CN105422327A - Variable EGR air intake system of compound injection dual-fuel internal combustion engine and control method - Google Patents
Variable EGR air intake system of compound injection dual-fuel internal combustion engine and control method Download PDFInfo
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- CN105422327A CN105422327A CN201510916759.9A CN201510916759A CN105422327A CN 105422327 A CN105422327 A CN 105422327A CN 201510916759 A CN201510916759 A CN 201510916759A CN 105422327 A CN105422327 A CN 105422327A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
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Abstract
The invention belongs to the technical field of internal combustion engines, and particularly relates to a variable EGR air intake system of a compound injection dual-fuel internal combustion engine and a control method. Based on torque requirements under working conditions with different loads and the purpose of achieving the maximum EGR rate, the invention discloses the variable EGR air intake system and the control method. According to the system, the EGR distribution states can be quickly switched; when in middle and small loads, homogeneous EGR distribution is achieved in an internal combustion engine cylinder; when in high loads, layered EGR distribution is achieved in the internal combustion engine cylinder; a venturi tube and an airflow pressure stabilization cavity are mounted on an EGR air intake introduction pipeline, so that the negative pressure in the pipeline can be conveniently controlled, the EGR tolerance is further improved, the exhaust gas pressure in the pipeline is maintained stable, and the airflow disturbance is reduced; the NOx emission can be effectively reduced, the requirements of loads for EGR distribution form and size are met, the internal combustion engine thermal efficiency can be improved, the fuel consumption rate is decreased, the fuel economy and emission performance of the internal combustion engine are effectively improved, and the large EGR rate is practicable.
Description
Technical field
The invention belongs to technical field of internal combustion engines, be specifically related to variable EGR gas handling system and the controlling method of a kind of composite injection (in-cylinder direct injection adds gas-duct jetting) double fuel ignition internal combustion engine.Be applicable to the composite injection double fuel ignition internal combustion engine adopting EGR technology.
Background technique
Oil is a kind of non-renewable fossil energy, along with the develop rapidly of World Economics, increasing sharply of auto output and recoverable amount, the pressure of oil demand is also day by day increased, how to realize more clean, burning more efficiently and become the subject matter that Ge great automobile vendor of the world faces, therefore the research of car combustion engine substitute fuel and EGR technology has extensively been carried out in countries in the world.In-cylinder direct injection internal-combustion engine has larger lifting than traditional combustion engine in fuel economy, but in the face of the Abgasgesetz of increasingly stringent, higher NOx emission limits the development of direct fuel-injection engine.Wherein, a part of waste gas is reintroduced back to cylinder by EGR (EGR) technology, reduces oxygen concentration and combustion temperature, effectively can control the NOx emission of motor, becomes a kind of important means improving discharge.In order to improve burning, improve fuel economy, realize the target of energy-saving and emission-reduction, also a lot of research work is carried out for substitute Fuel of Internal Combustion Engine aspect, wherein rock gas, liquefied petroleum gas (LPG), hydrogen fuel are with its excellent combustion characteristic, be used widely in field of internal combustion engine, therefore occurred bi-fuel internal combustion engine, utilize substitute fuel burning advantage, mix with traditional fuel, thus improve in-cylinder combustion state, reduce discharge, and internal-combustion engine EGR rate greatly allowable.Composite injection bi-fuel internal combustion engine, can combine advantage respective with both composite injection technology for double fuel, realizes the Integral lifting of engine performance.
The classification of EGR has a variety of, can be divided into homogeneous EGR and layering EGR according to the distribution of waste gas in cylinder, and in the cylinder of homogeneous EGR, EGR rate is relatively more even, and in the cylinder of layering EGR, EGR rate changes with spatial position.EGR technology be applied in the normal combustion reducing and also can affect ignition internal combustion engine while NOx emission to a certain extent, therefore should select different EGR distribution forms according to engine load operating mode, to obtain the optimization of whole internal-combustion engine performance.Introduce waste gas at middle Smaller load, can throttle opening be increased, the pumping loss in reduction during Smaller load; Introduce waste gas at large load, can pinking be suppressed, thus compression ratio can be improved further, improve the thermal efficiency, improve fuel economy.
Homogeneous EGR intake method, before the waste gas in outlet pipe is introduced directly into intake shutter, air inflow is decided by regulating the aperture of closure, there are some researches show, homogeneous EGR distribution mode is adopted when middle Smaller load, there are some researches show, EGR under middle Smaller load introduces the fuel consumption rate that can reduce 1%-3%, and when its reason is middle Smaller load, the reduction of the improvement main source pumping loss of internal-combustion engine Economy and MAT improve the reinforing function to fuel evaporation.Now homogeneous EGR distribution mode is more conducive to increase air inflow, reduces restriction loss further, simultaneously can larger EGR rate allowable.But waste gas is introduced too much, and can have a negative impact to burning, velocity of propagation of flame is slack-off.Layering EGR can solve the burn deterioration problem under high EGR rate, waste gas in outlet pipe is introduced directly in intake duct by so-called layering EGR, then directly enter in cylinder by intake valve, incoming mixture in cylinder around spark plug and introducing waste gas mix uneven, present the space distribution of band shape or layering, namely in a combustion chamber between or top is the mixed gas of fresh air and fuel, both sides or bottom are the mixed gas of waste gas or the large EGR rate introduced, can catch fire smoothly around spark plug when making like this to light a fire, so under high load operating mode, adopt layering EGR intake method, the tolerance of EGR can be improved further, improve the fuel economy of internal-combustion engine under high load greatly.
At present, for the EGR technology that ignition internal combustion engine adopts, only have single EGR air inlet distribution form, but lack the variable EGR distribution technique based on the adjustment of engine load demand.Especially for composite injection bi-fuel internal combustion engine, the improvement of fuel characteristic, can the introducing of waste gas greatly rate allowable, simultaneously according to target torque demand, the distribution form of EGR under adjustment different load, the improvement of the overall fuel economy of composite injection bi-fuel internal combustion engine can be obtained further, and the lifting of emission performance, this is also that Current internal combustion engines technical field lacks about composite injection bi-fuel internal combustion engine being applied variable EGR technology research institute.Therefore, design and develop that a kind of novel to be suitable for variable EGR gas handling system significant to the fuel economy improving composite injection bi-fuel internal combustion engine.
Summary of the invention
The object of the present invention is to provide the variable EGR gas handling system of a kind of composite injection bi-fuel internal combustion engine and controlling method, this variable EGR gas handling system can according to engine load condition selecting homogeneous EGR and layering EGR distribution mode, based target torque demand simultaneously, adjustment EGR aperture, choose suitable waste gas introducing rate, this gas handling system can take into account the demand of high low-load to EGR distribution form, can effectively reduce the NOx emission of internal-combustion engine; On the other hand, maximum EGR tolerance can be obtained on composite injection bi-fuel internal combustion engine, thus on traditional combustion engine basis, improve the power character of internal-combustion engine, Economy and emission performance further, especially reduce the discharge of NOx.
The present invention is achieved by the following technical programs, and accompanying drawings is as follows:
The invention provides a kind of variable EGR gas handling system of composite injection bi-fuel internal combustion engine, comprising: ignition internal combustion engine 20, first fuel injection system, the second fuel injection system, the first fuel supply system, the second fuel supply system, spark plug 14, gas handling system, vent systems, variable EGR (EGR) gas handling system, lambda sensor 12 and internal-combustion engine electronic control system 16; First fuel supply system is made up of the first fuel supplying device 23, first fuel feed line 21 and the first fuel injector 6; Second fuel supply system is made up of the second fuel supplying device 24, second fuel feed line 22 and the second fuel injector 7; Gas handling system is made up of closure 3, intake manifold 4, intake manifold 5 and intake valve 8; Vent systems is made up of gas exhaust manifold 10, exhaust manifold 11 and exhaust valve 9; Variable EGR gas handling system is made up of exhaust manifold 11, electric control EGR valve 13, Venturi tube 15, air-flow pressure stabilizing cavity 17, EGR cooling unit 18 and variable EGR modulating valve 19.
The variable EGR gas handling system of described a kind of composite injection bi-fuel internal combustion engine, comprise the first fuel supply system, the second fuel supply system unifies ignition system, the first fuel supply system, the second fuel supply system ignition system of unifying is connected with ignition internal combustion engine 20 with spark plug 14 respectively by the first fuel injector 6, second fuel injector 7; Variable EGR gas handling system by carrying out realize target EGR rate to the adjustment of electric control EGR valve 13, by the intake method being adjusted to a and b to realize homogeneous EGR and layering EGR to variable EGR modulating valve 19; The exhaust manifold 11 of variable EGR gas handling system, electric control EGR valve 13, Venturi tube 15, air-flow pressure stabilizing cavity 17, EGR cooling unit 18 are connected with variable EGR modulating valve 19 successively order; Internal-combustion engine electronic control system 16 by the control realization of closure 3, first fuel injector 6 and the second fuel injector 7 and spark plug 14 to the manipulation of this composite injection double fuel ignition internal combustion engine combustion system.
The variable EGR gas handling system of described a kind of composite injection bi-fuel internal combustion engine, coupled ignition internal combustion engine 20 adopts the fuel of two kinds of different attributes, be respectively the first fuel (main fuel) and the second fuel (auxiliary fuel), first fuel is present widely used fuel, mainly gasoline; Second fuel is the substitute fuel that performance is better than the first fuel, is mainly hydrogen, and its performance mainly comprises velocity of propagation of flame, ignition energy, knock limit and fire emission aspect.
The variable EGR gas handling system of described a kind of composite injection bi-fuel internal combustion engine, coupled ignition internal combustion engine 20 fuel supply system different from two kinds is connected, and is respectively the first fuel supply system and unifies the second fuel supply system; In dual fuel injection system, the first fuel injector 6 sprays the first fuel, and adopts the form of intake duct premixing to enter cylinder, and the second fuel injector 7 sprays the second fuel, and adopts the form of inner cylinder direct injection to enter cylinder.
Each combustion chamber of air cylinder 25 of the ignition internal combustion engine 20 described in the present invention comprises the second fuel injector 7, cylinder 26 and piston 29 end face in 2 intake valves, 8,2 exhaust valves 9, spark plug 14, cylinder, wherein piston 29 is the pit end face of air-flow leading type, be connected with piston ring 28 with connecting rod 30, the first fuel mixture that premix gets togather in intake manifold 4 enters cylinder after intake valve 8 is opened, with directly to spray into fitting piston 29 end face together with the second fuel in cylinder, form the stratified mixtures 31 needed; Wherein spark plug 14 is placed in firing chamber central authorities end face, and the second fuel injector 7 is installed in the side of firing chamber.
Gas handling system described in the present invention and vent systems, wherein gas handling system comprises gas handling system and is made up of closure 3, intake manifold 4, intake manifold 5 and intake valve 8, independent tubes separately by intake manifold to intake valve, to reduce the impact of flow perturbation on air inlet, realize stablizing air inlet, be conducive to when layering EGR air inlet simultaneously, effectively play the effect of drainage guiding, quick and precisely to realize the layer distributed of EGR in cylinder; Vent systems is made up of gas exhaust manifold 10, exhaust manifold 11 and exhaust valve 9, and exhaust valve waste gas out is also to gas exhaust manifold by independently pipeline communication, then enter exhaust manifold, avoid off-gas flows turbulence to cause in-cylinder pressure to fluctuate, affect desirable mixed Daqu.
The lambda sensor 12 be connected with outlet pipe in the present invention, it is connected with automatical control system 16, realizes the closed loop control to described Spark ignition type bi-fuel internal combustion engine 20 excess air coefficient.
The variable EGR gas handling system of described a kind of composite injection bi-fuel internal combustion engine, is characterized in that, comprise electric control EGR valve 13, and described EGR valve is arranged on and is connected on the EGR application pipeline of outlet pipe, regulates the aperture of EGR valve, realize target EGR rate value.
The throat pipe diameter ratio of Venturi tube of the present invention is 0.75, and described Venturi tube is arranged on and is connected on the EGR application pipeline of outlet pipe, and described Venturi tube inside and diffuser variable diameters place are all connected smoothly, to reduce flow losses; Described Venturi tube diffuser is conical, and its cone angle is 8 °, and compressing section cone angle is 16 °; Waste gas, by the trunnion place of described Venturi tube, produces different degree of vacuum in pipeline, realizes maximum waste gas and introduces ratio, guarantee that waste gas circulates smoothly and enter in intake duct; Voltage stabilizing environment is provided for giving the waste gas introduced, ensure pressure surge minimum in EGR application pipeline, air-flow pressure stabilizing cavity 17 is adopted after Venturi tube, and inner-wall material is the zigzag fashion absorbing material of the 45 ° of cone angles in surface, the pressure wave realized in pipeline farthest reflects in absorbing material surface, reflects and reduce its energy gradually in this air-flow pressure stabilizing cavity, realizes stream pressure stable in pressure stabilizing cavity.
EGR cooling unit 18 is connected on the EGR application pipeline of outlet pipe, this device is concentric pipe, the waste gas that inner circle circulates is introduced, cylindrical circulates cooling water, and cooling water flow is to contrary with exhaust gas flow direction, in the present invention to realize the cooling of maximum waste gas.
The invention provides a kind of variable EGR gas handling system of composite injection bi-fuel internal combustion engine, it is characterized in that, comprise variable EGR modulating valve 19, described variable EGR modulating valve can be communicated with separately a pipeline, also b pipeline be can independently be communicated with, thus homogeneous EGR intake method and layering EGR intake method realized respectively.
Consult shown in Fig. 7, the distributed rendering gas 31 of the new charge formed around spark plug 14 in described ignition internal combustion engine 20 cylinder and the waste gas of fuel mixture and introducing, it includes the stratified mixtures of different EGR rate, wherein exhaust gas section scale is 31I<31II<31III, first lighted at the mixed gas of the new charge amount around spark plug and fuel, then the exhaust gas section of mixed gas both sides and low side is transmitted to, after be distributed to whole firing chamber, realize two kinds of fuel mixtures and the mixed smooth combustion of introducing waste gas in described cylinder of internal-combustion engine, effective emission performance and Economy improving internal-combustion engine under high load.
The variable EGR gas handling system of described composite injection bi-fuel internal combustion engine adopts homogeneous EGR intake method at middle Smaller load, internal-combustion engine can be made to adopt larger throttle opening, further reduction restriction loss, improve the thermal efficiency of internal-combustion engine, reduce the discharge of NOx, therefore can improve economic performance and the emission performance of internal-combustion engine.
The variable EGR gas handling system of described composite injection bi-fuel internal combustion engine, comprise ignition internal combustion engine 20, the effect adopting two kinds of different fuels is by the good combustion characteristic of the second fuel self, reduce cyclical variations, improve in-cylinder combustion state, the lean combustion of further raising mixed gas at utmost, the discharge of thermal efficiency during raising lean-burn and reduction NOx, the realization of the second fuel effect of igniting is that the second fuel is spurted in cylinder at suitable time for spraying by inner combustion engine electric control system controls second fuel injector 7, by the rapid combustion of the second fuel, release energy so that light overall mixed gas in cylinder.
The invention also discloses a kind of controlling method of variable EGR gas handling system of composite injection bi-fuel internal combustion engine, described internal-combustion engine is bi-fuel internal combustion engine, adopt the fuel of two kinds of different attributes, regulate the distribution mode of EGR in cylinder based on load condition, the requirement to target EGR rate, discharge and fuel consumption rate under different load operating mode need be met.The further controlling method realizing variable EGR intake method is as follows:
(1) composite injection bi-fuel internal combustion engine is started smoothly;
(2) gather described internal-combustion engine 20 throttle position signal, tach signal and air fuel ratio signal under current loads operating mode, according to target torque demand inquiry storing value, determine amount of fresh air required under target torque; Described inquiry storing value is for being stored in advance in the amount of fresh air met required for economic performance and emission performance corresponding to described internal-combustion engine 20 different load and rotating speed of storage unit;
(3) internal-combustion engine electronic control system 16 judges the operating mode under current loads, determines engine load type, if under middle small load condition, based on homogeneous EGR intake method demand, enters step (4a); Otherwise, enter step (4b);
(4a) determine that internal-combustion engine is middle small load condition, regulate variable EGR modulating valve 19 to a pipeline communication, waste gas is introduced before closure, realize homogeneous EGR air inlet, then internal-combustion engine electronic control system 16 judges Current internal combustion engines combustion regime, the demand of based target EGR rate, regulates the aperture size of electric control EGR valve 13, realize target EGR rate;
(4b) determine that internal-combustion engine is high load operating mode, regulate variable EGR modulating valve 19 to b pipeline communication, introduce respectively in waste gas to a 4 tangential type intake duct 4, realize layering EGR air inlet, then internal-combustion engine electronic control system 16 judges Current internal combustion engines combustion regime, the demand of based target EGR rate, regulates the aperture size of electric control EGR valve 13, realize target EGR rate.
Compared with prior art, the present invention has following beneficial effect:
1, homogeneous EGR intake method is realized under present invention can be implemented in middle small load condition, before connection waste gas to closure is regulated to variable EGR modulating valve, internal-combustion engine can be made to adopt larger throttle opening, further reduction restriction loss, improve the thermal efficiency of internal-combustion engine, reduce the discharge of NOx, therefore can improve economic performance and the emission performance of internal-combustion engine.
2, present invention can be implemented in, under high load operating mode, connection waste gas to 4 intake duct is regulated to variable EGR modulating valve, and the Design of Inlet of described internal-combustion engine is tangential type intake duct, to realize layering EGR air inlet, realize two kinds of fuel mixtures and the mixed smooth combustion of introducing waste gas in described cylinder of internal-combustion engine, improve described internal combustion (IC) engine cylinder combustion state, improve the thermal efficiency of described composite injection double fuel ignition internal combustion engine 20, Economy and emission performance.
3, the internal-combustion engine that the present invention proposes is bi-fuel internal combustion engine, adopts the fuel of different attribute, improves the combustion regime of traditional fuel, expands lean flammability limit, improves combustion stability, reduces fuel consumption rate, realizes the effective rate of utilization of fuel.
4, the composite injection bi-fuel internal combustion engine of the present invention's proposition, wherein a kind of fuel adopts in-cylinder direct injection, can improve volumetric efficiency, improve compression ratio further, realizes maximum overall performance and promotes.
5, the present invention is by installing and the lambda sensor on outlet pipe, realizes the closed loop control of mixed gas excess air coefficient in cylinder.
Accompanying drawing explanation
Fig. 1 composite injection bi-fuel internal combustion engine system construction drawing.
Longitudinal section in Fig. 2 composite injection bi-fuel internal combustion engine cylinder.
Fig. 3 composite injection bi-fuel internal combustion engine total system schematic layout pattern.
Fig. 4 Venturi tube organigram.
The structural representation of Fig. 5 air-flow pressure stabilizing cavity.
The structural representation of Fig. 6 EGR cooling unit.
The EGR distribution schematic diagram formed around Fig. 7 spark plug.
Fig. 8 composite injection bi-fuel internal combustion engine variable EGR gas handling system control strategy flow chart.
In figure: 1 throttle body, 2 air-strainer, 3 closures, 4 intake manifold, 5 intake manifolds, 6 first fuel injectors, 7 second fuel injectors, 8 intake valves, 9 exhaust valves, 10 gas exhaust manifolds, 11 exhaust manifolds, 12 lambda sensors, 13 electric control EGR valves, 14 spark plugs, 15 Venturi tubes, 16 automatical control systems, 17 air-flow pressure stabilizing cavities, 18EGR cooling unit, 19 variable EGR modulating valve, 20 ignition internal combustion engines, 21 first fuel conduits, 22 second fuel conduits, 23 first fuel tanks, 24 second fuel tanks, 25 firing chambers, 26 cylinder head, 27 cylinder block, 28 piston rings, 29 pistons, 30 connecting rods, mixed gas in 31 cylinders.
Embodiment
Below in conjunction with accompanying drawing, technical solution of the present invention is further elaborated:
EGR in the present invention refers to EGR.
Consult shown in Fig. 1, described ignition type internal-combustion engine system is by ignition internal combustion engine 20, first fuel injection system, the second fuel injection system, the first fuel supply system, the second fuel supply system, spark plug 14, gas handling system, vent systems, variable EGR gas handling system, lambda sensor 12 and internal-combustion engine electronic control system 16; First fuel supply system is made up of the first fuel supplying device 23, first fuel feed line 21 and the first fuel injector 6; Second fuel supply system is made up of the second fuel supplying device 24, second fuel feed line 22 and the second fuel injector 7; Gas handling system is made up of closure 3, intake manifold 4, intake manifold 5 and intake valve 8; Vent systems is made up of gas exhaust manifold 10, exhaust manifold 11 and exhaust valve 9; Variable EGR gas handling system is made up of exhaust manifold 11, electric control EGR valve 13, Venturi tube 15, air-flow pressure stabilizing cavity 17, EGR cooling unit 18 and variable EGR modulating valve 19.
The first described fuel supply system, the second fuel supply system ignition system of unifying is connected with ignition internal combustion engine 20 with spark plug 14 respectively by the first fuel injector 6, second fuel injector 7; Variable EGR gas handling system is by carrying out realize target EGR rate to the adjustment of electric control EGR valve 13, by the intake method being adjusted to a and b to realize homogeneous EGR and layering EGR to variable EGR modulating valve 19, before a pipe is connected to closure, b pipe is connected respectively in 4 tangential type intake ducts; The exhaust manifold 11 of variable EGR gas handling system, electric control EGR valve 13, Venturi tube 15, air-flow pressure stabilizing cavity 17, EGR cooling unit 18 are connected with variable EGR modulating valve 19 successively order; Internal-combustion engine electronic control system 16 by the control realization of closure 3, first fuel injector 6 and the second fuel injector 7 and spark plug 14 to the manipulation of this composite injection double fuel ignition internal combustion engine combustion system.
Consult shown in Fig. 2, composite injection bi-fuel internal combustion engine described in the present invention adopts the fuel of two kinds of different attributes, first fuel enters in cylinder after adopting the mode of intake duct multi-point injection and fresh air premixing, and the second fuel adopts the mode of in-cylinder direct injection to enter in cylinder.Further, fresh air enters in cylinder of internal-combustion engine by closure 3, the aperture of closure also decides the amount of fresh air entered in cylinder simultaneously, first fuel injector 6 is installed in intake manifold 4, first fuel better can enter cylinder along air-flow, first fuel is sprayed at intake duct by the first fuel injector 6, and enters in cylinder after the fresh air premix entering intake manifold 4; Second fuel injector 7 is directly installed in cylinder head 26, and its spray orifice is positioned at the top of firing chamber 25, and the second fuel is directly sprayed in cylinder by the second fuel injector 7; Spark plug 14 is also arranged in cylinder head 26, is positioned at the side of firing chamber 25, and the position of spark plug 14 and the position of the second fuel injector 7 are wide-space, to meet the requirement of system stability burning work.
Consult shown in Fig. 3, composite injection bi-fuel internal combustion engine system layout framework described in the present invention is divided into three macroplates, air inlet plate, cylinder part and exhaust plate, described ignition internal combustion engine 20 has 4 cylinders, every cylinder has 4 valves, be respectively 2 intake valves and 2 exhaust valves, intake valve 8 is connected with intake manifold 4, exhaust valve more than 9 is connected with gas exhaust manifold 10, especially special, internal-combustion engine of the present invention adopts the corresponding intake duct standalone configuration of valve, the i.e. end lateral of the independent corresponding intake manifold of each valve, comprise intake valve and exhaust valve, can effectively reduce the disturbance of charge air flow motion to mixed gas in end lateral corresponding to each valve like this, be conducive to the distribution realize target EGR distribution form of EGR mixed gas in cylinder.
Venturi tube of the present invention, be installed on EGR and introduce in application pipeline, described Venturi tube is divided into contraction section, trunnion section and diffuser.According to the working principle of Venturi tube, utilize gas in Venturi tube, produce suitable air inlet restriction, before and after EGR valve, form pressure reduction.By Bernoulli's equation
with continuity equation S
1* ν
1=S
2* ν
2=Q, wherein p
1, v
1, S
1and p
2, v
2, S
2ρ is gas density, when waste gas flows in contraction section passage, gas can accelerate, and Mach number can increase, and subsonic gas is by producing an inflation process when Venturi tube, produce a compression process again, in inflation process, gas temperature and pressure can decline, so can produce degree of vacuum by the trunnion place of Venturi tube, utilize this degree of vacuum just can be introduced in gas handling system by waste gas smoothly.At diffuser, the waste gas of live gas and introducing carries out compression process, pressure increase, can reduce the pressure loss that contraction section brings.Meanwhile, after use Venturi tube, reduce the flow resistance of waste gas, the phenomenon that can effectively suppress EGR valve to block, can realize higher EGR rate in addition, reduces the power loss of motor.
Shown in participation Fig. 4, described Venturi tube 15 throat pipe diameter ratio is 0.75, and diffuser is conical, and its cone angle is 8 °, and compressing section cone angle is 16 °, introduces EGR further and produce degree of vacuum in pipeline, make introduce waste gas smoothly and avoid pipeline blockage.
Consult shown in Fig. 5, for ensureing that EGR introduces exhaust gas pressure in application pipeline and stablizes, the present invention introduces in application pipeline at EGR and is provided with air-flow pressure stabilizing cavity 17.Described air-flow pressure stabilizing cavity has a fixing volume, inwall to be a kind of surface tapering angle the be zigzag fashion absorbing material of 45 °, certain flow perturbation can be produced after Venturi tube for the waste gas introduced, the pressure wave produced through constantly reflecting, reflecting and Wave energy decay, can maintain the exhaust gas pressure entered in intake duct and stablizes and do not occur large airflow fluctuation in zigzag slot.
Consult shown in Fig. 6, for avoiding the exhaust gas temperature of introducing too high, need the waste gas to introducing in EGR pipe road to cool further, EGR cooling unit 18 is connected with variable EGR modulating valve 19 with air-flow pressure stabilizing cavity, is installed on EGR and introduces in application pipeline.In described EGR cooling unit, the flow direction of cooling water is contrary with exhaust gas flow direction; In addition, described EGR cooling unit is concentric circle pipeline, and what flow in large round pipe is cooling water, and what flow in little round pipe is waste gas, and such design can ensure that cooling liquid and waste gas are more large-area and contact, and realizes exchange heat greatly.
Consult shown in Fig. 7, under internal-combustion engine is in higher load condition, now EGR gas handling system should be in layering EGR intake method, in described composite injection bi-fuel internal combustion engine cylinder, EGR is distributed as layered model, in cylinder around spark plug or top of combustion chamber formed mixed gas 31, 31I is divided into according to the size of EGR rate in mixed gas, 31II, 31III tri-layers, the magnitude relationship of its EGR rate is 31I<31II<31III, described EGR layering is that cylinder axis EGR rate is more peripheral low, near spark plug, EGR rate is low, under being conducive to higher load condition like this, burning initial stage fire karyomorphism becomes and flame propagation, the deterioration of waste gas to burning can be alleviated, can effectively improve internal-combustion engine Economy and emission performance.
Variable EGR gas handling system of the present invention, regulate EGR three-way control valve 19 based on load condition, when three-way control valve is communicated with a pipeline, waste gas in outlet pipe is incorporated into before closure, follow the exhausted air quantity that throttle opening controls to enter in cylinder together, in cylinder, form equally distributed EGR state simultaneously; When three-way control valve is communicated to b pipeline, the waste gas in outlet pipe is directly introduced in the tangential type intake duct after closure, is then directly entered in cylinder by intake valve, in cylinder, form the distribution of layering EGR.
EGR rate controlling method of the present invention: 1) when homogeneous EGR intake method, EGR rate size is controlled by electric control EGR valve 13 and closure 3; 2) when layering EGR intake method, EGR rate size controls by electric control EGR valve 13 is independent.
Consulting shown in Fig. 8, is composite injection bi-fuel internal combustion engine variable EGR gas handling system control strategy flow chart.The variable EGR gas handling system of composite injection bi-fuel internal combustion engine of the present invention, its variable EGR controlling method realized, shown in composition graphs 8, explaination is as follows in detail further:
Smooth starting composite injection bi-fuel internal combustion engine; Gather described internal-combustion engine 20 throttle position signal, tach signal and air fuel ratio signal under current loads operating mode, according to target torque demand inquiry storing value, determine amount of fresh air required under target torque; Described inquiry storing value is for being stored in advance in the amount of fresh air met required for economic performance and emission performance corresponding to described internal-combustion engine 20 different load and rotating speed of storage unit; Internal-combustion engine electronic control system 16 judges the operating mode under current loads, determines engine load type, when internal-combustion engine is middle small load condition, based on homogeneous EGR intake method demand, regulate variable EGR modulating valve 19 to a pipeline communication, before closure, introduce waste gas, realize homogeneous EGR air inlet; Then internal-combustion engine electronic control system 16 judges Current internal combustion engines combustion regime, the demand of based target EGR rate, regulates the aperture size of electric control EGR valve 13, realize target EGR rate; When internal-combustion engine is high load operating mode, regulate variable EGR modulating valve 19 to b pipeline communication, introduce in waste gas to a 4 tangential type intake duct 4 respectively, realize layering EGR air inlet; Then internal-combustion engine electronic control system 16 judges Current internal combustion engines combustion regime, the demand of based target EGR rate, regulates the aperture size of electric control EGR valve 13, realize target EGR rate.
Claims (10)
1. the variable EGR gas handling system of composite injection bi-fuel internal combustion engine, comprising: ignition internal combustion engine (20), the first fuel injection system, the second fuel injection system, the first fuel supply system, the second fuel supply system, spark plug (14), gas handling system, vent systems, variable EGR (EGR) gas handling system, lambda sensor (12) and internal-combustion engine electronic control system (16); First fuel supply system is made up of the first fuel supplying device (23), the first fuel feed line (21) and the first fuel injector (6); Second fuel supply system is made up of the second fuel supplying device (24), the second fuel feed line (22) and the second fuel injector (7); Gas handling system is made up of closure (3), intake manifold (4), intake manifold (5) and intake valve (8); Vent systems is made up of gas exhaust manifold (10), exhaust manifold (11) and exhaust valve (9); Variable EGR gas handling system is made up of exhaust manifold (11), electric control EGR valve (13), Venturi tube (15), air-flow pressure stabilizing cavity (17), EGR cooling unit (18) and variable EGR modulating valve (19); It is characterized in that:
The first described fuel supply system, the second fuel supply system ignition system of unifying is connected with ignition internal combustion engine (20) with spark plug (14) respectively by the first fuel injector (6), the second fuel injector (7); Variable EGR gas handling system is by carrying out realize target EGR rate to the adjustment of electric control EGR valve (13), by the intake method being adjusted to a and b to realize homogeneous EGR and layering EGR to variable EGR modulating valve (19), before a pipe is connected to closure, b pipe is connected respectively in 4 intake ducts; The exhaust manifold (11) of variable EGR gas handling system, electric control EGR valve (13), Venturi tube (15), air-flow pressure stabilizing cavity (17), EGR cooling unit (18) are connected with variable EGR modulating valve (19) successively order; Internal-combustion engine electronic control system (16) by the control realization of closure (3), the first fuel injector (6) and the second fuel injector (7) and spark plug (14) to the manipulation of this composite injection double fuel ignition internal combustion engine combustion system.
2. the variable EGR gas handling system of a kind of composite injection bi-fuel internal combustion engine according to claim 1, it is characterized in that, coupled ignition internal combustion engine (20) adopts the fuel of two kinds of different attributes, be respectively the first fuel (main fuel) and the second fuel (auxiliary fuel), first fuel is present widely used fuel, mainly gasoline; Second fuel is the substitute fuel that performance is better than the first fuel, is mainly hydrogen, and its performance mainly comprises velocity of propagation of flame, ignition energy, knock limit and fire emission aspect.
3. the variable EGR gas handling system of a kind of composite injection bi-fuel internal combustion engine according to claim 1, it is characterized in that, described ignition internal combustion engine (20) fuel supply system different from two kinds is connected, and is respectively the first fuel supply system and unifies the second fuel supply system; In dual fuel injection system, first fuel injector (6) sprays the first fuel, and adopting the form of intake duct premixing to enter cylinder, the second fuel injector (7) sprays the second fuel, and adopts the form of inner cylinder direct injection to enter cylinder.
4. the variable EGR gas handling system of a kind of composite injection bi-fuel internal combustion engine according to claim 1, it is characterized in that, described ignition internal combustion engine (20) each combustion chamber of air cylinder (25) comprises 2 intake valves (8), 2 exhaust valves (9), spark plug (14), second fuel injector (7) in cylinder, cylinder head (26) and piston (29) end face, wherein piston (29) the pit end face that is air-flow leading type, be connected with piston ring (28) with connecting rod (30), the first fuel mixture that premix gets togather in intake manifold (4) enters cylinder after intake valve (5) is opened, with directly to spray into fitting piston (29) end face together with the second fuel in cylinder, form the stratified mixtures (31) needed, wherein spark plug (14) is placed in firing chamber central authorities end face, and the second fuel injector (7) is installed in the side of firing chamber.
5. the variable EGR gas handling system of a kind of composite injection bi-fuel internal combustion engine according to claim 1, it is characterized in that, described ignition internal combustion engine (20) is connected with vent systems with gas handling system, wherein gas handling system comprises gas handling system by closure (3), intake manifold (4), intake manifold (5) and intake valve (8) composition, independent tubes separately by intake manifold to intake valve, to reduce the impact of flow perturbation on air inlet, realize stablizing air inflow, be conducive to when layering EGR air inlet simultaneously, effectively play the effect of drainage guiding, quick and precisely to realize the layer distributed of EGR in cylinder, vent systems is made up of gas exhaust manifold (10), exhaust manifold (11) and exhaust valve (9), and exhaust valve waste gas out is also to gas exhaust manifold by independently pipeline communication, then exhaust manifold is entered, avoid off-gas flows turbulence to cause in-cylinder pressure to fluctuate, affect desirable mixed Daqu.
6. the variable EGR gas handling system of a kind of composite injection bi-fuel internal combustion engine according to claim 1, it is characterized in that, comprise lambda sensor (12), be connected with automatical control system (16), realize the closed loop control to described Spark ignition type bi-fuel internal combustion engine (20) excess air coefficient.
7. the variable EGR gas handling system of a kind of composite injection bi-fuel internal combustion engine according to claim 1, it is characterized in that, comprise the EGR introducing application pipeline that electric control EGR valve (13), Venturi tube (15), air-flow pressure stabilizing cavity (17) and EGR cooling unit (18) form, described EGR valve, Venturi tube, air-flow pressure stabilizing cavity and EGR cooling unit are installed in and are connected on the EGR application pipeline of outlet pipe, regulate the aperture of electric control EGR valve (13), realize target EGR rate value; Venturi tube (15) inside and diffuser variable diameters place are all connected smoothly, and its throat pipe diameter ratio is 0.75, and diffuser is conical, and its cone angle is 8 °, and compressing section cone angle is 16 °; The inner-wall material of air-flow pressure stabilizing cavity (17) is absorbing material, this absorbing material surface is the zigzag fashion of 45° angle, realize pressure wave farthest to reflect in absorbing material surface, reflect and reduce its energy gradually, guarantee stream pressure stable in pressure stabilizing cavity; EGR cooling unit (18) is concentric pipe, the waste gas that inner circle circulates is introduced, cylindrical circulates cooling water, and cooling water flow is to contrary with exhaust gas flow direction, to realize the cooling of maximum waste gas.
8. the variable EGR gas handling system of a kind of composite injection bi-fuel internal combustion engine according to claim 1, it is characterized in that, comprise variable EGR modulating valve (19), described variable EGR modulating valve can be communicated with separately a pipeline, also b pipeline be can independently be communicated with, thus homogeneous EGR intake method and layering EGR intake method realized respectively.
9. realize a controlling method for variable EGR intake method based on a kind of composite injection bi-fuel internal combustion engine according to claim 1 variable EGR gas handling system, it is characterized in that, comprise the following steps:
(1), composite injection bi-fuel internal combustion engine is started smoothly;
(2), gather described internal-combustion engine (20) throttle position signal, tach signal and air fuel ratio signal under current loads operating mode, according to target torque demand inquiry storing value, determine amount of fresh air required under target torque; Described inquiry storing value is for being stored in advance in the amount of fresh air met required for economic performance and emission performance corresponding to described internal-combustion engine (20) different load and rotating speed of storage unit;
(3), internal-combustion engine electronic control system (16) judges under current loads operating mode, determines engine load type, if under middle small load condition, based on homogeneous EGR intake method demand, enters step (4a); Otherwise, enter step (4b);
(4a), determine that internal-combustion engine is middle small load condition, regulate variable EGR modulating valve (19) to a pipeline communication, waste gas is introduced before closure, realize homogeneous EGR air inlet, then internal-combustion engine electronic control system (16) judges Current internal combustion engines combustion regime, the demand of based target EGR rate, regulates the aperture size of electric control EGR valve (13), realize target EGR rate;
(4b), determine that internal-combustion engine is high load operating mode, regulate variable EGR modulating valve (19) to b pipeline communication, introduce the intake manifold (4) of waste gas respectively to 4 cylinder after closure, and this intake duct is tangential type intake duct, layering EGR air inlet can be realized, then internal-combustion engine electronic control system (16) judges Current internal combustion engines combustion regime, the demand of based target EGR rate, regulate the aperture size of electric control EGR valve (13), realize target EGR rate.
10. a kind of composite injection bi-fuel internal combustion engine according to claim 9 variable EGR gas handling system realizes the controlling method of variable EGR intake method, it is characterized in that, carry out based on homogeneous EGR intake method under middle small load condition to described ignition internal combustion engine (20), before connection waste gas to closure is regulated to variable EGR modulating valve; After connection waste gas to closure being regulated to variable EGR modulating valve under high load operating mode, realize layering EGR air inlet, further improvement described internal combustion (IC) engine cylinder combustion state, improves the thermal efficiency of described composite injection double fuel ignition internal combustion engine (20), Economy and emission performance.
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