专业外语(12).ppt

Electronic Fuel Injection Electronic Fuel Injection SystemSystem电控燃油喷射系统电控燃油喷射系统Unit 12Unit 12?? EFI has the job of supplying air fuel mixture to the EFI has the job of supplying air fuel mixture to the .?? In order to get a cleaner emission, EFI is applied. In order to get a cleaner emission, EFI is applied.?? Three sub systems: Three sub systems: air induction system, air induction system,fuel delivery fuel delivery systemsystem, and , and electronic control systemelectronic control system..IntroductionIntroduction1??ponents:??Air cleanerAir cleaner??Air flow meterAir flow meter??Throttle valveThrottle valve??Air intake chamberAir intake chamber??Intake manifold runnerIntake manifold runner??Intake valveIntake valveAir induction systemAir induction system??When the throttle valve is opened, air flow through the air When the throttle valve is opened, air flow through the air cleaner (ACL), through the air flow meter(AFM), past the throttle cleaner (ACL), through the air flow meter(AFM), past the throttle valve, and through the intake manifold runner to the intake , and through the intake manifold runner to the intake valve.??Air delivered to the engine is a function of driverAir delivered to the engine is a function of driver’’s demand. As s demand. As the throttle valve is opened further, more air is allowed to enter the the throttle valve is opened further, more air is allowed to enter the engine -camaro-hennessey-polished-air-induction-system2??Air flow meterAir flow meterAir induction systemAir induction system??It is a device for measuring the volume of air entering It is a device for measuring the volume of air entering the engine.??Some use Some use spring-loaded vane spring-loaded vane while others use a while others use a hot hot wire or heated filament wire or heated filament to sense air sense air -??Throttle valveThrottle valveAir induction syst