EV Heat Management Valve Periodic Switching
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Solution Overview
Problem
The existing heat management systems for electric vehicles often reduce the frequency of heat medium circulation between the second heat exchanger and the first heat exchanger, leading to inefficient heat transfer and potential frost formation, which decreases heat exchange efficiency and increases power consumption.
Innovation Solution
A heat management system that includes an oil cooler, converter cooler, first and second heat exchangers, channels, and a channel valve, where a controller periodically switches the channel valve between valve positions to optimize heat transfer between the heat exchangers and outside air, ensuring efficient circulation and defrosting of the first heat exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the channel valve frequently switches to release heat from the power converter and motor, then the heat exchange efficiency improves, but the frequency of heat medium circulation between the second heat exchanger and first heat exchanger decreases
Solution Approach 1:
The control device implements periodic switching of the channel valve between first and second valve positions at predetermined intervals, even when heat release from the power converter or motor is not immediately required. This periodic action maintains the circulation frequency of the heat medium between the second heat exchanger and first heat exchanger, preventing frost formation while still allowing heat exchange to occur at appropriate moments.
2Temperature
If the channel valve selects the first valve position to release heat, then the temperature regulation improves, but frost formation occurs on the first heat exchanger
Solution Approach 1:
The control device switches the channel valve between first and second valve positions periodically at predetermined intervals. This periodic switching prevents the heat exchanger surface temperature from remaining too low for extended periods, thereby preventing frost formation while still achieving effective temperature regulation when needed.
Solution Approach 2:
The system converts the potential harm of frequent valve switching (which would cause frost formation) into a benefit by implementing periodic switching that maintains circulation frequency. The periodic action ensures the heat medium continues to flow through the second heat exchanger and first heat exchanger, using the circulation itself as a protective mechanism against frost while still enabling heat release when required.
3Loss of energy
If the channel valve selects the second valve position for heat pump mode, then the heat transfer from outside air improves, but the heat medium circulation frequency decreases leading to frost formation
Solution Approach 1:
While operating in heat pump mode with the channel valve in the second valve position, the control device periodically switches to the first valve position at predetermined intervals and then returns to the second valve position. This periodic interruption maintains the circulation frequency of the heat medium, preventing frost formation on the first heat exchanger while still achieving effective heat transfer from outside air during the majority of the time.
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 enhances the frequency of heat medium circulation between the second heat exchanger and the first heat exchanger, reduces frost formation, and maintains efficient heat exchange, thereby improving the overall heat management and reducing power consumption in electric vehicles.
Implementation Method 1
a first heat exchanger configured to exchange heat between the first heat medium and outside air
Implementation Method 2
a second heat exchanger configured to exchange heat between second heat medium for an air conditioner of a cabin and the first heat medium
Implementation Method 3
an oil cooler configured to cool oil by first heat medium. The oil is used to cool a traction motor
Implementation Method 4
a converter cooler configured to cool a power converter configured to supply electric power to the traction motor by the first heat medium
Data Source
AI summary
A heat management system disclosed herein is used for an electric vehicle. The heat management system may comprise an oil cooler, an oil pump, a converter cooler, a first heat exchanger, a second heat exchanger, a first channel, a second channel, a channel valve, a bypass channel, and a controller. While executing the heat pump mode, the controller may be configured to periodically execute an operation of: switching the channel valve from the second valve position to the first valve position and activating the oil pump; and returning the channel valve from the first valve position to the second valve position and inactivating the oil pump in response to a predetermined time having passed.