Vehicle Air Conditioner Dehumidifying Control
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Solution Overview
Problem
Vehicle air conditioners in hybrid and electric cars face challenges in maintaining temperature consistency between the radiator and heat absorber in dehumidifying and heating modes, especially in specific environmental conditions, leading to inefficiencies in dehumidifying and heating the vehicle interior.
Innovation Solution
The system incorporates a control mechanism that adjusts the air volume of the outdoor blower and the valve position of the outdoor expansion valve to optimize refrigerant flow and heat exchange, allowing for effective temperature regulation by decreasing or increasing blower air volume based on the temperature of the heat absorber and radiator, thereby enhancing the dehumidifying and heating mode's operational range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the valve position of the outdoor expansion valve is limited to the lowest limit in dehumidifying and heating mode, then the refrigerant flow to the outdoor heat exchanger is maximized, but the temperature of the heat absorber still cannot reach the target value in outdoor air temperatures from +15°C to +20°C
Solution Approach 1:
The patent applies dynamics by making the outdoor blower's air volume adjustable based on operating conditions. The control unit dynamically changes the air volume of the outdoor blower during dehumidifying and heating mode to optimize heat exchange efficiency, allowing the system to adapt to different outdoor temperatures and maintain heat absorber temperature within the target range across a broader environmental range.
Solution Approach 2:
The patent changes the parameter of outdoor blower air volume to resolve the temperature consistency issue. By adjusting the air volume parameter of the outdoor blower in addition to the expansion valve position, the system can control the heat exchange rate between the refrigerant and outdoor air, thereby achieving better temperature control in the heat absorber across varying outdoor conditions.
2Temperature
If the air volume of the outdoor blower is increased to improve heat exchange, then the heat absorber temperature can be reduced, but the temperature consistency between radiator and heat absorber deteriorates
Solution Approach 1:
The patent implements feedback control by continuously monitoring both the heat absorber temperature and radiator temperature, and using this information to adjust the outdoor blower's air volume. The control unit compares the actual temperatures with target values and dynamically adjusts the blower operation to maintain temperature consistency while achieving the desired heat absorber temperature.
3Stability of the object's composition
If the system operates in internal cycle mode to maintain temperature consistency, then the temperature control is improved, but the refrigerant amount in the refrigerant circuit must be precisely managed increasing system complexity
Solution Approach 1:
The patent applies universality by enabling the outdoor heat exchanger to serve dual functions: as a condenser in cooling modes and as an evaporator in heating modes. This multi-functionality allows the system to maintain temperature consistency through outdoor heat exchange without requiring separate internal cycle configurations, thereby reducing refrigerant circuit management complexity while achieving stable temperature control.
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
This solution enlarges the effective range of the dehumidifying and heating mode, ensuring smooth air conditioning across a broader range of environmental conditions by adjusting blower air volume and valve positions, thus maintaining optimal interior temperatures.
Implementation Method 1
a radiator disposed in a vehicle interior to let the refrigerant radiate heat
Implementation Method 2
a heat absorber disposed in the vehicle interior to let the refrigerant absorb heat
Implementation Method 3
an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant radiate or absorb heat
Implementation Method 4
an expansion valve to decompress the refrigerant flowing into the outdoor heat exchanger
Implementation Method 5
an electric compressor to compress and discharge a refrigerant
Data Source
AI summary
There is disclosed a vehicle air conditioner which is capable of enlarging an effective range of a dehumidifying and heating mode to environmental conditions and smoothly dehumidifying and heating a vehicle interior. A vehicle air conditioner 1 executes a dehumidifying and heating mode in which a controller lets a refrigerant discharged from a compressor 2 radiate heat in a radiator 4, and decompresses the refrigerant by which heat has been radiated and then lets the refrigerant absorb heat in a heat absorber 9 and an outdoor heat exchanger 7, the controller decreases an outdoor blower voltage FANVout of an outdoor blower 15 and decreases an air volume into the outdoor blower 15 in a case where a temperature Te of the heat absorber 9 is high even when the controller adjusts a valve position of an outdoor expansion valve 6 into a lower limit of controlling in a situation in which a temperature TCI of the radiator 4 is satisfactory.