CN102733944B - System and method for reducing emissions of nitric oxide and carbon smoke of diesel engine simultaneously - Google Patents
System and method for reducing emissions of nitric oxide and carbon smoke of diesel engine simultaneously Download PDFInfo
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- CN102733944B CN102733944B CN201210234926.8A CN201210234926A CN102733944B CN 102733944 B CN102733944 B CN 102733944B CN 201210234926 A CN201210234926 A CN 201210234926A CN 102733944 B CN102733944 B CN 102733944B
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Abstract
The invention discloses a system and a method used for reducing emissions of nitric oxide (NOx) and carbon smoke of a diesel engine simultaneously in the technical field of an internal combustion engine. Based on a common-rail exhaust gas recirculation electronic-control diesel engine, the original structural parts are not changed, and a new diesel-alcohol mixed fuel supply oil way is added; the new diesel-alcohol mixed fuel supply oil way comprises an alcohol fuel oil tank, an oil transfer pump, a flow control valve, and a fuel mixer with a liquid densimeter; the alcohol fuel oil tank is connected with an oil pump through the oil transfer pump, the flow control valve and the fuel mixer; the original diesel oil tank is respectively connected to a fuel oil mixer and the oil pump through an oil way switch valve; by adopting the control method of this system, the diesel supply oil way is used at the cold-starting and warming stages of the diesel engine, and is then switched to the diesel-alcohol mixed fuel supply oil way after the engine is heated, so that both the dynamic property and the economical efficiency of the diesel engine are guaranteed while the emissions of the carbon smoke and the NOx are obviously reduced, the use of an expensive tail gas post-processing system of the diesel engine is decreased; on the other hand, the good cold-starting performance of the alcohol-doped engine can be guaranteed.
Description
Technical field
What the present invention relates to is a kind of system and method for technical field of internal combustion engines, particularly a kind of system and method that simultaneously reduces diesel engine nitrogen oxide and carbon smoke exhaust.
Background technique
Along with the rising at full speed of Global Auto recoverable amount, the pollution that vehicle exhaust causes is day by day serious, impels researcher to be devoted to the research and development that motor vehicle exhaust emission purifies.Concerning diesel engine, nitrogen oxide (NO
x) and particle (being mainly soot) be its most important two kinds of noxious emissions, and between two kinds of effulents, exist relations (Trade-off) of a kind of these those length that disappear, reduce the rising that a kind of measure of effulent often brings another kind of effulent, this makes to reduce by two kinds of effulents simultaneously becomes a technical barrier.One of measure extensively adopting is at present by falling low NOx drainage in EGR (EGR) machine, then adopts diesel engine particles catcher (DPF) to carry out the reprocessing of particle; Another measure is to reduce the discharge of cylinder endoparticle by oil spout control, then carries out NO by catalytic reduction (SCR) optionally
xreduction processing.But no matter which kind of technology path, all can cause the remarkable increase of diesel engine vent gas after-treatment system cost.
On the other hand, the day by day deficient of petrochemical industry resource makes the research and development of novel automobile substitute fuel become one of hot spot technology.Aalcohols fuel, such as methyl alcohol, ethanol and butanols etc., due to its living beings source widely, and containing the feature of the clean fuels such as oxygen, receive the concern of countries in the world.There are some researches show, tradition fossil fuel, be gasoline and diesel oil, burn Aalcohols fuel and can significantly reduce its carbon smoke exhaust by mixing, this also for reducing to greatest extent harmful emission of diesel engine in machine, realize high-efficiency cleaning burning, the use that reduces the expensive exhaust gas aftertreatment system of diesel engine provides a direction.
Summary of the invention
Technological scheme of the present invention is as follows:
Reduce a system for diesel engine nitrogen oxide and carbon smoke exhaust simultaneously, comprise electronic control unit, the first fuel delivery oil circuit, the second fuel delivery oil circuit, oil circuit switching valve, oil pump, common rail pipe, oil sprayer and diesel engine; Oil pump, common rail pipe, oil sprayer and diesel engine are connected successively;
The first fuel delivery oil circuit comprises diesel oil tank and the first oil transfer pump, and the second fuel delivery oil circuit comprises Aalcohols fuel fuel tank, first flow control valve, second control valve, the second oil transfer pump, the 3rd oil transfer pump and fuel oil blender;
The first oil transfer pump, the second oil transfer pump and the 3rd oil transfer pump are separately positioned in diesel oil tank, Aalcohols fuel fuel tank and fuel oil blender; Oil circuit switching valve has three ports, joins respectively with delivery outlet, the inlet opening of first flow control valve and first inlet opening of oil pump of the first oil transfer pump; The second oil transfer pump and second control valve join; The output port of the output port of first flow control valve and second control valve is connected respectively to two input ports of fuel oil blender; The 3rd oil transportation delivery side of pump is connected with the second inlet opening of oil pump; First flow control valve is connected with Aalcohols fuel fuel tank with diesel oil tank with the second return tube by the first return tube respectively with second control valve;
Oil circuit switching valve, first flow control valve and second control valve are all controlled by electronic control unit;
On diesel engine, be provided with the temperature transducer for detection of cooling water temperature, be provided with liquid densitometer in fuel oil blender, temperature transducer and liquid densitometer all join with electronic control unit.
Reduce a method for diesel engine nitrogen oxide and carbon smoke exhaust simultaneously, described in adopting time, reduce the system of diesel engine nitrogen oxide and carbon smoke exhaust;
Operating mode 1: in the time that electronic control unit detects cooling water temperature lower than T, judge to be now diesel engine cold start and warm-up period, by oil circuit control switching valve, the first fuel delivery oil circuit is connected: the first oil transfer pump is communicated with the first inlet opening of oil pump by oil circuit switching valve, and not conducting between oil circuit switching valve and first flow control valve;
Operating mode 2: in the time that electronic control unit detects cooling water temperature higher than T, judge now for diesel engine completes warming-up, electronic control unit connects the second fuel delivery oil circuit by oil circuit control switching valve, the first oil transfer pump is by oil circuit switching valve and the conducting of first flow control valve, fuel oil in diesel oil tank and Aalcohols fuel fuel tank enters through first flow control valve and second control valve the second inlet opening that enters again oil pump after fuel oil blender mixes respectively, and the first oil transfer pump be cut off being connected of the first inlet opening of oil pump.
In described operating mode 2, fluid density value and the operating mode of electronic control unit based on liquid densitometer feedback, is stabilized between 0.81-0.83 fuel combination relative density by controlling first flow control valve and second control valve.
Described operating mode is determined by accelerator pedal position signal and tach signal.
Described T is 40-60 degree Celsius.
Described oil circuit switching valve has manual control mechanism.
In described Aalcohols fuel fuel tank, fuel comprises at least one in butanols, ethanol or methyl alcohol.
Beneficial effect
A kind of system and method that simultaneously reduces diesel engine nitrogen oxide and carbon smoke exhaust of the present invention, by increasing by a road fuel delivery oil circuit, can under the different starting states of diesel engine, use different oil circuits, use the diesel oil of former diesel engine to supply with oil circuit in cold starting and warm-up period, now not blending Aalcohols fuel, the engine cold starting stage that can avoid like this latent heat of vaporization that Aalcohols fuel is large and low cetane number to cause catches fire and discharges high problem with combustion instability, combustion efficiency poor, hydrocarbon (HC); After heat engine, motor is switched to diesel oil-ol class fuel combination according to cooling water temperature and supplies with oil circuit, the NOx significantly reducing in cylinder by EGR (EGR) system of former diesel engine generates, greatly reduce the Soot Formation in cylinder by the oxygen effect that contains of Aalcohols fuel on the other hand, reach in motor and significantly reduce NOx and soot source emission simultaneously, reduce the object that the expensive exhaust gas aftertreatment system of diesel engine uses; According to liquid densitometer Real-Time Monitoring fuel combination density, control the mixing proportion of Aalcohols fuel under different operating modes with this, to guarantee power character and the Economy of diesel engine; Substantially do not change original diesel engine structure, therefore both can guarantee the inheritance of former diesel oil supply oil circuit, can realize flexibly multiple Aalcohols fuel (methyl alcohol, ethanol and butanols) yet and mix burning with mixing of diesel oil.
This system and controlling method can guarantee on the basis of former engine power performance and Economy on the one hand, reduce significantly NOx and carbon smoke exhaust simultaneously, reduce the use of expensive after-treatment system, can also guarantee on the other hand to mix alcohol motor and there is good cold-start performance.
Accompanying drawing explanation
Fig. 1 structural representation of the present invention;
The pure diesel oil of Fig. 2 and the diesel oil-butanol mixed fuel carbon smoke exhaust comparison diagram that contains 40% butanols volume ratio;
The pure diesel oil of Fig. 3 discharges comparison diagram with the diesel oil-butanol mixed fuel NOx containing 40% butanols volume ratio.
Embodiment
Below embodiments of the invention are elaborated, this example is implemented under take technical solution of the present invention as prerequisite, provided detailed mode of execution and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, a kind of system that simultaneously reduces diesel engine nitrogen oxide and carbon smoke exhaust comprises, electronic control unit 11, the first fuel delivery oil circuit, the second fuel delivery oil circuit, oil circuit switching valve 3, oil pump 4, common rail pipe 6, oil sprayer 7 and diesel engine 1; Oil pump 4, common rail pipe 6, oil sprayer 7 and diesel engine 1 are connected successively;
The first fuel delivery oil circuit comprises that diesel oil tank 2 and the first oil transfer pump 14, the second fuel delivery oil circuits comprise Aalcohols fuel fuel tank 8, first flow control valve 17, second control valve 18, the second oil transfer pump 15, the 3rd oil transfer pump 16 and fuel oil blender 9;
The first oil transfer pump 14, the second oil transfer pump 15 and the 3rd oil transfer pump 16 are separately positioned in diesel oil tank 2, Aalcohols fuel fuel tank 8 and fuel oil blender 9; Oil circuit switching valve has three ports, joins respectively with delivery outlet, the inlet opening of first flow control valve 17 and first inlet opening of oil pump 4 of the first oil transfer pump 14; The second oil transfer pump 15 joins with second control valve 18; The output port of the output port of first flow control valve 17 and second control valve 18 is connected respectively to two input ports of fuel oil blender 9; The output terminal of the 3rd oil transfer pump 16 is connected with the second inlet opening of oil pump 4; First flow control valve 17 is connected with Aalcohols fuel fuel tank 8 with diesel oil tank 2 with the second reflow pipe 20 by the first reflow pipe 19 respectively with second control valve 18;
Oil circuit switching valve, first flow control valve and second control valve are all controlled by electronic control unit;
On diesel engine, be provided with the temperature transducer 5 for detection of cooling water temperature, be provided with liquid densitometer 10 in fuel oil blender, temperature transducer and liquid densitometer all join with electronic control unit.
In Aalcohols fuel fuel tank 8, be filled with butanols.
At diesel engine cold start and warm-up period, the cooling water temperature that electronic control unit 11 feeds back according to cooling-water temperature sensor 5, oil circuit control switching valve 3 is switched to the 1st road diesel oil and supplies with oil circuit, now the diesel fuel in diesel oil tank 2 is pumped by the first oil transfer pump 14, enter in oil pump 4 through oil circuit switching valve 3, and by sending into common rail pipe 6 after oil pump 4 pressurizations, the oil sprayer 7 of controlling finally by electronic control unit (ECU) 11 sprays into burning chamber of diesel engine.After heat engine, when detecting cooling water temperature, ECU11 raises, while equaling or exceeding 60 ℃, oil circuit control switching valve 3 is switched to the 2nd road diesel oil-ol class fuel combination and supplies with oil circuit, now diesel fuel is still pumped by diesel oil tank 2 by the first oil transfer pump 14, process oil circuit switching valve 3 and first flow control valve 17 enter the fuel oil blender 9 of carrying liqs densitometer 10, Aalcohols fuel (butanols) is pumped through second control valve 18 and enters fuel oil blender 9 from Aalcohols fuel fuel tank 8 by the second oil transfer pump 15, fuel combination density in the fuel oil blender 9 that ECU11 measures according to liquid densitometer 10, control second control valve 18 and regulate the Aalcohols fuel flow entering in fuel oil blender 9, to guarantee that diesel oil-ol class A fuel A mixed proportion changes within the scope of 0-60% with operating mode, corresponding fuel combination relative density changes between 0.83 to 0.81.For example, if fuel combination relative density is lower than 0.825 under the full load mode that liquid densitometer 10 is measured, electronic control unit (ECU) 11 judges that the Aalcohols fuel ratio in this operating mode fuel combination exceedes 20%, regulate second control valve 18 to reduce the Aalcohols fuel flow entering in fuel mixer 9, corresponding increase is simultaneously by the diesel oil flow of first flow control valve 17, and unnecessary Aalcohols fuel is got back in Aalcohols fuel fuel tank 8 through the second return tube 20 of second control valve 18.The diesel oil-ol class fuel combination mixing in fuel oil blender 9 is input to by the 3rd oil transfer pump 16 in the oil pump 4 of former machine, after pressurization, send into common rail pipe 6, the oil sprayer 7 of controlling finally by electronic control unit (ECU) 11 sprays into burning chamber of diesel engine carries out the compression ignition combustion of oxygen-containing blended fuel, lead in conjunction with the EGR of certain proportion (0-50%) that (gas recirculation system by former diesel engine is realized simultaneously, comprise gaseous effluent 12 and EGR valve 13), can in motor, significantly reduce nitrogen oxide the source emission more than more than 95% soot source emission and 90% of diesel engine simultaneously, realize the high-efficiency cleaning burning of diesel engine.
As shown in Figures 2 and 3, in employing the present embodiment, after system and method, in diesel engine, nitrogen oxide and carbon smoke exhaust have all obtained obvious reduction.
Claims (5)
1. a method that simultaneously reduces diesel engine nitrogen oxide and carbon smoke exhaust, is characterized in that, adopts a kind of system that simultaneously reduces diesel engine nitrogen oxide and carbon smoke exhaust;
The described system that simultaneously reduces diesel engine nitrogen oxide and carbon smoke exhaust comprises electronic control unit, the first fuel delivery oil circuit, the second fuel delivery oil circuit, oil circuit switching valve, high pressure oil pump, common rail pipe, oil sprayer and diesel engine; High pressure oil pump, common rail pipe, oil sprayer and diesel engine are connected successively;
The first fuel delivery oil circuit comprises diesel oil tank and the first oil transfer pump, and the second fuel delivery oil circuit comprises Aalcohols fuel fuel tank, first flow control valve, second control valve, the second oil transfer pump, the 3rd oil transfer pump and fuel oil blender;
The first oil transfer pump, the second oil transfer pump and the 3rd oil transfer pump are separately positioned in diesel oil tank, Aalcohols fuel fuel tank and fuel oil blender; Oil circuit switching valve has three ports, joins respectively with delivery outlet, the inlet opening of first flow control valve and first inlet opening of high pressure oil pump of the first oil transfer pump; The second oil transfer pump and second control valve join; The output port of the output port of first flow control valve and second control valve is connected respectively to two input ports of fuel oil blender; The 3rd oil transportation delivery side of pump is connected with the second inlet opening of high pressure oil pump; First flow control valve is connected with Aalcohols fuel fuel tank with diesel oil tank with the second return tube by the first return tube respectively with second control valve;
Oil circuit switching valve, first flow control valve and second control valve are all controlled by electronic control unit;
On diesel engine, be provided with the temperature transducer for detection of cooling water temperature, be provided with liquid densitometer in fuel oil blender, temperature transducer and liquid densitometer all join with electronic control unit;
Operating mode 1: in the time that electronic control unit detects cooling water temperature lower than T, judge to be now diesel engine cold start and warm-up period, by oil circuit control switching valve, the first fuel delivery oil circuit is connected: the first oil transfer pump is communicated with the first inlet opening of high pressure oil pump by oil circuit switching valve, and not conducting between oil circuit switching valve and first flow control valve;
Operating mode 2: in the time that electronic control unit detects cooling water temperature higher than T, judge now for diesel engine completes warming-up, electronic control unit connects the second fuel delivery oil circuit by oil circuit control switching valve, the first oil transfer pump is by oil circuit switching valve and the conducting of first flow control valve, fuel oil in diesel oil tank and Aalcohols fuel fuel tank enters through first flow control valve and second control valve the second inlet opening that enters again high pressure oil pump after fuel oil blender mixes respectively, and the first oil transfer pump be cut off being connected of the first inlet opening of high pressure oil pump.
2. the method that simultaneously reduces diesel engine nitrogen oxide and carbon smoke exhaust according to claim 1, it is characterized in that, in described operating mode 2, the fluid density value of electronic control unit based on liquid densitometer feedback, is stabilized between 0.81-0.83 fuel combination relative density by controlling first flow control valve and second control valve.
3. the method that simultaneously reduces diesel engine nitrogen oxide and carbon smoke exhaust according to claim 1, is characterized in that, T is 40-60 degree Celsius.
4. the method that simultaneously reduces diesel engine nitrogen oxide and carbon smoke exhaust according to claim 1, is characterized in that, oil circuit switching valve has manual control mechanism.
5. the method that reduces diesel engine nitrogen oxide and carbon smoke exhaust according to time described in claim 1-4 any one, is characterized in that in Aalcohols fuel fuel tank, fuel comprises at least one in butanols, ethanol or methyl alcohol.
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| CN201210234926.8A CN102733944B (en) | 2012-07-09 | 2012-07-09 | System and method for reducing emissions of nitric oxide and carbon smoke of diesel engine simultaneously |
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| CN201210234926.8A CN102733944B (en) | 2012-07-09 | 2012-07-09 | System and method for reducing emissions of nitric oxide and carbon smoke of diesel engine simultaneously |
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| CN102733944B true CN102733944B (en) | 2014-06-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2538338C1 (en) * | 2013-06-24 | 2015-01-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Пензенская государственная сельскохозяйственная академия" | Mixer of biomineral fuel components |
| CN104948360B (en) * | 2015-05-28 | 2017-07-07 | 同济大学 | A kind of fuel feeding method suitable for low temp area |
| CN105003337B (en) * | 2015-06-03 | 2017-08-29 | 亚能石化股份有限公司 | A kind of control method and system of diesel oil methanol dual fuel engine |
| CN105041487B (en) * | 2015-07-09 | 2018-05-08 | 胡松平 | Automobile multi fuel supply control system |
| CN105003344B (en) * | 2015-07-09 | 2018-05-08 | 胡松平 | Motor vehicle diesel, alcohols dual fuel supply system |
| US10487760B2 (en) * | 2016-04-14 | 2019-11-26 | Ford Global Technologies, Llc | System and methods for reducing particulate matter emissions |
| CN108035813A (en) * | 2017-11-28 | 2018-05-15 | 天津大学 | A kind of integrated injection system for accurately controlling the instantaneous mixing proportion of double fuel |
| CN109630245B (en) * | 2018-12-14 | 2020-12-01 | 武汉理工大学 | Light hydrocarbon/diesel fuel reforming system and reforming method |
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| FR2890694A1 (en) * | 2005-09-14 | 2007-03-16 | Renault Sas | Fuel injection device for e.g. diesel engine of motor vehicle, has electronic control unit adapted to control transfer unit for forming target fuel mixture with characteristics defined based on engine operation conditions |
| JP2008075467A (en) * | 2006-09-19 | 2008-04-03 | Toyota Motor Corp | Fuel controller for internal combustion engine |
| CN101153563B (en) * | 2006-09-26 | 2010-05-12 | 天津农学院 | Oil supply controlling system for diesel engine burning vegetable oil and its oil supply method |
| DE102007020385A1 (en) * | 2007-01-16 | 2008-07-24 | Hans-Dieter Hartl | Vegetable oil or diesel mechanism for operating internal-combustion engine, for locomotive or airplane, has vegetable oil fuel tank oil fuel from which required vegetable oil is supplied to fuel cycle through combustion engine |
| JP2010163975A (en) * | 2009-01-15 | 2010-07-29 | Toyota Motor Corp | Engine system |
| CN102374044A (en) * | 2011-10-28 | 2012-03-14 | 合肥工业大学 | Fuel supply system for diesel and butanol low temperature combustion dual-fuel engine |
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