A system and control method for regenerating dpf by using ntp cycle

Abstract

The invention discloses a system and a control method for regenerating a DPF by using NTP circulation, and relates to the field of tail gas treatment. The system includes an ECU, a post-processing device, an NTP generation module, a cycle temperature control module and a control module; Provide the temperature required for the regeneration process; during the DPF regeneration process, the temperature inside the DPF is adjusted by the circulation temperature control module; the NTP generation module can select different gas sources to generate NTP, and oxidize and remove the PM deposited in the DPF; the NTP generation module contains the circulating air The circulation inlet pipe controlled by the valve forms a circulation passage in a timely manner so that unreacted NTP can be recycled; the control module controls the opening and closing of the electromagnetic valve to open or close the circulation passage in due course to realize three working modes, namely general regeneration mode, booster Switch between pressure preparation mode and boost cycle mode. The invention can effectively improve the utilization rate of NTP, save the gas supplied by the gas source, reduce the regeneration cost and improve the regeneration efficiency.

Description

technical field [0001] The invention belongs to the technical field of post-treatment of diesel engine exhaust, and in particular relates to a system and a control method for regenerating DPF by using NTP cycle. Background technique [0002] Compared with gasoline engines, diesel engines have obvious advantages in power performance, economy and reliability, etc., and are mostly used in heavy transport vehicles, heavy construction machinery and other fields. In recent years, with the gradual improvement of the emission and noise performance of diesel engines, the application of diesel engines in the field of light vehicles is increasing. Among the pollutants emitted by diesel engines, the emission of particulate matter (particulate matter, PM) is the most prominent, which is about dozens of times that of gasoline engines. After PM is discharged into the atmosphere, it will absorb toxic and harmful substances such as acid oxides, viruses and bacteria, and enter the human body...

AI Technical Summary

Problems solved by technology

[0007] When NTP regenerates the DPF off-line, due to the short residence time of NTP in the DPF and insufficient contact, the reaction rate of the NTP active material in the actual regeneration process is low, and the utilization rate is low.

In order to achieve a better regeneration effect, the method of prolonging the regeneration time or increasing the NTP concentration is usually adopted, but new problems such as low NTP utilization rate, increased energy consumption, and increased cost may occur.

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