US 2010/0161268 A1Published application

Device for vibration compensation of the weight signal of a weighing sensor

AssigneeWipotec Wiege- und Positioniersysteme GmbH

InventorsJan Gottfriedsen, Alexander Schulzki

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Abstract

Device for vibration compensation of weighing sensor weight signals, with a weighing signal branch having an analog/digital converter unit to which a weighing sensor analog weighing signal is fed, and that generates a digital weighing signal that contains discrete sample values of the sampled analog weighing signal of the weighing sensor. At least one compensation signal branch has an analog/digital converter unit to which an acceleration sensor analog noise quantity is fed for detecting a specified acceleration noise quantity, and that generates a digital noise quantity signal containing discrete sample values of the acceleration sensor analog noise quantity signal. The digital noise quantity signal is fed to an adaptive digital filter unit. An addition unit sums the signal values of the digital weighing signal and the signal values (carrying a negative sign) for the digital noise quantity signals fed to it.

Claims20

Dependent claims

A device for vibration compensation of a weight signal of a weighing sensor, the device comprising:

(a) a weighing signal branch that comprises an analog/digital converter unit to which the analog weighing signal of the weighing sensor can be fed and that generates a digital weighing signal that includes discrete sample values of the sampled analog weighing signal of the weighing sensor;
(b) at least one compensation signal branch including,
(i) an analog/digital converter unit, to which an analog noise quantity signal of an acceleration sensor is fed for detecting an acceleration noise quantity in a specified translational direction or about a specified rotational axis, adapted to generate a digital noise quantity signal containing discrete sample values of the sampled analog noise quantity signal of the acceleration sensor, and
(ii) a digital filter unit to which the digital noise quantity signal is fed, the digital filter unit formed as an adaptive digital filter unit;
(c) an addition unit for summing the signal values of the digital weighing signal fed to it and the signal values of the noise quantity signals fed to it carrying a negative sign;
(d) wherein the output signal of the addition unit or the filtered output signal of the addition unit or the digital weighing signal is fed to the filter unit as a control signal;
and
(e) wherein a frequency response of the filter unit is adapted as a function of the control signal to the frequency response dependent on the total load force acting on the weighing sensor relative to interference acceleration forces in the specified translation direction or about the specified rotational axis, such that the frequency response of the relevant compensation signal branch including the relevant, associated acceleration sensor is essentially identical to the frequency response of the weighing signal branch including the weighing sensor relative to interference acceleration forces in the specified translation direction or about the specified rotational axis or approximates this response with a specified accuracy.

5 more elements

A device for vibration compensation of a weight signal of a weighing sensor, the device comprising:

(a) at least one compensation signal branch comprising an analog/digital converter unit, to which the analog noise quantity signal of an acceleration sensor is fed for detecting an acceleration noise quantity in a specified translational direction or about a specified rotational axis, adapted to generate a digital noise quantity signal containing discrete sample values of the sampled analog noise quantity signal of the acceleration sensor, and
(b) a weighing signal branch comprising:
(i) an analog/digital converter unit to which the analog weighing signal of the weighing sensor can be fed and that generates a digital weighing signal that includes discrete sample values of the sampled analog weighing signal of the weighing sensor;
and
(ii) a digital filter unit to which the digital noise quantity signal is fed, the digital filter unit formed as an adaptive digital filter unit;
(c) an addition unit for summing the signal values of the digital weighing signal fed to it and the signal values of the noise quantity signals fed to it carrying a negative sign;
(d) wherein the output signal of the addition unit or the filtered output signal of the addition unit or the digital weighing signal is fed to the filter unit as a control signal;
and
(e) wherein the frequency response of the filter unit is adapted as a function of the control signal to the frequency response dependent on the total load force acting on the weighing sensor relative to interference acceleration forces in the specified translation direction or about the specified rotational axis, such that the frequency response of the weighing signal branch including the acceleration sensor is essentially identical to the frequency response of the compensation signal branch including the weighing sensor relative to interference acceleration forces in the specified translation direction or about the specified rotational axis or approximates this response with a specified accuracy.

6 more elements

Dependencies are inferred from the claim text.