GASOLINE FUEL INJECTION车辆工程专业英语教学PPT课件.pptx

 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;本次课学习目标;NEW WORDS;endanger [indein??] v.危及 trait [treit] n.特性，显著的特点 harmonics [hɑ:m?niks] n.谐波[音]，谐波分量 recognition [rek?gni∫(?)n] n.承认，赏识，赞誉 modify [m?difai] v.更改，修改 stratification [?str?tifikei∫?n] n.成层，分层 cutback [k?tb?k] n.减少 scope [skoup] n.范围，领域，见识，示波器，指示器 simultaneous [sim?lteinj?s] a.同时的，同时发生的，同步的;coast [koust] v.滑行，滑翔，沿海岸航行；n.海岸，沿岸 cut-off [k?t?f] n.切断，关闭，停车 coastdown [koustdaun] n.降低，下降，滑行 blank [bl??k] ad.空白的，空着的，没有表情的；n.空白 stall [st?:l] v.失速，熄火，（速度不够）停车[停止转动] refinement [rifainm?nt] n.精致，文雅，精巧 resume [rizju:m] v.恢复, 重新开始 ;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;Operation of the Motronic System 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]. 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