PROFESSIONAL ENGLISH UNIT 4 GASOLINE FUEL INJECTION TEXT B Operation of the Motronic system
UNIT 4 GASOLINE FUEL INJECTION TEXT B Operation of the Motronic System PROFESSIONAL ENGLISH
本次课学习内容 UNIT 4 GASOLINE FUEL INJECTION TEXT B Operation of the Motronic System Start Control( Fuel, Ignition Timing, Air) e Post-Start Warm-Up e Closed-Loop Operation . Part-Throttle acceleration e Full-Load Acceleration ● Knock Control ● RPM LImitation ● Coasting Cut-off
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 Control • RPM Limitation • Coasting Cut-Off 本次课学习内容
本次课学习目标 ●掌握MTR0NIC系统的控制原理 ●掌握有关控制原理的专用术语 ●了解翻译技巧—句子成分转换
本次课学习目标 ⚫ 掌握MOTRONIC系统的控制原理 ⚫ 掌握有关控制原理的专用术语 ⚫ 了解翻译技巧—句子成分转换
NEW WORDS flod[flAd]v充满,淹没,溢出;n.洪水 compensate[ kompenseit补偿,偿还 formation[:mei∫jen]n形成,形成量 turbocharge[te:bout∫α:d]v用涡轮增压 turbo [tabou n涡轮增压,涡轮增压器 intercooler [inte ku:l]n中间冷却器,中冷器 sense[sens]v理解,感到,感受,检测 override[ouve'raid]超过(越),越过,压倒,占优势 overswing[ouve' swin]v摆动过大 lambda [land]nA值,过量空气系数,氧传感器
NEW WORDS flood [flʌd] v.充满，淹没，溢出；n.洪水 compensate ['kɔmpenseit] v.补偿，偿还 formation [fɔ:'mei∫ən] n.形成，形成量 turbocharge ['tə:bout∫ɑ:ʤ] v.用涡轮增压 turbo ['təbou] n.涡轮增压，涡轮增压器 intercooler [intə'ku:lə] n.中间冷却器，中冷器 sense [sens] v.理解，感到，感受，检测 override [ouvə'raid] v.超过（越），越过，压倒，占优势 overswing [ouvə'swiŋ] v.摆动过大 lambda ['læmdə] n. λ值，过量空气系数，氧传感器
endanger [in'deinda]v危及 trait [treit]n特性,显著的特点 harmonics[ha: monks]n谐波[音],谐波分量 recognition[ rekeg'ni∫()n]n承认,赏识,赞誉 modify["m。difa]v更改,修改 stratification[ straetifi'keijen]n成层,分层 cutback[ kAtbaek]n减少 scope[ soup]n范围,领域,见识,示波器,指示器 simultaneous[ simal teinjas]a同时的,同时发生的,同 步的
endanger [in'deinʤə] v.危及 trait [treit] n.特性，显著的特点 harmonics [hɑ:'mɔniks] n.谐波[音]，谐波分量 recognition [rekəg'ni∫(ə)n] n.承认，赏识，赞誉 modify ['mɔdifai] v.更改，修改 stratification [ֽstrætifi'kei∫ən] n.成层，分层 cutback ['kʌtbæk] n.减少 scope [skoup] n.范围，领域，见识，示波器，指示器 simultaneous [siməl'teinjəs] a.同时的，同时发生的，同 步的
coast [kous]v滑行,滑翔,沿海岸航行;n海岸,沿岸 cut- off [kAtef] n切断,关闭,停车 coastdown[ koustdaun] n降低,下降,滑行 blank[ blaen k ad空白的,空着的,没有表情的;n.空自 stall [st:v失速,熄火,(速度不够)停车[停止转动] refinement [ri' fainman]n精致,文雅,精巧 resume[ riZu:]恢复,重新开始
coast [koust] v.滑行，滑翔，沿海岸航行；n.海岸，沿岸 cut-off ['kʌtəf] n.切断，关闭，停车 coastdown ['koustdaun] n.降低，下降，滑行 blank [blæŋk] ad.空白的，空着的，没有表情的；n.空白 stall [stɔ:l] v.失速，熄火，（速度不够）停车[停止转动] refinement [ri'fainmənt] n.精致，文雅，精巧 resume [ri'zju:m] v.恢复, 重新开始
PHRASES AND EXPRESSIONS port injector进气道喷油器 start injector起动喷油器,冷起动喷油器 thermo- time switch温控定时开关 turbocharged car涡轮增压轿车 air- fuel ratio空燃比 knock sensor爆燃传感器 passenger compartment乘客舱,乘员室 knock control regulator爆燃控制调节器 be sorted from与.分开,从..出 scope set示波器
port injector 进气道喷油器 start injector 起动喷油器，冷起动喷油器 thermo-time switch 温控定时开关 turbocharged car 涡轮增压轿车 air-fuel ratio 空燃比 knock sensor 爆燃传感器 passenger compartment 乘客舱，乘员室 knock control regulator 爆燃控制调节器 be sorted from 与…分开，从…拣出 scope set 示波器 PHRASES AND EXPRESSIONS
Operation of the Motronic System In this section, let's look at operating conditions to see how Motronic controls injection and ignition as well as idle speed bypass air for good engine management [11 Starting Start 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 the time cranking began [2]. The injection pulses may be longer than normal But at low engine temperatures, the control unit may deliver instead several shorter injection pulses per revolution to improve starting. Remember, these are 10 millisecond pulses in a pulse period, or crankshaft revolution time of 200ms
Operation of the Motronic System In this section, let's look at operating conditions to see how Motronic controls injection and ignition as well as idlespeed bypass air for good engine management [1]. Starting Start 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 the time cranking began [2]. The injection pulses may be longer than normal. But at low engine temperatures, the control unit may deliver instead several shorter injection pulses per revolution to improve starting. Remember, these are 10 millisecond pulses in a pulse period, or crankshaft revolution time of 200ms
To 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 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 starting 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 engines, and may be masked by the starter sound
To 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 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 starting. 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 engines, and may be masked by the starter sound
Start 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 the key from CraNK-is affected by engine temperature as well as a timer in the control unit. Colder engines get more fuel injected. Also, aN colder engines get more timing advance. Based on the sta up temperature, and the time since start, post-start enrichment is gradually reduced. The idle-speed stabilizer maintains rpm
Start 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 the 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 startup temperature, and the time since start, post-start enrichment is gradually reduced. The idle-speed stabilizer maintains rpm