Method for controlling power-on or power-off of air conditioner
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Solution Overview
Problem
Frequency conversion split air conditioners face issues with compressor cylinder state uncertainty during startup, leading to uncontrolled vibration and stress on the pipeline due to unknown operation states upon shutdown.
Innovation Solution
A method to control the power-on and power-off of air conditioners by determining and adjusting the compressor to a standby single-cylinder operation state before startup, ensuring the pressure at the variable capacity port equals the air intake port pressure, thereby eliminating abnormal vibrations and ensuring reliable startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor operates in dual-cylinder mode during shutdown, then the cooling/heating capacity is sufficient, but the cylinder state becomes uncertain during next startup causing vibration and pipeline stress
Solution Approach 1:
The patent applies preliminary action by forcing the compressor into single-cylinder mode before startup when dual-cylinder mode was detected during previous operation. This pre-adjustment of the cylinder state eliminates the harmful vibration and pipeline stress that would occur during startup, while maintaining the ability to operate in dual-cylinder mode during normal shutdown for sufficient cooling/heating capacity
2Reliability
If the compressor operates in dual-cylinder mode during shutdown, then the cooling/heating capacity is sufficient, but the pipeline stress increases due to uncertain cylinder state
Solution Approach 1:
The patent applies preliminary action by adjusting the compressor to single-cylinder mode before startup when dual-cylinder operation is detected. This pre-adjustment equalizes the pressure between the variable capacity port and air intake port, preventing pipeline stress and vibration during startup while maintaining dual-cylinder capability during normal operation
Data Source
AI summary
A method for controlling the power-on or power-off of an air conditioner is provided. The method includes the following steps: determining whether a variable capacity compressor of the air conditioner is in a standby single-cylinder operation state before starting the air conditioner, where the variable capacity compressor is configured to be switchable between a single-cylinder operation state and a dual-cylinder operation state; if so, starting the air conditioner; if not, switching the variable capacity compressor to the standby single-cylinder operation state, and then starting the air conditioner. With this control method, regardless of whether the air conditioner is shut down because the power supply of the unit is cut off or because a power-off signal is received, the air conditioner can be started in a single-cylinder operation state in the next startup, so that the operation state of the cylinder is always determined when starting the air conditioner.