Sensor Signal Plausibility Check Over a Single Serial Link
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Solution Overview
Problem
Existing methods for ensuring error-free transmission of time-discrete measured values, particularly in safety-relevant devices like gas blowers, are costly due to the requirement for redundant systems.
Innovation Solution
A method where a time-discrete signal from a sensor is converted into two measured values by different evaluating devices, transmitted to a control system, and compared to check for identity, allowing for a plausibility check and safeguarding of data using a single serial data connection, reducing costs and maintaining safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant systems are used to ensure error-free transmission of measured values, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the measured value transmission into two separate evaluation paths within the electronic system. Two different evaluation devices independently process the same sensor signal, creating two measured values that are then transmitted separately to the control system for comparison. This segmentation allows error detection without requiring fully redundant hardware systems.
Solution Approach 2:
The control system implements a feedback mechanism by comparing the two independently evaluated measured values. The comparator receives both values and generates a plausibility check result that feeds back to the control system. This feedback loop enables automatic error detection when the two values diverge, maintaining reliability without complex redundant systems.
2Reliability
If separate electrical paths are used for control value and rotation signal transmission, then reliability is improved, but the number of signal lines and system complexity increase
Solution Approach 1:
The patent merges multiple signal transmissions into a single serial data connection link. Both the control value and the rotation signal (along with the two measured values for plausibility checking) are transmitted through this single communication interface between the electronic system and the control system, reducing the number of electrical paths while maintaining reliable transmission.
3Measurement precision
If multiple measured values are transmitted and compared, then measurement precision and error detection are improved, but data transmission time and processing time increase
Solution Approach 1:
The patent implements periodic comparison of the two measured values at predetermined time intervals. The control system compares the values in periodic cycles rather than continuously, which reduces processing time while maintaining measurement precision. This periodic action allows the system to balance error detection capability with acceptable response time.
Data Source
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 of the sensor is converted into a first measured value and a second measured value by two different evaluating devices of an electronic system, wherein the first and second measured values are transmitted to a control system by the electronic system, and the control system calculates a first control signal from the first measured value and, in parallel thereto, a second control signal from the second measured value, wherein the control system comprises a comparator which compares the first control signal and second control signal to verify the identity thereof.