Bicycle Shift Controller Temporary Chain Guide Positioning
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Solution Overview
Problem
Existing gear shifting devices for human-powered vehicles face challenges in smoothly transitioning between gear positions, particularly in multistage shifts, due to inadequate temporary positioning strategies, leading to interference and inefficiency.
Innovation Solution
A shifting control device that uses a controller to manage an actuator, allowing for temporary positioning adjustments based on multistage-gear-shift information, enabling smoother transitions between gear positions by selecting optimal temporary positions during gear shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multistage gear shift operation is executed to move the chain guide between at least three gear positions, then the gear shifting capability is improved, but the smoothness of the shifting operation deteriorates due to inadequate temporary positioning strategies
Solution Approach 1:
The gear shift operation is segmented into multiple stages with intermediate temporary positions. Instead of moving directly from one gear position to another, the chain guide is temporarily positioned at intermediate points (first temporary position, second temporary position) during the transition, breaking down the complex multistage shift into manageable single-stage operations that are smoother and more reliable
Solution Approach 2:
The controller preliminarily determines and sets the temporary positions before executing the full multistage gear shift. By pre-establishing the first temporary position and second temporary position based on multistage-gear-shift information, the system prepares the chain guide for smooth transitions through predetermined intermediate locations, avoiding abrupt movements
2Reliability
If the chain guide is temporarily positioned during gear shifts, then the smoothness of shifting is improved, but the device complexity increases due to multiple position control requirements
Solution Approach 1:
The controller is designed to handle both single-stage and multistage gear shift operations using the same temporary positioning mechanism. The controller universally manages different gear shift scenarios by selecting appropriate temporary positions from stored multistage-gear-shift information, making the control system adaptable without requiring separate mechanisms for different shift types
Solution Approach 2:
The system uses stored multistage-gear-shift information that contains predetermined temporary position data for various gear shift scenarios. By copying and utilizing this pre-stored information, the controller avoids complex real-time calculations and simply retrieves the appropriate temporary positions, reducing control complexity while maintaining smooth shifting
3Reliability
If different temporary positions are used for multistage and single gear shift operations, then the shifting smoothness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The system changes the position parameters dynamically based on the type of gear shift operation. The controller selects different temporary position parameters (first temporary position for multistage, second temporary position for single stage) from stored multistage-gear-shift information, allowing the system to adapt position parameters without requiring extremely tight manufacturing tolerances for all possible positions
4Object-generated harmful factors
If the first temporary position and second temporary position are offset from each other, then the interference between chain and sprocket is reduced, but the device complexity increases
Solution Approach 1:
The system applies different temporary position offsets locally depending on the specific gear shift scenario. The first temporary position is offset appropriately for multistage shifts, while the second temporary position is offset differently for single-stage shifts. This localized adaptation reduces chain-sprocket interference in each specific context without requiring a complex overall mechanism
Data Source
AI summary
A shifting control device comprises a controller configured to control an actuator of a gear shifting device to arrange a chain guide of the gear shifting device on a plurality of gear positions. The controller is configured to control the actuator to temporarily arrange the chain guide on a first temporary position in a multistage gear shift operation before stopping the chain guide at the first target gear position. The controller is configured to temporarily arrange the chain guide on a second temporary position in a single gear shift operation before stopping the chain guide at the second target gear position. The first temporary position is offset from the second temporary position in the gear shift direction if the first target gear position is the first target gear position and the second target gear position correspond to the same gear position of the plurality of gear positions.