Refrigerator control method and system using linear compressor
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Solution Overview
Problem
Linear compressors in refrigerators face issues with piston collision at low temperatures, leading to potential mechanical failure and the need for protective measures that can interrupt operation.
Innovation Solution
A refrigerator control method and system that dynamically adjusts the output power of the linear compressor based on ambient temperature and operational state, increasing power when necessary to prevent piston collision and ensure normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the linear compressor operates at low output power to match low thermal load at low 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 adjusting the output power based on ambient temperature. When ambient temperature is low (≤10°C), the system increases the output power from the first preset power to the second preset power, which increases the piston stroke amplitude to prevent collision with the air discharging valve plate while maintaining efficient operation.
2Reliability
If protective measures are activated to prevent piston collision, then mechanical failure is avoided, but compressor operation is interrupted and cooling function is lost
Solution Approach 1:
The system performs preliminary action by detecting ambient temperature in advance and proactively adjusting the compressor output power before piston collision can occur. When the ambient temperature is detected to be ≤10°C, the control system increases the output power ahead of time, ensuring the piston stroke is sufficient to avoid collision with the air discharging valve plate, thus preventing mechanical failure before it happens.
3Reliability
If the piston stroke is increased to prevent collision, 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 adjustment of compressor output power based on ambient temperature conditions. The system switches between two preset power levels: the first preset power for normal conditions (ambient temperature >10°C) and the second preset power for low temperature conditions (ambient temperature ≤10°C). This dynamic adaptation ensures the piston stroke is always sufficient to prevent collision while minimizing unnecessary power consumption.
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 approach prevents mechanical failure by increasing the piston stroke, allowing the refrigerator to operate normally without activating protective measures, thus ensuring continuous operation and avoiding unnecessary power adjustments.
Implementation Method 1
a piston driven by an electric motor, and discharges high-temperature and high-pressure coolant air
Implementation Method 2
compresses the coolant air using a piston driven by an electric motor, and discharges high-temperature and high-pressure coolant air
Implementation Method 3
providing driving power for a cooling cycle and realizing the cooling cycle including compression→condensing (heat radiating)→expanding→evaporating (heat absorbing) steps
Implementation Method 4
realizing the cooling cycle including compression→condensing (heat radiating)→expanding→evaporating (heat absorbing) steps
Data Source
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.