Refrigerant system and method for diagnosis in a refrigerant system

By introducing components such as compressors, pressure sensors, and flow valves into the refrigerant system, and calculating pressure and temperature differences, the problem of insufficient diagnostic time in the refrigerant system of electric vehicles is solved, enabling real-time fault handling and improved system stability.

CN115614916BActive Publication Date: 2026-06-12GM GLOBAL TECHNOLOGY OPERATIONS LLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GM GLOBAL TECHNOLOGY OPERATIONS LLC
Filing Date
2022-05-24
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

When the refrigerant system is not in use, existing technologies are insufficient for effective diagnosis, especially in electric vehicles where the refrigerant system is frequently in operation. This results in insufficient diagnostic time, affecting the system's health monitoring and fault detection.

⚗Method used

By employing a compressor, multiple high-pressure and low-pressure side pressure sensors, flow valves, and temperature sensors, and calculating pressure and temperature differences, the system implements remedial actions on the high-pressure and low-pressure sides, such as closing valves or stopping the compressor, enabling real-time diagnosis and fault handling.

🎯Benefits of technology

It enables real-time diagnosis and fault handling during refrigerant system operation, improves the system's health monitoring capabilities, promptly detects and addresses potential problems, and ensures stable system operation.

✦ Generated by Eureka AI based on patent content.

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Abstract

A refrigerant system includes a compressor, a plurality of pressure sensors, a plurality of refrigerant flow valves, and a processor. The compressor is configured to provide refrigerant at a first pressure. A first pressure sensor is configured to measure a first pressure of the refrigerant. A second pressure sensor is configured to measure a second pressure of the refrigerant. The refrigerant flow valves have a plurality of flow valve positions. The processor is configured to: calculate an incremental value as a difference between the first pressure and the second pressure; calculate an expected incremental value between the first pressure and the second pressure based on a ratio of the compressor to a low-side density of the refrigerant at the flow valve positions; and implement a remedial action if a deviation of the incremental value from the expected incremental value is greater than a threshold value.
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