EP3411583A1 - Verfahren zum betreiben eines kraftstoffversorgungssystems sowie kraftstoffversorgungssystem - Google Patents
Verfahren zum betreiben eines kraftstoffversorgungssystems sowie kraftstoffversorgungssystemInfo
- Publication number
- EP3411583A1 EP3411583A1 EP17700027.0A EP17700027A EP3411583A1 EP 3411583 A1 EP3411583 A1 EP 3411583A1 EP 17700027 A EP17700027 A EP 17700027A EP 3411583 A1 EP3411583 A1 EP 3411583A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- valve
- fuel
- storage line
- line
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- 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
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- 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
- F02D19/0605—Control of components of the fuel supply system to adjust the fuel pressure or temperature
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- 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
- F02D19/0673—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
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
-
- 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
- F02M21/0248—Injectors
- F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
-
- 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
- F02D19/0689—Injectors for in-cylinder direct injection
-
- 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
-
- 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 method for operating a fuel supply system having the features of the preamble of claim 1. Furthermore, the invention relates to a fuel supply system, which serves to supply an internal combustion engine with a gaseous and a liquid fuel. The fuel supply system is particularly suitable for carrying out the proposed method.
- the gaseous fuel is, in particular, natural gas (NG, ie "natural gas”)
- NG natural gas
- Natural gas is gaseous at normal temperatures, even under high pressure (CNG, ie "compressed natural gas”).
- CNG compressed natural gas
- Einblas- or injectors are required, which differ from those for the direct injection of gasoline or diesel fuel.
- LNG liquefied natural gas
- gaseous natural gas As liquefied natural gas (LNG) has a much lower volume than gaseous natural gas, it is usually stored in liquid form for mobile applications. For this purpose, the natural gas is cooled down to temperatures of about -160 ° C down.
- auxiliary or auxiliary medium for igniting.
- liquid diesel fuel can be used as an auxiliary medium since, unlike natural gas, it is self-igniting in the conditions usually given. In this case it is necessary to introduce two different types of fuel into the combustion chamber of the internal combustion engine.
- a so-called two-fluid injector For introducing two different types of fuel into the combustion chamber of an internal combustion engine, a so-called two-fluid injector can be used.
- the two fuels are fed separately to prevent mixing outside of the combustion chamber. Nevertheless, leakage can lead to mixing, which is dangerous or harmful in particular if gaseous fuel reaches the area of the liquid fuel.
- the gas pressure within the bi-fuel injector must be kept lower than the pressure of the liquid fuel.
- a method for controlling the injection pressure of a gaseous fuel which takes this principle into account when a single fuel injection valve is used for injecting the gaseous fuel and a liquid auxiliary fuel for igniting the gaseous fuel.
- the pressure for the gaseous fuel within the fuel injection valve is defined as the injection pressure.
- the supply of the gaseous fuel to a fuel rail supplying the fuel injection valve may be interrupted or slowed down by a valve in a fuel supply line until the gaseous fuel injection pressure falls to a predetermined value. In this way, the pressure of the gaseous fuel can be regulated to be lower than the pressure of the liquid fuel.
- the regulation of the injection pressure of the gaseous fuel is in response to the pressure of the auxiliary fuel.
- a valve can be used, which is designed as a pressure control valve and has a control chamber which is connected to a fuel rail for the auxiliary fuel. With this arrangement, the pressure for the gaseous fuel is controlled via the pressure for the auxiliary fuel.
- ability of the pressure in another storage line for the liquid fuel in such a way allows a pressure difference is maintained. This is to ensure that the pressure in the storage line for the gaseous fuel is always lower than the pressure in the other storage line for the liquid fuel.
- a fuel supply system is to be specified, which allows the implementation of the method.
- a method for operating a fuel supply system which serves to supply an internal combustion engine with a gaseous and a liquid fuel.
- the gaseous fuel is taken from a first storage line and injected directly into a combustion chamber of the internal combustion engine by means of an injection valve connected to the first storage line.
- the pressure in the first storage line is controlled via a pressure regulating device, which comprises at least one hydraulically controlled valve, as a function of a pressure in a further storage line for the liquid fuel.
- a pressure reduced in relation to the pressure in the further storage line is used as the control pressure for the hydraulic control of the valve.
- a throttle is used, which is arranged in a branch line connecting the valve to the further storage line.
- the pressure in the first gaseous fuel storage line is set in relation to the pressure in the other liquid fuel storage line.
- the throttle arranged in the branch line leading to the liquid fuel ensures that the pressure in the first storage line is lower than the pressure in the further storage line.
- the control pressure or the pressure difference between the Pressure in the first storage line and the pressure in the other storage line can be adjusted.
- the throttle is designed such that the control pressure or the pressure of the liquid fuel after the throttle is 150 to 500 bar to regulate the pressure of the gaseous fuel in the first storage line to a corresponding pressure.
- the pressure in the further storage line for the liquid fuel is preferably 200 to 600 bar and is still preferably 10 to 100 bar above the control pressure or the pressure in the first storage line for the gaseous fuel.
- the liquid fuel taken from the further storage line for the hydraulic control of the at least one hydraulically controlled valve is furthermore preferably fed to a return line.
- the amount of fuel used for the control of liquid fuel can thus be pressurized again and fed to the further storage line.
- the control pressure via an electrically controlled further valve of the pressure regulating device, which is arranged in the branch line downstream of the throttle and the at least one hydraulically controlled valve upright obtained and / or adapted.
- the further valve is preferably designed as a normally open valve, so that in case of failure, a pressure reduction can take place in the branch line. Furthermore, it is ensured that the pressure in the branch line is never higher than the pressure in the other liquid fuel storage line.
- the gaseous fuel is preferably held in a buffer which is connected via the at least one hydraulically controlled valve of the pressure control device to the first storage line and / or a return line for the gaseous fuel.
- the pressure regulating device may comprise a first hydraulically controlled valve, which connects the buffer to the first storage line for the gaseous fuel and is closed in the absence of control pressure.
- the closing of the valve can be effected by means of a spring, which loads a valve member of the valve in the closing direction.
- the pressure in the buffer is higher than the pressure selected in the first storage line for the gaseous fuel.
- the pressure in the buffer is 520 to 550 bar.
- the high pressure in the buffer supports the closing of the valve in the event of missing or falling control pressure.
- the flow through the valve in the direction of the first storage line for the gaseous fuel and thus the pressure in the first storage line can be regulated via the adjacent control pressure.
- the pressure control device may comprise a further hydraulically controlled valve, which connects the buffer with a line for returning the gaseous fuel and is open in the absence of control pressure.
- the opening of the valve can be effected by means of a spring which loads a valve member of the valve in the opening direction.
- the further hydraulically controlled valve thus enables a pressure reduction in the first storage line. Because the pressure in the return line is preferably less than 16 bar. Via the further hydraulically controlled valve, the pressure in the first storage line for the gaseous fuel can be regulated in such a way that it corresponds approximately to the applied control pressure.
- the pressure control device may also comprise only a single hydraulically controlled valve. This can be carried out, for example, as dombelastetes, pressure-reducing valve, which combines the previously described functions of both valves in itself.
- a single hydraulically controlled valve By using a single hydraulically controlled valve, a compact and space-saving arrangement can be achieved. In addition, the line and connection costs are reduced.
- a fuel supply system for supplying an internal combustion engine with a gaseous and a liquid fuel.
- This comprises a first storage line for the gaseous fuel and an injection valve connected to the first storage line for the direct injection of the gaseous fuel into a combustion chamber of the internal combustion engine.
- the system comprises a pressure regulating device for regulating the pressure in the first storage line as a function of a pressure in a further storage line for the liquid fuel, wherein the pressure regulating device minimizes at least one hydraulically controlled valve comprising a control chamber connected to the further storage line for the liquid fuel.
- the connection of the control chamber to the further storage line is established via a throttle arranged in a branch line.
- the throttle leads to a pressure reduction in the branch line, so that the control chamber of the at least one hydraulically controlled valve is subjected to a control pressure which is lower than the pressure in the further storage line for the liquid fuel.
- the control of the valve is thus carried out in relation to the pressure in the further storage line, wherein it is ensured via the throttle that the pressure in the first storage line for the gaseous fuel is always lower than the pressure in the further storage line for the liquid fuel. If the injection of the fuels into the combustion chamber of the internal combustion engine via a two-valve valve, it is thus ensured that no gaseous fuel penetrates by way of leakage in the region of the liquid fuel.
- the proposed fuel supply system is particularly suitable for carrying out the method according to the invention described above, since it has the system components required for this purpose.
- the advantages described above in connection with the method thus apply analogously to the fuel supply system according to the invention.
- the pressures prevailing in the fuel-carrying regions of the fuel supply system preferably the same values as previously stated in connection with the description of the method apply.
- the pressure regulating device of the fuel supply system comprises at least one further valve which is electrically controlled.
- the branch line in which the throttle is arranged, connectable to a return line.
- the returned via the return line control amount can thus be pressurized again and fed to the storage line for the liquid fuel.
- the electrically controlled further valve serves to maintain and / or adapt the control pressure in the branch line and thus in the control chamber of the hydraulically controlled valve. It is therefore located downstream of the throttle and the at least one hydraulically controlled valve.
- the electrically controlled is another valve designed as a normally open valve, so that in case of failure, a pressure reduction in the branch line is possible. This further ensures that the pressure in the branch line is never higher than the pressure in the liquid fuel storage line.
- the electrically controlled further valve may in particular be a pressure regulating valve.
- the fuel supply system comprises a buffer for the gaseous fuel, which is connectable via the at least one hydraulically controlled valve of the pressure control device with the first storage line and / or a return line for the gaseous fuel.
- the supply of gaseous fuel in the direction of the first storage line or the return via the return line can thus be regulated via the at least one hydraulically controlled valve in order to adapt the pressure in the first storage line to a predetermined value.
- the pressure in the buffer can be used as a back pressure against which the valve opens when the control pressure is applied.
- the pressure in the buffer is therefore preferably higher than the pressure selected in the first storage line and is preferably 520 to 550 bar.
- the pressure in the first storage line can be 150 to 500 bar, depending on the applied control pressure.
- the valve comprises a valve member which is acted upon in the closing direction by the spring force of a spring.
- the pressure control device of a fuel supply system may comprise two hydraulically controlled valves, in particular a pressure-reducing valve and a pressure-regulating valve, or a dombelastetes pressure-reducing valve. If two valves are provided, they are connected in series in such a way that a connection of the intermediate store to the first storage line for the gaseous fuel can be established via a first, preferably pressure-reducing, valve, so that the supply of gaseous fuel can be regulated.
- the second, preferably pressure-regulating, valve preferably serves to connect the intermediate store or the first storage line to a return line, so that an adjustment of the pressure in the first storage line for the gaseous fuel is possible.
- the valve is opened or the flow through the valve is increased, so that pressure is reduced. If only one valve is provided, which is preferably designed in this case as dombelastetes pressure-reducing valve, which combines the functions of the two valves described above, the pressure control device can be made compact, which has a favorable effect on the space requirement.
- Valves which are suitable for the design of the proposed pressure control device are known in principle from the prior art. It can thus be used on existing components, so that the concept can be implemented easily and inexpensively.
- the proposed for the method and the fuel supply system pressure control device provides a hydraulically controlled by the pressure of the liquid fuel pressure control of the gaseous fuel, which is ensured by hydraulic / mechanical means that the pressure of the ready for injection liquid fuel always higher than the pressure of the Injection is available gaseous fuel.
- the supply of the gaseous fuel in the direction of the storage line can be controlled by means of a hydraulically controlled pressure reducing valve and a pressure regulating valve or a single hydraulically controlled valve, which combines both functions in itself, used to control the valves of the hydraulic pressure of the liquid fuel downstream of a throttle which is disposed in a branch line connected to the liquid fuel storage line.
- the pressure of the gaseous fuel is regulated in relation to the pressure of the liquid fuel, while at the same time ensuring that the pressure of the gaseous fuel ready for injection is always lower than the pressure of the liquid fuel ready for injection.
- FIG. 2 shows a schematic longitudinal section through a hydraulically controlled valve of the pressure control device of the fuel supply system of FIG. 1,
- FIG. 3 shows a schematic longitudinal section through a further hydraulically controlled valve of the pressure control device of the fuel supply system of FIG. 1,
- FIG. 4 shows a schematic longitudinal section through a dome-loaded hydraulically controlled valve of a pressure regulating device of an alternative fuel supply system
- Fig. 5 is a schematic representation of a controller structure for a pressure control device of a fuel supply system according to the invention.
- Fig. 6 is a diagram illustrating the pressure waveforms over time.
- the fuel supply system shown in FIG. 1 comprises the supply of an internal combustion engine with a gaseous and a liquid fuel.
- the gaseous fuel in the present case is natural gas and the liquid fuel is diesel fuel.
- the supply of natural gas via the overhead circuit.
- the lower circuit is provided. Both types of fuel are therefore isolated from each other.
- the natural gas is kept in liquid form in a storage tank 15.
- a delivery unit 16 the still liquid natural gas is fed to an evaporator 17 and then fed as a gas to a buffer 11.
- the pressure in the buffer is 520 to 550 bar.
- the latch 11 is connectable to a storage line 1, via which the gaseous fuel injectors 2 is supplied, the injection of the gaseous fuel into a combustion chamber of an internal combustion engine serve.
- the pressure in the storage line 1 is 150 to 500 bar and is thus below the pressure prevailing in the buffer 11.
- auxiliary medium preferably the diesel fuel used, since the necessary switching forces are not directly by means of electrical energy, for example by an electromagnet, can be generated.
- the injection valve control is then carried out via a hydraulic control chamber, the pressure of which is variable via a solenoid valve as in known diesel common rail injectors.
- the auxiliary medium must be isolated from the natural gas in order to avoid damaging and dangerous natural gas entry into the diesel fuel. Small amounts of diesel fuel, which get into the natural gas, are blown into the combustion chamber and burned, are not disturbing.
- the leakage of diesel fuel into the natural gas at the guidance of the natural gas injection valve is avoided and natural gas in the diesel fuel is minimized by selecting the pressure of the natural gas to be slightly lower than the pressure of the diesel fuel. To achieve this, the pressure of the natural gas is regulated as a function of the pressure of the diesel fuel.
- the diesel fuel is stored in a storage tank 19 and fed by means of delivery units 20, 21 of a storage line 6.
- a fuel filter 22 is arranged between the delivery units 20, 21.
- the pressure in the storage line 6 can be controlled variably in the pressure range 160 to 600 bar via the delivery unit 22, which is adjustable in volume, and also be kept below a predetermined limit value in error cases via a pressure limiting valve 23.
- the Abêtmenge of the pressure relief valve 23 is guided via a return line 9 back into the storage tank 19.
- the diesel fuel can be used for operating the internal combustion engine or as auxiliary fuel for igniting the natural gas. In both cases, the diesel fuel must be injected into the combustion chamber of the internal combustion engine. This can be done via further injection valves 2 or by means of so-called Zweistoffinjektoren (not shown), by means of which two different types of fuel can be injected. Also in one Two-fluid injector, the two types of fuel must be isolated from each other. This takes place analogously to the hydraulically controlled natural gas injection valve 2.
- the fuel supply system of FIG. 1 has a pressure control device 3, which includes the valve 4 and another hydraulically controlled valve 5 in the natural gas cycle, a throttle 7 and an electrically controlled valve 10 in a branch line 8 of the cycle for the diesel fuel ,
- the valves 4, 5 each have a control chamber 13, 14 which can be acted upon by diesel fuel.
- the diesel fuel is taken from the branch line 8 downstream of the throttle 7. Since the throttle 7 acts as a pressure reducer, after the throttle 7 a pressure which is reduced relative to the pressure in the storage line 6 in the branch line 8 is established, which is used as control pressure for the hydraulic control of the valves 4, 5.
- the electrically controlled valve 10 which is also arranged in the branch line 8, the control pressure can be maintained and / or adjusted.
- the Abschmenge of the valve 10 is supplied to the return line 9.
- the control pressure applied in the control chambers 13, 14 of the valves 4, 5 is therefore predetermined by the design of the throttle 7 and the control current applied to the valve 10.
- the valves 4, 5 are designed such that in the absence of control pressure, the valve 4 closes and the valve 5 opens.
- the opened valve 5 allows in case of failure, a pressure reduction in the storage line 1, since it connects the storage line 1 with a return line 12, in which the pressure is below 16 bar.
- FIG. 2 shows an exemplary embodiment of a hydraulically controlled valve 4. It has an actuator 24, which limits the control chamber 13, so that the actuator 24 is applied a control pressure which corresponds to the pressure of the diesel fuel in the branch line 8 downstream of the throttle 7. This is 150 to 500 bar.
- a connected to the actuator 24 sealing ring 25 seals the control chamber 13 from a valve chamber 26, in which a spring 27 is received, via which the actuator 24 is biased in the closing direction of the valve 4.
- the sealing ring 25 seals the control chamber 13 from the valve space 26, through which the natural gas is passed.
- the actuator 24 is located on a valve member 29 of the valve 4, which is acted upon in the direction of a valve seat 28 by the spring force of a spring 30.
- the valve 4 In the absence of control pressure, the spring 30 and the pressure in the spring chamber 31, which correspond to the pressure in the buffer 11, speaks, the valve 4 is closed. Because the pressure in the buffer 11 (520 to 550 bar) is above the control pressure (150 to 500 bar). The pressure in the valve chamber 26 substantially corresponds to the control pressure.
- FIG. 3 shows an exemplary embodiment of a hydraulically controlled valve 5. It has an actuator 32, which limits the control chamber 14, so that the actuator 32, a control pressure is applied, which also corresponds to the pressure of the diesel fuel in the branch line 8 downstream of the throttle 7 (150 to 500 bar).
- the actuator 32 is applied to a valve member 33 of the valve 5, which is acted upon in the direction of a valve seat 34 by the spring force of a spring 35. In the absence of control pressure, the spring 35 and the pressure in the storage line 1 keep the valve 5 closed. Because the pressure in the storage line 1 (150 to 500 bar) is above the pressure in the return line 9 ( ⁇ 16 bar), via which the valve 5 is connected to the storage tank 15.
- the sealing between the gas-conducting region and the region leading the diesel fuel can take place, for example, via a sealing membrane 36 or a bellows 37.
- valves 4, 5 shown in FIGS. 2 and 3 it is also possible to provide a single valve which, as shown by way of example in FIG. 4, can be designed as a dome-loaded pressure-reducing valve and the functions of the valves 4, 5 in themselves united.
- the arrangement in the system can be carried out according to the graphic arranged on the left of FIG. 4. A detailed description of the valve of FIG. 4 will be omitted, since valves of this type are basically known.
- the sealing ring 25 only has to seal off natural gas between the valve chamber 26 and the return 12, where a slight leakage is harmless or harmless.
- a sealing membrane 36 is provided for the separation of the different fuels leading areas.
- FIG. 5 shows a regulator structure which leads to the pressure curves shown in FIG.
- p_set represents a predetermined pressure set point for the natural gas, which is to be achieved by a corresponding adjustment of the diesel pressure.
- the setpoint p_set is corrected dynamically (FIG. 5, box 37) to the setpoint p_setNG, which the gas pressure can also follow physically. From this and from the current gas pressure p_NG is calculated via a selectable distance p_offset via a maximum value selection of the setpoint value for the diesel pressure p_setD, which ensures that p_setD is also always dynamically greater than the natural gas pressure p_NG.
- the actual pressure is subtracted in each case and the control difference of a (preferably PID) control (39, 41) with pilot control (38, 40) is supplied, each of the control variable for the respective control valve (valve 10, contained in delivery unit 21 ).
- a (preferably PID) control 39, 41
- pilot control 38, 40
- the manipulated variable is the control pressure p_c, which is converted for the used pressure control valve via its p / l characteristic into an electrical control current I_PCVD.
- the manipulated variable is the flow rate of the diesel fuel pump (delivery unit 21).
- the pilot control unit 38 takes into account parameters dependent on the operation of the internal combustion engine, such as speed 42 and injection quantity 43.
- the delivery rate is converted into an electrical control current in accordance with the Q / 1 characteristic of the throttle valve (valve 10) used for quantity adjustment, for example l_PumpD implemented.
- Both control currents are usually represented by current-controlled PWM output stages of the control unit used.
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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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102016201511.7A DE102016201511A1 (de) | 2016-02-02 | 2016-02-02 | Verfahren zum Betreiben eines Kraftstoffversorgungssystems sowie Kraftstoffversorgungssystem |
PCT/EP2017/050030 WO2017133854A1 (de) | 2016-02-02 | 2017-01-02 | Verfahren zum betreiben eines kraftstoffversorgungssystems sowie kraftstoffversorgungssystem |
Publications (1)
Publication Number | Publication Date |
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EP3411583A1 true EP3411583A1 (de) | 2018-12-12 |
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EP17700027.0A Withdrawn EP3411583A1 (de) | 2016-02-02 | 2017-01-02 | Verfahren zum betreiben eines kraftstoffversorgungssystems sowie kraftstoffversorgungssystem |
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EP (1) | EP3411583A1 (de) |
CN (1) | CN108699992B (de) |
DE (1) | DE102016201511A1 (de) |
WO (1) | WO2017133854A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102018202807A1 (de) * | 2018-02-23 | 2019-08-29 | Robert Bosch Gmbh | Ventilanordnung zur Gasdruckregelung, Kraftstoffsystem mit Ventilanordnung zur Gasdruckregelung |
DE102018210899A1 (de) * | 2018-07-03 | 2020-01-09 | Robert Bosch Gmbh | Gasdruckregler zum Regeln eines Gasdrucks |
DE102019204150A1 (de) * | 2019-03-26 | 2020-10-01 | Robert Bosch Gmbh | Hochdruckspeicher für Kraftstoffe, Kraftstoffsystem |
CN111677609A (zh) * | 2020-06-09 | 2020-09-18 | 一汽解放汽车有限公司 | 一种双燃料***及车辆 |
CN114992020B (zh) * | 2022-05-10 | 2024-03-19 | 潍柴动力股份有限公司 | Hpdi发动机燃料轨压的确定方法、确定装置和车辆的控制器 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
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US6336598B1 (en) * | 1998-09-16 | 2002-01-08 | Westport Research Inc. | Gaseous and liquid fuel injector with a two way hydraulic fluid control valve |
US6298833B1 (en) * | 2000-04-07 | 2001-10-09 | Westport Research Inc. | Fluid seal apparatus and method for dynamically controlling sealing-fluid pressure |
WO2006122427A1 (en) | 2005-05-18 | 2006-11-23 | Westport Power Inc. | Direct injection gaseous-fuelled engine and method of controlling fuel injection pressure |
CA2532775C (en) * | 2006-01-31 | 2008-04-15 | Westport Research Inc. | Method and apparatus for delivering two fuels to a direct injection internal combustion engine |
NL2002383C2 (nl) * | 2008-12-30 | 2010-07-01 | Vialle Alternative Fuel Systems Bv | Brandstoftoevoersysteem en werkwijze voor het toevoeren van brandstof aan een verbrandingsruimte. |
CA2758246C (en) * | 2011-11-16 | 2013-02-12 | Westport Power Inc. | Method and apparatus for pumping fuel to a fuel injection system |
DE102011088797A1 (de) * | 2011-12-16 | 2013-06-20 | Robert Bosch Gmbh | Kraftstoffsystem |
CA2773651C (en) * | 2012-04-05 | 2013-04-09 | Westport Power Inc. | Method and apparatus for controlling fuel pressure in a gaseous fuelled internal combustion engine |
US9027534B2 (en) * | 2012-10-26 | 2015-05-12 | Caterpillar Inc. | Dual fuel engine and strategy to avoid atmospheric venting |
JP2014114792A (ja) * | 2012-12-12 | 2014-06-26 | Denso Corp | 内燃機関の燃料噴射制御装置及び車両の燃料噴射システム |
US9228507B2 (en) * | 2013-01-02 | 2016-01-05 | Caterpillar Inc. | Dual fuel common rail system and diesel only method of operating same |
US9181886B2 (en) * | 2013-05-08 | 2015-11-10 | Caterpillar Inc. | Dual fuel common rail transient pressure control and engine using same |
WO2014193236A1 (en) * | 2013-05-30 | 2014-12-04 | Indopar B.V. | A bi-fuel system and a method for operating such a system |
US9175651B2 (en) * | 2013-08-19 | 2015-11-03 | Caterpillar Inc. | Dual fuel system for internal combustion engine and leakage limiting seal strategy for same |
DE102013017853B4 (de) * | 2013-10-26 | 2021-03-04 | Woodward L'orange Gmbh | Verfahren zur Ausführung mit einem Dual-Fuel-Kraftstoffeinspritzsystem |
-
2016
- 2016-02-02 DE DE102016201511.7A patent/DE102016201511A1/de active Pending
-
2017
- 2017-01-02 WO PCT/EP2017/050030 patent/WO2017133854A1/de unknown
- 2017-01-02 EP EP17700027.0A patent/EP3411583A1/de not_active Withdrawn
- 2017-01-02 CN CN201780009495.6A patent/CN108699992B/zh active Active
Also Published As
Publication number | Publication date |
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WO2017133854A1 (de) | 2017-08-10 |
DE102016201511A1 (de) | 2017-08-03 |
CN108699992B (zh) | 2022-02-08 |
CN108699992A (zh) | 2018-10-23 |
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