Signal Processing Unit Cross-Circuit Detection
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Solution Overview
Problem
In secure applications, sensors routed through a common cable are prone to cross-circuits, which can lead to safety-critical malfunctions, and existing methods struggle to effectively detect these cross-circuits without spatial separation.
Innovation Solution
Independent sensors are modified to have different signal levels over time, allowing them to be transmitted on the same signal conductors in a common cable, with a processing unit checking for cross-circuits by ensuring different signal levels, and a control and evaluation unit generates signal changes in one sensor signal based on edges in another, maintaining the change for a predetermined period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensors are routed through a common cable to simplify wiring, then device complexity is reduced, but reliability deteriorates due to risk of cross-circuits
Solution Approach 1:
The system performs preliminary cross-circuit detection by comparing sensor signals before they can cause safety-critical malfunctions. The control unit continuously monitors sensor signals and detects cross-circuits in advance, allowing the system to take preventive action before failures occur.
Solution Approach 2:
The system implements continuous feedback monitoring of sensor signals routed through the common cable. The control unit receives sensor signals, compares them to detect cross-circuits, and can trigger safety responses based on the detection results, creating a closed-loop safety mechanism.
2Reliability
If sensor signals are modified to have different signal levels to enable cross-circuit detection, then reliability is improved, but device complexity increases due to signal processing requirements
Solution Approach 1:
The system applies signal modification only when necessary for cross-circuit detection. The control unit selectively modifies sensor signals based on detection requirements, applying changes to specific signals rather than all signals continuously, thereby reducing unnecessary processing complexity.
Solution Approach 2:
The system changes signal parameters (signal levels) to enable cross-circuit detection. By modifying the amplitude or voltage levels of sensor signals, the system creates detectable differences that allow the control unit to identify cross-circuits without requiring complete signal separation.
Data Source
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AI summary
Signal processing unit and method for generating an output signal at an output terminal (8) with a cable (6) having at least two signal conductors (7), wherein a first sensor signal (M1) of a first sensor (4) is present at a first input terminal (3) and a second sensor signal (M2) of a second sensor (5) is present at a second input terminal (3), wherein the input terminals (3) are each connected by a cable (6), wherein a control and evaluation unit (10) is arranged, wherein the control and evaluation unit (10) generates a signal change at a first sensor signal (M1) of a first sensor (4) at an edge or signal change of a second sensor signal (M2) of a second sensor (5), wherein the signal change is maintained for a predetermined time period.wherein the control and evaluation unit (10) outputs the first sensor signal (M1*) and the second modified sensor signal (M2*) respectively on the signal conductors (7) of the output terminal (8).