Vehicle Air Atomizer Conductivity Control for Liquid Quality
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Solution Overview
Problem
Existing air-cooling devices for motor vehicles using nebulization can refresh the passenger compartment with deteriorated or biological contaminants in the nebulization liquid, leading to undesirable inhalation and unpleasant odors.
Innovation Solution
An air-cooling device equipped with a conductivity cell and a double H half-bridge circuitry that measures the impedance of the nebulization liquid, using an operational amplifier to determine its conductivity and quality, and a voltage comparator to control the nebulization process, ensuring it stops when the liquid is of poor quality or depleted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nebulization device operates continuously without monitoring, then the cooling function is maintained, but the nebulization liquid may deteriorate and release biological contaminants or unpleasant odors
Solution Approach 1:
The patent implements a feedback mechanism where the conductivity cell continuously monitors the nebulization liquid quality, and the control unit adjusts the nebulization operation based on the measured conductivity values. When the liquid quality deteriorates (conductivity exceeds threshold), the system automatically stops nebulization to prevent contamination, thus resolving the contradiction between maintaining reliability and avoiding complex monitoring systems.
Solution Approach 2:
The system performs self-monitoring and self-regulation through the conductivity cell and control unit, which automatically detect liquid deterioration and stop the nebulization process without external intervention. This self-service approach maintains reliability while keeping the device complexity manageable by using simple conductivity-based detection rather than complex analytical instruments.
2Reliability
If a conductivity monitoring system is added to the nebulization device, then the quality control of nebulization liquid is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the quality monitoring function into a separate, dedicated conductivity cell and control unit, independent from the main nebulization system. This modular extraction allows the monitoring function to be implemented with simple, dedicated components rather than integrating complex monitoring into the existing nebulization circuitry, thus improving reliability while minimizing the increase in overall device complexity.
Solution Approach 2:
The system monitors liquid quality through changes in electrical conductivity parameter, which is a simple, easily measurable property that requires minimal complex circuitry. By focusing on this single electrical parameter rather than multiple chemical or physical properties, the patent achieves reliable quality detection with relatively simple electrical components.
3Productivity
If the nebulization liquid is used until depletion, then the productivity is maximized, but the liquid quality deteriorates and may cause harmful effects
Solution Approach 1:
The conductivity monitoring system performs preliminary detection of liquid quality deterioration before the liquid is completely depleted. By detecting changes in conductivity that indicate contamination or degradation, the system stops nebulization in advance, preventing the release of harmful biological contaminants while still maximizing the usable duration of the liquid.
Solution Approach 2:
The continuous feedback from the conductivity cell allows the system to monitor liquid quality throughout its usage lifecycle and stop nebulization at the optimal moment when quality deteriorates but before harmful contaminants are released. This feedback mechanism balances productivity maximization with harmful factor 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 the diffusion of poor-quality or contaminated nebulization liquid into the vehicle, ensuring a safer and more pleasant environment by monitoring and controlling the nebulization process based on conductivity levels.
Implementation Method 1
a conductivity cell comprising two electrodes arranged in said nebulization unit and allowing impedance measurement
Implementation Method 2
make it possible to measure an impedance of the nebulization liquid via the output voltage of the operational amplifier and to deduce the conductivity of the nebulization liquid
Data Source
Figure 1
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AI summary
The present invention relates to a device for freshening air by atomization (1) for a motor vehicle (V). The invention is characterised in that the air freshening device (1) comprises: an atomization unit (10) suitable for receiving an atomization liquid (L); an atomizer (20) coupled to said atomization unit (10); a conductivity cell (30) which comprises two electrodes (E1, E2) arranged in said atomization unit (10) and enables an impedance (R1) to be measured; an H-shaped double half bridge (40) consisting of a plurality of transistors (S1, S2, S3, S4) and connected to said conductivity cell (20), said H-shaped double half bridge (40) being suitable for supplying said conductivity cell (30) with an alternating power supply current (i); and an operational amplifier (50) connected to said H-shaped double half bridge (40) and comprising an input voltage (Vref), said operational amplifier (50) being suitable for providing an output voltage (Vout) depending on said input voltage (Vref) and said impedance (R1).