CN111736456A - Control and diagnosis mechanism of EGR (exhaust gas Recirculation) system, heavy-duty car and method - Google Patents
Control and diagnosis mechanism of EGR (exhaust gas Recirculation) system, heavy-duty car and method Download PDFInfo
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- 230000007246 mechanism Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000003745 diagnosis Methods 0.000 title abstract description 12
- 239000002826 coolant Substances 0.000 claims abstract description 6
- 239000000110 cooling liquid Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 3
- 238000002405 diagnostic procedure Methods 0.000 claims 3
- 239000007789 gas Substances 0.000 abstract description 37
- 238000004364 calculation method Methods 0.000 abstract description 7
- 230000003068 static effect Effects 0.000 abstract description 5
- 230000004044 response Effects 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 239000000446 fuel Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
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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
Abstract
The invention provides a control and diagnosis mechanism of an EGR system, a heavy-duty car and a method, wherein an atmospheric pressure sensor measures atmospheric pressure; a coolant temperature sensor measures a temperature of engine coolant; the air flow sensor measures the fresh air intake quantity; the air inlet temperature and pressure sensor calculates the flow of the mixed air; the EGR valve is used for controlling the flow of exhaust gas entering an engine cylinder; a position sensor is integrated on the EGR valve for measuring an actual opening of the EGR valve. When the target fresh air amount is calculated, a mode of combining a static model and a dynamic model is adopted for calculation, and the control requirement of the engine under each working condition is met. And the two modes of EGR waste gas flow deviation and EGR valve opening deviation are adopted for judgment, so that the faults of low or high EGR valve flow, EGR valve clamping, slow EGR valve response and the like can be diagnosed, the fault diagnosis and judgment of the EGR valve are more accurate, and the diagnosis requirements of user use and regulations are met.
Description
Technical Field
The invention relates to the technical field of exhaust gas recirculation, in particular to a control and diagnosis mechanism of an EGR (exhaust gas recirculation) system, a heavy-duty car and a method.
Background
With the stricter and stricter requirements of national regulations on the emission of heavy automobile exhaust, the emission of automobile exhaust is called an important standard for measuring the quality of automobiles.
EGR (exhaust gas recirculation) is an important technology for reducing exhaust emissions from diesel engines, and part of exhaust gas discharged from the engine is returned to an intake manifold, mixed with fresh air, and re-introduced into a cylinder, so that the oxygen concentration and the maximum combustion temperature of the mixture in the cylinder are reduced, thereby reducing the amount of NOx generated. Excessive exhaust gas reduces NOx emissions from the engine, but increases particulate matter emissions and affects engine fuel consumption and power. Control of the amount of exhaust gas is therefore an important requirement for meeting engine economy, dynamics and emissions.
When the EGR valve fails, the EGR valve cannot work according to a set target, which affects the dynamic property and exhaust gas components of the engine, so how to implement fault diagnosis of the EGR valve, ensure the economical efficiency and dynamic property of the engine, and meet the emission requirements is also a technical problem to be solved urgently at present.
Disclosure of Invention
To overcome the above-mentioned deficiencies in the prior art, the present invention provides a control and diagnostic mechanism for an EGR system, comprising: an atmospheric pressure sensor, a coolant temperature sensor, an air flow sensor, an intake air temperature pressure sensor, an EGR valve, a position sensor, and a controller;
the atmospheric pressure sensor is used for measuring atmospheric pressure in the current environment and transmitting detected atmospheric pressure data to the controller;
the cooling liquid temperature sensor is arranged on the engine cooling pipeline and used for measuring the temperature of the engine cooling liquid and transmitting the detected temperature data to the controller;
the air flow sensor is arranged on a pipeline in front of the mixed gas of the supercharger and the intercooler and used for measuring the air inflow of the fresh air and transmitting the detected data of the air inflow of the fresh air to the controller;
the intake temperature and pressure sensor is arranged on a pipeline behind the mixed gas and used for measuring the temperature and the pressure of the mixed gas and transmitting the detected temperature and pressure data of the mixed gas to the controller to calculate the flow of the mixed gas.
The EGR valve is arranged on a pipeline between an air inlet pipe and an exhaust pipe of the engine and used for controlling the flow of exhaust gas entering an engine cylinder;
a position sensor is integrated with the EGR valve for measuring an actual opening of the EGR valve and transmitting actual opening data to the controller.
It is further noted that the controller controls the intake air amount to the engine cylinder such that the intake air amount to the engine cylinder is equal to the sum of the fresh air intake air amount and the amount of exhaust gas to the cylinder through the EGR valve.
It is further noted that the controller obtains temperature and pressure through an intake air temperature and pressure sensor; the controller calculates the intake air amount by the following formula:
wherein: n is engine speed, V is cylinder volume, PIntkFacVolEff is the coefficient of charge of the cylinder, T, for intake pressureIntkTo the inlet air temperature, KCorAre coefficients.
It is further noted that the controller is controlled by
mEGR＝mMixing-mFresh air
Acquiring the flow rate of exhaust gas entering a cylinder from an EGR valve;
by passing
Obtaining an EGR rate;
the controller controls the opening degree and the EGR rate of the EGR valve through the fresh air intake amount;
when the deviation between the obtained exhaust gas flow rate and the target exhaust gas flow rate exceeds a set value, it is determined that the EGR valve has a failure.
Further, the controller acquires an actual opening degree of the EGR valve by the position sensor, and determines that the EGR valve is defective when a deviation of the actual opening degree from a preset opening degree exceeds a set value.
The present invention also provides a heavy duty vehicle comprising; control and diagnostic mechanisms for EGR systems.
The invention also provides a control and diagnosis method of the EGR system, which comprises the following steps:
step one, judging whether an EGR valve is in a closed-loop control state or not;
second, actual opening r of the EGR valve measured by the position sensorActWith a target opening rDesIs a difference r ofDvtJudging whether the difference value is larger than a set value rDvtMax；
Third step, if said difference rDvtGreater than a set value rDvtMaxThen, the actual opening r of the EGR valve is judgedActWhether or not it is larger than a set value rOpen；
If the EGR valve is larger than the set value, the EGR valve is clamped in an opening state;
if not, the actual opening r of the EGR valve is judgedActWhether or not it is less than a set value rClsd；
If the EGR valve is smaller than the set value, the EGR valve is clamped in a closed state;
otherwise, the EGR valve is clamped at the middle position;
step four, if the difference rDvtIs not greater than a set value rDvtMaxJudging whether the difference is less than a set value rDvtMin；
Step five, if the difference rDvtIs less than a set value rDvtMinThen, the actual opening r of the EGR valve is judgedActWhether or not it is larger than a set value rOpen；
If the EGR valve is larger than the set value, the EGR valve is clamped in an opening state;
if not, the actual opening r of the EGR valve is judgedActWhether or not it is less than a predetermined value rClsd；
If the EGR valve is smaller than the set value, the EGR valve is clamped in a closed state;
otherwise, the EGR valve is clamped at the middle position;
sixthly, judging the current actual exhaust gas flow mEGRActAnd target exhaust gas flow rate mEGRDesDifference m ofEGRDvt；
When the difference m isEGRDvtGreater than a set value mEGRDvtMaxAnd if so, reporting the fault of high flow of the EGR valve.
If the difference m isEGRDvtIs not more than a set value mEGRDvtMaxJudging whether the value is less than a set value mEGRDvtMinIf the difference m isEGRDvtLess than a set value mEGRDvtMinAnd reporting the fault that the flow of the EGR valve is low.
If the difference r isDvtAnd the difference mEGRDvtAre within the preset range, the EGR valve is not malfunctioning.
According to the technical scheme, the invention has the following advantages:
the opening degree of the EGR valve is controlled based on the fresh air intake quantity, PID control is carried out through the difference value of the fresh air intake quantity required by combustion and the actual fresh air intake quantity under each working condition to obtain the target opening degree of the EGR valve, and PID control is carried out through the difference value of the actual opening degree and the target opening degree of the EGR valve measured by the EGR valve position sensor to obtain the duty ratio of the EGR valve control which is finally output. And the fresh air intake quantity and the EGR rate under each working condition are accurately controlled by two PID controllers. When the target fresh air amount is calculated, a mode of combining a static model and a dynamic model is adopted for calculation, and the control requirement of the engine under each working condition is met. And the two modes of EGR waste gas flow deviation and EGR valve opening deviation are adopted for judgment, so that the faults of low or high EGR valve flow, EGR valve clamping, slow EGR valve response and the like can be diagnosed, the fault diagnosis and judgment of the EGR valve are more accurate, and the diagnosis requirements of user use and regulations are met.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a control and diagnostic mechanism for an EGR system;
FIG. 2 is a block diagram of control logic according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a dynamic model of a target intake air quantity;
FIG. 4 is a block diagram of control logic according to an embodiment of the present invention;
FIG. 5 is a flow chart of an embodiment of a method.
Detailed Description
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the 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 block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations or operations have not been shown or described in detail to avoid obscuring aspects of the invention.
The present invention provides a control and diagnostic mechanism for an EGR system, as shown in fig. 1 to 5, comprising: an atmospheric pressure sensor, a coolant temperature sensor, an air flow sensor 3, an intake air temperature pressure sensor 4, an EGR valve 6, a position sensor, and a controller;
the atmospheric pressure sensor is used for measuring atmospheric pressure in the current environment and transmitting detected atmospheric pressure data to the controller; the cooling liquid temperature sensor is arranged on the engine cooling pipeline and used for measuring the temperature of the engine cooling liquid and transmitting the detected temperature data to the controller; the air flow sensor 3 is arranged on a pipeline in front of the mixed gas of the supercharger 1 and the intercooler 2 and used for measuring the air inflow of the fresh air and transmitting the detected data of the air inflow of the fresh air to the controller; and the intake temperature and pressure sensor 4 is arranged on a pipeline behind the mixed gas and used for measuring the temperature and the pressure of the mixed gas and transmitting the detected temperature and pressure data of the mixed gas to the controller to calculate the flow of the mixed gas. The EGR valve is arranged on a pipeline between an air inlet pipe and an exhaust pipe of the engine and used for controlling the flow of exhaust gas entering an engine cylinder; a position sensor is integrated on the EGR valve 6 for measuring the actual opening degree of the EGR valve and transmitting the actual opening degree data to the controller. In the present invention, a check valve 7 may be provided at one end of the EGR valve 6 to prevent reverse flow.
In the present invention, the intake air amount into the engine cylinder 5 is equal to the sum of the fresh air intake air amount and the exhaust gas amount into the cylinder through the EGR valve.
mMixing＝mFresh air+mEGR
The fresh air intake amount can be obtained by directly measuring an intake flow sensor arranged behind the supercharged intercooler and in front of the mixed air.
The mixed intake air amount may be calculated from the temperature and pressure of the air-fuel mixture measured by an intake air temperature pressure sensor installed behind the air-fuel mixture. The calculation formula derived from the ideal gas equation is as follows:
wherein: n is engine speed, V is cylinder volume, PIntkFacVolEff is the coefficient of charge of the cylinder, T, for intake pressureIntkTo the inlet air temperature, KCorAre coefficients.
The total volume of the cylinder is fixed, so under a certain working condition, the oil injection quantity is fixed, and the air inflow entering the cylinder is also fixed. The more the amount of exhaust gas entering the cylinder, the less the amount of fresh air, and the flow of exhaust gas entering the cylinder through the EGR valve is:
mEGR＝mmixing-mFresh air
The EGR valve opening degree and the EGR rate can be controlled by the fresh air intake amount.
When the deviation of the calculated exhaust gas flow rate from the target exhaust gas flow rate exceeds the set value, it can be considered that there is a problem with the control of the EGR valve, that is, a malfunction occurs.
The EGR valve position sensor may feed back an actual opening degree of the EGR valve, and when a deviation of the actual opening degree from the target opening degree exceeds a set value, it may be considered that there is a problem with the control of the EGR valve, that is, a failure occurs.
The specific control logic of the invention is as follows:
as shown in the control logic block diagram of FIG. 2, the opening degree of the EGR valve is controlled based on the fresh air intake quantity m required by combustion under each working conditionDesAnd the actual fresh air intake mActDifference m ofDvtAnd performing PID control. According to the operating condition of the engine and mDvtAdopts different PID control parameters, and improves the response speed and the control precision.
Calculation of target intake air amount:
and the calculation of the target air input is realized by combining a static model and a dynamic model. Through the calculated values of the two models, the target air inflow required by the engine under different working conditions is obtained, and the air inflow is used as the main basis for controlling the EGR valve.
Static model of target air input:
a target intake air amount basic value is calculated based on the engine speed and the oil amount. Since the engine requires different intake air amounts under different environmental conditions, such as low temperature, high temperature, and high altitude, the basic values are corrected using the coolant temperature, the intake air temperature, and the atmospheric pressure. In addition, the calculated value is corrected and calculated based on the boost pressure in consideration of the cooperative control of the boost pressure and the EGR valve. The calculated value is defined between the minimum intake air amount and the maximum intake air amount.
The dynamic model of the target intake air amount is shown in fig. 3:
in the transient process, a dynamic model of the target intake air amount is established. The dynamic value is calculated from the maximum and minimum intake air amounts based on the minimum lambda value and the minimum EGR rate after supercharging.
Under a certain operating condition of the engine, the minimum target intake air amount can be calculated based on the minimum lambda value. Based on the minimum EGR rate, the maximum target intake air amount may be calculated. The dynamic value can be adjusted by a parameter depending on the priority of NOX and soot emission control.
And performing PID control according to the difference value between the target fresh air intake quantity and the actual fresh air intake quantity to obtain the EGR valve opening degree closed-loop value. And adding the opening ring value to obtain the target opening degree of the EGR valve.
The monitoring function defaults the target opening of the EGR valve under certain special conditions and when the EGR valve fails. For example, the EGR valve may be fully closed when the EGR valve fails.
Calculating an EGR valve target opening degree open loop value:
and calculating a basic value of the opening degree of an EGR valve opening ring based on the engine speed and the oil quantity, and correcting the value by using the temperature of the cooling liquid, the air inlet temperature and the atmospheric pressure to ensure that the EGR valve is controlled to be at a proper opening degree in high-temperature, low-temperature and plateau regions. The final opening calculation value limit is between a maximum opening and a minimum opening.
As shown in the control logic diagram of FIG. 4, the control of the EGR valve is realized by establishing a closed-loop controller model to make the actual opening r of the EGR valveActReaches the target opening rDes. Wherein the actual opening degree r of the EGR valveActMeasured by a position sensor mounted on the EGR valve. According to the running condition of the engine and the deviation r between the actual opening and the target openingDvtAdopts different PID control parameters, and improves the response speed and the control precision. The control value of the EGR valve is converted into a duty ratio by a conversion curve.
The invention also provides a heavy-duty car based on the control and diagnosis mechanism of the EGR system, which comprises a main engine, a main engine and a main engine, wherein the main engine is connected with the main engine; control and diagnostic mechanisms for EGR systems. Heavy vehicles may be trucks, trailers and construction machinery.
The present invention also provides a method of controlling and diagnosing an EGR system, as shown in fig. 5, the method comprising:
first, whether the EGR valve is in a closed-loop control state is judged. The diagnosis is only performed in the closed-loop control state.
Secondly, calculating the actual opening r of the EGR valve measured by the EGR valve position sensor under the working conditionActWith a target opening rDesIs a difference r ofDvtJudging whether the difference is larger than a set value rDvtMaxIs there a Wherein the actual opening rActMeasured by an EGR valve position sensor. Target opening rDesBy closed loop control of the EGR valve.
Third step, if the difference rDvtGreater than a set value rDvtMaxThen, the actual opening r of the EGR valve is judgedActWhether or not it is larger than a set value rOpen. If greater than the set point, the EGR valve is stuck in an open state. If not, the actual opening r of the EGR valve is judgedActWhether or not it is less than a set value rClsd. If less than the set point, the EGR valve is stuck in a closed state. Otherwise, the EGR valve is stuck in a neutral position.
The fourth step, if the difference rDvtIs not greater than a set value rDvtMaxJudging whether the difference is less than a set value rDvtMin？
The fifth step, if the difference rDvtIs less than a set value rDvtMinThen, the actual opening r of the EGR valve is judgedActWhether or not it is greater than a set value rOpen. If greater than the set point, the EGR valve is stuck in an open state. If not, the actual opening r of the EGR valve is judgedActWhether or not it is less than a set value rClsd. If less than the set point, the EGR valve is stuck in a closed state. Otherwise, the EGR valve is stuck in a neutral position.
Sixthly, calculating the actual exhaust gas flow m under the working conditionEGRActAnd target exhaust gas flow rate mEGRDesDifference m ofEGRDvtWhen the difference m isEGRDvtGreater than a set value mEGRDvtMaxAnd if so, reporting the fault of high flow of the EGR valve. Wherein the actual exhaust gas flow mEGRActAnd calculating to obtain the target product. Target exhaust gas flow mEGRDesAnd obtaining the actual fuel injection quantity according to the engine rotating speed under the working condition through table look-up. Set value mEGRDvtMaxAnd obtaining an allowable deviation range by looking up a table according to the engine speed and the actual fuel injection quantity under the working condition.
Step seven, if the difference mEGRDvtIs not more than a set value mEGRDvtMaxJudging whether the value is less than a set value mEGRDvtMinIf the difference m isEGRDvtLess than a set value mEGRDvtMinAnd reporting the fault that the flow of the EGR valve is low.
And eighthly, if the difference values are in a normal range, the EGR valve system has no fault.
Therefore, the opening degree of the EGR valve is controlled based on the fresh air intake quantity, PID control is carried out through the difference value of the fresh air intake quantity required by combustion and the actual fresh air intake quantity under each working condition to obtain the target opening degree of the EGR valve, and PID control is carried out through the difference value of the actual opening degree and the target opening degree of the EGR valve measured by the EGR valve position sensor to obtain the duty ratio of the EGR valve control which is finally output. And the fresh air intake quantity and the EGR rate under each working condition are accurately controlled by two PID controllers. When the target fresh air amount is calculated, a mode of combining a static model and a dynamic model is adopted for calculation, and the control requirement of the engine under each working condition is met.
The controller is the elements and algorithm steps of each example described in connection with the embodiments disclosed herein and can be embodied in electronic hardware, computer software, or combinations of both, and the components and steps of each example have been described above generally in terms of their functionality in order to clearly illustrate the 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 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 (9)
1. A control and diagnostic mechanism for an EGR system, comprising: an atmospheric pressure sensor, a coolant temperature sensor, an air flow sensor, an intake air temperature pressure sensor, an EGR valve, a position sensor, and a controller;
the atmospheric pressure sensor is used for measuring atmospheric pressure in the current environment and transmitting detected atmospheric pressure data to the controller;
the cooling liquid temperature sensor is arranged on the engine cooling pipeline and used for measuring the temperature of the engine cooling liquid and transmitting the detected temperature data to the controller;
the air flow sensor is arranged on a pipeline in front of the mixed gas of the supercharger and the intercooler and used for measuring the air inflow of the fresh air and transmitting the detected data of the air inflow of the fresh air to the controller;
the air inlet temperature and pressure sensor is arranged on a pipeline behind the mixed gas and used for measuring the temperature and the pressure of the mixed gas and transmitting the detected temperature and pressure data of the mixed gas to the controller to calculate the flow of the mixed gas;
the EGR valve is arranged on a pipeline between an air inlet pipe and an exhaust pipe of the engine and used for controlling the flow of exhaust gas entering an engine cylinder;
a position sensor is integrated with the EGR valve for measuring an actual opening of the EGR valve and transmitting actual opening data to the controller.
2. The control and diagnostic mechanism for an EGR system according to claim 1,
the controller controls the intake air amount to the engine cylinder such that the intake air amount to the engine cylinder is equal to the sum of the fresh air intake air amount and the amount of exhaust gas to the cylinder through the EGR valve.
3. The control and diagnostic mechanism of an EGR system according to claim 1 or 2,
the controller acquires temperature and pressure through an air inlet temperature and pressure sensor; the controller calculates the intake air amount by the following formula:
wherein: n is engine speed, V is cylinder volume, PIntkFacVolEff is the coefficient of charge of the cylinder, T, for intake pressureIntkTo the inlet air temperature, KCorAre coefficients.
4. The control and diagnostic mechanism of an EGR system according to claim 1 or 2,
controller through
mEGR＝mMixing-mFresh air
Acquiring the flow rate of exhaust gas entering a cylinder from an EGR valve;
by passing
Obtaining an EGR rate;
the controller controls the opening degree and the EGR rate of the EGR valve through the fresh air intake amount;
when the deviation between the obtained exhaust gas flow rate and the target exhaust gas flow rate exceeds a set value, it is determined that the EGR valve has a failure.
5. The control and diagnostic mechanism of an EGR system according to claim 1 or 2,
the controller acquires the actual opening degree of the EGR valve through the position sensor, and determines that the EGR valve has a fault when the deviation of the actual opening degree and the preset opening degree exceeds a set value.
6. A heavy vehicle, comprising; control and diagnostic mechanism for an EGR system according to any of claims 1 to 5.
7. A control and diagnostic method for an EGR system according to any of claims 1-5, characterized in that the method comprises:
step one, judging whether an EGR valve is in a closed-loop control state or not;
second, actual opening r of the EGR valve measured by the position sensorActWith a target opening rDesIs a difference r ofDvtJudging whether the difference value is larger than a set value rDvtMax；
Third step, if said difference rDvtGreater than a set value rDvtMaxThen, the actual opening r of the EGR valve is judgedActWhether or not it is larger than a set value rOpen；
If the EGR valve is larger than the set value, the EGR valve is clamped in an opening state;
if not, the actual opening r of the EGR valve is judgedActWhether or not it is less than a set value rClsd；
If the EGR valve is smaller than the set value, the EGR valve is clamped in a closed state;
otherwise, the EGR valve is clamped at the middle position;
step four, if the difference rDvtIs not greater than a set value rDvtMaxJudging whether the difference is less than a set value rDvtMin；
Step five, if the difference rDvtIs less than a set value rDvtMinThen, the actual opening r of the EGR valve is judgedActWhether or not it is larger than a set value rOpen；
If the EGR valve is larger than the set value, the EGR valve is clamped in an opening state;
if not, the actual opening r of the EGR valve is judgedActWhether or not it is less than a predetermined value rClsd；
If the EGR valve is smaller than the set value, the EGR valve is clamped in a closed state;
otherwise, the EGR valve is clamped at the middle position;
sixthly, judging the current actual exhaust gas flow mEGRActAnd target exhaust gas flow rate mEGRDesDifference m ofEGRDvt；
When the difference m isEGRDvtGreater than a set value mEGRDvtMaxAnd if so, reporting the fault of high flow of the EGR valve.
8. The control and diagnostic method of the EGR system according to claim 7,
if the difference m isEGRDvtIs not more than a set value mEGRDvtMaxJudging whether the value is less than a set value mEGRDvtMinIf the difference m isEGRDvtLess than a set value mEGRDvtMinAnd reporting the fault that the flow of the EGR valve is low.
9. The control and diagnostic method of an EGR system according to claim 8,
if the difference r isDvtAnd the difference mEGRDvtAre within the preset range, the EGR valve is not malfunctioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010585917.8A CN111736456B (en) | 2020-06-24 | 2020-06-24 | Control and diagnostic mechanism for EGR system, heavy duty car and method |
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| CN202010585917.8A CN111736456B (en) | 2020-06-24 | 2020-06-24 | Control and diagnostic mechanism for EGR system, heavy duty car and method |
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| CN111736456A true CN111736456A (en) | 2020-10-02 |
| CN111736456B CN111736456B (en) | 2024-01-23 |
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| CN111622853A (en) * | 2020-05-29 | 2020-09-04 | 一汽解放汽车有限公司 | Self-adaptive EGR control method based on engine nitrogen and oxygen emission |
| CN112485010A (en) * | 2020-11-30 | 2021-03-12 | 潍柴动力股份有限公司 | Method and system for detecting response state of engine electric control actuator |
| CN112682190A (en) * | 2020-12-25 | 2021-04-20 | 潍柴动力股份有限公司 | Method, device and equipment for controlling opening of EGR valve |
| CN113219938A (en) * | 2021-04-07 | 2021-08-06 | 联合汽车电子有限公司 | Flow diagnosis method and system for low-pressure EGR (exhaust gas Recirculation) system of gasoline engine and readable storage medium |
| CN113958431A (en) * | 2021-09-24 | 2022-01-21 | 东风商用车有限公司 | Diagnosis method for engine EGR flow abnormity |
| CN114233486A (en) * | 2021-11-12 | 2022-03-25 | 潍柴动力股份有限公司 | Control method and device of EGR valve and ECU |
| CN114253123A (en) * | 2021-11-29 | 2022-03-29 | 国家电网有限公司 | Main distribution feedback adjusting method of speed regulator |
| CN117418972A (en) * | 2023-12-19 | 2024-01-19 | 潍柴动力股份有限公司 | Fault detection method and control device for EGR (exhaust gas Recirculation) cooler |
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| CN111622853A (en) * | 2020-05-29 | 2020-09-04 | 一汽解放汽车有限公司 | Self-adaptive EGR control method based on engine nitrogen and oxygen emission |
| CN112485010A (en) * | 2020-11-30 | 2021-03-12 | 潍柴动力股份有限公司 | Method and system for detecting response state of engine electric control actuator |
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