BEV Torque Split Control for Stability on Inclined Surfaces
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Solution Overview
Problem
Electric vehicles (BEVs) face challenges in maintaining stability on inclined surfaces due to unique torque control capabilities, which existing systems have not effectively harnessed for enhanced stability on off-road conditions.
Innovation Solution
A vehicle control system that includes a sensor network and a controller to determine vehicle attitude and modify torque application based on the center of gravity's movement relative to the vehicle's axis of rotation, using a lookup table to define stability thresholds and adjust torque split between front and rear axles or apply EPAS torque to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If torque application is increased to improve tractive capability on inclined surfaces, then propulsion performance is improved, but vehicle stability deteriorates due to center of gravity movement
Solution Approach 1:
The control system continuously monitors vehicle attitude information from sensors and uses this feedback to dynamically adjust torque application. The controller determines center of gravity movement relative to the axis of rotation and modifies torque split between front and rear axles accordingly, creating a closed-loop control system that maintains stability while preserving tractive capability.
Solution Approach 2:
The system dynamically adjusts torque distribution between front and rear axles based on real-time vehicle attitude and center of gravity position. Rather than using fixed torque split, the controller continuously adapts the torque application to changing vehicle conditions on inclined surfaces, optimizing both propulsion and stability.
2Stability of the object's composition
If torque split is adjusted to maintain stability, then vehicle stability is improved, but propulsion efficiency deteriorates
Solution Approach 1:
The controller modifies torque application parameters dynamically based on vehicle attitude and center of gravity position. By changing torque split ratios between front and rear axles according to real-time conditions, the system optimizes the balance between stability maintenance and propulsion efficiency, avoiding excessive energy consumption while preventing wheelie or roll conditions.
3Stability of the object's composition
If EPAS torque is applied to prevent roll conditions, then lateral stability is improved, but steering responsiveness deteriorates
Solution Approach 1:
The control system applies EPAS torque in advance to counteract potential roll conditions before they fully develop. By detecting vehicle attitude changes and center of gravity movement early, the system preemptively applies steering torque to maintain lateral stability, while the continuous monitoring ensures steering responsiveness is preserved through dynamic adjustment.
Data Source
AI summary
A vehicle control system may include a sensor network sensing vehicle attitude information and a controller operably coupled to the sensor network to determine, based on the vehicle attitude information, movement of a center of gravity of the vehicle relative to an axis of rotation of the vehicle. The controller may further determine a modification to a torque application of the vehicle based on the movement of the center of gravity of the vehicle relative to the axis of rotation of the vehicle.