Multi-Zone Sensor Monitoring for Safe Automatic Restart
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Solution Overview
Problem
Existing systems for automatic restart of hazardous areas, such as pallet magazine systems, fail to ensure safety due to non-adherence to predefined sequences by vehicles with long protrusions, leading to unnecessary system downtime.
Innovation Solution
A monitoring device with separate sensors for outdoor and indoor areas, allowing for a tolerant sequence of object detection signals to ensure safe automatic restart, including a radar sensor for outdoor and ultrasonic sensor for indoor areas, with optional integration of induction loops and light curtains, ensuring the system remains safe and operational.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety sensor monitors the access area and predefined sequences are enforced for automatic restart, then system safety is improved, but system downtime increases due to unnecessary restrictions on valid entry/exit scenarios
Solution Approach 1:
The monitoring system is segmented into multiple sensor elements distributed across different locations (outdoor area, access area, indoor area). Each sensor monitors a specific zone and generates independent object detection signals. This segmentation allows the system to track objects through different spatial zones, enabling more nuanced sequence validation that accommodates various entry/exit scenarios while maintaining safety.
Solution Approach 2:
The system dynamically evaluates sequences of object detection signals from multiple sensors to determine valid entry and exit scenarios. Instead of enforcing rigid predefined sequences, the system adapts its validation logic to recognize different valid scenarios (e.g., object detected in outdoor area then access area, or directly in access area then indoor area). This dynamic approach reduces unnecessary downtime while maintaining safety by allowing flexible interpretation of sensor signal patterns.
2Measurement precision
If multiple sensor elements are deployed to monitor different areas, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The monitoring function is segmented across multiple sensor elements positioned in different locations (outdoor, access area, indoor). Each sensor provides localized detection, and the combination of segmented sensor data achieves comprehensive monitoring with high detection accuracy while keeping individual sensor units simple and standardized.
Solution Approach 2:
Multiple sensor elements perform the same universal function of detecting objects in their respective zones. This multi-functionality approach allows the system to achieve high measurement precision through redundant detection coverage without requiring complex specialized sensors, as each sensor element remains a standard, simple device that can be deployed in multiple locations.
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 safe and fault-tolerant automatic restart of systems by allowing for flexible sequences of object detection signals, accommodating various vehicle geometries, thus reducing downtime and ensuring safety.
Implementation Method 1
A monitoring device with separate sensors for outdoor and indoor areas, allowing for a tolerant sequence of object detection signals to ensure safe automatic restart, including a radar sensor for outdoor
Implementation Method 2
including a radar sensor for outdoor and ultrasonic sensor for indoor areas
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
The invention relates to a monitoring device (1) with a safety sensor by means of which an access area (6) to a danger zone (2) of a system controlled by a control unit is monitored. The output signals of the safety sensor are supplied to the control unit. Upon detection of an object, the safety sensor activates an object detection signal in the access area (6), by means of which the control unit shuts down the system. Sensor elements are provided whose output signals are supplied to the control unit. These sensor elements monitor an interior area within the danger zone (2) and an exterior area outside the danger zone (2). Upon detection of an object within the interior area and upon detection of an object outside the exterior area, the sensor elements activate an object detection signal.After the system is shut down, the control unit automatically restarts the system if, in a first sequence, the outdoor sensor devices and the safety sensor each activate an object detection signal, regardless of the order, and then the indoor sensor devices activate an object detection signal, and if, in a second sequence following the first sequence, the indoor sensor devices deactivate the object detection signal, and then the outdoor sensor devices and the safety sensor each deactivate the object detection signal, regardless of the order.