Magnetic Hot-Zone Sensor for Vehicle Component Detection

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Solution Overview

Problem

Inductive sensors in vehicle production plants, particularly in hot zones like dryers, are prone to faults, leading to laborious replacement and prolonged downtimes due to the need for cooling before maintenance, making reliable detection of vehicle components challenging.

Innovation Solution

A sensor device with a magnet element actuated by magnetic attraction, an electrical circuit that closes upon actuation, and a resetting mechanism, using samarium-cobalt magnets and high-temperature lines, ensures reliable and repeatable detection of vehicle components in high-temperature environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If inductive sensors are used in hot zones, then vehicle components can be detected, but the sensors are prone to faults and require laborious replacement with long downtimes

Engineering Contradiction:

Improvesensor reliabilityVSAvoiddowntime for replacement

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces inductive sensors with a magnetic field-based sensor system that uses a magnet element and magnetic field generator. This mechanical/magnetic field substitution eliminates the electrical components that are susceptible to hot zone damage, providing a sensor that can operate reliably in high-temperature environments without the same failure modes as inductive sensors.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the operating parameters of the sensor system by using magnetic field interaction instead of electrical induction. The magnet element is actuated by magnetic attraction forces from vehicle components, and the system operates based on magnetic field strength variations rather than electrical signals, allowing it to function in hot zones where traditional inductive sensors fail.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If inductive sensors are arranged in a dryer, then vehicle components can be detected in hot zones, but the dryer needs to be cooled down for sensor replacement

Engineering Contradiction:

Improvesensor deployment in hot zonesVSAvoidease of maintenance

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent replaces electrical inductive sensors with a magnetic field-based system that has no electrical components exposed to the hot zone. The magnet element and magnetic field generator are designed to withstand high temperatures, eliminating the need for cooling down the dryer before maintenance and greatly simplifying the replacement process.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If a magnet element is actuated by magnetic attraction, then reliable detection in hot zones is achieved, but the structure becomes more complex

Engineering Contradiction:

Improvedetection reliability in hot zonesVSAvoidsensor device structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the magnet element as a separate, movable component that is actuated by magnetic attraction from vehicle components. This extracted magnetic sensing mechanism is coupled with a magnetic field generator and an electrical circuit, but the core sensing function is separated into a distinct magnetic interaction system that is simpler and more reliable than full inductive sensor assemblies.

Inventive Principle:

Principle #2Taking out (Extraction)

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 reliable and efficient detection of vehicle components in hot zones with minimal downtime, allowing for easy maintenance and flexible deployment in vehicle production plants.

Implementation Method 1

the magnet element is actuated from its initial position into the deflected position in particular because of a magnetic attraction between the magnet element and the vehicle component approaching the magnet element

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Implementation Method 2

the electrical circuit is adapted to be closed when the magnet element is actuated from the initial position into the deflected position. In other words, the electrical circuit is closed as a consequence of the actuation of the magnet element

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12354460B2Sensor device for a hot zone of a vehicle production plant, and arrangement of a sensor device in a hot zone of a production plant for vehicles

Publication Date: 2025.07.08 BAYERISCHE MOTOREN WERKE AG

AI summary

A sensor device for a hot zone of a vehicle production plant includes a magnet element that is actuatable from an initial position into a deflected position when a vehicle component approaches the magnet element. An electrical circuit is open when the magnet element is arranged in the initial position and is closed when the magnet element is actuated from the initial position into the deflected position. An output element outputs a signal characterizing an ascertained approach of the vehicle component when the electrical circuit is closed.