CN103244296B - For the fuel pressure waveform acquisition device of fuel injection system - Google Patents
For the fuel pressure waveform acquisition device of fuel injection system Download PDFInfo
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- CN103244296B CN103244296B CN201310028338.3A CN201310028338A CN103244296B CN 103244296 B CN103244296 B CN 103244296B CN 201310028338 A CN201310028338 A CN 201310028338A CN 103244296 B CN103244296 B CN 103244296B
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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
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
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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
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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
- 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
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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
- 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
- F02D2200/0614—Actual fuel mass or fuel injection amount
- F02D2200/0616—Actual fuel mass or fuel injection amount determined by estimation
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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
- 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
- F02D2200/0618—Actual fuel injection timing or delay, e.g. determined from fuel pressure drop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/04—Fuel pressure pulsation in common rails
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—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
Fuel pressure waveform acquisition device comprises: pressure waveform acquisition device, and it is for obtaining the first pressure waveform using fuel pressure sensor to detect, as the multistage jet pressure waveform occurred when performing multistage fuel and spraying; Model Waveform storage device, it is for being stored as the model waveform of the specification of the second pressure waveform, and this second pressure waveform is assumed in perform the target of spraying than the second stage in spraying as the multistage or more late stage and spray appearance when the more early-injection in more Zao stage and non-performance objective spray; Waveform extracting device, it extracts for deducting model waveform from multistage jet pressure waveform and sprays by target the 3rd pressure waveform caused; And compensation device, it is for by carrying out compensation model waveform by model waveform attenuating one dough softening, this dough softening depend on from more early be ejected into the injection interval that target sprays.
Description
Technical field
The present invention relates to a kind of equipment being used as pressure waveform for obtaining the fuel pressure time variations caused by the injects fuel from internal-combustion engine.
Background technique
In order to Driving Torque and the emissions status of accurately controlling combustion engine, must control spray regime, this spray regime comprises emitted dose and the time for spraying of the fuel ejected from the spray-hole of Fuelinjection nozzle.Publication number is that the Japanese patent application of 2010-3004 (patent documentation 1) and 2009-57924 (patent documentation 2) describes, and uses fuel pressure sensor to detect the time variations leading to fuel pressure in the fuel feed passage of fuel orifice that caused by the injection of fuel to detect the technology of actual fuel-injection condition thus.
Such as, the moment starting to decline by detecting fuel pressure can detect the actual fuel injection beginning moment, and the decrease of the fuel pressure of being sprayed by fuel by detection and causing can detect actual fuel injection amount.Detect actual fuel-injection condition to make it possible to accurately control fuel-injection condition.
By way of parenthesis, when performing multistage fuel and spraying, must consider ensuing problem, in this multistage fuel sprays, in a burning cycle, multiple exercise fuel sprays.(b) in Fig. 5 partially illustrates two pressure waveforms detected by fuel pressure sensor when performing multistage fuel and spraying.In these pressure waveforms, the pressure waveform W surrounded by dot and dash line corresponds to the injection in the n-th stage.This pressure waveform W and the injection corresponded to before, namely the repercussions (ripple components) of other pressure waveforms of the injection in m (=n-1) stage overlap, and these repercussions are the parts of being surrounded by the dot and dash line in the part (d) of Fig. 5.
In the technology that patent documentation 1 describes, the model waveform CALn-1 (it is shown in the part (d) of Fig. 5) occurred when the execution m stage sprays separately (waveform namely when the n-th stage of not applying sprays only caused by the m stage sprays) is stored in mathematical formulae, pressure waveform W is deducted model waveform CALn-1 only to spray by the n-th stage the pressure waveform Wn caused shown in the part (f) being extracted in Fig. 5, and determine actual spray regime based on extracted pressure waveform Wn.
But present inventor having been found that through various test: by deducting model waveform CALn-1 from detecting the pressure waveform W that obtains simply, accurately can not obtain and only spraying by the n-th stage the pressure waveform Wn that (target injection) cause.
Summary of the invention
According to an aspect of the present invention, provide a kind of fuel pressure waveform acquisition device for fuel injection system, described fuel injection system comprises injection valve and fuel pressure sensor, described injection valve is used for fuel to be ejected into internal-combustion engine from the spray-hole of described injection valve, described fuel pressure sensor is used as pressure waveform for the time variations detecting the fuel pressure in the fuel feed passage of leading to described spray-hole, the time variations of described fuel pressure causes due to the injection of described fuel from described spray-hole, described fuel pressure waveform acquisition device comprises: pressure waveform acquisition device, it is for obtaining the first pressure waveform detected by described fuel pressure sensor, as the multistage jet pressure waveform occurred when performing multistage fuel and spraying, in described multistage fuel sprays, fuel described in multi-injection during each burning cycle of described internal-combustion engine, model Waveform storage device, it is for memory model waveform, described model waveform is the specification of the second pressure waveform, described second pressure waveform is assumed to be at execution and is in the comparatively early-injection in comparatively early stage compared with target injection and does not perform appearance when described target is sprayed, and described target injection is that the second stage in the injection of described multistage is sprayed or late phase is sprayed, waveform extracting device, it sprays by described target the 3rd pressure waveform caused to extract for deducting described model waveform from described multistage jet pressure waveform, and compensation device, it is for the described model waveform by described model waveform attenuating one dough softening being compensated for deducting described in execution, the described dough softening depends on from the described injection interval sprayed to described target compared with early-injection, wherein, described compensation device is configured to decay to the specific part of described model waveform, and described specific part corresponds to and is opened to perform the pressure occurred at described spray-hole place when described target is sprayed at described spray-hole.
Present inventor has carried out testing 1 and test 2, deducts model waveform CALn-1 and the accuracy of pressure waveform Wn extracted the waveform W of detection when spraying from the multistage in order to be verified.
In test 1, detect the waveform occurred when performing multistage injection and be used as waveform W (part (b) see Figure 11).Next, only perform the multistage spray in the n-th stage spray, and obtain and now detect the waveform obtained and be used as waveform W0n (part (c) see Figure 11).Next, from waveform W, deduct waveform W0n, with the waveform W0n-1 shown in the part (d) obtaining Figure 11.
At first, inventor thinks that the waveform W0n-1 obtained thus represents that being assumed to be at (n-1) stage only performed in multistage injection sprays the waveform occurred when spraying as single phase.But, find subsequently waveform W0n-1 in the following areas with represent be assumed in only perform the multistage spray in (n-1) stage spray time the model waveform CALn-1 of waveform that occurs not identical: the pulse amplitude A1 of the part waveform W0n-1 occurred after the n-th stage injection beginning is less than the pulse amplitude A2 of model waveform CALn-1.
Inventor infers that the reason of the phenomenon that appearance is such is as follows.Fuel pressure pulsation (pressure wave) is propagated towards spray-hole, and then, the injected bore portion reflection of a part of fuel pressure pulsation is also propagated towards fuel pressure sensor.Correspondingly, due to the impact of fuel pressure pulsation of reflecting from spray-hole part, detect at fuel pressure sensor place in the fuel pressure waveform obtained and occurred perturbation waveform (waveform of asymptote k1 or k2 in the part (c) or (d) of Fig. 6).Although close spray-hole to spray to prevent fuel, this part of fuel pressure pulsation of reflecting due to injected bore portion is comparatively large, so pulse amplitude just becomes large.
On the other hand, opening spray-hole with when performing fuel and spray, because fuel pressure pulsation can get at outside spray-hole, so the part of injected bore portion reflection is just very little.Correspondingly, when execution fuel sprays, the pulsation (perturbation waveform) comprised in fuel pressure waveform is little compared to not performing when fuel sprays.The amount of that part in fuel pressure waveform outside spray-hole changes according to the injection interval being ejected into the injection of the n-th stage from (n-1) stage, correspondingly, the reduction degree (dough softening) of pulse amplitude is subject to the impact of the amount of this part.
According to the invention described in the claim 1 made based on the result of test 1 and the deduction of inventor, in the example as shown in fig. 5, pressure waveform Wn is extracted in order to deduct in the waveform W that detection when spraying from the multistage obtains corresponding to the model waveform CALn-1 of (n-1) stage injection, by decaying, a dough softening compensates model waveform CALn-1, this dough softening depend on from (n-1) stage be ejected into n-th the stage spray injection interval.
This can make model waveform CALn-1 closer to detect during by spraying from the multistage the waveform W that obtains n-th stage that deducted single spray time the waveform W0n that obtains of detection and the actual waveform W0n-1 that obtains, correspondingly, the pressure waveform Wn accurately extracting and caused by the n-th stage injection (target injection) is detected the waveform W obtained when can spray from the multistage.
More accurately, the reduction degree of pulse amplitude changes according to the pressure size of the fuel pressure pulsation outside spray-hole.That is, the intermediate value that the pressure along with the fuel pressure pulsation launched from spray-hole departs from change pressure is more, and the reduction degree of pulse amplitude just becomes larger.
In one embodiment, compensation device changes the dough softening according to the pressure size of the model waveform opened at spray-hole place when spray-hole sprays with performance objective.
This makes it possible to the dough softening suitably changing model waveform according to the pressure size of the fuel pressure pulsation outside spray-hole.
In one embodiment, compensation device changes the dough softening according to the pressure transformation period section of the model waveform depending on injection interval.
Pressure wave in fuel feed passage narrowed in passage or the part closed reflect, and as a result, fuel pressure waveform becomes the waveform periodically repeatedly increasing and reduce, and that is, becomes perturbation waveform.Correspondingly, the pressure size propagating into the fuel pressure pulsation of spray-hole when spray-hole is opened just depends on and is ejected into from earlier stage the injection interval and cyclically-varying that target sprays.
Structure having thus described the invention, can depend on that the model waveform pressure transformation period section according to injection interval changes the dough softening of model waveform.This pressure transformation period section propagating into the fuel pressure pulsation of spray-hole when making it possible to depend on that spray-hole is opened suitably changes the dough softening of model waveform.
In addition, found subsequently by test 2, the discharge time section Tqn sprayed along with the n-th stage becomes longer, and the pulse amplitude A1 of waveform W0n-1 just becomes less.That is, along with the valve cycle of opening becomes longer, the volume reflection of fuel pressure pulsation just becomes less, and correspondingly, pulse amplitude just becomes less.
In test 2, the change measuring the discharge time section how ratio A 1/A2 (in test 1, the pulse amplitude A1 that detects is than the ratio of pulse amplitude A2) sprays along with the n-th stage changes.Solid line in Figure 12 shows the measurement result when the fuel pressure being supplied to fuel orifice is respectively set at 200MPa, 140MPa, 80MPa and 40MPa.
Figure 12 shows, no matter the pressure of the fuel of supply, the discharge time section Tqn spraying Tqn along with the n-th stage becomes longer, and the pulse amplitude A1 of the waveform W0n-1 detected becomes less.By way of parenthesis, when n-th stage that do not perform sprays (when when ejected, section Tqn is zero), ratio A 1/A2 is 1.This means, n-th stage that performed sprays and have impact on the waveform W0n-1 detected, thus makes pulse amplitude A1 less.
In one embodiment, compensation device is by becoming longer and more compensating model waveform for subtracting each other to model waveform along with discharge time section.
More particularly, according to the present invention made based on test 1 and the test result of 2 and the deduction of inventor, in the example as shown in fig. 5, extracting pressure waveform Wn to deduct the model waveform CALn-1 that sprays corresponding to (n-1) stage in the waveform W by detecting when the multistage sprays, becoming longer by the discharge time section of spraying along with the n-th stage and more carry out decay and carry out compensation model waveform CALn-1.
According to the present invention, due to the actual waveform W0n-1 that model waveform CALn-1 can be made to obtain close to the waveform W0n detected during by deducting for the n-th stage in the waveform W that detects when the multistage sprays and spraying separately further, therefore, the pressure waveform Wn caused by the n-th stage injection (target injection) is extracted the waveform W that can detect when the multistage sprays exactly.
According to a further aspect in the invention, provide a kind of fuel pressure waveform acquisition device for fuel injection system, described fuel injection system comprises injection valve and fuel pressure sensor, described injection valve is used for fuel to be ejected into internal-combustion engine from the spray-hole of described injection valve, described fuel pressure sensor is used as pressure waveform for the time variations detecting the fuel pressure in the fuel feed passage of leading to described spray-hole, the time variations of described fuel pressure causes due to the injection of described fuel from described spray-hole, described fuel pressure waveform acquisition device comprises: pressure waveform acquisition device, it is for obtaining the first pressure waveform detected by described fuel pressure sensor, as the multistage jet pressure waveform occurred when performing multistage fuel and spraying, in described multistage fuel sprays, fuel described in multi-injection during each burning cycle of described internal-combustion engine, model Waveform storage device, it is for memory model waveform, described model waveform is the specification of the second pressure waveform, described second pressure waveform is assumed to be at execution and is in the comparatively early-injection in comparatively early stage compared with target injection and does not perform appearance when described target is sprayed, and described target injection is that the second stage in the injection of described multistage is sprayed or late phase is sprayed, waveform extracting device, it sprays by described target the 3rd pressure waveform caused to extract for deducting described model waveform from described multistage jet pressure waveform, and compensation device, it is for the described model waveform by described model waveform attenuating one dough softening being compensated for deducting described in execution, the described dough softening depends on from the described injection interval sprayed to described target compared with early-injection, wherein, described compensation device be configured to only for the part of described model waveform to change the described dough softening, when a described part for described model waveform is assumed that and sprays from the described target of execution, pressure wave occurs after completing when being reflected in described fuel feed passage and once coming and going required past time.
Accompanying drawing explanation
In the accompanying drawings:
Fig. 1 is the figure of the structure of the fuel injection system schematically showing the fuel pressure waveform acquisition device comprised according to the embodiment of the present invention;
Fig. 2 shows the flow chart of the step of the fuel injection control process performed by fuel injection system;
Fig. 3 shows the flow chart of the step of the fuel-injection condition testing process performed by fuel pressure waveform acquisition device;
When Fig. 4 shows that single phase, fuel sprayed the pressure waveform that detects and single phase, fuel sprayed time Spraying rate transition waveforms between the time diagram of relation;
Fig. 5 explains the time diagram that operation is removed in fluctuation included in the fuel pressure testing process shown in Fig. 3;
Fig. 6 explains the time diagram that operation is removed in fluctuation included in the fuel pressure testing process shown in Fig. 3;
Fig. 7 shows the time diagram of the relation between the dough softening of pulse amplitude in fuel injection interval and the pressure waveform that detects;
Fig. 8 shows the flow chart that the step of operation is removed in fluctuation;
Fig. 9 shows the plotted curve of the relation between the offset c of the damping coefficient k of injection interval and model waveform;
Figure 10 shows the time diagram of the relation between the specific part of elapsed time and model waveform;
Figure 11 shows the plotted curve of the result of the test 1 performed by present inventor; And
Figure 12 shows the plotted curve of the result of the test 2 performed by present inventor.
Embodiment
Fig. 1 schematically shows the structure of the fuel injection system for on-vehicle internal combustion engine, and this system comprises the fuel pressure waveform acquisition device according to the embodiment of the present invention.In this embodiment, internal-combustion engine be for perform compression autoignition burning there is the diesel engine of cylinder #1 to cylinder #4.Fuel injection system carries out operating fuel under high pressure to be ejected in cylinder #1 to cylinder #4.
In FIG, reference character 10 represents the Fuelinjection nozzle be arranged on each cylinder #1 to #4, and 20 represent the fuel pressure sensor be arranged on Fuelinjection nozzle 10, and 30 represent the ECU (electronic control unit) 30 be arranged on vehicle.Fuel pressure waveform acquisition device is implemented by ECU30.Fuel injection system operates, and makes to be stored in fuel in fuel tank 40 and is fed to common rail 42 as accumulator by high-pressure service pump 41, and be assigned to the Fuelinjection nozzle 10 of each cylinder via high-voltage tube 43.
Fuelinjection nozzle 10 comprises main body 11, pin 12 and the o 13 as actuator.Main body 11 is formed with high-pressure channel 11a therein.The fuel being fed to Fuelinjection nozzle 10 from common rail 42 through high-pressure channel 11a with injected from spray-hole 11b.Part of fuel in high-pressure channel 11a flows in the back pressure chamber 11c of main body 11 inside formation.The Leak hole 11d of back pressure chamber 11c is opened and closed by control valve 14.Control valve 14 is opened and closed by o 13.Pin 12 is applied in the elastic force of spring 15 and the fuel pressure along valve closing direction of back pressure chamber 11c, and is applied in the fuel pressure along valve opening direction of the fuel receiver 11f that high-pressure channel 11a inside is formed.
Fuel pressure sensor 20 is arranged on (such as, in high-voltage tube 43 or high-pressure channel 11a) in the fuel feed lines between common rail 42 and spray-hole 11b, in order to detect fuel pressure.In this embodiment, fuel pressure sensor 20 is arranged on the attachment portion between high-voltage tube 43 and main body 11.Alternately, fuel pressure sensor 20 also can as installed on the main body 11 by shown by the dot and dash line in Fig. 1.Each Fuelinjection nozzle 10 of cylinder #1 to #4 is provided with fuel pressure sensor 20.
Next, the running with the Fuelinjection nozzle 10 of said structure is explained.When o 13 is de-energized, control valve 14 is closed by the elastic force of spring 16.In this state, because the fuel pressure of back pressure chamber 11c is higher, so pin 12 is closed, eject from spray-hole 11b to prevent fuel.On the other hand, when o 13 is energized, control valve 14 resists the elastic force of spring 16 and opens.In this state, because the fuel pressure in back pressure chamber 11c is lower, so pin 12 is opened, eject from spray-hole 11b to make fuel.
When by performing fuel injection to o 13 energising, the fuel flow to back pressure chamber 11c from high-pressure channel 11a is released to low-pressure channel 11e by Leak hole 11d.That is, when performing fuel and spraying, the fuel in high-pressure channel 11a is always leaked in low-pressure channel 11e by back pressure chamber 11c.
ECU30 is by controlling to control spray regime to the energising of o 13 with the opening and closing controlling pin 12 thus.More particularly, ECU30 is based on the rotating speed, engine loading etc. of engine output shaft, calculate the target jet mode comprising the injection beginning moment, spray finish time and fuel injection amount, and control the energising to o 13, realize calculated target jet mode.
Next, with reference to the flow chart of figure 2, explain by ECU30 perform for controlling the energising of o 13 to control the process of fuel-injection condition thus.
This process starts in step S11, and in step s 11, reading displayed goes out the predefined parameter of engine operating status, and this parameter comprises engine speed, engine loading and is fed to the pressure of fuel of Fuelinjection nozzle 10.
At step S12 subsequently, set optimum target jet mode based on the parameter read in step S11.Target setting pattern can be carried out, various jet modes best the various combinations prestored in spraying fire mapping graph for parameter value by reference to spraying fire figure.By demonstrating the parameter objective definition jet mode of injection phase number (number of times that the fuel that each burning cycle will perform sprays), injection beginning moment, discharge time section (fuel injection amount) etc.That is, spraying fire figure shows the relation between these parameters and best jet mode.
At step S13 subsequently, the o 13 of Fuelinjection nozzle 10 will be outputted to according to the injection command signal of the target jet mode set in step s 12.As a result, perform fuel injection control, jet mode is become for jet mode best by the current engine operating state shown in the parameter read in step S11.
But due to the individual difference between ageing deterioration or Fuelinjection nozzle 10, actual jet mode likely departs from target jet mode.Correspondingly, injection command signal is compensated, to make actual jet mode (actual spray regime) consistent with target jet mode.As described later, actual jet mode can be detected based on the output value of fuel pressure sensor 20.In addition, in this embodiment, executed signal compensation is learnt, and use learning value to calculate injection command signal next time.
Next, with reference to the flow chart of figure 3, explain the process being used for detecting (calculating) actual ejection state based on the output value of fuel pressure sensor 20.
This process is performed by the microcomputer of ECU30 at each predetermined computing cycle or each predetermined crankangle.This process starts in step S21, in the step s 21, reads the output value representing the fuel pressure detected from the fuel pressure sensor 20 be arranged on cylinder #1 to #4.Preferably, the fuel pressure detected is subject to filtering.
Carry out the read operation in interpretation procedure S21 in detail with reference to the time diagram of figure 4, during the time diagram of Fig. 4 shows the time period be opened and closed once at spray-hole 11b, each is worth time dependent example.
The part (a) of Fig. 4 shows the injection command signal outputting to Fuelinjection nozzle 10 in the step S13 shown in Fig. 3.The pulse enable (pulse-on) sprayed in command signal is energized to o 13, and spray-hole 11b is opened.That is, in the beginning of pulse enable moment Is command injection, in the end of end-of-pulsing moment Ie command injection.Correspondingly, cycle T q can be opened by the valve controlling spray-hole 11b according to the pulse enable cycle of spraying command signal, thus control emitted dose Q.The part (b) of Fig. 4 shows by the time variations (transformation) spraying the fuel injection rate of ordering the spray-hole 11b caused.The part (c) of Fig. 4 shows the time variations of the output value (fuel pressure detected) of the fuel pressure sensor 20 caused by the transformation of fuel injection rate.
ECU30 performs the subroutine procedure different from the process shown in Fig. 3, to obtain the output value of fuel pressure sensor 20 with the time lag shorter than the process shown in Fig. 3, to make it possible to the track tracking the fuel pressure transition waveforms shown in the part (c) of Fig. 3.In this embodiment, read the output signal of fuel sensor 20 with the time lag (being preferably 20 μ s) shorter than 50 μ s, and one after the other gather the output value obtained thus in the step s 21.
Between the pressure waveform using fuel pressure sensor 20 to detect and the time variations of fuel injection rate, there is coherence described below.Correspondingly, the transient waveform of Spraying rate can be estimated according to the fuel pressure waveform detected.
In the example of the time variations of the fuel injection rate shown in the part (b) of Fig. 4, o 13 starts to be energized at moment Is, thereafter fuel starts to be ejected by from spray-hole 11b, and as a result, fuel injection rate starts at change point R3 place to increase.That is, start actual fuel to spray.Thereafter, Spraying rate reaches its maximum value at change point R4 place, stops increasing at change point R4 place Spraying rate.This is because needle-valve 20c starts to promote at change point R3, and the amount promoted at change point R4 place reaches its maximum value.
In this article, term " change point " is defined as follows.Calculate the second-order differential value of Spraying rate (or the fuel pressure detected by fuel pressure sensor 20).The second-order differential value calculated is reached the point of extreme value, namely the flex point of the waveform of second-order differential value is defined as the change point of Spraying rate (or the fuel pressure detected).
At o 13 after the moment, Te was de-energized, Spraying rate starts to reduce at change point R7.Thereafter, the change point R8 place vanishing of Spraying rate at the end of the injection of reality.This is because needle-valve 28 starts to fall at change point R7 place, and be fully closed at change point R8 place spray-hole 11b.
In the example of the time variations of the fuel pressure detected by fuel pressure sensor 20 shown in the part (c) of Fig. 4, the fuel pressure before change point P1 equals the fuel supply pressure of P0.Answer o 13 owing to being provided by driving current, after the moment Is that fuel injection command is output and at Spraying rate, start the change point P1 place before the change point R3 increased, fuel pressure starts to reduce.This is because control valve 14 opens Leak hole 11d at change point P1 place, as a result, the pressure of back pressure chamber 11c reduces.Thereafter, the reduction of the fuel pressure started at change point P1 temporarily stopped at change point P2.This is because Leak hole 11d is fully opened, as a result, depend on that the leak-down rate of the diameter of the opened areas of Leak hole 11d becomes constant.
Subsequently, because Spraying rate starts to increase at change point R3, so the fuel pressure detected starts to reduce at change point P3.Thereafter, Spraying rate reaches its maximum value at change point R4, and as a result, the reduction of the fuel pressure detected stopped at change point P4.Be greater than from change point P3 to the decrease during the time period of change point P4 from change point P1 to the decrease during the time period of change point P2.
Subsequently, the fuel pressure detected starts to increase at change point P5.This is because control valve 14 closes Leak hole 11d, as a result, the pressure increase of back pressure chamber 11c.Thereafter, the increase of the fuel pressure detected started at change point P5 temporarily stopped at change point P6.
Subsequently, because Spraying rate starts to reduce at change point R7, so the fuel pressure detected starts to increase at change point P7.Thereafter, Spraying rate reaches its maximum value at change point R8, and result is that the reduction of the fuel pressure detected stopped at change point P8.Be greater than from change point P5 to the decrease during the time period of change point P6 from change point P7 to the decrease during the time period of change point P8.The fuel pressure detected reduced repeatedly with the constant cycle of T10 and the mode that increases decays.
Carry out detection to above-mentioned change point P3, P4, P7 and P8 to make it possible to estimate: Spraying rate increases elapsed time R3 (time that actual ejection starts), maximum injection reaches time R4, Spraying rate reduces elapsed time R7 and Spraying rate reduces end time R8 (actual fuel sprays the time terminated).In addition, based on the relation between the explained change at Spraying rate and the change of the fuel pressure detected, the time variations of Spraying rate can be estimated according to the time variations of the fuel pressure detected below.
To the Spraying rate Magnification R α during the time period of change point R4, coherence is there is from change point P3 to the pressure reduction ratio P α during the time period of change point P4 and from change point R3.To the Spraying rate reduction rate R γ during the time period of change point R8, coherence is there is from change point P7 to the pressure increase rate P γ during the time period of change point P8 and from change point R7.Coherence is there is between pressure decrease amount P β (pressure maximum decrease) and Spraying rate increase R β (maximum injection rate).Correspondingly, can detected pressures reduction rate P α, pressure increase rate P γ and pressure maximum decrease P β the time variations of the fuel pressure detected from fuel sensor 20 be passed through, estimate Spraying rate Magnification R α, Spraying rate reduction rate R γ and maximum injection rate R β.As mentioned above, due to various state R3, R4, R7, R8, R α, R β, R γ of Spraying rate can be estimated, therefore can the time variations (transition waveforms) of the fuel injection rate shown in the part (b) of drawing for estimate 4.
The integral value (shown in the S of shadow region) of the Spraying rate between the beginning of actual ejection and end is corresponding to emitted dose Q.Coherence is there is, this is because the part of the transition waveforms of the fuel pressure detected corresponds to the actual ejection time period from start to end (part between change point P3 and change point P8) between the integral value S of Spraying rate and the integral value of the transition waveforms of fuel pressure detected.Correspondingly, can pass through to calculate pressure integral value the time variations of the fuel pressure detected from fuel sensor 20, estimate the Spraying rate integral value S corresponding to emitted dose Q.Therefore can say, fuel pressure sensor 20 serves the effect of spray regime sensor, and fuel pressure sensor 20 detects the pressure being supplied to the fuel of Fuelinjection nozzle 10, as the physical quantity relevant with spray regime.
Turn back to Fig. 3, in step S21 step S22 subsequently, determine that whether the current injection just detected is that second stage in spraying the multistage is sprayed or subsequent stage sprays.If the determination result in step S22 is affirmative, then this process proceeds to step S23, in step S23, performs fluctuation remove operation to the waveform obtained in step S21.Explain that operation is removed in this fluctuation below with reference to Fig. 5.
Part (a) in Fig. 5 shows when outputing order and performing the injection command signal of multistage injection (being two-stage injection in this embodiment), is sent to the time diagram of the driving current of o 13.Part (b) in Fig. 5 shows the figure of the waveform W of the fuel pressure detected when outputing the injection command signal shown in part (a).Part (c) in Fig. 5 shows, and when outputing the injection command signal that the order fill order stage sprays, is sent to the time diagram of the driving current of o 13.Part (d) in Fig. 5 shows the waveform of the fuel pressure detected when outputing the injection command signal shown in part (c).
Waveform W in part (part of being surrounded by the dot and dash line in part (b)) the last stage injection with it that it corresponds to the injection of the n-th stage, (spray, (n-2) stage sprays, the injection of (n-3) stage by (n-1) stage ...) repercussions overlap.The repercussions sprayed with (n-1) stage shown in the part (d) in Fig. 5 exemplarily, at (n-1) stage AEI After End of Injection, repeatedly increase with some cycles (in this example embodiment for T10) and to reduce and the perturbation waveform of decaying (waveform that surrounds of dot and dash line by part (d)) shows as repercussions.The part waveform (part of being surrounded by the dot and dash line in partly (b)) that n-th stage that corresponded in these repercussions (perturbation waveform) and waveform W sprays overlaps.Correspondingly, spray the time variations (transition waveforms shown in the part (b) of Fig. 4) of the Spraying rate caused if gone out based on the waveform W direct estimation detected by the n-th stage, then evaluated error can become very large.
Therefore, in step S23, perform fluctuation remove operation, in step S23, spray in the waveform W caused by the n-th stage the repercussions (perturbation waveform) deducted in comparatively early stage injection from what detect, spray by the n-th stage the pressure waveform Wn (part (f) see Fig. 5) caused to extract.
More particularly, obtain in advance and store single phase spray in the test result of various pattern as various perturbation waveform.This various pattern is included in the fuel pressure (fuel pressure when fuel injection beginning of injection beginning; P0 or P2 shown in Fig. 4) aspect single phase different from each other sprays, or spray corresponding to single phase different from each other in the emitted dose of valve opening time section Tq.To be obtained and the perturbation waveform adopting the form of mathematic(al) representation to represent is being included in the storage in ECU30 as model Waveform storage by test.
In this embodiment, with the form memory model waveform of formula (1) below, wherein, p is the value (normal value of the fuel pressure detected by fuel pressure sensor 20) of model waveform.In formula (1), parameter A, k, ω and θ are respectively the amplitude of damped vibration, damping coefficient, frequency and phase place.Alphabetical t in formula (1) represents elapsed time.The normal value p of the fuel pressure detected is obtained by the formula (1) of the function of the variable as elapsed time t.For each in different jet modes differently setup parameter A, k, ω and θ.
P＝Aexp(-kt)sin(ωt+θ)……(1)
Such as, in order to obtain the model waveform of the specification of the repercussions (perturbation waveform) sprayed as (n-1) stage, select the immediate model waveform of jet mode that jet mode and (n-1) stage spray in the various model waveforms stored from storage, and this model waveform be selected is set to the model waveform CALn-1 of the specification of the repercussions (perturbation waveform) sprayed as (n-1) stage.Dotted line in the part (e) of Fig. 5 represents model waveform CALn-1, and the solid line in the part (e) of Fig. 5 represents the waveform W detected.By deducting model waveform CALn-1 from the waveform W detected, extract the pressure waveform Wn shown in part (f) of Fig. 5.The pressure waveform Wn extracted thus does not comprise the perturbation waveform composition of the injection in comparatively early stage, correspondingly, pressure waveform Wn with is sprayed the Spraying rate caused by the n-th stage and changes there is coherence highly.
In the example shown in the part (e) of Fig. 5 and part (f), from the waveform W detected, only to deduct the model waveform CALn-1 representing the perturbation waveform that (n-1) stage sprays.But, the perturbation waveform that (n-2) stage sprays and earlier stage is sprayed can also be deducted from the waveform W detected.In the example shown in Fig. 6, from the waveform W detected, deduct the perturbation waveform (model waveform CALn-1 and model waveform CALn-2) that (n-1) stage sprays and (n-2) stage sprays.
Present inventor have been found that the reduction rate of the pulse amplitude A1 of the waveform W0n-1 detected depend on m (=(the n-1)) stage spray and the n-th stage spray between injection interval Tmn and change.
Fig. 7 shows the figure of the example of the relation between injection interval Tmn and reduction rate.As shown in Figure 7, the detection waveform W0n-1 that sprays of (n-1) stage comprises and sprays by (n-1) stage fuel pressure that causes and change Cn-1, and the detection waveform W0n that sprays of the n-th stage comprises and sprays by the n-th stage the fuel pressure change Cn caused.In the example shown in Fig. 7, partly (a), partly (b) and part (c) respectively illustrate situation when injection interval is Tmn1, Tmn2 and Tmn3, wherein Tmn1>Tmn2>Tmn3.
In the example shown in part (a) and part (c), detection waveform W0n-1 its trough with spray by the n-th stage the fuel pressure caused and change Cn and overlap.Correspondingly, because the pressure of the pressure wave outside spray-hole 11b becomes minimum herein, so the amplitude fading degree of detection waveform W0n-1 is greater than by the amplitude fading degree of model waveform CALn-1 before compensating.On the other hand, in the example shown in the part (b) of Fig. 7, detection waveform W0n-1 its node with spray by the n-th stage the fuel pressure caused and change Cn and overlap.Correspondingly, pressure due to the pressure wave outside spray-hole 11b is in the centre (value at flex point place) of change pressure, so the amplitude fading degree of detection waveform W0n-1 is less than by the amplitude fading degree of model waveform CALn-1 before compensating.
As mentioned above, in this embodiment, model waveform CALn-1 and CALn-2 selected is compensated for as the waveform being attenuated a dough softening, this dough softening depend on from the m stage be ejected into n-th the stage spray injection interval Tmn." dough softening " is corresponding to the damping coefficient k in formula (1).
Fig. 6 part (c) and part (d) shown in example in, model waveform CALn-1 and CALn-2 is compensated to make the waveform that their dough softening is larger.The part (c) of Fig. 6 and part (d) each in, dotted line k1 and dot and dash line k2 represents the asymptote of the crest of the Frontier Model waveform of compensation respectively, and along the asymptote of the crest of model waveform after compensating.When changing the damping coefficient k in formula (1), asymptotic slope is also changed.That is, when increasing damping coefficient k to increase the dough softening, asymptote k1 is changed to asymptote k2, and wherein, the slope of asymptote k2 is greater than k1.
Turn back to Fig. 3, in step S23 step S24 subsequently, when the whether timing of the determination result in step S22 (injection just detected if current is confirmed as being spray the first stage), just obtain the waveform of Pressure differential value by differentiating to the force value detected (pressure waveform), when the determination result in step S22 is affirmative (injection just detected if current is confirmed as being that second stage is sprayed or more late injection), just obtain the waveform of Pressure differential value by differentiating to the force value (pressure waveform) being subject to fluctuation removal operation detected.
Thereafter, in step S25 to step S28, use the differential pressure value obtained in step S24 to carry out the various spray regimes shown in part (b) of calculating chart 4.More particularly, calculate injection beginning time R3 in step s 25, calculate in step S26 and spray end time R8, calculate maximum injection in step s 27 and reach time R4 and Spraying rate reduction elapsed time R7, and in step S28, calculate maximum injection rate R β.Incidentally, when emitted dose is less, it is consistent each other that maximum injection reaches time R4 with Spraying rate reduction elapsed time R7.
In step S29 subsequently, calculate the integral value (shadow region S) of the Spraying rate terminated to actual ejection from actual ejection based on spray regime R3, R8, R β, R4 and R7c of calculating in step S25 to step S29, and this integral value this calculated is defined as actual emitted dose Q.When emitted dose is larger, the shape of region S is close to trapezoidal, and when emitted dose is less, the shape of region S is close to triangle.Except based on except spray regime R3, R8, R β, R4 and R7, the integral value S (emitted dose Q) of Spraying rate can also be calculated based on the Spraying rate Magnification R α calculated from pressure waveform and Spraying rate reduction rate R γ.
Next, operation is removed in the fluctuation coming to perform in interpretation procedure S23 with reference to figure 8.The step operated is removed in the fluctuation that Fig. 8 shows as subroutine process.This operation, from step S31, in step S31, obtains injection beginning fuel pressure P0m and emitted dose Qm that the m stage sprays.Emitted dose Qm can be the emitted dose calculated in the step S29 shown in Fig. 3, or can be estimate to obtain based on opening cycle T qm according to the valve spraying command signal.
In step S32 subsequently, select model waveform CALm in each model waveform stored from storage, the jet mode of this model waveform CALm is closest to the jet mode defined by the injection beginning fuel pressure P0m obtained in step S31 and emitted dose Qm.In step S33 subsequently, determine the part of the current model waveform CALm just processed be whether be assumed that in model waveform CALm spray from the n-th stage compensation waiting time of terminating to start in the past after and compensate start before the part of appearance.In this embodiment, compensating the waiting time is that pressure wave leaves fuel sensor 20, propagates in high-voltage tube 43 and high-pressure channel 11a, reflected and turn back to the time required for fuel sensor 20 by the anastomosis part between common rail 42 and high-voltage tube 43.If the determination result in step S33 is affirmative, then operation proceeds to step S34, otherwise just proceeds to step S36.
The present inventor has been found that, the pressure waveform occurred when the execution m stage sprays itself and the n-th stage spray be performed time part corresponding to pressure wave outside spray-hole 11b the most strongly affecting of being subject to that the n-th stage sprayed, but, just there is no much impacts when the n-th stage sprayed.This is because, flow to the fuel that the fuel supplement of spray-hole 11b injection period ejects from spray-hole 11b.The present inventor also finds, the impact that the n-th stage sprayed is tended to occur after pressure wave is reflected in high-voltage tube 43 and high-pressure channel 11a.
In step S34, obtain from the m stage based on the injection command signal of spraying for m stage and the n-th stage and sprays the injection interval Tmn of end to the n-th stage injection beginning.In step S35 subsequently, based on the injection interval Tmn obtained in step S34, the damping coefficient k of the model waveform CALm selected in step S32 is compensated.
Fig. 9 shows for the relation (offset data) between the offset c of damping coefficient k and injection interval Tmn.Obtain this relation by test, and this relation is stored in the storage of ECU30 with the form of performance plot.Offset c is determined based on the injection interval Tmn obtained in step S34 with reference to performance plot.Damping coefficient k in formula (1) is compensated for as k × c, with compensation model waveform CALn-1.According to the performance plot shown in Fig. 9, the pressure transformation period section of the model waveform CALn-1 according to injection interval Tmn is depended in the change of offset c.That is, the change of the dough softening is based on the pressure size of the model waveform CALn-1 at spray-hole 11b place when opening spray-hole 11b and spraying to perform for the n-th stage.
When the model waveform CALn-2 deducting (n-2) stage from the waveform W detected sprays by the n-th stage the pressure waveform Wn caused to extract, with reference to the performance plot shown in figure 9, the injection interval Tmn sprayed based on n-th stage that was ejected into from (n-1) stage and be ejected into from (n-2) stage injection interval Tmn that the n-th stage sprayed and determine the corrected value c of the damping coefficient k of the model waveform CALn-2 of (n-2), in order to compensate the waveform CALn-2 of (n-2).
In step S36 subsequently, deduct in the detection waveform W obtained from the step S21 shown in Fig. 3 in step s 35 by the model waveform CALm (being CALn-1 and CALn-2 in the example shown in Fig. 6) compensated.Subtracted each other by this and shown in part (f) that the waveform that obtains corresponds to Fig. 5 or Fig. 6 part (e) shown in spray by the n-th stage the pressure waveform Wn caused.
Above mentioned embodiment provide following advantage.
The change detecting the reduction rate of the pulse amplitude A1 of waveform W0n-1 obtained is depended on from m (=(the n-1)) stage and is ejected into the injection interval Tmn that the n-th stage sprayed, find based on this, by a dough softening that model waveform CALn-1 is decayed, model waveform CALn-1 is compensated, in order to extract the pressure waveform Wn caused by the n-th stage injection (target injection), wherein, this dough softening depend on from (n-1) stage be ejected into n-th the stage spray injection interval.Based on being ejected into the injection interval Tmn of the n-th stage injection from (n-1) stage and being ejected into the injection interval Tmn of the n-th stage injection from (n-2) stage, the damping coefficient k of model waveform CALn-2 is compensated.
This make it possible to model waveform CALn-1 closer to Fig. 5 part (d) shown in the waveform W0n-1 that obtains of detection, the waveform W0n detected this waveform W0n-1 is by deducting for the n-th stage and spraying separately in the waveform W that detects when the multistage sprays time obtains, and extract the pressure waveform Wn caused by the n-th stage injection (target injection) the waveform W that correspondingly, can detect when the multistage sprays exactly.Correspondingly, according to this embodiment, due to actual spray regime R3, R8, R β, R4, R7 and Q can be detected exactly, so Driving Torque and the emissions status of motor with high accuracy can be controlled.
The pressure size of the model waveform CALn-1 when opening spray-hole 11b and spraying to perform for the n-th stage at spray-hole 11b place is depended in the change of the dough softening.Correspondingly, according to the pressure size of the pressure wave when opening spray-hole 11b and spraying to perform for the n-th stage outside spray-hole 11b, the dough softening of model waveform CALn-1 can suitably be changed.
The period of change of itself according to injection interval Tmn is depended in the change of the model waveform CALn-1 dough softening.Correspondingly, according to the pressure transformation period section of pressure wave propagating into spray-hole 11b when opening spray-hole 11b, the dough softening of model waveform CALn-1 can suitably be changed.
Part only in model waveform CALn-1 (this part be pressure wave come and go from high-voltage tube 43 to high-pressure channel 11a required back and forth time terminate after the part that occurs), model waveform CALn-1 is compensated.Correspondingly, can prevent the part model waveform CALn-1 to compensating from compensating.Incidentally, this restriction to compensating can be saved.
Other embodiments
Certainly, various amendment can be made to above-described embodiment as described as follows.
In the above embodiments, compensated by the whole part of a dough softening to model waveform CALn-1 that the whole part of model waveform CALn-1 is decayed, this dough softening depend on from (n-1) stage be ejected into n-th the stage spray injection interval Tmn.But, also can the specific part of only attenuation model waveform CALn-1, this specific part corresponds to the pressure when opening spray-hole 11b and spraying to perform for the n-th stage in the appearance of spray-hole 11b place.Figure 10 shows the time diagram of the relation between institute's transit time and this specific part.As shown in Figure 10, the part pressure waveform (or by shown in dotted line by the part model waveform CALn-1 before compensation) that the part of pressure wave may have a strong impact on the appearance when execution (n-1) stage sprays to spray-hole 11b outside is there is when the n-th stage sprayed.More particularly, the waveform W0n-1 detected when (n-1) stage sprays may be affected, and the amplitude of its part corresponding with the pressure wave when the n-th stage sprayed outside spray-hole 11b is reduced.According to said structure, owing to being attenuated by the specific part Tr1-Tr5 shown in dotted line in model waveform CALn-1, so model waveform CALn-1 can be made further close to the actual waveform W0n-1 detected, wherein, above-mentioned specific part Tr1-Tr5 is corresponding to the pressure occurred at spray-hole 11b place when opening spray-hole 11b carrying out the injection of the n-th stage.Incidentally, such compensation can come together with the compensation performed in the above embodiments to perform.
As shown in Figure 10, the border of specific part Tr1 to the Tr5 corresponding with the pressure occurred at spray-hole 11b place when opening spray-hole 11b carrying out the injection of the n-th stage thickens due to the interreflection of pressure wave, therefore, the scope of specific part Tr increases (Tr1<Tr2<Tr3<Tr4LE ssT.LTssT.LTTr5) in time.By increasing the scope of specific part Tr in time, the impact of pressure wave interreflection can be reflected in model waveform CALn-1.
With reference to Figure 11, as previously described, the present inventor finds, the increase of the discharge time section Tqn that the reduction rate of the pulse amplitude A1 of the waveform W0n-1 detected was sprayed with the n-th stage and reducing.In view of this discovery, can executable operations, this operation is used for compensating the waveform CALn-1 selected and waveform CALn-2, to become the increase of the discharge time Tqn sprayed along with the n-th stage and more waveform of decaying.That is, the damping coefficient k of selected model waveform CALm can be compensated according to discharge time section Tqn.According to this structure, due to can make model waveform CALn-1 close to Figure 11 part (d) shown in the waveform W0n-1 detected, wherein, the waveform W0n detected this waveform W0n-1 is by deducting for the n-th stage and spraying separately in the waveform W that detects when the multistage sprays time obtains, and sprays the pressure waveform Wn that (target injection) cause so detect when can spray from the multistage with high accuracy the waveform W obtained to extract by the n-th stage.Therefore, due to actual spray regime R3, R8, R β, R4, R7 and Q can be detected, so with high accuracy can control Driving Torque and the emissions status of motor with high accuracy.
In the above embodiments, the model waveform CAL represented by formula (1) is stored together from the different value of parameters A, k, ω and θ for different jet mode (such as injection beginning fuel pressure and emitted dose), and the formula (1) made it possible to according to the function as transit time t calculates the normal value p of detected pressures.But normal value p itself also can be stored in figure for often kind of jet mode provides or analog as the function of transit time t, makes these figure can be used as model waveform.
In the above-described embodiments, Fuelinjection nozzle 10 has following structure, and wherein control valve 14 is reversible valves, and fuel always lets out from back pressure chamber 11c when pin 12 is opened.But control valve 14 also can be three-way valve, even lets out from back pressure chamber 11c in fuel injection period in order to prevent fuel.
Preferred embodiment explained above is the example of the invention of the application described uniquely by appended claim.It should be understood that can as those skilled in the art do various amendment is made to preferred embodiment.
Claims (9)
1. the fuel pressure waveform acquisition device for fuel injection system, described fuel injection system comprises injection valve and fuel pressure sensor, described injection valve is used for fuel to be ejected into internal-combustion engine from the spray-hole of described injection valve, described fuel pressure sensor is used as pressure waveform for the time variations detecting the fuel pressure in the fuel feed passage of leading to described spray-hole, the time variations of described fuel pressure causes due to the injection of described fuel from described spray-hole, and described fuel pressure waveform acquisition device comprises:
Pressure waveform acquisition device, it is for obtaining the first pressure waveform detected by described fuel pressure sensor, as the multistage jet pressure waveform occurred when performing multistage fuel and spraying, in described multistage fuel sprays, fuel described in multi-injection during each burning cycle of described internal-combustion engine;
Model Waveform storage device, it is for memory model waveform, described model waveform is the specification of the second pressure waveform, described second pressure waveform is assumed to be at execution and is in the comparatively early-injection in comparatively early stage compared with target injection and does not perform appearance when described target is sprayed, and described target injection is that the second stage in the injection of described multistage is sprayed or late phase is sprayed;
Waveform extracting device, it sprays by described target the 3rd pressure waveform caused to extract for deducting described model waveform from described multistage jet pressure waveform; And
Compensation device, it is for the described model waveform by described model waveform attenuating one dough softening being compensated for deducting described in execution, and the described dough softening depends on from the described injection interval sprayed to described target compared with early-injection,
Wherein, described compensation device is configured to decay to the specific part of described model waveform, and described specific part corresponds to and is opened to perform the pressure occurred at described spray-hole place when described target is sprayed at described spray-hole.
2. fuel pressure waveform acquisition device according to claim 1, wherein, described compensation device is constructed to be opened to perform when described target is sprayed according to described spray-hole change the described dough softening in the pressure size of the described model waveform at described spray-hole place.
3. fuel pressure waveform acquisition device according to claim 1 and 2, wherein, described compensation device is constructed to change the described dough softening according to the pressure transformation period section of the described model waveform depending on described injection interval.
4. fuel pressure waveform acquisition device according to claim 1 and 2, wherein, described compensation device is configured to as time goes by and increases the scope of the described specific part of described model waveform.
5. fuel pressure waveform acquisition device according to claim 1 and 2, wherein, described compensation device is configured to compensate for the described described model waveform deducted by becoming longer and more described model waveforms of decaying along with described discharge time section.
6. the fuel pressure waveform acquisition device for fuel injection system, described fuel injection system comprises injection valve and fuel pressure sensor, described injection valve is used for fuel to be ejected into internal-combustion engine from the spray-hole of described injection valve, described fuel pressure sensor is used as pressure waveform for the time variations detecting the fuel pressure in the fuel feed passage of leading to described spray-hole, the time variations of described fuel pressure causes due to the injection of described fuel from described spray-hole, and described fuel pressure waveform acquisition device comprises:
Pressure waveform acquisition device, it is for obtaining the first pressure waveform detected by described fuel pressure sensor, as the multistage jet pressure waveform occurred when performing multistage fuel and spraying, in described multistage fuel sprays, fuel described in multi-injection during each burning cycle of described internal-combustion engine;
Model Waveform storage device, it is for memory model waveform, described model waveform is the specification of the second pressure waveform, described second pressure waveform is assumed to be at execution and is in the comparatively early-injection in comparatively early stage compared with target injection and does not perform appearance when described target is sprayed, and described target injection is that the second stage in the injection of described multistage is sprayed or late phase is sprayed;
Waveform extracting device, it sprays by described target the 3rd pressure waveform caused to extract for deducting described model waveform from described multistage jet pressure waveform; And
Compensation device, it is for the described model waveform by described model waveform attenuating one dough softening being compensated for deducting described in execution, and the described dough softening depends on from the described injection interval sprayed to described target compared with early-injection,
Wherein, described compensation device be configured to only for the part of described model waveform to change the described dough softening, a described part for described model waveform is assumed that from performing when described target is sprayed, pressure wave completes when being reflected in described fuel feed passage and once comes and goes the required time and occur in the past.
7. fuel pressure waveform acquisition device according to claim 6, wherein, described compensation device is constructed to be opened to perform when described target is sprayed according to described spray-hole change the described dough softening in the pressure size of the described model waveform at described spray-hole place.
8. the fuel pressure waveform acquisition device according to claim 6 or 7, wherein, described compensation device is constructed to change the described dough softening according to the pressure transformation period section of the described model waveform depending on described injection interval.
9. the fuel pressure waveform acquisition device according to claim 6 or 7, wherein, described compensation device is configured to compensate for the described described model waveform deducted by becoming longer and more described model waveforms of decaying along with described discharge time section.
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| JP2012026993A JP5635022B2 (en) | 2012-02-10 | 2012-02-10 | Fuel pressure waveform acquisition device |
| JP2012-026993 | 2012-02-10 |
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| JP6555093B2 (en) * | 2015-11-11 | 2019-08-07 | 株式会社デンソー | Fuel injection state estimation device |
| DE102017005783B4 (en) * | 2017-06-20 | 2021-12-02 | Mtu Friedrichshafen Gmbh | Method for model-based control and regulation of an internal combustion engine |
| IT201700114678A1 (en) * | 2017-10-11 | 2019-04-11 | Torino Politecnico | Injection system, apparatus and method to control the quantity of fuel injected |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450258A (en) * | 2002-03-11 | 2003-10-22 | 三菱自动车工业株式会社 | Divided fuel injection control apparatus |
| JP2004068616A (en) * | 2002-08-01 | 2004-03-04 | Nippon Soken Inc | Accumulator fuel injection device |
| CN102287289A (en) * | 2010-06-18 | 2011-12-21 | 株式会社电装 | Fuel-pressure waveform detector |
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| JP4244683B2 (en) * | 2002-06-24 | 2009-03-25 | トヨタ自動車株式会社 | Fuel injection device for internal combustion engine |
| DE102006042098B3 (en) | 2006-09-07 | 2008-05-21 | Siemens Ag | Method for determining a correction of a partial injection quantity of an internal combustion engine |
| JP4428427B2 (en) * | 2007-08-31 | 2010-03-10 | 株式会社デンソー | Fuel injection characteristic detecting device and fuel injection command correcting device |
| JP4631937B2 (en) * | 2008-06-18 | 2011-02-16 | 株式会社デンソー | Learning device and fuel injection system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450258A (en) * | 2002-03-11 | 2003-10-22 | 三菱自动车工业株式会社 | Divided fuel injection control apparatus |
| JP2004068616A (en) * | 2002-08-01 | 2004-03-04 | Nippon Soken Inc | Accumulator fuel injection device |
| CN102287289A (en) * | 2010-06-18 | 2011-12-21 | 株式会社电装 | Fuel-pressure waveform detector |
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| CN103244296A (en) | 2013-08-14 |
| JP2013163999A (en) | 2013-08-22 |
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