Angle Sensor Operation Processing Apparatus Using Cross-Coupled Lissajous Curves
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Solution Overview
Problem
Existing angle detection apparatuses require large circuit scales and high power consumption due to the need for arctangent operations on sensor signals from multiple magnetic sensor elements, leading to increased processing time.
Innovation Solution
An operation processing apparatus that calculates rotation angles using cross-coupled operations and Lissajous curve generation based on signals from first and second magnetic sensor elements with different signal frequencies and phases, reducing the need for extensive circuitry and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If arctangent operations are performed on sensor signals from multiple magnetic sensor elements, then rotation angle calculation accuracy is improved, but circuit scale increases and power consumption increases
Solution Approach 1:
The patent changes the computational parameters from direct arctangent operations to a two-stage process: first computing intermediate values (sinθ and cosθ) through cross-coupled operations, then deriving the final rotation angle. This parameter transformation reduces circuit complexity while maintaining calculation accuracy.
Solution Approach 2:
The rotation angle calculation is segmented into multiple processing stages: cross-coupled operation stage, intermediate value computation stage, and final angle derivation stage. This segmentation allows each stage to use simpler, optimized circuits rather than one complex arctangent operation circuit.
2Measurement precision
If arctangent operations are performed on sensor signals, then rotation angle calculation accuracy is improved, but operation processing time increases
Solution Approach 1:
The patent performs preliminary cross-coupled operations to compute intermediate sinθ and cosθ values before the final angle calculation. These preliminary computations are optimized to execute faster than direct arctangent operations, reducing overall processing time while preserving accuracy.
Solution Approach 2:
The patent replaces the traditional mechanical arctangent computation mechanism with an electrical cross-coupled operation system that processes signals through optimized circuit paths, achieving faster computation speeds while maintaining mathematical accuracy.
3Reliability
If multiple magnetic sensor elements are used, then measurement reliability is improved, but power consumption increases
Solution Approach 1:
The patent merges the signal processing paths of multiple magnetic sensor elements through cross-coupled operations, combining their outputs to compute rotation angle information. This merging approach maintains the reliability benefits of multiple sensors while reducing total power consumption through shared computational resources.
Solution Approach 2:
The cross-coupled operation circuit serves multiple functions simultaneously: it processes signals from multiple sensor elements, computes intermediate values, and prepares data for final angle calculation. This multi-functionality reduces the need for separate dedicated circuits for each sensor, lowering overall power consumption.
Data Source
AI summary
An operation processing apparatus that calculates a rotation angle based on a first output signal and a second output signal, which differ in signal frequency from each other, is provided with a first cross-coupled operation part that performs a first cross-coupled operation and a second cross-coupled operation part that performs a second cross-coupled operation based on the first and second output signals. A first Lissajous curve generation part generates a first Lissajous curve based on the result of operation by the first cross-coupled operation part, and a second Lissajous curve generation part generates a second Lissajous curve based on the result of operation by the second cross-coupled operation part. A rotation angle computing part calculates the rotation angle based on the first Lissajous curve and the second Lissajous curve.