Two-Phase CDPF Regeneration Algorithm for Soot Removal
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Solution Overview
Problem
Existing methods for regenerating catalytic diesel particulate filters (CDPFs) often leave significant amounts of soot remaining near the front and sides, leading to incomplete regeneration and reduced effectiveness due to uncontrolled combustion and thermal damage.
Innovation Solution
A two-phase regeneration method is implemented, where the first phase involves increasing temperature and oxygen content at the CDPF entrance to initiate soot combustion, followed by a second phase with further fuel and oxygen addition to fully oxidize remaining soot, managed by an algorithm in the Engine Control Module to prevent thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-phase regeneration is used to prevent thermal damage, then thermal damage is avoided, but soot removal completeness deteriorates
Solution Approach 1:
The regeneration process is divided into two distinct phases: a first phase that controls temperature to prevent thermal damage, and a second phase that aggressively removes remaining soot. This segmentation allows each phase to optimize for its specific goal without compromising the other.
Solution Approach 2:
The first phase performs preliminary soot combustion at controlled temperatures, removing the bulk of soot while preventing thermal damage. This preliminary action prepares the system for the second phase, which then targets the remaining soot more effectively.
2Reliability
If temperature is maintained at target value during single-phase regeneration, then thermal damage is prevented, but soot oxidation completeness deteriorates
Solution Approach 1:
The regeneration process uses dynamic temperature control with two distinct temperature profiles: a controlled target temperature during the first phase for safety, and an increased temperature during the second phase for complete soot oxidation. This dynamic adjustment optimizes both protection and effectiveness.
Solution Approach 2:
The system changes key parameters (temperature and oxygen content) between phases. The first phase uses moderate temperature and oxygen levels for controlled combustion, while the second phase increases both parameters to ensure complete soot removal from all CDPF regions.
3Ease of operation
If fixed schedule regeneration is used, then operational simplicity is maintained, but incomplete regeneration occurs
Solution Approach 1:
The fixed schedule regeneration is segmented into two phases with distinct objectives and control strategies. This segmentation allows the system to maintain operational simplicity while achieving complete soot removal through the coordinated action of both phases.
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 achieves nearly complete soot removal, restoring approximately 95% of the filtration capacity and preventing thermal damage to the CDPF, compared to single-phase regeneration which leaves about 40% of soot remaining.
Implementation Method 1
oxidation of the soot remaining near the entrance the sides of the CDPF
Implementation Method 2
the temperature and oxygen content of the exhaust gas is increased at the entrance to the CDPF
Data Source
AI summary
A method for regeneration of a CDPF disposed in the exhaust stream of a diesel engine. The method includes a second phase operation following a first phase substantially as disclosed in the prior art. As the first phase ends, as indicated by a temperature sensor at the exit end of the CDPF, the temperature and oxygen content of the exhaust gas are increased at the entrance to the CDPF in an ensuing second stage. These increases cause oxidation of the soot remaining near the entrance and the sides of the CDPF, resulting in a cleaner and higher-capacity CDPF than is produced by a single-phase regeneration in the prior art. The sequential stages are implemented via an algorithm programmed into an Engine Control Module (ECM). A CDPF regenerated in accordance with the invention can have approximately 95% of its filtration capacity restored.