Bicycle Seat Post Pressure Control for Faster Saddle Adjustment
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Solution Overview
Problem
Current bicycle seat post systems have slow reaction times due to design limitations in internal fluid flow components, making it inefficient to adjust saddle height during riding.
Innovation Solution
A seat post assembly with a pressure sensor and controller that uses a valve isolator to manage fluid pressure between chambers, allowing for precise and rapid adjustment of saddle height based on measured pressures, including a hydraulic and pneumatic system for improved responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If manual operation or hydraulic assist mechanism is used for seat post height adjustment, then the saddle height can be adjusted during riding, but the reaction time is slow due to design limitations in internal fluid flow components
Solution Approach 1:
The seat post is divided into multiple tubes (first tube, second tube, third tube) with separate chambers (first chamber, second chamber, third chamber) that can be independently controlled. This segmentation allows for more efficient fluid flow management and faster response time compared to traditional single-chamber designs.
Solution Approach 2:
A valve with an isolator is introduced as an intermediary component to control fluid flow between chambers. The isolator can selectively block or allow fluid passage, enabling rapid and precise control of height adjustment without complex internal fluid flow paths.
2Measurement precision
If a valve isolator is used to control fluid flow between chambers, then precise and rapid height adjustment is achieved, but the system complexity increases with additional components
Solution Approach 1:
The valve isolator is designed to automatically respond to pressure changes detected by the pressure sensor. When the pressure sensor detects a pressure difference between chambers, the isolator automatically opens or closes to equalize pressure, eliminating the need for complex external control mechanisms while maintaining high positioning precision.
Solution Approach 2:
A pressure sensor provides continuous feedback on the pressure within the chambers to the valve isolator. This feedback loop enables the isolator to make real-time adjustments to fluid flow, ensuring precise positioning of the saddle while simplifying the overall control system through automatic response.
3Reliability
If pressure sensor and controller are added to manage fluid pressure, then repeatable positioning is improved, but the device complexity and cost increase
Solution Approach 1:
The pressure sensor and controller work together to create a self-regulating system that automatically maintains the desired pressure differential between chambers. The system monitors pressure continuously and makes automatic adjustments via the valve isolator, ensuring repeatable positioning without requiring complex external control systems or user intervention.
Solution Approach 2:
The electronic pressure sensing and control system replaces traditional mechanical adjustment mechanisms. Instead of manual operation or complex hydraulic controls, the system uses electronic pressure detection and automated valve control to achieve reliable, repeatable positioning with simpler overall system architecture.
4Stability of the object's composition
If the isolator closes the flow path to prevent relative movement, then height stability is improved, but the system becomes less adaptable to height changes
Solution Approach 1:
The valve isolator is designed with dynamic control capability, allowing it to switch between closed and open states based on real-time pressure feedback from the sensor. This dynamic behavior enables the system to maintain height stability when needed while rapidly adapting to height changes when required, providing both stability and versatility.
Solution Approach 2:
The pressure sensor provides continuous feedback that enables the isolator to intelligently control the flow path. When pressure differential indicates stable positioning, the isolator closes to maintain height stability. When pressure changes indicate need for adjustment, the isolator opens to allow fluid flow and height change, thus adapting to different riding conditions.
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 system provides accurate, repeatable positioning of the saddle relative to the bicycle frame, preventing unwanted height changes and enhancing rider comfort by allowing for quick and precise adjustments.
Implementation Method 1
a pressure sensor configured to measure a pressure of a fluid within the first chamber or the second chamber
Implementation Method 2
The isolator is configured to move between a closed position closing the flow path and an open position opening the flow path between the first chamber and the second chamber
Implementation Method 3
The compressible gas has a preloaded pressure, such that when the distance between the first distal end of the first tube and the second distal end of the second tube along the tube axis is at a minimum and the isolator is moved from the closed position to the open position, the preloaded pressure causes the relative movement between the first tube and the second tube
Implementation Method 4
An incompressible fluid is disposed within the first chamber and the second chamber
Data Source
AI summary
A seat post assembly includes a seat post that is electrically adjustable in height. The adjustability may be based on one or more pressures sensed by one or more sensors within the seat post assembly, respectively. The disclosed seat post assembly includes an electronics module. The electronics module may be carried under the seat or saddle and may include a pressure sensor or pressure sensor circuitry.