CN112746920B - Piezoelectric crystal fuel injector driving circuit - Google Patents
Piezoelectric crystal fuel injector driving circuit Download PDFInfo
- Publication number
- CN112746920B CN112746920B CN201911037135.4A CN201911037135A CN112746920B CN 112746920 B CN112746920 B CN 112746920B CN 201911037135 A CN201911037135 A CN 201911037135A CN 112746920 B CN112746920 B CN 112746920B
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- Prior art keywords
- piezoelectric crystal
- driving
- pole
- mos tube
- driving chip
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- 239000013078 crystal Substances 0.000 title claims abstract description 61
- 239000000446 fuel Substances 0.000 title claims abstract description 16
- 238000005070 sampling Methods 0.000 claims description 17
- 230000008859 change Effects 0.000 abstract description 8
- 239000003990 capacitor Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 238000004146 energy storage Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010710 diesel engine oil Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides a piezoelectric crystal fuel injector driving circuit, which is characterized in that on the basis of MC33816, IRS2101 is used for improving the highest driving voltage capability of MC33816, and simultaneously the functions of hardware current closed loop/fault protection and the like of MC33816 are utilized to realize the driving of the piezoelectric crystal fuel injector; an inductor L is connected in series in the piezoelectric crystal charge-discharge loop, energy can be transferred to a capacitor through the inductor in the charge-discharge process due to the energy storage effect of the inductor, the current change rate is reduced, when the current change rate is reduced, the current control precision is correspondingly improved, the MOS control frequency is reduced, and the circuit reliability is improved.
Description
Technical Field
The invention mainly relates to the field of piezoelectric crystal fuel injector driving circuits, in particular to a piezoelectric crystal fuel injector driving circuit.
Background
With the increasing stricter emission regulations, the continuous increase of injection pressure has become an indispensable means for controlling the injection of diesel engines, and currently, the injection peak pressure required for the diesel engine oil supply system has increased from 500Pa to 1600Pa, and the common rail system has reached 2000Pa.
Common rail systems are electromagnetic and piezoelectric, and the piezoelectric common rail system has a short response time, high driving pressure and accurate control of fuel injection quantity, is superior to the electromagnetic common rail system, and has a good development prospect in recent years.
The piezoelectric crystal is equivalent to a capacitor with a fixed capacitance value, the charge and discharge speed of the capacitor is very high, instantaneous large current is easy to generate, the current main scheme uses a pre-driving chip to realize the driving of the piezoelectric crystal fuel injector, the charging current precision of the piezoelectric crystal is not high, the current change rate is high, the MOS driving frequency is too high, overcurrent is easy to generate, and the MOS is easy to damage when a driving circuit works for a long time; the drive circuit has imperfect functions, needs singlechip software to complete current closed loop, and has long response time and high singlechip load; the driving capability of the driving circuit is low, and the driving of the high-voltage circuit cannot be realized.
Disclosure of Invention
The invention provides a piezoelectric crystal fuel injector driving circuit, which realizes the driving control of a piezoelectric crystal fuel injector and comprises the following components: a piezoelectric crystal charging circuit, the piezoelectric crystal charging circuit comprising: the output port of the pre-driving chip is connected with the G pole of the MOS tube Q2, the output port of the pre-driving chip is connected with the pre-driving chip to realize the voltage boosting, the output port of the pre-driving chip is connected with the G pole of the MOS tube Q1, the S pole signal of the MOS tube Q1 is connected with the piezoelectric crystal equivalent load C, the other end of the piezoelectric crystal equivalent load C is connected with the D pole of the MOS tube Q2, the S pole of the MOS tube Q2 is connected with the sampling resistor R1, the other end of the sampling resistor R1 is grounded, and the two ends of the sampling resistor R1 are connected with the input port of the pre-driving chip through wires.
Preferably, the MOS transistor Q1 is a high-side driving MOS transistor, and is connected to the output end of the boosting pre-driving chip, and the S electrode of the MOS transistor Q1 is connected with the piezoelectric crystal equivalent load C after passing through the inductor L.
Preferably, the MOS transistor Q2 is a low-side driving MOS transistor, and is connected to the output end of the pre-driving chip.
Preferably, the boosting pre-driving chip adopts IRS2101, and the pre-driving chip adopts MC33816.
Preferably, the piezoelectric crystal discharging circuit is further included, and the piezoelectric crystal discharging circuit includes: the output port of the pre-driving chip is connected with the G pole of the MOS tube Q3 and the G pole of the MOS tube Q2, the S pole of the MOS tube Q3 is connected with the sampling resistor R2, and two ends of the sampling resistor R2 are connected with the input port of the pre-driving chip through wires; the signal of the D electrode of the MOS tube Q3 is connected to the equivalent load C of the piezoelectric crystal, the other end of the equivalent load C of the piezoelectric crystal is connected with the D electrode of the MOS tube Q2, and the S electrode of the MOS tube Q2 is grounded.
Preferably, the MOS transistor Q3 is a low-side driving MOS transistor, and is connected to the output end of the pre-driving chip, and the S electrode of the MOS transistor Q3 is connected to the piezoelectric crystal equivalent load C after passing through the inductor L.
Preferably, the MOS transistor Q2 is a low-side driving MOS transistor, and the G electrode is connected to the output end of the pre-driving chip.
The utility model provides a piezocrystal drive circuit, drive circuit uses NXP chip MC33816 as the basis, improves the circuit, makes its realization piezocrystal sprayer drive control, and NXP chip MC33816 is a predrive chip, mainly used diesel nozzle drive, and the chip possesses the current hardware closed loop, and the current control precision is high, possesses fault protection diagnostic function simultaneously, but this chip maximum driving voltage can only reach 72V, and piezocrystal normal driving voltage is 200V, can't realize piezocrystal sprayer's drive control.
The IRS2101 belongs to a pre-driving chip, the highest driving voltage can reach 600V and is used for high-side NMOS driving, and the scheme provides that on the basis of MC33816, the IRS2101 is used for improving the highest driving voltage capability of MC33816, and meanwhile, the functions of hardware current closed loop/fault protection and the like of MC33816 are utilized, so that the driving of a piezoelectric crystal fuel injector is realized.
The scheme is characterized in that an inductor L is connected in series in the piezoelectric crystal charge-discharge loop, energy can be transferred to a capacitor through the inductor in the charge-discharge process due to the energy storage effect of the inductor, the current change rate is reduced, when the current change rate is reduced, the current control precision is correspondingly improved, the MOS control frequency is reduced, and the circuit reliability is improved.
The invention has the beneficial effects that: the circuit has extremely high voltage driving capability, can realize the control of the 600V piezoelectric crystal fuel injection driving circuit at most, adopts a current closed loop, and the current closed loop control is realized by hardware without the control of a singlechip, and has the advantages of high response speed, high current precision and small load of the singlechip; the current change rate is reduced, the current overshoot problem is solved, the MOS driving frequency is reduced, the service life of the MOS is prolonged, and the circuit reliability is high.
Drawings
FIG. 1 is a schematic circuit diagram of a piezoelectric crystal charging circuit;
fig. 2 is a schematic circuit diagram of a piezoelectric crystal discharge circuit.
Detailed Description
As shown in fig. 1, the method comprises: a piezoelectric crystal charging circuit, the piezoelectric crystal charging circuit comprising: the output port of the pre-driving chip is connected with the G pole of the MOS tube Q2, the output port of the pre-driving chip is connected with the pre-driving chip to realize the voltage boosting, the output port of the pre-driving chip is connected with the G pole of the MOS tube Q1, the S pole signal of the MOS tube Q1 is connected with the piezoelectric crystal equivalent load C, the other end of the piezoelectric crystal equivalent load C is connected with the D pole of the MOS tube Q2, the S pole of the MOS tube Q2 is connected with the sampling resistor R1, the other end of the sampling resistor R1 is grounded, and the two ends of the sampling resistor R1 are connected with the input port of the pre-driving chip through wires.
Preferably, the MOS transistor Q1 is a high-side driving MOS transistor and is used for modulating current waveforms, accessing the output end of the boosting pre-driving chip, and the S electrode of the MOS transistor Q1 is connected with the piezoelectric crystal equivalent load C after passing through the inductor L.
Preferably, the MOS transistor Q2 is a low-side driving MOS transistor, and is connected to the output end of the pre-driving chip.
Preferably, the boosting pre-driving chip adopts IRS2101, and the pre-driving chip adopts MC33816.
When the charging circuit works, the singlechip sets current limit, drives the pre-driving chip MC33816, when the piezoelectric crystal is charged, the voltage of the load capacitor can reach 200V, the control signal of the MC33816 needs to be boosted through the IRS2101, and the IRS2101 controls the MOS tube Q1 to be started so as to charge the equivalent load of the piezoelectric crystal.
MC33816 collects feedback voltage on the sampling resistor R1, when the voltage is higher than a set value, the MOS tube Q1 is turned off, and the current is reduced; when the voltage is continuously reduced and is lower than the set value, the MOS tube Q1 is conducted, and the current is increased. Thus, the piezoelectric crystal charge control is realized, and the MMOS tube Q2 is always kept on in the charging process.
In the charge and discharge process of the piezoelectric crystal fuel injector, the piezoelectric crystal is equivalent to a capacitive load C, the loop impedance is very small during charge and discharge, the current changes rapidly, the piezoelectric crystal fuel injector is equivalent to an inductor L in series before the capacitor C, the inductor has energy storage function during charge and discharge, and energy can be transferred to the capacitor through the inductor during charge and discharge, so that the current change rate is reduced.
Preferably, the piezoelectric crystal discharging circuit is further included, and the piezoelectric crystal discharging circuit includes: the output port of the pre-driving chip is connected with the G pole of the MOS tube Q3 and the G pole of the MOS tube Q2, the S pole of the MOS tube Q3 is connected with the sampling resistor R2, and two ends of the sampling resistor R2 are connected with the input port of the pre-driving chip through wires; the signal of the D electrode of the MOS tube Q3 is connected to the equivalent load C of the piezoelectric crystal, the other end of the equivalent load C of the piezoelectric crystal is connected with the D electrode of the MOS tube Q2, and the S electrode of the MOS tube Q2 is grounded.
Preferably, the MOS transistor Q3 is a low-side driving MOS transistor and is used for modulating current waveform, and is connected to the output end of the pre-driving chip, and the S electrode of the MOS transistor Q3 is connected to the piezoelectric crystal equivalent load C after passing through the inductor L.
Preferably, the MOS transistor Q2 is a low-side driving MOS transistor, and the G electrode is connected to the output end of the pre-driving chip.
When the discharge circuit works, the singlechip sets current limit, drives the pre-driving chips MC33816 and MC33816 to control the low-side MOS Q1/Q2, and the discharge circuit MOS does not need high-voltage driving, so that the IRS2101 is not required to amplify signals.
MC33816 collects feedback voltage on the sampling resistor R2, when the voltage is higher than a set value, the MOS tube Q3 is turned off, and the current is reduced; when the voltage is continuously reduced and is lower than the set value, the MOS tube Q3 is conducted, the current is increased, and the voltage is reciprocated in this way, so that the charge control of the piezoelectric crystal is realized, and the MOS tube Q2 is kept conducted all the time in the charging process.
The circuit has extremely high voltage driving capability, can realize the control of the 600V piezoelectric crystal fuel injection driving circuit at most, adopts a current closed loop, and the current closed loop control is realized by hardware without the control of a singlechip, and has the advantages of high response speed, high current precision and small load of the singlechip.
The current change rate is reduced, the current overshoot problem is solved, the MOS driving frequency is reduced, the service life of the MOS is prolonged, and the circuit reliability is high.
The above-described embodiments are merely illustrative of the principles of the present application and their effectiveness, and are not intended to limit the present application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications and variations which may be accomplished by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the claims of this patent application.
Claims (6)
1. A piezoelectric crystal fuel injector driving circuit is characterized in that: comprising the following steps: a piezoelectric crystal charging circuit, the piezoelectric crystal charging circuit comprising: the output port of the pre-driving chip is connected with the G pole of the MOS tube Q2, the output port of the pre-driving chip is connected with the pre-driving chip to realize the voltage boosting, the output port of the pre-driving chip is connected with the G pole of the MOS tube Q1, the S pole signal of the MOS tube Q1 is connected with the piezoelectric crystal equivalent load C, the other end of the piezoelectric crystal equivalent load C is connected with the D pole of the MOS tube Q2, the S pole of the MOS tube Q2 is connected with the sampling resistor R1, the other end of the sampling resistor R1 is grounded, and the two ends of the sampling resistor R1 are connected with the input port of the pre-driving chip through wires;
also included is a piezoelectric crystal discharge circuit, the piezoelectric crystal discharge circuit comprising: the output port of the pre-driving chip is connected with the G pole of the MOS tube Q3 and the G pole of the MOS tube Q2, the S pole of the MOS tube Q3 is connected with the sampling resistor R2, and two ends of the sampling resistor R2 are connected with the input port of the pre-driving chip through wires; the signal of the D electrode of the MOS tube Q3 is connected to the equivalent load C of the piezoelectric crystal, the other end of the equivalent load C of the piezoelectric crystal is connected with the D electrode of the MOS tube Q2, and the S electrode of the MOS tube Q2 is grounded.
2. The driving circuit of the piezoelectric crystal injector according to claim 1, wherein the MOS transistor Q1 is a high-side driving MOS transistor, and is connected to an output end of the boost pre-driving chip, and an S pole of the MOS transistor Q1 is connected to the piezoelectric crystal equivalent load C after passing through the inductor L.
3. The piezoelectric crystal injector driving circuit according to claim 1, wherein the MOS transistor Q2 is a low-side driving MOS transistor, and is connected to an output terminal of the pre-driving chip.
4. A piezoelectric crystal injector driver circuit according to claim 2 or claim 3, wherein the boost pre-driver chip employs IRS2101 and the pre-driver chip employs MC33816.
5. The driving circuit of the piezoelectric crystal injector according to claim 1, wherein the MOS transistor Q3 is a low-side driving MOS transistor, and is connected to the output end of the pre-driving chip, and the S pole of the MOS transistor Q1 is connected to the piezoelectric crystal equivalent load C after passing through the inductor L.
6. The piezoelectric crystal injector driving circuit according to claim 1, wherein the MOS transistor Q2 is a low-side driving MOS transistor, and the G electrode is connected to the output end of the pre-driving chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911037135.4A CN112746920B (en) | 2019-10-29 | 2019-10-29 | Piezoelectric crystal fuel injector driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911037135.4A CN112746920B (en) | 2019-10-29 | 2019-10-29 | Piezoelectric crystal fuel injector driving circuit |
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| Publication Number | Publication Date |
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| CN112746920A CN112746920A (en) | 2021-05-04 |
| CN112746920B true CN112746920B (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911037135.4A Active CN112746920B (en) | 2019-10-29 | 2019-10-29 | Piezoelectric crystal fuel injector driving circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114552955B (en) * | 2022-01-07 | 2023-11-21 | 卓品智能科技无锡股份有限公司 | H-bridge driving charging circuit, discharging circuit, fault diagnosis method and system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5430601A (en) * | 1993-04-30 | 1995-07-04 | Chrysler Corporation | Electronic fuel injector driver circuit |
| CN103899427A (en) * | 2012-12-26 | 2014-07-02 | 中国航空工业集团公司第六三一研究所 | Driving circuit of high pressure common rail oil atomizer |
| CN104564461A (en) * | 2013-10-10 | 2015-04-29 | 常远 | Oil injector electromagnetic valve driving circuit controlled by current feedback |
| CN104747331A (en) * | 2015-03-11 | 2015-07-01 | 中国重汽集团济南动力有限公司 | Boost circuit of diesel engine electrical control oil injector |
| CN104747333A (en) * | 2015-03-11 | 2015-07-01 | 中国重汽集团济南动力有限公司 | Integrated drive circuit for high pressure common rail injectors |
| CN104747332A (en) * | 2015-03-11 | 2015-07-01 | 中国重汽集团济南动力有限公司 | Driving circuit of diesel engine electrical control common rail oil injector |
| 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 |
| CN105545513A (en) * | 2016-02-05 | 2016-05-04 | 天津大学 | Embedded common rail diesel engine electronic control system based on MPC5554 and method |
| CN210799203U (en) * | 2019-10-29 | 2020-06-19 | 卓品智能科技无锡有限公司 | Piezoelectric crystal oil sprayer driving circuit |
-
2019
- 2019-10-29 CN CN201911037135.4A patent/CN112746920B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5430601A (en) * | 1993-04-30 | 1995-07-04 | Chrysler Corporation | Electronic fuel injector driver circuit |
| CN103899427A (en) * | 2012-12-26 | 2014-07-02 | 中国航空工业集团公司第六三一研究所 | Driving circuit of high pressure common rail oil atomizer |
| CN104564461A (en) * | 2013-10-10 | 2015-04-29 | 常远 | Oil injector electromagnetic valve driving circuit controlled by current feedback |
| CN104747331A (en) * | 2015-03-11 | 2015-07-01 | 中国重汽集团济南动力有限公司 | Boost circuit of diesel engine electrical control oil injector |
| CN104747333A (en) * | 2015-03-11 | 2015-07-01 | 中国重汽集团济南动力有限公司 | Integrated drive circuit for high pressure common rail injectors |
| CN104747332A (en) * | 2015-03-11 | 2015-07-01 | 中国重汽集团济南动力有限公司 | Driving circuit of diesel engine electrical control common rail oil injector |
| 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 |
| CN105545513A (en) * | 2016-02-05 | 2016-05-04 | 天津大学 | Embedded common rail diesel engine electronic control system based on MPC5554 and method |
| CN210799203U (en) * | 2019-10-29 | 2020-06-19 | 卓品智能科技无锡有限公司 | Piezoelectric crystal oil sprayer driving circuit |
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| CN112746920A (en) | 2021-05-04 |
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