CN108386288A - Fuel injector driving device - Google Patents
Fuel injector driving device Download PDFInfo
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- CN108386288A CN108386288A CN201810156922.XA CN201810156922A CN108386288A CN 108386288 A CN108386288 A CN 108386288A CN 201810156922 A CN201810156922 A CN 201810156922A CN 108386288 A CN108386288 A CN 108386288A
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- 239000000446 fuel Substances 0.000 title claims abstract description 208
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 239000003921 oil Substances 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 239000000295 fuel oil Substances 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 6
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- 230000006399 behavior Effects 0.000 description 13
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- 238000005516 engineering process Methods 0.000 description 7
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- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
-
- 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
- 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
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
This disclosure relates to a kind of fuel injector driving device.For driving fuel injector to spray fuel oil into cylinder, which includes the device：Power supply module provides first voltage or second voltage, second voltage is more than first voltage according to first control signal for fuel injector；Current detection module, the electric current to flowing through fuel injector is detected, and output electric current measure result；Oil spout behavior monitoring module is monitored the oil spout behavior of fuel injector, obtains behavior monitoring result；Control module receives the second control signal that engine control system is sent out, and according to current detecting result, behavior monitoring result and second control signal, determines that fuel injector carries out fuel-injected initial time and injection duration, and generate first control signal.The arrangement achieves being accurately controlled to fuel injector progress fuel-injected, the normal work of fuel injector ensure that.
Description
Technical field
This disclosure relates to field of engine control more particularly to a kind of fuel injector driving device.
Background technology
ECU (Electronic Control Unit) electronic control unit, also known as " car running computer ", " vehicle-mounted computer " etc..
It is then automobile specified microcomputerized controller from purposes.The operation principle of ECU be according in its memory program and data to each
The analog or digital signal of kind sensor and switch carries out processing, operation and judgement accordingly, and then output control signal goes to drive
Move various actuators.Usually, the electric routing power of ECU, input signal processing, main control unit and output signal driving, communication
Etc. modules composition.
Fuel injector is the critical component of electric control fuel oil jet system, it is the least significant end of entire fuel system, controls plan
Slightly refer to control the characteristic for the fuel oil that engine chamber is ejected into from fuel injector, including distributive value, injection timing, injection pressure
And injection rate.
ECU designs are main to build the hardware system for meeting application demand using commercial chip.In the related technology, using point
Vertical chip builds fuel injector drive system, but such system complexity height, poor reliability, of high cost.In complicated electromagnetic environment
Under harsh application environment, the failure of any one discrete component may all cause traffic accident.Meanwhile as application needs
The cylinder number of the continuous promotion asked, engine is more and more, is more raised difficult questions using the method that separate chip builds fuel injector drive system
To adapt to the trend.
Invention content
In view of this, the present disclosure proposes a kind of fuel injector driving devices.
According to the one side of the disclosure, provide a kind of fuel injector driving device, described device for drive fuel injector to
Fuel oil is sprayed in cylinder, described device includes：
Power supply module provides first voltage or second voltage according to first control signal for the fuel injector, and described second
Voltage is more than the first voltage；
Current detection module, the electric current to flowing through the fuel injector is detected, and output electric current measure result；
Oil spout behavior monitoring module is monitored the oil spout behavior of the fuel injector, obtains behavior monitoring result；
Control module receives the second control signal that engine control system is sent out, and the second control signal includes institute
The running parameter of engine and the type parameter of the fuel injector are stated,
The control module is configured as：
According to the current detecting result and the behavior monitoring as a result, determining the working condition of the fuel injector；
According to the working condition of the fuel injector, the working condition of described device and the second control signal, determine
The fuel injector carries out fuel-injected initial time and injection duration, and generates the first control signal,
Wherein, the first control signal includes the first voltage or second voltage needed for the fuel injector, first voltage
Or the power-on time corresponding to second voltage and duty ratio.
For above-mentioned apparatus, in one possible implementation, described device further includes：
2 current-modulation modules, the electric current that the electric current for flowing through the fuel injector is adjusted according to the current detecting result are slow
Stagnant value, to reduce the fluctuation for the electric current for flowing through the fuel injector.
For above-mentioned apparatus, in one possible implementation, the current detection module, including：First amplifier
With the second amplifier,
The in-phase input end and inverting input of first amplifier are respectively used to obtain the first input letter to be detected
Number and the second input signal, the output end of first amplifier connect with the in-phase input end of second amplifier；
The output end of second amplifier exports the current detecting result.
For above-mentioned apparatus, in one possible implementation, the current detection module further includes：Signal is decayed
Circuit, third amplifier, first resistor and second resistance,
The signal attenuation circuit carries out difference mode signal decaying to first input signal and second input signal,
By after decaying the first input signal and the second input signal input the in-phase input end and reverse phase of first amplifier respectively
Input terminal；
The input terminal of the third amplifier is connect with the output end of first amplifier, the third amplifier it is defeated
Outlet is connected by the first resistor and the second resistance and the in-phase input end and inverting input of first amplifier
It connects, to reduce the common-mode voltage range of first amplifier.
For above-mentioned apparatus, in one possible implementation, the current detection module further includes：Low-pass filtering electricity
Road and/or gain adjustment circuit, to be filtered to current detecting result and/or gain process.
For above-mentioned apparatus, in one possible implementation, in the case where the engine is multicylinder engine,
The fuel injector be it is multiple, the second control signal further include select cylinder control signal and clock signal, described device further include：
Cylinder control module is selected, cylinder control signal and the clock signal is selected according to described, controls each fuel injector to correspondence
Engine air cylinder injection fuel oil.
For above-mentioned apparatus, in one possible implementation, the power supply module, including：Gate driving submodule,
Boosting inverter submodule and power supply submodule,
The boosting inverter submodule is used to provide the second voltage for the fuel injector, and the power supply submodule is used for
First voltage is provided for the fuel injector,
The gate driving submodule, including：
High-voltage driving circuit, for according to the first control signal, being drivingly connected the boosting inverter submodule
One transistor, so that the boosting inverter submodule provides described by the first transistor of conducting for the fuel injector
Two voltages；
Low-voltage driving circuit, for according to the first control signal, be drivingly connected the power supply submodule second to be brilliant
Body pipe, so that the power supply submodule provides the first voltage by the second transistor of conducting for the fuel injector；
Cylinder driving circuit is selected, for according to the first control signal, driving is described to select cylinder control module.
For above-mentioned apparatus, in one possible implementation, the gate driving submodule further includes bootstrap capacitor
Circuit, the power supply module further include charge pump,
The control module is additionally operable to the duty ratio in the first voltage or second voltage for being determined as the fuel injector power supply
In the case of more than or equal to duty cycle threshold, controls the charge pump and charge for the bootstrap capacitor circuit；
The bootstrap capacitor circuit is oneself in the bootstrap capacitor circuit in the case where being powered by the charge pump
Capacitor charging is lifted, ensures the normal work of the high-voltage driving circuit or the low-voltage driving circuit.
For above-mentioned apparatus, in one possible implementation, described device further includes：
D/A converter module, the configuration ginseng for configuring described device sent out for receiving the engine control system
Number carries out digital-to-analogue conversion to the configuration parameter, so that control module is based on transformed configuration parameter configuration described device,
Wherein, the configuration parameter include control the fuel injector carry out fuel-injected nozzle parameter and/or with it is described
The relevant boosting parameter of power supply module.
For above-mentioned apparatus, in one possible implementation, described device further includes：
Protection module is monitored for the working condition to described device, in the case where there is exception in described device,
Control described device is stopped, to protect described device.
The fuel injector driving device provided according to the disclosure, can detect fuel injector electric current and oil spout behavior with determination
The working condition of fuel injector, according to fuel injector working condition, the working condition of driving device and from engine control system
Control signal determines the initial time and injection duration of fuel injector injection, and generates control signal and be to control power supply module
Fuel injector provides high voltage or low-voltage, is accurately controlled to fuel injector progress fuel-injected to realize, ensure that oil spout
The normal work of device.
According to below with reference to the accompanying drawings to detailed description of illustrative embodiments, the other feature and aspect of the disclosure will become
It is clear.
Description of the drawings
Including in the description and the attached drawing of a part for constitution instruction and specification together illustrate the disclosure
Exemplary embodiment, feature and aspect, and for explaining the principles of this disclosure.
Fig. 1 shows the structural schematic diagram of the fuel injector driving device according to one embodiment of the disclosure；
Fig. 2 shows the driving logical schematics according to the fuel injector driving device of one embodiment of the disclosure；
Fig. 3 shows the structural schematic diagram of the fuel injector driving device according to one embodiment of the disclosure；
Fig. 4 shows the structural schematic diagram of the fuel injector driving device according to one embodiment of the disclosure；
Fig. 5 shows the electrical block diagram of the power supply module of the fuel injector driving device according to one embodiment of the disclosure；
Fig. 6 shows the electrical block diagram of the power supply module of the fuel injector driving device according to one embodiment of the disclosure；
Fig. 7 shows the circuit structure signal of the bootstrap capacitor circuit of the fuel injector driving device according to one embodiment of the disclosure
Figure；
Fig. 8 shows the circuit structure signal of the current detection module of the fuel injector driving device according to one embodiment of the disclosure
Figure；
Fig. 9 shows the circuit structure signal of the current detection module of the fuel injector driving device according to one embodiment of the disclosure
Figure；
Figure 10 shows the electrical block diagram of the application scenarios of the fuel injector driving device according to one embodiment of the disclosure.
Specific implementation mode
Various exemplary embodiments, feature and the aspect of the disclosure are described in detail below with reference to attached drawing.It is identical in attached drawing
Reference numeral indicate functionally the same or similar element.Although the various aspects of embodiment are shown in the accompanying drawings, remove
It non-specifically points out, it is not necessary to attached drawing drawn to scale.
Dedicated word " exemplary " means " being used as example, embodiment or illustrative " herein.Here as " exemplary "
Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.
In addition, in order to better illustrate the disclosure, numerous details is given in specific implementation mode below.
It will be appreciated by those skilled in the art that without certain details, the disclosure can equally be implemented.In some instances, for
Method, means, element and circuit well known to those skilled in the art are not described in detail, in order to highlight the purport of the disclosure.
Fuel injector for engine usually may include solenoid valve fuel injector and piezo electric valve fuel injector.
For electromagnetic fuel injector, to ensure that the response speed of fuel injector, generally use twin voltage type of drive are sprayed to drive
Oily device.During driving fuel injector, the high pressure that battery tension and boost module provide gates stage by stage, while coordinating tune
Signal processed completes the driving to fuel injector.In the starting stage, it need to use larger peak point current that can just make solenoid valve quick closedown；
After solenoid closure, the smaller maintenance electric current of use can make solenoid valve maintain closed state.In solenoid closure process
It is middle to need larger peak point current, only it is difficult to meet the requirements by Vehicular accumulator cell (being usually 12V or 24V) power supply.Thus, usually
Cell voltage is increased to by one higher horizontal (50V or 75V) using DC/DC boost modules, in solenoid closure rank
Section provides peak point current, and the solenoid valve maintenance stage is provided by accumulator and maintains electric current.
For piezo electric valve fuel injector, according to inverse piezoelectric effect, piezo-electric crystal extends under the action of piling up electric field, due to amplification
After the upper surface area of chamber is more than lower surface area, thus axial elongation is by displacement amplifier, deformation is amplified and passes through work
Plug acts on control valve；Control valve moves down and blocks the connection of high-pressure oil passage and low pressure oil way, and high pressure oil pushes needle at this time
Valve body overcomes the spring force in back pressure cavity to move up to open fuel injector and commencement of fuel injection；After electric field removal, piezoelectricity
Crystal heap restores former long, and piston moves up under spring force, and high and low pressure oil communication, needle-valve is under spring force
Return, at this time fuel injector closing, terminates oil spout.
In other words, it for solenoid valve fuel injector and piezo electric valve fuel injector, drives it to carry out fuel oil injection and is required to height
Voltage and low-voltage.
Fig. 1 shows the structural schematic diagram of the fuel injector driving device according to one embodiment of the disclosure.As shown in Figure 1, the dress
It sets and sprays fuel oil into cylinder for controlling fuel injector.The device includes power supply module 11, current detection module 12, spray
Oily behavior monitoring module 13 and control module 14.
Power supply module 11 provides first voltage or second voltage according to first control signal, for fuel injector, and second voltage is big
In first voltage.Current detection module 12 is detected the electric current for flowing through fuel injector, and output electric current measure result.Oil spout row
The oil spout behavior of fuel injector is monitored for monitoring modular 13, obtains behavior monitoring result.Control module 14 receives engine
The second control signal that control device is sent out, second control signal may include the running parameter of engine and the type of fuel injector
Parameter.Control module 14 is configured as：According to current detecting result and behavior monitoring as a result, determining the working condition of fuel injector；
According to the working condition of fuel injector, the working condition of device and second control signal, determine that fuel injector carries out fuel-injected
Initial time and injection duration, and generate first control signal.Wherein, first control signal includes needed for fuel injector
Power-on time corresponding to one voltage or second voltage, first voltage or second voltage and duty ratio.
In the present embodiment, power supply module is additionally operable to power for fuel injector driving device, provides the voltage needed for it.According to
The difference of voltage needed for fuel injector and fuel injector driving device, can be powered by different modes, for example, can lead to
It crosses accumulator, booster etc. and required voltage is provided.Wherein, to protect fuel injector driving device, band-gap reference can also be passed through
(Bandgap voltage reference, abbreviation Bandgap) and low pressure difference linear voltage regulator (low dropout
Regulator, abbreviation LDO) required voltage is provided for fuel injector driving device.It is filled in this manner it is achieved that being driven to fuel injector
Under-voltage reset, electrification reset, overvoltage protection, overheat protector and overcurrent protection for setting etc..Satisfaction can also be provided with LDO in band-gap reference
The first voltage of fuel injector low-voltage end power demands (i.e. low pressure flash power demands), for example, the first voltage of 24V.May be used also
Meet the first voltage of low-voltage end power demands to be provided as fuel injector by accumulator.DC/DC boosting inverters may be used
Device, which is converted to the boost in voltage by accumulator or band-gap reference and LDO inputs, meets fuel injector high voltage end power demands
The second voltage of (i.e. high pressure flash power demands), for example, the second voltage of 75V.
In the present embodiment, current detection module can be to fuel injector high voltage end, fuel injector low-voltage end, DC/DC liters
Buckling parallel operation etc. carries out current detecting, obtains current detecting result.Oil spout behavior monitoring module can play the oil spout of fuel injector
The oil spouts behaviors such as moment beginning, finish time, injection duration are monitored, and obtain behavior monitoring result.
In the present embodiment, the running parameter of the engine in second control signal may include the rotating speed of engine, institute
The MAP chart (engine ignition control curve graph required under various operating modes, referred to as MAP chart) etc. of the distributive value, engine that need
With the relevant information of work of engine.The type parameter of fuel injector may include the type of fuel injector, drive needed for fuel injector
The relevant parameter of work with fuel injector of high voltage (i.e. second voltage) and low-voltage (i.e. first voltage) etc..Art technology
Personnel can according to actual needs be configured content included in second control signal, and the disclosure is not restricted this.
In the present embodiment, control module can be according to current detecting result, oil spout behavior monitoring as a result, determining fuel injector
The working conditions such as fuel-injected initial time and finish time are carried out, and the second control sent out with engine control system is believed
Number, it is pre-set for combinations such as the fuel injector drive control algorithms of fuel injector, determine that fuel injector carries out fuel-injected and rises
Begin moment and injection duration, and generates first control signal with this.Realize the oil injection time and fuel injection duration to fuel injector
Time accurately controls.Can also be determined according to the working condition of fuel injector fuel injector whether failure, in the feelings that it breaks down
It under condition, is handled accordingly, protects fuel injector.
Control module can also determine it according to current detecting result corresponding with DC/DC booster converters is detected
The state of switch ways is handled accordingly in the case where it is abnormal, and then is realized to DC/DC booster converters
Protection.Also, control module can also be corresponding with fuel injector high voltage end, fuel injector low-voltage end according to detecting
Current detecting result judges the state of fuel injector, realizes the protection to fuel injector and fault diagnosis.
Fig. 2 shows the driving logical schematics according to the fuel injector driving device of one embodiment of the disclosure.As shown in Fig. 2,
In first time section t0~t1, second voltage U2 is provided for fuel injector, will be flowed through in first time section t0~t1
The electric current of fuel injector is increased to the first electric current I1.In second time interval t1~t2 after first time section t0~t1,
The first voltage U1 that first duty ratio is provided for fuel injector, to control the spray for flowing through fuel injector in second time interval t1~t2
Radio stream is the first electric current I1.In third time interval t2~t3 after second time interval t1~t2, carried for fuel injector
For the first voltage U1 of the second duty ratio, the electric current of fuel injector is flowed through as the second electricity to be controlled in third time interval t2~t3
Flow I2.Wherein, the first duty ratio is more than the second duty ratio, and the first electric current I1 is more than the second electric current I2.
In the present embodiment, control module can be by PWM (Pulse Width Modulation) control technology pair
The duty ratio of one voltage and second voltage is controlled, to realize modulation to the electric current for flowing through fuel injector, so that device can be with
Fuel oil injection is carried out according to logical drive fuel injector shown in Fig. 2.
In the present embodiment, fuel injector can be solenoid valve fuel injector, piezo electric valve fuel injector, and the disclosure does not limit this
System.Engine can be single-cylinder engine, can also be multicylinder engine.For example, the hairs such as two cylinders, four cylinders, 2 × 4 cylinders, 1 × 8 cylinder
Motor.Engine can be only there are one air cylinder group in-line multi-cylinder engine, can also be there are two air cylinder group V-type or its
The engine of his type.Moreover, engine can be diesel engine, petrol engine.Engine can be applied to automobile, boat
The fields such as sky.For example, diesel oil direct-injection (Diesel Direct Injection, abbreviation DDI) and gasoline direct (Gasoline
Direct Injection, abbreviation GDI).The fuel injector driving device that the disclosure is provided can be applied to variety classes, use
On the way, the engine of cylinder number, those skilled in the art can be configured fuel injector driving device according to the difference of engine, this
It is open that this is not restricted.
In the present embodiment, SPI (Serial Peripheral can be passed through between each module and control module
Interface, Serial Peripheral Interface (SPI)) carry out data transmission transmission with signal instruction.Control module can also pass through SPI interface
Carry out data transmission the transmission with signal instruction with engine control system.
Fig. 3 shows the structural schematic diagram of the fuel injector driving device according to one embodiment of the disclosure.
In one possible implementation, as shown in figure 3, fuel injector driving device can also include 2 current-modulations
Module 15.2 current-modulation modules 15 flow through the electric current hysteresis of the electric current of fuel injector according to the adjustment of current detecting result,
To reduce the fluctuation for the electric current for flowing through fuel injector.
In the present embodiment, after fuel injector enters PWM current-modulation states, according to current detecting result to the slow of electric current
Stagnant value is configured, and can reduce the shake of oil-fuel injector needle-valve caused by the fluctuation of fuel injector electric current, and then improves fuel injector combustion
The stability of oil spurts.
Fig. 4 shows the structural schematic diagram of the fuel injector driving device according to one embodiment of the disclosure.
In one possible implementation, as shown in figure 4, in the case where engine is multicylinder engine, fuel injector
To be multiple, second control signal further includes selecting cylinder control signal and clock signal, and device can also include selecting cylinder control module 16.
It selects cylinder control module 16 according to cylinder control signal and clock signal is selected, controls each fuel injector and sprayed into corresponding cylinder
Penetrate fuel oil.
In the realization method, the clock signal needed for it can be exported to corresponding fuel injector by timer etc..When
Clock signal is used to provide time reference for corresponding digital circuit in fuel injector and fuel injector driving device, to accurately control spray
The fuel injection processes of oily device.It may include needing progress fuel-injected fuel injector and fuel injector institute right to select cylinder control signal
The cylinder etc. answered.
In the present embodiment, for multicylinder engine, which can also include finite state machine (Finite State
Machine, abbreviation FSM), the result detected by each module is sent to control module by SPI interface.
Fig. 5 shows the electrical block diagram of the power supply module of the fuel injector driving device according to one embodiment of the disclosure.
Fig. 6 shows the electrical block diagram of the power supply module of the fuel injector driving device according to one embodiment of the disclosure.
In one possible implementation, as shown in figure 5, power supply module 11 may include gate driving submodule 111,
Boosting inverter submodule 112 and power supply submodule 113.Boosting inverter submodule 112 is used to provide second voltage for fuel injector, electricity
Source submodule 113 is used to provide first voltage for fuel injector.
Wherein, as shown in fig. 6, gate driving submodule 111 may include high-voltage driving circuit 1111, low-voltage driving circuit
1112 and select cylinder driving circuit 1113.
High-voltage driving circuit 1111 is used to, according to first control signal, be drivingly connected the first of boosting inverter submodule 112
Transistor (not shown), so that boosting inverter submodule 112 provides second voltage by the first transistor of conducting for fuel injector.
Realize high pressure flash (high voltage end) driving of fuel injector.
Low-voltage driving circuit 1112 is used to, according to first control signal, be drivingly connected the second crystal of power supply submodule 113
Pipe (not shown), so that power supply submodule 113 provides first voltage by the second transistor of conducting for fuel injector.Realize oil spout
The low pressure flash (low-voltage end) of device drives.
Select cylinder driving circuit 1113 for according to first control signal, cylinder control module 16 to be selected in driving.Realize fuel injector
Cylinder signal is selected to drive.
In the realization method, the first transistor can be connected to the high voltage end of fuel injector, high-voltage driving circuit driving
The grid of the first transistor, driving the first transistor conducting, and then boosting inverter submodule can be made to power for the first transistor,
To achieve the purpose that provide second voltage to fuel injector.Second transistor can be connected to the low-voltage end of fuel injector, and low pressure is driven
The grid of dynamic circuit drives second transistor, driving second transistor conducting, and then power supply submodule can be made to be the second crystal
Pipe is powered, to achieve the purpose that provide first voltage to fuel injector.Those skilled in the art can be according to actual needs to first
Transistor and second transistor are configured, or replace with other devices, and the disclosure is not restricted this.
In the realization method, power supply submodule may include band-gap reference (Bandgap voltage reference,
Abbreviation Bandgap) and low pressure difference linear voltage regulator (low dropout regulator, abbreviation LDO).Power supply submodule may be used also
Think that fuel injector driving device carries out the required operating voltage that works.In this manner it is achieved that the under-voltage of fuel injector driving device
Reset, electrification reset, overvoltage protection, overheat protector and overcurrent protection etc..Boosting inverter submodule may include that DC/DC boostings become
Parallel operation.DC/DC booster converters may be used, satisfaction spray is converted to the voltage of battery tension or band-gap reference and LDO inputs
The second voltage of the grid power demands of the first transistor of oily device high voltage end, for example, the second voltage of 75V.
In the realization method, in the case where engine is single-cylinder engine, gate driving submodule can also include
High-voltage driving circuit, low-voltage driving circuit and select cylinder driving circuit.
In the realization method, the engine of different cylinder numbers can be needed according to its engine to high drive electricity
Road, low-voltage driving circuit and the quantity progress matched design for selecting cylinder driving circuit, the disclosure are not restricted this.
Fig. 7 shows the circuit structure signal of the bootstrap capacitor circuit of the fuel injector driving device according to one embodiment of the disclosure
Figure.
In one possible implementation, as shown in fig. 7, gate driving submodule 111 can also include bootstrap capacitor
Circuit 1114, power supply module 11 can also include charge pump 114.Control module 14 is additionally operable to be determined as the of fuel injector power supply
In the case that the duty ratio of one voltage or second voltage is greater than or equal to duty cycle threshold, control charge pump 114 is bootstrap capacitor
Circuit 1114 charges.Bootstrap capacitor circuit 1114 is in bootstrap capacitor circuit 1114 in the case where being powered by charge pump 114
Bootstrap capacitor (the first capacitance CB1 and the second capacitance CB2 as shown in Figure 7) charges, and ensures high-voltage driving circuit 1111 or low
Pressing driving circuit 1112, (i.e. the duty ratio of first voltage or second voltage is greater than or equal to duty ratio threshold in high duty ratio condition
Value) under normal work.Those skilled in the art can according to actual needs be configured duty cycle threshold, and the disclosure is to this
It is not restricted.
In the realization method, as shown in fig. 7, when (input signal can be height as shown in FIG. 6 to input signal IN=0
The input signal HVHS of driving circuit is pressed, or can be the input signal LVHS of low-voltage driving circuit as shown in FIG. 6) when,
LSO (output signal of level translator (Level Shifter Output), wherein level translator be used for input signal into
Line level is converted) into low level, output signal OUT is shorted to ground by transistor MN3.First supply voltage V1 is by the first capacitance
CB1 charges to U1=V1-VFDB1, the second capacitance CB2 are charged to U2=V2-VFDB2.Wherein, VFDB1 and VFDB2 is respectively
The conducting voltage of one diode DB1 and the second diode CB2.
As shown in fig. 7, as input signal IN=1, LSO is high level, and transistor MN1, transistor MN3 are disconnected, crystal
Pipe MN2 is connected.Second capacitance CB2 is directly connected to the grid G of transistor MN2 by transistor MN4, and passes through buffer by LSO
B4 is controlled.Transistor MN4 is opened and is started the grid G charging to transistor MN2.When reaching, NAND gate NAND1 shutdowns are electric
Usually, transistor MP1 is connected, and the grid G of transistor MN2 is full of by the first capacitance CB1.In the voltage of the grid G of transistor MN2
During raising, the gate source voltage of transistor MN4 is reduced and is finally turned off.Output signal OUT rises to Vdrv.One or two pole
Pipe DB1, which prevents the first capacitance CB1 from discharging into the first supply voltage V1, the second diode DB2, prevents the second capacitance CB2 from discharging into
Two supply voltage V2.Transistor MP2 is begun to turn on, because node VB2 is more than threshold voltage vt h, transistor MP2 is from the second electricity
The charge for holding CB2 is available.Second capacitance CB2 discharges into the grid G of the first capacitance CB1, transistor MN2.First capacitance CB1,
Charge balance occurs between two capacitance CB2 and any additional load capacitance.The first transistor and/or second transistor (not shown)
Gate charge provided by Vdrv.The voltage VCB1 of first capacitance CB1 more stablizes, because the grid G of transistor MN2 starts to fill
Current peak caused by electricity is provided by the second capacitance CB2, and the influence to the voltage VCB1 of the first capacitance CB1 is little.
Wherein, the transistor MP2 of high pressure is removable.Because the transistor MP1 of low pressure is tended to remain on, work as grid
When submodule being driven to open, if transistor MP2 is removed, the second capacitance CB2 is disconnected from the first capacitance CB1.Capacitor is real
The charge of existing voltage drop Vdrop can be calculate by the following formula：
Qtot=C*Vdrop。
Wherein, QtotFor the total charge dosage of capacitor, C is the capacitance of capacitor, VdropFor the voltage drop at capacitor both ends.
In the realization method, the first supply voltage V1 can be 5V, and the second supply voltage V2 can be 15V.Second electricity
Voltage more higher than the first capacitance CB1 can be charged to by holding CB2, and in parallel with the first capacitance CB1.Second capacitance CB2 is from VCB2
The value of=V2-V1 is discharged, because larger voltage drop Vdrop leads to the higher quantity of electric charge, it is possible to use smaller first
Capacitance CB1.In this way, even if there is the presence of the second capacitance CB2, but because the first capacitance CB1 is smaller, can equally save chip face
Product.
In this way, can chip interior be integrated in the bootstrap capacitor circuit that the high voltage end of gate driving submodule drives
Scheme has smaller area, improves the integrated level of chip, while reducing system cost, improves fuel injector driving device
Reliability.
In the realization method, for most of packaging technologies, low pressure and high-voltage capacitor can be in different works
It is realized in skill layer, and there is different capacitance densities.PIP capacitor device or polysilicon electricity can be used on the first capacitance CB1
Container can be stacked mutually on the second capacitance CB2 using the MIM capacitor on metal layer, two such capacitor.Also,
Area in the first capacitance and the second capacitance is identical, can obtain the efficient layout of maximum area.
In such a way that bootstrap capacitor is integrated in inside so that fuel injector high voltage end driver does not need oneself outside piece
Lift capacitance.It, can be in piece loong shunt bootstrap capacitor as in chankings when the power supply capacity deficiency of bootstrap capacitor.The fuel injector is special
It needs microcontroller to be configured by SPI interface with integrated driving device, while microcontroller being needed to provide clock signal, with
Ensure that the Digital Logical Circuits in piece is working properly.
In one possible implementation, as shown in figure 4, the device can also include D/A converter module 17.The number
Mould conversion module 17 carries out configuration parameter for receiving the configuration parameter for configuration device that engine control system is sent out
Digital-to-analogue conversion, so that control module is based on transformed configuration parameter configuration device.Wherein, configuration parameter includes control fuel injector
Carry out fuel-injected nozzle parameter and/or with the relevant boosting parameter of power supply module.
In one possible implementation, as shown in Figure 3, Figure 4, which can also include protection module 18.Protection
Module 18 is for being monitored the working condition of the device, in the case where exception occurs in the device, controls device stopping
Work, to protect the device.
In the realization method, protection module 18 includes overvoltage protection, overcurrent protection, excess temperature guarantor to the protection of the device
Shield, under-voltage protection etc., for different protection types, protection module further includes the detection to realize needed for different defencive functions
Circuit is monitored the electric current, voltage, temperature etc. of device, in the case where exception occurs in monitoring result, controls the device and stops
It only works, to protect the device.Those skilled in the art can according to actual needs be configured protection module, the disclosure pair
This is not restricted.
Fig. 8 shows the circuit structure signal of the current detection module of the fuel injector driving device according to one embodiment of the disclosure
Figure.
In one possible implementation, as shown in figure 8, the current detection module 12 may include the first amplifier A1
With the second amplifier A2.
The in-phase input end and inverting input of first amplifier A1 is respectively used to obtain the first input signal to be detected
IN+ and the second input signal IN-, the output end of the first amplifier A1 are connect with the in-phase input end of the second amplifier A2.Second
The output end output electric current measure result OUT of amplifier A2.
Wherein, current detection module is the adjustable programmable gain amplifier of amplification factor (PGA), can be joined by being arranged
Number is so that current detection module has different amplification factors, it is ensured that can be widely applied for different fuel injectors.In big common mode
The voltage differences of normal phase input end and inverting input are amplified and are filtered under voltage conditions.First amplifier can be poor
It can be buffer amplifier to divide amplifier, the second amplifier.
It, can be according to offset drift, DC maladjustment, common-mode input voltage range, operating voltage model in the realization method
Enclose with the key design parameters such as common-mode rejection ratio, and be conjointly employed in the EMI being likely to occur in engine and ESD etc. and cause device
The mechanism of failure is configured the parameter of current detection module.
Fig. 9 shows the circuit structure signal of the current detection module of the fuel injector driving device according to one embodiment of the disclosure
Figure.
In one possible implementation, as shown in figure 9, current detection module 12 can also include signal attenuation circuit
121, third amplifier A3, first resistor RCM1 and second resistance RCM2.
Signal attenuation circuit 121 carries out difference mode signal decaying to the IN+ and the second input signal IN-, after decaying
First input signal IN+ and the second input signal IN- input respectively the first amplifier A1 in-phase input end and reverse phase it is defeated
Enter end.The input terminal of the third amplifier A3 is connect with the output end of the first amplifier A1, the third amplifier A3
The output end in-phase input end that passes through the first resistor RCM1 and second resistance RCM2 and the first amplifier A1
It is connected with inverting input, to reduce the common-mode voltage range of the first amplifier A1.
Wherein, as shown in figure 9, by R1, the signal attenuation circuit of R2, R3 and R4 compositions apply identical network degradation
To the first input signal IN+ and the second input signal IN-.When the signal width of the first input signal IN+ and the second input signal IN-
When spending equal, the output end of the first amplifier A1 is equal to common-mode voltage, and two attenuators constitute balance bridge network.It is applied to first
Any common-mode voltage of two input terminals of amplifier A1 can keep bridge balance so that the output of the first amplifier A1 is 0.
Resistor network is accurately matched, can make the first amplifier A1 to the inhibition of common-mode signal close to perfect condition.
In the signal difference of in-phase input end and inverting input for being applied to the first amplifier A1, the first amplifier A1
By adjusting its output to drive resistance R2 to respond the voltage of its inverting input by resistance R4, until itself and homophase input
The voltage at end matches.
In this way, may insure even if the defeated of the first input signal IN+ and the second input signal IN- by signal attenuation circuit
Enter level more than supply voltage or be less than ground voltage, the input of the first amplifier A1 remains in power range, inputs net
Network can decay differential mode voltage.Resistance R3 and resistance R4 form an attenuator, can scale the feedback of the first amplifier A1, by force
Compel big output signal to go to balance relatively small Differential Input.It can set the first amplifier A1's by adjusting resistance ratios
Gain.For example, the gain of A1 can be set between 10~25.
In the realization method, since differential input signal is attenuated, it is then amplified the overall gain of generation 10~25, the
One amplifier A1 noise gains and input offset voltage may be relatively high.In order to while extending common mode range to greatest extent
Ground reduces these errors, can be applied to the first amplifier A1's using the feedback control loop including third amplifier to reduce
Common-mode voltage range.The voltage range of compensator is applied to by offsetting, input common-mode range is also offset to include than power supply
The more negative voltage of voltage.
Wherein, third amplifier A3 detections are applied to the common-mode signal of the first amplifier A1, and adjust matched first electricity
The voltage on RCM1 and second resistance RCM2 is hindered, to reduce the common-mode voltage range of the first amplifier A1 input terminals.By adjusting
The common-mode voltage of first resistor RCM1 and second resistance RCM2 can expand common-mode input range, while reduce normal mode letter
Number decaying, to improve the performance of input.
In the realization method, the output of the first amplifier A1 can drive the second amplifier A2, the second amplifier A2's
Gain can be 2, can be realized by the accurate matching of feedback resistance RF1 and feedback resistance RF2.
In one possible implementation, current detection module 12 can also include：Low-pass filter circuit and/or gain
Adjustment circuit, to be filtered to current detecting result and/or gain process.
In the realization method, low-pass filter circuit can be increased between the first amplifier A1 and the second amplifier A2
And/or gain adjustment circuit.As shown in Figure 7, Figure 8, low-pass filter circuit and/or gain adjustment circuit can be connected to first
Between the output terminals A 1O of amplifier A1 and the in-phase input end A2I of the second amplifier A2.
It should be understood that those skilled in the art can according to actual needs be configured current detection module, this
It is open that this is not restricted.
In the present embodiment, fuel injector driving device can be integrated as needed, by all or part therein
Module is integrated in same chip, and the disclosure is not restricted this.
The fuel injector driving device that the embodiment of the present disclosure is provided, the working condition based on fuel injector, according to flowing through oil spout
The characteristic of the electric current of device judges the corresponding current waveform of fuel injector, can be good at the oil injection time for controlling fuel injector, in conjunction with
At the end of injection moment of fuel injector, accurately calculate distributive value.Realization accurately controls fuel-injected, while can reduce
Influence of the deviation of injector characteristics to engine performance improves the consistency of engine performance, reduces to fuel injector consistency
Requirement.Integrated level is high, reliability is high, at low cost, can be used for the solenoid valve fuel injector in all kinds of engines and piezo electric valve spray
Oily device, it is applied widely.
Using example
Below in conjunction with the fuel injector driving device of four cylinder engine " be used for " property application scenarios as an example, root is provided
According to the application example of the embodiment of the present disclosure, in order to understand the operation principle and process of fuel injector driving device.Art technology
Personnel should be understood that it is following using example merely for the sake of the purpose for being easy to understand the embodiment of the present disclosure, be not construed as to the disclosure
The limitation of embodiment.
Figure 10 shows the electrical block diagram of the application scenarios of the fuel injector driving device according to one embodiment of the disclosure.
As shown in Figure 10, fuel injector driving device can be integrated in same chip.The fuel injector driving device is sent out applied to four cylinders
Motivation needs to be configured each module in device, e.g., in power supply module may include two high pressures according to four cylinder engine
Driving circuit and two low-voltage driving circuits are driven with the driving of high pressure flash and low pressure flash of realizing four fuel injectors.The dress
It sets and can be also used for 8 Cylinder engines, can support two groups of cylinders, can be used for V-type engine and straight engine, it only need to be to device
The quantity of each module carries out corresponding setting, and the disclosure is not listed here example.Also, due to by bootstrap capacitor circuit
It is integrated in the chip interior of oil spout driving device, high-voltage driving circuit does not need the bootstrap capacitor outside piece.Fuel injector driving dress
It sets and control module is needed to be configured by SPI interface, while needing to provide clock signal, to ensure the electricity of the Digital Logic in piece
Road is working properly.
The presently disclosed embodiments is described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport
In the principle, practical application or technological improvement to the technology in market for best explaining each embodiment, or this technology is made to lead
Other those of ordinary skill in domain can understand each embodiment disclosed herein.
Claims (10)
1. a kind of fuel injector driving device, which is characterized in that described device is for driving fuel injector to be sprayed into cylinder
Fuel oil, described device include：
Power supply module provides first voltage or second voltage, the second voltage according to first control signal for the fuel injector
More than the first voltage；
Current detection module, the electric current to flowing through the fuel injector is detected, and output electric current measure result；
Oil spout behavior monitoring module is monitored the oil spout behavior of the fuel injector, obtains behavior monitoring result；
Control module receives the second control signal that engine control system is sent out, and the second control signal includes the hair
The type parameter of the running parameter of motivation and the fuel injector,
The control module is configured as：
According to the current detecting result and the behavior monitoring as a result, determining the working condition of the fuel injector；
According to the working condition of the fuel injector, the working condition of described device and the second control signal, determine described in
Fuel injector carries out fuel-injected initial time and injection duration, and generates the first control signal,
Wherein, the first control signal includes the first voltage or second voltage needed for the fuel injector, first voltage or
Power-on time corresponding to two voltages and duty ratio.
2. the apparatus according to claim 1, which is characterized in that described device further includes：
2 current-modulation modules, the electric current that the electric current of the fuel injector is flowed through according to current detecting result adjustment are sluggish
Value, to reduce the fluctuation for the electric current for flowing through the fuel injector.
3. the apparatus according to claim 1, which is characterized in that the current detection module, including：First amplifier and
Two amplifiers,
The in-phase input end and inverting input of first amplifier, be respectively used to obtain the first input signal to be detected and
Second input signal, the output end of first amplifier are connect with the in-phase input end of second amplifier；
The output end of second amplifier exports the current detecting result.
4. device according to claim 3, which is characterized in that the current detection module further includes：Signal decaying electricity
Road, third amplifier, first resistor and second resistance,
The signal attenuation circuit carries out difference mode signal decaying to first input signal and second input signal, will decline
The first input signal and the second input signal after subtracting input the in-phase input end and anti-phase input of first amplifier respectively
End；
The input terminal of the third amplifier is connect with the output end of first amplifier, the output end of the third amplifier
It is connect with the in-phase input end of first amplifier and inverting input by the first resistor and the second resistance, with
Reduce the common-mode voltage range of first amplifier.
5. device according to claim 3 or 4, which is characterized in that the current detection module further includes：Low-pass filtering electricity
Road and/or gain adjustment circuit, to be filtered to current detecting result and/or gain process.
6. the apparatus according to claim 1, which is characterized in that in the case where the engine is multicylinder engine, institute
State fuel injector be it is multiple, the second control signal further include select cylinder control signal and clock signal, described device further include：
Cylinder control module is selected, cylinder control signal and the clock signal is selected according to described, controls each fuel injector to corresponding hair
Motivation in-cylinder injection fuel oil.
7. device according to claim 6, which is characterized in that the power supply module, including：Gate driving submodule rises
Transformation submodule and power supply submodule are pressed,
The boosting inverter submodule is used to provide the second voltage for the fuel injector, and the power supply submodule is used for as institute
It states fuel injector and first voltage is provided,
The gate driving submodule, including：
High-voltage driving circuit, for according to the first control signal, be drivingly connected the boosting inverter submodule first to be brilliant
Body pipe, so that the boosting inverter submodule provides second electricity by the first transistor of conducting for the fuel injector
Pressure；
Low-voltage driving circuit, for according to the first control signal, being drivingly connected the second transistor of the power supply submodule,
So that the power supply submodule provides the first voltage by the second transistor of conducting for the fuel injector；
Cylinder driving circuit is selected, for according to the first control signal, driving is described to select cylinder control module.
8. device according to claim 7, which is characterized in that the gate driving submodule further includes bootstrap capacitor electricity
Road, the power supply module further include charge pump,
The control module is additionally operable to be more than in the duty ratio of the first voltage or second voltage that are determined as the fuel injector power supply
Or it charges for the bootstrap capacitor circuit equal to the charge pump in the case of duty cycle threshold, is controlled；
The bootstrap capacitor circuit is the bootstrapping electricity in the bootstrap capacitor circuit in the case where being powered by the charge pump
Capacity charge ensures the normal work of the high-voltage driving circuit or the low-voltage driving circuit.
9. device according to claim 6, which is characterized in that described device further includes：
D/A converter module, the configuration parameter for configuring described device sent out for receiving the engine control system,
Digital-to-analogue conversion is carried out to the configuration parameter, so that control module is based on transformed configuration parameter configuration described device,
Wherein, the configuration parameter include control the fuel injector carry out fuel-injected nozzle parameter and/or with the power supply
The relevant boosting parameter of module.
10. the apparatus according to claim 1, which is characterized in that described device further includes：
Protection module is monitored for the working condition to described device, in the case where there is exception in described device, control
Described device is stopped, to protect described device.
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| CN110318899A (en) * | 2019-06-20 | 2019-10-11 | 河南美力达汽车有限公司 | A kind of hybrid vehicle fuel injection control system and method |
| CN112081699A (en) * | 2020-09-04 | 2020-12-15 | 中国重汽集团济南动力有限公司 | Method and device for detecting opening timing of electric control oil injector |
| CN112327079A (en) * | 2020-10-30 | 2021-02-05 | 广西玉柴机器股份有限公司 | Method for determining performance of injection hardware in diesel engine controller |
| CN114060161A (en) * | 2020-07-30 | 2022-02-18 | 日立安斯泰莫汽车系统(苏州)有限公司 | Boost protection device, boost protection method and computer readable medium |
| CN114738152A (en) * | 2022-04-24 | 2022-07-12 | 一汽解放汽车有限公司 | Fuel injection system and control method thereof |
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