Diesel Engine DPF-SCR Layout for Easier Maintenance Access
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Solution Overview
Problem
The maintenance of diesel engines is hindered by the need to frequently remove DPF and SCR components when they are positioned above maintenance parts, making efficient inspection and repair difficult.
Innovation Solution
The DPF and SCR are arranged in a T or L shape, with the DPF extending in the engine front-rear direction and the SCR orthogonal to it, increasing the available space above the engine and allowing maintenance without removal, and using a common bracket to secure both components to the cylinder head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the DPF and SCR are arranged above the engine in the conventional side-by-side configuration, then the exhaust after-treatment function is achieved, but the maintenance area above the engine is reduced making inspection and repair difficult
Solution Approach 1:
The patent transitions from a two-dimensional side-by-side arrangement to a three-dimensional stacked configuration. The DPF is positioned above the SCR, utilizing the vertical dimension to arrange exhaust after-treatment components. This dimensional change increases the horizontal maintenance area above the engine while maintaining all necessary exhaust treatment functions, allowing technicians to access maintenance parts without removing the DPF or SCR.
2Device complexity
If the DPF and SCR are arranged side by side in the same direction, then the layout is simple, but the available space above the engine for maintenance is insufficient
Solution Approach 1:
The patent applies vertical stacking to arrange the DPF above the SCR, transforming the horizontal side-by-side layout into a vertical stacked configuration. This utilizes the up-down dimension to maximize the horizontal maintenance area above the engine, providing sufficient space for technician access and tool placement while maintaining a compact overall structure.
Solution Approach 2:
The patent employs asymmetric arrangement where the DPF and SCR are positioned at different vertical levels rather than symmetrically side by side. The DPF extends in the engine width direction while the SCR is positioned below it, creating an asymmetric configuration that optimizes both maintenance accessibility and structural compactness.
3Reliability
If multiple exhaust after-treatment devices are provided, then exhaust purification performance is improved, but the number of components increases making maintenance more difficult
Solution Approach 1:
The patent arranges the DPF and SCR in a vertical stacked configuration with the DPF above the SCR. This three-dimensional arrangement consolidates multiple exhaust treatment components into a compact vertical assembly, improving maintenance accessibility compared to horizontal side-by-side placement while maintaining complete exhaust purification functionality through both devices.
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 configuration enhances maintainability by providing efficient access to maintenance parts and reducing manufacturing costs through shared components and flexible bracket designs.
Implementation Method 1
a DPF that collects particulate matter contained in the exhaust gas
Implementation Method 2
an SCR that reduces nitrogen oxides contained in the exhaust gas by adding urea
Data Source
AI summary
A diesel engine is provided with an exhaust after-treatment device for purifying exhaust gas. The exhaust after-treatment device includes a DPF that collects a particulate matter included in the exhaust gas, and an SCR that reduces nitrogen oxides included in the exhaust gas through addition of urea. The DPF is arranged to extend in an engine width direction orthogonal to both the engine front-rear direction and an up-down direction, on one side of the engine front-rear direction with respect to the DPF. The DPF and the SCR are attached to the diesel engine.