汽车专业英语﹝第三章﹞《汽车专业英语》王锦俞主编.ppt

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 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 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 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 volume 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