CN104047739B - System and method for closing fuel tank valve - Google Patents

System and method for closing fuel tank valve Download PDF

Info

Publication number
CN104047739B
CN104047739B CN201410098727.8A CN201410098727A CN104047739B CN 104047739 B CN104047739 B CN 104047739B CN 201410098727 A CN201410098727 A CN 201410098727A CN 104047739 B CN104047739 B CN 104047739B
Authority
CN
China
Prior art keywords
fuel
pressure
gas
fuel tank
gaseous
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.)
Active
Application number
CN201410098727.8A
Other languages
Chinese (zh)
Other versions
CN104047739A (en
Inventor
R·D·皮尔西弗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
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
Priority claimed from US13/841,935 external-priority patent/US9422900B2/en
Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Publication of CN104047739A publication Critical patent/CN104047739A/en
Application granted granted Critical
Publication of CN104047739B publication Critical patent/CN104047739B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F02D19/0623—Failure diagnosis or prevention; Safety measures; Testing
    • 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]
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The present invention describes a kind of method, is used to close storage fuel tank valve in response to the leakage in fuel conduit or fuel rail, and the fuel tank of vehicle is emptied when leakage is not detected.This method includes, fuel tank pressure is compared with fuel conduit or fuel rail pressure, it to detect leakage therein, and further comprise storing the gas pressure of fuel tank using the measurement of dedicated fuel tank pressure sensor, and thus measure remaining fuel quantity.In response to the leakage in fuel system, controller closes the solenoid valve of enhancing mechanical flow limitation valve, to prevent fuel stream and prevent the waste of fuel for storing fuel tank from gas.

Description

System and method for closing fuel tank valve
Cross reference to related applications
The application is the part continuation application for the U.S. Patent Application No. 13/431,295 submitted on March 27th, 2012, is All purposes, entire internal to be incorporated into this text for reference.
Technical field
When the present invention relates to for detecting leakage in fuel system close vehicle storage fuel tank valve system with Method.The fuel stream that the system and method carry out the fuel tank of self-pressurization to limitation is particularly useful.
Background technique
Vehicle may include the fuel tank for accommodating the pressurization of some other gaseous matters used when fuel or vehicle operation. For example, the operating fuel that some vehicles are supplied by using the fuel tank for carrying out self-pressurization, wherein can be by a greater amount of fuel It is stored under the pressure in fuel tank and stores fuel.In the downstream of fuel tank, pressure regulator and valve are generally included, to add The gas of pressure, which is reduced to, is more suitable for pressure, for being introduced into engine, and can be via including manifold (such as fuel rail) Conveyance conduit the gas of pressurization is introduced into engine.
Because the gas content of storage fuel tank is stored under stress, violation system to atmospheric pressure will lead to generation From storage fuel tank to the pressure difference of the net flow of the gaseous fuel of leakage region.For this reason, vehicle generally includes to make to send out The leakage recognition mode that motivation can be continued to run when fuel system is by significant system leak.US6314948 is shown One example, US6314948 describe detection air guide rail pressure to determine the air pressure for being delivered to fuel and air guide rail The method whether having occurred and that significantly is lowered in the loss of power.
Summary of the invention
Inventor has realized that the shortcomings that this kind of method herein, and has developed a kind of for firing in response to gas Potential leakage in material system and the method for closing fuel tank valve.By by fuel tank pressure and fuel rail pressure and cartridge One or more in the pressure of road are compared, and the leakage in detection gas fuel system is possible, institute as follows The mode of stating allows accurately identifying for the degeneration of the fuel system from injector to fuel tank, while even if still can increase under low pressure Gaseous fuel in fuel tank uses.So, this method includes being led based on excessively high gas fuel tank pressure and insufficient gas Rail pressure power and override gaseous fuel are supplied, and in response to when one or more in fuel rail pressure or fuel line pressure A be down under lower threshold and fuel tank pressure detect leakage and close storage fuel tank valve when being higher than upper limit threshold.
In a particular example, for example, based on the pressure difference between the high pressure sensor in fuel tank and fuel conduit More than threshold value, this method further includes closing fuel tank valve, and switch fuels sources.For example, when leakage appears in gaseous fuel system When in system, the vehicle run with gas and liquid fuel can be from only with the operation transformation of gaseous fuel only with the fortune of liquid fuel Row.If engine remains in operation while from storage fuel tank conveying gaseous fuel, engine diluter may be transported than desired Row, because flow rate of the fuel from fuel tank to engine may be insufficient.
The present invention can provide multiple advantages.Specifically, this method can be applied to different types of fuel injection system And gas with various.In addition, the present invention provides the operational mode of the fuel quantity based on storage, to reduce the loss of fuel.Cause This, this method can reduce the gaseous fuel quantity that can be discharged into atmosphere if occurring leaking in gas fuel system.Separately Outside, when leakage is not detected, engine system works according to design, and the system is also allowed for: when gas fires When the pressure of material is greater than threshold tank pressure, gaseous fuel only is supplied to engine；And when the pressure of gaseous fuel is less than When threshold tank pressure, gaseous fuel and liquid fuel are supplied.It is logical when the pressure of fuel tank is less than threshold tank pressure It crosses and supplies liquid fuel to engine and when gaseous fuel, extract additional gas out from storage fuel tank and mentioned simultaneously for engine It is possible for liquid fuel, so that engine will not misfire or richer operate than desired.By this method, gaseous fuel Case can empty gas-pressurized, while engine is provided in a manner of extending the range of runing time or vehicle and engine and can be connect The performance received, because gas fuel tank can be evacuated more thoroughly.
When taken alone or in connection with the accompanying drawings, above-mentioned advantage of the invention and further advantage and Feature will be apparent.It should be appreciated that providing outlined above to introduce in simplified form in a specific embodiment The some concepts further described.This is not meant to the key or essential characteristic that distinguish claimed theme, it is desirable that protection Theme range by being uniquely determined with the claim being attached to after specific embodiment.In addition, claimed theme is not The embodiment of any disadvantage for being limited to solve above or being referred in any part of the disclosure.
Detailed description of the invention
When individually or about attached drawing referring to specific embodiment, passes through to read and be referred to herein as specific embodiment Embodiment example, it will be more fully understood by advantage described herein, in which:
Fig. 1 is the schematic diagram of engine；
Fig. 2 is the schematic diagram that the double fuel transportation system of gas and liquid fuel can be selectively conveyed to engine；
Fig. 3 is the flow chart for illustrating the exemplary method how controller manages engine and fuel delivery system；
Fig. 4 is the process for closing the exemplary method of fuel tank valve in response to the leakage in gas fuel delivery system Figure；
Fig. 5 and Fig. 6 shows the operation order of the simulation of the method according to Fig. 7；
Fig. 7 is the flow chart for the exemplary method for emptying the onboard fuel case of pressurization.
Specific embodiment
The present invention relates to close for the leakage in the double fuel transportation system in response to the vehicle-mounted gas including pressurization The method of fuel tank valve.In a non-limiting example, fuel tank can be full of fuel (for example, compression day as shown in Figure 1 Right gas).Then, Fig. 2 shows fuel thereon storage fuel tank is coupled to pressure sensor, wherein pressure sensor In the placement of fuel system leak detection can be realized in mode described herein.In Fig. 3, engine system further includes It can reveal and be closed detecting leakage according to as shown in Figure 4 detected including fuel delivery system based on pressure measurement Close the controller of the method operating of management engine and diagnosis process of fuel tank valve.When leakage is not detected, fuel system is pressed According to working for design, and the sequence of simulation that fuel tank can provide in figs. 5 and 6 according to described is drained. In one example, engine can be run as increasing the extraction of the gas vapor from fuel tank, so that fuel tank can be with More thoroughly emptied.Therefore, the method for Fig. 7 provides the engine for improving direct fuel injection and port fuel spray The emptying for the fuel tank in engine penetrated.
Referring to Fig.1, internal combustion engine 10 is controlled by electronic engine control 12, and wherein engine 10 includes multiple vapour A cylinder in multiple cylinders is shown in FIG. 1 in cylinder.Engine 10 includes combustion chamber 30 and cylinder wall 32,36 quilt of piston It is disposed therein and is connected to crankshaft 40.Combustion chamber 30 is shown via respective inlet valve 52 and exhaust valve 54 and air inlet discrimination Pipe 44 is connected to exhaust manifold 48.Each intake and exhaust valves can be operated by admission cam 51 and exhaust cam 53.It can Instead, one or more in intake and exhaust valves can be grasped by the valve coil and armature component of Electromechanical Control Make.The position of admission cam 51 can be determined by admission cam sensor 55.It the position of exhaust cam 53 can be by exhaust cam Sensor 57 determines.
Direct liquid fuel injector 66 is shown, is arranged to for liquid fuel being directly injected in combustion chamber 30, It is referred to as directly to spray by those skilled in the art.Alternatively, liquid fuel can be injected into air intake duct, by ability Field technique personnel are referred to as intake port injection.Direct liquid fuel injector 66 is proportionally conveyed from 12 pulse width of controller Liquid fuel.Fuel injector 66 receives the liquid by including fuel tank, petrolift and fuel rail via fuel rail 67 The liquid fuel that fuel system 230 conveys.
Direct gaseous-fuel injector 80 is shown, is set as gaseous fuel being directly ejected into combustion chamber 30.Directly Connecing gaseous-fuel injector 80 can be configured as conveying liquid or gaseous fuel.Show air intake duct gaseous-fuel injector 81, it is set as gaseous fuel being ejected into inlet manifold 44.In some instances, air intake duct gaseous-fuel injector 81 can To be arranged in the air intake duct of cylinder cover.In other examples, gaseous fuel can be ejected by gaseous-fuel injector 81 The central area of inlet manifold.Direct gaseous-fuel injector 80 and air intake duct gaseous-fuel injector 81 can be engine 10 provide gaseous fuel.It, can be individually via direct gaseous-fuel injector 80 without via air inlet however, in other examples Road gaseous-fuel injector 81 supplies gaseous fuel.In addition, in other examples, it can be individually via air intake duct gaseous fuel Injector 81 is without supplying gaseous fuel via direct gaseous-fuel injector 80.In general, double fuel transportation system is matched It is set to, so that liquid fuel is directly injected in combustion chamber 30, and gaseous fuel is by intake port injection to inlet manifold 44.
Direct gaseous-fuel injector 80 and air intake duct gaseous-fuel injector 81 are via fuel rail 90 and fuel tank 91 Receive gaseous fuel.Pressure regulator 86 controls the pressure that fuel rail 90 is conveyed to by fuel tank 91.Via pressure sensor Gas pressure in 60 sensing fuel tanks 91.The gas pressure in fuel rail 90 is sensed via pressure sensor 61.Direct gas Fluid fuel injector 80 and air intake duct gaseous-fuel injector 81 can be independently controlled by controller, so as to each different Time conveys different flow rates.
Inlet manifold 44 is illustrated as being connected to optional electronic throttle 62, and electronic throttle 62 adjusts the position of choke block 64 It sets, to control from air inlet 42 to the air mass flow of inlet manifold 44.Electronic throttle 62 is shown positioned at inlet manifold 44 Between air inlet 42.
In response to controller 12, distributorless ignition system 88 provides pilot spark to combustion chamber 30 via spark plug 92. Universal Exhaust Gas oxygen (UEGO) sensor 126 is shown as being coupled to the exhaust manifold 48 of 70 upstream of catalyst.Alternatively, Bifurcation exhaust gas oxygen sensor can substitute UEGO sensor 126.
In one example, catalytic converter 70 may include muti-piece catalyst brick.In another example, it can be used every A multiple emission control systems for all having muti-piece brick.In one example, catalytic converter 70 can be three-way type catalyst.
Controller 12 is illustrated as traditional microcomputer in Fig. 1 comprising: microprocessing unit 102, input/output Port 104, read-only memory 106, random access memory 108, keep-alive memory access 110 and traditional data/address bus.Control is shown Device 12 processed can receive the various signals from the sensor for being coupled to engine 10, in addition to those of discussing letter before Extra, further includes: the engine coolant temperature (ECT) from the temperature sensor 112 for being coupled to cooling cover 114；Coupling It is used to sense the position sensor 134 of the power applied by foot 132 to accelerator pedal 130；From being coupled to inlet manifold 44 Pressure sensor 122 engine manifold pressure (MAP) measurement；Carry out the hall effect sensor of 40 position of self-inductance measurement crankshaft 118 engine position sensor；The measurement of the air quality into engine from sensor 120；And from sensing The measurement of the throttle position of device 58.Atmospheric pressure can also be sensed (sensor is not shown), be handled by controller 12.? Preferred aspect of the invention, engine position sensor 118 generate the equidistant pulse of predetermined quantity in each rotation of crankshaft, Engine speed (RPM) can be determined according to it.
In some embodiments, engine can be coupled to the electric motor/battery system in hybrid vehicle.It is mixed Closing power car can have parallel configuration, arranged in series or its variant or combination.It, can be in addition, in some embodiments Using other engine configurations, such as diesel engine.
During operation, each cylinder in engine 10 is usually subjected to four stroke cycles: circulation include suction stroke, Compression travel, expansion stroke and instroke.In general, during suction stroke, exhaust valve 54 is closed, and inlet valve 52 is beaten It opens.Air introduces combustion chamber 30 via inlet manifold 44, and piston 36 is moved to the bottom of cylinder, to increase combustion chamber 30 Interior volume.Piston 36 close to cylinder bottom and in the position that its stroke terminates (for example, when combustion chamber 30 be in its maximum appearance When product) usually it is generally referred to by those skilled in the art as lower dead center (BDC).During compression travel, inlet valve 52 and exhaust valve 54 close It closes.Piston 36 is mobile towards cylinder cover, so as to air in compression and combustion room 30.Piston 36 terminates in its stroke and near cylinder The position (for example, when combustion chamber 30 is in its minimum volume) of lid is usually generally referred to by those skilled in the art as top dead centre (TDC). In the process of being referred to as injection below, fuel is introduced into combustion chamber.In the following is called the ignition process, it is sprayed Fuel lighted by known ignition means such as spark plug 92, so as to cause burning.During expansion stroke, the gas of expansion Piston 36 is pushed back into BDC.Crankshaft 40 converts piston movement into the rotation torque of rotary shaft.Finally, during instroke, Exhaust valve 54 is opened, and to discharge spent air and fuel mixture to exhaust manifold 48, and piston is back to TDC. Note that above content is only shown as example, and air inlet and exhaust valve are opened and/or closure timings can change, such as with Positive or negative valve overlap, intake lag closing or various other examples are provided.
It is interior Fig. 2 shows that can be delivered to gaseous fuel and liquid fuel via dual or multi fuel rail and selectively The example embodiment of the double fuel transportation system of multiple fuel injectors of burn engine.Although in example fuel delivery system Double fuel guide rail is shown, but in some embodiments, double fuel transportation system can have conveying gas and liquid fuel Single fuel rail.Fuel system 200 includes gas fuel supply system 202, liquid fuel supply system 230 and combustion Expect guide rail 67 and 90.Gas fuel supply system 202 is connected to injector 81 by fuel rail 90, and fuel rail 67 is by liquid Fuel system 230 is connected to injector 66, wherein as non-limiting example, injector 66 and 81 can be defeated by fuel It send to the different cylinders of engine 10.
Gas fuel supply system 202 includes gas fuel source, is compressed natural gas (CNG) in the example embodiment. However, fuels sources are non-limiting, and different fuels sources can be used.Gas fuel supply system 202 includes gas Fuel tank 91 and excess-flow valve 210(EFV).Gas fuel tank 91 can be the gas fuel tank of pressurization, hold under high pressure Gaseous fuel is received, wherein " high pressure " is when gaseous fuel enters fuel rail 90, greater than the pressure of the pressure of liquid fuel.Pressure Force snesor 60 can measure the pressure in gas fuel tank 91, and can be by data communication electron control unit (ECU) 250, electronic control unit (ECU) 250 can be controller 12.In some embodiments, pressure sensor 60 can be placed Near fuel tank 91, and pressure sensor 60 can be attached to fuel tank in other embodiments.Pressure sensor 60 can To be further coupled to hole 205, hole 205 be pressure sensor be removed in the case where (such as when sensor is replaced) Limit the hole of leakage.It in some embodiments, can be according to the pressure duct pressure sensor in gas fuel supply system 202 (such as pressure sensor 224) speculates fuel tank pressure.
Excess-flow valve 210 is coupled to gas fuel tank 91 by fuel supply conduit 215, and fuel supply conduit 215 is High-pressure fuel supply pipeline.Pressure sensor 224 is coupled to fuel supply conduit 215, and measures high-pressure fuel supply pipeline Interior gas pressure.The pressure regulator 86 in 91 downstream of fuel tank controls the pressure for being conveyed to fuel rail 90.Pressure regulator 86 downstream is fuel supply conduit 216, and fuel supply conduit 216, which can be, is coupled to combustion for high-pressure fuel supply pipeline 215 Expect the low pressure fuel line of guide rail 90.Therefore, pressure regulator 86 divides the channel into high-pressure area and area of low pressure.In some realities Apply in example, pressure regulator 86 may include at the import or export of pressure regulator 86 solenoid manipulation beat ON/OFF Valve closing.Compared with high-pressure fuel supply pipeline 215, fuel supply conduit 216 is low pressure line, however, for example, adjusting in pressure After gas is transported in low pressure feed pipeline from fuel tank 91 by device 86, the gas pressure in fuel supply conduit 216 is sometimes It can be relatively high.So, after being injected into engine 10, fuel supplies the gas in fuel supply conduit 216 Answer the pressure in pipeline 216 that can return again to relatively low value compared with the pressure in fuel supply conduit 215.With this side Formula, as the fuel from fuel tank 91 is injected into engine 10, the pressure in fuel supply conduit 216 can be succeedingly It moves up and down.In fuel supply conduit 216 is low Agglomerate Filter 220, is used for by working as gaseous fuel flow from fuel Case 91 filters out debris particles and mist of oil and purification gas fuel when moving down along fuel conduit.
Excess-flow valve 210 controls the gaseous fuel flow from gas fuel tank 91, and is coupled to ECU250.Flow Limitation valve 210 may include from the mechanical EFV222 of actuating, wherein the mechanical EFV222 of actuating can certainly after leakage is repaired To automatically reset.However, working as Flow Limit because excess-flow valve 210 also has the bypass discharge orifice 229 being located in pipeline 219 May exist minute leakage stream when valve 210 processed disconnects.Therefore, mechanical EFV can reduce the fuel stream from fuel tank, and endless Full fuel shutoff stream.After leakage is repaired, pressurizeed again by the leakage stream of discharge orifice 229 to downstream volume, and because This resets EFV automatically.The ability to automatically reset makes EFV become one of Self-resetting type.In order to which pipeline is re-pressurized, There must be enough gas in fuel tank, to refill fuel conduit.
Fuel tank valve component can also include solenoid valve 212, and wherein solenoid valve 212 is included and completely cuts through air-flow. If flow is more than the threshold value for indicating to the maximum of engine to allow fuel stream, excess-flow valve cuts off the combustion from fuel tank Stream.Because solenoid valve 212 is mechanical device, it, which has, is set to when the fuel stream to engine be more than that engine is allowed to fire Expect the single setting disconnected when maximum flow rate.In some embodiments, fuel tank valve component can also include check-valves 214, Allow to supplement fuel when solenoid valve 212 is closed.Embodiment in another example, excess-flow valve 210 can be omitted check-valves, And it can be the solenoid valve 212 controlled by ECU250.In another embodiment (not shown), different gaseous fuels can be used Gas fuel supply system 202 is supplied in source (liquid fuel source such as pressurizeed).
Gas fuel supply system 202 includes filling container 228, and fuel tank 91 is allowed to pass through fuel conduit 217 again Full of fuel.Two duplicate one way stop peturn valves 226 are also included in fuel conduit 217, to prevent gaseous fuel from fuel Supply line 215 flow to the atmosphere outside gas fuel system.Repetitive component is included, to be kept open in check-valves Sealing gas fluid in the case where (for example, due to being frozen out).Gaseous fuel is added at filling container 228, and is passed through Fuel conduit 217 flow to fuel supply conduit 215, and further by fuel conduit 218, wherein one way stop peturn valve 214 is to permit Perhaps gas fuel tank 91 is flow to from filling container 228 and the mode flowed out from gas fuel tank 91 is prevented to be directed.
Turning now to liquid fuel system, liquid fuel supply system 230 includes liquid fuel source, valve 232, check-valves 235 and pressure relief valve 236.In the exemplary embodiment, liquid fuel source includes the liquid fuel tank of hydraulically full fuel 244 240, fuel level sensor 246 and petrolift 248.Liquid fuel 244 can be inhaled into petrolift 248 from import 234, And it is pumped into supply line 237.Petrolift 248 is controlled by ECU250.It can be with by the optional high-pressure pump of ECU250 control It is inserted in the downstream of petrolift 248, to increase the liquid fuel pressure for entering fuel rail 67.Fuel level sensor 246 It can be liquid level sensor, can detecte the amount of storage in fuel tank 240, and amount of storage is communicated to ECU250.Liquid Fluid fuel case 240 can also include ventilation opening, be used to that air or fuel vapour to be allowed to flow in or out fuel at atmosheric pressure Case.
One way stop peturn valve 235 is present between liquid fuel source and valve 232, to lead when liquid fuel is transported to fuel Prevent liquid fuel from flowing back into liquid fuel source when rail 67.The pressure relief valve being connected between liquid fuel source and valve 232 236 provide return flow path to be forced off the liquid fuel of fuel rail 67.When the return flow path of pressure relief valve 236 is introduced back To when pump inlet shown in Fig. 2, pressure can be closed in petrolift 248 or be released when operating under portion voltage/velocity/pressure It puts.However, in some embodiments, the return flow path of pressure relief valve 236 can be introduced back into be indicated by liquid fuel 244 The inside of fuel tank.In this configuration, pressure relief valve 236 can be coupled to the pressure of 232 entrance of solenoid valve.For The threshold value that pressure relief valve 236 is opened can be greater than the pressure generated due to liquid fuel source, and be less than and be used for gas injection Minimum pressure.When liquid fuel flow to fuel rail 67 from liquid fuel source, pressure relief valve 236 is closed.In example reality It applies in example, valve 232 includes ball-cock assembly.Ball-cock assembly includes the ball for floating in liquid fuel within but sinking in gaseous fuel.When floating When ball in ball valve sinks, it blocks the path by valve, therefore valve is closed.Liquid fuel can flow through ball-cock assembly, but gas Fluid fuel cannot flow through ball-cock assembly.In other embodiments, valve 232 can be the solenoid valve controlled by ECU250.In another reality It applies in example, valve 232 can be integrated into the single valve of supply fuel rail.In another embodiment, valve 232 can be non-return Valve, liquid fuel accumulator can be attached to fuel rail 67, and pressure relief valve 236 can be omitted.
In Fig. 2, fuel system 200 includes with the import for the liquid fuel from supply line 239 Fuel rail 67, the fuel rail 90 with the import for the gaseous fuel from fuel supply conduit 216 and for will Pressure sensor 61 of the pressure communication of fuel rail to ECU250.Fuel rail is usually tubulose, and therefore depends on Vehicle tends to, and fuel rail has discharger preferably on every end, so as to from fuel rail draining liquid fuel.Fuel The output of gas fuel supply system 202 is connected to fuel rail 90 by supply line 216.Fuel injector 81 is installed in combustion The top of guide rail 90 is expected, so that the nozzle of air supply of fuel injector at least partially faces surface.In some embodiments, it installs Fuel injector above fuel rail can using gas (or steam) fuel first, and be mounted below fuel rail Fuel injector uses liquid fuel first.
When fuel injector 66 is just in injecting LPG in liquefied condition, petrolift 248 and optional high-pressure pump are opened, and valve 232 is opened, And pressure relief valve 236 and excess-flow valve 210 are closed.Liquid fuel flows into import 234 from liquid fuel tank 240, and passes through Supply line 237 and 239 flow to fuel rail 67.Gaseous fuel of the fuel rail 67 full of pressurization, can be by fuel injection Device 66 is proportionally sprayed with the pulse width for receiving the signal FPW-2 from controller 12.
When fuel injector 81 is spraying gaseous fuel, petrolift 248 and optional high-pressure pump can be closed, valve 232 It closes, and excess-flow valve 210 is opened.Gaseous fuel, which is flowed by fuel supply conduit 215 and 216 from gas fuel tank 91, to be fired Expect guide rail 90.Gaseous fuel of the fuel rail 90 full of pressurization by fuel injector 81 and can be received from controller 12 The pulse width of signal FPW-2 proportionally sprayed.
In order to be changed into gaseous fuel from liquid fuel, petrolift 248 and optional petrolift are disabled, and flow restriction Valve 210 is opened.In some embodiments that single fuel rail is used to two kinds of fuel of injection, during transformation, fuel rail Gaseous fuel and liquid fuel can be contained simultaneously.Pressurized fuel gas flows into fuel rail, and rises to the top of fuel rail Portion.The position of injector at the top of fuel rail and orientation accelerate the transformation from liquid fuel to gaseous fuel, because on The gaseous fuel risen is preferentially delivered to injector.Gaseous fuel even can be in fuel rail by the injection of fuel injector Start before being fully degassed liquid fuel.Force liquid fuel by the inclusion of pressure relief valve 236 using pressurized fuel gas Path flow back into liquid fuel tank 240 from fuel rail.But when gaseous fuel reaches ball-cock assembly 232, the transformation is completed. When ball-cock assembly 232 is evacuated liquid fuel, ball-cock assembly 232 is sealed, to prevent gaseous fuel from entering liquid fuel supply system System 230.
On the contrary, in the example system with single fuel rail, to be changed into liquid fuel, Flow Limit from gaseous fuel Valve 210 processed is closed, and petrolift 248 and optional petrolift are opened.As liquid fuel flows into fuel rail, remained in fuel rail Remaining gaseous fuel is transported to injector.Gaseous fuel is promptly extracted from fuel rail because fuel rail keep with Liquid fuel compares the gaseous fuel of small quality.
It can be controlled by ECU250 above with reference to various parts described in Fig. 2, wherein ECU250 includes having meter The controller 12 of calculation machine readable instruction, described instruction adjust Vehicular system, multiple sensors 252 and multiple execution for executing The program and subprogram of device 254.
The determination how Fig. 3 controller 12 monitors in sensor (such as pressure sensor 60) and reading system is conveyed to hair The flow chart of the exemplary method 300 of the diagnostic code of the fuel quantity and fuel type of motivation system 10.At 302, method 300 is wrapped Include the means of the sensor in monitoring fuel system 200.For example, pressure sensor 60 can measure in gas fuel tank 91 Pressure, and pressure sensor 224 measure high-pressure fuel supply pipeline 215 in pressure.Each of these sensors are right Afterwards can be by data communication to controller 12, controller 12 can be determined further in high-pressure feed road using information is No memory leak.If detecting leakage, controller 12 can set the diagnostic code for indicating leakage, and code status is stored Into the memory for being communicated with vehicle occupant '.If leakage is not detected at 302, gas fuel supply system 202 It can continue according to specified operation, and method 300 enters 304.
At 304, method 300 determines engine operating condition including the use of controller 12.Then, based on the condition detected, Gas or liquid fuel or combinations thereof can be delivered to fuel rail by controller 12, to provide power for engine 10. For example, the engine with high intake manifold pressure can indicate that engine is just run under higher engine load.In order to Engine load is adapted to, controller 12 is adjustable to be ejected into motor intake manifold in response to motor intake manifold pressure Or the gaseous fuel quantity in cylinder air inlet road, in order to provide desired engine torque.After adjustment engine operation, method 300 can continue to monitor engine system, and make further adjustment in response to the sensor in engine system.
Fig. 4 shows the leakage in response to detecting in gas fuel delivery system and closes the example side of fuel tank valve The flow chart of method 400.For example, the pressure piping circuit that fuel conduit leakage will lead to vehicle, which is destroyed, becomes atmospheric pressure.Therefore, When the gaseous fuel stored under high pressures flow to the leakage region with lower pressure, the fuel from storage fuel tank Flow rate will increase.Despite the presence of leakage, but some gaseous fuels can be still assigned to the injector of engine, some gas combustions Material can also be removed from fuel system.Therefore, fuel delivery system is generally equipped with excess-flow valve, wherein when leakage exists When, which closes to reduce the air-flow of evolution.For this reason, flow valve described herein includes quilt It is coupled to the solenoid valve of mechanical flow limitation valve, limits fuel stream when leakage to detect in gas fuel system.
Pressure difference can be caused by leakage occur at 402, in gas fuel system.In response to pressure difference, gaseous fuel can be from It is flowed out in fuel tank, and thereby reduces the quality of the fuel content of storage.For example, fuel filling container may be frozen It opens, if EFV is not turned off to limit the fuel stream from fuel tank, this can cause fuel to be revealed from system.In response to system In leakage, method 400 include monitoring fuel delivery system in sensor.For example, controller 12 can receive from fuel The data of pressure sensor 61 in guide rail or the pressure sensor 60 near storage fuel tank.Based on the received number of institute According to the controller 12 including microprocessor unit and various memory cells can be compiled based on the leakage in fuel delivery system Journey is to make adjustment.
At 404, method 400 includes fuel flow rate of the measurement from fuel tank, and by the flow rate of measurement and selected instruction The threshold flow rate of possibility leakage in system is compared.For example, the leakage in low-pressure fuel supply line 216 can cause by pressing The pressure reduction that force snesor 61 measures.The decline of the pressure can cause fuel injector 81 more muchly to stay open, this is anti- Come over to cause pressure regulator 86 to make a response by increasing the fuel stream from fuel tank, is supplied to injector to be promoted Fuel pressure.
At 406, the fuel flow rate more than threshold value can cause excess-flow valve to be closed fiercely, this will limit from fuel The fuel stream of case.Then, at 408, in response to the decline due to spraying pressure caused by restricted gaseous fuel flow, control Fuels sources can be switched to liquid fuel by device 12 processed.If machinery EFV is from actuating (this means that it can be in leakage quilt Automatically reset after repairing), valve can still have minute leakage stream when disconnecting.Therefore, mechanical EFV, which can be reduced considerably, comes From the fuel stream of fuel tank, not fully fuel shutoff stream.Therefore, in order to ensure no longer from storage fuel tank further loss combustion Material, at 410, fuel tank valve and/or regulating valve are closed by controller 12.Be back to 404, if measurement from fuel tank Fuel stream be lower than threshold flow rate, controller 12 can determine fuel delivery system according to the operation of design, and continue monitoring combustion Sensor in material system.
There is leakage in gas fuel system to determine, method 400 further utilizes the sensor in system Data leak to diagnose.Therefore, at 412, method 400 includes by high-pressure fuel supply pipeline (PHPL) in pressure and fuel Case (PTank) in gas pressure be compared, so as to determine leakage whether be already present in high-pressure fuel supply pipeline.Example Such as, if hole gas leakage in high-pressure fuel line (such as fuel supply conduit 215), since some gases are defeated from fuel It send in system and escapes, can be reduced in the pressure of fuel tank measured downstream.Therefore, it is surveyed by the pressure sensor 224 in fuel conduit The pressure of amount can be substantially below the pressure of the fuel tank measured by pressure sensor 60.If fuel line pressure PHPLIt keeps Under the first lower threshold, and fuel tank pressure PTankOn upper limit threshold, such PHPLWith PTankBetween difference be greater than the One poor threshold value, then method identifies the leakage in fuel supply conduit, and is set as referring to by diagnostic code at 418 at 414 Show leakage.When the leakage in gas fuel system is identified, fuel tank valve and solenoid valve can be remained turned-off, until vehicle quilt It overhauls or vehicle is turned on again in some cases.
412 are back to, if PHPLEssentially equal to PTank, method continues to monitor the pressure data from fuel rail, with Determine the presence leaked in system.Therefore, at 420, method 400 includes by low pressure fuel line (PLPL) in pressure and warp The fuel pressure of adjusting sets (PRegulator) be compared.For example, if low pressure fuel line pressure PLPLWith the pressure through adjusting Power PRegulatorBetween difference be greater than the second poor threshold value, the presence leaked in system is identified.In addition, if PLPLIt is lower than PRegulator, leaking may be isolated with the low pressure fuel line in such as fuel supply conduit 216 or fuel rail 90.However, such as Fruit PLPLGreater than PRegulator, leak and be likely to be present in high-pressure area.As an example, if pressure regulator diaphragm is broken It splits, then, when gaseous state content flow to fuel rail, the pressure in fuel rail be will increase, this can also in some cases Cause the damage to injector.Therefore, method 400 can also be used to reduce the damage in fuel system.If fuel conduit Pressure PLPLWith PRegulatorBetween difference remain unchanged, at 414, method identifies the leakage in fuel supply conduit, and 418 Diagnostic code is set as instruction leakage by place.By with above in a manner of identical described in square box 412, when gas fires When leakage in material system is identified, fuel tank valve and solenoid valve can be remained turned-off up to vehicle is overhauled or connect again It is logical.
At 420, if PHPLAnd PLPLIt is essentially equal to P respectivelyTankAnd PRegulator, then, even if EFV is disconnected, side Method 400 can still continue the operation according to design.Method 400 provides following advantage, not actually exists leakage in working as system When EFV disconnect in the case where, leak detection system can automatically reset.
The method for turning to the onboard fuel case for emptying pressurization, in order to keep fuel tank emptying, controller 12 may include For the instruction of various security features described in override, described instruction closes fuel tank valve in response to leakage.Therefore, work as reality When border or supposition fuel tank pressure is lower than threshold tank pressure, it still is able to empty fuel tank by method hereinafter Content.However, fuel rail pressure can be down to sometimes under pressure upon mediation in order to keep fuel tank discharge clean, This is that the method 400 for the leakage that low fuel rail pressure can be interpreted as to triggering solenoid valve closing proposes problem. Therefore, in order to empty the content in fuel tank, controller 12 can also have override leak detection system and keep fuel The ability that case valve is opened, thus this allows the content of fuel tank to be drained in the manner described.
Fig. 5 is shown when engine has air intake duct gaseous-fuel injector without direct gaseous-fuel injector According to the operation order of the simulation of the method for Fig. 7.The sequence of Fig. 5 can be provided by the system of Fig. 1 according to the method for Fig. 7.When Between T0-T5Place shows vertical label, with the interested specific time during recognition sequence.
Indicate that motor intake manifold pressure changes with time from the first curve at the top of Fig. 5.Y-axis line indicates engine Intake manifold pressure and intake manifold pressure increase along the direction of Y-axis line arrow.X-axis line indicates the time, and the time is from Fig. 5's Left side increases to the right side of Fig. 5.Level marks 502 indicate environmental air pressure.More than environmental pressure pressure in level marks On 502.Lower than environmental pressure pressure under level marks 502.
Indicate that liquid fuel the amount of injection changes with time from the second curve at the top of Fig. 5.Y-axis line indicates injection to starting The liquid fuel amount of machine, and the liquid fuel amount sprayed increases along the direction of Y-axis line arrow.X-axis line indicates the time, and Right side of the time from the left side of Fig. 5 to Fig. 5 increases.
It indicates to spray via air intake duct gaseous-fuel injector to the gaseous fuel of engine from the third curve at the top of Fig. 5 The amount of injection changes with time.Y-axis line indicates the gaseous fuel quantity sprayed via air intake duct or central-injection device.Injection is to starting The gaseous fuel quantity of machine increases along the direction of Y-axis line arrow.X-axis line indicates the time, and the time is from the left side of Fig. 5 to Fig. 5's Right side increases.
The deactivated state of air intake duct gaseous-fuel injector and the combustion of air intake duct gas are indicated from the 4th curve at the top of Fig. 5 Whether material ejector is deactivated.The operating status of Y-axis line expression air intake duct gaseous-fuel injector.When signal is in low-level When, air intake duct gaseous-fuel injector is activated.When signal is in higher level, air intake duct gaseous-fuel injector is stopped With.X-axis line indicates the time, and right side of the time from the left side of Fig. 5 to Fig. 5 increases.
Indicate that gaseous fuel guide rail/storage fuel tank pressure changes with time from the 5th curve at the top of Fig. 5.Y-axis line Indicate the fuel pressure in fuel pressure gaseous fuel storage fuel tank, and fuel pressure increases along the direction of Y-axis line arrow. X-axis line indicates the time, and right side of the time from the left side of Fig. 5 to Fig. 5 increases.Level marks 504 indicate such threshold value combustion Hopper pressure, wherein liquid fuel injection are activated for providing desired burning within the engine.In one example, horizontal Label 504 indicates such fuel pressure, wherein the gaseous fuel for being less than desired amount flow to engine rather than provides aspiration level Engine torque desired amount gaseous fuel.When gas fuel pressure reaches X-axis line, gas fuel pressure is in environment Pressure.
In time T0Place, motor intake manifold pressure is relatively low, indicates low engine load.Liquid fuel the amount of injection base It originally is zero, and engine is only run with gaseous fuel, however engine may have been transported when earlier with liquid fuel Row (for example, during engine start).Gaseous-fuel injector is activated, as passed through gaseous-fuel injector dead status institute It indicates.The gaseous fuel quantity being stored in gas fuel tank is in higher level.
In time T0With time T1Between, motor intake manifold pressure increase indicates engine just in higher engine It is run under load.With motor intake manifold pressure increase, the gas being ejected into motor intake manifold or cylinder air inlet road Fluid fuel amount increases, therefore can provide desired engine torque.Air intake duct gaseous-fuel injector keeps activating, and with Gaseous fuel be consumed by the engine, the pressure reduction in gas fuel tank.
In time T1Place, intake manifold pressure reach the higher pressure that gaseous-fuel injector is deactivated.Gaseous fuel spray Emitter can be deactivated, therefore when additional air is allowed to flow into engine to mix with liquid fuel, engine output It can further increase.When air intake duct or center gas fuel injector are deactivated, additional air flow to engine, because Volume in inlet manifold is not replaced by gaseous fuel.Therefore, the liquid fuel amount sprayed is in time T1With time T2Between increase Add, to increase engine output, to meet desired engine torque.When motor intake manifold pressure rise, gas Fuel injector can operate, and be not in deactivated state.As gaseous fuel is consumed, gas fuel tank pressure continues to drop It is low.Under some cases when engine exports high, the mixture of liquid and gaseous fuel can be conveyed, to generate desired hair Motivation torque.
In time T2Place, motor intake manifold pressure reduction to gaseous-fuel injector export increase and liquid fuel The level that injector is deactivated.Gaseous-fuel injector keeps activation, and as gaseous fuel is consumed, gas fuel tank pressure Power continues to reduce.
In time T2With time T3Between, intake manifold pressure increases and reduces with engine load.In response to driving The torque that the person of sailing requires, engine load can increased or decrease.Gaseous-fuel injector keeps activation, and gaseous fuel quilt It sprays to engine.As gaseous fuel is consumed by the engine, be stored in gaseous fuel storage fuel tank in gaseous fuel quantity Continue to reduce.
In time T3Place, is stored in the pressure reduction of the gaseous fuel in gas fuel tank to less than by level marks 504 The level of predetermined threshold fuel tank pressure indicated by (such as 250psi).It is being lower than the threshold value as indicated by level marks 504 At the pressure of fuel tank pressure, the fuel less than desired amount can flow to engine from gaseous fuel storage fuel tank.By level Threshold tank pressure indicated by label 504 can change for different operating conditions.For example, with motor intake manifold Pressure increase, the threshold tank pressure as indicated by level marks 504 can increase.On the contrary, in some embodiments, working as gas When fluid fuel case pressure is down under the threshold tank pressure as indicated by level marks 504, fuel rail pressure can also be with In response to fuel tank pressure reduction and decline.For example, when gaseous fuel is unique fuels sources, under fuel rail pressure Caused by drop is the decline due to fuel tank pressure because fuel tank pressure also correspond to pressure in high-pressure fuel line and Spray pressure.
In time T3Place, air intake duct or center gas fuel injector keep activation, and gaseous fuel continues to flow to hair Motivation.However, increasing the gaseous fuel quantity for being supplied to engine by spraying liquid fuel to engine.Therefore, liquid Fuel injector is activated, to supply fuel to engine cylinder.By this method, combustion stability and air-fuel ratio control can be with It is controlled as desired level.In addition, when intake manifold pressure increases with the increase of engine load, less gas Fuel can be introduced into motor intake manifold.Therefore, as intake manifold pressure increases, as two kinds of combustions for entering engine The liquid fuel amount of a part of material increases.When intake manifold pressure is reduced with engine load, more gas combustions Material can be introduced into engine, and therefore spray to the ratio reduction of the liquid fuel of engine.Engine exhaust system In lambda sensor can be used to correct liquid fuel amount, so as to when with enter engine cylinder air mix when, gas Desired air and fuel mixture is provided with the combination mixture of liquid fuel.Disappeared as gaseous fuel is consumed by engine The pressure of consumption, the gaseous fuel being stored in gas storage fuel tank continues to reduce.
In time T4Place, the level of motor intake manifold pressure increase to more than environmental air pressure, and therefore into Air flue or center gas fuel injector are deactivated, and are temporarily ceased to in-engine gaseous fuel flow.Deactivate gas combustion Material ejector reduces a possibility that surrounding air enters gas storage fuel tank when intake manifold pressure is high.By this method, It can prevent air from entering storage fuel tank under higher intake manifold pressure and lower storage fuel tank pressure.Work as pressure When contracting machine gives the air pressurized for entering engine, intake manifold pressure can reach the pressure higher than environmental pressure.
In time T4Soon later, the level of motor intake manifold pressure reduction to less than environmental pressure, and gas Fuel injector is reactivated.Because intake manifold pressure is lower than environmental pressure, motor intake manifold can assist gas Flowing of the fuel from storage fuel tank to engine.Therefore, under the auxiliary provided by the low pressure in motor intake manifold, The fuel pressure in gas storage fuel tank can be reduced.As gaseous fuel quantity continues to reduce, liquid fuel injector continues Fuel is provided for engine.
In time T5Place, the pressure that gas stores in fuel tank are reduced to environmental pressure, and gaseous-fuel injector It is deactivated, to prevent surrounding air from entering gas storage fuel tank.In addition, the pressure when gas fuel tank reaches environmental pressure When deactivate gaseous-fuel injector vacuum prevented to be formed in gas storage fuel tank, therefore not in atmosphere and gas fuel tank Between cause to flow.In time T5Only liquid fuel injector to engine provides fuel, and liquid fuel amount and energy later Enough engine loads reflected in the form of motor intake manifold pressure are related.In other examples, if it is desired, gas is deposited Storage fuel tank can be reduced to scheduled vacuum.By this method, the pressure in gas fuel tank can be lowered, so as to gas Generally all fuel in storage fuel tank can be used to provide the energy for running engine.In addition, by this method Provide makes engine run to the smooth operating made between engine operating merely with liquid fuel merely with gaseous fuel Transformation.
Referring now to Fig. 6, the operation order of the second simulation of the method according to Fig. 7 is shown.The sequence of Fig. 6 includes similar In the curve those of being shown in FIG. 5.Therefore, for simplicity the description of similar curve is omitted.Describe attached drawing it Between difference.The sequence of Fig. 6 can be provided by the system of Fig. 1 according to the method for Fig. 7.In time T0-T6Place shows vertical mark Note, with the interested specific time during recognition sequence.
Example difference in example and Fig. 5 in Fig. 6 is that engine has the gaseous fuel directly sprayed.If injection Occur after IC Intake Valve Closes, then directly injection needs quite high injection pressure, therefore leaves in fuel tank than can Can during fuel supplement desired more pressure.This example supplies it to turn from the direct gas injection after IVC Then direct injection before becoming IVC may be later PFI or CFI.Due to encountering gaseous fuel conveying limitation, pass through liquid Fluid fuel increases gaseous fuel.Furthermore it is possible to change inlet valve timing, to increase engine vacuum, therefore gas combustion is realized The further emptying of hopper.
The cylinder that engine is ejected into via first gas direct fuel injector is shown from the third curve at the top of Fig. 6 Interior gaseous fuel quantity.The expression of Y-axis line is sprayed via gas direct fuel injector to the gaseous fuel quantity of engine.Gas combustion Doses increases along the direction of Y spool arrow.X-axis line indicates the time, and right side of the time from the left side of Fig. 6 to Fig. 6 increases.
It shows from the 4th curve at the top of Fig. 6 and sprays via second gas air intake duct or central fuel injector to starting Gaseous fuel quantity in machine gas handling system.The expression of Y-axis line is sprayed via gas inlet road or central fuel injector to engine Gaseous fuel quantity.Gaseous fuel quantity increases along the direction of Y-axis line arrow.X-axis line indicates the time, and the time is from a left side of Fig. 6 The right side of lateral view 6 increases.
The deactivated signal of instruction gaseous-fuel injector is indicated from the 5th curve at the top of Fig. 6.When signal is in medium water Usually, direct gaseous-fuel injector is deactivated.When signal is in higher level, direct gaseous-fuel injector and air inlet Road or center fuel gas ejector are all deactivated.When signal be in it is lower level when, direct gaseous-fuel injector and into Air flue or center combustion gas body material ejector are all activated, but need not spray gaseous fuel.
Level marks 602 indicate environmental pressure.Pressure on level marks 602 is higher than environmental pressure.It is marked in level Pressure under note 602 is lower than environmental pressure.Level marks 604 indicate first threshold fuel tank pressure, wherein adjusting engine Operation, to continue to allow direct gaseous-fuel injector to continue to spray gaseous fuel to cylinder.Level marks 606 indicate the Two threshold tank pressures, wherein direct gaseous-fuel injector is deactivated.Level marks 608 indicate third threshold fuel case pressure Power, wherein the injection of liquid fuel starts when the air-flow by air intake duct or central fuel injector slows down but continues.
In time T0Place, intake manifold pressure is low, and instruction engine is just run at low load.Liquid fuel injector is not By fuel injection to engine, and neither air intake duct gaseous-fuel injector is also not center gas fuel injector.Directly It connects gaseous-fuel injector and provides fuel to engine, and the pressure in gas storage fuel tank is relatively high.
In time T0With time T1Between, motor intake manifold pressure increases and reduces with engine load.Directly Connecing gaseous-fuel injector during compression travel allows to convey fuel under to the pressure of engine directly sprayed.Into starting The air of machine can be compressed via compressor.The inlet valve for receiving the cylinder of gaseous fuel can be within this time with top dead centre The crankshaft angles+20 of suction stroke are opened.Pressure reduction as engine continues to run, in gas fuel tank.
In time T1Place, gas stores the pressure in fuel tank and reaches first threshold fuel tank pressure, and adjusts and start Machine operation, to allow the fuel injection by direct gaseous-fuel injector to continue.In one example, when the pressure in cylinder When power is lower, fuel injection timing from being moved to during suction stroke during compression travel.Therefore, fuel continues to flow through directly Connect gaseous-fuel injector.In addition, inlet valve opening time can be delayed to the crankshaft being later than after top dead centre suction stroke Angle 20, to reduce the pressure in cylinder during fuel injection.
In time T2Place, gas stores the pressure in fuel tank and reaches second threshold fuel tank pressure, wherein direct gas Fuel injector is deactivated, and fuel begins to flow through air intake duct or center gas fuel injector.Due to air-distributor vacuum It is low, further emptying storage fuel tank is started by the gaseous fuel injection of center gas fuel injector.In time T2With T3It Between, gaseous fuel continues through center or the emptying of air intake duct gaseous-fuel injector.
In time T3Place, gas store the pressure in fuel tank and reach third threshold tank pressure, wherein liquid fuel Injector starts to spray liquid fuel to engine, so as to when there may be promote when insufficient pressure in gas storage fuel tank Into stable burning, to make engine with the desired torque operation of driver.Gaseous fuel is also continued with lower rate It is flow to engine, so that further vent gas stores fuel tank.
In time T4With time T5Between, intake manifold pressure increases to greater than the level of environmental pressure.Air intake duct or center Gaseous-fuel injector is temporarily deactivated, and is stopped to the gaseous fuel flow of engine.Gaseous fuel to engine sprays It penetrates in time T5Continue later.
In time T6Place, gas stores the pressure in fuel tank and reaches environmental pressure, and directly fires with air intake duct gas Material ejector is all deactivated.Based on engine load, continue to spray liquid fuel to engine.
Therefore, in some instances, it can directly be run with air intake duct gaseous-fuel injector, be fired with vent gas Material storage fuel tank.Although Fig. 5 and Fig. 6 refer to gaseous-fuel injector, which is not limited to gaseous fuel, and can answer With other gases (such as nitrous oxide).
Referring now to Fig. 7, the flow chart of the exemplary method of the fuel tank for emptying pressurization is shown.This method can be made It is stored in the non-transitory memory in controller shown in FIG. 1 and system for executable instruction.This method can provide The sequence of Fig. 5 and Fig. 6.
At 740, method 700 include determined in response to the leakage in gas fuel system diagnostic code whether by The means of setting.If controller 12 determines that the diagnostic code of instruction leakage is set, excess-flow valve can also be closed, To limit the air-flow from fuel storage fuel tank.Because air-flow is cut off, method 700 further includes making fuel delivery system to lack The means of mode operation are saved, the default mode is pointed out at 742.When being run with default mode, controller 12 opens fuel Pump 248, so that liquid fuel 244 is delivered to fuel rail 67 from liquid fuel tank 240, it is dynamic to be provided for engine 10 Power.740 are back to, if controller 12 determines that the diagnostic code of instruction leakage is not set, fuel system 200 can be after The continuous operation according to design, and based in fuel tank 91 remaining gaseous fuel quantity and driver requested torque convey combustion Material.
At 702, method 700 determines engine operating condition.Engine operating condition can include but is not limited to engine speed, hair Engine load, gas fuel pressure, environment temperature and engine coolant temperature.After engine operating condition is determined, method 700 enter 704.
At 704, method 700 judges whether engine includes direct gaseous-fuel injector.Engine fuel injector Configuration can be stored in memory.If method 700 judges that engine includes direct gaseous-fuel injector, answer is "Yes", and method 700 enters 706.Otherwise, answer is "No", and method 700 enters 720.
At 706, method 700 judges whether the pressure of gaseous fuel is greater than first threshold fuel tank pressure.If method 700 judge that gas fuel pressure is greater than first threshold fuel tank pressure, and answer is "yes", and method 700 enters 714.It is no Then, answer is "No", and method 700 enters 708.It can be stored with sense gasses in fuel tank or along storage fuel tank and hair The gas fuel pressure of pipeline or channel between motivation.In one example, it determines under the pressure regulator in fuel rail Swim the gas fuel pressure at position.
At 714, method 700 runs engine via by direct gaseous-fuel injector injection gaseous fuel. Direct gaseous-fuel injector sprays gaseous fuel during at least part compression travel；However, the hair of gaseous fuel injection Life can start in suction stroke last (for example, 20 crank angle degrees before the suction stroke of lower dead center).Inlet valve timing also by Setting is basic valve timing, and wherein inlet valve opens+20 crank angle degrees of top dead centre suction stroke.It is sprayed in gaseous fuel After time is determined and is conveyed, method 700 enters 716.
At 716, method 700 deactivates liquid fuel injection (for example, Fuel Petroleum injection).Liquid fuel injection is stopped With to save liquid fuel.In one example, for being cold-started engine, liquid fuel can be saved.Therefore, start Then machine can be changed into and be run merely with gaseous fuel to use liquid fuel to start.The injection quilt of liquid fuel within After deactivating, method 700, which enters, to be exited.
At 708, method 700 adjusts direct gaseous fuel injection, to spray big portion during the suction stroke of cylinder The gaseous fuel divided.For example, the gaseous fuel sprayed during cylinder cycle being injected in during the suction stroke of cylinder 80%.In addition, because of gaseous fuel instead of the fresh air from a part of cylinder volume, while inlet valve is open, institute With in such a mode, amount of engine torque can be limited to less than the threshold quantity of torque.If driver requested torque is big It can be activated in the injection of threshold engine torque, liquid fuel, to provide desired operator torque.In addition, one In a example, inlet valve opening (IVO) time is adjusted to (at least be later than only for example, being delayed until at suction stroke end Crankshaft angles 20 after point suction stroke).In other examples, IVO, which can be delayed by, is later than after top dead centre suction stroke Crankshaft angles 90.After direct gaseous fuel injection timing and inlet valve timing are adjusted, method 700 enters 710.
At 710, method 700 judges whether gas fuel pressure is greater than second threshold fuel tank pressure.If it is in this way If, answer is "yes", and method 700 is entered and exited, and direct fuel injection, and according to 708 adjustment inlet valves Timing.Otherwise, answer is "No", and method 700 enters 712.
At 712, method 700 deactivates direct gaseous-fuel injector, and gaseous fuel direct is connected in engine cylinder Injection stops.It can be closed by the direct gaseous-fuel injector of direct command to deactivate direct gaseous-fuel injector.Straight It connects gaseous-fuel injector to be deactivated, method 700 enters 720.
At 720, when air intake duct or available center gas fuel injection, method 700 activates air intake duct or central-injection Gaseous fuel injection.Air intake duct or center gas fuel injection can be used for liquid as shown in Figure 1 and direct gaseous fuel Injection.In addition, fuel injection system may include air intake duct or center gas fuel injection and liquid fuel injection, without including Direct gaseous fuel injection.After air intake duct or center gas fuel injector are activated, method 700 enters 722.
At 722, whether method 700 judges the gas fuel pressure in gaseous fuel storage fuel tank or in fuel rail Greater than third threshold tank pressure.If it were to be so, answer is "yes", and method 700 enters 724.If no It is in this case, answer is "No", and method 700 enters 726.
At 724, method 700 is based on engine operating condition (for example, engine speed and load) via air intake duct or center Fuel injector sprays gaseous fuel.In addition, engine valve timing can be set to basic valve timing, wherein inlet valve It is opened in the crankshaft angles+20 of top dead centre suction stroke.In some instances, when driver requested torque is greater than threshold value When, liquid fuel injection can be activated, so that engine can satisfy driver requested torque.In air intake duct or central gas After fluid fuel injector supplies gaseous fuel to engine according to engine operating condition, method 700, which enters, to be exited.
At 726, method 700 activates liquid fuel injection, and adjusts desired exhaust λ value.Exhaust λ value is to pass through chemistry The oxygen concentration that stoichiometry air provides is divided by the oxygen concentration provided by desired or actual air-fuel ratio.Therefore, when λ is greater than 1 When, engine air-fuel gaseous mixture is dilute, and when λ is less than 1, engine air-fuel gaseous mixture is dense.Via exhaust Lambda sensor in system provides the feedback of λ value.In one example, entered according to gas fuel pressure and injecting time estimation The gaseous fuel quantity of cylinder.It is not enough to provide the engine torque of aspiration level if there is the gaseous fuel flow to cylinder, then Injecting LPG in liquefied condition and gaseous fuel, to meet desired engine torque.Such as, if it is desired to engine torque be 200N-m, and the gaseous fuel quantity sprayed is capable of providing 60N-m, then liquid fuel injector is opened, to provide 140N-m Torque.Engine air amount is adjusted via the position or valve timing that adjust air throttle, to provide desired λ value.Therefore, When motor intake manifold pressure increases due to the increase of engine load, gaseous fuel flow is reduced, and liquid fuel stream Increase.In addition, being conveyed to the liquid of engine when motor intake manifold pressure is reduced due to the reduction of engine load Fuel reduces relative to the ratio for the total fuel quantity for being supplied to engine.In the fire that gas and liquid fuel amount are provided, method 700 enter 728.
At 728, method 700 judges whether manifold absolute pressure (MAP) is greater than in storage fuel tank or in fuel rail Gas fuel pressure.If it were to be so, answer is "yes", and method 700 enters 732.Otherwise, answer is "No", and method 700 enters 730.
At 730, whether method 700 judges to store the gas fuel pressure in fuel tank or fuel rail in environmental pressure Threshold pressure in.For example, method 700 judges to store the pressure in fuel tank whether in 1 bar of atmospheric pressure.If gas fires Pressure is expected in the threshold pressure of environmental pressure, and method 700 enters 732.Otherwise, method 700, which enters, exits.
At 732, method 700 deactivates the gaseous fuel injection of engine.Simply order gaseous fuel can be passed through Injector is in off state to deactivate gaseous fuel injection.Gaseous-fuel injector can be deactivated, until gas fuel tank quilt Supplement fuel.After gaseous fuel injection is deactivated, method 700 is exited.
By this method, method 700 can start via direct injector gaseous fuel injection, and via air intake duct or in Heart injector is changed into injection gaseous fuel.In addition, when the pressure in gaseous fuel storage fuel tank is less than threshold fuel case pressure When power, method 700 can deactivate all gas fuel injector.In this way, it is possible to adjust engine and gaseous fuel injection Device operation, to reduce amount of pressure and gaseous fuel quantity in gaseous fuel storage fuel tank.
Therefore, the method for Fig. 7 provides a kind of method for emptying fuel tank, it includes: when the pressure of gaseous fuel When greater than threshold tank pressure, gaseous fuel only is supplied to engine；And when the pressure of gaseous fuel is less than threshold fuel When case pressure, gaseous fuel and liquid fuel are supplied.By this method, when from gaseous fuel storage fuel tank in extract additional gas out When body, engine can continue to run and provide torque.This method also includes, when motor intake manifold pressure is greater than environment pressure When power, the fuel injector supplied with gaseous fuel is deactivated.
In another example, this method also includes, when the pressure of gaseous fuel is generally at environmental pressure, deactivate with The fuel injector of gaseous fuel supply.This method further includes, wherein being fired gas with the fuel injector that gaseous fuel is supplied Material is ejected into inlet manifold.This method includes that wherein the pressure of gaseous fuel is to store the pressure of the gaseous fuel in fuel tank Power.This method further includes that wherein the pressure of gaseous fuel is the gaseous fuel in the channel stored between fuel tank and engine Pressure.
In another example, the method for Fig. 7 provides a kind of method for emptying fuel tank, it includes: via fuel Case supplies gaseous fuel to engine；When the pressure of gaseous fuel is greater than first threshold fuel tank pressure, in the first case Run engine with gaseous fuel and the first valve timing；And when the pressure of gaseous fuel is less than first threshold fuel tank pressure When power, operate engine with gaseous fuel and duaspiracle timing.In this manner it is possible to adjust inlet valve Thus timing causes to store the flowing of fuel tank to engine from gas to increase the vacuum capacity in cylinder.
This method includes, wherein the first situation is engine speed and load.This method further includes, wherein with inlet valve is worked as It opens and compares when the pressure of gaseous fuel is greater than first threshold fuel tank pressure, the inlet valve of engine is fired relative to when gas Crank position is more behindhand opened when the pressure of material is less than first threshold fuel tank pressure.This method also includes, when gaseous fuel When pressure is less than first threshold fuel tank pressure, gaseous fuel is sprayed to the vapour of engine during the suction stroke of cylinder Cylinder.This method also includes, when the pressure of gaseous fuel is greater than first threshold fuel tank pressure, during the compression travel of cylinder Gaseous fuel is sprayed to the cylinder of engine.This method also includes directly to be ejected into gaseous fuel via injector and start In the cylinder of machine, and the inactive injector when the pressure in fuel tank is in environmental pressure substantially.
In another example, the method for Fig. 7 provides a kind of method for emptying fuel tank, it includes: via fuel Case supplies gaseous fuel to engine；When the pressure of gaseous fuel is greater than first threshold fuel tank pressure, make engine with the The operation of one gaseous-fuel injector；And when the pressure of gaseous fuel be less than first threshold fuel tank pressure when, make engine with The operation of second gas fuel injector.This method includes that wherein gaseous fuel is directly ejected by first gas fuel injector In cylinder, and gaseous fuel is ejected into inlet manifold by second gas fuel injector.This method further includes, wherein working as gas When the pressure of fuel is less than first threshold fuel tank pressure, first gas fuel injector is deactivated.This method further includes, wherein when When the pressure of gaseous fuel is essentially environmental pressure, second gas fuel injector is deactivated.
In another example, this method also includes and, when the pressure of gaseous fuel is less than second threshold fuel tank pressure, swashs Liquid fuel injector living.This method also includes, in response to the output of lambda sensor, by adjusting the spray of liquid fuel injector Timing is penetrated to adjust engine air-fuel ratio.This method also includes, in response to be activated in first gas fuel injector and second The pressure of gaseous fuel when gaseous-fuel injector is not activated postpones the opening timing of the inlet valve of engine.This method It also include, when the pressure of inlet manifold is greater than environmental pressure, to deactivate second gas fuel injector.Although some example descriptions Injection gaseous fuel, it is to be understood that, it can also spray other gases not comprising fuel, it is such as described herein.
Terminate this specification herein.Those skilled in the art read this specification and will be appreciated that without prejudice to spirit of the invention With many change and modification of range.For example, with natural gas, gasoline, diesel oil or alternative fuel configuration operation I3, I4, I5, V6, V8, V10 and V12 engine can use this specification to be benefited.

Claims (20)

1. a kind of management engine and fuel delivery system method comprising:
By one or more progress in gas fuel tank pressure and gaseous fuel rail pressure and gaseous fuel loine pressure Compare；
In response to one or more closing gas fuel tank valves of following condition: lower than the gas fuel pipe pressure of lower threshold Power and gas fuel tank pressure higher than upper limit threshold；And between the gaseous fuel rail pressure and pressure through adjusting Difference is more than second threshold；And
Fuels sources are switched to liquid fuel.
2. according to the method described in claim 1, wherein high pressure sensor is placed near gas fuel tank, described in measurement Gas fuel tank pressure.
3. according to the method described in claim 2, wherein the high pressure sensor is attached to the gas fuel tank.
4. according to the method described in claim 1, wherein measuring gas combustion in the channel between gas fuel tank and engine Expect pressure.
5. according to the method described in claim 4, wherein measuring the gas fuel pressure in gaseous fuel guide rail.
6. according to the method described in claim 4, wherein measuring the gas fuel pressure in gas fuel pipe.
7. according to the method described in claim 4, the wherein pressure in the channel between the gas fuel tank and engine The channel is divided into high-pressure area and area of low pressure by draught control mechanism.
8. according to the method described in claim 1, wherein at least one of the gaseous fuel guide rail and gas fuel pipe In low pressure and the gas fuel tank in high pressure indicate reveal.
9. according to the method described in claim 8, wherein in response in the gaseous fuel guide rail and gas fuel pipe extremely Leakage in one few, and close the fuel tank valve.
10. according to the method described in claim 9, wherein the fuel tank valve includes solenoid valve and mechanical flow limitation valve, institute It states solenoid valve and mechanical flow limitation response valve is closed in the leakage detected.
11. according to the method described in claim 10, wherein the mechanical flow limits valve from actuating, and in response to letting out Reveal and close, at least partly to limit the flow of the gas from the gas fuel tank.
12. being come according to the method described in claim 10, wherein the solenoid valve is closed in response to leakage with fully limiting From the flow of the gas of the gas fuel tank.
13. a kind of method for emptying fuel tank comprising:
When gas fuel tank pressure is high, fuel tank is emptied by only supplying gaseous fuel to engine, and works as the gas When fuel tank pressure is low, the gaseous fuel and liquid fuel are supplied；And
Low pressure and high fuel tank pressure in response to gas fuel tank valve downstream, by closing the gas fuel tank valve come override The emptying.
14. according to the method for claim 13, further comprising, when motor intake manifold pressure is greater than environmental pressure When, the fuel injector supplied with the gaseous fuel is deactivated, the override further comprises switching fuels sources.
15. according to the method for claim 14, further comprising, when the pressure of the gaseous fuel is in environment substantially When pressure, the fuel injector supplied with the gaseous fuel is deactivated.
16. according to the method for claim 15, wherein with the fuel injector of gaseous fuel supply by the gas In fuel injection to inlet manifold.
17. a kind of method for emptying fuel tank comprising:
Gaseous fuel is supplied to engine via fuel tank；
When the pressure of the gaseous fuel is greater than first threshold, make engine with the gaseous fuel directly sprayed and first Valve timing operation；
When the pressure of the gaseous fuel is less than the first threshold, the gas that sprays the engine directly Fluid fuel and duaspiracle timing operation；And
It is greater than threshold value based on the difference between gas fuel tank pressure and gas rail pressure, is supplied described in override, wherein the gas Fluid fuel case pressure is greater than the gas rail pressure.
18. according to the method for claim 17, wherein the override includes closing gas fuel tank valve, the gaseous fuel Case pressure is based on gas fuel tank pressure sensor.
19. according to the method for claim 17, wherein being greater than first threshold with the pressure when the gaseous fuel Inlet valve opening time is compared when value, the engine when the pressure of the gaseous fuel is less than the first threshold Inlet valve is more behindhand opened relative to crank position.
20. according to the method for claim 17, further comprising, when the pressure of the gaseous fuel is less than described When first threshold, the gaseous fuel is sprayed to the vapour of the engine during the suction stroke of the cylinder of the engine Cylinder.
CN201410098727.8A 2013-03-15 2014-03-17 System and method for closing fuel tank valve Active CN104047739B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/841,935 2013-03-15
US13/841,935 US9422900B2 (en) 2012-03-27 2013-03-15 System and method for closing a tank valve

Publications (2)

Publication Number Publication Date
CN104047739A CN104047739A (en) 2014-09-17
CN104047739B true CN104047739B (en) 2019-03-15

Family

ID=51419342

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410098727.8A Active CN104047739B (en) 2013-03-15 2014-03-17 System and method for closing fuel tank valve

Country Status (3)

Country Link
CN (1) CN104047739B (en)
DE (1) DE102014204822A1 (en)
RU (1) RU2638899C2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9803592B2 (en) * 2015-06-03 2017-10-31 Ford Global Technologies, Llc Fuel vapor blocking valve control
DE102016118976A1 (en) * 2016-10-06 2018-04-12 Man Diesel & Turbo Se Method for starting preparation and preferably for the subsequent starting of a designed as a gas engine or dual-fuel engine internal combustion engine
WO2018072839A1 (en) 2016-10-21 2018-04-26 Volvo Truck Corporation A gas tank arrangement
FR3082465B1 (en) * 2018-06-18 2020-06-05 Continental Automotive France METHOD FOR DETECTING A PINCH OR A TORSION OF A DRAIN PIPE
DE102018210998A1 (en) * 2018-07-04 2020-01-09 Robert Bosch Gmbh Fuel delivery device for cryogenic fuels
DE102018211924A1 (en) * 2018-07-18 2020-01-23 Robert Bosch Gmbh Fuel delivery device for cryogenic fuels
EP3833572B1 (en) * 2018-08-10 2023-03-29 Carrier Corporation Crash detection system for transport refrigeration units
CN111156098A (en) * 2019-12-31 2020-05-15 潍柴动力股份有限公司 Engine leakage detection method, detection device and detection system
CN111765014B (en) * 2020-06-30 2022-10-25 潍柴重机股份有限公司 Method and system for monitoring leakage of high-pressure fuel system

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0718484B1 (en) * 1994-12-22 1999-05-12 Siemens Aktiengesellschaft Arrangement for operating an internal combustion engine with different fuels
US6314948B1 (en) 1998-08-21 2001-11-13 Obital Engine Company (Australia) Pty Limited Fuel injection system control method
JP3432458B2 (en) * 1999-07-30 2003-08-04 富士通テン株式会社 Gas leak detection and fail-safe control method and apparatus for gas fueled internal combustion engine
DE102004040706B4 (en) * 2004-08-19 2010-05-06 Audi Ag Method for diagnosing the fuel supply system of an internal combustion engine
DE102004060905A1 (en) * 2004-12-17 2006-06-29 Robert Bosch Gmbh Method for controlling an internal combustion engine to which a gaseous fuel is supplied and apparatus for reducing the pressure of a gas
JP4131419B2 (en) * 2006-01-26 2008-08-13 株式会社デンソー Gas engine fuel leak detection device
DE102006022801A1 (en) * 2006-05-16 2007-11-22 Robert Bosch Gmbh Device and method for controlling an internal combustion engine
US7367312B1 (en) * 2006-11-29 2008-05-06 Ford Global Technologies, Llc Control strategy to better usage of fuel in gaseous engine
CN102076938B (en) * 2008-06-30 2014-11-26 奥比托澳大利亚有限公司 Gaseous fuel injection system for engines
RU88397U1 (en) * 2009-06-15 2009-11-10 Государственное образовательное учреждение высшего профессионального образования Омский государственный университет путей сообщения BATTERY SYSTEM OF GAS-DIESEL FUEL SUPPLY TO ENGINE CYLINDERS
WO2012086211A1 (en) * 2010-12-24 2012-06-28 川崎重工業株式会社 Gas fuel leakage detection method, and gas fuel leakage detection device, and gas engine equipped with same
US8855898B2 (en) * 2011-04-29 2014-10-07 GM Global Technology Operations LLC Systems and methods to diagnose valve leakage in a vehicle

Also Published As

Publication number Publication date
DE102014204822A1 (en) 2014-09-18
CN104047739A (en) 2014-09-17
RU2638899C2 (en) 2017-12-18
RU2014109784A (en) 2015-09-20

Similar Documents

Publication Publication Date Title
CN104047739B (en) System and method for closing fuel tank valve
US9422900B2 (en) System and method for closing a tank valve
CN103362659B (en) System and method for emptying tank body
CN101963113B (en) Engine and control method thereof
CN104564393B (en) For filling gasoline with the vehicle of CNG fuel combination using strategy
CN101592103B (en) On-board water addition for fuel separation system
CN100373037C (en) Common rail fuel injection system
CN101302965B (en) Method for recognizing a fuel type in a diesel engine
CN103821626B (en) Fuel system diagnostics
CN103670740B (en) For the method for fuel system diagnostics
CN204253232U (en) Fuel storage system
RU2653718C2 (en) Engine operation method (versions)
CN104110328B (en) Enhancing fuel injection based on blockage speed rate
CN103711615B (en) The motor-driven vavuum pump of engine-cooling system
CN106368840A (en) Method for operating a fuel injection system
CN104421015B (en) Increase the method for liquid fuel heat resistance for adjusting fuel composition
CN204458139U (en) Fuel system
KR102328097B1 (en) Internal combustion engine with starting air system
CN107299864A (en) System and method for reducing microparticle matter exhaust
CN110017215A (en) System and method for air inlet oxygen sensor diagnostic
CN106468232A (en) Method for operating double lifting pumping systems
CN104290736B (en) For reducing the method and system that vacuum consumes in vehicle
US10655515B2 (en) Blow-by gas recirculation device for internal combustion engine
CN107781065A (en) Fuel system, internal-combustion engine system and the method that LPG fuel is supplied to internal combustion engine
EP2740918B1 (en) Method and control system for a dual fuel engine

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant