CN106930850A - Dual fuel engine system and its control method, vehicle - Google Patents
Dual fuel engine system and its control method, vehicle Download PDFInfo
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- CN106930850A CN106930850A CN201511019393.1A CN201511019393A CN106930850A CN 106930850 A CN106930850 A CN 106930850A CN 201511019393 A CN201511019393 A CN 201511019393A CN 106930850 A CN106930850 A CN 106930850A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/02—Gas passages between engine outlet and pump drive, e.g. reservoirs
- F02B37/025—Multiple scrolls or multiple gas passages guiding the gas to the pump drive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/20—Control of the pumps by increasing exhaust energy, e.g. using combustion chamber by after-burning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
- F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
-
- 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
- F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/032—Producing and adding steam
- F02M25/035—Producing and adding steam into the charge intakes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides a kind of dual fuel engine system and its control method, vehicle, the system includes：Engine；For the diesel injector to vapour cylinder injection diesel oil；Spray gasoline ejector and exhaust combustion chamber, are vented combustion chamber and are connected with exhaust duct afterwards, and gasoline ejector is sprayed afterwards to be used for injected petrol in exhaust combustion chamber；Booster, connects with exhaust combustion chamber；Exhaust cooling device, between exhaust combustion chamber and booster, with to being cooled down into the gas of booster from exhaust combustion chamber；Controller, for temperature before the whirlpool for obtaining engine water temperature, gas pedal rate of change and booster, and the start and stop of the rear spray according to the start and stop and diesel injector of engine water gentle gas pedal rate of change control gasoline ejector, and according to the start and stop of temperature control exhaust cooling device before the whirlpool of booster.The present invention can improve the acceleration of dual fuel engine, and make full use of exhaust energy, transient state oil consumption when accelerating be reduced, so as to reduce discharge.
Description
Technical field
The present invention relates to automobile technical field, more particularly to a kind of dual fuel engine system and its control system, vehicle.
Background technology
Environmental problem, energy crisis, harsh discharge and the appearance of fuel economy regulation, are that internal combustion engine industry proposes stern challenge.
Drop oil consumption, settling-discharging are two most crucial at present problems.
Conventional engines are broadly divided into gasoline engine and diesel engine, and gasoline exhaust is preferable, but its ignition way determines its fuel-economy
Property it is poor, the mode of diesel engine compression and combustion ensure that fuel economy, but corresponding NOX and other discharges are higher.By vapour
Oil, the technology of diesel engine are combined, and reach oil consumption and discharge double down, therefore a kind of new technology is brought into schedule now, double fuel hair
Motivation.The dual fuel engine thermal efficiency is more taller compared with gasoline engine, discharges low compared with diesel engine.
Dual fuel engine uses gasoline intake port injection, diesel oil cylinder injection to ignite gasoline, this kind of spray regime for oil consumption and
The emission performance of NOX and Soot has very big optimization, but this technology has a defect, i.e. mapping is slightly worse.In anxious acceleration
When, the more conventional diesel engine of its acceleration is poor.It is unstable in preceding several recycle gasolines penetrating after-combustions during mainly due to anxious acceleration,
Delivery temperature pressure is caused not increase considerably, therefore turbocharger can not be operated well, boost pressure is not kept pace with.
So wanting to improve acceleration, it is necessary to improve boost pressure during acceleration, it is therefore desirable to increase instantaneous delivery temperature pressure.
The content of the invention
In view of this, the present invention is directed to propose a kind of dual fuel engine system, the system can improve dual fuel engine plus
Fast performance, and exhaust energy is made full use of, transient state oil consumption when accelerating is reduced, so as to reduce discharge.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of dual fuel engine system, including：Engine；For the diesel oil spray of the vapour cylinder injection diesel oil to the engine
Oily device；Spray gasoline ejector and exhaust combustion chamber afterwards, the exhaust combustion chamber is connected with the exhaust duct of the engine, it is described after
Spray gasoline ejector is used for injected petrol in the exhaust combustion chamber；Booster, the booster connects with the exhaust combustion chamber
It is logical；Exhaust cooling device, the exhaust cooling device is located between the exhaust combustion chamber and the booster, with to from described
Exhaust combustion chamber is cooled down into the gas of the booster；And controller, the controller be used for obtain engine water temperature,
Temperature before the whirlpool of gas pedal rate of change and the booster, and according to the gentle gas pedal rate of change control of the engine water
The start and stop of the rear spray of the start and stop and the diesel injector of spray gasoline ejector after described, and according to temperature before the whirlpool of the booster
The start and stop of the degree control exhaust cooling device.
Further, the controller is used to, when temperature before the whirlpool of the booster is higher than the first preset temperature, control the row
Air cooling device starts.
Further, the controller is according to the gentle gas pedal rate of change control of the engine water rear spray gasoline ejector
Start and stop and the diesel injector rear spray start and stop, specifically include：The engine is judged according to the engine water temperature
Mode of operation, wherein, when the engine water temperature is higher than the second preset temperature, judge that the engine is in normal temperature pattern,
When the engine water temperature is less than the second preset temperature, judge that the engine is in low temperature mode；If at the engine
In normal temperature pattern, then gas pedal rate of change is obtained, and when the gas pedal rate of change is less than the first default rate of change, control
Make after the diesel injector starts and spray, and the oil spout phase sprayed after controlling is delayed, and in the gas pedal rate of change more than the
One default rate of change and during less than the second default rate of change, controls the diesel injector to be sprayed after starting, and stepped in the throttle
When plate rate of change presets rate of change more than second and presets rate of change less than the 3rd, the rear spray gasoline ejector startup is controlled, with
And when the gas pedal rate of change is more than the described 3rd default rate of change, control the diesel injector to be sprayed after starting, and control
Spray gasoline ejector starts after system is described, wherein, the described first default rate of change is less than the second default rate of change, and described second is pre-
If rate of change is less than the 3rd default rate of change；And if the engine is in low temperature mode, then gas pedal rate of change is obtained,
And when the gas pedal rate of change is more than 0, control the diesel injector to be sprayed after starting, and control the rear spray gasoline to spray
Whether oily device starts, and when the gas pedal rate of change is 0, determines whether engine in starting state, and in institute
When stating engine in starting state, control the diesel injector to be sprayed after stopping, and control the rear gasoline ejector that sprays to shut down,
Otherwise control the diesel injector to be sprayed after starting, and control the rear spray gasoline ejector to start.
Further, also include：Pressure stabilizing cavity, one end of the pressure stabilizing cavity passes through pressure stabilizing cavity check valve and the exhaust cooling device
It is connected, the other end is connected by controlling valve with engine aspirating system, the pressure stabilizing cavity is used to store from the exhaust cooling dress
The vapor put, and the vapor is imported to the engine aspirating system when the control valve is opened, wherein, it is described steady
Pressure chamber includes pressure stabilizing cavity relief valve.
Further, first preset temperature is 800 DEG C.
Further, second preset temperature is 80 DEG C.
Relative to prior art, dual fuel engine system of the present invention has the advantage that：
Dual fuel engine system of the present invention, sprays gasoline ejector and booster after increased, and can be according to engine
Temperature is to rear spray gasoline ejector, the rear spray and exhaust of diesel injector before the whirlpool of water temperature, gas pedal rate of change and booster
The start and stop of cooling device are accordingly controlled, so that the working condition of more precise control booster, reduces sluggishness when accelerating and show
As improving the acceleration of dual fuel engine.In addition, taking full advantage of exhaust energy, transient state oil consumption during acceleration is reduced,
So as to reduce discharge.
It is another object of the present invention to propose a kind of control method of dual fuel engine system, the method can improve double combustions
Material pick-up of engine, and exhaust energy is made full use of, transient state oil consumption when accelerating is reduced, so as to reduce discharge.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of control method of dual fuel engine system, the dual fuel engine system is described in the above embodiment of the present invention
Dual fuel engine system, the control method is comprised the following steps：Obtain engine water temperature, gas pedal rate of change and institute
State temperature before the whirlpool of booster；According to opening for the gentle gas pedal rate of change control rear spray gasoline ejector of the engine water
Stop the start and stop with the rear spray of the diesel injector；And according to temperature control before the whirlpool of the booster exhaust cooling device
Start and stop.
Further, the start and stop of the exhaust cooling device according to temperature control before the whirlpool of the booster, further include：
Whether temperature is higher than the first preset temperature before judging the whirlpool of the booster；If temperature is higher than described the before the whirlpool of the booster
One preset temperature, then control the exhaust cooling device to start, and otherwise controls the exhaust cooling device to shut down.
Further, the start and stop according to the gentle gas pedal rate of change control of engine water spray gasoline ejector after described
With the start and stop of the rear spray of the diesel injector, further include：The work of the engine is judged according to the engine water temperature
Pattern, wherein, when the engine water temperature is higher than the second preset temperature, judge that the engine is in normal temperature pattern, work as institute
When stating engine water temperature less than the second preset temperature, judge that the engine is in low temperature mode；If the engine is in normal
Warm pattern, then obtain gas pedal rate of change, and when the gas pedal rate of change is less than the first default rate of change, control institute
State after diesel injector starts and spray, and the oil spout phase sprayed after control is delayed, and it is pre- more than first in the gas pedal rate of change
If rate of change and during less than the second default rate of change, the diesel injector is controlled to be sprayed after starting, and in gas pedal change
When rate presets rate of change more than second and presets rate of change less than the 3rd, the rear spray gasoline ejector startup is controlled, and in institute
When stating gas pedal rate of change more than the described 3rd default rate of change, the diesel injector is controlled to be sprayed after starting, and control described
Spray gasoline ejector starts afterwards, wherein, the described first default rate of change is less than the second default rate of change, the described second default change
Rate is less than the 3rd default rate of change；If the engine is in low temperature mode, gas pedal rate of change is obtained, and described
When gas pedal rate of change is more than 0, control the diesel injector to be sprayed after starting, and control the rear spray gasoline ejector to start,
And when the gas pedal rate of change is 0, whether engine is determined whether in starting state, and at the engine
When starting state, control the diesel injector to be sprayed after stopping, and control the rear spray gasoline ejector to shut down, otherwise control
The diesel injector sprays after starting, and controls the rear spray gasoline ejector to start.
The control method of described dual fuel engine system is had with above-mentioned dual fuel engine system relative to prior art
Some Dominant Facies are same, will not be repeated here.
It is another object of the present invention to propose a kind of vehicle, the vehicle can improve the acceleration of dual fuel engine, and
Exhaust energy is made full use of, transient state oil consumption when accelerating is reduced, so as to reduce discharge.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of vehicle, is provided with the dual fuel engine system as described in above-mentioned embodiment.
Described vehicle had the advantage that relative to prior art with above-mentioned dual fuel engine system it is identical, herein no longer go to live in the household of one's in-laws on getting married
State.
Brief description of the drawings
The accompanying drawing for constituting a part of the invention is used for providing a further understanding of the present invention, illustrative examples of the invention and
It illustrates, for explaining the present invention, not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of the dual fuel engine system described in the embodiment of the present invention；
Fig. 2 is the control model schematic diagram of the dual fuel engine system described in the embodiment of the present invention；And
Fig. 3 is the flow chart of the control method of the dual fuel engine system described in the embodiment of the present invention.
Description of reference numerals：
Gasoline ejector, 4- exhausts combustion chamber, 5- exhaust cooling devices, 5-1- are sprayed after 1- gasoline ejectors, 2- diesel injectors, 3-
Temperature sensor, 8-1 pressure stabilizing cavities check valve, 8-2 pressure stabilizing cavities are let out before water jet, 5-2- evaporation heat sinks, 6- boosters, 7- whirlpools
Pressure valve, 8-3 pressure stabilizing cavities, 9- control valves.
Specific embodiment
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can be mutually combined.
Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 1 is the structural representation of dual fuel engine system according to an embodiment of the invention.Fig. 2 is according to the present invention one
The control model schematic diagram of the dual fuel engine system of individual embodiment.
As shown in figure 1, Fig. 2 is simultaneously combined, dual fuel engine system according to an embodiment of the invention, including：Engine
(not shown), diesel injector 2, rear spray gasoline ejector 3, exhaust combustion chamber 4, booster 6, exhaust cooling dress
Put 5 and controller (not shown).
Wherein, diesel injector 2 is used for the vapour cylinder injection diesel oil to engine.Specifically, diesel injector 2 has two
Plant fuel injection mode, i.e. main jet and rear spray.Main jet phase before rear spray, running always by main jet pattern, to ensure engine just
Whether often operating, the startup then sprayed is needed according to actual conditions control, i.e., after spray simply just start when needed.Exhaust burning
Chamber 4 is connected with the exhaust duct of engine, and gasoline ejector 3 is sprayed afterwards to be used for injected petrol in exhaust combustion chamber 4, using high temperature
Waste gas ignites gasoline, produces high temperature and high pressure gas, and moment promotes booster 6 to be pressurized.Booster 6 connects with exhaust combustion chamber 4
It is logical.Exhaust cooling device 5 for example includes water jet 5-1 and evaporation heat sink 5-2, and exhaust cooling device 5 is located at exhaust and burns
Between chamber 4 and booster 6, with to being cooled down into the gas of booster 6 from exhaust combustion chamber 4.Controller is used to obtain
Temperature before the whirlpool of engine water temperature, gas pedal rate of change and booster 6, and according to the gentle gas pedal change of engine water
The start and stop of the rear spray of the start and stop and diesel injector 2 of gasoline ejector 3 are sprayed after rate control, and according to temperature before the whirlpool of booster 6
The start and stop of degree control exhaust cooling device 5.
More specifically, for example, controller is used for when it is higher than the first preset temperature to enter the temperature of gas of booster 6, control
Exhaust cooling device processed 5 starts.In some instances, for example, the first preset temperature is 800 DEG C, for example, with reference to Fig. 2,
Temperature before the whirlpool of booster 6, when temperature is higher than 20 DEG C before the whirlpool of booster 6, control are detected by temperature sensor before whirlpool 7
Device control exhaust cooling device 5 starts a pair gas into booster 6 and is lowered the temperature.Specifically operate and be：Water jet 5-1
Spray water and be sprayed onto on evaporation heat sink 5-2, water runs into evaporation endothermic after high temperature, reduce delivery temperature, water is heated to form high temperature
High-pressure steam.
In specific example, with reference to shown in Fig. 2, controller is, for example, Engine ECU, its collection engine water temperature, and oil
The data such as door pedal rate of change, and the state of engine is divided into low temperature mode and normal temperature pattern according to these data.Further,
Low temperature mode for example includes that cold start mode, warming-up pattern and low temperature accelerate pattern；Normal temperature pattern for example includes depth boost mode
A, B, C and normal temperature normal supercharging pattern.
In one embodiment of the invention, for example, controller sprays vapour after being controlled according to the gentle gas pedal rate of change of engine water
The start and stop of oily fuel injector 3 and the start and stop of the rear spray of diesel injector 2, specifically include：
First, the mode of operation of engine is judged according to engine water temperature, wherein, when engine water temperature is higher than the second preset temperature
When, judge that engine is in normal temperature pattern, when engine water temperature is less than the second preset temperature, judge that engine is in low temperature mould
Formula.In some instances, the second preset temperature is, for example, 80 DEG C, namely when engine water temperature is higher than 80 DEG C, judges to start
Machine is in normal temperature pattern, otherwise judges that engine is in low temperature mode.
Further, if engine is in normal temperature pattern, gas pedal rate of change is obtained.
When gas pedal rate of change is less than the first default rate of change, now engine is determined in normal temperature normal supercharging pattern
When, control the diesel injector to be sprayed after starting, and the oil spout phase sprayed after control is delayed.Injection after a small amount of diesel oil is carried out,
And delayed using combustion phase, increase delivery temperature pressure, because now delivery temperature is relatively low, therefore does not start water jet 5-1,
The oil spout phase of diesel injector 2 is controlled to delay.
When gas pedal rate of change presets rate of change more than first and presets rate of change less than second, now engine is judged as
Normal-temperature deep boost mode A, now needs supercharging level smaller, therefore, control diesel injector 2 is sprayed come the row of raising after starting
Gas energy.Further, now delivery temperature is also possible to exceed the maximum temperature limit value of booster 6, in order to protect booster
6, water jet 5-1 is triggered, when delivery temperature exceedes limit value (i.e. the first preset temperature, for example, 800 DEG C), spray cooling.
When gas pedal rate of change presets rate of change more than second and presets rate of change less than the 3rd, now judge that engine is in
Normal-temperature deep boost mode B, and spray gasoline ejector 3 after controlling and start, gasoline is ignited gasoline after spraying into using high-temp waste gas,
Water jet 5-1 is triggered simultaneously, when delivery temperature exceedes limit value, spray cooling.Wherein, the first default rate of change is less than second
Default rate of change.
When gas pedal rate of change is more than the 3rd default rate of change, now judge that engine is in normal-temperature deep boost mode C,
And control diesel injector 2 to be sprayed after starting, and spray gasoline ejector 3 starts after control, while starting water jet 5-1.Now
Petrol and diesel oil multifuel combustion is produced in combustion chamber 4 is vented, strong high temperature and high pressure gas are produced, booster 6 is promoted, now supercharging level
It is maximum.Wherein, the second default rate of change is less than the 3rd default rate of change.
Further, if engine is in low temperature mode, gas pedal rate of change is obtained.
When gas pedal rate of change is more than 0, now judge that engine is in low temperature and accelerates pattern, then control diesel injector 2
Sprayed after startup, and gasoline ejector 3 is sprayed after control and started, while not starting water jet 5-1.
When gas pedal rate of change is 0, whether engine is determined whether in starting state, and be in judgement engine
During starting state, control diesel injector 2 is sprayed after stopping, and spray gasoline ejector 3 is shut down after control, while also not starting spray
Hydrophone 5-1, otherwise, i.e., when gas pedal rate of change is 0 and starts and when machine is not at starting state, now judge engine
In warming-up pattern, then diesel injector 2 is controlled to be sprayed after starting, and spray gasoline ejector 3 starts after control, accelerates booster
6 enter state, and preprocessor is brought rapidly up, but water jet 5-1 does not start.
It should be noted that in above-mentioned control process, exhaust cooling device 5 (including water jet 5-1 and evaporation heat sink
5-2) and before whirlpool temperature sensor 7 is closed-loop control, after water jet 5-1 starts, the temperature limit before delivery temperature will reach whirlpool
During system (i.e. the first preset temperature), spray cooling, the row's of holding temperature so ensures booster less than 800 DEG C of temperature limit before whirlpool
6 are in efficient region forever.
As shown in figure 1, in one embodiment of the invention, the dual fuel engine system for example also includes pressure stabilizing cavity 8-3.
One end of pressure stabilizing cavity 8-3 is connected by pressure stabilizing cavity check valve 8-1 with exhaust cooling device 5, and the other end is by controlling valve 9 with hair
Motivation gas handling system is connected, and pressure stabilizing cavity 8-3 is used to store the vapor from exhaust cooling device 5, and is opened in control valve 9
When to engine aspirating system be input into vapor, wherein, pressure stabilizing cavity 8-3 include pressure stabilizing cavity relief valve 8-2, to ensure pressure stabilizing cavity
Pressure stability in 8-3, pressure stabilizing cavity check valve 8-1 can prevent vapor to be back to exhaust cooling device 5.Specifically, typically
In the case of, the vapor that exhaust cooling device 6 is produced is stored in pressure stabilizing cavity 8-3, and (such as engine is born greatly when needing
Lotus produces the more regions of NOX), control valve 9 is opened, and vapor is imported in the cylinder of engine, participates in burning, is reduced
Ignition temperature, reduces DS NOx Est.
Dual fuel engine system according to embodiments of the present invention, sprays gasoline ejector and booster after increased, and being capable of basis
Temperature is to rear spray gasoline ejector, the rear spray of diesel injector before the whirlpool of engine water temperature, gas pedal rate of change and booster
And the start and stop of exhaust cooling device are accordingly controlled, so that the working condition of more precise control booster, reduces when accelerating
Hysteresis phenomenon, improves the acceleration of dual fuel engine.In addition, taking full advantage of exhaust energy, wink during acceleration is reduced
State oil consumption, so as to reduce discharge.
Further, as shown in figure 3, a kind of embodiment of the invention discloses that control method of dual fuel engine system.Its
In, the dual fuel engine system is, for example, the dual fuel engine system described by the above embodiment of the present invention.Based on this, should
Method is comprised the following steps：
Step S1：Obtain temperature before the whirlpool of engine water temperature, gas pedal rate of change and booster.
Step S2：According to start and stop and diesel injector that gasoline ejector is sprayed after the gentle gas pedal rate of change control of engine water
Rear spray start and stop.
Step S3：According to the start and stop of temperature control exhaust cooling device before the whirlpool of booster.
In one embodiment of the invention, described in step S2 according to the control of engine water gentle gas pedal rate of change after
The start and stop of the rear spray of the start and stop and diesel injector of gasoline ejector are sprayed, is further included：
First, the mode of operation of engine is judged according to engine water temperature, wherein, when engine water temperature is higher than the second preset temperature
When, judge that engine is in normal temperature pattern, when engine water temperature is less than the second preset temperature, judge that engine is in low temperature mould
Formula.In some instances, the second preset temperature is, for example, 80 DEG C, namely when engine water temperature is higher than 80 DEG C, judges to start
Machine is in normal temperature pattern, otherwise judges that engine is in low temperature mode.
If engine is in normal temperature pattern, gas pedal rate of change is obtained, and preset less than first in gas pedal rate of change
During rate of change, control diesel injector is sprayed after starting, and the oil spout phase sprayed after control is delayed, and big in gas pedal rate of change
When in the first default rate of change and presetting rate of change less than second, control diesel injector sprays after starting, and in gas pedal change
When rate presets rate of change more than second and presets rate of change less than the 3rd, gasoline ejector is sprayed after control and is started, and stepped in throttle
When plate rate of change is more than the 3rd default rate of change, sprayed after control diesel injector startup, and gasoline ejector sprayed after control and started,
Wherein, less than the second default rate of change, the second default rate of change is less than the 3rd default rate of change for the first default rate of change.
Further, if engine is in low temperature mode, gas pedal rate of change is obtained, and it is big in gas pedal rate of change
When 0, sprayed after control diesel injector is dynamic, and gasoline ejector is sprayed after control and started, and when gas pedal rate of change is 0,
Whether engine is determined whether in starting state, and when engine is in starting state, after control diesel injector stops
Spray gasoline ejector is shut down after spray, and control, and spraying gasoline ejector after spray, and control after otherwise controlling diesel injector to start opens
It is dynamic.
In one embodiment of the invention, temperature control exhaust cooling before the whirlpool according to booster described in above-mentioned steps S3
The start and stop of device, further include：Whether temperature is higher than the first preset temperature before judging the whirlpool of booster, if the whirlpool of booster
Preceding temperature is higher than the first preset temperature, then control exhaust cooling device to start, and otherwise controls exhaust cooling device to shut down.At some
In example, for example, the first preset temperature is 800 DEG C.
The control method of dual fuel engine system according to embodiments of the present invention, sprays gasoline ejector and booster after increased,
And can be according to temperature before the whirlpool of engine water temperature, gas pedal rate of change and booster to rear spray gasoline ejector, diesel oil spray
The rear spray of oily device and the start and stop of exhaust cooling device are accordingly controlled, so that the working condition of more precise control booster, subtracts
Hysteresis phenomenon during small acceleration, improves the acceleration of dual fuel engine.In addition, taking full advantage of exhaust energy, reduce
Transient state oil consumption during acceleration, so as to reduce discharge.
It should be noted that the specific implementation of the control method of the dual fuel engine system of the embodiment of the present invention and the present invention
The specific implementation of the dual fuel engine system of embodiment is similar to, and specifically refers to the description of components of system as directed, superfluous in order to reduce
It is remaining, do not repeat.
Further, embodiment of the invention discloses that a kind of vehicle, the vehicle is provided with the double fuel hair described in above-described embodiment
Motivation system.The vehicle sprays gasoline ejector and booster after increased, and can be changed according to engine water temperature, gas pedal
Temperature is carried out to rear spray gasoline ejector, the rear spray of diesel injector and the start and stop of exhaust cooling device before the whirlpool of rate and booster
Corresponding control, so that the working condition of more precise control booster, reduces hysteresis phenomenon when accelerating, improves double fuel and starts
The acceleration of machine.In addition, taking full advantage of exhaust energy, transient state oil consumption during acceleration is reduced, so as to reduce discharge.
In addition, other of vehicle according to embodiments of the present invention constitute and effect for the ordinary skill in the art all
It is known, in order to reduce redundancy, does not repeat.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in spirit of the invention and former
Within then, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (10)
1. a kind of dual fuel engine system, it is characterised in that including：
Engine；
For the diesel injector of the vapour cylinder injection diesel oil to the engine；
Spray gasoline ejector is connected with combustion chamber, the exhaust combustion chamber is vented with the exhaust duct of the engine afterwards, the rear spray
Gasoline ejector is used for injected petrol in the exhaust combustion chamber；
Booster, the booster is connected with the exhaust combustion chamber；
Exhaust cooling device, the exhaust cooling device is located between the exhaust combustion chamber and the booster, with to from described
Exhaust combustion chamber is cooled down into the gas of the booster；And
Controller, the controller is used to obtain temperature before the whirlpool of engine water temperature, gas pedal rate of change and the booster,
And according to the start and stop and the diesel oil oil spout of the gentle gas pedal rate of change control of engine water spray gasoline ejector after described
The start and stop of the rear spray of device, and according to temperature control before the whirlpool of the booster exhaust cooling device start and stop.
2. dual fuel engine system according to claim 1, it is characterised in that the controller is used in the increasing
When temperature is higher than the first preset temperature before the whirlpool of depressor, the exhaust cooling device is controlled to start.
3. dual fuel engine system according to claim 1, it is characterised in that the controller starts according to
The start and stop of the rear spray of the start and stop and the diesel injector of spray gasoline ejector after machine water temperature and the control of gas pedal rate of change are described,
Specifically include：
The mode of operation of the engine is judged according to the engine water temperature, wherein, when the engine water temperature is pre- higher than second
If during temperature, judging that the engine is in normal temperature pattern, when the engine water temperature is less than the second preset temperature, institute is judged
State engine and be in low temperature mode；
If the engine is in normal temperature pattern, gas pedal rate of change is obtained, and be less than in the gas pedal rate of change
During the first default rate of change, the diesel injector is controlled to be sprayed after starting, and the oil spout phase sprayed after control is delayed, and described
When gas pedal rate of change presets rate of change more than first and presets rate of change less than second, after controlling the diesel injector to start
Spray, and when the gas pedal rate of change presets rate of change more than second and presets rate of change less than the 3rd, spray after control is described
Gasoline ejector starts, and when the gas pedal rate of change is more than the described 3rd default rate of change, controls the diesel oil spray
Oily device sprays after starting, and controls the rear spray gasoline ejector to start, wherein, the described first default rate of change is default less than second
Rate of change, the described second default rate of change is less than the 3rd default rate of change；And
If the engine is in low temperature mode, gas pedal rate of change is obtained, and be more than in the gas pedal rate of change
When 0, control the diesel injector to be sprayed after starting, and control the rear spray gasoline ejector to start, and in the gas pedal
When rate of change is 0, whether engine is determined whether in starting state, and when the engine is in starting state, control
Make after the diesel injector stops and spray, and control the rear spray gasoline ejector to stop, otherwise controlling the diesel injector to open
Sprayed after dynamic, and control the rear spray gasoline ejector to start.
4. dual fuel engine system according to claim 1, it is characterised in that also include：
Pressure stabilizing cavity, one end of the pressure stabilizing cavity is connected by pressure stabilizing cavity check valve with the exhaust cooling device, and the other end is by control
Valve processed is connected with engine aspirating system, and the pressure stabilizing cavity is used to store the vapor from the exhaust cooling device, and in institute
State when control valve is opened and import the vapor to the engine aspirating system, wherein, the pressure stabilizing cavity includes pressure stabilizing cavity pressure release
Valve.
5. dual fuel engine system according to claim 2, it is characterised in that first preset temperature is 800 DEG C.
6. dual fuel engine system according to claim 3, it is characterised in that second preset temperature is 80 DEG C.
7. a kind of control method of dual fuel engine system, it is characterised in that the dual fuel engine system is according to power
Profit requires the dual fuel engine system described in 1-6, and the control method is comprised the following steps：
Obtain temperature before the whirlpool of engine water temperature, gas pedal rate of change and the booster；
According to the start and stop and diesel oil spray of the gentle gas pedal rate of change control of engine water spray gasoline ejector after described
After oily device spray start and stop and
The start and stop of exhaust cooling device described in temperature control before whirlpool according to the booster.
8. the control method of dual fuel engine system according to claim 7, it is characterised in that described in the basis
The start and stop of exhaust cooling device described in temperature control, further include before the whirlpool of booster：
Whether temperature is higher than the first preset temperature before judging the whirlpool of the booster；
If temperature is higher than first preset temperature before the whirlpool of the booster, the exhaust cooling device is controlled to start, it is no
The exhaust cooling device is then controlled to shut down.
9. the control method of dual fuel engine system according to claim 7, it is characterised in that described in the basis
The gentle gas pedal rate of change of engine water controls the rear spray of the rear start and stop for spraying gasoline ejector and the diesel injector
Start and stop, further include：
The mode of operation of the engine is judged according to the engine water temperature, wherein, when the engine water temperature is pre- higher than second
If during temperature, judging that the engine is in normal temperature pattern, when the engine water temperature is less than the second preset temperature, institute is judged
State engine and be in low temperature mode；
If the engine is in normal temperature pattern, gas pedal rate of change is obtained, and be less than in the gas pedal rate of change
During the first default rate of change, the diesel injector is controlled to be sprayed after starting, and the oil spout phase sprayed after control is delayed, and described
When gas pedal rate of change presets rate of change more than first and presets rate of change less than second, after controlling the diesel injector to start
Spray, and when the gas pedal rate of change presets rate of change more than second and presets rate of change less than the 3rd, spray after control is described
Gasoline ejector starts, and when the gas pedal rate of change is more than the described 3rd default rate of change, controls the diesel oil spray
Oily device sprays after starting, and controls the rear spray gasoline ejector to start, wherein, the described first default rate of change is default less than second
Rate of change, the described second default rate of change is less than the 3rd default rate of change；And
If the engine is in low temperature mode, gas pedal rate of change is obtained, and be more than in the gas pedal rate of change
When 0, control the diesel injector to be sprayed after starting, and control the rear spray gasoline ejector to start, and in the gas pedal
When rate of change is 0, whether engine is determined whether in starting state, and when the engine is in starting state, control
Make after the diesel injector stops and spray, and control the rear spray gasoline ejector to shut down, otherwise control the diesel injector to open
Sprayed after dynamic, and control the rear spray gasoline ejector to start.
10. a kind of vehicle, it is characterised in that set just like the dual fuel engine system described in claim any one of 1-6.
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