KR20190030901A - Exhaust gas purification device and method of calculating hydrocarbon poisoning amount in sdpf - Google Patents

Abstract

A method for calculating hydrocarbon (HC) poisoning amount in an SDPF (diesel particle filter with SCR coating) according to one embodiment of the present invention calculates the HC poisoning amount in the SDPF of an exhaust gas purification device including an engine, a lean NOx trap (LNT), and the SDPF coated with an SCR catalyst on a filter. The method includes: sensing an engine operating state, a front temperature of the SDPF, an internal temperature of the SDPF, the amount of HC at the rear end of LNT, and an exhaust flow rate in the SDPF; calculating an HC flow rate which is weakly adsorbed to the SDPF from the engine operating state, the SDPF front temperature, the SDPF internal temperature, the HC amount at the rear end of the LNT, and the SDPF exhaust flow rate; calculating an HC flow amount strongly adsorbed to the SDPF the engine operating state, the SDPF front temperature, the SDPF internal temperature, the HC amount at the rear end of the LNT, and the SDPF exhaust flow rate; calculating a first cumulative HC amount by applying the HC amount weakly adsorbed in the SDPF to a first desorption map; calculating a second cumulative HC amount by applying the HC amount strongly adsorbed in the SDPF to a second desorption map; calculating a degradation factor by the HC based on the first cumulative HC amount and the second cumulative HC amount, and calculating a final HC poisoning amount in the SDPF by applying a variable to the deterioration factor caused by the HC.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying apparatus and a method for calculating hydrocarbon poisoning amount in an SDPF,

The present invention relates to an apparatus for purifying exhaust gas of a vehicle and a hydrocarbon (HC) poisoning amount in SDPF. More particularly, the present invention relates to an SCR catalyst which is deteriorated by poisoning by HC adsorbed by fuel in SDPF, The exhaust gas purifying apparatus for calculating the HC poisoning amount for desorbing adsorbed HC through the urea injection and the exhaust gas temperature raising or the like, and a calculation method thereof.

Generally, the exhaust gas discharged from the engine through the exhaust manifold is guided to a catalytic converter installed in the exhaust pipe, purified, passed through a muffler to attenuate noise, and then discharged to the atmosphere through a tail pipe. The above-described catalytic converter purifies pollutants contained in the exhaust gas. A soot filter for collecting particulate matters (PM) contained in the exhaust gas is mounted on the exhaust pipe.

One of the catalyst types applicable to the above-described catalytic converter is a selective catalytic reduction (SCR) catalyst.

The SCR catalyst is referred to as selective reduction in the sense that a reducing agent such as Urea, ammonia, carbon monoxide and hydrocarbon (HC) reacts better with nitrogen oxide among oxygen and nitrogen oxides.

Recently, in order to prevent the deterioration of the nitrogen oxide purification performance by the HC adsorbed in the SCR catalyst, the amount of the HC poisoning in the SCR catalyst is predicted, the reducing agent injection amount is determined using the predicted result, Research is being carried out.

However, HC pouring prediction can be achieved simply by using modeling in a SCR catalyst or by using a thermal or irreversible method. Therefore, when the SCR catalyst is exposed for a long time only under a low temperature condition such as a city operation, it is impossible to prevent deterioration of nitrogen oxide purification performance due to inaccurate poisoning prediction.

In order to solve the above problems, the present invention provides an exhaust gas purifying apparatus and a method of calculating the HC pumping amount in the SDPF by improving the accuracy of estimating the HC pumping amount by calculating the HC pumping amount by classifying irreversible adsorption and reversible adsorption, .

An exhaust gas purifying apparatus according to an embodiment of the present invention includes an injector for injecting fuel into the exhaust gas purifying apparatus. The exhaust purifying apparatus generates power by burning a mixture of air and fuel, and exhausts the exhaust gas generated in the combustion process through an exhaust pipe (NOx) contained in the exhaust gas in an atmosphere having an air-fuel ratio lean, and a nitrogen oxide (NOx) adsorbed in an enriched atmosphere is adsorbed to the exhaust pipe A lean NOx trap (LNT) for desorbing and reducing nitrogen oxides or desorbed nitrogen oxides contained in the exhaust gas using a reducing agent containing carbon or hydrogen contained in the exhaust gas; A diesel particulate filter (SDPF) in which a filter is coated with an SCR catalyst to reduce nitrogen oxides contained in the exhaust gas using the reducing agent, and an engine operating state, an SDPF shear Determining an SDPF catalyst deterioration factor by determining HC, an internal temperature of the SDPF, an amount of HC after the LNT, and an exhaust flow rate of the SDPF, calculating an SDPF catalyst deterioration factor by HC, calculating a final HC poisoning amount in the SDPF, And a control unit for controlling SDPF reproduction.

The control unit firstly calculates the HC flow amount absorbed weakly to the SDPF from the engine operation state, the SDPF front end temperature, the SDPF internal temperature, the LNT downstream HC amount, and the SDPF exhaust flow rate, The HC flow rate strongly adsorbed to the SDPF is secondly calculated from the SDPF shear temperature, the SDPF internal temperature, the HC amount at the downstream end of the LNT, and the SDPF exhaust flow rate, and then the HC flow amount absorbed weakly to the SDPF and the SDPF It is possible to calculate the final amount of HC adsorbed in the SDPF by summing the adsorbed HC flow rates.

The HC flow amount absorbed weakly to the SDPF can be calculated by substituting the SDPF internal temperature and the HC amount of the downstream LNT into the first conversion map.

The HC flow rate strongly adsorbed to the SDPF can be calculated by substituting the SDPF internal temperature and the LNT downstream HC amount into the second conversion map.

Wherein the control unit calculates a first accumulated HC amount by substituting the HC flow amount absorbed weakly in the SDPF calculated in the first place into the first desorption map and sets the HC flow amount strongly adsorbed in the second determined SDPF to the second desorption map, It is possible to calculate the second accumulated HC amount by substituting it into the desorption map.

The control unit may calculate the deterioration factor by the HC by substituting the first cumulative HC amount and the second cumulative HC amount into the third conversion map.

The control unit may calculate a final HC poisoning amount in the SDPF by substituting a parameter into the deterioration factor by the HC.

The HC flow amount absorbed weakly to the SDPF may be a value obtained by subtracting the HC amount desorbed from the SDPF at the HC amount after the LNT at the first temperature.

The first temperature may be between 550 and 700 degrees.

The HC flow rate strongly adsorbed to the SDPF may be a value obtained by subtracting the amount of HC desorbed from the SDPF at the HC amount in the downstream end of the LNT at a second temperature higher than the first temperature.

The second temperature may be between 800 and 900 degrees.

Meanwhile, the method of calculating the HC poisoning amount in the SDPF according to an embodiment of the present invention includes an engine, a lean NOx trap (LNT), and an exhaust gas containing a diesel particulate filter (SDPF) A method for calculating a hydrocarbon (HC) poisoning amount in the SDPF of a gas purifier, the method comprising the steps of: sensing an engine operating state, an SDPF shear temperature, an SDPF internal temperature, an HC amount of the LNT rear end and an exhaust flow rate in the SDPF Calculating the HC flow amount absorbed weakly to the SDPF from the engine operation state, the SDPF front end temperature, the SDPF internal temperature, the LNT downstream HC amount, and the SDPF exhaust flow rate; Calculating a HC flow rate strongly absorbed in the SDPF from the shear temperature, the SDPF internal temperature, the amount of HC downstream of the LNT, and the SDPF exhaust flow rate; Calculating a second cumulative HC amount by substituting the HC adsorption amount strongly absorbed in the SDPF into a second desorption map, calculating a second cumulative HC amount by comparing the first cumulative HC amount with the second cumulative HC amount, Calculating a deterioration factor by the HC from the HC amount, and calculating a final HC poisoning amount in the SDPF by substituting a variable into the deterioration factor by the HC.

Wherein the step of calculating the HC adsorbed to the SDPF and the step of calculating the HC adsorbed strongly to the SDPF are carried out in such a manner that the SDPF internal temperature and the HC amount of the downstream LNT are respectively converted into the first conversion map and the second conversion map And the HC flow rate is calculated by substitution.

The step of calculating the deterioration factor by HC may be such that the deterioration factor is calculated by substituting the first cumulative HC amount and the second cumulative HC amount into the third conversion map.

According to the embodiment of the present invention, it is possible to improve the purification performance of nitrogen oxides by improving the prediction accuracy of HC poisoning in SDPF by calculating the HC poisoning by dividing the case of irreversible adsorption and reversible adsorption.

1 is a schematic view showing an exhaust gas purifying apparatus according to an embodiment of the present invention.
2 is a block diagram for explaining a method of calculating the HC blood poisoning amount in SDPF according to an embodiment of the present invention.
3 is a flow chart of a method for calculating the HC poisoning amount in SDPF according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In addition, in the various embodiments, elements having the same configuration are denoted by the same reference numerals, and only other configurations will be described in the other embodiments.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. Also, to the same structure, element, or component appearing in more than one of the figures, the same reference numerals are used to denote similar features. When referring to a portion as being "on" or "on" another portion, it may be directly on the other portion or may be accompanied by another portion therebetween.

The embodiments of the present invention specifically illustrate one embodiment of the present invention. As a result, various variations of the illustration are expected. Thus, the embodiments are not limited to any particular form of the depicted area, but also include variations in form, for example, by manufacture.

Hereinafter, an exhaust gas purifying apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

FIG. 1 is a schematic view showing an exhaust gas purifying apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram for explaining a method of calculating the HC pouring amount in SDPF according to an embodiment of the present invention.

1 and 2, an exhaust apparatus of an internal combustion engine includes an engine 10, an exhaust pipe 20, an exhaust gas recirculation (EGR) apparatus 30, a Lean NOx trap (LNT) An injecting module 50, a particulate filter 60, and a control unit 70. The control unit 70 includes a control unit 70,

The engine 10 converts chemical energy into mechanical energy by burning a mixture in which fuel and air are mixed. The engine 10 is connected to the intake manifold 16 to receive air into the combustion chamber 12 and the exhaust gas generated in the combustion process is collected in the exhaust manifold 18 and then discharged out of the engine 10 . An injector 14 is mounted in the combustion chamber 12 to inject fuel into the combustion chamber 12.

Here, a diesel engine is exemplified, but a lean burn gasoline engine may be used. When a gasoline engine is used, the mixer is introduced into the combustion chamber 12 through the intake manifold 16, and an ignition plug (not shown) for ignition is mounted above the combustion chamber 12. In addition, when a gasoline direct injection (GDI) engine is used, the injector 14 is mounted on the top of the combustion chamber 12, like a diesel engine.

The exhaust pipe 20 is connected to an exhaust manifold 18 to exhaust the exhaust gas to the outside of the vehicle. The LNT 40, the injection module 50 and the particulate filter 60 are mounted on the exhaust pipe 20 to remove hydrocarbon (HC), carbon monoxide (CO), particulate matter, and nitrogen oxides (NOx) Remove.

The exhaust gas recirculation device 30 is mounted on the exhaust pipe 20 to re-supply a part of the exhaust gas discharged from the engine 10 to the engine 10 through the exhaust gas recirculation device 30. Further, the exhaust gas recirculation device 30 is connected to the intake manifold 16 to mix a part of the exhaust gas with air to control the combustion temperature. The control of the combustion temperature is performed by controlling the amount of the exhaust gas supplied to the intake manifold 16 under the control of the controller 70. [ Therefore, a recirculation valve (not shown) controlled by the control unit 70 may be mounted on the line connecting the exhaust gas recirculation device 30 and the intake manifold 16.

A first oxygen sensor 72 is mounted on the exhaust pipe 20 of the exhaust gas recirculation device 30 to detect the amount of oxygen in the exhaust gas passing through the exhaust gas recirculation device 30 and transmit the detected amount of oxygen to the control device 70, (70) to assist in performing lean / rich control of the exhaust gas.

A first temperature sensor 74 is mounted on the rear exhaust pipe 20 of the exhaust gas recirculation device 30 to detect the temperature of the exhaust gas that has passed through the exhaust gas recirculation device 30. [

The LNT 40 is mounted on a rear exhaust pipe 20 of the exhaust gas recirculation device 30. The LNT 40 stores nitrogen oxides (NOx) contained in the exhaust gas in a lean atmosphere and desorbs the nitrogen oxides occluded in a rich atmosphere. The nitrogen oxide or desorbed nitrogen contained in the exhaust gas Reduce the oxide. Further, the LNT 40 oxidizes carbon monoxide and hydrocarbons contained in the exhaust gas.

Here, it should be understood that hydrocarbons refer to both exhaust gas and compounds composed of carbon and hydrogen contained in the fuel.

A second oxygen sensor 76 and a first NOx sensor 80 are mounted on the rear exhaust pipe 20 of the LNT 40.

The second oxygen sensor 76 measures the amount of oxygen contained in the exhaust gas flowing into the particulate filter 60 and transmits a signal to the controller 70. Based on the detection values of the first oxygen sensor 72 and the second oxygen sensor 76, the control unit 70 can perform lean / rich control of the exhaust gas.

The first NOx sensor 80 measures the amount of NOx contained in the exhaust gas flowing into the particulate filter 60 and transmits a signal to the controller 70. The NOx amount measured in the first NOx sensor 80 may be used to determine the amount of reducing agent to be injected in the injection module 50. [

The injection module 50 is attached to the front end exhaust pipe 20 of the particulate filter 60 and is controlled by the control unit 70 to inject the reducing agent into the exhaust gas. Typically, the injection module 50 injects an element and the injected element is converted to ammonia by hydrolysis. However, the reducing agent is not limited to ammonia.

A mixer 55 is mounted on the exhaust pipe 20 at the rear end of the injection module 50 to uniformly mix the reducing agent with the exhaust gas.

The particulate filter 60 is attached to the exhaust pipe 20 at the rear end of the mixer 55 and collects the particulate matter contained in the exhaust gas and uses the reducing agent injected from the injection module 50 to collect particulate matter contained in the exhaust gas Reduce nitrogen oxides. For this purpose, the particulate filter 60 may comprise a selective catalytic reduction catalyst (SDPF) 62 and an optional selective reduction (SCR) catalyst 64 , But not limited to.

On the other hand, in the present specification and claims, the name SCR catalyst should be interpreted to include both the SCR catalyst itself or SDPF.

The SDPF 62 is coated with an SCR catalyst on the partition walls constituting the channels of the DPF. Typically, the DPF includes a plurality of inlet and outlet channels. The inlet channel is open at its one end and closed at its other end, and the exhaust gas flows from the front end of the DPF. Further, one end of the outlet channel is closed and the other end thereof is opened to exhaust the exhaust gas inside the DPF. The exhaust gas flowing into the DPF through the inlet channel enters the outlet channel through the porous partition dividing the inlet channel and the outlet channel and is discharged from the DPF through the outlet channel. Particulate matter contained in the exhaust gas is collected during the passage of the exhaust gas through the porous partition wall. Further, the SCR catalyst coated on the SDPF 62 reduces the nitrogen oxide contained in the exhaust gas by using the reducing agent injected from the injection module 50.

An additional SCR catalyst 64 is mounted at the rear end of the SDPF 62. The additional SCR catalyst 64 can further reduce nitrogen oxides if the nitrogen oxide in the SDPF 62 can not be completely purified. The additional SCR catalyst 64 may be mounted physically spaced apart from the SDPF 62.

A second temperature sensor 56 is mounted on the front end of the particulate filter 60 of the exhaust pipe 20 and a third temperature sensor 66 is mounted on the SDPF 62. The second temperature sensor 56 measures the temperature of the exhaust gas flowing into the SDPF 62 and transmits a signal to the control unit 70. Also, the third temperature sensor 66 measures the internal temperature of the SDPF and transmits a signal to the controller 70.

An exhaust flow rate sensor 68 is mounted on the SDPF 62. The exhaust flow rate sensor 68 measures the exhaust gas flow rate through the SDPF 62 and transmits a signal to the control unit 70.

A second NOx sensor 82 is mounted on the exhaust pipe 20 at the rear end of the soot filter 60. The second NOx sensor 82 detects the amount of nitrogen oxide contained in the exhaust gas discharged from the soot filter 60 and transmits a signal to the control unit 70. The control unit 70 can monitor whether the soot filter 60 normally removes the nitrogen oxide contained in the exhaust gas based on the detection value of the second NOx sensor 82. [ That is, the second NOx sensor 82 can be used to evaluate the performance of the soot filter 60. [

The controller 70 determines the engine operation state 110, the SDPF shear temperature 112, the SDPF internal temperature 114, the LNT tail hydrocarbon amount 116, and the SDPF exhaust flow rate 118, To calculate SDPF catalyst deterioration factor 140 from which the final HC poisoning amount 150 in SDPF can be calculated and SDPF regeneration can be controlled.

For this purpose, the control unit 70 may be implemented with one or more processors operating with the set program, and the set program may be configured to perform each step of the method of calculating the HC blood poisoning in SDPF according to an embodiment of the present invention It may be programmed.

The control unit 70 controls the HC flow amount absorbed weakly to the SDPF from the engine operation state 110, the SDPF front end temperature 112, the SDPF internal temperature 114, the LNT rear end HC amount 116 and the SDPF exhaust flow amount 118 And is strongly adsorbed to the SDPF from the engine operating state 110, the SDPF front end temperature 112, the SDPF internal temperature 114, the LNT rear end HC amount 116, and the SDPF exhaust flow amount 118 The HC flow rate 130 is secondarily calculated and then the HC flow rate 120 absorbed weakly in the SDPF and the HC flow rate 130 strongly absorbed in the SDPF are summed to calculate the final HC poisoning amount 150 adsorbed to the SDPF do.

The HC flow rate 120 weakly adsorbed to the SDPF can be calculated by substituting the SDPF internal temperature 114 and the LNT downstream HC amount 116 into the first conversion map 120. The HC flow rate 120 strongly adsorbed to the SDPF 130 can be calculated by substituting the SDPF internal temperature 114 and the LNT downstream HC amount 116 into the second conversion map 164.

On the other hand, the HC flow rate 120 slightly adsorbed to the SDPF may be a value obtained by subtracting the HC amount desorbed from the SDPF in the HC amount 116 after the LNT at the first temperature, and the first temperature may be 550 to 700 degrees .

Also, the HC flow rate 130 strongly adsorbed to the SDPF may be a value obtained by subtracting the amount of HC desorbed from the SDPF at the LNT-end HC amount 116 at the second temperature higher than the first temperature, and the second temperature is 800 degrees To 900 degrees.

The control unit 70 calculates the first cumulative HC amount 122 by substituting the HC flow amount 120 adsorbed weakly into the first calculated SDPF into the first desorption map 172, The second accumulated HC amount 132 can be calculated by substituting the absorbed HC flow rate 130 into the second desorption map 174. [

The control unit 70 substitutes the first cumulative HC amount 122 and the second cumulative HC amount 132 into the third conversion map 166 to calculate the deterioration factor 140 by the HC. The control unit 70 calculates the final HC poisoning amount 150 in the SDPF by substituting the variable 176 into the deterioration factor 140 by the HC.

Hereinafter, referring to FIG. 3, a description will be given of a method of calculating the HC blood poisoning amount in SDPF according to an embodiment of the present invention.

3 is a flow chart of a method for calculating the HC poisoning amount in SDPF according to an embodiment of the present invention.

3, the hydrocarbon purging amount in the SDPF of an exhaust gas purifying apparatus including an engine, a Lean NOx Trap (LNT), and a diesel particulate filter (SDPF) First, the engine operation state, the SDPF shear temperature, the SDPF internal temperature, the LNT trailing end HC amount, and the exhaust flow rate in the SDPF are sensed (S301).

Thereafter, the HC flow amount absorbed weakly in the SDPF is calculated from the engine operation state, the SDPF shear temperature, the SDPF internal temperature, the LNT trailing end HC amount, and the SDPF exhaust flow amount (S302).

The step S302 of calculating the HC adsorbed to the SDPF may be performed by substituting the SDPF internal temperature and the LNT downstream HC amount into the first conversion map.

Thereafter, the HC flow rate strongly adsorbed to the SDPF is calculated from the engine operating state, the SDPF shear temperature, the SDPF internal temperature, the LNT trailing end HC amount, and the SDPF exhaust flow rate (S303).

The step (S303) of calculating the HC adsorbed strongly to the SDPF may be such that the HC flow rate is calculated by substituting the SDPF internal temperature and the LNT downstream HC amount into the second conversion map.

Subsequently, the HC amount of the HC adsorbed to SDPF is substituted into the first desorption map to calculate the first cumulative HC amount (S304).

Thereafter, the amount of HC adsorbed strongly to the SDPF is substituted into the second desorption map to calculate the second accumulated HC amount (S305).

Thereafter, a deterioration factor by HC is calculated from the first cumulative HC amount and the second cumulative HC amount (S306).

The step of calculating the deterioration factor by HC (S306) may be such that the deterioration factor is calculated by substituting the first cumulative HC amount and the second cumulative HC amount into the third conversion map.

Subsequently, the final HC poisoning amount in the SDPF is calculated by substituting the deterioration factor by the HC (S307).

As described above, according to the embodiment of the present invention, by calculating the HC poisoning by distinguishing the irreversible adsorption of HC strongly adsorbed on SDPF and the reversible adsorption on HC adsorbed weakly on SDPF, the prediction accuracy of HC poisoning in SDPF And the nitrogen oxide purification performance can be improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

10: engine 20: exhaust pipe
30: Exhaust gas recirculation (EGR) device
40: Lean NOx Trap (LNT)
50: injection module 60: particulate filter
70:
62: Selective Catalytic Reduction on Diesel Particulate Filter (SDPF) coated with selective reduction catalyst
64: SCR catalyst

Claims (14)

An engine that includes an injector for injecting fuel into the engine and generates power by burning a mixture of air and fuel and discharges the exhaust gas generated in the combustion process to the outside through an exhaust pipe;
(NOx) contained in the exhaust gas in an atmosphere where the air-fuel ratio is lean, the nitrogen oxide absorbed in the rich atmosphere is desorbed, and the nitrogen oxide contained in the exhaust gas Lean NOx Trap (LNT) which reduces nitrogen oxides or desorbed nitrogen oxides by using a reducing agent containing carbon or hydrogen contained in the exhaust gas;
A diesel particulate filter (SDPF) disposed on the downstream side of the LNT and coated with an SCR catalyst to reduce nitrogen oxides contained in the exhaust gas using the reducing agent; And
The SDPF catalyst deterioration factor by the HC is determined by determining the engine operation state, the SDPF shear temperature, the SDPF internal temperature, the LNT downstream hydrocarbon (HC) amount, and the SDPF exhaust flow rate, And controlling the SDPF regeneration. 2. The exhaust gas purifying apparatus according to claim 1, The method of claim 1,
Wherein,
The HC flow amount absorbed weakly to the SDPF from the engine operating state, the SDPF front end temperature, the SDPF internal temperature, the LNT downstream HC amount, and the SDPF exhaust flow rate,
The HC flow rate strongly adsorbed to the SDPF is secondarily calculated from the engine operation state, the SDPF front end temperature, the SDPF internal temperature, the HC amount after the LNT, and the SDPF exhaust flow rate,
And summing up the HC flow rate absorbed weakly to the SDPF and the HC flow amount strongly adsorbed to the SDPF to calculate a final HC poisoning amount adsorbed to the SDPF. 3. The method of claim 2,
The HC flow rate adsorbed weakly to the SDPF,
The internal temperature of the SDPF, and the HC amount of the downstream LNT, into the first conversion map. 4. The method of claim 3,
The HC flow rate, strongly adsorbed to the SDPF,
The internal temperature of the SDPF and the HC amount of the downstream LNT are substituted into the second conversion map. 5. The method of claim 4,
Wherein,
Calculating a first cumulative HC amount by substituting the HC adsorbed to the SDPF which is calculated in the first order into the first desorption map,
And the second cumulative HC amount is calculated by substituting the HC adsorption amount strongly adsorbed to the SDPF determined in the second order into the second desorption map. The method of claim 5,
Wherein,
And substituting the first cumulative HC amount and the second cumulative HC amount into a third conversion map to calculate a deterioration factor by the HC. The method of claim 6,
Wherein,
And calculating a final HC poisoning amount in the SDPF by substituting a variable into the deterioration factor by the HC. 4. The method of claim 3,
The HC flow rate adsorbed weakly to the SDPF,
And a value obtained by subtracting the amount of HC desorbed from the SDPF at the HC amount after the LNT at the first temperature. 9. The method of claim 8,
Wherein the first temperature is from 550 to 700 degrees. The method of claim 9,
The HC flow rate, strongly adsorbed to the SDPF,
And a value obtained by subtracting the amount of HC desorbed from the SDPF at a HC amount after the LNT at a second temperature higher than the first temperature. 11. The method of claim 10,
And the second temperature is 800 to 900 degrees. (HC) poisoning amount in the exhaust gas purifying apparatus including an engine, a Lean NOx Trap (LNT), and a diesel particulate filter (SDPF) coated with an SCR catalyst on the filter, ,
Sensing the engine operation state, the SDPF shear temperature, the SDPF internal temperature, the amount of HC downstream of the LNT, and the exhaust flow rate in the SDPF;
Calculating a HC flow rate which is weakly adsorbed to the SDPF from the engine operation state, the SDPF front end temperature, the SDPF internal temperature, the HC amount downstream of the LNT, and the SDPF exhaust flow rate;
Calculating an HC flow amount strongly adsorbed to the SDPF from the engine operating state, the SDPF shear temperature, the SDPF internal temperature, the HC amount at the downstream end of the LNT, and the SDPF exhaust flow rate;
Calculating a first accumulated HC amount by substituting a HC adsorption amount weakly adsorbed on the SDPF into a first desorption map;
Calculating a second cumulative HC amount by substituting a HC adsorption amount strongly adsorbed on the SDPF into a second desorption map;
Calculating a deterioration factor by HC from the first cumulative HC amount and the second cumulative HC amount; And
And calculating a final HC poisoning amount in the SDPF by substituting a variable into the deterioration factor by the HC. The method of claim 12,
Calculating a HC flow rate that is weakly adsorbed to the SDPF, and
Wherein the step of calculating the HC adsorbed strongly to the SDPF comprises:
Wherein the HC flow rate is calculated by substituting the SDPF internal temperature and the LNT downstream HC amount into the first conversion map and the second conversion map, respectively, in the SDPF. The method of claim 13,
Wherein the step of calculating the deterioration factor by the HC comprises:
And calculating a degradation factor by substituting the first cumulative HC amount and the second cumulative HC amount into a third conversion map.

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