Flow control for fluid handling system
View Patent ↗A method of correcting fluid flow offset for an uncharacterized fluid handling system including a motor. The method includes running the motor at a reference fluid flow demand using generic coefficients, and changing fluid flow demand from the reference fluid flow demand until the motor signals a power limit condition. When the motor signals the power limit condition, the fluid flow demand is noted. The operational fluid flow demands are scaled by a ratio of the noted fluid flow demand to the reference fluid flow demand.
1. A method of correcting fluid flow offset for an uncharacterized fluid handling system including a motor, said method comprising:
running the motor at a reference fluid flow demand using generic coefficients;
changing fluid flow demand from the reference fluid flow demand until the motor signals a power limit condition;
noting the fluid flow demand when the motor signals the power limit condition; and
scaling operational fluid flow demands to the noted fluid flow demand.
2. A method as set forth in claim 1 wherein said generic coefficients are determined from test data.
3. A method as set forth in claim 2 wherein said generic coefficients are determined by regression analysis of the test data.
4. A method as set forth in claim 1 wherein said generic coefficients consist of K1, K2, K3 and K4 used in a torque demand equation having the form T=K1+K2*s+K3*A+K4*s*A 2 , where T represents the torque demand in Newton meters, s represents motor speed in revolutions per minute and A represents the fluid flow demand in cubic feet per minute.
5. A method as set forth in claim 1 wherein said method is performed by the motor on first start up.
6. A method as set forth in claim 1 wherein said method is performed by the motor during a test mode.
7. A method as set forth in claim 1 wherein the uncharacterized fluid handing system for which the method is performed comprises a blower.
8. A method as set forth in claim 1 wherein the uncharacterized fluid handing system for which the method is performed comprises a pump.
9. A method of correcting fluid flow offset for an uncharacterized fluid handling system including a motor, said method comprising:
running the motor at a reference fluid flow demand using generic coefficients;
measuring actual fluid flow; and
scaling operational fluid flow demands by a ratio of the measured fluid flow to the reference fluid flow demand.
10. A method as set forth in claim 9 wherein said generic coefficients are determined from test data.
11. A method as set forth in claim 10 wherein said generic coefficients are determined by regression analysis of the test data.
12. A method as set forth in claim 9 wherein said generic coefficients consist of K1, K2, K3 and K4 used in a torque demand equation having the form T=K1+K2*s+K3*A+K4*s*A 2 , where T represents the torque demand in Newton meters, s represents motor speed in revolutions per minute and A represents the fluid flow demand in cubic feet per minute.
13. A method as set forth in claim 9 wherein said method is performed by the motor on first start up.
14. A method as set forth in claim 9 wherein said method is performed the motor during a test mode.
15. A method as set forth in claim 9 wherein the uncharacterized fluid handing system for which the method is performed comprises a blower.
16. A method as set forth in claim 9 wherein the uncharacterized fluid handing system for which the method is performed comprises a pump.