CN109057976A - Starting method and methanol engine for methanol engine - Google Patents
Starting method and methanol engine for methanol engine Download PDFInfo
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- CN109057976A CN109057976A CN201810837152.5A CN201810837152A CN109057976A CN 109057976 A CN109057976 A CN 109057976A CN 201810837152 A CN201810837152 A CN 201810837152A CN 109057976 A CN109057976 A CN 109057976A
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- methanol engine
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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
- F02D19/0615—Switch-over from one fuel to another being initiated by automatic means, e.g. based on engine or vehicle operating conditions
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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
- F02D41/30—Controlling fuel injection
- F02D41/32—Controlling fuel injection of the low pressure type
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/021—Engine temperature
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
本发明提供了一种用于甲醇发动机的启动方法及甲醇发动机，涉及甲醇发动机领域。本发明采用的启动方法，在甲醇发动机启动前检测发动机的温度，如果甲醇发动机启动前的温度低于预设温度，则控制单元在接收到启动指令后，控制汽油冷启动喷油器直接向进气歧管上的歧管内喷射汽油，以实现甲醇发动机的冷启动。上述方法中，汽油冷启动喷油器直接将汽油喷射到进气歧管的歧管内与空气混合，而并不是直接将汽油喷射到进气歧管的进气稳压腔内与空气混合后再分配到歧管，这样可以有效控制汽油的喷射量，避免甲醇发动机在冷启动时因供油不足而引起的发动机冷启动失败的问题，且避免甲醇发动机在冷启动时因喷油过多而导致排放超标的问题。
The invention provides a starting method for a methanol engine and the methanol engine, and relates to the field of methanol engines. The starting method adopted in the present invention detects the temperature of the engine before starting the methanol engine. If the temperature before the starting of the methanol engine is lower than the preset temperature, the control unit controls the gasoline cold start injector directly to the Gasoline is injected into the manifold on the gas manifold for cold starting of methanol engines. In the above method, the gasoline cold-start injector directly injects gasoline into the manifold of the intake manifold to mix with air, instead of directly injecting gasoline into the intake pressure stabilizing chamber of the intake manifold to mix with air Distributed to the manifold, which can effectively control the injection amount of gasoline, avoid the problem of engine cold start failure caused by insufficient fuel supply during cold start of the methanol engine, and avoid the problem of excessive fuel injection during the cold start of the methanol engine The problem of excessive emissions.
Description
Technical field
The present invention relates to methanol engine fields, more particularly to a kind of starting method and methanol for methanol engine
Engine.
Background technique
With the aggravation of Pressure on Energy and pollution problem, the raising of car ownership, motor vehicle fuel is intended to diversification, and
Methanol belongs to clean energy resource, not only economy, low-carbon environment-friendly, also reduces CO2 emissions, methanol-fueled engine just by
Step is gradually in the marketization.
Methanol calorific value is about the half of bavin Water Oil Or Gas, and engine issues same function, the fuel needed be approximately diesel oil or
More than twice of gasoline, and equal quality methanol fuel vaporization caloric receptivity is more for the three times of gasoline, comprehensive both sides factor, first
Alcohol vaporization heat absorption is that the pact of the gasoline of equal quality is octuple, causes methanol engine at low ambient temperatures, methanol fuel be difficult to from
Enough heats are absorbed on the cold air on periphery and cold engine component, the vaporization for completing itself simultaneously can with air formation
Gaseous mixture process is fired, causes methanol engine cold start-up difficult.In the prior art, difficult in order to solve methanol engine cold start-up
The problem of, using dual fuel injection system.
And when huge discharge pure methanol engine cold start-up, when amount of gasoline is larger, engine causes in Cold Start
It discharges exceeded；When amount of gasoline is smaller, and it will cause engine cold-start failure.
Summary of the invention
It is an object of the present invention to provide a kind of starting method for methanol engine, using solve pure methanol as
Cold start-up problem brought by vehicle fuel.
Another purpose of the invention is to provide a kind of methanol engine, uses new fuel feed system, with solution
Certainly pure methanol is as cold start-up problem brought by vehicle fuel.
On the one hand, the present invention provides a kind of starting methods for methanol engine, comprising:
Temperature before obtaining the methanol engine starting；
Temperature before methanol engine starting is compared with preset temperature and exports comparison result；
In response to the enabled instruction of the methanol engine, and the temperature before methanol engine starting is lower than described
Gasoline cold start fuel injector device injected petrol directly into the manifold of inlet manifold is controlled when preset temperature, to realize the methanol hair
The cold start-up of motivation.
Optionally, after methanol engine cold start-up, when the temperature of the methanol engine is more than or equal to described pre-
If when temperature, controlling the gasoline cold start fuel injector device and stopping oil spout, and control the methanol fuel injector directly to the manifold
Interior injection methanol.
Optionally, the preset temperature is 20 DEG C.
On the other hand, the present invention also provides a kind of methanol engines, comprising:
Temperature detecting unit, the temperature for methanol engine described in real-time detection；
Temperature comparing unit, the temperature before methanol engine starting for detecting the temperature detecting unit
It is compared with preset temperature and exports comparison result；
Control unit, in response to the enabled instruction of the methanol engine, and the temperature before methanol engine starting
Gasoline cold start fuel injector device injected petrol directly into the manifold of inlet manifold is controlled when degree is lower than the preset temperature, to realize
The cold start-up of the methanol engine.
Optionally, described control unit is configured to after the methanol engine is cold-started, and described control unit is in institute
When stating the temperature of methanol engine more than or equal to the preset temperature, controls the gasoline cold start fuel injector device and stop oil spout, and
It controls the methanol fuel injector and directly sprays methanol into the manifold.
It optionally, further include the gas handling system, fuel feed system and crankcase ventilation system with the inlet manifold,
The inlet manifold includes air inlet pressure stabilizing cavity and multiple manifolds for being connected to the air inlet pressure stabilizing cavity, two between the multiple manifold
Two is mutually indepedent.
Optionally, the fuel feed system includes an injector assembly, wherein the injector assembly includes one
Methanol oil spout component and one for spraying methanol directly into the multiple manifold are used for directly into the multiple manifold
The gasoline oil spout component of injected petrol, the methanol oil spout component and the gasoline oil spout component are mutually indepedent.
Optionally, the methanol oil spout component include methanol oil rail and be set on the methanol oil rail and with it is the multiple
Multiple methanol fuel injectors, the methanol fuel injector are used to spray methanol into the manifold manifold correspondingly；
The gasoline oil spout component include gasoline oil rail and be set on the gasoline oil rail with the multiple manifold one
One corresponding multiple gasoline cold start fuel injector devices, the gasoline cold start fuel injector device are used for the injected petrol into the manifold.
Optionally, the gasoline cold start fuel injector device be configured to by fuel injector spout along the manifold axial direction to
Injected petrol in the manifold；
The methanol fuel injector is configured to spray along the axial direction of the manifold into the manifold by fuel injector spout
Penetrate methanol.
Optionally, the gas handling system includes exhaust gas recirculation mixer (EGR mixer) and electronic throttle, described
EGR mixer includes a gas outlet and two air inlets, wherein the air inlet phase of the gas outlet and the air inlet pressure stabilizing cavity
Connection, an air inlet are connected with the electronic throttle, another air inlet is connected to exhaust gas recirculation circuit；
The crankcase ventilation system is closed crankcase ventilation system；The closed crankcase ventilation system includes air inlet
Pipe, gs-oil separator, escape pipe and oil return pipe；Wherein, the escape pipe branches into the first escape pipe and the second escape pipe, described
After first escape pipe is connected to air cleaner, second escape pipe is connected with the air inlet stable cavity, second outlet
Check valve is in series on pipe.
Starting method for methanol engine of the invention, the temperature of detection engine before methanol engine starts,
If the temperature before methanol engine starting is lower than preset temperature, control unit controls gasoline after receiving enabled instruction
Cold start fuel injector device injected petrol in the manifold directly in inlet manifold, to realize the cold start-up of methanol engine.Above-mentioned side
In method, gasoline is directly ejected into the manifold of inlet manifold by gasoline cold start fuel injector device to be mixed with air, and is not direct
Gasoline is ejected into after being mixed with air in the air inlet pressure stabilizing cavity of inlet manifold and is redistributed to manifold, can effectively control vapour in this way
The amount of injection of oil avoids the problem that methanol engine engine cold-start because caused by for shortage of oil in cold start-up fails,
And methanol engine is avoided to cause to discharge exceeded problem because oil spout is excessive in cold start-up.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter.
Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.In attached drawing:
Fig. 1 is the schematic flow chart of starting method according to an embodiment of the invention；
Fig. 2 is the schematic installation diagram of methanol engine according to an embodiment of the invention；
Fig. 3 is the schematic apparatus figure of the injector assembly in methanol engine shown in Fig. 2；
Fig. 4 is schematic apparatus figure when injector assembly shown in Fig. 3 is installed to methanol engine；
Fig. 5 is the schematic apparatus that injector assembly in accordance with another embodiment of the present invention is installed to methanol engine
Figure；
Fig. 6 is the schematic apparatus figure of the gas handling system in methanol engine shown in Fig. 2；
Fig. 7 is schematic apparatus figure of the gas handling system under another angle in methanol engine shown in Fig. 2；
Fig. 8 is the schematic apparatus figure of the closed crankcase ventilation system in methanol engine shown in Fig. 2.
Specific embodiment
Fig. 1 is the schematic flow chart of starting method according to an embodiment of the invention.Fig. 2 is one according to the present invention
The schematic installation diagram of the heavy methanol engine of embodiment.Fig. 3 is showing for the injector assembly in methanol engine shown in Fig. 2
Meaning property device figure.Fig. 4 is schematic apparatus figure when injector assembly shown in Fig. 3 is installed to methanol engine.Fig. 5 is according to this
The injector assembly for inventing another embodiment is installed to the schematic apparatus figure of methanol engine.Fig. 6 is the hair of methanol shown in Fig. 2
The schematic apparatus figure of gas handling system in motivation.Fig. 7 is gas handling system in methanol engine shown in Fig. 2 under another angle
Schematic apparatus figure.Fig. 8 is the schematic apparatus figure of the closed crankcase ventilation system in methanol engine shown in Fig. 2.Under
Face describes the methanol engine of the embodiment of the present invention referring to Fig. 2 to Fig. 8, in the description of the embodiment of the present invention, indicates in figure
Orientation or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplification is retouched
It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation,
Therefore it is not considered as limiting the invention.
With reference to Fig. 1, a kind of starting method for methanol engine, comprising:
Step 1, the temperature before obtaining methanol engine starting；
Step 2, the temperature before methanol engine is started are compared with preset temperature and export comparison result；
Step 3, in response to the enabled instruction of methanol engine, and the temperature before methanol engine starting is lower than default
Gasoline cold start fuel injector device injected petrol directly into the manifold of inlet manifold is controlled when temperature, to realize the cold of methanol engine
Starting.
In the above method, gasoline is directly ejected into the manifold of inlet manifold by gasoline cold start fuel injector device to be mixed with air
Close, and be not directly gasoline is ejected into mixed with air in the air inlet pressure stabilizing cavity of inlet manifold after be redistributed to manifold, this
Sample can effectively control the amount of injection of gasoline, avoid methanol engine engine because caused by for shortage of oil in cold start-up cold
The problem of starting failure, and methanol engine is avoided to cause to discharge exceeded problem because oil spout is excessive in cold start-up.
It continues to refer to figure 1, specifically, before vehicle launch, after vehicle is powered (i.e. car key is on grades), starts to obtain
Temperature before taking methanol engine to start, the temperature before then starting methanol engine are compared with preset temperature.It is default
The temperature that temperature sets for staff, specially 20 DEG C.If the temperature before methanol engine starting is less than preset temperature,
Illustrate there are problems that methanol fuel difficulty in starting (engine cold-start), engine key turn round to starting shelves when,
It is car owner's sending enabled instruction, at this point, control gasoline cold start fuel injector device injected petrol directly into the manifold of inlet manifold,
To realize that methanol engine is cold-started.If the temperature before methanol engine starting is more than or equal to preset temperature, explanation is not present
The problem of methanol fuel difficulty in starting (engine cold-start), controls methanol fuel injector directly to discrimination after receiving enabled instruction
Methanol is sprayed in pipe.
Further, after engine cold-start, continue the temperature of real-time monitoring methanol engine.It was run in engine
Cheng Zhong continues the injected petrol into manifold if the temperature of methanol engine is still less than preset temperature, until methanol starts
The temperature of machine is more than or equal to preset temperature.After the temperature of methanol engine is more than or equal to preset temperature, it is cold that gasoline is controlled at this time
Start fuel injector and stop oil spout, and control methanol fuel injector and directly spray methanol into manifold, realizes M100 fuel supply, drop
Low exhaust gas exhaust emission.
According to above-mentioned starting method, the present invention also provides a kind of methanol engines comprising temperature detecting unit, temperature
Comparing unit and control unit.Temperature detecting unit is used for the temperature of real-time detection methanol engine.Specifically, temperature detection list
Member can be engine water temperature sensor, be installed on it is cold go in system, for detecting engine water temperature, engine water temperature refers generally to
Be engine coolant exit coolant liquid temperature.Temperature comparing unit is used for the first for detecting temperature detecting unit
Temperature before alcohol engine start is compared with preset temperature and exports comparison result.Specifically, temperature comparing unit can be with
For an individual device or system, can also be integrated into vehicle ECU.Control unit refers in response to the starting of methanol engine
It enables, and controls gasoline cold start fuel injector device directly to inlet manifold when the temperature before methanol engine starts is lower than preset temperature
Manifold in injected petrol, to realize the cold start-up of methanol engine.Specifically, control unit can be an individual device
Or system, it can also be integrated into vehicle ECU.
In a preferred embodiment, temperature comparing unit and control unit are integrated into vehicle ECU, engine water temperature
Sensor is connected with vehicle ECU.When water temperature before engine start is lower than preset temperature, ECU controls gasoline cold start fuel injector
Device injected petrol directly into the manifold of inlet manifold.
With reference to Fig. 2, methanol engine 100 can be light-duty methanol engine, can also be heavy methanol engine.Methanol
Engine 100 is using the pure methanol of M100 as fuel comprising engine body 1, gas handling system 2 and fuel feed system 3.Into
One step refers to Fig. 5, and engine body 1 can be natural gas engine ontology, and multiple cylinders 11 are arranged inside.Gas handling system 2
For providing air into cylinder 11.Inlet manifold 20 in gas handling system 2 include air inlet pressure stabilizing cavity 21 and with air inlet pressure stabilizing cavity
21 connected and mutually independent multiple manifolds 22.The quantity of manifold 22 is identical as the quantity of cylinder 11 and the two corresponds, discrimination
Pipe 22 runs through engine cylinder cover 12, to spray air into cylinder 11.Fuel feed system 3 is used to provide to engine body 1
Fuel, fuel feed system 3 include the injector assembly 30 of at least one alone jetting fuel directly into each manifold 22, combustion
Material enters cylinder 11 with air after spraying into manifold 22 after evenly mixing.The size and specific structure of injector assembly 30 can be according to first
The model and size of alcohol engine 100 is determined.
Methanol engine 100 in the embodiment of the present invention is the spark-ignition engine using pure methanol as fuel, due to
Methanol relative to other fuel source, power, cost and in terms of have relative advantage, the cleaning of fuel may be implemented
Burning reduces Engine Emissions object discharge amount, is more advantageous to the popularization and application in market.Further, injector assembly 30
The alone jetting fuel directly into each manifold 22 makes to mix to ensure that air in each cylinder 11 and fuel are uniformly mixed
Gas is maintained at chemically correct fuel range and nearby burns, and improves efficiency of combustion.
With reference to Fig. 3, in one embodiment, injection has been separately configured using double oily rails, each oil rail in injector assembly 30
The injector of the fuel, charge oil pressure 4.5bar.Injector assembly 30 is additionally provided with oil return system.Specifically, each oil spout
Device assembly 30 include one for directly into manifold 22 spray methanol methanol oil spout component 31 and one for directly to
The gasoline oil spout component 32 of injected petrol in manifold 22, methanol oil spout component 31 and gasoline oil spout component 32 are mutually indepedent.Methanol
Oil spout component 31 includes methanol oil rail 311 and is set on methanol oil rail 311 and identical as 22 quantity of manifold in inlet manifold 20
Methanol fuel injector 312, methanol fuel injector 312 and manifold 22 correspond, for spraying methanol into manifold 22.Gasoline oil spout
Component 32 includes gasoline oil rail 321 and is set on gasoline oil rail 321 and gasoline cold start fuel injector identical with 22 quantity of manifold
Device 322, gasoline cold start fuel injector device 322 and manifold 22 correspond, for the injected petrol into manifold 22.Methanol fuel injector and
Gasoline cold start fuel injector device operating voltage is 24V.
Using above-mentioned injector assembly 30, due to being equipped with gasoline cold start fuel injector device at the manifold 22 of each cylinder 11
322, so that the amount of gasoline sprayed in each cylinder 11 is not only can guarantee engine cold-start, but also it is possible to prevente effectively from order to guarantee to start
Machine is cold-started successfully, and big petrol is sprayed into inlet manifold 20 and causes discharge not up to standard.
Further, it is be easy to cause wet wall since the oily beam that fuel injector spout sprays is ejected on tracheae wall surface, influences vapour
Oil and gasization and cold start-up engine emission, therefore, in a preferred embodiment, gasoline cold start fuel injector device 322 is configured to
By fuel injector spout along the axial direction injected petrol of manifold 22, meanwhile, methanol fuel injector 312 is configured to spray by fuel injector
The axial direction of opening's edge manifold 22 sprays methanol into manifold 22.With reference to Fig. 4, the cylinder cap 12 of engine is vertically arranged, manifold 22
End outlet it is vertical with cylinder cap 12, therefore, when the oil spout direction of fuel injector is arranged, preferably the spout of fuel injector is sprayed
Fuel out is also perpendicularly to cylinder cap 12, and fuel is directly entered cylinder 11 after mixing with air, and avoids being sprayed on tube wall.It that is to say,
Fuel injector is configured to spray methanol along the axial direction of manifold 22 by fuel injector spout.
Further, fuel feed system 3 be configured to according to the temperature of engine coolant through methanol fuel injector 312 or
Gasoline cold start fuel injector device 322 alternatively sprays fuel into manifold 22.Specifically, injector assembly 30 is configured to work as and start
The temperature of machine coolant liquid passes through the injected petrol into inlet manifold 20 of gasoline cold start fuel injector device 322 when being lower than preset temperature.In advance
If temperature is 20 DEG C.
When methanol engine is cold-started, gasoline cold-start injector on manifold 22 controllably to 22 injected petrol of manifold,
Gasoline vaporising simultaneously forms combustion mixture with air, and into cylinder 11,13 ignition of spark plug, engine start is operated, to
After warming-up, it is switched to 312 oil spout of methanol fuel injector, gasoline cold-start injector stops oil spout, normal working of engine.In this way,
Fuel supply can use a set of control system, integrates the switching undisturbed of flexibly control two kinds of fuel of methanol and gasoline, realizes
The multipoint sequential injection of methanol, system structure is simple, low in cost, while also solving pure methanol and being brought as vehicle fuel
Cold-starting problem.
With continued reference to Fig. 3, it is unfavorable for quality control and production management in order to avoid the increase of machine part quantity, fuel injector
Assembly 30 further includes the oily rail bracket 33 of fixing fuel injector assembly 30, wherein methanol oil rail 311 and gasoline oil rail 321 pass through group
Bracket is closed to be fixed together or be affixed directly to together.In the embodiment shown in fig. 3, consider the convenience of mounting arrangements,
Methanol oil rail 311 and gasoline oil rail 321 are welded together, injector assembly 30 is fixed to hair by two oily rail brackets 33
In motivation.Before injector assembly 30 is installed to engine, first components in injector assembly 30 are assemblied together, it can
To avoid bad student's error during installation, engine is impacted.Specifically, methanol oil rail 311 and gasoline oil rail 321 are two
Mutually independent oil rail, squarely can be set in oily rail section.The shapes such as round or ellipse.Oily rail is equipped with for installing spray
Fuel injector is fixed on oily rail by the fuel injector mounting base of oily device.Be additionally provided with fuel inlet fitting on oily rail, by fuel inlet fitting with
Fuel tank is connected.
With reference to Fig. 5, region shown in dotted line is an injector assembly 30 shown in Fig. 4 in figure, in the implementation
In example, installation is there are two injector assembly 30 on a kind of heavy type methanol engine 100, due to the body of heavy methanol engine 100
Product is bigger, and using an injector assembly 30, oily rail is long, will affect installation accuracy, in addition, engine is in operational process
Middle generation vibration, is easy to impact long oil rail.In other embodiments, multiple injector assemblies can also be set, specifically
Quantity can be depending on engine model.
As shown in figure 5, a set of Methanol-gasoline oil rail injector assembly contains, 3 methanol fuel injector 312 and 3 gasoline are cold to be opened
Dynamic fuel injector 322, every heavy methanol engine 100 use two sets of 321 injector assemblies 30 of Methanol-gasoline oil rail.Cold start-up
When operating condition, gasoline pump work, methanol air pump inoperative, 6 gasoline cold start fuel injector devices 322 are directly to the manifold being connected with cylinder 11
Injected petrol in 22, gasoline mix well with air after being ejected into manifold 22, into cylinder 11 after lighted by spark plug 13；Work as temperature
After degree reaches preset threshold, engine is under nominal situation, methanol pump work, gasoline air pump inoperative, 6 methanol fuel injectors
312 spray methanol into manifold 22.In this embodiment, ECU need at most control 6 fuel injectors under any operating condition.Using the fuel
Feed system 3, mechanism is simple, and control logic is also succinct, at low cost.
It further include exhaust gas recirculation mixer (EGR mixer) and electronic throttle with reference to Fig. 6 and Fig. 7 gas handling system 2,
EGR mixer includes a gas outlet and two air inlets, wherein and gas outlet is connected with the air inlet of air inlet pressure stabilizing cavity 21,
One air inlet is connected with electronic throttle, another air inlet is connected to exhaust gas recirculation circuit.Further, each manifold
It is opened up on 22 there are two atomizer mounting hole, is respectively intended to installation methanol nozzle and gasoline cold start nozzle.Gas handling system 2 can
Realize that each cylinder is equal by optimization intake airflow dynamics model to improve each cylinder intake uniformity of inlet manifold 20 so that each cylinder air-fuel ratio is balanced
Even burning, to promote engine economy, dynamic property and discharge.Oil spout is arranged on each manifold 22 of inlet manifold 20
Device mounting hole is to realize the multipoint sequential injection of fuel.
With continued reference to Fig. 2, methanol engine 100 further includes for handling the gas blowby in crankcase with the pressure of balance crankshaft case
The crankcase ventilation system 4 of power.Open crank case ventilating system 4 or closed crankcase ventilation system 4 can be used in engine.
With reference to Fig. 8, in the present embodiment, in order to further make discharge meet laws and regulations requirement, methanol engine uses enclosed
Crankcase ventilation system.It is matched by closed crankcase ventilation system with fuel feed system 3, crankcase emissions can be made
It comes back to engine body 1 and participates in burning, reduce pollutant discharge amount.Closed crankcase ventilation system 4 include air inlet pipe 41,
Gs-oil separator 42, escape pipe 43 and oil return pipe 44；Wherein, escape pipe 43 branches into the first escape pipe 431 and the second escape pipe
432, after the first escape pipe 431 is connected to air cleaner, the second escape pipe 432 is connected with air inlet stable cavity, the second escape pipe
Check valve 45 is in series on 432.
Closed crankcase ventilation system working principle is as follows: engine is in idling and underload, 20 vacuum of inlet manifold
Degree is big, and crankcase gas blowby enters inlet manifold 20 through gs-oil separator 42 and Pcv valve；At this time since crankcase gas leakage is few, and
And can be effectively discharged by Pcv valve, crankcase pressure can be lower than air inlet tube internal pressure after air filter, has portion gas and passes through sky
Filter side ventilation duct enters in crankcase, with balance crankshaft case pressure.Engine in big-and-middle load, due to throttle opening compared with
Greatly, and booster calm the anger after pressure it is higher, pressure rise is positive pressure in inlet manifold 20, and Pcv valve is closed, crankcase gas blowby at this time
It is discharged by air filter side ventilation duct, prevents crankcase pressure excessively high.Check valve 45 is configured to be greater than in the pressure of air inlet stable cavity
It closes when the pressure of crankcase, is opened when the pressure of air inlet stable cavity is less than the pressure of crankcase.
Methanol engine 100 in above-described embodiment may be implemented to discharge, methanol supply, igniting, theoretical air-fuel
Than the control of, pinking, EGR, Valve EGR, engine cold-start, EOBD diagnosis etc., it is right to meet heavy methanol engine 100
The functional requirement of electric-control system.
So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein multiple shows
Example property embodiment still without departing from the spirit and scope of the present invention, still can according to the present disclosure directly
Determine or deduce out many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers all such other variations or modifications.
Claims (10)
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| CN201810837152.5A CN109057976A (en) | 2018-07-26 | 2018-07-26 | Starting method and methanol engine for methanol engine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566352A (en) * | 2019-08-28 | 2019-12-13 | 浙江吉利新能源商用车集团有限公司 | Hybrid vehicle oil supply system and vehicle |
| CN114233494A (en) * | 2021-09-29 | 2022-03-25 | 太原理工大学 | A kind of methanol engine cold start device and method |
| CN114483407A (en) * | 2022-01-25 | 2022-05-13 | 浙江吉利控股集团有限公司 | Engine start control method, vehicle, and computer-readable storage medium |
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| CN115929482A (en) * | 2022-12-20 | 2023-04-07 | 浙江吉利控股集团有限公司 | Engine mode switching method, terminal equipment and computer storage medium |
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