Variable capacity compressor operation mode determination method and device, variable capacity compressor, and air conditioner
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Solution Overview
Problem
Variable capacity compressors face challenges in accurately determining the success of switching between single-cylinder and dual-cylinder operation modes, leading to inefficiencies and jitter issues due to varying compressor displacement and motor efficiency, which affects lubrication system control.
Innovation Solution
A method and device for determining the successful switching of compressor operation modes by comparing current values before and after mode switching, controlling discharge and suction pressure differences within preset ranges, and adjusting operation frequencies to ensure accurate mode determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the compressor switches between single-cylinder and dual-cylinder operation modes, then the compressor displacement and motor efficiency change, but the determination accuracy of switching success is insufficient
Solution Approach 1:
The patent employs feedback control by detecting the compressor current before and after mode switching, comparing the current values to determine whether switching succeeded, and then adjusting the operation frequency accordingly. This closed-loop feedback mechanism ensures accurate determination of switching success while adapting to different operation modes.
Solution Approach 2:
The patent changes the operation frequency parameter based on the determined switching success. When switching succeeds, the operation frequency is adjusted to optimize compressor performance for the new mode. This parameter adjustment resolves the contradiction by adapting the system to different operation modes while maintaining accurate control.
2Device complexity
If the compressor operates in single-cylinder mode, then the structure is simpler, but the rotor force is unstable due to eccentric rotation
Solution Approach 1:
The patent dynamically adjusts the operation frequency based on the determined operation mode and switching success. This dynamic adjustment optimizes the rotor force characteristics for each mode, stabilizing the eccentric rotation in single-cylinder mode while maintaining system simplicity.
Solution Approach 2:
By changing the operation frequency parameter according to the detected mode and switching success, the patent optimizes the mechanical characteristics of the rotor, reducing jitter and stabilizing the force on the rotor during eccentric rotation while keeping the overall structure simple.
3Productivity
If the compressor operates in dual-cylinder mode with different cylinder volumes, then the capacity increases, but the jitter problem occurs
Solution Approach 1:
The patent dynamically adjusts the operation frequency based on the determined dual-cylinder operation mode. This dynamic control optimizes the synchronization and balance of the two cylinders with different volumes, reducing vibration and jitter while maintaining the increased capacity benefit of dual-cylinder operation.
Solution Approach 2:
Through feedback control, the system detects switching success in dual-cylinder mode and adjusts the operation frequency accordingly. This feedback mechanism ensures that the compressor operates at optimal frequencies for dual-cylinder mode, minimizing jitter while maintaining high capacity.
4Device complexity
If the compressor operation mode switching is not accurately determined, then the control system is simpler, but the lubrication system control is affected
Solution Approach 1:
The patent implements a feedback-based determination method that compares current values before and after mode switching. This feedback mechanism provides accurate determination of switching success, ensuring reliable lubrication system control while keeping the control system relatively simple through straightforward current comparison and frequency adjustment.
Data Source
AI summary
Disclosed are a variable capacity compressor operation mode determination method and device, a variable capacity compressor and an air conditioner. The variable capacity compressor operation mode determination method includes: detecting a current value of a compressor at present as A1 before switching an operation mode of the compressor; detecting the current value of the compressor at present as A2 after switching the operation mode of the compressor and reaching a preset time; comparing A1 and A2, determining that the switching of the operation mode of the compressor is successful when a ratio relationship between A1 and A2 satisfies a preset condition, and determining that switching of the operation mode of the compressor is failed when the ratio relationship between A1 and A2 dissatisfies a preset condition.