Capacitive Wheel Arch Wetness Detection Without Movable Sensors
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Solution Overview
Problem
Existing wheel arch wetness detection systems are vulnerable to mechanical stress, have limited measurement range, and require complex calculation models due to movable sensor membranes.
Innovation Solution
A capacitive moisture sensor with parallel, electrically insulated electrodes on a carrier element, aligned in a rising manner, is used to detect wetness without movable parts, ensuring reliable detection across a wide range of speeds and reducing mechanical damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If movable sensor membranes with piezoceramics are used on the wheel side, then wetness detection is possible, but the sensor is vulnerable to mechanical stress such as stone chippings
Solution Approach 1:
The patent replaces the mechanical piezoceramic sensor membrane with a capacitive sensor system consisting of two electrically insulated electrodes. This substitution eliminates the movable mechanical structure that was vulnerable to stone chippings, while maintaining the ability to detect wetness through capacitance changes caused by water presence between the electrodes.
Solution Approach 2:
The patent uses a thin, flexible carrier element to hold the two electrodes in close proximity. This thin-film structure allows the sensor to conform to the wheel arch surface while being protected from mechanical damage, as the flexible carrier can absorb impacts without damaging the electrodes.
2Measurement precision
If sensor membranes are placed in a particular position, then measurement is possible at that location, but the measurement range is limited to a small area
Solution Approach 1:
The patent divides the measurement function into two electrically insulated electrodes that can be arranged in different configurations. By segmenting the sensor into multiple electrode pairs with different orientations and positions, the system can detect wetness across a larger area of the wheel arch while maintaining precise measurement capability at each location.
Solution Approach 2:
The patent extends the measurement capability from a single point to a two-dimensional area by arranging electrodes in multiple orientations (longitudinal and transverse directions). This dimensional expansion allows the sensor to detect wetness patterns across the entire wheel arch surface, not just at a single predetermined position.
3Measurement precision
If movable sensor membranes are used, then wetness detection is possible, but complex calculation models are required to interpret sensor movements
Solution Approach 1:
The patent replaces the mechanical movement-based sensing principle with a capacitive sensing principle. Instead of measuring physical displacement of a membrane, the system directly measures capacitance changes caused by the dielectric properties of water. This substitution simplifies the evaluation from complex mechanical movement analysis to straightforward capacitance comparison with reference values.
Solution Approach 2:
The patent changes the measurement parameter from mechanical displacement to electrical capacitance. By measuring the capacitance between two electrodes that changes when water comes into contact with them, the system obtains direct wetness information without requiring complex calculation models to interpret mechanical sensor movements.
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 system provides reliable wetness detection across various heights and speeds, minimizing mechanical damage and simplifying calculations, while being adaptable to different vehicle wheel arches.
Implementation Method 1
the sensor arrangement has at least one capacitive moisture sensor with two electrodes, insulated electrically with respect to one another
Data Source
AI summary
A device for the detection of wetness in wheel arches of road vehicles includes at least one sensor arrangement including at least one capacitive moisture sensor with two electrodes, electrically insulated with respect to one another, and with at least one evaluation unit, the electrodes, electrically insulated with respect to one another, are arranged on a carrier element, that the electrodes, electrically insulated with respect to one another, are formed by two detection sections arranged parallel to one another, and that the detection sections, when used as intended, are aligned respectively in a rising manner in their longitudinal extent. The device also relates to a road vehicle for the detection of wetness, with at least one wheel arch, with which provision is made according to the invention that the wheel arch is delimited by a wheel-housing shell, at which a device according to the invention is arranged.