CN101109343A - Fuel supply system for DME engine - Google Patents

Fuel supply system for DME engine Download PDF

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Publication number
CN101109343A
CN101109343A CNA2007101370379A CN200710137037A CN101109343A CN 101109343 A CN101109343 A CN 101109343A CN A2007101370379 A CNA2007101370379 A CN A2007101370379A CN 200710137037 A CN200710137037 A CN 200710137037A CN 101109343 A CN101109343 A CN 101109343A
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China
Prior art keywords
fuel
dme
solenoid valve
pressure
service duct
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CNA2007101370379A
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Chinese (zh)
Inventor
诸井隆宏
铃木茂
太田雅树
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Toyota Industries Corp
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Toyoda Automatic Loom Works Ltd
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Publication of CN101109343A publication Critical patent/CN101109343A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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Abstract

A feed pump of a fuel supply system for a DME engine rotates in a normal direction to supply DME fuel in a fuel tank to a high-pressure supply pump through a low-pressure fuel supply passage. The high-pressure supply pump pressurizes the DME fuel and discharges the DME fuel therefrom. The discharged DME fuel is distributed by a high-pressure fuel supply passage and injected by a fuel injector. A first fuel recovery passage connects the high-pressure fuel supply passage to the low-pressure fuel supply passage. When the engine is operated, a first solenoid valve closes the first fuel recovery passage. When the engine is stopped, the first solenoid valve opens the first fuel recovery passage and the feed pump rotates in a reverse direction, thereby the DME fuel in the low-pressure fuel supply passage and in the high-pressure fuel supply passage is recovered into the fuel tank.

Description

The fuel system of DME motor
Technical field
The present invention relates to the fuel system of DME motor, its use DME (dimethyl ether) as the fuel of motor and when the engine shutdown recovery fuel.
Background technique
DME is the clean energy resource that environment is not had a strong impact on, and it has attracted attention as fuel of future generation in recent years.DME has high cetane number and is oxygenated fuel especially, and the black smoke discharging is very low when the DME fuel combustion thus.In addition, by exhaust gas recirculation (EGR), DME reduces NOx (nitrogen oxide) and particulate (PM) discharging.Therefore, expectation DME is by the alternative fuel of reality as light oil in the diesel engine.
DME has low boiling (negative 25 degrees centigrade), and vaporization easily.When engine shutdown, be retained in high pressure DME in the fuel feed passage of DME fuel system by heat vaporization from motor and releasing system thereof.Be difficult to prevent that the vaporization DME under the high pressure conditions from leaking.Behind engine shutdown, vaporization DME is from the nozzle leakage of oil sprayer and be retained in the firing chamber.When motor was reset, abnormal combustion and motor can take place may be damaged.
Japanese Patent Application Publication No.2003-56409 discloses a kind of cleaning system that is provided with to prevent the DME fuel system of this abnormal combustion.The DME fuel that is retained in when engine shutdown in the fuel feed passage is recovered to the fuel purifying case by PCV Purge Control Valve from being total to rail.DME is compressed in the compressor that liquefies again and liquefaction more then, and turns back to fuel tank.
In above-mentioned DME fuel cut engine system, need large space the fuel purifying case to be installed and the compressor that liquefies again, and such DME fuel cut engine system may not be arranged on the pickup truck.Especially, the diaphragm type compressor as the compressor that liquefies again is very big usually.In addition, because be used for improving lubricated material resin material is had corrosivity, resin material can not be used for the parts of compressor.This makes and is difficult to reduce weight.In addition, in order to cool off the DME fuel that liquefies again and in the compressor that liquefies again, pressurize reliably, need heat exchanger.Therefore system needs bigger space to install.In order to prevent that lubricant oil is mixed in the DME fuel, the compressor that liquefies again need be non-lubricating type.Non-lubricating type compressor is often easily by locked.Because liquefaction needs high compression ratio again, need high-energy to drive to liquefy again compressor and this may cause the energy loss of whole system.
The fuel system that the present invention relates to a kind of DME of being used for motor of considering the problems referred to above and making, it prevents the DME fuel leak in the firing chamber, and is installed in the vehicle, and does not need to be provided with the fuel purifying case and the compressor that liquefies again.
Summary of the invention
Provide a kind of DME of use to act as a fuel according to an aspect of the present invention and be used for the fuel system of DME motor, comprised fuel tank, supply pump, low-pressure fuel service duct, high pressure supply pump, high-pressure fuel supply passage, oil sprayer, low-pressure fuel recovery approach and low-voltage solenoid valve.Fuel tank storage DME is as the fuel of DME motor.Supply pump on normal direction, rotate with the DME supply of fuel in the described fuel tank to the low-pressure fuel service duct, and on oppositely rotation with the DME fuel recovery to fuel tank.The high pressure supply pump is connected to described low-pressure fuel service duct, and DME fuel is fed to described high pressure supply pump from described supply pump.DME fuel is pressurized and from its discharge in the high pressure supply pump.The DME fuel that the high-pressure fuel supply channel allocation is discharged from described high pressure supply pump.Oil sprayer sprays from the next DME fuel of described high-pressure fuel supply channel allocation.The first fuel recovery passage is connected to described low-pressure fuel service duct with described high-pressure fuel supply passage.First solenoid valve opens and closes the described first fuel recovery passage.When motor moves, the described first fuel recovery passage of described first closed electromagnetic valve.When engine shutdown; described first solenoid valve is opened the rotation on oppositely of the described first fuel recovery passage and described supply pump, in the described thus low-pressure fuel service duct and the DME fuel in the described high-pressure fuel supply passage be recycled in the described fuel tank.
To know other aspects of the present invention and advantage in conjunction with the accompanying drawing that illustrates the principle of the invention by example from following explanation.
Description of drawings
The feature of the present invention that is regarded as having novelty is set forth in claims especially.Following detailed description by the reference currently preferred embodiment and in conjunction with the accompanying drawings can be understood the present invention and purpose and advantage best, in the accompanying drawing:
Fig. 1 is the block diagram that is used for the fuel system of DME motor according to first preferred embodiment of the invention;
Fig. 2 is the block diagram that is used for the fuel system of DME motor according to second preferred embodiment of the invention;
Fig. 3 is the block diagram that is used for the fuel system of DME motor according to third preferred embodiment of the invention; With
Fig. 4 is the block diagram that is used for the fuel system of DME motor according to four preferred embodiment of the invention.
Embodiment
The fuel system that is used for the DME motor below with reference to Fig. 1 explanation according to first preferred embodiment of the invention.With reference to Fig. 1, the fuel system 1 that is used for the DME motor has the fuel tank 2 of storing the DME that acts as a fuel.In fuel tank 2, the DME fuel quantity ga(u)ge of gas phase is shown gas phase part 2a, and the DME fuel quantity ga(u)ge of liquid phase is shown liquid phase part 2b.Comprise supply pump 3 in the fuel tank 2.Supply pump 3 is connected to low-pressure fuel service duct 4.Overcurrent shut off valve 5 is arranged in low-pressure fuel service duct 4.Overcurrent shut off valve 5 prevents that DME fuel flows out to outside the system when the fuel feed passage fracture takes place.
Supply pump 3 is electrodynamic type gear pumps that motor wherein is installed.Supply pump 3 is connected to energy (not shown) by motor power cables 20.Cable 20 has switch 21 being connected with conversion U phase, V phase and W phase.Supply pump 3 rotates on normal direction, perhaps rotates in the opposite direction by diverter switch 21.Switch 21 is electrically connected to electronic computer unit (after this being called ECU) 22.Switch 21 is switched by ECU22, and supply pump 3 rotates on normal direction when motor moves thus, and rotation on oppositely when motor stops.
High pressure supply pump 7 as high-pressure service pump is connected to supply pump 3 by low-pressure fuel service duct 4 at discharge port 3a.Low-pressure fuel service duct 4 is positioned at the upstream side of high pressure supply pump 7.Solenoid valve 6 as the 3rd solenoid valve is positioned at low-pressure fuel service duct 4 to open and close low-pressure fuel service duct 4.The 3rd solenoid valve 6 is electrically connected to ECU22.ECU22 controls the operation of the 3rd solenoid valve 6, and the 3rd solenoid valve 6 is opened when motor moves, and closes when motor stops.High pressure supply pump 7 is by unshowned power operation, and the driving power of high pressure supply pump 7 comes from the motor transmission.DEM fuel is fed to high pressure supply pump 7 from low-pressure fuel service duct 4, and pressurized and discharge from pump 7.
Rail 9 is connected to high pressure supply pump 7 by the first high pressure service duct 8 altogether.Rail 9 is connected to oil sprayer 11 by the second high-pressure fuel supply path 10 altogether.Each cylinder of motor all has corresponding oil sprayer 11.Oil sprayer 11 has nozzle 11a and leak port 11b.Excessive DME fuel is discharged to outside the system 1 by leak port 11b.DME fuel with high pressure is assigned with from being total to rail 9, and is ejected in the (not shown) of firing chamber by nozzle 11a.The high-pressure fuel supply passage is made of the first high-pressure fuel supply passage 8 that is positioned at high pressure supply pump 7 downstream sides, common rail 9 and the second high-pressure fuel supply path 10.
Fuel system 1 comprises fuel recovery passage 12.Fuel recovery passage 12 comprises the passage 12g that crosses.The end of passage 12g of crossing is connected to the upstream side of the overcurrent shut off valve 5 of low-pressure fuel service duct 4.The other end of passage 12g of crossing is connected to the first branched bottom 12a and the 3rd branched bottom 12c at point of branching 12d.The passage 12g that crosses is connected to the second branched bottom 12b at point of branching 12e.The first fuel recovery passage is made of the passage 12g that crosses, the first branched bottom 12a and the second branched bottom 12b.Branched bottom 12a, 12b, 12c can be incorporated among the passage 12g that crosses of fuel recovery passage 12, and the passage 12g that crosses has solenoid valve 15 with the opening and closing passage 12g that crosses.The first branched bottom 12a is connected to common rail 9, and has solenoid valve 13 to open and close branched bottom 12a.The second branched bottom 12b is connected to the first high-pressure fuel supply passage 8 and has solenoid valve 14 to open and close the second branched bottom 12b. Solenoid valve 13,14,15 is electrically connected to ECU22.The operation of ECU22 control electromagnetic valve 13,14,15, and solenoid valve 13,14,15 cuts out when motor moves, and solenoid valve 13,14,15 is opened when engine shutdown. Solenoid valve 13,14,15 is used separately as first solenoid valve to open and close the first fuel recovery passage 12a, 12b, 12g.
The 3rd branched bottom 12c is connected to the leak port 11b of oil sprayer 11.The end of the 4th branched bottom 12h is connected to fuel recovery passage 12 at the tie point 12f place between the point of branching 12e and first solenoid valve 15.The other end of the 4th branched bottom 12h is connected to the gas phase part 2a in the fuel tank 2.The 4th branched bottom 12h has second solenoid valve 16 to open and close the 4th branched bottom 12h.Second solenoid valve 16 is electrically connected to ECU22.Second solenoid valve 16 is opened when power operation, and closes when engine shutdown.The second fuel recovery passage is made of a part (between point of branching 12d and tie point 12f) and the 4th branched bottom 12h of the 3rd branched bottom 12c, the passage 12g that crosses.
The operation of the fuel system that is used for the DME motor of first preferred embodiment below will be described.As described in Figure 1, the DME fuel reservoir is in the fuel tank 2 of fuel system 1.When power operation, ECU22 control switch 21, supply pump 3 rotates on normal direction thus, and the discharge port 3a of the DME fuel in the fuel tank 2 by supply pump 3 is fed to low-pressure fuel service duct 4.The 3rd solenoid valve 6 controlled opening when motor moves, and DME fuel is supplied to high pressure supply pump 7 by low-pressure fuel service duct 4.
Pressurized high pressure supply pump 7 from the low pressure DME fuel of low-pressure fuel service duct 4 supply, and be discharged to the first high-pressure fuel supply passage 8 to be fed to common rail 9 from high pressure supply pump 7.DME fuel is assigned to each oil sprayer 11 by the second high-pressure fuel supply path 10 then.Oil sprayer 11 is ejected into the firing chamber by nozzle 11a with high pressure DME fuel.The DME fuel that is ejected into the firing chamber carries out ignition by compression and burning, is similar to the ordinary diesel oil machine.
When DME fuel when fuel tank 2 is supplied to the firing chamber, DME fuel flows among the first branched bottom 12a and the second branched bottom 12b. Solenoid valve 13,14 cuts out when motor moves, and has prevented that thus the first high-pressure fuel supply passage 8 and the DME fuel that is total in the rail 9 from flowing in the fuel tank 2 by the first branched bottom 12a, the second branched bottom 12b and the passage 12g that crosses.Second solenoid valve 16 is opened when motor moves, and the DME fuel of discharging from the leak port 11b of oil sprayer 11 is recovered to the fuel tank 2 by the 3rd branched bottom 12c, cross passage 12g and the 4th branched bottom 12h thus.Solenoid valve 15 cuts out when motor moves, and prevents from thus to flow into the low-pressure fuel service duct 4 from the DME fuel that the leak port 11b of oil sprayer 11 discharges.
When engine shutdown, stop the injection of DME fuel, and stop the flowing of DME fuel in the fuel system 1 from oil sprayer 11 to the firing chamber.Therefore, the DME fuel with high pressure remains on the downstream side of high pressure supply pump 7, and the DME fuel with low pressure remains on the upstream side of pump 7.DME fuel with high pressure remain among the first branched bottom 12a than in the part of solenoid valve 13 more approaching rails 9 altogether and in the second branched bottom 12b than solenoid valve 14 more in the part near the first high-pressure fuel supply passage 8.
Solenoid valve 13,14 is opened when engine shutdown.The first high-pressure fuel supply passage 8 and common rail 9 are communicated with the passage 12g that crosses by the first branched bottom 12a and the second branched bottom 12b.When engine shutdown, solenoid valve 15 is opened, and low-pressure fuel service duct 4 is connected to the passage 12g that crosses.When engine shutdown, ECU22 switches to switch supply pump 3 is rotated on oppositely.Therefore, the DME fuel that remains on high pressure supply pump 7 downstream sides is inhaled in the supply pump 3, and is recovered in the fuel tank 12 by the first branched bottom 12a or the second branched bottom 12b, cross passage 12g and low-pressure fuel service duct 4.The passage 12g that crosses is connected to low-pressure fuel service duct 4 at the upstream side of overcurrent shut off valve 5, and overcurrent shut off valve 5 can not interfere the DME fuel recovery in fuel tank 2.
DME fuel with low pressure is retained in the low-pressure fuel service duct 4, and also is inhaled in the supply pump 3.Therefore, the DME fuel that is retained in high pressure supply pump 7 upstream sides is recycled in the fuel tank 2.The 3rd solenoid valve 6 cuts out when engine shutdown, and is retained in the downstream side that DME fuel in the low-pressure fuel service duct 4 can not flow to high pressure supply pump 7.Second solenoid valve 16 cuts out when engine shutdown, and the DME fuel in the fuel tank 2 can not flow among the passage 12g that crosses by the 4th branched bottom 12h.Suppose that the recovery DME fuel in the fuel tank 2 is the state that gas phase and liquid phase are mixed.Be recovered to gas phase DME fuel in the fuel tank 2 and in fuel tank 2, be cooled and trend towards changing into liquid phase, because fuel tank 2 has than low-pressure fuel service duct 4, the first high-pressure fuel supply passage 8 and the bigger radiating effect of the second high-pressure fuel supply path 10.
As mentioned above, the upstream side of high pressure supply pump 7 is connected with 12b (low-pressure fuel recovery approach) with the passage 12g that crosses, the first and second branched bottom 12a with the downstream side.The first fuel recovery passage comprises that solenoid valve 13,14,15 (first solenoid valve) is to open and close the first fuel recovery passage.When motor moves, first closed electromagnetic valve.When engine shutdown; first solenoid valve is opened, and supply pump 3 rotation on oppositely be retained in recovery the first high-pressure fuel supply passage 8, altogether the DME fuel in rail 9 and second high-pressure fuel supply path 10 (high-pressure fuel supply passage) and the low-pressure fuel service duct 4 in fuel tank 2.Therefore, when engine shutdown, the DME fuel that is retained in high-pressure fuel supply passage and the low-pressure fuel service duct 4 can not leak into the firing chamber from oil sprayer 11.In addition, this embodiment's fuel system can be installed to vehicle, because this fuel system does not have the fuel purifying case and the compressor that liquefies again.
Rail 9 constitutes the part of high-pressure fuel supply passage altogether.Rail 9 is connected to the first branched bottom 12a altogether, and the DME fuel that is retained in the common rail 9 is reclaimed reliably.In addition; the end of passage 12g of crossing is connected to low-pressure fuel service duct 4 at the upstream side of overcurrent shut off valve 5; therefore the DME fuel that is retained in when engine shutdown in the high-pressure fuel supply passage is recovered in the fuel tank 2 effectively, and can not be subjected to the obstruction of overcurrent shut off valve 5.Oil sprayer 11 is connected to the gas phase part 2a of fuel tank 2 by the 3rd branched bottom 12c, cross passage 12g and the 4th branched bottom 12h (the second fuel recovery passage), and second solenoid valve 16 is arranged in the 4th branched bottom 12h to open and close the second fuel recovery passage.Second solenoid valve 16 is opened when motor moves.Therefore, the excessive DME fuel of discharging from oil sprayer 11 when motor moves is recycled to the fuel tank 2.When engine shutdown, second solenoid valve 16 cuts out, and the DME fuel in the fuel tank 2 can not flow among the passage 12g that crosses by the 4th branched bottom 12h.
In addition, the 3rd solenoid valve 6 is arranged in low-pressure fuel service duct 4.Therefore the 3rd solenoid valve 6 cuts out when engine shutdown, is retained in the downstream side that DME fuel in the low-pressure fuel service duct 4 can not flow to high pressure supply pump 7.
The fuel system that is used for the DME motor of second preferred embodiment is described with reference to Fig. 2 below.The structure similar to first embodiment represent with same numeral, and no longer repeat the explanation to same parts.Second embodiment and first embodiment difference structurally are that the gas phase part 2a of fuel tank 2 is connected to the high pressure side of high pressure supply pump 7 by solenoid valve.
Fig. 2 shows the fuel system 30 that is used for the DME motor.The gas phase part 2a of fuel tank 2 is connected to the high pressure side of high pressure supply pump 7 by the 3rd fuel recovery passage 31.The 3rd fuel recovery passage 31 comprises that the 4th solenoid valve 32 is to open and close the 3rd fuel recovery passage 31.The 4th solenoid valve 32 is electrically connected to ECU33.The 4th solenoid valve 32 is controlled to cut out when motor moves, and opens when engine shutdown.ECU33 not only controls the operation of the 4th solenoid valve 32, and the operation of control electromagnetic valve 6,13,14,15,16 and switch 21, and is similar to the ECU22 among first embodiment.
The gas phase part 2a of fuel tank 2 is connected to the high pressure side of high pressure supply pump 7.Therefore, fuel system 30 makes and keeps the DME fuel pressure of high pressure conditions to equate with pressure (saturated vapor pressure) in the fuel tank 2 in high pressure supply pump 7 downstream sides.In other words, the pressure that is retained in the DME fuel in high pressure supply pump 7 downstream sides was reduced than stage morning, and DME fuel can not be easy to leak into the firing chamber from oil sprayer 11.
The fuel system that is used for the DME motor of the 3rd preferred embodiment is described hereinafter with reference to Fig. 3.The structure similar to first embodiment represent with same numeral, and no longer repeat the explanation to same parts.Except first embodiment, the 3rd embodiment also comprises sparger.When behind the engine shutdown during through the scheduled time, the liquid phase DME fuel in the fuel tank 2 is used as stream with the operation sparger, and sprayer pumps gas phase DME fuel with the DME fuel recovery to fuel tank 2.
Fig. 3 shows the fuel system 41 that is used for the DME motor, and it comprises sparger 44.Sparger 44 comprises supply port 44a, discharges port 44b and suction ports 44c.DME fuel is supplied to sparger 44 by supply port 44a, and sparger 44 is to spray DME fuel at a high speed in sparger 44.Utilize the pressure at suction ports 44c place when spraying to reduce, the DME fuel that sparger 44 passes through in the suction ports 44c suction of fuel recovery approach 12, and will be discharged to fuel tank 2 by discharging port 44b by the DME fuel of supply port 44a supply with by the DME fuel both that suction ports 44c aspirates.
The supply port 44a of sparger 44 is connected to an end of stream service duct 42 to drive sparger 44.The other end of stream service duct 42 is connected to low-pressure fuel service duct 4 at the tie point 4a place between overcurrent shut off valve 5 and the 3rd solenoid valve 6.Stream service duct 42 comprises that the 6th solenoid valve 43 is to open and close stream service duct 42.The 6th solenoid valve 43 is connected to ECU48.ECU48 controls the 6th solenoid valve 43.The 6th solenoid valve 43 cuts out when motor moves.By the control of ECU48, during when engine shutdown and up to process scheduled time t, the 6th solenoid valve 43 cuts out, and when having passed through scheduled time t behind the engine shutdown, valve 43 is opened.The discharge port 44b of sparger 44 is connected to an end of discharge route 45.The other end of discharge route 45 is connected to the gas phase part 2a of fuel tank 2.
Therefore; when behind engine shutdown, having passed through scheduled time t; supply pump 3 operation, and the DME fuel in the fuel tank 2 is fed to supply port 44a by stream service duct 42, and DME fuel returns fuel tank 2 by discharging port 44b and discharge route 45 then.
The suction ports 44c of sparger 44 is connected to an end of suction channel 46.The other end of suction channel 46 is connected to the passage 12g that crosses of fuel recovery passage 12 at the tie point 12j place between point of branching 12e and tie point 12f.Suction channel 46 comprises that the 5th solenoid valve 47 is to open and close suction channel 46.The 5th solenoid valve 47 is electrically connected to ECU48.The 5th solenoid valve 47 is controlled by ECU48.Be similar to the 6th solenoid valve 43, the 5th solenoid valve 47 cuts out when motor moves.The 5th solenoid valve also is closed and has passed through scheduled time t behind engine shutdown.The 5th solenoid valve 47 is opened when having passed through scheduled time t behind the engine shutdown.
ECU48 controls the operation of the 6th solenoid valve 43 and the 5th solenoid valve 47.Through scheduled time t, ECU48 is control electromagnetic valve 6,13,14,15 and 16 and the operation of switch 21 also, is similar to the ECU22 among first embodiment when motor moves and behind engine shutdown.When having passed through scheduled time t behind the engine shutdown, ECU48 closes solenoid valve 15, and throw over switch 21 so that supply pump 3 rotate in normal direction.Other similar are in first embodiment.Table 1 shows the operation of supply pump 3, the 3rd solenoid valve 6, first solenoid valve 13,14,15, second solenoid valve 16, the 6th solenoid valve 43 and the 5th solenoid valve 47.
When motor moves When engine shutdown (through before the scheduled time t) When engine shutdown (through after the scheduled time t)
?---- Reclaim liquid phase DME Reclaim gas phase DME
The 3rd solenoid valve 6 ON (opening) OFF (closing) OFF (closing)
Solenoid valve 13 OFF (closing) ON (opening) ON (opening)
Solenoid valve 14 OFF (closing) ON (opening) ON (opening)
Solenoid valve 15 OFF (closing) ON (opening) OFF (closing)
Second solenoid valve 16 ON (opening) OFF (closing) OFF (closing)
The 5th solenoid valve 47 OFF (closing) OFF (closing) ON (opening)
The 6th solenoid valve 43 OFF (closing) OFF (closing) ON (opening)
Supply pump 3 Normal rotation Counterrotating Normal rotation
Table 1 is according to the operation of the 3rd embodiment's solenoid valve and supply pump
Operation with reference to the fuel system that is used for the DME motor 41 of Fig. 3 and table 1 explanation the 3rd preferred embodiment.When motor moved, supply pump 3 rotated on normal direction, and the DME fuel in the fuel tank 2 is fed to high pressure supply pump 7 by low-pressure fuel service duct 4.The 6th solenoid valve 43 as shown in table 1 and the 5th solenoid valve 47 are closed, and the DME fuel in the low-pressure fuel service duct 4 does not flow into sparger 44.When engine shutdown, supply pump 3 is rotation on oppositely, with suction be retained in the low-pressure fuel service duct 4 and high pressure supply pump 7 downstream sides on DME fuel, DME fuel is recycled in the fuel tank 2 then.The 6th solenoid valve 43 as shown in table 1 and the 5th solenoid valve 47 are closed, and the DME fuel among the passage 12g that crosses of low-pressure fuel service duct 4 and fuel recovery passage 12 can not flow in the sparger 44.Therefore, the motor run duration and behind the engine shutdown up to through during the scheduled time t, fuel system 41 is similar to the fuel system 1 ground operation among first embodiment.Scheduled time t almost completely is recovered and remains the time that DME fuel is mainly gas phase by the counterrotating of supply pump 3 from engine shutdown until liquid phase DME fuel.
As shown in table 1, when having passed through scheduled time t behind the engine shutdown, the 6th solenoid valve 43 and the 5th solenoid valve 47 are opened.As shown in Figure 3, low-pressure fuel service duct 4 is connected to the supply port 44a of sparger 44 by stream service duct 42, and the passage 12g that crosses is connected to the suction ports 44c of sparger 44 by suction channel 46.When having passed through scheduled time t behind the engine shutdown, the solenoid valve 15 and second solenoid valve 16 are closed.Therefore the connection that crosses between passage 12g and the low-pressure fuel service duct 4 is disconnected by solenoid valve 15, and the connection between the gas phase part 2a of cross passage 12g and fuel tank 2 disconnects by second solenoid valve 16.
When having passed through scheduled time t behind the engine shutdown, supply pump 3 rotates on normal direction, and the DME fuel of liquid phase in the fuel tank 2 is discharged in the low-pressure fuel service duct 4.Because the 3rd solenoid valve 6 cuts out when engine shutdown, the DME fuel that is discharged in the low-pressure fuel service duct 4 can not flow in the high pressure supply pump 7, but flows through tie point 4a and stream service duct 42, to be supplied to the supply port 44a of sparger 44.The DME fuel that is fed to the supply port 44a of sparger 44 sprays in sparger 44 with high speed.Pressure at suction ports 44c place when utilizing injection reduces, and sparger 44 is retained in the DME fuel in high pressure supply pump 7 downstream sides by the passage 12g that crosses, suction channel 46 and suction ports 44c suction.Second solenoid valve 16 cuts out when engine shutdown, and the DME fuel of gas phase can not flow among the passage 12g that crosses by the 4th branched bottom 12h in the fuel tank 2.Sparger 44 therein will be by supply port 44a supply DME fuel and the DME fuel mix by suction ports 44c suction, and the DME fuel that mixes is discharged to discharge route 45 by discharging port 44b, and turns back to fuel tank 12.
Therefore, the DME fuel in the fuel tank 2 is supplied to the supply port 44a of sparger 44.The DME fuel that is retained in high pressure supply pump 7 downstream sides is sucked in the sparger 44 by suction channel 46 and suction ports 44c.DME fuel is recycled in the fuel tank 2 by discharging port 44b and discharge route 45.When having passed through scheduled time t behind the engine shutdown, the DME fuel of gas phase is retained in the downstream side of high pressure supply pump 7.Supply pump 3 rotates on normal direction, and the liquid phase DME fuel in the fuel tank 2 is discharged.Therefore, non-lubricating status may take place to have prevented that only gas phase DME fuel can circulate and prevent in supply pump 3.Therefore, improve the serviceability of supply pump 3, and improved the reliability of the fuel system 41 that is used for the DME motor.Stream service duct 42 is connected to low-pressure fuel service duct 4, and stream service duct 42 has the 6th solenoid valve of having opened when having passed through scheduled time t behind engine shutdown 43.Therefore, part low-pressure fuel service duct 4 is used to supply DME fuel to sparger 44, and the pipe-line system that is used for the fuel system 41 of DME motor is simplified, and has reduced the size of fuel system 41.
The fuel system of the 4th preferred embodiment is described hereinafter with reference to Fig. 4.The 4th embodiment and the 3rd embodiment difference structurally are that electromagnetic switching valve and supply pump integrate, and the stream service duct directly connects fuel tank 2 and sparger 44.
Fig. 4 shows the fuel system 51 that is used for the DME motor.The fuel tank 2 of fuel system 51 comprises supply pump 52 wherein.Supply pump 52 has the port of discharge 52a, 52b.Discharge port 52a and be connected to low-pressure fuel service duct 4.Discharge port 52b and be connected to an end that flows service duct 53.The other end of stream service duct 53 is connected to the supply port 44a of sparger 44.
Supply pump 52 has electromagnetic switching valve 52c.By conversion electromagnetic switching valve 52c, the pressing chamber (not shown) of supply pump 52 is connected to discharges port 52a or discharges port 52b.Electromagnetic switching valve 52c is electrically connected to ECU54, and is controlled to switch in pressing chamber and discharges being connected between port 52a and the 52b.When having passed through scheduled time t when motor moves or behind engine shutdown, pressing chamber is connected to discharges port 52a.When having passed through scheduled time t behind engine shutdown, pressing chamber is connected to discharges port 52b.ECU54 changes electromagnetic switching valve 52c and the operation of control electromagnetic valve 6,13,14,15,16,47 and the conversion of switch 21, is similar to the 3rd embodiment's ECU48.Table 2 shows the operation of the 3rd solenoid valve 6, solenoid valve 13,14,15 and second solenoid valve 16, the 5th solenoid valve 47, supply pump 52 and electromagnetic switching valve 52c.Other similar are in the 3rd embodiment.
When motor moves When engine shutdown (through before the scheduled time t) When engine shutdown (through after the scheduled time t)
Reclaim liquid phase DME Reclaim gas phase DME
The 3rd solenoid valve 6 ON (opening) OFF (closing) OFF (closing)
Solenoid valve 13 OFF (closing) ON (opening) ON (opening)
Solenoid valve 14 OFF (closing) ON (opening) ON (opening)
Solenoid valve 15 OFF (closing) ON (opening) OFF (closing)
Second solenoid valve 16 ON (opening) OFF (closing) OFF (closing)
The 6th solenoid valve 43 OFF (closing) OFF (closing) OFF (closing)
Supply pump 52 Normal rotation Counterrotating Normal rotation
Electromagnetic switching valve 52c (being communicated to) Discharge port 52a Discharge port 52a Discharge port 52b
Table 2 is according to the operation of the 4th embodiment's solenoid valve and supply pump
Be used for the operation of the fuel system 51 of DME motor with reference to Fig. 4 and table 2 explanation.As shown in table 2, when motor moved, supply pump 52 rotated on normal direction, and pressing chamber is connected to discharge port 52a by electromagnetic switching valve 52c.When engine shutdown, supply pump 52 counterrotatings, and supply pump 52 is connected to discharge port 52a by electromagnetic switching valve 52c.Therefore, up to behind engine shutdown through scheduled time t, fuel system 51 and the 3rd embodiment's fuel system 41 is operated similarly.Therefore, DME fuel can not flow into and discharge the stream service duct 53 that port 52b is connected, and DME can not be fed to the supply port 44a of sparger 44.
When behind the engine shutdown during through scheduled time t, supply pump 3 rotates on normal direction, and the pressing chamber of supply pump 3 is connected to by electromagnetic switching valve 52c and discharges port 52b.Therefore, the DME fuel in the fuel tank 2 is discharged to stream service duct 53, and is fed to the supply port 44a of sparger 44.When behind the engine shutdown during through scheduled time t, the 5th solenoid valve 47 is opened.Therefore, by be fed to the DME fuel stream of sparger 44 via stream service duct 53, the gas phase DME fuel that is retained in high pressure supply pump 7 downstream sides is sucked in the sparger 44 by suction channel 46.
As mentioned above, discharge port 52a and be connected to low-pressure fuel service duct 4, and discharge port 52b connection stream service duct 53.Discharging port 52a, 5b switches with the electromagnetic switching valve 52c that is connected by supply pump 52 between the pressing chamber.In other words, when motor moves or behind engine shutdown,, discharge the pressing chamber that port 52a is connected to supply pump 52, and after passing through scheduled time t, discharge the pressing chamber that port 52b is connected to supply pump 52 through scheduled time t.Therefore, the 4th embodiment has the effect identical with the 3rd embodiment.
Therefore, this example and embodiment should be regarded as illustrating and be unrestricted, and the details that the invention is not restricted to herein provide, and can make amendment within the scope of the appended claims.

Claims (8)

1. fuel system that uses DME to act as a fuel to be used for the DME motor comprises:
Storage is as the fuel tank (2) of the DME of DME motor fuel;
Rotation is with the supply pump (3,52) from described fuel tank (2) supply DME fuel on normal direction;
Be connected to the low-pressure fuel service duct (4) of described supply pump (3,52);
Be connected to the high pressure supply pump (7) of described low-pressure fuel service duct (4), DME fuel is fed to its described high pressure supply pump (7) and discharges from it to this DME fuel pressurization and with this DME fuel from described supply pump (3,52) by described low-pressure fuel service duct (4);
Distribution is from the high-pressure fuel supply passage (8,9,10) of the DME fuel of described high pressure supply pump (7) discharge;
Injection distributes the oil sprayer (11) of the DME fuel that comes from described high-pressure fuel supply passage (8,9,10); described fuel system is characterised in that; the first fuel recovery passage (12a, 12b is 12g) with described high-pressure fuel supply passage (8; 9; 10) be connected to described low-pressure fuel service duct (4), wherein first solenoid valve (13,14; 15) open and close the described first fuel recovery passage (12a; 12b, 12g), wherein when motor moves; described first solenoid valve (13; 14,15) close described first fuel recovery passage (12a, the 12b; 12g); and wherein when engine shutdown, described first solenoid valve (13,14; 15) open the described first fuel recovery passage (12a; 12b, 12g) and the rotation on oppositely of described supply pump, the described high-pressure fuel supply passage (8 of described thus low-pressure fuel service duct (4) neutralization; 9,10) the DME fuel in is recycled in the described fuel tank (2).
2. the fuel system that is used for the DME motor according to claim 1, it is characterized in that, described high-pressure fuel supply passage (8,9,10) comprise common rail (9), and (12a, 12b 12g) comprise first branched bottom (12a) that is connected to described common rail (9) to the wherein said first fuel recovery passage.
3. the fuel system that is used for the DME motor according to claim 1, it is characterized in that, described low-pressure fuel service duct (4) comprises overcurrent shut off valve (5), and the wherein said first fuel recovery passage (12a, 12b, 12g) upstream side at described overcurrent shut off valve (5) is connected to described low-pressure fuel service duct (4).
4. the fuel system that is used for the DME motor according to claim 1 is characterized in that (12c, 12h 12g) are connected to described oil sprayer (11) the gas phase part (2a) of described fuel tank (2) to the second fuel recovery passage; Wherein second solenoid valve (16) opens and closes the described second fuel recovery passage (12c; 12h; 12g); wherein described second solenoid valve (16) is opened the described second fuel recovery passage (12c when motor moves; 12h, 12g), and wherein when engine shutdown described second solenoid valve (16) close the described second fuel recovery passage (12c; 12h, 12g).
5. the fuel system that is used for the DME motor according to claim 1; it is characterized in that; the 3rd solenoid valve (6) opens and closes described low-pressure fuel service duct (4); wherein described the 3rd solenoid valve (6) is opened described low-pressure fuel service duct (4) when motor moves, and wherein when engine shutdown described the 3rd solenoid valve (6) close described low-pressure fuel service duct (4).
6. the fuel system that is used for the DME motor according to claim 1; it is characterized in that: the 3rd fuel recovery passage (31) connects the high pressure side of described high pressure supply pump (7) and the gas phase part (2a) of described fuel tank (2); wherein the 4th solenoid valve (32) opens and closes described the 3rd fuel recovery passage (31); wherein described the 4th solenoid valve (32) cuts out described the 3rd fuel recovery passage (31) when motor moves, and wherein when engine shutdown described the 4th solenoid valve (32) open described the 3rd fuel recovery passage (31).
7. the fuel system that is used for the DME motor according to claim 1; it is characterized in that; sparger (4 4) has supply port (44a); discharge port (44b) and suction ports (44c); wherein reduce sparger (44) by suction ports (44c) suction DME fuel by utilizing DME fuel to flow to the pressure of discharging port (44b) from supply port (44a); wherein flow service duct (42; 53) by supply pump (3; 52) with the supply port (44a) of the DME supply of fuel in the fuel tank (2) to sparger (44); wherein suction channel (46) connects the described first fuel recovery passage (12a; 12b; 12g) and the suction ports (44c) of described sparger (44); wherein the 5th solenoid valve (47) opens and closes described suction channel (46); and discharge route (45) connects the gas phase part (2a) of the discharge port (44b) of sparger (44) to fuel tank (2); wherein when passing through the scheduled time (t) behind the engine shutdown; described the 5th solenoid valve (47) is opened described suction channel (46); and described supply pump (3; 52) on normal direction, rotate so that the DME fuel in the fuel tank (2) is passed through described stream service duct (42; 53) be fed to the supply port (44a) of described sparger (44); wherein said high pressure service duct (8; 9; 10) and the described first fuel recovery passage (12a; 12b, 12g) the DME fuel in is fed to described sparger (44) so that this DME fuel recovery is arrived in the fuel tank (2) by described suction channel (46).
8. the fuel system that is used for the DME motor according to claim 7; it is characterized in that; described stream service duct (42) connects the supply port (44a) of described low-pressure fuel service duct (4) and described sparger (44); wherein said the 6th solenoid valve (43) opens and closes described stream service duct (42), and wherein when having passed through the described scheduled time (t) behind the engine shutdown described the 6th solenoid valve (43) open described stream service duct (42).
CNA2007101370379A 2006-07-20 2007-07-19 Fuel supply system for DME engine Pending CN101109343A (en)

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JP2006198252 2006-07-20
JP2006198252 2006-07-20
JP2007002471 2007-01-10

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102482962A (en) * 2009-06-19 2012-05-30 洋马株式会社 Method for controlling stoppage of reduction of blow-by gas in starting
CN107923351A (en) * 2015-08-17 2018-04-17 株式会社电装 Fuel feed system
CN109728327A (en) * 2019-02-26 2019-05-07 河北工业大学 Common-rail injection system and fuel cell system and vehicle with it
CN111520259A (en) * 2020-04-30 2020-08-11 南方科技大学 Ignition type methanol engine combustion system and control method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102482962A (en) * 2009-06-19 2012-05-30 洋马株式会社 Method for controlling stoppage of reduction of blow-by gas in starting
CN102482962B (en) * 2009-06-19 2014-01-29 洋马株式会社 Method for controlling stoppage of reduction of blow-by gas in starting
CN107923351A (en) * 2015-08-17 2018-04-17 株式会社电装 Fuel feed system
CN107923351B (en) * 2015-08-17 2020-08-18 株式会社电装 Fuel supply system
CN109728327A (en) * 2019-02-26 2019-05-07 河北工业大学 Common-rail injection system and fuel cell system and vehicle with it
CN111520259A (en) * 2020-04-30 2020-08-11 南方科技大学 Ignition type methanol engine combustion system and control method
CN111520259B (en) * 2020-04-30 2023-08-18 南方科技大学 Ignition type methanol engine combustion system and control method

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