Electronic Controller Shifting Restriction for Human-Powered Vehicle
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Solution Overview
Problem
Riders of human-powered vehicles often experience awkwardness due to unintended shifting of the transmission device when the control state of the motor changes, which can be caused by various factors such as acceleration, load, and environmental conditions.
Innovation Solution
A human-powered vehicle control device with an electronic controller that restricts shifting of the transmission device until predetermined conditions are met, such as a set period or specific parameters related to the vehicle's state and environment, to maintain a stable transmission state and prevent unwanted shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control state of the motor is changed, then the motor can adapt to different traveling conditions, but the transmission device may shift unintentionally causing rider discomfort
Solution Approach 1:
The electronic controller restricts shifting actions in advance when a control state change is detected, preventing unintended shifting before it occurs. This preliminary restriction ensures that the transmission device remains stable during motor control state transitions, eliminating rider discomfort while maintaining adaptability.
2Productivity
If the transmission device is allowed to shift freely, then the transmission ratio can be optimized for current conditions, but the shifting may occur at inappropriate times causing awkwardness
Solution Approach 1:
The system dynamically adjusts the shifting restriction based on the motor's control state. When the control state changes, shifting is restricted; when the control state is stable, shifting is permitted. This dynamic control allows transmission ratio optimization at appropriate times while preventing awkward shifts during critical transitions.
3Reliability
If the electronic controller restricts shifting immediately after control state change, then unintended shifting is prevented, but the transmission device cannot respond to changing traveling conditions
Solution Approach 1:
The electronic controller implements periodic checking of the control state to determine when to allow or restrict shifting. By monitoring the control state over time and applying restrictions only during specific periods (when control state changes are detected), the system maintains shifting control stability while preserving the ability to respond to traveling conditions during appropriate periods.
Data Source
AI summary
A human-powered vehicle control device is provided for a human-powered vehicle having a transmission device and a motor, which is configured to apply a propulsion force to the human-powered vehicle. The human-powered vehicle control device includes an electronic controller configured to control a transmission device of a human-powered vehicle. The electronic controller is configured to restrict a shifting action of the transmission device until a predetermined condition is satisfied in a case where one of a control states of the motor is switched to a further one of the control states of the motor.