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1、复习,提问（教师说发动机配气机构汉语部件名称，同学回答英文名称） 翻译VVT英文片段,学习内容,本次课学习内容、目标和重点难点,学习目标,难点重点,EFI systems GDI,1.掌握EFI的原理、主要组成系统部件的英文名称；掌握EFI的分类英文术语 2.掌握GDI系统的控制原理和控制模式,1.重点为记忆英文专业术语、GDI控制原理 2.难点需要记忆的生词偏多 3.汉译准确表达也是难点,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,2.6.1 New Words and
2、Phrases,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,1. Types of Pulse Fuel Injection Systems In the electronic fuel injection system, the injector may be opened and closed by ele
3、ctrical signals. This is a pulse fuel injection system. The pulse injection system is usually electronically controlled. Although there are a number of design differences between various pulse fuel injection systems, the operating principles are very similar. The throttle body injection system (Fig.
4、2-9 left) uses an assembly containing one or two fuel injectors. The assembly is mounted at the entrance to the intake manifold and injects fuel ahead of the throttle valve. These systems are also called single-point injection（SPI）or central fuel injection. Multi-point injection systems (Fig.2-9 rig
5、ht), also called multi-port injection（MPI）systems, deliver fuel at the engine intake ports near the intake valves.,2.6.2 Text,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,2. Pulse Fuel Injection System Components The typical pulse injection system (Fig.2-10) can
6、 be broken into three subsystems: Air induction system. The system consists of an air cleaner assembly, throttle body, and intake manifold (Fig.2-10). The throttle body section contains the throttle valve, which is opened and closed by the driver to control the amount of air entering the intake mani
7、fold. Fuel delivery system. The fuel delivery system (Fig.2-10）provides the fuel which mixes with the air. The main parts of the system are shown in Fig.2-11 and Fig.2-12. Pressure is provided by an electric fuel pump.,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection Syste
8、m,Fig.2-9 Single-point injection (left) and multi-point injection system (right),Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,Fig.2-10 A typical pulse injection system,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,Fig.2-11 Fu
9、el delivery system,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,Fig.2-12 Fuel delivery system of a car,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,Fig.2-12 Fuel delivery system of a car,Chapter 2 Internal Combustion Engine
10、2.6 Gasoline Electronic Fuel Injection System,Electronic control system. The computer receives signals from a number of sensors whenever the engine is running (Fig.2-13). From this input, the computer evaluates engine fuel needs and adjusts injector pulse width accordingly. Modern computers control
11、many other engine systems in addition to the fuel injectors（Fig.2-10）. The sensors monitor various engine functions and feed this information to the computer. The number and types of sensors vary with the system.,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,Fig.
12、2-13 Engine electronic control system,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Injection System,The oxygen sensor monitors the amount of oxygen in the engines exhaust gases. The computer uses signals from the oxygen sensor to control the air-fuel mixture. The oxygen sensor i
13、s generally mounted in the exhaust manifold. The engine speed sensor monitors engine RPM. Many speed sensors are mounted in the distributor. In other systems, the speed sensor is mounted so that it can monitor crankshaft or camshaft rotation. These speed sensors also indicate the crankshaft and cams
14、haft position so that the computer can open the injector before the intake valve opens. Throttle position is relayed to the computer by the throttle position sensor. Throttle position sensors are installed on the throttle body.,Chapter 2 Internal Combustion Engine 2.6 Gasoline Electronic Fuel Inject
15、ion System,Engine load is transmitted to the computer by means of an intake manifold absolute pressure sensor. The sensor converts manifold vacuum into a small electrical signal. This input allows the computer to increase fuel supply when the engine is under load and needs a richer mixture, and decr
16、ease fuel supply when engine load is light. Every injection system has a temperature sensor to measure engine coolant temperature. Many injection systems have an additional sensor to measure the temperature of the incoming air. Some late model fuel injection systems monitor the amount of air entering the engine by using an airflow sensor（Fig.2-10）. The computer takes this input and compares it with engine RPM and manifold vacuum to determine the amount of
