EP0971119B1 - Système d'injection de combustible à rampe commune - Google Patents
Système d'injection de combustible à rampe commune Download PDFInfo
- Publication number
- EP0971119B1 EP0971119B1 EP19990305441 EP99305441A EP0971119B1 EP 0971119 B1 EP0971119 B1 EP 0971119B1 EP 19990305441 EP19990305441 EP 19990305441 EP 99305441 A EP99305441 A EP 99305441A EP 0971119 B1 EP0971119 B1 EP 0971119B1
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- EP
- European Patent Office
- Prior art keywords
- fuel
- injection
- pressure
- valve
- common
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002347 injection Methods 0.000 title claims description 164
- 239000007924 injection Substances 0.000 title claims description 164
- 239000000446 fuel Substances 0.000 claims description 220
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- 238000012544 monitoring process Methods 0.000 claims description 8
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- 238000005507 spraying Methods 0.000 claims description 2
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- 239000002131 composite material Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
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- 239000002828 fuel tank Substances 0.000 description 3
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- 230000000977 initiatory effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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- 230000007423 decrease Effects 0.000 description 1
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- 230000011664 signaling Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
Classifications
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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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
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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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure
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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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
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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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
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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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0059—Arrangements of valve actuators
- F02M63/0068—Actuators specially adapted for partial and full opening of the valves
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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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/31—Control of the fuel pressure
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
Definitions
- the present invention relates to a common-rail fuel-injection system in which fuel supplied under high pressure from a common rail is injected with the action of a fuel pressure into the combustion chambers of engines.
- a common-rail fuel-injection system in which the fuel stored under high-pressure in the common rail is applied to the injectors, which are in turn actuated by making use of a part of the high-pressure fuel as a working fluid to thereby spray the fuel applied from the common rail into the combustion chambers out of discharge orifices formed at the distal ends of the injectors.
- a fuel feed pump 6 draws fuel from a fuel tank 4 through a fuel filter 5 and forces it under a preselected intake pressure to a high-pressure, fuel-supply pump 8 through a fuel line 7.
- the high-pressure, fuel-supply pump 8 is of, for example, a fuel-supply plunger pump driven by the engine, which intensifies the fuel to a high pressure determined depending on the engine operating conditions, and supplies the pressurized fuel into the common rail 2 through another fuel line 9.
- the fuel, thus supplied, is stored in the common rail 2 at the preselected high pressure and forced to the injectors 1 through injection lines 3 from the common rail 2.
- the engine illustrated is a six-cylinder engine.
- the injectors 1 are arranged in combustion chambers, each to each chamber, of a multi-cylinder engine, for example, a six-cylinder engine in FIG. 15.
- the controller unit 12 is applied with various signals of sensors monitoring the engine operating conditions, such as a crankshaft position sensor for detecting the engine rpm Ne, an accelerator pedal sensor for detecting the depression Ac of an accelerator pedal, a high-pressure fuel temperature sensor and the like.
- the sensors for monitoring the engine operating conditions include an engine coolant temperature sensor, an intake manifold pressure sensor and the like.
- the controller unit 12 is also applied with a detected single as to a fuel pressure in the common rail 2, or a common-rail pressure, which is transmitted from a pressure sensor 13 installed in the common rail 2.
- the controller unit 12 defines the fuel-injection conditions, including the injection timing and the quantity of fuel injected, depending on the applied signals, so as to allow the engine to operate as fuel-efficient as possible and controls the fuel injection in accordance with the consequent fuel-injection conditions.
- the quantity of fuel injected per cycle is determined by the combination of injection duration with an injection pressure of the fuel sprayed out of the injectors.
- the injection pressure is substantially equal with the common rail pressure controlled by operating a flow-rate control valve 14, which is to regulate the quantity of delivery of the high-pressure fuel to the common rail 2.
- the controller unit 12 actuates the fuel flow-rate control valve 14, which in turn regulates the quantity of delivery of the fuel from the high-pressure, fuel-supply pump 8 to the common rail 2 whereby the common rail pressure recovers the preselected fuel pressure.
- the injector 1 at which the fuel injection is controlled comprises an injector body 21, and an injection nozzle 22 mounted to the injector body 21 and formed therein with an axial bore 23 in which a needle valve 24 is fitted for a sliding movement.
- the high-pressure fuel applied to the individual injector 1 from the common rail 2 through the associated injection line 3 fills fuel passages 31, 32 and a fuel pocket 33 formed in the injector body 21.
- the high-pressure fuel further reaches around the needle valve 24 in the axial bore 23. Therefore, the instant the needle valve 24 is lifted to open discharge orifices 25 at the distal end of the injection nozzle 22, the fuel is injected out of the discharge orifices 25 into the combustion chamber.
- the needle valve 24 has a tapered end 27 that moves upwards off or downwards against a tapered surface 28 inside the injection nozzle 22 whereby the fuel injection starts or ceases.
- the injector 1 is provided with a needle-valve lift mechanism of pressure-control chamber type in order to adjust the lift of the needle valve 24. That is to say, the high-pressure fuel fed from the common rail 2 is partly admitted into a pressure-control chamber 40, which is formed inside the injector 1, past a slot 35 communicating with the fuel passage 31.
- the injector 1 has at the head section thereof a solenoid-operated valve 15, which constitutes an electronically-operated actuator to control the outflow of working flow to the pressure-control chamber 40.
- the controller unit 12 actuates the solenoid-operated valve 15 in compliance with the engine operating conditions, thereby adjusting the hydraulic pressure of the working fluid in the pressure-control chamber 40 to either the high pressure of the admitted high-pressure fuel or a low pressure released partially in the pressure-control chamber 40.
- a control signal issued from the controller unit 12 is an exciting signal applied to a solenoid 38 of a solenoid-operated valve 15.
- the solenoid-operated valve 15 includes an armature 39 having at its end a valve 42 for opening and closing an egress of a fuel leakage path 41.
- valve 42 On energizing a solenoid 38, the armature 39 rises to open the valve 42, as shown by broken lines, whereby the fuel in the pressure-control chamber 40 is allowed to discharge, resulting in relieving the high pressure of the fuel in the pressure-control chamber 40.
- the valve 42 may be alternatively made of a poppet valve composed of a valve stem extending through the fuel leakage path 41, and a tapered valve body provided at the end of the valve stem and having a valve face to make an engagement with a valve seat at an ingress of the fuel leakage path 41.
- a control piston 44 is arranged for axial linear movement in an axial recess 43 formed in the injector body 21 of the injector 1.
- the control piston 44 shown in the figure is formed integrally with the needle valve 24, the control piston may be formed separately from the needle valve and combined together with each other such that they may be energized so as to follow one another.
- the solenoid-operated valve 15 is energized to cause the fuel pressure inside the pressure-control chamber 40 to reduce, the consequent force, acting on the control piston 44 to pushing it downward, is made less than the fuel pressure acting on both a tapered surface 34 exposed to the pocket 33 and the distal end of the needle valve 24, whereby the control valve 44 moves upwards.
- the needle valve 24 lifts to allow the fuel to spray out of the discharge orifices 25.
- the quantity of fuel injected per cycle is defined dependent on the fuel pressure and both the amount and duration of lift of the needle valve 24.
- the common-rail fuel-injection system, or the pressure-balance, fuel-injection system, as described above is disclosed in, for example, Japanese Patent Laid-Open Nos. 165858/1984 and 282164/1987, in which the fuel supplied under pressure from the common rail 2 to the injectors 1 is partly applied to the pressure-control chamber 40, or the pressure balance chamber, in the injectors 1, acting as the working fluid to lift the needle valve 24 to inject the fuel out of the discharge orifices 25.
- Japanese Patent Laid-Open No. 271881/1986 is a fuel-injection system in which the fuel-injection rating is variably controlled in accordance with the amount of electric charge emission of the piezoelectric actuator.
- the injector 1 shown in FIG. 16 is provided with a second solenoid-operated valve 46, in addition to a first solenoid-operated valve 45 having an armature 39. Energizing and deenergizing the second solenoid-operated valve 46 causes shifting a moving part 47 of the second solenoid-operated valve 46 to thereby stepwise alter the position of the moving part 47 against which the armature 39 abuts to cease its motion, namely, to vary the effective stroke of the armature 39.
- the armature 39 ceases its motion determines that the most narrowed location in the path allowing the fuel to flow out of the pressure-control chamber 40 is either of the fuel leakage path 41 and the opening area defined between the armature 39 and the egress of the fuel leakage path 41 thereby to control the relief of the fuel pressure out of the pressure-control chamber 40.
- This results in varying the lift of the needle valve 24 by which the fuel pressure in the pressure-control chamber 40 is balanced in equilibrium thereby varying the throttling effect occurring between the tapered end 27 of the needle valve 24 and the tapered valve seat 28 inside the injection nozzle 22 to control a quantity of fuel injected out of the discharge orifices 25.
- the valve 42 is urged to its closure position by the action of a return spring 48.
- FIG. 17 showing a fragmentary enlarged illustration of a prior injector 50 in which both the discharge orifices and the needle vale 24 are modified in structure to make it possible to vary stepwise the quantity of fuel injected.
- the fuel is applied to the fuel sac 26 at the distal end of the injector 50 past a fuel passage 58 formed in a radially reduced section 57 of the end of the needle valve 24 and further past a fuel passable hole 56.
- the fuel in the fuel sac 26 is allowed to spray out of only discharge orifices 51 arranged closer to the bottom of the fuel sac 26.
- the fuel in the fuel sac 26 is also injected out of not only the lower discharge orifices 51 but also upper discharge orifices 52. It will be thus understood that the quantity of fuel injected is made less at a little lift of the needle valve 24 or at an initial portion of the lift of the needle valve 24.
- the prior injectors as described above involves major problems of the need of using additional solenoid-operated valve, the complication in shape and structure of not only the injection nozzle but also the discharge orifices, with bringing about the increase of the cost of production and the productivity decease.
- the discharge orifices are arranged in rows spaced apart from each other in an axial direction of the injection nozzle, only two patterns of injection rating are permitted and, therefore, it is very hard to control the quantity of fuel injected in accordance with the rotational speed and the engine load, which are variable over the wide ranges, respectively.
- the integral thereof represents the quantity of fuel injected, while the differential thereof is the rate of change of the injection rating.
- the graphic curve of the injection rating at the early portion of the fuel injection affects the heat release rate at the initial combustion and has a great influence on the engine noise and the exhaust gases performance.
- the fuel-injection rating is controlled by the lift of the needle valve 24, which is defined by the pressure inside the pressure-control chamber, which is in turn determined by the operation of the actuator in the injector. To cope with the problem above, therefore, it is expected to develop the fuel-injection system in which controlling the operation of the actuator results in controlling the injection rating.
- US, 5,133,645 discloses a common rail fuel system which consists of a high pressure fuel pump, nozzles and a rail or rails having a substantially constant rail pressure situated between the fuel pump and the nozzles, the necessary connecting fuel lines and electronic control system.
- the pump is constructed to add leakage fuel to each stroke output without the necessity for routing this leakage fuel through the primary supply.
- US 5,713,326 discloses an injection nozzle for use in a common rail system including a nozzle body with an actuator piston. An electronic control device is connected by means of its outputs to the injection nozzle.
- the present invention has for its primary aim to provide a common-rail fuel-injection system in which the fuel injection may be selected arbitrarily and continuously over the wide ranges of the rotational speed and the engine load by only controlling the actuator of conventional type with no need of adding other new means and/or the special modification in structure, which might otherwise cause the increase of the cost of production.
- a common-rail fuel-injection system comprising injectors for spraying fuel into combustion chambers of an engine, a common rail storing therein the fuel to be applied to the injectors, a high-pressure fuel pump for delivery of the fuel to the common rail detecting means for monitoring engine operating conditions, and a controller unit for regulating fuel injection out of the injectors in compliance with signals reported from the detecting means, wherein the injectors each include a pressure-control chamber applied with a part of the fuel fed from the common rail, a needle valve movable upward and downward, depending on a hydraulic action of the fuel in the pressure-control chamber, to thereby open and close discharge orifices at a distal end of the injector, a valve for allowing the fuel to discharge out of the pressure-control chamber thereby resulting in relieving the fuel pressure in the pressure-control chamber, and an actuator for driving the valve, wherein the controller unit produces an exciting signal, in compliance with the signals transmitted from the detecting means, to energize the actuator that in
- the controller unit produces an exciting signal in accordance with signals transmitted from the detecting means for monitoring the engine operating conditions, and the consequent exciting signal energizes the actuator, which in turn operates its associated valve in such a manner that the valve is controlled within a stroke including a range over which the opening area may vary, thereby regulating the lift of the needle valve with resulting in controlling the fuel injection out of the discharge orifices at the distal end of the injector.
- the fuel may be injected with the optimum fuel-injection condition including, for example, the initial fuel injection, in compliance with the engine operating conditions.
- a common-rail fuel-injection system wherein the actuator is composed of piezoelectric elements.
- the exciting signal is of an exciting voltage applied to the piezoelectric elements.
- the actuator may be composed of an electromagnetic solenoid and the exciting signal is of an exciting voltage applied to the solenoid or an exciting current supplied to the solenoid.
- a common-rail fuel-injection system wherein the actuator-operated valve is of a lift valve for opening and closing an egress of a fuel leakage path through which the fuel flows out of the pressure-control chamber.
- the actuator-operated valve may be of a poppet valve, which comprises a valve stem extending through the fuel leakage path allowing the fuel to leak out of the pressure-control chamber, and a valve head mounted to the valve stem at the side of the pressure-control chamber and having a valve face to make a contact with a valve seat formed at an ingress of the fuel leakage path.
- the controller unit stores therein a first mapped data of a correlation defined previously between an initial controlled variable of the fuel injection at an early portion of the fuel injection and a desired quantity of fuel injected, and stores therein a second mapped data of a correlation defined previously among a desired common-rail pressure, the initial controlled variable of the fuel injection and the exciting signal, thereby finding, based on the signals transmitted from the detecting means, the desired quantity of fuel injected and the desired common-rail pressure corresponding to the desired quantity of fuel injected, finding on the first mapped data the initial controlled variable of the fuel injection in accordance with the desired quantity of fuel injected, and calculating on the second mapped data the exciting signal corresponding to the initial controlled variable of the fuel injection.
- the initial controlled variable of fuel injection is then found on the first mapped data in compliance with the desired quantity of fuel injected, and the exciting signal to drive the injector is calculated on the second mapped data in accordance with the initial controlled variable of the fuel injection whereby the fuel injection may be achieved with the initial controlled variable of the fuel injection.
- a common-rail fuel-injection system wherein the initial controlled variable of the fuel injection is any one of an initial quantity of fuel injected, an initial fuel-injection rating and a rate of change of the initial fuel-injection rating. Namely, according to what pattern of the exciting signal is applied, any desired one of the initial quantity of fuel injected, the initial fuel-injection rating and the rate of change of the initial fuel-injection rating may be made to conform with its associated desired value to thereby control the fuel injection.
- the injection rating during the early portion of the injection duration increases linearly as the time of injection proceeds and there is a mutually proportional correlation among the initial quantity of fuel injected at the early portion of the fuel-injection duration, the injection rating and the rate of change of the fuel-injection rating, so that the rate of change of the injection rating may be, for example, used as a parameter for control.
- the control of the exciting signal to be applied to the actuator results in adjusting the pressure drop in the pressure-control chamber to thereby control the lift of the needle valve.
- This makes it possible to control the fuel injection in compliance with not only the quantity of fuel injected but also the fuel-injection rating and the rate of change of the injection rating.
- the present invention may provide the common-rail fuel-injection system in which the fuel injection may be selected arbitrarily and continuously over the wide ranges of the rotational speed and the engine load by only modifying the control of the conventional actuator with no need of adding other new means and/or the special modification in structure, which might otherwise causes the increase of the cost of production.
- FIGS. 1 to 14 A preferred embodiment of a common-rail fuel-injection system for engines according to the present invention will be explained in detail hereinafter with reference to FIGS. 1 to 14.
- the common-rail fuel-injection system as described above in connection with FIGS. 15 is substantially applicable to the system according to the present invention.
- the relationship of the fuel-injection rating with the operating of the actuator will be described in the following in connection with a commonly used injector 60 shown in FIG. 3.
- the injector 60 is substantially equal with the injector described above, except for the actuator being composed of a single solenoid-operated valve 65 and the pressure-control chamber 40 being applied with the fuel past fuel passages 35, 36.
- the actuator being composed of a single solenoid-operated valve 65 and the pressure-control chamber 40 being applied with the fuel past fuel passages 35, 36.
- Most of components of the system thus, are the same as previously described. To that extent, the components have been given the same reference characters, so that the previous description will be applicable to the injector 60.
- the fuel leaking past the valve 42 is recovered via low-pressure side return line 11.
- the fuel-injection rating should be dependent on only the opening area at the egress of the pressure-control chamber 40 if the designs of the common-rail pressure and the needle valve 24 or the injection nozzle 22 are determined. In the meantime it is to be noted that there is a fixed correlation, as shown in FIG. 5, between the opening area at the egress of the pressure-control chamber 40 and the valve 42.
- the fuel-injection rating thus may be controlled by shifting the valve 42 to the lift at which the most narrowed location is provided at the egress of the fuel leakage path 41.
- the valve 42 does not necessarily need of keeping the given lift, but decelerating its lift motion may be sufficient.
- FIG. 4 is a fragmentary enlarged section illustrating the fuel leakage of the fuel out of the pressure-control chamber 40 in the injector 60 in FIG. 3, when the lift L of the valve 42 is less, the amount of fuel leaking out of the pressure-control chamber 40 past the fuel leakage path 41 is not depend on the fuel leakage path 41, but defined by an open space 61 provided between the armature 39 and the egress of the fuel leakage path 41. That is to say, the open area Sa spanning across the open space 61 is less than the cross-sectioned area Sb of the fuel leakage path 41 so that the most narrowed location is provided at the open space 61.
- the open area Sa at the open space 61 becomes wider than the cross-sectioned area Sb of the fuel leakage path 41 so that the amount of fuel leaking out of the pressure-control chamber 40 is dominated by the fuel leakage path 41, which is now the most narrowed location.
- the opening area S of the valve 42 increases as the lift L of the valve 42 increases, so long as the lift L is less than a fixed distance L 0 .
- the opening area S is kept at the cross-sectioned area Sb of the fuel leakage path 41 after the lift L reaches the fixed distance L 0 .
- the amount of fuel leaking out of the pressure-control chamber 40 may be controlled in accordance with the lift of the valve 42, provided the lift does not exceed the L 0 . This is major ground for conception that controlling the lift of the valve results in adjusting the lift of the needle valve 24 to thereby regulate the fuel-injection rating.
- the actuator used in the present invention may be composed of any one of (a) solenoid-operated valve and (b) piezoelectric element, each of which has the characteristics described below.
- an electromagnetic attraction characteristic as shown in FIG. 6 appears between the exciting current and the consequent attractive force in the solenoid-operated valve controlled by the exciting current.
- an attraction-response characteristic as shown in FIG. 7 exists between the exciting voltage and the consequent attraction-response lag in the solenoid-operated valve controlled by the exciting voltage.
- the piezoelectric element has a linear response characteristic with respect to the exciting voltage so that the position of the valve 42 may be adjusted in a direct proportion to varying the exciting voltage.
- FIG. 9 shows fuel-injection characteristics in the event in which the solenoid-operated valve is controlled under the exciting voltage.
- the value of current is plotted with the exciting voltage, signaled to the solenoid-operated valve, as a parameter, even if the exciting voltage is reduced in magnitude, the value of current has no tendency to lower suddenly provided there is no largely sudden voltage fall.
- the valve starts to lift with a time lag while the lift motion of the valve is made less in speed as well as in peak.
- reducing the exciting voltage causes the start of fuel injection to delay and also makes the rate, or the slope, of the fuel-injection rating less steep.
- the initial quantity of fuel injected goes down steeply with the reduction of the exciting voltage.
- FIG. 10 shows fuel-injection characteristics in the event in which the solenoid-operated valve is controlled under the exciting current.
- the attractive force is plotted with the exciting current, signaled to the solenoid-operated valve, as a parameter, the attractive force lowers in accordance with the reduction of the exciting current at the early stage of the instruction to start the fuel injection.
- the middle graph about the lift of the solenoid-operated valve shows that, as the exciting current lowers, the lift motion of the valve is made less in speed as well as in peak. Nevertheless, the time lag for the start of lift of the valve is less, compared to the case of the exciting voltage.
- reducing the exciting voltage causes the start of fuel injection to delay and also has trend of making the rate, or the slope, of the fuel-injection rating less steep.
- the time lag of the start of the fuel injection is also less, compared with the case of the exciting voltage.
- the initial quantity of fuel injected goes down in approximately direct proportion with the reduction of the exciting current.
- FIG. 11 shows fuel-injection characteristics about the control with the piezoelectric element.
- the displacement of the push rod, or the output of the piezoelectric element may vary with good response to the voltage fall, while the bottom graph teaches the rate of change, or the slope, of the injection rating is affected largely by the voltage fall.
- a time t 0 the command pulse falls is a timing at which an instruction to initiate the fuel injection is applied to the injector 1, which in turn begins an actual fuel injection at a timing t, after a lapse of the start-delay time T caused by the response lag of the working fluid inthe pressure-control chamber 40.
- the common-rail pressure Pcr starts to drop.
- 101149/1999 is a method of finding the start-delay time T spanning from a command pulse fall to control the exciting signal applied to the actuator in the injector to the timing for the initiation of the actual fuel injection.
- the method in our co-pending application will be explained with reference to FIG. 14.
- the timing for the start of common rail-pressure drop is defined at a time-coordinate t 3 where the approximate straight line Ld intersects with an approximate line Lp prior to the descending trend, which shows a mean pressure before the start of common-rail pressure drop.
- the start-delay time T spanning from the timing t 0 for the command pulse fall to the timing t, for the start of the fuel injection is found in accordance with the functional relation, which has been experimentally.
- the initial injection rating or the early portion of the injection rating q, increases linearly. Consequently, it will be said that the initial quantity of fuel injected, or the quantity of fuel injected during an early preselected duration after the start of the fuel injection, and the initial fuel-injection rating are in proportional relation with the rate of change, or a fixed slope, of the fuel-injection rating.
- the initial fuel-injection rating, or the early portion of the fuel-injection rating q, as well as the rate k 1 of change thereof become greater in value at a timing t 1 for the actual fuel injection, or another start-delay time T 1 no later than the start-delay time T and, therefore, the quantity of fuel injected no later than a preselected length of time increases in proportion to the rate of change.
- the initial injection rating as well as the rate k 2 of change thereof become less in value at a timing t 2 for the actual fuel injection, or another start-delay time T 2 later than the start-delay time T and, therefore, the quantity of fuel injected later than a preselected length of time made less in proportion to the rate k 2 of change.
- FIGS. 1 and 2 are to explain the processing procedure in the fuel-injection system of the present invention.
- the processing step in FIGS. 1 will be referred to as a letter "S" hereinafter.
- Sensors for monitoring includes a tachometer monitoring the engine rpm and an accelerator pedal depression sensor monitoring the engine load.
- the engine rpm Ne and the engine load Ac are detected (S1).
- a desired quantity Q 0 of fuel injected per cycle is found, in compliance with the engine rpm Ne and the engine load Ac transmitted from the associated sensors, on a lookup map A in which is previously defined a correlation of the desired quantity Q 0 of fuel injected with the engine rpm Ne and the engine load Ac (S2).
- a desired common-rail pressure Pf is found on a lookup map B, which is also defined previously, in compliance with the engine rpm Ne and the desired quantity Q 0 of fuel injected, which has been found on the map A.
- the desired common-rail pressure Pf is signaled to the controller unit, which in turn controls both the high-pressure fuel pump 8 and the flow-rate control valve 14 to thereby make the desired common-rail pressure Pf of an actual common-rail pressure.
- a lookup map C is previously defined, in which the correlation among the desired quantity Q 0 of fuel injected, the engine rpm Ne and a desired rate k 0 of change of the initial fuel-injection rating, or the second differential of the initial fuel injection rating in terms of the time, is plotted at the subject of smoke emission control and specific fuel consumption on such event that it is not permitted to achieve the noise control or the exhaust gas circulation of the engine.
- the lookup map C corresponds to the first mapped data of the present invention.
- a desired rate k 0 of change of the initial fuel-injection rating is defined on the lookup map C in compliance with the desired quantity Q 0 calculated above and the engine rpm Ne detected (S3).
- a pull-in voltage Vp or a pull-in current Ip to be applied to the actuator of the injector 1 is found in compliance with the rate k 0 of change, found at the (S3), on a lookup map D, which is also defined previously (S4).
- the lookup map D corresponds to the second mapped data according to the present invention, in which the pull-in voltage Vp is found for the actuator of the piezoelectric elements while the pull-in current Ip is for the solenoid-operated actuator.
- a command pulse width Pw making the quantity of fuel injected conform with the desired quantity Q 0 of fuel injected is determined based on a three-dimensional lookup map E in which the desired quantity Q 0 of fuel injected, the command pulse width Pw and the pull-in voltage Vp or current Ip are plotted with the desired common-rail pressure Pf as a parameter (S5).
- the injector driver is energized with the pull-in voltage Vp or current Ip found at the (S4) and the command pulse of the pulse width Pw determined at the (S5) thereby to carry out the actual fuel injection (S6).
- the lookup map E may be of a two-dimensional map of the desired quantity Q 0 and the command pulse width Pw plotted in accordance with several pull-in voltages Vp or currents Ip.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Claims (6)
- Système d'injection de carburant à rail commun, comprenant des injecteurs (1) pour pulvériser du carburant dans les chambres de combustion d'un moteur, un rail commun (2) accumulant dans celui-ci le carburant qui doit être appliqué aux injecteurs (1), une pompe de carburant haute pression (8) pour délivrer le carburant au rail commun (2), des moyens de détection pour surveiller les conditions de fonctionnement du moteur, et une unité de commande (12) pour réguler l'injection du carburant hors des injecteurs (1) en conformité avec les signaux renvoyés depuis les moyens de détection,
dans lequel les injecteurs (1) incluent chacun une chambre de commande de pression (40) recevant une partie du carburant délivré depuis le rail commun (2), une soupape à pointeau (24) déplaçable vers le haut et vers le bas, en fonction de l'action hydraulique du carburant dans la chambre de commande de pression (40), pour en conséquence ouvrir et fermer les orifices de décharge (25) à une extrémité distale de l'injecteur (1), une soupape (42) pour permettre au carburant d'être déchargé de la chambre de commande de pression (40) aboutissant de ce fait à un allègement de la pression du carburant dans la chambre de commande de pression (40), et un organe de commande (65) pour diriger la soupape (42),
dans lequel l'unité de commande (12) produit un signal d'excitation, en conformité avec les signaux transmis depuis les moyens de détection, pour exciter l'organe de commande (65) qui à son tour régule une surface d'ouverture de la soupape aboutissant de ce fait à la commande de l'injection de carburant hors des injecteurs (1), et
caractérisé en ce que l'unité de commande (12) mémorise en son sein des premières données mappées d'une corrélation définie antérieurement entre une variable initiale commandée de l'injection de carburant à une partie précédente de l'injection de carburant et une quantité désirée de carburant injecté, et mémorise en son sein des secondes données mappées d'une corrélation définie antérieurement parmi une pression du rail commun désirée (Pf), la variable initiale commandée de l'injection de carburant et le signal d'excitation, trouvant de ce fait, sur la base des signaux transmis depuis les moyens de détection, la quantité désirée de carburant injecté et la pression du rail commun désirée (Pf) correspondant à la quantité désirée de carburant injecté, trouvant dans les premières données mappées la variable initiale commandée de l'injection de carburant en conformité avec la quantité désirée de carburant injecté, et calculant sur les secondes données mappées le signal d'excitation correspondant à la variable initiale commandée de l'injection de carburant. - Système d'injection de carburant à rail commun selon la revendication 1, dans lequel l'organe de commande (65) est constitué d'éléments piézoélectriques et le signal d'excitation est une tension d'excitation qui doit être appliquée aux éléments piézoélectriques.
- Système d'injection de carburant à rail commun selon la revendication 1, dans lequel l'organe de commande (65) est constitué d'un électroaimant électromagnétique et le signal d'excitation est un signal parmi une tension d'excitation et un courant d'excitation qui doit être appliqué à l'électroaimant électromagnétique.
- Système d'injection de carburant à rail commun selon la revendication 1, dans lequel la soupape commandée par l'organe de commande (42) est constituée d'une soupape à levée verticale pour ouvrir et fermer une sortie d'un trajet de fuite de carburant (41) à travers lequel le carburant s'écoule hors de la chambre de commande de pression (40).
- Système d'injection de carburant à rail commun selon la revendication 1, dans lequel la soupape commandée par l'organe de commande (42) est constituée d'une soupape à champignon, laquelle comprend une tige de soupape s'étendant à travers le trajet de fuite du carburant (41) permettant au carburant de s'écouler hors de la chambre de commande de pression (40), et une tête de soupape montée sur la tige de soupape du côté de la chambre de commande de pression (40) et comportant une face de soupape pour établir un contact avec un siège de soupape formé à l'entrée du trajet de fuite de carburant (41).
- Système d'injection de carburant à rail commun construit selon la revendication 1, dans lequel la variable initiale commandée de l'injection de carburant est un élément parmi une quantité initiale de carburant injecté, un débit d'injection de carburant initial et une vitesse de changement du débit d'injection de carburant initial.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19348898 | 1998-07-08 | ||
JP10193488A JP2000027725A (ja) | 1998-07-08 | 1998-07-08 | コモンレール式燃料噴射装置 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0971119A2 EP0971119A2 (fr) | 2000-01-12 |
EP0971119A3 EP0971119A3 (fr) | 2002-02-13 |
EP0971119B1 true EP0971119B1 (fr) | 2004-09-22 |
Family
ID=16308879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19990305441 Expired - Lifetime EP0971119B1 (fr) | 1998-07-08 | 1999-07-08 | Système d'injection de combustible à rampe commune |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0971119B1 (fr) |
JP (1) | JP2000027725A (fr) |
DE (1) | DE69920338T2 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107208584A (zh) * | 2015-01-20 | 2017-09-26 | 株式会社电装 | 燃料喷射阀的控制装置 |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6079641A (en) | 1998-10-13 | 2000-06-27 | Caterpillar Inc. | Fuel injector with rate shaping control through piezoelectric nozzle lift |
DE19936944A1 (de) * | 1999-08-05 | 2001-02-08 | Bosch Gmbh Robert | Verfahren zum Zumessen von Brennstoff mit einem Brennstoffeinspritzventil |
DE10014737A1 (de) | 2000-03-24 | 2001-10-11 | Bosch Gmbh Robert | Verfahren zur Bestimmung des Raildrucks eines Einspritzventils mit einem piezoelektrischen Aktor |
DE10044120A1 (de) * | 2000-09-07 | 2002-04-04 | Bosch Gmbh Robert | Common-Rail-System |
FR2823534B1 (fr) | 2001-04-12 | 2003-10-03 | Power System | Procede pour augmenter la puissance et le couple d'un moteur diesel a systeme d'injection et dispositif pour la mise en oeuvre du procede |
DE10205749A1 (de) * | 2002-02-12 | 2003-08-21 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
DE10231582A1 (de) * | 2002-07-11 | 2004-01-29 | Daimlerchrysler Ag | Verfahren zum Betrieb einer Brennkraftmaschine |
DE10239614A1 (de) * | 2002-08-29 | 2004-03-11 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Kraftstoffeinspritzsystems, Computerprogramm sowie Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems und Brennkraftmaschine |
DE102007053156A1 (de) * | 2007-11-08 | 2009-05-20 | Man Diesel Se | Kraftstoffeinspritzeinrichtung |
JP5358621B2 (ja) | 2011-06-20 | 2013-12-04 | 日立オートモティブシステムズ株式会社 | 燃料噴射装置 |
JP5857980B2 (ja) * | 2013-02-06 | 2016-02-10 | 株式会社日本自動車部品総合研究所 | 電磁弁 |
WO2019109825A1 (fr) * | 2017-12-07 | 2019-06-13 | 天津盛欧美发动机技术有限公司 | Injecteur de carburant à rail commun pour moteur diesel |
CN113202669B (zh) * | 2021-06-10 | 2022-07-15 | 哈尔滨工程大学 | 一种电控喷油器性能的多目标优化方法 |
CN114165373A (zh) * | 2021-12-17 | 2022-03-11 | 中国船舶重工集团公司第七一一研究所 | 喷油器和共轨*** |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5133645A (en) * | 1990-07-16 | 1992-07-28 | Diesel Technology Corporation | Common rail fuel injection system |
ES2135815T3 (es) * | 1995-05-03 | 1999-11-01 | Daimler Chrysler Ag | Tobera de inyeccion. |
JP3823391B2 (ja) * | 1996-08-31 | 2006-09-20 | いすゞ自動車株式会社 | エンジンの燃料噴射装置 |
JP3653882B2 (ja) * | 1996-08-31 | 2005-06-02 | いすゞ自動車株式会社 | エンジンの燃料噴射装置 |
-
1998
- 1998-07-08 JP JP10193488A patent/JP2000027725A/ja active Pending
-
1999
- 1999-07-08 DE DE1999620338 patent/DE69920338T2/de not_active Expired - Fee Related
- 1999-07-08 EP EP19990305441 patent/EP0971119B1/fr not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107208584A (zh) * | 2015-01-20 | 2017-09-26 | 株式会社电装 | 燃料喷射阀的控制装置 |
Also Published As
Publication number | Publication date |
---|---|
DE69920338T2 (de) | 2005-10-06 |
JP2000027725A (ja) | 2000-01-25 |
EP0971119A3 (fr) | 2002-02-13 |
EP0971119A2 (fr) | 2000-01-12 |
DE69920338D1 (de) | 2004-10-28 |
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