Dual-Evaluation Sensor Signal Checking on a Single Serial Link
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Solution Overview
Problem
Existing methods for ensuring error-free transmission of time-discrete signal values, particularly in safety-relevant devices like gas blowers, require redundant systems, which are costly and inefficient.
Innovation Solution
A method where a time-discrete signal value from a sensor is converted into two measured values by different evaluation devices, transmitted to a controller, and compared for identity using a comparator, allowing for a plausibility check and safeguarding of data via a single serial data connection, reducing the need for redundant systems and meeting safety requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant devices are used to ensure error-free transmission of measured values, then reliability is improved, but cost increases
Solution Approach 1:
The patent combines multiple measured value transmissions (first and second measured values) into a single data transmission path between the electronics and the controller. This merging approach eliminates the need for physically redundant transmission lines while maintaining the ability to perform plausibility checks through parallel evaluation of multiple measured values derived from the same sensor signal
Solution Approach 2:
The patent creates a logical copy of the measured value transmission path by deriving both first and second measured values from the same sensor signal through different evaluation methods. This allows the system to simulate redundant measurement paths without requiring duplicate physical hardware, achieving fault detection capability at lower cost
2Reliability
If separate electrical paths are used for control value and rotation signal transmission, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple signal transmission functions into a single serial data connection between the electronics and the controller. This single communication interface carries both the first and second measured values, eliminating the need for separate electrical paths while maintaining transmission reliability through redundant data streams
Solution Approach 2:
The single serial data connection serves multiple functions: transmitting the first measured value, transmitting the second measured value, and enabling plausibility verification. This multi-functional approach reduces the number of dedicated signal lines required while maintaining comprehensive monitoring capability
Data Source
Figure 1
AI summary
The invention relates to a method for checking a time-discrete signal value of a sensor for freedom from errors, wherein the signal value from the sensor is transformed by two different evaluating devices of an electronics system into a first measured value and a second measured value, wherein the first and the second measured values are transmitted by the electronics system to a control system and the control system calculates a first control signal from the first measured value and in parallel therewith a second control signal from the second measured value, wherein the control system comprises a comparator which compares the first control signal and the second control signal to verify the identity thereof.