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Pump driving method and device therefor

  • US 7,588,422 B2
  • Filed: 11/17/2003
  • Issued: 09/15/2009
  • Est. Priority Date: 11/15/2002
  • Status: Active Grant
First Claim
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1. A pump driving method comprising:

  • driving a motor based upon a horse power command value using a discharge pressure-discharge flow characteristic;

    carrying out feedback control of a discharge pressure;

    driving a pump using the motor;

    defining a predetermined value of a set horse power as a characteristic value for a predetermined value of a power voltage, the discharge pressure-discharge flow characteristic being represented by a curved line based on the set horse power on pressure axis and flow axis; and

    changing the curved line with the set horse power that is corresponding to a detected value of the power voltage to change the horse power command value.

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