Bicycle Steering Ratio Adjustment for Standing Pedal Stability
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Solution Overview
Problem
Existing bicycle systems do not effectively manage the handlebar angle and steering angle ratio, particularly during situations where cyclist safety is less critical, such as when pedaling out of the saddle, which can lead to instability and energy inefficiency.
Innovation Solution
A method and device that detect when a cyclist is pedaling out of the saddle and adjust the predetermined ratio between the handlebar angle and steering angle using an actuator, either increasing or reducing the steering angle relative to the handlebar angle, based on detected conditions like speed, torque, and inclination, to maintain stability and reduce energy expenditure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the cyclist pedals out of the saddle, then more power can be applied to the pedals, but the bicycle becomes unstable and wobbles
Solution Approach 1:
The patent applies dynamics by making the steering ratio adjustable rather than fixed. The system dynamically changes the steering ratio based on detected cycling conditions (standing vs. seated pedaling). When standing pedaling is detected, the system adjusts the steering ratio to reduce handlebar sensitivity, thereby stabilizing the bicycle while maintaining the ability to apply high power to the pedals.
2Speed
If the steering angle is increased to improve maneuverability, then the bicycle responds more quickly to handlebar input, but the bicycle becomes more sensitive to handlebar movements causing instability when standing on pedals
Solution Approach 1:
The system dynamically adjusts the steering ratio based on the detected pedaling position. When the cyclist is seated, a higher steering ratio provides quick response and good maneuverability. When standing on the pedals, the system reduces the steering ratio to dampen handlebar sensitivity and reduce wobbling, thus maintaining stability while still allowing effective steering control.
3Device complexity
If a fixed steering ratio is used, then the system is simple, but the bicycle cannot adapt to different pedaling styles and conditions
Solution Approach 1:
The patent implements a dynamic steering ratio system that automatically adapts to different pedaling conditions. A sensor detects whether the cyclist is seated or standing on the pedals, and based on this detection, the system automatically adjusts the steering ratio accordingly. This provides adaptability to different cycling styles and conditions while maintaining relatively simple operation for the cyclist.
Solution Approach 2:
The system performs self-adjustment based on automatic detection of the cyclist's position. The sensor continuously monitors whether the cyclist is seated or standing, and the control system automatically modifies the steering ratio without requiring manual input from the cyclist. This self-service approach maintains adaptability while keeping the interface simple.
Data Source
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AI summary
The invention describes a method (80) for setting a predetermined ratio between the handlebar angle (β) and the steering angle (α) of a front wheel (320) of a bicycle (400). In a first method step, a standing pedaling motion (30) is detected, and the predetermined ratio between the handlebar angle (β) and the steering angle (α) is then set depending on the detected standing pedaling motion (30) by means of an actuator (200, 300) arranged on a handlebar (330) of the bicycle (400). The invention also describes a device (301) configured for carrying out the method according to the invention and a bicycle (400) comprising the device (301).