SCR sulfur poisoning degree determination method and device, diesel vehicle and medium

Abstract

The embodiment of the invention discloses an SCR sulfur poisoning degree determination method and device, a diesel vehicle and a medium. The SCR sulfur poisoning degree determination method comprises the following steps: detecting the current accumulated calibration work number of a counter in real time, and obtaining the nitrogen oxide conversion efficiency stored in a current preset data storage space; fitting according to the current accumulated calibration work number and the nitrogen oxide conversion efficiency to obtain a current nitrogen oxide conversion efficiency curve, and determining a current curve slope according to the current nitrogen oxide conversion efficiency curve; and confirming SCR sulfur poisoning degree information matched with the current curve slope from a preset nitrogen oxide conversion efficiency curve. According to the technical scheme provided by the embodiment of the invention, the SCR sulfur poisoning degree can be discriminated in time, and the performance of a post-processing system is ensured.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of vehicle aftertreatment, and in particular to a method and device for determining the degree of SCR sulfur poisoning, a diesel vehicle and a medium. Background technique [0002] National V or National VI diesel engines have higher requirements on oil products, and the sulfur content of oil products in the domestic market varies. High low-quality fuel. [0003] 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 for the DOC (Diesel Oxidation Catalyst, Diesel Oxidation Catalyst), SCR (Selective Catalytic Reduction, select Catalytic Reductor) pollutes its catalyst with sulfur poisoning. After poisoning, the conversion efficiency of DOC to NO decreases, which in turn leads to the weakening of the passive regeneration effect of DPF (Diesel Par...

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Problems solved by technology

[0003]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 DOC (Diesel Oxidation Catalyst, diesel oxidation catalyst), SCR (Selective Catalytic Reduction, selective catalytic reduction device) cause pollution, make its catalyst sulfur poisoned, after poisoning, the conversion efficiency of DOC to NO is reduced, which in turn leads to DPF (Diesel Particulate Filter, diesel particle capture device) the passive regeneration effect is weakened, and at the same time, the conversion efficiency of SCR to exhaust nitrogen oxides will also be reduced, resulting in excessive emissions

[0004]Taking a six-cylinder diesel engine with a displacement of 11.6 as an example, when the post-treatment sulfur poisoning is relatively light, about 20L of diesel is needed for desulfurization regeneration in a single parking, that is, a single desulfurization The regenerated oil costs more than 100 yuan, and the desulfurization regeneration is about 30 minutes for a single parking; when the sulfur poisoning is serious, the desulfurization regeneration requires higher fuel consumption, and the time required for desulfurization regeneration will be extended

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