简介:一辆三菱帕杰罗越野车装备了4G64发动机,因发动机怠速工作不良,发动机大负荷及加速时不良而进厂维修.进行了清洗化油器、更换火花塞等工作后怠速仍然不稳,反而比维修前的工作情况还要差.开始认为是在对化油器的清洗维修中造成了故障,对化油器进行了几次检查调试,均没有任何变化.对发动机进行单缸断火的方法进行检查,发现第4缸断火后发动机的转速不但不降低反而会升高并变得平稳一些.3缸在断火后发动状况无明显变化,2缸在断火后变化特别明显,1缸断火后有变化但不如2缸.怀疑分缸高压线或分电器盖有漏电现象,换上一组确认无故障的缸线及分电器盖后故障仍然存在.再查了配气机构及配气正时等均没发现什么问题.
简介:Theeffectofλ/2SiO2overcoatonthelaserdamagecharacteristicsofHfO2/SiO2high-reflector(HR)coatingsisinvestigatedwith1-on-1andN-on-1laserdamagetestmethods.Thelaserdamagesurfaceof1-on-1isanalyzedbyastepanalyzer.ThesurfacemorphologiesshowthatlaserdamagemakesthecoatingdamagedareaprotrudentandroughforHRcoatingwithoutλ/2silicaovercoat,butconcaveandsmoothforHRcoatingwithλ/2silicaovercoat.Theresultof10-on-1multi-pulseirradiationonthesamepointofthecoatingshowsthatthereisanenergydensitystageonthedamagecurve.Ifthelaserenergydensityiswithintherangeofthestage,HfO2/SiO2HRcoatingswithλ/2silicaovercoatwillnotbedamagedmorethan2timesformulti-shots,andthesurfacedamagesareveryslightsothatthereisnoimpactonthecoatingperformance.Anotherinterestingresultisthattheenergydensitystageextendsfromthedamagethresholdtothepointofabout3timesofthreshold,whichissimilartotheeffectofthelaserconditiononcoating.