Moving target object traction device for intelligent safe driving test

Abstract

The utility model provides a moving target object traction device for an intelligent safe driving test. The moving target object traction device comprises a driving frame, a transmission assembly, an end frame, a moving rack and a stopwatch, the bottom of the driving frame is rotationally connected with a first belt wheel, and the top is rotationally connected with a driving hand wheel; the transmission assembly is connected with the first belt wheel and the driving hand wheel. The end frame and the driving frame are spaced, the bottom of the end frame is rotationally connected with a second belt wheel, and the second belt wheel and the first belt wheel are sleeved with a traction belt together; the movable rack is driven by the traction belt to move between the driving frame and the end frame; the stopwatch is used for detecting the rim linear speed of the first belt wheel. The moving target object traction device for the intelligent safe driving test provided by the utility model is simple in structure, convenient to operate flexibly, and capable of simulating diversified road crossing situations of pedestrians, thereby improving the safety test effect, and facilitating the promotion and improvement of the intelligent safe driving technology of vehicles.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle safety testing, and in particular relates to a mobile target object traction device for intelligent safety driving testing. Background Art

[0002] With the rapid development of intelligent driving technology, active safety, passive safety, pedestrian protection, etc. during vehicle driving must be fully considered; among them, the performance of reliable detection of pedestrians crossing the road to avoid collision during vehicle driving is a very important safety indicator.

[0003] At present, there are two types of dummy moving devices used in collision safety tests for pedestrians crossing the road. One is to use a motor-driven traction mechanism to drive a moving cart to move back and forth on the ground. The other is to place a dummy directly on a self-propelled cart. Both methods are limited by the constraints of the electronic control program and cannot arbitrarily change the dummy's moving speed to simulate emergencies. Moreover, both devices have high costs, especially the latter. Since collisions often occur during the test, it is very easy for the electric drive and electronic control components to be damaged together with the dummy by collision, resulting in high testing costs. Utility Model Content

[0004] The embodiment of the utility model provides a moving target object traction device for intelligent safe driving test, which aims to solve the problem that the moving speed of the target object cannot be changed arbitrarily during the test process and reduce the cost.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: to provide a mobile target traction device for intelligent safe driving test, comprising:

[0006] A driving frame is used to be fixed on the ground, the bottom of the driving frame is rotatably connected to a first pulley, and the top of the driving frame is rotatably connected to a driving hand wheel;

[0007] A transmission assembly, connected to the first pulley and the driving handwheel respectively, and used to enable the driving handwheel to drive the first pulley to rotate at a speed higher than that of the driving handwheel;

[0008] The end frame is used to be fixed on the ground and spaced apart from the driving frame. The bottom of the end frame is rotatably connected to a second pulley, and a traction belt is sleeved on the second pulley and the first pulley;

[0009] The mobile platform is connected to the traction belt and is used to move between the driving frame and the end frame under the drive of the traction belt. The mobile platform is used to place the moving target object;

[0010] The code meter is arranged on the top of the driving frame, and the detection end of the code meter is aligned with the rim of the first pulley, so as to detect the linear speed of the rim of the first pulley.

[0011] In a possible implementation, the transmission assembly includes:

[0012] A driving pulley, sleeved on the axle of the first pulley and located below the first pulley;

[0013] The driven pulley is sleeved on the axle of the second pulley and is flush with the driving pulley in height. The diameter of the driven pulley is smaller than that of the driving pulley.

[0014] The synchronous belt is mounted on the driving pulley and the driven pulley together, and is used to transmit the torque of the driving pulley to the driven pulley in the same direction.

[0015] In some embodiments, a first tensioning wheel and a second tensioning wheel are respectively provided on both sides of the synchronous belt on the driving frame, and both the first tensioning wheel and the second tensioning wheel have a tensioned state in which they are pressed and contacted with the synchronous belt, and a relaxed state in which they are separated from the synchronous belt; wherein, when the driving pulley drives the driven pulley to rotate forward or reverse, one of the first tensioning wheel and the second tensioning wheel is in a tensioned state, and the other is in a relaxed state.

[0016] Exemplarily, the first tensioner and the second tensioner both include:

[0017] The push assembly is fixedly connected to the driving frame and is located outside the synchronous belt;

[0018] The tensioner body is rotatably connected to the output end of the push assembly;

[0019] Wherein, in the tensioned state, the tensioner body is pressed against the outer belt surface of the synchronous belt under the pushing action of the pushing assembly, and in the relaxed state, the tensioner body is away from the synchronous belt under the pulling action of the pushing assembly.

[0020] For example, the push assembly includes:

[0021] A fixed seat, fixedly connected to the driving frame;

[0022] A push rod is horizontally passed through the fixing seat and slidably cooperates with the fixing seat;

[0023] The wheel seat is fixedly connected to one end of the push rod facing the synchronous belt, and the wheel seat is used for rotationally connecting the tensioner body;

[0024] An operating rod is rotatably connected to a fixed seat, a connecting rod is hingedly connected to a portion of the operating rod close to its rotating shaft, and the connecting rod is hingedly connected to an end of the top rod away from the synchronous belt;

[0025] When the operating rod swings, the connecting rod forms a pushing force or a pulling force on the push rod.

[0026] Exemplarily, the operating rod is aligned with the push rod along the axial direction of the push rod, and the connecting rod is an L-shaped bent rod.

[0027] For example, a sliding sleeve is provided on the fixing seat, and the push rod passes through the sliding sleeve and is slidably matched with the sliding sleeve.

[0028] In a possible implementation, the bottom of the driving frame is rotatably connected to a guide wheel on both sides of the traction belt, and the two guide wheels roll and contact the outer belt surfaces on both sides of the traction belt respectively; the diameter of the first pulley is greater than the diameter of the second pulley, and the spacing formed between the two guide wheels is equal to the diameter of the second pulley.

[0029] In some embodiments, the bottom of the mobile platform is rotatably connected to two rows of rollers, each of which is in the shape of an elongated cylinder, and there is a space between the two rows of rollers suitable for connecting to and passing through the traction belt.

[0030] In some embodiments, the code computer includes a digital display head, a sensor connected to the digital display head through a signal line, and an induction magnet; wherein the digital display head is arranged on the top of the driving frame, the induction magnet is arranged on the rim of the first pulley, and the sensor is arranged on the bottom wall of the driving frame and corresponds to the position of the induction magnet.

[0031] The beneficial effect of the mobile target traction device for intelligent safe driving test provided by the utility model is that compared with the prior art, in the mobile target traction device for intelligent safe driving test of the utility model, an operator can stand on the side of the driving frame and rotate the driving hand wheel, and use the transmission component to make the driving hand wheel drive the first pulley to rotate, so that the traction belt moves around the second pulley to pull the mobile platform to move between the driving frame and the end frame. Since the moving speed of the mobile platform is equal to the speed of the traction belt moving around the first pulley, the moving speed is equal to the rim linear speed of the first pulley. Here, the real-time detection of the rim linear speed of the first pulley by the code meter can facilitate the operator to control the speed of the rotating driving hand wheel at any time. The overall structure is simple and easy to operate, and there is no need to set up electric drive and electronic control components, which can reduce the manufacturing and maintenance costs; on this basis, the operator can arbitrarily control the speed of the mobile platform based on the driving hand wheel and the code meter, thereby simulating a variety of pedestrian crossing situations, thereby improving the safety test effect, and is conducive to the improvement and improvement of the intelligent and safe driving technology of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the three-dimensional structure of a mobile target traction device for intelligent safe driving testing provided by an embodiment of the utility model;

[0033] Figure 2 A schematic diagram of the top view of the driving frame used in the embodiment of the utility model;

[0034] Figure 3 for Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0035] Figure 4 for Figure 1 A schematic diagram of the local enlarged structure at B in the middle;

[0036] Figure 5 A schematic diagram of the three-dimensional structure of the push assembly (including the tensioner body) used in the embodiment of the utility model;

[0037] Figure 6 This is a schematic diagram of the three-dimensional structure of the mobile stand used in the embodiment of the utility model.

[0038] In the figure: 10, driving frame; 11, first pulley; 12, driving hand wheel; 13, first tensioner; 131, pushing assembly; 1311, fixed seat; 1312, push rod; 1313, wheel seat; 1314, operating rod; 1315, connecting rod; 1316, sliding sleeve; 132, tensioner body; 14, second tensioner; 15, guide wheel; 20, transmission assembly; 21, driving pulley; 22, driven pulley; 23, synchronous belt; 30, end frame; 31, second pulley; 40, moving stand; 41, roller; 50, traction belt; 60, code meter; 61, digital display head; 62, signal line; 63, sensor; 64, induction magnet; 70, moving target. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on another element or indirectly on another element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0041] Please also read Figures 1 to 6, the mobile target object traction device for intelligent safe driving test provided by the utility model is now described. The mobile target object traction device for intelligent safe driving test includes a drive frame 10, a transmission assembly 20, an end frame 30, a mobile stand 40, and a stopwatch 60; wherein the drive frame 10 is used to be fixed on the ground, the bottom of the drive frame 10 is rotatably connected to a first pulley 11, and the top is rotatably connected to a driving handwheel 12; the transmission assembly 20 is respectively connected to the first pulley 11 and the driving handwheel 12, and is used to make the driving handwheel 12 drive the first pulley 11 to rotate at a speed higher than the driving handwheel 12; the end frame 30 is used to be fixed on the ground The end frame 30 is rotatably connected to the ground and separated from the driving frame 10. The bottom of the end frame 30 is rotatably connected to the second pulley 31, and the second pulley 31 and the first pulley 11 are provided with a traction belt 50; the mobile platform 40 is connected to the traction belt 50, and is used to move between the driving frame 10 and the end frame 30 driven by the traction belt 50, and the mobile platform 40 is used to place a moving target object 70; the stopwatch 60 is arranged on the top of the driving frame 10, and the detection end of the stopwatch 60 is aligned with the rim of the first pulley 11, and is used to detect the rim linear speed of the first pulley 11.

[0042] The mobile target traction device for intelligent safe driving test provided in the present embodiment is compared with the prior art. The operator can stand on the side of the driving frame 10 to rotate the driving hand wheel 12, and use the transmission assembly 20 to make the driving hand wheel 12 drive the first pulley 11 to rotate, so that the traction belt 50 moves around the second pulley 31 and pulls the mobile platform 40 to move between the driving frame 10 and the end frame 30. Since the moving speed of the mobile platform 40 is equal to the speed of the traction belt 50 moving around the first pulley 11, the moving speed is equal to the rim linear speed of the first pulley 11. Here, the real-time detection of the rim linear speed of the first pulley 11 by the code meter 60 can facilitate the operator to control the speed of the rotating driving hand wheel 12 at any time. The overall structure is simple and easy to operate, and there is no need to set up electric drive and electric control components, which can reduce the manufacturing and maintenance costs. On this basis, the operator can arbitrarily control the speed of the mobile platform 40 based on the driving hand wheel 12 and the code meter 60, thereby simulating a variety of pedestrian crossing situations, thereby improving the safety test effect, which is conducive to the improvement and improvement of the intelligent and safe driving technology of the vehicle.

[0043] In some embodiments, see Figure 1 and Figure 3 The transmission assembly 20 includes a driving pulley 21, a driven pulley 22, and a synchronous belt 23; wherein the driving pulley 21 is sleeved on the axle of the first pulley 11 and is located below the first pulley 11; the driven pulley 22 is sleeved on the axle of the second pulley 31 and is flush with the driving pulley 21, and the diameter of the driven pulley 22 is smaller than the diameter of the driving pulley 21; the synchronous belt 23 is sleeved on the driving pulley 21 and the driven pulley 22 together, and is used to transmit the torque of the driving pulley 21 to the driven pulley 22 in the same direction.

[0044] The use of a synchronous belt 23 for transmission can improve the stability of power transmission. Considering the speed restriction of the human-powered rotating operating handwheel, the driving pulley 21 is set to be larger than the diameter of the driven pulley 22. It is preferred to form a two-to-one, three-to-one or even higher speed ratio between the driven pulley 22 and the driving pulley 21 (similar to the speed increase transmission of a bicycle), thereby ensuring that the mobile platform 40 can not only obtain a moving speed close to the walking speed, but also a moving speed close to the riding speed. Referring to the stopwatch 60, the moving speed of the target object can be arbitrarily controlled, thereby improving the test flexibility.

[0045] Please note that Figure 2 and Figure 3 A first tensioning wheel 13 and a second tensioning wheel 14 are respectively provided on the driving frame 10 on both sides of the synchronous belt 23. The first tensioning wheel 13 and the second tensioning wheel 14 both have a tensioned state in which they are pressed and contacted with the synchronous belt 23, and a relaxed state in which they are separated from the synchronous belt 23. When the driving pulley 21 drives the driven pulley 22 to rotate forward or reverse, one of the first tensioning wheel 13 and the second tensioning wheel 14 is in a tensioned state, and the other is in a relaxed state.

[0046] When both sides of the synchronous belt 23 are tightened simultaneously, the transmission resistance will increase, making it more difficult to rotate the driving handwheel 12. However, if the synchronous belt 23 is not tightened, it is likely to slip and affect the transmission efficiency. Therefore, a tensioning method in which the first tensioner 13 and the second tensioner 14 are selected to work is adopted here. According to the different rotation directions of the driving pulley 21, the traction side of the synchronous belt 23 on the driven pulley 22 is in a tightened state and the other side is in a relaxed state. This can ensure the wrap angle of the driving pulley 21 and the driven pulley 22 and improve the transmission stability, and can also reduce the transmission resistance caused by the excessive tension of the synchronous belt 23, thereby improving the labor-saving and smooth transmission.

[0047] See also Figure 2 and Figure 5 The first tensioner 13 and the second tensioner 14 both include a pushing assembly 131 and a tensioner body 132; the pushing assembly 131 is fixedly connected to the driving frame 10 and is located on the outside of the synchronous belt 23; the tensioner body 132 is rotatably connected to the output end of the pushing assembly 131; wherein, in the tensioned state, the tensioner body 132 is pressed against the outer belt surface of the synchronous belt 23 under the pushing action of the pushing assembly 131, and in the relaxed state, the tensioner body 132 is away from the synchronous belt 23 under the pulling action of the pushing assembly 131.

[0048] The pushing assembly 131 pushes the tensioner wheel body 132 to press against the outer belt surface of the synchronous belt 23, so that the traction side of the synchronous belt 23 is tightened, ensuring the wrap angle between the synchronous belt 23 and the driven wheel, and improving the transmission stability. At the same time, the pushing assembly 131 on the other side pulls back the tensioner wheel body 132 to allow the passive side of the synchronous belt 23 (the side opposite to the traction side) to have a certain degree of slack, thereby avoiding excessive tension of the synchronous belt 23 and causing excessive transmission resistance; when the moving platform 40 needs to move in the opposite direction, the driving pulley 21 needs to rotate in the opposite direction, and the passive side of the synchronous belt 23 is switched to the traction side. Therefore, it is only necessary to switch the tensioning state and the relaxation state of the first tensioner wheel 13 and the second tensioner wheel 14. The operation is simple and convenient, and can ensure that the moving platform 40 can maintain high stability during the two-way movement.

[0049] As a specific implementation of the above-mentioned push assembly 131, please refer to Figure 5 The pushing assembly 131 includes a fixed seat 1311, a push rod 1312, a wheel seat 1313, and an operating rod 1314; the fixed seat 1311 is fixedly connected to the driving frame 10; the push rod 1312 is horizontally penetrated on the fixed seat 1311 and slidably cooperates with the fixed seat 1311; the wheel seat 1313 is fixedly connected to the end of the push rod 1312 facing the synchronous belt 23, and the wheel seat 1313 is used to rotatably connect the tensioning wheel body 132; the operating rod 1314 is rotatably connected to the fixed seat 1311, and a connecting rod 1315 is hinged on the part of the operating rod 1314 close to its rotating shaft, and the connecting rod 1315 is hinged to the end of the push rod 1312 away from the synchronous belt 23; wherein, when the operating rod 1314 swings, the connecting rod 1315 forms a pushing force or a pulling force on the push rod 1312.

[0050] By swinging the operating rod 1314, the push-pull drive of the top rod 1312 can be achieved through the force transmission of the connecting rod 1315, thereby driving the tensioning wheel body 132 connected to the wheel seat 1313 to switch positions, thereby realizing the transition between the tensioned state and the relaxed state. The structure is simple and reliable, and the operation is convenient and labor-saving.

[0051] Optionally, in this embodiment, the operating rod 1314 and the top rod 1312 are aligned along the axial direction of the top rod 1312, and the connecting rod 1315 is an L-shaped curved rod. The L-shaped connecting rod 1315 can convert the rotational motion of the operating rod 1314 into the linear sliding motion of the top rod 1312 when the operating rod 1314 is swung, thereby realizing the push-pull drive of the tensioner body 132, which has a simple structure and saves labor.

[0052] In order to ensure the smoothness and stability of the sliding between the top rod 1312 and the fixing seat 1311, as shown in FIG. Figure 5 As shown, a sliding sleeve 1316 is provided on the fixing seat 1311 , and the push rod 1312 passes through the sliding sleeve 1316 and is slidably matched with the sliding sleeve 1316 .

[0053] For some possible implementations, see Figure 1 and Figure 2 The bottom of the driving frame 10 is rotatably connected to a guide wheel 15 on both sides of the traction belt 50, and the two guide wheels 15 roll and contact the outer belt surfaces on both sides of the traction belt 50; the diameter of the first pulley 11 is larger than the diameter of the second pulley 31, and the spacing formed between the two guide wheels 15 is equal to the diameter of the second pulley 31. By providing two guide wheels 15, the traction side and the passive side of the traction belt 50 can be parallel to each other, thereby improving the traction stability of the traction belt 50 on the moving platform 40, and at the same time, it can also reduce the space occupied by the traction belt 50, avoiding interference between the moving platform 40 and the traction belt 50 during movement.

[0054] Optionally, the structure of the mobile stand 40 in this embodiment is as follows: Figure 6 As shown, two rows of rollers 41 are rotatably connected to the bottom of the mobile platform 40, each roller 41 is in the shape of an elongated cylinder, and there is a space between the two rows of rollers 41 suitable for connecting and passing the traction belt 50. The two rows of elongated rollers 41 can ensure the movement stability of the mobile platform 40 on the ground, and at the same time, the space between the two rows of rollers 41 can accommodate the passage of the traction belt 50, ensuring that the traction belt 50 can be connected to the middle position of the mobile platform 40, thereby improving the traction stability of the traction belt 50 on the mobile platform 40.

[0055] It should be noted that see Figure 3 and Figure 4 In this embodiment, the code meter 60 includes a digital display head 61, a sensor 63 connected to the digital display head 61 through a signal line 62, and an induction magnet 64; wherein the digital display head 61 is arranged on the top of the driving frame 10, the induction magnet 64 is arranged on the rim of the first pulley 11, and the sensor 63 is arranged on the bottom wall of the driving frame 10 and corresponds to the position of the induction magnet 64. The sensor 63 and the induction magnet 64 detect the linear velocity of the rim relatively, and transmit the detection signal to the digital display head 61. The operator can directly obtain the movement speed of the moving platform 40 based on the value on the digital display head 61, which is very convenient.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mobile target traction device for intelligent safety driving test, characterized in that: include: A driving frame, used to be fixed on the ground, wherein the bottom of the driving frame is rotatably connected to a first pulley, and the top of the driving frame is rotatably connected to a driving hand wheel; A transmission assembly, connected to the first pulley and the driving handwheel respectively, and used to enable the driving handwheel to drive the first pulley to rotate at a speed higher than that of the driving handwheel; An end frame is used to be fixed on the ground and spaced apart from the driving frame, the bottom of the end frame is rotatably connected to a second pulley, and a traction belt is sleeved on the second pulley and the first pulley; A mobile platform connected to the traction belt, used to move between the driving frame and the end frame under the drive of the traction belt, and the mobile platform is used to place a moving target object; A code meter is arranged on the top of the driving frame, and a detection end of the code meter is aligned with the rim of the first pulley, so as to detect the linear velocity of the rim of the first pulley.

2. The mobile target traction device for intelligent safe driving test according to claim 1, characterized in that: The transmission assembly comprises: A driving pulley, sleeved on the axle of the first pulley and located below the first pulley; A driven pulley is sleeved on the axle of the second pulley and is flush with the driving pulley in height, and the diameter of the driven pulley is smaller than the diameter of the driving pulley; A synchronous belt is sleeved on the driving pulley and the driven pulley together, and is used to transmit the torque of the driving pulley to the driven pulley in the same direction.

3. The mobile target traction device for intelligent safe driving test according to claim 2, characterized in that: The driving frame is provided with a first tensioner and a second tensioner on both sides of the synchronous belt, respectively. The first tensioner and the second tensioner both have a tensioned state in which they are pressed and contacted with the synchronous belt, and a relaxed state in which they are separated from the synchronous belt; wherein, when the driving pulley drives the driven pulley to rotate forward or reverse, one of the first tensioner and the second tensioner is in the tensioned state, and the other is in the relaxed state.

4. The mobile target traction device for intelligent safe driving test according to claim 3, characterized in that: The first tensioner wheel and the second tensioner wheel both include: A push assembly, fixedly connected to the driving frame and located outside the synchronous belt; The tensioner body is rotatably connected to the output end of the push assembly; Wherein, in the tensioned state, the tension wheel body is pressed against the outer belt surface of the synchronous belt under the pushing action of the pushing assembly, and in the relaxed state, the tension wheel body is moved away from the synchronous belt under the pulling action of the pushing assembly.

5. The mobile target traction device for intelligent safe driving test according to claim 4, characterized in that: The push assembly comprises: A fixed seat, fixedly connected to the driving frame; A push rod, horizontally passed through the fixing seat and slidably matched with the fixing seat; A wheel seat, fixedly connected to one end of the push rod facing the synchronous belt, the wheel seat being used for rotationally connecting to the tensioner body; An operating rod is rotatably connected to the fixing seat, a connecting rod is hingedly connected to a portion of the operating rod close to its rotating shaft, and the connecting rod is hingedly connected to an end of the push rod away from the synchronous belt; When the operating rod swings, the connecting rod forms a pushing force or a pulling force on the push rod.

6. The mobile target traction device for intelligent safe driving test according to claim 5, characterized in that: The operating rod is aligned with the push rod along the axial direction of the push rod, and the connecting rod is an L-shaped bent rod.

7. The mobile target traction device for intelligent safe driving test according to claim 5, characterized in that: The fixing seat is provided with a sliding sleeve, and the push rod passes through the sliding sleeve and is slidably matched with the sliding sleeve.

8. The mobile target traction device for intelligent safe driving test according to claim 1, characterized in that: The bottom of the driving frame is rotatably connected to a guide wheel on both sides of the traction belt, and the two guide wheels roll and contact the outer belt surfaces on both sides of the traction belt respectively; the diameter of the first pulley is greater than the diameter of the second pulley, and the distance formed between the two guide wheels is equal to the diameter of the second pulley.

9. The mobile target traction device for intelligent safe driving test according to claim 1, characterized in that: The bottom of the mobile platform is rotatably connected with two rows of rollers, each of which is in the shape of an elongated cylinder, and there is a space between the two rows of rollers suitable for connecting and passing the traction belt.

10. The mobile target traction device for intelligent safe driving test according to any one of claims 1 to 9, characterized in that: The code computer includes a digital display head, a sensor connected to the digital display head through a signal line, and an induction magnet; wherein the digital display head is arranged on the top of the driving frame, the induction magnet is arranged on the rim of the first pulley, and the sensor is arranged on the bottom wall of the driving frame and corresponds to the position of the induction magnet.

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