Sensor Element Measurement Correction via Switching Position
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Solution Overview
Problem
Sensor elements connected in a cyclically alternating manner experience measurement falsification due to previous circuit states, particularly from polarization effects, leading to systematic errors that are not effectively corrected by existing methods like low-pass filters, which also reduce signal dynamics.
Innovation Solution
A method that corrects individual measured values based on the switching position by determining and storing correction values during a learning phase, allowing for precise adjustment of measurements in subsequent phases, using an approximate value and averaging techniques to minimize dynamic loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a low-pass filter is used to correct measured values, then measurement accuracy is improved, but signal dynamics are reduced
Solution Approach 1:
The patent divides the correction approach into segments: instead of applying a single low-pass filter to all measured values, it segments the correction by switching position, creating position-specific correction values that are applied selectively to maintain dynamics while improving accuracy
Solution Approach 2:
The patent changes the parameter of correction from a uniform filtering approach to position-dependent correction values, where each switching position has its own correction factor, thereby maintaining signal dynamics while improving measurement accuracy
2Measurement precision
If circuit states are selected periodically for measurements, then systematic correction becomes possible, but measurement falsification occurs due to polarization effects from previous states
Solution Approach 1:
The patent applies preliminary action by determining correction values in advance for each switching position based on the known polarization effects, so that when measurements are taken, the correction is already prepared and applied, compensating for the polarization effect from previous circuit states
Solution Approach 2:
The patent uses feedback by using the approximate measured value and switching position information to determine correction values, which are then applied to obtain the final corrected measured value, creating a feedback loop that compensates for polarization effects
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
This method effectively corrects sensor measurements by accounting for the influence of preceding circuit configurations, improving accuracy and maintaining signal dynamics, as demonstrated by improved pump current correction in wide-range lambda probes, especially considering rotational speed and pressure dependencies.
Implementation Method 1
a circuit state may produce unwanted polarization of a Nernst cell of the wide-range lambda probe, which, in a subsequent circuit state, may lead to falsification of the measured value of the Nernst voltage at the Nernst cell
Data Source
AI summary
A measured value of a sensor element is obtained during repeatedly executed measuring periods for performing different measurements and for setting different operating states, the sensor element being electrically connected in a periodically alternating manner, in consecutive switching positions, in a predefined order, where at least one measurement for determining the measured value is performed repeatedly within a measuring period for determining individual values at predefined switching positions, the measured value being determined from the individual values. Using the switching position within the measuring period, the operating state of the sensor element preceding the individual measurement, and therefore, the influence of the preceding circuit configuration on the individual measured value, is known, and the individual values are correspondingly corrected. By correcting the individual values, the measured value determined from the individual values is also corrected.