E-Bike Motor Control Device Response Speed Adjustment
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Solution Overview
Problem
Existing human-powered vehicle control devices do not adequately adjust motor assistance based on varying traveling conditions, such as crank rotation and vehicle speed, leading to inefficient propulsion.
Innovation Solution
An electronic controller that switches between two control states to adjust the motor's response speed and output ratio relative to human drive force, with distinct predetermined periods for each state, ensuring suitable motor control according to the traveling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor output ratio to human drive force is increased in the second control state, then the motor assistance is enhanced, but the response speed becomes slower
Solution Approach 1:
The system dynamically adjusts the motor response speed based on the selected control state. In the first control state, the motor responds quickly to human drive force changes, while in the second control state, the motor response is deliberately slowed down. This dynamic adjustment of response characteristics allows the system to optimize between rapid response and smooth power delivery depending on the operating conditions and selected mode.
Solution Approach 2:
The electronic controller changes the response speed parameter of the motor based on the control state selection. When switching between first and second control states, the controller modifies the response speed parameter to achieve different motor assistance characteristics - faster response in the first state and slower, smoother response in the second state, thereby resolving the contradiction between power output and response speed.
2Speed
If the motor response speed is increased for faster reaction to human drive force, then the responsiveness is improved, but the motor output increases abruptly rather than smoothly
Solution Approach 1:
The system employs dynamic response speed adjustment where the motor response characteristic is changed based on the control state. In the second control state, the motor response speed is deliberately reduced to ensure smooth power delivery. This dynamic parameter adjustment prevents abrupt output changes while maintaining appropriate responsiveness to human drive force variations.
Solution Approach 2:
The electronic controller modifies the motor response speed parameter according to the selected control state. By changing this parameter, the system achieves smooth motor output in the second control state while maintaining faster response in the first control state, thereby resolving the contradiction between responsiveness and output smoothness.
Data Source
AI summary
A human-powered vehicle control device includes an electronic controller that controls a motor used to assist in propulsion of a human-powered vehicle. The electronic controller is selectively settable to a first control state that controls the motor in accordance with human drive force and a second control state that controls the motor in accordance with human drive force so that a ratio of an output of the motor to the human drive force is greater than that of the first control state. In the first control state, the electronic controller controls the motor so that a response speed of the motor with respect to a change in the human drive force is equal to a first response speed. In the second control state, the electronic controller controls the motor so that the response speed is equal to a second response speed that is slower than the first response speed.