Particle Filter Regeneration via Oxygen Content Comparison
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Solution Overview
Problem
Current methods for controlling the regeneration of particle filters in internal combustion engines lack precision in determining when the filter is completely free of soot, leading to potential fuel inefficiencies and increased risk of filter overload or unnecessary regenerations.
Innovation Solution
A method that measures oxygen content upstream and downstream of the particle filter to determine when the filter is free of soot, allowing for precise calculation of soot combustion and correction of mathematical models estimating soot load, while also considering differential pressure and ash accumulation to optimize regeneration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mathematical models and pressure difference measurements are used to estimate soot load, then regeneration control can be implemented, but the precision in determining when the filter is completely free of soot is insufficient
Solution Approach 1:
The patent implements feedback by measuring oxygen content downstream of the particle filter and comparing it with upstream oxygen content. When the downstream oxygen content equals the upstream oxygen content, this provides feedback that the filter is completely free of soot, enabling precise determination of regeneration completion and accurate feedback control of the regeneration process.
Solution Approach 2:
The patent replaces mathematical models and pressure difference measurements with direct oxygen content measurement to determine soot load and regeneration status. This substitution of measurement method provides more accurate and reliable data for controlling the regeneration process.
2Reliability
If regeneration is controlled based on estimated soot load, then the particle filter can be maintained, but fuel consumption increases and the risk of filter overload or unnecessary regenerations occurs
Solution Approach 1:
By continuously monitoring oxygen content downstream and comparing it with upstream values, the system receives accurate feedback on the actual soot load and regeneration status. This enables precise control of regeneration timing and duration, avoiding unnecessary regenerations that waste fuel and preventing filter overload that would compromise performance.
Solution Approach 2:
The system uses the natural oxygen consumption during soot combustion as a self-indicating mechanism. The oxygen content measurement automatically reveals the soot load status without requiring external estimation methods, enabling the system to self-regulate regeneration based on actual conditions rather than estimates.
3Measurement precision
If oxygen content measurement is used to determine soot-free condition, then regeneration completion can be precisely determined, but additional measurement requirements increase system complexity
Solution Approach 1:
The oxygen content measurement system serves multiple functions: it determines soot load status, monitors regeneration progress, and signals regeneration completion. By using a single measurement approach for multiple purposes, the patent avoids adding separate measurement systems while achieving precise regeneration control.
Solution Approach 2:
The oxygen content acts as an intermediary parameter that indirectly indicates soot load and regeneration status. Instead of directly measuring soot, the system measures oxygen consumption during combustion, which serves as a reliable proxy for soot presence and provides precise regeneration completion determination.
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 enhances the accuracy of soot load monitoring and regeneration management, reducing fuel consumption and the risk of filter overload, and enables adaptive correction of estimation models for improved filter performance.
Implementation Method 1
particle filter for collecting particulate matter (soot) generated by the engine
Implementation Method 2
measurements of the pressure difference in the particle filter
Implementation Method 3
soot combustion process, which is generally referred to as regeneration, that occurs when the temperature of the particle filter exceeds a specific value (e.g., 500° C.) and sufficient oxygen is present
Implementation Method 4
a first value is measured for the oxygen content in exhaust gas upstream from the particle filter, and a second value is measured for the oxygen content in exhaust gas downstream from the particle filter
Data Source
AI summary
A method and system controls a regeneration of a particle filter of an internal combustion engine. A first value is measured for the oxygen content in exhaust gas upstream from the particle filter. A second value is measured for the oxygen content in exhaust gas downstream from the particle filter. The particle filter is determined to be free of soot when the second value for the oxygen content is equal to the first value for the oxygen content.