CN204961094U - Two gaseous fuel's of direct injection internal -combustion engine under EGR condition - Google Patents
Two gaseous fuel's of direct injection internal -combustion engine under EGR condition Download PDFInfo
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- CN204961094U CN204961094U CN201520503603.3U CN201520503603U CN204961094U CN 204961094 U CN204961094 U CN 204961094U CN 201520503603 U CN201520503603 U CN 201520503603U CN 204961094 U CN204961094 U CN 204961094U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The utility model relates to a two gaseous fuel's of direct injection internal -combustion engine under EGR condition. The utility model relates to a go out a two gaseous fuel's of direct injection internal -combustion engine under EGR condition, aim at improving the gaseous fuel engine the thermal efficiency, reduce its NOX and discharge and solve the unstable problem of direct injection engine layering lean -burn. The all mistakes of this department with two kinds of equal direct injection of fuel to the jar in, realized that the matter of internal -combustion engine load is adjusted, the gaseous engine thermal efficiency of the formula of lighting has obtained improvement by a wide margin, the control method of this system passes through mode conversion, can make the engine all move down at the best state in arbitrary operating mode to can all realize thin burning starting operating mode, idling, medium and small load condition etc. Great improvement economic nature, in addition, the emission of discharging high shortcoming, adoption EGR technique and lean -burn catalytic converter reduction tail gas to this engine NOX.
Description
Technical field
The utility model relates to Vehicular internal combustion engine technical field, particularly relates to the internal-combustion engine of the two gaseous fuel of in-cylinder direct injection under a kind of EGR condition.
Background technique
World today's environmental problem and energy crisis grow in intensity; this century the mankind must faced by be not only energy crisis; environmental pollution also can not be ignored; and the product of energy development and utilization is the important sources of environmental pollution; so various countries are more and more stricter for the formulation of automobile emission regulation; and in line with energy-conservation principle, also vehicle economy is had higher requirement.In order to tackle the challenge of energy crisis and environmental problem, people need a kind of new method to make automobile reach the object of energy-saving and emission-reduction, and therefore Ge great auto vendor racks one's brains, and finds new technology.
Traditional ignition internal combustion engine fuel is generally in manifold injection, this more or less has certain drawback for liquid fuel or gaseous fuel, liquid fuel is understood some and is formed oil film at intake duct, and gaseous fuel can take certain mixed gas volume, causes volumetric efficiency to decline.Based on this, in-cylinder direct injection technology is arisen at the historic moment.As its name suggests, in-cylinder direct injection technology injects fuel directly into cylinder exactly, accurately can control air fuel ratio, its responsiveness compares intake port injection larger lifting, and in-cylinder direct fuel-injection engine can adopt layering lean burn technology, the thermal efficiency of motor is promoted effectively, and the discharge of motor can be improved.And the deficiency of lean burn technology is that combustion stability is bad, select that a kind of diffusion velocity is fast, the gaseous fuel of flame propagation speed just can solve this problem.
EGR technology a part for motor exhaust is reintroduced back to cylinder by certain approach and participates in the technology of combustion process, and main purpose utilizes the NO that waste gas specific heat capacity is high, dilute fresh air, slow down the effect of rate of burning reduction motor
xdischarge.EGR technology is generally applied on a diesel engine, but along with the appearance of in-cylinder direct fuel-injection engine, it adopts lean-burn when sub load, makes oxygen concentration in cylinder comparatively large, add with supercharging technology with the use of making in-cylinder combustion temperature also very high, cause NO
xdischarge increases, so EGR technology is also applied in in-cylinder direct injection spark-ignition engine gradually now.On the other hand, the introducing of EGR is also conducive to the pinking of inhibition point combustion engine.
Summary of the invention
The utility model relates to the two gaseous propellant engine of a kind of in-cylinder direct injection.The utility model designs the internal-combustion engine of the two gaseous fuel of in-cylinder direct injection under a kind of EGR condition, is intended to improve the thermal efficiency of gaseous propellant engine, reduces its NO
xthe problem of discharge and solution in-cylinder direct fuel-injection engine layering lean-burn instability.This system is by by two kinds of fuel, all directly spray is in cylinder, and achieve the quality regulate of engine load, comparatively the Spark ignition type gas engine thermal efficiency obtains and significantly improves; The controlling method of this system, by patten transformation, can make motor run under the state of any operating mode all in the best, and can all realize lean combustion at start operating performance, idling, middle small load condition etc., improve Economy greatly; In addition, for this motor NO
xdischarge high shortcoming, adopt EGR technology and lean-burn catalyst to reduce the discharge of tail gas.
For achieving the above object, the utility model is achieved by the following technical programs, and accompanying drawing illustrates:
The internal-combustion engine of the two gaseous fuel of in-cylinder direct injection under a kind of ERG condition, this system is converted by spark-ignition engine 25, and eliminating closure, its structure is made up of spark-ignition engine 25, air-strainer 4, exhaust-gas turbocharger 5, intercooler 6, EGR valve 3, lambda sensor 2, lean-burn catalyst 1 etc.; Its fuel supply system comprises main gaskraftstoffzufuhranlage and auxiliary fuel supply-system, main gaskraftstoffzufuhranlage is made up of main gaseous fuel storage tank 13, pressure regulator valve 11, solenoid valve 9 and main gaseous fuel delivery line 8, auxiliary gas fuel supply system is made up of auxiliary gas fuel reservoir tank 14, pressure regulator valve 12, solenoid valve 10 and auxiliary gas fuel pump deliver line 7, and main gaseous fuel and auxiliary gas fuel are respectively by main gaseous-fuel injector 23, auxiliary gas fuel injector 19 direct cylinder injection; When to burn simultaneously main gaseous fuel and auxiliary gas fuel time, the features such as, flame propagation speed fast based on auxiliary gas fuel diffusion velocity, mixed gas good mixing, velocity of combustion is fast, cylinder temperature is higher, adds this system and eliminates closure, and Load Regulation mode is quality regulate, pumping loss is less and air inflow is more, so NO
xdischarge higher, egr system need be increased to limit NO
xdischarge, and use lean-burn catalyst to process tail gas.ECU is by receiving engine speed, load and each sensor signal thus realizing the control to main gaseous-fuel injector 23, auxiliary gas fuel injector 19, spark plug 20, EGR valve 3.
Described two gaseous fuels, they have respective fuel supply system, wherein, main gaseous fuel is antiknock gasoline, and auxiliary gas fuel is compared to main gaseous fuel, its flame propagation speed, ignition energy are low, quenching distance is short, so can promote that fuel is at low-load Thorough combustion, improve Economy, reduce cyclical variations; And auxiliary gas fuel fire boundary is broad, can expand the lean-burn scope of internal-combustion engine, is conducive to improving its thermal efficiency; But the more main gaseous fuel of net energy density of auxiliary gas fuel is low.
Described egr system, its feature part is, by with the addition of an air pipe 24 in intake duct, this air pipe is outside intake duct, keep parallel with air flue profile streamline, and make air pipe end be deep near head portion that, to stop the too early blending of air and waste gas as much as possible, waste gas and the layering of air inlet in cylinder can be realized like this, be controlled in by waste gas near cylinder wall surface, inflammable mixture is distributed in zone line, ensures the impact not by waste gas near time of ignition spark plug, thus play the effect of waste gas to greatest extent, at reduction NO
xwhile discharge, also reduce the heat transfer loss of motor.
Described two gaseous fuel injection systems, comprise main gaseous-fuel injector 23 and auxiliary gas fuel injector 19, these two spargers are arranged in cylinder, and auxiliary gas fuel injector 19 is arranged in the central position of cylinder, main gaseous-fuel injector 23 is arranged in edge of combustion chamber, spark plug 20 is near the nozzle of auxiliary gas fuel injector 19, auxiliary gas fuel generally sprays into cylinder in compression stroke, fuel directly can spray to spark plug, this kind of spray regime, denseer mixed gas can be formed near spark plug, and certain concentration gradient can be formed, contribute to the stratified mixture combustion of mixed gas, and be gaseous fuel due to what spray, pilot fuel injector 19 and spark plug 20 can be avoided to form carbon distribution.
Motor does not always run under a certain operating mode, and its working procedure is complicated and changeable, and its operating conditions roughly can be divided into cold start-up operating mode, idling and small load condition, at a high speed, high load working condition.And the selection of its controlling method, often need to consider the emphasis of motor performance such as power character, economical, emission performance under this operating mode.
The controlling method of the internal-combustion engine of the two gaseous fuel of in-cylinder direct injection under a kind of ERG condition, in engine operation process, adopt fuel and operating mode coordination control strategy, auxiliary gas fuel is only adopted in cold start-up operating mode, adopt the fuel combination of main gaseous fuel and auxiliary gas fuel in idling and small load condition, only adopt main gaseous fuel at high speed, high load working condition.
In cold-start phase, the requirement of motor to power character is lower, does not need external output work, and burning institute work only needs the running meeting motor self, and as far as possible the requirement of cold-start phase motor to performance reduce the discharge of motor in this stage.Due to features such as auxiliary gas fuel diffusion velocity is fast, flame propagation speeds, the perfect combustion of fuel energy, compared to the discharge of traditional ignition internal combustion engine, itself HC and CO discharges and obviously reduces, and lower at cold-start phase cylinder temperature, adopt pure auxiliary gas fuel to cause NO
xrising, so adopt auxiliary gas fuel combustion effectively can improve the discharge of motor in cold-start phase; At idling and small load condition, motor to the requirement of performance in Economy and emission performance, this demands motor has lower fuel consumption rate and lower discharge, although this stage is not harsh to the requirement of engine power performance, but because the net volume energy density of auxiliary gas fuel is lower, power character requirement cannot be met, so adopt main gaseous fuel and auxiliary gas fuel mix, certain driving power can be met, the burning of motor under idling and small load condition and emission performance can be improved again; At a high speed, under high load working condition, the requirement of motor to performance is to need its power character to export larger power, so select pure antiknock gasoline, namely adopt main gas fuel combustion.
As mentioned above, when to burn simultaneously main gaseous fuel and auxiliary gas fuel time, the features such as, flame propagation speed fast based on auxiliary gas fuel diffusion velocity, mixed gas good mixing, flame propagation speed, cylinder temperature is higher, adds this system and eliminates closure, add air inflow while reducing pumping loss, cause NO
xdischarge higher, increasing egr system can limit NO
xdischarge, so formulation engine control strategy in, need to carry out synergic adjustment to EGR rate, mixed Daqu mode and air fuel ratio.
A controlling method for in-cylinder direct injection dual-fuel internal-combustion engine under ERG condition, carries out synergic adjustment by EGR rate, mixed Daqu mode and air fuel ratio, does not adopt EGR in cold start-up operating mode; Adopt little EGR rate in idling and small load condition, and adopt large air fuel ratio, main gaseous fuel and auxiliary gas fuel all adopt layering lean-burn; Adopt large EGR rate in moderate duty operating mode, and adopt less air fuel ratio, but mixed gas is final still slightly rare on the whole, main gaseous fuel adopts even lean-burn, and auxiliary gas fuel adopts layering lean-burn; Do not adopt EGR at high load working condition, mixed gas is power mixed gas, adopts main gaseous fuel and for homogenous combustion.
Under cold start-up operating mode, for ensureing the normal combustion of fuel, do not adopt EGR; Only adopt auxiliary gas fuel combustion simultaneously, for ensureing the Economy of motor and reducing discharge, the phase sprays into cylinder to auxiliary gas fuel after the compression stroke, can form denseer mixed gas near spark plug, and can form certain concentration gradient, in cylinder, the combustion regime of mixed gas is layering lean-burn.
Under idling and small load condition, the requirement of motor to power character is not very harsh, now adopts less EGR rate, and object is to carry out certain heating to mixed gas in cylinder, thus enables mixed gas rapid combustion; For ensureing the Economy of motor, adopt larger air fuel ratio, and the phase injection all after the compression stroke of main gaseous fuel and auxiliary gas fuel, but the time for spraying of auxiliary gas fuel is later than main gaseous fuel time for spraying, the wall of main gaseous fuel and firing chamber interacts and defines inflammable mixture, and in cylinder eddy current, roll stream and piston top surface special shape acting in conjunction under be directed into spark plug, near spark plug, define certain concentration gradient; Auxiliary gas fuel then sprays into firing chamber when closing on top dead center, because auxiliary gas fuel directly sprays to spark plug, denseer mixed gas can be formed near spark plug, the feature such as, flame propagation speed low based on auxiliary gas fuel ignition energy again, in cylinder, mixed gas there will be good combustion regime.
Under moderate duty operating mode, motor increases compared to idling and small load condition to the requirement of power character, namely while the good Economy of guarantee motor, also has certain requirement to power character.Compared to small load condition, the main gaseous fuel of same employing and auxiliary gas fuel mix, but for ensureing power character requirement, the Blend proportion regular meeting of auxiliary gas fuel reduces, and main gaseous fuel is no longer above-mentioned layering lean-burn, and adopts the mode of even lean-burn, namely main gaseous fuel sprays in cylinder in the intake stroke, with air Homogeneous phase mixing in cylinder, and auxiliary gas fuel still sprays into cylinder when closing on top dead center, forms stratified mixtures; For the output of guaranteed output, can decrease compared to small load condition air fuel ratio, but overall air fuel ratio is still greater than 1 in cylinder, because main gaseous fuel mixes more even with air, in cylinder, mixture combustion speed is accelerated, and cylinder temperature increases, again because air fuel ratio overall in cylinder is greater than 1, oxygen concentration is higher, so NO
xdischarge also can increase, and larger EGR rate now just need be adopted to limit NO
xdischarge.
At high load working condition, for ensureing the Power output of motor, now adopting main gas fuel combustion, and not using EGR, ensure that motor is to the requirement of power character by combustion power mixed gas.
Accompanying drawing explanation
Fig. 1 is the system construction drawing of the two gaseous propellant engine of in-cylinder direct injection.
Fig. 2 is the two gaseous propellant engine longitudinal section of in-cylinder direct injection.
Fig. 3 is the two gaseous propellant engine egr system schematic diagram of mechanism of in-cylinder direct injection.
Fig. 4 is the two gaseous propellant engine control strategy figure of in-cylinder direct injection.
In figure: 1-lean-burn catalyst, 2-lambda sensor, 3-EGR valve, 4-air-strainer, 5-exhaust-gas turbocharger, 6-intercooler, 7-auxiliary gas fuel pump deliver line, 8-main gaseous fuel delivery line 9, 10-solenoid valve 11, 12-pressure regulator valve, 13-main gaseous fuel storage tank, 14-auxiliary gas fuel reservoir tank, 15-piston, 16-piston ring, 17-intake duct, 18-intake valve, 19-auxiliary gas fuel oil sprayer, 20-spark plug, 21-exhaust valve, 22-outlet pipe, 23-main gaseous-fuel injector 24-air pipe, 25-motor
Embodiment
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing illustrated embodiment.
Fig. 1 is the system construction drawing of the two gaseous propellant engine of in-cylinder direct injection.This system is made up of motor 25, lean-burn catalyst 1, lambda sensor 2, EGR valve 3, air-strainer 4, airplane turbine pressurized machine 5, intercooler 6, auxiliary gas fuel pump deliver line 7, main gaseous fuel delivery line 8, solenoid valve 9 and 10, pressure regulator valve 11 and 12, main gaseous fuel storage tank 13, the main gaseous fuel storage tank 14 of good fortune.Air enters gas handling system through air-strainer 5, under the effect of exhaust-gas turbocharger 5, carry out supercharging, because air temperature after supercharging raises, cools, to improve volumetric efficiency so the air after pressurization enters in intercooler 6; Based on the feature of this motor, comparatively general point combustion engine is high for cylinder temperature, and because be all in lean burn under this much of its operating mode, therefore adopt egr system to reduce this motor NO
xdischarge, and adopt the tail gas of lean-burn catalyst 1 pair of motor to process, and EGR valve 3 is according to different regulating working conditions EGR rate.This system also comprises two cover fuel supply systems, and the main gaseous fuel of main gaseous fuel storage tank 13 regulates its jet pressure according to the requirement of motor by pressure regulator valve 11, and regulates the injection pulse width of main gaseous fuel by solenoid valve 9; Working principle and the main gaseous fuel of the fuel supply system of auxiliary gas fuel are similar, the auxiliary gas fuel of auxiliary gas fuel reservoir tank 14 regulates its jet pressure according to the requirement of motor by pressure regulator valve 12, and regulates the injection pulse width of auxiliary gas fuel by solenoid valve 10.
Fig. 2 is the two gaseous propellant engine longitudinal section of in-cylinder direct injection.With general point combustion engine unlike, the engine fuel injector used in the present invention is arranged in cylinder.Wherein, auxiliary gas fuel injector 19 is arranged in the central position of cylinder, main gaseous-fuel injector 23 is arranged in edge of combustion chamber, spark plug 20 is near the nozzle of auxiliary gas fuel injector 19, the mode that auxiliary gas fuel is guided by spray bundle forms mixed gas, namely auxiliary gas fuel sprays into cylinder in compression stroke, fuel can directly spray to spark plug 19, denseer mixed gas is formed near spark plug 19, and certain concentration gradient can be formed, contribute to the stratified mixture combustion of mixed gas, what add injection is gaseous fuel, pilot fuel injector 19 and spark plug 20 can be avoided to form carbon distribution, and main gaseous fuel forms mixed gas by the mode that wall guides, due to the special shape of piston top surface, the interaction of main gaseous fuel and combustion chamber wall surface forms inflammable mixture, and in cylinder eddy current, roll stream effect under be directed into spark plug.
Fig. 3 is the two gaseous propellant engine egr system schematic diagram of mechanism of in-cylinder direct injection.By with the addition of a conduit 24 in intake duct, this conduit is outside intake duct 17, keep parallel with air flue profile streamline, and make catheter tip be deep near intake valve, to stop the too early blending of air and waste gas as much as possible, waste gas and the layering of air inlet in cylinder can be realized like this, waste gas is controlled near cylinder wall surface, inflammable mixture is distributed in zone line, ensures the impact not by waste gas near time of ignition spark plug, at reduction NO
xwhile discharge, also reduce the heat transfer loss of motor.
Fig. 4 is the two gaseous propellant engine control strategy figure of in-cylinder direct injection.ECU is by receiving each temperature and pressure transmitter signal of motor, tach signal, load signal, oxygen sensor signal, knock sensor signal etc., control the solenoid valve of main gaseous fuel, the solenoid valve of auxiliary gas fuel and EGR valve, by regulating the solenoid valve of main gaseous fuel, the start-up time of the solenoid valve of auxiliary gas fuel, the generation type of mixed gas can be regulated, and the electromagnetic valve for adjusting opening time can control its injection pulse width, because this motor is the quality regulate of load, so regulate the air fuel ratio of motor with this, motor can be run under each operating mode under the air fuel ratio of optimum, by regulating the aperture of EGR valve to change EGR rate, under corresponding operating mode, make engine operation best.
Claims (5)
1. the internal-combustion engine of the two gaseous fuel of in-cylinder direct injection under an EGR condition, it is characterized in that, it is converted by spark-ignition engine, and its concrete structure is made up of spark-ignition engine (25), air-strainer (4), exhaust-gas turbocharger (5), intercooler (6), EGR valve (3), lambda sensor (2), lean-burn catalyst (1), its fuel supply system is made up of main gaskraftstoffzufuhranlage and auxiliary fuel supply-system, main gaskraftstoffzufuhranlage is by main gaseous fuel storage tank (13), pressure regulator valve (11), solenoid valve (9) and main gaseous fuel delivery line (8) composition, auxiliary gas fuel supply system is by auxiliary gas fuel reservoir tank (14), pressure regulator valve (12), solenoid valve (10) and auxiliary gas fuel pump deliver line (7) composition, main gaseous fuel and auxiliary gas fuel are respectively by main gaseous-fuel injector (23), auxiliary gas fuel injector (19) direct cylinder injection, ECU is by receiving engine speed, load signal thus realize control to main gaseous-fuel injector (23), auxiliary gas fuel injector (19), spark plug (20), EGR valve (3).
2. the internal-combustion engine of the two gaseous fuel of in-cylinder direct injection under a kind of EGR condition according to claim 1, it is characterized in that, which eliminate closure, main gaseous fuel and auxiliary gas fuel all directly spray in cylinder, achieve the quality regulate of engine load, thus its thermal efficiency is compared spark-ignition engine and has been had and significantly improve.
3. the internal-combustion engine of the two gaseous fuel of in-cylinder direct injection under a kind of EGR condition according to claim 1, it is characterized in that, auxiliary gas fuel is compared to main gaseous fuel, its flame propagation speed, ignition energy are low, quenching distance is short, and the boundary of catching fire of auxiliary gas fuel is wide, but its volume energy density is lower than main gaseous fuel.
4. the internal-combustion engine of the two gaseous fuel of in-cylinder direct injection under a kind of EGR condition according to claim 1, it is characterized in that, an air pipe (24) is added in intake duct, this air pipe is outside intake duct, and keep parallel with air flue profile streamline, waste gas is made to enter cylinder by air pipe, thus realize waste gas and the layering of air inlet in cylinder, by air motion, waste gas is controlled near cylinder wall surface, inflammable mixture is distributed in zone line, ensures the impact not by exhaust gas concentration near time of ignition spark plug.
5. the internal-combustion engine of the two gaseous fuel of in-cylinder direct injection under a kind of EGR condition according to claim 1, it is characterized in that, auxiliary gas fuel injector (19) is arranged in the central position of cylinder, spark plug (20) is near auxiliary gas fuel injector nozzle, and main gaseous-fuel injector (23) is arranged in edge of combustion chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520503603.3U CN204961094U (en) | 2015-07-13 | 2015-07-13 | Two gaseous fuel's of direct injection internal -combustion engine under EGR condition |
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| CN201520503603.3U CN204961094U (en) | 2015-07-13 | 2015-07-13 | Two gaseous fuel's of direct injection internal -combustion engine under EGR condition |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989539A (en) * | 2015-07-13 | 2015-10-21 | 吉林大学 | Internal combustion engine for direct injection of double-gas fuel in cylinder under EGR condition and control method |
| CN109386403A (en) * | 2018-09-29 | 2019-02-26 | 哈尔滨工程大学 | It is a kind of for have twin-inlet gas, dual fuel engine bivalve type fuel gas ejecting device and its control method |
| WO2020057866A1 (en) * | 2018-09-19 | 2020-03-26 | Keyou GmbH | Method for operating an internal combustion engine, in particular a gas engine |
-
2015
- 2015-07-13 CN CN201520503603.3U patent/CN204961094U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989539A (en) * | 2015-07-13 | 2015-10-21 | 吉林大学 | Internal combustion engine for direct injection of double-gas fuel in cylinder under EGR condition and control method |
| WO2020057866A1 (en) * | 2018-09-19 | 2020-03-26 | Keyou GmbH | Method for operating an internal combustion engine, in particular a gas engine |
| US11649778B2 (en) | 2018-09-19 | 2023-05-16 | Keyou GmbH | Method for operating an internal combustion engine, in particular a gas engine |
| CN109386403A (en) * | 2018-09-29 | 2019-02-26 | 哈尔滨工程大学 | It is a kind of for have twin-inlet gas, dual fuel engine bivalve type fuel gas ejecting device and its control method |
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Granted publication date: 20160113 Termination date: 20170713 |