CN110552799A - Exhaust gas recirculation control method and device - Google Patents
Exhaust gas recirculation control method and device Download PDFInfo
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- 230000002159 abnormal effect Effects 0.000 claims description 23
- 239000007789 gas Substances 0.000 description 33
- 238000004364 calculation method Methods 0.000 description 5
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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
- F02D41/0025—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
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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]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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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)
Abstract
The invention provides a method and a device for controlling exhaust gas recirculation, which are applied to the technical field of engines.
Description
Technical Field
the invention belongs to the technical field of engines, and particularly relates to an exhaust gas recirculation control method and device.
Background
The EGR (Exhaust Gas Recirculation) technology mainly refers to a technology in which a part of Gas in Exhaust Gas is separated after an internal combustion engine performs combustion work, and the separated Gas is introduced into an intake side of the engine again to participate in a combustion process again, and is increasingly widely used because the Exhaust emission of NOx Gas of the engine can be significantly reduced.
in EGR technology, EGR rate is a very important concept for expressing the ratio of the amount of exhaust gas recirculated to the total amount of intake air taken into the cylinder. In practical applications, the EGR rate needs to be controlled within a reasonable range, and too high or too low EGR rate can bring adverse effects on the engine emission.
For example, when the actual intake air amount is reduced due to air leakage of an intake pipeline or failure of a component such as a throttle valve, the actual EGR rate is higher, and the emission indexes of gases such as CO and CH are increased; when the actual supercharging pressure of the air intake system is too high, the actual air intake amount of the engine is larger, and further the actual EGR rate is smaller, the gas engine knocking is possibly caused.
disclosure of Invention
in view of the above, an object of the present invention is to provide an exhaust gas recirculation control method and apparatus, which adjust an EGR rate according to an engine operating condition, and avoid adverse effects on engine operation and emissions caused by too high or too low EGR rate, and the specific scheme is as follows:
In a first aspect, the present invention provides an exhaust gas recirculation control method including:
acquiring a required value and an actual value of a preset parameter for representing the air inflow of the engine under the current working condition, and an initial EGR rate;
judging whether the engine has abnormal air intake or not according to the required value of the preset parameter and the actual value of the preset parameter;
If the air inlet of the engine is abnormal, determining an EGR rate correction value under the current working condition;
correcting the initial EGR rate according to the EGR rate correction value to obtain a corrected EGR rate;
and controlling the EGR valve to work according to the corrected EGR rate.
optionally, the determining whether the engine is abnormal in intake according to the required value of the preset parameter and the actual value of the preset parameter includes:
Calculating the difference value between the required value of the preset parameter and the actual value of the preset parameter to obtain a deviation value of the preset parameter;
If the deviation value of the preset parameter is in a preset range, judging that the air intake of the engine is normal;
And if the deviation value of the preset parameter is not in the preset range, judging that the air intake of the engine is abnormal.
optionally, the determining the EGR rate correction value under the current operating condition includes:
acquiring the rotating speed of an engine under the current working condition;
And determining the EGR rate correction value under the current working condition according to a first preset mapping relation, the engine speed and the preset parameter deviation value, wherein the first preset mapping relation records the corresponding relation of the engine speed, the preset parameter deviation value and the EGR rate correction value.
optionally, the correcting the initial EGR rate according to the EGR rate correction value to obtain a corrected EGR rate includes:
And calculating the difference value of the initial EGR rate and the EGR rate correction value to obtain the corrected EGR rate.
optionally, obtaining the initial EGR rate under the current operating condition includes:
Acquiring the engine speed and the required air inflow of the engine under the current working condition;
and determining the initial EGR rate under the current working condition according to a second preset mapping relation, the engine speed and the engine required air inflow, wherein the corresponding relation between the engine speed, the engine required air inflow and the initial EGR rate is recorded in the second preset mapping relation.
Optionally, the preset parameter includes an intake pressure or an intake flow rate.
Alternatively, the exhaust gas recirculation control method according to any one of the first aspect of the present invention further includes:
And if the air inlet of the engine is normal, controlling the EGR valve to work according to the initial EGR rate.
In a second aspect, the present invention provides an exhaust gas recirculation control apparatus comprising:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a required value and an actual value of a preset parameter for representing the air inflow of the engine under the current working condition, and an initial EGR rate;
The judging unit is used for judging whether the engine is abnormal in air intake or not according to the required value of the preset parameter and the actual value of the preset parameter;
the determining unit is used for determining an EGR rate correction value under the current working condition if the air intake of the engine is abnormal;
The correction unit is used for correcting the initial EGR rate according to the EGR rate correction value to obtain a corrected EGR rate;
And a first control unit for controlling the operation of the EGR valve according to the corrected EGR rate.
optionally, the determining unit is configured to determine whether the engine has abnormal intake according to the required value of the preset parameter and the actual value of the preset parameter, and specifically includes:
calculating the difference value between the required value of the preset parameter and the actual value of the preset parameter to obtain a deviation value of the preset parameter;
If the deviation value of the preset parameter is in a preset range, judging that the air intake of the engine is normal;
and if the deviation value of the preset parameter is not in the preset range, judging that the air intake of the engine is abnormal.
Optionally, the determining unit, configured to determine the EGR rate correction value under the current operating condition, specifically includes:
Acquiring the rotating speed of an engine under the current working condition;
and determining the EGR rate correction value under the current working condition according to a first preset mapping relation, the engine speed and the preset parameter deviation value, wherein the first preset mapping relation records the corresponding relation of the engine speed, the preset parameter deviation value and the EGR rate correction value.
the exhaust gas recirculation control method provided by the invention can adjust the EGR rate according to the operation condition of the engine, thereby avoiding the adverse effects on the operation of the engine and the exhaust emission of the engine due to overhigh or overlow EGR rate.
Drawings
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of an exhaust gas recirculation control method provided by an embodiment of the present invention;
fig. 2 is a block diagram showing an arrangement of an exhaust gas recirculation control apparatus according to an embodiment of the present invention;
Fig. 3 is a block diagram of another exhaust gas recirculation control apparatus according to an embodiment of the present invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
in the prior art, for an engine provided with a throttle valve and a supercharger electronic control air release valve on an air inlet pipeline, or a variable-section electronic control turbocharger, closed-loop control of the required air input and the actual air input of the engine can be realized by controlling the throttle valve and the supercharger electronic control air release valve, or the variable-section electronic control turbocharger, that is, close following of the actual air input and the required air input is realized, and the difference value between the actual air input and the required air input is within a preset range. Therefore, whether the air leakage and the low air inlet pressure exist in the engine air inlet system or not can be judged through the actual air inlet amount and the required air inlet amount, or the actual air inlet amount is larger than the fault condition of the required air inlet amount, the EGR rate is adjusted, the EGR rate is controlled within a reasonable range, and the adverse effect on the emission of the engine can be caused due to the overhigh or overlow EGR rate.
based on the above premise, referring to fig. 1, fig. 1 is a flowchart of an exhaust gas recirculation control method according to an embodiment of the present invention, and the exhaust gas recirculation control method according to the embodiment of the present invention may be applied to a microcontroller, where the microcontroller may be an engine controller or a controller disposed on a vehicle such as a vehicle controller and capable of operating the exhaust gas recirculation control method according to the embodiment of the present invention, and of course, in some cases, the control method according to the embodiment of the present invention may also be implemented by a server on a network side. Specifically, the flow of the exhaust gas recirculation control method provided by the embodiment of the invention includes:
And S100, acquiring a required value and an actual value of a preset parameter for representing the air inflow of the engine under the current working condition, and acquiring an initial EGR rate.
Alternatively, the initial EGR rate according to the embodiment of the invention may be determined based on the engine speed and the engine required intake air amount. In order to conveniently, quickly and accurately determine the initial EGR rate under the current working condition, the embodiment of the invention provides a second preset mapping relation, and the corresponding relation between the engine speed, the engine required air inflow and the initial EGR rate is recorded in the second preset mapping relation. Therefore, after the engine speed under the current working condition and the required air intake quantity of the engine are obtained, the second preset mapping relation is inquired, and the initial EGR rate corresponding to the engine speed and the required air intake quantity of the engine under the current working condition can be directly determined.
It should be noted that, in the construction of the second preset map, the selection of the engine demanded intake air amount as one of the parameters is to consider that the actual intake air amount of the engine has hysteresis, and cannot meet the demand for real-time control of the engine intake air amount and the EGR exhaust gas amount.
It should be further noted that, when the second preset mapping relationship is constructed, for the gas engine, the gas engine needs to be controlled to completely mix and combust air and fuel gas according to the air-fuel ratio, and the air intake amount is strictly controlled, so that the parameter of the air intake amount required by the engine can be directly used. For the diesel engine, the diesel engine generally adopts an ultra-lean combustion mode, the actual air inflow of air is always larger than the required air inflow, namely the air is always excessive, and if the engine required air inflow is still adopted to construct the second preset mapping relation, the second preset mapping relation is obviously not accurate enough, so that the engine required oil injection quantity can be selected to replace the parameter of the engine required air inflow. Of course, under the condition of low accuracy requirement, the diesel engine can also select the parameter of the required air inflow to construct the second preset mapping relation, and perform relevant judgment based on the second preset relation.
The required air inflow is a parameter, the required torque of the engine can be obtained through the opening degree of an accelerator pedal or an external rotating speed control parameter in the prior art, and the required air inflow under the current working condition is further determined according to the corresponding relation among the rotating speed of the engine, the required torque of the engine and the required air inflow. For off-road engines, the required intake air amount may also be determined directly by the engine speed alone. In the exhaust gas recirculation control method provided by the embodiment of the invention, the specific acquisition method of the required intake air amount is not limited, and the methods in the prior art are optional.
Furthermore, considering that when the air inlet pipeline of the engine leaks or the actual air inlet amount is larger than the required air inlet amount, the air inlet amount of the engine obviously changes, and the air inlet amount of the engine has certain hysteresis, in the embodiment of the invention, the preset parameters capable of representing the air inlet amount of the engine are selected to identify the fault condition.
Optionally, the preset parameters that can be used for characterizing the engine intake air amount at least include intake pressure and intake air flow, and of course, other parameters that can be used for measuring the change of the engine intake air amount may also be included, and the parameters also belong to the protection scope of the present invention on the premise of not exceeding the core idea scope of the present invention.
It is conceivable that, in the specific judgment, a preset parameter is generally selected, for example, a required value and an actual value of the intake pressure or a required value and an actual value of the intake flow rate are selected. As for the specific parameter to be selected as the preset parameter according to the embodiment of the present invention, it is further required to be selected in combination with the configuration of the vehicle itself and other setting conditions, for example, if an intake pressure sensor is disposed in an intake pipe of the vehicle, the intake pressure may be selected as the preset parameter; accordingly, if the vehicle intake pipe is provided with an intake air flow sensor, the intake air flow rate may be selected as the preset parameter.
if the preset parameter is the intake pressure, the required value and the actual value of the intake pressure under the current working condition need to be acquired correspondingly. As mentioned above, the actual value of the intake pressure may be realized by reading the actual value fed back by the intake pressure sensor under the current operating condition. And the required value of the intake pressure can be obtained by calculating the required intake air amount, the engine speed, the cylinder displacement and the air density under the current working condition.
Specifically, the ratio of the mass of fresh air actually drawn into the cylinder per cylinder and per cycle of the engine to the mass of air filling the working volume of the cylinder at the theoretical intake state (one standard atmosphere, intake temperature of 273k) is called the charge factor, and is denoted as r 1 in this embodiment.
as can be seen from the above definition, the pressure of the intake air entering the engine cylinders is proportional to the charge coefficient, as shown in equation (1):
r1＝p1/p0*(t-273/273) (1)
wherein p 1 represents the post-throttle intake pressure;
p 0 represents a standard atmospheric pressure;
And t is the actual intake air temperature.
meanwhile, according to the definition of the charging coefficient, the calculation formula (2) can be obtained:
r1＝m1/m0 (2)
wherein r 1 represents the foregoing charge coefficient;
m 1 represents the required intake air amount;
m 0 represents the intake air amount to fill the cylinder in the theoretical state.
further, m 0 can also be represented by formula (3):
m0＝ρ*(NEng/2)*VEng (3)
Where ρ represents an intake gas density of the engine;
v Eng represents the single cylinder intake air quantity, which is the quotient of the engine displacement divided by the number of cylinders;
N Eng represents the engine speed, and the unit is converted to "rpm".
combining the above equations, another calculation equation of the required intake air amount m 1 can be obtained:
m1＝r1*p*(NEng/2)*VEng (4)
according to the ratio k of the air pressure before the throttle valve to the air pressure before the throttle valve (in practical applications, both the two pressure values can be obtained by the intake pressure sensor), the pressure before the throttle valve, i.e., the intake pressure p 2 according to the embodiment of the present invention, can be expressed by equation (5):
p2＝k*p1 (5)
therefore, according to the method in the prior art, the required intake air amount m 1 under the current working condition can be determined, the charging coefficient can be further determined, and then the required intake pressure under the current working condition can be calculated according to the charging coefficient under the current working condition and the ratio of the pressure of the air at the back of the throttle valve to the pressure of the air at the front of the throttle valve.
If the preset parameter is the intake air flow, the intake air flow demand value and the intake air flow actual value under the current working condition need to be acquired correspondingly. As described above, the actual value of the intake air flow rate may be realized by reading the actual value fed back by the intake air flow rate sensor under the current operating condition. The intake air flow demand value can be calculated by adopting a calculation method in the prior art, and the specific calculation method of the intake air flow demand value is not limited in the embodiment of the invention.
And S110, judging whether the engine has abnormal air intake according to the required value of the preset parameter and the actual value of the preset parameter, if so, executing S120, and if not, executing S150.
optionally, after obtaining the required value of the preset parameter and the actual value of the preset parameter, calculating a difference between the required value of the preset parameter and the actual value of the preset parameter to obtain a deviation value of the preset parameter, if the deviation value of the preset parameter is within a preset range, determining that the air intake of the engine is normal, and executing S150; correspondingly, if the deviation value of the preset parameter is not in the preset range, the intake of the engine is judged to be abnormal, and S120 is executed.
Taking the preset parameter as the intake pressure, for example, the required intake pressure is p set, the actual intake pressure is p act, and the intake pressure deviation value is Δ p ═ p set -p act. when the actual intake pressure can follow the change of the required pressure, i.e., there is no leakage or other fault in the intake line that causes the increase of the intake pressure, Δ p will be within the preset range, and conversely, when the actual intake pressure is difficult to follow the change of the required pressure, Δ p cannot be within the preset range.
Optionally, for convenience of calculation, the determination may be performed according to an absolute value of Δ p, and when the absolute value of Δ p is smaller than a constant C (a positive number, i.e., a boundary value of the preset range), it is considered that the pressure may be normally closed, and at this time, the required EGR rate does not need to be corrected; accordingly, when the absolute value of Δ p is larger than C, the EGR rate needs to be corrected.
the intake flow rate and the intake pressure have the same change rule, and the determination process based on the intake flow rate is similar to the determination process based on the intake pressure, and is not described again here.
And S120, determining an EGR rate correction value under the current working condition.
In the case of determining that the engine intake air is abnormal, the EGR rate needs to be corrected, and in order to achieve the correction, an EGR rate correction value at the current operating condition needs to be determined first.
optionally, in order to determine the EGR rate correction value under different working conditions, the embodiment of the present invention further provides a first preset mapping relationship, where a corresponding relationship between the engine speed, the preset parameter deviation value, and the EGR rate correction value is recorded in the first preset mapping relationship. Specifically, if the preset parameter is selected as the intake pressure, the corresponding relationship between the engine speed, the intake pressure deviation value and the EGR rate correction value is recorded in the first preset mapping relationship, and correspondingly, if the preset parameter is selected as the intake air flow, the corresponding relationship between the engine speed, the intake air flow deviation value and the EGR rate correction value is recorded in the first preset mapping relationship. Alternatively, the EGR rate correction values in the different cases described in the embodiments of the present invention may be set according to experimental data of a bench test or human experience.
according to the composition of the first preset mapping relation, in order to determine the EGR rate correction value, the engine speed under the current working condition needs to be obtained, after the engine speed under the current working condition is obtained, the first preset mapping relation can be inquired according to the engine speed and the preset parameter deviation value, and the EGR rate correction value under the current working condition is determined according to the first preset mapping relation.
And S130, correcting the initial EGR rate according to the EGR rate correction value to obtain the corrected EGR rate.
Optionally, after the EGR rate correction value under the current working condition is obtained, a difference between the initial EGR rate and the EGR rate correction value is calculated, and the obtained difference is the corrected EGR rate.
it should be noted that, for the case where the engine intake pressure or intake air flow is insufficient, the EGR rate correction value is a positive number greater than zero, and the corrected EGR rate is smaller than the initial EGR rate; accordingly, for the case of engine over-supercharging, the EGR rate correction value is negative less than zero and the corrected EGR rate will be greater than the initial EGR rate.
And S140, controlling the EGR valve to work according to the corrected EGR rate.
After the corrected EGR rate is obtained, the operation of the EGR valve can be controlled according to the corrected EGR rate. The process of controlling the operation of the EGR valve according to the EGR rate can be performed in the manner of the prior art, and will not be described herein.
And S150, controlling the EGR valve to work according to the initial EGR rate.
If the step of judging whether the engine has intake abnormity according to the required value of the preset parameter and the actual value of the preset parameter in S110, the engine is judged to have no intake abnormity, the initial EGR rate does not need to be corrected, and the EGR valve is controlled to work according to the initial EGR rate.
In summary, according to the exhaust gas recirculation control method provided by the invention, a required value and an actual value of a preset parameter under the current working condition and an initial EGR rate are firstly obtained, if the intake abnormality of the engine is judged according to the required value and the actual value of the preset parameter, an EGR rate correction value under the current working condition is further determined, the initial EGR rate is corrected according to the EGR rate correction value to obtain a corrected EGR rate, and finally the EGR valve is controlled to work according to the corrected EGR rate.
In the following, the exhaust gas recirculation control apparatus provided in the embodiment of the present invention is described, and the exhaust gas recirculation control apparatus described below may be regarded as a functional module architecture that needs to be provided in the central device to implement the exhaust gas recirculation control method provided in the embodiment of the present invention; the following description may be cross-referenced with the above.
Alternatively, referring to fig. 2, fig. 2 is a block diagram of an exhaust gas recirculation control device according to an embodiment of the present invention, where the control device according to the embodiment of the present invention may include:
an obtaining unit 10, configured to obtain a required value and an actual value of a preset parameter for representing an engine intake air amount under a current working condition, and an initial EGR rate;
The judging unit 20 is used for judging whether the engine is abnormal in air intake or not according to the required value of the preset parameter and the actual value of the preset parameter;
the determining unit 30 is used for determining an EGR rate correction value under the current working condition if the air intake of the engine is abnormal;
A correcting unit 40, configured to correct the initial EGR rate according to the EGR rate correction value, so as to obtain a corrected EGR rate;
And a first control unit 50 for controlling the operation of the EGR valve in accordance with the corrected EGR rate.
Optionally, the determining unit 20 is configured to determine whether the engine is abnormal in intake according to the required value of the preset parameter and the actual value of the preset parameter, and specifically includes:
calculating the difference value between the required value of the preset parameter and the actual value of the preset parameter to obtain a deviation value of the preset parameter;
if the deviation value of the preset parameter is in a preset range, judging that the air intake of the engine is normal;
And if the deviation value of the preset parameter is not in the preset range, judging that the air intake of the engine is abnormal.
Optionally, the determining unit 30 is configured to, when determining the EGR rate correction value under the current operating condition, specifically include:
Acquiring the rotating speed of an engine under the current working condition;
And determining the EGR rate correction value under the current working condition according to a first preset mapping relation, the engine speed and the preset parameter deviation value, wherein the first preset mapping relation records the corresponding relation of the engine speed, the preset parameter deviation value and the EGR rate correction value.
Optionally, the correcting unit 40 is configured to correct the initial EGR rate according to the EGR rate correction value, and when obtaining a corrected EGR rate, specifically includes:
and calculating the difference value of the initial EGR rate and the EGR rate correction value to obtain the corrected EGR rate.
Optionally, the obtaining unit 10 is configured to, when obtaining the initial EGR rate under the current operating condition, specifically include:
acquiring the engine speed and the required air inflow of the engine under the current working condition;
And determining the initial EGR rate under the current working condition according to a second preset mapping relation, the engine speed and the engine required air inflow, wherein the corresponding relation between the engine speed, the engine required air inflow and the initial EGR rate is recorded in the second preset mapping relation.
Optionally, the preset parameter includes an intake pressure or an intake flow rate.
optionally, referring to fig. 3, fig. 3 is a block diagram of another exhaust gas recirculation control device provided in the embodiment of the present invention, and on the basis of the embodiment shown in fig. 2, the device provided in the embodiment of the present invention specifically further includes:
and a second control unit 60 for controlling the operation of the EGR valve according to the initial EGR rate if the engine intake is normal.
the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
the previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. an exhaust gas recirculation control method characterized by comprising:
acquiring a required value and an actual value of a preset parameter for representing the air inflow of the engine under the current working condition, and an initial EGR rate;
judging whether the engine has abnormal air intake or not according to the required value of the preset parameter and the actual value of the preset parameter;
If the air inlet of the engine is abnormal, determining an EGR rate correction value under the current working condition;
correcting the initial EGR rate according to the EGR rate correction value to obtain a corrected EGR rate;
and controlling the EGR valve to work according to the corrected EGR rate.
2. The exhaust gas recirculation control method according to claim 1, wherein the determining whether the intake of the engine is abnormal based on the required value of the preset parameter and the actual value of the preset parameter includes:
calculating the difference value between the required value of the preset parameter and the actual value of the preset parameter to obtain a deviation value of the preset parameter;
if the deviation value of the preset parameter is in a preset range, judging that the air intake of the engine is normal;
And if the deviation value of the preset parameter is not in the preset range, judging that the air intake of the engine is abnormal.
3. The exhaust gas recirculation control method according to claim 2, wherein the determining the EGR rate correction value at the current operating condition includes:
Acquiring the rotating speed of an engine under the current working condition;
and determining the EGR rate correction value under the current working condition according to a first preset mapping relation, the engine speed and the preset parameter deviation value, wherein the first preset mapping relation records the corresponding relation of the engine speed, the preset parameter deviation value and the EGR rate correction value.
4. The exhaust gas recirculation control method according to claim 1, wherein the correcting the initial EGR rate according to the EGR rate correction value, resulting in a corrected EGR rate, includes:
And calculating the difference value of the initial EGR rate and the EGR rate correction value to obtain the corrected EGR rate.
5. the exhaust gas recirculation control method according to claim 1, wherein obtaining the initial EGR rate at the current operating condition includes:
acquiring the engine speed and the required air inflow of the engine under the current working condition;
And determining the initial EGR rate under the current working condition according to a second preset mapping relation, the engine speed and the engine required air inflow, wherein the corresponding relation between the engine speed, the engine required air inflow and the initial EGR rate is recorded in the second preset mapping relation.
6. the exhaust gas recirculation control method according to any one of claims 1 to 5, wherein the preset quantity includes an intake pressure or an intake flow rate.
7. the exhaust gas recirculation control method according to any one of claims 1 to 5, characterized by further comprising:
and if the air inlet of the engine is normal, controlling the EGR valve to work according to the initial EGR rate.
8. An exhaust gas recirculation control apparatus, characterized by comprising:
The device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a required value and an actual value of a preset parameter for representing the air inflow of the engine under the current working condition, and an initial EGR rate;
the judging unit is used for judging whether the engine is abnormal in air intake or not according to the required value of the preset parameter and the actual value of the preset parameter;
the determining unit is used for determining an EGR rate correction value under the current working condition if the air intake of the engine is abnormal;
the correction unit is used for correcting the initial EGR rate according to the EGR rate correction value to obtain a corrected EGR rate;
and a first control unit for controlling the operation of the EGR valve according to the corrected EGR rate.
9. The egr control device according to claim 1, wherein the judging unit, when judging whether the engine is abnormal in intake air based on the required value of the preset parameter and the actual value of the preset parameter, specifically comprises:
Calculating the difference value between the required value of the preset parameter and the actual value of the preset parameter to obtain a deviation value of the preset parameter;
If the deviation value of the preset parameter is in a preset range, judging that the air intake of the engine is normal;
And if the deviation value of the preset parameter is not in the preset range, judging that the air intake of the engine is abnormal.
10. the EGR control apparatus according to claim 9, wherein the determining unit, when determining the EGR rate correction value under the current operating condition, specifically includes:
Acquiring the rotating speed of an engine under the current working condition;
And determining the EGR rate correction value under the current working condition according to a first preset mapping relation, the engine speed and the preset parameter deviation value, wherein the first preset mapping relation records the corresponding relation of the engine speed, the preset parameter deviation value and the EGR rate correction value.
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