《轮机英语轮机长大管轮》_Lesson 14 The ME Engine.pptVIP

NewWordsandExpressionspurity[pj?r?ti]n.洁净度standstill[st?ndst?l]n.静止，停止cartridge[kɑrtr?d?]n.滤芯hydraulic[ha?dr?l?k]adj.液压的lubricate[lubr?ket]vt./vi.润滑Accumulator[?kjumj?let?]n.蓄能器Redundancy[r?d?nd?nsi]n.备用的、冗余的Booster[bust?]n.增压机NewWordsandExpressionsConsole[kɑnsol]n.控制台Actuator[?kt??,et?]n.执行器Auxiliary[?g?z?lj?ri]adj.辅助的Fig.1MEenginehydraulicoilloopTheMEenginecontrolconceptprimarilyconcernstheuseofamechanical/hydraulicsystemtoactivatethefuelinjectionpumpsandtheexhaustvalves,whichareelectronicallycontrolledbyacomputerbasedcontrolsystem(ME机型的控制理念主要关注的是运用基于计算机控制系统的电控机械/液压系统来驱动燃油喷射泵和排气阀).AlsothestartingairsystemiselectronicallycontrolledbytheMEcontrolsystem.Thehydraulicfuelinjectionandexhaustvalveactivationsystemsrequireahydraulicpowersupply.Thenormallubricatingoilisusedashydraulicmedium.Theoiliscleanedbyafilterunittotheappropriatepurityforuseinahydraulicoilsystem.Theoilisthenpressurizedeitherbyenginedrivenpumpswhentheengineisrotating,orbyelectricallydrivenpumpswhentheengineisatastandstill.Inthe‘SafetyandAccumulatorBlock’,pressurizedoilisaccumulatedtoensureastableoilsupplytotheHCUmountedateachcylinder.Fig.1showstheMEenginehydraulicoilloop(当机器运转时液压油被机带泵加压，当机器静止时则使用电机驱动的泵加压).1.HPSFig.2AtypicalHPSlayoutThemaincomponentsoftheHPSunitareself-cleaningfilter,redundancyfilter,electrically-drivenstart-uppumps,engine-drivenaxialpistonpumps,chainwheelandstep-upgear,etc.ThelayoutofatypicalHPSisshowninFig.2.Thepurposeoftheelectricallydrivenpumpsistoensureadequatehydraulicsystempressureinsituationswherethemainengineisnotrotatingandthusnotdrivingtheenginedrivenpumps.Theelectricallydrivenpumpsoperatewhenthereisnohydraulicoilconsumption.Therefore,onlyasmallcapacityisneededandthepumpsarethus