Vehicle HVAC Intake Control for Moisture Wall Airflow Loss
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Solution Overview
Problem
Conventional vehicular air conditioning systems face a decrease in air introduction amount due to intake ventilation resistance caused by moisture inflow blocking walls, leading to variations in temperature and deterioration of cooling and heating performance in the vehicle interior.
Innovation Solution
A vehicular air conditioning system with a control part that adjusts the rotational speed of the blower to compensate for the intake ventilation resistance by increasing the blower speed in the outdoor air mode, using PWM duty ratio tables to manage different rotational speeds based on intake modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moisture inflow blocking walls are installed on the cowl top around the air inlet to restrict moisture movement, then moisture contamination and failure of the intake part are prevented, but the air introduction amount is significantly reduced due to intake ventilation resistance
Solution Approach 1:
The control part changes the rotational speed parameter of the blower based on air intake mode. In outdoor air mode, the blower rotational speed is increased to compensate for the reduced air introduction amount caused by the moisture inflow blocking walls, while in other modes the normal rotational speed is maintained.
2Temperature
If the blower rotational speed is increased in outdoor air mode to compensate for reduced air introduction, then air discharge temperature consistency is maintained, but energy consumption increases
Solution Approach 1:
The blower rotational speed is made dynamic rather than fixed. The control part adjusts the rotational speed based on the air intake mode, increasing it only when necessary (in outdoor air mode) to maintain air discharge temperature consistency, and reducing it in other modes to save energy.
3Volume of moving object
If the intake part is disposed on the engine room side to secure vehicle interior space, then vehicle interior space is maximized, but the outdoor air inlet structure requires upward facing which easily introduces foreign substances such as moisture and dust
Solution Approach 1:
Moisture inflow blocking walls are introduced as an intermediary structure on the cowl top around the outdoor air inlet. These blocking walls restrict the movement of moisture toward the air inlet while allowing air to pass through, thereby preventing moisture contamination without compromising the engine room side disposal of the intake part.
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 system effectively maintains consistent air discharge temperature and performance by compensating for the reduced air introduction due to moisture inflow blocking walls, preventing variations in temperature and improving interior comfort.
Implementation Method 1
a blower configured to suck the indoor air or the outdoor air through the indoor air inlet or the outdoor air inlet and blow the indoor air or the outdoor air into a vehicle interior
Data Source
AI summary
A vehicular air conditioning system includes: an intake part including an intake door configured to open an outdoor air inlet to introduce an outdoor air in an outdoor air mode, open an indoor air inlet to introduce an indoor air in an indoor air mode, and control an opening degree of the outdoor air inlet or the indoor air inlet, and a blower configured to suck the indoor air or the outdoor air through the indoor air inlet or the outdoor air inlet and blow the indoor air or the outdoor air into a vehicle interior; and a control part configured to control a rotational speed of the blower according to an air flow rate level of the air conditioning system.