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A method for judging the timing of dpf regeneration of diesel engine based on carbon load

A technology of regeneration timing and DPF, applied to machines/engines, mechanical equipment, engine components, etc., to achieve reliable estimation results and improve fuel economy

Active Publication Date: 2020-08-28
JIANGSU UNIV
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  • Abstract
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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the present invention provides a method for judging the timing of DPF regeneration of diesel engines based on carbon load, which makes up for the shortcomings of the traditional single use of differential pressure sensors for carbon load estimation

Method used

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  • A method for judging the timing of dpf regeneration of diesel engine based on carbon load
  • A method for judging the timing of dpf regeneration of diesel engine based on carbon load
  • A method for judging the timing of dpf regeneration of diesel engine based on carbon load

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0060] Such as figure 1 and figure 2 Shown, the judging method of the diesel engine DPF regeneration opportunity based on carbon load of the present invention, comprises the steps:

[0061] Calculate the model-based soot storage mass M 1 , including the following steps:

[0062] Calculation and correction of the soot mass flow rate M of the original machine 11 ,Such as image 3 shown, including the following steps:

[0063] Query the soot emission MAP map of the original engine according to the engine speed and torque, and obtain the corresponding soot mass flow rate M of the original engine 10 ;

[0064] Query the EGR correction MAP according to the engine speed and torque to obtain the correction amount K of the EGR rate to soot 1 ;

[0065] Query the air-fuel...

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Abstract

The invention provides a method for judging diesel engine DPF regeneration timing based on carbon loads. The method comprises the following steps: calculating the model-based carbon smoke storage massM1; calculating the flow-resistance-based carbon smoke mass M2; choosing between the M1 and the M2 according to the operating condition of an engine, so as to obtain the final carbon smoke mass M; and judging whether an oil injector needs to be started or not according to the final carbon smoke mass M and the regeneration threshold value. Specifically, the corrected original engine carbon smoke mass flow rate M11 is calculated; the carbon smoke mass flow rate M12 which is consumed by the active regeneration reaction inside a DPF is calculated; the carbon smoke mass flow rate M13 which is consumed by the passive regeneration reaction inside the DPF is calculated; and an original engine carbon smoke emission MAP graph is queried according to the rotating speed and the torque of the engine,and then the corresponding original engine carbon smoke mass flow rate M10 is obtained. By the adoption of the method provided by the invention, the defect about the traditional and single use of a differential pressure sensor for the estimation of the carbon loads can be overcome.

Description

technical field [0001] The invention relates to the field of particle trapping and regeneration of DPF in a diesel engine aftertreatment system, in particular to a method for judging the timing of DPF regeneration of a diesel engine based on carbon load. Background technique [0002] Environmental protection regulations put forward strict requirements on the particle size and quantity of the particulate matter in the exhaust gas. In order to reduce the particulate matter in the exhaust gas, it is necessary to introduce the particle catcher DPF technology into the after-treatment system. Diesel particulate filter DPF has high purification efficiency and is currently the most effective particle purification technology and one of the most widely used after-treatment technologies. The working cycle of the DPF includes the filtration stage and the regeneration stage. During the filtration stage, the particles are intercepted by the inner wall of the carrier and then settle inside...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00
CPCF01N9/002F01N9/005Y02T10/40
Inventor 刘军马成功
Owner JIANGSU UNIV
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