Method and measuring device for volume measurement and evaluation

摘要

The invention relates to a method for measuring the volumetric flow (Q) of a fluid in a preferred direction by means of a volume measurement device having an electronic circuit and an incremental encoder, a sensor for detecting a rotational change of angle, preferably designed as two giant magnetoresistance (GMR) sensors in a double measuring bridge, wherein a first sinusoidal signal of the incremental encoder, namely a raw sine signal (S1), and a second sinusoidal signal of the incremental encoder with identical angular frequency ω which is phase-shifted by 90° relative to the first signal (S1), namely a raw cosine signal (S1), are generated, wherein said signals (S1) are preferably initially conditioned (S1+), interpolated/digitized (S2), and said digital signals (S2) are processed and evaluated in an evaluation unit, preferably in a process computer unit having a quadrature encoder counter. The invention further relates to a method for measuring a volumetric flow by means of a quadrature signal, comprising a first signal from a first sensor and a second signal from a second sensor having identical angular frequency ω which are phase-shifted by 90° relative to one another, wherein the quadrature signal serves to determine the flow (Q) of a fluid in a preferred direction by a volume measurement device having an electronic circuit. The invention further relates to a volume measurement device for carrying out a measurement method and to a programmable process computer unit having at least one quadrature encoder interface/quadrature encoder encounter for use in a volume measurement device for measuring a volumetric flow.

主权项

1. A method for measuring a volumetric flow (Q) of a fluid in a preferred direction by a volume measurement device, said volume measurement device comprises an electronic circuit and an incremental encoder; and a sensor for detecting a rotational change of angle, designed as two giant magnetoresistance (GMR) sensors in a double measuring bridge, wherein a first sinusoidal signal of the incremental encoder, namely a raw sine signal, and a second sinusoidal signal of the incremental encoder having identical angular frequency ω which is phase-shifted by 90° relative to the first sinusoidal signal, namely a raw cosine signal, first conditioned (S1+), and then interpolated/digitized (S2), and these interpolated/digitized signals (S2) are processed and evaluated in an evaluation unit or a process computer unit having a quadrature encoder counter, said the method comprising the steps of:
a) Detecting the flow of the fluid; b) Determining the direction of flow of the fluid; c) Determining the state of flow of the fluid: flowing in the preferred direction, shivering and/or oscillating; and d) Further conducting the interpolated/digitized signals (S2) as a function of the state of the fluid to an output stage in the form of a quadrature signal with pulse filtering (S3), namely:
(i) In the case of flowing in the preferred direction: further conducting the original interpolated/digitized signal (S2); and(ii) In the case of shivering and/or oscillating: changing the interpolated/digitized signal (S2) to a base signal (no movement of the fluid) and further conducting the modified digital signal, which signals no flow (base signal).