SFI SYSTEM


  1. CONSTRUCTION


    1. The basic construction of the air fuel ratio sensor and No. 2 air fuel ratio sensor is the same. However, they are divided into the cup type and the planar type, in accordance with the different types of heater construction that are used.

    2. The planar type air fuel ratio sensor uses alumina, which excels in heat conductivity and insulation, to integrate a sensor element with the heater, thus achieving the excellent warm-up performance of the sensor.

      Figure 1. Air Fuel Ratio Sensor

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      *1 Air Fuel Ratio Sensor (Planar Type) *2 Cover
      *3 Alumina *4 Platinum Electrode
      *5 Sensor Element (Zirconia) *6 Heater
      *a Atmosphere *b Coating (Ceramic)

      Figure 2. Output Characteristics of the Air Fuel Ratio Sensor

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    3. The cup type No. 2 air fuel ratio sensor contains a sensor element that surrounds the heater.

      Figure 3. No. 2 Air Fuel Ratio Sensor

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      *1 No. 2 Air Fuel Ratio Sensor (Cup Type) *2 Cover
      *3 Heater *4 Platinum Electrode
      *5 Sensor Element (Zirconia) - -
      *a Atmosphere *b Coating (Ceramic)

      Figure 4. Output Characteristics of the No. 2 Air Fuel Ratio Sensor

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