Multi-mode Valve Assembly for Electric Vehicle Thermal Control
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Solution Overview
Problem
Current thermal management systems for electric vehicles inadequately control the temperature of both the battery pack and drive train components, particularly under varying ambient conditions and during high-performance driving, leading to inefficiencies and potential overheating issues.
Innovation Solution
A multi-mode valve assembly within the drive train control loop that dynamically adjusts thermal coupling between the propulsion motor and secondary drive train components, allowing for series or parallel operation to optimize thermal management based on component requirements and ambient conditions, using a heat transfer fluid and a radiator with a diverter valve for efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cooling loop is used to cool both the battery pack and drive train components, then the system structure is simplified, but the temperature control precision for each component deteriorates
Solution Approach 1:
The cooling system is segmented into multiple independent cooling loops: a first cooling loop for the battery pack, a second cooling loop for the propulsion motor, and a third cooling loop for the power electronics. Each loop has its own circulation pump and can be controlled independently, allowing precise temperature management for each component while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The system employs dynamically controllable three-way mixing valves in each cooling loop that can adjust coolant flow distribution in real-time based on thermal demands. The valves respond to temperature sensor feedback, enabling the system to adapt cooling capacity dynamically to match varying operational conditions and component thermal requirements.
2Manufacturing precision
If multiple independent cooling loops are used for each component, then the temperature control precision is improved, but the system complexity increases
Solution Approach 1:
Each cooling loop is designed to serve multiple functions: the first cooling loop cools the battery pack during normal operation and can provide heating during cold conditions; the second and third loops similarly handle both cooling and heating. This multi-functionality reduces the need for separate dedicated systems for each thermal management function, balancing precision with complexity.
Solution Approach 2:
Temperature sensors are strategically placed throughout the system to monitor component temperatures and coolant temperatures. This feedback is processed by a control system that automatically adjusts valve positions and pump operations, enabling precise temperature control while simplifying the overall system architecture through intelligent automation rather than mechanical complexity.
3Reliability
If the cooling system operates at high capacity to prevent overheating during hard driving, then the reliability is improved, but the energy consumption increases
Solution Approach 1:
The cooling system operates periodically rather than continuously, with circulation pumps activating only when thermal thresholds are exceeded. Temperature sensors trigger pump operation when components approach critical temperatures, and the pumps deactivate when thermal conditions improve, reducing energy consumption while maintaining reliable overheating prevention through on-demand high-capacity cooling when needed.
Solution Approach 2:
The system dynamically changes operational parameters including coolant flow rate, pump speed, and valve positions based on real-time thermal conditions. During moderate operation, the system operates at low capacity with reduced flow rates; during hard driving or high thermal loads, parameters are adjusted to maximize cooling capacity, optimizing the balance between reliability and energy consumption across varying operating conditions.
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 system provides enhanced thermal control and efficiency by optimizing the temperature management of both the battery pack and drive train components, ensuring they operate within their preferred ranges while minimizing energy consumption and preventing overheating.
Implementation Method 1
a drive train thermal control loop that is thermally coupled to a vehicle propulsion motor and to at least one secondary drive train component
Implementation Method 2
a radiator with a diverter valve for efficient cooling
Implementation Method 3
a radiator with a diverter valve for efficient cooling
Data Source
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AI summary
A multi-mode electric vehicle thermal management system that utilizes a multi-mode valve assembly within the drive train control loop to provide efficient thermal control of the drive train components is provided. The multi-mode valve assembly allows the mode of thermal coupling between the thermal control loop and the various drive train components (e.g., vehicle propulsion motor, gearbox assembly, power electronics subsystem, etc.) to be varied in accordance with present conditions.