Vehicle Air Conditioner Mode Switching Through Heat-Balance Feedback
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Solution Overview
Problem
Conventional vehicle air conditioners fail to select and change operation modes optimally based on environmental conditions and set temperatures, leading to suboptimal air conditioning performance and discomfort inside the vehicle.
Innovation Solution
A vehicle air conditioner with a control system that dynamically switches between heating, dehumidifying, and cooling modes by monitoring heat absorption and radiation in the heat absorber and radiator, and adjusting the operation based on outdoor temperature and humidity, using a compressor, radiator, heat absorber, and outdoor heat exchanger, with a suction changing damper to optimize air flow and mode selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mode changing control based on outdoor air temperature and target outlet temperature is used, then the air conditioner can operate with basic heating, cooling, and dehumidifying functions, but the optimum operation mode is not necessarily selected leading to suboptimal air conditioning performance
Solution Approach 1:
The control means continuously monitors the actual heat absorption in the heat absorber and actual heat radiation in the radiator, comparing these with target values. Based on this feedback, the system dynamically adjusts operation modes (heating, dehumidifying and heating, cooling, dehumidifying and cooling) to maintain optimal air conditioning performance under varying environmental conditions.
Solution Approach 2:
The system transitions from static mode selection based solely on outdoor temperature and target outlet temperature to dynamic mode selection that continuously adapts to real-time heat absorption and radiation conditions. The control means can switch between multiple operation modes depending on the operational state of the heat absorber and radiator, enabling flexible adaptation to changing environmental conditions.
2Reliability
If the air conditioner uses fixed operation modes based on outdoor temperature and target outlet temperature, then the system structure remains simple, but desirable air conditioning performance cannot be achieved when unsuitable modes are selected
Solution Approach 1:
The control means incorporates feedback mechanisms that monitor actual heat absorption and radiation values, enabling intelligent decision-making for mode selection. This feedback-based control ensures optimal air conditioning performance by selecting appropriate operation modes based on real-time system state, rather than relying on predetermined fixed modes.
Solution Approach 2:
The control means autonomously determines the optimal operation mode by monitoring its own operational parameters (heat absorption in heat absorber, heat radiation in radiator) and environmental conditions. The system self-adjusts between heating, dehumidifying and heating, cooling, and dehumidifying and cooling modes without requiring external intervention, maintaining high performance while managing control complexity internally.
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 ensures accurate mode switching to achieve desirable air conditioning performance, maintaining a comfortable environment by optimizing heat management and air flow according to vehicle conditions and set temperatures.
Implementation Method 1
a compressor which compresses a refrigerant
Implementation Method 2
a radiator disposed in this air flow passage to let the refrigerant radiate heat
Implementation Method 3
a heat absorber disposed in this air flow passage to let the refrigerant absorb heat
Implementation Method 4
an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant radiate or absorb heat
Implementation Method 5
the refrigerant by which heat has been radiated is decompressed and then absorbs heat
Data Source
AI summary
A vehicle air conditioner is capable of selecting and changing an optimum operation mode so that a desirable air conditioning performance can be exerted on conditions such as an environment and a set temperature. A controller changes and executes at least one of a heating mode, a dehumidifying and heating mode, a dehumidifying and cooling mode, and a cooling mode. In the dehumidifying and heating mode, the controller shifts to the dehumidifying and cooling mode on the basis of a situation where heat absorption in a heat absorber (9) runs short or heat radiation in a radiator (4) becomes excessive, and also in this dehumidifying and cooling mode, the controller shifts to the dehumidifying and heating mode on the basis of a situation where the heat radiation in the radiator (4) runs short.