CN104005862A - Method and system for controlling internal combustion engine and vehicle - Google Patents
Method and system for controlling internal combustion engine and vehicle Download PDFInfo
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- CN104005862A CN104005862A CN201410240346.9A CN201410240346A CN104005862A CN 104005862 A CN104005862 A CN 104005862A CN 201410240346 A CN201410240346 A CN 201410240346A CN 104005862 A CN104005862 A CN 104005862A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention provides a method for controlling an internal combustion engine. Each working cycle of the internal combustion engine comprises air inflow, compression, expansion, recompression, re-expansion and exhaust stroke. The method comprises a gasoline layered lean combustion stage of spraying gasoline into a cylinder of the internal combustion engine in the air inflow, compression and expansion stroke process so as to enable the internal combustion engine to do work by means of the gasoline, and enabling the air-fuel ratio of the gasoline and air mixture to be located between a first threshold and a second threshold; and a diesel compression ignition stage of utilizing heat of waste heat after gasoline combustion at the gasoline layered lean combustion stage to spray diesel to the cylinder of the internal combustion engine during the recompression, re-expansion and exhaust stroke process so as to enable internal combustion engine to do work by means of the diesel. The method can improve fuel economy of a vehicle, and the discharge amount of tail gas pollutants of the vehicle can be effectively reduced. The invention further provides a system for controlling the internal combustion engine and the vehicle.
Description
Technical field
The present invention relates to automobile technical field, particularly a kind of controlling method of internal-combustion engine, system and vehicle.
Background technique
Internal-combustion engine (as motor) is as playing vital effect as the power source of automobile, aircraft etc.During internal combustion engine, can consume non-renewable energy resources as oil, and produce tail gas pollution, along with day by day warming of global climate, such as the emission problem of CO2, become the focus of global human concern.Therefore, how to reduce energy consumption and reduce tail gas pollution and seem particularly important.
For traditional four stroke engine, the thermal efficiency is on the low side, for example, have 30% exhaust energy waste, and produce a large amount of exhaust pollutants.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, one object of the present invention is to propose a kind of controlling method of internal-combustion engine.The method can improve the fuel economy of vehicle, and can effectively reduce the discharge amount of the exhaust pollutant of vehicle.
Another object of the present invention is to propose a kind of control system of internal-combustion engine.
A further object of the present invention is to propose a kind of vehicle.
To achieve these goals, the embodiment of a first aspect of the present invention discloses a kind of controlling method of internal-combustion engine, each work cycle of described internal-combustion engine comprises: aspirating stroke, compression stroke, expansion stroke, recompression stroke, expansion stroke and exhaust stroke again, said method comprising the steps of: the gasoline layering lean combustion stage: in described aspirating stroke, compression stroke and expansion stroke process, to injected petrol in the cylinder of described internal-combustion engine, so that described internal-combustion engine utilizes described gasoline to do work, wherein, the air fuel ratio of described gas mixture is between first threshold and Second Threshold, described first threshold is less than described Second Threshold, the diesel oil compression ignite stage: utilize described gasoline layering lean combustion during the stage after gasoline combustion the heat of waste gas in described recompression stroke, expansion stroke and exhaust stroke process again, to the vapour in-cylinder injection diesel oil of described internal-combustion engine, so that described internal-combustion engine utilizes described diesel oil to do work.
According to the controlling method of the internal-combustion engine of the embodiment of the present invention, adopt the two stage combustion pattern of gasoline layering lean combustion and diesel oil compression ignite, in the gasoline layering lean combustion stage, can reduce the pumping loss of motor, the compression of raising motor is the ratio of specific heat of products of combustion when, improves the thermal efficiency, in the diesel oil compression ignite stage, by the control to diesel injection number of times and oil spout phase place, can in expansion stroke and recompression stroke, carry out repeatedly or single injection event fuel oil.By two stage combustion, the final air fuel ratio of mixture that keeps is near chemically correct fuel, in the time of can solving gasoline layering lean combustion, motor produces the problem of too high NOx (nitrogen oxide), motor is done merit twice in a work cycle, improve specific power, and when improving specific power, reduced the idling speed of motor and the engine speed under output Same Efficieney, thereby reduced engine friction, improved fuel economy.
In addition, the controlling method of internal-combustion engine according to the above embodiment of the present invention can also have following additional technical characteristics:
In some instances, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is less than the operating mode of the first default load, in the described gasoline layering lean combustion stage, adopt secondary injection gasoline pattern, the described diesel oil compression ignite stage adopts the pre-spray of diesel oil and main jet pattern, wherein, injected petrol phase place SOI=is (250 ° for the first time, 350 °) CA BTDC, injected petrol phase place EOI=is (40 ° for the second time, 55 °) CA BTDC, firing angle=(25 °, 40 °), injected petrol amount for the first time: injected petrol amount=3:2 for the second time, the λ that closes on spark plug is greater than 1, diesel oil sprays phase place EOI in advance
1=(2000 °, 250 °) CA ATDC, diesel oil main jet phase place EOI
2=(340 °, 350 °) CA ATDC, diesel oil main jet amount: the pre-discharge rate=2:1 of diesel oil.
In some instances, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the described first default load and is less than the operating mode of the second default load, in the described gasoline layering lean combustion stage, adopt secondary injection gasoline pattern, the described diesel oil compression ignite stage adopts a diesel injection pattern, wherein, the described second default load is greater than the described first default load, wherein, and injected petrol phase place SOI for the first time
1=(300 °, 350 °) CA BTDC, for the second time injected petrol phase place SOI
2=(200 °, 150 °) CA BTDC, for the first time injected petrol amount: injected petrol amount=1:2 for the second time, closes on λ=20 of spark plug; Diesel injection phase place oil spout phase place EOI=(320 °, 340 °) CA ATDC.
In some instances, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the operating mode of the described second default load, employing multi-injection mode carries out diesel oil compression ignite or gasoline is lighted, wherein, when carrying out diesel oil compression ignite, main jet oil spout phase place SOI is later than or equals compression top center front 30 for the second time and spends, main jet oil spout phase place EOI early than or equal for the second time 20 degree after compression top center, when carrying out gasoline while lighting, described λ≤1, and light a fire when described recompression stroke, wherein, the described the 3rd default load is greater than the described second default load.
In some instances, described first threshold is 25, and described Second Threshold is 40.
The embodiment of second aspect present invention discloses a kind of control system of internal-combustion engine, each work cycle of described internal-combustion engine comprises: aspirating stroke, compression stroke, expansion stroke, recompression stroke, expansion stroke and exhaust stroke again, described system comprises: gasoline layering lean combustion control module, be used in described aspirating stroke, compression stroke and expansion stroke process, to injected petrol in the cylinder of described internal-combustion engine, so that described internal-combustion engine utilizes described gasoline to do work, wherein, the air fuel ratio of described gas mixture is between first threshold and Second Threshold, described first threshold is less than described Second Threshold, diesel oil compression ignite control module, for utilize described gasoline layering lean combustion during the stage after gasoline combustion the heat of waste gas in described recompression stroke, expansion stroke and exhaust stroke process again, to the vapour in-cylinder injection diesel oil of described internal-combustion engine, so that described internal-combustion engine utilizes described diesel oil to do work.
According to the control system of the internal-combustion engine of the embodiment of the present invention, adopt the two stage combustion pattern of gasoline layering lean combustion and diesel oil compression ignite, in the gasoline layering lean combustion stage, can reduce the pumping loss of motor, the compression of raising motor is the ratio of specific heat of products of combustion when, improves the thermal efficiency, in the diesel oil compression ignite stage, by the control to diesel injection number of times and oil spout phase place, can in expansion stroke and recompression stroke, carry out repeatedly or single injection event fuel oil.By two stage combustion, the final air fuel ratio of mixture that keeps is near chemically correct fuel, in the time of can solving gasoline layering lean combustion, motor produces the problem of too high NOx, motor is done merit twice in a work cycle, improve specific power, and when improving specific power, reduced the idling speed of motor and the engine speed under output Same Efficieney, thereby reduced engine friction, improved fuel economy.
In addition, the control system of internal-combustion engine according to the above embodiment of the present invention can also have following additional technical characteristics:
In some instances, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is less than the operating mode of the first default load, described gasoline layering lean combustion control module adopts secondary injection gasoline pattern, described diesel oil compression ignite control module adopts the pre-spray of diesel oil and main jet pattern, wherein, injected petrol phase place SOI=is (250 ° for the first time, 350 °) CA BTDC, injected petrol phase place EOI=is (40 ° for the second time, 55 °) CA BTDC, firing angle=(25 °, 40 °), injected petrol amount for the first time: injected petrol amount=3:2 for the second time, the λ that closes on spark plug is greater than 1, diesel oil sprays phase place EOI in advance
1=(2000 °, 250 °) CA ATDC, diesel oil main jet phase place EOI
2=(340 °, 350 °) CA ATDC, diesel oil main jet amount: the pre-discharge rate=2:1 of diesel oil.
In some instances, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the described first default load and is less than the operating mode of the second default load, described gasoline layering lean combustion control module adopts secondary injection gasoline pattern, described diesel oil compression ignite control module adopts a diesel injection pattern, wherein, the described second default load is greater than the described first default load, wherein, and injected petrol phase place SOI for the first time
1=(300 °, 350 °) CA BTDC, for the second time injected petrol phase place SOI
2=(200 °, 150 °) CA BTDC, for the first time injected petrol amount: injected petrol amount=1:2 for the second time, closes on λ=20 of spark plug; Diesel injection phase place oil spout phase place EOI=(320 °, 340 °) CA ATDC.
In some instances, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the operating mode of the described second default load, described diesel oil compression ignite control module adopts multi-injection mode to carry out diesel oil compression ignite or described gasoline layering lean combustion control module and adopts multi-injection mode to carry out gasoline to light, wherein, when carrying out diesel oil compression ignite, main jet oil spout phase place SOI is later than or equals compression top center front 30 for the second time and spends, main jet oil spout phase place EOI early than or equal for the second time 20 degree after compression top center, when carrying out gasoline while lighting, described λ≤1, and light a fire when described recompression stroke, wherein, the described the 3rd default load is greater than the described second default load.
The embodiment of third aspect present invention discloses a kind of vehicle, comprising: internal-combustion engine; Control system with internal-combustion engine as described in above-described embodiment.This vehicle can improve fuel economy, and can effectively reduce the discharge amount of exhaust pollutant.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming embodiment's description, wherein:
Fig. 1 is the fundamental diagram of a work cycle of internal-combustion engine in the controlling method of internal-combustion engine according to an embodiment of the invention;
Fig. 2 is the flow chart of the controlling method of internal-combustion engine according to an embodiment of the invention; And
Fig. 3 is the structured flowchart of the control system of internal-combustion engine according to an embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, described embodiment's example is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment who is described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " be only for describing object, and can not be interpreted as indication or hint relative importance.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
Below in conjunction with accompanying drawing, describe according to the controlling method of the internal-combustion engine of the embodiment of the present invention, system and vehicle.
In description of the invention, term internal-combustion engine refers to duel fuel engine, the diesel oil ignited motor of gasoline premix for example, and this internal-combustion engine is usingd gasoline and diesel oil as fuel.This internal-combustion engine is 6-stroke IC engine, as shown in Figure 1, is the fundamental diagram of a work cycle of the internal-combustion engine in the embodiment of the present invention.As shown in Figure 1, each work cycle of internal-combustion engine comprises following six strokes, that is: aspirating stroke, compression stroke, expansion stroke, recompression stroke, expansion stroke and exhaust stroke again.
As shown in Figure 2, the controlling method of internal-combustion engine, comprising: in two stages of gasoline layering lean combustion and diesel oil compression ignite, each work cycle of internal-combustion engine comprises two stage combustion according to an embodiment of the invention, first paragraph is gasoline layering lean combustion, and second segment is diesel oil compression ignite.
Wherein, in the gasoline layering lean combustion stage, comprise: in aspirating stroke, compression stroke and expansion stroke process, to injected petrol in the cylinder of internal-combustion engine, so that internal-combustion engine utilizes gasoline to do work, wherein, the air fuel ratio of gas mixture is between first threshold and Second Threshold, and first threshold is less than described Second Threshold.In one embodiment of the invention, first threshold for but be not limited to 25, Second Threshold for but be not limited to 40.
Specifically, comprising: step S201, in the first stage of gasoline layering lean combustion, requires the air fuel ratio of gas mixture: 25 < air fuel ratio < 40.Adopt layering lean combustion, there is no pumping loss (being that closure can keep 100% aperture), can adopt the piston of high compression ratio, in order to improve the thermal efficiency, adopt the compression ratio higher than conventional motor, for example compression ratio is greater than 11, the working principle of application miller cycle, controls the opening and closing of inlet and exhaust valve constantly, increases expansion ratio, the product ratio of specific heat of gasoline layering lean combustion is high, can improve the thermal efficiency.
Step S202, in the second stage of diesel oil compression ignite, utilize gasoline layering lean combustion during the stage after gasoline combustion the heat of waste gas in recompression stroke, expansion stroke and exhaust stroke process again, to the vapour in-cylinder injection diesel oil of internal-combustion engine, so that internal-combustion engine utilizes diesel oil to do work.
Specifically, the principle that second segment sprays diesel oil is as follows, in recompression stroke after the first stage of gasoline layering lean combustion completes, waste gas (be gasoline layering lean combustion during the stage after gasoline combustion waste gas) is compressed, can produce the pressurized gas of High Temperature High Pressure, more than compression pressure can reach 60bar, if in second stage injected petrol, spray back pressure very large, fuel oil spray-cone angle is very little, and fuel-injected runs through apart from diminishing, cause spraying accurate fuel injection quantity, first stage carries out gasoline spraying injection pressure and cannot match with second stage gasoline spraying injection pressure, be that the injection pressure of second segment injection and the injection pressure of first paragraph can not effectively regulate in a work cycle of motor operation.And at height, spray under back pressure, gasoline cannot scatter, and fuel oil cannot evenly mix with air, causes burning.Therefore, the method of the embodiment of the present invention adopts diesel oil compression ignite in second stage, can adopt the diesel injection mode of high-pressure common rail, by at second stage inject high pressure diesel oil, because diesel injection pressure is high, angle of apray is large, can solve the problem that the injection of second stage gasoline cannot be scattered, fuel-oil atmozation is poor.And can effectively solve motor in the fuel combustion in two stages the demand to injection pressure.
In second stage, spray diesel oil, utilize first stage high-temp waste gas can accelerate mixing of diesel oil molecules and air in cylinder, increase rate of burning.By making full use of the energy of the waste gas that the first stage produces, can solve diesel engine cold-starting slow or cannot starting problem.
The method of the embodiment of the present invention is by adopting gasoline layering lean-burn (being the gasoline layering lean combustion stage) and adopting diesel oil compression ignite in second stage in the first stage, motor is done work twice in a work cycle, greatly improved the specific power of motor, by making full use of the energy of the waste gas of first stage generation, second stage diesel oil compression ignite can fully be burnt, improved the thermal efficiency of motor.
It should be noted that, in the first stage, carry out gasoline layering lean combustion and second stage is carried out diesel oil compression ignite, require the air fuel ratio of final mixed gas to be not more than homogeneous charge air fuel ratio.
Certainly, motor is when different operating mode, and the number of times of two stage injected petrol of gasoline layering lean combustion and diesel oil compression ignite and injection diesel oil etc. there are differences.
For example: when internal-combustion engine is when rotating speed is less than the first preset rotation speed (middle and slow speed of revolution on ordinary meaning) and load and is less than the operating mode of the first default load (low-load on ordinary meaning), in the gasoline layering lean combustion stage, adopt secondary injection gasoline pattern, the diesel oil compression ignite stage adopts the pre-spray of diesel oil and main jet pattern, wherein, injected petrol phase place SOI=is (250 ° for the first time, 350 °) CA BTDC, injected petrol phase place EOI=is (40 ° for the second time, 55 °) CA BTDC, firing angle=(25 °, 40 °), injected petrol amount for the first time: injected petrol amount=3:2 for the second time, the λ that closes on spark plug is greater than 1, meeting mixed gas can smooth combustion, diesel oil sprays phase place EOI in advance
1=(2000 °, 250 °) CA ATDC, diesel oil main jet phase place EOI
2=(340 °, 350 °) CA ATDC, diesel oil main jet amount: the pre-discharge rate=2:1 of diesel oil is pre-spray for the first time, is main jet for the second time, and requires emitted dose for the second time: emitted dose=2:1 for the first time.Spray and mainly utilize cylinder temperature to carry out cracking to diesel oil for the first time, reduced cylinder temperature simultaneously, spray and can not exceed the oil spout phase place of regulation for the second time, otherwise cause compressing negative work, increase.
That is to say, motor is when middle and slow speed of revolution, running on the lower load, there is requirement in the air fuel ratio to first stage gasoline layering lean combustion, particularly, for meeting motor in middle and slow speed of revolution, the requirement of low-load to fuel economy, need: 25 < air fuel ratio < 40, like this, can make full use of the potentiality that oil consumption falls in layering lean combustion, after gasoline air mixture ratio > 40, can make cyclical variations in engine power output reduction, cylinder increase rapidly, fuel oil consumption sharply increases.
In addition, when internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the first default load and is less than the operating mode of the second default load (moderate duty on ordinary meaning), in the gasoline layering lean combustion stage, adopt secondary injection gasoline pattern, the diesel oil compression ignite stage adopts a diesel injection pattern, wherein, the second default load is greater than the first default load, wherein, and injected petrol phase place SOI for the first time
1=(300 °, 350 °) CA BTDC, for the second time injected petrol phase place SOI
2=(200 °, 150 °) CA BTDC, for the first time injected petrol amount: injected petrol amount=1:2 for the second time, closes on λ=20 of spark plug; Diesel injection phase place oil spout phase place EOI=(320 °, 340 °) CA ATDC.For complete to high load working condition excessively, due to the minimizing of fresh charge, diesel oil can only spray once simultaneously.
That is to say, motor, when middle and slow speed of revolution, moderate duty operating mode, requires λ=20, and along with the raising of engine load, the detonation of motor tendency is larger, for engine load, excessively provides condition.
For another example: when internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the operating mode of the second default load (the large load on ordinary meaning), employing multi-injection mode carries out diesel oil compression ignite or gasoline is lighted, wherein, when carrying out diesel oil compression ignite, main jet oil spout phase place SOI is later than or equals compression top center front 30 for the second time and spends, main jet oil spout phase place EOI early than or equal for the second time 20 degree after compression top center, when carrying out gasoline while lighting, described λ≤1, and light a fire when recompression stroke, wherein, the 3rd default load is greater than the described second default load.
That is to say, when motor middle and slow speed of revolution, high load working condition, can only carry out diesel oil compression ignite or gasoline and light, just can meet the demand of motor to moment of torsion output.Certainly, can carry out multi-injection.For example: if carry out diesel oil compression ignite, require the motor main jet oil spout phase place SOI must not be early than 30 degree before compression top center for the second time, EOI must not be later than for the second time 20 degree after compression top center.If carry out gasoline, light, require mixed gas λ≤1, and can only near second compression stroke, light a fire.
In the foregoing description, term ratio of specific heat: internal-combustion engine isentropic exponent, SOI: fuel injection beginning constantly, EOI: end of injection constantly, BTDC: before compression top center, ATDC: after compression top center, injection back pressure: injected fuel in-cylinder pressure, lean combustion constantly: the air fuel ratio of the mixed gas of fuel and air is greater than the burning of chemically correct fuel, pumping loss: motor is in intake process, pressure in suction tude is less than restriction loss that atmospheric pressure brings, runs through distance: when fuel oil sprays, oil spout oil droplet is apart from the distance of nozzle.
According to the controlling method of the internal-combustion engine of the embodiment of the present invention, adopt the two stage combustion pattern of gasoline layering lean combustion and diesel oil compression ignite, in the gasoline layering lean combustion stage, can reduce the pumping loss of motor, the compression of raising motor is the ratio of specific heat of products of combustion when, improves the thermal efficiency, in the diesel oil compression ignite stage, by the control to diesel injection number of times and oil spout phase place, can in expansion stroke and recompression stroke, carry out repeatedly or single injection event fuel oil.By two stage combustion, the final air fuel ratio of mixture that keeps is near chemically correct fuel, in the time of can solving gasoline layering lean combustion, motor produces the problem of too high NOx, motor is done merit twice in a work cycle, improve specific power, and when improving specific power, reduced the idling speed of motor and the engine speed under output Same Efficieney, thereby reduced engine friction, improved fuel economy.
As shown in Figure 3, the control system 300 according to an embodiment's of invention internal-combustion engine, comprising: gasoline layering lean combustion control module 310 and diesel oil compression ignite control module 320.
Wherein, gasoline layering lean combustion control module 310 is in aspirating stroke, compression stroke and expansion stroke process, to injected petrol in the cylinder of internal-combustion engine, so that internal-combustion engine utilizes gasoline to do work, wherein, the air fuel ratio of gas mixture is between first threshold and Second Threshold, and first threshold is less than Second Threshold.Diesel oil compression ignite control module 320 for utilize gasoline layering lean combustion during the stage after gasoline combustion the heat of waste gas in recompression stroke, expansion stroke and exhaust stroke process again, to the vapour in-cylinder injection diesel oil of internal-combustion engine, so that internal-combustion engine utilizes diesel oil to do work.
As a concrete example, when internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is less than the operating mode of the first default load, gasoline layering lean combustion control module 310 adopts secondary injection gasoline pattern, diesel oil compression ignite control module 320 adopts the pre-spray of diesel oil and main jet pattern, wherein, injected petrol phase place SOI=is (250 ° for the first time, 350 °) CA BTDC, injected petrol phase place EOI=is (40 ° for the second time, 55 °) CA BTDC, firing angle=(25 °, 40 °), injected petrol amount for the first time: injected petrol amount=3:2 for the second time, the λ that closes on spark plug is greater than 1, diesel oil sprays phase place EOI in advance
1=(2000 °, 250 °) CAATDC, diesel oil main jet phase place EOI
2=(340 °, 350 °) CA ATDC, diesel oil main jet amount: the pre-discharge rate=2:1 of diesel oil.
In addition, when internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the first default load and is less than the operating mode of the second default load, gasoline layering lean combustion control module 310 adopts secondary injection gasoline pattern, diesel oil compression ignite control module 320 adopts a diesel injection pattern, wherein, the second default load is greater than the described first default load, wherein, and injected petrol phase place SOI for the first time
1=(300 °, 350 °) CA BTDC, for the second time injected petrol phase place SOI
2=(200 °, 150 °) CA BTDC, for the first time injected petrol amount: injected petrol amount=1:2 for the second time, closes on λ=20 of spark plug; Diesel injection phase place oil spout phase place EOI=(320 °, 340 °) CA ATDC.
For another example, when internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the operating mode of the second default load, diesel oil compression ignite control module 320 adopts multi-injection modes to carry out diesel oil compression ignite or gasoline layering lean combustion control module 310 and adopts multi-injection modes to carry out gasoline to light, wherein, when carrying out diesel oil compression ignite, main jet oil spout phase place SOI is later than or equals compression top center front 30 for the second time and spends, main jet oil spout phase place EOI early than or equal for the second time 20 degree after compression top center, when carrying out gasoline while lighting, λ≤1, and light a fire when recompression stroke, wherein, the 3rd default load is greater than the second default load.
According to the control system of the internal-combustion engine of the embodiment of the present invention, adopt the two stage combustion pattern of gasoline layering lean combustion and diesel oil compression ignite, in the gasoline layering lean combustion stage, can reduce the pumping loss of motor, the compression of raising motor is the ratio of specific heat of products of combustion when, improves the thermal efficiency, in the diesel oil compression ignite stage, by the control to diesel injection number of times and oil spout phase place, can in expansion stroke and recompression stroke, carry out repeatedly or single injection event fuel oil.By two stage combustion, the final air fuel ratio of mixture that keeps is near chemically correct fuel, in the time of can solving gasoline layering lean combustion, motor produces the problem of too high NOx, motor is done merit twice in a work cycle, improve specific power, and when improving specific power, reduced the idling speed of motor and the engine speed under output Same Efficieney, thereby reduced engine friction, improved fuel economy.
Be understandable that, the specific implementation of the specific implementation of the system of the embodiment of the present invention and method part is similar, and the specific implementation of components of system as directed refers to the description of method part, and in order to reduce redundancy, number of times does not repeat.
Further embodiment of the present invention provides a kind of vehicle, comprising: the control system of the internal-combustion engine described in internal-combustion engine and above-described embodiment.This vehicle can improve fuel economy, and can effectively reduce the discharge amount of exhaust pollutant.
In addition, according to other formation of the vehicle of the embodiment of the present invention and effect, be all known to those skilled in the art, in order to reduce redundancy, do not repeat herein.
In the description of this specification, the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiments or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiments, scope of the present invention is by claim and be equal to and limit.
Claims (10)
1. a controlling method for internal-combustion engine, is characterized in that, each work cycle of described internal-combustion engine comprises: aspirating stroke, compression stroke, expansion stroke, recompression stroke, expansion stroke and exhaust stroke again, said method comprising the steps of:
The gasoline layering lean combustion stage: in described aspirating stroke, compression stroke and expansion stroke process, to injected petrol in the cylinder of described internal-combustion engine, so that described internal-combustion engine utilizes described gasoline to do work, wherein, the air fuel ratio of described gas mixture is between first threshold and Second Threshold, and described first threshold is less than described Second Threshold;
The diesel oil compression ignite stage: utilize described gasoline layering lean combustion during the stage after gasoline combustion the heat of waste gas in described recompression stroke, expansion stroke and exhaust stroke process again, to the vapour in-cylinder injection diesel oil of described internal-combustion engine, so that described internal-combustion engine utilizes described diesel oil to do work.
2. method according to claim 1, it is characterized in that, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is less than the operating mode of the first default load, in the described gasoline layering lean combustion stage, adopt secondary injection gasoline pattern, the described diesel oil compression ignite stage adopts the pre-spray of diesel oil and main jet pattern
Wherein, injected petrol phase place SOI=(250 °, 350 °) CA BTDC for the first time, injected petrol phase place EOI=(40 °, 55 °) CA BTDC for the second time, firing angle=(25 °, 40 °), injected petrol amount for the first time: injected petrol amount=3:2 for the second time, closes on and is greater than 1;
Diesel oil sprays phase place EOI in advance
1=(2000 °, 250 °) CA ATDC, diesel oil main jet phase place EOI
2=(340 °, 350 °) CA ATDC, diesel oil main jet amount: the pre-discharge rate=2:1 of diesel oil.
3. method according to claim 2, it is characterized in that, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the described first default load and is less than the operating mode of the second default load, in the described gasoline layering lean combustion stage, adopt secondary injection gasoline pattern, the described diesel oil compression ignite stage adopts a diesel injection pattern, wherein, the described second default load is greater than the described first default load
Wherein, injected petrol phase place SOI for the first time
1=(300 °, 350 °) CA BTDC, for the second time injected petrol phase place SOI
2=(200 °, 150 °) CA BTDC, for the first time injected petrol amount: injected petrol amount=1:2 for the second time, closes on λ=20 of spark plug;
Diesel injection phase place oil spout phase place EOI=(320 °, 340 °) CA ATDC.
4. method according to claim 3, it is characterized in that, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the operating mode of the described second default load, employing multi-injection mode carries out diesel oil compression ignite or gasoline is lighted, wherein, when carrying out diesel oil compression ignite, main jet oil spout phase place SOI is later than or equals compression top center front 30 for the second time and spends, main jet oil spout phase place EOI early than or equal for the second time 20 degree after compression top center, when carrying out gasoline while lighting, described λ≤1, and light a fire when described recompression stroke, wherein, the described the 3rd default load is greater than the described second default load.
5. according to the method described in claim 1-4 any one, it is characterized in that, described first threshold is 25, and described Second Threshold is 40.
6. a control system for internal-combustion engine, is characterized in that, each work cycle of described internal-combustion engine comprises: aspirating stroke, compression stroke, expansion stroke, recompression stroke, expansion stroke and exhaust stroke again, and described system comprises:
Gasoline layering lean combustion control module, be used in described aspirating stroke, compression stroke and expansion stroke process, to injected petrol in the cylinder of described internal-combustion engine, so that described internal-combustion engine utilizes described gasoline to do work, wherein, the air fuel ratio of described gas mixture is between first threshold and Second Threshold, and described first threshold is less than described Second Threshold;
Diesel oil compression ignite control module, for utilize described gasoline layering lean combustion during the stage after gasoline combustion the heat of waste gas in described recompression stroke, expansion stroke and exhaust stroke process again, to the vapour in-cylinder injection diesel oil of described internal-combustion engine, so that described internal-combustion engine utilizes described diesel oil to do work.
7. system according to claim 6, it is characterized in that, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is less than the operating mode of the first default load, described gasoline layering lean combustion control module adopts secondary injection gasoline pattern, described diesel oil compression ignite control module adopts the pre-spray of diesel oil and main jet pattern
Wherein, injected petrol phase place SOI=is (250 ° for the first time, 350 °) CA BTDC, injected petrol phase place EOI=is (40 ° for the second time, 55 °) CA BTDC, firing angle=(25 °, 40 °), injected petrol amount for the first time: injected petrol amount=3:2 for the second time, the λ that closes on spark plug is greater than 1;
Diesel oil sprays phase place EOI in advance
1=(2000 °, 250 °) CA ATDC, diesel oil main jet phase place EOI
2=(340 °, 350 °) CA ATDC, diesel oil main jet amount: the pre-discharge rate=2:1 of diesel oil.
8. system according to claim 7, it is characterized in that, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the described first default load and is less than the operating mode of the second default load, described gasoline layering lean combustion control module adopts secondary injection gasoline pattern, described diesel oil compression ignite control module adopts a diesel injection pattern, wherein, the described second default load is greater than the described first default load
Wherein, injected petrol phase place SOI for the first time
1=(300 °, 350 °) CA BTDC, for the second time injected petrol phase place SOI
2=(200 °, 150 °) CA BTDC, for the first time injected petrol amount: injected petrol amount=1:2 for the second time, closes on λ=20 of spark plug;
Diesel injection phase place oil spout phase place EOI=(320 °, 340 °) CA ATDC.
9. method according to claim 8, it is characterized in that, when described internal-combustion engine is when rotating speed is less than the first preset rotation speed and load and is greater than the operating mode of the described second default load, described diesel oil compression ignite control module adopts multi-injection mode to carry out diesel oil compression ignite or described gasoline layering lean combustion control module and adopts multi-injection mode to carry out gasoline to light, wherein, when carrying out diesel oil compression ignite, main jet oil spout phase place SOI is later than or equals compression top center front 30 for the second time and spends, main jet oil spout phase place EOI early than or equal for the second time 20 degree after compression top center, when carrying out gasoline while lighting, described λ≤1, and light a fire when described recompression stroke, wherein, the described the 3rd default load is greater than the described second default load.
10. a vehicle, is characterized in that, comprising:
Internal-combustion engine; With
The control system of the internal-combustion engine as described in claim 6-9 any one.
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