A speed sensor test device

Abstract

The utility model relates to a kind of sensor testing device, to solve the technical problem that the existing speed sensor test testing device exists volume and weight are larger, lead to inconveniently move, use inconveniently, and cannot well satisfy the technical problem of testing speed sensor under high temperature, low temperature, hygrothermal cycle, vibration and mechanical impact environment.The utility model provides a kind of speed sensor test testing device, including U type mounting seat, signal generator, DC power supply and oscilloscope;One side arm of U type mounting seat is provided with M electromagnetic coils, another side arm is provided with M threaded holes, each threaded hole is used to install one speed sensor to be tested, wherein M is greater than or equal to 1;The output end of signal generator and the input end of electromagnetic coil are electrically connected, the output end of DC power supply and the input end of speed sensor are electrically connected, and the input end of oscilloscope and the output end of speed sensor are connected.

Description

Technical Field

[0001] This utility model relates to a sensor testing device, specifically a speed sensor testing device. Background Technology

[0002] Speed ​​sensors are a key component of automotive electronic control systems. They include tachometer sensors and odometer sensors. Tachometer sensors primarily monitor engine speed and provide speed data. The vehicle's electronic control unit (ECU) uses this speed data to adjust parameters such as fuel injection quantity and ignition timing to ensure normal and efficient engine operation. Odometer sensors primarily detect vehicle speed and transmit speed signals. The vehicle's control computer uses these speed signals to control engine idling speed, automatic transmission torque converter lock-up, automatic transmission shifting, engine cooling fan operation, and cruise control. The driver can also control the vehicle's driving status by checking the speed. Therefore, the performance of speed sensors directly affects the overall vehicle performance and safety, and extensive performance and safety tests are required before the vehicle leaves the factory.

[0003] Chinese patent document CN212932679U discloses an adjustable speed sensor performance testing device, including a housing, gears, a servo motor, and a transmission mechanism. The servo motor drives the gear located inside the housing to rotate via the transmission mechanism. The side of the housing opposite the gear teeth is used to mount the speed sensor to be tested, and the probe of the speed sensor faces the gear teeth. This solution uses a servo motor to drive the gear as a speed signal source, and tests the performance of the speed sensor at different speeds by adjusting the speed of the servo motor. However, due to the use of a servo motor, gears, and related devices, it has a large size and weight, making it inconvenient to move and use. In addition, because the device and its required power supply system have high environmental requirements, it cannot adequately meet the testing requirements of speed sensors under high temperature, low temperature, humid heat cycling, vibration, and mechanical shock environments. Utility Model Content

[0004] The purpose of this invention is to solve the technical problems of existing speed sensor testing devices, which are large in size and weight, making them inconvenient to move and use, and unable to meet the technical requirements of testing speed sensors under high temperature, low temperature, humid heat cycling, vibration and mechanical shock environments. Therefore, this invention provides a speed sensor testing device.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A speed sensor testing device, characterized by the following features:

[0007] Includes a U-shaped mounting bracket, a signal generator, a DC power supply, and an oscilloscope;

[0008] M electromagnetic coils are installed on one side arm of the U-shaped mounting base, and M electromagnetic coils are installed on the other side arm.

[0009] There are M threaded holes, each used to install a speed sensor to be tested, where M≥1;

[0010] The output terminal of the signal generator is electrically connected to the input terminal of the electromagnetic coil, which is used to provide a periodically changing current to the electromagnetic coil, thereby generating a periodically changing magnetic field in the electromagnetic coil.

[0011] The output terminal of the DC power supply is used to electrically connect to the input terminal of the speed sensor under test, so as to power the speed sensor under test.

[0012] A test interval is provided between the transmitting end of the electromagnetic coil and the receiving end of the speed sensor under test, so that the speed sensor under test can sense the periodically changing magnetic field generated by the electromagnetic coil, thereby exciting a periodically changing current and converting the periodically changing current into a periodically changing signal wave.

[0013] The input terminal of the oscilloscope is connected to the output terminal of the speed sensor, and is used to display the periodically changing signal wave output by the speed sensor under test.

[0014] Furthermore, the other side arm is also provided with M auxiliary mounting holes for assisting in the installation of the speed sensor.

[0015] Furthermore, M=2N, N≥1, where N threaded holes are used to install the odometer sensor and the other N threaded holes are used to install the speed sensor.

[0016] Furthermore, we define the following: the test interval between the transmitting end of the electromagnetic coil and the receiving end of the speed sensor under test is L1, and the test interval between the transmitting end of the electromagnetic coil and the receiving end of the odometer sensor under test is L2; ​​then we have: L1 = 1.2 ± 0.8 mm, L2 = 1.4 ± 0.6 mm.

[0017] Furthermore, one side arm of the U-shaped mounting base is provided with M coil fixing through holes, and the electromagnetic coil is set in the coil fixing through holes through an elastic bushing.

[0018] Furthermore, it also includes a coil fixing pressure plate; one side arm of the U-shaped mounting base is also provided with M+1 pressure plate fixing threaded holes, of which M-1 are located between two adjacent coil fixing through holes, and the other two are located outside the two coil fixing through holes at both ends;

[0019] The coil fixing plate is provided with a fixing hole that corresponds one-to-one with the fixing thread hole of the pressure plate;

[0020] The coil fixing plate and the end of the electromagnetic coil near the signal generator are tightly attached, and are connected to one side arm of the U-shaped mounting base by mounting screws passing through the fixing hole and the threaded hole of the plate, in order to prevent the electromagnetic coil from loosening or falling out during vibration and impact.

[0021] Furthermore, the bottom of the U-shaped mounting base is provided with at least two mounting base fixing holes for mounting the U-shaped...

[0022] The mounting base is fixed on the vibration table or mechanical impact table.

[0023] Furthermore, the speed sensor to be tested is either three tachometer sensors or three odometer sensors; the tachometer sensors are mounted on the U-shaped mounting base via threaded holes and through auxiliary mounting holes.

[0024] Fixed; the odometer sensor is mounted on the U-shaped mounting bracket via a threaded hole.

[0025] Furthermore, the signal generator is a single unit, whose output terminal is electrically connected to the input terminals of three electromagnetic coils;

[0026] The oscilloscope consists of three devices. The input terminals of the three oscilloscopes are electrically connected to the output terminals of the three speed sensors, or to the output terminals of the three odometer sensors, or partially to the output terminals of the speed sensors and partially to the output terminals of the odometer sensors.

[0027] The beneficial effects of this utility model are:

[0028] 1. The speed sensor testing device provided by this utility model can simulate different rotational speeds by adjusting the output frequency of the signal generator. It is easy to operate, has an intuitive display, and can meet the testing requirements at different rotational speeds.

[0029] 2. The speed sensor testing device provided by this utility model can meet the requirements of climate load testing, vibration testing and mechanical shock testing of speed sensors in low temperature, high temperature and high humidity environments;

[0030] 3. The speed sensor testing device provided by this utility model has a small overall size and light weight, making it easy to move and convenient to use;

[0031] 4. The speed sensor testing device provided by this utility model adopts a modular design, which can be easily expanded to test more samples. Attached Figure Description

[0032] Figure 1 This is an exploded view of an embodiment of a speed sensor testing device according to the present invention (showing the speed sensor being tested).

[0033] Explanation of reference numerals in the attached diagram: 1-U-shaped mounting base, 2-signal generator, 3-DC power supply, 4-oscilloscope, 5-speed sensor, 6-electromagnetic coil, 7-elastic bushing, 8-coil fixing through hole, 9-threaded hole, 10-mounting base fixing hole, 11-pressure plate fixing threaded hole, 12-auxiliary mounting hole, 13-coil fixing pressure plate, 14-pressure plate fixing hole, 15-odometer sensor. Detailed Implementation

[0034] This utility model discloses a speed sensor testing device, such as... Figure 1 As shown, it includes a U-shaped mounting base 1, a signal generator 2, a DC power supply 3, an oscilloscope 4, an electromagnetic coil 6, an elastic bushing 7, and a coil fixing plate 13;

[0035] M coil fixing through holes 8 are provided on one side arm of the U-shaped mounting base 1. In this embodiment, M is three. Three electromagnetic coils 6 are sequentially arranged on the coil fixing through holes 8. The output terminal of the signal generator 2 is electrically connected to the input terminal of the electromagnetic coil 6 to provide periodically changing current to the electromagnetic coil 6, so that the electromagnetic coil 6 generates a periodically changing magnetic field. The electromagnetic coils 6 are sequentially arranged on the three coil fixing through holes 8 of the U-shaped mounting base 1 through elastic bushings 7. The elastic bushings 7 can realize functions such as vibration reduction, noise reduction, deviation compensation, and protection of electromagnetic coils 6 through the deformation capability of elastic material.

[0036] A pressure plate fixing threaded hole 11 is provided between two adjacent coil fixing through holes 8, and a pressure plate fixing threaded hole 11 is provided on the outer side of the coil fixing through holes 8 at both ends. The coil fixing pressure plate 13 is provided with pressure plate fixing holes 14 that correspond one-to-one with the pressure plate fixing threaded holes 11. The coil fixing pressure plate 13 and the end of the electromagnetic coil 6 near the signal generator 2 are closely attached, and are threadedly connected to the U-shaped mounting base 1 through the pressure plate fixing holes 14 and the pressure plate fixing threaded holes 11. This is used to prevent the electromagnetic coil 6 from loosening or falling out during vibration and impact tests.

[0037] The other side arm of the U-shaped mounting bracket 1 is provided with M threaded holes 9, each threaded hole 9 is used to install a speed sensor to be tested, where M≥1; the other side arm is also provided with M auxiliary mounting holes 12, which are used to install auxiliary speed sensors 5.

[0038] In this embodiment, there is one signal generator 2, whose output terminal is electrically connected to the input terminals of three electromagnetic coils 6. The other side arm is provided with three threaded holes 9 and auxiliary mounting holes 12. If it is necessary to test the speed sensor 5, it is sequentially mounted on the threaded holes 9 and fixed through the auxiliary mounting holes 12. There is one oscilloscope 4, whose input terminals are sequentially electrically connected to the output terminals of the three speed sensors 5. The input terminals of the speed sensors 5 are electrically connected to the output terminals of the DC power supply 3, which supplies power to the speed sensors 5. A connection is provided between the receiving terminal of the speed sensor under test and the transmitting terminal of the electromagnetic coil 6. The test interval is 1.2±0.8mm. If the odometer sensor 15 needs to be tested, it is set on the threaded hole 9 in sequence. The input end of the odometer sensor 15 is electrically connected to the output end of the DC power supply 3. There is one oscilloscope 4. The input end of the oscilloscope 4 is electrically connected to the output ends of the three odometer sensors 15 in sequence. The DC power supply 3 is used to power the odometer sensor 15. The test interval between the receiving end of the odometer sensor to be tested and the transmitting end of the electromagnetic coil 6 is set to L2=1.4±0.6mm. The oscilloscope 4 is used to display the signal wave output by the speed sensor 5 or the odometer sensor 15.

[0039] The working process of the speed sensor test device in this embodiment is as follows:

[0040] DC power supply 3 supplies power to speed sensor 5. Signal generator 2 provides periodically changing current to electromagnetic coil 6, causing electromagnetic coil 6 to generate a periodically changing magnetic field. Speed ​​sensor 5 generates a changing current through the excitation of the changing magnetic field. The current is then amplified and shaped into a square wave signal by internal circuitry and output, and displayed on oscilloscope 4. The normality of speed sensor 5 is determined by observing the waveform.

[0041] When conducting climate load tests under different temperature and humidity conditions, the signal generator 2, DC power supply 3, and oscilloscope 4 can be placed outside the environmental chamber, while the other parts are placed inside the environmental chamber, so that the signal generator 2 is not affected by the climate and can output a periodically changing current normally.

[0042] Contents not described in detail in this specification are prior art well-known to those skilled in the art. The examples provided are merely for illustrative purposes and are not intended to limit the scope of the invention. The scope of the invention is defined by the appended claims. All equivalent substitutions and modifications made without departing from the spirit and principles of the invention should be included within its scope.

Claims

1. A speed sensor testing device, characterized in that: Includes a U-shaped mounting bracket (1), a signal generator (2), a DC power supply (3), and an oscilloscope (4); The U-shaped mounting base (1) has M electromagnetic coils (6) on one side arm and M threaded holes (9) on the other side arm. Each threaded hole (9) is used to install a speed sensor to be tested, where M ≥ 1. The output terminal of the signal generator (2) is electrically connected to the input terminal of the electromagnetic coil (6) to provide a periodically changing current to the electromagnetic coil (6), thereby generating a periodically changing magnetic field in the electromagnetic coil (6); The output terminal of the DC power supply (3) is used to electrically connect to the input terminal of the speed sensor under test to power the speed sensor under test. A test interval is provided between the transmitting end of the electromagnetic coil (6) and the receiving end of the speed sensor to be tested, so that the speed sensor to be tested can sense the periodically changing magnetic field generated by the electromagnetic coil (6), thereby exciting a periodically changing current and converting the periodically changing current into a periodically changing signal wave. The input terminal of the oscilloscope (4) is connected to the output terminal of the speed sensor, and is used to display the periodic change signal wave output by the speed sensor to be tested.

2. The speed sensor testing device according to claim 1, characterized in that: The other side arm is also provided with M auxiliary mounting holes (12) for the installation of the speed sensor (5).

3. The speed sensor testing device according to claim 2, characterized in that: M = 2N, N ≥ 1, wherein N threaded holes (9) are used to install the odometer sensor (15), and the other N threaded holes (9) are used to install the speed sensor (5).

4. The speed sensor testing device according to claim 1, characterized in that: Definition: The test interval set between the transmitting end of the electromagnetic coil (6) and the receiving end of the speed sensor to be tested is L1, and the test interval set between the transmitting end and the receiving end of the odometer sensor to be tested is L2; ​​then: L1=1.2±0.8mm, L2=1.4±0.6mm.

5. The speed sensor testing device according to claim 1, characterized in that: M coil fixing through holes (8) are provided on one side arm of the U-shaped mounting base (1), and the electromagnetic coil (6) is set in the coil fixing through hole (8) through an elastic bushing (7).

6. The speed sensor testing device according to claim 5, characterized in that: It also includes a coil fixing plate (13); The U-shaped mounting base (1) is also provided with M+1 pressure plate fixing threaded holes (11) on one side arm, of which M-1 are located between two adjacent coil fixing through holes (8), and the other two are located outside the two coil fixing through holes (8) at both ends; The coil fixing plate (13) is provided with a fixing hole (14) that corresponds one-to-one with the fixing threaded hole (11) of the plate; The coil fixing plate (13) and the electromagnetic coil (6) are closely attached to one end of the signal generator (2), and are connected to one side arm of the U-shaped mounting base (1) by mounting screws passing through the fixing hole (14) and the fixing threaded hole (11) of the plate, in order to prevent the electromagnetic coil (6) from loosening or falling out during vibration and impact.

7. The speed sensor testing device according to claim 6, characterized in that: The bottom of the U-shaped mounting base (1) is provided with at least two mounting base fixing holes (10) for fixing the U-shaped mounting base (1) on the vibration table or mechanical impact table.

8. The speed sensor testing device according to claim 3, characterized in that: The speed sensor to be tested is either three speed sensors (5) or three odometer sensors (15); The speed sensor (5) is mounted on the U-shaped mounting base (1) through the threaded hole (9) and fixed through the auxiliary mounting hole (12); the odometer sensor (15) is mounted on the U-shaped mounting base (1) through the threaded hole (9).

9. A speed sensor testing device according to claim 8, characterized in that: The signal generator (2) is a single unit, and its output terminal is electrically connected to the input terminals of the three electromagnetic coils (6). There are three oscilloscopes (4). The input terminals of the three oscilloscopes (4) are electrically connected to the output terminals of the three speed sensors (5), or to the output terminals of the three odometer sensors (15), or part of them are electrically connected to the output terminals of the speed sensors (5) and the other part is electrically connected to the output terminals of the odometer sensors (15).

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