Bicycle Controller Motor Torque Phase Timing
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Solution Overview
Problem
Existing bicycle controllers do not effectively consider the riding conditions when controlling motor torque and gear changes, leading to suboptimal performance and rider experience.
Innovation Solution
A bicycle controller with an electronic control unit that adjusts motor control states based on the rotation phase of the crank and the inclination of the bicycle, optimizing torque application and gear changes to match the riding conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bicycle controller controls motor torque based only on crank rotation phase without considering riding conditions, then the control logic is simple, but the control accuracy and adaptability to different riding conditions deteriorates
Solution Approach 1:
The patent applies dynamics by making the control parameters adaptive rather than fixed. The controller dynamically adjusts motor torque control based on real-time detection of riding conditions (inclination angle, crank rotation phase, gear ratio). This allows the system to optimize control accuracy for each specific riding scenario while maintaining a unified control framework, resolving the contradiction between simple control logic and high control accuracy.
2Device complexity
If the gear changer is operated without considering the relationship between torque and crank rotation phase, then the gear change timing is fixed and simple, but the gear change smoothness and rider comfort deteriorates
Solution Approach 1:
The patent applies preliminary action by proactively adjusting motor torque before gear change occurs. The controller detects the desired gear ratio in advance and pre-adjusts motor torque based on the relationship between torque and crank rotation phase. This preliminary torque adjustment ensures that when gear change happens, the torque fluctuation is minimized, resulting in smooth gear transitions and improved rider comfort without requiring complex real-time intervention during the actual gear change.
3Device complexity
If the motor torque is not adjusted according to riding conditions, then the control system is simple, but the energy efficiency and rider effort deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting motor torque based on detected riding conditions. The controller modifies torque parameters according to inclination angle, crank rotation phase, and gear ratio. This adaptive parameter adjustment optimizes energy efficiency across different riding scenarios (uphill, downhill, flat terrain) without requiring a completely complex control system architecture, as it builds upon the existing crank phase detection capability.
Data Source
AI summary
A bicycle controller is provided that performs control in accordance with a riding condition of a bicycle. The bicycle controller includes an electronic control unit that controls a motor. The motor assists human power that is inputted to a bicycle. Upon determining a gear changer that changes a gear ratio of the bicycle is operated, the electronic control unit switches a control state of the motor from a first control state to a second control state based on a rotation phase of a crank of the bicycle and changes a timing at which the control state of the motor is switched from the first control state to the second control state based on an inclination of the bicycle in a front-rear direction.