Method and apparatus for controlling compressor to switch cylinder mode, machine set, and air conditioner system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Compressors in air conditioning systems often fail to switch to double-cylinder operation mode, especially at ultra-low temperatures, due to system pressure difference value issues and fluctuations caused by changes in components like fans and electronic expansion valves, leading to reduced energy efficiency and reliability.
Innovation Solution
A control method that determines the need to switch from single-cylinder to double-cylinder operation mode by adjusting system pressure difference values through parameter adjustments, such as reducing fan speeds and electronic expansion valve steps, and providing torque compensation to stabilize the compressor in the double-cylinder mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the compressor switches to double-cylinder operation mode, then the energy efficiency of the unit is improved, but the system pressure difference value becomes unstable due to component changes
Solution Approach 1:
The control method performs preliminary detection of the system pressure difference value before initiating cylinder switching. By checking whether the pressure difference is within the preset interval in advance, the system prepares for switching only when conditions are favorable, preventing instability caused by premature switching during component transitions.
Solution Approach 2:
The control method continuously monitors the system pressure difference value and uses this feedback to determine whether switching conditions are met. The controller adjusts switching timing based on real-time pressure difference feedback, ensuring switching occurs only when the system is in a stable state, thus maintaining pressure difference stability while enabling energy-efficient double-cylinder operation.
2Adaptability or versatility
If the compressor switches cylinder mode during component changes, then the operational flexibility is improved, but the reliability of cylinder switching deteriorates
Solution Approach 1:
The control method detects component change states in advance and prevents cylinder switching during these transitions. By performing preliminary detection of component states and blocking switching commands during unstable periods, the system maintains high switching reliability while preserving operational flexibility for switching during stable periods.
Solution Approach 2:
The control method applies preliminary anti-action by preventing switching commands from being executed when component changes are detected. This proactive blocking of potentially harmful switching operations during vulnerable periods ensures reliable switching only when the system is in a stable state, while still allowing flexible operation during stable periods.
3Reliability
If the compressor operates in single-cylinder mode at ultra-low temperature, then the starting reliability is improved, but the energy efficiency deteriorates
Solution Approach 1:
The control method dynamically adjusts the compressor operation mode based on real-time detection of system pressure difference and component states. At ultra-low temperatures, the system starts in single-cylinder mode for reliability, then dynamically switches to double-cylinder mode when stability conditions are met, optimizing the balance between starting reliability and ongoing energy efficiency.
Solution Approach 2:
The control method changes the operational parameters of the compressor by switching between single-cylinder and double-cylinder modes based on detected system conditions. This parameter change allows the system to maintain reliable single-cylinder operation during starting at ultra-low temperatures while transitioning to energy-efficient double-cylinder operation when stability is confirmed.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A method and apparatus for controlling a compressor to switch a cylinder mode and an air conditioner system. The method for controlling a compressor to switch a cylinder mode includes: determining that a compressor is required to switch from a single-cylinder operation mode to a two-cylinder operation mode (S101); determining whether a system pressure differential is within a first preset system pressure differential interval (S102) ; if not, adjusting a system control parameter such that the system pressure differential is within the first preset system pressure differential interval (S103); and controlling the compressor to switch from the single-cylinder operation mode to the two-cylinder operation mode (S104).