CN104105862B - Abnormity determining device and abnormality determination method for fuel feed system - Google Patents
Abnormity determining device and abnormality determination method for fuel feed system Download PDFInfo
- Publication number
- CN104105862B CN104105862B CN201380005293.6A CN201380005293A CN104105862B CN 104105862 B CN104105862 B CN 104105862B CN 201380005293 A CN201380005293 A CN 201380005293A CN 104105862 B CN104105862 B CN 104105862B
- Authority
- CN
- China
- Prior art keywords
- fuel
- cylinder
- pressure
- determining device
- fuel pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 424
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005856 abnormality Effects 0.000 title claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 99
- 230000007423 decrease Effects 0.000 claims abstract description 95
- 230000002159 abnormal effect Effects 0.000 claims abstract description 93
- 238000002347 injection Methods 0.000 claims abstract description 51
- 239000007924 injection Substances 0.000 claims abstract description 51
- 230000006835 compression Effects 0.000 claims abstract description 30
- 238000007906 compression Methods 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims description 21
- 239000007921 spray Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 5
- 239000002360 explosive Substances 0.000 description 34
- 230000008859 change Effects 0.000 description 17
- 238000005507 spraying Methods 0.000 description 9
- 239000012190 activator Substances 0.000 description 8
- 230000009467 reduction Effects 0.000 description 7
- 239000002828 fuel tank Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000010349 pulsation Effects 0.000 description 4
- 238000010009 beating Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000003292 diminished effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012886 linear function Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Abstract
A kind of abnormity determining device for fuel feed system and abnormality determination method, during the detection period in the moment (time point t12) before will starting including: fuel from the intermediate time (time point t11) between the respective compression top dead center moment of two cylinders of continuous print each other of ignition order among each cylinder a to cylinder slower to ignition order among these cylinders injection, the press detection sensor by arranging by the way of corresponding with the cylinder slower with described ignition order detects fuel pressure, and decrease speed based on detected fuel pressure PQ determines whether fuel abnormal leakage.
Description
Technical field
The present invention relates to design for fuel feed system and judge to supply fuel to each cylinder of explosive motor
Fuel feed system has occurred abnormity determining device and the abnormality determination method of fuel abnormal leakage the most.
Background technology
The fuel feed system of the direct injection internal combustion engine directly sprayed and supply the fuel in each cylinder is equipped with storage
Deposit by being sent by pump pressure and the pressure accumulation pipeline of pressurized fuel (common rail and conveying pipe), and the most each cylinder and arrange
And it is connected respectively to the Fuelinjection nozzle of Accumulator vessel.These Fuelinjection nozzles self-driven are opened by each, and thereby fuel is arbitrarily
Moment sprays and is supplied in each cylinder of explosive motor.
Here it should be noted that it may happen that fuel is outside different to it from the internal leakage of above-mentioned fuel feed system
Often (fuel abnormal leakage).Generally, it has been suggested that determine whether to occur the abnormity determining device (example of this fuel abnormal leakage
As, see Japanese Patent Application No.6-213051 (JP-6-213051A)).In the case of above-mentioned fuel abnormal leakage,
Even if the fuel pressure in fuel feed system also declines when Fuelinjection nozzle is not driven and opens.Therefore, fuel supply system
The decrease speed of the fuel pressure within Tong is higher than when not yet there is fuel abnormal leakage.Above-mentioned Japanese Patent Application
Device described in No.6-213051 (JP-6-213051A) is detecting this fuel feed system (more specifically, pressure accumulating tube
Road) the decline degree of internal fuel pressure and fuel pressure is judged to fuel abnormal leakage time big.
When explosive motor operates, each Fuelinjection nozzle is each driven intermittently and opens, and fuel is from fuel
Spray in feed system (more specifically, Fuelinjection nozzle) and be supplied in each cylinder.Therefore, the combustion in fuel feed system
The material execution sprayed due to this intermittent fuel of pressure and pulse.Correspondingly, during explosive motor operates, fuel supply system
Between fuel pressure in system declines due to the pressure because causing from the injection of the fuel of each Fuelinjection nozzle and sprays because of fuel
Have a rest and perform the pulsation that causes and change.
Even if to this end, the decline degree of the fuel pressure in fuel feed system is due in order to determine whether to occur
Fuel abnormal leakage and detect fuel pressure and become big in the case of, it is also difficult to the decline judging fuel pressure is to be attributable to combustion
The generation of material abnormal leakage is still attributable to the pressure fluctuation in fuel feed system.Correspondingly, even if only detecting pressure accumulation
During fuel pressure in pipeline, it is also difficult to determine whether accurately fuel abnormal leakage.
Summary of the invention
The invention provides can drop mode based on fuel pressure and accurately determine whether to occur abnormal leakage
Abnormity determining device and abnormality determination method for fuel feed system.
Abnormity determining device in one aspect of the present invention is applicable to have the storage storing the fuel being in pressurized state
The cylinder of pressure vessel and respectively direct injection internal combustion engine and arrange and be connected respectively to the fuel injection of described Accumulator vessel
The fuel feed system of valve, and judge described fuel feed system has occurred the most fuel abnormal leakage.
When Fuelinjection nozzle is opened, the fuel pressure in fuel feed system temporarily declines.Additionally, work as Fuelinjection nozzle
During closedown, fuel pressure stops declining due to the injection of this fuel, but fuel pressure is pulsed immediately after, and fuel supply
Fuel pressure in system continues variation a period of time.But, make to inject fuel into each cylinder if attention is focusing only on
Among the region that links of Fuelinjection nozzle and the pressure accumulation pipeline of a cylinder (specific cylinder) in fuel pressure on, then in combustion
Material injection valve produces pressure fluctuation after being driven cut out immediately.But, pressure fluctuation is driven again reaching Fuelinjection nozzle
The dynamic moment opened is (more specifically, the compression top dead center of cylinder the most preceding with ignition order [immediately preceding front air cylinder] and spy
Determine the moment that the intermediate point between the compression top dead center of cylinder is corresponding) time almost restrain.
In above-mentioned abnormity determining device, the cylinder of the most described explosive motor and pressure detecting portion is set, described
Pressure detecting portion for detection in described fuel feed system than described Accumulator vessel closer to described Fuelinjection nozzle side
Region and the spray-hole of described Fuelinjection nozzle between region (specific region) in fuel pressure.Accordingly, it is capable to lead to respectively
Cross these pressure detecting portion and detect the fuel pressure in the region making each Fuelinjection nozzle and pressure accumulation pipeline link.
Additionally, in above-mentioned abnormity determining device, at two cylinders of continuous print each other of ignition order among described cylinder
Intermediate time between the respective compression top dead center moment of (such as, above-mentioned immediately preceding front air cylinder and described specific cylinder) to
Fuel in the cylinder (specific cylinder) that among these cylinders, ignition order is slower sprays the inspection in the moment before will starting
Surveying in the period, the described pressure detecting portion arranged by the cylinder slower for described ignition order detects above-mentioned specific region
Interior fuel pressure.It is then based on the drop mode of the fuel pressure in detected described specific region to judge described combustion
The most there is fuel abnormal leakage in material feed system.Therefore, because spraying the fuel caused from the fuel of Fuelinjection nozzle
During the period that the amplitude of fluctuation of pressure has diminished, the fuel pressure in above-mentioned specific region is detected, and judges fuel supply system
System has occurred fuel abnormal leakage the most.Accordingly, it is capable to suitably catch the fuel pressure caused because of fuel abnormal leakage
Power declines.Accordingly, it is capable to drop mode based on fuel pressure accurately determines whether abnormal leakage.
In above-mentioned abnormity determining device, the decrease speed of fuel pressure can be calculated during the described detection period as institute
State drop mode, and can be judged to when described decrease speed is higher than predetermined distinguishing speed occur the leakage of described fuel different
Often.Therefore, if the decrease speed of fuel pressure is high owing to the fuel in fuel feed system leaks, then can determine that as sending out
Raw fuel abnormal leakage.
If it is assumed that one of detected value of fuel pressure has been when calculating the decrease speed of fuel pressure during the detection period
Produce certain error, then the impact of this error is shortened along with the detection period and is increased.Correspondingly, deduction determines whether to fire
Material abnormal leakage precision detect the period in short-term than detection time segment length time low.
In above-mentioned abnormity determining device, can change during the described detection period based on the described length detecting the period
The decrease speed of fuel pressure.It is therefoie, for example, when detecting the period in short-term, the impact on above-mentioned decrease speed is big, and therefore can lead to
Cross and decrease speed is changed into low speed reduce the probability being judged to fuel abnormal leakage.So, can be according to
The length of detection period changes decrease speed to the influence degree of above-mentioned decrease speed, and can be based on the lower reduction of speed after changing
Spend and suitably determine whether fuel abnormal leakage.
During the detection period, the decrease speed of fuel pressure is along with the absolute value liter of fuel pressure during the detection period
High and raise.In above-mentioned abnormity determining device, can based on described detection the period during described fuel pressure absolute value and
Change the decrease speed of fuel pressure during the described detection period.It is therefoie, for example, when fuel pressure exhausted during the detection period
To value high time, above-mentioned decrease speed is high, and therefore can reduce be judged to send out by decrease speed is changed into low speed
The probability of raw fuel abnormal leakage.So, can be according to the pass between the absolute value of fuel pressure and unchanged decrease speed
System changes decrease speed, and suitably can determine whether based on the decrease speed after changing to have occurred fuel leakage different
Often.
As it has been described above, when detecting the period in short-term, it is determined whether occur the ratio of precision of fuel abnormal leakage in the detection period
Time long low.Correspondingly, infer determine whether the precision that fuel abnormal leakage occurs along with detection time elongated segment and raise.Work as combustion
Material cutting-off controlling is performed to temporarily cease when Fuelinjection nozzle injection fuel, and Fuelinjection nozzle is not driven to be opened, and because of
This fuel pressure will not change along the driving of valve opening direction due to Fuelinjection nozzle.Therefore, even if being set in the detection period
When being set to long duration, also will not be owing to causing judging that precision reduces from Fuelinjection nozzle injection fuel.
In above-mentioned abnormity determining device, determine that such period is as the inspection this fuel cut-off controls the term of execution
Surveying the period, the starting point of this period is compression top dead center moment and the institute of ignition order cylinder before described specific cylinder
Intermediate time between the compression top dead center moment stating specific cylinder, and the terminal of this detection period is the pressure of described specific cylinder
Centre between the compression top dead center moment of contracting top dead-centre moment and ignition order cylinder after described specific cylinder
Moment.Additionally, combustion can be detected by the described pressure detecting portion arranged for described specific cylinder during this detection period
Material pressure, and can judge described fuel feed system is sent out the most by drop mode based on detected fuel pressure
Raw described fuel abnormal leakage.
According to this device, can determine that such period as the detection period fuel cut-off controls the term of execution, this time
Duan Buhui is owing to causing the reduction judging precision from Fuelinjection nozzle injection fuel and controlling not held than at fuel cut-off
Row duration.Correspondingly, can determine whether fuel abnormal leakage with high accuracy.
In above-mentioned abnormity determining device, described Fuelinjection nozzle can be equipped with pressure transducer as described pressure detecting
Portion.Each pressure transducer can detect the corresponding Fuelinjection nozzle being equipped with this pressure transducer among Fuelinjection nozzle
Spray-hole and away from the fuel pressure in the region of the spray-hole of other Fuelinjection nozzle.Accordingly, it is capable to detection along with its
The Fuelinjection nozzle that the mode that its cylinder is corresponding is arranged is dropped by the impact of the variation driving the fuel pressure beating opening/closing and cause
Low value is as the fuel pressure detected by each pressure transducer.To this end, in above-mentioned abnormity determining device, when detection
During Duan, the amplitude of fluctuation of fuel pressure is more medium and small away from the device of the fuel pressure in the region of Fuelinjection nozzle than in detection.Cause
This, can accurately determine whether fuel abnormal leakage.
One aspect of the invention is a kind of abnormality determination method for fuel feed system, wherein said fuel supplies
System have store the fuel being in pressurized state Accumulator vessel and respectively the cylinder of direct injection internal combustion engine and arrange
And it being connected respectively to the Fuelinjection nozzle of described Accumulator vessel, described abnormality determination method includes: at the midpoint from described cylinder
Intermediate time between the respective compression top dead center moment of fire order two cylinders of continuous print each other is among these cylinders
During fuel in the cylinder that ignition order is slower sprays the detection period in the moment before will starting, detection and described point
The fire the slowest cylinder of order corresponding, spraying closer to described fuel than described Accumulator vessel in described fuel feed system
The fuel pressure in region between region and the spray-hole of described Fuelinjection nozzle of valve side；And based on detected combustion
The drop mode of material pressure determines whether fuel abnormal leakage.
Accompanying drawing explanation
The feature of the exemplary embodiment of the present invention, advantage and technology and industrial significance are described below with reference to accompanying drawings,
The most similar reference represents similar key element, and wherein:
Fig. 1 is that the abnormity determining device according to an embodiment of a kind of concrete form being shown as the present invention is suitable for
The schematic diagram of overall configuration of explosive motor；
Fig. 2 is the sectional view of the cross section structure illustrating Fuelinjection nozzle；
Fig. 3 A to 3C is the time diagram of the example illustrating the relation between driving pulse and fuel pressure；
Fig. 4 A to 4C is one of the relation being shown in when pilot injection is performed between driving pulse and fuel pressure and shows
The time diagram of example；
Fig. 5 A to 5C is to be shown in fuel cut-off to control when being performed one of the relation between driving pulse and fuel pressure
The time diagram of individual example；And
Fig. 6 is the flow chart illustrating the program performing determination processing.
Detailed description of the invention
Will be discussed below a kind of concrete form as the present invention according to an embodiment for fuel feed system
Abnormity determining device.As it is shown in figure 1, intake channel 12 is connected with the cylinder 11 of explosive motor 10.Air leads to via air inlet
Road 12 is inhaled into the cylinder 11 of explosive motor 10.Incidentally, use to have and multiple (be 4 in this embodiment of the invention
[#1 to #4]) Diesel engine of cylinder 11 is as this explosive motor 10.Explosive motor 10 respectively cylinder 11 and assemble
There is the direct-injection type fuel injection valve 20 injected fuel directly in cylinder 11.By these Fuelinjection nozzles 20 along the valve side of opening
To driving and the fuel that sprays contact with the air inlet being compressed and heated in the cylinder 11 of explosive motor 10, point
Combustion, and burn.Then, in explosive motor 10, piston 13 is owing to burning produced along with fuel in each cylinder 11
Energy and be pressed down, and bent axle 14 is rotated forcibly.In the cylinder 11 of explosive motor 10, the burning gases of burning are made
The exhaust channel 15 of explosive motor 10 it is discharged to for aerofluxus.
Each Fuelinjection nozzle 20 is connected respectively to common rail 34 via tributary circuit 31a.Common rail 34 is via supply passageway 31b
It is connected to fuel tank 32.This supply passageway 31b is provided with the petrolift 33 of force feed fuel.In this embodiment of the invention,
By the fuel storage boosted by petrolift 33 force feed in common rail 34, and it is supplied in each Fuelinjection nozzle 20.
Petrolift 33 is by the camshaft actuated of explosive motor 10.Petrolift 33 is configured to whenever cam rotating 360 degrees
(when being performed in two cylinders that fuel is injected among cylinder 11) force feed fuel is once.Fuel is immediately preceding from fuel
Injection valve 20 sprays during the period after fuel completes from this petrolift 33 force feed.
Return path 35 is connected respectively to Fuelinjection nozzle 20.Each return path 35 is connected to fuel tank 32.Fuel sprays
The part penetrating the fuel within valve 20 returns fuel tank 32 via these return paths 35 respectively.Incidentally, the present invention's
In this embodiment, common rail 34 is used as Accumulator vessel, and each Fuelinjection nozzle 20, each tributary circuit 31a, supply passageway 31b
Fuel feed system is constituted with common rail 34.Additionally, in this embodiment of the invention, the start of petrolift 33 fuel caused
The amplitude of fluctuation of the fuel pressure within feed system becomes equal to ATDC90 DEG C of A in crankangle (DEG C A)
90 DEG C of A in the case of 0 DEG C of A) time become minimum.
Will be discussed below the internal structure of Fuelinjection nozzle 20.Fig. 2 illustrates the cross section structure of each Fuelinjection nozzle 20.As
Shown in Fig. 2, Fuelinjection nozzle 20 housing 21 be internally provided with needle valve 22.This needle valve 22 can be moved in a reciprocal manner
Dynamic (can move along the vertical direction in fig. 2) is configured in housing 21.Being internally provided with towards spray-hole 23 side at housing 21
() drives the spring 24 promoting above-mentioned needle valve 22 in Fig. 2 downwards consistently.Additionally, in the inside of housing 21, be positioned at side (Fig. 2
In in downside) position step up and state needle valve 22 and be formed with nozzle box 25, and be positioned at the position of opposite side (in upside in Fig. 2)
Put and be formed with pressure chamber 26.
The inside of nozzle box 25 is formed through nozzle box 25 with the spray-hole 23 of the ft connection of housing 21 through it.Fuel
It is supplied to nozzle box 25 via importing path 27 from above-mentioned tributary circuit 31a (common rail 34).Said nozzle room 25 and tributary circuit
31a (common rail 34) is connected to pressure chamber 26 via communication paths 28.Additionally, pressure chamber 26 is connected to return via drain passageway 30
Path 35 (fuel tank 32).
Use electrically driven formula Fuelinjection nozzle as above-mentioned Fuelinjection nozzle 20.Housing 21 at Fuelinjection nozzle 20
It is internally provided with the piezo-activator 29 constituted by stacking along with the piezoelectric element flexible to its input drive signal.Should
Piezo-activator 29 is equipped with valve body 29a.Valve body 29a is arranged on the inside of pressure chamber 26.Then, due to because of piezo-activator 29
Start and the movement of valve body 29a that causes, in communication paths 28 (nozzle box 25) and drain passageway 30 (return path 35)
One optionally connects with pressure chamber 26.
In this Fuelinjection nozzle 20, when valve shutdown signal inputs to piezo-activator 29, piezo-activator 29 shrinks,
Valve body 29a moves, and communication paths 28 and pressure chamber 26 are connected with each other logical.Then, that of return path 35 and pressure chamber 26
This connection is cut-off (state shown in Fig. 2).Therefore, the fuel in pressure chamber 26 is prohibited to be discharged to return path 35 (combustion
Hopper 32) state under, nozzle box 25 and pressure chamber 26 are connected with each other logical.Therefore, the pressure of nozzle box 25 and pressure chamber 26
The difference of pressure becomes fairly small, and needle valve 22 moves to block the position of spray-hole 23 by the driving rush power of spring 24.
Now, Fuelinjection nozzle 20 is not in from the state (valve closed mode) of its injection fuel.
On the other hand, when valve opening signal inputs to piezo-activator 29, piezo-activator 29 stretches, and valve body 29a moves
Move, and communication paths 28 and pressure chamber 26 are connected with each other logical.Then, return path 35 and pressure chamber 26 are connected with each other logical.Cause
This, when fuel is prohibited to flow out to pressure chamber 26 from nozzle box 25, a part for the fuel in pressure chamber 26 via
Return path 35 returns to fuel tank 32.Therefore, fuel pressure in pressure chamber 26 declines, and the pressure of pressure chamber 26 and nozzle
The difference of the pressure of room 25 becomes big.Due to this pressure differential, needle valve 22 overcomes driving rush power and moving of spring 24, and leaves spray-hole
23.Now, Fuelinjection nozzle 20 in fuel from its state sprayed (valve open mode).
Fuelinjection nozzle 20 is equipped with the letter that output is corresponding with fuel pressure PQ within above-mentioned importing path 27 integratedly
Number pressure transducer 41.Therefore, it is positioned at the fuel pressure of the position kept apart with Fuelinjection nozzle 20 with being designed to detect
The device of the fuel pressure etc. in power such as common rail 34 (seeing Fig. 1) is compared, and can detect closer to Fuelinjection nozzle
Fuel pressure in the region of the spray-hole 23 of 20.Incidentally, above-mentioned pressure transducer 41 be for each Fuelinjection nozzle 20, the most just
It is to arrange for each cylinder 11 of explosive motor 10.Therefore, respectively each cylinder 11 of explosive motor 10 and arrange
Fuel pressure PQ within Fuelinjection nozzle 20 can detect each via these pressure transducers 41.
As it is shown in figure 1, explosive motor 10 is provided with the various sensor for detecting operating condition as its periphery structure
Part.Explosive motor 10 is additionally provided with such as detecting the air inlet of the air capacity (passageway air amount GA) through intake channel 12
Quantity sensor 42 and for detecting the crank sensor 43 of rotating speed (engine speed NE) of bent axle 14 and above-mentioned pressure sensing
Device 41 is as these sensors.Additionally, explosive motor 10 is additionally provided with for detecting (such as, the acceleration of accelerator operation parts
Device pedal) the accelerator sensor 44 etc. of operational ton (accelerator operation amount ACC).
It is configured to the electronic control unit 40 equipped with such as pico computer etc. as explosive motor additionally, be additionally provided with
The surrounding member of 10.This electronic control unit 40 extracts the output signal of various sensor.According to this embodiment of the invention
Device in, the output signal of pressure transducer 41 was extracted with the extremely short cycle (such as, from several microseconds to tens microseconds)
In electronic control unit 40.Electronic control unit 40 output signal based on various sensors and perform various calculating, and press
The start performing the various controls relevant with the operating of explosive motor 10, such as Fuelinjection nozzle 20 according to result of calculation controls
The start of (fuel injection control), petrolift 33 controls (fuel pressure control) etc..
The fuel injection control of this embodiment of the present invention performs as follows.That is, it is primarily based on and includes that path is empty
The engine operating status of tolerance GA, engine speed NE, fuel pressure PQ, accelerator operation amount ACC etc. selects to spray mould
Formula, and calculate the various control desired values relevant with each injection types according to jet mode.Then, each Fuelinjection nozzle 20 is pressed
Control desired values according to these and self-driven opened by each.Therefore, fuel according to be suitable to various in the case of engine operating status
Jet mode and spray from each Fuelinjection nozzle 20 with the amount corresponding with engine operating status, and be supplied to correspondence one
In cylinder 11.Incidentally, in this embodiment of the invention, as the multiple injection mould of combination of main injection, pilot injection etc.
Formula is set in advance and is stored in electronic control unit 40.When performing fuel injection control, select in these jet modes
A kind of jet mode.Have additionally, calculate the fuel injection amount with various types of injections (such as main injection, pilot injection etc.)
The control desired value closed and and the fuel injection time point (such as the time for spraying of main injection, guide interval etc.) of various types of injection
Relevant control desired value is as described various control desired values.
Additionally, in this embodiment of the invention, explosive motor 10 is made to export (example under the situation of torque need not
As, during operating of slowing down etc.) perform to temporarily cease in order to the operating of explosive motor 10 namely makes explosive motor
10 produce torque and supply the control of fuel to explosive motor 10, and the most so-called fuel cut-off controls.This fuel
Cutting-off controlling is not operated (accelerator operation amount ACC=" 0 ") at accelerator operation parts meeting engine speed NE
It is performed during the condition etc. reduced under state.
Additionally, in this embodiment of the invention, perform fuel pressure as follows and control.That is, first, based on logical
Road air amount G A calculates control desired value (the desired fuel pressure relevant with the fuel pressure in common rail 34 with engine speed NE
Power).Then, the actuating amount (fuel force feed amount or fuel back amount) of petrolift 33 is adjusted so that actual fuel pressure becomes
Equal to target fuel pressure.Fuel pressure in common rail 34 is in other words from the fuel pressure of Fuelinjection nozzle 20 injection
It is adjusted to the pressure corresponding with engine operating status by this regulation of the actuating amount of petrolift 33.
Here it should be noted that it may happen that fuel supplies from fuel in device according to this embodiment of the invention
The internal leakage of system is to its outside exception (fuel abnormal leakage).In the case of fuel abnormal leakage, need it is adopted
Take adequate measure.
Fig. 3 A to 3C illustrates that output is to the driving pulse of each Fuelinjection nozzle 20 with by being assemblied on Fuelinjection nozzle 20
Fuel pressure PQ that detects of pressure transducer 41 between an example of relation.Drive it should be noted that Fig. 3 A represents
The output mode of moving pulse, Fig. 3 B represents how fuel pressure PQ changes in the case of not yet there is fuel abnormal leakage, and
Fig. 3 C represents how fuel pressure PQ changes in the case of there is fuel abnormal leakage.
As shown in Figure 3 A to 3C, in the case of fuel abnormal leakage, fuel pressure PQ is when Fuelinjection nozzle 20 is closed
Also decline.Therefore, when fuel abnormal leakage occurs, not yet shown in the decrease speed of fuel pressure PQ such as Fig. 3 A and 3B
Height during generation fuel abnormal leakage.Therefore, in device according to this embodiment of the invention, when the lower reduction of speed of fuel pressure PQ
When degree is higher than predetermined distinguishing speed JV, substantially it is judged to above-mentioned fuel abnormal leakage.
Meanwhile, each Fuelinjection nozzle 20 is driven intermittently during explosive motor 10 operates and opens, and fuel
From the internal spray of fuel feed system and being supplied to cylinder 11.Therefore, the fuel pressure in fuel feed system is due to combustion
This interval of material injection performs and pulses.Correspondingly, infer during explosive motor 10 operates in fuel feed system
Fuel pressure is owing to declining and because the interval of fuel injection performs to cause because spraying, from Fuelinjection nozzle 20, the pressure that fuel causes
Pulsation and change.Even if to this end, in order to determine whether to occur fuel abnormal leakage to detect the result of fuel pressure PQ
It is that the decrease speed of fuel pressure PQ is higher than in the case of distinguishing speed, it is also difficult to the decline of judgement fuel pressure PQ is can attribution
Generation in fuel abnormal leakage is still attributable to the pressure fluctuation in fuel feed system.Correspondingly, even if inferring only
Also it is difficult to determine whether accurately fuel abnormal leakage during detection fuel pressure PQ.
In consideration of it, in this embodiment of the invention, ignition order two gas of continuous print each other among cylinder 11 are determined
Intermediate time between the respective compression top dead center moment of cylinder is (special to the cylinder that ignition order among cylinder 11 is slower
Determine cylinder) in fuel injection will start before period in moment (in the example depicted in fig. 3 from time point t11 to time point
T12) it is used for determining whether to occur the detection period of fuel pressure PQ of fuel abnormal leakage as detection.Additionally,
During this detection period, (that is, it is assemblied in injection by the pressure transducer 41 to arrange by the way of corresponding with above-mentioned specific cylinder
With the pressure transducer 41 on the Fuelinjection nozzle 20 supplied the fuel in specific cylinder) detect fuel pressure PQ, and based on
The decrease speed of fuel pressure PQ determines whether fuel abnormal leakage.
Above-mentioned explosive motor 10 is equipped with 4 cylinders 11, and the ignition order of cylinder 11 is confirmed as " cylinder 11 [#
1] → cylinder 11 [#3] → cylinder 11 [#4] → cylinder 11 [#2] ".Therefore, at above-mentioned " ignition order two gas of continuous print each other
Cylinder " be confirmed as cylinder 11 [#1] and [#3] in the case of, " the respective compression of ignition order two cylinders 11 of continuous print each other
Intermediate time between top dead-centre " it is that BTDC90 DEG C of A of ATDC90 DEG C of A of cylinder 11 [#1] or cylinder 11 [#3] is (in compression
Dead point [TDC] is-90 DEG C of A in the case of being confirmed as 0 DEG C of A).Additionally, in this case, " to the gas that ignition order is slower
Fuel in cylinder 11 sprays the moment before will starting " it is the moment before the fuel injection in cylinder 11 [#3] will start
(more specifically, when driving pulse exports the Fuelinjection nozzle 20 being assemblied in cylinder 11 [#3] from electronic control unit 40
Moment).
When Fuelinjection nozzle 20 is opened (from time point t12 to time point t13 in Fig. 3), fuel pressure PQ temporarily declines.This
Outward, when Fuelinjection nozzle 20 is driven and closes, fuel pressure PQ stops declining due to the injection of this fuel.But, fuel
Pressure PQ is pulsed immediately after, and keeps changing a period of time.
Only it is primarily focused on by arranging by the way of corresponding with the cylinder (specific cylinder) in cylinder now
Fuel pressure PQ that detects of pressure transducer 41 on.In this case, immediately to specific cylinder injection and supply fuel
Fuelinjection nozzle 20 closed by driving after, fuel pressure PQ pulsation (after time point t13 and time point t13).But, fuel
This pulsation of pressure PQ reach fuel in 3 cylinders in addition to specific cylinder fuel spray after again spray
Time in moment time in specific cylinder is more specifically, when reaching BTDC90 DEG C of A of specific cylinder (at time point
T11) almost restrain.
In device according to this embodiment of the invention, from BTDC90 DEG C of A of specific cylinder in specific cylinder
Fuel injection will start before moment the detection period (from time point t11 to time point t12) period, by with specific cylinder
The pressure transducer 41 that corresponding mode is arranged is to detect fuel pressure PQ, and decrease speed based on fuel pressure PQ judges
Fuel feed system has occurred fuel abnormal leakage the most.Therefore, because spraying, from Fuelinjection nozzle 20, the combustion that fuel causes
During the period that the amplitude of fluctuation of material pressure PQ has been diminished by convergence, detect fuel pressure PQ, and judge fuel supply system
System has occurred fuel abnormal leakage the most.Accordingly, it is capable to suitably catch the fuel pressure caused because of fuel abnormal leakage
The decline of power PQ.Accordingly, it is capable to decrease speed based on fuel pressure PQ and accurately determine whether to occur abnormal leakage.
In device according to this embodiment of the invention, each pressure transducer 41 is assemblied in fuel injection the most integratedly
On valve 20.This correspondence it is equipped with near the most integratedly accordingly, it is capable to detected by a corresponding pressure transducer 41
The spray-hole 23 of each Fuelinjection nozzle 20 of one pressure transducer 41 spray-hole 23 away from other Fuelinjection nozzle 20
Fuel pressure PQ in region.Accordingly, it is capable to detection is along with the Fuelinjection nozzle 20 arranged in the way of corresponding with other cylinder 11
Detected as by each pressure transducer 41 by the value driving the impact of the variation of the fuel pressure beating opening/closing and cause to reduce
Fuel pressure PQ gone out.In consideration of it, in the embodiment in accordance with the invention, fuel pressure PQ during the above-mentioned detection period
Amplitude of fluctuation is more medium and small away from the device of the fuel pressure in the region of Fuelinjection nozzle 20 than in detection.Accordingly, it is capable to accurately sentence
Determine the most fuel abnormal leakage.
When determining whether to occur fuel abnormal leakage, first calculate per unit period combustion during the above-mentioned detection period
The slippage (decrease speed V) of material pressure PQ.More specifically, when exporting the fuel spray corresponding with specific cylinder at driving pulse
When determining the length of detection period after penetrating valve 20, determine approximately equal to each other multiple of during detection period crank angle interval
(such as, 5) test point, and read fuel pressure PQ at these test points respectively.Hereafter, utilize method of least square obtain with
The linear function of each fuel pressure PQ difference minima, and calculate and store the gradient of this linear function (more specifically, and fuel
The value that decrease speed that pressure PQ changes in response to crankangle is suitable) as decrease speed V of fuel pressure PQ.
Then, in device according to this embodiment of the invention, when this decrease speed V is higher than predetermined distinguishing speed JV
Time be judged to fuel abnormal leakage.Therefore, when the decrease speed of fuel pressure PQ is owing to fuel is from fuel supply system
The internal leakage of system and be judged to fuel abnormal leakage when uprising.Incidentally, this with about whether fuel occurs
The relevant control structure of judgement of abnormal leakage is to realize, because the output signal of each pressure transducer 41 is with extremely short
Cycle be extracted in electronic control unit 40.
Additionally, in device according to this embodiment of the invention, at decrease speed V and the distinguishing speed of fuel pressure PQ
Before the comparison carried out between JV, length based on the above-mentioned judgement period and during this judgement period (more specifically, BTDC90
DEG C A) absolute value of fuel pressure PQ changes decrease speed V.This is due to the fact that.
Fig. 4 A to 4C be shown in pilot injection the term of execution export Fuelinjection nozzle 20 driving pulse and by dress
Fit over an example of relation between fuel pressure PQ that the pressure transducer 41 on Fuelinjection nozzle 20 detects.Attached and
Ground, Fig. 4 A represents that the output mode of driving pulse, Fig. 4 B represent fuel pressure in the case of not yet there is fuel abnormal leakage
How PQ changes, and Fig. 4 C represents how fuel pressure PQ changes in the case of there is fuel abnormal leakage.
As shown in Fig. 4 A to 4C, at pilot injection (from time point t22 to time point t23, and from time point t24 to time point t25)
The detection period in the case of being performed prior to the execution of main injection (from time point t26 to time point t27) is (from time point t21 then
Point t22) than in the case of pilot injection is not performed the detection period (see in Fig. 3 from time point t11 to time point t12 time
Section) short.So, in device according to this embodiment of the invention, the length of detection period is because of the operating of explosive motor 10
State and different.
When calculating decrease speed V of fuel pressure PQ during the detection period as above, it is assumed that for this calculating
One of the detected value of fuel pressure PQ produce certain error.In this case, this error is on the impact of decrease speed V (more
Specifically, with the departure degree of appropriate value) along with the detection period shortens and increases.Correspondingly, when detecting the period in short-term, it is determined that be
The no ratio of precision that fuel abnormal leakage occurred is low during segment length when detection.
In consideration of it, in this embodiment of the invention, above-mentioned decrease speed V subtracts to shorten along with the detection period
Little mode changes.Therefore, increase, after decrease speed V changes along with the shortening of detection period and the impact on above-mentioned decrease speed V
Speed reduce, and be judged to that the probability that fuel abnormal leakage occurs reduces.Although accordingly, it is capable to suppression is not deposited
In fuel abnormal leakage but be mistaken for there is fuel abnormal leakage.So, according to this embodiment of the invention, decrease speed V is pressed
The influence degree of above-mentioned decrease speed V is changed by the length according to the detection period.Accordingly, it is capable to based on decrease speed V after changing
And suitably determine whether fuel abnormal leakage.
Additionally, when when detecting the absolute value height of fuel pressure PQ during the period, fuel pressure PQ during the detection period
Actual decrease speed higher than when the absolute value of fuel pressure PQ is low.Therefore, at as mentioned above based on multiple test points
When fuel pressure PQ calculates decrease speed V, calculate high speed as decrease speed V.When so calculating high speed
During as decrease speed V, it may be determined that for there is fuel abnormal leakage, because at device according to this embodiment of the invention
In, it is judged to when decrease speed V of fuel pressure PQ has become to be above distinguishing speed JV fuel abnormal leakage.
In consideration of it, in this embodiment of the invention, decrease speed V with along with during the detection period (more
Body ground, the starting point [BTDC90 DEG C of A] in the detection period) fuel pressure PQ raise and the mode that reduces changes.Therefore, along with upper
Stating unchanged decrease speed V to raise due to high fuel pressure PQ during the detection period, decrease speed V is changed to make
It is judged to the low velocity occurring the probability of fuel abnormal leakage to reduce.So, according to this embodiment of the invention, lower reduction of speed
Degree V according to unchanged decrease speed V and detection the period during fuel pressure PQ absolute value between relation and change.Cause
This, suitably can determine whether fuel abnormal leakage based on decrease speed V after changing.
Additionally, in this embodiment of the invention, when fuel cut-off controls to be performed, when determining detection as follows
Section.Fig. 5 A to 5C exports the term of execution of being shown in that fuel cut-off controls to by fuel injection be supplied to the fuel of specific cylinder
The driving pulse of injection valve 20 and fuel pressure PQ detected by the pressure transducer 41 being assemblied on Fuelinjection nozzle 20
Between an example of relation.Incidentally, Fig. 5 A represents that the output mode of driving pulse, Fig. 5 B represent fuel is not yet occurring
In the case of abnormal leakage, how fuel pressure PQ changes, and Fig. 5 C represents fuel in the case of there is fuel abnormal leakage
How pressure PQ changes.
As shown in Fig. 5 A to 5C, when fuel cut-off control be performed time, determine such period as the above-mentioned detection period,
The starting point of described period is the compression top dead center moment of ignition order cylinder before specific cylinder and specific cylinder
Intermediate time (BTDC90 DEG C of A) between the compression top dead center moment, and the terminal of described period is dead in the compression of specific cylinder
Intermediate time (ATDC90 between some moment and the compression top dead center moment of ignition order cylinder after specific cylinder
℃A).Incidentally, if it is assumed that " ignition order cylinder before specific cylinder " is cylinder 11 [#1], " specific cylinder "
Be cylinder 11 [#3], and " ignition order cylinder after specific cylinder " is cylinder 11 [#4], then " ignition order is tight
During middle between compression top dead center moment and the compression top dead center moment of specific cylinder of the cylinder before being connected on specific cylinder
Carve " it is BTDC90 DEG C of A of cylinder 11 [#3].Additionally, in this case, above-mentioned " the compression top dead center moment of specific cylinder and point
Intermediate time between the compression top dead center moment of fire order cylinder after specific cylinder " it is cylinder 11 [#3]
ATDC90 DEG C of A, and to detect the period be the period from BTDC90 DEG C of A of cylinder 11 [#3] to ATDC90 DEG C of A of cylinder 11 [#3].
When the period detected as described above in short-term, it is determined whether there is the ratio of precision of the fuel abnormal leakage segment length when detection
Time low.Therefore, it is determined whether occurred fuel abnormal leakage precision can along with detection time elongated segment and raise.Work as fuel cut-off
When controlling to be performed, Fuelinjection nozzle 20 is not driven to be opened, and therefore fuel pressure PQ will not be due to Fuelinjection nozzle 20 edge
The driving of valve opening direction and change.Therefore, even if when the detection period is set to long duration, being also not result in because of from fuel
Injection valve 20 sprays the reduction of the judgement precision that fuel causes.
In consideration of it, in device according to this embodiment of the invention, from BTDC90 DEG C of A of specific cylinder to spy
The period of the ATDC90 DEG C of A determining cylinder is set to the detection period this fuel cut-off controls the term of execution.Then, based on
The fuel pressure detected by the pressure transducer 41 to arrange by the way of corresponding with specific cylinder during this detection period
Decrease speed V of PQ, judges the most to have occurred in fuel feed system fuel abnormal leakage.Accordingly, it is capable to determine and will not cause
Reduce because spraying, from each Fuelinjection nozzle 20, the judgement precision that fuel causes and control not to be performed duration than at fuel cut-off
Period as the detection period fuel cut-off controls the term of execution.Correspondingly, can determine whether to fire with high accuracy
Material abnormal leakage.
Describe in detail below in reference to the flow chart shown in Fig. 6 and determine whether to occur the determination processing of fuel abnormal leakage
Execution program (acting on).Incidentally, a series of places reason electronic control unit 40 shown in this flow chart is such as with pre-timing
Between interlude interrupt periodically perform.This determination processing utilizes the pressure sensing arranged in the way of corresponding with cylinder 11
Each cylinder 11 is performed by a pressure transducer corresponding in device 41.
As shown in Figure 6, in this place in reason, first judge in pressure transducer 41 whether no exceptions (step S101).
Then, if pressure transducer 41 has occurred exception (step S101: no), then temporarily terminate currently processed and do not perform follow-up
Process.On the other hand, if pressure transducer 41 normal (step S101: yes), then determine whether just performing fuel cut-off control
(step S102).
Then, if fuel cut-off is the most just performed (step S102: no), then determine whether to meet [bar described below
Part A] (step S103).
[condition A] has sprayed from the fuel of Fuelinjection nozzle 20.
If be unsatisfactory for this [condition A] (step S103: no), then temporarily terminate currently processed and do not perform subsequent treatment.
If repeating thereafter through currently processed and meet [condition A] (step S103: yes), it assumes that due to from fuel
Injection valve 20 sprays fuel to be completed and determines the detection period and not yet based on the fuel pressure detected during the detection period
Power PQ calculates decrease speed V of fuel pressure PQ and calculates decrease speed V (step S104).
On the other hand, when fuel cut-off controls just to be performed (step S102: yes), then determine whether to meet described below
[condition B] (step S105).
[condition B] crankangle is more than ATDC90 DEG C of A.
If be unsatisfactory for this [condition B] (step S105: no), then temporarily terminate currently processed and do not perform subsequent treatment.
If repeating thereafter through currently processed and meet [condition B] (step S105: yes), it assumes that due to crankangle
Determine the detection period more than ATDC90 DEG C of A and not yet calculate combustion based on fuel pressure PQ detected during the detection period
Expect that decrease speed V of pressure PQ calculates decrease speed V (step S106).
Then, after so calculating decrease speed V of fuel pressure PQ (step S104 or step S106), based on sentencing
The regularly length of section and judging that the absolute value of (more specifically, BTDC90 DEG C of A) fuel pressure PQ changes decline during the period
Speed V (step S107).In device according to this embodiment of the invention, obtaining in advance can be based on various experiments and simulation
Result and accurately determine whether the relation that fuel abnormal leakage occurs as unchanged decrease speed V, judge the period
Relation between length, decrease speed V after judging the absolute value of fuel pressure PQ during the period and changing, and it is stored in electricity
In sub-control unit 40.In the process of step S107, calculate decrease speed V after change based on this relation.More specifically,
Decrease speed V after changing is calculated as along with the detection period shortens and along with fuel pressure PQ absolute during the detection period
The speed that value raises and reduces.
Hereafter, it is determined that whether decrease speed V after so changing is higher than distinguishing speed JV (step S108).Incidentally, exist
In device according to this embodiment of the invention, obtain in advance and can suitably judge combustion based on various experiments and the result of simulation
Material feed system occurs the particular value of fuel abnormal leakage as above-mentioned distinguishing speed JV the most, and is stored in Electronic Control
In unit 40.
Then, if decrease speed V of fuel pressure PQ is higher than distinguishing speed JV (step S108: yes), then it has been judged to
There is fuel abnormal leakage (step S109).Incidentally, in this case, by the generation historical storage of fuel abnormal leakage at electricity
In sub-control unit 40, and light emergency warning lamp (not shown).On the other hand, if decrease speed V of fuel pressure PQ equal to or
Less than distinguishing speed JV (step S108: no), then it is judged to not yet fuel abnormal leakage (step S110).So judging
After the most there is fuel abnormal leakage, currently processed temporary transient termination.
As it has been described above, according to this embodiment of the invention, it is thus achieved that following effect.(1) each Fuelinjection nozzle 20 fills respectively
It is furnished with the corresponding pressure transducer 41 for detecting fuel pressure PQ.Additionally, determine from ignition order continuous print each other
Intermediate time between the respective compression top dead center moment of two cylinders 11 is to the combustion in the cylinder 11 slower to ignition order
Expect that the period spraying the moment before will starting, as the detection period, is detected during the described detection period and is used for determining whether
There is fuel pressure PQ of fuel abnormal leakage.Additionally, pass through based on during the detection period with corresponding with above-mentioned specific cylinder
Decrease speed V of fuel pressure PQ that detects of the pressure transducer 41 that arranges of mode determine whether to occur fuel to leak
Abnormal.Therefore, little value is being converged to because spraying the amplitude of fluctuation of fuel pressure PQ that fuel causes from Fuelinjection nozzle 20
Detect fuel pressure PQ during period, and judge fuel feed system has occurred the most fuel abnormal leakage.Accordingly, it is capable to suitably
The decline of fuel pressure PQ that ground seizure causes because of fuel abnormal leakage.Accordingly, it is capable to decline based on fuel pressure PQ
Speed and accurately determine whether to occur abnormal leakage.
(2) decrease speed V of fuel pressure PQ during the detection period is calculated, and in decrease speed V higher than predetermined sentencing
It is judged to during other speed JV fuel abnormal leakage.Therefore, if decrease speed V of fuel pressure PQ is owing to fuel is from fuel
Leakage in feed system and high, then be judged to fuel abnormal leakage.
(3) before the comparison carried out between decrease speed V and distinguishing speed JV of fuel pressure PQ, based on judging the period
Length change decrease speed V.Accordingly, it is capable to the influence degree of above-mentioned decrease speed V is changed according to the length of detection period
Become decrease speed V, and suitably can determine whether fuel abnormal leakage based on decrease speed V after changing.
(4) before the comparison carried out between decrease speed V and distinguishing speed JV of fuel pressure PQ, based on fuel pressure
The absolute value of PQ changes decrease speed V.Accordingly, it is capable to according to the absolute value of fuel pressure PQ during the detection period with do not change
Decrease speed V between relation change decrease speed V, and suitably can judge based on decrease speed V after changing
The most there is fuel abnormal leakage.
(5) period from BTDC90 DEG C of A of specific cylinder to ATDC90 DEG C of A of specific cylinder is set at fuel cut-off
The detection period term of execution of control, and based on during the detection period by the pressure to arrange by the way of corresponding with specific cylinder
Decrease speed V of fuel pressure PQ that force transducer 41 detects has occurred fuel to leak judging the most in fuel feed system
Abnormal.Accordingly, it is capable to determine and will not cause because spraying, from each Fuelinjection nozzle valve 20, the reduction of judgement precision and the ratio that fuel causes
Control not to be performed the period of duration as the detection period fuel cut-off controls the term of execution at fuel cut-off.Correspondingly,
Can determine whether fuel abnormal leakage with high accuracy.
(6) each pressure transducer 41 is assemblied on a Fuelinjection nozzle 20 of correspondence integratedly.Accordingly, it is capable to detection along with
The Fuelinjection nozzle 20 arranged in the way of corresponding with other cylinder 11 is driven the fuel pressure beating opening/closing and cause to change
Impact reduce value as fuel pressure PQ detected by each pressure transducer 41.Correspondingly, in the above-mentioned detection period
The amplitude of fluctuation of period fuel pressure PQ is more medium and small away from the device of the fuel pressure in the region of Fuelinjection nozzle 20 than in detection.
Accordingly, it is capable to accurately determine whether fuel abnormal leakage.
Incidentally, the above embodiment of the present invention can perform after amendment as follows.Can use in the detection period
Period fuel pressure PQ at any crankangle (such as, one of the plurality of test point) place or during the detection period fuel pressure
The meansigma methods of power PQ rather than fuel pressure PQ at starting point (the BTDC90 DEG C of A) place of use detection period are as in detection phase period
Between the absolute value of fuel pressure PQ.
As length based on the detection period and during the detection period absolute value of fuel pressure PQ change fuel pressure
Decrease speed V of power PQ alternately or additionally, can change distinguishing speed JV.In this case, it determines speed JV can be changed to
High speed, so that being judged to that the probability that fuel abnormal leakage occurs is such as along with the shortening of detection period or along with in inspection
During surveying the period, the absolute value of fuel pressure PQ raises and reduces.
The process of step S107 in Fig. 6 can be arbitrarily modified or omit.If more specifically, the length of detection period
Affect little, then can omit length based on the detection period and change decrease speed V or the process of distinguishing speed JV.If additionally,
During the detection period, the impact of the absolute value of fuel pressure PQ is little, then can omit and change decrease speed V based on this absolute value
Or the process of distinguishing speed JV.
The most suitably read two fuel pressures PQ in judging fuel pressure PQ detected during the period, calculate
By the gradient of line connected to each other for these fuel pressures PQ, and use obtained gradient as the lower reduction of speed of fuel pressure PQ
Degree.Incidentally, as said two fuel pressure PQ, such as, BTDC90 DEG C of A can be used when fuel cut-off controls and is not performed
Fuel pressure PQ at place and fuel pressure PQ during driving pulse exports, and can use when fuel cut-off controls and is performed
Fuel pressure PQ at BTDC90 DEG C of A and fuel pressure PQ at ATDC90 DEG C of A.Fire during the detection period additionally, can calculate
The slippage of material pressure PQ rather than decrease speed V of calculating fuel pressure PQ detected by during the detection period.This
In the case of, if the slippage of fuel pressure PQ is more than predetermined differentiation amount during the detection period, then can determine that and supply into fuel
To system has occurred fuel abnormal leakage.In short, can determine that under fuel pressure PQ detected during the detection period
The desired value of fall pattern and the discriminant value compared with this desired value so that accurately can judge based on drop mode be
No there is fuel abnormal leakage.
In the above embodiment of the present invention, A and ATDC90 DEG C of A of BTDC90 DEG C of one of cylinder 11 is set to " igniting
Intermediate point between the compression top dead center of order two cylinders 11 of continuous print the most each other ", " ignition order is before specific cylinder
Cylinder compression top dead center and the compression top dead center of specific cylinder between intermediate point " or " compression top dead center of specific cylinder
And the intermediate point between the compression top dead center of the cylinder that ignition order is after specific cylinder ".The present invention is not limited to this
Configuration.The most suitably set and these values i.e. BTDC90 DEG C of crank slightly different for A and ATDC90 DEG C of A
Angle.
When the moment of driving pulse output the most definitely requires to be set to the detection when fuel cut-off controls not to be performed
The terminal of section.The most suitably set the moment being somewhat prior to or subsequent to this moment.If in short, sprayed from Fuelinjection nozzle 20
Penetrate the moment before fuel will start in other words, open along with Fuelinjection nozzle 20 and the decline of fuel pressure PQ that causes
Moment before will starting can be set to above-mentioned terminal, and problem also will not occur.
The most suitably suppress to determine whether fuel abnormal leakage when fuel cut-off controls and is performed.Although
Each cylinder 11 is performed determination processing (Fig. 6) by the above embodiment of the present invention respectively, but the most only to predetermined one
Individual cylinder 11 performs determination processing.
The rigging position of pressure transducer 41 can at random change into such as tributary circuit 31a etc., as long as can detect than altogether
Rail 34 is closer to the fuel pressure in the region between the region and the spray-hole 23 of Fuelinjection nozzle 20 of Fuelinjection nozzle 20 side
?.
Replace the Fuelinjection nozzle being designed to be driven by piezo-activator, such as, also can use and be designed to by being equipped with
There is the Fuelinjection nozzle etc. that the electromagnetic actuators of solenoid drives.
The present invention is applicable to have the explosive motor of two cylinders, have the explosive motor of three cylinders or have five
The individual explosive motor with upper cylinder, and there is the explosive motor of four cylinders.
The present invention is suitable for use with the petrol engine of Fuel Petroleum and uses the natural gas engine of gas fuel, with
And Diesel engine.
Claims (7)
1., for an abnormity determining device for fuel feed system, wherein said fuel feed system has storage and is in pressurization
The cylinder (11) of the Accumulator vessel (34) of the fuel of state and respectively direct injection internal combustion engine and arrange and be connected respectively to
The Fuelinjection nozzle (20) of described Accumulator vessel (34),
Described abnormity determining device is characterised by including pressure detecting portion (41), and described pressure detecting portion is respectively described cylinder
(11) arrange and detect in described fuel feed system than described Accumulator vessel closer to described Fuelinjection nozzle side
The fuel pressure in region between the spray-hole of region and described Fuelinjection nozzle, wherein
Described abnormity determining device is in the respective pressure of two cylinders of continuous print each other of ignition order among described cylinder (11)
Intermediate time between the contracting top dead-centre moment is to ignition order among these two cylinders (11) of ignition order continuous print each other relatively
By slower for described ignition order during the detection period that the slow fuel in a cylinder sprays the moment before will starting
Cylinder (11) and the described pressure detecting portion (41) that arranges detects fuel pressure, and
Described abnormity determining device drop mode based on detected fuel pressure determines whether to have occurred fuel to leak
Abnormal.
Abnormity determining device the most according to claim 1, wherein
Described abnormity determining device calculates during the described detection period decrease speed of described fuel pressure as described decline
Pattern, and be judged to described fuel abnormal leakage when described decrease speed is higher than predetermined distinguishing speed.
Abnormity determining device the most according to claim 2, wherein
Described abnormity determining device changes described decrease speed based on the described length detecting the period.
4. according to the abnormity determining device described in Claims 2 or 3, wherein
Described abnormity determining device changes described decline based on the absolute value of described fuel pressure during the described detection period
Speed.
Abnormity determining device the most according to any one of claim 1 to 3, wherein
Described abnormity determining device controls to be performed to temporarily cease from described Fuelinjection nozzle (20) injection combustion at fuel cut-off
Setting the detection period during material, the starting point of described detection period is that among described cylinder (11) of ignition order is specific
In between compression top dead center moment and the compression top dead center moment of described specific cylinder (11) of the cylinder (11) before cylinder
Between the moment, and the terminal of described detection period be compression top dead center moment of described specific cylinder (11) and ignition order immediately
Intermediate time between the compression top dead center moment of the cylinder (11) after described specific cylinder (11),
Described abnormity determining device described detection the period during by the described pressure arranged for described specific cylinder (11)
Test section (41) detects fuel pressure, and
Described abnormity determining device drop mode based on detected fuel pressure determines whether described fuel
Abnormal leakage.
Abnormity determining device the most according to any one of claim 1 to 3, wherein, described pressure detecting portion (41) is dress
Fit over the pressure transducer on described Fuelinjection nozzle (20).
7., for an abnormality determination method for fuel feed system, wherein said fuel feed system has storage and is in pressurization
The cylinder (11) of the Accumulator vessel (34) of the fuel of state and respectively direct injection internal combustion engine and arrange and be connected respectively to
The Fuelinjection nozzle (20) of described Accumulator vessel (34), described abnormality determination method is characterised by including:
Between the respective compression top dead center moment of two cylinders of continuous print each other of ignition order among described cylinder (11)
Intermediate time in the slower cylinder of ignition order among these two cylinders (11) of ignition order continuous print each other
During fuel sprays the detection period in the moment before will starting, detect the cylinder (11) slower with described ignition order corresponding
, in described fuel feed system than described Accumulator vessel (34) closer to described Fuelinjection nozzle (20) side region and
The fuel pressure in region between the spray-hole of described Fuelinjection nozzle (20)；And
Drop mode based on detected fuel pressure determines whether fuel abnormal leakage.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012005349A JP5718829B2 (en) | 2012-01-13 | 2012-01-13 | Abnormality judgment device for fuel supply system |
| JP2012-005349 | 2012-01-13 | ||
| PCT/IB2013/000073 WO2013104986A1 (en) | 2012-01-13 | 2013-01-09 | Abnormality determination apparatus and abnormality determination method for fuel supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104105862A CN104105862A (en) | 2014-10-15 |
| CN104105862B true CN104105862B (en) | 2016-11-30 |
Family
ID=
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1225708A (en) * | 1996-05-20 | 1999-08-11 | 美国西门子汽车公司 | Fuel leakage detector system |
| CN1714234A (en) * | 2002-11-20 | 2005-12-28 | 三菱重工业株式会社 | Leak fuel collection apparatus of internal combustion engine |
| CN101061303A (en) * | 2004-11-18 | 2007-10-24 | 罗伯特·博世有限公司 | Method and device for leak proofing a fuel injecting valve for an internal combustion engine |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1225708A (en) * | 1996-05-20 | 1999-08-11 | 美国西门子汽车公司 | Fuel leakage detector system |
| CN1714234A (en) * | 2002-11-20 | 2005-12-28 | 三菱重工业株式会社 | Leak fuel collection apparatus of internal combustion engine |
| CN101061303A (en) * | 2004-11-18 | 2007-10-24 | 罗伯特·博世有限公司 | Method and device for leak proofing a fuel injecting valve for an internal combustion engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100373037C (en) | Common rail fuel injection system | |
| EP2031230B1 (en) | Fuel injection characteristic sensing device and fuel injection command correcting device | |
| CN101377161B (en) | Fuel injection control device | |
| CN101377180B (en) | Fuel injection controller for internal combustion engine | |
| CN101372920B (en) | Fuel injection control device | |
| EP2031225B1 (en) | Fuel injection device and fuel injection system | |
| EP2031227B1 (en) | Fuel injection device and method for examining the same | |
| EP2031226B1 (en) | Fuel injection device, fuel injection system, and method for determining malfunction of the same | |
| CN101397943B (en) | Fuel-supply quantity estimating apparatus and fuel injection system | |
| CN103249936B (en) | Fuel facility for internal combustion engine | |
| CN101802361B (en) | Vehicle control device | |
| CN103459827B (en) | For detecting method and the spraying system of the nozzle box's pressure in ejector | |
| CN101743393B (en) | Engine | |
| CN1327122C (en) | Common rail type fuel injection system | |
| CN101846005A (en) | Fuel injection detecting device | |
| CN102644519B (en) | Fuel injection system for internal combustion engine | |
| CN101846004A (en) | Fuel injection detecting device | |
| CN107013353A (en) | The control system of internal combustion engine | |
| US6196184B1 (en) | Method and device for detecting a preinjection in an internal combustion engine | |
| JP5370348B2 (en) | Fuel injection control device for internal combustion engine | |
| JP2014098341A (en) | Fuel injection characteristic learning device for internal combustion engine | |
| JP2012229623A (en) | High-pressure fuel feeding device of internal combustion engine | |
| JP6215718B2 (en) | Fuel injection characteristic detection device | |
| CN104105862B (en) | Abnormity determining device and abnormality determination method for fuel feed system | |
| JP6087726B2 (en) | Fuel injection characteristic detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 |