Dual E-Axle Torque Control Based on Component Damage Condition
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Solution Overview
Problem
Existing electrically driven axles with two electric motors face challenges in maintaining long-term reliability and extending the service life of critical components due to unpredictable damage accumulation from torque and speed conditions.
Innovation Solution
A method and system that monitor and control the damage condition of mechanical and electrical components by determining torque, speed, and temperature inputs, adjusting transmission ratios and power distribution to balance damage conditions and prevent exceeding recommended limits, thereby extending the service life and reducing failure probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric motors operate at high torque and speed to meet power demands, then the power output is improved, but the damage accumulation to mechanical components increases rapidly
Solution Approach 1:
The control system dynamically adjusts the torque distribution between two electric motors based on real-time damage condition monitoring. When one motor's damage condition exceeds a threshold, the system dynamically shifts operational load to the other motor, creating a adaptive, movable operational state that prevents static overload damage accumulation.
Solution Approach 2:
The system changes operational parameters by monitoring damage conditions and adjusting torque allocation. When damage thresholds are reached, the control system modifies the torque parameter distribution between motors, switching from equal torque distribution to asymmetric distribution that accounts for component wear states.
2Duration of action of stationary object
If the damage condition monitoring and adaptive control system is implemented, then the service life of mechanical components is extended, but the device complexity increases
Solution Approach 1:
The system implements feedback control by continuously monitoring damage conditions of mechanical components and using this information to adjust torque distribution. The damage condition serves as feedback signal that triggers control actions, creating a closed-loop system that adapts to component wear without requiring complex predictive models.
Solution Approach 2:
The control system performs self-adjustment based on monitored damage conditions, automatically redistributing torque loads without external intervention. The system serves itself by using its own operational data to make control decisions, reducing the need for external maintenance scheduling or manual adjustments.
3Ease of operation
If the torque is distributed equally between two electric motors, then the control simplicity is maintained, but the damage condition balance between power transmission paths deteriorates
Solution Approach 1:
The torque distribution transitions from a static equal-split strategy to a dynamic adaptive strategy. The control system continuously evaluates damage conditions and adjusts torque allocation in real-time, making the distribution movable and responsive to component states rather than fixed.
Solution Approach 2:
The system changes the torque parameter distribution from equal to asymmetric based on damage conditions. When one power transmission path shows higher damage accumulation, the control system modifies the torque parameter allocation to reduce load on that path, creating parameter variation that balances damage rates.
Data Source
AI summary
The present invention relates to a method (100) for controlling one or two electrically driven axles (1a, 1b) of a vehicle with electric motors (EM1, EM2), each connected to an output (2, 2a, 2b) via a respective power transmission path (3, 4), comprising the following steps: determining (101a) values for a speed and a torque applied to at least one mechanical component (5) of the power transmission paths (3, 4) and/or the electric motors (EM1, EM2); determining a value of a damage condition of the at least one mechanical component (5) resulting from damage inputs over a predefined period of time; and controlling (107) the electrically driven axles (1a, 1b) taking into account the damage condition of the at least one mechanical component (5).