POWER BACK DOOR SYSTEM


  1. CONSTRUCTION


    1. The back door motor is composed of the motor itself, a magnetic clutch, a pulse sensor, etc.

    2. The magnet clutch turns on and off to switch between manual and automatic opening and closing.

    3. The pulse sensor detects the position of 64 polar magnets set on the outer circumference of the magnetic clutch as a pulse signal. The power back door ECU receives this signal and detects the opening and closing speed, position and opening and closing direction of the back door.

    4. During an open operation, the power back door ECU performs speed reduction control based on the pulse sensor signal approximately 200 mm before the door reaches the fully open position in order to reduce the shock of the door being fully opened.

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      *1 Back Door Motor Unit - -

  2. OPERATION


    1. Back Door Speed (Jam) Detection Methods


      1. The power back door ECU detects the movement speed and changes in the movement speed of the back door by detecting changes in the speed of the motor from the pulse intervals output by pulse sensor A.

      2. When a foreign object becomes jammed or the back door becomes overloaded during an open or close operation performed by the power back door system, the power back door ECU detects a jam (overload) based on changes in the pulse widths output from sensor A and reverses the operation of the back door motor.

      3. Overload detection is corrected at fixed intervals according to changes in motor speed (back door movement speed).

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        *1 Signal frome Pulse Sensor A
        *2 Back Door Movement Speed
        *3 Normal
        *4 Overlod

    2. Back Door Position Detection Methods


      1. The power back door ECU counts 1-cycle pulses output from pulse sensor A in order to detect the movement amount of the back door.

      2. Varying hi and low periods of the pulse signal are detected depending on the rotational direction of the motor output by pulse sensor B according to the movement amount of the back door. This allows the movement direction of the back door to be detected, and by storing these values the current position of the back door can be recognized.

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