Two-Wheeler Stability Control via Adaptive Side Slip Thresholds
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Solution Overview
Problem
Motorcycles experience unstable cornering and risk of oversteer due to mismatched speed, steering angle, and road conditions, leading to potential rollover and injury, as existing stabilization methods are not adaptive enough to changing friction coefficients and driving dynamics.
Innovation Solution
A sensor system on the two-wheeler detects critical driving conditions and automatically adjusts torque on vehicle wheels through braking and motor interventions to stabilize the vehicle, using dynamic limit values based on current driving state variables to prevent oversteer and slip, with interventions coordinated by a control device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If driving dynamics control is implemented when side slip angle exceeds threshold, then vehicle stability is improved, but the control system lacks adaptability to changing road conditions and friction coefficients
Solution Approach 1:
The patent implements dynamic threshold values for side slip angle that automatically adapt to changing driving conditions, road surface characteristics, and weather conditions. The control system continuously adjusts the threshold based on sensor inputs including lateral acceleration, yaw rate, and vehicle speed, enabling the stabilization measure to remain effective across varying friction coefficients and environmental conditions rather than using a fixed threshold
Solution Approach 2:
The system employs continuous feedback from multiple sensors (lateral acceleration sensor, yaw rate sensor, vehicle speed sensor) to monitor the actual side slip angle and compare it against dynamically adjusted threshold values. This feedback mechanism allows the control system to detect when the side slip angle approaches the adaptive threshold and automatically apply stabilization measures, creating a closed-loop control system that adapts to changing conditions in real-time
2Reliability
If automatic stabilization intervention is implemented, then driving safety is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The patent integrates the side slip angle control system with existing motorcycle electronic control units and sensor infrastructure. The control algorithm utilizes data from sensors already present in modern motorcycles (acceleration sensors, yaw rate sensors, vehicle speed sensors) and leverages existing electronic throttle control and brake control systems, thereby achieving enhanced safety functionality while minimizing additional hardware complexity
Solution Approach 2:
The control system automatically detects critical driving conditions and implements stabilization measures without requiring driver input or additional complex intervention systems. The electronic control unit autonomously processes sensor data, determines when stabilization is needed based on adaptive threshold comparisons, and executes appropriate countermeasures such as engine torque reduction or brake application, making the system self-regulating and reducing the need for complex manual control interfaces
Data Source
Figure 1
AI summary
In a method for stabilizing a two-wheeled vehicle, the current side slip angle is compared to an associated limit value which is determined in accordance with at least one current driving condition variable.