Bicycle ABS Control Unit Angular Position Detection
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Solution Overview
Problem
Conventional anti-lock braking systems (ABS) for bicycles face inaccuracies in judging braking states, particularly when the running speed decreases, leading to ineffective engagement and disengagement of braking forces.
Innovation Solution
A method that utilizes a control unit to monitor battery power and the angular position of the brake lever, automatically turning on the ABS when power reaches a set value and the brake lever reaches a set position, and distributing braking forces between the front and rear wheels based on calculated ratios, ensuring accurate operation and engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ABS is turned on automatically based on running speed reduction, then the braking operation can be activated, but false activation occurs when speed reduces without actual braking
Solution Approach 1:
The system uses feedback from multiple sensors (angular sensor detecting brake lever position, running speed sensor) to continuously monitor system state and adjust braking activation decisions. The control unit compares real-time sensor data against threshold values to determine whether to activate ABS, ensuring accurate differentiation between actual braking and simple speed reduction.
Solution Approach 2:
The patent introduces an angular sensor as an intermediary element that detects brake lever position and translates mechanical lever movement into electrical signals for the control unit. This intermediary provides a reliable indicator of rider braking intent, eliminating false activation caused by speed reduction alone.
2Reliability
If the ABS operates without sufficient battery power, then the braking function may fail, but monitoring battery power adds control complexity
Solution Approach 1:
The control unit performs preliminary checking of battery power levels before enabling ABS operation. By monitoring battery voltage in advance and comparing it against a predetermined threshold, the system ensures sufficient power availability before activating the braking system, preventing operation failures due to power insufficiency.
Solution Approach 2:
The system uses the existing battery power supply system to self-monitor its own operational capacity. The control unit utilizes the battery voltage signal already present in the electrical system to determine whether sufficient power is available for ABS operation, without requiring separate dedicated sensing hardware.
3Measurement precision
If the brake lever position is not accurately detected, then the ABS activation timing is incorrect, but simple position detection may not provide sufficient precision
Solution Approach 1:
The patent replaces complex mechanical position sensing mechanisms with an angular sensor that detects the rotational angle of the brake lever. This sensor converts mechanical lever rotation into precise electrical angle signals, providing accurate position detection through electromagnetic or optical fields rather than complex mechanical linkages.
Data Source
AI summary
A method of operating an anti-lock braking system (ABS) of a bicycle comprising steps of: judging whether a power of a battery meets a set value; judging a moved angular position of a brake lever; outputting electric currents to operate the ABS; and judging whether a running speed of the bicycle is zero. When the power meets the set value, the ABS is turned on, and when the power of the battery is low, the ABS is not turned on. After the brake lever is pressed, the control unit judges whether the moved angular position of the brake lever reaches a set position. When the moved angular position does not reach the set position, the ABS is not turned on. When the moved angular angle reaches the set position, the ABS is turned on. The control unit outputs the electric currents to turn on the ABS, thus braking the bicycle.