Vehicle Stability Control Mini-Spare Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The presence of a mini-spare tire in vehicles can lead to inaccurate information for traction control and stability systems, causing unnecessary intervention and poor vehicle acceleration due to the increased wheel speed being misinterpreted as wheel slipping.
Innovation Solution
A method and system that detect the presence of a mini-spare wheel using wheel speed sensors, temporarily adjust threshold values to compensate for the increased speed, and return to original thresholds once recognized, thereby reducing false interventions and improving vehicle acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a mini-spare tire is used instead of a full-size spare tire, then cost and weight are reduced, but wheel speed accuracy deteriorates causing false wheel slip detection
Solution Approach 1:
The system dynamically changes the threshold parameter for wheel slip detection based on detected wheel speed patterns. When a mini-spare is detected (indicated by consistently higher wheel speeds within a specific range), the system adjusts the wheel slip threshold to accommodate the speed differential, preventing false positive detections while maintaining sensitivity to actual slip conditions
Solution Approach 2:
The wheel slip threshold is made dynamic rather than static. The system continuously monitors wheel speeds and automatically adjusts the threshold value in real-time based on whether normal or mini-spare tires are detected, allowing the system to adapt to changing tire configurations without manual intervention
2Reliability
If the wheel slip threshold is lowered to detect actual wheel slipping, then traction control sensitivity improves, but false interventions increase when mini-spare wheels are present
Solution Approach 1:
The system changes the detection threshold parameter dynamically based on wheel speed patterns. When mini-spare tires are detected, the threshold is automatically adjusted upward to account for the inherent speed differential, preventing false interventions. When normal tires are detected, the threshold returns to its original sensitive setting for accurate traction control
Solution Approach 2:
The system uses feedback from continuous wheel speed monitoring to automatically adjust the wheel slip threshold. The controller constantly compares actual wheel speeds against expected ranges and modifies the threshold accordingly, creating a closed-loop system that eliminates false detections while maintaining sensitivity
3Reliability
If the vehicle control system intervenes based on increased wheel speed, then wheel slip correction is achieved, but vehicle acceleration performance deteriorates
Solution Approach 1:
By dynamically adjusting the wheel slip threshold parameter based on tire type detection, the system avoids unnecessary brake actuations and torque reductions that would otherwise occur due to false slip detection. This parameter adaptation eliminates false interventions that would harm acceleration performance while preserving effective intervention for actual slip conditions
Data Source
AI summary
A vehicle stability control system operates by detecting a wheel speed potentially indicative of the presence of a mini-spare wheel at a wheel location of a vehicle with a wheel speed sensor and determines that a mini-spare tire is present responsive to the wheel speed remaining within a predefined band for predefined time. A threshold value that triggers action by a vehicle stability control system is adjusted to provide the mini-spare wheel with a value different than a wheel speed threshold value indicative of wheel slipping for a standard wheel.