Electric Vehicle Torque Limiting During Brake-Accelerator Overlap
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Solution Overview
Problem
Actuating both the accelerator and brake in electric vehicles can increase wear and tear on the vehicle, particularly in electric powersport vehicles like snowmobiles, due to the buildup of torque when both are engaged.
Innovation Solution
Implementing a controller that manages the electric motor to operate under different torque and power relationships based on concurrent actuation of the accelerator and brake, limiting the output torque and power when both are engaged to mitigate wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If both accelerator and brake are actuated simultaneously to build up torque for higher initial acceleration, then vehicle acceleration performance is improved, but wear and tear on vehicle components increases
Solution Approach 1:
The controller dynamically adjusts the maximum output torque based on the operational state of the accelerator and brake. When both are actuated, the system switches to a second relationship with reduced maximum torque (20-80% of first maximum torque), thereby adapting the torque output to minimize wear while still providing useful acceleration assistance.
Solution Approach 2:
The system changes the torque parameter by implementing two distinct torque relationships. The first relationship allows full maximum torque when only accelerator is actuated, while the second relationship limits torque to a lower maximum when both accelerator and brake are actuated, thus reducing component stress and wear during simultaneous actuation.
2Reliability
If maximum output torque is limited when both accelerator and brake are actuated, then component wear is reduced, but acceleration performance may be compromised
Solution Approach 1:
The system applies partial torque limitation when both accelerator and brake are actuated. Instead of completely preventing torque output, it allows a reduced maximum torque (20-80% of full torque) that provides sufficient acceleration assistance while significantly reducing wear on braking and powertrain components.
Solution Approach 2:
The controller acts as an intermediary between the accelerator and brake systems, mediating the torque output based on their combined state. It introduces a intermediate torque level that balances the competing demands of acceleration performance and component protection, rather than simply choosing between full torque or zero torque.
Data Source
AI summary
Systems and methods for mitigating wear of electric vehicles are provided. A method of operating an electric powersport vehicle includes receiving an accelerator command and driving an electric motor of the vehicle based on whether or not the accelerator command is accompanied by a braking command. When the accelerator command exists at a same time as the braking command, the output of the electric motor is limited to a lower output torque value than when the accelerator command exists at a different time as the braking command.