SFI SYSTEM


  1. CONSTRUCTION


    1. The basic components of the continuously variable valve lift controller assembly are an EDU, a brushless motor, and a differential roller converter.

    2. The internal gears of the continuously variable valve lift controller assembly are lubricated by engine oil.

    3. A neodymium magnet is used in a flat, brushless motor to achieve a compact size. The flat, brushless motor is a DC motor from which the brushes and the commutator have been eliminated. A multipolar magnetized magnet acts as a rotor, which switches the polarity of the voltage applied to the surrounding stator actuation coil in sync with the rotation of the rotor. The resulting alternating field and the rotor magnet magnaflux cause attraction and repulsion to generate torque.

      Tech Tips

      A neodymium magnet is a type of rare earth magnet composed primarily of neodymium, iron, and boron. It has a high magnaflux density to provide an extremely strong magnetism.

    4. The EDU operates the motor in accordance with signals from the ECM. The differential roller converter converts the rotational movement of the motor into a linear movement. This linear movement operates the VALVEMATIC mechanism.

      A01KVT9C02
      *1 Continuously Variable Valve Lift Controller Assembly *2 EDU
      *3 Differential Roller Converter *4 Bearing
      *5 Rotor/Motor *6 Stator
      *a Engine Oil Out *b Engine Oil In
      *c Continuously Variable Valve Lift Controller Assembly Cross Section *d Linear Movement
      *e Rotational Movement *f Motor Portion
      *g

      Sensor Portion


      • Motor Position Sensor

      • Action Angle Sensor

      		 - -

    5. The motor rotates the nut on the differential roller converter. The movement of the nut travels to the planetary unit (gear) and the planetary unit (screw) and causes the sun shaft to move linearly.

      A01KVEFC01
      *1 Differential Roller Converter *2 Planetary Unit (Gear)
      *3 Planetary Unit (Screw) *4 Nut
      *5 Sun Shaft *6 Sun Gear
      *7 Ring Gear *8 Pinion
      *a Linear Movement - -