内燃机燃烧过程光纤传感器光电探测技术的研究

论述内燃机燃烧过程新型光纤传感器光电探测技术研究的初步成果，介绍光探测系统的主要构成及其在燃烧探测中的应用。研究表明，光纤探测系统对实现燃烧过程的燃烧时间、爆震、循环稳定性、温度及燃烧产物成分等多项燃烧特征的准确测量向步探测意义重大，光纤传感器是探测能力宽和具有良好发展应用前景的内燃机燃烧分析测试传感器。     

基于缸压信号的EMS爆震传感器识别能力评定

早燃、爆震是发动机的非正常燃烧现象,超级爆震会在短时间内损坏发动机。根据控制策略,爆震检测是发动机调整参数抑制爆震的基础,而爆震特征的提取和评价是爆震检测与控制的前提。文章通过进行发动机爆震试验,基于EMS爆震传感器信号识别爆震的方法进行系统研究,旨在提高EMS识别爆震精度和爆震强度,提出了爆震强度评价指标KI,最后利用基于缸压传感器得到的爆震因子KV对其进行验证,结果表明:基于缸压信号,可以对EMS爆震传感器的识别能力进行评价,EMS选择合适的阈值可以100%识别出重度爆震。     

日产风度A32发动机爆震传感器的检测

风度轿车发动机爆震传感器检测气缸混合气燃烧过程中发动机的爆震情况，将缸体的振动转换为电信号送入发动机电控单元，用于点火系统的爆震控制。     

新款爱丽舍16V发动机电控系统的检修(二)

3.爆震传感器 爆震传感器型号是KS—1,其结构如图5所示。爆震是由于燃烧室里混合气体异常燃烧爆炸而产生的震动现象,反复出现此现象会因内壁温度异常升高而损坏发动机零件。爆震传感器安装在发动机缸体上,可以检测到震动现象。通过ME7.4.4的控制策略,可减少、抑制爆震现象的发生。     

用爆震传感器控制发动机的方法

<正> 利用带爆震传感器的系统,可以保证火花点火式发动机气缸内燃油燃烧的条件随环境空气的压力、温度和湿度、发动机本身的热和技术状况及其一些特性(如实际的压缩比)变化并燃用不同的抗爆性燃油时无爆震地工作。在运转过程中,通过相应自动校正发动机的调整(例如点火提前角的调整),即可做到这一点。     

点火方案对摩托车发动机燃烧特性的影响

为了提高摩托车发动机的热效率,研究不同的点火方案对发动机燃烧特性的影响,基于宗申DB133发动机初步提出了5种点火方案,搭建了燃烧特性测试系统.试验针对单双火花塞及不同点火提前角曲线组合,通过燃烧压力、压力升高率、燃烧放热率、循环变动率、平均有效压力指标以及爆震的对比得出:同为双火花塞不同的点火提前角曲线,如果点火提前...     

光纤传感器在发动机燃烧研究中的应用与发展

对应用于发动机的新型传感器———光纤燃烧传感器的研究及应用进行了概括分析,着重介绍了其不同的结构形式,并论述了将光纤传感器应用于发动机燃烧检测的基本工作原理、检测方法和适用对象。     

点火正时和EGR对甲醇发动机爆震特性影响研究

以一台改装的点火式甲醇发动机为研究对象,通过控制进气压力保证每循环油量为定值,并且按过量空气系数为1进行燃烧,应用CFD软件Fire在易发生爆震的低速大负荷工况分别研究点火正时、EGR率和EGR温度对该发动机爆震指数的影响。结果表明:推迟点火正时可以使压力波动出现在缸压的下降段,有效改善爆震;随EGR率增加,初始爆震指数变化并不明显,之后爆震指数迅速下降;随EGR温度的降低,爆震指数也随之减小;上述3种方式中使用冷EGR降低爆震对缸压的影响最小。     

现代汽车电子点火系统及其应用（四）

5．爆震控制 发动机运转过程中，由于点火过早或汽油辛烷值过低，火焰在传播途中，如果压力异常升高时，一些部位的混合气不等火焰传到，就自行着火燃烧，即造成瞬间爆发燃烧，这种现象称为爆震。     

在燃烧室中装有压力传感器的发动机

丰田汽车合司生产了一种4缸、排量为1．6L的稀薄燃烧发动机，在发动机的燃烧室中装有世界上第一个燃烧压力传感器．这种发动机在日本已有出售。燃烧压力传感器（如下图）可直接测量每个气缸内的燃烧压力，从而可以精确控制空燃比，致使稀薄燃烧发动机排放出较低的NOx，并具有较高的燃烧经济性．燃烧压力传感器是一种由陶瓷材料制成的装置．当发动机工作时，燃烧室中的压力作用于传感器底部的膜片上．膜片所承受的压力通过白瓷盘及担电极产生电技单元，电技单元根据＊冲星据来往＊发动机的强党过气问门．在发动机中流设计了回族形进气过，…     

内燃机曲轴扭转振动测试技术的发展

在分析内燃机曲轴扭转振动的几种测量方法原理及其系统结构特点的基础上，开发研究了采用ＰＣ机对曲轴扭振进行测量的新的数字化方法，并介绍了该方法的工作原理及测量结果。结果表明，采用角标器利用微机技术对曲轴进行数字化测量的系统，克服了以往扭振测量方法的缺点，可直接对扭转角进行测量，精度高，线路简单，由于采用并行数据接口，可提高测量的实时性。     

Influence of the accelerating operation mechanism on the combustion noise in DI-diesel engines

This paper focuses on the mechanisms of combustion noise during the accelerating operation of multi-cylinder diesel engines using testing technology for the transient conditions of IC engines. Based on impact factors, such as the gas dynamic load and cylinder pressure oscillations, tests and analysis of the combustion noise during transient and steady-state conditions for different loads are made on four-cylinder naturally aspirated engines, turbocharged engines, EGR-introduced engines, and high pressure common rail engines. The laws of combustion noise difference for the same engine speed and load are researched during transient and steady-state conditions. It is found that during transient conditions, the maximum pressure rise rate and the high frequency oscillation amplitude of the cylinder pressure are all higher than those observed during steadystate conditions for the same engine speed and load. With their joint action, the combustion noise during transient conditions is greater than that during steady-state conditions. Turbocharging is useful in reducing the combustion noise during transient conditions. Turbocharging has a better effect on the control over the combustion noise during transient conditions with a constant engine speed and an increasing torque than in conditions with a constant torque and an increasing engine speed. One of the main reasons for different control effects on the combustion noise is that turbocharging causes different wall temperatures inside combustion chambers. The introduction of the appropriate EGR is helpful in the reduction of the combustion noise during transient conditions. The key to the control of combustion noise with EGR during transient conditions is whether a real-time adjustment to the EGR rate can be made to achieve the optimization of the EGR rates for different transient conditions. By means of analyzing the differences in the combustion noise between the transient and steady-state conditions for different pilot injection controls, we obtain a strategy for controlling the combustion noise during transient conditions with a pilot injection. Compared with the steady-state conditions, a larger pilot injection quantity and a longer interval between the main injection and pilot injection should be selected for transient conditions, and this is verified through tests.     

Development of measuring method for oil film pressure of engine main bearing by thin film sensor

In this study, a thin film pressure sensor made of manganin was developed by means of sputtering. The sensor was formed directly on the sliding surface of a plain bearing, and oil film pressure measurement during engine operation was carried out successfully. The formation method and characteristics of the sensor are presented in this paper, together with the measured data, taking account of instantaneous temperature fluctuation occurring during one cycle and deformation of the bearing, which would cause measurement error.     

汽油发动机爆燃的危害及控制措施

汽油发动机爆燃具有较大的危害，是发动机工作时的一种不正常燃烧现象。分析了汽油发动机爆燃的产生原因及其对发动机的危害，提出了在使用过程中控制汽油发动机爆燃的具体措施。     

Study on the measurement of oil-film pressure of engine main bearing by thin-film sensor — The influence of bearing deformation on pressure sensor output under engine operation

In a previous paper, oil-film pressure in an engine main bearing was measured by a using thin-film Manganin sensor. This sensor had adequate sensitivity to strain and temperature in terms of measurement principle. In this study, more accurate measurement of oil-film pressure was allowed by the formation of the newly developed thin-film strain sensor made of Ni-Cr-Al at the same location as that of the Manganin pressure sensor, and the correction of measurement errors caused by strain. The characteristics of bearing metal surface strain varied by engine operating conditions are also shown in this paper.     

基于气电转换的发动机缸体在线测量系统

工业计算机控制的发动机缸体测量系统是由气动测量芯轴和差压式测量回路等组成,系统采用气电转换技术,在线自动测量发动机缸孔和主轴承孔并分组打号,满足了生产现场高精度测量的要求。     

便携式发动机燃油油压管外检测装置设计

发动机燃油油压检测对保障汽车正常运行具有现实意义。通过文章中设计的便携式发动机燃油油压管外检测装置,实现与燃油非直接接触式的无损油压检测。该装置通过机械转换机构、压力传感器、数据采集以及数据显示等几个组成部分实现管内压力的数据采集、模拟转换和实时显示。通过试制的便携式管外检测装置实际测量和使用,验证了文章中所述设计思路的正确性。     

高地下水位条件下低路堤路基性能状态演化研究

通过水准仪观测以及传感器监测等方法对高水位条件下低路堤路基的湿度、土压力及沉降进行监测。结果表明,土体湿度、土压力及沉降受周围环境、气候条件及周边土体影响,平衡时湿度接近30约为30%,5个月后土压力趋于稳定,土压力值约为22.7 kPa,8个月后路基沉降趋于稳定,沉降值约为8.34 mm。低路堤路基技术在应用时应做好隔水措施。     

Common rail injection system iterative learning control based parameter calibration for accurate fuel injection quantity control

This paper presents an accurate engine fuel injection quantity control technique for high pressure common rail (HPCR) injection systems by an iterative learning control (ILC)-based, on-line calibration method. Accurate fuel injection quantity control is of importance in improving engine combustion efficiency and reducing engine-out emissions. Current Diesel engine fuel injection quantity control algorithms are either based on pre-calibrated tables or injector models, which may not adequately handle the effects of disturbances from fuel pressure oscillation in HPCR, rail pressure sensor reading inaccuracy, and the injector aging on injection quantity control. In this paper, by using an exhaust oxygen fraction dynamic model, an on-line parameter calibration method for accurate fuel injection quantity control was developed based on an enhanced iterative learning control (EILC) technique in conjunction with HPCR injection system. A high-fidelity, GT-Power engine model, with parametric uncertainties and measurement disturbances, was utilized to validate such a methodology. Through simulations at different engine operating conditions, the effectiveness of the proposed method in rejecting the effects of uncertainties and disturbance on fuel injection quantity control was demonstrated.