Integrated DPF SCR Engine Exhaust System Vibration
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Solution Overview
Problem
Existing engine devices for work vehicles face challenges in maintaining exhaust gas temperature for effective regeneration of diesel particulate filters and selective catalyst reduction, leading to inefficiencies in maintenance and compactness due to separate mounting of DPF and SCR cases, which complicates assembly and maintenance.
Innovation Solution
The engine device integrates a diesel particulate filter (DPF) and a urea selective catalyst reduction (SCR) system via a urea mixing pipe, allowing for integral vibration and compact configuration, reducing the need for vibration-proof coupling and simplifying maintenance by allowing the DPF to be separated without removing the entire unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the DPF case and SCR case are assembled while being separated from the engine, then the exhaust gas temperature is reduced, but the regeneration of diesel particulate filter and selective catalyst reduction are incomplete
Solution Approach 1:
The exhaust gas temperature maintaining structure is built into the DPF case and SCR case before assembly, allowing the cases to be pre-assembled with temperature maintenance capability. This preliminary action ensures that when the cases are assembled to the engine, the exhaust gas temperature is maintained at a high degree, enabling complete regeneration and chemical reaction without requiring the cases to be assembled separately from the engine.
2Stability of the object's composition
If the DPF case and SCR case are mounted on two parallel base frames, then the mounting structure is stable, but the supporting posture cannot be maintained due to machining errors
Solution Approach 1:
The DPF case and SCR case are merged into a single integrated exhaust gas purification device that is mounted as one unit on the engine. This merging eliminates the need for two separate base frames and reduces the number of mounting interfaces, thereby avoiding the accumulation of machining errors that would occur with multiple separate mounting points. The integrated structure maintains stable supporting posture while simplifying the mounting system.
3Ease of repair
If the whole DPF case is detached for cleaning the diesel particulate filter, then the filter can be accessed, but the cleaning process is time-consuming and complex
Solution Approach 1:
The DPF case is segmented into removable sections or the diesel particulate filter is made independently accessible through a removable cover or access panel. This segmentation allows the filter to be detached and cleaned without removing the entire DPF case, significantly reducing cleaning time and complexity while maintaining easy access to the filter for maintenance operations.
4Temperature
If the SCR case is installed on the lateral side of the engine, then the exhaust gas temperature is maintained, but the engine room becomes less compact
Solution Approach 1:
The SCR case is positioned to overlap with the DPF case in the longitudinal direction, with the exhaust gas flowing from the DPF case into the SCR case. This nested arrangement allows both purification devices to occupy a more compact space within the engine room while maintaining the exhaust gas temperature through close proximity to the engine, effectively solving both the temperature maintenance and compactness requirements.
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 integration simplifies maintenance, reduces costs by eliminating the need for vibration-proof components, and enhances assembly workability while maintaining efficient exhaust gas purification, even in compact engine rooms.
Implementation Method 1
a first case for removing particulate matter in exhaust gas of an engine
Implementation Method 2
a second case for removing nitrogen oxides in the exhaust gas of the engine
Implementation Method 3
a urea selective catalyst reduction (SCR) system
Data Source
Figure 1
Figure 2
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AI summary
It is an object to provide an engine device for a work vehicle, in which an engine 1, a first case 28, and a second case 29 can be constituted in the same vibration structure, and exhaust gas path structure between the engine 1] and the second case 29 can be constituted in such a manner as to reduce costs. The engine device for a work vehicle according to the present invention of the instant application includes the first case 28 for removing particulate matter in exhaust gas of the engine 1 and the second case 29 for removing nitrogen oxides in the exhaust gas of the engine 1, and configured to connect the first case 28 to the second case 29 via a urea mixing pipe 39. The engine 1, the first case 28, and the second case 29 are integrally adhered, and the engine 1, the first case 28, and the second case 29 are configured to be integrally vibrated in a swingable manner.