KR102417343B1 - Exhaust gas post processing system and control method thereof - Google Patents

Abstract

The present invention relates to an exhaust gas after-treatment system, and more particularly, to an exhaust gas after-treatment system capable of preventing exposure of a gasoline filtration filter to high temperature and a control method thereof.
To this end, the exhaust gas post-treatment system according to an embodiment of the present invention includes a data detector for detecting driving state data of a vehicle, a gasoline filtration filter for collecting particulate matter included in exhaust gas discharged from an engine, and the data detector Check the driving state data and the basic suit amount limit value detected in Includes a controller to control.

Description

Exhaust gas post-treatment system and control method thereof

The present invention relates to an exhaust gas after-treatment system, and more particularly, to an exhaust gas after-treatment system capable of preventing exposure of a gasoline filtration filter to high temperature and a control method thereof.

In general, in order to improve fuel efficiency and performance in an internal combustion engine, gasoline direct injection (GDI) technology is being developed. The engine to which the gasoline direct injection is applied refers to an injection method in a gasoline engine in which fuel is directly injected into a combustion chamber without injecting fuel into an intake pipe.

This makes the air-fuel ratio around the spark plug rich, so that the engine can be operated even at a lean air-fuel ratio. Due to the development of gasoline direct injection technology, the generation of particulate matter (PM) is a problem as the incomplete combustion section in the combustion chamber increases.

In particular, in recent years, particulate matter has been reported in various media as the most important cause of great harm to the human body and pollution of the air.

As a means of reducing such particulate matter, a gasoline particulate matter filter (Gasoline Particulate Filter: GPF) is installed in the exhaust system of a gasoline vehicle. The gasoline filtration filter raises the temperature above the ignition temperature and raises the temperature above the ignition temperature when the amount of soot, which is the soot collected inside, after time elapses as the contaminants in the engine exhaust gas pass through the carrier. will remove

Pollutants in engine exhaust gas are generated such as soot, which does not burn out at a certain temperature or higher. These pollutants are ash, which is a metal oxide component generated from vehicle lubricating oil and metal components of engine cylinder liners. Since this ash is a metal oxide, it is a material that cannot be removed by oxidation reaction with oxygen and nitrogen.

That is, as the driving distance of the vehicle increases, the amount of ash collected in the gasoline filtration filter increases. The soot collecting space of the gasoline filtration filter is narrowed by such ash, and when soot is accumulated in the narrow space, the relative soot density increases, and the gasoline filtration filter is exposed to high temperature during soot regeneration.

Accordingly, in the conventional case, when the amount of ash increases, the gasoline filtration filter may be damaged by exposure to high temperature during soot regeneration.

Matters described in this background section are prepared to improve understanding of the background of the invention, and may include matters that are not already known to those of ordinary skill in the art to which this technology belongs.

An embodiment of the present invention provides an exhaust gas post-treatment system capable of adjusting the limit value of the amount of soot according to the amount of ash collected, and a method for controlling the same.

In addition, an embodiment of the present invention provides an exhaust gas post-treatment system capable of adjusting a suit amount limit value according to driving state data of a vehicle, and a control method thereof.

In one embodiment of the present invention, a data detector for detecting driving state data of the vehicle; Gasoline filtration filter for collecting particulate matter contained in the exhaust gas discharged from the engine; and checking the driving state data and the basic suit quantity limit value detected by the data detector, correcting the basic suit quantity limit value according to the driving state data to generate a corrected suit quantity limit value, and based on the corrected suit quantity limit value An exhaust gas aftertreatment system comprising a controller for controlling a gasoline filtration filter may be provided.

In addition, the controller checks the driving distance of the driving state data, and when the driving distance exceeds a first reference distance, generates a first corrected suit quantity limit value using the basic suit quantity limit value and the first correction value, When the driving distance exceeds the second reference distance, a second corrected suit amount limit value may be generated by using the basic suit amount limit value and the second correction value.

Also, the second reference distance may be greater than the first reference distance.

Also, the first correction value and the second correction value may be constant values of 1 or less, and the first correction value may be greater than the second correction value.

In addition, the controller checks the fuel consumption of the driving state data, and when the fuel consumption exceeds a first reference consumption amount, generates a first corrected soot quantity limit value by using the basic soot quantity limit value and the first correction value, When the fuel consumption exceeds the second reference consumption amount, the basic soot amount limit value and the second correction value may be used to generate a second corrected soot amount limit value.

In addition, the controller checks the engine-on time of the driving state data, and when the engine-on time exceeds a first reference time, the controller generates a first corrected soot quantity limit value using the basic soot quantity limit value and the first correction value and, when the engine-on time exceeds the second reference time, the second corrected soot quantity limit value may be generated by using the basic soot quantity limit value and the second correction value.

And in another embodiment of the present invention, the step of checking the driving state data of the vehicle and a preset basic suit amount limit value; generating a corrected suit amount limit value by using the basic suit amount limit value and the correction value according to the driving state data; and controlling the gasoline filtration filter based on the limit value of the amount of soot.

The embodiment of the present invention can adjust the limit value of the amount of soot according to the amount of ash collected, so that the regeneration cycle of the gasoline filtration filter can be shortened.

In addition, since the suit amount limit value can be adjusted according to the driving state data of the vehicle, it is possible to prevent damage to the gasoline filtration filter by preventing high temperature exposure.

In addition, the effects obtainable or predicted by the embodiments of the present invention are to be disclosed directly or implicitly in the detailed description of the embodiments of the present invention. That is, various effects predicted according to an embodiment of the present invention will be disclosed in the detailed description to be described later.

1 is a block diagram showing an exhaust gas post-treatment system according to an embodiment of the present invention.
2 is a flowchart illustrating a method for controlling exhaust gas post-treatment according to a first embodiment of the present invention.
3 is a graph illustrating a suit quantity limit value for a driving distance according to the first embodiment of the present invention.
4 is a flowchart illustrating a method for controlling exhaust gas post-treatment according to a second embodiment of the present invention.
5 is a flowchart illustrating a method for controlling exhaust gas post-treatment according to a third embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings and description, the operating principle of the exhaust gas post-treatment system and its control method according to an embodiment of the present invention will be described in detail. However, the drawings shown below and the detailed description given below relate to one preferred embodiment among various embodiments for effectively explaining the features of the present invention. Accordingly, embodiments of the present invention should not be limited only to the following drawings and description.

In addition, when it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention in describing embodiments of the present invention, the detailed description thereof will be omitted. And the terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

In addition, in the following embodiments, terms will be appropriately modified, integrated, or separated so that those of ordinary skill in the art can clearly understand the key technical features of the present invention. , the present invention is by no means limited.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an exhaust gas post-treatment system according to an embodiment of the present invention.

Referring to Figure 1, the exhaust gas post-treatment system according to an embodiment of the present invention is an engine 100, an exhaust pipe 120, a gasoline filtration filter (Gasoline Particulate Filter: hereinafter referred to as "GPF", 130), It includes a differential pressure sensor 150 , a data detector 160 , and a controller 170 .

The output of the engine 100 is controlled by the control of the controller 170 , and driving is controlled to an optimal operating point according to the control of the controller 170 .

The engine 100 converts chemical energy into mechanical energy by burning fuel and air. That is, the engine 100 is connected to the intake manifold 103 to receive air into the combustion chamber 105 . At this time, the injector 109 is mounted in the combustion chamber 105 to inject into the combustion chamber 105 .

The exhaust gas connected to the exhaust manifold 107 and generated in the combustion process is collected in the exhaust manifold 107 and then discharged to the outside of the vehicle. The exhaust gas includes particulate matter (PM), and the particulate matter includes soot, solvent organic fraction (SOF) and carbon particles (carbon or soot).

The engine 100 may be a gasoline direct injection (GDI) engine.

The exhaust pipe 120 is connected to the exhaust manifold 107 to discharge exhaust gas to the outside of the vehicle. The GPF 130 is mounted on the exhaust pipe 120 to remove particulate matter included in the exhaust gas.

The GPF 130 is mounted on the exhaust pipe 120 and is a filter for filtering particulate matter included in the exhaust gas.

Most of the particulate matter is hydrocarbons called soot, which occurs when the fuel does not burn properly. Accordingly, the GPF 130 collects particulate matter including soot by using a catalyst filter.

The catalyst is formed in the shape of a honeycomb, and a special coating is applied to adsorb particulate matter.

The GPF 130 collects and filters the soot contained in the exhaust gas discharged from the engine 100 , and automatically according to the amount of soot collected, the mileage of the vehicle, the time, or the differential pressure detected through the differential pressure sensor 150 . going through the process of regeneration. This regeneration process is a process in which fuel is injected into the exhaust gas of high temperature in the exhaust stroke of the engine 100 to generate additional combustion and further rise, thereby activating the catalyst, and oxidizing the remaining particulate matter into ashes.

Also, the GPF 130 may actively perform a regeneration process under the control of the controller 170 .

The differential pressure sensor 150 measures the pressure difference between both ends of the GPF 130 . That is, the differential pressure sensor 150 is disposed at the front end 153 and the rear end 155 of the GPF 130 , the pressure of the exhaust gas entering the GPF 130 and the pressure of the exhaust gas passing through the GPF 130 . and measure the differential pressure, which is the pressure difference between the two ends.

The differential pressure sensor 150 provides the measured differential pressure to the controller 170 . That is, the more soot is collected in the catalyst inside the GPF 130, the air clouding is blocked and the differential pressure across the GPF 130 increases. The differential pressure sensor 150 measures this and provides it to the controller 170.

The data detector 160 detects driving state data for controlling the GPF 130 . That is, the data detector 160 detects driving state data including the driving distance, fuel consumption, and engine on time. In this case, the mileage may indicate a distance traveled by the vehicle for a predetermined time, the fuel consumption may indicate an amount of fuel consumed by the vehicle for a predetermined time, and the engine on time may indicate the time the engine 100 is turned on. Here, the predetermined time may be different according to the control of the controller 170 .

The data detector 160 may periodically detect driving state data according to the control of the controller 170 or may detect driving state data aperiodically according to the control of the controller 170 .

The data detector 160 provides the detected driving state data to the controller 170 .

The controller 170 controls the components of the exhaust gas aftertreatment system. That is, the controller 170 controls the engine 100 , the GPF 130 , the differential pressure sensor 150 , and the data detector 160 .

In other words, the controller 170 checks the driving state data from the data detector 160 . The controller 170 confirms a basic soot mass limit (SML). In this case, the basic suit amount limit value is a preset value for controlling the GPF 130 , and may be set through a preset algorithm (eg, a program and a probability model) or set by an operator.

The controller 170 corrects the basic suit amount limit value according to the driving state data to generate a corrected suit amount limit value.

The controller 170 controls the GPF 130 based on the correction suit amount limit value. That is, the controller 170 confirms that the ash in the GPF 130 is increased through the driving state data, checks the amount of soot collected in the GPF 130 through the differential pressure detected by the differential pressure sensor 150, and The GPF 130 is controlled to filter the soot before the amount of soot reaches the corrected soot amount limit.

The controller 170 may be implemented with one or more microprocessors operating according to a set program, and the set program is a sequence for performing each step included in the exhaust gas post-treatment control method according to an embodiment of the present invention to be described later. It can be done by including the command of This exhaust gas post-treatment control method will be described in more detail with reference to FIGS. 2 to 5 .

Hereinafter, an exhaust gas post-treatment control method will be described in detail with reference to FIGS. 2 to 5 .

2 is a flowchart illustrating a method for controlling exhaust gas post-treatment according to a first embodiment of the present invention.

Referring to FIG. 2 , the controller 170 checks the driving distance of the driving state data ( S210 ). In other words, the data detector 160 detects the driving distance traveled by the vehicle and provides the detected driving distance to the controller 170 . The controller 170 checks the driving distance detected by the data detector 160 . The reason for checking the mileage in this way is to check the amount of ash in the GPF 130 because the mileage is proportional to the amount of ash in the GPF 130 .

And the controller 170 checks the basic suit amount limit value. In this case, the basic suit amount limit value may be a value preset in the vehicle. For example, as shown in FIG. 3 , the basic soot amount limit value S may be 2 g/L.

The controller 170 determines whether the driving distance exceeds a first reference distance (S220). In this case, the first reference distance may be preset as a reference value in order to correct the basic suit amount limit value. The first reference distance may be set through a predetermined algorithm (eg, a program and a probabilistic model) or may be set by an operator. For example, as shown in FIG. 3 , the first reference distance may be indicated by reference number 310 .

When the driving distance exceeds the first reference distance, the controller 170 generates a first corrected suit amount limit value by using the basic suit amount limit value and the first correction value ( S230 ). In other words, when the driving distance exceeds the first reference distance, the controller 170 multiplies the basic suit amount limit value and the first correction value to generate a first corrected suit amount limit value. For example, as shown in FIG. 3 , the controller 170 multiplies the basic soot quantity limit value S and the first correction value α to generate a first corrected soot quantity limit value of 1.8 g/L. have.

In this case, the first correction value is a value set to correct the basic suit amount limit value, and may be a constant value of 1 or less. The first correction value is a preset value, and may be set through a preset algorithm (eg, a program and a probabilistic model) or set by an operator.

The controller 170 determines whether the driving distance exceeds a second reference distance ( S240 ). That is, the controller 170 receives and checks the driving distance from the data detector 160 , and determines whether the driving distance exceeds the second reference distance.

In this case, the second reference distance is a value for correcting the basic suit amount limit value, and may be greater than the first reference distance. The second reference distance is a preset value, and may be set through a preset algorithm (eg, a program and a probabilistic model) or may be set by an operator. For example, as shown in FIG. 3 , the second reference distance may be indicated by reference number 320 .

Meanwhile, if the driving distance is equal to or less than the second reference distance, the controller 170 returns to step S240 to monitor whether the driving distance exceeds the second reference distance.

When the driving distance exceeds the second reference distance, the controller 170 generates a second corrected suit amount limit value by using the basic suit amount limit value and the second correction value ( S250 ). That is, when the driving distance exceeds the second distance, the controller 170 multiplies the basic suit amount limit value and the second correction value to generate a second corrected suit amount limit value. For example, as shown in FIG. 3 , the controller 170 multiplies the basic soot amount limit value S and the second correction value β to generate a second corrected soot amount limit value of 1.6 g/L. have.

Here, the second correction value is a value set to correct the basic suit amount limit value, and may be a constant value of 1 or less. The second correction value may be smaller than the first correction value. The second correction value is a preset value and may be set through a preset algorithm (eg, a program and a probabilistic model) or may be set by an operator.

Meanwhile, if the driving distance does not exceed the first reference distance, the controller 170 generates a basic suit amount limit value as a corrected suit amount limit value ( S260 ).

The controller 170 controls the GPF 130 by using the corrected soot amount limit value (S270). That is, the controller 170 checks the amount of soot based on the differential pressure provided from the differential pressure sensor 150 , and controls the GPF 130 so that the amount of soot is less than the corrected soot amount limit value.

4 is a flowchart illustrating a method for controlling exhaust gas post-treatment according to a second embodiment of the present invention.

Referring to FIG. 4 , the controller 170 checks the fuel consumption ( S410 ). That is, the controller 170 receives and confirms the fuel consumption amount from the data detector 160 . The reason for checking the fuel consumption in this way is to correct the limit value of the suit amount because the amount of ash in the GPF 130 and the amount of fuel consumption are proportional to each other, and when the amount of fuel consumption increases, the amount of ash in the GPF 130 also increases.

The controller 170 confirms a preset basic soot quantity limit value.

The controller 170 determines whether the fuel consumption exceeds a first reference consumption amount (S420). In this case, the first reference consumption amount is a value set to correct the suit amount limit value due to an increase in the fuel consumption amount, and may be set through a predetermined algorithm (eg, a program and a probability model) or may be set by an operator.

When the fuel consumption exceeds the first reference consumption amount, the controller 170 multiplies the basic soot amount limit value and the first correction value to generate a first corrected soot amount limit value ( S430 ). In this case, the first correction value is a value set to correct the basic suit amount limit value, and may be a constant value of 1 or less. The first correction value may be the same as the first correction value described with reference to FIG. 2 .

The first correction value is a preset value, and may be set through a preset algorithm (eg, a program and a probabilistic model) or set by an operator.

The controller 170 determines whether the fuel consumption exceeds a second reference consumption amount (S440). Here, the second reference consumption amount is a value set to correct the suit amount limit value due to an increase in fuel consumption, and may be set through a predetermined algorithm (eg, a program and a probability model) or set by an operator. The second reference consumption amount may be greater than the first reference consumption amount.

Meanwhile, if the fuel consumption is less than or equal to the second reference consumption, the controller 170 returns to step S440 to monitor whether the fuel consumption exceeds the second reference consumption.

When the fuel consumption exceeds the second reference consumption amount, the controller 170 multiplies the basic soot amount limit value and the second correction value to generate a second corrected soot amount limit value ( S450 ).

Here, the second correction value is a value set to correct the basic soot quantity limit value, and may be the same as the second correction value described with reference to FIG. 2 . The second correction value is a constant value of 1 or less, and may be smaller than the first correction value. Second Correction The second correction value is a preset value, and may be set through a preset algorithm (eg, a program and a probability model) or may be set by an operator.

On the other hand, if the fuel consumption is less than or equal to the first reference consumption amount, the controller 170 generates the basic soot amount limit value as the corrected soot amount limit value (S460).

The controller 170 checks the amount of soot in the GPF 130 based on the differential pressure provided from the differential pressure sensor 150 and controls the GPF 130 so that the amount of soot is less than the corrected soot amount limit value (S470).

5 is a flowchart illustrating a method for controlling exhaust gas post-treatment according to a third embodiment of the present invention.

Referring to FIG. 5 , the controller 170 checks the engine on time from the data detector 160 , and checks the basic soot quantity limit value ( S510 ). The reason for checking the engine on time is that the N on time and the amount of ash in the GPF 130 are proportional, so when the amount of ash in the GPF 130 increases, if the GPF 130 is controlled based on the previously set basic suit amount limit value, the GPF Since 130 may be damaged at a high temperature, this is to prevent this.

The controller 170 determines whether the engine on time exceeds a first reference time (S520). Here, the first reference time may be preset as a reference value for correcting the basic suit amount limit value based on the engine on time. The first reference time may be set through a predetermined algorithm (eg, a program and a probabilistic model) or may be set by an operator.

When the engine-on time exceeds the first reference time, the controller 170 multiplies the basic soot quantity limit value and the first correction value to generate a first corrected suit quantity limit value ( S530 ). Here, the first correction value is a constant value of 1 or less, and may be a value set to correct the basic suit amount limit value. The first correction value may be the same as the first correction value described with reference to FIGS. 2 and 4 .

The first correction value is a preset value, and may be set through a preset algorithm (eg, a program and a probabilistic model) or set by an operator.

The controller 170 determines whether the engine on time exceeds a second reference time (S540). In this case, the second reference time is greater than the first reference time, and is a value set to correct the suit amount limit value due to an increase in the engine on time. The second reference time may be set through a predetermined algorithm (eg, a program and a probabilistic model) or may be set by an operator.

Meanwhile, if the engine-on time does not exceed the second reference time, the controller 170 returns to step S540 to monitor whether the engine-on time exceeds the second reference time.

When the engine on time exceeds the second reference time, the controller 170 multiplies the basic soot quantity limit value and the second correction value to generate a second corrected soot quantity limit value ( S550 ).

Here, the second correction value is smaller than the first correction value, and may be a constant value of 1 or less. The first correction value is a value set to correct the basic suit amount limit value, and may be the same as the second correction value described with reference to FIGS. 2 and 4 .

The second correction value is a preset value and may be set through a preset algorithm (eg, a program and a probabilistic model) or may be set by an operator.

On the other hand, if the engine on time is less than or equal to the first reference time, the controller 170 generates a basic soot amount limit value as a corrected soot amount limit value ( S560 ).

The controller 170 checks the amount of soot in the GPF 130 based on the differential pressure provided from the differential pressure sensor 150 and controls the GPF 130 so that the amount of soot is less than the corrected soot amount limit value (S570).

Accordingly, as described above, in the exhaust gas post-treatment system according to the present invention, ash in the GPF 130 increases as at least one of the driving distance, fuel consumption, and engine on time increases, and the ash Accordingly, the soot collection space of the GPF 130 is narrowed, and when suits are accumulated in the narrow space, the relative soot density increases. can do.

Although the above has been described with reference to a preferred embodiment of the present invention, those of ordinary skill in the art may change the present invention in various ways within the scope not departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that modifications and variations are possible.

100: engine
103: intake manifold
105: combustion chamber
107: exhaust manifold
109: injector
120: exhaust pipe
130: GPF
150: differential pressure sensor
160: data detector
170: controller

Claims (13)

a data detector for detecting driving state data of the vehicle;
Gasoline filtration filter for collecting particulate matter contained in the exhaust gas discharged from the engine; and
The driving state data and the basic suit quantity limit value detected by the data detector are checked, the basic suit quantity limit value is corrected according to the driving state data to generate a corrected suit quantity limit value, and the gasoline based on the corrected suit quantity limit value A controller for controlling the regeneration of the filtration filter; including,
The controller confirms that the ash in the gasoline filtration filter is increased through the driving state data, checks the amount of soot collected in the gasoline filtration filter through the differential pressure detected by the differential pressure sensor, and the amount of the collected soot is the corrected soot An exhaust gas aftertreatment system that controls regeneration of the gasoline filtration filter to filter soot before the volume limit is reached. According to claim 1,
the controller
The driving distance of the driving state data is checked, and when the driving distance exceeds the first reference distance, a first corrected suit quantity limit value is generated using the basic suit quantity limit value and the first correction value, and the driving distance is the second 2 When the reference distance is exceeded, the exhaust gas post-treatment system, characterized in that generating a second corrected soot amount limit value by using the basic soot amount limit value and the second correction value. 3. The method of claim 2,
and the second reference distance is greater than the first reference distance. 3. The method of claim 2,
The first correction value and the second correction value are constant values of 1 or less, and the first correction value is greater than the second correction value. According to claim 1,
the controller
Check the fuel consumption of the driving state data, and if the fuel consumption exceeds a first reference consumption amount, a first corrected suit amount limit value is generated by using the basic suit amount limit value and the first correction value, and the fuel consumption amount is 2 Exceeding the reference consumption amount, the exhaust gas after-treatment system, characterized in that the basic soot amount limit value and the second correction value to generate a second corrected soot amount limit value. According to claim 1,
the controller
The engine-on time of the driving state data is checked, and when the engine-on time exceeds a first reference time, a first corrected suit amount limit value is generated using the basic suit amount limit value and the first correction value, and the engine turns on When the time exceeds a second reference time, the second corrected soot amount limit value is generated by using the basic soot amount limit value and the second correction value. checking the driving state data of the vehicle and a preset basic suit quantity limit value;
generating a corrected suit amount limit value by using the basic suit amount limit value and the correction value according to the driving state data; and
Controlling the regeneration of the gasoline filtration filter based on the corrected soot amount limit value; including,
In the step of controlling the regeneration of the gasoline filtration filter, it is confirmed that the ash in the gasoline filtration filter is increased through the driving state data, and the amount of soot collected in the gasoline filtration filter is confirmed through the differential pressure detected by the differential pressure sensor, , an exhaust gas post-treatment control method for controlling regeneration of the gasoline filtration filter to filter soot before the collected soot amount becomes the corrected soot amount limit value. 8. The method of claim 7,
The step of generating the corrected suit amount limit value is
determining whether the driving distance of the driving state data exceeds a first reference distance;
generating a first corrected suit amount limit value by using the basic suit amount limit value and a first correction value when the driving distance exceeds a first reference distance;
determining whether the driving distance exceeds a second reference distance; and
generating a second corrected suit amount limit value by using the basic suit amount limit value and a second correction value when the driving distance exceeds a second reference distance;
Exhaust gas post-treatment control method comprising a. 9. The method of claim 8,
The step of generating the first corrected suit amount limit value is
and generating the first corrected soot quantity limit value by multiplying the basic soot quantity limit value and the first correction value. 9. The method of claim 8,
The step of generating the second corrected suit amount limit value is
and generating the second corrected soot amount limit value by multiplying the basic soot amount limit value and a second correction value. 9. The method of claim 8,
After determining whether the driving distance exceeds the first reference distance,
generating the basic suit amount limit value as the corrected suit amount limit value if the driving distance does not exceed a first reference distance;
Exhaust gas post-treatment control method further comprising a. 8. The method of claim 7,
The step of generating the corrected suit amount limit value is
determining whether the fuel consumption amount of the driving state data exceeds a first reference consumption amount;
generating a first corrected soot quantity limit value using the basic soot quantity limit value and a first correction value when the fuel consumption exceeds a first reference consumption quantity;
determining whether the fuel consumption exceeds a second reference consumption; and
generating a second corrected soot quantity limit value by using the basic soot quantity limit value and a second correction value when the fuel consumption exceeds a second reference consumption quantity;
Exhaust gas post-treatment control method comprising a. 8. The method of claim 7,
The step of generating the corrected suit amount limit value is
determining whether an engine-on time of the driving state data exceeds a first reference time;
generating a first corrected soot quantity limit value using the basic soot quantity limit value and a first correction value when the engine on time exceeds a first reference time;
determining whether the engine on time exceeds a second reference time; and
generating a second corrected soot quantity limit value using the basic soot quantity limit value and a second correction value when the engine on time exceeds a second reference time;
Exhaust gas post-treatment control method comprising a.

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