A method and test bench for testing pedal riding ability of electric bicycle

Abstract

The present invention discloses a pedal riding ability test method and test bench for an electric bicycle, the method comprising: measuring the whole vehicle data of the electric bicycle to be tested; placing a front wheel support device of the electric bicycle to be tested on a dynamometer; connecting a servo motor to the middle shaft of the electric bicycle to be tested through a pedal connector of the electric bicycle pedal riding ability test bench; setting a corresponding average standardized power for the middle shaft according to the transmission ratio and crank length in the whole vehicle data; the electric bicycle pedal riding ability test bench simulates human riding, and the riding data is measured to evaluate whether the riding ability of the electric bicycle to be tested is qualified. The present invention simulates human riding through the pedal riding ability test bench of the electric bicycle to test the pedal riding ability of the electric bicycle, which not only greatly improves the test efficiency and shortens the test cycle, but also makes the test results objective and fair, eliminating the interference of external uncertain factors.

Description

Technical Field

[0001] The invention relates to the technical field of electric bicycle testing, and in particular to a pedaling riding ability testing method and a test bench for an electric bicycle. Background Art

[0002] With the release of the national standard GB 17761-2018 "Safety Technical Specifications for Electric Bicycles", Article 6.1.4 stipulates the "pedal riding ability" as follows: The pedal riding ability of electric bicycles shall meet the following requirements:

[0003] a) The pedaling distance in 30 minutes is greater than or equal to 5 km;

[0004] b) The maximum distance between the outer sides of the two cranks is less than or equal to 300mm;

[0005] c) The front end of the saddle shall not exceed the center line of the center shaft in the horizontal direction.

[0006] The test method for item a) "pedaling distance" is as follows:

[0007] Under the test conditions specified in 7.2.1.1, set up a test section on the test road, ride for 30 minutes using only human power, and measure the riding distance.

[0008] This test mainly uses human riding. In a verification test, the inspector and the rider sent by the company rode the same electric bicycle for 1 km, and the riding time was converted to 5 km by multiplying the riding time by 5; the data for 5 km pedaling were 41.5 minutes and 24 minutes respectively, and the data were very different; this test is related to manpower, and the physical strength varies greatly, and even related to the individual's state; different people riding the same model, and the same person riding with different mentality, the results are inconsistent, and even two completely different conclusions appear. Summary of the invention

[0009] The purpose of the present invention is to provide a method and a test bench for testing the pedaling ability of an electric bicycle in order to solve the problem that the pedaling ability of an existing electric bicycle varies greatly among different people and is difficult to accurately evaluate.

[0010] The purpose of the present invention is to be achieved through the following technical solutions:

[0011] A method for testing the pedaling ability of an electric bicycle, the method comprising:

[0012] S101, measuring vehicle data of the electric bicycle to be tested;

[0013] S102, placing the front wheel holding device of the electric bicycle to be tested on a dynamometer;

[0014] S103, connecting the servo motor to the central axis of the electric bicycle to be tested through a pedal connector of the electric bicycle pedal riding ability test bench;

[0015] S104, setting a corresponding average standardized power for the middle axis according to the transmission ratio and crank length of the electric bicycle to be tested in the whole vehicle data;

[0016] S105. The electric bicycle pedal riding ability test bench simulates human riding, and measures riding data to evaluate whether the riding ability of the electric bicycle to be tested is qualified.

[0017] In particular, the vehicle data of the electric bicycle to be tested includes but is not limited to the vehicle mass, the position of the center of the middle axis and the center of the saddle (human body seating point), the position of the center of the saddle (human body seating point) and the handlebar, the length of the crank, the width of the left and right cranks, the transmission ratio of the flywheel and the sprocket, and the specifications of the tire (diameter and width).

[0018] Based on the above-mentioned pedaling riding ability test method of an electric bicycle, the present invention also discloses a pedaling riding ability test bench for an electric bicycle, the test bench comprising a test bench body, the test bench body comprising a base, a frame mounted on the base, a support mounted on the frame, a servo motor, a reducer, a torque sensor and a pedal connector for connecting pedals mounted on the support, the output shaft of the servo motor is transmission-connected to the input shaft of the reducer, the output shaft of the reducer is transmission-connected to one end of the torque sensor through a coupling, the other end of the torque sensor is transmission-connected to a main shaft, the main shaft is arranged in a horizontal direction, and the main shaft is transmission-connected to the pedal connector through a universal joint.

[0019] Particularly, the support is mounted on the frame so as to be movable up and down.

[0020] Particularly, a screw rod is installed on the frame, the screw rod is arranged in a vertical direction, a screw rod nut is threadedly connected to the screw rod, and the screw rod nut is fixedly connected to the support.

[0021] Particularly, one end of the screw rod is connected with a handle.

[0022] Particularly, a guide rod is mounted on the frame, the guide rod is arranged in a vertical direction, and a guide sleeve which is slidably matched with the guide rod is fixed on the support.

[0023] In particular, the arrangement direction of the main axis is defined as the first direction, the direction perpendicular to the first direction in the same plane is defined as the second direction, a slide rail is arranged on the base along the second direction, and a slider slidably matched with the slide rail is installed at the bottom of the frame.

[0024] Compared with the traditional electric bicycle pedal riding ability test method using human riding, the electric bicycle pedal riding ability test method proposed in the present invention simulates human riding through the electric bicycle pedal riding ability test bench to test the electric bicycle pedal riding ability, which not only greatly improves the test efficiency and shortens the test cycle, but also makes the test results more objective and fair, eliminating the interference of external uncertain factors. The electric bicycle pedal riding ability test bench proposed in the present invention has a simple structure and is easy to implement. It can simulate human riding and has the advantages of labor saving, accuracy and effectiveness. Its support can move up and down, and the frame can move horizontally, and can be adjusted to adapt to different models, and has the characteristics of good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a flow chart of a method for testing the pedaling ability of an electric bicycle;

[0026] Figure 2 This is a structural schematic diagram of a pedal riding ability test bench for an electric bicycle, in which: 1. servo motor; 2. reducer; 3. torque sensor; 4. pedal connector; 5. support; 6. coupling; 7. main shaft; 8. base; 9. frame; 10. screw; 11. handle; 12. slide rail; 13. slider; 14. universal joint; 15. outer spherical bearing with seat. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood. It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a centering element at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] Embodiment 1

[0029] Please refer to Figure 1 As shown, Figure 1 The figure is a flow chart of a method for testing the pedaling ability of an electric bicycle.

[0030] The pedaling riding ability test method of the electric bicycle in this embodiment includes:

[0031] S101. Measure vehicle data of the electric bicycle to be tested.

[0032] Specifically, the vehicle data of the electric bicycle to be tested in this embodiment includes but is not limited to the vehicle mass, the position of the center of the middle axis and the center of the saddle (human body sitting point), the position of the center of the saddle (human body sitting point) and the handlebar, the length of the crank, the width of the left and right cranks, the transmission ratio of the flywheel and the sprocket, and the specifications of the tire (diameter and width).

[0033] S102, placing the front wheel holding device of the electric bicycle to be tested on a dynamometer.

[0034] S103, connecting the servo motor to the central axis of the electric bicycle to be tested through the pedal connector of the electric bicycle pedal riding ability test bench.

[0035] S104, setting a corresponding average standardized power for the center axis according to the transmission ratio and crank length of the electric bicycle to be tested in the whole vehicle data.

[0036] Specifically, in this embodiment, for vehicles with a transmission ratio of 2:1, the recommended range of the average maximum standardized power of the central axis is 0.65W / kg to 0.7W / kg; other transmission ratio types can be adjusted according to the corresponding coefficient (a suitable value can be given based on the standard pedal force).

[0037] S105. The electric bicycle pedal riding ability test bench simulates human riding, and measures riding data to evaluate whether the riding ability of the electric bicycle to be tested is qualified.

[0038] The pedal riding ability test method of the electric bicycle proposed in this embodiment is the result obtained after several actual tests and analyses. A lot of verification and analysis work has been carried out for each parameter in the vehicle data. The following is a brief description of the more relevant points:

[0039] Regarding the uncertainty components, the uncertainty components of riding power are composed of riding uncertainty, instrument measurement uncertainty, and display instrument resolution uncertainty. The errors caused by the latter two uncertainties are much lower than riding uncertainty and have little impact. In order to simplify the evaluation model, only riding uncertainty is considered in this embodiment. The test results show that the total mass of the vehicle has nothing to do with the standardized power; when a model is uncomfortable to ride, the saddle height has little effect on riding; the data will decrease as the riding time increases, and the rider gradually adapts to the riding method, and the influence of the saddle height can be ignored; for a model, the flexibility of installing the middle axis will determine whether the riding function is light or not; as the riding time increases, the steel ball of the middle axis is fully lubricated, the riding resistance is reduced, and the riding power will gradually decrease; this also means that the first time an electric bicycle is ridden, the power consumption will be large. Considering that users almost never use the human riding mode, but also taking into account the actual situation of the enterprise, it is recommended to first conduct a run-in during the assessment.

[0040] For models with a transmission ratio of 2:1 and a crank length greater than 115mm, if the ideal pedal force is greater than 90N, it will feel difficult to ride; the average maximum standardized power of the middle axis obtained from the experiment is recommended to be in the range of 0.65W / kg to 0.7W / kg. The actual pedaling process is alternating between two feet. During the riding process, experienced riders will adopt a reasonable riding method to reduce unnecessary physical energy consumption. When the force cannot output a large torque, the force is only to ensure the normal rotation of the crank; this means that between 0°~65° and 115°~180°, the force is almost close to zero. At 65°~115°, the maximum pedal force is output to ensure that the riding is carried out according to the plan. Therefore, the actual riding speed is a fluctuating process; but considering that this distance is very short and the impact is slight, it is studied as a uniform motion; at the same time, the pedal force between 0°~65° and 115°~180° is also ignored. The initial power value is the average power within the cycle; corresponding to the above formula, the average power within the half cycle is: M0 = F0 × L × π. During the force application process, intermittent force application is more in line with the actual state; but considering the simplicity of the test, it is more convenient to consider uniform force.

[0041] Before the pedal riding ability test of the electric bicycle in this embodiment begins, a riding run-in is required, for example, 1 km; from the analysis of the test data, it can be seen that after riding 1 km / h, the data area is basically stable. In addition, since temperature affects riding efficiency, it is recommended to place it in a laboratory environment at (25±5)℃ for 2 hours before the test.

[0042] The pedaling riding ability test method of an electric bicycle proposed in the present invention simulates human riding through a pedaling riding ability test bench of an electric bicycle to test the pedaling riding ability of an electric bicycle, which not only greatly improves the test efficiency and shortens the test cycle, but also makes the test results more objective and fair, and eliminates the interference of external uncertain factors.

[0043] Embodiment 2

[0044] like Figure 2 As shown, Figure 2 The structure diagram of the pedal riding ability test bench of the electric bicycle in the above-mentioned embodiment 1. In this embodiment, the pedal riding ability test bench of the electric bicycle specifically includes a test bench body, the test bench body includes a base 8, a frame 9 is installed on the base 8, a support 5 is installed on the frame 9, a servo motor 1, a reducer 2, a torque sensor 3 and a pedal connector 4 for connecting the pedal are installed on the support 5, the output shaft of the servo motor 1 extends to the right end and is connected to the input shaft of the reducer 2, the output shaft of the reducer 2 extends to the right end and is connected to the left end of the torque sensor 3 through a coupling 6, the right end of the torque sensor 3 is connected to the main shaft 7, the main shaft 7 is rotatably connected to the support 5 through a seated outer spherical bearing 15, and the main shaft 7 is arranged in the left and right directions, and the right end of the main shaft 7 is connected to the pedal connector 4 through a universal joint 14. In this embodiment, the support 5 can be installed on the frame 9 so as to move up and down; specifically, a screw rod 10 is installed on the frame 9, and the screw rod 10 is arranged in the vertical direction. A screw nut is threadedly connected to the screw rod 10, and the screw nut is fixedly connected to the support 5. A guide rod is installed on the frame 9, and the guide rod is arranged in the vertical direction. A guide sleeve that slides with the guide rod is fixed on the support 5.

[0045] For ease of operation, in this embodiment, one end of the screw rod 10 is connected to a handle 11. In order to improve versatility, in this embodiment, a slide rail 12 is arranged on the base 8 along the front-to-back direction, and a slider 13 that slidably cooperates with the slide rail 12 is installed at the bottom of the frame 9. During the test, the servo motor 1 is connected to the middle shaft of the electric bicycle through the pedal connector 4, and the corresponding average standardized power is set for the middle shaft for models with different transmission ratios and crank lengths, thereby achieving the purpose of simulating human riding.

[0046] The pedal riding ability test bench for an electric bicycle proposed by the present invention has a simple structure and is easy to implement. It can simulate human riding and has the advantages of being labor-saving, accurate and effective. Its support can move up and down, and its frame can move horizontally, so it can be adjusted to adapt to different vehicle models, and has the characteristics of good versatility.

[0047] Those skilled in the art can understand that all or part of the above embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the process of the above-mentioned embodiments of each method. The storage medium can be a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0048] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A test bench for testing the pedaling ability of an electric bicycle, comprising a test bench body, characterized in that: The test bench body includes a base, a frame is installed on the base, a support is installed on the frame, a servo motor, a reducer, a torque sensor and a pedal connector for connecting a pedal are installed on the support, the output shaft of the servo motor is drivingly connected to the input shaft of the reducer, the output shaft of the reducer is drivingly connected to one end of the torque sensor through a coupling, the other end of the torque sensor is drivingly connected to a main shaft, the main shaft is arranged in a horizontal direction, and the main shaft is drivingly connected to the pedal connector through a universal joint; The support is mounted on the frame so as to be movable up and down; A screw rod is installed on the frame, the screw rod is arranged in the vertical direction, a screw rod nut is threadedly connected to the screw rod, and the screw rod nut is fixedly connected to the support; One end of the screw rod is connected with a handle; A guide rod is installed on the frame, the guide rod is arranged in the vertical direction, and a guide sleeve that is slidably matched with the guide rod is fixed on the support; The arrangement direction of the main axis is defined as a first direction, and a direction perpendicular to the first direction in the same plane is defined as a second direction. A slide rail is arranged on the base along the second direction, and a slider slidably matched with the slide rail is installed at the bottom of the frame. The main shaft is rotatably connected to the support through an outer spherical bearing with a seat.

2. A method for testing the pedaling ability of an electric bicycle, using the pedaling ability testing test bench for an electric bicycle as claimed in claim 1, characterized in that: The method includes: S101, measuring vehicle data of the electric bicycle to be tested; S102, placing the front wheel holding device of the electric bicycle to be tested on a dynamometer; S103, connecting the servo motor to the central axis of the electric bicycle to be tested through a pedal connector of the electric bicycle pedal riding ability test bench; S104, setting a corresponding average standardized power for the middle axis according to the transmission ratio and crank length of the electric bicycle to be tested in the whole vehicle data; S105, the electric bicycle pedal riding ability test bench simulates human riding, and measures riding data to evaluate whether the riding ability of the electric bicycle to be tested is qualified; The vehicle data of the electric bicycle to be tested includes but is not limited to the vehicle mass, the position of the center of the middle axis and the center of the saddle, the position of the center of the saddle and the handlebar, the length of the crank, the width of the left and right cranks, the transmission ratio of the flywheel and the sprocket, and the specifications of the tire.

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