Control Device for Electric Vacuum Pump, and Method for Controlling Electric Vacuum Pump

A control device for an electric vacuum pump that generates a negative pressure, comprising:

• a negative-pressure detector for detecting the negative pressure generated by the electric vacuum pump;
• and
• a pump stop control unit that is configured to stop the electric vacuum pump when the negative pressure detected by the negative-pressure detector is not less than a predetermined value, wherein:
• the pump stop control unit is configured to determine an OFF timing at a present stage of the electric vacuum pump
• based on reference pump-filling-performance data, which is data about a reference negative pressure ratio relative to an elapsed time at an initial stage of the electric vacuum pump, and
• by referring to present pump-filling-performance data, which is data about a present negative pressure ratio relative to an elapsed time at the present stage of the electric vacuum pump.

A method for controlling an electric vacuum pump that generates a negative pressure, comprising the steps of:

• a negative-pressure detection step of detecting the negative pressure generated by the electric vacuum pump;
• and
• a pump stop control step of stopping the electric vacuum pump when the negative pressure detected by a negative-pressure detector is not less than a predetermined value, wherein
• the pump stop control step is adapted to determine an OFF timing at a present stage of the electric vacuum pump
• based on reference pump-filling-performance data, which is data about a reference negative pressure ratio relative to an elapsed time at an initial stage of the electric vacuum pump, and
• by referring to present pump-filling-performance data, which is data about a present negative pressure ratio relative to an elapsed time at the present stage of the electric vacuum pump.