Bicycle Front Wheel Steering Control for Cornering Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bicycles often understeer and lose control when cornering at high speeds or large angles due to front wheel slipping, with existing methods not effectively addressing how to counteract understeering caused by a slipping front wheel.
Innovation Solution
A method and computing unit that monitor and adjust the front wheel's steering to prevent slipping by calculating the actual and limit side slip angles, applying a first rotation to straighten the bike and a second rotation to increase the curve radius, utilizing sensors for speed, inclination, steering angle, grip, and braking force to determine and mitigate slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the bicycle corners at high speed or large angles, then the turning performance is improved, but the front wheel slips and understeer occurs
Solution Approach 1:
The system applies preliminary anti-action by detecting when the actual slip angle approaches the limiting slip angle and generating a compensating steering intervention before complete loss of grip occurs. The computing unit calculates the difference between actual and limiting slip angles, and applies a counteracting steering torque to prevent the front wheel from slipping and understeering during high-speed cornering.
Solution Approach 2:
The system uses feedback by continuously monitoring the actual slip angle through sensors measuring speed, lean angle, and steering angle, comparing it with the pre-determined limiting slip angle, and dynamically adjusting the steering intervention to maintain optimal front wheel grip during cornering maneuvers.
2Reliability
If steering intervention is applied to counteract understeer, then front wheel slip is reduced, but the steering complexity increases
Solution Approach 1:
The system replaces complex mechanical steering stabilization mechanisms with an electronic control system. The computing unit calculates the required steering intervention based on sensor data and slip angle differences, then applies electrical signals to actuators that generate the necessary counteracting steering torque, simplifying the mechanical structure while maintaining cornering stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively stabilizes the bicycle by reducing centrifugal forces and allowing it to maintain a larger turning radius, preventing front wheel slipping and understeering, thus enhancing rider control and safety during cornering.
Implementation Method 1
The limiting slip angle of the front wheel is the angle at which, due to the high centrifugal forces during cornering, the front wheel slips and the bicycle consequently understeers.
Implementation Method 2
The righting of the bicycle is caused by the restoring torque, which counteracts the applied torque to the steering input. This effect occurs due to the trail between the extended steering axis and the wheel contact point.
Implementation Method 3
Righting the bicycle reduces the centrifugal force acting on it during cornering, which is also responsible for the front wheel slipping, allowing the bicycle to continue cornering with a larger radius.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for stabilising cornering of a bicycle, wherein steering interventions on a front wheel of the bicycle are provided for stabilisation. During cornering, a speed is detected by means of a first detection unit (80), an inclination is detected by means of a second detection unit (90), and a steering angle of the bicycle is detected by means of a third detection unit (100). An actual side slip angle and a limit side slip angle of the front wheel are then determined as a function of the detected speed, the inclination and the steering angle of the bicycle by means of a computing unit (70). Then the actual side slip angle is compared with the limit side slip angle of the bicycle by means of the computing unit (70). Then a first rotation of the front wheel towards a curve centre point about a vertical axis of the front wheel is effected by means of an actuator (130) such that the bicycle uprights itself on cornering. Then a second rotation of the front wheel away from the curve centre point about the vertical axis of the front wheel is effected by means of the actuator (130) to stabilise cornering of the bicycle.