CN102733944A - 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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- CN102733944A CN102733944A CN2012102349268A CN201210234926A CN102733944A CN 102733944 A CN102733944 A CN 102733944A CN 2012102349268 A CN2012102349268 A CN 2012102349268A CN 201210234926 A CN201210234926 A CN 201210234926A CN 102733944 A CN102733944 A CN 102733944A
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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 reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously.
Background technique
Along with the rising at full speed of global automobile pollution, the pollution that vehicle exhaust causes is serious day by day, impels the researcher to be devoted to the research and development that motor vehicle exhaust emission purifies.Concerning diesel engine, nitrogen oxide (NO
x) and particle (mainly being soot) be its most important two kinds of noxious emissions; And exist a kind of this that long relations (Trade-off) that disappear between two kinds of effulents; Promptly reduce the rising that a kind of measure of effulent often brings another kind of effulent, this makes that reducing by two kinds of effulents simultaneously becomes a technical barrier.One of measure of extensively adopting at present is through reducing the NOx discharging in exhaust gas recirculation (EGR) machine, adopting diesel engine particles catcher (DPF) to carry out the reprocessing of particle again; Another measure is to reduce the discharging of cylinder endoparticle through oil spout control, carries out NO through catalytic reduction (SCR) optionally again
xReduction handle.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 deficient day by day of petrochemical industry resource makes the research and development of novel automobile substitute fuel become one of hot spot technology.Aalcohols fuel, for example methyl alcohol, ethanol and butanols etc., because its living beings source widely, and the characteristics that contain clean fuels such as oxygen, receive the concern of countries in the world.There are some researches show; The tradition fossil fuel; Be gasoline and diesel oil; Can significantly reduce its carbon smoke exhaust through mixing the burning Aalcohols fuel, this is also for reducing harmful emission of diesel engine, realizing that high-efficiency cleaning burns, the use of minimizing diesel engine costliness exhaust gas aftertreatment system provides a direction to greatest extent in the machine.
Summary of the invention
Technological scheme of the present invention is following:
A kind of system that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously comprises 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 the diesel oil tank and first oil transfer pump, and the second fuel delivery oil circuit comprises Aalcohols fuel fuel tank, first flow control valve, second flow control valve, second oil transfer pump, the 3rd oil transfer pump and fuel oil blender;
First oil transfer pump, second oil transfer pump and the 3rd oil transfer pump are separately positioned in diesel oil tank, Aalcohols fuel fuel tank and the fuel oil blender; The oil circuit switching valve has three ports, joins with the delivery outlet of first oil transfer pump, the inlet opening of first flow control valve and first inlet opening of oil pump respectively; Second oil transfer pump and second flow control valve join; The output port of the output port of first flow control valve and second flow control valve is connected respectively to two input ports of fuel oil blender; The 3rd oil transportation delivery side of pump links to each other with second inlet opening of oil pump; The first flow control valve links to each other with the Aalcohols fuel fuel tank with diesel oil tank with second return tube through first return tube respectively with second flow control valve;
Oil circuit switching valve, first flow control valve and second flow control valve all are controlled by electronic control unit;
On diesel engine, be provided with the temperature transducer that is used to detect cooling water temperature, in fuel oil blender, be provided with liquid densitometer, temperature transducer and liquid densitometer all join with electronic control unit.
A kind of method that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously adopts the described system that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously;
Operating mode 1: when electronic control unit detects cooling water temperature and is lower than T; Judge that be diesel engine cold start and warm-up period this moment; Then through the control oil channel switching valve fuel delivery oil circuit of winning is connected: promptly first oil transfer pump is communicated with first inlet opening of oil pump through the oil circuit switching valve, and not conducting between oil circuit switching valve and the first flow control valve;
Operating mode 2: when electronic control unit detects cooling water temperature and is higher than T; Judge and accomplish warming-up for diesel engine this moment; Then electronic control unit connects the second fuel delivery oil circuit through the control oil channel switching valve; Promptly first oil transfer pump is through oil circuit switching valve and the conducting of first flow control valve; Fuel oil in diesel oil tank and the Aalcohols fuel fuel tank gets into second inlet opening that gets into oil pump after fuel oil blender mixes again through first flow control valve and second flow control valve respectively, and first oil transfer pump be cut off being connected of first inlet opening of oil pump.
In described operating mode 2, electronic control unit makes the fuel combination relative density be stabilized between the 0.81-0.83 based on the fluid density value and the operating mode of liquid densitometer feedback through the control first flow control valve and second flow control valve.
Said operating mode is by accelerator pedal position signal and tach signal decision.
Said T is 40-60 degree centigrade.
Said oil circuit switching valve has manual control mechanism.
Fuel comprises at least a in butanols, ethanol or the methyl alcohol in the said Aalcohols fuel fuel tank.
Beneficial effect
A kind of system and method that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously of the present invention; Through increasing by one tunnel 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; Not blending this moment Aalcohols fuel can avoid the big latent heat of vaporization of Aalcohols fuel and the low engine cold starting stage that cetane number caused to catch fire and combustion instability, the high problem of combustion efficiency poor, hydrocarbon (HC) discharging like this; Behind hot machine; Motor switches to diesel oil-alcohols fuel combination according to cooling water temperature and supplies with oil circuit; Exhaust gas recirculation (EGR) system through former diesel engine comes the NOx that significantly reduces in the cylinder to generate; The oxygen effect that contains through Aalcohols fuel significantly reduces the soot generation in the cylinder on the other hand, reaches significantly to reduce NOx and soot source emission, the purpose that the expensive exhaust gas aftertreatment system of minimizing diesel engine uses in the motor simultaneously; Monitor fuel combination density in real time according to liquid densitometer, control the mixing proportion of Aalcohols fuel under the different operating modes, to guarantee the power character and the Economy of diesel engine with this; Therefore basically do not change original diesel engine structure, both can guarantee that former diesel oil supplied with the inheritance of oil circuit, can realize flexibly that multiple Aalcohols fuel (methyl alcohol, ethanol and butanols) mixes burning with mixing of diesel oil yet.
This system and controlling method on the one hand can be on the bases that guarantees former engine power performance and Economy; Reduce simultaneously NOx and carbon smoke exhaust significantly; Reduce the use of expensive after-treatment system, can also guarantee to mix pure motor on the other hand and have good cold-start performance.
Description of drawings
Fig. 1 structural representation of the present invention;
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 that contains 40% butanols volume ratio.
Embodiment
Elaborate in the face of embodiments of the invention down, this instance provided detailed mode of execution and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technological scheme of the present invention.
As shown in Figure 1, a kind of system that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously 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 first oil transfer pump, 14, the second fuel delivery oil circuits comprise Aalcohols fuel fuel tank 8, first flow control valve 17, second flow control valve 18, second oil transfer pump 15, the 3rd oil transfer pump 16 and fuel oil blender 9;
First oil transfer pump 14, 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 the fuel oil blender 9; The oil circuit switching valve has three ports, joins with the delivery outlet of first oil transfer pump 14, the inlet opening of first flow control valve 17 and first inlet opening of oil pump 4 respectively; Second oil transfer pump 15 and second flow control valve 18 join; The output port of the output port of first flow control valve 17 and second flow 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 links to each other with second inlet opening of oil pump 4; First flow control valve 17 links to each other with Aalcohols fuel fuel tank 8 with diesel oil tank 2 with second reflow pipe 20 through first reflow pipe 19 respectively with second flow control valve 18;
Oil circuit switching valve, first flow control valve and second flow control valve all are controlled by electronic control unit;
On diesel engine, be provided with the temperature transducer 5 that is used to detect cooling water temperature, in fuel oil blender, be provided with liquid densitometer 10, temperature transducer and liquid densitometer all join with electronic control unit.
Be filled with butanols in the Aalcohols fuel fuel tank 8.
At diesel engine cold start and warm-up period; Electronic control unit 11 is according to the cooling water temperature of cooling-water temperature sensor 5 feedbacks; Control oil channel switching valve 3 switches to the 1 road diesel oil and supplies with oil circuit, and this moment, the diesel fuel in diesel oil tank 2 was pumped by first oil transfer pump 14, gets in the oil pump 4 through oil circuit switching valve 3; And through sending into common rail pipe 6 after oil pump 4 pressurizations, after the oil sprayer 7 of electronic control unit (ECU) 11 controls sprays into burning chamber of diesel engine.Behind the hot machine; When detecting cooling water temperature, ECU11 raises; When equaling or exceeding 60 ℃; Then control oil channel switching valve 3 switches to the 2 road diesel oil-alcohols fuel combination and supplies with oil circuit; This moment, diesel fuel was still pumped through diesel oil tank 2 by first oil transfer pump 14, and through the fuel oil blender 9 of oil circuit switching valve 3 with first flow control valve 17 entering carrying liqs densitometers 10, Aalcohols fuel (butanols) is then pumped from Aalcohols fuel fuel tank 8 through second flow control valve 18 by second oil transfer pump 15 and gets into fuel oil blenders 9; ECU11 is according to the fuel combination density in the fuel oil blender 9 of liquid densitometer 10 measurements; Control second flow control valve 18 and regulate the Aalcohols fuel flow that gets in the fuel oil blender 9, to guarantee that diesel oil-Aalcohols fuel mixed proportion changes in the 0-60% scope with operating mode, corresponding fuel combination relative density changes between 0.83 to 0.81.For example; If the 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 surpasses 20%; Then regulate second flow control valve 18 and reduce the Aalcohols fuel flow that gets in the fuel mixer 9, corresponding increase simultaneously is through the diesel oil flow of first flow control valve 17, and unnecessary Aalcohols fuel is got back in the Aalcohols fuel fuel tank 8 through second return tube 20 of second flow control valve 18.The diesel oil that in fuel oil blender 9, mixes-alcohols fuel combination is input in the oil pump 4 of former machine through the 3rd oil transfer pump 16; After pressurization, send into common rail pipe 6; After the oil sprayer 7 of electronic control unit (ECU) 11 controls sprays into the compression ignition combustion that burning chamber of diesel engine carries out oxygen-containing blended fuel; (gas recirculation system by former diesel engine is realized to combine the EGR of certain proportion (0-50%) to lead simultaneously; Comprise gaseous effluent 12 and EGR valve 13), can in motor, significantly reduce the nitrogen oxide source emission more than the soot source emission and 90% of diesel engine more than 95% simultaneously, realize the high-efficiency cleaning burning of diesel engine.
As shown in Figures 2 and 3, behind the system and method, nitrogen oxide and carbon smoke exhaust have all obtained tangible reduction in the diesel engine in the employing present embodiment.
Claims (6)
1. a system that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously is characterized in that, comprises 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; High pressure oil pump, common rail pipe, oil sprayer and diesel engine are connected successively;
The first fuel delivery oil circuit comprises the diesel oil tank and first oil transfer pump, and the second fuel delivery oil circuit comprises Aalcohols fuel fuel tank, first flow control valve, second flow control valve, second oil transfer pump, the 3rd oil transfer pump and fuel oil blender;
First oil transfer pump, second oil transfer pump and the 3rd oil transfer pump are separately positioned in diesel oil tank, Aalcohols fuel fuel tank and the fuel oil blender; The oil circuit switching valve has three ports, joins with the delivery outlet of first oil transfer pump, the inlet opening of first flow control valve and first inlet opening of oil pump respectively; Second oil transfer pump and second flow control valve join; The output port of the output port of first flow control valve and second flow control valve is connected respectively to two input ports of fuel oil blender; The 3rd oil transportation delivery side of pump links to each other with second inlet opening of high pressure oil pump; The first flow control valve links to each other with the Aalcohols fuel fuel tank with diesel oil tank with second return tube through first return tube respectively with second flow control valve;
Oil circuit switching valve, first flow control valve and second flow control valve all are controlled by electronic control unit;
On diesel engine, be provided with the temperature transducer that is used to detect cooling water temperature, in fuel oil blender, be provided with liquid densitometer, temperature transducer and liquid densitometer all join with electronic control unit.
2. a method that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously is characterized in that, adopts the described system that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously of claim 1;
Operating mode 1: when electronic control unit detects cooling water temperature and is lower than T; Judge that be diesel engine cold start and warm-up period this moment; Then through the control oil channel switching valve fuel delivery oil circuit of winning is connected: promptly first oil transfer pump is communicated with first inlet opening of oil pump through the oil circuit switching valve, and not conducting between oil circuit switching valve and the first flow control valve;
Operating mode 2: when electronic control unit detects cooling water temperature and is higher than T; Judge and accomplish warming-up for diesel engine this moment; Then electronic control unit connects the second fuel delivery oil circuit through the control oil channel switching valve; Promptly first oil transfer pump is through oil circuit switching valve and the conducting of first flow control valve; Fuel oil in diesel oil tank and the Aalcohols fuel fuel tank gets into second inlet opening that gets into oil pump after fuel oil blender mixes again through first flow control valve and second flow control valve respectively, and first oil transfer pump be cut off being connected of first inlet opening of oil pump.
3. the method that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously according to claim 2; It is characterized in that; In described operating mode 2; Electronic control unit makes the fuel combination relative density be stabilized between the 0.81-0.83 based on the fluid density value of liquid densitometer feedback through the control first flow control valve and second flow control valve.
4. the method that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously according to claim 2 is characterized in that, T is 40-60 degree centigrade.
5. the method that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously according to claim 2 is characterized in that the oil circuit switching valve has manual control mechanism.
6. according to each described method that reduces diesel engine nitrogen oxide and carbon smoke exhaust simultaneously of claim 2-5, it is characterized in that fuel in the Aalcohols fuel fuel tank comprises at least a in butanols, ethanol or the 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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| CN105003344A (en) * | 2015-07-09 | 2015-10-28 | 胡松平 | Automobile diesel and alcohol dual fuel feed system |
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| CN107299864A (en) * | 2016-04-14 | 2017-10-27 | 福特环球技术公司 | System and method for reducing microparticle matter exhaust |
| CN107299864B (en) * | 2016-04-14 | 2022-05-13 | 福特环球技术公司 | System and method 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 |
| CN109630245A (en) * | 2018-12-14 | 2019-04-16 | 武汉理工大学 | A kind of lighter hydrocarbons/Reforming Diesel Fuel system and reforming method |
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