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Three way catalytic converter critical aging test method

A three-way catalytic converter and aging test technology, which is applied in the testing of machine/structural components, instruments, and engines, etc., can solve the problems of poor response time of oxygen sensors, and achieve the effect of low cost and shortened development time.

Active Publication Date: 2008-01-16
BYD CO LTD
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Problems solved by technology

Then, when doing EOBD, it is necessary to calibrate the response time difference of the oxygen sensor under the emission critical state

Method used

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  • Three way catalytic converter critical aging test method
  • Three way catalytic converter critical aging test method

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Embodiment Construction

[0026] The present invention will be further described in detail through specific embodiments below.

[0027] Step 1: Determine the test control conditions;

[0028] According to the chemical properties of the three-way catalytic converter, when the operating temperature is 700°C-800°C, the combustion products of the mixture gas under the closed-loop control of EMS and the combustion products of the mixture gas are lean, which will easily cause the three-way catalytic converter to age. According to the research of Delphi (delphi), under the working condition of lean mixture, the working time of the catalytic converter shall not exceed 1% of its life time; and according to the technical requirements and test methods of GB / T18377 gasoline vehicle catalytic converter , it was decided to use an engine test bench to age the three-way catalytic converter.

[0029] The experimental control conditions are as follows:

[0030] serial number

Condition

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Abstract

A critical aging testing method for three-way catalytic converters comprises the following steps: step 1: determining the test control conditions of fast aging working state and test conditions of the common engine performance test bench; step 2: controlling the working state of the engine on the test bench according to the test control conditions, allowing the aging of the test sample; step 3: evaluating the catalytic conversion rate at a given time interval on the bench until the desired catalytic conversion rate is reached; step 4: loading the catalytic converter on a car, testing the exhaust emission of the whole car until the critical value; and step 5: analyzing the relationship between the catalytic conversion rate and the critical aging. The invention can predict the exhaust emission of the vehicle after driving tens of thousands kilometers within a short time period, greatly shorten the development time of vehicle exhaust system, and efficiently exerts the advantages of the bench test and whole car test. Additionally, the method has low cost and meets the EU III emission standards.

Description

【Technical field】 [0001] The invention relates to a critical aging test method for a three-way catalytic converter. 【Background technique】 [0002] European On Board Diagnostics (EOBD) is the abbreviation of European On Board Diagnostics. It is similar to the second generation of On Board Diagnostics (OBD II), but it pays more attention to emission control. It was promoted and used on January 1, 2001. By definition, it is an "on-board diagnostic system for emission control" and must be able to identify the likely extent of a malfunction through failure codes stored in computer memory. Usually, when the emission is about to exceed the standard (that is, the critical state of emission control), an alarm signal must be output to notify the driver. Whether the emission is facing exceeding the standard can be judged by the response time difference of the oxygen sensor installed before and after the three-way catalytic converter when the concentration changes. Then, when doing E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M19/00G01M15/00G01M99/00
Inventor 张明朗温和钦王源增谢世滨
Owner BYD CO LTD
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