Angle Measuring System Dual Sensor Pattern Detection

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Solution Overview

Problem

Existing angle-measuring systems face challenges in reliably differentiating between regular and irregular patterns due to rotation irregularities caused by vibrations and acceleration in crankshafts, leading to delayed and unreliable detection.

Innovation Solution

The system employs two sensors disposed at a distance in the circumferential direction to scan signal-generating elements, allowing for immediate differentiation of patterns without time measurement, as both sensors are equally affected by rotation irregularities, enhancing reliability, especially when patterns differ slightly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If time measurement is used to differentiate regular and irregular patterns, then angle position can be determined, but detection is delayed and reliability decreases due to rotation irregularities

Engineering Contradiction:

Improvepattern detection accuracyVSAvoiddetection delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The single sensor approach is segmented into two sensors positioned at different circumferential locations. This allows parallel signal acquisition from the same track, enabling immediate pattern differentiation without waiting for complete rotation scanning, thus eliminating detection delay while maintaining accuracy even under rotation irregularities

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transitions from temporal measurement (time-based single sensor scanning) to spatial measurement (distance-based two sensor comparison). By measuring the distance between two sensors and comparing their simultaneous signals, the system eliminates time delay and becomes insensitive to rotation speed variations and irregularities

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If single sensor scanning is used, then device complexity is reduced, but pattern detection reliability decreases under rotation irregularities

Engineering Contradiction:

Improvepattern detection reliabilityVSAvoidsensor configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The detection function is segmented between two sensors, each contributing to pattern recognition. This segmentation provides redundancy and comparison capability, making the system reliable under rotation irregularities while keeping each individual sensor simple

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The signals from two separate sensors are merged and compared in the evaluation unit. This combining approach enhances reliability through cross-validation without requiring complex individual sensor designs, maintaining simplicity while achieving robust pattern detection

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If large distance between sensors is used, then pattern differentiation improves, but sensitivity to rotation irregularities increases

Engineering Contradiction:

Improvepattern differentiation capabilityVSAvoidsensitivity to rotation irregularities

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The invention optimizes the distance parameter between sensors to a specific range that balances pattern differentiation capability with insensitivity to rotation irregularities. This parameter optimization ensures reliable detection without excessive sensitivity to rotational variations

Inventive Principle:

Principle #35Parameter changes

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 approach improves the reliability of pattern detection by eliminating the influence of rotation irregularities, enabling immediate and accurate identification of irregular elements, even when patterns are only slightly different, and reduces the impact of asymmetrical magnetic pole effects.

Implementation Method 1

The transmitter can generate magnetic signals. It is necessary to differentiate between passive and active transmitters. With passive transmitters, the signal-generating elements are formed, for example, by a toothed wheel made of a magnetically conductive material.

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Data Source

PatentUS7391009B2Angle-measuring system having irregular reference mark that is dedicated without time delay

Publication Date: 2008.06.24 CARL FREUDENBERG KG

AI summary

An angle-measuring system comprising at least one transmitter provided with a number of complementary signal-generating elements disposed in pairs and creating a pattern of signals. The elements create a reference mark irregularly configured at least at one spot. A device for acquiring the signals and an evaluation unit are also part of the angle-measuring system. The device is provided with at least one first sensor and one second sensor.