Capacitance Liquid Ingress Sensor to Avoid Electrode False Positives
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Solution Overview
Problem
Existing liquid detection sensors in vehicles are prone to false positives due to foreign matter adhering to electrodes, leading to unreliable detection of moisture ingress.
Innovation Solution
A liquid detection sensor that utilizes a change in electrostatic capacitance between an electrode inserted into a through-hole of a housing and the housing itself to reliably detect liquid ingress, with the electrode positioned to avoid interference with internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sheet-type water droplet sensor with electrodes is used to detect moisture ingress, then moisture detection capability is provided, but false positives occur when foreign matter adheres to the electrodes
Solution Approach 1:
The patent replaces the electrical resistance-based detection mechanism with an electrostatic capacitance-based mechanism. The sensor uses a pair of electrodes where capacitance changes when liquid ingress occurs, rather than measuring resistance changes. This substitution of the detection principle eliminates false positives caused by foreign matter adherence, as capacitance changes are more specific to liquid presence between the electrodes.
Solution Approach 2:
The patent changes the detection parameter from electrical resistance to electrostatic capacitance. By measuring capacitance changes between the electrodes rather than resistance changes, the system achieves more reliable liquid detection. The capacitance parameter is less susceptible to interference from foreign matter on the electrode surfaces, thereby improving both reliability and measurement precision.
2Reliability
If the electrode is inserted into the housing through-hole to detect liquid ingress, then detection capability is achieved, but the electrode may interfere with internal components
Solution Approach 1:
The patent applies local quality by positioning the electrodes in specific locations within the housing through-holes, away from critical internal components. The electrodes are strategically placed to detect liquid ingress without interfering with the operation of internal components such as the steering mechanism. This localized positioning ensures detection functionality while minimizing harmful interactions with other system elements.
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 provides reliable detection of liquid ingress by measuring changes in electrostatic capacitance, ensuring accurate detection of moisture or other liquids entering the housing.
Implementation Method 1
the liquid ingress into the housing is detected by a change in electrostatic capacitance of the electrode
Data Source
AI summary
A liquid detection sensor for detecting liquid ingress into a housing of a detection target device in which the housing is waterproofed, having an electrode configured to be inserted into a through-hole formed in the housing, and the liquid ingress into the housing is detected by a change in electrostatic capacitance of the electrode.