Speed sensor testing device

Abstract

The utility model discloses a speed sensor testing device, comprising a transmission control module used for sending a transmission control signal; the transmission module is connected with the transmission control module and is started according to the transmission control signal, and the tested speed sensor detects the transmission module to obtain a frequency signal; the signal acquisition module is connected with the tested speed sensor and is used for acquiring a frequency signal and converting the frequency signal to obtain a display signal; the display module is connected with the signal acquisition module and is used for displaying the display signal; and the power supply module is connected with the transmission module and the signal acquisition unit and used for providing a working power supply. According to the utility model, the transmission control module and the transmission module are arranged, so that the tested speed sensor can detect the transmission module to obtain a frequency signal, meanwhile, the signal acquisition module is adopted to acquire the frequency signal, and finally, the display module is adopted to display the frequency signal, so that the speed sensor can be conveniently tested.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of subway traction / braking system, concretely relates to a speed sensor testing device. BACKGROUND

[0002] Hall speed sensor is widely used in each model traction / braking system of guangzhou subway, the type of speed sensor installed in each model is not unified, these speed sensors not only have the difference between voltage type and current type in output type, the output channel number of different models of speed sensor is also not same, at present, it does not have the ability to detect hall speed sensor separately. Therefore, the sensor cannot be tested periodically, and the hidden trouble cannot be eliminated in advance. In addition, when the speed sensor fails during the operation of the train, it may report a variety of different faults, such as detecting the rear speed, abnormal anti-skid, WSP probe failure, etc. Therefore, after the train is returned to the warehouse, it is often difficult to lock the specific fault reason, and the test is carried out on the test line after replacing the sensor or detecting the board card and other components, so the fault troubleshooting efficiency is low, and the fault spare parts cannot be quickly locked. CONTENT OF THE UTILITY MODEL

[0003] In order to overcome the above technical defects, the utility model provides a kind of speed sensor testing device structure, which can quickly and conveniently realize the test of speed sensor.

[0004] In order to solve the above problems, the utility model is realized according to the following technical scheme:

[0005] A kind of speed sensor testing device, comprising:

[0006] Transmission control module, for sending transmission control signal;

[0007] Transmission module, connected with the transmission control module, for starting according to the transmission control signal, and the frequency signal is obtained by the tested speed sensor detecting the transmission module;

[0008] Signal acquisition module, connected with the tested speed sensor, for collecting the frequency signal, and converting the frequency signal to obtain display signal;

[0009] Display module, connected with the signal acquisition module, for displaying the display signal;

[0010] Power module, connected with the transmission module and the signal acquisition unit, for providing working power supply.

[0011] As a further improvement of the utility model, the transmission module comprises: brushless motor, shaft coupling, transmission shaft and gear connected in sequence.

[0012] The gear is driven to rotate by the brushless motor, and a tested speed sensor acquires speed information of the gear.

[0013] As a further improvement of the utility model, the transmission control module comprises: a forward and reverse control unit, a rotating speed mode control unit, a fixed rotating speed mode control unit and a stepless speed regulation mode control unit.

[0014] The power supply interface of the brushless motor is connected to the power supply module, and the control interface of the brushless motor is connected to the forward and reverse control unit through the rotating speed mode control unit;

[0015] The control interface of the brushless motor is connected to the fixed rotating speed mode control unit and the stepless speed regulation mode control unit through the rotating speed mode control unit.

[0016] The power supply module is connected to the forward and reverse control unit, the rotating speed mode control unit, the fixed rotating speed mode control unit and the stepless speed regulation mode control unit.

[0017] As a further improvement of the utility model, the signal acquisition module comprises: a signal processing unit and at least one switch control unit.

[0018] The tested speed sensor is connected to the signal processing unit through the switch control unit.

[0019] As a further improvement of the utility model, the signal acquisition module further comprises: at least one load unit.

[0020] The tested speed sensor is connected to the signal processing unit through the load unit.

[0021] As a further improvement of the utility model, the switch control unit comprises: a toggle switch.

[0022] The tested speed sensor is connected to the signal processing unit through the toggle switch.

[0023] As a further improvement of the utility model, the load unit comprises: a load control switch and a load resistor.

[0024] One end of the load resistor is connected to the load control switch, and the other end is connected to the tested speed sensor.

[0025] The tested speed sensor is connected to the signal processing unit through the load control switch.

[0026] As a further improvement of the utility model, the power supply module comprises: a first battery pack, a second battery pack, a battery pack power supply, a power supply control switch and an electric quantity display table.

[0027] The battery power supply is connected with the first battery pack, the second battery pack and the power control switch respectively,

[0028] The first battery pack is connected with the transmission module and the electric quantity display table.

[0029] The second battery pack is connected with the signal acquisition module and the electric quantity display table.

[0030] As a further improvement of the utility model, the power module is connected with the transmission module through the first power conversion module.

[0031] As a further improvement of the utility model, the power module is connected with the signal acquisition module through the second power conversion module.

[0032] Compared with the prior art, the utility model has the advantages that the transmission control module and the transmission module are arranged, the tested speed sensor can detect the transmission module to obtain the frequency signal, the signal acquisition module is used to acquire the frequency signal, and finally the display module is used to display, so that the test of the speed sensor can be conveniently realized. BRIEF DESCRIPTION OF DRAWINGS

[0033] The specific embodiments of the utility model will be further explained in detail below in combination with the drawings, wherein:

[0034] Figure 1 It is the overall structure schematic view of the speed sensor testing device of the utility model;

[0035] Figure 2 It is the structure schematic view of the transmission module of the utility model;

[0036] Figure 3 It is the structure schematic view of the transmission control module of the utility model;

[0037] Figure 4 It is the structure schematic view of the signal acquisition module of the utility model;

[0038] Figure 5 It is the equivalent circuit of the use process of the utility model Figure 1 ;

[0039] Figure 6 It is the equivalent circuit of the use process of the utility model Figure 2 ;

[0040] Figure 7 It is the equivalent circuit of the use process of the utility model Figure 3 ;

[0041] Figure 8The utility model discloses a structure schematic diagram of industrial computer all -in -one.

[0042] Figure 9 The utility model discloses the appearance drawing of speed sensor testing device.

[0043] Mark explanation: 1, drive control module;11, forward and reverse control unit;12, rotating speed mode control unit;13, fixed rotating speed mode control unit;14, stepless speed regulation mode control unit;2, drive module;21, brushless motor;22, shaft coupling;23, transmission shaft;24, gear;3, signal acquisition module;31, signal processing unit;32, switch control unit;33, load unit;4, display module;41, industrial computer all -in -one;42, ammeter;5, power module;51, first battery pack;52, second battery pack;53, battery pack power;54, power control switch;55, electric quantity display meter;56, first power conversion module;57, second power conversion module;6, standard electric connector;7, aluminum alloy shell;8, handle;100, the speed sensor of being tested. DETAILED DESCRIPTION

[0044] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described here are only for explaining and illustrating the utility model, and are not for limiting the utility model.

[0045] The utility model provides a kind of speed sensor testing device, as Figure 1 As shown, including: drive control module 1, drive module 2, signal acquisition module 3, display module 4 and power module 5, wherein, drive control module 1 is used to send drive control signal;Drive module 2 is connected with drive control module 1, is used to start according to drive control signal, and the frequency signal is obtained by being tested speed sensor to drive module 2 detection;Signal acquisition module 3 is connected with the speed sensor of being tested, is used to collect frequency signal, and conversion is obtained display signal to frequency signal;Display module 4 is connected with signal acquisition module 3, is used to display display signal;Power module 5 is connected with drive module 2, signal acquisition unit, is used to provide working power supply.

[0046] As shown in Figure 2 Drive module 2 includes: brushless motor 21, shaft coupling 22, transmission shaft 23, gear 24 connected in sequence;Gear 24 is driven to rotate by brushless motor 21, and the speed information of gear 24 is obtained by the speed sensor of being tested.

[0047] The power source of the transmission module 2 is a brushless motor 21, which synchronously drives the target gear 24 to rotate. A clamp is arranged on the target gear 24. The probe of the tested speed sensor is fixed to the clamp to detect the target gear 24 and output corresponding frequency signals. The clamp is adapted according to different types of probes. In order to facilitate use, a standard electrical connector 6 is arranged on the speed sensor testing device, which facilitates quick connection with the tested speed sensor.

[0048] As shown in Figure 3 The transmission control module 1 includes a forward and reverse control unit 11, a rotating speed mode control unit 12, a fixed rotating speed mode control unit 13, and a stepless speed regulation mode control unit 14. The power supply interface of the brushless motor 21 is connected to the power supply module 5, and the control interface of the brushless motor 21 is connected to the forward and reverse control unit 11. The control interface of the brushless motor 21 is connected to the fixed rotating speed mode control unit 13 and the stepless speed regulation mode control unit 14 through the rotating speed mode control unit 12. The power supply module 5 is connected to the forward and reverse control unit 11, the rotating speed mode control unit 12, the fixed rotating speed mode control unit 13, and the stepless speed regulation mode control unit 14.

[0049] Specifically, the forward and reverse control unit 11 is implemented by a switch SW-Dir, the rotating speed mode control unit 12 is implemented by a switch SW-Spd, the fixed rotating speed mode control unit 13 includes resistors R31, R32, R41, R42, a switch SW31, resistors R33, R34, R43, and a switch SW32, and the stepless speed regulation mode control unit 14 includes an adjustable potentiometer Motor RP and a power supply chip POL. In the specific implementation process, since the brushless motor 21 has only one SPD interface, an interface U2 is arranged to connect the stepless speed regulation mode control unit 14 and the fixed rotating speed mode control unit 13 to the SPD interface of the brushless motor 21. The interface U2 is a three-way interface. An interface U1 is used to connect each unit to the positive and negative poles of the power supply circuit. The interface U1 is a wiring harness for the positive and negative poles of the power supply.

[0050] The brushless motor 21 itself has a steering adjustment function. The FR port of the brushless motor 21 is suspended, that is, counterclockwise rotation, and grounded, that is, clockwise rotation. The FR port of the brushless motor 21 is connected to the ground line through the switch SW-Dir to control the grounding state of the FR port of the brushless motor 21, thereby realizing the forward and reverse rotation of the motor. The SPD and GND interfaces of the brushless motor 21 are connected with the adjustable potentiometer Motor RP, so that the voltage output to the SPD port of the speed regulation circuit can be continuously changed. At the same time, the power supply chip POL outputs a 5V reference voltage to the 5V port of the brushless motor 21. According to the voltage difference between the SPD port and the 5V port, the brushless motor 21 outputs different rotating speeds, thereby realizing stepless speed regulation of the brushless motor 21. In the low-speed and medium-speed fixed-speed mode, the input voltage of the SPD port of the brushless motor 21 at the required fixed speed needs to be calculated. Under the premise of isolating the stepless speed regulation circuit, appropriate resistors are connected in series to the control circuit of the brushless motor 21. The on-off of the stepless speed regulation circuit and the constant speed load circuit is controlled through the switch SW-Spd. The pull-up is the fixed-speed mode, and the pull-down is the stepless speed regulation mode. In the constant speed load circuit, the switch SW31 controls the on-off of the corresponding external resistor. When the resistor is connected to the circuit, it plays a role in voltage division, so that the input voltage of the SPD port is a constant, thereby realizing the rotation of the brushless motor 21 at a fixed speed.

[0051] Through the stepless speed regulation of the brushless motor 21 by the adjustable potentiometer, the change of the output signal of the "tested speed sensor" can be directly observed when the rotating speed of the gear 24 is tested. Through the low-speed and medium-speed fixed-speed mode, the output frequency error of the "tested speed sensor" can be compared and detected.

[0052] The signal acquisition module 3 provided by the utility model can be applicable to a composite speed sensor, a voltage type speed sensor and a current type speed sensor.

[0053] As shown in Figure 4 The signal acquisition module 3 comprises a signal processing unit 31 and at least one switch control unit 32. The tested speed sensor is connected to the signal processing unit 31 through the switch control unit 32. The switch control unit 32 comprises a toggle switch. The tested speed sensor is connected to the signal processing unit 31 through the toggle switch. Alternatively, the switch control unit 32 comprises a toggle switch and a load resistor. One end of the load resistor is connected to the toggle switch, and the other end of the load resistor is connected to the tested speed sensor. The tested speed sensor is connected to the signal processing unit 31 through the toggle switch.

[0054] Further, the signal acquisition module 3 further comprises at least one load unit 33. The tested speed sensor is connected to the signal processing unit 31 through the load unit 33.

[0055] The load unit 33 comprises a load control switch and a load resistor; one end of the load resistor is connected to the load control switch, and the other end is connected to the speed sensor under test; the speed sensor under test is connected to the signal processing unit 31 through the load control switch.

[0056] The signal acquisition module 3 uses a standard connector to connect the signal of the speed sensor under test to the signal acquisition module 3, and the signal acquisition module 3 collects different signals at high speed, according to different sensor types, the load unit 33 provides different modes of analog load for correct signal acquisition, and the signal processing unit 31 processes the collected signals, draws corresponding waveforms according to signal data, and measures various parameters.

[0057] When applied to a composite speed sensor, the composite speed sensor S1 signal is transmitted to the FS1 interface of the toggle switch DSO-SW1 through the FS1 interface of the sensor interface MQV-PCB-1, when the toggle switch DSO-SW1 is in the pull-up state, the FS1 interface and the CH1 interface are conductive, the S1 signal can be transmitted to the CH1 interface of the signal processing unit 3131 interface DSO-S, and the S1 signal is collected; the composite speed sensor S2 signal is transmitted to the FS2 interface of the toggle switch DSO-SW2 through the FS2 interface of the sensor interface MQV-PCB-1, when the toggle switch DSO-SW2 is in the pull-up state, the FS2 interface and the CH2 interface are conductive, the S2 signal can be transmitted to the CH2 interface of the signal processing unit 3131 interface DSO-S, and the S2 signal is collected; the composite speed sensor S3, S4 signals are directly connected to the CH3, CH4 interfaces of the signal processing unit 3131 interface DSO-S from the FS3, FS4 interfaces of the sensor interface MQV-PCB-2, and the S3, S4 signals are collected.

[0058] The one end of the load resistance DFS1 is connected to the compound speed sensor power supply negative pole V21- interface, and the other end is connected to the D1 interface of the toggle switch MQV-SW1. When the toggle switch MQV-SW1 is in the pull-up state, the D1 interface and the FS1 interface thereof are conductive, the FS1 interface is directly connected to the S1 signal transmission loop, the parallel connection of the load resistance DFS1 and the S1 signal loop is realized, and the S1 signal is converted to the load state at this time. The one end of the load resistance DFS2 is connected to the compound speed sensor power supply negative pole V21- interface, and the other end is connected to the D2 interface of the toggle switch MQV-SW1. When the toggle switch MQV-SW1 is in the pull-up state, the D2 interface and the FS2 interface thereof are conductive, the FS2 interface is directly connected to the S2 signal transmission loop, the parallel connection of the load resistance DFS2 and the S2 signal loop is realized, and the S2 signal is converted to the load state at this time. The connection principles of the load resistance DFS3 and the load resistance DFS4 are the same as those of the load resistance DFS1 and the load resistance DFS2. When the toggle switch MQV-SW2 is in the pull-up state, the load resistance DFS3 and the load resistance DFS4 are connected to the S3 and S4 signal loops, and the S3 and S4 signals are converted to the load state. Conversely, when the toggle switch MQV-SW1 and the toggle switch MQV-SW2 are in the pull-down state, the four load resistances are disconnected from the signal loops, and the four signals are in the idle state. The equivalent principle diagram is shown in Figure 5 .

[0059] When applied to a voltage type speed sensor, the voltage type speed sensor S1 signal is transmitted from the MS1 interface of the sensor interface MS / DV-PCB to the MS1 interface of the toggle switch DSO-SW1. When the toggle switch DSO-SW1 is in the pull-down state, the MS1 interface and the CH1 interface thereof are conductive, the S1 signal is transmitted from the CH1 interface of the toggle switch DSO-SW1 to the CH1 interface of the signal processing unit 31 interface DSO-S, and the S1 signal is collected. The S2 signal is transmitted from the MS2 interface of the sensor interface MDV-PCB to the MS2 interface of the toggle switch DSO-SW2. When the toggle switch DSO-SW2 is in the pull-down state, the MS2 interface and the CH2 interface thereof are conductive, the S2 signal is transmitted from the CH2 interface of the toggle switch DSO-SW2 to the CH2 interface of the signal processing unit 31 interface DSO-S, and the S2 signal is collected.

[0060] The load resistor DMS1 is connected to the voltage and current speed sensor power supply V1- interface at one end and to the D1 interface of the toggle switch MDV-SW at the other end. The load resistor DMS2 is connected to the voltage and current speed sensor power supply V1- interface at one end and to the D2 interface of the toggle switch MDV-SW at the other end. When the toggle switch MDV-SW is in the pull-down state, the D1 interface and the MS2 interface of the toggle switch MDV-SW are conductive, and the D2 interface and the MS1 interface of the toggle switch MDV-SW are conductive. At this time, the two load resistors are connected in parallel to the voltage type speed sensor S1 and S2 signal loop through the MS1 and MS2 interfaces of the toggle switch MDV-SW, and the voltage type speed sensor S1 and S2 signal is in a load state at this time. When the toggle switch MDV-SW is in the pull-up state, the D1 and D2 interfaces of the two loads are suspended. At this time, the voltage type speed sensor S1 and S2 signal is in an unloaded state, and the equivalent circuit diagram is shown in Figure 6 .

[0061] When applied to a current type speed sensor, the 15V power supply voltage of the current type speed sensor is input through the 15VDC V1+ and V1- interfaces. The positive electrode of the power supply is connected to the V1+ interface of the toggle switch V / C-SW, and the negative electrode of the power supply is connected to the V1- interface of the toggle switch V / C-SW. When the toggle switch V / C-SW is in the pull-up state, the V1+ interface and the No. 6 MC interface are conductive, and the V1- interface and the No. 3 MC interface are conductive. The No. 6 MC interface and the No. 3 MC interface are connected to the V1+ and V1- of the sensor interface MSC-PCB, respectively. At this time, the 15V power supply voltage is connected to the current type speed sensor to make it work, and the CH1 interface of the DSO-S interface of the signal processing unit 31 is connected to the power supply circuit V1- of the current type speed sensor to collect the speed signal of the current type speed sensor. The load resistor of the current type speed sensor is connected in series in the signal channel, and there is no distinction between no-load and load test. The equivalent circuit is shown in Figure 7 . The signal processing unit 31 receives the speed sensor voltage signal through the load circuit, processes the voltage signal output by the speed sensor through the internal circuit, and outputs it to the industrial personal computer 41 of the display module 4. The signal processing unit 31 includes four high-impedance non-rim probes, each of which is composed of a signal pin, a ground pin and a compensator. The four signal pins are connected to the CH1-CH4 of the DSO-S interface of the signal processing unit 31 for receiving the signal output by the speed sensor; the four ground pins are connected to the GND1-GND4 of the DSO-GND interface for eliminating environmental interference; the compensator can offset the capacitance and inductance generated in the signal transmission line to reduce the measurement error, and J61-J64 are the channels of the display module 4.

[0062] The display module 4 comprises an industrial computer 41 and an ammeter 42. The complete waveform and related parameters are displayed through the industrial computer 41, and the control of the signal unit can be realized through the screen touch of the industrial computer 41. Meanwhile, the current of the power supply channel is detected by the ammeter 42. Through the display screen and the ammeter 42, the performance parameters of the current speed sensor under test can be completely exhibited.

[0063] Preferably, the industrial computer 41 can be realized by a touch-controllable LCD screen industrial computer 41 STO1004. The complete waveform and related parameters are displayed through the oscilloscope host computer software configured inside, and the control of the signal unit can be realized through the screen touch. Through the display screen, the performance parameters of the current speed sensor signal waveform under test can be completely exhibited. The schematic diagram of the industrial computer 41 is shown in Figure 8 . The specific technology is described in the prior art, which will not be repeated here.

[0064] The power module 5 comprises a first battery pack 51, a second battery pack 52, a battery pack power supply 53, a power control switch 54 and an electric quantity display meter 55. The battery pack power supply 53 is connected with the first battery pack 51, the second battery pack 52 and the power control switch 54 respectively. The first battery pack 51 is connected with the transmission module 2 and the electric quantity display meter 55. The second battery pack 52 is connected with the signal acquisition module 3 and the electric quantity display meter 55. The first battery pack 51 and the second battery pack 52 can be realized by lithium batteries. The battery pack power supply 53 can be a commercial power supply. An external power adapter is used to charge the lithium batteries.

[0065] The power module 5 is connected with the transmission module 2 through a first power conversion module 56. The first power conversion module 56 converts the alternating current into direct current and then performs voltage reduction processing to obtain the voltage meeting the use of the transmission module 2.

[0066] The power module 5 is connected with the signal acquisition module 3 through a second power conversion module 57. The second power conversion module 57 converts the alternating current into direct current and then performs voltage reduction processing to obtain the voltage meeting the use of the signal acquisition module 3.

[0067] In order to facilitate carrying, all the modules in the speed sensor testing device are placed in an aluminum alloy shell 7. Handles 8 are arranged on both sides of the aluminum alloy shell 7. The upper pull switch, the adjustable potentiometer and various switches are arranged on the panel of the aluminum alloy shell 7. The sensor interface is also located on the aluminum alloy shell 7. The display module is arranged on the top of the aluminum alloy shell 7, as shown in Figure 9 .

[0068] In the specific use process, the tested speed sensor is connected with the tester, the dial switch is pulled up or down according to the sensor type to correspond to the test mode, the tester speed motor speed is started and adjusted through the motor control panel, the tester display screen displays the output signal waveform of the tested speed sensor, and the duty ratio, period, amplitude, frequency, phase difference and other parameters of the waveform are displayed.

[0069] Table 1 test waveform and parameter display

[0070]

[0071]

[0072] In summary, the utility model discloses a general speed sensor testing device of multipurpose test, quick change type and development, can satisfy the offline test of different types of speed sensor product. Speed sensor testing device integrates the speed measuring gear with signal acquisition module and display module, and is provided with built-in power module, and is compact in design and convenient to carry to the train field for testing. Speed sensor testing device can design corresponding signal transmission interface, quick switching power supply and load unit according to different types (voltage type, current type, composite type, single channel, multichannel) of speed sensor, and the measured speed sensor is connected with the corresponding signal transmission interface, and the corresponding power supply and load circuit are selected through the switch, so that the test of multiple types of speed sensors can be realized.

[0073] The tester uses a brushless motor to drive the gear, adjusts the rotation speed of the gear through a rotation speed adjusting knob and changes the direction, simulates the actual working state of the gear box and shaft end, thereby providing a signal source for the measured sensor, and can detect the duty ratio, phase difference and high and low level of the sensor output signal, and judge the performance of the product according to the test data.

[0074] The above is only the preferred embodiment of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A speed sensor testing device, characterized by, The utility model relates to a kind of speed sensor testing device, including: Transmission control module is used to issue transmission control signal; Transmission module is connected with the transmission control module, is used to start according to the transmission control signal, and the frequency signal is obtained by the tested speed sensor to the transmission module; Signal acquisition module is connected with the tested speed sensor, is used to collect the frequency signal, and the display signal is obtained by converting the frequency signal; Display module is connected with the signal acquisition module, is used to display the display signal; Power module is connected with the transmission module, the signal acquisition unit, is used to provide working power supply.

2. The speed sensor testing device of claim 1, wherein, The transmission module includes: brushless motor, shaft coupling, transmission shaft, gear connected in sequence; The gear is driven to rotate by the brushless motor, and the speed information of the gear is acquired by the tested speed sensor.

3. The speed sensor testing device of claim 2, wherein, The transmission control module includes: forward and reverse control unit, rotating speed mode control unit, fixed rotating speed mode control unit and stepless speed regulation mode control unit; The power interface of the brushless motor is connected with the power module, and the control interface of the brushless motor is connected with the forward and reverse control unit; The control interface of the brushless motor is connected with the fixed rotating speed mode control unit and the stepless speed regulation mode control unit through the rotating speed mode control unit; The power module is connected with the forward and reverse control unit, the rotating speed mode control unit, the fixed rotating speed mode control unit and the stepless speed regulation mode control unit.

4. The speed sensor testing device of claim 1, wherein, The signal acquisition module includes: signal processing unit, at least one switch control unit; The tested speed sensor is connected with the signal processing unit through the switch control unit.

5. The speed sensor testing device of claim 4, wherein, The signal acquisition module further includes: at least one load unit; The tested speed sensor is connected with the signal processing unit through the load unit.

6. The speed sensor testing device of claim 4, wherein, The switch control unit includes: toggle switch; The tested speed sensor is connected with the signal processing unit through the toggle switch.

7. The speed sensor testing device of claim 5, wherein, The load unit includes: load control switch and load resistance; One end of the load resistance is connected with the load control switch, and the other end is connected with the tested speed sensor; The tested speed sensor is connected with the signal processing unit through the load control switch.

8. The speed sensor testing device of claim 1, wherein, The power module includes: first battery pack, second battery pack, battery pack power supply, power control switch and power display table; The battery pack power supply is connected with the first battery pack, the second battery pack and the power control switch respectively, The first battery pack is connected with the transmission module and the power display table; The second battery pack is connected with the signal acquisition module and the power display table.

9. The speed sensor testing device of claim 1, wherein, The power module is connected with the transmission module through the first power conversion module.

10. The speed sensor testing device of claim 1, wherein, The power module is connected with the signal acquisition module through the second power conversion module.

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