汽车电控系统原理与检修1-概述.ppt

1、Electronic Fuel Injection Overview,燃油供给系统,电控燃油喷射概述,进气系统,电控系统,The Electronic Fuel Injection system can be divided into three basic sub-systems : the fuel delivery system, air induction system, and the electronic control system.,电控燃油喷射系统可分为三个基本子系统；燃油供给系统，进气系统和电控系统。,The Fuel Delivery System,燃油分配系统,喷油器,

2、燃油压力调节器,回油管,供油管,燃油滤清器,燃油箱,燃油泵,The fuel delivery system consists of the fuel tank, fuel pump, fuel filter, fuel delivery pipe (fuel rail), fuel injector, fuel pressure regulator, and fuel return pipe. Fuel is delivered from the tank to the injector by means of an electric fuel pump. The pump is typic

3、ally located in or near the fuel tank. Contaminants are filtered out by a high capacity in line fuel filter. Fuel is maintained at a constant pressure by means of a fuel pressure regulator. Any fuel which is not delivered to the intake manifold by the injector is returned to the tank through a fuel

4、return pipe.,1.燃油供给系统包括燃油箱、燃油泵、燃油滤清器、供油管、喷油器、燃油压力调节器和回油管。 2.燃油被电动燃油泵从燃油箱输送到喷油器，典型的燃油泵被固定在燃油箱里面或其附近。杂质由燃油管上串接的高容量滤清器过滤。 3.燃油压力调节器将燃油维持在恒定压力，没有被喷油器喷射到进气歧管的燃油将通过回油管返回到燃油箱。,The Air Induction System,进气系统,空气滤清器,空气流量计,节气门,进气室,进气门,进气歧管,The air induction system consists of the air cleaner, air flow meter, th

5、rottle valve, air intake chamber, intake manifold runner, and intake valve. When the throttle valve is opened, air flows through the air cleaner, through the air flow meter (on L type systems), past the throttle valve, and through a well tuned intake manifold runner to the intake valve. Air delivere

6、d to the engine is a function of driver demand. As the throttle valve is opened further, more air is allowed to enter the engine cylinders.,1.进气系统包括空气滤清器、空气流量计、节气门、进气室、进气歧管和进气门。 2.当节气门被打开，空气流经空气滤清器、空气流量计（L型）、节气门和一个完好设计的进气歧管最后到达进气门。 3.按照驾驶员的要求空气被输送到发动机，当节气门进一步开大时，更多的空气将被允许进入发动机气缸。,Electronic Control

7、System,电 控 系 统,喷油器,喷油器激发器,节气门角度,冷却剂温度,空气流量,废气中氧含量,发动机转速,信号输入传感器,The electronic control system consists of various engine sensors,Electronic Control Unit (ECU), fuel injector assemblies, and related wiring. The ECU determines precisely how much fuel needs to be delivered by the injector by monitoring

8、 the engine sensors. The ECU turns the injectors on for a precise amount of time, referred to as injection pulse width or injection duration, to deliver the proper air/fuel ratio to the engine.,1.电控系统包括各种不同的发动机传感器、电控单元、喷油器组件和连接导线。 2. 通过监控发动机传感器，电脑精确地按需确定喷油器喷油量的多少。 3.电脑将喷油器在一个精确的时间量保持开启，即所谓喷油脉宽或喷油持续时

9、间，以提供给发动机恰当的空燃比。,Basic System Operation,基本系统操作,空气流量计,点火线圈,冷却温度传感器,节气门位置传感器,氧传感器,电控单元,喷油器,Advantages of EFI,电控燃油喷射的优点,传感器,执行器,空气流量计,分电器,转速信号/曲轴转角信号,水温传感器,进气温度传感器,节气门位置传感器,怠速信号 节气门位置信号,点火开关,启动信号,车速传感器,刹车灯开关,空调开关,氧传感器,电源,喷油器组,点火器,空挡启动开关,点火线圈,分电器,前大灯,火花塞,雾灯,控制阀,真空开关阀,其它发动机系统,自诊断指示灯（诊断数据显示）,EFI/TCCS System,电控喷射系统,空气流量计,怠速控制阀,废气再循环阀,喷油器,喷油器激发器,分电器,Ignition Spark Management (ESA) Exhaust Gas Recirculation (EGR) Idle Speed Control (ISC) Self Diagnosis System Other Engine Related Systems Electronically Controlled Transmission (ECT) Variable Inducti