Occupancy Detector Switch Dynamic Signal Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current passive infrared (PIR) sensor switches can only activate or deactivate loads based on a threshold value of infrared energy, without considering the strength or frequency of the signal, leading to inconsistent and unresponsive control of devices.
Innovation Solution
A sensor switch system that includes an infrared sensor, a control unit to analyze the strength and frequency of the signal, and a controller to enable the load for a variable period based on these parameters, allowing for nuanced control of devices such as lights or alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a PIR switch uses a fixed threshold value for sensor signal activation, then the control logic is simple, but the control precision and responsiveness are insufficient
Solution Approach 1:
The patent applies dynamics by transitioning from a static fixed threshold to a dynamic threshold that varies based on signal strength and duration. The control unit adjusts the activation threshold dynamically according to the detected signal characteristics, allowing the system to adapt to different motion scenarios while maintaining appropriate control precision without excessive complexity.
Solution Approach 2:
The patent implements parameter changes by modifying the threshold parameter based on signal strength and duration. Instead of using a constant threshold, the system changes the threshold parameter dynamically according to the detected motion characteristics, enabling precise control while managing complexity through parameter adaptation rather than complex logic.
2Device complexity
If a PIR switch activates the load for a fixed predetermined time, then the control mechanism is simple, but the adaptability to different motion durations is poor
Solution Approach 1:
The patent applies dynamics by making the load activation time dynamic rather than fixed. The control unit adjusts the duration for which the load remains activated based on the detected signal duration, allowing the system to adapt to different motion scenarios. This dynamic adjustment maintains versatility while avoiding the need for complex predetermined time tables.
Solution Approach 2:
The system implements self-service by having the detected signal characteristics automatically determine the activation duration without external intervention. The control unit uses the signal duration information to self-adjust the load activation time, enabling adaptability to different motion durations while keeping the control mechanism relatively simple through automatic parameter derivation.
3Reliability
If a PIR switch treats all motion detections equally, then the response is consistent, but the user friendliness and quality of control are reduced
Solution Approach 1:
The patent applies local quality by treating different motion detections differently based on their specific characteristics. Instead of uniform treatment, the control unit analyzes signal strength and duration to identify different motion types (e.g., human presence vs. animal movement) and applies appropriate control responses. This differentiated approach enhances user friendliness while maintaining reliability through characteristic-based differentiation.
Solution Approach 2:
The patent implements parameter changes by modifying the control response parameters based on signal characteristics. The control unit changes the activation behavior (threshold, duration) according to the detected signal strength and duration, allowing consistent reliability for valid motions while providing user-friendly differentiation for various motion types without requiring complex manual configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables more precise and user-friendly control of loads by differentiating between types of motions based on signal strength and duration, optimizing power usage and user experience.
Implementation Method 1
A PIR sensor measures infrared (IR) light or energy radiating from objects in its field of view
Implementation Method 2
A sensor, or set of sensors, detect a change in IR energy across the sensor
Data Source
AI summary
A sensor switch includes an infrared sensor, and a control unit coupled to the infrared sensor and configured to receive a signal corresponding to an object detected by the infrared sensor, wherein the control unit is configured to enable an ON state of a device under control of the sensor switch for a period of time depending on a duration and a strength of the signal from the infrared sensor.