Weight Sensor Tilt Compensation via Triaxial Acceleration
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Solution Overview
Problem
Conventional weight-bearing measurement methods fail to accurately measure the gravity and mass of an object when the weight-bearing device tilts, leading to incorrect motor torque output and potential unbalanced operation.
Innovation Solution
A weight-bearing measurement device comprising a deformable body with a bridge circuit and an acceleration sensor that detects gravity components in multiple directions, allowing for accurate calculation of object mass and gravity even when the device is tilted, using a processing unit to calculate mass based on acceleration components and output voltage from the bridge circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional weight-bearing measurement method is used that assumes gravity is perpendicular to the deformable body, then the measurement is simple and only considers deformation in the gravity direction, but the measurement accuracy deteriorates when the device tilts during movement
Solution Approach 1:
The patent introduces acceleration sensors to detect gravity components in multiple directions (U, V, and W directions perpendicular to each other), transforming the measurement from a single-dimensional gravity assumption to a multi-dimensional gravity component analysis. This allows accurate mass calculation even when the deformable body is tilted, as the processing unit calculates mass based on the combined acceleration components from all three directions rather than assuming gravity is always perpendicular to the bearing face.
2Adaptability or versatility
If the weight sensor is used in a tilted status during movement, then the device can perform weight-bearing movement functions, but the measurement accuracy of gravity and mass deteriorates leading to excessive or insufficient motor output torque
Solution Approach 1:
The patent introduces acceleration sensors as intermediary devices that detect the actual gravity components in the U, V, and W directions when the device is tilted. These acceleration sensor readings serve as intermediaries between the tilted deformable body and the mass calculation, allowing the processing unit to accurately determine mass despite the tilt angle. This intermediary measurement approach enables the system to maintain both movement capability and measurement accuracy simultaneously.
3Ease of operation
If the deformable body is tilted during movement, then the weight-bearing equipment can change orientation and position, but the conventional measurement method fails to provide accurate data for motor control
Solution Approach 1:
The patent implements a feedback mechanism where acceleration sensors continuously detect the actual gravity components in the U, V, and W directions during movement, and the processing unit uses this real-time feedback to calculate accurate mass values. This feedback loop ensures that even when the deformable body tilts during movement, the motor control system receives accurate mass data to adjust output torque appropriately, maintaining reliable control throughout the movement process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate measurement of object mass and gravity in any orientation, providing precise data for motor control to ensure smooth operation of weight-bearing equipment.
Implementation Method 1
the bridge circuit comprises at least one resistance strain gauge that is disposed on the deformable body, and the bridge circuit is configured to generate an output voltage that represents the deformation
Implementation Method 2
an acceleration sensor configured to detect acceleration components of the deformable body under the action of gravity of the borne object in a U direction, a V direction and a W direction
Data Source
AI summary
The present invention discloses a weight-bearing measurement device and method and weight-bearing equipment. The weight-bearing measurement device comprises a weight sensor, an acceleration sensor and a processing unit, wherein the weight sensor comprises a deformable body and a bridge circuit, the deformable body deforms under the action of gravity of a borne object, the bridge circuit comprises at least one resistance strain gauge disposed on the deformable body and is configured to generate an output voltage that represents the deformation under the action of an input voltage; the acceleration sensor is configured to generate acceleration components in three directions perpendicular to one another respectively under the action of gravity of the borne object; and the processing unit is configured to calculate the gravity and/or the mass of the borne object in accordance with the acceleration components in the three directions, the input voltage, the output voltage, and conversion coefficients of the bridge circuit in the three directions.