Phased regeneration control method, device and system for diesel particulate filter

Abstract

The invention provides a stage-by-stage regeneration control method, device and system for a diesel particulate filter (DPF). The method comprises the steps of when the DPF needs to be regenerated, acquiring the front end temperature and rear end temperature of the DPF, calculating the first temperature difference of the rear end temperature and the front end temperature, and comparing the first temperature difference with a temperature difference threshold; if the first temperature difference is smaller than the temperature difference threshold, regulating the current target temperature to a second target temperature according to the preset temperature regulating amount after the preset time duration, wherein the current target temperature is smaller than the second target temperature; acquiring the exhaust gas flow of an engine, calculating a second temperature difference of the front end temperature and the second target temperature, determining the first jet quantity of fuel oil according to the exhaust gas flow and the second temperature difference, and then, jetting the fuel oil; and circulating the processes until the regulated target temperature is larger than or equal to the maximum value of the preset target temperature, and then, stopping jetting to finish the stage-by-stage regeneration of the DPF. By using the stage-by-stage regeneration control method, device and system, the reliability and durability of the DPF are improved, and the risk that the DPF is damaged is reduced.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a staged regeneration control method, device and system for a diesel particulate filter. Background technique [0002] Diesel particulate filter (DPF) is an effective means to reduce diesel particulate emissions. As diesel engine emission regulations continue to tighten, DPF has gradually become an indispensable post-treatment device for diesel engines. The DPF carrier is generally made of porous media materials, with an average pore diameter of 10-30 μm. It traps particulate matter in the exhaust of diesel engines through physical filtration and reduces the emission of particulate matter from diesel engines. However, with the accumulation of particulate matter in the DPF pores, the pressure drop of the DPF will become larger and larger, which will increase the exhaust back pressure of the engine, worsen the fuel consumption of the engine, and even directly b...

AI Technical Summary

Problems solved by technology

However, in some extreme cases, such as the accumulation of particulate matter in the DPF, the diesel engine suddenly jumps to the idling condition during DPF regeneration, etc., this regeneration control method is due to the excessive oxidation and combustion of the particulate matter accumulated in the DPF during regeneration. It is easy to cause the internal temperature of the DPF to rise sharply, that is, "flying temperature", so that the maximum internal temperature and temperature gradient of the DPF are close to or even exceed the limit that the DPF can withstand when the DPF is regenerated, thereby reducing the reliability and durability of the DPF, and even directly causing the DPF in severe cases. damage to

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