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ID:31743472
大小:53.27 KB
页数:7页
时间:2019-01-17
《仪表及指示系统》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、Chapter7InstrumentandIndicatorSystem1.InstrumentsystemInstrumentsystemisusedtoindicatetheoperatingconditionofengineandvehicle.Itincludesvariousmetersorgaugesontheinstrumentpanel,suchas:•speedometer•odometer•tripodometer•tachometer•coolanttemperaturegauge•ampereme
2、ter(orvoltmeter)•fuelgauge•oilpressuregauge•airpressuregauge(forairpressurebrakingsystem),etc・2.IndicatorsystemIndicatorsystemisusuallyusedtomonitortheabnormalorlimitedoperatingconditionofengineandvehicle.Itincludesvariouswarningorindicatorlightsandchimes,suchas:
3、•Oilpressurewarninglight•Lowairpressurewarninglight(forairpressurebrakingsystem)•Lowvacuumwarninglight(forvacuumbrakebooster)•Lowbrakefluidwarninglight•Brakingsignalwarninglight•Aircleanerjamwarninglight•Lowfuelwarninglight•Exhaustbrakeindicatorlight(forexhaustbr
4、akesystem)•Turnsignal/hazardindicatorlight•Highbeamindicatorlight•Chargingindicatorlight•Seatbeltreminderlight•Glowplugindicatorlight(fordieselengine)•Lowwasherfluidindicatorlight•Waterinfuelfilterwarninglight(fdrdieselengine)•Rearwindowdefoggerindicatorlight•4-w
5、heeldriveindicatorlight(for4-wheeldrivevehicle)•A/Toiltemperaturewarninglight(forautomatictransmission)•Engineoiltemperaturewarninglight,etc.3.Speedometerandodometer3.1FunctionofspeedometerandodometerSpeedometer一Itindicatesvehiclespeed.Odometer一Itrecordsthetotald
6、istancethevehiclehasbeendriven.3.2Constructionofspeedometerandodometer(magneticinductiontypeforexample)SeeFig.7-11onpage2121-permanentmagnet2-metal(aluminium)ring3-magneticscreen4・coilspring5-speedometerface6-pointer7-numberrings(decimalodometer)8,9-wormgears10-d
7、rivingshaft1.1OperatingprincipleThemagnetisdrivenbyaflexiblecablefromthetransmission.Thefasterthecargoes,thefasterthemagnetspins.Thisactionproducesarotatingmagneticfieldthatdragsonthemetalringsurroundingthemagnet.Thefasterthespinning,themoredragonthering.Thespinn
8、ingcausestheringtoswingaroundagainstthetensionofaspring.This,inturn,movesapointerattachedtothering,whichindicatescarspeed・Theodometerisoperatedbyapairofgearsfr
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