Adaptive Shifting Control for Human-Powered Vehicle Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing human-powered vehicle control systems fail to optimally manage transmission ratios and motor assistance levels based on dynamic riding conditions, leading to inefficient energy transfer and rider comfort.
Innovation Solution
A human-powered vehicle control device with an electronic controller that adjusts transmission ratios and motor assistance levels by detecting converging reference values related to rotational speed, torque, and kinetic states, allowing for adaptive shifting conditions to enhance energy efficiency and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmission device uses fixed shifting conditions, then the structure is simple, but the energy transfer efficiency is low and rider comfort is poor
Solution Approach 1:
The patent implements dynamic shifting conditions that automatically adjust based on real-time detection of riding states (cadence, torque, power output). The control device monitors multiple parameters and dynamically modifies transmission ratio and motor assistance level to match current riding conditions, transforming a static system into a dynamic adaptive one that optimizes energy transfer efficiency without requiring complex manual intervention
Solution Approach 2:
The system employs feedback control by detecting actual riding states through sensors (cadence sensor, torque sensor, power meter) and using this information to adjust transmission and motor assistance levels. The detected values are fed back to the control device which modifies operating parameters accordingly, creating a closed-loop system that continuously optimizes performance based on real-time conditions
2Ease of operation
If the motor assistance level is fixed, then the system is simple to control, but the rider comfort and energy efficiency are reduced
Solution Approach 1:
The motor assistance level is dynamically adjusted based on detected riding states rather than remaining fixed. The control device modifies assistance level in response to changes in cadence, torque, and power output, allowing the system to automatically optimize energy distribution between human input and motor assistance, thereby reducing energy loss while maintaining operational simplicity
Solution Approach 2:
The system changes operating parameters (motor assistance level, transmission ratio) based on detected riding conditions. By varying these parameters in response to real-time data from sensors, the system adapts to different riding scenarios and optimizes energy efficiency without requiring complex user control mechanisms
3Productivity
If the transmission ratio is not adaptively adjusted, then the mechanism is simple, but the energy transfer efficiency and performance optimization are limited
Solution Approach 1:
The transmission ratio is dynamically adjusted based on real-time detection of riding states including cadence, torque, and power output. The control device monitors multiple parameters and automatically modifies transmission ratio to optimize energy transfer efficiency, transforming the transmission system from a static mechanism to a dynamic adaptive system that responds to changing riding conditions
Solution Approach 2:
The control device performs multiple functions by monitoring various riding parameters (cadence, torque, power output) and using this information to simultaneously control both transmission ratio and motor assistance level. This multi-functional approach optimizes performance across different riding scenarios while managing system complexity through integrated control
Data Source
AI summary
A human-powered vehicle control device is provided for controlling a human-powered vehicle. The human-powered vehicle control device includes an electronic controller that controls a human-powered vehicle component in accordance with a control state including first and second modes. The electronic controller changes a transmission ratio of a transmission device in accordance with a first shifting condition in the first mode, and changes the transmission ratio in accordance with a second shifting condition in the second mode. The electronic controller changes the first shifting condition in accordance with a converging reference value, which is related to a traveling state of the human-powered vehicle, for a case where the human-powered vehicle is in a riding converging state in the first mode, and changes the second shifting condition in accordance with a converging reference value for a case where the human-powered vehicle is in the riding converging state in the second mode.