CN208089415U - Based on the change Stroke Engine under FCE patterns - Google Patents

Abstract

The utility model discloses the change Stroke Engines under a kind of pattern based on FCE, including air induction system, and there is multiple working cylinders and at least one fuel-flexible cylinder, air inlet manifold after a triple valve by being divided into two-way, it is working cylinder air inlet pipe all the way, another way is flexible cylinder air inlet pipe, and performance loop is connected between air inlet manifold and working cylinder air inlet pipe, fuel reforming circuit is connected between working cylinder air inlet pipe and flexible cylinder air inlet pipe；Flexible cylinder includes the inlet valve and exhaust valve being connected with cam mechanism, cam mechanism includes the characteristics of motion that cam profile A and B are used to control flexible cylinder valve, when flexible cylinder is in four stroke operation pattern identical with working cylinder, flexible cylinder valve selection is driven by cam profile A；When flexible cylinder is in two-stroke fuel reforming operating mode, flexible cylinder valve selection is driven by cam profile B, to make switching of the operating mode of flexible cylinder between two-stroke and four strokes according to engine actual condition demand.

Description

Based on the change Stroke Engine under FCE patterns

Technical field

The utility model is related to a kind of engine more particularly to a kind of flexible Cylinder engine FCE (Flexible Cylinder Engine) new combustion mode engine under pattern.

Background technology

It is a global problem to reduce as caused by vehicle exhaust environmental pollution and increase fuel efficiency, thus generation The scientists of various countries of boundary propose various new combustion mode [1-9] to alleviate this problem, including HCCI (homogeneous pressures in succession Fire Homogeneous Charge Compression Ignition), PPC (partly-premixed burning Partially Premixed Combustion), RCCI (activity control homogeneity compression-ignition Reactivity Controlled Compression Ignition) Deng.These novel combustion modes are realized efficiently by the attribute of the initial operating condition or fuel that change engine Energy saving this purpose.The graduate researcher of South West USA [10] proposes exhaust gas recycling (EGR) special engine cylinder Tactful (D-EGR) is to improve efficiency and the discharge of engine.According to D-EGR theories, part of gasoline fuel is special in exhaust gas recycling With being catalyzed into the small molecules such as hydrogen and carbon monoxide in engine cylinder, then mixed with remaining Fuel Petroleum and be imported into work Make to burn as fuel combination in cylinder.Result of study shows using D-EGR strategies, and the average thermal efficiency of engine can be with Improve 12-15%.Above-mentioned fuel reforming pattern can improve the efficiency of combustion of engine and reduce discharge, this is because reforming Fuel rich hydrogen afterwards, therefore the laminar burning velocity of fuel combination is improved, and widened the air-fuel ratio of fuel.It hands in Shanghai The researcher [11] of logical university proposes chemical thermal reforming TFR new combustion strategies, i.e., independent on a natural gas engine Go out a cylinder for reforming natural gas, be reformatted into H2 and CO, then imported into other cylinders and carry out subsequent combustion.As a result table Bright, BSHC, BSCO and BSNOx discharges reduce by 12%, 8% and 35% respectively.

However engine should be flexibly adjustable to adapt to actual condition in the larger context.It double fuel combustion mode and urges Change reforming mode and this demand may be implemented, but these patterns needs install a fuel tank or a set of catalysis additional again on automobile Reformer, these can all increase the load of automobile.Based on above-mentioned combustion strategies, Publication No. CN105134373, publication date is It is on December 9th, 2015, entitled《Based on the regulatable engine in combustion reaction path and its regulation and control method》Chinese patent text Variable cylinder reforming combustion strategy (Flexible cylinder engine, FCE) [12-13] is disclosed in offering.

[bibliography]

[1]Iwamoto Y.,et al.,Development of gasoline direct injection engine, 1997, SAE technical paper (Iwamoto Y. etc., directly jetting gasoline engine development, 1997, SAE technical papers).

[2]Kanda T.,et al.,PCCI operation with early injection of Conventional diesel fuel, 2005, SAE Technical Paper (early spray under Kanda T. etc., PCCI pattern Conventional diesel fuel, 2005, SAE technical papers).

[3]Kokjohn S.,et al.,Fuel reactivity controlled compression ignition (RCCI):a pathway to controlled high-efficiency clean combustion.International Journal of Engine Research,2011. 12(3):P.209-226 (Kokjohn S. etc., activity control compression ignition mould Formula (RCCI)：A kind of realization controllable high-efficiency clean combustion method engine research International Periodicals, 2011.12 (3):p.209- 226)。

[4]Reitz R.D.,Duraisamy G.,Review of high efficiency and clean reactivity controlled compression ignition(RCCI)combustion in internal combustion engines.Progress in Energy and Combustion Science,2015.46:p.12-71 (Reitz R.D., Duraisamy G., controllable high-efficiency clean combustion mode compression-ignition engine summary the energy and combustion science into Exhibition, 2015.46:p.12-71).

[5]Sgro L.A.,et al.,Investigating the origin of nuclei particles in GDI engine exhausts. Combustion and Flame,2012.159(4):p.1687-1692(Sgro L.A. Deng, particulate matter nucleation process research burnings and flame in GDI engine emission, 2012.159 (4):p.1687-1692).

[6]Stanglmaier R.H.,Roberts C.E.,Homogeneous charge compression ignition(HCCI): benefits,compromises,and future engine applications,1999,SAE Technical Paper (Stanglmaier R.H., Roberts C.E., homogeneity compression-ignition engine (HCCI):Advantage, it is feasible Scheme and alternate-engine application, 1999, SAE technical papers).

[7]Thring R.H.,Homogeneous-charge compression-ignition(HCCI)engines, 1989, SAE Technical paper (Thring R.H., homogeneity compression-ignition engine, 1989, SAE technical papers).

[8]Yao M.F.,Zheng Z,Liu H.F.,Progress and recent trends in homogeneous charge compression ignition(HCCI)engines.Progress in Energy and Combustion Science,2009.35(5):P.398-437 (Yao orders hair, Zheng Zunqing, Liu Haifeng, homogeneity compression-ignition engine Progress probes into the energy with recent trend and combustion science is in progress, 2009.35 (5):p.398-437).

[9]Zheng M.,Mulenga M.C.,et al.,Biodiesel engine performance and emissions in low temperature combustion.Fuel,2008.87(6):p.714-722(Zheng M., Mulenga M.C., etc., the performance of biodiesel engine and discharge fuel during low-temperature burning, 2008.87 (6): p.714-722)。

[10]Alger T.,Mangold B.,Dedicated EGR:a new concept in high efficiency engines.SAE international journal of engines,2009.2(2009-01-0694): P.620-631 (Alger T., Mangold B., special EGR:A kind of new high efficience motor concept .SAE engines international phase Print .2009.2 (2009-01-0694):p.620-631).

[11]Zhu L.,et al.,In-cylinder thermochemical fuel reforming(TFR)in a spark-ignition natural gas engine.Proceedings of the Combustion Institute, 2017.36(3):P.3487-3497 (Zhu Lei lights heat chemistry in Cylinder of Natural Gas Engine and reforms world Combustions etc., spark Meeting, 2017.36 (3):p.3487-3497).

[12]Wang Y.,Wei L.X.,Yao M.F.,A theoretical investigation of the effects of the low-temperature reforming products on the combustion of n- heptane in an HCCI engine and a constant volume vessel.Applied Energy, 2016.181:P.132-139 (Wang Yang defends the Beginning of summer, and Yao orders hair, and theoretical research low-temperature reformate is in hcci engine and determines Hold the burning performance .Applied Energy played in burner, 2016. 181:p.132-139).

[13]Yao MF,Wang Y,Jia GR,et al.Novel engine controlled by combustion reaction path and regulating method thereof.U.S.Patent Application No.15/268, 586 (Yao, which orders, to be sent out, Wang Yang, Jia Guorui, etc., novel controlled burning response path theoretical method United States Patent (USP)s, No.15/268, 586)。

Utility model content

The utility model provides the change Stroke Engine under a kind of pattern based on FCE, and flexible cylinder therein can be according to reality Working condition realizes two kinds of operating modes of two-stroke and four strokes by adjusting valve strategies, i.e., the flexible cylinder is as reformation cylinder weight Its operating mode is two-stroke when whole gasoline class antiknock gasoline, can increase the output increased reforming efficiency of fuel reforming； When the big load of engine needs enough power outputs, flexible cylinder is changed into four strokes.The utility model can be by flexible cylinder Operating mode switches between two-stroke and four strokes.

In order to solve the above-mentioned technical problem, the utility model proposes a kind of pattern based on FCE under change Stroke Engine, Include whirlpool including air induction system, and with multiple working cylinders and at least one fuel-flexible cylinder, the air induction system Turbine and booster, set on the air inlet manifold being connect with the booster, the air inlet manifold there are one air into Gas triple valve；The air inlet manifold is divided into two-way from after the air inlet triple valve, is all the way working cylinder air inlet pipe, separately It is all the way flexible cylinder air inlet pipe, performance loop is connected between the air inlet manifold and the working cylinder air inlet pipe, it is described It is connected with fuel reforming circuit between working cylinder air inlet pipe and the flexible cylinder air inlet pipe；The fuel reforming circuit is by flexible Successively by flexible cylinder injector, flexible cylinder, flexible cylinder exhaust three-way valve, reformation gas charge air cooler, reformation tracheae after cylinder air inlet pipe To mixing chamber；Wherein, reformation gas charge air cooler setting is on reforming tracheae, and between the flexible cylinder and the mixing chamber it Between；The flexible cylinder includes inlet valve and exhaust valve, and the inlet valve and exhaust valve are connected with a cam mechanism, the cam Mechanism is used to control the characteristics of motion of flexible cylinder valve, and the cam mechanism includes cam profile A and cam profile B, the spirit When cylinder living is in four stroke operation pattern identical with working cylinder, flexible cylinder valve selection is driven by cam profile A；It is described flexible When cylinder is in two-stroke fuel reforming operating mode, flexible cylinder valve selection is driven by cam profile B, to according to engine reality Border duty requirements make switching of the operating mode of the flexible cylinder between two-stroke and four strokes.

Further, the utility model is based on the change Stroke Engine under FCE patterns, wherein the shape of the cam profile A Shape realizes flexible cylinder and working cylinder four stroke operations pattern having the same.The shape of the cam profile B realizes fuel in spirit It is reformed twice in a cycle of engine in cylinder living.

Compared with prior art, the utility model has the beneficial effects that：

Based on the change Stroke Engine under FCE patterns in the utility model, there are two types of shapes for flexible cylinder valve cam tool Molded line, can be according to specific working condition residing for engine：When Smaller load, flexible cylinder is changed into reformation cylinder, corresponding by selecting Valve cam molded line realizes flexible cylinder two-stroke fuel reforming；When big load, flexible cylinder is changed into and conventional cylinder working function one Sample becomes four strokes and participates in work.Under reforming mode, flexible cylinder two-stroke is reformed to be reformed compared to four strokes, can be provided To the reformation gas that conventional cylinder is enough, reforming efficiency is improved.

Description of the drawings

Fig. 1 is a kind of based on antiknock gasoline engine structure schematic diagram under FCE patterns；

Valve state schematic diagram when Fig. 2 is flexible cylinder two-stroke in the utility model, wherein a is air inlet schematic diagram, and b is Compression, which is caught fire, reforms schematic diagram, and c is exhaust schematic diagram.

Valve state schematic diagram when Fig. 3 is flexible cylinder four-stroke, wherein a is air-suction state schematic diagram, and b is compressive state Schematic diagram, c are acting status diagrams, and d is exhaust condition schematic diagram.

Fig. 4 is that flexible cylinder reforms the activity of gas with the situation of change at exhauxt valve opens moment.

Fig. 5 is flexible cylinder valve cam molded line schematic diagram in the utility model engine, and wherein a is to realize four-stroke type Line, b are to realize two stroke molded line.

In figure：The flexible cylinder air inlet pipe of 1-, 2- working cylinder air inlet pipe, 3- mixing chambers, 4- work cylinder injector, 5- working cylinders into Gas manifold, 6- engines, 7- working cylinders, the flexible cylinders of 8-, 9- air inlets manifold, 10-EGR pipe, 11-EGR control valves, 12- increase Depressor, 13- turbines, 14- exhaust pipes, 15- total air escape pipes, 16- exhaust gas post-treatment devices, the flexible cylinder exhaust three-way valves of 17-, 18- reformation gas charge air coolers, the flexible cylinder injectors of 19-, 20- reformation tracheaes, 21- air inlet triple valves, 22-EGR charge air coolers, 23- inlet valves, 24- exhaust valves.

Specific implementation mode

Technical solutions of the utility model are described in further detail in the following with reference to the drawings and specific embodiments, it is described Specific embodiment is only explained the utility model, is not intended to limit the utility model.

The mentality of designing of the utility model is：In the utility model, flexible cylinder valve cam mechanism has two different Cam profile, by select different cam profile allow flexible cylinder between two-stroke and four-stroke operating mode into Row flexibly switching, and remaining conventional cylinder fixed design is four strokes.In this way design compared to flexible cylinder for four-stroke situation and Speech is supplied to the reformation gas of conventional cylinder more abundant, reforming efficiency higher.And need enough move when engine is in big load When power exports, flexible cylinder is converted into four strokes can becoming with conventional cylinder valve strategies.FCE mode engines are by flexible Cylinder and conventional cylinder form, and specific workflow is：Flexible cylinder is responsible for fuel reforming, and the reformation gas after reformation is after pipeline cools down It mixes to imported into conventional cylinder with fresh fuel and participates in burning.The utility model is based on the basis of FCE patterns specifically design one kind Flexible cylinder is 2 stroke/4 stroke, remaining conventional cylinder is four-stroke new concept engine, wherein the reformate in flexible cylinder Activity can be regulated and controled by controlling the start-up time of exhaust valve, and when flexible cylinder needs to be transformed into conventional cylinder due to operating mode, spirit The valve strategies of cylinder living are identical as conventional cylinder at this time, are transformed into four strokes, so that engine possesses enough work(in big load Rate exports.

The utility model proposes a kind of pattern based on FCE under change Stroke Engine, as shown in Figure 1, the engine packet Air induction system is included, and (such as with multiple working cylinders 7 and at least one fuel-flexible cylinder 8：The three flexible cylinders of one, cylinder machine, Two flexible cylinders of two working cylinders or six cylinder machines, four working cylinders form " one drag two " pattern), the air induction system Including turbine 13 and booster 12, the exhaust gas-driven turbine machine 13 from exhaust pipe 14 rotates, and turbine 13 drives booster 12 compression air inlets, realize plenum；On the air inlet manifold 9 being connect with the booster 12, the air inlet manifold 9 If there are one air inlet triple valve 21, the air inlet manifold 9 is divided into two-way from after the air inlet triple valve 21, one Road is working cylinder air inlet pipe 2, and another way is flexible cylinder air inlet pipe 1, the air inlet manifold 9 and the working cylinder air inlet pipe 2 Between be connected with performance loop, be connected between the working cylinder air inlet pipe 2 and the flexible cylinder air inlet pipe 1 fuel reforming return Road.

Turbocharger is made of turbine 13 and booster 12,13 turns of the exhaust gas-driven turbine machine from exhaust pipe 14 Dynamic, turbine 13 drives booster 12 to compress air inlet, realizes plenum；The air inlet triple valve 21 is controlled from sky The distribution of 9 air of gas inlet manifold and flow direction, prevent the difference due to pipeline inner pressure size cause in EGR pipe 10 by it is useless Gas flows back into air inlet manifold 9；The working cylinder air inlet pipe 2 will pass through the air or EGR of air inlet triple valve 21 It is imported into mixing chamber 3 with the gaseous mixture of air.21, the air inlet triple valve allow in air inlet manifold 9 into Qi leel does not flow to flexible cylinder air inlet pipe 1 and working cylinder air inlet pipe 2.The ECU being connected with engine is according to air inlet manifold 9, spirit The difference of pressure size comes from sky by the air inlet triple valve 21 control in cylinder air inlet pipe 1 and working cylinder air inlet pipe 2 living The distribution of the air of gas inlet manifold 9 and flow direction, to prevent in exhaust gas recirculation to air inlet manifold 9.

The performance loop is by booster 12, air inlet triple valve 21, working cylinder air inlet pipe 2, mixing chamber 3, working cylinder Inlet manifold 5, work cylinder injector 4, working cylinder 7, exhaust pipe 14, EGR valve 11, EGR charge air coolers 22, total air escape pipe 15 and exhaust After-treatment devices 16 etc. form.(or EGR and air is mixed for air of the mixing of the mixing chamber 3 from working cylinder air inlet pipe 2 Close gas) and the reformation gas through reformation tracheae 20 from flexible cylinder 8；The work cylinder injector 4 controls penetrating working cylinder internal combustion At the time of oily and measure；The EGR control valve 11 is also disposed in EGR pipe 10, controls the exhausted air quantity for importing mixing chamber 3；It is described EGR charge air coolers 22 are arranged on the pipeline of EGR pipe 10, between mixing chamber 3 and EGR control valve 11.

The fuel reforming circuit by flexible cylinder air inlet pipe 1, flexible cylinder injector 19, inlet valve 23, exhaust valve 24, flexibly Cylinder 8 reforms tracheae 20, reforms gas charge air cooler 18, the composition of mixing chamber 3.The fuel reforming system circuit enters flexible from fuel Successively by flexible cylinder injector 19, flexible cylinder 8, reformation tracheae 20, reformation gas charge air cooler 18 to the mixing after cylinder air inlet pipe Chamber 3；Wherein, the setting of reformation gas charge air cooler 18 mixes on reforming tracheae 20 and between the flexible cylinder 8 of reforming with described Between conjunction chamber 3.

The flexible cylinder 8 includes inlet valve 23 and exhaust valve 24, the inlet valve 23 and exhaust valve 24 with a cam machine Structure is connected, and the cam mechanism is used to control the characteristics of motion of flexible cylinder valve, and the cam mechanism includes cam profile A and convex Molded line B is taken turns, the flexible cylinder 8 is in four stroke operation pattern identical with working cylinder 7 (even if flexibly cylinder working pattern and routine Cylinder is identical) when, flexible cylinder valve selection is driven by cam profile A；The flexible cylinder 8 is in two-stroke fuel reforming operating mode When (fuel can be made to be reformed twice in a cycle of engine in flexible cylinder, the fuel to be supplied to working cylinder enough), spirit Cylinder valve selection living is driven by cam profile B, to make the work of the flexible cylinder 8 according to engine actual condition demand Switching of the pattern between two-stroke and four strokes.

Flexible cylinder and working cylinder having the same four may be implemented as shown in a in Fig. 5 in the shape of the cam profile A Stroke operation pattern.The shape of the cam profile B may be implemented fuel and start for one in flexible cylinder as shown in the b in Fig. 5 It is reformed twice in machine cycle.

When engine, which is in Smaller load, needs to promote flameholding, the flexible cylinder injector 19 is to the flexible cylinder 8 The overrich fuel oil that equivalent proportion is more than 1 is sprayed into, the flexible cylinder is two stroke operation pattern；As shown in Fig. 2, two stroke operation pattern Realizing the process of reforming cycle is,

Exhaust valve 24 1-1) is closed, inlet valve 23 is opened, air enters flexible cylinder 8；

1-2) when flexible cylinder 8 reaches lower dead center, inlet valve 23 and exhaust valve 24 are closed, flexible cylinder 8 starts low temperature compression Catch fire antiknock gasoline；

The start-up time that exhaust valve 24 1-3) is controlled according to selected cam profile, exports hair from the flexible cylinder 8 Active reformation gas introduces the working cylinder 7 needed for motivation is corresponding.

When the big load of engine needs enough power outputs, the flexible cylinder injector 19 is sprayed to the flexible cylinder 8 Enter normal concentration fuel oil, the flexible cylinder is four stroke operation patterns；It is followed as shown in figure 3, four stroke operation patterns are realized to reform The process of ring is：

Exhaust valve 24 2-1) is closed, inlet valve 23 is opened, air enters flexible cylinder 8；

2-2) when flexible cylinder 8 reaches lower dead center, inlet valve 23 and exhaust valve 24 are closed, flexible cylinder 8 starts compressing ignition Antiknock gasoline；

2-3) flexibly 8 descent of piston of cylinder does work and provides power output to engine；

Exhaust valve 24 2-4) is opened, the exhaust gas after burning is discharged by exhaust valve 24.

To sum up, the ECU being connected with engine is according to engine operation condition feature, by flexible cylinder valve cam molded line Selection, when flexible cylinder is as cylinder Reformed Gasoline class antiknock gasoline is reformed, the operating mode of the cylinder is two-stroke；And work as When the big load of engine needs enough power outputs, flexible cylinder is identical as conventional cylinder working pattern at this time, is changed into four strokes. Flexible cylinder working pattern can be switched between two-stroke and four strokes by the selection of valve cam molded line.Therefore flexible In cylinder two-stroke reforming process, by controlling the start-up time of flexible cylinder exhaust valve, the reformation of different reformation degree can be obtained Gaseous mixture, i.e. the reformation gas of different activities want different activities to reform gas so as to meet engine in broad range domestic demand Demand.And due to flexible cylinder be two-stroke this allow for being in a normal four-stroke cycle course of work when engine When, flexible cylinder can be reformed twice, therefore enough reformation gas can be provided to conventional cylinder, meet the needs of engine.

Although the utility model is described above in conjunction with attached drawing, the utility model is not limited to above-mentioned Specific implementation mode, the above mentioned embodiment is only schematical, rather than restrictive, the ordinary skill of this field Personnel are under the enlightenment of the utility model, in the case where not departing from the utility model aims, can also make many variations, this It belongs within the protection of the utility model a bit.

Claims (3)

1. the change Stroke Engine under a kind of pattern based on FCE, including air induction system, and with multiple working cylinders (7) and At least one fuel-flexible cylinder (8), the air induction system includes turbine (13) and booster (12), with the booster (12) the air inlet manifold (9) connected, sets that there are one air inlet triple valves (21) on the air inlet manifold (9)；

The air inlet manifold (9) is divided into two-way from after the air inlet triple valve (21), is all the way working cylinder air inlet pipe (2), another way is flexible cylinder air inlet pipe (1), is connected between the air inlet manifold (9) and the working cylinder air inlet pipe (2) There is performance loop, fuel reforming circuit is connected between the working cylinder air inlet pipe (2) and the flexible cylinder air inlet pipe (1)；

The fuel reforming circuit be by after flexible cylinder air inlet pipe (1) successively pass through flexible cylinder injector (19), flexible cylinder (8), Flexible cylinder exhaust three-way valve (17) reforms gas charge air cooler (18), reforms tracheae (20) to mixing chamber (3)；Wherein, the reformation gas Charge air cooler (18) is arranged on reforming tracheae (20), and between the flexible cylinder (8) and the mixing chamber (3)；

It is characterized in that：

The flexible cylinder (8) includes inlet valve (23) and exhaust valve (24), and the inlet valve (23) and exhaust valve (24) are with one Cam mechanism is connected, and the cam mechanism is used to control the characteristics of motion of flexible cylinder valve, and the cam mechanism includes cam type Line A and cam profile B, the flexible cylinder (8) are in working cylinder (7) when identical four stroke operations pattern, flexible cylinder valve Selection is driven by cam profile A；When the flexible cylinder (8) is in two-stroke fuel reforming operating mode, flexible cylinder valve selection It is driven by cam profile B, to make the operating mode of the flexible cylinder (8) in two-stroke according to engine actual condition demand With the switching between four strokes.

2. according to claim 1 based on the change Stroke Engine under FCE patterns, which is characterized in that the cam profile A's Shape realizes flexible cylinder and working cylinder four stroke operations pattern having the same.

3. according to claim 1 based on the change Stroke Engine under FCE patterns, which is characterized in that the cam profile B's Shape realizes that fuel is reformed twice in flexible cylinder in a cycle of engine.