CN110714822A - Control method and control system for DPF regeneration - Google Patents
Control method and control system for DPF regeneration Download PDFInfo
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- CN110714822A CN110714822A CN201911148846.9A CN201911148846A CN110714822A CN 110714822 A CN110714822 A CN 110714822A CN 201911148846 A CN201911148846 A CN 201911148846A CN 110714822 A CN110714822 A CN 110714822A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention discloses a control method and a control system for DPF regeneration, wherein in a processing period, a detection value of a DPF regeneration related parameter is obtained, the detection value is corrected based on ambient humidity, temperature and pressure to obtain a first parameter, the product of a regeneration trigger threshold and a DPF aging factor is compared with the first parameter, whether a DPF regeneration trigger condition is met is judged based on the comparison result, and if so, DPF regeneration is carried out. Therefore, the technical scheme of the invention can correct the DPF regeneration triggering condition calculation in real time in a complex environment and after aftertreatment aging, efficiently control DPF regeneration, accurately judge DPF regeneration in the complex environment, avoid the problem of DPF burnout and improve the DPF regeneration efficiency.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to a control method and a control system for DPF regeneration.
Background
The diesel engine brings convenience to people and also brings serious environmental pollution problems. In order to deal with the problem of environmental pollution, increasingly strict motor vehicle emission regulations are developed in various countries, so that the particulate matter post-treatment technology becomes an important technical means for controlling the emission of diesel engines. Currently, Diesel Particulate traps (DPFs) are considered to be the most effective means of solving the problem of Diesel Particulate emissions, primarily by filtering and trapping particulates in the Diesel exhaust through diffusion, deposition and impaction mechanisms.
However, during the filtering and trapping process, as the particulate matter continues to accumulate in the DPF, the exhaust back pressure of the diesel engine rises, resulting in deterioration of the diesel engine performance. Therefore, it is necessary to periodically remove the particulate matter in the DPF to restore the DPF to an initial state and regenerate the DPF. In the DPF regeneration control method in the prior art, the DPF regeneration is difficult to accurately judge in a complex environment, and the DPF is easy to burn out.
Disclosure of Invention
In view of this, the technical solution of the present invention provides a control method and a control system for DPF regeneration, and the solution is as follows:
a method of controlling DPF regeneration, comprising:
acquiring a detected value of a DPF regeneration related parameter in one processing period;
correcting the detection value based on the environment humidity, the temperature and the pressure to obtain a first parameter;
comparing a product of a regeneration trigger threshold and a preset DPF aging correction factor with the first parameter;
judging whether DPF regeneration triggering conditions are met or not based on the comparison result;
if so, DPF regeneration is performed.
Preferably, in the control method, the method of calculating the DPF aging correction factor includes:
calculating a post-treatment correction factor based on an efficiency factor of the ash content, a rapid aging factor of the post-treatment temperature and a life factor of the post-treatment operation time;
and integrating the post-processing correction factor to obtain the DPF aging correction factor.
Preferably, in the control method, the aftertreatment correction factor is a product of the efficiency factor, the rapid aging factor, and the lifetime factor.
Preferably, in the control method, the method of acquiring the DPF regeneration-related parameter includes:
triggering a timer to start timing at the starting time of the processing period, and calculating the detection value of the related parameter;
in the same processing period, after the timer starts timing, each time the power is off, the detection value is stored in the ECU, and after the power is on again, the detection value read from the ECU is started to calculate the detection value of the relevant parameter.
Preferably, in the control method, after the DPF regeneration in one of the processing cycles is successful, the detection value stored in the ECU is cleared, and the control process of the DPF regeneration in the next processing cycle is started.
Preferably, in the control method, the first parameter is a product of the detection value and an ambient humidity correction factor and an ambient temperature and pressure correction factor.
Preferably, in the control method, the method of calculating the ambient humidity correction factor includes:
and acquiring the environment humidity correction factor under the current environment humidity based on the functional relation between the environment humidity correction factor and the environment humidity.
Preferably, in the control method, the method for calculating the ambient temperature and pressure correction factor includes:
and acquiring the ambient temperature and pressure correction factors under the current ambient temperature and pressure based on the functional relationship between the ambient temperature and pressure correction factors and the current ambient temperature and pressure.
Preferably, in the above control method, the relevant parameters include: at least one of an operating time, an operating oil consumption, and an operating mileage of the engine; the regeneration trigger threshold includes: a regeneration triggering time threshold corresponding to the running time, a regeneration triggering oil consumption threshold corresponding to the running oil consumption and a regeneration triggering mileage threshold corresponding to the running mileage;
the method of comparing the product of the regeneration trigger threshold and the pre-set DPF aging correction factor to the first parameter comprises:
comparing the product of the regeneration trigger time threshold and the DPF aging correction factor to a first parameter of the runtime if the parameter of interest comprises the runtime; if the first parameter of the running time is not less than the product corresponding to the first parameter, the DPF regeneration triggering condition is met;
comparing a product of the regeneration trigger oil consumption threshold and the DPF aging correction factor to a first parameter of the operating oil consumption if the related parameter comprises the operating oil consumption; if the first parameter of the operating oil consumption is not less than the product corresponding to the first parameter, the DPF regeneration triggering condition is met;
comparing a product of the regeneration trigger mileage threshold and the DPF aging correction factor to a first parameter of the operating mileage if the related parameter includes the operating mileage; and if the first parameter of the operating mileage is not less than the product corresponding to the first parameter, the DPF regeneration triggering condition is met.
The invention also provides a control system for DPF regeneration, which comprises:
the acquisition module is used for acquiring a detection value of the DPF regeneration related parameter in one processing period;
the correction module is used for correcting the detection value based on the environment humidity, the temperature and the pressure to obtain a first parameter;
the comparison module is used for comparing the product of a regeneration trigger threshold and a preset DPF aging correction factor with the first parameter;
the judging module is used for judging whether DPF regeneration triggering conditions are met or not based on the comparison result;
and the control module is used for carrying out DPF regeneration control if the DPF regeneration triggering condition is met.
As can be seen from the above description, in the DPF regeneration control method and the DPF regeneration control system according to the present invention, in one processing cycle, a detection value of a DPF regeneration related parameter is obtained, the detection value is corrected based on ambient humidity, temperature, and pressure to obtain a first parameter, a product of a regeneration trigger threshold and a DPF aging factor is compared with the first parameter, whether a DPF regeneration trigger condition is satisfied is determined based on a comparison result, and if so, DPF regeneration is performed. Therefore, the technical scheme of the invention can correct the DPF regeneration triggering condition calculation in real time in a complex environment and after aftertreatment aging, efficiently control DPF regeneration, accurately judge DPF regeneration in the complex environment, avoid the problem of DPF burnout and improve the DPF regeneration efficiency.
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 described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of an engine;
FIG. 2 is a schematic flow chart illustrating a DPF regeneration control method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a calculation of DPF aging correction factor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a DPF regeneration control method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a DPF regeneration control system according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an engine, intake air is measured and detected by an ambient temperature sensor 1, an ambient pressure sensor 2, an ambient humidity sensor 3 and a sensor 4 for measuring oxygen concentration of intake air of the engine, the intake air passes through an intercooler 5, then passes through an intake throttle valve TVA, and enters a diesel engine 6 for combustion, a part of exhaust gas after combustion passes through an exhaust gas recirculation control valve EGR, and then enters the diesel engine 6 through the throttle valve TVA for combustion, and the other part of exhaust gas is discharged through an HC nozzle 7, a DOC (diesel oxidation catalyst) device, a diesel particulate filter DPF and a selective catalytic reduction device SCR. The exhaust gas can also be used to drive the supercharger 8 to supercharge the intake air.
The DPF regeneration process comprises injecting diesel oil from HC nozzle 7 in aftertreatment, and injecting O in DOC2The reaction with diesel raises the temperature at the DPF inlet, and burns off the carbon particles in the DPF at a high temperature. In the prior art, the carbon loading amount of the DPF is generally confirmed based on the pressure difference between the inlet and the outlet of the DPF to carry out DPF regeneration control, but due to the influence of complex working condition environment and aftertreatment aging, the DPF regeneration can not be accurately judged. The amount of carbon carried by the DPF is the mass of soot particles inside the DPF. The post-treatment aging is a phenomenon in which the activity of the catalyst on the post-treatment surface is reduced by exposure to high temperature, ash adhesion, noble metal, and the like for a long period of time.
As described in the background art, the DPF regeneration control method in the prior art is difficult to accurately determine DPF regeneration in a complex environment, and thus, burning of the DPF is likely to occur. This is because in the prior art, only a single parameter is used for DPF regeneration determination, but when determining the DPF carbon loading amount change in a complex environment, the deviation of different environmental temperatures, humidity, pressure, etc. may affect the actual combustion of the engine, the calculation of the excess air coefficient, the calculation of the accuracy of the engine smoke intensity and the carbon loading amount model, and bring great difficulty to DPF regeneration triggering with the aging of post-processing. The existing carbon loading model is difficult to accurately judge DPF regeneration under complex working conditions and after aftertreatment aging, and the problem of burning-out of a DPF easily occurs.
In order to solve the above problems, embodiments of the present invention provide an efficient DPF regeneration control method and control system, which can correct DPF regeneration triggering calculation in real time in a complex environment and after aftertreatment aging, can accurately perform DPF regeneration judgment, avoid DPF burnout, and can efficiently control DPF regeneration to improve DPF regeneration efficiency. The technical scheme of the embodiment of the invention can improve the precision of the carbon-carrying quantity model, improve the fuel economy, improve the safety of post-treatment and prolong the service life of the engine and the post-treatment.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 2, fig. 2 is a schematic flowchart of a DPF regeneration control method according to an embodiment of the present invention, where the control method includes:
step S11: during one processing cycle, detected values of DPF regeneration-related parameters are acquired.
Step S12: and correcting the detection values based on the ambient humidity, the temperature and the pressure to obtain a first parameter.
Step S13: the product of the regeneration trigger threshold and a preset DPF aging correction factor is compared to the first parameter.
Step S14: and judging whether DPF regeneration triggering conditions are met or not based on the comparison result.
Step S15: if so, DPF regeneration is performed.
According to the control method provided by the embodiment of the invention, in the process of DPF regeneration control, real-time correction can be carried out on DPF regeneration trigger calculation under a complex environment and after aftertreatment aging, DPF regeneration judgment can be accurately carried out, the problem of DPF burnout is avoided, DPF regeneration can be efficiently controlled, and DPF regeneration efficiency is improved. The technical scheme of the embodiment of the invention can improve the precision of the carbon-carrying quantity model, improve the fuel economy, improve the safety of post-treatment and prolong the service life of the engine and the post-treatment.
The embodiment of the invention provides a calculation method of a DPF aging factor correction factor, which is used for calculating a post-treatment aging factor based on ash accumulation, post-treatment temperature and post-treatment operation time, and is shown in FIG. 3.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a principle of calculating a DPF aging correction factor according to an embodiment of the present invention, where the method for calculating the DPF aging correction factor includes: calculating a post-treatment correction factor based on an efficiency factor of the ash content, a rapid aging factor of the post-treatment temperature and a life factor of the post-treatment operation time; and integrating the post-processing correction factor to obtain the DPF aging correction factor.
As shown in fig. 3, the post-processing correction factor is the product of the efficiency factor, the fast aging factor, and the lifetime factor. The product of the three can be obtained by a multiplication circuit. The efficiency factor is calculated based on DPF ash content, the rapid aging factor is calculated based on aftertreatment temperature, and the life factor is calculated based on aftertreatment runtime.
In a laboratory environment, an air inlet air conditioner is installed on an engine, the ambient temperature is 25 ℃, the humidity of an air conditioner outlet is 45%, the pressure of the air conditioner outlet is 101KPa, and the conditions are engine operation standard conditions. In the DPF regeneration control in the prior art, the DPF regeneration triggering control is carried out in a standard condition running environment, and the influence of the complex environment for DPF regeneration on DPF related parameters in the actual running process cannot be represented.
The inventor researches and discovers that in the actual operation process of the engine, the ash content is corrected according to a coefficient from small to large, the more the ash content is, the larger the corresponding coefficient is, and the coefficient is the efficiency factor Y1With the amount of ash X1Has the following functional relationship:
Y1=A1X1 2+B1X1+C1（1）
wherein A is1、B1And C1Is a constant. The efficiency factors corresponding to different ash contents in the engine running process can be obtained in the engine running process or a computer model, and the efficiency factors are solved based on the equation system, so that A is determined1、B1And C1Further, the functional relationship (1) can be determined, and based on the determined functional relationship, the efficiency factor at an arbitrary ash content can be determined.
Meanwhile, the inventor also researches and discovers that in the actual running process of the engine, along with the rise of temperature, cracking is accelerated, the higher the temperature is, the larger the corresponding coefficient is, the coefficient is the rapid aging factor Y2With a post-treatment temperature X2Has the following functional relationship:
Y2=A2X2 2+B2X2+C2（2）
wherein A is2、B2And C2Is a constant. The rapid aging factors corresponding to different aftertreatment temperatures in the running process of the engine can be obtained in the running process of the engine or a computer model, and the solution is carried out on the basis of an equation set, so that A is determined2、B2And C2Further, the above functional relationship (2) can be determined, and based on the functional relationship, the rapid aging factor at an arbitrary post-processing temperature can be determined.
Furthermore, the inventor also researches and discovers that in the actual operation process of the engine, the longer the operation time is, the larger the corresponding coefficient is, namely the life factor Y3With running time X3Has the following functional relationship:
Y3= B3X3+C3（3）
wherein, B3And C3Is a constant. The service life factors corresponding to different running times in the running process of the engine can be obtained in the running process of the engine or a computer model, and the service life factors are solved based on the equation system, so that B is determined3And C3Further, the above-mentioned functional relationship (3) can be determined, and based on this functional relationship, the life factor at an arbitrary operation time can be determined.
As shown in fig. 3, the post-processing correction factor may be obtained based on a product of an efficiency factor, a fast aging factor, and a lifetime factor. The DPF aging correction factor may be obtained by integrating the post-processing correction factor by an integrator. The integrator performs integration processing when the Enable signal Enable drives the engine to be in an operating state. The integrator performs time integration based on the inputted post-processing correction factor, the outputted maximum guard value Max, the outputted minimum guard value Min, and the time derivative dt, thereby outputting the DPF aging correction factor.
As shown in fig. 4, the embodiment of the present invention provides a method for correcting a DPF carbon loading model based on ambient humidity, ambient temperature, and pressure, so as to ensure accurate determination of DPF regeneration triggering.
Optionally, the method for obtaining the DPF regeneration related parameter includes: and triggering a timer to start timing at the starting time of the processing period, and calculating the detection value of the related parameter. If the DPF is used for the first time, the first treatment period is used, and the time when the DPF is started to be used is the initial time of the treatment period. If successful DPF regeneration has occurred, a treatment cycle is completed, with the time of successful DPF regeneration in the previous treatment cycle being the start time of the next treatment cycle.
In the same processing period, after the timer starts timing, each time the power is off, the detection value is stored in the ECU, and after the power is on again, the detection value read from the ECU is started to calculate the detection value of the relevant parameter. When the DPF regeneration of one treatment period is successful, the detection value stored in the ECU is cleared, and the control process of the DPF regeneration of the next treatment period is started.
In an embodiment of the present invention, the first parameter is a product of the detection value and an ambient humidity correction factor, and an ambient temperature and pressure correction factor. And correcting the detection value through an environment humidity correction factor and an environment temperature and pressure correction factor so as to eliminate the influence of environment humidity, temperature and pressure, and taking the corrected detection value as the first parameter to accurately represent the detection value of the relevant parameter.
The calculation method of the environment humidity correction factor comprises the following steps: and acquiring the environment humidity correction factor under the current environment humidity based on the functional relation between the environment humidity correction factor and the environment humidity. The inventor researches and discovers that the environmental humidity correction factor Y4With the ambient humidity X4Has the following functional relationship:
Y4= A4X4+B4（4）
wherein A is4、B4Is a constant. The correction factors and the ambient humidity of different ambient humidity in the running process of the engine can be obtained in the running process of the engine or a computer model, and the solution is carried out based on an equation set, so that A is determined4、B4Further, the functional relationship (4) can be determined, and the ambient humidity correction factor at an arbitrary ambient humidity can be determined based on the determined functional relationship.
The method for calculating the correction factor of the environmental temperature and the pressure comprises the following steps: and acquiring the ambient temperature and pressure correction factors under the current ambient temperature and pressure based on the functional relationship between the ambient temperature and pressure correction factors and the ambient temperature and pressure. Meanwhile, the inventor researches and discovers that the ambient temperature and pressure correction factor Y5With ambient temperature X51And pressure X52Has the following functional relationship:
Y5= A51X51+B51+ A52X52+B52（5）
wherein A is51、B51、A52、B52Is a constant. The ambient temperature and pressure corresponding to different ambient temperatures and pressure correction factors in the running process of the engine can be obtained in the running process of the engine or a computer model, and the solution is carried out on the basis of an equation set, so that A is determined51、B51、A52、B524Further, the above-mentioned functional relationship (5), basis, can be determinedIn the functional relationship determined, ambient temperature and pressure correction factors for any ambient temperature and pressure can be determined.
It should be noted that the functional relationships (1) - (5) can be obtained by linear fitting of multiple sets of data, which is a conventional mathematical method and is not described in detail in the embodiments of the present invention.
In the control method according to the embodiment of the present invention, the relevant parameters include: at least one of an operating time, an operating oil consumption, and an operating mileage of the engine. The regeneration trigger threshold includes: the regeneration triggering time threshold corresponding to the running time, the regeneration triggering oil consumption threshold corresponding to the running oil consumption and the regeneration triggering mileage threshold corresponding to the running mileage. Each threshold may be set based on the required DPF triggering accuracy, and is not specifically limited in the embodiment of the present invention.
Optionally, in the control method, the method for comparing the product of the regeneration trigger threshold and the preset DPF aging correction factor with the first parameter includes:
comparing the product of the regeneration trigger time threshold and the DPF aging correction factor to a first parameter of the runtime if the parameter of interest comprises the runtime; if the first parameter of the running time is not less than the product corresponding to the first parameter, the DPF regeneration triggering condition is met;
comparing a product of the regeneration trigger oil consumption threshold and the DPF aging correction factor to a first parameter of the operating oil consumption if the related parameter comprises the operating oil consumption; if the first parameter of the operating oil consumption is not less than the product corresponding to the first parameter, the DPF regeneration triggering condition is met;
comparing a product of the regeneration trigger mileage threshold and the DPF aging correction factor to a first parameter of the operating mileage if the related parameter includes the operating mileage; and if the first parameter of the operating mileage is not less than the product corresponding to the first parameter, the DPF regeneration triggering condition is met.
The determination of the DPF trigger condition may be made as one or more of an operating time of the engine, an operating oil consumption amount, and an operating mileage. In the embodiment of the present invention, in order to trigger the DPF more accurately, setting the relevant parameters includes: the running time, the running oil consumption and the running mileage of the engine. At this time, if the first parameter of at least one of the operation time, the operation oil consumption amount, and the operation mileage is not less than the product corresponding thereto, the DPF regeneration triggering condition is satisfied, otherwise, the DPF regeneration triggering condition is not satisfied. That is, DPF regeneration may be triggered when any one of the operation time, the operation oil consumption amount, and the operation mileage satisfies a condition, and if none of the operation time, the operation oil consumption amount, and the operation mileage satisfies a condition, respective detection values are continuously obtained until one of the operation time, the operation oil consumption amount, and the operation mileage successfully triggers DPF regeneration.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a DPF regeneration control method according to an embodiment of the present invention, and in the embodiment illustrated in fig. 4, triggering of DPF regeneration is simultaneously performed based on engine running time, running oil consumption, and running mileage, and the control method according to the embodiment of the present invention is described below with reference to fig. 4.
The control method of the embodiment of the invention comprises the following three parallel processing branches:
1) based on the engine running time, if the DPF is used for the first time, the timer 11 is triggered to count time when the DPF starts to be used, and if the DPF regeneration is successful, the timer 11 is triggered to count time after the previous DPF regeneration is successful. After the timer 11 is triggered to count time, the running time may be accumulated based on a set step value, and the detection value may be obtained.
The controller 12 (e.g., ECU) acquires the timing result of the timer 11 and calculates the operating time from the previous successful DPF regeneration. The controller 12 performs data processing based on a preset calculation model. In the calculation process, each time the power is off, the controller 12 writes the calculation result into the ECU memory, and after the power is turned on next time, reads the data stored in the memory and continues the previous settlement process. The calculation result output by the controller 12 is corrected by the ambient humidity correction factor and the ambient temperature and pressure correction factor to obtain the corrected operating time from the last successful regeneration. The run time is compared to a product of a regeneration trigger time threshold and a DPF aging correction factor, and if the run time is greater than the product, a regeneration trigger request occurs. The product is calculated by a multiplication circuit 13 and a comparison of the product with the running time is performed by a comparison circuit 14.
2) Based on the engine running oil consumption, if the DPF is used for the first time, the timer 11 is triggered to time when the DPF is started to be used, and if the DPF regeneration is successful, the timer 11 is triggered to time after the previous DPF regeneration is successful.
The controller 12 acquires the timing result of the timer 11 and calculates the operating oil consumption from the previous DPF regeneration success. In the calculation process, each time the power is off, the controller writes the calculation result into the ECU memory, and after the power is on next time, the controller reads the data stored in the memory to continue the previous settlement process. The calculation result output by the controller 12 is corrected by the ambient humidity correction factor and the ambient temperature and pressure correction factor to obtain the corrected operating oil consumption from the last successful regeneration. The operating oil consumption is compared to a product of a regeneration trigger oil consumption threshold and a DPF aging correction factor, and if the operating time is greater than the product, a regeneration trigger request occurs.
3) Based on the engine running mileage, if the DPF is used for the first time, the timer 11 is triggered to count the time when the DPF starts to be used, and if the DPF regeneration is successful, the timer 11 is triggered to count the time after the previous DPF regeneration is successful.
For clarity of illustration, fig. 4 includes fig. 4a and fig. 4b, where the three controllers in fig. 4a each output signal A, B, C, corresponding to the input signals A, B, C of the three branches in fig. 4 b.
If the corresponding first parameter in the branch is not smaller than the corresponding product, the comparison circuit 14 outputs a digital signal of "1", otherwise "0". The output results of the comparison circuits 14 of the three parallel branches are processed by the same gate circuit 15, if the output result of any branch is '1', the triggering condition is met, and the gate circuit 15 outputs a triggering signal to perform regeneration triggering.
The controller 12 acquires the timing result of the timer 11 and calculates the operating mileage from the previous successful DPF regeneration. In the calculation process, each time the power is off, the controller writes the calculation result into the ECU memory, and after the power is on next time, the controller reads the data stored in the memory to continue the previous settlement process. The calculation result output by the controller 12 is corrected by the ambient humidity correction factor and the ambient temperature and pressure correction factor to obtain the corrected operating mileage from the last successful regeneration. The operating mileage is compared to a product of a regeneration trigger mileage threshold and a DPF aging correction factor, and if the operating time is greater than the product, a regeneration trigger request occurs.
The three parallel branches can be respectively provided with a timer and an ECU, and the three ECUs are used for respectively processing the data of the three branches. The same ECU can be shared, and the data processing processes of the three branches can be simultaneously carried out through different processes of the same ECU. Any branch circuit meets the condition, DPF regeneration can be triggered, after DPF regeneration is successful, the running time, the running oil consumption and the running mileage from the previous regeneration success are reset to 0, data writing and reading are carried out again in the next processing period, and related parameter calculation from the previous DPF regeneration success is carried out.
As can be seen from the above description, embodiments of the present invention provide a DPF regeneration control method, which performs DPF aging correction factor calculation based on an ash component, an aftertreatment temperature, and an aftertreatment operating time, provides a scheme for performing regeneration control based on an engine operating time, an operating oil consumption, and an operating mileage, and performs a scheme for correcting a DPF carbon loading model based on an ambient temperature, an ambient humidity, and a pressure, so as to improve DPF regeneration efficiency, prolong an aftertreatment life, and improve engine economy.
Based on the foregoing embodiment, another embodiment of the present invention further provides a DPF regeneration control system, which is shown in fig. 5, where fig. 5 is a schematic structural diagram of the DPF regeneration control system according to the embodiment of the present invention, and the DPF regeneration control system includes:
the acquisition module 21, the acquisition module 21 is used for acquiring the detected value of the DPF regeneration related parameter in one processing period;
the correction module 22, the correction module 22 is configured to correct the detection value based on the ambient humidity, the temperature, and the pressure, so as to obtain a first parameter;
a comparison module 23, wherein the comparison module 23 is configured to compare a product of a regeneration trigger threshold and a preset DPF aging correction factor with the first parameter;
a judging module 24, wherein the judging module 24 is used for judging whether DPF regeneration triggering conditions are met or not based on the comparison result;
and a control module 25, wherein if the DPF regeneration triggering condition is met, the control module 25 is used for carrying out DPF regeneration control.
The control system provided by the embodiment of the invention can realize the control method, the DPF aging correction factor is calculated based on the ash content, the post-treatment temperature and the post-treatment operation time, the scheme of carrying out regeneration control based on the engine operation time, the operation oil consumption and the operation mileage is provided, and the scheme of correcting the DPF carbon-carrying capacity model based on the environment temperature, the environment humidity and the pressure is carried out, so that the DPF regeneration efficiency can be improved, the post-treatment service life can be prolonged, and the economy of the engine can be improved.
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. For the control system disclosed by the embodiment, the control method disclosed by the embodiment corresponds to the control system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
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. A method of controlling DPF regeneration, comprising:
acquiring a detected value of a DPF regeneration related parameter in one processing period;
correcting the detection value based on the environment humidity, the temperature and the pressure to obtain a first parameter;
comparing a product of a regeneration trigger threshold and a preset DPF aging correction factor with the first parameter;
judging whether DPF regeneration triggering conditions are met or not based on the comparison result;
if so, DPF regeneration is performed.
2. The control method according to claim 1, wherein the DPF aging correction factor calculation method includes:
calculating a post-treatment correction factor based on an efficiency factor of the ash content, a rapid aging factor of the post-treatment temperature and a life factor of the post-treatment operation time;
and integrating the post-processing correction factor to obtain the DPF aging correction factor.
3. The control method of claim 2, wherein the aftertreatment correction factor is a product of the efficiency factor, the rapid aging factor, and the life factor.
4. The control method according to claim 1, wherein the method of obtaining the DPF regeneration-related parameter includes:
triggering a timer to start timing at the starting time of the processing period, and calculating the detection value of the related parameter;
in the same processing period, after the timer starts timing, each time the power is off, the detection value is stored in the ECU, and after the power is on again, the detection value read from the ECU is started to calculate the detection value of the relevant parameter.
5. The control method according to claim 4, wherein, when the DPF regeneration of one of the processing cycles is successful, the detection value stored in the ECU is cleared, and the control process of the DPF regeneration of the next processing cycle is started.
6. The control method according to claim 1, wherein the first parameter is a product of the detection value and an ambient humidity correction factor and an ambient temperature and pressure correction factor.
7. The control method according to claim 6, wherein the calculation method of the ambient humidity correction factor includes:
and acquiring the environment humidity correction factor under the current environment humidity based on the functional relation between the environment humidity correction factor and the environment humidity.
8. The control method of claim 6, wherein the method of calculating the ambient temperature and pressure correction factor comprises:
and acquiring the ambient temperature and pressure correction factors under the current ambient temperature and pressure based on the functional relationship between the ambient temperature and pressure correction factors and the current ambient temperature and pressure.
9. The control method according to any one of claims 1 to 8, characterized in that the relevant parameters include: at least one of an operating time, an operating oil consumption, and an operating mileage of the engine; the regeneration trigger threshold includes: a regeneration triggering time threshold corresponding to the running time, a regeneration triggering oil consumption threshold corresponding to the running oil consumption and a regeneration triggering mileage threshold corresponding to the running mileage;
the method of comparing the product of the regeneration trigger threshold and the pre-set DPF aging correction factor to the first parameter comprises:
comparing the product of the regeneration trigger time threshold and the DPF aging correction factor to a first parameter of the runtime if the parameter of interest comprises the runtime; if the first parameter of the running time is not less than the product corresponding to the first parameter, the DPF regeneration triggering condition is met;
comparing a product of the regeneration trigger oil consumption threshold and the DPF aging correction factor to a first parameter of the operating oil consumption if the related parameter comprises the operating oil consumption; if the first parameter of the operating oil consumption is not less than the product corresponding to the first parameter, the DPF regeneration triggering condition is met;
comparing a product of the regeneration trigger mileage threshold and the DPF aging correction factor to a first parameter of the operating mileage if the related parameter includes the operating mileage; and if the first parameter of the operating mileage is not less than the product corresponding to the first parameter, the DPF regeneration triggering condition is met.
10. A control system for DPF regeneration, comprising:
the acquisition module is used for acquiring a detection value of the DPF regeneration related parameter in one processing period;
the correction module is used for correcting the detection value based on the environment humidity, the temperature and the pressure to obtain a first parameter;
the comparison module is used for comparing the product of a regeneration trigger threshold and a preset DPF aging correction factor with the first parameter;
the judging module is used for judging whether DPF regeneration triggering conditions are met or not based on the comparison result;
and the control module is used for carrying out DPF regeneration control if the DPF regeneration triggering condition is met.
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