Vehicle Air Conditioner Dynamic Mode Switching for Ram Pressure
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Solution Overview
Problem
Conventional vehicle air conditioners concentrate air conditioning power on occupied seats excessively, leading to passenger discomfort and inefficient power usage, especially when vehicle speed increases and outside air is introduced.
Innovation Solution
An air conditioner with a mode-switching mechanism that adjusts air conditioning capacity based on vehicle speed and pressure, allowing for dynamic distribution of air conditioning capability between specific and non-specific regions, including adjusting flow and temperature, to maintain passenger comfort while saving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If air conditioning power is concentrated on occupied seats to save power, then power consumption is reduced, but passenger comfort deteriorates due to excessive concentration on specific passengers
Solution Approach 1:
The air conditioning system dynamically adjusts the distribution of conditioned air based on real-time detection of vehicle speed and ram pressure. The control unit modifies blowing amounts to specific air outlets according to changing external conditions, transitioning from static to dynamic control to balance power saving with comfort maintenance.
Solution Approach 2:
The system incorporates feedback mechanisms by detecting vehicle speed and ram pressure, then using this information to adjust the air conditioning distribution. The control unit continuously monitors external conditions and modifies the blowing amounts accordingly, creating a closed-loop control system that responds to environmental changes.
2Quantity of substance
If outside air is introduced at high vehicle speed, then fresh air supply is improved, but air conditioning power is excessively concentrated on specific seats due to increased ram pressure
Solution Approach 1:
The system creates a compensated air distribution pattern that copies the natural ram pressure effect while adjusting for fairness. Instead of allowing uncontrolled concentration, the control unit calculates appropriate blowing amounts for each air outlet based on detected ram pressure, creating a balanced distribution that maintains fresh air supply while preventing excessive concentration on specific seats.
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 solution effectively reduces passenger discomfort by dynamically adjusting air conditioning capacity and power usage, ensuring comfort and efficiency across varying conditions.
Implementation Method 1
a pressure of air drawn into the blower
Implementation Method 2
air conditioning of a specific region including a driver seat
Implementation Method 3
air conditioning of a non-specific region not including the specific region
Data Source
AI summary
A vehicle air conditioner includes a blower for blowing air into a space of a vehicle compartment, and an air-conditioning mode switching portion for switching between air conditioning modes. The air conditioning modes include a normal air conditioning mode in which air conditioning of a specific region including a driver seat and air conditioning of a non-specific region not including the specific region in the space of the vehicle compartment are performed, and a specific-region prioritizing air conditioning mode in which an air conditioning capability for the non-specific region is decreased as compared to the normal air conditioning mode. The air-conditioning mode switching portion adjusts the air conditioning capability for the non-specific region based on a pressure of air drawn into the blower, in the specific-region prioritizing air conditioning mode.