CN101506506B - Method and apparatus for supplying fuel of LPG car having LPI system - Google Patents
Method and apparatus for supplying fuel of LPG car having LPI system Download PDFInfo
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- CN101506506B CN101506506B CN2007800266183A CN200780026618A CN101506506B CN 101506506 B CN101506506 B CN 101506506B CN 2007800266183 A CN2007800266183 A CN 2007800266183A CN 200780026618 A CN200780026618 A CN 200780026618A CN 101506506 B CN101506506 B CN 101506506B
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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
- F02D19/02—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 gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/024—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
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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
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/061—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
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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
- F02D19/0626—Measuring or estimating parameters related to the fuel supply system
- F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
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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]
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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
- F02D19/0663—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
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- 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
- F02M21/0251—Details of actuators therefor
- F02M21/0254—Electric actuators, e.g. solenoid or piezoelectric
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- 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
- F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
- F02M21/026—Lift valves, i.e. stem operated valves
- F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Disclosed is method and apparatus for supplying fuel of LPG car having LPI system. More particularly, the present invention generates a gas fuel injection signal based on a gasoline fuel injection signal and directly injects LPG fuel within a fuel tank to a combustion chamber using the generated gas fuel injection signal to drive an engine. Therefore, an engine can be easily changed, the manufacturing cost of a duel car of LPG and gasoline can be reduced, and the manufacturing process thereof can be simplified.
Description
Technical field
The present invention relates to a kind of liquefied petroleum gas (LPG) (LPG) automobile with liquefied petroleum gas (LPG) injection (LPI) system that is used to the method and apparatus of fuel is provided, and relate in particular to a kind of method and apparatus that is used to provide fuel, wherein engine is driven by LPG.
Background technique
Because liquefied petroleum gas (LPG) (LPG) has high-octane rating, thermal resistance and cheap price preferably, so LPG and gasoline one are used from automotive fuel.
The LPG that offers car engine is liquid.When the LPG of liquid state is vaporized, thereby fuel and air can mix easily and can improve flammability.In other words, compare with gasoline that is used for the general-utility car engine or light oil, LPG can prevent frequent pinking and the phenomenon of elimination such as vapour locking and seepage (percolation).Therefore, the application area of LPG has increased a kind of replaceable fuel for gasoline or diesel oil.
The device of a kind of LPG of providing offers air injector by using petrolift with the LPG of liquid state, and LPG is injected in the cylinder by described air injector, and injected LPG and air mixing, to be vaporized.
The dual-fuel automobile of use LPG and gasoline needs vaporizer (vaporizer), mixer and LPG fuel machine for storing (bomber), solenoid valve in essence and is used to control the LPG engine control unit of described solenoid valve.
Because above basic structure uses the manufacture cost of the dual-fuel automobile of LPG and gasoline to increase to some extent, and manufacture process wherein also becomes complicated more.
Summary of the invention
The present invention is provided to be used for solving the foregoing problems that prior art exists.Target of the present invention provides a kind of method and apparatus that is used to the LPG automobile with LPI system that fuel is provided, described LPI system injects signal based on Fuel Petroleum and produces gaseous fuel and inject signal, and use the gaseous fuel injection signal that is produced directly the LPG fuel of fuel tank to be injected into the firing chamber, driving engine, thus design engine or change design easily, reduce the cost of automobile making and simplify its manufacture process easily.
In order to realize target of the present invention from first viewpoint, a kind of equipment that is used for providing to liquefied petroleum gas (LPG) (LPG) automobile with liquefied petroleum gas (LPG) injection (LPI) system gasoline and LP gas fuel has been proposed, described LPI system adopts direct LPG injecting scheme, described equipment comprises: be formed at a plurality of injection syringes at intake manifold place, be used in cylinder injecting Fuel Petroleum and LPG fuel one to drive engine; The gasoline engine control unit, the result who be used for receiving from the outside engine load situation, compares according to the injection length of described Fuel Petroleum with the engine load situation that receives generates Fuel Petroleum and injects signal, is used to control the temporal information of described a plurality of injection syringes and generates the pulse signal that is used to control described a plurality of injection syringes based on described temporal information based on providing to calculate from the engine speed information of outside and proportionality constant information; Be connected to the LPG engine control unit of described gasoline engine control unit, be used to receive according to the injection length of described Fuel Petroleum and predetermined data information, be formed at the petrolift in the LPG fuel tank and described predetermined data information compensated so that described predetermined data information is inversely proportional to the fuel pressures of discharging from described LPG fuel tank by driving, when being provided by the data information that compensated, calculating and the corresponding described proportionality constant information of fuel injection length described LPG fuel, provide the proportionality constant that calculates information to described gasoline engine control unit, and reception provides the pulse signal from described gasoline engine control unit to inject signal and this gaseous fuel injection signal is offered described a plurality of injection syringe with the gaseous fuel that described signal conversion is become to be used to drive described a plurality of injection syringes; And LPG engine, be used for providing described LPG fuel so that described LPG fuel mixes with providing from air outside to described intake manifold, LPG fuel in the described LPG fuel tank is discharged by driven petrolift under the control of described LPG engine control unit, and described LPG engine injects mixed LPG fuel by described injection syringe to described cylinder and returns to described LPG fuel tank with the fuel that drives described engine and will remain in described a plurality of injection syringes.
The engine load situation of described gasoline engine control unit can be calculated according to one in air inflow information, throttle valve position information and the intake manifold pressure information.
Described engine speed information can be one in car speed information, crank shaft information and the camshaft location information.
Described gasoline engine control unit and described LPG engine control unit can be integrally formed mutually.
Described LPG engine control unit can also comprise communication module, this communication module can be carried out controller territory network (CAN) communication, also receives the described pulse signal that provides from described gasoline engine control unit so that the described proportionality constant information that provides from described LPG engine control unit to be provided to described gasoline engine control unit.
Described LPG engine control unit can also comprise display modular, this display modular is connected to described gasoline engine control unit, and the described LPG engine control unit from described CAN communication module to driver notice that provided by and the communication information between the described gasoline engine control unit are provided this display modular.The described communication information can be by the detected fault message of described LPG engine control unit.
The pressure of liquid LPG gas can be than the fuel pressure in the described fuel tank powerful 5Bar.
Described LPG engine control unit can also comprise the petrolift driver that is used to drive described petrolift.
Described LPG engine control unit can be stored peak time, retention time information and saturation time information, described peak time and retention time information are the driving times of described injection syringe, described saturation time information is used under the situation that crystalline polamer takes place based on providing external air temperature and cooling water temperature from described gasoline engine control unit to eliminate described crystalline polamer, described LPG engine control unit can also be used for the injection syringe control command of basis programming in advance when satisfying the condition that produces crystalline polamer and export the saturation signal that is used to provide described saturation time, and described LPG engine control unit can also be used for exporting peak value and the inhibit signal that is used to provide described peak time and retention time when not satisfying the condition that produces crystalline polamer.
In other words, if described crystalline polamer takes place in the end of described injection syringe, then described LPG engine control unit can be based on providing from outside external air temperature and cooling water temperature, export described saturation signal, if and described crystalline polamer takes place in the end of injection syringe, then described LPG engine control unit can be exported described peak value and inhibit signal.
Described saturation signal can have the interval of increasing and keep the interval, and electric current increases to provide predetermined voltage to described injection syringe in described increase interval.
Described peak value and inhibit signal can comprise be used to provide the peak signal of peak time and corresponding to the pulse duration modulation inhibit signal of keeping the driving of described injection syringe during the retention time, described peak time is the initial driving time of described injection syringe, and the described retention time is that the driving of described injection syringe is held time.
Each injection syringe in described a plurality of injection syringe can comprise: output driver, when described engine during by initial driving, described output driver is connected to the output terminal of described LPG engine control unit so that one in peak value and inhibit signal and the saturation signal to be provided to corresponding injection syringe; And the current probe part, be used to detect the output current of corresponding injection syringe and export the injection syringe current information to provide electric current to described LPG engine control unit.
Described current probe part can be monitored described injection syringe current information and be controlled the electric current that offers corresponding injection syringe according to monitoring result during described peak time.
Described current probe part can comprise: current probe is used to detect the electric current of described output driver so that electric current is exported with the form of voltage; And comparator, be used for the output voltage and the predetermined reference voltage of described current probe are compared, and export described injection syringe current information according to comparative result.
Rating unit can comprise comparator, this comparator is used for when the output voltage of described current probe is equal to or greater than described reference voltage output and has other injection syringe current information of low potential level, and output had other injection syringe current information of high potential level when described comparator also was used for output voltage at described current probe less than described reference voltage.
Rating unit can also comprise comparator, this comparator is used for when the output voltage of described current probe is equal to or less than described reference voltage output and has other injection syringe current information of high potential level, and output had other injection syringe current information of low potential level when described comparator also was used for output voltage at described current probe greater than described reference voltage.
Corresponding injection syringe also comprises the cut-off valve of injection syringe, this cut-off valve is formed on the fuel channel between piston and the nozzle, and this cut-off valve is used for blocking the fuel channel between described piston and the described nozzle when start key cuts out, described piston is used to open and close the fuel channel between import and the described nozzle, described piston is raised by electromagnet coil or falls, and fuel flows into described import and is injected into by described nozzle.
If the actuating signal that receives is to open, then described LPG engine control unit can be based on providing crank shaft information and camshaft location information from described gasoline engine control unit to determine whether described engine is driven, if and determined that described engine is driven, then described LPG engine control unit would receive the time that the engine status information of described gasoline engine control unit is opened with the cut-off valve that changes the described injection syringe of control.
In other words, if detect first effective gear by described crank shaft information and described camshaft location information, the time that the engine status information that then described LPG engine control unit can receive described gasoline engine control unit is opened with the cut-off valve that changes the described injection syringe of control.
Described engine status information can be that fuel temperature information, fuel inject one or more of status information, engine rotation information, battery voltage information and CAN communicate status information.
If the fuel temperature information that oneself outside is provided is more than or equal to predetermined value, then described LPG engine control unit can be controlled the cut-off valve of described injection syringe and open after through first scheduled time.
If described a plurality of injection syringe injects status information and is confirmed as just injecting LPG fuel based on fuel, then described LPG engine control unit can be controlled the cut-off valve of described injection syringe and open after through second scheduled time.
If described engine is confirmed as being rotated based on the engine rotation information, then described LPG engine control unit can be controlled the cut-off valve of described injection syringe and open after through the 3rd scheduled time.
If cell voltage is confirmed as being less than or equal to predetermined set value based on battery information, then described LPG engine control unit can be controlled the cut-off valve of described injection syringe and open after through the 4th scheduled time.
If it is wrong that the CAN communication line is confirmed as based on the CAN communicate status information, then described LPG engine control unit can be controlled the cut-off valve of described injection syringe and open after through the 5th scheduled time.
Described predetermined value can be 50 ℃, described first scheduled time can be 100msec, described second scheduled time can be 0msec, described the 3rd scheduled time can be 50msec, described predetermined set value can be 8volt, described the 4th scheduled time can be 100msec, and described the 5th scheduled time can be 500msec.
In order to realize target of the present invention from second viewpoint, a kind of method that is used for providing to the LPG automobile with LPI system fuel has been proposed, this method comprises the following steps: that (a) receives engine load situation by providing from outside throttle valve position information and intake manifold input information, and the result that will compare with the engine load that receives situation according to the Fuel Petroleum injection length and predetermined data information is sent to the LPG engine control unit; (b) described LPG engine control unit receives according to described Fuel Petroleum injection length and predetermined data information, be formed at the petrolift in the LPG fuel tank and described predetermined data information compensated so that described predetermined data information is inversely proportional to the fuel pressures of discharging from described LPG fuel tank by driving, when being provided by the data information that compensated, calculating and the corresponding proportionality constant information of fuel injection length described LPG fuel, and provide the proportionality constant that calculates information to described gasoline engine control unit; (c) the gasoline engine control unit is used to control the pulse signal of described a plurality of injection syringes described pulse signal is sent to described LPG engine control unit based on providing to calculate to be used to control the temporal information of a plurality of injection syringes and to generate based on described temporal information from outside engine speed information, Fuel Petroleum injection length information in the step (a) and the proportionality constant information in the step (b); (d) described LPG engine control unit the pulse signal that provides from described gasoline engine control unit is provided also this gaseous fuel injection signal is offered described a plurality of injection syringe with the gaseous fuel injection signal that described signal conversion is become to be used to drive described a plurality of injection syringes; And (e) provide described LPG fuel so that described LPG fuel mixes with providing from air outside to described intake manifold, LPG fuel in the described LPG fuel tank is discharged by driven petrolift under the control of described LPG engine control unit, injects mixed LPG fuel by described injection syringe to cylinder and returns to described LPG fuel tank with the fuel that drives described engine and will remain in described a plurality of injection syringes.
Described engine load situation can be calculated according to one in air inflow information, throttle valve position information and the intake manifold pressure information.
Engine speed can be one in car speed information, crank shaft information and the camshaft location information.
CAN communication can be performed so that the described proportionality constant information that provides from described LPG engine control unit to be provided to described gasoline engine control unit the described pulse signal that provides from described gasoline engine control unit also is provided.
This method can also comprise the following steps: that the described LPG engine control unit that provided by the CAN communication module and the communication information between the described gasoline engine control unit are provided (f).The described communication information can be by the detected fault message of described LPG engine control unit.
The pressure of liquid LPG gas can be than the fuel pressure in the described fuel tank powerful 5Bar.
Step (d) can determine whether the condition that produces crystalline polamer in the end of described a plurality of injection syringes is satisfied based on providing from outside external air temperature and cooling water temperature, and respectively, if producing the condition of described crystalline polamer is satisfied, then can will have the saturation signal of saturation time information of the crystalline polamer that is used to eliminate described a plurality of injection syringes place with the form output of continuous signal, if and the condition that produces described crystalline polamer is not satisfied, then peak value and inhibit signal with peak time and retention time information can be exported with the form of continuous signal, described peak time and retention time information are the driving times of described a plurality of injection syringes.
Step (d) can comprise the following steps: that (d-1) determines based on providing from outside external air temperature and cooling water temperature whether the condition that produces crystalline polamer in the end of described a plurality of injection syringes is satisfied; (d-2) if the result of step (d-1), then will have the saturation signal of saturation time information of the crystalline polamer that is used to eliminate described a plurality of injection syringes place for the condition that produces described crystalline polamer is satisfied with the form output of continuous signal; (d-3), then be provided at the peak signal that provides during the described peak time and the pulse duration modulation inhibit signal during the described retention time to described a plurality of injection syringes according to the injection syringe control command of programming in advance if the result of step (d-1) is not satisfied for the condition that produces described crystalline polamer.
Step (d) can also comprise the following steps: that (d-4) detects the output current of described a plurality of injection syringes with output injection syringe current information; And (d-5) receive described injection syringe current information with the described injection syringe current information of monitoring during described peak time, and control the electric current that is provided to described a plurality of injection syringes according to monitoring result from described LPG engine control unit.
Output had other injection syringe current information of low potential level when step (d-5) can be equal to or greater than reference voltage at the output voltage of described current probe, and the output voltage of described current probe during less than described reference voltage output have other injection syringe current information of high potential level.
Output had other injection syringe current information of high potential level when step (d-5) can be equal to or less than reference voltage at the output voltage of described current probe, and the output voltage of described current probe during greater than described reference voltage output have other injection syringe current information of low potential level.
Step (e) can receive the engine status information of described gasoline engine control unit and change the time that the cut-off valve be used to control described injection syringe is opened, and the fuel than the connecting path between lower part and the nozzle of the cut-off valve control piston of described injection syringe injects and fuel blocks.
Described engine status information can be that fuel temperature information, fuel inject one or more of status information, engine rotation information, battery voltage information and CAN communicate status information.
Step (e) can also comprise the following steps: that (e-1) receives crank shaft information and camshaft location information from the outside, determine whether the crank shaft information and the camshaft location information that receive is normal, if and the result who determines is normal for described crank shaft information and camshaft location information, determine then whether described engine just is being driven; And if (e-2) described engine just is driven, then determine whether to detect the effective gear signal of crank based on described crank shaft information and camshaft location information, if and the result who determines is the effective gear signal that detects described crank, then receives engine status information and open with the cut-off valve of controlling described injection syringe from the outside.
Step (e-2) can comprise the following steps: (e-2A) if the fuel temperature information that oneself outside is provided more than or equal to predetermined value, is then opened through the cut-off valve of controlling described injection syringe after first scheduled time; (e-2A) if described a plurality of injection syringe injects status information and is confirmed as just injecting LPG fuel based on fuel, then open through the cut-off valve of controlling described injection syringe after second scheduled time; (e-2C), then open through the cut-off valve of controlling described injection syringe after the 3rd scheduled time if described engine is confirmed as being rotated based on the engine rotation information; (e-2D), then open through the cut-off valve of controlling described injection syringe after the 4th scheduled time if cell voltage is confirmed as being less than or equal to predetermined set value based on battery information; (e-2E) wrong if the CAN communication line is confirmed as based on the CAN communicate status information, then open through the cut-off valve of controlling described injection syringe after the 5th scheduled time.
The predetermined value of described fuel temperature information can be 50 ℃, described first scheduled time can be 500msec, described second scheduled time can be 0msec, described the 3rd scheduled time can be 50msec, the described predetermined set value of cell voltage can be 8volt, described the 4th scheduled time can be 100msec, and described the 5th scheduled time can be 500msec.
The present invention is based on Fuel Petroleum injection signal produces gaseous fuel injection signal and uses the gaseous fuel injection signal that is produced directly the LPG fuel of fuel tank to be injected into the firing chamber to drive engine.Therefore, engine can be changed easily, use the manufacture cost of the dual-fuel automobile of LPG and gasoline to be reduced, and manufacture process wherein can be simplified.
Description of drawings
Describe definite mode of execution of the present invention in conjunction with the drawings and can make above-mentioned viewpoint of the present invention and feature more obvious, wherein:
Fig. 1 is the view according to the dual-fuel automobile of use gasoline of one embodiment of the present invention and LPG;
Fig. 2 is the gasoline engine control unit described among Fig. 1 and the block diagram of LPG engine control unit;
Fig. 3 is the block diagram of the injection syringe driver described among Fig. 2;
Fig. 4 is used for explaining that the described LPG engine control unit of describing by Fig. 2 exports the flow chart that gaseous fuel injects the process of signal;
Fig. 5 is the circuit diagram of the current probe described among Fig. 3;
Fig. 6 is the waveform of the saturation signal of the LPG engine control unit described among Fig. 4;
Fig. 7 is the peak value of the LPG engine control unit described among Fig. 4 and the waveform of inhibit signal;
Fig. 8 has illustrated the example of the injection syringe of describing among Fig. 3;
Fig. 9 is the flow chart that comes the example of process that the cut-off valve of injection syringe is controlled by the LPG engine control unit of describing among Fig. 1.
Embodiment
Illustrative embodiments of the present invention will be described specifically with reference to the accompanying drawings.
Fig. 1 be according to the embodiment of the present invention use gasoline and the view of the double fuel engine driving equipment of LPG, Fig. 2 shows the block diagram of the operating process of the gasoline engine control unit described among Fig. 1 and LPG engine control unit.
Referring to Fig. 1 and Fig. 2, the double fuel engine driving equipment of use gasoline according to the embodiment of the present invention and LPG comprises petrolift 109, pressure controller 115, fuel tank 107, gasoline engine control unit 103 and engine control unit 105.Petrolift 109 is connected to the supply circuit of fuel rail, so that provide liquefied fuel to injector section 117, described injector section 117 invests on the intake manifold 119 and has a plurality of injection syringes.Pressure controller 115 is connected to the return line 111 of described fuel rail.Described fuel tank 107 has described petrolift 109.Described gasoline engine control unit 103 is carried out Fuel Petroleum control.Described LPG engine control unit 105 is controlled the supply of liquid LPG based on the operation signal of described gasoline engine control unit 103.
In this embodiment, described gasoline engine control unit 103 and described LPG engine control unit 105 are provided respectively, but described gasoline engine control unit 103 can be integrally formed with described LPG engine control unit 105.
The pressure values and the throttle valve position value of the described intake manifold that is provided with in the air filter of described gasoline engine control unit 103 according to automobile are calculated charge volume, so that computing engines load state information, and, calculate described gasoline engine based on predetermined data information and inject the needed time of fuel than the engine load situation of being calculated.
The information that calculates offers described LPG engine control unit 105 by CAN communication module 217.
In addition, described gasoline engine control unit 103 detects the engine speed of automobile, promptly depends on the engine speed of the quantity of fuel of being injected.Here, the described engine speed of automobile is calculated based on crank angle sensor, cam sensor and car speed information.
Described gasoline engine control unit 103 produces pulse signal to drive each injection syringe of described injector section 117 according to the information based on the input signal programming, and wherein said input signal is the input signal of pneumatic sensor, intake air temperature sensor, clear position switch, TDC sensor and crank angle sensor.
The fuel pressures sensor of described LPG engine control unit 105 by automobile detects the power that is directly proportional with fuel pressures in the described fuel tank 107, to produce and the signal that provides the information of time to be inversely proportional to about the fuel that obtains from described gasoline engine control unit 103.
The described signal that is inversely proportional to is used for by the pressure in the LPG of automobile fuel tank 107 reducing when very big and injects required time of fuel and the pressure the LPG of automobile fuel tank 107 in and increase the injection required time of fuel when very little and provide quantitative fuel to described injector section 117.
Because aforesaid operations is equally applicable to gasoline, so described operation information also can use when using gasoline.
Described LPG engine control unit 105 calculates the correction factor that the injection amount of described Fuel Petroleum is compared with the injection amount of described liquid gas fuel based on the result of described operation information.
In other words, make that by the proportionality constant that calculates the Fuel Petroleum injection amount injection amount of Fuel Petroleum is identical with the injection amount of described liquid gas fuel, and the result who calculates is provided for described gasoline engine control unit 103.
Described gasoline engine control unit 103 is provided with the dutycycle (duty) of pulse signal and controls described injector section 117.
The duty cycle signals of the pulse signal of described gasoline engine control unit 103 is provided for described LPG engine control unit 105, and described LPG engine control unit 105 with duty cycle information of received pulse information is controlled the supply of fuel of described injector section 117 by the output driver (not shown) according to the duty cycle signals of described pulse signal.
Thereby, the fuel that gasoline engine control unit 103 produces gasoline engine injects signal, LPG engine control unit 105 receives fuel from gasoline engine control unit 103 and injects control signals, to control based on the fuel pressures information of petrolift 109 quantity to the liquid LPG fuel that offers described injector section 117.
LPG engine control unit 105 also comprises communication module 217, this communication module 217 can be communicated by letter by implementation controller Local Area Network (CAN), interactive communication between the pulse signal that provides with the proportionality constant information that realizes providing from LPG engine control unit 105 with from gasoline engine control unit 103, LPG engine control unit 105 also comprises display modular 219, and this display modular 219 is connected to gasoline engine control unit 103 and notifies the driver with the LPG engine control unit 105 that will be provided by communication module 217 and the communication information between the gasoline engine control unit 103.The described communication information comprises the fault message of LPG engine control unit 105.
LPG engine control unit 105 also comprises the petrolift driver 219 that is used for the driving fuel pump.
The process that gasoline engine produces fuel injection signal and gaseous fuel injection signal will describe in detail hereinafter.
Gasoline engine control unit 103 comprises engine load computing module 151, car speed information calculations module 153, injection length computing module 201, engine speed computing module 203, injection syringe control module 205, pulse signal generation module 207 and is used to carry out the communication module 217 of communicating by letter with the CAN of described LPG engine control unit 105.
Described LPG engine control unit 105 comprises fuel pressures computing module 209, operational module 211, proportionality constant computing module 213 and injection syringe driver 215, and described LPG engine control unit 105 can be carried out CAN communication, the interactive communication between the pulse signal that provides with the proportionality constant information that realizes providing from described LPG engine control unit 105 with from described gasoline engine control unit 103.
Engine load computing module 151 is based on described intake manifold pressure values and the described engine load condition information of described throttle valve position information calculations, and the injection length computing module 201 with received described engine load situation that calculates receives predetermined data information as digital signal, this numerical information is according to received engine load condition information and engine speed increment and scheduled, described engine speed increment is calculated by described car speed information calculations module 153 by described engine speed computing module 203, thereby described injection length computing module 201 is based on calculating the gasoline injection length according to the predetermined data information of described engine speed increment.
Detect the car speed information of described car speed information calculations module 153 by vehicle speed sensor.In this mode of execution of the present invention, the car speed information calculations that obtains according to described vehicle speed sensor goes out engine speed information, and crank position information and camshaft location information calculates but it also can be based on.
Described injection length information is offered described LPG engine control unit 105, and described LPG engine control unit 105 receives the engine speed information that the pressure information calculations in the based on fuel casees goes out, with compensation injection length information.
Above-mentioned compensation is carried out by operational module 211.As mentioned above, described injection length is set according to described LPG fuel tank pressure, and described injection length and fuel tank pressure are inversely proportional to.
In other words, use under the situation that above-mentioned injection length can not change in the reference value of the fuel pressures of described LPG fuel tank 107, if but the fuel pressures in the described LPG fuel tank 107 is than described reference value height, then described injection length can reduce with the difference of reference value and fuel pressures with being directly proportional, and perhaps described injection length also can increase inversely with the difference of reference value and fuel pressures.
That is to say that described injection length refers to the gasoline state.In order to set injection length, need the proportionality constant TI_FAC that gas injects be calculated, wherein said injection length can be applied to described injector section 117 by described proportionality constant computing module 213.
The figure that one width of cloth draws according to described proportionality constant TI_FAC is based on Bernoulli's equation, and is calculated as follows: proportionality constant TI_FAC=(reference pressure/current LPG pressure)
1/2
Described reference pressure is set as 10bar, and described proportionality constant setting when fore pressure and based on described reference pressure according to LPG fuel tank 107.
The aforementioned proportion constant is based on according to the result who compares with described reference pressure when fore pressure of LPG fuel and predetermined data information.Described proportionality constant value can be calculated by operation equipment, and the proportionality constant value of current LPG pressure can be used as predetermined data information.
In this embodiment, the result that the proportionality constant TI_FAC of LPG fuel compares with described injection length is set by described predetermined data information, and wherein this LPG fuel is liquid gas fuel.The proportionality constant TI_FAC information of described LPG fuel is provided for the injection syringe control module 205 of described gasoline engine control unit 103, and the injection length when described injection syringe control module 205 will be used gasoline multiply by the proportionality constant TI_FAC when using described liquid gas fuel, the injection length TI_INJ when using described liquid gas to calculate.
Gasoline engine control unit 103 is controlled described injection syringe by pulse signal generation module 207 output pulse signals with the injection length TI_INJ information based on described liquid gas.Described pulse signal generation module 207 is provided for the injection syringe driver 215 of described LPG engine control unit 105, and described injection syringe driver 215 compensates the pulse signal of current input at the drive signal of described air injector, described drive signal is offered described injector section 117.
Described CAN communication module 217 is used for mutual exchange message between described LPG engine control unit 105 and gasoline engine control unit 103.Gasoline engine control unit 103 is notified to the driver by described display modular 219 usefulness light with the fault message that passes through the described LPG engine control unit 105 in the described CAN communication module 217 mutual information that exchange between described LPG engine control unit 105 and the described gasoline engine control unit 103.
The drive signal of the air injector of described LPG engine control unit 105 comprises one in peak value and inhibit signal and the saturation signal.
Fig. 3 is the block diagram of the injection syringe driver 215 described among Fig. 2, Fig. 4 is used for explaining that the described LPG engine control unit output gaseous fuel of describing by Fig. 2 injects the flow chart of the process of signal, Fig. 5 is the circuit diagram of the current probe described among Fig. 3, Fig. 6 is the waveform of the saturation signal of the LPG engine control unit described among Fig. 4, and Fig. 7 is the peak value of the LPG engine control unit described among Fig. 4 and the waveform of inhibit signal.
Referring to Fig. 3, the number of injection syringe driver 215 is identical with the number of injector section 117 in being installed in automobile, and described injection syringe driver 215 comprises output driver part 215a, this output driver part 215a provide electric energy to described injection syringe 117a, provide LPG fuel with the drive signal according to described LPG engine control unit 105 to described injection syringe 117a, wherein said injection syringe 117a is made up of described injector section 117.
Described injection syringe driver 215 also comprises current probe part 215b, this current probe part 215b sets the drive signal of described injection syringe 117a according to the current information that offers described injection syringe 117a, and detect the electric current that offers described injection syringe 117a, to continue to provide the setting drive signal of described injection syringe to described output driver part 215a.
Referring to Fig. 5, described current probe part 215b comprises current probe 510, the electric current of these current probe 510 sensing output driver parts 300, thus export described electric current with the form of voltage.Described current probe part 215b also comprises rating unit 530, and described rating unit 530 compares the output voltage and the predetermined reference voltage Vref of described current probe 510, to export the injection syringe current information according to described comparative result.
Described rating unit 530 comprises comparator C omp, if the output voltage of wherein described current probe 510 is equal to or greater than described reference voltage Vref, then this comparator C omp output has other injection syringe current information of low potential level, if and the output voltage of described current probe 510 is less than described reference voltage Vref, then this comparator C omp output has other injection syringe current information of high potential level.
Here, described comparator C omp also comprises resonon R1 and R2 usually, fills it up with negative input voltage and output voltage.
In other words, described LPG engine control unit 105 storage saturation time information as shown in Figure 6, wherein in this saturation time, the electric current of described injection syringe 117a of flowing through increases at interval (a), described electric current also remains unchanged at interval (b), and determine based on the external air temperature and the cooling water temperature of the CAN communications reception by described gasoline engine control unit 103 whether crystalline polamer takes place in the end of described injector section 117, so that when crystalline polamer takes place, output offers the saturation signal of described saturation time information.
Subsequently, described LPG engine control unit 105 storage peak time information and retention time information, the initial driving time that described peak time information is described injector section 117, the driving that described retention time information is described injector section 117 is held time.The pulse-width modulation frequency information of described 105 described retention times of storage of LPG engine control unit is also remembered described peak time and retention time information, and it also has the modulation program that is used for pulse duration modulation and is used for controlling the peak time of each injection syringe and the control program of the driving of retention time.
By above-mentioned control program, described LPG engine control unit 105 provides peak signal and inhibit signal for the continuous running of engine cylinder.
In other words, shown in Fig. 7 (A), described LPG engine control unit 105 provides described peak signal and described inhibit signal continuously, with the cylinder of the described injector section 100 of continuous running.Described peak signal is to be used to use initial current to control the control signal that described cylinder is opened, and described inhibit signal is the control signal that is used for keeping the operation of described injection syringe behind initial current.
Like this, described LPG engine control unit 105 provides the peak signal of peak time and the inhibit signal of retention time is provided to described output driver part 215a output.
Peak time has unified time of being directly proportional with the described retention time at interval so that each injection syringe is carried out continuous control, and the described retention time have the identical time lag according to the module of injection syringe.
Peak signal and the time lag output of inhibit signal to grow as peak time, and described LPG engine control unit 105 produces pulse duration modulation (PWM) signal during the retention time shown in Fig. 7 (B).
Like this, the pulse width of pwm signal is determined according to the feature of described injection syringe, and promptly they are based on described injection syringe module and are designed.Thereby the pwm signal that provides during the retention time is provided for injection syringe, thereby can inject fuel.
In other words, LPG engine control unit 105 is exported peak signal during peak time, and described output driver 117b carries out predetermined electric power and amplifies driving described injection syringe 117a, thereby can electric energy be offered injection syringe by the pulse width of pwm signal.Peak value and inhibit signal are provided for described output driver part 215a.
The peak time of described peak value and inhibit signal has unified time of being directly proportional with the described retention time at interval so that each injection syringe is carried out continuous control, and the described retention time have the identical time lag according to the injection syringe module.
Based on above-mentioned feature, the operation of LPG engine control unit 105 will be by description below.
LPG engine control unit 105 determines based on external air temperature and cooling water temperature whether described crystalline polamer takes place at described injector section 117 places, if and generation crystalline polamer, then it will provide saturation signal to output driver part 215a, and if crystalline polamer does not take place, then it will provide peak value and inhibit signal.
Saturation signal is a control signal, in order to eliminate the crystalline polamer that produces in the end of injection syringe 117a by use initial current to injection syringe 117a, and as shown in Figure 6, they have increases interval (a) and keeps interval (b), wherein increasing interval (a), the current increases of injector section 117 of flowing through, thus reach predetermined grade.
Saturation time is to utilize predetermined current to produce heat at each end of the injection syringe of injector section 117, eliminating the crystalline polamer that produces in the end of injector section 117, and increase time and characteristic, cell voltage and the required fuel quantity of holding time according to the coil in the injection syringe 117a change.
For example, if injection syringe has the increase interval of 1.75msec, 8.25msec the resistance of keeping interval and 2ohm, then during a saturation time, at the heat that increases the interval 86mJ of generation, at the heat of keeping the interval 808mJ of generation, and if the injection signal is provided in a second 25 times, then always meet the heat that produces 22350mJ together.Crystalline polamer can be eliminated by above-mentioned heat.Here, be for 25 times under the common engine speed of hypothesis is the situation of 300rpm, to provide.
Shown in Fig. 7 (C), the injection syringe current information is detected by current probe part 215b and is provided for described LPG engine control unit 105, offers the electric current of injection syringe 117a when wherein being illustrated in the peak time end from output driver part 215a.LPG engine control unit 105 is determined the electric weight (electricityamount) of peak time based on the injection syringe current information of the current probe part 117c that is received.
In other words, the output current of described output driver part 215a is detected by described current probe 510, thereby exports with the form of voltage, and the output voltage of current probe 510 is provided to negative (-) utmost point of comparator C omp.
Shown in Fig. 7 (C), if the output voltage of current probe 510 is equal to or greater than the reference voltage Vref of just (+) utmost point of described comparator C omp, then described comparator C omp output has other injection syringe current information of low potential level, if the output voltage of current probe 510 is less than described reference voltage Vref, then described comparator C omp output has other injection syringe current information of high potential level.
Described injection syringe current information is provided for described LPG engine control unit 105, and LPG engine control unit 105 is controlled the electric weight that is provided to described injector section 107 according to the rank of injection syringe current information, to export peak signal and the inhibit signal with peak time and retention time according to described controlled electricity.Described peak signal and inhibit signal are amplified by output driver part 215a and offer injection syringe 117a, and described injection syringe 117a injects fuel by peak signal and the inhibit signal that peak time and retention time are provided.
Fig. 4 is the flow chart that is used for the control procedure of the LPG engine control unit 105 that interpretation maps 3 describes.At first, external air temperature and the cooling water temperature (step 601) that is provided by the outside is provided LPG engine control unit 105, it determines whether the condition that produces crystalline polamer at injection syringe 117a place is satisfied (step 603), and if crystalline polamer takes place, then it provides the saturation signal (step 605) of programming in advance.
If in step 603, the condition that produces crystalline polamer at injection syringe 117a place is not satisfied, then LPG engine control unit 105 produces peak value and the inhibit signal with peak time and retention time, described peak time is the initial driving time of described injection syringe, and the described retention time is hold time (step 607) that drives.
In other words, if in step 603, the condition that produces crystalline polamer at injection syringe 117a place is satisfied, and then the crystalline polamer of described injection syringe is eliminated by the saturation signal that saturation time is provided, and fuel can be injected by described peak value and inhibit signal subsequently.If in step 603, the condition that produces crystalline polamer at injection syringe 117a place is not satisfied, and then fuel is injected by the described peak value of peak value and retention time and the inhibit signal of providing.
Fig. 8 describes the injection syringe 117a that describes among Fig. 3 in detail.
Referring to Fig. 8, injection syringe 117a is inserted into and is installed in the relevant position of described intake manifold 119, and they line up a line on a fuel rail.
Each injection syringe 117a has electromagnet coil 1 and piston 2.If apply electric energy by described LPG engine control unit 105 to described electromagnet coil 1, then the magnetic force of Chan Shenging is mentioned described piston 2 from piston area (plunger sheet) 3, thereby the fuel that flows into import 4 can be injected into by nozzle 5.
When finishing car steering and stopping engine, the liquefied fuel that has flowed into import 4 still is retained in the injection syringe 117a, and because piston 2 and piston area 3 can not perfectly stop described fuel, residual fuel flows directly into described cylinder.
In order to stop fuel losses, the cut-off valve 20 of injection syringe is formed in the fuel channel between piston 2 and the nozzle 5, the fuel channel that wherein said piston 2 opens and closes between import and the nozzle, described piston is promoted by described electromagnet coil or falls, and fuel flows into from described import, and when start key cut out, fuel injected from described nozzle.
The cut-off valve 20 of injection syringe is formed at the centre of described injection syringe 117a axial direction.This means the fuel channel in the axial direction of injection syringe 117a forms the cut-off valve 20 of injection syringe, with the lower extreme point of connection piston 2 and the upper extreme point of nozzle 5, and the piston 24 of the cut-off valve 20 of injection syringe is raised in connecting path or falls at the axial direction of injection syringe 10, so that open or close described fuel channel, wherein said axial direction is the Vertical direction among Fig. 8.
In other words, the cut-off valve 20 of injection syringe comprises fuel channel 21, this fuel channel 21 connects the upper extreme point of nozzle 5 and the lower extreme point of piston area 3 in valve outer wall (housing) and top piston 2, and described valve outer wall is formed between the upper outer wall and nozzle outer wall of injection syringe 117a; The cut-off valve 20 of described injection syringe also comprises fuel chambers 22, and predetermined fuel can be concentrated in described fuel chambers 22, and described firing chamber 22 is formed at the bottom of fuel channel 21; The cut-off valve 20 of described injection syringe also comprises piston 24, this piston 24 is formed in the fuel chambers 22, with by the flexible downwards support of spring 23, and the cut-off valve 20 of described injection syringe also comprises electromagnet coil 25, this electromagnet coil 25 be formed at the valve outer wall in enclose the surface, be configured to sealed fuel passage 21.
Cut-off valve 20 with injection syringe of said structure passes through magnetic force hoisting piston 24, and described magnetic force is produced by applying electric energy to electromagnet coil 25 by described LPG engine control unit 105, in order to open by the fuel channel of piston 24 shutoff to nozzle 5.In addition, along with the start key On/Off, the cut-off valve 20 of described injection syringe is On/Off after the process scheduled time.
Fig. 9 is according to the flow chart of engine condition by the control procedure of the injection syringe cut-off valve 20 of LPG engine control unit 105 execution of describing among Fig. 1.LPG engine control unit 105 receives actuating signal (step 701) from start key, and determines whether described actuating signal means unlatching.(step 703)
Result as step 703, if actuating signal means unlatching, then LPG engine control unit 105 receives crank signal and cam signal (step 706) from the outside, normally whether definite crank signal that is received and cam signal (707), if and determined that the result is that described crank signal and cam signal are normal, would determine then whether described engine is driven (708) now very much.
If the definite result in the step 708 just is being driven for described engine, the LPG engine control unit 105 effective gear signal (step 709) that determines whether to detect crank based on the crank signal that in step 706, receives and cam signal then, if and determine that the result is the effective gear signal that detects crank, then LPG engine control unit 105 determines whether the cut-off valve of injection syringe closes (step 710), if and determine that the result has closed for the cut-off valve 20 of described injection syringe, then LPG engine control unit 105 is provided with the time that the cut-off valve 20 of control injection syringe is opened according to engine status information.
In other words, LPG engine control unit 105 determines that by the temperature that the fuel that provides from the outside is provided whether the fuel temperature value is more than or equal to predetermined set value (50 ℃) (step 711), if and described fuel temperature value is more than or equal to described predetermined set value, then the cut-off valve 20 with described injection syringe is set at general modfel, and is opening (step 712) according to the cylinder valve command of setting in advance through the cut-off valve 20 of controlling described injection syringe corresponding to first scheduled time (500msec) of described general modfel afterwards subsequently.
If the result of step 711 is that described fuel temperature value is less than described predetermined set value, LPG engine control unit 105 determines whether injection syringe is injecting (step 713), if and described injection syringe injects, the cut-off valve 20 of then setting injection syringe is the emergency opening pattern, and is opening (step 715) according to the cylinder valve command of setting in advance through the cut-off valve 20 of controlling described injection syringe corresponding to second scheduled time (0msec) of emergency opening pattern afterwards subsequently.In other words, be the emergency opening pattern if set the cut-off valve 20 of injection syringe, then the cut-off valve 20 of described injection syringe is directly controlled and is opened, and not free the delay.
If being described injection syringe, the result of step 713 do not injecting, then described LPG engine control unit determines whether engine is rotating (step 717), if and described engine rotates, the cut-off valve 20 of then setting injection syringe is the engine rotary mode, and is opening (step 719) according to the cylinder valve command of setting in advance through the cut-off valve 20 of controlling described injection syringe corresponding to the 3rd scheduled time (50msec) of engine rotary mode afterwards subsequently.
If the result of step 717 is that described engine is not in rotation, then described LPG engine control unit determines whether battery is in low voltage (8volt) (step 721), and if like this, then the LPG engine control unit cut-off valve 20 of setting described injection syringe is low voltage mode, and is opening (step 723) according to the cylinder valve command of setting in advance through the cut-off valve 20 of controlling described injection syringe corresponding to the 4th scheduled time (100msec) of low voltage mode afterwards subsequently.
If the result of step 721 is not in low-voltage state for described battery, then described LPG engine control unit determines that by the CAN communication information whether engine status is owing to the CAN communication line and by correct definite (step 725), and according to determining that the cut-off valve 20 that the result sets injection syringe is urgent drive pattern, and opening (step 727) according to the cylinder valve command of setting in advance through the cut-off valve 20 of controlling described injection syringe corresponding to the 5th scheduled time (500msec) of urgent drive pattern afterwards subsequently.
Thereby, when when described electromagnet coil 25 applies electric energy, cut-off valve 20 controlled the opening of injection syringe.Piston 24 is raised by the electric energy that is applied to described electromagnet coil, thereby fuel channel is always opened.At this moment, aforesaid operations does not influence by opening and closing top piston 2 control of fuelcarrying charge.
Above-mentioned first to the 5th scheduled time obtains by the experiment of the scheduled time and the value of the prior look-up table of setting.
Simultaneously, if in step 703, do not open as yet, if perhaps be not driven at step 708 engine, then described LPG engine control unit 105 applies electric energy and is closing (step 705) through the cut-off valve 20 of control injection syringe after the scheduled time to described electromagnet coil 25.In other words, if start key cuts out, then piston 24 is by blocking fuel channel through blocking the electric energy that is applied to electromagnet coil 25 from LPG engine control unit 105 after the scheduled time.
At this moment, because top piston 2 is automatically reduced to block fuel channel, the fuel channel in the injection syringe 10 has been blocked twice by two pistons.Like this, can more ideally stop liquid fuel to reveal and flow into cylinder at the engine stopping period.
Though the present invention is by showing with reference to its specific implementations and describing, should be understood that those skilled in the art can carry out various changes to form of the present invention and details under the situation that does not break away from the defined the spirit and scope of the invention of claims.
Industrial applicibility
The present invention is based on the Fuel Petroleum Injection Signal and produce the gaseous fuel Injection Signal, and directly the LPG fuel in the fuel tank is injected in the combustion chamber to drive engine by using the gaseous fuel Injection Signal that produces. Therefore, engine can be changed easily, uses the manufacturing cost of the dual-fuel automobile of LPG and gasoline to be reduced, with and manufacture process can be simplified.
Claims (45)
1. one kind is used for injecting the equipment that liquefied petroleum gas (LPG) (LPG) automobile of (LPI) system provides gasoline and LP gas fuel to having liquefied petroleum gas (LPG), and described LPI system adopts direct LPG injecting scheme, and described equipment comprises:
Be formed at a plurality of injection syringes at intake manifold place, be used in cylinder injecting Fuel Petroleum and LPG fuel one to drive engine;
The gasoline engine control unit, the result who be used for receiving from the outside engine load situation, compares according to the injection length of described Fuel Petroleum with the engine load situation that receives generates Fuel Petroleum and injects signal, is used to control the temporal information of described a plurality of injection syringes and generates the pulse signal that is used to control described a plurality of injection syringes based on described temporal information based on providing to calculate from the engine speed information of outside and proportionality constant information;
Be connected to the LPG engine control unit of described gasoline engine control unit, be used to receive according to the injection length of described Fuel Petroleum and predetermined data information, be formed at the petrolift in the LPG fuel tank and described predetermined data information compensated so that described predetermined data information is inversely proportional to the fuel pressures of discharging from described LPG fuel tank by driving, when being provided by the data information that compensated, calculating and the corresponding described proportionality constant information of fuel injection length described LPG fuel, provide the proportionality constant that calculates information to described gasoline engine control unit, and reception provides the pulse signal from described gasoline engine control unit to inject signal and this gaseous fuel injection signal is offered described a plurality of injection syringe with the gaseous fuel that described signal conversion is become to be used to drive described a plurality of injection syringes; And
The LPG engine, be used for providing described LPG fuel so that described LPG fuel mixes with providing from air outside to the intake manifold of described LPG engine by the LPG fuel tank of described LPG engine, LPG fuel in the described LPG fuel tank is discharged by driven petrolift under the control of described LPG engine control unit, and described LPG engine is returned to described LPG fuel tank by described injection syringe to the fuel that the mixed LPG fuel of described cylinder injection also will remain in described a plurality of injection syringes.
2. equipment according to claim 1, wherein said gasoline engine control unit and described LPG engine control unit are integrally formed mutually.
3. according to the described equipment of each claim in claim 1 and 2, the engine load situation of wherein said gasoline engine control unit is calculated according to one in air inflow information, throttle valve position information and the intake manifold pressure information.
4. according to the described equipment of each claim in claim 1 and 2, wherein said engine speed information is one in car speed information, crank shaft information and the camshaft location information.
5. according to the described equipment of each claim in claim 1 and 2, wherein said LPG engine control unit also comprises communication module, this communication module can be carried out controller territory network (CAN) communication, also receives the described pulse signal that provides from described gasoline engine control unit so that the described proportionality constant information that provides from described LPG engine control unit to be provided to described gasoline engine control unit.
6. equipment according to claim 5, wherein said LPG engine control unit also comprises display modular, this display modular is connected to described gasoline engine control unit, and the described LPG engine control unit from described CAN communication module to driver notice that provided by and the communication information between the described gasoline engine control unit are provided this display modular.
7. equipment according to claim 6, the wherein said communication information are by the detected fault message of described LPG engine control unit.
8. according to the described equipment of each claim in claim 1 and 2, wherein said LPG engine control unit also comprises the petrolift driver that is used to drive described petrolift.
9. according to the described equipment of each claim in claim 1 and 2, wherein the pressure of liquid LPG is than the powerful 5Bar of the fuel pressure in the described fuel tank.
10. according to the described equipment of each claim in claim 1 and 2, wherein said LPG engine control unit storage peak time, retention time information and saturation time information, described peak time is the initial driving time of described injection syringe, the described retention time is that the driving of described injection syringe is held time, described saturation time information is used under the situation that crystalline polamer takes place based on providing external air temperature and cooling water temperature from described gasoline engine control unit to eliminate described crystalline polamer, described LPG engine control unit also is used for the injection syringe control command of basis programming in advance when satisfying the condition that produces crystalline polamer and exports the saturation signal that is used to provide described saturation time, and described LPG engine control unit also is used for exporting peak value and the inhibit signal that is used to provide described peak time and retention time when not satisfying the condition that produces crystalline polamer.
11. equipment according to claim 10, wherein said saturation signal have the interval of increasing and keeps the interval, electric current increases to provide predetermined voltage to described injection syringe in described increase interval.
12. according to the described equipment of each claim in claim 1 and 2, each injection syringe in wherein said a plurality of injection syringes comprises:
Output driver, when described engine during by initial driving, described output driver is connected to the output terminal of described LPG engine control unit so that one in peak value and inhibit signal and the saturation signal to be provided to corresponding injection syringe; And
The current probe part is used to detect the output current of corresponding injection syringe and exports the injection syringe current information to provide electric current to described LPG engine control unit.
13. equipment according to claim 12, the wherein said current probe part described injection syringe current information of monitoring and control the electric current that offers corresponding injection syringe according to monitoring result during described peak time.
14. equipment according to claim 13, wherein said current probe partly comprises:
Current probe is used to detect the electric current of described output driver so that electric current is exported with the form of voltage; And
Comparator is used for the output voltage and the predetermined reference voltage of described current probe are compared, and exports described injection syringe current information according to comparative result.
15. equipment according to claim 14, wherein said comparator is used for when the output voltage of described current probe is equal to or greater than described reference voltage output and has other injection syringe current information of low potential level, and output had other injection syringe current information of high potential level when described comparator also was used for output voltage at described current probe less than described reference voltage.
16. equipment according to claim 14, wherein said comparator is used for when the output voltage of described current probe is equal to or less than described reference voltage output and has other injection syringe current information of high potential level, and output had other injection syringe current information of low potential level when described comparator also was used for output voltage at described current probe greater than described reference voltage.
17. equipment according to claim 12, wherein said corresponding injection syringe also comprises the cut-off valve of injection syringe, this cut-off valve is formed on the fuel channel between piston and the nozzle, and this cut-off valve is used for blocking the fuel channel between described piston and the described nozzle when start key cuts out, described piston is used to open and close the fuel channel between import and the described nozzle, described piston is raised by electromagnet coil or falls, and fuel flows into described import and is injected into by described nozzle, if and the actuating signal that wherein receives is to open, then described LPG engine control unit is based on providing crank shaft information and camshaft location information from described gasoline engine control unit to determine whether described engine is driven, if and determined that described engine is driven, then described LPG engine control unit would receive the time that the engine status information of described gasoline engine control unit is opened with the cut-off valve that changes the described injection syringe of control.
18. equipment according to claim 17, wherein under definite driven situation of described engine, if detect first effective gear engagement by described crank shaft information and described camshaft location information, the time that the engine status information that then described LPG engine control unit receives described gasoline engine control unit is opened with the cut-off valve that changes the described injection syringe of control.
19. being fuel temperature information, fuel, equipment according to claim 18, wherein said engine status information injects one or more of status information, engine rotation information, battery voltage information and CAN communicate status information.
20. equipment according to claim 17, wherein under definite driven situation of described engine, if the fuel temperature information that oneself outside is provided is more than or equal to predetermined value, then described LPG engine control unit is controlled the cut-off valve of described injection syringe and is opened after through first scheduled time.
21. equipment according to claim 20, wherein said predetermined value are 50 ℃, and described first scheduled time is 100msec.
22. equipment according to claim 17, wherein under definite driven situation of described engine, if described a plurality of injection syringe injects status information and is confirmed as just injecting LPG fuel based on fuel, then described LPG engine control unit is controlled the cut-off valve of described injection syringe and is opened after through second scheduled time.
23. equipment according to claim 22, wherein said second scheduled time is 0msec.
24. equipment according to claim 17, wherein under definite driven situation of described engine, if described engine is confirmed as being rotated based on the engine rotation information, then described LPG engine control unit is controlled the cut-off valve of described injection syringe and is opened after through the 3rd scheduled time.
25. equipment according to claim 24, wherein said the 3rd scheduled time is 50msec.
26. equipment according to claim 17, wherein under definite driven situation of described engine, if cell voltage is confirmed as being less than or equal to predetermined set value based on battery information, then described LPG engine control unit is controlled the cut-off valve of described injection syringe and is opened after through the 4th scheduled time.
27. equipment according to claim 26, wherein said predetermined set value is 8volt, and described the 4th scheduled time is 100msec.
28. equipment according to claim 17, wherein under definite driven situation of described engine, if it is wrong that the CAN communication line is confirmed as based on the CAN communicate status information, then described LPG engine control unit is controlled the cut-off valve of described injection syringe and is opened after through the 5th scheduled time.
29. equipment according to claim 28, wherein said the 5th scheduled time is 500msec.
30. a method that is used for providing to the LPG automobile with LPI system fuel, this method comprises the following steps:
(a) receive the engine load situation by providing from outside throttle valve position information and intake manifold input information, and the result that will compare with the engine load that receives situation according to the Fuel Petroleum injection length and predetermined data information is sent to the LPG engine control unit;
(b) described LPG engine control unit receives according to described Fuel Petroleum injection length and predetermined data information, be formed at the petrolift in the LPG fuel tank and described predetermined data information compensated so that described predetermined data information is inversely proportional to the fuel pressures of discharging from described LPG fuel tank by driving, when being provided by the data information that compensated, calculating and the corresponding proportionality constant information of fuel injection length described LPG fuel, and provide the proportionality constant that calculates information to described gasoline engine control unit;
(c) the gasoline engine control unit is used to control the pulse signal of described a plurality of injection syringes described pulse signal is sent to described LPG engine control unit based on providing to calculate to be used to control the temporal information of a plurality of injection syringes and to generate based on described temporal information from outside engine speed information, Fuel Petroleum injection length information in the step (a) and the proportionality constant information in the step (b);
(d) described LPG engine control unit the pulse signal that provides from described gasoline engine control unit is provided also this LPG fuel injection signal is offered described a plurality of injection syringe with the LPG fuel injection signal that described signal conversion is become to be used to drive described a plurality of injection syringes; And
(e) provide described LPG fuel so that described LPG fuel mixes with providing from air outside to described intake manifold, LPG fuel in the described LPG fuel tank is discharged by driven petrolift under the control of described LPG engine control unit, injects mixed LPG fuel by described injection syringe to cylinder and returns to described LPG fuel tank with the fuel that drives described engine and will remain in described a plurality of injection syringes.
31. method according to claim 30, wherein said engine load situation is calculated according to one in air inflow information, throttle valve position information and the intake manifold pressure information.
32. according to the described method of each claim in claim 30 and 31, wherein engine speed is one in car speed information, crank shaft information and the camshaft location information.
33. method according to claim 30, wherein CAN communication is performed to transmit to described gasoline engine control unit to provide the described pulse signal that provides from described gasoline engine control unit is provided from the described proportionality constant information of described LPG engine control unit and by described LPG engine control unit.
34. method according to claim 33, this method also comprises the following steps:
(f) show the described LPG engine control unit that provides by the CAN communication module and the communication information between the described gasoline engine control unit.
35. method according to claim 34, the wherein said communication information are by the detected fault message of described LPG engine control unit.
36. method according to claim 30, wherein step (d) determines based on providing from outside external air temperature and cooling water temperature whether the condition that produces crystalline polamer in the end of described a plurality of injection syringes is satisfied, and respectively, if producing the condition of described crystalline polamer is satisfied, the saturation signal of saturation time information that then will have the crystalline polamer that is used to eliminate described a plurality of injection syringes place is with the form output of continuous signal, if and the condition that produces described crystalline polamer is not satisfied, the peak value and the inhibit signal that then will have peak time and retention time information are exported with the form of continuous signal, described peak time is the initial driving time of described injection syringe, and the described retention time is that the driving of described injection syringe is held time.
37. method according to claim 30, wherein step (d) comprises the following steps:
(d-1) determine based on providing whether the condition that produces crystalline polamer in the end of described a plurality of injection syringes is satisfied from outside external air temperature and cooling water temperature;
(d-2) if the result of step (d-1), then will have the saturation signal of saturation time information of the crystalline polamer that is used to eliminate described a plurality of injection syringes place for the condition that produces described crystalline polamer is satisfied with the form output of continuous signal;
(d-3), then be provided at the peak signal that provides during the described peak time and the pulse duration modulation inhibit signal during the described retention time to described a plurality of injection syringes according to the injection syringe control command of programming in advance if the result of step (d-1) is not satisfied for the condition that produces described crystalline polamer.
38. according to the described method of claim 37, wherein step (d) also comprises the following steps:
(d-4) detect the output current of described a plurality of injection syringes with output injection syringe current information; And
(d-5) receive described injection syringe current information with the described injection syringe current information of monitoring during described peak time from described LPG engine control unit, and control the electric current that is provided to described a plurality of injection syringes according to monitoring result.
39. according to the described method of claim 38, wherein step (d-5) is exported when the output voltage of described current probe is equal to or greater than reference voltage and is had other injection syringe current information of low potential level, and the output voltage of described current probe during less than described reference voltage output have other injection syringe current information of high potential level.
40. according to the described method of claim 38, wherein step (d-5) is exported when the output voltage of described current probe is equal to or less than reference voltage and is had other injection syringe current information of high potential level, and the output voltage of described current probe during greater than described reference voltage output have other injection syringe current information of low potential level.
41. method according to claim 30, wherein step (e) receives the engine status information of described gasoline engine control unit and changes the time that the cut-off valve that is used to control described injection syringe is opened, and the fuel than the connecting path between lower part and the nozzle of the cut-off valve control piston of described injection syringe injects and fuel blocks.
42. according to the described method of claim 41, wherein said engine status information is that fuel temperature information, fuel inject one or more of status information, engine rotation information, battery voltage information and CAN communicate status information.
43. method according to claim 30, wherein step (e) also comprises the following steps:
(e-1) receive crank shaft information and camshaft location information from the outside, determine whether the crank shaft information and the camshaft location information that receive is normal, if and the result who determines is normal for described crank shaft information and camshaft location information, determine then whether described engine just is being driven; And
(e-2) if described engine just is driven, then determine whether to detect the effective gear engagement signal of crank based on described crank shaft information and camshaft location information, if and the result who determines is the effective gear engagement signal that detects described crank, then receives engine status information and open with the cut-off valve of controlling described injection syringe from the outside.
44., wherein receive engine status information in the step (e-2) from the outside and open with the cut-off valve of controlling described injection syringe and comprise the following steps: according to the described method of claim 43
(e-2A) if provide from outside fuel temperature information, then open through the cut-off valve of controlling described injection syringe after first scheduled time more than or equal to predetermined value;
(e-2B) if described a plurality of injection syringe injects status information and is confirmed as just injecting LPG fuel based on fuel, then open through the cut-off valve of controlling described injection syringe after second scheduled time;
(e-2C), then open through the cut-off valve of controlling described injection syringe after the 3rd scheduled time if described engine is confirmed as being rotated based on the engine rotation information;
(e-2D), then open through the cut-off valve of controlling described injection syringe after the 4th scheduled time if cell voltage is confirmed as being less than or equal to predetermined set value based on battery information;
(e-2E) wrong if the CAN communication line is confirmed as based on the CAN communicate status information, then open through the cut-off valve of controlling described injection syringe after the 5th scheduled time.
45. according to the described method of claim 44, the predetermined value of wherein said fuel temperature information is 50 ℃, described first scheduled time is 500msec, described second scheduled time is 0msec, described the 3rd scheduled time is 50msec, the described predetermined set value of cell voltage is 8volt, and described the 4th scheduled time is 100msec, and described the 5th scheduled time is 500msec.
Applications Claiming Priority (19)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060049557A KR100725702B1 (en) | 2006-06-01 | 2006-06-01 | Method for controlling of cut-off valve of injector of lpg car |
| KR1020060049557 | 2006-06-01 | ||
| KR10-2006-0049557 | 2006-06-01 | ||
| KR1020060085361 | 2006-09-05 | ||
| KR1020060085361A KR100749246B1 (en) | 2006-09-05 | 2006-09-05 | Method for controlling of cut-off solenoid valve of injector of lpg car |
| KR10-2006-0085361 | 2006-09-05 | ||
| KR10-2006-0106863 | 2006-10-31 | ||
| KR20060106863 | 2006-10-31 | ||
| KR1020060106863 | 2006-10-31 | ||
| KR10-2006-0107288 | 2006-11-01 | ||
| KR20060107288 | 2006-11-01 | ||
| KR1020060107288 | 2006-11-01 | ||
| KR10-2006-0108384 | 2006-11-03 | ||
| KR1020060108384 | 2006-11-03 | ||
| KR1020060108384A KR100756188B1 (en) | 2006-11-03 | 2006-11-03 | Apparatus and method for controlling peak and hold type injector of car |
| KR1020060135050 | 2006-12-27 | ||
| KR20060135050 | 2006-12-27 | ||
| KR10-2006-0135050 | 2006-12-27 | ||
| PCT/KR2007/002646 WO2007139358A1 (en) | 2006-06-01 | 2007-05-31 | Method and apparatus for supplying fuel of lpg car having lpi system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101506506A CN101506506A (en) | 2009-08-12 |
| CN101506506B true CN101506506B (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800266183A Active CN101506506B (en) | 2006-06-01 | 2007-05-31 | Method and apparatus for supplying fuel of LPG car having LPI system |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100725702B1 (en) |
| CN (1) | CN101506506B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100878121B1 (en) | 2007-08-13 | 2009-01-12 | 콘티넨탈 오토모티브 시스템 주식회사 | Method for controlling of cut-off valve of injector of lpg car |
| CN101806253B (en) * | 2010-04-19 | 2011-12-14 | 浙江大学 | Fuel-supply control device of dual-fuel engine |
| WO2011153069A1 (en) * | 2010-06-01 | 2011-12-08 | Cummins Intellectual Properties, Inc. | Control system for dual fuel engines |
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| US5325838A (en) * | 1993-05-28 | 1994-07-05 | Bennett David E | Liquified petroleum gas fuel injector |
| CN1297105A (en) * | 2000-12-28 | 2001-05-30 | 上海交通大学 | Control system of dual-fuel car for lower exhaustion |
| CN2497055Y (en) * | 2001-08-10 | 2002-06-26 | 江苏理工大学 | Electric control device for LPG, CNG/diesel oil dual-fuel automobile engine |
| CN1450148A (en) * | 2002-04-10 | 2003-10-22 | 北京三聚环保新材料有限公司 | Carbon mono oxide combustion improver and preparation method and use |
| JP2005180228A (en) * | 2003-12-17 | 2005-07-07 | Nikki Co Ltd | Fuel supply method and device for internal combustion engine |
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| JPH09250421A (en) * | 1996-03-13 | 1997-09-22 | Denso Corp | Fuel injection solenoid valve |
| KR20040028887A (en) * | 2004-02-19 | 2004-04-03 | 박국현 | The preventive device of fuel leakage in a LPG-automobile |
| KR20060021081A (en) * | 2004-09-02 | 2006-03-07 | 현대자동차주식회사 | Fuel leak preventing structure of injector in lpg vehicles |
| KR100663619B1 (en) * | 2004-10-13 | 2007-01-02 | 씨멘스 오토모티브 주식회사 | Apparatus and method For controlling Fuel cut of LPI car |
| KR100692132B1 (en) * | 2004-12-17 | 2007-03-12 | 현대자동차주식회사 | Structure of cut-off solenoid injector |
-
2006
- 2006-06-01 KR KR1020060049557A patent/KR100725702B1/en not_active IP Right Cessation
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- 2007-05-31 CN CN2007800266183A patent/CN101506506B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5325838A (en) * | 1993-05-28 | 1994-07-05 | Bennett David E | Liquified petroleum gas fuel injector |
| CN1297105A (en) * | 2000-12-28 | 2001-05-30 | 上海交通大学 | Control system of dual-fuel car for lower exhaustion |
| CN2497055Y (en) * | 2001-08-10 | 2002-06-26 | 江苏理工大学 | Electric control device for LPG, CNG/diesel oil dual-fuel automobile engine |
| CN1450148A (en) * | 2002-04-10 | 2003-10-22 | 北京三聚环保新材料有限公司 | Carbon mono oxide combustion improver and preparation method and use |
| JP2005180228A (en) * | 2003-12-17 | 2005-07-07 | Nikki Co Ltd | Fuel supply method and device for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100725702B1 (en) | 2007-06-07 |
| CN101506506A (en) | 2009-08-12 |
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