Vehicle Coolant Loop Architecture for Independent Thermal Control
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Solution Overview
Problem
Current thermal management systems in vehicles lack efficient and independent control of multiple subsystems, leading to overheating and premature failure due to inadequate waste heat management, and require additional heating in cold conditions.
Innovation Solution
A vehicle thermal system utilizing a common refrigeration-cycle thermal system with multiple liquid coolant loops and a shared coolant reservoir for independent thermal management, allowing direct mixing of coolant streams to transfer waste heat between subsystems without heat exchangers, and using glycol-water coolant for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single thermal management system is used for multiple subsystems, then device complexity is reduced, but temperature control precision deteriorates
Solution Approach 1:
The thermal management system is divided into multiple independent coolant loops, each serving specific subsystems (powertrain loop, cabin loop, component loop). Each loop has its own pump and control valves, enabling independent temperature control of different subsystems while maintaining an integrated system architecture that reduces overall complexity compared to fully separate systems.
Solution Approach 2:
The system employs dynamically controllable three-way mixing valves in each coolant loop that can adjust the ratio of hot and cold coolant mixing in real-time. This dynamic adjustment allows precise temperature control for each subsystem based on varying thermal demands, while the overall system structure remains relatively simple and integrated.
2Loss of energy
If waste heat is not removed from heat-generating components, then energy efficiency is improved by retaining heat, but component reliability deteriorates due to overheating
Solution Approach 1:
Temperature sensors are placed throughout the system to monitor thermal conditions of heat-generating components. The control system uses this feedback information to dynamically adjust coolant flow rates and mixing valve positions, ensuring that waste heat is removed at appropriate rates to maintain component reliability while maximizing energy retention for useful thermal applications.
Solution Approach 2:
The thermal management system automatically balances waste heat removal and retention through its controlled coolant circulation. The system self-regulates by directing coolant flow to absorb excess heat from overheating components and delivering this thermal energy to subsystems requiring heating, eliminating the need for external intervention while maintaining both reliability and energy efficiency.
3Ease of operation
If additional heating is provided during cold-weather conditions, then cabin comfort is improved, but energy consumption increases
Solution Approach 1:
The system converts waste heat that would otherwise be discarded into a useful resource for cabin heating during cold-weather conditions. The controlled coolant circulation directs thermal energy from heat-generating components (motor, inverter, battery) through the cabin heating subsystem, providing comfortable cabin heating while simultaneously removing waste heat to maintain component reliability, thereby improving comfort without proportionally increasing energy consumption.
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 solution enables precise thermal control of various vehicle subsystems, optimizing heat transfer and reducing the risk of overheating while providing heating and cooling as needed, thereby enhancing system reliability and efficiency.
Implementation Method 1
a first liquid loop that is connected to the liquid coolant reservoir, includes a first pump that is upstream from a first functional component to circulate the liquid coolant to the first functional component, is heated by the heat-generating component
Implementation Method 2
is heated by the heat-generating component, and includes a first valve downstream from the first functional component to control recirculation of the liquid coolant or return of the liquid coolant to the liquid coolant reservoir
Implementation Method 3
The second liquid loop is connected to the liquid coolant reservoir, includes a second pump that is upstream from a second functional component to circulate the liquid coolant to the second functional component, is cooled by the heat-absorbing component
Data Source
AI summary
A thermal system includes a heat-generating component, a heat-absorbing component, a liquid coolant reservoir for receiving and distributing a liquid coolant, a first liquid loop that is connected to the liquid coolant reservoir, includes a first pump upstream from a first functional component to circulate the liquid coolant, is heated by the heat-generating component, and includes a first valve downstream from the first functional component to control recirculation or return of the liquid coolant to the liquid coolant reservoir, and a second liquid loop that is connected to the liquid coolant reservoir, includes a second pump upstream from a second functional component to circulate the liquid coolant, is cooled by the heat-absorbing component, and includes a second valve downstream from the second functional component to control recirculation or return of the liquid coolant to the liquid coolant reservoir.