《汽车专业英语》课程教学资源（PPT课件讲稿，英文版）ELECTRONIC FUEL INJECTION（2）

PROFESSONAL ENGLISH: NEW TECHNOLOGIES ELECTRONIC FUEL INJECTION (2) e Electronic Throttle-Drive-By-Wire e GDi- -Gasoline direct Injection e Diesel Common Rail Injection System

ELECTRONIC FUEL INJECTION （2） Electronic Throttle—Drive-By-Wire GDI——Gasoline Direct Injection Diesel Common Rail Injection System PROFESSONAL ENGLISH: NEW TECHNOLOGIES

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New Words octane-rating 辛烷值 take advantage of 利用 运用 anti-knock index 抗爆指数 scope set 示波器 stipulate 约定，规定 Coast v.滑行 blank 空白（的） 空地 空虚的 approache v.接近 达到 stall 熄火 retard 延迟，推迟 mask 掩盖 overswing 尖峰 突增 jerk 急拉[动，撞，跳], 振 动（冲击） 颠簸地行进 rich 富的 浓的 丰富多彩的 enrichment 加浓 freedom 自由(度） 灵活性 freedom from 免除（于） turbocharge v.(涡轮)增压 turbo 涡轮 涡轮增压器 form v.形成 n.形式 形态 形 状 式样 ELECTRONIC FUEL INJECTION

ELECTRONIC FUEL INJECTION Electronic Throttle--Drive-By-Wire Some of the newest Motronic systems have an electronic throttle (also known as a drive-by-wire system). The electronic throttle has no mechanical link between the accelerator pedal and the throttle valve. Instead, as shown in the Figure on next page, an accelerator sensor picks up your movement or position of the accelerator pedal. It signals the control unit about pedal movement, and the control unit signals the servomotor on the throttle shaft to open The electronic throttle Bosch calls it EGAS) may sound like something none of us needs but it has many benefits sound like听起来好像

Electronic Throttle—Drive-By-Wire Some of the newest Motronic systems have an electronic throttle (also known as a drive-by-wire system). The electronic throttle has no mechanical link between the accelerator pedal and the throttle valve. Instead, as shown in the Figure on next page, an accelerator sensor picks up your movement or position of the accelerator pedal. It signals the control unit about pedal movement, and the control unit signals the servomotor on the throttle shaft to open. The electronic throttle (Bosch calls it EGAS) may sound like something none of us needs, but it has many benefits. ELECTRONIC FUEL INJECTION sound like 听起来好像

ELECTRONIC FUEL INJECTION Throttle-valve Fig.4-29 servomotor Control unit Electronic throttle sends accelerator signal to Motronic control unit DC motor throttle modified by engine temperature idle rpm, and Accelerator sensor maximum

Fig. 4-29. Electronic throttle sends accelerator signal to Motronic control unit . DC motor moves throttle valve, modified by engine temperature, idle rpm, and maximum rpm ELECTRONIC FUEL INJECTION

ELECTRONIC FUEL INJECTION e The throttle opening signal may be modified according to engine rpm and engine temperature. It can provide simplified cruise control. It can also control minimum rpm, replacing the idle-speed stabilizer, and control maximum rpm replacing the alternate-injector cut-out e But there's more. For traction control, the electronic throttle links with the ABS(Anti-lock Braking System). The same wheel- speed sensors of ABS also feed the ASR(Anti-Slip Regulator). e When any driving wheel starts to slip, a slight brake application prevents that wheel from slipping so much that the differential delivers no power to the other driving wheel. If both driving wheels show signs of slipping, the electronic throttle cuts back power for maximum traction. Traction control gives the car the max acceleration the tires can deliver to the road. If laying down tire smoke is your thing, avoid ASR, But for making the fastest takeoff, you cannot beat it. laying down主张,搁下,放弃beat冲击,敲打 trust相信,信赖

The throttle opening signal may be modified according to engine rpm and engine temperature. It can provide simplified cruise control. It can also control minimum rpm, replacing the idle-speed stabilizer, and control maximum rpm, replacing the alternate-injector cut-out. But there's more. For traction control, the electronic throttle links with the ABS (Anti-lock Braking System). The same wheel- speed sensors of ABS also feed the ASR (Anti-Slip Regulator). When any driving wheel starts to slip, a slight brake application prevents that wheel from slipping so much that the differential delivers no power to the other driving wheel. If both driving wheels show signs of slipping, the electronic throttle cuts back power for maximum traction.Traction control gives the car the max acceleration the tires can deliver to the road. If laying down tire smoke is your thing, avoid ASR. But for making the fastest takeoff, you cannot beat it. ELECTRONIC FUEL INJECTION laying down 主张，搁下，放弃 beat 冲击，敲打 trust 相信，信赖

ELECTRONIC FUEL INJECTION e Can you trust the electronic throttle? Will it provide unintended acceleration? The system checks its safety circuits before start-off, and reports defects to the driver. If a defect is found al limp-home circuit may disable some of the functions, but it will allow you to get to the house or the shop. It may well be more reliable than some cable actuated throttles trust相信,信赖 defect故障,缺点,毛病limp-home跛行回家

Can you trust the electronic throttle? Will it provide unintended acceleration? The system checks its safety circuits before start-off, and reports defects to the driver. If a defect is found, a limp-home circuit may disable some of the functions, but it will allow you to get to the house or the shop. It may well be more reliable than some cable actuated throttles. trust 相信，信赖 defect 故障，缺点，毛病 limp-home 跛行回家 ELECTRONIC FUEL INJECTION

ELECTRONIC FUEL INJECTION Gasoline Direct Injection Conventional gasoline engines are designed to use an electronic fuel injection system, replacing the traditional mechanical carburetion system. Multi-point injection(MPI), where the fuel is injected through each intake port is currently one of the most widely used systems. Although MPI provides a drastic improvement in response and combustion quality it is still limited due to fuel and air mixing prior to entering the cylinder. To further increase response time and combustion efficiency while lowering fuel consumption and increasing output, systems may use direct injection. gasoline direct injection engines are engineered to inject the gasoline directly into the cylinder in a manner similar to diesel direct injection engines

Gasoline Direct Injection Conventional gasoline engines are designed to use an electronic fuel injection system, replacing the traditional mechanical carburetion system. Multi-point injection (MPI), where the fuel is injected through each intake port, is currently one of the most widely used systems. Although MPI provides a drastic improvement in response and combustion quality, it is still limited due to fuel and air mixing prior to entering the cylinder. To further increase response time and combustion efficiency, while lowering fuel consumption and increasing output, systems may use direct injection. Gasoline direct injection engines are engineered to inject the gasoline directly into the cylinder in a manner similar to diesel direct injection engines. ELECTRONIC FUEL INJECTION

ELECTRONIC FUEL INJECTION e Direct injection is designed to allow greater control and precision resulting in better fuel economy. This is accomplished by enabling combustion of an ultra-lean mixture under many operating conditions. Direct injection is also designed to allow higher compression ratios delivering higher performance with lower fuel consumption. Currently direct injection gasoline engines are being deployed throughout the world in passenger cars. Mitsubishi gDi e Mitsubishi Motors is aiming to achieve both low fuel consumption and high output. MMc is a world forerunner in the development of direct cylinder injection gasoline engines, known as "GDI" which were first introduced in the 199 Galant. GDI supplies fuel directly to the inside of the cylinder a variety of air-fuel mixtures can be created according to changes in the fuel injection timing

Direct injection is designed to allow greater control and precision, resulting in better fuel economy. This is accomplished by enabling combustion of an ultra-lean mixture under many operating conditions. Direct injection is also designed to allow higher compression ratios, delivering higher performance with lower fuel consumption. Currently, direct injection gasoline engines are being deployed throughout the world in passenger cars. Mitsubishi GDI Mitsubishi Motors is aiming to achieve both low fuel consumption and high output. MMC is a world forerunner in the development of direct cylinder injection gasoline engines, known as "GDI", which were first introduced in the 1996 Galant. GDI supplies fuel directly to the inside of the cylinder (Figure). A variety of air-fuel mixtures can be created according to changes in the fuel injection timing. ELECTRONIC FUEL INJECTION

ELECTRONIC FUEL INJECTION GDI Engine Fig, 4-1 Layer separation of air and mixed air Mitsubishi direct A cylInder Spark injection plug Injector gasoline engine Rich Air/mixed ai Injection compression process

Fig.4-1 Mitsubishi direct cylinder injection gasoline engine ELECTRONIC FUEL INJECTION

ELECTRONIC FUEL INJECTION

ELECTRONIC FUEL INJECTION