汽车专业英语（黄立新）第二部分4章

1、背景知识背景知识 生词生词Unit 4 Fuel System译文及评析译文及评析 背景知识背景知识 燃油喷射系统是指在一定的压力下，利用喷油器将一定数量的燃料直接喷入气缸或进气道内的燃油供给装置。根据喷射燃料种类的不同，可以分为汽油喷射系统、柴油喷射系统、气体燃料喷射系统等。而根据其控制方式的不同，可分为机械控制式、电子控制式以及机电混合控制式。生词生词carburetor n.化油器 injection n.喷射；注射supply v.供给，补给 combustible adj.易燃的injector n.喷油器 contaminant n.污染物；致污物subsystem n.子系统；次

2、要系统 sensor n.传感器hose n.软管 preset adj.预先装置的；预先调整的energize vt.供给能量 spring n.弹簧current n.(水，气，电)流 coil n.卷；线圈solenoid n.螺线管；螺线形电导管 magnetic adj.有磁性的armature n.(电机的)转子，电枢 squirt v.注射；喷射 throttle n.节流阀 pedal n.踏板depress vt.压低 circuit n.电路resistance n.抵抗；抵抗力；反抗；电阻；阻力voltage n.电电压译文及评析译文及评析 The function of

3、 both the carburetor fuel system and the fuel injection system is to supply a combustible mixture of air and fuel to the engine. A gasoline fuel system draws fuel from the tank and forces it into the fuel-metering device(carburetor, gasoline injectors), using either a mechanical(engine-driven) or el

4、ectric fuel pump. The basic parts of a fuel supply system include the following: Fuel Tank: stores gasoline.Fuel Pump: draws fuel from the tank and forces it to the fuel-metering device.Fuel Filter: removes contaminants in the fuel.Fuel Line: carries fuel between the tank, the pump, and other parts.

5、过了一会，小男孩不哭了，睁开眼睛，过了一会，小男孩不哭了，睁开眼睛，用询问的目光看着越南护士。用询问的目光看着越南护士。 柴油机供给系统和汽油机供给系统的主要功用都是将燃油或者油气混合物喷入发动机气缸内。汽油机供给系统从油箱吸取燃油利用机械式（发动机驱动）或电控式燃油泵提供高压使燃油进入燃油计量装置（化油器，汽油喷射器）。燃油供给系统主要包括四个部分： 油箱：存储燃油。 燃料泵：从油箱吸取燃料并将迫使其进入上述燃料计量装置。 燃油滤清器：滤除燃料杂质。 油管：连接油箱，油泵和其他部分。译文及评析译文及评析 The more common type of timed fuel injection

6、 is the electronic-timed fuel injection, also known as electronic fuel injection(EFI), as shown. An electronic fuel injection system can be divided into four subsystems: (1) Fuel delivery system.(2) Air induction system.(3) Sensor system.(4) Computer control system.过了一会，小男孩不哭了，睁开眼睛，过了一会，小男孩不哭了，睁开眼睛，

7、用询问的目光看着越南护士。用询问的目光看着越南护士。 电子定时燃油喷射，又叫电控燃油喷射是最常见的定时喷射系统。电控燃油喷射系统主要包括燃油供给、空气供给、传感器系统和控制器单元。译文及评析译文及评析 The fuel pressure regulator controls the amount of pressure entering the injector valves. When sufficient pressure is attained, the regulator returns excess fuel to the tank. This maintains a preset

8、amount of fuel pressure for injector valve operation.掌握基本的名词词汇及上文内容掌握基本的名词词汇及上文内容过了一会，小男孩不哭了，睁开眼睛，过了一会，小男孩不哭了，睁开眼睛，用询问的目光看着越南护士。用询问的目光看着越南护士。 燃油压力调节器主要功用是调节喷油器与冷起动阀的燃油压力，是燃油压力与进气管压力之差保持常数。当燃油压力大于喷油阀预定压力值时，回油孔将打开，燃油流回油箱。译文及评析译文及评析 The fuel injector for an EFI system is a coil or solenoid-operated fue

9、l valve. When not energized, the spring pressure keeps the injector closed, keeping fuel from entering the engine. When current flows through the injector coil or solenoid, the magnetic field attracts the injector armature. The injector opens, squirting fuel into the intake manifold under pressure.掌

10、握上文基本内容。掌握上文基本内容。过了一会，小男孩不哭了，睁开眼睛，过了一会，小男孩不哭了，睁开眼睛，用询问的目光看着越南护士。用询问的目光看着越南护士。 电控喷射系统的喷油器中有一个电磁线圈，当发动机未启动时，弹簧压力作用下，喷油器处于关闭状态。当发动起启动后，电控单元发出指令信号可讲喷油器头部的针阀打开，将准确配剂的一定量的燃油喷入进气门（汽油机）。译文及评析译文及评析 The air induction system for the EFI typically consists of a throttle valve, sensors, an air filter, and connec

11、ting ducts.The throttle valve regulates how much air flows into the engine. In turn, it controls engine power output. Like the carburetor throttle valve, it is connected to the gas pedal. When the pedal is depressed, the throttle valve swings open to allow more air to rush into the engine.Sensor 传感器

12、过了一会，小男孩不哭了，睁开眼睛，过了一会，小男孩不哭了，睁开眼睛，用询问的目光看着越南护士。用询问的目光看着越南护士。 空气控制系统主要包括节气门、传感器，空气过滤器，和连接导管。节气门功用是调节进气量，即控制了发动机的输出功率。与化油器节流阀一样，它和油门踏板连接，当踩下油门踏板时，节气门开口增大，进入汽油机气缸的空气量增大。译文及评析译文及评析 The EFI sensor system monitors engine operating conditions and reports this information to the computer. A sensor is an ele

13、ctrical device that changes circuit resistance or voltage with a change in a condition(temperature, pressure, position of parts, etc.).Temperature: 温度温度过了一会，小男孩不哭了，睁开眼睛，过了一会，小男孩不哭了，睁开眼睛，用询问的目光看着越南护士。用询问的目光看着越南护士。 电控喷射系统的传感器系统时刻记录发动机运转状态并将收集的信息反馈到控制器。当发动机所处环境的温度、压力或其他因素变化时，传感器自身状态将发生变化，可以改变电路中电压或电流。译

14、文及评析译文及评析 For example, the resistance of a temperature sensor may decrease as temperature increases. The computer can use the increased current flow through the sensor to calculate any needed change in the injector valve opening. Typical sensors for an EFI system include the followings:(1) Exhaust gas or oxygen sensor.(2) Manifold pressure sensor.(3) Throttle position sensor.(4) Engine temperature sensor.(5) Air flow sensor.(6) Inlet air temperature sensor.(7) Crankshaft position sensor.过了一会，