Dual-Motor Power Allocation Using Temperature Rise Feedback
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Solution Overview
Problem
Existing dual-motor drive systems in electric vehicles face poor dynamic quality due to improper power allocation, especially when high power is required, leading to overheating and reduced performance.
Innovation Solution
A power allocation method that adjusts the output powers of two motors based on their current temperatures and temperature rise rates, using correction factors to maintain equal temperatures and ensure dynamic balance, while calculating heat exchange quantities and copper losses to optimize power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the required power exceeds the sum of rated powers of two motors, then the vehicle can meet high power demands, but the motor temperature increases too quickly causing poor dynamic quality
Solution Approach 1:
The patent implements dynamic power allocation that adjusts motor power distribution in real-time based on temperature feedback. The control system continuously monitors motor temperatures and dynamically adjusts the power allocation between motors, transitioning from static rated power distribution to adaptive dynamic control, thereby preventing temperature runaway while meeting high power demands
Solution Approach 2:
The patent employs temperature feedback mechanisms where motor temperature data is fed back to the control system, which then adjusts power allocation accordingly. This closed-loop feedback control ensures that when one motor approaches temperature limits, its power output is reduced while the other motor compensates, maintaining overall vehicle power requirements while preventing thermal damage
2Loss of energy
If torque is distributed to maximize motor efficiency sum, then energy economy is improved, but dynamic quality cannot be met when high power is required
Solution Approach 1:
The control system transitions from static efficiency-optimized torque distribution to dynamic power allocation that adapts to real-time temperature conditions. When temperature limits are approached, the system dynamically rebalances power distribution away from pure efficiency optimization toward thermal management priorities, ensuring both energy economy and dynamic performance are maintained under varying operating conditions
Solution Approach 2:
The patent changes the control parameters from fixed efficiency-based torque distribution ratios to dynamic power allocation ratios that incorporate temperature as a key parameter. By introducing temperature-dependent modulation factors, the system adjusts power distribution to balance both energy efficiency and thermal constraints, thereby maintaining dynamic quality under high power demands
3Power
If one motor operates at high power to meet vehicle demands, then power requirements are met, but that motor overheats reducing reliability
Solution Approach 1:
The patent segments the power delivery function between two motors, allowing the power system to divide high power demands across multiple motor units. When one motor approaches thermal limits, the system redistributes its load segment to the other motor, preventing any single motor from overheating while collectively meeting the vehicle's total power requirements, thereby maintaining system reliability
Solution Approach 2:
The control system implements beforehand cushioning by proactively monitoring motor temperatures and preemptively adjusting power allocation before thermal damage occurs. When temperature thresholds are approached, the system提前 (in advance) reduces power to the at-risk motor and redistributes load, preventing overheating and potential failure before they can occur, thus maintaining motor reliability
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 method ensures the dynamic quality of the vehicle by preventing overheating, maintaining motor balance, and safely meeting driving demands under extreme conditions, providing a more reasonable and effective power allocation.
Implementation Method 1
a formula for calculating a heat exchange quantity Q e of a cooling system of any motor in the current state is: where Q q1 is a temperature at a cooling water inlet of the motor, Q q2 is a temperature at a cooling water outlet of the motor
Implementation Method 2
permanent magnet synchronous motor has advantages of large starting torque and high energy conversion rate
Implementation Method 3
A permanent magnet synchronous motor has advantages of large starting torque and high energy conversion rate
Data Source
Figure 1
AI summary
A power allocation method of a bi-electric system and a vehicle. When the required power of the vehicle is relatively high and greater than the sum of the rated powers of two motors, the temperature rise rate is introduced to correct output powers of the two motors, and then the powers are allocated and output. This not only ensures the dynamic quality of the vehicle, but also prevents a dynamic quality decline of the vehicle caused by overheating ahead of time in one of the motors, thereby ensuring the dynamic balance of the two motors under extreme conditions. This power allocation manner is more reasonable, and can ensure safety while meeting driving needs.