CN106536889A - Combustion method - Google Patents
Combustion method Download PDFInfo
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- CN106536889A CN106536889A CN201580039045.2A CN201580039045A CN106536889A CN 106536889 A CN106536889 A CN 106536889A CN 201580039045 A CN201580039045 A CN 201580039045A CN 106536889 A CN106536889 A CN 106536889A
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- Prior art keywords
- piston
- explosive motor
- depression
- compression ignition
- ignition type
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Classifications
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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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
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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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/066—Details related to the fuel injector or the fuel spray the injector being located substantially off-set from the cylinder centre axis
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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)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention relates to a self-igniting internal combustion engine comprising at least one cylinder, a piston which reciprocates in the cylinder, defines a combustion chamber along with the cylinder, and includes a combustion bowl facing the combustion chamber, and an injector located above the combustion bowl for injecting fuel into the combustion bowl.
Description
The present invention relates to a kind of compression ignition type explosive motor with the piston being recessed with piston, and with specifically exist
The selected injection device of nozzle eject position is related to a kind of fuel/air mixture for forming uniformity improvement combinedly to be mixed
The method of compound.
DE 197 07 873 (A1) disclose it is a kind of for explosive motor, the injection device of specifically Diesel engine,
The electromotor in each case with a combustor formed by piston, cylinder and cylinder cover, and injection nozzle and
Involucrum, the involucrum are stretched in the combustor and around the nozzle from the cylinder cover, and its mode is to be in this in top dead centre (TDC)
Precombustion chamber is configured between involucrum and the piston, pre-burning occurs in the precombustion chamber.
27 29 050 A1 of DE have been disclosed for reciprocating piston explosive motor, specifically Diesel engine
Cylinder cover, the cylinder cover has the Inlet and outlet pipe for gaseous medium that provides thereon, and the gaseous medium needs to be drawn
In entering the combustor of the explosive motor and need to be discharged from again, these Inlet and outlet pipes are equipped with and are opened to correspondence
Multiple valves of multiple openings and the closing opening in combustor, and the bar of the valve is in the region of the pipeline
In guiding piece in axially guide, and each combustor be assigned be arranged in it is on cylinder cover, for equally having to be introduced
At least one injection nozzle of the fuel in the combustor, and the cylinder cover itself be used for cylinder that closing opened towards which and
Define the combustor, it is characterised in that the cylinder cover both no cooling fin and no water core pipe and had been equipped with least one
Bar is used for the pipeline of coolant, and the pipeline is guided on the cylinder cover and added in the burned gas heat of at least one height
On the part of load.
1 045 136 A1 of EP disclose a kind of method for operating reciprocating piston explosive motor, wherein court
The injection nozzle that working place opens is directly injected into fuel in the working place, and the working place is formed in vapour in the cylinder
Between cylinder cap and piston and including piston be recessed, in relatively low fractional load scope, fuel will reach top dead centre it
It is front by relative to piston crown into the straight angle in central authorities' injection piston depression for forming mixture heterogeneous, with
In fractional load scope afterwards, fuel at least in part by with relative to the sharper angle of piston crown inject in a region with
Just form uniform mixture to be formed, and in full load scope, the fuel of a part is in the crankshaft angles from 180 ° to 20 °
In scope before top dead center by with relative to piston crown it is sharper angle injection to form uniform mixture to be initially used for,
And remaining fuel around the top dead centre in the range of by with the angle injection piston depression more flat relative to piston crown
For formation, mixture heterogeneous.
2 003 303 B1 of EP disclose a kind of work of the piston depression with piston crown and offer in piston crown
Plug, is specifically used for the explosive motor of two kinds of possible different operation modes operations, and the piston is in the explosive motor
Can be along piston longitudinal axis translational movement in operating process, and wherein the piston depression has for configuring Omega shape
The concave regions of base shape, sunk surface towards piston longitudinal axis that the Omega shape piston is recessed have substantially
The subregion of cylinder, the subregion are to orient along piston longitudinal axis and import in piston crown and formed convex
Shape concave edges.Additionally, the present invention relates to it is a kind of using such piston come the method for forming fuel/air mixture.
Cause to be possibly realized the control of the improvement of controlled compression igniting and cause there is provided the piston piston of type mentioned above
The load of higher rotating speed and Geng Gao can be obtained using LTC methods.This is by the above-mentioned type, in the substantially cylinder
In the subregion of shape, the piston with height T2 is realized, wherein T2 is equal to 0.025d, and the convex concave edges have
Radius of curvature R 2, wherein R2 are equal to 0.006d, and d describes piston diameter.
The shortcoming of conventional diesel engines method is first, due to the fuel/air mixture of direct injection diesel engine
Soot emissions caused by inhomogeneities.Due to the inhomogeneities of fuel/air mixture, formed in local stenosis limited range
Mixture is formed, and its degree causes compression ignition condition to be partly dominant, and the mixture in other other scopes still
It is so very uneven.Correspondingly, compression ignition with for cause the further homogenization of mixture for it is favourable compared with by
Start earlier.Here, specifically with sub-stoichiometric ratio local air ratio (lambda (lambda)<1) mixing
Soot is defined in the range of thing.
The height for being caused temperature high and being caused by the process be further disadvantage is that in conventional direct injection diesel engine method
Discharged nitrous oxides.
Reduce discharged nitrous oxides a kind of probability be to use exhaust after treatment system, for example SCR catalytic converter or
Exhaust gas recirculatioon (EGR), can reduce ignition temperature, specifically spike process temperature by means of which.The formation of nitrogen oxides is also
Reduce with the reduction of ignition temperature.
The shortcoming of the probability is cost and packaging or is internally electromotor in the case of EGR in unstable shape
The transient response of the operating difference of state.
In this context, it is an object of the invention to provide a kind of be used for being formed fuel/air mixture without such as conventional
The method of the shortcoming described in method..
The realization of the purpose is by a kind of piston with piston depression and by a kind of corresponding for operating
The method of explosive motor, which has at least one cylinder and a piston that can move back and forth in the cylinder, the piston with should
Cylinder defines combustor and is recessed with the piston towards the combustor, and with infusion appliance, the infusion appliance is arranged at this
Piston is recessed top to inject fuel in piston depression.Other favourable improvement is shown in subclaims.Should
The piston that electromotor has is recessed with Omega shape.The depression is flat and with broad design and has
Obvious conical inner body.The piston depression is for low-down pollutant emission in partial load run and is directed to full load
Optimum air using being optimized.
The diesel engine operation method is the compression ignition based on the fuel to introducing combustor.Here, fuel injection
It is to be directly entered occur in main chamber or being come into precombustion chamber or whirlpool as indirectly injection as being directly injected into
Occur in vortex cavity room.Fuel vaporization carries out mixing with the cylinder content of the heat of compression, and by automatic ignition.It is this
Internal mix thing is formed.The principal character characteristic of Diesel engine is quality
Adjust, that is to say, that it is changing air ratio in predefined air quality by by the fuel mass for injecting that load is arranged
Rate is carrying out.
As the fuel in the region of top dead centre injects and can be used for only several milliseconds that introduce fuel of short time period, note
Enter system and injection parameter has been assigned decisive meaning.
Operation that mixture is formed and the common diesel combustion method that partly simultaneously carries out after fuel injection can be with
It is broken down into these partial routines indicated in context below：Atomization, evaporation+mixing, pre-reaction, igniting, burning+pollutant
Formed.
Firing delay is defined as injecting the time started and between compression ignition.Here, jet is propagated, is atomized and evaporated
It is referred to as physics firing delay, and the chemical reaction started when evaporation starts is referred to as chemic ignition delay.
Due to high injection pressure, injection jet at full speed leaves nozzle and as fuel is relative to cylinder content
The air force educational level that produces of relative velocity and be fragmented into a large amount of different size of droplets.The quality of fuel atomization depends on combustion
The speed of material, density and surface tension, depending on the level of injection pressure, depending on nozzle geometry and depending on combustion
Burn density and the moving condition of room air.Fuel atomization is promoted by the turbulent flow present in injection jet.Between droplet
Interaction causes collision process, it is possible thereby to produce the fragmentation or combination of droplet.To most significantly braking for fuel droplets it is
Produce in jet tip and jet marginal area.The fuel hard shower tip being subsequently injected into, which results in which mushroom
Form and suitable obvious structure in causing jet.In this operating process, the interaction of the turbulent flow of fuel droplets is conducive to
Mixture is formed.
The geometry of combustor contribute to substantial part similarly for the optimization of the combustion method.Injected system and
The mutual adaptation of combustion-chamber geometry is for having special importance using maximum capacity.Combustor has a ginseng to be optimized
The combination of the number shape that above all piston is recessed and air swirl, air swirl is by inlet duct and flat
Space, igniting boss and cylinder cover in closed volume minimum and produce.
Cylinder, entering to become a mandarin and be referred to as eddy-currents around cylinder axis rotation is flowed into, which is formed depending on entrance zone, threshold zone
Geometry.Accounting for leading content movement in top dead centre region in a combustion chamber is produced by during the charging stage
Swirl flow caused by, this content movement for ensuing mixture formed and burn have conclusive impact.
Measurement to the cylinder cover flow of test vehicle is carried out on static flow table.
The substantial effect to engine characteristicses under fractional load and full load has been made in the way of fixing compression ratio.
In addition to Actual combustion room, the cylinder cover is also to burning with substantial effect.In the diesel engine of most of passenger vehicles
In machine, the Four-valve technologies of every cylinder two entrances valve and two outlet valves have been established for itself status, while these
Valve is activated typically by two camshafts.Compared with two valve concepts, generate just bigger opening section and because
Advantage in terms of the cylinder filling that this improves and the whirlpool that can be configured in a variable manner.Here, the two inlet ducts
One of be designed to have the fill pipe that high throughflow and low whirlpool are formed, and second inlet duct is designed to realize
The whirlpool pipeline of air rotational movement and the throughflow for reducing is produced more obviously.It is this design make it possible to by (due to
It is all running under any circumstance with big air excess that the quality adjusts Diesel engine) low-load point cuts off the filling
Pipeline is realizing whirlpool control.As a result be to improve air side mixture to be formed, and effect is formed to soot and reduced, and therefore change
The compatibility of kind exhaust gas recirculatioon.
Here, it is important that make injected system be formed with whirlpool and be adapted to avoid the fuel among floating to each other from penetrating
Stream.Additionally, the air system of the Diesel engine has on burning affecting.Here, the design of exhaust turbine supercharger is presented
In startup or from the dynamic response characteristic during the acceleration of low engine speed and (due to the rated output point unit vortex in electromotor
Turbine reaches surge limit and in the cards) it is compromise between maximum pressure boost.Introduce variable turbine geometry here
Bring substantial progress.In the future, two benches are pressurized concept or supercharging will provide further potential successively, in this situation
Under little high pressure turbocharger ensure that gratifying by improving boost pressure under low engine speed and load
Dynamic response characteristic, and big low pressure turbocharger causes much higher boost pressure in the range of the fair speed of electromotor
It is possibly realized.In the case where entrance valve is opened late, to descending when induction stroke of the piston in entrance valve-closing starts
Walk, and expand the residual gas in cylinder, therefore produce vacuum in a combustion chamber.When entrance valve is opened, air inlet
Air is flowed in cylinder with high flow velocities in the pressure reduction being because between inlet manifold and combustor.By the strategy, can
To increase the movement of entire content thing, but be to increase the swirl flow in combustor first, this facilitate air side mixture and formed.
Depending on the operating point and api request of electromotor, the strategy considerably can improve air side mixture formed and because
This has positive influences to emission performance.In entrance side, the pipeline for producing content movement may be configured to eddy duct
Road, and another pipeline is used for optimizing cylinder and filling and be implemented as tangential pipeline.
Due to the high temperature in combustor, what fuel droplets occurred after fuel atomization immediately is readily volatilized group first
Into part evaporation and be afterwards half volatile component evaporation.Diffusion and convection current cause the mixing of fuel and air,
Very uneven mixture is formed in the case of this, is suitable sub-stoichiometric ratio near the region of nozzle and its jet core
And with a high proportion of fuel still for liquid.With the distance increase away from nozzle and jet axis and as injection starts
Past of time afterwards, mixture become more and more thinner and increasingly into gaseous state.Due to the layering, in the outside of jet
All the time there is the region of the admixture for being conducive to compression ignition in region.
In addition to the physical process prepared by mixture, the chemical reaction for depending greatly on pressure and temperature also leads to
Cross the generation of heat and the formation of group (radical) and ultimately result in the position with the prerequisite most beneficial for this purpose
Put place and produce compression ignition.Heterogeneous mixture in the combustor of the Diesel engine has all the time with favourable fired state
Region.Here, first time combustion ignition preferably occur in the air ratio having between I=0.6 and I=0.8 compared with
In the region of enriched Mixture.Leading overall area ratio is accounted in a combustion chamber hardly has impact to firing delay.More next
In the case of the mixture being more enriched with, there is slower reaction, this is mainly due to the heat absorption evaporation in larger fuel mass
During more obviously mixture cooling.In addition to pressure, temperature and injection rate, the Cetane number of fuel, injection pressure, spray
Nozzle aperture diameter, the boiling range of fuel and combustor flow are conclusive for firing delay.
Another important parameter for affecting chemical pre-reaction is exhaust gas recirculatioon.The time of conventional diesel engines burning is bent
Line is broken down into multiple stages.
First, with quick flame propagation be pre-mixed formula burning, and with satisfactorily preparing and anti-
(first stage) is lighted a fire in the region of the fuel/air mixture of local uniform by the mixture of answering property.This is pre-mixed formula combustion
The quick flame propagation burnt produces steep barometric gradient.
The characteristic of the combustion phases is the obvious spike in combustion process.Fire in the diffusion of ensuing mixture-controlled
In burning, there is the conversion (second stage) of further fuel quantity.The region of these reaction partners not exclusively mixing is due to mixed
Conjunction process and burn in a controlled manner, this be by so that fuel and air with diffusion-controlled by way of flow in flame and realize
's.Here, fuel is mixed with air and the burning gases with varied composition.What is occurred during the burning is mixed
Compound forms operation for the combustion process has decisive influence.The gas temperature that is gradually lowered and reaction partner it is low dense
Degree causes the burning of residual fuel amount, and this is carried out in lentissimo mode in stage (phase III) after combustion.
In the case of diesel engine combusts, hydrocarbon emission (HC) and the oxygen as imperfect combustion product
It is low-down compared with petrol engine to change carbon emission (CO).Reduction nitrogen oxides are demonstrated in the case of diesel engines
It is much more difficult with granule.By contrast, in the case of the uniform burning of the uniform of diesel fuel or part, partly send out
Life much higher HC and CO discharges.
Hydrocarbon fraction in diesel engine exhaust is imperfect combustion product.The reason for imperfect combustion, can be with
In combustor, flame is not reached, under low temperature, do not react in time or only partially react it is very thin
Region.If burning is displaced to the expansion stage, flame may be extinguished due to the room temperature being gradually lowered and HC discharges
Increase equally occur.
Additionally, hydrocarbon emission increases, for example this is to leak the uncontrolled of caused fuel due to fuel nozzle
Pass through late or as relatively great amount of fuel collision is on cylinder or recess walls.
Carbon monoxide by mainly by attribution for unburned hydrocarbons incomplete oxidation.Though due to the Diesel engine
So partly there is rich mixture area in combustion, but it is overall with the operation of lean mixture state, therefore there is enough oxygen
Gas carries out CO oxidations.Rising is occurred in that in the case of the approximate air ratio to stoichiometric proportion.
With regard to the formation of nitrogen oxides, in substantially three kinds mechanism (according to the heating power type of Zdldovich Frank-Kamenetskii relation (Zeldovich)
NO, according to the Quick-type NO and burning type NO of Fenimore (Fenimore)) between make a distinction.
According to the thermal NO of Zdldovich Frank-Kamenetskii relation；In combustion process under high temperature (more than 2200K), with excess of oxygen
The nitrogen that strict inert nature occurs in the regional area of gas present in inlet air and lies in less than forms nitrogen oxidation
The reaction of thing (NOx).The nitrogen oxides are referred to as thermal NO and are produced according to Zdldovich Frank-Kamenetskii relation mechanism.Generally, exist
Nitrogen oxides have reaction at least known to 16 to participate in being formed.The each comfortable each side of all equations has two reaction partners
(bimolecular two-way reaction).Eight kinds of oxidised forms are known, and wherein only nitric oxide and nitrogen dioxide are and diesel engine
Machine burning correlation.Nitric oxide is defined during combustion phases.By contrast, nitrogen dioxide is to pass through at low temperature
The secondary product that nitric oxide production rear oxidation is formed.Therefore the major parameter for affecting the formation of thermal NO is temperature, burning position
Put oxygen concentration and local air ratio thus and the high temperature dwell time at place.
Formed at flame front, specifically under fuel-rich state according to the Quick-type NO of Fenimore.Pass through
Hydrocarbon group defines cyanide with the reaction of nitrogen molecular, is defined from the cyanide with the secondary response with the carrier of oxygen
NO.The formation of Quick-type NO is occurred in the case where air is lacked first, because only under fuel-rich conditions as CH groups
Precursor formed acetylene (acetylene).Yet with the low concentration of CH groups, such nitrogen oxides are formed and play secondary
Effect.
In combustion, by the nitrogen being bound in fuel by being decomposed to form simple amine and cyanide.It is described
Secondary nitrogen compound further reacts to form NO with oxygen.Due to nitrogen ratio contained in fuel it is very low, and only one part
NO is converted to, the ratio of the fuel NO in nitrogen oxides emissions can equally be ignored.
These Zdldovich Frank-Kamenetskii relation equations are enough for basic consideration.Near the limiting temperature of 2200K, occur
NOxFormation mechenism persistently slows down, and these mechanism are finally paused when less than the limiting temperature.
The particle emission limited by law is by soot and the Hydrocarbon accumulated, sulfide, ash, galling thing structure
Into.This formation is that occurred according to extremely complex mechanism and still do not have detailed explanation.If fuel is short in local air
There is Pintsch process process in the case of lacking and with the temperature combustion higher than 1400K or in fuel, Hydrocarbon
Burning may result in soot and be formed.Soot forming process is segmented into new granule formation, superficial growth, aggregation, reunion and rear oxygen
Change these partly while the stage for carrying out.
In the region of high oxygen concentration, the oxidation generation parallel with soot forming process of carbon soot particles.Due to the process,
Substantially the 5% of the maximum soot concentration that the soot emissions thing of diesel engine combusts only contemporaneously occurs.Soot oxidation is sent out
It is raw to be more than at a temperature of 1300K.In addition to molecular oxygen, soot aoxidize during also to other reaction partners for example
OH groups impart notable meaning.Oxidation rate increases with the rising of temperature and/or the rising of oxygen partial pressure.
The geometry of combustor contribute to substantial part similarly for the optimization of the combustion method.Injected system and
The mutual adaptation of combustion-chamber geometry is for having special importance using maximum capacity.Combustor has a ginseng to be optimized
The combination of the number shape that above all piston is recessed and air swirl, air swirl is by inlet duct and flat
Space, igniting boss and cylinder cover in closing space minimum and produce.Made in the way of fixing compression ratio
Substantial effect under fractional load and full load to engine characteristicses.For modern passenger cars Diesel engine,
Current development trend presents the reduction of compression ratio.Following concept has 17:1 and following compression ratio.By reducing pressure
Contracting terminal pressure and compressed ends temperature and reduce the formation of nitrogen oxides.Due to the longer freedom that larger recess diameter is obtained
Injection jet length improves mixture and prepares and therefore reduce soot and formed.The operating sky of full load is improved equally
Diarrhea due to disorder of QI is used, and this starts injection and not increasing maximum sharpness pressure causes the power output of Diesel engine to increase jointly with relatively early.
The reduction of compression ratio is had adverse effect for the formation of Hydrocarbon and carbon monoxide, because these reactions are due to relatively low
Compressed ends pressure and relatively low compressed ends temperature and stop, and therefore incomplete combustion carry out.Further disadvantage
It is burn significant degree decline (this can be partly compensated for by the adaptation started to injection) and cold start characteristics
It is impaired, especially under extremely low external temperature.Shortcoming in terms of cold start characteristics can pass through the glow plug for improving and send out
Hot strategy, the injecting strategy of optimization and injection jet with respect to glow plug adapted position tackling.
It is as with non-that common diesel burns after pre-mixing combustion in firing delay, introduced fuel quantity
The controlled diffusion combustion of the mixing of often uneven fuel/air ratio is carrying out.This contributes to first in local oxygen lack
Formation soot in area, and secondly diffusion combustion is carried out in the scope for be close to stoichiometric proportion at jet edge, and this leads
Cause the localized hyperthermia in combustion zone and contribute to thermal NO being formed according to Zdldovich Frank-Kamenetskii relation mechanism.By comparison, normal
There is uniform fuel/air mixture in the case of the petrol engine of rule ground operation.Burning is according to spark ignition, by tool
The advance flame front for having the very high temperature in local is carried out, and is thus obtained high NO and formed and almost no granulated
Into.
In the case of diesel engine combusts, the injected system has been assigned significance.Fuel is introduced directly into burning
In room and prepare fuel/air mixture and substantially affect combustion process, its significant degree and pollutant emission thing
Formation.In addition to injecting pressure, in the case of injected system, injection nozzle represents one of most important criterion.For
For combustion process, it is by the sphering and nozzle of bore dia, luffing angle, flow coefficient, nozzle hole entrance and outlet first
Hole number is adapted in the best way with the air movement in combustion-chamber geometry and combustor.
In the case of diesel engines, the exhaust aftertreatment that carried out by three-phase catalytic converter and as in gasoline
The regulation of the I=1 in the case of electromotor due to excess air run but it is impossible.For this reason, currently only
The oxidation catalytic converter for making carbon monoxide and hydrocarbon emission minimized is used and has been increasingly using
Particulate filter.
By with the common diesel combustion method being directly injected into the combination of oxidation catalytic converter, maintaining with regard to HC and CO
For the exhaust emission standards of current and future be possible.
By contrast, discharged nitrous oxides are reduced and particulate emission represents much bigger challenge, for this reason, in bavin
In the case of oil turbine, the focus of development activities is that this.
Generally, in the engine interior measure for reducing raw emissions and using having carried out area between exhaust after treatment system
Point.In exhaust aftertreatment field, diesel particulate filter is further being developed to minimize Particulate Emission.However, working as
Used in front prior art, the concept is associated with considerable fringe cost.These are included in particulate filter and NOx
Storage catalytic converter non-regenerative operating procedure in increase fuel consumption, in the case of some particulate filter technologies
Reducing agent to be carried (being for example urea in the case of SCR) in additional additive, vehicle, and be mainly used in being used it is expensive
The production cost of these parts of heavy metal.Additionally, can not be under low engine speed and load by necessarily raising aerofluxuss
Temperature and these regenerative operations are easily provided, its result is here for the vehicle for exclusively running in urban transportation is deposited
Further challenging.For described these reasons, the development focus of diesel engine combusts process must continue to be to start
The reduction of raw emissions inside machine, so which can avoid exhaust aftertreatment concept as far as possible or can be designed to
It is simpler.One advantageous development of the present invention is provided, and the injection nozzle is inclined from substantially 10 ° relative to piston longitudinal axis
To 25 °.Casing bore is in the range of from 90mm to 115mm.
The recess diameter (being represented with D1) of piston is in from the range of 70 to 95mm.In the highest region of piston concave bottom
Piston depression platform average diameter D2 in domain includes the scope from 0 to 10mm.In the most deep region of piston concave bottom
Piston is recessed radius R1 in from the range of 5 to 15mm.Piston is recessed radius R2 in from the range of 0 to 2mm.Piston is recessed
Sunken angle alpha 1 is in the range of from 0 ° to 50 °.Piston is recessed angle alpha 2 in the scope from 131 ° to 160 °
It is interior.Injection nozzle discharges angle gamma in the range of from 110 ° to 130 °.It is according to the whirlpool of Tippelmann methods
From DTI=0.3 to DTIIn the range of=0.4.
The cup depth represented with T1 is in from the range of 5 to 20mm.The spacing of the piston 1 represented with T2 is in from 2
To 10mm.
Hereinafter, by an exemplary embodiment in using accompanying drawing the present invention is explained in greater detail, in the accompanying drawings：
Fig. 1 shows the diagrammatic illustration of the piston with ω shapes piston depression and injection nozzle.
Fig. 1 shows the piston 1 with ω shapes piston depression 2.Injection nozzle 3 inclines relative to the longitudinal axis 4 of the piston
Oblique substantially 20 ° incline substantially 70 ° relative to piston crown 5.Casing bore in one exemplary embodiment be 98mm and
It is 108mm in another favourable improvement.
The recess diameter (being represented with D1) of piston 1 in the case of an exemplary embodiment be 81.2mm and
This another it is improved in the case of be 87mm.Piston depression platform average diameter in the highest zone of piston concave bottom 6
D2 include in the case of an exemplary embodiment 4.7mm and this another it is improved in the case of include 5.7mm.
Piston depression radius R1 in the most deep region of piston concave bottom 6 is 8mm in the two exemplary embodiments.Piston
Depression radius R2 is 0.5mm in the two exemplary embodiments.Piston is recessed angle alpha 1 in the two exemplary realities
30 ° are in applying example.Piston depression angle alpha 2 is 148 ° in the two exemplary embodiments.Injection nozzle is discharged
Angle gamma is 123 ° in both cases.D is in both cases according to the whirlpool of Tippelmann methodsTI=
0.35。
The cup depth 1 represented with T1 is 11.9mm and another at this in the case of an exemplary embodiment
It is individual it is improved in the case of be 12.75mm.The spacing of the piston 1 represented with T2 is in the case of an exemplary embodiment
4.7mm and this another it is improved in the case of be 5mm.
Claims (10)
1. a kind of compression ignition type explosive motor, the explosive motor have at least one cylinder and can come in the cylinder
The dynamic piston of return, the piston define combustor with the cylinder and are recessed with the piston towards the combustor；The internal combustion is sent out
Motivation has infusion appliance, and the infusion appliance is arranged at the piston depression top for injecting fuel in the piston depression.
2. compression ignition type explosive motor as claimed in claim 1, it is characterised in that the overall diameter D of the piston and cylinder
Hole is in the range of from substantially 90 to 115mm.
3. compression ignition type explosive motor as claimed in claim 1 or 2, it is characterised in that the concave shaped portion of piston depression
Divide the radius of curvature R 1 being at least partially substantially from 5 to 15mm.
4. the compression ignition type explosive motor as described in one or more in above claim, it is characterised in that from this
Size T2 of the peak that piston crown is recessed to the piston is in the range of from substantially 2 to 10mm.
5. the compression ignition type explosive motor as described in one or more in above claim, it is characterised in that the work
Peak equating and with the diameter D2 in the range of from substantially 0 to 10mm in the way of platform-like of plug depression.
6. the compression ignition type explosive motor as described in one or more in above claim, it is characterised in that from this
Piston crown to the deepest point of piston depression size T1 is in the range of from substantially 5 to 20mm and is generally in R1's
In the range of.
7. the compression ignition type explosive motor as described in one or more in above claim, it is characterised in that the work
The sunk surface of plug depression has truncated-pyramidal portion subregion, the butt between the region of the deepest point and the piston crown
Conical section region is oriented along the longitudinal axis of the piston, and by the depression of the frustoconical portion area configuration
Surface forms angle alpha 1 with the longitudinal axis of the piston, and the angle alpha 1 includes the scope substantially from 10 ° to 50 °.
8. the compression ignition type explosive motor as described in one or more in above claim, it is characterised in that the work
Plug depression formed from the deepest point of piston depression to peak, i.e. the branch of the platform-like equating part, the branch relative to
The longitudinal axis of the piston are substantially 74 °.
9. the compression ignition type explosive motor as described in one or more in above claim, it is characterised in that pacified
The infusion appliance for coming piston depression top is arranged to the longitudinal axis relative to the piston substantially into 20 ° of angle.
10. a kind of method for operating explosive motor, it is characterised in that using in such as above claim or many
Explosive motor described in.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014010714.0 | 2014-07-19 | ||
| DE102014010714.0A DE102014010714A1 (en) | 2014-07-19 | 2014-07-19 | combustion process |
| PCT/EP2015/001248 WO2016012068A1 (en) | 2014-07-19 | 2015-06-19 | Combustion method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106536889A true CN106536889A (en) | 2017-03-22 |
Family
ID=53502605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580039045.2A Pending CN106536889A (en) | 2014-07-19 | 2015-06-19 | Combustion method |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN106536889A (en) |
| BR (1) | BR112017000777A2 (en) |
| DE (1) | DE102014010714A1 (en) |
| RU (1) | RU2017102894A (en) |
| WO (1) | WO2016012068A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894757A (en) * | 2020-09-10 | 2020-11-06 | 天津大学 | A spark plug-assisted gasoline compression ignition combustion chamber |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10060334B2 (en) | 2016-06-01 | 2018-08-28 | Ford Global Technologies, Llc | Controlled air entrainment passage for diesel engines |
| AT524480A1 (en) * | 2021-04-02 | 2022-04-15 | Avl List Gmbh | Combustion system and internal combustion engine |
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- 2015-06-19 BR BR112017000777A patent/BR112017000777A2/en not_active Application Discontinuation
- 2015-06-19 RU RU2017102894A patent/RU2017102894A/en not_active Application Discontinuation
- 2015-06-19 WO PCT/EP2015/001248 patent/WO2016012068A1/en active Application Filing
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| CN111894757A (en) * | 2020-09-10 | 2020-11-06 | 天津大学 | A spark plug-assisted gasoline compression ignition combustion chamber |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2017102894A3 (en) | 2018-12-18 |
| BR112017000777A2 (en) | 2017-11-28 |
| WO2016012068A1 (en) | 2016-01-28 |
| RU2017102894A (en) | 2018-08-20 |
| DE102014010714A1 (en) | 2016-01-21 |
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Application publication date: 20170322 |