Vehicle HVAC Airflow Door Layout for Quiet Recirculation Control
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Solution Overview
Problem
Existing HVAC units for vehicles lack efficient control over airflow modes, leading to suboptimal comfort and increased noise levels due to the inability to precisely manage external and internal airflows.
Innovation Solution
The proposed HVAC unit features a unique configuration of doors and apertures that allow for precise control of external and internal airflows, enabling various operating modes such as fresh air, partial-recirculation, recirculation, and ram air modes, while minimizing noise and optimizing airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional HVAC unit with simple door configuration is used, then the device complexity is low, but the airflow mode control precision is insufficient leading to suboptimal comfort and increased noise levels
Solution Approach 1:
The HVAC unit divides the airflow control into multiple independent segments: a first door for exterior airflow, a second door for first interior airflow, and a third door for second interior airflow. Each door can be independently controlled to achieve different airflow modes (fresh air, recirculation, partial-recirculation, ram air), providing precise control over air intake paths while maintaining manageable system complexity through modular design.
2Object-affected harmful factors
If the first door is made fully closed to prevent exterior airflow, then noise from external air intake is reduced, but fresh air supply is compromised
Solution Approach 1:
The first door incorporates selective permeability with openings that allow controlled passage of exterior airflow. When the first door is in the closed position, it does not completely block the first aperture but rather filters and regulates the exterior air intake locally, allowing fresh air supply to continue while reducing noise from uncontrolled external air entry.
3Adaptability or versatility
If multiple doors are added to control different airflow paths, then airflow mode versatility is improved, but the ease of operation decreases due to complex door coordination
Solution Approach 1:
Each door in the system is designed to perform multiple functions across different operating modes. The first door controls both fresh air intake and ram air modes; the second and third doors together manage recirculation and partial-recirculation modes. This multi-functionality allows a single door configuration to achieve versatile airflow control without requiring additional specialized components for each mode, simplifying the overall operation.
Data Source
AI summary
An HVAC unit including: a case defining a first aperture, a second aperture, a third aperture, and an outlet aperture, a first door rotatably attached to the case, a second door, rotatably attached to the case, and a third door rotatably attached to the case, with the first door being arranged to partially allow the exterior airflow in its closed position.