Engine rotating speed testing device

Abstract

The utility model provides an engine rotating speed testing device, and belongs to the field of rotating speed testing. The engine rotating speed testing device comprises a first induction coil, a second induction coil, a first switch, an amplification module, a filtering module, a shaping module, a counting module, a timing module, a central control module, an engine parameter selection module and a display module. The amplification module is respectively connected with the first induction coil, the second end of the first switch and the filtering module; the second induction coil is connected with the first end of the first switch; the shaping module is respectively connected with the filtering module and the counting module; the counting module is respectively connected with the timing module, the central control module and the control end of the first switch; the central control module is respectively connected with the engine parameter selection module and the display module; the first switch is a single-pole single-throw switch; the first switch is a normally open switch. The accuracy and reliability of engine speed testing can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of rotational speed testing, and particularly to an engine rotational speed testing device. Background Art

[0002] During the research, development, debugging, and optimization of engines, rotational speed testing is a crucial step. The rotational speed directly reflects the number of work cycles of the engine per unit time; by testing the rotational speed, the power output ability of the engine under different working conditions can be understood.

[0003] Currently, for the testing of engine rotational speed, it is mostly detected by obtaining the high-voltage ignition signal. During this process, when the ignition frequency of the engine is high, the detection accuracy will decrease, and at the same time, the lack of adaptation to environmental changes leads to certain errors in the detection results.

[0004] Therefore, there is an urgent need for a reliable and accurate engine rotational speed testing device. Utility Model Content

[0005] The embodiments of the present disclosure provide an engine rotational speed testing device to solve the problem of low testing accuracy of engine rotational speed.

[0006] The embodiments of the present disclosure provide an engine rotational speed testing device, including: a first induction coil, a second induction coil, a first switch, an amplification module, a filtering module, a shaping module, a counting module, a timing module, a central control module, an engine parameter selection module, and a display module;

[0007] The amplification module is respectively connected to the first induction coil, the second end of the first switch, and the filtering module;

[0008] The second induction coil is connected to the first end of the first switch;

[0009] The shaping module is respectively connected to the filtering module and the counting module;

[0010] The counting module is respectively connected to the timing module, the central control module, and the control end of the first switch;

[0011] The central control module is respectively connected to the engine parameter selection module and the display module;

[0012] The first switch is a single-pole single-throw switch;

[0013] The first switch is a normally open switch.

[0014] In an exemplary embodiment of the present disclosure, the amplification module includes: a first operational amplifier, a second operational amplifier;

[0015] The first operational amplifier is respectively connected to the first induction coil and the filtering module;

[0016] The second operational amplifier is respectively connected to the second end of the first switch and the filtering module.

[0017] In an exemplary embodiment of the present disclosure, an engine speed testing device further includes: a magnetic field sensor module;

[0018] The magnetic field sensor module is connected to the filtering module;

[0019] The filtering module includes: a first high-pass filter, a second high-pass filter, a second switch, a third switch, a first mean filter, and a second mean filter;

[0020] Both the second switch and the third switch are single-pole double-throw switches;

[0021] The fixed end of the second switch is connected to the first high-pass filter, the first moving end is connected to the shaping module, the second moving end is connected to the first mean filter, and the control end is connected to the magnetic field sensor module;

[0022] The fixed end of the third switch is connected to the second high-pass filter, the first moving end is connected to the shaping module, the second moving end is connected to the second mean filter, and the control end is connected to the magnetic field sensor module;

[0023] Both the first mean filter and the second mean filter are connected to the shaping module;

[0024] The initial state of the second switch is to be connected to the shaping module;

[0025] The initial state of the third switch is to be connected to the shaping module.

[0026] In an exemplary embodiment of the present disclosure, the shaping module includes: a first shaping unit and a second shaping unit;

[0027] The first shaping unit is respectively connected to the first moving end of the second switch, the first mean filter, and the counting module;

[0028] The first shaping unit is respectively connected to the first moving end of the third switch, the second mean filter, and the counting module.

[0029] In an exemplary embodiment of the present disclosure, an engine speed testing device further includes: a mean module;

[0030] The mean module includes: a fourth switch and a mean unit;

[0031] The fourth switch is a single-pole double-throw switch;

[0032] The fixed end of the fourth switch is connected to the counting module, the first moving end is connected to the central control module, and the second moving end is connected to the mean unit;

[0033] The mean value unit is connected to the counting module and the central control module;

[0034] The initial state of the fourth switch is connected to the central control module.

[0035] In an exemplary embodiment of the present disclosure, the counting module includes: a first counter, a second counter, and a first comparator;

[0036] The first counter is respectively connected to the first comparator, the fixed end of the fourth switch, the first shaping unit, and the timing module;

[0037] The second counter is respectively connected to the second shaping unit, the timing module, and the mean value unit;

[0038] The first comparator is respectively connected to the control end of the first switch and the control end of the fourth switch.

[0039] In an exemplary embodiment of the present disclosure, an engine speed testing device further includes: a temperature compensation module;

[0040] The temperature compensation module is connected to the central control module;

[0041] The temperature compensation module is configured to send a temperature compensation value to the central control module.

[0042] In an exemplary embodiment of the present disclosure, an engine speed testing device further includes: a storage module;

[0043] The storage module is connected to the central control module;

[0044] The storage module is configured to store the data sent by the central control module.

[0045] The beneficial effects of an engine speed testing device provided by an embodiment of the present disclosure are as follows:

[0046] Through the first induction coil and the second induction coil, the present disclosure can accurately capture the high pulse signal generated when the engine rotates. This non-contact measurement method reduces mechanical wear and interference, and improves the accuracy of engine speed measurement; through the filtering module, the present disclosure effectively removes the noise and interference in the signal, such as electromagnetic interference, mechanical vibration, etc., which is convenient for subsequent signal processing and analysis; through the shaping module, the present disclosure shapes the signal, adjusts the possible distorted signal into a regular waveform, which is convenient for the counting module to accurately count, and improves the reliability and accuracy of engine speed testing; improves the reliability and accuracy of engine speed testing. Description of the Drawings

[0047] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the accompanying drawings required for use in the embodiments or the description of the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0048] Figure 1 is a schematic structural diagram of an engine speed test device provided by an embodiment of the present disclosure;

[0049] Figure 2 is a schematic structural diagram of a second engine speed test device provided by an embodiment of the present disclosure. Specific Embodiments

[0050] To enable those skilled in the art to better understand this solution, the following will clearly describe the technical solutions in the embodiments of this solution with reference to the accompanying drawings in the embodiments of this solution. Obviously, the described embodiments are some, but not all, of the embodiments of this solution. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this solution.

[0051] The term "including" in the specification, claims, and the above accompanying drawings of this solution, as well as any other variations, means "including but not limited to", intending to cover non-exclusive inclusion and not limited to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0052] The following will describe the implementation of the present disclosure in detail with reference to specific accompanying drawings:

[0053] Figure 1 is a schematic structural diagram of an engine speed test device provided by an embodiment of the present disclosure. Refer to Figure 1 , the engine speed test device includes: a first induction coil 10, a second induction coil 11, a first switch 12, an amplification module 13, a filtering module 14, a shaping module 15, a counting module 16, a timing module 17, a central control module 18, an engine parameter selection module 19, and a display module 20;

[0054] The amplification module 13 is respectively connected to the first induction coil 10, the second end of the first switch 12, and the filtering module 14;

[0055] The second induction coil 11 is connected to the first end of the first switch 12;

[0056] The shaping module 15 is respectively connected to the filtering module 14 and the counting module 16;

[0057] The counting module 16 is respectively connected to the control ends of the timing module 17, the central control module 18, and the first switch 12;

[0058] The central control module 18 is respectively connected to the engine parameter selection module 19 and the display module 20;

[0059] The first switch 12 is a single-pole single-throw switch;

[0060] The first switch 12 is a normally open switch.

[0061] In this embodiment, the engine can currently be divided into a rotary engine and a piston engine. No matter which type of engine it is, it is necessary to convert low voltage to high voltage for in-cylinder ignition, convert chemical energy into mechanical energy, and drive the engine crankshaft to rotate. Therefore, by detecting the number of high-voltage ignition signals per minute of the engine, the real-time engine speed can be calculated.

[0062] The first induction coil 10 and the second induction coil 11 should be arranged on the high-voltage ignition line part near the spark plug or on the high-voltage ignition line near the engine cylinder block.

[0063] According to the principle of electromagnetic induction, the first induction coil 10 converts the high-voltage ignition signal into an electrical signal. However, since the ignition signal is relatively weak or the distance from the ignition part is relatively far, this electrical signal may be relatively weak. Therefore, the first induction coil 10 combines this electrical signal and sends it to the amplification module 13. The amplification module 13 amplifies it. However, due to environmental factors such as engine vibration or electromagnetic interference, the amplified waveform may contain more interference. The filtering module 14 can filter out the above-mentioned environmental interference and send the filtered waveform signal to the shaping module 15. The shaping module 15 can adjust the existing distorted signal into a regular waveform for the counting module 16 to accurately count. The counting module 16 can count the rising edge of the shaped waveform. When the time preset by the timing module 17 is reached, the counting module 16 sends the counting result to the central control module 18. The counting result is the number of engine ignitions within the preset time. The central control module 18 obtains the engine speed value based on the engine parameter information sent by the engine parameter selection module 19 and the counting result, and displays it on the display module 20. The engine parameter selection module 19 is configured to receive the parameter information of the engine and send it to the central control module 18. The parameter information includes: the number of cylinders and the number of strokes of the engine. For a two-stroke engine, the engine speed is equal to the number of ignitions ÷ the number of cylinders; for a four-stroke engine, the engine speed is equal to the number of ignitions × 2 ÷ the number of cylinders.

[0064] During this process, since the first switch 12 is a normally closed switch, the electrical signal induced by the second induction coil 11 will not be sent to the amplification module 13.

[0065] When the number of ignition times detected by the counter module is higher than the first ignition threshold, the first switch 12 is controlled to close. At this time, the electrical signal induced by the second induction coil 11 will be sent to the amplification module 13. Similarly, the above processing process is carried out, and finally the central control module 18 sends the calculation result to the display module 20.

[0066] For example, the first induction coil 10 senses the high-voltage ignition signal of the engine and sends it to the amplification module 13 for amplification processing. The amplification module 13 sends the amplified signal to the filtering module 14 for filtering processing. The filtering module 14 sends the filtered signal to the shaping module 15. The shaping module 15 shapes the filtered signal and sends the shaped signal to the counting module 16. The counting module 16 counts the rising edge of the signal. The time preset by the timing module 17 is 1 minute. When the time reaches 1 minute, the counting module 16 sends the recorded value to the central control module 18. Specifically, the number of ignition times within 1 minute sent by the counting module 16 is 7000 times, and the engine parameters sent by the engine parameter selection module 19 are: the number of engine cylinders is 1, and the number of strokes is 2. At this time, the central control module 18 performs a simple calculation on it and obtains the engine speed of 7000 revolutions per minute.

[0067] Or, for example, the first ignition threshold is 8000 times. When the number of engine ignition times detected by the counting module 16 within 1 minute is 8500 times, at this time, since the number of engine ignition times is relatively large, the electrical signal induced by the first induction coil 10 may not be accurate enough. Therefore, the first switch 12 is controlled to close. At this time, the second induction coil 11 simultaneously senses the engine ignition signal. The second induction coil 11 converts the sensed ignition signal into an electrical signal and processes it according to the above process. The central control module 18 calculates the average value of the two to obtain the engine speed value.

[0068] It can be concluded from the above that the present disclosure can accurately capture the high-pulse signal generated during the rotation of the engine through the first induction coil 10 and the second induction coil 11. This non-contact measurement method reduces mechanical wear and interference and improves the accuracy of engine speed measurement. The present disclosure effectively removes noise and interference in the signal, such as electromagnetic interference and mechanical vibration, through the filtering module 14, which is convenient for subsequent signal processing and analysis. The present disclosure shapes the signal through the shaping module 15, adjusts the possibly distorted signal into a regular waveform, which is convenient for the counting module 16 to accurately count, and improves the reliability and accuracy of the engine speed test; improves the reliability and accuracy of the engine speed test.

[0069] In an embodiment of the present disclosure, the amplification module 13 includes: a first operational amplifier 131 and a second operational amplifier 132;

[0070] The first operational amplifier 131 is respectively connected to the first induction coil 10 and the filtering module 14;

[0071] The second operational amplifier 132 is respectively connected to the second end of the first switch 12 and the filtering module 14.

[0072] In an embodiment of the present disclosure, an engine speed testing device further includes: a magnetic field sensor module 21;

[0073] The magnetic field sensor module 21 is connected to the filtering module 14;

[0074] The filtering module 14 includes: a first high-pass filter 141, a second high-pass filter 142, a second switch 143, a third switch 144, a first mean filter 145 and a second mean filter 146;

[0075] Both the second switch 143 and the third switch 144 are single-pole double-throw switches;

[0076] The fixed end of the second switch 143 is connected to the first high-pass filter 141, the first moving end is connected to the shaping module 15, the second moving end is connected to the first mean filter 145, and the control end is connected to the magnetic field sensor module 21;

[0077] The fixed end of the third switch 144 is connected to the second high-pass filter 142, the first moving end is connected to the shaping module 15, the second moving end is connected to the second mean filter 146, and the control end is connected to the magnetic field sensor module 21;

[0078] Both the first mean filter 145 and the second mean filter 146 are connected to the shaping module 15;

[0079] The initial state of the second switch 143 is connected to the shaping module 15;

[0080] The initial state of the third switch 144 is connected to the shaping module 15.

[0081] In an embodiment of the present disclosure, the shaping module 15 includes: a first shaping unit 151 and a second shaping unit 152;

[0082] The first shaping unit 151 is respectively connected to the first moving end of the second switch 143, the first mean filter 145 and the counting module 16;

[0083] The first shaping unit 151 is respectively connected to the first moving end of the third switch 144, the second mean filter 146, and the counting module 16.

[0084] In an embodiment of the present disclosure, an engine speed testing device further includes: a mean value module 22;

[0085] The mean value module 22 includes: a fourth switch 221 and a mean value unit 222;

[0086] The fourth switch 221 is a single-pole double-throw switch;

[0087] The fixed end of the fourth switch 221 is connected to the counting module 16, the first moving end is connected to the central control module 18, and the second moving end is connected to the mean value unit 222;

[0088] The mean value unit 222 is connected to the counting module 16 and the central control module 18;

[0089] The initial state of the fourth switch 221 is connected to the central control module 18.

[0090] In an exemplary embodiment of the present disclosure, the counting module 16 includes: a first counter 161, a second counter 162, and a first comparator 163;

[0091] The first counter 161 is respectively connected to the first comparator 163, the fixed end of the fourth switch 221, the first shaping unit 151, and the timing module 17;

[0092] The second counter 162 is respectively connected to the second shaping unit 152, the timing module 17, and the mean value unit 222;

[0093] The first comparator 163 is respectively connected to the control end of the first switch 12 and the control end of the fourth switch 221.

[0094] In this embodiment, the amplification module 13 includes two operational amplifiers, namely a first operational amplifier 131 and a second operational amplifier 132. The first operational amplifier 131 is configured to amplify the electrical signal sent by the first induction coil 10 and send the amplified electrical signal to the first high-pass filter 141; the second operational amplifier 132 is configured to amplify the electrical signal sent by the second induction coil 11 and send the amplified electrical signal to the second high-pass filter 142.

[0095] The magnetic field sensor module 21 is configured to detect the surrounding magnetic field intensity and control the connection states of the second switch 143 and the third switch 144. When the magnetic field sensor module 21 senses that the surrounding magnetic field intensity exceeds the first magnetic field threshold, it controls the second switch 143 and the third switch 144 to connect to the second moving end to perform mean filtering to eliminate the influence of the magnetic field on the detection result.

[0096] The first shaping unit 151 is configured to shape the filtered signal and send it to the first counter 161. The second shaping unit 152 is configured to shape the filtered signal and send it to the second counter 162.

[0097] The first counter 161 sends the counting result within a preset time to the first comparator 163. The first comparator 163 compares this counting result with a preset reference threshold. If it is greater than the preset reference threshold, the first comparator 163 controls the first switch 12 to close and controls the fourth switch 221 to connect to the second moving end.

[0098] For example, the reference threshold preset by the first comparator 163 is 8000 times. The first induction coil 10 senses the high-voltage ignition signal of the engine and sends it to the first operational amplifier 131 for amplification processing. The first operational amplifier 131 sends the amplified signal to the first high-pass filter 141 for filtering processing. The first high-pass filter 141 sends the filtered signal to the first shaping unit 151. The first shaping unit 151 shapes the filtered signal and sends the shaped signal to the first counter 161. The first counter 161 counts the rising edges of the signal. The preset time of the timing module 17 is 1 minute. When the time reaches 1 minute, the counting module 16 sends the recorded value to the central control module 18. Specifically, the number of ignition times within 1 minute sent by the counting module 16 is 7000 times, and the engine parameters sent by the engine parameter selection module 19 are: the number of engine cylinders is 2, and the number of strokes is 4. At this time, the central control module 18 performs a simple calculation on it to obtain the engine speed of 7000 revolutions per minute.

[0099] After a period of time, the number of ignition times detected by the first counter 161 is 9000 times, exceeding the preset 8000 times. Therefore, the first comparator 163 controls the first switch 12 to close and controls the fourth switch 221 to connect to the second moving end. At this time, the second induction coil 11 senses the high-voltage ignition signal of the engine and sends it to the second operational amplifier 132 for amplification processing. The second operational amplifier 132 sends the amplified signal to the second high-pass filter 142 for filtering processing. The second high-pass filter 142 sends the filtered signal to the second shaping unit 152. The second shaping unit 152 shapes the filtered signal and sends the shaped signal to the second counter 162. The second counter 162 counts the rising edges of the signal and sends it to the mean unit 201. The mean unit 201 takes the mean of the counting results sent by the first counter 161 and the second counter 162 and sends this mean to the central control module 18. After simple calculation, the central control module 18 sends it to the display module 20. Specifically, the counting result sent by the first counter 161 is 9100 times, the counting result sent by the second counter 162 is 9200 times, the mean is 9150 times. The mean module 22 sends this value to the central control module 18. The central control module 18 performs simple calculation to obtain the engine speed of 9150 revolutions per minute and sends it to the display module 20 to display the current speed value.

[0100] Alternatively, for example, during this process, when the magnetic field sensor module 21 detects that the magnetic field intensity is greater than the preset magnetic field threshold, the magnetic field sensor module 21 controls the second switch 143 and the third switch 144 to connect to the second moving end. At this time, the signal filtered by the first high-pass filter 141 will be filtered again by the first mean filter 145 to eliminate the external magnetic field influence, and the signal filtered by the second high-pass filter 142 will be filtered again by the second mean filter 146 to eliminate the external magnetic field influence.

[0101] It can be concluded from the above that the present disclosure improves the independence of the signals by introducing the first operational amplifier 131 and the second operational amplifier 132 to process the signals from the first induction coil 10 and the second induction coil 11 respectively, so as to avoid signal cross-interference. This dual-channel amplification design ensures that signals from different sources can be fully amplified, thereby improving the signal-to-noise ratio and the accuracy of subsequent processing. The present disclosure effectively reduces the magnetic field interference and fluctuations in the signals through the first mean filter 145 and the second mean filter 146, improving the stability and reliability of the signals. The present disclosure calculates the mean of the counting results through the mean module 22 to obtain a more accurate number of ignition times, improving the reliability and accuracy of the device.

[0102] In one embodiment of the present disclosure, an engine speed testing device further includes: a temperature compensation module 23;

[0103] The temperature compensation module 23 is connected to the central control module 18;

[0104] The temperature compensation module 23 is configured to send a temperature compensation value to the central control module 18.

[0105] In one embodiment of the present disclosure, an engine speed testing device further includes: a storage module 24;

[0106] The storage module 24 is connected to the central control module 18;

[0107] The storage module 24 is configured to store the data sent by the central control module 18.

[0108] In this embodiment, the temperature compensation module 23 is further configured to detect the surrounding temperature in real time and compensate the detection result according to the temperature value.

[0109] In an extreme temperature environment, the temperature will cause certain errors in the testing of the engine speed. The temperature compensation module 23 can correct the detection result according to the real-time temperature information to reduce the error and improve the accuracy of the detection. The storage module 24 can record and store the values calculated by the central control module 18 for subsequent search and query.

[0110] It can be concluded from the above that through the temperature compensation module 23 of the present disclosure, the engine speed testing device can better adapt to the testing requirements in different temperature environments. Whether in a hot environment or a cold environment, it can maintain a high testing accuracy, enhance the environmental adaptability and application range of the device, and improve the accuracy and reliability of the engine speed testing; through the storage module 24 of the present disclosure, the engine speed data is stored, which is convenient for subsequent data analysis, fault troubleshooting and performance evaluation, and improves the reliability and comprehensiveness of the device.

[0111] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. An engine speed testing device, characterized in that, Comprising: A first induction coil, a second induction coil, a first switch, an amplification module, a filtering module, a shaping module, a counting module, a timing module, a central control module, an engine parameter selection module, and a display module; The amplification module is respectively connected to the first induction coil, the second end of the first switch, and the filtering module; The second induction coil is connected to the first end of the first switch; The shaping module is respectively connected to the filtering module and the counting module; The counting module is respectively connected to the timing module, the central control module, and the control end of the first switch; The central control module is respectively connected to the engine parameter selection module and the display module; The first switch is a single-pole single-throw switch; The first switch is a normally open switch.

2. The engine speed testing device according to claim 1, characterized in that, The amplification module includes: a first operational amplifier and a second operational amplifier; The first operational amplifier is respectively connected to the first induction coil and the filtering module; The second operational amplifier is respectively connected to the second end of the first switch and the filtering module.

3. The engine speed testing device according to claim 2, characterized in that, Further comprising: A magnetic field sensor module; The magnetic field sensor module is connected to the filtering module; The filtering module includes: a first high-pass filter, a second high-pass filter, a second switch, a third switch, a first mean filter, and a second mean filter; Both the second switch and the third switch are single-pole double-throw switches; The fixed end of the second switch is connected to the first high-pass filter, the first moving end is connected to the shaping module, the second moving end is connected to the first mean filter, and the control end is connected to the magnetic field sensor module; The fixed end of the third switch is connected to the second high-pass filter, the first moving end is connected to the shaping module, the second moving end is connected to the second mean filter, and the control end is connected to the magnetic field sensor module; Both the first mean filter and the second mean filter are connected to the shaping module; The initial state of the second switch is to be connected to the shaping module; The initial state of the third switch is to be connected to the shaping module.

4. The engine speed test device according to claim 3, characterized in that, The shaping module includes: a first shaping unit and a second shaping unit; The first shaping unit is respectively connected to the first moving end of the second switch, the first mean filter, and the counting module; The first shaping unit is respectively connected to the first moving end of the third switch, the second mean filter, and the counting module.

5. An engine speed testing device according to claim 4, characterized in that, Further comprising: A mean module; The mean module includes: a fourth switch and a mean unit; The fourth switch is a single-pole double-throw switch; The fixed end of the fourth switch is connected to the counting module, the first moving end is connected to the central control module, and the second moving end is connected to the mean unit; The mean unit is connected to the counting module and the central control module; The initial state of the fourth switch is to be connected to the central control module.

6. The engine speed testing device according to claim 5, characterized in that The counting module includes: a first counter, a second counter, and a first comparator; The first counter is respectively connected to the first comparator, the fixed end of the fourth switch, the first shaping unit, and the timing module; The second counter is respectively connected to the second shaping unit, the timing module, and the mean value unit; The first comparator is respectively connected to the control end of the first switch and the control end of the fourth switch.

7. An engine speed test device according to claim 1, characterized in that, It further includes: A temperature compensation module; The temperature compensation module is connected to the central control module; The temperature compensation module is configured to send a temperature compensation value to the central control module.

8. The engine speed testing device according to claim 1, characterized in that, It further includes: A storage module; The storage module is connected to the central control module; The storage module is configured to store the data sent by the central control module.

Images