Cabin Air Filtration Control for Fresh-Recirculated Air Balance
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Solution Overview
Problem
Existing cabin air filtration systems in vehicles face challenges in maintaining air quality with minimal energy consumption, particularly in managing the ratio of fresh and recirculated air while balancing noise levels, humidity, and fogging issues, which often result in high energy consumption and compromised air quality.
Innovation Solution
A method for operating a cabin air filtration system that adjusts the ratio of fresh and recirculated air based on vehicle speed, air flow magnitude, and global filtration efficiency, using system information to determine the optimal recirculation ratio for achieving the required vehicle filtration efficiency while minimizing energy consumption and ensuring air quality, utilizing a computer program and electronic control unit to manage the air filtration system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If maximum air flow is used to manage humidity and prevent fogging after cold start, then air quality and defogging performance are improved, but noise levels increase significantly
Solution Approach 1:
The system dynamically adjusts the air flow magnitude and recirculation ratio based on operating conditions. After cold start, maximum air flow is used for defogging, but during cruising, the air flow is limited to around 50% of maximum. The recirculation ratio is continuously adjusted between 100% fresh air and 100% recirculated air modes based on humidity levels, temperature, and driving conditions, resolving the contradiction between defogging performance and noise levels.
2Use of energy by moving object
If 100% recirculated air mode is used to reduce energy consumption, then energy efficiency is improved, but air quality deteriorates due to accumulated contaminants
Solution Approach 1:
The system changes the recirculation ratio parameter dynamically based on multiple factors including humidity levels, temperature, vehicle speed, and time since cold start. The control unit adjusts the recirculation ratio between 0% and 100% recirculated air, allowing the system to operate in 100% recirculation mode during stable cruising conditions to save energy, while switching to higher fresh air intake when contaminants accumulate or environmental conditions change, thus resolving the contradiction between energy efficiency and air quality.
3Object-affected harmful factors
If fresh air intake is increased to improve air quality, then air quality is improved, but energy consumption increases due to air conditioning requirements
Solution Approach 1:
The system uses partial recirculation rather than complete fresh air intake or complete recirculation. By maintaining a balanced recirculation ratio that incorporates both fresh air for quality and recirculated air for energy efficiency, the system achieves acceptable air quality while minimizing the energy burden of air conditioning. The control unit optimizes this balance based on environmental conditions, cabin occupancy, and thermal loads.
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
The method ensures efficient air quality maintenance within the vehicle cabin with reduced energy consumption by optimizing the recirculation ratio of fresh and recirculated air, balancing air quality and energy efficiency, and extending filter lifetime, while prioritizing safety functions like defogging and defrosting.
Implementation Method 1
an air filter device for filtering an air flow into the cabin
Data Source
AI summary
A method for operating a cabin air filtration system of a vehicle includes A) providing system information, B) providing a required vehicle filtration efficiency, and C) determining, from the system information for the vehicle, speed and a current magnitude of an air flow, a recirculation ratio of fresh air and recirculated air, such that a global filtration efficiency corresponds to the required vehicle filtration efficiency provided in step B).