CN102305140A - Fuel injector starting time measuring equipment and fuel injector - Google Patents
Fuel injector starting time measuring equipment and fuel injector Download PDFInfo
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- CN102305140A CN102305140A CN201110261378A CN201110261378A CN102305140A CN 102305140 A CN102305140 A CN 102305140A CN 201110261378 A CN201110261378 A CN 201110261378A CN 201110261378 A CN201110261378 A CN 201110261378A CN 102305140 A CN102305140 A CN 102305140A
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Abstract
The invention relates to fuel injector starting time measuring equipment and a fuel injector. The fuel injector starting measuring equipment successively sends a series of boosting instructions in sequence; through monitoring a current response wave form on the coil of the fuel injector, which is caused by a controlled voltage impulse corresponding to each boosting instruction, the fuel injector armature drop time corresponding to each boosting instruction can be calculated; and after the series of boosting instructions are sent completely and a series of corresponding fuel injector armature drop time is calculated, the maximum value in the series of fuel injector armature drop time can be determined, and finally the fuel injector starting time can be determined according to the boost voltage duration of the controlled voltage impulse corresponding to the maximum fuel injector armature drop time.
Description
Technical field
The present invention relates generally to the open-interval equipment of the oil sprayer in the high pressure co-rail system of measuring motor, and the oil sprayer that comprises this equipment.
Background technique
In the high pressure co-rail system of motor, electric-controlled fuel injector is a critical component wherein, and the accurate control of fuel injection quantity and injection advance angle directly influences the power character and the Economy of motor.Usually, the control of fuel injection quantity is carried out through the opening time length of the solenoid valve of control oil sprayer.Therefore, in order accurately to control the fuel injection quantity of oil sprayer, the amount of time that needs the accurate solenoid valve of controlling oil sprayer to open.That is to say, must accurately obtain the time point that fuel injector magnetic system is opened.
In addition, the accurate control of injection advance angle needs the time point of accurate fuel injector magnetic system unlatching especially.
Yet, the definite time point of the unlatching of fuel injector magnetic system and be different from the time point that powers on to fuel injector magnetic system in reality, but certain hysteresis is arranged.
To Fig. 1 C, it illustrates the waveform that coil actuator in the one-period of oil sprayer work is applied to the controlled voltage on the fuel injector magnetic system coil from top to bottom successively referring to Figure 1A; Driving current in the coil over time; And with the stroke of the Needle shaft of the corresponding fuel injector magnetic system of this driving current over time.
Shown in Fig. 1 C, during the applying of the HV (also possibly be called " built-up voltage " in the literary composition) of for example 48V, the stroke of Needle shaft remains zero basically like Figure 1A, keeps static promptly basically.This is because the reactance characteristic of coil makes the driving current growth of starting from scratch; Need certain hour could form enough big electric current and produce the enough electromagnetic forces that can work, overcome armature in the solenoid valve deadweight and Returnning spring pulling force and make armature motion.Needle shaft can move and have only armature to move afterwards.Therefore the action of armature and Needle shaft etc. needs certain starting time.The concrete amount of time of this starting time is relevant with the characteristic of solenoid valve.Wherein this characteristic is such as resistance that comprises the fuel injector magnetic system coil and inductance, the elasticity coefficient of Returnning spring, and friction factor etc.In addition, clearly the concrete amount of time of starting time is also relevant with the size of the voltage that applies.
In real work, after the running of engine long time, above-mentioned characteristic is such as the elasticity coefficient of resistance and the inductance and the Returnning spring of oil sprayer coil, and friction factor all can change.Thereby this response characteristic that can cause fuel injector magnetic system particularly fuel injector magnetic system amount lag time of opening changes.In addition, along with engine aged, the size of the voltage that coil actuator can provide also has certain reduction.Therefore, along with engine aged, the time point that fuel injector magnetic system is opened can drift about.
Injection time only when motor dispatches from the factory, directly is used as the time that powers up of oil sprayer as by present most motor producer, then through to injection advance angle with power up the demarcation of time and compensate the actual fuel injection time.Yet the problem of aging of oil sprayer is not considered in this compensation.After oil sprayer was aging, deviation can take place with the actual opening time point of oil sprayer in this compensation.Therefore,, certainly will influence the accurate control of fuel injection quantity, thereby influence the various performances of motor if fuel injection parameter is not revised.
Therefore, also can accurately control the method for fuel injection quantity and injection advance angle even need under a kind of situation that can change at opening time point because of reason oil sprayer reality such as wearing out.
Summary of the invention
Mode of execution of the present invention provides the equipment that can measure actual injector opening time point, thus can to since former thereby injector opening time variation such as aging compensate.
According to an aspect of the present invention, a kind of injector opening time measuring equipment is provided, has comprised: control gear, be used to send the pressurization instruction, the built-up voltage endurance of controlled voltage pulse has been specified in said pressurization; The coil pressurization device, it receives the pressurization instruction from control gear, and the controlled voltage pulse is applied to the coil of oil sprayer according to said pressurization instruction; Current sensor device, it measures the electric current on the coil of oil sprayer, and will measure current value and send to said control gear; Wherein said control gear is further used for, and sends a series of pressurization instructions successively, and the built-up voltage endurance of the controlled voltage pulse of each the pressurization instruction appointment in said a series of pressurization instructions changes in oil sprayer armature hunting zone rise time continuously; Through the current-responsive waveform that the controlled voltage pulse of using said measurement current value monitoring to instruct corresponding to each pressurization causes on the coil of oil sprayer, calculate the corresponding oil sprayer armature of each pressurization instruction and take a seat the time; And after the transmission of accomplishing said a series of pressurizations instructions and corresponding a series of oil sprayer armature are taken a seat the calculating of time; Confirm said a series of oil sprayer armature maximum value in the time of taking a seat, and according to confirming injector opening time with take a seat built-up voltage endurance of corresponding controlled voltage pulse of time of maximum oil sprayer armature.
According to another aspect of the present invention; A kind of oil sprayer that comprises above-mentioned injector opening time measuring equipment is provided, when wherein said control gear is further used for coming the oil sprayer real work according to the injector opening time of confirming power up the time and injection advance angle compensates.
Injector opening time measuring equipment through according to embodiment of the present invention is measured actual injector opening time; Even the opening time point because of reason oil sprayer reality such as wearing out changes; Also corresponding correction can be made, thereby fuel injection quantity and injection advance angle can be accurately controlled.
Description of drawings
Come to describe in further detail each side of the present invention referring now to the accompanying drawing that current preferred implementation of the present invention is shown.In the accompanying drawing:
Figure 1A illustrates the waveform that coil actuator in the one-period of oil sprayer work is applied to the controlled voltage on the fuel injector magnetic system coil from top to bottom successively to Fig. 1 C; Driving current in the coil over time; And with the stroke of the Needle shaft of the corresponding fuel injector magnetic system of this driving current over time;
Fig. 2 illustrates the functional block diagram according to the injector opening time measuring equipment of embodiment of the present invention;
Fig. 3 illustrates the structural drawing according to the basic physical unit of the electric-controlled fuel injector of embodiment of the present invention;
Fig. 4 illustrates the functional block diagram according to the electronic control unit of the electric-controlled fuel injector of embodiment of the present invention (ECU).
Fig. 5 illustrates according to one embodiment of the present invention, has realized a physical circuit of coil actuator and coil current sample circuit.
Fig. 6 illustrates according to coil actuator in the one-period of the oil sprayer work of one embodiment of the present invention and is applied to the waveform of the controlled voltage on the fuel injector magnetic system coil, and comprise in the coil of counter current peak value waveform driving current over time.
Fig. 7 illustrates according to one embodiment of the present invention, in the process of search injector opening time, is applied to the waveform of the controlled voltage on the fuel injector magnetic system coil, and comprise in the coil of counter current peak value waveform driving current over time.
The flow chart of Fig. 8 for example illustrates the roughly step of the method that the oil sprayer injection advance angle and the time that powers up are compensated that can be carried out by the microcontroller in the electronic control unit;
The plotted curve of Fig. 9 A and Fig. 9 B illustrate respectively in the said method seek endurance that armature picks up the built-up voltage that progressively increases in the process of endurance in stage to the drawing that scans number of times and corresponding time of taking a seat to scanning the drawing of number of times.
Embodiment
Describe injector opening time measuring equipment and oil sprayer with reference to the accompanying drawings in detail according to embodiment of the present invention.Identical reference character refers to components identical in institute's drawings attached.
Fig. 2 illustrates the functional block diagram according to the injector opening time measuring equipment 200 of one embodiment of the present invention.As shown in Figure 2, injector opening time measuring equipment 200 according to the embodiment of the present invention comprises control gear 201, coil pressurization device 202, and current sensor device 203.Control gear 201 is used to send the pressurization instruction, and the built-up voltage endurance of controlled voltage pulse has been specified in said pressurization.Coil pressurization device 202 receives the pressurization instruction from control gear, and the controlled voltage pulse is applied to the coil of oil sprayer according to said pressurization instruction.Current sensor device 203 is measured the electric current on the coil of oil sprayers, and will measure current value and send to said control gear.Wherein control gear 201 is further used for, and sends a series of pressurization instructions successively, and the built-up voltage endurance of the controlled voltage pulse of each the pressurization instruction appointment in said a series of pressurization instructions changes in oil sprayer armature hunting zone rise time continuously; Through the current-responsive waveform that the controlled voltage pulse of using the monitoring of measurement current value to instruct corresponding to each pressurization causes on the coil of oil sprayer, calculate each pressurization and instruct corresponding oil sprayer armature to take a seat the time; And after the transmission of accomplishing said a series of pressurizations instructions and corresponding a series of oil sprayer armature are taken a seat the calculating of time; Confirm said a series of oil sprayer armature maximum value in the time of taking a seat, and according to confirming injector opening time with take a seat built-up voltage endurance of corresponding controlled voltage pulse of time of maximum oil sprayer armature.
According to an embodiment of the invention, the current-responsive waveform comprises the counter current pulse, wherein control gear 201 with the said built-up voltage endurance finish the time be carved into time between the moment that peak value appears in said counter current pulse and confirm as armature and take a seat the time.
According to an embodiment of the invention; Control gear 201 is taken a seat built-up voltage endurance of corresponding controlled voltage pulse of time through relevant with the gentle oil pressure of oil Needle shaft being added to rise time with maximum oil sprayer armature, confirms injector opening time.
According to an embodiment of the invention, the built-up voltage endurance of each the pressurization instruction appointment in said a series of pressurization instructions changes in oil sprayer armature hunting zone rise time with fixed increment continuously.
According to an embodiment of the invention, the built-up voltage endurance of each the pressurization instruction appointment in said a series of pressurization instructions changes in oil sprayer armature hunting zone rise time with transformable increment continuously.
According to an embodiment of the invention, said transformable increment is less near rise time at the oil sprayer armature of estimating.
Other mode of executions of the present invention provide the oil sprayer that comprises according to the injector opening time measuring equipment 200 of above-mentioned mode of execution, when wherein control gear 201 is further used for coming the oil sprayer real work according to the injector opening time of confirming power up the time and injection advance angle compensates.
According to an embodiment of the invention, the injector opening time measuring equipment 200 periodic measurement injector opening times in above-mentioned oil sprayer.
According to an embodiment of the invention, injector opening time measuring equipment in above-mentioned oil sprayer 200 is measured injector opening time in response to external command.
Below in conjunction with the plotted curve of Figure 1A to Fig. 1 C, and Fig. 3, Fig. 4 and Fig. 5 specify the detailed process that oil sprayer is opened.Wherein Fig. 3 illustrates the basic physical arrangement according to the electric-controlled fuel injector 1 of embodiment of the present invention; Fig. 4 illustrates the functional block diagram according to the electronic control unit (ECU) 2 of the electric-controlled fuel injector 1 of embodiment of the present invention.
As shown in Figure 3, the functional part of the basic physical arrangement of the electric-controlled fuel injector 1 that will be referred in below describing roughly comprises: the electromagnet coil 3 with external lead wire WA and external lead wire WB; The armature 4 that has ball valve 5 on the lower central part; Has the control chamber 6 that discharges control hole 7; Low pressure chamber 8; Return aperture 9; Oil-filled control hole 10 with small diameter; Needle shaft 11 with needle-valve pressure ring 12; Spray orifice 13; Filler opening 14; Needle-valve chamber 15; With Returnning spring SC, SD, and SE.
As shown in Figure 4, according to an embodiment of the invention, the electronic control unit 2 of electric-controlled fuel injector 1 is mainly implemented by microcontroller (MCU) 16 and each miscellaneous function unit.Fig. 4 only shows the part miscellaneous function unit that will be referred in the following description.As shown in Figure 4; These miscellaneous function unit comprise and are used for coil current sample circuit 17 and analog-digital converter (A/D) 18 that the coil current of the electromagnet coil 3 of oil sprayer is sampled, and are used for the driver 19 that the electromagnet coil 3 to oil sprayer drives.In an embodiment of the invention, driver 19 for example applies driving voltage through external lead wire WA and external lead wire WB to the electromagnet coil 3 of oil sprayer.
Also as shown in Figure 4, MCU 16 comprises the central processing unit (CPU) 20 through bus and so on coupling, random access storage device (RAM) 21, flash memory 22, and time processing unit (TPU) 23.According to another implementation of the invention, flash memory 22 also can be positioned at outside the MCU 16.According to another implementation of the invention, flash memory 22 also can be substituted by other nonvolatile memory.RAM 21 can be written into operation MCU 16 necessary various programs and data under the routine work state.Flash memory 22 has for example been stored the various firmware programs of MCU 16 etc., and it for example can store various oil spout Control Parameter, for example injector opening time with spray anterior angle etc.The instruction that TPU 23 can send according to CPU 20 sent various pulse control signals to MCU 16 outside drivers 19, the waveform of the voltage that applies to the electromagnet coil 3 of oil sprayer with controlling and driving device 19.This will describe in detail hereinafter.
As it will be understood by those skilled in the art that MCU 16 can also comprise for other necessary functional parts of its proper functioning, for example: sheet menu unit; External bus interface unit (EBI), test cell, clock unit; The Internal Bus management unit, and/or queued serial module etc.
Describe driver 19 and coil current sample circuit 17 in detail with reference to figure 5 below.Fig. 5 illustrates according to one embodiment of the present invention, has realized a physical circuit of driver 19 and coil current sample circuit 17, has wherein also drawn electromagnet coil 3.
As shown in Figure 5, according to an embodiment of the invention, driver 19 can comprise two high-end metal-oxide-semiconductor Q1 and Q2, low side metal-oxide-semiconductor Q3 and sustained diode.The drain electrode of high-end metal-oxide-semiconductor Q1 is connected to built-up voltage V
SuperchargingOne of its source electrode is connected to an end of electromagnet coil 3, among for example go between WA and the lead-in wire WB; Its grid receives the pulse control signal highside_ctl_1 from TPU 23.The drain electrode of high-end metal-oxide-semiconductor Q2 is connected to keeps voltage V
KeepIts source electrode be connected to electromagnet coil 3 connection the end of source electrode of high-end metal-oxide-semiconductor Q1, one of among for example go between WA and the lead-in wire WB; Its grid receives the pulse control signal highside_ctl_2 from TPU 23.The source electrode of low side metal-oxide-semiconductor Q3 is connected to earth potential; Its drain electrode is connected to electromagnet coil 3 and the different the other end of the end source electrode that has connected high-end metal-oxide-semiconductor Q1 and Q2 via sampling resistor R_sample, another among for example go between WA and the WB that goes between; Its grid receives the pulse control signal lowside_ctl from TPU 23.The anode of sustained diode is connected to the drain electrode of low side metal-oxide-semiconductor Q3, and its negative electrode is connected to the source electrode of high-end metal-oxide-semiconductor Q1 and Q2.
Therefore; TPU 23 is through applying different pulse control signal highside_ctl_1, highside_ctl_2 and lowside_ctl to corresponding high-end metal-oxide-semiconductor Q1 and Q2 and low side metal-oxide-semiconductor Q3; Can the different controlled voltage pulse be applied to electromagnet coil 3 (because the resistance of sampling resistor R_sample is very little, can think basically that voltage mainly is applied on the electromagnet coil 3).
For example, when highside_ctl_1 and lowside_ctl are high level, and highside_ctl_2 is when being low level, with built-up voltage V
SuperchargingBe applied to electromagnet coil 3; When highside_ctl_2 and lowside_ctl are high level, and highside_ctl_1 will keep voltage V when being low level
KeepBe applied to electromagnet coil 3; When highside_ctl_1 and highside_ctl_2 and lowside_ctl are low level, there is not voltage to be applied to electromagnet coil 3.
TPU 23 is high level or low level endurance through controlling highside_ctl_1 and highside_ctl_2 and lowside_ctl respectively; Can control respectively to electromagnet coil 3 and apply built-up voltage and the endurance of keeping voltage, and the endurance that does not apply voltage.
Coil current sample circuit 17 can comprise sampling resistor R_sample and operational amplifier U1A.As shown in Figure 5, sampling resistor R_sample and electromagnet coil 3 are connected in series, and the voltage at its two ends is input to normal phase input end and the inverting input of operational amplifier U1A respectively.Thereby the extent of the voltage at sampling resistor R_sample two ends has been represented the size of the electric current that flows through electromagnet coil 3.This voltage difference for example is enlarged into coil current sampled voltage V by operational amplifier U1A
Sampling, and for example output to A/D18 (being shown in Fig. 4).
Sampling resistor R_sample that is connected in series and electromagnet coil 3 and constitute the closed-loop path with sustained diode between the drain electrode of the source electrode of high-end metal-oxide-semiconductor Q1 and Q2 and low side metal-oxide-semiconductor Q3.Therefore, even when high-end metal-oxide-semiconductor Q1 and Q2 and low side metal-oxide-semiconductor Q3 turn-off, sampling resistor R_sample still can detect the electric current in the closed-loop path that resistor R _ sample, electromagnet coil 3 and sustained diode constitute.This point is crucial especially for the present invention.
Certainly, it will be appreciated by those skilled in the art that when high-end metal-oxide-semiconductor Q1 and Q2 and low side metal-oxide-semiconductor Q3 turn-off, the voltage on resistor R _ sample two ends, promptly the positive of operational amplifier U1A and reverse inter-input-ing voltage possibly be at random.Therefore; According to the embodiment of the present invention; Operational amplifier U1A can be the operational amplifier with big input voltage range; Perhaps operational amplifier U1A inside can comprise suitable voltage translation and/or convergent-divergent circuit or voltage, with the input voltage translation and/or zoom in the scope of be fit to handling, perhaps converts the electric current in being fit to the scope of handling to.It will be appreciated by those skilled in the art that the amount of difference of voltage that operational amplifier U1A importantly can obtain to represent sampling resistor R_sample two ends is as output.This output can be that voltage also can be electric current.
Refer again to Fig. 3, the working procedure of electric-controlled fuel injector 1 is roughly following.Under the routine work state, filler opening 14 links to each other with high pressure connecting tube (not shown) usually, thereby is full of fuel oil in the needle-valve chamber 15 and keeps higher pressure.When not between the external lead wire WA of coil 3 and external lead wire WB, not applying voltage, electric-controlled fuel injector remains on state of rest.The ball valve 5 on the armature 4 was pressed down by the pulling force of the deadweight of armature 4 and Returnning spring SC and SD and closed release control hole 7 this moment.Pressure in the control chamber 6 is identical with the pressure maintenance in the needle-valve chamber 15 through oil-filled control hole 10 at this moment, thereby Needle shaft 11 is remained on the position of blocking spray orifice 13.
When an injection period began, MCU 16 controlling and driving devices 19 (being shown in Fig. 4) applied voltage for coil 3 through lead-in wire WA and lead-in wire WB.According to an embodiment of the invention, driver 19 at first is applied to coil 3 through lead-in wire WA and lead-in wire WB with the for example built-up voltage of about 48V, shown in Figure 1A.This built-up voltage acts on the supercharging electric current that generation is started from scratch cumulative on the coil 3, shown in Figure 1B, thereby forms cumulative electromagnetic force.When electromagnetic force was increased to greater than the deadweight of armature and has overcome the pulling force of Returnning spring, armature 4 was quickened to draw from static the beginning.Ball valve 5 on the armature 4 rises with the rising of armature 4, cause discharging control hole 7 and be opened, thereby the fuel oil in the control chamber 6 is released in the low pressure chamber 8.Because the diameter of oil-filled control hole 10 is very little, slower to replenishing of the fuel oil in the control chamber 6, make Low oil Fuel in the control chamber 6, this causes the pressure in the control chamber 6 to be lower than the pressure in the needle-valve chamber 15.As a result of, the high pressure in the needle-valve chamber 15 acts on the needle-valve pressure ring 12 and makes Needle shaft 11 under action of pressure, begin to move up.
When the supercharging electric current increases to certain amplitude (supercharging upper current limit; 24A for example) time; MCU16 controlling and driving device 19 is reduced to low voltage (being also referred to as " keeping voltage " in the literary composition) with built-up voltage; For example half the (the for example 24V) of built-up voltage keeps electric current thereby coil current drops to from the supercharging electric current, for example 12A.Keeping under the electric current, armature 4 is remained on the top of the cavity that armature 4 is positioned at by the suction of coil 3, discharges control hole 6 and stays open, and Needle shaft 11 continues to rise.When Needle shaft 11 is moved upwards up to certain position, the oil sprayer commencement of fuel injection thereby spray orifice 13 is opened.Needle shaft 11 continuation risings are run into the upper wall of control chamber 6 up to its top and are remained there.After this oil sprayer keeps spray orifice 13 oil spouts from opening.
When stop said keeping voltage after, oil sprayer armature 4 is taken a seat under the effect of dead weight and Returnning spring SC and SD.The ball valve 5 of moment armature 4 belows contacts with the open-topped rigidity that discharges control hole 7 owing to take a seat, and armature 4 produces resilience, and this can produce a little counter current in electromagnetic valve coil.
As stated; Because sampling resistor R_sample among the present invention in the coil current sample circuit 17 and electromagnet coil 3 constitute the closed-loop path with sustained diode; This counter current sampling resistor R_sample that will flow through, so coil current sample circuit 17 can detect the appearance and the amplitude size thereof of this counter current.Shown in the little current spike waveform on right side among Fig. 6 lower waveform figure.
The left side waveform is the drive current waveform that causes in response to applying of controlled voltage pulse in the electromagnetic valve coil 3 among Fig. 6 lower waveform figure, and it is corresponding with waveform among Figure 1B.Controlled voltage pulse from Fig. 6 (upper waveform among Fig. 6) can be found out with the comparison of drive current waveform; After the controlled voltage pulse stops; After promptly being applied to voltage on the electromagnetic valve coil and being zero, the electric current in the electromagnetic valve coil descends rapidly, so the electromagnetic attraction of solenoid valve also descends rapidly; Oil sprayer armature 4 is taken a seat under the effect of dead weight and Returnning spring SC and SD, and resilience produces the counter current spike.Time between the moment (bounce-back of taking a seat) that the moment that therefore, can the Time Calculation of taking a seat of oil sprayer armature 4 be stopped for the controlled voltage pulse and counter current peak value occur.
What more than describe is in a conventional injection period of oil sprayer, the roughly working procedure of oil sprayer.Can find out that therefrom the opening time of oil sprayer roughly can be divided into two stages.Phase I is also referred to as armature and picks up the stage, and it is from beginning that electromagnetic valve coil is applied the controlled voltage pulse is drawn onto the chamber at its place by electromagnetic valve coil up to oil sprayer armature time at top.The endurance of this phase I is depended on the resistance and the inductance of fuel injector magnetic system coil, the elasticity coefficient of Returnning spring, and friction factor, and the size of the voltage that applies on the electromagnetic valve coil or the like.Therefore, this endurance phase I receives aging influence easily and drifts about.For example aging along with oil sprayer, the resistance of fuel injector magnetic system coil and inductance, the elasticity coefficient of Returnning spring, friction factor, and the voltage that applies on the electromagnetic valve coil all possibly change, thus influence the endurance of this phase I.Second stage is the Needle shaft ascent stage, and it is to be promoted to move by high pressure and its top reaches the control chamber top and time of opening spray orifice fully up to Needle shaft from oil sprayer armature is drawn onto the chamber at its place by electromagnetic valve coil moment at top.Can think that generally the endurance of this second stage is determined that by oil pressure in the high pressure co-rail system and oil temperature therefore, it is basically with aging irrelevant.
On the basis of above understanding; The inventor finds armature to pick up endurance (being also referred to as " armature rise time " in the literary composition) in stage through test at first progressively, and then will add endurance that this armature picks up the stage to according to the oil pressure and the endurance (being also referred to as " Needle shaft rise time " in the literary composition) of the needle-valve ascent stage of oil thermometer calculation and obtain opening time of whole oil sprayer.
Particularly; The inventor recognizes; Be applied on the electromagnetic valve coil under the situation in the built-up voltage pulse that the endurance is not enough; The built-up voltage pulse did not just stop when for example armature also was drawn onto the top of armature chamber, and the time of taking a seat of armature this moment will be proportional to endurance of the built-up voltage pulse that applies.Fig. 7 illustrates so a kind of situation, and not being applied to when armature is drawn onto the top of armature chamber (be armature place chamber) as yet of built-up voltage just stops, so the lower height of armature has determined that its time of taking a seat will be less than taking a seat the time in the conventional injection period.It may be noted that; After built-up voltage stops; Its electric current can not disappear at once owing to the inductance characteristic of electromagnetic valve coil; Also be that electromagnetic valve coil also will keep certain suction a period of time, and armature itself has certain speed that makes progress, so armature also drop to zero and begin tenesmus with the rising certain height up to the speed that makes progress.The height that certainly should rise maybe be very little, because because the deadweight of armature itself is bigger, the pulling force etc. that receives oil liquid resistance and Returnning spring in addition acts on and the rate of climb own is slower.
Those skilled in the art can recognize; As long as the endurance of the built-up voltage that applies is not enough to armature is drawn onto the top (height of the peak that armature reaches is lower than the top of armature chamber) of armature chamber; The height that armature is picked up is high more, and its time of taking a seat will be big more.That is to say that the time of taking a seat of armature will be proportional to the endurance of the built-up voltage pulse that applies in the case.When endurance of the built-up voltage that applies at the top (height of the peak that armature reaches just in time is the top of armature chamber) that just in time armature is drawn onto armature chamber, the time of taking a seat of this moment should be maximum.The endurance of built-up voltage is substantially equal to the endurance that armature recited above picks up the stage in the case.
If further increase the endurance of the built-up voltage that applies again slightly, armature will bump with the certain very little initial velocity and the top of armature chamber so, and this collision will make the time of taking a seat of armature diminish.
Therefore visible; Through from being not enough to endurance of built-up voltage that armature attracts to reach the top of armature chamber is begun progressively to increase the endurance of built-up voltage; And measure corresponding taking a seat the time of each accordingly endurance; Be enough to make armature to bump up to the endurance of the built-up voltage that applies, can find that the maximum value of a part appears in the time of taking a seat to the relation of the endurance of built-up voltage with the certain very little initial velocity and the top of armature chamber.Those skilled in the art should understand that; As stated, the local maximum of this time of taking a seat is corresponding to making that the height of the peak that armature reaches just in time is endurance of built-up voltage at the top (also be armature when reaching the top of armature chamber speed just in time drop to zero) of armature chamber.
As stated; Because the height that armature rises after built-up voltage stops is very little; Therefore; Basically can think the above-mentioned height that makes the peak that armature reaches just in time be the top of armature chamber (also be armature when reaching the top of armature chamber speed just in time drop to zero) built-up voltage endurance corresponding to, armature is drawn onto time at top of the chamber at its place in the real work by electromagnetic valve coil, also is the endurance that armature picks up the stage.
For oil pressure and oil temperature decision,, can think that its motor for same batch or model is identical basically with aging change very little Needle shaft rise time.Therefore can measure like this: in the motor of batch or model, select at least one and installation position displacement sensor on each the Needle shaft therein; In the controlled voltage pulse that applies shown in Figure 1A, can record the Needle shaft trip map shown in Fig. 1 C, therefrom can record the time that applies up to the Needle shaft complete opening from the controlled voltage pulse.Can think that the time of this Needle shaft complete opening is that above-mentioned armature picks up the time in stage and the time sum of Needle shaft ascent stage.
Therefore, this Needle shaft complete opening time is deducted the armature that records pick up the endurance in stage, just can obtain Needle shaft rise time.Can test the Needle shaft rise time of at least one motor under the different gentle oil pressure of a plurality of oil of selecting; Obtain basically not with the relation of the aging Needle shaft rise time that changes the gentle oil pressure of oil; As the motor of this batch or model basically not with the relation of the aging Needle shaft rise time that changes to the gentle oil pressure of oil; Be stored in each motor of this batch or model, for example be stored in the flash memory 22 of above-mentioned MCU 16.
Thereby; Might be after injector opening time be owing to aging the variation; Carry out the scanning that the above-mentioned built-up voltage endurance increases continuously; Find the endurance in the stage that picks up owing to the aging armature that changes, and according to the oil pressure of work and oil temperature add in the flash memory 22 that for example is stored in above-mentioned MCU 16 basically not with the aging Needle shaft rise time that changes, obtain the injector opening time that changes owing to wearing out.Afterwards, can according to this more the injector opening time of " truly " injection advance angle of oil sprayer real work and the time that powers up are compensated, thereby even at injector opening time since wear out change after, also can more accurately control fuel injection quantity.
Below with reference to the diagram shows of the flow chart of Fig. 8 and Fig. 9 A and Fig. 9 B according to the method described above to the oil sprayer injection advance angle with power up the object lesson that the time compensates.Wherein, the flow chart of Fig. 8 for example illustrates the roughly step of the method that the oil sprayer injection advance angle and the time that powers up are compensated that can be carried out by the MCU in the electronic control unit 2 16; The plotted curve of Fig. 9 A and Fig. 9 B illustrate respectively in the said method seek endurance that armature picks up the built-up voltage that progressively increases in the process of endurance in stage to the drawing that scans number of times and corresponding time of taking a seat to scanning the drawing of number of times.
Referring to Fig. 8, in step 800, MCU 16 (specifically can be the CPU20 among the MCU 16) carries out initialization action, and the endurance that counting variable n is set to the inferior built-up voltage pulse of initial value 1, the n (n=1 this moment) is set to T (powering up) n=T (powering up)
InitiallyT (powering up)
InitiallyFor example can be 0, can be the nonzero value that is provided with in advance perhaps, half of the armature pick-up time when for example dispatching from the factory or 1/3rd.
In step 801; CPU 20 sends order and gives TPU 23; Instruction TPU 23 sends pulse control signal to driver 19, will be that built-up voltage (for example 48V) pulse (the for example voltage pulse shown in the top of Fig. 7) of T (powering up) n is applied to oil sprayer coil 3 endurance.
In step 802, measure built-up voltage apply end the time be carved into the time between the moment that the counter current peak value occurs, promptly the endurance is the corresponding armature of built-up voltage pulse of T (powering up) n time T (taking a seat) n that takes a seat.
In step 803, counts variable n, and the endurance of the n time built-up voltage pulse be set to T (powering up) n=T (powering up) n-1+ Δ T.Wherein Δ T is the incremental change of the endurance of built-up voltage pulse.
In step 804, judge whether the endurance of the n time built-up voltage pulse that process increases progressively has equaled or exceeded scanning upper limit T (powering up)
The upper limit
If the endurance of the n time built-up voltage pulse does not also reach scanning upper limit T (powering up)
The upper limit, then program is got back to step 801, and CPU 20 sends order and gives TPU 23, and instruction TPU23 sends pulse control signal to driver 19, will be that built-up voltage (for example 48V) pulse of T (powering up) n is applied to oil sprayer coil 3 endurance.Afterwards the measurement of execution in step 802 and step 803 operation such as increase progressively, up in step 804, judging once more.
Otherwise, reached scanning upper limit T (powering up) if in the judgement of step 804, confirm the endurance of the n time built-up voltage pulse
The upper limit, then EOP end of program scanning, and advance to step 805.In step 805, confirm maximum of T (taking a seat) max among T (taking a seat) n of all measurements.Scanning upper limit T (powering up) in the preceding text
The upper limitIt can be the endurance that possible armature picks up the stage when estimating that oil sprayer is scrapped.
Afterwards, in step 806, will confirm as the endurance that armature picks up the stage with the take a seat application time of the corresponding built-up voltage of time T (taking a seat) max of determined maximum.
In step 807; Pick up the endurance in stage according to the armature of confirming and confirm current injector opening time; The oily gentle oil pressure through according to real work time the for example adds the Needle shaft of correspondence the endurance that definite armature picks up the stage to rise time.
In step 808,, revise the injection advance angle in the oil spout control of electronic control unit 2 when the oil sprayer real work and power up the time according to determined current injector opening time.Term in the literary composition " powers up the time " and is appreciated that to the built-up voltage endurance and keeps voltage endurance sum.
Since according to this more the injector opening time of " truly " injection advance angle of oil sprayer real work and the time that powers up are compensated, thereby even after injector opening time changes owing to wearing out, also can more accurately control fuel injection quantity.
Although the built-up voltage endurance changes in oil sprayer armature hunting zone rise time with fixed increment continuously in the description of preceding text; But it will be understood by those skilled in the art that the built-up voltage endurance can change with transformable increment fully continuously in oil sprayer armature hunting zone rise time.
For example, the increment when approaching oil sprayer armature built-up voltage endurance during rise time of estimating can diminish.The oil sprayer armature of this expectation can be last the measurement and oil sprayer armature rise time of storage rise time.
According to an embodiment of the invention, MCU 16 can be automatically regularly carries out and measures injector opening time, and to the injection advance angle of oil sprayer real work with power up the program that the time compensates.
According to another implementation of the invention, MCU 16 can carry out the measurement injector opening time in response to external command, and to the injection advance angle of oil sprayer real work with power up the program that the time compensates.
Although the present invention has combined its concrete illustrative embodiments to be described, what be prone to see is, multiple alternative, revise and distortion is prone to see to those skilled in the art.Thus, be schematically and also non-limiting in this illustrative embodiments of the present invention of illustrating.Can under the situation that does not break away from the spirit and scope of the present invention, modify.
Employed in this disclosure measure word " one ", " a kind of " etc. do not get rid of plural number.Any reference character in claims all should not be construed as the restriction to scope.
Claims (9)
1. injector opening time measuring equipment comprises:
Control gear is used to send the pressurization instruction, and the built-up voltage endurance of controlled voltage pulse has been specified in said pressurization;
The coil pressurization device, it receives the pressurization instruction from control gear, and the controlled voltage pulse is applied to the coil of oil sprayer according to said pressurization instruction;
Current sensor device, it measures the electric current on the coil of oil sprayer, and will measure current value and send to said control gear;
Wherein said control gear is arranged to, and sends a series of pressurization instructions successively, and the built-up voltage endurance of the controlled voltage pulse of each the pressurization instruction appointment in said a series of pressurization instructions changes in oil sprayer armature hunting zone rise time continuously; Through the current-responsive waveform that the controlled voltage pulse of using said measurement current value monitoring to instruct corresponding to each pressurization causes on the coil of oil sprayer, calculate the corresponding oil sprayer armature of each pressurization instruction and take a seat the time; And after the transmission of accomplishing said a series of pressurizations instructions and corresponding a series of oil sprayer armature are taken a seat the calculating of time; Confirm said a series of oil sprayer armature maximum value in the time of taking a seat, and according to confirming injector opening time with take a seat built-up voltage endurance of corresponding controlled voltage pulse of time of maximum oil sprayer armature.
2. according to the injector opening time measuring equipment of claim 1; Wherein said current-responsive waveform comprises the counter current pulse, wherein said control gear with the said built-up voltage endurance finish the time be carved into time between the moment that peak value appears in said counter current pulse and confirm as armature and take a seat the time.
3. according to the injector opening time measuring equipment of claim 1; Wherein said control gear is taken a seat built-up voltage endurance of corresponding controlled voltage pulse of time through relevant with the gentle oil pressure of oil Needle shaft being added to rise time with maximum oil sprayer armature, confirms injector opening time.
4. according to the injector opening time measuring equipment of claim 1, the built-up voltage endurance of each the pressurization instruction appointment in wherein said a series of pressurization instructions changes in oil sprayer armature hunting zone rise time with fixed increment continuously.
5. according to the injector opening time measuring equipment of claim 1, the built-up voltage endurance of each the pressurization instruction appointment in wherein said a series of pressurization instructions changes in oil sprayer armature hunting zone rise time with transformable increment continuously.
6. according to the injector opening time measuring equipment of claim 5, wherein said transformable increment is less near rise time at the oil sprayer armature of estimating.
7. when oil sprayer that comprises according to the injector opening time measuring equipment of claim 1, wherein said control gear are further used for coming the oil sprayer real work according to the injector opening time of confirming power up the time and injection advance angle compensates.
8. according to the oil sprayer of claim 7, wherein said injector opening time measuring equipment periodic measurement injector opening time.
9. according to the oil sprayer of claim 7, wherein said injector opening time measuring equipment is measured injector opening time in response to external command.
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| CN201110261378.3A CN102305140B (en) | 2011-08-30 | 2011-08-30 | Fuel injector starting time measuring equipment and fuel injector |
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| CN201110261378.3A CN102305140B (en) | 2011-08-30 | 2011-08-30 | Fuel injector starting time measuring equipment and fuel injector |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527338A (en) * | 2013-10-29 | 2014-01-22 | 潍柴动力股份有限公司 | Oil injection correction method and system |
| CN103994006A (en) * | 2014-06-13 | 2014-08-20 | 天津大学 | Fuel injector needle valve response time measuring system and measuring method |
| CN108204307A (en) * | 2016-12-16 | 2018-06-26 | 通用汽车环球科技运作有限责任公司 | For controlling the system and method for fluid injection |
| CN109186981A (en) * | 2018-09-18 | 2019-01-11 | 上海工程技术大学 | A kind of high-power nozzle group valve discharge characteristic is test bed |
| CN110187182A (en) * | 2019-06-29 | 2019-08-30 | 潍柴动力股份有限公司 | A kind of monitoring method and device |
| CN110206652A (en) * | 2019-06-29 | 2019-09-06 | 潍柴动力股份有限公司 | A kind of method and system for the spring degree of aging detecting fuel injector |
| CN110261088A (en) * | 2019-06-29 | 2019-09-20 | 潍柴动力股份有限公司 | A kind of method and system for the spring degree of aging detecting fuel injector |
| CN113586303A (en) * | 2021-08-23 | 2021-11-02 | 一汽解放汽车有限公司 | Oil injection time determining system and vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5199402A (en) * | 1991-02-25 | 1993-04-06 | Melchior Jean F | Device for injecting liquid such as fuel into at least one pressurized chamber of a periodic operation machine such as an internal combustion engine and engine of this type equipped with this device |
| CN1236417A (en) * | 1997-07-30 | 1999-11-24 | 罗伯特·博施有限公司 | Fuel injection device for internal combustion engines |
| CN1261647A (en) * | 2000-02-17 | 2000-08-02 | 上海交通大学 | Electrically controlled fuel oil sprayer of diesel engine with controlled fuel oil spray starting point only |
| EP0864037B1 (en) * | 1996-10-02 | 2002-03-20 | Robert Bosch Gmbh | Fuel injection pump with a timing-device piston for timing beginning of injection |
| CN202250428U (en) * | 2011-08-30 | 2012-05-30 | 潍柴动力股份有限公司 | Measurement equipment of opening time of oil injector and oil injector |
-
2011
- 2011-08-30 CN CN201110261378.3A patent/CN102305140B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5199402A (en) * | 1991-02-25 | 1993-04-06 | Melchior Jean F | Device for injecting liquid such as fuel into at least one pressurized chamber of a periodic operation machine such as an internal combustion engine and engine of this type equipped with this device |
| EP0864037B1 (en) * | 1996-10-02 | 2002-03-20 | Robert Bosch Gmbh | Fuel injection pump with a timing-device piston for timing beginning of injection |
| CN1236417A (en) * | 1997-07-30 | 1999-11-24 | 罗伯特·博施有限公司 | Fuel injection device for internal combustion engines |
| CN1261647A (en) * | 2000-02-17 | 2000-08-02 | 上海交通大学 | Electrically controlled fuel oil sprayer of diesel engine with controlled fuel oil spray starting point only |
| CN202250428U (en) * | 2011-08-30 | 2012-05-30 | 潍柴动力股份有限公司 | Measurement equipment of opening time of oil injector and oil injector |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527338A (en) * | 2013-10-29 | 2014-01-22 | 潍柴动力股份有限公司 | Oil injection correction method and system |
| CN103527338B (en) * | 2013-10-29 | 2016-03-16 | 潍柴动力股份有限公司 | A kind of oil injection correction method and system |
| CN103994006A (en) * | 2014-06-13 | 2014-08-20 | 天津大学 | Fuel injector needle valve response time measuring system and measuring method |
| CN108204307B (en) * | 2016-12-16 | 2021-05-11 | 通用汽车环球科技运作有限责任公司 | System and method for controlling fluid injection and vehicle |
| CN108204307A (en) * | 2016-12-16 | 2018-06-26 | 通用汽车环球科技运作有限责任公司 | For controlling the system and method for fluid injection |
| CN109186981A (en) * | 2018-09-18 | 2019-01-11 | 上海工程技术大学 | A kind of high-power nozzle group valve discharge characteristic is test bed |
| CN110187182A (en) * | 2019-06-29 | 2019-08-30 | 潍柴动力股份有限公司 | A kind of monitoring method and device |
| CN110206652A (en) * | 2019-06-29 | 2019-09-06 | 潍柴动力股份有限公司 | A kind of method and system for the spring degree of aging detecting fuel injector |
| CN110261088A (en) * | 2019-06-29 | 2019-09-20 | 潍柴动力股份有限公司 | A kind of method and system for the spring degree of aging detecting fuel injector |
| CN110261088B (en) * | 2019-06-29 | 2021-03-16 | 潍柴动力股份有限公司 | Method and system for detecting aging degree of spring of oil sprayer |
| CN110187182B (en) * | 2019-06-29 | 2022-07-15 | 潍柴动力股份有限公司 | Monitoring method and device |
| CN113586303A (en) * | 2021-08-23 | 2021-11-02 | 一汽解放汽车有限公司 | Oil injection time determining system and vehicle |
| CN113586303B (en) * | 2021-08-23 | 2022-07-19 | 一汽解放汽车有限公司 | Oil injection time determining system and vehicle |
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