KR101694073B1 - A METHOD FOR PREVENTING FUEL DETERIORATION ACCORDING TO NOx REGENERATION USING A METHOD FOR ANALYZING DRIVING PATTERN OF VEHICLE - Google Patents

Abstract

The present invention relates to a fuel consumption deterioration prevention method by frequent NOx regeneration using a traveling pattern analysis method of a vehicle. A method for preventing fuel consumption deterioration due to frequent NOx regeneration using a method for analyzing a traveling pattern of a vehicle according to the present invention includes the steps of calculating a weighting factor according to a vehicle traveling pattern (S10); Determining whether the NOx is currently being regenerated (S20); Setting the frequent NOx regeneration areas in the table of the weight elements when the NOx regeneration is not currently performed (S30); (S40) of determining whether the sum (K) of weight elements inside the frequent NOx regeneration area exceeds a predetermined first reference value; (S50) if the sum (K) of weight elements inside the frequent NOx regeneration area exceeds a predetermined first reference value, whether the amount of captured NOx is equal to or greater than a predetermined second reference value; Determining whether the NOx regeneration period is equal to or greater than a preset reference period if the amount of NOx trapped is equal to or greater than a predetermined second reference value (S60); And regenerating NOx if the NOx regeneration period is equal to or greater than a preset reference period (S70). According to the present invention, it is possible to obtain data obtained by analyzing the running pattern of the vehicle and digitizing the engine operating state according to the driver-specific operation pattern. Further, by using this, stability of regeneration control of NOx can be improved, fuel economy of the vehicle can be improved, and exhaust gas purification performance can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing fuel consumption deterioration due to frequent NOx regeneration using a traveling pattern analysis method of a vehicle,

The present invention relates to a fuel consumption deterioration prevention method for frequent NOx regeneration using a driving pattern analysis method of a vehicle, and more particularly, The present invention relates to a method of controlling the NOx regeneration entering time and the entering period in order to prevent the fuel efficiency of the vehicle and deterioration of the purification performance of the exhaust gas in accordance with the entry into the NOx regeneration mode.

The LNT (LEAN NOx TRAP) system is designed to reduce NOx (NOx), which is trapped in the LNT. However, since the NOx storage capacity of the LNT is limited, the LNT regeneration mode (DeNOx Mode) is necessarily required. That is, in normal operation of the LNT, NOx is trapped in the LNT under lean conditions (LEAN), and in the regeneration mode (DeNOx Mode) of the LNT, .

Conventionally, in the case of frequently entering the LNT regeneration mode (DeNOx mode) according to the driver's personal driving habits, the LNT is heated by the pre-desulfurization mode preheating mode Temperature increase step), so that the post injection amount is excessively increased, and the fuel efficiency is lowered accordingly. In addition, in the LNT regeneration mode (DeNOx Mode), NOx can not be trapped in the exhaust gas, which may deteriorate the purifying performance of the exhaust gas.

In response to this, in the prior art, the problem area is generalized by limiting the engine control parameters by the vehicle speed, the engine speed, the engine load, and the exhaust temperature in order to avoid this. That is, the engine is controlled without considering the driving pattern for each driver, thereby avoiding the occurrence of the problem manually. Therefore, it is difficult to cope with various vehicle traveling patterns.

Japanese Patent Application Laid-Open No. 2010-210240 (Sep. 24, 2010)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a method of analyzing a driving pattern of a vehicle, in which, in order to cope with frequent entry into a NOx regeneration mode, And to provide a method for controlling the NOx regeneration entering time and the entering period accordingly.

The fuel consumption deterioration prevention method for frequent NOx regeneration using the method for analyzing the traveling pattern of a vehicle according to the present invention is characterized in that the integrated weighting value at each coordinate (S10) calculating a weighting factor according to a vehicle traveling pattern for each coordinate, which is a ratio of a weighting factor to a weighting factor; Determining whether the LNT is currently regenerating NOx (S20); If the LNT is not currently regenerating NOx, setting a NOx regeneration problem area in the table of weight elements (S30); Determining (S40) whether a sum (K) of weight elements in the NOx regeneration problem area exceeds a predetermined first reference value; (S50) of determining whether the amount of NOx trapped in the LNT is equal to or greater than a predetermined second reference value when the sum (K) of weight elements in the NOx regeneration problem region exceeds a predetermined first reference value; If the amount of NOx trapped in the LNT is equal to or greater than a predetermined second reference value, determining whether the NOx regeneration period is equal to or greater than a preset reference period (S60); And regenerating NOx if the NOx regeneration period is equal to or greater than a preset reference period (S70).

The NOx regeneration problem region is characterized in that the engine load is 0% or more and 7.5% or less, and the engine rotational speed is 780 RPM or more and 3000 RPM or less.

The NOx regeneration problem region is characterized in that the engine load is 45% or more and 100% or less, and the engine rotational speed is 780 RPM or more and 3000 RPM or less.

)을 측정하는 단계(S200); 엔진회전수 및 엔진 부하로 표현되는 엔진 제어 맵 상에서, 측정된 주행패턴(

)에 대한 엔진 운전영역을 도출하는 단계(S300); 상기 측정된 주행패턴(

)으로부터, 상기 엔진 운전영역의 각 꼭지점까지의 거리에 따라 결정되는 각각의 가중치(Weighting)를 계산하는 단계(S400); 상기 계산된 각각의 가중치(Weighting)를 상기 엔진 운전영역 상의 좌표별로 적산하는 단계(S500); 현재의 측정조건이 상기 설정된 측정조건을 벗어나는지 판단하는 단계(S600); 및 현재의 측정조건이 상기 설정된 측정조건을 벗어나는 경우에는, 상기 엔진 운전영역의 모든 좌표에서의 적산된 가중치(Weighting)의 총 합에 대한 각각의 좌표에서의 적산된 가중치(Weighting)의 비율인 상기 설정된 측정조건에서의 각각의 좌표에 대한 가중치 요소(Weighting Factor)를 산출하는 단계(S700);를 포함하는 것을 특징으로 한다.Step S10 of calculating a weighting factor according to the vehicle travel pattern includes: setting a measurement condition of the travel pattern (S100); The running pattern consisting of the engine speed, the engine load, the vehicle speed and the gear stage under the set measurement conditions (

(S200); On the engine control map represented by the engine speed and the engine load, the measured travel pattern (

Gt; S300) < / RTI > The measured travel pattern (

(S400) of each weighting determined according to the distance from each of the vertexes of the engine operation region to the respective vertexes of the engine operation region; (S500) accumulating each of the calculated weights by the coordinates on the engine operation region; Determining whether a current measurement condition is out of the set measurement condition (S600); And when the current measurement condition deviates from the set measurement condition, it is determined that the ratio of the accumulated weighting in each coordinate to the total sum of the accumulated weights in all the coordinates of the engine operation region And calculating a weighting factor for each coordinate in the set measurement condition (S700).

)이 존재하는 픽셀(PIXEL)의 4개의 꼭지점 좌표(

,

,

,

)로 구성된 가상의 블록(BLOCK)인 것을 특징으로 한다.In the step S300 of deriving the engine operation region, the engine operation region is configured to determine, in the engine control map,

) Of the pixel PIXEL in which the pixel PIXEL exists

,

,

,

(BLOCK).

)을 측정하는 단계(S200)를 다시 수행하는 것을 특징으로 한다.When the current measurement condition does not deviate from the set measurement condition, the travel pattern (

(S200) is performed again.

And the traveling condition of the traveling pattern in the setting step (S100) is a condition for continuously measuring the traveling pattern until the set time.

The driving pattern measurement condition in the setting step (S100) is a condition for continuously measuring the traveling pattern during the set time period or day of the week.

The traveling pattern measurement condition in the setting step (S100) is a condition for continuously measuring the traveling pattern when the temperature of the cooling water is equal to or higher than a predetermined first temperature and lower than a predetermined second temperature.

The step S400 of calculating the weighting is characterized by calculating respective weights for four vertexes of the engine operation region according to the following equation.

는

의 좌측 상단 꼭지점

에서의 가중치(weighting)이고,

는

의 우측 상단 꼭지점

에서의 가중치(weighting)이고,

는

의 좌측 하단 꼭지점

에서의 가중치(weighting)이고,

는

의 우측 하단 꼭지점

에서의 가중치(weighting)임.)(here,

The

Top left corner of

, ≪ / RTI >

The

Top right corner of

, ≪ / RTI >

The

The lower left corner of

, ≪ / RTI >

The

The lower right corner of

Weighting.

The step of calculating the weighting factor S700 may be performed by calculating a weighting factor for each coordinate in the set measurement condition according to the following equation.

는 좌표

에서의 적산된 가중치(weighting)이고,

은 엔진 운전영역의 모든 좌표에서의 적산된 가중치(weighting)의 총 합이며,

은 좌표

에서의 가중치 요소(Weighting Factor)임.)(here,

Coordinate

Lt; RTI ID = 0.0 > weighting < / RTI &

Is the total sum of the accumulated weights at all the coordinates of the engine operating region,

Coordinate

(Weighting Factor).

As described above, according to the present invention, the driving pattern of the vehicle can be analyzed, and data obtained by digitizing the engine operating state according to the driving pattern for each driver can be acquired.

Further, by using this, stability of regeneration control of NOx can be improved, fuel economy of the vehicle can be improved, and exhaust gas purification performance can be improved.

1 and 2 are conceptual diagrams for calculating a weighting factor.
3 is a flowchart of a traveling pattern analysis method of a vehicle.
4 is a block diagram of a traveling pattern analyzing apparatus for a vehicle.
5 is an exemplary view showing a weighting factor calculated by a traveling pattern analyzing method of a vehicle.
6 is a flowchart of a method for preventing fuel consumption deterioration due to frequent NOx regeneration using a method of analyzing a traveling pattern of a vehicle according to the present invention.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term to describe its invention in the best way And should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are conceptual diagrams for calculating a weighting factor. Hereinafter, the concept of a weighting factor will be described in detail. In the present invention, as shown in FIG. 1, a virtual block is extracted from a running pattern of a specific vehicle, which is composed of an engine speed, an engine load (fuel amount or engine torque) or a vehicle speed and a gear ratio, Weighting Factor.

는 차량의 실제 운전영역으로써, 주행패턴을 나타낸다. 또한,

,

,

,

로 나타낸 4개의 좌표는

가 통과하는 엔진의 운전영역이다.

는 상기 엔진의 운전영역의 4개의 꼭지점 좌표(

,

,

,

)에 대해 각각 가중치(Weighting)를 부여하게 되며, 이때 가중치는

에 가까울수록 크고, 멀수록 작아진다. 구체적으로 가중치(Weighting)를 산출하는 방법은 후술한다. (S400 단계 참조)1,

Is an actual driving range of the vehicle, and represents a running pattern. Also,

,

,

,

≪ RTI ID = 0.0 >

Is an operation region of the engine through which the engine passes.

Are the four vertex coordinates of the operating region of the engine

,

,

,

), Respectively, where the weights are given by

The smaller the distance, the smaller the distance becomes. Specifically, a method of calculating the weighting will be described later. (Refer to step S400)

The weighting at each vertex calculated as described above is repeatedly accumulated for each vertex coordinate of the operation region of the engine until the current measurement condition deviates from the set measurement condition. In addition, after the current measurement condition deviates from the set measurement condition, the ratio of the weighting at each coordinate to the total weighting of the accumulated total is calculated as a weight factor for each coordinate in the set measurement condition (Weighting Factor). A method for calculating a weighting factor will be described later in detail. (See steps S500 and S700)

)을 측정하는 단계(S200)를 다시 수행하여, 새로이 측정된 주행패턴(

)에 대한 각각의 꼭지점 좌표에서의 가중치(Weighting)를 산출하고, 이를 반복적산한다. When the current measurement condition does not deviate from the set measurement condition,

(S200) is again performed, and the newly measured traveling pattern (

), And iteratively obtains the weighting at each vertex coordinate.

)에 대한 가중치(Weighting)를 산출한 후, 현재의 측정조건이 상기 설정된 측정조건을 벗어나지 않는 경우에는 다음번 주행패턴(

)에 대한 가중치(Weighting)를 산출하는 것이다. 상기 최초의 주행패턴(

)과 상기 다음번 주행패턴(

)은 변동될 수 있다. 이에 따라, 최초의 주행패턴(

)이 존재하는 엔진 운전영역(즉, 상기 엔진 제어 맵에서, 상기 최초의 주행패턴(

)이 존재하는 픽셀(PIXEL)의 4개의 꼭지점 좌표(

,

,

,

)로 구성된 가상의 블록) 역시 상기 다음번의 주행패턴(

)이 존재하는 엔진 운전영역(즉, 상기 엔진 제어 맵에서, 상기 다음번의 주행패턴(

)이 존재하는 픽셀(PIXEL)의 4개의 꼭지점 좌표(

,

,

,

)로 구성된 가상의 블록)으로 이동할 수 있다. 또한, 상기와 같이 이동한 엔진의 운전영역의 각각의 꼭지점에서의 가중치(Weighting)가 산출되면, 상기 가중치(Weighting)는 반복해서 상기 엔진의 운전영역의 각각의 꼭지점 좌표별로 적산되는 것이다.For example, the first driving pattern (

If the current measurement condition does not deviate from the set measurement condition after calculating the weighting for the next driving pattern (

) Is calculated. The first traveling pattern (

) And the next driving pattern (

May vary. Accordingly, the first traveling pattern (

(I.e., in the engine control map, the first running pattern (

) Of the pixel PIXEL in which the pixel PIXEL exists

,

,

,

) Is also used as the next driving pattern

(I.e., in the engine control map, the next driving pattern (

) Of the pixel PIXEL in which the pixel PIXEL exists

,

,

,

Quot;) < / RTI > Also, when the weighting at each vertex of the operation region of the engine is calculated, the weighting is repeatedly integrated for each vertex coordinate of the operation region of the engine.

By using a weighting factor for each coordinate calculated as described above, it is possible to actively solve various problems that may occur in the vehicle engine due to the driver's driving habit (driving pattern). For example, it is possible to analyze an individual driving pattern of a driver and to control the engine so as to show the optimum fuel economy within the exhaust gas regulation value range. In addition, a vehicle having a large idling region or overrun may lower the regeneration target temperature to control the engine to prevent damage to the diesel particulate filter (DPF) under uncontrolled burning conditions. Further, the smoke discharged from the engine varies depending on the engine speed and the engine load. Therefore, it is possible to control the engine so as to prevent frequent DPF regeneration by increasing the intake quantity for SOOT regeneration in a high smoke region. In addition, a vehicle that mainly operates under a full load condition (Full Excel condition) may control the engine to reduce the boost pressure and fuel amount by a certain amount in order to protect the turbocharger. Further, a vehicle that mainly operates in a region where the flow rate of the EGR exhaust gas is high may control the engine so that the intake air amount is increased by a certain amount in order to protect the EGR valve.

)을 측정하는 단계(S200); 엔진회전수 및 엔진 부하로 표현되는 엔진 제어 맵 상에서, 측정된 주행패턴(

)에 대한 엔진 운전영역을 도출하는 단계(S300); 상기 측정된 주행패턴으로부터, 상기 엔진 운전영역의 각 꼭지점까지의 거리에 따라 결정되는 각각의 가중치(Weighting)를 계산하는 단계(S400); 상기 계산된 각각의 가중치(Weighting)를 적산하는 단계(S500); 현재의 측정조건이 상기 설정된 측정조건을 벗어나는지 판단하는 단계(S600); 및 현재의 측정조건이 상기 설정된 측정조건을 벗어나는 경우에는, 상기 엔진 운전영역의 모든 좌표에서의 적산된 가중치(Weighting)의 총 합에 대한 각각의 좌표에서의 적산된 가중치(Weighting)의 비율인 상기 설정된 측정조건에서의 가중치 요소(Weighting Factor)를 산출하는 단계(S700);를 포함한다.3 is a flowchart of a method for analyzing a traveling pattern of a vehicle according to an embodiment of the present invention. Referring to FIG. 3, a method of analyzing a traveling pattern of a vehicle according to an embodiment of the present invention includes: setting a traveling pattern measurement condition (S100); The running pattern consisting of the engine speed and the engine load (fuel amount or engine torque) or the vehicle speed and gear number

(S200); On the engine control map represented by the engine speed and the engine load, the measured travel pattern (

Gt; S300) < / RTI > Calculating (S400) a respective weighting determined according to a distance from the measured travel pattern to each vertex of the engine operation region; (S500) accumulating the calculated weightings; Determining whether a current measurement condition is out of the set measurement condition (S600); And when the current measurement condition deviates from the set measurement condition, it is determined that the ratio of the accumulated weighting in each coordinate to the total sum of the accumulated weights in all the coordinates of the engine operation region And a step (S700) of calculating a weighting factor in the set measurement condition.

)을 측정하는 단계(S200)를 다시 수행하는 것을 특징으로 한다. 예를 들어, 최초의 주행패턴(

)에 대한 가중치(Weighting)를 산출한 후, 현재의 측정조건이 상기 설정된 측정조건을 벗어나지 않는 경우에는 다음번 주행패턴(

)에 대한 가중치(Weighting)를 산출하는 것이다. 상기 최초의 주행패턴(

)과 상기 다음번 주행패턴(

)은 변동될 수 있다. 이에 따라, 최초의 주행패턴(

)이 존재하는 엔진 운전영역(즉, 상기 엔진 제어 맵에서, 상기 최초의 주행패턴(

)이 존재하는 픽셀(PIXEL)의 4개의 꼭지점 좌표(

,

,

,

)로 구성된 가상의 블록) 역시 상기 다음번의 주행패턴(

)이 존재하는 엔진 운전영역(즉, 상기 엔진 제어 맵에서, 상기 다음번의 주행패턴(

)이 존재하는 픽셀(PIXEL)의 4개의 꼭지점 좌표(

,

,

,

)로 구성된 가상의 블록)으로 이동할 수 있다.The traveling pattern analyzing method of the present invention is characterized in that when the present measuring condition does not deviate from the set measuring condition,

(S200) is performed again. For example, the first driving pattern (

If the current measurement condition does not deviate from the set measurement condition after calculating the weighting for the next driving pattern (

) Is calculated. The first traveling pattern (

) And the next driving pattern (

May vary. Accordingly, the first traveling pattern (

(I.e., in the engine control map, the first running pattern (

) Of the pixel PIXEL in which the pixel PIXEL exists

,

,

,

) Is also used as the next driving pattern

(I.e., in the engine control map, the next driving pattern (

) Of the pixel PIXEL in which the pixel PIXEL exists

,

,

,

Quot;) < / RTI >

In the setting step S100, the traveling pattern measurement condition may be a condition for continuously measuring the traveling pattern until the set time. For example, it may be set to 30 hours after the start of measurement. In the setting step S100, the traveling pattern measurement condition may be a condition for continuously measuring the traveling pattern during the set time period or day of the week. For example, it can be set between 9 am and 10 am for 30 days, Monday for 8 weeks, and so on.

The traveling pattern measurement condition in the setting step S100 may be a condition for continuously measuring the traveling pattern when the temperature of the cooling water is equal to or higher than a predetermined first temperature and lower than a predetermined second temperature. That is, the running pattern according to the cooling water temperature condition may be analyzed.

)이 존재하는 픽셀의 4개의 꼭지점 좌표(

,

,

,

)로 구성된 가상의 블록(BLOCK)인 것을 특징으로 한다. 즉, 엔진 제어 맵은 리니어한 테이블이 아니고, 각각의 픽셀(PIXEL)이 집합되어 형성된 가상의 블록(BLOCK)이다. 따라서, 상기 측정된 주행패턴(

)이 픽셀 내부에 존재할 수 있고, 이 경우 픽셀의 4개의 꼭지점 좌표(

,

,

,

)로 구성된 가상의 블록(BLOCK)은 엔진의 운전영역을 의미하게 된다. 따라서, 픽셀 한 칸의 변경이 엔진 제어에 미치는 영향을 백분율(%)로 나타낼 수 있으므로, 엔진 제어 변수의 변경에 따른 연비 또는 배출가스 변화량의 예측이 용이하다.In the step S300 of deriving the engine operation region, the engine operation region is configured to determine, in the engine control map,

) Are the four vertex coordinates (

,

,

,

(BLOCK). That is, the engine control map is not a linear table but a virtual block (BLOCK) formed by collecting each pixel PIXEL. Therefore, the measured travel pattern (

) May exist within the pixel, in which case the four vertex coordinates of the pixel (

,

,

,

(BLOCK) is an operation region of the engine. Therefore, since the influence of the change of one pixel on the engine control can be expressed as a percentage (%), it is easy to predict the fuel consumption or the change amount of the exhaust gas according to the change of the engine control variable.

The step S400 of calculating the weighting is characterized by calculating the respective weights of the four vertexes of the engine operation region according to the following equation (1).

는

의 좌측 상단 꼭지점

에서의 가중치(weighting)이고,

는

의 우측 상단 꼭지점

에서의 가중치(weighting)이고,

는

의 좌측 하단 꼭지점

에서의 가중치(weighting)이고,

는

의 우측 하단 꼭지점

에서의 가중치(weighting)이다.here,

The

Top left corner of

, ≪ / RTI >

The

Top right corner of

, ≪ / RTI >

The

The lower left corner of

, ≪ / RTI >

The

The lower right corner of

Is the weighting of the input signal.

가 4개의 꼭지점 좌표(

,

,

,

)로 구성된 엔진의 운전영역의 각각의 꼭지점에 가까울수록 가중치(Weighting)를 크게 설정하고, 멀수록 작게 설정한 것이다.That is, the measured running pattern

4 < / RTI > vertex coordinates

,

,

,

The weighting is set to be larger toward the respective vertexes of the engine, and the distance to the vertexes is set to be smaller.

The calculating step S700 of calculating the weighting factor may calculate a weighting factor for each coordinate in the set measurement condition according to the following equation (2).

는 좌표

에서의 적산된 가중치(weighting)이고,

은 상기 엔진의 운전영역의 모든 좌표에서의 적산된 가중치(weighting)의 총 합이며,

은 좌표

에서의 가중치 요소(Weighting Factor)이다.

은 적산하는 단계(S500)에서 산출된다.here,

Coordinate

Lt; RTI ID = 0.0 > weighting < / RTI &

Is the total sum of the accumulated weights at all the coordinates of the operating region of the engine,

Coordinate

(Weighting Factor).

Is calculated in step S500.

는 시간이 지남에 따라 변화할 수 있다(도 2에서는

에서

까지 현재 측정조건이 설정된 측정조건을 만족하여 주행패턴이 측정된 것으로 가정함). 이에 따라, 4개의 꼭지점 좌표(

,

,

,

)로 구성된 엔진의 운전영역 역시 변화한다. 즉, 상기 엔진의 운전영역에서

,

,

,

는 모두 좌표

에 해당하게 되는 것이다. For example, as shown in Fig. 2,

Can change over time (see Figure 2)

in

It is assumed that the current measurement condition meets the set measurement condition and the travel pattern is measured). Accordingly, four vertex coordinates (

,

,

,

) Also changes in the operating range of the engine. That is, in the operation region of the engine

,

,

,

All coordinates

.

에서의 가중치(weighting)의 총 합인

은 하기의 수학식 3과 같이 표현된다. 즉,

는 상기 계산된 가중치를 적산하는 단계(S500)에서의 결과값이 되는 것이다. (S500 단계 참조)And coordinate

(Weighting)

Is expressed by the following equation (3). In other words,

Is a resultant value in the step S500 of accumulating the calculated weight values. (Refer to step S500)

With this principle, the total sum of the weights in the respective coordinates shown in Fig. 2 is expressed by the following equation (4). (Refer to step S500)

에서의 가중치 요소(Weighting Factor)인

은 하기의 수학식 5와 같이 표현된다. (S700 단계 참조)Using this,

Which is a weighting factor in

Is expressed by the following equation (5). (See step S700)

That is, after the end of the measurement of the traveling pattern, the ratio of the accumulated weighting in each coordinate to the total sum of the weights in all the coordinates of the operating region of the engine is calculated for each of the And a weighting factor in the coordinates. Thereafter, as described above, various problems that may occur in the vehicle engine due to the driving habit of the driver can be actively solved by using the weighting factor in each of the calculated coordinates.

4 is a block diagram of a traveling pattern analyzing apparatus for a vehicle. Referring to FIG. 4, the traveling pattern analyzing apparatus of the vehicle includes a storage medium 100, a measuring unit 200, and a calculating unit 300.

The storage medium 100 may store the traveling pattern analysis method of the vehicle, the engine control map, the calculated weighting, and the calculated weighting factor.

The measuring unit 200 measures the engine speed and the engine load (fuel amount or engine torque). Alternatively, the vehicle speed and the number of gears may be measured. Also, the measuring unit 200 may measure the temperature of the cooling water.

The calculating unit 300 calculates a weighting value and a weighting value according to the traveling pattern analysis method of the vehicle based on the engine speed measured by the measuring unit 200 and the engine load (fuel amount or engine torque) And calculates a weighting factor.

FIG. 5 is an exemplary view showing weighting factors calculated by a traveling pattern analyzing method of a vehicle, and FIG. 6 is a flowchart of a fuel consumption deterioration preventing method according to a frequent NOx regeneration using the traveling pattern analyzing method of the present invention. Referring to FIGS. 5 and 6, the fuel consumption deterioration prevention method according to the present invention, which is performed by frequent NOx regeneration using the traveling pattern analysis method of the present invention, calculates the total sum of the weightings accumulated in all the coordinates (S10) calculating a weighting factor according to the vehicle traveling pattern for each coordinate, which is a ratio of the weighting accumulated in the respective coordinates to the coordinates of the vehicle; Determining whether the LNT is currently regenerating NOx (S20); A step (S30) of setting a NOx regeneration problem area in the weight element table when the LNT is not currently regenerating NOx; Determining (S40) whether a sum (K) of weight elements in the NOx regeneration problem area exceeds a predetermined first reference value; (S50) of determining whether the amount of NOx trapped in the LNT is equal to or greater than a predetermined second reference value when the sum (K) of weight elements in the NOx regeneration problem region exceeds a predetermined first reference value; If the amount of NOx trapped in the LNT is equal to or greater than a predetermined second reference value, determining whether the NOx regeneration period is equal to or greater than a preset reference period (S60); And regenerating NOx if the NOx regeneration period is equal to or greater than a preset reference period (S70).

In the step S10 of calculating a weighting factor according to the vehicle traveling pattern, the weighting factor according to the vehicle traveling pattern is calculated by performing the steps S100 to S700. At this time, the calculated weighting factor can be expressed as shown in the table of FIG. Further, when it is currently regenerating NOx, it is difficult to control according to the present invention, so that it is determined whether NOx regeneration is currently being performed (S20).

In the step S30 of setting the frequent NOx regeneration area in the table of the weight elements, NOx regeneration may frequently occur in the weight factor table composed of the engine speed and the engine load to utilize as a factor for controlling the NOx regeneration period This is the step of setting the area. In the case of a vehicle in which the engine load is low in a low load or in a high load range, it often enters the regeneration mode of NOx, thereby deteriorating the fuel efficiency of the vehicle and the purification performance of the exhaust gas. Therefore, these areas are set as frequent NOx regeneration areas. For example, referring to FIG. 5, in the frequent NOx regeneration region, the engine load may be 0% or more and 7.5% or less, and the engine speed may be 780 RPM or more and 3000 RPM or less. Also, in the frequent NOx regeneration region, the engine load may be 45% or more and 100% or less, and the engine speed may be 780 RPM or more and 3000 RPM or less.

In step S40, it is determined whether or not the sum K of the weight elements in the NOx regeneration area is greater than the first reference value. The sum (K) of the weighting factors in the frequent NOx regeneration region means the running ratio (%) in the frequent NOx regeneration region during the entire running of the vehicle. For example, in Fig. 5, 0.7 + 2.1 + 2.3 + 0.8 + 0.3 + 0.3 + 0.1 + 7.2 + 7.3 + 2.0 + 0.6 + 0.2 + 0.1 + 0.0 + 8.6 +10.3 + 6.2 + 1.8 + 0.1 + 0.0 + 0.0 + 1.0 (K) in the NOx regeneration area of 67.6, which is + 5.2 + 7.6 + 2.6 + 0.2, which means that the running ratio in the frequent NOx regeneration area during the entire running of the vehicle is 67.6%.

In addition, if the first reference value is set to be large, the sensitivity of the method for preventing excessive dilution of the engine oil by using the traveling pattern analysis method of the vehicle is low. On the other hand, if the first reference value is set small, The sensitivity of the method of prevention increases. For example, when the first reference value is 70, the sum K of the weight elements inside the oil dilution excess region calculated in FIG. 5 does not exceed the first reference value. Therefore, The overdilution prevention method is terminated. However, when the first reference value is 60, the sum K of the weight elements inside the oil dilution excess region calculated in FIG. 5 exceeds the first reference value, so that the excessive oil dilution prevention method Lt; / RTI > are performed.

The second reference value is set to be larger than the reference value in the normal NOx regeneration mode in the step of determining whether the trapped NOx amount is equal to or greater than a predetermined second reference value (S50). This is to make it difficult to enter the NOx regeneration mode and to increase the NOx regeneration period.

In the step S60 of determining whether the NOx regeneration period is equal to or greater than a predetermined reference period, the reference period is set to be longer than the reference period of the normal NOx regeneration mode. This is to prevent the entry of frequent NOx regeneration mode by setting the NOx regeneration cycle to be long, thereby improving the stability of regeneration control of NOx, and improving fuel economy and exhaust gas purification performance of the vehicle.

The step of regenerating NOx (S70) is a step of performing normal NOx regeneration in which NOx is released from the LNT under the condition that the temperature is high and the amount of injected fuel is rich (RICH), and a detailed description thereof will be omitted.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, as claimed, and will be fully understood by those of ordinary skill in the art. The present invention is not limited thereto. It will be apparent to those skilled in the art that various substitutions, modifications and variations are possible within the scope of the present invention, and it is obvious that those parts easily changeable by those skilled in the art are included in the scope of the present invention .

100 storage medium
200 measuring unit
300 operation unit

Claims (11)

A weighting factor according to the vehicle traveling pattern for each coordinate, which is the ratio of the accumulated weighting in each coordinate to the total sum of the accumulated weights in all the coordinates of the engine operating region, (S10);
Determining whether the LNT is currently regenerating NOx (S20);
If the LNT is not currently regenerating NOx, setting a NOx regeneration problem area in the table of weight elements (S30);
Determining (S40) whether a sum (K) of weight elements in the NOx regeneration problem area exceeds a predetermined first reference value;
(S50) of determining whether the amount of NOx trapped in the LNT is equal to or greater than a predetermined second reference value when the sum (K) of weight elements in the NOx regeneration problem region exceeds a predetermined first reference value;
If the amount of NOx trapped in the LNT is equal to or greater than a predetermined second reference value, determining whether the NOx regeneration period is equal to or greater than a preset reference period (S60); And
Regenerating NOx if the NOx regeneration cycle is equal to or greater than a preset reference period (S70);
A method for preventing deterioration of fuel consumption due to frequent NOx regeneration using a traveling pattern analysis method of a vehicle. The method according to claim 1,
Wherein the NOx regeneration problem region has an engine load of not less than 0% and not more than 7.5% and an engine rotational speed of not less than 780 RPM and not more than 3000 RPM. The method according to claim 1,
Wherein the NOx regeneration problem region has an engine load of 45% or more and 100% or less and an engine rotational speed of 780 RPM or more and 3000 RPM or less. The method according to claim 1,
Step S10 of calculating a weighting factor according to the vehicle travel pattern includes: setting a measurement condition of the travel pattern (S100);
The running pattern consisting of the engine speed, the engine load, the vehicle speed and the gear stage under the set measurement conditions (

(S200);
On the engine control map represented by the engine speed and the engine load, the measured travel pattern (

Gt; S300) < / RTI >
The measured travel pattern (

(S400) of each weighting determined according to the distance from each of the vertexes of the engine operation region to the respective vertexes of the engine operation region;
(S500) accumulating each of the calculated weights by the coordinates on the engine operation region;
Determining whether a current measurement condition is out of the set measurement condition (S600); And
Wherein when the current measurement condition deviates from the set measurement condition, the weighted sum of the accumulated weights in each coordinate with respect to the total sum of the accumulated weights in all the coordinates of the engine operation region, Calculating a weighting factor for each coordinate in the measurement condition (S700);
Wherein the fuel consumption of the vehicle is estimated based on the measured fuel consumption. 5. The method of claim 4,
In the step S300 of deriving the engine operation region, the engine operation region is configured to determine, in the engine control map,

) Of the pixel PIXEL in which the pixel PIXEL exists

,

,

,

The method for preventing deterioration of fuel consumption according to the method for analyzing the running pattern of a vehicle according to claim 1, 5. The method of claim 4,
When the current measurement condition does not deviate from the set measurement condition, the travel pattern (

(NO in step S200). The method for preventing deterioration of fuel consumption by frequent NOx regeneration using the method of analyzing the traveling pattern of a vehicle. 5. The method of claim 4,
Wherein the measurement condition of the traveling pattern in the setting step (S100) is a condition for continuously measuring the traveling pattern until the set time, and the frequent NOx regeneration according to the traveling pattern analysis method of the vehicle. 5. The method of claim 4,
Wherein the measurement condition of the running pattern in the setting step (S100) is a condition for continuously measuring the running pattern during the set time period or the day of the week, wherein the method for preventing fuel consumption deterioration by frequent NOx regeneration using the running pattern analyzing method of the vehicle . 5. The method of claim 4,
Wherein the traveling pattern measurement condition in the setting step (S100) is a condition for continuously measuring the traveling pattern when the temperature of the cooling water is equal to or higher than a predetermined first temperature and lower than a predetermined second temperature A Method for Preventing Worsening of Fuel Consumption by Frequent NOx Regeneration Using Pattern Analysis Method. 5. The method of claim 4,
The step of calculating the weighting (S400) calculates the respective weights for the four vertexes of the engine operation region according to the following formula: A method to prevent deterioration of fuel consumption by frequent NOx regeneration.

(here,

The

Top left corner of

, ≪ / RTI >

The

Top right corner of

, ≪ / RTI >

The

The lower left corner of

, ≪ / RTI >

The

The lower right corner of

Weighting. 5. The method of claim 4,
The step of calculating the weighting factor (S700) calculates a weighting factor for each coordinate in the set measurement condition according to the following equation: < EMI ID = A Method for Preventing Worsening of Fuel Consumption due to Frequent NOx Regeneration by the Method.

(here,

Coordinate

Lt; RTI ID = 0.0 > weighting < / RTI &

Is the total sum of the accumulated weights at all the coordinates of the engine operating region,

Coordinate

(Weighting Factor).

Images