CN104564461B - A kind of Drive Circuit for Injector Solenoid Valve of Current Feedback Control - Google Patents
A kind of Drive Circuit for Injector Solenoid Valve of Current Feedback Control Download PDFInfo
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- CN104564461B CN104564461B CN201310469190.7A CN201310469190A CN104564461B CN 104564461 B CN104564461 B CN 104564461B CN 201310469190 A CN201310469190 A CN 201310469190A CN 104564461 B CN104564461 B CN 104564461B
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Abstract
The invention belongs to Design of High Pressure Common Rail Diesel Engine fuel Injection Control technical field, is related to a kind of Drive Circuit for Injector Solenoid Valve of Current Feedback Control, it is intended to improves the rapidity and reliability of driving fuel injector magnetic system.The circuit is made up of high-order high voltage switching circuit (1), high-order low-voltage switches circuit (2) and low level gating circuit switch (3), input port Port1 receives the pulse of control oil injection duration, and output port Port2 and Port3 are connected with magnetic valve.The circuit gathers electromagnetic valve current and compared with real-time reference voltage in real time, the high-low voltage using switch mosfet pipe Time-sharing control by magnetic valve, automatically generates " peak value maintenance " electric current of needs.During the circuit drives fuel injector, each magnetic valve only needs controller to send a control pulse, on the premise of fast driving magnetic valve is ensured, the occupancy to controller resource can have both been reduced, can have been prevented again during magnetic valve short circuit because switching tube turns on the damage to drive circuit for a long time.
Description
The invention belongs to Design of High Pressure Common Rail Diesel Engine fuel Injection Control technical field for technical field, and in particular to one finishes
The drive circuit of the fuel injector magnetic system of Current Feedback Control is realized full by hardware circuit.
In Design of High Pressure Common Rail Diesel Engine fuel injection control systems, fuel injector magnetic system performs background technology as crucial
Part, quick, reliable action are the premises for ensureing flexible, accurate oil spout, due to magnetic valve electromagnetic force and pass through line solenoid valve
The electric current of circle is directly related, when designing the drive circuit of magnetic valve, more to produce " peak value-maintenance " type driving current as design
Target, i.e., first allow magnetic valve to produce big electromagnetic force by larger peak point current so as to quickly open magnetic valve, work as magnetic valve
State is maintained open to reduce power consumption by less electric current to magnetic valve again after opening completely.In terms of specific implementation, mostly
Using SCM Based open-loop control technology, i.e. single-chip microcomputer directly sends PWM (pulse width modulation) signal control magnetic valve
Work.Drive circuit based on opened loop control, driving current voltage influence driven is larger, easily influences the accuracy of oil spout；Together
When, the difference of process materials causes magnetic valve electrical parameter to produce deviation, and distributive value can be caused inconsistent；It is in addition, multiple driving
Fuel injector needs to take more mcu resource when realizing multi-injection, influences the reliability of control unit.
The content of the invention present invention is in order to overcome the shortcomings of above technology, there is provided a kind of driving electricity of Current Feedback Control
Road, the real-time collection that electromagnetic valve current is completed by hardware circuit are fed back, and using high-low voltage timesharing actuation techniques, pass through MOSFET
Switching tube Time-sharing control is carried in the high-low voltage on magnetic valve, and the circuit is only needed from single-chip microcomputer input oil injection duration
Control pulse, you can automatically generate " peak value-maintenance " electric current of needs.
The technical solution adopted by the present invention：
A kind of driving circuit for electromagnetic valve of Current Feedback Control, by high-order high voltage switching circuit, high-order low-voltage switches
Circuit and low level gating circuit switch composition.In low level gating circuit switch, earth terminal one resistance of series connection of magnetic valve is made
For the sampling resistor (can share a sampling resistor when there is the magnetic valve of multichannel specification of the same race) of driving current, sampled voltage point
Inverting input not with the voltage comparator in high-order high voltage switching circuit, high-order low-voltage switches circuit is connected.It is high-order
High voltage comparator and the resistor network of surrounding form hysteresis comparator, and in-phase input end connects the ginseng for representing pre-set peak value electric current
Examine voltage (can be adjusted by potentiometer)；The resistor network of high-order low-voltage comparator and surrounding forms hysteresis comparator, same to phase
Input connection represents the default reference voltage (can be adjusted by potentiometer) for maintaining electric current.The output of two voltage comparators is led to
Cross high-low voltage of two switch mosfet pipe difference controlled loadings on magnetic valve.Original state magnetic valve sampled voltage is
Zero, high-order high voltage comparator and high-order low-voltage comparator export high level, but low level gating switch is closed, electricity
Magnet valve no power.After single-chip microcomputer sends Injection Control pulse, low level gating switch conducting, magnetic valve is initially powered up, driving electricity
Stream is first rapidly achieved peak value in the presence of high voltage hysteresis comparator, is then maintained under the effect of low-voltage hysteresis comparator
One relatively low level.After Injection Control end-of-pulsing, low level gating switch is closed, and electromagnetic valve current rapidly drops to
Zero.
Beneficial effects of the present invention：
1. being driven by high-low voltage timesharing, it can both ensure that magnetic valve is quickly opened, after magnetic valve opening can be reduced again
Energy expenditure, improve the reliability of drive circuit；
2. using Current Feedback Control, real-time collection and the feedback of control electric current are realized using hardware circuit completely, automatically
Control circuit works, and is excessively participated in without controller, reduces the occupancy to controller resource；
3. possess error protection effect, when magnetic valve short circuit, due to current feedback be not in switch tube current it is excessive and
The situation of damage, at the same drive circuit can also extend out diagnostic circuit it is convenient magnetic valve is opened, short trouble diagnosis.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the present invention；
Fig. 2 is the driving test chart carried out using the present invention to fuel injector.
Embodiment
The present invention relates to a kind of Drive Circuit for Injector Solenoid Valve of Current Feedback Control, by high-order high voltage switch circuit
(1), high-order low-voltage switches circuit (2) and low level gating circuit switch (3) composition, control the gating signal of oil injection duration from
Port Port1 is inputted, and two terminals of fuel injector magnetic system are connected with output port Port2 and Port3；
High-order high voltage switch circuit (1) control high voltage VH and magnetic valve break-make, it is voltage comparator U1 same phase, anti-phase
Input is connected with three pin potentiometer R1 adjustment end and resistance R13 one end respectively, and U1 output end passes through pull-up resistor R3
It is connected with power supply VCC1, U1 output end connects by feedback resistance R2 and R1 one end, R1 another termination GND, drives core
Piece U2 Vcc pins are connected with power supply VCC1 and electric capacity C1 one end, another termination GND of C1, U2 IN pins and U1 output end
Connection, U2 COM pins meet GND, and U2 VB pins are connected with the positive pole of diode D1 negative pole and electric capacity C2, and D1 positive pole connects
VCC1, U2 H0 pins are connected by resistance R4 with switch mosfet pipe Q1 grid, and Q1 source electrode is connected with high voltage VH, Q1
Drain electrode be connected with U2 Vs pins and protection diode D2 anode；
High-order low-voltage switches circuit (2) control low-voltage VL and magnetic valve break-make, it is voltage comparator U3 same phase, anti-
Phase input is connected with potentiometer R7 one end and resistance R13 one end respectively, the R7 other end and three pin potentiometer R6 tune
The connection of whole end, R6 other both ends respectively with power supply VCC1 and be connected, U3 output end passes through pull-up resistor R9 and power supply
VCC1 connections, U3 output end also connect by feedback resistance R8 and the R7 other end, driving chip U4 Vcc pins and power supply
VCC1 connects with electric capacity C3 one end, and C3 another termination GND, U4 IN pins and U3 output end connect, and U4 COM pins connect
GND, U4 VB pins are connected with the positive pole of diode D3 negative pole and electric capacity C4, and D3 positive pole meets VCC1, and U4 H0 pins lead to
The grid that resistance R10 is crossed with switch mosfet pipe Q2 is connected, and Q2 source electrode is connected with low-voltage VL, and Q2 drain electrode and U4 Vs draw
Pin connects with protection diode D4 anode；
Low level gating circuit switch (3) controls the time of fuel injection duration, photoelectric isolated chip U5 A pins and power supply VCC2
Connection, U5 K pins are connected by current-limiting resistance R11 with input port Port1, and U5 VCC pin is connected with power supply VCC1, U5
GND pin meet GND, U5 V0 pins by current-limiting resistance R12 and voltage-regulator diode D7 anode and switch mosfet pipe Q3
Grid connection, D7 negative electrode meets GND, and Q3 source electrode is connected with output port Port3, and sampling resistor R14 is passed through in Q3 drain electrode
GND is met, the R14 non-GND ends that connect are connected with resistance R13, the R13 other end and U1, U2 inverting input and low pass filter
Electric capacity C6 connections, C6 another termination GND, Port2 are connected with D4, D2 negative electrode and sustained diode 5, D6 negative electrode, D5's
Anode is connected with Port3, and D6 anode meets GND.
The specific work process of the present invention：
After power on circuitry, no current on original state magnetic valve, sampled voltage zero, high-order high voltage switching circuit (1)
Middle comparator U1 homophase input terminal voltage can be obtained by VCC1 and resistance R3, R2 and potentiometer R1 partial pressure, as default
The reference voltage Vref 1 of peak point current is represented, can change its size by adjusting R1；In high-order low-voltage switches circuit (2)
Comparator U3 homophase input terminal voltage can be obtained by VCC1 and resistance R5, R8, R9 and potentiometer R6, R7 partial pressure, be pre-
If representative maintain electric current reference voltage Vref 2, but can be by adjusting its size of R6.The in-phase end electricity of two voltage comparators
Pressure is all higher than anti-phase terminal voltage, and output is high level, but switching tube Q3 ends in low level gating circuit switch (3), magnetic valve
No power.
After single-chip microcomputer sends Injection Control pulse, in the presence of driving chip U5 and resistance R11, R12, switching tube Q3
Conducting, solenoid valves, driving current rapid increase.When driving current is more than Vref2, comparator U2 upsets export low electricity
Flat, in the presence of R7, R8 and R9, Vref2 is somewhat reduced, but still much larger than zero.When driving current is more than Vref1, compare
Device U1 upset output low levels, switching tube Q1 cut-offs, high voltage VH disconnect with magnetic valve, and electromagnetic valve current declines, while U1 is same
Phase input terminal voltage Vref1, which is reduced, (is slightly larger than zero, after electric current is less than Vref1 now, comparator U1 can just overturn change again
For high level).When driving current continues to reduce when less than Vref2, U3 upsets export high level, and pass through U4, R10
Switching tube Q2 is in the conduction state, and magnetic valve is driven by low-voltage VL, and driving current rises again, while Vref2 is in R7, R8
With somewhat rise in the presence of R9, Q2 a small ranges near Vref2 are constantly overturn, formed maintain electric current.High-order low-voltage is opened
The purpose that hysteresis comparator is used in powered-down road is easy for controlling Q2 toggle frequency, and rational dimension can be obtained by adjusting R7
Hold frequency.Diode D2, D4 effect are the impacts of electric current switch tube Q1, Q2 when protecting magnetic valve switching electricity；D5、D6
Effect be when magnetic valve powers off formation afterflow passage.
After Injection Control end-of-pulsing, switching tube Q3 cut-offs, magnetic valve power-off, driving current rapid decrease, work as driving
When electric current is less than Vref2, U3 upset output high level, when driving current is less than Vref1, U1 upset output high level, under
One time drive magnetic valve is prepared.
The present invention gathers driving current in real time by a resistance, feeds back to two hysteresis comparators, is opened using MOSFET
High-low voltage of the pipe Time-sharing control by magnetic valve is closed, automatically generates " peak value-maintenance " electric current of needs, each magnetic valve is only
A control pulse need to be inputted.Using the circuit on the premise of fast driving fuel injector magnetic system is ensured, it can both reduce to control
The occupancy of device resource processed, it can prevent again in magnetic valve short circuit because switching tube turns on the damage to drive circuit for a long time,
Improve the reliability of drive circuit.
Claims (1)
1. a kind of Drive Circuit for Injector Solenoid Valve based on Current Feedback Control, it is characterised in that the circuit is by high-order high
Compress switch circuit (1), high-order low-voltage switches circuit (2) and low level gating circuit switch (3) composition, controls oil injection duration
Gating signal is inputted from port Port1, and two terminals of fuel injector magnetic system are connected with output port Port2 and Port3；
High-order high voltage switch circuit (1) control high voltage VH and magnetic valve break-make, voltage comparator U1 same phase, anti-phase input
End is connected with three pin potentiometer R1 adjustment end and resistance R13 one end respectively, and U1 output end is by pull-up resistor R3 and electricity
Source VCC1 connections, U1 output end connect by feedback resistance R2 and R1 one end, R1 another termination GND, driving chip U2
Vcc pins be connected with power supply VCC1 and electric capacity C1 one end, C1 another termination GND, U2 IN pins and U1 output end connect,
U2 COM pins meet GND, and U2 VB pins are connected with the positive pole of diode D1 negative pole and electric capacity C2, and D1 positive pole meets VCC1,
U2 H0 pins are connected by resistance R4 with switch mosfet pipe Q1 grid, and Q1 source electrode is connected with high voltage VH, Q1 leakage
The anode connection of pole and U2 Vs pins and protection diode D2；
High-order low-voltage switches circuit (2) control low-voltage VL and magnetic valve break-make, it is voltage comparator U3 same phase, anti-phase defeated
Enter end to be connected with potentiometer R7 one end and resistance R13 one end respectively, the R7 other end and three pin potentiometer R6 adjustment end
Connection, R6 other both ends be connecteds with power supply VCC1 and ground respectively, and U3 output end passes through pull-up resistor R9 and power supply VCC1 companies
Connect, U3 output end also connects by feedback resistance R8 and the R7 other end, driving chip U4 Vcc pins and power supply VCC1 and
Electric capacity C3 one end connects, and C3 another termination GND, U4 IN pins and U3 output end connect, and U4 COM pins meet GND, U4's
VB pins are connected with diode D3 negative pole and electric capacity C4 positive pole, and D3 positive pole meets VCC1, and U4 H0 pins pass through resistance R10
It is connected with switch mosfet pipe Q2 grid, Q2 source electrode is connected with low-voltage VL, Q2 drain electrode and U4 Vs pins and protection
Diode D4 anode connection；
Low level gating circuit switch (3) controls the time of fuel injection duration, and photoelectric isolated chip U5 A pins and power supply VCC2 connect
Connect, U5 K pins are connected by current-limiting resistance R11 with input port Port1, and U5 VCC pin is connected with power supply VCC1, U5's
GND pin meets GND, U5 V0 pins by current-limiting resistance R12 and voltage-regulator diode D7 anode and switch mosfet pipe Q3
Grid connects, and D7 negative electrode meets GND, and Q3 source electrode is connected with output port Port3, and Q3 drain electrode connects by sampling resistor R14
GND, the R14 non-GND ends that connect are connected with resistance R13, the R13 other end and U1, U2 inverting input and low pass filter electricity
Hold C6 connections, C6 another termination GND, Port2 are connected with D4, D2 negative electrode and sustained diode 5, D6 negative electrode, D5 sun
Pole is connected with Port3, and D6 anode meets GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310469190.7A CN104564461B (en) | 2013-10-10 | 2013-10-10 | A kind of Drive Circuit for Injector Solenoid Valve of Current Feedback Control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310469190.7A CN104564461B (en) | 2013-10-10 | 2013-10-10 | A kind of Drive Circuit for Injector Solenoid Valve of Current Feedback Control |
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| Publication Number | Publication Date |
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| CN104564461A CN104564461A (en) | 2015-04-29 |
| CN104564461B true CN104564461B (en) | 2017-12-15 |
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| CN201310469190.7A Expired - Fee Related CN104564461B (en) | 2013-10-10 | 2013-10-10 | A kind of Drive Circuit for Injector Solenoid Valve of Current Feedback Control |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351128B (en) * | 2015-12-11 | 2017-10-27 | 中国北方发动机研究所(天津) | A kind of jet drive circuit of the high-speed electromagnetic valve with boost function |
| CN108131487B (en) * | 2017-12-20 | 2019-06-28 | 中国航发贵州红林航空动力控制科技有限公司 | A kind of electromagnetic valve switch control system of type multimode electromagnetic valve actuator |
| CN110005532B (en) * | 2019-03-18 | 2021-10-26 | 哈尔滨工程大学 | Driving circuit of diesel engine position control type actuator |
| CN112746920B (en) * | 2019-10-29 | 2024-01-23 | 卓品智能科技无锡有限公司 | Piezoelectric crystal fuel injector driving circuit |
| CN112312616A (en) * | 2020-09-29 | 2021-02-02 | 南京百纳自动化系统有限公司 | Novel air-jet loom solenoid valve drive control circuit of solar terms |
| CN114609900A (en) * | 2022-04-15 | 2022-06-10 | 中国兵器装备集团自动化研究所有限公司 | Electromagnetic valve driving method and driving system based on PID control |
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| US4338651A (en) * | 1980-10-01 | 1982-07-06 | The Bendix Corporation | Dual coil driver |
| CN101215995A (en) * | 2008-01-21 | 2008-07-09 | 清华大学 | Natural gas engine electromagnetic valve jet drive circuit |
| CN201148923Y (en) * | 2008-01-25 | 2008-11-12 | 清华大学 | Electromagnetic valve injection drive circuit of natural gas engine |
| CN101770844A (en) * | 2009-01-06 | 2010-07-07 | 安泰汽车电气系统（昆山）有限公司 | Electromagnetic coil driving circuit |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4338651A (en) * | 1980-10-01 | 1982-07-06 | The Bendix Corporation | Dual coil driver |
| CN101215995A (en) * | 2008-01-21 | 2008-07-09 | 清华大学 | Natural gas engine electromagnetic valve jet drive circuit |
| CN201148923Y (en) * | 2008-01-25 | 2008-11-12 | 清华大学 | Electromagnetic valve injection drive circuit of natural gas engine |
| CN101770844A (en) * | 2009-01-06 | 2010-07-07 | 安泰汽车电气系统（昆山）有限公司 | Electromagnetic coil driving circuit |
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| CN104564461A (en) | 2015-04-29 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Kun Inventor after: Ouyang Guangyao Inventor after: Liu Zhenming Inventor after: Chang Yuan Inventor before: Chang Yuan Inventor before: Ouyang Guangyao Inventor before: Liu Zhenming Inventor before: Kong Yanfeng |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20151026 Address after: 430033 Wuhan, Jiefang Road, Hubei, No. 72 mailbox Applicant after: Navy Engineering Univ. PLA Address before: 430033 Department of internal combustion power engineering, No. 717 Jiefang Road, Hubei, Wuhan Applicant before: Chang Yuan Applicant before: Ouyang Guangyao Applicant before: Liu Zhenming |
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