Particle Filter Diagnosis Using Emission Integral Thresholds
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Solution Overview
Problem
Existing methods for diagnosing particle filters in internal combustion engines require significant software input, making them complex and inefficient, especially when using particle untreated emissions models.
Innovation Solution
A method that forms the temporal integral of parameters correlating to particle emissions and compares it with loading thresholds to simplify the diagnosis, allowing for reduced software application and flexible evaluation during various engine operating cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particle untreated emissions models are used for diagnosing particle filters, then the diagnosis can be performed, but the software input requirement becomes large and the system complexity increases
Solution Approach 1:
The patent extracts the essential diagnostic function from complex emissions models by using only the integral of parameters that correlate to particle emissions. This selective extraction maintains diagnostic reliability while significantly reducing software complexity and computational requirements.
Solution Approach 2:
The patent changes the approach from using complex emissions models to using simplified integral parameters. By transforming the diagnostic basis from detailed emissions calculations to integrated parameter accumulation, the system achieves the same diagnostic goal with much reduced software input requirements.
2Measurement precision
If complex emissions models are used to calculate particle emissions, then the measurement precision is improved, but the software application input increases
Solution Approach 1:
The patent extracts only the necessary information for diagnostic purposes from complex emissions models, retaining the essential correlation between engine operating parameters and particle emissions while discarding unnecessary computational complexity.
Solution Approach 2:
Instead of using complete emissions models, the patent applies partial action by using only the integral of correlated parameters. This partial approach provides sufficient measurement precision for diagnostic purposes without the excessive software input required by full models.
3Reliability
If standardized driving cycles are used for exhaust gas monitoring, then the monitoring can be performed, but the adaptability to different operating conditions is reduced
Solution Approach 1:
The patent creates a universal diagnostic method that works across different operating conditions by using the integral of correlated parameters. This integral-based approach is adaptable to various driving cycles and operating scenarios while maintaining reliable exhaust gas limit value monitoring.
Solution Approach 2:
The patent introduces dynamic adaptability by continuously integrating parameters during different operating cycles. The method automatically adjusts to varying operating conditions through the cumulative integral calculation, eliminating the need for standardized driving cycles while maintaining monitoring reliability.
Data Source
AI summary
The invention relates to a method for diagnosing a particle filter used for filtering particles out of the exhaust gas of an internal combustion engine, wherein a collecting particle sensor is disposed downstream of the particle filter in the direction of flow of the exhaust gas and wherein a measurement for the loading of the particle sensor is determined from an output signal of the particle sensor. Provision is thereby made for the temporal integral of a parameter correlating to the particle emissions of the internal combustion engine to be formed during a measurement cycle, for the measurement for the loading of the particle sensor to be associated with the integral at least one measurement point in time during the measurement cycle and for a defective particle filter to be suggested if the measurement for the loading of the particle sensor is higher than a loading threshold value associated with the integral or if the integral is lower than an integral threshold value associated with the measurement for the loading of the particle sensor. The invention further relates to a device for carrying out the method. The method and the device allow for the diagnosis of the functionality of a particle filter in the exhaust gas of an internal combustion engine during any operating conditions passed through by the internal combustion engine.