Dual Electric Drive Torque Control for Thermal Load Balancing
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Solution Overview
Problem
Conventional electric vehicles with multiple axles face challenges in efficiently distributing torque between drives to prevent excessive heating and maintain optimal performance.
Innovation Solution
An electric drive apparatus with a control device that monitors the operating temperatures of two drives and dynamically adjusts torque distribution between them based on the driving situation and temperature thresholds, reducing torque on the hotter drive and increasing it on the cooler drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If torque is increased on a drive with high operating temperature, then total torque availability is improved, but the drive temperature increases excessively causing overheating
Solution Approach 1:
The patent implements dynamic torque distribution that continuously adapts to changing operating conditions. The control device monitors operating temperatures of multiple drives and dynamically adjusts torque allocation between them, transitioning from static to dynamic control to prevent overheating while maintaining power output
Solution Approach 2:
The system changes the torque parameter distribution between drives based on temperature conditions. When one drive exceeds temperature thresholds, the control device modifies torque parameters by reducing allocation to the hot drive and increasing allocation to cooler drives, thereby managing temperature while maintaining total power output
2Temperature
If torque is reduced on a drive to prevent overheating, then drive temperature is controlled, but total torque availability decreases
Solution Approach 1:
The patent merges the torque output of multiple drives to maintain total power availability. When one drive must reduce torque due to temperature constraints, other drives compensate by increasing their torque contribution, combining their outputs to achieve the desired total torque while respecting individual temperature limits
Solution Approach 2:
The control device acts as an intermediary that redistributes torque between drives. It mediates between the temperature constraints of individual drives and the total torque requirements of the vehicle, adjusting distribution ratios to balance thermal management with power delivery needs
3Temperature
If torque distribution is dynamically adjusted based on temperature, then thermal management is improved, but control system complexity increases
Solution Approach 1:
The patent implements a feedback control system where the control device continuously monitors operating temperatures of drives and uses this feedback to adjust torque distribution. Temperature sensors provide real-time data to the control algorithm, which automatically modifies torque allocation in response to temperature changes, creating a closed-loop thermal management system
Solution Approach 2:
The control system performs self-adjustment of torque distribution based on temperature feedback without requiring external intervention. The algorithm automatically identifies which drives are overheating and redistributes torque accordingly, enabling the system to self-manage its thermal state while maintaining optimal performance
Data Source
AI summary
The present invention provides an electric drive apparatus (10) for a vehicle (F) comprising a first electric drive (E1), a second electric drive (E2) and a control device (SE), which is connected to the first electric drive (E1) and to the second electric drive (E2) and is designed to ascertain a first operating temperature (T1) of the first electric drive (E1) and a second operating temperature (T2) of the second electric drive (E2) and to control generation of a first torque (M1) on the first electric drive (E1) and/or of a second torque (M2) on the second electric drive (E2) on the basis of a driving situation of the vehicle and/or on the basis of the first operating temperature (T1) and/or on the basis of the second operating temperature (2).