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1、汽车专业英语,Unit 3 Electronic Fuel Injection 第三单元 电控燃油喷射（EFI）,3-1 Electronic Fuel Injection Description 电控燃油喷射介绍,1- sensor 传感器 1.1- air flow meter sensor 空气流量计 1.2- water temperature sensor 水温传感器 engine coolant temperature sensor 发动机冷却液温度传感器 1.3- oxygen sensor 氧传感器 1.4- crankshaft position sensor 曲轴位置传感器
2、 engine speed sensor 发动机转速传感器 2.1- ECU=electronic control unit 电控单元 3- actuator 执行器 3.1- injector 喷油器 3.2- ignition coil with igniter 带点火器的点火线圈 COP= coil on-plug 装在火花塞上的点火线圈 4- wiring harness 线束,The EFI system uses various sensors to detect the operating conditions of the engine and the vehicle. In
3、accordance with the signals from these sensors, the ECU calculates the optimal fuel injection volume and operates the injectors in order to inject the proper volume of fuel. During ordinary driving, the engine ECU determines the fuel injection volume for achieving the theoretical air-fuel ratio, in
4、order to ensure the proper power, fuel consumption, and exhaust emission levels simultaneously.,At other times, such as during warm-up, acceleration, deceleration, or high-load driving conditions, the engine ECU detect those conditions with the various sensors and then corrects the fuel injection vo
5、lume in order to ensure an optimal air-fuel mixture at all times.,3-2 Types of EFI 电控燃油喷射的类型,L-EFI- 空气流量控制型电控燃油喷射，带空气流量计的电控燃油喷射,D-EFI- 歧管压力控制型电控燃油喷射，压力测量式的电控燃油喷射,1- oxygen sensor 氧传感器 2- spark plug 火花塞 3- injector 喷油器 4- pressure regulator 压力调节器 5. 1- AFM#1 空气流量计 5.2- MAP#2 进气歧管压力传感器 5.3- IAT sensor
6、 =intake air temperature sensor 进气温度传感器 6- fresh air 新鲜空气 7- bypass tract 旁通气道 8- ISCV=idle speed control valve 怠速控制阀 9- TPS=throttle position sensor 节气门位置传感器 10- water temperature sensor 水温传感器,Types of EFI,There are two types of EFI system classified by the amount of the intake air detection method
7、. 1. L-EFI (Air-flow control type) This type uses an air flow meter to detect the amount of the air flowing in the intake manifold. There are two types of detection methods: One directly measures the intake air mass, and one makes corrections based on the air volume.,2. D-EFI (Manifold pressure cont
8、rol type) This type measures the pressure in the intake manifold to detect the amount of the intake air using the intake air density.,3-3 Fuel System Description 供油系统介绍,Standard System Type Returnless Fuel System Type 标准系统型 无回油系统型,1- fuel tank 燃油箱 2- fuel pump 燃油泵，汽油泵 3- fuel filter 汽油滤清器 4- pressur
9、e line, pressure pipe 压力油管 5- fuel pressure regulator 燃油压力调节器 6- injector 喷油器 7- fuel rail 油轨 ，delivery pipe 供油管 8- fuel return line或 return pipe 回油管 9- fuel rail(no return flow) 燃油轨(无回油流动),Fuel Pump in Fuel Tank 燃油箱内装式燃油泵,10- fuel filter 燃油滤清器 11- float 浮子 12- fuel gauge sensor或 fuel level sensor 燃
10、油表传感器 13- coupler 联接器 14- return tube 回油管 15- fuel deliver tube 供油管 16- fuel damper ( pulsator ) 燃油脉动衰减器 17- foam rubber sleeve 泡沫橡胶套 18- rubber isolator 橡胶隔离物 19- suction-jet pump 吸射泵 20- suction strainer 吸入滤网,The Basic Fuel System Configuration,Fuel Pump The pump impeller is turned by the motor to
11、 compress the fuel. The check valve closes when the fuel pump is stopped to maintain the pressure in the fuel line and make it easier to restart the engine. The relief valve opens when the pressure on the outlet side becomes too high in order to prevent the fuel pressure from becoming too high。 Fuel
12、 filter The fuel filter removes dirt and impurities from the fuel that is compressed by the fuel pump.,Injector The injector injects fuel into the intake ports of the cylinders in accordance with the signal from the engine ECU. The signals from the engine ECU cause current to flow in the solenoid co
13、il, and this causes the plunger to be pulled, opening the valve to inject the fuel. Because the plunger stroke does not change, the amount of the fuel injection is controlled at the time that the current is flowed to the solenoid. Pressure Regulator The pressure regulator controls the fuel pressure
14、to the injector at 324 kPa (3.3 kgf/cm2). (Values may differ depending on engine models),3-4 Electronic Spark Advance System 电子点火系统,EI with distributor 带分电器的电子点火 (DI=distributor ignition),EI without distributor 不带分电器的电子点火 (DLI=distributorless ignition),1.1- ignition coil with ignition driver 带点火驱动器的点火线圈 1.2- ignition coil with igniter 带点火器的点火线圈 2.1- ignition distributor 分电器 2.2- high-voltage distri
