A monitoring method for catalyst poisoning in aftertreatment system of diesel engine
A post-treatment and catalyst technology, which is applied in the electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, exhaust gas treatment, etc., can solve problems such as customer and enterprise losses, catalyst poisoning, and pollution of after-treatment systems. Achieve the effect of improving diagnostic accuracy, easy implementation, and simple calibration
Active Publication Date: 2022-04-05
WEICHAI POWER CO LTD
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Problems solved by technology
The use of high-sulfur fuel oil in diesel engines will lead to a large amount of sulfur compounds in the exhaust gas, which will cause serious pollution to the after-treatment system, especially the SCR (Selective Catalytic Reductor) of the after-treatment system of the diesel engine, causing its catalyst to be poisoned. The conversion efficiency of nitrogen oxides in exhaust gas will decrease, leading to excessive emissions, and irreversible failure after long-term poisoning. Frequent failures of after-treatment failures caused by poisoning in the market will bring certain losses to customers and enterprises.
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[0063] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0064]like figure 1 As shown, a kind of monitoring method of catalyst poisoning of diesel engine post-treatment system is based on the monitoring system of catalyst poisoning of diesel engine after-treatment system. Connected temperature sensor 1, upstream NOx sensor 2 and downstream NOx sensor 3, temperature sensor 1 is used to collect the upstream temperature of the SCR catalytic converter, upstream NOx sensor 2 is used to measure the NOx value upstream of the SCR catalytic converter, and downstream NOx sensor 3 is used to measure The NOx value downstream of the SCR catalyst is used to calculate...
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The invention discloses a method for monitoring catalyst poisoning of a diesel engine post-treatment system, and relates to the field of diesel engines. The method judges whether fuel filling has been carried out, and compares the nth fuel filling with the n-1th fuel filling after The SCR conversion efficiency in different working condition ranges is used to judge whether high-sulfur fuel is introduced in the nth fuel filling. If the SCR efficiency deviation ΔS is greater than the preset SCR efficiency deviation limit ΔSmax, poisoning is determined and the poisoning flag is set to Flag2 Assign a value of 1; otherwise, assign a value of 0 to the poisoning flag Flag2. It can be seen that the present invention can monitor catalyst poisoning in time so as to deal with it in time.
Description
technical field [0001] The invention relates to the technical field of diesel engines, in particular to a method for monitoring catalyst poisoning in an aftertreatment system of a diesel engine. Background technique [0002] Diesel engines with National V emission standards or National VI emission standards have higher requirements on oil products, and the sulfur content of oil products in the domestic market varies. In actual use, some users still use National III emission standards, National IV emission standards and even low-quality fuel with particularly high sulfur content. The use of high-sulfur fuel oil in diesel engines will lead to a large amount of sulfur compounds in the exhaust gas, which will cause serious pollution to the after-treatment system, especially the SCR (Selective Catalytic Reductor) of the after-treatment system of the diesel engine, causing its catalyst to be poisoned. The conversion efficiency of nitrogen oxides in the tail gas will decrease, res...
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IPC IPC(8): F01N11/00F01N3/20F02B77/08
CPCY02T10/12Y02T10/40
Inventor 赵德财魏京孙善良
Owner WEICHAI POWER CO LTD