CAN bus-based multi-parameter online monitoring system for lubricating oil of gearbox of existing heavy haul train

Abstract

The utility model discloses an existing heavy haul train gearbox lubricating oil multi-parameter on-line monitoring system based on a CAN bus, which comprises n oil compound sensors, the CAN bus and a monitoring host, the monitoring host and the n oil compound sensors are networked through the CAN bus, the oil compound sensors are installed at an oil discharge port of an existing locomotive running gear, and the CAN bus is connected with the monitoring host. The oil level, the oil temperature, the moisture value, the viscosity and the density data of the heavy haul train gearbox lubricating oil are collected and processed through the oil liquid composite sensor, and the data are sent to the monitoring host through the CAN bus to be analyzed; the device has the beneficial effects that in the long-term continuous operation process of the locomotive, the oil quality characteristics, the oil temperature and the oil level parameters of lubricating oil of each gearbox of the running part of the locomotive can be monitored on line, the deterioration state of the oil is mastered in real time, the oil of the gearbox is replaced in time, the safe service life of the gearbox is effectively prolonged, and the working efficiency is improved. And the running health and safety of the heavy-load train are ensured.

Description

Technical Field

[0001] The utility model belongs to the field of oil multi-parameter online monitoring, and specifically relates to an existing heavy-load train gearbox lubricating oil multi-parameter online monitoring system based on a CAN bus. Background Art

[0002] In my country's heavy-duty train transportation system, heavy-duty trains are the main force in transporting bulk raw materials such as coal, ore and other materials. Their stable and safe operation is of great significance to economic construction. The locomotive is the power core of this transportation system, and its running gear box is the key transmission hub, which is directly related to the traction efficiency and operation safety of the train. As the train has been subjected to high-intensity and long-distance continuous operation for a long time, the working environment inside the gearbox has become particularly complex and harsh. In the continuous mechanical movement, the gears in the gearbox are frequently meshed, and a large amount of friction and wear are generated in this process, which will directly lead to a sharp increase in the oil temperature. Under high temperature environment, the additives in the oil gradually fail, and the performance of the base oil decreases. At the same time, impurities such as metal particles and dust generated by wear continue to accumulate in the oil, forming a vicious circle, which further accelerates the deterioration of the oil quality. The deterioration of oil quality not only weakens its original lubricating effect, but may also cause the lubricating film between the gear meshing surfaces to rupture, causing the gear surfaces in direct contact to be subject to greater friction and wear. Over time, the gear meshing accuracy will be impaired, wear will increase, and eventually gearbox failure may occur, posing a serious threat to the safe operation of heavy-load trains.

[0003] At present, the observation of the lubricating oil condition of the locomotive running gearbox is only done manually through a glass transparent observation window or an oil dipstick to observe the lubricating oil level condition regularly. For the oil quality characteristic parameters such as oil viscosity, density, and water content, samples can only be taken from the locomotive running gearbox for offline measurement. If multiple parameters of the gearbox lubricating oil are monitored, if each type of parameter is monitored by a sensor, it is necessary to open holes on the gearbox to install and arrange multiple sensors, which will inevitably affect the structural characteristics of the existing locomotive gearbox. Therefore, a CAN bus-based oil composite sensor is developed. The oil composite sensor is installed at the existing oil unloading port of the locomotive running gearbox, and a multi-parameter online monitoring system for the existing heavy-duty train gearbox lubricating oil is constructed through the CAN bus networking. It is of great significance to realize the online monitoring of the oil quality characteristics, oil temperature, and oil level parameters of the locomotive running gearbox lubricating oil during the long-term continuous operation of the locomotive, grasp the deterioration state of the oil in real time, and replace the gearbox oil in time to ensure the driving safety of heavy-duty trains. Summary of the invention

[0004] The present invention adopts the following technical scheme:

[0005] Based on the above background, the present utility model provides an online multi-parameter monitoring system for the lubricating oil of the gearbox of existing heavy-haul trains based on the CAN bus.

[0006] The technical solution of the present utility model to solve the above problems is: An online multi-parameter monitoring system for the lubricating oil of the gearbox of existing heavy-haul trains based on the CAN bus includes n a plurality of oil compound sensors, a CAN bus, and a monitoring host, n The value of is determined by the number of gearboxes in the running gear of the heavy-haul train, n The plurality of oil compound sensors are connected to the monitoring host through the CAN bus to realize data transmission between the oil compound sensors and the monitoring host.

[0007] In the present utility model, for the online multi-parameter monitoring system for the lubricating oil of the gearbox of existing heavy-haul trains based on the CAN bus, it is characterized in that: The oil compound sensor includes a main control unit, an oil level detection unit, an oil temperature detection unit, an oil moisture value detection unit, an oil viscosity density detection unit, a CAN bus transceiver module, and a regulated power supply module; The oil level detection unit includes an oil level front-end measurement element, an isolation chip, and an amplification chip, the oil temperature detection unit includes an oil temperature front-end measurement element, the oil moisture value detection unit includes a moisture value front-end measurement element, a gain buffer chip, and a capacitance measurement chip, and the oil viscosity density detection unit includes a viscosity density front-end measurement element and an impedance measurement chip; The circuit board of the oil compound sensor is divided into a front-end circuit board and a rear-end circuit board. The front-end circuit board includes an oil level front-end measurement element, an isolation chip, an oil temperature front-end measurement element, a moisture value front-end measurement element, a gain buffer chip, and a viscosity density front-end measurement element. The rear-end circuit board includes a main control unit, an amplification chip, a capacitance measurement chip, an impedance measurement chip, a CAN bus transceiver module, and a regulated power supply module; The oil level front-end measurement element, the oil temperature front-end measurement element, the moisture value front-end measurement element, and the viscosity density front-end measurement element on the front-end circuit board respectively pass through the corresponding holes on the sealing plate of the composite sensor housing. The front-end circuit board is placed in the front-end mounting seat of the composite sensor housing. The cavity formed between the sealing plate and the mounting seat of the composite sensor housing is filled with insulating structural adhesive, and the circuit board is wrapped in the insulating structural adhesive to prevent oil from entering the sensor housing; The rear-end circuit board is placed in the connection seat of the composite sensor housing.

[0008] In the present utility model, the oil compound sensor is characterized in that: the oil level front-end measuring element of the front-end circuit board is connected to an isolation chip, and the water content front-end measuring element is connected to a gain buffer chip; the isolation chip of the front-end circuit board is connected to the amplification chip of the rear-end circuit board, and then the amplification chip is connected to the main control unit; the oil temperature front-end measuring element of the front-end circuit board is connected to the main control unit of the rear-end circuit board; the gain buffer chip of the front-end circuit board is connected to the capacitance measuring chip of the rear-end circuit board, and then the capacitance measuring chip is connected to the main control unit; the viscosity and density front-end measuring element of the front-end circuit board is connected to the impedance measuring chip of the rear-end circuit board, and then the amplification chip is connected to the main control unit; the CAN bus transceiver module is connected to the main control unit; and the power supply voltage stabilizing module is connected to the main control unit.

[0009] In the present utility model, the oil compound sensor is characterized in that: the oil level detection unit, the oil temperature detection unit, the oil water content detection unit, and the oil viscosity and density detection unit respectively use an FSR406 thin-film differential pressure sensor, a DS18B20 digital temperature sensor, a bipolar capacitor, and a quartz tuning fork as front-end measuring elements to detect oil parameters.

[0010] In the present utility model, the oil compound sensor is characterized in that: the CAN bus transceiver module uses a TAJ1050 chip, which converts the logic level of the main control unit into the physical layer level used by the CAN bus and is responsible for sending data to the bus. At the same time, it receives data on the bus and converts it into a logic level suitable for the main control unit. The CAN bus transceiver also includes filtering and protection circuits to ensure reliable communication.

[0011] In the present utility model, the oil compound sensor is characterized in that: the voltage stabilizing power supply module uses an AMS1117 voltage stabilizing chip to provide a stable voltage for the main control unit.

[0012] The beneficial effects of the present utility model are as follows: The present utility model uses CAN bus communication technology to construct an online monitoring system for multiple parameters of the lubricating oil of the heavy-haul train gearbox. The monitoring host and n a plurality of oil compound sensors are networked through the CAN bus. The oil compound sensors are installed at the oil discharge port of the gearbox of the locomotive running gear of the existing locomotive. Through the oil compound sensors, the oil level, oil temperature, water content, viscosity and density data of the lubricating oil of the heavy-haul train gearbox are collected and processed, and the data is sent to the monitoring host through the CAN bus for analysis. Thus, during the long-term continuous operation of the locomotive, the oil quality characteristics, oil temperature, and oil level parameters of the lubricating oil of each gearbox of the locomotive running gear can be monitored online, the deterioration state of the oil can be grasped in real time, the gearbox oil can be replaced in time, the safe service life of the gearbox can be effectively extended, and the driving safety and health of the heavy-haul train can be ensured. Description of the Drawings

[0013] Figure 1 This is the system topology block diagram of the present utility model.

[0014] Figure 2 This is the principle block diagram of the oil-hydraulic composite sensor of the present utility model.

[0015] Figure 3 This is the block diagram of the circuit embodiment of the regulated power supply module of the present utility model.

[0016] Figure 4 This is the circuit embodiment diagram of the main control unit of the present utility model.

[0017] Figure 5 This is the circuit embodiment diagram of the CAN bus transceiver module of the present utility model.

[0018] Figure 6 This is the circuit embodiment diagram of the oil level detection unit of the present utility model.

[0019] Figure 7 This is the circuit embodiment diagram of the oil temperature detection unit of the present utility model.

[0020] Figure 8 This is the circuit embodiment diagram of the oil-hydraulic moisture content detection unit of the present utility model.

[0021] Figure 9 This is the circuit embodiment diagram of the oil-hydraulic viscosity and density detection unit of the present utility model. Detailed implementation manners

[0022] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] As shown in the Figure 1 accompanying drawings, the system topology block diagram of the present utility model includes n several oil-hydraulic composite sensors based on the CAN bus, the CAN bus, and the monitoring host. The number of oil-hydraulic composite sensors n is determined by the number of gearboxes in the running gear of the heavy-haul train. n The several oil-hydraulic composite sensors are connected to the monitoring host through the CAN bus to realize data transmission between the oil-hydraulic composite sensors and the monitoring host.

[0024] As shown in the Figure 2As shown in the figure, the principle block diagram of the oil composite sensor of the present utility model. The oil composite sensor includes a main control unit, an oil level detection unit, an oil temperature detection unit, an oil moisture value detection unit, an oil viscosity density detection unit, a CAN bus transceiver module, and a regulated power supply module. The oil level detection unit includes an oil level front-end measurement element, an isolation chip, and an amplification chip. The oil temperature detection unit includes an oil temperature front-end measurement element. The oil moisture value detection unit includes a moisture value front-end measurement element, a gain buffer chip, and a capacitance measurement chip. The oil viscosity density detection unit includes a viscosity density front-end measurement element and an impedance measurement chip. The circuit board of the oil composite sensor is divided into a front-end circuit board and a rear-end circuit board. The front-end circuit board includes an oil level front-end measurement element, an isolation chip, an oil temperature front-end measurement element, a moisture value front-end measurement element, a gain buffer chip, and a viscosity density front-end measurement element. The diameter of the front-end circuit board is 16 mm. The rear-end circuit board includes a main control unit, an amplification chip, a capacitance measurement chip, an impedance measurement chip, a CAN bus transceiver module, and a regulated power supply module. The diameter of the rear-end circuit board is 33 mm. The oil level front-end measurement element, the oil temperature front-end measurement element, the moisture value front-end measurement element, and the viscosity density front-end measurement element on the front-end circuit board respectively pass through the corresponding holes on the sealing plate of the composite sensor housing. The front-end circuit board is placed in the front-end mounting seat of the composite sensor housing. The inner diameter of the front-end mounting seat is 16.5 mm. The cavity formed between the sealing plate and the mounting seat of the composite sensor housing is filled with insulating structural adhesive. The circuit board is wrapped in the insulating structural adhesive to prevent oil from entering the sensor housing. The rear-end circuit board is placed in the connecting seat of the composite sensor housing. The oil level front-end measurement element on the front-end circuit board is connected to the isolation chip, and the moisture value front-end measurement element is connected to the gain buffer chip. The isolation chip on the front-end circuit board is connected to the amplification chip on the rear-end circuit board, and then the amplification chip is connected to the main control unit. The oil temperature front-end measurement element on the front-end circuit board is connected to the main control unit on the rear-end circuit board. The gain buffer chip on the front-end circuit board is connected to the capacitance measurement chip on the rear-end circuit board, and then the capacitance measurement chip is connected to the main control unit. The viscosity density front-end measurement element on the front-end circuit board is connected to the impedance measurement chip on the rear-end circuit board, and then the amplification chip is connected to the main control unit. The CAN bus transceiver module is connected to the main control unit. The power supply voltage regulation module is connected to the main control unit. The oil parameters are detected. The physical quantities of the oil level, oil temperature, oil moisture value, and oil viscosity density are converted into electrical signals through the front-end measurement elements, and then converted into digital signals through analog-to-digital conversion and sent to the main control unit for data processing. The regulated power supply module converts the 5V voltage into 3.3V voltage to provide a stable working voltage for the main control unit. The processed data is transmitted to the monitoring host through the CAN bus transceiver module for data analysis. According to the multi-parameter standard of the lubricating oil, the deterioration state of the oil is judged and evaluated to ensure the driving safety of the heavy-haul train.

[0025] As attached Figure 3As shown in the figure, it is a block diagram of an embodiment of the regulated power supply module of the present utility model. The regulated circuit uses an AMS1117 voltage regulator chip to stabilize the externally input 5V voltage to 3.3V voltage. The 10uF bipolar capacitors and 0.1uF bipolar capacitors on both sides of the voltage regulator chip mainly play a filtering role to make the output voltage more stable. The regulated circuit mainly provides a stable voltage for the main control chip.

[0026] As shown in the Figure 4 figure, it is a circuit diagram of an embodiment of the main control unit of the present utility model. The main control unit selects the STM32F103C8T6 single-chip microcomputer as the main control chip, which is used to implement functions such as data acquisition, internal ADC signal conversion, CAN bus communication, and data processing; the pins PB8 and PB9 of the single-chip microcomputer are connected to the D and R pins of TJA1050 in the CAN bus transceiver module circuit; the pin PA1 of the single-chip microcomputer is connected to the output end ADC_1 of MCP6001 in the oil level detection unit circuit; the pin PA2 of the single-chip microcomputer is connected to the pin 2 of DS18B20 in the oil temperature detection unit circuit; the pins PB10, PB11, and PB13 of the single-chip microcomputer are connected to the SCL, SDA, and / RED of AD7745 in the oil moisture value detection unit circuit; the pins PB6 and PB7 of the single-chip microcomputer are connected to the SCL and SDA of AD5933 in the oil viscosity and density detection unit circuit.

[0027] As shown in the Figure 5 figure, it is a circuit diagram of an embodiment of the CAN bus transceiver module of the present utility model. The CAN bus transceiver module circuit selects the TJA1050 chip. Two 120-ohm resistors are connected in parallel between CAN_H and CAN_L, which can match the bus impedance and eliminate signal reflection. The D and R pins of TJA1050 in the CAN bus transceiver module circuit are connected to the pins PB7 and PB8 of the single-chip microcomputer. At the same time, the CAN controller is integrated inside the single-chip microcomputer. By correctly configuring the parameters of the relevant registers of the CAN controller, two-way data transmission can be achieved through the CAN bus transceiver circuit.

[0028] As shown in the Figure 6As shown in the figure, it is a circuit embodiment diagram of the oil level detection unit of the present utility model. The oil level detection unit circuit uses the FSR406 thin film differential pressure sensor as the front-end measurement element for the oil level, the operational amplifier LM324AN as the isolation chip, and the operational amplifier MCP6001 as the amplification chip; the FSR406 thin film differential pressure sensor converts the pressure signal exerted by the lubricating oil on it into a voltage signal, uses the LM324AN operational amplifier for signal isolation and buffering to obtain a more stable voltage signal, and then uses the MCP6001 operational amplifier to amplify the input voltage signal. The amplification factor can be adjusted through the sliding rheostat RP1 to obtain an appropriate voltage signal; then the amplified voltage signal is output through ADC_1 and connected to the multiplexed pin PA1 of the single-chip microcomputer that can perform ADC conversion. Finally, the amplified signal is sent to the single-chip microcomputer for data processing to obtain the oil level.

[0029] As shown in the appendix Figure 7 As shown in the figure, it is a circuit embodiment diagram of the oil temperature detection unit of the present utility model. The oil temperature detection unit circuit uses the temperature sensor DS18B20 as the front-end measurement element. The pin 2 of DS18B20 is connected to the pin PA2 of the single-chip microcomputer. This sensor is a single-bus digital temperature sensor, and its control commands and data are input and output in the form of digital signals. The single-chip microcomputer reads the temperature data by sending control commands to DS18B20.

[0030] As shown in the appendix Figure 8 As shown in the figure, it is a circuit embodiment diagram of the oil moisture content detection unit of the present utility model. The oil moisture content detection unit circuit uses the bipolar capacitor C17 as the front-end measurement element, the operational amplifier AD8515 as the gain buffer chip, and the capacitance digital converter AD7745 as the capacitance measurement chip; AD8515 is a rail-to-rail operational amplifier. After being gain-buffered by the operational amplifier AD8515, a low-impedance drive signal source is formed to ensure that the bipolar capacitor C17 is fully charged when the AD7745 starts sampling; the AD7745 chip with high resolution and Σ-Δ capacitance digital converter is used to measure the connection of the bipolar capacitor. The SCL, SDA, and / RED pins of the AD7745 chip are respectively connected to the PB10, PB11, and PB13 pins of the single-chip microcomputer. Through this connection, the data is sent to the single-chip microcomputer for data processing to obtain the oil moisture content.

[0031] As shown in the appendix Figure 9 As shown in the figure, it is a circuit embodiment diagram of the oil viscosity and density detection unit of the present utility model. The oil viscosity and density detection unit circuit uses the quartz tuning fork X3 as the front-end measurement element and the impedance converter AD5933 as the impedance measurement chip; AD5933 integrates a frequency generator and a 12-bit, 1MSPS analog-to-digital converter ADC, I 2C serial interface, the external complex impedance is excited by the frequency signal generated by the quartz tuning fork X3. The response signal of the external impedance is sampled by the on-chip ADC of the AD5933, and then processed by the discrete Fourier transform DFT, returning a real part data word and an imaginary part data word at each frequency. The SCL and SDA pins of the AD5933 chip are connected to the PB6 and PB7 pins of the single-chip microcomputer, and the data is sent to the single-chip microcomputer to calculate the impedance amplitude and relative phase of each scanning frequency point, and then the oil viscosity and density are obtained through calibration.

[0032] The working principle of the present utility model is as follows: The oil compound sensor is installed at the oil discharge port of the gearbox of the existing locomotive running gear. The front mounting seat of the oil compound sensor is immersed in the lubricating oil of the gearbox. The physical quantities of the oil level, oil temperature, moisture value, viscosity, and density parameters of the oil are converted into electrical signals through the FSR406 thin-film differential pressure sensor, DS18B20, bipolar capacitor, and the front-end measuring element of the quartz tuning fork. After signal isolation, amplification, gain buffering, and measurement, the data is collected to the main control unit for data processing, and the processed data is sent to the monitoring host through the CAN bus for analysis, so as to realize the on-line monitoring of the oil quality characteristics, oil temperature, and oil level parameters of the lubricating oil in each gearbox of the locomotive running gear during the long-term continuous operation of the locomotive, grasp the deterioration state of the oil in real time, replace the gearbox oil in time, effectively extend the safe service life of the gearbox, and ensure the driving health and safety of the heavy-haul train.

[0033] The above are only the preferred embodiments of the present utility model, and are not limited to the above embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An online monitoring system for multi-parameters of lubricating oil of existing heavy-haul train gearboxes based on CAN bus, characterized in that: It includes n an oil compound sensor, a CAN bus, and a monitoring host. n The value of is determined by the number of gearboxes in the running gear of the heavy-haul train. n The oil compound sensors are connected to the monitoring host through the CAN bus for data transmission. The oil compound sensor includes a main control unit, an oil level detection unit, an oil temperature detection unit, an oil moisture value detection unit, an oil viscosity and density detection unit, a CAN bus transceiver module, and a regulated power supply module. The oil level detection unit includes an oil level front-end measurement element, an isolation chip, and an amplification chip. The oil temperature detection unit includes an oil temperature front-end measurement element. The oil moisture value detection unit includes a moisture value front-end measurement element, a gain buffer chip, and a capacitance measurement chip. The oil viscosity and density detection unit includes a viscosity and density front-end measurement element and an impedance measurement chip.

2. The multi-parameter online monitoring system for the lubricating oil of the existing heavy-haul train gearbox based on the CAN bus according to claim 1, characterized in that: The oil level detection unit circuit of the oil composite sensor uses the FSR406 thin-film differential pressure sensor as the front-end measurement element for oil level, the operational amplifier LM324AN as the isolation chip, and the operational amplifier MCP6001 as the amplification chip; the FSR406 thin-film differential pressure sensor converts the pressure signal exerted by the lubricating oil on it into a voltage signal, uses the LM324AN operational amplifier for signal isolation and buffering to obtain a more stable voltage signal, and then uses the MCP6001 operational amplifier to amplify the input voltage signal. The amplification factor can be adjusted by the sliding rheostat RP1 to obtain an appropriate voltage signal; then the amplified voltage signal is output through ADC_1 and connected to the multiplexed pin PA1 of the microcontroller that can perform ADC conversion, and finally the amplified signal is sent to the microcontroller for data processing to obtain the oil level.

3. An online monitoring system for multi-parameters of lubricating oil of existing heavy-haul train gearboxes based on the CAN bus according to claim 1, characterized in that: The oil moisture value detection unit circuit of the oil composite sensor uses a bipolar plate capacitor as the front-end measurement element, the operational amplifier AD8515 as the gain buffer chip, and the capacitance digital converter AD7745 as the capacitance measurement chip; after being buffered by the operational amplifier AD8515 to form a low-impedance drive signal source, it ensures that the bipolar plate capacitor is fully charged when the AD7745 starts sampling; uses the AD7745 chip to measure the connection of the bipolar plate capacitor. The SCL, SDA, and / RED pins of the AD7745 chip are respectively connected to the pins of the microcontroller, and the data is sent to the microcontroller through this connection for data processing to obtain the oil moisture value.

4. An on-line multi-parameter monitoring system for the lubricating oil of the gearbox of an existing heavy-haul train based on the CAN bus according to claim 1, characterized in that: The oil viscosity and density detection unit circuit of the oil composite sensor uses a quartz tuning fork as the front-end measurement element and the impedance converter AD5933 as the impedance measurement chip; the frequency signal generated by the quartz tuning fork is used to excite the external complex impedance, and the response signal of the external impedance is sampled by the on-chip ADC of the AD5933, and then undergoes discrete Fourier transform DFT processing, returning a real part data word and an imaginary part data word at each frequency. The SCL and SDA pins of the AD5933 chip are connected to the pins of the microcontroller, and the data is sent to the microcontroller to calculate the impedance amplitude and relative phase at each scanning frequency point, and then the oil viscosity and density are obtained through calibration.

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