Method for maximizing a refrigerant in active system sections of a refrigeration system, refrigeration system, and motor vehicle comprising such a refrigeration system
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Solution Overview
Problem
Refrigeration systems in motor vehicles often operate underfilled in the active area, leading to performance losses due to inadequate refrigerant management across different operating states.
Innovation Solution
A method for optimizing refrigerant management by detecting pressure in inactive lines, lowering pressure in active lines to facilitate refrigerant extraction from inactive lines, and using valve devices to control the extraction process, ensuring maximum refrigerant quantity in active areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If refrigerant is allowed to remain in inactive lines during operation, then the system structure is simple and operation is easy, but the active refrigerant quantity is insufficient leading to performance losses
Solution Approach 1:
The system performs preliminary action by detecting pressure in inactive lines and actively extracting refrigerant before the system operates underfilled. The control unit monitors pressure and triggers extraction when pressure exceeds a threshold, ensuring adequate refrigerant quantity is established before performance-critical operations begin.
Solution Approach 2:
The system implements feedback by continuously monitoring pressure in inactive lines using pressure sensors and using this information to control the extraction process. The control unit adjusts the extraction operation based on real-time pressure data, stopping when pressure drops below the threshold, creating a closed-loop control system that optimizes refrigerant distribution.
2Quantity of substance
If pressure in active line is lowered to extract refrigerant from inactive line, then refrigerant quantity in active area is maximized, but the pressure control process becomes more complex
Solution Approach 1:
The system uses an intermediary approach by introducing a control unit that mediates between the pressure sensor detection and the valve device activation. The control unit processes the pressure signal and controls the valve timing and duration, acting as an intelligent intermediary that simplifies the overall control architecture while achieving precise refrigerant extraction.
Solution Approach 2:
The system enables self-service by allowing the pressure difference between inactive and active lines to drive the refrigerant extraction process automatically. Once the valve is opened, the natural pressure gradient causes refrigerant to flow from the high-pressure inactive line to the low-pressure active line without requiring active pumping or complex control mechanisms.
3Measurement precision
If pressure sensor detection is used to control refrigerant extraction, then extraction timing is precise, but the system requires additional sensors and control infrastructure
Solution Approach 1:
The control unit serves multiple functions: it reads pressure sensor signals, determines when extraction should occur based on threshold comparison, controls the valve device timing and duration, and monitors the extraction process completion. This multi-functional approach consolidates control logic into a single component, reducing overall system complexity despite the added sensor.
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 method ensures the refrigeration system operates efficiently by maximizing refrigerant in active areas, preventing underfilling, and maintaining system performance across various operating states.
Implementation Method 1
a refrigerant compressor (12) which is connectable or connected to a primary line (14) and a secondary line (16)
Implementation Method 2
a directly or indirectly acting external heat exchanger (18), which is arranged in the primary line (14)
Implementation Method 3
an evaporator (22), which is arranged in the primary line (14)
Implementation Method 4
at least one further heat exchanger acting as a heat source, in particular a heating register (26), which is arranged in the secondary line (16)
Implementation Method 5
activating an extraction of refrigerant from the inactive line into the active line by lowering the pressure in the active line to a value below the pressure in the inactive line
Data Source
AI summary
A method for operating a refrigeration system for a motor vehicle. The method includes setting an operating mode of the refrigeration system having active primary line and inactive secondary line or having active secondary line and inactive primary line; detecting the pressure in the inactive line; and activating and extraction of refrigerant from the inactive line into the active line by lowering the pressure in the active line to a value below the pressure in the inactive line and by opening the relevant valve device.