Two-Wheel Vehicle Overturn Prevention via Velocity-Based Lean Control
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Solution Overview
Problem
Conventional methods for improving the stability of two-wheeled vehicles do not effectively address traveling instability in the low-velocity region, leading to potential overturns, especially during low-speed turns like U-turns, where small changes in velocity significantly affect the vehicle's balance.
Innovation Solution
A method and device that estimate maximum allowable lean angles based on vehicle body velocities, adjust engine drive force to prevent overturning by accelerating or decelerating the vehicle, using sensors to detect lean and vehicle velocities, and implement PID control to minimize velocity differences, ensuring stability without altering the turning radius.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional engine torque adjustment methods are used to control acceleration during curve travel, then high-velocity stability is improved, but low-velocity region stability deteriorates
Solution Approach 1:
The control method changes the parameter being controlled from engine torque/acceleration to vehicle body velocity directly. By detecting actual velocity and lean angle, and comparing with predetermined threshold values, the system determines whether to increase velocity to prevent overturning. This parameter change allows the system to adapt to both high-velocity and low-velocity conditions, resolving the contradiction where conventional acceleration control works at high speeds but fails at low speeds.
2Reliability
If the vehicle accelerates to maintain stability in low-velocity region, then overturning is prevented, but the driver's intended turning radius may be altered
Solution Approach 1:
The system uses feedback from velocity detection and lean angle detection to determine when acceleration is necessary. By continuously monitoring the actual velocity and comparing it with the predetermined threshold velocity, the system only accelerates when the vehicle is in an unstable low-velocity state. This feedback mechanism allows the system to maintain stability while minimizing interference with the driver's intended turning radius, as acceleration is applied only when necessary for safety.
Solution Approach 2:
The system takes preliminary action by detecting the lean angle and velocity before overturning occurs. When the lean angle exceeds the threshold or velocity is below the threshold, the system proactively increases velocity to prevent the harmful effect of overturning. This preliminary anti-action prevents the need for corrective steering inputs that would alter the driver's intended turning radius.
3Reliability
If maximum allowable lean angles are preset based on velocity, then stability control is improved, but system complexity increases
Solution Approach 1:
The maximum allowable lean angles and threshold velocities are predetermined and stored in the control system before operation. This preliminary preparation of control parameters allows the system to quickly compare actual sensor readings against pre-established safety thresholds without requiring complex real-time calculations. The predetermined values are set based on the relationship between velocity and stable lean angles, enabling simple yet effective stability control.
Data Source
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AI summary
There is provided a two-wheeled vehicle overturn prevention method, wherein maximum allowable lean angles corresponding to vehicle body velocities are preset in relation to lean angles of a vehicle body, and in a case where an actual lean angle of the vehicle body exceeds a maximum allowable lean angle corresponding to an actual vehicle body velocity of the vehicle body or in a case where an estimated lean angle of the vehicle body after a predetermined amount of time exceeds or looks to exceed a maximum allowable lean angle corresponding to an estimated vehicle body velocity, the two-wheeled vehicle overturn prevention method is adapted to accelerate the vehicle body or keep the vehicle body from decelerating.