Particle Filter Plausibility via Charging Pressure Map
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Solution Overview
Problem
Existing methods for evaluating the plausibility of pressure difference values across particle filters in diesel engines are inadequate, leading to potential over- or under-regeneration, which affects fuel consumption and emission behavior.
Innovation Solution
A method involving a first measuring unit to determine pressure difference and a second to measure charging pressure, with both values stored in a characteristic map to identify incorrect pressure difference values by checking if they fall outside predetermined limits, ensuring accurate plausibility checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods for evaluating pressure difference values are used, then the particle filter can be monitored, but the plausibility checks are insufficient leading to over- or under-regeneration
Solution Approach 1:
The patent introduces charging pressure as an intermediary parameter to validate pressure difference measurements. By comparing the pressure difference value against the charging pressure relationship stored in a characteristic map, the system creates an indirect validation mechanism that improves reliability without requiring complex additional hardware
Solution Approach 2:
The system implements feedback by continuously comparing measured pressure difference values against expected values derived from charging pressure measurements. The characteristic map stores reference relationships, and deviations trigger plausibility checks, creating a closed-loop validation system that enhances monitoring accuracy
2Measurement precision
If pressure difference value quality deteriorates, then regeneration timing becomes inaccurate, but continuous monitoring increases system complexity
Solution Approach 1:
Charging pressure serves as a mediator to indirectly assess pressure difference measurement quality. Instead of directly monitoring measurement quality with complex equipment, the system uses charging pressure as a reference point to validate whether pressure difference readings are plausible, simplifying the monitoring approach while maintaining precision
Solution Approach 2:
The system changes the approach from directly monitoring pressure difference quality to monitoring the relationship between two parameters (pressure difference and charging pressure). By storing characteristic relationships in a map and comparing actual readings against this reference, the system achieves precision through parameter correlation rather than direct quality measurement
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 approach simplifies and enhances the accuracy of plausibility checks for pressure difference values, providing reliable information on their quality and preventing improper regeneration of particle filters.
Implementation Method 1
A pressure difference sensor is used in order to enable the blockage of the particle filter with soot to be measured. Said pressure difference sensor measures the pressure difference between the two ends of the particle filter.
Implementation Method 2
A method involving a first measuring unit to determine pressure difference and a second to measure charging pressure, with both values stored in a characteristic map to identify incorrect pressure difference values
Data Source
AI summary
In a method for achieving plausibility of a pressure difference value by means of a particle filter, a pressure difference value is allocated to each charging pressure of the internal combustion engine. As a result, the identification of a faulty pressure difference value occurs when the detected pressure difference value is outside a limit range of the detected charging pressure value.