CN105673281A - Gas/liquid dual fuel in-cylinder/out-cylinder double-injection device and control method - Google Patents

Gas/liquid dual fuel in-cylinder/out-cylinder double-injection device and control method Download PDF

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Publication number
CN105673281A
CN105673281A CN201610219340.2A CN201610219340A CN105673281A CN 105673281 A CN105673281 A CN 105673281A CN 201610219340 A CN201610219340 A CN 201610219340A CN 105673281 A CN105673281 A CN 105673281A
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fuel
cylinder
liquid
control signal
gas
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CN105673281B (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

The invention belongs to the field of internal combustion engine control, and particularly relates to a gas/liquid dual fuel distributing and feeding system and a gas/liquid dual fuel in-cylinder/out-cylinder double-injection and combustion process control device.A fuel distributing and feeding system for gas/liquid dual fuel distributing and feeding and an injection combustion electronic control unit for controlling the gas/liquid dual fuel in-cylinder/out-cylinder double-injection and combustion process are adopted in the device.The injection combustion electronic control unit can adjust the injection types of fuel injected inside and outside a cylinder through the fuel distributing and feeding system according to the operation working state conditions of an internal combustion engine, reduces heat transfer loss and pumping loss of the internal combustion engine and improves fuel combustion, then fuel consumption and pollutant emission are reduced while performance of the internal combustion engine is ensured, and the effects of energy conservation and emission reduction are achieved.

Description

In a kind of gas/liquid double fuel cylinder/cylinder double; two injection apparatus and control method outward
Technical field
The present invention provide a kind of in the gas/liquid double fuel cylinder of ignition internal combustion engine/the outer double; two injection apparatus of cylinder and control method, it is specifically related 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
Existing single-fuel single position injection ignition internal combustion engine adopts the burning of equivalent proportion condition, and Fuel Consumption is big, pollutant emission is high; Although additionally, the liquid fuel net energy density such as gasoline, diesel oil, methanol are high, but burning needs atomization process and there is liquefaction phenomenon, has both added fuel oil consumption, has improve again pollutant emission; And although the gaseous fuels such as natural gas, liquefied petroleum gas, hydrogen gasification need not be absent from liquefaction phenomenon, but net energy density is low, make combustion engine powered hydraulic performance decline, and gaseous fuel sprays in cylinder external admission road and takies admission space, affects the efficiency of internal combustion engine.
In-cylinder direct-jet technology, refers to be installed in combustor by atomizer, injects fuel directly into in-cylinder combustion. Liquid fuel can adopt lean mode to burn in conjunction with this technology, reduce fuel consumption, simultaneously because expulsion pressure improves, be conducive to fuel atomizing, but it is limited to the lean flammability limit that liquid fuel is narrower, the reduction effect of fuel consumption is limited, just the outer discharge that also add the pollutant such as particulate matter and nitrogen oxides; Gaseous fuel can effectively solve fuel in conjunction with this technology and take admission space and affect the problem of the efficiency of internal combustion engine, but the impact of internal combustion engine power performance still cannot be solved by its relatively low net energy density.
By spraying outside liquid fuel cylinder injection, gaseous fuel cylinder, the lean flammability limit of liquid fuel and air inlet gaseous mixture in cylinder can be widened by the premix of gaseous fuel Yu air, realize less fuel consumption, may additionally facilitate the burning of gaseous mixture in cylinder simultaneously, reduce cylinder temperature, while reducing internal combustion engine radiation loss, promoting its thermal efficiency, reduce the discharge such as particulate matter and nitrogen oxides, additionally, bigger throttle opening also can be coordinated, reduce pumping loss, promote internal combustion engine thermal efficiency; By spraying outside gaseous fuel cylinder injection, liquid fuel cylinder, gaseous fuel can avoided to take admission space, while affecting internal combustion engine charging efficiency, coordinate bigger throttle opening, reduce pumping loss, it is achieved improve the purpose of internal combustion engine thermal efficiency.Therefore, use in gas/liquid double fuel cylinder/the spray combustion modes of the outer double; two injections of cylinder while ensureing combustion engine powered performance, can reduce Fuel Consumption and pollutant emission, it is achieved the effect of energy-saving and emission-reduction with control method.
Summary of the invention
The problem big for existing single-fuel single position spray site combustion automotive fuel consumption, pollutant emission is high, the invention provides a kind of gas/liquid double fuel double; two injection ignition internal combustion engine and control method. The present invention adopt spray outside cylinder injection liquid fuel, cylinder gaseous fuel and cylinder injection gaseous fuel, the outer two kinds of jet modes of injecting LPG in liquefied condition of cylinder with the use of, cylinder fuel is made to burn in broader lean flammability limit interval, realize, while ensureing combustion engine powered performance, reducing the purpose of Fuel Consumption and pollutant emission.
For achieving the above object, present invention employs following technical scheme:
In a kind of gas/liquid double fuel cylinder/the outer double, two injection apparatus of cylinder, it is characterized in that: fuel distribution feed system includes gaseous fuel bin (11), liquid fuel reservoir (12), the gaseous fuel pump (10) being connected with gaseous fuel bin (11), the liquid fuel feed pump (13) being connected with liquid fuel reservoir (12), what be connected with gaseous fuel pump (10) and liquid fuel feed pump (13) sprays in cylinder/gas/liquid double fuel allotter (9) of cylinder outer fuel kind for adjusting, the pressurized fuel pump (8) being connected with gas/liquid double fuel allotter (9) and cylinder fuel nozzle (4) driven by inlet camshaft, what be connected with pressurized fuel pump (8) is arranged in the cylinder fuel nozzle (4) that cylinder cap passes into combustor and the inlet manifold that is arranged in being connected with gas/liquid double fuel allotter (9) passes into the cylinder outer fuel nozzle (5) of air intake duct (6), the core component of spray combustion electric control gear includes spray combustion ECU (1),
Described spray combustion ECU (1) obtains actual speed signal (f) by integral engine control sensor, in cylinder/cylinder outer fuel expulsion pressure signal (g), and be used for carrying out spray combustion control;
Described spray combustion ECU (1) is connected with gas/liquid double fuel allotter (9), and by gas/liquid double fuel allotter control signal (a) adjust fuel spray into cylinder in/cylinder outside fuel injection kind;
Described spray combustion ECU (1) is connected with air throttle (7), and is adjusted the aperture of air throttle (7) by throttle control signal (b);
Described spray combustion ECU (1) is connected with cylinder outer fuel nozzle (5), and passes through time for spraying and the injection pulse width of the injection of cylinder outer fuel nozzle control signal (c) master cylinder outer fuel;
Described spray combustion ECU (1) is connected with cylinder fuel nozzle (4), and passes through time for spraying and the injection pulse width of cylinder fuel Jet control signal (d) master cylinder fuel injection;
Described spray combustion ECU (1) is connected with spark plug (3) by ignition module (2), and controls the angle of ignition by ignition control signal (e).
Gaseous fuel includes hydrogen, natural gas, liquefied petroleum gas or dimethyl ether; Liquid fuel includes gasoline, methanol or ethanol.
The method applying described device, it is characterised in that:
Jet mode one: cylinder injection liquid fuel, sprays gaseous fuel outside cylinder; Under this jet mode, spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), make the liquid fuel in liquid fuel reservoir (12) pass to pressurized fuel pump (8) after liquid fuel feed pump (13) is pressurizeed to continue to be forced into more than 10MPa, make the gaseous fuel in gaseous fuel bin (11) pass to cylinder outer fuel nozzle (5) after gaseous fuel pump (10) is pressurizeed simultaneously;By cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), gaseous fuel sprayed into internal combustion engine inlet (6); By cylinder fuel Jet control signal (d) master cylinder fuel nozzle (4), the high pressure liquid fuel pressurizeed through pressurized fuel pump (8) is sprayed into combustor; Controlling ignition module (2) by ignition control signal (e) drives spark plug (3) to light a fire;
Jet mode two: cylinder injection gaseous fuel, the outer injecting LPG in liquefied condition of cylinder; Under this jet mode, spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), make the gaseous fuel in gaseous fuel bin (11) pass to pressurized fuel pump (8) after gaseous fuel pump (10) is pressurizeed to continue to be forced into more than 10MPa, make the liquid fuel in liquid fuel reservoir (12) pass to cylinder outer fuel nozzle (5) after liquid fuel feed pump (13) is pressurizeed simultaneously; By cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), liquid fuel sprayed into internal combustion engine inlet (6); By cylinder fuel Jet control signal (d) master cylinder fuel nozzle (4), the pressurized fuel gas pressurizeed through pressurized fuel pump (8) is sprayed into combustor; Controlling ignition module (2) by ignition control signal (e) drives spark plug (3) to light a fire.
Spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), uses jet mode one; 20% is increased by throttle control signal (b) throttle valve (7) aperture; According to formula AFL=(Vair×ρair)/mL, by the injection pulse width of cylinder fuel Jet control signal (d) master cylinder fuel nozzle (4), adjust liquid fuel jet quality mL, make liquid fuel be in lean burn burning, lean burn is AFLThis fuel theoretical value of >, AFL=μ × AFL, S, AFLFor liquid 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; Simultaneously according to formula α=VG/(VG+Vair) by the injection pulse width of cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), adjust gaseous fuel injection volume VG, making gaseous fuel account 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 is that gaseous fuel accounts for total air inflow volume fraction, VGFor gaseous fuel spray injection volume, VairFor volume of air.
Spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), uses the jet mode two described in claim 3; The injection pulse width and air throttle (7) aperture that keep cylinder outer fuel nozzle (5) are constant, according to formula AFG=(Vair×ρair)/(VG×ρG) injection pulse width of cylinder fuel nozzle (4) is adjusted by cylinder fuel Jet control signal (d), adjust gaseous fuel injection volume VG, and then by controlling gaseous fuel actual mixing ratio AFG, make internal combustion engine actual speed stable in 750 ± 50rpm, formula, AFGFor gaseous fuel actual mixing ratio, VairFor volume of air, ρairFor atmospheric density, VGVolume, ρ is sprayed for gaseous fuelGFor gaseous fuel density.
Spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), uses jet mode one;It is shown in a fully open operation by throttle control signal (b) throttle valve (7), injection pulse width by the injection pulse width of cylinder fuel Jet control signal (d) and cylinder outer fuel nozzle control signal (c) master cylinder fuel nozzle (4) respectively and cylinder outer fuel nozzle (5), it is achieved the adjustment of engine load conversion.
The invention has the beneficial effects as follows: big for existing single-fuel single position spray site combustion automotive fuel consumption, the problem that pollutant emission is high, gaseous fuel is utilized not need gasification, net energy density that liquid fuel is of a relatively high and fuel cylinder injection can realize the feature of lean burn, when making internal combustion engine adopt jet mode one to run, by gaseous fuel and the air premix in cylinder external admission road, widen liquid fuel lean flammability limit in cylinder, achieve under the premise ensureing combustion engine powered performance, reduce the purpose of Fuel Consumption and pollutant emission, simultaneously also by the increase of sub-load throttle opening, reduce internal combustion engine pumping loss, and then improve the thermal efficiency of internal combustion engine, when internal combustion engine adopts jet mode two to run, by the cylinder injection of gaseous fuel, solve injection outside gaseous fuel cylinder and take the problem that charging volume affects the thermal efficiency, improve the lean burn condition of gas in the jar fuel under bigger throttle opening by injection outside the cylinder of liquid fuel simultaneously, achieve the purpose by adjusting gas in the jar fuel injection amount stable objects idling, improve the thermal efficiency of internal combustion engine, reduce fuel consumption and the pollutant emission of internal combustion engine.
Accompanying drawing explanation
Fig. 1 is structure and the 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 fuel nozzle; 6 internal combustion engine inlets; 7 air throttles; 8 pressurized fuel pumps; 9 gas/liquid double fuel allotters; 10 gaseous fuel pump; 11 gaseous fuel bins; 12 liquid fuel reservoir; 13 liquid fuel feed pump;
A. gas/liquid double fuel allotter 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 expulsion pressure signal.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, in the present embodiment a kind of in the gas/liquid double fuel cylinder of ignition internal combustion engine/the outer double; two injection apparatus of cylinder and control method, this device adopt a set of fuel distribution feed system for the distribution supply of gas/liquid double fuel and a set of in gas/liquid double fuel cylinder/the spray combustion ECU of the outer double; two injections of cylinder and Combustion Process Control.
It is characterized in that: fuel distribution feed system includes gaseous fuel bin (11), liquid fuel reservoir (12), the gaseous fuel pump (10) being connected with gaseous fuel bin (11), the liquid fuel feed pump (13) being connected with liquid fuel reservoir (12), what be connected with gaseous fuel pump (10) and liquid fuel feed pump (13) sprays in cylinder/gas/liquid double fuel allotter (9) of cylinder outer fuel kind for adjusting, the pressurized fuel pump (8) being connected with gas/liquid double fuel allotter (9) and cylinder fuel nozzle (4) driven by inlet camshaft, what be connected with pressurized fuel pump (8) is arranged in the cylinder fuel nozzle (4) that cylinder cap passes into combustor and the inlet manifold that is arranged in being connected with gas/liquid double fuel allotter (9) passes into the cylinder outer fuel nozzle (5) of air intake duct (6),The core component of spray combustion electric control gear includes spray combustion ECU (1).
Described spray combustion ECU (1) obtains actual speed signal (f) by integral engine control sensor, in cylinder/cylinder outer fuel expulsion pressure signal (g), and be used for carrying out spray combustion control.
Described spray combustion ECU (1) is connected with gas/liquid double fuel allotter (9), and by gas/liquid double fuel allotter control signal (a) adjust fuel spray into cylinder in/cylinder outside fuel injection kind;
Described spray combustion ECU (1) is connected with air throttle (7), and is adjusted the aperture of air throttle (7) by throttle control signal (b);
Described spray combustion ECU (1) is connected with cylinder outer fuel nozzle (5), and passes through time for spraying and the injection pulse width of the injection of cylinder outer fuel nozzle control signal (c) master cylinder outer fuel;
Described spray combustion ECU (1) is connected with cylinder fuel nozzle (4), and passes through time for spraying and the injection pulse width of cylinder fuel Jet control signal (d) master cylinder fuel injection;
Described spray combustion ECU (1) is connected with spark plug (3) by ignition module (2), and controls the angle of ignition by ignition control signal (e);
Described gaseous fuel includes hydrogen, natural gas, liquefied petroleum gas or dimethyl ether; Liquid fuel includes gasoline, methanol or ethanol.
1) jet mode of in gas/liquid double fuel cylinder/outer double; two injection apparatus of cylinder and control method thereof, it is characterised in that:
Jet mode one: cylinder injection liquid fuel, sprays gaseous fuel outside cylinder. Under this jet mode, spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), make the liquid fuel in liquid fuel reservoir (12) pass to pressurized fuel pump (8) after liquid fuel feed pump (13) is pressurizeed to continue to be forced into more than 10MPa, make the gaseous fuel in gaseous fuel bin (11) pass to cylinder outer fuel nozzle (5) after gaseous fuel pump (10) is pressurizeed simultaneously; By cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), gaseous fuel sprayed into internal combustion engine inlet (6); By cylinder fuel Jet control signal (d) master cylinder fuel nozzle (4), the high pressure liquid fuel pressurizeed through pressurized fuel pump (8) is sprayed into combustor; Controlling ignition module (2) by ignition control signal (e) drives spark plug (3) to light a fire;
Jet mode two: cylinder injection gaseous fuel, the outer injecting LPG in liquefied condition of cylinder. Under this jet mode, spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), make the gaseous fuel in gaseous fuel bin (11) pass to pressurized fuel pump (8) after gaseous fuel pump (10) is pressurizeed to continue to be forced into more than 10MPa, make the liquid fuel in liquid fuel reservoir (12) pass to cylinder outer fuel nozzle (5) after liquid fuel feed pump (13) is pressurizeed simultaneously; By cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), liquid fuel sprayed into internal combustion engine inlet (6); By cylinder fuel Jet control signal (d) master cylinder fuel nozzle (4), the pressurized fuel gas pressurizeed through pressurized fuel pump (8) is sprayed into combustor; Controlling ignition module (2) by ignition control signal (e) drives spark plug (3) to light a fire;
Spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), uses the jet mode one described in claim 3;20% is increased by throttle control signal (b) throttle valve (7) aperture; According to formula AFL=(Vair×ρair)/mL, by the injection pulse width of cylinder fuel Jet control signal (d) master cylinder fuel nozzle (4), adjust liquid fuel jet quality mL, make liquid fuel be in lean burn (AFL=μ × AFL, S) burning, in formula, AFLFor liquid fuel actual mixing ratio, VairFor volume of air (m3), ρairFor atmospheric density (kg/m2), mLFor liquid fuel jet quality (kg), μ is liquid fuel lean-burn coefficient, AFL, SFor liquid fuel chemically correct fuel; Simultaneously according to formula α=VG/(VG+Vair) by the injection pulse width of cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), adjust gaseous fuel injection volume VG, making gaseous fuel account 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 is that gaseous fuel accounts for total air inflow volume fraction, VGFor gaseous fuel spray injection volume (m3), VairFor volume of air (m3);
Spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), uses the jet mode two described in claim 3; The injection pulse width and air throttle (7) aperture that keep cylinder outer fuel nozzle (5) are constant, according to formula AFG=(Vair×ρair)/(VG×ρG) injection pulse width of cylinder fuel nozzle (4) is adjusted by cylinder fuel Jet control signal (d), adjust gaseous fuel injection volume VG, and then by controlling gaseous fuel actual mixing ratio AFG, make internal combustion engine actual speed stable near internal combustion engine target idling speed (750 ± 50rpm), in formula, AFGFor gaseous fuel actual mixing ratio, VairFor volume of air (m3), ρairFor atmospheric density (kg/m3), VGVolume (m is sprayed for gaseous fuel3), ρGFor gaseous fuel density (kg/m3);
Spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), uses jet mode one; It is shown in a fully open operation by throttle control signal (b) throttle valve (7), injection pulse width by the injection pulse width of cylinder fuel Jet control signal (d) and cylinder outer fuel nozzle control signal (c) master cylinder fuel nozzle (4) respectively and cylinder outer fuel nozzle (5), it is achieved the adjustment of engine load conversion.
On internal combustion engine experimental stand, 1.6L gas (hydrogen)/liquid (gasoline) double fuel double; two injection ignition internal combustion engine is that the example actual effect to said apparatus and control method has been verified, test result indicate that, compared with gasoline engine before distributing feed system, spray combustion control device and control strategy with adopting fuel of the present invention, when starting, the time of internal combustion engine entrance stable state shortens 63.2%, and needed for front 11s, total amount of fuel reduces 31.2%; Fuel Consumption during idling reduces 36.4%, and unburned hydrocarbon, carbon monoxide, discharged nitrous oxides reduce 54.2%, 16.7%, 32.6% respectively; In 1400rpm load-characteristic test, Fuel Consumption on average reduces by 32.7%.

Claims (6)

1. in a gas/liquid double fuel cylinder/outer double, two injection apparatus of cylinder, it is characterized in that: fuel distribution feed system includes gaseous fuel bin (11), liquid fuel reservoir (12), the gaseous fuel pump (10) being connected with gaseous fuel bin (11), the liquid fuel feed pump (13) being connected with liquid fuel reservoir (12), what be connected with gaseous fuel pump (10) and liquid fuel feed pump (13) sprays in cylinder/gas/liquid double fuel allotter (9) of cylinder outer fuel kind for adjusting, the pressurized fuel pump (8) being connected with gas/liquid double fuel allotter (9) and cylinder fuel nozzle (4) driven by inlet camshaft, what be connected with pressurized fuel pump (8) is arranged in the cylinder fuel nozzle (4) that cylinder cap passes into combustor and the inlet manifold that is arranged in being connected with gas/liquid double fuel allotter (9) passes into the cylinder outer fuel nozzle (5) of air intake duct (6),The core component of spray combustion electric control gear includes spray combustion ECU (1);
Described spray combustion ECU (1) obtains actual speed signal (f) by integral engine control sensor, in cylinder/cylinder outer fuel expulsion pressure signal (g), and be used for carrying out spray combustion control;
Described spray combustion ECU (1) is connected with gas/liquid double fuel allotter (9), and by gas/liquid double fuel allotter control signal (a) adjust fuel spray into cylinder in/cylinder outside fuel injection kind;
Described spray combustion ECU (1) is connected with air throttle (7), and is adjusted the aperture of air throttle (7) by throttle control signal (b);
Described spray combustion ECU (1) is connected with cylinder outer fuel nozzle (5), and passes through time for spraying and the injection pulse width of the injection of cylinder outer fuel nozzle control signal (c) master cylinder outer fuel;
Described spray combustion ECU (1) is connected with cylinder fuel nozzle (4), and passes through time for spraying and the injection pulse width of cylinder fuel Jet control signal (d) master cylinder fuel injection;
Described spray combustion ECU (1) is connected with spark plug (3) by ignition module (2), and controls the angle of ignition by ignition control signal (e).
2. device according to claim 1, it is characterised in that: gaseous fuel includes hydrogen, natural gas, liquefied petroleum gas or dimethyl ether; Liquid fuel includes gasoline, methanol or ethanol.
3. the method applying device as claimed in claim 1, it is characterised in that:
Jet mode one: cylinder injection liquid fuel, sprays gaseous fuel outside cylinder; Under this jet mode, spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), make the liquid fuel in liquid fuel reservoir (12) pass to pressurized fuel pump (8) after liquid fuel feed pump (13) is pressurizeed to continue to be forced into more than 10MPa, make the gaseous fuel in gaseous fuel bin (11) pass to cylinder outer fuel nozzle (5) after gaseous fuel pump (10) is pressurizeed simultaneously; By cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), gaseous fuel sprayed into internal combustion engine inlet (6); By cylinder fuel Jet control signal (d) master cylinder fuel nozzle (4), the high pressure liquid fuel pressurizeed through pressurized fuel pump (8) is sprayed into combustor; Controlling ignition module (2) by ignition control signal (e) drives spark plug (3) to light a fire;
Jet mode two: cylinder injection gaseous fuel, the outer injecting LPG in liquefied condition of cylinder; Under this jet mode, spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), make the gaseous fuel in gaseous fuel bin (11) pass to pressurized fuel pump (8) after gaseous fuel pump (10) is pressurizeed to continue to be forced into more than 10MPa, make the liquid fuel in liquid fuel reservoir (12) pass to cylinder outer fuel nozzle (5) after liquid fuel feed pump (13) is pressurizeed simultaneously; By cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), liquid fuel sprayed into internal combustion engine inlet (6); By cylinder fuel Jet control signal (d) master cylinder fuel nozzle (4), the pressurized fuel gas pressurizeed through pressurized fuel pump (8) is sprayed into combustor; Controlling ignition module (2) by ignition control signal (e) drives spark plug (3) to light a fire.
4. method according to claim 3, it is characterised in that: spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), uses jet mode one;20% is increased by throttle control signal (b) throttle valve (7) aperture; According to formula AFL=(Vair×ρair)/mLBy the injection pulse width of cylinder fuel Jet control signal (d) master cylinder fuel nozzle (4), adjust liquid fuel jet quality mL, make liquid fuel be in lean burn burning, lean burn is AFLThis fuel theoretical value of >, AFL=μ × AFL, S, AFLFor liquid fuel actual mixing ratio, VairFor volume of air, ρsirFor atmospheric density, mLFor liquid fuel jet quality, μ is liquid fuel lean-burn coefficient, AFL, SFor liquid fuel chemically correct fuel; Simultaneously according to formula α=VG/(VG+Vsir) by the injection pulse width of cylinder outer fuel nozzle control signal (c) master cylinder outer fuel nozzle (5), adjust gaseous fuel injection volume VG, making gaseous fuel account 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 is that gaseous fuel accounts for total air inflow volume fraction, VCFor gaseous fuel spray injection volume, VairFor volume of air.
5. method according to claim 3, it is characterized in that: spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), use the jet mode two described in claim 3; The injection pulse width and air throttle (7) aperture that keep cylinder outer fuel nozzle (5) are constant, according to formula AFG=(Vair×ρair)/(VG×ρG) injection pulse width of cylinder fuel nozzle (4) is adjusted by cylinder fuel Jet control signal (d), adjust gaseous fuel injection volume VG, and then by controlling gaseous fuel actual mixing ratio AFG, make internal combustion engine actual speed stable in 750 ± 50rpm, formula, AFGFor gaseous fuel actual mixing ratio, VairFor volume of air, ρairFor atmospheric density, VGVolume, ρ is sprayed for gaseous fuelGFor gaseous fuel density.
6. method according to claim 3, it is characterised in that: spray combustion ECU (1) controls gas/liquid double fuel allotter (9) by gas/liquid double fuel allotter control signal (a), uses jet mode one; It is shown in a fully open operation by throttle control signal (b) throttle valve (7), injection pulse width by the injection pulse width of cylinder fuel Jet control signal (d) and cylinder outer fuel nozzle control signal (c) master cylinder fuel nozzle (4) respectively and cylinder outer fuel nozzle (5), it is achieved the adjustment of engine load conversion.
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