KR20140037573A - Apparatus and method for calculating mobile emission - Google Patents

Abstract

The present invention relates to an apparatus for calculating an exhaust gas amount and a method for calculating the exhaust gas amount. The apparatus for calculating an exhaust gas amount according to an embodiment of the present invention includes measuring data including traffic volume or speed of each vehicle measured for a plurality of road sections. An estimation data acquisition unit for obtaining estimation data including at least one of an estimated road length, traffic volume and traffic speed for each of the plurality of road sections; It includes an exhaust gas emissions calculation unit for calculating the exhaust gas emissions for the target road section by using.
Accordingly, it is possible to obtain more accurate exhaust gas emissions by calculating the exhaust gas emissions by determining whether the measured data and the estimated data are in error.

Description

Exhaust Emission Computation Device and Its Calculation Method {APPARATUS AND METHOD FOR CALCULATING MOBILE EMISSION}

The present invention relates to an apparatus for calculating an exhaust gas amount and a method of calculating the same, and more particularly, a technology for calculating exhaust gas amount by verifying reliability of data on a road section is disclosed.

Recently, air pollution caused by growth-oriented development has become a major social problem. In order to effectively manage this, it is necessary to accurately grasp the air pollution level, and since 1999, the government has established the 'Air Policy Support System Project', which is mainly focused on the calculation of air pollutant emissions broken down by region and the establishment of a computer inquiry system. It has been promoting the Clean Air Policy Support System (CAPSS), and has assisted national and local governments and related institutions in policy making and research.

So far, transportation has been regarded as a major factor leading the country's growth, but recently, it has been recognized as a deterrent to the country's growth. In particular, since automobiles are the main source of air pollution, mobile emissions are a major management target. However, the exhaust gas emissions calculated and provided by the CAPSS have a problem of inaccuracy due to the limitation of using rough information.

The air quality improvement policy is determined according to the calculated exhaust gas emissions, and since a large budget is invested in implementing the policy, reliable information is required for calculating the exhaust gas emissions. The background technology of the present invention is disclosed in Korean Unexamined Patent Publication No. 2011-0078352 (published Jul. 07, 2011).

The technical problem to be solved by the present invention is to provide an apparatus for calculating the exhaust gas emissions and the method of calculating the exhaust gas emissions by determining whether the measured data and the estimated data in the road section error.

Exhaust gas emission calculation apparatus according to an embodiment of the present invention, the measurement data acquisition unit for obtaining the measurement data including the traffic volume or traffic speed for each vehicle type measured for a plurality of road sections, and estimated for the plurality of road sections An estimated data obtaining unit for obtaining estimated data including at least one of a predetermined road length, a traffic volume of each vehicle, and a traveling speed, and an exhaust gas amount for calculating an exhaust gas amount for a target road section using the measured data and the estimated data; It includes an operation unit.

In addition, when the measurement data for the target road section exists, the exhaust gas emission calculator may compare the change rate of the measurement data for the target road section with the change rate of the measurement data for the neighboring road section within a preset area. When the deviation is out of a preset error range, the measurement data for the target road section may be corrected.

The exhaust gas emission calculator may calculate the exhaust gas emission by using the estimated data when the measurement data for the target road section does not exist.

The exhaust gas emission calculator may calculate the exhaust gas emission amount for the target road section at a predetermined time period, but if there is no measurement data of the current time period, the predetermined time period and the previous time period may be obtained. The emission rate can be calculated using the rate of change of the measured data for the neighboring road segments in the area and the measured data obtained in the previous time period.

The exhaust gas emission calculator may match a plurality of road sections obtained by the measurement data and a plurality of road sections obtained by the estimation data to road sections having a predetermined size.

In addition, the maximum or minimum value of the error range ER ₁ may be obtained using the following equation:

은 기 설정된 영역 내의 이웃 도로구간(i±10)에 대한 측정 데이터(mt_{i ±10})의 변화율, k는 특성값을 나타낸다.here,

Is the rate of change of the measurement data (mt _{i ± 10} ) with respect to the neighboring road section (i ± 10) in the preset area, and k is a characteristic value.

In addition, when correcting the measurement data, the measurement data may be multiplied by the geometric mean value of the rate of change of the estimated data to generate correction data.

In addition, the maximum value or the minimum value of the correction range ER ₂ for the measurement data may be obtained using the following equation:

는 도로구간(i)에 대한 추정 데이터, dt_ib는 상기 기 설정된 영역 내의 이웃 도로구간(ib)에 대한 측정 데이터,

는 상기 기 설정된 영역 내의 이웃 도로구간(ib)에 대한 추정 데이터를 나타낸다.here,

Is estimated data for road segment i, dt _ib is measured data for neighboring road segment _ib in the preset area,

Denotes estimated data for a neighboring road section ib in the preset area.

)는 다음의 수학식을 이용하여 구할 수 있다:In addition, the estimated data (

) Can be found using the following equation:

Here, c _i is the maximum allowable value for the traffic volume or the speed of the target road section (i), dt _ib is the measurement data for the neighboring road section (ib) in the preset area, c _ib is the neighboring road section (ib) The maximum allowable value for the traffic volume or speed of each vehicle is shown.

In accordance with another aspect of the present invention, there is provided a method for calculating an exhaust gas amount, including: obtaining measurement data including traffic volume or speed of each vehicle measured for a plurality of road sections, and roads estimated for the plurality of road sections; Obtaining estimated data including at least one of a length, a traffic volume, and a speed of each vehicle; and calculating exhaust gas emissions for a target road segment using the measured data and the estimated data.

Accordingly, it is possible to obtain more accurate exhaust gas emissions by calculating the exhaust gas emissions by determining whether the measured data and the estimated data are in error.

1 is a block diagram of an exhaust gas emission calculation device according to an embodiment of the present invention,
2 is a flowchart illustrating a method for calculating an exhaust gas amount of the apparatus for calculating an exhaust gas amount of FIG. 1;
FIG. 3 is an exemplary diagram for describing searching for a neighboring road section with respect to a target road section in the exhaust gas emission calculation device according to FIG. 1;
FIG. 4 is an exemplary diagram for describing whether or not an error of data used in the exhaust gas emission calculator according to FIG. 1 occurs.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms used are terms recognized in consideration of functions in the embodiments, and the meaning of the terms may vary depending on the intention or precedent of the user or operator. Therefore, the meaning of the terms used in the following embodiments is defined according to the definition when specifically defined in this specification, and unless otherwise defined, it should be interpreted in a sense generally recognized by those skilled in the art.

1 is a configuration diagram of an exhaust gas emission calculating device according to an embodiment of the present invention, and FIG. 2 is a flowchart for explaining a method for calculating an exhaust gas emission amount of the exhaust gas emission calculating device according to FIG. 1.

1 and 2, the exhaust gas emission calculation apparatus 100 according to an embodiment of the present invention may include a measurement data acquisition unit 110, an estimated data acquisition unit 120, and an exhaust gas emission calculation unit 130. Include.

First, the measurement data acquisition unit 110 obtains measurement data including the traffic volume or the speed of each vehicle measured for a plurality of road sections (S200). In this case, the plurality of road sections are a high speed highway and a general national highway. It is a concept including all cities, metropolitan cities, provinces, provinces, archipelagos, and districts, and a plurality of road sections can be set using a predetermined length or distance between intersections. The measurement data includes traffic volume information or traffic speed information of the vehicle collected using an image device or various measurement sensors installed on the target road, and is stored in the DB 115.

In this case, the traffic volume for each vehicle type among the measurement data includes coordinate information of the corresponding road section and information on the number of vehicles passing within a preset time period. For example, the measurement data acquisition unit 110 may obtain traffic information for each vehicle type classified as a passenger car, a small bus, a medium bus, a large bus, a small cargo, a medium cargo, and a large cargo at a plurality of road sections at an hourly interval. have. In this case, the classification of the transportation means may be set differently according to the exhaust gas emission coefficient information for each vehicle type.

On the other hand, the travel speed of the measurement data includes the coordinate information of the road section and the speed information of the vehicle passing within the predetermined time period. For example, the measurement data acquisition unit 110 may calculate the traveling speed of the vehicle by using a speed measuring device installed at a traffic light of a plurality of road sections at an interval of 1 hour. In this case, the traveling speed of the entire vehicle can be calculated by selecting one reference vehicle among a plurality of vehicles passing through the corresponding road section and measuring the speed of the vehicle.

In addition, the measurement data acquisition unit 110 is an advanced traffic information system (ATIS), a traffic monitoring system (TMS), a vehicle detector system (Vehicle Detector System, VDS), and traffic and travel The measurement data may be obtained from any one of an information service (Transport Protocol Expert Group, TPEG) and stored in the DB 115.

Next, the estimation data obtaining unit 120 obtains estimation data including at least one of the estimated road length, traffic volume and traffic speed for the plurality of road sections (S201). In this case, the estimation data acquisition unit 120 may obtain estimation data from a traffic demand forecasting system (TDFS) and store the estimation data in the DB 115. Estimated data may include data for estimating road length, traffic volume, and traffic speed for road sections not included in the measurement data.

Next, the exhaust gas emission calculation unit 130 determines whether there is measurement data for the target road section (S202). In this case, when any one of the information about the traffic volume or the speed of each vehicle among the measurement data is missing, it can be determined that the measurement data does not exist. The exhaust gas emission calculation unit 130 calculates the exhaust gas emission based on measurement data which is measurement information, and may use the estimated data when the measurement information does not exist.

Next, in the case where the measurement data for the target road section exists in step S202, it is determined whether the measurement data satisfies the error range (S203). This is to determine whether there is an error in the measured data obtained in order to calculate more accurate exhaust gas emissions. Specifically, the exhaust gas emission calculator 130 determines whether the preset error range is satisfied by comparing the change rate of the measurement data for the target road section with the change rate of the measurement data for the road section within the preset area. Here, the description of the neighboring road section in the preset area will be described later with reference to FIG. 3.

FIG. 3 is an exemplary diagram for describing a search for a neighboring road section with respect to a target road section in the exhaust gas emission calculation apparatus according to FIG. 1.

Referring to FIG. 3, at least one neighboring road section 302 neighboring the target road section 301 is present in the neighboring road section 302 search area, which is a preset area for the target road section 301. The road section 301 and the road width, the road length, etc. may be set to similar road sections. The measured data or the estimated data for the neighboring road section 302 may be used to determine whether the data for the target road section 301 is an error or to replace the measured data to calculate the exhaust gas emissions.

In addition, the neighboring road section 302 may be set to a road section similar in traffic flow to the target road section 301. In addition, the neighboring road section 302 may be set differently in consideration of the signal system of the target road section 301 and whether the vehicle is restricted in the traveling direction. For example, when the target road section 301 is a road with two lanes one-way, and the left turn signal is a road with a signal, the left road and the signal among the roads that are two-way one-way among the road sections in the neighboring road section search area 303 are displayed. A road capable of making a U-turn may be set as the neighboring road section 302. The neighbor road section 302 information may be classified in advance according to the characteristics of the target road section 301.

)을 구할 수 있다.Referring back to FIGS. 1 and 2, in operation S203, the exhaust gas emission calculation unit 130 obtains a measurement data change rate (mt _i %) for a target road section by using Equation 1 below, and Equation 2 below. Change rate of measured data for neighboring road sections within a preset area using

) Can be obtained.

In Equation 1, mt _b represents measurement data in a previous time period of the target road section i, and mt _n represents measurement data in a current time period of the target road section i.

는 이웃 도로구간(i±10)에서의 측정 데이터 변화율, mt_b는 이웃 도로구간(i±10)의 이전시간 주기에서의 측정 데이터, mt_n은 이웃 도로구간(i±10)의 현재시간 주기에서의 측정 데이터를 나타낸다.In Equation (2)

Is the rate of change of the measured data in the neighboring road segment (i ± 10), mt _b is the measured data in the previous time period of the neighboring road segment (i ± 10), and mt _n is the current time period in the neighboring road segment (i ± 10) The measurement data in is shown.

In addition, the exhaust gas emission calculator 130 may obtain the maximum value or the minimum value of the error range ER ₁ with respect to the measurement data by using Equation 3 below.

은 이웃 도로구간(i±10)에서 측정 데이터(mt_{i ±10})의 변화율, k는 특성값을 나타낸다.In Equation (3)

Is the rate of change of the measured data (mt _{i ± 10} ) in the neighboring road section (i ± 10), k is a characteristic value.

Next, when it is determined in step S203 that the measurement data satisfies the error range, the exhaust gas emission calculator 130 calculates the exhaust gas emissions (S204). The exhaust gas emission calculator 130 may calculate the exhaust gas emissions E _{i and e} using Equation 4 below.

In Equation 4, L is the length of the target road section (i), T is the traffic volume by car type (k) of the target road section (i), EF is the exhaust gas emission coefficient, v is the travel speed of the target road section (i) Indicates.

로 나타낼 수 있다.On the other hand, the exhaust gas emission calculation unit 130 corrects the measurement data when it is determined in step S203 that the measurement data is out of the error range (S205). In detail, the exhaust gas emission calculator 130 may generate correction data by multiplying the measurement data for the target road segment by the geometric mean value of the rate of change of the estimated data. Therefore, the correction value mt _i 'of the measurement data mt _i for the target road segment is mt _i ' = mt _i ×

.

In this case, the maximum value or the minimum value of the correction range ER ₂ with respect to the correction value of the measurement data for the target road section can be obtained using Equation 5 below.

는 대상 도로구간(i)에 대한 추정 데이터, dt_ib는 기 설정된 영역 내의 이웃 도로구간(ib)에 대한 측정 데이터,

는 기 설정된 영역 내의 이웃 도로구간(ib)에 대한 추정 데이터를 나타낸다. 이 경우, 배기가스 배출량 연산부(130)는 측정 데이터가 획득된 복수의 도로구간과 추정 데이터가 획득된 복수의 도로구간이 서로 일치하지 않는 경우, 각 도로구간을 기 설정된 크기의 도로구간으로 분할하고, 식별번호를 부여하여 측정 데이터의 도로구간과 추정 데이터의 도로구간을 서로 매칭시킬 수 있다.In Equation (5)

Is the estimated data for the target road segment i, dt _ib is the measured data for the neighboring road segment _ib in the preset area,

Denotes estimated data for neighboring road sections ib in a preset area. In this case, when the plurality of road sections from which measurement data is obtained and the plurality of road sections from which estimation data is obtained do not coincide with each other, the exhaust gas emission calculator 130 divides each road section into road sections having a predetermined size. By assigning an identification number, the road section of the measured data and the road section of the estimated data can be matched with each other.

)는 다음의 수학식 6을 이용하여 구할 수 있다.On the other hand, the estimated data for the target road section (i)

) Can be obtained using Equation 6 below.

In Equation 6, c _i is the maximum allowable value for the traffic volume or speed of the target road section (i), dt _ib is the measurement data for the neighboring road section (ib) in the preset area, c _ib is the neighboring road section ( ib) shows the maximum allowable value for the traffic volume or speed of each vehicle. As described above, the exhaust gas emission calculator 130 may calculate the exhaust gas emission by correcting the measurement data.

On the other hand, when it is determined in step S202 that the measurement data for the target road section does not exist, the exhaust gas emission calculator 130 determines whether the measurement data for the previous time period exists (S206). The exhaust gas emission calculation for the target road segment may be calculated at predetermined time periods. In this case, when the measurement data corresponding to the current time period for the target road section does not exist, the measurement data corresponding to the previous time period for the target road section may be used. A description of the case where the measurement data for the target road section does not exist will be described in detail with reference to FIG. 4.

FIG. 4 is an exemplary diagram for describing whether or not an error of data used in the exhaust gas emission calculator according to FIG. 1 occurs.

Referring to FIG. 4, (A) a graph is a measurement data graph according to a time period for a target road section, and (B) a graph is a measurement data graph according to a time period for a neighboring road section. Ⓐ represents the current time period, ⓑ represents the previous time period, and ⓒ represents the current time period for the neighboring road section. In this case, when the measurement data of the current time period (ⓐ) does not exist among the measurement data for the target road section, or is significantly less than the measurement data of the previous time period (ⓑ), the measurement data of the previous time period (ⓑ). And the measurement data in the current time period ⓒ for the neighboring road section can be used. In this case, when there are a plurality of neighboring road sections, the average value of the measurement data for each neighboring road section can be used.

)를 구할 수 있다.Referring back to FIGS. 1 and 2, when the measurement data of the previous time period for the target road section exists in step S206, the exhaust gas emission calculator 130 obtains a preset area acquired in the current time period and the previous time period. Measurement data corrected as shown in Equation 7 using the rate of change of the measurement data for the neighboring road section and the measurement data obtained in the previous time period (

) Can be obtained.

In Equation 7, mt _{i , b} is measurement data in the previous time period of the target road segment (i), mt _{i ± 10, n} is the measurement data in the current time period of the neighboring road segment (i ± 10), mt _{i ± 10, b} represents the measurement data in the current time period of neighboring road sections.

On the other hand, if the measurement data of the previous time period does not exist, the exhaust gas emission calculation unit 130 determines whether the estimated data satisfy the preset error range (S207). This is to determine whether the estimated data is error before calculating the exhaust gas emissions using the estimated data. Equation 5 and Equation 6 described above may be used as whether the error range of the estimated data for the target road section is satisfied. If the estimated data satisfies the preset error range, the exhaust gas calculating unit 130 processes the step S205.

)의 보정값(

)은

로 나타낼 수 있다. 이는 앞서 설명한 측정 데이터의 보정값(mt_i')과 같은 방식으로 구할 수 있다. 배기가스 배출량 연산부(130)는 보정된 추정 데이터를 이용하여 배기가스 배출량을 연산할 수 있다.
Meanwhile, when the estimated data does not satisfy the preset error range in step S207, the exhaust gas emission calculator 130 corrects the estimated data (S208). In detail, the exhaust gas emission calculator 130 may correct the estimated data for the target road segment by multiplying the geometric mean value of the rate of change of the estimated data for the neighboring road segment. Therefore, the estimated data for the target road segment (

) Correction value (

)silver

. This can be obtained in the same manner as the correction value mt _i 'of the measurement data described above. The exhaust gas emission calculator 130 may calculate the exhaust gas emission by using the corrected estimated data.

Meanwhile, embodiments of the present invention can be implemented by computer readable codes on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored.

Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device and the like, and also a carrier wave (for example, transmission via the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. And functional programs, codes, and code segments for implementing the present invention can be easily deduced by programmers skilled in the art to which the present invention pertains.

As described above, the apparatus for calculating the exhaust gas amount according to the embodiment of the present invention may obtain more accurate exhaust gas amount by calculating the amount of exhaust gas by determining whether the measured data and the estimated data are in error.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, Therefore, the present invention should be construed as a description of the claims which are intended to cover obvious variations that can be derived from the described embodiments.

100: exhaust gas emission calculation device
110: measurement data acquisition unit
115: DB
120: estimated data acquisition unit
130: exhaust gas emission calculation unit
301: target road section
302: neighboring road segments
303: neighboring road section search area

Claims (14)

A measurement data acquisition unit for obtaining measurement data including a traffic volume or a traffic speed of each vehicle model measured for a plurality of road sections;
An estimation data acquisition unit for obtaining estimation data including at least one of an estimated road length, a traffic volume for each vehicle type, and a traveling speed for the plurality of road sections; And
And an exhaust gas emission calculator configured to calculate an exhaust gas emission amount for a target road section using the measured data and the estimated data. The method of claim 1,
The exhaust gas emission calculation unit,
When the measurement data for the target road segment exists, the rate of change of the measurement data for the target road segment is compared with the rate of change of the measurement data for the neighboring road segment in a preset area, and is out of the preset error range. Exhaust emission calculation device that corrects the measurement data for the target road segment. The method of claim 1,
The exhaust gas emission calculation unit,
And exhaust gas emissions calculation device using the estimated data when the measurement data for the target road section does not exist. The method of claim 1,
The exhaust gas emission calculation unit,
Calculate the exhaust gas emissions for the target road section at a preset time period, but if there is no measurement data for the current time period, the measurement data for the neighboring road sections in the preset area obtained in the current time period and the previous time period. Exhaust gas emission calculation device that calculates the exhaust gas emission rate using the rate of change and measured data obtained in the previous time period. The method of claim 1,
The exhaust gas emission calculation unit,
And a plurality of road sections in which the measurement data is obtained and a plurality of road sections in which the estimated data are obtained are matched with road sections having a predetermined size. 3. The method of claim 2,
Exhaust gas emission calculation device for calculating the maximum value or the minimum value of the error range (ER ₁ ) using the following equation:

here,

Is the rate of change of the measurement data (mt _{i ± 10} ) with respect to the neighboring road section (i ± 10) in the preset area, and k is a characteristic value. 3. The method of claim 2,
And correcting the measurement data to generate correction data by multiplying the measurement data with a geometric mean value of the rate of change of the estimated data. 3. The method of claim 2,
Exhaust gas emission calculation device for calculating the maximum value or the minimum value of the correction range (ER ₂ ) for the measured data using the following equation:

here,

Is estimated data for road segment i, dt _ib is measured data for neighboring road segment _ib in the preset area,

Denotes estimated data for a neighboring road section ib in the preset area. 9. The method of claim 8,
The estimated data (

) Is calculated by using the following equation:

Here, c _i is the maximum allowable value for the traffic volume or the speed of the target road section (i), dt _ib is the measurement data for the neighboring road section (ib) in the preset area, c _ib is the neighboring road section (ib) The maximum allowable value for the traffic volume or speed of each vehicle is shown. In the calculation method of the exhaust gas emission calculating device,
Acquiring measurement data including traffic volume or speed of each vehicle measured for the plurality of road sections;
Obtaining estimation data including at least one of estimated road lengths, traffic volume and traffic speeds for the plurality of road sections; And
Computing the exhaust gas emissions for the target road section using the measured data and the estimated data. 11. The method of claim 10,
Computing the exhaust gas emissions,
When the measurement data for the target road segment exists, the rate of change of the measurement data for the target road segment is compared with the rate of change of the measurement data for the neighboring road segment in a preset area, and is out of the preset error range. Exhaust emission calculation method that corrects measurement data for a target road segment. 12. The method of claim 11,
An exhaust gas emission calculation method for calculating a maximum value or a minimum value of the error range ER ₁ using the following equation:

here,

Is the rate of change of the measurement data (mt _{i ± 10} ) with respect to the neighboring road section (i ± 10) in the preset area, and k is a characteristic value. 12. The method of claim 11,
An exhaust gas emission calculation method for calculating a maximum value or a minimum value of the correction range ER ₂ for the measurement data by using the following equation:

here,

Is estimated data for road segment i, dt _ib is measured data for neighboring road segment _ib in the preset area,

Denotes estimated data for a neighboring road section ib in the preset area. 14. The method of claim 13,
The estimated data (

) Is calculated using the following equation:

Here, c _i is the maximum allowable value for the traffic volume or the speed of the target road section (i), dt _ib is the measurement data for the neighboring road section (ib) in the preset area, c _ib is the neighboring road section (ib) The maximum allowable value for the traffic volume or speed of each vehicle is shown.

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