CN109519291A - A kind of high pressure co-rail system inlet metering valve flow control system and control method - Google Patents
A kind of high pressure co-rail system inlet metering valve flow control system and control method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004364 calculation method Methods 0.000 claims abstract description 88
- 238000006073 displacement reaction Methods 0.000 claims abstract description 63
- 239000000446 fuel Substances 0.000 claims abstract description 55
- 239000000523 sample Substances 0.000 claims abstract description 33
- 230000008859 change Effects 0.000 claims abstract description 7
- 239000000295 fuel oil Substances 0.000 claims description 47
- 210000001367 artery Anatomy 0.000 claims description 33
- 210000003462 vein Anatomy 0.000 claims description 33
- 239000003921 oil Substances 0.000 claims description 30
- 238000012545 processing Methods 0.000 claims description 12
- 238000004804 winding Methods 0.000 claims description 11
- 238000013016 damping Methods 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
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- 230000005611 electricity Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 claims 1
- 239000002828 fuel tank Substances 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000013178 mathematical model Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
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- 238000011161 development Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
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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
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
-
- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
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Abstract
The invention discloses a kind of high pressure co-rail system inlet metering valve flow control system and control methods, connect the fuel temperature sensor being arranged in the electronic controlled diesel, rail pressure sensor, speed probe, accelerator open degree sensor and barometric pressure sensor with driving calculating mould signal by including flow rate calculation module, variable structure PID module, displacement computing module.Advantage is: need not use dedicated position sensor or flow sensor, and it directlys adopt electronic controlled diesel and has the signal source of fuel temperature sensor, rail pressure sensor, speed probe, accelerator open degree sensor and barometric pressure sensor as inlet metering valve flow control, without the existing system structure of change, it is convenient and easy, it is low in cost, it is conducive to implement.
Description
Technical field
The present invention relates to the technical fields of the control strategy of Design of High Pressure Common Rail Diesel Engine inlet metering and control method, especially relate to
And a kind of high pressure co-rail system inlet metering valve flow control system and control method.
Background technique
The aggravation of environmental pollution and the exposed day by day of energy crisis, emission regulation is increasingly harsh, promotes electronic controlled diesel
Development.High pressure co-rail system becomes future diesel machine Fuel System due to accurate, the flexible modulation of injection pressure and fuel injection characteristic
The developing direction of system.High-pressure common rail oil feed pump inlet metering valve is one of important component of high pressure co-rail system, and effect is root
The amount of fuel entered in high-pressure common rail oil feed pump plunger cavity is measured according to the demand of common rail pressure, controls the oil inlet of high-pressure pump
Amount, keeps the amount of fuel for being transported to oily rail consistent with the demand of system, meets the requirement of rail pressure stability, dynamic response etc..
Since the main function of inlet metering valve is to adjust oil inlet quantity, the flow control of inlet metering valve is its most important property
Can, the quality of flow control is directly related to the stability of high pressure co-rail system rail pressure control, dynamic response etc..
Inlet metering valve is linear scale valve.The power of coil magnetic field, coil magnetic field are determined by the size of current of coil
The strong and weak electromagnetic force size for determining to generate in armature, then determine armature position.Armature pushes valve core movement by mandril, makes
The overflow section variation of valve port is obtained, so that the flow continuously proportionally follow current variation for passing through valve port.Because of coil
Resistance is basically unchanged, and is just determined by the voltage at coil both ends by the size of current of coil.Electromagnet is by pulse width modulated wave (PWM)
Voltage pulse driving, adjust duty ratio change between 0%-100%, make electromagnet average driving current generate variation,
And then continuous stepless linear regulation is carried out to high-pressure oil pump oil inlet flow.In order to consider cost, high-pressure common rail oil feed pump oil inlet meter
Valve is measured when not including position sensor or flow sensor, can not accurately calculate flow in real time.
Existing control method, such as number of patent application CN201410366774.6, using the target value of rail pressure as mathematical modulo
The input of type, the value that the fuel flow of common rail is left in the operation and leakage which exports fuel injector under target pressure value are made
For the target value of flow；Input using actual measurement rail pressure as mathematical model, calculates the estimated value of output flow；Due to above only
The influence of rail pressure pressure is considered, although realizing that simply model accuracy can be reduced greatly, cause feedforward action unobvious；When accidentally
The calculating that the biggish flow target value of difference and estimated value are controlled as subsequent drive, such as input of nominal function, will lead to rail pressure
Stability and responsiveness it is poor；Due to generating feedback contribution item only with proportional integration (PI) controller, work as engine operating condition
Mutation, when leading to rail pressure target value or oil spout target value mutation, proportional integration (PI) controller responsiveness may be insufficient, causes to flow
Biggish error is likely to occur between the target value and actual value of amount；Since the customized parameter electric current only to metering valve is controlled
System, does not control driving frequency, in engine portion divided working status, such as multi-injection of certain revolving speeds, may result in
Rail pressure pressure oscillation.
The present invention has carried out beneficial exploration and trial thus, has found result of the above problems, will be detailed below being situated between
The scheme to continue is generated under this background.
Summary of the invention
The purpose of the present invention is to provide a kind of high pressure co-rail system inlet metering valve flow control system and control method,
A kind of control algolithm for establishing mathematical models and variable structure PID mixing is proposed, has fuel oil temperature in conjunction with electronic controlled diesel
Sensor, rail pressure sensor, speed probe, accelerator open degree sensor and barometric pressure sensor are spent to perceive electronic controlled diesel
Operating status calculates next operating condition using mathematical models and drives demand, improves response speed；Using variable structure PID according to
Closed loop feedback solves difference caused by load variation and nonlinear disturbance, while reducing overshoot, improves stable state accuracy, reduces
Staking-out work amount.
Technical problem solved by the invention can be realized using following technical scheme:
A kind of high pressure co-rail system inlet metering valve flow control system, including electronic controlled diesel, actuator and processor,
Fuel temperature sensor, rail pressure sensor, speed probe, accelerator open degree sensor and big are provided on the electronic controlled diesel
Air pressure force snesor；The actuator is inlet metering valve, which is characterized in that the processor includes flow rate calculation module, becomes
Structure PID module, displacement computing module and driving computing module；
The accelerator opening amount signal input terminal of the variable structure PID module and the signal output end of the accelerator open degree sensor
Connection, the tach signal input terminal of the variable structure PID module are connect with the tach signal output end of the speed probe, institute
The rail pressure signal input terminal for stating variable structure PID module is connect with the signal output end of the rail pressure sensor；
The modified flow rate signal of the modified flow rate signal input part of the flow rate calculation module and the variable structure PID module
Output end connection, the accelerator opening amount signal input terminal of the flow rate calculation module and the signal of the accelerator open degree sensor export
End connection, the tach signal input terminal of the flow rate calculation module are connect with the tach signal output end of the speed probe,
The atmosphere pressure signal input terminal of the flow rate calculation module is connect with the signal output end of the barometric pressure sensor, described
The fuel oil temperature signal input part of flow rate calculation module is connect with the signal output end of the fuel temperature sensor；
Pressure difference signal input terminal and the valve port of flow rate calculation module front and back before and after the valve port of the displacement computing module
The connection of pressure difference signal output end, the flow signal input terminal of the displacement computing module and the flow of the flow rate calculation module are believed
The connection of number output end, the fuel oil temperature signal input part and the signal of the fuel temperature sensor of the displacement computing module are defeated
Outlet connection；
The displacement signal output end of the displacement signal input terminal of the driving computing module and the displacement computing module connects
It connects, the fuel oil temperature signal input part of the driving computing module is connect with the signal output end of the fuel temperature sensor；
The tach signal input terminal of the driving computing module is connect with the tach signal output end of the speed probe；
The driving signal output end of the driving computing module is connect with the actuator.
A kind of control method of high pressure co-rail system inlet metering valve flow control system, comprising:
Step 1, variable structure PID module is brought according to accelerator open degree sensor accelerator opening amount signal, speed probe
The rail pressure signal that the tach signal and rail pressure sensor brought are brought is input signal, exports modified flow rate after calculation processing
Signal is to flow rate calculation module；
Step 2, flow rate calculation module is exported with the variable structure PID module modified flow rate signal, accelerator open degree sensing
The atmosphere that tach signal that accelerator opening amount signal that device is brought, speed probe are brought, barometric pressure sensor are brought
The fuel oil temperature signal that pressure signal, fuel temperature sensor conveying come is input signal, before exporting valve port after calculation processing
Pressure difference signal and flow signal are to being displaced computing module afterwards；
Valve port front and back pressure difference signal and flow signal that step 3, displacement computing module export with the flow rate calculation module,
The fuel oil temperature signal that comes of fuel temperature sensor conveying is input signal, and output displacement signal is to driving meter after calculation processing
Calculate module；
Step 4, driving computing module is with the displacement signal of the displacement computing module output, fuel temperature sensor conveying
The tach signal that the fuel oil temperature signal and speed probe to come over is brought is input signal, and oil inlet meter is exported after calculation processing
Duty cycle signals needed for measuring valve and PWM switch duration signal.
In a preferred embodiment of the present invention, in step 1, variable structure PID module is sent according to accelerator open degree sensor
The tach signal that the accelerator opening amount signal and speed probe to come over is brought looks into target rail pressure arteries and veins and composes to obtain target rail pressure, amendment
Flow is calculated by variable structure PID module, specific formula for calculation such as formula 1.:
Formula 1. in: QcorFor modified flow rate, e is that target rail pressure subtracts practical rail pressure, KpFor proportional gain, KiFor integral master
Gain, Ki0To integrate variable-gain, KdFor differential gain parameter.
In a preferred embodiment of the present invention, formula 1. in, the proportional gain KpCalculation formula such as formula 2. institute
Show:
Kp=ap+bp(1-exp(-cp|e|)) ②
Formula 2. in: ap、bp、cpBe positive real constant.
In a preferred embodiment of the present invention, formula 1. in, the integral master gain KiCalculation formula such as formula is 3.
It is shown:
Ki=aiexp(-ci|e|) ③
Formula 4. in: ai、ciBe positive real constant；
In a preferred embodiment of the present invention, formula 1. in, the integral variable-gain Ki0Calculation formula such as formula is 4.
It is shown:
Formula 4. in: K0、K1、e0Be positive real constant.
In a preferred embodiment of the present invention, formula 4. in, in order to guarantee Ki0It is that continuously smooth changes, K0、K1、
e0It must satisfy formula 5.:
K1exp(-K0e0)=1 is 5..
In a preferred embodiment of the present invention, formula 1. in, the differential gain KdCalculation formula such as formula is 6.:
Kd=ad-bd(1-exp(-cd|e|)) ⑥
Formula 6. in: ad、bd、cdBe positive real constant, general ad> bd。
In a preferred embodiment of the present invention, in step 2, the calculation method of pressure difference is before and after valve port: using substantially
Pressure difference is multiplied to obtain valve port front and back pressure difference with pressure difference correction factor before and after valve port before and after valve port, wherein being passed through according to speed probe
The tach signal come, pressure characteristic arteries and veins is composed to obtain basic valve port front and back pressure difference before and after looking into valve port；It is sensed according to fuel oil temperature
The atmosphere pressure signal that device conveys the fuel oil temperature signal to come, barometric pressure sensor is brought is input signal, is looked into respectively
Fuel oil amendment arteries and veins spectrum and air pressure amendment arteries and veins are composed to obtain valve port front and back pressure difference correction factor.
In a preferred embodiment of the present invention, in step 2, the calculation method of flow signal is: according to accelerator open degree
The tach signal that the accelerator opening amount signal and speed probe that sensor is brought are brought looks into distributive value arteries and veins and composes to obtain basic flow
Amount；The fuel oil temperature signal that rail pressure signal and the temperature sensor conveying brought according to rail pressure sensor come looks into amount of leakage arteries and veins
Spectrum obtains leakage flow；The modified flow rate signal of variable structure PID module output is added to obtain flow with bare flow, leakage flow
Signal.
In a preferred embodiment of the present invention, in step 3, according to pressure difference before and after the valve port of flow rate calculation module output
Signal and flow signal obtain valve port area of passage by calculating, specific formula for calculation such as formula 7.:
Formula 7. in, Q is the flow m flowed out by valve port3/s；C is valve port flow coefficient；A is effective overcurrent of valve port
Area m2；ΔPVFor the pressure difference MPa at metering valve both ends；ρ is fuel density Kg/m3；The fuel density is sensed according to fuel oil temperature
Device conveys the fuel oil temperature signal to come, looks into fuel density arteries and veins and composes to obtain.
In a preferred embodiment of the present invention, in step 3, according to valve port area of passage by calculating, armature is obtained
Displacement, by taking triangular orifices as an example, specific formula for calculation such as formula 8.:
Formula 8. in, x be armature displacement, m；θ is the angle of triangular orifices apex angle, °；H is throttle orifice on spool
Covering amount m.
In a preferred embodiment of the present invention, in step 4, according to the armature displacement signal of displacement computing module output
By calculating, obtain electromagnetic force, specific formula for calculation such as formula 9.:
Formula 9. in, F be electromagnetic force N；M is armature-spool equivalent movement part quality Kg；C is kinetic damping coefficient N
s/m；K is reset spring rigidity N/m；x0For the pre compressed magnitude m of spring；ffFor viscous friction N；The kinetic damping coefficient root
The fuel oil temperature signal to come is conveyed according to fuel temperature sensor, is looked into kinetic damping coefficient arteries and veins and is composed to obtain.
In a preferred embodiment of the present invention, formula 9. in, the viscous friction ffCalculation formula such as formula is 10.
It is shown:
Formula 10. in, μ be fuel oil dynamic viscosity Pa·s；D is spool internal diameter m；L is practical stream of the liquid in valve chamber
Journey m；R is the radial clearance m of spool and valve body；The fuel power viscosity conveys the fuel oil to come according to fuel temperature sensor
Temperature signal, the dynamic viscosity arteries and veins for looking into fuel oil are composed to obtain.
In a preferred embodiment of the present invention, in step 4, according to the armature displacement signal of displacement computing module output
With electromagnetic force by calculating, required electric current, specific formula for calculation such as formula are obtained
FormulaIn, I is coil current A；δ is working gas gap length m；KfFor equivalent magnetic flux leakage coefficient, Kf=0.24~
0.33×10-3；F is electromagnetic force N；μ0For space permeability, value is 4 π × 10-7Wb/(A·m)；N is coil turn；S is magnetic
Road sectional area m2。
In a preferred embodiment of the present invention, in formulaIn, the working gas gap length δ calculation formula such as formula
FormulaIn, x is armature displacement, m；δ0For initialization gas length, m；.
In a preferred embodiment of the present invention, in step 4, according to the armature displacement signal of displacement computing module output
With electric current by calculating, required driving voltage, specific formula for calculation such as formula are obtained
FormulaIn, U is driving voltage V；I is coil current A；R is equivalent resistance Ω；L is coil equivalent inductance H；Kd
For dynamic raw back EMF coefficient Vs/m；X is that armature is displaced m.
In a preferred embodiment of the present invention, in formulaIn, the equivalent resistance R calculation formula such as formula
FormulaRaFor coil-winding resistance Ω；RbFor equivalent resistance Ω；.
In a preferred embodiment of the present invention, in formulaIn, the equivalent resistance R calculation formula such as formula
Formulaρ is winding wire resistivity Ω m；T is coil working temperature DEG C；LaFor winding wire length m；Sa
For winding wire sectional area m2；The dynamic raw back EMF coefficient KdIt is looked into according to the armature displacement signal of displacement computing module output
Dynamic raw back EMF coefficient arteries and veins is composed to obtain.
In a preferred embodiment of the present invention, in step 4, required drive is obtained divided by supply voltage according to driving voltage
Dynamic duty cycle signals；PWM switch duration arteries and veins is looked into according to the tach signal that speed probe is brought to compose to obtain the switch duration
Signal.
Due to using technical solution as above, the beneficial effects of the present invention are:
1, the present invention need not use dedicated position sensor or flow sensor, and it is existing to directly adopt electronic controlled diesel
Fuel temperature sensor, rail pressure sensor, speed probe, accelerator open degree sensor and barometric pressure sensor are as oil inlet meter
The signal source for measuring valve flow control, it is convenient and easy without the existing system structure of change, it is low in cost, it is conducive to implement.
2, the product provided for the supplier of different inlet metering valves, it is only necessary to change represent flow and driving it is described into
The adjustable parameter of theory relation between oil measurement valve electric signal is especially convenient for implementing in the product of batch production.
3, real-time traffic can be precisely calculated, while reducing staking-out work amount.
4, stability, the dynamic response for improving rail pressure control, advantageously reduce discharge.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of high-pressure common-rail fuel system.
Fig. 2 is the structural schematic diagram for high-pressure common-rail fuel system inlet metering valve.
Fig. 3 is the control method schematic diagram of inlet metering valve flow.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below into
One step illustrates the present invention.
High-pressure common-rail fuel system as shown in Figure 1, including fuel tank 100 and high-pressure oil pump 200, fuel tank 100 pass through a combustion
The connection of oil rectifier 110 is located at the inlet metering device 300 on the oil inlet of high-pressure oil pump 200, has one to overflow on inlet metering device 300
It flows valve 410 and connects fuel tank 100.The oil outlet of high-pressure oil pump 200 connects a common rail pipe 400, and common rail pipe 400 plays the work of accumulator
With common rail pipe 400 connects multiple fuel injectors 500, and the oil return opening of fuel injector 500 connects fuel tank 100, the oil return opening of fuel injector 500
Extra low pressure diesel can be sent back to fuel tank 100 with overflow valve 410.One rail pressure sensor 610 is installed on common rail pipe 400, it is whole
A common rail fuel combustion system is provided with fuel temperature sensor 620, speed probe 630, accelerator open degree sensor 640 and atmospheric pressure
Force snesor 650.There are also an electronic control unit ECU700 will by output output pulse initial point and pulse width control fuel injector 500
Fuel oil sprays into combustion chamber, and electronic control unit ECU700 includes flow rate calculation module 710, variable structure PID module 720, displacement calculating
Module 730 and driving computing module 740, flow rate calculation module 710, variable structure PID module 720, displacement computing module 730 and drive
Dynamic computing module 740 is passed by acquisition rail pressure sensor 610, fuel temperature sensor 620, speed probe 630, accelerator open degree
Sensor 640 and 650 signal of barometric pressure sensor and vehicle network signal, judge system mode by built-in control strategy,
It issues accurate driving signal and drives corresponding component, feed back fuel delivery, rail pressure, oil spout angle and distributive value on demand
It adjusts.
Inlet metering valve 300 as shown in Figure 2, including a valve body 310 and positioned at the mandril 320 and and mandril of valve inner
The integral armature 330 of 320 interference fits, the both ends of mandril 320 are axially moved along bearing 311,312.There is coil 340 in valve body
In 310 and around mandril 320, the size of current of coil 340 determines the power of coil magnetic field, and the strong and weak of coil magnetic field determines rank
The electromagnetic force size generated in iron 330 then determines 330 position of armature.Armature 330 controls mandril 320 and spool 350 is pushed to transport
It is dynamic, change the overflow section in meter in hole 313 between spool 350 and valve body 310, so that passing through the stream of valve port 313
The continuous proportionally follow current of amount changes, and then carries out continuous stepless linear regulation to 200 oil inlet flow of high-pressure oil pump.
Inlet metering valve 300 is divided into open in usual and normally closed type under the conditions of cold.
When inlet metering valve 300 is not powered on, under the effect of spring 360, the flow area in meter in hole 313 is maximum, this
When fuel delivery it is maximum；Then metering valve 300 is powered, and coil 340 is powered, and coil magnetic field constantly becomes by force, and then pushes armature 330,
When armature 330 is greater than the frictional force of spool 350 and the spring force of spring 360, top to the power that spool 350 applies by mandril 320
Bar 320 pushes spool 350 that the flow area in meter in hole 313 is made to become smaller, from inlet metering valve 300 to high-pressure oil pump 200
Oil mass is reduced, and so that high-pressure oil pump 200 is fed the oil mass in common rail pipe 400 and is reduced, high when meter in hole 313 completely closes
Pressure oil pump 200 will stop to 400 fuel feeding of common rail pipe；Armature 330 is equal to spool 350 to the power that spool 350 applies by mandril 320
Frictional force and spring 360 spring force, the flow area in meter in hole 313 becomes a stable opening, one corresponding
Stable flow output.
A kind of control method of high pressure co-rail system inlet metering valve flow control system as shown in Figure 2, comprising:
Step 1, variable structure PID module 720 is brought according to accelerator open degree sensor 640 accelerator opening amount signal, revolving speed
The rail pressure signal that the tach signal and rail pressure sensor 610 that sensor 630 is brought are brought is input signal, after calculation processing
Modified flow rate signal is exported to flow rate calculation module 710；
Step 2, flow rate calculation module 710 is exported with the variable structure PID module 720 modified flow rate signal, fuel oil temperature
Degree sensor 620 conveys the fuel oil temperature signal to come, the atmosphere pressure signal that barometric pressure sensor 650 is brought, rail pressure
The accelerator opening amount signal and speed probe that rail pressure signal that sensor 610 is brought, accelerator open degree sensor 640 are brought
630 tach signals brought are input signal, and pressure difference signal and flow signal extremely displacement before and after valve port are exported after calculation processing
Computing module 730；
Step 3, valve port front and back pressure difference signal and stream that displacement computing module 730 is exported with the flow rate calculation module 710
It is input signal that amount signal, fuel temperature sensor 620, which convey the fuel oil temperature signal to come, and output displacement is believed after calculation processing
Number to driving computing module 740；
Step 4, driving computing module 740 is sensed with displacement signal, the fuel oil temperature that the displacement computing module 730 exports
It is input signal, calculation processing that device 620, which conveys the tach signal that the fuel oil temperature signal to come and speed probe 630 are brought,
Duty cycle signals needed for exporting inlet metering valve afterwards and PWM switch duration signal.
Further, in step 1, variable structure PID module 720 is opened according to the throttle that accelerator open degree sensor 640 is brought
The tach signal that degree signal and speed probe 630 are brought looks into target rail pressure arteries and veins and composes to obtain target rail pressure, and modified flow rate passes through
Variable structure PID module 720 is calculated, specific formula for calculation such as formula 1.:
Formula 1. in: QcorFor modified flow rate, e is that target rail pressure subtracts practical rail pressure, KpFor proportional gain, KiFor integral master
Gain, Ki0To integrate variable-gain, KdFor differential gain parameter.
Further, formula 1. in, the proportional gain KpCalculation formula such as formula is 2. shown:
Kp=ap+bp(1-exp(-cp|e|)) ②
Formula 2. in: ap、bp、cpBe positive real constant.
Further, formula 1. in, the integral master gain KiCalculation formula such as formula is 3. shown:
Ki=aiexp(-ci|e|) ③
Formula 4. in: ai、ciBe positive real constant；
Further, formula 1. in, the integral variable-gain Ki0Calculation formula such as formula is 4. shown:
Formula 4. in: K0、K1、e0Be positive real constant.
Further, formula 4. in, in order to guarantee Ki0It is that continuously smooth changes, K0、K1、e0It must satisfy formula 5.:
K1exp(-K0e0)=1 is 5..
Further, formula 1. in, the differential gain KdCalculation formula such as formula is 6.:
Kd=ad-bd(1-exp(-cd|e|)) ⑥
Formula 6. in: ad、bd、cdBe positive real constant, general ad>bd。
Further, in step 2, the calculation method of pressure difference is before and after valve port: utilizing pressure difference and valve port before and after basic valve port
Front and back pressure difference correction factor is multiplied to obtain valve port front and back pressure difference, wherein being looked into according to the tach signal that speed probe 630 is brought
Pressure characteristic arteries and veins is composed to obtain basic valve port front and back pressure difference before and after valve port；Come according to the conveying of fuel temperature sensor 620
The atmosphere pressure signal that fuel oil temperature signal, barometric pressure sensor 650 are brought is input signal, looks into fuel oil amendment arteries and veins respectively
Spectrum and air pressure amendment arteries and veins are composed to obtain valve port front and back pressure difference correction factor.
Further, in step 2, the calculation method of flow signal is: the oil brought according to accelerator open degree sensor 640
The tach signal that door opening amount signal and speed probe 630 are brought looks into distributive value arteries and veins and composes to obtain bare flow；It is passed according to rail pressure
The fuel oil temperature signal that the conveying of rail pressure signal and temperature sensor that sensor 610 is brought comes, which is looked into amount of leakage arteries and veins and composed, to be revealed
Flow；The modified flow rate signal that variable structure PID module 720 exports is added to obtain flow signal with bare flow, leakage flow.
Further, in step 3, the valve port front and back pressure difference signal and flow signal exported according to flow rate calculation module 710
By calculating, obtain valve port area of passage, specific formula for calculation such as formula 7.:
Formula 7. in, Q is the flow m flowed out by valve port3/s；C is valve port flow coefficient；A is effective overcurrent of valve port
Area m2；ΔPVFor the pressure difference MPa at metering valve both ends；ρ is fuel density Kg/m3；The fuel density is sensed according to fuel oil temperature
Device 620 conveys the fuel oil temperature signal to come, looks into fuel density arteries and veins and composes to obtain.
Further, in step 3, armature displacement is obtained, by calculating with triangular orifices according to valve port area of passage
For, specific formula for calculation such as formula 8.:
Formula 8. in, x be armature displacement, m；θ is the angle of triangular orifices apex angle, °；H is throttle orifice on spool
Covering amount, m.
Further, in step 4, the armature displacement signal exported according to displacement computing module 730 obtains electricity by calculating
Magnetic force, specific formula for calculation such as formula 9.:
Formula 9. in, F is electromagnetic force, N；M is armature-spool equivalent movement part quality Kg；C is kinetic damping coefficient
N·s/m；K is reset spring rigidity N/m；x0For the pre compressed magnitude m of spring；ffFor viscous friction N；The kinetic damping coefficient
The fuel oil temperature signal to come is conveyed according to fuel temperature sensor 620, is looked into kinetic damping coefficient arteries and veins and is composed to obtain.
Further, formula 9. in, the viscous friction ffCalculation formula such as formula is 10. shown:
Formula 10. in, μ be fuel oil dynamic viscosity Pa·s；D is spool internal diameter m；L is practical stream of the liquid in valve chamber
Journey m；R is the radial clearance m of spool and valve body；The fuel power viscosity comes according to the conveying of fuel temperature sensor 620
Fuel oil temperature signal, the dynamic viscosity arteries and veins for looking into fuel oil are composed to obtain.
Further, in step 4, the armature displacement signal and electromagnetic force exported according to displacement computing module 730 is by meter
It calculates, obtains required electric current, specific formula for calculation such as formula
FormulaIn, I is coil current A；δ is working gas gap length m；KfFor equivalent magnetic flux leakage coefficient, Kf=0.24~
0.33×10-3；F is electromagnetic force N；μ0For space permeability, value is 4 π × 10-7Wb/(A·m)；N is coil turn；S is magnetic
Road sectional area m2。
Further, in formulaIn, the working gas gap length δ calculation formula such as formula
FormulaIn, x is armature displacement, m；δ0For initialization gas length, m；.
Further, in step 4, the armature displacement signal and electric current exported according to displacement computing module 730, which passes through, to be calculated,
Obtain required driving voltage, specific formula for calculation such as formula
FormulaIn, U is driving voltage V；I is coil current A；R is equivalent resistance Ω；L is coil equivalent inductance H；Kd
For dynamic raw back EMF coefficient Vs/m；X is that armature is displaced m.
Further, in formulaIn, the equivalent resistance R calculation formula such as formula
FormulaRaFor coil-winding resistance Ω；RbFor equivalent resistance Ω；.
Further, in formulaIn, the equivalent resistance R calculation formula such as formula
Formulaρ is winding wire resistivity Ω m；T is coil working temperature DEG C；LaFor winding wire length m；Sa
For winding wire sectional area m2；The dynamic raw back EMF coefficient KdThe armature displacement signal exported according to displacement computing module 730
Raw back EMF coefficient arteries and veins is looked into compose to obtain.
Further, in step 4, duty cycle signals are driven needed for obtaining according to driving voltage divided by supply voltage；According to
The tach signal that speed probe 630 is brought looks into PWM switch duration arteries and veins and composes to obtain switch duration signal.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (20)
1. a kind of high pressure co-rail system inlet metering valve flow control system, including electronic controlled diesel, actuator and processor, institute
It states and is provided with fuel temperature sensor, rail pressure sensor, speed probe, accelerator open degree sensor and atmosphere on electronic controlled diesel
Pressure sensor；The actuator is inlet metering valve, which is characterized in that the processor includes flow rate calculation module, becomes knot
Structure PID module, displacement computing module and driving computing module；
The accelerator opening amount signal input terminal of the variable structure PID module and the signal output end of the accelerator open degree sensor connect
It connects, the tach signal input terminal of the variable structure PID module is connect with the tach signal output end of the speed probe, described
The rail pressure signal input terminal of variable structure PID module is connect with the signal output end of the rail pressure sensor；
The modified flow rate signal input part of the flow rate calculation module and the modified flow rate signal of the variable structure PID module export
End connection, the accelerator opening amount signal input terminal of the flow rate calculation module and the signal output end of the accelerator open degree sensor connect
It connects, the tach signal input terminal of the flow rate calculation module is connect with the tach signal output end of the speed probe, described
The atmosphere pressure signal input terminal of flow rate calculation module is connect with the signal output end of the barometric pressure sensor, the flow
The fuel oil temperature signal input part of computing module is connect with the signal output end of the fuel temperature sensor；
Pressure difference signal input terminal and the valve port of flow rate calculation module front and back pressure difference before and after the valve port of the displacement computing module
Signal output end connection, the flow signal input terminal of the displacement computing module and the flow signal of the flow rate calculation module are defeated
Outlet connection, the fuel oil temperature signal input part of the displacement computing module and the signal output end of the fuel temperature sensor
Connection；
The displacement signal input terminal of the driving computing module is connect with the displacement signal output end of the displacement computing module, institute
The fuel oil temperature signal input part for stating driving computing module is connect with the signal output end of the fuel temperature sensor；The drive
The tach signal input terminal of dynamic computing module is connect with the tach signal output end of the speed probe；
The driving signal output end of the driving computing module is connect with the actuator.
2. a kind of control method of high pressure co-rail system inlet metering valve flow control system described in claim 1, feature
Be include:
Step 1, variable structure PID module is brought according to accelerator open degree sensor accelerator opening amount signal, speed probe pass through
The rail pressure signal that the tach signal and rail pressure sensor come is brought is input signal, and modified flow rate signal is exported after calculation processing
To flow rate calculation module；
Step 2, flow rate calculation module is exported with the variable structure PID module modified flow rate signal, accelerator open degree sensor are sent
The atmospheric pressure that tach signal that accelerator opening amount signal, the speed probe to come over is brought, barometric pressure sensor are brought
The fuel oil temperature signal that signal, fuel temperature sensor conveying come is input signal, and pressure before and after valve port is exported after calculation processing
Difference signal and flow signal are to being displaced computing module；
Step 3, valve port front and back pressure difference signal and flow signal, fuel oil that displacement computing module is exported with the flow rate calculation module
The fuel oil temperature signal that temperature sensor conveying comes is input signal, and output displacement signal to driving calculates mould after calculation processing
Block；
Step 4, driving computing module is come with the displacement signal of the displacement computing module output, fuel temperature sensor conveying
Fuel oil temperature signal and the tach signal brought of speed probe be input signal, inlet metering valve is exported after calculation processing
Required duty cycle signals and PWM switch duration signal.
3. control method as claimed in claim 2, which is characterized in that in step 1, variable structure PID module is opened according to throttle
The tach signal that the accelerator opening amount signal and speed probe that degree sensor is brought are brought looks into target rail pressure arteries and veins and composes to obtain mesh
Mark rail pressure, modified flow rate is calculated by variable structure PID module, specific formula for calculation such as formula 1.:
Formula 1. in: QcorFor modified flow rate, e is that target rail pressure subtracts practical rail pressure, KpFor proportional gain, KiTo integrate main increasing
Benefit, Ki0To integrate variable-gain, KdFor differential gain parameter.
4. control method as claimed in claim 3, which is characterized in that formula 1. in, the proportional gain KpCalculation formula is such as
Formula is 2. shown:
Kp=ap+bp(1-exp(-cp|e|)) ②
Formula 2. in: ap、bp、cpBe positive real constant.
5. control method as claimed in claim 3, which is characterized in that formula 1. in, the integral master gain KiCalculation formula
As formula 3. shown in:
Ki=aiexp(-ci|e|) ③
Formula 4. in: ai、ciBe positive real constant.
6. control method as claimed in claim 5, which is characterized in that formula 1. in, the integral variable-gain Ki0It calculates public
Formula such as formula is 4. shown:
Formula 4. in: K0、K1、e0Be positive real constant.
7. control method as claimed in claim 6, which is characterized in that formula 4. in, in order to guarantee Ki0It is that continuously smooth becomes
Change, K0、K1、e0It must satisfy formula 5.:
K1exp(-K0e0)=1 is 5..
8. control method as claimed in claim 7, which is characterized in that in a preferred embodiment of the present invention, formula 1.
In, the differential gain KdCalculation formula such as formula is 6.:
Kd=ad-bd(1-exp(-cd|e|)) ⑥
Formula 6. in: ad、bd、cdBe positive real constant, general ad> bd。
9. control method as claimed in claim 2, which is characterized in that in step 2, the calculation method of pressure difference before and after valve port
It is: is multiplied to obtain valve port front and back pressure difference with pressure difference correction factor before and after valve port using pressure difference before and after basic valve port, wherein according to turning
The tach signal that fast sensor is brought, pressure characteristic arteries and veins is composed to obtain basic valve port front and back pressure difference before and after looking into valve port；According to
The atmosphere pressure signal that fuel temperature sensor conveys the fuel oil temperature signal to come, barometric pressure sensor is brought is input
Signal, looks into fuel oil amendment arteries and veins spectrum respectively and air pressure amendment arteries and veins is composed to obtain valve port front and back pressure difference correction factor.
10. control method as claimed in claim 9, which is characterized in that in step 2, the calculation method of flow signal is: root
The tach signal that the accelerator opening amount signal and speed probe brought according to accelerator open degree sensor are brought looks into distributive value arteries and veins spectrum
Obtain bare flow；The rail pressure signal and temperature sensor brought according to rail pressure sensor convey the fuel oil temperature signal to come
Amount of leakage arteries and veins is looked into compose to obtain leakage flow；The modified flow rate signal of variable structure PID module output and bare flow, leakage flow phase
Add to obtain flow signal.
11. control method as claimed in claim 2, which is characterized in that in step 3, according to the output of flow rate calculation module
Pressure difference signal and flow signal be by calculating before and after valve port, obtains valve port area of passage, specific formula for calculation such as formula 7.:
Formula 7. in, Q is the flow m flowed out by valve port3/s；C is valve port flow coefficient；A is effective area of passage of valve port
m2；ΔPVFor the pressure difference MPa at metering valve both ends；ρ is fuel density Kg/m3；The fuel density is defeated according to fuel temperature sensor
The fuel oil temperature signal brought looks into fuel density arteries and veins and composes to obtain.
12. control method as claimed in claim 11, which is characterized in that in step 3, according to valve port area of passage by counting
Calculate, obtain armature displacement, by taking triangular orifices as an example, specific formula for calculation such as formula 8.:
Formula 8. in, x be armature displacement, m；θ is the angle of triangular orifices apex angle, °；H is the covering of throttle orifice on spool
Measure m.
13. control method as claimed in claim 2, which is characterized in that in step 4, according to displacement computing module output
Armature displacement signal obtains electromagnetic force by calculating, specific formula for calculation such as formula 9.:
Formula 9. in, F be electromagnetic force N；M is armature-spool equivalent movement part quality Kg；C is kinetic damping coefficient Ns/m；
K is reset spring rigidity N/m；x0For the pre compressed magnitude m of spring；ffFor viscous friction N；The kinetic damping coefficient is according to combustion
Oil temperature sensor conveys the fuel oil temperature signal to come, looks into kinetic damping coefficient arteries and veins and composes to obtain.
14. control method as claimed in claim 13, which is characterized in that formula 9. in, the viscous friction ffIt calculates public
Formula such as formula (shown in 10.:
Formula 10. in, μ be fuel oil dynamic viscosity Pa·s；D is spool internal diameter m；L is practical process m of the liquid in valve chamber；r
For the radial clearance m of spool and valve body；The fuel power viscosity conveys the fuel oil temperature to come according to fuel temperature sensor
Signal, the dynamic viscosity arteries and veins for looking into fuel oil are composed to obtain.
15. control method as claimed in claim 14, which is characterized in that in step 4, according to displacement computing module output
Armature displacement signal and electromagnetic force obtain required electric current, specific formula for calculation such as formula by calculating
FormulaIn, I is coil current A；δ is working gas gap length m；KfFor equivalent magnetic flux leakage coefficient, Kf=0.24~0.33 ×
10-3；F is electromagnetic force N；μ0For space permeability, value is 4 π × 10-7Wb/(A·m)；N is coil turn；S is magnetic circuit section
Product m2。
16. control method as claimed in claim 15, which is characterized in that in a preferred embodiment of the present invention, in formulaIn, the working gas gap length δ calculation formula such as formula
FormulaIn, x is armature displacement, m；δ0For initialization gas length, m；.
17. control method as claimed in claim 16, which is characterized in that in step 4, according to displacement computing module output
Armature displacement signal and electric current obtain required driving voltage, specific formula for calculation such as formula by calculating
FormulaIn, U is driving voltage V；I is coil current A；R is equivalent resistance Ω；L is coil equivalent inductance H；KdIt is
Raw back EMF coefficient Vs/m；X is that armature is displaced m.
18. control method as claimed in claim 17, which is characterized in that in formulaIn, the equivalent resistance R calculation formula
Such as formula
FormulaRaFor coil-winding resistance Ω；RbFor equivalent resistance Ω；.
19. control method as claimed in claim 18, which is characterized in that in formulaIn, the equivalent resistance R calculation formula
Such as formula
Formulaρ is winding wire resistivity Ω m；T is coil working temperature DEG C；LaFor winding wire length m；SaFor line
Enclose sectional area of wire m2；The dynamic raw back EMF coefficient KdLife is looked into according to the armature displacement signal of displacement computing module output
Back EMF coefficient arteries and veins is composed to obtain.
20. control method as claimed in claim 19, which is characterized in that in step 4, according to driving voltage divided by power supply electricity
Pressure drives duty cycle signals needed for obtaining；PWM switch duration arteries and veins is looked into according to the tach signal that speed probe is brought to compose
To switch duration signal.
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