SERVO PUMP CONTROL SYSTEM AND METHOD

• US 20170268499A1
• Filed: 06/27/2014
• Published: 09/21/2017
• Est. Priority Date: 06/28/2013
• Status: Active Grant

• Current Assignee: Danfoss A/S
• Original Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Inventors: CHEN, Yilun, CHENG, Xiaomeng
• Granted Patent: US 10,458,403 B2
• Time in Patent Office: Days
• CPC Class Codes: F04B 17/03 driven by electric motors
• CPC Class Codes: F04B 19/22 of reciprocating-piston type
• CPC Class Codes: F04B 49/06 Control using electricity regulating by means of floats actuating electric switches F04B49/04
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04B 51/00 Testing machines, pumps, or pumping installations

Abstract

A servo pump control system (100) and a corresponding servo pump control method are disclosed. The servo pump control system (100) comprises a pressure controller (101) configured to receive a first control signal, and directly or indirectly provide a second control signal to the electric motor; and the pressure controller (101) configured to automatically commission at least one parameter without any manual adjustment.

Claims

1. A servo pump control system, comprising:

a pressure controller configured to receive a first control signal, and directly or indirectly provide a second control signal to the electric motor; and

the pressure controller further configured to automatically commission at least one parameter without any manual adjustment.

2. The servo pump control system according to claim 1, wherein the automatically commissioning at least one parameter comprises automatically commissioning at least one parameter based on a received elastic modulus of the physical model.

3. The servo pump control system according to claim 2, further comprising:

a speed controller configured to receive a constant speed command, and directly or indirectly provide a third control signal to the electric motor so that the electric motor rotates with a constant speed; and

an elastic modulus identification module configured to identify the elastic modulus based on the rotation speed of the electric motor and the output pressure of the pump.

4. The servo pump control system according to claim 3, wherein the elastic modulus identification module is further configured to calculate the elastic modulus according to the following equation:

5. The servo pump control system according to claim 3 or 4, wherein the rotation speed of the electric motor comes from a speed sensor or a speed command, and the output pressure of the pump comes from a pressure sensor.

6. The servo pump control system according to claim 3 or 4, wherein the rotation speed of the electric motor and the output pressure of the pump are respectively the rotation speed of the electric motor and the output pressure of the pump when the pump works in a stable condition, in which the first derivative of the output pressure of the pump has a linear relation with the rotation speed of the electric motor.

7. The servo pump control system according to claim 2, wherein the automatically commissioning at least one parameter based on a received elastic modulus of the physical model comprises automatically commissioning the parameters of a PID controller based on a received elastic modulus of the physical model.

8. A servo pump control method, comprising:

receiving a first control signal and directly or indirectly providing a second control signal to the electric motor by a pressure controller; and

automatically commissioning at least one parameter by the pressure controller without any manual adjustment.

9. The servo pump control method according to claim 8, wherein the automatically commissioning at least one parameter comprises automatically commissioning at least one parameter based on a received elastic modulus of the physical model.

10. The servo pump control method according to claim 9, further comprising:

receiving a constant speed command and directly or indirectly providing a third control signal to the electric motor by a speed controller so that the electric motor rotates with a constant speed; and

identifying the elastic modulus based on the rotation speed of the electric motor and the output pressure of the pump.

11. The servo pump control method according to claim 10, wherein the identifying the elastic modulus comprises calculating the elastic modulus according to the following equation:

12. The servo pump control method according to claim 10 or 11, wherein the rotation speed of the electric motor comes from a speed sensor or a speed command, and the output pressure of the pump comes from a pressure sensor.

13. The servo pump control method according to claim 10 or 11, wherein the rotation speed of the electric motor and the output pressure of the pump are respectively the rotation speed of the electric motor and the output pressure of the pump when the pump works in a stable condition, in which the first derivative of the output pressure of the pump has a linear relation with the rotation speed of the electric motor.

14. The servo pump control system according to claim 9, wherein the automatically commissioning at least one parameter based on a received elastic modulus of the physical model comprises automatically commissioning the parameters of a PID controller based on a received elastic modulus of the physical model.