PIR Sensor Pairing and Network Layout for Reliable Detection
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Solution Overview
Problem
PIR sensors in wireless networks fail to detect living bodies in a timely manner when they become abnormal, leading to inaccurate sensing and continuous lighting issues.
Innovation Solution
A method involving a three-dimensional layout of PIR sensors and sensor lamps, connected in a wireless network with sub-networks, where sensors operate in pairs using a time-sharing method to ensure detection coverage and determine sensor lamp states based on feedback data, with ambient light sensors for additional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PIR sensors are arranged in a wireless network, then the complexity of wiring and installation is reduced, but the reliability of detection deteriorates when sensors become abnormal
Solution Approach 1:
The system divides the wireless network into multiple sub-networks, with each sub-network containing multiple PIR sensors that can independently function. This segmentation ensures that if one sensor fails, other sensors in the same sub-network or adjacent sub-networks can continue to provide detection coverage, thereby maintaining detection reliability while preserving the wireless installation advantage
Solution Approach 2:
The patent implements a mechanism where adjacent sub-networks and multiple sensors within sub-networks provide redundant detection coverage before any sensor failure occurs. This beforehand cushioning ensures that detection coverage is maintained even when sensors become abnormal, solving the reliability issue while keeping the wireless network structure
2Area of stationary object
If multiple PIR sensors are deployed to ensure coverage, then the detection coverage is improved, but the complexity of network configuration and parameter setting increases
Solution Approach 1:
Multiple PIR sensors are grouped into sub-networks that function as integrated detection units. Each sub-network is configured as a standardized group with four sensors, and adjacent sub-networks are coordinated to provide seamless coverage. This merging approach maintains comprehensive detection coverage while reducing configuration complexity through standardized grouping
Solution Approach 2:
The system implements dynamic time-sharing detection where sensors within sub-networks alternate their detection activities. This dynamic operation allows sensors to share the detection load, maintaining comprehensive coverage while reducing the complexity of simultaneous configuration and management of all sensors
3Measurement precision
If point-to-point controller is used for parameter updates, then the control precision is maintained, but the productivity of system deployment deteriorates due to large workload
Solution Approach 1:
The patent implements a universal wireless communication protocol that enables centralized parameter updates to be transmitted to multiple sensors across different sub-networks simultaneously. This universal communication approach maintains precise parameter control while dramatically improving deployment productivity by eliminating the need for individual point-to-point configuration
Data Source
AI summary
A method for controlling passive infrared sensors includes obtaining a three-dimensional image of a space to be laid out; arranging a plurality of PIR sensors and a plurality of sensor lamps on the three-dimensional image, a distance L between each adjacent two PIR sensors is equal to or less than a sensing radius of the PIR sensor; connecting each PIR sensor to a wireless network including a plurality of wireless sub-networks, each wireless sub-network includes four PIR sensors and at least one sensor lamp; controlling the four PIR sensors to sense living bodies in pairs every detection period, and when sensing data of living body is fed back, determining that there is at least one living body in the wireless sub-network; and determining a working state of the sensor lamp according to whether there is at least one living body in the wireless sub-network.