Method for building up pressure in sections of exhaust after-treatment system

Abstract

A method for segmented voltage buildup of a tail gas post-processing system, at least comprising the following steps: S0: a step of determining whether an engine is started or not, and if the engine is started, executing step S1; S1: a first voltage buildup stage: driving a pump assembly to operate in a first pump speed, and detecting whether the outlet pressure of the pump assembly exceeds a threshold or not, if yes, executing step S3, and if not, executing step S2; S2: a second voltage buildup stage: driving the pump assembly to operate in a second pump speed, and detecting whether the outlet pressure of the pump assembly exceeds a threshold or not, if yes, executing step S3, and if not, executing step Sn; S3: a pressure maintenance stage: determining whether pressure maintenance is succeeded or not, if yes, succeeding in voltage buildup, and if not, executing step Sn; and Sn: if the first voltage buildup fails, driving the pump assembly for back suction, then performing the second voltage buildup, and determining whether the second voltage buildup is successful or not, if yes, succeeding in voltage buildup, and if not, failing in voltage buildup.

Description

technical field [0001] The invention relates to a method for building up pressure in sections of an exhaust gas aftertreatment system, and belongs to the technical field of engine exhaust gas aftertreatment. Background technique [0002] The exhaust of internal combustion engines, especially diesel engines, contains a large amount of nitrogen oxides and particulate matter, which causes great pollution to the atmosphere. Today's frequent occurrence of smog, reduced visibility, and worsening environmental quality are closely related to this, which greatly affects human health. It is imperative to purify emissions, and each country has specific environmental regulations to regulate it. As the country attaches more importance to the environment, various regulations have been issued to regulate the exhaust gas treatment of internal combustion engines. [0003] The pressure building strategy of the existing exhaust gas aftertreatment system generally only depends on a certain va...

AI Technical Summary

Problems solved by technology

If a certain value after calibration is used, if the value is set relatively low, those pumps that require high speed will often fail to build pressure; if the value is set relatively high, pumps that originally only need low speed to build pressure Those pumps at such high RPMs create a lot of pressure that can shock the system lines

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