Vehicle Air Conditioning Recirculation Control for Fogging and Range
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Solution Overview
Problem
Existing vehicle air conditioning systems in electric vehicles face challenges in optimizing internal circulation ratios, leading to increased battery power consumption, reduced all-electric range, and potential fogging issues due to uncontrolled air inflow, which affects vehicle safety and comfort.
Innovation Solution
A system and method that uses sensors to determine the number of occupants and adjust the internal circulation ratio based on sound intensity and duration, as well as conversation situations, to optimize air quality and reduce fogging risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the internal circulation ratio is increased to reduce battery power consumption and extend all-electric range, then energy efficiency is improved, but the risk of fogging increases and air quality deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the internal circulation ratio based on real-time detection of conversation conditions. The system transitions from a fixed ratio to a variable ratio that adapts to changing environmental conditions, specifically increasing fresh air intake when conversation duration or intensity exceeds thresholds to prevent fogging while maintaining energy efficiency during normal conditions
Solution Approach 2:
The system uses microphones to detect conversation sound levels and duration, then feeds this information back to the air conditioning control unit. This feedback mechanism enables the system to automatically adjust the internal circulation ratio based on actual conversation conditions, creating a closed-loop control that balances energy efficiency with fogging prevention
2Device complexity
If the internal circulation ratio is fixed to simplify control, then device complexity is reduced, but adaptability to various conversation situations is worsened
Solution Approach 1:
The system employs automated detection and control where the air conditioning control unit independently monitors conversation conditions through microphones and automatically adjusts the internal circulation ratio without requiring manual intervention. This self-service approach maintains simplicity while achieving adaptability to varying conversation situations
Data Source
AI summary
A system includes a plurality of sensors configured to sense an opening/closing of a door, fastening/unfastening of a seat safety belt, and change in a vehicle height; a first processor configured to determine the number of all occupants in the vehicle by the opening/closing of the door, the fastening/unfastening of the seat safety belt, and the change in the vehicle height sensed by the plurality of sensors and preliminarily determine an internal circulation ratio of the air conditioning system according to the determined number of all occupants in the vehicle; a second processor configured to adjust the internal circulation ratio which is preliminarily determined by the first processor according to at least one of a sound intensity and a sound duration time in the vehicle; and a controller configured to control the air conditioning system according to the adjusted internal circulation ratio.