C to 40°C and then to 60°C, the ignition delay of the dual fuel engine decreases and is more obvious at high temperature. Moreover, with the increase in engine speed, the ignition delay of the dual fuel engine by time scale (ms) decreases clearly under all engine operating conditions. However, the ignition delay of the dual fuel engine increases remarkably by advancing the delivery timing of pilot diesel, especially at light engine loads.     

Homogeneous charge compression ignition engine operating on synthesis gas

Mixtures of hydrogen and carbon monoxide were used to simulate the fuel component of synthesis gas and operate a single cylinder engine in homogeneous charge compression ignition (HCCI) mode. The engine was originally an air-cooled direct injection (DI) compression ignition (CI) engine. The original diesel fuel injection system was removed and a port fuel injection (PFI) system with intake air heating was added. The engine speed was maintained at a constant 1800 RPM.     

Ignition delay of dual fuel engine operating with methanol ignited by pilot diesel

An investigation on the ignition delay of a dual fuel engine operating with methanol ignited by pilot diesel was conducted on a TY1100 direct-injection diesel engine equipped with an electronic controlled methanol low-pressure injection system. The experimental results show that the polytropic index of compression process of the dual fuel engine decreases linearly while the ignition delay increases with the increase in methanol mass fraction. Compared with the conventional diesel engine, the ignition delay increment of the dual fuel engine is about 1.5° at a methanol mass fraction of 62%, an engine speed of 1600 r/min, and full engine load. With the elevation of the intake charge temperature from 20°C to 40°C and then to 60°C, the ignition delay of the dual fuel engine decreases and is more obvious at high temperature. Moreover, with the increase in engine speed, the ignition delay of the dual fuel engine by time scale (ms) decreases clearly under all engine operating conditions. However, the ignition delay of the dual fuel engine increases remarkably by advancing the delivery timing of pilot diesel, especially at light engine loads. __________ Translated from Journal of Harbin Institute of Technology, 2007, 41(7): 784–787,796 [译自: 西安交通大学学报]     

多次点火提高LPG发动机点火可靠性的研究

以液化石油气（1iquefied petroleum gas）为燃料的发动机对点火系统的要求较普通汽油发动机高,由于其可能存在失火使LPG发动机的怠速稳定性不佳。对应用多次点火方式提高LPG发动机的点火可靠性进行了试验研究。试验设计了通过ECU控制点火提前角的多次点火系统,并通过怠速稳定性间接验证了多次点火对点火可靠性的影响。试验结果表明：多次点火有助于提高点火可靠性,特别在点火提前角过大或过小、空燃比偏离最佳点火比例时。     

高能（电子）点火系与供油系匹配试验研究

通过对两种点火系进行定功率质量调整对比，说明高能点火可燃用较少的汽油而发生同样的功率，因而排放与油耗率均得到改善，据此试验结果，对化油器进行匹配调整，取得提高发协机动力性（Ｐｅ ｍａｘ提高３．９％），改善经济性和降低排放（常用工况油耗率下降４．７％，ＣＯ和ＨＣ平均下降５０％以上）的效果，动态性能也有明显提高。试验还表明，高能点火正确匹配使用，它不但是机内净化的有效装置，也是改善发动机性能的重要途径     

燃油性质与喷油参数对陶瓷隔热复合机燃烧过程的影响

摘要在定容燃烧装置与B1135型单缸机上,对陶瓷隔热复合机的燃烧过程进行了试验研究.结果表明,由于陶瓷隅热复合机的压缩终点温度和压力很高,使滞燃期过短,空气粘度高,着火点在喷油嘴孔口附近,初期火焰横贯喷注,使空气与燃油混合条件差,因而仍沿用常规发动机燃烧系统参数时,燃烧过程恶化、燃油消耗率上升.采用减小喷油嘴孔径、增多喷孔数以改善空气与燃油的混合条件,以及采用低16烷值、低粘度燃油以获得滞燃期加长、着火点远离孔端等措施.对改善陶瓷隔热复合机燃烧过程具有良好的效果.     

高能点火系统在CG125发动机上的应用研究

点火能量是影响发动机性能的重要因素,通过提高点火能量可达到降低油耗和改善排放的目的。为此,本文介绍了一种汽油机用高能点火测试系统,并在CG125发动机上进行了高能点火的试验研究。结果表明,使用高能点火后不仅降低了油耗,还在一定程度上提高了发动机的输出功率。     

直喷式LPG/柴油混合燃料压燃发动机的研究

基于液态LPG／柴油混合燃料在油泵前按一定比例混合和缸内直喷压燃的构想,开发了液态LPG／柴油比例混合电子控制系统。对该控制系统进行的一系列性能测试结果表明,它能根据发动机不同工况的需要,任意调节液态LPG／柴油的混合比,且调整精度较高。应用该系统,进行了直喷式LPC／柴油混合燃料压燃发动机的性能试验。试验结果表明：直喷式LPG／柴油混合燃料压燃发动机具有与柴油机相同的动力性与燃料经济性,而其烟度、NOx和HC排放均优于原柴油机。     

Particulate emissions from laser ignited and spark ignited hydrogen fueled engines

Exponentially increasing energy demand and stricter emission legislations have motivated researchers to explore alternative fuels and advanced engine technologies, which are more efficient and environment friendly. In last two decades, hydrogen has emerged as promising alternative fuel for internal combustion (IC) engines and vehicles. For gaseous fuels, laser ignition (LI) has emerged as a novel ignition technique due to its superior characteristics, leading to improved combustion, engine performance and emission characteristics. Numerous advantages of LI system such as flexibility of plasma location, lower NO_x emissions and capability of igniting ultra-lean fuel–air mixture makes LI system superior compared to conventional spark ignition (SI) system. This study experimentally compares particulate emissions from hydrogen fueled engine ignited by LI and SI systems. Experiments were performed in a constant speed engine prototype, which was suitably modified to operate on gaseous fuels using both LI as well as SI systems. Particulate were characterized using engine exhaust particle sizer (EEPS) spectrometer. Results showed that LI engine resulted in relatively higher particulate number concentration as well as particulate mass compared to SI engine. In both ignition systems, particulate emissions increased with increasing engine load however rate of increase was relatively higher in LI system. Relatively larger count mean diameter (CMD) of particulate emitted from SI engine compared to LI engine was another important observation. This showed emission of relatively smaller particles in larger numbers from LI engine, compared to baseline SI engine.