CN100396906C - Fuel fractionation method and fuel fractionation apparatus for internal combustion engine - Google Patents
Fuel fractionation method and fuel fractionation apparatus for internal combustion engine Download PDFInfo
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- CN100396906C CN100396906C CNB200480018792XA CN200480018792A CN100396906C CN 100396906 C CN100396906 C CN 100396906C CN B200480018792X A CNB200480018792X A CN B200480018792XA CN 200480018792 A CN200480018792 A CN 200480018792A CN 100396906 C CN100396906 C CN 100396906C
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- 239000000446 fuel Substances 0.000 title claims abstract description 199
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- 238000000034 method Methods 0.000 title abstract description 13
- 239000012071 phase Substances 0.000 claims abstract description 50
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- 230000001737 promoting effect Effects 0.000 abstract description 4
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- 239000003638 chemical reducing agent Substances 0.000 description 8
- 239000002828 fuel tank Substances 0.000 description 8
- 239000005864 Sulphur Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
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- 230000004044 response Effects 0.000 description 3
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 3
- FCEHBMOGCRZNNI-UHFFFAOYSA-N 1-benzothiophene Chemical compound C1=CC=C2SC=CC2=C1 FCEHBMOGCRZNNI-UHFFFAOYSA-N 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
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- 230000008569 process Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
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- 230000008020 evaporation Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
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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
Abstract
A fuel fractionation method which can suitably control a state of a fuel at a time of fractionating the fuel in an internal combustion engine, which comprises the steps of applying an operation for promoting a fractionation of a fuel of an engine (1) to a fractionation passage (21) while making the fuel flow to the fractionation passage (21), thereby fractionating the fuel into a gas phase fuel and a liquid phase fuel within the fractionation passage (21), conducting the fractionated gas phase fuel and the fractionated liquid phase fuel to a branch point (21c) of the fractionation passage (21), and separating the gas phase fuel and the liquid phase fuel to a gas phase passage (23) and a liquid phase passage (22), respectively due to gravity.
Description
Technical field
The present invention relates to the fuel fractionation method and the fuel fractionation apparatus of internal-combustion engine.
Background technique
Known Exhaust gas purifying device, it is given by exhaust heat and is accumulated in internal-combustion engine vent-pipe fuel heating on every side so that fuel fractionation is become the light component of gas phase and the heavy ends of liquid phase, and the light component that fractionates out is supplied to NO as reducing agent
xOcclusion-reduction catalyst is so that reduce the NO that catalyzer is discharged
x(with reference to JP3093905B).In addition, publication JP2850547B, JP11-210447A and JP2001-193525 are as document related to the present invention.
Summary of the invention
In above-mentioned conventional apparatus,, promptly be difficult to fuel temperature is controlled in the temperature range that is fit to fractionation because many fuel accumulations around outlet pipe, so fuel temperature is very poor to the response of exhaust gas temperature change, and have such situation.In addition, when cut point was improper, light component was not vaporized or the heavy ends vaporization, and light component and heavy ends mix thus.
Thereby target of the present invention provides the fuel fractionation method and the fuel fractionation apparatus of internal-combustion engine, and it can be easily and promptly fuel is controlled to the state of suitable fractionation so that fuel is separated into light component and heavy ends.
In order to realize above-mentioned target, a kind of fuel fractionation method of internal-combustion engine is provided, comprise the following steps: when making fuel flow to fractionation passage to use the operation that promotes the motor fuel fractionation, thereby in fractionation passage, fuel fractionation become gas phase fuel and liquid phase fuel to fractionation passage; Gas phase fuel that fractionates out and the liquid phase fuel that fractionates out are directed to the point of branching of fractionation passage; With since gravity make gas phase fuel and liquid phase fuel be separated to top set's passage and inferior division passage respectively.
According to fuel fractionation method of the present invention, owing to when making fuel flow to the distribution passage, use the operation that promotes fractionation to fractionation passage, so compare with the situation of many fuel fractionation simultaneously in will being accumulated in certain position, fuel becomes sensitive to the response of the operation of promotion fractionation, and can easy and promptly fuel be controlled to the state of suitable fractionation.
In addition, owing to gas phase fuel is separated to respectively the different branched bottoms from point of branching with liquid phase fuel, so can realize separating of the gas phase fuel that fractionates out and liquid phase fuel by simple structure by the difference of utilizing proportion between gas phase fuel and the liquid phase fuel.In this case, realize promoting the operation of fractionation usually by heating, yet, other operation different also can be adopted, as long as this operation can promote the vaporization of fuel with heating operation.
In order to realize above-mentioned target, a kind of fuel fractionation apparatus of internal-combustion engine also is provided, comprise: fractionation passage, it links to each other with the fuel supply system of internal-combustion engine and partly arrives terminal point of branching by fractionation, and the fractionation promoting effect of fuel is applied to the fractionation part; From the liquid phase branch passage of point of branching to downside branch; With from point of branching to than the gas phase branch passage of liquid phase branch passage by last upside branch.
According to fuel fractionation apparatus of the present invention,, can easy and promptly fuel be controlled to the state that is fit to fractionation in the mode identical with above-mentioned fractional method.In addition, can realize separating of the gas phase fuel that fractionates out and liquid phase fuel by simple structure.In this case, fuel fractionation promotes operation can comprise any operation, if this operation can with the above-mentioned vaporization that promotes fuel according to the identical mode of the operation that promotes fractionation in the fuel fractionation method of the present invention.
In fuel fractionation apparatus of the present invention, the inlet of liquid phase branch passage can be provided with gas phase fuel and flow into prohibition unit, is used for forbidding owing to the existence of liquid phase fuel the downstream side of gas phase fuel inflow liquid phase branch passage.In this case, even in gas phase fuel when point of branching flows into the inlet of liquid phase branch passage, also can flow into prohibition unit and forbid that gas phase fuel flows in the downstream side of liquid phase branch passage by gas phase fuel, thereby, can reclaim light component and heavy ends from each branched bottom safely with merotomizing.In addition, can flow in gas phase fuel aperture is set in the prohibition unit.Owing to make the liquid phase branch passage throttling by the aperture in the entrance part, so gas phase fuel is difficult to flow in the downstream side of liquid phase branch passage, compare with the structure that does not have aperture, can more safely separate gas phase fuel and liquid phase fuel.
In fuel fractionation apparatus of the present invention, fractionation part can run through a zone, and the heating operation that is caused by the used heat of internal-combustion engine promotes operational applications to this zone as fractionation.As mentioned above, by utilizing the used heat of internal-combustion engine, needn't promote the required energy of fuel fractionation from the outside supply.
Fuel fractionation apparatus of the present invention can be utilized the used heat of the exhaust gas heat of internal-combustion engine as internal-combustion engine.In this case, can be by promoting fractionation through fractionation fuel partly with the exhaust gas heat heating.
Fuel fractionation apparatus of the present invention can comprise as producing the pressure regulating equipment that fractionation promotes apparatus operating, is used to regulate the pressure in the fractionation passage.Can pass through to reduce the boiling point of the pressure reduction fuel in the fractionation passage, thereby, can promote the vaporization of fuel so that promote fractionation by adjusting pressure.
Fuel fractionation apparatus of the present invention can comprise pressure control equipment, is used for the operation based on the temperature pilot pressure regulating equipment of the fuel that flows through fractionation passage.When the temperature of the fuel that flows through fractionation passage was lower than under atmospheric pressure boiling point of fuel, fuel was difficult to vaporization, in this case, and can be by reducing the pressure in the fractionation passage so that reduce the vaporization that the fuel boiling point promotes fuel.Even the temperature in that fuel is difficult to vaporize also can remain in the constant expectation state by the Distillation properties of the pressure in the adjusting fractionation passage with fractionation passage.
Fuel fractionation apparatus can comprise the temperature that is used for detection branches point temperature testing equipment, can regulate the temperature control equipment and the Temperature-controlled appliance of the temperature of point of branching, Temperature-controlled appliance based on the operation of the detected temperature of temperature testing equipment control temperature control equipment so that the temperature of point of branching is remained on preset target temperature.In this case, the temperature at point of branching place can be remained to target temperature, so that the stalling characteristic between light component and the heavy ends is remained in the constant expectation state.In this case, according to various conditions as the component of light component to be vaporized target setting temperature approx.
In fuel fractionation apparatus of the present invention, temperature control equipment can change the flow fuel that is directed into the fractionation part so that regulate the temperature of point of branching.Owing to determining the temperature of the fuel of arrival point of branching, so can be directed into the temperature that fractionation flow fuel is partly regulated the point of branching place by change based on the self-purging heat of supply in the fractionation part with through the flow fuel of fractionation part.Thereby, can be based on simple structure, as flow control valve, with the temperature regulation at point of branching place to required scope.
In fuel fractionation apparatus of the present invention, Temperature-controlled appliance can the operating temperature regulating equipment so that when but the detected temperature of temperature testing equipment departs from allowed band with respect to target temperature, the flow fuel that is directed into the fractionation part is restricted to minimum value.When the temperature at point of branching place was hanged down, the fuel of light component can not vaporized, or only vaporization on a small quantity, even be considered to this moment when fuel is introduced the fractionation part, light component also can arrive point of branching with liquid form with heavy ends.On the other hand, when the temperature at point of branching place is high, even heavy ends also have the danger that is vaporized.On the contrary, but but the allowed band by setting the point of branching temperature and when the temperature departure allowed band flow is suppressed to minimum value can forbid that light component and heavy ends mix.In this case, minimum value can be 0, maybe can be the selected value greater than 0.In other words, flow is suppressed to minimum aspect comprises following two kinds of situations, promptly make fuel not be introduced in the fractionation part and supply fuel to fractionation and partly and with flow restriction arrive adjustable minimum value by the supply that stops fuel.
Fuel fractionation apparatus can comprise the container and be used to detect the situation decline low target temperature that the memory space detection facility of memory space of container and Temperature-controlled appliance can increase in the detected memory space of memory space detection facility that distillates fuel of distillating fuel that is used to store the fuel of deriving from gas phase branch passage.When the memory space of stored gas phase fuel is too big, can only will has more lower boiling slash fuel and be directed to gas phase branch passage by reducing target temperature.On the other hand, when memory space hour, can increase the output of vaporized component by increasing target temperature, thereby increase sharply memory space.
In fuel fractionation apparatus of the present invention, fractionation partly can be arranged in the exhaust passage of internal-combustion engine and point of branching can be arranged on the outside of exhaust passage.In this case, because fractionation partly is arranged in the exhaust passage, so can finish heat exchange between exhaust and the fuel effectively.On the other hand, because point of branching is arranged on the outside of exhaust passage, so can make the delivery temperature fluctuation very little and can more easily control the temperature at point of branching place to the influence of point of branching temperature fluctuation.
In fuel fractionation apparatus of the present invention, exhaust gas purification apparatus can be arranged in the exhaust passage of internal-combustion engine, and the fractionation part can be set like this so that it finishes the heat exchange between fractionation part and the exhaust passage in the downstream side of exhaust gas purification apparatus.In this case,, the thermal absorption that the temperature fluctuation of exhaust is caused by exhaust gas purification apparatus is absorbed, so can more easily control the temperature of the point of branching in fractionation part and its downstream side because producing with heat.When the temperature with exhaust gas purification apparatus controls to predetermined temperature range, can further easily control the temperature at point of branching place and be used to control the device of the temperature of exhaust gas purification apparatus by utilization, can control the temperature at point of branching place.
In fuel fractionation apparatus of the present invention, fractionation part can be set in case its finish the fractionation part and surround the engine main body of combustion chambers of internal combustion engines or the cooling water of engine main body between heat exchange.In the running of internal-combustion engine, the engine main body that surrounds the firing chamber is by water quench, and is maintained at approximate fixing temperature.In addition, since the thermal capacity of cooling water greater than gas, so its temperature can not change rapidly, thereby, by arranging the fractionation part so that itself and engine main body or its cooling water heat-shift can stably supply thermal energy to the fractionation part, thereby, fractionated fuel stably.
In fuel fractionation apparatus of the present invention, do not limit the desired use of isolated gas phase fuel (light component) and liquid phase fuel (heavy ends), yet, as the preferred aspect of desired use, can list a kind of structure, be about to light component and be added to NO as reducing agent
xOcclusion-reduction catalyst.In this case, the reaction of the reducing agent in the catalyzer improves NO
xReduction efficiency improve.In addition, because light reducing agent has the evaporation properties of improvement, so by using light component to suppress because reducing agent is attached to catalyzer the catalyzer front-end face is closed.
As discussed above, according to the present invention, owing to when being directed to fuel in the fractionation passage, use the operation that promotes fractionation to fractionation passage, so compare with the situation that will be stored in a large amount of fuel fractionation simultaneously in the standing part, fuel becomes sensitive to the response of the operation of promotion fractionation, and can easy and promptly fuel be controlled to the state of suitable fractionation.
Description of drawings
Fig. 1 is the figure of expression according to first embodiment of fractionating device of the present invention;
Fig. 2 is the figure with a part of amplifying the fractionating device in the mode presentation graphs 1;
Fig. 3 is a flow chart, the ECU of the fractionating device in the presentation graphs 1 carries out opens-and the program of closing control routine;
Fig. 4 A and 4B are the figure that is illustrated in the switch motion of the target temperature that uses in the opening of Fig. 3-closing control routine and the valve in the opening of Fig. 3-closing control routine;
Fig. 5 is the figure of expression according to second embodiment of fractionating device of the present invention;
Fig. 6 is the figure of expression according to the 3rd embodiment of fractionating device of the present invention;
Fig. 7 is the figure with a part of amplifying the fractionating device in the mode presentation graphs 6;
Fig. 8 is the figure of another example in the expression a third embodiment in accordance with the invention;
Fig. 9 is a flow chart, the pressure control routine that the ECU in the presentation graphs 8 carries out;
Figure 10 is illustrated in the figure that an example of aperture is set in the inlet of liquid phase fuel branch passage; With
Figure 11 is improvement embodiment's the figure of the liquid channel of the fractionating device in the presentation graphs 1.
Embodiment
(first embodiment)
Fig. 1 represents an embodiment, wherein will fuel fractionation apparatus according to the present invention be applied to the diesel engine 1 as internal-combustion engine.Intake duct 2 links to each other with motor 1 with air outlet flue 3, in intake duct 2, be provided with the gas compressor 4a of pressurized machine 4 and be used to regulate the closure 5 of air inflow, gas compressor 4a utilizes exhaust energy to increase suction pressure, in 3 one sides of exhaust passage, be provided with the turbine 4b that is arranged in the pressurized machine 4 in the manifold 3a downstream side respectively and be arranged in Exhaust gas purifying device 6 in the downstream side of turbine 4b.It is known structure that exhaust gas purification adorns 6, is wherein for example carrying occlusion-reduced form NO by the filter substrate that is used to collect particulate
xCatalyst material.In this case, do not limit NO
xThe occlusion aspect, as long as can keep NO
xGet final product.
The running state of motor 1 is by control unit of engine (ECU) 11 controls, ECU11 is configured to make up microprocessor and peripheral unit and the computer that obtains, peripheral unit for example is ROM, serves as RAM of main memory unit or the like that ECU11 controls the running state of motor 1 from various signal of sensor fuel metering emitted doses or the like by reference.
As also illustrating among Fig. 2, fractionation passage 21 arrives point of branching 21c via fractionation part 21a and horizontal part 21b, and fractionation part 21b process obliquely in the exhaust passage 3 of Exhaust gas purifying device 6 upstream sides tilts with respect to substantially horizontal simultaneously.Horizontal part 21b and point of branching 21c are arranged on the outside of exhaust passage 3, and fractionation passage 21 is extended towards downside generally, supply with from the return flow line 10 fuel (liquid phase fuel) f1 since gravity flow to point of branching 21c.
The memory space detecting sensor 27 that fractionating device 20 shown in Fig. 1 also is provided with the valve 25 that is equivalent to temperature control equipment, the temperature transducer 26 that is equivalent to temperature testing equipment and is equivalent to the memory space detection facility.Valve 25 is a solenoid valve, it can open and close the joint between return flow line 10 and the fractionation passage 21, the motion of valve 25 is by the ECU11 control that is equivalent to Temperature-controlled appliance, and temperature transducer 26 is arranged among the point of branching 21c, and the signal consistent with detected temperature outputed to ECU11.Memory space detecting sensor 27 detects the memory space and the output signal consistent with detected memory space of the container 24 that distillates fuel.
To the operation of fractionating device 20 with said structure be described.Fig. 3 is a flow chart, the process of the opening of the switch motion that is used for control valve 25 that expression ECU11 carries out-closing control program.In the running of motor 1, program repeats with predetermined period (for example, 0.5 second).
ECU11 at first judges based on memory space detecting sensor 27 detected memory spaces whether the container 24 that distillates fuel fills (step S1).When ECU11 determined that it is filled, ECU11 made valve 25 close (step S11) and terminator fully.When ECU11 determined that it is not filled, ECU11 was according to the target temperature (step S2) of memory space setting point of branching 21c, and at this moment, as shown in Fig. 4 A, ECU11 sets so that memory space is big more, and it is low more that target temperature becomes.Can come target setting temperature suitably according to the component of the fuel that obtains according to fractionation, yet also target temperature can be set in the scope, for example about 220 ℃.In this case, in Fig. 4 A, in the exemplary situation, reduce target temperature with respect to the increase of memory space with constant variance ratio, yet variance ratio can change also with respect to memory space.In step S1, judge whether the container 24 that distillates fuel is filled, yet whether the container 24 of also can determining to distillate fuel is equal to or greater than optional prearranging quatity, the memory space of this prearranging quatity when being full of.
In the step S3 and S4 of Fig. 3, but but ECU11 judges that whether temperature transducer 26 detected temperature are lower than the lower limit of allowed band with respect to target temperature and whether it is higher than the CLV ceiling limit value of allowed band.When ECU 11 determined that it is lower than lower limit or is higher than CLV ceiling limit value, ECU11 made valve 25 close (step S11) fully, and terminator.When ECU11 determined that but it is in the allowed band, ECU11 forwarded step S5 to.When the program of ECU11 execution in step S3 and S4,, then shown in straight line L1 and L3 among Fig. 4 B, valve 25 cuts out if detected temperature is not present in the scope between lower limit Tmin and the CLV ceiling limit value Tmax.In this case, but can set the lower limit and the CLV ceiling limit value of allowed band suitably, yet also a temperature can be set at lower limit, under this temperature, the output of the light component that obtains is approximately 0 about target temperature.
In the step S5 of Fig. 3, ECU11 judges whether valve 25 closes fully and when ECU11 determined that it is closed fully, the motion of ECU 11 control valves 25 made it reach predetermined aperture (step S6) so that open valve 25.In this case, can reach the aperture of target temperature, set aperture at this moment by the temperature of determining to make rapidly point of branching 21c based on running state of some conditions such as target temperature, temperature transducer 26 detected temperature, internal-combustion engine or the like.When ECU11 determined that valve 25 does not cut out fully in step S5, ECU11 skips steps S6 also forwarded step S7 to.
After step S7, ECU11 based on the aperture of temperature transducer 26 detected heat-operated valves 25 so that the temperature at point of branching 21c place reaches target temperature, so that regulate the flow fuel that flows in the fractionation passage 21.Can be according to the aperture of various controlling method control valves 25, however also can be with as the aperture of step S7 to the mode control valve 25 as shown in the S10.
In step S7, ECU11 judges whether detected temperature equals target temperature, and when ECU11 determines that they equate, the ECU11 terminator.When ECU11 determined that they are unequal, ECU11 determined whether detected temperature is higher than target temperature (step S8).When ECU11 determined that it is higher than target temperature, ECU11 was only measuring the aperture (step S9) that increases valve 25 accordingly with the difference of detected temperature and target temperature, and terminator.When ECU11 determined that detected temperature is not higher than target temperature, ECU11 was to reduce the aperture (step S10) of valve 25 and terminator with the corresponding amount of the difference of detected temperature and target temperature.According to the program of step S7 to S10, shown in the straight line L2 among Fig. 4 B, control valve 25 is so that aperture and detected temperature are proportional, thereby detected temperature converges at target temperature Ts.In this case, can adopt differential control and integral control so that detected temperature converges to target temperature Ts rapidly or accurately, or can be, thereby before the temperature that changes point of branching 21c, change the flow of fractionation passage 21 based on the variation of running state of various conditions such as motor 1 or the like prediction delivery temperature.
In the present embodiment, the fuel that returns via return flow line 10 devices of self-injection in the future is incorporated into fractionation passage 21.Because the temperature of returning fuel from sparger is increased to about 150 ℃, its temperature is higher than the temperature of the fuel in the fuel tank 7, so temperature can be rapidly increased to the cut point among the fractionation part 21a.
In addition, in the present embodiment, target temperature is set at about 220 ℃.Because having the boiling point of the benzothiophene of minimum boiling point in the sulphur content (being equal to or less than 50ppm) in staying low sulfur heavy oil is 220 ℃, so be equal to or less than the temperature fractionation of this temperature, the fuel that obtains via gas phase channel 23 does not comprise sulphur content or comprises sulphur content hardly.Thereby, in the present embodiment, can mainly obtain not have the fuel of sulphur content.In this case, the fuel that does not comprise sulphur content has various usabilities, for example, when the gas-oil that will not comprise sulphur content is added to exhaust passage 3 as reducing agent, can prevent Exhaust gas purifying device 6 sulfur poisonings.
(second embodiment)
Figure 5 illustrates according to a second embodiment of the present invention.In this case, in the present embodiment, same reference character represent with first embodiment in identical parts, and it is not elaborated.In the present embodiment, Exhaust gas purifying device 6 is provided with closerly from turbine 4b, and fractionation part 21a passes exhaust passage 3 in the downstream side of Exhaust gas purifying device 6.In addition, adding sparger 31 is arranged among the manifold 3a.In the present embodiment, NO
xOcclusion-reduction catalyst is controlled and be operated in 250 to 400 ℃ so that work effectively.Thereby the temperature with point of branching 21c controls to 220 ℃ of cut points so that obtain not comprise the fractionated fuel of sulphur easily.
(the 3rd embodiment)
Figure 6 illustrates a third embodiment in accordance with the invention.In addition, Fig. 7 A and 7B represent the figure by the part acquisition of the fractionating device in the enlarged view 6 20, in this case, the plan view of the cylinder head 1a of internal-combustion engine 1 in Fig. 7 A presentation graphs 6, Fig. 7 B are illustrated in from manifold 3a side and see figure under the situation of cross section of the line VII-VII of cylinder head 1a along Fig. 7 A.In this case, in the present embodiment, same reference character represent with first embodiment in identical parts, and it is not elaborated.As conspicuous from Fig. 6,7A and 7B, present embodiment and other embodiment's difference is these points, be that fractionation passage 21 is arranged in and surrounds in the engine main body corresponding cylinder lid 1a of motor 1 firing chamber and drawdown pump 32 is arranged on gas phase channel 23 as the pressure regulating equipment that is used for regulating the interior pressure of fractionation passage 21.Cylinder head 1a even when motor 1 operation, also be cooled, its temperature remains on the temperature that is equal to or less than predetermined temperature, and this predetermined temperature is lower than cut point.Thereby, reduce pressure in the fractionation passage 21 by drawdown pump 32, thereby reduce the boiling point of fuel and promote the vaporization of fuel.
In the present embodiment, because fractionation passage 21 is arranged among the cylinder head 1a with equilibrium temperature, thus heat stably can be supplied to fractionation passage 21, thereby, can make the stable in properties of the gas phase fuel that fractionates out.In this case, by fractionation passage 21 is arranged in the exhaust side, relief opening has higher temperature in cylinder head 1a, thereby can further promote the fractionation of fuel.In addition, owing to can only fractionation passage 21 be arranged in the cylinder head 1a, increase so can suppress the number of components of fractionating device 20, and can reduce cost based on extra work.
In the present embodiment, arrange that the position of fractionation passage 21 is not limited to the engine main body of motor 1, for example, fractionation passage 21 can be set so that can be between the cooling water of motor 1 and fractionation passage 21 heat-shift.In addition, as shown in Figure 8, fractionation passage 21 can be set so that fractionation part 21a runs through exhaust passage 3.
When delivery temperature was low, as just in time after ato unit 1, the temperature that flows through the fuel of fractionation passage 21 was not elevated to cut point, so that fuel is difficult to vaporization.Among the embodiment in Fig. 8, reduce pressure fractionation passage 21 in, reduce the vaporization of the boiling point and the promotion fuel of fuel thus by in above-mentioned situation, making 32 work of the drawdown pump that is arranged in the gas phase channel 23.The work of drawdown pump 32 is controlled by ECU11.Fig. 9 is a flow chart, and expression ECU11 carries out the pressure control routine that being used in Fig. 8 control the work of drawdown pump 32.In the running of motor 1, the control routine among Fig. 9 repeats with predetermined period.ECU11 serves as pressure control equipment by the control routine in the execution graph 9.
In the control routine in Fig. 9, ECU11 judges in step S21 at first whether the temperature of the fuel that flows is lower than target temperature in fractionation passage 21.Can as temperature transducer 26 or exhaust gas temperature sensor 33 or the like detected temperature, estimate the temperature of fuel based on the temperature relevant with the fractionation of fuel.The exhaust gas temperature sensor 33 outputs signal consistent with the temperature of exhaust.When ECU11 determined that the temperature of fuel is not hanged down, ECU11 finished current control routine.
On the other hand, when ECU11 determined that the temperature of fuel is hanged down, ECU11 forwarded step S22 to, and operation drawdown pump 32 is so that the pressure in the adjusting fractionation passage 21.Because according to the boiling point that reduces to reduce fuel of pressure, so the work of ECU11 control drawdown pump 32 is so that the lower temperature of based on fuel reduces the pressure in the fractionation passage 21.Afterwards, ECU11 stops current control routine.
By regulating the pressure in the fractionation passage 21, even when the delivery temperature of motor 1 is hanged down, also can stably make fuel gasification.In addition, by regulating pressure in the fractionation passage 21 so that the boiling point of fuel metering can be set the condition that only makes the light component carburretion, thereby, can make the stable in properties of gas phase fuel.In this case, in the embodiment of Fig. 8, ECU11 can with pressure control routine among Fig. 9 concurrently the opening of valve 25 in the execution graph 3 close-close control routine, thereby regulate the pressure in the fractionation passage 21 and the temperature at point of branching 21c place.
The present invention is not limited to the foregoing description, can realize the present invention aspect various in technical scope of the present invention.For example, be used to promote the energy of the internal-combustion engine of fuel fractionation to be not limited to the heat energy of internal-combustion engine waste such as exhaust gas heat or the like, can utilize any energy to promote fractionation based on the internal combustion engine operation generation.
The heat exchange between the correct position of realization part 21 and exhaust passage 3 fractionation part 21a can be set so that for example, can be provided with fractionation part 21a so that it runs through the inboard of manifold 3a.In this case, because fractionation part 21a is arranged on the position with higher exhaust gas temperature, so the temperature of the fuel that can increase sharply.
As long as can seal the downstream side of the gas phase stagnation 22a of portion, can form gas phase stagnation 22a of portion and channel part 22b with suitable shape by liquid phase fuel.As shown in Figure 10, structure is such so that by increase the internal diameter that aperture 22c reduces liquid channel 22 in the middle of the gas phase stagnation 22a of portion.In this case, gas phase fuel is difficult to flow into the downstream side and can forbid safely that gas phase fuel flows in the downstream side of liquid channel 22 from aperture 22c.As shown in Figure 11, can form gas phase stagnation 22a of portion and channel part 22b by the curved shape that liquid channel 22 is formed S shape.
Can be according to the light component target setting temperature suitably of vaporization.For example, target temperature is not limited to the scope about 220 ℃, can according to the memory space of the container 24 that distillates fuel target temperature be set in the scope that is equal to or less than 220 ℃, maybe target temperature can be fixed near the temperature 220 ℃ or 220 ℃.
Claims (13)
1. the fuel fractionation apparatus of an internal-combustion engine comprises:
Fractionation passage, it links to each other with the fuel supply system of internal-combustion engine and partly arrives terminal point of branching by fractionation, and the fractionation of fuel promotes operation to be applied to described fractionation part;
From the liquid phase branch passage of described point of branching to downside branch; With
From described point of branching to than the gas phase branch passage of liquid phase branch passage by last upside branch,
Wherein, the inlet of described liquid phase branch passage is provided with gas phase fuel and flows into prohibition unit, is used for forbidding gas phase fuel and flowing into the downstream side of described liquid phase branch passage owing to the existence of liquid phase fuel.
2. fuel fractionation apparatus as claimed in claim 1 is characterized in that in described gas phase fuel inflow prohibition unit aperture being set.
3. fuel fractionation apparatus as claimed in claim 1 or 2 is characterized in that described fractionation partly runs through a zone, and the heating operation that is caused by the used heat of internal-combustion engine promotes operational applications to this zone as fractionation.
4. fuel fractionation apparatus as claimed in claim 3 is characterized in that utilizing the used heat of the exhaust gas heat of internal-combustion engine as internal-combustion engine.
5. fuel fractionation apparatus as claimed in claim 1 or 2 comprises as producing the pressure regulating equipment that fractionation promotes apparatus operating, is used to regulate the pressure in the described fractionation passage.
6. fuel fractionation apparatus as claimed in claim 5 comprises pressure control equipment, is used for controlling based on the temperature of the fuel that flows through described fractionation passage the operation of described pressure regulating equipment.
7. fuel fractionation apparatus as claimed in claim 3 comprises:
Be used to detect the temperature testing equipment of the temperature of described point of branching;
Can regulate the temperature control equipment of the temperature of described point of branching; With
Temperature-controlled appliance is used for based on the operation of being controlled described temperature control equipment by the detected temperature of described temperature testing equipment so that the temperature of described point of branching is remained on preset target temperature.
8. fuel fractionation apparatus as claimed in claim 7 is characterized in that described temperature control equipment change is directed into the flow fuel of described fractionation part so that regulate the temperature of described point of branching.
9. fuel fractionation apparatus as claimed in claim 8, it is characterized in that described Temperature-controlled appliance operates described temperature control equipment, so that when the detected temperature of described temperature testing equipment departs from allowed band with respect to target temperature, the flow fuel that is directed into described fractionation part is restricted to minimum value.
10. fuel fractionation apparatus as claimed in claim 8 comprises:
Be used to store the container that distillates fuel from the fuel of described gas phase branch passage guiding; With
Be used to detect the memory space detection facility of the memory space of the described container that distillates fuel,
The situation decline low target temperature that wherein said Temperature-controlled appliance increases in the detected memory space of described memory space detection facility.
11. fuel fractionation apparatus as claimed in claim 3 is characterized in that the outside that partly is arranged on described fractionation in the exhaust passage of internal-combustion engine and described point of branching is arranged on the exhaust passage.
12. fuel fractionation apparatus as claimed in claim 3, it is characterized in that exhaust gas purification apparatus is arranged in the exhaust passage of internal-combustion engine, and described fractionation part is set so that the heat exchange between described fractionation part and the exhaust passage is finished in its downstream side at exhaust gas purification apparatus.
13. fuel fractionation apparatus as claimed in claim 5 is characterized in that being provided with described fractionation part so that it is finished the fractionation part and surrounds between the body of the internal-combustion engine of combustion chambers of internal combustion engines or the heat exchange between the cooling water of fractionation part and body of the internal-combustion engine.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP189799/2003 | 2003-07-01 | ||
| JP2003189799 | 2003-07-01 | ||
| JP324748/2003 | 2003-09-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1816691A CN1816691A (en) | 2006-08-09 |
| CN100396906C true CN100396906C (en) | 2008-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200480018792XA Expired - Fee Related CN100396906C (en) | 2003-07-01 | 2004-06-14 | Fuel fractionation method and fuel fractionation apparatus for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100396906C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4606319A (en) * | 1984-08-20 | 1986-08-19 | Silva Robert E | System and method of vaporizing liquid fuel for delivery to an internal combustion engine |
| JPS6368714A (en) * | 1986-09-10 | 1988-03-28 | Mazda Motor Corp | Exhaust emission control device for engine |
| EP0441401A1 (en) * | 1990-02-09 | 1991-08-14 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification system for an internal combustion engine |
| US5327875A (en) * | 1993-02-19 | 1994-07-12 | Hall S Franklin | Vapor enhanced carburetion system |
| GB2295561A (en) * | 1994-11-29 | 1996-06-05 | Lucas Ind Plc | Device for delivering gaseous hydrocarbon to an engine exhaust |
-
2004
- 2004-06-14 CN CNB200480018792XA patent/CN100396906C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4606319A (en) * | 1984-08-20 | 1986-08-19 | Silva Robert E | System and method of vaporizing liquid fuel for delivery to an internal combustion engine |
| JPS6368714A (en) * | 1986-09-10 | 1988-03-28 | Mazda Motor Corp | Exhaust emission control device for engine |
| EP0441401A1 (en) * | 1990-02-09 | 1991-08-14 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification system for an internal combustion engine |
| US5327875A (en) * | 1993-02-19 | 1994-07-12 | Hall S Franklin | Vapor enhanced carburetion system |
| GB2295561A (en) * | 1994-11-29 | 1996-06-05 | Lucas Ind Plc | Device for delivering gaseous hydrocarbon to an engine exhaust |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1816691A (en) | 2006-08-09 |
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