Fire Detector Ultrasonic HMI Self-Test
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Solution Overview
Problem
Conventional fire detectors often fail to ensure proper functioning due to improper placement and lack of regular testing, especially in private households where assurance of compliance with installation standards like DIN VDE 0833-2 or DIN 14676 cannot be guaranteed, leading to potential impairment of detection accuracy.
Innovation Solution
A fire detector equipped with a dual-function environment sensor device that not only detects interfering contours but also allows user input via a man-machine interface, using ultrasonic sensors to emit and receive signals to determine the presence and distance of bodies, enabling contactless control and resetting of the alarm state based on predefined conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fire detectors are positioned on the ceiling to detect smoke and heat, then detection coverage is improved, but the risk of improper placement and lack of regular testing increases
Solution Approach 1:
The fire detector automatically performs self-testing by emitting ultrasonic signals to detect objects within the required radius and verifies its own operational status without requiring manual intervention. The device autonomously checks whether the installation environment complies with standards and can reset false alarms automatically, eliminating the need for user-performed installation verification.
Solution Approach 2:
The system continuously monitors its own operational status and installation environment through ultrasonic sensing, providing feedback about object detection within the critical radius. This feedback mechanism allows the detector to identify improper placement or obstruction and trigger appropriate responses such as alarm state activation or self-diagnosis modes.
2Reliability
If the fire detector operates automatically without user intervention, then detection reliability is improved, but the ability to reset false alarms or control the device deteriorates
Solution Approach 1:
The ultrasonic sensor serves dual functions: it detects objects within the critical radius for installation verification and simultaneously enables user interaction for resetting false alarms and controlling the device. This multi-functionality allows the same sensor system to support both automatic operation and user control without requiring separate mechanisms.
Solution Approach 2:
The control device acts as an intermediary that receives ultrasonic signals and interprets them as either environmental data for self-testing or user input for control purposes. By mediating between the sensor signals and device responses, the control device enables flexible operation modes that combine automatic detection with user-initiated control actions.
3Measurement precision
If the environment sensor device only detects interfering contours, then detection precision is improved, but the device complexity increases when adding user input capability
Solution Approach 1:
The environment sensor device is designed to perform multiple functions using the same ultrasonic sensing mechanism: detecting interfering contours for installation verification and detecting user input for control purposes. This universal approach allows a single sensor system to serve both measurement and control functions without requiring separate sensor devices.
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
Ensures reliable detection of fires while allowing users to reset alarms or control the fire detector without physical contact, enhancing operational safety and compliance with installation standards by differentiating between user input and environmental interference.
Implementation Method 1
at least one ultrasonic sensor which is arranged in such a way that it emits ultrasonic signals at least to the side and away from the ceiling or wall and can receive reflected ultrasonic signals
Data Source
Figure 1
Figure 2~3
AI summary
The fire detector (1) has a fire sensor device (3) for detecting fire and outputting a fire signal, which comprises environmental sensor devices (7,8) for detecting objects in the environment of the fire detector and for outputting an environmental signal. A control device (4) sets the normal state and an alarm state of the fire detector on the basis of the fire signal. The fire detector is designed in the form of man-machine interface, and the control device is designed to check whether the environmental signal is deemed to be a user input. An independent claim is included for method for controlling fire detector.