CN102305140B - 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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- CN102305140B CN102305140B CN201110261378.3A CN201110261378A CN102305140B CN 102305140 B CN102305140 B CN 102305140B CN 201110261378 A CN201110261378 A CN 201110261378A CN 102305140 B CN102305140 B CN 102305140B
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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 critical component wherein, and the accurate control of fuel injection quantity and injection advance angle directly affects power character and the Economy of motor.Conventionally, the control of fuel injection quantity is undertaken by 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 solenoid valve of accurately 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 that accurate fuel injector magnetic system is opened especially.
But, the definite time point of the unlatching of fuel injector magnetic system be different from the time point powering on to fuel injector magnetic system in practice, but have certain hysteresis.
Referring to Figure 1A, to Fig. 1 C, it illustrates that the one-period coil driver of oil sprayer work is applied to the waveform of the controlled voltage on fuel injector magnetic system coil from top to bottom successively; Driving current in coil over time; And the stroke of the Needle shaft of the fuel injector magnetic system corresponding with this driving current over time.
If Figure 1A is to as shown in Fig. 1 C, during the applying of the high voltage (also may be called " built-up voltage " in literary composition) of for example 48V, the stroke of Needle shaft remains zero substantially, substantially keeps static.This is because the reactance characteristic of coil makes the driving current growth of starting from scratch, need certain hour could form enough large electric current and produce the enough electromagnetic forces that can work, overcome in solenoid valve the deadweight of armature and the pulling force of Returnning spring and make armature motion.Can move and only have armature to move Needle shaft 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 to the characteristic of solenoid valve.Wherein this characteristic is such as comprising resistance and the inductance of fuel injector magnetic system coil, 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 applying.
In real work, when after motor long time running, above-mentioned characteristic is such as the elasticity coefficient of resistance and inductance and the Returnning spring of oil sprayer coil, and friction factor all can change.Thereby this can cause response characteristic amount lag time that particularly fuel injector magnetic system is opened of fuel injector magnetic system to change.In addition,, along with engine aging, the size of the voltage that coil actuator can provide also has certain reduction.Therefore,, along with engine aging, the time point that fuel injector magnetic system is opened can drift about.
Injection time only, in the time that motor dispatches from the factory, is directly used as the power-up time of oil sprayer as, then by the demarcation of injection advance angle and power-up time is compensated to the actual fuel injection time by current most motor producer.But the problem of aging of oil sprayer is not considered in this compensation.After oil sprayer is aging, there is deviation with the opening time point of oil sprayer reality in this compensation meeting.Therefore, if fuel injection parameter is not revised, certainly will affect the accurate control of fuel injection quantity, thereby affect the various performances of motor.
Therefore, a kind ofly can, in the case of because the opening time point of the reason oil sprayer reality such as aging changes, also can accurately control the method for fuel injection quantity and injection advance angle even if need.
Summary of the invention
Embodiments of the present invention provide the equipment that can measure actual injector opening time point, thereby can be to because the injector opening time former thereby that change such as aging compensates.
According to an aspect of the present invention, provide a kind of injector opening time measuring equipment, having comprised: control gear, for sending pressurization instruction, the built-up voltage endurance of controlled voltage pulse has been specified in described pressurization instruction; Coil pressurization device, it receives the pressurization instruction of self-control device, and according to described pressurization instruction, controlled voltage pulse is applied to the coil of oil sprayer; Current sensor device, the electric current on the coil of its measurement oil sprayer, and measurement current value is sent to described control gear; Wherein said control gear is further used for, and sends successively a series of pressurization instructions, and the built-up voltage endurance of the controlled voltage pulse that the each pressurization instruction in described a series of pressurization instructions is specified changes continuously in oil sprayer armature hunting zone rise time; By using described measurement current value to monitor the current-responsive waveform causing corresponding to the controlled voltage pulse of each pressurization instruction on the coil of oil sprayer, calculate oil sprayer armature corresponding to each pressurization instruction and take a seat the time; And take a seat after the calculating of time completing the transmission of described a series of pressurization instructions and corresponding a series of oil sprayer armature, determine the maximum value that described a series of oil sprayer armature was taken a seat in the time, and according to determining injector opening time with take a seat built-up voltage endurance of controlled voltage pulse corresponding to 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, and power-up time and injection advance angle when wherein said control gear is further used for according to definite injector opening time oil sprayer real work compensate.
Measure actual injector opening time by the injector opening time measuring equipment according to embodiment of the present invention, even because the opening time of the reason oil sprayer reality such as aging point changes, also corresponding correction can be made, thereby fuel injection quantity and injection advance angle can be accurately controlled.
Accompanying drawing explanation
Referring now to the accompanying drawing that current preferred implementation of the present invention is shown, each aspect of the present invention is described in further detail.In accompanying drawing:
Figure 1A illustrates that to Fig. 1 C the one-period coil driver of oil sprayer work is applied to the waveform of the controlled voltage on fuel injector magnetic system coil from top to bottom successively; Driving current in coil over time; And the stroke of the Needle shaft of the fuel injector magnetic system corresponding with this driving current over time;
Fig. 2 illustrates according to the functional block diagram of the injector opening time measuring equipment of embodiment of the present invention;
Fig. 3 illustrates according to the structural drawing of the basic physical unit of the electric-controlled fuel injector of embodiment of the present invention;
Fig. 4 illustrates according to the functional block diagram of 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 the one-period coil driver of the oil sprayer work of one embodiment of the present invention and is applied to the waveform of the controlled voltage on fuel injector magnetic system coil, and comprises that driving current in the coil of counter current peak value waveform 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 fuel injector magnetic system coil, and comprises that driving current in the coil of counter current peak value waveform over time.
The flow chart of Fig. 8 for example illustrates the roughly step of the method that oil sprayer injection advance angle and power-up time are compensated that can be carried out by the microcontroller in electronic control unit;
The plotted curve of Fig. 9 A and Fig. 9 B illustrates respectively in said method in the endurance of finding the built-up voltage that armature progressively increases in picking up the process of endurance in stage scanning the drawing of number of times, and the corresponding time of taking a seat is to scanning the drawing of number of times.
Embodiment
Describe with reference to the accompanying drawings injector opening time measuring equipment and oil sprayer according to embodiment of the present invention in detail.In institute's drawings attached, identical reference character refers to identical element.
Fig. 2 illustrates according to the functional block diagram of 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 for sending pressurization instruction, and the built-up voltage endurance of controlled voltage pulse has been specified in described pressurization instruction.Coil pressurization device 202 receives the pressurization instruction of self-control device, and according to described pressurization instruction, controlled voltage pulse is applied to the coil of oil sprayer.Current sensor device 203 is measured the electric current on the coil of oil sprayer, and measurement current value is sent to described control gear.Wherein control gear 201 is further used for, and sends successively a series of pressurization instructions, and the built-up voltage endurance of the controlled voltage pulse that the each pressurization instruction in described a series of pressurization instructions is specified changes continuously in oil sprayer armature hunting zone rise time; Measure current value by use and monitor the current-responsive waveform causing corresponding to the controlled voltage pulse of each pressurization instruction on the coil of oil sprayer, calculate oil sprayer armature corresponding to each pressurization instruction and take a seat the time; And take a seat after the calculating of time completing the transmission of described a series of pressurization instructions and corresponding a series of oil sprayer armature, determine the maximum value that described a series of oil sprayer armature was taken a seat in the time, and according to determining injector opening time with take a seat built-up voltage endurance of controlled voltage pulse corresponding to time of maximum oil sprayer armature.
According to an embodiment of the invention, current-responsive waveform comprises counter current pulse, wherein control gear 201 by the described built-up voltage endurance finish time be carved into time between the moment that peak value appears in described counter current pulse and be defined 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 controlled voltage pulse corresponding to time by relevant to oil temperature and oil pressure Needle shaft being added to rise time with maximum oil sprayer armature, determines injector opening time.
According to an embodiment of the invention, the built-up voltage endurance that the each pressurization instruction in described a series of pressurization instructions is specified changes in oil sprayer armature hunting zone rise time continuously with fixed increment.
According to an embodiment of the invention, the built-up voltage endurance that the each pressurization instruction in described a series of pressurization instructions is specified changes in oil sprayer armature hunting zone rise time continuously with transformable increment.
According to an embodiment of the invention, described transformable increment is less near oil sprayer armature rise time of estimating.
Other mode of executions of the present invention provide the oil sprayer comprising according to the injector opening time measuring equipment 200 of above-mentioned mode of execution, and power-up time and injection advance angle when wherein control gear 201 is further used for according to definite injector opening time oil sprayer real work compensate.
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, the injector opening time measuring equipment 200 in above-mentioned oil sprayer is measured injector opening time in response to external command.
Below in conjunction with Figure 1A, to the plotted curve of Fig. 1 C, and Fig. 3, Fig. 4 and Fig. 5 describe the detailed process that oil sprayer is opened in detail.Wherein Fig. 3 illustrates according to the basic physical arrangement of the electric-controlled fuel injector 1 of embodiment of the present invention; Fig. 4 illustrates according to the functional block diagram of the electronic control unit (ECU) 2 of the electric-controlled fuel injector 1 of embodiment of the present invention.
As shown in Figure 3, below in description, the functional part of the basic physical arrangement of the electric-controlled fuel injector relating to 1 is roughly comprised: the electromagnet coil 3 with external lead wire WA and external lead wire WB; In lower central part, there is the armature 4 of ball valve 5; There is the control chamber 6 in release control hole 7; Low-pressure cavity 8; Return aperture 9; There is the oil-filled control hole 10 of small diameter; There is the Needle shaft 11 of 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 in following description the part miscellaneous function unit relating to.As shown in Figure 4, these miscellaneous function unit comprise coil current sample circuit 17 and the analog-digital converter (A/D) 18 of sampling for the coil current of the electromagnet coil 3 to oil sprayer, and the driver 19 driving for the electromagnet coil 3 to oil sprayer.In an embodiment of the invention, driver 19 for example applies driving voltage by 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 by the central processing unit (CPU) 20 of 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 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 the operation necessary various programs of MCU 16 and data under 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 parameters, such as injector opening time and injection anterior angle etc.The instruction that TPU 23 can send according to CPU 20 is sent various pulse control signals to the driver 19 of MCU 16 outsides, to control the waveform of the voltage that driver 19 applies to the electromagnet coil 3 of oil sprayer.This below will describe in detail.
As it will be understood by those skilled in the art that, MCU 16 for example can also comprise, for other necessary functional parts of its normal work: sheet menu unit, external bus interface unit (EBI), test cell, clock unit, Internal Bus management unit, and/or queued serial module etc.
Describe driver 19 and coil current sample circuit 17 in detail below with reference to Fig. 5.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
supercharging; Its source electrode is connected to one end of electromagnet coil 3, for example, go between WA and lead-in wire one of in 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 and maintains voltage V
maintain; Its source electrode be connected to electromagnet coil 3 connection one end of source electrode of high-end metal-oxide-semiconductor Q1, one of for example go between in WA and 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; The different the other end in the one end of source electrode from having connected high-end metal-oxide-semiconductor Q1 and Q2 that its drain electrode is connected to electromagnet coil 3 via sampling resistor R_sample, another in WA and lead-in wire WB for example goes between; Its grid receives the pulse control signal lowside_ctl from TPU 23.The anodic bonding of sustained diode is 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 by 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, different controlled voltage pulses can be applied to electromagnet coil 3 (because the resistance of sampling resistor R_sample is very little, can substantially think that voltage is mainly applied on electromagnet coil 3).
For example, when highside_ctl_1 and lowside_ctl are high level, and highside_ctl_2 is while being low level, by built-up voltage V
superchargingbe applied to electromagnet coil 3; When highside_ctl_2 and lowside_ctl are high level, and highside_ctl_1 is while being low level, will maintain voltage V
maintainbe applied to electromagnet coil 3; In the time that highside_ctl_1 and highside_ctl_2 and lowside_ctl are low level, do not have voltage to be applied to electromagnet coil 3.
TPU 23 is high level or low level endurance by controlling respectively highside_ctl_1 and highside_ctl_2 and lowside_ctl, can control respectively to electromagnet coil 3 and apply built-up voltage and maintain the endurance of voltage, and not execute the alive endurance.
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 respectively normal phase input end and the inverting input of operational amplifier U1A.Thereby the extent of the voltage at sampling resistor R_sample two ends has represented the size of the electric current that flows through electromagnet coil 3.This voltage difference is for example enlarged into coil current sampled voltage V by operational amplifier U1A
sampling, and for example output to A/D18 (seeing Fig. 4).
The sampling resistor R_sample being connected in series and electromagnet coil 3 between the source electrode of high-end metal-oxide-semiconductor Q1 and Q2 and the drain electrode of low side metal-oxide-semiconductor Q3, and with sustained diode form closed-loop path.Therefore,, even in the time that 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 form.This point is crucial especially for the present invention.
Certainly, it will be appreciated by those skilled in the art that in the time that 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, the positive of operational amplifier U1A and reverse inter-input-ing voltage may be random.Therefore, according to the embodiment of the present invention, operational amplifier U1A can be the operational amplifier with large input voltage range, or operational amplifier U1A inside can comprise suitable voltage translation and/or convergent-divergent circuit or voltage/current conversion circuit, with by input voltage translation and/or zoom to be applicable to process scope in, or convert to be applicable to process scope in electric current.It will be appreciated by those skilled in the art that the amount of difference that operational amplifier U1A importantly can obtain the voltage that represents sampling resistor R_sample two ends is as output.This output can be that voltage can be also electric current.
Refer again to Fig. 3, the working procedure of electric-controlled fuel injector 1 is roughly as follows.Under routine work state, filler opening 14 is connected with high-pressure connecting pipe (not shown) conventionally, thereby in needle-valve chamber 15, is full of fuel oil and keeps higher pressure.In the time not applying voltage between the external lead wire WA of coil 3 and external lead wire WB, electric-controlled fuel injector remains on state of rest.Now the ball valve 5 on armature 4 is pressed down by the pulling force of the deadweight of armature 4 and Returnning spring SC and SD and closes release control hole 7.Now the pressure in control chamber 6 keeps identical by oil-filled control hole 10 with the pressure in needle-valve chamber 15, thereby Needle shaft 11 is remained on to the position of blocking spray orifice 13.
In the time that an injection period starts, MCU 16 controls driver 19 (seeing Fig. 4) and applies voltage by lead-in wire WA and lead-in wire WB to coil 3.According to an embodiment of the invention, first driver 19 is applied to coil 3 by lead-in wire WA and lead-in wire WB by for example built-up voltage of about 48V, as shown in Figure 1A.This built-up voltage acts on the supercharging electric current that on coil 3, generation is started from scratch cumulative, as shown in Figure 1B, thereby forms cumulative electromagnetic force.When electromagnetic force is increased to when being greater than the deadweight of armature and having overcome the pulling force of Returnning spring, armature 4 is accelerated to draw from static beginning.Ball valve 5 on armature 4 rises with the rising of armature 4, causes release control hole 7 to be opened, thereby the fuel oil in control chamber 6 is released in low-pressure cavity 8.Because the diameter of oil-filled control hole 10 is very little, slower to supplementing of the fuel oil in control chamber 6, make the Low oil Fuel in control chamber 6, this causes pressure in control chamber 6 lower than the pressure in needle-valve chamber 15.As a result of, the high pressure in needle-valve chamber 15 acts in needle-valve pressure ring 12 and makes Needle shaft 11 start to move up under the effect of pressure difference.
When supercharging electric current increases to certain amplitude (supercharging upper current limit, for example 24A) time, MCU16 controls driver 19 built-up voltage is reduced to low voltage (in literary composition also referred to as " maintaining voltage "), the half (for example 24V) of for example built-up voltage, thereby coil current drops to and maintains electric current from supercharging electric current, for example 12A.Maintaining under electric current, armature 4 is remained on the top of the cavity that armature 4 is positioned at by the suction of coil 3, and release control hole 6 stays open, and Needle shaft 11 continues to rise.In the time that 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 continues to rise until its top is encountered the upper wall of control chamber 6 and remained there.After this oil sprayer keeps spray orifice 13 oil spouts from opening.
When maintaining described in stopping after voltage, oil sprayer armature 4 is taken a seat under the effect of dead weight and Returnning spring SC and SD.Because the ball valve 5 of moment armature 4 belows of taking a seat contacts with the open-topped rigidity in release control hole 7, armature 4 produces resilience, and this can produce a little counter current in electromagnetic valve coil.
As mentioned above, due to the sampling resistor R_sample in coil current sampling circuit 17 of the present invention and electromagnet coil 3 and sustained diode formation closed-loop path, this counter current sampling resistor R_sample that will flow through, therefore coil current sample circuit 17 can detect appearance and the amplitude size thereof of this counter current.As shown in the little current spike waveform on right side in Fig. 6 lower waveform figure.
In Fig. 6 lower waveform figure, left side waveform is the drive current waveform causing in response to applying of controlled voltage pulse in electromagnetic valve coil 3, and it is corresponding with the waveform in Figure 1B.Controlled voltage pulse from Fig. 6 (upper waveform in Fig. 6) relatively can be found out with drive current waveform, after controlled voltage pulse stops, after being applied to voltage on electromagnetic valve coil and being zero, electric current in electromagnetic valve coil declines rapidly, therefore the electromagnetic attraction of solenoid valve also declines rapidly, oil sprayer armature 4 is taken a seat under the effect of dead weight and Returnning spring SC and SD, and resilience produces counter current spike.Therefore, can be by the Time Calculation of taking a seat of oil sprayer armature 4 time between moment (bounce-back of taking a seat) of occurring of moment of stopping of controlled voltage pulse and counter current peak value.
Described above is in a conventional injection period of oil sprayer, the roughly working procedure of oil sprayer.Therefrom can find out, the opening time of oil sprayer roughly can be divided into two stages.First stage picks up the stage also referred to as armature, and it is from starting that electromagnetic valve coil is applied to controlled voltage pulse until oil sprayer armature is drawn onto the time at the top of the chamber at its place by electromagnetic valve coil.The endurance of this first stage is depended on 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 applying on electromagnetic valve coil etc.Therefore, this endurance first stage is easily subject to aging impact and drifts about.For example, along with oil sprayer is aging, the resistance of fuel injector magnetic system coil and inductance, the elasticity coefficient of Returnning spring, friction factor, and the voltage applying on electromagnetic valve coil all may change, thus affect the endurance of this first stage.Second stage is Needle shaft ascent stage, and it is to be drawn onto moment at top of the chamber at its place from oil sprayer armature by electromagnetic valve coil its top reaches control chamber top until Needle shaft is promoted to move by high pressure and time of opening spray orifice completely.Generally can think that the endurance of this second stage determines by the oil pressure in high pressure co-rail system and oil temperature, therefore, it is substantially with aging irrelevant.
On the basis of above understanding, the inventor finds armature to pick up endurance (in literary composition also referred to as " armature rise time ") in stage by test first progressively, and then adds the endurance of the needle-valve ascent stage calculating according to oil pressure and oil temperature (in literary composition also referred to as " Needle shaft rise time ") to endurance that this armature picks up the stage and obtain opening time of whole oil sprayer.
Particularly, the inventor recognizes, the built-up voltage pulse of endurance deficiency is being applied on electromagnetic valve coil in situation, for example, when armature is not also drawn onto the top of armature chamber, built-up voltage pulse just stops, and now the time of taking a seat of armature will be proportional to the endurance of the built-up voltage pulse applying.Fig. 7 illustrates so a kind of situation, being applied to when armature is not yet drawn onto the top of armature chamber (being armature place chamber) of built-up voltage just stops, and the height that therefore armature is lower has determined that its time of taking a seat will be less than taking a seat the time in conventional injection period.It may be noted that, after built-up voltage stops, due to the inductance characteristic of electromagnetic valve coil, its electric current can not disappear at once, also be that electromagnetic valve coil also will keep certain suction a period of time, and armature itself has certain speed upwards, therefore armature also by rise certain height until speed upwards drop to zero and start tenesmus.Certainly the height of this rising may be very little, because because the deadweight of armature itself is larger, is subject in addition the effect such as pulling force of oil liquid resistance and Returnning spring 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 applying is not enough to armature to be 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 higher, and its time of taking a seat will be larger.That is to say, the time of taking a seat of armature will be proportional to the endurance of the built-up voltage pulse applying in the case.When endurance of the built-up voltage applying is the top that just in time armature is drawn onto to armature chamber (height of the peak that armature reaches is just in time the top of armature chamber), the time of taking a seat now should be maximum.The endurance of built-up voltage is substantially equal to armature recited above and picks up the endurance in stage in the case.
If further slightly increase the endurance of the built-up voltage applying, armature bumps the very little initial velocity with certain and the top of armature chamber so again, and this collision diminishes the time of taking a seat that makes armature.
Therefore visible, by from being not enough to attract endurance of built-up voltage at the top that reaches armature chamber to start progressively to increase the endurance of built-up voltage in armature, and measure accordingly corresponding the taking a seat the time of each endurance, until the endurance of the built-up voltage applying is enough to make armature to bump with certain very little initial velocity and the top of armature chamber, can find that a local maximum value appears in the relation of the endurance of the time of taking a seat to built-up voltage.Those skilled in the art should understand that, as mentioned above, the local maximum of this time of taking a seat is just in time the endurance of the built-up voltage at the top (be also armature while reaching the top of armature chamber speed just in time drop to zero) of armature chamber corresponding to the height of the peak that armature is reached.
As mentioned above, the height rising after built-up voltage stops due to armature is very little, therefore, substantially can think the above-mentioned height that makes the peak that armature reaches be just in time the top of armature chamber (be also armature while reaching the top of armature chamber speed just in time drop to zero) built-up voltage endurance corresponding to, in real work, armature is drawn onto the time at the top of the chamber at its place by electromagnetic valve coil, is also the endurance that armature picks up the stage.
Determine for oil pressure and oil temperature, with aging variation very little Needle shaft rise time, can think that its motor for same batch or model is identical substantially.Therefore can measure like this: in the motor of batch or model, select at least one and installation position displacement sensor on each Needle shaft therein, in the controlled voltage pulse applying as shown in Figure 1A, can record Needle shaft trip map as shown in Figure 1 C, therefrom can record applying until the time that Needle shaft is opened completely from controlled voltage pulse.Can think that the time that this Needle shaft is opened is completely that above-mentioned armature picks up the time in stage and the time sum of Needle shaft ascent stage.
Therefore, complete this Needle shaft opening time is deducted to the armature recording and pick up the endurance in stage, just can obtain Needle shaft rise time.Can test the Needle shaft rise time of at least one the motor of selecting under different multiple oil temperatures and oil pressure, obtain substantially not Needle shaft rise time with aging variation of the relation to oil temperature and oil pressure, as the relation to oil temperature and oil pressure with Needle shaft rise time of aging variation not substantially of the motor of this batch or model, 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, likely after injector opening time is due to aging variation, carry out the scanning that the above-mentioned built-up voltage endurance increases continuously, find the endurance that picks up the stage due to the aging armature changing, and according to the oil pressure of work and oil temperature add be for example stored in the flash memory 22 of above-mentioned MCU 16 substantially not with the Needle shaft rise time of aging variation, obtain the injector opening time changing due to aging.Afterwards, can according to this more the injector opening time of " truly " injection advance angle and the power-up time to oil sprayer real work compensate, thereby even after injector opening time is due to aging variation, also can more accurately control fuel injection quantity.
The object lesson according to the method described above oil sprayer injection advance angle and power-up time being compensated below with reference to the flow chart of Fig. 8 and the diagram shows of Fig. 9 A and Fig. 9 B.Wherein, the flow chart of Fig. 8 illustrates the roughly step of the method that oil sprayer injection advance angle and power-up time are compensated that for example can be carried out by the MCU 16 in electronic control unit 2; The plotted curve of Fig. 9 A and Fig. 9 B illustrates respectively in said method in the endurance of finding the built-up voltage that armature progressively increases in picking up the process of endurance in stage scanning the drawing of number of times, and the corresponding time of taking a seat is to scanning the drawing of number of times.
Referring to Fig. 8, in step 800, MCU 16 (can be specifically the CPU20 in MCU 16) carries out initialization action, the endurance that counting variable n is set to the inferior built-up voltage pulse of initial value 1, the n (now n=1) is set to T (powering up) n=T (powering up)
initially.T (powering up)
initiallycan be for example 0, or can be the nonzero value setting in advance, the half or 1/3rd of for example, armature pick-up time while dispatching from the factory.
In step 801, CPU 20 sends order to TPU 23, instruction TPU 23 sends pulse control signal to driver 19, and built-up voltage (for example 48V) pulse (for example, voltage pulse shown in the top of Fig. 7) that is T (powering up) n by the endurance is applied to oil sprayer coil 3.
In step 802, measure built-up voltage apply end time be carved into the time between the moment that counter current peak value occurs, the endurance is armature corresponding to built-up voltage pulse of T (powering up) n time T (taking a seat) n that takes a seat.
In step 803, increase progressively counting variable n, and the endurance of the n time built-up voltage pulse is 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 through increasing 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, program is got back to step 801, and CPU 20 sends order to TPU 23, and instruction TPU23 sends pulse control signal to driver 19, and built-up voltage (for example 48V) pulse that is T (powering up) n by the endurance is applied to oil sprayer coil 3.Perform step afterwards the operations such as increasing progressively of 802 measurement and step 803, until again judge in step 804.
Otherwise, if determine that in the judgement of step 804 endurance of the n time built-up voltage pulse has reached scanning upper limit T (powering up)
the upper limit, EOP end of program scanning, and advance to step 805.In step 805, determine maximum of T (taking a seat) max in T (taking a seat) n of all measurements.Scanning upper limit T (powering up) above
the upper limitcan be estimate oil sprayer while scrapping possible armature pick up endurance in stage.
Afterwards, in step 806, will be defined as armature and pick up endurance in stage with the take a seat application time of built-up voltage corresponding to time T (taking a seat) max of determined maximum.
In step 807, the endurance that picks up the stage according to definite armature is determined current injector opening time, for example oil temperature and the oil pressure when according to real work, adds corresponding Needle shaft definite armature to and picks up endurance in stage rise time.
In step 808, according to determined current injector opening time, revise injection advance angle and power-up time in the oil spout control of electronic control unit 2 in the time of oil sprayer real work.Term " power-up time " in literary composition can be understood as the built-up voltage endurance and maintains voltage endurance sum.
Due to according to this more the injector opening time of " truly " injection advance angle and the power-up time to oil sprayer real work compensate, thereby even after injector opening time is due to aging variation, also can more accurately control fuel injection quantity.
Although the built-up voltage endurance changes in oil sprayer armature hunting zone rise time continuously with fixed increment in description above, but it will be understood by those skilled in the art that the built-up voltage endurance can change continuously with transformable increment completely in oil sprayer armature hunting zone rise time.
For example, in the time approaching oil sprayer armature rise time of estimating, the increment of built-up voltage endurance can diminish.The oil sprayer armature of this expectation can be the last oil sprayer armature rise time of measuring and storing rise time.
According to an embodiment of the invention, MCU 16 can regularly carry out measurement injector opening time automatically, and the program that compensates of injection advance angle to oil sprayer real work and power-up time.
According to another implementation of the invention, MCU 16 can carry out measurement injector opening time in response to external command, and the program that compensates of injection advance angle to oil sprayer real work and power-up time.
Although the present invention is described in conjunction with its concrete illustrative embodiments, easily see, multiple alternative, revise and distortion easily see for those skilled in the art.Thus, the illustrative embodiments of the present invention of illustrating at this is schematically and also non-limiting.Can modify without departing from the spirit and scope of the present invention.
The measure word " one ", " one " etc. that used in this disclosure are not got rid of plural number.Any reference character in claims all should not be construed as the restriction to scope.
Claims (9)
1. an injector opening time measuring equipment, comprising:
Control gear, for sending pressurization instruction, the built-up voltage endurance of controlled voltage pulse has been specified in described pressurization instruction;
Coil pressurization device, it receives the pressurization instruction of self-control device, and according to described pressurization instruction, controlled voltage pulse is applied to the coil of oil sprayer;
Current sensor device, the electric current on the coil of its measurement oil sprayer, and measurement current value is sent to described control gear;
Wherein said control gear is arranged to, send successively a series of pressurization instructions, the built-up voltage endurance of the controlled voltage pulse that the each pressurization instruction in described a series of pressurization instructions is specified changes continuously in the search oil sprayer armature process of rise time; By using described measurement current value to monitor the current-responsive waveform causing corresponding to the controlled voltage pulse of each pressurization instruction on the coil of oil sprayer, calculate oil sprayer armature corresponding to each pressurization instruction and take a seat the time; And take a seat after the calculating of time completing the transmission of described a series of pressurization instructions and corresponding a series of oil sprayer armature, determine the maximum value that described a series of oil sprayer armature was taken a seat in the time, and according to determining injector opening time with take a seat built-up voltage endurance of controlled voltage pulse corresponding to time of maximum oil sprayer armature.
2. according to the injector opening time measuring equipment of claim 1, wherein said current-responsive waveform comprises counter current pulse, wherein said control gear by the described built-up voltage endurance finish time be carved into time between the moment that peak value appears in described counter current pulse and be defined 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 controlled voltage pulse corresponding to time by relevant to oil temperature and oil pressure Needle shaft being added to rise time with maximum oil sprayer armature, determines injector opening time.
4. according to the injector opening time measuring equipment of claim 1, the built-up voltage endurance that the each pressurization instruction in wherein said a series of pressurization instructions is specified changes in the search oil sprayer armature process of rise time continuously with fixed increment.
5. according to the injector opening time measuring equipment of claim 1, the built-up voltage endurance that the each pressurization instruction in wherein said a series of pressurization instructions is specified changes in the search oil sprayer armature process of rise time continuously with transformable increment.
6. according to the injector opening time measuring equipment of claim 5, wherein said transformable increment is less near oil sprayer armature rise time of estimating.
7. comprise according to an oil sprayer for the injector opening time measuring equipment of claim 1, power-up time and injection advance angle when wherein said control gear is further used for according to definite injector opening time oil sprayer real work compensate.
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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| US10273923B2 (en) * | 2016-12-16 | 2019-04-30 | GM Global Technology Operations LLC | Systems and methods for controlling fluid injections |
| 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 |
| 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 |
| CN110206652B (en) * | 2019-06-29 | 2021-12-21 | 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 |
| 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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