Refrigerator control method and control system using linear compressor
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Solution Overview
Problem
Linear compressors in refrigerators face piston collisions with air discharging valve plates at low temperatures, leading to potential mechanical failure and the need for protective shutdowns due to low output power, which results in reduced piston stroke and increased risk of collision.
Innovation Solution
A control method and system that monitors ambient temperature and adjusts the linear compressor's output power: setting it to a higher power when temperatures are low to prevent piston collisions, dynamically updating output power based on operational states, and associating specific output powers with ambient temperatures to ensure normal operation and avoid protective shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the linear compressor operates at low output power to match low thermal load at low ambient temperatures, then energy efficiency is improved, but the piston stroke becomes too small causing collision with the air discharging valve plate and mechanical failure
Solution Approach 1:
The patent changes the operating parameters of the linear compressor by establishing different output power settings based on ambient temperature thresholds. When ambient temperature is below the threshold, the system switches to a second output power setting (greater than the first) to ensure sufficient piston stroke and prevent mechanical collision, while still maintaining energy efficiency compared to continuous high-power operation.
2Reliability
If the piston stroke is increased to prevent collision with the air discharging valve plate, then mechanical reliability is improved, but the cooling output increases beyond what is needed for low thermal load conditions
Solution Approach 1:
The patent implements dynamic output power adjustment based on real-time ambient temperature monitoring. The control system dynamically switches between different output power levels (first and second output powers) according to whether the ambient temperature is above or below a predetermined threshold, allowing the piston stroke to be optimized for each operating condition rather than remaining fixed.
Solution Approach 2:
The system changes the operating parameter (output power) of the linear compressor based on ambient temperature conditions. By setting different output power levels corresponding to different temperature ranges, the system achieves parameter optimization that balances mechanical reliability with energy efficiency.
3Reliability
If the linear compressor operates continuously at sufficient output power to prevent piston collision, then mechanical reliability is maintained, but the refrigerator cannot efficiently adapt to varying thermal loads and operates at reduced energy efficiency
Solution Approach 1:
The patent implements dynamic adaptation of the linear compressor output power based on ambient temperature and thermal load conditions. The control system adjusts the output power level dynamically - using the first output power when ambient temperature is high (greater than threshold) and the second output power when ambient temperature is low (less than or equal to threshold) - thereby optimizing both reliability and cooling efficiency for each operating scenario.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution increases the piston stroke within the linear compressor, preventing collisions and ensuring continuous operation by dynamically adjusting output power in response to temperature and operational conditions, thereby avoiding the need for protective shutdowns and maintaining refrigerator functionality.
Implementation Method 1
a movable-magnet type linear oscillating motor
Data Source
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AI summary
The present invention discloses a refrigerator control method and system using a linear compressor. The control method comprises: monitoring an ambient temperature T of a refrigerator; comparing the ambient temperature T with a preset ambient temperature threshold T0; if T is greater than T0, controlling an output power of the linear compressor to be a preset first output power, and if T is smaller than or equal to T0, controlling the output power of the linear compressor to be a preset second output power, which is greater than the preset first output power. In the present invention, by increasing the stroke of the piston inside the linear compressor through controlling the output power of the linear compressor, the refrigerator can be guaranteed to work normally by avoiding protection of the linear compressor by the frequency converting board.