US 5,347,092 AGranted

Compensation scale for measuring the weight or mass of an object

AssigneeRobert Bosch GmbH

InventorsWilly Buchs, Roland Cochard, Pierre Jeannin

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Abstract

Proposed is a compensation scale (10) in which at least one acceleration sensor (24, 25) is disposed at a movable component (14) of the scale (10) and puts out a signal to a correction signal processing arrangement (50) which determines at least one correction signal (53, 54, 56) for influencing the measuring result that appears at the output (43) as a measure for the weight or the mass (m) of the load (15) with which the movable component (14) was charged. The correction signals (53, 54, 56) eliminate the influence of translatory and rotatory interference accelerations (y, .THETA.) which act on the base plate (11) of the scale and, without being corrected, would falsify the measuring result (43) or at least unduly extend the measuring time.

Claims19

Dependent claims

A compensation scale comprising,

a movably guided component that is deflected from a predetermined position relative to a carrier of the scale in at least one direction by a load whose weight or mass is to be determined;
an electromagnetic arrangement which includes at least one coil for generating a force relative to the load;
a lever coupled to the movably guided component and mounted to move about a pivot point for influencing the force generated by the electromagnetic arrangement relative to the load;
a position sensor which determines the position of the movable component relative to the carrier and outputs a signal;
a controller which determines current flowing through the coil as a function of the signal output by the position sensor so that the movable component returns to the predetermined position with the current being a measure for the weight or the mass of the load, the controller producing an uncorrected measuring result signal related to the current;
at least two acceleration sensors disposed at the movable component for determining the translatory acceleration in the at least one direction and a rotational acceleration of the movable component about a rotation axis passing through the pivot point and essentially perpendicular to the lever, the acceleration sensors outputting signals to a correction signal processing arrangement which determines at least one correction signal for correcting the uncorrected measuring result signal representing the measure for the weight or mass of the load to produce a corrected measuring result signal.

3 more elements

A compensated scale for measuring weight or mass of an object, comprising:

a position sensor for determining a position of a load in a first direction with respect to a first position and generating a position signal;
a control device coupled to the position sensor and responsive to the position signal for generating a first current signal;
an electromagnetic device coupled to the control device and responsive to the first current signal for generating a force for positioning the load in a direction opposite the first direction for reestablishing the load to the first position;
a first signal generator, responsive to the first current signal, for generating an uncorrected measurement signal related to the first current;
a first acceleration sensor for sensing a first acceleration of the load and generating a first correction signal;
a second acceleration sensor for sensing a second acceleration of the load and generating a second correction signal;
a correction signal processing device coupled to the first and second acceleration sensors, the correction signal processing device including
a translatory acceleration device for determining the translatory acceleration of the load and generating a translatory acceleration correction signal based on the first and second correction signals, and
a rotational acceleration device for determining the rotational acceleration of the load and generating a rotational acceleration correction signal based on the first and second correction signals;
and
a signal combiner coupled to the uncorrected measurement signal, the translatory acceleration correction signal and the rotational acceleration correction signal for generating a corrected measurement signal representing the weight or mass of the load.

8 more elements

Dependencies are inferred from the claim text.