Multi-section tail gas post-treatment control method

Abstract

The invention discloses a multi-section tail gas post-treatment control method, and belongs to the technical field of engine exhaust tail gas post-treatment. The method comprises the following steps of (1) determining the number of post-treatment sections, connected into an exhaust system, of a multi-section tail gas post-treatment device under a working condition; (2) determining the priority of connection of each single-section post-treatment unit; (3) controlling pipeline switching of a pipeline switching unit according to the determined section number and the priority level of connection of the single-section post-treatment units; and (4) re-determining the number of post-treatment sections, connected into the exhaust system, of the multi-section tail gas post-treatment device. Tail gas post-treatment is creatively designed into multi-section treatment, so that the post-treatment sections can be selectively connected into the exhaust system, connection of redundant post-treatment mechanisms is avoided, the back pressure of the engine exhaust system is reduced, the fuel consumption rate of an engine is reduced, economical efficiency is improved, and redundant post-treatment is prevented from bearing heat loads; and therefore, unnecessary aging of a postprocessor is avoided, and the aging speed of the postprocessor is reduced.

Description

[0001] This application is a divisional application of a patent application with the application name of a multi-stage exhaust gas after-treatment device, control device and control method, the application number is 2020111913729, and the application date is 2020.10.30. technical field [0002] The invention relates to the technical field of post-treatment of engine exhaust gas, in particular to a multi-stage tail gas post-treatment control method. Background technique [0003] Traditional engine aftertreatment is usually integrated, that is, the catalyst shell, catalyst, etc. are packaged into a large package; usually, the catalytic conversion efficiency of aftertreatment is extremely high under most of the steady-state and transient operating conditions of the vehicle engine. , the exhaust gas processing capacity of its catalytic converter is obviously overflowing. [0004] Under the condition of high catalytic rate, the excess after-treatment beyond the required amount of...

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Problems solved by technology

[0004] Under the condition of high catalytic rate, the excess after-treatment beyond the required amount of catalyst will increase the back pressure of the engine and increase the fuel consumption rate of the engine on the one hand; , will accelerate the aging of post-processing

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