Active control method and device for inverter air conditioner
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Solution Overview
Problem
Inverter air conditioners face challenges in high temperature environments, where elevated compressor frequencies lead to increased heat and pressure, potentially damaging the intelligent power module (IPM) and reducing cooling capacity, necessitating frequency limitations that compromise cooling performance.
Innovation Solution
A control method and controller that dynamically adjust the compressor frequency based on IPM and outdoor coil temperatures, and exhaust pressure, to maintain optimal operation without attenuating cooling capacity, including steps to increase, decrease, or disable the frequency as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inverter compressor operates at higher frequency in high temperature environment, then cooling capacity is improved, but IPM temperature increases and reliability deteriorates
Solution Approach 1:
The patent implements dynamic frequency adjustment based on real-time IPM temperature monitoring. The controller dynamically changes the compressor operating frequency according to temperature conditions, transitioning from fixed frequency operation to adaptive frequency control. This resolves the contradiction by allowing high frequency operation when IPM temperature is acceptable while reducing frequency when temperature rises, thus maintaining both cooling capacity and reliability.
Solution Approach 2:
The patent changes the operating parameters (frequency, duty cycle) of the inverter compressor based on IPM temperature thresholds. By adjusting these parameters dynamically, the system optimizes the balance between cooling performance and component reliability, preventing IPM overheating while maintaining adequate cooling capacity in high temperature environments.
2Productivity
If the inverter compressor operates at higher frequency, then cooling capacity is improved, but exhaust pressure increases and safety deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors exhaust pressure and IPM temperature, then adjusts the compressor frequency accordingly. When exhaust pressure or temperature exceeds thresholds, the controller reduces frequency to bring parameters back to safe ranges. This closed-loop feedback system resolves the contradiction by preventing harmful high pressure conditions while maintaining cooling capacity within safe operating limits.
3Reliability
If the operating frequency is artificially limited to reduce IPM temperature, then reliability is improved, but cooling capacity deteriorates
Solution Approach 1:
Instead of artificial frequency limiting, the patent employs dynamic frequency adjustment based on real-time temperature conditions. The system allows high frequency operation when IPM temperature is within safe ranges, thereby maintaining cooling capacity, while automatically reducing frequency only when temperature thresholds are exceeded. This dynamic approach eliminates the need for conservative frequency limits while ensuring component reliability.
4Object-affected harmful factors
If the operating frequency is artificially limited to reduce exhaust pressure, then safety is improved, but cooling capacity deteriorates
Solution Approach 1:
The patent uses feedback control to monitor exhaust pressure and adjust compressor frequency dynamically. When pressure exceeds safe thresholds, the controller reduces frequency to prevent damage, but allows higher frequencies when pressure is within acceptable ranges. This resolves the contradiction by maintaining safety through active pressure management rather than artificial frequency limiting, thereby preserving cooling capacity during normal operation.
Data Source
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Figure 1B
Figure 2A
AI summary
Embodiments of the present application provide active control method and controller for an inverter air conditioner, in which the inverter compressor is enabled and operated at a first frequency for a first duration to stabilize an indoor temperature at a certain temperature. Then, a temperature of an intelligent power module IPM is detected. If the temperature of the IPM does not exceed the threshold, and the IPM is in a safe environment, a temperature of an outdoor coil is detected. According to a temperature interval into which the temperature of the outdoor coil falls, it is determined whether to adjust the first frequency. If the outdoor coil temperature is relatively low, the first frequency needs to be increased to enhance the cooling capacity of the inverter air conditioner, and to further correct the temperature of the outdoor coil. If the outdoor coil temperature is relatively high, the first frequency does not need any adjustment, and an exhaust pressure is detected, so as to achieve an active control for the inverter air conditioner, thereby fulfilling the purpose of not attenuating the cooling capacity of the inverter air conditioner in the high temperature environment.