Clutch temperature wireless measurement device and test system

Abstract

The invention belongs to the technical field of clutch detection, and particularly relates to a clutch temperature wireless measurement device and a test system, the device comprises an upper computer assembly fixed on a box body of a clutch and a temperature telemetering assembly fixed on a cylinder sleeve of the clutch, and a temperature detection end of the temperature telemetering assembly is installed on a dual steel sheet of the clutch; the temperature telemetering assembly is used for detecting the friction heat generation temperature between the dual steel sheet and the friction sheet; the upper computer assembly supplies energy to the temperature telemetering assembly in a wireless power supply mode. The upper computer assembly is in signal connection with the temperature telemetering assembly. The invention further discloses a test system and an intelligent early warning system which are applied to the device. Compared with the traditional wired temperature measurement, the device can realize the actual measurement of the rotating friction pair, and can effectively implement the thermal load control according to the measured data.

Description

Technical Field

[0001] The present invention belongs to the technical field of clutch detection, and in particular relates to a clutch temperature wireless measuring device and a test system. Background Art

[0002] Wet clutches are essential components for power transmission in various fields and are widely used in transmissions for construction machinery, agricultural and forestry machinery, mining equipment, ships, specialized vehicles, civilian vehicles, and even helicopters. However, under prolonged, high-load operation or improper use, wet clutches can overheat, leading to performance degradation and increased wear, significantly reducing the wet clutch's operating performance and service life, and even impacting the safety and reliability of the vehicle. Consequently, numerous researchers, both domestically and internationally, have conducted extensive research on clutch temperature field changes to address the effects of high temperatures on wet clutches.

[0003] However, in the current research, it is completely impossible to measure the rotating friction pair of the clutch in the actual vehicle. Due to the use of wired temperature measurement, the clutch can only maintain the rotation of the active part and it is difficult to achieve the rotation of the passive part. Therefore, only the braking condition can be detected, and the actual measurement of the rotating friction pair cannot be achieved, so that the thermal load control cannot be effectively implemented, which affects the gear shifting operation.

[0004] Therefore, there is an urgent need for a wireless clutch temperature measurement device and test system to solve the problem. Summary of the Invention

[0005] The object of the present invention is to provide a clutch temperature wireless measuring device and a test system to solve the above problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A clutch temperature wireless measuring device, comprising:

[0008] A host computer component fixed on the clutch housing and a temperature telemetry component fixed on the cylinder sleeve of the clutch, wherein the temperature detection end of the temperature telemetry component is installed on the dual steel plate of the clutch;

[0009] The temperature telemetry assembly is used to detect the frictional heat temperature between the dual steel plate and the friction plate;

[0010] The host computer component supplies energy to the temperature telemetry component through wireless power supply;

[0011] The host computer component is signal-connected to the temperature telemetry component.

[0012] Optionally, the host computer component includes:

[0013] The upper computer platform is fixed to the box;

[0014] The host computer side circuit board is coaxially fixed on the host computer side platform;

[0015] The host computer circuit board is provided with an energy sending module, a second data processing chip and a second wireless data transmission module.

[0016] Optionally, the temperature remote sensing component includes:

[0017] A collection end platform, coaxially fixed to the cylinder sleeve;

[0018] The acquisition end circuit board is coaxially fixed to the acquisition end platform. The acquisition end platform is provided with a wireless data transmission module 1, a data processing chip 1 and an energy receiving module. The wireless data transmission module 1 is signal-connected to the data processing chip 2, and the energy sending module is electrically connected to the energy receiving module.

[0019] The collection end circuit board is electrically connected to a plurality of temperature detection components, and the temperature detection components are arranged on corresponding dual steel sheets.

[0020] Optionally, two temperature detection components are provided on any of the dual steel sheets, and the angle between the two temperature detection components is 80°.

[0021] Optionally, the temperature detection component includes two temperature detection parts, which are symmetrically arranged, and the angle between the line connecting the two temperature detection parts of any temperature detection component and the line connecting the two temperature detection parts of another temperature detection component is 80°.

[0022] Optionally, the temperature detection unit includes three thermocouples, which are arranged in sequence from the inside to the outside along the diameter direction of the dual steel sheets, and the thermocouples are electrically connected to the collection end circuit board.

[0023] Optionally, a plurality of temperature measurement channels are provided on the acquisition end circuit board, and the plurality of temperature measurement channels are arranged at equal intervals around the circumference. The temperature measurement channels are used to be electrically connected to the thermocouple, and the temperature measurement channels are electrically connected to the data processing chip.

[0024] Optionally, an acrylic support frame is fixedly connected to the upper computer platform, and the acrylic support frame is fixedly connected to the box body;

[0025] The upper machine end platform is fixedly connected to the oil distribution sleeve of the clutch;

[0026] The cylinder sleeve rotates coaxially with the sleeve of the clutch. The sleeve is coaxially sleeved on the inner side of the cylinder sleeve. The box body is fixedly connected to the sleeve.

[0027] A test system for studying clutch temperature field and friction pair temperature changes, using the above-mentioned clutch temperature wireless measurement device, includes:

[0028] A clutch test bench is used to place a clutch, and the clutch temperature wireless measuring device is installed in the clutch;

[0029] a driving motor axially connected to the input shaft of the clutch;

[0030] A load motor is connected to the output shaft of the clutch, and a brake is provided between the load motor and the output shaft;

[0031] a lubrication system connected to the clutch and used for lubricating the clutch;

[0032] a cooling device connected to the lubrication system and used for cooling the lubricating oil in the lubrication system;

[0033] a data acquisition and analysis device, electrically connected to the lubrication system, the cooling device, the drive motor, the load motor, and the brake;

[0034] The data acquisition and analysis device is electrically connected to the host computer component.

[0035] Optionally, also include:

[0036] A wireless power supply efficiency evaluation module, used for monitoring the efficiency of wireless power supply between the host computer component and the temperature telemetry component;

[0037] A temperature evaluation module is used to determine the clutch operating state and the clutch temperature level based on the temperature data obtained by the temperature telemetry component.

[0038] Compared with the prior art, the present invention has the following advantages and technical effects:

[0039] When in use, the upper computer component of this device supplies energy to the temperature telemetry component through wireless power supply, and the temperature telemetry component is used to detect the friction heat temperature between the dual steel plates and the friction plates. The upper computer component and the temperature telemetry component are connected by wireless signals to realize the collection of temperature data. Compared with the traditional wired temperature measurement, this device can realize the actual measurement of the rotating friction pair and can effectively implement thermal load control based on the measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0041] Figure 1 Schematic diagram of the clutch structure of the present invention;

[0042] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A;

[0043] Figure 3 This is a structural diagram of the circuit board of the acquisition end of the present invention;

[0044] Figure 4 This is a structural diagram of the host computer circuit board of the present invention;

[0045] Figure 5 This is the temperature zone division diagram of the dual steel sheet of the present invention;

[0046] Figure 6 Schematic diagram of the thermocouple position of the present invention Figure 1 ;

[0047] Figure 7 Schematic diagram of the thermocouple position of the present invention Figure 2 ;

[0048] Figure 8 Schematic diagram of the test system structure of the present invention;

[0049] Figure 9 Schematic diagram of the working process of the test system of the present invention;

[0050] Figure 10 This is a schematic diagram of the working process of the wireless transmission module of the present invention;

[0051] Figure 11 This is a schematic diagram of the working process of the wireless energy module of the present invention;

[0052] Figure 12 This is a schematic diagram of the wireless energy supply efficiency determination process of the present invention;

[0053] Figure 13 Schematic diagram of the filtering process of the present invention;

[0054] Figure 14 This is a schematic diagram of the timestamp alignment process of the present invention;

[0055] Figure 15 Schematic diagram of the channel data comparison and verification process of the present invention;

[0056] Figure 16 This is a schematic diagram of the temperature evaluation process of the present invention;

[0057] Figure 17 This is a test flow chart of the present invention;

[0058] Figure 18 This is a comparison chart of wired temperature measurement and wireless temperature measurement under 300 r / min working condition with piston pressure of 0.3 MPa in the present invention;

[0059] Figure 19 This is a comparison chart of wired temperature measurement and wireless temperature measurement under 400 r / min working conditions with a piston pressure of 0.3 MPa according to the present invention;

[0060] Figure 20 This is a comparison chart of wired temperature measurement and wireless temperature measurement under 500 r / min working conditions with a piston pressure of 0.3 MPa according to the present invention;

[0061] Figure 21 For the present invention Figures 18 to 20 Data summary chart;

[0062] Among them, 1. Box; 2. Input shaft; 3. Output shaft; 4. Sleeve; 5. Oil distribution sleeve; 6. Cylinder liner; 7. Acquisition end platform; 8. Acquisition end circuit board; 9. Upper computer end circuit board; 10. Upper computer end platform; 11. Acrylic support frame; 12. Energy receiving module; 13. Wireless data transmission module 1; 14. Data processing chip 1; 15. Temperature measurement channel; 16. Thermocouple; 17. Energy sending module; 18. Data processing chip 2; 19. Wireless data transmission module 2. DETAILED DESCRIPTION

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0064] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0065] Reference Figures 1 to 21 The present invention discloses a wireless clutch temperature measuring device, comprising:

[0066] The upper computer component is fixed on the clutch housing 1 and the temperature telemetry component is fixed on the clutch cylinder sleeve 6. The temperature detection end of the temperature telemetry component is installed on the dual steel plate of the clutch;

[0067] The temperature telemetry component is used to detect the frictional heat temperature between the dual steel plate and the friction plate;

[0068] The host computer component supplies energy to the temperature telemetry component through wireless power supply;

[0069] The host computer component is connected to the temperature telemetry component signal.

[0070] When in use, the upper computer component of this device supplies energy to the temperature telemetry component through wireless power supply, and the temperature telemetry component is used to detect the friction heat temperature between the dual steel plates and the friction plates. The upper computer component and the temperature telemetry component are connected by wireless signals to realize the collection of temperature data. Compared with the traditional wired temperature measurement, this device can realize the actual measurement of the rotating friction pair and can effectively implement thermal load control based on the measurement data.

[0071] As an optional implementation, the host computer component includes:

[0072] The upper computer platform 10 is fixed to the box 1;

[0073] The host computer circuit board 9 is coaxially fixed on the host computer platform 10;

[0074] The host computer circuit board 9 is provided with an energy sending module 17 , a second data processing chip 18 and a second wireless data transmission module 19 .

[0075] As an optional embodiment, the temperature remote sensing component includes:

[0076] The collecting end platform 7 is coaxially fixed to the cylinder sleeve 6;

[0077] The collection end circuit board 8 is coaxially fixed to the collection end platform 7. The collection end platform 7 is provided with a wireless data transmission module 13, a data processing chip 14 and an energy receiving module 12. The wireless data transmission module 13 is signal-connected to the data processing chip 2 18, and the energy sending module 17 is electrically connected to the energy receiving module 12.

[0078] The collection end circuit board 8 is electrically connected to a plurality of temperature detection components, and the temperature detection components are arranged on the corresponding dual steel sheets.

[0079] As an optional implementation, two temperature detection components are provided on any pair of steel sheets, and the angle between the two temperature detection components is 80°.

[0080] As an optional embodiment, the temperature detection component includes two temperature detection parts, which are symmetrically arranged, and the angle between the line connecting the two temperature detection parts of any temperature detection component and the line connecting the two temperature detection parts of the other temperature detection component is 80°.

[0081] As an optional embodiment, the temperature detection unit includes three thermocouples 16, which are arranged in sequence from the inside to the outside along the diameter direction of the dual steel sheets. The thermocouples 16 are electrically connected to the collection end circuit board 8.

[0082] As an optional embodiment, a plurality of temperature measurement channels 15 are provided on the collection end circuit board 8, and the plurality of temperature measurement channels 15 are arranged at equal intervals around the circumference. The temperature measurement channels 15 are used to be electrically connected to the thermocouple 16, and the temperature measurement channels 15 are electrically connected to the data processing chip 14.

[0083] As an optional embodiment, an acrylic support frame 11 is fixedly connected to the upper machine platform 10, and the acrylic support frame 11 is fixedly connected to the box 1;

[0084] The upper machine platform 10 is fixedly connected to the oil distribution sleeve 5 of the clutch;

[0085] The cylinder sleeve 6 rotates coaxially with the sleeve 4 of the clutch. The sleeve 4 is coaxially sleeved on the inner side of the cylinder sleeve 6 . The housing 1 and the sleeve 4 are fixedly connected.

[0086] This device mainly includes a temperature telemetry component and a host computer component.

[0087] The energy receiving module 12, wireless data transmission module 13, and data processing chip 14 of the temperature telemetry component are all integrated on the acquisition end circuit board 8. The acquisition end circuit board 8 is mounted on the acquisition end platform 7. The acquisition end platform 7 is fixed to one side of the support plane of the cylinder sleeve 6 through aerogel;

[0088] The host computer components' energy transmission module 17, data processing chip 2 18, and wireless data transmission module 2 19 are all integrated on the host computer circuit board 9. The host computer circuit board 9 is mounted on the host computer platform 10, which is fixed to the acrylic support frame 11 via aerogel, and the acrylic support frame 11 is fixed to the box 1 via aerogel.

[0089] To meet the requirements of wireless communication, the distance between the host computer circuit board 9 and the acquisition end circuit board 8 is between 15 and 25 mm.

[0090] The wet clutch is secured by the combined action of the oil distribution sleeve 5 and sleeve 4. The outer side of the cylinder liner 6 contacts the oil distribution sleeve 5, providing support for the clutch. The steel plate inside the cylinder liner 6 contacts the sleeve 4, providing support for the clutch. During power transmission, the drive motor drives the input shaft to transfer power to the friction plate inside the clutch, driving the clutch friction plate to rotate. The friction plate and the steel plate slide against each other, driving the steel plate to rotate, which in turn drives the cylinder liner 6. The cylinder liner 6 then drives the output shaft 3 to rotate, achieving power output. During the experiment, a load motor was used to drive the output shaft 3 to accelerate the synchronization process.

[0091] The collection end circuit board 8 includes an energy receiving module 12 , a wireless data transmission module 13 , a data processing chip 14 and a plurality of temperature measurement channels 15 .

[0092] In order to ensure that the thermocouple 16 remains fixed during the measurement process, aerogel is used to fix the intersection of the thermocouple 16 and the measuring point on the steel sheet.

[0093] In order to fully install various devices on the circuit board, the outer diameter of the acquisition end circuit board 8 and the host computer end circuit board 9 is designed to be slightly larger than the outer diameter of the cylinder sleeve 6.

[0094] Clutch temperature collection points such as Figure 3 As shown, four symmetrical points (①②③④) on the clutch steel plate can be collected, and OD (r=120mm), MD (r=105mm), and ID (r=90mm) can be collected respectively.

[0095] In order to reduce the interference between the thermocouples 16 when measuring the temperature of multiple rotating friction pairs, the temperature measurement channel 15 adopts a 32-bit equidirectional arrangement design and is designed as follows: Figure 4 The test method shown collects the temperature conditions of three rotating friction pairs: the temperature collection channel is divided into two-point collection channels on the left, two-point collection channels on the right, and two-point collection channels on the bottom, and data is collected from different parts of the three rotating friction pairs respectively. Only two points of one rotating friction pair are collected for comparison.

[0096] The two left-side acquisition channels collect six sets of data from points ① and ③; the two right-side acquisition channels collect six sets of data from points ② and ④; and the two lower-side acquisition channels collect six sets of data from points ③ and ④. During temperature acquisition, the redundant temperature acquisition channels serve as backup.

[0097] The host computer circuit board 9 includes an energy sending module 17 , a second data processing chip 18 , and a second wireless data transmission module 19 .

[0098] In the above device, the clutch and the upper computer component are fixedly connected in the box 1, and the temperature telemetry component is fixedly connected to the cylinder sleeve 6 of the clutch; the energy sending module 17, data processing chip 2 18, and wireless data transmission module 2 19 of the upper computer component are integrated into one piece; the energy receiving module 12, wireless data transmission module 1 13, data processing chip 1 14, and temperature measurement channel 15 of the temperature telemetry component are integrated into one piece.

[0099] During the data transmission process, the temperature telemetry component collects clutch temperature data through the thermocouple 16 during system operation and transmits the data to the data processing chip 14. The data processing chip 14 transmits the temperature data processed by this module to the wireless data transmission module 19 of the upper computer component in the form of a wireless signal through the wireless data transmission module 13. The data processing chip 2 18 of the upper computer component obtains the data and processes the completed data for transmission to the host.

[0100] During the energy transmission process, the host provides energy to the upper computer component, and the data processing chip 2 18 of the upper computer component manages the output of energy, and realizes the energy output to the energy receiving module 12 through the energy sending module 17 to supply energy to the wireless data transmission module 13, the data processing chip 1 14, and the thermocouple 16.

[0101] The energy transmission module 17 is also provided with a wireless power supply efficiency evaluation program, which is used to meet the use requirements of the temperature acquisition system during the energy transmission process.

[0102] In order to meet the use requirements of the temperature acquisition system, the power transmission efficiency of the wireless energy supply module used in this patent is greater than η min The specific parameters of the designed coil are as follows: coil radius r = 0.1m, the distance between the two coils d = 0.02m, and the cross-sectional area of ​​the wire A = 3.14×10 -6 m 2 , the number of turns of the transmitting coil and the receiving coil is N = 8 turns, the air magnetic flux μ = 4π×10-7H / m, the resistivity of copper ρ = 1.724×10-8Ω*m, which can achieve the maximum transmission efficiency of η max .

[0103] However, due to the influence of high-intensity vibration, high temperature, oil pollution, and magnetic field, during the actual energy supply process, the coil is likely to have a significantly reduced energy transmission efficiency, thereby causing electronic components to malfunction.

[0104] In order to realize the detection of transmission power, a wireless power supply early warning mechanism is designed.

[0105] (1) Data reading: When the electronic components at the acquisition end are working, the voltage of the power pin of the microcontroller processor is a fixed value, and the input current of the tube is detected in real time.

[0106] (2) Data calculation: The data is fed back to the processor through the current sensor, and the efficiency calculated is compared with the reference minimum efficiency.

[0107] (3) Transmission efficiency judgment: Propose three power transmission stages and comparative efficiency formulas To evaluate the transmission power, the above process continues during the high-efficiency transmission phase, reading the voltage pin current. During the critical transmission warning phase, the acquisition terminal buzzer is activated to warn. At this time, the experimental bench is checked, subsequent experiments are stopped, and the energy transmission coil is adjusted to ensure stable energy transmission. During the low-efficiency transmission phase, the buzzer alarm frequency is increased, and the LED light flashes more frequently.

[0108] The values ​​of each evaluation condition are shown in the table below.

[0109] Table 1: Wireless power transmission efficiency evaluation and adjustment table

[0110]

[0111] A test system for studying clutch temperature field and friction pair temperature changes, using the above-mentioned clutch temperature wireless measurement device, includes:

[0112] Clutch test bench, used to place the clutch, with the clutch temperature wireless measurement device installed inside the clutch;

[0113] The driving motor is connected to the input shaft 2 of the clutch;

[0114] The load motor is connected to the output shaft 3 of the clutch, and a brake is provided between the load motor and the output shaft 3;

[0115] A lubrication system, connected to the clutch, for clutch lubrication;

[0116] A cooling device, connected to the lubrication system, for cooling the lubricating oil in the lubrication system;

[0117] The data acquisition and analysis device is electrically connected to the lubrication system, the cooling device, the drive motor, the load motor, and the brake;

[0118] The data acquisition and analysis device is electrically connected to the host computer component.

[0119] The overall architecture of this test system mainly includes: drive motor, brake, load motor, clutch test bench, cooling device, lubrication system, and host computer data acquisition and analysis device.

[0120] The host computer data acquisition and analysis device is connected to the host computer component via a data line.

[0121] The loading motor, lubrication system, load motor, temperature telemetry system, and brake are all connected to the clutch test bench. The loading motor, lubrication system, and load motor are all connected to the host computer data acquisition and analysis device to control the device or collect temperature data.

[0122] The clutch is placed on the clutch test bench.

[0123] The active end of the clutch, i.e. the input shaft 2 and the friction plate fixed on the input shaft 2, are connected to the drive motor through a coupling. The drive motor provides the power source and outputs the speed and torque.

[0124] The passive end of the clutch, namely the output shaft 3, the dual steel plates fixed on the output shaft 3 and the cylinder sleeve 6 installed on the output shaft 3, the cylinder sleeve 6 is engaged with the dual steel plates, and the cylinder sleeve 6 is connected to the brake and the load motor through the coupling. The access of the load motor is controlled by adjusting the brake to realize the switching of the clutch rotation and braking working conditions.

[0125] In the clutch rotation working condition, the brake is not working, the load motor drives the clutch passive end to rotate, that is, the clutch cylinder sleeve 6 and the dual steel plate rotate; the drive motor drives the clutch active end, that is, the input shaft 2 and the friction plate rotate, and the clutch rotation working condition experiment is carried out;

[0126] In the braking condition of the clutch, the brake is working, the load motor is not working, the passive end of the clutch is braked, that is, the cylinder sleeve 6 and the dual steel plate of the clutch are braked, and the driving motor drives the active part of the clutch alone to carry out the braking condition experiment.

[0127] The temperature telemetry component processes the collected temperature data and transmits it to the host computer data acquisition and analysis device. Simultaneously, the host computer data acquisition and analysis device controls the loading of the load motor, thereby controlling the relative speed and loading conditions of the clutch's passive end. Furthermore, the host computer data acquisition and analysis device controls the operation of the drive motor, load motor, lubrication system, and cooling system.

[0128] Among them, the host computer data acquisition and analysis device includes:

[0129] ①Data processing and comparison module

[0130] This module includes three processing steps: noise filtering, timestamp alignment, and channel data comparison and verification to complete data processing and comparison.

[0131] Noise filtering: Use wavelet transform or low-pass filtering to process dynamic signals such as temperature to eliminate high-frequency interference.

[0132] (1) Data acquisition: obtain original temperature data.

[0133] (2) Initialization parameters: Set the window size of the moving average filter

[0134] (3) Data storage and update: The collected raw temperature data is grouped and processed to process a channel data. Every time new sampling data is obtained, the buffer array is updated and the earliest data point is discarded to keep the latest 5 sampling data in the array.

[0135] (4) Calculate the average value: process the five data points in the buffer array separately, calculate the average value of each temperature channel, and use this data as the temperature filter value at that moment.

[0136] (5) Repeat processing: perform the above moving average filtering operation on the data of each temperature channel in turn to obtain filtered temperature data and output the filtering result.

[0137] Timestamp alignment: The time synchronization module of the data acquisition system is used to ensure the timing consistency of input / output sensors, oil parameters, and vibration data. The following process is designed:

[0138] (1) Data sorting: sorting the data channels on the clutch

[0139] (2) Data transmission: The data is sent in a predetermined order. During the transmission process, a tag is added to each data so that the receiving end can recognize and distinguish it.

[0140] (3) Receiving and dividing: The receiving end receives data within a certain period of time, divides the data according to the data format and tag information, temporarily stores the received data in the buffer, and sorts it according to the tag.

[0141] (4) Data check: Check the integrity and order of the data. If the check passes, the data will be rearranged and stored in the order in which it was sent, ready for the next round of data transmission. If it fails, the data will be sent again.

[0142] Channel data comparison and verification procedure: Monitor two different circumferential positions on the same radial direction of the same set of steel sheets. Since the temperature values ​​of the two circumferential temperature monitoring channels are not significantly different, the following process is designed as a comparison, verification and early warning of temperature data:

[0143] (1) Data collection: Use temperature sensors to collect temperature data at two different circumferential positions on the same radial direction of the same group of steel sheets, which are recorded as T1 and T2.

[0144] (2) Calculate the average value of the two temperature data Avg_T = (T1 + T2) / 2. Set the temperature difference tolerance threshold TH = 10% and design the comparison function THn, where:

[0145]

[0146] (3) Compare the difference between each temperature data and the average value to verify the accuracy of data transmission. If the difference between the two temperature data and the average value is less than the tolerance threshold TH, the data is normal and monitoring continues.

[0147] (4) If the difference between the temperature data and the average value exceeds TH, it is considered that there is uneven contact. The time of this event is recorded and an alarm signal is sent to the upper level to inform that these parameter conditions of this working condition will cause uneven contact of the clutch or problems with equipment measurement.

[0148] ②Temperature assessment procedure

[0149] In order to prevent the negative impact of high temperature, the following high temperature judgment mechanism is set after obtaining the data:

[0150] (1) Real-time detection: The temperature measurement channel continuously collects temperature data at each point of the wet clutch

[0151] (2) Data processing: Analyze the collected temperature data at regular intervals. Find the maximum (T_max) and minimum (T_min) values ​​of the current temperature data on the plate with the largest temperature difference. Calculate the maximum radial temperature difference of the clutch ΔT = T_max - T_min.

[0152] (3) Condition judgment: Compare the calculated radial temperature difference ΔT with the set threshold value of 70°C.

[0153] (4) Alarm trigger (when ΔT > 70°C): Send an alarm signal to the host, for example, by sending a data packet containing the alarm information via a specific serial communication protocol. Activate the buzzer alarm, sounding a warning to nearby personnel. After the alarm state persists for 1 minute, the alarm system automatically resets, or waits for a manual reset operation.

[0154] (5) Continuous monitoring: Continue to monitor the temperature of the wet clutch in a cycle.

[0155] A method for using a test system for studying temperature changes of a clutch friction pair in a temperature field includes the following steps:

[0156] Build a clutch test bench and place the clutch, install the clutch temperature wireless measurement device inside the clutch, and connect the drive motor, load motor, lubrication system, cooling device, and data acquisition and analysis device;

[0157] Check the energy transfer efficiency between the host computer components and the temperature telemetry components;

[0158] Check the clutch operating status;

[0159] Perform the test according to the test parameter settings.

[0160] The specific process is:

[0161] ① Test preparation: Build a test bench, connect the temperature sensor, install the temperature telemetry system, and adjust the lubrication flow to ensure uniform lubrication of the clutch.

[0162] ②Energy transfer detection: Check the relative efficiency of energy transfer Ensure that energy transmission efficiency remains at the high transmission efficiency stage.

[0163] ③Data check: Start the drive motor, lubrication system, data acquisition and control system, set the working condition to braking condition, fix the cylinder liner, and keep the drive motor at low speed for 1 minute; check the temperature data of each channel to ensure that the temperature sensor uploads data smoothly. If it is displayed normally, the test requirements are met. If it cannot be displayed normally, check the sensor installation and equipment condition.

[0164] ④ Comparing measurement errors: Start the drive motor, lubrication system, and data acquisition and control system. Set the operating condition to braking, secure the cylinder liner, and maintain a constant piston pressure. Maintain the drive motor speed for the first 10 seconds and then zero speed for the next 110 seconds. Check the temperature data within 120 seconds. To ensure the reliability of wireless transmission, check the temperature data of each channel against the data from wired measurements and compare the wired and wireless measurements.

[0165] The maximum temperature Tmax, the time tmax at which the maximum temperature is reached, the equilibrium temperature T, and the time t at which the equilibrium temperature is reached were selected as characteristic points for error comparison. The maximum temperature is the highest temperature during the measurement process for both measurement methods, the maximum temperature arrival time is the time at which the maximum temperature is reached, and the equilibrium temperature is the stable temperature at which the temperature changes little after the end of the sliding friction for both measurement methods. The equilibrium temperature arrival time is the time when this temperature is reached.

[0166] In the error comparison process, relative error ε is used as the comparison method, and other characteristic parameters are also compared with this method. For example:

[0167]

[0168] Where Tmax is the maximum temperature measured by wired connection, and Tmax' is the maximum temperature measured by wireless connection.

[0169] If all the above errors are controlled within 5%, it means that the wireless test is relatively accurate and subsequent rotation condition tests can be carried out.

[0170] ⑤ Rotational Condition Measurement: Start the drive motor, load motor, lubrication system, and data acquisition and control system. Set the operating condition to rotational, with the cylinder liner rotating with the load motor. Maintain a constant drive motor speed for the first 10 seconds, then reduce the speed to zero for the next 110 seconds. Check the temperature data for 120 seconds. Each temperature acquisition channel collects data from the rotating friction pair and uploads the data to the host computer.

[0171] ⑥ Data processing: Compare the data accuracy of wired and wireless temperature measurements; obtain and process data from each channel, filter, align timestamps and compare corresponding channel data; complete high-temperature evaluation of clutch temperature.

[0172] The following is a specific application example using this test system:

[0173] ① Test preparation: Build a test bench, connect the temperature sensor, install the temperature telemetry system, and adjust the lubrication flow to ensure uniform lubrication of the clutch.

[0174] ②Energy transfer detection: Check the relative efficiency of energy transfer Ensure that energy transmission efficiency remains at the high transmission efficiency stage.

[0175] ③Data check: Start the drive motor, lubrication system, data acquisition and control system, set the working condition to braking condition, fix the cylinder liner, and keep the drive motor at low speed for 1 minute; check the temperature data of each channel to ensure that the temperature sensor uploads data smoothly. If it is displayed normally, the test requirements are met. If it cannot be displayed normally, check the sensor installation and equipment condition.

[0176] ④ Compare measurement errors: Start the drive motor, lubrication system, and data acquisition and control system, set the working condition to braking condition, fix the cylinder liner, and set the piston pressure to 0.3 MPa. Maintain the speed of the drive motor at 200, 300, and 400 r / min for the first 10 seconds, and then set the speed to 0 for the next 110 seconds. Check the temperature data within 120 seconds and compare the wired measurement data with the wireless measurement data.

[0177] ⑤ Rotational Condition Measurement: Start the drive motor, load motor, lubrication system, and data acquisition and control system. Set the operating condition to rotational, with the load motor at 100 rpm. The cylinder liner rotates with the load motor. Maintain the drive motor speed at 200, 300, and 400 rpm, and check the temperature data over a 120-second period. Each temperature acquisition channel collects data from the rotating friction pair and uploads the data to the host computer.

[0178] ⑥ Post-test processing: Compare the data accuracy of wired and wireless temperature measurements; obtain and process the data of each channel, filter, align the timestamps and compare the corresponding channel data; complete the high-temperature evaluation of the clutch temperature.

[0179] As an optional implementation, it also includes:

[0180] Wireless power supply efficiency evaluation module, used to monitor the wireless power supply efficiency between the host computer component and the temperature telemetry component;

[0181] The temperature evaluation module is used to determine the clutch operating status and clutch temperature level based on the temperature data obtained by the temperature telemetry component.

[0182] The wireless power supply efficiency evaluation program constitutes a wireless power supply efficiency evaluation module to realize the monitoring of the wireless power supply efficiency between the host computer component and the temperature telemetry component;

[0183] The temperature assessment module is composed of the temperature assessment program and the channel data comparison and verification program, which can determine the clutch operating status and clutch temperature level.

[0184] The specific processes of the wireless power supply efficiency evaluation procedure, temperature evaluation procedure, and channel data comparison and verification procedure have been explained and will not be repeated here.

[0185] Compared with traditional technologies, the present invention is based on the existing bench design, does not change the overall structure of the existing clutch, and accurately measures temperature data. Different tooling can be designed according to different requirements based on this technical principle. The wireless measurement method adopted can help measure the engagement and separation conditions of the wet clutch, and complete working conditions that are difficult to achieve with wired measurement, which is conducive to the development of clutch temperature measurement under actual vehicles. The temperature acquisition scheme of the present invention can collect the temperature of the steel plate and complete the overall monitoring of the clutch steel plate temperature field. In addition, multi-channel temperature data collection is set according to demand, and the detection data is large and wide, which fully meets the existing clutch temperature measurement needs.

[0186] Aiming at the complex working environment of the wet clutch, the present invention integrates the sensor into the structure of the clutch cylinder liner, which can achieve effective data output and study the temperature data of the rotating friction pair.

[0187] This invention uses filtering to ensure data accuracy and performs temperature verification by comparing it with a high-precision temperature measurement device, effectively reflecting temperature data with high accuracy. A multi-channel data comparison and verification mechanism, along with a timing consistency mechanism, ensures the timing of data transmission and facilitates data processing. Furthermore, by comparing data from multiple channels, the stability of the measurement instrument data is ensured. Furthermore, alarms can be issued based on specific circumstances, providing feedback on uneven clutch contact.

[0188] The present invention designs a power supply efficiency alarm mechanism to monitor the energy transmission efficiency in the standby state, and issues a corresponding alarm once the energy transmission enters a critical stage or an inefficient stage.

[0189] The present invention designs a high-temperature assessment mechanism. When a part of the clutch exceeds the dangerous temperature range, a buzzer alarm will be used to remind nearby people.

[0190] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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.

[0191] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A wireless clutch temperature measuring device, characterized in that: include: A host computer component fixed on a clutch housing (1) and a temperature telemetry component fixed on a cylinder sleeve (6) of the clutch, wherein a temperature detection end of the temperature telemetry component is mounted on a dual steel plate of the clutch; The temperature telemetry assembly is used to detect the frictional heat temperature between the dual steel plate and the friction plate; The host computer component supplies energy to the temperature telemetry component through wireless power supply; The host computer component is signal-connected to the temperature telemetry component.

2. A clutch temperature wireless measuring device according to claim 1, characterized in that: The host computer components include: A host computer platform (10) is fixed to the box (1); A host computer side circuit board (9) is coaxially fixed on the host computer side platform (10); The host computer circuit board (9) is provided with an energy transmission module (17), a second data processing chip (18) and a second wireless data transmission module (19).

3. A clutch temperature wireless measuring device according to claim 2, characterized in that: The temperature remote sensing component includes: A collecting end platform (7) is coaxially fixedly connected to the cylinder sleeve (6); The collecting end circuit board (8) is coaxially fixed on the collecting end platform (7), and the collecting end platform (7) is provided with a wireless data transmission module (13), a data processing chip (14) and an energy receiving module (12), the wireless data transmission module (13) is signal-connected to the data processing chip (18), and the energy sending module (17) is electrically connected to the energy receiving module (12); The collection end circuit board (8) is electrically connected to a plurality of temperature detection components, and the temperature detection components are arranged on corresponding dual steel sheets.

4. The wireless clutch temperature measuring device according to claim 3, characterized in that: Two temperature detection components are provided on any of the dual steel sheets, and the angle between the two temperature detection components is 80°.

5. The wireless clutch temperature measuring device according to claim 4, characterized in that: The temperature detection assembly includes two temperature detection parts, which are symmetrically arranged. The angle between the line connecting the two temperature detection parts of any temperature detection assembly and the line connecting the two temperature detection parts of another temperature detection assembly is 80°.

6. The wireless clutch temperature measuring device according to claim 5, characterized in that: The temperature detection unit comprises three thermocouples (16), which are arranged in sequence from the inside to the outside along the diameter direction of the dual steel sheets, and the thermocouples (16) are electrically connected to the collection end circuit board (8).

7. The wireless clutch temperature measuring device according to claim 6, characterized in that: The acquisition end circuit board (8) is provided with a plurality of temperature measurement channels (15), which are arranged at equal intervals in the circumferential direction. The temperature measurement channels (15) are used to be electrically connected to the thermocouple (16), and the temperature measurement channels (15) are electrically connected to the data processing chip (14).

8. The wireless clutch temperature measuring device according to claim 7, characterized in that: An acrylic support frame (11) is fixedly connected to the upper machine end platform (10), and the acrylic support frame (11) is fixedly connected to the box (1); The upper machine end platform (10) is fixedly connected to the oil distribution sleeve (5) of the clutch; The cylinder sleeve (6) rotates coaxially with the sleeve (4) of the clutch, the sleeve (4) is coaxially sleeved on the inner side of the cylinder sleeve (6), and the housing (1) is fixedly connected to the sleeve (4).

9. A test system for studying clutch temperature field and friction pair temperature changes, using a clutch temperature wireless measurement device according to any one of claims 1 to 8, characterized in that: include: A clutch test bench is used to place a clutch, and the clutch temperature wireless measuring device is installed in the clutch; A driving motor is axially connected to the input shaft (2) of the clutch; A load motor is axially connected to the output shaft (3) of the clutch, and a brake is provided between the load motor and the output shaft (3); a lubrication system connected to the clutch and used for lubricating the clutch; a cooling device connected to the lubrication system and used for cooling the lubricating oil in the lubrication system; a data acquisition and analysis device, electrically connected to the lubrication system, the cooling device, the drive motor, the load motor, and the brake; The data acquisition and analysis device is electrically connected to the host computer component.

10. A test system for studying clutch temperature field and friction pair temperature changes according to claim 9, characterized in that: Also includes: A wireless power supply efficiency evaluation module, used for monitoring the efficiency of wireless power supply between the host computer component and the temperature telemetry component; A temperature evaluation module is used to determine the clutch operating state and the clutch temperature level based on the temperature data obtained by the temperature telemetry component.

Images