E-bike Controller Dynamic Torque Adjustment
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Solution Overview
Problem
Existing human-powered vehicle control devices do not adequately consider motor assistance when human driving force input increases, leading to inefficient propulsion and power consumption issues.
Innovation Solution
A human-powered vehicle control device with an electronic controller that adjusts the motor's output ratio and upper limit torque based on human driving force input, optimizing motor assistance by changing these parameters within predetermined transmission ratio ranges to enhance propulsion efficiency and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmission ratio is decreased to improve propulsion efficiency, then the motor can assist more effectively, but the rider cannot easily continue propelling the vehicle when human driving force increases
Solution Approach 1:
The patent applies dynamics by making the motor output parameters (output ratio and upper limit torque value) dynamically adjustable based on transmission ratio and human driving force. The electronic controller continuously monitors these parameters and adjusts motor assistance accordingly, allowing the system to adapt to changing riding conditions rather than using fixed parameters
Solution Approach 2:
The patent changes physical parameters of the motor assistance system - specifically the output ratio and upper limit torque value - based on the transmission ratio and detected human driving force. This parameter adjustment allows the motor to provide appropriate assistance levels: higher assistance when transmission ratio is low and human force is insufficient, and reduced assistance when transmission ratio is high and human force is adequate
2Ease of operation
If the motor output ratio and upper limit torque value are increased to assist propulsion when human driving force increases, then the rider can easily continue propelling, but power consumption increases
Solution Approach 1:
The system dynamically changes motor parameters (output ratio and upper limit torque value) based on real-time conditions including transmission ratio and human driving force magnitude. When human driving force exceeds a predetermined threshold, the controller reduces these parameters, thereby lowering power consumption while maintaining ease of propulsion only when necessary
Solution Approach 2:
The electronic controller implements feedback by continuously detecting human driving force and transmission ratio, then adjusting motor output parameters accordingly. This closed-loop control ensures motor assistance is provided only when and where needed, optimizing the balance between ease of operation and power consumption
Data Source
AI summary
A human-powered vehicle control device includes an electronic controller operatively coupled to a motor that assists in propulsion of a human-powered vehicle. The electronic controller is configured to changes at least one of a ratio of output of the motor to a human driving force that is input to the human-powered vehicle or an upper limit value of an output torque of the motor in accordance with the human driving force inputted to the human-powered vehicle upon determining a transmission ratio of the human-powered vehicle is in a predetermined range.