Presence Sensing Light System with Dual Sensitivity Control
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Solution Overview
Problem
Conventional lighting devices with presence sensing functions face challenges in achieving high sensitivity and reliability simultaneously, often leading to energy wastage or premature shutdown.
Innovation Solution
A presence sensing method and device that utilize a sensing module with dual sensitivity settings, switching from a lower sensitivity when the light is off to a higher sensitivity when it is on, and adjust the delay time period based on user actions, to optimize energy usage and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensitivity of the sensing module is increased to improve presence detection accuracy, then the reliability of user presence detection is improved, but the lighting device becomes easily triggered by mistake causing energy wastage
Solution Approach 1:
The patent applies dynamics by making the sensitivity of the sensing module changeable based on the operational state of the light. When the light is off, the sensitivity is set to a first level for reliable presence detection. When the light is on, the sensitivity switches to a second level to prevent false triggering. This dynamic adjustment resolves the contradiction between reliable detection and energy conservation.
Solution Approach 2:
The patent changes the sensitivity parameter of the sensing module according to different working conditions. By adjusting the sensitivity parameter between two levels based on whether the light is on or off, the system achieves both reliable presence detection and reduced false triggering, thereby solving the energy wastage problem while maintaining detection reliability.
2Loss of energy
If the sensitivity of the sensing module is decreased to avoid false triggering, then energy wastage is reduced, but the lighting device turns off automatically affecting normal user use
Solution Approach 1:
The system dynamically adjusts sensitivity based on operational context. When the light is off, higher sensitivity ensures reliable detection of user presence. When the light is on, lower sensitivity prevents false shutdowns during normal use. This dynamic approach maintains reliability across different operational phases while conserving energy.
Solution Approach 2:
The sensitivity parameter is changed between two discrete levels based on the light's operational state. This parameter switching ensures that the system maintains high detection reliability when needed (light off) while avoiding false positives that would cause unnecessary shutdowns (light on), thus balancing energy conservation with reliable operation.
3Device complexity
If a fixed delay time period is used after turning on the light, then the control logic is simple, but it cannot adapt to different user actions affecting user experience
Solution Approach 1:
The system uses feedback from the sensing module to dynamically adjust the delay time period. Based on whether user actions are detected during the current delay period, the system determines the length of the next delay period. This feedback mechanism enhances user experience by adapting to actual usage patterns while maintaining manageable control logic through clear decision rules.
Solution Approach 2:
The lighting system automatically adjusts its own delay time period based on detected user actions without requiring manual intervention. The system serves itself by using its own sensing capabilities to determine appropriate delay durations, improving user experience through adaptive behavior while keeping the control logic relatively simple through automated decision-making.
Data Source
AI summary
A presence sensing method for a light comprises detecting a presence of a user by a sensing module having a first sensitivity while the light is off; turning on the light when identifying the presence of the user and keeping the light on for a delay time period which has a preset length; increasing a sensitivity of the sensing module to a second sensitivity after turning on the light; detecting actions of the user by the sensing module having the second sensitivity while the light is on; determining a length of a next delay time period based on the actions of the user during the previous delay time period immediately prior to the next delay time period; and keeping the light on for the next delay time period.