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WO2018047021A1 - Dual fuel direct injection system for feeding internal combustion engines - Google Patents

Dual fuel direct injection system for feeding internal combustion engines Download PDF

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Publication number
WO2018047021A1
WO2018047021A1 PCT/IB2017/052763 IB2017052763W WO2018047021A1 WO 2018047021 A1 WO2018047021 A1 WO 2018047021A1 IB 2017052763 W IB2017052763 W IB 2017052763W WO 2018047021 A1 WO2018047021 A1 WO 2018047021A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
electrovalve
line
dual
chamber
Prior art date
Application number
PCT/IB2017/052763
Other languages
French (fr)
Inventor
Dariusz Bogdan NIEWINSKI
Mateusz Robert MIASTKOWSKI
Original Assignee
Lpgtech Sp. Z O. O.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lpgtech Sp. Z O. O. filed Critical Lpgtech Sp. Z O. O.
Publication of WO2018047021A1 publication Critical patent/WO2018047021A1/en

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Classifications

    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
    • 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
    • F02D19/0665—Tanks, e.g. multiple tanks
    • 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
    • F02D19/0673—Valves; Pressure or flow regulators; Mixers
    • F02D19/0678—Pressure or flow regulators therefor; Fuel metering valves therefor
    • 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
    • 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
    • F02D19/08—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 simultaneously using pluralities of fuels
    • F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0236—Multi-way valves; Multiple valves forming a multi-way valve system
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief valves
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank
    • 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
    • F02D19/0673—Valves; Pressure or flow regulators; Mixers
    • 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 a dual fuel direct injection system for feeding internal combustion engines, in particular engines powered with a primary liquid fuel and a liquefied gas fuel.
  • the system comprises a high pressure pump, a primary fuel tank with a pump, a liquefied gas tank with a pump, lines for supplying fuel from tanks to the high pressure pump, whereby the said system contains a device for cleaning a fuel line connected with a fuel intake of the high pressure pump.
  • 2143916 comprises a pump for a primary fuel, e.g. gasoline, and a second pump for feeding liquefied gas fuel.
  • a primary fuel e.g. gasoline
  • a second pump for feeding liquefied gas fuel.
  • an outlet of the first liquid fuel pump is connected to a line running between a liquefied gas tank and the second pump, whereas the second pump is connected through a high pressure pump with an injector unit.
  • This system has valves, whereby one of them is fitted in a bypass circuit of the second fuel pump while others are fitted at the outlet and at the inlet of the high pressure pump.
  • the system comprises a return line for redirecting excess liquefied gas fuel back to the liquefied gas tank.
  • the system is supervised by a control device which manages operation of the pumps, maintaining a required pressure while also redirecting excess fuel remains back from an injection manifold. It also flushes out the high pressure pump.
  • a dual fuel direct injection system for feeding internal combustion engines comprising fuel injectors with a fuel rail connected with a dual-chamber high pressure pump, a primary fuel tank with a pump, a liquefied gas tank, fuel lines connected with appropriate fuel tanks equipped with electrovalves, non-return and pressure valves, and a throttle and a pressure sensor, and also comprising electronic device for controlling the system connected with the electrovalves, with the pumps, and with the sensor, characterised in that it has a fuel exchange set fitted inside the liquefied gas tank, whereby this set comprises an additional chamber together with a low pressure pump mounted in a prechamber which is connected via an non-return valve with the liquefied gas tank, whereby the prechamber - via an ejector, and the additional chamber - via an non-return valve, are connected by fuel lines with an electrovalve unit.
  • the additional chamber is connected by a line via a non-return valve, via a second ejector and via an electrovalve with a primary liquid fuel line, and also connected - via the second ejector - by a line with the electrovalve unit.
  • the electrovalve unit comprises electrovalves connected with a controlling electrovalve equipped with a throttle at its bypass, whereas a line connecting the electrovalve with the low pressure chamber of the dual-chamber high pressure pump is equipped with a pressure sensor.
  • the additional chamber of the fuel exchange set is connected with the prechamber by an electrovalve and by a three-way pressure valve connected by a feeding line via an electrovalve with an outlet of a primary liquid fuel pump.
  • a favourable and unexpected effect of the invention is that such a system allows maximum and collision-free utilization of a typical primary liquid fuel system, as factory-installed by car manufacturers, for a dual fuel system of feeding internal combustion engines without emergency switching the system between operating on and being fed with a particular fuel such as e.g. gasoline or liquefied gas - LPG.
  • the invention relates to a dual fuel direct injection system for feeding internal combustion engines and is depicted on diagrams presenting examples of such a system, where fig. 1 presents diagram of the first option and fig. 2 presents an alternative option with an additional primary fuel line feeding the additional chamber of the fuel exchange set.
  • the system comprises a primary liquid fuel (e.g. gasoline) tank 1, inside which a primary liquid fuel pump 2 is fitted, whose outlet is connected by a feeding line 3 via an electrovalve 4, via a non-return valve 5, and via a three-way pressure valve 6 with an additional chamber 7 of a fuel exchange set 12, whereby in the additional chamber 7 a low pressure pump 8 is placed.
  • a primary liquid fuel e.g. gasoline
  • the feeding line 3 has a side branch equipped with a non-return pressure valve 34.
  • the three-way pressure valve 6 is connected with an electrovalve 9, whereby the additional chamber 7, together with the low pressure pump 8, with the three-way valve 6, and with the electrovalve 9, are placed in a prechamber 10, which is fitted in the fuel exchange set 12 placed inside a liquefied gas tank 11 - LPG.
  • the prechamber 10 has an ejector 13 placed inside it and connected by a line 14 with an electrovalve unit 15 and connected by a spigot 16 with the liquefied gas tank 11 e.g. LPG, and, further, the prechamber 10 is connected by a non-return valve 17 with the liquefied gas tank 11.
  • the additional chamber 7 is equipped with a one-way non-return valve 18 which is connected by a line 19 with the electrovalve unit 15.
  • the outlet of the low pressure pump 8 is connected by a line 20 with a low pressure chamber of a dual-chamber high pressure pump 21 which comprises two chambers - a low pressure chamber and a high pressure chamber.
  • the low pressure chamber of the dual-chamber high pressure pump 21 is connected by a line 22, which has a pressure sensor 23 fitted in, with the electrovalve unit 15 comprising: a controlling electrovalve 24 having a throttle 25 at its bypass, an electrovalve 26 mounted on the line 14, and an electrovalve 27 mounted on the line 19.
  • the high pressure chamber of the dual-chamber high pressure pump 21 is connected directly with a fuel rail 28 of fuel injectors 29.
  • the one-way non-return valve 18 is connected by a line with a second ejector 30 connected with the line 19 and a line 31 which in turn is connected via the electrovalve 4 with the feeding line 3 connecting the outlet of the liquid fuel pump 2, via the non-return valve 5 and via an electrovalve 32, with the outlet of the electrovalve 9 placed in an additional chamber 7.
  • the electrovalve 9 fitted in the prechamber 10 has its inlet directed into the additional chamber 7 and, at the same time, is connected by a line 33, via the non-return valve 5, via the electrovalve 32, and next via the feeding line 3, with the outlet of the primary liquid fuel pump 2 mounted in the primary liquid fuel tank 1.
  • the feeding line 3 is equipped with the non-return pressure valve 34 fitted inside the tank 1.
  • control unit 35 the operation of the system is controlled by a control unit 35 through connections (which are not indicated on the drawings in order to preserve clarity of the diagram) with: the primary liquid fuel pump 2, the low pressure pump 8, and with the electrovalves 4, 9, 24, 26, 27, and 32, on the basis of the data from the pressure sensor 23.
  • the primary liquid fuel - gasoline - is being fed by the primary liquid fuel pump 2 via the feeding line 3, with the electrovalve 4 open, into the fuel exchange set 12 fitted in the liquefied gas tank 11 where, via the open three-way pressure valve 6, gasoline flows into the additional chamber 7 and next, via the low pressure pump 8, flows into the dual-chamber high pressure pump 21, and next, via the rail 28, to the fuel injectors 29.
  • the electrovalves 24, 26, and 27 are closed, and the low pressure pump 8 is not operating, and the non-return valve 5 prevents gas fuel from entering into the primary liquid fuel tank 1 when the gas pressure is higher than the pressure of the primary liquid fuel - gasoline.
  • liquefied gas fuel LPG
  • gas is being pumped by the low pressure pump 8 fitted inside the liquefied gas tank 11 via the line 20 directly into the dual chamber high pressure pump 21, and next, via the rail 28, to the fuel injectors 29.
  • liquefied gas is directed, via the line 22, into the electro valve unit 15, and next, via the open electrovalve 26, flows through the line 14 into the prechamber 10 via the ejector 13 which ensures that the prechamber 10 is filled with gas regardless of its current volume in the liquefied gas tank 11.
  • the electrovalve 24 While the engine is operating on liquefied gas fuel the electrovalve 24 is open in order to ensure the flow required by the operation of the ejector 13. An additional way to fill the prechamber 10 is provided by the non-return valve 17 which ensures that the level of liquefied gas fuel is identical (and not lower than) the fuel level in the whole liquefied gas tank 11.
  • the electrovalve 9 which opens the way into the additional chamber 7, the chamber is filled with liquefied gas thanks to the principle of communicating vessels.
  • the primary liquid fuel pump 2 is switched off.
  • the control electrovalve 24 switches off and, instead, the throttle 25 at the bypass of the control electrovalve 24 is being used.
  • a shift from feeding the engine by the primary liquid fuel - gasoline - to liquefied gas fuel - LPG - proceeds in two stages.
  • the electrovalve 4 which stops the inflow of gasoline, is force-closed while the electrovalve 9 for LPG gas inflow and the electrovalve 27 is opened.
  • the engine is being fed by a mixture of gasoline and LPG. Since the electrovalve 26 is closed, there is no possibility that both the fuels get mixed in the tanks 1 and 11.
  • the second stage commences, where the electrovalve 27 closes and the electrovalve 26 opens.
  • a shift from feeding the engine with liquefied gas fuel - LPG - to the primary liquid fuel - gasoline - proceeds in a similar way as in the case of the shift from gasoline to LPG.
  • the primary liquid fuel pump 2 is switched on, while the low pressure pump 8 is switched off, and the electrovalves 26 and 9 are closed while the electrovalve 27 opens.
  • the electrovalve 27 is closed. From this moment on the engine operates by being fed with the primary liquid fuel - gasoline, including switching off and also starting the cold/warmed-up engine.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A dual fuel direct injection system for feeding internal combustion engines comprising fuel pumps, fuel tanks, fuel lines, electrovalves and non-return valves, and also a fuel rail with fuel injectors and electronic unit controlling the system, characterised in that inside a liquefied gas tank (1 1) it has a fuel exchange set (12) fitted, consisting of an additional chamber (7) with a low pressure pump (8) fitted together in a prechamber (10) connected by a non-return valve (17) with the liquefied gas tank (11), whereby the prechamber (10), via an ejector (13) and via a line (14), and the additional chamber, via a non-return valve and via a line (19), are both connected with an electro valve unit (15) comprising a controlling valve (24) with a throttle (25) at its bypass and electrovalves (26) and (27).

Description

Dual fuel direct injection system for feeding internal combustion engines
The invention relates to a dual fuel direct injection system for feeding internal combustion engines, in particular engines powered with a primary liquid fuel and a liquefied gas fuel.
From European patent No EP 2260200 there is a known dual fuel direct injection system for feeding internal combustion engines. The system comprises a high pressure pump, a primary fuel tank with a pump, a liquefied gas tank with a pump, lines for supplying fuel from tanks to the high pressure pump, whereby the said system contains a device for cleaning a fuel line connected with a fuel intake of the high pressure pump.
From Polish patent application No P.408041 there is also a known multi-fuel system for feeding internal combustion engines which comprises a gas installation, at least one fuel installation, and a fuel mixer, characterised in that it contains a fuel circulation pump, a jet pump, and a fuel level sensor built into the mixer housing and there are also additional pumps fitted into the fuel installation. Overall the system comprises five pumps, whereby a high pressure pump has an outgoing overflow system equipped with valves, including one non-return valve.
Another dual fuel injection system known from patent description EP
2143916 comprises a pump for a primary fuel, e.g. gasoline, and a second pump for feeding liquefied gas fuel. In this system an outlet of the first liquid fuel pump is connected to a line running between a liquefied gas tank and the second pump, whereas the second pump is connected through a high pressure pump with an injector unit. This system has valves, whereby one of them is fitted in a bypass circuit of the second fuel pump while others are fitted at the outlet and at the inlet of the high pressure pump. Moreover, the system comprises a return line for redirecting excess liquefied gas fuel back to the liquefied gas tank. The system is supervised by a control device which manages operation of the pumps, maintaining a required pressure while also redirecting excess fuel remains back from an injection manifold. It also flushes out the high pressure pump.
A dual fuel direct injection system for feeding internal combustion engines comprising fuel injectors with a fuel rail connected with a dual-chamber high pressure pump, a primary fuel tank with a pump, a liquefied gas tank, fuel lines connected with appropriate fuel tanks equipped with electrovalves, non-return and pressure valves, and a throttle and a pressure sensor, and also comprising electronic device for controlling the system connected with the electrovalves, with the pumps, and with the sensor, characterised in that it has a fuel exchange set fitted inside the liquefied gas tank, whereby this set comprises an additional chamber together with a low pressure pump mounted in a prechamber which is connected via an non-return valve with the liquefied gas tank, whereby the prechamber - via an ejector, and the additional chamber - via an non-return valve, are connected by fuel lines with an electrovalve unit. Alternatively, the additional chamber is connected by a line via a non-return valve, via a second ejector and via an electrovalve with a primary liquid fuel line, and also connected - via the second ejector - by a line with the electrovalve unit. The electrovalve unit comprises electrovalves connected with a controlling electrovalve equipped with a throttle at its bypass, whereas a line connecting the electrovalve with the low pressure chamber of the dual-chamber high pressure pump is equipped with a pressure sensor. The additional chamber of the fuel exchange set is connected with the prechamber by an electrovalve and by a three-way pressure valve connected by a feeding line via an electrovalve with an outlet of a primary liquid fuel pump.
A favourable and unexpected effect of the invention is that such a system allows maximum and collision-free utilization of a typical primary liquid fuel system, as factory-installed by car manufacturers, for a dual fuel system of feeding internal combustion engines without emergency switching the system between operating on and being fed with a particular fuel such as e.g. gasoline or liquefied gas - LPG.
The invention relates to a dual fuel direct injection system for feeding internal combustion engines and is depicted on diagrams presenting examples of such a system, where fig. 1 presents diagram of the first option and fig. 2 presents an alternative option with an additional primary fuel line feeding the additional chamber of the fuel exchange set.
In the first option the system comprises a primary liquid fuel (e.g. gasoline) tank 1, inside which a primary liquid fuel pump 2 is fitted, whose outlet is connected by a feeding line 3 via an electrovalve 4, via a non-return valve 5, and via a three-way pressure valve 6 with an additional chamber 7 of a fuel exchange set 12, whereby in the additional chamber 7 a low pressure pump 8 is placed. Inside the primary liquid fuel tank 1 the feeding line 3 has a side branch equipped with a non-return pressure valve 34. The three-way pressure valve 6 is connected with an electrovalve 9, whereby the additional chamber 7, together with the low pressure pump 8, with the three-way valve 6, and with the electrovalve 9, are placed in a prechamber 10, which is fitted in the fuel exchange set 12 placed inside a liquefied gas tank 11 - LPG.
In the fuel exchange set 12 the prechamber 10 has an ejector 13 placed inside it and connected by a line 14 with an electrovalve unit 15 and connected by a spigot 16 with the liquefied gas tank 11 e.g. LPG, and, further, the prechamber 10 is connected by a non-return valve 17 with the liquefied gas tank 11. The additional chamber 7 is equipped with a one-way non-return valve 18 which is connected by a line 19 with the electrovalve unit 15. The outlet of the low pressure pump 8 is connected by a line 20 with a low pressure chamber of a dual-chamber high pressure pump 21 which comprises two chambers - a low pressure chamber and a high pressure chamber. The low pressure chamber of the dual-chamber high pressure pump 21 is connected by a line 22, which has a pressure sensor 23 fitted in, with the electrovalve unit 15 comprising: a controlling electrovalve 24 having a throttle 25 at its bypass, an electrovalve 26 mounted on the line 14, and an electrovalve 27 mounted on the line 19. The high pressure chamber of the dual-chamber high pressure pump 21 is connected directly with a fuel rail 28 of fuel injectors 29.
In the second option of the system the one-way non-return valve 18 is connected by a line with a second ejector 30 connected with the line 19 and a line 31 which in turn is connected via the electrovalve 4 with the feeding line 3 connecting the outlet of the liquid fuel pump 2, via the non-return valve 5 and via an electrovalve 32, with the outlet of the electrovalve 9 placed in an additional chamber 7. The electrovalve 9 fitted in the prechamber 10 has its inlet directed into the additional chamber 7 and, at the same time, is connected by a line 33, via the non-return valve 5, via the electrovalve 32, and next via the feeding line 3, with the outlet of the primary liquid fuel pump 2 mounted in the primary liquid fuel tank 1. The feeding line 3 is equipped with the non-return pressure valve 34 fitted inside the tank 1.
According to the invention the operation of the system is controlled by a control unit 35 through connections (which are not indicated on the drawings in order to preserve clarity of the diagram) with: the primary liquid fuel pump 2, the low pressure pump 8, and with the electrovalves 4, 9, 24, 26, 27, and 32, on the basis of the data from the pressure sensor 23.
During operation of an internal combustion engine in a primary fuel mode, the primary liquid fuel - gasoline - is being fed by the primary liquid fuel pump 2 via the feeding line 3, with the electrovalve 4 open, into the fuel exchange set 12 fitted in the liquefied gas tank 11 where, via the open three-way pressure valve 6, gasoline flows into the additional chamber 7 and next, via the low pressure pump 8, flows into the dual-chamber high pressure pump 21, and next, via the rail 28, to the fuel injectors 29. At the same time the electrovalves 24, 26, and 27 are closed, and the low pressure pump 8 is not operating, and the non-return valve 5 prevents gas fuel from entering into the primary liquid fuel tank 1 when the gas pressure is higher than the pressure of the primary liquid fuel - gasoline. When the system is operating in liquefied gas fuel (LPG) mode, gas is being pumped by the low pressure pump 8 fitted inside the liquefied gas tank 11 via the line 20 directly into the dual chamber high pressure pump 21, and next, via the rail 28, to the fuel injectors 29. In order to prevent gas from decompression in the dual-chamber high pressure pump 21 liquefied gas is directed, via the line 22, into the electro valve unit 15, and next, via the open electrovalve 26, flows through the line 14 into the prechamber 10 via the ejector 13 which ensures that the prechamber 10 is filled with gas regardless of its current volume in the liquefied gas tank 11. While the engine is operating on liquefied gas fuel the electrovalve 24 is open in order to ensure the flow required by the operation of the ejector 13. An additional way to fill the prechamber 10 is provided by the non-return valve 17 which ensures that the level of liquefied gas fuel is identical (and not lower than) the fuel level in the whole liquefied gas tank 11. By means of the electrovalve 9, which opens the way into the additional chamber 7, the chamber is filled with liquefied gas thanks to the principle of communicating vessels. When the engine is operating in liquefied gas mode the primary liquid fuel pump 2 is switched off. In case when there is a need to increase the pressure of liquefied gas fuel the control electrovalve 24 switches off and, instead, the throttle 25 at the bypass of the control electrovalve 24 is being used.
A shift from feeding the engine by the primary liquid fuel - gasoline - to liquefied gas fuel - LPG - proceeds in two stages. In the first stage the electrovalve 4, which stops the inflow of gasoline, is force-closed while the electrovalve 9 for LPG gas inflow and the electrovalve 27 is opened. This allows LPG gas to transfer into the dual-chamber high pressure pump 21. During this stage the engine is being fed by a mixture of gasoline and LPG. Since the electrovalve 26 is closed, there is no possibility that both the fuels get mixed in the tanks 1 and 11. After this stage is completed the second stage commences, where the electrovalve 27 closes and the electrovalve 26 opens. From this moment on the engine is being fed with LPG under all states of its operation, including switching off and also starting the cold/warmed- up engine, in which case the control electrovalve 24, which increases the flow, is closed in order to generate a higher pressure in the dual-chamber high pressure pump 21, at the same time preventing gas from decompression.
A shift from feeding the engine with liquefied gas fuel - LPG - to the primary liquid fuel - gasoline - proceeds in a similar way as in the case of the shift from gasoline to LPG. In the first stage the primary liquid fuel pump 2 is switched on, while the low pressure pump 8 is switched off, and the electrovalves 26 and 9 are closed while the electrovalve 27 opens. After a specified time determined by the electronic control unit 35 the electrovalve 27 is closed. From this moment on the engine operates by being fed with the primary liquid fuel - gasoline, including switching off and also starting the cold/warmed-up engine.

Claims

Patent claims
1. A dual fuel direct injection system for feeding internal combustion engines comprising fuel injectors with a fuel rail connected with a dual-chamber high pressure pump, a primary liquid fuel tank and a liquefied gas tank, fuel lines from respective fuel tanks equipped with electrovalves, non-return valves and pressure valves, and an ejector and a pressure sensor, and also comprising electronic control unit for controlling the operation of the system connected with the electrovalves, with pumps, and with the pressure sensor, characterised in that it has a fuel exchange set (12) fitted inside the liquefied gas tank (1 1) and comprising an additional chamber (7) with a low pressure pump (8), which together are fitted in a prechamber (10) connected with the liquefied gas tank (11) via a non-return valve (17), whereby the prechamber (10), via the ejector (13) and via a line (14), and the additional chamber (7), via a non-return valve (18) and a line (19), are connected with a electrovalve unit (15).
2. The dual fuel direct injection system in accordance with claim 1, characterised in that, alternatively, the additional chamber (7) is connected by a line (31), via the non-return valve (18), via a second ejector (30), and via an electrovalve (4) with a feeding line (3), and also, by the line (19) via the second ejector (30) with the electrovalve unit (15).
3. The dual fuel direct injection system in accordance with claim 1, characterised in that the electrovalve unit (15) comprises electrovalves (26) and (27) connected with a controlling electrovalve (24) equipped at its bypass with a throttle (25), whereas a line (22) connecting the valve unit (15) with a low pressure chamber of the dual-chamber high pressure pump (21) is equipped with a pressure sensor (23).
4. The dual fuel direct injection system in accordance with claim 1, characterised in that the additional chamber (7) of the fuel exchange set (12) is connected with the prechamber (10) through an electrovalve (9) and through a three-way pressure valve (6), which is connected by the feeding line (3), via an electrovalve (4), with the outlet of the primary liquid fuel pump (2).
Patent claims
1. A dual fuel direct injection system for feeding internal combustion engines comprising fuel injectors with a fuel rail connected with a dual-chamber high pressure pump, a primary liquid fuel tank and a liquefied gas tank, fuel lines from respective fuel tanks equipped with electrovalves, non-return valves and pressure valves, and an injector and a pressure sensor, and also comprising electronic control unit for controlling the operation of the system connected with the electrovalves, with pumps, and with the pressure sensor, characterised in that it has a fuel exchange set (12) fitted inside the liquefied gas tank (11) and comprising an additional chamber (7) with a low pressure pump (8), which together are fitted in a prechamber (10) connected with the liquefied gas tank (11) via a non-return valve (17), whereby the prechamber (10), via the injector (13) and via a line (14), and the additional chamber (7), via a non-return valve (18) and a line (19), are connected with a electrovalve unit (15).
2. The dual fuel direct injection system in accordance with claim 1, characterised in that, alternatively,, the additional chamber (7) is connected by a line (31), via the non-retum valve (18), via an additional injector (30), and via an electrovalve (4) with a feeding line (3), and also, by the line (19) via the additional injector (30) with the electrovalve unit (15).
3. The dual fuel direct injection system in accordance with claim 1, characterised in that the electrovalve unit (15) comprises electrovalves (26) and (27) connected with a controlling electrovalve (24) equipped at its bypass with a throttle (25), whereas a line (22) connecting valve unit (15) with a low pressure chamber of the dual-chamber high pressure pump (21) is equipped with a pressure sensor (23).
4. The dual fuel direct injection system in accordance with claim 1, characterised in that the additional chamber (7) of the fuel exchange set (12) is connected with the prechamber (10) through an electrovalve (9) and through a three-way pressure valve (6), which is connected by the feeding line (3), via an electrovalve (4), with the outlet of the primary liquid fuel pump (2).
PCT/IB2017/052763 2016-09-08 2017-05-11 Dual fuel direct injection system for feeding internal combustion engines WO2018047021A1 (en)

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PLP.418610 2016-09-08
PL418610A PL229707B1 (en) 2016-09-08 2016-09-08 Bifuel direct injection feeding system of combustion engines

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Cited By (2)

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EP3578784A1 (en) * 2018-06-05 2019-12-11 Certools Spólka Jawna Piotr Czekalski Krzysztof Hanke Petrol/diesel and lpg fuel supply system for internal combustion engines
CN112377336A (en) * 2020-11-09 2021-02-19 一汽解放汽车有限公司 Fuel supply system and method for high-pressure direct injection dual-fuel engine

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EP2143916A1 (en) * 2008-07-07 2010-01-13 Teleflex GFI Europe B.V. Dual fuel injection system and motor vehicle comprising such injection system
WO2015130182A1 (en) * 2014-02-28 2015-09-03 Certools Spółka Jawna Piotr Krzysztof Hanke Fuel supply system for internal combustion engines
US20150285164A1 (en) * 2011-12-16 2015-10-08 Robert Bosch Gmbh Fuel System for an Internal Combustion Engine which can be Operated with at least Two Fuel Types
PL408041A1 (en) * 2014-04-28 2015-11-09 Landi Renzo Polska Spółka Z Ograniczoną Odpowiedzialnością System of multi-fuel feeding of combustion engines

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Publication number Priority date Publication date Assignee Title
EP2143916A1 (en) * 2008-07-07 2010-01-13 Teleflex GFI Europe B.V. Dual fuel injection system and motor vehicle comprising such injection system
US20150285164A1 (en) * 2011-12-16 2015-10-08 Robert Bosch Gmbh Fuel System for an Internal Combustion Engine which can be Operated with at least Two Fuel Types
WO2015130182A1 (en) * 2014-02-28 2015-09-03 Certools Spółka Jawna Piotr Krzysztof Hanke Fuel supply system for internal combustion engines
PL408041A1 (en) * 2014-04-28 2015-11-09 Landi Renzo Polska Spółka Z Ograniczoną Odpowiedzialnością System of multi-fuel feeding of combustion engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3578784A1 (en) * 2018-06-05 2019-12-11 Certools Spólka Jawna Piotr Czekalski Krzysztof Hanke Petrol/diesel and lpg fuel supply system for internal combustion engines
CN112377336A (en) * 2020-11-09 2021-02-19 一汽解放汽车有限公司 Fuel supply system and method for high-pressure direct injection dual-fuel engine

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PL229707B1 (en) 2018-08-31

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