Motorcycle Stability Control via Slip and Roll Angle Thresholds
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Solution Overview
Problem
Two-wheeled motor vehicles are particularly susceptible to accidents due to their lateral and transverse tilting, with excessive over- or understeering and low-friction road conditions posing significant risks, as existing systems are not adequately effective in recognizing critical driving situations early enough to prevent or mitigate accidents.
Innovation Solution
A method that involves ascertaining instantaneous slip angles, differential slip angles, and roll angles of the vehicle's wheels and comparing them to predetermined maximum allowable values to generate a criticality signal, which can trigger stabilizing measures or alert other road users, utilizing a control unit equipped with sensors and data processing units to differentiate between stable and unstable driving conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing sensor systems and estimation algorithms are used for two-wheeled motor vehicles, then driving dynamics functions for braking and acceleration are available, but the systems are not adequately effective in recognizing critical driving situations early enough to prevent or mitigate accidents
Solution Approach 1:
The system performs preliminary assessment of driving stability by continuously monitoring slip angles and roll angles before critical situations develop. The control unit compares measured angles against threshold values in advance, enabling early detection and preventive action before accidents occur, thus improving reliability while maintaining adequate response time
Solution Approach 2:
The system implements continuous feedback by monitoring slip angles and roll angles in real-time, comparing them against predetermined threshold values, and automatically triggering stability control measures when thresholds are exceeded. This closed-loop feedback mechanism enables early and reliable detection of critical driving situations with sufficient response time
2Measurement precision
If slip angle thresholds are set to detect all critical situations, then detection sensitivity increases, but false positives increase due to brief instabilities on low-μ patches
Solution Approach 1:
The system performs preliminary assessment by continuously monitoring both slip angle and roll angle thresholds before triggering critical situation detection. This preliminary dual-criterion assessment prevents false positives from brief instabilities on low-μ patches while maintaining high sensitivity for genuine critical situations
Solution Approach 2:
The system dynamically adjusts detection parameters by requiring simultaneous exceedance of both slip angle threshold (α > αmax) and roll angle threshold (Φ > Φmax) to trigger critical situation detection. This multi-parameter approach increases measurement precision while reducing false positives compared to single-threshold methods
3Reliability
If comprehensive monitoring of slip angles and roll angles with multiple threshold comparisons is implemented, then recognition reliability improves, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions using the same sensor inputs: it monitors both slip angle and roll angle thresholds, compares measurements against predetermined values, and triggers stability control measures. This multi-functional approach improves recognition reliability without proportionally increasing device complexity by maximizing the utility of existing sensors and processing units
Data Source
AI summary
A method/control unit for recognizing critical driving situations of a two-wheeled motor vehicle (MV), including: ascertaining an instantaneous slip angle (ISA) and differential slip angle (DSA) of the front/rear wheels; ascertaining an instantaneous roll angle (IRA); comparing the ascertained SAs and DSAs to predetermined values (PV) of maximum allowable slip angles (MASA) or DSAs; comparing the IRA to PVs of a maximum allowable roll angle (MARA); and generating a criticality signal when one of the ISAs is greater than the PV of the MASA, at least one of the instantaneous DSAs is greater than the PV of the maximum allowable DSA, and the IRA is greater than the PV of the MARA. Critical driving situations are recognized with the method, and measures for stabilizing the two-wheeled MV or other safety-enhancing measures may be performed. Special driving situations (driving over low-μ patches or braking while negotiating a curve) may be considered.