Control means for the compressor of a vehicle air conditioner based on target high pressure
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Solution Overview
Problem
Conventional vehicle air conditioners face challenges in maintaining a consistent radiator temperature due to varying refrigerant subcool degrees, leading to discomfort and inefficient heating performance.
Innovation Solution
The air conditioner system includes control means that adjust the compressor and expansion valve operations based on refrigerant subcool degree, using indexes like air temperature, passing air volume, and refrigerant circulation amount to maintain a target high pressure, thereby controlling the subcool degree and ensuring a desirable outlet temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the refrigerant subcool degree is increased to improve heating capability, then the heating performance is enhanced, but the radiator temperature becomes uneven causing discomfort
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the target high pressure based on the refrigerant subcool degree. When subcool degree increases, the target high pressure is increased accordingly, which maintains the relationship between pressure and temperature to ensure uniform radiator temperature distribution while preserving heating capability.
2Power
If the refrigerant subcool degree is increased to improve heating capability, then the heating performance is enhanced, but the outlet temperature cannot be achieved when target high pressure is not adjusted
Solution Approach 1:
The patent changes the target high pressure parameter in response to refrigerant subcool degree variations. By increasing the target high pressure when subcool degree increases, the system maintains the necessary temperature conditions to achieve the desired outlet temperature while preserving enhanced heating capability.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the refrigerant subcool degree and adjusting the target high pressure accordingly. This closed-loop control ensures that the outlet temperature is maintained at the desired level even when heating capability is enhanced through increased subcool degree.
3Temperature
If the target high pressure is increased to maintain outlet temperature, then the outlet temperature is achieved, but the heating capability is reduced
Solution Approach 1:
The patent coordinates changes in both target high pressure and refrigerant subcool degree. By increasing target high pressure while simultaneously allowing increased subcool degree, the system maintains heating capability while achieving the required outlet temperature, resolving the trade-off between these two parameters.
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 approach allows for consistent and comfortable air conditioning by regulating the refrigerant subcool degree and target high pressure, enhancing heating capability and temperature stability within the vehicle.
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
an outdoor heat exchanger disposed outside the vehicle interior to let the refrigerant absorb heat
Implementation Method 4
an expansion valve which decompresses the refrigerant flowing into the outdoor heat exchanger
Data Source
AI summary
There is disclosed a vehicle air conditioner which can realize a desirable outlet temperature even when a refrigerant subcool degree of a radiator varies. A controller executes a heating mode to let a refrigerant discharged from a compressor 2 radiate heat in a radiator 4, decompress the refrigerant by which heat has been radiated, and then let the refrigerant absorb heat in an outdoor heat exchanger 7, thereby heating the vehicle interior. The controller controls the compressor 2 on the basis of a radiator target pressure, and corrects the radiator target pressure in such a direction as to heighten when a target subcool degree enlarges, on the basis of the target subcool degree (the refrigerant subcool degree) of the radiator 4.