Off-Road Torque Control Using Stuck Probability Feedback
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Solution Overview
Problem
Vehicles often become stuck on off-road surfaces, making it difficult to move them without external assistance, especially for inexperienced drivers.
Innovation Solution
An off-road driving assistance device that determines the stuck state probability of a vehicle and controls the driving torque to prevent the vehicle from becoming stuck, by adjusting the slope of the driving torque or braking torque based on the stuck state probability score.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If driving torque is increased to help vehicle move on off-road surfaces, then vehicle mobility is improved, but vehicle stability deteriorates and risk of becoming stuck increases
Solution Approach 1:
The system dynamically adjusts the slope of driving torque based on real-time stuck state probability assessment. When the vehicle is at risk of getting stuck, the system reduces the rate of torque increase to maintain stability. When the vehicle needs to overcome obstacles, the system increases torque slope to improve mobility. This dynamic adjustment resolves the contradiction between mobility and stability.
Solution Approach 2:
The system changes the parameter of driving torque slope based on vehicle operating conditions and stuck state probability. By adjusting this parameter dynamically, the system optimizes both vehicle mobility and stability, preventing the vehicle from becoming stuck while maintaining progress on off-road surfaces.
2Speed
If driver applies more driving torque to escape stuck state, then vehicle mobility is improved, but vehicle stability deteriorates and vehicle may become more stuck
Solution Approach 1:
The system continuously monitors vehicle state and calculates stuck state probability in real-time. Based on this feedback, the system adjusts the driving torque slope dynamically. When the vehicle shows signs of getting stuck, the system reduces torque increase rate to prevent worsening the stuck state, thereby improving reliability while maintaining mobility when appropriate.
3Reliability
If driving torque is controlled immediately to prevent stuck state, then vehicle reliability is improved, but vehicle responsiveness deteriorates
Solution Approach 1:
The system uses dynamic control where the driving torque slope adjustment depends on real-time assessment of stuck state probability. When the risk is low, the system responds quickly to driver input. When the risk is high, the system modulates the response to prevent getting stuck. This dynamic approach maintains both reliability and responsiveness.
Data Source
AI summary
An off-road driving assistance device may include: a receiver configured to receive driving information of a vehicle; a first controller configured to determine a stuck state probability score based on the driving information; and a second controller configured to control a magnitude of a driving torque or a braking torque based on the driving information and the stuck state probability score. The second controller may be configured to adjust a change in slope of the driving torque or the braking torque based on the stuck state probability score and control the magnitude of the driving torque or the braking torque.