CN103511106B - Optimize the fuel injection control system of multi-injection - Google Patents
Optimize the fuel injection control system of multi-injection Download PDFInfo
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- CN103511106B CN103511106B CN201310296382.2A CN201310296382A CN103511106B CN 103511106 B CN103511106 B CN 103511106B CN 201310296382 A CN201310296382 A CN 201310296382A CN 103511106 B CN103511106 B CN 103511106B
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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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2464—Characteristics of actuators
- F02D41/2467—Characteristics of actuators for injectors
-
- 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
- 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
-
- 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
- F02D2200/0604—Estimation of fuel pressure
-
- 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
-
- 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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- 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)
- Combined Controls Of Internal Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A kind of device of the multi-injection for controlling internal combustion engine, including：Acquiring unit, it obtains the multi-injection waveform representing fuel pressure change：The memory element of storage model curve, is determined this model curve when previously spraying during multi-injection and do not carry out object injection；Extraction unit, the pressure waveform of its extracting object injection is as object waveform；First computing unit, it is calculated with reference to pawl power based on the fuel pressure when being sprayed in object waveform：And second computing unit, its first parameter based on the second parameter with object waveform calculates the maximum injection rate of object injection, this first parameter represents the degree that fuel pressure declines from reference pressure in response to the object injection just carrying out, and this second parameter reflects the fuel pressure of the model curve when just carrying out object injection.
Description
Technical field
Present disclosure is related to a kind of fuel injection control system for being arranged on the internal combustion engine on vehicle.
Background technology
Fuel injection control system controls the fuel injection to internal combustion engine via Fuelinjection nozzle.Specifically, fuel spray
Penetrate the change based on the fuel pressure occurring in response to the fuel injection from Fuelinjection nozzle for the control device, determine controlled
The spray regime of injection events (that is, object injection) and control Fuelinjection nozzle.
In order to output torque and the emission state of precise control internal combustion engine is it is important to accurately control fuel injection thing
The spray regime of part, the emitted dose of the fuel for example spraying from Fuelinjection nozzle, injection time started etc..With regard to this control behaviour
Make, JP-A-2010-3004 discloses following control operation.
In control operation, fuel pressure sensor detection occurs in response to the injection events in fuel feed lines
Fuel pressure change, this fuel feed lines extends to the nozzle of Fuelinjection nozzle.As a result, actual ejection event is detected
Spraying rate waveform (spray regime).Set the injection command signal of post-injection event based on spraying rate waveform.Spurting
State is thus be accurately controlled desired state.
When carrying out multi-injection (wherein carrying out multiple fuel injection event in often single burn cycle) it is necessary to consider with
Lower content.In other words, (multi-injection detects ripple to the pressure waveform being detected by fuel pressure sensor during multi-injection
Shape) in, because produced by the injection events before spraying in object, residual waveform component is overlapping with pressure waveform.
Therefore, in JP-A-2010-3004, prestore model curve as mathematical formulae, this model curve illustrates
Pressure waveform when previously injection events are performed as individual event.Deduct this from the waveform of above-mentioned multi-injection detection
Model curve.Therefore, the pressure waveform (object waveform) owing to object injection can be extracted.It is subsequently based on extracted object
Waveform come to detect reality spray regime.
However, by the various experiments related to the foregoing teachings implemented by the present inventor, inventor finds
Deviation occurs between the maximum injection rate based on object waveshape and actual maximum injection rate.In other words, because object
Waveform is understood reference model curve to represent relative pressure change, it is thus eliminated that the model curve pair being separated with object waveform
The impact of maximum injection rate.
Content of the invention
The embodiment of present disclosure provides a kind of fuel injection control system, and it can with high accuracy calculate object
The maximum injection rate of injection, the injection of this object is thousand meaning one second and subsequent injection events during multi-injection.
Present disclosure is a kind of device for controlling fuel injection being applied to fuel injection system, described fuel spray
The system of penetrating includes Fuelinjection nozzle and fuel pressure sensor, and institute's spouse's Fuelinjection nozzle will fire from the injection of, nozzle internal combustion engine
The fuel burning, fuel pressure in the fuel feed lines extending to described nozzle for the described fuel pressure sensor detection.Institute
State device and can control fuel injection to carry out multi-injection, wherein, fuel is during the single burn cycle of described internal combustion engine
Injected multiple, described multi-injection includes in check object injection and the previous injection before the injection of described object.
Described device includes：Acquisition module, it is used for obtaining multi-injection waveform, and described multi-injection waveform is to represent to work as
Just carrying out the pressure waveform of the change of fuel pawl power being detected during described multi-injection by described fuel pressure sensor；Storage mould
Block, it is used for storage model curve (Wm), and described model curve is used as to carry out described previous injection during described multi-injection
And do not carry out the model of described pressure waveform determined by during described object injection；Extraction module, it is used for from described multiple spray
Deduct described model curve in ejected wave shape and extract that the pressure waveform that leads to is used as object waveform due to the injection of described object
(Wt)；First computing module, it is used for based on the combustion when not carrying out the injection by Fuelinjection nozzle in described object waveform
Expect pressure to calculate reference pressure (Pbase)；And second computing module, it is used for based on the second parameter (Δ Pdif) with institute
State the first parameter in object waveform (Δ P γ and Δ P) to calculate the maximum injection rate (Rmax) of described object injection, described the
One parameter represents the degree that fuel pressure reduces from described reference pressure in response to the described object injection just carrying out, described the
Two parameters are reflected in the fuel pressure of described model curve when just carrying out described object injection.
According to above-mentioned configuration, when carrying out fuel injection by Fuelinjection nozzle, fuel pressure sensor detection is extending to
Fuel pressure in the fuel feed lines of nozzle.When carrying out multi-injection, obtain expression and detected by fuel pressure sensor
Fuel pressure change pressure waveform, be used as multi-injection detection waveform.
Memory module storage model curve, this model curve is used as any one second during multi-injection and subsequent
In the case that injection events are for object injection, when carrying out the injection events before object Suo penetrates without carrying out object injection
Pressure waveform model.This model curve subsequently deducts from the waveform of multi-injection detection.Therefore, because object injection and
The pressure waveform leading to is extracted as object waveform.Additionally, not carrying out by fuel injection based in object waveform
The fuel pressure during injection of valve is calculating reference pressure.
Calculate the maximum injection rate of object injection based on the first parameter and the second parameter, described first parameter represents in institute
State the degree that the fuel pressure in object waveform reduces from reference pressure, described second ginseng in response to the object injection just carrying out
Number is reflected in the fuel pressure of described model curve when just carrying out described object injection.This first, the first parameter is sprayed with object
Maximum injection rate be strongly related.Additionally, the second parameter reflects the model curve being separated with object waveform to maximum
The impact of spraying rate difference therefore, in addition to fourth first parameter strongly related to the maximum injection rate that object sprays, is also based on anti-
The second parameter having reflected the impact to maximum injection rate for the model curve to calculate maximum injection rate.Therefore. when based on object waveform
Come to calculate object injection maximum injection rate when, can with high accuracy calculate maximum injection rate.
Additionally, present disclosure is a kind of device for controlling fuel injection being applied to fuel injection system, described
Fuel injection system includes Fuelinjection nozzle and fuel pressure sensor, and described Fuelinjection nozzle will be in internal combustion engine from nozzle injection
The fuel of middle burning, fuel pressure in the fuel feed lines extending to described nozzle for the fuel pressure sensor detection.Institute
State device and can control fuel injection to carry out multi-injection, wherein, fuel is during the single burn cycle of described internal combustion engine
Injected multiple, described multi-injection includes in check object injection and the previous injection before the injection of described object.
Described device includes：Acquisition module, it is used for obtaining multi-injection waveform, and described multi-injection waveform is to represent
Just carrying out the pressure waveform of the change of fuel pressure being detected during described multi-injection by described fuel pressure sensor；Storage mould
Block, it is used for storage model curve (Wm), and described model curve is used as to carry out described previous injection during described multi-injection
And do not carry out the model of described pressure waveform determined by during described object injection；Extraction module, it is used for from described multiple spray
Deduct described model curve in ejected wave shape and extract that the pressure waveform that leads to is used as object waveform due to the injection of described object
(Wt)；Computing module, it is used for calculating described object injection based on the first parameter (Pi and Pc) and the second parameter (Δ Pdif)
Maximum injection rate, described first parameter be in described multi-injection waveform when not carrying out the injection of described Fuelinjection nozzle
Fuel pressure, described second parameter is reflected in the fuel pressure of described model curve when just carrying out the injection of described object.
According to above-mentioned configuration, calculate the maximum injection rate of object injection based on the first parameter and the second parameter, this first
Parameter is the fuel pressure in the waveform of multi-injection detection when not carrying out the injection of described Fuelinjection nozzle, described second
Parameter reflects the fuel pressure of the described model curve when carrying out described object injection.Here, the first parameter and object spray
The maximum injection rate penetrated is strongly related.Additionally, the second parameter reflects the model curve being separated with object waveform to
The impact of big spraying rate.Therefore, in addition to first parameter strongly related to the maximum injection rate that object sprays, also it is based on anti-
The second parameter reflecting the impact to maximum injection rate for the model curve to calculate maximum injection rate.Therefore, can with high accuracy calculate
The maximum injection rate of object injection.
Brief description
In the accompanying drawings：
Fig. 1 is total schematic diagram of the fuel injection system of application fuel injection control system；
Fig. 2A, 2B and 2C are the sequential chart showing the little spraying rate corresponding with injection command signal and fuel pressure change；
Fig. 3 is to illustrate that the function in the middle of the function of being provided by the ECU of Fig. 1 (is for example, that Fuelinjection nozzle sets injection
Command signal) block diagram；
Fig. 4 is the flow chart processing operation for calculating spraying rate parameter；
When Fig. 5 A, 5B and 5C are to illustrate injected fuel pressure waveform, non-ejection fuel pressure waveform and injection waveform
Sequence figure；
Fig. 6 is the relation being shown in from the injection interval that previous injection events to object spray and actual ejection amount
View；
Fig. 7 A, 7B and 7C are the sequential charts illustrating actual ejection rate, the waveform of multi-injection detection and object waveform；
Fig. 8 A, 8B and 8C are to illustrate to spray command signal, the waveform of multi-injection detection, and the sequential of object waveform
Figure；And
Fig. 9 A, 9B and 9C are the sequential chart of the modified example illustrating modal pressure difference.
Specific embodiment
The embodiment of specified fuel injection control system to be described below in reference to accompanying drawing.Fuel spray according to the present embodiment
Penetrate control device to be installed in the electromotor (internal combustion engine) of vehicle.It is assumed that electromotor is that fuel under high pressure is ejected into multiple vapour
Come the Diesel engine of burning fuel in cylinder #1 to #4 and by compression ignition.
Fig. 1 is to illustrate that Fuelinjection nozzle 10, fuel pressure sensor carry the schematic diagram of 20, electronic control unit (ECU) 30 etc..
Fuelinjection nozzle 10 is arranged in each cylinder #1 to #4 of electromotor.Fuel pressure sensor 20 is arranged on each fuel injection
In valve 10.ECU30 is arranged in vehicle.
First, description is included the fuel injection system of the electromotor of Fuelinjection nozzle 10.Fuel in fuel tank 40 leads to
Cross petrolift 41 to be pumped into common rail 42 (accumulator) and accumulated.Fuel is subsequently divided and is fed to the fuel of each cylinder
Injection valve 10 (#1 to #4).Multiple Fuelinjection nozzles 10 (#1 to #4) carry out fuel injection in succession with order set in advance.
Plunger displacement pump is used as petrolift 41.Therefore, the reciprocating motion of fuel and plunger is synchronously pumped, with electromotor output
As driving source, petrolift 41 is driven by bent axle.Therefore, during single burn cycle, fuel is pumped from petrolift 41
The number of times setting.
Fuelinjection nozzle 10 is configured to including main body 11 as mentioned below, aciculiform valve member 12, actuator 13 etc..High
Pressure path 11a is formed in main body 11.The nozzle 11b of spray fuel is also formed in main body 11.Valve member l2 is contained in main body
In 11, and open and close nozzle 11b.
The back pressure chamber 11c that back pressure is applied to valve member 12 is formed in main body 11.By high-voltage path 11a and low pressure path
11d is connected to back pressure chamber 11c.Connected state between high-voltage path 11, low pressure path 11d and back pressure chamber 11c is by control valve 14
To switch.When the actuator 13 of such as solenoid or piezoelectric element be energized and control valve 14 operated (for example, in Fig. 1 to
Lower pressing) when, back pressure chamber 11 is connected with low pressure path 11d.Fuel pressure in back pressure chamber 11c is thus reduce.It therefore reduces
It is applied to the back pressure of valve member 12, and valve member 12 is lifted up (operation opened by valve).The plate shape surface 12a of valve member 12 with
Move away from the plate shape surface 11e of main body 11 afterwards, and from nozzle 11b spray fuel.
On the other hand, when turning off the energising to actuator 13 and by operating in control valve 14 upward direction in FIG,
Back pressure chamber 11c is connected with high-voltage path 11a.Fuel pressure in back pressure chamber 11c is thus increase.Therefore, it is applied to valve member 12
Back pressure increase, and valve member 12 is fallen (valve shutoff operation).The plate shape surface 12a of valve member 12 is subsequent and main body 11
Plate shape surface 11e contacts, and stops the fuel from nozzle 11b injection.
Therefore, the operation that opens and closes of valve member 12 to be controlled by the ECU30 of the energising controlling actuator 13.Therefore,
According to the opening and closing operation of valve member 12, the fuel under high pressure being fed to high-voltage path 11a from common rail 42 is sprayed from nozzle 11b
Project.
Fuel pressure sensor 20 is arranged in each Fuelinjection nozzle 10.Fuel pressure sensor 20 be configured to including
Shank 21 (elastomer) as mentioned below, pressure sensor component 22 etc..Shank 21 is attached to main body 11.It is formed at shank
Diaphragm portion 21a in 21 is by being resiliently deformed by receiving the pressure being derived from the fuel under high pressure flowing through high-voltage path 11a.Pressure passes
Sensor component 22 is attached to diaphragm portion 21a, and based on the elastic deformation amount occurring in diaphragm portion 21a by pressure detecting signal
Export ECU30.
Amount that ECU30 is operated based on gas pedal, engine load, engine speed NE etc. are calculating target spurting
State (for example, the quantity of injection, injection start time, injection finish time and emitted dose).For example, will bear corresponding to electromotor
The optimal spray regime of lotus and engine speed is stored as spray regime figure.Turned based on current engine load and electromotor
Speed, ECU30 to calculate target spray regime with reference to spray regime figure.Subsequently, ECU30 sets and is described in detail below based on spray
Penetrate corresponding injection command signal t1, t2 of the target spray regime that rate parameter td, te, R α, R β and Rmax calculated, Tq (ginseng
See Fig. 2).ECU30 will spray command signal t1, t2, Tq exports Fuelinjection nozzle 10, thus controlling the behaviour of Fuelinjection nozzle 10
Make.ECU30 (memory module) stores the model curve of the model as pressure waveform wherein.Pressure waveform is in multi-injection
In the case that arbitrary second of period and subsequent injection events are for object injection, carrying out the injection thing before object sprays
Part (that is, previous injection events) and do not carry out object injection when pressure waveform.It is noted that multi-injection is defined as
In the often single burn cycle of internal combustion engine, fuel injection event is performed a number of times.This model curve to be expressed by mathematical formulae,
And stored.
Next, being used for controlling from Fuelinjection nozzle 10 by describe with reference to Fig. 2A, 2B and 2C to Fig. 5 A, 5B and 5C
The ejection control method of fuel injection.
Detected value based on fuel pressure sensor 20 represents the fuel pressure occurring in response to injection relatively to detect
Pressure waveform (see Fig. 2 C) in the change of time.Based on the pressure waveform being detected, to calculate expression spraying rate with respect to when
Between change spraying rate waveform (see Fig. 2 B).Subsequently, the injection of the calculated spraying rate waveform (spray regime) of study identification
Rate parameter R α, R β and Rmax.Additionally, identification injection command signal (pulse ON moment t1 and pulse ON time period Tq) and spurting
Spraying rate parameter td of the dependency between state and te are learnt.
Specifically, calculate the near linear L α declining.The near linear L α of this decline is in pressure waveform, from turning
Point P1 is approximately the falling waveform of straight line to flex point P2 by method of least square etc..In flex point P1, fuel pressure is in response to injection
Start and start to reduce.In flex point P2, the reduction of fuel pressure stops.Subsequently, calculate the fuel on declining near linear L α
Pressure becomes the moment (the intersection point moment LB α that L α and B α intersects) during reference value B α.It is conceived to intersection point moment LB α to start with injection
Strong correlation between moment R1, calculates injection start time R1 based on intersection point moment LB α.For example, can calculate in intersection point
Carve the moment of the scheduled delay C α before LB α, as injection start time R1.
Additionally, calculating the near linear L β rising.The near linear L β rising is to turning in pressure waveform, from flex point P3
Point P5 is approximately the rising waveform of straight line by method of least square etc..In flex point P3, fuel pressure is opened in response to the end of injection
Begin to increase.In flex point P5, the increase of fuel pressure stops subsequently, calculating and becoming in fuel pressure on the near linear L β rising
Moment (the intersection point moment LB β that L β and B β intersects) during reference value B β.Be conceived to intersection point moment LB β with injection finish time R4 it
Between strong correlation, based on intersection point moment LB β calculate injection finish time R4.For example, can calculate before intersection point moment LB β
Scheduled delay C β moment, as the fast moment R4 of injection knot.
Next, the strong correlation being conceived between the slope that the slope declining near linear L α and spraying rate increase
Property, calculate what the spraying rate representing in the spraying rate waveform shown in Fig. 2 B increased based on the slope declining near linear L α
The slope of straight line R α.For example, the slope that pre-determined factor calculates R α can be multiplied by by the slope of L α.In a similar manner,
Because rising the slope of near linear L β and the slope of spraying rate reduction is strong correlation, based on rising near linear L β's
Slope is calculating the slope of the straight line R β representing that spraying rate in spraying rate waveform reduces.
Next, based on the straight line R α in spraying rate waveform and R β, calculating valve member 12 in response to terminating the order of injection
The moment (valve shutoff operation start time R23) beginning to decline.Specifically, calculate the intersection point between straight line R α and R β, and
Calculating this intersection point moment is used as valve shutoff operation start time R23.Additionally, calculate injection start time R1 opening with respect to injection
Begin to order the time delay (injection starts td time delay) of moment t1.And, calculate valve shutoff operation start time R23 relatively
Terminate the time delay (injection terminates te time delay) of order moment t2 in injection.
Additionally, the pressure calculating corresponding to the intersection point declining between near linear L α and rising near linear L β is used as handing over
Point pressure P α β.Calculate the pressure differential Δ P γ between the reference pressure Pbase being detailed below and intersection point pressure P α β.Pressure differential Δ P
γ (the first parameter) illustrate fuel pressure in pressure waveform (object waveform) in response to be performed object injection and from ginseng
Examine the degree of pressure Pbase decline.It is conceived to the strong correlation between pressure differential Δ P γ and maximum injection rate Rmax, based on pressure
Power difference Δ P γ is calculating maximum injection rate Rmax.Specifically, it is multiplied by correlation coefficient C γ by pressure differential Δ P γ to calculate
Big spraying rate Rmax.P γ is bigger for pressure differential Δ, and maximum injection rate Rmax being calculated is bigger.However, work as carrying out little injection
When (wherein pressure differential Δ P γ is less than preset value delta P γ th), as described above, Rmax=Δ P γ × C γ.On the other hand, when entering
During the big injection (wherein Δ P γ >=Δ P γ th) of row, calculate the value set in advance (setting value R γ) based on fuel pressure, to make
For maximum injection rate Rmax.
Here, above-mentioned " little injection " is assumed to the injection thing that valve member 12 began to decline before spraying rate reaches R γ
Part.At this moment, the fuel flowing through the high-voltage path 11a of Fuelinjection nozzle 10 is throttled by plate shape surface 11e and 12a, thus determining
Big spraying rate Rmax.On the other hand, above-mentioned " big injection " is assumed to valve member 12 to begin to decline after spraying rate reaches R γ
Injection events.At this moment, the fuel flowing through high-voltage path 11a is throttled by nozzle 11b, thus determining that maximum injection rate Rmax (sets
Definite value R γ).In other words, though when carry out spray order phase Tq long enough and after reaching setting value R γ valve open shape
During the big injection that state also continues to, spraying rate waveform formation trapezoidal (see the solid line of Fig. 2 B).On the other hand, when carrying out valve shutoff operation
During the little injection beginning to before setting value R γ reaches, spraying rate waveform formation triangle (see the dotted line of Fig. 2 B).
Due to above reason, spraying rate parameter td, te, R α, R β and Rmax can be calculated according to pressure waveform.Based on study
Value consider spraying rate parameter td, te, R α, R β and Rmax over time, can calculate corresponding to injection command signal (see
Spraying rate waveform (see Fig. 2 B) Fig. 2A).The area (shaded area of Fig. 2 B) of the spraying rate waveform being computed as above is equal to spray
The amount of penetrating.Therefore, may be based on spraying rate parameter to calculate emitted dose.For example, can calculate (study) the emitted dose being calculated with
Relation between injection subcommand time section Tq, is used as spraying rate parameter.
Fig. 3 is study spraying rate parameter, sets the general frame that the injection command signal of Fuelinjection nozzle 10 etc. is arrived in output.
The part 31,32,33 and 34 being executed by ECU30 to be described hereinafter with reference to Fig. 3.Spraying rate parameter calculating part 31 is based on by fuel
The pressure waveform of pressure transducer 20 detection is calculating spraying rate parameter td, te as above, R α, R β and Rmax.
Study portion 32 by the storage of the spraying rate being calculated parameter and updates in the memorizer of ECU30, thus learning to spray
Rate parameter.Spraying rate parameter is different according to fuel supply pressure (pressure in common rail 42) at that time and emitted dose
Value.Therefore, with the fuel pressure of such as reference pressure Pbase (see Fig. 2 C) and fuel supply pressure, according to spraying rate waveform
Emitted dose during emitted dose Q that area is calculated and subcommand time section Tq in injection described below etc. is in association
Study spraying rate parameter.In the example of fig. 3, the value of the spraying rate parameter being associated with emitted dose Q is stored in spraying rate ginseng
In number figure M1 to M5.By figure M1 to M5 be set as each representative fuel pressure force value (30MPa, 50MPa, 100MPa etc.) and
Differ figure.
By row interpolation, interpolating portion 33 are entered to the learning value of the spraying rate parameter being stored in spraying rate Parameter Map M1 to M5
Calculate and be currently needed for emitted dose and the corresponding spraying rate parameter of fuel pressure.
Configuration part 34, based on the spraying rate parameter being calculated by interpolating portion 33, sets and (needs corresponding to target spray regime
Emitted dose and need injection start time) injection command signal (injection initiation command moment t1 and injection subcommand time
Section Tq).Subsequently, fuel pressure sensor 20 detection has and is observing the injection command signal setting as above to operate fuel
Pressure waveform during injection valve 10 based on the pressure waveform detecting, spraying rate parameter calculating part 31 calculate spraying rate parameter td,
Tc, R α, R β and Rmax.
In other words, actual ejection state (in other words, spraying rate parameter td, te, the R related to injection command signal
α, R β and Rmax) it is detected and learn.Based on learning value, set the injection command signal corresponding to target spray regime.Therefore,
Command signal is sprayed based on actual ejection STATE FEEDBACK CONTROL.Accurately fuel-injection condition can be controlled so that actual ejection
State is matched with target spray regime.Especially, due to carrying out feedback control, thus injection is set based on spraying rate parameter
So that actual ejection quantitative change becomes target injection amount, actual ejection amount can be matched subcommand time section Tq with day mark emitted dose.
Next, to describe the flow chart with reference to Fig. 4 being used for by calculating from detected pressure waveform (see Fig. 2 C)
Spraying rate parameter td, te, R α, R β and Rmax (see Fig. 2 B) carry out the process operation of analysis spraying state.Place's reason bag shown in Fig. 4
The microcomputer including in ECU30 repeats.
First, in step S10, the detected value based on fuel pressure sensor 20 for the ECU30 calculates injection ripple hereinafter described
Shape Wb.In the following description, the cylinder of execution fuel injection is referred to as spraying cylinder.During fuel injection enters injection cylinder
The cylinder stopping being injected into is referred to as non-ejection cylinder.Additionally, the fuel pressure being arranged in the Fuelinjection nozzle 10 of injection cylinder
Force transducer 20 is referred to as eject sensor.It is arranged on the fuel pressure sensor 20 in the Fuelinjection nozzle 10 of non-ejection cylinder
It is referred to as non-ejection sensor.
In step slo, multiple detections that ECU30 acquisition is detected in the predetermined sampling period by eject sensor
Value.ECU30 is subsequently based on detected value and produces and represents in eject sensor in response to spraying occurred fuel pressure change
Fuel pressure waveform Wa (see Fig. 5 A).Next, ECU30 obtains being detected by non-ejection sensor at the predetermined sampling period
Multiple detected values, and produced based on detected value and represent in non-ejection sensor in response to spraying occurred fuel pressure
The fuel pressure waveform Wu (referring to Fig. 5 B) of change.
When fuel is overlapping with time for spraying from the moment that petrolift 41 is pumped into common rail 42, fuel pressure waveform Wu becomes
Become as high waveform in the gross pressure shown in solid in Fig. 5 B.On the other hand, in the fuel injection phase after following fuel injection closely
Between when not carrying out such pumping, the reduction amount of the fuel pressure in whole spraying system is equal to emitted dose.Therefore, fire
Material pressure waveform Wu ' becomes the low waveform of gross pressure as shown in the dotted line of Fig. 5 B.
The component of fuel pressure waveform Wu and Wu ' is also included in fuel pressure waveform Wa.In other words, fuel pressure
Waveform Wa includes representing injection waveform Wb (referring to Fig. 5 C) and the fuel pressure waveform of the fuel pressure change caused by injection
The component of Wu and Wu '.Therefore, in step 10, by deducting non-ejection cylinder from the fuel pressure waveform Wa of injection cylinder
Fuel pressure waveform Wu and Wu ' (Wb=Wa-Wu), to carry out process operation with extract injection waveform Wb.
Next, in step S11 of Fig. 4, ECU30 execution pressure wave (fluctuation) removal hereinafter described is processed.Change sentence
Talk about, when carrying out multi-injection, (it terminates the pressure wave component Wc (see Fig. 2 C) of previously injection for injection events previously
The pulsation of the pressure waveform keeping afterwards) overlapping with fuel pressure waveform Wa.Especially, when previous injection events are sprayed with object
Between interval shorter when, the notable shadow of pressure wave component Wc that the fuel pressure waveform Wa of object injection had previously been sprayed
Ring.Therefore, in step s 11, ECU30 carries out pressure wave (fluctuation) removal process, to deduct previous spray from injection waveform Wb
The pressure wave component Wc penetrating.The pressure wave component Wc (model that previously sprayed can be inferred to from the spray regime of previous injection events
Curve).
In subsequent step S12, based on reference waveform, (it is to carry out the injection that above-mentioned pressure wave removal is processed
In waveform Wb (object waveform) with until fuel pressure, then start decreasing to time period only in response to the beginning of injection relative
The waveform of the part answered), the average fuel pressure that ECU30 calculates reference waveform is used as reference pressure Pbase.For example, ECU30
Can will be set as until the corresponding part of the time period TA through predetermined time quantum with from injection initiation command moment t1
Reference waveform.Alternatively, ECU30 can derivative based on falling waveform calculating flex point P1, and will start to order equal to from injection
The part making the time period to the predetermined time amount before flex point P1 for the moment t1 is set as reference waveform.In other words, join
Examining waveform is not sprayed by Fuelinjection nozzle 10 in the injection waveform Wb having carried out pressure wave removal process
The pressure waveform of time period.More specifically, reference waveform is the pressure waveform following closely before carrying out previous injection events.
In subsequent step S13, based on falling waveform (its be injection waveform Wb in fuel pressure in response to spray
The waveform of time period of penetrating the increase of rate and reducing corresponding part), ECU30 calculates the near linear L α of falling waveform.
For example, the section sets corresponding with the predetermined amount of time TB lighting from can be falling waveform by ECU30, in this point, from
Initiation command moment t1 is through predetermined time quantum for injection.Alternatively, ECU30 can derivative based on falling waveform calculating
Flex point P1 and P2, and subsequently can be by for falling waveform ECU30 by section sets equivalent for the waveform between flex point P1 and P2
Little square law calculates near linear L α according to the multiple fuel pressure detected values (sampled value) constituting this falling waveform.Replaceable
Ground, ECU30 can calculate tangent line at the minimum point of falling waveform interior derivative, is used as near linear L α.
In subsequent step S14, based on rising waveform (its be injection waveform Wb in fuel pressure in response to spray
Penetrate the waveform of the time period corresponding part that rate reduces and increases), ECU30 calculates the near linear L β of this rising waveform.
For example, the section sets corresponding with the predetermined amount of time TC lighting from can be rising waveform by ECU30, in this point, from
Injection terminates order moment t2 through predetermined time quantum.Alternatively, ECU30 can derivative based on rising waveform calculating
Flex point P3 and P5, and section sets equivalent for the waveform between flex point P3 and P5 are rising waveform.ECU30 subsequently can be by
Little square law calculates near linear L β according to the multiple fuel pressure detected values (sampled value) constituting this rising waveform.Replaceable
Ground, ECU30 can calculate tangent line at the maximum point of rising waveform interior derivative, is used as near linear L β.
In subsequent step S15, ECU30 is based on reference pressure Pbase and calculates reference value B α and B β.For example, ECU30
Value less than reference pressure Pbase can be calculated by scheduled volume, be used as reference value B α and B β.Reference value B α and B β do not need by
It is set as identical value.In addition, can be according to reference pressure Pbase, the value of fuel temperature etc. sets this scheduled volume to change.
In subsequent step S16, ECU30 calculates when fuel pressure becomes the reference value B α near linear L α
(the intersection point moment LB α between L α and B α).It is conceived to the strong correlation between intersection point moment LB α and injection start time R1,
ECU30 is based on intersection point moment LB α and calculates injection start time R1.For example, ECU30 can calculate before intersection point moment LB α
Predetermined time delay C α moment, be used as spraying start time R1.
In subsequent step S17, ECU30 calculates when fuel pressure becomes the reference value B β near linear L β
(the intersection point moment LB β between L β and B β).It is conceived to the strong correlation between intersection point moment LB β and injection finish time R4,
ECU30 is based on intersection point moment LB β and calculates injection start time R4.For example, ECU30 can calculate before intersection point moment LB β
Predetermined time delay C β moment, be used as spraying start time R4.Can be according to reference pressure Pbase, fuel temperature etc.
Value sets C α and C β time delay to change.
In subsequent step S18, it is conceived between the slope that the slope of near linear L α and spraying rate increase
Strong correlation, ECU30 calculated in Fig. 2 B based on the slope of near linear L α shown in spraying rate waveform in represent spraying rate
The slope of increased straight line R α.For example, ECU30 can be multiplied by, by making the slope of L α, the inclination that predetermined coefficient calculates R α
Rate.Can based on the injection start time R1 calculating in step S16 and step S18 calculate R α slope identify expression with
The straight line R α of the related rising part of spraying rate waveform of injection command signal.
Additionally, in step S18, being conceived to strong between the slope that the slope of near linear L β and spraying rate reduce
Dependency, ECU30 is calculated based on the slope of near linear L β and represents the straight line R β that spraying rate reduces in spraying rate waveform
Slope.For example, ECU30 can be multiplied by, by making the slope of L β, the slope that predetermined coefficient calculates R β.Can be based on
The injection finish time R4 that step S17 calculates and the slope of the R β calculating in step S18 to identify expression and injection order letter
The straight line R β of number related sloping portion of spraying rate waveform.Can be changed according to the value of reference pressure Pbase, fuel temperature etc.
Set pre-determined factor.
In subsequent step S19, based on the straight line R α in the spraying rate waveform being calculated in step S18 and R β, ECU30
Calculate the moment (valve shutoff operation start time R23) that valve member 12 begins to decline in response to terminating the order of injection.Specifically
Ground, when ECU30 calculates the intersection point between straight line R α and R β and calculates moment of this intersection point and be used as the valve shutoff operation time and start
Carve R23.
In subsequent step S20, ECU30 calculates the injection start time R1 being calculated in step 16 with respect to injection
The time delay (injection starts td time delay) of initiation command moment t1.Additionally, what ECU20 calculating was calculated in step S19
Valve shutoff operation start time R23 terminates the time delay of order moment t2 (injection terminates te time delay) with respect to injection.
Injection terminates te time delay and refers to from providing the moment t2 of the order terminating injection until starting the operation of control valve 14
The time delay in moment.Change sentence work to say, time delay, td and te was the change representing spraying rate with respect to injection command signal
The parameter of operating lag.Furthermore, it is possible to provide the delay from injection initiation command moment t1 to maximum injection rate due in R2
Time, from injection terminate order moment t2 to spraying rate decline start time R3 time delay, from injection terminate order the moment
Time delay of t2 to injection finish time R4 etc..
In subsequent step S21, ECU30 judges the pressure differential Δ P γ between reference pressure Pbase and intersection point pressure
Whether (the first parameter) is less than preset value delta P γ th.When judging Δ P γ ＜ Δ P γ th ("Yes" in step 21),
In subsequent step S22, ECU30 is corrected to pressure differential Δ P γ, to consider above-mentioned model curve to maximum injection rate Rmax
Impact.This process operation is described below.In the case, this injection is considered as little injection by ECU30.In subsequent step
In S23, ECU30 calculates maximum injection rate Rmax based on the pressure differential Δ P γ (Rmax=Δ P γ × C γ) of correction.
On the other hand, when judging Δ P γ ＞ Δ P γ th ("No" in the step s 21), in subsequent step S24
In, ECU30 calculates based on the fuel pressure being fed to Fuelinjection nozzle 10 value set in advance (setting value R γ), is used as
Maximum injection rate Rmax.Pressure (the first parameter) for the fuel being fed to Fuelinjection nozzle 10, is usable in common rail 42
Fuel pressure PC or when spray waveform Wb in do not carry out Fuelinjection nozzle 10 injection when fuel pressure Pi.First ginseng
Number is bigger, and maximum injection rate Rmax being calculated is bigger.In the case, injection is considered as spraying greatly by ECU30.Subsequent
In step S25, ECU30 correction maximum injection rate (setting value R γ), to consider above-mentioned model curve to maximum injection rate Rmax
Impact.This process operation is described below.
Subsequently ECU30 temporarily terminates a series of process operation (end).It is equivalent to work in the process operation of step S10
Process operation for acquisition module.It is equivalent to the process operation as extraction module in the operation that processes of step S11.In step
The operation that processes of S12 is equivalent to the process operation as the first computing module.Step S22 and step S23 process operate with
And operate, in step S24 and processing of step S25, the process operation being all equivalent to as the second computing module.
Fig. 6 is to be shown in be not carried out spraying from previous in the case of the process operation in step S22 and step S25 of Fig. 4
The view of the relation between injection interval that event of penetrating is sprayed to object and actual ejection amount.Here, based on identical electromotor
Load and engine speed (engine behavior) are calculating target spray regime (including the desired value of emitted dose).Based on upper
State spraying rate parameter td, te, R α, Rp and Rmax setting the injection command signal corresponding to the target spray regime being calculated
T1, t2 and Tq, and control the operation of Fuelinjection nozzle 10.Do not carry out the feedback that actual ejection amount is with respect to emitted dose desired value
Control.
As shown in fig. 6, actual ejection amount periodically changes according to injection interval.Desired value and actual spray in emitted dose
There is deviation between the amount of penetrating.Especially, as shown in annulus chain type line, when injection interval very in short-term, desired value and actual ejection amount
Between deviation will increase.
Next, the reason occur this deviation of description between desired value and actual ejection amount.Fig. 7 A to 7C is sequential
Figure, wherein, Fig. 7 A shows actual ejection rate, and Fig. 7 B shows the waveform of multi-injection detection, and Fig. 7 C shows object
Waveform.Here, only change the injection interval spraying from previous injection events to object, and carry out little injection.Show spray
Penetrate the result of the actual measurement of rate.By the pressure arteries and veins caused by the previous injection events that deduct from multi-injection detection waveform
Move (model curve Wm) to obtain object waveform Wt.Reference in Fig. 7 A to 7C corresponds to the accompanying drawing mark in 2B for Fig. 2 Δ
Note.Subscript " 1 " is added to the injection events (waveform represented by solid line) with the shortest injection interval.Subscript " 2 " is added
It is added to the injection events (waveform represented by dotted line) of the tool the longest injection interval of row.
As shown in figs. 7 a-b, between the waveform of actual ejection rate waveform and multi-injection detection, maximum injection rate
The change of Rmax (Rmax1 to Rmax2) and pressure differential Δ P) change of γ (Δ P γ 1 to Δ P γ 2) is related.The opposing party
Face, as illustrated in figs. 7 a and 7 c, between actual ejection rate waveform and object waveform Wt, (Rmax1 arrives maximum injection rate Rmax
Rmax2 change) and the change of pressure differential Δ P γ (Δ P γ 1 to Δ P γ 2) are incoherent.Therefore, when based on object waveform
When Wt is to calculate maximum injection rate Rmax, occur in that the deviation with actual maximum injection rate Rmax.
This is because, although because the differing from of injection interval shown in Fig. 7 B and lead to the combustion when injection starts (flex point P1)
Material pressure is different, but eliminates the difference of the fuel pressure when injection starts in object waveform Wt as seen in figure 7 c.Change
Sentence is talked about, in object waveform Wt, because the fuel pressure when injection starts for the reference model curve Wm to calculate intersection point pressure P
α β, even if therefore as model curve Wm, the fuel pressure when injection starts changes according to injection interval, this change is also simultaneously
Will not be reflected in the calculating of maximum injection rate Rmax.However, as shown in figs. 7 a-b, because the spraying rate of reality is subject in spray
Penetrate the impact of the fuel pressure of fuel pressure during beginning and injection period, the maximum injection rate being calculated based on object waveform Wt
Rmax is deviated with actual maximum injection rate Rmax.
Additionally, when equally being sprayed greatly, because actual ejection rate is subject in the fuel pressure sprayed when starting with spray
The impact of the fuel pressure during penetrating, when calculating maximum injection rate Rmax, needs to consider the fuel pressure when injection starts
With the fuel pressure in injection period.
Here, according to the present embodiment, in order to correct the deviation of all maximum injection rate Rmax so, in step S22 of Fig. 4
Operate with carrying out following process in step S23 and step S24 and step S25.Fig. 8 A to 8C is sequential chart, wherein, Fig. 8 A table
Show driving injection order, Fig. 8 B represents the waveform of multi-injection detection, and Fig. 8 C illustrates object waveform.
In step S22, the model pressure based on the fuel pressure of reflection model curve Wm when carrying out object injection for the ECU30
Power difference Δ Pdif (the second parameter), is corrected to the pressure differential Δ P γ (the first parameter) in object waveform Wt.Specifically,
Modal pressure difference Δ Pdif is that fuel pressure P11 of start time t11 of object injection in model curve Wm is bent with model
Difference between fuel pressure P12 of moment t12 for the line Wm, at moment t12 (or moment corresponding with intersection point pressure P α β),
The fuel pressure strength of object waveform Wt becomes minimum in response to the object injection being performed.ECU30 by modal pressure difference Δ
The product that Pdif is multiplied by correction coefficient Km1 adds to pressure differential Δ P γ, and summation is set as calibrating (base measuring) pressure difference Δ P γ.Correction system
Number Km1 can be fixed value.Alternatively, according to fuel pressure PC in common rail 42 or when the waveform in multi-injection detection
In do not carry out Fuelinjection nozzle 10 injection (before following previous injection events closely) when fuel pressure Pi, correction coefficient Kml
Can be variable.Subsequently, in step S23, ECU30 calculates maximum injection rate Rmax based on the pressure differential Δ P γ of correction
(Rmax=Δ P γ × C γ).
Additionally, as described above, in step s 24, ECU30 calculates based on the fuel pressure being fed to Fuelinjection nozzle 10
(the first parameter) and value set in advance (setting value R γ), are used as maximum injection rate Rmax.Subsequently, in step s 25,
ECU30 is based on modal pressure difference Δ Pdif (the second parameter), to correct maximum injection rate Rmax (setting value R γ).Specifically,
The product that modal pressure difference Δ Pdif is multiplied by correction coefficient Km2 is added to maximum injection rate Rmax by ECU30, and summation is set as
Maximum injection rate Rmax of correction.Alternatively, maximum injection rate Rmax is multiplied by pressure differential Δ P γ and modal pressure by ECU30
The summation of difference Δ Pdif (Δ P γ R) and the ratio (or this ratio is multiplied by the product of correction coefficient Km2) of pressure differential Δ P γ, and will
This product is set as maximum injection rate Rmax correcting.Correction coefficient Km2 can be fixed value.Alternatively, according in common rail 42
In fuel pressure PC or when the injection not carrying out Fuelinjection nozzle 10 in the waveform in multi-injection detection (is following closely previously
Before injection events) when fuel pressure Pi, correction coefficient Km2 can be variable.
The present embodiment described above in detail has advantages below.
When carrying out little injection, based on representing fuel pressure in object waveform in response to the object injection that just carrying out
From reference pressure Pbase decline degree intersection point pressure P α β (the first parameter) and reflection when just carry out object spray when in mould
Modal pressure difference Δ Pdif (the second parameter) of the fuel pressure in type curve Wm, to calculate the maximum injection rate of object injection
Rmax.Here, intersection point pressure P α β and maximum injection rate Rmax of object injection have strong correlation.Additionally, this modal pressure is poor
Δ Pdif reflects the impact to maximum injection rate Rmax for the model curve Wm being separated with object waveform Wt.Therefore, except with
Maximum injection rate Rmax of object injection has outside the intersection point pressure P α β of strong correlation, is also based on reflection model curve Wm pair
The modal pressure difference Δ Pdif of the impact of maximum injection rate Rmax, to calculate maximum injection rate Rmax.Therefore, when based on object ripple
Shape Wt come to calculate object injection maximum injection rate Ranax when, can accurately calculate maximum injection rate Rmax.
When being sprayed greatly, based on when the combustion of the injection not carrying out Fuelinjection nozzle 10 in multi-injection detection waveform
Material pressure Pi (the first parameter) and reflection are poor in the modal pressure of the fuel pressure of model curve Wm when just carrying out object injection
Δ Pdif (the second parameter), to calculate maximum injection rate Rmax (setting value R γ) of object injection.Here, fuel pressure Pi with
Maximum injection rate Rmax of object injection has strong correlation.Additionally, this modal pressure difference Δ Pdif reflects and object waveform
The impact to maximum injection rate Rmax for the model curve Wm that Wt is separated.Therefore, the maximum injection rate except spraying with object
Ranax has outside fuel pressure Pi of strong correlation, also based on the reflection impact to maximum injection rate Rmax for the model curve Wm
Modal pressure difference Δ Pdif, to calculate maximum injection rate Rmax.Therefore, it can accurately calculate the maximum spout of object injection
Penetrate rate Rmax.
Modal pressure difference Δ Pdif is the second parameter, and it is the start time t11 of the object injection in model curve Wm
Difference between fuel pressure P12 of moment t12 of fuel pressure P11 and model curve Wm, (or and intersection point at moment t12
The pressure P α β corresponding moment), the fuel pressure of object waveform Wt becomes minimum in response to the object injection just carrying out.Cause
This, can more precisely calculate maximum injection rate Rmax of object injection.
The invention is not restricted to the description according to the present embodiment and can be changed as follows.Additionally, can each reality of combination in any
Apply the feature configuration of example.
The process operation of step S22 in the diagram and step S23 can be changed as follows.In other words, in step
In S22, ECU30 calculates maximum injection rate Rmax based on the pressure differential Δ P γ (the first parameter) of object waveform Wt.In step
In S23, ECU30 is based on modal pressure difference Δ Pdif (the second parameter) and corrects maximum injection rate Rmax.Specifically, ECU30
Maximum injection rate Rmax can be corrected in the way of similar with step S24 of above-mentioned Fig. 4.
The process operation of step S24 in the diagram and step S25 can be changed as follows.In other words, in step
In S24, the modal pressure difference Δ Pdif of the fuel pressure based on the model curve Wm being reflected in when just carrying out object injection for the ECU30
(the second parameter), to correct fuel pressure Pi (the first parameter) of the fuel being fed to Fuelinjection nozzle 10.Specifically,
The product that modal pressure difference Δ Pdif is multiplied by correction coefficient Kml is increased to fuel pressure Pi by ECU30, and summation is set as school
Positive fuel pressure Pi.Correction coefficient Km1 can be fixed value.Alternatively, according to fuel pressure PC in common rail 42 or
Person is in the waveform that multi-injection detects when not carrying out injection (before the following previous injection events closely) of Fuelinjection nozzle 10
Fuel pressure Pi, correction coefficient Kml is variable.Subsequently, in step s 25, ECU30 based on correction fuel pressure Pi Lai
Calculate maximum injection rate Rmax.
As shown in Fig. 9 A to 9C, as modal pressure difference Δ Pdif (the second parameter), it is possible to use in model curve Wm
Object injection fuel pressure P11 of start time t11 with model curve Wm in the spray not carrying out Fuelinjection nozzle 10
Penetrate the difference between fuel pressure P13 of (before following previous injection events closely).Modal pressure difference Δ Pdif in such cases
Differ an error pressure Δ Per with the poor Δ Pdif of the modal pressure shown in Fig. 8.However, it is substantially similar for tending to.Due to this
Plant configuration, maximum injection rate Rmax of object injection can accurately be calculated by simple configuration.
As shown in Fig. 2A to 2C and Fig. 7 A to 7C, as the first parameter, it is possible to use in reference pressure Pbase and in object
Pressure differential Δ P between flex point P2 in waveform Wt and the fuel pressure of P23.This pressure differential Δ P show also in object waveform
The degree that fuel pressure in Wt reduces from reference pressure Pbase in response to the object injection just carrying out.
According to the above embodiments, fuel pressure sensor 20 is arranged in Fuelinjection nozzle 10.However, fuel pressure passes
Sensor 20 only needs for being arranged to detect in the combustion in the fuel feed lines of nozzle 11b from the outlet 42 of common rail 42
The fuel pressure sensor of material pressure.Therefore, fuel pressure sensor may be mounted to that connection common rail 42 and Fuelinjection nozzle 10
Pressure piping 42b in.In other words, connect the pressure piping 42b of common rail 42 and Fuelinjection nozzle 10 and in main body 11
High-voltage path 11a be equal to " fuel feed lines ".
Claims (9)
1. a kind of device for controlling fuel injection being applied to fuel injection system, described fuel injection system includes fuel
Injection valve and fuel pressure sensor, described Fuelinjection nozzle sprays the fuel of burning internal combustion engine, described combustion from nozzle
Fuel pressure in the fuel feed lines extending to described nozzle for the material pressure transducer detection, described device can control combustion
To carry out multi-injection, wherein, fuel is injected multiple during the single burn cycle of described internal combustion engine, described many for material injection
Secondary injection includes in check object injection and the previous injection before the injection of described object, and described device includes：
Acquisition module, it is used for obtaining multi-injection waveform, and described multi-injection waveform is to represent carrying out described multi-injection
When the pressure waveform of the change of fuel pressure that detected by described fuel pressure sensor；
Memory module, it is used for storage model curve, and described model curve is used as to carry out described elder generation during described multi-injection
Front injection and do not carry out the model of described pressure waveform determined by during the injection of described object；
Extraction module, it is used for deducting described model curve from described multi-injection waveform, and extracts due to the spray of described object
The pressure waveform penetrated and lead to is used as object waveform；
First computing module, its be used for based in the described object waveform when not carrying out the injection by described Fuelinjection nozzle
Fuel pressure is calculating reference pressure；And
Second computing module, the first parameter that it is used for based on the second parameter and in described object waveform calculates described object
The maximum injection rate of injection, described first parameter represent fuel pressure in response to the described object injection that just carrying out from described ginseng
Examine the degree of pressure reduction, described second parameter reflects the fuel of the described model curve when just carrying out described object injection
Pressure.
2. device according to claim 1, wherein,
Described first parameter is defined as the pressure between described reference pressure and droop line and the fuel pressure of riser intersection
Power is poor, and described droop line represents the approximate of the part that fuel pressure reduces in described object waveform, and described riser represents
In described object waveform, the part of fuel pressure increase is approximate.
3. device according to claim 2, wherein,
Described second computing module is configured to calculate described maximum injection rate so that described pressure differential is bigger, described maximum spout
Penetrate rate higher.
4. a kind of device for controlling fuel injection being applied to fuel injection system, described fuel injection system includes fuel
Injection valve and fuel pressure sensor, described Fuelinjection nozzle sprays the fuel of burning internal combustion engine, described combustion from nozzle
Fuel pressure in the fuel feed lines extending to described nozzle for the material pressure transducer detection, described device can control combustion
To carry out multi-injection, wherein, fuel is injected multiple during the single burn cycle of described internal combustion engine, described many for material injection
Secondary injection includes in check object injection and the previous injection before the injection of described object, and described device includes：
Acquisition module, it is used for obtaining multi-injection waveform, and described multi-injection waveform is to represent carrying out described multi-injection
When the pressure waveform of the change of fuel pressure that detected by described fuel pressure sensor；
Memory module, it is used for storage model curve, and described model curve is used as to carry out described elder generation during described multi-injection
Front injection and do not carry out the model of described pressure waveform determined by during the injection of described object；
Extraction module, it is used for deducting described model curve from described multi-injection waveform, and extracts due to the spray of described object
The pressure waveform penetrated and lead to is used as object waveform；
Computing module, it is used for calculating the maximum injection rate of described object injection based on the first parameter and the second parameter, described
First parameter is the fuel pressure in described multi-injection waveform when not carrying out the injection of described Fuelinjection nozzle, described
Two parameters reflect the fuel pressure of the described model curve when just carrying out described object injection.
5. device according to claim 4, wherein,
Described computing module is configured to calculate described maximum injection rate so that described first parameter is bigger, described maximum injection
Rate is higher.
6. the device according to any one of claim 1 to 5, wherein,
Described second parameter be defined as the fuel pressure of start time of described object injection in described model curve with
Become the described model curve in minimum moment in the fuel pressure of described object waveform in response to the object injection just carrying out
Fuel pressure between difference.
7. the device according to claim 1 or 4, wherein,
Described second parameter be defined as the fuel pressure of start time of described object injection in described model curve with
Difference between the fuel pressure when not carrying out the injection by described Fuelinjection nozzle in described model curve.
8. the device according to claim 1 or 3, wherein,
Described second computing module is configured to calculate, based on described second parameter, the described maximum injection that will increase or reduce
Rate.
9. the device according to claim 4 or 5, wherein,
Described computing module is configured to calculate, based on described second parameter, the described maximum injection rate that will increase or reduce.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2012121007A JP5565435B2 (en) | 2012-05-28 | 2012-05-28 | Fuel injection control device |
| JP2012-121007 | 2012-05-28 |
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| CN103511106A CN103511106A (en) | 2014-01-15 |
| CN103511106B true CN103511106B (en) | 2017-03-01 |
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| CN201310296382.2A Active CN103511106B (en) | 2012-05-28 | 2013-05-28 | Optimize the fuel injection control system of multi-injection |
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| JP6215718B2 (en) * | 2014-01-22 | 2017-10-18 | トヨタ自動車株式会社 | Fuel injection characteristic detection device |
| DE102014205686A1 (en) * | 2014-03-26 | 2015-10-01 | Mtu Friedrichshafen Gmbh | Method for operating an internal combustion engine, method for determining a learning structure for the operation of an internal combustion engine, control unit for an internal combustion engine and internal combustion engine |
| CN113513422B (en) * | 2021-06-01 | 2022-09-23 | 潍柴动力股份有限公司 | Multi-injection fuel quantity compensation method and device, electronic control unit and storage medium |
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| CN2200698Y (en) * | 1994-05-16 | 1995-06-14 | 北内集团总公司 | Gasoline machine with mini-computer controlled fuel spurt and direct ignition for internal-combustion engine |
| CN1450258A (en) * | 2002-03-11 | 2003-10-22 | 三菱自动车工业株式会社 | Divided fuel injection control apparatus |
| JP2010003004A (en) * | 2008-06-18 | 2010-01-07 | Denso Corp | Learning device and fuel injection system |
| JP2010223184A (en) * | 2009-03-25 | 2010-10-07 | Denso Corp | Fuel injection state detection device |
| CN102287289A (en) * | 2010-06-18 | 2011-12-21 | 株式会社电装 | Fuel-pressure waveform detector |
-
2012
- 2012-05-28 JP JP2012121007A patent/JP5565435B2/en active Active
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2013
- 2013-05-24 DE DE102013105355.6A patent/DE102013105355B4/en active Active
- 2013-05-28 CN CN201310296382.2A patent/CN103511106B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2200698Y (en) * | 1994-05-16 | 1995-06-14 | 北内集团总公司 | Gasoline machine with mini-computer controlled fuel spurt and direct ignition for internal-combustion engine |
| CN1450258A (en) * | 2002-03-11 | 2003-10-22 | 三菱自动车工业株式会社 | Divided fuel injection control apparatus |
| JP2010003004A (en) * | 2008-06-18 | 2010-01-07 | Denso Corp | Learning device and fuel injection system |
| JP2010223184A (en) * | 2009-03-25 | 2010-10-07 | Denso Corp | Fuel injection state detection device |
| CN102287289A (en) * | 2010-06-18 | 2011-12-21 | 株式会社电装 | Fuel-pressure waveform detector |
| JP2012002173A (en) * | 2010-06-18 | 2012-01-05 | Denso Corp | Fuel-pressure waveform obtaining device |
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| DE102013105355B4 (en) | 2019-08-01 |
| JP5565435B2 (en) | 2014-08-06 |
| CN103511106A (en) | 2014-01-15 |
| JP2013245633A (en) | 2013-12-09 |
| DE102013105355A1 (en) | 2013-11-28 |
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