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1、机械电气工程学院本科毕业设计(论文)题目：院（系）：专业：学号：姓名：指导教师：完成日期：2013年6月摘要电控高压共轨式燃油喷射系统是现代柴油机燃油系统的发展方向,为了研究其可靠性,本研究给出了一个高压共轨系统可靠性测试平台的设计方案。该平台还可以和部件性能试验平台相结合,进行部件的可靠性测试。在保证其他部件可靠的前提下,被测部件先在该平台上进行长时间运行,然后再转到部件性能试验台上进行性能测试从而判断其可靠性.根据系统部件的常见故障来设定系统的可靠性判据。被测的高压共轨系统由高压油泵、高压油管、共轨管、喷油器组成。燃油进入高压油泵,经泵压缩
2、后由高压油管进入共轨管,最后从喷油器喷出。高压油泵的常见故障有密封不良与柱塞副咬死等,密封不良会导致燃油泄漏,柱塞副咬死会导致油泵不供油,因而轨压会迅速下降,同时电机的驱动扭矩也会迅速升高。高压油管的破裂将直接导致燃油泄漏,同时轨压也将迅速下降。喷油器常见的故障有喷油器堵塞或泄漏、电磁线圈老化等,这些故障都将导致喷油量的不正常,通过比较各缸喷油量可判断喷油器是否正常工作。故轨压稳定、各缸喷油量均匀、扭矩不超限、没有泄漏时认为系统可靠。关键词：液压支架有限元分析全套图纸，加AbstractCommonrailfuelelectriccontrol
3、ledhigh-pressureinjectionsystemisthedevelopmentdirectionofmoderndieselfuelinjectionsystem,inordertostudythereliability,thisstudygivesthedesignschemeofahighpressurecommonrailsystemofreliabilitytestplatform.Theplatformcanalsoplatformandcomponentsperformancetestcombination,reli
4、abilitytestingofcomponent.Underthepremiseofensuringotherpartsunderthefirstreliable,longtimerunningontheplatformcomponentstobemeasured,thengotothecomponentperformancetestbenchforperformancetestingtojudgethereliability.Tosetthereliabilitycriterionsystemaccordingto29thecommonfa
5、ultsofthesystemcomponents.Highpressurecommonrailsystemwasmeasuredbyahighpressureoilpump,highpressureoilpipe,commonrailpipe,anoilatomizer.Thefueltothehigh-pressurepump,throughthepumpaftercompressionbyhigh-pressuretubingintothecommonrailpipe,andfinallyfromtheinjectorstospray.T
6、hecommonfaultsofhighpressureoilpumpplungerpairhasbadsealingandseizure,badsealingleadtofuelleakage,willcausethepumpplungerpairkillednooilsupply,sotherailpressuredecreasedrapidly,atthesametime,thedrivingtorqueofthemotorwillincreaserapidly.Ruptureofthehigh-pressureoilpipewillle
7、addirectlytoafuelleak,andrailpressurewillalsodecreaserapidly.Thefaultinjectorarecommoninjectorblockageorleakage,electromagneticcoilaging,thesefaultswillcausethefuelinjectionquantityisnotnormal,bycomparingthecylinderfuelinjectionquantitycandeterminewhetherthenormalworkofthefu
8、elinjector.Therailpressurestable,eachcylinderinjectionquantityequality,torq
