Angle Sensor Temperature Correction via Stored Factors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing temperature correction methods for angle sensors in flow rate regulating valves require expensive equipment and extensive screening to create historic records, leading to high costs and poor manufacturability due to the need for precise zero point characteristics and separate temperature sensors.
Innovation Solution
An angle sensor temperature correcting device that uses a bridge circuit with magnetoresistive elements and a magnetic field generating portion, storing zero and span correcting factors at a reference temperature to perform temperature correction without the need for historic records or separate temperature sensors, allowing for superior correction results at a low cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional temperature correction methods using historic records are employed, then temperature correction accuracy is improved, but manufacturing cost and complexity increase due to expensive equipment and extensive screening requirements
Solution Approach 1:
The patent extracts only the essential correction factors (zero point correction factor and span correction factor) needed for temperature compensation, eliminating the need for comprehensive historic records. This is achieved by storing correction factors obtained through simple screeners with predetermined inclination, rather than requiring complex historical temperature-data pairs.
Solution Approach 2:
The patent replaces expensive, complex temperature correction systems with a simple, cost-effective approach using basic screeners and stored correction factors. The system uses inexpensive components (simpler than conventional temperature sensors and historic record systems) that can be easily manufactured and deployed without extensive screening equipment.
2Measurement precision
If separate temperature sensors are added to achieve accurate temperature correction, then temperature measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the angle sensor serve multiple functions: it simultaneously measures angle position and provides temperature information through its output signal characteristics. The same sensor output is used for both angular measurement and temperature correction, eliminating the need for separate temperature sensors.
Solution Approach 2:
The angle sensor system performs its own temperature correction using its output signal characteristics without requiring external temperature sensors. The system self-diagnoses temperature effects and applies correction using stored correction factors, making the temperature correction function self-contained within the existing sensor system.
3Measurement precision
If precise zero point characteristics are required for temperature correction, then correction accuracy is improved, but manufacturing yield decreases due to poor manufacturability
Solution Approach 1:
The patent changes the approach from requiring precise inherent zero point characteristics to using stored correction factors that compensate for zero point variations. By obtaining correction factors through simple screeners with predetermined inclination and storing them for later use, the system achieves accurate correction without demanding tight manufacturing tolerances on zero point characteristics.
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 temperature correction of angle information from the angle sensor without the need for expensive equipment or extensive screening, reducing costs and improving manufacturability by using stored correcting factors to adjust for zero point and span shifts.
Implementation Method 1
The angle sensor 6 is structured from four magnetoresistive elements that are connected in a bridge
Implementation Method 2
four magnetoresistive elements (AMR elements ("anisotropic magnetoresistive" devices)) r1, r2, r3, and r4, which are shaped as zigzags, are formed on a substrate 60a with point symmetry so that the zigzag directions thereof are mutually perpendicular
Data Source
AI summary
An angle sensor temperature correcting device includes: a zero correcting factor storing portion that stores, as a reference temperature bridge midpoint potential difference offset and a bridge total resistance indicating value, a difference from an actual correct value, for a relative angle between a bridge circuit and a magnetic field, for the bridge midpoint potential difference, and a value indicating the total resistance of the bridge circuit, at a reference temperature, and stores, as a zero correcting factor, a ratio of the bridge midpoint potential difference offset and the bridge total resistance indicating value at the reference temperature; and a temperature correcting portion that performs temperature correction on angle information obtained from the bridge midpoint potential difference of the bridge circuit at a given time, based on a zero correcting factor stored in the zero correcting factor storing portion.