Wireless Receiver Power Management for Human Powered Vehicles
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Solution Overview
Problem
Wireless receiving devices for human-powered vehicles face challenges in efficiently managing power consumption, particularly in scenarios where communication signals are intermittent or absent, leading to unnecessary energy usage.
Innovation Solution
The implementation of a wireless receiving device with a controller that switches between operation modes based on the presence or absence of communication signals, utilizing a second mode that consumes less power when no signals are received for a threshold period, and reverting to a first mode when signals are detected or a release condition is met, thereby optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver continuously operates in the first mode to ensure reliable signal reception, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The receiver dynamically switches between first mode (high power, continuous reception) and second mode (low power, periodic reception) based on communication signal detection status. This dynamic adaptation resolves the contradiction by adjusting power consumption levels according to actual communication needs, maintaining reliability when signals are present while reducing power consumption during idle periods
Solution Approach 2:
The system changes operational parameters (reception mode, sampling frequency) based on the state of communication signal detection. When no communication signal is detected for a threshold period, the receiver transitions from continuous high-power reception to periodic low-power reception, thereby resolving the trade-off between reliability and power consumption through parameter adaptation
2Use of energy by moving object
If the receiver switches to the second mode to reduce power consumption, then power efficiency is improved, but signal detection capability deteriorates
Solution Approach 1:
In the second mode, the receiver performs communication signal detection periodically rather than continuously. This periodic action maintains sufficient signal detection capability while significantly reducing power consumption compared to continuous reception, resolving the contradiction between power efficiency and signal detection capability
Solution Approach 2:
The system uses feedback from communication signal detection results to control mode switching. When a communication signal is detected in the second mode, the receiver switches back to the first mode, ensuring that signal detection capability is maintained at critical moments while achieving power efficiency during idle periods
3Reliability
If the receiver operates in the first mode during no-communication periods, then signal reception readiness is maintained, but unnecessary energy usage increases
Solution Approach 1:
The receiver performs a threshold-period detection in the first mode before switching to the second mode, ensuring that if a communication signal is about to arrive, the system has already detected it and remains in the ready state. This preliminary action prevents unnecessary switching to low-power mode while avoiding continuous high-power operation, thus resolving the contradiction between readiness and energy waste
Data Source
AI summary
A wireless receiving device for a human powered vehicle comprises a receiver having a first mode, and a second mode in which the receiver consumes less electric power than in the first mode. A controller is configured to set the receiver with the second mode if the receiver does not receive the communication signal in a first-mode period during which the receiver operates in the first mode. The controller is configured to count a consecutive number of a plurality of no-communication periods if no-communication periods consecutively occur. The controller is configured to set the receiver with the first mode if the consecutive number of the no-communication periods is less than a count threshold. The controller is configured to control the receiver to continue the second mode until a release condition is satisfied if the consecutive number is more than or equal to the count threshold.