CN104179600A - Auxiliary injection method and system for air and exhaust gas of gasoline direct injection engine - Google Patents
Auxiliary injection method and system for air and exhaust gas of gasoline direct injection engine Download PDFInfo
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- CN104179600A CN104179600A CN201310200829.1A CN201310200829A CN104179600A CN 104179600 A CN104179600 A CN 104179600A CN 201310200829 A CN201310200829 A CN 201310200829A CN 104179600 A CN104179600 A CN 104179600A
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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
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses an auxiliary injection method and system for air and exhaust gas of gasoline direct injection engine. The method comprises the following steps that air and exhaust gas led out of an engine exhaust system are mixed with fuel to form a fuel gas mixture, and the fuel gas mixture is injected into an engine cylinder through gas burner in the engine cylinder for combustion. The system comprises a cylinder, a gas nozzle, a fuel tank, an exhaust pipe, an oil and gas mixing device, a fuel pump, an exhaust gas pump, an air pump and an oil gas pump, wherein the fuel tank is connected with the oil and gas mixing device through an oil delivery pipeline, and the exhaust pipe is connected with the oil and gas mixing device through the exhaust gas pipeline; the air pump is connected with the oil and gas mixing device through an air pipeline, and the oil and gas mixing device is connected with the gas nozzle through the oil gas pipeline. According to the auxiliary injection method and system provided by the invention, the quality of injected oil mist is improved, and the carbon smoke emission of the engine is reduced, the burning effect is optimized, and the burning stability is improved.
Description
Technical field
The present invention relates to direct injection technology in engine cylinder, be specifically related to a kind of secondary injection method and system of utilizing air and cylinder waste gas and fuel oil to be pre-mixed.
Background technique
Gasoline in-cylinder direct injection technology is to improve the important means of gasoline engine fuel Economy.The combustion method of the gasoline in-cylinder direct injection technology of having applied at present is mainly divided into two kinds, i.e. layering lean combustion and the burning of homogeneous equivalent proportion.First generation direct spray petrol engine in cylinder adopts layering lean combustion mode, owing to having improved specific heat ratio and having reduced pumping loss, therefore increase substantially fuel economy.But three-way catalyst can not solve the too high problem of the nitrogen oxide in waste gas under lean mode, and can cause the carbon smoke exhaust problem higher than traditional intake port injection.In view of above problem, the GDI petrol engine of industrialization at present adopts homogeneous equivalent proportion combustion manner mostly, but owing to cannot adopting layering lean combustion, under sub load, still exist larger pumping loss that oil-saving effect is weakened, even and adopting equivalent proportion combustion mode, the secondary injection strategy of taking in cold start-up operating mode and for the pinking that suppresses to load greatly also can be because stratified mixture combustion brings carbon smoke exhaust problem.
For addressing the above problem, more existing enterprises start to explore the method for air-assisted injection, after mixing with fresh air in advance by fuel oil, spray in cylinder, can effectively promote the atomization and vaporization of fuel oil, but atomization quality still has much room for improvement, and also have that oil spout is difficult to quantitatively, the uppity problem of air fuel ratio.
Summary of the invention
The object of the present invention is to provide a kind of direct spray petrol engine in cylinder air and waste gas secondary injection method and system, to improve engine spray mist of oil quality, improve engine combustion stability.
Direct spray petrol engine in cylinder air and waste gas secondary injection method of the present invention, comprises the steps:
The waste gas of drawing by air, from engine exhaust system and fuel oil are mixed to form fuel mixture mutually;
Fuel mixture is sprayed into cylinder and burns by being positioned at the gas nozzle of cylinder.
Further, the fuel mixture that described mixing forms afterwards sprays in cylinder in aspirating stroke, or sprays in cylinder in compression stroke, or in aspirating stroke and compression stroke, sprays in cylinder respectively.
Motor is in running, and fuel oil burns with chemically correct fuel.
Described waste gas and air are in the time mixing with fuel oil, and the eddy current that waste gas and air form rotation mixes with fuel oil.
Further, fuel oil first mixes with described waste gas, then introduces air and mix.
Direct spray petrol engine in cylinder air and waste gas secondary injection system, comprise cylinder, gas nozzle, fuel tank, outlet pipe, oil gas mixing unit, fuel pump, waste gas pump, air pump and oil gas pump, fuel tank is connected with oil gas mixing unit by oil transport pipeline, fuel pump is arranged on oil transport pipeline, outlet pipe is connected with oil gas mixing unit by exhaust piping, waste gas pump is arranged on exhaust piping, air pump is connected with oil gas mixing unit by air conduit, oil gas mixing unit is connected with gas nozzle by oil and gas pipes, and oil gas pump is arranged on oil and gas pipes.
Further, quantity control valve is installed on oil transport pipeline, waste gas gas coutrol valve is installed on exhaust piping, air gas coutrol valve is installed on air conduit.
Described oil gas mixing unit has cylindrical chamber, and waste gas and air enter along cylindrical cavity chamber surface tangent direction, form atwirl eddy current therein.
Beneficial effect of the present invention is as follows:
1, the present invention is by the premixing before waste gas and air and fuel oil are sprayed, on the one hand because the temperature of waste gas is higher, make the fuel oil flash evaporation of mixing with it and evenly mix with waste gas, therefore compared with existing fuel direct injection or air-assisted injection, the present invention has better atomization quality, its air-fuel mixture effect, gasification result are significantly improved, and therefore can effectively reduce motor carbon smoke exhaust and improve firing effect; On the other hand, by with the mixing of fresh air, thereby improved the combustion stability of fuel mixture, reduced fire loss ratio, reduced circular wave.
2, under the medium and small load of motor, the high-temp waste gas of introducing not only has the effect of volume dilution, also has the effect of temperature dilution, reduces pumping loss thereby can dilute cylinder charge; Under the large load of motor, the waste gas of introducing can reduce velocity of combustion, reaches the effect that suppresses pinking.
3, by adjusting fuel oil, air and waste gas three's ratio, can further optimize atomization quality and combustion characteristic, for strengthening ejecting system precision, improving engine operation efficiency significance.
Brief description of the drawings
Fig. 1 is the structural representation of direct spray petrol engine in cylinder air and waste gas secondary injection system of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further elaborated:
Direct spray petrol engine in cylinder air and waste gas secondary injection method, comprises the steps:
From engine exhaust system, extension waste gas mixes with fuel oil, and waste gas is in the time mixing with fuel oil, and the eddy current that waste gas forms rotation mixes with fuel oil;
The mixed gas of introducing again ozone and waste gas and fuel oil is mixed to form fuel mixture, and in the time mixing, the eddy current that air forms rotation fully mixes with the mixed gas of waste gas and fuel oil;
Fuel mixture is sprayed into cylinder in aspirating stroke and burns by being arranged in the gas nozzle of cylinder, to form homogeneous equivalent proportion mixed gas form, or burn in spraying in cylinder in compression stroke, be formed near denseer stratified mixtures form spark plug, or burn in spraying in cylinder in aspirating stroke and compression stroke respectively, with denseer near formation spark plug, the stratified mixtures form rarer around, dense rare region all mixes;
Motor is in running, and fuel oil burns with chemically correct fuel, and the i.e. 1 kilogram of fuel oil perfect combustion of chemically correct fuel need to consume the air of 14.7 kilograms.
Direct spray petrol engine in cylinder air and waste gas secondary injection system as shown in Figure 1, comprise cylinder, gas nozzle 1, fuel tank 2, outlet pipe 3, oil gas mixing unit 4, fuel pump 8, waste gas pump 6, air pump 10 and oil gas pump 5, this cylinder bore is 80mm, compression ratio is 10, fuel tank 2 is connected with oil gas mixing unit 4 by oil transport pipeline 12, fuel pump 8 is arranged on oil transport pipeline 12, quantity control valve 9 is also installed on oil transport pipeline 12, it is between oil gas mixing unit 4 and fuel pump 8, outlet pipe 3 is connected with oil gas mixing unit 4 by exhaust piping 13, waste gas pump 6 is arranged on exhaust piping 13, waste gas gas coutrol valve 7 is also installed on exhaust piping 13, it is between oil gas mixing unit 4 and waste gas pump 6, air pump 10 is connected with oil gas mixing unit 4 by air conduit 14, air gas coutrol valve 11 is installed on air conduit 14, it is between air pump 10 and oil gas mixing unit 4, oil gas mixing unit 4 is connected with gas nozzle 1 by oil and gas pipes 15, oil gas pump 5 is arranged on oil and gas pipes 15, described oil gas mixing unit 4 has cylindrical chamber, waste gas and air enter along cylindrical cavity chamber surface tangent direction, form atwirl eddy current therein.
Claims (8)
1. a direct spray petrol engine in cylinder air and waste gas secondary injection method, is characterized in that: comprise the steps:
The waste gas of drawing by air, from engine exhaust system and fuel oil are mixed to form fuel mixture mutually;
Fuel mixture is sprayed into cylinder and burns by being positioned at the gas nozzle of cylinder.
2. direct spray petrol engine in cylinder air and waste gas secondary injection method according to claim 1, it is characterized in that: the fuel mixture that described mixing forms afterwards sprays in cylinder in aspirating stroke, or in compression stroke, spray in cylinder, or in aspirating stroke and compression stroke, spray in cylinder respectively.
3. direct spray petrol engine in cylinder air and waste gas secondary injection method according to claim 1, is characterized in that: motor is in running, and fuel oil burns with chemically correct fuel.
4. direct spray petrol engine in cylinder air and waste gas secondary injection method according to claim 1, is characterized in that: described waste gas and air are in the time mixing with fuel oil, and the eddy current that waste gas and air form rotation mixes with fuel oil.
5. according to arbitrary described direct spray petrol engine in cylinder air and waste gas secondary injection method in claim 1 to 4, it is characterized in that: fuel oil first mixes with described waste gas, then introduces air and mix.
6. a direct spray petrol engine in cylinder air and waste gas secondary injection system, comprise cylinder, gas nozzle (1), fuel tank (2) and outlet pipe (3), it is characterized in that: also comprise oil gas mixing unit (4), fuel pump (8), waste gas pump (6), air pump (10) and oil gas pump (5), fuel tank is connected with oil gas mixing unit by oil transport pipeline (12), fuel pump is arranged on oil transport pipeline, outlet pipe is connected with oil gas mixing unit by exhaust piping (13), waste gas pump is arranged on exhaust piping, air pump is connected with oil gas mixing unit by air conduit (14), oil gas mixing unit is connected with gas nozzle by oil and gas pipes (15), oil gas pump is arranged on oil and gas pipes.
7. direct spray petrol engine in cylinder air and waste gas secondary injection system according to claim 6, it is characterized in that: quantity control valve (9) is installed on oil transport pipeline (12), waste gas gas coutrol valve (7) is installed on exhaust piping (13), air gas coutrol valve (11) is installed on air conduit (14).
8. according to the direct spray petrol engine in cylinder air and waste gas secondary injection system described in claim 6 or 7, it is characterized in that: described oil gas mixing unit (4) has cylindrical chamber, waste gas and air enter along cylindrical cavity chamber surface tangent direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310200829.1A CN104179600A (en) | 2013-05-27 | 2013-05-27 | Auxiliary injection method and system for air and exhaust gas of gasoline direct injection engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310200829.1A CN104179600A (en) | 2013-05-27 | 2013-05-27 | Auxiliary injection method and system for air and exhaust gas of gasoline direct injection engine |
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| CN104179600A true CN104179600A (en) | 2014-12-03 |
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| CN201310200829.1A Pending CN104179600A (en) | 2013-05-27 | 2013-05-27 | Auxiliary injection method and system for air and exhaust gas of gasoline direct injection engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109184962A (en) * | 2018-09-27 | 2019-01-11 | 潍柴重机股份有限公司 | Exhaust gas in-cylinder direct-jet turbulent combustion system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020162544A1 (en) * | 2001-04-18 | 2002-11-07 | Cho Gyu Baek | Exhaust gas assisted fuel injection system for internal combustion engine |
| JP2008180087A (en) * | 2007-01-23 | 2008-08-07 | Mazda Motor Corp | Exhaust gas recirculation device of direct injection type engine |
| CN101761423A (en) * | 2010-01-22 | 2010-06-30 | 重庆长安汽车股份有限公司 | Composite exhaust gas recycling device for gasoline engine |
-
2013
- 2013-05-27 CN CN201310200829.1A patent/CN104179600A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020162544A1 (en) * | 2001-04-18 | 2002-11-07 | Cho Gyu Baek | Exhaust gas assisted fuel injection system for internal combustion engine |
| JP2008180087A (en) * | 2007-01-23 | 2008-08-07 | Mazda Motor Corp | Exhaust gas recirculation device of direct injection type engine |
| CN101761423A (en) * | 2010-01-22 | 2010-06-30 | 重庆长安汽车股份有限公司 | Composite exhaust gas recycling device for gasoline engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109184962A (en) * | 2018-09-27 | 2019-01-11 | 潍柴重机股份有限公司 | Exhaust gas in-cylinder direct-jet turbulent combustion system and method |
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Application publication date: 20141203 |
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