Engine performance detection device

Abstract

The invention belongs to the technical field of engine detection instruments for motorcycles, and particularly relates to an engine performance detection device which comprises a frame and an engine detachably connected to the frame, a plurality of first telescopic rods are arranged on the surface of the frame, and the working end of each first telescopic rod is connected with a positioning block abutting against the outer surface of the engine. Road surface simulation assemblies are connected to front and rear wheel shafts of the frame, each road surface simulation assembly comprises a horizontally-arranged movable plate, an adjustable cam used for driving the movable plate to move up and down and a motor used for driving the adjustable cam to rotate, the peripheral side surface of the adjustable cam abuts against the lower surface of the movable plate, and a supporting block is arranged on the surface of one side of the frame; according to the technical scheme, the problem that deviation exists between detected engine data and data in actual use due to the fact that an existing motorcycle engine detection device cannot simulate most road conditions encountered in the actual driving process can be effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine detection instruments for motorcycles, and particularly relates to an engine performance detection device. Background Art

[0002] During the production process of motorcycle engines, a series of tests are usually carried out to ensure that the final quality and performance of the products meet the standards. For example, the appearance size inspection, performance inspection, durability and reliability inspection of motorcycle engines can effectively ensure that the ex-factory standards of each engine are consistent and meet the consumption needs of users. For instance, a Chinese patent discloses a production detection device for motorcycle engines (Patent Publication No.: CN118424558A). The whole device adopts brand-new components and brand-new connection relationships. The engine is fixed by a rotating disk, and then the driving motor drives the engine to rotate. The detection probe in the detection component detects the engine, and the detection results are displayed through a detection table and then transmitted to a computer. The staff can intuitively observe the data to judge whether the dynamic and static balance detection of the engine is qualified.

[0003] Although the above technical solution provides a detection device for motorcycle engines, in actual use, motorcycle engines do not always operate under the best working conditions in the laboratory. Factors such as outdoor temperature, road conditions, and the driving habits of drivers will directly or indirectly affect the service life of the engine. Therefore, simply detecting the dynamic and static balance of motorcycle engines cannot meet the current needs, and there are still deviations between the engine parameters measured under the ideal laboratory environment and those in actual use. Therefore, it is necessary to provide an engine performance detection device that can simulate most road conditions to solve the problem of the limited detection range of the current detection device. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an engine performance detection device to solve the problem that the current motorcycle engine detection device cannot simulate most of the road conditions encountered in actual driving, resulting in deviations between the detected engine data and the data in actual use.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A motorcycle engine performance detection device includes a frame disposed above the ground and an engine detachably connected to the frame. A plurality of first telescopic rods surrounding the engine are provided on the surface of the frame. Each working end of the first telescopic rods is connected with a positioning block for abutting against the outer surface of the engine. The engine is fixed on the frame under the combined action of each positioning block and the first telescopic rods. Road surface simulation components for simulating road conditions are connected to the front and rear wheel axles of the frame. The road surface simulation components include a horizontally arranged movable plate, an adjustable cam for driving the movable plate to move up and down, and a motor for driving the adjustable cam to rotate. The upper surface of each movable plate is movably connected to the front and rear wheel axles of the frame through a ball hinge, and the movable plate is elastically slidably arranged on the ground in the vertical direction. The adjustable cam is rotatably arranged below the movable plate, and the circumferential surface of the adjustable cam abuts against the lower surface of the movable plate. The adjustable cam drives the movable plate to reciprocate up and down under the drive of the motor. A support block for assisting in maintaining the driving posture is provided on one side surface of the frame. The support block is vertically arranged on the ground, and a second telescopic rod is connected between the support block and the frame. The second telescopic rod is horizontally fixed on the frame, and the working end of the second telescopic rod is hinged to the surface of the support block. A load block located above the engine is also detachably connected to the frame.

[0007] Further, a support is provided on the ground below each movable plate. The movable plate is elastically slidably arranged above the support in the vertical direction. The adjustable cam is mounted on the upper surface of the movable plate. The adjustable cam includes a fixed cylinder rotatably arranged on the upper surface of the support, two fixed rings coaxially and spaced apart on the outer ring of the fixed cylinder, and a plurality of first convex blocks elastically slidably arranged on the outer surface of the outer ring along the radial direction of the fixed ring. The two fixed rings are spaced apart along the axial direction of the fixed cylinder, and an activity ring is coaxially rotatably connected to the outer surface of each fixed ring. Any one of the activity rings is power-connected to the motor. The axis in the length direction of each first convex block is parallel to the axis of the fixed cylinder. Both ends in the length direction of each first convex block are slidably connected to the surface of the adjacent activity ring, and all the first convex blocks are arranged around the outer surface of the fixed ring and jointly form a sleeve. A first electromagnet cooperating with the first convex block is provided on the outer surface of the fixed cylinder. The first electromagnet is located directly below the movable plate. When any one of the first convex blocks rotates above the first electromagnet under the drive of the activity ring, the first electromagnet is energized and makes the corresponding first convex block move towards the movable plate.

[0008] Further, a plurality of placement grooves corresponding to the first bumps one by one are circumferentially formed on the adjacent end faces of the two movable rings. The length direction of each placement groove is arranged along the radial direction of the fixed cylinder, and a plurality of stoppers are elastically slidably connected in each placement groove. One end of each stopper abuts against the surface of the first bump; wherein, all the stoppers in each placement groove are stacked along the radial direction of the fixed cylinder, and each stopper moves along the axial direction of the fixed cylinder. When any one of the first bumps moves a certain distance along the radial direction of the fixed cylinder, the plurality of stoppers near the two end faces in the length direction of this first bump extend out of the placement groove and abut against the surface of the first bump to limit the reset of the first bump; second electromagnets fixed on the upper surface of the support are arranged on the two end faces of the fixed cylinder, and the working end of each second electromagnet is close to the adjacent movable ring and is used for adsorbing each stopper moving nearby.

[0009] Further, a plurality of the first electromagnets are provided and are evenly arranged along the circumference of the fixed cylinder. Each first electromagnet is separately electrically connected to a control unit for controlling the magnitude of its magnetic force.

[0010] Further, the surface of one side of each first bump abutting against the movable plate is a smooth and continuous curved surface. A groove matching the shape of the first bump is formed on the lower surface of the movable plate, and a second bump abutting against each first bump is arranged in the groove.

[0011] Further, a fixing column arranged along its radial direction is perpendicularly fixed on the outer surface of each movable ring. A plurality of fixing columns are provided and are arranged at intervals along the circumference of the movable ring, and the number and positions of the fixing columns correspond to the first bumps one by one. Each first bump elastically penetrates through two corresponding fixing columns along the radial direction of the fixed cylinder.

[0012] Further, a blower facing the engine is arranged on one side of the front wheel of the vehicle frame, and the blower is fixedly arranged on the ground and dissipates heat from the engine.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. In the present invention, the motorcycle engine is detachably connected to the motorcycle frame, a road surface simulation assembly is arranged at the front and rear wheel axles of the frame, a load block is installed on the frame, and a support block for maintaining the balance of the frame are provided, so as to simulate the working conditions of the motorcycle during driving to the greatest extent, provide a more real feedback for the performance detection of the engine, and finally improve the accuracy and authenticity of the engine detection data;

[0015] 2. By setting an adjustable cam, most of the road conditions encountered by the front and rear wheels of a motorcycle frame during driving can be effectively simulated. Moreover, shock-absorbing springs are installed on the vehicle, which can more realistically restore the feedback when the front and rear wheels of the frame encounter bumpy roads. Additionally, the engine is clamped and fixed by multiple first telescopic rods, and engines of different sizes or models can be replaced for performance testing, effectively expanding the scope of application of this device.

[0016] Other advantages, objectives, and features of the present invention will be described in the subsequent specification, and to some extent, they will be obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To make the objectives, technical solutions, and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0018] Figure 1 Schematic diagram of the overall structure of the frame of the present invention Figure 1 ;

[0019] Figure 2 Schematic diagram of the overall structure of the frame of the present invention Figure 2 ;

[0020] Figure 3 Front view of the overall structure of the frame of the present invention;

[0021] Figure 4 Schematic diagram of the adjustable cam structure of the present invention;

[0022] Figure 5 Exploded view of the adjustable cam part of the present invention;

[0023] Figure 6 For Figure 5 Enlarged view at B in

[0024] Figure 7 For Figure 4 Cross-sectional view taken along A-A in

[0025] Figure 8 For Figure 7 Enlarged view at C in

[0026] Figure 9 For Figure 7 Enlarged view at D in

[0027] Figure 10 Schematic diagram of the structure of the fixed cylinder and fixed column of the present invention;

[0028] Figure 11 Schematic diagram of the movable plate structure of the present invention.

[0029] The markings in the attached drawings are as follows:

[0030] 1. Frame; 2. Engine; 3. First telescopic rod; 4. Positioning block; 5. Movable plate; 6. Adjustable cam; 601. Fixed cylinder; 602. Fixed ring; 603. First convex block; 604. Movable ring; 605. First electromagnet; 606. Stopper; 7. Support block; 8. Second telescopic rod; 9. Load block; 10. Support; 11. Second electromagnet; 12. Second convex block; 13. Fixed block; 14. Fixed column. Detailed implementation manners

[0031] As Figures 1 to 11 shown,

[0032] An engine performance detection device includes a frame 1 arranged above the ground and an engine 2 detachably connected to the frame 1 (a twin-cylinder engine is shown in the figure). The frame 1 includes a frame 1 body and shock-absorbing springs arranged at the front and rear positions of the frame 1 body. A plurality of first telescopic rods 3 surrounding the engine 2 are fixed on the surface of the frame 1 (only three first telescopic rods 3 are shown in the figure, and the appropriate number of first telescopic rods 3 can be selected according to the size of the engine 2). The first telescopic rods 3 adopt hydraulic telescopic cylinders with large clamping force. Each of the first telescopic rods 3 is fixed to the frame 1 by bolts or reinforcing blocks. The working end of each first telescopic rod 3 is connected with a positioning block 4 for abutting against the outer surface of the corresponding engine 2, and the engine 2 is fixed to the frame 1 under the combined action of each positioning block 4 and the first telescopic rods 3. Road surface simulation components for simulating road conditions are connected to the front and rear wheel axles of the frame 1. The road surface simulation components include a horizontally arranged movable plate 5, an adjustable cam 6 for driving the movable plate 5 to move up and down, and a motor (not shown in the figure) for driving the adjustable cam 6 to rotate; the upper surface of each movable plate 5 is movably connected to the front and rear wheel axles of the frame 1 through ball joints, and the movable plate 5 is elastically slidably arranged on the ground in the vertical direction. The adjustable cam 6 is rotatably arranged below the movable plate 5, and the circumferential surface of the adjustable cam 6 abuts against the lower surface of the movable plate 5. The motor is fixed on the ground. The adjustable cam 6 rotates under the drive of the motor and drives the movable plate 5 to reciprocate up and down to simulate the situation of road surface bumps. A support block 7 for assisting the frame 1 to maintain a normal driving posture is arranged on one side surface of the frame 1. The support block 7 is in a "U" shape and is vertically fixed on the ground, and a second telescopic rod 8 is connected between the support block 7 and the frame 1. The second telescopic rod 8 is horizontally arranged and is fixed to the frame 1 by bolts. The working end of the second telescopic rod 8 is hinged to the surface of the support block 7 in the vertical plane, and the frame 1 can drive the second telescopic rod 8 to move a certain distance in the vertical direction. A load block 9 located above the engine 2 is also detachably connected to the frame 1 by bolts.

[0033] As shown in the figure, when it is necessary to detect the performance of the motorcycle engine 2, first move the engine 2 near the frame 1 and place it between the working ends of the three first telescopic rods 3. Subsequently, control the working ends of each first telescopic rod 3 to extend and jointly clamp the engine 2, so that the engine 2 is fixedly connected to the frame 1. Connect the engine 2 through external wiring harnesses and various pipelines and enable the engine 2 to work properly. Then control each motor and drive the adjustable cam 6 to rotate. While the adjustable cam 6 rotates, it will drive the movable plate 5 to reciprocate up and down. At the same time, when the movable plate 5 moves, it will drive the front and rear wheel axles of the corresponding frame 1 to vibrate up and down through the ball joint. Of course, the shock-absorbing springs at the front and rear of the frame 1 will buffer part of the impact force brought by the movable plate 5 and truly simulate the potholed road surface or gravel road surface encountered during motorcycle driving. It is also possible to indirectly control the frequency of the up and down movement of the front and rear wheel axles of the frame 1 by controlling the rotation speed of each motor, further simulating various road conditions encountered during motorcycle driving; and by controlling the working end of the second telescopic rod 8 to extend or retract, it is possible to drive the frame 1 to approach or move away from the hinge point between the second telescopic rod 8 and the support block 7, thereby realizing the left and right swing of the vehicle body when driving a motorcycle. Since the front and rear wheel axles of the frame 1 are movably connected to the movable plate 5 through ball joints, when the frame 1 swings, it will not affect the movable plate 5 to drive the front and rear wheel axles of the frame 1 to move up and down. Through the mutual cooperation of the road surface simulation component, the support block 7 and the second telescopic rod 8, it is possible to realize most of the road surface feedback encountered during the driving of the frame 1 and the driving posture of the frame 1, and thereby indirectly provide the engine 2 with a working environment under different working conditions. Of course, multiple sensors, such as vibration sensors, fuel quantity sensors, and rotational speed sensors and other detection devices, are installed on the frame 1 or on the wiring harnesses and pipelines that provide power for the engine 2, and can real-time monitor various parameters of the engine 2 when moving together with the frame 1, providing reliable data for optimizing the performance of the engine 2.

[0034] In this embodiment, supports 10 fixed to the ground are arranged at intervals below each of the movable plates 5. Four struts arranged in a rectangle in the horizontal plane are provided on the upper surface of each support 10. The movable plates 5 elastically slide vertically on the struts. Fixed blocks 13 are rotatably connected to both end faces of the adjustable cam 6. The fixed blocks 13 are vertically fixed on the upper surface of the support 10 and the adjustable cam 6 is mounted on the upper surface of the movable plate 5. Among them, the adjustable cam 6 includes a fixed cylinder 601 rotatably arranged on the upper surface of the support 10, two fixed rings 602 coaxially and spaced apart on the outer ring of the fixed cylinder 601, and a plurality of first convex blocks 603 elastically sliding radially on the outer ring surface of the fixed ring 602. The two fixed rings 602 are arranged at intervals along the axial direction of the fixed cylinder 601. A movable ring 604 is rotatably connected to the outer ring surface of each fixed ring 602 coaxially. A toothed ring is coaxially fixed to the outer ring surface of any one of the movable rings 604, and the toothed ring is power-connected to the output end of the motor. Each of the first convex blocks 603 is strip-shaped and arranged between the two movable rings 604. The axis in the length direction of the first convex block 603 is parallel to the axis of the fixed cylinder 601. Both ends in the length direction of each first convex block 603 are slidably connected to the surface of the adjacent movable ring 604. All the first convex blocks 603 are arranged around the outer ring surface of the fixed ring 602 and jointly form a sleeve. A first electromagnet 605 matched with the first convex block 603 is provided on the outer ring surface of the fixed cylinder 601. The first electromagnet 605 is located directly below the movable plate 5. When any one of the first convex blocks 603 rotates above the first electromagnet 605 driven by the movable ring 604, the first electromagnet 605 is energized and the corresponding first convex block 603 moves towards the movable plate 5.

[0035] As shown in the figure, in order to further simulate different bumpy situations encountered when the wheel travels on the road surface, a plurality of adjustable cams 6 are provided and are individually movable first bumps 603. When the motor drives the movable ring 604 to rotate, since each first bump 603 is slidably arranged on the surface of the movable ring 604 along the radial direction of the fixed cylinder 601, therefore, when one movable ring 604 rotates, it will drive another movable ring 604 to rotate synchronously through the first bump 603. At this time, the first electromagnet 605 is energized, and the magnetism of each first bump 603 rotating above the first electromagnet 605 is opposite to the magnetism generated by the first electromagnet 605. Since the first electromagnet 605 is arranged directly below the movable plate 5, the first bump 603 located directly below the movable plate 5 moves away from the first electromagnet 605 and pushes the movable plate 5 upward. When this first bump 603 continues to rotate and is no longer corresponding to the first electromagnet 605, the first bump 603 resets; and by controlling the first electromagnet 605 to be reciprocally intermittently energized and de-energized, it can be realized that the first bump 603 rotating above the first electromagnet 605 abuts or does not abut the surface of the movable plate 5. Moreover, the energization magnitude of the first electromagnet 605 can be adjusted to control the magnetic field intensity, indirectly controlling the distance of the first bump 603 away from the first electromagnet 605, and realizing the distance of the abutting movable plate 5 moving upward, simulating different vibration effects generated after the wheel encounters potholes or gravel of different sizes on the road surface, effectively increasing the range of the adjustable cam 6 to simulate different road conditions.

[0036] In this embodiment, a plurality of placement grooves corresponding to the first bumps 603 one by one are circumferentially formed on both adjacent end faces of the two movable rings 604. The placement grooves are all strip-shaped, the length direction of each placement groove is arranged along the radial direction of the fixed cylinder 601, and a plurality of stoppers 606 are elastically slidably connected in each placement groove. One end of each stopper 606 abuts against the surface of the first bump 603; among them, all the stoppers 606 in each placement groove are stacked along the radial direction of the fixed cylinder 601, and each stopper 606 moves along the axial direction of the fixed cylinder 601. When any one of the first bumps 603 moves a certain distance along the radial direction of the fixed cylinder 601 and away from the fixed cylinder 601, a plurality of stoppers 606 near the two end faces in the length direction of this first bump 603 extend out of the placement groove and abut against the surface of the first bump 603 to limit the reset of the first bump 603; second electromagnets 11 are arranged on both end faces of the fixed cylinder 601 and located on the surface of the fixed block 13. The working end of each second electromagnet 11 is close to the adjacent movable ring 604 and is used to adsorb each stopper 606 moving nearby to reset.

[0037] As shown in the figure, when the first bump 603 moves above the first electromagnet 605, the first bump 603 moves away from the first electromagnet 605 under the action of the magnetic force of the first electromagnet 605. Since the magnitude of the magnetic force of the first electromagnet 605 is controllable, the distance that the first bump 603 moves radially along the fixed cylinder 601 can be indirectly adjusted. When the first bump 603 moves away from the fixed cylinder 601 by a certain distance, a part of the placement grooves at both ends of the length of the first bump 603 will be exposed. At this time, a plurality of stoppers 606 located in the placement grooves and not in contact with the first bump 603 slide out of the placement grooves, and the surface of one of the stoppers 606 that slides out of the placement groove is in contact with the surface of the first bump 603, and restricts the first bump 603 from moving towards the fixed cylinder 601. Therefore, when this bump that is restricted from resetting abuts against the movable plate 5, it can drive the movable plate 5 to move upward more stably, effectively preventing the situation that the first bump 603 will displace after being stressed due to inaccurate adjustment of the magnetic force of the first electromagnet 605 when the first bump 603 abuts against the movable plate 5. By physically limiting the first bump 603 with a plurality of stoppers 606, the stability of the first bump 603 is ensured. And when each first bump 603 moves between the two second electromagnets 11 driven by the movable ring 604, the second electromagnets 11 are all energized and adsorb each adjacent stopper 606, so that each stopper 606 moves away from the first stopper 606 and resets. At this time, each stopper 606 is located in the placement groove, and the first stopper 606 resets under the action of the spring. The specific structure can be referred to Figure 9 and Figure 10 shown; through the arrangement of the stoppers 606 and the second electromagnets 11, the stability when each first stopper 606 abuts against the movable plate 5 can be effectively improved, the accuracy during the operation of the road surface simulation assembly is ensured, and more accurate data are provided for the performance detection of the engine 2.

[0038] In this embodiment, a plurality of the first electromagnets 605 are provided and are uniformly arranged along the circumferential direction of the fixed cylinder 601. Each of the first electromagnets 605 is separately electrically connected to a control unit for controlling the magnitude of its magnetic force.

[0039] As shown in the figure, a plurality of first electromagnets 605 are fixedly arranged in a semi-circular ring shape on the outer surface of the fixed cylinder 601. By separately controlling the magnitude of the magnetic force of each first electromagnet 605, the number of first bumps 603 that can be individually regulated can be increased, which is not only redundant in structure but also improves the accuracy of controlling each first bump 603.

[0040] In this embodiment, one side surface of each of the first bumps 603 abuts against the movable plate 5 and is a smooth and continuous curved surface. A groove matching the shape of the first bump 603 is formed in the lower surface of the movable plate 5, and a second bump 12 that abuts against each of the first bumps 603 is arranged in the groove. The surface of the second bump 12 is also composed of a smooth and continuous curved surface.

[0041] As shown in the figure, the surfaces of the first bump 603 and the second bump 12 that abut against each other are both smooth and continuous curved surfaces, which can improve the smoothness when they abut against each other, reduce the friction force, and enable the movable plate 5 to perform smooth reciprocating up and down motion according to a preset program.

[0042] In this embodiment, a fixing column 14 arranged along its radial direction is vertically fixed on the outer surface of each of the movable rings 604. There are multiple fixing columns 14, which are arranged at intervals along the circumferential direction of the corresponding movable ring 604. The number and positions of the fixing columns 14 correspond one by one to the first bumps 603. Each of the first bumps 603 elastically penetrates through two fixing columns 14 in the radial direction of the fixed cylinder 601 along its length direction.

[0043] As shown in the figure, each of the first bumps 603 elastically penetrates through two fixing columns 14, which can not only limit the movement direction of the first bump 603, but also effectively improve its stability during movement.

[0044] In this embodiment, a blower (not shown in the figure) facing the engine 2 is arranged on one side of the front wheel of the vehicle frame 1. The blower is fixedly arranged on the ground, and the engine 2 is cooled by the blower to simulate the heat exchange formed by the surface of the engine 2 hitting the air when the motorcycle is being driven.

[0045] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An engine performance detection device, comprising a frame (1) arranged above the ground and an engine (2) detachably connected to the frame (1), characterized in that: The surface of the frame (1) is provided with a plurality of first telescopic rods (3) surrounding the engine (2), wherein the working end of each of the first telescopic rods (3) is connected to a positioning block (4) for abutting against the outer surface of the engine (2), and the engine (2) is fixed to the frame (1) under the joint action of each positioning block (4) and the first telescopic rod (3), and the front and rear wheel axles of the frame (1) are connected to a road surface simulation component for simulating road conditions, and the road surface simulation component includes a horizontally arranged movable plate (5), an adjustable cam (6) for driving the movable plate (5) to move up and down, and a motor for driving the adjustable cam (6) to rotate; the upper surface of each movable plate (5) is movably connected to the front and rear wheel axles of the frame (1) through a ball joint, and the movable plate ( 5) is elastically slidably arranged on the ground in a vertical direction, the adjustable cam (6) is rotatably arranged below the movable plate (5), and the peripheral surface of the adjustable cam (6) is in contact with the lower surface of the movable plate (5), and the adjustable cam (6) drives the movable plate (5) to reciprocate up and down under the drive of the motor; a support block (7) is provided on one side surface of the frame (1) for assisting it in maintaining a driving posture, the support block (7) is vertically arranged on the ground, and a second telescopic rod (8) is connected between the support block (7) and the frame (1), the second telescopic rod (8) is horizontally fixed on the frame (1), and the working end of the second telescopic rod (8) is hinged to the surface of the support block (7), and the frame (1) is also detachably connected with a load block (9) located above the engine (2).

2. An engine performance detection device according to claim 1, characterized in that: A support (10) fixed on the ground is provided below each of the movable plates (5), and the movable plates (5) elastically slide above the support (10) in a vertical direction, and the adjustable cam (6) is mounted on the upper surface of the movable plate (5), wherein the adjustable cam (6) comprises a fixed cylinder (601) rotatably arranged on the upper surface of the support (10), two fixed rings (602) coaxially and spaced apart on the outer ring of the fixed cylinder (601), and a plurality of first protrusions (603) elastically sliding on the outer ring surface of the fixed ring (602) along the radial direction, the two fixed rings (602) are spaced apart along the axial direction of the fixed cylinder (601), and the outer ring surface of each fixed ring (602) is also coaxially rotatably connected to a movable ring (604), and any of the movable rings (604) is connected to the power of the motor. The axis of each first protrusion (603) in the length direction is parallel to the axis of the fixed cylinder (601), and both ends of each first protrusion (603) in the length direction are slidably connected to the surface of the adjacent movable ring (604), and all the first protrusions (603) are arranged around the outer ring surface of the fixed ring (602) and together form a sleeve, and the outer ring surface of the fixed cylinder (601) is provided with a first electromagnet (605) that cooperates with the first protrusion (603), and the first electromagnet (605) is located directly below the movable plate (5), and when any first protrusion (603) is driven by the movable ring (604) to rotate to the top of the first electromagnet (605), the first electromagnet (605) is energized and causes the corresponding first protrusion (603) to move toward the movable plate (5).

3. An engine performance detection device according to claim 2, characterized in that: The two adjacent end surfaces of the two movable rings (604) are circumferentially provided with a plurality of placement grooves corresponding to the first protrusions (603), the length direction of each placement groove is arranged along the radial direction of the fixed cylinder (601), and a plurality of stoppers (606) are elastically slidably connected in each placement groove, and one end of each stopper (606) abuts against the surface of the first protrusion (603); wherein all the stoppers (606) in each placement groove are stacked and arranged along the radial direction of the fixed cylinder (601), and each stopper (606) moves along the axial direction of the fixed cylinder (601). When any of the first protrusions (603) moves a certain distance radially along the fixed tube (601), a plurality of stoppers (606) close to both end faces of the first protrusion (603) in the length direction extend out of the placement groove and abut against the surface of the first protrusion (603) to limit the first protrusion (603) from resetting; both end faces of the fixed tube (601) are provided with second electromagnets (11) fixed on the upper surface of the support (10), and the working end of each of the second electromagnets (11) is close to the adjacent movable ring (604) and is used to absorb and move to each of the nearby stoppers (606).

4. An engine performance detection device according to claim 3, characterized in that: The first electromagnet (605) is provided in multiple pieces and is evenly arranged along the circumference of the fixed cylinder (601), and each of the first electromagnets (605) is individually electrically connected to a control unit for controlling the magnitude of its magnetic force.

5. An engine performance detection device according to claim 4, characterized in that: The side surface of each first protrusion (603) abutting against the movable plate (5) is a smooth and continuous curved surface, the lower surface of the movable plate (5) is provided with a groove matching the shape of the first protrusion (603), and a second protrusion (12) abutting against each first protrusion (603) is provided in the groove.

6. An engine performance detection device according to claim 5, characterized in that: A fixing column (14) arranged along its radial direction is vertically fixed on the outer surface of each movable ring (604); the fixing columns (14) are provided in a plurality and are arranged at intervals along the circumference of the movable ring (604); the number and position of the fixing columns (14) correspond one-to-one to the first protrusions (603); each of the first protrusions (603) is elastically penetrated on two corresponding fixing columns (14) along the radial direction of the fixing tube (601).

7. An engine performance detection device according to claim 6, characterized in that: A fan facing the engine (2) is provided on one side of the front wheel of the vehicle frame (1), and the fan is fixed on the ground and dissipates heat for the engine (2).

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