CN101477870B - Generation method and apparatus for electromagnetic valve driving current - Google Patents
Generation method and apparatus for electromagnetic valve driving current Download PDFInfo
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- CN101477870B CN101477870B CN2008102234003A CN200810223400A CN101477870B CN 101477870 B CN101477870 B CN 101477870B CN 2008102234003 A CN2008102234003 A CN 2008102234003A CN 200810223400 A CN200810223400 A CN 200810223400A CN 101477870 B CN101477870 B CN 101477870B
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Abstract
The invention discloses a generation method and a device for a solenoid pilot actuated valve drive current, and is applicable to a fuel injection system of an engine. The method has the following steps: a high-end drive circuit is connected with one end of a solenoid pilot actuated valve via a sampling resistor; a low-end drive circuit is connected with the other end of the solenoid pilot actuated valve; an electronic control unit sends a summit current holding control pulse signal A11 and a current feedback control pulse signal AF to a signal processing circuit, and a low-end drive circuit control pulse signal B to the low-end drive circuit; and the signal processing circuit compares the solenoid pilot actuated valve drive current fed back by the sampling resistor with a current corresponding to a reference voltage, and sends a control signal C to the high-end drive circuit. By adopting the technical scheme, the method and the device of the invention have the advantages of short opening time of the solenoid pilot actuated valve, simple and reliable hardware current feedback control circuits, high regulating frequencies, good anti-interference effect in use, low price and the total production cost.
Description
Technical field
The present invention relates to electric-control motor fuel oil spraying technique field, relate in particular to a kind of production method and device of electromagnetic valve driving current.
Background technology
In the electric-control motor fuel injection system, the opening and closing of electromagnetically operated valve action there is very strict requirement, because opening and closing and the drive current of electromagnetically operated valve have confidential relation, so need move with the realization electromagnetically operated valve through accurate controlling and driving electric current.
Fig. 1 is an electromagnetic valve driving current waveform sketch map.As shown in Figure 1; In engine electromagnet by-pass valve control technology, drive current generally requires shape two-part drive current as shown in Figure 1, and T1 refers to the current boost stage; The T2 current peak keeps the stage; The T3 low current keeps the stage, and electromagnetically operated valve is accomplished closed action at T1 and T2 in the time period, keeps closure state in the time period until end at T3.
For obtaining the drive current of the type; Some drive circuits have been developed; Like traditional high low side Drive Structure: the shared cover high-end drive circuit of each electromagnetically operated valve, comprise a high-side driver power supply and a high-end pliotron, the high-side driver power supply often adopts Vehicular accumulator cell voltage 24V; Each electromagnetically operated valve respectively has a cover low-side driver circuitry, and the main devices of every cover low-side driver circuitry is a low side pliotron.For detecting drive current, usually a sampling resistor is set simultaneously at each electromagnetically operated valve low side.During work,, realize selecting the cylinder action through gating low side pliotron through changing the duty ratio adjustment drive current size of high-end pliotron control impuls.
This driving circuit structure is simple; But its shortcoming is also apparent in view: at first, the opening time is longer, because 24V driving power voltage can't provide enough energy at short notice; Cause drive current to rise slowly, be not enough to produce at short notice enough electromagnetic forces.If the simple mode that improves driving power voltage that adopts reduces the electromagnetically operated valve unlatching time, will increase power supply energy consumption greatly, and cause the electromagnetic valve coil heating, influence its working life, therefore generally be not used.If it is high-end that the timesharing of employing two-way driving power acts on electromagnetically operated valve, need two cover pliotron and two path control signal, the drive circuit cost is higher.
Secondly, low to the drive current control precision.For the size of drive current is adjusted to comparatively desired shapes, need drive current is adopted the current closed-loop FEEDBACK CONTROL.The tradition driving circuit for electromagnetic valve is generally realized current closed-loop control, i.e. software current closed-loop and hardware current closed-loop with dual mode.In software current closed-loop mode; To sampling, the comparison of drive current and adjust control action such as high-end pliotron control impuls duty ratio and all must rely on digital system to accomplish; Writing of its Control Software is comparatively complicated; And take more digital system resource, receive the restriction of digital control chip self operating frequency very low simultaneously, generally be no more than 10KHz adjusting frequency of duty ratio.Cross low FEEDBACK CONTROL frequency and must cause the current fluctuation amplitude bigger, control precision reduces.The hardware current closed-loop is to rely on peripheral auxiliary circuits to realize current sample, comparison, adjusts high-end pliotron control impuls duty ratio automatically.This mode reduces the dependence to digital system, if but the auxiliary circuit integrated level is low, and feedback circuit worsens with components and parts ageing of performance control precision in the long-term back of using, and too much additional device causes the circuit production cost to increase.
Once more, electromagnetically operated valve afterflow mode is single.In the different phase of electromagnetically operated valve work the afterflow mode there is different requirement; For example at close stage T2 and T3; Require drive circuit strong to electric current afterflow ability, steady to guarantee current fluctuation, and when electromagnetically operated valve breaks off; Do not need afterflow, require drive circuit to absorb the induced current that produces when electromagnetically operated valve breaks off rapidly.The traditional driving structure generally at the electromagnetically operated valve two ends or low side pliotron emitter be connected a fly-wheel diode between electromagnetically operated valve is high-end; Both are strong in solenoid closure stage afterflow ability, and the former afterflow ability is constant when breaking off, and causes drive current to descend slowly; Electromagnetically operated valve does not break off rapidly; The latter is closed the back at the low side pliotron and cuts off continuous current circuit, and induced current is released nowhere, causes the low side pliotron easily damaged.
Moreover reliability is not strong.Sampling resistor is often between low side pliotron emitter and power supply ground in traditional driving circuit for electromagnetic valve; This connected mode can't effectively suppress the interference on the power ground; And sampled voltage is generally less than 1V; So cause sampled voltage to receive interference effect comparatively obvious, control reliability a little less than.In sum, the conventional ADS driving circuit all needs to improve on driving force, control precision and reliability.
Summary of the invention
The objective of the invention is to propose a kind of production method and device of electromagnetic valve driving current, can shorten electromagnetically operated valve and open the time, hardware Current Feedback Control circuit is simple and reliable; Regulating frequency is high, and anti-interference effective in the use, the required control signal of drive circuit is comparatively simple; Reduce the digital system resource consumption, reduce the software development difficulty, the used component number of drive circuit is few; And cheap, the production cost is low.
For reaching this purpose, the present invention adopts following technical scheme:
A kind of production method of electromagnetic valve driving current is applicable to engine fuel injection system, may further comprise the steps:
A, said engine electronic control unit send peak current retentive control pulse signal A to signal processing circuit
HWith Current Feedback Control pulse signal A
F, and to low-side driver circuitry transmission low-side driver circuitry control wave B;
B, said peak current retentive control pulse signal A
HWith Current Feedback Control pulse signal A
FThrough becoming level after the conversion of the photoelectrical coupler in the said signal processing circuit is U
HControl signal A
H /With level be U
LControl signal A
L /, U wherein
HGreater than U
L
It is U that the reference voltage input terminal of the control module in C, the said signal processing circuit obtains level
HControl signal A
H /, level U
HDecision peak drive current I
H
D, when said electromagnetic valve driving current less than said peak drive current I
HThe time, said signal processing circuit is to the control signal C of high-end drive circuit transmission high level, and high-end pliotron M opens;
E, low-side driver circuitry control wave B open low side pliotron G, and said driving circuit for electromagnetic valve L connects, and the high drive power supply promotes said electromagnetic valve driving current;
F, be elevated to greater than said peak drive current I when said electromagnetic valve driving current
HAfter, said signal processing circuit is sent low level control signal C to high-end drive circuit, and high-end pliotron M closes, and said electromagnetic valve driving current descends;
G, drop to less than said peak drive current I when said electromagnetic valve driving current
HAfter, repeating step D is to step G, up to said peak current retentive control pulse signal A
HFinish;
H, as said peak current retentive control pulse signal A
HFinish, it is U that the reference voltage input terminal of the control module in the said signal processing circuit obtains level
LControl signal A
L /, level U
LKeep drive current I
L
I, when said electromagnetic valve driving current greater than the said drive current I that keeps
LThe time, said signal processing circuit is sent low level control signal C to high-end drive circuit, and high-end pliotron M closes, and said electromagnetic valve driving current descends;
J, drop to less than the said drive current I that keeps when said electromagnetic valve driving current
LAfter, said signal processing circuit is to the control signal C of high-end drive circuit transmission high level, and high-end pliotron M opens, and said electromagnetic valve driving current rises;
K, when said electromagnetic valve driving current greater than the said drive current I that keeps
LAfter, repeating step I is to step K, up to said Current Feedback Control pulse signal A
FFinish;
L, as said Current Feedback Control pulse signal A
FFinish, said signal processing circuit is sent low level control signal C to high-end drive circuit, and high-end pliotron M closes;
M, said low-side driver circuitry control wave B finish, and low side pliotron G closes, and said electromagnetic valve driving current drops to zero.
Said peak drive current I
HWith the said drive current I that keeps
LBe to preestablish according to said electromagnetically operated valve type, said electromagnetically operated valve unlatching time, adhesive electromagnetic force.
The quantity of said low-side driver circuitry equals said electromagnetically operated valve quantity, corresponding one tunnel low-side driver circuitry control wave B of each low-side driver circuitry, and sequential is confirmed by engine firing order.
Said peak current retentive control pulse signal A
HWith said Current Feedback Control pulse signal A
FThe rising edge effect constantly identical, said peak current retentive control pulse signal A
HBe shorter than said Current Feedback Control pulse signal A action time
FAction time, said Current Feedback Control pulse signal A
FWaveform is consistent with the waveform of whole said low-side driver circuitry control wave B.
If said electromagnetic valve driving current is greater than the reference voltage current corresponding of the reference voltage input terminal acquisition of said control module; The result of the comparator in the said control module is low; Said result is by the flip/flops latch in the said control module; Said trigger is output as low, and said signal processing circuit is sent low level control signal C to high-end drive circuit; If said electromagnetic valve driving current is less than the reference voltage current corresponding of the reference voltage input terminal acquisition of said control module; The result of the comparator in the said control module is high; Said result is by the flip/flops latch in the said control module; Said trigger is output as height, and said signal processing circuit is sent the control signal C of high level to high-end drive circuit.
Each clock cycle, the comparator in the said control module compares the reference voltage current corresponding of the reference voltage input terminal acquisition of said electromagnetic valve driving current and said control module, and the effect of latching of said trigger continues a clock cycle.
A kind of generation device of electromagnetic valve driving current; Be applicable to engine fuel injection system; Comprise electronic control unit, signal processing circuit, high-end drive circuit, low-side driver circuitry and sampling resistor; Said high-end drive circuit is connected with said electromagnetically operated valve one end through said sampling resistor, and said low-side driver circuitry is connected the other end of said electromagnetically operated valve, and said electronic control unit is used for sending peak current retentive control pulse signal A to signal processing circuit
HWith Current Feedback Control pulse signal A
FAnd to low-side driver circuitry transmission low-side driver circuitry control wave B; Said signal processing circuit is used for the electromagnetic valve driving current and the reference voltage current corresponding of said sampling resistor feedback are compared, and to the said high-end drive circuit C that transmits control signal.
Said high-end drive circuit comprises high voltage source, battery feed, diode and high-end pliotron; Said high voltage source, battery feed are isolated through said diode; And be connected with said high-end pliotron source S end; The grid G end of said high-end pliotron connects said signal processing circuit, is used to receive said control signal, and said sampling resistor is connected with the drain D end of said high-end pliotron.
Said low-side driver circuitry comprises low side pliotron and fly-wheel diode; The quantity of said low side pliotron equals the quantity of said electromagnetically operated valve; The grid G end of said low side pliotron is used to receive low-side driver circuitry control wave B; The source S end is connected with the positive pole of said fly-wheel diode, and the negative pole of drain D end and said fly-wheel diode is connected with an end of said sampling resistor.
Said signal processing circuit comprises control module, photoelectrical coupler and voltage-stabiliser tube; Said control module is used for the electromagnetic valve driving current and the reference voltage current corresponding of more said sampling resistor feedback and the C that transmits control signal, and said photoelectrical coupler is used for said peak current retentive control pulse signal A
HWith Current Feedback Control pulse signal A
FConverting level to is U
HControl signal A
H /With level be U
LControl signal A
L /And sending to said control module, said voltage-stabiliser tube is used to control the voltage of said control signal.
Adopted technical scheme of the present invention, shortened electromagnetically operated valve and opened and the shut-in time.Drive circuit has realized that under the prerequisite of only using a pliotron duplicate supply timesharing drives, and plays the high drive power supply at 100V, can to electromagnetically operated valve enough energy be provided at short notice, improves drive current rapidly, accomplishes the unlatching of electromagnetically operated valve.
Improved the Current Control precision.Drive circuit has been realized the hardware Current Feedback Control; PWM pulse-width signal to sampling, amplification, comparison and the high-end pliotron of drive current is all accomplished by hardware automatically; Do not need the digital system intervention; Higher 50～the 70KHz that reaches that adjusts frequency reduces the fluctuation range of drive current.And required hardware is merely a control chip and several resistance, and the component aging influence degree that receives simple in structure is little, so circuit can keep higher Current Control precision for a long time.
Control Software is simple.The required input control signal of this control circuit is very simple, only needs two sections high level pulses inputs, and the PWM pulse-width modulation no longer need be carried out in the centre, greatly reduces the complexity of Control Software.
Improved the drive circuit reliability.Sampling resistor in the drive circuit be serially connected in the high-end pliotron emitter of drive circuit and electromagnetically operated valve high-end between; The current feedback signal of being introduced is a differential signal; But better inhibited common mode disturbances; To the interference on the power ground and insensitive, anti-interference respond well in practical application.
Reduced production cost.Pliotron of the high-end only needs of drive circuit, the hardware current feedback need not extra comparator and trigger, utilize a control chip to realize, so the circuit production cost is comparatively cheap.
Description of drawings
Fig. 1 is an electromagnetic valve driving current waveform sketch map;
Fig. 2 is a driving circuit for electromagnetic valve principle schematic in the specific embodiment of the invention;
Fig. 3 is the signal processing circuit principle schematic among Fig. 2;
Fig. 4 is a part signal sketch map in the electromagnetic valve driving current production process in the specific embodiment of the invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and through embodiment.
The main thought of technical scheme of the present invention is the generation device that is applicable to the electromagnetic valve driving current of engine fuel injection system; Comprise electronic control unit, signal processing circuit, high-end drive circuit, low-side driver circuitry and sampling resistor; High-end drive circuit is connected with electromagnetically operated valve one end through sampling resistor; Low-side driver circuitry is connected the other end of electromagnetically operated valve, and electronic control unit sends peak current retentive control pulse signal A to signal processing circuit
HWith Current Feedback Control pulse signal A
FAnd to low-side driver circuitry transmission low-side driver circuitry control wave B, when drive current was flowed through sampling resistor, the voltage at resistance two ends was current feedback sampled values; Sampled value is the voltage at sampling resistor two ends, and the current feedback sampled value is to be obtained by sampling resistor.Signal processing circuit compares the electromagnetic valve driving current and the reference voltage current corresponding of sampling resistor feedback, and to the high-end drive circuit C that transmits control signal.
Wherein high-end drive circuit comprises high voltage source, battery feed, diode and high-end pliotron; High voltage source, battery feed are isolated through diode; And be connected with high-end pliotron source S end; The grid G end of high-end pliotron connects signal processing circuit, receives said control signal, and sampling resistor is connected with the drain D end of high-end pliotron.
Low-side driver circuitry comprises low side pliotron and fly-wheel diode; The quantity of low side pliotron equals the quantity of electromagnetically operated valve; The grid G termination of low side pliotron is received low-side driver circuitry control wave B; The source S end is connected with the positive pole of fly-wheel diode, and the negative pole of drain D end and fly-wheel diode is connected with an end of sampling resistor.
Signal processing circuit comprises control module, photoelectrical coupler and voltage-stabiliser tube, the electromagnetic valve driving current and the reference voltage current corresponding of control module comparison sampling resistor feedback and the C that transmits control signal, and photoelectrical coupler is with peak current retentive control pulse signal A
HWith Current Feedback Control pulse signal A
FConverting level to is U
HControl signal A
H /With level be U
LControl signal A
L /And send to control module, and the voltage that voltage-stabiliser tube is used to control said control signal is no more than 5V, and the chip used input signal that requires is lower than 5V.
Be applicable to the production method of the electromagnetic valve driving current of engine fuel injection system, may further comprise the steps:
A, engine electronic control unit send peak current retentive control pulse signal A to signal processing circuit
HWith Current Feedback Control pulse signal A
F, and to low-side driver circuitry transmission low-side driver circuitry control wave B;
Peak current retentive control pulse signal A
HWith Current Feedback Control pulse signal A
FThe rising edge effect constantly identical, peak current retentive control pulse signal A
HBe shorter than Current Feedback Control pulse signal A action time
FAction time, Current Feedback Control pulse signal A
FWaveform is consistent with the waveform of whole low-side driver circuitry control wave B.
B, peak current retentive control pulse signal A
HWith Current Feedback Control pulse signal A
FThrough becoming level after the conversion of the photoelectrical coupler in the signal processing circuit is U
HControl signal A
H /With level be U
LControl signal A
L /, U wherein
HGreater than U
H
It is U that the reference voltage input terminal of the control module in C, the signal processing circuit obtains level
HControl signal A
H /, level U
HDecision peak drive current I
H
D, when electromagnetic valve driving current less than peak drive current I
HThe time, signal processing circuit is to the control signal C of high-end drive circuit transmission high level, and high-end pliotron M opens;
E, low-side driver circuitry control wave B open low side pliotron G, and driving circuit for electromagnetic valve L connects, and the high drive power supply promotes electromagnetic valve driving current;
F, be elevated to greater than peak drive current I when electromagnetic valve driving current
HAfter, signal processing circuit is sent low level control signal C to high-end drive circuit, and high-end pliotron M closes, and electromagnetic valve driving current descends;
G, drop to less than peak drive current I when electromagnetic valve driving current
HAfter, repeating step D is to step G, up to peak current retentive control pulse signal A
HFinish;
H, as peak current retentive control pulse signal A
HFinish, it is U that the reference voltage input terminal of the control module in the signal processing circuit obtains level
LControl signal A
L /, level U
LKeep drive current I
L
I, when electromagnetic valve driving current greater than keeping drive current I
LThe time, signal processing circuit is sent low level control signal C to high-end drive circuit, and high-end pliotron M closes, and electromagnetic valve driving current descends;
J, drop to less than keeping drive current I when electromagnetic valve driving current
LAfter, signal processing circuit is to the control signal C of high-end drive circuit transmission high level, and high-end pliotron M opens, and electromagnetic valve driving current rises;
K, when electromagnetic valve driving current greater than keeping drive current I
LAfter, repeating step I is to step K, up to Current Feedback Control pulse signal A
FFinish;
L, as Current Feedback Control pulse signal A
FFinish, signal processing circuit is sent low level control signal C to high-end drive circuit, and high-end pliotron M closes;
M, low-side driver circuitry control wave B finish, and low side pliotron G closes, and electromagnetic valve driving current drops to zero.
Peak drive current I wherein
HWith keep drive current I
LBe to preestablish according to electromagnetically operated valve type, electromagnetically operated valve unlatching time, adhesive electromagnetic force.
The quantity of low-side driver circuitry equals electromagnetically operated valve quantity, corresponding one tunnel low-side driver circuitry control wave B of each low-side driver circuitry, and sequential is confirmed by engine firing order.
Wherein, If electromagnetic valve driving current is greater than the reference voltage current corresponding of the reference voltage input terminal acquisition of control module; The result of the comparator in the control module is low; Flip/flops latch in the Be Controlled module as a result, trigger is output as low, and signal processing circuit is sent low level control signal C to high-end drive circuit; If electromagnetic valve driving current is less than the reference voltage current corresponding of the reference voltage input terminal acquisition of control module; The result of the comparator in the control module is high; Flip/flops latch in the Be Controlled module as a result; Trigger is output as height, and signal processing circuit is sent the control signal C of high level to high-end drive circuit.
Each clock cycle, the comparator in the control module compares the reference voltage current corresponding of the reference voltage input terminal acquisition of electromagnetic valve driving current and control module, and the effect of latching of trigger continues a clock cycle.
Fig. 2 is a driving circuit for electromagnetic valve principle schematic in the specific embodiment of the invention.As shown in Figure 2, the driving circuit for electromagnetic valve that is used to produce the Electromagnetic Drive electric current comprises high-end drive circuit, low-side driver circuitry and signal processing circuit, electronic control unit (ECU) four parts.To drive four-way solenoid valve is example, and high-end drive circuit is positioned at electromagnetically operated valve L1～L4 one end, comprises driving power and pliotron; Driving power is provided by 100V high drive power supply and the timesharing of 24V Vehicular accumulator cell power supply; The minimum 24V that reduces to behind the 100V electrion isolates thereby need not to add in addition metal-oxide-semiconductor, adopts diode D2 (BYV28A) to realize isolating between two driving powers; High-end pliotron M is by the control signal C control of signal processing circuit output.
Between the emitter of high-end pliotron and common port that each electromagnetically operated valve is connected, be provided with sampling resistor RS.
Low-side driver circuitry is positioned at electromagnetically operated valve L1～L4 other end; Comprise four pliotron G1～G4 (VS3034D); Its number should equal the engine electromagnetic valve number, and these pliotrons are connected respectively to each electromagnetically operated valve, and its control signal B1～B4 is directly sent by engine electronic control unit; All be one section high level pulse, sequential is determined by engine firing order
Fig. 3 is the signal processing circuit principle schematic among Fig. 2.As shown in Figure 3, signal processing circuit comprises two photoelectrical couplers (TLP521-2), a voltage-stabiliser tube (1N4733A), control chip UC3844, diode and part resistance capacitance.
As shown in Figure 2, the input control signal of signal processing circuit is peak current retentive control pulse signal A
HWith Current Feedback Control pulse signal A
FTwo pulse signal rising edge effects are constantly identical, just peak current retentive control pulse signal A
HThan Current Feedback Control pulse signal A
FWill lack action time.Current Feedback Control signal A wherein
FIts waveform and low-side driver circuitry control wave B1～B4 are in full accord, are all sent by engine electronic control unit (ECU).
The control signal C of signal processing circuit output is one section pwm control signal, changes the make-and-break time of high-end pliotron, thereby regulates electromagnetic valve driving current.In this hardware Current Feedback Control circuit; Control chip UC3844 is responsible for the sampling of current feedback signal and amplifies in inside; Comparator through built-in chip type is delivered to trigger in the chip as input with the comparative result of feedback voltage and reference voltage; Along with the difference of comparative result, trigger will produce pwm control signal under the triggering of control chip UC3844 clock signal.The peak current retentive control pulse signal A that engine electronic control unit sends
HWith Current Feedback Control pulse signal A
F, behind photoelectrical coupler, being transformed into level is U
HControl signal A
H /With level be U
LControl signal A
L /, the control signal after the conversion acts on the reference voltage input terminal of control chip UC3844 simultaneously.Because control signal A
H /With control signal A
L /Action time different, so reference voltage input terminal obtains two kinds of height with reference to voltage, wherein, high level U
HEqual peak current I
HVoltage after the sampling resistor conversion, low level U
LEqual to keep electric current I
LVoltage after the sampling resistor conversion.
Be example to drive the first cylinder electromagnetically operated valve below, the course of work of this drive circuit be described:
Fig. 4 is a part signal sketch map in the electromagnetic valve driving current production process in the specific embodiment of the invention.As shown in Figure 4, at first, after definite electromagnetically operated valve type, open requirements such as time, adhesive electromagnetic force size according to electromagnetically operated valve and match the Control Parameter I in the typical drive current waveform as shown in Figure 4
H, I
L, T1 and T2, and Control Parameter T3 should be adjusted according to engine operating condition by engine electronic control unit (ECU) in real time.
t
1With t
2Between for the current boost stage be T
1, t
2With t
3Between for the peak current maintenance stage be T2, t
3With t
5Between be that low current keeps stage T3.
At t
1Constantly, engine electronic control unit (ECU) sends peak current retentive control pulse signal A
H, Current Feedback Control pulse signal A
FWith low-side driver circuitry control wave B
1, wherein, signal A
HAnd B
1High level is calculated according to engine operating condition by the engine management program action time, peak current retentive control pulse signal A
HRelevant with the electromagnetically operated valve operating characteristic, this parameter is generally normal value in the engine management program.t
1Constantly, control signal A
HAnd A
F, after the photoelectrical coupler conversion, becoming level is U
HControl signal A
H /With level be U
LControl signal A
L /, because U
H＞U
L, so the reference voltage input terminal of control chip UC3844 obtains peak drive current I
HThe corresponding reference voltage U
HAnd this moment, drive current did not reach the corresponding peak current of this reference voltage; So the result of control chip UC3844 internal comparator is high; This result device that is triggered latchs and makes trigger be output as height; Promptly this moment, high-end drive circuit control signal C was a high level, and high-end power tube M is in open mode all the time.Simultaneously, pulse signal B
1Also will open the pliotron G of low side
1High and low end power tube is opened simultaneously and is made driving circuit for electromagnetic valve L
1Connect high drive power supply fast lifting electromagnetically operated valve L
1Drive current, produce powerful electromagnetic attraction, electromagnetically operated valve is opened rapidly.
t
2Constantly, drive current reaches the peak current I of setting
H, the feedback voltage signal of drive current will be higher than reference voltage U
H, control chip internal comparator result is low, trigger also output low level after clock signal triggers.Therefore will close high-end power tube M, make electromagnetically operated valve L
1Can't obtain energy, drive current begins to descend.The internal comparator result will open high-end power tube M again for high after dropping to below the reference voltage, promote the electromagnetically operated valve L that flows through once more
1Drive current.Because the effect of latching of trigger, this process will continue a clock cycle, make drive current surpass I again
H, high-end drive circuit is no longer worked, and electric current begins again to descend.Subsequently, because the decline of electric current causes high-end drive circuit task again, drive current rises again.So repeatedly, form the situation that high-end drive circuit is interrupted work, make drive current fluctuate within the specific limits.This moment, high-end drive circuit control signal C was the PWM pulse-width signal that a high-low level replaces.
Generally, the high drive power supply energy is limited, maybe be just in the T1 active section approach exhaustion reduce to 24V.Should pass through rational Match high drive power supply, make high voltage source before declining to a great extent, drive current directly is promoted to I
HBe that optimal situation is at t
2The high drive power supply energy exhausts constantly.
Work as t
3Constantly, peak current retentive control pulse signal A
HFinish, reference voltage becomes U
LThe reduction of reference voltage makes that in the short time, feedback voltage signal is higher than reference voltage, so high-end drive circuit will no longer work, and drive current descends.
t
4Constantly, under drive current, be reduced to I
LAfter, feedback voltage signal is lower than reference voltage U
L, high-end power tube M is opened with the lifting drive current, thereby makes power tube M get into the PWM stage of modulating once more, and drive current will maintain I this moment
LAbout, and in certain scope, fluctuate.
At t
5Constantly, Current Feedback Control pulse signal A
FFinish, high-end drive circuit control signal C is a low level, closes high-end power tube M, finishes pulse signal B simultaneously
1, close the pliotron G of low side
1Because continuous current circuit is cut off; Therefore the induced voltage on the electromagnetic valve coil can't be released through sustained diode 1; But the low side pliotron can directly absorb the energy of 1J, so the energy major part of induced voltage is absorbed on the coil, drive current is able to rapid decline.
t
6Constantly, electromagnetically operated valve L
1Middle drive current drops to zero, and whole driving process finishes.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. the production method of an electromagnetic valve driving current is applicable to engine fuel injection system, it is characterized in that, may further comprise the steps:
A, said engine electronic control unit send peak current retentive control pulse signal A to signal processing circuit
HWith Current Feedback Control pulse signal A
F, and to low-side driver circuitry transmission low-side driver circuitry control wave B;
B, said peak current retentive control pulse signal A
HWith Current Feedback Control pulse signal A
FThrough becoming level after the conversion of the photoelectrical coupler in the said signal processing circuit is U
HControl signal A
H /With level be U
LControl signal A
L /, U wherein
HGreater than U
L
It is U that the reference voltage input terminal of the control module in C, the said signal processing circuit obtains level
HControl signal A
H /, level U
HDecision peak drive current I
H
D, when said electromagnetic valve driving current less than said peak drive current I
HThe time, said signal processing circuit is to the control signal C of high-end drive circuit transmission high level, and high-end pliotron M opens;
E, low-side driver circuitry control wave B open low side pliotron G, and said driving circuit for electromagnetic valve L connects, and the high drive power supply promotes said electromagnetic valve driving current;
F, be elevated to greater than said peak drive current I when said electromagnetic valve driving current
HAfter, said signal processing circuit is sent low level control signal C to high-end drive circuit, and high-end pliotron M closes, and said electromagnetic valve driving current descends;
G, drop to less than said peak drive current I when said electromagnetic valve driving current
HAfter, repeating step D is to step G, up to said peak current retentive control pulse signal A
HFinish;
H, as said peak current retentive control pulse signal A
HFinish, it is U that the reference voltage input terminal of the control module in the said signal processing circuit obtains level
LControl signal A
L /, level U
LKeep drive current I
L
I, when said electromagnetic valve driving current greater than the said drive current I that keeps
LThe time, said signal processing circuit is sent low level control signal C to high-end drive circuit, and high-end pliotron M closes, and said electromagnetic valve driving current descends;
J, drop to less than the said drive current I that keeps when said electromagnetic valve driving current
LAfter, said signal processing circuit is to the control signal C of high-end drive circuit transmission high level, and high-end pliotron M opens, and said electromagnetic valve driving current rises;
K, when said electromagnetic valve driving current greater than the said drive current I that keeps
LAfter, repeating step I is to step K, up to said Current Feedback Control pulse signal A
FFinish;
L, as said Current Feedback Control pulse signal A
FFinish, said signal processing circuit is sent low level control signal C to high-end drive circuit, and high-end pliotron M closes;
M, said low-side driver circuitry control wave B finish, and low side pliotron G closes, and said electromagnetic valve driving current drops to zero.
2. the production method of a kind of electromagnetic valve driving current according to claim 1 is characterized in that, said peak drive current I
HWith the said drive current I that keeps
LBe to preestablish according to said electromagnetically operated valve type, said electromagnetically operated valve unlatching time, adhesive electromagnetic force.
3. the production method of a kind of electromagnetic valve driving current according to claim 1; It is characterized in that; The quantity of said low-side driver circuitry equals said electromagnetically operated valve quantity, corresponding one tunnel low-side driver circuitry control wave B of each low-side driver circuitry, and sequential is confirmed by engine firing order.
4. according to the production method of claim 1 or 3 described a kind of electromagnetic valve driving currents, it is characterized in that said peak current retentive control pulse signal A
HWith said Current Feedback Control pulse signal A
FThe rising edge effect constantly identical, said peak current retentive control pulse signal A
HBe shorter than said Current Feedback Control pulse signal A action time
FAction time, said Current Feedback Control pulse signal A
FWaveform is consistent with the waveform of whole said low-side driver circuitry control wave B.
5. the production method of a kind of electromagnetic valve driving current according to claim 1; It is characterized in that; If said electromagnetic valve driving current is greater than the reference voltage current corresponding of the reference voltage input terminal acquisition of said control module, the result of the comparator in the said control module is low, and said result is by the flip/flops latch in the said control module; Said trigger is output as low, and said signal processing circuit is sent low level control signal C to high-end drive circuit; If said electromagnetic valve driving current is less than the reference voltage current corresponding of the reference voltage input terminal acquisition of said control module; The result of the comparator in the said control module is high; Said result is by the flip/flops latch in the said control module; Said trigger is output as height, and said signal processing circuit is sent the control signal C of high level to high-end drive circuit.
6. the production method of a kind of electromagnetic valve driving current according to claim 5; It is characterized in that; Each clock cycle; Comparator in the said control module compares the reference voltage current corresponding of the reference voltage input terminal acquisition of said electromagnetic valve driving current and said control module, and the effect of latching of said trigger continues a clock cycle.
7. the generation device of an electromagnetic valve driving current; Be applicable to engine fuel injection system; It is characterized in that, comprise electronic control unit, signal processing circuit, high-end drive circuit, low-side driver circuitry and sampling resistor, said high-end drive circuit is connected with said electromagnetically operated valve one end through said sampling resistor; Said low-side driver circuitry is connected the other end of said electromagnetically operated valve, and said electronic control unit is used for sending peak current retentive control pulse signal A to signal processing circuit
HWith Current Feedback Control pulse signal A
FAnd to low-side driver circuitry transmission low-side driver circuitry control wave B; Said signal processing circuit is used for the electromagnetic valve driving current and the reference voltage current corresponding of said sampling resistor feedback are compared, and to the said high-end drive circuit C that transmits control signal.
8. the generation device of a kind of electromagnetic valve driving current according to claim 7; It is characterized in that; Said high-end drive circuit comprises high voltage source, battery feed, diode and high-end pliotron; Said high voltage source, battery feed are isolated through said diode, and are connected with said high-end pliotron source S end, and the grid G end of said high-end pliotron connects said signal processing circuit; Be used to receive said control signal, said sampling resistor is connected with the drain D end of said high-end pliotron.
9. the generation device of a kind of electromagnetic valve driving current according to claim 7; It is characterized in that; Said low-side driver circuitry comprises low side pliotron and fly-wheel diode; The quantity of said low side pliotron equals the quantity of said electromagnetically operated valve; The grid G end of said low side pliotron is used to receive low-side driver circuitry control wave B, and the source S end is connected with the positive pole of said fly-wheel diode, and the negative pole of drain D end and said fly-wheel diode is connected with an end of said sampling resistor.
10. the generation device of a kind of electromagnetic valve driving current according to claim 7; It is characterized in that; Said signal processing circuit comprises control module, photoelectrical coupler and voltage-stabiliser tube; Said control module is used for the electromagnetic valve driving current and the reference voltage current corresponding of more said sampling resistor feedback and the C that transmits control signal, and said photoelectrical coupler is used for said peak current retentive control pulse signal A
HWith Current Feedback Control pulse signal A
FConverting level to is U
HControl signal A
H /With level be U
LControl signal A
L /And sending to said control module, said voltage-stabiliser tube is used to control the voltage of said control signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102234003A CN101477870B (en) | 2008-09-27 | 2008-09-27 | Generation method and apparatus for electromagnetic valve driving current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102234003A CN101477870B (en) | 2008-09-27 | 2008-09-27 | Generation method and apparatus for electromagnetic valve driving current |
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| Publication Number | Publication Date |
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| CN101477870A CN101477870A (en) | 2009-07-08 |
| CN101477870B true CN101477870B (en) | 2012-02-15 |
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| CN2008102234003A Expired - Fee Related CN101477870B (en) | 2008-09-27 | 2008-09-27 | Generation method and apparatus for electromagnetic valve driving current |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5019303B2 (en) * | 2010-03-03 | 2012-09-05 | Ｓｍｃ株式会社 | Electromagnetic valve driving circuit, electromagnetic valve, and electromagnetic valve driving method |
| CN101893123B (en) * | 2010-06-08 | 2012-03-28 | 陆国祥 | High-speed solenoid valve drive circuit and implementing method thereof |
| CN101956860B (en) * | 2010-10-28 | 2012-01-04 | 哈尔滨工业大学 | Driving device of solenoid directional valve |
| CN102879678B (en) * | 2012-09-24 | 2015-06-03 | 北京二七轨道交通装备有限责任公司 | Tester for electromagnetic valve |
| CN102966452B (en) * | 2012-11-30 | 2015-06-10 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Electromagnetic valve driving device |
| CN104373662B (en) * | 2014-12-03 | 2016-08-17 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | The method and apparatus controlling magnetic valve |
| CN107580663B (en) * | 2015-03-18 | 2019-04-23 | 自动开关公司 | Ensure the release of the solenoid valve by peak holding driver control |
| CN106122565B (en) * | 2016-08-30 | 2018-07-20 | 上海太易检测技术有限公司 | High-speed electromagnetic valve driver circuit |
| CN106677946B (en) * | 2016-12-14 | 2019-05-14 | 中国第一汽车股份有限公司 | The device of fuel injector magnetic system armature operating point can be detected |
| CN108345244B (en) * | 2018-01-29 | 2020-10-27 | 中国第一汽车股份有限公司 | Self-diagnosis driving method and circuit for controlling electromagnetic actuator in internal combustion engine |
| CN110242786B (en) * | 2019-06-14 | 2021-02-23 | 中国神华能源股份有限公司 | Controller of servo solenoid valve, control method and device for servo solenoid valve |
| CN111459220B (en) * | 2020-04-10 | 2021-12-28 | 西南科技大学 | High-inductance constant-current driving control method for electromagnetic valve |
| CN111852675A (en) * | 2020-08-14 | 2020-10-30 | 无锡职业技术学院 | Fault diagnosis system for oil injector |
| CN112104210A (en) * | 2020-09-16 | 2020-12-18 | 湖南行必达网联科技有限公司 | Drive circuit, drive system, drive method and gearbox |
| CN112393008B (en) * | 2020-11-16 | 2022-11-29 | 湖南行必达网联科技有限公司 | Drive circuit of automatic transmission electromagnetic valve and automatic transmission |
| CN112983587B (en) * | 2021-02-06 | 2021-12-21 | 无锡职业技术学院 | VVA solenoid valve driving system with closing detection function |
| CN115800970B (en) * | 2023-01-29 | 2023-07-04 | 永联科技(常熟)有限公司 | Level-switchable multi-channel PWM wave push-pull output device and method |
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| CN101477870A (en) | 2009-07-08 |
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