CN104500298B - Driving current control circuit of piezoelectric ceramic diesel injector - Google Patents
Driving current control circuit of piezoelectric ceramic diesel injector Download PDFInfo
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- CN104500298B CN104500298B CN201410725730.8A CN201410725730A CN104500298B CN 104500298 B CN104500298 B CN 104500298B CN 201410725730 A CN201410725730 A CN 201410725730A CN 104500298 B CN104500298 B CN 104500298B
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Abstract
The invention relates to a driving current control circuit of a piezoelectric ceramic diesel injector. The driving current control circuit of the piezoelectric ceramic diesel injector comprises a first processor and a piezoelectric ceramic executor, wherein the high-voltage end of the piezoelectric ceramic executor is connected with the source electrode end of a high-voltage charging switch tube T1 and is connected with the drain electrode end of a discharge switch tube T2; the source electrode end of the discharge switch tube T2 is grounded; the low-voltage end of the piezoelectric ceramic executor is connected with a sampling threshold value processing circuit for sampling working current of the piezoelectric ceramic executor; the sampling threshold value processing circuit is connected with a current control circuit; the current control circuit is connected with the grid electrode end of the high-voltage charging switch tube T1 and the grid electrode end of the discharge switch tube T2 through a driving logic circuit respectively. The driving current control circuit of the piezoelectric ceramic diesel injector is compact in structure, and can accurately control driving current so as to ensure the consistency of the driving current, reduce the switching loss and improve the reliability of an electric control system.
Description
Technical field
The present invention relates to a kind of driving current control circuit, the driving electricity of especially a kind of diesel engine piezoelectric ceramics oil spout device
Flow control circuit, belongs to the technical field of diesel engine piezoelectric ceramics injection system.
Background technology
For diesel injector, Siemens Company's intervention piezoelectric system drives relatively early, proposition basic driver structure first；
Bosh company combines Full Vehicle System, proposes many actual prioritization schemes controlling etc.；Current control scheme typically all adopts can
Become pwm to drive, control the process being flushed to larger pulsed drive from scun that drives, list of references such as us8074626b2,
jp04615967b2；Or variable duty ratio controls pwm drive pattern, list of references such as ep1772952b1.Current control mode
It is substantially and samples after relatively by hardware and pwm direct-coupling, in extreme circumstances (as high rotating speed multi-injection requires) work(
Rate device thermal losses is more serious.
At present, abroad because the particularity of piezoelectric has been tackled key problems successfully, substantially only need to the high current to executor
The protection doing general aspects controls.Even if there is current control, it is also by the Voltage Feedback cooperation based on sampling resistor
The pwm of mcu controls to realize basic current control, the limited precision of current control.And domestic executor can not hold at present
By very high rush of current, need electric current is done more being accurately controlled.Some schemes are also adopted by sampling resistor feedback control electricity
Stream, but be intended to by current control in lower value, system loss is larger, and heating is serious, does not have the transition of latch to couple, switch
Frequency is high, and device heating is serious, and electromagnetic interference is also more serious.
Content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, provides a kind of diesel engine piezoelectric ceramics oil spout device
Driving current control circuit, its compact conformation, enable the precise control to driving current it is ensured that the concordance of driving current,
Reduce switching loss, improve the reliability of electric-control system.
The technical scheme providing according to the present invention, the driving current control circuit of described diesel engine piezoelectric ceramics oil spout device,
Including first processor and piezoelectric ceramic actuator；The high-pressure side of described piezoelectric ceramic actuator and high-voltage charging switching tube t1
Source terminal connect and be connected with the drain electrode end of discharge switch pipe t2, the source terminal of discharge switch pipe t2 is grounded；Described piezoelectricity
The low-pressure end of ceramic executor and the sampling threshold process circuit for the operating current sampling to described piezoelectric ceramic actuator
Connect, described sampling threshold process circuit is connected with current control circuit, current control circuit is by logic drive circuit respectively
It is connected with the gate terminal of high-voltage charging switching tube t1, the gate terminal of discharge switch pipe t2；
First processor is connected with current control circuit, and can enable signal to current control circuit input radio frequency capture；
When in the operating current on piezoelectric ceramic actuator with sampling threshold process circuit, predetermined current threshold mismatches, sampling threshold
Process circuit controls trigger to current control circuit output threshold current, and current control circuit enables letter by radio frequency capture
The threshold current that number can effectively capture sampling threshold circuit output controls trigger, and current control circuit is according to the threshold value of capture
Current control trigger output current control signal, logic drive circuit adjusts high-voltage charging switch according to current controling signal
Pipe t1, the corresponding on off state of discharge switch pipe t2, so that the operating current of piezoelectric ceramic actuator and predetermined current threshold
Match.
Described first processor is connected with sampling threshold process circuit, and first processor can pass to sampling threshold process circuit
Transmission of electricity stream adjusts control signal, to adjust the predetermined current in sampling threshold process circuit by described current regulation control signal
Threshold value.
The high-pressure side of described piezoelectric ceramic actuator passes through the source terminal of inductance gating circuit and high-voltage charging switching tube t1
Connect and be connected with the drain electrode end of discharge switch pipe t2, the low-pressure end of piezoelectric ceramic actuator is grounded by sampling resistor r1,
Sampling threshold process circuit is connected with sampling resistor r1, to gather the work electricity of piezoelectric ceramic actuator by sampling resistor r1
Stream；First processor can input inductance gating signal to inductance gating circuit, and inductance gating circuit is according to inductance gating signal energy
Adjust the inductance value being connected with described piezoelectric ceramic actuator.
Described sampling threshold process circuit includes the electric current for being sampled to the operating current of piezoelectric ceramic actuator
Sample circuit and for the threshold value control circuit of process is compared to the operating current of current sampling circuit sampling；Threshold value control
In circuit processed, there is predetermined current threshold, when the operating current of sampling is mismatched with predetermined current threshold, threshold value control circuit
Control trigger to current control circuit output threshold current.
Described current control circuit includes second processing device and latch, and described second processing device, latch all receive
The threshold current of sampling threshold process circuit output controls trigger, and second processing device receives first processor output simultaneously
Radio frequency capture enable signal；Enable under signal function in radio frequency capture, when second processing device is simultaneously received threshold current control
During trigger processed, second processing device can be to latch output services current control trigger, and latch is according to operating current
Trigger and threshold current is controlled to control trigger output current control signal, so that logic drive circuit is according to electricity
Flow control signals adjust the on off state of high-voltage charging switching tube t1 and discharge switch pipe t2.
Described logic drive circuit include first with door u1 and second and door u2, first with the input of door u1, the
Two are all connected with the outfan of current control circuit with an input of door u2, at first and door u1 another input and first
The outfan of reason device connects, to receive the high-voltage switch gear charging signals of first processor output；Second and door u2 another input
End is connected with the outfan of first processor, to receive the discharge tube work trigger of first processor output；First and door
The outfan of u1 is connected with the gate terminal of high-voltage charging switching tube t1, second with the grid of the outfan of door u2 and discharge switch pipe t2
Extreme connection；
First can drive unlatching high-voltage charging switch according to the high-voltage switch gear charging signals of first processor output with door u1
Pipe t1, and high-voltage charging switching tube t1 can be turned off according to the current controling signal of current control circuit output；Second with door u2 energy
Driven according to the discharge tube work trigger of first processor output and open discharge switch pipe t2, and can be according to current control electricity
The current controling signal of road output turns off discharge switch pipe t2.
The outfan of described current control circuit is connected with first processor, to control letter to first processor output current
Number；First processor can count to current controling signal, when the count value of first processor reaches pre-set count values, the
One processor can simultaneously turn off high-voltage charging switching tube t1 and discharge switch pipe t2 by logic drive circuit.
Described inductance gating circuit includes inductance l1 and inductance l2, the anode tap of one end of inductance l1 and diode d1,
The cathode terminal of diode d2, the drain electrode end of switching tube q1, the source terminal of high-voltage charging switching tube t1 and discharge switch pipe t2's
Drain electrode end connects, and the other end of inductance l1 is connected with the anode tap of diode d3 and the cathode terminal of diode d4, diode d2
Anode tap and the anode tap of diode d4 be all grounded, the cathode terminal of diode d1, the cathode terminal of diode d1, diode d3
Cathode terminal be all connected with high-voltage power supply vcc_boost；The gate terminal of switching tube q1 passes through the defeated of boostrap circuit and first processor
Go out end to connect, to receive the inductance gating signal of first processor output；The source terminal of one end of inductance l2 and switching tube q1 with
And the cathode terminal of diode d5 connects, the other end of inductance l2 is connected with the anode tap of diode d6, the anode tap of diode d5
Ground connection, the cathode terminal of diode d6 is connected with high-voltage power supply vcc_boost.
Described second processing device includes cpld processor u4 and phase inverter u3, and described phase inverter u3 is controlled with sampling threshold
The outfan of circuit connects, and the outfan of phase inverter u3 is connected with the input of cpld processor u4, and cpld processor u4 also connects
The radio frequency capture receiving first processor output enables signal, and cpld processor u4 can trigger to latch output services current control
Signal.
Described sampling threshold process circuit includes amplifier u6, and the in-phase end of described amplifier u6 is connected with one end of resistance r2
Connect, the end of oppisite phase of amplifier u6 is connected with one end of resistance r3 and one end of resistance r4, the other end ground connection of resistance r3, resistance
The other end of r4 is connected with the outfan of amplifier u6 and one end of resistance r5, and resistance r5 passes through resistance r10 and resistance r11's
One end connects, and the other end of resistance r11 is connected with one end of one end, the end of oppisite phase of comparator u7 and resistance r12 of electric capacity c1,
The other end of electric capacity c1 is connected with one end of the in-phase end, one end of resistance r9 and resistance r8 of comparator u7, and resistance r9's is another
One end is connected with da module, and the other end of resistance r8 is connected with the collector terminal of audion q2, the emitter stage termination of audion q2
Ground, the base terminal of audion q2 is connected with one end of resistance r6 and one end of resistance r7, the other end ground connection of resistance r7；Resistance
The other end of r12 is connected with one end of the outfan, one end of resistance r13 and resistance r14 of comparator u7, and resistance r13's is another
One end is connected with+3.3v voltage.
Advantages of the present invention: piezoelectric ceramic actuator is connected with inductance gating circuit, inductance gating circuit is selected by inductance
The messenger inductance value that is connected with described piezoelectric ceramic actuator of regulation, so as to change piezoelectric ceramic actuator operationally
Current transformation, realizes the different current-responsive times；Threshold value control circuit can by the operating current of piezoelectric ceramic actuator with pre-
If current threshold compares, and threshold current control trigger can be exported, first processor can adjust in threshold value control circuit
Predetermined current threshold, so as to make piezoelectric ceramic actuator have different peak point currents so that driving process be one gradually
Change process, second processing device adopts cpld processor, and cpld processor enables under signal function to threshold current in radio frequency capture
Control the seizure of trigger, latch controls trigger to control trigger to lock threshold current according to operating current
Deposit and output current control signal, logic drive circuit adopts two and door, realized to high-voltage charging by current controling signal
Switching tube, discharge switch pipe on off state control, enable the precise control to driving current it is ensured that driving current consistent
Property, reduce switching loss, improve the reliability of electric-control system.
Brief description
Fig. 1 is the structured flowchart of the present invention.
Fig. 2 is the circuit theory diagrams of inductance gating circuit of the present invention.
Fig. 3 is the circuit theory diagrams of current control circuit of the present invention.
Fig. 4 is the circuit theory diagrams of sampling threshold process circuit of the present invention.
Description of reference numerals: 1- first processor, 2- inductance gating circuit, 3- piezoelectric ceramic actuator, 4- sampling threshold
Process circuit, 5- current sampling circuit, 6- threshold value control circuit, 7- current control circuit, 8- second processing device, 9- latch,
10- boostrap circuit and 11-da module.
Specific embodiment
With reference to concrete drawings and Examples, the invention will be further described.
As shown in Figure 1: in order to enable the precise control to driving current it is ensured that the concordance of driving current, reduction is opened
Close loss, improve the reliability of electric-control system, the present invention includes first processor 1 and piezoelectric ceramic actuator 3；Described piezoelectricity
The high-pressure side of ceramic executor 3 is connected with the source terminal of high-voltage charging switching tube t1 and is connected with the drain electrode end of discharge switch pipe t2
Connect, the source terminal ground connection of discharge switch pipe t2；The low-pressure end of described piezoelectric ceramic actuator 3 with for holding to described piezoelectric ceramics
The sampling threshold process circuit 4 of the operating current sampling of row device 3 connects, and described sampling threshold process circuit 4 is electric with current control
Road 7 connects, and current control circuit 7 passes through logic drive circuit gate terminal, the discharge switch with high-voltage charging switching tube t1 respectively
The gate terminal of pipe t2 connects；
First processor 1 is connected with current control circuit 7, and can enable letter to current control circuit 7 input radio frequency capture
Number；When in the operating current on piezoelectric ceramic actuator 3 with sampling threshold process circuit 4, predetermined current threshold mismatches, adopt
Sample thresholding circuit 4 controls trigger to current control circuit 7 output threshold current, and current control circuit 7 passes through high frequency
Capture enables the threshold current control trigger that signal can effectively capture sampling threshold circuit 4 output, current control circuit 7
Threshold current according to capture controls trigger output current control signal, and logic drive circuit is adjusted according to current controling signal
High-voltage charging switching tube t1, the corresponding on off state of discharge switch pipe t2 so that the operating current of piezoelectric ceramic actuator 3 with
Predetermined current threshold matches.
Specifically, piezoelectric ceramic actuator 3 is the executor of piezoelectric ceramics oil spout device in common rail system, and high-voltage charging switchs
The source terminal of pipe t1 is connected with high-voltage power supply vcc_boost, and high-voltage charging switching tube t1 and discharge switch pipe t2 is all managed using mos.
When high-voltage charging switching tube t1 opens work, high-voltage power supply vcc_boost can be charged to piezoelectric ceramic actuator 3, when putting
When electric switch pipe t2 opens work, piezoelectric ceramic actuator 3 can be discharged, in a cycle of piezoelectric ceramic actuator 3
In, high-voltage charging switching tube t1 and discharge switch pipe t2 is not in the state simultaneously opening work, high-voltage charging switching tube t1
Conduction period and discharge switch pipe t2 between is fuel injection pulsewidth.First processor 1 is using conventional micro-chip processor
Or integrated circuit, such as single-chip microcomputer etc., first processor 1 can be realized by logic drive circuit and current control circuit 7
To high-voltage charging switching tube t1, the control of the on off state of discharge switch pipe t2 and regulation.
In the embodiment of the present invention, the operating current of piezoelectric ceramic actuator 3 includes charging operating current and electric discharge work
Electric current, the operating current on piezoelectric ceramic actuator 3 is mismatched with predetermined current threshold in sampling threshold process circuit 4 and refers to institute
The operating current stating piezoelectric ceramic actuator 3 is more than predetermined current threshold, and that is, charging operating current or electric discharge operating current are more than
Predetermined current threshold, now sampling threshold circuit 4 can be to current control circuit 7 output threshold current control trigger；Wherein,
Predetermined current threshold in sampling threshold process circuit 4 can select to set according to the work of different piezoelectric ceramic actuators 3, tool
Body process and be set to known to those skilled in the art, here is omitted.First processor 1 is always to current control circuit
7 output radio frequency captures enable signal, and current control circuit 7 enables under signal function in radio frequency capture, can be to threshold current control
Trigger is captured, and controls trigger output current control signal according to threshold current.
Logic drive circuit adjusts high-voltage charging switching tube t1 according to current controling signal, discharge switch pipe t2 opens accordingly
Off status, specifically refers to, and makes piezoelectric ceramic actuator 3 in the charging stage when high-voltage charging switching tube t1 opens, and piezoelectricity pottery
When charging operating current on porcelain executor 3 is more than predetermined current threshold, logic drive circuit turns off high-voltage charging switching tube t1；
Make electric discharge work on discharge regime, and piezoelectric ceramic actuator 3 for the piezoelectric ceramic actuator 3 when discharge switch pipe t2 opens
When electric current is more than predetermined current threshold, logic drive circuit turns off discharge switch pipe t2 so that the charging of piezoelectric ceramic actuator 3
Operating current, electric discharge operating current are mated with predetermined current threshold, realize the accurate control to piezoelectric ceramic actuator 3 operating current
System.Additionally, in the embodiment of the present invention, charging operating current, electric discharge operating current are mated with predetermined current threshold or fill
Difference between electric operating current, electric discharge operating current and predetermined current threshold is in the range of error of a license, specifically
Known to those skilled in the art, specifically repeat no more.
Further, described first processor 1 is connected with sampling threshold process circuit 4, and first processor 1 can be to sampling threshold
Value process circuit 4 transmission current regulation control signal, processes electricity to adjust sampling threshold by described current regulation control signal
Predetermined current threshold in road 4.
In the practical application of diesel engine piezoelectric ceramics oil spout device, sampling threshold process circuit 4 needs to set in different phase
Put different predetermined current threshold, in order to different predetermined current threshold, in the embodiment of the present invention, first processor 1 with adopt
Sample thresholding circuit 4 connects, and sampling threshold process circuit 4 can adjust predetermined current threshold according to current regulation control signal
Value is such that it is able to the operating current adapting to different phase for piezoelectric ceramic actuator 3 controls.
Described sampling threshold process circuit 4 includes the electricity for being sampled to the operating current of piezoelectric ceramic actuator 3
Flow sample circuit 5 and the operating current for sampling to current sampling circuit 5 is compared the threshold value control circuit 6 of process；
In threshold value control circuit 6, there is predetermined current threshold, when the operating current of sampling is mismatched with predetermined current threshold, threshold value control
Circuit 6 processed controls trigger to current control circuit 7 output threshold current.
As shown in figure 4, described sampling threshold process circuit 4 includes amplifier u6, the in-phase end of described amplifier u6 and electricity
One end of resistance r2 connects, and the end of oppisite phase of amplifier u6 is connected with one end of resistance r3 and one end of resistance r4, and resistance r3's is another
One end is grounded, and the other end of resistance r4 is connected with the outfan of amplifier u6 and one end of resistance r5, and resistance r5 passes through resistance
R10 is connected with one end of resistance r11, one end of the other end of resistance r11 and electric capacity c1, the end of oppisite phase of comparator u7 and resistance
One end of r12 connects, and the other end of electric capacity c1 is connected with one end of the in-phase end, one end of resistance r9 and resistance r8 of comparator u7
Connect, the other end of resistance r9 is connected with da module 11, the other end of resistance r8 is connected with the collector terminal of audion q2, audion
The emitter terminal ground connection of q2, the base terminal of audion q2 is connected with one end of resistance r6 and one end of resistance r7, resistance r7's
The other end is grounded；The other end of resistance r12 is connected with one end of the outfan, one end of resistance r13 and resistance r14 of comparator u7
Connect, the other end of resistance r13 is connected with+3.3v voltage.
Specifically, amplifier u6, resistance r2, resistance r3, resistance r4 and r5 constitute current sampling circuit 5, da module 11
And audion q2 forms the adjustment member of predetermined current threshold, the part of comparator u7 is used for obtaining current sampling circuit 5
Operating current compare with predetermined current threshold.When operating current is more than predetermined current threshold, comparator u7 passes through resistance r14
One threshold current of output controls trigger, as i_control1, anti-phase due to current sampling circuit 5 and comparator u7
End connects, and therefore, it is a low level signal that threshold current controls trigger.
One end of resistance r2 is connected with the in-phase end of amplifier u6, the other end of resistance r2 and piezoelectric ceramic actuator 3
Low-pressure end and sampling resistor r1 connect, the positive supply termination 5v voltage of amplifier u6, the negative power end ground connection of amplifier u6.Than
Positive power source terminal compared with device u7 is connected with+5v voltage, and the positive power source terminal of comparator u7 is grounded by electric capacity c2, and the one of resistance r14
End is connected with the outfan of comparator u7, and the other end of resistance r14 is connected with current control circuit 7.At da module 11 and first
The outfan of reason device 1 connects, and the base terminal of audion q2 is connected with one end of resistance r6, the other end of resistance r6 also with first at
The outfan of reason device 1 connects.Da module 11 receives the current regulation control signal of first processor 1 output, da module 11 basis
Current regulation control signal can export a voltage of 0 ~ 5v, and described voltage is carried in the homophase of comparator u7 by resistance r9
End.After the other end of resistance r6 is connected with first processor 1, the electric current conversion signal of first processor 1 output, electric current conversion letter
Number be peak_en1 effect drive audion q2, when audion q2 driving turn on after, can coordinate with da module 11, will compare
Improve compared with the comparator of device u7 in-phase end, quickly can effectively adjust the predetermined current threshold in threshold value control circuit 6.
Further, in order to adjust the change curve of the operating current of piezoelectric ceramic actuator 3, described piezoelectric ceramics
The high-pressure side of executor 3 is connected and and discharge switch with the source terminal of high-voltage charging switching tube t1 by inductance gating circuit 2
The drain electrode end of pipe t2 connects, and the low-pressure end of piezoelectric ceramic actuator 3 is grounded by sampling resistor r1, sampling threshold process circuit 4
It is connected with sampling resistor r1, to gather the operating current of piezoelectric ceramic actuator 3 by sampling resistor r1；First processor 1 energy
Input inductance gating signal to inductance gating circuit 2, inductance gating circuit 2 can be adjusted and described piezoelectricity according to inductance gating signal
The inductance value that ceramic executor 3 connects.
As shown in Fig. 2 described inductance gating circuit 2 includes inductance l1 and inductance l2, one end of inductance l1 and diode
The anode tap of d1, the cathode terminal of diode d2, the drain electrode end of switching tube q1, the source terminal of high-voltage charging switching tube t1 and electric discharge
The drain electrode end of switching tube t2 connects, and the other end of inductance l1 is connected with the anode tap of diode d3 and the cathode terminal of diode d4
Connect, the anode tap of the anode tap of diode d2 and diode d4 is all grounded, the cathode terminal of diode d1, the negative electrode of diode d1
End, the cathode terminal of diode d3 are all connected with high-voltage power supply vcc_boost；The gate terminal of switching tube q1 passes through boostrap circuit 10 and the
The outfan of one processor 1 connects, to receive the inductance gating signal of first processor 1 output；One end of inductance l2 and switch
The cathode terminal of the source terminal of pipe q1 and diode d5 connects, and the other end of inductance l2 is connected with the anode tap of diode d6, and two
The anode tap ground connection of pole pipe d5, the cathode terminal of diode d6 is connected with high-voltage power supply vcc_boost.
In the embodiment of the present invention, boostrap circuit 10 can receive inductance gating signal, can be driven by boostrap circuit 10
Switching tube q1.After high-voltage charging switching tube t1 turns on, the one end due to the source terminal inductance l1 of high-voltage charging switching tube t1 connects
Connect, one end that the other end of inductance l2 is connected with diode d6 anode tap is connected with the high-pressure side of piezoelectric ceramic actuator 3, because
This, high-voltage power supply vcc_boost passes through the source terminal of high-voltage charging switching tube t1 and inductance l1 can be to piezoelectric ceramic actuator 3
High-pressure side is charged.When needing to adjust the inductance value being connected with piezoelectric ceramic actuator 3, first processor 1 passes through inductance
Gating signal and boostrap circuit 10 driving switch pipe q1 conducting, after switching tube q1 conducting, inductance l1 is in parallel with inductance l2 realization,
It is achieved thereby that the inductance value that adjustment is connected with piezoelectric ceramic actuator 3.Diode d1 ~ diode d6 is capable of effectively protecting
Shield.
Described current control circuit 7 includes second processing device 8 and latch 9, and described second processing device 8, latch 9 are equal
The threshold current receiving sampling threshold process circuit 4 output controls trigger, and second processing device 8 receives the first process simultaneously
The radio frequency capture of device 1 output enables signal；Enable under signal function in radio frequency capture, when second processing device 8 is simultaneously received threshold
During value current control trigger, second processing device 8 can be to latch 9 output services current control trigger, latch 9
Trigger and threshold current is controlled to control trigger output current control signal according to operating current, so that logical drive
Circuit adjusts the on off state of high-voltage charging switching tube t1 and discharge switch pipe t2 according to current controling signal.
As shown in figure 3, described second processing device 8 includes cpld processor u4 and phase inverter u3, described phase inverter u3 with
The outfan of sampling threshold control circuit 4 connects, and the outfan of phase inverter u3 is connected with the input of cpld processor u4, cpld
The radio frequency capture that processor u4 also receives first processor 1 output enables signal, and cpld processor u4 can export work to latch 9
Make current control trigger.
Specifically, second processing device 8 adopts cpld, effectively can enable signal to radio frequency capture using cpld processor u4
Captured, meanwhile, trigger can be controlled to the threshold current of sampling threshold process circuit 4 output by cpld processor u4
Captured.The input of phase inverter u3 is used for receiving threshold current and controls trigger, by phase inverter u3 reverse after, can be
A high level is obtained, now cpld(complex programmable logic device in cpld processor u4) process
Device u4 can be to latch 9 input service current control trigger, and described operating current controls trigger and latch 9
Sck end connects, using the clock signal as latch 9.The power end of latch 9 is connected with+5v voltage, the input of latch 9
End controls trigger to be connected with threshold current, and when operating current controls trigger effectively, latch 9 can be by threshold current control
Trigger processed carries out latching output, can output current control signal.Within the latch time of latch 9, current control is believed
Number effectively, when current controling signal is effective, high-voltage charging switching tube t1 can be turned off by logic drive circuit or turn off electric discharge
Switching tube t2 it is achieved that the control of charging current to piezoelectric ceramic actuator 3 and discharge current, during the latch of latch 9
Between can be set as needed, latch time of latch 9 is that known to those skilled in the art, here is omitted.
In the embodiment of the present invention, trigger capture is controlled to threshold current by cpld processor u4, latch 9 is to threshold current control
Trigger processed is latched, and within the latch time of latch 9, can keep the constant effective of current controling signal, can
Improve the control accuracy of the operating current of piezoelectric ceramic actuator 3, the power consumption of current-modulation can be reduced and system resource is opened
Pin.
Described logic drive circuit include first with door u1 and second and door u2, first with the input of door u1, the
Two are all connected with the outfan of current control circuit 7 with an input of door u2, first and door u1 another input and first
The outfan of processor 1 connects, to receive the high-voltage switch gear charging signals of first processor 1 output；Second is another with door u2
Input is connected with the outfan of first processor 1, to receive the discharge tube work trigger of first processor 1 output；The
One is connected with the gate terminal of high-voltage charging switching tube t1 with the outfan of door u1, second with the outfan of door u2 and discharge switch pipe
The gate terminal of t2 connects；
First can drive unlatching high-voltage charging switch according to the high-voltage switch gear charging signals of first processor 1 output with door u1
Pipe t1, and high-voltage charging switching tube t1 can be turned off according to the current controling signal of current control circuit 7 output；Second with door u2 energy
Driven according to the discharge tube work trigger of first processor 1 output and open discharge switch pipe t2, and can be according to current control
The current controling signal of circuit 7 output turns off discharge switch pipe t2.
In the embodiment of the present invention, first and door u1 input can receive the high-voltage switch gear of first processor 1 output respectively
Charging signals and latch 9 output current controling signal, when high-voltage switch gear charging signals be high level effective when, first with
The outfan of door u1 can drive unlatching high-voltage charging switching tube t1；And latch 9 output current controling signal effective when, first
High-voltage charging switching tube t1 can be turned off with the outfan of door u1.In second and door u2, as the second electric discharge plumber receiving with door u2
Make trigger effective when, second can drive with the outfan of door u2 and open discharge switch pipe t2, now, piezoelectric ceramic actuator
3 can carry out discharge regime by discharge switch pipe t2.When piezoelectric ceramic actuator 3 in discharge regime and latch 9 output electricity
When flow control signals are effective, second can turn off discharge switch pipe t2 with door u2, it is to avoid the discharge current on piezoelectric ceramic actuator 3
Exceed predetermined current threshold.
Further, the outfan of described current control circuit 7 is connected with first processor 1, with defeated to first processor 1
Go out current controling signal；First processor 1 can count to current controling signal, when the count value of first processor 1 reaches
During pre-set count values, first processor 1 can simultaneously turn off high-voltage charging switching tube t1 by logic drive circuit and electric discharge is opened
Close pipe t2.
In the embodiment of the present invention, the pre-set count values in first processor 1 can carry out selecting to set as needed, electric current
In control circuit 7, the outfan of latch 9 is simultaneously connected to the input of first processor 1, when the electric current control of latch 9 output
When signal processed is effective, first processor 1 counts, when count value reaches pre-set count values, first processor 1 pass through first with
Door u1, second and door u2 simultaneously turn off high-voltage charging switching tube t1 and discharge switch pipe t2, and piezoelectric ceramic actuator 3 is carried out
Protection.
Piezoelectric ceramic actuator 3 of the present invention is connected with inductance gating circuit 2, and inductance gating circuit 2 gates letter by inductance
Number adjust the inductance value that is connected with described piezoelectric ceramic actuator 3, so as to change piezoelectric ceramic actuator 3 electricity operationally
Rheology is changed, and realizes the different current-responsive times；Threshold value control circuit 6 can by the operating current of piezoelectric ceramic actuator 3 with pre-
If current threshold compares, and threshold current control trigger can be exported, first processor 1 can adjust in threshold value control circuit 6
Predetermined current threshold, so as to make piezoelectric ceramic actuator 3 have different peak point currents so that driving process be one
Progressive formation, second processing device 8 adopts cpld processor u4, and cpld processor u4 enables under signal function to threshold in radio frequency capture
The seizure of value current control trigger, latch 9 controls trigger that threshold current is controlled with triggering letter according to operating current
Number carry out latching and output current control signal, logic drive circuit adopts two and door, and it is right to realize by current controling signal
High-voltage charging switching tube t1, the on off state of discharge switch pipe t2 control, and enable the precise control to driving current it is ensured that driving
The concordance of streaming current, reduces switching loss, improves the reliability of electric-control system.
Claims (10)
1. a kind of driving current control circuit of diesel engine piezoelectric ceramics oil spout device, including first processor (1) and piezoelectricity pottery
Porcelain executor (3)；It is characterized in that: the high-pressure side of described piezoelectric ceramic actuator (3) and the source terminal of high-voltage charging switching tube t1
Connect and be connected with the drain electrode end of discharge switch pipe t2, the source terminal ground connection of discharge switch pipe t2；Described piezoelectric ceramics execution
The low-pressure end of device (3) and the sampling threshold process circuit (4) for the operating current sampling to described piezoelectric ceramic actuator (3)
Connect, described sampling threshold process circuit (4) is connected with current control circuit (7), current control circuit (7) passes through logical drive
Circuit is connected with the gate terminal of high-voltage charging switching tube t1, the gate terminal of discharge switch pipe t2 respectively；
First processor (1) is connected with current control circuit (7), and can enable to current control circuit (7) input radio frequency capture
Signal；When in the operating current on piezoelectric ceramic actuator (3) with sampling threshold process circuit (4), predetermined current threshold mismatches
When, sampling threshold process circuit (4) controls trigger, current control circuit to current control circuit (7) output threshold current
(7) signal is enabled by radio frequency capture and can effectively capture the threshold current control trigger that sampling threshold circuit (4) exports, electricity
Flow control circuit (7) according to capture threshold current control trigger output current control signal, logic drive circuit according to
Current controling signal adjusts high-voltage charging switching tube t1, the corresponding on off state of discharge switch pipe t2, so that piezoelectric ceramics is held
The operating current of row device (3) is matched with predetermined current threshold.
2. the driving current control circuit of diesel engine piezoelectric ceramics oil spout device according to claim 1, is characterized in that: described
First processor (1) is connected with sampling threshold process circuit (4), and first processor (1) can pass to sampling threshold process circuit (4)
Transmission of electricity stream adjusts control signal, default in sampling threshold process circuit (4) to be adjusted by described current regulation control signal
Current threshold.
3. the driving current control circuit of diesel engine piezoelectric ceramics oil spout device according to claim 1, is characterized in that: described
The high-pressure side of piezoelectric ceramic actuator (3) by inductance gating circuit (2) be connected with the source terminal of high-voltage charging switching tube t1 with
And be connected with the drain electrode end of discharge switch pipe t2, the low-pressure end of piezoelectric ceramic actuator (3) is grounded by sampling resistor r1, sampling
Thresholding circuit (4) is connected with sampling resistor r1, to gather the work electricity of piezoelectric ceramic actuator (3) by sampling resistor r1
Stream；First processor (1) can input inductance gating signal to inductance gating circuit (2), and inductance gating circuit (2) selects according to inductance
Messenger can adjust the inductance value being connected with described piezoelectric ceramic actuator (3).
4. the driving current control circuit of diesel engine piezoelectric ceramics oil spout device according to claim 3, is characterized in that: described
Sampling threshold process circuit (4) includes the current sample electricity for being sampled to the operating current of piezoelectric ceramic actuator (3)
Road (5) and the threshold value control circuit (6) being compared process for operating current that current sampling circuit (5) is sampled；Threshold
Duty control circuit has predetermined current threshold in (6), when the operating current of sampling is mismatched with predetermined current threshold, threshold value control
Circuit (6) processed controls trigger to current control circuit (7) output threshold current.
5. the driving current control circuit of diesel engine piezoelectric ceramics oil spout device according to claim 1, is characterized in that: described
Current control circuit (7) includes second processing device (8) and latch (9), and described second processing device (8), latch (9) all connect
Receive the threshold current control trigger that sampling threshold process circuit (4) exports, and second processing device (8) receives at first simultaneously
The radio frequency capture that reason device (1) exports enables signal；Enable under signal function in radio frequency capture, when second processing device (8) connects simultaneously
When receiving threshold current control trigger, second processing device (8) can trigger letter to latch (9) output services current control
Number, latch (9) controls trigger and threshold current to control trigger output current control signal according to operating current,
So that logic drive circuit adjusts the switch of high-voltage charging switching tube t1 and discharge switch pipe t2 according to current controling signal
State.
6. the driving current control circuit of diesel engine piezoelectric ceramics oil spout device according to claim 1, is characterized in that: described
Logic drive circuit include first with door u1 and second and door u2, first with the input of door u1, second and the one of door u2
Input is all connected with the outfan of current control circuit (7), first with another input of door u1 and first processor (1)
Outfan connects, to receive the high-voltage switch gear charging signals that first processor (1) exports；Second with another input of door u2 with
The outfan of first processor (1) connects, to receive the discharge tube work trigger that first processor (1) exports；First with
The outfan of door u1 is connected with the gate terminal of high-voltage charging switching tube t1, and second and door u2 outfan is with discharge switch pipe t2's
Gate terminal connects；
First can drive unlatching high-voltage charging switching tube according to the high-voltage switch gear charging signals that first processor (1) exports with door u1
T1, and high-voltage charging switching tube t1 can be turned off according to the current controling signal that current control circuit (7) export；Second with door u2 energy
Driven according to the discharge tube work trigger that first processor (1) exports and open discharge switch pipe t2, and can be according to electric current control
The current controling signal that circuit (7) processed exports turns off discharge switch pipe t2.
7. the driving current control circuit of diesel engine piezoelectric ceramics oil spout device according to claim 1, is characterized in that: described
The outfan of current control circuit (7) is connected with first processor (1), with to first processor (1) output current control signal；
First processor (1) can count to current controling signal, when the count value of first processor (1) reaches pre-set count values
When, first processor (1) can simultaneously turn off high-voltage charging switching tube t1 and discharge switch pipe t2 by logic drive circuit.
8. the driving current control circuit of diesel engine piezoelectric ceramics oil spout device according to claim 3, is characterized in that: described
Inductance gating circuit (2) includes inductance l1 and inductance l2, the anode tap of one end of inductance l1 and diode d1, diode d2
Cathode terminal, the drain electrode end of the drain electrode end of switching tube q1, the source terminal of high-voltage charging switching tube t1 and discharge switch pipe t2 connect,
The other end of inductance l1 is connected with the anode tap of diode d3 and the cathode terminal of diode d4, the anode tap of diode d2 and
The anode tap of diode d4 is all grounded, the cathode terminal of diode d1, the cathode terminal of diode d1, diode d3 cathode terminal all with
High-voltage power supply vcc_boost connects；The gate terminal of switching tube q1 is passed through boostrap circuit (10) and is connected with the outfan of first processor (1)
Connect, to receive the inductance gating signal that first processor (1) exports；One end of inductance l2 and the source terminal and two of switching tube q1
The cathode terminal of pole pipe d5 connects, and the other end of inductance l2 is connected with the anode tap of diode d6, the anode tap ground connection of diode d5,
The cathode terminal of diode d6 is connected with high-voltage power supply vcc_boost.
9. the driving current control circuit of diesel engine piezoelectric ceramics oil spout device according to claim 5, is characterized in that: described
Second processing device (8) includes cpld processor u4 and phase inverter u3, described phase inverter u3 and sampling threshold control circuit (4)
Outfan connects, and the outfan of phase inverter u3 is connected with the input of cpld processor u4, and cpld processor u4 also receives first
The radio frequency capture that processor (1) exports enables signal, and cpld processor u4 can trigger to latch (9) output services current control
Signal.
10. the driving current control circuit of diesel engine piezoelectric ceramics oil spout device according to claim 1, is characterized in that: institute
State sampling threshold process circuit (4) and include amplifier u6, the in-phase end of described amplifier u6 is connected with one end of resistance r2, amplify
The end of oppisite phase of device u6 is connected with one end of resistance r3 and one end of resistance r4, the other end ground connection of resistance r3, and resistance r4's is another
One end is connected with the outfan of amplifier u6 and one end of resistance r5, and resistance r5 passes through one end of resistance r10 and resistance r11 even
Connect, the other end of resistance r11 is connected with one end of one end, the end of oppisite phase of comparator u7 and resistance r12 of electric capacity c1, electric capacity c1
The other end be connected with one end of the in-phase end, one end of resistance r9 and resistance r8 of comparator u7, the other end of resistance r9 with
Da module (11) connects, and the other end of resistance r8 is connected with the collector terminal of audion q2, the emitter terminal ground connection of audion q2,
The base terminal of audion q2 is connected with one end of resistance r6 and one end of resistance r7, the other end ground connection of resistance r7；Resistance r12
The other end be connected with one end of the outfan, one end of resistance r13 and resistance r14 of comparator u7, the other end of resistance r13
It is connected with+3.3v voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410725730.8A CN104500298B (en) | 2014-12-03 | 2014-12-03 | Driving current control circuit of piezoelectric ceramic diesel injector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410725730.8A CN104500298B (en) | 2014-12-03 | 2014-12-03 | Driving current control circuit of piezoelectric ceramic diesel injector |
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| CN104500298B true CN104500298B (en) | 2017-01-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108386288B (en) * | 2018-02-24 | 2019-03-05 | 清华大学 | Fuel injector driving device |
| CN112746908B (en) * | 2021-01-15 | 2021-11-12 | 无锡职业技术学院 | Driving control system for high-pressure common-rail piezoelectric ceramic oil injector of diesel engine |
| CN114738152B (en) * | 2022-04-24 | 2024-03-19 | 一汽解放汽车有限公司 | Fuel injection system and control method thereof |
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| CN1125494A (en) * | 1993-06-18 | 1996-06-26 | 美国西门子汽车公司 | A system and method for operating high speed solenoid actuated devices |
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