CN111736456B - Control and diagnostic mechanism for EGR system, heavy duty car and method - Google Patents
Control and diagnostic mechanism for EGR system, heavy duty car and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000007246 mechanism Effects 0.000 title claims 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 description 2
- 238000003745 diagnosis Methods 0.000 abstract description 8
- 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
- 239000007789 gas Substances 0.000 description 35
- 238000010586 diagram Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- SAZUGELZHZOXHB-UHFFFAOYSA-N acecarbromal Chemical compound CCC(Br)(CC)C(=O)NC(=O)NC(C)=O SAZUGELZHZOXHB-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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; the coolant temperature sensor measures the temperature of the engine coolant; the air flow sensor measures the fresh air inflow; the air inlet temperature and pressure sensor calculates the flow of the mixed air; the EGR valve is used to control the flow of exhaust gas into the engine cylinders; the position sensor is integrated on the EGR valve for measuring the actual opening of the EGR valve. When the target fresh air quantity is calculated, a mode of combining a static model with a dynamic model is adopted for calculation, and the control requirement of the engine under each working condition is met. And the method adopts two modes of EGR exhaust gas flow deviation and EGR valve opening deviation to judge, so that faults such as low or high EGR valve flow, EGR valve clamping stagnation, slow EGR valve response and the like can be diagnosed, the fault diagnosis judgment of the EGR valve is more accurate, and the diagnosis requirements of user use and regulation are met.
Description
Technical Field
The present invention relates to the field of exhaust gas recirculation technology, and more particularly to a control and diagnostic mechanism for an EGR system, a heavy-duty car and a method.
Background
With the increasing stricter requirements of national regulations on the emission of heavy-duty car exhaust, the emission of car exhaust is called an important standard for measuring the quality of cars.
EGR (exhaust gas recirculation) is an important technology for reducing exhaust emissions from diesel engines, and it returns part of the exhaust gas discharged from the engine to the intake manifold, where it is mixed with fresh air and then re-enters the cylinders, so that the oxygen concentration and the maximum combustion temperature of the mixture in the cylinders are reduced, and thus the NOx production is reduced. Excessive amounts of exhaust gas, while reducing NOx emissions from the engine, increase particulate emissions and affect fuel consumption and power of the engine. The control of the amount of exhaust gases is thus an important requirement for the economy, the dynamics and the emissions of the engine.
When the EGR valve fails, the engine cannot work according to the set target, the dynamic property and the exhaust gas composition of the engine can be influenced, and the technical problem that how to realize the failure diagnosis of the EGR valve, ensure the economical efficiency and the dynamic property of the engine and meet the emission requirement is also currently in need of being solved urgently.
Disclosure of Invention
In order to overcome the above-described 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 the atmospheric pressure in the current environment and transmitting the detected atmospheric pressure data to the controller;
the cooling liquid temperature sensor is arranged on the engine cooling pipeline and is used for measuring the temperature of engine cooling liquid and transmitting 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 is used for measuring the fresh air inflow and transmitting detected fresh air inflow data to the controller;
the air inlet temperature and pressure sensor is arranged on a pipeline behind the mixed gas and is used for measuring the temperature and 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 is used for controlling the flow of exhaust gas entering an engine cylinder;
the position sensor is integrated on the EGR valve for measuring the actual opening of the EGR valve and transmitting the actual opening data to the controller.
It is further noted that the controller controls the intake air amount of the engine cylinder so that the intake air amount into the engine cylinder is equal to the sum of the fresh air intake air amount and the amount of exhaust gas entering the cylinder through the EGR valve.
It should be 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 the engine speed, V is the cylinder volume, P Intk For intake pressure, facVolEff is the cylinder charge coefficient, T Intk K is the intake temperature Cor Is a coefficient.
It should be further noted that the controller is configured to control the operation of the controller by
m EGR ＝m Mixing -m Fresh air
Acquiring the flow of exhaust gas entering a cylinder from an EGR valve;
by passing throughAcquiring an EGR rate;
the controller controls the opening degree and the EGR rate of the EGR valve through the fresh air inflow;
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 is faulty.
The controller obtains the actual opening of the EGR valve by the position sensor, and determines that the EGR valve is defective when the deviation between the actual opening and the preset opening exceeds a set value.
The invention also provides a heavy-duty car, comprising; control and diagnostic mechanisms for an EGR system.
The invention also provides a control and diagnosis method of the EGR system, which comprises the following steps:
the method comprises the steps of firstly, judging whether an EGR valve is in a closed-loop control state or not;
second, the actual opening r of the EGR valve measured by the position sensor Act And the target opening degree r Des Is the difference r of (2) Dvt Judging whether the difference is larger than a set value r DvtMax ；
Third, if the difference r Dvt Is greater than the set value r DvtMax Then the actual opening r of the EGR valve is judged Act Whether or not it is greater than the set value r Open ；
If the set value is larger than the set value, the EGR valve is blocked in an open state;
if not greater than the set value, judging the actual opening r of the EGR valve Act Whether or not it is smaller than the set value r Clsd ；
If the set value is smaller than the set value, the EGR valve is blocked in a closed state;
otherwise, the EGR valve is blocked in the middle position;
fourth, if the difference r Dvt Not greater than the set value r DvtMax Judging whether the difference is smaller than a set value r DvtMin ；
Fifth step, if the difference r Dvt Less than the set value r DvtMin Then the actual opening r of the EGR valve is judged Act Whether or not it is greater than the set value r Open ；
If the set value is larger than the set value, the EGR valve is blocked in an open state;
if not greater than the set value, judging the actual opening r of the EGR valve Act Whether or not it is smaller than a preset value r Clsd ；
If the set value is smaller than the set value, the EGR valve is blocked in a closed state;
otherwise, the EGR valve is blocked in the middle position;
sixth, judging the current actual exhaust gas flow m EGRAct And the target exhaust gas flow m EGRDes Is the difference m between (2) EGRDvt ；
When the difference value m EGRDvt Greater than the set value m EGRDvtMax And when the flow rate of the EGR valve is high, a fault is reported.
If the difference value m EGRDvt Not greater than the set value m EGRDvtMax Judging whether the value is smaller than the set value m EGRDvtMin If the difference value m EGRDvt Less than the set value m EGRDvtMin And a fault that the flow rate of the EGR valve is low is reported.
If the difference r Dvt Sum-difference value m EGRDvt Is within the preset range, the EGR valve is free of faults.
From the above technical scheme, the invention has the following advantages:
the invention controls the opening of the EGR valve based on the fresh air inflow, carries out PID control through the difference value between the fresh air inflow required by combustion under each working condition and the actual fresh air inflow to obtain the target opening of the EGR valve, and carries out PID control through the difference value between the actual opening of the EGR valve measured by an EGR valve position sensor and the target opening to obtain the duty ratio of the final output EGR valve control. The fresh air inflow and the EGR rate under each working condition are accurately controlled by two PID controllers. When the target fresh air quantity is calculated, a mode of combining a static model with a dynamic model is adopted for calculation, and the control requirement of the engine under each working condition is met. And the method adopts two modes of EGR exhaust gas flow deviation and EGR valve opening deviation to judge, so that faults such as low or high EGR valve flow, EGR valve clamping stagnation, slow EGR valve response and the like can be diagnosed, the fault diagnosis judgment of the EGR valve is more accurate, and the diagnosis requirements of user use and regulation are met.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a control and diagnostic mechanism of an EGR system;
FIG. 2 is a control logic block diagram of an embodiment of the present invention;
FIG. 3 is a schematic diagram of a dynamic model of the target intake air amount;
FIG. 4 is a control logic block diagram of 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 described in connection with the embodiments disclosed herein may be embodied in electronic hardware, in computer software, or in a combination of the two, and that the elements and steps of the examples have been generally described in terms of function in the foregoing description 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 solution. 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 depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
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 give 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, etc. In other instances, well-known methods, devices, implementations, or operations are not 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 the atmospheric pressure in the current environment and transmitting the detected atmospheric pressure data to the controller; the cooling liquid temperature sensor is arranged on the engine cooling pipeline and is used for measuring the temperature of engine cooling liquid and transmitting 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 is used for measuring the fresh air inflow and transmitting detected fresh air inflow data to the controller; the air inlet temperature and pressure sensor 4 is arranged on a pipeline behind the mixed gas and is used for measuring the temperature and 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 is used for controlling the flow of exhaust gas entering an engine cylinder; the position sensor is integrated on the EGR valve 6 for measuring the actual opening of the EGR valve and transmitting the actual opening 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 backflow.
In the present invention, the amount of intake air into the engine cylinder 5 is equal to the sum of the amount of fresh air intake and the amount of exhaust gas into the cylinder through the EGR valve.
m Mixing ＝m Fresh air +m EGR
The fresh air inflow can be directly measured by an air inflow sensor arranged in front of the mixed gas after the charge intercooler.
The amount of intake air after mixing can be calculated from the temperature and pressure of the mixture measured by an intake air temperature pressure sensor installed behind the mixture. The calculation formula from the ideal gas equation is as follows:
wherein: n is the engine speed, V is the cylinder volume, P Intk For intake pressure, facVolEff is the cylinder charge coefficient, T Intk K is the intake temperature Cor Is a coefficient.
The total volume of the cylinder is fixed, so that the fuel injection quantity is fixed and the air inflow entering the cylinder is fixed under a certain working condition. The more exhaust gas is admitted to the cylinder, the less fresh air is admitted, and the flow of exhaust gas through the EGR valve into the cylinder is:
m EGR ＝m mixing -m Fresh air
The EGR valve opening degree and the EGR rate can be controlled by the amount of fresh air intake.
When the deviation of the calculated exhaust gas flow rate and 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, that a malfunction occurs.
The EGR valve position sensor may feed back the actual opening degree of the EGR valve, and when the 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, that a malfunction has occurred.
The specific control logic of the invention is as follows:
as shown in the control logic diagram of FIG. 2, the present invention controls the opening of the EGR valve based on the fresh air intake amount by the fresh air intake amount m required for combustion under each condition Des And the actual fresh air intake amount m Act Is the difference m between (2) Dvt PID control is performed. According to the engine operation condition and m Dvt Different PID control parameters are adopted, and the response speed and the control precision are improved.
Calculating a target air inflow:
the calculation of the target intake air amount is realized by combining a static model and a dynamic model. The target air inflow required by the engine under different working conditions is obtained through the calculated values of the two models, and the air inflow is used as a main basis for controlling the EGR valve.
Static model of target intake air amount:
the target intake air amount basic value is calculated based on the engine speed and the oil amount. Since the engine demand intake air amount is different under different environmental conditions such as low temperature, high temperature and high altitude, the basic values are corrected using the coolant temperature, intake air temperature and atmospheric pressure. In addition, in consideration of the coordinated control of the boost pressure and the EGR valve, the calculated value is corrected based on the boost pressure. 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 as 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.
The minimum target intake air amount may be calculated based on the minimum lambda value under a certain engine operating condition. Based on the minimum EGR rate, the maximum target intake air amount may be calculated. The dynamic value may be adjusted by a parameter based on different priorities for NOX and soot emission control.
PID control is performed through the difference value between the target fresh air intake amount and the actual fresh air intake amount, and the open-loop value of the EGR valve is obtained. And adding the open loop value to obtain the target opening degree of the EGR valve.
And the monitoring function takes a default value for the target opening of the EGR valve under certain special working conditions and when the EGR valve fails. For example, the EGR valve may be fully closed when it fails.
Calculating a target opening degree open loop value of the EGR valve:
and calculating a basic value of the open-loop opening degree of the EGR valve based on the engine speed and the oil mass, and correcting the value by using the temperature of the cooling liquid, the temperature of the intake air and the atmospheric pressure, so that the EGR valve is controlled to be at a proper opening degree in the high-temperature and low-temperature plateau areas. The final opening calculation value limit is between the maximum opening and the minimum opening.
As shown in the control logic diagram of fig. 4, the control of the EGR valve makes the actual opening r of the EGR valve by creating a closed-loop controller model Act Reaching the target opening degree r Des . Wherein the actual opening r of the EGR valve Act Measured by a position sensor mounted on the EGR valve. According to the running condition of the engine and the deviation r of the actual opening degree and the target opening degree Dvt Different PID control parameters are adopted, and the response speed and the control precision are improved. The control value of the EGR valve is converted to the duty ratio by the conversion curve.
The present invention also provides a heavy-duty car based on the control and diagnostic mechanism of the EGR system described above, comprising; control and diagnostic mechanisms for an EGR system. Heavy-duty automobiles may be trucks, trailers, and construction machinery.
The present invention also provides a control and diagnostic method of an EGR system, as shown in fig. 5, the method comprising:
first, it is determined whether the EGR valve is in a closed-loop control state. The diagnosis is performed only in a closed-loop control state.
Second, calculating the actual opening r of the EGR valve measured by the EGR valve position sensor under the working condition Act And the target opening degree r Des Is the difference r of (2) Dvt Judging whether the difference is larger than the set value r DvtMax ? Wherein the actual opening degree r Act Measured by an EGR valve position sensor. Target opening r Des Obtained by closed loop control of the EGR valve.
Third, if the difference r Dvt Is greater than the set value r DvtMax Then the actual opening r of the EGR valve is judged Act Whether or not it is greater than the set value r Open . If it is larger than the set value, the EGR valve is stuck in the open state. If not greater than the set value, determining the actual opening r of the EGR valve Act Whether or not it is smaller than the set value r Clsd . If it is smaller than the set value, the EGR valve is stuck in the closed state. Otherwise, the EGR valve is stuck in the neutral position.
Fourth, if the difference r Dvt Not greater than the set value r DvtMax Judging whether the difference is smaller than the set value r DvtMin ？
Fifth step, if the difference r Dvt Less than the set value r DvtMin Then the actual opening r of the EGR valve is judged Act Whether or not it is greater than a certain set value r Open . If it is larger than the set value, the EGR valve is stuck in the open state. If not greater than the set value, determining the actual opening r of the EGR valve Act Whether or not it is smaller than a certain set value r Clsd . If it is smaller than the set value, the EGR valve is stuck in the closed state. Otherwise, the EGR valve is stuck in the neutral position.
Step six, calculating the actual waste under the working conditionAir flow m EGRAct And the target exhaust gas flow m EGRDes Is the difference m between (2) EGRDvt When the difference value m EGRDvt Greater than the set value m EGRDvtMax And when the flow rate of the EGR valve is high, a fault is reported. Wherein the actual exhaust gas flow rate m EGRAct Is obtained through calculation. Target exhaust gas flow rate m EGRDes And obtaining through table lookup according to the engine speed and the actual fuel injection quantity under the working condition. Set value m EGRDvtMax And obtaining an allowable deviation range through table lookup according to the engine speed and the actual fuel injection quantity under the working condition.
Seventh, if the difference value m EGRDvt Not greater than the set value m EGRDvtMax Judging whether the value is smaller than the set value m EGRDvtMin If the difference value m EGRDvt Less than the set value m EGRDvtMin And a fault that the flow rate of the EGR valve is low is reported.
Eighth, if the above differences are all within the normal range, the EGR valve system is free of faults.
In this way, the opening degree of the EGR valve is controlled based on the fresh air intake amount, PID control is performed by the difference between the fresh air intake amount required for combustion and the actual fresh air intake amount under each working condition to obtain the target opening degree of the EGR valve, and PID control is performed by the difference between the actual opening degree of the EGR valve measured by the EGR valve position sensor and the target opening degree to obtain the duty ratio of the final output EGR valve control. The fresh air inflow and the EGR rate under each working condition are accurately controlled by two PID controllers. When the target fresh air quantity is calculated, a mode of combining a static model with a dynamic model is adopted for calculation, and the control requirement of the engine under each working condition is met.
The controller is the unit and algorithm steps of the examples described in connection with the embodiments disclosed herein, and can be embodied in electronic hardware, computer software, or a combination of the two, and to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described generally in terms of functionality in the foregoing description. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. 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 (4)
1. A control and diagnostic method of an EGR system, characterized in that the method employs a control and diagnostic mechanism of the EGR system; the control and diagnostic mechanism of the EGR system includes: 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 the atmospheric pressure in the current environment and transmitting the detected atmospheric pressure data to the controller;
the cooling liquid temperature sensor is arranged on the engine cooling pipeline and is used for measuring the temperature of engine cooling liquid and transmitting 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 is used for measuring the fresh air inflow and transmitting detected fresh air inflow data to the controller;
the air inlet temperature and pressure sensor is arranged on a pipeline behind the mixed gas and is used for measuring the temperature and 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 is used for controlling the flow of exhaust gas entering an engine cylinder;
the position sensor is integrated on the EGR valve and is used for measuring the actual opening of the EGR valve and transmitting the actual opening data to the controller;
the controller obtains 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 the engine speed, V is the cylinder volume, P Intk For intake pressure, facVolEff is the cylinder charge coefficient, T Intk K is the intake temperature Cor Is a coefficient;
the controller passes through
m EGR =m Mixing - m Fresh air
Acquiring the flow of exhaust gas entering a cylinder from an EGR valve;
by passing throughAcquiring an EGR rate;
the controller controls the opening degree and the EGR rate of the EGR valve through the fresh air inflow;
when the deviation between the obtained exhaust gas flow and the target exhaust gas flow exceeds a set value, judging that the EGR valve is faulty;
the method comprises the following steps:
the method comprises the steps of firstly, judging whether an EGR valve is in a closed-loop control state or not;
second, the actual opening r of the EGR valve measured by the position sensor Act And the target opening degree r Des Is the difference r of (2) Dvt Judging whether the difference is larger than a set value r DvtMax ；
Third, if the difference r Dvt Is greater than the set value r DvtMax Then the actual opening r of the EGR valve is judged Act Whether or not it is greater than the set value r Open ；
If the set value is larger than the set value, the EGR valve is blocked in an open state;
if not greater than the set value, judging the actual opening r of the EGR valve Act Whether or not it is smaller than the set value r Clsd ；
If the set value is smaller than the set value, the EGR valve is blocked in a closed state;
otherwise, the EGR valve is blocked in the middle position;
fourth, if the difference r Dvt Not greater than the set value r DvtMax Judging whether the difference is smaller than a set value r DvtMin ；
Fifth step, if the difference r Dvt Less than the set value r DvtMin Then the actual opening r of the EGR valve is judged Act Whether or not it is greater than the set value r Open ；
If the set value is larger than the set value, the EGR valve is blocked in an open state;
if not greater than the set value, judging the actual opening r of the EGR valve Act Whether or not it is smaller than a preset value r Clsd ；
If the set value is smaller than the set value, the EGR valve is blocked in a closed state;
otherwise, the EGR valve is blocked in the middle position;
sixth, judging the current actual exhaust gas flow m EGRAct And the target exhaust gas flow m EGRDes Is the difference m between (2) EGRDvt ；
When the difference value m EGRDvt Greater than the set value m EGRDvtMax When the flow rate of the EGR valve is high, a fault of high flow rate of the EGR valve is reported;
if the difference value m EGRDvt Not greater than the set value m EGRDvtMax Judging whether the value is smaller than the set value m EGRDvtMin If the difference value m EGRDvt Less than the set value m EGRDvtMin And a fault that the flow rate of the EGR valve is low is reported.
2. The method for controlling and diagnosing an EGR system according to claim 1, wherein,
the controller controls the intake air amount of the engine cylinder so that the intake air amount entering the engine cylinder is equal to the sum of the fresh air intake air amount and the amount of exhaust gas entering the cylinder through the EGR valve; the atmospheric pressure sensor is used for measuring the atmospheric pressure in the current environment and transmitting detected atmospheric pressure data to the controller.
3. The method for controlling and diagnosing an EGR system according to claim 1, wherein,
the controller obtains the actual opening degree of the EGR valve through the position sensor, and determines that the EGR valve is faulty when the deviation between the actual opening degree and the preset opening degree exceeds a set value.
4. The method for controlling and diagnosing an EGR system according to claim 1, wherein,
if the difference r Dvt Sum-difference value m EGRDvt Is within the preset range, the EGR valve is free of faults.
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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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| CN111736456B true 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 |
| CN113219938B (en) * | 2021-04-07 | 2022-07-22 | 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 |
| CN114233486B (en) * | 2021-11-12 | 2023-08-18 | 潍柴动力股份有限公司 | Control method and device for 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 |
| CN117418972B (en) * | 2023-12-19 | 2024-04-16 | 潍柴动力股份有限公司 | Fault detection method and control device for EGR (exhaust gas Recirculation) cooler |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5092298A (en) * | 1990-05-09 | 1992-03-03 | Honda Giken Kogyo Kabushiki Kaisha | Fail-safe system for throttle valve controller |
| US5964820A (en) * | 1996-11-13 | 1999-10-12 | Nissan Motor Co., Ltd. | Diesel engine exhaust recirculating system diagnostic |
| EP1394400A1 (en) * | 2002-08-23 | 2004-03-03 | Toyota Jidosha Kabushiki Kaisha | Abnormality diagnosis device and abnormality diagnosis method for exhaust gas recirculation unit |
| DE10332698A1 (en) * | 2002-09-25 | 2004-04-08 | Robert Bosch Gmbh | Regulation method for exhaust gas recirculation in a combustion engine in which corrections and adjustments are made based on temperature and pressure measurements in the charge after exhaust and fresh air have been combined |
| JP2006177257A (en) * | 2004-12-22 | 2006-07-06 | Fujitsu Ten Ltd | Control device for internal combustion engine |
| JP2008223516A (en) * | 2007-03-09 | 2008-09-25 | Mazda Motor Corp | Failure diagnosis device of exhaust gas recirculation device for engine |
| CN101289965A (en) * | 2006-12-27 | 2008-10-22 | 通用汽车环球科技运作公司 | Waste gas recirculation estimation system |
| CN103016184A (en) * | 2012-11-07 | 2013-04-03 | 南岳电控(衡阳)工业技术有限公司 | Method and device for monitoring NOx emission capacity of electric control diesel engine EGR (Exhaust Gas Recirculation) system |
| CN104500281A (en) * | 2014-11-12 | 2015-04-08 | 中国重汽集团济南动力有限公司 | Internal combustion engine exhaust gas recirculation closed-loop control system and method |
| CN105464820A (en) * | 2014-07-07 | 2016-04-06 | 博世汽车柴油系统有限公司 | Engine air inlet metering unit and engine system |
| CN105829687A (en) * | 2013-12-20 | 2016-08-03 | 丰田自动车株式会社 | EGR system for supercharging engine |
| CN109139307A (en) * | 2018-09-29 | 2019-01-04 | 汽解放汽车有限公司 | A kind of EGR valve flow diagnostic method |
| CN109268158A (en) * | 2018-09-27 | 2019-01-25 | 安徽江淮汽车集团股份有限公司 | A kind of modified method and system of air input of engine by air |
| CN109469567A (en) * | 2018-09-29 | 2019-03-15 | 汽解放汽车有限公司 | A kind of EGR valve and throttle valve coupling control method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004100517A (en) * | 2002-09-06 | 2004-04-02 | Mitsubishi Fuso Truck & Bus Corp | Failure detector of internal combustion engine |
| KR101509889B1 (en) * | 2013-06-17 | 2015-04-07 | 현대자동차주식회사 | Method for monitoring egr system and method for controlling fuel injection by method for monitoring egr system |
| JP6405405B1 (en) * | 2017-03-30 | 2018-10-17 | 株式会社Ｓｕｂａｒｕ | EGR abnormality detection device |
-
2020
- 2020-06-24 CN CN202010585917.8A patent/CN111736456B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5092298A (en) * | 1990-05-09 | 1992-03-03 | Honda Giken Kogyo Kabushiki Kaisha | Fail-safe system for throttle valve controller |
| US5964820A (en) * | 1996-11-13 | 1999-10-12 | Nissan Motor Co., Ltd. | Diesel engine exhaust recirculating system diagnostic |
| EP1394400A1 (en) * | 2002-08-23 | 2004-03-03 | Toyota Jidosha Kabushiki Kaisha | Abnormality diagnosis device and abnormality diagnosis method for exhaust gas recirculation unit |
| DE10332698A1 (en) * | 2002-09-25 | 2004-04-08 | Robert Bosch Gmbh | Regulation method for exhaust gas recirculation in a combustion engine in which corrections and adjustments are made based on temperature and pressure measurements in the charge after exhaust and fresh air have been combined |
| JP2006177257A (en) * | 2004-12-22 | 2006-07-06 | Fujitsu Ten Ltd | Control device for internal combustion engine |
| CN101289965A (en) * | 2006-12-27 | 2008-10-22 | 通用汽车环球科技运作公司 | Waste gas recirculation estimation system |
| JP2008223516A (en) * | 2007-03-09 | 2008-09-25 | Mazda Motor Corp | Failure diagnosis device of exhaust gas recirculation device for engine |
| CN103016184A (en) * | 2012-11-07 | 2013-04-03 | 南岳电控(衡阳)工业技术有限公司 | Method and device for monitoring NOx emission capacity of electric control diesel engine EGR (Exhaust Gas Recirculation) system |
| CN105829687A (en) * | 2013-12-20 | 2016-08-03 | 丰田自动车株式会社 | EGR system for supercharging engine |
| CN105464820A (en) * | 2014-07-07 | 2016-04-06 | 博世汽车柴油系统有限公司 | Engine air inlet metering unit and engine system |
| CN104500281A (en) * | 2014-11-12 | 2015-04-08 | 中国重汽集团济南动力有限公司 | Internal combustion engine exhaust gas recirculation closed-loop control system and method |
| CN109268158A (en) * | 2018-09-27 | 2019-01-25 | 安徽江淮汽车集团股份有限公司 | A kind of modified method and system of air input of engine by air |
| CN109139307A (en) * | 2018-09-29 | 2019-01-04 | 汽解放汽车有限公司 | A kind of EGR valve flow diagnostic method |
| CN109469567A (en) * | 2018-09-29 | 2019-03-15 | 汽解放汽车有限公司 | A kind of EGR valve and throttle valve coupling control method |
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