| US 7,588,422 B2 | ||
| Pump driving method and device therefor | ||
| Yoshiyuki Ochi, Settu (Japan); Tetsuo Nakata, Kusatsu (Japan); and Yasuto Yanagida, Kusatsu (Japan) | ||
| Assigned to Daikin Industries, Ltd., Osaka (Japan) | ||
| Appl. No. 10/534,690 PCT Filed Nov. 17, 2003, PCT No. PCT/JP03/14613 § 371(c)(1), (2), (4) Date Oct. 12, 2005, PCT Pub. No. WO2004/046552, PCT Pub. Date Jun. 03, 2004. |
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| Claims priority of application No. 2002-331569 (JP), filed on Nov. 15, 2002. | ||
| Prior Publication US 2006/0153689 A1, Jul. 13, 2006 | ||
| Int. Cl. F04B 49/06 (2006.01) | ||
| U.S. Cl. 417—44.11 [417/44.2; 417/12] | 10 Claims |
| 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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