Exhaust Sensor Mounting on Catalyst Flange
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Solution Overview
Problem
Conventional internal combustion engine exhaust lines require manual disassembly of fragile temperature sensors for filter cleaning, which is time-consuming and risks damaging the sensor, and existing solutions are costly and bulky.
Innovation Solution
A burnt gas exhaust line design featuring a catalytic converter with two casings joined by fixing flanges, where one casing contains a particulate filter and the other serves as a mounting support for the temperature sensor, allowing for easier filter extraction without manipulating the sensor, which is housed in the first casing between the oxidation catalyst and particulate filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is placed close to the particulate filter inlet for accurate temperature measurement, then measurement precision is improved, but device complexity and cost increase due to separate securing arrangements
Solution Approach 1:
The patent combines the temperature sensor mounting function with the existing fixing flange structure that secures the two casings together. The fixing flange is pierced radially with a bore that houses the temperature sensor base, integrating the sensor mounting into the structural assembly rather than requiring separate mounting hardware. This resolves the contradiction by achieving accurate temperature measurement near the filter inlet while avoiding additional complexity in the securing arrangement.
2Ease of operation
If manual cleaning of the particulate filter requires disassembly of the temperature sensor, then access to the filter is improved, but reliability decreases due to risk of sensor damage
Solution Approach 1:
The patent segments the catalytic converter into two separate casings that can be easily separated from each other using the fixing flanges. The temperature sensor is mounted on the first casing, while the particulate filter is contained in the second casing. This segmentation allows the filter to be accessed and cleaned by simply separating the casings without any manipulation of the temperature sensor, thereby maintaining sensor reliability while improving ease of maintenance operation.
3Measurement precision
If a separate securing arrangement is provided for the temperature sensor to emerge close to the particulate filter, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The fixing flange structure serves multiple functions: it secures the two casings together to form the catalytic converter housing, and simultaneously provides mounting support for the temperature sensor through its radial bore. This multi-functionality eliminates the need for separate sensor mounting brackets or additional securing components, thereby reducing manufacturing complexity and cost while maintaining precise temperature sensor positioning near the particulate filter inlet.
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 design simplifies filter cleaning, reduces the risk of sensor damage, and provides a more cost-effective and compact solution by allowing the particulate filter to be removed without disassembling the temperature sensor, enhancing maintenance efficiency.
Implementation Method 1
an exothermic reaction is caused within the oxidation catalyst to raise the temperature of the burnt gases, so that they enter the particulate filter at a temperature of around 650 degrees Celsius and burn the polluting particles
Implementation Method 2
This oxidizer, also called an oxidizer, is intended to oxidize hydrocarbons and carbon monoxide from fuel combustion and fresh air in the engine combustion chamber
Data Source
Figure 1~2
AI summary
The line has a temperature sensor emerging inside a catalytic converter that includes two envelopes (48, 49) integrated to each other by fastening clips (48A, 49A), where the envelope (49) contains a particle filter (47). The fastening clip (48A) serves as a mounting base to the temperature sensor. The clip is pierced of bore (48C) that houses a base (76) of the sensor. The clip (48A) is placed with respect to the filter such that the sensor emerged between an oxidation catalyst (46) and the particle filter is close to the filter.