汽车专业英语课件与汽车专业英语读译教程2版配套8U4TB.pptVIP

UNIT 4GASOLINE FUEL INJECTION  TEXT B Operation of the Motronic System   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 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 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 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-Star