US20110011369A1 - Arrangement and Method for an Internal Combustion Engine with Direct Dual Fuel Injection - Google Patents

Arrangement and Method for an Internal Combustion Engine with Direct Dual Fuel Injection Download PDF

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Publication number
US20110011369A1
US20110011369A1 US12/920,593 US92059309A US2011011369A1 US 20110011369 A1 US20110011369 A1 US 20110011369A1 US 92059309 A US92059309 A US 92059309A US 2011011369 A1 US2011011369 A1 US 2011011369A1
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Prior art keywords
fuel
pressure
line
pump
pressure pump
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Abandoned
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US12/920,593
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English (en)
Inventor
Maria Servatius Alfons Jaasma
Piet Van Eijck
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Vialle Alternative Fuel Systems BV
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Vialle Alternative Fuel Systems BV
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Priority claimed from NL2001345A external-priority patent/NL2001345C2/nl
Application filed by Vialle Alternative Fuel Systems BV filed Critical Vialle Alternative Fuel Systems BV
Assigned to VIALLE ALTERNATIVE FUEL SYSTEMS B.V. reassignment VIALLE ALTERNATIVE FUEL SYSTEMS B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JAASMA, MARIA SERVATIUS ALFONS, VAN EIJCK, PIET
Publication of US20110011369A1 publication Critical patent/US20110011369A1/en
Assigned to MONARCH HOLDINGS B.V. reassignment MONARCH HOLDINGS B.V. PLEDGE AGREEMENT Assignors: VIALLE ALTERNATIVE FUEL SYSTEMS B.V.
Assigned to GREEN WING GROUP, INC. reassignment GREEN WING GROUP, INC. ROYALTY FREE RIGHT OF USE LICENSE Assignors: MONARCH HOLDINGS B.V., VIALLE ALTERNATIVE FUEL SYSTEMS B.V.
Assigned to VIALLE GROUP BV reassignment VIALLE GROUP BV REMOVAL OF ROYALTY FREE RIGHT OF USE LICENSE Assignors: GREEN WING GROUP, INC.
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B17/00—Engines characterised by means for effecting stratification of charge in cylinders
    • F02B17/005—Engines characterised by means for effecting stratification of charge in cylinders having direct injection in the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0613—Switch-over from one fuel to another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0684—High pressure fuel injection systems; Details on pumps, rails or the arrangement of valves in the fuel supply and return systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F02D19/0694—Injectors operating with a plurality of fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
    • F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel composition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of the fuel pressure
    • 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

Definitions

  • the invention relates to an arrangement for the supply of fuel to a combustion engine with direct injection.
  • the invention also relates to a method for such a combustion engine and, in particular, to switching between two fuels.
  • a combustion engine can use two fuels, and in particular a liquefied gas fuel such as LPG and a liquid fuel such as diesel or petrol.
  • the fuels are fed from their respective storage tanks to the combustion engine.
  • the fuel is injected under high pressure directly into the combustion chamber by means of a high-pressure pump mounted onto the engine.
  • a direct injection arrangement as such is advantageous to the consumption of fuel by the engine.
  • a bi-fuel engine with a high-pressure pump connected to an injector is known from JP 2002327658. Return lines 14-17 of the high-pressure pump feed an excess quantity of fuel back to the respective fuel storage tanks.
  • a problem in such systems is switching between the fuel types, particularly when switching from the gas fuel to the liquid fuel. Separate injection units for the various fuels are expensive. When the high-pressure pump is used for the direct injection of both fuels, an undesirable mixing of the fuels occurs. It is an objective of the invention to provide an arrangement and method wherein two fuels may be used, which can be produced at a low cost and that can operate reliably and, in particular, enable and/or improve switching between the fuels.
  • an arrangement according to the invention comprising at least one high-pressure pump connectable with the internal combustion engine for the direct injection of fuel, wherein the arrangement comprises at least two fuels for a first LPG fuel storage and a second liquid fuel storage.
  • the arrangement comprises at least two fuels for a first LPG fuel storage and a second liquid fuel storage.
  • at least two fuel lines of the two fuel storages lead to the inlet portion of the high-pressure pump.
  • the fuel lines may be jointly connected.
  • the fuel lines are capable of pumping the respective fuels to the pump.
  • the fuel lines are fitted with non-return valves. These valves are preferably mounted in close proximity to the junction of the fuel lines.
  • the valves are preferably mounted upstream of the junction of the fuel lines. The valves are therefore positioned between the junction and the fuel storage means.
  • the arrangement comprises a purge unit for purging the fuel line connected to the high-pressure pump, preferably the inlet of the pump, and possibly also to the high-pressure pump.
  • the inlet may be the inlet portion of the pump. Due to the presence of the purge unit, the fuel present in the fuel line connected to the high-pressure pump, in the inlet portion of the high-pressure pump and possibly also in the high-pressure pump itself, can be purged with the selected replacement fuel. This forces the replacement of the prevailing fuel by the new fuel. Switching to a replacement fuel is performed according to a switching procedure.
  • the purge unit can be actuated by the switching procedure and can be active for a limited period of time.
  • the purge unit performs a single purging action.
  • Purging can be accompanied by the accumulation of, for example, the newly selected fuel.
  • the newly selected fuel can be accumulated temporarily.
  • the purging action can be forced to occur and the prevailing fuel can be replaced by the accumulated fuel.
  • the use of the purge unit is already known from DE 20 2005 007 712, wherein two fuel systems with a high-pressure pump are also shown. However, this is not an LPG fuel system. Residual bio-fuel is purged from the high-pressure pump and injector with petrol, in particular before the engine is started. A fuel pump is used for the purging action. The purging action takes place, for example, when the temperature drops below 20 deg. Celsius. The fuels used have a similar density and pressure.
  • the purge unit can be arranged in order to equalize the pressure in the fuel line.
  • the purge unit according to the invention is preferably used for purging the LPG fuel from the fuel line and the inlet portion of the high-pressure pump and for the replacement thereof by (the low pressure vapour of) the liquid fuel, such as petrol. It is in fact when this switching procedure is performed that problems occur in prior art arrangements and this is because the pressure of the liquefied gas in the supply line of the high-pressure pump is higher than the pressure in the fuel storage for petrol.
  • the purge unit now enables said switch-over.
  • the purge unit comprises means for reducing or equalizing said pressure prior to switching over to the new fuel.
  • the pressure reduction means can be connected to a return line, for example. Pressure reduction can be achieved, for example, through a discharge and, more specifically, by means of a return line.
  • the arrangement may comprise a control unit, connected to the purge unit.
  • the control unit can be arranged for actuating the purge unit when switching from LPG to liquid fuel.
  • the control unit can be arranged for performing and controlling a number of steps required or switching from LPG to liquid fuel.
  • the control unit can be arranged for the timely actuation of the purge unit, in such a manner that this enables and/or improves the switch-over.
  • the purge unit is preferably filled with a petrol fuel. This enables the liquefied gas to be purged from the fuel line and the high-pressure pump when switching between fuels.
  • the purge unit is fitted to at least one of the fuel lines.
  • the purge unit can be incorporated in the fuel line from the liquefied fuel storage to the high-pressure pump.
  • the purge unit is arranged upstream of the high-pressure pump. Purging can then take place in the direction of the flow of fuel. In one embodiment an excess amount of fuel is supplied. The excess fuel can escape or can be returned to the fuel storage.
  • the purge unit comprises an intensifier for increasing the fuel pressure.
  • the increase is preferably only temporary.
  • the intensifier may be arranged for a single stroke for increasing the pressure.
  • the intensifier may be a displacement means which, for example, comprises two pistons with different diameters and a cylinder with a constriction.
  • Such an intensifier or pressure booster can force accumulated fuel through the constriction by a single stroke.
  • An outlet of the constriction is connected to the fuel line.
  • the compressed fuel can be purged through the fuel line and pump and in this manner preferably displaces the liquefied gas present in the fuel line.
  • the inlet or the inlet portion of the pump is also purged.
  • the purge unit is preferably a hydraulic pressure intensifier.
  • a pressure intensifier as such can be used effectively when switching is performed so that sufficient pressure build-up is achieved at a relatively low cost when switching between fuels.
  • the intensifier has a discharge with a return line to the fuel storage tank. Said discharge is preferably connected to the inlet side of the displacement means.
  • a control valve may be present in the return line. Accordingly, it is possible, for example, to bring the piston of one embodiment of the pressure intensifier back to the initial starting position.
  • the available fuel pump can be used for the supply and subsequent discharge of the fuel.
  • the fuel line further comprises a non-return valve in the form of a bypass of the displacement means.
  • This bypass is the ‘normal’ fuel line which, in the operational mode of the engine, essentially feeds the fuel from the storage tank to the high-pressure pump.
  • the purge unit is active during the switch-over mode.
  • the fuel lines of the different fuels merge at a line junction upstream of the high-pressure pump.
  • At least one fuel line preferably the fuel line of the liquefied gas, includes a return line to the fuel storage tank upstream of said junction.
  • the fuel control unit (ECU) present in the system can be used for controlling the supply of the original fuel, diesel or petrol.
  • An LPE can be applied as a control unit for the LPG fuel in the conversion.
  • either an adaptation of the ECU would suffice in the embodiment according to the invention, or an adaptation to an input of the ECU.
  • an increased LPG fuel supply of 10 vol. % to 40 vol. % and in particular 15-25 vol. % in relation to the petrol fuel calculated by the ECU results in a desirable, stable operation of the combustion engine.
  • a control as such is exceptionally easy and can be constructed at a very low cost.
  • the high-pressure pump comprises a return line, more specifically a return line for the liquefied gas fuel.
  • the return line may be connected to the liquid fuel storage means.
  • the purge unit is connected to the return line.
  • the combustion engine comprises a high-pressure rail.
  • the high-pressure rail can be connected with the purge unit.
  • the high-pressure rail can be arranged downstream of the high-pressure pump.
  • the fuel under pressure, which is fed to the combustion chamber, can be fed through the connection to the purge unit where it can then be collected.
  • a feed portion of the purge unit is connected to the liquid fuel storage means.
  • the purge unit comprises a pressure accumulator.
  • a discharge side of the pressure accumulator can be connected with a suction side of the high-pressure pump, for example, via a control valve.
  • the accumulated fuel is fed from the pressure accumulator to the suction side of the high-pressure pump and in this manner purges the ‘old’ fuel, preferably LPG.
  • the pressure can be equalized accordingly, in such to a manner that this simplifies the purging action.
  • a supply portion of the pressure accumulator is connected to a discharge portion from the petrol storage.
  • the connection preferably comprises a pump, for example an electric pump. This enables petrol to be supplied to the accumulator for a longer period of time so that it can therefore be accumulated.
  • the invention also relates to a method for the alternate use of two types of injectable fuel.
  • the method according to the invention achieves at least one of these objectives of the invention by providing a first LPG fuel storage and a second liquid fuel storage, switching between the fuels by alternately feeding the fuels to a high-pressure pump, increasing the pressure of the supplied fuel, and the subsequent injection of the fuel into a combustion engine.
  • Switching from LPG fuel to the liquid fuel preferably comprises purging the fuel supplied to the high-pressure pump. Switching is enabled by purging the fuel supply line of a high-pressure pump (which is required for injecting the fuel). It is possible for the inlet or inlet portion of the pump to be purged.
  • the purging action according to the invention may comprise the equalization of the pressure of the supplied fuels. Equalizing the pressure simplifies the purging action, thus ensuring the relatively smooth switch-over from the one fuel to the other.
  • the purging action preferably comprises at least the temporary accumulation of the other fuel and the subsequent supply and injection of the accumulated fuel. This enables a single stroke of fuel to be collected and released in order to force the fuel present in the line out of the line and inlet portion of the high-pressure pump.
  • Purging comprises the supply of the liquid fuel under a high pressure, the high pressure being obtained by the stroke of a displacement means.
  • the stroke action is preferably performed by hydraulic means.
  • the fuel is used as a hydraulic medium. This results in a further saving in the arrangement of the purge unit. In addition, an arrangement as such provides greater reliability and safety.
  • switching from one fuel to the other according to the invention comprises the actuation of the other fuel pump, the generation of a preset pressure with the fuel pump, and the displacement of the one fuel after a predefined pressure level is reached.
  • the one fuel prevailing downstream of the line is displaced. This forces the switch-over to the other fuel.
  • the one fuel pump can continue pumping temporarily after the desired switching moment, in particular during the build-up phase of the purge unit.
  • the supply of fuel can be reduced by 10-40% vol. It is advantageous to allow the combustion engine to consume 20-30% vol. more liquefied gas than liquid fuel in similar conditions. This can be applied in a particularly simple adaptation of the ECU.
  • purging comprises the evacuation of the supplied fuel via the high-pressure pump. Evacuation ensures the equalization of the pressure. This enables switching to be performed smoothly.
  • the method preferably also comprises the return feed of liquefied gas from the high-pressure pump for direct injection back into the fuel storage means. This enables an excess amount of liquefied gas to be returned.
  • this further provides an arrangement for a combustion engine with direct injection, comprising at least one high pressure pump connectable with the internal combustion engine for the direct injection of fuel, wherein said arrangement comprises at least two fuel storages for a first fuel and a second fuel, for example liquefied gas and petrol respectively, as well as two fuel lines running from the storage means to an inlet of the high-pressure pump for supplying the fuels to said pump, said lines being provided with non-return valves, wherein a control valve is mounted across a non-return valve in the petrol fuel line.
  • FIG. 1 shows schematically a first embodiment of a system according to the invention
  • FIG. 2 shows schematically a second embodiment of a system according to the invention
  • FIG. 3 shows schematically a third embodiment of a system according to the invention.
  • FIG. 4 shows schematically a fourth embodiment of a system according to the invention.
  • FIG. 1 A first embodiment of a system according to the invention is described in FIG. 1 .
  • the system comprises a storage tank 21 for a liquefied vapour such as LPG. It should be understood, however, that any liquefied vapour can be used. Examples include pure propane and butane.
  • a pump 1 is mounted in the storage tank 21 . In this manner fuel is removed by suction from the tank and put under high pressure. The fuel in then pumped into the fuel supply line 22 through a safety shut-off valve 14 .
  • the pressure increase in relation to the storage tank lies within the range of between 0.5-10 bar and is more specifically approximately 4-6 bar.
  • a pressure sensor 15 is connected to the supply line 22 . This can be connected to an LPE (not shown).
  • the pressure sensor 15 can also be connected to a control unit 23 .
  • the control unit 23 is arranged for controlling the method of switching between two fuels.
  • the control unit 23 may be arranged to perform the usual LPE functions.
  • the control unit 23 can be connected to a controllable switch which can be operated by the driver of the vehicle in which the direct injection combustion engine is mounted, thus enabling the driver to indicate and control switching between the fuels.
  • a further safety shut-off valve 8 is mounted in fuel line 22 . This safety shut-off valve is closed at both ends.
  • a non-return valve 24 is positioned further downstream of the safety shut-off valve 8 . This prevents, at all times, that a fuel can reach line 22 via the non-return valve 24 .
  • the non-return valve 24 is a valve which can be shut off at both ends. This increases safety as it enables the prevention of leakage of gas from the return line.
  • Safety valves 14 and 8 are fully open when the system is in operation, i.e. when the arrangement operates in a mode wherein liquefied gas is used as a fuel, and is fully closed when not in operation.
  • a junction 25 is arranged downstream of the non-return valve, which is connected to a supply line 26 of the other fuel, in this case a petrol fuel storage means 27 .
  • Petrol fuel storage means 27 is fitted with a fuel pump 2 .
  • a branch is formed downstream of the fuel pump 2 towards a purge unit 28 according to the invention.
  • purge unit 28 comprises a control valve 4 connected to an inlet of an intensifier or pressure booster 3 .
  • the pressure intensifier 3 comprises a piston 12 with a large cross-section coupled along a plunger with a piston 11 having a smaller cross-section.
  • An outlet of the channel in which piston 11 is incorporated is connected to line 26 and to junction 25 via a non-return valve 7 .
  • the pistons 11 and 12 are located in the cylinder, wherein piston 11 is located in a constricted portion.
  • Fuel can fill the pressure booster via the inlet of the pressure booster 3 and via the compensation bore 13 .
  • the pistons 12 , 11 are in a position near to the left side of the pressure booster.
  • the interstitial space between pistons 12 , 11 can be ventilated to fuel storage means 27 .
  • a supply side of the pressure booster is further connected to a return line 29 via a shut-off valve 5 .
  • the interstitial space between pistons 12 , 11 is connected to the return line.
  • bypass 30 of the pressure booster 3 is also present.
  • This bypass 30 is the supply line of fuel from the storage means 27 in a normal operation mode.
  • a high-pressure fuel rail 31 is located in close proximity to the combustion engine (not shown).
  • a high-pressure pump 10 is incorporated in the supply line downstream of fuel line junction 25 and can bring the supplied fuel to a high pressure suitable for direct injection into the combustion engine via high-pressure rail 31 .
  • a four cylinder arrangement 50 is shown here.
  • the high-pressure rail 31 comprises four schematically represented injectors for injection into the four cylinders. The invention may apply to any number of cylinders.
  • a return line for liquefied gas 32 is connected to a high-pressure pump. This return line only acts as a return for the liquefied gas.
  • the bi-fuel system according to the invention can be built into an existing combustion engine and the section required for liquefied gas can be added to the existing section.
  • the combustion engine is controlled by an ECU, represented in FIG. 1 as the integrated control unit 23 .
  • the ECU is capable of controlling the supply of fuel, in this case fuel from storage means 27 , in accordance with measured parameters, as is customary in such combustion engines. The adjustment is such, that the return of the high-pressure pump 10 is not necessary for the fuel ‘normally’ used.
  • control unit 13 Depending on the required mode of operation, as is defined, for example, by exerting pressure on the acceleration pedal in the case of a car engine, a certain quantity of liquid fuel will need to be delivered through high-pressure rail 31 . This quantity is determined by control unit 13 . Depending on the required quantity, control unit 23 will control the delivery from pump 2 .
  • the ECU when the combustion engine is switched to the fuel from storage 1 , the ECU will be controlled by control unit 23 in such a manner that approximately 20-30% more fuel volume will be injected by the injectors. This increase in volume results in a stable and efficient behaviour of the combustion engine. Such an adaptation is particularly easy to implement in existing systems. The costs are reduced considerably.
  • the return flow through return line N is required, for example, to remove vapour bubbles from the supply line by pumping.
  • a restriction 9 is incorporated in the return line 32 .
  • the effective cross-section of this restriction 9 is variable and controlled by control unit C. It should be understood that in an alternative embodiment a restriction 9 can be used with a non-variable through-flow cross-sectional surface.
  • the return line 32 flows into tank 21 .
  • a return-valve 20 is arranged in the return line 32 , which can be controlled by control unit 23 . When switching over from liquefied vapour to petrol, this return line is closed off.
  • valves 4 , 5 , 8 , 14 and 20 are closed off and pump 1 is switched off. Additionally, non-return valves 6 and 7 become active.
  • the pressure booster 11 is in an idle state, preferably with a stroke to the left, as illustrated in FIG. 1 . No fuel flows through the purge unit.
  • the ECU or control unit 23 checks the supply of fuel in the usual manner, using available parameters.
  • the driver can switch to gas fuel.
  • a driver of a vehicle in which the system according to the invention is incorporated can operate a switch. This puts fuel change-over system into operation.
  • the control unit 23 will coordinate the switching operation.
  • the LPG pump 1 can be actuated.
  • valve 14 is opened.
  • the pressure sensor 15 will measure an increase in pressure in the fuel line 22 .
  • the ECU controls the supply of liquefied gas.
  • the ECU is adjusted to a 20-30% higher consumption of liquefied gas in relation to petrol.
  • valve 8 can be opened.
  • the pressure in the LPG supply line 22 is higher than the pressure in the petrol supply line.
  • the liquefied gas will therefore displace the petrol.
  • pump 2 can be switched off, thus completing the switching cycle.
  • the driver When switching takes place from gas to petrol, the driver will enter the relevant instruction and the control unit will record this and perform a number of steps of the procedure according to the invention.
  • One of the first steps will be the actuation of the petrol pump 2 .
  • valves 4 and 5 are opened. This results in a flow of petrol through a portion of the purge unit 28 .
  • valve 5 and 20 After a certain number of seconds, for example 2-6 seconds, valve 5 and 20 are closed, thus actuating the pressure booster 3 .
  • the pistons 11 , 12 will make a stroke to the right under the continual build-up of petrol on the left side.
  • valves 8 and 20 can be closed. This may be approximately 0.1-2.5 seconds later.
  • the LPG pump 1 can be switched off and valve 14 can be closed off.
  • the switch-over procedure is now completed.
  • the procedure is preferably applied in order to return the purge unit 28 , in particular the intensifier 3 , back into its initial starting position. This occurs by controlling the valves 4 and 5 respectively.
  • Valve 4 can be closed while valve 5 is opened. In this manner, the piston 11 , 12 is returned to the initial starting position.
  • An additional adjustment spring P forces the piston 11 , 12 back into the initial starting position.
  • the purge unit enables a displacement effect to be achieved with a single stroke of a piston 11 , 12 .
  • the conversion from existing systems to bi-fuel systems according to the invention can be performed at low costs.
  • FIG. 2 shows a second embodiment of a system for feeding two fuels to a combustion chamber, wherein a purge unit is applied in order to simplify switching between the fuels, in particular switching between a liquefied gas such as LPG to petrol, specifically in combination with a direct injection (DI) combustion engine.
  • a purge unit is applied in order to simplify switching between the fuels, in particular switching between a liquefied gas such as LPG to petrol, specifically in combination with a direct injection (DI) combustion engine.
  • DI direct injection
  • FIG. 2 comprises a DI combustion engine with four cylinders 50 into which fuel is injected through a high-pressure rail 31 , the injectors of which are not shown.
  • the high-pressure rail 31 is connected downstream to the high-pressure discharge of the high-pressure pump 10 .
  • the high-pressure pump 10 is connected via individual channels to the respective fuel storages 21 and 27 for liquefied gas, such as LPG, and a petrol fuel.
  • Non-return valves 40 , 41 , 42 are incorporated in the channels which prevent fuel from flowing back through the supply lines to the storage means 21 , 27 .
  • the supply lines may comprise a pump 1 , 2 for supplying the fuel from the storage means to the channels and, ultimately, to the high-pressure pump 10 .
  • FIG. 2 is a simplified representation of a system according to FIG. 1 . It should be noted that return lines and control means are incorporated in the embodiment shown, but are not shown in the drawing.
  • the purge unit is formed by pressure accumulator 44 , represented schematically as a sphere 45 incorporating a membrane 46 .
  • the membrane separates a gas side 47 , in which a predefined quantity of gas is formed, from a liquid side 48 .
  • the liquid side 48 can be emptied via a control valve 49 and is connected to the feed channel 52 for supplying petrol to the high-pressure pump 10 .
  • the petrol can be accumulated in the pressure accumulator 44 in a number of ways. This is indicated in FIG. 2 by dotted lines.
  • a first option may be the supply of petrol from the storage 27 via a schematically represented pump 60 .
  • This may be an electric pump, connected to a battery.
  • the capacity of the pump 60 may be small as there is often sufficient time after its use during switching to reload the accumulator, i.e. to fill it with fuel.
  • the petrol is collected at the liquid side 48 and can only be released via valve 49 .
  • Another option can be the connection of a supply line to the liquid side 48 of the pressure accumulator 44 by means of a T-piece mounted onto the high-pressure rail 31 .
  • a branch is formed through which the fuel prevailing under high pressure in the high-pressure rails 31 can be supplied to the liquid side 48 .
  • Control valves and shut-off valves known by those skilled in the art can be used to continually reload the pressure accumulator for each subsequent switching cycle. For example, it is possible to arrange a control means to allow supply to the pressure accumulator only when the pressure within the high-pressure rail 31 has reached a minimum pressure of, for example, 60 bar. This ensures that there is a build-up of sufficient pressure in the pressure accumulator to perform the desired purging effect during the switching cycle, thus displacing the liquefied gas.
  • overflow valve 64 which is mounted to the high-pressure rail 31 .
  • This valve 64 is present in order to protect the high-pressure rail 31 from overloading.
  • the valve 64 will open when a certain threshold pressure is reached. It is possible for the overflow valve to be connected to the accumulator.
  • the connection 65 may include suitable controllable shut-off valves and valves.
  • an LPG control unit 23 can be arranged in order to generate a temporary condition of high-pressure using the high-pressure pump 10 in the high-pressure rail 31 . This will result in the overflow valve 64 being opened so that petrol can reach the accumulator and be stored there until the switching cycle is set. This temporary increase in pressure can be of short duration. The volume of petrol required for purging is sufficiently small.
  • FIG. 3 shows yet another embodiment of an arrangement which is suitable for the use of and the switch-over between two fuels in which switching from LPG to petrol as a fuel is particularly improved.
  • Two fuel storages 21 , 27 are connected to the high-pressure pump 10 of a DI-combustion engine.
  • Those skilled in the art are capable of constructing suitable channels.
  • a blow-off valve 70 of the high-pressure pump 10 is coupled with a carbon canister 71 .
  • the blow-off valve 70 is represented schematically to the exterior of the high-pressure pump 10 .
  • the pressure/fuel can be quickly released through the blow-off valve 70 from the suction side 72 of the high-pressure pump 10 .
  • This functionality can be applied when switching over to petrol fuel.
  • petrol By venting the liquefied gas, petrol can be fed via the petrol pump 2 to the suction side of the high-pressure pump after which switching can take place.
  • a control unit (not shown) suitable for that purpose can be connected to pump 2 and valve 70 in order to perform this switch-over, thus enabling the switching operation to be correctly timed.
  • the blow-off of the LPG present in the line can be performed until the pressure on the suction side 72 is lower than the pressure required to return fuel with pump 2 .
  • a carbon canister 71 can be connected to the valve 70 in order to prevent LPG being released into the environment.
  • a channel 73 can be mounted from canister 71 which feeds LPG back into the engine through a schematically represented control valve 75 suitable for that purpose. The carbon canister can then be revitalized.
  • the purge unit comprises a purging action wherein the prevailing vapour is evacuated and then displaced by petrol.
  • the inlet portion or supply side of the high-pressure pump is purged.
  • FIG. 4 is a schematic representation of another embodiment.
  • a bypass in the form of a control valve 102 is mounted across a non-return valve 100 in a petrol supply line 101 , which is arranged so as to prevent the return of a fuel to the petrol storage tank 27 .
  • the pressure of the LPG at the suction side 103 of the high-pressure pump 10 is higher than the pressure that can be generated by the petrol pump 2 .
  • valve 20 When switching is performed, valve 20 is closed and valve 102 is opened. Opening the valve 102 whilst switching the fuels allows the LPG present at the suction side 103 to expand somewhat throughout, for example, a preferably large portion of the petrol supply line 101 .
  • the LPG will mix with the supplied fuel.
  • the inventor has discovered that the mixture of LPG with petrol in the petrol supply line has a vapour pressure that is manageable within the petrol fuel system, thus enabling the mixture to be supplied to the high-pressure pump 10 .
  • the opening operation of the valve 102 can be positively timed, preferably just before petrol begins to accumulate in front of non-return valve 100 .
  • bypass line 105 (which bypasses non-return valve 100 ), which is accessible to gas after switching has commenced and valve 102 has been opened, the vapour will disperse over a much greater portion of the fuel supply lines.
  • the bypass line 105 may additionally comprise a pump 104 for the purpose of supporting circulation.
  • the bypass 105 connects a point specifically upstream of valve 20 to a junction in the supply system specifically downstream of a non-return valve 106 .
  • the circulation 104 is arranged in order to cause an artificial circuit of fuel, in which the LPG present under high pressure mixes with the newly supplied fuel just before switching over to the new fuel. This mixing under the effects of the high-pressure pump 104 prevents the formation of LPG pockets which could otherwise have an adverse effect on the smooth running of the engine.
  • FIG. 4 relates specifically to another aspect. It should be noted that return lines, as well as the control unit are present in the embodiment shown, but not shown in the drawing.
  • FIG. 4 relates in particular to an invention wherein an arrangement for a combustion engine with direct injection is provided, the arrangement comprising at least one high pressure pump connected to the internal combustion engine for the direct injection of fuel, wherein said arrangement comprises at least two fuel storages for a first fuel and a second fuel, for example liquefied gas and petrol respectively, as well as two lines running from the storages to an inlet of the high-pressure pump for supplying the fuels to said pump, said lines being provided with non-return valves, wherein a control valve is mounted across a non-return valve in the petrol fuel line.
  • This controllable valve is arranged so that it enables the expansion of liquefied gas present at the suction side of the high-pressure pump in the petrol fuel line.
  • the controllable valve is connected to a control unit.
  • the control unit comprises an operable switch for the change-over of the fuel supply.
  • the control unit is arranged to open the control valve when switching from LPG to petrol.
US12/920,593 2008-03-03 2009-03-03 Arrangement and Method for an Internal Combustion Engine with Direct Dual Fuel Injection Abandoned US20110011369A1 (en)

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NL2001345A NL2001345C2 (nl) 2008-03-03 2008-03-03 Inrichting en werkwijze voor een verbrandingsmotor met directe inspuiting met twee brandstoffen.
NL2002384A NL2002384C2 (nl) 2008-03-03 2008-12-30 Inrichting en werkwijze voor een verbrandingsmotor met directe inspuiting met twee brandstoffen.
NL2002384 2008-12-30
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US20140202420A1 (en) 2014-07-24
RU2625886C2 (ru) 2017-07-19
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CN102007287A (zh) 2011-04-06
CA2717149C (en) 2017-04-04
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EP2260200B1 (en) 2015-06-17
PL2260200T3 (pl) 2015-11-30
CN102007287B (zh) 2014-12-31
RU2493417C2 (ru) 2013-09-20
JP5671348B2 (ja) 2015-02-18
RU2010140420A (ru) 2012-04-10
AU2009220299A1 (en) 2009-09-11
NL2002384A1 (nl) 2009-09-07
EP2260200A1 (en) 2010-12-15
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ES2544758T3 (es) 2015-09-03
US9494074B2 (en) 2016-11-15

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