Off-Road Wheel Slip Control Using Terrain-Adaptive Traction Estimation
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Solution Overview
Problem
Existing vehicle driving control technologies fail to adapt to varying road surface conditions, leading to wheel slippage issues on off-road terrains with different characteristics.
Innovation Solution
An apparatus and method that includes a vehicle information receiver, target slippage rate estimation unit, and storage unit to estimate and store optimal slippage rates based on off-road driving information, ensuring maximum traction regardless of terrain type or characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If limited predetermined mode control is used for motor torque, then device complexity is reduced, but adaptability to changing road surface states deteriorates
Solution Approach 1:
The control system dynamically adjusts motor torque based on real-time wheel slippage rate calculations and terrain mode classifications. Instead of using fixed predetermined torque values, the system continuously computes optimal torque by comparing actual wheel speeds with vehicle speed, calculates slippage rates, and adapts control parameters according to the detected terrain type (snowy, icy, sandy, muddy, gravelly), thereby achieving adaptability without excessive complexity
Solution Approach 2:
The system implements feedback control by continuously monitoring wheel speeds, calculating wheel slippage rates, and using this information to adjust motor torque output. The control unit receives feedback on actual vehicle performance and road surface conditions, then modifies torque delivery in real-time to optimize traction while preventing excessive wheel spin, resolving the contradiction between simple control and adaptive performance
2Ease of operation
If fixed motor torque control is applied, then control simplicity is maintained, but wheel slippage control performance on varied terrains deteriorates
Solution Approach 1:
The control system performs self-adjustment by automatically detecting wheel slippage conditions through speed sensor feedback and autonomously modifying motor torque without requiring manual driver intervention. The system classifies terrain modes based on slippage characteristics and self-corrects torque delivery to maintain optimal traction, preserving ease of operation while significantly improving reliability across diverse terrain conditions
Solution Approach 2:
The system changes control parameters (motor torque values) based on detected wheel slippage rates and terrain mode classifications. By dynamically adjusting torque parameters according to actual road conditions rather than using fixed values, the system maintains operational simplicity for the driver while achieving reliable slippage control through automated parameter modification
3Adaptability or versatility
If real-time slippage rate calculation and terrain adaptation is implemented, then adaptability to road conditions is improved, but device complexity increases
Solution Approach 1:
The control system segments terrain conditions into distinct classification categories (snowy road mode, icy road mode, sandy road mode, muddy road mode, gravelly road mode) based on wheel slippage rate characteristics. By dividing the continuous range of road conditions into manageable discrete modes, the system achieves comprehensive terrain adaptability while keeping the control logic organized and complexity manageable through structured classification
Data Source
AI summary
An apparatus for controlling a slippage rate of a vehicle includes: a vehicle information receiver configured to receive off-road driving information of the vehicle, a target slippage rate estimation unit configured to estimate a target slippage rate value, a wheel slippage rate section corresponding to a maximum traction coefficient, using the off-road driving information, and a storage unit configured to store the target slippage rate value.