A method, device and system for controlling post-processing efficiency

Abstract

The invention provides a control method, device and system of post processing efficiency. The control method of post processing efficiency is applied to the system of post processing efficiency, wherein the system comprises a DOC module, a DPF module and a SCR module, and the DOC module, the DPF module and the SCR module are connected through a gas exhaust piping. An electronic control deflation valve supercharger is arranged between the DOC module and a turbine. The control method comprises the steps that the electronic control deflation valve supercharger is controlled to turn on based on aregeneration request of the DPF module, an engine state and an upper temperature of the SCR module, and thus front exhaust of the turbine is made to enter the gas exhaust piping through a branch of the electronic control deflation valve supercharger. The front exhaust of the turbine is made to enter the gas exhaust piping, thus air inlet temperature is increased, the activity of catalysts can be accelerated by increasing the temperature, the post processing efficiency is further improved, the amount of crystallized urea in the post processing is reduced, and the problem of white smoke in the reactivation process is solved fundamentally.

Description

technical field [0001] The present application relates to the field of control, in particular to a method, device and system for controlling post-processing efficiency. Background technique [0002] At present, based on emission requirements, it is necessary to install after-treatment equipment on the engine, and convert the emissions generated by the engine through the carrier catalyst inside the after-treatment equipment. [0003] However, the inventors found that under conditions such as cold start of the engine or long-time idling, the temperature of the internal carrier of the aftertreatment is low, and the activity of the catalyst is low. When these working conditions transition to the normal driving conditions of the engine, the activity of the catalyst will have a long activation process, resulting in increased engine emissions and the problem of "white smoke" during the regeneration process. In addition, the thermal management efficiency in the current aftertreatme...

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Problems solved by technology

[0003] However, the inventors have found that under conditions such as engine cold start or long-time idling, the aftertreatment internal carrier temperature is low and the catalyst activity is low

When these working conditions transition to the normal driving condition of the engine, the activity of the catalyst has a long activation process, resulting in increased engine emissions and the problem of "white smoke" during the regeneration process.

In addition, the thermal management efficiency in the current aftertreatment is poor, which will cause excessive engine fuel consumption

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