Method of determining hydraulic operating point of a pump
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04D-015/00
F04D-013/06
F04D-001/00
출원번호
US-0114996
(2015-03-26)
등록번호
US-10184476
(2019-01-22)
우선권정보
DE-10 2014 004 336 (2014-03-26)
국제출원번호
PCT/EP2015/000642
(2015-03-26)
국제공개번호
WO2015/144310
(2015-10-01)
발명자
/ 주소
Sanders, Tilmann
Fiedler, Jens
출원인 / 주소
WILO SE
대리인 / 주소
Wilford, Andrew
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
The invention relates to a method of determining a first hydraulic variable (Q) of a pump assembly (1) operated at a predefinable rotation speed (n0) from a mechanical or electrical variable (Mactual, Pel, nactual) by evaluating a correlation between the hydraulic variable (Q) with the mechanical or
The invention relates to a method of determining a first hydraulic variable (Q) of a pump assembly (1) operated at a predefinable rotation speed (n0) from a mechanical or electrical variable (Mactual, Pel, nactual) by evaluating a correlation between the hydraulic variable (Q) with the mechanical or electrical variable (Mactual, Pel, nactual). A control parameter (Msetpoint, nsetpoint) of the pump assembly (1) is acted on by a periodic excitation signal (fA,n (t), fA,H(t)) having a predetermined frequency (f) such that a second hydraulic variable (H, Δp) is modulated. The instantaneous value of the first hydraulic variable (Q) is determined from the mechanical or electrical variable (Mactual (t), Pel (t), nactual (t)) as a system response (X(t)) to the excitation signal (fA,n (t), fA,H(t)), using the correlation. The invention further relates to a pump control system and a pump assembly that are configured for carrying out the method.
대표청구항▼
1. A pump assembly having a pump electronics system for controlling the set-point rotation speed of a pump assembly, wherein the pump electronics system is configured to determine the volumetric flow of the pump assembly by the steps of: operating the pump assembly at a predetermined set-point rotat
1. A pump assembly having a pump electronics system for controlling the set-point rotation speed of a pump assembly, wherein the pump electronics system is configured to determine the volumetric flow of the pump assembly by the steps of: operating the pump assembly at a predetermined set-point rotation speed or set-point torque;generating a period excitation signal having a predetermined frequency;modulating the delivery head or the differential pressure of the pump assembly by applying the periodic excitation signal to the set-point rotation speed or the set-point torque;determining as a system response to the modulation one of the following: the electrical power consumed by the pump assembly, orthe electrical current consumed by the pump assembly, or,if the periodic excitation signal is applied to the set-point rotation speed, the torque delivered by the pump assembly, or,if the periodic excitation signal is applied to the set-point torque, the rotation speed of the pump assembly; anddetermining the volumetric flow from the system response by using a correlation in form of a table or at least one mathematical function describing a relationship between the volumetric flow and the system response. 2. The pump assembly according to claim 1, wherein the pump electronics system is further configured to carry out the step of: determining the amplitude or the phase position of the alternating component of the system response; anddetermining the volumetric flow from the amplitude of the phase position using the correlation. 3. The pump assembly according to claim 2, wherein the table or the at least one mathematical function for a given rotational speed or a plurality of rotational speeds an amplitude value or phase value of the alternating component with each value or a number of values of the volumetric flow. 4. The pump assembly according to claim 1, wherein the pump electronics is further configured to perform the steps of: calculating a product of the system response and a periodic function having the same frequency or a multiple of the frequency of the excitation signal, ora product of the system response and the alternating component of the system response,computing the integral of one of these products over a predetermined integration period, anddetermining the volumetric flow from the value of the integral, using the correlation. 5. The pump assembly according to claim 4, wherein the table or the at least one mathematical function that associates for a given rotational speed or a plurality of rotational speeds a value of the integral with each value or a number of values of the volumetric flow. 6. The pump assembly according to claim 5, wherein the periodic function is a sine function, and a value of the volumetric flow is determined from the table or the mathematical function that is associated with the computed value of the integral in the table, or that is associated by the mathematical function. 7. The pump assembly according to claim 4, wherein the table or the at least one mathematical function associates for a given rotational speed or a plurality of rotational speeds a value of the system response with each value of the volumetric flow, and the periodic function is a cosine function, and for the instantaneous operating point the value or the algebraic sign of the computed value of the integral is used for distinguishing which portion of the table or which value range of the mathematical function is valid for determining the value of the volumetric flow. 8. The pump assembly according to that claim 4, wherein the integration period is one period or a multiple of the period of the excitation signal. 9. The pump assembly according to claim 4, wherein the integration is carried out during the modulation. 10. The pump assembly according to claim 4, wherein during the computation of the integral, at least one further integral is computed from a product of the system response on the one hand and the periodic function, or the alternating component of either the actual torque or the actual rotation speed of the pump assembly on the other hand over the same integration period, wherein the start of integration of the further integral is offset in time with respect to the start of integration of the first integral, and the computed values of the integrals are averaged to form one value. 11. The pump assembly according to claim 4, wherein the pump electronics is further configured to execute the steps of: determining the values of the system response at the start and at the end of the integration period,determining from these values a change in the system response per unit timesubtracting this change from all values of the system response determined during the integration period, and thereaftercomputing the integral. 12. The pump assembly according to claim 1, wherein the excitation signal, is a sinusoidal signal or a signal containing a sine function. 13. The pump assembly according to claim 1, wherein the frequency of the excitation signal is between 0.01 Hz and 100 Hz. 14. The pump assembly according to claim 1, wherein the amplitude of the excitation signal is less than 25% of the set-point rotation speed of a rotation speed control of the pump assembly, and is between 0.1% and 25% of the set-point rotation speed. 15. The pump assembly according to claim 1, wherein the amplitude of the excitation signal is computed based on a desired delivery head fluctuation, using a mathematical equation that describes the relationship between the actual rotation speed and the delivery head at the pump assembly.
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이 특허에 인용된 특허 (2)
Bartley ; Thomas S. ; Rosenblath ; Jr. ; Quinlan T., Apparatus and method for the indirect measurement and control of the flow rate of a liquid in a piping system.
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