CN108535138A - Proportion detection device and method for green channel vehicle - Google Patents

Abstract

The invention discloses a specific gravity detection device of a vehicle in a green channel, which is used to be installed in the detection channel, and includes a control processing device, a trigger electrically connected to the control processing device, a vehicle identification unit, a weighing unit, and a volume detection unit Start the work of the vehicle identification unit and the volume detection unit through the trigger to obtain the length and cross-sectional area data of the vehicle, and use the weighing unit to obtain the weight data of the vehicle to calculate the density of the goods carried by the vehicle. The invention also discloses a specific gravity detection method for vehicles in the green channel, using the specific gravity detection device of the vehicle in the green channel, and judging that the cargo carried by the vehicle meets the vehicle standard of the green channel by calculating the density of the goods. The main purpose is to quickly detect whether the goods carried by the green channel vehicles meet the standards for the green channel vehicles.

Description

Specific gravity detection device and method for green channel vehicles

technical field

The invention relates to the technical field of on-board cargo detection, in particular to a specific gravity detection device and method for vehicles in green passages.

Background technique

The green channel refers to the "green channel" for road transportation of fresh and live agricultural products. If the agricultural products transported by vehicles meet the categories stipulated in the "Quality Catalog of Fresh and Live Agricultural Products", they can enjoy the convenience of exempting tolls in the "green channel" of expressways.

While the national policy supports the "three rural issues" and promotes people's livelihood, some vehicles take advantage of the loopholes of the national policy, loading a large amount of non-agricultural products inside the vehicle, and covering the outside with only a small amount of fresh agricultural products, thereby evading road tolls and causing serious damage to the public. The country has caused a lot of losses, affecting the healthy development of the green channel policy. Therefore, it is necessary to detect the green channel on the expressway to determine whether the vehicle is camouflaged.

At present, there are mainly two detection methods for green channel vehicles: manual detection and radar/ultrasonic detection. The speed of manual detection is slow, and the work intensity of the staff is high. Check the goods at the bottom; radar/ultrasonic detection mainly uses radar or ultrasonic reflection and refraction to detect internal objects, and according to the different absorption and reflection capabilities of different media for signals, to judge whether there are prohibited items inside the green channel vehicle , but due to the irregular shapes of different types of goods and the different degrees of sparseness of accumulation, there are often large errors in the detection results.

Contents of the invention

The problem to be solved by the present invention is to provide a specific gravity detection device for green channel vehicles and a method for judging whether the cargo carried by the vehicle meets the green channel vehicle standard based on the detection result of the specific gravity detection device.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

Design a specific gravity detection device for green channel vehicles, which is used to be installed in the detection channel, including control processing equipment, triggers that are electrically connected to the control processing equipment, vehicle identification units, weighing units, and volume detection units;

The trigger is divided into a first trigger and a second trigger. The first trigger is used to detect that a vehicle approaches or enters the detection channel. The height of the second trigger is set at a corresponding height to utilize the front of the vehicle The gap with the carriage detects the position of the head end of the carriage;

The volume detection unit includes a cross-section measurement component and a length measurement component, the cross-section measurement component and the length measurement component are respectively electrically connected to the control processing device in turn, and the cross-section measurement component includes a The first laser of the "one"-shaped light bar and the first camera for acquiring the image of the area containing the light bar, the length measurement assembly includes a locator and a second camera, and the locator is used to form a positioning mark on the vehicle , and the connection line between the positioning mark and the locator is perpendicular to the connection line between the second trigger and the locator, and the second camera is used to acquire Image.

Preferably, a fixing frame is provided on the detection channel, and the fixing frame includes at least four gate-shaped brackets arranged at equal intervals, which are sequentially divided into a first gate-shaped bracket and a second door-shaped bracket from the entrance side of the detection channel. Shaped bracket, the third door-shaped bracket, the fourth door-shaped bracket, a mounting beam is arranged between the beams of the first door-shaped bracket and the second door-shaped bracket, and the first laser and the first camera are installed on the installation On the beam, a first trigger is installed on the side of the first door-shaped bracket, and a second trigger is installed on the sides of the second door-shaped bracket, the third door-shaped bracket and the fourth door-shaped bracket; The locator and the second camera are respectively installed at different heights on the side of the second door-shaped support.

Further, the distance between two adjacent door-shaped supports is 6-8m.

Preferably, the positioner is a second laser, and the first laser and the second laser are both provided with light shields for forming dark light.

Preferably, the vehicle identification unit is a GW-PR-9902T/VPDIIAD series license plate recognizer, and the weighing unit is an EzWay-30 series quartz dynamic truck scale.

Design a specific gravity detection method for green channel vehicles, using the aforementioned specific gravity detection device for green channel vehicles, the control processing device stores a database containing all green channel cargo information data and all vehicle information data that are allowed to pass through, so The green channel cargo information includes cargo type and corresponding cargo density, and the vehicle information includes license plate number, vehicle model, vehicle net weight and maximum load, including the following steps:

When the vehicle approaches and triggers the first trigger, the control processing device controls the vehicle identification unit to acquire the license plate number of the vehicle, and acquires the vehicle model and vehicle net weight corresponding to the license plate number from the database; the control The processing device controls the weighing unit to obtain the actual weight G1 and the number of axles of the vehicle, and controls the cross-section measurement component to obtain the cross-sectional area S of the vehicle;

When the vehicle approaches and triggers the second trigger for the second time, the control processing device controls the length measuring component to acquire an image containing the positioning mark and the vehicle rear area, and performs an analysis of the included image. Processing the positioning mark and the image of the vehicle rear area to obtain the distance L1 between the positioning mark and the vehicle rear;

The control processing device calculates the theoretical density D1, compares the theoretical density with the green channel cargo information data in the sample library, judges whether the cargo carried by the vehicle meets the green channel vehicle standard, and outputs the detection result, wherein the second The distance between the trigger and the locator is L0, the self-weight of the vehicle is M0, and the cargo density is calculated .

Furthermore, the method for judging whether the goods carried by the vehicle meet the standards for green channel vehicles is:

Calculate the mathematical expectation E and standard deviation Sn of the current cargo density according to the theoretical density D1 of the current cargo in the sample library;

The probability density is calculated by the normal distribution formula, and the probability P of the current vehicle meeting the green channel passing standard is obtained after correction. The formula is:

,

When the probability P≥95%, it is judged that the cargo carried by the vehicle meets the vehicle standard of the green channel.

Compared with the prior art, the beneficial effect of the present invention is: by using the cooperation of the control processing equipment, trigger, vehicle identification unit, weighing unit and volume detection unit, the specific gravity detection device of the green channel vehicle can obtain the required specific gravity detection method. volume and weight data. Using the specific gravity detection device and density formula of the green channel vehicle, and comparing the detected density with the density of the green channel cargo, the specific gravity detection method can judge whether the goods carried by the vehicle meet the green channel vehicle standard. Especially after combining the probability formula, its practical application value is greatly improved.

Description of drawings

FIG. 1 is a schematic diagram of a volume detection unit of a specific gravity detection device for a vehicle in a green channel.

In the figure, 11 is a door-shaped bracket, 12 is a door-shaped bracket, 13 is a door-shaped bracket, 14 is a door-shaped bracket, 15 is a door-shaped bracket, 16 is a connecting rib, 17 is a mounting beam, and 21 is a first trigger. 22 is the second trigger, 23 is the second trigger, 24 is the second trigger, 311 is the first laser, 312 is the first camera, 321 is the locator, 322 is the second camera, 4 is the third camera.

Detailed ways

The specific implementation of the present invention will be described below in conjunction with the accompanying drawings and examples, but the following examples are only used to describe the present invention in detail, and do not limit the scope of the present invention in any way.

For the database used in the following examples, the commercially available PTSJ general database can meet the needs, the official website http://www.jh-lzf.com/.

Embodiment 1: A specific gravity detection device for a vehicle in a green channel, for installation in the detection channel, see Figure 1, including a control processing device and a trigger, a vehicle identification unit, and a weighing unit that are respectively electrically connected to the control processing device , Volume detection unit. In this embodiment, the control processing device is a computer equipped with an image acquisition card, and the computer stores a database containing all green channel cargo information data and all vehicle information data that are allowed to pass through. The green channel cargo information includes the type of cargo and the corresponding cargo. Density, vehicle information includes license plate number, vehicle model, vehicle net weight and maximum load. Along the running direction of the vehicle, the detection channel is provided with a fixed mount, and the fixed mount includes a door-shaped bracket 11, a door-shaped bracket 12, a door-shaped bracket 13, a door-shaped bracket 14, and a door-shaped bracket 15 arranged at equal intervals L0. The ribs 16 connect the door-shaped bracket 11, the door-shaped bracket 12, the door-shaped bracket 13, the door-shaped bracket 14, and the door-shaped bracket 15 into one body, wherein the distance L0 ranges from 6 to 8 m. A mounting beam 17 connecting the door-shaped support 11 and the door-shaped support 12 is provided at the midpoint of the corresponding cross beam of the door-shaped support 11 and the door-shaped support 12 . In this embodiment, the side of the door-shaped bracket 11 is the entrance side of the detection channel.

The trigger is divided into a first trigger 21 installed on the door-shaped bracket 11, a second trigger 22 installed on the door-shaped bracket 12, a second trigger 23 installed on the door-shaped bracket 13, and a second trigger 23 installed on the door-shaped bracket 13. For the second trigger 24 on the bracket 14, in order to unify the installation position, the aforementioned triggers are all installed on the column of the corresponding door-shaped bracket, and have the same height. The first trigger 21 is used to detect that the vehicle approaches or enters the detection channel, and the heights of the second trigger 22, the second trigger 23 and the second trigger 24 are set at corresponding heights to detect the gap between the front of the vehicle and the compartment The head end position of the carriage. In this embodiment, the trigger uses a photoelectric sensor.

The volume detection unit includes a cross-section measurement component and a length measurement component, and the cross-section measurement component and the length measurement component are respectively electrically connected to the control processing equipment in turn.

The cross-section measurement assembly includes a first laser 311 for forming a "one" beam in the width direction of the vehicle and a first camera 312 for acquiring an image of an area containing a light strip. In this embodiment, the first laser 311 and The first camera 312 is installed on the mounting beam 17, and the camera head of the first camera 312 is arranged vertically downwards, and the "one"-shaped light beam that the first laser 311 sends is perpendicular to the vertical plane where the vehicle running direction is located, and the first camera 312 can shoot The light bar formed when the "one"-shaped light beam is irradiated on the vehicle. In order to enable the first camera 312 to better photograph the laser surface emitted by the first laser 311 , compared with the first camera 312 , the first laser 311 is arranged closer to the entrance side of the detection channel.

The length measurement assembly includes a locator 321 and a second camera 322. The locator 321 is used to form a positioning mark on the vehicle, and the connection line between the positioning mark and the locator is perpendicular to the connection line between the second trigger and the locator 321, and the second The camera 322 is used to obtain images including the positioning marks and the rear area of the vehicle. In this embodiment, the locator 321 adopts a point laser, and the light emitted by the point laser can be a small dot or a cross star. The positioner 321 is installed on the column of the door-shaped support 12 .

For the measurement method of the volume detection unit, please refer to a fixed automatic volume measurement system and its measurement method disclosed in Chinese patent document CN102980512A.

As an improvement, a light shield (not shown) for forming dark light is provided outside the first laser 311 and the positioner 321 .

The vehicle recognition unit includes a third camera 4, which is correspondingly connected to the control processing device. In this embodiment, GW-PR-9902T/VPDIIAD series license plate recognizer is selected as the vehicle recognition unit, and the processing unit of the license plate recognizer is connected to the control processing device through a network cable. .

In this embodiment, the weighing unit is an existing dynamic truck scale, and the EzWay-30 series quartz dynamic truck scale is selected, which can identify the number of axles of the vehicle.

In this embodiment, the first camera 312, the second camera 322, and the third camera 4 are respectively electrically connected to the image acquisition card, and the first laser 311, the locator 321, the first trigger 21, the second trigger 22, the second The second trigger 23 and the second trigger 24 are electrically connected to the computer through the RS232 control card, wherein the first trigger 21, the second trigger 22, the second trigger 23 and the second trigger 24 are used as the forward circuit of the computer The components of the first laser 311 and the positioner 321 are used as the components of the backward circuit of the computer.

When the specific gravity detection device of the above-mentioned green channel vehicle is used, when the vehicle approaches and triggers the first trigger 21, the control processing device controls the vehicle recognition unit to capture the license plate image of the vehicle, and processes the license plate image to obtain the license plate number, and then Obtain the vehicle model and vehicle net weight M0 corresponding to the license plate number from the database; when the vehicle approaches and triggers the second trigger 22, the control processing device controls the first laser 311 to emit a "one"-shaped beam, which is irradiated on the vehicle to form a light strips, and control the first camera 312 to obtain images containing light strip areas, and process the images containing light strip areas to obtain the vehicle cross-sectional area S; control the weighing unit to obtain the actual weight G1 and The number of axles, when the number of axles of the vehicle is less than four axles, the second triggering moment of the second trigger 23 is used as the start signal; when the number of axles of the vehicle is more than five axles, the second triggering moment of the second trigger 24 The second trigger moment is used as a start signal to control the length locator 321 to emit a beam, and the beam forms a positioning mark on the vehicle. At the same time, the second camera 322 acquires an image containing the position mark and the rear area of the vehicle for processing to obtain the positioning mark and the rear of the vehicle. Distance L1.

When the number of wheel axles of the vehicle is less than four axles, the distance between the second trigger 23 and the positioner 321 is L0=L; when the number of wheel axles of the vehicle is more than five axles, the distance between the second trigger 24 and the positioner 321 is L0=L 2L; via the formula: , to calculate the theoretical density D1.

Embodiment 2: A specific gravity detection method for green channel vehicles, using the specific gravity detection device for green channel vehicles in embodiment 1, the control processing equipment stores all the green channel cargo information data and all vehicle information that are allowed to pass through. In the data database, the green channel cargo information includes the type of cargo and the corresponding cargo density, and the vehicle information includes the license plate number, vehicle model, vehicle net weight and maximum load, including the following steps:

When the vehicle approaches and triggers the first trigger, the control processing device controls the vehicle identification unit to acquire the license plate number of the vehicle, and acquires the vehicle model and vehicle net weight M0 (quality) corresponding to the license plate number from the database; control The processing device controls the weighing unit to obtain the actual weight G1 (weight) and the number of axles of the vehicle, controls the cross-section measurement component to obtain the image containing the light strip area, and processes the image containing the light strip area to obtain the vehicle section W;

When the vehicle approaches and triggers the second trigger for the second time, the control processing device controls the length measuring component to acquire an image containing the positioning mark and the vehicle rear area, and performs an analysis of the included image. The positioning mark and the image of the vehicle rear area are processed to obtain the distance L1 between the positioning mark and the vehicle rear. Assume that the distance between the second trigger and the locator is L0, and the second trigger is set according to the length of the vehicle. As in Embodiment 1, the first trigger 21, the second trigger 22, and the second trigger are arranged equidistantly at the interval L. 23. The second trigger 24, wherein the positioner 321 and the second trigger 22 are installed on the same column. When the number of axles corresponding to the vehicle is less than four axles, the second trigger 23 is taken as the corresponding second trigger , L0=L; when the number of axles corresponding to the vehicle is more than five axles, take the second trigger 24 as the corresponding second trigger, L0=2L; the reason why the vehicle approaches and triggers the second trigger for the second time Yes: After the control processing device selects the corresponding second trigger according to the number of axles of the vehicle, first, the front of the vehicle triggers the second trigger first, and when the gap between the front of the vehicle and the compartment passes the second trigger, The second trigger is in a state to be triggered. When the second trigger is triggered again, it corresponds to the head end of the compartment. In this way, when the vehicle approaches and triggers the second trigger for the second time, the second trigger detects It is the head end of the carriage.

According to the theoretical density calculation formula: , where g is the gravitational constant, the control processing equipment calculates the theoretical density D1, and compares the theoretical density with the green channel cargo information data in the sample library. When the theoretical density is consistent with the green channel cargo information data in the sample library, judge The goods carried by the vehicle meet the vehicle standards of the green channel, otherwise it is judged that the goods carried by the vehicle do not meet the vehicle standards of the green channel, and then output the detection result, that is, the judgment result, and take manual review measures as needed.

Embodiment 3: A specific gravity detection method for green passage vehicles, as an improvement to embodiment 2, the method for judging whether the goods carried by the vehicle meet the green passage vehicle standards is:

Calculate the mathematical expectation E and standard deviation Sn of the current cargo density according to the theoretical density D1 of the current cargo in the sample library;

The probability density is calculated by the normal distribution formula, and the probability P of the current vehicle meeting the green channel passing standard is obtained after correction. The formula is:

,

When the probability P≥95%, it is judged that the goods carried by the vehicle meet the vehicle standards of the green channel. When the probability P<95%, it is judged that the goods carried by the vehicle do not meet the vehicle standards of the green channel, and manual review measures are taken as needed.

By adopting the method in this embodiment and using probability, error factors in practical applications can be ignored, thereby reducing the practical difficulties in Embodiment 2.

The present invention has been described in detail above in conjunction with the accompanying drawings and embodiments. However, those skilled in the art can understand that each specific parameter in the above embodiments can also be changed without departing from the spirit of the present invention. A number of specific embodiments are formed, all of which are common variation scopes of the present invention, and will not be described in detail here.

Claims (7)

1. A specific gravity detection device of a green channel vehicle, which is used to be installed in the detection channel, is characterized in that it includes a control processing device and a trigger that is electrically connected to the control processing device, a vehicle identification unit, a weighing unit, a volume detection unit; The trigger includes a first trigger and a second trigger, the first trigger is used to detect the vehicle approaching or entering the detection channel, and the second trigger is set at a certain height to utilize the front of the vehicle and the The gap between the carriages detects the position of the head end of the carriage; The volume detection unit includes a cross-section measurement component and a length measurement component, the cross-section measurement component and the length measurement component are respectively electrically connected to the control processing device in turn, and the cross-section measurement component includes a The first laser of the "one"-shaped light bar and the first camera for acquiring the image of the area containing the light bar, the length measurement assembly includes a locator and a second camera, and the locator is used to form a positioning mark on the vehicle , and the connection line between the positioning mark and the locator is perpendicular to the connection line between the second trigger and the locator, and the second camera is used to acquire Image. 2. The specific gravity detecting device of the green channel vehicle as claimed in claim 1, wherein the detection channel is provided with a fixed mount, and the fixed mount includes at least four gate-shaped brackets arranged at equal intervals, from the The entrance side of the detection channel is sequentially divided into a first gantry, a second gantry, a third gantry, and a fourth gantry, and the beams of the first gantry and the second gantry are provided with There is an installation beam, the first laser and the first camera are installed on the installation beam, the first trigger is installed on the side of the first door-shaped bracket, the second door-shaped bracket, the third door-shaped bracket and the sides of the fourth door-shaped bracket are respectively equipped with second triggers; the positioner and the second camera are respectively installed at different heights on the sides of the second door-shaped bracket. 3. The specific gravity detection device for green channel vehicles according to claim 2, characterized in that the distance between two adjacent gate-shaped brackets is 6-8m. 4. The specific gravity detection device of the green channel vehicle according to claim 1, wherein the locator is a second laser, and a light shield for forming dark light is arranged outside the first laser and the second laser . 5. The specific gravity detection device for green channel vehicles according to claim 1, wherein the vehicle identification unit is a GW-PR-9902T/VPDIIAD series license plate identifier, and the weighing unit is an EzWay-30 series quartz type dynamic truck scale. 6. A specific gravity detection method for green channel vehicles, utilizing the specific gravity detection device of the green channel vehicle described in any one of claims 1-5, the control processing equipment is stored with all green channels that allow passing through Cargo information data, a database of all allowed vehicle information data, the green channel cargo information includes cargo type and corresponding cargo density, and the vehicle information includes license plate number, vehicle model, vehicle net weight and maximum load, characterized in that, Include the following steps: When the vehicle approaches and triggers the first trigger, the control processing device controls the vehicle identification unit to acquire the license plate number of the vehicle, and acquires the vehicle model and vehicle net weight corresponding to the license plate number from the database; the control The processing device controls the weighing unit to obtain the actual weight G1 and the number of axles of the vehicle, and controls the cross-section measurement component to obtain the cross-sectional area S of the vehicle; When the vehicle approaches and triggers the second trigger for the second time, the control processing device controls the length measuring component to acquire an image containing the positioning mark and the vehicle rear area, and performs an analysis of the included image. Processing the positioning mark and the image of the vehicle rear area to obtain the distance L1 between the positioning mark and the vehicle rear; The control processing device calculates the theoretical density D1, compares the theoretical density with the green channel cargo information data in the sample library, judges whether the cargo carried by the vehicle meets the green channel vehicle standard, and outputs the detection result, wherein the second The distance between the trigger and the locator is L0, the self-weight of the vehicle is M0, and the cargo density is calculated . 7. The specific gravity detection method for green passage vehicles as claimed in claim 6, wherein the method for judging whether the goods carried by the vehicle meet the green passage vehicle standards is: Calculate the mathematical expectation E and standard deviation Sn of the current cargo density according to the theoretical density D1 of the current cargo in the sample library; The probability density is calculated by the normal distribution formula, and the probability P of the current vehicle meeting the green channel passing standard is obtained after correction. The formula is: , When the probability P≥95%, it is judged that the cargo carried by the vehicle meets the vehicle standard of the green channel.