Bidirectional Fan Alcohol Sensor with Heating Element
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Solution Overview
Problem
Existing alcohol sensing systems in vehicles often malfunction due to the presence of moisture and foreign substances, which can lead to inaccurate readings and system failures.
Innovation Solution
The system incorporates an air duct with a rotatable fan, a filter, and a moisture removal mechanism, allowing it to operate in both alcohol sensing and moisture removal modes, preventing the inflow of moisture and foreign substances through a filter and grille design, and utilizing a humidity sensor and heater to manage humidity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inlet of the air intake tube is fully opened to draw the driver's breath into the sensor, then the alcohol sensing capability is improved, but moisture and foreign substances can enter the inlet causing system malfunction
Solution Approach 1:
A heating element is introduced as an intermediary component between the air intake and the alcohol sensor. The heating element pre-heats the incoming air to evaporate moisture and volatile foreign substances before they reach the sensor, thereby maintaining both sensing capability and system reliability
Solution Approach 2:
The temperature parameter of the incoming air is changed by applying heat through the heating element. This temperature increase causes moisture and volatile substances to evaporate, preventing them from interfering with the alcohol sensing measurement while maintaining the inlet open for breath sampling
2Reliability
If a filter is added to block moisture and foreign substances, then system reliability is improved, but device complexity increases
Solution Approach 1:
The harmful moisture and foreign substances are extracted from the air stream through evaporation caused by the heating element, separating them from the breathable air that needs to reach the sensor. This extraction approach avoids adding complex mechanical filters while maintaining system reliability
3Adaptability or versatility
If the fan is made rotatable in opposite directions for moisture removal mode, then versatility is improved, but device complexity increases
Solution Approach 1:
The fan is designed with multi-functionality to operate in both normal sensing mode and moisture removal mode by rotating in opposite directions. This single component performs multiple functions, improving system versatility without requiring separate fans for each mode, thereby limiting the increase in device complexity
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 design significantly reduces system malfunctions by effectively filtering out moisture and foreign substances, ensuring accurate alcohol content measurement and maintaining system reliability.
Implementation Method 1
a heating element provided in the air duct and configured to heat the air passing through the air duct
Implementation Method 2
a bidirectional fan disposed in the sensor module and configured to rotate in a first direction to move air from the first opening to the second opening through the air duct
Data Source
AI summary
An embodiment alcohol sensing system includes an air duct including a first opening and a second opening, the first opening being opened to an outside of the air duct, and a sensor module connected to the air duct at the second opening, the sensor module including a fan configured to rotate in opposite directions and an alcohol sensor configured to measure an alcohol content in air.