CN110005532A - A kind of driving circuit of diesel engine position control formula actuator - Google Patents
A kind of driving circuit of diesel engine position control formula actuator Download PDFInfo
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- CN110005532A CN110005532A CN201910204657.2A CN201910204657A CN110005532A CN 110005532 A CN110005532 A CN 110005532A CN 201910204657 A CN201910204657 A CN 201910204657A CN 110005532 A CN110005532 A CN 110005532A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
- F02D1/08—Transmission of control impulse to pump control, e.g. with power drive or power assistance
- F02D1/12—Transmission of control impulse to pump control, e.g. with power drive or power assistance non-mechanical, e.g. hydraulic
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
- F02D1/08—Transmission of control impulse to pump control, e.g. with power drive or power assistance
- F02D2001/082—Transmission of control impulse to pump control, e.g. with power drive or power assistance electric
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Amplifiers (AREA)
- Electronic Switches (AREA)
Abstract
The purpose of the present invention is to provide a kind of driving circuits of diesel engine position control formula actuator, including driving signal input circuit, overcurrent protection circuit, driving current feed circuit, pulse feedback circuitry and emergent stop signal input circuit.Advantages of the present invention are as follows: the 1) output of driving logic is realized using photoelectrical coupler, MOSFET as main logic inverting element, the selection of component type is easy, easy to accomplish；2) system can be adjusted pwm control signal, realize the automatic adjustment of system according to the driving current and driving pulse of feedback；3) there is excess current protective function; current foldback circuit can close actuator low side control switch Q8 when current is excessive; prevent that electric current is excessive and damages circuit 4) when driving circuit failure; pass through emergent stop signal input circuit; actuator is closed in time independently, there is safeguard protection effect.
Description
Technical field
The present invention relates to a kind of diesel engine electric control device, specifically diesel electric-controlled actuator.
Background technique
With the fast development of electronic device, Diesel Engine Control is mechanically changed into electronic type via traditional.At present
At home due to the limitation of technology, position control formula actuator is still most widely used compared with time-based control and joint-track type.For position
Formula actuator is by the pwm control signal of integrated circuit control system output different duty, by its external driving circuit
Pwm control signal is converted to current value of different sizes, comparative example electromagnet executing agency is driven, and ratio electromagnetism is passed through
Iron, which generates different electromagnetic forces, makes rack gear be in different location, and then controls the operation of diesel engine.
Currently, the actuator of diesel engine is divided into mechanical, fluid pressure type, pneumatic type and electromagnetic type from working principle.Machine
The sensitivity of tool formula actuator and control characteristic are poor；Structure is complicated for fluid pressure type actuator, the requirement of maintenance maintenance technical level
It is high；Pneumatic type actuator is to the more demanding of pressure responsive element.And electricmagnetic actuator has than mechanical high sensitivity
With precision, and structure is simple for fluid pressure type, and maintenance and repair is easy, therefore the application of electricmagnetic actuator still accounts for
It is most.When designing the driving circuit of diesel engine position control formula actuator, need to solve following problems: 1) driving pulse and drive
Dynamic to enable to be the key signal for controlling actuator work, to guarantee that actuator can accurately drive, switching device is needed while being received
After two kinds of signals, it could act；2) driving current of flowing through drive circuit is very big, needs to limit its electric current and is no more than rated value,
It prevents circuit because overcurrent and burns out；3) (diesel engine cannot effectively be controlled when the failure of the driving signal of driving circuit
System), it needs to control cutting driving current by external circuit, actuator is enable to stop working in time；4) driving circuit needs to drive
Moving pulse feedback and driving current feedback to adjust the duty ratio of pwm control signal in time, further adjust proportion electro-magnet
Driving current size in executing agency, and then the position of adjusting gear rack carry out speed regulating control to diesel engine.
Publish in " internal combustion engine journal " (2002Vol.20) " diesel engine rack position actuator and Electronic governing system
Research " devises a kind of position model actuator control system circuit hardware structure in a text, control system include CPU, light every
Power amplifier, two to the filtering and amplifying circuit of rack position signal processing and handle the shaping filter of diesel engine speed signal
Circuit, the core of hardware configuration are by two-way rack position feedback respectively on whole strokes of rack gear and on distributive value influence
The best part stroke is sampled, so that the displacement of adjusting gear rack, adjusts the throttle of diesel engine, achieve the purpose that speed regulation.It should
Control system hardware configuration without reference to circuit overcurrent protection, and when driving signal failure when circuit hardware how to realize
The emergency stop of actuator.
" the fault diagnosis system of diesel engine actuator driven circuit published in " Modern Vehicle power " (2012Vol.1)
A kind of design " hardware design of the driving circuit fault diagnosis system of Design of High Pressure Common Rail Diesel Engine actuator involved in a text, packet
Include current sampling circuit, signal processing circuit, threshold value setting circuit, comparator circuit, oscillator, latch cicuit, logical operation
Circuit and actuator driven circuit.Current signal is converted to voltage signal simultaneously by current sampling circuit by the hardware configuration
It is filtered amplification, compared with short-circuit threshold voltage, comparison result leads to by latch circuit latches, and with the driving signal of MCU
Logic circuit operation is crossed, the driving circuit of actuator is directly driven.The system hardware needs to compare by logical operation circuit
The voltage signal of device and the driving signal of MCU carry out closing driving signal to actuator driven circuit after carrying out logical operation, do not have
Have in view of (cannot effectively be controlled diesel engine) when driving signal fails, how to close driving circuit switch, make
Actuator stops working.
The patent document of publication number CN104500298A (publication date on April 8th, 2015) discloses a kind of piezoelectric ceramic spray
At the driving current control circuit of oily device, including first processor, inductance gating circuit, piezoelectric ceramic actuator, sampling threshold
Manage circuit, current sampling circuit, threshold value control circuit, current control circuit, second processor, latch, boostrap circuit and
D/A module.The technology receives the radio frequency capture enable signal and sampling threshold of first processor output by second processor simultaneously
After the threshold current control trigger signal of processing circuit output, to latch output services current control trigger signal, lock simultaneously
Also acceptance threshold current control trigger signal, latch export current controling signal and drive storage to logic according to both signals
The switch of dynamic circuit, logic drive circuit control charge switch pipe T1 and discharge switch pipe T2 is dynamic to control piezoelectric ceramic actuator
Make.It is related to the driving circuit of the piezoelectric ceramics with dual processor on driving circuit, without reference to the drive of position model actuator
Dynamic circuit.
The patent document of publication number CN204493047U (publication date on July 22nd, 2015) discloses a kind of diesel electric-controlled
The driving circuit of common-rail injector, including single-chip microcontroller, the time-base signal generation circuit that is connected to single-chip microcontroller ETPUA interface,
MOSFET driving circuit I, MOSFET driving circuit II, MOSFET driving circuit III, the amplification filter for being connected to single-chip microcontroller ADC module
Wave circuit, AND gate circuit, hysteresis comparison circuit, 24V driving power and 48V driving power.The patent in fuel injector by opening
Stage by 48V power supply power supply, reduces electromagnetism valve opening time, by 24V power supply is drive circuitry after unlatching, maintains electromagnetism
The smaller constant electric current of valve, to reach reduction energy consumption, the purpose of protection element.Double drive power supply is related on driving circuit
Driving circuit for electromagnetic valve, without reference to the driving circuit of the position model actuator of single drive power supply.
The patent document of publication number CN105065130B (publication date on July 6th, 2018) discloses a kind of diesel engine digital
Speed regulation device and control method relate to a kind of design of speed regulation driving main circuit, including photoelectric isolating driving circuit, driving electricity
Flow Acquisition Circuit, driving voltage Acquisition Circuit and peripheral drive circuit element.Although being equipped with fuse conduct in the technology
Overcurrent protection measure, but the blowout current of fuse is fixed value, and overcurrent protection when only for field power supply short circuit can not
The driving current caused by other situations is excessive to make a response, and when blowout, needs to carry out device dismantling replacement and protects
Dangerous silk.And the technology does not account for how closing driving circuit switch when driving signal fails, actuator being made to stop working.
Summary of the invention
The purpose of the present invention is to provide a kind of driving circuits of diesel engine position control formula actuator.
The object of the present invention is achieved like this:
A kind of driving circuit of diesel engine position control formula actuator of the present invention, it is characterized in that: including that driving signal inputs
Circuit, overcurrent protection circuit, driving current feed circuit, pulse feedback circuitry and emergent stop signal input circuit；
The driving signal input circuit includes driving pulsewidth input branch, the enabled input branch of driving and driving signal
Input switching circuit；
The driving pulsewidth inputs branch, including optical coupling isolation circuit I and switch mosfet logic circuit I；Described
Optical coupling isolation circuit I includes photoelectrical coupler U7, and the pin 1 of U7 connects the one end for drawing R16, and the pin 2 of photoelectrical coupler U7 connects
The tie point of the driving pulsewidth output end of pull-up resistor R57 and integrated circuit control system, the pin 3 of photoelectrical coupler U7 connect electricity
One end of R21 is hindered, the pin 4 of photoelectrical coupler U7 connects 24V power supply, and pull-up resistor R57 and pull-up resistor R16 are all connected with power supply
VCC；The switch mosfet logic circuit I includes metal-oxide-semiconductor Q5, the grid connecting resistance R21 other end of metal-oxide-semiconductor Q5 and R24's
One end, another termination PGND of R24, the source electrode of metal-oxide-semiconductor Q5 meet PGND, and the drain electrode of metal-oxide-semiconductor Q5 connects pull-up resistor R22, pull down resistor
The tie point of R25 and resistance R30, the forward end of another terminating diode D7 of resistance R30 and the grid of metal-oxide-semiconductor Q8, pull-up electricity
Resistance R22 connects 24V power supply, and pull down resistor R25 meets PGND；
The enabled input branch of the driving, including optical coupling isolation circuit II and switch mosfet logic circuit II；It is described
Optical coupling isolation circuit II include photoelectrical coupler U6, one end of the 1 connecting resistance R15 of pin of photoelectrical coupler U6, resistance R15's
The tie point of another termination pull down resistor R58 and integrated circuit control system driving enable signal output end, photoelectrical coupler U6
Pin 2, pin 3 meet PGND, one end of pin 4 connecting resistance R20, R23, another termination 24V power supply of resistance R20, resistance R23
Another termination PGND, pull down resistor R58 meets GND；The switch mosfet logic circuit II includes metal-oxide-semiconductor Q4, metal-oxide-semiconductor Q4
Grid connecting resistance R23 and photoelectrical coupler U6 the tie point that connects of pin 4, the source electrode of metal-oxide-semiconductor Q4 meets PGND, metal-oxide-semiconductor Q4
Drain electrode connect the drain electrode of metal-oxide-semiconductor Q5；
The driving signal input switching circuit, including metal-oxide-semiconductor Q8, the grid of metal-oxide-semiconductor Q8 connect diode D7 and resistance
The tie point of R30, the source electrode of metal-oxide-semiconductor Q8 meet PGND, and the drain electrode of metal-oxide-semiconductor Q8 connects the pin 1 of freewheeling diode D6, freewheeling diode
The pin 2 of D6 connects the input terminal and 24V power supply of actuator.
The present invention may also include:
1, the overcurrent protection circuit, including given reference voltage input circuit, voltage compare output circuit and
Switch mosfet logic circuit III；
The given reference voltage input circuit, including voltage regulator circuit, pressure filter circuit；The voltage regulator circuit,
One end of resistance R31 is connected with 24V power supply, and the one of the resistance R31 other end and the pin 1 of reference voltage device D3 in parallel, resistance R39
End connection, the pin 2 of reference voltage device D3 in parallel meet PGND, and the pin 3 of reference voltage device D2 in parallel is hanging；The partial pressure filter
The other end of wave circuit, resistance R39 is connected with capacitor C11, the one end resistance R45, another termination PGND of capacitor C11, resistance R45's
The other end is connected with one end of variable resistance VR3, another termination PGND of variable resistance VR3；
The voltage compares output circuit, including voltage comparator U10A, the pin 2 and resistance of voltage comparator U10A
One end of R48 is connected, and the other end of resistance R48 is connect with the tie point of resistance R39, capacitor C11 and resistance R45, voltage ratio
Pin 3 compared with device U10A is connected with one end of resistance R53, and pin 8 is connected with one end of 24V power supply and capacitor C7, and capacitor C7 is another
One termination PGND, pin 4 meet PGND, and pin 1 is connected with pull-up resistor R40 and pull down resistor R46, are connected to the grid of metal-oxide-semiconductor Q6,
Pull-up resistor R40 connects 24V power supply, and pull down resistor R46 meets PGND, and the voltage input of the pin 3 of voltage comparator U10A passes through electricity
The other end of resistance R53 connect realization with the tie point of the pin 7 of isolated amplifier U2 and capacitor C14；
The switch mosfet logic circuit III, including metal-oxide-semiconductor Q6, the source electrode of metal-oxide-semiconductor Q6 meet PGND, metal-oxide-semiconductor Q6's
Drain electrode connects the drain electrode of metal-oxide-semiconductor Q4.
2, the driving current feed circuit, including feedback current sample circuit, instrument amplifier circuit and isolation are put
Big device circuit；
The feedback current sample circuit, including sample resistance R56, R56 one end respectively with the electric current stream of actuator
Outlet is connected with one end of R51, the R56 other end respectively with the drain electrode of power MOS pipe Q8, one end of resistance R43, freewheeling diode
One end of the pin 3 of D6 and resistance R61 are connected, the other end of resistance R51 and resistance R43 respectively with the both ends phase of capacitor C9
Even；
The instrument amplifier circuit, including instrument amplifier U8, the input pin 3 of instrument amplifier U8 and input are drawn
Foot 2 is connected with the both ends of capacitor C9 respectively, resistance R37 and variable resistance VR1 it is in parallel after both ends respectively with instrument amplifier
The pin 1 of U5 is connected with pin 8, and the pin 7 of instrument amplifier U8 is connected with one end of+15V power supply and capacitor C4 respectively, capacitor
Another termination GNDX of C4, the pin 4 of instrument amplifier U8 are connected with one end of -15V power supply and capacitor C13 respectively, capacitor C13
The pin 5 of another termination GNDX, instrument amplifier U8 meet GNDX, and pin 6 is connected with one end of resistance R35, and resistance R35's is another
End is connected with one end of resistance R33, and another termination GNDX of resistance R33, instrument amplifier U8 is by first set 15V power supply power supply；
The isolated amplifier circuit, including one end and the signal isolation amplification of signal isolation amplifier U2, capacitor C14
The pin 7 of device U2 is connected with the tie point of resistance R35, resistance R33, another termination GNDX of capacitor C14, signal isolation amplifier
The pin 4 of U2 meets AGND, and pin 8 meets GNDX, and the pin 1 and pin 5 of signal isolation amplifier U2 connects+15V power supply, 6 He of pin
Pin 2 meets -15V power supply, one end of the 3 connecting resistance R11 of pin of signal isolation amplifier U2, resistance R9, capacitor C1, voltage-stabiliser tube D1
After being connected in parallel, it is connected with the other end of resistance R11, so that the driving current of feedback is exported, resistance R23, capacitor C5, pressure stabilizing
The other end of pipe D3 meets AGND respectively, and the 15V power supply includes that two sets of 15V power supplys being mutually isolated are powered for component, every
Pin 1 and 2 from amplifier U6 is by first set 15V power supply power supply, and the pin 5 and 6 of isolated amplifier U6 is by second set of 15V power supply
Power supply.
3, the pulse feedback circuitry, including optical coupling isolation circuit III；
The optical coupling isolation circuit III includes photoelectrical coupler U11, the pin 2 and metal-oxide-semiconductor Q9's of photoelectrical coupler U11
Drain electrode is connected, and the grid of metal-oxide-semiconductor Q9 is connected with one end of resistance R60, and the other end of resistance R60 is another with resistance R59 respectively
End is connected with one end of resistance R60, and another termination PGND of resistance R59, the source electrode of metal-oxide-semiconductor Q9 meets PGND, photoelectrical coupler U21
Pin 1 connect with the pin 2 of current regulator diode D24, the pin 1 of current regulator diode D24 meets 24V power supply, photoelectrical coupler U11
Pin 3 meet GND, one end of the 4 connecting resistance R63 of pin of photoelectrical coupler U11, another termination power VCC of resistance R63, instead
The driving pulse of feedback is exported from the pin 4 of photoelectrical coupler U11.
4, the emergent stop signal input circuit, including diode D7, the grid of the positive termination metal-oxide-semiconductor Q8 of diode D7
Pole, reversed termination can be set to the output port of low level switching circuit or integrated circuit control system.
Present invention has an advantage that
1, the output of driving logic, component are realized using photoelectrical coupler, MOSFET as main logic inverting element
Type selection is easy, easy to accomplish, and signal strong antijamming capability.
2, system can be adjusted the duty ratio of pwm control signal according to the driving current and driving pulse of feedback,
And then the size of current for adjusting driving proportion electro-magnet realizes the automatic of system to control electromagnetic force adjusting gear rack position
It adjusts.
3, there is excess current protective function, current foldback circuit can control Electromagnetic Control unit low side when current is excessive
Switch Q8 is closed, and is prevented electric current excessive and is damaged circuit.
4, can be by the independent input emergent stop signal of emergent stop signal input circuit when driving circuit breaks down, it will
Metal-oxide-semiconductor Q8 is closed, to cut off the driving current of actuator, and then rack gear is made to return to zero-bit shifting state.
Detailed description of the invention
Fig. 1 is the driving circuit block diagram of diesel engine position model actuator of the invention；
Fig. 2 is the circuit diagram of the driving circuit of diesel engine position model actuator of the invention；
Fig. 3 is the embodiment circuit diagram of the driving circuit of diesel engine position model actuator of the invention；
Fig. 4 is the PWM waveform of input and the PWM waveform of pulse feedback.
Specific embodiment
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
In conjunction with Fig. 1-4, the present invention provides a kind of driving circuits of diesel engine position model actuator, as shown in Figure 1, including
Driving signal input circuit, overcurrent protection circuit, driving current feed circuit, pulse feedback circuitry and emergent stop signal input
Circuit.The driving signal input circuit, including driving pulsewidth input circuit and the enabled input circuit of driving.Fig. 2 is diesel engine
The driver circuit schematic diagram of electromagnetic position formula actuator, the driving pulsewidth input circuit, including I He of optical coupling isolation circuit
Switch mosfet logic circuit I.The optical coupling isolation circuit I includes photoelectrical coupler U7, and the pin 1 of U7 connects pull-up resistor R16
One end, the pin 2 of photoelectrical coupler U7 connect pull-up resistor R57 and integrated circuit control system driving pulsewidth output end connection
Point, the pin 4 of photoelectrical coupler U7 connect 24V power supply, one end of the 3 connecting resistance R21 of pin of photoelectrical coupler U7.Wherein pull-up electricity
Resistance R16 and pull-up resistor R57 meets power supply VCC.The switch mosfet logic circuit I includes NMOS tube Q5, NMOS tube Q5
Grid the connecting resistance R21 other end and R24 one end, another termination PGND of R24, the source electrode of metal-oxide-semiconductor Q5 meets PGND, NMOS tube Q5
Drain electrode connect the tie point of pull-up resistor R22, pull down resistor R25 and resistance R30, another terminating diode D7's of resistance R30
The grid of forward end and NMOS tube Q8.Wherein pull-up resistor R22 connects 24V power supply, and pull down resistor R25 meets PGND.The driving
Enabled input branch, including optical coupling isolation circuit II and switch mosfet logic circuit II.The optical coupling isolation circuit II wraps
Include photoelectrical coupler U6, one end of the 1 connecting resistance R15 of pin of photoelectrical coupler U6, another termination pull down resistor of resistance R15
The tie point of R58 and integrated circuit control system driving enable signal output end, pin 2, the pin 3 of photoelectrical coupler U6 connect
PGND, one end of pin 4 connecting resistance R20, R23, another termination 24V power supply of resistance R20, another termination PGND of resistance R23.
Wherein pull down resistor R58 meets GND.The switch mosfet logic circuit II includes NMOS tube Q4, and the grid of NMOS tube Q4 connects
The tie point that the pin 4 of resistance R23 and photoelectrical coupler U6 connects, the source electrode of NMOS tube Q4 connect PGND, the leakage of NMOS tube Q4
Pole connects the drain electrode of NMOS tube Q5, makes to drive pulsewidth input circuit and drives enabled input circuit in parallel, constitutes driving signal input
Branch.
The model PS2801-1 of described photoelectrical coupler U6, U7, NMOS tube Q4, Q5 model NTD32N06 (see
Fig. 3).
The driving signal input switching circuit, including metal-oxide-semiconductor Q8, the grid of metal-oxide-semiconductor Q8 connect diode D7 and resistance
The tie point of R30, the source electrode ground connection of metal-oxide-semiconductor Q8, the drain electrode of metal-oxide-semiconductor Q8 connect the pin 1 of freewheeling diode D6, sustained diode 6
Pin 2 connect the input terminal and 24V power supply of actuator.The model IRFP250N of the metal-oxide-semiconductor Q8 (see Fig. 3).
When circuit in the initial state, the driving pulsewidth output port of integrated circuit control system and driving make outlet
Mouth is low level, makes two ports by pull-up resistor R57 and pull down resistor R58, is set to high level and low level respectively.
The photoelectrical coupler U7 of driving pulse input branch makes inside U7 due to there is positive pressure difference between 1 pin and 2 pins
LEDs ON shines, internal optoelectronic induction triode induction, 3 pin output current signals through pressure resistance R21,
After the partial pressure of R24, voltage is added in the grid of metal-oxide-semiconductor Q5 and source electrode both ends, metal-oxide-semiconductor Q5 is connected, exports low level.Driving makes
Branch can be inputted, before not inputting driving enable signal, there is no positive pressure difference between the pin 1 and 2 of photoelectrical coupler U6,
The pin 3 of photoelectrical coupler U6 does not export, and the 24V power supply of 4 top of pin is after resistance R20 and R23 partial pressure, in metal-oxide-semiconductor
The grid of Q5 and source electrode both ends add voltage, and metal-oxide-semiconductor Q4 is connected, and export low level " 0 ".
When driving enable signal and driving pulsewidth input signal PWM to export from port, that is, drive enabled input port by
High level becomes low level, and driving pulsewidth input port current potential will make impulse transfer on the basis of original high level.Driving
Enabled input port is set to high level, so that making internal shine between the pin 1 and 2 of photoelectrical coupler U6 there are pressure difference
Diode current flow shines, internal optoelectronic induction triode induction, so that the collector and emitter of triode is similar to short circuit, light
The pin 4 of electric coupler U6 exports low level, and the grid and voltage between source electrodes of metal-oxide-semiconductor Q4 is less than cut-in voltage VGS and turns off, defeated
High level out.When the signal of driving pulse input port is rising edge, i.e. driving pulse input port is set to high level, due to light
The pressure difference of the pin 1 and 2 of electric coupler U7 reduces, so that the lumination of light emitting diode remitted its fury inside U7, optoelectronic induction three
Pole pipe ducting capacity weakens, and the resistance value being equivalent between the pin 3 and 4 of U7 increases, and pin 3 exports low level, the grid of metal-oxide-semiconductor Q5
It is less than cut-in voltage VGS with source voltage and turns off, exports high level.When driving pulsewidth input circuit and the enabled input electricity of driving
When road is high level, it is high level that driving signal, which inputs branch output, after resistance R25 and resistance R30 sampling partial pressure, is made
The voltage for obtaining metal-oxide-semiconductor Q8 grid and source electrode both ends is greater than cut-in voltage VGS and is connected, and driving signal is through 6 He of sustained diode
The driving current of 24V driving power flows into proportion electro-magnet together and generates magnetic field, and magnetic field force pulls rack gear to be displaced.Work as MOS
When pipe Q8 is disconnected, the electric current in actuator is exported by low side, through resistance R56, continued flow tube D6, flows back to actuator, prevents mutation electricity
Pressure damages circuit.
The overcurrent protection circuit, including given reference voltage input circuit, voltage compare output circuit and
Switch mosfet logic circuit III.
The given reference voltage input circuit, including voltage regulator circuit, pressure filter circuit.
One end of the voltage regulator circuit, resistance R31 is connected with 24V power supply, the resistance R31 other end and reference voltage in parallel
One end connection of the pin 1, resistance R39 of device D3, the pin 2 of reference voltage device D2 in parallel meet PGND, reference voltage device D2 in parallel
Pin 3 it is hanging.
The other end of the pressure filter circuit, resistance R39 is connected with capacitor C11, the one end resistance R45, and capacitor C11 is another
One termination PGND, the other end of resistance R45 are connected with one end of variable resistance VR3, another termination of variable resistance VR3
PGND。
The voltage compares output circuit, including voltage comparator U10A, the pin 2 and resistance of voltage comparator U10A
One end of R48 is connected, and the other end of resistance R48 is connect with the tie point of resistance R45, capacitor C11 and resistance R39, voltage ratio
Pin 3 compared with device U10A is connected with one end of resistance R53, and pin 8 is connected with one end of 24V power supply and capacitor C7, and capacitor C7 is another
One termination PGND, pin 4 meet PGND, and pin 1 is connected with pull-up resistor R40 and pull down resistor R46, is connected to the grid of NMOS tube Q6
Pole.Wherein pull-up resistor R40 connects 24V power supply, and pull down resistor R46 meets PGND.The electricity of the pin 3 of the voltage comparator U10A
Pressure input connect realization with the tie point of the pin 7 of isolated amplifier U2 and capacitor C14 by the other end of resistance R53.
The switch mosfet logic circuit III, including NMOS tube Q6, the source electrode of NMOS tube Q6 meet PGND, NMOS tube Q6
Drain electrode connect the drain electrode of NMOS tube Q6.
The model LM4050AEM3-10 of the reference voltage device D3 in parallel, the model of voltage comparator U10A
The model NTD32N06 of LM2903, NMOS tube Q6 (see Fig. 3).
The driving current feed circuit, including feedback current sample circuit, instrument amplifier circuit and isolation amplification
Device circuit.
The feedback current sample circuit, including sample resistance R56, R56 one end respectively with actuator driven electric current
Outflow end be connected with one end of R51, the R56 other end respectively with the drain electrode of power MOS pipe Q8, one end of resistance R43, afterflow two
One end of the pin 3 of pole pipe D6 and resistance R61 are connected, the other end of resistance R51 and resistance R43 both ends with capacitor C9 respectively
It is connected.
The input pin 3 and 2 of the instrument amplifier circuit, including instrument amplifier U8, instrument amplifier U8 is distinguished
Be connected with the both ends of capacitor C9, resistance R37 and variable resistance VR1 it is in parallel after the both ends pin with instrument amplifier U8 respectively
1 is connected with pin 8, and the pin 7 of instrument amplifier U8 is connected with one end of+15V power supply and capacitor C4 respectively, and capacitor C4's is another
Terminate GNDX.The pin 4 of instrument amplifier U8 is connected with one end of -15V power supply and capacitor C13 respectively, another termination of capacitor C13
GNDX.The pin 5 of instrument amplifier U8 meets GNDX, and pin 6 is connected with one end of resistance R35, the other end and resistance of resistance R35
One end of R33 is connected, another termination GNDX of resistance R33.Wherein instrument amplifier U8 is by first set 15V power supply power supply.
The isolated amplifier circuit, including one end and the signal isolation amplification of signal isolation amplifier U2, capacitor C14
The pin 7 of device U2 is connected with the tie point of resistance R35, resistance R33, another termination GNDX of capacitor C14, signal isolation amplifier
The pin 4 of U2 meets AGND, and pin 8 meets GNDX, and the pin 1 and pin 5 of signal isolation amplifier U2 connects+15V power supply, 6 He of pin
Pin 2 meets -15V power supply, one end of the 3 connecting resistance R11 of pin of signal isolation amplifier U2, resistance R9, capacitor C1, voltage-stabiliser tube D1
After being connected in parallel, it is connected with the other end of resistance R11, to export the driving current of feedback.Wherein resistance R9, capacitor C1,
The other end of voltage-stabiliser tube D1 meets AGND respectively.The 15V power supply includes that two sets of 15V power supplys being mutually isolated supply for component
Electricity.Wherein the pin 1 and 2 of isolated amplifier U2 is by first set 15V power supply power supply, and the pin 5 and 6 of isolated amplifier U2 is by second
Cover 15V power supply power supply.
The model ISO122 of the model INA128 of the instrument amplifier U8, isolated amplifier U2, voltage-stabiliser tube D1
Model ZMM5 (see Fig. 3).
In overcurrent protection circuit, the voltage of 24V power supply forms pressure difference by resistance R31, and reference voltage device D3 in parallel makes
The pressure difference for obtaining the both ends resistance R31 keeps stablizing, to export stable electric current.The low pass being made up of resistance R39 and capacitor C11
Filter circuit, and by resistance R45 and variable resistance VR3 series connection partial pressure, voltage comparator U10A is input to through resistance R48 sampling
Reverse input end pin 2.By adjusting the resistance value of VR3, may be implemented to adjust the voltage of voltage comparator reverse input end.
The positive input pin 3 of amplifier is connected through resistance R53 with the output end of the instrumentation amplifier of driving current feed circuit,
It is inputted after resistance R53 sampling.When operating current is less than given reference current, i.e. the input of voltage comparator pin 3 is electric
When pressure is less than the input voltage of pin 2, voltage comparator pin 1 exports low level, and metal-oxide-semiconductor Q6 cut-off exports high level.Work as work
When making electric current greater than given reference current, i.e., when the input voltage of voltage comparator pin 3 is greater than the input voltage of pin 2,
The pin 1 of voltage comparator exports high level, so that metal-oxide-semiconductor Q6 is connected, exports low level.Drive pulsewidth input branch, driving
It is in parallel between enabled input branch and overcurrent protection circuit three to constitute "AND" relationship, when overcurrent protection circuit protection is dynamic
When making, i.e. when metal-oxide-semiconductor Q6 exports low level " 0 ", the gate source voltage of metal-oxide-semiconductor Q8 becomes low level, less than its cut-in voltage VGS
Cut-off, cuts off actuator driven electric current, and actuator stops working.Table 1 gives driving pulsewidth input branch, the enabled input of driving
The switching logic of branch and overcurrent protection circuit control metal-oxide-semiconductor Q8.Wherein " 1 " indicates output high level and Q8 conducting, " 0 "
Indicate output low level and Q8 cut-off.
In current feedback circuit, resistance R56 is sampled the operating current of actuator, through resistance R51, R43 and capacitor
After the filter circuit filtering of C9 composition, it is input to the positive input pin 3 and reversed input pin 4 of instrumentation amplifier U5, instrument is used
Gain (can be set as by the gain of amplifier by being connected in parallel on the variable resistance VR1 adjusting at the both ends resistance R37 in the present embodiment
10, i.e., according to G=1+50k Ω/RGResistance R30 and variable resistance parallel connection resistance value are adjusted to 5.56k Ω), electricity is exported by pin 6
Pressure value inputs the pin 7 of isolated amplifier U2, isolation amplification after resistance R35, resistance R33 and capacitor C14 divider filter
Device U2 is modulated demodulation, the interference such as the noise and ripple of shielding transmission current signal to current signal, and amplifies current signal
It is exported by pin 3, after resistance R11, R9 and capacitor C1 divider filter, is transported to integrated circuit control through voltage-stablizer D1 pressure stabilizing
In system,.By the duty ratio of the pwm control signal of the adjustable output of feedback current, and then electricity is driven in adjusting actuator
Size is flowed, to control the displacement that the size of electromagnetic force controls rack gear, the fuel delivery of diesel engine is adjusted, realizes closed-loop current control
The pulse feedback circuitry, including optical coupling isolation circuit III.
The optical coupling isolation circuit III includes photoelectrical coupler U11, the pin 2 and metal-oxide-semiconductor Q9's of photoelectrical coupler U11
Drain electrode is connected, and the grid of metal-oxide-semiconductor Q9 is connected with one end of resistance R60, and the other end of resistance R60 is another with resistance R61 respectively
End is connected with one end of resistance R59, and another termination PGND of resistance R59, the source electrode of metal-oxide-semiconductor Q9 meets PGND.Photoelectrical coupler U1
Pin 1 connect with the pin 2 of current regulator diode D24, the pin 1 of current regulator diode D24 meets 24V power supply, photoelectrical coupler U1
Pin 3 meet GND, one end of the 4 connecting resistance R63 of pin of photoelectrical coupler U1, another termination power VCC of resistance R63, feedback
Driving pulse be output in integrated circuit control system from the pin 4 of photoelectrical coupler U11.
The model BSS138 of photoelectrical coupler U11 the model PS2801-1, metal-oxide-semiconductor Q9 (see Fig. 3).
When (driving pulse is high level) is connected in metal-oxide-semiconductor Q8, the drain electrode of metal-oxide-semiconductor Q8 exports low level, the grid voltage of Q9
It is pulled low, the voltage between the grid and source electrode of Q9 is less than cut-in voltage VGS, closes Q9, shining inside photoelectrical coupler U11
There is no forward voltage drops between the pin 1 and pin 2 of diode without shining, and phototriode is closed, and exports high electricity from pin 4
It is flat.When metal-oxide-semiconductor Q8 turns off (driving pulse is low level), the grid of Q9 is in high level, the voltage between the grid and source electrode of Q9
It is connected greater than cut-in voltage VGS, Q9, there is positive pressure difference between the pin 1 and 2 of the light emitting diode in photoelectrical coupler U11
And be connected and shine, since the effect of current regulator diode D24 keeps pressure difference to stablize, phototriode is inducing luminous and is connected, from drawing
Foot 4 exports low level, so that feedback one feedback signal back identical with the pwm signal duty ratio of input gives integrated circuit control
System processed adjusts the duty ratio of the pwm signal of input, as shown in Fig. 4.
Table 1
Claims (5)
1. a kind of driving circuit of diesel engine position control formula actuator, it is characterized in that: including driving signal input circuit, excessively electric
Stream protection circuit, driving current feed circuit, pulse feedback circuitry and emergent stop signal input circuit；
The driving signal input circuit includes driving pulsewidth input branch, the enabled input branch of driving and driving signal input
Switching circuit；
The driving pulsewidth inputs branch, including optical coupling isolation circuit I and switch mosfet logic circuit I；The optocoupler
Isolation circuit I includes photoelectrical coupler U7, and the pin 1 of U7 connects the one end for drawing R16, and the pin 2 of photoelectrical coupler U7 connects drawing
The tie point of the driving pulsewidth output end of resistance R57 and integrated circuit control system, 3 connecting resistance of pin of photoelectrical coupler U7
One end of R21, the pin 4 of photoelectrical coupler U7 connect 24V power supply, and pull-up resistor R57 and pull-up resistor R16 are all connected with power supply VCC；
The switch mosfet logic circuit I include metal-oxide-semiconductor Q5, one end of grid the connecting resistance R21 other end and R24 of metal-oxide-semiconductor Q5,
Another termination PGND of R24, the source electrode of metal-oxide-semiconductor Q5 meet PGND, the drain electrode of metal-oxide-semiconductor Q5 connect pull-up resistor R22, pull down resistor R25 and
The tie point of resistance R30, the forward end of another terminating diode D7 of resistance R30 and the grid of metal-oxide-semiconductor Q8, pull-up resistor R22
24V power supply is connect, pull down resistor R25 meets PGND；
The enabled input branch of the driving, including optical coupling isolation circuit II and switch mosfet logic circuit II；The light
Coupling isolation circuit II includes photoelectrical coupler U6, and one end of the 1 connecting resistance R15 of pin of photoelectrical coupler U6, resistance R15's is another
The tie point of pull down resistor R58 and integrated circuit control system driving enable signal output end are terminated, photoelectrical coupler U6's draws
Foot 2, pin 3 meet PGND, and one end of pin 4 connecting resistance R20, R23, another termination 24V power supply of resistance R20, resistance R23's is another
One termination PGND, pull down resistor R58 meets GND；The switch mosfet logic circuit II includes metal-oxide-semiconductor Q4, the grid of metal-oxide-semiconductor Q4
The tie point that the pin 4 of pole connecting resistance R23 and photoelectrical coupler U6 connect, the source electrode of metal-oxide-semiconductor Q4 meet PGND, metal-oxide-semiconductor Q4's
Drain electrode connects the drain electrode of metal-oxide-semiconductor Q5；
The driving signal input switching circuit, including metal-oxide-semiconductor Q8, the grid of metal-oxide-semiconductor Q8 connect diode D7's and resistance R30
Tie point, the source electrode of metal-oxide-semiconductor Q8 meet PGND, and the drain electrode of metal-oxide-semiconductor Q8 connects the pin 1 of freewheeling diode D6, sustained diode 6
Pin 2 connects the input terminal and 24V power supply of actuator.
2. the driving circuit of a kind of diesel engine position control formula actuator according to claim 1, it is characterized in that: described
Overcurrent protection circuit, including given reference voltage input circuit, voltage compare output circuit and switch mosfet logic circuit
Ⅲ；
The given reference voltage input circuit, including voltage regulator circuit, pressure filter circuit；The voltage regulator circuit, resistance
One end of R31 is connected with 24V power supply, and the resistance R31 other end connects with one end of the pin 1 of reference voltage device D3 in parallel, resistance R39
It connects, the pin 2 of reference voltage device D3 in parallel meets PGND, and the pin 3 of reference voltage device D2 in parallel is hanging；The divider filter electricity
The other end on road, resistance R39 is connected with capacitor C11, the one end resistance R45, and another termination PGND of capacitor C11, resistance R45's is another
End is connected with one end of variable resistance VR3, another termination PGND of variable resistance VR3；
The voltage compares output circuit, including voltage comparator U10A, the pin 2 and resistance R48 of voltage comparator U10A
One end be connected, the other end of resistance R48 is connect with the tie point of resistance R39, capacitor C11 and resistance R45, voltage comparator
The pin 3 of U10A is connected with one end of resistance R53, and pin 8 is connected with one end of 24V power supply and capacitor C7, the capacitor C7 other end
PGND is met, pin 4 meets PGND, and pin 1 is connected with pull-up resistor R40 and pull down resistor R46, is connected to the grid of metal-oxide-semiconductor Q6, pulls up
Resistance R40 connects 24V power supply, and pull down resistor R46 meets PGND, and the voltage input of the pin 3 of voltage comparator U10A passes through resistance R53
The other end connect realization with the tie point of the pin 7 of isolated amplifier U2 and capacitor C14；
The switch mosfet logic circuit III, including metal-oxide-semiconductor Q6, the source electrode of metal-oxide-semiconductor Q6 connect PGND, the drain electrode of metal-oxide-semiconductor Q6
Connect the drain electrode of metal-oxide-semiconductor Q4.
3. the driving circuit of a kind of diesel engine position control formula actuator according to claim 2, it is characterized in that: described
Driving current feed circuit, including feedback current sample circuit, instrument amplifier circuit and isolated amplifier circuit；
The feedback current sample circuit, including sample resistance R56, R56 one end respectively with the electric current outflow end of actuator
Be connected with one end of R51, the R56 other end respectively with the drain electrode of power MOS pipe Q8, one end of resistance R43, sustained diode 6
One end of pin 3 and resistance R61 are connected, and the other end of resistance R51 and resistance R43 are connected with the both ends of capacitor C9 respectively；
The instrument amplifier circuit, including instrument amplifier U8, the input pin 3 and input pin 2 of instrument amplifier U8
Be connected respectively with the both ends of capacitor C9, resistance R37 and variable resistance VR1 it is in parallel after both ends respectively with instrument amplifier U5's
Pin 1 is connected with pin 8, and the pin 7 of instrument amplifier U8 is connected with one end of+15V power supply and capacitor C4 respectively, capacitor C4's
The pin 4 of another termination GNDX, instrument amplifier U8 are connected with one end of -15V power supply and capacitor C13 respectively, and capacitor C13 is another
Terminate GNDX, the pin 5 of instrument amplifier U8 meets GNDX, and pin 6 is connected with one end of resistance R35, the other end of resistance R35 and
One end of resistance R33 is connected, and another termination GNDX of resistance R33, instrument amplifier U8 is by first set 15V power supply power supply；
The isolated amplifier circuit, including one end and the signal isolation amplifier U2 of signal isolation amplifier U2, capacitor C14
Pin 7 be connected with the tie point of resistance R35, resistance R33, another termination GNDX of capacitor C14, signal isolation amplifier U2's
Pin 4 meets AGND, and pin 8 meets GNDX, and the pin 1 and pin 5 of signal isolation amplifier U2 connects+15V power supply, pin 6 and pin 2
- 15V power supply is connect, one end of the 3 connecting resistance R11 of pin of signal isolation amplifier U2, resistance R9, capacitor C1, voltage-stabiliser tube D1 are in parallel
After connection, it is connected with the other end of resistance R11, so that the driving current of feedback is exported, resistance R23, capacitor C5, voltage-stabiliser tube D3
The other end meet AGND respectively, the 15V power supply includes that two sets 15V power supplys being mutually isolated are that component is powered, and isolation is put
By first set 15V power supply power supply, the pin 5 and 6 of isolated amplifier U6 is supplied the pin 1 and 2 of big device U6 by second set of 15V power supply
Electricity.
4. the driving circuit of a kind of diesel engine position control formula actuator according to claim 3, it is characterized in that: described
Pulse feedback circuitry, including optical coupling isolation circuit III；
The optical coupling isolation circuit III includes photoelectrical coupler U11, the drain electrode of the pin 2 and metal-oxide-semiconductor Q9 of photoelectrical coupler U11
Be connected, the grid of metal-oxide-semiconductor Q9 is connected with one end of resistance R60, the other end of resistance R60 respectively with the other end of resistance R59 and
One end of resistance R60 is connected, and another termination PGND of resistance R59, the source electrode of metal-oxide-semiconductor Q9 meets PGND, and photoelectrical coupler U21's draws
Foot 1 is connect with the pin 2 of current regulator diode D24, and the pin 1 of current regulator diode D24 connects 24V power supply, and photoelectrical coupler U11's draws
Foot 3 meets GND, one end of the 4 connecting resistance R63 of pin of photoelectrical coupler U11, another termination power VCC of resistance R63, feedback
Driving pulse is exported from the pin 4 of photoelectrical coupler U11.
5. the driving circuit of a kind of diesel engine position control formula actuator according to claim 4, it is characterized in that: described
Emergent stop signal input circuit, including diode D7, the grid of the positive termination metal-oxide-semiconductor Q8 of diode D7, reversed termination can be set to
The output port of low level switching circuit or integrated circuit control system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565661A (en) * | 2021-07-23 | 2021-10-29 | 武汉天富海科技发展有限公司 | Electromagnetic valve drive control device of intelligent electric control booster pump |
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