Method for averaging pulsating measurement quantities

Patent metadata

Field	Value
Publication number	US-11095270-B2
Application number	US-201816201374-A
Country	US
Kind code	B2
Filing date	Nov 27, 2018
Priority date	Nov 30, 2017
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A method for averaging pulsating measurement quantities is disclosed. First, time-discrete measurement values ( 1 ) of the measurement quantity are recorded. Subsequently, first filtering of the measurement values ( 1 ) is carried out with a first filter time constant, during which a first signal ( 2 ) is obtained, and second filtering of the measurement values ( 1 ) with a second filter time constant, during which a second signal ( 3 ) is obtained, the second filter time constant being greater than the first filter time constant. Intersection points ( 4 ), at which the first signal ( 2 ) and the second signal ( 3 ) intersect, are then determined. Lastly, the arithmetic mean of the measurement values ( 1 ) between the intersection points ( 4 ) is taken.

First claim

The invention claimed is:

1. A method for averaging pulsating measurement quantities to regulate a pump, the method comprising:
recording, via an electronic control device, time-discrete measurement values ( 1 , 1 ′, 1 ″) of the measurement quantity,
first filtering of the measurement values ( 1 , 1 ′, 1 ″) with a first filter time constant and via the electronic control device, during which a first signal ( 2 ) is obtained;
second filtering of the measurement values ( 1 , 1 ′, 1 ″) with a second filter time constant and via the electronic control device, during which a second signal ( 3 ) is obtained, the second filter time constant being greater than the first filter time constant;
determining, via the electronic control device, intersection points ( 4 ; 6 ; 9 ), at which the first signal ( 2 ) and the second signal ( 3 ) intersect, wherein the time difference between neighboring intersection points ( 4 ; 6 ; 9 ) corresponds to a period T p of pulsation;
regulating the pump by means of the period T p and/or rotational speed;
determining, via the electronic control device, the arithmetic mean of the measurement values ( 1 , 1 ′, 1 ″) between the intersection points ( 4 ; 6 ; 9 ); and
detecting a fault or perturbation in the pump.

2. The method according to claim 1 , wherein only intersection points ( 4 ) at which the first signal ( 2 ) is decreasing and intersects the second signal ( 3 ) are determined.

3. The method according to claim 1 , wherein only intersection points ( 6 ) at which the first signal ( 2 ) is increasing and intersects the second signal ( 3 ) are determined.

4. The method according to claim 1 , wherein averaging is carried out between average values ( 5 ) of the intersection points at which the first signal ( 2 ) is decreasing and average values ( 7 ) of the intersection points at which the first signal ( 2 ) is increasing, and the fault or perturbation is detected when, in the case of neighboring average values ( 5 , 7 ) determined in a same way, one of the two average values ( 5 , 7 ) lies outside a predetermined value range around the respective other average value ( 5 , 7 ).

5. The method according to claim 1 , wherein at least ten measurement values ( 1 ) during a pulsation of the measurement quantity are recorded during the recording of the time-discrete measurement values ( 1 ).

6. The method according to claim 1 , wherein a linear interpolation of the first signal ( 2 ) and the second signal ( 3 ) is carried out during the determination of the intersection points ( 9 ).

7. The method according to claim 1 , wherein the cutoff frequency of the first filtering is about two times the frequency of the pulsation of the measurement quantity.

8. The method according to claim 1 , wherein the second filter time constant is approximately four times the first filter time constant.

9. A non-transitory computer-readable medium containing a computer program that when executed by an electronic control device causes the electronic control device to detect a fault or perturbation for a pump, the electronic control device configured to:
record time-discrete measurement values ( 1 , 1 ′, 1 ″) of a measurement quantity,
first filter the measurement values ( 1 , 1 ′, 1 ″) with a first filter time constant, during which a first signal ( 2 ) is obtained;
second filter the measurement values ( 1 , 1 ′, 1 ″) with a second filter time constant, during which a second signal ( 3 ) is obtained, the second filter time constant being greater than the first filter time constant;
determine intersection points ( 4 ; 6 ; 9 ), at which the first signal ( 2 ) and the second signal ( 3 ) intersect, wherein the time difference between neighboring intersection points ( 4 ; 6 ; 9 ) corresponds to a period T p of pulsation;
regulate the pump by means of the period T p and/or rotational speed;
determine the arithmetic mean of the measurement values ( 1 , 1 ′, 1 ″) between the intersection points ( 4 ; 6 ; 9 ); and
average between the average values ( 5 ) of the intersection points at which the first signal ( 2 ) is decreasing and the average values ( 7 ) of the intersection points at which the first signal ( 2 ) is increasing, and
detect a fault or perturbation in the pump when, in the case of neighboring average values ( 5 , 7 ) determined in a same way, one of the two average values ( 5 , 7 ) lies outside a predetermined value range around the respective other average value ( 5 , 7 ).

10. An electronic control device, which is adapted to average a pulsating measurement quantity by means of a method according to claim 1 .

11. The electronic control device according to claim 10 , wherein the time-discrete measurement values ( 1 , 1 ′, 1 ″) include pressure values.

12. The electronic control device according to claim 10 , wherein the pump comprises a diaphragm pump.

13. The method according to claim 1 , wherein the time-discrete measurement values ( 1 , 1 ′, 1 ″) include pressure values.

14. The method according to claim 1 , wherein the pump comprises a diaphragm pump.

15. The method according to claim 14 , wherein the time-discrete measurement values ( 1 , 1 ′, 1 ″) include pressure values.

16. A method for averaging pulsating measurement quantities to regulate a rotating component, the method comprising:
recording, via an electronic control device, time-discrete pressure values ( 1 , 1 ′, 1 ″) of pressure,
first filtering of the pressure values ( 1 , 1 ′, 1 ″) with a first filter time constant and via the electronic control device, during which a first signal ( 2 ) is obtained;
second filtering of the pressure values ( 1 , 1 ′, 1 ″) with a second filter time constant and via the electronic control device, during which a second signal ( 3 ) is obtained, the second filter time constant being greater than the first filter time constant;
determining, via the electronic control device, intersection points ( 4 ; 6 ; 9 ), at which the first signal ( 2 ) and the second signal ( 3 ) intersect, wherein the time difference between neighboring intersection points ( 4 ; 6 ; 9 ) corresponds to a period T p of pulsation;
determining a rotational speed from an inverse of the period T p ; and
regulating the rotating component.

17. The method according to claim 16 , wherein the rotating component comprises a pump.

18. The method according to claim 17 , wherein the pump comprises a diaphragm pump.

19. The method according to claim 17 , wherein the pump is part of a delivery and dosing system.

20. The non-transitory computer-readable medium according to claim 9 , wherein the time-discrete measurement values ( 1 , 1 ′, 1 ″) include pressure values.

Assignees

• Bosch Gmbh Robert

Inventors

• Farr Thomas

Classifications

• H03H17/026 Primary

  Averaging filters · CPC title

• G01D9/005 Primary

  Solid-state data loggers · CPC title

• G01F15/0755

  involving digital counting · CPC title

• G01F1/72

  Devices for measuring pulsing fluid flows · CPC title

• G01F3/00

  Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow (measuring a proportion of the volume flow G01F5/00) · CPC title