Human-Powered Vehicle Derailleur Control With Adaptive Motor Force
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Solution Overview
Problem
Existing human-powered vehicle control devices struggle to appropriately perform shifting actions of the derailleur, particularly when the vehicle is stopped or under certain conditions that may restrict the shifting action.
Innovation Solution
A human-powered vehicle control device with an electronic controller that manages a motor to drive the transmission body and derailleur, allowing for shifting actions even when the crank axle is stopped, and adjusts motor driving force based on various conditions such as rider posture, wheel contact, and other parameters to ensure appropriate shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor drives the transmission body with high driving force to perform shifting action when the crank axle is stopped, then the shifting action can be performed, but the derailleur shifting action may be restricted
Solution Approach 1:
The control device dynamically adjusts motor driving force based on vehicle state and derailleur position. When the vehicle is stopped and the derailleur is in a restricted position, the motor driving force is reduced to prevent restriction of the shifting action. This dynamic adjustment resolves the contradiction by adapting the power output to the specific operational conditions.
Solution Approach 2:
The system changes the parameter of motor driving force based on detected conditions (vehicle stopped, derailleur position, rider posture). By modifying the driving force parameter according to these conditions, the system ensures reliable shifting action while preventing derailleur restriction.
2Reliability
If the motor driving force is reduced to prevent derailleur restriction, then the shifting action reliability improves, but the shifting action may not be performed effectively
Solution Approach 1:
The control device dynamically adjusts motor driving force based on vehicle state and derailleur position. When the vehicle is stopped and the derailleur is in a restricted position, the motor driving force is reduced to prevent restriction of the shifting action. This dynamic adjustment resolves the contradiction by adapting the power output to the specific operational conditions.
Solution Approach 2:
The system changes the parameter of motor driving force based on detected conditions (vehicle stopped, derailleur position, rider posture). By modifying the driving force parameter according to these conditions, the system ensures reliable shifting action while preventing derailleur restriction.
3Ease of operation
If the control device always maintains high motor driving force for shifting, then the shifting action can be performed, but the rider may feel discomfort when the vehicle is stopped
Solution Approach 1:
The control device dynamically adjusts motor driving force based on vehicle state and derailleur position. When the vehicle is stopped and the derailleur is in a restricted position, the motor driving force is reduced to prevent restriction of the shifting action. This dynamic adjustment resolves the contradiction by adapting the power output to the specific operational conditions.
Solution Approach 2:
The system changes the parameter of motor driving force based on detected conditions (vehicle stopped, derailleur position, rider posture). By modifying the driving force parameter according to these conditions, the system ensures reliable shifting action while preventing derailleur restriction.
Data Source
AI summary
A human-powered vehicle control device includes an electronic controller configured to control a motor to drive a transmission body with the motor and operate the transmission body with a derailleur to perform a shifting action that changes the transmission ratio in a case where a crank axle is stopped. The electronic controller includes in a control state including a first control state in which the shifting action is performed and a second control state in which a driving force of the motor during the shifting action is reduced compared to the first control state. The electronic controller shifts the control state to the second control state in a case where a rider is riding the human-powered vehicle and at least one of a posture of a body of the human-powered vehicle and a posture of the rider is in a predetermined state.