Controller Housing Leak Detection Using Humidity Dynamics
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Solution Overview
Problem
Existing moisture sensors in vehicle electronics fail to reliably detect defects in housings due to temperature inhomogeneity, leading to unreliable detection of condensation and potential damage from moisture ingress.
Innovation Solution
A method and apparatus that utilize sensors to detect a first characteristic variable of humidity within the housing, determine a parameter based on its dynamics, and compare it against predetermined thresholds to reliably identify defects, such as leaks, by considering the housing's specific time constants and external humidity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moisture sensors are used to detect condensation based on relative humidity, then condensation detection is enabled, but detection reliability deteriorates due to temperature inhomogeneity within the housing
Solution Approach 1:
The patent transitions from static humidity threshold comparison to dynamic humidity change rate monitoring. By evaluating the rate of change of humidity (first derivative with respect to time) and acceleration of change (second derivative), the system detects defects based on abnormal humidity dynamics rather than absolute humidity values, resolving the reliability issue caused by temperature inhomogeneity
Solution Approach 2:
The patent changes the evaluation parameter from absolute relative humidity to the rate of change of humidity (ΔRH/Δt). This parameter transformation allows the system to detect defects through abnormal humidity dynamics while being insensitive to temperature-induced humidity variations, thereby improving detection reliability
2Ease of operation
If local humidity evaluation is performed at the sensor location, then condensation detection is simplified, but detection accuracy deteriorates due to local temperature variations
Solution Approach 1:
The patent maintains local sensor placement for simplicity but introduces dynamic evaluation of humidity change rates. By monitoring how quickly humidity changes rather than absolute humidity levels, the system achieves reliable defect detection while keeping the sensor placement and evaluation method simple
Solution Approach 2:
The system continuously monitors humidity changes over time and uses feedback from the rate of change to detect defects. The dynamic evaluation creates a feedback mechanism where abnormal humidity dynamics trigger defect detection, maintaining operational simplicity while improving reliability
3Device complexity
If humidity threshold comparison is used for defect detection, then detection process is simplified, but detection reliability deteriorates due to false positives from condensation
Solution Approach 1:
The patent replaces static threshold comparison with dynamic rate-of-change analysis. By evaluating the first and second derivatives of humidity with respect to time, the system distinguishes between normal condensation (gradual changes) and defects (rapid changes), improving reliability without significantly increasing system complexity
Solution Approach 2:
The patent transforms the detection parameter from absolute humidity to humidity change rate (ΔRH/Δt). This parameter change enables the system to differentiate between condensation and defects based on the speed of humidity change, reducing false positives while maintaining detection simplicity
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
This approach allows for early detection of housing defects, preventing water penetration and ensuring the safety and integrity of electronic components by triggering alerts or events when deviations from established humidity parameters are detected.
Implementation Method 1
capturing a first characteristic variable which characterizes a humidity, in particular relative humidity, inside the housing of the controller
Implementation Method 2
capturing a second characteristic variable which characterizes a humidity, in particular relative humidity, outside the housing of the controller
Data Source
AI summary
An apparatus and method for detecting a defect, in particular a leakage, of a housing of a controller includes (i) capturing a first characteristic variable, which characterizes a humidity within the housing, (ii) determining a parameter depending on the first characteristic variable, wherein the parameter characterizes a dynamic of the humidity within the housing, and (iii) comparing the parameter with at least one predetermined threshold value or one predetermined range of validity, wherein a defect of the housing is detected if the parameter exceeds or falls below the at least one threshold value or the range of validity. A vehicle including a controller having a housing and the apparatus is also disclosed.