Safety Actuation Sensor Frequency Signal Encoding
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Solution Overview
Problem
Existing safety actuation sensors lack versatility in distinguishing between different actuation elements and efficiently transmitting this information to a safety controller, which limits their ability to trigger appropriate reactions in response to varying conditions.
Innovation Solution
A safety actuation sensor with a sensor element and evaluation unit that outputs distinct frequency signals on two safety outputs based on detected actuation elements, allowing the safety controller to recognize and react to different actuators, and includes a redundant system for error detection and fail-safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the safety actuation sensor uses only two safety outputs to detect multiple actuation elements, then the device complexity is reduced, but the ability to distinguish between different actuation elements is limited
Solution Approach 1:
The patent applies parameter changes by modulating the frequency of the actuation signal to encode different actuation elements. Instead of using multiple output channels, the system varies the frequency parameter of a single signal to represent different actuators, thereby reducing hardware complexity while maintaining discrimination capability
Solution Approach 2:
The evaluation unit is designed to perform multiple functions: it detects actuation elements, distinguishes between different elements through frequency analysis, and generates appropriate actuation signals. This multi-functionality allows the system to handle multiple actuation elements with a unified two-output interface, eliminating the need for separate detection circuits for each element
2Loss of information
If the evaluation unit outputs additional frequency signals to transmit actuator element information, then the loss of information is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the identification information and actuation signal into a single frequency-modulated output signal. The actuator element's identity is encoded in the frequency characteristic of the actuation signal itself, combining data transmission and control functions into one signal path, thereby reducing information loss without proportionally increasing device complexity
Solution Approach 2:
The evaluation unit acts as an intermediary that translates physical actuation events into frequency-coded electrical signals. It detects the actuation element and converts its identity into a frequency parameter that can be transmitted through the existing two-output interface, serving as a mediator between the physical actuator and the control system
3Adaptability or versatility
If the safety controller triggers different reactions based on detected actuation elements, then the adaptability of the system is improved, but the device complexity increases
Solution Approach 1:
The control system implements dynamic response by adjusting its reaction based on the detected actuation element's frequency signature. Different frequencies trigger different control actions, allowing the system to adapt its behavior dynamically according to which actuator is activated, thereby improving versatility without requiring separate hardwired control paths for each actuator type
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 the safety controller to differentiate between various actuation elements, trigger appropriate responses, and ensure fail-safe operation by using frequency signals and RFID technology, enhancing the sensor's versatility and reliability in detecting dangerous movements and maintaining system safety.
Implementation Method 1
the safety actuation sensor is an RFID system, wherein the sensor element is an antenna array for communication with the actuating element
Data Source
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AI summary
Safety actuation sensor with a sensor element (18), with an evaluation unit (2) and with at least one actuator element (4), wherein the safety actuation sensor (1) has two safety outputs (6) which are connected to a safety controller (8), wherein the evaluation unit (2) is configured to output an actuation signal (10) on each of the two safety outputs (6) depending on the detection of the actuator element (4) by the sensor element, wherein the evaluation unit is configured to detect different actuator elements, the evaluation unit is configured to distinguish the different actuator elements, and the evaluation unit (2) is configured to output frequency signals (12) with frequencies (A, B, C) on each of the two safety outputs (6) depending on the detected actuator element (4).