CN202250526U - Oil injector with closing time deviation compensation function - Google Patents
Oil injector with closing time deviation compensation function Download PDFInfo
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- CN202250526U CN202250526U CN2011203363282U CN201120336328U CN202250526U CN 202250526 U CN202250526 U CN 202250526U CN 2011203363282 U CN2011203363282 U CN 2011203363282U CN 201120336328 U CN201120336328 U CN 201120336328U CN 202250526 U CN202250526 U CN 202250526U
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Abstract
The utility model relates to an oil injector with a closing time deviation compensation function. The oil injector comprises a control device, a coil pressurization device and a current sensing device, wherein the control device is used for sending out pressurization commands continuously, and each pressurization command designates the power-up time of a controlled tension impulse; the coil pressurization device is used for receiving the pressurization commands from the control device and exerting the controlled tension impulses on the electromagnetic valve coil of the oil injector according to the pressurization commands; the current sensing device is used for measuring the current on an electromagnetic valve coil of the oil injector and sending the measured current value to the control device; and the control device is further used for monitoring the wave shapes of current responses on the electromagnetic valve coil of the oil injector caused by the controlled tension impulses corresponding to the pressurization commands one to one by using the measured current value, so as to measure the seating time of each of oil injector armatures corresponding to the pressurization commands, and calculate the compensation dosage of the power-up time of the controlled tension impulse designated by next command according to the measured seating time of the oil injector armature corresponding to the current pressurization command.
Description
Technical field
The utility model is broadly directed to the field of oil sprayer, more specifically relates to a kind of oil sprayer with shut-in time deviation compensation.
Background technique
In the high pressure co-rail system, oil sprayer is a critical component wherein, and the accurate control of fuel injection quantity 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 of fuel injector magnetic system opening and closing.
Yet the definite time point of closing of fuel injector magnetic system is not equal to the time point that the fuel injector magnetic system driving current ends in reality, but certain hysteresis is arranged.
Referring to Figure 1A, shown in it when fuel injector magnetic system coil (also abbreviating " oil sprayer coil " in the literary composition as) driving current by after a period of time, armature is just taken a seat and is caused the counter current peak value.This time lag is called oil sprayer armature and takes a seat the time.This is that armature is in high-order open position because in the moment that the electromagnetic valve coil driving current ends, and it gets back to the low level closed position needs certain stroke, thereby can need the regular hour.The take a seat concrete amount of time of time of oil sprayer armature is relevant with the characteristic of solenoid valve.Wherein this characteristic is such as the elasticity coefficient that comprises Returnning spring, and the friction factor of armature and other parts etc.
In real work, after the long-time running of oil sprayer, above-mentioned characteristic is such as the elasticity coefficient of Returnning spring, and the friction factor of armature and other parts all can change.Thereby this can cause the response characteristic of fuel injector magnetic system, and particularly the oil sprayer armature time of taking a seat changes.Therefore, along with oil sprayer is aging, the oil sprayer armature amount of time of taking a seat can drift about.Shown in Figure 1B, after oil sprayer was aging, the oil sprayer armature time of taking a seat obviously increased with respect to Figure 1A.In the case,, certainly will influence the accurate control of fuel injection quantity, thereby influence the various performances of oil sprayer if fuel injection parameter is not revised.
Therefore, need a kind ofly can under instant situation about changing, also can accurately control the system and method for fuel injection quantity because of the armature time of taking a seat of reason oil sprayer reality such as wearing out.
The waveform that it may be noted that the driving current of above Figure 1A and Figure 1B has omitted a lot of details.For example, wherein omitted the transition of driving current when on the fuel injector magnetic system coil, applying voltage and stopping to apply voltage.
The model utility content
The mode of execution of the utility model provides can measure the take a seat equipment of time of actual oil sprayer armature, thus can be in real time to since the oil sprayer shut-in time former thereby that change such as aging compensate.
An aspect according to the utility model provides a kind of oil sprayer with shut-in time deviation compensation, comprising: control gear, be used for sending continuously the pressurization instruction, and the time that powers up of controlled voltage pulse has been specified in each pressurization; The coil pressurization device, it receives the pressurization instruction from control gear, and according to said pressurization instruction the controlled voltage pulse is applied to the fuel injector magnetic system coil; Current sensor device, it measures the electric current on fuel injector magnetic system coil, and will measure current value and send to said control gear; Wherein said control gear is further used for; 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 fuel injector magnetic system coil, measure the corresponding oil sprayer armature of each pressurization instruction and take a seat the time; And take a seat the time according to the corresponding oil sprayer armature of measured current pressurization instruction, calculate the compensation rate of the time that powers up of the said controlled voltage pulse of appointment in the next instruction.
Through oil sprayer,, also can make corresponding real-time correction, thereby can accurately control fuel injection quantity even change because of the shut-in time point of reason oil sprayer reality such as wearing out with shut-in time deviation compensation according to the utility model mode of execution.
Description of drawings
Come to describe in further detail the each side of the utility model referring now to the accompanying drawing of the current preferred implementation that the utility model is shown.
Figure 1A and 1B illustrate the schematic representation of the driving current of normal oil sprayer and aging oil sprayer to the curve of time respectively;
Fig. 2 illustrates the functional block diagram according to the oil sprayer with shut-in time deviation compensation of the utility model mode of execution;
Fig. 3 illustrates the structural drawing according to the basic physical unit of the oil sprayer of the utility model mode of execution;
Fig. 4 illustrates the functional part block diagram according to the electronic control unit of the oil sprayer of the utility model mode of execution (ECU);
Fig. 5 illustrates according to a mode of execution of the utility model, has realized a physical circuit of coil actuator and coil current sample circuit;
Fig. 6 illustrates in more detail according to coil actuator in the one-period of the oil sprayer work of a mode of execution of the utility model 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 is the flow chart that illustrates according to the working procedure of the oil sprayer with shut-in time deviation compensation of a mode of execution of the utility model;
Fig. 8 illustrates the oil temperature and the mapping MAP of rail pressure to the compensation rate that powers up the time according to a mode of execution of the utility model.
Embodiment
Describe oil sprayer with reference to the accompanying drawings in detail with shut-in time deviation compensation according to the utility model mode of execution.Identical reference character refers to components identical in institute's drawings attached.
Fig. 2 illustrates the functional block diagram according to the oil sprayer with shut-in time deviation compensation 200 of a mode of execution of the utility model.As shown in Figure 2, comprise control gear 201, coil pressurization device 202, and current sensor device 203 according to the oil sprayer with shut-in time deviation compensation 200 of the mode of execution of the utility model.Control gear 201 is used for sending continuously the pressurization instruction, and the time that powers up of controlled voltage pulse has been specified in each pressurization.Coil pressurization device 202 receives the pressurization instruction from control gear, and according to said pressurization instruction the controlled voltage pulse is applied to fuel injector magnetic system coil 3.Current sensor device 203 is measured the electric current on the fuel injector magnetic system coils 3, and will measure current value and send to control gear 201.Control gear 201 is further used for measuring the corresponding oil sprayer armature of each pressurization instruction and taking a seat the time through use to measure the current value monitoring corresponding to the current-responsive waveform that the controlled voltage pulse of each pressurization instruction causes on fuel injector magnetic system coil 3; And take a seat the time according to the corresponding oil sprayer armature of measured current pressurization instruction, calculate the compensation rate of the time that powers up of the said controlled voltage pulse of appointment in the next instruction.
A mode of execution according to the utility model; Said current-responsive waveform comprises the counter current pulse, wherein control gear 201 with said controlled voltage pulse apply end the time be carved into time between the moment that peak value appears in said counter current pulse and confirm as oil sprayer armature and take a seat the time.
According to a mode of execution of the utility model, oil sprayer armature is taken a seat time and power up the corresponding relation of the compensation rate of time under the different oily gentle rail pressure that control gear 201 is demarcated when dispatching from the factory, and calculates the compensation rate of the time of powering up.
According to a mode of execution of the utility model, control gear 201 is further used for, and the compensation rate of the time that powers up of use calculating and rail pressure warm with the oil of relevant oily gentle rail pressure updated stored is to the mapping MAP of the compensation rate that powers up the time.
A mode of execution according to the utility model; Control gear 201 is further used for; When not measuring oil sprayer armature when taking a seat the time, use the oil temperature and the mapping MAP of rail pressure of storage to the compensation rate that powers up the time, power up the compensation rate of time from current oil temperature and rail pressure calculating.
It will be understood by those skilled in the art that the control gear 201 among Fig. 2, coil pressurization device 202, and current sensor device 203 can be implemented by the one or more concrete parts in the oil sprayer 200.
Below in conjunction with the plotted curve of Fig. 6, and Fig. 3, Fig. 4 and Fig. 5 specify the concrete structure of oil sprayer 200 and the detailed process of work.Wherein Fig. 3 illustrates the basic physical arrangement 1 according to the oil sprayer 200 of the utility model mode of execution; Fig. 4 illustrates the functional part block diagram according to the electronic control unit (ECU) 2 of the oil sprayer 200 of the utility model mode of execution; Fig. 5 illustrates according to a mode of execution of the utility model, has realized a physical circuit of coil actuator and coil current sample circuit; Fig. 6 illustrates according to mode of execution of the utility model; In the one-period of the working procedure of the oil sprayer with shut-in time deviation compensation 200, be applied to the waveform of the controlled voltage on the fuel injector magnetic system coil 3; And comprise in the coil of counter current peak value waveform driving current over time, it is compared with Figure 1B with Figure 1A more details is shown.
As shown in Figure 3, the functional part of the basic physical arrangement 1 of the oil sprayer 200 that will be referred in below describing roughly comprises: the electromagnetic valve 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 a mode of execution of the utility model, the electronic control unit 2 of oil sprayer 200 is mainly implemented by microcontroller (MCU) 16 and each miscellaneous function unit.Fig. 3 only shows the part miscellaneous function unit that will be referred in the following description.As shown in Figure 3; 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 electromagnetic valve coil 3 of oil sprayer is sampled, and are used for the driver 19 that the electromagnetic valve coil 3 to oil sprayer drives.In a mode of execution of the utility model, driver 19 for example applies driving voltage through external lead wire WA and external lead wire WB to the electromagnetic valve 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 mode of execution of the utility model, flash memory 22 also can be positioned at outside the MCU 16.According to another mode of execution of the utility model, 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 and injection advance 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 electromagnetic valve 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 a mode of execution of the utility model, has realized a physical circuit of driver 19 and coil current sample circuit 17, has wherein also drawn electromagnetic valve coil 3.
As shown in Figure 5, according to a mode of execution of the utility model, 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 electromagnetic valve 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 electromagnetic valve 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 electromagnetic valve 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 electromagnetic valve coil 3 (because the resistance of sampling resistor R_sample is very little, can think basically that voltage mainly is applied on the electromagnetic valve 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 electromagnetic valve 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 electromagnetic valve coil 3; When highside_ctl_1 and highside_ctl_2 and lowside_ctl are low level, there is not voltage to be applied to electromagnetic valve coil 3.
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 electromagnetic valve 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 electromagnetic valve 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/D 18 (being shown in Fig. 4).
Sampling resistor R_sample that is connected in series and electromagnetic valve 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, electromagnetic valve coil 3 and sustained diode constitute.This point is crucial especially for the utility model.
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; Mode of execution according to the utility model; 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 oil sprayer 200 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, oil sprayer 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. 3) applied voltage for coil 3 through lead-in wire WA and lead-in wire WB.According to a mode of execution of the utility model, 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 upper half part waveform among Fig. 6.This built-up voltage acts on the supercharging electric current that generation is started from scratch cumulative on the coil 3, shown in lower half portion waveform among Fig. 6, 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 in the utility model in the coil current sample circuit 17 and electromagnetic valve 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 1A or Figure 1B, and more details still are shown.Controlled voltage pulse from Fig. 6 (upper waveform among Fig. 6) can be found out with the comparison of drive current waveform; After applying of 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.Therefore, can be the moment that stops of applying of controlled voltage pulse and the counter current peak value time between moment (bounce-back of taking a seat) of occurring with the Time Calculation of taking a seat of oil sprayer armature 4.
After oil sprayer armature 4 is taken a seat; It will discharge control hole 7 sealings; Thereby the pressure in the control chamber 6 is identical through the maintenance of the pressure in oil-filled control hole 10 and the needle-valve chamber 15, thereby Needle shaft 11 begins to take a seat downwards owing to the effect of Returnning spring, up to blocking spray orifice 13 once more.
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 shut-in time of oil sprayer roughly can be divided into two stages.Phase I is also referred to as armature and takes a seat the stage, and it is from stopping that electromagnetic valve coil is applied the controlled voltage pulse up to time that oil sprayer armature is taken a seat.The endurance of this phase I is depended on the elasticity coefficient of fuel injector magnetic system Returnning spring, friction factor of armature and other parts or the like.Therefore, this endurance phase I receives aging influence easily and drifts about.For example aging along with oil sprayer, the elasticity coefficient of fuel injector magnetic system Returnning spring, the friction factor of armature and other parts all possibly change, thereby influences the endurance of this phase I.Second stage is that Needle shaft is taken a seat the stage, and it is to take a seat and time of blocking spray orifice up to Needle shaft from moment that oil sprayer armature is taken a seat.
On the basis of above understanding; The utility model people takes a seat endurance (being also referred to as " armature is taken a seat the time " in the literary composition) in stage through measuring armature; Convert thereof into compensation rate then, fuel injection quantity is controlled to be the identical technique effect of new oil sprayer when dispatching from the factory to reach to the time that powers up of oil sprayer.
Obtaining the compensation rate of the time of powering up can calculate through the relation of demarcating in advance from the armature time of taking a seat of measuring.
For example, can in the oil sprayer of batch or model, select at least one and carry out aging test.For example; Can at first measure the initial fuel injection amount under a plurality of different operating modes (for example different oily gentle rail pressure); The armature of measuring under above-mentioned a plurality of different operating modes with aforesaid method after long period of one of every afterwards operation is taken a seat the time, and finds through test progressively and to make fuel injection quantity keep the identical time that powers up (perhaps powering up the compensation rate of time) of fuel injection quantity under the corresponding operating mode with initially the time under each operating mode.Thereby can obtain each operating mode lower armature in above-mentioned a plurality of operating mode take a seat time and the identical corresponding relation that powers up the time bias amount of fuel injection quantity that makes fuel injection quantity when initial.This corresponding relation can be stored in when dispatching from the factory in each oil sprayer of this batch or model, for example is stored in the flash memory 22 of above-mentioned MCU 16.
Thereby; Might be after the armature time of taking a seat changes owing to wearing out; The current-responsive waveform that the controlled voltage pulse of instructing corresponding to each pressurization through monitoring causes on the fuel injector magnetic system coil; Calculating the corresponding oil sprayer armature of each pressurization instruction takes a seat the time; Find owing to the aging oil sprayer armature that changes is taken a seat the time, and according to current working (for example rail pressure and oil temperature) and corresponding armature take a seat time and the identical corresponding relation that powers up the time bias amount of fuel injection quantity that makes fuel injection quantity when initial, convert to and make fuel injection quantity maintenance and the compensation rate of the initial phase time that powers up together.Even thereby after the oil sprayer shut-in time changes owing to wearing out, also can more accurately control fuel injection quantity.
Term in the literary composition " powers up the time " and is appreciated that to the built-up voltage endurance of controlled voltage pulse and keeps voltage endurance sum.
Below with reference to the flow chart description of figure 7 working procedure according to the oil sprayer with shut-in time deviation compensation 200 of the utility model mode of execution.
In step 700; When for example oil sprayer starts; MCU 16 (specifically can be the CPU 20 among the MCU 16) can send order and give TPU 23; Instruction TPU 23 sends pulse control signal to driver 19, and initial controlled voltage pulse (voltage pulse that for example has the voltage pulse waveforms shown in the top of Fig. 6) is applied to oil sprayer coil 3.
In step 701, CPU 20 measure the controlled voltage pulses apply end the time be carved into the time between the moment that the counter current peak value occurs, the corresponding armature of promptly current controlled voltage pulse is taken a seat the time.For example, CPU 20 can be through the coil current sample circuit 17 current-responsive waveform that 18 monitoring controlled voltage pulses cause on oil sprayer coil 3 with A/D, carries out the take a seat measurement of time of oil sprayer armature.
In step 702, whether CPU 20 can judge in the measurement of step 701 successful.For example, CPU 20 can judge whether to obtain the time value of taking a seat of oil sprayer armature in the reasonable scope.
If confirm that in step 702 measurement of step 701 is successful, then CPU 20 may be advanced to step 703.
In step 703, CPU 20 can take a seat the time according to the oil sprayer armature of measuring, and calculates and makes that fuel injection quantity keeps the power up time bias amount identical with the initial fuel injection amount under the current working (for example oily gentle rail pressure).For example; CPU 20 can be according to a plurality of different operating mode lower armatures of storage in the flash memory 22 of MCU 16 take a seat time and the identical corresponding relation that powers up the time bias amount of fuel injection quantity that makes fuel injection quantity with initially the time; Take a seat the time from the oil sprayer armature of current operating mode and measurement, calculate fuel injection quantity maintenance the power up time bias amount identical that make with the initial fuel injection amount.Then, CPU 20 advances to step 704.
In step 704, CPU 20 more fresh oil temperature and rail pressure to the mapping MAP of the compensation rate that powers up the time.This mapping MAP for example also can be stored in the flash memory 22 of MCU 16, and its reflected roughly that the oil sprayer that is in present ageing state should apply under current oil temperature and rail pressure to powering up the compensation rate of time.For example, CPU 20 can store the current time bias amount that powers up that calculates among this mapping MAP with rail pressure with current oil temperature relatedly.Fig. 8 roughly illustrates the three-dimensional drawing of a such mapping MAP.Wherein can be mapped to the compensation rate of the time of powering up from oil temperature (Fuel_T) and rail pressure (Rail_P).
It will be understood by those skilled in the art that the value that powers up the time bias amount among this mapping MAP all is zero,, does not need compensation that is when dispatching from the factory.CPU 20 can oil sprayer constantly wears out (the armature time of taking a seat constantly changes) and this mapping of continual renovation MAP along with oil sprayer moves.Then, CPU 20 advances to step 705.
In step 705, judge whether the work of oil sprayer continues.If oil sprayer is no longer worked, then CPU 20 quits work, and whole process finishes.
Otherwise; If judging the work of oil sprayer continues; Then CPU 20 advances to step 706; Issue instructions to TPU 23, instruction TPU 23 sends pulse control signal to driver 19, is applied to oil sprayer coil 3 with powering up the controlled voltage pulse that effluxion compensates (voltage pulse that for example has the voltage pulse waveforms shown in the top of Fig. 6).
Then, CPU 20 gets back to step 701, continues to measure oil sprayer armature and takes a seat the time.
If confirm that in step 702 measurement of step 701 is unsuccessful, then CPU 20 may be advanced to step 707.
In step 707, CPU 20 can be according to above-mentioned oil temperature (Fuel_T) and the mapping MAP of rail pressure (Rail_P) to the compensation rate that powers up the time, from current oil warm (Fuel_T) and rail pressure (Rail_P) calculate need the compensation rate of the time that powers up.
Owing to measure (successfully having measured) armature and take a seat the time at every turn, just can upgrade, so this mapping MAP has reflected nearest compensation situation oil temperature (Fuel_T) and rail pressure (Rail_P) MAP to the compensation rate that powers up the time.Thereby, successfully the armature time of taking a seat is not measured immediately, also can obtain newer nearest compensation rate, thereby can compensate powering up the time comparatively exactly.
Then, CPU 20 advances to step 705.In step 705, judge whether the work of oil sprayer continues.If oil sprayer is no longer worked, then CPU 20 quits work, and whole process finishes.
Otherwise; If judging the work of oil sprayer continues; Then CPU 20 advances to step 706; Issue instructions to TPU 23, instruction TPU 23 sends pulse control signal to driver 19, is applied to oil sprayer coil 3 with powering up the controlled voltage pulse that effluxion compensates (voltage pulse that for example has the voltage pulse waveforms shown in the top of Fig. 6).
Then, CPU 20 gets back to step 701, continues to measure oil sprayer armature and takes a seat the time.
Since according to this more the oil sprayer armature of " truly " time of taking a seat time that powers up of oil sprayer real work is compensated, thereby even after the oil sprayer shut-in time changes owing to wearing out, also can more accurately control fuel injection quantity.
Although the utility model 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, the illustrative embodiments at this utility model of illustrating is schematically and also non-limiting.Can under the situation of spirit that does not break away from the utility model and scope, 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 (5)
1. oil sprayer with shut-in time deviation compensation is characterized in that comprising:
Control gear is used for sending continuously the pressurization instruction, and the time that powers up of controlled voltage pulse has been specified in each pressurization;
The coil pressurization device is connected to said control gear, and it receives the pressurization instruction from control gear, and according to said pressurization instruction the controlled voltage pulse is applied to the fuel injector magnetic system coil;
Current sensor device is connected with control gear, and it measures the electric current on fuel injector magnetic system coil, and will measure current value and send to said control gear;
Wherein said control gear further is arranged to; 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 fuel injector magnetic system coil, measure the corresponding oil sprayer armature of each pressurization instruction and take a seat the time; And take a seat the time according to the corresponding oil sprayer armature of measured current pressurization instruction, calculate the compensation rate of the time that powers up of the said controlled voltage pulse of appointment in the next instruction.
2. according to the oil sprayer of claim 1; It is characterized in that; Said current-responsive waveform comprises the counter current pulse, wherein said control gear with said controlled voltage pulse apply end the time be carved into time between the moment that peak value appears in said counter current pulse and confirm as oil sprayer armature and take a seat the time.
3. according to the oil sprayer of claim 1, it is characterized in that oil sprayer armature is taken a seat time and power up the corresponding relation of the compensation rate of time under the different oily gentle rail pressure that said control gear is configured to demarcate when dispatching from the factory, and calculates the compensation rate of the time of powering up.
4. according to the oil sprayer of claim 1, it is characterized in that said control gear further is configured to use the oil temperature and the mapping of rail pressure to the compensation rate that powers up the time of compensation rate and relevant oily gentle rail pressure updated stored of the time that powers up of calculating.
5. according to the oil sprayer of claim 4; Wherein said control gear further is arranged to when not measuring oil sprayer armature when taking a seat the time; Use the oil temperature and the mapping of rail pressure of storage, calculate the compensation rate of the time that powers up from current oil temperature and rail pressure to the compensation rate that powers up the time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203363282U CN202250526U (en) | 2011-08-30 | 2011-08-30 | Oil injector with closing time deviation compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203363282U CN202250526U (en) | 2011-08-30 | 2011-08-30 | Oil injector with closing time deviation compensation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202250526U true CN202250526U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203363282U Withdrawn - After Issue CN202250526U (en) | 2011-08-30 | 2011-08-30 | Oil injector with closing time deviation compensation function |
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| Country | Link |
|---|---|
| CN (1) | CN202250526U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297065A (en) * | 2011-08-30 | 2011-12-28 | 潍柴动力股份有限公司 | Oil sprayer with closing time deviation compensation |
| CN103696864A (en) * | 2013-12-06 | 2014-04-02 | 潍柴动力股份有限公司 | Control method and device for high-pressure common rail system |
-
2011
- 2011-08-30 CN CN2011203363282U patent/CN202250526U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297065A (en) * | 2011-08-30 | 2011-12-28 | 潍柴动力股份有限公司 | Oil sprayer with closing time deviation compensation |
| CN103696864A (en) * | 2013-12-06 | 2014-04-02 | 潍柴动力股份有限公司 | Control method and device for high-pressure common rail system |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20120530 Effective date of abandoning: 20130417 |
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