Sensor Signal Offset Compensation Using Shift Register Averaging
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Solution Overview
Problem
Existing technologies face challenges in detecting and compensating for signal errors in the transmission chain between sensors and analog signal interfaces without interrupting the signal transmission, which is critical for safety-critical systems like electronic brake systems.
Innovation Solution
A non-invasive measurement method using a slider with elements of the number N, a mean, and a low-pass filter to detect and compensate for signal errors by forming differences, determining mean values, and correcting sensor values based on calculated offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive measurement methods are used to test the RDS transmission channel, then measurement accuracy is improved, but signal transmission must be interrupted which reduces system availability
Solution Approach 1:
The patent introduces an intermediary measurement approach that uses the existing signal transmission path itself as the measurement medium. By analyzing the RDS signal characteristics (frequency, amplitude, timing) during normal operation, the system can detect transmission channel errors without interrupting signal flow. This intermediary method bridges the gap between accurate measurement and continuous operation.
Solution Approach 2:
The patent replaces the mechanical/interrupt-based invasive measurement system with a signal-processing-based non-invasive measurement system. Instead of physically interrupting or decoupling the transmission channel to perform measurements, the system uses digital signal processing techniques to extract measurement information from the ongoing signal transmission, substituting a non-intrusive electronic measurement approach.
2Reliability
If non-invasive measurement methods are used to analyze the RDS signal, then system availability is maintained, but measurement precision deteriorates due to signal interference
Solution Approach 1:
The patent segments the RDS signal analysis into multiple independent measurement parameters (frequency analysis, amplitude analysis, timing analysis). By dividing the measurement task into separate dimensional analyses, the system can extract accurate measurement information from each parameter while the signal continues to transmit. This segmentation allows precise measurement without requiring signal interruption.
Solution Approach 2:
The patent performs multiple partial measurements of different signal characteristics simultaneously rather than attempting a single comprehensive measurement. By measuring frequency, amplitude, and timing parameters separately and independently during normal operation, the system achieves sufficient measurement precision for error detection without interrupting the signal transmission.
3Reliability
If continuous signal transmission is maintained for safety-critical systems, then system availability is improved, but error detection capability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the continuously transmitted RDS signal is simultaneously monitored and analyzed. The measurement results feed back into the evaluation logic to detect transmission errors. This feedback loop enables continuous error detection during normal operation without requiring signal interruption, maintaining both system availability and error detection capability.
Data Source
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AI summary
The invention relates to a method for offset compensation for sensor signals by means of an offset compensation device (15), wherein the offset compensation device comprises a shift register (17) having a number (N) of elements, an averaging unit (19) and a low-pass filter (21) and wherein the method involves the following steps being carried out: – storing sensor values in the shift register (17), – calculating the difference between the first element of the shift register (17) and the last element of the shift register (17), – determining multiple mean values, wherein the following steps are carried out: a) starting the averaging by the averaging unit (19) if the difference is greater than a threshold value (S), b) stopping the averaging by the averaging unit (19) if the difference is less than the threshold value (S), – determining the lowest signal level by means of the low-pass filter (21) on the basis of the mean values, – determining the offset by calculating the difference between the lowest signal level and a reference current value, – correcting the sensor values by means of the determined offset. The invention further relates to an offset compensation device and a sensor device.