SFI SYSTEM


  1. FUNCTION


    1. A Direct injection 4-stroke gasoline engine Superior version Sequential multiport Fuel Injection (D-4S SFI) system which has both direct injection type and port injection type is used for the fuel injection system.

    2. The intake air mass is detected by the mass air flow meter sub-assembly to control the fuel injection volume.

    3. Based on signals from each sensor, the ECM controls the injection volume and timing of each type of fuel injector assembly (for direct injection and port injection) in accordance with the engine speed and engine load in order to optimize combustion conditions. Due to this, engine oil dilution reduction, low fuel consumption, and improved emissions as well as high engine output are achieved.

    4. In order to fully maximize the effectiveness of direct injection (cooling effect, jet stream use, air-fuel mixture form variance), a multi-fuel injection system in which the injectors are pulsed multiple times during each injection is used. A D-4S injection control system that maximizes the merits of the port injection and direct injection is used.

    5. During engine start while the idling stop control is operating, direct injection is used. Fuel is directly injected into the cylinder stopped by the compression stage. This allows the engine to start quickly and smoothly.

      Figure 1. Fuel Injector System Activation Ranges

      B007WKEE03

      Figure 2. Fuel Injection Timing

      B007WIBE01
      B007WKXE01

    6. Fuel Cut


      1. When the engine speed exceeds the specified value, fuel injection is stopped to prevent over-revving.

        Engine Speed for Fuel-cut at High Revs
        Engine speed (rpm) 6200 or more