Rotary Angle Determination Without Dedicated Sensors

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Solution Overview

Problem

Existing methods for determining rotary angle related data of vehicle wheels require rotary angle sensors, increasing costs and complexity, while often providing more resolution than necessary for quality control and balancing operations.

Innovation Solution

A method and apparatus that omit rotary angle sensors by using measurement data from sensors like vibration, load force, and position sensors to calculate rotary angles based on rotational speed and revolution periods, allowing for relative or absolute angle determination without an external reference mark, and utilizing autocorrelation functions or Fast Fourier Transformations to establish a rotary reference angle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a rotary angle sensor is used to detect wheel rotary position with sufficient resolution, then precise rotary angle related data can be obtained, but costs and number of parts increase

Engineering Contradiction:
Improverotary angle measurement precisionVSAvoidnumber of parts
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the rotary angle detection function from a dedicated rotary angle sensor and relocates it to the existing vibration sensor system. By processing vibration signal phases, the system obtains rotary angle information without requiring separate angle sensing components, thereby reducing part count while maintaining measurement precision.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The vibration sensor serves multiple functions: it detects both vibration magnitude and phase information. The phase information is then utilized to determine rotary angle position, making the vibration sensor a multi-functional component that eliminates the need for dedicated angle sensors.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Measurement precision

If a rotary angle sensor with high resolution is used, then suitable and precise rotary angle related data can be generated, but costs increase

Engineering Contradiction:
Improverotary angle data precisionVSAvoidmanufacturing cost
Core Design Contradiction:
Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces expensive rotary angle sensors with cheaper vibration sensors that already exist in the balancing apparatus. The vibration sensors are standard components used for imbalance detection, and by repurposing them for angle detection through phase analysis, the system avoids additional costly components.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes mechanical/optical rotary angle sensors with an electronic signal processing approach. Instead of using physical sensors to detect angle position, the system uses electronic analysis of vibration signal phases to compute rotary angle information, reducing hardware costs.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If measurement data is associated with rotary angle positions using a rotary angle sensor, then accurate rotary angle related data is obtained, but the apparatus becomes more complex

Engineering Contradiction:
Improverotary angle data accuracyVSAvoidsensor system complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges the rotary angle detection function with the existing vibration measurement system. By combining angle detection and vibration measurement into a single integrated process using phase analysis, the system reduces overall complexity while maintaining accurate rotary angle data association.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The vibration sensor system performs self-service by generating rotary angle information from its own measurement signals. The phase information inherent in the vibration data is processed to provide angle positioning, making the system self-sufficient without external angle sensors.

Inventive Principle:
Principle #25Self-service

Data Source

PatentEP2741066B1Method of determining rotary angle related data of a vehicle wheel
Publication Date: 2019.04.17 SNAP ON EQUIP SRL
  • EP2741066B1 patent drawingFigure 1
  • EP2741066B1 patent drawingFigure 2
  • EP2741066B1 patent drawingFigure 3

AI summary

A method and an apparatus for determining rotary angle related measurement data of a body mounted rotatable about an axis of rotation, the body being a vehicle wheel or a part of a vehicle wheel, in particular a tyre or a rim, the method comprising the steps of obtaining measurement data comprising a plurality of measurement data elements of the rotating body together with respective measuring times, determining at least one rotational speed or revolution period of the body for at least one point in time, and associating the obtained measurement data elements to respective rotary angles of the body based on the respective measuring times and the at least one rotational speed or revolution period of the body.