Bicycle Controller Motor Response Adaptation
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Solution Overview
Problem
Existing bicycle controllers fail to adapt motor response effectively to changes in riding environment, such as speed and inclination, leading to inefficient propulsion assistance.
Innovation Solution
A bicycle controller with an electronic control unit that adjusts motor response speed based on vehicle speed, manual driving force, and inclination angle, using different response profiles for speeds below and above a certain threshold, and for uphill and downhill conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single response speed is used for all vehicle speeds, then the control system is simple, but the motor cannot be optimally controlled for different riding environments
Solution Approach 1:
The patent divides the vehicle speed range into two segments: low speed (≤ first speed) and high speed (> first speed). Different response speeds are assigned to each segment, allowing the motor to be optimally controlled for different riding environments while maintaining manageable system complexity through clear segmentation thresholds.
Solution Approach 2:
The patent implements dynamic adjustment of motor response speed based on real-time vehicle speed conditions. The electronic control unit automatically switches between different response speeds according to whether the vehicle speed is below or above the first speed threshold, enabling the system to adapt to varying riding environments without manual intervention.
2Speed
If high response speed is used at low vehicle speeds, then motor output responds quickly to manual driving force changes, but the system may be overly responsive and less stable at higher speeds
Solution Approach 1:
The patent applies different response characteristics to different operating conditions: a first response speed is used when vehicle speed is low (≤ first speed) to ensure quick motor output response to manual driving force changes, while a second response speed is used when vehicle speed is high (> first speed) to provide more stable and controlled motor assistance. This local optimization of response quality matches the specific needs of each speed regime.
Data Source
AI summary
A bicycle controller controls a motor in accordance with the riding environment of a bicycle. The bicycle controller includes an electronic control unit that is configured to control a motor that assists in propulsion of a bicycle in accordance with a manual driving force. The electronic control unit is further configured to sets a response speed of the motor with respect to a change in the manual driving force for a case in which a vehicle speed of the bicycle is less than or equal to a first speed to be different from the response speed for a case in which the vehicle speed of the bicycle exceeds the first speed.