CN107882644A - EGR rate control method, system and vehicle with low pressure EGR system - Google Patents
EGR rate control method, system and vehicle with low pressure EGR system Download PDFInfo
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- CN107882644A CN107882644A CN201610867208.2A CN201610867208A CN107882644A CN 107882644 A CN107882644 A CN 107882644A CN 201610867208 A CN201610867208 A CN 201610867208A CN 107882644 A CN107882644 A CN 107882644A
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- egr
- aperture
- rate
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- egr rate
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0052—Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
- F02D2021/083—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine controlling exhaust gas recirculation electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention provides a kind of EGR rate control method, system and vehicle with low pressure EGR system, this method includes：Target EGR rate is determined according to engine speed and expected moment of torsion；EGR valve aperture adjusted value is obtained according to the difference between current EGR rate and target EGR rate；EGR valve basis aperture is obtained according to EGR valve aperture adjusted value and EGR valve target aperture；Gas pedal aperture rate of change is obtained, and EGR valve aperture pre-control correction is determined according to gas pedal aperture rate of change and target EGR rate；EGR valve pre-control aperture is obtained according to EGR valve basis aperture and EGR valve aperture pre-control correction, so as to the aperture according to EGR valve pre-control aperture regulation EGR valve, so that current EGR rate reaches target EGR rate.The method of the present invention can make current EGR rate be rapidly achieved target EGR rate, and then can ensure in automobile transient operation, and target EGR rate is relatively more coincide with current EGR rate, effectively reduce and even avoid accelerating sluggish generation, lift the acceleration of vehicle.
Description
Technical field
The present invention relates to automobile technical field, more particularly to a kind of EGR rate control method with low pressure EGR system, it is
System and vehicle.
Background technology
Environmental problem, energy crisis, harsh discharge and the appearance of fuel economy regulation, sternness is proposed for internal combustion engine industry
Challenge.Drop oil consumption, settling-discharging are the targets that major automobile vendor strives realizing.
At present, the oil consumption of vehicle can be reduced by introducing turbocharger, but exhaust gas turbine additional issue motivation introduces
EGR, i.e.,：In automobile transient operation, (such as moment, which overtakes other vehicles, suddenly to be accelerated for exhaust gas recirculatioon (Exhaust Gas Recirculation)
Operating mode) when control for EGR rate the problem of certain be present, such as：Engine EGR system is to guide to the waste gas after catalyst converter
Before air-admission pressure-booster, it is necessary to by booster, air intake intercooler and air throttle can be just entered in engine cylinder.Such one
Come, pipeline is longer, at automobile transient operation (as anxious acceleration is overtaken other vehicles), it is difficult to ensure that the EGR rate entered in engine cylinder is just
It is the EGR rate of target, certain hysteresis quality is present, so as to influences vehicle discharge and vehicle accelerating ability energy.
The content of the invention
In view of this, the present invention is directed to propose a kind of EGR rate control method with low pressure EGR system, this method can be with
Current EGR rate is rapidly achieved target EGR rate, and then can ensure in automobile transient operation, target EGR rate and current EGR
Rate is relatively more coincide, and is effectively reduced and is even avoided accelerating sluggish generation, lifts the acceleration of vehicle.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of EGR rate control method with low pressure EGR system, the low pressure EGR system include the catalysis being sequentially connected in series
Device, cooler for recycled exhaust gas, EGR valve and EGR charge air coolers, the EGR charge air coolers are connected with the air inlet side of engine, the catalyst converter with
The exhaust side of booster is connected, and the described method comprises the following steps：Target EGR is determined according to engine speed and expected moment of torsion
Rate；EGR valve aperture adjusted value is obtained according to the difference between current EGR rate and the target EGR rate；Opened according to the EGR valve
Degree adjusted value and EGR valve target aperture obtain EGR valve basis aperture；Gas pedal aperture rate of change is obtained, and according to the oil
Door pedal aperture rate of change and the target EGR rate determine EGR valve aperture pre-control correction；Opened according to the EGR valve basis
Degree and the EGR valve aperture pre-control correction obtain EGR valve pre-control aperture, so as to according to the EGR valve pre-control aperture
The aperture of EGR valve is adjusted, so that current EGR rate reaches the target EGR rate.
Further, the difference between the current EGR rate of the basis and the target EGR rate obtains the adjustment of EGR valve aperture
Before value, in addition to：Total air inflow is determined according to intake air temperature and admission pressure；Fresh air is determined according to oil consumption and air-fuel ratio
Air inflow, and gas inlet amount is measured according to total air inflow and the FAI Fresh Air Intake；According to the gas inlet
Amount and total air inflow obtain the current EGR rate.
Further, it is described that EGR valve basis aperture is obtained according to the EGR valve aperture adjusted value and EGR valve target aperture
Before, in addition to：The EGR valve target aperture is obtained according to the engine speed and expected moment of torsion.
Further, the step of acquisition gas pedal aperture rate of change, including：Detect the throttle before and after the unit interval
Pedal aperture；The gas pedal aperture rate of change is determined according to the gas pedal aperture before and after the unit interval.
Further, the expected moment of torsion is to be determined according to current gas pedal aperture.
Relative to prior art, the EGR rate control method of the present invention with low pressure EGR system is with following excellent
Gesture：
The EGR rate control method with low pressure EGR system of the embodiment of the present invention, is solved in automobile transient operation (such as
Moment such as overtakes other vehicles at the anxious accelerating mode) when it is difficult to ensure that the problem of EGR rate entered in engine cylinder is target EGR rate, can be with
Anticipation for such as anxious accelerator, pre-control is carried out to EGR valve in advance, to ensure the EGR rate and target EGR rate that enter in cylinder
More closely, and then can ensure at automobile transient operation (such as moment overtake other vehicles anxious accelerating mode), target EGR rate with it is current
EGR rate is relatively more coincide, and is effectively reduced and is even avoided accelerating sluggish generation, lifts the response speed of vehicle, and then lifted
The acceleration of vehicle.
It is another object of the present invention to propose a kind of EGR rate control system with low pressure EGR system, the system can
So that current EGR rate is rapidly achieved target EGR rate, and then can ensure in automobile transient operation, target EGR rate with it is current
EGR rate is relatively more coincide, and is effectively reduced and is even avoided accelerating sluggish generation, lifts the acceleration of vehicle.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of EGR rate control system with low pressure EGR system, the low pressure EGR system include the catalysis being sequentially connected in series
Device, cooler for recycled exhaust gas, EGR valve and EGR charge air coolers, the EGR charge air coolers are connected with the air inlet side of engine, the catalyst converter with
The exhaust side of booster is connected, and the system includes：Target EGR rate determining module, for according to engine speed and expected torsion
Square determines target EGR rate；EGR valve aperture adjusted value determining module, for according between current EGR rate and the target EGR rate
Difference obtain EGR valve aperture adjusted value；EGR valve basis aperture determining module, for according to the EGR valve aperture adjusted value and
EGR valve target aperture obtains EGR valve basis aperture；EGR valve aperture pre-control correction determining module, for obtaining gas pedal
Aperture rate of change, and EGR valve aperture pre-control amendment is determined according to the gas pedal aperture rate of change and the target EGR rate
Amount；EGR valve pre-control aperture determining module, for according to EGR valve basis aperture and the EGR valve aperture pre-control amendment
EGR valve pre-control aperture is measured, so as to the aperture according to the EGR valve pre-control aperture regulation EGR valve, so that current EGR
Rate reaches the target EGR rate.
Further, the EGR valve aperture adjusted value determining module is additionally operable to according to intake air temperature and admission pressure determination
Total air inflow, and FAI Fresh Air Intake amount is determined according to oil consumption and air-fuel ratio, and according to total air inflow and the fresh sky
Gas air inflow obtains gas inlet amount, and obtains the current EGR rate according to the gas inlet amount and total air inflow.
Further, the EGR valve basis aperture determining module is additionally operable to according to the engine speed and expected moment of torsion
Obtain the EGR valve target aperture.
Further, the EGR valve aperture pre-control correction determining module is used to detect the throttle before and after the unit interval
Pedal aperture, and the gas pedal aperture rate of change is determined according to the gas pedal aperture before and after the unit interval.
The described EGR rate control system with low pressure EGR system and the above-mentioned EGR rate control with low pressure EGR system
Method processed is same relative to Dominant Facies possessed by prior art, will not be repeated here.
It is another object of the present invention to propose a kind of vehicle, the vehicle can make current EGR rate be rapidly achieved target
EGR rate, and then can ensure in automobile transient operation, target EGR rate is relatively more coincide with current EGR rate, is effectively reduced
Even avoid accelerating sluggish generation, lift the acceleration of vehicle.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of vehicle, it is provided with the EGR rate control system with low pressure EGR system as described in above-mentioned embodiment.
Described vehicle and the above-mentioned EGR rate control system with low pressure EGR system relative to prior art institute with
Dominant Facies it is same, will not be repeated here.
Brief description of the drawings
The accompanying drawing for forming the part of the present invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of the engine system described in the embodiment of the present invention；
Fig. 2 is the flow chart of the EGR rate control method with low pressure EGR system described in the embodiment of the present invention；
Fig. 3 is the stream of the EGR rate control method with low pressure EGR system described in one embodiment of the invention；
Fig. 4 is the structured flowchart of the EGR rate control system with low pressure EGR system described in the embodiment of the present invention.
Description of reference numerals：
EGR charge air coolers 1, lambda sensor 2, fuel injector 3, booster 4, catalyst converter 5, lambda sensor 6, air throttle 7, EGR valve
8th, cooler for recycled exhaust gas 9, EGR rate control system 400, target EGR rate determining module 410, EGR valve aperture with low pressure EGR system
Adjusted value determining module 420, EGR valve basis aperture determining module 430, EGR valve aperture pre-control correction determining module 440,
EGR valve pre-control aperture determining module 450.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 2 is the flow chart of the EGR rate control method according to an embodiment of the invention with low pressure EGR system.
Before the description EGR rate control method with low pressure EGR system according to embodiments of the present invention, first to starting
Machine system illustrates.
As shown in figure 1, engine system includes low pressure EGR system and other structures, low pressure EGR system includes being sequentially connected in series
Catalyst converter 5, cooler for recycled exhaust gas 9, EGR valve 8 and EGR charge air coolers 1, EGR charge air coolers 1 are connected with the air inlet side of engine, catalyst converter
5 are connected with the exhaust side of booster 4；It is, of course, also possible to including other structures, such as：Lambda sensor 2, fuel injector 3, the oxygen of booster 4
Sensor 6 and air throttle 7 etc..Wherein, low pressure EGR system by engine exhaust by taking gas after catalyst converter 5, by EGR valve 8 and
Be incorporated into after cooler for recycled exhaust gas 9 it is cold in air inlet before, by booster 4, entered after EGR charge air coolers 1 and air throttle 7 in cylinder.By
It is oversize in pipeline, therefore in transient operation (such as moment suddenly accelerates), it is difficult to ensure that being equal to this operating mode into the EGR rate in cylinder
Under target EGR rate.Therefore, embodiment of the invention discloses that one kind can be transient operation (such as moment suddenly accelerates)
In, it is ensured that it is equal to the EGR rate controlling party with low pressure EGR system of the target EGR rate under this operating mode into the EGR rate in cylinder
Method.
As shown in Fig. 2 and combine Fig. 3, the EGR rate control according to an embodiment of the invention with low pressure EGR system
Method, comprise the following steps：
S101：Target EGR rate is determined according to engine speed and expected moment of torsion.
Wherein, it is contemplated that moment of torsion is but is not limited to be determined according to current gas pedal aperture.Such as：According to gas pedal
Change current location, look into the tables of data demarcated in advance and obtain, because hysteresis quality be present in the response of engine system, therefore,
The actual torque of engine is also not reaching to this and is expected moment of torsion, and especially in transient operation, such as moment quickly overtakes other vehicles
When moment suddenly accelerates, moment of torsion is expected because the actual torque of engine can not quickly reach this, waits driver more bright
The hysteresis quality of the aobvious response for feeling engine system, influence vehicle and accelerate performance.
Include the diverse location of the change of gas pedal and pair of different expection moments of torsion in the tables of data demarcated in advance
It should be related to, can be obtained by Experimental Calibration.So that can be pre- accordingly to table look-up to obtain according to current gas pedal aperture
Phase moment of torsion.It is expected that moment of torsion refers to the current accessible moment of torsion of output torque for it is expected transmitter.
According to hair engine speed and expected moment of torsion, target EGR rate can be obtained by inquiring about EGR rate mapping table.EGR
The abscissa of data in rate mapping table is engine speed, and ordinate is moment of torsion, and content is EGR rate, in EGR rate mapping table
Data can obtain previously according to Experimental Calibration.So as to be mapped with inquiring about EGR rate according to engine speed and expected moment of torsion
Table, and then, easily determine corresponding target EGR rate.
S102：EGR valve aperture adjusted value is obtained according to the difference between current EGR rate and target EGR rate.Wherein, currently
Difference between EGR rate and target EGR rate subtracts target EGR rate for current EGR rate.
Current EGR rate be the currently practical waste gas into engine cylinder (i.e.：Gas inlet amount) shared enter engine
Total tolerance is (i.e.：Total air inflow) ratio.Specifically, obtained according to the difference between current EGR rate and the target EGR rate
Before EGR valve aperture adjusted value, in addition to：
1st, total air inflow is determined according to intake air temperature and admission pressure.
2nd, FAI Fresh Air Intake amount is determined according to oil consumption and air-fuel ratio, and measured according to total air inflow and FAI Fresh Air Intake
To gas inlet amount.
3rd, current EGR rate is obtained according to gas inlet amount and total air inflow.
I.e.：The specific total air into cylinder subtracts amount of fresh air (i.e.：FAI Fresh Air Intake amount), its difference is than upper
Total air inflow obtains current EGR rate.Total air inflow can be believed according to the output of intake air temperature sensor, air inlet pressure sensor
Number it is calculated, FAI Fresh Air Intake amount can be calculated according to current oil consumption and air-fuel ratio.
EGR valve aperture adjusted value is obtained according to the difference between current EGR rate and target EGR rate, including：Controlled using PID
Device processed, for target EGR rate, does closed loop PID regulations, the adjustment of output according to the difference between current EGR rate and target EGR rate
Be worth for EGR valve aperture value (i.e.：EGR valve aperture adjusted value).
S103：EGR valve basis aperture is obtained according to EGR valve aperture adjusted value and EGR valve target aperture.
Specifically, EGR valve target aperture adds EGR valve aperture adjusted value, obtains EGR valve basis aperture.Wherein, EGR valve
Target aperture is but is not limited to be obtained according to engine speed and expected moment of torsion, such as：EGR valve aperture mapping table is looked into obtain.EGR
The abscissa of aperture mapping table is engine speed, and ordinate is moment of torsion, and content is EGR valve aperture, in EGR aperture mapping tables
Data can demarcation obtains in advance according to experiment.It is thus possible to the mapping of EGR apertures is inquired about according to engine speed and expected moment of torsion
Table, and obtain corresponding EGR valve target aperture.
S104：Gas pedal aperture rate of change is obtained, and is determined according to gas pedal aperture rate of change and target EGR rate
EGR valve aperture pre-control correction.
In one embodiment of the invention, the step of obtaining gas pedal aperture rate of change, including：Detect the unit interval
Front and rear gas pedal aperture, and determine that the gas pedal aperture becomes according to the gas pedal aperture before and after the unit interval
Rate.Such as：Within the unit interval (such as 0.1S), the angle and direction, final output that are changed according to gas pedal are opening ratio
Time is (i.e.：Gas pedal aperture rate of change).
Determine that EGR valve aperture pre-control correction can be by looking into according to gas pedal aperture rate of change and target EGR rate
The mode of table obtains, such as：By gas pedal rate of change and target EGR rate, EGR valve aperture pre-control amendment mapping table is input to
In, obtain EGR valve aperture pre-control correction.Wherein, it is input to the horizontal seat of data in EGR valve aperture pre-control amendment mapping table
Gas pedal aperture rate of change is designated as, ordinate is target EGR rate, and content is EGR valve aperture pre-control correction, and EGR valve is opened
Data in degree pre-control amendment mapping table can be obtained by testing demarcation in advance.
S105：EGR valve pre-control aperture is obtained according to EGR valve basis aperture and EGR valve aperture pre-control correction, so as to
According to the aperture of EGR valve pre-control aperture regulation EGR valve, so that current EGR rate reaches target EGR rate.
Wherein, EGR valve aperture pre-control correction is added according to EGR valve basis aperture, obtains final EGR valve pre-control aperture
(i.e.：EGR valve pre-control aperture).
EGR rate control method with low pressure EGR system according to embodiments of the present invention, is solved in automobile transient operation
, can it is difficult to ensure that the problem of EGR rate entered in engine cylinder is target EGR rate when (such as moment overtake other vehicles anxious accelerating mode)
With the anticipation for such as anxious accelerator, pre-control is carried out to EGR valve in advance, to ensure the EGR rate and the target EGR that enter in cylinder
Rate is more closely, and then can ensure that target EGR rate is with working as at automobile transient operation (such as moment overtake other vehicles anxious accelerating mode)
Preceding EGR rate is relatively more coincide, and is effectively reduced and is even avoided accelerating sluggish generation, lifts the response speed of vehicle, Jin Erti
Rise the acceleration of vehicle.
Fig. 4 is the structured flowchart of the EGR rate control system according to an embodiment of the invention with low pressure EGR system.
As shown in figure 4, the EGR rate control system 400 according to an embodiment of the invention with low pressure EGR system, including：Target
EGR rate determining module 410, EGR valve aperture adjusted value determining module 420, EGR valve basis aperture determining module 430, EGR valve are opened
Spend pre-control correction determining module 440 and EGR valve pre-control aperture determining module 450.
Wherein, target EGR rate determining module 410 is used to determine target EGR rate according to engine speed and expected moment of torsion.
EGR valve aperture adjusted value determining module 420 is used to obtain EGR valve according to the difference between current EGR rate and the target EGR rate
Aperture adjusted value.EGR valve basis aperture determining module 430 is used for according to the EGR valve aperture adjusted value and EGR valve target aperture
Obtain EGR valve basis aperture.EGR valve aperture pre-control correction determining module 440 is used to obtain gas pedal aperture rate of change,
And EGR valve aperture pre-control correction is determined according to the gas pedal aperture rate of change and the target EGR rate.EGR valve is pre-
Control aperture determining module 450 is used to be obtained according to EGR valve basis aperture and the EGR valve aperture pre-control correction
EGR valve pre-control aperture, so as to the aperture according to the EGR valve pre-control aperture regulation EGR valve, so that current EGR rate reaches
The target EGR rate.
In one embodiment of the invention, EGR valve aperture adjusted value determining module 420 be additionally operable to according to intake air temperature and
Admission pressure determines total air inflow, and determines FAI Fresh Air Intake amount according to oil consumption and air-fuel ratio, and according to total air inflow
Gas inlet amount is measured with the FAI Fresh Air Intake, and institute is obtained according to the gas inlet amount and total air inflow
State current EGR rate.
In one embodiment of the invention, EGR valve basis aperture determining module 430 is additionally operable to be turned according to the engine
Speed and expected moment of torsion obtain the EGR valve target aperture.
In one embodiment of the invention, when EGR valve aperture pre-control correction determining module 440 is used to detect unit
Between front and rear gas pedal aperture, and the gas pedal aperture is determined according to the gas pedal aperture before and after the unit interval
Rate of change.
EGR rate control system with low pressure EGR system according to embodiments of the present invention, is solved in automobile transient operation
, can it is difficult to ensure that the problem of EGR rate entered in engine cylinder is target EGR rate when (such as moment overtake other vehicles anxious accelerating mode)
With the anticipation for such as anxious accelerator, pre-control is carried out to EGR valve in advance, to ensure the EGR rate and the target EGR that enter in cylinder
Rate is more closely, and then can ensure that target EGR rate is with working as at automobile transient operation (such as moment overtake other vehicles anxious accelerating mode)
Preceding EGR rate is relatively more coincide, and is effectively reduced and is even avoided accelerating sluggish generation, lifts the response speed of vehicle, Jin Erti
Rise the acceleration of vehicle.
It should be noted that the specific implementation side of the EGR rate control system with low pressure EGR system of the embodiment of the present invention
Formula is similar with the specific implementation of the EGR rate control method with low pressure EGR system of the above embodiments of the present invention, specifically
The description of method part is referred to, in order to reduce redundancy, is not repeated herein.
Further, embodiment of the invention discloses that a kind of vehicle, is provided with any one embodiment as described above
EGR rate control system with low pressure EGR system.The vehicle solves that (such as moment overtakes other vehicles anxious accelerate in automobile transient operation
Operating mode) when it is difficult to ensure that the problem of EGR rate entered in engine cylinder is target EGR rate, can be for such as anxious accelerator
Anticipation, pre-control is carried out to EGR valve in advance, with the EGR rate and the target EGR rate that ensure to enter in cylinder more closely, and then can
To ensure that at automobile transient operation (such as moment overtake other vehicles anxious accelerating mode), target EGR rate is relatively more kissed with current EGR rate
Close, effectively reduce and even avoid accelerating sluggish generation, lift the response speed of vehicle, and then lift the acceleration of vehicle.
In addition, other compositions of vehicle according to embodiments of the present invention and effect are for one of ordinary skill in the art
For be all known, in order to reduce redundancy, do not repeat herein.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (10)
1. a kind of EGR rate control method with low pressure EGR system, it is characterised in that the low pressure EGR system includes going here and there successively
Catalyst converter, cooler for recycled exhaust gas, EGR valve and the EGR charge air coolers of connection, the EGR charge air coolers are connected with the air inlet side of engine, described
Catalyst converter is connected with the exhaust side of booster, the described method comprises the following steps：
Target EGR rate is determined according to engine speed and expected moment of torsion；
EGR valve aperture adjusted value is obtained according to the difference between current EGR rate and the target EGR rate；
EGR valve basis aperture is obtained according to the EGR valve aperture adjusted value and EGR valve target aperture；
Gas pedal aperture rate of change is obtained, and EGR is determined according to the gas pedal aperture rate of change and the target EGR rate
Valve opening pre-control correction；
EGR valve pre-control aperture is obtained according to EGR valve basis aperture and the EGR valve aperture pre-control correction, so as to
According to the aperture of the EGR valve pre-control aperture regulation EGR valve, so that current EGR rate reaches the target EGR rate.
2. the EGR rate control method according to claim 1 with low pressure EGR system, it is characterised in that the basis is worked as
Before difference between preceding EGR rate and the target EGR rate obtains EGR valve aperture adjusted value, in addition to：
Total air inflow is determined according to intake air temperature and admission pressure；
FAI Fresh Air Intake amount is determined according to oil consumption and air-fuel ratio, and according to total air inflow and the FAI Fresh Air Intake amount
Obtain gas inlet amount；
The current EGR rate is obtained according to the gas inlet amount and total air inflow.
3. the EGR rate control method according to claim 1 with low pressure EGR system, it is characterised in that described according to institute
State EGR valve aperture adjusted value and before EGR valve target aperture obtains EGR valve basis aperture, in addition to：
The EGR valve target aperture is obtained according to the engine speed and expected moment of torsion.
4. the EGR rate control method according to claim 1 with low pressure EGR system, it is characterised in that described to obtain oil
The step of door pedal aperture rate of change, including：
Detect the gas pedal aperture before and after the unit interval；
The gas pedal aperture rate of change is determined according to the gas pedal aperture before and after the unit interval.
5. the EGR rate control method with low pressure EGR system according to claim any one of 1-4, it is characterised in that institute
It is to be determined according to current gas pedal aperture to state expected moment of torsion.
6. a kind of EGR rate control system with low pressure EGR system, it is characterised in that the low pressure EGR system includes going here and there successively
Catalyst converter, cooler for recycled exhaust gas, EGR valve and the EGR charge air coolers of connection, the EGR charge air coolers are connected with the air inlet side of engine, described
Catalyst converter is connected with the exhaust side of booster, and the system includes：
Target EGR rate determining module, for determining target EGR rate according to engine speed and expected moment of torsion；
EGR valve aperture adjusted value determining module, for obtaining EGR according to the difference between current EGR rate and the target EGR rate
Valve opening adjusted value；
EGR valve basis aperture determining module, for obtaining EGR valve according to the EGR valve aperture adjusted value and EGR valve target aperture
Basic aperture；
EGR valve aperture pre-control correction determining module, is stepped on for obtaining gas pedal aperture rate of change, and according to the throttle
Plate aperture rate of change and the target EGR rate determine EGR valve aperture pre-control correction；
EGR valve pre-control aperture determining module, for being repaiied according to EGR valve basis aperture and the EGR valve aperture pre-control
Positive quantity obtains EGR valve pre-control aperture, so as to the aperture according to the EGR valve pre-control aperture regulation EGR valve, so that currently
EGR rate reaches the target EGR rate.
7. the EGR rate control system according to claim 6 with low pressure EGR system, it is characterised in that the EGR valve
Aperture adjusted value determining module is additionally operable to determine total air inflow according to intake air temperature and admission pressure, and according to oil consumption and air-fuel ratio
FAI Fresh Air Intake amount is determined, and gas inlet amount is measured according to total air inflow and the FAI Fresh Air Intake, and
The current EGR rate is obtained according to the gas inlet amount and total air inflow.
8. the EGR rate control system according to claim 6 with low pressure EGR system, it is characterised in that the EGR valve
Basic aperture determining module is additionally operable to obtain the EGR valve target aperture according to the engine speed and expected moment of torsion.
9. the EGR rate control system with low pressure EGR system according to claim any one of 6-8, it is characterised in that institute
EGR valve aperture pre-control correction determining module is stated to be used to detect the gas pedal aperture before and after the unit interval, and according to described
Gas pedal aperture before and after unit interval determines the gas pedal aperture rate of change.
10. a kind of vehicle, it is characterised in that set has low pressure EGR system just like described in claim any one of 6-9
EGR rate control system.
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| CN201610867208.2A CN107882644A (en) | 2016-09-30 | 2016-09-30 | EGR rate control method, system and vehicle with low pressure EGR system |
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| CN201610867208.2A CN107882644A (en) | 2016-09-30 | 2016-09-30 | EGR rate control method, system and vehicle with low pressure EGR system |
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| CN110714862A (en) * | 2019-10-21 | 2020-01-21 | 上海理工大学 | Control method for realizing pre-control exhaust gas recirculation system |
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