CN1314562C - Controller local network bus type structure and digitallized rail detecting device - Google Patents
Controller local network bus type structure and digitallized rail detecting device Download PDFInfo
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- CN1314562C CN1314562C CNB2003101127181A CN200310112718A CN1314562C CN 1314562 C CN1314562 C CN 1314562C CN B2003101127181 A CNB2003101127181 A CN B2003101127181A CN 200310112718 A CN200310112718 A CN 200310112718A CN 1314562 C CN1314562 C CN 1314562C
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Abstract
The present invention relates to a controller local network bus type structure and digitized rail detecting device characterized in that an impedance adjusting section is added in a receiving circuit, a communication converting unit adopts a TJA1040T module, and a multifunctional digital display unit adopts two serial input and parallel output latches and a digital code display piece TOM2481 to form a display panel with the function of four-digit display. The system accuracy rate of the device is enhanced by more than 30%, the performance of system communication is largely improved, reliability and interference-free performance are obviously enhanced, the user's requirement for telecommunication is satisfied conveniently, and direct communication distance can reach 10 KM more or less; the present invention adopts the four-digit display panel so as to have a friendly and intuitional interface.
Description
Technical field
The present invention relates to detect the line idle in rail yard, interval etc. or the detecting device of occupancy, and can be used as the secondary detection device of the interchange rail sensor of signal monitoring systems such as railway signal interlocking system and dispatcher's supervision system, centralized traffic control.
Background technology
By the application of bus-structured digitized track condition checkout gear in computer interlock system, solve taking and series of technical such as idle real-time detection, centralized interlocking control, bus digital communication of a station track, promptly disclose a kind of digitized track detecting device of bus organization as Chinese patent CN2419129.And along with this system further apply expansion with applicable area, said apparatus demonstrates the deficiency of some aspects; At first, this Design of device precision can not satisfy the use needs, can not unify to set and online adjustment to the threshold value of incoming signal, can not accurately judge the insulation status and the superpressure situation of signal circuit, promptly is subjected to the resolution of electric signal not high; Secondly, during greater than 1KM, its bus just needs the adjunction repeater in the direct communication distance.If when adopting passive repeater, along with the increase signal of distance has tangible decay, make obstacle overcome ability reduce, traffic rate and reliability all are affected.If the employing active repeater has then increased the requirement of field wiring and has strengthened difficulty of construction and brought inconvenience to the user; Its obstacle overcome ability did not have clear superiority when its bus was used under harsh environment simultaneously.Showing link, the actual occupancy that originally reflected track with two light-emitting diodes, it can't intactly show the measured value of track incoming signal and the parameters such as threshold value of track condition, concerning the field maintemance personnel, shown quantity of information exists certain limitation and inconvenient factor.
Summary of the invention
The purpose of this invention is to provide that the linear match and regulate function of a kind of track incoming signal is strong, disturbance rejection, Controller Area Network BUS formula structure and digitized track detecting device that directly communication distance is farther, reliability is higher.
The technical solution that realizes above-mentioned purpose is as follows:
The digitized track detecting device, comprise control module coding input block, programmable logic controller (PLC) interface unit, be subjected to electric circuit unit, multifunctional signal collector, Central Processing Unit (CPU), communication converting unit, real-time diagnosis modular unit and multifunctional digital display unit, it is characterized in that:
A, described being subjected in the circuit behind transformer parallel impedance matched resistance R12 and pizo-resistance R11, are connected with the resistance R 10 that is connected on transformer; The other end of resistance R 10 is incoming junction A, and resistance R 12, R11 transformation pri points of common connection are incoming junction B;
B, described communication converting unit adopt the TJA1040T module, and wherein pin one is connected with the pin 3 of Central Processing Unit (CPU) module, and pin 4 is connected with the pin two of Central Processing Unit (CPU) module, and pin 8 is connected with the pin one 9 of Central Processing Unit (CPU) module; Be attempted by again between the pin 7,6 of module after resistance R 40 and the R41 series connection, the common port of resistance R 40, R41 is connected with the pin 5 of TJA1040T module, be connected in series an electric capacity R24 again between the point of connection of the pin 5 of described common port and TJA1040T module and the ground, form the Controller Area Network BUS transceiver;
After C, described multifunctional digital display unit adopted two to seal in and go out series of latches, its mouth was connecting the input end of digital displaying block TOM2481 respectively, has formed the display panel with 4-digit number Presentation Function;
Connect pull down resistor respectively on the pin 4,5,6 of A/D converter TLC0834 in D, the described multifunctional signal collector unit, and be connected on the pairing pin of extension socket, form the detection input channel of current/voltage compatibility.
Described impedance match resistance R 12 is an adjustable resistance.
The present invention has the advantage of several respects by improvements over the prior art:
1, to being subjected to the improvement of circuit, increased the impedance adjustment link of input circuit, rate of accurateness has improved more than 30%.
2, improve back system communication performance and improve greatly, reliability and obstacle overcome ability obviously improve, and have satisfied the customer requirements of long haul communication easily, and directly communication distance can reach about 10KM.
3, the present invention has the display panel of 4-digit number Presentation Function.Wherein represent the numbering of track or electric weight with one-bit digital, three can accurately show the signal voltage measured value in addition, friendly interface, directly perceived.
4, utilize the multi-channel function of TLC0834, as long as make the user that the requirement of spread signal be arranged, just measured signal directly can be guided on the pairing pin of P1 socket, owing to improved the Presentation Function of system, make state and the information originally can't show, now just can demonstrate intuitively and accurately expand and import for information about.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention,
Fig. 2 is schematic circuit diagram of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is further described by embodiment.
The present invention is improvements over the prior art, concrete Technological improvement plan is such, referring to Fig. 1, this Controller Area Network BUS formula structure and digitized track detecting device comprise control module coding input block, programmable logic controller (PLC) interface unit, are subjected to electric circuit unit, multifunctional signal collector, Central Processing Unit (CPU), communication converting unit, real-time diagnosis modular unit and multifunctional digital display unit.
Referring to Fig. 2, in being subjected to circuit, behind transformer parallel impedance matched resistance R12 and the pizo-resistance R11, connect with the resistance R 10 that is connected on transformer; The other end of resistance R 10 is incoming junction A, and resistance R 12, R11 transformation pri points of common connection are incoming junction B.
To being subjected to the improvement of circuit, increased the impedance adjustment link of input circuit, by adjusting adjustable resistance R12, can adapt to the requirement of peripheral hardware interface circuit impedance match aspect flexibly.In addition by regulating variable resistance R13, just the railway voltage between 0-30V can be fitted to an ideal line section with certain slope and intercept, thereby guarantee to make the track input voltage to drop on each aspect of ideal line section, guaranteed the design accuracy of system, resolution is brought up to 0.1V after the improvement from original 1V.Rate of accurateness has improved more than 30%.
The communication converting unit adopts the TJA1040T module, and wherein pin one is connected with the pin 3 of Central Processing Unit (CPU) module, and pin 4 is connected with the pin two of Central Processing Unit (CPU) module, and pin 8 is connected with the pin one 1 of Central Processing Unit (CPU) module; Be attempted by again between the pin 7,6 of TJA1040T module after resistance R 40 and the R41 series connection, the common port of resistance R 40 and R41 is connected with the pin 5 of TJA1040T module, be connected in series an electric capacity R24 again between point of connection and the ground between the pin 5 of described common port and TJA1040T module, form the Controller Area Network BUS transceiver.
Because the direct communication of original circuit distance can only reach 1KM, then not only increased the trouble point as increasing active repeater halfway, and strengthened difficulty of construction, its communication reliability also is affected, thereby change at present circuit in the communication at the scene first-selected controller local area network communication circuit, be called for short the CAN bus communication, both key distinctions are as follows:
| RS-485 | The CAN bus | |
| The direct communication cable length | 1KM | 10KM |
| The terminal voltage of communication cable | -7V～12V | -27V～40V |
| Highest communication speed | 2.5Mbps | 1Mbps |
| The output mode | Ternary | But Remote Wake Up |
This shows, adopt the direct communication cable length of CAN bus to exceed 10 times than RS-485.Terminal voltage on the bus exceeds nearly four times, so that the obstacle overcome ability of this bus strengthens than RS-485 is many.Though traffic rate is slow than RS-485, because this system does not have the mass data transmission, existing traffic rate meets the demands far away.
After the multifunctional digital display unit adopted two to seal in and go out series of latches, its mouth was connecting the input end of digital displaying block TOM2481 respectively, has formed the display panel with 4-digit number Presentation Function.Wherein represent the numbering of track or electric weight with one-bit digital, three can accurately show the signal voltage measured value in addition.
Connect pull down resistor respectively on the pin 4,5,6 of A/D converter TLC0834 in the multifunctional signal collector unit, and be connected on the pairing pin of extension socket, form the detection input channel of current/voltage compatibility.
Utilize the multi-channel function of TLC0834, CH1, CH2, CH3 are connected respectively on the pairing pin of extension socket P1, insert pull down resistor simultaneously respectively, the detection input channel of forming the current/voltage compatibility, as long as the user has the requirement of spread signal, just measured signal directly can be guided on the pairing pin of P1 socket, owing to improved the Presentation Function of system, make state and the information originally can't show, now just can demonstrate intuitively and accurately expand and import for information about.
The principle of work of this device is as follows:
In schematic circuit diagram, U1 is a cpu chip, and U2 is a WatchDog Timer, and U3 is the A/D conversion chip, U4 is the CAN bus transceiver, and U5 incorporates into to go here and there out conv, and U7A, U7B, U7C are optical coupling isolators, Y is a crystal oscillator, and U8, U7 seal in and go out latch, and U9 is a group of four figures telltale.
Track receiving voltage (0-30VAC) enters the elementary of isolating transformer TR1 through resistance R 10, R11, behind TR1 from secondary output (amplitude is about 0-30VAC), TR1 secondary output voltoge amplitude behind rectifying and wave-filtering behind the rectifier bridge BRG1 is about 0 ~ 40VDC, vdc is through R13 and R14 dividing potential drop, pressure drop is controlled in the 0-5V scope on R14, there have stabilivolt D5 to carry out simultaneously to be clamped, prevents that high pressure from sealing in late-class circuit.R14 voltage enters the analog voltage input CH0 of A/D converter U3 after U7C level of light lotus root, R24 is an isolation resistance therebetween, resistance R 23, R25 is a pull down resistor, light lotus root U7C is elementary to connect by the secondary level output of the control signal U7C of relevant connection system outlet with light lotus root U7B is elementary, A/D converter U3 is in the sheet choosing of CPU, under the control of clock and input/output signal, convert the CH0 end aanalogvoltage of U3 to 8 position digital codings, and the P9 by U3, the P13 port reads in the internal RAM unit of CPU, after reading in railway voltage, CPU controls by internal processes, and does following processing:
A. judge at first the track resistance value of reading in drops in predefined which section threshold interval of program, situation according to port P6, P7 input trigging pulse determines whether port P8, the P9 of U1 export dynamically time survey signal again, if then exporting when dropping on unoccupied section dynamically to return, the pressure value surveys signal, all the other situations are then exported dead level, return and survey signal is given the relevant connection system control module through T3, T4 time survey port;
B. program is according to the voltage swing that reads in, and port P1.7, P12, P13 by U1 export the magnitude of voltage of the track condition of representative to digital display panel;
C. whether program is served communication bus with port P6, the P7 of railway voltage value by CAN bus transceiver U4 according to system electricity affair supervisor indication decision and is read for system's electricity affair supervisor;
D. according to U7C level when closing, whether the pressure value that micro controller system reads in is zero to detect whether fault of A/D converter and peripheral components, and then reports to the police, and makes system's failure to the safe side side.
The signal of cpu port P6, P7 is formed after optocoupler U7A, U7B conversion by the control signal that the relevant connection system control module sends; The formation of address information is behind the CPU electrification reset, and under programming control, P18, the P15 by U1, P3 read in the inner calculated address of CPU sign indicating number with P3, P4, P5, P6, P10, P11, P12, P13, the P14 institute bonded assembly level state information of U5.
Owing to adopt bus architecture, need the identification circuit signal, the geocoding of digitized track state detection circuit is 8, its effective identification range is 0-255, even also can satisfy the demand for control of field, large-scale station, in this circuit layout, in order to solve the interchangeability problem of circuit, adopted on socket to make the circuit of insertion obtain information by the mode that preestablishes coded message, promptly after circuit inserted socket and energising operation, CPU read in the geocoding of this circuit automatically.
CPU controls WatchDog Timer U2 by port P18, P17, P16, make the procedure operation of WatchDog Timer as prescribed, prevent the program fleet of CPU, if the CPU program fleet then the P7 human hair combing waste of WatchDog Timer by U2 go out the P1 pin that reset signal is given CPU, make program enter normal operation.
Monitoring modular is used for the operation irregularity situation of observation circuit, and this circuit is achieved in conjunction with watchdog circuit by software; By the CAN bus communication chip realization relevant connection system of a slice special use and the data communication between the circuit, the maximum load adaptive capacity of this chip is 256 parallel uses, not only can satisfy the power system capacity requirement, also can take precautions against electromagnetic interference and field failure effectively and isolate.
The main difficulty that constitutes digitalized fault-safety track state detection circuit with micro controller system and electronic circuit is that the fault of electronic circuit is a symmetry class, thereby also just can't guarantee when fault the level state that the export orientation of circuit can be determined, some technical measures below therefore in this circuit layout, having adopted:
Realize effective isolation of testing circuit and on-site signal, adopting input impedance in circuit is the signal of 480 Ω, gather voltage transformer testing circuit and on-site signal are isolated, adopt anti-high pressure such as PTV, PTR, anti-overflow to cause circuit to damage to prevent fault simultaneously in the voltage transformer prime from the recovery and protection element; Adopt the above optocoupler of the withstand voltage 1500V of primary and secondary to isolate between testing circuit and the relevant connection system, taken into account the protection demand of part rail yard employing direct current drive locomotive; Power lead, on-site signal input line, data bus all adopt multiple twin to disturb to reduce.
The signal logic expression-form that circulates in the testing circuit is carried out conversion, express the hazardous side state of representative " line idle " with impulse singla, express the secure side state of representative " line holding " with dead level, the probability of static state is very big because impulse singla lead when fault, thereby can effectively solve the dangerous influence that " 0 " or " 1 " fault of fixed logic type is brought to testing circuit.
A/D modular converter input port to testing circuit carries out timer-controlled self-inspection, controlled by the synchronisation source trigging pulse of system's input, testing circuit regularly carries out self check to the A/D input port, especially check the corresponding situation of A/D output when on-the-spot incoming signal is 0V, guarantee the safety of hazardous side incoming signal; Also used watchdog circuit with monitoring facilities running condition in the circuit simultaneously, made circuit export orientation safety when breaking down.
This device detects the upper edge of the triggering control signal of relevant connection system by the interruption input mode, output with this start-up circuit, the switching rate of serial a/d chip position can reach 17 μ s/bit, even the influence of consideration circuit self check time-delay factor etc., integrated circuit time-delay output is no more than 0.1ms, well below the required about 20ms of former relay contact adhesive, can improve the real-time that track condition detects greatly.
Claims (2)
1, digitized track detecting device, comprise control module coding input block, programmable logic controller (PLC) interface unit, be subjected to electric circuit unit, multifunctional signal collector, Central Processing Unit (CPU), communication converting unit, real-time diagnosis modular unit and multifunctional digital display unit, it is characterized in that:
A, described being subjected in the circuit behind transformer parallel impedance matched resistance R12 and pizo-resistance R11, are connected with first resistance R 10 that is connected on transformer; The other end of first resistance R 10 is incoming junction A, and the points of common connection of impedance match resistance R 12, pizo-resistance R11 and transformer is incoming junction B;
B, described communication converting unit adopt the TJA1040T module, wherein the pin one of TJA1040T module is connected with the pin 3 of Central Processing Unit (CPU) module, the pin 4 of TJA1040T module is connected with the pin two of Central Processing Unit (CPU) module, and the pin 8 of TJA1040T module is connected with the pin one 1 of Central Processing Unit (CPU) module; Be attempted by again between the pin 7 and pin 6 of TJA1040T module after the 3rd resistance R 40 and 41 series connection of the 4th resistance R, the common port of the 3rd resistance R 40, the 4th resistance R 41 is connected with the pin 5 of TJA1040T module, be connected in series an electric capacity R24 again between point of connection between the pin 5 of described common port and TJA1040T module and the ground, form the Controller Area Network BUS transceiver;
After C, described multifunctional digital display unit adopted two to seal in and go out series of latches, two mouths that seal in and go out latch were connecting the input end of digital displaying block TOM2481 respectively, have formed the display panel with 4-digit number Presentation Function;
Connect pull down resistor respectively on the pin 4 of A/D converter TLC0834 in D, the described multifunctional signal collector, pin 5, the pin 6, and be connected on the pairing pin of extension socket, form the detection input channel of current/voltage compatibility.
2, digitized track detecting device according to claim 1 is characterized in that: described impedance match resistance R 12 is adjustable resistance.
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| CNB2003101127181A CN1314562C (en) | 2003-12-23 | 2003-12-23 | Controller local network bus type structure and digitallized rail detecting device |
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| CNB2003101127181A CN1314562C (en) | 2003-12-23 | 2003-12-23 | Controller local network bus type structure and digitallized rail detecting device |
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| CN1314562C true CN1314562C (en) | 2007-05-09 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2840929A1 (en) * | 1978-09-20 | 1980-04-03 | Siemens Ag | Detectors for tram track section signals - use busy and free signal interlocks for two following track sections (NL 24.3.80) |
| CN2104797U (en) * | 1991-10-23 | 1992-05-20 | 上海铁道学院 | Electronic high voltage pulsive circuit devive of railway track |
| JPH06144227A (en) * | 1992-10-30 | 1994-05-24 | East Japan Railway Co | Vehicle on-rail position detecting device |
| CN2419129Y (en) * | 2000-04-07 | 2001-02-14 | 魏臻 | Digital rail inspecting device with bus style structure |
-
2003
- 2003-12-23 CN CNB2003101127181A patent/CN1314562C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2840929A1 (en) * | 1978-09-20 | 1980-04-03 | Siemens Ag | Detectors for tram track section signals - use busy and free signal interlocks for two following track sections (NL 24.3.80) |
| CN2104797U (en) * | 1991-10-23 | 1992-05-20 | 上海铁道学院 | Electronic high voltage pulsive circuit devive of railway track |
| JPH06144227A (en) * | 1992-10-30 | 1994-05-24 | East Japan Railway Co | Vehicle on-rail position detecting device |
| CN2419129Y (en) * | 2000-04-07 | 2001-02-14 | 魏臻 | Digital rail inspecting device with bus style structure |
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Application publication date: 20050105 Assignee: HEFEI GOCOM INFORMATION &TECHNOLOGY Co.,Ltd. Assignor: Wei Zhen Contract record no.: 2015340000077 Denomination of invention: Controller local network bus type structure and digitallized rail detecting device Granted publication date: 20070509 License type: Exclusive License Record date: 20150611 |
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