CN104037880A - Driving piezoelectric injector device - Google Patents
Driving piezoelectric injector device Download PDFInfo
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- CN104037880A CN104037880A CN201410271506.6A CN201410271506A CN104037880A CN 104037880 A CN104037880 A CN 104037880A CN 201410271506 A CN201410271506 A CN 201410271506A CN 104037880 A CN104037880 A CN 104037880A
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Abstract
The invention relates to a driving piezoelectric injector device. A current feedback module monitors the current of a piezoelectric actuator in charging and discharging; a voltage feedback module monitors the voltage of the piezoelectric actuator in charging and is capable of regulating and controlling the high charging voltage and the discharging voltage of the piezoelectric actuator; an actuator medium consumption feedback control circuit regulates a charging threshold voltage; a capacitance gating compensation circuit compensates the capacitance of the piezoelectric actuator to prevent the medium consumption of the piezoelectric actuator influencing the work of the injector; an energy recycling circuit module recycles voltage from the voltage of the piezoelectric actuator and the transient high-voltage electric potential of an oil pump and is capable of pre-charging the piezoelectric actuator. The driving piezoelectric injector device is compact in structure, high in current control precision and capable of lowering the system consumption and improving the working stability and reliability of the injector under a complex working condition.
Description
Technical field
The present invention relates to a kind of circuit arrangement, especially a kind of driving piezoelectric type fuel injector device, specifically for the driving circuit device of piezo crystal common rail system fuel injector, belongs to the technical field of common rail for diesel engine system drive.
Background technology
The fuel injector of common rail system has two kinds of High-speed Electric magnetic-type formula and piezo crystal, the piezoelectric ceramic actuator of piezo crystal is due to its special piezoelectric effect and capacity effect, under certain high drive condition, can keep certain elongation, thereby can open fuel injector, realize oil spout function.At present, for the common rail system fuel injector of piezo crystal, system power dissipation is higher, and the dielectric loss of piezo crystal has impact to the work of fuel injector, is difficult to guarantee stability and the reliability of piezo crystal common rail system fuel injector work.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of driving piezoelectric type fuel injector device is provided, its compact conformation, Current Control precision is high, can reduce system power dissipation, under raising complex working condition, dielectric loss is to the stability of the work of fuel injector and reliability.
According to technical scheme provided by the invention, described driving piezoelectric type fuel injector device, comprises piezo actuator a plurality of and that connect; Described piezo actuator is connected with actuator driven circuit module, and described actuator driven circuit module comprises switching tube M2, switching tube M3 and the switching tube M4 consistent with piezo actuator quantity; The drain electrode of described switching tube M2 with for providing the output of the high pressure DCDC module of the required driving voltage of piezo actuator to be connected, the source terminal of switching tube M2 is connected with the drain electrode end of switching tube M3, the source terminal ground connection of switching tube M3, and the source terminal of switching tube M2 is connected with the first end of inductance L 2 with the drain electrode end of switching tube M3, the second end of inductance L 2 is connected with the high-pressure side of piezo actuator, and the low-pressure end of piezo actuator connects with the drain electrode end of corresponding switching tube M4;
The high-voltage charging signal of the gate terminal receive logic treatment circuit output of switching tube M2, the high-voltage discharging signal of the gate terminal receive logic treatment circuit output of switching tube M3, the gate terminal receive logic treatment circuit output of switching tube M4 select cylinder control signal;
The input of logic processing circuit is connected with the output of signal processor, and signal processor is also connected with current feedback module for detection of piezo actuator operating current and connects for detection of the Voltage Feedback module of the feedback sample voltage of piezo actuator; Current feedback module and Voltage Feedback module are also connected with the input of logic processing circuit, current feedback module regulates feedback signal and current protection feedback signal according to the operating current of piezo actuator to signal processor and logic processing circuit transmission current peak value, Voltage Feedback module is transmitted charging piezoelectricity pilot signal and discharge voltage pilot signal according to the feedback sample voltage of piezo actuator to signal processor, and Voltage Feedback module is to logic processing circuit transmission discharge voltage pilot signal;
Signal processor is according to the charging voltage of charging voltage pilot signal judgement piezo actuator, when the voltage at piezo actuator two ends reaches required operating voltage, logic processing circuit turn-offs high-voltage charging signal according to charging voltage pilot signal, and the high-voltage discharging signal that signal processor is exported by logic processing circuit makes by selecting the piezo actuator of cylinder control signal gating to enter discharge condition; Signal processor is according to the discharge voltage of discharge voltage pilot signal judgement piezo actuator, when the voltage at piezo actuator two ends reaches required discharge voltage, logic processing circuit turn-offs high-voltage discharging signal according to discharge voltage pilot signal, and signal processor selects next corresponding piezo actuator of cylinder control signal gating by logic processing circuit.
Described Voltage Feedback module comprises comparator 92A, comparator 92B and actuator dielectric loss feedback control circuit, the in-phase end of described comparator 92A is connected with charge threshold voltage V_ref1, the end of oppisite phase of comparator 92A is connected with feedback sample voltage, comparator 92A output charging voltage pilot signal, the end of oppisite phase of comparator 92B is connected with feedback sample voltage, the in-phase end of comparator 92B is connected with discharge threshold voltage V_ref2, comparator 92B output discharge voltage pilot signal;
Actuator dielectric loss feedback control circuit receives feedback sample voltage, when the voltage of determining piezo actuator two ends according to described feedback sample voltage is during lower than required operating voltage, actuator dielectric loss feedback control circuit can be to the dielectric loss compensation triggering signal of signal processor transmission, signal processor is according to dielectric loss compensation triggering signal to actuator dielectric loss feedback control circuit output charging voltage threshold value conditioning signal, and actuator dielectric loss feedback control circuit improves charge threshold voltage V_ref1 according to charging voltage threshold value conditioning signal.
Described signal processor is also connected with electric capacity gating compensating circuit, described electric capacity gating compensating circuit is attempted by the two ends of piezo actuator, and signal processor compensates the capacitance of piezo actuator according to the dielectric loss compensation triggering signal of actuator dielectric loss feedback control circuit output by electric capacity gating compensating circuit.
The high-pressure side of described piezo actuator is also connected with energy recovering circuit module, described energy recovering circuit module is connected with oil pump energy recycling module and signal processor, signal processor is connected with the control input end of oil pump energy recycling module, energy recovering circuit module also receives selects cylinder control signal, the energy of energy recovery when energy recovering circuit module is charged, discharged piezo actuator and the oil pump transient state high potential of oil pump energy recycling module reclaims, and energy recovering circuit module can be carried out precharge to the piezo actuator of next gating.
Described signal processor is also connected with the output of system short-circuit protective circuit; system short-circuit protective circuit is connected with high pressure DCDC module; system short-circuit protective circuit, can be to signal processor and logic processing circuit transmission system current protection triggering signal according to the system power value that detects high pressure DCDC module.
The source terminal of described switching tube M2 is connected with the anode tap of diode D4, the drain electrode end of the cathode terminal of diode D4 and switching tube M3, the anode tap of diode D2, the first end of the cathode terminal of diode D3 and inductance L 2 connects, the anode tap ground connection of diode D3, the second end of inductance L 2 and the anode tap of diode D6, the cathode terminal of diode D7 and the high-pressure side of piezo actuator connect, the anode tap ground connection of diode D7, the cathode terminal of diode D6 is connected with the cathode terminal of diode D2, the cathode terminal of the cathode terminal of diode D2 and diode D6 is connected with high pressure DCDC module.
The source terminal of described switching tube M4 is by resistance R 2 ground connection, and current feedback module is by being connected with the source terminal of switching tube M4, and by the sampling of 2 pairs of piezo actuator operating currents of resistance R; The high-pressure side of piezo actuator is connected with one end of resistance R 4, the other end of resistance R 4 is connected with the first end of resistance R 5, the second end ground connection of resistance R 5, the first end of resistance R 5 is connected with Voltage Feedback module, and Voltage Feedback module obtains feedback sample voltage by resistance R 5.
Described high pressure DCDC module comprises switching tube M1, the source terminal ground connection of switching tube M1, the drain electrode end of switching tube M1 is connected with one end of inductance L 1 and the anode tap of diode D1, the gate terminal of switching tube M1 is connected with the output of DCDC circuit, the other end of inductance L 1 is connected with voltage VBAT, the cathode terminal of diode D1 is connected with the drain electrode end of switching tube M2 and one end of capacitor C 1, and the other end of capacitor C 1 is by resistance R 1 ground connection.
Described current feedback module comprises the second amplifying circuit, and the output of described the second amplifying circuit is connected with the second comparison circuit, the 3rd comparison circuit, and the 3rd comparison circuit is connected with the second trigger holding circuit; The output of the second comparison circuit regulates feedback signal to signal processor and logic processing circuit transmission current peak value, and trigger holding circuit is to signal processor and logic processing circuit transmission current protection feedback signal.
Described actuator dielectric loss feedback control circuit comprises operational amplifier 94B and triode Q1, the anode tap of the in-phase end of described operational amplifier 94B and diode D16, one end of the cathode terminal of diode D17 and resistance R 6 connects, the other end of resistance R 6 is connected with feedback sampling circuit, the cathode terminal of diode D16 is connected with voltage V_ref, the anode tap ground connection of diode D17, the end of oppisite phase of operational amplifier 94B is connected with the output of operational amplifier 94B, the output output medium loss balancing triggering signal of operational amplifier 94B, the base terminal of triode Q1 is connected with the charging voltage threshold value conditioning signal of signal processor output, the base terminal of triode Q1 is also connected with one end of resistance R 7 and one end of resistance R 9, the emitter terminal of triode Q1 is by resistance R 10 ground connection, the collector terminal of triode Q1 is connected with voltage V_ref by resistance R 8, the other end of resistance R 7 is connected with voltage V_ref, the other end of resistance R 9 is by resistance R 10 ground connection, the collector terminal of triode Q1 is connected with the in-phase end of comparator 92B.
Described electric capacity gating compensating circuit comprises triode Q2, the collector terminal of triode Q2 is connected with the output of signal processor by the first boostrap circuit, the emitter terminal of triode Q2 is respectively by resistance R 13, capacitor C 3 ground connection, the earth terminal ground connection of the first boostrap circuit, the collector terminal of triode Q2 is connected with one end of resistance R 12 and the anode tap of diode D18, the cathode terminal of diode D18 is connected with the other end of resistance R 12, and the cathode terminal of diode D18 and the high-pressure side of piezo actuator are connected.
Described oil pump energy recycling module comprises switching tube M5 and switching tube M6, the source terminal ground connection of described switching tube M5, the drain electrode end of switching tube M5 is connected with the anode tap of diode D5 and one end of inductance L 3, the other end of inductance L 3 is connected with voltage VBAT, the cathode terminal of diode D5 is connected with energy recovering circuit module, and the gate terminal of switching tube M5 reclaims control signal for receiving the first oil pump energy of signal processor output; The gate terminal of switching tube M6 reclaims control signal for receiving the second oil pump energy of signal processor output, the source terminal ground connection of switching tube M6, the drain electrode end of switching tube M6 is connected with the cathode terminal of diode D8, and the anode tap of diode D8 is connected with the high-pressure side of piezo actuator by resistance R 11.
Described energy recovering circuit module comprises logical AND device 95B, the input of described logical AND device 95B receives the pre-arcing signal that selects cylinder control signal and signal processor output, the output of logical AND device 95B is connected with the input of the second boostrap circuit, the output of the second boostrap circuit is connected with the gate terminal of switching tube M7, the source terminal of switching tube M7 is connected with the anode tap of diode D9 anode tap and diode D10, the drain electrode end of switching tube M7 is connected with the cathode terminal of diode D11, the anode tap of diode D11 is connected with the high-pressure side of piezo actuator, the anode tap of diode D9, the equal ground connection of earth terminal of the anode tap of diode D10 and the second boostrap circuit, the cathode terminal of the cathode terminal of diode D9, diode D10 is connected with the cathode terminal of diode D12 and one end of inductance L 4, the anode tap of diode D12 is connected with oil pump energy recycling module, the other end of inductance L 4 is connected with one end of capacitor C 2 and the anode tap of diode D13, the other end ground connection of capacitor C 2, the cathode terminal of diode D13 is connected with the drain electrode end of switching tube M8, the source terminal of switching tube M8 is connected with the anode tap of diode D14 and the anode tap of diode D15, the gate terminal of switching tube M8 is connected with the output of the 3rd boostrap circuit, the input of the 3rd boostrap circuit is connected with the precharging signal of signal processor output, the cathode terminal of diode D14 is connected with the cathode terminal of diode D15, the equal ground connection of earth terminal of the anode tap of the anode tap of diode D14, diode D15 and the 3rd boostrap circuit.
Described system short-circuit protective circuit comprises the first amplifying circuit; the input of described the first amplifying circuit is connected with high pressure DCDC module; the first amplifying circuit is connected with the first trigger holding circuit by the first comparison circuit, and the first trigger holding circuit is to signal processor and logic processing circuit transmission system current protection triggering signal.
Described logic processing circuit comprises logical AND circuit U 1A, logical AND circuit U 1B, logical AND circuit U 1C, logical AND circuit U 3C, logical AND circuit U 4A, logical AND circuit U 2B and 138 decoders;
The input of logical AND circuit U 1A receives the charging control signal of signal processor transmission and the charging voltage pilot signal of Voltage Feedback module transmission, input received current protection feedback signal and the current peak of logical AND circuit U 1C regulate feedback signal, the input of logical AND circuit U 1B is connected with the output of logical AND circuit U 1A and the output of logical AND circuit U 1C, the output output high-voltage charging signal of logical AND circuit U 1B;
The input of logical AND circuit U 3C receives discharge voltage pilot signal and discharge control signal, the input receiving system current protection triggering signal of logical AND circuit U 4A, current peak regulate feedback signal and current protection feedback signal, the input of logical AND circuit U 2B is connected with the input of logical AND circuit U 3C and logical AND circuit U 4A, the output output high-voltage discharging signal of logical AND circuit U 2B;
The fuel injector that the input of 138 decoders receives signal processor transmission drives signal, and drives signal output to select cylinder control signal according to fuel injector.
Advantage of the present invention: by current feedback module, piezo actuator is carried out the current monitoring of charge and discharge process, by Voltage Feedback module, the voltage in the charging process of piezo actuator is monitored, high pressure when Voltage Feedback module can be to the charging of piezo actuator, voltage during electric discharge regulates control, can also regulate charge threshold voltage by actuator dielectric loss feedback control circuit, and by electric capacity gating compensating circuit, the electric capacity of piezo actuator is compensated, the impact of the dielectric loss of avoiding piezo actuator on fuel injector work, by energy recovering circuit module, the voltage of piezo actuator and oil pump high voltage transient electromotive force are carried out to voltage recovery, and can carry out precharge to piezo actuator, compact conformation, Current Control precision is high, can reduce system power dissipation, under raising complex working condition, dielectric loss is to the stability of the work of fuel injector and reliability.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 regulates the circuit theory diagrams of part for multilevel voltage in actuator dielectric loss feedback control circuit of the present invention.
Fig. 3 compensates the circuit theory diagrams of triggering signal for generation of dielectric loss in actuator dielectric loss feedback control circuit of the present invention.
Fig. 4 is the circuit theory diagrams of electric capacity gating compensating circuit of the present invention.
Fig. 5 is the circuit theory diagrams of energy recovering circuit module of the present invention.
Fig. 6 is for generation of the circuit theory diagrams of high-voltage charging signal in logic processing circuit of the present invention.
Fig. 7 is for generation of the circuit theory diagrams of high-voltage discharging signal in logic processing circuit of the present invention.
Fig. 8 is for generation of the circuit theory diagrams that select cylinder control signal in logic processing circuit of the present invention.
Fig. 9 is signal timing diagram of the present invention.
Figure 10 is the drive waveforms figure of ideal situation.
Figure 11 is the drive waveforms figure of piezo actuator in dielectric loss situation.
Figure 12 is drive waveforms figure of the present invention.
Description of reference numerals: 1-high pressure DCDC module, 2-oil pump energy recycling module, 3-actuator driven circuit module, 4-current feedback module, 5-Voltage Feedback module, 6-system short-circuit protective circuit, 7-DCDC circuit, 8-the first amplifying circuit, 9-the first comparison circuit, 10-the first trigger holding circuit, 11-the second amplifying circuit, 12-the second comparison circuit, 13-the 3rd comparison circuit, 14-the second trigger holding circuit, 15-signal processor, 16-logic processing circuit, 17-the first boostrap circuit, 18-the second boostrap circuit, 19-the 3rd boostrap circuit and 20-138 decoder.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 1: in order controling effectively to the course of work of piezo actuator 91, to reduce system power dissipation, under reduction complex working condition, due to the impact of dielectric loss on fuel injector, to the present invention includes piezo actuator 91 a plurality of and that connect; Described piezo actuator 91 is connected with actuator driven circuit module 3, and described actuator driven circuit module 3 comprises switching tube M2, switching tube M3 and the switching tube M4 consistent with piezo actuator 91 quantity; The drain electrode of described switching tube M2 with for providing the output of the high pressure DCDC module 1 of piezo actuator 91 required driving voltages to be connected, the source terminal of switching tube M2 is connected with the drain electrode end of switching tube M3, the source terminal ground connection of switching tube M3, and the source terminal of switching tube M2 is connected with the first end of inductance L 2 with the drain electrode end of switching tube M3, the second end of inductance L 2 is connected with the high-pressure side of piezo actuator 91, and the low-pressure end of piezo actuator 91 connects with the drain electrode end of corresponding switching tube M4;
The high-voltage charging signal 61 of gate terminal receive logic treatment circuit 16 outputs of switching tube M2, the high-voltage discharging signal 62 of gate terminal receive logic treatment circuit 16 output of switching tube M3, gate terminal receive logic treatment circuit 16 outputs of switching tube M4 select cylinder control signal 63;
The input of logic processing circuit 16 is connected with the output of signal processor 15, and signal processor 15 is also connected with current feedback module 4 for detection of piezo actuator 91 operating currents and connects for detection of the Voltage Feedback module 5 of the feedback sample voltage of piezo actuator 91; Current feedback module 4 and Voltage Feedback module 5 are also connected with the input of logic processing circuit 16, current feedback module 4 regulates feedback signal 82 and current protection feedback signal 83 according to the operating current of piezo actuator 91 to signal processor 15 and logic processing circuit 16 transmission current peak values, Voltage Feedback module 5 is transmitted charging piezoelectricity pilot signal 84 and discharge voltage pilot signals 85 according to the feedback sample voltage of piezo actuator 91 to signal processor 15, and Voltage Feedback module 5 is to logic processing circuit 16 transmission discharge voltage pilot signals 85;
Signal processor 15 is according to the charging voltage of charging voltage pilot signal 84 judgement piezo actuators 91, when the voltage at piezo actuator 91 two ends reaches required operating voltage, logic processing circuit 16 turn-offs high-voltage charging signal 61 according to charging voltage pilot signal 84, and the high-voltage discharging signal 62 that signal processor 15 is exported by logic processing circuit 16 makes by selecting the piezo actuator 91 of cylinder control signal 63 gatings to enter discharge condition; Signal processor 15 is according to the discharge voltage of discharge voltage pilot signal 85 judgement piezo actuators 91, when the voltage at piezo actuator 91 two ends reaches required discharge voltage, logic processing circuit 16 turn-offs high-voltage discharging signals 62 according to discharge voltage pilot signal 85, and signal processor 15 selects next corresponding piezo actuator 91 of cylinder control signal 63 gatings by logic processing circuit 16.
Particularly, the source terminal of described switching tube M2 is connected with the anode tap of diode D4, the drain electrode end of the cathode terminal of diode D4 and switching tube M3, the anode tap of diode D2, the first end of the cathode terminal of diode D3 and inductance L 2 connects, the anode tap ground connection of diode D3, the second end of inductance L 2 and the anode tap of diode D6, the high-pressure side of the cathode terminal of diode D7 and piezo actuator 91 connects, the anode tap ground connection of diode D7, the cathode terminal of diode D6 is connected with the cathode terminal of diode D2, the cathode terminal of the cathode terminal of diode D2 and diode D6 is connected with high pressure DCDC module 1.The TV of paying producing when piezo actuator 91 is charged by diode D3 is done absorption circuit effect, and the anodic bonding ground wire of diode D7, plays the effect of afterflow.
In the embodiment of the present invention, high-voltage charging signal 61 carrys out the switch of driving switch pipe M2, to control the driving voltage that whether loads 1 output of high pressure DCDC module, through 2 pairs of piezo actuators 91 of inductance L, charge, utilize inductance L 2 as the bridge discharging and recharging, to slow down, discharge and recharge the impact of peak current to piezo actuator 91, thus reach fast and stable piezo actuator 91 is discharged and recharged to the object of control.By electric current, voltage in the discharging and recharging of circuit feedback module 4 and 5 pairs of piezo actuators 91 of Voltage Feedback module, monitor, with the voltage, electric current of guaranteeing piezo actuator 91 charge and discharge process all in safe range.Usually, in fuel injector common rail system, comprise four ~ six piezo actuators 91, therefore, the switching tube M4 that will comprise same quantity in circuit, by switching tube M2, with corresponding switching tube M4 realization, the piezo actuator 91 of gating is charged, by switching tube M3, with corresponding switching tube M4 realization, the piezo actuator 91 of gating is discharged.
The source terminal of described switching tube M4 is by resistance R 2 ground connection, and current feedback module 4 is by being connected with the source terminal of switching tube M4, and by the sampling of 2 pairs of piezo actuator 91 operating currents of resistance R; The high-pressure side of piezo actuator 91 is connected with one end of resistance R 4, the other end of resistance R 4 is connected with the first end of resistance R 5, the second end ground connection of resistance R 5, the first end of resistance R 5 is connected with Voltage Feedback module 5, and Voltage Feedback module 5 obtains feedback sample voltage by resistance R 5.When having a plurality of switching tube M4, the source terminal of each switching tube M4 is all by same resistance R 2 ground connection, so current feedback module 4 is realized the charge and discharge process of the piezo actuator 91 of different gatings is carried out to current sample by resistance R 2.In the embodiment of the present invention, the voltage of resistance R 5 first ends is feedback sample voltage.
Further, described Voltage Feedback module 5 comprises comparator 92A, comparator 92B and actuator dielectric loss feedback control circuit B, the in-phase end of described comparator 92A is connected with charge threshold voltage V_ref1, the end of oppisite phase of comparator 92A is connected with feedback sample voltage, comparator 92A output charging voltage pilot signal 84, the end of oppisite phase of comparator 92B is connected with feedback sample voltage, the in-phase end of comparator 92B is connected with discharge threshold voltage V_ref2, comparator 92B output discharge voltage pilot signal 85;
Actuator dielectric loss feedback control circuit B receives feedback sample voltage, when the voltage of determining piezo actuator 91 two ends according to described feedback sample voltage is during lower than required operating voltage, actuator dielectric loss feedback control circuit B can be to the dielectric loss compensation triggering signal 86 of signal processor 15 transmission, signal processor 15 is exported charging voltage threshold value conditioning signal 87 according to dielectric loss compensation triggering signal 86 to actuator dielectric loss feedback control circuit B, actuator dielectric loss feedback control circuit B improves charge threshold voltage V_ref1 according to charging voltage threshold value conditioning signal 87.
Described charge threshold voltage V_ref1, discharge threshold voltage V_ref2 all obtain by normal voltage V_ref, be generally+5V of normal voltage V_ref.Comparator 92A is according to the magnitude relationship output charging voltage pilot signal 84 between feedback sample voltage and charge threshold voltage V_ref1, and comparator 92B exports discharge voltage pilot signal 85 according to the size between feedback sample voltage and discharge threshold voltage V_ref2.In the embodiment of the present invention, the size by charge threshold voltage V_ref1, discharge threshold voltage V_ref2 regulates the charging voltage at piezo actuator 91 two ends and the size of discharge voltage, guarantees the effective control to piezo actuator 91 charge and discharge processes.By actuator dielectric loss feedback control circuit B, improving charge threshold voltage V_ref1 realizes the multilevel threshold in piezo actuator 91 charging processes is controlled.
As shown in Figures 2 and 3, described actuator dielectric loss feedback control circuit B comprises operational amplifier 94B and triode Q1, the anode tap of the in-phase end of described operational amplifier 94B and diode D16, one end of the cathode terminal of diode D17 and resistance R 6 connects, the other end of resistance R 6 is connected with feedback sampling circuit, the cathode terminal of diode D16 is connected with voltage V_ref, the anode tap ground connection of diode D17, the end of oppisite phase of operational amplifier 94B is connected with the output of operational amplifier 94B, the output output medium loss balancing triggering signal 86 of operational amplifier 94B, the base terminal of triode Q1 is connected with the charging voltage threshold value conditioning signal 87 of signal processor 15 outputs, the base terminal of triode Q1 is also connected with one end of resistance R 7 and one end of resistance R 9, the emitter terminal of triode Q1 is by resistance R 10 ground connection, the collector terminal of triode Q1 is connected with voltage V_ref by resistance R 8, the other end of resistance R 7 is connected with voltage V_ref, the other end of resistance R 9 is by resistance R 10 ground connection, the collector terminal of triode Q1 is connected with the in-phase end of comparator 92B.
In the embodiment of the present invention, resistance R 6 is connected with the first end of resistance R 5, to realize being connected of resistance R 6 and feedback sampling circuit, operational amplifier 94B forms voltage follower, signal processor 15 turn-offs triode Q1 according to the dielectric loss compensation triggering signal 86 of operational amplifier 94B output output, when closing, triode Q1 has no progeny, can improve charge threshold voltage V_ref1, improve after charge threshold voltage V_ref1 voltage, can improve the voltage at piezo actuator 91 two ends, improve the driving voltage of 91 pairs of fuel injectors of piezo actuator.In the embodiment of the present invention, signal processor 15 can adopt conventional micro-chip processor.
Under complex working condition, when the dielectric loss of piezo actuator 91 is serious, the voltage at piezo actuator 91 two ends can be lower than set point, for fear of the work that affects fuel injector, described signal processor 15 is also connected with electric capacity gating compensating circuit A, described electric capacity gating compensating circuit A is attempted by the two ends of piezo actuator 91, and signal processor 15 compensates the capacitance of piezo actuator 91 according to the dielectric loss compensation triggering signal 86 of actuator dielectric loss feedback control circuit B output by electric capacity gating compensating circuit A.Electric capacity gating compensating circuit A is connected with the high-pressure side of piezo actuator 91 by resistance R 3.
As shown in Figure 5, described electric capacity gating compensating circuit A comprises triode Q2, the collector terminal of triode Q2 is connected with the output of signal processor 15 by the first boostrap circuit 17, the emitter terminal of triode Q2 is respectively by resistance R 13, capacitor C 3 ground connection, the earth terminal ground connection of the first boostrap circuit 17, the collector terminal of triode Q2 is connected with one end of resistance R 12 and the anode tap of diode D18, the cathode terminal of diode D18 is connected with the other end of resistance R 12, and the cathode terminal of diode D18 is connected with the high-pressure side of piezo actuator 91.Particularly, the cathode terminal of diode D18 is connected with the high-pressure side of piezo actuator 91 by resistance R 3.
During concrete enforcement, boostrap circuit is booster circuit, utilizes Bootstrap diode, and the electronic components such as Bootstrap electric capacity make capacitor discharge voltage and supply voltage stack, thereby voltage is raise; In the embodiment of the present invention, the first boostrap circuit 17, the second boostrap circuit 18 and the 3rd boostrap circuit 19 all adopt existing circuit structure, when the first boostrap circuit 17 is connected with the output of signal processor 15, drive after triode Q2 conducting, gating capacitor C 3, make 91 of capacitor C 3 and piezo actuators set up a shunt circuit, by capacitor C 3, compensate the capacitance in whole circuit, the impact of the dielectric loss that has solved piezo actuator 91 on fuel injector work.
The high-pressure side of described piezo actuator 91 is also connected with energy recovering circuit module C, described energy recovering circuit module C is connected with oil pump energy recycling module 2 and signal processor 15, signal processor 15 is connected with the control input end of oil pump energy recycling module 2, energy recovering circuit module C also receives and selects cylinder control signal 63, energy recovering circuit module C is to piezo actuator 91 chargings, the energy of energy recovery during electric discharge and the oil pump transient state high potential of oil pump energy recycling module 2 reclaims, energy recovering circuit module C can carry out precharge to the piezo actuator 91 of next gating.
Piezo actuator 91 is capacitance characteristic, and the recycling that oil pump energy recycling module 2 refers to the voltage of the inductance characteristic of oil pump utilizes energy recovering circuit module C the voltage of the transient state high potential of the voltage of capacitance characteristic and oil pump to reclaim simultaneously.
Described oil pump energy recycling module 2 comprises switching tube M5 and switching tube M6, the source terminal ground connection of described switching tube M5, the drain electrode end of switching tube M5 is connected with the anode tap of diode D5 and one end of inductance L 3, the other end of inductance L 3 is connected with voltage VBAT, the cathode terminal of diode D5 is connected with energy recovering circuit module C, and the gate terminal of switching tube M5 reclaims control signal 64 for receiving the first oil pump energy of signal processor 15 outputs; The gate terminal of switching tube M6 reclaims control signal 65 for receiving the second oil pump energy of signal processor 15 outputs, the source terminal ground connection of switching tube M6, the drain electrode end of switching tube M6 is connected with the cathode terminal of diode D8, and the anode tap of diode D8 is connected with the high-pressure side of piezo actuator 91 by resistance R 11.
As shown in Figure 5, described energy recovering circuit module C comprises logical AND device 95B, the input of described logical AND device 95B receives the pre-arcing signal 89 that selects cylinder control signal 63 and signal processor 15 outputs, the output of logical AND device 95B is connected with the input of the second boostrap circuit 18, the output of the second boostrap circuit 18 is connected with the gate terminal of switching tube M7, the source terminal of switching tube M7 is connected with the anode tap of diode D9 anode tap and diode D10, the drain electrode end of switching tube M7 is connected with the cathode terminal of diode D11, the anode tap of diode D11 is connected with the high-pressure side of piezo actuator 91, the anode tap of diode D9, the equal ground connection of earth terminal of the anode tap of diode D10 and the second boostrap circuit 18, the cathode terminal of the cathode terminal of diode D9, diode D10 is connected with the cathode terminal of diode D12 and one end of inductance L 4, the anode tap of diode D12 is connected with oil pump energy recycling module 2, the other end of inductance L 4 is connected with one end of capacitor C 2 and the anode tap of diode D13, the other end ground connection of capacitor C 2, the cathode terminal of diode D13 is connected with the drain electrode end of switching tube M8, the source terminal of switching tube M8 is connected with the anode tap of diode D14 and the anode tap of diode D15, the gate terminal of switching tube M8 is connected with the output of the 3rd boostrap circuit 19, the input of the 3rd boostrap circuit 19 is connected with the precharging signal 88 of signal processor 15 outputs, the cathode terminal of diode D14 is connected with the cathode terminal of diode D15, the equal ground connection of earth terminal of the anode tap of the anode tap of diode D14, diode D15 and the 3rd boostrap circuit 19.
At the beginning of piezo actuator 91 chargings, open storage capacitor C2, utilize the electrical potential difference recuperated energy of capacitor C 2 and piezo actuator 91, guarantee that together with voltage feedback circuit 5 voltage of piezo actuator 91 remains between 24V～40V.When recuperated energy is during higher than desired value, signal processor 15 is controlled and is reclaimed control signal 65 and open switching tube M6 by the second oil pump energy, sets up bleed-off circuit, and what guarantee piezo actuator 91 rushes voltage in advance.Diode D5 guarantees that the reverse cut-off of high voltage does not affect the work of oil pump, by electric discharge logic control with select cylinder control signal 63 to come the switch of control switch pipe M7 to select state to select the recovery of piezo actuator 91 discharge energies.The high-pressure side that diode D11 anode connects piezo actuator 91 connects, and the energy of capacitor C 2, by selecting the switch of cylinder control signal 63 control switch pipe M8, carries out rechargeable energy recovery to piezo actuator 91.
Described signal processor 15 is also connected with the output of system short-circuit protective circuit 6; system short-circuit protective circuit 6 is connected with high pressure DCDC module 1; system short-circuit protective circuit 6, can be to signal processor 15 and logic processing circuit 16 transmission system current protection triggering signals 81 according to the system power value that detects high pressure DCDC module 1.
Described system short-circuit protective circuit 6 comprises the first amplifying circuit 8; the input of described the first amplifying circuit 8 is connected with high pressure DCDC module 1; the first amplifying circuit 8 is connected with the first trigger holding circuit 10 by the first comparison circuit 9, and the first trigger holding circuit 10 is to signal processor 15 and logic processing circuit 16 transmission system current protection triggering signals 81.
Described high pressure DCDC module 1 comprises switching tube M1, the source terminal ground connection of switching tube M1, the drain electrode end of switching tube M1 is connected with one end of inductance L 1 and the anode tap of diode D1, the gate terminal of switching tube M1 is connected with the output of DCDC circuit 7, the other end of inductance L 1 is connected with voltage VBAT, the cathode terminal of diode D1 is connected with the drain electrode end of switching tube M2 and one end of capacitor C 1, and the other end of capacitor C 1 is by resistance R 1 ground connection.
The driving of piezo actuator 91 needs higher driving voltage, and high pressure DCDC module 1 provides essential 200V high pressure, and wherein the switch of switching tube M1 makes the reverse potential of inductance L 1 to capacitor C 1 charging, guarantees the needed high pressure of piezo actuator 91.Be generally+24V of voltage VBAT.
Owing to giving basic structure that piezo actuator 91 discharges and recharges, it is all the high pressure that the capacitor C 1 by high pressure DCDC module 1 provides, the sample rate current of the resistance R 1 being therefore connected with capacitor C 1 low side is exactly the sampled point of system power, after systematic sampling current signal being amplified by the first amplifying circuit 8, import the first comparison circuit 9 into, in the first comparison circuit 9 with set secure threshold comparison, as 3A while setting secure threshold, after reaching 3A, trigger the first trigger holding circuit 10, make the first trigger holding circuit 10 to signal processor 15 output system current protection triggering signals 81, signal processor 15 can protect triggering signal 81 to carry out accumulated counts to system power, after reaching and setting time, think that system is in abnormality, close all drivings.Certainly, signal processor 15 also can protect triggering signal 81 directly to close all drivings according to system power, guarantees the safety of whole circuit.
Described current feedback module 4 comprises the second amplifying circuit 11, and the output of described the second amplifying circuit 11 is connected with the second comparison circuit 12, the 3rd comparison circuit 13, and the 3rd comparison circuit 13 is connected with the second trigger holding circuit 14; The output of the second comparison circuit 12 regulates feedback signal 82 to signal processor 15 and logic processing circuit 16 transmission current peak values, and trigger holding circuit 14 is to signal processor 15 and logic processing circuit 16 transmission current protection feedback signals 83.
In the embodiment of the present invention, signal processor 15 output packets are containing the charging control signal 70 of PWM modulation intelligence, charging process by 70 pairs of piezo actuators 91 of charging control signal is carried out coarse adjustment, then by the drive current of sampling resistor R2 sampling piezo actuator 91, after amplifying by 11 pairs of electric currents of the second amplifying circuit, through the second comparison circuit 12 and the comparison of setting peak current, output current peak value regulates feedback signal 82, make signal processor 15 regulate the work of 82 pairs of piezo actuators 91 of feedback signal to carry out PWM adjusting according to current peak, control the peak value waveform of drive current.Electric current after the second amplifying circuit 11 amplifies and the current threshold comparison of the 3rd comparison circuit 13; guarantee the maximum safe current of charging and discharging circuit; if surpassed, set safety electric flow valuve; trigger the second trigger holding circuit 14; by the second trigger holding circuit 14 output current protection feedback signals 83; maximum charge-discharge circuit by signal processor 15 and 16 pairs of piezo actuators 91 of logic processing circuit carries out fine tuning, realizes the charge and discharge process of piezo actuator 91 is control effectively.
As shown in Fig. 6, Fig. 7 and Fig. 8, described logic processing circuit 16 comprises logical AND circuit U 1A, logical AND circuit U 1B, logical AND circuit U 1C, logical AND circuit U 3C, logical AND circuit U 4A, logical AND circuit U 2B and 138 decoders 20;
The input of logical AND circuit U 1A receives the charging control signal 70 of signal processor 15 transmission and the charging voltage pilot signal 84 of Voltage Feedback module 5 transmission, input received current protection feedback signal 83 and the current peak of logical AND circuit U 1C regulate feedback signal 82, the input of logical AND circuit U 1B is connected with the output of logical AND circuit U 1A and the output of logical AND circuit U 1C, the output output high-voltage charging signal 61 of logical AND circuit U 1B;
The input of logical AND circuit U 3C receives discharge voltage pilot signal 85 and discharge control signal 68, the input receiving system current protection triggering signal 81 of logical AND circuit U 4A, current peak regulate feedback signal 82 and current protection feedback signal 83, the input of logical AND circuit U 2B is connected with the input of logical AND circuit U 3C and logical AND circuit U 4A, the output output high-voltage discharging signal 62 of logical AND circuit U 2B;
The fuel injector that the input of 138 decoders 20 receives signal processor 15 transmission drives signal 69, and drives signal 69 outputs to select cylinder control signal 63 according to fuel injector.
Signal processor 15 sends charging control signal 70, carries out logical AND with the charging voltage pilot signal 84 of comparator 92A output by logical AND circuit U 1A; Current protection feedback signal 83, current peak regulate feedback signal 82 to carry out logical AND by logical AND circuit U 1C, and logical AND circuit U 1B carries out logical AND to the output signal of logical AND circuit U 1A and logical AND circuit U 1C, obtains high-voltage charging signal 61.In like manner; discharge voltage pilot signal 85 carries out logical AND with the discharge control signal 68 of signal processor 15 outputs by logical AND circuit U 3C; logical AND circuit U 4A regulates feedback signal 82 and current protection feedback signal 83 to carry out logical AND to system power protection triggering signal 81, current peak; logical AND circuit U 2B to the output signal of logical AND circuit U 3C and logical AND circuit the output signal of U4A carry out logical AND, obtain high-voltage discharging signal 62.Signal processor 15 output fuel injectors drive signals 69, by 138 decoders 20, carry out decoding after output select cylinder control signal 63.
In the embodiment of the present invention, charging control signal 70 drives signal 69 by signal processor 15 program compilations with discharge control signal 68, fuel injector, and determine sequencing by signal processor 15, logical relation is: the interval time between charging control signal 70 and discharge control signal 68, be fuel injector opening time, add the effective time of discharge control signal 68 effective time of charging control signal 70, add interval time, be the driving signal time that fuel injector drives signal 69.
As shown in Figure 9, utilize sequential chart to be described further the course of work of the present invention, t0 initialization constantly, t1 selects cylinder control signal 63 to start effectively constantly, signal processor 15 comes into effect precharging signal 88, by the capacitor C of energy recycling module the inside 2 voltage guiding piezo actuators 91, realize precharge; When the voltage of capacitor C 2 voltages when the t2 and piezo actuator 91 is consistent, close precharging signal 88.For System Safety Guarantee, t3 is arrived at interval for a moment, and signal processor 15 sends charging control signal 70, and the charging that realizes basic PWM enables; In logic processing circuit 16, carry out generating high-voltage charging signal 61 to t4 after logical process; T4 is fuel injector driving time during t5, and t5 starts to close fuel injector, and to capacitor C 2 electric discharges of energy recovering circuit module C, pre-arcing signal 89 enables, and during to t6, capacitor C 2 both end voltage are consistent, close pre-arcing signal 89.And open discharge control signal 68, at the interior generation high-voltage discharging signal 62 of logic processing circuit 16, realize electric discharge over the ground.To t7, complete electric discharge, i.e. one-period.Particularly:
1), t after powering on
0~ t
1in time, after signal processor 15 powers on, except high-voltage charging signal 61, high-voltage discharging signal 62, select cylinder control signal 63 hardware to remain in disarmed state, other signals carry out normal initialization.Within this time period, start selecting cylinder control signal 63 to start timing, be each signal processor 15 while powering on software read the charging fuel injector sequence number in Flash memory, when elected cylinder control signal 63 is effective, corresponding piezo actuator 91 carries out initial charge, during signal processor 15 power-off, charge fuel injector, sequence number increases progressively quantity one, and is kept in the Flash memory of signal processor 15.
2), complete t
0~ t
1power-up initializing after, t
1~ t
2it in section, is the process that first the storage capacitor C2 of energy recovering circuit module 2 carries out precharge to piezo actuator 91, several impulse durations before powering on, because the voltage that energy reclaims is limited, therefore not high to the pre-charge pressure of piezo actuator 91, after the logic judgement of energy recovering circuit module C, enter high-voltage power supply charging interval section, in t3 ~ t4 section, piezo actuator 91 is charged and is remained to t by the high terminal voltage of high pressure DCDC module 1
4, switching tube M2 is effective during this period of time, and the high-voltage power supply of high pressure DCDC module 1 starts piezo actuator 91 chargings by selecting cylinder control signal 63 gatings.
Current feedback module 4 and Voltage Feedback module 5 enter monitoring mode, if actuator dielectric loss feedback control circuit B does not trigger, the charging voltage of 5 pairs of piezo actuators 91 of Voltage Feedback module is monitored.The charging control signal 70 of being exported by signal processor 15 and the mediation effect of high-voltage charging signal 61, the charging of piezo actuator 91 is in gradual rising, in conjunction with the feedback effects of current feedback module 4, the charging current peak value of piezo actuator 91 is controlled to safe scope.At high-voltage charging signal 61 to time t
2while closing, Voltage Feedback module 5 is always in the monitoring state, if the voltage at 61 upsets of high-voltage charging signal and piezo actuator 91 two ends is lower than desired value, 15 of signal processors form high pressure by high-voltage charging signal 61 and maintain signal, make high pressure maintain signal and extend to t
5, but note keeping certain Dead Time (t5 ~ t6) with section discharge time, now actuator dielectric loss feedback control circuit B starts effect, revises the impact of the dielectric loss of piezo actuator 91.And at original oil mass MAP table, add calibrated error value, thereby guarantee that piezo actuator 91 drives the accuracy of corresponding distributive value.If piezo actuator 91 both end voltage are all the time lower than predetermined value, actuator dielectric loss feedback control circuit B can pass through signal processor 15 gating electric capacity gating compensating circuit A, electric capacity to piezo actuator 91 compensates, improve the capacitance of whole circuit, and improve charge threshold voltage V_ref1, slightly improve the voltage at piezo actuator 91 two ends.
3), when arriving t
5time, piezo actuator 91 starts electric discharge.Now, open pre-arcing signal 89, switching tube M2 closes, and switching tube M7 opens, and selects cylinder control signal 63 still effective, and 91 couples of middle storage capacitor C2 of piezo actuator start electric discharge.When the electrical potential difference of 91 of storage capacitor C2 and piezo actuators is less than 0.7V left and right, close energy recovering circuit module C; T6～t7 high-voltage discharging signal 62 is effective, and switching tube M3 opens, and piezo actuator 91 discharges over the ground, finishes driving process.From t
1to t
7be exactly the driving time of piezo actuator 91 during this period of time, namely fuel injector opening time, i.e. fuel injection pulsewidth.In this cycle, the cylinder control signal 63 of selecting of other fuel injectors is low level, makes corresponding fuel injector keep vacant state.
4), at t
6～t
7in time, high-voltage discharging signal 62 is effective, and the interior monitoring of the electric discharge to piezo actuator 91 of voltage feedback circuit 5, in effective status, makes discharge voltage remain on 24V left and right over the ground and closes high-voltage discharging signal 62.When the actuator driven of next sequence number starts, the driving voltage of piezo actuator 91 is directly lifted to 200V from the voltage sum of 24V and recuperated energy circuit module C, is conducive to the switching speed of piezo actuator 91, thereby is conducive to the multi-injection action of fuel injector.To t
7time select cylinder control signal 63 to close, complete injection process one time.
5), at t
7～t
8in time, diagram fuel injector is in by state, but be during this period of time in other fuel injector one in work, by selecting cylinder control signal 63 to control, guarantee the breakdown action of each cycle in a fuel injector.Other fuel injectors, when vacant state, keep loop state by corresponding resistance R 3, to guarantee the gating work next time of preparing.
6), duration of work, collect the reverse potential of energy storage inductor, by energy recovering circuit C, energy is temporarily stored in energy recycling module C2 electric capacity, for the precharge stroke of next actuator is prepared.
Figure 10 is that piezo actuator 91 drives ideal waveform, and t100 completes the foundation of charging high pressure in the time, and charging voltage signal is closed, and high pressure remains on predetermined state, and t100 is to being the fuel injection pulsewidth time between t200.Yet the in the situation that of dielectric loss, do not add and drive the waveform of compensation policy as Figure 11, after visible t100 completes charging constantly, voltage can not maintain, and driving voltage falls to below expection voltage, can not meet the driving requirement of fuel injector.After driving strategy of the present invention, drive waveforms is as Figure 12, first t100 is the voltage precharge that energy reclaims, when reaching certain threshold value V1, enter the high-voltage power supply charging of t200 until effective value V3, from t200 ~ t300, added high pressure holding circuit, the effective value that has kept charging high pressure V3, high pressure is held time and is slightly less than fuel injection pulsewidth.Charging current, due to the inhibitory action of switch and the energy storage inductor 32 of PWM, presents the batch (-type) charging of multi-peak.The variation of corresponding voltage V3 is the switch change along with the PWM of charging current.And along with t100 ~ t300 finishes, charging signals cut-off, t400 is during this period of time in the fuel injection pulsewidth time, when to t500, high-voltage discharging signal is effective,, in discharge regime, first discharging to capacitor C 2 in energy recycling module in actuator loop, then guides to, because being all approaches short-circuit condition, so discharge waveform is all exponential form decline; But in effective discharge end of whole t500, effect due to Voltage Feedback module 5, the voltage of piezo actuator 91 drops to voltage and has closed over the ground discharge signal during V2, make piezo actuator 91 in a relatively high electromotive force effect, but now with respect to the voltage V3 that opens fuel injector, also have very large difference, so fuel injector can't further work.Thereby reach basis and the rapidly opened and closed control effect of fuel injector that energy reclaims.The driving pressure reduction that is actual needs is down to V3-V2 by original voltage V3.Voltage V2 adjusts flexibly by voltage feedback circuit 5, thereby can guarantee that actuator is at a best state of opening in advance, and described voltage V2 is corresponding with charge threshold voltage V_ref1.By oil pump energy recycling module 2, can reduce the energy requirement of DCDC high-voltage power supply V3-V1, V1 is synthetic by energy recovery section and electric discharge policy section, has reduced the power consumption of system, has improved system effectiveness.
The present invention carries out the current monitoring of charge and discharge process by 4 pairs of piezo actuators of current feedback module 91, by the voltage in the charging process of 5 pairs of piezo actuators 91 of Voltage Feedback module, monitor, high pressure when Voltage Feedback module 5 can be to the charging of piezo actuator 91, voltage during electric discharge regulates control, can also regulate charge threshold voltage by actuator dielectric loss feedback control circuit B, and by electric capacity gating compensating circuit A, the electric capacity of piezo actuator 91 is compensated, the impact of the dielectric loss of avoiding piezo actuator 91 on fuel injector work, by energy recovering circuit module C, the voltage of piezo actuator 91 and oil pump high voltage transient electromotive force are carried out to voltage recovery, and can carry out precharge to piezo actuator 91, compact conformation, Current Control precision is high, can reduce system power dissipation, under raising complex working condition, dielectric loss is to the stability of the work of fuel injector and reliability.
Claims (15)
1. drive a piezoelectric type fuel injector device, comprise piezo actuator a plurality of and that connect (91); It is characterized in that: described piezo actuator (91) is connected with actuator driven circuit module (3), described actuator driven circuit module (3) comprises switching tube M2, switching tube M3 and the switching tube M4 consistent with piezo actuator (91) quantity; The drain electrode of described switching tube M2 with for providing the output of the high pressure DCDC module (1) of the required driving voltage of piezo actuator (91) to be connected, the source terminal of switching tube M2 is connected with the drain electrode end of switching tube M3, the source terminal ground connection of switching tube M3, and the source terminal of switching tube M2 is connected with the first end of inductance L 2 with the drain electrode end of switching tube M3, the second end of inductance L 2 is connected with the high-pressure side of piezo actuator (91), and the low-pressure end of piezo actuator (91) connects with the drain electrode end of corresponding switching tube M4;
The high-voltage charging signal (61) of gate terminal receive logic treatment circuit (16) output of switching tube M2, the high-voltage discharging signal (62) of gate terminal receive logic treatment circuit (16) output of switching tube M3, gate terminal receive logic treatment circuit (16) output of switching tube M4 select cylinder control signal (63);
The input of logic processing circuit (16) is connected with the output of signal processor (15), and signal processor (15) is also connected with current feedback module (4) for detection of piezo actuator (91) operating current and connects for detection of the Voltage Feedback module (5) of the feedback sample voltage of piezo actuator (91), current feedback module (4) and Voltage Feedback module (5) are also connected with the input of logic processing circuit (16), current feedback module (4) regulates feedback signal (82) and current protection feedback signal (83) according to the operating current of piezo actuator (91) to signal processor (15) and logic processing circuit (16) transmission current peak value, Voltage Feedback module (5) is transmitted charging piezoelectricity pilot signal (84) and discharge voltage pilot signal (85) according to the feedback sample voltage of piezo actuator (91) to signal processor (15), and Voltage Feedback module (5) is to logic processing circuit (16) transmission discharge voltage pilot signal (85),
Signal processor (15) is according to the charging voltage of charging voltage pilot signal (84) judgement piezo actuator (91), when the voltage at piezo actuator (91) two ends reaches required operating voltage, logic processing circuit (16) turn-offs high-voltage charging signal (61) according to charging voltage pilot signal (84), and signal processor (15) makes by selecting the piezo actuator (91) of cylinder control signal (63) gating to enter discharge condition by the high-voltage discharging signal (62) of logic processing circuit (16) output; Signal processor (15) is according to the discharge voltage of discharge voltage pilot signal (85) judgement piezo actuator (91), when the voltage at piezo actuator (91) two ends reaches required discharge voltage, logic processing circuit (16) turn-offs high-voltage discharging signal (62) according to discharge voltage pilot signal (85), and signal processor (15) selects next corresponding piezo actuator (91) of cylinder control signal (63) gating by logic processing circuit (16).
2. driving piezoelectric type fuel injector device according to claim 1, it is characterized in that: described Voltage Feedback module (5) comprises comparator 92A, comparator 92B and actuator dielectric loss feedback control circuit (B), the in-phase end of described comparator 92A is connected with charge threshold voltage V_ref1, the end of oppisite phase of comparator 92A is connected with feedback sample voltage, comparator 92A exports charging voltage pilot signal (84), the end of oppisite phase of comparator 92B is connected with feedback sample voltage, the in-phase end of comparator 92B is connected with discharge threshold voltage V_ref2, comparator 92B exports discharge voltage pilot signal (85),
Actuator dielectric loss feedback control circuit (B) receives feedback sample voltage, when the voltage of determining piezo actuator (91) two ends according to described feedback sample voltage is during lower than required operating voltage, actuator dielectric loss feedback control circuit (B) can be to the dielectric loss compensation triggering signal (86) of signal processor (15) transmission, signal processor (15) is exported charging voltage threshold value conditioning signal (87) according to dielectric loss compensation triggering signal (86) to actuator dielectric loss feedback control circuit (B), actuator dielectric loss feedback control circuit (B) improves charge threshold voltage V_ref1 according to charging voltage threshold value conditioning signal (87).
3. driving piezoelectric type fuel injector device according to claim 2, it is characterized in that: described signal processor (15) is also connected with electric capacity gating compensating circuit (A), described electric capacity gating compensating circuit (A) is attempted by the two ends of piezo actuator (91), and signal processor (15) compensates the capacitance of piezo actuator (91) according to the dielectric loss compensation triggering signal (86) of actuator dielectric loss feedback control circuit (B) output by electric capacity gating compensating circuit (A).
4. driving piezoelectric type fuel injector device according to claim 1, it is characterized in that: the high-pressure side of described piezo actuator (91) is also connected with energy recovering circuit module (C), described energy recovering circuit module (C) is connected with oil pump energy recycling module (2) and signal processor (15), signal processor (15) is connected with the control input end of oil pump energy recycling module (2), energy recovering circuit module (C) also receives selects cylinder control signal (63), energy recovering circuit module (C) is charged to piezo actuator (91), the energy of energy recovery during electric discharge and the oil pump transient state high potential of oil pump energy recycling module (2) reclaims, energy recovering circuit module (C) can be carried out precharge to the piezo actuator of next gating (91).
5. driving piezoelectric type fuel injector device according to claim 1; it is characterized in that: described signal processor (15) is also connected with the output of system short-circuit protective circuit (6); system short-circuit protective circuit (6) is connected with high pressure DCDC module (1); system short-circuit protective circuit (6), can be to signal processor (15) and logic processing circuit (16) transmission system current protection triggering signal (81) according to the system power value that detects high pressure DCDC module (1).
6. driving piezoelectric type fuel injector device according to claim 1, it is characterized in that: the source terminal of described switching tube M2 is connected with the anode tap of diode D4, the drain electrode end of the cathode terminal of diode D4 and switching tube M3, the anode tap of diode D2, the first end of the cathode terminal of diode D3 and inductance L 2 connects, the anode tap ground connection of diode D3, the second end of inductance L 2 and the anode tap of diode D6, the high-pressure side of the cathode terminal of diode D7 and piezo actuator (91) connects, the anode tap ground connection of diode D7, the cathode terminal of diode D6 is connected with the cathode terminal of diode D2, the cathode terminal of the cathode terminal of diode D2 and diode D6 is connected with high pressure DCDC module (1).
7. driving piezoelectric type fuel injector device according to claim 1, it is characterized in that: the source terminal of described switching tube M4 is by resistance R 2 ground connection, current feedback module (4) is by being connected with the source terminal of switching tube M4, and by the sampling of 2 pairs of piezo actuators of resistance R (91) operating current; The high-pressure side of piezo actuator (91) is connected with one end of resistance R 4, the other end of resistance R 4 is connected with the first end of resistance R 5, the second end ground connection of resistance R 5, the first end of resistance R 5 is connected with Voltage Feedback module (5), and Voltage Feedback module (5) obtains feedback sample voltage by resistance R 5.
8. driving piezoelectric type fuel injector device according to claim 1, it is characterized in that: described high pressure DCDC module (1) comprises switching tube M1, the source terminal ground connection of switching tube M1, the drain electrode end of switching tube M1 is connected with one end of inductance L 1 and the anode tap of diode D1, the gate terminal of switching tube M1 is connected with the output of DCDC circuit (7), the other end of inductance L 1 is connected with voltage VBAT, the cathode terminal of diode D1 is connected with the drain electrode end of switching tube M2 and one end of capacitor C 1, and the other end of capacitor C 1 is by resistance R 1 ground connection.
9. driving piezoelectric type fuel injector device according to claim 1, it is characterized in that: described current feedback module (4) comprises the second amplifying circuit (11), the output of described the second amplifying circuit (11) is connected with the second comparison circuit (12), the 3rd comparison circuit (13), and the 3rd comparison circuit (13) is connected with the second trigger holding circuit (14); The output of the second comparison circuit (12) regulates feedback signal (82) to signal processor (15) and logic processing circuit (16) transmission current peak value, and trigger holding circuit (14) is to signal processor (15) and logic processing circuit (16) transmission current protection feedback signal (83).
10. driving piezoelectric type fuel injector device according to claim 2, it is characterized in that: described actuator dielectric loss feedback control circuit (B) comprises operational amplifier 94B and triode Q1, the anode tap of the in-phase end of described operational amplifier 94B and diode D16, one end of the cathode terminal of diode D17 and resistance R 6 connects, the other end of resistance R 6 is connected with feedback sampling circuit, the cathode terminal of diode D16 is connected with voltage V_ref, the anode tap ground connection of diode D17, the end of oppisite phase of operational amplifier 94B is connected with the output of operational amplifier 94B, the output output medium loss balancing triggering signal (86) of operational amplifier 94B, the base terminal of triode Q1 is connected with the charging voltage threshold value conditioning signal (87) of signal processor (15) output, the base terminal of triode Q1 is also connected with one end of resistance R 7 and one end of resistance R 9, the emitter terminal of triode Q1 is by resistance R 10 ground connection, the collector terminal of triode Q1 is connected with voltage V_ref by resistance R 8, the other end of resistance R 7 is connected with voltage V_ref, the other end of resistance R 9 is by resistance R 10 ground connection, the collector terminal of triode Q1 is connected with the in-phase end of comparator 92B.
11. driving piezoelectric type fuel injector devices according to claim 3, it is characterized in that: described electric capacity gating compensating circuit (A) comprises triode Q2, the collector terminal of triode Q2 is connected with the output of signal processor (15) by the first boostrap circuit (17), the emitter terminal of triode Q2 is respectively by resistance R 13, capacitor C 3 ground connection, the earth terminal ground connection of the first boostrap circuit (17), the collector terminal of triode Q2 is connected with one end of resistance R 12 and the anode tap of diode D18, the cathode terminal of diode D18 is connected with the other end of resistance R 12, and the cathode terminal of diode D18 is connected with the high-pressure side of piezo actuator (91).
12. driving piezoelectric type fuel injector devices according to claim 4, it is characterized in that: described oil pump energy recycling module (2) comprises switching tube M5 and switching tube M6, the source terminal ground connection of described switching tube M5, the drain electrode end of switching tube M5 is connected with the anode tap of diode D5 and one end of inductance L 3, the other end of inductance L 3 is connected with voltage VBAT, the cathode terminal of diode D5 is connected with energy recovering circuit module (C), and the gate terminal of switching tube M5 is used for receiving the first oil pump energy recovery control signal (64) of signal processor (15) output; The gate terminal of switching tube M6 is used for receiving the second oil pump energy recovery control signal (65) of signal processor (15) output, the source terminal ground connection of switching tube M6, the drain electrode end of switching tube M6 is connected with the cathode terminal of diode D8, and the anode tap of diode D8 is connected with the high-pressure side of piezo actuator (91) by resistance R 11.
13. driving piezoelectric type fuel injector devices according to claim 4, it is characterized in that: described energy recovering circuit module (C) comprises logical AND device 95B, the input of described logical AND device 95B receives the pre-arcing signal (89) that selects cylinder control signal (63) and signal processor (15) output, the output of logical AND device 95B is connected with the input of the second boostrap circuit (18), the output of the second boostrap circuit (18) is connected with the gate terminal of switching tube M7, the source terminal of switching tube M7 is connected with the anode tap of diode D9 anode tap and diode D10, the drain electrode end of switching tube M7 is connected with the cathode terminal of diode D11, the anode tap of diode D11 is connected with the high-pressure side of piezo actuator (91), the anode tap of diode D9, the equal ground connection of earth terminal of the anode tap of diode D10 and the second boostrap circuit (18), the cathode terminal of the cathode terminal of diode D9, diode D10 is connected with the cathode terminal of diode D12 and one end of inductance L 4, the anode tap of diode D12 is connected with oil pump energy recycling module (2), the other end of inductance L 4 is connected with one end of capacitor C 2 and the anode tap of diode D13, the other end ground connection of capacitor C 2, the cathode terminal of diode D13 is connected with the drain electrode end of switching tube M8, the source terminal of switching tube M8 is connected with the anode tap of diode D14 and the anode tap of diode D15, the gate terminal of switching tube M8 is connected with the output of the 3rd boostrap circuit (19), the input of the 3rd boostrap circuit (19) is connected with the precharging signal (88) of signal processor (15) output, the cathode terminal of diode D14 is connected with the cathode terminal of diode D15, the equal ground connection of earth terminal of the anode tap of the anode tap of diode D14, diode D15 and the 3rd boostrap circuit (19).
14. driving piezoelectric type fuel injector devices according to claim 5; it is characterized in that: described system short-circuit protective circuit (6) comprises the first amplifying circuit (8); the input of described the first amplifying circuit (8) is connected with high pressure DCDC module (1); the first amplifying circuit (8) is connected with the first trigger holding circuit (10) by the first comparison circuit (9), and the first trigger holding circuit (10) is to signal processor (15) and logic processing circuit (16) transmission system current protection triggering signal (81).
15. driving piezoelectric type fuel injector devices according to claim 5, is characterized in that: described logic processing circuit (16) comprises logical AND circuit U 1A, logical AND circuit U 1B, logical AND circuit U 1C, logical AND circuit U 3C, logical AND circuit U 4A, logical AND circuit U 2B and 138 decoders (20);
The input of logical AND circuit U 1A receives the charging control signal (70) of signal processor (15) transmission and the charging voltage pilot signal (84) of Voltage Feedback module (5) transmission, input received current protection feedback signal (83) and the current peak of logical AND circuit U 1C regulate feedback signal (82), the input of logical AND circuit U 1B is connected with the output of logical AND circuit U 1A and the output of logical AND circuit U 1C, the output output high-voltage charging signal (61) of logical AND circuit U 1B;
The input of logical AND circuit U 3C receives discharge voltage pilot signal (85) and discharge control signal (68), the input receiving system current protection triggering signal (81) of logical AND circuit U 4A, current peak regulate feedback signal (82) and current protection feedback signal (83), the input of logical AND circuit U 2B is connected with the input of logical AND circuit U 3C and logical AND circuit U 4A, the output output high-voltage discharging signal (62) of logical AND circuit U 2B;
The fuel injector that the input of 138 decoders (20) receives signal processor (15) transmission drives signal (69), and drives signal (69) output to select cylinder control signal (63) according to fuel injector.
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|---|---|---|---|
| CN201410271506.6A CN104037880B (en) | 2014-06-17 | 2014-06-17 | Drive piezoelectric type fuel injector device |
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| CN201410271506.6A CN104037880B (en) | 2014-06-17 | 2014-06-17 | Drive piezoelectric type fuel injector device |
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| CN104037880B CN104037880B (en) | 2016-05-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105386912A (en) * | 2015-10-12 | 2016-03-09 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Piezoelectric oil injector driving device capable of being adjusted online |
| CN105927437A (en) * | 2016-05-23 | 2016-09-07 | 中国第汽车股份有限公司无锡油泵油嘴研究所 | Piezoelectric type oil injector driving structure with energy recycling function |
| CN112394672A (en) * | 2020-11-30 | 2021-02-23 | 中船动力研究院有限公司 | Single-set interface multifunctional electromagnetic valve driving circuit |
| CN114738152A (en) * | 2022-04-24 | 2022-07-12 | 一汽解放汽车有限公司 | Fuel injection system and control method thereof |
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| CN101806875A (en) * | 2009-02-13 | 2010-08-18 | 无锡油泵油嘴研究所 | Diagnosis detecting method of piezoelectric executor and device thereof |
| CN202165166U (en) * | 2010-12-07 | 2012-03-14 | 中国第一汽车集团公司无锡油泵油嘴研究所 | Driving circuit of electromagnetic valve of oil spraying system of diesel engine |
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| CN101806875A (en) * | 2009-02-13 | 2010-08-18 | 无锡油泵油嘴研究所 | Diagnosis detecting method of piezoelectric executor and device thereof |
| CN202165166U (en) * | 2010-12-07 | 2012-03-14 | 中国第一汽车集团公司无锡油泵油嘴研究所 | Driving circuit of electromagnetic valve of oil spraying system of diesel engine |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386912A (en) * | 2015-10-12 | 2016-03-09 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Piezoelectric oil injector driving device capable of being adjusted online |
| CN105386912B (en) * | 2015-10-12 | 2017-11-03 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | The piezo injector drive device of energy on-line control |
| CN105927437A (en) * | 2016-05-23 | 2016-09-07 | 中国第汽车股份有限公司无锡油泵油嘴研究所 | Piezoelectric type oil injector driving structure with energy recycling function |
| CN105927437B (en) * | 2016-05-23 | 2018-09-21 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | The driving structure of piezo injector with energy regenerating |
| CN112394672A (en) * | 2020-11-30 | 2021-02-23 | 中船动力研究院有限公司 | Single-set interface multifunctional electromagnetic valve driving circuit |
| CN112394672B (en) * | 2020-11-30 | 2022-01-28 | 中船动力研究院有限公司 | Single-set interface multifunctional electromagnetic valve driving circuit |
| CN114738152A (en) * | 2022-04-24 | 2022-07-12 | 一汽解放汽车有限公司 | Fuel injection system and control method thereof |
| 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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| CN104037880B (en) | 2016-05-25 |
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