插接器引发的故障及启示

故障一 故障现象:一辆86型切诺基汽车,行驶里程90000km.在行驶中,发动机突然熄火,将汽车停在路边休息一会,再打开点火开关,汽车又能起动行驶;有时中途熄火后,即使休息的时间再长,也无论如何都不能将发动机起动.当遇到这种情况时,驾驶员就打开发动机罩盖,将起动继电器周围的线束摆弄几下,再进行起动,发动机就能起动了,并且这种现象在冷天发生的机会较多.     

该帕萨特B5型汽车自动变速器为何偶尔加不上速

故障现象：一辆帕萨特B5型汽车,使用01N型变速器。该车在正常行驶时使用制动后．再加油就会出现发动机空转的现象．当上坡时也会出现发动机空转的现象,但在平路上行驶时加速正常。     

病车诊所

BJ2020型汽车发动机排气管冒白烟且难起动故障特例 ● 邱新华 故障现象:一辆BJ2020型汽车,行驶不久即感到发动机动力不足,停车后便起不了步,而且出现回火、放炮和排气管冒白烟现象,熄火后再也无法起动。 故障检查:经检查,高压火花、化油器、气缸压力均正常;拆下火花塞发现油迹、积炭比较多;更换一组火花塞后起动发动机,动力仍     

本田雅阁发动机高转速抖动故障排除

正一、故障现象有1辆2001年生产的本田雅阁轿车,装备型号为R23A3的直列4缸发动机,行驶里程为19万km。车主反映,汽车在低速状态时,车辆行驶正常;当汽车加速时,发动机的转速达到3000 r/min左右,发动机会严重抖动,并且再踩加速踏板,发动机的转速不能继续升高,发动机故障灯     

东风EQ1141G怠速运转时,一会儿就自行熄火

故障现象:东风EQ1141G型汽车在行驶中发现,当发动机高速运转时汽车行驶正常,但是当发动机怠速运转时,一会儿就自行熄火。在排除油路中的空气后,发动机又能起动着车。 故障分析:根据上述故障现象,发动机怠速运转一会儿,就自行熄火,说明油路中在低速时进入空气     

桑塔纳2000Gsi关钥匙难熄火

故障现象:桑塔纳2000Gsi,最近经常出现关闭点火开关后,发动机还能运转几下,难以熄火,严重时要挂档松离合器才能熄火的怪病。 故障诊断:此车是城市出租车,经常在中速以下区域行驶,而且使用燃油标号相对控制不严格。问询车主,此车已行驶180000km。长时间在低转速行驶后极易在进气门,进气歧管,活塞顶部形成厚重积炭,此积炭层影响进     

桑塔纳2000GSi型轿车电路故障1例

故障现象一辆桑塔纳2000GSi型轿车装用的发动机为直立4缸汽油喷射AJR型,该车在行驶过程中有时突然出现发动机抖动现象,轻时抖动几下,严重时汽车无法正常行驶,只能用变速器二档或半离合勉强行驶.有时出现发动机熄火后起动困难.     

皇冠3.0轿车高速惰车故障排除

故障现象 一辆丰田汽车公司1993年生产的皇冠牌JZSl33L—AEPGFV型轿车，装备2JZ—GE型发动机，A340E型自动变速器，已行驶40多万km。该车在中、低速行驶时，车速小于80km／h，行驶正常，但是当汽车行驶速度达到100km／h以上时就会出现严重的惰车现象，并且在急加速的时候，发动机转速及汽车行驶速度提高缓慢，排气管内可以听到较清晰的放炮声。     

丰田子弹头发动机自动熄火故障

故障现象：一辆92款的丰田子弹头汽车在行驶约100公里时，发动机自动熄火，发动机熄火前有发抖、加速无力的现象。将点火开关天闭后，再打开重新起动，汽车行驶几十公里仍自动熄火。如此反复，汽车行驶的距离越来越短，即发动机自动熄火的频率加快。到后来，汽下仅能行驶1公里左右发动机就自动熄火。     

延安SX2150型汽车上坡发动机熄火故障的排除

故障现象：一辆延安SX2150型汽车,平路行驶时,发动机勉强能维持车辆正常行驶。上坡时,排气管却冒黑烟,而且发动机动力明显下降。严重时,发动机突然熄火。而用电动燃油泵泵油冲坡时,发动机动力明显好转。否则,故障又将出现。     

南汽NJ8140.43C轻型车用柴油机的排放特性

通过试验分析了南汽NJ8140.43C增压中冷柴油机的排放特性。指出其CO及HC排放量总的来说比较低;NOx排放量随着负荷的增大而迅速升高,高速时较低速时有所降低;微粒排放中碳烟排放占绝大部分。微粒比排放中,小负荷是有机可溶成分为主,高速大负荷时碳烟为主。     

Transient characteristics of emissions during engine start/stop operation employing a conventional gasoline engine for HEV application

In this paper, we investigate the transient characteristics of combustion and emissions during engine start/stop operations in hybrid electric vehicle (HEV) applications. Hydrocarbon (HC) emissions during the initial 2^nd∼9^th cycles are found to be significantly greater when the engine is quickly started under the original engine calibration mode. Lower intake manifold absolute pressure (MAP) was also found to cause larger residual gas dilution and poor combustion, resulting in a higher HC concentration when the cranking speed was increased. The post-catalyst HC concentration was found in the way of initially decrease and then to increase again as the cranking speed was increased. A lowest concentration value was achieved at a cranking speed of 1000 r/min. Engine shut-down by fuel cut-off was shown to produce lower emissions than shut-down by ignition cut-off as one can avoid misfire of the last fuel injection cycle. The fuel deposited during the stop process seems to impact engine restart enrichment mostly during the initial 0.7 s for this engine, whose performance is dominated by the MAP transition characteristic and the time coefficient for fuel vaporization in this time period     

DOC对柴油机排放微粒中碳质组分的影响

针对一款装有DOC的柴油机,利用IMPROVE(Interagency M0nitoring 0f Protected Visual Environment)TOR方法对排放微粒的碳质组分进行试验研究.结果表明:碳质组分的排放速率均随着负荷的增加而增加,随着转速的增加,负荷的变化对碳质组分的影响更加明显;随着负荷的增加...     

Engine performance powered by a mixture of hydrogen and oxygen fuel obtained from water electrolysis

In this work, the performance of an SI engine powered with both gasoline and HHO as supplement fuel was studied and compared with pure gasoline-fuelled engine. The amount of HHO gas quantities added was 1, 1.5, and 2 LPM. The engine speed was varied from 1350 to 2250 rpm. The performance was found by measuring the engine torque, the brake power, the brake specific fuel consumption and the thermal efficiency, while gas analyzer was used to measure the amounts of nitrogen oxides and carbon dioxide that are emitted from the engine during operation. It was found that the engine performance was best when 2 LPM HHO gas was used with pure gasoline fuel. Further, it was found that, at high amount of HHO gas addition, the nitrogen oxide decreases. Further, the CO level increased when using HHO gas as supplement fuel.     

基于局部线性模型树的高压共轨柴油机排放模型

为研究面向闭环控制的柴油机在线排放模型,以1台高压共轨、涡轮增压中冷柴油机的转速、扭矩、空燃比、燃烧始点、燃烧重心、燃烧终点、最高燃烧温度、最大缸内压力等运转和燃烧的各项参数为基础,运用局部线性模型树对排放物HC,CO,CO2,NOx和烟度进行了仿真研究。研究结果表明,以转速、扭矩、空燃比为输入时,CO,CO2,NOx的仿真结果与试验值具有较好的一致性,以转速、扭矩、空燃比、燃烧重心为输入时,HC、烟度的仿真结果与试验值具有较好的一致性。各排放的期望响应与仿真输出的平均误差在10%以内,线性回归相关系数达到0.96以上。各个排放物的仿真过程单独进行时,可以得到较好的仿真效果。因此,局部线性模型树模型适用于高压共轨柴油机排放物的仿真。     

Lubricating performance of carbon nanotubes in internal combustion engines – engine test results for CNT enriched oil

The main purpose of this research is to reduce friction losses by adding carbon nanotubes to engine oil. Extremely favorable tribological properties of carbon nanotubes have been extensively studied on the microscopic scale and using tribometers, have not yet been verified in the engine. Enriching oil with nanotubes can lead to significant, exceeding 7 %, reduction in the motoring torque of the engine at low crankshaft rotational speed. The phenomena associated with the dispersion of carbon nanotubes in the engine are stated and discussed. It has been shown that the oil shear during normal operation of the engine can effectively improve the dispersion of nanotubes. At the same time the oil filtration system removes agglomerates of nanotubes very quickly.     

柴油机动态过程的非线性特性分析

建立了柴油机调速的非线性模型并进行了试验研究,以此模型为研究对象,采取了广义频率响应函数方法对柴油机系统动态过程的非线性特性进行了分析,指出了在转速变化范围小于100r/min时,柴油机系统表现出线性特征;在转速变化大于150r/min时,系统的非线性特征较为明显。     

中冷器布置对增压发动机动力性能的影响

中冷器的布置优化是提升增压发动机性能的重要手段。结合某SUV匹配汽油增压发动机的动力不足问题,分析进气阻力及中冷后进气温度的变化对发动机性能的影响,通过台架试验对比2种中冷器布置方案引起的发动机动力性能的变化,结果表明,前置式中冷器相对顶置式在全速全负荷工况下中冷后进气温度降低17.4℃,发动机功率提升3%,扭矩提升5.2%。文章通过优化中冷器的布置为发动机性能提升提供了方向。     

混合动力汽车发动机起动/停机控制

介绍了采用继电器对发动机管理系统ECU的工作进行控制,同时针对发动机管理系统原有的减速断油模式进行了重新标定,实现了发动机高转速起动功能,且降低了停机时的转速,避免了对发动机ECU频繁的通/断电操作及因频繁起动造成的发动机燃油消耗率和排放性能的不良影响。     

转速对甲醇HCCI燃烧特性的影响试验研究

在一台双缸4冲程柴油机上实现了甲醇均质压燃的试验,分析了发动机转速对甲醇均质压燃燃烧特性的影响。试验结果表明：过量空气系数和进气温度一定的情况下,随着发动机转速在一定范围内的升高,缸内压力、压力升高率和放热率均有所升高,且存在一个最佳的转速,使得压力、压力升高率和放热率处在较好的水平。