Coolant-Cooled Doser Mount for Hot Exhaust Conduits
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Solution Overview
Problem
Heat from the exhaust system can damage the dosing module in exhaust aftertreatment systems due to heat transfer from the internal combustion engine and turbocharger.
Innovation Solution
An exhaust conduit assembly with a coolant-cooled doser mount portion that includes an inlet port, channel, and outlet port to reduce heat transfer to the dosing module, allowing it to be positioned closer to the heat source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dosing module is placed close to the exhaust system to improve reductant introduction efficiency, then the effectiveness of exhaust treatment is improved, but the dosing module is damaged by high temperatures
Solution Approach 1:
The patent introduces a coolant channel system as an intermediary between the exhaust conduit and the dosing module. The coolant circulates through channels in the doser mount, absorbing heat from the exhaust system and preventing it from reaching the dosing module, thus protecting it while allowing close placement
Solution Approach 2:
The patent changes the thermal parameter of the doser mount by introducing coolant flow. The coolant temperature and flow rate are controlled to maintain the dosing module temperature within safe operating limits while allowing the exhaust system to operate at high temperatures
2Reliability
If coolant channels are added to the exhaust conduit assembly to protect the dosing module, then the dosing module is protected from heat damage, but the device complexity increases
Solution Approach 1:
The patent merges the coolant cooling function with the exhaust conduit structure by integrating coolant channels directly into the doser mount and exhaust conduit walls. This combination eliminates the need for separate cooling components and reduces overall system complexity
Solution Approach 2:
The doser mount structure serves multiple functions: it provides mechanical support for the dosing module, acts as a coolant heat exchanger, and serves as part of the exhaust conduit structure. This multi-functionality reduces the number of separate components needed
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 coolant-cooled doser mount effectively reduces heat transfer, enabling the dosing module to operate in high-temperature environments and improve the efficiency and effectiveness of the exhaust aftertreatment system by allowing more dosing modules to be integrated, enhancing reductant introduction and dosing accuracy.
Implementation Method 1
Heat from the exhaust system may be transferred to the reductant dosing module, which may damage the dosing module
Implementation Method 2
The inlet port is configured to receive a coolant. The channel is configured to receive the coolant from the inlet port. At least a portion of the channel extends around at least a portion of the injection aperture. The outlet port is configured to receive the coolant from the channel
Data Source
AI summary
An exhaust conduit assembly includes: an exhaust conduit body defining an exhaust flow path; an injection aperture extending through the exhaust conduit body; and a doser mount portion including: an inlet port configured to receive a coolant, a channel configured to receive the coolant from the inlet port, at least a portion of the channel extending around at least a portion of the injection aperture, the channel including a first section and a second section, and an outlet port configured to receive the coolant from the channel. The doser mount portion defines a cavity configured to receive at least a portion of a dosing module and a ridge defines a base of the cavity, wherein the first portion of the channel is disposed adjacent to the cavity and the second portion of the channel is disposed adjacent to the ridge.