Drive Torque Reallocation for Wheel Slip Control in 4WD Vehicles
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Solution Overview
Problem
Existing traction control systems (TCS) struggle to effectively manage excessive drive torque during vehicle acceleration on low-traction surfaces, leading to wheel slipping and compromised safety and comfort.
Innovation Solution
A vehicle control method that detects slipping by comparing vehicle and wheel acceleration/dynamic differences, adjusts drive torque based on road conditions, and implements torque transfer/reallocation to maintain stability and power performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCS system controls drive torque to improve traction, then wheel slip is reduced, but vehicle power performance deteriorates when excessive drive torque is needed for acceleration
Solution Approach 1:
The system dynamically adjusts torque control strategy based on real-time detection of slip conditions. When wheel slip is detected through acceleration differences, the system transitions from normal torque output to limited torque output, and can dynamically reallocate torque to non-slipping wheels, making the torque control adaptive rather than static
Solution Approach 2:
The system applies different torque control strategies to different wheels based on their individual slip conditions. When one wheel slips, the system limits torque to that specific wheel while potentially maintaining or increasing torque to non-slipping wheels, creating localized torque differentiation rather than uniform torque reduction across all wheels
2Stability of the object's composition
If TCS system limits drive torque to prevent wheel slip, then wheel slip amplitude is reduced, but vehicle acceleration performance and safety deteriorate
Solution Approach 1:
The system introduces a torque allocation mechanism that acts as an intermediary between the slipping and non-slipping wheels. When one wheel slips, the system redistributes the torque that would have been applied to the slipping wheel to non-slipping wheels, maintaining overall驱动力 while preventing slip. This torque reallocation serves as a mediator that preserves both slip control and acceleration performance
Solution Approach 2:
The system dynamically switches between different torque control modes based on real-time slip detection. When slip is detected, the system transitions to torque limitation mode for the slipping wheel, and can dynamically reallocate torque to other wheels. This dynamic response ensures safety by adapting to changing road conditions rather than using fixed torque limits
Data Source
AI summary
A vehicle control method includes whether a vehicle slips is detected by using a difference between an acceleration of a drive wheel and a traveling acceleration of the vehicle and/or a difference between a speed of the drive wheel and a traveling speed of the vehicle. When the drive wheel slips, drive torque output by a drive apparatus to the slipping drive wheel is controlled to be less than required torque, to ensure safety of the vehicle. Further, a slip rate of the drive wheel and a road condition of a road on which the vehicle is located are used as specific control constraints. When the vehicle is a four-wheel drive vehicle, the control method may further implement transfer and reallocation of drive torque.