Diesel particulate filter regeneration method and system and engine

Abstract

The invention relates to the field of engines, in particular to a diesel particulate filter regeneration method and system and an engine. The diesel particulate filter regeneration method comprises the following steps of determining the mileage difference between the current driving mileage and the mileage corresponding to the last successful regeneration; and determining a regeneration strategy of a diesel particulate filter according to the mileage difference. According to the method, the regeneration strategy of the diesel particulate filter is determined according to the mileage difference, different regeneration strategies can ensure that a special-purpose vehicle can complete regeneration under different working conditions according to different working conditions of the special-purpose vehicle, and the accuracy of regeneration judgment opportunities is improved, so that the regeneration efficiency of the diesel particulate filter is improved, the burnout risk of the diesel particulate filter is reduced, the diagnosis difficulty of the diesel particulate filter is reduced, the unnecessary consumption of engine fuel is reduced, the fuel economy is improved, the aftertreatmentsafety is improved, the service life of the engine and aftertreatment is prolonged, and the reliability of the engine is improved.

Description

technical field [0001] The present application relates to the technical field of engines, in particular to a method, system and engine for regenerating a particle filter. Background technique [0002] A particulate filter (Diesel Particulate Filter, DPF) is a ceramic filter installed in the diesel engine exhaust system, such as figure 1 As shown, it can capture particulate emissions before they enter the atmosphere. A small part of engine exhaust gas enters the cylinder through the exhaust gas recirculation system (Exhaust Gas Recirculation, EGR) and air together with the throttle valve (Throttle Valve, TVA) and enters the cylinder for combustion. After that, a part of the exhaust gas passes through the HC nozzle, diesel oxidation catalyst (Diesel Oxidationcatalyst , DOC), particulate filter and selective catalytic reduction (SelectiveCatalyticReduction, SCR), discharged. As more and more particles are collected in the particulate filter, the exhaust back pressure will slo...

AI Technical Summary

Problems solved by technology

[0003] The carbon load of the particulate filter in a complex environment changes, and the carbon deposition rate of vehicles with different purposes is different, so the corresponding regeneration timing is also different, and the performance during regeneration is also different. For special-purpose vehicles, such as Garbage trucks, running at low speed and low load for a long time, are prone to the problem of driving regeneration failure

Long-term non-regeneration or incomplete regeneration caused by regeneration failure will reduce the life of the aftertreatment and reduce the reliability of the engine

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