CN1435561A - Pressure-accumulating jet system - Google Patents

Pressure-accumulating jet system Download PDF

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Publication number
CN1435561A
CN1435561A CN03102188A CN03102188A CN1435561A CN 1435561 A CN1435561 A CN 1435561A CN 03102188 A CN03102188 A CN 03102188A CN 03102188 A CN03102188 A CN 03102188A CN 1435561 A CN1435561 A CN 1435561A
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CN
China
Prior art keywords
fuel
duration
pressure
fuel injection
pumping
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Granted
Application number
CN03102188A
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Chinese (zh)
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CN100497917C (en
Inventor
中村兼仁
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Denso Corp
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Denso Corp
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Priority claimed from JP2002023828A external-priority patent/JP4026368B2/en
Priority claimed from JP2002023607A external-priority patent/JP3969104B2/en
Application filed by Denso Corp filed Critical Denso Corp
Publication of CN1435561A publication Critical patent/CN1435561A/en
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Publication of CN100497917C publication Critical patent/CN100497917C/en
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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
    • 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
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • 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
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/406—Electrically controlling a diesel injection pump
    • 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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/225—Leakage detection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • 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
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The pressure is applied to the fuel filled in each air cylinder of an engine (1) by a fuel ejected valve (5) via a fuel feed pump (3). A engine control unit (10) sets a signal for driving the fuel ejected valve (5), such that the difference of the fuel ejected amount between both instances is prevented, wherein one instance is that, a pump feed duration of the fuel feed pump (3) and an ejecting duration of the fuel ejected valve (5) in air cylinder are overlapped, the other is that, a pump feed duration of the fuel feed pump (3) and an ejecting duration of the fuel ejected valve (5) in air cylinder are not overlapped. In the front instance, the time overlapped part is determined as a time when the pump feed duration and the fuel ejected duration are overlapped. If the time overlapped part is changed, the engine control unit (10) sets a signal for for driving the fuel ejected valve (5) based on the time overlapped part.

Description

Pressure-accumulating jet system
Invention field
The present invention relates to a kind of being used in the accumulator stored, be used for to accumulate in high-pressure fuel supply in the accumulator in each cylinder such as the internal-combustion engine of multi-cylinder diesel engine by Fuelinjection nozzle by pressure-accumulating jet system such as the fuel under high pressure that fuel facility discharged of supply pump.
Background technique
For the universal fuel ejecting system such as the internal-combustion engine of multi-cylinder diesel engine, known pressure-accumulating jet system comprises rail (common rail), a plurality of Fuelinjection nozzle and a supply pump altogether.Described rail altogether is used as accumulator, is used for fuel is carried out storing fuel under high pressure under supercharging and the pressure in injecting fuel into the cylinder of motor.Described Fuelinjection nozzle is the electromagnetic fuel injector on a kind of each cylinder that is installed in motor.Supply pump is used as fuel injection pump, and the fuel that is used in the pressure chamber that enters fuel injection pump from fuel tank by the pump solenoid valve is exerted pressure, and is used for when being total to rail fuel supplying (discharge fuel just) fuel being pressurizeed.
Yet in common pressure-accumulating jet system, the burner oil duration of Fuelinjection nozzle and the pumping duration of supply pump are overlapping, at overlapping period, jet pressure and fuel injection rate are higher during nonoverlapping than the pumping duration of burner oil duration of Fuelinjection nozzle and supply pump.Therefore actual fuel injection quantities is increased to a value, and this value surpasses according to the set target fuel injection amount of engine operational conditions.The pumping duration of supply pump is confirmed as the time between pumping duration start-phase and the pumping duration end phase place.Fuel duty is meant the volume that is ejected into the fuel in the cylinder.
Under the synchronous injection situation of spraying such as each pumping operation once, according to the end phase place of pumping duration, the fuel of Fuelinjection nozzle sprays the duration may be overlapping with the pumping duration of supply pump, also may be not overlapping.Spraying such as each pumping operation twice or four pumping operations spray under six times the synchronous injection situation, the fuel injection duration of the Fuelinjection nozzle of some cylinder and the pumping duration of supply pump are overlapping, and the fuel injection duration of the Fuelinjection nozzle of some cylinder and the pumping duration of supply pump are not overlapping.
Therefore it is different with fuel duty under not overlapping situation to spray the fuel duty in the injected engine cylinder of setting out under the overlapping situation of pumping duration of duration and supply pump at the fuel of Fuelinjection nozzle, this produces harmful effect, supply precise decreasing to the fuel injection amount control accuracy.
On the other hand, a kind of pressure-accumulating jet system has following structure, wherein in order to obtain the common rail fuel pressure of target, adjusts the conduction current that flows to pump control valve, thus the volume of fuel that the control pump output is just controlled fuel injection pump and discharged.Determine that according to the size of the conduction current that flows to pump control valve the method for pump output is known, promptly, set the pump output of fuel injection pump institute discharge fuel by adjusting the opening of pump control valve.Therefore can think that the size of the conduction current that flows to pump control valve is the instruction pump output.Yet the method for determining pump output according to the size of the conduction current that flows to pump control valve causes error by following factor easily, and described factor comprises fuel injection pump, comprises the fuel condition of viscosity and the difference between the air.Thereby occur the problem of low precision of definite pump output.
When the pump live axle of fuel injection pump and the crankshaft of motor rotate synchronously,, also can not find even error appears in fuel injection pump assembly and engine crankshaft.The error of supply of fuel pump assembly and engine crankshaft causes such problem, and is even just know the time-interleaving part according to narration, experiment or similar fashion in advance, also very little to the calibration result that fuel sprays according to above-mentioned time-interleaving part.
Summary of the invention
An object of the present invention is to provide a kind of pressure-accumulating jet system, by eliminating the difference of the fuel injection amount between nonoverlapping cylinder of pumping duration that fuel at Fuelinjection nozzle sprays fuel injection duration of overlapping cylinder of duration and the pumping duration of supply pump and Fuelinjection nozzle and supply pump, improve the control accuracy of the fuel injection amount of each cylinder of motor.
Another object of the present invention provides a kind of pressure-accumulating jet system, spray under the overlapping situation of pumping duration of duration and supply pump by the fuel of eliminating Fuelinjection nozzle in specific cylinder and in identical specific cylinder the difference of the fuel injection amount between under the not overlapping situation of pumping duration of fuel injection duration of Fuelinjection nozzle and supply pump, can improve the control accuracy of the fuel injection amount of the specific cylinder of motor.
Another object of the present invention provides a kind of pressure-accumulating jet system, can detect the cam phase (cam phase) of fuel injection pump, specifically, start-phase and the pumping duration that can detect the pumping duration accurately finish phase place, can utilize this detected phase place in the engine control of carrying out subsequently.
Another object of the present invention provides a kind of pressure-accumulating jet system, and the fuel that can detect Fuelinjection nozzle accurately sprays the time-interleaving part between pumping duration of duration and fuel injection pump.
Another object of the present invention provides a kind of pressure-accumulating jet system, the time-interleaving part between the fuel injection duration of based on fuel injection valve and the pumping duration of fuel injection pump, correction fuel emitted dose accurately.
Another object of the present invention provides a kind of pressure-accumulating jet system of pump output of the supply pump of computing fuel accurately.
Another object of the present invention provides a kind of pressure-accumulating jet system that can detect the fuel injection pump assembly error.
According to the present invention, spray overlapping cylinder and the fuel injection duration of Fuelinjection nozzle and nonoverlapping cylinder of pumping duration of fuel injection pump of pumping duration of duration and fuel injection pump if know the fuel of Fuelinjection nozzle in advance, can spray the duration from the fuel that sprays nonoverlapping cylinder of pumping duration of duration and fuel injection pump according to the fuel of finding Fuelinjection nozzle target fuel injection amount that is provided with according to engine operational conditions and the detected fuel pressure of fuel pressure detection device.On the other hand, can spray the time-interleaving part of the pumping duration of duration and fuel injection pump according to the fuel of target fuel injection amount, detected fuel pressure, Fuelinjection nozzle, the fuel of the cylinder that the fuel injection duration of discovery Fuelinjection nozzle and the pumping duration of fuel injection pump are overlapping sprays the duration.
Therefore, the fuel that can reduce Fuelinjection nozzle sprays the difference of the fuel injection amount between the not overlapping cylinder of pumping duration of fuel injection duration of overlapping cylinder of duration and the pumping duration of fuel injection pump and Fuelinjection nozzle and fuel injection pump.In addition, the difference that can contain the burning capacity between each cylinder of motor.Can contain that in addition jet performance descends.
According to the present invention, for certain specific cylinder of motor, can reduce under this cylinder sprays duration and fuel injection pump at the fuel of Fuelinjection nozzle the overlapping situation of pumping duration and the difference between the actual fuel injection quantities under the not overlapping situation of pumping duration of fuel injection duration of Fuelinjection nozzle and fuel injection pump.
According to the present invention, the moment that the variation of finding the detected fuel pressure of fuel pressure detection device surpasses a predetermined value is considered to a kind of like this moment, promptly this moment fuel injection pump cam phase can be considered to the start-phase of pumping duration.After surpassing this predetermined value, the variation of finding the detected fuel pressure of fuel pressure detection device is considered to a kind of like this moment less than the moment of this predetermined value, promptly this moment fuel injection pump cam phase can be considered to the end phase place of pumping duration.Another kind of scheme is that the end phase place of how much pumping durations is stored in the engine assembly of fuel injection pump.Adopt this mode, can determine the cam phase of fuel injection pump accurately, specifically, start-phase that can high-precision definite pumping duration and the end phase place of pumping duration.
The end phase place of the start-phase of pumping duration and pumping duration is reflected in the control of motor, after the end phase place of start-phase that detects the pumping duration and pumping duration, carries out engine control.The example of engine control is fuel injection control and pump control.For example the fuel that can determine Fuelinjection nozzle according to start-phase and the end phase place of pumping duration of pumping duration sprays the time-interleaving part between pumping duration of duration and fuel injection pump.Can partly carry out fuel injection control according to this time-interleaving.According to the start-phase of pumping duration and the end phase place of pumping duration, can determine pump output accurately in addition.Can carry out pump control according to this pump output then.
According to the present invention, according to end phase place, target fuel injection duration and the target fuel injection timing of pumping duration, can really positive accurately time lap.
The start-phase of the cam profile of based on fuel supply pump (or cam phase or plunger position), pumping duration and the end phase place of pumping duration can determine to be pumped into from fuel injection pump the pump output of the fuel of accumulator inside exactly.
The dynamic leakage quantity of the static leakage quantity of the target pump output of based on fuel, nozzle and nozzle for example can be determined the fuel leak amount of high-voltage tube accurately.
For example when fuel leak quantity surpasses predetermined value, carry out the fuel injection control that is used to improve pump control.More particularly, in case for example the fuel injection pump appearance is undesired, Fuelinjection nozzle is opened undesired or the appearance of fuel pipe system is undesired, motor is out of service, or carries out fuel injection control or pump control, thereby guarantees the vehicle continuous motion.
For example, be desirable to provide electric controller, be used to handle the electrical signal that fuel pressure sensor produces with a low-pass filter and a high-pass filter.By this wave filter is provided, start-phase that can the high speed detection pumping duration and the end phase place of pumping duration.
For example, finish the phase difference between the reference position of phase bit position and pumping duration end phase place, can detect the deviation of the angle of revolution of the cam of fuel injection pump and engine output shaft by determining the detected pumping duration.Therefore can detect the assembling phase place of fuel injection pump accurately.
Brief description
Fig. 1 is a Block Diagram, has shown the common rail fuel injection system that meets first embodiment of the invention;
Fig. 2 is that a representative is used for determining that the first embodiment of the invention basic fuel sprays the chart of the characteristic pattern of duration;
Fig. 3 is that a representative is used for determining that the first embodiment of the invention basic fuel sprays the chart of the characteristic pattern of duration;
Fig. 4 is a flow chart, the fuel injection control that the expression first embodiment of the invention is carried out;
Fig. 5 is a flow chart, the fuel injection control that the expression second embodiment of the invention is carried out;
Fig. 6 is a flow chart, the fuel injection control that the expression second embodiment of the invention is carried out;
Fig. 7 is a characteristic pattern, is used for determining the correction mass of second embodiment of the invention;
Fig. 8 is a flow chart, the fuel injection control that the expression third embodiment of the invention is carried out;
Fig. 9 is a flow chart, the fuel injection control that the expression third embodiment of the invention is carried out;
Figure 10 is a characteristic pattern that is used for the pump discharge amount of definite third embodiment of the invention;
Figure 11 is compiling of an oscillogram, and described oscillogram is to spray relevant time chart with fuel among the 3rd embodiment;
Figure 12 is a characteristic pattern that is used for the correction mass of definite third embodiment of the invention;
Figure 13 is a flow chart, is illustrated in the process that detects the phase place of fuel injection pump in the fourth embodiment of the invention;
Figure 14 is a flow chart, is illustrated in the process of determining fuel leak in the fifth embodiment of the invention;
Figure 15 shows the sequential chart of the performed operation of fuel injection pump in the fifth embodiment of the invention;
Figure 16 is a characteristic pattern of determining the static leakage amount in fifth embodiment of the invention;
Figure 17 is a characteristic pattern that is used for the correction mass of definite fifth embodiment of the invention;
Figure 18 is a characteristic pattern of determining the dynamic leakage amount in fifth embodiment of the invention;
Figure 19 has shown the sequential chart of common rail fuel variation in pressure in fifth embodiment of the invention;
Figure 20 is a chart that shows the distribution of fuel consumption in the fifth embodiment of the invention;
Figure 21 is a Block Diagram, has shown the engine controlling unit in the sixth embodiment of the invention;
Figure 22 has shown the oscillogram of the sequential chart of common rail fuel pressure in the expression sixth embodiment of the invention.
Preferred embodiment is introduced
Hereinafter will introduce the preferred embodiment of the present invention in conjunction with the accompanying drawings.(first embodiment)
Fig. 1～4 have shown the first embodiment of the present invention, and Fig. 1 is a Block Diagram, has shown a kind of common rail fuel injection system.
A kind of common rail fuel injection system is used on the motor such as 4 cylinder diesels.Common rail fuel injection system comprises the common rail 2 that is used as accumulator, in described altogether rail 2, fuel under high pressure by accumulate to fuel can be sprayed each cylinder in the identical pressure of fueling injection pressure.Common rail fuel injection system also has a fuel injection pump 3, is used for exerting pressure to the fuel that is absorbed, and the fuel-pumping after will pressurizeing then is to being total in the rail 2.Common rail fuel injection system also has a plurality of electromagnetic fuel injectors 5, and the fuel under high pressure that is used for being stored in the common rail 2 is provided in the cylinder of motor 1.Usually motor 1 has 4 cylinders.Hereinafter described electromagnetic fuel injector 5 is called nozzle.Common rail fuel injection system also is equipped with the electric control device 10 that is used to control fuel injection pump 3 and electromagnetic fuel injector 5.Hereinafter, for the purpose of simplifying the description, electric control device 10 is called ECU.
Must be continuously in rail altogether, fuel be pressurizeed and equal fuel-in-storage under the pressure of fueling injection pressure one.Utilize pressure duct 11,3 pairs of fuel of use fuel injection pump pressurize and are being total to rail stored fuel under high pressure.In a drainage pipe 14 that is used for fuel is discharged into from rail 2 altogether fuel tank 7 in, be provided with one and be used to avoid the voltage limiter 13 of high pressure, thereby stop fuel pressures in the rail 2 altogether above a setting pressure limiting value.
The fuel injection pump 3 that is called supply pump for short is one and is used for to the pump that is total to rail 2 fuel supplying.3 pairs of fuel of fuel injection pump pressurize and fuel are discharged in the common rail 2 from exhaust outlet.Fuel injection pump 3 has the pump live axle 16 of bent axle 15 drivings of a launched machine 1.Fuel injection pump 3 also is equipped with one to be used for from the transfer pump of fuel tank 7 pump fuel when being driven by pump live axle 16.This transfer pump is the low-pressure fuel supply pump.
Fuel injection pump 3 comprises a cam, one or more plunger and one or more cylinder in addition.Under the driving of pump live axle 16, this cam rotation.Under this action of cam, plunger seesaws in cylinder.Described plunger and cylinder form pressure and apply a chamber or a plunger cavity, are used to absorb fuel and exert pressure to the fuel that is absorbed.Fuel injection pump 3 also comprises an expulsion valve, and when the fuel pressure in pressure applies the chamber met or exceeded a predefined value, this expulsion valve was opened.In addition fuel injection pump 3 also be equipped with two each other phase difference be 180 ° plunger.
Fuel injection pump 3 also is equipped with a too high Leak hole of fuel temperature that is used to stop in the pump chamber.The fuel that leaks from this Leak hole returns fuel tank 7 by fuel return path 17 and 19.Pressure in connecting pump chamber and fuel injection pump 3 applies in the fuel passage in chamber, be equipped with the control valve (SCV) 4 of bleeding, be used to adjust the opening degree (or unlatching) of fuel passage, thereby change the fuel discharge amount (or pump displacement or pump amount) that flows to common rail 2 from fuel injection pump 3.SCV4 is a solenoid valve, is used as pump displacement modifier or pump amount modifier.
Utilize ECU10 by pump drive circuit not shown in the figures pump drive signal output electric control SCV4 to SCV4.SCV4 adjusts the pressure be pumped to fuel injection pump 3 and applies volume of fuel in the chamber.So SCV4 changes fueling injection pressure, and change the fuel pressure that is total in the rail 2.SCV4 is a kind of common open valve.When the electric current that flows to valve was cut off, this open valve was in the complete opening state.SCV4 also is known as the pump flow control valve.
In being total to rail 2, settle a plurality of branched pipes 12.Downstream at each branched pipe 12 is provided with a Fuelinjection nozzle 5.Each Fuelinjection nozzle 5 has a nozzle, an electromagnetic actuators and such as the pressurization device of spring, is used for forcing to exert pressure to nozzle needle along the valve closing direction.On nozzle, be formed with a spray-hole.Electromagnetic actuators drives nozzle needle along the opening of valves direction.
By allowing or do not allow the current direction solenoid electric valve to come Electromagnetic Control fuel to spray, this solenoid electric valve is used as the interior fuel pressure of back pressure control chamber that electromagnetic actuators is controlled nozzle needle.When the solenoid valve of Fuelinjection nozzle 5 was in opening state, Fuelinjection nozzle 5 sprayed fuel under high pressure in the cylinder relevant with Fuelinjection nozzle 5.The fuel that leaks out from Fuelinjection nozzle 5 and return fuel tank 7 by return path 18 and 19 from the fuel that the back pressure control chamber returns.
ECU10 comprises having known configurations, has the configuration of functions such as comprising CPU, storage device, input circlult, output circuit, energy supply circuit, nozzle drive circuit and pump drive circuit.Described CPU carries out the program such as control and normal operations.The storage device that is used to store distinct program and several data is ROM and/or RAM normally.The signal as the A/D operating result that sensor signal that different sensors produces and A/D converter produce is provided for microcomputer.
Common rail fuel injection system comprises that a cylinder determines device, and it comprises that a cylinder determines sensor 31.Cylinder determines that sensor 31 comprises a signal rotor, a plurality of cylinder tooth (or projection) and an electromagnetism wave detector.Signal rotor rotates with camshaft.For example when bent axle 15 rotated two circles, signal rotor rotated a circle.The cylinder tooth is set on the outer circumferential face of signal rotor, and each cylinder tooth is relevant with cylinder.The electromagnetism wave detector produces the cylinder that conforms to distance apart from the cylinder tooth and determines signal pulse.In particular, when the piston arrives one of first cylinder will be carried out the position of fuel injection at once, the output one basic cylinder with big pulse width was determined signal pulse.Then, when the piston arrives one of the 3rd cylinder will be carried out the position of fuel injection at once, output one cylinder with small-pulse effect width was determined signal pulse.Then, when the piston arrives one of four-cylinder will be carried out the position of fuel injection at once, output one cylinder with small-pulse effect width was determined signal pulse.Subsequently, when the piston arrives one of second cylinder will be carried out the position of fuel injection at once, output one cylinder with small-pulse effect width was determined signal pulse.These pulses are known as the G signal.
Common rail fuel injection system comprises that also a rotating speed determines device, and it comprises a crank angle degree sensor 32.Comprise crank angle degree sensor 32 signal rotor, a plurality of crank angle degree detect a tooth (or projection) and an electromagnetic detector.Signal rotor and crankshaft rotate synchronously.For example when signal rotor rotated a circle, bent axle 15 also rotated a circle.Crank angle degree detects tooth and is set on the outer circumferential face of signal rotor.Electromagnetic detector produces and detects tooth pitch from the NE signal pulse that conforms to apart from crank angle degree.When signal rotor rotated a circle, crank angle degree sensor 32 produced a plurality of NE signal pulses.By measuring the spacing between the described NE signal pulse, ECU10 determines the speed NE of motor.
Common rail fuel injection system comprises that also one is used to detect the throttle sensor 33 that accelerator pedal is opened ACCP.In addition, common rail fuel injection system comprises that also one is used for the cooling-water temperature sensor 34 of the cooling water temperature of detection of engine 1.Common rail fuel injection system comprises that also one is used to detect the fuel pressure sensor 35 of the fuel pressure Pc in the common rail 2 in addition.In addition, common rail fuel injection system comprises that also one is used to detect the fuel temperature sensor 36 of fuel temperature THF.
ECU10 determines to be suitable for the best common rail fuel pressure of motor 1 working state.ECU10 has the discharge amount control gear (or SCV control gear) that is used to drive SCV4.Specifically, according to the work state information of relevant motor 1, ECU10 determines target common rail fuel pressure P t.Described information comprises engine speed NE and accelerator pedal unlatching ACCP.ECU10 adjusts and is provided to the pump drive signal of SCV4, thereby makes common rail fuel pressure P c equal target common rail fuel pressure P t.The pump drive signal representative drives the size of current of SCV4 or the size of SCV conduction current.
The pump drive signal of wishing to be provided to SCV is transported to the SCV4 in feedback control, thereby makes common rail fuel pressure transducer 35 detected common rail fuel pressure P c equal target common rail fuel pressure P t.It is pointed out that as control, wish to carry out load control (duty control) the pump drive signal that is provided to SCV4.In other words, in load control,, adjust the duty ratio of pump drive signal, thereby change the unlatching of SCV4 according to target common rail fuel pressure P t.Use this mode, can carry out digital control accurately.Described duty ratio is confirmed as pump drive signal and opens the ratio that duration and pump drive signal are closed the duration.
ECU10 has a control gear, is used to carry out the fuel injection timing control of the Fuelinjection nozzle 5 that sprays duration control and be used for each cylinder.This control gear has fuel injection amount and the fuel injection timing is determined device, is used to determine to be suitable for the optimum target fuel injection amount Q (or conduction of current duration) and the fuel injection timing T (or conduction current elapsed time) of motor 1 operation.This control gear also has fuel and sprays the duration and determine device, and the running state, common rail fuel pressure P c and the target fuel injection amount Q that are used for according to motor 1 determine fuel jeting instruction phase Tq (or fuel jeting instruction pulse width or fuel jeting instruction pulse duration).This control gear has the Fuelinjection nozzle drive unit in addition, is used for applying pulsed fuel jet drive electric current (pulse of fuel jeting instruction) by a Fuelinjection nozzle drive circuit to the Fuelinjection nozzle 5 of each cylinder.
For example, ECU10 determines to be suitable for the target fuel injection amount Q of a motor 1 running state.In the case, utilize engine speed NE, acceleration unlatching ACCP and water temperature T HW to represent the running state of motor.Then, according to common rail fuel pressure P c and target fuel injection amount Q, ECU10 determines fuel jeting instruction pulse duration Tq.
The running state detecting device that is used for detection of engine 1 running state can comprise one enter air flow sensor, enter air temperature sensor, enter air pressure probe, fuel temperature sensor and fuel injection amount sensor.According to the signal that these sensors produced, can correction target fuel injection amount Q, fuel injection timing T and target common rail fuel volume Pt.
In this embodiment's common rail fuel injection system, each pumping operation carries out twice fuel and sprays.It is overlapping that the fuel of the Fuelinjection nozzle 5 of the pumping operation duration of pump fuel and second cylinder sprays the duration by first plunger that promotes fuel injection pump 3.In addition, the fuel of the Fuelinjection nozzle 5 of the pumping operation duration of pump fuel and the 3rd cylinder injection duration is overlapping by second plunger that promotes fuel injection pump 3.First and the fuel of each Fuelinjection nozzle 5 of four-cylinder to spray the duration not overlapping with any pumping duration.Fuel injection pump 3 links to each other with motor 1, thereby forms the above-mentioned relation between fuel injection duration and pumping duration.
ECU10 among this embodiment controls, thereby containment pumping duration and fuel spray the difference of the fuel injection amount between overlapping cylinder of duration and pumping duration and the fuel injection nonoverlapping cylinder of duration.More particularly, in order to carry out this control, ECU10 has first and second fuel and sprays the duration and determine device.First fuel sprays the duration and determines that device sprays duration Tqa according to the first basic fuel that the first essential characteristic figure shown in Figure 2 seeks pumping duration and fuel injection nonoverlapping cylinder of duration.Being suitable for the pumping duration of the first essential characteristic figure and fuel, to spray nonoverlapping cylinder of duration be first and four-cylinder.On the other hand, second fuel sprays the duration and determines that device seeks the second basic fuel injection duration Tqb that pumping duration and fuel spray overlapping cylinder of duration according to the second essential characteristic figure shown in Figure 3.The pumping duration and the fuel injection overlapping cylinder of duration that are suitable for the first essential characteristic figure are the 3rd and second cylinders.It is pointed out that shown in Fig. 2 and 3 the second basic fuel that is suitable for target fuel injection amount Q sprays duration Tqb and sprays duration Tqa weak point than the first basic fuel that is suitable for same target fuel injection amount Q.
Hereinafter will introduce the controlling method of the fuel injection amount of Fuelinjection nozzle among this embodiment.Fig. 4 is the flow chart of a reactive fuel emitted dose control.After opening ignition switch not shown in the figures, the flow process of flow process representative shown in Figure 4 was carried out repeatedly in the predetermined moment.
Flow chart begins in step S1, judges whether the crank angle degree of motor 1 is consistent with the control reference position of the fuel injection amount that is used to control the Fuelinjection nozzle 5 that is installed on the designated cylinders, and this designated cylinders that is to say to be k cylinder.If judged result is No, control operation turns back to caller.For example, be installed in Fuelinjection nozzle 5 on k the cylinder fuel injection amount control can the previous circuit fuel AEI After End of Injection of Fuelinjection nozzle 5 will begin in a minute on k the cylinder being installed in.Another kind of scheme is, the fuel injection amount that is installed in Fuelinjection nozzle 5 on k the cylinder is controlled and can be in being installed in same circulation is positioned at before k the cylinder and the fuel AEI After End of Injection that is close to the Fuelinjection nozzle 5 on the cylinder of k cylinder will begin in a minute according to injection order.If k cylinder is first cylinder, be positioned at before k the cylinder and the cylinder that is close to k cylinder is second cylinder according to injection order.If k cylinder is the 3rd cylinder, be positioned at before k the cylinder and the cylinder that is close to k cylinder is first cylinder according to injection order.If k cylinder is four-cylinder, be positioned at before k the cylinder and the cylinder that is close to k cylinder is the 3rd cylinder according to injection order.If k cylinder is second cylinder, be positioned at before k the cylinder and the cylinder that is close to k cylinder is a four-cylinder according to injection order.
On the other hand, if be Yes in step S1 institute judged result, control flow enters step S2, in this step, and input such as G signal, Ne signal and quicken to open the engine signal of ACCP signal.Specifically, need obtain the Ne signal and quicken to open the ACCP signal in order to seek target fuel injection amount Q and target fuel injection timing T.At next procedure S3, open the ACCP signal then, determine target fuel injection amount Q according to Ne signal and acceleration.At step S4, open the ACCP signal then, determine target fuel injection timing T according to Ne signal and acceleration.At next step S5, import common rail fuel pressure P c then.
Control flow enters step S6 subsequently, according to G and NE signal, determines k the cylinder that fuel will be injected advances in this step.Control flow enters step S7 then, judges that whether at determined k the cylinder of step S6 be a pumping duration and overlapping cylinder of fuel injection duration or pumping duration and fuel injection nonoverlapping cylinder of duration.If judged result is negative, if just k cylinder is not overlapping cylinder, i.e. pumping duration and fuel spray nonoverlapping cylinder of duration, and control flow enters step S8.At step S8, use reaction target fuel injection amount Q, common rail fuel pressure P c and the first basic fuel to spray the first essential characteristic figure that concerns between the duration Tqa, determine that the first basic fuel sprays duration Tqa.Root is common, tests the result in advance factually and obtains the above-mentioned first essential characteristic figure.In this embodiment, to spray nonoverlapping cylinder of duration be first and four-cylinder for pumping duration and fuel.Control flow enters step S10 then.
On the other hand, if the judged result that step S7 is obtained is Yes, if just k cylinder is an overlapping cylinder, i.e. pumping duration and fuel spray overlapping cylinder of duration, and control flow enters step S9.At step S9, use reaction target fuel injection amount Q, common rail fuel pressure P c and the second basic fuel to spray the second essential characteristic figure that concerns between the duration Tqb, determine that the second basic fuel sprays duration Tqb.Usually, obtain the above-mentioned second essential characteristic figure according to experimental result in advance.In this embodiment, pumping duration and fuel injection overlapping cylinder of duration is the 3rd and second cylinder.It is to be noted that as another kind of scheme for the time-interleaving part t that calculates, i.e. pumping duration and fuel spray overlapping part of duration, determine that the second basic fuel sprays duration Tqb.
Control flow from step S8 or S9 enters step S10, and in this step, target fuel injection timing T is converted into final fuel injection timing TFIN.The final in addition fuel injection timing TFIN and the first basic fuel spray duration Tqa or the second basic fuel injection duration Tqb is converted into the fuel injection amount command value, just an opening of valves command value and a valve out code value.Set this fuel injection amount command value at output stage then.At next step S11, represent the Fuelinjection nozzle fuel jeting instruction pulse of fuel injection amount command value to be output to the solenoid valve of the Fuelinjection nozzle 5 of k cylinder, thereby drive the Fuelinjection nozzle 5 of k cylinder then.Control flow returns caller then.
According to first embodiment, the difference that can reduce the fuel that sprays overlapping cylinder and spray the fuel injection amount between the fuel of overlapping cylinder not.In other words, the output of cylinder is adjusted to identical degree.Therefore can contain the change of motor and discharging.
Two or more first essential characteristic Tqa Q Pc figure and two or more second essential characteristic Tqa Q Pc figure can be provided.For example, for the different overlapping degrees between fuel injection duration and pumping duration, can provide a plurality of first essential characteristic Tqa Q Pc figure and/or a plurality of second essential characteristic Tqa Q Pc figure.
Hereinafter will introduce other a plurality of embodiments of the present invention, introduce these embodiments and first embodiment's difference.In introducing hereinafter, use the same reference numerals to represent and first embodiment's components identical, but similar elements no longer is introduced.(second embodiment)
In a second embodiment, only use an essential characteristic figure.Essential characteristic figure is used to seek not, and the first basic fuel of overlapping cylinder sprays duration Tqa.According to real time lap t, the first basic fuel is sprayed duration Tqa proofread and correct, thereby the second basic fuel of determining overlapping cylinder sprays duration Tqb.
More particularly, use a kind of being used for that the first basic fuel of overlapping cylinder is not sprayed the correcting device that duration Tqa proofreaies and correct, the second basic fuel of change first basic fuel injection duration Tqa and overlapping cylinder sprays the difference between the duration Tqb, or use a kind of being used for that the second basic fuel is sprayed the correcting device that duration Tqb proofreaies and correct, change the difference between the second basic fuel injection duration Tqb and the first basic fuel injection duration Tqa, thereby it is shorter than the first basic fuel injection duration Tqa to make the second basic fuel spray duration Tqb.In addition, utilize one to proofread and correct quantity Δ Tq, correcting device sprays duration Tqa to the first basic fuel and proofreaies and correct, so that change the difference between the first basic fuel injection duration Tqa and the second basic fuel injection duration Tqb, or the second basic fuel is sprayed duration Tqb proofread and correct, spray difference between the duration Tqb and the first basic fuel injection duration Tqa so that change the second basic fuel.
For example, spray duration Tqa and proofread and correct quantity Δ Tq, set the second basic fuel and spray duration Tqb according to the first basic fuel.Utilize a setting device, provide and proofread and correct quantity Δ Tq.This setting device can be provided for another correction quantity that one of non-overlapped cylinder is proofreaied and correct quantity and is used for overlapping cylinder.This setting device can provide with pumping duration and fuel and spray the correction quantity Δ Tq that the time-interleaving part t between the duration conforms to.For example, this setting device can provide the correction quantity Δ that conforms to common rail fuel pressure P c with time-interleaving part t Tq.Can utilize a detection device to provide time-interleaving part t.According to the actual pumping duration (=PSTART-PEND) and actual quantity spray duration Tq, provide time-interleaving part t.By monitoring the typical change of common rail fuel pressure P c, can detect the actual pumping duration (=PSTART-PEND).
For example, can detect pumping duration zero-time PSTART and pumping duration concluding time PEND by common rail fuel pressure P c.The pumping duration, zero-time PSTART also was known as pumping duration start-phase, and pumping duration concluding time PEND also is known as pumping duration end phase place.It can be that expected value is replaced by a replacement value that actual quantity sprays duration Tq.For example, spray duration Tqa, can determine a value of spraying duration Tq near actual quantity according to the final fuel injection timing TFIN and the first basic fuel.Therefore, spray duration Tqa, detection device lap detection time t according to pumping duration zero-time PSTART, pumping duration concluding time PEND, final fuel injection timing TFIN and the first basic fuel.
Fig. 5,6 and 7 has shown the method that a kind of control fuel that is suitable for second embodiment sprays.In a second embodiment, the step S9 of flow chart shown in Figure 4 can be replaced by the step S12 in the flow chart shown in Figure 5, S13 and S14.In addition, can carry out step S21 new in the flow chart shown in Figure 6～S24.If fuel is an overlapping cylinder with the injected cylinder that advances, control flow chart enters step S12 from step S7.At step S12, utilize the first essential characteristic figure shown in Figure 2 to determine that the first basic fuel sprays duration Tqa.
Then at step S13, execute the program of flow chart representative shown in Figure 6 after, can determine the correction quantity Δ Tq of fuel injection amount.By using characteristic pattern shown in Figure 7, the correction quantity Δ Tq of fuel injection amount is determined.More particularly, utilize time-interleaving part t and common rail fuel pressure P c to determine the correction quantity Δ Tq of fuel injection amount.According to a series of experimental results, can obtain characteristic pattern shown in Figure 7 in advance.Proofread and correct quantity Δ Tq and be set to such value, it has reduced the fuel that sprays overlapping cylinder and injection and has advanced fuel injection amount difference between the fuel of overlapping cylinder not.Subsequently, in next step S14, spray duration Tqa correction down quantity Δ Tq with the first basic fuel, thereby the second basic fuel of determining overlapping cylinder sprays duration Tqb.In step S13, carry out the represented program of flow chart shown in Figure 6, thus hunting time lap t.
By monitoring common rail fuel pressure P c, ECU10 can detect pumping duration zero-time PSTART and pumping duration concluding time PEND.By analyzing the waveform of common rail fuel pressure P c, can seek pumping duration zero-time PSTART and pumping duration concluding time PEND.Also can seek pumping duration zero-time PSTART and pumping duration concluding time PEND by using the circuit that detects predetermined waveform.By using ECU10 to carry out the software of working procedure, also can determine pumping duration zero-time PSTART and pumping duration concluding time PEND.
Flow chart shown in Figure 6 starts from step S21, the pumping duration zero-time PSTART and the pumping duration concluding time PEND of the reference fuel injection timing of determined k cylinder in the most approaching step S6 at flow chart shown in Figure 5 of this step input.This pumping duration zero-time PSTART and pumping duration concluding time PEND are ECU10 detected pumping duration zero-time PSTART and pumping duration concluding time PEND in the previous circulation of k cylinder.Processing performed in step S21 is corresponding to a kind of device that is used to seek pumping duration zero-time PSTART and pumping duration concluding time PEND.Among pumping duration zero-time PSTART and the pumping duration concluding time PEND each is shown as rotation phase.Pumping duration zero-time PSTART is the moment that supply of fuel valve 3 is opened, and pumping duration zero-time PSTART is such moment, and at this constantly, the rising gradient of common rail fuel pressure P c reaches a predetermined value.Pumping duration zero-time PSTART spends the position of CA near (BTDC) before the second or the 3rd cylinder top dead center 78 corresponding to one usually.On the other hand, pumping duration concluding time PENDS is the moment that the plunger of fuel injection pump 3 reaches top dead center (maximum lift number of locations).Pumping duration concluding time PENDS is such moment, and at this constantly, the rising gradient of common rail fuel pressure P c drops under this predetermined value after surpassing predetermined value.Pumping duration concluding time PEND is corresponding to the common position of (ATDC) 48 degree CA after the top dead center near the second or the 3rd cylinder.
Then, in step S22, the first basic fuel that will search out in the step S12 of flow chart shown in Figure 5 sprays duration Tqa input.Subsequently, in next step S23, import final fuel injection timing TFIN.Then at next step S24, hunting time lap t.The actual pumping duration of fuel injection pump 3 is the differences (PEND-PSTART) between pumping duration zero-time PSTART and the pumping duration concluding time PEND.Utilize the final fuel injection timing TFIN and the first basic fuel injection duration Tqa to represent the actual pumping duration of supposing.At step S24, determine time-interleaving part t according to the actual pumping duration of actual pumping duration and supposition.The program of being carried out at step S24 is corresponding to a device that is used for hunting time lap t.Comprise that in the performed program of step S24 one seeks the performed program of device of actual pumping duration.
According to second embodiment of the invention,, can seek the second basic fuel and spray duration Tqb, so that can carry out control accurately to fuel injection amount for different time-interleaving parts.(the 3rd embodiment)
Fig. 8～12 have shown third embodiment of the invention, and wherein Fig. 8 shows the flow chart of the method for utilizing the injection of Fuelinjection nozzle control fuel.On the other hand, Fig. 9 has shown the flow chart of the method for a hunting time lap.Predetermined instant after the program of the flow chart representative shown in Fig. 8 and 9 is being opened ignition switch is carried out repeatedly.
Flow chart shown in Figure 8 begins in step S31, at this step input engine parameter.Described engine parameter comprises engine speed NE and quickens to open ACCP.At step S32, open ACCP then, determine target fuel injection amount Q according to engine speed NE and acceleration.At step S33, open ACCP subsequently, determine target fuel injection timing T according to engine speed NE and acceleration.At step S34, import common rail fuel pressure P c then.
At step S35, convert target fuel injection timing T to basic fuel injection timing TBASE subsequently.According to basic fuel injection timing TBASE and common rail fuel pressure P c, determine that basic fuel sprays duration TqBASE then.At step S36, basic fuel injection timing TBASE and basic fuel injection duration TqBASE are proofreaied and correct subsequently.Basic fuel injection timing TBASE after the correction and basic fuel spray duration TqBASE and are known as Tcom and Tqcom respectively.
Then at next step S37, hunting time lap t.By using reaction time lap t, common rail fuel pressure P c shown in Figure 12 and proofreading and correct the characteristic pattern that concerns between the quantity Δ Tq, seek correction quantity Δ Tq.Flow chart shown in Figure 9 has at length shown the process of hunting time lap t and common rail fuel pressure P c.Subsequently,, spray duration Tqcom correction down quantity Δ Tq, obtain final fuel and spray duration TqFINAL with proofreading and correct the basic fuel in back at next step S38.
At step S39, proofread and correct the basic fuel injection timing Tcom in back and be converted into final basic fuel injection timing TFINAL then.Final then basic fuel injection timing TFINAL and final fuel spray duration TqFINAL and are converted into the fuel injection amount command value, just opening of valves command value and valve out code value.Set the fuel injection amount command value at output stage then.At step S40, represent the Fuelinjection nozzle fuel jeting instruction pulse of fuel injection amount command value to be output to the solenoid valve of the Fuelinjection nozzle 5 of k cylinder, thereby drive the Fuelinjection nozzle 5 of k cylinder subsequently.Control flow returns caller then.
Flow process shown in Figure 9 starts from step S41, and in this step, the drive signal that is used for the SCV4 of fuel injection pump 3 is transfused to.At next step S42, utilize characteristic pattern shown in Figure 10 then, seek pump discharge amount QP.This characteristic pattern is represented the relation between engine speed NE, SCV drive signal and the pump discharge amount Qp, obtains this characteristic pattern by experimentizing in advance.In other words, obtain pump discharge amount Qp according to engine speed NE and SCV drive signal.
Subsequently, at next step S43,, seek pumping duration Pd according to pump discharge amount Qp and crank angle degree.As shown in figure 11, pumping duration Pd and pump discharge amount Qp have fixed relationship.Then, at next step S44, import basic fuel and spray duration Tcom, basic fuel injection timing TQcom, fuel injection initial delay time TDM and fuel injection end TDEM retard time.Comprise that in the performed operation of step S44 utilizing fuel injection initial delay time computing device and fuel to spray finishes the performed operation of computing device retard time.
Should be noted that as shown in figure 11, it is a kind of like this time lag that fuel sprays initial delay time TDM, promptly arrives after the fuel injection timing, the operation elapsed time that promotes nozzle needle till the fuel actual ejection during this period of time.Fuelinjection nozzle 5 has such structure, according to common rail fuel pressure P c, and by the lifting nozzle needle, thus opens solenoid valve.Therefore, according to common rail fuel pressure P c, fuel sprays initial delay time TDM to be changed.Reason advises finding that by prior experiment fuel sprays initial delay time TDM and concerns between the rail fuel pressure Pc together for this reason, produces a characteristic pattern.
On the other hand, it is a kind of like this time remaining phase that fuel spray to finish retard time TDEM, and promptly as shown in figure 10, current practice to the fuel that flows to the solenoid valve of Fuelinjection nozzle 5 from cut-out sprays till the physical end during this period of time.In the case, preferably find that by prior experiment fuel sprays end TDEM retard time and concerns between the rail fuel pressure Pc together, produce a characteristic pattern.
At step S45, based on fuel sprays initial delay time TDM and basic fuel sprays duration Tcom subsequently, and the fuel that fuel injection zero-time computing device is sought Fuelinjection nozzle 5 sprays initial timing T1.Then, based on fuel sprays end TDEM retard time, basic fuel injection duration Tcom and basic fuel injection timing Tqcom, and the fuel that fuel sprays end-time calculating means searching Fuelinjection nozzle 5 sprays end timing T2.Based on fuel sprays initial timing T1 and fuel injection end timing T2 subsequently, and natural fuel sprays the duration computing device and seeks natural fuel injection duration ATq.
At next step S46, time-interleaving part computing device is sought the time-interleaving part t of pumping duration Pd and natural fuel injection duration ATq then.Subsequently, at next step S47, utilize the characteristic pattern that produces according to experimental result in advance, fuel sprays duration correcting device searching and proofreaies and correct quantity Δ Tq.As shown in figure 12, characteristic pattern is represented the relation between common rail fuel pressure P c, time-interleaving part t and the correction quantity Δ Tq.
Spraying pumping operation once or twice such as a pumping operation and spraying in twice the situation of synchronous injection, very within the bounds of possibility clear, according to pumping duration end phase place, adopt a kind of random fashion, fuel injection duration and pumping duration are overlapping or not overlapping.On the other hand, spraying twice such as a pumping operation or four pumping operations and spraying in six times the situation of synchronous injection, when some cylinders were confirmed as overlapping cylinder, other cylinders were confirmed as non-overlapped cylinder.
According to the 3rd embodiment, can contain a cylinder under the overlapping situation of the pumping duration of injection duration of Fuelinjection nozzle and fuel injection pump and same cylinder in the difference between the fuel injection amount under the not overlapping situation of pumping duration of injection duration of Fuelinjection nozzle and fuel injection pump.Therefore can contain that certain cylinder is in the difference between the fuel injection amount under the overlapping and not overlapping situation in the motor 1, this moment, the pumping duration of fuel injection pump 3 was different with the operation duration of cylinder in this motor.In addition, the difference that can contain the fuel injection amount between overlapping cylinder and the not overlapping cylinder.(the 4th embodiment)
In the 4th embodiment, except the performed program of second embodiment, ECU10 carries out a program, in order to detect pumping duration zero-time PSTART and pumping duration concluding time PEND.
ECU10 comprises a low-pass filter 10a and a high-pass filter 10b, and these wave filter are used for the signal that receives from common rail fuel detecting sensor 35 is carried out filtering.Low-pass filter 10a detects the variation at a slow speed of common rail fuel pressure P c.The output value of low-pass filter 10a is represented the mean value of common rail fuel pressure P c.Low-pass filter 10a output one is used to control the stable signal of SVC4.The output value of low-pass filter 10a be the pumping stroke of fuel injection pump 3 finish and spray next time between a period of time in the mean value of common rail fuel pressure P c.On the other hand, high-pass filter 10b detects the quick variation of common rail fuel pressure P c.The output value of high-pass filter 10b is represented the momentary value of common rail fuel pressure P c.High-pass filter 1b output one is used to detect the signal of pumping duration zero-time PSTART and pumping duration concluding time PEND.According to the variation of the common rail fuel pressure P c with big relatively inclination, detect pumping duration zero-time PSTART and pumping duration concluding time PEND.Low-pass filter 10a and high-pass filter 10b have reduced the burden of the performed software program of ECU10, have therefore increased processing rate.
Figure 13 has shown that performed being used to of expression the 4th embodiment detects the flow chart of the program of pumping duration zero-time PSTART and pumping duration concluding time PEND.In the 4th embodiment, carry out the performed program of second embodiment according to detected pumping duration zero-time PSTART in the represented program of flow chart shown in Figure 13 and pumping duration concluding time PEND.
After opening ignition switch, the program of flow process representative shown in Figure 13 was performed in the predetermined moment, for example at 0.5msec within the 1.0msec scope or 6 moment of writing music Shaft angle CA.
Flow chart shown in Figure 13 starts from step S131, and in this step, the output of high-pass filter 106 is transfused to as current common rail fuel pressure P ci.In storage, read next-door neighbour's common rail fuel pressure P cil formerly then, scheduled period before the current time formerly constantly or with current crank angle one formerly during crank angle of one predetermined crank angle difference arranged, formerly Jin Lin common rail fuel pressure P cil is stored in the storage.Subsequently, flow process enters step S132, in order to seek present common rail fuel pressure P ci and formerly to be close to difference DELTA Pc between the common rail fuel pressure P ci1.Then, flow process enters step S133, determines whether described Δ Pc is equal to or greater than the first predetermined value PR1.If judged result is for being, flow process enters step S134, current location is used as pumping duration start-phase PSTART and is stored in the storage in this step.Then current common rail fuel pressure P ci is stored in the storage as formerly being close to rail fuel pressure Pcil altogether.
On the other hand, if the judged result that step S133 obtained is that flow process does not enter step S135, determine whether described Δ Pc is equal to or greater than the second predetermined value PR2 and still is equal to or less than the 3rd predetermined value PR3.It should be noted that the first predetermined value PR1, the second predetermined value PR2 and the 3rd predetermined value PR3 should satisfy following relation, i.e. PR1＞PR2＞PR3.If judged result is stored in current common rail fuel pressure P ci in the storage as formerly being close to common rail fuel pressure P cil for not.It is pointed out that the second predetermined value PR2 is one and is used for and will be sprayed the value that caused voltage descends and difference DELTA Pc distinguishes by fuel.On the other hand, the 3rd predetermined value PR3 is one and is used for a value distinguishing with difference DELTA Pc being descended by the caused voltage of the static leakage of Fuelinjection nozzle 5.
On the other hand, if the judged result of step S135 is for being, flow process enters step S136, in this step, current phase place is finished phase place PEND as the pumping duration store.Common rail fuel pressure P ci is stored in the storage as formerly being close to common rail fuel pressure P cil at present then.
In order to obtain the judged result of "Yes" at step S135, can add a condition, promptly outside existence conditions, the pumping duration, zero-time PSTART was detected.In addition, in order to obtain the judged result of "Yes" at step S135, can add a condition, promptly outside existence conditions, common rail fuel pressure P c is increased.
According to the 4th embodiment,, can seek the pumping duration by software operation.For the variable pumping duration, can the hunting time lap.Therefore can highi degree of accuracy adjust fuel injection amount.
The method of the searching lap that the present invention second and the 4th embodiment are adopted is also applicable to fuel injection pump like the syncsort.The time-interleaving part t that for example utilizes the 4th embodiment's method to seek can be used to seek the described correction quantity of the 3rd embodiment Δ Tq.In addition, can eliminate under cylinder sprays duration and fuel injection pump at the fuel of Fuelinjection nozzle the overlapping situation of pumping duration and the difference between the fuel injection amount under the not overlapping situation of pumping duration of the fuel injection duration of same cylinder fuel injection valve and fuel injection pump.(the 5th embodiment)
Figure 14～20 have shown fifth embodiment of the invention.After opening ignition switch, the program of flow chart representative shown in Figure 14 predetermined instant is more repeatedly carried out.
Flow process starts from step S141, at this step input common rail fuel pressure P c.Then,, call the represented program of flow chart shown in Figure 13, be used to detect pumping duration start-phase PSTART and pumping duration end phase place PEND, and they are stored in the storage at next step S142.Subsequently, at next step S143, the pumping duration start-phase PSTART of based on fuel supply pump 3, pumping duration finish phase PEND position, cam profile (or plunger position) and crank angle, seek the 360 pump output Qp that write music the Shaft angle CA duration.As shown in figure 15, can determine pump output Qp according to the geometric profile of cam, described cam profile is similar to a sinusoidal curve.
Then at next step S144, by using equation or according to characteristic pattern that prior experimental result obtained, seek the static leakage quantity QSLBASE of basic Fuelinjection nozzle, as shown in figure 16, described characteristic pattern is represented the relation between the static leakage quantity QSLBASE of common rail fuel pressure P c, engine speed NE and basic Fuelinjection nozzle.Subsequently as shown in figure 17, by using formula or according to the characteristic pattern that prior experimental result obtained, seeking fuel temperature correction factor f ι, as shown in figure 17, described characteristic pattern is represented the relation between fuel temperature THF and the fuel temperature correction factor f ι.The static leakage quantity QSLBASE and the fuel temperature correction factor f ι of last basic Fuelinjection nozzle multiply each other, and produce static leakage amount QSL.
Subsequently, at next step S145, by using formula or according to characteristic pattern that prior experimental result obtained, seek the dynamic leakage amount QDL of Fuelinjection nozzle, as shown in figure 18, described characteristic pattern represents that target fuel sprays the relation between the dynamic leakage amount QDL of duration Tq, common rail fuel pressure P c and Fuelinjection nozzle.Then, at next step S146, target fuel injection amount Q is converted into fuel injection amount QINJ, and it is stored in the storage.
Subsequently, at next step S147, seek the shown in Figure 19 360 variation delta P that write music the common rail fuel pressure P c that occurs in duration of Shaft angle CA.More particularly, monitor common rail fuel pressure P c, so that seek variation delta P.For example common rail fuel pressure P c is stored on duration property ground.Subtract previous common rail fuel pressure P cn360 with present common rail fuel pressure P c then, obtain variation delta P.
Then, at next step S148, by using following formula or according to the characteristic pattern that prior experimental result obtained, calculate the value added Δ V of fuel quantity of the high-pressure section of fuel injection system, the value added Δ V of described fuel quantity is exactly the value added that increases the required fuel quantity of fuel pressure Δ P.
ΔV＝(V/E)×ΔP
Here symbol E represents bulk modulus.
Subsequently, at next step S149, distribute by using equation given below or fuel consumption shown in Figure 20, the fuel leak device for calculating calculates the 360 fuel leakage rates in the Shaft angle CA duration of writing music.
QLEAK＝Qp-(QSL×4)-(QDL×2)-(QINJ×2)-ΔV
Above-mentioned equation is applicable to that a pumping operation sprays the Shaft angle CA that writes music for twice and per 360 and sprays twice four cylinder engine.
Then, flow process enters step S150, determines whether that fuel leak amount QLEAK is bigger than predetermined value QL1.If judged result is for denying the flow process end.On the other hand, if the judged result that is obtained at step S150 is for being to confirm to exist in high-pressure fuel line fuel leak.In the case, flow process enters step S151, carries out different types of processing.For this processing, wish to carry out fuel injection control or pump control, to keep minimum operational condition or shutting engine down.
As mentioned above, can obtain PSTART and PEND, obtain fuel leak amount QLEAK accurately according to carrying out the represented processing operation of flow chart shown in Figure 13.Open undesired or during failure at fuel injection pump 3, open when undesired, during undesired or failure, can carry out the control of fuel injection control or pump, to keep minimum operational condition or shutting engine down at fuel dispensing system at Fuelinjection nozzle 5.(the 6th embodiment)
Figure 21 is a Block Diagram, has shown employed control unit of engine 10 among the 6th embodiment.ECU10 has the detection device 61 that is used to detect actual pumping duration end phase place PEND.By carrying out the operation of flow chart representative shown in Figure 13, detection device 61 finishes phase place PEND by the processing of carrying out flow chart representative shown in Figure 13 to detect the actual pumping duration.ECU10 also has the basic pumping duration end phase place storage device 62 that is used to store basic pumping end phase place.The basic pumping duration finishes phase place storage device 62 normally EEPROM or RAM.According to ideal fit state contemplated when the designed engines system, determine that basic pumping finishes phase place.Also can utilize the fuel injection pump 3 that is adjusted under the ideal condition and the assembling condition of motor 1, rule of thumb seek basic pumping and finish phase place.For example, the variation of common rail fuel pressure P c under perfect condition is shown in the waveform Pc0 of Figure 22.Figure 22 has shown waveform Pc0 basic value PRR.In addition, ECU10 also has phase difference calculating device 63.Phase difference calculating device 63 is sought the difference CC between actual pumping duration end phase place PEND and the basic value PRR.This difference CC is offered the engine controlling unit 64 that is used for according to difference CC control motor.For example, according to this difference CC, fuel injection amount control or pump control are proofreaied and correct.Difference CC represents the assembly error of fuel injection pump 3 and motor 1.When the phase place of the camshaft of fuel injection pump 3 just occurs deviation with respect to the phase place of bent axle 15 pivotal positions with normal phase place, when for example having increased difference CC, when having this error, common rail fuel pressure P c changes shown in waveform Pc1 among Figure 22 or Pc2 like that.In the case, phase difference calculating device 63 produces phase difference C1 or C2 respectively.
As mentioned above, under situation shown in the 6th embodiment, the assembly error of fuel injection pump 3 can be corrected.In addition, can control motor according to this assembly error.(but improved mode)
For substituting of structural element in the foregoing description, can use following structural element.As substituting of common rail fuel pressure P c, for example, can use the pressure of 3 discharge fuel of fuel injection pump.Use is installed in the pressure that the fuel pressure sensor on the fuel conduit between fuel injection pump 3 and the Fuelinjection nozzle 5 can detect 3 discharge fuel of above-mentioned fuel injection pump.
In addition, the signal that is used for the solenoid valve of driving fuel injection valve 5 can be adjusted in the multistage.For example, ECU10 can set a control mode, wherein during first duration that originates in the opens solenoid valve operation, first electric current is directed to Fuelinjection nozzle 5, during end to close second duration of solenoid operated, second electric current is directed to Fuelinjection nozzle 5.In the case, the correction of being carried out according to time-interleaving part t went for for first or second duration, or was applicable to this two durations.When the time, lap t was very long, for example, first or second duration was shortened.
Replacing method as the computational methods that are suitable in the above-described embodiments, a kind of implementation can be provided, wherein adjust the unlatching of valve 4 or flow to electric current (or so-called SVC conduction current) and the common rail fuel pressure P c that valve 4 is adjusted in this air inlet, can seek pump output Qp according to engine speed NE, air inlet.Also a kind of implementation can be provided,, fuel leak amount QL can be sought wherein according to engine speed NE, target fuel injection amount Q, common rail fuel pressure P c and fuel temperature THF.Also can provide a kind of implementation in addition,, seek fuel leak amount QL wherein according to pump output Qp, target fuel injection amount Q and fuel leak amount QL.
In addition, for the replacement scheme of performed program in the foregoing description, can carry out following program.Cam profile (cam phase or plunger position), pumping duration zero-time PSTART and pumping duration concluding time PEND that can based on fuel supply pump 3 carry out the program of calculating pump output Qp for how much.In addition, can carry out how much and calculate the program of actual pumping duration according to the cam profile of pump output Qp and fuel injection pump 3.Spray duration Tq, target injection timing T, fuel injection initial delay time and fuel injection according to target fuel in addition and finish retard time, carry out the program of how much calculating natural fuel injection timings.Can spray the duration according to actual pumping duration and natural fuel in addition, carry out calculating for how much the program of real time lap.In addition, for pumping duration end phase place, the information of the geometric position in the engine assembly of relevant fuel injection pump 3 can be stored in the storage, can obtain again when needing later on.
Although in the above-described embodiments, described time-interleaving part is represented that by a time period this time-interleaving part also can be represented by crank angle or camshaft degree.

Claims (29)

1. employed pressure-accumulating jet system in internal-combustion engine, described pressure-accumulating jet system comprises:
Accumulator is used for fuel is pressurizeed and stores fuel under high pressure being used to spray under the pressure of described fuel;
By described oil-engine driven fuel injection pump, be used to exert pressure so that absorb fuel and the fuel-pumping that is absorbed is arrived described accumulator;
Be the Fuelinjection nozzle that each cylinder of described internal-combustion engine is equipped with, by described fuel under high pressure being sprayed in the into described cylinder, the high-pressure fuel supply after will pressurizeing in accumulator is in described cylinder;
Fuel pressure detection device is used to detect the pressure of described fuel injection pump institute discharge fuel;
First fuel sprays the duration and determines device, be used for according to the target fuel injection amount that conforms to described operation of internal combustion engine condition and the detected fuel pressure of described fuel pressure detection device that set, the fuel of determining the cylinder of described internal-combustion engine sprays the duration, for above-mentioned cylinder, it is not overlapping that the pumping duration of described fuel injection pump and the fuel of described Fuelinjection nozzle spray the duration;
Second fuel sprays the duration and determines device, time-interleaving part according to target fuel injection amount, detected fuel pressure and described pumping duration and described fuel injection duration, the fuel of determining the cylinder of described internal-combustion engine sprays the duration, for above-mentioned cylinder, it is overlapping that the pumping duration of described fuel injection pump and the fuel of described Fuelinjection nozzle spray the duration.
2. one kind according to the described pressure-accumulating jet system of claim 1, it is characterized in that:
By using by described target fuel injection amount and determined first foundation drawing of detected fuel pressure, described first fuel sprays the duration and determines that device determines that described fuel sprays the duration;
By using by described target fuel injection amount and determined second foundation drawing different with first foundation drawing of detected fuel pressure, described second fuel sprays the duration and determines that device determines the described fuel injection duration.
3. one kind according to the described pressure-accumulating jet system of claim 1, it is characterized in that:
By using by described target fuel injection amount and the determined foundation drawing of detected fuel pressure, described first fuel sprays the duration and determines that device finds that first fuel sprays the duration;
According to described time-interleaving part, spray the duration and proofread and correct by described first fuel being sprayed described first fuel that the duration determines that device is found, described second fuel sprays the duration and determines that device finds that second fuel sprays the duration.
4. one kind at employed pressure-accumulating jet system in internal-combustion engine, and described pressure-accumulating jet system comprises:
Accumulator is used for fuel is pressurizeed and stores fuel under high pressure being used to spray under the pressure of described fuel;
By described oil-engine driven fuel injection pump, be used for to the fuel that is absorbed exert pressure and with the fuel-pumping that absorbed to described accumulator;
Be the Fuelinjection nozzle that each cylinder of described internal-combustion engine is equipped with, by described fuel under high pressure being sprayed in the into described cylinder, with the high-pressure fuel supply after the pressurization in the accumulator in described cylinder;
Fuel pressure detection device is used to detect the pressure of described fuel injection pump institute discharge fuel;
Fuel sprays the duration and determines device, is used for determining the detected fuel pressure of device according to the target fuel injection amount that conforms to described operation of internal combustion engine condition and the described fuel pressure that set, determines that fuel sprays the duration;
Time-interleaving part computing device is used for lap computing time, and during this period, it is overlapping that the pumping duration of described fuel injection pump and the fuel of described Fuelinjection nozzle spray the duration;
Fuel sprays the duration correcting device, is used for according to described time-interleaving part, described fuel is sprayed the duration proofread and correct.
5. one kind according to the described pressure-accumulating jet system of claim 4, it is characterized in that: described fuel sprays the duration correcting device and has a correction number device for calculating, is used for according to described time-interleaving part, and computing fuel sprays the duration and proofreaies and correct quantity; And
Spray the duration according to described fuel and proofread and correct quantity, described fuel is sprayed the duration proofread and correct.
6, a kind of according to the described pressure-accumulating jet system of claim 4, it is characterized in that:
Described time-interleaving determines that partly device comprises:
Pumping duration start-phase computing device is used for according to detected fuel pressure, finds pumping duration start-phase;
The pumping duration finishes the phase calculation device, is used for according to detected fuel pressure, finds that the pumping duration finishes phase place;
Actual pumping duration computing device is used for finishing phase place according to described pumping duration start-phase and pumping duration, finds the actual pumping duration;
Spray the duration and, find described time-interleaving part according to described actual pumping duration, described fuel according to the fuel injection timing that conforms to described operation of internal combustion engine condition that sets.
7. one kind according to the described pressure-accumulating jet system of claim 5, it is characterized in that:
Described time-interleaving part computing device comprises:
Pumping duration start-phase computing device is used for according to detected fuel pressure, finds pumping duration start-phase;
The pumping duration finishes the phase calculation device, is used for according to detected fuel pressure, finds that the pumping duration finishes phase place;
Actual pumping duration computing device is used for finishing phase place according to described pumping duration start-phase and pumping duration, finds the actual pumping duration;
Spray the duration and, find described time-interleaving part according to described actual pumping duration, described fuel according to the fuel injection timing that conforms to described operation of internal combustion engine condition that sets.
8. one kind according to the described pressure-accumulating jet system of claim 4, it is characterized in that: described time-interleaving part computing device has the pumping duration computing device that calculates the pumping duration according to the discharge capacity of described fuel injection pump;
According to described pumping duration and described fuel injection duration, described time-interleaving part computing device lap computing time.
9. one kind according to the described pressure-accumulating jet system of claim 5, it is characterized in that: described time-interleaving part computing device has the pumping duration computing device that calculates the pumping duration according to the discharge capacity of described fuel injection pump;
According to described pumping duration and described fuel injection duration, described time-interleaving part computing device lap computing time.
10. one kind according to the described pressure-accumulating jet system of claim 4, it is characterized in that:
Described time-interleaving part computing device comprises:
Fuel sprays initial timing computing device, is used for computing fuel and sprays initial timing;
Fuel sprays and finishes the timing computing device, is used for computing fuel and sprays the end timing;
Natural fuel sprays the duration computing device, is used for spraying initial timing and fuel injection end timing according to described fuel, calculates natural fuel and sprays the duration;
Be used to calculate the pumping duration computing device of pumping duration;
Spray duration and described pumping duration, described time-interleaving part computing device lap computing time according to described natural fuel.
11. one kind according to the described pressure-accumulating jet system of claim 5, it is characterized in that:
Described time-interleaving part computing device comprises:
Fuel sprays initial timing computing device, is used for computing fuel and sprays initial timing;
Fuel sprays and finishes the timing computing device, is used for computing fuel and sprays the end timing;
Natural fuel sprays the duration computing device, sprays initial timing and fuel injection end timing according to described fuel, calculates natural fuel and sprays the duration;
Be used to calculate the pumping duration computing device of pumping duration;
Spray duration and described pumping duration, described time-interleaving part computing device lap computing time according to described natural fuel.
12. one kind according to the described pressure-accumulating jet system of claim 6, it is characterized in that:
Described time-interleaving part computing device comprises:
Fuel sprays initial timing computing device, is used for computing fuel and sprays initial timing;
Fuel sprays and finishes the timing computing device, is used for computing fuel and sprays the end timing;
Natural fuel sprays the duration computing device, is used for spraying initial timing and fuel injection end timing according to described fuel, calculates natural fuel and sprays the duration;
Be used to calculate the pumping duration computing device of pumping duration;
Spray duration and described pumping duration, described time-interleaving part computing device lap computing time according to described natural fuel.
13. a described according to Claim 8 pressure-accumulating jet system is characterized in that: described time-interleaving part computing device comprises:
Fuel sprays initial timing computing device, is used for computing fuel and sprays initial timing;
Fuel sprays and finishes the timing computing device, is used for computing fuel and sprays the end timing;
Natural fuel sprays the duration computing device, is used for spraying initial timing and fuel injection end timing according to described fuel, calculates natural fuel and sprays the duration;
Be used to calculate the pumping duration computing device of pumping duration;
Spray duration and described pumping duration, described time-interleaving part computing device lap computing time according to described natural fuel.
14. one kind at employed pressure-accumulating jet system in internal-combustion engine, described pressure-accumulating jet system comprises:
Accumulator is used for fuel is pressurizeed and stores fuel under high pressure being used to spray under the pressure of described fuel;
Fuel injection pump, it has by a described oil-engine driven cam and a plunger, under the driving of described cam, described plunger slides before and after the pumping cylinder, generation will be applied in the pressure to absorption fuel, and absorb fuel and be pumped into described accumulator;
Be the Fuelinjection nozzle that each cylinder of described internal-combustion engine is equipped with, by described fuel under high pressure being sprayed in the into described cylinder, with the high-pressure fuel supply after the pressurization in the accumulator in described cylinder;
Fuel pressure detection device is used to detect the pressure of described fuel injection pump institute discharge fuel;
Pumping duration start-phase detection device, be used to detect a cam phase of described fuel injection pump, when the variation of the detected fuel pressure of described fuel pressure detection device equals or exceeds a predetermined value, with this phase place as pumping duration start-phase;
The pumping duration finishes phase detection device, be used to detect a cam phase of described fuel injection pump, after described variation surpasses predetermined value, when the variation of the detected fuel pressure of described fuel pressure detection device is equal to or less than predetermined value, this phase place is finished phase place as the pumping duration, or be used to store the pumping duration end phase place of determining for how much according to the assembly relation between described fuel injection pump and the described internal-combustion engine;
Engine controlling unit is used to control described pumping duration start-phase when the described internal-combustion engine of control and the described pumping duration finishes phase place.
15. one kind according to the described pressure-accumulating jet system of claim 14, it is characterized in that: when the difference between present fuel pressure and the previous fuel pressure is increased to one when equaling the value of first predetermined value at least, detect a cam phase, with its start-phase as the described pumping duration, described previous fuel pressure is meant described fuel pressure detection device in detected fuel pressure before one scheduled time of time at present, and described present fuel pressure is meant apart from described previous time detected fuel pressure of described fuel pressure detection device after one scheduled time.
16. one kind according to the described pressure-accumulating jet system of claim 15, it is characterized in that: when a back fuel pressure and at present the difference between the fuel pressure drop to one when being equal to or less than the value of the 3rd predetermined value, detect a cam phase, with its end phase place as the described pumping duration, described present fuel pressure is meant described fuel pressure detection device in the detected fuel pressure of present time apart from back one scheduled time of time, and a described back fuel pressure is meant in the detected fuel pressure of described back described fuel pressure detection device of one time after described present one scheduled time of time.
17. one kind according to the described pressure-accumulating jet system of claim 14, it is characterized in that: described engine controlling unit comprises:
Fuel injection amount and fuel injection timing are determined device, are used to find the command fuel emitted dose and the command fuel injection timing that conform to described internal combustion engine operation state;
Fuel sprays the duration and determines device, is used for the fuel injection amount according to described fuel pressure and described instruction, determines the command fuel injection duration;
Time-interleaving part computing device, be used for finishing phase place, described command fuel injection duration and described command fuel injection timing according to described pumping duration start-phase, described pumping duration, computing time lap, during this period, it is overlapping that the fuel of the pumping duration of described fuel injection pump and described supply of fuel valve sprays the duration.
18. one kind according to the described pressure-accumulating jet system of claim 15, it is characterized in that: described engine controlling unit comprises:
Fuel injection amount and fuel injection timing are determined device, are used to find the command fuel emitted dose and the command fuel injection timing that conform to described internal combustion engine operation state;
Fuel sprays the duration and determines device, is used for according to described fuel pressure and described command fuel emitted dose, determines the command fuel injection duration;
Time-interleaving part computing device, be used for finishing the fuel injection duration of phase place, described instruction and the fuel injection timing of described instruction according to described pumping duration start-phase, described pumping duration, computing time lap, during this period, it is overlapping that the fuel of the pumping duration of described fuel injection pump and described supply of fuel valve sprays the duration.
19. one kind according to the described pressure-accumulating jet system of claim 16, it is characterized in that: described engine controlling unit comprises:
Fuel injection amount and fuel injection timing are determined device, are used to find the command fuel emitted dose and the command fuel injection timing that conform to described internal combustion engine operation state;
Fuel sprays the duration and determines device, is used for the fuel injection amount according to described fuel pressure and described instruction, determines the command fuel injection duration;
Time-interleaving part computing device, be used for finishing the fuel injection duration of phase place, described instruction and the fuel injection timing of described instruction according to described pumping duration start-phase, described pumping duration, computing time lap, during this period, it is overlapping that the fuel of the pumping duration of described fuel injection pump and described supply of fuel valve sprays the duration.
20. one kind according to the described pressure-accumulating jet system of claim 17, it is characterized in that:
Described engine controlling unit has fuel and sprays the duration correcting device, is used for according to described time-interleaving part, proofreaies and correct described command fuel and sprays the duration;
Described fuel sprays the duration correcting device and has the correction number device for calculating, is used for according to described fuel pressure and described time-interleaving part, and computing fuel sprays the duration and proofreaies and correct quantity;
Spray duration and described fuel injection duration correction quantity according to described command fuel, the fuel after finding to proofread and correct sprays the duration.
21. one kind according to the described pressure-accumulating jet system of claim 14, it is characterized in that: described engine controlling unit has the pump output computing device, be used for the cam profile according to described fuel injection pump, described cam position or described plunger position, described pumping duration start-phase and described pumping duration end phase place, calculate described fuel injection pump and be pumped into the interior quantity of fuel of described accumulator.
22. one kind according to the described pressure-accumulating jet system of claim 15, it is characterized in that: described engine controlling unit has the pump output computing device, be used for the cam profile according to described fuel injection pump, described cam position or described plunger position, described pumping duration start-phase and described pumping duration end phase place, calculate described fuel injection pump and be pumped into the interior quantity of fuel of described accumulator.
23. one kind according to the described pressure-accumulating jet system of claim 16, it is characterized in that: described engine controlling unit has the pump output computing device, be used for the cam profile according to described fuel injection pump, described cam position or described plunger position, described pumping duration start-phase and described pumping duration end phase place, calculate described fuel injection pump and be pumped into the interior quantity of fuel of described accumulator.
24. one kind according to the described pressure-accumulating jet system of claim 21, it is characterized in that: described engine controlling unit comprises:
Fuel injection amount is determined device, is used for definite command fuel emitted dose that conforms to described internal combustion engine operation state;
Fuel sprays the duration and determines device, is used for the fuel injection amount according to described fuel pressure and described instruction, determines the command fuel injection duration;
Be used to detect the fuel temperature detection device of fuel temperature;
The static leakage device for calculating is used for according to described fuel temperature and fuel pressure, the static leakage amount of computing fuel injection valve;
The dynamic leakage device for calculating is used for spraying duration, the dynamic leakage amount of computing fuel injection valve according to described fuel pressure and described command fuel;
The fuel leak device for calculating is used for according to the dynamic leakage amount of described Fuelinjection nozzle and the static leakage amount of described Fuelinjection nozzle, calculates the quantity of fuel of leaking from pressure duct.
25. one kind according to the described pressure-accumulating jet system of claim 24, it is characterized in that: when the quantity of fuel of leaking from pressure duct is increased to or surpasses a predetermined value, described engine controlling unit carries out pump control or fuel injection amount control, to improve Security.
26. one kind according to the described pressure-accumulating jet system of claim 14, it is characterized in that: described fuel pressure detection device is a kind of fuel pressure sensor, is used to produce the electrical signal of the detected fuel pressure of representative;
One electric control unit is set, and this control unit comprises embeddeding computer, and this computer comprises that described pumping duration start-phase detection device, described pumping duration finish the function of phase detection device and described engine controlling unit;
Described electric control unit comprises low-pass filter and high-pass filter, described low-pass filter only can be by having very little variable quantity the electrical signal of described fuel pressure sensor, this signal is transferred to described computer, described high-pass filter only can be by having the great changes amount the electrical signal of described fuel pressure sensor, this signal is transferred to described computer.
27. one kind at employed pressure-accumulating jet system in internal-combustion engine, described pressure-accumulating jet system comprises:
Accumulator is used for fuel is pressurizeed and stores fuel under high pressure being used to spray under the pressure of described fuel;
Fuel injection pump, it has by a described oil-engine driven cam and a plunger, under the driving of described cam, described plunger slides before and after back and forth in pumping cylinder, generation will be applied in the pressure to absorption fuel, absorb fuel and be pumped into described accumulator;
Be the Fuelinjection nozzle that each cylinder of described internal-combustion engine is equipped with, by described fuel under high pressure being sprayed in the into described cylinder, with the high-pressure fuel supply after the pressurization in the accumulator in described cylinder;
Fuel pressure detection device is used to detect the pressure of described fuel injection pump institute discharge fuel;
The pumping duration finishes phase detection device, be used to detect a cam phase of described fuel injection pump, after described variation surpasses a described predetermined value, when the variation of the detected fuel pressure of described fuel pressure detection device is equal to or less than a predetermined value, this phase place is finished phase place as the pumping duration;
The pumping duration finishes the phase place storage device, is used to store the base value that the described pumping duration finishes phase place, according to the relation between the cam phase of the corner of described internal combustion engine output shaft and described fuel injection pump, finds described base value in advance;
The phase difference calculating device is used to calculate the detected camshaft of pumping duration end phase place and the phase difference between the described described base value be used as, and this base value finishes phase place corresponding to the described pumping duration.
28. one kind according to the described pressure-accumulating jet system of claim 1, it is characterized in that: described time-interleaving part is represented by a time period, crank angle or camshaft degree.
29. one kind according to the described pressure-accumulating jet system of claim 4, it is characterized in that: described time-interleaving part is represented by a time period, crank angle or camshaft degree.
CNB031021883A 2002-01-31 2003-01-30 Pressure-accumulating jet system Expired - Fee Related CN100497917C (en)

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JP2002023828A JP4026368B2 (en) 2002-01-31 2002-01-31 Accumulated fuel injection system
JP023607/2002 2002-01-31
JP2002023607A JP3969104B2 (en) 2002-01-31 2002-01-31 Accumulated fuel injection system
JP023828/2002 2002-01-31

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DE10303765A1 (en) 2003-09-04

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