Hall-Sensor Valve Position Sensing With Offset Magnet Layout
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Solution Overview
Problem
Existing valve position sensing systems using Hall sensors face challenges due to varying sensor properties and complex calculations required to correct for these variations, particularly in three-dimensional measurements, leading to inefficiencies in determining the valve's open or closed state.
Innovation Solution
The system employs a Hall sensor with two partial sensors aligned in orthogonal measuring directions, positioning the signal transmitter at a distance and offset relative to the sensor's centerline, allowing for similar sensor characteristics and simplified error correction through a quotient of measurement signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three-dimensional measurement signals from x and z partial sensors are used, then position sensing capability is improved, but evaluation complexity increases due to varying sensor properties requiring complex calculations or error corrections
Solution Approach 1:
The invention extracts only the necessary measurement information from the Hall sensor by using two partial sensors arranged in the measurement zone plane. This selective extraction of measurement signals from x and y partial sensors avoids the complexity of processing three-dimensional signals while maintaining sufficient position sensing capability.
Solution Approach 2:
The invention changes the spatial arrangement parameters of the partial sensors and signal transmitter. Specifically, the signal transmitter is positioned at an offset distance from the measurement zone center in the y-direction, which optimizes the magnetic field distribution to provide sufficiently large signals from both x and y partial sensors with similar characteristics, simplifying the evaluation process.
2Measurement precision
If the signal transmitter is positioned close to the Hall sensor, then signal amplitude is improved, but manufacturing and alignment precision requirements increase
Solution Approach 1:
The invention moves the signal transmitter arrangement from a direct axial alignment (z-direction only) to an offset position in the y-direction. This dimensional change allows the signal transmitter to be positioned at a controlled distance from the measurement zone while still providing sufficient magnetic field strength to both x and y partial sensors, reducing alignment precision requirements.
3Measurement precision
If the axis of movement is offset from the measurement zone centerline, then signal strength from y partial sensor is improved, but distance from Hall sensor increases
Solution Approach 1:
The invention optimizes the offset distance parameter in the y-direction to achieve a balance between signal strength and distance. The signal transmitter is positioned at a specific offset distance that provides sufficiently large signals from the y partial sensor while maintaining an acceptable distance from the Hall sensor measurement zone.
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
This arrangement simplifies the evaluation process by canceling out identical sensor errors and reducing similar errors, enabling precise and efficient determination of the valve's position without complex calculations.
Implementation Method 1
it is known to arrange a magnet as a signal transmitter on a linearly movable valve tappet connected to the valve element, which moves in the sensing range of a Hall sensor. The measurement signal generated in this way in the Hall sensor is used to determine the position.
Data Source
AI summary
A valve has a position sensing mechanism including at least one Hall sensor and a signal transmitter, wherein the Hall sensor senses magnetic field components in a first measuring direction and in a second measuring direction orthogonal thereto, wherein the two measuring directions are arranged in a planar measurement zone of the Hall sensor. The signal transmitter is an axially polarized magnet which is arranged on a valve tappet linearly displaceable along an axis of movement such that the poles thereof lie in the axis, wherein the axis runs parallel to the first measuring direction and at a distance from the measurement zone along a surface normal of the measurement zone. An imaginary centerline is defined on the measurement zone through a center of the measurement zone and along the first measuring direction, wherein the axis is arranged at a distance from the imaginary centerline along the second measuring direction.