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Method and device used for monitoring three-way catalyst in engine exhaust system

A technology of three-way catalytic converter and exhaust system, which is applied in the direction of engine components, electronic control of exhaust treatment device, diagnostic device of exhaust treatment device, etc. Issues such as control strategies where conversion efficiency is removed

Active Publication Date: 2016-06-15
WEICHAI POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, if the three-way catalytic converter in the engine's exhaust system is aged or removed, the vehicle's exhaust emissions can be significantly exceeded
There is currently no control strategy for diagnosing the conversion efficiency of the three-way catalyst or / and being removed

Method used

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  • Method and device used for monitoring three-way catalyst in engine exhaust system
  • Method and device used for monitoring three-way catalyst in engine exhaust system
  • Method and device used for monitoring three-way catalyst in engine exhaust system

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Embodiment Construction

[0024] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0025] figure 1 It is a flow chart of the method for monitoring the three-way catalytic converter in the engine exhaust system provided by the present invention. Such as figure 1 As shown, the method for monitoring the three-way catalytic converter in the engine exhaust system provided by the present invention includes: in step S101, adjusting the excess air ratio at the inlet end of the three-way catalytic converter according to the operating parameters of the engine. Next, in step S102, the transition time of the output voltage of the sensor installed at the outlet of the three-way catalytic converter is detected. Next, in step S103, the transition time is ...

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Abstract

The invention discloses a method and device used for monitoring a three-way catalyst in an engine exhaust system. The method comprises the steps that the excess air coefficient of the inlet end of the three-way catalyst is adjusted according to the operation parameters of an engine; the jumping time of output voltage of a sensor installed at the outlet end of the three-way catalyst is detected; the jumping time is compared with the preset nominal time to obtain a comparative result; and according to the comparative result, whether the three-way catalyst is removed or ages is judged, and accordingly monitoring of the three-way catalyst is achieved. The three-way catalyst can be monitored online in real time by actively adjusting the excess air coefficient of the inlet end of the three-way catalyst and detecting the jumping time of output voltage of the sensor installed at the outlet end of the three-way catalyst.

Description

technical field [0001] The invention relates to the field of three-way catalytic converters, in particular to a method and device for monitoring a three-way catalytic converter in an engine exhaust system. Background technique [0002] The three-way catalytic converter (Three-Way-Catalyst) is the most important external purification device installed in the automobile exhaust system. Harmful carbon dioxide, water and nitrogen. When the high-temperature automobile exhaust passes through the external purification device, the purification agent in the three-way catalytic converter will enhance the activity of the three gases, CO, HC and NOx, and prompt them to undergo a certain oxidation-reduction chemical reaction. Among them, CO is oxidized into colorless and non-toxic carbon dioxide gas at high temperature; HC compounds are oxidized into water (H 2 O) and carbon dioxide; NOx is reduced to nitrogen and oxygen. These three harmful gases become harmless gases, so that the aut...

Claims

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Application Information

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IPC IPC(8): F01N11/00
CPCF01N11/007Y02T10/40
Inventor 张娟王震华解同鹏张雷波闫立冰
Owner WEICHAI POWER CO LTD
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