In-Hub and Axle Drive Control for EV Packaging and Traction
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Solution Overview
Problem
Current electric vehicle drive systems face inefficiencies and increased packaging requirements, limiting range and performance while compromising on cargo and passenger space.
Innovation Solution
A combined axle and in-hub drive system with a centralized control system that dynamically allocates power between traction motors and in-hub motors, enabling efficient power distribution and adaptive torque control for enhanced performance and traction management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional electric vehicle drive system is used, then the vehicle can achieve basic propulsion, but the drive train packaging increases, reducing cargo and passenger space
Solution Approach 1:
The drive system is segmented into two independent motor units: a central traction motor and distributed in-hub motors. This segmentation allows each motor to be independently controlled and positioned, enabling flexible packaging that minimizes space requirements while maintaining propulsion capability.
Solution Approach 2:
The in-hub motors serve multiple functions: they provide propulsion torque, act as regenerative braking systems, and enable independent wheel control for traction management. This multi-functionality reduces the need for separate mechanical components, thereby minimizing drive train packaging.
2Productivity
If more motors are added to improve performance and efficiency, then vehicle capability increases, but the system complexity and packaging requirements increase
Solution Approach 1:
The control system dynamically allocates power between the central traction motor and in-hub motors based on real-time driving conditions, traction requirements, and efficiency optimization goals. This dynamic power distribution enables the system to adapt its complexity level to match actual performance needs.
Solution Approach 2:
The system incorporates sensors and controllers that continuously monitor wheel speed, torque requirements, and motor performance. This feedback enables the centralized control system to optimize power distribution in real-time, improving overall vehicle efficiency and performance while managing system complexity through intelligent control algorithms.
3Reliability
If power is distributed to all wheels for improved traction, then vehicle handling improves, but energy consumption increases
Solution Approach 1:
The system applies torque locally at each wheel through independently controlled in-hub motors, allowing traction to be optimized for specific wheels that need it most. This local quality approach ensures that energy is consumed only where necessary for traction improvement, rather than distributing power uniformly to all wheels.
Data Source
AI summary
A vehicle drive system for an electric vehicle having in-hub motors configured to be independently controlled from the main traction motors. The configuration allows for robust control of the vehicle dynamics and behavior by allowing an improved powertrain control. The system also allows the vehicle to achieve better efficiencies.