Vehicle Thermal Control With Shared Radiator Priority Switching
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Solution Overview
Problem
In-vehicle temperature control systems face a cooling capacity shortage due to insufficient heat exhaust from the low temperature-side heat exchanger when integrated with a high temperature-side heat exchanger, resulting in a large temperature difference with outside air.
Innovation Solution
The system incorporates a low temperature water cooling circuit and a high temperature water cooling circuit with a common heat radiation portion, executing heat exhaust suppression control to prioritize cooling in the low temperature water cooling circuit based on the state of the unit to be cooled by the low temperature-side heat exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a low temperature-side heat exchanger and a high temperature-side heat exchanger are integrated with a common heat radiation fin and louver, then the device complexity is reduced, but the cooling capacity of the low temperature-side heat exchanger becomes insufficient due to prioritized heat exhaust from the high temperature-side heat exchanger
Solution Approach 1:
The patent implements dynamic control of the louver opening degree based on temperature conditions. When the low temperature-side heat exchanger requires heat exhaust, the louver opening degree is increased to prioritize its cooling needs. This dynamic adjustment resolves the contradiction by allowing the integrated structure to adaptively allocate heat exhaust priority, ensuring reliable cooling for the low temperature-side unit while maintaining the benefits of integration.
2Productivity
If heat exhaust from the high temperature-side heat exchanger is prioritized due to large temperature difference with outside air, then the heat exhaust efficiency is improved, but the cooling capacity shortage occurs in the low temperature water cooling circuit
Solution Approach 1:
The patent changes the parameter of louver opening degree based on operational conditions. By adjusting this parameter, the system can control the airflow distribution between the two heat exchangers. When cooling capacity is needed in the low temperature circuit, the louver opening is increased to improve heat exhaust efficiency for that unit, thus resolving the contradiction between overall heat exhaust efficiency and specific circuit cooling capacity.
Solution Approach 2:
The system dynamically adjusts the louver opening degree in response to temperature conditions and cooling demands. This dynamic control allows the system to shift heat exhaust priority between the high temperature and low temperature heat exchangers as needed, ensuring that cooling capacity requirements are met while maintaining efficient heat exhaust 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 approach suppresses heat exhaust from the high temperature-side heat exchanger while promoting heat exhaust from the low temperature-side heat exchanger, effectively preventing cooling capacity shortages.
Implementation Method 1
a low temperature water cooling circuit 2 and a high temperature water cooling circuit 4 that are configured to exchange heat through a refrigerant circuit 3
Implementation Method 2
exchange heat through a refrigerant circuit
Implementation Method 3
a low temperature-side heat exchanger provided in the low temperature water cooling circuit 2 and a high temperature-side heat exchanger provided in the high temperature water cooling circuit 4 include a common heat radiation portion
Implementation Method 4
heat exhaust from the high temperature-side heat exchanger having a large temperature difference with outside air
Data Source
AI summary
The in-vehicle temperature control system of the present disclosure includes a low-temperature coolant circuit and a high-temperature coolant circuit that are capable of exchanging heat through a refrigerant circuit, a low-temperature side heat exchanger provided in the low-temperature coolant circuit, a high-temperature side heat exchanger provided in the high-temperature coolant circuit, and a common heat radiation unit. The in-vehicle temperature control system executes heat radiation suppression control for suppressing exhaust heat from the high-temperature side heat exchanger under a predetermined condition in which cooling in the low-temperature coolant circuit that is performed based on a state of a unit that is cooled by exhaust heat from the low-temperature side heat exchanger is prioritized, based on the state of the unit.