CN212646991U

CN212646991U - Single-side light curtain vehicle type recognition device based on TOF laser ranging sensor

Info

Publication number: CN212646991U
Application number: CN202021143357.2U
Authority: CN
Inventors: 陈武英; 杨彬; 于峰
Original assignee: Suzhou Runwell Control Technology Co ltd
Current assignee: Suzhou Runwell Control Technology Co ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-03-02
Anticipated expiration: 2030-06-19

Abstract

The utility model discloses a unilateral light curtain vehicle model recognition device based on TOF laser rangefinder sensor, including box, host system and the TOF laser rangefinder sensor who is used for parallel range finding of setting to the side of the box, TOF laser parallel rangefinder sensor links to each other with host system and a plurality of along the direction of height setting of box side, its characterized in that: the box body is provided with at least one group of oblique-shooting distance measuring modules connected with the main control module, each group of oblique-shooting distance measuring modules comprise two TOF laser oblique-shooting distance measuring sensors with the same inclination angle and opposite inclination directions, and the horizontal distance between the laser intersection points sent by the two TOF laser oblique-shooting distance measuring sensors and the box body is 2-3 meters. The utility model discloses constitute by the parallel ground light beam of multiunit and at least two sets of beams that penetrate to one side. Each light beam presents a conical light spot, a plurality of light beams are spliced to form a section detection area, and false detection and missing detection are effectively avoided by the mode of splicing the plurality of groups of parallel light beams and at least two groups of oblique light beams.

Description

Single-side light curtain vehicle type recognition device based on TOF laser ranging sensor

Technical Field

The utility model belongs to the technical field of vehicle type identification equipment, concretely relates to unilateral light curtain vehicle model recognition device based on TOF laser rangefinder sensor.

Background

Along with the development of economy, roads in China develop rapidly, the popularization rate of ETC is improved year by year in recent years, along with the implementation of truck ETC, the requirements on the detection accuracy and the detection speed of an original vehicle detection system are also improved, and the response speed and the shunting accuracy of an ETC lane cannot be achieved by an original coil detector.

At present, a vehicle separator used in a highway toll station is mainly a correlation grating vehicle separator, but because the grating vehicle separator adopts a correlation detection principle, a light emitting tube array and a receiving tube array are required to be respectively installed on safety islands at two sides of a lane and aligned; the detection range of the grating vehicle separator can not be adjusted after the grating vehicle separator is installed and fixed, the construction and maintenance difficulty is high, and the cost is high. In addition, some existing vehicle separation and typing devices adopting sector scanning laser have high manufacturing cost and are greatly influenced by the environment, and when a small object is shielded close to one side of the scanning head, the scanning result is greatly influenced.

The prior art at least has the following technical problems: for a truck with a trailer, when the trailer joint is small, the problem of missed detection exists in the correlation grating, and one vehicle can be judged to be two vehicles.

Disclosure of Invention

The to-be-solved problem of the utility model is to provide a unilateral light curtain vehicle model recognition device based on TOF laser rangefinder sensor, effectively avoid the false retrieval and miss detection through setting up the oblique distance measuring module.

In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a unilateral light curtain vehicle model recognition device based on TOF laser rangefinder sensor, is in including box, setting host system and setting in the box are in the TOF laser rangefinder sensor that is used for parallel range finding of box side, TOF laser parallel rangefinder sensor with host system links to each other and follows a plurality of, its characterized in that of the direction of height setting of box side: the box body is provided with at least one group of oblique-shooting distance measuring modules connected with the main control module, each group of oblique-shooting distance measuring modules comprise two TOF laser oblique-shooting distance measuring sensors with the same inclination angle and opposite inclination directions, and the horizontal distance between the laser intersection points sent by the two TOF laser oblique-shooting distance measuring sensors and the box body is 2-3 m.

Further, the edges of light spots formed by two adjacent TOF laser parallel distance measuring sensors at a position 1m away from the box body horizontally coincide.

Further, a power supply module, a temperature sensor, a humidity sensor, a heating device, a dehumidifying device, a refrigerating device and a ventilating device which are connected with the main control module are further arranged in the box body.

The utility model discloses based on TOF (time of flight) time of flight principle, adopt multiunit laser rangefinder module to the synchronous fast scan of same section, the vehicle has or not in the detection zone, realizes vehicle separation and shaft recognition function. The light curtain consists of a plurality of groups of parallel ground light beams and at least two groups of oblique light beams in the working process. Each light beam presents a conical light spot, a plurality of light beams are spliced to form a section detection area, and false detection and missing detection are effectively avoided by the mode of splicing the plurality of groups of parallel light beams and at least two groups of oblique light beams. The vehicle separation is realized, the type judgment and wheel axle identification functions are realized, and the installation and the maintenance are convenient.

The present invention will be described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic view of the internal structure of the present invention;

fig. 2 is a schematic perspective view of the present invention.

In the drawings: the system comprises a box body 1, a main control module 2, a TOF laser parallel distance measurement sensor 3, a TOF laser oblique-shooting distance measurement sensor 4, a power module 5, a temperature sensor 6, a humidity sensor 7, a heating device 8, a dehumidifying device 9, a refrigerating device 10 and a ventilating device 11.

Detailed Description

The utility model provides a unilateral light curtain vehicle model recognition device based on TOF laser rangefinder sensor, including box 1, the host system 2 of setting in box 1 and set up the TOF laser parallel rangefinder sensor 3 who is used for parallel range finding to the side of box 1, TOF laser parallel rangefinder sensor 3 links to each other with host system 2 and a plurality of along the direction of height setting of box 1 side, and the key lies in: at least one group of oblique-shooting distance measuring modules connected with the main control module 2 are arranged on the box body 1, each group of oblique-shooting distance measuring modules comprise two TOF laser oblique-shooting distance measuring sensors 4 with the same inclination angle and opposite inclination directions, and the horizontal distance between the laser intersection points sent by the two TOF laser oblique-shooting distance measuring sensors 4 and the box body 1 is 2-3 meters.

The ranging sensors all comprise a laser emitting unit, a laser receiving unit, a lens, a control circuit and a data transmission unit, wherein the data transmission unit is connected with the main control module 2 through I2C (but not limited to I2C, and other communication modes can be used). The main working principle of the distance measuring sensor is that a laser emitting unit periodically emits a medium infrared light modulation wave outwards, the modulation wave is reflected after meeting an object, the product obtains the flight time by measuring the round-trip phase difference of the modulation wave, and then the relative distance between the product and a measured target is calculated.

The TOF laser parallel ranging sensors 3 are all installed in parallel to the ground to form a group of light curtain walls perpendicular to the ground, and the main control module 2 calculates whether vehicles pass through an area or not by simultaneously processing distance information detected by each ranging module on a section; because the plurality of groups of sensors are arranged in parallel, when a certain distance measuring sensor has a problem or is detected abnormally, the whole detection result is not influenced.

The laser beam emitted by the TOF laser parallel ranging sensor 3 passes through the transmitting lens and then becomes a conical light path; form a circular facula at a certain distance, the detection thing homoenergetic that is covered by the facula scope has distance output, and two adjacent ranging module coincide at the facula border that distance 1m department formed to laser light curtain vehicle separation and shaft recognizer realize detecting the object full coverage outside the distance 1m, thereby guarantee that the trailer's of some trailers is hung and can not be differentiateed for two cars by normal detection.

The TOF laser parallel distance measurement sensors 3 parallel to the ground are installed non-uniformly and arranged densely in the direction close to the ground to form a group of dense light curtain walls, and when a vehicle passes through the identifier, the main control module 2 draws a three-dimensional image with the side face of the vehicle through the returned distance information of each distance measurement module, so that the axle of the vehicle is judged and identified through a matched algorithm.

The oblique incidence ranging module is used for supplementing the detection of the laser parallel ranging sensor, and the condition of missing detection is guaranteed not to occur. The oblique-incidence distance measuring modules are at least two groups, and each group comprises two TOF laser oblique-incidence distance measuring sensors 4. One TOF laser oblique shooting distance measuring sensor 4 is arranged at the lower part of the grating and is about 20cm away from the ground, and the direction of the TOF laser oblique shooting distance measuring sensor 4 is obliquely upward, and the other TOF laser oblique shooting distance measuring sensor 4 is arranged at the upper part of the grating and is about 20cm away from the top; the light that two TOF laser strabismus distance measuring sensors 4 sent is in the coincidence (about the road intermediate position) of 2-3m department apart from the box level to guarantee that the tiny junction of trailer also can detect.

The box body 1 is also internally provided with a power supply module 5, a temperature sensor 6, a humidity sensor 7, a heating device 8, a dehumidifying device 9, a refrigerating device 10 and a ventilating device 11 which are connected with the main control module 2. The power module 5 is arranged in the middle of the inner side wall of the box body 1. The temperature sensor 6 and the humidity sensor 7 are an integral piece and are disposed below the power module 5. Heating device 8 adopts the mode of heating wire heating, is the strip and is provided with two side by side, and TOF laser parallel ranging sensor 3 and TOF laser oblique-fire ranging sensor 4 all are located between two heating strips. The dehumidifying device 9 is disposed at the bottom of one of the side walls of the cabinet 1. The refrigerating apparatus 10 is provided at the top of the cabinet 1. The ventilating device 11 is provided at an upper portion of one of the side walls of the cabinet 1. The box body 1 is provided with a dehumidification hole, a ventilation hole and the like which are matched with the device. Gather temperature and humidity data in the box 1 through temperature sensor 6 and humidity transducer 7, main control module 2 judges according to the data of gathering and opens one or more in heating device 8, dehydrating unit 9, refrigerating plant 10 and ventilation unit 11 to guarantee that sensor and other parts work in certain temperature and humidity, and then guarantee stable work.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims

1. The utility model provides a unilateral light curtain vehicle model recognition device based on TOF laser rangefinder sensor, is in including box (1), setting host system and setting in box (1) are in TOF laser rangefinder sensor (3) that are used for parallel range finding of box (1) side, TOF laser parallel rangefinder sensor (3) with host system (2) link to each other and follow a plurality of, its characterized in that of the direction of height setting of box (1) side: the range finding device is characterized in that at least one group of range finding modules connected with the main control module (2) is arranged on the box body (1), each group of range finding modules comprises two TOF laser range finding sensors (4) with the same inclination angle and the opposite inclination directions, and the laser intersection points sent by the two TOF laser range finding sensors (4) are 2-3 meters away from the horizontal distance of the box body (1).

2. The single-side light curtain vehicle type recognition device based on the TOF laser ranging sensor as claimed in claim 1, wherein: the two adjacent TOF laser parallel distance measuring sensors (3) are horizontally away from the light spot edge formed at 1m of the box body (1) to be overlapped.

3. The single-side light curtain vehicle type recognition device based on the TOF laser ranging sensor as claimed in claim 1, wherein: the refrigerator is characterized in that a power module (5), a temperature sensor (6), a humidity sensor (7), a heating device (8), a dehumidifying device (9), a refrigerating device (10) and a ventilating device (11) which are connected with the main control module (2) are further arranged in the box body (1).