Bicycle Controller Power Management via Dynamic Transmission Rates
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Solution Overview
Problem
Bicycle electronic control devices consume high power due to continuous message transmission, leading to frequent battery replacement and increased maintenance costs, and they face challenges in cold weather performance.
Innovation Solution
Implementing a control device with a first controller that transmits messages at different rates based on activation and deactivation states, reducing power consumption by transitioning to lower transmission rates after an initial predetermined period and intermittently turning off the transmitter, and using ambient radio frequency power measurements to adjust transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous message transmission is used to ensure reliable communication between controllers, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The transmitter operates in periodic intervals rather than continuously. After an initial continuous transmission period following actuator activation, the transmitter switches to periodic transmission mode, sending messages at predetermined intervals. This reduces power consumption while maintaining communication reliability through periodic updates.
Solution Approach 2:
The transmission rate dynamically adjusts based on system state. The system transitions from continuous transmission during actuator activation to periodic transmission during idle states. This dynamic adjustment optimizes the balance between communication reliability and power consumption according to actual operational needs.
2Speed
If high transmission rate is used during actuator activation to ensure timely data transfer, then communication speed is improved, but power consumption increases
Solution Approach 1:
The system uses high transmission rates periodically during actuator activation events rather than maintaining high rates continuously. This ensures timely data transfer when needed while reducing overall power consumption by returning to lower transmission rates during idle periods.
Solution Approach 2:
The transmission rate parameter changes based on system state. During actuator activation, the transmission rate increases to ensure timely data transfer. After activation ends, the transmission rate decreases to periodic intervals, optimizing the balance between speed and power consumption.
3Reliability
If the transmitter remains continuously on to maintain communication readiness, then communication availability is improved, but battery life decreases
Solution Approach 1:
The transmitter operates periodically rather than continuously after the initial activation period. This maintains communication availability by periodically checking in with the receiver while significantly extending battery life by reducing overall transmitter operation time.
Solution Approach 2:
The system maintains communication availability through periodic transmissions that ensure the receiver remains aware of the transmitter's presence and status. This continuous useful action is achieved through intermittent rather than continuous transmission, preserving battery life while maintaining communication readiness.
Data Source
AI summary
A control device of a bicycle includes an actuator and a first controller. The first controller is configured to generate and transmit, from the first controller to a second controller of the bicycle, messages for a predetermined time period at a first transmission rate in response to activation of the actuator. The first controller is further configured to, after the predetermined period of time, generate and transmit, from the first controller to the second controller, one or more messages at a second transmission rate until the actuator is deactivated. The first transmission rate is greater than the second transmission rate, and each of the messages includes data identifying the activation of the actuator.