EV Drive Motor Cooling Control via Navigation Prediction
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Solution Overview
Problem
Conventional cooling methods for electric vehicle drive motors are inefficient during sudden changes in vehicle speed, leading to residual heat buildup during deceleration and insufficient cooling during acceleration, which reduces motor efficiency and increases energy consumption.
Innovation Solution
A method of cooling control that predicts changes in driving speed using a navigation system to temporarily increase the output of the cooling apparatus before deceleration or acceleration, with specific supercooling steps to manage heat effectively during these transitions, ensuring efficient cooling even at low or high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the output of the cooling apparatus is controlled to be in proportion to vehicle speed, then energy consumption is reduced during steady-state driving, but cooling efficiency deteriorates during sudden speed changes
Solution Approach 1:
The navigation system predicts upcoming curved sections or straight sections in advance, and the cooling apparatus is activated at higher output levels before the vehicle actually enters these sections. This preliminary cooling action removes residual heat during predicted deceleration (curved sections) and pre-cools the motor during predicted acceleration (straight sections), ensuring cooling efficiency is maintained during sudden speed changes while avoiding continuous high-power operation.
2Loss of energy
If the cooling apparatus output is dramatically decreased during vehicle deceleration, then energy consumption is reduced, but residual heat removal capability deteriorates
Solution Approach 1:
When the navigation system predicts a curved section ahead (indicating upcoming deceleration), the cooling apparatus is operated at a higher output level in advance. This preliminary cooling action removes residual heat from the drive motor before deceleration occurs, preventing heat buildup that would otherwise require dramatic cooling output increases during the deceleration event itself.
3Reliability
If the output of the cooling apparatus is increased during sudden acceleration, then cooling efficiency is improved, but energy consumption increases
Solution Approach 1:
When the navigation system predicts a straight section ahead (indicating upcoming acceleration), the cooling apparatus is activated at higher output levels before the acceleration event. This pre-cooling action reduces the thermal load on the motor during subsequent acceleration, allowing the cooling system to operate at lower power levels during the actual acceleration while still maintaining adequate cooling 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 enhances cooling efficiency during sudden speed changes, minimizing energy consumption by optimizing cooling apparatus output based on road geometry, thereby maintaining drive motor efficiency and reducing overheating risks.
Implementation Method 1
a water-cooled cooling apparatus using an electric water pump (EWP), and an air-cooled cooling apparatus using a pulse-width modulation (PWM) cooling fan are used as the cooling apparatus
Data Source
AI summary
A method of cooling control for a drive motor of an electric vehicle is disclosed. The method includes controlling an output of a cooling apparatus for cooling the drive motor of the electric vehicle, using a navigation system to predict a deceleration followed by an acceleration in the driving speed of the electric vehicle, temporarily operating the cooling apparatus at a higher output to cool residual heat of the drive motor prior to beginning of the predicted deceleration, and temporarily operating the cooling apparatus at a higher output to cool the drive motor when the acceleration is predicted.