Exhaust Filter Resistance-Based Regeneration Control
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Solution Overview
Problem
Existing exhaust purifying apparatuses face challenges in efficiently executing filter regeneration and soot burning processes, leading to decreased particulate matter trapping performance due to soot deposition in filters and gaps between filter and exhaust pipe, which affects insulation resistance and overall system efficiency.
Innovation Solution
An exhaust purifying apparatus with a filter device made of electrically conductive material, equipped with electrodes and a controller that determines the need for filter regeneration or soot burning processes based on resistance values, using energy supplied by a fuel adding valve to heat the filter and eliminate soot, with the filter regeneration process consuming more energy due to its complexity and soot hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter regeneration process is executed frequently to maintain particulate matter trapping performance, then soot removal effectiveness is improved, but fuel consumption increases
Solution Approach 1:
The system uses insulation resistance value feedback to determine when to execute filter regeneration or soot burning processes. The controller continuously monitors the insulation resistance value and compares it against threshold values (first determination value and second determination value) to intelligently decide the appropriate maintenance process, avoiding unnecessary fuel consumption while maintaining filter performance
Solution Approach 2:
The system changes operational parameters (energy supply amount and process type) based on the measured insulation resistance value. When the resistance value is below the first determination value, filter regeneration with higher energy supply is executed. When the resistance value is between the first and second determination values, soot burning with lower energy supply is executed. This parameter adaptation optimizes fuel consumption based on actual filter condition
2Reliability
If the soot burning process is executed to remove soot from gap portions, then insulation resistance is improved, but fuel consumption increases
Solution Approach 1:
The system applies partial action by selecting different maintenance processes based on the degree of soot deposition. Not all filter maintenance requires full filter regeneration; when only gap portions are clogged (insulation resistance between first and second determination values), a partial soot burning process is sufficient, consuming less fuel than complete filter regeneration
Solution Approach 2:
The controller uses insulation resistance value feedback to determine when soot burning is needed. By monitoring the resistance value and comparing it to the second determination value, the system executes soot burning only when insulation resistance degradation is detected, avoiding unnecessary fuel consumption while maintaining proper insulation
3Reliability
If the filter regeneration process consumes more energy than soot burning, then complete soot removal is achieved, but system efficiency decreases
Solution Approach 1:
The system dynamically selects between filter regeneration and soot burning processes based on real-time insulation resistance measurements. This dynamic adaptation allows the system to apply the appropriate level of treatment (full regeneration or partial soot burning) rather than always using the more energy-intensive filter regeneration, thereby improving overall system efficiency while maintaining effective soot removal
Solution Approach 2:
The system changes the energy supply parameter based on the required maintenance level. Filter regeneration uses a larger energy supply amount for complete soot removal, while soot burning uses a smaller energy supply amount for gap portion cleaning. This parameter change based on actual need improves system efficiency by avoiding excessive energy 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
The apparatus effectively maintains particulate matter trapping performance by timely execution of filter regeneration and soot burning processes, reducing fuel consumption and preventing unnecessary fuel usage, while ensuring quick response to insulation resistance decreases, thus enhancing overall system efficiency and soot removal.
Implementation Method 1
a particulate matter trapping filter arranged in an exhaust pipe of an internal combustion engine, the filter being made of an electrically conductive material; and two electrodes fixed to an outer surface of the filter
Implementation Method 2
a resistance value obtaining unit configured to obtain an electrical resistance value between the two electrodes
Implementation Method 3
an energy supplying unit configured to supply energy converted into heat received by the filter
Implementation Method 4
a filter regeneration process eliminating soot deposited in the filter with the energy supplied by the energy supplying unit
Implementation Method 5
a soot burning process eliminating soot deposited in a gap portion between the filter and the exhaust pipe with the energy supplied by the energy supplying unit
Data Source
AI summary
A controller controls energization of a filter and a fuel addition valve in an exhaust purifying apparatus. The controller executes a filter regeneration process when an electrical resistance value between two electrodes fixed to an outer surface of the filter is less than a predetermined regeneration determination value. The controller executes a soot burning process when the electrical resistance value is greater than or equal to the regeneration determination value and less than a soot burning determination value, which is set in advance to be larger than the regeneration determination value.