Exhaust Gas Purifying Member Retaining Element Mass Calculation
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Solution Overview
Problem
Existing methods for manufacturing motor vehicle exhaust gas purifying members often result in the exhaust gas purification block being incorrectly retained within the housing over time, leading to ineffective purification due to improper sizing and installation density of the retaining element.
Innovation Solution
A method that involves determining an equivalent mass of the retaining element after a characteristic usage period, calculating a target installation density, and adjusting the housing diameter to ensure correct retention of the purification block, using a material with nonfunctional components that degrade over time, and employing capacitive sensors to measure electrical properties for precise composition determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retaining element is made from a material with nonfunctional components that disappear over time, then the retention effectiveness improves during the characteristic period, but the retaining element mass decreases after the characteristic period leading to incorrect retention
Solution Approach 1:
The patent applies preliminary action by calculating the equivalent mass of the retaining element that accounts for the disappearance of nonfunctional components over the characteristic period. The housing diameter is determined based on this equivalent mass and the target installation density, ensuring that the retaining element provides correct retention throughout the characteristic period before the functional components disappear. This advance calculation prevents retention failure that would occur if the initial mass alone were used for sizing.
2Ease of manufacture
If the housing diameter is determined based on initial mass measurements, then the manufacturing process is simple, but the purification block is incorrectly retained after usage period
Solution Approach 1:
The patent applies parameter changes by transforming the mass parameter from its initial value to an equivalent mass value that reflects the state after the characteristic period. Instead of using the initial mass directly, the method calculates the equivalent mass by accounting for the proportion of nonfunctional components that will disappear. This parameter transformation ensures that the housing diameter is sized correctly for the retention function throughout the characteristic period, resolving the contradiction between manufacturing simplicity and precision.
3Productivity
If the retaining element installation density is not properly controlled, then the assembly process is faster, but the purification block positioning becomes incorrect leading to erosion
Solution Approach 1:
The patent applies preliminary action by determining the target installation density before the assembly process. This target density is used to calculate the required volume of the retaining element and subsequently the housing diameter. By establishing the correct installation density in advance, the method ensures that the purification block will be correctly positioned and retained throughout the characteristic period, preventing erosion and positioning failures while maintaining assembly efficiency.
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 method ensures the purification member maintains optimal retention and longevity by anticipating the mass and density changes of the retaining element, preventing incorrect positioning and erosion, thereby enhancing the purification efficiency and extending the system's lifespan.
Implementation Method 1
measuring a characteristic electrical magnitude of said retaining element; determining the composition from the measured value of said electrical magnitude
Data Source
AI summary
An exhaust gas purifying member comprises a housing an exhaust gas purification block placed in the housing, and an exhaust gas purification block-retaining element inserted in an annular space between the housing and the block. The retaining element is, during manufacture of the member, made from a material including at least one nonfunctional component intended to disappear after a characteristic period of using the member. A method of manufacturing the member comprises assembling the housing, the retaining element, and the exhaust gas purification block to obtain a housing whereof a diameter is equal to a predetermined diameter, and with the installation density of the retaining element being equal to a target installation density after the characteristic usage period of the member.