Electric Bicycle Motor Output Control via Rider Weight Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electric bicycles with chainless designs struggle to provide optimal motor output for riders of varying weights, leading to uncomfortable riding experiences due to inconsistent acceleration and hill-climbing abilities.
Innovation Solution
An electric bicycle equipped with a weight sensing unit, motor output controlling unit, and electronic control unit that adjust motor output based on the rider's weight, using pulse width modulation to classify weight into standard, underweight, and overweight modes, and optionally considering road conditions and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single motor output is predetermined according to standard weight, then standard weight riders experience comfortable riding feeling, but riders with different weights experience inconsistent acceleration and hill-climbing performance
Solution Approach 1:
The motor output is made dynamically adjustable based on detected rider weight. The system transitions from a fixed motor output setting to a dynamic control mode where the motor output controlling unit modifies the motor output according to the actual rider weight, enabling the system to adapt to different riding conditions without requiring multiple predetermined settings
Solution Approach 2:
A weight detecting unit provides feedback about the rider's weight to the electronic control unit. This feedback mechanism enables the system to automatically adjust the motor output based on the detected weight, creating a closed-loop control system that optimizes performance for each rider without manual intervention
2Force
If motor output is increased for overweight riders, then hill-climbing ability improves, but energy consumption increases
Solution Approach 1:
The motor output parameter is dynamically changed based on the detected rider weight. The motor output controlling unit adjusts the motor output parameter in real-time according to the actual weight condition, ensuring optimal force output while minimizing unnecessary energy consumption that would occur with fixed high-power settings
3Use of energy by moving object
If motor output is decreased for underweight riders, then energy efficiency improves, but acceleration performance may become insufficient
Solution Approach 1:
The motor output parameter is dynamically adjusted downward for underweight riders based on weight detection feedback. This parameter change ensures that the motor delivers sufficient acceleration performance while avoiding excessive energy consumption that would result from maintaining high power settings designed for heavier riders
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures a consistently comfortable riding experience by adjusting motor output to match the rider's weight, providing appropriate acceleration and hill-climbing performance regardless of the rider's weight, thus enhancing riding sensibility.
Implementation Method 1
a weight sensing unit configured to sense a rider's weight
Implementation Method 2
a motor output controlling unit configured to control a motor driving output
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An electric bicycle and a method of controlling the same are disclosed. The electric bicycle according to one embodiment of the present invention includes a weight sensing unit (53) for sensing a rider's weight; a motor output controlling unit (57) for controlling a motor (34) driving output; and an electronic control unit (50) for varying the motor (34) output through the motor output controlling unit (57) according to the weight sensed by the weight sensing unit (53), and the weight sensing unit (53) classifies the rider's weight into a standard weight mode, an underweight mode, and an overweight mode according to the sensed weight, and if the weight is in the underweight mode, the weight sensing unit (53) reduces the motor (34) output to a value below the motor (34) output for the standard weight mode and if the weight is in the overweight mode, the weight sensing unit (53) increases the motor (34) output to a value above the motor (34) output for the standard weight mode.