Remote DOC Layout With Insulated Mid-Pipe for Compact Housings
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Solution Overview
Problem
The challenge of integrating a diesel oxidation catalyst (DOC) into the exhaust system of a transport power system without increasing the size profile of the housing, particularly in confined spaces, while maintaining the catalyst's activation temperature and reducing noise and vibration.
Innovation Solution
Employing an extended mid-pipe with a flexible and insulated member to route exhaust from the prime mover to the DOC, positioned away from the prime mover, ensuring the DOC operates at or above its activation temperature and isolating it from direct vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the DOC is positioned close to the prime mover for compact arrangement, then the housing size is reduced, but the exhaust heat loss increases and the DOC may not reach activation temperature
Solution Approach 1:
The patent positions the DOC away from the prime mover in a remote location along the exhaust flow path, utilizing the longitudinal dimension of the housing rather than compact radial arrangement. This dimensional repositioning allows the DOC to be located downstream where exhaust temperature is maintained, resolving the conflict between compact housing and heat retention.
Solution Approach 2:
The patent introduces an extended mid-pipe as an intermediary component between the prime mover and DOC. This mid-pipe serves as a thermal conduit that transports hot exhaust gases over the extended distance, maintaining temperature despite the increased flow path length, thus enabling remote DOC placement without heat loss.
2Length of stationary object
If the DOC is positioned away from the prime mover to reduce housing depth, then space utilization is improved, but the exhaust flow path length increases causing heat loss
Solution Approach 1:
The patent redistributes component arrangement from a depth-optimized compact stack to a length-optimized linear arrangement. The DOC is positioned downstream along the exhaust path, utilizing the available longitudinal space rather than increasing housing depth, thus reducing housing depth while maintaining functional effectiveness.
Solution Approach 2:
The extended mid-pipe acts as a thermal intermediary that bridges the increased distance between prime mover and DOC. It maintains exhaust temperature over the extended flow path, enabling the DOC to be positioned far from the prime mover without compromising thermal activation.
3Device complexity
If the DOC is mounted directly on the prime mover for simple installation, then device complexity is reduced, but noise and vibration are transmitted to the housing
Solution Approach 1:
The patent extracts the DOC from direct mounting on the prime mover and relocates it to a remote position within the housing. This separation removes the source of vibration and noise (the prime mover) from direct contact with the DOC and housing structure, reducing harmful transmissions while maintaining functional integration through the exhaust flow path.
Solution Approach 2:
The extended mid-pipe and its mounting structure serve as intermediaries that decouple the DOC from the prime mover. This intermediary arrangement allows the DOC to be positioned remotely, isolating it from prime mover vibrations and noise while maintaining the exhaust flow connection.
4Volume of stationary object
If an extended mid-pipe is used to route exhaust to remote DOC, then housing size is reduced, but heat loss along the flow path increases
Solution Approach 1:
The extended mid-pipe is designed as a thermal intermediary with insulation characteristics that minimize heat loss during transport. It serves as a controlled thermal conduit that maintains exhaust temperature over the extended distance, enabling the DOC to be positioned remotely while preventing excessive heat loss to the surrounding environment.
Solution Approach 2:
The patent modifies the thermal parameters of the exhaust flow path by using an insulated extended mid-pipe. This changes the heat transfer characteristics, reducing convective and conductive heat losses along the extended flow path, thereby maintaining sufficient temperature for DOC activation despite the increased distance.
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
The solution effectively maintains the DOC's efficiency in pollutant removal while minimizing the housing's size, reducing heat loss, and damping noise and vibration, thus optimizing space utilization and environmental emissions control.
Implementation Method 1
The extended mid-pipe can be insulated to reduce heat lost along the extended flow path in the extended mid-pipe to provide an exhaust temperature at the DOC that is at or above the activation temperature of the DOC
Implementation Method 2
The extended mid-pipe can be long and flexible and can also dampen noise and vibration created by the prime mover during operation
Data Source
AI summary
A transport power system for generating power is provided. The transport power system includes an extended mid-pipe having a flexible member and an insulated member that is connected to the flexible member. The flexible member is coupled to an exhaust manifold disposed on a diesel prime mover that is configured to generate exhaust. The extended mid-pipe is configured to receive the exhaust from the exhaust manifold. The diesel oxidation catalyst (DOC) is coupled to the insulated member. The transport power system also includes a housing containing the DOC and the diesel prime mover. The DOC is positioned away from the diesel prime mover such that the DOC is configured to be unstacked in a depth direction of the housing. The insulated member is configured to maintain a temperature of the exhaust to at or above an activation temperature of the DOC.