Thermal management system for high load conditions

The thermal management system with a bypassed coolant and air paths, and an ejector-based refrigerant circuit, addresses the cooling capacity challenges of R744 systems, enhancing performance under high-load conditions by reducing suction pressure and maintaining flow rates, thus achieving efficient and cost-effective cooling.

DE102024134546A1Pending Publication Date: 2026-05-28DENSO AUTOMOTIVE DEUT GMBH +1
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Patent Information

Application Number
DE102024134546
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-11-22
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Existing thermal management systems using carbon dioxide (R744) as a refrigerant face challenges in achieving high cooling capacity during fast charging and high ambient temperatures due to its lower cooling performance compared to conventional refrigerants, and existing solutions like hardware modifications and additional sensors increase cost and space requirements.

Method used

A thermal management system with a refrigerant circuit that includes a second coolant branch bypassing the first heat exchanger and a secondary air path bypassing the second heat exchanger, controlled by proportional valves and air dampers, along with an ejector-based refrigerant circuit, to manage refrigerant and airflow distribution, reducing suction pressure and maintaining minimum flow rates.

Benefits of technology

Enhances cooling capacity by reducing suction pressure and maintaining efficient operation under high-load conditions, particularly during vehicle startup, while being compact and cost-effective.

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Abstract

The present invention relates to a thermal management system (10) for a vehicle with an R744 refrigerant circuit (20) and a method for operating the same. The thermal management system (10) comprises a coolant circuit (30) with a first coolant branch (32) in thermal exchange with an electrical component (34) to be cooled and a first heat exchanger (25) which is arranged within the low-pressure section of the refrigerant circuit (20). It further comprises a vehicle air conditioning unit (40) with a primary air path (43) with a second heat exchanger (26) arranged therein, which is also arranged within the low-pressure section of the refrigerant circuit (20).The thermal management system is characterized in that the coolant circuit (30) has a second coolant branch (33) which bypasses the first heat exchanger (25) and thereby creates a short-circuit loop around the electrical component (34) to be cooled, and / or the at least one air duct (41) has a secondary air path (44) which bypasses the second heat exchanger (26). The operating method is characterized in that the flow rates through the first heat exchanger (25) and / or the second heat exchanger (26) are adjusted depending on the comparison of a temperature limit associated with at least one of the first / second heat exchangers (25, 26) with correspondingly measured temperature values.
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Citation Information

Patent Citations

  • Air conditioning system of a motor vehicle and method for operating the air conditioning system

    DE102018104410A1

  • Cooling system for cooling components

    DE102020200964A1

  • Refrigerant circuit, in particular for a motor vehicle and methods for operating such a circuit

    DE102022130636A1

  • Method for operating a supercritical refrigerant circuit

    DE102023118657A1

  • Heat pump circuit

    DE112011101957T5