A calibration device for engine speed measuring instrument

Abstract

The present invention belongs to the technical field of detection instruments, and proposes an engine speed measuring instrument calibration device, including a vibration table, the vibration table includes a stand, a main shaft, which is arranged on the stand, a vibration component, including a coil and a magnet, the coil is arranged on the stand, a set of magnets is arranged on the outside of the main shaft, used to drive the main shaft to move axially, and a workbench, which is connected to the main shaft and is used to fix a vibration sensor. Through the above technical solution, the problem of poor accuracy of the engine speed measuring instrument calibration device in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of detection instruments and relates to a calibration device for an engine speed measuring instrument. Background Art

[0002] The engine speed measuring instrument calibration device is a device for calibrating the engine speed measuring instrument, and the calibration device generates a standard signal source, including vibration, charging signal waveform and high-voltage ignition pulse, as a calibration signal for the motor vehicle engine speed measuring instrument. At present, the standard signal source generated by the engine speed measuring instrument calibration device cannot reflect the signal waveform of the actual automobile transmitter, resulting in poor calibration accuracy. Summary of the invention

[0003] The invention provides an engine speed measuring instrument calibration device, which solves the problem of poor accuracy of the engine speed measuring instrument calibration device in the prior art.

[0004] The technical solution of the present invention is implemented as follows: comprising a vibration table, the vibration table comprising

[0005] Stand,

[0006] A main shaft is arranged on the frame,

[0007] A vibration component, comprising a coil and a magnet, wherein the coil is arranged on the stand, and a set of the magnets is arranged outside the main shaft, and is used to drive the main shaft to move axially.

[0008] A workbench is connected to the main shaft and is used to fix the vibration sensor.

[0009] Furthermore, the vibration table also includes a spring 1, the workbench is arranged at one end of the main shaft, the spring set is arranged on the outside of the main shaft, and the spring 1 is located between the workbench and the magnet 1.

[0010] Furthermore, the vibration table also includes

[0011] A sleeve, one end of which is sleeved on the end of the main shaft, and the other end of which is provided with a receiving cavity.

[0012] The second vibration component includes a second coil and a second magnet. The second coil is wound around the outside of the shaft sleeve, and the second magnet is arranged in the accommodating cavity and reciprocates along the axial direction of the main shaft.

[0013] Furthermore, the vibration table also includes a spring pressing plate, the middle part of the spring pressing plate is connected to the main shaft, and both ends of the spring pressing plate are arranged on the platform.

[0014] Furthermore, the spring pressing sheet and the workbench are respectively arranged at two ends of the main shaft.

[0015] Furthermore, the vibration table also includes a speaker, which is arranged on the stand and is used to be connected to a main control circuit.

[0016] Furthermore, it also includes a vibration control circuit 1, which includes a driver chip 1. The input of the driver chip 1 is used to connect to the main control circuit, and the output of the driver chip 1 is connected to the coil 1.

[0017] Furthermore, it also includes a vibration control circuit 2, which includes a driving chip 2. The input of the driving chip 2 is used to connect to the main control circuit, and the output of the driving chip 2 is connected to the coil 2.

[0018] Furthermore, it also includes a pulse ignition circuit, which includes a thirteenth switch tube, an ignition coil and a current limiting circuit connected in sequence, and the thirteenth switch tube is used to be connected to the main control circuit.

[0019] The current limiting circuit includes a parallel branch 1, a parallel branch 2, a parallel branch 3, a relay 1 and a relay 2. The resistances of the parallel branch 1, the parallel branch 2 and the parallel branch 3 are different. One end of the parallel branch 2 is connected to the ignition coil, and the other end is used to connect to the battery.

[0020] The output end of the relay 1 is connected to the parallel branch 1, and the output end of the relay 2 is connected to the parallel branch 3.

[0021] The input end of the relay 1 and the input end of the relay 2 are used to be connected to the main control circuit.

[0022] Furthermore, it also includes a battery charging and discharging circuit, which includes a battery charging circuit and a battery discharging circuit.

[0023] The battery charging circuit includes multiple paths with the same circuit structure, one of which includes a fifth switch tube, a driving resistor RJ1 and a switch tube circuit connected in sequence, the control end of the fifth switch tube is used to connect to the main control circuit, the first end of the fifth switch tube is connected to the control end of the switch tube circuit through the driving resistor RJ1, and the second end of the fifth switch tube is grounded.

[0024] One end of the switch tube circuit is connected to a DC power supply, and the other end is used to connect to a battery.

[0025] The driving resistances of the multiple battery charging circuits are different, and the switch tubes of the multiple battery charging circuits are all connected to the main control circuit.

[0026] The battery discharge circuit comprises a discharge resistor and a ninth switch tube which are connected in sequence. The discharge resistor is used to be connected to the battery, and the input of the ninth switch tube is used to be connected to the main control circuit.

[0027] The working principle and beneficial effects of the present invention are:

[0028] 1. The present invention controls the commutation of the current in coil 1 through the main control circuit, so that magnet 1 moves back and forth, magnet 1 drives the main shaft to move back and forth, the main shaft drives the workbench to move back and forth, simulates the vibration signal of the engine, the vibration sensor senses the signal, and calibrates the vibration induction type speed measuring instrument.

[0029] The present invention simulates the vibration effect of a real engine when it rotates, which is beneficial to improving the calibration accuracy of a vibration induction type rotation speed measuring instrument.

[0030] 2. If Figure 1 As shown, in the present invention, spring 1 is arranged between the workbench and magnet 1 to play a supporting role to prevent the workbench from sliding off the main shaft, and as the main shaft moves upward, spring 1 is compressed. When the main shaft moves downward, the reaction force of spring 1 helps to ensure the vibration effect.

[0031] 3. The present invention controls the commutation of the current in coil 2 through the main control circuit, so that magnet 2 moves back and forth, and magnet 2 hits the main shaft to simulate the knock effect of the engine; the speaker is connected to the main control circuit to amplify the sound signal output by the main control circuit, simulating the vibration sound effect when the engine rotates, and further approaching the actual working condition of the engine rotation.

[0032] 4. Coil 2 needs an external power line when working. If the spindle rotates while reciprocating along its axis, or if the spindle rotates due to human error, the spindle will drive sleeve 2 to rotate, causing the external line of coil 2 to be entangled and then there is a risk of breaking. In the present invention, the spring pressing plate plays a limiting role to prevent the spindle from rotating; the spring pressing plate and the workbench are respectively arranged at both ends of the spindle, and the moving trajectory of the spindle is limited from the end position, which is conducive to improving the limiting effect.

[0033] 5. In the present invention, the main control circuit realizes the commutation of the current in coil one by outputting a control signal to the vibration control circuit one, thereby realizing the reciprocating movement of magnet one to simulate the vibration signal of the engine; the main control circuit realizes the commutation of the current in coil two by outputting a control signal to the vibration control circuit two, thereby realizing the reciprocating movement of magnet two to simulate the knock effect of the engine.

[0034] 6. In the present invention, the main control circuit controls the on-off of the ignition coil and the ignition frequency through the thirteenth switch tube; at the same time, the main control circuit controls the connection between parallel branch one and parallel branch two by controlling the on-off of relay one, and the main control circuit controls the connection between parallel branch three and parallel branch two by controlling the on-off of relay two, thereby adjusting the resistance value of the current limiting circuit. The resistance value of the current limiting circuit can adjust the strength of the ignition signal.

[0035] The present invention simulates a real ignition signal, which is beneficial to improving the calibration accuracy of a high-voltage ignition pulse induction type speed measuring instrument.

[0036] 7. In the present invention, the main control circuit can select different battery charging circuits by outputting control signals to corresponding amplifier circuits, and can adjust the charging frequency of the battery charging circuit by changing the output frequency of the control signal; the driving resistances of multiple battery charging circuits are different, corresponding to different charging signal amplitudes, so as to meet the needs of various battery charging and discharging speed measuring instruments.

[0037] The main control circuit can control the battery discharge by outputting a control signal to the ninth switch tube, and the discharge frequency of the battery discharge circuit can be adjusted by changing the output frequency of the control signal.

[0038] The present invention simulates real battery charging and discharging signals, which is beneficial to improving the calibration accuracy of a battery charging and discharging speed measuring instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] Figure 1 It is a schematic diagram of the structure of the vibration table of the present invention;

[0041] Figure 2 It is a schematic diagram of the internal structure of the vibration table in the present invention;

[0042] Figure 3 A circuit schematic diagram of a vibration control circuit in the present invention;

[0043] Figure 4 It is the circuit principle diagram of the second vibration control circuit in the present invention;

[0044] Figure 5 This is a schematic diagram of the speaker control circuit in the present invention;

[0045] Figure 6 This is a schematic diagram of a pulse ignition circuit in the present invention;

[0046] Figure 7 This is a schematic diagram of the battery charging and discharging circuit in the present invention;

[0047] Figure 8This is the principle diagram of the main control circuit in the present invention;

[0048] In the figure: 1-vibration table, 2-stand, 3-spindle, 4-vibration component 1, 41-coil 1, 42-magnet 1, 5-workbench, 6-spring 1, 7-spring pressing plate, 8-shaft sleeve, 81-accommodation cavity, 9-vibration component 2, 91-coil 2, 92-magnet 2, 10-speaker, 11-vibration control circuit 1, 111-drive chip 1, 12-vibration control circuit 2, 121-drive chip 2, 13-pulse ignition circuit, 131-thirteenth switch tube, 132-point Ignition coil, 133-current limiting circuit, 1331-parallel branch one, 1332-parallel branch two, 1333-parallel branch three, 1334-relay one, 1335-relay two, 14-battery charging and discharging circuit, 141-battery charging circuit, 1411-amplifier circuit, 1412-driving resistor, 1413-switching tube circuit, 142-battery discharging circuit, 1421-discharging resistor, 1422-ninth switching tube, 15-speaker driving circuit, 16-main control circuit. DETAILED DESCRIPTION

[0049] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] like Figure 1-Figure 8 As shown, the vibration table 1 includes

[0051] Stand 2,

[0052] The main shaft 3 is arranged on the stand 2.

[0053] The vibration component 4 includes a coil 41 and a magnet 42. The coil 41 is arranged on the stand 2, and the magnet 42 is sleeved on the outer side of the main shaft 3 to drive the main shaft 3 to move axially.

[0054] The workbench 5 is connected to the main shaft 3 and is used to fix the vibration sensor.

[0055] In this embodiment, the main control circuit 16 controls the commutation of the current in the coil 41, so that the magnet 42 moves back and forth, the magnet 42 drives the main shaft 3 to move back and forth, the main shaft 3 drives the workbench 5 to move back and forth, and simulates the vibration signal of the engine. The vibration sensor senses this signal and calibrates the vibration induction type speed meter.

[0056] This embodiment simulates the vibration effect of a real engine when it rotates, which is beneficial to improving the calibration accuracy of the vibration-sensing tachometer.

[0057] Furthermore, the vibration table 1 also includes a spring 6, the workbench 5 is arranged at one end of the main shaft 3, the spring 6 is sleeved on the outside of the main shaft 3, and the spring 6 is located between the workbench 5 and the magnet 42.

[0058] In this embodiment, spring 16 is arranged between the workbench 5 and magnet 142 to play a supporting role to prevent the workbench 5 from sliding off the spindle 3. As the spindle 3 moves upward, spring 16 is compressed. When the spindle 3 moves downward, the reaction force of spring 16 helps to ensure the vibration effect.

[0059] Furthermore, the vibration table 1 also includes

[0060] The sleeve 8 has one end sleeved on the end of the main shaft 3, and the other end of the sleeve 8 is provided with a receiving cavity 81.

[0061] The vibration component 9 includes a coil 91 and a magnet 92 . The coil 91 is wound around the outside of the sleeve 8 , and the magnet 92 is arranged in the accommodating cavity 81 and reciprocates along the axial direction of the main shaft 3 .

[0062] In this embodiment, the main control circuit 16 controls the commutation of the current in the coil 2 91, so that the magnet 2 92 moves back and forth, and the magnet 2 92 hits the main shaft 3 to simulate the knock effect of the engine; the speaker 10 is connected to the main control circuit 16 to amplify the sound signal output by the main control circuit 16, simulating the vibration sound effect when the engine is rotating, and further approaching the actual working condition of the engine rotation.

[0063] Furthermore, the vibration table 1 further comprises a spring pressing plate 7 , the middle portion of the spring pressing plate 7 is connected to the main shaft 3 , and both ends of the spring pressing plate 7 are arranged on the stand 2 .

[0064] Furthermore, the spring pressing sheet 7 and the workbench 5 are respectively arranged at two ends of the main shaft 3 .

[0065] The coil 2 91 needs an external power line when working. If the spindle 3 rotates while reciprocating along its axis, or the spindle 3 rotates due to human error, the spindle 3 will drive the sleeve 2 8 to rotate, thereby causing the external line of the coil 2 91 to be entangled and then there is a risk of breaking. In this embodiment, the spring pressing piece 7 plays a limiting role to prevent the spindle 3 from rotating; the spring pressing piece 7 and the workbench 5 are respectively arranged at both ends of the spindle 3, and the moving trajectory of the spindle 3 is limited from the end position, which is conducive to improving the limiting effect.

[0066] Furthermore, the vibration table 1 further includes a speaker 10 , which is disposed on the stand 2 , and is used to be connected to the main control circuit 16 .

[0067] Furthermore, it also includes a vibration control circuit 11, which includes a driving chip 111, an input of the driving chip 111 is used to connect to the main control circuit 16, and an output of the driving chip 111 is connected to the coil 41.

[0068] Furthermore, it also includes a vibration control circuit 12 , which includes a driver chip 121 . The input of the driver chip 121 is used to connect to the main control circuit 16 , and the output of the driver chip 121 is connected to the coil 91 .

[0069] In this embodiment, the main control circuit 16 realizes the commutation control of the current in the coil 41 by outputting a control signal to the vibration control circuit 11, thereby realizing the reciprocating movement of the magnet 42 to simulate the vibration signal of the engine; the main control circuit 16 realizes the commutation control of the current in the coil 2 91 by outputting a control signal to the vibration control circuit 2 12, thereby realizing the reciprocating movement of the magnet 2 92 to simulate the knock effect of the engine.

[0070] Furthermore, it also includes a pulse ignition circuit 13, which includes a thirteenth switch tube 131, an ignition coil 132 and a current limiting circuit 133 connected in sequence, and the thirteenth switch tube 131 is used to be connected to the main control circuit 16.

[0071] The current limiting circuit 133 includes a parallel branch 1 1331, a parallel branch 2 1332, a parallel branch 3 1333, a relay 1 1334 and a relay 2 1335. The resistances of the parallel branch 1 1331, the parallel branch 2 1332 and the parallel branch 3 1333 are different. One end of the parallel branch 2 1332 is connected to the ignition coil 132, and the other end is used to connect to the battery.

[0072] The output end of relay 1 1334 is connected to parallel branch 1 1331, and the output end of relay 2 1335 is connected to parallel branch 3 1333.

[0073] The input end of relay 1 1334 and the input end of relay 2 1335 are used to connect to the main control circuit 16 .

[0074] In this embodiment, the main control circuit 16 controls the on-off of the ignition coil 132 and the ignition frequency through the thirteenth switch tube 131; at the same time, the main control circuit 16 controls the connection between the parallel branch 1 1331 and the parallel branch 2 1332 by controlling the on-off of the relay 1 1334, and the main control circuit 16 controls the connection between the parallel branch 3 1333 and the parallel branch 2 1332 by controlling the on-off of the relay 2 1335, thereby adjusting the resistance value of the current limiting circuit 133. The resistance value of the current limiting circuit 133 can adjust the strength of the ignition signal.

[0075] This embodiment simulates a real ignition signal, which is beneficial to improving the calibration accuracy of the high-voltage ignition pulse induction speed measuring instrument.

[0076] Furthermore, it also includes a battery charging and discharging circuit 14, which includes a battery charging circuit 141 and a battery discharging circuit 142.

[0077] The battery charging circuit 141 includes multiple circuits with the same circuit structure, one of which includes a fifth switch tube 1411, a driving resistor RJ1 and a switch tube circuit 1413 connected in sequence, the control end of the fifth switch tube 1411 is used to connect to the main control circuit 16, the first end of the fifth switch tube 1411 is connected to the control end of the switch tube circuit 1413 through the driving resistor RJ1, and the second end of the fifth switch tube 1411 is grounded.

[0078] One end of the switch tube circuit 1413 is connected to the DC power supply, and the other end is used to connect to the battery.

[0079] The driving resistors of the multi-channel battery charging circuit 141 are different, and the switch tubes of the multi-channel battery charging circuit 141 are all connected to the main control circuit 16.

[0080] The battery discharge circuit 142 includes a discharge resistor 1421 and a ninth switch tube 1422 which are connected in sequence. The discharge resistor 1421 is used to be connected to the battery, and the input of the ninth switch tube 1422 is used to be connected to the main control circuit 16 .

[0081] In this embodiment, the main control circuit 16 can select different battery charging circuits 141 by outputting control signals to corresponding amplifier circuits, and can adjust the charging frequency of the battery charging circuit 141 by changing the output frequency of the control signal; the driving resistances of the multiple battery charging circuits 141 are different, corresponding to different charging signal amplitudes, so as to meet the needs of various battery charging and discharging speed measuring instruments.

[0082] The main control circuit 16 can control the battery discharge by outputting a control signal to the ninth switch tube 1422 , and the discharge frequency of the battery discharge circuit 142 can be adjusted by changing the output frequency of the control signal.

[0083] This embodiment simulates real battery charging and discharging signals, which is beneficial to improving the calibration accuracy of the battery charging and discharging speed measuring instrument.

[0084] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine speed measuring instrument calibration device, characterized in that: The invention comprises a vibration table (1), wherein the vibration table (1) comprises Stand (2), A main shaft (3) is arranged on the stand (2). A vibration component (4) comprises a coil (41) and a magnet (42), wherein the coil (41) is arranged on the stand (2), and the magnet (42) is sleeved on the outside of the main shaft (3) and is used to drive the main shaft (3) to move axially. A workbench (5) connected to the main shaft (3) and used to fix the vibration sensor; The vibration table (1) also includes A shaft sleeve (8) is sleeved at one end on the end of the main shaft (3), and the other end of the shaft sleeve (8) is provided with a receiving cavity (81). A second vibration component (9), comprising a second coil (91) and a second magnet (92), wherein the second coil (91) is wound around the outside of the shaft sleeve (8), and the second magnet (92) is arranged in the accommodating cavity (81) and reciprocates along the axial direction of the main shaft (3); It also includes a second vibration control circuit (12), the second vibration control circuit (12) including a second drive chip (121), the input of the second drive chip (121) is used to connect to the main control circuit (16), and the output of the second drive chip (121) is connected to the second coil (91); The device also includes a pulse ignition circuit (13), the pulse ignition circuit (13) including a thirteenth switch tube (131), an ignition coil (132) and a current limiting circuit (133) connected in sequence, the thirteenth switch tube (131) being used to be connected to a main control circuit (16). The current limiting circuit (133) comprises a parallel branch 1 (1331), a parallel branch 2 (1332), a parallel branch 3 (1333), a relay 1 (1334) and a relay 2 (1335); the parallel branch 1 (1331), the parallel branch 2 (1332) and the parallel branch 3 (1333) have different resistances; one end of the parallel branch 2 (1332) is connected to the ignition coil (132), and the other end is used to connect to a battery; The output end of the relay 1 (1334) is connected to the parallel branch 1 (1331), and the output end of the relay 2 (1335) is connected to the parallel branch 3 (1333). The input end of the relay 1 (1334) and the input end of the relay 2 (1335) are used to be connected to the main control circuit (16).

2. The engine speed measuring instrument calibration device according to claim 1, characterized in that: The vibration table (1) further comprises a spring 1 (6); the worktable (5) is arranged at one end of the main shaft (3); the spring 1 (6) is sleeved on the outside of the main shaft (3); and the spring 1 (6) is located between the worktable (5) and the magnet 1 (42).

3. The engine speed measuring instrument calibration device according to claim 1, characterized in that: The vibration table (1) further comprises a spring pressing plate (7), the middle portion of the spring pressing plate (7) being connected to the main shaft (3), and both ends of the spring pressing plate (7) being arranged on the table frame (2).

4. The engine speed measuring instrument calibration device according to claim 3, characterized in that: The spring pressing sheet (7) and the workbench (5) are respectively arranged at two ends of the main shaft (3).

5. The engine speed measuring instrument calibration device according to claim 1, characterized in that: The vibration table (1) further comprises a speaker (10), wherein the speaker (10) is arranged on the stand (2), and the speaker (10) is used to be connected to a main control circuit (16).

6. The engine speed measuring instrument calibration device according to claim 1, characterized in that: It also includes a vibration control circuit (11), wherein the vibration control circuit (11) includes a driver chip (111), the input of the driver chip (111) is used to connect to the main control circuit (16), and the output of the driver chip (111) is connected to the coil (41).

7. The engine speed measuring instrument calibration device according to claim 1, characterized in that: It also includes a battery charging and discharging circuit (14), wherein the battery charging and discharging circuit (14) includes a battery charging circuit (141) and a battery discharging circuit (142). The battery charging circuit (141) comprises a plurality of paths having the same circuit structure, wherein one path comprises a fifth switch tube (1411), a driving resistor RJ1 (1412) and a switch tube circuit (1413) connected in sequence, the control end of the fifth switch tube (1411) being used to be connected to a main control circuit (16), the first end of the fifth switch tube (1411) being connected to the control end of the switch tube circuit (1413) via the driving resistor RJ1 (1412), and the second end of the fifth switch tube (1411) being grounded. One end of the switch tube circuit (1413) is connected to a DC power supply, and the other end is used to connect to a battery. The driving resistances of the multiple battery charging circuits (141) are different, and the switch tubes of the multiple battery charging circuits (141) are all connected to the main control circuit (16). The battery discharge circuit (142) comprises a discharge resistor (1421) and a ninth switch tube (1422) connected in sequence, the discharge resistor (1421) being used to be connected to the battery, and the input of the ninth switch tube (1422) being used to be connected to the main control circuit (16).

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