Bicycle Controller Angular Acceleration Feedback
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Solution Overview
Problem
Bicycle controllers struggle to maintain stability when the wheel slips or spins due to varying road surface conditions, affecting motor torque and bicycle behavior.
Innovation Solution
A bicycle controller with an electronic control unit that reduces motor output based on angular acceleration of the rotary body, including a crankshaft, to detect slipping or spinning, and performs braking or regenerative operations to stabilize the bicycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor output is maintained during wheel slipping or spinning, then the motor can provide continuous propulsion assistance, but the bicycle stability deteriorates due to affected behavior from motor torque
Solution Approach 1:
The electronic control unit continuously monitors angular acceleration of the crankshaft and uses this feedback to detect wheel slipping or spinning conditions. When slipping is detected, the controller automatically adjusts motor output accordingly, creating a closed-loop control system that maintains stability while preserving propulsion assistance when conditions are normal
Solution Approach 2:
The motor output is made dynamic and adjustable based on real-time detection of wheel conditions. The controller modifies the motor's propulsion assistance level in response to detected slipping or spinning, allowing the system to adapt its behavior to current road surface conditions rather than maintaining a fixed output
2Stability of the object's composition
If the motor output is reduced when angular acceleration increases, then the bicycle stability improves, but the propulsion assistance decreases
Solution Approach 1:
The controller changes the motor output parameter dynamically based on the detected angular acceleration threshold. When angular acceleration exceeds the threshold indicating wheel slipping, the motor output parameter is adjusted to a lower level, thereby stabilizing the bicycle while temporarily reducing propulsion power only when necessary
3Measurement precision
If angular acceleration of the crankshaft is used to detect wheel slipping, then the detection accuracy improves, but the device complexity increases due to additional sensing requirements
Solution Approach 1:
The system uses the crankshaft, which is already an integral part of the bicycle's drivetrain, as the sensing element. The crankshaft's inherent rotational motion provides the angular acceleration data needed for detection, eliminating the need for separate sensors or additional measurement devices and thereby maintaining simplicity while achieving accurate slipping detection
Data Source
AI summary
A bicycle controller and bicycle drive device that improves the stability of the behavior of a bicycle. The bicycle controller includes an electronic control unit that reduces the output of a motor, which is configured to assist in propulsion of the bicycle, in accordance with an angular acceleration of a rotary body. The rotary body is included in a human power transmission path extending from an input for human power to a coupling portion coupled to a drive wheel.