CN104386091A - Rail traffic safety control circuit and system - Google Patents
Rail traffic safety control circuit and system Download PDFInfo
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- CN104386091A CN104386091A CN201410489955.8A CN201410489955A CN104386091A CN 104386091 A CN104386091 A CN 104386091A CN 201410489955 A CN201410489955 A CN 201410489955A CN 104386091 A CN104386091 A CN 104386091A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
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Abstract
The invention relates to a rail traffic safety control circuit. The rail traffic safety control circuit comprises safety relays for controlling corresponding signal equipment, wherein the safety relays are controlled through control units. The safety control circuit at least comprises two channel control units; each channel control unit comprises a processing unit, an output unit corresponding to the processing unit and connected with the safety relays, and a dynamic/static recovery unit; and the safety control circuit further comprises reference signal generation units for providing reference signals to the control units. As the dynamic/static recovery units are arranged in the rail traffic control circuit, the processing units can recover and compare the output results to determine the circuit control so as to improve the accuracy of the whole circuit.
Description
Technical field
The present invention relates to field of track traffic, particularly relate to safety control circuit and safety control system in a kind of track traffic.
Background technology
In track field of traffic control, generally, its Safety output controls outside safety relay by Direct driver thus controls corresponding signalling set (as the trackside equipment such as signal, switch machine and the mobile unit such as pull-in control system, car door).Generally, Safety output system external provides certain voltage thus outside relay excitation is picked up or loss of excitation falls and then control outward sign equipment.And well-known, relay excitation picks up and often represents a kind of precarious position, if the outside relay excitation that makes of Safety output system mistake picks up, probably causes the accident that derail or collision etc. are very serious.
At present, the ubiquitous Safety output of industry controls there are two kinds, and one is Static output mode, and when namely needing externally to export, providing directly to outside relay can the voltage that picks up of excitation.Another kind of mode is dynamical output mode, when namely needing externally to export, export the impulse singla of certain frequency, utilize pulse to capacitor charging, then be that relay is powered by electric capacity, the state utilizing the asymmetry of discharge and recharge to make capacitance voltage can maintain outside relay excitation can be kept to pick up.
For two kinds of Safety output modes that industry generally adopts, analyze the defect that it exists below respectively.Greatest problem existing for the first way of output is can not Timeliness coverage when adhesion fault appears in output circuit, causes system mistake to export, thus may cause the generation of dangerous situation.Specific explanations is as follows: 1. when system externally exports " 1 " for a long time, namely outside relay remains on excitation and picks up state, now output circuit sticks together fault, output state and the system output state of circuit are consistent, adhesion fault cannot be detected, and when system needs externally to export " 0 ", because circuit sticks together fault and cause exporting " 0 ", cause the generation of dangerous situation; 2. when system externally exports " 0 " for a long time, namely outside relay remains on loss of excitation full state, now output circuit sticks together fault, although Safety output adopts multi-channel to export voting mechanism usually inside track traffic, when only have a passage stick together fault time system external output can not change, but system cannot detect this fault, As time goes on, the another one passage output circuit of voting passage also there occurs identical adhesion fault, thus cause system mistake externally to export, finally may cause the generation of dangerous situation.The greatest problem that the second way of output exists is that the reliabilty and availability of system reduces greatly, adds maintenance cost.Realize owing to adopting the output form of dynamic discharge and recharge externally exporting, with regard to need repeatedly discharge and recharge is carried out to output capacitance, and repeated charge can cause the electric capacity life-span greatly to be reduced, for one piece of output board card, the output capacitance fault of any one delivery channel all can cause whole output board card unavailable, thus causes system unavailable.In actual applications, delivery channel is often many, thus causes the reliability of whole system not high, and the service intervals of system is short, improves maintenance cost.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of track traffic safety control circuit and safety control system that a kind of control circuit is simple, reliability is high, maintenance cost is low.
In order to solve above technical matters, a kind of track traffic safety control circuit of the present invention, comprise the safety relay for controlling corresponding signal equipment, described safety relay is controlled by control unit, wherein, described safety control circuit at least comprises the control unit of two passages, each channel control unit comprises a processing unit, corresponding with described processing unit and connect the output unit of described safety relay, and a sound state back production unit, described safety control circuit also comprises the reference signal generation unit for providing reference signal to described control unit.
Preferably, the sound state back production unit input end of each passage connects the mouth of other passage output units, and the mouth of the sound state back production unit of each passage connects the processing unit of this passage.
Preferably, the output unit of each passage comprises one for driving the output photoelectric coupled switch of relay.
Preferably, the sound state back production unit of each passage comprises a triple gate and provides the back production photoelectric coupling switch of signal to described triple gate Enable Pin.
Preferably, the input anode tap electrical connection processing unit of output photoelectric coupled switch, the input cathode terminal of output photoelectric coupled switch is electrically connected ground connection, the output collector terminal of output photoelectric coupled switch connects VCC, the output emitter terminal electrical connection relay of output photoelectric coupled switch is electrically connected the input anode of back production photoelectric coupling switch simultaneously, the input negative ground of back production photoelectric coupling switch, the collecting electrode of back production photoelectric coupling switch as triple gate Enable Pin and connect pull-up resistor, the grounded emitter of back production photoelectric coupling switch.
Preferably, the input cathode terminal electrical connection processing unit of output photoelectric coupled switch, the input anode tap electric connection of power supply VCC of output photoelectric coupled switch, the output collector terminal of output photoelectric coupled switch connects ground, the output emitter terminal electrical connection relay of output photoelectric coupled switch is electrically connected the input negative electrode of back production photoelectric coupling switch simultaneously, the input anode of back production photoelectric coupling switch meets VCC, back production photoelectric coupling switch emitter as triple gate Enable Pin and connect pull down resistor, the collecting electrode of back production photoelectric coupling switch is electrically connected ground connection.
A kind of track traffic safety control system, described system comprises: reference signal generation unit, processing unit, output unit, sound state back production unit, wherein, described processing unit comprises detection pulses generation module, output module, short-time pulse decoder module and static decoder module in short-term.
Preferably, rail safety control system performs following steps:
Described reference signal generation unit produces a square-wave signal;
The described pulses generation module that detects in short-term produces the shorter pulse of detection in short-term of a time length in the edge (positive rise or falling edge) of described square-wave signal;
Described processing module is coupled in the output signal according to the condition selecting that current needs export and detects pulse in short-term accordingly;
Whether the back production signal of sound state back production unit collection is decoded by short-time pulse decoder module, detect in back production signal to comprise and detect pulse in short-term, to determine whether output circuit sticks together;
Static decoder module is decoded according to the back production signal of described square-wave signal to the collection of sound state back production unit, confirm that whether the dynamic pulse signal detecting impulse singla corresponding with output in short-term comprised in back production signal within complete cycle is consistent, to confirm the normal work of circuit.
Preferably, described reference signal generation unit produces dutycycle is the square-wave signal of 50%.
Preferably, the frequency of described square-wave signal is f, 10Hz≤f≤200Hz.
By arranging sound state back production unit in track transport control circuit, making processing unit can carry out back production contrast to the result exported, thus determining the control of circuit, improving the accuracy of whole circuit.By in the edge (positive rise or falling edge) of square-wave signal, setting detects pulse in short-term, and this detection signal is coupled on output control signal, utilize in rear end processing unit to this detect in short-term impulse singla carry out decoding detect contrast, according to difference decoding principle of contrast, can to the fault detection of circuit, determine relay adhesion or circuit cannot export, prevent fault from accumulating and mistake output, improve system safety, and circuit is simple, reliability is high.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the circuit diagram of the embodiment of track traffic safety control circuit of the present invention and system;
Fig. 2 is the pulse sequence of the detection in short-term schematic diagram of the embodiment of track traffic safety control circuit of the present invention and system;
Fig. 3 is processing unit output logic " 1 " time diagram of the embodiment of track traffic safety control circuit of the present invention and system;
Fig. 4 is processing unit output logic " 0 " time diagram of the embodiment of track traffic safety control circuit of the present invention and system;
Fig. 5 is the partial circuit figure of the embodiment of track traffic safety control circuit of the present invention and system;
Fig. 6 is the graph of a relation between the signal of the embodiment of track traffic safety control circuit of the present invention and system;
Fig. 7 is the graph of a relation between the signal of the embodiment of track traffic safety control circuit of the present invention and system.
Detailed description of the invention
Embodiment:
A kind of track traffic safety control circuit of the present invention, comprise the safety relay for controlling corresponding signal equipment, described safety relay is controlled by control unit, wherein, described safety control circuit at least comprises the control unit of two passages, each channel control unit comprises a processing unit, corresponding with described processing unit and connect output unit and a sound state back production unit of described safety relay, and described safety control circuit also comprises the reference signal generation unit for providing reference signal to described control unit.The sound state back production unit input end of each passage connects the mouth of other passage output units, and the mouth of the sound state back production unit of each passage connects the processing unit of this passage.
As shown in Figure 1, in the present embodiment, described safety control circuit comprises A and B two control units, wherein, control unit A comprises processing unit A, output unit A (1), sound state back production unit A (3), and control unit B comprises processing unit B, output unit B (2), sound state back production unit B (4).Described processing unit A controls output unit A output control relay signal, described processing unit B controls described output unit B output control relay signal, described sound state back production unit A connects output unit B, back production is carried out to the output signal of output unit B and is transferred to processing unit A, described sound state back production unit B connects output unit A, carries out back production and be transferred to processing unit B to the output signal of output unit A.
The output unit of each passage comprises one for driving the output photoelectric coupled switch of relay.The sound state back production unit of each passage comprises a triple gate and provides the back production photoelectric coupling switch of signal to described triple gate Enable Pin.
As shown in Figure 1, the input anode tap electrical connection processing unit A of the output photoelectric coupled switch in output unit A, the input cathode terminal of the output photoelectric coupled switch in output unit A is electrically connected ground connection, the output collector terminal of the output photoelectric coupled switch in output unit A connects VCC, the output emitter terminal electrical connection relay of the output photoelectric coupled switch in output unit A is electrically connected the input anode of the back production photoelectric coupling switch in sound state back production unit B simultaneously, the input negative ground of the back production photoelectric coupling switch in sound state back production unit B, the collecting electrode of the back production photoelectric coupling switch in sound state back production unit B as triple gate Enable Pin and connect pull-up resistor, the grounded emitter of the back production photoelectric coupling switch in sound state back production unit B.
The input cathode terminal electrical connection processing unit of the output photoelectric coupled switch in output unit B, the input anode tap electric connection of power supply VCC of the output photoelectric coupled switch in output unit B, the output collector terminal of the output photoelectric coupled switch in output unit B connects ground, the output emitter terminal electrical connection relay of the output photoelectric coupled switch in output unit B is electrically connected the input negative electrode of the back production photoelectric coupling switch in sound state back production unit A simultaneously, the input anode of the back production photoelectric coupling switch in sound state back production unit A meets VCC, back production photoelectric coupling switch emitter in sound state back production unit A as triple gate Enable Pin and connect pull down resistor, the collecting electrode of the back production photoelectric coupling switch in sound state back production unit A is electrically connected ground connection.
Certainly, need emphasize at this, the concrete connection of circuit is to form corresponding loop, to carry out the detection of signal, such as when processing unit output signal connects the mouth of output unit, connect input anode or the negative electrode of photoelectrical coupler by current-limiting resistance, after it is determined, the connection of its other end also will be determined, only need when processing unit output signal, the front end of output unit can produce corresponding signal and carry out control to rear end and export.Same principle, output unit can be selected to export at emitter or collecting electrode, and similar situation also adapts in sound state back production unit, and therefore, physical circuit does not repeat them here.
Based on the control system of the present embodiment middle orbit safety traffic control circuit, described system comprises: reference signal generation unit, processing unit, output unit, sound state back production unit, wherein, described processing unit comprises detection pulses generation module, output module, short-time pulse decoder module and static decoder module in short-term, and rail safety control system performs following steps:
Described reference signal generation unit produces a square-wave signal;
The described pulses generation module that detects in short-term produces the shorter pulse of detection in short-term of a time length at described square-wave signal edge (positive rise or falling edge);
Described processing module is coupled in the output signal according to the condition selecting that current needs export and detects pulse in short-term accordingly;
Whether the back production signal of sound state back production unit collection is decoded by short-time pulse decoder module, detect in back production signal to comprise and detect pulse in short-term, to determine whether output circuit sticks together;
Static decoder module is decoded according to the back production signal of described square-wave signal to the collection of sound state back production unit, confirm that whether the dynamic pulse signal detecting impulse singla corresponding with output in short-term comprised in back production signal within complete cycle is consistent, to confirm the normal work of circuit.
The present embodiment Reng Yi mono-tunnel exports two passages and illustrates,
The effect of reference signal generation unit be produce dutycycle be 50% square-wave signal for the treatment of unit A and processing unit B carry out synchronization check and accordingly signal produce dynamic pulse output circuit detected.The frequency of this signal not should too high should be too not low yet, the too high system that causes frequently carries out synchronization check detection, and system treatment effeciency can be made to reduce; Underfrequency can cause dynamic pulse output detections time gap longer, and the fault reaction time is oversize.This s-f higher than 200Hz, should not be not less than 10Hz and is advisable, and for preventing Hz noise, should not choose the frequency values of power frequency or power frequency multiple, and if domestic power frequency is 50Hz, U.S.'s power frequency is 60Hz.
Safety control system operating process of the present invention is described in detail, and concrete operation step is as follows:
1, the pulses generation module that detects in short-term of processing unit (processing unit A and/or processing unit B) produces short-time pulse detection signal according to the reference signal of reference signal generation unit;
2, processing unit (processing unit A and/or processing unit B) judges the state (0 or 1) needing externally output at present;
3, the output module of processing unit (processing unit A and/or processing unit B) exports the logic level signal of the short-time pulse detection signal that has been coupled to output unit;
4, the dynamic pulse decoder module of processing unit (processing unit A and/or processing unit B) gathers short-time pulse by sound state back production unit (processing unit B and/or processing unit A) and detects data;
5, the static decoder module of processing unit (processing unit A and/or processing unit B) gathers Static Detection data by sound state back production unit (processing unit B and/or processing unit A);
6, the dynamic Static Detection data collected are sent to another processing unit by processing unit;
7, processing unit (processing unit A and/or processing unit B) compare detection data that two processing units collect whether with the state consistency preset, unanimously then carry out next round operation, inconsistent then by export orientation safety signal.
Key of the present invention is processing unit, is responsible for detecting the generation of pulse and the decoding of back production signal in short-term, and processing unit inside can be divided into detects pulses generation module, output module, short-time pulse decoder module and static decoder module in short-term.Respectively the module of key is described below.
Detect pulses generation module in short-term:
This module produces one according to the Sref signal of reference signal generation unit and detects pulse in short-term.Concrete grammar is: when positive rise or the falling edge of Sref signal, produces the pulse of detection in short-term that a time length is shorter.In the present embodiment, A channel produces when Sref signal positive rise and detects impulse singla in short-term, and channel B produces when Sref signal falling edge and detects impulse singla in short-term.Phase relation between short-time pulse detection signal and reference signal Sref as shown in Figure 2.In figure, T is cycle reference signal, and Ti is the time length detecting impulse singla in short-term.Ti is a very crucial parameter, selects inappropriate value can cause the misoperation (when such as excitation picks up, loss of excitation falls) of outside relay, and Ti generally selects according to the outside actual relay connected, and generally should be less than 1ms.In Fig. 2, S1, S2 are that A channel detects impulse singla in short-term; S3, S4 are that channel B detects impulse singla in short-term.
Output module:
Output module to be coupled corresponding detection signal in the output signal according to the current condition selecting exported that needs, and in the present embodiment, concrete principles in coupling is:
If external output logic " 1 ", namely need outside relay excitation to pick up, then A channel output signal needs the S2 signal in coupling Fig. 2, and channel B output signal needs the S3 signal be coupled in Fig. 2.Output circuit normally works, and when not having adhesion fault to occur, the output signal of A channel and channel B as shown in Figure 3.In figure, OUTA is A channel output signal, and OUTB is channel B output signal.
If external output logic " 0 ", namely need outside relay loss of excitation to fall, then A channel output signal needs the S1 signal in coupling Fig. 2, and channel B output signal needs the S4 signal be coupled in Fig. 2.Output circuit normally works, and when not having adhesion fault to occur, the output signal that A channel and B lead to as shown in Figure 4.In figure, OUTA is A channel output signal, and OUTB is channel B output signal.
Dynamic pulse decoder module:
The effect of dynamic pulse decoder module is decoded to back production signal, so that processing unit confirms whether output circuit there occurs adhesion fault.
Circuit is known as shown in Figure 1, A channel back production electric circuit inspection be whether channel B output circuit sticks together, and channel B back production electric circuit inspection is whether A channel output circuit sticks together.According to Fig. 3 and Fig. 4, A channel should carry out short-time pulse detection when the falling edge of reference signal, and channel B should carry out short-time pulse detection when the positive rise of reference signal.
The present embodiment is described in detail to dynamic pulse decoder module for A channel.A channel dynamic pulse decoder module as shown in Figure 5.Processing unit gathers the presence or absence of channel B short-time pulse by the Enable Pin exporting OUTA signal control triple gate, OUTA signal is the dynamic pulse signal with coded message, if processing unit can detect the dynamic pulse signal corresponding with OUTA in the time window residing for short-time pulse, then think that short-time pulse detects to pass through, otherwise short-time pulse detection is not passed through.OUTA signal and the relation between channel B output signal and reference signal be (the corresponding externally output logic " 1 " of channel B output signal) as shown in Figure 6, and for convenience of explanation, the short pulse signal that in figure, channel B exports amplifies.The Cleaning Principle of channel B is identical with A channel, repeats no more here.Detection pulse herein can select 8bit, 16bit or 32bit code signal, can also add CRC check code after code signal.In order to prevent mutually disturbing between passage, also different code signals can be adopted to different passages.
Static decoder module:
Static decoder module decoding to back production signal according to cycle reference signal, whether the actual output of output circuit for confirmation exports consistent with expection.The present embodiment is still described for the static decoder module of A channel.Back production circuit is see Fig. 5.Processing unit gathers the presence or absence of channel B output signal by the Enable Pin exporting OUTA signal control triple gate, OUTA signal is the dynamic pulse signal with coded message, if processing unit can detect the dynamic pulse signal corresponding with OUTA in a complete cycle reference signal, then think that actual output exports consistent with expection, otherwise think that actual output exports inconsistent with expection.OUTA signal and the relation between channel B output signal and reference signal be (the corresponding externally output logic " 1 " of channel B output signal) as shown in Figure 7.The Cleaning Principle of channel B is identical with A channel, repeats no more here.Detection pulse herein can select 8bit, 16bit or 32bit code signal, can also add CRC check code after code signal.In order to prevent mutually disturbing between passage, also different coded systems can be adopted to different passages.The crucial part of static decoder module is which kind of coded system no matter OUTA signal adopt, the bit wide of every bit code signal will much larger than the width (more than 4 times) detecting pulse in short-term, and processing unit will be avoided when carrying out signal sampling detecting pulse time window in short-term.
By arranging sound state back production unit in track transport control circuit, making processing unit can carry out back production contrast to the result exported, thus determining the control of circuit, improving the accuracy of whole circuit.By in the edge (positive rise or falling edge) of square-wave signal, setting detects pulse in short-term, and this detection signal is coupled on output control signal, again rear end utilize processing unit this detect in short-term impulse singla carry out decoding detect contrast, according to difference decoding principle of contrast, can to the fault detection of circuit, determine relay adhesion or circuit cannot export, prevent fault from accumulating and mistake output, improve system safety, and circuit is simple, reliability is high.
It is emphasized that protection scope of the present invention is including but not limited to above-mentioned detailed description of the invention.It should be pointed out that for a person skilled in the art, under the premise without departing from the principles of the invention, can also make some distortion and improvement, these also should be regarded as belonging to protection scope of the present invention.
Claims (10)
1. a track traffic safety control circuit, comprise the safety relay for controlling corresponding signal equipment, described safety relay is controlled by control unit, it is characterized in that: described safety control circuit at least comprises the control unit of two passages, each channel control unit comprises a processing unit, corresponding with described processing unit and connect output unit and a sound state back production unit of described safety relay, and described safety control circuit also comprises the reference signal generation unit for providing reference signal to described control unit.
2. track traffic safety control circuit according to claim 1, it is characterized in that: the sound state back production unit input end of each passage connects the mouth of other passage output units, the mouth of the sound state back production unit of each passage connects the processing unit of this passage.
3. track traffic safety control circuit according to claim 2, is characterized in that: the output unit of each passage comprises one for driving the output photoelectric coupled switch of relay.
4. track traffic safety control circuit according to claim 3, is characterized in that: the sound state back production unit of each passage comprises a triple gate and provides the back production photoelectric coupling switch of signal to described triple gate Enable Pin.
5. track traffic safety control circuit according to claim 4, it is characterized in that: the input anode tap electrical connection processing unit of output photoelectric coupled switch, the input cathode terminal of output photoelectric coupled switch is electrically connected ground connection, the output collector terminal of output photoelectric coupled switch connects VCC, the output emitter terminal electrical connection relay of output photoelectric coupled switch is electrically connected the input anode of back production photoelectric coupling switch simultaneously, the input negative ground of back production photoelectric coupling switch, the current collection of back production photoelectric coupling switch as triple gate Enable Pin and connect pull-up resistor, the grounded emitter of back production photoelectric coupling switch.
6. track traffic safety control circuit according to claim 4, it is characterized in that: the input cathode terminal electrical connection processing unit of output photoelectric coupled switch, the input anode tap electric connection of power supply VCC of output photoelectric coupled switch, the output collector terminal of output photoelectric coupled switch connects ground, the output emitter terminal electrical connection relay of output photoelectric coupled switch is electrically connected the input negative electrode of back production photoelectric coupling switch simultaneously, the input anode of back production photoelectric coupling switch meets VCC, the electric Enable Pin as triple gate of back production photoelectric coupling switch emitter also connects pull down resistor, the collecting electrode of back production photoelectric coupling switch is electrically connected ground connection.
7. a track traffic safety control system, described system comprises: reference signal generation unit, processing unit, output unit, sound state back production unit, is characterized in that: described processing unit comprises detection pulses generation module, output module, short-time pulse decoder module and static decoder module in short-term.
8. track traffic safety control system according to claim 7, is characterized in that: rail safety control system performs following steps:
Described reference signal generation unit produces a square-wave signal;
The described pulses generation module that detects in short-term produces the shorter pulse of detection in short-term of a time length in the edge (positive rise or falling edge) of described square-wave signal;
Described processing module is coupled in the output signal according to the condition selecting that current needs export and detects pulse in short-term accordingly;
Whether the back production signal of sound state back production unit collection is decoded by short-time pulse decoder module, detect in back production signal to comprise and detect pulse in short-term, to determine whether output circuit sticks together;
Static decoder module is decoded according to the back production signal of described square-wave signal to the collection of sound state back production unit, confirm that whether the dynamic pulse signal detecting impulse singla corresponding with output in short-term comprised in back production signal within complete cycle is consistent, to confirm the normal work of circuit.
9. track traffic safety control circuit according to claim 8, is characterized in that: it is the square-wave signal of 50% that described reference signal generation unit produces dutycycle.
10. track traffic safety control circuit according to claim 9, is characterized in that: the frequency of described square-wave signal is f, 10Hz≤f≤200Hz.
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| CN201410489955.8A CN104386091B (en) | 2014-09-23 | 2014-09-23 | A kind of track traffic safety control circuit and system |
| CN201610309006.6A CN105946902B (en) | 2014-09-23 | 2014-09-23 | A kind of Static output adds the track traffic Safety output system of static dynamic pulse detection |
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| CN107380209B (en) * | 2017-08-10 | 2024-03-12 | 浙江众合科技股份有限公司 | Detection circuit for controlling switch machine |
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| CN105446251B (en) * | 2016-01-18 | 2018-08-24 | 湖南中车时代通信信号有限公司 | A kind of secure digital amount input system and its signal processing method |
| CN108693805A (en) * | 2016-06-14 | 2018-10-23 | 浙江众合科技股份有限公司 | A kind of fail-safe computer output control system |
| CN107817783A (en) * | 2017-10-23 | 2018-03-20 | 天津市英贝特航天科技有限公司 | Method and system for detecting recovery of output signal of rail transit |
| CN113562017A (en) * | 2021-08-19 | 2021-10-29 | 中铁二十四局集团上海电务电化有限公司 | Railway switch interlocking control system |
| CN113562017B (en) * | 2021-08-19 | 2023-02-28 | 中铁二十四局集团上海电务电化有限公司 | Railway turnout interlocking control system |
| CN114844026A (en) * | 2022-07-04 | 2022-08-02 | 北京全路通信信号研究设计院集团有限公司 | Safe input circuit and fault detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104386091B (en) | 2016-06-22 |
| CN105946902A (en) | 2016-09-21 |
| CN105946902B (en) | 2017-10-10 |
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