STOP AND START


  1. CONSTRUCTION


    1. The electric oil pump for AT is provided for the stop and start system and is controlled by the engine stop and start ECU.

    2. The electric oil pump for AT enables a stable Automatic Transmission Fluid (ATF) supply during idle stop, and delivers good responsiveness and smoothness at the time of start off.

    3. The electric oil pump for AT only operates when the engine is in the idle stop status. While the engine is operating, ATF is supplied from the oil pump assembly.

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      *1 Electric Oil Pump for AT - -

    4. The electric oil pump for AT consists of an oil pump motor driver section, DC sensorless and brushless motor section, and oil pump section.

    5. The oil pump motor driver controls the electric oil pump for AT according to the signals from the engine stop and start ECU.

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      *1 Pump Rotor *2 Magnet
      *3 Stator Core *4 Oil Pump Motor Driver
      *5 Shaft - -
      *a Oil Pump Section *b DC Sensorless and Brushless Motor Section
      *c Oil Pump Motor Driver Section - -

  2. OPERATION


    1. The oil pump assembly generates oil pressure using the engine power. At this time, the fluid pressure generated by the electric oil pump for AT is cut off by the check valve provided at the electric oil pump for AT discharge part and the electric oil pump for AT does not operate.

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    2. During idle stop, the regular oil pump assembly operation stops. At this time, the electric oil pump for AT operates to generate fluid pressure, open the check valve and supply ATF to the AT valve body.

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    3. When the engine restarts, both the fluid pressure generated by the electric oil pump for AT and the fluid pressure generated by the oil pump assembly are applied to the AT valve body. At this time, if the fluid pressure generated by the oil pump assembly becomes higher than the fluid pressure generated by the electric oil pump for AT, the check valve will close and the fluid pressure generated by the electric oil pump for AT will not be applied. Operation of the electric oil pump for AT is stopped according to the engine speed and other signals.

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