CN103615331A - Method of suppressing rough combustion of dual-fuel engine - Google Patents
Method of suppressing rough combustion of dual-fuel engine Download PDFInfo
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- CN103615331A CN103615331A CN201310602988.4A CN201310602988A CN103615331A CN 103615331 A CN103615331 A CN 103615331A CN 201310602988 A CN201310602988 A CN 201310602988A CN 103615331 A CN103615331 A CN 103615331A
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Abstract
The invention provides a method of suppressing rough combustion of a dual-fuel engine. The method includes: detecting quality of air entering from an air inlet; using a gasoline injector to control output of gasoline according to a first fuel equivalence ratio and the air quality; delivering the corresponding injection amount of gasoline to a fuel cylinder of the dual-fuel engine; using a diesel injector to control output of diesel according to a second fuel equivalence ratio and the air quality; delivering the corresponding injection amount of diesel to the fuel cylinder of the dual-fuel engine. The gasoline injector and the diesel injector are subjected to control of injection pulse width respectively, the concentration of gasoline injected from the air inlet and the concentration of diesel injected from the cylinder are controlled and changed, and accordingly, during the two stages of combustion heat release, heat release speed of instantaneous combustion can be reduced greatly, low rise ratio of inner cylinder pressure is achieved, and rough combustion when inner load of the dual-fuel engine is high can be suppressed effectively.
Description
Technical field
The present invention relates to technical field of internal combustion engines, especially a kind of method that suppresses duel fuel engine roughness noise.
Background technique
In order to increase substantially the thermal efficiency of petrol engine, improve the capacity usage ratio of Fuel Petroleum, within 2002, applicant has proposed the diesel oil ignited (HCII of a kind of Gasoline homogenous charge, Homogeneous Charge Induced Ignition) combustion mode [1,2,3], this combustion mode is used the great two kinds of fuel of physics and chemistry characteristic difference simultaneously, antiknock gasoline (as gasoline) is spurted into intake duct, in the air inlet of motor and compression stroke, fully mix with air, form the mixed gas of homogeneous; High-cetane fuel (as diesel oil) near to inner cylinder direct injection, involuntary ignition.HCII combustion mode is used the high compression ratio that is similar to diesel engine.Meanwhile, the diesel oil multiple spot spontaneous combustion spraying in cylinder, forms large-area fire area, and the Gasoline homogenous charge that ignites and mixed, and burning heat release speed is fast, and burning degree of constant volume is high.Than the single-point igniting of petrol engine, the multiple spot involuntary ignition of HCII pattern can reduce circular wave rate greatly, is conducive to realize lean-burn simultaneously.Test result shows, the thermal efficiency of combustion mode is significantly higher than petrol engine, can meet or exceed the level of diesel engine; Before catching fire, gasoline has formed uniform mixed gas, has reduced the ratio of diffusive combustion, also can effectively reduce carbon smoke exhaust.The pungent Reitz of university of University of Wisconsin-Madison in 2009 etc. propose active compression ignite (the Reactivity Controlled Compression Ignition that controls of vapour/diesel dual-fuel, RCCI) concept [4-6] of burning, by Fuel Petroleum is adopted to gas-duct jetting, diesel oil adopts in-cylinder direct injection, the maximum mean effective pressure of burning can reach 1.3MPa, original soot and NOx discharge can meet the requirement of Europe VI rules, and the thermal efficiency has been up to 53%.
But, during the large load of duel fuel engine, gasoline mixture overrich, the rate of pressure rise is too high, and roughness noise easily damages motor.The conventional rough method of the large load operation of inhibition compression ignition engine has reduction engine compression ratio at present, and retarded injection advance angle improves excess air coefficient etc.Although these methods can be alleviated the roughness noise problem of duel fuel engine to a certain extent, can cause adverse effect to the power character of motor, Economy and discharge.Therefore, how under the prerequisite that keeps engine performance, suppressing large load roughness noise problem, is a difficult problem in duel fuel engine exploitation.
Summary of the invention
(1) technical problem that will solve
The object of the invention is, a kind of method that suppresses duel fuel engine roughness noise is provided, thereby significantly reduce the rate of heat liberation that deflagrates while realizing two stage burnings, obtain low in-cylinder pressure rise rate, thereby the rough combustion while effectively suppressing high load in duel fuel engine.
(2) technological scheme
For solving the problems of the technologies described above, the invention provides a kind of method that suppresses duel fuel engine roughness noise, comprising:
Detection enters the quality of air by intake duct;
Quality based on the empty equivalent proportion of the first combustion and described air is controlled the output quantity of gasoline by gasoline ejector; And, to the fuel tank of described duel fuel engine, carry the gasoline of respective spray amount;
Quality based on the empty equivalent proportion of the second combustion and described air is controlled the output quantity of diesel oil by diesel injector; And, to the fuel tank of described duel fuel engine, carry the diesel oil of respective spray amount.
Wherein, the scope of the empty equivalent proportion of described the first combustion is 0.3～0.7, and the scope of the empty equivalent proportion of described the second combustion is 0.1～0.3.Preferably, the empty equivalent proportion of described the first combustion is 0.5, and the empty equivalent proportion of described the second combustion is 0.1.
As the present invention, further improve, this method also comprises while controlling gasoline output quantity: control gasoline output time.
As the present invention, further improve, this method also comprises while controlling diesel oil output quantity: control diesel oil output time.
Concrete, the scope of described diesel oil output time is-20 ° of CA～0 ° CA ATDC.Preferably, described diesel oil output time is-5 ° of CA ATDC.
(3) beneficial effect
Be different from background technique, the present invention is by intake port injection gasoline, in-cylinder injection diesel oil, by gasoline ejector and diesel injector, control respectively the injection pulse width of two kinds of oil sprayers, by the gasoline concentration (the empty equivalent proportion of the first combustion) of control break gas-duct jetting and the diesel engine concentration (the empty equivalent proportion of the second combustion) of in-cylinder injection, while realizing two stage burning heat releases, significantly reduce the rate of heat liberation that deflagrates, obtain low in-cylinder pressure rise rate, thereby the rough combustion while effectively suppressing high load in duel fuel engine, when the large load operation of remarkable inhibition duel fuel engine is rough, consumption improvement.And, owing to engine structure not being done to any change, compare other modes, can significantly reduce the cost of production of motor.
Accompanying drawing explanation
Fig. 1 is dual-fuel engine structure schematic diagram in an embodiment of the present invention;
Fig. 2 is duel fuel engine two stage burning rate of heat release in an embodiment of the present invention;
Fig. 3 is heat release curve during two stage burnings in an embodiment of the present invention;
Fig. 4 is the Pressure Rise Rate of motor during two stage burnings in an embodiment of the present invention;
Fig. 5 is duel fuel engine part-structure figure in an embodiment of the present invention.
Label declaration:
1 diesel oil tank; 2 diesel oil fuel consumption meters; 3 diesel injectors; 4 gasoline fuel tanks; 5 gasoline fuel consumption meters; 6 gasoline ejectors; 7 flowmeters; 8 air inlet surge tanks; 9 smoke meters; 10 exhaust gas analyzers; 11 exhaust surge tanks; 12 back pressure valves; 13 waste gas intercoolers; 14EGR valve; 15 cylinder pressure sensors; 16 charge amplifiers; 17 footmarks; 18 Combustion testers; 19 power measurers.
Embodiment
For making object of the present invention, content and advantage clearer, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
The invention provides a kind of method that duel fuel engine suppresses roughness noise, comprising:
Detection enters the quality of air by intake duct;
Quality based on the empty equivalent proportion of the first combustion and described air is controlled the output quantity of gasoline by gasoline ejector; And, to the fuel tank of described duel fuel engine, carry the gasoline of respective spray amount;
Quality based on the empty equivalent proportion of the second combustion and described air is controlled the output quantity of diesel oil by diesel injector; And, to the fuel tank of described duel fuel engine, carry the diesel oil of respective spray amount.
Principle of the present invention is: by changing the combustion space amount of premixing Fuel Petroleum (the empty equivalent proportion of the first combustion) and direct injection diesel fuel (the empty equivalent proportion of the second combustion), recently realize two stage burnings, suppress rough combustion.Its mode of execution is mainly to duel fuel engine, to carry air by intake duct, and the quality based on air and first is fired empty equivalent proportion and the second combustion space amount ratio sprays respectively gasoline and the diesel oil of respective spray amount, mainly by gasoline ejector and diesel injector, to control respectively the injection pulse width of two kinds of oil sprayers, thereby control the emitted dose of gasoline and diesel oil, realize two stage burnings, suppress rough combustion.Present embodiment is by intake port injection gasoline, in-cylinder injection diesel oil, wherein the emitted dose of gasoline and diesel oil is to control by controlling the injection pulse width of gasoline ejector and diesel injector, by gasoline ejector and diesel injector, control respectively the injection pulse width of two kinds of oil sprayers, thereby control the emitted dose of gasoline and diesel oil, thereby the empty equivalent proportion of the combustion that changes premixing Fuel Petroleum and direct injection diesel fuel, realizes two stage burnings, suppresses rough combustion.
Wherein, the scope of the empty equivalent proportion of described the first combustion is 0.3～0.7, and the scope of the empty equivalent proportion of described the second combustion is 0.1～0.3.The scope of described diesel oil output time is-20 ° of CA～0 ° CAATDC.Preferably, the empty equivalent proportion of described the first combustion is 0.5, and the empty equivalent proportion of described the second combustion is 0.1, and described diesel oil output time is-5 ° of CA ATDC.
The present invention is by controlling the gasoline concentration (the empty equivalent proportion of the first combustion) of gas-duct jetting and the diesel engine concentration (the empty equivalent proportion of the second combustion) of in-cylinder injection, while realizing two stage burning heat releases, significantly reduce the rate of heat liberation that deflagrates, obtain low in-cylinder pressure rise rate, thereby the rough combustion while effectively suppressing high load in duel fuel engine, when the large load operation of remarkable inhibition duel fuel engine is rough, consumption improvement.And, owing to engine structure not being done to any change, compare other modes, can significantly reduce the cost of production of motor.
For understanding better the technical program, present embodiment specifically sets forth in conjunction with duel fuel engine the technique effect that the technical program is brought, refer to Fig. 1, Fig. 1 provides a kind of duel fuel engine, comprise: main control system, fuel tank, gasoline oil-feed subtense angle, diesel oil feeding subtense angle, air input subtense angle, described diesel oil feeding subtense angle, gasoline oil-feed subtense angle and air input subtense angle are all electrically connected to described main control system.
Described main control system calculates corresponding gasoline output quantity for monitoring and according to air input subtense angle air quality and the empty equivalent proportion of the first combustion, and for calculating corresponding diesel oil output quantity based on described air quality and the empty equivalent proportion of the second combustion.
Described gasoline oil-feed subtense angle is for regulating gasoline output quantity and carrying the gasoline of corresponding output quantity to described air input subtense angle.
Described air input subtense angle is for delivery air and receive the gasoline of described gasoline oil-feed subtense angle based on the empty equivalent proportion conveying of the first combustion respective spray amount, based on described gasoline and air, generate the first mixed gas of homogeneous, and described the first mixed gas is carried to fuel tank.
Described diesel oil feeding subtense angle is for regulating diesel oil output quantity and carrying the diesel oil of corresponding output quantity to described fuel tank.Described air input subtense angle, also for carrying air to described fuel tank.
Concrete, refer to Fig. 1, duel fuel engine also comprises smoke meter 9, exhaust gas analyzer 10, exhaust surge tank 11, back pressure valve 12, waste gas intercooler 13, EGR valve 14, cylinder pressure sensor 15, charge amplifier 16, footmark 17, measures Combustion tester 18 and the power measurer 19 of combustion parameter.In the present invention, intake duct is air and enters duel fuel engine pipeline, in the present embodiment, is the connecting pipe of flowmeter 7 and air inlet surge tank 8 and fuel tank.
Diesel oil feeding subtense angle comprises: diesel oil tank 1, the diesel oil fuel consumption meter 2 being communicated with diesel oil tank 1 delivery outlet and for regulating diesel oil output quantity and spraying the diesel injector 3 of corresponding output quantity diesel oil, the inlet opening of described diesel injector 3 is communicated with the delivery outlet of diesel oil fuel consumption meter 2, and the delivery outlet of diesel injector 3 is communicated with the first inlet opening of fuel tank.
Gasoline oil-feed subtense angle comprises: gasoline fuel tank 4, the gasoline fuel consumption meter 5 being connected with gasoline fuel tank 4 delivery outlets and for regulating gasoline output quantity and spraying the gasoline ejector 6 of corresponding output quantity gasoline, the inlet opening of described gasoline ejector 6 is communicated with the delivery outlet of gasoline fuel consumption meter 5, and the delivery outlet of gasoline ejector 6 is communicated with the delivery outlet of air inlet surge tank 8.
Air input subtense angle comprises: measure and control the flowmeter 7 of air input and the air inlet surge tank 8 being communicated with described flowmeter 7 delivery outlets.
Present embodiment is by intake port injection gasoline, in-cylinder injection diesel oil, wherein the emitted dose of gasoline and diesel oil is to control by controlling the injection pulse width of gasoline ejector and diesel injector, by gasoline ejector and diesel injector, control respectively the injection pulse width of two kinds of oil sprayers, thereby control the emitted dose of gasoline and diesel oil.
Principle of the present invention is: by changing the combustion space amount of premixing Fuel Petroleum (the empty equivalent proportion of the first combustion) and direct injection diesel fuel (the empty equivalent proportion of the second combustion), recently realize two stage burnings, suppress rough combustion.Its mode of execution is mainly to duel fuel engine, to carry air by intake duct, and the gasoline of the quality based on air and the empty equivalent proportion acquisition of the first combustion respective spray amount, and the diesel oil of the quality based on air and the empty equivalent proportion acquisition of the second combustion respective spray amount, and by gasoline ejector and diesel injector, control respectively the injection pulse width of two kinds of oil sprayers, thereby control the emitted dose of gasoline and diesel oil, realize two stage burnings, suppress rough combustion.
The implementation method of present embodiment is: by intake duct, to duel fuel engine, carry a certain amount of air, when duel fuel engine runs to middle high load, based on the empty equivalent proportion of the first combustion and second, fire gasoline and the diesel oil that empty equivalent proportion obtains respective spray amount, and by gasoline ejector and diesel injector, control respectively the injection pulse width of two kinds of oil sprayers, thereby control the emitted dose of gasoline and diesel oil, change the concentration of pre-mixed fuel or direct injection fuel, thereby change the spontaneous combustion moment and the velocity of combustion of pre-mixed fuel, making its exothermic process and direct injection fuel exothermic process that separated but total rate of heat release occur was unlikely to again to delay.Form the very fast but nonoverlapping exothermic peak of two rate of heat liberation as shown in Figure 2.Thereby the rate of pressure rise while effectively reducing double fuel burning.When diesel oil concentration is excessive, also can go out two exothermic peaks, but its essence is completely different from dual-fuel two stages heat release, so the combustion of diesel oil in the method space amount is lower, concrete, the scope of the empty equivalent proportion of described the first combustion is 0.3～0.7, and the scope of the empty equivalent proportion of described the second combustion is 0.1～0.3.Preferably, the empty equivalent proportion of described the first combustion is 0.5, and the empty equivalent proportion of described the second combustion is 0.1.The present invention is by intake port injection gasoline, in-cylinder injection diesel oil, by gasoline ejector and diesel injector, controls respectively the injection pulse width of two kinds of oil sprayers, by changing the combustion space amount of premixing Fuel Petroleum and direct injection diesel fuel, recently realize two stage burnings, suppress rough combustion.
Described main control system is also for to gasoline oil-feed subtense angle, diesel oil feeding subtense angle sending controling instruction, to control respectively gasoline output time, the diesel oil output time of gasoline oil-feed subtense angle, diesel oil feeding subtense angle.Concrete, the scope of described diesel oil output time is-20 ° of CA～0 ° CA ATDC.Preferably, described diesel oil output time is-5 ° of CA ATDC.
In the present embodiment, duel fuel engine parameter is as shown in table 1.Gasoline adopts intake duct electric-controlled injection method, and emitted dose and time for spraying are all adjustable, and injection pressure is 0.3MPa.Draw combustion diesel fuel and use Electrocontrolled high-pressure ejecting system, the jet pressure of diesel oil, fuel injection quantity, time for spraying, injecting times all can free adjusting.Fuel tank is pressed and is gathered and rate of heat release analysis use AVL indicom 621 type Combustion testers, for detection of roughness noise degree, when roughness noise, postpones diesel oil output time.Normally gaseous Emission measurement is used M260747 gasoline and diesel dual-purpose tail-gas analyzer and AVL FTIR multicomponent analysis instrument.Carbon smoke exhaust is measured and is used FBY-2 auto smokemeter.
Table 1 engine parameter
| Cylinder diameter | 83.1mm |
| Stroke | 92mm |
| Displacement per cylinder | 0.5L |
| Compression ratio | 16.7 |
| Diesel injection system | High-pressure common rail |
| Gasoline injection system | Low pressure common rail system |
| Swirl rate | 1.7 |
Refer to Fig. 3-5, Fig. 5 is that present embodiment duel fuel engine is at the structural drawing at place, fuel tank inlet opening, can find out, the intake duct spray gasoline that present embodiment is used and the mode of in-cylinder direct injection diesel oil, realized duel fuel engine two stage burning heat releases by these two kinds of modes.Diesel oil oil spout is controlled at-5 ° of CA ATDC constantly, and diesel common rail pressure is 80MPa, and suction pressure is 0.1MPa, without EGR.Adjust the concentration of two kinds of fuel, at diesel oil, firing empty equivalent proportion is 0.1, it is to have realized two stage burnings at 0.5 o'clock that gasoline fires empty equivalent proportion, rate of heat release as shown in Figure 3, during two stage burnings, the Pressure Rise Rate of motor as shown in Figure 4, pressure maximum rise rate only have 0.6MPa/ (°) CA, circular wave is 2%.The exhaust smoke that application AVL439 smoke meter measures is 0.015/m, and conventional gas discharge aspect NOx brake specific exhaust emission is 10g/ (kW.h), and THC brake specific exhaust emission is 10g/ (kW.h), and CO brake specific exhaust emission is 10g/ (kW.h).Combustion efficiency is 0.95, and indicated thermal efficiency is 0.41.Compare single phase burning (Pressure Rise Rate 1.0MPa/ (°) CA, the thermal efficiency 38%), Pressure Rise Rate is low, and the thermal efficiency is high.
Present embodiment is by controlling the gasoline concentration of gas-duct jetting and the diesel engine concentration of in-cylinder injection, while realizing two stage burning heat releases, significantly reduce the rate of heat liberation that deflagrates, obtain low in-cylinder pressure rise rate, thereby the rough combustion while effectively suppressing high load in duel fuel engine, when the large load operation of remarkable inhibition duel fuel engine is rough, consumption improvement.And, owing to engine structure not being done to any change, compare other modes, can significantly reduce the cost of production of motor.
In sum, can draw advantage of the present invention:
(1) under same load, with respect to single phase heat release burning, the controlling method that the present invention uses can obviously reduce the peak value of the rate of pressure rise of HCII motor, and HCII engine reliability is significantly improved.NOx discharge also decreases.
(2) thermal efficiency is high, and than quick single phase heat release, indicated thermal efficiency has improved 1～3 percentage point.
(3), owing to whole combustion system not being carried out to structural modification, it is embodied as originally lower.
(4) become to wait and to put heat for approximate isobaric heat release, be conducive to the large load operation scope expansion of duel fuel engine.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a method that suppresses duel fuel engine roughness noise, is characterized in that, comprising:
Detection enters the quality of air by intake duct;
Based on the empty equivalent proportion of the first combustion and described air quality, by gasoline ejector, control the output quantity of gasoline; And, to the fuel tank of described duel fuel engine, carry the gasoline of respective spray amount;
Based on the empty equivalent proportion of the second combustion and described air quality, by diesel injector, control the output quantity of diesel oil; And, to the fuel tank of described duel fuel engine, carry the diesel oil of respective spray amount.
2. duel fuel engine according to claim 1 suppresses the method for roughness noise, it is characterized in that, the scope of the empty equivalent proportion of described the first combustion is 0.3～0.7, and the scope of the empty equivalent proportion of described the second combustion is 0.1～0.3.
3. the method for inhibition duel fuel engine roughness noise according to claim 2, is characterized in that: the empty equivalent proportion of described the first combustion is 0.5, and the empty equivalent proportion of described the second combustion is 0.1.
4. according to the method for the inhibition duel fuel engine roughness noise described in claims 1 to 3 any one, it is characterized in that, while controlling gasoline output quantity, also comprise: control gasoline output time.
5. according to the method for the inhibition duel fuel engine roughness noise described in the arbitrary top of claims 1 to 3, it is characterized in that, while controlling diesel oil output quantity, also comprise: control diesel oil output time.
6. the method for inhibition duel fuel engine roughness noise according to claim 5, is characterized in that: the scope of described diesel oil output time is-20 ° of CA～0 ° CA ATDC.
7. the method for inhibition duel fuel engine roughness noise according to claim 6, is characterized in that, described diesel oil output time is-5 ° of CA ATDC.
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| CN104033257A (en) * | 2014-06-27 | 2014-09-10 | 长城汽车股份有限公司 | Method and system for controlling double-fuel engine |
| CN105020038A (en) * | 2014-04-29 | 2015-11-04 | 长城汽车股份有限公司 | Running control method and system for dual-fuel engine and vehicle |
| CN106150732A (en) * | 2015-03-26 | 2016-11-23 | 长城汽车股份有限公司 | The control method of dual fuel engine, system and vehicle |
| CN110043379A (en) * | 2019-05-10 | 2019-07-23 | 重庆潍柴发动机有限公司 | A kind of controller for gas, system, method and controller |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105020038A (en) * | 2014-04-29 | 2015-11-04 | 长城汽车股份有限公司 | Running control method and system for dual-fuel engine and vehicle |
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| CN106150732A (en) * | 2015-03-26 | 2016-11-23 | 长城汽车股份有限公司 | The control method of dual fuel engine, system and vehicle |
| CN110043379A (en) * | 2019-05-10 | 2019-07-23 | 重庆潍柴发动机有限公司 | A kind of controller for gas, system, method and controller |
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