CN109209688A - Exhaust gas flow measuring system, measurement method and closed loop control method - Google Patents
Exhaust gas flow measuring system, measurement method and closed loop control method Download PDFInfo
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- CN109209688A CN109209688A CN201811082205.3A CN201811082205A CN109209688A CN 109209688 A CN109209688 A CN 109209688A CN 201811082205 A CN201811082205 A CN 201811082205A CN 109209688 A CN109209688 A CN 109209688A
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- exhaust gas
- valve
- egr valve
- under different
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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
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
-
- 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]
-
- 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
Abstract
The present invention provides a kind of exhaust gas flow measuring system, measurement method and closed loop control method, which increases temperature sensor, first pressure sensor and second pressure sensor on the basis of EGR exhaust recirculating system and engine controller.Theoretical exhaust gas flow of the correlation data calculation EGR valve that engine controller is fed back based on temperature sensor, first pressure sensor and second pressure sensor under different opening, and then discharge coefficient of the available EGR valve of EGR valve discharge characteristic under different opening is applied, and practical exhaust gas flow of the EGR valve under different opening is obtained with discharge coefficient revised theory exhaust gas flow.Based on system disclosed in this invention, without the components such as Venturi meter can flow rate calculation, thus avoid Venturi meter design it is unreasonable caused by exhaust gas flow calculate inaccurate problem.
Description
Technical field
The present invention relates to technical field of engines, more specifically to a kind of exhaust gas flow measuring system, measurement method
And closed loop control method.
Background technique
With increasingly strict, EGR (Exhaust Gas Recirculation, exhaust gas recycling) technology of emission regulation
It is had been widely used as the major measure for reducing NOx.
At this stage, the components such as Venturi meter are needed to carry out flow rate calculation based on EGR exhaust flow closed loop strategy.But
It is, since Venturi meter design requirement is very high, once the unreasonable exhaust gas flow that will lead to of design calculates inaccurate, to influence to arrange
It puts.
Summary of the invention
In view of this, to solve the above problems, the present invention provides a kind of exhaust gas flow measuring system, measurement method and closed loop
Control method, technical solution are as follows:
A kind of exhaust gas flow measuring system, including EGR exhaust recirculating system and engine controller, the egr system
Including cooler for recycled exhaust gas and EGR valve, the system also includes: with the temperature sensor of engine controller communication connection, the
One pressure sensor and second pressure sensor；
The temperature sensor, the first pressure sensor are set to the air inlet of the cooler for recycled exhaust gas and the EGR valve
Between mouthful, the second pressure sensor is set to the gas outlet of the EGR valve；
The temperature sensor, for measuring EGR valve exhaust gas temperature before the valve under different opening, before the valve
Exhaust gas temperature is simultaneously sent to the engine controller；
The first pressure sensor, for measuring EGR valve exhaust gas pressure before the valve under different opening, and by institute
Exhaust gas pressure is sent to the engine controller before stating valve；
The second pressure sensor, for measuring EGR valve exhaust gas pressure after the valve under different opening, and by institute
Exhaust gas pressure is sent to the engine controller after stating valve；
The engine controller, for according to exhaust gas pressure calculating after exhaust gas pressure before the valve and the valve
EGR valve pressure difference before and after the valve under different opening；Using giving up before pressure difference before and after exhaust gas pressure before the valve, the valve and the valve
Theoretical exhaust gas flow of the EGR valve described in gas temperature computation under different opening；Obtain flow of the EGR valve under different opening
Coefficient, and using the discharge coefficient correct the theoretical exhaust gas flow to obtain reality of the EGR valve under different opening useless
Throughput.
Preferably, for being calculated using exhaust gas temperature before pressure difference before and after exhaust gas pressure, the valve before the valve and the valve
The engine controller of theoretical exhaust gas flow of the EGR valve under different opening, is specifically used for:
Theoretical exhaust gas flow of the EGR valve under different opening, the Bernoulli equation are calculated according to Bernoulli equation
Are as follows:
Wherein, Q' is theoretical exhaust gas flow of the EGR valve under different opening, and A is the default circulating face of the EGR valve
Product, Δ P are pressure difference before and after the valve, ρ be exhaust gas density andPinFor exhaust gas pressure before the valve, TinFor institute
Exhaust gas temperature before valve is stated, R is thermodynamic gas constant.
Preferably, the engine controller, is also used to:
Establish before and after the valve of the EGR valve under different opening exhaust gas temperature and the reality before pressure difference, the valve
Corresponding relationship between exhaust gas flow, and exhaust gas flow MAP chart is generated using the corresponding relationship.
A kind of exhaust gas flow measurement method, which is characterized in that be applied to waste gas stream described in above-mentioned technical proposal any one
Engine controller in system for measuring quantity, which comprises
The EGR valve that the temperature sensor the is sent exhaust gas temperature, described before the valve under different opening is received respectively
The EGR valve that first pressure sensor is sent exhaust gas pressure, second pressure sensor hair before the valve under different opening
The EGR valve sent exhaust gas pressure after the valve under different opening；
The EGR valve is calculated before the valve under different opening according to exhaust gas pressure after exhaust gas pressure before the valve and the valve
Pressure difference afterwards；
The EGR valve is calculated using exhaust gas temperature before pressure difference before and after exhaust gas pressure, the valve before the valve and the valve to exist
Theoretical exhaust gas flow under different opening；
Discharge coefficient of the EGR valve under different opening is obtained, and corrects the theory using the discharge coefficient and gives up
Throughput obtains practical exhaust gas flow of the EGR valve under different opening.
Preferably, described to be calculated using exhaust gas temperature before pressure difference before and after exhaust gas pressure, the valve before the valve and the valve
Theoretical exhaust gas flow of the EGR valve under different opening, comprising:
Theoretical exhaust gas flow of the EGR valve under different opening, the Bernoulli equation are calculated according to Bernoulli equation
Are as follows:
Wherein, Q' is theoretical exhaust gas flow of the EGR valve under different opening, and A is the default circulating face of the EGR valve
Product, Δ P are pressure difference before and after the valve, ρ be exhaust gas density andPinFor exhaust gas pressure before the valve, TinFor institute
Exhaust gas temperature before valve is stated, R is thermodynamic gas constant.
Preferably, the method also includes:
Establish before and after the valve of the EGR valve under different opening exhaust gas temperature and the reality before pressure difference, the valve
Corresponding relationship between exhaust gas flow, and exhaust gas flow MAP chart is generated using the corresponding relationship.
A kind of closed loop control method, which is characterized in that be applied to waste gas stream described in above-mentioned technical proposal any one and measure
Engine controller in amount system, which comprises
The EGR valve that the temperature sensor is sent exhaust gas temperature value, institute before the valve under current aperture are received respectively
State first pressure sensor transmission the EGR valve before the valve under current aperture exhaust gas pressure value, the second pressure sensing
The EGR valve that device is sent exhaust gas pressure value after the valve under current aperture；
It determines and is given up after exhaust gas pressure value and the valve before the valve under the current aperture before exhaust gas temperature value, the valve
Practical waste gas stream magnitude corresponding to air pressure force value；
It determines exhaust gas flow target value corresponding to the target EGR rate of engine operating condition, and calculates the exhaust gas flow mesh
The deviation of scale value and the practical waste gas stream magnitude；
Judge the deviation whether in predetermined deviation allowed band；
If it is not, then determining the corresponding adjusting opening value of the practical waste gas stream magnitude deviation using pid algorithm；
The target aperture of the EGR valve is calculated using the default feedforward opening value of the adjusting opening value and the EGR valve
Value；
The EGR valve is controlled according to the target opening value, and returns to execute and described receives the temperature sensor respectively
The EGR valve sent the EGR valve that exhaust gas temperature value, the first pressure sensor are sent before the valve under current aperture
The EGR valve that exhaust gas pressure value, the second pressure sensor are sent before the valve under current aperture is under current aperture
Exhaust gas pressure value after valve, the step for.
Compared to the prior art, what the present invention realized has the beneficial effect that
The above present invention provides a kind of exhaust gas flow measuring system, measurement method and closed loop control method, and the system is in EGR
Temperature sensor, first pressure sensor and second pressure are increased on the basis of gas recirculation system and engine controller
Sensor.Engine controller is fed back related based on temperature sensor, first pressure sensor and second pressure sensor
Data calculate theoretical exhaust gas flow of the EGR valve under different opening, and then exist using the available EGR valve of EGR valve discharge characteristic
Discharge coefficient under different opening, and reality of the EGR valve under different opening is obtained with discharge coefficient revised theory exhaust gas flow
Exhaust gas flow.Based on system disclosed in this invention, without the components such as Venturi meter can flow rate calculation, to avoid text
The unreasonable caused exhaust gas flow of flowmeter design calculates inaccurate problem in mound.
Furthermore, on the one hand, system disclosed in this invention saves the components such as Venturi meter, arranges simpler.It is another
Aspect will increase the pressure loss in egr system pipeline since the components such as Venturi meter belong to throttling set, application
System disclosed in this invention can reduce the egr system pressure loss, conducive to the raising of EGR rate.
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
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structural schematic diagram of egr system；
Fig. 2 is the structural schematic diagram of exhaust gas flow measuring system provided in an embodiment of the present invention；
Fig. 3 is the example of the rating curve of EGR valve；
Fig. 4 is the example of three-dimensional exhaust gas flow MAP chart；
Fig. 5 is the method flow diagram of exhaust gas flow measurement method provided in an embodiment of the present invention；
Fig. 6 is the another method flow chart of exhaust gas flow measurement method provided in an embodiment of the present invention；
Fig. 7 is the method flow diagram of closed loop control method provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
EGR:Exhaust Gas Recirculation, exhaust gas recycling, by engine be discharged exhaust gas be reintroduced back into
Enter combustion chamber after tracheae and live gas mixing to burn, this measure can effectively reduce engine NOx emission.
EGR valve: exhaust gas flow is controlled by different opening.
EGR valve discharge characteristic: when constant by EGR valve pressure drop, as EGR valve valve block runs to volume from closed position
Determine the relationship during stroke between discharge coefficient and valve block stroke.
Fig. 1 is the structural schematic diagram of egr system, and egr system includes air cleaner 1, press machine 2, intercooler in Fig. 1
3, throttle valve 4, EGR valve 5, cooler for recycled exhaust gas 6, engine 7, turbine 8, DOC (Diesel Oxidation Catalyst, bavin
Oil machine oxidation catalyzer) 9, DPF (Diesel Particle Filter, diesel particulate filter) 10 and SCR
(Selective Catalytic Reduction, selective catalytic reduction) 11.
On the basis of egr system out shown in Fig. 1, the present invention provides a kind of exhaust gas flow measuring system, the exhaust gas flow
The structural schematic diagram of measuring system is as shown in Fig. 2, include egr system and engine controller (being not shown in Fig. 2), egr system
Including cooler for recycled exhaust gas 6 and EGR valve 5, the exhaust gas flow measuring system further include: the temperature with engine controller communication connection
Sensor 12, first pressure sensor 13 and second pressure sensor 14.
Temperature sensor 12, first pressure sensor 13 are set between cooler for recycled exhaust gas 6 and the air inlet of EGR valve 5, the
Two pressure sensors 14 are set to the gas outlet of EGR valve 5.
Temperature sensor 12, for measuring the exhaust gas temperature before the valve under different opening of EGR valve 5, by exhaust gas temperature before valve
And it is sent to engine controller.
First pressure sensor 13 for measuring the exhaust gas pressure before the valve under different opening of EGR valve 5, and will give up before valve
Atmospheric pressure is sent to engine controller.
Second pressure sensor 14 for measuring the exhaust gas pressure after the valve under different opening of EGR valve 5, and will give up after valve
Atmospheric pressure is sent to engine controller.
It should be noted that temperature sensor, first pressure sensor and second pressure sensor same time were directed to
It is same EGR valve aperture.
Engine controller, for calculating EGR valve 5 under different opening according to exhaust gas pressure after exhaust gas pressure before valve and valve
Valve before and after pressure difference；EGR valve 5 is calculated under different opening using exhaust gas temperature before pressure difference before and after exhaust gas pressure, valve before valve and valve
Theoretical exhaust gas flow；Discharge coefficient of the EGR valve 5 under different opening is obtained, and utilizes discharge coefficient revised theory waste gas stream
Measure practical exhaust gas flow of the EGR valve 5 under different opening.
In the present embodiment, the pressure difference before and after the valve under different opening of EGR valve 5 can be calculated according to following formula (1):
Δ P=Pin-Pout (1)
Wherein, Δ P is pressure difference before and after valve, PinFor exhaust gas pressure before valve, PoutFor exhaust gas pressure after valve.
Further, theoretical exhaust gas flow of the EGR valve 5 under different opening, Bernoulli Jacob side can be calculated according to Bernoulli equation
Journey are as follows:
Wherein, Q' theory exhaust gas flow, A are the default circulation area of EGR valve 5, are obtained according to aperture theoretical calculation, are several
What define, Δ P be valve before and after pressure difference, ρ be exhaust gas density andTinFor exhaust gas temperature before valve, R is thermodynamics gas
Body constant.
Further, engine, can be based on pre- during obtaining discharge coefficient of the EGR valve 5 under different opening
The corresponding relationship of the EGR valve aperture and discharge coefficient that are first arranged determines.And discharge coefficient then can by it is offline (outside engine,
On normal flow testing stand) calibration, the practical exhaust gas flow of EGR valve and proving flowmeter institute measurement of discharge specifically may be used to mark
Using by the ratio of proving flowmeter institute's measurement of discharge and the practical exhaust gas flow of EGR valve as discharge coefficient.
Also, the form of expression of above-mentioned corresponding relationship can be MAP chart, MAP table, can also be rating curve.With
For rating curve shown in Fig. 3, the X-axis of the rating curve indicates that EGR valve aperture, Y-axis indicate discharge coefficient,
In the case that EGR valve aperture determines, the corresponding discharge coefficient of EGR valve aperture can be determined on rating curve.
Finally, practical exhaust gas flow of the EGR valve 5 under different opening can be calculated according to following formula (3):
Q=Q'* δ (3)
Wherein, Q is practical exhaust gas flow, and δ is discharge coefficient.
In some other embodiment, to improve the convenience for searching practical exhaust gas flow, also used in engine controller
In:
Establish pair of the EGR valve before pressure difference, valve before and after the valve under different opening between exhaust gas temperature and practical exhaust gas flow
It should be related to, and generate exhaust gas flow MAP chart using corresponding relationship.
Fig. 4 shows the three-dimensional exhaust gas flow MAP chart of exhaust gas temperature fixation before a valve, X-axis in the three-dimensional exhaust gas flow MAP chart
Indicate that EGR valve aperture, Y-axis indicate that valve front and back pressure difference, Z axis indicate practical exhaust gas flow.Certainly, as long as before and after EGR valve aperture, valve
There is a parameter to fix in exhaust gas temperature before pressure difference, valve, produces different three-dimensional exhaust gas flows based on other 3 parameters
MAP chart.The present embodiment repeats no more this.
Exhaust gas flow measuring system provided in an embodiment of the present invention, in system engine controller be based on temperature sensor,
Theoretical exhaust gas of the correlation data calculation EGR valve that first pressure sensor and second pressure sensor are fed back under different opening
Flow, and then discharge coefficient of the application available EGR valve of EGR valve discharge characteristic under different opening, and repaired with discharge coefficient
Positive theory exhaust gas flow obtains practical exhaust gas flow of the EGR valve under different opening.Based on system disclosed in this invention, it is not necessarily to
The components such as Venturi meter can flow rate calculation, thus avoid Venturi meter design it is unreasonable caused by exhaust gas flow
Calculate inaccurate problem.
The exhaust gas flow measuring system provided based on the above embodiment, then correspondence provides a kind of waste gas stream to the embodiment of the present invention
Measuring method, this method be applied to exhaust gas flow measuring system in engine controller, method flow diagram as shown in figure 5,
Include the following steps:
S10, the EGR valve that reception temperature sensor is sent respectively exhaust gas temperature, first pressure before the valve under different opening
The EGR valve that sensor the is sent EGR valve that exhaust gas pressure, second pressure sensor are sent before the valve under different opening is opened in difference
Exhaust gas pressure after valve under degree.
It should be noted that temperature sensor, first pressure sensor and second pressure sensor same time were directed to
It is same EGR valve aperture.
S20 calculates EGR valve pressure difference before and after the valve under different opening according to exhaust gas pressure after exhaust gas pressure before valve and valve.
In the present embodiment, EGR valve pressure difference before and after the valve under different opening can be calculated according to above-mentioned formula (1).
S30 calculates EGR valve under different opening using exhaust gas temperature before pressure difference before and after exhaust gas pressure, valve before valve and valve
Theoretical exhaust gas flow.
In the present embodiment, theoretical exhaust gas flow of the EGR valve under different opening, Bernoulli Jacob can be calculated according to Bernoulli equation
Shown in equation such as above-mentioned formula (2).
S40 is obtained discharge coefficient of the EGR valve under different opening, and is obtained using discharge coefficient revised theory exhaust gas flow
To practical exhaust gas flow of the EGR valve under different opening.
In the present embodiment, engine can be based on during obtaining discharge coefficient of the EGR valve 5 under different opening
The corresponding relationship of pre-set EGR valve aperture and discharge coefficient determines.And discharge coefficient can then pass through offline (engine
Outside, on normal flow testing stand) calibration, the practical exhaust gas flow of EGR valve and proving flowmeter institute measurement of discharge are carried out to mark, specifically
It can be using the ratio of proving flowmeter institute's measurement of discharge and the practical exhaust gas flow of EGR valve as discharge coefficient.
Also, the form of expression of above-mentioned corresponding relationship can be MAP chart, MAP table, can also be rating curve.With
For rating curve shown in Fig. 3, the X-axis of the rating curve indicates that EGR valve aperture, Y-axis indicate discharge coefficient,
In the case that EGR valve aperture determines, the corresponding discharge coefficient of EGR valve aperture can be determined on rating curve.
In addition, practical exhaust gas flow of the EGR valve 5 under different opening can be calculated according to above-mentioned formula (3).
In some other embodiment, to improve the convenience for searching practical exhaust gas flow, in the exhaust gas flow shown in Fig. 5
Further include following steps on the basis of measurement method, method flow diagram is as shown in Figure 6:
S50 establishes EGR valve before pressure difference, valve before and after the valve under different opening between exhaust gas temperature and practical exhaust gas flow
Corresponding relationship, and using corresponding relationship generate exhaust gas flow MAP chart.
Fig. 4 shows the three-dimensional exhaust gas flow MAP chart of exhaust gas temperature fixation before a valve, X-axis in the three-dimensional exhaust gas flow MAP chart
Indicate that EGR valve aperture, Y-axis indicate that valve front and back pressure difference, Z axis indicate practical exhaust gas flow.Certainly, as long as before and after EGR valve aperture, valve
There is a parameter to fix in exhaust gas temperature before pressure difference, valve, produces different three-dimensional exhaust gas flows based on other 3 parameters
MAP chart.The present embodiment repeats no more this.
It should also be noted that, engine controller can also establish EGR valve and open in difference in some other embodiment
Corresponding relationship before and after valve under degree before pressure difference, valve between exhaust gas temperature and theoretical exhaust gas flow, and generated using corresponding relationship
Corresponding exhaust gas flow MAP chart.
Exhaust gas flow measurement method provided in an embodiment of the present invention, engine controller are based on temperature sensor, the first pressure
Theoretical exhaust gas flow of the correlation data calculation EGR valve that force snesor and second pressure sensor are fed back under different opening,
And then discharge coefficient of the available EGR valve of EGR valve discharge characteristic under different opening is applied, and with discharge coefficient revised theory
Exhaust gas flow obtains practical exhaust gas flow of the EGR valve under different opening.Based on method of the invention, it is not necessarily to Venturi meter
Equal components can flow rate calculation, thus avoid Venturi meter design it is unreasonable caused by exhaust gas flow calculate inaccurate ask
Topic.
The exhaust gas flow measuring system provided based on the above embodiment, then correspondence provides a kind of closed loop control to the embodiment of the present invention
Method processed, this method be applied to exhaust gas flow measuring system in engine controller, method flow diagram as shown in fig. 7, comprises
Following steps:
S60, the EGR valve that reception temperature sensor is sent respectively exhaust gas temperature value, the first pressure before the valve under current aperture
The EGR valve that force snesor the is sent EGR valve that exhaust gas pressure value, second pressure sensor are sent before the valve under current aperture is being worked as
Exhaust gas pressure value after valve under preceding aperture.
S70 determines before the valve under current aperture that exhaust gas pressure value institute is right after exhaust gas pressure value and valve before exhaust gas temperature value, valve
The practical waste gas stream magnitude answered.
In the present embodiment, engine controller has precalculated to obtain practical exhaust gas flow of the EGR valve under different opening,
Therefore corresponding reality can determine based on exhaust gas pressure value after exhaust gas pressure value, valve before exhaust gas temperature value, valve before current aperture, valve
Border waste gas stream magnitude.
S80 determines exhaust gas flow target value corresponding to the target EGR rate of engine operating condition, and calculates exhaust gas flow mesh
The deviation of scale value and practical waste gas stream magnitude.
It, can be using exhaust gas flow target value and the difference of practical waste gas stream magnitude as deviation in the present embodiment.
S90, whether judgment bias value is in predetermined deviation allowed band；If it is not, thening follow the steps S60.
In the present embodiment, if the termination condition of closed-loop control is that practical waste gas stream magnitude is equal with exhaust gas flow target value
Or it is of substantially equal.For example, when predetermined deviation allowed band is -10kg/h~-10kg/h, if deviation is 5kg/h,
Indicate that practical waste gas stream magnitude and exhaust gas flow are of substantially equal.
S100 determines the corresponding adjusting opening value of practical waste gas stream magnitude deviation using pid algorithm.
S110 calculates the target opening value of EGR valve using the default feedforward opening value for adjusting opening value and EGR valve.
In the present embodiment, the sum of opening value and default feedforward opening value will be adjusted and be used as target opening value.
S120 controls EGR valve according to target opening value, and returns to step S60.
In addition, if deviation in predetermined deviation allowed band, then generates the prompt for characterizing closed-loop control completion
Information.
Closed loop control method provided in an embodiment of the present invention, can be based on EGR valve discharge characteristic to working conditions of different engines
Under EGR valve aperture controlled, improve the accuracy of closed-loop control.
Exhaust gas flow measuring system, measurement method and closed loop control method provided by the present invention have been carried out in detail above
It introduces, used herein a specific example illustrates the principle and implementation of the invention, the explanation of above embodiments
It is merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to this
The thought of invention, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification is not answered
It is interpreted as limitation of the present invention.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For the device disclosed in the embodiment, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, phase
Place is closed referring to method part illustration.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the element that the process, method, article or equipment including a series of elements is intrinsic,
It further include either the element intrinsic for these process, method, article or equipments.In the absence of more restrictions,
The element limited by sentence "including a ...", it is not excluded that in the process, method, article or equipment including the element
In there is also other identical elements.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of exhaust gas flow measuring system, including EGR exhaust recirculating system and engine controller, the egr system packet
Include cooler for recycled exhaust gas and EGR valve, which is characterized in that the system also includes: the temperature with engine controller communication connection
Sensor, first pressure sensor and second pressure sensor；
The temperature sensor, the first pressure sensor be set to the cooler for recycled exhaust gas and the EGR valve air inlet it
Between, the second pressure sensor is set to the gas outlet of the EGR valve；
The temperature sensor, for measuring EGR valve exhaust gas temperature before the valve under different opening, by exhaust gas before the valve
Temperature is simultaneously sent to the engine controller；
The first pressure sensor, for measuring EGR valve exhaust gas pressure before the valve under different opening, and by the valve
Preceding exhaust gas pressure is sent to the engine controller；
The second pressure sensor, for measuring EGR valve exhaust gas pressure after the valve under different opening, and by the valve
Exhaust gas pressure is sent to the engine controller afterwards；
The engine controller, for calculating the EGR valve according to exhaust gas pressure after exhaust gas pressure before the valve and the valve
The pressure difference before and after the valve under different opening；Utilize exhaust gas temperature before pressure difference before and after exhaust gas pressure, the valve before the valve and the valve
Degree calculates theoretical exhaust gas flow of the EGR valve under different opening；Obtain flow system of the EGR valve under different opening
Number, and correct the theoretical exhaust gas flow using the discharge coefficient and obtain practical exhaust gas of the EGR valve under different opening
Flow.
2. system according to claim 1, which is characterized in that before and after using exhaust gas pressure, the valve before the valve
Exhaust gas temperature calculates the engine control of theoretical exhaust gas flow of the EGR valve under different opening before pressure difference and the valve
Device is specifically used for:
Theoretical exhaust gas flow of the EGR valve under different opening, the Bernoulli equation are calculated according to Bernoulli equation are as follows:
Wherein, Q' is theoretical exhaust gas flow of the EGR valve under different opening, and A is the default circulation area of the EGR valve,
Δ P is pressure difference before and after the valve, ρ be exhaust gas density andPinFor exhaust gas pressure before the valve, TinFor the valve
Preceding exhaust gas temperature, R are thermodynamic gas constant.
3. system according to claim 1, which is characterized in that the engine controller is also used to:
Establish before and after the valve of the EGR valve under different opening exhaust gas temperature and the practical exhaust gas before pressure difference, the valve
Corresponding relationship between flow, and exhaust gas flow MAP chart is generated using the corresponding relationship.
4. a kind of exhaust gas flow measurement method, which is characterized in that be applied to exhaust gas flow described in claims 1 to 3 any one
Engine controller in measuring system, which comprises
The EGR valve that the temperature sensor is sent exhaust gas temperature, described first before the valve under different opening are received respectively
The EGR valve that pressure sensor is sent exhaust gas pressure, second pressure sensor before the valve under different opening are sent
EGR valve exhaust gas pressure after the valve under different opening；
The EGR valve is calculated before and after the valve under different opening according to exhaust gas pressure after exhaust gas pressure before the valve and the valve to press
Difference；
The EGR valve is calculated in difference using exhaust gas temperature before pressure difference before and after exhaust gas pressure, the valve before the valve and the valve
Theoretical exhaust gas flow under aperture；
Discharge coefficient of the EGR valve under different opening is obtained, and corrects the theoretical waste gas stream using the discharge coefficient
Measure practical exhaust gas flow of the EGR valve under different opening.
5. according to the method described in claim 4, it is characterized in that, described utilize exhaust gas pressure, valve front and back before the valve
Exhaust gas temperature calculates theoretical exhaust gas flow of the EGR valve under different opening before pressure difference and the valve, comprising:
Theoretical exhaust gas flow of the EGR valve under different opening, the Bernoulli equation are calculated according to Bernoulli equation are as follows:
Wherein, Q' is theoretical exhaust gas flow of the EGR valve under different opening, and A is the default circulation area of the EGR valve,
Δ P is pressure difference before and after the valve, ρ be exhaust gas density andPinFor exhaust gas pressure before the valve, TinFor the valve
Preceding exhaust gas temperature, R are thermodynamic gas constant.
6. according to the method described in claim 4, it is characterized in that, the method also includes:
Establish before and after the valve of the EGR valve under different opening exhaust gas temperature and the practical exhaust gas before pressure difference, the valve
Corresponding relationship between flow, and exhaust gas flow MAP chart is generated using the corresponding relationship.
7. a kind of closed loop control method, which is characterized in that be applied to the measurement of exhaust gas flow described in claims 1 to 3 any one
Engine controller in system, which comprises
The EGR valve that the temperature sensor is sent exhaust gas temperature value, described the before the valve under current aperture are received respectively
The EGR valve that one pressure sensor is sent exhaust gas pressure value, second pressure sensor hair before the valve under current aperture
The EGR valve sent exhaust gas pressure value after the valve under current aperture；
Determine before the valve under the current aperture before exhaust gas temperature value, the valve exhaust gas pressure after exhaust gas pressure value and the valve
Practical waste gas stream magnitude corresponding to force value；
It determines exhaust gas flow target value corresponding to the target EGR rate of engine operating condition, and calculates the exhaust gas flow target value
With the deviation of the practical waste gas stream magnitude；
Judge the deviation whether in predetermined deviation allowed band；
If it is not, then determining the corresponding adjusting opening value of the practical waste gas stream magnitude deviation using pid algorithm；
The target opening value of the EGR valve is calculated using the default feedforward opening value of the adjusting opening value and the EGR valve；
The EGR valve is controlled according to the target opening value, and returns to execute and described receive the temperature sensor respectively and send
The EGR valve before the valve under current aperture exhaust gas temperature value, the first pressure sensor send the EGR valve working as
The EGR valve that exhaust gas pressure value, the second pressure sensor are sent before valve under preceding aperture is after the valve under current aperture
Exhaust gas pressure value, the step for.
8. the method according to the description of claim 7 is characterized in that the method also includes:
If so, generating the prompt information for characterizing closed-loop control completion.
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