Crankshaft angle and strain measurement device

Abstract

The embodiment of the present invention provides a crankshaft angle and strain measurement device. The crankshaft angle and strain measurement device provided by the present invention includes: a generator coil, which is installed on the side wall of the crankshaft; a signal processing unit, which is installed on the crank arm of the crankshaft, and the signal processing unit is electrically connected to the generator coil; a strain gauge, which is arranged on the crankshaft, and the strain gauge is electrically connected to the signal processing unit; a multi-pole magnet, which surrounds the crankshaft and is arranged at intervals with the crankshaft, and the multi-pole magnet forms a plurality of magnetic poles at equal angles along the circumference of the crankshaft; the magnetic poles include an N pole and an S pole, and the N pole and the S pole are alternately distributed; a test device, which is located outside the body of the internal combustion engine, and the test device is communicatively connected to the signal processing unit. The crankshaft angle and strain measurement device provided by the present invention can realize the synchronous testing of the crankshaft angle signal and the strain signal.

Description

Technical Field

[0001] The embodiments of the present invention relate to internal combustion engine technology, and more particularly to a crankshaft angle and strain measurement device. Background Art

[0002] During the operation of the internal combustion engine, the piston drives the crankshaft to rotate at high speed. The crankshaft is subjected to explosive pressure and outputs torque. The stress state of the crankshaft often affects the reliability of the internal combustion engine. Therefore, during the debugging of the internal combustion engine, it is necessary to dynamically measure the crankshaft strain at different crankshaft angles to analyze the stress state of the crankshaft.

[0003] In the related art, a slip ring assembly is provided at the end of the crankshaft, a strain gauge is attached to a specific position of the crankshaft, the strain gauge is connected to a first measuring device through the slip ring assembly and a signal line, and the current strain of the crankshaft is displayed through the first measuring device. The current rotation angle of the crankshaft is measured by a bevel gauge, which is connected to a second measuring device through a signal line, and the current rotation angle of the crankshaft is displayed by the second measuring device.

[0004] However, there is a problem of signal asynchrony in the process of measuring the current rotation angle and strain of the crankshaft. Summary of the invention

[0005] An embodiment of the present invention provides a crankshaft angle and strain measurement device to solve the problem of signal asynchrony in the process of measuring the current crankshaft angle and strain.

[0006] According to an embodiment of the present invention, there is provided a crankshaft angle and strain measurement device, comprising:

[0007] A generator coil, wherein the generator coil is mounted on a side wall of the crankshaft;

[0008] A signal processing unit, wherein the signal processing unit is mounted on a crank arm of the crankshaft and is electrically connected to the generator coil;

[0009] A strain gauge, the strain gauge is arranged on the crankshaft, and the strain gauge is electrically connected to the signal processing unit;

[0010] A multi-pole magnet, the multi-pole magnet surrounds the crankshaft and is spaced apart from the crankshaft, the multi-pole magnet forms a plurality of magnetic poles at equal angles along the circumference of the crankshaft; the magnetic poles include N poles and S poles, and the N poles and the S poles are alternately distributed;

[0011] A test device is located outside the body of the internal combustion engine, and the test device is communicatively connected with the signal processing unit.

[0012] In an optional implementation, the signal processing unit includes a power generation conditioning module and a signal processing module, the input end of the power generation conditioning module is electrically connected to the power generation coil, the input end of the signal processing module is electrically connected to the output end of the power generation conditioning module and the strain gauge respectively, and the output end of the signal processing module is communicatively connected to the test equipment. It can be understood by those skilled in the art that the power generation conditioning module can convert the alternating pulse voltage generated by the power generation coil into a crankshaft angle pulse signal, and the current angle of the crankshaft can be obtained through the crankshaft angle pulse signal, and the signal processing module can receive the crankshaft strain signal and the crankshaft angle signal, i.e., the crankshaft angle pulse signal, and transmit the two signals synchronously to the test equipment.

[0013] In an optional implementation, the multipolar magnet is formed as a multipolar arc-shaped magnetic strip, the multipolar arc-shaped magnetic strip is located below the crankshaft and the center of the multipolar arc-shaped magnetic strip is located on the rotating axis of the crankshaft, and the multipolar arc-shaped magnetic strip is fixedly connected to the engine body. It can be understood by those skilled in the art that, on the one hand, setting the multipolar magnet as a multipolar arc-shaped magnetic strip facilitates processing, and on the other hand, the multipolar arc-shaped magnetic strip can avoid moving parts inside the internal combustion engine, such as a camshaft, for easy installation.

[0014] In an optional implementation, there are multiple generating coils, and the multiple generating coils are installed at equal angles on the side wall of the crankshaft, and the degree of the center angle of the multipolar arc magnetic strip is greater than the degree of the center angle of the interval between two adjacent generating coils. It can be understood by those skilled in the art that the above arrangement can ensure that at least one generating coil cuts the magnetic lines of force to generate electrical energy, thereby continuously supplying power to the power generation conditioning module and the signal processing module.

[0015] In an optional implementation, one of the power generation coils is installed at the top of the crank pin of the crankshaft, and the other power generation coils are distributed at equal angles to the top of the crank pin, and the position of the magnetic pole at the lowest end of the multi-polar arc-shaped magnetic strip in the vertical direction is set to be toothless;

[0016] When the generator coil passes through the missing tooth, a missing signal is generated, and the missing signal is used to determine that the crankshaft rotates to the bottom dead center or other phase angles. It can be understood by those skilled in the art that, through the above arrangement, a missing signal is generated when the generator coil passes through the missing tooth, and the missing signal can be used to identify that the crankshaft rotates to a specific phase angle.

[0017] In an optional implementation, it also includes a transmitting antenna and a receiving antenna, wherein the transmitting antenna is mounted on the side wall of the crankshaft, and the input end of the transmitting antenna is electrically connected to the output end of the signal processing module; the receiving antenna is mounted on the body, and the receiving antenna is communicatively connected to the test equipment, and the receiving antenna is used to receive the wireless signal transmitted by the transmitting antenna. It can be understood by those skilled in the art that the above arrangement can realize the wireless transmission of the crankshaft angle signal and the crankshaft strain signal.

[0018] In an optional implementation, there are multiple transmitting antennas, and the multiple transmitting antennas are distributed at equal angles on the side wall of the crankshaft; the receiving antenna is formed into an arc structure surrounding the crankshaft, the center of the arc structure is located on the rotation axis of the crankshaft, and the degree of the center angle of the receiving antenna is greater than the degree of the center angle of the interval between two adjacent transmitting antennas. It can be understood by those skilled in the art that the above arrangement can ensure that at any angle of rotation of the crankshaft, at least one transmitting antenna transmits wireless signals with the receiving antenna, ensuring high-speed continuous transmission of signals.

[0019] In an optional implementation, a signal receiving module is further included, the input end of the signal receiving module is electrically connected to the output end of the receiving antenna, and the output end of the signal receiving module is electrically connected to the test device. It can be understood by those skilled in the art that the signal receiving module can condition the wireless signal received by the receiving antenna into a signal suitable for the test device, and output the conditioned signal to the test device.

[0020] In an optional implementation, the receiving antenna is located on a side of the multipolar magnet away from the crankshaft, and the receiving antenna is fixedly connected to the multipolar magnet. It can be understood by those skilled in the art that the above arrangement can improve the assembly efficiency of the receiving antenna and the multipolar magnet.

[0021] In an optional implementation, there are multiple strain gauges, and the multiple strain gauges are respectively attached to different positions on the crankshaft, and the multiple strain gauges are respectively electrically connected to the signal processing unit. It can be understood by those skilled in the art that the strains at different positions of the crankshaft can be measured through the above arrangement, so that the strain measurement data of the crankshaft is more comprehensive.

[0022] It can be understood by those skilled in the art that the crankshaft angle and strain measuring device of the present invention collects the strain of the crankshaft using strain gauges, and collects the angle of the crankshaft through the generator coil and the multi-pole magnet, that is, it realizes the simultaneous collection of the strain of the crankshaft and the angle of the crankshaft, and the strain signal of the crankshaft and the angle of the crankshaft are synchronously transmitted to the signal processing unit, and the signal processing unit synchronously transmits the two signals to the test equipment, and the test equipment displays the angle and strain of the crankshaft. In this way, it is possible to avoid using two test systems to test the strain and angle of the crankshaft separately, thereby solving the problem of the crankshaft strain signal and the crankshaft angle signal being out of sync. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of a portion of the structure of a crankshaft angle and strain measurement device provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of a crankshaft angle or strain measurement device provided in an embodiment of the present invention;

[0026] Figure 3 for Figure 2 The middle crankshaft angle is a partial enlarged schematic diagram of the strain measurement device at the multi-polar arc magnetic strip and the receiving antenna;

[0027] Figure 4 for Figure 2 A partial enlarged schematic diagram of the crankshaft angle, i.e. the strain measurement device at the generating coil and the transmitting antenna;

[0028] Figure 5 A schematic diagram of a portion of the structure of the crankshaft angle and strain measurement device provided by an embodiment of the present invention from another perspective;

[0029] Figure 6 A schematic diagram of a portion of the structure of the crankshaft angle and strain measurement device provided by an embodiment of the present invention from another perspective;

[0030] Figure 7 for Figure 6 A local enlarged schematic diagram of point A in the middle.

[0031] Description of reference numerals:

[0032] 100, engine body; 200, crankshaft;

[0033] 210, generating coil; 220, signal processing unit;

[0034] 221. Power generation conditioning module; 222. Signal processing module;

[0035] 230, strain gauge; 300, multi-pole arc magnetic strip;

[0036] 310, magnetic pole; 320, missing teeth;

[0037] 400. test equipment; 500. transmitting antenna;

[0038] 600. Receiving antenna; 700. Signal receiving module. DETAILED DESCRIPTION

[0039] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0040] Secondly, it should be noted that in the description of the present invention, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0041] In the related art, a slip ring assembly is provided at the end of the crankshaft, wherein the slip ring assembly includes an inner ring and an outer ring electrically connected to each other, the inner ring is fixed to the end of the crankshaft, and the outer ring is fixed to the body of the internal combustion engine. The inner ring is provided with a through hole for passing the signal line. A strain gauge is attached to a specific position of the crankshaft, and the signal line of the strain gauge is passed through the through hole of the inner ring. The first measuring device is connected to the outer ring through the signal line, and the strain at the specific position of the crankshaft is displayed by the first measuring device. The current angle of rotation of the crankshaft is measured by a bevel gauge, and the bevel gauge is connected to the second measuring device, and the current angle of rotation of the crankshaft is displayed by the second measuring device. However, the angle of rotation and strain of the crankshaft are measured using two independent systems respectively, and there is a difference in the transmission rate of the crankshaft angle signal and the crankshaft strain signal. There is a problem of signal asynchrony in the process of measuring the current angle of rotation and strain of the crankshaft.

[0042] After repeated thinking and verification, the inventor of the present application found that the same measuring device can be used to simultaneously collect the current rotation angle and strain of the crankshaft. The measuring device can be provided with a signal processing unit and a measuring device. After the rotation angle and strain of the crankshaft are collected simultaneously, they can be synchronously transmitted to the signal processing unit of the measuring device. The signal processing unit then synchronously transmits the rotation angle signal of the crankshaft and the strain signal of the crankshaft to the measuring device. In this way, the problem of signal asynchrony caused by using two independent measurement systems to measure the rotation angle and strain of the crankshaft respectively can be avoided.

[0043] In view of this, the inventor has designed a crankshaft angle and strain measurement device, which uses a generator coil and a multi-pole magnet to collect the current angle of the crankshaft, and uses a strain gauge to collect the strain at a specific position of the crankshaft, so as to achieve synchronous collection of the crankshaft angle and strain. After the crankshaft angle and strain signals are collected, they are synchronously transmitted to the signal processing unit and then synchronously transmitted to the measuring device by the signal processing unit, avoiding the problem of signal asynchrony caused by using two independent measurement systems to measure the crankshaft angle and strain respectively.

[0044] Figure 1 A schematic diagram of a portion of the structure of a crankshaft angle and strain measurement device provided in an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of the structure of a crankshaft angle or strain measurement device provided in an embodiment of the present invention; Figure 3 for Figure 2 The middle crankshaft angle is a partial enlarged schematic diagram of the strain measurement device at the multi-polar arc magnetic strip and the receiving antenna; Figure 4 for Figure 2 A partial enlarged schematic diagram of the crankshaft angle, i.e. the strain measurement device at the generating coil and the transmitting antenna; Figure 5 A schematic diagram of a portion of the structure of the crankshaft angle and strain measurement device provided by an embodiment of the present invention from another perspective; Figure 6 A schematic diagram of a portion of the structure of the crankshaft angle and strain measurement device provided by an embodiment of the present invention from another perspective; Figure 7 for Figure 6 A local enlarged schematic diagram of point A in the middle.

[0046] like Figure 1-Figure 7 As shown, the crankshaft 200 angle and strain measurement device provided in this embodiment includes a generator coil 210, a signal processing unit 220, a strain gauge 230 and a multi-level magnet, which is used to measure the current angle of the crankshaft 200 and the strain of the crankshaft 200 at the current angle. The crankshaft angle is the rotation angle value of the crankshaft 200. Taking a four-stroke reciprocating internal combustion engine as an example, the crankshaft 200 rotates 2 circles, that is, 720 degrees, and the internal combustion engine completes a working cycle. The measurement and analysis of the working cycle of the internal combustion engine must be based on the accurate measurement of the crankshaft angle.

[0047] The power generation coil 210 is mounted on the side wall of the crankshaft 200. Schematically, the power generation coil 210 can be fixed to the side wall of the crankshaft 200 by welding or bolting. Those skilled in the art can set the number of turns of the power generation coil 210 and the diameter of the power generation coil 210 according to actual needs, and this embodiment is not limited here. It is easy to understand that when the crankshaft 200 rotates, the power generation coil 210 can be driven to rotate around the rotation axis of the crankshaft 200. The signal processing unit 220 is mounted on the crank arm of the crankshaft 200, wherein the signal processing unit 220 can be mounted at any suitable position on the crank arm. In a possible implementation, the signal processing unit 220 may include a housing and an integrated circuit located inside the housing, and the housing can be fixed to the crank arm of the crankshaft 200 by screws, and the signal is processed using the integrated circuit.

[0048] like Figure 3 As shown, the multipolar magnet surrounds the crankshaft 200 and is spaced apart from the crankshaft 200. For example, the multipolar magnet can be formed into a circular ring structure, and the center of the circular ring structure is located on the rotating axis of the crankshaft 200. The multipolar magnet is spaced apart from the crankshaft 200 to avoid interference between the crankshaft 200 and the multipolar magnet during rotation. The multipolar magnet forms a plurality of magnetic poles 310 at equal angles along the circumference of the crankshaft 200. The magnetic poles 310 include N poles and S poles, and the N poles and S poles are alternately distributed. For example, the plurality of magnetic poles 310 are distributed in a tooth shape along the length direction of the multipolar magnet. Those skilled in the art can set the spacing angle between adjacent magnetic poles 310 according to actual needs, and this embodiment is not limited here. When the crankshaft 200 drives the generator coil 210 to rotate, when the generator coil 210 passes through the multipolar magnet, the generator coil 210 cuts the magnetic lines of force to generate electrical energy. Since the N poles and S poles of the multipolar magnet are alternately distributed, the voltage generated by the generator coil 210 is in the form of alternating pulses.

[0049] The signal processing unit 220 is electrically connected to the generating coil 210. For example, a signal line can be used to connect the conductor and the signal processing unit 220. On the one hand, the generating coil 210 can supply power to the signal processing unit 220 through the signal line; on the other hand, the signal processing unit 220 can convert the alternating pulse voltage input by the generating coil 210 into a crankshaft angle pulse signal. The crankshaft angle pulse signal corresponds to the interval angle between adjacent magnetic poles 310, so that the signal processing unit 220 can obtain the current angle of the crankshaft 200 according to the crankshaft angle pulse signal.

[0050] In one possible implementation, Figure 5-Figure 7As shown, the multipolar magnet is formed into a multipolar arc-shaped magnetic strip 300, that is, the shape of the multipolar magnet is an arc. The multipolar arc-shaped magnetic strip 300 is located below the crankshaft 200 and the center of the multipolar arc-shaped magnetic strip 300 is located on the rotation axis of the crankshaft 200. When the crankshaft 200 drives the power generation coil 210 to rotate around the rotation axis of the crankshaft 200, the motion trajectory of the power generation coil 210 is parallel to the extension direction of the multipolar arc-shaped magnetic strip 300. The multipolar arc-shaped magnetic strip 300 is fixedly connected to the body 100 of the internal combustion engine. Schematically, the two ends of the multipolar arc-shaped magnetic strip 300 can be fixed to the body 100 respectively by fasteners such as screws. The multipolar arc-shaped magnetic strip 300 is a non-full-circular structure, which is convenient for being directly installed on the body 100 from the bottom of the body 100 and coaxial with the crankshaft 200. Those skilled in the art can arrange multiple magnetic poles 310 at equal angles inside an injection mold, inject molten plastic into the injection mold after the multiple magnetic poles 310 are fixed, and demold the injection mold after the molten plastic solidifies to form a multi-polar arc-shaped magnetic strip 300.

[0051] By setting the multi-pole magnet as a multi-pole arc-shaped magnetic strip 300, the multi-pole magnet only needs to be processed into a non-circular arc shape, which is easy to process and can reduce the material cost of the multi-pole magnet. On the other hand, the non-circular multi-pole magnet can be conveniently installed directly on the engine body 100 from the bottom during assembly and coaxial with the crankshaft 200, while avoiding other moving parts inside the internal combustion engine, such as the camshaft.

[0052] Further, there are multiple generating coils 210, and the multiple generating coils 210 are installed at equal angles on the side wall of the crankshaft 200. Specifically, when there are two generating coils 210, the two generating coils 210 are arranged 180 degrees apart, and when there are three generating coils 210, adjacent generating coils 210 are arranged 120 degrees apart. The following takes the setting of two generating coils 210 on the side wall of the crankshaft 200 as an example, but it is not a specific limitation on the protection scope. Those skilled in the art can set the specific number of generating coils 210 according to actual needs.

[0053] like Figure 2As shown, the two generating coils 210 are respectively installed on opposite sides of the crankshaft 200, that is, the two generating coils 210 are distributed at 180 degrees based on the rotation center of the crankshaft 200. The degree of the center angle of the multipolar arc-shaped magnetic strip 300 is greater than the degree of the center angle of the interval between two adjacent generating coils 210. Specifically, when two generating coils 210 are arranged on the side wall of the crankshaft 200, the degree of the center angle of the multipolar arc-shaped magnetic strip 300 is greater than 180 degrees, and the distribution angle of the multiple magnetic poles 310 on the multipolar arc-shaped magnetic strip 300 is greater than 180 degrees. In this way, no matter what angle the crankshaft 200 rotates to, at least one generating coil 210 cuts the magnetic flux lines to generate electrical energy, so that the generating coil 210 can continuously power the signal processing unit 220.

[0054] When a plurality of generating coils 210 are mounted on the side wall of the crankshaft 200, one of the generating coils 210 is mounted on the top of the crankpin of the crankshaft 200, and the other generating coils 210 are distributed at equal angles to the top of the crankpin, for example Figure 2 As shown in FIG, when two power generation coils 210 are installed on the side wall of the crankshaft 200 and the two coils are installed on opposite sides of the crankshaft 200, one of the power generation coils 210 is installed at the crankpin vertex of the crankshaft 200, and the other power generation coil 210 is installed at a position directly opposite to the crankpin vertex. The position of the magnetic pole 310 at the lowest end of the multipolar arc-shaped magnetic strip 300 in the vertical direction is set to be a missing tooth 320, that is, the position of the magnetic pole 310 at the lowest end of the multipolar arc-shaped magnetic strip 300 in the vertical direction is not provided with a magnetic pole 310. Exemplarily, the position of the magnetic pole 310 at the lowest end of the multipolar arc-shaped magnetic strip 300 in the vertical direction is formed as a gap. When the crankshaft 200 rotates and drives the generator coil 210 to pass through the position of the missing tooth 320, the generator coil 210 will produce a lack of electric energy, that is, when the generator coil 210 passes through the position of the missing tooth 320, a missing signal will be generated. The missing signal is used to determine whether the generator coil 210 passes through the lowest point of the multi-polar arc magnetic strip 300, and then the missing signal can be used to determine whether the crankshaft 200 rotates to the bottom dead center or other phase angles.

[0055] by Figure 2For example, when the generator coil 210 at the lower end of the crankshaft 200 passes through the missing tooth 320, the signal processing unit 220 identifies that the crankshaft 200 has rotated to the top dead center; when the generator coil 210 at the upper end of the crankshaft 200, i.e., the generator coil 210 installed at the top of the crankpin, passes through the missing tooth 320, the signal processing unit 220 identifies that the crankshaft 200 has rotated to the bottom dead center. It is easy to understand that when the number of generator coils 210 on the side wall of the crankshaft 200 is greater than two and one of the generator coils 210 is installed at the top of the crankpin of the crankshaft 200, the missing signal generated when the generator coil 210 at the top of the crankpin passes through the missing tooth 320 can determine that the crankshaft 200 has rotated to the bottom dead center, and the missing signals generated when the other generator coils 210 pass through the missing tooth 320 can determine that the crankshaft 200 has rotated to other specific phase angles.

[0056] By setting the position of the lowest pole 310 of the multipolar arc-shaped magnetic strip 300 in the vertical direction to the missing tooth 320, the missing signal generated when the generator coil 210 passes through the missing tooth 320 can be used to identify that the crankshaft 200 rotates to a specific phase angle.

[0057] The strain gauge 230 is disposed on the crankshaft 200, wherein the strain gauge 230 can be fixed on the crankshaft 200 by bonding. Exemplarily, the strain gauge 230 can be pasted on the crankshaft 200, the main journal, or the fillet position between the crankshaft 200 and the main journal. It is easy to understand that the above-mentioned positions are subjected to stress and thus strain occurs during the rotation of the crankshaft 200. Pasting the strain gauge 230 on the above-mentioned position can obtain the strain of the above-mentioned position of the crankshaft 200. The specific structure of the strain gauge 230 is not limited here in this embodiment. Those skilled in the art can select any suitable strain gauge 230 according to actual needs. Of course, the existing strain gauge 230 on the market can also be selected. It is worth mentioning that the strain gauge 230 is electrically connected to the signal processing unit 220, so that the signal processing unit 220 can also obtain the strain of the crankshaft 200 in the area where the strain gauge 230 is pasted.

[0058] In the related art, the number of strain measurements is limited by the number of signal lines and through holes of the slip ring, and the number of strain measurements is relatively small. The crankshaft angle and strain measurement device provided in this embodiment has a non-restrictive number of strain gauges 230, which can be one or more. When the number of strain gauges 230 is multiple, the multiple strain gauges 230 are respectively pasted at different positions on the crankshaft 200. For example, three strain gauges 230 can be set, and the three strain gauges 230 are respectively pasted at the crankshaft 200, the main journal, and the fillet position between the crankshaft 200. The multiple strain gauges 230 are respectively electrically connected to the signal processing unit 220, that is, the signal processing unit 220 can respectively collect the strains at different positions of the crankshaft 200, so that the strain measurement data of the crankshaft 200 is more comprehensive.

[0059] The test device 400 is located outside the body 100 of the internal combustion engine. The test device 400 is connected to the signal processing unit 220 for communication. For example, a signal line can be used to connect the signal processing unit 220 and the test device 400 to achieve mutual communication between the signal processing unit 220 and the test device 400. The test device 400 can display the current rotation angle and strain of the crankshaft 200 according to the rotation angle signal of the crankshaft 200 and the strain signal of the crankshaft 200 transmitted by the signal processing unit 220. The specific structure of the test device 400 is not limited in this embodiment. Those skilled in the art can select any suitable test device 400 according to actual needs. Of course, existing test devices 400 on the market can also be selected.

[0060] It is understood by those skilled in the art that when the crankshaft 200 rotates, the crankshaft angle and strain measuring device simultaneously collects the angle and strain of the crankshaft 200, and the strain signal of the crankshaft 200 and the angle signal of the crankshaft 200 are synchronously transmitted to the signal processing unit 220, and the signal processing unit 220 synchronously transmits the two signals to the test equipment 400, and the test equipment 400 displays the angle and strain of the crankshaft 200. In this way, it is possible to avoid using two test systems to test the strain and angle of the crankshaft 200 separately, thereby solving the problem of the strain signal of the crankshaft 200 and the angle signal of the crankshaft 200 being out of sync.

[0061] like Figure 2As shown, the signal processing unit 220 includes a power generation conditioning module 221 and a signal processing module 222. For example, the power generation conditioning module 221 and the signal processing module 222 are arranged side by side on the crank arm of the crankshaft 200. The input end of the power generation conditioning module 221 is electrically connected to the power generation coil 210. Schematically, the power generation conditioning module 221 can convert the pulse alternating voltage transmitted by the power generation coil 210 into a crankshaft angle pulse signal. The input end of the signal processing module 222 is electrically connected to the output end of the power generation conditioning module 221 and the strain gauge 230 respectively, wherein the power generation conditioning module 221 and the signal processing module 222 can be electrically connected through two signal lines. In a possible implementation, the signal processing module 222 contains a strain test bridge circuit and a signal amplification and storage function. The signal processing module 222 is used to receive the crankshaft angle pulse signal from the power generation conditioning module 221 and the strain signal from the strain gauge 230, and obtain the current angle of the crankshaft 200 and the strain at a specific position. It is worth mentioning that the power generation conditioning module 221 can also condition and store the pulse alternating voltage generated by the power generation coil 210, so that the electric energy generated by the power generation coil 210 can power the signal processing module 222 after passing through the power generation conditioning module 221. The output end of the signal processing module 222 is connected to the test device 400 for communication, that is, the signal processing module 222 can transmit the current rotation angle signal and strain signal of the crankshaft 200 to the test device 400, so that the test device 400 can display the current rotation angle and strain of the crankshaft 200.

[0062] like Figure 2-Figure 4As shown, the crankshaft angle and strain measurement device provided in this embodiment also includes a transmitting antenna 500 and a receiving antenna 600. The transmitting antenna 500 is mounted on the side wall of the crankshaft 200. Schematically, the transmitting antenna 500 can be mounted on the side wall of the crankshaft 200 by fasteners such as screws. The input end of the transmitting antenna 500 is electrically connected to the output end of the signal processing module 222. For example, a signal line can be used to connect the transmitting antenna 500 and the signal processing module 222, so that the signal processing module 222 can transmit the strain signal of the crankshaft 200 and the crankshaft angle signal to the transmitting antenna 500. The receiving antenna 600 is mounted on the body 100. For example, the receiving antenna 600 can be mounted on the body 100 by fasteners. The receiving antenna 600 is connected to the test equipment 400 for communication. It is worth mentioning that the receiving antenna 600 is used to receive the wireless signal transmitted by the transmitting antenna 500. Specifically, the transmitting antenna 500 wirelessly and synchronously outputs the strain signal of the crankshaft 200 and the crankshaft angle signal, i.e., the crankshaft angle pulse signal, and the receiving antenna 600 receives the wireless signal from the transmitting antenna 500 and transmits the strain signal of the crankshaft 200 and the crankshaft angle signal to the testing device 400, thereby realizing synchronous wireless testing of the strain and angle signal of the crankshaft 200. By setting the receiving antenna 600 and the transmitting antenna 500, the wireless transmission of the crankshaft angle signal and the crankshaft 200 strain signal can be realized, and the transmission of the signal will not be limited by the signal line.

[0063] Further, there are multiple transmitting antennas 500, and the multiple transmitting antennas 500 are distributed at equal angles on the side wall of the crankshaft 200. Specifically, when there are two transmitting antennas 500, the two transmitting antennas 500 are arranged 180 degrees apart, and when there are three transmitting antennas 500, adjacent transmitting antennas 500 are arranged 120 degrees apart. The following takes the arrangement of two transmitting antennas 500 on the side wall of the crankshaft 200 as an example, but this is not a specific limitation on the protection scope, and those skilled in the art can set the specific number of transmitting antennas 500 according to actual needs.

[0064] like Figure 2As shown, the two transmitting antennas 500 are respectively located on opposite sides of the crankshaft 200, that is, the two transmitting antennas 500 are distributed at 180 degrees based on the rotation center of the crankshaft 200 and one of the transmitting antennas 500 can be installed at the pin vertex of the crankshaft 200. The receiving antenna 600 is formed as an arc structure surrounding the crankshaft 200, and the center of the arc structure is located on the rotation axis of the crankshaft 200. It is worth mentioning that the degree of the central angle of the receiving antenna 600 is greater than the degree of the central angle of the interval between two adjacent transmitting antennas 500. Specifically, when two transmitting antennas 500 are installed on the side wall of the crankshaft 200 and the two transmitting antennas 500 are distributed at 180 degrees based on the rotation center of the crankshaft 200, the central angle of the receiving antenna 600 is greater than 180 degrees, that is, the extended length of the receiving antenna 600 exceeds a semicircle. Through the above arrangement, when the crankshaft 200 drives the receiving antenna 600 to rotate to any angle, at least one receiving antenna 600 is positioned opposite to the transmitting antenna 500, thereby ensuring that at least one transmitting antenna 500 and the receiving antenna 600 perform wireless signal transmission, ensuring high-speed continuous transmission of the signal.

[0065] like Figure 2 As shown, the crankshaft angle and strain measuring device provided in this embodiment further includes a signal receiving module 700, the input end of the signal receiving module 700 is electrically connected to the output end of the receiving antenna 600, and the output end of the signal receiving module 700 is electrically connected to the test device 400, wherein the signal receiving module 700 can be electrically connected to the test device 400 through a signal line. Exemplarily, an integrated circuit can be used as the signal receiving module 700, and the main body of the signal receiving module 700 can be installed on the side of the receiving antenna 600 away from the crankshaft 200. It is worth mentioning that the signal receiving module 700 can condition the wireless signal received by the receiving antenna 600, so as to condition the wireless signal into a signal suitable for the test device 400, so that the test device 400 can display the angle of the crankshaft 200 and the strain at a specific position of the crankshaft 200 after receiving the signal transmitted by the signal receiving module 700.

[0066] like Figure 3As shown, the receiving antenna 600 is located on the side of the multi-pole magnet away from the crankshaft 200, and the receiving antenna 600 is fixedly connected to the multi-pole magnet. In a possible implementation, the multi-pole magnet and the receiving antenna 600 can be made into an integral part through a one-time molding process. Specifically, the multiple magnetic poles 310 of the multi-pole magnet and the receiving antenna 600 are fixed inside the injection mold, and molten plastic is injected into the injection mold. When the plastic is cooled and solidified, it is demolded from the injection mold to form an arc strip including the receiving antenna 600 and the multi-pole magnet. The fixed connection of the receiving antenna 600 and the multi-pole magnet facilitates the assembly of the receiving antenna 600 and the multi-pole magnet, that is, the arc strip including the receiving antenna 600 and the multi-pole magnet can be directly installed under the crankshaft 200 and fixed to the internal combustion engine body 100, avoiding the separate assembly of the receiving antenna 600 and the multi-pole magnet, and improving the assembly efficiency of the crankshaft angle and strain measurement device.

[0067] In summary, the crankshaft angle and strain measurement device provided in this embodiment can simultaneously collect the angle of the crankshaft 200 and the strain at a specific position of the crankshaft 200. Specifically, the strain of the crankshaft 200 is collected by the strain gauge 230, and the angle of the crankshaft 200 is collected by the generator coil 210 and the multi-pole magnet. The strain signal of the crankshaft 200 and the angle signal of the crankshaft 200 are synchronously transmitted to the signal processing unit 220, and the signal processing unit 220 synchronously transmits the two signals to the test equipment 400, and the test equipment 400 displays the angle and strain of the crankshaft 200. Avoid using two test systems to test the angle and strain of the crankshaft 200 respectively, which causes the two signals to be out of sync.

[0068] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “top”, “bottom”, “upper” and “lower” (if any) are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0069] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0070] The terms "first" and "second" in the specification and claims of the present application and the above-mentioned figure descriptions are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crankshaft angle and strain measurement device, characterized in that: include: A generator coil, wherein the generator coil is mounted on a side wall of the crankshaft; A signal processing unit, wherein the signal processing unit is mounted on a crank arm of the crankshaft and is electrically connected to the generator coil; A strain gauge, wherein the strain gauge is arranged on the crankshaft, and the strain gauge is electrically connected to the signal processing unit; wherein the number of the strain gauges is multiple, and the multiple strain gauges are respectively pasted at different positions on the crankshaft, and the multiple strain gauges are respectively electrically connected to the signal processing unit; A multi-pole magnet, the multi-pole magnet surrounds the crankshaft and is spaced apart from the crankshaft, the multi-pole magnet forms a plurality of magnetic poles at equal angles along the circumference of the crankshaft; the magnetic poles include an N pole and an S pole, the N pole and the S pole are alternately distributed; wherein the multi-pole magnet is formed into a multi-pole arc-shaped magnetic strip, and the multi-pole arc-shaped magnetic strip is a non-circular structure; A test device, the test device is located outside the body of the internal combustion engine, and the test device is communicatively connected with the signal processing unit; The signal processing unit includes a power generation conditioning module and a signal processing module, the input end of the power generation conditioning module is electrically connected to the power generation coil, the input end of the signal processing module is electrically connected to the output end of the power generation conditioning module and the strain gauge respectively, and the output end of the signal processing module is communicatively connected to the test equipment; The multipolar arc-shaped magnetic strip is located below the crankshaft and the center of the multipolar arc-shaped magnetic strip is located on the rotating axis of the crankshaft. The multipolar arc-shaped magnetic strip is fixedly connected to the machine body.

2. The crankshaft angle and strain measuring device according to claim 1, characterized in that: There are multiple generating coils, and the multiple generating coils are installed at equal angles on the side wall of the crankshaft. The degree of the central angle of the multi-polar arc-shaped magnetic strip is greater than the degree of the central angle of the interval between two adjacent generating coils.

3. The crankshaft angle and strain measuring device according to claim 2, characterized in that: One of the generating coils is installed at the top of the crankpin of the crankshaft, and the other generating coils are distributed at equal angles to the top of the crankpin, and the position of the magnetic pole at the lowest end of the multi-polar arc-shaped magnetic strip in the vertical direction is set to be toothless; The generator coil generates a missing signal when passing through the missing tooth, and the missing signal is used to determine whether the crankshaft rotates to the bottom dead center or other phase angles.

4. The crankshaft angle and strain measuring device according to claim 1, characterized in that: It also includes a transmitting antenna and a receiving antenna, wherein the transmitting antenna is installed on the side wall of the crankshaft, and the input end of the transmitting antenna is electrically connected to the output end of the signal processing module; the receiving antenna is installed on the body, and the receiving antenna is communicatively connected to the test equipment, and the receiving antenna is used to receive the wireless signal transmitted by the transmitting antenna.

5. The crankshaft angle and strain measuring device according to claim 4, characterized in that: There are multiple transmitting antennas, and the multiple transmitting antennas are distributed at equal angles on the side wall of the crankshaft; the receiving antenna is formed into an arc structure surrounding the crankshaft, the center of the arc structure is located on the rotation axis of the crankshaft, and the degree of the central angle of the receiving antenna is greater than the degree of the central angle of the interval between two adjacent transmitting antennas.

6. The crankshaft angle and strain measuring device according to claim 4, characterized in that: It also includes a signal receiving module, the input end of the signal receiving module is electrically connected to the output end of the receiving antenna, and the output end of the signal receiving module is electrically connected to the testing device.

7. The crankshaft angle and strain measuring device according to claim 4, characterized in that: The receiving antenna is located at a side of the multi-pole magnet away from the crankshaft, and the receiving antenna is fixedly connected to the multi-pole magnet.

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