SFI SYSTEM


  1. CONSTRUCTION


    1. A non-contact type accelerator pedal sensor assembly is used. This sensor uses a Hall IC*1, which can retrieve the strength of the magnetic field as an electrical signal, using the Hall effect*2, in which the output voltage can be directly received in accordance with the accelerator pedal depression amount. When the accelerator pedal depression amount changes, the angle of the magnetic field with respect to the direction of the flow of current in the Hall IC changes. As a result, the strength of the potential difference created by the Hall effect varies and is sent to the ECM as an accelerator pedal depression amount signal. Also, in order to ensure reliability, duplicate sensors (main and sub) with differing sensor output characteristics, are used.

      Tech Tips

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

      *2: Phenomenon in which a potential difference is generated perpendicular to the flow of current through a conductor or semiconductor within a magnetic field not parallel to the flow of current.

      Figure 1. Sensor Output Characteristics

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