Selective Hydrocarbon Injection for Diesel DPF Regeneration
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Solution Overview
Problem
During diesel particulate filter regeneration, excessive hydrocarbons pass through the exhaust gas recirculation valve and cooler, leading to fouling and plugging, especially during stationary regeneration events, posing a risk to exhaust components.
Innovation Solution
The method involves selectively disabling at least one cylinder during in-cylinder late post injection to reduce hydrocarbon injection near the exhaust gas recirculation valve, thereby minimizing hydrocarbons that pass through to the exhaust gas recirculation cooler and other exhaust components, using an engine control unit to manage cylinder activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in-cylinder late post injection is used to aid DPF regeneration, then regeneration effectiveness is improved, but hydrocarbon leakage through EGRV increases causing fouling of EGRC
Solution Approach 1:
The patent divides the exhaust manifold into multiple zones and selectively activates specific cylinders for post-injection based on EGRV position. When EGRV is open, cylinders that route exhaust through EGRV are disabled for post-injection. When EGRV is closed, all cylinders can perform post-injection. This segmentation approach allows DPF regeneration to proceed effectively while preventing hydrocarbon leakage fouling during EGRV operation.
Solution Approach 2:
The system dynamically adjusts which cylinders perform late post-injection based on real-time EGRV position feedback. The engine control unit continuously monitors EGRV status and modifies post-injection strategy accordingly, enabling the system to adapt between regeneration mode (EGRV closed) and normal operation mode (EGRV open), thus resolving the contradiction between regeneration effectiveness and fouling prevention.
2Productivity
If stationary regeneration is performed, then regeneration efficiency is improved, but hydrocarbon fouling of exhaust components is worsened
Solution Approach 1:
During stationary regeneration events, the system selectively disables specific cylinders from performing post-injection when EGRV is open, while allowing post-injection when EGRV is closed. This targeted approach maintains high regeneration efficiency by ensuring sufficient hydrocarbon delivery to DPF while minimizing hydrocarbon exposure to EGRC during periods when EGRV is open and vulnerable to fouling.
Solution Approach 2:
The system uses feedback from EGRV position sensing to dynamically control post-injection strategy during stationary regeneration. The engine control unit monitors EGRV status in real-time and adjusts cylinder post-injection activation accordingly, creating a closed-loop control system that optimizes both regeneration efficiency and fouling prevention based on actual valve position conditions.
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 reduces hydrocarbon leakage and fouling of exhaust components by controlling hydrocarbon flow during diesel particulate filter regeneration, particularly during stationary events, thereby extending the life of these components.
Implementation Method 1
These hydrocarbons are then catalyzed in a diesel oxidation catalyst ("DOC") to produce heat for the diesel particulate filter ("DPF") to regenerate.
Implementation Method 2
Typically, the DPF can be regenerated by incinerating the soot that is built up therein. Typically, this occurs by heating the DPF to a temperature necessary for incinerating the soot, which is then converted to ash and released as gaseous carbon dioxide.
Data Source
AI summary
A method of selective hydrocarbon injection in in-cylinder late post injection in an exhaust manifold of a diesel engine comprises providing the exhaust manifold of the diesel engine comprising a plurality of cylinders, an exhaust gas recirculation valve disposed adjacent the exhaust manifold, a diesel particulate filter disposed adjacent the exhaust manifold, an exhaust gas recirculation cooler disposed adjacent the exhaust manifold offset from the exhaust gas recirculation valve, and an engine control unit operatively connected with the diesel engine for controlling at least the plurality of cylinders. At least a first cylinder is disabled via the engine control unit to reduce post injection of hydrocarbons during regeneration of the diesel particulate filter. The diesel particulate filter is regenerated. In-cylinder late post injection of hydrocarbons is conducted during regeneration of the diesel particulate filter via cylinders other than the first cylinder.