Study of a Exhaust After-Treatment System Applied to Hybrid Vehicle

2011 ◽  
Author(s):  
Ye Tian ◽  
Wei Sun ◽  
Dawei Qu ◽  
Lianxu Wang
Keyword(s):  
Hybrid Vehicle ◽  
Treatment System ◽  
Exhaust After Treatment

scholarly journals Failure Analysis of Strap Joint

2019 ◽  
Vol 8 (10) ◽  
pp. 1387-1392
Keyword(s):  
Plastic Deformation ◽  
Contact Pressure ◽  
Maximum Stress ◽  
Exhaust System ◽  
Paper Analysis ◽  
Treatment System ◽  
Heat Shield ◽  
Multiple Issues ◽  
Localized Plastic Deformation ◽  
Exhaust After Treatment

In Exhaust after treatment system strap joint is used for mounting sensor table on which DP, NOx, EGTS, PIN sensors are mounted. While, assembling the sensor table on exhaust system using strap joint multiple issues raised. In which, Strap Bolt Loosening Issue during Vibration Test, Plastic Deformation of Heat shield (outer body) and Bottoming Out of the strap. Under Strap contact area plastic deformation of heat shield is due to increasing contact pressure so that needs to check the recommended value of torque to avoid failures. The basic design assembly of straps consists of T bolt, nut, and trunnion with the strap. In this paper analysis and calculations for torque and parameters affecting the system function have been done to minimize the issues. To reduce plastic deformation internal stand support provided which increase the stiffness of heat shield and observed results showing Bridge strap design concept can be helpful to avoid localized plastic deformation near T-bolt. Calculations at assembly load showing maximum stress and contact pressure near the T bolt. Also effect of inertia load described to check slippage of the strap and after treatment system.

scholarly journals Packaging Design, Weld Fatigue analysis and Validation of Diesel Exhaust After-treatment System

2018 ◽  
Vol 8 (2) ◽  
pp. 36
Author(s):  
Sonal Nareddiwar ◽  
Tapobrata Dey ◽  
R. Sunilkumar
Keyword(s):  
Fatigue Life ◽  
Fatigue Failure ◽  
Welded Joints ◽  
Diesel Exhaust ◽  
Bending Moment ◽  
Fatigue Analysis ◽  
Treatment System ◽  
Packaging Design ◽  
Weld Fatigue ◽  
Exhaust After Treatment

Diesel exhaust after treatment system is usually designed to meet stringent packaging constraints and emission norms. After treatment packaging has critical impact on the overall system efficiency and durability since many components in exhaust systems have welded joints. An after treatment inlet and outlet tube joints, connected to engine outlet and Original Equipment Manufacturer (OEM) tailpipe respectively are subjected to vibrations and bending moment leading to fatigue failure at the inlet/outlet welded joints. It has been observed over the years that the prevailing failure modes in after treatment systems are cracked welds at joints between inlet tubes and flanges, outlet tubes and connecting tailpipes. Fatigue failure is a complex and progressive form of local damage which occurs in welded components of exhaust after-treatment systems. Thus, this fatigue failure needs to be estimated accurately and at the early stage of design to save cost and time. But due to geometrical irregularities, compact packaging design and load transfer conditions, it becomes difficult to estimate accurate fatigue strength of the welded areas. Thus weld fatigue analysis, a high cycle fatigue test to validate inlet/outlet module of exhaust system against dynamic overturning bending moment and to calculate the location of minimum weld fatigue life within the inlet welded joints is performed. Weld fatigue analysis uses advanced fatigue assessment technique, BS 7608, Stress x Life (S x N) approach for accurate and precise estimation of welds. The present work deals with reducing the package volume of the after treatment system by applying different concepts, verifying design robustness by FEA simulation using ANSYS 18.2 and validating the structural durability of the system by testing. The objective of the present work is to estimate the fatigue life of the welded structures precisely and accurately, calculate the threshold bending moment to determine whether the design is robust to the bending moment loads seen over course of its life and make design modifications as per simulation result. Further the FEA and testing results of weld fatigue analysis are correlated.

Lube Formulation Effects on Transfer of Elements to Exhaust After-Treatment System Components

2003 ◽  
Author(s):  
W. A. Givens ◽  
W. H. Buck ◽  
A. Jackson ◽  
A. Kaldor ◽  
A. Hertzberg ◽  
...  
Keyword(s):  
Treatment System ◽  
System Components ◽  
Exhaust After Treatment
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