CN105673281B - In a kind of gas/liquid double fuel cylinder/cylinder outer pair of injection apparatus and control method - Google Patents

In a kind of gas/liquid double fuel cylinder/cylinder outer pair of injection apparatus and control method Download PDF

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Publication number
CN105673281B
CN105673281B CN201610219340.2A CN201610219340A CN105673281B CN 105673281 B CN105673281 B CN 105673281B CN 201610219340 A CN201610219340 A CN 201610219340A CN 105673281 B CN105673281 B CN 105673281B
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fuel
cylinder
liquid
gas
air
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CN105673281A (en
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纪常伟
从骁宇
汪硕峰
张擘
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Beijing University of Technology
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Beijing University of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

In a kind of gas/liquid double fuel cylinder/the outer double injection apparatus of cylinder and control method belong to internal combustion engine control field, and in particular in a kind of gas/liquid double fuel distribution feed system, gas/liquid double fuel cylinder/the outer double injections of cylinder and Combustion Process Control device.The device using a set of fuel distribution feed system for the distribution supply of gas/liquid double fuel and it is a set of in gas/liquid double fuel cylinder/the spray combustion electronic control unit of the outer double injections of cylinder and Combustion Process Control.Spray combustion electronic control unit can be according to internal combustion engine operation working condition, by fuel distribute feed system adjustment spray into cylinder in/cylinder outside fuel injection species, reduce internal combustion engine heat transfer loss and pumping loss, improve fuel combustion, and then realize while combustion engine powered performance is ensured, its fuel consumption and pollutant emission are reduced, to realize the effect of energy-saving and emission-reduction.

Description

In a kind of gas/liquid double fuel cylinder/cylinder outer pair of injection apparatus and control method
Technical field
The present invention provides in a kind of gas/liquid double fuel cylinder for ignition internal combustion engine/cylinder outer pair of injection apparatus and control Method, and in particular in a kind of gas/liquid double fuel distribution feed system, gas/liquid double fuel cylinder/cylinder outer pair of injection and combustion process Control device, belongs to internal combustion engine control field.
Background technology
The single position injection ignition internal combustion engine of existing single-fuel is burnt using equivalent proportion condition, fuel consumption greatly, Pollutant emission is high；In addition, although the liquid fuel net energy such as gasoline, diesel oil, methanol metric density is high, burning needs atomization process And there are liquefaction phenomenon, fuel oil consumption was not only added, but also improve pollutant emission；And natural gas, liquefied petroleum gas, hydrogen Although being not required gasification that liquefaction phenomenon is not present Deng gaseous fuel, net energy metric density is low, makes under combustion engine powered performance Drop, and gaseous fuel sprays in cylinder external admission road and takes admission space, influences the efficiency of internal combustion engine.
In-cylinder direct-jet technology, refers to and atomizer is installed in combustion chamber, injects fuel directly into in-cylinder combustion.Liquid fuel Lean mode can be used to burn with reference to the technology, reduce fuel consumption, simultaneously because injection pressure improves, be conducive to fuel Atomization, but the relatively narrow lean flammability limit of liquid fuel is limited to, the reduction effect of fuel consumption is limited, just outer to also add particle The discharge of the pollutant such as thing and nitrogen oxides；Gaseous fuel combines the technology and can effectively solve in fuel occupancy admission space influence The problem of combustion engine efficiency, but the influence of its relatively low internal combustion engine power performance of net energy metric density can not still solve.
By being sprayed outside liquid fuel cylinder injection, gaseous fuel cylinder, can be widened by the premix of gaseous fuel and air The lean flammability limit of liquid fuel and air inlet gaseous mixture, realizes the fuel consumption of smaller in cylinder, while may additionally facilitate mixing in cylinder The burning of gas, reduces cylinder temperature, while reducing internal combustion engine radiation loss, lifting its thermal efficiency, reduces particulate matter and nitrogen Oxide etc. discharges, in addition, can also coordinate larger throttle opening, reduces pumping loss, lifts internal combustion engine thermal efficiency；Pass through Sprayed outside gaseous fuel cylinder injection, liquid fuel cylinder, gaseous fuel can avoided to take admission space, influence internal combustion engine inflation While efficiency, coordinate larger throttle opening, reduce pumping loss, realize the purpose for improving internal combustion engine thermal efficiency.Therefore, Using in gas/liquid double fuel cylinder/cylinder outside the spray combustion modes of double injections can ensure combustion engine powered performance with control method While, fuel consumption and pollutant emission are reduced, realizes the effect of energy-saving and emission-reduction.
The content of the invention
Asked for the single position injection spark ignition type automotive fuel consumption of existing single-fuel is big, pollutant emission is high Topic, the present invention provides a kind of double injection ignition internal combustion engines of gas/liquid double fuel and control method.The present invention uses cylinder injection Two kinds of jet modes of injecting LPG in liquefied condition matches somebody with somebody outside the outer gas injection fuel of liquid fuel, cylinder and cylinder injection gaseous fuel, cylinder Close and use, cylinder fuel is burnt in broader lean flammability limit section, realize while combustion engine powered performance is ensured, reduce Fuel consumption and the purpose of pollutant emission.
To achieve the above object, present invention employs following technical solution：
In a kind of gas/liquid double fuel cylinder/the outer double injection apparatus of cylinder, it is characterised in that：Fuel distribution feed system includes gas Fluid fuel holder (11), liquid fuel reservoir (12), the gaseous fuel pump being connected with gaseous fuel holder (11) (10), the liquid fuel feed pump (13) and gaseous fuel pump (10) and liquid fuel feed pump being connected with liquid fuel reservoir (12) (13) be connected be used to adjust sprayed into cylinder/the gas/liquid double fuel distributor (9) of cylinder outer fuel species, by inlet valve cam The shaft-driven pressurized fuel pump (8) being connected with gas/liquid double fuel distributor (9) and cylinder fuel nozzle (4) and pressurization are fired Material pump (8) be connected be located at cylinder cap in be passed through combustion chamber cylinder fuel nozzle (4) and with gas/liquid double fuel distributor (9) what is be connected is located at the cylinder outer fuel nozzle (5) that air intake duct (6) is passed through in inlet manifold；The core of spray combustion electric control gear Center portion part includes spray combustion electronic control unit (1)；
The spray combustion electronic control unit (1) by integral engine control sensor obtain actual speed signal (f), in cylinder/cylinder Outer fuel injection pressure signal (g), and for carrying out spray combustion control；
The spray combustion electronic control unit (1) is connected with gas/liquid double fuel distributor (9), and passes through the double combustions of gas/liquid Expect distributor control signal (a) adjustment fuel spray into cylinder in/cylinder outside fuel injection species；
The spray combustion electronic control unit (1) is connected with air throttle (7), and is adjusted by throttle control signal (b) The aperture of whole air throttle (7)；
The spray combustion electronic control unit (1) is connected with cylinder outer fuel nozzle (5), and passes through cylinder outer fuel nozzle control The time for spraying and injection pulse width of signal (c) master cylinder outer fuel injection processed；
The spray combustion electronic control unit (1) is connected with cylinder fuel nozzle (4), and passes through cylinder fuel nozzle control The time for spraying and injection pulse width of signal (d) master cylinder fuel injection processed；
The spray combustion electronic control unit (1) is connected by ignition module (2) with spark plug (3), and passes through igniting Control signal (e) controls the angle of ignition.
Gaseous fuel includes hydrogen, natural gas, liquefied petroleum gas or dimethyl ether；Liquid fuel includes gasoline, methanol or second Alcohol.
Using the method for described device, it is characterised in that：
Jet mode one：Cylinder injection liquid fuel, the outer gas injection fuel of cylinder；Under the jet mode, spray combustion Electronic control unit (1) controls gas/liquid double fuel distributor (9) by gas/liquid double fuel distributor control signal (a), fires liquid Liquid fuel in material holder (12) passes to pressurized fuel pump (8) after liquid fuel feed pump (13) pressurization to be continued to be forced into More than 10MPa, while the gaseous fuel in gaseous fuel holder (11) is passed to cylinder after gaseous fuel pump (10) pressurization Outer fuel nozzle (5)；In by cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), gaseous fuel sprayed into Combustion engine air intake duct (6)；Control cylinder fuel nozzle (4) that pressurized fuel will be passed through by cylinder fuel Jet control signal (d) to pump (8) high pressure liquid fuel of pressurization sprays into combustion chamber；Ignition module (2) is controlled to drive spark plug by ignition control signal (e) (3) light a fire；
Jet mode two：Cylinder injection gaseous fuel, the outer injecting LPG in liquefied condition of cylinder；Under the jet mode, spray combustion Electronic control unit (1) controls gas/liquid double fuel distributor (9) by gas/liquid double fuel distributor control signal (a), fires gas Gaseous fuel in material holder (11) passes to pressurized fuel pump (8) after gaseous fuel pump (10) pressurization to be continued to be forced into More than 10MPa, while the liquid fuel in liquid fuel reservoir (12) is passed to cylinder after liquid fuel feed pump (13) pressurization Outer fuel nozzle (5)；In by cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), liquid fuel sprayed into Combustion engine air intake duct (6)；Control cylinder fuel nozzle (4) that pressurized fuel will be passed through by cylinder fuel Jet control signal (d) to pump (8) pressurized fuel gas of pressurization sprays into combustion chamber；Ignition module (2) is controlled to drive spark plug by ignition control signal (e) (3) light a fire.
Spray combustion electronic control unit (1) controls gas/liquid double fuel point by gas/liquid double fuel distributor control signal (a) Orchestration (9), uses jet mode one；Increase 20% by throttle control signal (b) throttle valve (7) aperture；According to formula AFL=(Vair×ρair)/mL, the injection pulse width of cylinder fuel nozzle (4) is controlled by cylinder fuel Jet control signal (d), is adjusted Whole liquid fuel jet quality mL, liquid fuel is in lean burn burning, lean burn AFlThe ＞ fuel theoretical values, AFL=μ × AFL, 8, AFLFor liquid fuel actual mixing ratio, VairFor volume of air, ρairFor atmospheric density, mLFor liquid fuel Jet quality, μ are liquid fuel lean-burn coefficient, AFL, SFor liquid fuel chemically correct fuel；At the same time according to formula α=VG/(VG+ Vair) pass through the injection pulse width of cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), adjustment gaseous fuel injection Volume VG, gaseous fuel is accounted for total air inflow volume fraction α and be maintained between 0.25~0.35, and make gaseous fuel and air Enter after IC engine cylinder external admission road (6) premix in cylinder, in formula, α accounts for total air inflow volume fraction, V for gaseous fuelGFor gas Fluid fuel spray injection volume, VairFor volume of air.
Spray combustion electronic control unit (1) controls gas/liquid double fuel point by gas/liquid double fuel distributor control signal (a) Orchestration (9), uses the jet mode two；The injection pulse width and air throttle (7) aperture of holding cylinder outer fuel nozzle (5) are not Become, according to formula AFG-(Vair×ρair)/(VG×ρG) pass through cylinder fuel Jet control signal (d) adjustment cylinder fuel nozzle (4) injection pulse width, adjustment gaseous fuel injection volume VG, and then by controlling gaseous fuel actual mixing ratio AFG, make internal combustion Machine actual speed stabilization is in 750 ± 50rpm, formula, AFGFor gaseous fuel actual mixing ratio, VairFor volume of air, ρairFor Atmospheric density, VGVolume, ρ are sprayed for gaseous fuelGFor gaseous fuel density.
Spray combustion electronic control unit (1) controls gas/liquid double fuel point by gas/liquid double fuel distributor control signal (a) Orchestration (9), uses jet mode one；It is shown in a fully open operation by throttle control signal (b) throttle valve (7), by cylinder Fuel nozzle control signal (d) and cylinder outer fuel nozzle control signal (c) control the injection pulse width of cylinder fuel nozzle (4) respectively And the injection pulse width of cylinder outer fuel nozzle (5), realize the adjustment of engine load conversion.
The beneficial effects of the invention are as follows：For the single position injection spark ignition type automotive fuel consumption of existing single-fuel Greatly, the problem of pollutant emission is high, using gaseous fuel be not required to the of a relatively high net energy metric density of gasification, liquid fuel with And fuel cylinder injection can realize the characteristics of lean burn, when making internal combustion engine using the operation of jet mode one, by gaseous fuel With premix of the air in cylinder external admission road, lean flammability limit of the liquid fuel in cylinder is widened, is realized combustion engine powered in guarantee On the premise of performance, the purpose of fuel consumption and pollutant emission is reduced, while also by sub-load throttle opening Increase, reduces internal combustion engine pumping loss, and then improves the thermal efficiency of internal combustion engine；When internal combustion engine is run using jet mode two, By the cylinder injection of gaseous fuel, solve the problems, such as that occupancy charging volume is sprayed outside gaseous fuel cylinder influences the thermal efficiency, together When improve the lean burn condition of gas in the jar fuel under larger throttle opening by being sprayed outside the cylinder of liquid fuel, realize By adjusting the purpose of gas in the jar fuel injection amount stable objects idling, the thermal efficiency of internal combustion engine is improved, reduces internal combustion The fuel consumption of machine and pollutant emission.
Brief description of the drawings
Fig. 1 is the structure and fundamental diagram of the present invention
In figure：1 internal combustion engine electronic-control unit；2 ignition modules；3 spark plugs；4 cylinder fuel nozzles；5 cylinder outer fuels spray Mouth；6 internal combustion engine inlets；7 air throttles；8 pressurized fuels pump；9 gas/liquid double fuel distributors；10 gaseous fuel pumps；11 gases fire Expect holder；12 liquid fuel reservoirs；13 liquid fuel feed pumps；
A. gas/liquid double fuel distributor control signal；B. throttle control signal；C. cylinder outer fuel nozzle control signal； D. cylinder fuel Jet control signal；E. ignition control signal；F. actual speed signal；In cylinder g./cylinder outer fuel injection pressure Signal.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
As shown in Figure 1, in a kind of gas/liquid double fuel cylinder for ignition internal combustion engine in the present embodiment/the outer double sprays of cylinder Injection device and control method, the device is using a set of fuel distribution feed system and one for the distribution supply of gas/liquid double fuel Set is used in gas/liquid double fuel cylinder/the spray combustion electronic control unit of the outer double injection of cylinder and Combustion Process Control.
It is characterized in that：Fuel distribution feed system include gaseous fuel holder (11), liquid fuel reservoir (12), The gaseous fuel pump (10) being connected with gaseous fuel holder (11), the liquid fuel feed pump being connected with liquid fuel reservoir (12) (13), be connected with gaseous fuel pump (10) and liquid fuel feed pump (13) be used to adjust sprays into cylinder/cylinder outer fuel species Gas/liquid double fuel distributor (9), by inlet camshaft driving and gas/liquid double fuel distributor (9) and cylinder fuel spray Pressurized fuel that mouth (4) is connected pump (8), being passed through in cylinder cap in the cylinder of combustion chamber of being connected with pressurized fuel pump (8) Fuel nozzle (4) and the cylinder that air intake duct (6) are passed through in inlet manifold being connected with gas/liquid double fuel distributor (9) Outer fuel nozzle (5)；The core component of spray combustion electric control gear includes spray combustion electronic control unit (1).
The spray combustion electronic control unit (1) by integral engine control sensor obtain actual speed signal (f), in cylinder/cylinder Outer fuel injection pressure signal (g), and for carrying out spray combustion control.
The spray combustion electronic control unit (1) is connected with gas/liquid double fuel distributor (9), and passes through the double combustions of gas/liquid Expect distributor control signal (a) adjustment fuel spray into cylinder in/cylinder outside fuel injection species；
The spray combustion electronic control unit (1) is connected with air throttle (7), and is adjusted by throttle control signal (b) The aperture of whole air throttle (7)；
The spray combustion electronic control unit (1) is connected with cylinder outer fuel nozzle (5), and passes through cylinder outer fuel nozzle control The time for spraying and injection pulse width of signal (c) master cylinder outer fuel injection processed；
The spray combustion electronic control unit (1) is connected with cylinder fuel nozzle (4), and passes through cylinder fuel nozzle control The time for spraying and injection pulse width of signal (d) master cylinder fuel injection processed；
The spray combustion electronic control unit (1) is connected by ignition module (2) with spark plug (3), and passes through igniting Control signal (e) controls the angle of ignition；
The gaseous fuel includes hydrogen, natural gas, liquefied petroleum gas or dimethyl ether；Liquid fuel includes gasoline, first Alcohol or ethanol.
In gas/liquid double fuel cylinder 1) jet mode and its control method of/outer double injection apparatus of cylinder, it is characterised in that：
Jet mode one：Cylinder injection liquid fuel, the outer gas injection fuel of cylinder.Under the jet mode, spray combustion Electronic control unit (1) controls gas/liquid double fuel distributor (9) by gas/liquid double fuel distributor control signal (a), fires liquid Liquid fuel in material holder (12) passes to pressurized fuel pump (8) after liquid fuel feed pump (13) pressurization to be continued to be forced into More than 10MPa, while the gaseous fuel in gaseous fuel holder (11) is passed to cylinder after gaseous fuel pump (10) pressurization Outer fuel nozzle (5)；In by cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), gaseous fuel sprayed into Combustion engine air intake duct (6)；Control cylinder fuel nozzle (4) that pressurized fuel will be passed through by cylinder fuel Jet control signal (d) to pump (8) high pressure liquid fuel of pressurization sprays into combustion chamber；Ignition module (2) is controlled to drive spark plug by ignition control signal (e) (3) light a fire；
Jet mode two：Cylinder injection gaseous fuel, the outer injecting LPG in liquefied condition of cylinder.Under the jet mode, spray combustion Electronic control unit (1) controls gas/liquid double fuel distributor (9) by gas/liquid double fuel distributor control signal (a), fires gas Gaseous fuel in material holder (11) passes to pressurized fuel pump (8) after gaseous fuel pump (10) pressurization to be continued to be forced into More than 10MPa, while the liquid fuel in liquid fuel reservoir (12) is passed to cylinder after liquid fuel feed pump (13) pressurization Outer fuel nozzle (5)；In by cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), liquid fuel sprayed into Combustion engine air intake duct (6)；Control cylinder fuel nozzle (4) that pressurized fuel will be passed through by cylinder fuel Jet control signal (d) to pump (8) pressurized fuel gas of pressurization sprays into combustion chamber；Ignition module (2) is controlled to drive spark plug by ignition control signal (e) (3) light a fire；
Spray combustion electronic control unit (1) controls gas/liquid double fuel point by gas/liquid double fuel distributor control signal (a) Orchestration (9), uses the jet mode one；Increase 20% by throttle control signal (b) throttle valve (7) aperture；Root According to formula AFL-(Vair×ρair)/mL, pass through the injection arteries and veins of cylinder fuel Jet control signal (d) control cylinder fuel nozzle (4) Width, adjustment liquid fuel jet quality mL, liquid fuel is in lean burn (AFL=μ × AFL, S) burn, in formula, AFLFor Liquid fuel actual mixing ratio, VairFor volume of air (m3), ρairFor atmospheric density (kg/m3), mLFor liquid fuel jet quality (kg), μ is liquid fuel lean-burn coefficient, AFL, SFor liquid fuel chemically correct fuel；At the same time according to formula α=VG/(VG+Vair) logical Cross the injection pulse width of cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), adjustment gaseous fuel injection volume VG, gaseous fuel is accounted for total air inflow volume fraction α and be maintained between 0.25~0.35, and make gaseous fuel with air in internal combustion Enter after machine cylinder external admission road (6) premix in cylinder, in formula, α accounts for total air inflow volume fraction, V for gaseous fuelGFor gaseous fuel Spray injection volume (m3), VairFor volume of air (m3)；
Spray combustion electronic control unit (1) controls gas/liquid double fuel point by gas/liquid double fuel distributor control signal (a) Orchestration (9), uses the jet mode two；The injection pulse width and air throttle (7) aperture of holding cylinder outer fuel nozzle (5) are not Become, according to formula AFG=(Vair×ρair)/(VG×ρG) pass through cylinder fuel Jet control signal (d) adjustment cylinder fuel nozzle (4) injection pulse width, adjustment gaseous fuel injection volume VG, and then by controlling gaseous fuel actual mixing ratio AFG, make internal combustion Machine actual speed stabilization is near internal combustion engine target idling speed (750 ± 50rpm), in formula, AFGFor the actual air-fuel of gaseous fuel Than VairFor volume of air (m3), ρairFor atmospheric density (kg/m2), VGVolume (m is sprayed for gaseous fuel3), ρGFor gaseous fuel Density (kg/m3)；
Spray combustion electronic control unit (1) controls gas/liquid double fuel point by gas/liquid double fuel distributor control signal (a) Orchestration (9), uses jet mode one；It is shown in a fully open operation by throttle control signal (b) throttle valve (7), by cylinder Fuel nozzle control signal (d) and cylinder outer fuel nozzle control signal (c) control the injection pulse width of cylinder fuel nozzle (4) respectively And the injection pulse width of cylinder outer fuel nozzle (5), realize the adjustment of engine load conversion.
The double injection ignition internal combustion engines of a 1.6L gas (hydrogen)/liquid (gasoline) double fuel are on internal combustion engine experimental stand Example verifies the actual effect of above device and control method, test result indicates that, and using fuel of the present invention distribution Gasoline engine before feed system, spray combustion control device and control strategy is compared, at the start internal combustion engine enter stable state when Between shorten 63.2%, needed for preceding 11s total amount of fuel reduce 31.2%；Fuel consumption during idling reduces 36.4%, not Fire hydrocarbon, carbon monoxide, discharged nitrous oxides and reduce 54.2%, 16.7%, 32.6% respectively；1400rpm load-characteristic tests In, fuel consumption averagely reduces by 32.7%.

Claims (2)

1. in a kind of gas/liquid double fuel cylinder/double injection apparatus, its structure are as follows outside for cylinder：Fuel distribution feed system includes gas Fuel reservoir (11), liquid fuel reservoir (12), the gaseous fuel pump (10) being connected with gaseous fuel holder (11), with The liquid fuel feed pump (13) of liquid fuel reservoir (12) connection, be connected with gaseous fuel pump (10) and liquid fuel feed pump (13) Be used to adjust spray into cylinder/the gas/liquid double fuel distributor (9) of cylinder outer fuel species, by inlet camshaft driving with The pressurized fuel that gas/liquid double fuel distributor (9) and cylinder fuel nozzle (4) are connected pumps (8), pumps (8) phase with pressurized fuel Connection is located at what is be passed through the cylinder fuel nozzle (4) of combustion chamber in cylinder cap and be connected with gas/liquid double fuel distributor (9) The cylinder outer fuel nozzle (5) of air intake duct (6) is passed through in inlet manifold；The core component of spray combustion electric control gear includes spray Penetrate burning electronic control unit (1)；
The spray combustion electronic control unit (1) by integral engine control sensor obtain actual speed signal (f), in cylinder/cylinder external combustion Material injection pressure signal (g), and for carrying out spray combustion control；
The spray combustion electronic control unit (1) is connected with gas/liquid double fuel distributor (9), and passes through gas/liquid double fuel point Orchestration control signal (a) adjustment fuel spray into cylinder in/cylinder outside fuel injection species；
The spray combustion electronic control unit (1) is connected with air throttle (7), and is adjusted and saved by throttle control signal (b) The aperture of valve (7)；
The spray combustion electronic control unit (1) is connected with cylinder outer fuel nozzle (5), and is controlled and believed by cylinder outer fuel nozzle The time for spraying and injection pulse width of number (c) master cylinder outer fuel injection；
The spray combustion electronic control unit (1) is connected with cylinder fuel nozzle (4), and is believed by cylinder fuel Jet control The time for spraying and injection pulse width of number (d) master cylinder fuel injection；
The spray combustion electronic control unit (1) is connected by ignition module (2) with spark plug (3), and passes through ignition control Signal (e) controls the angle of ignition；
It is characterized in that：
Cylinder injection liquid fuel, the outer gas injection fuel of cylinder；Under the jet mode, spray combustion electronic control unit (1) passes through Gas/liquid double fuel distributor control signal (a) control gas/liquid double fuel distributor (9), makes in liquid fuel reservoir (12) Liquid fuel passes to pressurized fuel pump (8) after liquid fuel feed pump (13) pressurization to be continued to be forced into more than 10MPa, while makes gas Gaseous fuel in fluid fuel holder (11) passes to cylinder outer fuel nozzle (5) after gaseous fuel pump (10) pressurization；Pass through Gaseous fuel is sprayed into internal combustion engine inlet (6) by cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5)；Pass through Cylinder fuel Jet control signal (d) control cylinder fuel nozzle (4) will pass through the highly pressurised liquid combustion of pressurized fuel pump (8) pressurization Material sprays into combustion chamber；Ignition module (2) is controlled to drive spark plug (3) to light a fire by ignition control signal (e)；
Spray combustion electronic control unit (1) controls gas/liquid double fuel distributor by gas/liquid double fuel distributor control signal (a) (9), 20% is increased by throttle control signal (b) throttle valve (7) aperture；According to formula AFL=(Vair×ρair)/mL, lead to The injection pulse width of cylinder fuel Jet control signal (d) control cylinder fuel nozzle (4) is crossed, adjusts liquid fuel jet quality mL, liquid fuel is in lean burn burning, lean burn AFLThe ＞ fuel theoretical values, AFL=μ × AFL, S, AFLFor liquid Fluid fuel actual mixing ratio, VairFor volume of air, ρairFor atmospheric density, mLFor liquid fuel jet quality, μ is liquid fuel Lean-burn coefficient, AFL, SFor liquid fuel chemically correct fuel；At the same time according to formula α=VG/(VG+Vair) pass through cylinder outer fuel nozzle control The injection pulse width of signal (c) master cylinder outer fuel nozzle (5) processed, adjustment gaseous fuel injection volume VG, gaseous fuel is accounted for always Air inflow volume fraction α is maintained between 0.25~0.35, and makes gaseous fuel pre- in IC engine cylinder external admission road (6) with air Enter after mixed in cylinder, in formula, α accounts for total air inflow volume fraction, V for gaseous fuelGVolume, V are sprayed for gaseous fuelairFor sky Air volume.
2. in a kind of gas/liquid double fuel cylinder/double injection apparatus, its structure are as follows outside for cylinder：Fuel distribution feed system includes gas Fuel reservoir (11), liquid fuel reservoir (12), the gaseous fuel pump (10) being connected with gaseous fuel holder (11), with The liquid fuel feed pump (13) of liquid fuel reservoir (12) connection, be connected with gaseous fuel pump (10) and liquid fuel feed pump (13) Be used to adjust spray into cylinder/the gas/liquid double fuel distributor (9) of cylinder outer fuel species, by inlet camshaft driving with The pressurized fuel that gas/liquid double fuel distributor (9) and cylinder fuel nozzle (4) are connected pumps (8), pumps (8) phase with pressurized fuel Connection is located at what is be passed through the cylinder fuel nozzle (4) of combustion chamber in cylinder cap and be connected with gas/liquid double fuel distributor (9) The cylinder outer fuel nozzle (5) of air intake duct (6) is passed through in inlet manifold；The core component of spray combustion electric control gear includes spray Penetrate burning electronic control unit (1)；
The spray combustion electronic control unit (1) by integral engine control sensor obtain actual speed signal (f), in cylinder/cylinder external combustion Material injection pressure signal (g), and for carrying out spray combustion control；
The spray combustion electronic control unit (1) is connected with gas/liquid double fuel distributor (9), and passes through gas/liquid double fuel point Orchestration control signal (a) adjustment fuel spray into cylinder in/cylinder outside fuel injection species；
The spray combustion electronic control unit (1) is connected with air throttle (7), and is adjusted and saved by throttle control signal (b) The aperture of valve (7)；
The spray combustion electronic control unit (1) is connected with cylinder outer fuel nozzle (5), and is controlled and believed by cylinder outer fuel nozzle The time for spraying and injection pulse width of number (c) master cylinder outer fuel injection；
The spray combustion electronic control unit (1) is connected with cylinder fuel nozzle (4), and is believed by cylinder fuel Jet control The time for spraying and injection pulse width of number (d) master cylinder fuel injection；
The spray combustion electronic control unit (1) is connected by ignition module (2) with spark plug (3), and passes through ignition control Signal (e) controls the angle of ignition；
It is characterized in that：
Cylinder injection gaseous fuel, the outer injecting LPG in liquefied condition of cylinder；Under the jet mode, spray combustion electronic control unit (1) passes through Gas/liquid double fuel distributor control signal (a) control gas/liquid double fuel distributor (9), makes in gaseous fuel holder (11) Gaseous fuel passes to pressurized fuel pump (8) after gaseous fuel pump (10) pressurization to be continued to be forced into more than 10MPa, while makes liquid Liquid fuel in fluid fuel holder (12) passes to cylinder outer fuel nozzle (5) after liquid fuel feed pump (13) pressurization；Pass through Liquid fuel is sprayed into internal combustion engine inlet (6) by cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5)；Pass through Cylinder fuel Jet control signal (d) control cylinder fuel nozzle (4) will pass through the gases at high pressure combustion of pressurized fuel pump (8) pressurization Material sprays into combustion chamber；Ignition module (2) is controlled to drive spark plug (3) to light a fire by ignition control signal (e)；
Spray combustion electronic control unit (1) controls gas/liquid double fuel distributor by gas/liquid double fuel distributor control signal (a) (9), keep the injection pulse width of cylinder outer fuel nozzle (5) and air throttle (7) aperture constant, according to formula AFG=(Vair×ρair)/ (VG×ρG) by the injection pulse width of cylinder fuel Jet control signal (d) adjustment cylinder fuel nozzle (4), adjust gaseous fuel Spray volume VG, and then by controlling gaseous fuel actual mixing ratio AFG, make internal combustion engine actual speed stabilization in 750 ± 50rpm, In formula, AFGFor gaseous fuel actual mixing ratio, VairFor volume of air, ρairFor atmospheric density, VGVolume is sprayed for gaseous fuel, ρGFor gaseous fuel density.
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