A traffic light for intelligent transportation and its control method

Abstract

This application discloses a traffic signal light for intelligent transportation and its control method, including a mounting frame, connecting beams, multiple signal light heads, and multiple rotating units. Each rotating unit is equipped with a data acquisition mounting base or millimeter-wave radar, and the data acquisition mounting base is equipped with an image acquisition unit and a laser ranging sensor. This traffic signal light enables intelligent control, allowing the green light to be turned off promptly when there are no vehicles on the road, thus freeing up road resources. The judgment is made using both millimeter-wave radar and laser ranging sensors, resulting in more accurate determinations of the absence of vehicles on the road. Furthermore, the millimeter-wave radar, image acquisition units, and laser ranging sensors can be cleaned. The entire structure is also more robust, with the connecting beams and reinforcing beams forming a unified structure less prone to deformation.

Description

Technical Field

[0001] This invention relates to the field of traffic signal technology, and more specifically, to a traffic signal for intelligent transportation and its control method. Background Technology

[0002] In urban traffic management systems, traffic lights are signaling devices used to direct traffic flow, typically installed at intersections or other locations requiring traffic control. Through combinations of different colored lights, they issue clear instructions to vehicles and pedestrians to proceed or stop, thereby ensuring orderly traffic flow and reducing traffic accidents.

[0003] Existing traffic lights lack intelligent control programs; regardless of actual traffic flow, they switch according to pre-set durations. At certain times, even when the light is green, there are no vehicles waiting to cross. Green light time that could be allocated to other intersections or directions with greater need for passage is wasted. This waste of green light time prevents effective relief of traffic pressure on other road sections, easily triggering a chain reaction of traffic congestion and reducing the overall efficiency of the traffic system. In the long run, this also negatively impacts the city's traffic image and reduces residents' satisfaction with urban traffic management. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a traffic signal light and its control method for intelligent transportation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a traffic signal light, comprising a mounting frame, a cylindrical connecting beam, multiple signal light heads, and multiple rotating units, wherein a data acquisition mounting base or millimeter-wave radar is mounted at the rotating unit, and an image acquisition unit and a laser ranging sensor are mounted at the data acquisition mounting base; the rotating unit comprises two fixed parts and a rotating part, wherein the fixed parts include a fixing ring, a fixing block, a first motor, and a drive gear, and the rotating part includes a rotating cylinder and two gear rings.

[0006] Furthermore, the signal light head is fixed to the mounting frame.

[0007] Furthermore, multiple rotating units are installed at the connecting crossbeam.

[0008] Furthermore, the rotating part is located between the two fixed parts.

[0009] Furthermore, the fixing ring is fixed to the connecting crossbeam.

[0010] Furthermore, the fixing block is fixedly connected to the fixing ring.

[0011] Furthermore, the first motor is mounted on the fixed block, and the drive gear is driven by the first motor.

[0012] Furthermore, the rotating cylinder is an annular cylindrical shape.

[0013] Furthermore, the rotating cylinder is passed through by a connecting beam.

[0014] Furthermore, the two gear rings are fixed to both ends of the rotating cylinder.

[0015] This makes it easier to drive the rotating cylinder to rotate.

[0016] Furthermore, the fixing ring is a fixing ring with a notch, and the fixing ring has a plurality of locking bolts that lock the fixing ring to the position of the connecting beam.

[0017] Furthermore, each retaining ring has two or more locking bolts.

[0018] Furthermore, there are three rotating units, including two first rotating units and one second rotating unit.

[0019] Furthermore, two acquisition mounting bases are installed at the rotating cylinder of the first rotating unit, and a rotating base is fixed at the rotating cylinder of the second rotating unit, with two millimeter-wave radars installed at the rotating base.

[0020] Furthermore, the second rotating unit is located between the two first rotating units.

[0021] Furthermore, the first rotating unit has two acquisition mounting bases, one of which is used as the image acquisition unit and laser rangefinder sensor, and the other is used as a backup image acquisition unit and laser rangefinder sensor.

[0022] Furthermore, the second rotating unit has two millimeter-wave radars, one of which is the active millimeter-wave radar and the other is a backup millimeter-wave radar.

[0023] Therefore, the image acquisition unit, laser rangefinder, and millimeter-wave radar are all backed up, so that even if one is damaged, it will not affect the normal operation of the traffic lights.

[0024] Furthermore, the two acquisition mounting seats at the rotating cylinder of the first rotating unit are installed back to back.

[0025] Furthermore, the two millimeter-wave radars at the rotating cylinder of the second rotating unit are installed back to back.

[0026] Furthermore, the two acquisition mounting bases are installed 180 degrees apart at the rotating cylinder.

[0027] Furthermore, the two millimeter-wave radars are installed 180 degrees apart at the rotating cylinder.

[0028] Furthermore, the mounting frame includes two side plates and a connecting top plate fixed between the two side plates.

[0029] Furthermore, the traffic light also includes a cleaning unit, which includes a horizontal slide rail fixed to the top plate, a second motor mounted on one side plate, a bearing mounted on the other side plate, a lead screw connecting the second motor and the bearing, a slide block mounted on the horizontal slide rail, and an airflow generating unit mounted on the slide block. The slide block has a threaded hole through which the lead screw passes, and the airflow generating unit is connected to a nozzle.

[0030] Furthermore, the slide includes a sliding block and a mounting plate fixedly connected to the sliding block, the airflow generating unit is fixed at the mounting plate, the nozzle is an L-shaped nozzle, the nozzle is fixedly connected to the airflow generating unit and passes through the mounting plate.

[0031] Furthermore, the airflow generating unit includes a housing with an air inlet and a fan unit installed inside the housing.

[0032] This allows for the blowing and cleaning of millimeter-wave radar, image acquisition units, and laser rangefinders.

[0033] Furthermore, it also includes a positioning reinforcement unit, two lifting drive units, and two cleaning units; the positioning reinforcement unit includes a reinforcing beam and two lifting seats, the lifting drive unit includes a first fixed seat, a vertical slide rail, and an electric lifting rod connecting the first fixed seat and the reinforcing beam; the connecting beam has a positioning blind hole, and the lifting seat is fixed with a positioning support column; the cleaning unit includes a cleaning container with an open top fixed to the reinforcing beam, an ultrasonic generating unit, a liquid storage container, a waste liquid container, an inlet pipe connecting the cleaning container and the liquid storage container, a drain pipe connecting the cleaning container and the waste liquid container, an inlet valve installed at the inlet pipe, a drain valve installed at the drain pipe, an inlet pump installed at the inlet pipe, and a drain pump installed at the drain pipe.

[0034] Furthermore, both the inlet valve and the outlet valve are solenoid valves.

[0035] Furthermore, a protruding edge is fixed at the acquisition mounting base.

[0036] Furthermore, a first liquid level sensor is installed inside the cleaning container.

[0037] Furthermore, a second liquid level sensor is installed inside the liquid storage container.

[0038] Furthermore, when the electric lifting rod is at its first length, the positioning support column is inserted into the positioning blind hole.

[0039] Furthermore, when the electric lifting rod is at its second length, the positioning support column disengages from the positioning blind hole.

[0040] Furthermore, the first length is greater than the second length.

[0041] The positioning support column is inserted into the positioning blind hole to support the connecting beam.

[0042] Furthermore, the two lifting seats are fixed to the reinforcing crossbeam.

[0043] Furthermore, the first fixing seat is fixed to the side plate, and the vertical slide rail is fixed to the side plate.

[0044] Furthermore, the positioning support column can be inserted into the positioning blind hole.

[0045] Furthermore, the ultrasonic generating unit is installed inside the cleaning container.

[0046] Furthermore, the liquid storage container is fixed to the side plate.

[0047] Furthermore, the waste liquid container is fixed to the side plate.

[0048] Furthermore, the convex edge is rectangular and can abut against the top of the cleaning container for sealing.

[0049] Furthermore, the top of the cleaning container has a rectangular frame-shaped sealing gasket.

[0050] This allows for a good seal between the protruding edge of the mounting base and the cleaning container.

[0051] Furthermore, the inlet pipe includes a first rigid pipe connected to the cleaning container, a second rigid pipe connected to the storage container, and a first connecting hose (not shown in the accompanying drawings) connecting the first rigid pipe and the second rigid pipe.

[0052] Furthermore, both the inlet valve and the inlet pump are installed at the first rigid pipe.

[0053] Furthermore, the drain pipe includes a third rigid pipe connected to the cleaning container, a fourth rigid pipe connected to the waste liquid container, and a second connecting hose (not shown in the accompanying drawings) connecting the third rigid pipe and the fourth rigid pipe.

[0054] Furthermore, both the drain valve and the drain pump are installed at the third rigid pipe.

[0055] Furthermore, the cleaning unit also includes a second fixed base fixed to the reinforcing beam, a first electric telescopic rod installed on the second fixed base, and an L-shaped cover driven by the first electric telescopic rod, the cover being able to close the top opening of the cleaning container.

[0056] Furthermore, the mounting frame also includes two strip baffles that are fixedly connected to the top plate and the two side plates.

[0057] Furthermore, two U-shaped frames are fixed at the mounting frame; two limiting holes are provided at the lifting seat; and two second electric telescopic rods are fixed at the U-shaped frames, the movable ends of which can be inserted into the limiting holes.

[0058] Furthermore, the U-shaped frame is fixedly connected to both strip baffles.

[0059] Furthermore, the U-shaped frame includes a bottom plate and two connecting plates that connect the bottom plate and the strip baffle.

[0060] Furthermore, when the electric lifting rod is at its second length, the lifting seat abuts against the bottom plate.

[0061] Furthermore, fixed flanges are fixed at both ends of the connecting beam, and the fixed flanges are fixedly connected to the side plate.

[0062] Furthermore, a control box is installed on one of the side panels, and the control box contains a control unit and a wireless communication unit.

[0063] Furthermore, the traffic light can be in a working state, in which each positioning support column is inserted into the corresponding positioning blind hole, and the movable end of each second electric telescopic rod is inserted into the corresponding limiting socket.

[0064] Furthermore, in the aforementioned working state, the electric lifting rod is at its first length.

[0065] Furthermore, in the operating state, the cleaning container is covered by the lid.

[0066] This application also discloses a control method for traffic lights for intelligent transportation based on any one of the above claims, the control method including a signal duration adjustment operation, the signal duration adjustment operation including the following steps:

[0067] 1) Is the traffic light green? If so, proceed to step 2).

[0068] 2) Within the set distance from the mounting frame, does the millimeter-wave radar detect no vehicles? If so, proceed to step 3).

[0069] 3) Within the set distance from the mounting frame, does the laser rangefinder detect no vehicle? If so, proceed to step 4).

[0070] 4) Is the remaining green light duration greater than or equal to the set duration? If so, proceed to step 5).

[0071] 5) This causes the green light to immediately enter a 3-second countdown.

[0072] Further, in step 3), within a set distance from the mounting frame, the detection result of the laser rangefinder at each first rotating unit is checked to see if there is no vehicle; if so, proceed to step 4).

[0073] Furthermore, the set distance is 30 meters.

[0074] Furthermore, the set duration is 10 seconds.

[0075] Furthermore, the control unit controls the traffic lights to perform the duration adjustment operation once at a set interval.

[0076] Furthermore, the set interval is 2 seconds.

[0077] Furthermore, the control method includes a cleaning step, in which the electric lifting rod descends from a first length to a second length, and cleaning fluid is injected into the cleaning container so that one of the acquisition mounting seats of the first rotating sleeve faces the cleaning container. The inlet pump and inlet valve are closed, and then the electric lifting rod extends to the first length. Each acquisition mounting seat is inserted into the corresponding cleaning container and the protrusion abuts and seals with the top of the cleaning container. The ultrasonic generating unit is then turned on.

[0078] Furthermore, the control method includes a detection step, in which, after the cleaning operation is completed, the liquid inlet valve and the liquid inlet pump are opened, and if the second liquid level sensor detects that the liquid level in the storage container continues to drop, it is determined that a malfunction has occurred.

[0079] Furthermore, the control method includes a cleaning step, in which the electric lifting rod is at its second length, and the image acquisition unit, laser rangefinder sensor, and millimeter-wave radar are cleaned by airflow from the nozzle.

[0080] Furthermore, the rotating cylinder at the first rotating unit is the first rotating cylinder, and the rotating cylinder at the second rotating unit is the second rotating cylinder.

[0081] Furthermore, in the cleaning step, the connection between the two acquisition mounting bases of the first rotating cylinder is in a horizontal state; the connection between the two millimeter-wave radars of the second rotating cylinder is in a horizontal state.

[0082] Furthermore, in the cleaning step, the airflow ejected from the nozzle first cleans the acquisition mounting base on one side of the first rotating cylinder and the millimeter-wave radar on the other side of the second rotating cylinder. Then, the first and second rotating cylinders are both rotated 180 degrees, and the airflow ejected from the nozzle cleans the acquisition mounting base on the other side of the first rotating cylinder and the millimeter-wave radar on the other side of the second rotating cylinder.

[0083] Beneficial effects: 1. The traffic light of this application can achieve intelligent control. When there are no vehicles on the road, even though it is green, the green light can be turned off in time, thereby freeing up road resources.

[0084] 2. The traffic light of this application uses both millimeter-wave radar and laser rangefinder sensors for determination, which makes the determination of whether there are vehicles on the road more accurate.

[0085] 3. The traffic signal light of this application has a more stable overall structure, and the whole formed by the connecting beam and the reinforcing beam is not easily deformed.

[0086] 4. The traffic light of this application can clean the millimeter-wave radar, image acquisition unit and laser rangefinder, and can also clean the image acquisition unit and laser rangefinder. Attached Figure Description

[0087] Figure 1 This is a schematic diagram of a traffic light in operation.

[0088] Figure 2 This is a magnified view of region A;

[0089] Figure 3 This is a magnified view of region B.

[0090] Figure 4 This is a magnified view of region C;

[0091] Figure 5 A schematic diagram showing the second electric telescopic rod retracting from the limiting socket.

[0092] Figure 6 This is a magnified view of region D;

[0093] Figure 7 A schematic diagram showing the positioning support column descending from the positioning blind hole;

[0094] Figure 8 This is a magnified view of region E.

[0095] Figure 9 A diagram illustrating the removal of the lid from above the cleaning container;

[0096] Figure 10 This is a magnified view of region F;

[0097] Figure 11 This is a diagram illustrating the cleaning operation.

[0098] Figure 12 This is a magnified view of region G;

[0099] Figure 13 This is a diagram illustrating the cleaning operation.

[0100] Figure 14 This is a magnified view of region H.

[0101] Explanation of reference numerals in the attached drawings: Mounting frame 1; Side plate 1.1; Connecting top plate 1.2; Strip baffle 1.3; U-shaped frame 1.4; Bottom plate 1.4.1; Connecting plate 1.4.2; Second electric telescopic rod 1.5; Connecting crossbeam 2; Positioning blind hole 2.1; Fixing flange 2.2; Signal light head 3; Fixing ring 4.1; Fixing block 4.2; First motor 4.3; Drive gear 4.4; Rotating cylinder 4.5; Gear ring 4.6; Acquisition mounting base 5; Image acquisition unit 5.1; Laser rangefinder sensor 5.2; Protruding edge 5.3; Rotating seat 6; Millimeter-wave radar 6.1; Second motor 7.1; Lead screw 7.2; Slide 7 7.3; Airflow generating unit; 7.4; Nozzle; 7.5; Reinforcing crossbeam; 8.1; Lifting seat; 8.2; Limiting insertion hole; 8.2.1; Positioning support column; 8.3; First fixed seat; 9.1; Vertical slide rail; 9.2; Electric lifting rod; 9.3; Cleaning container; 10.1; Liquid storage container; 10.2; Waste liquid container; 10.3; Inlet pipe; 10.4; Inlet valve; 10.4.1; Inlet pump; 10.4.2; Drain pipe; 10.5; Drain valve; 10.5.1; Drain pump; 10.5.2; Second fixed seat; 10.6; First electric telescopic rod; 10.7; Cover; 10.8; Sealing gasket; 10.9; Control box; 11. Detailed Implementation

[0102] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0103] This invention provides a traffic signal light for intelligent transportation, as shown in the figure, comprising a mounting frame 1, a cylindrical connecting beam 2, multiple signal light heads 3 fixed to the mounting frame 1, and multiple rotating units mounted to the connecting beam 2. Each rotating unit is equipped with a data acquisition mounting base 5 or a millimeter-wave radar 6.1. The data acquisition mounting base 5 is equipped with an image acquisition unit 5.1 and a laser ranging sensor 5.2. Each rotating unit includes two fixed parts and a rotating part located between the two fixed parts. The fixed parts include a fixing ring 4.1 fixed to the connecting beam 2, a fixing block 4.2 fixedly connected to the fixing ring 4.1, a first motor 4.3 mounted to the fixing block 4.2, and a drive gear 4.4 driven by the first motor 4.3. The rotating part includes a cylindrical rotating cylinder 4.5 through which the connecting beam 2 passes, and two gear rings 4.6 fixed to both ends of the rotating cylinder 4.5 and meshing with the drive gear 4.4. The rotating unit comprises three units: two first rotating units and one second rotating unit located between the two first rotating units. Two acquisition mounting bases 5 are installed at the rotating cylinder of each of the first rotating units, and a rotating base 6 is fixed at the rotating cylinder of each of the second rotating units. Two millimeter-wave radars 6.1 are mounted on the rotating base 6. The mounting frame 1 includes two side plates 1.1 and a connecting top plate 1.2 fixed between the two side plates 1.1. The traffic light also includes a cleaning unit, which includes a horizontal slide rail fixed to the connecting top plate 1.2, a second motor 7.1 mounted on one of the side plates 1.1, a bearing mounted on the other side plate 1.1, a lead screw 7.2 connecting the second motor 7.1 and the bearing, a slide block 7.3 mounted on the horizontal slide rail, and an airflow generating unit 7.4 mounted on the slide block 7.3. The slide block 7.3 has a threaded hole through which the lead screw 7.2 passes, and the airflow generating unit 7.4 is connected to a nozzle 7.5.

[0104] The traffic signal light also includes a positioning reinforcement unit, two lifting drive units, and two cleaning units. The positioning reinforcement unit includes a reinforcing beam 8.1 and two lifting seats 8.2 fixed to the reinforcing beam 8.1. The lifting drive unit includes a first fixed seat 9.1 fixed to the side plate 1.1, a vertical slide rail 9.2 fixed to the side plate 1.1, and an electric lifting rod 9.3 connecting the first fixed seat 9.1 and the reinforcing beam 8.1. The connecting beam 2 has a positioning blind hole 2.1, and the lifting seat 8.2 is fixed with a positioning support column 8.3 that can be inserted into the positioning blind hole 2.1. The cleaning unit includes a cleaning container 10.1 with an open top fixed to the reinforcing beam 8.1, an ultrasonic generating unit installed on the cleaning container 10.1, a liquid storage container 10.2 fixed to the side plate 1.1, a waste liquid container 10.3 fixed to the side plate 1.1, and a connection between the cleaning container 10.1 and the liquid storage container 10. The system includes an inlet pipe 10.4, a drain pipe 10.5 connecting the cleaning container 10.1 and the waste liquid container 10.3, an inlet valve 10.4.1 installed at the inlet pipe 10.4, a drain valve 10.5.1 installed at the drain pipe 10.5, an inlet pump 10.4.2 installed at the inlet pipe 10.4, and a drain pump 10.5.2 installed at the drain pipe 10.5; a rectangular frame-shaped protruding edge 5.3 fixed at the acquisition mounting base 5, which can abut and seal with the top of the cleaning container 10.1; a first liquid level sensor is installed inside the cleaning container 10.1, and a second liquid level sensor is installed inside the storage container 10.2; when the electric lifting rod 9.3 is at the first length, the positioning support column 8.3 is inserted into the positioning blind hole 2.1, and when the electric lifting rod 9.3 is at the second length, the positioning support column 8.3 is disengaged from the positioning blind hole 2.1; the first length is greater than the second length.

[0105] The cleaning unit further includes a second fixed seat 10.6 fixed to the reinforcing crossbeam 8.1, a first electric telescopic rod 10.7 installed on the second fixed seat 10.6, and an L-shaped cover 10.8 driven by the first electric telescopic rod 10.7, the cover 10.8 being able to close the top opening of the cleaning container 10.1. The mounting frame 1 also includes two strip baffles 1.3 fixedly connected to the connecting top plate 1.2 and the two side plates 1.1; two U-shaped frames 1.4 are fixed at the mounting frame 1; the lifting seat 8.2 has two limiting insertion holes 8.2.1; two second electric telescopic rods 1.5 are fixed at the U-shaped frames 1.4, the movable ends of the second electric telescopic rods 1.5 being able to be inserted into the limiting insertion holes 8.2.1. Fixed flanges 2.2 are fixed at both ends of the connecting crossbeam 2, the fixed flanges 2.2 being fixedly connected to the side plates 1.1; a control box 11 is installed at one of the side plates 1.1, the control box 11 containing a control unit and a wireless communication unit. The traffic lights are in a working state, in which each positioning support column 8.3 is inserted into the corresponding positioning blind hole 2.1, and the movable end of each second electric telescopic rod 1.5 is inserted into the corresponding limiting insertion hole 8.2.1. The electric lifting rod 9.3 is at the first length.

[0106] Working Principle: The traffic light of this application, by installing a first rotating unit and a second rotating unit at the connecting crossbeam, uses a first rotating unit with an image acquisition unit and a laser rangefinder sensor mounted on it, and a millimeter-wave radar mounted on it in the second rotating unit. This allows the millimeter-wave radar to determine if there are vehicles on the road near the mounting frame, and the laser rangefinder sensor to further determine the presence of vehicles, thus improving accuracy. Furthermore, in operation, the positioning support column is inserted into the positioning blind hole, and the movable end of the second electric telescopic rod is inserted into the limiting socket, thereby connecting the crossbeam, the connecting top plate, the reinforcing crossbeam, and the U-shaped frame into a single unit, resulting in greater overall strength and less susceptibility to deformation. Because the measurement angle of the laser rangefinder sensor is controlled by the first rotating cylinder, changes in the rotating cylinder angle significantly affect the position of the measurement point when detecting at longer distances, such as 20-30 meters. Therefore, the stability and resistance to deformation of the mounting frame and connecting crossbeam contribute to the normal operation of the laser rangefinder sensor at different angles.

[0107] This application also discloses a control method based on the above-mentioned traffic signal light, the control method including a signal duration adjustment operation, wherein the control unit controls the traffic signal light to perform the duration adjustment operation once every set interval (e.g., 2 seconds);

[0108] The signal duration adjustment operation includes the following steps:

[0109] 1) Is the traffic light green? If so, proceed to step 2).

[0110] 2) Within 30 meters of the mounting frame, does the millimeter-wave radar detect no vehicles? If so, proceed to step 3).

[0111] 3) Within 30 meters of the mounting frame, check if the laser rangefinder at each first rotating unit detects no vehicle. If so, proceed to step 4).

[0112] 4) Is the remaining green light time greater than or equal to 10 seconds? If so, proceed to step 5).

[0113] 5) This causes the green light to immediately enter a 3-second countdown.

[0114] Therefore, when there are no vehicles on the road and the streetlights still have a long time left, the remaining green light duration can be shortened in time, thus turning the light red and freeing up road resources for vehicles on the other side of the road.

[0115] The control method includes a cleaning step, a detection step, and a cleaning step. In the cleaning step, the electric lifting rod descends from a first length to a second length, and cleaning fluid is injected into the cleaning container (the inlet valve and inlet pump are opened, and the inlet valve and inlet pump are closed after the cleaning fluid is injected), so that one of the acquisition mounting seats of the first rotating unit faces the cleaning container. Then, the electric lifting rod extends to the first length, and each acquisition mounting seat is inserted into the corresponding cleaning container with its convex edge abutting and sealing against the top of the cleaning container. The ultrasonic generating unit is turned on. Thus, ultrasonic cleaning can be used to clean the lens of the image acquisition unit and the laser rangefinder sensor. After cleaning, the ultrasonic generating unit is turned off.

[0116] The control method also includes a detection step. Since the detection and cleaning operations are somewhat similar, to improve efficiency, a detection operation can be performed immediately after the cleaning operation (of course, the detection operation can also be performed separately). In this detection step, after the cleaning operation is completed, the inlet valve and inlet pump are opened (for example, the inlet valve and inlet pump are in the open state for 20 or 30 seconds). If the second liquid level sensor detects a continuous drop in the liquid level of the storage container, it is determined that a fault has occurred, thus prompting maintenance. Under normal circumstances, when the cap and the cleaning container are well sealed, even if the inlet pump continues to run, it cannot continue pumping cleaning fluid after the cleaning container is full (there may still be some air remaining inside). (The measurement value of the second liquid level sensor can determine whether the cleaning fluid is being continuously pumped). If the cleaning fluid can continue to be pumped, it indicates that the cleaning container and the raised edge are not well sealed, and the cleaning fluid is leaking from the gap. Because the top of the cleaning container is equipped with an elastic sealing gasket, under normal circumstances, a good seal can be achieved between the raised edge and the cleaning container. The inability to seal well between the cleaning container and the raised edge indicates that there may be some relative deformation between the reinforcing beam and the connecting beam. The deformation of the connecting beam may adversely affect the detection of the laser rangefinder, thus prompting timely maintenance.

[0117] The control method also includes a cleaning step. In this step, the electric lifting rod is at its second length, and the airflow from the nozzle cleans the image acquisition unit, laser rangefinder, and millimeter-wave radar. During this cleaning step, the line connecting the two acquisition mounting seats of the first rotating cylinder is horizontal; the line connecting the two millimeter-wave radars of the second rotating cylinder is also horizontal. Specifically, in the cleaning step, the airflow from the nozzle first cleans the acquisition mounting seats on one side of the first rotating cylinder and the millimeter-wave radars on the other side of the second rotating cylinder. Then, both the first and second rotating cylinders rotate 180 degrees, and the airflow from the nozzle cleans the acquisition mounting seats on the other side of the first rotating cylinder and the millimeter-wave radars on the other side of the second rotating cylinder. In actual operation, after each cleaning operation, a detection operation is immediately performed, and after the detection operation, the cleaning operation is immediately performed, thus achieving a timely drying effect. Of course, the cleaning operation can also be performed independently using airflow.

[0118] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.

Claims

1. A traffic signal light for intelligent transportation, characterized in that, The system includes a mounting frame, a cylindrical connecting beam, multiple signal light heads fixed to the mounting frame, and multiple rotating units mounted on the connecting beam. Each rotating unit is equipped with a data acquisition mounting base or millimeter-wave radar, and the data acquisition mounting base is equipped with an image acquisition unit and a laser ranging sensor. Each rotating unit includes two fixed parts and a rotating part. The fixed parts include a fixing ring fixed to the connecting beam, a fixing block fixedly connected to the fixing ring, a first motor mounted on the fixing block, and a drive gear driven by the first motor. The rotating part includes a cylindrical rotating cylinder through which the connecting beam passes, and two gear rings fixed to both ends of the rotating cylinder and meshing with the drive gear. The traffic signal light for intelligent transportation also includes a positioning reinforcement unit, two lifting drive units, and two cleaning units. The positioning reinforcement unit includes a reinforcing beam and two lifting seats fixed to the reinforcing beam. The lifting drive unit includes a first fixed seat fixed to a side plate, a vertical slide rail fixed to the side plate, and an electric lifting rod connecting the first fixed seat and the reinforcing beam. The connecting beam has a positioning blind hole, and the lifting seats are fixed with positioning support columns. The cleaning unit includes a cleaning container with an open top fixed to the reinforcing beam, an ultrasonic generating unit, a liquid storage container, a waste liquid container, and a connecting cleaning container. The device includes an inlet pipe for the cleaning container and the storage container, a drain pipe connecting the cleaning container and the waste liquid container, an inlet valve installed at the inlet pipe, a drain valve installed at the drain pipe, an inlet pump installed at the inlet pipe, and a drain pump installed at the drain pipe; a protruding edge is fixed at the acquisition mounting base; a first liquid level sensor is installed inside the cleaning container, and a second liquid level sensor is installed inside the storage container; when the electric lifting rod is at a first length, the positioning support column is inserted into the positioning blind hole, and when the electric lifting rod is at a second length, the positioning support column is disengaged from the positioning blind hole; the first length is greater than the second length; The mounting frame includes two side plates and a connecting top plate fixed between the two side plates; the traffic light also includes a cleaning unit, which includes a horizontal slide rail fixed to the connecting top plate, a second motor mounted on one of the side plates, a bearing mounted on the other side plate, a lead screw connecting the second motor and the bearing, a slide block mounted on the horizontal slide rail, and an airflow generating unit mounted on the slide block. The slide block has a threaded hole through which the lead screw passes, and the airflow generating unit is connected to a nozzle. The mounting frame also includes two strip baffles that are fixedly connected to the top plate and the two side plates; two U-shaped frames are fixed at the mounting frame; the lifting seat has two limiting holes; two second electric telescopic rods are fixed at the U-shaped frames, and the movable ends of the second electric telescopic rods can be inserted into the limiting holes.

2. The traffic signal light for intelligent transportation according to claim 1, characterized in that, The rotating unit consists of three units, including two first rotating units and one second rotating unit. Two acquisition mounting bases are installed at the rotating cylinder of the first rotating unit, and a rotating base is fixed at the rotating cylinder of the second rotating unit, with two millimeter-wave radars installed at the rotating base.

3. The traffic signal light for intelligent transportation according to claim 1, characterized in that, The cleaning unit also includes a second fixed base fixed to the reinforcing beam, a first electric telescopic rod installed on the second fixed base, and an L-shaped cover driven by the first electric telescopic rod, the cover being able to close the top opening of the cleaning container.

4. The traffic signal light for intelligent transportation according to claim 1, characterized in that, The two ends of the connecting beam are fixed with fixed flanges, which are fixedly connected to the side plates; a control box is installed on one of the side plates, and a control unit and a wireless communication unit are installed inside the control box.

5. A control method for traffic lights for intelligent transportation based on any one of claims 1-4, characterized in that, The control method includes a signal duration adjustment operation, which includes the following steps: 1) Is the traffic light green? If so, proceed to step 2). 2) Within the set distance from the mounting frame, does the millimeter-wave radar detect no vehicles? If so, proceed to step 3). 3) Within the set distance from the mounting frame, does the laser rangefinder detect no vehicle? If so, proceed to step 4). 4) Is the remaining green light duration greater than or equal to the set duration? If so, proceed to step 5). 5) This causes the green light to immediately enter a 3-second countdown.

6. The control method according to claim 5, characterized in that, The set distance is 30 meters; the set duration is 10 seconds; the control unit controls the traffic light to perform the duration adjustment operation once every set interval; the set interval is 2 seconds.

7. The control method according to claim 5, characterized in that, The control method includes a cleaning step, a detection step, and a cleaning step. In the cleaning step, the electric lifting rod descends from a first length to a second length, and cleaning fluid is injected into the cleaning container so that one of the acquisition mounting seats of the first rotating sleeve faces the cleaning container. The inlet pump and inlet valve are closed. Then, the electric lifting rod extends to the first length, and each acquisition mounting seat is inserted into the corresponding cleaning container with its protruding edge abutting and sealing against the top of the cleaning container. The ultrasonic generating unit is turned on. In the detection step, after the cleaning operation is completed, the inlet valve and inlet pump are opened. If the second liquid level sensor detects that the liquid level in the storage container continues to drop, it is determined that a fault has occurred. In the cleaning step, the electric lifting rod is at the second length, and the image acquisition unit, laser rangefinder sensor, and millimeter-wave radar are cleaned by the air outlet of the nozzle.

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