Vertical DPF SCR Mounting for Exhaust Temperature Management
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Solution Overview
Problem
The assembly and maintenance of diesel particulate filter (DPF) and selective catalyst reduction (SCR) cases in diesel engines are hindered by temperature reduction issues and machining errors, leading to difficulties in maintaining high exhaust gas temperatures and compact engine designs.
Innovation Solution
An engine device with a supporting stand and joining pipe configuration that allows for adjustable coupling angles and detachable components, including a pipe joint body and spherical or V-band clamp joints, to facilitate easier assembly, maintenance, and temperature management of the DPF and SCR cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the DPF case and SCR case are assembled apart from the engine, then the exhaust gas temperature is reduced, but the reproduction of diesel particulate filter and chemical reaction are defectively made
Solution Approach 1:
The patent positions the DPF case and SCR case in the vertical direction above the engine rather than laterally beside it. This vertical arrangement maintains proximity to the exhaust manifold for high temperature while utilizing the vertical space within the engine room, resolving the contradiction between temperature maintenance and compact installation.
2Temperature
If the DPF case and SCR case are assembled in close proximity to the engine, then the exhaust gas temperature is maintained at high temperature, but the installation space is increased
Solution Approach 1:
The patent utilizes the vertical dimension by placing the DPF case and SCR case above the engine, transforming the lateral space requirement into vertical space utilization. This allows close proximity to the exhaust manifold for temperature maintenance while keeping the horizontal footprint compact.
Solution Approach 2:
The DPF case and SCR case are arranged vertically stacked, with the DPF case positioned above the SCR case. This nesting arrangement consolidates the volume occupied by both cases, reducing the overall space requirement in the engine room while maintaining close proximity to the exhaust source.
3Ease of manufacture
If the DPF case and SCR case are mounted on two parallel base frames, then the mounting structure is provided, but the mounting surface must be formed horizontally which is difficult to support at predetermined posture due to machining errors
Solution Approach 1:
The patent divides the mounting structure into separate supporting legs for each case (DPF case and SCR case), rather than using a single rigid base frame. This segmentation allows each leg to be independently adjusted to compensate for machining errors in the engine surface, enabling precise positioning of each case without requiring a perfectly horizontal mounting surface.
4Ease of repair
If the diesel particulate filter is cleaned or replaced, then the filter maintenance is performed, but the whole DPF case must be detached and disassembled which increases cleaning man-hour
Solution Approach 1:
The DPF case is segmented into a case body and a removable filter assembly. The filter assembly can be detached from the case body without removing the entire DPF case from the engine. This allows maintenance personnel to access and replace the filter quickly by only detaching the filter assembly, significantly reducing cleaning man-hour while maintaining ease of repair.
Data Source
AI summary
An engine device that includes the first case that removes particulate matter in the exhaust gas of the engine and the second case that removes nitride oxides in the exhaust gas of the engine and that connects the second case to the first case via a urea mixing pipe, an upper surface cover body is adhered on the upper portion of the engine via supporting leg bodies, and the upper portion of the engine is covered with the upper surface cover body, while any one or both of the first case and the second case are placed on the upper surface side of the upper surface cover body.