Vehicle Air Conditioning Flow Control for Stable Refrigerant Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional air conditioning systems for motor vehicles experience sudden changes in refrigerant flow rate when air conditioning units are turned on or off, leading to unstable temperatures and reduced cooling performance in passenger compartments, resulting in discomfort.
Innovation Solution
An air conditioning system with a flow rate control unit, including a microcomputer and opening/closing valves, that adjusts refrigerant flow rates by increasing or reducing refrigerant amounts in advance and controlling the operation of air conditioning units to prevent sudden changes, ensuring stable temperatures and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple air conditioning units are operated simultaneously, then the cooling coverage is improved, but the refrigerant flow rate becomes unstable
Solution Approach 1:
The control unit performs preliminary actions by adjusting the refrigerant flow rate to the air conditioning units before they are fully activated. When a new unit is to be turned on, the system pre-adjusts the refrigerant distribution to prevent sudden flow changes. Similarly, when a unit is turned off, the system preliminarily adjusts the refrigerant flow to the remaining units to maintain stability, avoiding temperature fluctuations and performance degradation.
2Productivity
If the refrigerant flow rate is increased to maintain cooling performance, then the cooling performance is improved, but the temperature stability deteriorates
Solution Approach 1:
The control unit continuously monitors the refrigerant flow rate and temperature conditions in each zone, and adjusts the refrigerant distribution accordingly. When a unit is activated or deactivated, the feedback mechanism detects the resulting flow rate changes and automatically adjusts the refrigerant allocation to maintain both cooling performance and temperature stability, preventing the harmful effects of sudden temperature changes.
Data Source
AI summary
An air conditioning system for motor vehicles includes a compressor, a condenser, a plurality of air conditioning units connected in parallel with each other with respect to the compressor and the condenser, and a flow rate control unit configured to, when a specific one of the air conditioning units is additionally turned on or is turned off, prevent occurrence of a sudden change in refrigerant amount in the remaining air conditioning units.