Sooty Particle Sensor Signal Correction for Exhaust Gas Measurement
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Solution Overview
Problem
Current methods for determining sooty particle concentration in exhaust gas systems of internal combustion engines are inaccurate due to sensitivity to external variables like sensor temperature, exhaust gas temperature, and flow velocity, which affect particle accumulation and impedance measurement.
Innovation Solution
The sensor signal is corrected for sensor temperature, exhaust gas temperature, flow velocity, and voltage applied, accounting for temperature-dependent resistance and accumulation probabilities to improve the accuracy of sooty particle loading determination in the emission control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a collecting particle sensor is used to measure sooty particle concentration, then particle concentration can be determined, but the measurement is inaccurate due to sensitivity to external variables such as sensor temperature, exhaust gas temperature, and flow velocity
Solution Approach 1:
The patent applies parameter changes by introducing correction factors that account for variations in sensor temperature, exhaust gas temperature, and flow velocity. These parameters are measured and used to adjust the raw sensor signal, compensating for their influence on particle accumulation and impedance measurement. This resolves the contradiction by maintaining measurement precision while accounting for the harmful effects of external variables through systematic parameter adjustment.
2Device complexity
If the sensor operates without correction for external variables, then the system is simpler, but the determination of particle concentration and emission control system depletion is inaccurate
Solution Approach 1:
The patent introduces intermediary correction factors that mediate between the raw sensor signal and the final particle concentration determination. These correction factors account for the influence of external variables without requiring a complete redesign of the sensor system. The correction factors act as intermediaries that translate the affected sensor signal into accurate particle concentration data, resolving the contradiction between device simplicity and measurement precision.
3Measurement precision
If the sensor signal is corrected for multiple external variables, then measurement accuracy is improved, but the evaluation process becomes more complex
Solution Approach 1:
The patent applies universality by creating a multi-functional evaluation system that simultaneously corrects for multiple external variables (sensor temperature, exhaust gas temperature, flow velocity) using a unified correction approach. The correction factors serve multiple purposes: they compensate for individual variable influences and their interactions, and they enable accurate particle concentration determination across varying operating conditions. This resolves the contradiction by achieving comprehensive correction through a integrated evaluation process.
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 correction method enhances the reliability and accuracy of determining particle concentrations, leading to improved forecasting of emission control system depletion and more precise closed-loop control of combustion characteristics.
Implementation Method 1
the particle sensor is heated up with the aid of an integrated heating element and is cleared of the accumulated sooty particles by oxidation
Implementation Method 2
If sooty particles deposit on the electrode structure, the impedance of the mechanism changes
Data Source
AI summary
The invention concerns a procedure to ascertain a concentration of sooty particles in an exhaust gas system of an internal combustion engine or a depletion of an emission control system of the internal combustion engine due to the loading of sooty particles, whereby the sooty particle concentration in the exhaust gas system is determined by means of a collecting particle sensor, which emits a sensor signal and whereby the depletion of the emission control system due to the loading of sooty particles is determined from the sooty particle concentration.The task is thereby solved, in that the sensor signal is corrected by means of predetermined corrections with regard to a sensor temperature and/or an exhaust gas temperature and/or a flow velocity of the exhaust gas and/or a voltage applied at the particle sensor. Transverse sensibilities of the particle sensor can thereby be taken into account during the evaluation; and the determination of the accumulated loading of sooty particles and the determination of the sooty particle concentration in the exhaust gas system are improved. In the process, the sensor temperature enters into the correction to the extent that a temperature dependence of the electrical resistance of the loading of sooty particles is determined in a preparation phase and can be taken into account during the evaluation of the sensor signal.