CN113686421B - Vehicle detection device and method - Google Patents
Vehicle detection device and method Download PDFInfo
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- CN113686421B CN113686421B CN202111010062.7A CN202111010062A CN113686421B CN 113686421 B CN113686421 B CN 113686421B CN 202111010062 A CN202111010062 A CN 202111010062A CN 113686421 B CN113686421 B CN 113686421B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/03—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing during motion
- G01G19/035—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing during motion using electrical weight-sensitive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B11/043—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B11/046—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring width
Abstract
The invention discloses a vehicle detection device and method, relates to the technical field of vehicle detection, and aims to solve the problem that the prior art scheme cannot accurately correct a vehicle weight measurement result. The vehicle detection device comprises an overload measurement device, wherein the overload measurement device comprises a control unit, a vehicle overload overrun server, a front ground induction coil, a piezoelectric quartz weighing sensor, a vehicle track sensor and a piezoelectric film weighing sensor; the control unit corrects the vehicle weight measured by the piezoelectric quartz weighing sensor and the piezoelectric film weighing sensor through the output signal of the vehicle track sensor, and a high-precision vehicle weight measurement result is obtained.
Description
Technical Field
The invention relates to the technical field of vehicle detection, in particular to a vehicle detection device and method, which can automatically measure the weight and the outline size of a vehicle to obtain the overload overrun condition of the detected vehicle.
Background
When the vehicle overload overrun measuring device is installed on site, as the distance of the weighing sensor along the width direction of the lane is longer, the weighing sensor is influenced by factors such as uneven road surface, deformation of the sensor and the like during the on-site installation, the axle weight amplification coefficient of the calibrated weighing sensor changes along the width direction of the lane, the axle weight measuring data of the weighing sensor is required to be corrected according to the wheel track along the width direction of the lane, and the existing vehicle overload overrun measuring device or scheme lacks a vehicle wheel driving track measuring device, so that the vehicle weight measuring result is difficult to be corrected with high precision.
Disclosure of Invention
The invention aims to provide a vehicle detection device and a vehicle detection method, which are used for measuring the running track of wheels of a vehicle so as to obtain a high-precision vehicle weight measurement result.
In order to achieve the above object, the present invention provides the following solutions:
the vehicle detection device comprises an overload measurement device, wherein the overload measurement device comprises a control unit 10, a vehicle overload overrun server 11, a front ground induction coil 1, a piezoelectric quartz weighing sensor 2, a vehicle track sensor 3 and a piezoelectric film weighing sensor 4;
the piezoelectric quartz weighing sensor 2 is transversely embedded under the pavement of the lane;
the front ground induction coil 1 is buried under the road surface of a lane behind the piezoelectric quartz weighing sensor 2 according to the advancing direction of the vehicle;
the piezoelectric film weighing sensor 4 is transversely buried under the road surface of the lane in front of the piezoelectric quartz weighing sensor 2 according to the advancing direction of the vehicle, and the piezoelectric film weighing sensor 4 is parallel to the piezoelectric quartz weighing sensor 2;
the vehicle track sensor 3 is connected with the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 according to a diagonal line;
the front ground induction coil 1, the piezoelectric quartz weighing sensor 2, the vehicle track sensor 3 and the piezoelectric film weighing sensor 4 are respectively connected with the control unit 10, and the control unit 10 is connected with the vehicle overload overrun server 11; the control unit 10 corrects the measurement results of the wheel axle weights of the piezoelectric quartz load cell 2 and the piezoelectric film load cell 4 by the vehicle track sensor 3.
The piezoelectric film load cell 4 is replaced with a narrow plate load cell 5; the narrow plate type weighing sensor 5 is connected with a control unit 10.
The overload measuring device further comprises a narrow plate type weighing sensor 5, and the narrow plate type weighing sensor 5 is transversely embedded under a roadway surface in front of the piezoelectric film weighing sensor 4 according to the advancing direction of the vehicle; the narrow plate type weighing sensor 5 is connected with a control unit 10.
The vehicle detection device also comprises an overrun measuring device, wherein the overrun measuring device comprises an L-bar 7, a vehicle length and height laser measuring unit 8 and a vehicle height and width laser measuring unit 9;
the L rod 7 is arranged at a certain distance on the road surface in front of the overload measuring device according to the advancing direction of the vehicle;
the vehicle length and height laser measuring unit 8 and the vehicle height and width laser measuring unit 9 are arranged on the cross beam of the L-shaped rod 7;
the vehicle length and height laser measuring unit 8 and the vehicle height and width laser measuring unit 9 are respectively connected with the control unit 10.
A vehicle detection method comprising the steps of:
calculating according to output signals of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 to obtain an axle weight signal of a running vehicle;
calculating to obtain the axle number signal of each vehicle according to the output signal of the front ground induction coil 1;
calculating to obtain the total weight M of the vehicle according to the axle weight signal of the vehicle and the axle number signal of the vehicle;
obtaining a vehicle running track according to the vehicle track sensor 3, and correcting the total vehicle weight M according to the vehicle running track to obtain the corrected total vehicle weight;
the corrected total weight of the vehicle is judged, whether the vehicle is overloaded is determined, and judgment information is stored in the vehicle overload overrun server 11.
A vehicle detection method comprising the steps of:
the axle weight signal of the running vehicle is calculated according to the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4, and the vehicle speed v is calculated 1 ；
Calculating to obtain the axle number signal of each vehicle according to the output signal of the front ground induction coil 1;
calculating to obtain the total weight M of the vehicle according to the axle weight signal of the vehicle and the axle number signal of the vehicle;
correcting the total vehicle weight M according to the vehicle speed to obtain the corrected total vehicle weight;
the corrected total weight of the vehicle is judged, whether the vehicle is overloaded is determined, and judgment information is stored in the vehicle overload overrun server 11.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
1. compared with the prior art, the vehicle detection device provided by the invention is provided with the wheel track measurement device, and the accurate positions of the wheels passing through the piezoelectric quartz weighing sensor and the piezoelectric film weighing sensor can be measured, so that the vehicle detection device can correct the axle weight measurement data of the piezoelectric quartz weighing sensor and the piezoelectric film weighing sensor along the width direction of a lane to obtain a high-precision vehicle weight measurement result.
2. The piezoelectric film weighing sensor and the piezoelectric quartz weighing sensor can be combined to measure the vehicle speed, the vehicle axle weight measuring result can be corrected according to the vehicle speed, the vehicle weight measuring precision is further improved, the test data of the piezoelectric film weighing sensor can be used for verifying the test data of the piezoelectric quartz weighing sensor, and the vehicle detecting device can be warned about whether faults occur.
3. The vehicle detection device provided by the invention is provided with the narrow plate type weighing sensor, and can accurately measure the weight of the vehicle at low speed even at rest.
4. The invention also has a vehicle overrun measuring device which can measure the length, width and height of the vehicle, correct the measured length, width and height data according to the vehicle speed, and judge whether the vehicle overruns or not by comparing the measured length, width and height data with pre-stored vehicle outline size limit value data.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a vehicle detection device field model;
fig. 2 is a schematic diagram showing the overall composition of the vehicle detection device.
Reference numerals illustrate:
1-a front ground induction coil; 2-a piezoelectric quartz weighing sensor; 3-a vehicle track sensor; 4-a piezoelectric film weighing sensor; 5-narrow plate type weighing sensor; 6-a rear ground induction coil; 7-L poles; 8-a vehicle length and height laser measurement unit; 9-a vehicle width and height laser measurement unit; 10-a control unit; 11-vehicle overload overrun server.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a vehicle detection device and a vehicle detection method, which can obtain a vehicle weight measurement result with higher accuracy.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1:
referring to fig. 1 and 2, a vehicle detection device provided in an embodiment of the invention includes: the overload measuring device comprises a control unit 10, a vehicle overload overrun server 11, a front ground induction coil 1, a piezoelectric quartz weighing sensor 2, a vehicle track sensor 3 and a piezoelectric film weighing sensor 4;
the piezoelectric quartz weighing sensor 2 is transversely embedded under the pavement of the lane;
the front ground induction coil 1 is buried under the road surface of a lane behind the piezoelectric quartz weighing sensor 2 according to the advancing direction of the vehicle;
the piezoelectric film weighing sensor 4 is transversely embedded under a lane road surface in front of the piezoelectric quartz weighing sensor 2 according to the vehicle advancing direction, and the piezoelectric film weighing sensor 4 is parallel to the piezoelectric quartz weighing sensor 2;
the vehicle track sensor 3 is connected with the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 according to a diagonal line;
the front ground induction coil 1, the piezoelectric quartz weighing sensor 2, the vehicle track sensor 3 and the piezoelectric film weighing sensor 4 are respectively connected with the control unit 10, and the control unit 10 is connected with the vehicle overload overrun server 11.
As can be seen from the structure of the vehicle detecting device, the vehicle overload measuring device according to the present invention further includes a vehicle track sensor 3 diagonally connected to the piezoelectric quartz load cell 2 and the piezoelectric film load cell 4. According to the moment that the wheel passes through the piezoelectric quartz weighing sensor 2, the vehicle track sensor 3 and the piezoelectric film weighing sensor 4, the distance between the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 can be calculated by interpolation according to the installation distance between the piezoelectric quartz weighing sensor 2 and the vehicle track sensor 3. Meanwhile, according to the width of the lane and by utilizing the triangle similarity principle, the invention can obtain the accurate position of the wheel when passing through the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4. Accordingly, the invention can correct the axle weight measurement data of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 along the width direction of the lane, so that the invention can measure the vehicle weight data with higher accuracy.
The invention can also calculate the running speed v of the vehicle according to the installation distance of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 and the moment that the wheel passes through the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 1 。
The front ground induction coil 1 is used for detecting vehicle in-place information and triggering a snapshot camera to snapshot the vehicle license plate.
Meanwhile, as the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 are both high-dynamic and high-precision sensors, the piezoelectric effect of piezoelectric materials is utilized, the invention can calculate the axle load of the vehicle when the vehicle speed is higher than 1km/h by utilizing the signals of the piezoelectric quartz weighing sensor 2 and the signals of the piezoelectric film weighing sensor 4, and utilize the axle load signal m of the vehicle measured by the signals of the piezoelectric film weighing sensor 4 2 Vehicle axle weight signal m measured by piezoelectric quartz weighing sensor 2 signal 1 And checking is carried out, so that the accuracy of the vehicle weight measurement result is further ensured. The verification mode is to judge m 1 And m is equal to 2 If the test data error is within a defined range, say the defined range is-10%, if the test data error is within the defined range, the vehicle axle weight measurement data is valid, in m 1 The control is true; if the error of the test data exceeds the limit range, the vehicle axle load measurement data are invalid, and the vehicle detection device records a log and gives an early warning that the device has faults.
In view of uncertainty in the vehicle speed, the vehicle speed may be higher than 1km/h or lower than 1km/h. Even if the vehicle remains stationary, the vehicle speed is zero. The above-mentioned vehicle detection device is obviously no longer suitable when the vehicle speed is below 1km/h or even when the vehicle is stationary. Based on this, another implementation manner in the vehicle detection device in the above embodiment is:
the piezoelectric film load cell 4 is replaced with a narrow plate load cell 5; the narrow plate type weighing sensor 5 is connected with a control unit 10.
The narrow plate type weighing sensor 5 is a resistance strain type vehicle weighing sensor, and is a sensor with good static performance and low cost. The narrow plate type weighing sensor 5 can realize the axle weight measurement of the vehicle with the speed lower than 1km/h or when the vehicle is stationary. The invention can accumulate the axle weight measurement results of the narrow plate type weighing sensor 5, thereby calculating the total weight of the vehicle.
And when the vehicle speed is between 1km/h and 10km/h, the axle weight measurement result of the narrow plate type weighing sensor 5 can also be used for checking the axle weight measurement of the piezoelectric quartz weighing sensor 2. The verification mode is as follows: the set range is-15%, when the measurement error of the two is beyond the set range, the vehicle axle weight measurement data are invalid, and the vehicle detection device records a log and gives an early warning that the device has faults; and if the measurement errors of the two are in the set range, correcting the axle weight measurement of the piezoelectric quartz weighing sensor 2 according to the axle weight measurement result of the narrow plate type weighing sensor 5. The correction method includes taking an average of both as a final vehicle axle weight measurement result.
The implementation manner in the vehicle detection device in the above example may also be:
the overload measuring device further comprises a narrow plate type weighing sensor 5, and the narrow plate type weighing sensor 5 is transversely embedded under a roadway surface in front of the piezoelectric film weighing sensor 4 according to the advancing direction of the vehicle; the narrow plate type weighing sensor 5 is connected with a control unit 10.
The function of the narrow plate type weighing sensor 5 includes checking the axle weight measurement result of the piezoelectric film weighing sensor 4 in addition to the function of the above embodiment.
In view of the fact that the vehicle license plate is not clear in snapshot or the situation of missing shooting and the like when the front ground induction coil 1 is used for triggering the snapshot camera to snapshot the vehicle license plate. This can lead to failure to determine information about the vehicle when it is overloaded. Based on this, another implementation of the above embodiment is:
the overload measuring device also comprises a rear ground induction coil 6; the rear ground induction coil 6 is transversely embedded under the road surface of the lane in front of the piezoelectric film weighing sensor 4 according to the advancing direction of the vehicle; the rear ground inductance coil 6 is connected to the control unit 10.
Or in the case where the narrow plate type weighing sensor 5 is included in the above embodiment, the implementation manner of the above embodiment further includes:
the rear ground induction coil 6 is buried under the road surface of the lane in front of the narrow plate type weighing sensor 5 according to the advancing direction of the vehicle; the rear ground inductance coil 6 is connected to the control unit 10.
The rear ground induction coil 6 is used for detecting that the vehicle leaves the overload measuring device and triggering the snapshot camera to snapshot the license plate number; at the same time, the invention can also measure the speed v of the vehicle according to the time interval between the starting signals of the front ground induction coil 1 and the rear ground induction coil 6 and the distance between the front ground induction coil and the rear ground induction coil 2 Vehicle speed v 2 Can be used for the vehicle speed v 1 And (5) checking.
In view of the fact that the vehicle does not only experience an overload situation, an overrun situation may also occur. Based on this, another implementation of the above embodiment includes:
the vehicle detection device also comprises an overrun measuring device, wherein the overrun measuring device comprises an L-bar 7, a vehicle length and height laser measuring unit 8 and a vehicle height and width laser measuring unit 9;
the L rod 7 is arranged at a certain distance of the road surface in front of the overload measuring device according to the advancing direction of the vehicle; the vehicle length and height laser measuring unit 8 and the vehicle height and width laser measuring unit 9 are arranged on the cross beam of the L-shaped rod 7;
the vehicle length and height laser measuring unit 8 and the vehicle height and width laser measuring unit 9 are respectively connected with the control unit 10.
As can be seen from the structure of the vehicle detection device, the present invention can also determine whether the vehicle is overrun by the vehicle length and height laser measurement unit 8 and the vehicle height and width laser measurement unit 9.
The vehicle length and height laser measurement unit 8 scans along the vehicle advancing direction, the scanning surface is perpendicular to the road, after the vehicle leaves the vehicle overload measurement device, for example, after the vehicle leaves the rear ground induction coil 6, the vehicle detection device starts to record the laser scanning data of the vehicle length and height laser measurement unit 8, and after the vehicle leaves the L rod 7, the vehicle detection device finishes recording the laser scanning data of the vehicle length and height laser measurement unit 8. The distance l between the surface point of the vehicle and the vehicle length and height laser measuring unit 8 is acquired according to the data of each scanning surface scanned by the vehicle length and height laser measuring unit 8 to the vehicle body 5 And an angle α, wherein α ranges from-5 ° to 185 °. According to the distance l 5 Angle α and vehicle length, height laser measuring unit 8 mounting height h 1 Calculating vehicle height data h Long length And length data L:
h long length ＝max(h 1 -l 5 ·cosα),
L＝max(l 5 ·sinα)-min(l 5 ·sinα)
The principle can be briefly described as calculating the recorded data of each scanning surface scanned to the car body one by one, and taking the car body height data h Long length The maximum value of the vehicle length data L is taken as the vehicle length data.
The vehicle height and width laser measuring unit 9 scans along the side direction of the vehicle, the scanning surface is perpendicular to the road, when the vehicle height and width laser measuring unit 9 scans that the vehicle reaches the L-shaped rod 7, the vehicle detecting device starts to record the laser scanning data of the vehicle height and width laser measuring unit 9, and when the vehicle height and width laser measuring unit 9 scans that the vehicle leaves the L-shaped rod 7, the vehicle detecting device finishes recording the laser scanning data of the vehicle height and width laser measuring unit 9. Scanning by the laser measuring unit 9 according to the height and width of the vehicleDistance l between the surface point of the data acquisition vehicle and the vehicle height and width laser measuring unit 9 for each scanning surface of the vehicle body 6 And an angle beta, wherein the range of beta is-5-185 degrees, specifically based on the angle corresponding to the point actually scanned to the vehicle body. According to the distance l 6 Angle beta and vehicle height, width laser measuring unit 9 mounting height h 2 Calculating vehicle height data h Wide width of And width data L 1 :
h Wide width of ＝max(h 2 -l 6 ·cosβ),
L 1 ＝max(l 6 ·sinβ)-min(l 6 ·sinβ)
The principle can be briefly described as calculating the recorded data of each scanning surface scanned to the car body one by one, and taking the car body height data h Wide width of As vehicle height data, vehicle width data L is taken 1 As vehicle width data.
The vehicle height data obtained by the vehicle length and height laser measuring unit 8 and the vehicle height and width laser measuring unit 9 are compared, and a large value is taken as the final result of the vehicle height. For the length, width and height data of the vehicle obtained by the overrun measuring device, the vehicle speed v is calculated according to the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 1 After correction, accurate measurement results of the length, width and height of the vehicle can be obtained.
Example 2:
the present embodiment is directed to providing a vehicle detection method, which is performed by using the vehicle detection apparatus provided in embodiment 1. The principle is that a vehicle track sensor 3 is utilized to acquire the running track of vehicle wheels, and a vehicle weight measurement result is corrected according to the running track of the vehicle wheels, so that a high-precision vehicle weight measurement result is acquired. The vehicle detection method comprises the following steps:
step A1: calculating according to output signals of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 to obtain an axle weight signal of a running vehicle;
the step A1 specifically includes:
step a1.1: calculating to obtain a vehicle axle load signal m according to the output signal of the piezoelectric quartz weighing sensor 2 1 ；
Step a1.2: calculating to obtain a vehicle axle load signal m according to the output signal of the piezoelectric film weighing sensor 4 2 ；
Step a1.3: according to the vehicle axle load signal m 2 For vehicle axle load signal m 1 Checking when the axle load signal m of the vehicle 2 And a vehicle axle weight signal m 1 When the test data error of (a) exceeds a limit range, a vehicle axle load signal m 2 And a vehicle axle weight signal m 1 Invalid, recording logs and warning to prompt abnormality of the vehicle detection device; when the axle load signal m of the vehicle 2 And a vehicle axle weight signal m 1 When the test data error of (1) is in a limited range, the test data is valid, and the vehicle axle weight signal m is used 1 To be accurate.
Step A2: calculating to obtain the axle number signal of each vehicle according to the output signal of the front ground induction coil 1;
step A3: calculating to obtain the total weight M of the vehicle according to the axle weight signal of the vehicle and the axle number signal of the vehicle;
step A4: obtaining a vehicle running track according to the vehicle track sensor 3, and correcting the total vehicle weight M according to the vehicle running track to obtain the corrected total vehicle weight;
the method for acquiring the vehicle driving track in the step A4 specifically comprises the following steps:
step a4.1: acquiring time t when wheel passes through piezoelectric quartz weighing sensor 2 1 Time t when the wheel passes the vehicle track sensor 3 2 And time t when the wheel passes through the piezoelectric film weighing sensor 4 3 ；
Step a4.2: according to the mounting distance l of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 1 The distance between the piezoelectric quartz weighing sensor 2 and the vehicle track sensor 3 is calculated by utilizing linear interpolation, wherein the calculation formula is as follows:
wherein l represents the distance between the carbide sensor 2 and the vehicle wheel tracking sensor 3, t 1 Indicating the moment of the wheel passing the piezoelectric quartz weighing sensor 2, t 2 Indicating the moment of the wheel passing the vehicle track sensor 3, t 3 Indicating the moment of the wheel passing through the piezo film weighing sensor 4, l 1 Representing the mounting distance of the piezoelectric quartz load cell 2 and the piezoelectric film load cell 4;
step a4.3: according to the lane width a, the accurate positions of the wheels passing through the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 are calculated by using the triangle similarity principle, and the calculation formula is as follows:
wherein l 2 Indicating the distance from the wheel passing through the carbide weighing sensor 2 and the piezoelectric film weighing sensor 4 to one end of the lane, specifically whether the left end or the right end of the lane is determined by the specific mode of diagonal connection of the vehicle wheel trace sensor 3, l indicates the distance between the carbide weighing sensor 2 and the vehicle wheel trace sensor 3, l 1 Indicating the mounting distance of the piezoelectric quartz load cell 2 and the piezoelectric film load cell 4, a indicating the lane width, t 1 Indicating the moment of the wheel passing the piezoelectric quartz weighing sensor 2, t 2 Indicating the moment of the wheel passing the vehicle track sensor 3, t 3 The moment at which the wheel passes the piezo film weighing sensor 4 is indicated.
Step A5: the total weight of the vehicle after the correction is judged, whether the vehicle is overloaded or not is determined, and judgment information is stored in the vehicle overload overrun server 11.
Example 3
The present embodiment is directed to providing a vehicle detection method, which is performed by using the vehicle detection apparatus provided in embodiment 1. The principle is that the vehicle weight measurement result is corrected according to the vehicle speed obtained by the vehicle detection device, so as to obtain the high-precision vehicle weight measurement result. The vehicle detection method comprises the following steps:
step B1: the axle weight signal of the running vehicle is calculated according to the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4, and the vehicle speed v is calculated 1 ；
Step B1, calculating the vehicle speed v 1 The method of (2) can also be:
step B1.1: calculating the vehicle speed v according to the time when the wheel passes through the piezoelectric quartz weighing sensor 2 and the time when the wheel passes through the piezoelectric film weighing sensor 4 and the installation distance between the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 1 ；
Step B1.2: calculating the vehicle speed v according to the time when the vehicle passes through the front and rear ground sensing coils and the installation distance between the front and rear ground sensing coils 2 ；
Step B1.3: by using the speed v of the vehicle 2 For vehicle speed v 1 Checking, when the test data errors of the two are beyond the limit range, the vehicle speed v 2 With vehicle speed v 1 Is invalid, records a log and gives early warning to prompt that the vehicle detection device is abnormal; when the test data errors of the two are in a limited range, the test data are valid, and the vehicle speed v is used for 1 To be accurate.
Step B2: calculating to obtain the axle number signal of each vehicle according to the output signal of the front ground induction coil 1;
step B3: calculating to obtain the total weight M of the vehicle according to the axle weight signal of the vehicle and the axle number signal of the vehicle;
step B4: according to the speed v of the vehicle 1 Correcting the total vehicle weight M to obtain corrected total vehicle weight;
the step B4 specifically may be:
step B4.1: the vehicle axle weight G is calculated according to the following formula:
G＝k·S·v
where k represents a weight coefficient, S represents a curve area during running of the vehicle through the piezoelectric quartz load cell 2, and v represents the vehicle speed v 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the weight coefficient k varies with the vehicle speed v;
step B4.2: based on the axle load signal G of the vehicle and the axle number signal of the vehicleThe number is calculated to obtain the total weight M of the vehicle Vehicle speed Based on the total vehicle weight M calculated from the axle weight signal G of the vehicle Vehicle speed And correcting the total vehicle weight M to obtain the corrected total vehicle weight.
Step B5: the corrected total weight of the vehicle is judged, whether the vehicle is overloaded is determined, and judgment information is stored in the vehicle overload overrun server 11.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (5)
1. A vehicle detection apparatus characterized in that: the overload measuring device comprises a control unit (10), a vehicle overload overrun server (11), a front ground induction coil (1), a piezoelectric quartz weighing sensor (2), a vehicle track sensor (3) and a piezoelectric film weighing sensor (4);
the piezoelectric quartz weighing sensor (2) is transversely embedded under the pavement of the lane;
the front ground induction coil (1) is buried under a roadway surface behind the piezoelectric quartz weighing sensor (2) according to the vehicle advancing direction;
the piezoelectric film weighing sensor (4) is transversely buried under a lane road surface in front of the piezoelectric quartz weighing sensor (2) according to the advancing direction of the vehicle, and the piezoelectric film weighing sensor (4) is parallel to the piezoelectric quartz weighing sensor (2);
the vehicle track sensor (3) is connected with the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4) according to a diagonal line;
the overload measuring device also comprises a rear ground induction coil (6);
the rear ground induction coil (6) is transversely embedded under a lane pavement in front of the piezoelectric film weighing sensor (4) according to the advancing direction of the vehicle;
the front ground induction coil (1), the rear ground induction coil (6), the piezoelectric quartz weighing sensor (2), the vehicle track sensor (3) and the piezoelectric film weighing sensor (4) are respectively connected with the control unit (10), and the control unit (10) is connected with the vehicle overload overrun server (11); the control unit (10) corrects the measurement results of the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4) on the axle weight of the wheel through the vehicle track sensor (3);
the vehicle detection device further comprises an overrun measuring device, wherein the overrun measuring device comprises an L-shaped rod (7), a vehicle length and height laser measuring unit (8) and a vehicle height and width laser measuring unit (9);
the L rod (7) is arranged at a certain distance of the road surface in front of the overload measuring device according to the advancing direction of the vehicle;
the vehicle length and height laser measuring unit (8) and the vehicle height and width laser measuring unit (9) are arranged on the cross beam of the L-shaped rod (7);
the vehicle length and height laser measuring unit (8) and the vehicle height and width laser measuring unit (9) are respectively connected with the control unit (10);
the control unit (10) is also used for correcting the total weight M of the vehicle according to the vehicle speed and calculating the length, width and height of the vehicle;
the method for correcting the total vehicle weight M according to the vehicle speed specifically comprises the following steps:
according to the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4), calculating to obtain an axle weight signal of the running vehicle, and calculating to obtain the vehicle speed v 1 ；
Calculating according to the output signal of the front ground induction coil (1) to obtain the axle number signal of each vehicle; calculating the total weight M of the vehicle according to the axle weight signal of the vehicle and the axle number signal of the vehicle;
the vehicle speed v is measured based on the time interval between the start signals of the front ground coil (1) and the rear ground coil (6), in combination with the distance between the front and rear ground coils 2 Vehicle speed v 2 For vehicle speed v 1 Checking;
according to the vehicle speed v 1 Correcting the total vehicle weight M to obtain corrected total vehicle weight;
the axle weight signal of the running vehicle is calculated according to the output signals of the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4), and the method specifically comprises the following steps:
calculating according to the output signal of the piezoelectric quartz weighing sensor (2) to obtain a vehicle axle load signal m 1 The method comprises the steps of carrying out a first treatment on the surface of the Calculating according to the output signal of the piezoelectric film weighing sensor (4) to obtain a vehicle axle load signal m 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the vehicle axle load signal m 2 For the vehicle axle weight signal m 1 Checking when the vehicle axle weight signal m 2 And the vehicle axle weight signal m 1 When the test data error of the vehicle axle weight signal m exceeds a limit range 2 And the vehicle axle weight signal m 1 Invalid, recording logs and warning to prompt abnormality of the vehicle detection device; when the vehicle axle weight signal m 2 And the vehicle axle weight signal m 1 When the test data error of the vehicle is in a limited range, the test data is valid, and the vehicle axle weight signal m is used 1 The control is true;
the vehicle speed v 1 The calculation method of (1) further comprises:
calculating the vehicle speed v according to the time when the wheel passes through the piezoelectric quartz weighing sensor (2) and the time when the wheel passes through the piezoelectric film weighing sensor (4) and the installation distance between the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4) 1 ；
By using the speed v of the vehicle 2 For vehicle speed v 1 Checking, when the test data errors of the two are beyond the limit range, the vehicle speed v 2 With vehicle speed v 1 Is invalid, records a log and gives early warning to prompt that the vehicle detection device is abnormal; when the test data errors of the two are in a limited range, the test data are valid, and the vehicle speed v is used for 1 The control is true;
the "according to the vehicle speed v 1 The total vehicle weight M is corrected to obtain corrected total vehicle weight', and the method specifically comprises the following steps:
the vehicle axle weight G is calculated according to the following formula:
G＝k·S·v
wherein k represents a weight coefficient, S represents a curve area during the running of the vehicle through the piezoelectric quartz load cell (2), and v represents the vehicle speed v 1 The method comprises the steps of carrying out a first treatment on the surface of the The weight coefficient k varies with the vehicle speed v;
calculating the total weight M of the vehicle according to the axle weight signal G of the vehicle and the axle number signal of the vehicle Vehicle speed Based on the total vehicle weight M calculated from the axle weight signal G of the vehicle Vehicle speed Correcting the total vehicle weight M to obtain corrected total vehicle weight;
the vehicle detection method further includes: calculating the length, width and height of the vehicle;
the method specifically comprises the following steps of calculating the length, width and height of the vehicle:
the distance l between the surface point of the vehicle and the vehicle length and height laser measuring unit (8) is acquired according to the data of each scanning surface scanned by the vehicle length and height laser measuring unit (8) to the vehicle body 5 Angle alpha and vehicle length, height laser measuring unit (8) installation height h 1 Calculating vehicle height data h Long length And length data L:
h long length ＝max(h 1 -l 5 ·cosα),
L＝max(l 5 ·sinα)-min(l 5 ·sinα)
The distance l between the surface point of the vehicle and the vehicle height and width laser measuring unit (9) is acquired according to the data of each scanning surface scanned by the vehicle height and width laser measuring unit (9) to the vehicle body 6 Angle beta and vehicle height, width laser measuring unit (9) mounting height h 2 Calculating vehicle height data h Wide width of And width data L 1 ：
h Wide width of ＝max(h 2 -l 6 ·cosβ),
L 1 ＝max(l 6 ·sinβ)-min(l 6 ·sinβ)
Laser measuring unit for vehicle length and height (8)Comparing the obtained vehicle height data with the height data obtained by the vehicle height and width laser measuring unit (9), and taking a large value as a final result of the vehicle height; for the length, width and height data of the vehicle obtained by the overrun measuring device, the vehicle speed v calculated according to the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4) 1 After correction, accurate measurement results of the length, width and height of the vehicle can be obtained.
2. The vehicle detection apparatus according to claim 1, characterized in that: replacing the piezoelectric film weighing sensor (4) in the overload measuring device with a narrow plate type weighing sensor (5); the narrow plate type weighing sensor (5) is connected with the control unit (10).
3. The vehicle detection apparatus according to claim 1, characterized in that: the overload measuring device further comprises a narrow plate type weighing sensor (5), and the narrow plate type weighing sensor (5) is transversely embedded under a lane pavement in front of the piezoelectric film weighing sensor (4) according to the advancing direction of the vehicle; the narrow plate type weighing sensor (5) is connected with the control unit (10).
4. A vehicle detection apparatus according to claim 2 or 3, characterized in that: the overload measuring device also comprises a rear ground induction coil (6);
the rear ground induction coil (6) is buried under a roadway surface in front of the narrow plate type weighing sensor (5) according to the advancing direction of the vehicle; the rear ground induction coil (6) is connected with the control unit (10).
5. A vehicle detection method characterized by comprising the steps of:
according to the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4), calculating to obtain an axle weight signal of the running vehicle, and calculating to obtain the vehicle speed v 1 ；
Calculating according to the output signal of the front ground induction coil (1) to obtain the axle number signal of each vehicle; calculating the total weight M of the vehicle according to the axle weight signal of the vehicle and the axle number signal of the vehicle;
the vehicle speed v is measured based on the time interval between the start signals of the front ground coil (1) and the rear ground coil (6), in combination with the distance between the front and rear ground coils 2 Vehicle speed v 2 For vehicle speed v 1 Checking;
according to the vehicle speed v 1 Correcting the total vehicle weight M to obtain corrected total vehicle weight;
the axle weight signal of the running vehicle is calculated according to the output signals of the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4), and the method specifically comprises the following steps:
calculating according to the output signal of the piezoelectric quartz weighing sensor (2) to obtain a vehicle axle load signal m 1 The method comprises the steps of carrying out a first treatment on the surface of the Calculating according to the output signal of the piezoelectric film weighing sensor (4) to obtain a vehicle axle load signal m 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the vehicle axle load signal m 2 For the vehicle axle weight signal m 1 Checking when the vehicle axle weight signal m 2 And the vehicle axle weight signal m 1 When the test data error of the vehicle axle weight signal m exceeds a limit range 2 And the vehicle axle weight signal m 1 Invalid, recording logs and warning to prompt abnormality of the vehicle detection device; when the vehicle axle weight signal m 2 And the vehicle axle weight signal m 1 When the test data error of the vehicle is in a limited range, the test data is valid, and the vehicle axle weight signal m is used 1 The control is true;
the vehicle speed v 1 The calculation method of (1) further comprises:
calculating the vehicle speed v according to the time when the wheel passes through the piezoelectric quartz weighing sensor (2) and the time when the wheel passes through the piezoelectric film weighing sensor (4) and the installation distance between the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4) 1 ；
By using the speed v of the vehicle 2 For vehicle speed v 1 Checking, when the test data errors of the two are beyond the limit range, the vehicle speed v 2 With vehicle speed v 1 Is invalid, records a log and gives early warning to prompt that the vehicle detection device is abnormal; when both are in contact with each otherWhen the test data error of (a) is in a limited range, the test data is valid at the speed v 1 The control is true;
the "according to the vehicle speed v 1 The total vehicle weight M is corrected to obtain corrected total vehicle weight', and the method specifically comprises the following steps:
the vehicle axle weight G is calculated according to the following formula:
G＝k·S·v
wherein k represents a weight coefficient, S represents a curve area during the running of the vehicle through the piezoelectric quartz load cell (2), and v represents the vehicle speed v 1 The method comprises the steps of carrying out a first treatment on the surface of the The weight coefficient k varies with the vehicle speed v;
calculating the total weight M of the vehicle according to the axle weight signal G of the vehicle and the axle number signal of the vehicle Vehicle speed Based on the total vehicle weight M calculated from the axle weight signal G of the vehicle Vehicle speed Correcting the total vehicle weight M to obtain corrected total vehicle weight;
the vehicle detection method further includes: calculating the length, width and height of the vehicle;
the method for calculating the length, width and height of the vehicle specifically comprises the following steps:
the distance l between the surface point of the vehicle and the vehicle length and height laser measuring unit (8) is acquired according to the data of each scanning surface scanned by the vehicle length and height laser measuring unit (8) to the vehicle body 5 Angle alpha and vehicle length, height laser measuring unit (8) installation height h 1 Calculating vehicle height data h Long length And length data L:
h long length ＝max(h 1 -l 5 ·cosα),
L＝max(l 5 ·sinα)-min(l 5 ·sinα)
The distance l between the surface point of the vehicle and the vehicle height and width laser measuring unit (9) is acquired according to the data of each scanning surface scanned by the vehicle height and width laser measuring unit (9) to the vehicle body 6 Angle beta and vehicle height, width laser measuring unit (9) mounting height h 2 Calculating vehicle height data h Wide width of And width data L 1
h Wide width of ＝max(h 2 -l 6 ·cosβ),
L 1 ＝max(l 6 ·sinβ)-min(l 6 ·sinβ)
Comparing the vehicle height data obtained by the vehicle length and height laser measuring unit (8) with the height data obtained by the vehicle height and width laser measuring unit (9), and taking a large value as a final result of the vehicle height; for the length, width and height data of the vehicle obtained by the overrun measuring device, the vehicle speed v calculated according to the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4) 1
After correction, accurate measurement results of the length, width and height of the vehicle can be obtained.
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| CN103473948A (en) * | 2013-09-23 | 2013-12-25 | 合肥工业大学 | Piezoelectric cable layout structure and overloaded vehicle wheel line horizontal position identification method |
| CN106979812A (en) * | 2016-01-15 | 2017-07-25 | 广西大学 | A kind of vehicle on highway dynamic weighing system |
| CN109696232A (en) * | 2017-10-20 | 2019-04-30 | 山东省交通科学研究院 | The automatic calibration method of road axle load spectrum detection system |
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| CN104655249B (en) * | 2015-03-16 | 2017-04-12 | 武汉大学 | System and method for automatically measuring dimension and weight of road vehicle |
| CN106872008A (en) * | 2015-12-14 | 2017-06-20 | 广西大学 | A kind of dynamic weighing transverse sensitivity of sensor bearing calibration |
| CN107228628A (en) * | 2017-07-10 | 2017-10-03 | 山西省自动化研究所 | A kind of vehicle traveling dynamic measurement system and its measuring method |
| CN109238420A (en) * | 2018-11-05 | 2019-01-18 | 广州普勒仕交通科技有限公司 | The not parking weighing detection device and method that quartz is combined with piezoresistive transducer |
| CN112857543A (en) * | 2021-01-13 | 2021-05-28 | 深圳亿维锐创科技股份有限公司 | Dynamic weighing system for detecting wide-speed full-driving behavior under off-site law enforcement |
| CN113124974B (en) * | 2021-04-20 | 2021-12-31 | 山东大学 | Vehicle overload detection method, system, storage medium and equipment |
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| CN103473948A (en) * | 2013-09-23 | 2013-12-25 | 合肥工业大学 | Piezoelectric cable layout structure and overloaded vehicle wheel line horizontal position identification method |
| CN106979812A (en) * | 2016-01-15 | 2017-07-25 | 广西大学 | A kind of vehicle on highway dynamic weighing system |
| CN109696232A (en) * | 2017-10-20 | 2019-04-30 | 山东省交通科学研究院 | The automatic calibration method of road axle load spectrum detection system |
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