CN113686421A - Vehicle detection device and method - Google Patents
Vehicle detection device and method Download PDFInfo
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- CN113686421A CN113686421A CN202111010062.7A CN202111010062A CN113686421A CN 113686421 A CN113686421 A CN 113686421A CN 202111010062 A CN202111010062 A CN 202111010062A CN 113686421 A CN113686421 A CN 113686421A
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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
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Abstract
The invention discloses a vehicle detection device and a vehicle detection method, relates to the technical field of vehicle detection, and aims to solve the problem that the prior art cannot correct a vehicle weight measurement result with high precision. The vehicle detection device comprises an overload measuring device, wherein the overload measuring device comprises a control unit, a vehicle overload overrun server, a front ground induction coil, a piezoelectric quartz weighing sensor, a vehicle wheel 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 wheel track sensor to obtain a high-precision vehicle weight measurement result.
Description
Technical Field
The invention relates to the technical field of vehicle detection, in particular to a vehicle detection device and a vehicle detection method, which can automatically measure the weight and the overall dimension of a vehicle to obtain the overload and overrun condition of the detected vehicle.
Background
When the vehicle overload and overrun measuring device is installed on site, because the distance of the weighing sensor along the width direction of the lane is long and is influenced by factors such as uneven road surface and sensor deformation during the installation on site, the axle weight amplification coefficient of the calibrated weighing sensor changes along the width direction of the lane, and the axle weight measurement data of the weighing sensor needs to be corrected according to the wheel track along the width direction of the lane, but the existing vehicle overload and overrun measuring device or scheme lacks a vehicle wheel running track measuring device, and the vehicle weight measurement result is difficult to correct with high precision.
Disclosure of Invention
The invention aims to provide a vehicle detection device and a vehicle detection method, which can obtain a high-precision vehicle weight measurement result by measuring the running track of a vehicle wheel.
In order to achieve the purpose, the invention provides the following scheme:
a 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 wheel track sensor 3 and a piezoelectric film weighing sensor 4;
the piezoelectric quartz weighing sensor 2 is transversely buried under the road surface of the lane;
the front ground induction coil 1 is buried under the lane road 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 the roadway surface in front of the piezoelectric quartz weighing sensor 2 in the advancing direction of the vehicle, and the piezoelectric film weighing sensor 4 is parallel to the piezoelectric quartz weighing sensor 2;
the vehicle wheel track sensor 3 is connected with the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 according to diagonal lines;
the front ground induction coil 1, the piezoelectric quartz weighing sensor 2, the vehicle wheel track sensor 3 and the piezoelectric film weighing sensor 4 are respectively connected with a control unit 10, and the control unit 10 is connected with a vehicle overload and 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 wheel axle weights by the vehicle wheel track sensor 3.
The piezoelectric film weighing sensor 4 is replaced by a narrow plate type weighing sensor 5; the narrow plate load cell 5 is connected to a control unit 10.
The overload measuring device also comprises a narrow plate type weighing sensor 5, wherein the narrow plate type weighing sensor 5 is transversely embedded under the roadway surface in front of the piezoelectric film weighing sensor 4 according to the advancing direction of the vehicle; the narrow plate load cell 5 is connected to a control unit 10.
The vehicle detection device also comprises an overrun measuring device, wherein the overrun measuring device comprises an L rod 7, a vehicle length and height laser measuring unit 8 and a vehicle height and width laser measuring unit 9;
the L-shaped rod 7 is arranged at a certain distance from 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 a 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 a control unit 10.
A vehicle detection method, comprising the steps of:
calculating to obtain an axle load signal of a running vehicle according to output signals of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4;
calculating to obtain an 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 wheel track sensor 3, and correcting the total weight M of the vehicle according to the vehicle running track to obtain the corrected total weight of the vehicle;
and judging the corrected total weight of the vehicle, determining whether the vehicle is overloaded, and storing the judgment information to the vehicle overload and overrun server 11.
A vehicle detection method, comprising the steps of:
calculating to obtain the axle load signal of the running vehicle according to the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4, and calculating to obtain the vehicle speed v1；
Calculating to obtain an 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 weight M of the vehicle according to the vehicle speed to obtain the corrected total weight of the vehicle;
and judging the corrected total weight of the vehicle, determining whether the vehicle is overloaded, and storing the judgment information to the vehicle overload and 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 measuring device, and can be used for measuring the accurate positions of the wheels passing through the piezoelectric quartz weighing sensor and the piezoelectric film weighing sensor.
2. The piezoelectric film weighing sensor and the piezoelectric quartz weighing sensor are combined to measure the vehicle speed, the vehicle axle load 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 checked, and early warning can be carried out on whether a vehicle detection device breaks down or not.
3. The vehicle detection device provided by the invention is provided with the narrow-plate weighing sensor, and the weight of the vehicle can be accurately measured at low speed or even at a standstill.
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 overrun by comparing with the prestored vehicle outline dimension 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 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a field model of a vehicle inspection device;
fig. 2 is a schematic view of the overall composition of the vehicle detection device.
Description of reference numerals:
1-front ground induction coil; 2-piezoelectric quartz weighing sensor; 3-vehicle wheel track sensor; 4-piezoelectric film weighing sensor; 5-narrow plate weighing sensor; 6-rear ground induction coil; 7-L rod; 8-vehicle length, height laser measuring unit; 9-vehicle width and height laser measuring unit; 10-a control unit; 11-vehicle overload overrun server.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 precision.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
referring to fig. 1 and fig. 2, a vehicle detecting device according to an embodiment of the present invention includes: the overload measuring device comprises a control unit 10, a vehicle overload and overrun server 11, a front ground induction coil 1, a piezoelectric quartz weighing sensor 2, a vehicle wheel track sensor 3 and a piezoelectric film weighing sensor 4;
the piezoelectric quartz weighing sensor 2 is transversely buried under the road surface of the lane;
the front ground induction coil 1 is buried under the lane road 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 the roadway surface in front of the piezoelectric quartz weighing sensor 2 in the advancing direction of the vehicle, and the piezoelectric film weighing sensor 4 is parallel to the piezoelectric quartz weighing sensor 2;
the vehicle wheel track sensor 3 is connected with the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 according to diagonal lines;
the front ground induction coil 1, the piezoelectric quartz weighing sensor 2, the vehicle wheel track sensor 3 and the piezoelectric film weighing sensor 4 are respectively connected with a control unit 10, and the control unit 10 is connected with a vehicle overload and overrun server 11.
According to the structure of the vehicle detection device, the vehicle overload measuring device further comprises a vehicle wheel track sensor 3 which is connected with the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 in a diagonal manner. According to the time when the wheel passes through the piezoelectric quartz weighing sensor 2, the vehicle wheel track sensor 3 and the piezoelectric film weighing sensor 4 and the installation distance of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4, the distance between the piezoelectric quartz weighing sensor 2 and the vehicle wheel track sensor 3 can be calculated through calculation. Meanwhile, according to the width of the lane, by utilizing the principle of similarity of triangles, the accurate position of the wheel passing through the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 can be obtained. Therefore, 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 precision.
The invention can also calculate the vehicle running speed v according to the installation distance between the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 and the time when the wheel runs through the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 41。
The front ground induction coil 1 is used for detecting vehicle in-place information and triggering the snapshot camera to snapshot the number plate of the vehicle.
Meanwhile, because the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 are both high-dynamic and high-precision sensors, and the piezoelectric effect of the piezoelectric material is utilized, the invention can utilize the signal of the piezoelectric quartz weighing sensor 2 and the signal of the piezoelectric film weighing sensor 4 to calculate the vehicle axle weight when the vehicle speed is higher than 1km/h, and utilize the vehicle axle weight signal m measured by the signal of the piezoelectric film weighing sensor 4 to measure2Vehicle axle load signal m measured by piezoelectric quartz weighing sensor 2 signal1And checking is carried out, so that the accuracy of the vehicle weight measurement result is further ensured. The check mode is m judgment1And m2If the error of the test data is in the limited range, for example, the limited range is-10%, if the error of the test data is in the limited range, the vehicle axle weight measurement data is valid, and m is used1The method comprises the following steps of (1) taking; if the error of the test data exceeds the limited range, the vehicle axle load measurement data is invalid, and the vehicle detection device records a log and warns the prompt device of the occurrence of a fault.
In view of the uncertainty of the running speed of the vehicle, the speed of the vehicle may be higher than 1km/h or lower than 1 km/h. Even if the vehicle remains stationary, the vehicle speed is zero. In the case of a vehicle speed lower than 1km/h, or even a stationary vehicle, the above-described vehicle detection device is obviously no longer applicable. Based on this, another embodiment of the vehicle detection device in the above embodiment is:
the piezoelectric film weighing sensor 4 is replaced by a narrow plate type weighing sensor 5; the narrow plate load cell 5 is connected to 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 weighing sensor 5 can realize the measurement of the vehicle axle weight when the vehicle speed is lower than 1km/h or the vehicle is static. 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 verifying the axle weight measurement of the piezoelectric quartz weighing sensor 2. The checking mode is as follows: the set range is-15%, when the measurement error of the two exceeds the set range, the vehicle axle load measurement data is invalid, and the vehicle detection device records logs and warns the warning and prompting device to break down; and if the measurement error of the piezoelectric quartz weighing sensor and the narrow plate type weighing sensor is within 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 above-described correction method includes obtaining an average value of both as a final vehicle axle load measurement result.
The embodiment of the vehicle detection device in the above embodiment may be:
the overload measuring device also comprises a narrow plate type weighing sensor 5, wherein the narrow plate type weighing sensor 5 is transversely embedded under the roadway surface in front of the piezoelectric film weighing sensor 4 according to the advancing direction of the vehicle; the narrow plate load cell 5 is connected to a control unit 10.
The function of the narrow-plate weighing sensor 5 includes, in addition to the function in the above embodiment, verifying the axle weight measurement result of the piezoelectric film weighing sensor 4.
In view of the situation that the captured vehicle license plate is unclear or the situation of missing the capturing and the like can occur when the capturing camera is triggered to capture the vehicle license plate by only the front ground induction coil 1. This may result in the vehicle being overloaded and the information about the vehicle being undetermined. Based on this, another implementation manner 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 roadway in front of the piezoelectric film weighing sensor 4 according to the advancing direction of the vehicle; the rear ground induction coil 6 is connected with the control unit 10.
Or when the narrow-plate load cell 5 is included in the above embodiment, the embodiment of the above embodiment further includes:
the rear ground induction coil 6 is buried under the roadway 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 a 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;meanwhile, the invention can also measure the vehicle speed v 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 coil2Speed v of the vehicle2For the above-mentioned vehicle speed v1And (6) checking.
An overrun condition may also occur in view of the fact that the vehicle will not only experience an overload condition. 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 rod 7, a vehicle length and height laser measuring unit 8 and a vehicle height and width laser measuring unit 9;
the L-shaped rod 7 is arranged at a certain distance from 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 a 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 a control unit 10.
According to the structure of the vehicle detection device, whether the vehicle is out of limit can be judged through the vehicle length and height laser measuring unit 8 and the vehicle height and width laser measuring unit 9.
The vehicle length and height laser measuring unit 8 scans along the vehicle advancing direction, the scanning surface is perpendicular to the road, after the vehicle leaves the vehicle overload measuring device, for example, after the vehicle leaves the rear ground sensing coil 6, the vehicle detecting device starts to record the laser scanning data of the vehicle length and height laser measuring unit 8, and after the vehicle leaves the L-shaped rod 7, the vehicle detecting device finishes recording the laser scanning data of the vehicle length and height laser measuring unit 8. Acquiring the distance l between the surface point of the vehicle and the length and height of the vehicle according to the data of each scanning surface of the vehicle body scanned by the length and height laser measuring unit 85And an angle alpha, wherein alpha ranges from-5 deg. to 185 deg.. According to the distance l5Angle alpha and vehicle length, mounting height h of height laser measuring unit 81Calculating vehicle height data hLong and longAnd lengthData L:
hlong and long＝max(h1-l5·cosα),
L＝max(l5·sinα)-min(l5·sinα)
The principle can be briefly summarized that the recorded data of each scanning surface scanned to the car body are calculated one by one, and the height data h of the car is takenLong and longThe maximum value of (2) is taken as vehicle height data, and the maximum value of the vehicle length data L is taken as vehicle length data.
The vehicle height and width laser measuring unit 9 scans along the lateral 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 rod 7, the vehicle detection 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 rod 7, the vehicle detection device finishes recording the laser scanning data of the vehicle height and width laser measuring unit 9. Acquiring the distance l between the surface point of the vehicle and the laser measuring unit 9 for measuring the height and the width of the vehicle according to the data of each scanning surface of the vehicle body scanned by the laser measuring unit 9 for measuring the height and the width of the vehicle6And an angle beta, wherein the range of beta is-5-185 degrees, and the angle corresponding to the point actually scanned to the vehicle body is taken as the standard. According to the distance l6Angle beta and mounting height h of laser measuring unit 9 for vehicle height and width2Calculating vehicle height data hWidth ofAnd width data L1:
hWidth of＝max(h2-l6·cosβ),
L1＝max(l6·sinβ)-min(l6·sinβ)
The principle can be briefly summarized that the recorded data of each scanning surface scanned to the car body are calculated one by one, and the height data h of the car is takenWidth ofThe maximum value of (2) is taken as vehicle height data, and vehicle width data L is taken1The maximum value of (a) is used 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 comparedThe large value is taken as the final result of the vehicle height. For the vehicle length, width and height data 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 41After the correction, the accurate measurement results of the length, width and height of the vehicle can be obtained.
Example 2:
the present embodiment is to provide a vehicle detection method, which operates using the vehicle detection device provided in embodiment 1. The principle is that the vehicle wheel track sensor 3 is used for acquiring the running track of the vehicle wheel, and the vehicle weight measurement result is corrected according to the running track of the vehicle wheel, so that the high-precision vehicle weight measurement result is acquired. The vehicle detection method comprises the following steps:
step A1: calculating to obtain an axle load signal of a running vehicle according to output signals of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4;
wherein, 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 21；
Step A1.2: calculating to obtain a vehicle axle load signal m according to the output signal of the piezoelectric film weighing sensor 42；
Step A1.3: according to the vehicle axle weight signal m2For vehicle axle load signal m1Checking when the vehicle axle weight signal m2And vehicle axle weight signal m1When the error of the test data exceeds the limited range, the vehicle axle weight signal m2And vehicle axle weight signal m1If the vehicle detection device is invalid, recording a log and giving an early warning to prompt that the vehicle detection device is abnormal; when the vehicle axle weight signal m2And vehicle axle weight signal m1When the error of the test data is in the limited range, the test data is valid, and the vehicle axle weight signal m is used for1The standard is.
Step A2: calculating to obtain an 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 wheel track sensor 3, and correcting the total weight M of the vehicle according to the vehicle running track to obtain the corrected total weight of the vehicle;
the method for acquiring the vehicle driving track in the step a4 may specifically be:
step A4.1: acquiring the moment t when the wheel passes through the piezoelectric quartz weighing sensor 21Time t when the wheel passes the wheel track sensor 32And the moment t when the wheel passes the piezoelectric film weighing sensor 43；
Step A4.2: according to the installation distance l of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 41And calculating the distance between the piezoelectric quartz weighing sensor 2 and the vehicle wheel track sensor 3 by utilizing linear interpolation, wherein the calculation formula is as follows:
wherein l represents the distance between the electric quartz weighing sensor 2 and the vehicle wheel track sensor 3, and t1Represents the moment, t, at which the wheel passes the piezoelectric quartz weighing cell 22Indicating the moment, t, at which the wheel passes the wheel track sensor 33Indicating the moment at which the wheel passes the piezo-electric film load cell 4, l1The installation distance of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 is shown;
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 utilizing a triangular similarity principle, and the calculation formula is as follows:
wherein l2The distance between the position of a wheel passing through the quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 and one end of the lane, particularly the left end or the right end of the lane is measured by a vehicle wheel track sensor 3The specific mode of the angle line connection is determined, l represents the distance between the quartz weighing sensor 2 and the vehicle wheel track sensor 3, and l represents the distance between the quartz weighing sensor and the vehicle wheel track sensor1The installation distance of the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4 is shown, a represents the lane width, and t represents1Represents the moment, t, at which the wheel passes the piezoelectric quartz weighing cell 22Indicating the moment, t, at which the wheel passes the wheel track sensor 33Indicating the moment when the wheel passes the piezo film load cell 4.
Step A5: and judging the total weight of the vehicle after the correction, determining whether the vehicle is overloaded, and storing the judgment information to the vehicle overload and overrun server 11.
Example 3
The present embodiment is to provide a vehicle detection method, which operates using the vehicle detection device provided in embodiment 1. The principle is that the vehicle speed is obtained according to the vehicle detection device, and the vehicle weight measurement result is corrected according to the vehicle speed, so that the high-precision vehicle weight measurement result is obtained. The vehicle detection method comprises the following steps:
step B1: calculating to obtain the axle load signal of the running vehicle according to the piezoelectric quartz weighing sensor 2 and the piezoelectric film weighing sensor 4, and calculating to obtain the vehicle speed v1；
Step B1 calculating the vehicle speed v1The method of (2) may further comprise:
step B1.1: calculating the vehicle speed v according to the time when the wheel passes through the piezoelectric quartz weighing sensor 2, 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 41；
Step B1.2: calculating the speed v of the vehicle according to the time when the vehicle passes through the front and rear ground induction coils and the installation distance between the front and rear ground induction coils2；
Step B1.3: using vehicle speed v2For vehicle speed v1Checking, and when the error of the test data of the vehicle speed v and the vehicle speed v exceeds a limited range2With the speed v of the vehicle1The test data is invalid, and a log is recorded and early-warning is given to prompt that the vehicle detection device is abnormal; when the error of the test data of the two is in a limited rangeTest data valid at vehicle speed v1The standard is.
Step B2: calculating to obtain an 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 vehicle speed v1Correcting the total weight M of the vehicle to obtain the corrected total weight of the vehicle;
the step B4 may specifically be:
step B4.1: calculating the vehicle axle weight G according to the following formula:
G＝k·S·v
wherein k represents the weight coefficient, S represents the curve area of the vehicle in the process of running through the piezoelectric quartz weighing sensor 2, and v represents the vehicle speed v1(ii) a Wherein the weight coefficient k varies with the vehicle speed v;
step B4.2: 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 vehicleVehicle speedBased on the total weight M of the vehicle calculated from the axle weight signal G of the vehicleVehicle speedAnd correcting the total vehicle weight M to obtain the corrected total vehicle weight.
Step B5: and judging the corrected total weight of the vehicle, determining whether the vehicle is overloaded, and storing the judgment information to the vehicle overload and overrun server 11.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A vehicle detection device 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 wheel track sensor (3) and a piezoelectric film weighing sensor (4);
the piezoelectric quartz weighing sensor (2) is transversely buried under the road surface of the lane;
the front ground induction coil (1) is buried under the lane road surface 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 advancing direction of a vehicle, and the piezoelectric film weighing sensor (4) is parallel to the piezoelectric quartz weighing sensor (2);
the vehicle wheel track sensor (3) is connected with the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4) according to diagonal lines;
the front ground induction coil (1), the piezoelectric quartz weighing sensor (2), the vehicle wheel 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 and overrun server (11); and 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 load of the wheel through the vehicle wheel track sensor (3).
2. A vehicle detecting device according to claim 1, characterized in that: replacing a 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. A vehicle detecting device according to claim 1, characterized in that: the overload measuring device also comprises a narrow plate type weighing sensor (5), wherein the narrow plate type weighing sensor (5) is transversely embedded under the roadway in front of the piezoelectric film weighing sensor (4) according to the advancing direction of a vehicle; the narrow plate type weighing sensor (5) is connected with the control unit (10).
4. A vehicle detecting device according to claim 1, characterized in that: the overload measuring device also comprises a rear ground induction coil (6);
the rear ground induction coil (6) is transversely embedded under a lane road surface in front of the piezoelectric film weighing sensor (4) according to the advancing direction of the vehicle; the rear ground induction coil (6) is connected with the control unit (10).
5. A vehicle detecting device 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 the roadway surface in front of the narrow plate type weighing sensor (5) in the advancing direction of the vehicle; the rear ground induction coil (6) is connected with the control unit (10).
6. A vehicle detecting device according to claim 1, characterized in that: the system also comprises an overrun measuring device, wherein the overrun measuring device comprises an L rod (7), a vehicle length and height laser measuring unit (8) and a vehicle height and width laser measuring unit (9);
the L-shaped rod (7) is arranged at a certain distance from 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 a 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).
7. A vehicle detection method, characterized by comprising the steps of:
calculating to obtain an axle load signal of a running vehicle according to output signals of the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4);
calculating to obtain an axle number signal of each vehicle according to an 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 a vehicle wheel track sensor (3), and correcting the total weight M of the vehicle according to the vehicle running track to obtain the corrected total weight of the vehicle;
and judging the total weight of the vehicle after correction, determining whether the vehicle is overloaded, and storing judgment information to a vehicle overload and overrun server (11).
8. The vehicle detection method according to claim 7, wherein the calculating of the axle weight signal of the running vehicle according to the output signals of the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4) specifically comprises:
calculating to obtain a vehicle axle load signal m according to the output signal of the piezoelectric quartz weighing sensor (2)1；
Calculating to obtain a vehicle axle load signal m according to the output signal of the piezoelectric film weighing sensor (4)2；
According to the vehicle axle load signal m2For the vehicle axle load signal m1Checking when the vehicle axle load signal m is2And the vehicle axle weight signal m1When the error of the test data exceeds the limited range, the vehicle axle weight signal m2And the vehicle axle weight signal m1If the vehicle detection device is invalid, recording a log and giving an early warning to prompt that the vehicle detection device is abnormal; when the vehicle axle load signal m2And the vehicle axle weight signal m1When the error of the test data is in a limited range, the test data is valid, and the vehicle axle weight signal m is used for1The standard is.
9. A vehicle detection method, characterized by comprising the steps of:
calculating to obtain an axle load signal of a running vehicle according to the piezoelectric quartz weighing sensor (2) and the piezoelectric film weighing sensor (4), and calculating to obtain a vehicle speed v1；
Calculating to obtain an axle number signal of each vehicle according to an 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;
and judging the total weight of the vehicle after correction, determining whether the vehicle is overloaded, and storing judgment information to a vehicle overload and overrun server (11).
10. The vehicle detection method according to claim 9, wherein the step of correcting the total vehicle weight according to the vehicle speed to obtain a corrected total vehicle weight specifically includes:
calculating the vehicle axle weight G according to the following formula:
G＝k·S·v
wherein k represents the weight coefficient, S represents the curve area of the vehicle in the process of running through the piezoelectric quartz weighing sensor (2), and v represents the vehicle speed v1(ii) a 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 vehicleVehicle speedBased on the total vehicle weight M calculated from the axle weight signal G of the vehicleVehicle speedAnd correcting the total vehicle weight M to obtain the corrected total vehicle weight.
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