CN106194453A - The micro-spray of diesel oil is ignited natural gas formula double fuel machine control system and method - Google Patents
The micro-spray of diesel oil is ignited natural gas formula double fuel machine control system and method Download PDFInfo
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- CN106194453A CN106194453A CN201610771201.0A CN201610771201A CN106194453A CN 106194453 A CN106194453 A CN 106194453A CN 201610771201 A CN201610771201 A CN 201610771201A CN 106194453 A CN106194453 A CN 106194453A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0613—Switch-over from one fuel to another
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0673—Valves; Pressure or flow regulators; Mixers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
-
- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Signal Processing (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a kind of micro-spray of diesel oil to ignite natural gas formula double fuel machine control system and method, including monitoring cabinet, monoblock pump control unit, natural gas control unit and sensor group；Under pure diesel fuel mode and dual fuel mode, electronically controlled unit pump controls emitted dose and the injection timing of diesel oil；Under dual fuel mode, natural gas control unit controls the switch of the gas trap in each cylinder inlet manifold of electromotor and controls amount of natural gas；Ladder fall oil process is used to realize the switching to dual fuel mode of the pure diesel fuel mode；Ladder fall combustion gas method is used to realize to dual fuel mode to the switching of pure diesel fuel mode；The inequality of each cylinder row's temperature is controlled by the row's of employing temperature correction algorithm；MAP look-up table is used to control the timing of catching fire under each operating mode.The present invention can reach higher efficiency of combustion and preferably discharge index.
Description
Technical field
The invention belongs to control and engine technology, be specifically related to a kind of micro-spray of diesel oil and ignite natural gas formula double fuel machine control
System and method processed.
Background technology
In diesel oil and natural gas double-fuel Diesel engine, in addition to diesel oil, also natural gas is made as main fuel
With, it is achieved in discharge and the reduction of fuel cost of green.Realize double fuel high output diesel engine system at present
Fuel oil controls to have various ways, but has following drawback in actual application:
(1) start diesel engine at dual fuel mode and there is the risk of unburned natural gas leaking；
(2) in handoff procedure, speed fluctuation rate is bigger；
(3) easy gas blowby between each cylinder, and response speed is slower；
(4) it is difficult to reach higher substitution rate.
Ignite natural gas formula double fuel machine control system and method therefore, it is necessary to develop a kind of micro-spray of new diesel oil.
Summary of the invention
It is an object of the invention to provide a kind of micro-spray of diesel oil to ignite natural gas formula double fuel machine control system and method, to reach
To higher efficiency of combustion and preferably discharge index.
The micro-spray of diesel oil of the present invention is ignited natural gas formula double fuel machine control system, including monitoring cabinet, monoblock pump control
Unit processed, natural gas control unit and sensor group；
Described monitoring cabinet has human-computer interaction interface, is used for showing various monitoring information and sending operational order, this monitoring
Cabinet is connected with monoblock pump control unit, natural gas control unit respectively；
The signal gathered is sent to monoblock pump control unit, natural gas control unit, this sensing by described sensor group
Device group is connected with monoblock pump control unit, natural gas control unit respectively；
Described monoblock pump control unit is connected with the electronically controlled unit pump on electromotor, described natural gas control unit with start
Gas trap in each cylinder inlet manifold of machine connects；Under pure diesel fuel mode and dual fuel mode, monoblock pump control unit based on
Signal that sensor group is gathered and operational order control electronically controlled unit pump, by electronically controlled unit pump control diesel oil emitted dose and
Injection timing；Under dual fuel mode, signal that natural gas control unit is gathered based on sensor group and operational order control
Make the switch of each gas trap to control amount of natural gas.
A kind of micro-spray of diesel oil of the present invention is ignited natural gas formula double fuel machine control method, uses as described herein
The micro-spray of diesel oil ignite natural gas formula double fuel machine control system；Its control method includes:
Step one, under pure diesel fuel mode, start diesel engine, realize the spray of Pilot diesel quantity by controlling electronically controlled unit pump
Penetrate, including the control to emitted dose and injection timing；
Step 2, pure diesel fuel mode switch to dual fuel mode:
2a, after startup completes, system receive entrance dual fuel mode control instruction；
2b, monoblock pump control unit judge that whether the micro-spray of diesel oil natural gas formula double fuel machine system of igniting meets and preset
Good double fuel uses condition, if meeting, then enters step 2c；If being unsatisfactory for, then repeat this step；
2c, monitoring cabinet send double fuel enable signal to monoblock pump control unit, natural gas control units；Monoblock pump controls
Unit, natural gas control unit enable signal based on double fuel, use ladder fall oil process to realize pure diesel fuel mode to double fuel
The switching of pattern；
Step 3, exit dual fuel mode:
3a, system receive and exit dual fuel mode control instruction；
3b, monitoring cabinet send exit dual fuel mode signal to monoblock pump control unit, natural gas control units；
3c, monoblock pump control unit, natural gas control unit use ladder fall combustion gas based on exiting dual fuel mode signal
Method realizes the dual fuel mode switching to pure diesel fuel mode；
In described step one to step 3, the inequality of each cylinder row's temperature is controlled by the row's of additionally using temperature correction algorithm
System；MAP look-up table is used to control the timing of catching fire under each operating mode.
Described ladder fall oil process comprises the following steps:
A1, entrance dual fuel mode switching start；
A2, the emitted dose of diesel oil the most progressively decline；
A3, according to the actual speed of electromotor and the deviation of rotating speed of target as input, after being regulated by PID, export gas
The opening time of body valve, the rotating speed of closed loop control electromotor；
A4, judge whether the emitted dose of diesel oil arrives minimum diesel oil amount, the most then diesel oil amount keeps minimum constant, i.e. cuts
Change, entered dual fuel mode, if it is not, then return step A2；
Described ladder fall combustion gas method comprises the following steps:
B1, exit dual fuel mode switching start；
B2, amount of natural gas the most progressively decline；
B3, according to the actual speed of electromotor and the deviation of rotating speed of target as input, by PID closed loop control diesel oil
Emitted dose, with the rotating speed of stable electromotor；
B4, judge whether gas quantity is 0, the most i.e. switched, entered pure diesel fuel mode, if it is not, then return step
B2。
The inhomogeneities of each cylinder row's temperature is controlled by the row's of employing temperature correction algorithm, particularly as follows:
C1, gather each cylinder row temperature；
C2, judge to each cylinder row temperature effectiveness, if effectively, then that asks for each cylinder averagely arranges temperature, and the row's of finding out temperature is the highest
Cylinder and row's minimum cylinder of temperature, if invalid, do not process；
C3, judge whether row's temperature of row's the highest cylinder of temperature and row's minimum cylinder of temperature exceedes row's temperature and limit, particularly as follows:
Formula delt_t=cyl_t-avg_t is utilized to calculate row's temperature amount of exceeding of cylinder, wherein: delt_t exceedes for row's temperature
Amount, avg_t is for averagely to arrange temperature, and cyl_t is row's temperature of single cylinder；
Judge to arrange the temperature amount of exceeding whether in the range of row's temperature limits, if, then it represents that row's temperature of this cylinder is beyond row's temperature limit
System, then need to revise the fuel quantity of this cylinder, if not, then it represents that row's temperature of this cylinder limits not less than row's temperature, then need not revise this
The fuel quantity of cylinder；
C4, the fuel quantity of correction cylinder, particularly as follows:
Formula m '=m-delt_t*alpha is utilized to calculate the revised fuel quantity of cylinder, wherein: m ' is for revising after-burning doses；
M is fuel quantity before revising；Alpha is strength factor.
MAP look-up table is used to control the timing of catching fire under each operating mode, particularly as follows:
The rotating speed retrieval of diesel oil amount based on injection and the electromotor positive seasonal pulse spectrogram that catches fire controls the micro-spray of diesel oil and ignites
Natural gas formula double fuel machine control system in different modes, the timing of catching fire of different operating mode；
The described positive seasonal pulse spectrogram that catches fire is the arteries and veins spectrum determining timing of catching fire with the output valve of diesel oil amount, rotating speed for parameter
Figure, and the injection advance angle that pure diesel fuel mode is different with the employing of double fuel module, under dual fuel mode, low speed and high speed are the most not
Different injection advance angles is used with operating mode.
The invention have the advantages that
(1) electromotor can be controlled and be operated in pure diesel fuel mode, or the dual fuel mode of primary combustion natural gas.
(2) amount of natural gas of each cylinder, district is accurately controlled by the gas trap in each cylinder inlet manifold of control electromotor
Not in the method sprayed inlet manifold, use manifold injection to be capable of the jet amount of each cylinder is accurately controlled, have
Effect prevents the gas blowby between each cylinder, and the advantage with fast response time.
(3) under main burning natural gas pattern, the substitution rate of diesel oil can reach 98%, under the most identical operating mode, and natural gas pattern
Under Pilot diesel quantity be only 2% under pure diesel fuel mode.
(4) injection of Pilot diesel quantity is realized by controlling electronically controlled unit pump, including the control to injection timing and distributive value
System, injection timing determines the ignition timing of natural gas.
(5) start diesel engine by pure diesel oil mode, run to after having started specify operating mode, then switch to double fuel mould
Formula；There is the risk of unburned natural gas leaking because dual fuel mode starts diesel engine, use pure diesel fuel mode to start and more pacify
Entirely, more reliable.
(6) use ladder fall oil process to realize the switching to dual fuel mode of the pure diesel fuel mode, use ladder fall combustion gas method real
The existing dual fuel mode switching to pure diesel fuel mode, it is possible to realize a smooth transition, the fluctuation of mode handover procedure medium speed is less than
5%, switching time is less than 1 minute.
(7) being applicable to the power high-power diesel engine at more than 800KW, the range of speeds is 0～2000r/min, diesel engine
Cylinder diameter is less than 8 cylinders from 170mm～350mm scope, cylinder number.
(8) row's of have employed temperature correction algorithm, with the uniformity of cylinder each under balanced gas or diesel fuel mode, each cylinder row's temperature is not
Uniformity can be controlled in ± 25 degrees Celsius, so that the load of each cylinder and row's temperature are uniformly, extends the life-span of electromotor.Effectively prevent
A certain cylinder overload causes scuffing of cylinder bore, and the control of cylinder uniformity is significant for dual fuel mode simultaneously, be to prevent
Certain cylinder catches fire, and causes unburned HC to enter into the important means of exhaust duct blast.
(9) have employed the mode that MAP tables look-up, different mode, under different operating modes, the moment that diesel oil sprays into is different, thus
The moment enabling combustion of natural gas controls flexibly, it is ensured that burning optimum, and the consumption of natural gas is minimum.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the present invention；
Fig. 2 is the flow chart of ladder fall oil process in the present invention；
Fig. 3 is the flow chart of ladder fall combustion gas method in the present invention；
Fig. 4 is the flow chart of row's temperature revised law in the present invention.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.
The micro-spray of diesel oil as shown in Figure 1 is ignited natural gas formula double fuel machine control system, including monitoring cabinet 1, monoblock pump control
Unit 2 processed, natural gas control unit 3 and sensor group 5.
Described monitoring cabinet 1 has human-computer interaction interface, is used for showing various monitoring information and sending operational order, this monitoring
Cabinet 1 is connected with monoblock pump control unit 2, natural gas control unit 3 respectively.Operator is by man-machine interaction circle at monitoring cabinet 1
Sending mode switching command on face.
The signal gathered is sent to monoblock pump control unit 2, natural gas control unit 3, this biography by described sensor group 5
Sensor group 5 is connected with monoblock pump control unit 2, natural gas control unit 3 respectively.
Described monoblock pump control unit 2 is connected with the electronically controlled unit pump 7 on electromotor 4, described natural gas control unit 3 with
Gas trap 6 in each cylinder inlet manifold of electromotor 4 connects.Under pure diesel fuel mode and dual fuel mode, monoblock pump controls single
Signal and operational order that unit 2 is gathered based on sensor group 5 control electronically controlled unit pump 7, electronically controlled unit pump 7 control diesel oil
Emitted dose and injection timing；The phase place of diesel engine is obtained by bent axle and speed probe, on the basis of compression top center, logical
Cross the current length and the starting point of electric current controlled in electronically controlled unit pump 7 electromagnetic valve, it is achieved injection timing and the emitted dose to diesel oil
Control.The oil mass of electronically controlled unit pump 7 is relevant with the initial point of its solenoid valves electric current and current duration, and physical relationship needs
Experiment to be passed through is measured.Under dual fuel mode, signal that natural gas control unit 3 is gathered based on sensor group 5 and behaviour
The switch making the instruction each gas trap 6 of control controls amount of natural gas.Specifically, by bent axle and cam speed probe, identify
Go out the phase place of current diesel engine, with air inlet top dead centre for controlling benchmark, control the opening time of each gas trap 6, and then control
The inlet of natural gas.
The present invention accurately controls the natural gas of each cylinder by the gas trap 6 in each cylinder inlet manifold of control electromotor 4
Amount, is different from the method in inlet manifold's injection, uses manifold injection, it is possible to realize accurately controlling the jet amount of each cylinder
System, effectively prevents the gas blowby between each cylinder, and the advantage with fast response time.
Heretofore described sensor group 5 includes following 10 multiple sensors, is respectively used to detect 10 multi-signals, sees
Table 1:
| Signal name | Signal type |
| Engine crankshaft signals | 24V pulse signal |
| Engine cam signal | 24V pulse signal |
| Cooling water enters machine pressure | 4～20mA |
| Cooling water temperature | PT100 |
| Fuel pressure | 4～20mA |
| Charge-air pressure | 4～20mA |
| Charge-air temperature | PT100 |
| Lubricating oil pressure | 4～20mA |
| Oil temperature | PT100 |
| 1～8 cylinder exhaust temperature sensors | K-type thermocouple |
| 2 house steward's exhaust temperature sensors | K-type thermocouple |
| By gaseous-pressure _ machine | 4～20mA |
| Before gaseous-pressure _ valve | 4～20mA |
Wherein:
1. engine crankshaft signals: calculate the rotating speed of electromotor, coordinates cam signal, more accurate calculating to start simultaneously
The phase place of machine 4.
2. engine cam signal: identify the phase place of electromotor, so that it is determined that compression top center and air inlet top dead centre two
Key position, as controlling diesel injection and the benchmark of fuel gas injection.
3. cooling water enters machine pressure: whether monitoring electromotor has cooling water in normal circulation, prevents engine overheat.
4. cooling water temperature: the cooling water temperature of monitoring electromotor is the most too high, if too high, needs to shut down.
5. fuel pressure: whether the diesel oil of monitoring electromotor supplies normally.
6. charge-air pressure: whether the admission pressure of monitoring electromotor is within normal range, and charge-air pressure is sky
So admission pressure of gas, this pressure must be in OK range, if hypertonia will affect the air inflow of natural gas.
7. charge-air temperature: whether the intake air temperature of monitoring electromotor is within normal range, if intake air temperature is too high, then
Natural gas meeting advanced combustion, thus cause combustion knock.
8. lubricating oil pressure: the lubricating oil pressure of monitoring electromotor, if lubricating oil pressure is too low, shows that lubricating oil is fed with
Problem, needs to shut down.
9. oil temperature: the temperature of monitoring engine lubricating oil is the most normal, and high oil temperature then shows the cooling of electromotor
Problematic, the lubricant effect of lubricating oil can weaken simultaneously.
10. exhaust temperature sensor: the delivery temperature of monitoring electromotor, provides every cylinder for each cylinder inhomogeneities correction algorithm simultaneously
Row's temperature, calculate the correction of each cylinder.
11. gaseous-pressures: the pressure of monitoring natural gas, thus judge whether electromotor possesses and be switched to natural gas from diesel oil
Condition, if gaseous-pressure is too high, gas valve will be unable to open, the most just can not carry out oil and cut the process of gas.
A kind of micro-spray of diesel oil of the present invention is ignited natural gas formula double fuel machine control method, uses as described herein
The micro-spray of diesel oil ignite natural gas formula double fuel machine control system；Its control method includes:
Step one, under pure diesel fuel mode, start diesel engine, realize the spray of Pilot diesel quantity by controlling electronically controlled unit pump 7
Penetrate, including the control to emitted dose and injection timing.The natural diarrhea due to stagnation of QI of unburned is there is owing to dual fuel mode starts diesel engine
The risk of leakage, uses pure diesel fuel mode to start safer, more reliable.
Step 2, pure diesel fuel mode switch to dual fuel mode:
2a, after startup completes, when operator select enter dual fuel mode time, i.e. system receive entrance double fuel mould
Formula control instruction；
Based on the signal that sensor group 5 is gathered, 2b, monoblock pump control unit 2 judge that the micro-spray of diesel oil natural gas formula of igniting is double
Whether fuel machine system meets pre-set double fuel uses condition, if meeting, then enters step 2c；If being unsatisfactory for, then
Repeat this step；
2c, monitoring cabinet 1 send double fuel enable signal to monoblock pump control unit 2, natural gas control units 3；Monoblock pump
Control unit 2, natural gas control unit 3 based on double fuel enable signal, use ladder fall oil process realize pure diesel fuel mode to
The switching of dual fuel mode.
Under dual fuel mode, the substitution rate of diesel oil can reach 98%.Electronically controlled unit pump 7 is capable of the essence of small oil mass
Really control, and can accomplish that distributive value and injection timing independently control, by optimizing injection timing, it is possible to ensure at trace
The natural gas that ignites stable when diesel oil sprays into, major part operating mode is all capable of the substitution rate of more than 98%.Diesel oil substitution rate meter
Calculation formula is as follows: r=mf/mg；Wherein, defining oil consumption under pure diesel fuel mode is mf, the diesel oil oil consumption under definition dual fuel mode is
mg, substitution rate is r, and substitution rate measures substitution rate to be needed to measure the diesel consumption rate of different mode under same operating for twice.
Under dual fuel mode, the substitution rate of diesel oil can reach 98%；Realized by " micro-spray " diesel oil, namely pass through
Controlling the amount of diesel oil is to be just met for igniting the amount of natural gas, and this " micro-spray " can not be realized by traditional mechanical type oil pump
's.
Step 3, exit dual fuel mode:
3a, when operator select exit dual fuel mode time, i.e. system receives and exits dual fuel mode control instruction；
3b, monitoring cabinet 1 send exit dual fuel mode signal to monoblock pump control unit 2, natural gas control units 3；
3c, monoblock pump control unit 2, natural gas control unit 3 use ladder fall combustion based on exiting dual fuel mode signal
Gas method realizes the dual fuel mode switching to pure diesel fuel mode；
In described step one to step 3, the inequality of each cylinder row's temperature is controlled by the row's of additionally using temperature correction algorithm
System；MAP look-up table is used to control the timing of catching fire under each operating mode.
As in figure 2 it is shown, described ladder fall oil process comprises the following steps:
A1, entrance dual fuel mode switching start；
A2, the emitted dose of diesel oil the most progressively decline；
A3, according to the actual speed of electromotor 4 and the deviation of rotating speed of target as input, after being regulated by PID, export gas
The opening time of body valve 6, the rotating speed of closed loop control electromotor 4；
A4, judge whether the emitted dose of diesel oil arrives minimum diesel oil amount, the most then diesel oil amount keeps minimum constant, i.e. cuts
Change, entered dual fuel mode, if it is not, then return step A2.
The present invention is by gradually reducing the diesel injection amount of current working, it is possible to realize a smooth transition.Speed fluctuation rate is low
In 5%, it is shorter than 1 minute switching time.
As it is shown on figure 3, described ladder fall combustion gas method comprises the following steps:
B1, exit dual fuel mode switching start；
B2, amount of natural gas the most progressively decline；
B3, according to the actual speed of electromotor 4 and the deviation of rotating speed of target as input, by PID closed loop control diesel oil
Emitted dose, with the rotating speed of stable electromotor.
B4, judge whether gas quantity is 0, the most i.e. switched, entered pure diesel fuel mode, if it is not, then return step
B2。
The present invention is by being stepped up the diesel injection amount of current working, it is possible to realize a smooth transition.Speed fluctuation rate is low
In 5%, it is shorter than 1 minute switching time.
As shown in Figure 4, the inhomogeneities of each cylinder row's temperature is controlled by the row's of employing temperature correction algorithm, particularly as follows:
C1, gather each cylinder row temperature.
C2, judge to each cylinder row temperature effectiveness, if effectively, then that asks for each cylinder averagely arranges temperature, and the row's of finding out temperature is the highest
Cylinder and row's minimum cylinder of temperature, if invalid, do not process.
C3, judge whether row's temperature of row's the highest cylinder of temperature and row's minimum cylinder of temperature exceedes row's temperature and limit, particularly as follows:
Formula delt_t=cyl_t-avg_t is utilized to calculate row's temperature amount of exceeding of cylinder, wherein: delt_t exceedes for row's temperature
Amount, avg_t is for averagely to arrange temperature, and cyl_t is row's temperature of single cylinder.
Judge to arrange the temperature amount of exceeding whether in the range of row's temperature limits, if, then it represents that row's temperature of this cylinder is beyond row's temperature limit
System, then need to revise the fuel quantity of this cylinder, if not, then it represents that row's temperature of this cylinder limits not less than row's temperature, then need not revise this
The fuel quantity of cylinder.
C4, the fuel quantity of correction cylinder, particularly as follows:
Formula m '=m-delt_t*alpha is utilized to calculate the revised fuel quantity of cylinder, wherein: m ' is for revising after-burning doses；
M is fuel quantity before revising；Alpha is strength factor.
The row's of have employed temperature correction algorithm, the inhomogeneities of each cylinder row's temperature can be controlled in ± 25 degrees Celsius.High-power engine 4
Cylinder uniformity needs to be controlled effectively, to prevent a certain cylinder overload from causing scuffing of cylinder bore.The control of cylinder uniformity simultaneously
Make significant for dual fuel mode, be to prevent certain cylinder to catch fire, cause unburned HC to enter into the important of exhaust duct blast
Means.
MAP look-up table is used to control the timing of catching fire under each operating mode, particularly as follows:
The rotating speed retrieval of diesel oil amount based on injection and the electromotor 4 positive seasonal pulse spectrogram that catches fire controls the micro-spray of diesel oil and draws
Combustion natural gas formula double fuel machine control system in different modes, the timing of catching fire of different operating mode.
See table 2, described in the positive seasonal pulse spectrogram that catches fire be to determine, for parameter, timing of catching fire with the output valve of diesel oil amount, rotating speed
Arteries and veins spectrogram, pure diesel fuel mode and dual fuel mode must use different injection advance angles, can optimize two kinds of different moulds
Combustion process under formula, simultaneously under dual fuel mode, low speed also needs to be respectively provided with, just with the advance angle under different operating modes at a high speed
Can guarantee that burning optimum, the consumption of natural gas is minimum.
Table 2.
Claims (5)
1. the micro-spray of diesel oil is ignited natural gas formula double fuel machine control system, it is characterised in that: include monitoring cabinet (1), monomer
Pump control unit (2), natural gas control unit (3) and sensor group (5)；
Described monitoring cabinet (1) has human-computer interaction interface, is used for showing various monitoring information and sending operational order, this monitoring cabinet
(1) it is connected with monoblock pump control unit (2), natural gas control unit (3) respectively；
The signal gathered is sent to monoblock pump control unit (2), natural gas control unit (3) by described sensor group (5), should
Sensor group (5) is connected with monoblock pump control unit (2), natural gas control unit (3) respectively；
Described monoblock pump control unit (2) is connected with the electronically controlled unit pump (7) on electromotor (4), described natural gas control unit
(3) it is connected with the gas trap (6) in each cylinder inlet manifold of electromotor (4)；Under pure diesel fuel mode and dual fuel mode, monomer
Signal and operational order that pump control unit (2) is gathered based on sensor group (5) control electronically controlled unit pump (7), by automatically controlled
Monoblock pump (7) controls emitted dose and the injection timing of diesel oil；Under dual fuel mode, natural gas control unit (3) is based on sensing
Signal and operational order that device group (5) is gathered control the switch of each gas trap (6) to control amount of natural gas.
2. the micro-spray of diesel oil is ignited natural gas formula double fuel machine control method, it is characterised in that: use as claimed in claim 1
The micro-spray of diesel oil ignite natural gas formula double fuel machine control system；Its control method includes:
Step one, under pure diesel fuel mode, start diesel engine, realize the spray of Pilot diesel quantity by controlling electronically controlled unit pump (7)
Penetrate, including the control to emitted dose and injection timing；
Step 2, pure diesel fuel mode switch to dual fuel mode:
2a, after startup completes, system receive entrance dual fuel mode control instruction；
2b, monoblock pump control unit (2) judge that whether the micro-spray of diesel oil natural gas formula double fuel machine system of igniting meets and preset
Good double fuel uses condition, if meeting, then enters step 2c；If being unsatisfactory for, then repeat this step；
2c, monitoring cabinet (1) send double fuel enable signal to monoblock pump control unit (2), natural gas control units (3)；Monomer
Pump control unit (2), natural gas control unit (3) enable signal based on double fuel, use ladder fall oil process to realize pure diesel oil
Pattern is to the switching of dual fuel mode；
Step 3, exit dual fuel mode:
3a, system receive and exit dual fuel mode control instruction；
3b, monitoring cabinet (1) send exit dual fuel mode signal to monoblock pump control unit (2), natural gas control units (3)；
3c, monoblock pump control unit (2), natural gas control unit (3) use ladder fall combustion based on exiting dual fuel mode signal
Gas method realizes the dual fuel mode switching to pure diesel fuel mode；
In described step one to step 3, the inequality of each cylinder row's temperature is controlled by the row's of additionally using temperature correction algorithm；Adopt
The timing of catching fire under each operating mode is controlled with MAP look-up table.
The micro-spray of diesel oil the most according to claim 2 is ignited natural gas formula double fuel machine control method, it is characterised in that: described
Ladder fall oil process comprises the following steps:
A1, entrance dual fuel mode switching start；
A 2, the emitted dose of diesel oil the most progressively decline；
A 3, according to the actual speed of electromotor (4) and the deviation of rotating speed of target as input, after being regulated by PID, export gas
The opening time of body valve (6), the rotating speed of closed loop control electromotor (4)；
A 4, judge whether the emitted dose of diesel oil arrives minimum diesel oil amount, the most then diesel oil amount keeps minimum constant, has i.e. switched
Become, enter dual fuel mode, if it is not, then return step A2；
Described ladder fall combustion gas method comprises the following steps:
B1, exit dual fuel mode switching start；
B2, amount of natural gas the most progressively decline；
B3, according to the actual speed of electromotor (4) and the deviation of rotating speed of target as input, by PID closed loop control diesel oil
Emitted dose, with the rotating speed of stable electromotor
B4, judge whether gas quantity is 0, the most i.e. switched, entered pure diesel fuel mode, if it is not, then return step B 2.
4. ignite natural gas formula double fuel machine control method according to the micro-spray of the diesel oil described in Claims 2 or 3, it is characterised in that:
The inhomogeneities of each cylinder row's temperature is controlled by the row's of employing temperature correction algorithm, particularly as follows:
C1, gather each cylinder row temperature；
C2, judging the effectiveness of each cylinder row's temperature, if effectively, then that asks for each cylinder averagely arranges temperature, and the highest cylinder of the row of finding out temperature with
The cylinder that row's temperature is minimum, if invalid, does not processes；
C3, judge whether row's temperature of row's the highest cylinder of temperature and row's minimum cylinder of temperature exceedes row's temperature and limit, particularly as follows:
Formula delt_t=cyl_t-avg_t is utilized to calculate row's temperature amount of exceeding of cylinder, wherein: delt_t exceedes for row's temperature
Amount, avg_t is for averagely to arrange temperature, and cyl_t is row's temperature of single cylinder；
Judge to arrange the temperature amount of exceeding whether in the range of row's temperature limits, if, then it represents that row's temperature of this cylinder limits, then beyond row's temperature
Need to revise the fuel quantity of this cylinder, if not, then it represents that row's temperature of this cylinder limits not less than row's temperature, then need not revise the combustion of this cylinder
Doses；
C4, the fuel quantity of correction cylinder, particularly as follows:
Formula m '=m-delt_t * alpha is utilized to calculate the revised fuel quantity of cylinder, wherein: m ' is for revising post fuel
Amount；M is fuel quantity before revising；Alpha is strength factor.
5. ignite natural gas formula double fuel machine control method according to the micro-spray of the diesel oil described in Claims 2 or 3, it is characterised in that:
MAP look-up table is used to control the timing of catching fire under each operating mode, particularly as follows:
The rotating speed retrieval of diesel oil amount based on injection and electromotor (4) the positive seasonal pulse spectrogram that catches fire controls the micro-spray of diesel oil and ignites
Natural gas formula double fuel machine control system in different modes, the timing of catching fire of different operating mode；
The described positive seasonal pulse spectrogram that catches fire is the arteries and veins spectrogram determining timing of catching fire with the output valve of diesel oil amount, rotating speed for parameter, and
Pure diesel fuel mode uses different injection advance angles with double fuel module, under dual fuel mode, and low speed and different operating modes at a high speed
Use different injection advance angles.
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| CN108930597A (en) * | 2018-07-02 | 2018-12-04 | 武汉理工大学 | Ship use intermediate speed dual fuel engine control method and system based on rapid control prototyping |
| CN110080898A (en) * | 2019-04-09 | 2019-08-02 | 哈尔滨工程大学 | Micro- dual fuel engine dcs timing synchronous method that ignites |
| CN111156093A (en) * | 2019-12-31 | 2020-05-15 | 潍柴动力股份有限公司 | Control method and device for diesel-alcohol dual-fuel engine |
| CN113074056A (en) * | 2021-03-31 | 2021-07-06 | 潍柴重机股份有限公司 | Full-working-condition diesel micro-injection ignition control method |
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| CN113606047A (en) * | 2021-10-08 | 2021-11-05 | 潍坊力创电子科技有限公司 | Micro-jet gas engine control system with 30% power diesel mode reserved and implementation method thereof |
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| CN113606047A (en) * | 2021-10-08 | 2021-11-05 | 潍坊力创电子科技有限公司 | Micro-jet gas engine control system with 30% power diesel mode reserved and implementation method thereof |
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Application publication date: 20161207 |