Internal combustion engine particulate filter control system

Abstract

The invention provides a particulate filter control system for an internal combustion engine, which includes a particulate flow module, an oxygen flow module, a nitrogen dioxide flow module, an active regeneration module, a passive regeneration module, a trapping rate module, and a particulate accumulation module; the particulate flow module is used to calculate The particle flow into the particulate filter; the oxygen flow module is used to calculate the oxygen flow into the particulate filter; the nitrogen dioxide flow module is used to calculate the nitrogen dioxide flow into the particulate filter; the active regeneration module is used to calculate the active regeneration of the particulate filter Regeneration reaction rate; the passive regeneration module is used to calculate the passive regeneration reaction rate of the particle filter; the capture rate module determines the particle accumulation rate in the particle filter according to the particle flow rate and the regeneration reaction rate; the particle accumulation module determines the particle accumulation rate according to the particle accumulation rate integral Accumulation of particulates in the filter. The present invention enables accurate calculation of the particulate load in a particulate filter of an internal combustion engine without relying on pressure or differential pressure sensors.

Description

technical field [0001] The invention relates to the field of internal combustion engines, in particular to a diesel engine energy saving and emission reduction system. Background technique [0002] Solution 1: Chinese patent CN1304743C provides an engine exhaust gas cleaning component, and its control method includes a method for estimating the carbon load of the particulate filter. The technical means adopted by this patent and the effect achieved are: the engine control unit estimates the particulate accumulation of the particulate filter based on the difference between the upstream pressure and the downstream pressure of the particulate filter, and recommends using the exhaust gas flow rate adjustment obtained from the engine speed and load by looking up the chart Estimated particulate accumulation. The deficiency of this patent and the reason is that when only the differential pressure is used as a method for estimating the accumulation of particulates, the influence of...

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Problems solved by technology

[0006] 1. After the incomplete regeneration of the particulate filter, the particle distribution state is a non-uniform distribution state, and the corresponding relationship between pressure difference and accumulation amount is no longer the same as that of the uniform distribution state. If the distribution state is not considered to be corrected, the particle accumulation amount will occur Estimation error, which in turn affects the correct calculation of the regeneration timing of the particulate filter, and there is a risk of thermal runaway during regeneration of the particulate filter;

[0007] 2. When using the engine speed and fuel injection volume as the conditions for calculating particulate emissions, the influence of the cooling water temperature of the internal combustion engine on its particulate emissions during the actual operation of the internal combustion engine is not considered

[0008] 3. It does not consider that when the differential pressure sensor fails, the second method of calculating the accumulated amount of particulates or the second method has less correction amount and limited accuracy, and cannot provide accurate regeneration opportunities for the particulate filter

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