A locomotive speed sensor test bench
By designing a locomotive speed sensor test bench, using control devices and pulse motors to measure the error of the speed sensor at different speeds, the problem of large errors in the existing technology is solved, and more accurate and reliable test results are achieved.
Patent Information
- Application Number
- CN201811576176.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2018-12-22
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2038-12-22
AI Technical Summary
The existing locomotive speed sensor testing methods have a problem of large errors, especially under different speed conditions, where the errors are inconsistent, resulting in inaccurate test results.
A locomotive speed sensor test bench is designed to control the pulse motor speed through the control device, and the speed sensor tests the motor speed, and measure errors at various different speeds through comparison with the theoretical speed.
It realizes automatic judgment of the error range of the speed sensor, and changes the speed according to requirements to test the test errors at different speeds, improving the accuracy and reliability of the test. Even if the speed sensor being inspected has a circuit failure, it will not cause damage to the equipment.
Smart Images
Figure CN111351964B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of detection tooling, and in particular relates to a locomotive speed sensor test bench. Background Art
[0002] The locomotive speed sensor needs to be tested after being purchased in bulk and installed to avoid the hidden dangers caused by defective products when used on the locomotive. After the locomotive has been running for a certain period of time, the speed sensor also needs to be measured regularly to avoid affecting normal operation. The existing speed sensor is driven by a standard speed and the output signal is measured during testing. However, in actual operation, the speed sensor has inconsistent errors at different speeds, so the test error is large. Summary of the invention
[0003] In view of the shortcomings of the prior art, the present invention provides a locomotive speed sensor test bench. The present invention controls the pulse motor speed through a control device, and the speed sensor tests the motor speed, and measures the measurement errors of various speeds by comparing with the theoretical speed.
[0004] The technical solution of the present invention is: a locomotive speed sensor test bench, including a test bench, a pulse motor, a speed sensor, a control device and a coupling, wherein the pulse motor and the speed sensor are fixed on the test bench, and the pulse motor and the speed sensor are connected through a coupling, and the characteristic is that the control device includes a controller, a pulse output module, and a measuring module, the pulse output module is connected to the pulse motor, the measuring module is connected to the speed sensor, the measuring module includes an AC / DC power supply, a thyristor, a pulse power IGBT, a pulse transformer, a gate resistor, a voltage regulating resistor, and a voltage dividing resistor, the positive pole of the DC output of the AC / DC power supply is respectively connected to the anode of the thyristor and one end of the voltage regulating resistor, and the other end of the voltage regulating resistor is connected to the pulse power I GBT emitter is connected, thyristor cathode is connected to pulse power IGBT gate through gate resistor, thyristor control electrode is connected to speed sensor output signal line, pulse power IGBT collector is connected to DC ground through voltage divider resistor, pulse transformer input end is connected to voltage divider resistor in parallel, and pulse transformer output end is connected to controller pulse acquisition port; pulse output module includes photoelectric coupler, voltage divider resistor and output resistor, anode of photoelectric coupler is connected to controller pulse output end, cathode of photoelectric coupler is connected to DC ground, emitter of photoelectric coupler is connected to output resistor, and emitter is connected to pulse motor control signal line; collector of photoelectric coupler is connected to positive pole of DC power supply after passing through voltage divider resistor.
[0005] According to the locomotive speed sensor test bench as described above, the feature is that the thyristor is a fast thyristor.
[0006] According to the locomotive speed sensor test bench as described above, the feature is that the voltage dividing resistor is 1KΩ, and the voltage regulating range of the voltage regulating resistor is 0 to 5KΩ.
[0007] According to the locomotive speed sensor test bench as described above, it is characterized in that the controller is a S7-200 PLC controller.
[0008] The beneficial effects of the present invention are: first, the error range of the speed sensor can be automatically determined; second, the speed can be changed according to requirements to test the test error at different speeds; third, even if the speed sensor being checked has a circuit fault, it will not cause damage to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a schematic diagram of the structure of the present invention.
[0010] Figure 2 It is a structural schematic diagram of the control device of the present invention.
[0011] Figure 3 Schematic diagram of the measurement module.
[0012] Figure 4 This is a schematic diagram of the pulse output module.
[0013] Explanation of the accompanying drawings: test bench 1, pulse motor 2, speed sensor 3, control device 4, controller 41, pulse output module 42, measurement module 43, coupling 5, AC / DC power supply V, thyristor D1, pulse power IGBTQ, pulse transformer T, gate resistor R1, voltage regulating resistor R3, voltage dividing resistor R2, photocoupler U1, output resistor R4, main resistor R5, dividing resistor R6, control signal line K. DETAILED DESCRIPTION
[0014] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.
[0015] like Figure 1 and Figure 2 As shown, the locomotive speed sensor test bench of the present invention includes a test bench 1, a pulse motor 2, a speed sensor 3, a control device 4 and a coupling 5, wherein the pulse motor 2 and the speed sensor 3 are fixed on the test bench 1, the pulse motor 2 and the speed sensor 3 are connected through the coupling 5, the control device 4 includes a controller 41, a pulse output module 42, and a measuring module 43, the pulse output module 42 is connected to the pulse motor 2 for controlling the rotation speed of the pulse motor 2, and the measuring module 43 is connected to the speed sensor 3 for measuring the output of the speed sensor 3.
[0016] like Figure 3As shown, the measuring module 43 of the present invention includes an AC / DC power supply V, a thyristor D1, a pulse power IGBTQ, a pulse transformer T, a gate resistor R1, a voltage regulating resistor R3, and a voltage dividing resistor R2. The AC / DC power supply V is connected to the mains, and the AC / DC power supply V converts the mains into DC power. The positive electrode of the DC output of the AC / DC power supply V is respectively connected to the anode of the thyristor D1 and one end of the voltage regulating resistor R3, and the other end of the voltage regulating resistor R3 is connected to the emitter of the pulse power IGBTQ. The cathode of the thyristor D1 is connected to the gate of the pulse power IGBT through the gate resistor R1, the control electrode of the thyristor D1 is connected to the output signal line of the speed sensor 3, the collector of the pulse power IGBTQ is connected to the DC ground through the voltage dividing resistor R2, the input end of the pulse transformer T is connected in parallel with the voltage dividing resistor R2, and the output end of the pulse transformer T is connected to the pulse acquisition port of the controller 41. The thyristor D1 of the present invention is preferably a fast thyristor to adapt to the output of pulses of different speeds. The measuring module 43 of the present invention isolates the signal of the speed sensor 3, and even if there is a circuit fault in the speed sensor 3 being checked, it will not cause damage to the equipment.
[0017] The voltage-dividing resistor R2 of the present invention can be 1KΩ, and the voltage-adjusting range of the voltage-adjusting resistor R3 is 0 to 5KΩ. In this way, the device of the present invention can output the divided voltage as required, so that the output voltage adjustment range of the pulse transformer T is larger.
[0018] like Figure 4 As shown, the pulse output module 42 of the present invention includes a photocoupler U1, a main resistor R5, a branch resistor R6 and an output resistor R4. The anode of the photocoupler U1 is connected to the pulse output end of the controller 41, the cathode of the photocoupler U1 is connected to the DC ground, the emitter of the photocoupler U1 is connected to the output resistor R4, and the emitter is connected to the control signal line K of the pulse motor 2; the collector of the photocoupler U1 is connected to the positive pole of the DC power supply after passing through the branch resistor R6. In this way, the pulse output by the control device of the present invention is photoelectrically isolated from the pulse motor, the operation of the pulse motor will not affect the control device, and the external interference of the control device is reduced. At the same time, the size of the pulse signal can also be adjusted by adjusting the size of the branch resistor R6, which is convenient for debugging and maintenance of the equipment. The main resistor R5 of the present invention can be connected in series with the photocoupler U1 to adjust the size of the circuit current of the photocoupler U1.
[0019] The controller 41 of the present invention has a pulse output module and a high-speed pulse input module. For example, if a S7-200 series PLC controller is used, the controller can directly output pulses, isolate the output through the pulse output module 42, and adjust the pulse output amplitude, so as to directly control the rotation of the pulse motor 2. The controller 41 of the present invention can also use common control chips such as single-chip microcomputers and DSPs.
[0020] The working process of the present invention is: a pulse signal is output through the controller 41, so that the pulse motor 2 rotates according to the number of pulses, driving the corresponding speed sensor 3 to rotate. The pulse signal output by the speed sensor 3 is converted by the measuring module 43 and collected by the controller 41. Since the output pulse corresponds to the speed of the motor, the number of pulses output by the controller 41 determines the number of pulses collected. If there is a deviation between the actual number of pulses collected and the theoretical number of pulses, the controller 41 can automatically determine the error range of the speed sensor 3, and can continuously change the speed as required to test the test error at different speeds.
Claims
1. A locomotive speed sensor test bench, comprising a test bench, a pulse motor, a speed sensor, a control device and a coupling, wherein the pulse motor and the speed sensor are fixed on the test bench, and the pulse motor and the speed sensor are connected through a coupling, characterized in that: The control device includes a controller, a pulse output module, and a measuring module. The pulse output module is connected to the pulse motor, and the measuring module is connected to the speed sensor. The measuring module includes an AC / DC power supply, a thyristor, a pulse power IGBT, a pulse transformer, a gate resistor, a voltage regulating resistor, and a voltage dividing resistor. The positive electrode of the DC output of the AC / DC power supply is respectively connected to the anode of the thyristor and one end of the voltage regulating resistor, and the other end of the voltage regulating resistor is connected to the emitter of the pulse power IGBT. The cathode of the thyristor is connected to the gate of the pulse power IGBT through the gate resistor. The control electrode of the thyristor is connected to the output signal line of the speed sensor, and the collector of the pulse power IGBT is connected to the gate of the pulse power IGBT. The anode of the photoelectric coupler is connected to the DC ground through a voltage-dividing resistor, the input end of the pulse transformer is connected to the voltage-dividing resistor in parallel, and the output end of the pulse transformer is connected to the pulse acquisition port of the controller; the pulse output module includes a photoelectric coupler, a voltage-dividing resistor and an output resistor, the anode of the photoelectric coupler is connected to the pulse output end of the controller, the cathode of the photoelectric coupler is connected to the DC ground, the emitter of the photoelectric coupler is connected to the output resistor, and the emitter is connected to the pulse motor control signal line; the collector of the photoelectric coupler is connected to the positive electrode of the DC power supply after passing through the voltage-dividing resistor; the thyristor is a fast thyristor; the voltage-dividing resistor is 1KΩ, and the voltage regulating range of the voltage regulating resistor is 0 to 5KΩ.
2. A locomotive speed sensor test bench according to claim 1, characterized in that: The controller is S7-200PLC controller.
Citation Information
Patent Citations
Locomotive speed sensor test bench
CN209182353U