СИСТЕМА ECD


  1. CONSTRUCTION


    1. Except Destination Package for Turkey Sedan Models


      1. The intake mass air flow meter sub-assembly, which is a slot-in type, allows a portion of the intake air to flow through the detection area.

      2. This intake mass air flow meter sub-assembly has built-in intake air temperature sensors.

      3. Intake air flows past the temperature sensor (before heater), the heater, and then the temperature sensor (after heater) of the silicon chip sensor in the by-pass duct. As the intake air is warmed up when it is exposed to the heater, the temperature of the intake air as it flows past the temperature sensor (after heater) is higher than when it flows past the temperature sensor (before heater). The difference in temperature of the intake air at each temperature sensor varies depending on the velocity of the intake air that flows past the silicon chip sensor. The temperature sensor bridge circuit detects the difference in temperature and the control circuit converts it into a pulse signal and outputs it to the ECM. When the temperature detected by the temperature sensor (before heater) is higher than that detected by the temperature sensor (after heater), backflow of the intake air is detected.

      4. The ECM calculates the intake air volume based on the pulse signal received from the intake mass air flow meter sub-assembly, and uses it to determine the fuel injection duration necessary for an optimal air-fuel ratio.

      5. The heater control bridge circuit has a temperature sensor and power transistor, and maintains the heater temperature at a specific temperature.

        A01KVNHC01
        *1 Temperature Sensor (before Heater) *2 Temperature Sensor (after Heater)
        *3 Heater *4 Silicon Chip Sensor
        *a Air Flow - -

    2. Destination Package for Turkey Sedan Models


      1. The intake mass air flow meter sub-assembly of diesel engine uses precise fuel injection volume control and EGR control to realize clean emission.

      2. This intake mass air flow meter sub-assembly, which is a slot-in type, allows a portion of the intake air to flow through the detection area. By directly measuring the mass and the flow rate of the intake air, the detection precision is improved and the intake air resistance is reduced.

      3. The intake mass air flow meter sub-assembly has a built-in atmospheric temperature sensor.

      4. In the intake mass air flow meter sub-assembly, the output voltage is converted into an output frequency by a frequency conversion circuit and is transmitted to the ECM. By converting the intake mass air flow meter sub-assembly output into frequency (frequency range between 250 to 11000 Hz), a more accurate intake air amount value can be gained because the value is then less likely to be affected by the differences between resistance of the individual circuits including the wire harnesses.

        A01KVMYC01
        *1 Hot Wire Element *2 Cold Wire Element
        *3 Atmospheric Temperature Sensor - -
        *a Air Flow - -