CN206217922U - A kind of track axle count formula circuit shunt system - Google Patents
A kind of track axle count formula circuit shunt system Download PDFInfo
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- CN206217922U CN206217922U CN201621231533.1U CN201621231533U CN206217922U CN 206217922 U CN206217922 U CN 206217922U CN 201621231533 U CN201621231533 U CN 201621231533U CN 206217922 U CN206217922 U CN 206217922U
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Abstract
A kind of track axle count formula circuit shunt system, the four meter shaft pulse signals produced by the magnetic head formula wheel detector installed in track block section two ends, system carries out automatic discrimination to four tunnel meter shaft pulse signals, axletree to entering errant block section is counted, when the axletree quantity for entering errant block section is identical or less than error amount, make track block section Seize ACK message invalid automatically.Meter shaft pulse signal eliminates the shaking interference that unit filters narrow pulse interference and signal edge by impulse disturbances, further increases antijamming capability.And impulse disturbances filter unit filtering filtering positive burst pulse Breadth Maximum can by change forward current driver outflow driving current size or forward direction anti-interference capacitor size be adjusted；The negative burst pulse Breadth Maximum of filtering can be adjusted by the size of the outflow driving current size or reverse anti-interference capacitor that change reverse current driver.The system is used to replace existing track branch circuit.
Description
Technical field
The utility model is related to track axle count equipment technical field, especially a kind of track axle count formula circuit shunt system.
Background technology
Track circuit rail level is because the influence of bad conducting objects causes track circuit shunting badness, train or locomotive to take rail
The track relay of the track section is controlled during road can not be operating normally, and cause interlocking of signals to fail.Using axle count sensor side
During case, mechanical pick-up device produces the signal that train arrives by the break-make of spring coordination electrode contact, easily produces contact to connect
Touch bad and signal jitter interference；The infrared ray of infrared sensor is easily blocked by dust and debris, and is easily done by other illumination
Disturb generation disturbing pulse；Ultrasound piezoelectric transducer due to must it is exposed outside, it is impossible to effectively protected, while also easily receiving
To the interference effect of other barriers such as construction worker, disturbing pulse is produced；Eddy current coil sensing, magnetic head sensor sensing are easy
Influenceed by metal sundries, for example, when construction of railways personnel hold spade and slip over magnetic head sensor, easily differentiating to magnetic head and making
Into interference, disturbing pulse is exported.Above-mentioned various sensors are made when wheel enters or exits detection interval because vehicle passes through
Into sensor vibration, wheel itself vibration and the reason such as sensor itself contact chatter, will also result in transducing signal edge
Produce Vibrating pulse.
The content of the invention
In order to solve the problems, such as existing track circuit shunting badness, the utility model provides a kind of track axle count formula circuit
Branch system, including the first magnetic head formula wheel detector, the second magnetic head formula wheel detector, the 3rd magnetic head formula wheel detector,
Quadruplex videotape recorder formula wheel detector, meter shaft branching unit.
The first magnetic head formula wheel detector, the second magnetic head formula wheel detector, the 3rd magnetic head formula wheel detector,
Quadruplex videotape recorder formula wheel detector export respectively the first meter shaft pulse signal, the second meter shaft pulse signal, the 3rd meter shaft pulse signal,
4th meter shaft pulse signal.
The first meter shaft pulse signal, the second meter shaft pulse signal, the 3rd meter shaft pulse signal, the 4th meter shaft pulse letter
Number deliver to meter shaft branching unit, the meter shaft branching unit output track block section Seize ACK message.
The meter shaft branching unit includes that count pulse generation module, counter module, comparison module, reset signal are produced
Module.
The input of the count pulse generation module is the first meter shaft pulse signal, the second meter shaft pulse signal, the 3rd meter
Axle pulse signal, the 4th meter shaft pulse signal, are output as adding count pulse, subtract count pulse；It is described to add count pulse, subtract counting
Counter module is delivered in pulse；The output being input into as counter module of the comparison module, and data X；The data X is
Integer more than or equal to 1；The comparison module is output as track block section Seize ACK message；The reset signal generation module
Input be track block section Seize ACK message, be output as quenching pulse；The quenching pulse delivers to the clearing of counter module
Input.
The track axle count formula circuit shunt system also filters unit, the second impulse disturbances and filters including the first impulse disturbances
Unit, the 3rd impulse disturbances filter unit, the 4th impulse disturbances and filter unit.
The first meter shaft pulse signal, the second meter shaft pulse signal, the 3rd meter shaft pulse signal, the 4th meter shaft pulse letter
Number filter unit, the second impulse disturbances through the first impulse disturbances respectively and filter unit, the 3rd impulse disturbances and filter unit, the 4th arteries and veins
Meter shaft branching unit is delivered to again after rushing interference filtering unit filtering interfering waveform.
First impulse disturbances filter unit, the second impulse disturbances and filter unit, the 3rd impulse disturbances and filter unit,
Four impulse disturbances filter unit for structural parameters identical impulse disturbances filter unit.
The impulse disturbances filter unit includes positive charge-discharge circuit, reverse charge-discharge circuit, data selector；It is described
The input signal of positive charge-discharge circuit and reverse charge-discharge circuit filters the input pulse of unit for impulse disturbances；The data
Selector is alternative data selector；Two data input pins of the data selector are respectively connecting to positive discharge and recharge electricity
Road, the output end of reverse charge-discharge circuit；The data output end of the data selector filters the output of unit for impulse disturbances
Pulse ends；The selection control end of the data selector is connected to output pulse.
The positive charge-discharge circuit includes forward current driver, positive anti-interference capacitor, positive anti-interference Schmidt
Circuit；The input of the forward current driver is positive charge-discharge circuit input, and output is connected to positive anti-interference apply
Close special circuit input end；One end of the positive anti-interference capacitor is connected to positive anti-interference Schmidt circuit input, in addition
One end be connected to impulse disturbances filter unit publicly or power supply.
The reverse charge-discharge circuit includes reverse current driver, reversely reverse anti-interference capacitor, anti-interference Schmidt
Circuit；The input of the reverse current driver is the input of reverse charge-discharge circuit, and output is connected to reversely anti-interference
Schmidt circuit input；One end of the reverse anti-interference capacitor is connected to reverse anti-interference Schmidt circuit input, separately
Outer one end be connected to impulse disturbances filter unit publicly or power supply.
The positive anti-interference Schmidt circuit output end is positive charge-discharge circuit output end, reverse anti-interference Schmidt
Circuit output end is reverse charge-discharge circuit output end.
The beneficial effects of the utility model are：The track axle count formula circuit shunt system is entered to 4 tunnel meter shaft pulse signals
Row automatic discrimination, the axletree to entering errant block section is counted, when the axletree quantity for entering errant block section is identical
Or during less than error amount, make track block section Seize ACK message invalid automatically；Meter shaft pulse signal filters list by impulse disturbances
Unit filters the shaking interference at narrow pulse interference and signal edge, further increases the antijamming capability of system, and impulse disturbances
The positive burst pulse Breadth Maximum for filtering the filtering of unit filtering can be by changing the outflow driving current of forward current driver
The size of size or positive anti-interference capacitor is adjusted；The negative burst pulse Breadth Maximum of filtering can be by changing reversely electricity
The size of the outflow driving current size or reverse anti-interference capacitor that flow driver is adjusted.
Brief description of the drawings
Fig. 1 is magnetic head formula wheel detector installation site embodiment；
Fig. 2 is track axle count formula circuit shunt system embodiment structured flowchart；
Fig. 3 is meter shaft branching unit example structure block diagram；
Fig. 4 is the entrance logic state example ripple that the first meter shaft pulse signal and the second meter shaft pulse signal meet axletree
Shape；
Fig. 5 is the first meter shaft pulse signal and the second meter shaft pulse signal meets axletree rolls logic state example ripple away from
Shape；
Fig. 6 is the 3rd meter shaft pulse signal and the 4th meter shaft pulse signal meets axletree rolls logic state example ripple away from
Shape；
Fig. 7 is the entrance logic state example ripple that the 3rd meter shaft pulse signal and the 4th meter shaft pulse signal meet axletree
Shape；
Fig. 8 produces circuit embodiments to add count pulse or subtracting count pulse；
Fig. 9 filters unit embodiment for impulse disturbances；
Figure 10 filters the waveform of unit embodiment for impulse disturbances；
Figure 11 is forward current driver and the circuit of reverse current driver embodiment 1；
Figure 12 is forward current driver and the circuit of reverse current driver embodiment 2；
Figure 13 is forward current driver and the circuit of reverse current driver embodiment 3；
Figure 14 is counter module, comparison module, reset signal generation module embodiment；
Figure 15 is the embodiment of the Schmidt circuit with high input impedance charcteristic.
Specific embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
It is as shown in Figure 1 magnetic head formula wheel detector installation site embodiment.In Fig. 1 embodiments, the first magnetic head formula wheel
Sensor 201 is arranged on the inner side of right track 102, on axletree line B1.In locomotive, the traveling of train, work as wheel shaft
During traveler car axis B1 positions, the first magnetic head formula wheel detector 201 senses wheel and exports effective first meter shaft pulse
Signal.First magnetic head formula wheel detector 201 may be mounted at right track outside or inner side, it is also possible to installed in left track pair
Claim the outside or inner side of position, that is, necessarily be on same axletree line B1.
In Fig. 1 embodiments, the second magnetic head formula wheel detector 202 is arranged on the inner side of right track 102, in axletree line B2
On.In locomotive, the traveling of train, when wheel shaft traveler car axis B2 positions, the second magnetic head formula wheel detector 202 is felt
Wheel should be arrived and effective second meter shaft pulse signal is exported.Second magnetic head formula wheel detector 202 may be mounted at right track
Outside or inner side, it is also possible to installed in the outside or inner side of left track symmetric position, that is, necessarily be in same axletree line B2
On.
In Fig. 1 embodiments, the 3rd magnetic head formula wheel detector 203 is arranged on the inner side of right track 102, in axletree line B3
On.In locomotive, the traveling of train, when wheel shaft traveler car axis B3 positions, the 3rd magnetic head formula wheel detector 203 is felt
Wheel should be arrived and effective 3rd meter shaft pulse signal is exported.3rd magnetic head formula wheel detector 203 may be mounted at right track
Outside or inner side, it is also possible to installed in the outside or inner side of left track symmetric position, that is, necessarily be in same axletree line B3
On.
In Fig. 1 embodiments, quadruplex videotape recorder formula wheel detector 204 is arranged on the inner side of right track 102, in axletree line B4
On.In locomotive, the traveling of train, when wheel shaft traveler car axis B4 positions, quadruplex videotape recorder formula wheel detector 204 is felt
Wheel should be arrived and effective 4th meter shaft pulse signal is exported.Quadruplex videotape recorder formula wheel detector 204 may be mounted at right track
Outside or inner side, it is also possible to installed in the outside or inner side of left track symmetric position, that is, necessarily be in same axletree line B4
On.
It is illustrated in figure 2 track axle count formula circuit shunt system embodiment structured flowchart.In system shown in Figure 2 embodiment,
First magnetic head formula wheel detector 201, the second magnetic head formula wheel detector 202, the 3rd magnetic head formula wheel detector the 203, the 4th
First meter shaft pulse signal M1 of the output of magnetic head formula wheel detector 204, the second meter shaft pulse signal M2, the 3rd meter shaft pulse letter
Number M3, the 4th meter shaft pulse signal M4 are sent to meter shaft branching unit 500, the output track block section of meter shaft branching unit 500
Seize ACK message J1.
It is illustrated in figure 3 meter shaft branching unit example structure block diagram, including count pulse generation module 501, counter
Module 502, comparison module 503, reset signal generation module 504.
First magnetic head formula wheel detector 201, the second magnetic head formula wheel detector 202 are arranged on the one of track block section
Hold for detecting whether locomotive (train) enters or roll away from, the 3rd magnetic head formula wheel detector 203, quadruplex videotape recorder formula from the end
Wheel detector 204 be arranged on track block section other end be used for detect locomotive (train) whether from the end enter or
Roll away from.
It is illustrated in figure 4 the first meter shaft pulse signal and the second meter shaft pulse signal meets the entrance logic state of axletree and shows
Example waveform, Fig. 5 show the first meter shaft pulse signal and the second meter shaft pulse signal meets axletree rolls logic state example away from
Waveform.
In Fig. 1 embodiments, locomotive (train) is from the first magnetic head formula wheel detector 201, the second magnetic head formula wheel detector
During 202 installation end injection block section, first there is the first meter shaft pulse signal M1, after have the second meter shaft pulse signal M2, and
The distance of the axletree line B1 and axletree line B2 of magnetic head formula wheel detector installation site is protected less than the wheel diameter of locomotive (train)
M2 before M1 useful signals disappear has been demonstrate,proved to start effectively.Differentiate that the first meter shaft pulse signal M1 and the second meter shaft pulse signal M2 expires
The condition of the entrance logic state of sufficient axletree is：In the second meter shaft pulse signal M2 valid periods, the first meter shaft pulse signal M1
From being effectively changed into invalid.In Fig. 4, signal M1, signal M2 are Low level effective in embodiment, in the low period of signal M2
Between, signal M1 is changed into the entrance logic state that high level meets axletree from low level, plus count pulse output end H1 exports one
Plus count pulse, subtract count pulse output end L1 and do not export pulse.
Locomotive (train) is rolled away from from the installation end of 201 second magnetic head formula wheel detector of the first magnetic head formula wheel detector 202
During track block section, first there is the second meter shaft pulse signal M2, after have the first meter shaft pulse signal M1, and M2 useful signals disappear
Preceding M1 is to start effectively.Differentiate that what the first meter shaft pulse signal M1 and the second meter shaft pulse signal M2 met axletree rolls logic shape away from
The condition of state is：In the first meter shaft pulse signal M1 valid periods, the second meter shaft pulse signal M2 is from being effectively changed into invalid.Fig. 5
In, signal M1, signal M2 are Low level effective in embodiment, and between the low period of signal M1, signal M2 becomes from low level
The entrance logic state of axletree is met for high level, is subtracted count pulse output end L1 outputs one and is subtracted count pulse, plus count arteries and veins
Rush output end H1 and do not export pulse.
It is illustrated in figure 6 the 3rd meter shaft pulse signal and the 4th meter shaft pulse signal meets the logic state of rolling away from of axletree and shows
Example waveform, Fig. 7 show the 3rd meter shaft pulse signal and the 4th meter shaft pulse signal meets the entrance logic state example of axletree
Waveform.
In Fig. 1 embodiments, locomotive (train) is from the 3rd magnetic head formula wheel detector 203, quadruplex videotape recorder formula wheel detector
When 204 installation ends roll track block section away from, first there is the 3rd meter shaft pulse signal M3, after have the 4th meter shaft pulse signal M4, and
Wheel diameter of the distance of the axletree line B3 and axletree line B4 of wheel detector installation site less than locomotive (train), it is ensured that M3
M4 is to start effectively before useful signal disappears.Differentiate that the 3rd meter shaft pulse signal M3 and the 4th meter shaft pulse signal M4 meet axletree
The condition of output logic state be：In the 4th meter shaft pulse signal M4 valid periods, the 3rd meter shaft pulse signal M3 is from effective
It is changed into invalid.In Fig. 6, signal M3, signal M4 are Low level effective in embodiment, between the low period of signal M4, signal
M3 is changed into the entrance logic state that high level meets axletree from low level, subtracts count pulse output end L1 outputs one and subtracts counting arteries and veins
Punching, plus count pulse output end H1 does not export pulse.
Locomotive (train) enters from the 3rd magnetic head formula wheel detector 203, the installation end of quadruplex videotape recorder formula wheel detector 204
During track block section, first there is the 4th meter shaft pulse signal M4, after have a 3rd meter shaft pulse signal M3, and M4 useful signals disappear
Preceding M3 is to start effectively.Differentiate that what the 3rd meter shaft pulse signal M3 and the 4th meter shaft pulse signal M4 met axletree rolls logic shape away from
The condition of state is：In the 3rd meter shaft pulse signal M3 valid periods, the 4th meter shaft pulse signal M4 is from being effectively changed into invalid.Fig. 7
In, signal M3, signal M4 are Low level effective in embodiment, and between the low period of signal M3, signal M4 becomes from low level
The entrance logic state of axletree is met for high level, plus count pulse output end H1 exports one plus count pulse, subtracts counting arteries and veins
Rush output end L1 and do not export pulse.
It is illustrated in figure 8 to add count pulse or subtract count pulse and produces circuit embodiments.In Fig. 8, C51, R51, D51 group
Into differential circuit the rising edge in K2 signals can be converted to a positive pulse；Phase inverter F51 is by negative meter shaft pulse signal
Be converted to positive meter shaft pulse signal.If K1 is M2 in Fig. 8, K2 is M1, then NAND gate F52 is output as plus count pulse H11；If
K1 is M3 in Fig. 8, and K2 is M4, then NAND gate F52 is output as plus count pulse H12；Plus count pulse H11, plus count pulse
H12 is negative pulse；In count pulse generation module 501, any one has in adding count pulse H11, adding count pulse H12
When negative pulse is exported, plus count pulse H1 output negative pulses.
If K1 is M1 in Fig. 8, K2 is M2, then NAND gate F52 is output as subtracting count pulse L11；If K1 is M4 in Fig. 8,
K2 is M3, then NAND gate F52 is output as subtracting count pulse L12；Subtract count pulse L11, subtract count pulse L12 and be negative arteries and veins
Punching；In count pulse generation module 501, any one has negative pulse to export in subtracting count pulse L11, subtracting count pulse L12
When, subtract count pulse L1 output negative pulses.
Counter module 502 is forward-backward counter, and its CP+ is input into add count pulse input, CP- to subtract count pulse
End.The output Q of counter module 502 delivers to comparison module 503.If the X in Fig. 3 is equal to 1；As the output Q of counter module 502
During more than 1, the track block section Seize ACK message J1 of output effectively, illustrates that track block section has locomotive (train)；J1 is effective
When control track relay coil losing electricity, connect red light circuit or make semaphore show barrier it is forbidden.When counter module 502
Output Q be less than or equal to 1 when, the track block section Seize ACK message J1 of output is invalid, illustrates that track block section does not have locomotive
(train)；Control track relay coil to obtain electric when J1 is invalid, connect green light circuit or semaphore is shown that safety is passed through.X
During for allowing that accidental mistake (having accidental disturbing pulse or pulse missing) occurs in axle-counting signal, track block section takes letter
Number J1 can normally send.X is bigger, and it is bigger that it allows that accidental wrong permission occurs in axle-counting signal.In counter module 502
R be clear input.Comparison module 503 is compared to its 2 input datas, when input data DA is more than input data DB
When, the track block section Seize ACK message J1 of output is effective；When input data DA is less than or equal to input data DB, the rail of output
Block section Seize ACK message J1 is invalid in road.
Reset signal generation module 504 track block section Seize ACK message from be effectively changed into invalid when, time delay produce one
Individual quenching pulse makes the output of counter module 502 be changed into 0.It is equal to as a example by 1 by X, when the output of counter module 502 becomes from 2
For 1 when, from being effectively changed into invalid, the time delay of reset signal generation module 504 produces a clearing to track block section Seize ACK message
Pulse makes the output of counter module 502 be changed into 0.Under normal circumstances, when locomotive (train) passes through track block section, counter
The output of module 502 can add the axletree quantity for counting up to locomotive (train) from 0, counting is then subtracted again and returns 0.Time delay produces one clearly
The effect of zero pulse is：Under normal circumstances, if when the output of counter module 502 is changed into 1 from 2, track block section takes
Signal from be effectively changed into invalid when, locomotive still has axletree in track block section, and now reset signal generation module 504 is produced at once
A raw quenching pulse makes the output of counter module 502 be changed into 0, then the remaining axletree of locomotive (train) rolls track block section away from
Between after, the output of counter module 502 subtracts 1 from 0, wrong meter shaft result occurs, and the output error of comparison module 503 can be caused to sentence
Disconnected result.If time delay certain hour is again exported to counter module 502 quenching pulse, after making the time delay of counter module 502
Again clear 0, if ensure the time of time delay roll track block section away from than the remaining axletree of locomotive (train) required for time it is long,
After then locomotive (train) whole axletree rolls track block section away from, counter module 502 is output as 0, it is ensured that the system pair
The normal meter shaft of next locomotive (train).When accidental mistake (having accidental disturbing pulse or pulse missing) occurs in axle-counting signal,
After locomotive (train) whole axletree rolls track block section away from, the output of counter module 502 is less than or equal to X, and reset signal is produced
Raw module 504 track block section Seize ACK message from be effectively changed into invalid when, time delay produces the quenching pulse to make counter
The output of module 502 is changed into 0 from the value less than or equal to X, can equally ensure the system to the normal of next locomotive (train)
Meter shaft.
The function of meter shaft branching unit can be realized using various middle scale logic circuits, can also using CPLD,
The devices such as FPGA, PAL, GAL are realized.
It is illustrated in figure 9 impulse disturbances and filters unit embodiment, including impulse disturbances filter unit and include positive discharge and recharge
Circuit, reverse charge-discharge circuit, data selector.In Fig. 9 embodiments, forward current driver, positive anti-interference capacitor, forward direction
Anti-interference Schmidt circuit is respectively current driver U11, electric capacity C11, Schmidt circuit F11, constitutes positive discharge and recharge electricity
Road；Reverse current driver, reverse anti-interference capacitor, reverse anti-interference Schmidt circuit are respectively current driver U21, electric capacity
C21, Schmidt circuit F21, constitute reverse charge-discharge circuit.The input of the one termination Schmidt circuit F11 of electric capacity C11,
Other end is connected to publicly；The input of the one termination Schmidt circuit F21 of electric capacity C21, other end is connected to public
Ground.P1 is input pulse end, and P2 is output pulse ends.
In Fig. 9 embodiments, data selector T11 is alternative data selector, and two data input signals are believed with output
All it is same phase relation between number, Schmidt circuit F11, Schmidt circuit F21 are then respectively with phase Schmidt circuit and anti-phase apply
Close special circuit, therefore, it is same phase relation, data selection between data selector T11 outputs and Schmidt circuit F11 input signals
It is inverted relationship that device T11 is exported and Schmidt circuit F21 input signals between.The function of data selector T11 is：When selection is controlled
During end A=0 processed, Y=D1 is exported；When control end A=1 is selected, Y=D2 is exported.Output end Y (the i.e. arteries and veins of data selector T11
Rush output end P2) the selection control end A of data selector T11 is connected directly to, when output pulse P2 is low level, control data
The output signal A3 of selector T11 selection Schmidt circuits F11 is sent to the output end Y of data selector；Output pulse P2 is height
During level, the output signal A4 of control data selector T11 selection Schmidt circuits F21 is sent to the output end Y of data selector.
Figure 10 filters the waveform of unit embodiment, including input pulse P1 and Schmidt circuit F11 outputs for impulse disturbances
A3, Schmidt circuit F21 output A4, the waveform of output pulse P2.In Fig. 9, when input pulse P1 is maintained low level for a long time
When, A1 points are low level, and the output A3 of Schmidt circuit F11 is low level；When input pulse P1 is maintained high level for a long time
When, A1 points are high level, and A3 is high level.When input pulse P1 becomes low level from high level, current driver U11's is defeated
Go out A1 and be immediately turned into low level current potential, A3 becomes low level from high level immediately.When input pulse P1 becomes electricity high from low level
Usually, the driving current that A1 current potentials are exported by current driver U11 charges and rises to electric capacity C11, when charging between reach T1,
When the rising of A1 current potentials meets and exceeds the upper limit threshold voltage of Schmidt circuit F11, A3 becomes high level from low level；When P1's
Positive pulse width is less than T1, and the charging interval is less than T1, and P1 is i.e. when A1 current potentials are not up to the upper limit threshold voltage of Schmidt circuit F11
Become low level, A1 current potentials are immediately turned into low level current potential, and A3 maintains low level state.In Figure 10, the original state of P1 and A3
It is low level.Positive burst pulse 11, positive burst pulse 12, the width of positive burst pulse 13 are respectively less than T1, and A1 current potentials cannot be charged to
Or the upper limit threshold voltage more than Schmidt circuit F11, A3 states are not influenceed；The width of the positive pulse 14 of P1 is more than T1,
Therefore, after the rising edge in the positive pulse 14 of P1 crosses time T1, A3 is changed into high level from low level.The decline of the positive pulse 14 of P1
Along making A3 be changed into low level from high level, the width of the positive pulse 15 of P1 is more than T1, after the rising edge of positive pulse 15 crosses time T1,
A3 is changed into high level from low level.The trailing edge of P1 positive pulses 15 makes A3 be changed into low level from high level, the positive pulse 16 of P1, just
Pulse 17, the width of positive pulse 18 are respectively less than T1, therefore, positive pulse 16, positive pulse 17, positive pulse 18 do not influence on A3, A3
Maintain low level state.The width of the positive pulse 19 of P1 is more than T1, and after the rising edge of positive pulse 19 crosses time T1, A3 is from low level
It is changed into high level.
In Fig. 9, when input pulse P1 is maintained low level for a long time, A2 points are high level, and Schmidt circuit F21's is defeated
Go out A4 for low level；When input pulse P1 is maintained high level for a long time, A2 points are low level, and A4 is high level.Work as input
Pulse P1 from low level become high level when, the output A2 of current driver U21 is immediately turned into low level current potential, and A4 is immediately from low
Level becomes high level.When input pulse P1 becomes low level from high level, the drive that A2 current potentials are exported by current driver U21
Streaming current charges to electric capacity C21 and rises, when charging between reach T2, the rising of A2 current potentials reaches the upper limit of Schmidt circuit F21
During threshold voltage, A4 becomes low level from high level；When the negative pulse width of P1 is less than T2, the charging interval is less than T2, A2 current potentials
When not rising the upper limit threshold voltage for reaching Schmidt circuit F21, P1 is to become high level, and A2 is immediately turned into low level current potential,
A4 maintains high level state.In Figure 10, the original state of P1 and A4 is low level.The rising edge of the positive pulse 11 of P1 makes A4 from low
Level is changed into high level, and the width of the negative pulse 20 of P1 is more than T2, and after the trailing edge of negative pulse 20 crosses time T2, A4 is from high level
It is changed into low level.The rising edge of the positive pulse 12 of P1 makes A4 be changed into high level from low level, the negative pulse 20 of P1, negative pulse 21
Width is respectively less than T2, therefore, negative pulse 20, negative pulse 21 do not influence on A4, and A4 maintains low level state.It is negative pulse 23, negative
Pulse 24, negative pulse 25, the width of negative pulse 26 are respectively less than T2, and A2 current potentials cannot be charged to or higher than Schmidt circuit
The upper limit threshold voltage of F21, does not influence on A4 states；The width of the negative pulse 27 of P1 is more than T2, therefore, in the negative pulse of P1
After 27 trailing edge crosses time T2, A4 is changed into low level from high level.In the rising edge of the negative pulse 27 of P1, A4 becomes from low level
It is high level.
The output A3 of Schmidt circuit F11 input pulse P1 be low level when keep low level, input pulse P1 by
Time T1 excessively is just changed into high level after low level is changed into high level.The output A4 of Schmidt circuit F21 is height in input pulse P1
High level is kept during level, time T2 is crossed after input pulse P1 is changed into low level from high level and is just changed into low level.In other words,
When A3 is high level, A4 must be high level；When A4 is low level, A3 must be low level.
In Figure 10, the original state of A3, A4 is low level, and the output Y of data selector T11 is low level, data choosing
Device T11 selection A3 are selected as output Y and in A3 for low level period maintains.When A3 is changed into high level at edge 30 from low level
When, output Y is changed into high level, and data selector T11 selects A4 as output Y, and now A4 must be high level, maintain output Y
High level state.When A4 is changed into low level at edge 31 from high level, output Y is changed into low level, data selector T11 choosings
A3 is selected as output Y, now A3 must be low level, maintain the low level state of output Y.When A3 becomes at edge 32 from low level
During for high level, output Y is changed into high level, and data selector T11 selects A4 as output Y, and now A4 must be high level, dimension
Hold the high level state of output Y.
Impulse disturbances filter unit by the burst pulse 11 in P1 signals, burst pulse 12, burst pulse 13, burst pulse 23, narrow arteries and veins
Punching 24, burst pulse 25, burst pulse 26 is all filtered out, and positive broad pulse 14 (including positive pulse 14, positive pulse 15, positive pulse 16, just
Pulse 17 and positive pulse 18, negative pulse 23, negative pulse 24, negative pulse 25, negative pulse 26 are disturbing pulse), the negative energy of broad pulse 27
Enough pass through, make corresponding positive broad pulse 28 and negative broad pulse 29 occur in P2 signals.The output same phases of pulse P2 and input pulse P1,
And the rising edge of broad pulse 28 for exporting is than the rising edge lag time T1 of positive broad pulse 14, trailing edge lag time T2 of input.
Positive pulse 11, positive pulse 12, positive pulse 13 be positive burst pulse, wherein positive pulse 11 be disturbing pulse, positive pulse 12,
Positive pulse 13 is continuous Vibrating pulse.Time T1 filters the positive narrow pulse width of maximum that unit can be filtered for impulse disturbances.
T1 is the positive charge time.The outflow driving current size of the current driven device U11 of T1, the low electricity of current driver U11
Ordinary telegram position, the upper limit threshold voltage joint effect of electric capacity C11 sizes, Schmidt circuit F11.Under normal circumstances, the value of T1 is adjusted
Can be carried out by changing the outflow driving current size and electric capacity C11 sizes of current driver U11.
Negative pulse 23, negative pulse 24, negative pulse 25, negative pulse 26, wherein negative pulse 23 be disturbing pulse, negative pulse 24,
Negative pulse 25, negative pulse 26 are continuous Vibrating pulse.The maximum that time T2 can be filtered for impulse disturbances filter unit is born narrow
Pulse width.T2 is the reverse charging time.Outflow driving current size, the current driver of the current driven device U21 of T2
The low level current potential of U21, electric capacity C21 sizes, the upper limit threshold voltage joint effect of Schmidt circuit F21.Under normal circumstances, adjust
The value of whole T2 can be carried out by changing the outflow driving current size and electric capacity C21 sizes of current driver U21.
In Fig. 9, one end that electric capacity C11 connects publicly can filter the power supply end of unit with reconfiguration in impulse disturbances；
Similarly, electric capacity C21 connect publicly one end can also individually or together with electric capacity C11 reconfiguration filters unit in impulse disturbances
Power supply end.
In Fig. 9, Schmidt circuit F11, Schmidt circuit F21 can also simultaneously or separately select anti-phase Schmidt's electricity
Road, can also be simultaneously or separately inverted relationship between input D1, D2 and output Y of data selector T11.When Schmidt's electricity
Road F11, Schmidt circuit F21 simultaneously or separately select anti-phase Schmidt circuit, input D1, D2 of data selector T11 with
, it is necessary to meet following condition when being simultaneously or separately inverted relationship between output Y, i.e.,：When data selector T11 exports Y
When being same phase relation between Schmidt circuit F11 forward direction charge-discharge circuit input signals, data selector T11 exports Y and applies
It is inverted relationship between close special circuit F21 input signals；The now output of the low level control selection Schmidt circuit F11 of Y is sent
To the output end of data selector T11, the output of the high level control selections Schmidt circuit F21 of Y is sent to data selector T11
Output end.When it is inverted relationship that data selector T11 is exported between Y and Schmidt circuit F11 input signals, data selection
It is same phase relation that device T11 is exported between Y and Schmidt circuit F21 input signals；Now the low level control selection Schmidt of Y is electric
The output of road F21 is sent to the output end of data selector T11, and the output of the high level control selections Schmidt circuit F11 of Y is sent to
The output end of data selector T11.
Figure 11 is forward current driver and the circuit of reverse current driver embodiment 1.Open-drain output driven in phase device
F12, resistance R11 constitute forward current driver.When P1 is low level, driven in phase device F12 outputs A1 is low level；P1 is height
During level, driven in phase device F12 is open-drain output, and power supply+VCC flows out driving current through resistance R11.
Open-drain output rp-drive F22, resistance R21 constitute reverse current driver.When P1 is high level, anti-phase driving
Device F22 outputs A2 is low level；When P1 is low level, rp-drive F22 is open-drain output, and power supply+VCC flows through resistance R21
Go out driving current.
Driven in phase device F12, rp-drive F22 can select the integrated circuit of various open collectors, open-drain.
Figure 12 is forward current driver and the circuit of reverse current driver embodiment 2.Triode V21, resistance R22, electricity
Resistance R23 composition reverse current drivers, when P1 is high level, triode V21 saturation conductions, reverse current driver exports A2 and is
Low level；When P1 is low level, triode V21 cut-offs, power supply+VCC flows out driving current through resistance R22.
Triode V11, triode V12, resistance R12, resistance R13, resistance R14 composition forward current drivers, P1 is low
During level, triode V12 cut-offs, triode V11 saturation conductions, forward current driver output A1 is low level；P1 is electricity high
Usually, triode V12 saturation conductions, triode V11 cut-offs, power supply+VCC flows out driving current through resistance R12.In Figure 12 three
The negative circuit of pole pipe V12, resistance R14 composition can also be substituted with other phase inverters.
In Figure 12, the outflow driving current that forward current driver and reverse current driver are provided not is constant size
Driving current.
Figure 13 is forward current driver and the circuit of reverse current driver embodiment 3.Triode V25, triode V26,
Voltage-stabiliser tube D25, resistance R25, resistance R26 composition reverse current drivers, wherein, triode V26, voltage-stabiliser tube D25, resistance R25
Constitute reverse constant-current circuit.When P1 is high level, triode V25 saturation conductions, reverse current driver output A2 is low level；
When P1 is low level, triode V25 cut-offs, power supply+VCC flows out constant current driving current through triode V26.
Triode V15, triode V16, triode V17, voltage-stabiliser tube D15, resistance R15, resistance R16, resistance R17 compositions are just
To current driver, wherein, triode V16, voltage-stabiliser tube D15, the positive constant-current circuit of resistance R15 compositions.When P1 is low level, three
Pole pipe V17 ends, triode V15 saturation conductions, and forward current driver output A1 is low level；When P1 is high level, three poles
Pipe V17 saturation conductions, triode V15 cut-offs, power supply+VCC flows out constant current driving current through triode V16.Three poles in Figure 13
The negative circuit of pipe V17, resistance R17 composition can also be substituted with other phase inverters.
Figure 14 show counter module, comparison module, reset signal generation module embodiment.In Figure 14, F81, F82 are equal
It is 4 binary synchronous forward-backward counter 74HC193, collectively forms counter module.In F81, F82, CPU counts input to add
End, to subtract counting input end, TCU is add carry pulse output end to CPD, and to subtract carry pulse output end, CR has TCD for high level
The clear input of effect, LD is the data initialization control signal of Low level effective, and D3, D2, D1, D0 are input into for preset data
End, Q3, Q2, Q1, Q0 are terminal count output.TCU, TCD of F81 be respectively connecting to CPU, CPD of F82, and F81, F82 are cascading
Mode collectively forms 8 binary synchronous forward-backward counters, and meter shaft scope is up to 255, wherein, the counting output Q3 of F81,
Q2, Q1, Q0 are 8 and count the low 4 of output, and counting output Q3, Q2, Q1, Q0 of F82 are 8 and count the high 4 of output, he
Collectively constitute the output Q of Fig. 3 embodiment Counters module 502.The LD ends of F81, F82 directly input high level, i.e. LD
Disarmed state is in, now what level D3, D2, D1, D0 of F81, F82 can take over, in Figure 14 embodiments, F81, F82's
D3, D2, D1, D0 are connected to low level.CPU, CPD of F81 is respectively CP+, CP- signal end of counter module.F81、F82
CR ends link together, constitute counter module clear input R.
In Figure 14, F83, F84 are 4 binary comparator 74HC85, collectively form comparison module.In F83, F84,
A3, a2, a1, a0 are that 4 binary systems relatively count A inputs, and b3, b2, b1, b0 are that 4 binary systems relatively count B inputs；YA<B、YA=B、
YA>BFor the comparative result of A, B is exported, IA<B、IA=B、IA>BLow level comparative result input during for cascade.In Figure 14, the output of F83
YA<B、YA=B、YA>BIt is respectively connecting to the corresponding input I of F84A<B、IA=B、IA>B, 8 binary comparators are constituted, F83 is low by 4
Position, F84 is high 4；Comparing number A inputs a3, a2, a1, a0 of F83, F84 collectively constitute the input of comparison module 503 in Fig. 3
Data DA, is connected to 8 binary systems output of counter module；Comparing number B inputs b3, b2, b1, b0 of F83, F84 are common
The input data DB of comparison module 503 in composition Fig. 3, input data X, Tu14Zhong, 8 bit binary data X are equal to 1；F84's is defeated
Go out YA>BIt is the track block section Seize ACK message J1 of comparison module output.When the output of counter module is more than X, compare mould
Effectively, J1 effective statuses are high level to the track block section Seize ACK message J1 of block output；When the output of counter module is less than
During equal to X, the track block section Seize ACK message J1 of comparison module output is invalid, and J1 disarmed states are low level.
In Figure 14, not gate F85, resistance R81, resistance R82, electric capacity C81, electric capacity C82, diode D81, diode D82 groups
Into reset signal generation module, not gate F85 selection phase inverters 74HC06.Not gate F85 can also select cmos schmitt phase inverter
74HC14.Resistance R81, electric capacity C81, diode D81 composition trailing edge delay circuits, the trailing edge of not gate F85 inputs can compare J1
There is delay, time delay is determined by the product of resistance R81, electric capacity C81；Resistance R82, electric capacity C82, diode D82 composition differential
Circuit, a positive pulse is converted to by the rising edge that not gate F85 is exported；Not gate F85 plays shaping and phase transition.In Figure 14
Reset signal generation module track block section Seize ACK message J1 from be effectively changed into invalid when, i.e., J1 trailing edge it
Afterwards, a positive quenching pulse is produced in J2 time delays, the output of F81, F82 in counter module is changed into 0.
The positive anti-interference Schmidt circuit, reversely anti-interference Schmidt circuit are Schmidt circuit, input signal
It is the voltage on electric capacity, it is therefore desirable to Schmidt circuit has high input impedance charcteristic.Schmidt circuit can select have height
Cmos schmitt phase inverter CD40106,74HC14 of input impedance characteristic, or selection have high input impedance charcteristic
The devices such as cmos schmitt NAND gate CD4093,74HC24.Cmos schmitt phase inverter or cmos schmitt NAND gate it is upper
Limit threshold voltage is the fixed value related to device.Constituted with phase Schmidt electricity with schmitt inverter or Schmidt's NAND gate
Road behind schmitt inverter or Schmidt's NAND gate, it is necessary to increase one-level phase inverter.
Figure 15 show the embodiment of the Schmidt circuit with high input impedance charcteristic, wherein, Figure 15 (a) is mutually to apply together
Close special circuit, Figure 15 (b) is anti-phase Schmidt circuit.F91, F93 cmos schmitt of the selection with high input impedance charcteristic are anti-
Phase device 74HC14, F92 selection phase inverter 74HC06.
Schmidt circuit is also an option that using operational amplifier to constitute, and Schmidt's electricity is constituted using operational amplifier
Road can neatly change upper limit threshold voltage, lower limit threshold voltage.Similarly, Schmidt's electricity is constituted using operational amplifier
, it is necessary to using structure and circuit with high input impedance charcteristic during road.
Data selector can select the devices such as 74HC151,74HC152,74HC153, CD4512, CD4539 to constitute two choosings
One data selector, it is also possible to constitute alternative data selector with gate circuit.
Schmidt circuit, data selector can also be used together CPLD, FPGA to realize its work(with meter shaft branching unit
Energy.
Claims (5)
1. a kind of track axle count formula circuit shunt system, it is characterised in that：
Including the first magnetic head formula wheel detector, the second magnetic head formula wheel detector, the 3rd magnetic head formula wheel detector, the 4th magnetic
Hair style wheel detector, meter shaft branching unit；
The first magnetic head formula wheel detector, the second magnetic head formula wheel detector, the 3rd magnetic head formula wheel detector, the 4th magnetic
Hair style wheel detector exports the first meter shaft pulse signal, the second meter shaft pulse signal, the 3rd meter shaft pulse signal, the 4th respectively
Meter shaft pulse signal；
The first meter shaft pulse signal, the second meter shaft pulse signal, the 3rd meter shaft pulse signal, the 4th meter shaft pulse signal send
To meter shaft branching unit, the meter shaft branching unit output track block section Seize ACK message.
2. track axle count formula circuit shunt system according to claim 1, it is characterised in that：
The meter shaft branching unit includes that count pulse generation module, counter module, comparison module, reset signal produce mould
Block；
The input of the count pulse generation module is the first meter shaft pulse signal, the second meter shaft pulse signal, the 3rd meter shaft arteries and veins
Signal, the 4th meter shaft pulse signal are rushed, is output as adding count pulse, subtracted count pulse；
Described plus count pulse, subtract count pulse and deliver to counter module；
The output being input into as counter module of the comparison module, and data X；The data X is whole more than or equal to 1
Number；
The comparison module is output as track block section Seize ACK message；
The input of the reset signal generation module is track block section Seize ACK message, is output as quenching pulse；The clearing
The clear input of counter module is delivered in pulse.
3. track axle count formula circuit shunt system according to claim 2, it is characterised in that：
Also unit, the second impulse disturbances being filtered including the first impulse disturbances and filtering unit, the 3rd impulse disturbances filter unit, the 4th
Impulse disturbances filter unit；
The first meter shaft pulse signal, the second meter shaft pulse signal, the 3rd meter shaft pulse signal, the 4th meter shaft pulse signal point
Not through the first impulse disturbances filter unit, the second impulse disturbances filter unit, the 3rd impulse disturbances filter unit, the 4th pulse do
Disturb and deliver to meter shaft branching unit again after filtering unit filtering interfering waveform.
4. track axle count formula circuit shunt system according to claim 3, it is characterised in that：
First impulse disturbances filter unit, the second impulse disturbances and filter unit, the 3rd impulse disturbances and filter unit, the 4th arteries and veins
Interference filtering unit is rushed for structural parameters identical impulse disturbances filter unit；
The impulse disturbances filter unit includes positive charge-discharge circuit, reverse charge-discharge circuit, data selector；
The input signal of the positive charge-discharge circuit and reverse charge-discharge circuit filters the input pulse of unit for impulse disturbances；
The data selector is alternative data selector；Two data input pins of the data selector are respectively connecting to
The output end of positive charge-discharge circuit, reverse charge-discharge circuit；
The data output end of the data selector filters the output pulse ends of unit for impulse disturbances；The data selector
Selection control end is connected to output pulse.
5. track axle count formula circuit shunt system according to claim 4, it is characterised in that：The positive charge-discharge circuit
Including forward current driver, positive anti-interference capacitor, positive anti-interference Schmidt circuit；The forward current driver it is defeated
It is positive charge-discharge circuit input to enter end, and output is connected to positive anti-interference Schmidt circuit input；It is described positive anti-dry
The one end for disturbing electric capacity is connected to positive anti-interference Schmidt circuit input, and other end is connected to impulse disturbances and filters unit
Publicly or power supply；
The reverse charge-discharge circuit includes reverse current driver, reversely reverse anti-interference capacitor, anti-interference Schmidt circuit；
The input of the reverse current driver is the input of reverse charge-discharge circuit, and output is connected to reverse anti-interference Schmidt
Circuit input end；One end of the reverse anti-interference capacitor is connected to reverse anti-interference Schmidt circuit input, other end
Be connected to impulse disturbances filter unit publicly or power supply；
The positive anti-interference Schmidt circuit output end is positive charge-discharge circuit output end, reverse anti-interference Schmidt circuit
Output end is reverse charge-discharge circuit output end.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620578326 | 2016-06-15 | ||
| CN2016205783267 | 2016-06-15 |
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| CN206217922U true CN206217922U (en) | 2017-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621231533.1U Expired - Fee Related CN206217922U (en) | 2016-06-15 | 2016-11-16 | A kind of track axle count formula circuit shunt system |
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| CN (1) | CN206217922U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426217A (en) * | 2019-08-09 | 2019-11-08 | 哈尔滨市科佳通用机电股份有限公司 | A kind of fault handling method based on wheel sensor signal processing unit |
| CN111845850A (en) * | 2020-07-28 | 2020-10-30 | 尹永云 | Subway track monitoring circuit |
| CN117246375A (en) * | 2023-10-07 | 2023-12-19 | 温州市铁路与轨道交通投资集团有限公司 | Electromagnetic interference filtering method and device for axle counting equipment and axle counting equipment |
-
2016
- 2016-11-16 CN CN201621231533.1U patent/CN206217922U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426217A (en) * | 2019-08-09 | 2019-11-08 | 哈尔滨市科佳通用机电股份有限公司 | A kind of fault handling method based on wheel sensor signal processing unit |
| CN110426217B (en) * | 2019-08-09 | 2020-09-11 | 哈尔滨市科佳通用机电股份有限公司 | Fault processing method based on wheel sensor signal processing device |
| CN111845850A (en) * | 2020-07-28 | 2020-10-30 | 尹永云 | Subway track monitoring circuit |
| CN111845850B (en) * | 2020-07-28 | 2022-03-29 | 山西世恒铁路技术有限公司 | Subway track monitoring circuit |
| CN117246375A (en) * | 2023-10-07 | 2023-12-19 | 温州市铁路与轨道交通投资集团有限公司 | Electromagnetic interference filtering method and device for axle counting equipment and axle counting equipment |
| CN117246375B (en) * | 2023-10-07 | 2024-04-26 | 温州市铁路与轨道交通投资集团有限公司 | Electromagnetic interference filtering method and device for axle counting equipment and axle counting equipment |
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