Diesel Particulate Filter Differential Pressure Verification
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Solution Overview
Problem
The accuracy of diesel particulate filter pressure drop models is compromised by implausible measurement signals due to ice formation in pressure measuring lines, leading to incorrect soot mass calculations and potential damage to the filter during regeneration, as well as increased fuel consumption and engine wear.
Innovation Solution
A method to verify differential pressure values by comparing them to a correction value derived from an extrapolated function of exhaust gas mass flow and uncorrected differential pressure, with a tolerance threshold, to identify and correct for sensor freezing, preventing false calculations and ensuring accurate soot mass determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If differential pressure values are measured using pressure sensors in the exhaust system, then the soot mass can be calculated for regeneration control, but ice formation in the measuring lines causes implausible measurement signals and incorrect calculations
Solution Approach 1:
The patent applies preliminary action by determining a correction value in advance through extrapolation of measured differential pressure values at different exhaust gas mass flows. This correction value, representing the differential pressure at zero mass flow, is calculated before actual operation to compensate for ice formation effects during regeneration, thereby preventing measurement errors rather than correcting them after they occur.
Solution Approach 2:
The patent changes the parameter of differential pressure measurement by introducing a correction value derived from extrapolation. Instead of using raw measured values directly, the system transforms the measurement data by calculating what the differential pressure would be at zero mass flow conditions, thereby compensating for the harmful effects of ice formation in the measuring lines.
2Productivity
If the pressure loss model is used to determine soot mass, then regeneration timing can be controlled, but ice formation leads to incorrect soot mass calculations and potential filter damage
Solution Approach 1:
The correction value is determined in advance through extrapolation of differential pressure measurements taken at various exhaust gas mass flows. This preliminary calculation of the zero-flow differential pressure compensates for ice formation effects before regeneration occurs, ensuring accurate soot mass determination and preventing filter damage from incorrect regeneration timing.
Solution Approach 2:
The system uses feedback by continuously monitoring differential pressure values at different operating conditions (exhaust gas mass flows) and using this information to calculate a correction value. This feedback loop allows the system to adapt to changing conditions and maintain accurate soot mass calculations despite the presence of ice in the measuring lines.
3Measurement precision
If differential pressure sensors are installed to monitor filter loading, then soot accumulation can be tracked, but sensor freezing causes false readings and increased fuel consumption
Solution Approach 1:
The patent transforms the differential pressure measurement parameter by applying a correction value derived from extrapolation. This parameter transformation compensates for sensor freezing effects, allowing accurate soot load tracking without requiring additional energy-intensive heating measures, thereby avoiding increased fuel consumption.
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 effectively detects sensor freezing, preventing incorrect soot mass calculations and reducing the risk of filter damage, fuel consumption, and engine wear by ensuring accurate differential pressure measurements, thereby improving the reliability of diesel particulate filter regeneration processes.
Implementation Method 1
the first differential pressure base value is determined from an extrapolation of a function which is generated from pairs of values of the exhaust gas mass flow and uncorrected differential pressure value determined during the flow through the diesel particle filter
Data Source
Figure 1~3
AI summary
The method involves comparing a difference between a difference pressure value (deltap) and a correction value (deltapoffset) with a tolerance threshold value, and detecting the difference pressure value as false when the difference is larger than the threshold value. The correction value corresponds to two difference pressure base values at a diesel particle filter in an exhaust gas section of a diesel assembly when exhaust gas does not flow through the filter, where one of the base values is a value determined by measurement at the filter. Independent claims are also included for the following: (1) a method for treating i.e. cleaning, a diesel particle filter (2) a device for verifying a difference pressure value in a diesel particle filter (3) a device for treating i.e. cleaning, a diesel particle filter (4) a computer program for executing a method for verifying a difference pressure value in a diesel particle filter.