JP2001291185A - Measuring system, its method and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the exhaust gas of an automobile traveling on a road having a plurality of lanes. SOLUTION: A light projecting part 3 emits a light consisting of infrared rays and ultraviolet rays toward a light receiving part 4. When an automobile 2A traveling on lane A or an automobile 2B traveling on a lane B shields the light and the light is received again, exhaust gas discharged from the automobiles 2A and 2B is analyzed by a personal computer 5. The personal computer 5 decides which one of the automobiles 2A and 2B discharges more toxic substances.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring system and method, and a recording medium, and more particularly to a measuring system and method capable of detecting exhaust gas of a vehicle traveling on a road having a plurality of lanes. It relates to a recording medium.

[0002]

An automobile is widespread, there recently, CO contained in the exhaust gas discharged during the traveling, HC, NO, while a state in which harmful substances are not negligible influence on the human body, such as NO _2. Accordingly, sensors for measuring these exhaust gases have been commercialized, for example, under the name of Remote Sensing Device (RSD) (trademark), and are being used in the United States and Asian countries.

[0003]

This remote sensing device irradiates light from one side of the road to the other side across the road, and emits light reflected by a mirror provided on the opposite side of the road. The light is received and the pollutants in the air are measured immediately after the vehicle passes. Therefore, when a plurality of vehicles pass near the measuring device almost at the same time, it is not possible to determine which exhaust gas of the plurality of vehicles contained a harmful substance, and after all, a plurality of lanes were formed. There is a problem that it is not possible to use a remote sensing device on a road having such a road.

[0004] The present invention has been made in view of such a situation, and enables measurement of exhaust gas of a plurality of vehicles passing through each lane even on a road having a plurality of lanes. Is what you do.

[0005]

A first measuring system according to the present invention receives light emitted so as to cross a space on a traveling road having a plurality of lanes, and emits exhaust gas emitted by a vehicle traveling in the lane. Exhaust gas detection means for detecting gas, and at the timing when the exhaust gas detection means detected the exhaust gas,
Vehicle detection means for detecting a plurality of vehicles traveling in each of a plurality of lanes; detection results of the plurality of vehicles by the vehicle detection means and detection results by the exhaust gas detection means at a timing when the exhaust gas detection means detects the exhaust gas And storage means for storing the corresponding information.

The exhaust gas detecting means is constituted by, for example, an exhaust gas measuring section 31 shown in FIG. The travel path is
For example, it means the road 1 shown in FIG. 1, and the light crossing the space means, for example, the light 6 emitted from the light projecting unit 3 to the light receiving unit 4 shown in FIG. The plurality of lanes means, for example, the lane A and the lane B of the road 1 as shown in FIG. 2, but it is needless to say that three or more lanes may be used.

A vehicle is, for example, an automobile 2 shown in FIG.
A, 2B. The exhaust gas detecting means detects exhaust gas emitted from the automobiles 2A and 2B.

As a method of detecting exhaust gas, for example, a method disclosed in US Pat. No. 5,319,199 can be used.

In this detection method, infrared light and ultraviolet light are emitted from the light projecting unit 3 to the light receiving unit 4 and
The light received at is divided. The received light output is filtered by a filter matching the characteristics of the measurement substance, and the concentration of the measurement substance existing in the measurement space is determined from the degree of light absorption in the measurement space.

For example, the substances to be measured are HC, CO, CO_Two, NOx and
Is done. Each measured value V_CO, V _HC, V_NOXIs like
For example, CO_TwoBy dividing by the measured value of
V_CO2Mixing ratio value Q₁, Q_Two, Q_ThreeIs converted to

[0011] _{Q1 = V CO / V CO2 Q2} = V HC / V CO2 Q3 = V NOX / V CO2

As described above, by obtaining the mixing ratio of each harmful substance having CO ₂ as a denominator, it is possible to measure the exhaust gas with a numerical value that is less affected by diffusion in the air.

The timing at which the exhaust gas detecting means detects the exhaust gas means, for example, that after the automobiles 2A and 2B shown in FIG. 1 block the light 6 emitted from the light projecting unit 3 toward the light receiving unit 4, It can be when the blockage is released. Exhaust gas measurement can be completed in about 0.7 seconds,
The time point when the measurement is completed may be the timing when the exhaust gas is detected.

The vehicle detecting means includes, for example, the plate checking cameras C _{N1A to} C _N2B and the position detecting camera C in FIG.
_{It comprises D1A to} C _D2B , a plate number reading unit 33 for processing the output, and a calculation unit 32. The plate checking cameras C _{N1A to} C _N2B are provided for each lane, capture an image of a license plate of a vehicle traveling in each lane in the upward direction or the downward direction, and perform image processing on the captured image in the plate number reading unit 33. Thereby, the plate number engraved on the license plate is read.

The position detection cameras C _{D1A to} C _D2B capture images of the vehicles 2A and 2B traveling in each lane, and process the captured images by the arithmetic unit 32.
As the positions of A and 2B, for example, distances from the reference line L to the cars 2A and 2B are measured. When this position is equal to or less than the predetermined threshold, the detection result by the exhaust gas detection means can be estimated to correspond to the detected vehicle.

The calculation unit 32 also has a position detection camera _CD1A.
Or the difference between the position of the vehicle C _D2B is captured in each of the successive frames outputted by imaging, by dividing the time corresponding to the period between the frame, the rate at which the car is traveling Is calculated. Further, the operation unit 32
Calculates the difference between the speed obtained between the image of the first frame and the image of the second frame and the speed obtained between the image of the second frame and the image of the third frame by the first By dividing by the time between the image of the frame and the image of the second frame, the acceleration of the vehicle is calculated.

The storage means is constituted by, for example, the database 35 in FIG. The detection results by the vehicle detection means stored in the database 35 include, for example,
As shown in FIG. 14, the plate number, the position, the speed, the acceleration, the plate number of the simultaneous measurement target vehicle, the speed of the simultaneous measurement target vehicle, the acceleration of the simultaneous measurement target vehicle, and the distance D of each vehicle
_GAP is included, and the detection result by the exhaust gas detection means includes:
For example, as shown in FIG. 14, a measurement date and time, an exhaust gas measurement value, and the like are included.

A vehicle traveling in each of a plurality of lanes includes
A determination means for determining whether or not the detection result by the exhaust gas detection means can be applied can be further provided.

This determining means is constituted by, for example, the control section 34 shown in FIG. 3 for executing the measurement value processing shown in FIG. The control unit 34 compares the measured value E ₁ of the exhaust gas with a predetermined reference value E _R in step S42 of FIG.
_{If 1} is smaller than the reference value E _R, when a plurality of target vehicles are detected, it is assumed that the measurement result can be applied to any of the target vehicles, and that all the target vehicles are in a good condition. It is determined that there is.

If the measured value E ₁ is larger than the reference value E _R, it is determined in step S 4 whether or not there is a vehicle to be simultaneously measured.
If it is determined in step S4 that the vehicle is present, it is determined in step S46 whether or not the state of the simultaneous measurement target vehicle is registered in the database 35. If the state of the simultaneous measurement target vehicle is registered as good, it is determined whether the determination target vehicle has a value close to the value of the measurement result within one month from the current date and time. If the measured value E ₁
The but exceeds the reference value E _R as the determination target vehicle is caused, measurement results, be applied in the determination target vehicle is registered in step S45 the database 35 the state of the determination target vehicle as faulty.

In this way, even when a plurality of vehicles are running, the measurement results can be applied in the same manner as when exhaust gas of one vehicle is measured.

The light generating means for generating light is constituted by, for example, the light projecting section 3 of FIG. 1, and the light receiving means for receiving the light is constituted by, for example, the light receiving section 4 of FIG. In FIG. 1, the light receiving unit 4 is disposed on the opposite side of the light emitting unit 3 across the road 1. By arranging the mirror at the position where the light receiving unit 4 of FIG. 1 is arranged, the light receiving unit 4 can be arranged on the same side as the light emitting unit 3. However, if a mirror is arranged, light from the headlights of the vehicle may be reflected, which may obstruct traffic. Therefore, the light receiving unit 4 is arranged on the opposite side of the light emitting unit 3 with respect to the road 1. Is preferred.

According to the first measurement system of the present invention, a plurality of vehicles traveling in each of a plurality of lanes at the timing when exhaust gas is detected are detected and stored in correspondence with the exhaust gas inspection results. Therefore, even when a plurality of vehicles travel on the traveling road, it is possible to determine whether or not the detection result of each exhaust gas is applicable to the vehicle.

In the case where a vehicle to be associated with the inspection result by the exhaust gas detection means is determined among a plurality of vehicles traveling on each of the plurality of vehicles based on the inspection result of the vehicle detection means, It is possible to manage the exhaust gas of each of a plurality of vehicles traveling on a traveling road having a lane.

[0025] A second measurement system of the present invention receives an emitted light so as to cross a space on a traveling road having a plurality of lanes, and detects exhaust gas emitted by a vehicle traveling on the lane. Detecting means for detecting a plurality of vehicle positions traveling on each of the plurality of lanes at a timing when the exhaust gas detecting means detects the exhaust gas, and detecting a result of the exhaust gas detecting means within a predetermined period. Storage means for storing based on the result of the detection.

Also in this case, the exhaust gas detecting means is constituted by, for example, the exhaust gas measuring section 31 in FIG. 3, and the vehicle detecting means is, for example, the plate checking cameras C _{N1A to} C _N2B and the position detecting camera C _{D2B in FIG.} , A plate number reading unit 33 and an arithmetic unit 3 that process the output
It consists of two. The storage means is constituted by, for example, the database 35 in FIG.

The predetermined period can be, for example, one month.

In the second measuring system of the present invention, the detection result by the exhaust gas detecting means is stored based on the detection result within a predetermined period.

As a result, it is possible to effectively utilize the current measurement result without wasting it and determine the state of the vehicle.

A third measuring system according to the present invention receives an emitted light so as to cross a space on a traveling road having a plurality of lanes, and detects exhaust gas emitted by a vehicle traveling on the lane. Detecting means, vehicle detecting means for detecting vehicles traveling on each lane, vehicle characteristic detecting means for detecting characteristics of vehicles traveling on each lane, and when the vehicle detecting means detects only one vehicle, Lane information of the detected vehicle,
A storage means for storing the detected characteristics of the vehicle and the detected exhaust gas amount is provided.

Also in the third measuring system of the present invention, the exhaust gas detecting means is constituted by, for example, the exhaust gas measuring section 31 shown in FIG. 3, and the vehicle detecting means is constituted by, for example, the position detecting cameras C _{D1A to} C _{D1A to} C FIG. _D2B and an operation unit 32 for processing the output thereof. The vehicle characteristic detecting means is constituted by, for example, the plate confirmation cameras C _{N1A to} C _N2B in FIG. 3 and a plate number reading unit 33 for processing the output, and is stored. The means is constituted by, for example, the database 35 in FIG.

In the third measuring system according to the present invention, when only one vehicle is detected, lane information and characteristics of the vehicle and the detected exhaust gas amount are stored.

Thus, even when only one vehicle is detected, for example, it is possible to identify whether the vehicle is on the up lane or the down lane, and apply the measured value of the detected exhaust gas. Become.

[0034] A fourth measurement system of the present invention receives an emitted light so as to cross a space on a traveling road having a plurality of lanes, and detects exhaust gas emitted by a vehicle traveling on the lane. Detecting means, determining means for determining whether the amount of exhaust gas detected by the exhaust gas detecting means satisfies a predetermined criterion, vehicle detecting means for detecting a vehicle traveling on each lane, A vehicle characteristic detecting means for detecting characteristics of the traveling vehicle, and a vehicle detecting means for detecting the vehicle in two or more lanes and determining that the detected exhaust gas amount satisfies a predetermined standard. And storage means for storing the determination result.

In the fourth measuring system of the present invention,
The exhaust gas detecting means is, for example, the exhaust gas shown in FIG.
It is measured by the measuring unit 31 and the determination means is, for example, as shown in FIG.
The vehicle detection means is configured by the control unit 34, for example,
Position detection camera C in FIG. _D1AOr C_D2B, And that
And an operation unit 32 for processing the output of the vehicle.
The means is, for example, the plate checking camera C in FIG._N1A
Or C_N2B, And plate number reading to process its output
The storage unit is configured by, for example, the storage unit 33 shown in FIG.
It is constituted by a database 35.

In the fourth measuring system according to the present invention, when a vehicle is detected in two or more lanes and it is determined that the exhaust gas amount of the detected vehicle satisfies a predetermined reference value, the characteristic of the detected vehicle , And the determination result are stored.

Thus, when the determination result of the exhaust gas of two or more vehicles is good, it is possible to apply the measurement result to the vehicle and determine that the vehicle is in a good state.

[0038]

FIG. 1 shows a use state of a measurement system to which the present invention is applied. As shown in the figure,
In this measurement system, a light projecting unit 3 is arranged on one side of a road 1 having a lane A and a lane B, and a light receiving unit 4 is arranged on the other side. The light projecting unit 3 and the light receiving unit 4 are arranged on a virtual reference line L substantially perpendicular to the traveling direction of the automobile on the road 1. The light 6 emitted from the light projecting unit 3 is received by the light receiving unit 4.
When the vehicle 2A travels on the lane A of the road 1 and the vehicle 2B travels on the lane B, exhaust gas is emitted from each of the vehicles 2A and 2B. The absorptance of light emitted from the light projecting unit 3 toward the light receiving unit 4 varies depending on the substance contained in the exhaust gas. The substance contained in the exhaust gas is detected by analyzing the light absorptance by the personal computer 5 connected to the light projecting unit 3 and the light receiving unit 4.

Although not shown in FIG. 1, as shown in FIG. 2, around the light projecting unit 3 and the light receiving unit 4, the position detecting cameras C _{D1A to} C _D2B composed of video cameras and the plate confirmation Cameras C _{N1A to} C _N2B are arranged. The position detection cameras C _{D1A to} C _D1B capture an image used to detect the position of the car traveling on the road 1 and the speed and acceleration of the car. The position detection camera _{CD1A captures an} image of the lane A on the road 1 at a predetermined timing when the vehicle traveling from left to right in FIG. At that timing, the plate checking camera _CN1A captures the license plate of the vehicle from behind the vehicle.

When a car travels in the lane A on the road 1 from right to left, the position detection camera _CD2A captures an image of the car at a predetermined timing beyond the reference line L, and the number of the car is The plate is imaged by the plate checking camera _CN2A .

Similarly, when the vehicle travels in the lane B of the road 1 from right to left, the position detection camera _CD2B takes an image of the vehicle from behind at a predetermined timing when the vehicle crosses the reference line L. And plate confirmation camera C
_N2B images the license plate of the car.

When the vehicle travels in the lane B of the road 1 from left to right, the position detection camera C _D1B transmits the reference line L
The image of the vehicle at a predetermined timing beyond the vehicle is _captured from behind, and the plate checking camera _CN1B images the license plate of the vehicle.

Therefore, for example, when the road 1 is left-hand traffic and face-to-face traffic, only the position detection camera C _D1A and the plate confirmation camera C _N1A , and only the position detection camera C _D2B and the plate confirmation camera C _N2B are provided. can do.

Conversely, when the traffic is right-handed,
Only the position detection camera C _D2A and the plate confirmation camera C _N2A , and only the position detection camera C _D1B and the plate confirmation camera C _N1B can be provided.

For example, when the vehicle travels from the left to the right in both the lanes A and B of the road 1,
A position detection camera C _D1A and a plate confirmation camera C _N1A , and a position detection camera C _D1B and a plate confirmation camera C _N1B are provided. When a car travels in lanes A and B from right to left, a position detection camera is provided. C _D2A and plate check camera C _N2A, and can be made to provide a position detection camera C _D2B and plate confirmed the camera C _N2B.

Of course, in any case, all the video cameras may be arranged as necessary so that the automobile can be imaged from the front.

FIG. 3 shows a basic configuration example of the measurement system 21 of the present invention. The exhaust gas measuring unit 31 controls the light projecting unit 3 to generate infrared rays and ultraviolet rays. Light receiving section 4
Receives and separates the infrared light and the ultraviolet light emitted by the light projecting unit 3, and converts the photoelectric conversion output thereof into a measurement substance (for example, HC, C
O, CO ₂ , NOx)
A signal having a level corresponding to absorption of infrared rays and ultraviolet rays in a measurement space (a space between the light projecting unit 3 and the light receiving unit 4) is output to the exhaust gas measuring unit 31. The exhaust gas measuring unit 31 measures the mixing ratio of the substance contained in the exhaust gas existing in the measurement space based on the level of the signal output by the light receiving unit 4.

The operation unit 32 controls the position detection cameras C _{D1A to} C _D2B to cause the vehicle to be imaged at a predetermined timing, and to determine the position of the vehicle (the distance from the reference line L of the vehicle) based on the image data output from the cameras. , The lane of the vehicle, the speed and acceleration of the vehicle, and the distance between a plurality of vehicles.

The plate number reading unit 33 controls the plate confirmation cameras C _{N1A to} C _N2B, and at a predetermined timing, picks up an image of the license plate of the vehicle, and from the _captured data, the plate stamped on the license plate of each vehicle. Read the number.

The control unit 34 is constituted by, for example, a CPU and controls the exhaust gas measuring unit 31, the arithmetic unit 32, and the plate number reading unit 33 to execute predetermined processing and output from each. The obtained data is supplied to and stored in the database 35 as needed, and various analysis processes are executed based on the data stored in the database 35.

It should be noted that the exhaust gas measuring section computing section 32, plate number reading section 33, control section 34, and database 35 in FIG. 3 are constituted by the personal computer 5 in FIG.

Next, referring to the flowchart of FIG.
The operation of the measurement system 21 shown in FIG. 3 will be described.
First, in step S <b> 1, the control unit 34 controls the exhaust gas measurement unit 31 to generate infrared rays and ultraviolet rays from the light projecting unit 3. The light 6 including the infrared light and the ultraviolet light is received by the light receiving unit 4 arranged on the opposite side of the light emitting unit 3 across the road 1. When the car is not traveling on the road 1, the light receiving unit 4 can continuously receive the light 6 generated by the light projecting unit 3. On the other hand, when the vehicle 2 travels in the lane A or B on the road 1, the light 6 is blocked by the vehicle traveling. Therefore, the exhaust gas measuring unit 31
Monitors the output of the light receiving unit 4, determines whether the light emitted from the light projecting unit 3 is blocked by the automobile 2, and if not blocked, waits until the light is blocked.

When the vehicle 2 travels in the lane A or B on the road 1, the light 6 emitted from the light projecting unit 3
Is shielded at the timing when passes on the reference line L. When the rear end of the car 2 exceeds the reference line L, the light emitting section 3
The emitted light is received by the light receiving unit 4 again. Therefore, in step S2, the exhaust gas measuring unit 31 monitors the output of the light receiving unit 4 and waits until light is detected again. If the shielded light is detected again, the vehicle 2 has passed the reference line L.

Therefore, at this time, the exhaust gas measuring unit 31 executes an exhaust gas measuring process in step S3. That is, since the vehicle 2 has just passed the lane A or B, the exhaust gas discharged from the vehicle 2 remains on the reference line L (the space where light is irradiated).

For example, it is assumed that the automobile 2 is running on a gasoline engine. Although gasoline is a mixture of benzene and butane, the component can be approximated to almost CH _2. If this gasoline ideally burns completely,
According to the following formula, all C contained in gasoline
Turns into CO ₂ . O ₂ + 4N ₂ means a component of air.

CH ₂ +1.5 (O ₂ + 4N ₂ ) → CO ₂ + H ₂ O + 6N ₂ That is, when complete combustion is performed, no CO is generated (the contained ratio is 0%), and CO ₂ The concentration is 1
4.3 percent.

On the other hand, when incomplete combustion occurs, all C contained in gasoline changes to CO according to the following equation.

CH ₂ + (O ₂ + 4N ₂ ) → CO + H ₂ O + 4N ₂ That is, in this case, no CO ₂ is generated (its concentration is 0%), and the CO concentration is 20%.

In practice, the mechanism of the engine, the fuel components
Complete combustion and incomplete combustion described above due to quality, load, etc.
Combustion during burning takes place in the engine. as a result,
CO and CO _TwoBut the ideal gasoline engine is
As mentioned above, CO_TwoOnly occurs in the exhaust gas because C
If a large amount of O is contained, exhaust that exhaust gas.
The engine you put out is a bad engine
Become.

Depending on the amount of CO ₂ contained in the exhaust gas,
The absorption of infrared and ultraviolet light changes. Therefore, the absorption amounts of the infrared rays and the ultraviolet rays by the CO ₂ can be calculated from the levels of the infrared rays and the ultraviolet rays received by the light receiving section 4.

Similarly, the degree to which infrared rays and ultraviolet rays are absorbed changes depending on the amount of substances such as CO, HC, and NOx contained in the exhaust gas. Therefore, the content contained in these exhaust gases can also be calculated from the light receiving levels of infrared rays and ultraviolet rays received by the light receiving section 4.

As described above, the exhaust gas measuring section 31 first calculates the pollutants such as CO, CO ₂ , HC, and NOx with a value corresponding to the number of moles.

However, these substances diffuse over time after being released. Therefore, the amount (measured value) in the air changes due to the strength of the wind and the like.

Therefore, in the present invention, the exhaust gas measuring section 31 calculates these substances as a ratio Q to CO ₂ . That is, the measured values V _CO , V _HC , V of CO, HC, NOx
_NOX is normalized by the measured value V _CO2 of CO ₂ according to the following equation.

Q1 = _VCO / _VCO2 Q2 = _VHC / _VCO2 Q3 = _VNOx / _VCO2

Even if each substance diffuses, it changes at the same speed, so that the normalized value does not change so much at the timing immediately after being discharged from the vehicle.

As described above, the exhaust gas measuring unit 31 outputs CO,
The concentrations of HC and NOx are calculated as a mixing ratio value for CO ₂ .

The principle of the above measurement is disclosed in US Pat. No. 5,319,199.

As described above, when gasoline (CH ₂ ) is burned (chemical change), CO and CO ₂ are generated.

CO in exhaust gas of C contained in gasoline
Is expressed by the following equation when Q1 (= _VCO / _VCO2 ) is used.

V _CO / (V _CO + V _CO2 ) = Q1 / (Q1 + 1)

According to Hess' law of conservation of mass, the CO emission weight (kg) is expressed by the following equation.

CO emission weight (kg) = 28 (g) × Q1 / 14 (g) × (Q1 + 1) × fuel consumption (kg) = 2Q1 / (Q1 + 1) × fuel consumption (kg)

The specific gravity of gasoline is 0.75 kg / L, and the amount of CO emission when one liter (L) of gasoline is burned is expressed by the following equation.

CO emission (kg) = 2Q1 / (Q1 + 1) × 0.75 (kg / L) × 1 (L) = 1.5Q1 / (Q1 + 1) (kg) Therefore, it is estimated from several measurement data. The average value of Q1 is calculated, and the average value is Q1av.
Then, the total amount (kg) of the exhaust gas to be discharged is represented by the following equation.

Total amount of exhaust gas to be discharged (kg) = 1.5
Q1av / (Q1av + 1) × TL Exhaust gas measurement processing as described above is performed 70 times in 0.7 seconds.
This is performed in the exhaust gas measuring unit 31.

After the process in step S3, the process proceeds to step S4, in which the position detecting camera performs an image of the vehicle 2 immediately after passing the reference line L. In step S5, the license plate of the vehicle is detected by the plate checking camera. Is performed.

Note that the exhaust gas measurement processing in step S3 and the photographing processing by the position detection camera and the plate confirmation camera in steps S4 and S5 do not necessarily need to be performed in this order. In short, it is only necessary to be able to detect a vehicle that has emitted exhaust gas without fail.

That is, when the control unit 34 notifies the exhaust gas measuring unit 31 that the light 6 has been once shielded and then detected again or that the exhaust gas measurement has been completed, the calculating unit 32 And the position detection cameras C _{D1A to} C _{D1A to} C
_{The D2B} captures the image data at that timing from the image data that is captured and output. Further, when a similar timing signal is supplied from the control unit 34, the plate number reading unit 33 captures image data of a frame at that timing from image data output by the plate checking cameras C _{N1A to} C _N2B , The image data is recognized, and the process of reading the number stamped on the license plate is executed.

Next, the process proceeds to step S6, where the control unit 34
Controls the calculation unit 32 and the plate number reading unit 33,
The vehicle identification processing is executed. The details of the vehicle specifying process are shown in the flowchart of FIG.

First, in step S21, the plate number reading section 33 reads the plate confirmation cameras C _{N1A to} C _N2B.
, It is determined whether or not the number of read license plates is one. For example, as shown in FIG.
When the car 2A is traveling in the lane A of the road 1 from left to right, only by the plate checking camera _CN1A ,
The license plate is imaged, and the license plate is not imaged by the other plate confirmation cameras C _N2A , C _N1B , and C _N2B .

Conversely, as shown in FIG. 7, when the automobile 2A is traveling in the lane A from right to left, the license plate is imaged only by the plate checking camera _CN2A , and the other plate is imaged. Confirmation camera C _N1A , C _N1B , C
_{Not captured} by _N2B . Also, as shown in FIG. 8, when the vehicle 2B is traveling in the lane B from left to right, the license plate is imaged only by the plate checking camera C _N1B and the other plate checking cameras C _N1A. , C _N2A , and C _N2B are not imaged. Similarly, as shown in FIG. 9, when the automobile 2B is traveling in the lane B from right to left, the license plate is imaged only by the plate checking camera CN2B,
No image is _captured by the other plate confirmation cameras C _N1A , C _N2A , C _N1B .

Accordingly, the plate number reading unit 33 can execute the processing of step S21 from the number of plate numbers read by processing the image data output from each of the plate checking cameras C _{N1A to} C _N2B . The plate number reading unit 33 outputs the read plate number to the control unit 34 together with the IDs of the plate confirmation cameras C _{N1A to} C _N2B that have captured the image. The control unit 34 determines in step S
At 22, the vehicle with the license plate that has received the input is set as the measurement target vehicle.

In step S23, the arithmetic unit 32
The position detection camera C _D1A to process the image data output from the C _D2B, determine the velocity and acceleration of the measurement target vehicle.

Now, as shown in FIGS. 6 to 9, only one vehicle is traveling. In the case shown in FIG. 6, the vehicle 2A traveling in the lane A from left to right is a vehicle. The image is _captured by the detection camera _CD1A . Depending on the other position detection cameras C _D2A , C _D1B and C _D2B , the car 2A
No image is captured. Similarly, as shown in FIG.
There when the vehicle is traveling in the left lane A from the right, automotive 2A is imaged only by the vehicle detecting camera C _D2A, other position detection camera C _D1A, C _D1B, not captured by C _D2B.

As shown in FIG. 8, when the car 2B is moving in the lane B from left to right, the car 2B is imaged only by the position detection camera C _D1B , and the other position detection cameras C _D1A , The car 2B is not imaged depending on _CD2A and _CD2B . As shown in FIG. 9, the vehicle 2B is in the lane B
If you are traveling in the left direction from the right, automotive 2B only by the position detection camera C _D2B is captured, other position detection camera C _D1A, C _D2A, by C _D1B, automotive 2B is not captured.

The arithmetic unit 32 _selects image data of an image of the vehicle from the image data output by the position detection cameras C _{D1A to} C _D2B , and controls the timing at which the vehicle crosses the reference line L from the control unit 34. Alternatively, when the exhaust gas measuring unit 31 outputs a signal indicating a timing at which the exhaust gas measurement is completed, the image data of three consecutive frames at that timing is captured.

The operation unit 32 calculates the position (distance from the reference line L) of the vehicle 2 in the image of the first frame of the three consecutive frames and the position of the vehicle 2 in the image of the second frame. The position (distance from the reference line L) is calculated. Then, the arithmetic unit 32 further obtains the difference between the respective positions, divides the value of the difference by the time of the frame period (for example, 1/30 second in the case of the NTSC system), and obtains the speed of the car 2. .

Similarly, the calculation section 32 processes the image of the second frame and the image of the third frame to obtain the speed of the automobile 2. The calculation unit 32 calculates the average value of the two speeds thus obtained, and sets the average value as the speed of the vehicle 2. The calculation unit 32 further calculates
By dividing the difference between the two speeds by the frame period, the acceleration of the vehicle is calculated. Of course, also when obtaining the acceleration, a plurality of accelerations may be obtained and the average value thereof may be calculated.

If it is determined in step S21 that the number of license plates confirmed by the plate confirmation cameras C _{N1A to} C _N2B is not one (two),
Proceeding from step S21 to step S24, the control unit 34
Indicates that the vehicle having the license plate detected in each lane is a vehicle to be measured.

For example, as shown in FIG.
Is the car 2A, and lane B is the car 2B, respectively.
When running from left to right, the number of the car 2A
ー Plate is plate confirmation camera C_N1AImaged by
The license plate of the car 2B is
Mela C_N1BIs imaged. As shown in FIG.
And the cars 2A and 2B respectively move from right to left in the figure.
If you are driving in lanes A and B in the directions
2A license plate is plate check camera C _N2A
The license plate of the car 2B is
Rate confirmation camera C_{N 2B}Is imaged.

As shown in FIG. 12, the vehicle 2A travels in the lane A from left to right in the figure, and moves in the lane B in the vehicle 2B.
Is running from right to left, the license plate of the car 2A is imaged by the plate checking camera C _N1A , and the license plate of the car 2B is imaged by the plate checking camera C _N2B . Further, as shown in FIG. 13, when the vehicle 2A is traveling in the lane A from right to left in the figure and the vehicle 2B is traveling in the lane B from left to right in the figure, the vehicle 2A The license plate is imaged by the plate check camera C _N2A , and the license plate of the automobile 2B is the plate check camera C _N1B
Is imaged.

In the cases shown in FIGS. 10 to 13, both the automobiles 2A and 2B are to be measured.

Next, the operation proceeds to step S25, where the operation unit 32
From the output of the position detection camera C _D1A to C _D2B, determine the velocity and acceleration of each measurement target vehicle.

For example, in the case shown in FIG. 10, by processing the image data output from the position detection camera _CD1A , the speed and acceleration of the automobile 2A are obtained in the same manner as in step S23, and the position detection is performed. The speed and acceleration of the automobile 2B are calculated from the image data output from the camera _CD1B .

[0096] Similarly, the case shown in FIG. 11, the output of the position detection camera C _D2A, velocity and acceleration are determined automotive 2A, determined the speed and acceleration of the car 2B from the output of the position detection camera C _D2B Can be In the case shown in FIG. 12, the speed and acceleration of the motor vehicle 2A is obtained from the output of the position detection camera C _D1A, the position detection camera C _D2B
The speed and acceleration of the vehicle 2B are obtained from the output of.
In the case shown in FIG. 13, the position detection camera C
The speed and acceleration of the vehicle 2A are obtained from the output of _D2A , and the speed and acceleration of the vehicle 2B are obtained from the output of the position detection camera _CD1B .

[0097] In this case, as described in step S23, the motor vehicle 2A, also determined distance D _A and D _B from the reference line L of 2B.

In step S26, the operation unit 32
In step S25, the motor vehicle 2A obtained when determining the speed, 2B distance D _A from the reference line L, the difference D _B (D _A
By calculating the -D _B), and calculates the distance D _GAP automotive 2A and car 2B.

For example, in the case shown in FIGS. 10 and 11,
Distance D _{GA P} automobile 2A and car 2B, the distance D _A and D _B
Is the difference.

On the other hand, in the case shown in FIGS. 12 and 13, the distance D _GAP between the car 2A and the car 2B is the distance D _A
The sum of the distance D _B.

When the vehicle specifying process in step S6 of FIG. 4 is performed as described above, the process proceeds to step S7, where the control unit 34 stores the measurement result in the database 35 corresponding to the specified vehicle. Execute the process of storing.

FIG. 14 shows an example of information stored in the database 35. The plate number is the number of the plate read by the plate number reading unit 33. The measurement date and time is the date and time when the exhaust gas measuring unit 31 measures the exhaust gas. Of course, this date and time is the date and time when the operation unit 32 detected the position of the automobile 2 from the image data captured by the position detection cameras C _{D1A to} C _D2B , or the plate number reading unit 33 output the plate confirmation cameras C _{N1A to} C _N2B . Therefore, it is also possible to set the date and time when the plate is read.

The exhaust gas measurement value is a value measured by the exhaust gas measurement unit 31. The position, speed, and acceleration are the position, speed, and acceleration of the vehicle calculated by the calculation unit 32.

In the case of the examples shown in FIGS.
Only units were detected. Therefore, in this case, the plate number, the measurement date and time, the exhaust gas measurement value, the position, the speed, and the acceleration are used as information about the vehicle.
Stored in the database 35.

On the other hand, in the cases shown in FIGS. 10 to 13, two vehicles are detected and their exhaust gas is measured. Therefore, in this case, the measurement date and time, the exhaust gas measurement value, the position, the speed, and the acceleration are stored in the database 35 for the vehicle 2A in accordance with the plate number.
And the plate number, the position, the speed, and the acceleration of the vehicle 2B which is the vehicle to be measured simultaneously are stored in correspondence with the plate number of the vehicle 2A.

Similarly, the measurement date and time, exhaust gas measurement value, position, speed and acceleration of the vehicle 2B are registered in the database 35 corresponding to the plate number of the vehicle 2B, and the plate number and the position of the vehicle 2A. , Speed, and acceleration are registered together as the plate number, position, speed, and acceleration of the vehicle to be simultaneously measured.

The above processing is continuously executed for 24 hours every time the automobile runs between the light projecting unit 3 and the light receiving unit 4. As a result, the state of the exhaust gas of the vehicle traveling at that position is sequentially accumulated in the database 35.

Using such information, the control unit 34 further executes the measurement value processing shown in the flowchart of FIG. 15 at a predetermined timing.

[0109] First, in step S41, extracts a vehicle of a given plate number registered in the database 35 as the determination target vehicle reads the exhaust gas measurement value of the determination target vehicle, and its value as E _1. The combustion state of the engine also changes depending on the speed and acceleration of the vehicle. Therefore, the control unit 34 calculates the value of the measurement value E ₁
The speed and acceleration are converted as parameters into values for comparison with the reference value E _R as necessary. Next, step S4
In 2, the control unit 34, a measured value E _1, is compared with a predetermined reference value E _R which is set in advance. If the measured value E ₁ is equal to or smaller than the reference value E _R (if the amount of harmful substances contained in the exhaust gas is small), step S
Proceeding to 43, the control unit 34 sets the state of the determination target vehicle to “good” and registers it in the database 35.

For example, as shown in FIG. 6 to FIG. 9, not only such determination processing is performed in accordance with the measurement result when the number of vehicles to be measured is one, but also As shown in FIGS. 10 to 13, the same processing is executed when the number of measurement target vehicles is two. That is, in the cases shown in FIGS. 10 to 13, it is not specified whether the measured value of the exhaust gas is based on the exhaust gas of the automobile 2A or the automobile 2B. Is mixed,
Since the measured value is equal to or less than the reference value, there is no reason to determine that the state of the vehicle is “bad”. Therefore, in this case, the determination target vehicle is determined to be “good”.

If it is determined in step S that the measured value E ₁ is larger than the reference value E _R , the process proceeds to step S 44
The control unit 34 determines whether or not the simultaneous measurement target vehicle is registered at the time when the exhaust gas measurement value read in step S41 is measured. When there is no simultaneous measurement target vehicle, as shown in any of FIGS. 6 to 9, it means that the measurement value is measured in one vehicle. Therefore, in this case, the process proceeds to step S45, and the control unit 34 sets the state of the determination target vehicle to “defective” and registers it in the database 35.

On the other hand, in step S44,
When it is determined that the simultaneous measurement target vehicle exists, the process proceeds to step S46, and the control unit 34 determines whether the state of the simultaneous measurement target vehicle is registered in the database 35. If the state of the simultaneous measurement target vehicle has been registered, the process proceeds to step S48, and the control unit 34 determines whether or not the state of the simultaneous measurement target vehicle has been registered as “good”.

If the state of the simultaneous measurement target vehicle is registered as "good", the process proceeds to step S49, where the control unit 34 determines whether the state of only one determination target vehicle is within one month. It is determined whether or not is registered. Then, the measured value of the determination target vehicle within one month, what the difference between the current value E ₁ is the case is below a predetermined threshold value, the exhaust gas measurement value is larger than the reference value (exhaust gas Is considered to be caused by the exhaust gas of the vehicle to be determined. Therefore, in this case, the process proceeds to step S45, and a process of registering the state of the determination target vehicle in the database 35 as “defective” is executed.

On the other hand, if the difference between the measured value of the vehicle to be determined within one month and the value E ₁ is larger than the threshold value, 1
In the past judgments within one month, the condition of the judgment target vehicle is likely to be “good”, and it is unlikely that the condition of the vehicle suddenly deteriorates in one month. E
_It is unclear whether the reason why ₁ is larger than the reference value E _R is due to the exhaust gas of the vehicle to be determined or the exhaust gas of the vehicle to be simultaneously measured. Therefore, in this case, the process proceeds to step S47, and the control unit 34 processes the state of the determination target vehicle as “unknown”. In other words, no positive determination of “good” or “bad” is made.

The same applies to the case where there is no registration of a judgment value within one month in the state of one vehicle to be judged.

The state of the vehicle subject to simultaneous measurement is determined to be "bad".
Even if it has been registered, the measured value E ₁Is the reference value E_RBeyond
Whether the cause is the vehicle to be judged
Step S
47, and the process of setting the state of the target vehicle to “unknown” is actually performed.
Is performed.

The control unit 34 further executes a process of outputting a notification requesting improvement of the vehicle to the owner of the vehicle registered in the database 35 as "bad" as described above. Upon receiving this notice, the owner brings the vehicle to the designated inspection organization, undergoes a detailed inspection,
If it is confirmed that emissions of harmful substances exceeding the reference value are exhausted, improvement is required. If the owner does not make the improvement within a predetermined period, a fine or the like will be imposed.

In the above description, the vehicle is identified by the plate number. However, the identification information may be generated from a wireless device attached to the vehicle and received. In short, it is only necessary to detect a feature that can identify a car.

The object to be measured is not limited to automobiles, but can be various types of vehicles.

The above series of processing can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software executes various functions by installing a computer incorporated in the measurement system 21 or various programs. For example, it is installed from a recording medium to a general-purpose personal computer or the like.

As shown in FIG. 3, the recording medium is a magnetic disk 41 (including a floppy disk) on which the program is recorded, which is distributed separately from the measuring system 21 to provide the user with the program. Optical disk 4
2 (CD-ROM (Compact Disk-Read Only Memory), DVD (Digi
tal Versatile Disk), magneto-optical disk 43
(Including an MD (Mini-Disk)) or a package medium including a semiconductor memory 44, and a program that is provided to the user in a state where the program is incorporated in the measurement system 21 in advance. RO
It consists of M and hard disk.

In the present specification, the steps of describing the program recorded on the recording medium may be performed not only in chronological order but also in chronological order in the order described. This also includes processing executed in parallel or individually.

In this specification, the system is
It represents the entire device composed of a plurality of devices.

[0124]

As described above, according to the measuring system, the measuring method, and the program of the recording medium of the present invention, a plurality of vehicles traveling in a plurality of lanes at the timing of detecting exhaust gas are detected and stored. With this configuration, it is possible to specify which of the plurality of vehicles emits exhaust gas containing harmful substances.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a use state of a measurement system to which the present invention is applied.

FIG. 2 is a diagram illustrating the position of a camera in a measurement system to which the present invention is applied.

FIG. 3 is a block diagram illustrating a configuration example of a measurement system to which the present invention is applied.

FIG. 4 is a flowchart illustrating a measurement process performed by the measurement system of FIG. 3;

FIG. 5 is a flowchart illustrating details of a vehicle specifying process in step S6 of FIG. 4;

FIG. 6 is a diagram illustrating a positional relationship between a position detection camera and a vehicle of a plate number confirmation camera.

FIG. 7 is a diagram illustrating a positional relationship between a position detection camera and a plate number confirmation camera of an automobile.

FIG. 8 is a diagram illustrating a positional relationship between a position detection camera and a plate number confirmation camera of an automobile.

FIG. 9 is a diagram illustrating a positional relationship between a position detection camera and a plate number confirmation camera of an automobile.

FIG. 10 is a diagram illustrating a positional relationship between a position detection camera and a plate number confirmation camera of an automobile.

FIG. 11 is a diagram illustrating a positional relationship between a position detection camera and a plate number confirmation camera of an automobile.

FIG. 12 is a diagram illustrating a positional relationship between a position detection camera and a plate number confirmation camera of an automobile.

FIG. 13 is a diagram illustrating a positional relationship between a position detection camera and a vehicle of a plate number confirmation camera.

FIG. 14 is a diagram showing an example of registration information in the database of FIG. 3;

FIG. 15 is a flowchart illustrating measurement value processing executed by the measurement system of FIG. 3;

[Explanation of symbols]

_{DESCRIPTION OF SYMBOLS} 1 Road 2A, 2B Car 3 Light _emitting part 4 Light receiving part 21 Measurement system 31 Exhaust gas measuring part 32 Operation part 33 Plate number reading part 34 Control part 35 Database C _{D1A thru} C _D2B position detection camera C _{N1A thru} C _N2B plate confirmation camera

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G08G 1/04 G08G 1/04 C F term (Reference) 2G059 AA01 BB01 CC04 DD12 EE01 FF06 HH01 HH03 JJ02 KK01 KK04 MM01 MM05 MM10 5B057 AA16 BA02 BA19 DA07 DA11 DB02 DB03 DC30 DC36 5H180 AA01 CC01 CC04 DD02 DD10 EE02

Claims (10)

[Claims] 1. An exhaust gas detecting means for receiving light emitted so as to cross a space on a traveling road having a plurality of lanes and detecting exhaust gas emitted by a vehicle traveling on the lane; Vehicle detecting means for detecting a plurality of vehicle positions traveling on each of the plurality of lanes at a timing when the detecting means detects the exhaust gas; and a vehicle at a timing when the exhaust gas detecting means detects the exhaust gas. The detection result of the plurality of vehicles by the detection means and the detection result by the exhaust gas detection means,
A measuring system, comprising: a storage unit for storing correspondingly. 2. The vehicle detection unit detects a plurality of vehicles traveling in each of the plurality of lanes based on a light blocking state of the light emitted by the exhaust gas detection unit. Item 2. The measurement system according to Item 1. 3. The vehicle according to claim 2, further comprising: a determination unit configured to determine whether the detection result of the exhaust gas detection unit can be applied to the vehicle traveling on each of the plurality of lanes. 3. The measurement system according to 1 or 2. 4. The exhaust gas detecting means includes: a light generating means for generating light that traverses a space on the plurality of lanes; and a light generated by the light generating means on one side of the traveling path. 4. The measurement system according to claim 1, further comprising a light receiving unit that receives light on the other side of the traveling path. 5. An exhaust gas detection control step of receiving light emitted so as to cross a space on a traveling road having a plurality of lanes and controlling detection of exhaust gas emitted by a vehicle traveling on the lane; A vehicle detection control step of controlling detection of a plurality of vehicles traveling in each of the plurality of lanes at a timing at which detection of the exhaust gas is controlled by the processing of the exhaust gas detection control step; and A detection result of the plurality of vehicles controlled by the processing of the vehicle detection control step and a detection result controlled by the processing of the exhaust gas detection control step at a timing when the detection of the exhaust gas is controlled by the processing of the step; A storage control step of controlling a corresponding storage. 6. An exhaust gas detection control step of receiving light emitted so as to cross a space on a traveling road having a plurality of lanes and controlling detection of exhaust gas emitted by a vehicle traveling on the lane; A vehicle detection control step of controlling detection of a plurality of vehicles traveling in each of the plurality of lanes at a timing at which detection of the exhaust gas is controlled by the processing of the exhaust gas detection control step; and A detection result of the plurality of vehicles controlled by the processing of the vehicle detection control step and a detection result controlled by the processing of the exhaust gas detection control step at a timing when the detection of the exhaust gas is controlled by the processing of the step; And a storage control step for controlling a corresponding storage. Recording medium in which the ram is recorded. 7. Exhaust gas detecting means for receiving light emitted so as to cross a space on a traveling road having a plurality of lanes and detecting exhaust gas emitted by a vehicle traveling on the lane; Vehicle detecting means for detecting a plurality of vehicle positions traveling on each of the plurality of lanes at a timing when the detecting means detects the exhaust gas; and detecting a result of the exhaust gas detecting means within a predetermined period. And a storage means for storing the information based on the measurement result. 8. Exhaust gas detection means for receiving light emitted so as to cross a space on a traveling road having a plurality of lanes and detecting exhaust gas emitted by a vehicle traveling on the lane; Vehicle detecting means for detecting a vehicle traveling on a lane; vehicle characteristic detecting means for detecting characteristics of a vehicle traveling on each lane; and the vehicle detected when the vehicle detecting means detects only one vehicle And a storage means for storing the detected lane information, the detected characteristics of the vehicle, and the detected exhaust gas amount. 9. An exhaust gas detecting step of receiving light emitted so as to cross a space on a traveling road having a plurality of lanes and detecting exhaust gas exhausted by a vehicle traveling on the lane; A vehicle detecting step of detecting a vehicle traveling on a lane; a vehicle characteristic detecting step of detecting a characteristic of a vehicle traveling on each lane; and detecting only one vehicle in the processing of the vehicle detecting step. A storage step of storing lane information of the vehicle, detected characteristics of the vehicle, and detected exhaust gas amounts. 10. Exhaust gas detection means for receiving light emitted so as to cross a space on a traveling road having a plurality of lanes and detecting exhaust gas emitted by a vehicle traveling on the lane; Determining means for determining whether the amount of exhaust gas detected by the detecting means satisfies a predetermined criterion; vehicle detecting means for detecting a vehicle traveling on each lane; and a vehicle detecting means for detecting a vehicle traveling on each lane. Vehicle feature detection means for detecting a feature, wherein the vehicle detection means detects a vehicle in two or more lanes,
A measurement system comprising: a storage unit that stores, when it is determined that the detected exhaust gas amount of the vehicle satisfies a predetermined criterion, a characteristic of the detected vehicle and a determination result.