Adaptive EV Cooling System Mode Switching
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Solution Overview
Problem
The existing cooling systems for electric vehicles are oversized due to design based on maximum torque and output power requirements, which are rarely met during normal operation, leading to inefficient energy consumption and larger physical sizes.
Innovation Solution
A cooling system with a control unit that adjusts between two operational modes, utilizing a cooling medium circulation path, heat exchange unit, blower unit, and control unit to optimize cooling based on the vehicle's operational region, reducing the physical size of the electric motor and inverter power supply while maintaining equivalent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling system is designed based on maximum torque and output power requirements, then the cooling capability is sufficient for peak performance, but the physical size and energy consumption increase significantly
Solution Approach 1:
The cooling system dynamically adjusts its cooling capability by switching between first and second cooling modes based on the operational region of the electrically powered drive unit. The control unit monitors the drive force and activates the appropriate cooling mode, making the cooling system adaptive rather than static, thus avoiding the need for oversized components designed for peak conditions only.
Solution Approach 2:
The system changes operational parameters by switching between two distinct cooling modes with different cooling capabilities. The first cooling mode operates with lower cooling capacity during normal operation, while the second cooling mode provides higher cooling capacity when maximum torque or output power is required, optimizing the balance between size and performance.
2Reliability
If the cooling system is designed for maximum torque and output power, then peak cooling demands are met, but energy consumption increases during normal operation
Solution Approach 1:
The cooling system transitions from a static design to a dynamic one by continuously monitoring the operational region and adjusting the cooling mode accordingly. This dynamic adaptation ensures that energy-consuming cooling components operate at appropriate levels, reducing unnecessary energy consumption during normal operation while maintaining sufficient cooling capability when needed.
Solution Approach 2:
The system applies partial cooling action (first cooling mode) during normal operation when full cooling capability is not required, and switches to excessive cooling action (second cooling mode) only when maximum cooling demand occurs. This partial action approach reduces energy consumption while still meeting cooling requirements.
3Reliability
If a single high-capacity cooling mode is used continuously, then cooling performance is maintained under all conditions, but energy efficiency decreases during low-demand operation
Solution Approach 1:
The cooling system employs dynamic mode switching based on real-time monitoring of the drive force and operational region. The control unit determines whether to activate the first or second cooling mode, enabling the system to adapt its cooling performance to actual demands, thereby improving energy efficiency without compromising reliability.
Solution Approach 2:
The control unit periodically evaluates the operational region and switches between cooling modes as needed. This periodic assessment and switching mechanism ensures that the cooling system operates at the appropriate capacity level, avoiding continuous high-capacity operation and improving overall energy efficiency.
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 reduces the physical size and energy consumption of the electric motor and inverter power supply, enhancing the overall efficiency of the electric vehicle by optimizing cooling according to operational demands.
Implementation Method 1
a heat exchange unit that performs exchange of heat between the cooling medium and external air
Implementation Method 2
a blower unit that blows air against the heat exchange unit
Implementation Method 3
a cooling medium circulation unit that circulates the cooling medium along the cooling medium circulation path between the heat exchange unit and the electrically powered drive unit
Data Source
AI summary
A cooling system of an electric vehicle includes a cooling medium circulation path that circulates a cooling medium to an electrically powered drive unit of a vehicle, a heat exchange unit between the cooling medium and external air, a cooling medium circulation unit, a blower unit that blows air against the heat exchange unit, and a control unit that controls the cooling medium circulation unit and the blower unit, thus controlling cooling of the electrically powered drive unit. The control unit controls the cooling medium circulation unit and the blower unit in a first cooling mode, when a drive force for the vehicle is in a first operational region, and controls in a second cooling mode that provides a higher cooling capability than the first cooling mode, when the drive force for the vehicle is in a second operational region that is higher than the first operational region.