Variable Motor Response Control for Human-Powered Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing human-powered vehicle control systems fail to appropriately adjust motor response speed based on varying parameters such as travel resistance, torque, transmission ratio, and load, leading to inefficient propulsion and increased rider load during increased travel loads.
Innovation Solution
A human-powered vehicle control device with an electronic controller that adjusts motor response speed in real-time based on detected parameters like travel resistance, torque, transmission ratio, and load, using a filtering process to optimize motor output and reduce rider load by varying the time constant in the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor response speed is kept constant regardless of travel load parameters, then the control system is simple, but the motor cannot appropriately adjust output leading to increased rider load and inefficient propulsion
Solution Approach 1:
The patent applies dynamics by making the motor response speed variable rather than constant. The electronic controller dynamically adjusts the response speed based on detected parameter values (travel resistance, torque, transmission ratio, load). This allows the control system to adapt to changing travel conditions, improving motor control appropriateness without requiring complex mechanical structures.
Solution Approach 2:
The patent changes the parameter of motor response speed based on detected travel load parameters. When parameters indicate high travel resistance or heavy load, the response speed is adjusted to provide appropriate motor support. This parameter-based control resolves the contradiction by enabling adaptive control through electronic adjustment rather than mechanical complexity.
2Productivity
If the motor response speed is increased for all conditions, then propulsion efficiency improves, but rider load increases during normal conditions
Solution Approach 1:
The patent applies local quality by providing different motor response characteristics for different operating conditions. Instead of a uniform high response speed for all conditions, the controller adjusts response speed locally based on detected parameters. When travel resistance is high or load is heavy, higher response speed provides efficient propulsion support. When conditions are normal, lower response speed prevents excessive rider load, achieving localized optimization.
3Speed
If the motor output changes rapidly, then the system responds quickly to rider needs, but the rider experiences increased load during sudden acceleration
Solution Approach 1:
The patent implements feedback control by continuously detecting travel load parameters (travel resistance, torque, transmission ratio, load) and using this information to adjust motor response speed. The feedback mechanism allows the system to respond appropriately to rider needs while monitoring actual conditions. When sudden acceleration is detected along with high travel resistance, the motor provides supportive output. When acceleration occurs under normal conditions, the feedback ensures motor output changes are moderated to avoid excessive rider load.
Data Source
AI summary
A human-powered vehicle control device includes an electronic controller that controls a motor, which assists in propulsion of a human-powered vehicle in accordance with a human driving force inputted to the human-powered vehicle. The electronic controller is configured to change a response speed of the motor with respect to a change in the human driving force in accordance with a parameter. The parameter includes at least one of a travel resistance of the human-powered vehicle, a torque of the human driving force, a transmission ratio of the human-powered vehicle, a wheel size of the human-powered vehicle, an air resistance coefficient, a value related to a front surface projection area of a rider of the human-powered vehicle, a wind velocity, a rolling resistance coefficient, a value related to a weight of a carried load of the human-powered vehicle, and an acceleration of the human-power vehicle.