Air Conditioner Thermal Load Control for Stable Cabin Temperature
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Solution Overview
Problem
Conventional vehicular air conditioners experience uncontrollable temperature fluctuations due to engine speed variations, leading to inefficient cooling or heating and increased power consumption due to frequent on-off cycles of electric compressors.
Innovation Solution
An intelligent thermostatic control method and device that calculates the thermal load based on indoor, outdoor temperatures, sunlight intensity, and desired cooling/heating capacity, adjusting the compressor speed and fan operation to maintain optimal conditions while minimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional power on-off control is used for electric compressors, then temperature control simplicity is maintained, but power consumption increases and system overload occurs due to frequent starting and stopping
Solution Approach 1:
The patent applies dynamics by transitioning from static on-off control to dynamic frequency-based control. The electric compressor operates continuously with variable frequency, allowing the system to adapt to changing thermal loads without repeated starting and stopping, thereby reducing power consumption and avoiding system overload.
Solution Approach 2:
The patent implements continuity of useful action by maintaining continuous compressor operation at variable frequencies. Instead of intermittent on-off cycles, the compressor runs continuously with adjusted frequency to match thermal demand, eliminating the energy losses associated with repeated startup and ensuring stable temperature control.
2Power
If electric compressor frequency is increased to meet high thermal load, then cooling/heating capacity is sufficient, but power consumption increases
Solution Approach 1:
The system uses dynamic frequency adjustment of the electric compressor based on real-time thermal load conditions. The controller continuously monitors thermal load and adjusts compressor frequency accordingly, ensuring adequate cooling/heating capacity is provided only when necessary, thereby optimizing the balance between power output and energy consumption.
Solution Approach 2:
The patent changes the operational parameter of compressor frequency dynamically. By adjusting frequency as a variable parameter rather than maintaining fixed high capacity, the system provides sufficient cooling/heating power during high thermal load while reducing power consumption during lower demand periods.
3Measurement precision
If thermal load estimation is implemented with multiple sensors and calculations, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The controller performs multiple functions using a single integrated unit. It simultaneously executes thermal load estimation, frequency calculation, and compressor control, eliminating the need for separate dedicated devices for each function. This multi-functionality achieves precise temperature control while minimizing the increase in overall device complexity.
Solution Approach 2:
The system uses readily available sensor data from the air conditioner's existing sensor network to perform thermal load estimation and frequency adjustment. By leveraging existing resources rather than requiring entirely new measurement systems, the patent achieves improved temperature control precision with minimal additional complexity.
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 provides stable temperature control and reduces power consumption by optimizing the air conditioner's performance, ensuring adequate cooling/heating capacity and improving energy efficiency.
Implementation Method 1
The refrigerant absorbs heat from warm indoor air upon passing through the evaporator
Implementation Method 2
the heat carried with the refrigerant is blown to an outdoor environment to make the indoor temperature below the outdoor temperature
Data Source
AI summary
An intelligent thermostatic method for an air conditioner blowing cold and hot air has steps of calculating an estimated thermal load according to an indoor temperature, an outdoor temperature, a configured temperature, a sunlight intensity, and a cooling/heating capacity corresponding to the estimated thermal load; adjusting the air conditioner according to the estimated thermal load and providing an estimated cooling/heating capacity; and determining a difference value between an actual cooling/heating capacity and the estimated cooling/heating capacity and adjusting the air conditioner according to the difference value for thermostatic control. Accordingly, the air conditioner of the present invention has enhanced power utilization efficiency of the air conditioner without having to repeatedly turn on and off the electric compressor of the air conditioner.