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Fault diagnosis method and device for ternary catalytic converter

A technology of fault diagnosis device and catalytic converter, which is applied in the direction of diagnosis device of exhaust gas treatment device, exhaust device, electronic control of exhaust gas treatment device, etc. problem, to achieve the effect of cost increase, high reliability and reliable fault diagnosis

Active Publication Date: 2018-02-09
BAIC GRP ORV CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] There are many ways to detect the catalytic conversion ability of the three-way catalytic converter, and HC emissions can be directly monitored. This method requires the use of sensors that can directly monitor the HC content in the exhaust gas, but due to high cost and reliability Not enough high-level problems, not many are currently used

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  • Fault diagnosis method and device for ternary catalytic converter
  • Fault diagnosis method and device for ternary catalytic converter
  • Fault diagnosis method and device for ternary catalytic converter

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Embodiment Construction

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

[0041] Next, first combine figure 1 The fault diagnosis method of the three-way catalytic converter according to the embodiment of the present invention will be described.

[0042] Such as figure 1 As shown, the fault diagnosis method of the three-way catalytic converter according to the embodiment of the present invention comprises the following steps:

[0043] Ste...

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Abstract

The invention provides a fault diagnosis method and device for a ternary catalytic converter. The fault diagnosis method comprises the following steps: 1) obtaining a control signal and gas inlet flowgenerated by a front oxygen sensor; 2) based on the control signal and the gas inlet flow, performing analog computation to obtain an analog oxygen sensor voltage signal; 3) computing to obtain analog oxygen sensor amplitude according to the analog oxygen sensor voltage signal; 4) obtaining a voltage signal generated by a rear oxygen sensor; 5) computing measured rear oxygen sensor amplitude according to the voltage signal of the rear oxygen sensor; and 6) based on the analog oxygen sensor amplitude and the measured rear oxygen sensor amplitude, diagnosing whether the catalytic converter hasfaults or not.

Description

technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a fault diagnosis method and device for a three-way catalytic converter. Background technique [0002] The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. It can oxidize harmful gases such as CO (carbon monoxide), HC (hydrocarbons) and NOx (nitrogen oxides) emitted from automobile exhaust. and reduction into harmless carbon dioxide, water and nitrogen to achieve the purpose of purifying tail gas and reducing pollution. [0003] The three-way catalytic converter of the vehicle will gradually crack during normal use, and finally cannot perform three-way catalytic conversion, so that it cannot meet the requirements of national emission regulations. In addition, the improper use of the vehicle will also cause the catalytic converter to fail early, resulting in excessive exhaust gas. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00
CPCF01N11/00F01N2560/025F01N2900/0416Y02T10/40
Inventor 孙国兵李平伟孟怡平
Owner BAIC GRP ORV CO LTD
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