Pedestrian target driving system tensioning structure for autonomous vehicle

Abstract

The utility model discloses a pedestrian target driving system tensioning structure for a preventive safety function test of an automatic driving vehicle, which comprises a counterweight bottom plate, a first belt walking mechanism and a second belt walking mechanism are fixed on the counterweight bottom plate, a third belt walking mechanism is mounted at a position perpendicular to a connecting line of the first belt walking mechanism and the second belt walking mechanism through a rail, and the three belt walking mechanisms are arranged in a triangular shape. A ratchet wheel and pawl assembly is further installed on the balance weight bottom plate, a ratchet wheel is connected with the third belt conveying mechanism through a pull rope, and when the ratchet wheel rotates, the pull rope rotates so as to pull the third belt conveying mechanism to move towards the far end along the track. The tensioning device is used for tensioning the toothed belt of the pedestrian target driving system, so that the manpower consumption can be well reduced, the burden of an engineer for arranging a scene is relieved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic driving function testing of intelligent network-connected vehicles, and in particular to a pedestrian target drive system tensioning structure for testing the preventive safety function of automatic driving vehicles. The system drive model includes static pedestrian targets, dynamic pedestrian targets, two-wheeled bicycles and battery vehicle targets. Background Art

[0002] According to GB / T 41798-2022, during the field test of the automatic driving function of intelligent connected vehicles, such as pedestrian and non-motor vehicle identification response and automatic emergency avoidance, including basic functional tests such as pedestrians crossing crosswalks, pedestrians walking along the road, bicycles riding in the same lane, pedestrians crossing the road, and bicycles crossing the road, the test method requires pedestrians or bicycles to walk or drive at a certain speed, and even has requirements for the pre-collision time between the test vehicle and the pedestrian or bicycle. For example, in the test of pedestrians crossing the road, it is required that when the pre-collision time reaches the time interval of 3.5s to 4.5s for the first time, the pedestrian crosses the road at a speed of 5km / h to 6.5km / h on the left side of the test vehicle.

[0003] In order to achieve precise control of the pre-collision time between the test vehicle and pedestrians or bicycles and the walking or driving speed of pedestrians or bicycles, the test process introduced a pedestrian target drive system (cylinder version). The pedestrian target drive system mainly consists of an active drive module, a pedestrian skateboard, a toothed belt, a right-angle turning wheel set, a double-belt turning module, and a counterweight, such as Figure 1 As shown in the figure, since the test site is not fixed, it is often necessary to temporarily arrange it according to the test scenario. The above-mentioned counterweight is mainly used to assist the positioning of the system.

[0004] The active drive module of the system is driven by a pneumatic device. During use, the belt tension needs to be ensured. Usually, the magnetic scale stroke needs to be between 40mm and 50mm, otherwise the equipment will enter an emergency stop state. When using the pedestrian target drive system (cylinder version) to arrange the test scene, it is usually necessary to pull the active drive module manually to tighten the toothed belt and keep the magnetic scale stroke between 45mm and 50mm. In order to stabilize the magnetic scale stroke, it is also necessary to press the counterweight while pulling the active drive module to tighten the toothed belt. The whole process is extremely labor-intensive and seriously affects the efficiency of the test. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a tensioning structure of a pedestrian target drive system for preventive safety function testing of autonomous driving vehicles. The tensioning structure can conveniently adjust the tension of the toothed belt so that the stroke of the magnetic scale can be stably maintained within the working range, thereby avoiding unnecessary manpower consumption, reducing the burden on engineers to arrange scenes, and improving work efficiency.

[0006] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0007] A tensioning structure of a pedestrian target drive system for testing preventive safety functions of an autonomous driving vehicle comprises a counterweight base plate, on which a first and a second tape transport mechanism are fixed, and a third tape transport mechanism is installed through a track perpendicular to the line connecting them, and the three tape transport mechanisms are arranged in a triangle. A ratchet and pawl assembly is also installed on the counterweight base plate, wherein the ratchet is connected to the third tape transport mechanism by a pull rope, and when the ratchet rotates, the pull rope is rotated to pull the third tape transport mechanism to move toward the far end along the track.

[0008] After the pedestrian target drive system is set up, the toothed belt is operated to pass through the first, second and third belt conveyors of the tensioning structure of the utility model, and the ratchet is rotated, so that the belt conveyor third can be pulled along the track to the far end by the pull rope to tighten the toothed belt and keep the travel of the magnetic scale within the working range. It can be seen that the use of the utility model can greatly reduce manpower consumption, reduce the burden of engineers in arranging scenes, and improve work efficiency.

[0009] Preferably, the ratchet has a cylindrical protrusion on the top, the cylindrical protrusion has a hole that runs through the cylinder transversely, and the radius of the top of the cylindrical protrusion is slightly larger.

[0010] The hole facilitates the fixing of the draw cord, and the slightly larger design at the top allows the draw cord to be easily wrapped around it without slipping off.

[0011] Preferably, a hexagon socket screw hole is provided at the top center of the cylindrical protrusion, so that engineers can easily use a hexagon socket screw wrench to turn the ratchet.

[0012] As a preferred embodiment of the utility model: two groove channels are parallelly arranged on the counterweight bottom plate, and a pair of fixed pulleys passing through the middle belt are vertically arranged at both ends of each groove channel, wherein the fixed pulley pair at one end of one groove channel constitutes belt walking mechanism 1, and the fixed pulley pair at the other end constitutes belt walking mechanism 2, and belt walking mechanism 3 and ratchet pawl assembly are arranged in the groove between the two groove channels, and the groove is connected with the groove channels where belt walking mechanisms 1 and 2 are located, so that they are arranged on the same low plane;

[0013] The belt transport mechanism 3 is a movable pulley with teeth;

[0014] A cover plate is also fixed on the counterweight bottom plate, the top of the cylindrical protrusion is exposed through a circular hole on the cover plate, and the upper end of the movable pulley is slidably installed in a limiting track on the cover plate.

[0015] The counterweight bottom plate is provided with four square grooves, each of which is provided with a pull ring which can be received in the square groove.

[0016] The pull ring provides engineers with leverage points to facilitate the movement of the entire structure.

[0017] Compared with the prior art, the utility model mainly has the following advantages:

[0018] By using the utility model to tension the toothed belt of the pedestrian target drive system, compared with the traditional method of pulling the active drive module of the pedestrian target drive system to tighten the toothed belt to a suitable degree while pressing the counterweight to maintain the tension of the toothed belt, the labor consumption can be greatly reduced, the burden on engineers to arrange the scene can be alleviated, and work efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a pedestrian target drive system for testing preventive safety functions of an autonomous driving vehicle in the prior art;

[0020] Figure 2 A schematic diagram of a tensioning structure of a pedestrian target drive system for preventive safety function testing of an autonomous driving vehicle according to a preferred embodiment of the utility model;

[0021] Figure 3 for Figure 2 Schematic diagram of the principle of tensioning the toothed belt in the middle tensioning structure;

[0022] Figure 4 for Figure 2 Reference diagram of the usage status of the tensioning structure. DETAILED DESCRIPTION

[0023] In order to reduce manpower consumption, relieve the burden of engineers in arranging scenes, and improve work efficiency, the utility model designs a tensioning structure of a pedestrian target drive system for preventive safety function testing of autonomous driving vehicles. The main scheme is: fix the belt transport mechanism 1 and the belt transport mechanism 2 on the counterweight base plate, and install the belt transport mechanism 3 through the track at a position perpendicular to their connection, so that the three belt transport mechanisms are arranged in a triangle, and then connect the ratchet in the ratchet pawl assembly with the belt transport mechanism 3 through a pull rope. When in use, first place the pedestrian target drive system, let its toothed belt pass around the belt transport mechanisms 1, 2, and 3 of the tension structure of the utility model, and then rotate the ratchet to make the pull rope turn around to pull the belt transport mechanism 3 along the track to the far end, thereby tensioning the toothed belt and keeping the travel of the magnetic scale stable within the working range. The utility model can well reduce manpower consumption, relieve the burden of engineers in arranging scenes, and improve work efficiency.

[0024] As a preferred embodiment of the present utility model, Figure 2 As shown, the tension structure of this embodiment includes a square counterweight base plate 1. The main material of the counterweight base plate 1 is steel, which plays the role of a counterweight to prevent the wheel group from moving in the process of driving the pedestrian target to move. A groove channel is provided on the upper and lower sides of the counterweight base plate 1. A pair of fixed pulleys 2 passing through the middle belt are vertically provided at both ends of each groove channel. The two groove channels are used for the belt running of the rotating toothed belts in different directions. The width of the groove channel is slightly larger than the width of the toothed belt, and the spacing between each pair of fixed pulleys 2 just matches the thickness of the toothed belt. While limiting and protecting the toothed belt, it ensures that the toothed belt passes smoothly in the groove channel. The right side of the counterweight base plate 1 is provided with a combination hole 3, so that it can be combined with a right-angle turning wheel group, such as Figure 4 As shown, Figure 4 The a in the figure is the tensioning structure in this embodiment. The four corners of the counterweight base plate 1 between the two groove channels each have a square groove 8, and a pull ring (not shown) is installed in each square groove 8, which can be received in the square groove 8. The pull ring provides a leverage point for engineers to facilitate the movement of the entire structure.

[0025] There is a U-shaped groove in the middle of the counterweight base plate 1, and the U-shaped mouth of the U-shaped groove is connected to a groove channel, so that they are located on the same low-level plane. A bearing is fixedly installed at the center of the U-shaped bottom circle of the U-shaped groove, that is, the center position of the counterweight base plate 1. On the bearing, a ratchet 4 is installed, and the ratchet 4 can rotate freely on the bearing. A matching pawl 5 is installed on one side of the ratchet 4, and the combination of the ratchet 4 and the pawl 5 ensures that the ratchet 4 can only rotate in one direction under normal working conditions. There is a cylindrical protrusion on the top of the ratchet 4, and the cylindrical protrusion has a hole that passes through the cylinder horizontally, and the radius of the top of the cylinder is slightly larger. The design of the cylindrical protrusion through the hole and the slightly larger top makes it easy to fix and wind the pull rope on the cylindrical protrusion. In this embodiment, the pull rope is specifically made of silk thread. A hexagonal screw hole is provided in the top center of the cylindrical protrusion, so that engineers can easily use a hexagonal screw wrench to turn the ratchet 4. At the center of the U-shaped opening of the U-shaped groove, perpendicular to the groove channel, there is a limit groove track, in which a movable pulley 6 is installed. The movable pulley 6 can only move and rotate in the limit groove track. The movable pulley 6 is a gear that can mesh with the toothed belt. The other end of the silk thread is tied to the movable pulley 6.

[0026] When the engineer turns the ratchet 4, the thread is spun around, dragging the movable pulley 6 toward the ratchet 4. Figure 3 As shown in the figure (F represents the traction force on the movable pulley 6, 2l represents the length of the toothed belt opposite to the U-shaped groove when the toothed belt is not pulled, and 2l' represents the length of the toothed belt in the U-shaped groove section after being pulled by the movable pulley 6), the toothed belt is tightened, the stroke of the magnetic scale is shortened, and it is stabilized within the working range.

[0027] A cross cover plate 7 is fixed above the U-shaped groove on the counterweight base plate 1 of the above embodiment, which is used to prevent the ratchet 4, the pawl 5 and the movable pulley 6 from loosening during normal operation. There are circular holes and limit tracks on the cross cover plate 7. The circular holes are used to leave space for engineers to use a wrench to twist the ratchet 4, and the limit tracks are used to limit the movement range of the movable pulley 6.

[0028] This embodiment uses a combination of a ratchet, a pawl, a movable pulley and a wire. The ratchet and pawl structure realizes the unidirectional rotation of the ratchet. The movable pulley is connected by a wire, and the rotation of the ratchet can be converted into the movement of the movable pulley. The toothed belt is then tensioned by the movement of the movable pulley, thereby shortening the travel of the magnetic scale. The embodiment of the utility model can stabilize the tension of the toothed belt within the working range, allowing engineers to easily realize the layout of the pedestrian drive system by rotating the ratchet.

[0029] The tensioning structure in this embodiment can dynamically adjust the tension of the toothed belt according to the actual working environment, and can also achieve a wider range of adjustment through combination to adapt to different testing requirements.

[0030] The above-mentioned embodiments of the utility model are not intended to limit the protection scope of the utility model, and the implementation methods of the utility model are not limited to these. All other various forms of modifications, replacements or changes made to the above-mentioned structure of the utility model based on the above-mentioned contents of the utility model, in accordance with the common technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the utility model, should fall within the protection scope of the utility model.

Claims

1. A pedestrian target drive system tensioning structure for preventive safety function testing of an autonomous driving vehicle, characterized in that: It includes a counterweight base plate, on which a tape transport mechanism 1 and a tape transport mechanism 2 are fixed, and a tape transport mechanism 3 is installed through a track perpendicular to the connection position between them, and the three tape transport mechanisms are arranged in a triangle. A ratchet and pawl assembly is also installed on the counterweight base plate, wherein the ratchet is connected to the tape transport mechanism 3 by a pull rope, and when the ratchet rotates, the pull rope rotates to pull the tape transport mechanism 3 to move toward the far end along the track.

2. The tensioning structure according to claim 1, characterized in that: The ratchet wheel has a cylindrical protrusion on the top, and the cylindrical protrusion has a hole that runs through the cylinder transversely, and the radius of the top of the cylindrical protrusion is slightly larger.

3. The tensioning structure according to claim 2, characterized in that: A hexagon socket screw hole is provided at the top center of the cylindrical protrusion, so that an engineer can easily use a hexagon socket screw wrench to turn the ratchet.

4. The tensioning structure according to claim 3, characterized in that: Two groove channels are parallelly arranged on the counterweight bottom plate, and a pair of fixed pulleys passing through the middle belt are vertically arranged at both ends of each groove channel, wherein the fixed pulley pair at one end of one groove channel constitutes belt transport mechanism 1, and the fixed pulley pair at the other end constitutes belt transport mechanism 2, and belt transport mechanism 3 and ratchet pawl assembly are arranged in the groove between the two groove channels, and the groove is connected with the groove channels where belt transport mechanisms 1 and 2 are located, so that they are arranged on the same low-level plane; The belt transport mechanism 3 is a movable pulley with teeth; A cover plate is also fixed on the counterweight bottom plate, the top of the cylindrical protrusion is exposed through a circular hole on the cover plate, and the upper end of the movable pulley is slidably installed in a limiting track on the cover plate.

5. The tensioning structure according to claim 1, characterized in that: The counterweight bottom plate is provided with four square grooves, each of which is provided with a pull ring which can be received in the square groove.

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