Method of determining hydraulic operating point of a pump

US10184476B2 · kind B2 · utility

Assignee

• WILO SE · DE

Inventors

• Tilmann Sanders · Dortmund, DE
• Jens Fiedler · Potsdam, DE

Key dates

• Filing date: Mar 26, 2015
• Grant date: Jan 22, 2019
• Expiry date: Mar 26, 2035

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04D1/00
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

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.