SFI SYSTEM


  1. CONSTRUCTION


    1. A non-contact type throttle position sensor is used. The sensor uses a Hall IC*2, which can retrieve the strength of the magnetic field as an electrical signal using Hall effect*1, in which the output voltage can be directly received in accordance with the throttle valve opening angle. When the throttle valve opening angle changes, the angle of the magnetic field towards the flow of the current in the Hall IC changes. As a result, the strength of the current and vertical magnetic field changes. Due to this, the change in the voltage generated in the vertical direction towards the current and direction of the magnetic field is sent to the ECM as a throttle valve opening angle signal. Also, duplicate sensors (main and sub) with differing sensor output characteristics, are used, ensuring reliability.

      Tech Tips

      *1: Phenomenon in which a potential difference occurs in the electric current and magnetic field in the vertical direction when a magnetic field in the vertical direction is applied and electric current is flowing through a rod or plated conductor or semiconductor.

      *2: An electrical component which uses the electromotive force resulting from the potential difference in the magnetic field.

      Figure 1. Sensor Output Characteristics

      A001N65E07
      *1 Output Voltage
      *2 Fully Open
      *3 Fully Closed
      *4 Throttle Valve Opening Angle