Segmented pressure buildup method for exhaust gas after-treatment system

Abstract

The invention provides a segmented pressure buildup method for an exhaust gas after-treatment system. The segmented pressure buildup method at least comprises the following steps of: S 0. judging whether an engine is started, and if the engine is started, executing the step S1; S1. carrying out first-stage pressure buildup, to be specific, driving a pump component to operate at the first pump speed, checking whether the outlet pressure of the pump component exceeds a threshold value, if yes, executing the step S3, and if not, executing the step S2; S2. carrying out second-stage pressure buildup, to be specific, driving the pump component to operate at the second pump speed and checking whether the outlet pressure of the pump component exceeds the threshold value, if yes, executing the stepS3, and if not, executing the step Sn; S3. pressure maintaining stage, to be specific, judging whether the pressure maintaining is successful, if yes, the pressure buildup is successful, and if not,executing the step Sn; and Sn. if the first pressure buildup fails, driving the pump component to reversely pump, then carrying out secondary pressure buildup and judging whether the secondary pressure buildup is successful, if yes, the pressure buildup is successful, and if not, the pressure buildup fails.

Description

technical field [0001] The invention relates to a method for building up pressure in stages for an exhaust gas aftertreatment system, and belongs to the technical field of engine exhaust aftertreatment. Background technique [0002] The exhaust of internal combustion engines, especially diesel engines, contains a large amount of nitrogen oxides and particulate matter, causing great pollution to the atmosphere. Today's frequent smog and reduced visibility are closely related to the deteriorating environmental quality, which greatly affects human health. It is urgent to purify emissions, and all countries have specific environmental protection regulations to regulate this. As the country pays more attention to the environment, various laws and regulations have been issued to regulate the exhaust gas treatment of internal combustion engines. [0003] The pressure building strategy of the existing exhaust gas post-treatment system generally only depends on a certain value afte...

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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