汽车专业外语058ppt课件.ppt
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1、,Electronic Fuel Injection System 电控燃油喷射系统,Unit 12,EFI has the job of supplying air fuel mixture to the engine. In order to get a cleaner emission, EFI is applied. Three sub systems: air induction system, fuel delivery system, and electronic control system.,Introduction,Components: Air cleaner Air f
2、low meter Throttle valve Air intake chamber Intake manifold runner Intake valve,Air induction system,When the throttle valve is opened, air flow through the air cleaner (ACL), through the air flow meter(AFM), past the throttle valve, and through the intake manifold runner to the intake valve. Air de
3、livered to the engine is a function of drivers demand. As the throttle valve is opened further, more air is allowed to enter the engine cylinders.,http:/ flow meter,Air induction system,It is a device for measuring the volume of air entering the engine. Some use spring-loaded vane while others use a
4、 hot wire or heated filament to sense air flow.,http:/ valve,Air induction system,The valve that regulates how much air enters the engine. The gas pedal in our car is connected to the throttle valve. So actually the gas pedal is a air pedal.,http:/ intake chamber,Air induction system,Prevents pulsat
5、ion of the intake air, and also prevents the interference in each cylinder.,Fuel delivery system,Components: Fuel tank Fuel pump Fuel filter Fuel delivery pipe Fuel injector Fuel pressure regulator Pulsation damper Fuel return pipe,Fuel is delivered from fuel tank to the injector by fuel pump, and t
6、he contaminants are filtered out by fuel filter, and the fuel pressure is maintained at a constant value by fuel pressure regulator. Any fuel is not delivered to the intake manifold by the injector is returned to the tank though a fuel return pipe.,http:/ delivery system,Fuel pump,Normally located i
7、nside the fuel tank. It can deliver more fuel than the engine requires under maximum operating conditions. Electrical fuel pump can eliminate the problem of vapor locking that can be a problem for engines with mechanical fuel pumps.,http:/ delivery system,Fuel filter,To filter / strain any contamina
8、tion / sediment / impurity from getting into the fuel system. Its basic parts are strainer, paper element and support plate.,http:/ delivery system,Injector,An electronically controlled valve. When the injector is energized, an electromagnet moves a plunger that opens the valve, allowing the pressur
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