SFI SYSTEM


  1. FUNCTION


    1. The Variable Valve Timing-intelligent (VVT-i) control is designed to control the exhaust camshaft within a range of 46.5° respectively (of crankshaft angle) to provide valve timing optimally suited to the engine condition. This improves torque in all the speed ranges as well as increasing fuel economy and reducing exhaust emissions.

      B003SQXE03

    2. The following effects can be achieved due to the advanced angle and retarded angle of the intake and exhaust valves.

      B003SG5E05
      *1 Operation Model Diagram: Upon Starting and Idling
      *2 Intake Valve Opening (Intermediate Position)
      *3 Exhaust Valve Opening (Advanced Position)
      *4 Ensuring Starting Ability
      B003SJ3E05
      *1 Operation Model Diagram: At Partial Load
      *2 Exhaust Valve Opening (Retarded Position)
      *3 Intake Valve Opening (Retarded Position)
      *4 Atkinson Cycle
      B003SJ3E05
      *1 Operation Model Diagram: At Partial Load
      *2 Exhaust Valve Opening (Retarded Position)
      *3 Intake Valve Opening (Retarded Position)
      *4 Atkinson Cycle

    3. The ECM cooperatively controls the throttle valve, VVT-iW and VVT-i to achieve a driving condition with optimal fuel economy during normal driving. Also, the ECM controls each actuator in accordance with the driver's intentions during acceleration to achieve a high torque response.