Hydrant Valve Opening Detection Using Gyroscope Sensors

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Solution Overview

Problem

Fire hydrants lack visual indicators for determining the open position of their valves, and existing sensor devices are prone to malfunction and have high repair costs.

Innovation Solution

A sensor device with a gyroscope sensor and optional magnetic field sensor is used to detect the rotation rate and distance changes of the valve's operating device, allowing accurate determination of the opening degree, and includes features like a battery-powered evaluation unit and wireless communication for low complexity and ease of installation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing sensor devices are used to determine valve opening degree, then measurement capability is provided, but device complexity and repair costs increase

Engineering Contradiction:
Improvevalve opening degree determinationVSAvoidsensor device complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical sensor devices with a simple rotational sensor (such as a gyroscope or angular position sensor) that directly measures the rotation angle of the operating device. This substitution reduces mechanical complexity while maintaining measurement precision for determining valve opening degree.

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

2Ease of operation

If visual indicators are added to hydrants, then ease of determining open position is improved, but device complexity increases

Engineering Contradiction:
Improvedetermination of open positionVSAvoidhydrant structure complexity
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The patent introduces an intermediary evaluation unit that processes sensor data and provides information about valve opening status. This intermediary layer translates complex sensor measurements into simple, easily interpretable indicators (such as LED signals or wireless notifications), improving ease of operation without adding complex visual mechanical indicators to the hydrant structure.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Measurement precision

If complex sensor devices are installed, then measurement accuracy is improved, but ease of repair deteriorates

Engineering Contradiction:
Improveopening degree detection accuracyVSAvoidsensor device repairability
Core Design Contradiction:
Measurement precisionVSEase of repair

Solution Approach 1:

The patent segments the sensor system into modular components: a simple rotational sensor, an evaluation unit, and a communication interface. This segmentation allows the critical measurement function to be performed by a simple, easily replaceable sensor, while the evaluation unit handles complex processing. If repair is needed, only the simple sensor needs to be replaced, improving ease of repair while maintaining measurement accuracy.

Inventive Principle:
Principle #1Segmentation

4Reliability

If continuous monitoring is implemented, then reliability of valve status determination is improved, but energy consumption increases

Engineering Contradiction:
Improvevalve status monitoring reliabilityVSAvoidsensor device energy consumption
Core Design Contradiction:
ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic monitoring instead of continuous monitoring, where the rotational sensor and evaluation unit check valve status at regular intervals or when triggered by specific events (such as attempted operation). This periodic action maintains reliability for detecting valve status changes while significantly reducing energy consumption compared to continuous monitoring.

Inventive Principle:
Principle #19Periodic action

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

The sensor device provides reliable and accurate determination of the valve opening with low complexity and cost, enabling easy retrofitting and reducing energy consumption.

Implementation Method 1

at least one rotation rate sensor, for example a gyroscope sensor

Methodology Applied
Scientific EffectGyroscope: Gyroscope

Implementation Method 2

at least one magnetic field sensor and at least one permanent magnet interacting with one another

Methodology Applied
Scientific EffectMagnetic field interaction: Magnetic Field

Data Source

PatentEP4647559A1Sensor device and method for determining an opening degree of a valve of a fitting, and fitting
Publication Date: 2025.11.12 DUKER GMBH
  • EP4647559A1 patent drawingFigure 1
  • EP4647559A1 patent drawingFigure 2
  • EP4647559A1 patent drawingFigure 3

AI summary

The invention relates to a sensor device (4) for determining the degree of opening of a valve (2) of a fitting (1), in particular a hydrant, with at least one rotation rate sensor (10), for example a gyroscope sensor, wherein the fitting (1) has an operating device (3) rotatable about a rotation axis (9) between a closed position and an open position, in particular comprising a rotatable spindle (7), for the valve (2), wherein the at least one rotation rate sensor (10) can be arranged in and/or on the operating device (3) such that, in an arranged state, when the operating device (3) is actuated by rotating about the rotation axis (9), at least one movement signal can be detected by the at least one rotation rate sensor (10), wherein the degree of opening of the valve (2) can be determined based on the at least one movement signal.Furthermore, a fitting (1) and a method for determining the degree of opening of a valve (2) of a fitting (1) are claimed.