Vehicle Lighting Dew Point Control for Frost Prevention
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Solution Overview
Problem
Existing vehicle lighting and signalling systems are ineffective in preventing mist and frost formation on outer lenses due to reliance on visual sensors that detect frost after its appearance and ineffective temperature thresholds for liquid condensation, leading to inadequate prevention and increased energy consumption.
Innovation Solution
A device that determines dew point temperature by measuring internal temperature and relative humidity, using this information to control heating systems to prevent mist and frost formation, anticipating future condensation risks, and optimizing heating power based on external temperature trends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a visual sensor is used to detect frost, then frost detection capability is provided, but the system can only detect frost after it appears and cannot prevent its formation
Solution Approach 1:
The patent applies preliminary action by using temperature and humidity sensors to detect conditions before frost or mist forms. The system calculates dew point temperature and compares it with the outer lens temperature to predict condensation risk in advance, activating heating means preventively rather than reacting after frost appears.
Solution Approach 2:
The system implements feedback by continuously monitoring temperature and humidity inside the lighting system, calculating dew point temperature, comparing it with outer lens temperature, and adjusting heating means activation accordingly. This closed-loop control enables real-time prevention of condensation.
2Ease of operation
If a predetermined temperature threshold is used to detect mist, then temperature-based detection is provided, but the detection is ineffective because liquid condensation appears at different temperatures depending on environmental conditions
Solution Approach 1:
The patent changes the detection parameter from a fixed temperature threshold to a dynamic dew point temperature calculation based on both temperature and relative humidity. This allows the detection threshold to adapt to varying environmental conditions, accurately predicting when condensation will occur regardless of ambient temperature variations.
3Object-generated harmful factors
If heating means are activated based on visual sensor detection, then de-icing function is provided, but the system cannot prevent misting up and activates heating too late
Solution Approach 1:
The system performs preliminary action by calculating dew point temperature from current temperature and humidity measurements, comparing it with the outer lens temperature, and activating heating means before mist or frost actually forms. This preventive approach eliminates the time delay inherent in visual detection methods.
4Reliability
If heating means are activated frequently to prevent condensation, then condensation prevention is improved, but energy consumption increases
Solution Approach 1:
The system uses feedback control by continuously monitoring temperature and humidity, calculating dew point temperature, comparing it with outer lens temperature, and adjusting heating activation accordingly. Heating is activated only when the dew point temperature approaches or exceeds the outer lens temperature, optimizing energy usage while maintaining reliable condensation prevention.
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
Effectively prevents mist and frost on vehicle lenses, ensuring consistent visibility and optimized energy usage by proactively managing heating to anticipate and prevent condensation, rather than reacting to its occurrence.
Implementation Method 1
The at least one heating means are adapted to heat the air inside the device and/or to heat directly at least one wall of the device
Implementation Method 2
the temperature at which the water vapor in the mass of air inside the system will liquefy when it is cooled at the level of the outer lens, thus forming mist on the inside of the outer lens
Data Source
AI summary
A device for controlling a lighting and/or signaling system of a vehicle that includes a controller adapted to determine a dew point temperature value inside the system from at least one value of the temperature inside the system and at least one value of the relative humidity inside the system.