Human-Powered Vehicle Control Device Motor Synchronization
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Solution Overview
Problem
Existing human-powered vehicle control devices lack improved usability, particularly in switching between modes and energy efficiency during changes in rotational speed ratio and transmission stage.
Innovation Solution
A human-powered vehicle control device with an electronic controller that adjusts motor control based on the rotational speed ratio and transmission stage, stopping or reducing motor output when the state changes, and storing these states for efficient shifting and user-friendly operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor control is continuously adjusted based on human driving force, then the propulsion assistance is improved, but the energy consumption increases
Solution Approach 1:
The motor control is activated periodically based on transmission state changes rather than continuously. The electronic controller turns motor control on or off according to whether the transmission is in a first state (enabling motor control) or second state (disabling motor control), creating a periodic control pattern that reduces energy consumption while maintaining necessary propulsion assistance.
Solution Approach 2:
The system changes the control parameter of the motor from continuous adjustment to state-based discrete control. By monitoring transmission state parameters (first state vs. second state) and adjusting motor control accordingly, the system optimizes energy usage while maintaining effective propulsion assistance when needed.
2Use of energy by moving object
If the motor control is stopped when transmission state changes, then the energy is saved, but the shifting smoothness may be affected
Solution Approach 1:
The electronic controller is configured to stop motor control in advance when a transmission state change is detected (transition to second state), and resume motor control when the transmission returns to the first state. This preliminary action of stopping motor control before or during shifting operations prevents interference with the shifting mechanism while maintaining energy efficiency, and ensures smooth resumption of motor assistance after shifting completes.
3Ease of operation
If the motor output is decreased during transmission state change, then the shifting is facilitated, but the propulsion force is reduced
Solution Approach 1:
The motor output is periodically adjusted based on transmission state. During shifting operations (when transmission is in second state), motor control is stopped or output is decreased, facilitating smooth shifting. When transmission returns to first state, motor control is resumed and normal propulsion force is restored, creating a periodic pattern of force adjustment that balances shifting facilitation with propulsion maintenance.
Data Source
AI summary
A human-powered vehicle control device includes: an input rotary body to which a human driving force is input; a driving wheel driven by rotating the input rotary body; a transmission configured to change a ratio of a rotational speed of the driving wheel to a rotational speed of the input rotary body; a motor that assists in propulsion of the human-powered vehicle; and an electronic controller configured to control the motor. The electronic controller controls the motor in accordance with the human driving force in a case where one of the rotational speed ratio and a transmission stage of the transmission is in a first state, and stops the control of the motor in accordance with the human driving force in a case where one of the rotational speed ratio and the transmission stage is in a second state different from the first state.