CN206036646U - LNG adds unibus controlling means of mechanism of qi multimachine interconnection - Google Patents
LNG adds unibus controlling means of mechanism of qi multimachine interconnection Download PDFInfo
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- CN206036646U CN206036646U CN201621024582.8U CN201621024582U CN206036646U CN 206036646 U CN206036646 U CN 206036646U CN 201621024582 U CN201621024582 U CN 201621024582U CN 206036646 U CN206036646 U CN 206036646U
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Abstract
The utility model relates to a LNG adds unibus controlling means of mechanism of qi multimachine interconnection, this unibus controlling means will many adds the mechanism of qi through a bus cable junction, every adds all bus level of control bus cable at any time of mechanism of qi, thereby control bus cable, other add the mechanism of qi and carry out relevant program operation according to the change of bus level, each adds the branch that does not have the principal and subordinate between the mechanism of qi, only through a bus cable, realize many interlockings that add between the mechanism of qi of single pump, when avoiding one to add mechanism of qi air entrainment or precooling operation to another air entrainment in -process add the mechanism of qi air entrainment less than the time lead to the fact the phenomenon of jumping the rifle.
Description
Technical field
This utility model belongs to aerating technical field, is related to filling machine control technology, specifically, is related to a kind of LNG and adds
The monobus control device of mechanism of qi multimachine interconnection, is applied to liquefied natural gas (English：Liquefied Natural Gas, contracting
Write：LNG) the mutual lock control of single pump multimachine of filling machine.
Background technology
LNG filling machines common in the market generally share one or more immersed pump using multiple stage filling machine and carry out
The filling of LNG.But when a filling machine carries out LNG aeratings or pre-cooling is operated, it is easily caused in another filling machine fueling process
Aerating less than when occur jump rifle phenomenon.Conventional settling mode is interlocked using single pump two-shipper at present, but runs into single pump multimachine (three
Platform and above filling machine) when, still can exist aerating less than when occur jump rifle phenomenon.
Utility model content
This utility model for prior art exist single pump multimachine when filling machine fueling process in aerating less than when occur
Jump the problem of rifle phenomenon, there is provided a kind of monobus control device of LNG filling machines multimachine interconnection, the control device and method solution
Determined single pump multimachine aerating when the filling machine aerating that occurs less than the problem for occurring jumping rifle phenomenon.
In order to achieve the above object, this utility model provides a kind of monobus control dress of LNG filling machines multimachine interconnection
Put, including multiple stage filling machine and bus cable, the control unit input signal end of every filling machine and output signal end are and institute
State bus cable connection.Multiple stage filling machine is connected with each other by a bus cable, realizes the interlocking between multiple stage filling machine, often
The control unit of platform filling machine can control the bus level of bus cable, realize monobus control function, it is to avoid multimachine aerating
When the filling machine aerating that occurs less than occurring jumping rifle phenomenon.
As the decision design of the above-mentioned monobus control device of this utility model,
When in multiple stage filling machine, at least one filling machine performs aerating at any one time, the filling machine for performing aerating passes through
The bus level of bus cable is put height to bus cable by the output signal end transmitting control commands of control unit, is not carried out adding
By the input signal end of control unit, the filling machine of gas detects that the bus level of bus cable is height；
When there is the execution aerating of at least one filling machine in all filling machines for performing aerating, the bus electricity of bus cable
It is flat still to put height；
After all filling machines for performing aerating terminate aerating, filling machine is sent by the output signal end of control unit
The bus level of bus cable is set low by control command to bus cable；
When all filling machines are standby, the bus level of bus cable is low.
As the decision design of the above-mentioned monobus control device of this utility model,
When filling machine is standby, the bus level of bus cable is put by filling machine by the output signal end of control unit
It is low, all filling machine state consistencies；
When an arbitrary filling machine performs aerating, and during only one filling machine execution aerating, the filling machine for performing aerating leads to
The bus level of bus cable is put height by the output signal end for crossing control unit, and remaining filling machine is believed by the input of control unit
Number end detect bus cable bus level be high level, at the end of aerating, perform aerating filling machine pass through control unit
Output signal end the bus level of bus cable is set low；
When at least two filling machines perform aerating, filling machine is by the output signal end of control unit by bus cable
Bus level puts height, if wherein one filling machine aerating operation terminates, other filling machines still carry out aerating, bus cable it is total
Line level remains in that high level；After all filling machine aeratings operation terminates, output signal of the filling machine by control unit
The bus level of bus cable is set low by end；
When at least two filling machines perform aerating simultaneously, output signal of the filling machine of aerating by control unit is performed
The bus level of bus cable, to bus cable, is put height by transmitting control commands simultaneously at end, and the filling machine for performing aerating is simultaneously logical
The input signal end for crossing control unit receives the bus level information of bus cable, after all filling machine aeratings operation terminates,
The bus level of bus cable is set low by filling machine simultaneously that terminate aerating by the output signal end of control unit.
As the decision design of the above-mentioned monobus control device of this utility model, the bus cable include communication bus and
Common ground line, the control unit input signal end of every filling machine and output signal end are connected with the communication bus.
As the decision design of the above-mentioned monobus control device of this utility model, the communication bus by input circuit with
The input signal end connection, the communication bus pass through output circuit and the output signal end, the common ground line point
It is not connected with the earth terminal of input circuit and output circuit.
Used as the decision design of the above-mentioned monobus control device of this utility model, the input circuit is by optocoupler detection electricity
Road and the series circuit of inductance composition, one end of inductance are connected with communication bus, and the other end and the optocoupler of inductance detect circuit
Input connects, and the outfan of optocoupler detection circuit is connected with the input signal end.
As the decision design of the above-mentioned monobus control device of this utility model, the output circuit be by audion Q1,
Diode D2, resistance R15, inductance R26, inductance R27 and inductance R31 composition series-parallel circuit；The emitter stage of the audion Q1
Connection power supply, the colelctor electrode of the audion Q1 connect the positive pole of diode D2, and the negative pole of diode D2 is connected with communication bus；
Described resistance R15 one end is connected between the negative pole and communication bus of diode D2, other end ground connection；Described inductance R26 one end
It is connected with the colelctor electrode of audion Q1, other end ground connection；Described inductance R27 one end is connected with the output signal end, the other end
The base stage of connecting triode Q1, described inductance R31 one end connect power supply, and the other end is connected with the base stage of audion Q1.
As the further design of the above-mentioned monobus control device of this utility model, the input circuit and the input letter
Between number end, between the output circuit and the output signal end, it is respectively connected with isolating chip, it is ensured that filling machine control unit
It is mutually isolated with external circuit.
Used as the decision design of the above-mentioned monobus control device of this utility model, the multiple stage filling machine connects same and dives
Liquid pump.
Compared with prior art, advantage of the present utility model and good effect are：
(1) the monobus control device of the LNG filling machines multimachine interconnection that this utility model is provided, multiple stage filling machine is passed through
The connection of one bus cable, every filling machine can controlling bus cable at any time bus level, so as to controlling bus cable, its
Its filling machine performs related procedure operation according to the change of bus level, and no master-slave between each filling machine is only led to
Cross a bus cable, realize the interlocking between single pump multiple stage filling machine, it is to avoid when a filling machine aerating or pre-cooling are operated pair
Filling machine aerating in another fueling process less than when cause jump rifle phenomenon.
(2) the monobus control device of the LNG filling machines multimachine interconnection that this utility model is provided, only by a bus electricity
Cable connects multiple stage filling machine, and wiring is simple, easy to operate, with low cost, it is adaptable to during single pump multimachine application between filling machine
Connection, every filling machine can be with any time transmitting control commands to bus cable, the time limit not limited by other filling machines
System, multiple stage filling machine can be simultaneously emitted by control command to bus cable, controlling bus state；Multiple stage filling machine can also be connect simultaneously
Receive the bus state information of bus cable.
(3) the monobus control device of the LNG filling machines multimachine interconnection that this utility model is provided, by simply clearly single
Bus connecting mode, controls the bus level of monobus using the control unit of filling machine, according to the state of bus level, respectively plus
Mechanism of qi performs the operation of the corresponding programs such as aerating, it is easy to operation and realization.
Description of the drawings
Fig. 1 is the structure diagram of the monobus control device of four machine of this utility model one embodiment LNG filling machine interconnection.
Fig. 2 is the circuit diagram of input circuit in this utility model embodiment.
Fig. 3 is the circuit diagram of output circuit in this utility model embodiment.
Fig. 4 is the control flow in the another embodiment of this utility model during three filling machines execution aeratings to communication bus
Figure.
1st, the first filling machine, the 2, second filling machine, the 3, the 3rd filling machine, the 4, the 4th filling machine, 5, bus cable, 51, logical
Letter bus, 52, common ground line.
Specific embodiment
Below, this utility model is specifically described by exemplary embodiment.It should be appreciated, however, that not having
In the case of being further discussed below, the element, structure and features in an embodiment can also be advantageously incorporated into other enforcements
In mode.Additionally, term " first ", " second ", " the 3rd ", " the 4th " and " the 5th " is only used for describing purpose, and it is not understood that
For indicating or implying relative importance.
In one embodiment of the present utility model, referring to Fig. 1, there is provided a kind of list of four machine of LNG filling machines interconnection is total
Thread control device, including four filling machines and a bus cable 5 of same immersed pump of connection, four filling machines are respectively the
One filling machine 1, the second filling machine 2, the 3rd aerating 3, the 4th filling machine 4, the control unit input signal end of every filling machine and
Output signal end is connected with the bus cable.Four filling machines are connected with each other by a bus cable, realize four
Interlocking between filling machine, the control unit of every filling machine can control the bus level of bus cable, realize monobus control
Function processed, it is to avoid the filling machine aerating occurred during multimachine aerating jumps rifle phenomenon less than appearance.
For the ease of connecting four filling machines, in monobus control device described in this utility model above-described embodiment, ginseng
See Fig. 1, the bus cable 5 includes communication bus 51 and common ground line 52, the control unit input signal of every filling machine
End and output signal end are connected with the communication bus.
In order to realize the signal transmission between communication bus and input signal end, between communication bus and output signal end,
In monobus control device described in this utility model above-described embodiment, referring to Fig. 2, the communication bus by input circuit with
The input signal end connection, the communication bus pass through output circuit and the output signal end, the common ground line point
It is not connected with the earth terminal of input circuit and output circuit.The control unit of any filling machine can be connect by input circuit
Receive the bus level state of communication bus；The control unit of any filling machine exports high level by output circuit can be by
The bus level of communication bus puts height.
In order to realize the information transfer between communication bus and input signal end, referring to Fig. 3, in the above-mentioned reality of this utility model
Apply in the example monobus control device, the input circuit is the series circuit being made up of optocoupler detection circuit and inductance R76,
One end of inductance R76 is connected with communication bus, and the other end and the optocoupler of inductance R76 detect that the input of circuit is connected, optocoupler inspection
The outfan of slowdown monitoring circuit is connected with the input signal end.By optocoupler, input circuit detects that single channel detects the bus of communication bus
After level state, by input signal end of this state by optocoupler output HUSUO_GL to filling machine control unit.Input electricity
When road carries out information transfer, when communication bus is idle, the bus level of communication bus is low, and photoelectrical coupler U34 is in and cuts
Only state, optocoupler output HUSUO_GL output low level, and low level signal is transmitted to the input of filling machine control unit
Signal end, filling machine control unit are processed to the low level signal for receiving；When the bus level of communication bus is high,
Photoelectrical coupler U34 is turned on, optocoupler output HUSUO_GL output high level, and low and high level signal transmission is to filling machine control
The input signal end of unit, filling machine control unit are processed to the low level signal for receiving.
In order to realize the information transfer between communication bus and output signal end, referring to Fig. 4, in the above-mentioned reality of this utility model
Apply in the example monobus control device, the output circuit is by audion Q1, diode D2, resistance R15, inductance R26, electricity
Sense R27 and inductance R31 composition series-parallel circuits；The emitter stage connection power supply of the audion Q1, the current collection of the audion Q1
Pole connects the positive pole of diode D2, and the negative pole of diode D2 is connected with communication bus；Described resistance R15 one end is connected to diode
Between the negative pole and communication bus of D2, other end ground connection；Described inductance R26 one end is connected with the colelctor electrode of audion Q1, another
End ground connection；Described inductance R27 one end is connected with the output signal end, the base stage of other end connecting triode Q1, the inductance
R31 one end connects power supply, and the other end is connected with the base stage of audion Q1.When output circuit carries out information transfer, filling machine control
The output wire size end transmission OUT1_GL signals of unit, when OUT1_GL signals are high, audion Q1 cut-offs, diode D2 cut-offs,
Bus level is dragged down by R15；When OUT1_GL signals are low, height is put in audion Q1 conductings, diode D2 conductings, bus level.
When four filling machines are standby, the bus level of communication bus is low, every filling machine state consistency, all filling machines
State becomes circulating valve opening, and air entraining valve is closed.When at a time arbitrary filling machine performs aerating operation, by communication bus
Bus level puts height, and it is high electricity that the input signal end of its excess-three platform filling machine control unit detects the bus level of communication bus
It is flat, air entraining valve is closed, just enters vehicle-mounted in the filling machine of aerating operation to ensure that the LNG liquid of immersed pump output is all flowed through
Bottle, without flowing back to storage tank.After aerating terminates, the bus level of communication bus is set low.
In whole fueling process, if only the first filling machine performs aerating operation, after aerating terminates, the first filling machine control
The output signal end output signal of unit processed is low, and the bus level of communication bus is set low.If performed in the first filling machine
In fueling process, one or more in the second filling machine, the 3rd filling machine, the 4th filling machine also perform aerating operation, perform
The bus level of communication bus can be put height by other filling machines of aerating operation.Therefore, even if the first filling machine aerating operation knot
Shu Hou, the bus level of communication bus is set low, but as the control unit for still having other filling machines passes through its output signal
The bus level of end control communication bus puts height, and the bus level of communication bus still can keep high level.First filling machine is tied
Shu Jiaqi also can only close air entraining valve, keep circulating valve to be still within closed mode.If the first filling machine, the second aerating
In machine, the 3rd filling machine, the 4th filling machine, at least two filling machines perform aerating operation simultaneously, perform the filling machine of aerating operation
Simultaneously by the output signal end output control order of control unit, the bus level of communication bus is put into height.When all execution
The filling machine of aerating complete aerating operation after, the bus level of communication bus is set low, now the bus level of communication bus because
All filling machine output levels are low and become low level.Aerating terminates, and all filling machines open circulating valve, closes air entraining valve,
Into holding state.
Single line control apparatus in the present embodiment realize the interlocking of four LNG filling machines, realize the list of four LNG filling machines
Bus marco.
In another embodiment of the present utility model, in order to ensure filling machine control unit and external circuit mutually every
From being respectively connected between the input circuit and the input signal end, between the output circuit and the output signal end
Isolating chip, the output signal end of filling machine control unit transmit a signal to isolating chip, and isolating chip passes through output circuit
Export to communication bus, after input circuit detects the state of communication bus, transmitted by isolating chip single to filling machine control
The input signal end of unit, the status information of communication bus of the filling machine control unit to obtaining are processed.
In another embodiment of the present utility model, and there is provided a kind of monobus control of three machine of LNG filling machines interconnection
Device processed, including three filling machines and a bus cable of same immersed pump of connection, the control unit of every filling machine is defeated
Enter signal end and output signal end is connected with the bus cable.Three filling machines are connected with each other by a bus cable,
Realize the interlocking between three filling machines.Four machine of the LNG filling machines interconnection provided in its operation principle and above-described embodiment
The operation principle of monobus control device is identical.
In the whole fueling process of three filling machines, if only the first filling machine performs aerating operation, after aerating terminates,
The output signal end output signal of the first filling machine control unit is low, and the bus level of communication bus is set low.If
One filling machine is performed in fueling process, and one or two in the second filling machine, the 3rd filling machine also performs aerating operation, performs
The bus level of communication bus can be put height by other filling machines of aerating operation.Therefore, even if the first filling machine aerating operation knot
Shu Hou, the bus level of communication bus is set low, but as the control unit for still having other filling machines passes through its output signal
The bus level of end control communication bus puts height, and the bus level of communication bus still can keep high level.First filling machine is tied
Shu Jiaqi also can only close air entraining valve, keep circulating valve to be still within closed mode.When it is all perform aeratings filling machines it is complete
Into after aerating operation, the bus level of communication bus is set low, now the bus level of communication bus is exported because of all filling machines
Level is low and become low level.Aerating terminates, and all filling machines open circulating valve, closes air entraining valve, into holding state.
It is referring to Fig. 4, as follows to the control of communication bus during three filling machine execution aeratings：In T1 moment, the first filling machine
Aerating is performed simultaneously with the second filling machine, be simultaneously emitted by high level signal, communication bus Lothrus apterus.T2 moment, the 3rd filling machine
Aerating is performed, high level signal is sent, now, the first filling machine, the second filling machine, the 3rd filling machine are realized total to communicating simultaneously
The bus level control of line, the bus level Lothrus apterus of communication bus.Bus electricity of the T3 and T4 moment filling machines to communication bus
It is flat to be read out and signal is processed.
Single line control apparatus in the present embodiment realize the interlocking of three LNG filling machines, realize the list of three LNG filling machines
Bus marco.
In some embodiment of the present utility model, and there is provided a kind of monobus control of five machine of LNG filling machines interconnection
Device processed, including five filling machines and a bus cable of same immersed pump of connection, the control unit of every filling machine is defeated
Enter signal end and output signal end is connected with the bus cable.Five filling machines are connected with each other by a bus cable,
Realize the interlocking between five filling machines.Four machine of the LNG filling machines interconnection provided in its operation principle and above-described embodiment
The operation principle of the monobus control device of monobus control device and the interconnection of three machine of LNG filling machines is identical.
In the whole fueling process of five filling machines, if only the first filling machine performs aerating operation, after aerating terminates,
The output signal end output signal of the first filling machine control unit is low, and the bus level of communication bus is set low.If
One filling machine is performed in fueling process, one in the second filling machine, the 3rd filling machine, the 4th filling machine, the 5th filling machine or
Multiple also to perform aerating operation, the bus level of communication bus can be put height by other filling machines for performing aerating operation.Therefore, i.e.,
After terminating the first filling machine aerating operation, the bus level of communication bus is set low, but due to still there is other filling machines
Control unit puts height by the bus level that its output signal end controls communication bus, and the bus level of communication bus still can be protected
Hold high level.First filling machine terminates aerating and also can only close air entraining valve, keeps circulating valve to be still within closed mode.Work as institute
After having the filling machine for performing aerating to complete aerating operation, the bus level of communication bus is set low, now the bus of communication bus
Level is low and become low level because of all filling machine output levels.Aerating terminates, and all filling machines open circulating valve, closes and adds
Air valve, into holding state.
Single line control apparatus in the present embodiment realize the interlocking of five LNG filling machines, realize the list of five LNG filling machines
Bus marco.
Above-described embodiment is used for explaining this utility model, rather than this utility model is limited, in this utility model
Spirit and scope of the claims in, any modifications and changes made to this utility model both fall within this practicality new
The protection domain of type.
Claims (9)
1. the monobus control device that a kind of LNG filling machines multimachine is interconnected, it is characterised in that including multiple stage filling machine and bus electricity
Cable, the control unit input signal end of every filling machine and output signal end are connected with the bus cable.
2. the monobus control device that LNG filling machines multimachine as claimed in claim 1 is interconnected, it is characterised in that a period of time in office
When carving at least one filling machine in multiple stage filling machine and performing aerating, the filling machine for performing aerating is believed by the output of control unit
The bus level of bus cable is put height, is not carried out the filling machine of aerating by control to bus cable by number end transmitting control commands
The bus level of the input signal end detection bus cable of unit processed is height；
When there is the execution aerating of at least one filling machine in all filling machines for performing aerating, the bus level of bus cable is still
Height is put so；
After all filling machines for performing aerating terminate aerating, filling machine sends control by the output signal end of control unit
Order to bus cable, the bus level of bus cable is set low；
When all filling machines are standby, the bus level of bus cable is low.
3. the monobus control device that LNG filling machines multimachine as claimed in claim 2 is interconnected, it is characterised in that work as filling machine
When standby, the bus level of bus cable is set low by filling machine by the output signal end of control unit, all filling machine states
Unanimously；
When an arbitrary filling machine performs aerating, and during only one filling machine execution aerating, the filling machine of aerating is performed by control
The bus level of bus cable is put height by the output signal end of unit processed, input signal end of remaining filling machine by control unit
The bus level for detecting bus cable is high level, at the end of aerating, performs the filling machine of aerating by the defeated of control unit
Go out signal end to set low the bus level of bus cable；
When at least two filling machines perform aerating, filling machine is by the output signal end of control unit by the bus of bus cable
Level puts height, if wherein one filling machine aerating operation terminates, other filling machines still carry out aerating, the bus electricity of bus cable
It is flat to remain in that high level；After all filling machine aeratings operation terminates, filling machine will by the output signal end of control unit
The bus level of bus cable sets low；
When at least two filling machines perform aerating simultaneously, the filling machine for performing aerating is same by the output signal end of control unit
When transmitting control commands to bus cable, the bus level of bus cable is put into height, the filling machine of aerating is performed simultaneously by control
The input signal end of unit processed receives the bus level information of bus cable, after all filling machine aeratings operation terminates, terminates
The bus level of bus cable is set low by the filling machine of aerating simultaneously by the output signal end of control unit.
4. the monobus control device that the LNG filling machines multimachine as described in claims 1 to 3 any one is interconnected, its feature exist
In the bus cable includes communication bus and common ground line, the control unit input signal end of every filling machine and output
Signal end is connected with the communication bus.
5. the monobus control device that LNG filling machines multimachine as claimed in claim 4 is interconnected, it is characterised in that the communication
Bus is connected with the input signal end by input circuit, and the communication bus passes through output circuit and the output signal
End, the common ground line are connected with the earth terminal of input circuit and output circuit respectively.
6. the monobus control device that LNG filling machines multimachine as claimed in claim 5 is interconnected, it is characterised in that the input
Circuit is to detect series circuit that circuit and inductance are constituted by optocoupler, and one end of inductance is connected with communication bus, inductance it is another
Hold and detect that the input of circuit is connected with optocoupler, the outfan of optocoupler detection circuit is connected with the input signal end.
7. the monobus control device that LNG filling machines multimachine as claimed in claim 5 is interconnected, it is characterised in that the output
Circuit is to constitute series-parallel circuit by audion Q1, diode D2, resistance R15, inductance R26, inductance R27 and inductance R31；It is described
The emitter stage connection power supply of audion Q1, the colelctor electrode of the audion Q1 connect the positive pole of diode D2, and diode D2's is negative
Pole is connected with communication bus；Described resistance R15 one end is connected between the negative pole and communication bus of diode D2, another termination
Ground；Described inductance R26 one end is connected with the colelctor electrode of audion Q1, other end ground connection；Described inductance R27 one end and the output
Signal end connects, the base stage of other end connecting triode Q1, and described inductance R31 one end connects power supply, the other end and audion Q1
Base stage connection.
8. the monobus control device that the LNG filling machines multimachine as described in claim 5 to 7 any one is interconnected, its feature exist
In being respectively connected between the input circuit and the input signal end, between the output circuit and the output signal end
Isolating chip.
9. the monobus control device that LNG filling machines multimachine as claimed in claim 1 is interconnected, it is characterised in that the multiple stage
Filling machine connects same immersed pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621024582.8U CN206036646U (en) | 2016-08-31 | 2016-08-31 | LNG adds unibus controlling means of mechanism of qi multimachine interconnection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621024582.8U CN206036646U (en) | 2016-08-31 | 2016-08-31 | LNG adds unibus controlling means of mechanism of qi multimachine interconnection |
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| Publication Number | Publication Date |
|---|---|
| CN206036646U true CN206036646U (en) | 2017-03-22 |
Family
ID=58298917
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621024582.8U Active CN206036646U (en) | 2016-08-31 | 2016-08-31 | LNG adds unibus controlling means of mechanism of qi multimachine interconnection |
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| Country | Link |
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| CN (1) | CN206036646U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224763A (en) * | 2016-08-31 | 2016-12-14 | 杰瑞石油天然气工程有限公司 | The monobus control device and method of LNG filling machine multimachine interconnection |
-
2016
- 2016-08-31 CN CN201621024582.8U patent/CN206036646U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224763A (en) * | 2016-08-31 | 2016-12-14 | 杰瑞石油天然气工程有限公司 | The monobus control device and method of LNG filling machine multimachine interconnection |
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