FUEL SYSTEM


  1. CONSTRUCTION


    1. Slit-nozzle type injectors, which have slit-shaped injection orifices, are used as direct fuel injector assemblies.

    2. Each direct fuel injector assembly, based on signals from the ECM, meters the flow of high-pressure fuel. The fuel is injected as a fine-atomized mist in a fan shaped pattern, directly into the combustion chamber, via a slit type nozzle.

    3. An insulator is used in the area in which the injector comes in contact with the cylinder head sub-assembly, and a Teflon shaft seal is used to seal the injector against the combustion pressure in the cylinders. This reduces vibration and noise and enhances sealing performance.

    4. Each nozzle tip is coated to reduce the adhesion of deposits.

    5. The direct fuel injector assemblies are actuated by the injector drivers (EDUs). Based on signals received from the ECM, the injector drivers (EDUs) apply an initial high voltage of 40 V and an approximate current of 8.9 A to the injectors in order to open the needle valves quickly. Once the direct fuel injector assemblies are open, the injector drivers (EDUs) apply a constant voltage of 14 V and an approximate current of 2.5 A, in order to maintain the open state efficiently. This control allows the direct fuel injector assemblies to inject high-pressure fuel in a short amount of time.

      A004DMZC01
      *1 Needle Valve *2 Teflon Shaft Seal
      *a Direct Fuel Injector Assembly Cross Section *b View from Bottom Side