CN104454190B - Intra-cylinder direct injection double gas fuel ignition type combustion and control device - Google Patents

Intra-cylinder direct injection double gas fuel ignition type combustion and control device Download PDF

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Publication number
CN104454190B
CN104454190B CN201410620560.7A CN201410620560A CN104454190B CN 104454190 B CN104454190 B CN 104454190B CN 201410620560 A CN201410620560 A CN 201410620560A CN 104454190 B CN104454190 B CN 104454190B
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China
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fuel
engine
cylinder
double
cylinder direct
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CN201410620560.7A
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Chinese (zh)
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CN104454190A (en
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于秀敏
杜耀东
姜麟麟
李润增
孙平
董伟
何玲
顾家旗
李国良
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吉林大学
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Technologies for the improvement of indicated efficiency of a conventional ICE
    • Y02T10/121Adding non fuel substances or small quantities of secondary fuel to fuel, air or fuel/air mixture

Abstract

The invention relates to an intra-cylinder direct injection double gas fuel ignition type combustion and control device. Two gas fuel storage tanks are connected with respective spraying nozzles through pressure reducing valves respectively, and two kinds of fuel adopt an engine intra-cylinder direct injection mode, so that the combustion device has all the advantages of an intra-cylinder direct injection ignition type engine. In addition, a throttle valve of a traditional ignition type engine is omitted in the combustion device, pumping loss in the gas inlet process is reduced, an exhaust gas turbocharger is arranged, the inflation efficiency is improved, and the power per liter can be improved compared with a non-direct injection gas fuel engine. One fuel oil ejector in a cylinder is near a spark plug and matched with the special shape of a piston, and reliable ignition in a stroke partial thick area near the spark plug is guaranteed. The other fuel and the air form thin mixed gas, overall lean burn of the engine is realized, emission is reduced, petrol consumption is reduced, the pressure of petrol shortage is relieved, and environmental pollution is relieved.

Description

A kind of double gaseous fuel spark ignition type burnings of in-cylinder direct-jet and control device

Technical field

The present invention relates to Vehicular internal combustion engine technical field, and in particular to gas fuel engine is controlled and inner cylinder direct injection Engine.

Background technology

With the increase year by year of automobile pollution, the oil amount that automobile is consumed also increases year by year.In addition the generation verified Boundary stone oil amount of storage is constantly reduced, and the pernicious gas pollution on the environment discharged after automobile burning petroleum fuel is further serious And it is irreversible, so development of automobile is to energy-efficient requirement also more and more higher.With air pollution degree aggravation and Abgasgesetz it is increasingly strict, be that automobile finds the engine replacing fuel of high-quality and the exploration to engine new combustion mode It is imperative.The Engine Alternative Fuel of high-quality can mitigate automobile and give petroleum resources the pressure for bringing in short supply, mitigate energy Source crisis.The engine of new combustion pattern can reduce in theory the consumption of engine fuel, and harmful substance can be reduced again Discharge, while reduce energy consumption and reduce pollution purpose.Development of automobile must walk one with energy environment harmonious coexistence Sustainable Development Road.

In recent years, the gaseous propellant engine degree of receiving publicity is continuously increased, but traditional gaseous propellant engine has Certain shortcoming, gaseous fuel and air are entered in engine cylinder together, and gaseous fuel accounts for a part for charge volume so that enter Tolerance is reduced, and charging efficiency is reduced;The net energy metric density of gaseous fuel is less than petroleum fuel, and making the power drop of engine causes Power can not meet driving demand etc. during lean-burn.Based on asking that above-mentioned technical background and existing gaseous propellant engine are present Topic, dual fuel engine according to the present invention overcomes the shortcoming of existing gaseous propellant engine, and can realize various burnings Pattern, and the conversion between different combustion modes can be passed through, realize the burning of engine high-efficiency rate low emission.

In-cylinder direct-jet technology, refers to and atomizer is placed between inlet and exhaust valve, and high pressure fuel is directly noted people combustion chamber Smooth-going is efficiently burnt, and is realized by way of homogenous combustion and stratified combustion and is reached drop in the case where power output is ensured A kind of technology of low burn specific oil consumption, especially reduces the fuel consumption under Smaller load, while so that pinking is inclined to also significantly Decline, a kind of technology that dynamic property is but greatly improved.At present, the combustion system of in-cylinder direct fuel-injection engine mainly has two kinds, A kind of is the mode of stratified combustion, and another kind is the mode of homogeneous combustion.At home, the combustion system of in-cylinder direct fuel-injection engine is Homogeneous charge combustion mode, this is that requirement due to stratified combustion mode to oil quality is higher, when domestic oil product can not be allowed to long Between stable work, and be difficult to improve the quality of oil product at short notice, so the in-cylinder direct fuel-injection engine of the country is always Using homogeneous charge combustion mode.But the lean-burn of homogeneous charge combustion mode engine difficult to realize, and then limit engine economy Improve.

The content of the invention

The present invention is a kind of double gaseous fuel spark ignition type burners of in-cylinder direct-jet, it is therefore intended that solve traditional gas fuel The shortcoming that engine is present can not realize stratified combustion and the unmanageable problem of combustion product with domestic in-cylinder direct fuel-injection engine. The present invention can also make engine burn under bigger air-fuel ratio, work under higher compression ratio.By control system, make Engine is worked under different operating modes with different combustion modes, makes engine that optimum burning can be corresponded under various operating modes Pattern, the stable, efficient operation under optimization model.

The above-mentioned purpose of the present invention is achieved through the following technical solutions, and combines accompanying drawing and make and illustrate.

Refering to shown in Fig. 1, the present invention is a kind of double gaseous fuel layering burn devices of in-cylinder direct-jet, by engine 1, supercharging Device 4, double fuel storage tank 2 and 3, three way catalytic converter 6, electronic-controlled installation 5 etc. are constituted.Engine is by gas handling system, row Gas system, double gaskraftstoffzufuhranlages, cooling system, lubricating system, ignition system etc. are constituted.Dual fuel supply system is by firing Material storage tank 2 and 3, gas fuel pipe, gaseous fuel decompressor 7 and 10, high pressure gas rail 17 and 18, gas fuel nozzle 9 Constitute with 12, gaseous fuel leakage warning device 20 and 21 etc., gaseous fuel storage tank 2,3 is connected with respective nozzle 9,12, Each nozzle is directly injected fuel in engine cylinder.Engine supercharger 4 is connected with waste pipe 15, to starting The air inlet of machine is pressurized.Egr system is connected with waste pipe and air inlet pipe, tail gas is entered with air and is pressurized Device.Electronic-controlled installation 5 receives the various operating parameter signals of engine, specifically includes:Accelerator pedal position signal, engine Tach signal, crankshaft-position signal, camshaft-position signal, lubrication pressure force signal, lubricating oil temperature signal, cooling water temperature The concentration signal of oxygen, detonation signal, double fuel temperature and pressure signal, defeated in signal, intake air temperature and pressure signal, waste gas Go out the devices such as nozzle, spark plug, booster, the EGR valve of end control dual fuel engine.Gaseous fuel is simultaneously in above-mentioned double fuel tank Nonspecific two kinds of fuel, the flame propagation velocity of the gaseous fuel A (auxiliary fuel) is higher than fuel B (main fuel), igniting Energy will be less than the ignition energy of fuel B, while the octane number of fuel A will height.Have that fuel B's is pungent to the major requirement of fuel B Alkane value is high, and the net energy metric density of fuel B is of a relatively high.

The present invention, a kind of double gas fuel combustions of in-cylinder direct-jet and control device, the engine in the device is spark ignition type Engine.It is an object of the invention to the stratified combustion and engine of realizing engine stably burn under bigger air-fuel ratio, After achieving lean combustion in engine, the pinking tendency of engine is reduced, and can moderately improve the compression ratio of engine so that the economy of engine Property is further enhanced.The compression ratio of engine is designed as 12 by us, higher than the compression ratio of conventional gasoline machine, can make to send out The thermal efficiency of motivation is improved;What is be worth mentioning in addition is a bit, present invention eliminates the air throttle of traditional spark-ignition engine, subtracts The pumping loss of engine, improves charging efficiency when having lacked sub-load.Domestic in-cylinder direct-jet gasoline engine only exists WOT under big load, and middle Smaller load air throttle is without standard-sized sheet, therefore, there is throttling in middle Smaller load in engine There is no restriction loss in loss, the present invention, intake efficiency is greatly improved under all operating modes of engine.The double combustions of engine Material adopts in-cylinder direct-jet, all advantages with direct fuel-injection engine.Double direct-injection systems of engine also pass through special design, The especially position cooperation and nozzle location and the piston-shaped cooperation of fuel A of the nozzle of fuel A and spark plug, using gas Stream guiding and wall guiding allow the mixing that the gaseous mixture that fuel A is formed with air is formed about being easy to light in spark plug Gas, i.e., be formed about the local rich mixture of fuel A and air in spark plug, makes it easy to light, so light by fuel B and The gaseous mixture that air is formed, makes engine smooth working.The special control of special design requirement, in the present invention, two kinds of fuel Inner cylinder direct injection, also to coordinate the igniting of spark, thus occur in that two time for spraying and a time of ignition, this three The control at individual moment is particularly important to the present invention.In order to control these three boundary conditions, the present invention is directed to these three sides The substantial amounts of emulation that boundary's condition is carried out, it is therefore intended that the optimal cooperation of three moment is searched out under different operating modes, different Implement optimum control under operating mode.And same emulation experiment is all done under each combustion mode, optimal control parameter is found out, To realize the control to engine.The double fuel supply of engine and dual-fuel in-cylinder direct-jet can make engine in the present invention The optimum combustion mode corresponding with this operating mode is realized in different operating modes:

1st, start and warming-up operating mode (A type combustion modes):Traditional engine need in start operating performance to engine compared with Dense gaseous mixture, so that engine reliable ground starts, but the incomplete combustion of start operating performance gaseous mixture, starting engine Fuel consumption and emission performance all becomes deterioration during operating mode, and the present invention has on startup and start operating performance compared with conventional engines Corresponding combustion mode is A type combustion modes, and concrete methods of realizing is:Engine is used alone fuel A, opens in suction stroke Begin to supply fuel A into cylinder, make to form fuel A and the more uniform gaseous mixture of air in cylinder, compression travel latter stage again to Cylinder injection fuel A, is allowed to be formed about the denseer gaseous mixture in local in spark plug.Due to the ignition energy of fuel A it is low, flame Spread speed is fast, and combustion duration is short, can at short notice make engine realize starting, and is rapidly completed the warm of engine Machine process.When engine cooling water temperature reaches engine work temperature, fuel B is gradually added, while reducing fuel A Supply, it is ensured that total thermal discharge of fuel keeps constant.Quality+the combustion of the calorific value * fuel A of the total thermal discharge=fuel A of fuel The quality of the calorific value * fuel B of material B.The excess air coefficient of fuel is gradually increased according to the control parameter for simulating, engine is made The idle running under larger air-fuel ratio.

2nd, small load condition (the few Type B combustion modes of many A):Fuel stratification in the present invention has two kinds, fuel A-air shape Into the gaseous mixture that formed of gaseous mixture and fuel B-air between layering and fuel B and air layering.Text is emphasized here Mentioned in layering without specified otherwise all referring to fuel B and air formation layering.During Smaller load, engine is made in layering Work under lean mode, the nozzle of fuel B starts to spray and implement multi-injection in compression stroke, and multi-injection coordinates gas stream Dynamic to form stratified mixtures, in close compression top center, the nozzle of fuel A is opened, and starts spray fuel A, at spark plug Fuel A and the relatively dense gaseous mixture of air are formed, spark plug sparking is allowed to light, and then light fuel B and air formed Weak mixture, makes normal working of engine.Due to the stratified combustion of engine, and due to the air layer near Engine Cylinder Wall The heat transfer loss of engine is reduced, the thermal efficiency of engine is improved.

3rd, high load working condition (many Type B combustion modes of few A):During big load, according to the signal of engine throttle pedal, throttle Pedal signal gradually increases last stable, and engine needs larger torque output.With the continuous increasing of engine torque demand Plus, fuel feed system is stepped up the big fuel B of net energy metric density, while reducing the supply of fuel A, is met with this and is started The demand of machine torque.Specific implementation method is that, in the case where engine torque demand is met, fuel B is just opened when air inlet starts Begin to spray, increase injection pulse width and injection pressure is allowed to form uniform denseer gaseous mixture with air, and gradually decrease fuel A's Supply, the air-fuel ratio that gaseous mixture is ensured in the process keeps constant.

4th, anxious accelerating mode (many A many Type B combustion modes):When engine needs anxious acceleration, big torque is not only needed Also need to high rotating speed.According to engine throttle pedal signal, engine throttle pedal signal instantaneously increases, and now to meet and send out The demand that motivation increases sharply to torque and rotating speed, the gaseous mixture for supply engine combustion period short, i.e. power gaseous mixture.Tool Body implementation is that the big fuel B of engine fuel supply system supply engine net energy metric density also needs to supply engine The fast fuel A of burning velocity, is as implementation, to realize high pressure in suction stroke spray fuel B and the big load of engine Increase fuel injection pulsewidth while injection, except for the difference that spray more fuel A when close top dead centre is compressed, make the combustion of gaseous mixture The burning cycle is most short, and the output torque and rotating speed for making engine increases sharply, and realizes the anxious acceleration of engine.

Description of the drawings

Fig. 1 is the double gas fuel combustions of in-cylinder direct-jet and control device integrated machine composition.

Fig. 2 is the double gas fuel combustions of in-cylinder direct-jet and control device cylinder cap cross sectional view.

Fig. 3 is the double gas fuel combustions of in-cylinder direct-jet and the control device Electronic Control power supply signal for receiving and the finger for sending Order.

Fig. 4 is the double gas fuel combustions of in-cylinder direct-jet and control device fuel injection schematic diagram.

Fig. 5 is the double gas fuel combustions of in-cylinder direct-jet and control device control flow chart.

In figure:1 engine body, 2 fuel A holding vessels, 3 fuel B holding vessels, 4 exhaust-driven turbo-charger exhaust-gas turbo chargers, 5 Electronic Controls Unit, 6 triple effect catalytic converters, 7 pressure-reducing valves, 8 pressure gauges, the nozzle of 9 fuel A, 10 pressure-reducing valves, 11 pressure gauges, 12 fuel B's Nozzle, 13 exhaust mains, 14EGR valves, 15 air inlet pipe, 16 spark plugs, 17 fuel B high pressure gas rails, 18 fuel A high pressure gas rails, 19 Battery, 20 fuel A leakage warning devices, 21 fuel B leakage warning devices

Below in conjunction with the accompanying drawings illustrated embodiment further illustrates the specific embodiment of the present invention.

Fig. 1 is a kind of double gaseous fuel spark ignition type burnings of in-cylinder direct-jet and control device, is stored up by engine body 1, fuel A Deposit tank 2, fuel B holding vessels 3, exhaust-driven turbo-charger exhaust-gas turbo charger 4, electronic control unit 5, triple effect catalytic converter 6, pressure-reducing valve 7, pressure Table 8, the nozzle 9 of fuel A, pressure-reducing valve 10, pressure gauge 11, the nozzle 12 of fuel B, exhaust main 13, EGR valve 14, air inlet pipe 15, Spark plug 16, fuel B high pressure gas rail 17, fuel A high pressure gas rail 18, battery 19, fuel A leakage warning devices 20, fuel B are let out Fail to report the grade of alarm device 21 composition.Gaseous fuel A is connected through pressure-reducing valve 7, pressure gauge 8 with the high pressure gas rail 9 of fuel A, high pressure gas Rail connects the nozzle of fuel A, and fuel B is connected through pressure-reducing valve 10, pressure gauge 11 with the high pressure gas rail 17 of fuel B, the height of fuel B Rail 17 of calming the anger is connected with the nozzle 12 of fuel B.Two nozzles are all directly injected fuel in engine cylinder, constitute the combustion of the invention Material feed system.Fuel feed system also includes the alarm 20,21 for fuel leakage.The exhaust main 13 of engine and increasing Depressor 4 is connected, and the air inlet to engine is pressurized, and constitutes the pressure charging system of the device.EGR valve 14 connects the row of engine Tracheae 13 and air inlet pipe 15, constitute the egr system of the device.Triple effect catalytic converter 6 is connected with engine exhaust manifold 13, peace The rear of booster 4 is mounted in, motor exhaust is processed, constitute the after-treatment system of repacking.

Fig. 2 is the double gas fuel combustions of in-cylinder direct-jet and control device cylinder cap cross sectional view, can be seen that fuel A's from figure The nozzle 12 and spark plug 16 position projection in the horizontal plane of nozzle 9, fuel B, coordinates Fig. 4 to can determine the sky of three parts Between position relationship.May determine that whether the mechanical strength of engine cylinder cover meets accordingly by finite element analysis and theoretical calculation to want Ask.

Fig. 3 is the electronic control unit signal transacting situation of engine, and receiving terminal receives engine operation condition signal:Oil Door pedal position signal, engine rotational speed signal, corner signal, top dead center position signal, lubrication pressure force signal, lubrication It is the concentration signal of oxygen in oil temperature signal, cooling water temperature signal, intake air temperature and pressure signal, waste gas, detonation signal, double Fuel temperature and pressure signal.Output end is connected with fuel A nozzles 9, fuel B nozzles 12 and spark plug 16, sends out to actuator Go out instruction, realize dual-fuel injection and the arcing of spark plug.

Fig. 4 is the double gas fuel combustions of in-cylinder direct-jet and control device, double fuel is realized in the cylinder of engine directly Injection, the position of fuel injector and spark plug to fuel A, B designed, and the nozzle 9 of fuel A and cylinder-bore axis are into 35 Degree angle, into 50 degree angles, spark plug 16 and cylinder-bore axis are into 25 degree of angles, and top land for the nozzle 12 of fuel B and cylinder-bore axis There is the pit of fit with nozzle, the gaseous mixture for alloing fuel A to be formed about lighting in spark plug makes fuel B in part work Condition can form stratified mixtures.The invention is a kind of gas double fuel layering burn device, so eliminating conventional gasoline machine Air throttle, compared with traditional layering lean-combustion engine, not only in big load reduce engine restriction loss, starting The full working scope of machine operation can reduce the restriction loss of engine, increase air inflow, reduce engine heat transfer loss, make engine Fuel economy further improved.Can be operated under bigger compression ratio after achieving lean combustion in engine, so this The compression ratio of motivation is designed as 12, so that the thermal efficiency of engine is further improved.

If Fig. 5 is the double gas fuel combustions of in-cylinder direct-jet and control device control flow chart, engine operating first has to root The operation mode of engine is judged according to the operating parameters (mainly accelerator pedal position signal) of Engine ECU reception, according to The different operation modes of engine carry out different controls to engine, select the combustion mode of engine, it is ensured that engine is obtained To control in real time.Ensure that motor torque output valve meets torque-demand, and then it is relatively optimum in real time to realize engine Control, make engine economy, dynamic property, emission performance all reach it is relatively excellent.Each Operation Conditions of engine are right The arteries and veins spectrum that should have been emulated accordingly, finds and the immediate control parameter of engine current operating state from arteries and veins spectrum, enters And engine is controlled.It is embodied as route:The operating parameters of engine judge the Operation Conditions of engine --- with work The corresponding combustion mode of condition --- the relative optimum control to the combustion mode.

Claims (5)

1. a kind of double gaseous fuel spark ignition type burning of in-cylinder direct-jet and control device, it is characterised in that it be by engine (1), Exhaust-driven turbo-charger exhaust-gas turbo charger (4), double fuel storage tank (2) (3), three way catalytic converter (6), EGR valve (14), electronic-controlled installation (5) constitute;Double fuel storage tank (2) (3) is connected respectively through pressure-reducing valve (7) (10) with respective nozzle (9) (12), two kinds of combustions Using the in-cylinder direct-jet of engine, exhaust-driven turbo-charger exhaust-gas turbo charger (4) is connected material with waste pipe (13), to engine Air inlet is pressurized;EGR valve (14) is connected with waste pipe (13) and air inlet pipe (15), and waste gas is with fresh air Into exhaust-driven turbo-charger exhaust-gas turbo charger (4), electronic-controlled installation (5) receives the various CRANK PULSES of engine, and control double fuel starts The devices such as nozzle (9) (12), spark plug (16), exhaust-driven turbo-charger exhaust-gas turbo charger (4), the EGR valve (14) of machine, also eliminate tradition and light The air throttle of formula engine, reduces the restriction loss of engine, improves charging efficiency;Nozzle and spark plug to fuel A, B Position designed, the nozzle (9) of fuel A is with cylinder-bore axis into 35 degree of angles, the nozzle (12) of fuel B and cylinder-bore axis Into 50 degree of angles, with cylinder-bore axis into 25 degree of angles, and top land has the pit of fit with nozzle to spark plug (16).
2. a kind of double gaseous fuel spark ignition types of in-cylinder direct-jet according to claim 1 burn and control device, and its feature exists In fuel and nonspecific two kinds of fuel in above-mentioned double fuel storage tank, the flame propagation velocity of described fuel A is higher than fuel The ignition energy of B, fuel A will be less than the ignition energy of fuel B, and the octane number of fuel A will height;The octane number of described fuel B High, the net energy metric density of fuel B will height.
3. a kind of double gaseous fuel spark ignition types of in-cylinder direct-jet according to claim 1 burn and control device, and its feature exists In two kinds of fuel realize the time for spraying of fuel A, the time for spraying of fuel B, igniting using the direct injection in cylinder Profile error of these three moment at moment under Different Work Condition of Engine.
4. a kind of double gaseous fuel spark ignition types of in-cylinder direct-jet according to claim 1 burn and control device, and its feature exists In, a kind of nozzle of fuel coordinates the special shape of piston near spark plug, and in spark plug localized rich area is formed about, with Realize reliable igniting;Another kind of fuel forms diluter gaseous mixture with air, realizes the overall lean-burn of engine, many to realize Plant the conversion of combustion mode.
5. a kind of double gaseous fuel spark ignition types of in-cylinder direct-jet according to claim 1 burn and control device, and its feature exists In, the compression ratio of engine is designed as into 12, more slightly higher than the compression ratio of conventional gasoline machine, the engine is that gas lean-burn starts Machine, pinking tendency reduces, and the compression ratio for improving engine is conducive to improving the dynamic property of engine and further improves engine Economy.
CN201410620560.7A 2014-11-04 2014-11-04 Intra-cylinder direct injection double gas fuel ignition type combustion and control device CN104454190B (en)

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CN104748968A (en) * 2015-04-01 2015-07-01 西北工业大学 Polluting experiment gas adding device
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
CN104963778A (en) * 2015-07-13 2015-10-07 吉林大学 Waste gas dilution dual fuel engine equivalent ratio burning system and method
CN105114174A (en) * 2015-09-16 2015-12-02 吉林大学 Lean-burn gas duel-fuel spark-ignition-type internal combustion engine based on EGR system and control method
CN106499531B (en) * 2016-10-16 2019-05-03 北京工业大学 A kind of twin-jet nozzle gas/liquid double fuel in-cylinder direct-jet internal combustion engine and control method

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JP3681041B2 (en) * 1999-02-16 2005-08-10 三菱電機株式会社 In-cylinder injection internal combustion engine control device
JP2003106187A (en) * 2001-09-28 2003-04-09 Mazda Motor Corp Control system for spark ignition type direct injection engine
CN2585985Y (en) * 2002-12-05 2003-11-12 天津大学 Dimethyl ether/gas double-fuel engine
US7128063B2 (en) * 2004-07-21 2006-10-31 Gm Global Technology Operations, Inc. HCCI engine combustion control
CN102278189B (en) * 2011-04-28 2012-11-28 上海交通大学 Direct injection engine with diesel-gasoline dual-fuel sequence combustion
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CN204299708U (en) * 2014-11-04 2015-04-29 吉林大学 The two gaseous fuel Spark ignition type burning of a kind of in-cylinder direct injection and control gear

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