CN106555643A - Ship machine SCR multichannel jet control systems - Google Patents
Ship machine SCR multichannel jet control systems Download PDFInfo
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- CN106555643A CN106555643A CN201510627010.2A CN201510627010A CN106555643A CN 106555643 A CN106555643 A CN 106555643A CN 201510627010 A CN201510627010 A CN 201510627010A CN 106555643 A CN106555643 A CN 106555643A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention discloses ship machine SCR multichannel jet control systems, is related to the injection control technology in multiple stage marine diesel SCR device, belongs to ship machine exhaust after treatment system field.The present invention is the post processing needs from multiple stage diesel engine peculiar to vessel, is respectively directed to high-pressure pump and conventional pump proposes different solutions, differs primarily in that conventional pump needs outer access compressed air, the urea liquid to spraying to carry out assisted atomization；The nozzle of conventional pump can be made up of two input ports of liquids and gases, and compressed air typically accesses gas access, and the nozzle undesirable gas entrance of high-pressure pump, only retain liquid inlet.Exhaust aftertreatment problem of the present invention for multichannel diesel engine, propose carries out the scheme of urea liquid injection control using single pump+common rail pipeline, the needs of multichannel pipeline pump-down process can not only be met, and the structure composition of system can be reduced, the weight of reduction equipment, meet the needs of integrated optimization, preferably improve the suitable dress property in naval vessel of the system.
Description
Technical field
The invention discloses ship machine SCR multichannel jet control systems, are related to the injection control in multiple stage marine diesel SCR device
Technology processed, belongs to ship machine exhaust after treatment system field.
Background technology
In October, 2008, IMO has formally passed through the amendment of 73/78 supplemental provisions VI of MARPOL《NOX technical regulations》, it is right
NOXDischarge proposes the restriction requirement of three phases.With the development of ship machine Abgasgesetz plus tight and world shipping industry, for
The emission level of current marine diesel, depends merely on emission controls by improving combustion and is difficult to meet emission limit requirement of the phase III to NOx, machine
The application of outer control technology has been certainty, therefore, in exhaust aftertreatment peculiar to vessel, SCR post-processing technologies are inexorable trends.
SCR (SCR) technology is referred under excess oxygen, from suitable catalyst, makes reducing agent and waste gas
The chemical reaction of middle NOx is catalyzed acceleration, while the dioxygen oxidation in suppressing reducing agent to be vented.SCR is made to realize NOx's
Quickly, efficiently reduction depends primarily on catalyst, reducing agent and reaction temperature.
In general, vehicle-mounted large diesel engine is furnished with 1, ship for civil use is furnished with 2～4 diesel engines, and large ship is furnished with 6～8
Platform diesel engine.And in the design of traditional SCR device, jet control system carries out injection control only for single diesel engine, and
Without reference to the multiplexing of multiple stage diesel engine.This for naval vessel not only increases the burden of warship design, wastes sky in cabin
Between, and increase the weight of on-board equipment.Therefore, the present invention proposes a kind of design of multichannel SCR jet control system.
The content of the invention
The present invention be directed to the post processing of multiple stage diesel engine peculiar to vessel needs, there is provided a kind of multichannel SCR jet control system.
Ship machine SCR multichannel jet control systems, mainly including urea cabinet, common rail pipeline, high pressure nozzle, gas exhaust piping, manually
Valve A and B, strainer valve, HP jetting pump, ripple damper, pressure regulator valve, magnetic valve, pressure-reducing valve, check-valves and triple valve,
Wherein, manually valve A, B and strainer valve are connected urea cabinet with HP jetting pump, and hand-operated valve A is arranged under urea cabinet
Trip, hand-operated valve B are arranged on the upstream of HP jetting pump；Ripple damper is arranged on the downstream of HP jetting pump, for eliminating spray
The pressure vessel of liquid pressure pulsations in the pipeline of system, stabilized fluid pressure and flow are penetrated, the work essence of HP jetting pump is improved
Degree and jet power；Urea liquid after HP jetting pump outflow flows into common rail pipeline by triple valve and is shunted, common rail
Injection branch quantity after pipeline is set by the diesel engine that Engine Room is arranged；Common rail pipeline is equipped with pressure regulator valve, for monitoring injection
The pressure information of common rail pipeline, and feed back to control system；Common rail pipeline has output interface, and each output interface corresponds to single
Injection branch, injection branch are disposed with magnetic valve, pressure-reducing valve, check-valves and high pressure nozzle, and pressure-reducing valve is used to adjust injection solution
Into the pressure of high pressure nozzle, check-valves is used for the malleation poured in down a chimney in guarantee pipeline for preventing pipeline solution；High pressure nozzle has liquid
Entrance, on each diesel exhaust gas pipeline, its direction and exhaust flow direction are consistent；When common rail loine pressure exceedes setting
Threshold values, control system automatically adjust the working condition of pressure regulator valve and magnetic valve, to ensure that pipeline sprays the flow regular supply of solution；
Control system is according to diesel spray amount and the positional information of gas exhaust piping, magnetic valve dutycycle or the opening and closing to spraying branch
Time is allocated, and arranges the electromagnetic valve work time of injection branch and an order, to meet urea liquid in common rail pipeline
Injection needs, and realizes single post processing of the pump to multichannel diesel exhaust gas pipeline, comprising power supply box, controller, power supply lines
And communication bus, the power supply of power supply box offer control system；Sensor includes NOx sensor, temperature sensor, pressure sensing
Device, differential pressure pickup, torque sensor, speed probe and liquid level sensor；Control system is communicated from CAN Bus
Or bus+I/O control modes, supply of the controller by magnetic valve regulation piping flow.
Described ship machine SCR multichannel jet control systems, the size of urea cabinet volume is determined by the quantity for accessing diesel engine, by one
Its stream time is setting.
Described ship machine SCR multichannel jet control systems, HP jetting pump and high pressure nozzle replace with common jet pump and general respectively
Logical nozzle, by outer access compressed air, the urea liquid to spraying carries out assisted atomization, and plain nozzle is by liquids and gases two
Individual input port composition, compressed air access gas access；Control system increases to the compressed air electromagnetic valve closure in air branch
Control；Compressed air line includes compressed air source, magnetic valve, hand-operated valve and pressure-reducing valve；Wherein compressed air source is by naval vessel
Air compressor provide, compressed air require determined by the quantity of diesel engine；The magnetic valve of compressed air is only used for control closure,
Duty when assignment of traffic problem is not considered, it is preferred that emphasis is Stress control of the pressure-reducing valve in air branch to compressed air；Commonly
The design of nozzle increases the pipe interface of compressed air, and the access of compressed air can design compressed air interface in injection line,
It is not limited on plain nozzle.
Described ship machine SCR multichannel jet control systems, the working condition signal of the multiple diesel engines of control system real-time reception, comprising torsion
Square, rotating speed, extraction flow and delivery temperature, according to diesel emission characteristic, need in the gas exhaust piping for calculating different diesel engines
The urea liquid amount of injection；Control system connects the magnetic valve of urea cabinet and sends work order to jet pump in opening injection line,
Jet pump is made to start working, jet pump is drawn urea liquid by the emitted dose for calculating and gives common rail pipeline by Pipe transfer.
Summary, exhaust aftertreatment problem of the present invention for multichannel diesel engine, it is proposed that urinated using single pump+common rail pipeline
The scheme of plain solution injection control, can not only meet the needs of multichannel pipeline pump-down process, and can reduce the structure composition of system,
The weight of reduction equipment, meets the needs of integrated optimization, preferably improves the suitable dress property in naval vessel of the system.
Description of the drawings
Fig. 1 is the HP jetting pump system diagram of the present invention.
Fig. 2 is the control system figure of the present invention.
Fig. 3 is the compressed air line schematic diagram of the common jet pump system of the present invention.
Fig. 4 is the injection line schematic diagram of the common jet pump system of the present invention.
In figure, label is schematically as follows：P1- urea cabinets, P2- common rail pipelines, P3- high pressure nozzles, P4- gas exhaust pipings, P6- commonly spray
Mouth, P7- gas exhaust pipings, V1- hand-operated valve A, V3- hand-operated valve B, V2- strainer valves, V4- HP jetting pumps, V5- dampings of pulsation
Device, V6- pressure regulator valves, V7- magnetic valves, V8- pressure-reducing valves, V9- check-valves, V10- triple valves, V11- hand-operated valves, V13- decompressions
Valve, C1- power supply boxs, C2- controllers, D1- power supply lines, t1- communication buses, pipe interfaces of the I1-I6 for compressed air.
Specific embodiment
The present invention is asked for the exhaust aftertreatment of multiple stage marine diesel with integrated optimization, save space and optimization resource as target
Topic, there is provided two Analysis of Nested Design schemes of the spraying system of single pump multi output.
(1) high-pressure pump ejection schemes
As shown in figure 1, high-pressure pump spraying system of the present invention, including urea cabinet P1, common rail pipeline P2, high pressure nozzle P3, row
Air pipe P4, hand-operated valve A and B, strainer valve V2, HP jetting pump V4, ripple damper V5, pressure regulator valve V6, electromagnetism
Valve V7, pressure-reducing valve V8, check-valves V9 and triple valve V10.Urea cabinet P1 and HP jetting pump V4 manually valve A, B
Connect with strainer valve V2, hand-operated valve A is arranged on urea cabinet P1 downstreams, and hand-operated valve B is arranged on the upstream of HP jetting pump V4,
Depending on being primarily due to the layout constraints of warship cabin；The size of urea cabinet P1 volumes is determined by the quantity for accessing diesel engine, by one
Its stream time is setting.Ripple damper V5 is used for the pressure vessel for eliminating liquid pressure pulsations in pipeline, stationary flow
Body pressure and flow, improve the operating accuracy and jet power of HP jetting pump V4.Urea liquid is flowed through HP jetting pump V4
After going out, common rail pipeline P2 is flowed into by triple valve V10 and is shunted, the injection branch quantity after common rail pipeline is by Engine Room
The diesel engine setting of arrangement, adjustable electromagnetic valve V7, pressure-reducing valve V8 and non-return are accessed in each injection branch in generally 3～6 tunnels
Valve V9.Common rail pipeline P2 is provided with pressure regulator valve V6, for monitoring the pressure information of injection common rail pipeline and anti-to control system
Feedback；If it exceeds setting threshold values, then adjust loine pressure, to ensure that pipeline sprays the flow regular supply of solution.
As shown in Fig. 2 control system includes power supply box C1, controller C2, power supply lines D1 and communication bus t1.Electricity
Source case C1 is used to provide the power supply of control system；Controller according to design need can select embedded processing systems, single-chip microcomputer or
PLC, army grade can select reinforcing machine etc.；The species of sensor as conventional SCR system, including NOx sensor, temperature
Degree sensor, pressure sensor, differential pressure pickup, torque sensor, speed probe and liquid level sensor；Due to the system
The magnetic valve of control object, jet pump and sensor are more, are communicated from CAN Bus or bus+I/O control modes.
Control system includes following major function：1) working condition and data message of multimachine SCR system are shown, has sensing
The data such as device, pump, valve member and state；2) calculating of emitted dose, distribution and display；3) jet pump, the pressure regulation of common rail pipeline and
The control of injection branch magnetic valve；4) monitoring of urea cabinet and flow control；5) transfinite setting and monitoring, the warning of sensor
Deng；6) data and failure logging etc..Controller C2 adjusts the supply of piping flow by magnetic valve V7, and pressure-reducing valve V8 is used for
The pressure that injection solution enters high pressure nozzle is adjusted, check-valves V9 is used for the malleation poured in down a chimney in guarantee pipeline for preventing pipeline solution；
High pressure nozzle P3 is separately mounted on each diesel exhaust gas pipeline P4, and its direction should be consistent with exhaust flow direction.
(2) conventional pump ejection schemes
Different from high-pressure pump spraying system are that conventional pump spraying system needs additional compressed air to help spray the mist of solution
Change.Control system need to increase the control to the compressed air electromagnetic valve closure in air branch；Compressed air line as shown in figure 3,
Contain compressed air source, hand-operated valve V11, pressure-reducing valve V13 etc..Compressed air branch is made up of magnetic valve and pressure-reducing valve.Its
Middle compressed air source can be provided by the air compressor on naval vessel, and compressed air require is determined by the quantity of diesel engine；Compressed air
Magnetic valve is only used for control closure, regardless of duty when assignment of traffic problem, it is preferred that emphasis is the pressure-reducing valve pair in air branch
The Stress control of compressed air.From unlike HP jetting pump in injection branch, the design of plain nozzle increased compression sky
The pipe interface (see I1 in Fig. 4, I2 ... I6 etc.) of gas, the access of compressed air also may be selected to connect in injection line design compressed air
Mouthful, it is not limited on plain nozzle.
To sum up, in the technical scheme that the present invention is provided, spraying system composition mainly includes common rail pipeline and nozzle, include urea cabinet,
Strainer valve, jet pump, ripple damper, pressure regulator valve, magnetic valve, pressure-reducing valve, check-valves and triple valve etc.；Control system group
Into including controller and power supply etc..Spraying system composition can require suitably to be adjusted according to actual pipeline mounting arrangements.
Control system (includes moment of torsion, rotating speed, extraction flow and delivery temperature by the working condition signal of the multiple diesel engines of real-time reception
Deng), the emission performance Map figures formulated in testing of being known the real situation according to diesel emission are calculated in the gas exhaust piping of different diesel engines
Need the urea liquid amount of injection.Control system connects the magnetic valve of urea cabinet and sends work order to spray in opening injection line
Pump being penetrated, making jet pump start working, jet pump is drawn urea liquid by the emitted dose for calculating and common rail pipeline given by Pipe transfer；
Common rail pipeline has output interface, and each output interface corresponds to single injection branch, each injection branch arrange magnetic valve,
Pressure-reducing valve, check-valves and nozzle, nozzle are separately mounted on the gas exhaust piping of different diesel engines.
Positional information of the control system according to the diesel spray amount and gas exhaust piping for calculating, the magnetic valve duty to spraying branch
Than or opening/closing time be allocated, and arrange injection branch the electromagnetic valve work time and an order, with meet in common rail pipeline urinate
The reasonable injection of plain solution needs, and realizes single post processing of the pump to multichannel diesel exhaust gas pipeline.Meanwhile, can pacify in common rail pipeline
Pressure valve group is debug, for monitoring the pressure information of injection common rail pipeline, such as loine pressure exceedes setting limit value, and control system will be from
The dynamic electromagnetic valve work state for adjusting pressure regulator valve and urea branch pipeline, to ensure the normal work of common rail pipeline.
The present invention program is respectively directed to high-pressure pump and conventional pump proposes different solutions, differs primarily in that common jet pump is needed
Compressed air is accessed outward, the urea liquid to spraying carries out assisted atomization；Plain nozzle is by two input port groups of liquids and gases
Gas access accessed typically into, compressed air, and high pressure nozzle undesirable gas entrance, only retain liquid inlet.
The ship machine multichannel SCR jet control system of the present invention can be used as the exhaust aftertreatment injection control of multiple stage diesel engine technically,
When former separate unit SCR device can be overcome to be applied to multiple stage diesel engine, the repeated application problem of introducing is from the perspective of from naval architecture company angle,
The present invention can more meet the integrated optimization demand on naval vessel and improve the economy of multimachine SCR device.Ship machine multichannel proposed by the present invention
The applied environment of SCR jet control systems, be similarly applied to process other SCR reducing agents injection control on, application it is right
It is as being also not limited to naval vessel, similarly suitable under the application backgrounds such as automobile-used, boiler, civilian boat.
Claims (4)
1. ship machine SCR multichannel jet control systems, it is characterised in that mainly include urea cabinet (P1), common rail pipeline (P2),
High pressure nozzle (P3), gas exhaust piping (P4), hand-operated valve A (V1) and B (V3), strainer valve (V2), HP jetting pump
(V4), ripple damper (V5), pressure regulator valve (V6), magnetic valve (V7), pressure-reducing valve (V8), check-valves (V9) and
Triple valve (V10),
Wherein, urea cabinet (P1) and HP jetting pump (V4) manually valve A (V1), B (V3) and strainer valve (V2)
Connection, hand-operated valve A (V1) are arranged on urea cabinet (P1) downstream, and hand-operated valve B (V3) is arranged on HP jetting pump (V4)
Upstream；Ripple damper (V5) installed in the downstream of HP jetting pump (V4), for eliminating liquid in the pipeline of spraying system
The pressure vessel of body pressure fluctuation, stabilized fluid pressure and flow, improve the operating accuracy and injection energy of HP jetting pump (V4)
Power；After HP jetting pump (V4) outflow, flow into common rail pipeline (P2) by triple valve (V10) is carried out urea liquid
Shunting, the injection branch quantity after common rail pipeline (P2) are set by the diesel engine that Engine Room is arranged；Common rail pipeline (P2) is filled
There is pressure regulator valve (V6), for monitoring the pressure information of injection common rail pipeline, and feed back to control system；Common rail pipeline has output
Interface, each output interface correspond to single injection branch, and injection branch is disposed with magnetic valve (V7), pressure-reducing valve (V8), only
Return valve (V9) and high pressure nozzle (P3)；Pressure-reducing valve is used to adjust the pressure that injection solution enters high pressure nozzle, and check-valves is used for
Prevent the malleation poured in down a chimney in guarantee pipeline of pipeline solution；High pressure nozzle only retains liquid inlet, installed in each Diesel Engine Exhaust Pipe
Lu Shang, the direction and exhaust flow direction of high pressure nozzle are consistent；When common rail loine pressure exceedes setting threshold values, control system is automatic
The working condition of pressure regulator valve (V6) and magnetic valve (V7) is adjusted, to ensure that pipeline sprays the flow regular supply of solution；
The positional information of control system diesel spray amount and gas exhaust piping, the magnetic valve dutycycle or opening/closing time to spraying branch
It is allocated, and arranges the electromagnetic valve work time of injection branch and an order, meets the reasonable of urea liquid in common rail pipeline
Injection needs, and realizes single post processing of the pump to multichannel diesel exhaust gas pipeline, comprising power supply box (C1), controller (C2), electricity
Source supply line (D1) and communication bus (t1), wherein power supply box (C1) are for providing the power supply of control system；Sensor
Including NOx sensor, temperature sensor, pressure sensor, differential pressure pickup, torque sensor, speed probe and liquid level
Sensor；System is communicated from CAN Bus or bus+I/O control modes；Controller (C2) is by magnetic valve (V7)
Adjust the supply of piping flow.
2. ship machine SCR multichannel jet control systems according to claim 1, it is characterised in that urea cabinet (P1) volume
Size determined by the quantity for accessing diesel engine, set by one day stream time.
3. ship machine SCR multichannel jet control systems according to claim 1, it is characterised in that HP jetting pump and high pressure
Nozzle replaces with common jet pump and plain nozzle respectively, and by outer access compressed air, the urea liquid to spraying is aided in
Atomization, the nozzle of common jet pump are made up of two input ports of liquids and gases, and compressed air accesses gas access；Control system
Increase the control to the compressed air electromagnetic valve closure in air branch；Compressed air line include compressed air source, magnetic valve,
Hand-operated valve (V11) and pressure-reducing valve (V13)；Wherein compressed air source is provided by the air compressor on naval vessel, compressed air require
Determined by the quantity of diesel engine；The magnetic valve of compressed air is only used for control closure, does not consider duty when assignment of traffic problem,
Focus on Stress control of the pressure-reducing valve in air branch to compressed air；The design of plain nozzle increases the pipeline of compressed air
Interface, the access of compressed air can design compressed air interface in injection line, be not limited on plain nozzle.
4. ship machine SCR multichannel jet control systems according to claim 1 or 3, it is characterised in that control system is real-time
The working condition signal of multiple diesel engines is received, comprising moment of torsion, rotating speed, extraction flow and delivery temperature, according to diesel emission characteristic,
The urea liquid amount sprayed is needed in the gas exhaust piping for calculating different diesel engines；Control system connects urea cabinet in opening injection line
Magnetic valve and send work order to jet pump, make jet pump start working, jet pump by calculate emitted dose draw urea it is molten
Liquid gives common rail pipeline by Pipe transfer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510627010.2A CN106555643A (en) | 2015-09-28 | 2015-09-28 | Ship machine SCR multichannel jet control systems |
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| CN201510627010.2A CN106555643A (en) | 2015-09-28 | 2015-09-28 | Ship machine SCR multichannel jet control systems |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104917A (en) * | 2017-12-31 | 2018-06-01 | 中船动力研究院有限公司 | A kind of Urea-SCR spraying systems |
| CN108661760A (en) * | 2018-05-07 | 2018-10-16 | 广东绿谷净化设备有限公司 | A kind of central control device and method of more SCR systems |
| CN108757115A (en) * | 2018-06-12 | 2018-11-06 | 刘光文 | A kind of fuel gas buring Emission control clarifier for diesel engine |
| CN110318850A (en) * | 2019-06-05 | 2019-10-11 | 广州文冲船厂有限责任公司 | A kind of urea cycle system in SCR system |
| CN112648049A (en) * | 2019-10-11 | 2021-04-13 | 中国船舶重工集团公司第七一一研究所 | SCR urea supply injection system of marine diesel engine |
| CN115306519A (en) * | 2022-09-20 | 2022-11-08 | 中车大连机车研究所有限公司 | Diesel locomotive tail gas aftertreatment system and control method |
| US11525380B2 (en) | 2019-01-11 | 2022-12-13 | Cummins Emission Solutions Inc. | Aftertreatment system with multiple dosing modules |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104917A (en) * | 2017-12-31 | 2018-06-01 | 中船动力研究院有限公司 | A kind of Urea-SCR spraying systems |
| CN108661760A (en) * | 2018-05-07 | 2018-10-16 | 广东绿谷净化设备有限公司 | A kind of central control device and method of more SCR systems |
| CN108757115A (en) * | 2018-06-12 | 2018-11-06 | 刘光文 | A kind of fuel gas buring Emission control clarifier for diesel engine |
| US11525380B2 (en) | 2019-01-11 | 2022-12-13 | Cummins Emission Solutions Inc. | Aftertreatment system with multiple dosing modules |
| CN110318850A (en) * | 2019-06-05 | 2019-10-11 | 广州文冲船厂有限责任公司 | A kind of urea cycle system in SCR system |
| CN110318850B (en) * | 2019-06-05 | 2021-07-16 | 广州文冲船厂有限责任公司 | Urea circulating system for SCR system |
| CN112648049A (en) * | 2019-10-11 | 2021-04-13 | 中国船舶重工集团公司第七一一研究所 | SCR urea supply injection system of marine diesel engine |
| CN115306519A (en) * | 2022-09-20 | 2022-11-08 | 中车大连机车研究所有限公司 | Diesel locomotive tail gas aftertreatment system and control method |
| CN115306519B (en) * | 2022-09-20 | 2024-04-16 | 中车大连机车研究所有限公司 | Diesel locomotive tail gas aftertreatment system and control method |
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Application publication date: 20170405 |