No flow detection means for sensorless pumping control applications

• US 10,317,894 B2
• Filed: 02/16/2016
• Issued: 06/11/2019
• Est. Priority Date: 02/13/2015
• Status: Active Grant

• Current Assignee: Fluid Handling LLC (Xylem, Inc.)
• Original Assignee: Fluid Handling LLC (Xylem, Inc.)
• Inventors: Cheng, Andrew A., Gu, James J.
• Primary Examiner(s): Dunn, Darrin D
• Application Number:
  US15/044,670
• Publication Number:
  US 20160246290A1
• Time in Patent Office: 1,211 Days
• CPC Class Codes: F04D 15/0209 responsive to a condition of the working fluid F04D15/029 takes precedence
• CPC Class Codes: F04D 15/0245 responsive to a condition of the pump
• CPC Class Codes: G05B 19/46 hydraulic

Abstract

Apparatus is provided featuring a signal processor or processing module configured to receive signaling containing information about a pump no flow idle (NFI) state when the pump is running at a pump idle speed; and determine corresponding signaling containing information about whether the pump should remain in a no flow shutdown (NFSD) state or the pump NFI state, based upon the signaling received. The signal processor or processing module is configured to provide the corresponding signaling containing information about whether the pump should remain in the NFSD state or the NFI state.

Claims

1. Apparatus comprising:

a signal processor or processing module configured at least to;

receive signaling containing information about a pump no flow idle (NFI) state when the pump is running at a pump idle speed;

determine corresponding signaling containing information about whether the pump should remain in a no flow shutdown (NFSD) state or the NFI state, based upon the signaling received; and

provide control signaling to turn the pump OFF, based upon the corresponding signaling determined;

wherein the signal processor or processing module is configured to determine the corresponding signaling by taking a system flow Q* at a pump idle speed n_idle as a no flow detection primary parameter under a no flow condition, using an equation;

0≤

Q*≤

Q_thr,t≥

T_p 

 

(3.1),

where a flow threshold is defined as Q_thr for a period of prove time of T_P; and

wherein the signal processor or processing module is configured to determine if the system flow Q* requested at the pump idle speed is less than the flow threshold Q_thr for the period of prove time of T_p, and determine that if an NFSD condition is met and control may remain in the NFSD state or the NFI state, by following NFSD/NSI schemes and a NFSD flag remains raised;

or otherwise, turn the pump back to its normal operation if flow is detected in system, based upon the Equation;

Q_thr≤

Q* with t≥

T_p.

2. Apparatus according to claim 1, wherein the apparatus comprises the pump.

3. Apparatus according to claim 1, wherein the apparatus comprises one or more memory modules configured to store the signaling containing information about the pump no flow idle (NFI) state when the pump is running at the pump idle speed, and provide the signaling to the signal processor or processing module.

4. Apparatus comprising:

a signal processor or processing module configured at least to;

receive signaling containing information about a pump no flow idle (NFI) state when the pump is running at a pump idle speed; and

determine corresponding signaling containing information about whether the pump should remain in a no flow shutdown (NFSD) state or the NFI state, based upon the signaling received; and

provide control signaling to turn the pump OFF, based upon the corresponding signaling determined;

wherein the signal processor or processing module is configured to determine the corresponding signaling by taking system pressure P* at a pump idle speed n_idle as a no flow detection parameter under the no flow condition, using an Equation;

(H₀−

db)≤

P*≤

H₀,t≥

T_p 

 

(3.2),

where H₀ is the idle pressure, (H₀−

db) is a pressure drop from the idle pressure, and T_P, is the period of prove time; and

wherein the signal processor or processing module is configured to determine if the system pressure P* at the idle speed is less than the idle pressure H₀ and greater than the pressure drop (H₀−

db) from the idle pressure for the period of prove time of T_P, and determine if an NFSD condition is met and control may remain in the NFSD state or the NFI state, by following NFSD/NSI schemes and an NFSD flag remain raised;

or otherwise, turn pump back to its normal operation if flow is detected in system under the flow condition, based upon the Equation;

P*≤

(H₀−

db) with t≥

T_p.

5. Apparatus comprising:

a signal processor or processing module configured at least to;

receive signaling containing information about a pump no flow idle (NFI) state when the pump is running at a pump idle speed; and

determine corresponding signaling containing information about whether the pump should remain in a no flow shutdown (NFSD) state or the NFI state, based upon the signaling received; and

provide control signaling to turn the pump OFF, based upon the corresponding signaling determined;

wherein the signal processor or processing module is configured to determine the corresponding signaling by taking an instant system coefficient C_V at the pump idle speed of n_idle as a no flow detection parameter as well under the no flow condition, using an Equation;

0≤

C*_v≤

C_v-thr,t≥

T_P 

 

(3.3),

where C_v-thr is a system coefficient threshold, and T_P a period of prove time; and

wherein the signal processor or processing module is configured to determine if the instant system coefficient C_V at the minimum speed is vanished or less than the system coefficient threshold of C_v-thr for the period of prove time of T_P, and determine if an NFSD condition is met and an NFSD flag is then raised accordingly;

or otherwise, turn the pump back to its normal operation if flow is detected in system under the flow condition, using an Equation;

C_v-thr≤

C*_V with t≥

T_p.

6. Apparatus comprising:

a signal processor or processing module configured at least to;

receive signaling containing information about a pump no flow idle (NFI) state when the pump is running at a pump idle speed; and

determine corresponding signaling containing information about whether the pump should remain in a no flow shutdown (NFSD) state or the NFI state, based upon the signaling received; and

provide control signaling to turn the pump OFF, based upon the corresponding signaling determined;

wherein the signal processor or processing module is configured to determine the corresponding signaling by taking motor power w* at the pump idle speed of n_idle as a no flow detection parameter as well under the no flow condition, using an Equation;

0≤

w*≤

w_thr,t≥

T_p 

 

(3.4),

where w* is the motor power, w_thr is a power threshold of w_thr, and T_P is a period of prove time; and

wherein the signal processor or processing module is configured to determine if the motor power w* at the idle speed is less than the power threshold w_thr for the period of prove time T_P, and determine if an NFSD condition is met and a NFSD flag is then raised accordingly;

or otherwise, turn pump back to its normal operation if flow is detected in system under the flow condition, based upon an Equation;

w_thr≤

w* with t≥

T_p.

7. A method comprising:

receiving with a signal processor or processing module signaling containing information about a pump no flow idle state (NFI) when the pump is running at a pump idle speed;

determining with the signal processor or processing module corresponding signaling containing information about whether the pump should remain in a no flow shutdown (NFSD) state or the NFI state, based upon the signaling received; and

providing control signaling to turn the pump OFF, based upon the corresponding signaling determined;

wherein the method comprises configuring the signal processor or processing module to determine the corresponding signaling by taking a system flow Q* at a pump idle speed n_idle as a no flow detection primary parameter under a no flow condition, using an equation;

0≤

Q*≤

Q_thr,t≥

T_p 

 

(3.1),

where a flow threshold is defined as Q_thr for a period of prove time of T_P; and

wherein the method comprises configuring the signal processor or processing module to determine if the system flow Q* requested at the pump idle speed is less than the flow threshold Q_thr for the period of prove time of T_P, and determine that if an NFSD condition is met and control may remain in the NFSD state or the NFI state, by following NFSD/NSI schemes and a NFSD flag remains raised;

or otherwise, turn the pump back to its normal operation if flow is detected in system, based upon the Equation;

Q_thr≤

Q* with t≥

T_p.

8. A method according to claim 7, wherein the method comprises configuring the signal processor or processing module as part of the pump.

9. A method according to claim 7, wherein the method comprises configuring one or more memory modules to store the signaling containing information about the pump no flow idle (NFI) state when the pump is running at the pump idle speed, and to provide the signaling to the signal processor or processing module.

10. A method comprising:

receiving with a signal processor or processing module signaling containing information about a pump no flow idle state (NFI) when the pump is running at a pump idle speed;

determining with the signal processor or processing module corresponding signaling containing information about whether the pump should remain in a no flow shutdown (NFSD) state or the NFI state, based upon the signaling received; and

providing control signaling to turn the pump OFF, based upon the corresponding signaling determined;

wherein the method comprises configuring the signal processor or processing module to determine the corresponding signaling by taking system pressure P* at a pump idle speed n_idle as a no flow detection parameter under the no flow condition, using an Equation;

(H₀−

db)≤

P*≤

H₀,t≥

T_p 

 

(3.2),

where H₀ is the idle pressure, (H₀−

db) is a pressure drop from the idle pressure, and T_P, is the period of prove time; and

wherein the method comprises configuring the signal processor or processing module to determine if the system pressure P* at the idle speed is less than the idle pressure H₀ and greater than the pressure drop (H₀−

db) from the idle pressure for the period of prove time of T_P, and determine if an NFSD condition is met and control may remain in the NFSD state or the NFI state, by following NFSD/NSI schemes and an NFSD flag remain raised;

or otherwise, turn pump back to its normal operation if flow is detected in system under the flow condition, based upon the Equation;

P*≤

(H₀−

db) with t≥

T_p.

11. A method comprising:

receiving with a signal processor or processing module signaling containing information about a pump no flow idle state (NFI) when the pump is running at a pump idle speed;

determining with the signal processor or processing module corresponding signaling containing information about whether the pump should remain in a no flow shutdown (NFSD) state or the NFI state, based upon the signaling received; and

providing control signaling to turn the pump OFF, based upon the corresponding signaling determined;

wherein the method comprises configuring the signal processor or processing module to determine the corresponding signaling by taking an instant system coefficient C_V at the pump idle speed of n_idle as a no flow detection parameter as well under the no flow condition, using an Equation;

0≤

C*_v≤

C_v-thr,t≥

T_p 

 

(3.3),

where C_v-thr is a system coefficient threshold, and T_P a period of prove time; and

wherein the method comprises configuring the signal processor or processing module to determine if the instant system coefficient C_V at the minimum speed is vanished or less than the system coefficient threshold of C_v-thr for the period of prove time of T_P, and determine if an NFSD condition is met and an NFSD flag is then raised accordingly;

or otherwise, turn the pump back to its normal operation if flow is detected in system under the flow condition, using an Equation;

C_v-thr≤

C*_V with t≥

T_p.

12. A method comprising:

receiving with a signal processor or processing module signaling containing information about a pump no flow idle state (NFI) when the pump is running at a pump idle speed;

determining with the signal processor or processing module corresponding signaling containing information about whether the pump should remain in a no flow shutdown (NFSD) state or the NFI state, based upon the signaling received; and

providing control signaling to turn the pump OFF, based upon the corresponding signaling determined;

wherein the method comprises configuring the signal processor or processing module to determine the corresponding signaling by taking motor power w* at the pump idle speed of n_idle as a no flow detection parameter as well under the no flow condition, using an Equation;

0≤

w*≤

w_thr,t≥

T_p 

 

(3.4),

where w* is the motor power, w_thr is a power threshold of w_thr, and T_P is a period of prove time; and

wherein the method comprises configuring the signal processor or processing module to determine if the motor power w* at the idle speed is less than the power threshold w_thr for the period of prove time T_P, and determine if an NFSD condition is met and a NFSD flag is then raised accordingly;

or otherwise, turn pump back to its normal operation if flow is detected in system under the flow condition, based upon an Equation;

w_thr≤

w* with t≥

T_p.