Crankshaft stress telemetering device, testing system and testing method

Abstract

The invention discloses a crankshaft stress telemetering device, a testing system and a testing method. The telemetering device is embedded in a crankcase containing a crankshaft and comprises a shell, a high-temperature battery, a wireless transmission module, a signal control processing module and a strain gauge. The shell is fixedly arranged on a crank arm of the crankshaft; the high-temperature battery is arranged in an accommodating cavity formed by the shell; the wireless transmission module and the signal control processing module are both fixedly arranged on the shell, the wireless transmission module is electrically connected with the signal control processing module, and the signal control processing module is electrically connected with the high-temperature battery; the strain gauge is fixedly arranged on the crankshaft and is electrically connected with the signal control processing module; the signal control processing module comprises a mode switching switch used for controlling the telemetering device to be switched between a first mode and a second mode, and the power of the first mode is smaller than that of the second mode. The crankshaft stress telemetering device can work normally in a high-temperature environment, a low-power-consumption power management strategy is adopted, and the service life of the telemetering device after single-time installation is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of internal combustion engines, and in particular to a crankshaft stress telemetry device, a testing system and a testing method. Background Art

[0002] The crankshaft is an important component of the internal combustion engine. Under long-term high-temperature working conditions and periodically changing dynamic loads, the crankshaft will produce alternating bending stress and torsional stress. Whether the crankshaft is reliable directly determines whether the internal combustion engine can work normally. Therefore, whether it is the research and development of new internal combustion engines or the optimization of existing internal combustion engines, the crankshaft strength should be strictly evaluated.

[0003] In harsh environments such as high temperature, the service life of crankshaft monitoring devices is generally not long, and frequent replacement of devices in a high-temperature, sealed crankcase is not realistic. Therefore, an embedded telemetry device that can have a long working life in a high-temperature environment is of great practical significance to the research on crankshaft reliability. Summary of the invention

[0004] The present application discloses a crankshaft stress telemetry device, a test system and a test method. The crankshaft stress telemetry device can test the stress change of the crankshaft in a high temperature environment and has a long service life.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a crankshaft stress telemetry device, the telemetry device being embedded in a crankcase accommodating the crankshaft, the telemetry device comprising a housing, a high-temperature battery, a wireless transmission module, a signal control processing module, and a strain gauge;

[0007] The housing is fixed to the crank arm of the crankshaft;

[0008] The high temperature battery is arranged in the accommodation cavity formed by the shell;

[0009] The wireless transmission module and the signal control processing module are both fixedly mounted on the housing, the wireless transmission module is electrically connected to the signal control processing module, and the signal control processing module is electrically connected to the high temperature battery;

[0010] The strain gauge is fixedly mounted on the crankshaft and is electrically connected to the signal control processing module;

[0011] The signal control processing module includes a mode switching switch for controlling the telemetry device to switch between a first mode and a second mode, wherein the power of the first mode is less than the power of the second mode.

[0012] The above-mentioned crankshaft stress telemetry device is embedded in the crankcase, and the whole adopts high-temperature resistant materials and high-temperature batteries, so that the telemetry device can work normally in a high-temperature environment, and adopts a low-power power management strategy to extend the service life of the telemetry device after a single installation. Specifically, the shell of the telemetry device of the present application is fixed to the crank arm of the crankshaft to avoid causing motion interference to the crankshaft. The high-temperature battery is arranged inside the accommodating cavity formed by the shell, and is used to power various components of the telemetry device, and the use of high-temperature batteries can cope with high-temperature working environments. The wireless transmission module and the signal control processing module are both arranged inside the shell, and the strain gauge is arranged at the stress position of the crankshaft. The signal control processing module is electrically connected to the strain gauge, and is used to receive the strain signal generated by the strain gauge and perform signal processing, and send the processed strain signal to the wireless transmission module electrically connected thereto. The wireless transmission module is used to receive the processed strain signal and transmit the strain signal to an external receiving end to monitor the stress change of the crankshaft. The mode switch of the signal control processing module can control the telemetry device to switch between the first mode and the second mode, wherein when in the first mode, the telemetry device is in a non-working state, and when in the second mode, the telemetry device is in a full-speed working state. The power of the first mode is less than the power of the second mode. This power management strategy can make the telemetry device in a low-power state when not working, which is conducive to extending the use time of the telemetry device after a single installation.

[0013] In some embodiments, the housing has a mounting surface that matches the shape of a crank arm of the crankshaft.

[0014] In some embodiments, the telemetry device further includes a circuit board connected to the high-temperature battery, and the wireless transmission module and the signal control processing module are both fixedly mounted on the circuit board.

[0015] In some embodiments, the telemetry device further includes a switch panel, which is disposed on the housing and electrically connected to the circuit board, and is used to turn on or off the telemetry device.

[0016] In some embodiments, the telemetry device further includes a sealing cover plate, which is disposed on the shell and cooperates with the shell to form a chamber for accommodating the circuit board.

[0017] In a second aspect, the present application provides a crankshaft stress testing system, comprising a terminal device and a crankshaft stress telemetry device as described in the first aspect, wherein the terminal device is signal-connected to a wireless transmission module of the telemetry device.

[0018] In a third aspect, the present application provides a crankshaft stress testing method, comprising:

[0019] The wireless transmission module receives the power-on instruction, and the signal control processing module controls the telemetry device to switch from the first mode to the second mode; the power of the first mode is less than the power of the second mode;

[0020] The wireless transmission module receives the test instruction, the signal control processing module receives the strain signal of the strain gauge, and processes the strain signal and sends it to the wireless transmission module;

[0021] The wireless transmission module receives the processed strain signal and sends it to the terminal device;

[0022] The wireless transmission module receives the power-off instruction, and the signal control processing module controls the telemetry device to switch from the second mode to the first mode.

[0023] In some embodiments, the first mode includes a sleep mode and a wake-up mode that are automatically switched in a cycle, and the first mode includes a first cycle period and a second cycle period, and the first cycle period is greater than the second cycle period; wherein the first cycle period is the time interval for switching from the sleep mode to the wake-up mode, and the second cycle period is the time interval for switching from the wake-up mode to the sleep mode.

[0024] In some embodiments, the first cycle period is 10s-15s.

[0025] In some embodiments, the second cycle period is 0.5s-1s. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of a crankshaft stress telemetry device provided in an embodiment of the present application;

[0027] Figure 2 A schematic flow chart of a crankshaft stress testing method provided in an embodiment of the present application;

[0028] Figure 3 A schematic flow chart of a crankshaft stress testing method provided in an embodiment of the present application;

[0029] Icons: 1. Shell; 2. High-temperature battery; 3. Wireless transmission module; 4. Signal control processing module; 5. Circuit board; 6. Sealing cover; 7. Strain gauge welding panel; 8. Switch panel; 01. First mounting hole; 02. Second mounting hole; 03. Battery line connection mounting hole; 04. Third mounting hole; 05. Panel mounting hole; A. Mounting surface. DETAILED DESCRIPTION

[0030] The following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0032] The crankshaft is an important component of the internal combustion engine, and its crankshaft strength needs to be strictly assessed. At present, the crankshaft monitoring device cannot adapt to high temperature environments, so its service life is generally not long, and the monitoring device can only be replaced frequently. The monitoring device is located in a high-temperature and sealed crankcase, and the replacement operation is complicated, which affects work efficiency. In addition, the monitoring device needs to rely on an independent battery for power supply, and there is currently a lack of a power management strategy to achieve low power consumption.

[0033] Based on the above problems, the present application provides a crankshaft stress telemetry device, a test system and a test method. The crankshaft stress telemetry device can adapt to the high temperature corrosion environment inside the crankcase, realize the wireless test of crankshaft strain, ensure the sampling frequency and test accuracy, and has a simple structure and high reliability. In addition, the present application designs a low-power power management strategy to extend the service life of the telemetry equipment.

[0034] First, as Figure 1 As shown, an embodiment of the present application provides a crankshaft stress telemetry device, which is embedded in a crankcase accommodating a crankshaft, and includes a housing 1, a high-temperature battery 2, a wireless transmission module 3, a signal control processing module 4, and a strain gauge (not shown in the figure);

[0035] The housing 1 is fixed to the crank arm of the crankshaft;

[0036] The high temperature battery 2 is disposed in the accommodation cavity formed by the housing 1;

[0037] The wireless transmission module 3 and the signal control processing module 4 are both fixedly mounted on the housing 1 , the wireless transmission module 3 is electrically connected to the signal control processing module 4 , and the signal control processing module 4 is electrically connected to the high temperature battery 2 ;

[0038] The strain gauge is fixed to the crankshaft and is electrically connected to the signal control processing module 4;

[0039] The signal control processing module 4 includes a mode switching switch for controlling the telemetry device to switch between a first mode and a second mode, wherein the power of the first mode is less than the power of the second mode.

[0040] The above crankshaft stress telemetry device is embedded in the crankcase, and the whole device is made of high temperature resistant material and high temperature battery 2, so that the telemetry device can work normally in a high temperature environment, and when the battery capacity is constant, a low power consumption power management strategy is adopted to extend the service life of the telemetry device after a single installation. Specifically, the housing 1 of the telemetry device of the present application is fixed to the crank arm of the crankshaft through the first mounting hole 01 to avoid motion interference with the crankshaft. The high temperature battery 2 is arranged inside the accommodating cavity formed by the housing 1, and is used to power each module of the telemetry device, and the use of the high temperature battery 2 can cope with the high temperature working environment. The wireless transmission module 3 and the signal control processing module 4 are both arranged inside the housing 1, and the strain gauge is arranged at the stress position of the crankshaft. The signal control processing module 4 is electrically connected to the strain gauge, and is used to receive the strain signal generated by the strain gauge and perform signal processing, and send the processed strain signal to the wireless transmission module 3 electrically connected thereto, and the wireless transmission module 3 is used to receive the processed strain signal and transmit the strain signal to the external receiving end to monitor the stress change of the crankshaft. The mode switch of the signal control processing module 4 can control the telemetry device to switch between the first mode and the second mode, wherein when in the first mode, the telemetry device is in a non-operating state, and when in the second mode, the telemetry device is in a full-speed operating state. The power of the first mode is less than the power of the second mode, and this power management strategy can make the telemetry device in a low-power state when not in operation, which is conducive to extending the use time of the telemetry device after a single installation.

[0041] It should be noted that after the high-temperature battery 2 is placed in the accommodating cavity of the shell 1, a cover plate must be used to seal it to improve the safety of the telemetry device and prevent lubricating oil from entering the structure. The shell 1 of the present application adopts an aluminum structure with a small size and light weight. The high-temperature battery 2 can be a disposable Li / SOCl2 high-temperature battery. The present application arranges the high-temperature battery 2, the wireless transmission module 3, and the signal control processing module 4 in the shell 1 to facilitate the installation and fixation of the telemetry device.

[0042] The wireless transmission module 3 of the present application can be a radio frequency (RF) transmission module, and the signal control processing module 4 is mainly composed of an A / D converter (full name analog to digital converter (ADC)) and a microcontroller unit (MCU). The A / D converter is a 12-bit successive approximation type serial, and data acquisition is coordinated and carried out by the MCU controller. The MCU is mainly used to realize the control of the A / D converter and the wireless transmission module 3, and the internal control functions realized also include: power management, control of electrically erasable programmable read only memory (EEPROM), etc.

[0043] The embodiment of the present application uses a 120Ω strain gauge as a strain sensor. The strain gauge output adaptation circuit is a Wheatstone bridge, which converts the resistance change of the strain gauge into a voltage change, and then performs impedance transformation and signal amplification through a high-impedance differential amplifier circuit. Subsequently, it is conditioned by the signal conditioning circuit, that is, the output signal of the Wheatstone bridge is amplified by an instrument amplifier, and after the bias voltage is applied by an external low-impedance voltage follower, it is output to the subsequent second-order low-pass filter circuit to realize the collection and preliminary processing of the strain signal. The gain of the signal conditioning circuit is 80 times, and the low-pass cutoff frequency is 1kHz.

[0044] In some embodiments, the housing 1 has a mounting surface A that matches the outer shape of a crank arm of a crankshaft.

[0045] One possible implementation method is Figure 1 As shown, the mounting surface A adopts a conformal design, that is, it matches the shape of the crank arm, which can ensure that the telemetry device can be better fixed on the crank arm under the condition of high-speed rotation of the crankshaft, thereby improving the structural stability and installation firmness of the telemetry device. It should be noted that the mounting surface A of the housing 1 can be an arcuate surface or a plane that matches the outer contour of the crank arm, and the specific shape is set according to the shape of the crank arm.

[0046] In some embodiments, the telemetry device further includes a circuit board 5 connected to the high-temperature battery 2 , and the wireless transmission module 3 and the signal control processing module 4 are both fixedly mounted on the circuit board 5 .

[0047] One possible implementation method is Figure 1As shown, the circuit board 5 is fixed inside the shell 1 through the second mounting hole 02, so as to ensure that the shell 1 protects the circuit board 5 during the high-speed operation of the crankshaft, improve the structural stability of the telemetry equipment and the accuracy of signal processing and transmission, and thus increase the service life. The high-temperature battery 2 is electrically connected to the circuit board 5 through the battery line connection mounting hole 03 to supply power to the circuit board 5. It should be noted that the circuit board 5 is made of high-temperature resistant material so that the telemetry device can be used in a high-temperature environment, thereby improving the universal adaptability of the device. The telemetry device of the present application can be used under high temperature conditions of about 150°C. It can be understood that in addition to the wireless transmission module 3 and the signal control processing module 4, the circuit board 5 is also provided with other functional modules to complete the collection of crankshaft information by the telemetry device.

[0048] It should be noted that the circuit board 5 adopts an integrated circuit design, integrating analog circuits and digital circuits on a printed circuit board (PCB).

[0049] In some embodiments, the telemetry device further includes a sealing cover plate 6 , which is disposed on the housing 1 and cooperates with the housing 1 to form a chamber for accommodating the circuit board 5 .

[0050] One possible implementation method is Figure 1 As shown, the sealing cover plate 6 is fixed to the surface of the housing 1 through the third mounting hole 04, and the circuit board 5 is located in the chamber formed by the sealing cover plate 6 and the housing 1, which can prevent high-temperature lubricating oil from entering the housing 1 and avoid damaging the circuit board 5, which is beneficial to improving the service life of the telemetry device. Exemplarily, the sealing cover plate 6 can be an epoxy resin cover plate.

[0051] It should be noted that a strain gauge welding panel 7 is also provided on the sealing cover plate 6, and the strain gauge welding panel 7 is exposed on the surface of the sealing cover plate 6. The signal line connected to the strain gauge is welded to the strain gauge welding panel 7, and the strain gauge is electrically connected to the circuit board 5 through the strain gauge welding panel 7 to realize strain signal transmission. It is understandable that during the test, it is necessary to use a sealant to seal the surface of the strain gauge welding panel 7 to prevent high-temperature lubricating oil from entering the interior of the housing 1 and to avoid damage to the welding position, thereby affecting the measurement results. In addition, an adjustable resistor is also provided on the surface of the sealing cover plate 6 to condition the strain signal.

[0052] In some embodiments, the remote sensing device further includes a switch panel 8 , which is disposed on the housing 1 and electrically connected to the circuit board 5 , and is used to turn on or off the remote sensing device.

[0053] One possible implementation method is Figure 1As shown, the switch panel 8 is installed on the housing through the panel mounting hole 05 and is electrically connected to the circuit board 5. The switch panel 8 is used to turn the telemetry device on or off before and after use to reduce the power consumption of the telemetry device and increase the service life of the device. It should be noted that before the telemetry device is installed in the crankcase for use, it has been in a closed state. At this time, the telemetry device is in a low power consumption state, and the power consumption is at the μA level. When the telemetry device is installed in the crankcase and before the final cover is closed, it is turned on. At this time, the telemetry device is in the first mode and waits for instructions from the external device. Its average current is at the mA level. The setting of the switch panel 8 can minimize the power consumption of the telemetry device during the entire assembly and waiting process, which is beneficial to extend the service life of the telemetry device after a single installation.

[0054] In a second aspect, an embodiment of the present application provides a crankshaft stress testing system, comprising a terminal device and a crankshaft stress telemetry device as in the first aspect, wherein the terminal device is connected to a wireless transmission module signal of the telemetry device. The terminal device is used to send instructions to the telemetry device and receive strain signals to monitor the changes in crankshaft stress.

[0055] The wireless communication system in the crankshaft stress test system of the embodiment of the present application includes two parts: a wireless transmission module of the telemetry device and a wireless transmission module connected to the terminal device. The two wireless transmission modules have the same structure and are used to complete operations such as encoding / decoding, modulation / demodulation of instructions / data, and specifically realize the mutual conversion between baseband signals and radio frequency signals. The output of the wireless transmission module adopts a differential structure, and a resonant circuit (Logic Circuit, LC) matching network is required for balanced-unbalanced transformation.

[0056] It should be noted that in order to solve the problem of the harsh communication environment inside the crankcase, the present application adopts the following anti-interference and environmental adaptability design measures:

[0057] ①Using unique enhanced burst transmission (ShockBurst) technology to improve the anti-interference level, the system automatically generates a pilot code and a cyclic redundancy check code (Cyclic Redundancy Check, CRC), and cooperates with automatic response and automatic retransmission (AutomaticRepeatreQuest, ARQ) functions to ensure reliable communication;

[0058] ② With the help of the dipstick channel, the external antenna is inserted into the crankcase to avoid excessive attenuation of the signal due to the shielding of the case, thereby ensuring the signal strength in a closed environment and improving environmental adaptability.

[0059] Thirdly, Figure 2 As shown, the embodiment of the present application provides a crankshaft stress testing method, comprising the following steps:

[0060] S201, the wireless transmission module receives a power-on instruction, and the signal control processing module controls the telemetry device to switch from the first mode to the second mode; the power of the first mode is less than the power of the second mode;

[0061] S202, the wireless transmission module receives the test instruction, the signal control processing module receives the strain signal of the strain gauge, and processes the strain signal and sends it to the wireless transmission module;

[0062] S203, the wireless transmission module receives the processed strain signal and sends it to the terminal device;

[0063] S204: The wireless transmission module receives the power-off instruction, and the signal control processing module controls the telemetry device to switch from the second mode to the first mode.

[0064] It should be noted that before executing step S201, the crankshaft needs to be placed in the crankcase of the internal combustion engine, and then the telemetry device needs to be installed on the crankshaft. After the installation of other parts is completed, before the cover is closed, the switch panel needs to be operated to turn on the telemetry device. At this time, the telemetry device is in the first mode, that is, a non-working state with low power consumption.

[0065] In some embodiments, the first mode includes a sleep mode and a wake-up mode that are automatically switched in a cycle, and the first mode includes a first cycle period and a second cycle period, and the first cycle period is greater than the second cycle period; wherein the first cycle period is the time interval for switching from the sleep mode to the wake-up mode, and the second cycle period is the time interval for switching from the wake-up mode to the sleep mode.

[0066] It should be noted that when in the sleep mode of the first mode, only the signal control processing module on the circuit board works, and when in the wake-up mode of the first mode, only the wireless transmission module and the signal control processing module on the circuit board work. When the telemetry device is in the wake-up mode, if the wireless transmission module does not receive the power-on instruction of the external terminal device, the signal control processing module will control the telemetry device to continue to switch to the sleep mode; if the wireless transmission module receives the power-on instruction of the external terminal device, the signal control processing module will control all functional modules to be in the working mode, that is, the telemetry device switches to the second mode. Under the conditions of the second mode, the wireless transmission module continues to receive the test instructions of the external terminal device, and then performs the crankshaft stress test. After the test is completed, the external terminal device will send a power-off instruction to the wireless transmission module. After the wireless transmission module receives the instruction, the telemetry device switches from the second mode to the first mode. In this way, the monitoring of the crankshaft stress change is completed.

[0067] In some embodiments, the first cycle period is 10s-15s, for example, 10s, 11s, 12s, 13s, 14s, 15s, etc. The second cycle period is 0.5s-1s, for example, 0.5s, 0.6s, 0.7s, 0.8s, 0.9s, 1s, etc. The time of the first cycle period is much longer than the time of the second cycle period. Such a setting can reduce the power consumption of the telemetry device as much as possible, which is conducive to extending the service life of the device.

[0068] In order to make the solution provided in the embodiment of the present application easier to understand, the crankshaft stress testing method is described in detail below through a specific embodiment. Figure 3 As shown, the process includes the following steps:

[0069] S301, turning on the telemetry device through the switch panel;

[0070] S302, when the telemetry device is in the wake-up mode of the first mode, the signal control processing module controls the wireless transmission module to receive a power-on instruction of the terminal device;

[0071] S303, the signal control processing module determines whether the wireless transmission module receives the power-on instruction of the terminal device; if so, execute S304, if not, execute S308;

[0072] S304, the signal control processing module controls the telemetry device to switch from the first mode to the second mode;

[0073] S305, the wireless transmission module receives the test instruction of the terminal device, the signal control processing module receives the strain signal of the strain gauge, and processes the strain signal and sends it to the wireless transmission module;

[0074] S306, the wireless transmission module receives the processed strain signal and sends it to the terminal device;

[0075] S307, the wireless transmission module receives the power-off instruction of the terminal device, and the signal control processing module controls the telemetry device to switch from the second mode to the first mode, and continues to execute S302;

[0076] S308. The signal control processing module controls the telemetry device to switch from the wake-up mode to the sleep mode, and performs automatic cyclic switching between the sleep mode and the wake-up mode, and continues to execute S302.

[0077] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A crankshaft stress remote sensing device, characterized in that: The telemetry device is embedded in a crankcase accommodating the crankshaft, and the telemetry device includes a housing, a high-temperature battery, a wireless transmission module, a signal control processing module, and a strain gauge; The housing is fixed to the crank arm of the crankshaft; The high temperature battery is arranged in the accommodation cavity formed by the shell; The wireless transmission module and the signal control processing module are both fixedly mounted on the housing, the wireless transmission module is electrically connected to the signal control processing module, and the signal control processing module is electrically connected to the high temperature battery; The strain gauge is fixedly mounted on the crankshaft and is electrically connected to the signal control processing module; The signal control processing module includes a mode switching switch for controlling the telemetry device to switch between a first mode and a second mode, wherein the power of the first mode is less than the power of the second mode.

2. The crankshaft stress remote sensing device according to claim 1, characterized in that: The housing has a mounting surface that matches the shape of a crank arm of the crankshaft.

3. The crankshaft stress remote sensing device according to claim 2, characterized in that: The telemetry device further comprises a circuit board connected to the high-temperature battery, and the wireless transmission module and the signal control processing module are both fixedly mounted on the circuit board.

4. The crankshaft stress remote sensing device according to claim 3, characterized in that: The remote sensing device further comprises a switch panel, which is disposed on the housing and electrically connected to the circuit board and is used to turn on or off the remote sensing device.

5. The crankshaft stress remote sensing device according to claim 4, characterized in that: The remote sensing device further comprises a sealing cover plate, which is disposed on the housing and cooperates with the housing to form a chamber for accommodating the circuit board.

6. A crankshaft stress testing system, characterized in that: It comprises a terminal device and a crankshaft stress telemetry device as described in any one of claims 1 to 5, wherein the terminal device is signal-connected to a wireless transmission module of the telemetry device.

7. A crankshaft stress testing method, characterized in that: include: The wireless transmission module receives the power-on instruction, and the signal control processing module controls the telemetry device to switch from the first mode to the second mode; the power of the first mode is less than the power of the second mode; The wireless transmission module receives the test instruction, the signal control processing module receives the strain signal of the strain gauge, and processes the strain signal and sends it to the wireless transmission module; The wireless transmission module receives the processed strain signal and sends it to the terminal device; The wireless transmission module receives the power-off instruction, and the signal control processing module controls the telemetry device to switch from the second mode to the first mode.

8. The crankshaft stress testing method according to claim 7, characterized in that: The first mode includes a sleep mode and a wake-up mode that are automatically switched in a cycle, and the first mode includes a first cycle period and a second cycle period, and the first cycle period is greater than the second cycle period; wherein the first cycle period is the time interval for switching from the sleep mode to the wake-up mode, and the second cycle period is the time interval for switching from the wake-up mode to the sleep mode.

9. The crankshaft stress testing method according to claim 8, characterized in that: The first cycle period is 10s-15s.

10. The crankshaft stress testing method according to claim 8, characterized in that: The second cycle period is 0.5s-1s.

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