Human-Powered Vehicle Transmission Control for Cargo Loads
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Solution Overview
Problem
Existing human-powered vehicles lack a control system that can adaptively adjust the transmission device based on the attachment of cargo, cargo weight, and user weight, leading to suboptimal performance and increased rider effort.
Innovation Solution
An electronic controller that adjusts the transmission device's range and control state based on the attachment state of a cargo bed, the weight of cargo or user, using sensors to detect these conditions and automatically or user-instructed control adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transmission device is controlled manually without automatic adjustment, then the rider can directly control the transmission ratio, but the rider's pedaling effort increases when cargo is attached or weight increases
Solution Approach 1:
The transmission device automatically adjusts its own ratio based on detected load conditions (cargo attachment, cargo weight, user weight) without requiring manual intervention from the rider. The electronic controller monitors sensor data and autonomously selects appropriate transmission ratios, allowing the system to serve itself rather than requiring continuous rider input.
Solution Approach 2:
The system uses sensors to detect load conditions and provides feedback to the electronic controller, which then adjusts the transmission ratio accordingly. This closed-loop feedback mechanism enables the transmission device to adapt to changing load conditions in real-time, optimizing pedaling efficiency based on actual operational requirements.
2Adaptability or versatility
If a fixed transmission range is used, then the device structure is simple, but the transmission cannot adapt to different load conditions
Solution Approach 1:
The transmission ratio transitions from a static, fixed value to a dynamic, adjustable parameter. The electronic controller continuously monitors load conditions and automatically modifies the transmission ratio in real-time, enabling the system to adapt to varying operational requirements without requiring complex manual intervention mechanisms.
Solution Approach 2:
The transmission device is designed to perform multiple functions by automatically adapting to different load conditions. A single transmission system serves both light and heavy load scenarios through electronic control, eliminating the need for multiple fixed transmission ranges or complex mechanical switching mechanisms.
3Measurement precision
If the transmission device is controlled based on multiple parameters (cargo attachment, cargo weight, user weight), then the control accuracy is improved, but the measurement and detection complexity increases
Solution Approach 1:
The load detection system is divided into separate, independent sensor modules: one for detecting cargo attachment status, another for measuring cargo weight, and a third for measuring user weight. This segmentation allows each sensor to specialize in a specific measurement task, simplifying the overall detection system while maintaining high precision across all parameters.
Data Source
AI summary
A control device is configured to control a transmission device in accordance with a situation in which a human-powered vehicle is used. The control device includes an electronic controller. The electronic controller is configured to control the transmission device provided to the human-powered vehicle. The electronic controller is configured to change a transmission range of the transmission device in accordance with at least one of an attachment state of a cargo bed to the human-powered vehicle, a weight of a cargo loaded on the human-powered vehicle, or a weight of a user riding on the human-powered vehicle.