DPF Regeneration Control Device for Diesel Exhaust

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Solution Overview

Problem

Existing exhaust treatment devices for diesel engines cannot freely release the cancel state of automatic DPF regeneration processing, leading to prolonged cancel periods and potential thermal damage to the DPF due to rapid and strong combustion of excess PM during regeneration.

Innovation Solution

An exhaust treatment device with a DPF regeneration control system that includes a permission or prohibition selection device, allowing for the release of the cancel state and notification of excessive PM accumulation, enabling accurate PM accumulation estimation and prevention of thermal damage by restarting regeneration based on updated estimates and recommendations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the cancel state of automatic DPF regeneration processing cannot be freely released, then the DPF can be protected from frequent regeneration, but the cancel period becomes long and excess PM accumulates causing thermal damage during regeneration

Engineering Contradiction:

ImproveDPF protection from frequent regenerationVSAvoidthermal damage to DPF

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts the regeneration control state between active and canceled based on real-time PM accumulation levels. When PM accumulation exceeds a threshold during a canceled state, the system automatically transitions back to active regeneration, allowing flexible adaptation to changing conditions while preventing thermal damage from excessive PM accumulation

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control device continuously monitors PM accumulation amount and uses this feedback to determine whether to maintain or cancel the regeneration state. This feedback mechanism ensures that the system responds appropriately to actual DPF conditions, preventing both unnecessary regeneration and dangerous PM accumulation

Inventive Principle:

Principle #23Feedback

2Productivity

If automatic DPF regeneration processing is executed based on PM accumulation estimation, then PM is effectively removed, but the system cannot adapt when regeneration should be prohibited or permitted

Engineering Contradiction:

ImprovePM removal efficiencyVSAvoidadaptability to regeneration permission/prohibition conditions

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The system changes the control parameter from a fixed regeneration schedule to a dynamic state based on PM accumulation thresholds and permission/prohibition conditions. This allows the regeneration process to be activated or canceled based on actual DPF needs and operational constraints, improving both efficiency and adaptability

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP2551502B1Exhaust treatment device for a diesel engine

Publication Date: 2019.10.16 KUBOTA CORP

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AI summary

The disclosed exhaust treatment device for a diesel engine can prevent heat damage to a DPF when regenerating said DPF. If a selection device(7), which selects whether to allow or prohibit an automatic DPF regeneration process, is set to prohibit the automatic DPF regeneration process, a DPF regeneration control device(4) is made able to start a process to cancel execution of the automatic DPF regeneration process. If the selection device(7) is set to allow the automatic DPF regeneration process, the DPF regeneration control device(4) retracts the cancellation of the automatic DPF regeneration process, allowing execution of the previously-cancelled automatic DPF regeneration process to begin.