CN110608081A

CN110608081A - Control method and control system for reducing DPF pressure difference

Info

Publication number: CN110608081A
Application number: CN201910910978.4A
Authority: CN
Inventors: 董光雷; 杨春艳; 翟长辉; 杨海龙; 黄国龙
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2019-12-24
Anticipated expiration: 2039-09-25
Also published as: CN110608081B

Abstract

The invention discloses a control method and a control system for reducing DPF pressure difference, the technical scheme of the invention is that after the DPF is used for the first time, before the periodic execution of standard active regeneration treatment, whether pretreatment conditions are met is judged based on the detected carbon deposition amount of the DPF, and when the pretreatment conditions are met, the pretreatment active regeneration treatment is carried out, at least all carbon smoke particles accumulated in DPF carrier pores of the DPF are oxidized and combusted into ash particles.

Description

Control method and control system for reducing DPF pressure difference

Technical Field

The invention relates to the technical field of exhaust aftertreatment of internal combustion engines, in particular to a control method and a control system for reducing DPF pressure difference.

Background

A Diesel Particulate Filter (DPF) is a necessary after-treatment device for Diesel engines to meet the requirements of emission regulations. The DPF collects Particulate matter (PM for short) in the exhaust gas of the diesel engine by means of physical filtration, and reduces the PM emission of the diesel engine.

With the upgrading of diesel engine emission technology, the DPF technology is adopted, most of PM particulate matters such as carbon smoke in tail gas can be filtered, the PM emission is effectively reduced, and the requirements of relevant emission regulations are met. However, as the running time of the engine increases, the soot accumulation weight in the DPF also increases, and as PM particles such as soot and the like accumulate in the DPF channel, the pressure difference of the DPF becomes larger and larger, which causes the exhaust back pressure to rise, affects the dynamic property and fuel economy of the engine, and even directly blocks the exhaust pipe in serious conditions, causing the engine to be damaged.

Therefore, when the DPF is used, after the soot accumulation weight reaches a certain amount, the DPF needs to be actively regenerated periodically, in the regeneration process, the engine injects Diesel oil through the cylinder or injects Diesel oil through the tail pipe, the Diesel oil is oxidized in a Diesel Oxidation Catalyst (DOC) to release heat, high temperature is generated, the soot is oxidized and combusted at high temperature, the flow resistance of the DPF is controlled in a reasonable range, the normal work of the engine and the DPF is ensured, and the function of the DPF is recovered. However, in existing DPF active regeneration control schemes, the differential pressure is still high and needs to be further reduced.

Disclosure of Invention

In view of this, the present application provides a control method and a control system for reducing DPF differential pressure, and the scheme is as follows:

a control method of reducing a DPF differential pressure, comprising:

detecting the carbon deposition amount of the DPF after the first use of the DPF is started;

judging whether the carbon deposition amount of the DPF meets a pretreatment condition;

if yes, performing pre-active regeneration treatment, and oxidizing and burning at least all soot particles accumulated in pores of a DPF carrier of the DPF into ash particles;

after the pre-active regeneration treatment is finished, periodically executing standard active regeneration treatment based on the carbon deposition amount of the DPF;

wherein the method of performing the standard active regeneration process comprises:

after the pre-active regeneration treatment is finished, continuously detecting the carbon deposition amount of the DPF;

judging whether the carbon deposition amount of the DPF meets a standard active regeneration condition or not;

if so, all soot particles accumulated by the DPF are oxidatively combusted into ash particles.

Preferably, in the control method, the method of detecting the soot amount of the DPF includes:

detecting a pressure differential across the DPF;

determining the soot amount of the DPF based on a relationship between the differential pressure and the soot amount.

Preferably, in the control method, the method of determining whether the preprocessing condition is satisfied includes:

after the first use of the DPF is started, if the soot amount of the DPF reaches a first threshold value for the first time, the pre-treatment condition is met, and the first threshold value is smaller than the soot amount of the DPF when the standard active regeneration treatment is executed.

Preferably, in the control method, the method of determining whether the standard active regeneration condition is satisfied includes:

and after the pre-active regeneration treatment is finished, if the carbon deposition amount reaches a second threshold value, the pre-treatment condition is met, and the second threshold value is larger than the carbon deposition amount when the pre-active regeneration treatment is executed by the DFP.

Preferably, in the above control method, if the pre-treatment condition is satisfied, a DPF carrier gap of the DPF is completely filled with soot particles and a front surface of the DPF is accumulated with a layer of soot particles.

Preferably, in the above control method, all soot particles accumulated in the DPF are oxidatively combusted into ash particles when the pre-active regeneration process is performed.

The present invention also provides a control system for reducing DPF differential pressure, comprising:

DPF；

a collecting device for collecting a differential pressure of the DPF;

an active regeneration device for performing an active regeneration process on the DPF;

a controller for determining a soot amount of the DPF based on the pressure differential;

after the DPF is used for the first time, the controller is used for judging whether the carbon deposition amount of the DPF meets a pretreatment condition, if so, the active regeneration equipment is controlled to carry out a pre-active regeneration treatment, at least all carbon soot particles accumulated in pores of a DPF carrier of the DPF are oxidized and combusted into ash particles, after the pre-active regeneration treatment is finished, the carbon deposition amount of the DPF is continuously detected, and the active regeneration equipment is periodically controlled to carry out a standard active regeneration treatment based on the carbon deposition amount of the DPF; the method for the controller to execute the standard active regeneration process comprises the following steps: judging whether the carbon deposition amount of the DPF meets a standard active regeneration condition or not; if so, all soot particles accumulated by the DPF are oxidatively combusted into ash particles.

Preferably, in the control system, the collecting means is a gas pressure sensor for detecting a pressure difference between the front surface and the rear surface of the DPF;

the controller is configured to determine a soot amount of the DPF based on a relationship between the pressure difference and the soot amount.

Preferably, in the above control system, the method for the controller to determine whether the preprocessing condition is satisfied includes:

Preferably, in the above control system, the method for the controller to determine whether the standard active regeneration condition is satisfied includes:

and after the pre-active regeneration treatment is finished, if the carbon deposition amount of the DPF reaches a second threshold value, the pre-treatment condition is met, and the second threshold value is larger than the carbon deposition amount when the pre-active regeneration treatment is executed by the DFP.

As can be seen from the above description, in the control method and the control system for reducing the DPF differential pressure according to the technical solution of the present invention, after the DPF is used for the first time and before the DPF is periodically subjected to the standard active regeneration, whether the pre-treatment condition is satisfied is determined based on the detected soot amount of the DPF, and when the pre-treatment condition is satisfied, the pre-active regeneration treatment is performed to oxidize and burn at least all soot particles accumulated in the pores of the DPF carrier of the DPF into ash particles.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of loading soot particles in a DPF provided by an implementation of the present invention;

FIG. 2 is a schematic illustration of DPF carrier internal pores filled with ash particles after active regeneration of a DPF in accordance with an embodiment of the present invention;

FIG. 3 is a graph of DPF pressure differential during different soot deposition processes provided by an embodiment of the present invention;

FIG. 4 is a schematic flow chart illustrating a control method for reducing DPF pressure differential according to an embodiment of the present invention;

FIG. 5 is a flowchart illustrating a method for performing a standard active regeneration process according to an embodiment of the present invention;

FIG. 6 is a schematic flowchart of a method for detecting soot amount of the DPF according to an embodiment of the present invention;

FIG. 7 is a flowchart of a method for determining whether a pre-processing condition is satisfied according to an embodiment of the present invention;

FIG. 8 is a flowchart of a method for determining whether a standard active regeneration condition is satisfied according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a control system for reducing DPF pressure difference according to an embodiment of the present invention.

Detailed Description

The embodiments of the present application will be described in detail and fully with reference to the accompanying drawings, wherein the description is only for the purpose of illustrating the embodiments of the present application and is not intended to limit the scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic diagram of loading soot particles in a DPF provided by an embodiment of the present invention, the DPF has a plurality of DPF carriers, during use, the soot particles 12 are filled in pores inside the DPF carriers 11, and a filter layer 13 formed by a layer of dense soot particles 12 is accumulated on a front surface of the DPF carriers, so that although the filtering efficiency of the DPF can be improved, the pressure difference of the DPF is gradually increased.

The inventor researches and discovers that as shown in fig. 2, fig. 2 is a schematic diagram of loading ash particles in the internal pores of a DPF carrier after the DPF is subjected to active regeneration, if the DPF triggers the active regeneration under a certain accumulation amount of the soot particles 12, the ash particles 14 formed or remained after the soot particles 12 are subjected to the active regeneration treatment are loaded in the pores of the DP carrier 11, and the ash particles 14 are loose and have a low density compared with the soot particles 12, so that the permeability is better, and then the soot particles 12 are captured, so that the pressure difference of the DPF can be effectively reduced.

As shown in fig. 3, fig. 3 is a graph of the DPF differential pressure in different soot deposition processes provided by the embodiment of the present invention, if the DPF differential pressure is rapidly increased along with the accumulation of soot deposition time according to the normal soot deposition process, the DPF differential pressure may be significantly reduced for the soot deposition process after the active regeneration optimization is triggered according to the embodiment of the present invention.

However, when the passive regeneration is effective, it is difficult to perform the active regeneration in a short time, and the soot particles 12 in the DFP carriers 11 are difficult to remove. And the conventional technology is generally to trigger a standard active regeneration treatment after the soot amount of the DPF meets the standard active regeneration condition, and the soot amount at this time is already large, so the DPF can not completely remove the soot particles 12 in the DFP carrier 11 when performing the first active regeneration, and because the first active regeneration can not completely remove the soot particles 12 in the DFP carrier 11, as the active regeneration treatment process performed periodically is performed, ash particles are accumulated on the front surface of the DFP in the continuous active regeneration process, the soot particles 12 remaining in the DFP carrier 11 in the first active regeneration process are more difficult to remove, and the soot particles 12 in the DFP carrier 11 can cause a larger pressure difference of the DPF.

In order to solve the above problems, embodiments of the present invention provide a control method and a control system for reducing a pressure difference of a DPF, which can reduce a pressure difference generated in a soot deposition process of the DPF, and implement a simple process of a scheme without changing an existing hardware structure of an engine, and can implement a purpose of optimizing the pressure difference of the DPF only by optimizing on a control logic.

Specifically, at the initial stage of the DPF, when the DPF is used for the first time, the pre-active regeneration treatment is performed under the condition of a small carbon loading amount, and the carbon deposition amount during the pre-active regeneration treatment is smaller than that during the periodically executed standard active regeneration treatment, so that after the pre-active regeneration treatment can be ensured, all the carbon soot particles 12 accumulated in the pores of the DPF carrier 11 of the DPF can be oxidized and combusted into the ash particles 14, so that the ash particles 14 are completely attached and filled in the pores inside the DPF carrier 11, the purpose of reducing the pressure difference of the DPF is achieved, and the influence degree of the exhaust back pressure rise on the performance of the engine is further reduced. Because the internal pores of the DPF carrier 11 are completely oxidized and burnt into the ash particles 14 through the pre-active regeneration treatment before the standard active regeneration treatment is periodically executed, the soot particles 12 accumulated on the front surface of the DPF can be ensured to be completely oxidized and burnt into the ash particles 14 every period above the front surface of the DPF when the standard active regeneration treatment is sequentially carried out on the soot particles 12 accumulated on the front surface of the DPF subsequently.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 4, fig. 4 is a schematic flowchart of a control method for reducing a DPF differential pressure according to an embodiment of the present invention, where the control method includes:

step S11: the soot amount of the DPF is detected after the first use of the DPF is started.

Step S12: and judging whether the carbon deposition amount of the DPF meets the pretreatment condition.

Step S13: if so, a pre-active regeneration treatment is performed to oxidize and burn at least all soot particles 12 accumulated in the DPF carrier pores of the DPF to ash particles 14.

If the pretreatment condition is not met, returning to the step S11, and continuously detecting the carbon deposition amount of the DPF until whether the carbon deposition amount of the DPF meets the pretreatment condition or not.

Step S14: after the pre-active regeneration treatment is completed, a standard active regeneration treatment is periodically executed based on the carbon deposition amount of the DPF.

In step S14, the method for executing the standard active regeneration processing is shown in fig. 5, where fig. 5 is a schematic flow chart of a method for executing the standard active regeneration processing according to an embodiment of the present invention, and the method includes:

step S21: and after the pre-active regeneration treatment is finished, continuously detecting the carbon deposition amount of the DPF.

Step S22: and judging whether the carbon deposition amount of the DPF meets the standard active regeneration condition.

Step S23: if so, all soot particulates 12 accumulated by the DPF are oxidatively combusted into ash particulates 14.

If not, returning to the step S21, and continuously detecting the soot amount of the DPF until whether the soot amount of the DPF meets the standard active regeneration condition or not.

In the control method according to the embodiment of the present invention, a method for detecting a soot amount of the DPF is shown in fig. 6, where fig. 6 is a schematic flow diagram of the method for detecting a soot amount of the DPF according to the embodiment of the present invention, and the method includes:

step S31: detecting a pressure differential of the DPF.

Step S32: determining the soot amount of the DPF based on a relationship between the differential pressure and the soot amount.

The soot amount of the DPF has a corresponding relationship with the pressure difference thereof, and the corresponding relationship can be obtained based on experimental tests, for example, the pressure difference corresponding to each of a plurality of groups of different soot amounts is tested, and then a functional relationship between the soot amount of the DPF and the pressure difference is obtained based on linear fitting, wherein the functional relationship is that the soot amount of the DPF has a corresponding relationship with the pressure difference thereof. Therefore, in the control method, based on the predetermined corresponding relation, after the DPF pressure difference is obtained through detection, the corresponding carbon deposition amount under the current DPF pressure difference can be obtained.

In the control method according to the embodiment of the present invention, the method for determining whether the preprocessing condition is satisfied includes: after the first use of the DPF is started, if the soot amount of the DPF reaches a first threshold value for the first time, the pre-treatment condition is met, and the first threshold value is smaller than the soot amount of the DPF when the standard active regeneration treatment is executed. Specifically, fig. 7 shows a method for determining whether the preprocessing condition is satisfied, where fig. 7 is a flowchart of a method for determining whether the preprocessing condition is satisfied according to an embodiment of the present invention, and the method includes:

step S41: and acquiring the carbon deposition amount of the current DPF.

Step S42: and judging whether the carbon deposition amount of the DPF reaches a first threshold value for the first time.

Step S43: if yes, the pretreatment condition is satisfied.

If not, the preprocessing condition is not satisfied, and the step S41 is returned to until the preprocessing condition is satisfied.

Wherein the first threshold is less than an amount of soot when the DPF performs the standard active regeneration process.

As shown in fig. 1, after the DPF is used for the first time, during the operation of the engine, the pores of the DPF carrier 11 are slowly filled with the soot particles 12, and when a certain amount of carbon loading is reached, the pores of the DPF carrier 11 are filled, and then the soot particles 12 are accumulated on the front surface of the DPF.

In the control method according to the embodiment of the present invention, the pre-active regeneration process is triggered by a smaller threshold (first threshold), and the standard active regeneration process is triggered by a larger threshold (second threshold). By means of the method shown in fig. 7, before the standard active regeneration process is periodically performed, the pre-active regeneration process is triggered by a smaller threshold (first threshold), so that all the soot particles 12 in the pores of the DPF carrier 11 can be completely combusted and oxidized into the ash particles 14, that is, the pre-active regeneration process is triggered when the DPF reaches a smaller carbon loading amount (first threshold) for the first time, and after the pre-active regeneration process is completed, the pores of the DPF carrier 11 are completely filled with the ash particles 14, so that the DPF differential pressure can be reduced.

Different first and second thresholds may be used for different engine types, and it is obvious that the first and second thresholds may be set by those skilled in the art based on requirements, and the embodiment of the present invention does not specifically limit this parameter. And if the carbon carrying amount of the DPF does not reach the smaller carbon carrying amount for optimizing the pressure difference after the first use of the DPF is started, continuing to carry out carbon deposition, and detecting the carbon deposition of the DPF until the carbon deposition meets the preset pre-active treatment condition.

And when the DPF finishes the pre-active regeneration treatment under the condition of the small carbon loading amount, subsequently executing a periodic standard active regeneration treatment process based on the carbon deposition amount of the DPF.

In the control method according to the embodiment of the present invention, the method for determining whether the standard active regeneration condition is satisfied includes: and after the pre-active regeneration treatment is finished, if the carbon deposition amount reaches a second threshold value, the standard active regeneration condition is met, and the second threshold value is larger than the carbon deposition amount when the pre-active regeneration is executed by the DFP. Specifically, fig. 8 shows a method for determining whether the standard active regeneration condition is satisfied, where fig. 8 is a flowchart of a method for determining whether the standard active regeneration condition is satisfied according to an embodiment of the present invention, and the method includes:

step S51: and after the pre-active regeneration treatment is finished, acquiring the carbon deposition amount of the current DPF.

Step S52: and judging whether the carbon deposition amount of the DPF reaches a second threshold value.

Step S53: if so, the standard active regeneration condition is satisfied.

If not, the standard active regeneration condition is not satisfied, and the step S51 is returned until the standard active regeneration condition is satisfied.

Wherein the second threshold is greater than an amount of soot deposited when the DFP performs the pre-active regeneration process.

In the control method according to the embodiment of the present invention, if the pretreatment condition is satisfied, the clearance of the DPF carrier 11 of the DPF is completely filled with the soot particles 12, and a layer of soot particles 12 is accumulated on the front surface of the DPF, and the total soot amount of the DPF is smaller than the soot amount of the DPF when the standard active regeneration process is performed.

In the control method according to the embodiment of the present invention, when the pre-active regeneration process is performed, all soot particles 12 accumulated in the DPF are oxidized and burned into ash particles 14. That is, when the pre-active regeneration process is performed, all the soot particles 12 in the pores of the DPF carrier 11 and the soot particles 12 on the front surface thereof are oxidized and burned into ash particles 14.

As can be seen from the above description, in the control method provided in the embodiment of the present invention, in the initial stage of the DPF, when the DPF is used for the first time, the pre-active regeneration treatment is performed with a smaller carbon loading amount, and the amount of the carbon deposition during the pre-active regeneration is smaller than the amount of the carbon deposition during the standard active regeneration treatment that is periodically performed, so that it can be ensured that at least all the carbon deposition particles 12 accumulated in the pores of the DPF carrier 11 of the DPF are oxidized and burned into the ash particles 14, so that the ash particles 14 are completely deposited and filled in the pores of the DPF carrier 11, and the purpose of reducing the pressure difference of the DPF is achieved, thereby reducing the influence degree of the increase of the exhaust back pressure on the engine. Because the soot particles 12 in the pores inside the DPF carrier 11 are completely oxidized and burned into the ash particles 14 through the pre-active regeneration treatment before the standard active regeneration treatment is periodically performed, the soot particles 12 accumulated in each period above the front surface of the DPF can be ensured to be completely oxidized and burned into the ash particles 14 when the standard active regeneration treatment is sequentially performed on the soot particles 12 accumulated on the front surface of the DPF.

Based on the above control method embodiment, another embodiment of the present invention further provides a control system for reducing DPF differential pressure, where the control system may be configured to execute the control method, and the control system is shown in fig. 9, where fig. 9 is a schematic structural diagram of the control system for reducing DPF differential pressure provided by the embodiment of the present invention, and includes:

a DPF21, the structure of which can be seen in FIGS. 1 and 2;

an acquisition device 22, wherein the acquisition device 22 is used for acquiring parameter information of the DPF 21;

an active regeneration device 23, said active regeneration device 23 for performing an active regeneration process on said DPF 21;

a controller 24, the controller 24 for determining the soot amount of the DPF21 based on the pressure differential;

after the DPF21 is first used, the controller 24 is configured to determine whether the soot amount of the DPF21 meets a pre-treatment condition, if so, control the active regeneration device 23 to perform a pre-active regeneration treatment, oxidize and burn at least all soot particles 12 accumulated in pores of the DPF carrier 11 of the DPF21 into ash particles 14, after the pre-active regeneration treatment is completed, continue to detect the soot amount of the DPF21, and periodically control the active regeneration device 23 to perform a standard active regeneration treatment based on the soot amount of the DPF 21; the method by which the controller 24 executes the standard active regeneration process includes: judging whether the soot amount of the DPF21 meets a standard active regeneration condition; if so, all of the soot particulates 12 accumulated by the DPF21 are oxidatively combusted into ash particulates 14.

In the control system according to the embodiment of the present invention, the collecting device 22 is a gas pressure sensor for detecting a pressure difference of the DPF21, and is configured to detect a gas pressure difference between a front surface and a rear surface of the DPF; the controller 24 is configured to determine the soot amount of the DPF21 based on the relationship between the pressure differential and the soot amount.

In the control system according to the embodiment of the present invention, the method for the controller 24 to determine whether the preprocessing condition is satisfied includes:

after the first use of the DPF21 begins, the pre-treatment condition is met if the soot amount of the DPF21 first reaches a first threshold value, which is less than the soot amount of the DPF21 when the standard active regeneration process is performed.

In the control system according to the embodiment of the present invention, the method for the controller 24 to determine whether the standard active regeneration condition is satisfied includes:

after the pre-active regeneration treatment is completed, if the soot amount of the DPF21 reaches a second threshold value, the pre-treatment condition is satisfied, and the second threshold value is greater than the soot amount when the pre-active regeneration treatment is performed by the DFP 21.

The control system of the embodiment of the invention can execute the control method to carry out active regeneration management on the DPF21, and can effectively reduce the pressure difference of the DPF 21.

The embodiments in the present description are described in a progressive manner, or in a parallel manner, or in a combination of a progressive manner and a parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. For the control system disclosed by the embodiment, the control method disclosed by the embodiment corresponds to the control system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for reducing a pressure differential across a DPF, comprising:

2. The control method according to claim 1, wherein the method of detecting the soot amount of the DPF includes:

detecting a pressure differential across the DPF;

3. The control method according to claim 1, wherein the method of determining whether the preprocessing condition is satisfied includes:

4. The control method according to claim 1, wherein the method of determining whether the standard active regeneration condition is satisfied comprises:

and after the pre-active regeneration treatment is finished, if the carbon deposition amount reaches a second threshold value, the standard active regeneration condition is met, and the second threshold value is larger than the carbon deposition amount when the pre-active regeneration treatment is executed by the DFP.

5. The control method as set forth in claim 1, wherein if the pre-treatment condition is satisfied, a DPF carrier gap of the DPF is completely filled with soot particles, and a front surface of the DPF is accumulated with a layer of soot particles, and a total soot amount of the DPF is currently smaller than that when the DPF performs the standard active regeneration treatment.

6. The control method according to any one of claims 1 to 5, wherein the pre-active regeneration process is performed to oxidize and burn all soot particles accumulated in the DPF into ash particles.

7. A control system for reducing a pressure differential across a DPF, comprising:

DPF；

a collecting device for collecting a differential pressure of the DPF;

8. The control system of claim 7, wherein the collecting means is a gas pressure sensor for detecting the DPF differential pressure for detecting a gas pressure difference of the front and rear surfaces of the DPF;

9. The control system of claim 7, wherein the method by which the controller determines whether the pre-processing condition is satisfied comprises:

10. The control system of claim 7, wherein the method by which the controller determines whether the standard active regeneration condition is met comprises: