Method for operating a refrigerant circuit system for a vehicle, a refrigerant circuit system for carrying out the method and a vehicle having the same
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Solution Overview
Problem
Refrigerant circuit systems for vehicles, particularly battery electric vehicles, are complex and costly due to the large number of sensors required for pressure and temperature measurement, making them difficult to install and maintain.
Innovation Solution
A method that reduces the number of sensors by determining pressure and temperature values in the high-pressure area using measurements from the low-pressure area and a compressor characteristic map, eliminating the need for additional sensors in the high-pressure area, effectively creating a 'virtual' pressure and temperature sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are installed in both high-pressure and low-pressure areas to directly measure pressure and temperature values, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a virtual copy of the high-pressure sensor functionality by calculating pressure values from low-pressure measurements and compressor characteristics, eliminating the need for physical high-pressure sensors while maintaining measurement accuracy
Solution Approach 2:
The patent introduces an intermediary calculation method that uses the compressor characteristic map and low-pressure measurements as mediators to derive high-pressure values, replacing direct physical measurement with an indirect but accurate computational approach
2Measurement precision
If multiple sensors are installed for comprehensive pressure and temperature monitoring, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive physical high-pressure sensors with a virtual sensor implementation that uses computational methods, significantly reducing component costs while maintaining measurement precision through mathematical derivation from low-pressure measurements
Solution Approach 2:
The patent extracts the essential measurement function from physical high-pressure sensors and implements it through software-based calculation, removing the need for costly hardware components while preserving the core monitoring capability
3Measurement precision
If multiple sensors are installed in the refrigerant circuit system, then measurement precision is improved, but installation difficulty increases
Solution Approach 1:
The patent replaces the need for installing physical high-pressure sensors with a virtual sensor approach that uses existing low-pressure sensor data and compressor characteristics, dramatically simplifying installation while maintaining comprehensive monitoring capability
Solution Approach 2:
The patent removes the installation requirement for high-pressure sensors from the system by extracting the measurement function into a computational domain, reducing installation complexity from multiple sensor placements to a single low-pressure sensor installation
Data Source
AI summary
A refrigerant circuit system, in particular a heat pump system, wherein the refrigerant circuit system has a refrigerant circuit, in which a refrigerant circulates and which is divided into a high-pressure area and a low-pressure area, wherein the refrigerant circuit system has a compressor for compressing the refrigerant arranged in the refrigerant circuit is provided. A pressure and temperature value of the refrigerant in the low-pressure area is measured by a pressure and temperature sensor arranged in the low-pressure area and then a pressure value of the refrigerant in the high-pressure area is determined by the measured pressure and temperature value and a provided compressor characteristic map of the compressor. A refrigerant circuit system for a vehicle is provided and is configured to carry out the method and a vehicle, in particular an electrically powered vehicle, which is equipped with such a refrigerant circuit system.