CN111426331A - Railway locomotive running kilometer collecting card - Google Patents
Railway locomotive running kilometer collecting card Download PDFInfo
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- CN111426331A CN111426331A CN202010193663.5A CN202010193663A CN111426331A CN 111426331 A CN111426331 A CN 111426331A CN 202010193663 A CN202010193663 A CN 202010193663A CN 111426331 A CN111426331 A CN 111426331A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C22/00—Measuring distance traversed on the ground by vehicles, persons, animals or other moving solid bodies, e.g. using odometers, using pedometers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a railway locomotive running kilometer acquisition card which is based on an original TAX box of a railway locomotive, a speed sensor I and a speed sensor II, wherein the railway locomotive running kilometer acquisition card is inserted into a reserved standby unit slot of the TAX box of the locomotive, and speed data of the speed sensor I and the speed sensor II are provided for the TAX box to be broadcasted; the locomotive running kilometer acquisition card comprises a wireless WIFI communication module, a wireless WIFI power amplification module, a nonvolatile power-down storage module, a DC-DC isolation power supply module, a GPS/BD module, an isolation RS485 communication module and an embedded main control module; the invention can count the number of running kilometers of the locomotive with centimeter-level precision, and timely, accurately and automatically upload running kilometer data, thereby providing relevant basis for the application and maintenance of the locomotive of a railway system and the subsequent big data analysis, and having important significance for ensuring the safety of railway transportation.
Description
Technical Field
The invention relates to the technical field of railway locomotive running kilometer acquisition cards, in particular to a railway locomotive running kilometer acquisition card.
Background
Like ordinary cars, railways pay great attention to how many kilometers the locomotive runs. At present, data acquisition of railway locomotive running kilometers is firstly from a locomotive application statistical report and secondly from manual recording of a locomotive operator. The statistical report mode has the disadvantages of poor timeliness, poor data accuracy, and time and labor waste due to the fact that a large amount of calculation and statistics work exists in the middle; in the manual data recording mode of the running kilometer, the defects that the locomotive odometer (also a device) is likely to cause meter changing data loss and human errors and mistakes during recording due to faults and maintenance in the use process of the locomotive exist, meanwhile, workers need to climb on the locomotive to perform manual operation, a large amount of workload is increased, and meanwhile, the safety problem also exists in the climbing operation. Therefore, a railway locomotive running kilometer acquisition card is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a railway locomotive running kilometer acquisition card.
In order to achieve the purpose, the invention provides the following technical scheme:
a railway locomotive running kilometer acquisition card is based on a locomotive TAX box, a speed sensor I and a speed sensor II which are installed on the locomotive, wherein the railway locomotive running kilometer acquisition card is inserted into a reserved spare unit slot of the locomotive TAX box, and speed data of the speed sensor I and the speed sensor II are provided for the TAX box to be broadcasted;
the railway locomotive running kilometer acquisition card comprises a wireless WIFI communication module, a wireless WIFI power amplification module, a nonvolatile power-down storage module, a DC-DC isolation power supply module, a GPS/BD module, an isolation RS485 communication module and an embedded main control module;
when the locomotive returns to the railway locomotive service section, the wireless WIFI communication module can be automatically connected with a wireless AP installed at the railway side, and then the running kilometer data of the locomotive is sent to a ground server through the wireless AP;
the wireless WIFI power amplification module is used for performing power amplification on a WIFI signal of the wireless WIFI communication module so that the railway locomotive running kilometer acquisition card and a ground wireless AP can be reliably connected and data can be transmitted;
the nonvolatile power-down storage module is used for storing recorded data; the DC-DC isolation power supply module directly takes electricity from a 110V power supply of the locomotive in an isolation mode; the GPS/BD module adopts a new generation SIRFIII low-power chip and can be used for quickly and accurately positioning in places with weak satellite signals, such as urban canyons, viaducts and the like; the embedded main control module is responsible for decoding collected data, extracting speed, calculating kilometers, storing and sending.
Preferably, the wireless WIFI communication module is a high-reliability industrial-grade and low-power-consumption embedded module, a TCP/IP protocol stack is arranged in the wireless WIFI communication module, and standard TCP/IP communication can be achieved.
Preferably, the wireless WIFI power amplification module is internally provided with a high-speed transceiving switching automatic judging circuit, so that transceiving states can be automatically switched, and the wireless WIFI power amplification module can automatically work without giving a control signal by a wireless WIFI communication module, thereby being compatible with any WIFI occasions and ensuring the WIFI signal transmission distance and connection stability.
Preferably, the nonvolatile power-down storage module is a Random Access Memory (RAM) with a backup battery, and a hardware protection circuit and a power supply monitoring circuit are arranged in the nonvolatile power-down storage module.
Preferably, the isolation RS485 communication module selects an integrated and complete electrical isolation type RS485/RS422 data communication interface chip MAX1480 produced by the american and american letter company, and adopts a hybrid microcircuit structure, and a complete isolation interface formed by a transceiver, an optical coupler and a transformer is integrated in a standard DIP28 pin package.
Preferably, the size of the railway locomotive running kilometer acquisition card is a standard plug-in board of a 19-inch 4U case structure, and the plug-in board, the plug-in board and the fixation completely meet the national standard of the mechanical structure of GB/T19520 electronic equipment.
The invention adds a railway locomotive running kilometer collecting card in a locomotive TAX box, the collected locomotive speed information is very accurate, because the locomotive is provided with a speed sensor I and a speed sensor II for comparing by an L KJ monitor, the influence of wheel pair idle running and wheel slip on the speed can be eliminated by a certain algorithm in the locomotive TAX box, and simultaneously, a L KJ monitor can automatically correct the error of the locomotive wheel diameter according to the distance between signal machines in the running process, so that the output speed value is very accurate.
Compared with the prior art, the invention has the beneficial effects that: the invention can count the number of running kilometers of the locomotive with centimeter-level precision, and timely, accurately and automatically upload running kilometer data, thereby providing relevant basis for the application and maintenance of the locomotive of a railway system and the subsequent big data analysis, and having important significance for ensuring the safety of railway transportation.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic functional structure diagram of a WIFI communication module according to the present invention;
fig. 3 is a schematic diagram of a typical application of the WIFI power amplification module of the present invention;
FIG. 4 is a schematic diagram of an EMC peripheral circuit of the DC-DC isolated power supply module of the present invention;
FIG. 5 is a schematic diagram of an output filter circuit of the DC-DC isolated power supply module according to the present invention;
FIG. 6 is a schematic diagram of a peripheral circuit schematic of the GPS/BD module of the present invention;
FIG. 7 is a schematic diagram of the output waveform of the driver according to the present invention;
FIG. 8 is a FFT graph corresponding to the output waveform of the driver of the present invention;
FIG. 9 is a diagram illustrating an exemplary MAX1480 application of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-9, the present invention provides a technical solution:
a railway locomotive running kilometer acquisition card is based on a locomotive TAX box, a speed sensor I and a speed sensor II which are installed on the locomotive, wherein the railway locomotive running kilometer acquisition card is inserted into a reserved spare unit slot of the locomotive TAX box, and speed data of the speed sensor I and the speed sensor II are provided for the TAX box to be broadcasted;
the railway locomotive running kilometer acquisition card comprises a wireless WIFI communication module, a wireless WIFI power amplification module, a nonvolatile power-down storage module, a DC-DC isolation power supply module, a GPS/BD module, an isolation RS485 communication module and an embedded main control module;
when the locomotive returns to the railway locomotive service section, the wireless WIFI communication module can be automatically connected with a wireless AP installed at the railway side, and then the running kilometer data of the locomotive is sent to a ground server through the wireless AP;
the wireless WIFI power amplification module is used for performing power amplification on a WIFI signal of the wireless WIFI communication module so that the railway locomotive running kilometer acquisition card and a ground wireless AP can be reliably connected and data can be transmitted;
the nonvolatile power-down storage module is used for storing recorded data; the DC-DC isolation power supply module directly takes electricity from a 110V power supply of the locomotive in an isolation mode; the GPS/BD module adopts a new generation SIRFIII low-power chip and can be used for quickly and accurately positioning in places with weak satellite signals, such as urban canyons, viaducts and the like; the embedded main control module is responsible for decoding collected data, extracting speed, calculating kilometers, storing and sending.
Wireless WIFI communication module
The running kilometers of the locomotive are wirelessly uploaded to a ground server by a railway locomotive running kilometer acquisition card, and then the running kilometers of the locomotive are wirelessly uploaded by the ground server through the module. The module is a high-reliability industrial-grade and low-power-consumption embedded module. The built-in TCP/IP protocol stack can realize standard TCP/IP communication.
In the railway locomotive running kilometer acquisition card, the module works in a Client mode (correspondingly, a ground high-power wireless AP works in an AP mode), automatically searches for a ground wireless AP signal in a circulating mode after being electrified, and automatically joins the wireless AP once the signal is searched; after the module is added into the wireless AP, under the control of the main control module, TCP connection is automatically initiated to the IP address of the data server computer and a port number allocated to the locomotive (each locomotive is allocated with a unique port number on the data server, namely each locomotive has a unique ID number).
1. The technical parameters are as follows:
wireless standard: ieee802.11n, ieee802.11g, ieee802.11b.
Wired standard: IEEE802.3, IEEE802.3 u.
Wireless transmission rate:
11n is up to 150 Mbps.
11g, the maximum can reach 54 Mbps.
11b, the maximum can reach 11 Mbps.
The number of channels: 1-14.
Frequency range: 2.4-2.4835G.
Emission power: 12-15 DBM.
Antenna type: on-board/external antenna.
And (3) a WIFI working mode: Client/AP/Router.
WDS function: WDS wireless bridging is supported.
Wireless security: wireless MAC address filtering.
Wireless security function: 64/128/152 bit WEP encryption, WPA-PSK/WPA2-PSK, WPA/WPA2 security mechanism.
And remote Web management.
Configuration file import and export.
And (5) WEB software upgrading.
The highest transmission rate of the serial port is as follows: 230400 bps.
TCP connection: the maximum number of connections > 20.
UDP connection: the maximum number of connections > 20.
The serial port baud rate: 50 to 500000 bps.
Working temperature: -20-60 ℃.
Working humidity: 10% -90% RH (no coagulation).
Storage temperature: -40-80 ℃.
Storage humidity: 5% -90% RH (no coagulation).
Other properties: the frequency band bandwidth is selectable: 20MHz, 40MHz, automatic.
Second, wireless WIFI power amplification module
Because the running kilometer acquisition card of the railway locomotive is arranged in a locomotive TAX box, when the locomotive is put in storage and connected with a ground wireless AP, because a WIFI signal passes through a locomotive metal shell and the metal TAX box, the power amplification of the WIFI signal is necessary so that a main plug-in and the ground wireless AP can be reliably connected and data can be transmitted. For this purpose, a WIFI power amplification unit needs to be designed and manufactured.
The amplifying unit is internally provided with the high-speed receiving and transmitting switching automatic judging circuit, can automatically switch receiving and transmitting states, can automatically work without a WIFI control chip giving a control signal, is compatible with any WIFI occasion, and can ensure the WIFI signal transmission distance and the connection stability.
The core element of the amplification unit is RF2126 which is a high-power linear amplifier produced by RF Micro Devices, and the amplification unit adopts AN advanced gallium arsenide Heterojunction Bipolar Transistor (HBT) process, is designed for 2.5GHz ISM band final-stage linear RF amplification, such as W L AN and POS terminals, and can also be used for transmitting final-stage linear amplification like a digital PCS telephone, wherein the device has AN operating frequency of 1800-2500 MHz.RF2126, except for AN external matching network, and comprises a power supply line and a bypass capacitor, the maximum operating voltage is 7.5V, the typical value of output power is 1 W.RF2126, and the amplification unit can be used for 2.5Hz ISM band, digital communication system, PCS communication system, commercial and consumer system, portable battery power supply equipment and the like, and is packaged by double-row 8 pins, the limit operating voltage is 7.5V, and the limit operating current is 450 mA.
Three, nonvolatile power-down storage module
In order to ensure that the acquired running kilometer data is not lost when power failure occurs, an electrically erasable programmable read-only memory (EEPROM) or a Random Access Memory (RAM) with a backup battery can be adopted as a data storage mode at present. The former is simple to use, but has slow writing speed and limited writing times; the latter has fast writing speed and no writing times limitation, but is easy to lose data by external interference such as power supply voltage, and the like, but can avoid the data loss by only elaborately designing an anti-interference power supply and a backup battery circuit and a cyclic redundancy check and software fault-tolerant mechanism of the data, so the system adopts an RAM with a backup battery to store the recorded data.
1. Structural principle of memory module
Firstly, a hardware protection circuit and a power supply monitoring circuit are arranged in a storage module. When power is on or off, the chip selection signal of the internal memory with the power supply voltage less than or equal to the threshold value (selectable from 4.3V to 4.75V) is set high and automatically switched to a protection state, the hardware protection design is widely adopted by common NVRAM manufacturers, but only under the condition of the hardware protection, data loss is still caused under many conditions, and the hardware protection is not absolutely stable. For example, the power-on and power-off is too fast and too frequent, the interference in the normal working state, the electromagnetic impact is too strong, the voltage fluctuation range is too large, the writing and chip selection caused by too strong vibration are low, and the like. Therefore, the module adds a software protection function at the write signal end while protecting the hardware, the internal write signal of the chip can be opened only when the CPU writes 88 the last two bytes into a special unit of the chip, and if the two bytes are written into the 55, 00 and other numbers, the signals are locked, and no matter what interference occurs in the external write signal, the interference data can not be stored into the chip. Therefore, the reliability of the chip is improved unprecedentedly, excessive changes on software are not needed, only a write instruction is added at the beginning of the program, and a lock write instruction is added at the end. Thus being convenient and very reliable, because of higher reliability.
2. Storage module primary performance index
(1) The chip is a single 5V power supply dual in-line standard package, the pin arrangement has access operation, etc., and is identical to the same capacity SRAM (62256).
(2) The read-write times are unlimited and the service life is the same as that of the SRAM.
(3) Frequent power-down and interference tests prove that the reliability is far higher than that of general NVRAM, EEPROM, Flash and other similar and derivative products.
(4) Chip read-write speed 70 ns.
(5) The hardware protection voltage threshold is 4.75V.
(6) The temperature range is 125 ℃ on an industrial scale.
(7) The command writing byte position and the unlocking number are selectable, and the functions of encryption and interference resistance can be achieved.
Four, DC-DC isolation power supply module
The railway locomotive running kilometer acquisition card is installed in a locomotive TAX box, a working power supply of the railway locomotive running kilometer acquisition card needs to be acquired from the TAX box, and in order to avoid influencing an original TAX box to the maximum extent, the railway locomotive running kilometer acquisition card does not directly acquire power from various output power supplies provided by a TAX box bottom plate, but directly acquires power from a 110V power supply of the locomotive in an isolation mode, so that the locomotive TAX box cannot be influenced even if the power supply of the acquisition card of the system works abnormally.
When an automatic system operates, the influence of a power supply on the stability of the system is great, and a power supply module with poor quality stability can not only cause unstable operation of the system, but also can seriously cause damage to components. Therefore, the selection of a power supply module with a good design is a very important task, and particularly, the speed acquisition card of the system needs to work on a locomotive in a high-current and strong-electromagnetic-interference environment, so that the requirement on the power supply is higher. Selecting and designing a DC-DC isolation switch power supply, mainly considering the following aspects:
1. efficiency:
in the era of global advocation of high efficiency and energy saving, efficiency is an important factor for model selection, which can reduce energy consumption in the process of power supply conversion, reduce heat treatment problems and prolong the service life of modules, so the model selection of efficiency is higher and better. The loss of the system in standby is one of the issues to be paid attention in recent years, and in some applications, the proportion of the time of the system in standby state is longer, and a power module with lower standby loss is a good choice.
2. Operating temperature:
the general temperature operation can be divided into a commercial rule (0 ℃ to +60 ℃), an industrial rule (-25 ℃ to +71 ℃), a military rule (-55 ℃ to +85 ℃) and the like, and when a DC/DC power supply module is selected, the actual system operation temperature range needs to be considered, and a proper temperature grade is selected. Different temperature levels can affect the design and selection of materials used by the power supply module, and the selection of a proper temperature level is a very important consideration factor, which can affect the stability and reliability of the DC/DC power supply module. The system has a large temperature limit range because the system works in a locomotive. Especially in summer, the temperature in the locomotive is very high, so that the power supply part of the acquisition card of the system adopts components with industrial specifications.
3. Input voltage:
the input voltage refers to the range of normal operation of a DC/DC power supply module, a common power supply system is generally divided into 5V,12V,24V and 48V, and the acquisition card of the system works under the more special voltage of 110V, so that the design and the selection of components are specially treated. When the input voltage range of the power module is selected, the double-voltage input and the quadruple-voltage input can be selected according to the variation range of the input voltage. This is particularly noticeable as the input voltage may be too high or too low, which may cause the DC/DC power supply module to malfunction or break down.
4. Rated power:
in the foregoing, the extreme temperature of the working environment of the acquisition card of the system is very high in summer, so that when the power module of the acquisition card selects power, the power module is selected according to the fact that the actual power is 7-8 times of the rated power, and a sufficient power margin is reserved.
5. The working frequency is as follows:
the working frequency of the DC/DC power supply module is inversely proportional to the volume of the module but is proportional to the loss, and the higher the frequency is, the smaller the volume of the DC/DC power supply module can be, but the conversion efficiency will be reduced; otherwise, the volume is larger, but the conversion efficiency is improved. The working frequency of the power supply module is divided into two types, one is constant frequency, and the other is variable frequency. The working frequency of the fixed-frequency DC/DC power supply module is designed to be in the range of 150K-500K Hz, and the error of the frequency is usually within + -10%.
The frequency of the variable frequency DC/DC power module varies with different input voltages and load conditions.
The use of low power products, frequency conversion design is a good choice, the advantages and disadvantages of fixed frequency and frequency conversion depend on the practical application of customers, generally speaking, fixed frequency products are easier to handle EMI.
6. Isolation (Isolation):
generally, a product with a power supply on the primary side needs to have an isolation function, and the isolation can improve the safety and reliability of a system, improve the EMC characteristics and protect the secondary side. In general, the voltage of a DC/DC isolation power supply module is more required to be 1500V, and the power supply module of the system is set according to 1600V.
7. Pressure stabilization (Regulation):
the voltage stabilization refers to the stability of output voltage, the main influencing factors are input voltage and output load, and the stability of the input voltage during variation refers to the relative variation situation of the output voltage when the input voltage varies; the load variation stability refers to the stability of output voltage when the load varies; when an unregulated product is used, when the input voltage or the load condition is different, the output voltage is unstable, the system is also unstable, even rear-end parts are damaged, particularly, the influence on a storage module circuit is large, and the stored running kilometer data is possibly lost or wrong.
8. And (4) safety regulation:
because the speed acquisition card works in a TAX box of a locomotive, a communication recording card (a main control card), a TMIS card, a DMIS card, a track detection card, a bow net detection card and the like are arranged in the box, and the cards are dense, when a power supply module is selected and designed, the card is ensured not to be interfered by other cards, but also not to be interfered by other cards. The EMI (electromagnetic compatibility) of the power module must meet the international standard.
In order to ensure electromagnetic compatibility, an EMC peripheral circuit is designed at the input end of the module; similarly, in order to ensure the ripple and noise indexes of the output end and the quality of the output power supply, an output filter circuit is designed at the output end of the module;
the system comprises the following relevant parameters of a power module:
and the safety regulations of RoHS standard, U L1950 and IEC950 are met.
Metal shielded packaging, EMI compliance EN55022 Class A and FCC L evel.
Advanced circuit topology, efficiency is up to 87%.
No need of external radiating fins, stable output voltage and low standby power consumption.
The working temperature is-25 ℃ to +71 ℃.
1600V isolation voltage, short circuit, overload, internal overheat protection self-recovery.
Isolation resistor input/output 100M omega
Vibration impact of 10-55 Hz 5G
Mean Time Between Failure (MTBF) MI L-HDBK-217F 250000
Five, GPS/BD module
The railway locomotive running kilometer acquisition card is reserved with a GPS/BD positioning module for later function extension. The GPS/BD module must be small due to system space. The module is a complete satellite positioning receiving device, has an all-directional function, and can meet the strict requirement of professional positioning. The volume is small and exquisite, low-power consumption, can adapt to various harsh environment. The module adopts a new generation SIRFIII low-power chip, has ultrahigh sensitivity, and can quickly and accurately position in places with weak satellite signals, such as urban canyons, viaducts and the like.
The module recommends a peripheral circuit schematic diagram, as shown in fig. 6, which is recommended by manufacturers, but some element parameters are found to be unreasonable in actual tests. For example, in order to ensure that the positioning information and the set working parameters before the inside of the module are not lost after the external 5V working power supply of the GPS module is disconnected, an external 3V battery is required, the battery supplies power to the module with a current-limiting resistor, and if 470 ohms is selected according to a diagram, once the external 5V working power supply of the module is disconnected, the power consumption of the battery is very fast. Through actual measurement and improvement, the 20K resistor is adopted, and the external battery almost consumes no power under the condition that the GPS module information can be reliably ensured not to be lost.
Sixth, isolate RS485 communication module
The working state of the acquisition card for railway locomotive running kilometers needs to be acquired in real time, dynamic and static parameters and locomotive running information sent to a TAX box by an L KJ host are received in real time, an RS485 bus is adopted for communication from a L KJ host to the TAX box, the 485 bus is shared, once an ordinary 485 communication chip is abnormal, the whole bus cannot be communicated, the system is only an auxiliary system for locomotive application, and the design must ensure that the access of the system cannot interfere with the original 485 bus.
At the same time, the slew rate drivers of MAX1480 are able to minimize EMI and reduce reflections caused by poor matching of the communication cable, allowing error-free data transmission at data rates up to 250 kbps. This can be seen by looking at the driver output waveform and corresponding FFT plot for the 2 chips of fig. 7-8 when transmitting 150khz signals, as seen in fig. 7-8, when slew rate is not limited, very large high frequency harmonics are seen by fourier analysis.
Seven, embedded main control module
The main control module is responsible for decoding collected data, extracting speed, calculating kilometers, storing and sending. Because the calculation amount is large, the real-time requirement is high, and an STM32F4 series single chip microcomputer with an ARM core is selected.
The single chip microcomputer is characterized in that:
1. compatible with STM32F2 series products, and is convenient for users of ST to expand or upgrade products, and maintains the compatibility of hardware.
2. The high speed capability of 168MHz, integrating new DSP and FPU instructions, enables digital signal controller applications and fast product development to reach new levels. The execution speed and the code efficiency of the control algorithm are improved.
3. Advanced technology and 90nm technology
4. A memory accelerator: adaptive real-time Accelerator (ART Accelerator)TM)
5. Multiple AHB bus matrix and multiple channel DMA: support parallel processing of program execution and data transmission, and has very high data transmission rate
6. High performance, 210DMIPS @168 MHz.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a railway locomotive walks kilometer collection card which is based on locomotive TAX case and the last front and back velocity sensor I and the velocity sensor II of installing of locomotive, its characterized in that: a railway locomotive running kilometer acquisition card is inserted into a reserved standby unit slot of the locomotive TAX box, and speed data of the speed sensor I and the speed sensor II are provided for the TAX box to be broadcasted;
the railway locomotive running kilometer acquisition card comprises a wireless WIFI communication module, a wireless WIFI power amplification module, a nonvolatile power-down storage module, a DC-DC isolation power supply module, a GPS/BD module, an isolation RS485 communication module and an embedded main control module;
when the locomotive returns to the railway locomotive service section, the wireless WIFI communication module can be automatically connected with a wireless AP installed at the railway side, and then the running kilometer data of the locomotive is sent to a ground server through the wireless AP;
the wireless WIFI power amplification module is used for performing power amplification on a WIFI signal of the wireless WIFI communication module so that the railway locomotive running kilometer acquisition card and a ground wireless AP can be reliably connected and data can be transmitted;
the nonvolatile power-down storage module is used for storing recorded data; the DC-DC isolation power supply module directly takes electricity from a 110V power supply of the locomotive in an isolation mode; the GPS/BD module adopts a new generation SIRFIII low-power chip and can be used for quickly and accurately positioning in places with weak satellite signals, such as urban canyons, viaducts and the like; the embedded main control module is responsible for decoding collected data, extracting speed, calculating kilometers, storing and sending.
2. The railway locomotive running kilometer acquisition card according to claim 1, characterized in that: the wireless WIFI communication module is a high-reliability industrial-grade low-power-consumption embedded module, a TCP/IP protocol stack is arranged in the wireless WIFI communication module, and standard TCP/IP communication can be achieved.
3. The railway locomotive running kilometer acquisition card according to claim 1, characterized in that: the wireless WIFI power amplification module is internally provided with a high-speed transceiving switching automatic judging circuit, can automatically switch transceiving states, and can automatically work without a control signal given by a wireless WIFI communication module, so that the wireless WIFI power amplification module is compatible with any WIFI occasions and can ensure the WIFI signal transmission distance and the connection stability.
4. The railway locomotive running kilometer acquisition card according to claim 1, characterized in that: the nonvolatile power-down storage module is a Random Access Memory (RAM) with a backup battery, and a hardware protection circuit and a power supply monitoring circuit are arranged in the nonvolatile power-down storage module.
5. The railway locomotive running kilometer acquisition card according to claim 1, characterized in that: the isolation RS485 communication module selects an integrated and complete electrical isolation type RS485/RS422 data communication interface chip MAX1480 produced by American and American letter company, adopts a mixed microcircuit structure, and is integrated in a standard DIP28 pin package through a complete isolation interface formed by a transceiver, an optical coupler and a transformer.
6. The railway locomotive running kilometer acquisition card according to claim 1, characterized in that: the plug-in board of the 19-inch 4U case structure with the standard railway locomotive running kilometer acquisition card size completely conforms to the national standard of the mechanical structure of GB/T19520 electronic equipment in plugging, pulling and fixing.
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Application publication date: 20200717 |