Particulate Matter Filter Heating for Diesel Exhaust Measurement
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Solution Overview
Problem
Existing particulate matter concentration measuring apparatuses face challenges in accurately detecting particulate matter concentration in exhaust gas from diesel engines, particularly due to measurement errors caused by incomplete regeneration of particulate matter detection filters and uneven distribution of heat for regeneration.
Innovation Solution
A particulate matter concentration measuring apparatus with a differential pressure detection unit and a heating unit that applies a controlled calorific value to the upstream side of the particulate matter detection filter, ensuring efficient regeneration and reducing measurement errors by maintaining a 50% or more calorific value input to the upstream side, which makes up about 30% of the filter area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heating unit is provided in the entire particulate matter detection filter, then regeneration is more complete, but device complexity and energy consumption increase
Solution Approach 1:
The heating unit is divided into multiple independent heating elements arranged along the flow direction of the exhaust gas. Each heating element can be independently controlled, allowing selective heating of different regions of the particulate matter detection filter. This segmentation reduces overall device complexity while maintaining effective regeneration through targeted heating zones.
Solution Approach 2:
Different regions of the particulate matter detection filter are heated with different intensities based on local needs. The heating unit applies higher calorific value to upstream regions where particulate matter accumulation is most severe, and reduces heating intensity downstream. This local quality approach ensures complete regeneration where needed while minimizing energy consumption and device complexity.
2Reliability
If uniform heating is applied across the entire filter, then regeneration is more complete, but energy consumption increases
Solution Approach 1:
The heating unit applies non-uniform heating distribution across the particulate matter detection filter, concentrating higher energy input in upstream regions where particulate matter accumulation is greatest. Downstream regions receive reduced heating intensity. This local quality approach achieves complete regeneration in critical areas while minimizing overall energy consumption.
Solution Approach 2:
Instead of applying uniform heating across the entire filter, the system applies excessive heating (higher calorific value) only to the upstream portion where it is most needed for regeneration. This partial action approach ensures regeneration completeness in critical zones while avoiding unnecessary energy consumption in downstream regions where less heating is required.
3Use of energy by moving object
If the heating unit is concentrated in one area, then energy consumption is reduced, but regeneration uniformity deteriorates
Solution Approach 1:
The heating unit is segmented into multiple heating elements distributed along the flow direction of exhaust gas through the particulate matter detection filter. This segmentation allows energy to be concentrated in specific upstream regions while maintaining regeneration uniformity across the entire filter by coordinating multiple heating zones. The segmented approach achieves both energy efficiency and regeneration uniformity.
Solution Approach 2:
The heating unit extends in the flow direction dimension rather than concentrating in a single spatial location. By distributing heating elements along the length of the filter in the flow direction, the system achieves regeneration uniformity across different regions while controlling overall energy consumption through strategic placement and intensity control of each segment.
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 configuration enables accurate and stable measurement of particulate matter concentration with reduced measurement errors, improving the regeneration efficiency of the particulate matter detection filter and enhancing the overall accuracy of particulate matter concentration detection.
Implementation Method 1
The heating unit is configured to apply about 50% or more of a calorific value for heating the particulate matter to an area making up about 30% of the particulate matter detection filter on an upstream side of an exhaust gas flow
Implementation Method 2
The differential pressure detection unit is configured to detect a differential pressure generated between an inlet and an outlet of the particulate matter detection filter
Data Source
AI summary
A particulate matter concentration measuring apparatus configured to measure a particulate matter concentration in exhaust gas includes an exhaust gas extraction line that is branched from an exhaust line and has a flow passage cross-sectional area smaller than that of the exhaust line, a particulate matter detection filter provided in the exhaust gas extraction line and configured to catch particulate matter, a heating unit configured to heat the caught particulate matter, and a differential pressure detection unit configured to detect a differential pressure generated between an inlet and an outlet of the particulate matter detection filter. The heating unit is configured to apply about 50% or more of a calorific value for heating the particulate matter to an area making up about 30% of the particulate matter detection filter on an upstream side of an exhaust gas flow.