xEV Torque Vectoring Control for Slippery Road Launch Traction
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Solution Overview
Problem
Current xEV traction control systems face performance limitations when vehicles start or accelerate on slippery roads, leading to rapid control performance reduction due to excessive driving force and tire slipping, which is not effectively managed by existing torque vectoring methods.
Innovation Solution
A method and apparatus that utilize vehicle state estimation and intervention torque control, involving speed sensors, vehicle control units, and torque vectoring motors to detect vehicle speed, determine slip states, and adjust torque distribution to prevent slipping, thereby improving traction control performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque vectoring control is applied to prevent slipping on slippery roads, then traction control performance is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The control system is segmented into distinct functional modules: a vehicle state determination unit that processes sensor data to identify slip conditions, and a torque vectoring control unit that executes corrective torque distribution. This modular segmentation allows the system to achieve reliable traction control while managing complexity through organized functional decomposition.
Solution Approach 2:
The vehicle state determination unit continuously monitors and determines vehicle state information before slipping occurs, enabling predictive intervention. By performing preliminary assessment of wheel slip conditions and vehicle state, the system can proactively apply torque vectoring control to prevent slipping rather than reacting after the fact, improving reliability while optimizing control system efficiency.
2Reliability
If intervention torque control is implemented to reset vehicle speed during slipping, then traction control performance is improved, but ease of operation deteriorates due to automated control intervention
Solution Approach 1:
The system implements continuous feedback by monitoring vehicle state information including wheel speeds and slip conditions. The torque vectoring control unit receives feedback on vehicle state and slip occurrence, automatically adjusting torque distribution to counteract slipping. This closed-loop feedback mechanism improves traction control reliability by dynamically responding to actual vehicle conditions while operating transparently to the driver.
Solution Approach 2:
The control system performs self-service by automatically detecting slip conditions and executing torque vectoring corrections without requiring direct driver intervention. The vehicle state determination unit and torque vectoring control unit work autonomously to maintain traction, allowing the driver to focus on steering and overall vehicle operation while the system handles slip correction independently.
Data Source
AI summary
A method for controlling torque vectoring of an xEV includes detecting vehicle speed information using speed sensors mounted in the xEV, and estimating a vehicle speed of the xEV in driving based on the detected vehicle speed information, setting a state of the xEV based on the estimated vehicle speed, determining whether there is an intervention request based on the set state of the xEV, detecting a steering angle of the xEV when the intervention request is rejected, and when the detected steering angle of the xEV is within a predetermined reference angle range, determining the xEV as being in a first slip state in which the xEV slips in a longitudinal direction, and resetting the vehicle speed of the xEV through output of a torque vectoring (TV) motor mounted in the xEV.