Phased Electronic Expansion Valve Operation for Stable Refrigerant Flow
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Solution Overview
Problem
In mobile air-conditioning systems, the electronic expansion valve's operation is hindered by oscillations and requires faster initialization and adjustable speed control to cope with changing environmental conditions, which existing systems fail to manage effectively.
Innovation Solution
A refrigerant circulation system with a control system that includes a central processing module and a step drive controlling module, allowing for the adjustment of the electronic expansion valve's operation speed based on system requirements, enabling quicker initialization and stable operation by controlling the flow of electricity through the valve's coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electronic expansion valve operates at high speed continuously, then the initialization is faster, but oscillations increase and system stability deteriorates
Solution Approach 1:
The patent implements dynamic speed adjustment of the electronic expansion valve by dividing operation into distinct phases: initialization phase uses high speed for rapid response, while normal operation phase uses lower speed for stability. The control system dynamically switches between speed modes based on operational requirements, resolving the contradiction between speed and stability.
Solution Approach 2:
The patent employs periodic action through phased operation modes. The initialization phase is a time-limited high-speed period, followed by a normal operation period with reduced speed. This periodic switching between high-speed and low-speed modes allows the system to achieve fast initialization while maintaining stability during sustained operation.
2Stability of the object's composition
If the electronic expansion valve operates at low speed, then oscillations are reduced, but initialization time increases
Solution Approach 1:
The control system dynamically adjusts the operation speed based on the operational phase. During initialization, the valve operates at high speed to minimize initialization time. Once initialization is complete, the system transitions to low-speed operation to reduce oscillations. This dynamic adjustment resolves the time-stability trade-off.
Solution Approach 2:
The patent performs preliminary high-speed action during the initialization phase to quickly establish the desired opening degree. This preliminary fast action completes the critical initialization task before transitioning to stable low-speed operation, thereby minimizing the time loss while ensuring subsequent stability.
3Device complexity
If the electronic expansion valve uses fixed speed operation, then control is simple, but adaptability to changing environmental conditions deteriorates
Solution Approach 1:
The control system implements dynamic speed adjustment based on operational phases and environmental conditions. The system switches between high-speed initialization mode and low-speed normal operation mode, and can further adjust speed based on detected environmental changes. This dynamic approach maintains reasonable control complexity while significantly improving adaptability.
Solution Approach 2:
The patent changes the operational parameter (speed) based on different operational phases and environmental conditions. The control system monitors system state and adjusts the valve operation speed accordingly, using parameter changes to achieve adaptability without requiring complex structural modifications.
4Loss of time
If the electronic expansion valve operates quickly, then response time is reduced, but oscillations and harmful factors increase
Solution Approach 1:
The patent uses periodic action by limiting high-speed operation to a specific initialization period. During this brief period, fast response is achieved. After initialization completes, the system transitions to a second period with reduced speed to minimize oscillations and harmful factors. This temporal separation resolves the contradiction between response time and oscillation generation.
Solution Approach 2:
The control system dynamically adjusts the operation speed based on the operational phase. High speed is applied only when needed for rapid response during initialization, then automatically reduced to minimize oscillations. This dynamic speed adjustment ensures fast response when necessary while generating minimal harmful oscillations during normal operation.
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 reduces oscillations and enables the electronic expansion valve to operate quickly during initialization and adjust its speed according to conditions, ensuring stable system performance and energy efficiency.
Implementation Method 1
the controller provides a voltage pulse sequence to a coil of the step motor in the electronic expansion valve regularly, such that the coil of each phase of the step motor is energized or de-energized according to a certain rule, to regularly control the change of the magnetism of each claw pole of a stator of the coil, and further control the rotation of a rotor
Data Source
AI summary
A refrigerant circulation system includes a control system and an electronic expansion valve. The control system includes a central processing module, a step drive control module, and a drive module. The operation of the electronic expansion valve in the refrigerant circulation system includes an initialization operation stage and a flow adjustment operation stage, and a maximum operation speed of the electronic expansion valve in the flow adjustment operation stage is smaller than or equal to a maximum operation speed of the electronic expansion valve in the initialization operation stage, and a minimum operation speed of the electronic expansion valve in the flow adjustment operation stage is smaller than a minimum operation speed of the electronic expansion valve in the initialization operation stage, so that stable and fast adjustment of the system can be implemented, and the system keeps stable running.