Control method for refrigeration system, related devices, and storage medium
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Solution Overview
Problem
In low-temperature environments, the low-pressure side of refrigeration systems in battery thermal management systems (BTMS) for electric-powered machinery experiences excessively low refrigerant pressure, leading to disconnection of the low-pressure pressure switch and failure of battery cooling.
Innovation Solution
A control method that activates a water pump and compressor within a specific temperature range, maintains their operation if pressure is below a preset value, and activates a fan when pressure reaches that value to maintain the refrigeration system pressure within a preset range, while prohibiting compressor and fan activation in another temperature range to save energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the compressor and fan are activated to cool the battery in low-temperature environments, then the refrigeration effect is improved, but the refrigerant pressure becomes excessively low causing the low-pressure switch to disconnect
Solution Approach 1:
The patent dynamically adjusts the operating state of the compressor and fan based on real-time detection of refrigerant pressure and battery temperature. The control strategy transitions between different operational modes (compressor off/fan on, compressor on/fan on, both off) depending on whether pressure and temperature thresholds are met, making the system adaptive to changing low-temperature conditions
Solution Approach 2:
The system implements closed-loop feedback control by continuously monitoring refrigerant pressure via a pressure sensor and battery temperature via temperature sensors. The controller uses this feedback information to determine when to activate or deactivate the compressor and fan, ensuring that cooling is provided only when necessary and safe operating pressure is maintained
2Temperature
If the water pump is activated first before the compressor in low-temperature conditions, then the system prepares for cooling, but the refrigerant pressure may drop too low before the compressor starts
Solution Approach 1:
The patent implements preliminary action by activating the water pump before the compressor in low-temperature conditions. This pre-cools the battery and prepares the thermal management system for upcoming cooling demands, while the controller monitors pressure to ensure the compressor only starts when pressure conditions are safe
Solution Approach 2:
The system uses periodic detection and control cycles where the controller continuously monitors pressure and temperature, activating components in a staged manner. The water pump operates in periodic cycles before compressor activation, and both components can operate periodically based on real-time condition assessment rather than continuous operation
3Temperature
If the compressor and fan are continuously activated to maintain battery cooling, then the refrigeration effect is ensured, but energy consumption increases
Solution Approach 1:
The patent implements periodic action by controlling the compressor and fan to operate only when necessary based on real-time temperature and pressure conditions. The controller deactivates these high-consumption components when the battery temperature is within acceptable ranges or when pressure conditions indicate cooling is not needed, significantly reducing energy consumption compared to continuous operation
Solution Approach 2:
The system uses self-service control where the thermal management system automatically adjusts its own operation based on sensor feedback. The controller monitors battery temperature and refrigerant pressure, and autonomously decides when to activate or deactivate the compressor and fan without external intervention, optimizing energy usage based on actual cooling demands
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
Effectively prevents low-pressure switch disconnection, ensuring normal battery cooling operations and energy efficiency in low-temperature conditions.
Implementation Method 1
activating a water pump and a compressor, and in a case that a first pressure corresponding to the refrigeration system being less than a preset pressure value is determined, maintaining the water pump and the compressor in operation
Implementation Method 2
activating a water pump and a compressor of the refrigeration system
Implementation Method 3
activating a fan of the refrigeration system, so as to maintain a pressure of the refrigeration system within a preset pressure range
Data Source
AI summary
Embodiments of the present application provide a control method for a refrigeration system, related devices, and a storage medium, involving battery cooling technology. The method includes: in a case that a current ambient temperature being within a first preset temperature range is determined, a water pump of the refrigeration system and a compressor of the refrigeration system are activated; in a case that a first pressure corresponding to the refrigeration system reaching a preset pressure value is determined, a fan of the refrigeration system is activated, so as to maintain a pressure of the refrigeration system within a preset pressure range for cooling a battery; in a case that the current ambient temperature being within a second preset temperature range is determined, the water pump of the refrigeration system is activated, and activation of the compressor and the fan is prohibited.