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Accelerated endurance test method for catalytic converter assembly of commercial vehicle

A catalytic converter and durability test technology, applied in the field of accelerated durability test of commercial vehicle catalytic converter converter assembly, can solve problems such as difficulty in accurately evaluating durability performance, and achieve shortened product development cycle, accelerated test process, and good accuracy Effect

Inactive Publication Date: 2012-11-28
SHANGHAI TENNECO EXHAUST SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

More importantly, the commercial vehicle catalytic converter assembly is composed of components such as carrier, liner, sound-absorbing structure and internal auxiliary bracket, so it is obviously difficult to accurately evaluate its durability performance by the existing durability test method for a single component

Method used

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  • Accelerated endurance test method for catalytic converter assembly of commercial vehicle
  • Accelerated endurance test method for catalytic converter assembly of commercial vehicle
  • Accelerated endurance test method for catalytic converter assembly of commercial vehicle

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the drawings and specific examples.

[0029] See figure 1 with figure 2 Because the catalytic converter assembly SCR Box is directly suspended on the chassis of the car by straps and brackets, the SCR Box is regarded as a whole, which meets the conditions of the Single Degree of Freedom (Single Degree of Freedom, referred to as SDOF) assumption. Domain acceleration theory. Combine image 3 Given the application frequency domain acceleration theory to calculate the SCR box bench test acceleration power spectral density (Power Spectral Density, referred to as PSD) calculation process, the frequency domain acceleration test method for evaluating the durability of SCR box can be divided into the following steps:

[0030] The first step is to preprocess the acceleration signal collected by the automobile test field to remove burrs, zero drift and other abnormal signals. Figure 4 The processed time-domain ...

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Abstract

The invention discloses an accelerated endurance test method for a catalytic converter assembly of a commercial vehicle. The method comprises the steps of: collecting time domain acceleration signals by using a test track road based on a principle of same failure mode and equivalent damages; carrying out synthesis and accelerated computing to obtain an acceleration power spectral density (PSD) so as to guide an electromagnetic vibration bench to carry out a frequency domain accelerated test method of random vibration on the catalytic converter assembly. By using the method, vibration bench tests and test track road tests are correlated; because of the same failure mode and equivalent damages, the test time is greatly shortened, the endurance development cycle of a product is reduced, and the test cost is lowered; and the accelerated endurance test method has the three remarkable advantages of economy, practicability and accuracy.

Description

Technical field [0001] The invention relates to a test method, in particular to an accelerated durability test method of a commercial vehicle catalytic converter converter assembly. Background technique [0002] The selective catalytic converter SCR (Selective Catalytic Reduction) technology has the advantages of reducing NOx, improving fuel consumption, and having strong anti-sulfur poisoning ability. Therefore, the installation of SCR aftertreatment system is a high-power diesel engine that meets the NOx emissions in the National IV and National V standards. Require a more ideal way. However, the catalytic converter assembly (SCR box) is large in size, high in quality, and expensive. During the use of the car, it is subject to engine vibration, road vibration and high temperature, and the use environment is very harsh, so the durability design requirements are very high. . In order to improve product durability, shorten product development cycle and reduce costs, it is usuall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02G01M17/007
Inventor 严家武崔京宝包友霞樊坚强
Owner SHANGHAI TENNECO EXHAUST SYST
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