EV Drive Wheel Torque Control for Automatic Stack Escape
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Solution Overview
Problem
Existing electric vehicles face difficulty in escaping from a stack during automatic operation due to potential wheel stacking, which can lead to excessive road surface cutting and adverse effects on motor durability.
Innovation Solution
Implementing a control system that switches driving force control from normal to stack-specific control by alternating torque in left and right drive wheels, utilizing rotational driving forces and differences in torque to facilitate escape from stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If driving force control is performed by extending the suspension of driving wheels on the slipping side and grounding the ground, then the vehicle can escape from stack, but the road surface cutting is excessive and motor durability is adversely affected
Solution Approach 1:
The control device changes the torque parameter of the rotating electric machines dynamically. When stacking is detected, the system increases torque to rotate the drive wheels at higher speed, enabling escape from the stacked state. This parameter change allows the vehicle to overcome the stacking condition without excessive road surface cutting or motor damage.
Solution Approach 2:
The system dynamically adjusts driving force distribution between left and right drive wheels based on real-time stacking detection. By making the drive wheels rotate at different speeds through differential torque control, the system enables the vehicle to escape from stacking adaptively, resolving the contradiction between escape capability and component protection.
2Reliability
If the vehicle travels in automatic operation without stack detection control, then normal operation is maintained, but the vehicle cannot escape from stack effectively
Solution Approach 1:
The control device implements a feedback mechanism by detecting whether drive wheels are in a stacked state during automatic operation. When stacking is detected, the system automatically switches to stack escape control mode, adjusting torque to rotate drive wheels at higher speed. This feedback loop ensures both normal operation stability and effective escape capability.
Solution Approach 2:
The vehicle's control system automatically detects and responds to stacking conditions without external intervention. The control device monitors wheel rotation status and autonomously adjusts torque distribution to escape from stacking, enabling the vehicle to self-correct operational issues while maintaining overall system 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
Enhances the vehicle's ability to escape from stacking by reducing road surface cutting and minimizing motor load, thereby improving durability and ease of extraction.
Implementation Method 1
an electric vehicle which includes rotating electric machines that generate rotational driving forces to be applied to a left drive wheel and a right drive wheel
Implementation Method 2
perform, in response to the stack, driving force control for rotating and driving the left drive wheel and the right drive wheel by increasing and decreasing torques generated by the rotating electric machines
Data Source
AI summary
An electric vehicle that has rotating electric machines for generating rotational driving forces to be applied to a left drive wheel and a right drive wheel of the electric vehicle and that travels in an automatic operation, includes a controller to, when determining that at least one of the left drive wheel and the right drive wheel is stacked during traveling in the automatic operation, perform, in response to the stack, driving force control for rotating and driving the left drive wheel and the right drive wheel by increasing and decreasing torques generated by the rotating electric machines.