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1、 UNIT 4GASOLINE FUEL INJECTION TEXT B Operation of the Motronic System PROFESSIONAL ENGLISH UNIT 4 GASOLINE FUEL INJECTION TEXT B Operation of the Motronic System Start Control(Fuel,Ignition Timing,Air)Post-Start Warm-Up Closed-Loop Operation Part-Throttle Acceleration Full-Load Acceleration Knock C
2、ontrol RPM Limitation Coasting Cut-Off本次课学习内容本次课学习目标l掌握MOTRONIC系统的控制原理l掌握有关控制原理的专用术语l了解翻译技巧句子成分转换NEW WORDSfloodfldv.充满，淹没，溢出；充满，淹没，溢出；n.洪水洪水compensatekmpenseitv.补偿，偿还补偿，偿还formationf:meinn.形成，形成量形成，形成量turbocharget:bout:v.用涡轮增压用涡轮增压turbotboun.涡轮增压，涡轮增压器涡轮增压，涡轮增压器intercoolerintku:ln.中间冷却器，中冷器中间冷却器，中冷器s
3、ensesensv.理解，感到，感受，检测理解，感到，感受，检测overrideouvraidv.超超过过（越越），越越过过，压压倒倒，占占优势优势overswingouvswiv.摆动过大摆动过大lambdalmdn.值值，过过量量空空气气系系数数，氧氧传传感感器器NEW WORDSfloodfldv.充满，淹没，溢出；充满，淹没，溢出；n.洪水洪水compensatekmpenseitv.补偿，偿还补偿，偿还formationf:meinn.形成，形成量形成，形成量turbocharget:bout:v.用涡轮增压用涡轮增压turbotboun.涡轮增压，涡轮增压器涡轮增压，涡轮增压器in
4、tercoolerintku:ln.中间冷却器，中冷器中间冷却器，中冷器sensesensv.理解，感到，感受，检测理解，感到，感受，检测overrideouvraidv.超超过过（越越），越越过过，压压倒倒，占占优势优势overswingouvswiv.摆动过大摆动过大lambdalmdn.值值，过过量量空空气气系系数数，氧氧传传感感器器endangerindeinv.危及危及traittreitn.特性，显著的特点特性，显著的特点harmonicsh:mniksn.谐波谐波音音，谐波分量，谐波分量NEW WORDSrecognitionrekgni()nn.承认，赏识，赞誉承认，赏识，赞誉
5、modifymdifaiv.更改，修改更改，修改stratificationstrtifikein n.成层，分层成层，分层cutbackktbkn.减少减少scopeskoupn.范围，领域，见识，示波器，指示器范围，领域，见识，示波器，指示器simultaneoussimlteinjsa.同时的，同时发生的，同步的同时的，同时发生的，同步的coastkoustv.滑滑行行，滑滑翔翔，沿沿海海岸岸航航行行；n.海海岸岸，沿岸沿岸cut-offktfn.切断，关闭，停车切断，关闭，停车coastdownkoustdaunn.降低，下降，滑行降低，下降，滑行blankblkad.空空白白的的，空
6、空着着的的，没没有有表表情情的的；n.空空白白stallst:lv.失失速速，熄熄火火，（速速度度不不够够）停停车车停停止止转动转动refinementrifainmntn.精致，文雅，精巧精致，文雅，精巧resumerizju:mv.恢复恢复,重新开始重新开始PHRASES AND EXPRESSIONSport injector进气道喷油器进气道喷油器start injector起动喷油器，冷起动喷油器起动喷油器，冷起动喷油器thermo-time switch温控定时开关温控定时开关turbocharged car涡轮增压轿车涡轮增压轿车air-fuel ratio空燃比空燃比knock
7、 sensor爆燃传感器爆燃传感器passenger compartment乘客舱，乘员室乘客舱，乘员室knock control regulator爆燃控制调节器爆燃控制调节器be sorted from与与分开，从分开，从拣出拣出scope set示波器示波器In this section,lets look at operating conditions to see how Motronic controls injection and ignition as well as idle-speed bypass air for good engine management 1.Star
8、tingStart Control,Fuel In most Motronics,start enrichment is provided by the port injectors rather than the separate start injector/thermo-time switch.For start control,the important inputs are rpm and engine temperature.The control unit monitors cranking rpm,and also the number of revolutions since
9、 the time cranking began 2.The injection pulses may be longer than normal.Operation of the Motronic SystemOperation of the Motronic SystemBut at low engine temperatures,the control unit may deliver instead several shorter injection pulses per revolution to improve starting.Remember,these are 10 mill
10、isecond pulses in a pulse period,or crankshaft revolution time of 200ms.For hot starts,or high intake air temperatures,timing will be retarded because a hot cylinder can fire easier while the piston is rising at cranking rpm.Retarded timing prevents knocking that can occur in high-compression engine
11、s,and may be masked by the starter sound.Operation of the Motronic SystemTo prevent flooding,fuel quantity will cut back after a measured number of revolutions,or after the engine has reached a cranking rpm that is temperature related,for example 200-300 rpm.Start Control,Ignition Timing With a cold
12、 engine at low cranking speeds,timing will be controlled near TDC.For normal cranking rpm,a large advance in timing might fire too early,damaging the starter.Further,starting would be difficult if not impossible.With a cold engine at higher cranking rpm,however,timing will be advanced for better sta
13、rting.Operation of the Motronic SystemStart Control,Air As in L-Jetronic,the idle-speed stabilizer is normally driven open more by increased dwell signals to provide extra bypass air for cold starting.Post-Start Post-start-the 5-30 seconds when you want the engine to keep running after you release t
14、he key from CRANK-is affected by engine temperature as well as a timer in the control unit.Colder engines get more fuel injected.Also,colder engines get more timing advance.Based on the start-up temperature,and the time since start,post-start enrichment is gradually reduced.The idle-speed stabilizer
15、 maintains rpm.Operation of the Motronic SystemWarm-Up During warm up,the most important input,besides engine load and rpm for basic pulse time,is engine temperature.The control unit includes a ROM map of warm-up characteristics to apply a correction factor based on load and engine speed,greater at
16、low loads and rpm than at high loads and rpms 3,See Fig.4-7.Control unit outputs include injection pulses for the proper mixture,ignition timing for driveability(advance under part-load acceleration,retard on deceleration to reduce HC emissions),and idle stabilization to help keep the engine running at idle.Operation of the Motronic SystemRemember,during warm-up,the temperature of the lambda sensor is important.Unheated lambda sensors can be heated faster by changing ignition timing.Motronic ret
