Adaptive Motion Sensor Thresholding to Prevent False Alarms

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Solution Overview

Problem

Current motion sensors, such as microwave and infrared sensors, generate false alarms due to self-excitation or external interference, leading to unnecessary activation and deactivation of target devices.

Innovation Solution

A motion sensor with a self-adaptive adjustment function that includes a sensing module, processing module, and communication module, which calculates the duration of sensing signals to generate control signals only when the duration exceeds a threshold, and adjusts the threshold value based on a self-adaptive coefficient to prevent false alarms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If motion sensors use self-excitation or external interference detection methods, then they can detect moving objects to activate target devices, but they generate false alarms leading to erroneous operation

Engineering Contradiction:

Improvedetection accuracyVSAvoidfalse alarms

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamics by making the threshold value adaptive rather than fixed. The processing module dynamically adjusts the threshold based on the duration of sensing signals, allowing the system to adapt to different environmental conditions and distinguish between genuine motion and false alarm sources effectively

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of threshold value from a static preset value to a dynamic value that varies based on signal duration characteristics. By monitoring whether the sensing signal duration exceeds the threshold, the system can differentiate between legitimate motion events and false alarms caused by self-excitation or external interference

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If motion sensors activate target devices upon detecting sensing signals, then they can control lighting and other devices, but target devices are erroneously turned on and off due to false alarms

Engineering Contradiction:

Improveautomatic controlVSAvoidoperational stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent implements feedback by continuously monitoring the duration of sensing signals and using this information to adjust the threshold value for subsequent detections. This feedback mechanism allows the system to learn from past detections and improve its ability to distinguish valid motion events from false alarms, stabilizing the operational state of controlled devices

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts the detection threshold based on the characteristics of received sensing signals. When false alarms are detected (signals with duration below threshold), the system adapts by raising the threshold, thereby stabilizing device operation and preventing erroneous on/off cycling

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260052613A1Motion sensor with self-adaptive adjustment function and self-adaptive adjustment method thereof

Publication Date: 2026.02.19 XIAMEN PVTECH CO LTD

AI summary

A motion sensor with self-adaptive adjustment function includes a sensing module, a processing module and a communication module. The sensing module generates a sensing signal. The processing module is connected to the sensing module, and calculates the duration of the sensing signal. The communication module is connected to the processing module. When the processing module is in a preset state and the duration of the sensing signal is greater than or equal to a target threshold value, the processing module generates a control signal and transmits the control signal to a target device via the communication module.