Refrigerator controlling method and system with linear compressor
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Solution Overview
Problem
Linear compressors in refrigerators face issues with piston collision due to small stroke at low temperatures, leading to potential mechanical damage and system shutdown, as existing frequency conversion protection mechanisms may incorrectly intervene, stopping the compressor.
Innovation Solution
A refrigerator controlling method and system that monitors environment temperature and adjusts the operation condition of the linear compressor by increasing the refrigeration amount or piston stroke through heating load adjustments, ensuring the compressor operates safely and efficiently even at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the linear compressor operates at low temperature with reduced refrigeration amount, then energy consumption is reduced, but the piston stroke becomes too small causing collision with the exhaust valve plate
Solution Approach 1:
The control system performs preliminary detection of the operating temperature and, when low temperature is detected, preemptively increases the refrigeration amount before piston collision can occur. This prevents the harmful effect by taking advance action based on temperature conditions.
Solution Approach 2:
The patent dynamically changes the refrigeration amount parameter based on operating temperature. When temperature is low, the refrigeration amount is increased to maintain sufficient piston stroke, while at normal temperatures the refrigeration amount is reduced for energy savings. This parameter adjustment resolves the contradiction between energy efficiency and reliability.
2Reliability
If the frequency conversion plate stops the compressor for protection, then mechanical damage is prevented, but unnecessary shutdowns occur reducing productivity
Solution Approach 1:
The control system continuously monitors operating temperature and uses this feedback to dynamically adjust the refrigeration amount. This closed-loop control prevents piston collision by maintaining appropriate stroke length, eliminating the need for protective shutdowns while ensuring mechanical safety.
Solution Approach 2:
The system takes preliminary protective action by detecting low temperature conditions and adjusting the refrigeration amount before piston collision can occur. This prevents the need for reactive shutdowns, maintaining both mechanical protection and operational continuity.
3Reliability
If the piston stroke is increased to prevent collision, then compressor reliability is improved, but the refrigeration amount becomes excessive causing temperature to drop below target
Solution Approach 1:
The patent dynamically adjusts the refrigeration amount parameter based on real-time temperature monitoring. When low temperature conditions are detected, the refrigeration amount is increased to prevent piston collision. When normal temperature is reached, the refrigeration amount is reduced to maintain target temperature. This dynamic parameter change resolves the contradiction between reliability and temperature control.
Solution Approach 2:
The system transitions from static refrigeration amount settings to dynamic adjustment based on operating conditions. The refrigeration amount is continuously adapted to match actual temperature requirements, allowing the system to maintain both sufficient piston stroke for reliability and appropriate temperature control.
Data Source
AI summary
The present invention discloses a refrigerator controlling method and system with a linear compressor. The method comprises: monitoring an environment temperature T of the refrigerator located in the environment comparing the environment temperature T with a preset environment temperature threshold T0; if T is larger than T0, controlling a refrigerating unit and/or a heating unit in the refrigerator such that the refrigerator runs under a first operation condition; and if T is smaller than or equal to T0, controlling the refrigerating unit and/or the heating unit in the refrigerator such that the refrigerator runs under a second operation condition. When the linear compressor runs within predetermined time, a refrigeration amount of the linear compressor under the second operation condition is controlled to be larger than a refrigeration amount of the linear compressor under the first operation condition, such that a compartment of the refrigerator reaches a target temperature.