CN114704361B

CN114704361B - DPF partial regeneration control method, device, electronic equipment and storage medium

Info

Publication number: CN114704361B
Application number: CN202210455237.3A
Authority: CN
Inventors: 王秀雷; 文武红; 马广营; 王坤
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2023-07-18
Anticipated expiration: 2042-04-24
Also published as: CN114704361A

Abstract

The application relates to the technical field of engine exhaust aftertreatment, in particular to a DPF partial regeneration control method, a device, electronic equipment and a storage medium, wherein the method comprises the following steps: the method comprises the steps of obtaining the SOF mass of soluble organic matters and the PM mass of particulate matters in a particulate matter collector DPF, judging whether the PM mass is larger than a first threshold value, and judging whether the ratio of the SOF mass to the PM mass is larger than a second threshold value; if yes, obtaining a pyrolysis temperature target value of the SOF, searching corresponding pyrolysis time by utilizing the pyrolysis temperature target value and the SOF quality, and carrying out a pyrolysis process of the SOF based on the pyrolysis temperature target value and the pyrolysis time. Therefore, the regeneration oil consumption can be reduced, the regeneration period can be prolonged, the comprehensive regeneration cost can be reduced, and the economic benefit can be further improved.

Description

DPF partial regeneration control method, device, electronic equipment and storage medium

Technical Field

The application relates to the technical field of engine exhaust aftertreatment, in particular to a DPF part regeneration control method, a device, electronic equipment and a storage medium.

Background

A particulate matter collector (Diesel ParticulateFilter, DPF) is arranged in an emission system of the Diesel engine of the vehicle and is used for filtering out most of particulate matters (Particulate Matter, PM) such as soot particles and the like in tail gas of the engine, so that PM emission is effectively reduced. Currently, DPF regeneration includes active regeneration and passive regeneration. Active regeneration refers to the use of external energy to raise the temperature within the filter (e.g., to 550 ℃) to cause the particulate to ignite and burn. Passive regeneration refers to the use of a fuel additive or catalyst to reduce the ignition temperature of the particulates so that the particulates can burn on fire at normal diesel exhaust temperatures.

In the prior art, as the running time of an engine increases, the accumulation amount of soot particles and soluble organic matters in a DPF increases, so that the exhaust back pressure increases to affect the dynamic property and the fuel economy of the engine, and therefore, when the accumulation of the soot particles and the soluble organic matters reaches a certain threshold value, the engine needs to be actively regenerated regularly, namely, the engine sprays diesel oil after spraying in a cylinder or spraying in a tail pipe, the diesel oil oxidizes and releases heat in a diesel oxidation catalyst (Diesel Oxidation Catalyst, DOC) to generate high temperature, and the soot particles and the soluble organic matters are oxidized and combusted at high temperature to remove the soot particles and the soluble organic matters, so that the DPF function is recovered.

However, the method has high regeneration oil consumption and short regeneration period, and causes a great amount of resource waste.

Disclosure of Invention

The DPF partial regeneration control method, the DPF partial regeneration control device, the electronic equipment and the storage medium can reduce regeneration oil consumption, prolong regeneration period, reduce comprehensive regeneration cost and further improve economic benefit.

In a first aspect, the present application provides a DPF partial regeneration control method, the method comprising:

acquiring the SOF mass of soluble organic matters and the PM mass of the particulate matters in the particulate matter collector DPF, and judging whether the PM mass is larger than a first threshold value or not, and whether the ratio of the SOF mass to the PM mass is larger than a second threshold value or not;

If yes, obtaining a pyrolysis temperature target value of the SOF, searching corresponding pyrolysis time by utilizing the pyrolysis temperature target value and the SOF quality, and carrying out a pyrolysis process of the SOF based on the pyrolysis temperature target value and the pyrolysis time.

Optionally, obtaining the pyrolysis temperature target value of the SOF includes:

acquiring an initial pyrolysis temperature target value and a correction coefficient of SOF; the correction coefficient is used for correcting the pyrolysis temperature value of the SOF;

and calculating the product of the initial pyrolysis temperature target value and the correction coefficient to obtain the pyrolysis temperature target value.

Optionally, obtaining the initial pyrolysis temperature target value and the correction coefficient of the SOF includes:

acquiring the rotating speed and the torque of an engine, and determining corresponding correction coefficients in a lookup table based on the rotating speed and the torque;

an initial pyrolysis temperature target value is determined based on the SOF mass.

Optionally, searching for a corresponding pyrolysis time by using the pyrolysis temperature target value and the SOF quality, and performing a pyrolysis process of the SOF based on the pyrolysis temperature target value and the pyrolysis time, including:

searching corresponding pyrolysis time in a lookup table based on the pyrolysis temperature target value and the SOF quality; the pyrolysis time is used to control the duration of pyrolysis of the SOF;

And carrying out a pyrolysis process on the SOF by using the searched pyrolysis time and the pyrolysis temperature target value, wherein the pyrolysis process is regeneration control of the SOF.

Optionally, the method further comprises:

obtaining an average temperature during pyrolysis of the SOF and a duration of time to reach the average temperature;

judging whether the average temperature is greater than or equal to the pyrolysis temperature target value and whether the duration is greater than or equal to the pyrolysis time;

if yes, determining that the pyrolysis process of the SOF is finished.

Optionally, the method further comprises:

in the pyrolysis process of SOF, obtaining average pressure inside DPF;

judging whether the average temperature is greater than or equal to the pyrolysis temperature target value, whether the duration is greater than or equal to the pyrolysis time, and whether the average pressure is less than or equal to a third threshold;

if yes, determining that the pyrolysis process of the SOF is finished.

Optionally, obtaining the mass of the soluble organic matter SOF and the mass of the particulate matter PM in the particulate matter supplemental collector DPF includes:

based on the physical model, identifying and calculating the mass of carbon particles and SOF in the DPF;

and calculating the sum of the mass of the carbon particles and the mass of the SOF to obtain the mass of PM.

Optionally, the method further comprises:

if the PM mass is greater than or equal to a first threshold and the ratio of the SOF mass to the PM mass is less than a second threshold, performing a DPF regeneration process; the DPF regeneration process includes a pyrolysis process of SOF and a combustion process of carbon particles.

In a second aspect, the present application also provides a DPF partial regeneration control device, the device including:

the acquisition module is used for acquiring the SOF mass of the soluble organic matters and the PM mass of the particulate matters in the particulate matters collector DPF, judging whether the PM mass is larger than a first threshold value or not, and judging whether the ratio of the SOF mass to the PM mass is larger than a second threshold value or not;

and the processing module is used for acquiring a pyrolysis temperature target value of the SOF when the PM mass is larger than a first threshold value and the ratio of the SOF mass to the PM mass is larger than a second threshold value, searching corresponding pyrolysis time by utilizing the pyrolysis temperature target value and the SOF mass, and carrying out a pyrolysis process of the SOF based on the pyrolysis temperature target value and the pyrolysis time.

In a third aspect, the present application further provides an electronic device, including: a processor, a memory and a computer program; wherein the computer program is stored in the memory and configured to be executed by the processor, the computer program comprising instructions for performing the DPF portion regeneration control method according to any one of the first aspects.

In a fourth aspect, the present application also provides a computer-readable storage medium storing computer-executable instructions for implementing the DPF portion regeneration control method according to any one of the first aspects when executed by a processor.

In a fifth aspect, the present application also provides a computer program product comprising a computer program which, when executed by a processor, implements the method according to any of the first aspects.

In summary, the present application provides a method, an apparatus, an electronic device, and a storage medium for controlling partial regeneration of a DPF, where the method may obtain the SOF mass of soluble organic matters and the PM mass of particulate matters in a particulate matter collector DPF, and determine whether the PM mass is greater than a first threshold, and whether a ratio of the SOF mass to the PM mass is greater than a second threshold; if yes, obtaining a pyrolysis temperature target value of the SOF, searching corresponding pyrolysis time by utilizing the pyrolysis temperature target value and the SOF quality, and carrying out a pyrolysis process of the SOF based on the pyrolysis temperature target value and the pyrolysis time. Because DPF regeneration is divided into two sections, the first section is the pyrolysis of SOF, and the second section is the burning of carbon granule, only carries out the pyrolysis of first section SOF, does not carry out the burning of second section carbon granule, and is the partial regeneration for differential pressure part resumes, and then DPF can continue to use, like this, can reduce regeneration oil consumption, extension regeneration cycle, reduction comprehensive regeneration cost, thereby promote economic benefits.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;

FIG. 2A is a schematic diagram of SOF to carbon particle mass ratio in an engine PM under WHTC cycling according to an embodiment of the present application;

FIG. 2B is a schematic diagram of a mass ratio of SOF to carbon particles in a DPF under a WHTC cycle according to an embodiment of the present application;

FIG. 3A is a schematic diagram illustrating PM emission of an engine under steady-state conditions according to an embodiment of the present disclosure;

FIG. 3B is a schematic diagram illustrating carbon particulate emissions of an engine under steady-state conditions according to an embodiment of the present disclosure;

FIG. 3C is a schematic diagram illustrating SOF emissions from an engine under steady state conditions according to an embodiment of the present disclosure;

FIG. 3D is a schematic diagram illustrating a mass ratio of SOF to carbon particles in an engine PM under steady-state conditions according to an embodiment of the present disclosure;

FIG. 4 is a flow chart of a DPF partial regeneration control method provided in an embodiment of the present application;

fig. 5 is a schematic diagram of a PM in a pyrolysis process according to an embodiment of the present disclosure;

FIG. 6 is a schematic flow chart for identifying partial regeneration success of a DPF according to an embodiment of the present application;

FIG. 7 is a flow chart of a specific DPF partial regeneration control method provided in an embodiment of the present application;

FIG. 8 is a schematic diagram of a DPF partial regeneration control apparatus according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

In order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. For example, the first device and the second device are merely for distinguishing between different devices, and are not limited in their order of precedence. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

In this application, the terms "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

Embodiments of the present application are described below with reference to the accompanying drawings. Fig. 1 is a schematic diagram of an application scenario provided in an embodiment of the present application, and the method for controlling DPF partial regeneration provided in the present application may be applied to the application scenario shown in fig. 1. The application scene is a truck 101 in running, wherein an engine 102, a temperature sensor 104, a common rail fuel system 103, a cooler, an intercooler, a diesel oxidation catalyst (Diesel Oxidation Catalyst, DOC) and a DPF105 are arranged in the truck 101, the cooler is used for cooling the common rail fuel system 103, the intercooler is used for cooling gas exhausted by an exhaust pipe of the engine 102, the DOC is the first step of tail gas aftertreatment, carbon monoxide, hydrocarbon and the like in oxidized waste gas are converted into harmless gas, the DPF105 is arranged behind the DOC, and particulate emissions can be captured before entering the atmosphere, so that the particulate matters of the tail gas emission are reduced. When the DPF105 captures particulate matter, the captured particulate matter is oxidized and digested, and the DPF is regenerated.

Specifically, the DPF105 may further perform pyrolysis of the SOF by acquiring the mass of the soluble organic matter (Soluble Organic Fraction, SOF) and the mass of the PM, according to the conditions that the mass of the SOF and the mass of the PM trigger partial regeneration, so that the pressure difference portion is restored, and the DPF105 may further perform oxidative digestion on the trapped particulate matter.

It can be understood that the execution body of the embodiment of the present application may be the DPF105, or may be another controller, and the acquired information is sent to the controller to be uniformly processed, which is not specifically limited in the embodiment of the present application.

The number and installation positions of the temperature sensors 104 are not particularly limited, and they may be installed in the positions shown in fig. 1 or may be installed in other positions, but the temperature sensors 104 are required to have the purpose of measuring the temperature required to implement the DPF portion regeneration control method.

In the prior art, as the running time of an engine increases, the accumulation amount of soot particles and soluble organic matters in a DPF increases, so that the exhaust back pressure increases to influence the dynamic property and the fuel economy of the engine, and therefore, when the accumulation of the soot particles and the soluble organic matters reaches a certain threshold value, the engine needs to be actively regenerated regularly, namely, the engine sprays diesel oil after through a post-injection in a cylinder or a tail pipe, the diesel oil oxidizes and releases heat in a DOC to generate high temperature, and the soot particles and the soluble organic matters are removed through high-temperature oxidation and combustion, so that the DPF function is recovered.

According to the method, the mass of PM, SOF and carbon particles (boot) in the heating process and the mass ratio of SOF and PM are found through DPF regeneration analysis, the combustion of carbon particles is not carried out through pyrolysis of SOF only, namely partial regeneration is carried out, the pressure difference can be partially recovered, the DPF can be used continuously, and therefore the regeneration oil consumption is reduced, and the regeneration period is prolonged.

2A-3D show schematic state diagrams for measuring the mass of PM, SOF and carbon particles and the ratio of the mass of SOF and the mass of PM under different environments, and the experiment proves that the pyrolysis of SOF can be triggered to realize the regeneration control of DPF by setting judging conditions based on the mass ratio of SOF and the mass of PM, wherein the mass of PM=the mass of SOF+the mass of carbon particles.

FIG. 2A is a schematic diagram of SOF to carbon particle mass ratio in an engine PM under WHTC cycling according to an embodiment of the present application; as shown in fig. 2A, the mass ratio of SOF to carbon particles in the PM of the engine is found by testing the mass ratio of SOF to PM in the engine under the global unified transient test Cycle (World Harmonized Steady-State Cycle, WHTC), and under normal conditions, the ratio of SOF to PM is stabilized at 0.6, and under heating conditions, the ratio of SOF to PM is changed as compared with that under normal conditions, so that the judgment condition can be set based on the ratio of SOF to PM, and similarly, fig. 2B is a schematic diagram of the State of the ratio of SOF to carbon particles in the DPF under the WHTC Cycle provided in the embodiment of the present application; as shown in fig. 2B, it was found by testing the mass ratio of SOF to carbon particles in the DPF at WHTC that the ratio of SOF mass to PM mass under normal conditions tended to be stabilized at 0.6, but the ratio of SOF mass to PM mass under heating fluctuated more than under normal conditions, and therefore, the judgment condition could be set based on the mass ratio of SOF to PM mass.

FIG. 3A is a schematic diagram illustrating PM emission of an engine under steady-state conditions according to an embodiment of the present disclosure; as shown in fig. 3A, during steady state conditions, the tendency of PM emissions in an engine at different temperatures is based on various torques; FIG. 3B is a schematic diagram illustrating carbon particulate emissions of an engine under steady-state conditions according to an embodiment of the present disclosure; as shown in fig. 3B, under steady state conditions, the tendency of carbon particles in the engine to be discharged at different temperatures is based on various torques; FIG. 3C is a schematic diagram illustrating SOF emissions from an engine under steady state conditions according to an embodiment of the present disclosure; as shown in FIG. 3C, under steady state conditions, SOFs in the engine tend to exhaust at different temperatures based on various torques; further, based on the above test data, calculating a mass ratio of SOF to carbon particles in the engine PM, and fig. 3D is a schematic state diagram of the mass ratio of SOF to carbon particles in the engine PM under a steady-state working condition according to an embodiment of the present application; as shown in fig. 3D, under steady-state conditions, the tendency of the SOF mass to PM mass ratio at different temperatures is based on multiple torques; therefore, it can be found that the control of regeneration of the DPF portion is achieved by setting a judgment condition for the mass ratio PM mass (or the mass of the SOF, the mass of the carbon particles) to trigger the pyrolysis of the SOF.

Therefore, the embodiment of the application provides a DPF partial regeneration control method, which divides a DPF regeneration process into two sections, wherein the first section is pyrolysis of SOF and combustion of carbon particles of the second section, and the application introduces a judgment condition for triggering the pyrolysis of the SOF, namely if the ratio of the mass of the SOF to the total amount of PM exceeds a threshold value and the total amount of PM exceeds the threshold value, only the pyrolysis of the SOF of the first section is performed, namely partial regeneration, so that a differential pressure part is recovered, and the DPF can be continuously used, thereby realizing the purposes of reducing regeneration oil consumption and prolonging the regeneration period.

The technical scheme of the present application is described in detail below with specific examples. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 4 is a flow chart of a DPF partial regeneration control method provided in an embodiment of the present application; as shown in fig. 4, the method of the present embodiment may include:

s401, acquiring the SOF mass of the soluble organic matters and the PM mass of the particulate matters in the particulate matter collector DPF, and judging whether the PM mass is larger than a first threshold value or not, and whether the ratio of the SOF mass to the PM mass is larger than a second threshold value or not.

In the embodiment of the application, the DPF regeneration process can be divided into two sections, wherein the first section is a pyrolysis process of SOF, and the second section is a combustion process of carbon particles, and the pyrolysis process of SOF is only performed to perform DPF partial regeneration, wherein the regeneration can be divided into two categories, namely active regeneration and passive regeneration; active regeneration refers to injecting diesel oil through a post-injection or seventh-branch injection nozzle of an engine to enable carbon particles to be at a high temperature (more than 500 ℃) and O ₂ The reaction, typically the process occurs periodically; passive regeneration refers to the reaction of carbon particles with NO at lower temperatures (typically 250 ℃ -450 ℃) by engine thermal management measures or when the engine is operating at high temperature conditions ₂ The reaction, which is generally continuous, is carried out in part of the DPFThe type of regeneration is not limited, and may be active or passive.

In this step, the judging condition for triggering the regeneration of the DPF is set to be whether the PM mass is greater than a first threshold and whether the ratio of the SOF mass to the PM mass is greater than a second threshold, so that the SOF can be only pyrolyzed, and other particulate matters (such as carbon particles) in the PM are not burned.

And S402, if so, acquiring a pyrolysis temperature target value of the SOF, searching corresponding pyrolysis time by utilizing the pyrolysis temperature target value and the SOF quality, and carrying out a pyrolysis process of the SOF based on the pyrolysis temperature target value and the pyrolysis time.

In the embodiment of the application, the pyrolysis process of the SOF refers to performing thermal management control on the SOF by using a throttle valve, post injection, hydrocarbon (HC) injection, injection advance angle and the like, taking engine thermal management control in an active regeneration process as an example, and in the first step, a throttle valve is utilized to hold down a throttle valve, the opening of the throttle valve is reduced, and the fresh air content is reduced; step two, opening the post-injection, namely opening the near post-injection to raise the exhaust temperature of the engine, and opening the far post-injection to raise the DPF temperature; and a third step of performing HC injection based on the injection advance angle, retarding ignition, and the like.

In this step, the particulate matter pyrolyzed in the PM at different temperatures is different, and therefore, it is necessary to obtain a target value of the pyrolysis temperature of the SOF, and pyrolyzing the SOF based on the target value of the pyrolysis temperature; for example, fig. 5 is a schematic diagram of a state of PM in the pyrolysis process according to the embodiment of the present application, where, as shown in fig. 5, before 330 ℃, the pyrolysis of SOF is performed, and when the temperature reaches 270 ℃, the pyrolysis efficiency is the best, and the mass change rate reaches the highest value; at 330-440 ℃, the pyrolysis of the carbon particles is started, at 440-580 ℃, the combustion oxidation process is performed firstly, at 580-720 ℃, the post combustion oxidation process is performed, and the pyrolysis process before 440 ℃ is considered as part of the regeneration in the application.

For example, after the target value of the pyrolysis temperature of the SOF is obtained, the duration of performing the SOF pyrolysis process needs to be searched, because if the duration of performing the pyrolysis based on the target value of the pyrolysis temperature is too long, resource waste may be caused, and if the duration of performing the pyrolysis based on the target value of the pyrolysis temperature is too short, the pyrolysis may be insufficient, so that the corresponding pyrolysis time may be searched in the lookup table by using the target value of the pyrolysis temperature and the quality of the SOF, and further, the duration of performing the SOF pyrolysis based on the searched pyrolysis time and the target value of the pyrolysis temperature may be stored in the lookup table, or may be stored in the controller.

It will be appreciated that specific values of the pyrolysis temperature target value and the pyrolysis time may refer to test data, or may be set manually, and the embodiment of the present application is not particularly limited thereto, for example, the pyrolysis temperature target value is 400 ℃, and the pyrolysis time is 30 minutes.

It should be noted that the pyrolysis process of the SOF also includes pyrolysis of a part of carbon particles, and pyrolysis of other particulate matters is also provided in the whole pyrolysis process.

Therefore, the present application provides a DPF partial regeneration control method, which can determine whether the PM mass and the ratio of the SOF mass to the PM mass satisfy a preset condition by acquiring the SOF mass of soluble organic matters and the PM mass of particulate matters in a particulate matter collector DPF; if yes, obtaining a pyrolysis temperature target value of the SOF, searching corresponding pyrolysis time by utilizing the pyrolysis temperature target value and the SOF quality, and carrying out a pyrolysis process of the SOF based on the pyrolysis temperature target value and the pyrolysis time. Because DPF regeneration is divided into two sections, the first section is the pyrolysis of SOF, and the second section is the burning of carbon granule, only carries out the pyrolysis of first section SOF, does not carry out the burning of second section carbon granule, and is the partial regeneration for differential pressure part resumes, and then DPF can continue to use, like this, can reduce regeneration oil consumption, extension regeneration cycle, reduction comprehensive regeneration cost, thereby promote economic benefits.

In this embodiment, the initial pyrolysis temperature target value may refer to an exhaust gas temperature target value, that is, a temperature at which pyrolysis of the SOF is performed in an ideal state, because heat may be released during pyrolysis, the temperature may be unstable, or temperature changes may be caused due to other uncertain factors, so that it is required to calculate a pyrolysis temperature target value, so that the SOF is pyrolyzed at the pyrolysis temperature target value, and the control range is provided.

Specifically, a correction coefficient may be obtained and used to correct a pyrolysis temperature value of the SOF to obtain a pyrolysis temperature target value, where the correction coefficient is stored in a lookup table (Map) or may be stored in a controller, and in this embodiment of the present application, a storage location of the correction coefficient is not limited.

Further, the correction coefficient found in the lookup table is used for correcting the initial pyrolysis temperature target value, namely, the product of the initial pyrolysis temperature target value and the correction coefficient is calculated, so that the pyrolysis temperature target value is obtained.

Therefore, the method and the device can determine the initial pyrolysis temperature target value and the correction coefficient in real time, further determine the pyrolysis temperature target value, enable the pyrolysis temperature to be in a reasonable range, enable the pyrolysis process to be in a stable state, reduce interference caused by unreasonable pyrolysis temperature setting, and improve treatment flexibility.

In the embodiment of the application, the lookup table stores the corresponding relation between the rotation speed and the torque and the correction coefficient, namely the corresponding correction coefficient can be found in the lookup table based on the rotation speed and the torque of the engine; the torque of the engine refers to a specific index of the acceleration capacity of the engine, namely, the reciprocating motion of a piston in a cylinder is performed, and work is performed once in a reciprocating way; the rotation speed of the engine refers to the number of times of work done in unit time or the effective power of the engine.

Accordingly, the initial pyrolysis temperature target value is determined based on the SOF quality, that is, under the condition that the amount of the SOF quality is known, the corresponding initial pyrolysis temperature target value can be determined, the corresponding relation between the SOF quality and the initial pyrolysis temperature target value can also be stored in a lookup table for searching during use, so that the searching efficiency is improved, and the corresponding relation between the SOF quality and the initial pyrolysis temperature target value can be obtained through a test or can be set manually.

Optionally, the corresponding initial pyrolysis temperature target value is calculated based on the SOF quality by using a predefined algorithm, where the predefined algorithm is a neural network model based on deep learning, and may also be other algorithms, and the embodiments of the present application are not limited in particular, for example, after the SOF quality is obtained, the SOF quality is input into the trained neural network model, so as to obtain the predicted initial pyrolysis temperature target value.

It can be understood that the neural network model can also be trained by using the SOF quality, the initial pyrolysis temperature target value and the correction coefficient, so that after the SOF quality is obtained, the SOF quality is input into the trained neural network model, the pyrolysis temperature target value is directly obtained, the calculation steps are simplified, and the calculation efficiency and accuracy are improved.

Therefore, the method and the device can determine the corresponding correction coefficient in the lookup table based on the state of the engine, and determine the initial pyrolysis temperature target value based on the SOF quality, can adapt to different conditions, and can also improve the lookup rate.

In this embodiment, the lookup table is a table storing the correspondence between the target pyrolysis temperature value and the SOF quality and the pyrolysis time, that is, each group of target pyrolysis temperature value and SOF quality has a corresponding pyrolysis time, and the pyrolysis time is a duration for controlling the SOF to pyrolyze based on the target pyrolysis temperature value, and the duration is a reasonable time, that is, the pyrolysis state of the SOF reaches the best within the duration, and neither insufficient pyrolysis nor excessive pyrolysis can occur.

It is understood that the pyrolysis temperature target value and the correspondence between the SOF quality and the pyrolysis time may also be stored in other memories, which are not specifically limited in the embodiments of the present application, and specific values of the pyrolysis time are not limited in the embodiments of the present application.

In this step, the regeneration control of the SOF refers to the DPF partial regeneration control, that is, the pyrolysis process of the SOF of the first stage in the DPF regeneration process is performed, and after the pyrolysis temperature target value and the pyrolysis time corresponding to the SOF quality are found in the lookup table, the pyrolysis process may be performed on the SOF based on the pyrolysis temperature target value and the pyrolysis time.

Therefore, the method and the device can search the corresponding pyrolysis time in the lookup table based on the pyrolysis temperature target value and the SOF quality, and utilize the pyrolysis time to carry out the pyrolysis of the SOF, so that the excessive pyrolysis can be reduced, the resource waste is reduced, and the pyrolysis accuracy is improved.

Optionally, the method further comprises:

if yes, determining that the pyrolysis process of the SOF is finished.

In this embodiment of the present application, in the pyrolysis process of the SOF, a plurality of actual temperatures in a preset time period may be obtained, and an average temperature may be obtained by calculating an average value of the plurality of actual temperatures, where the preset time period is a certain time period in the pyrolysis process of the SOF set in advance by the system, or may be a certain time period in the pyrolysis process of the artificially selected SOF, so as to calculate an average temperature in the time period, and further determine whether the average temperature is greater than or equal to the target value of the pyrolysis temperature.

Optionally, in the pyrolysis process of the SOF, a certain temperature can be selected as an average temperature in a preset time period at intervals, so as to judge whether the average temperature is greater than or equal to the target pyrolysis temperature value, thus reducing the step of acquiring the temperature value at each time and saving resources.

Wherein the duration of reaching the average temperature is a duration from starting pyrolysis of the SOF to obtaining the average temperature, and determining whether a process of pyrolysis meets a requirement of pyrolysis time by judging whether the duration is greater than or equal to pyrolysis time.

For example, in the application scenario of fig. 1, the DPF105 may acquire a plurality of temperatures measured by the temperature sensor 104 during the pyrolysis process of the SOF in a certain period of time, and determine that the pyrolysis process of the SOF is finished by calculating an average temperature of 420 ℃ during the period of time and acquiring a duration of time for reaching the average temperature of 50 minutes, and further determining that the average temperature is greater than the pyrolysis temperature target value of 400 ℃ and the duration of time is greater than the pyrolysis time of 30 minutes.

Therefore, the method and the device can introduce the judging condition of success of regeneration of SOF pyrolysis to determine whether partial regeneration of the DPF is successful, further determine that continuous pyrolysis treatment is not needed, save resources and improve economic benefit.

Optionally, the method further comprises:

in the pyrolysis process of SOF, obtaining average pressure inside DPF;

if yes, determining that the pyrolysis process of the SOF is finished.

In the embodiment of the application, in the pyrolysis process of the SOF, a plurality of actual pressures in a preset time period can be obtained, and the average value of the actual pressures is calculated to obtain an average pressure, wherein the actual pressure is determined based on the rotating speed and the torque of the engine; the preset time period may be a certain time period in the pyrolysis process of the SOF set in advance by the system, or may be a certain time period in the pyrolysis process of the SOF selected manually, so as to calculate the average pressure in the time period, and further determine whether the average pressure is less than or equal to a third threshold.

Similarly, in the pyrolysis process of the SOF, a certain actual pressure can be selected as an average pressure in a preset time period at intervals, so that whether the actual pressure is smaller than or equal to a third threshold value is judged, and therefore, the steps of acquiring the actual pressure every time are reduced, resources are saved.

For example, fig. 6 is a schematic flow chart for identifying partial regeneration success of a DPF according to an embodiment of the present application, as shown in fig. 6, the DPF obtains a temperature target value 2 (i.e. a pyrolysis temperature target value) and a required duration 2 (i.e. a pyrolysis time), and an actual T5 temperature average value (i.e. an average temperature), an actual duration (i.e. a duration time) and a differential pressure recovery average value (i.e. an average pressure) are obtained by calculating, further, it is determined whether the actual T5 temperature average value is greater than or equal to the temperature target value 2, the actual duration time is greater than or equal to the required duration 2, and the differential pressure recovery average value is less than or equal to a differential pressure recovery limit, if the determination result is yes, it indicates that partial regeneration of the DPF is successful, and a partial regeneration success identification of the DPF is obtained.

Wherein the differential pressure recovery limit (i.e., the third threshold) is determined by: searching a regeneration critical state differential pressure calibration (maximum value of partial regeneration pressure of a DPF), a fresh state differential pressure calibration (actual pressure) and a proportionality coefficient threshold value in a lookup table based on the rotating speed and torque of an engine, and further calculating the product of the difference and the proportionality coefficient threshold value by calculating the difference between the regeneration critical state differential pressure calibration and the fresh state differential pressure calibration, so as to calculate the difference between the regeneration critical state differential pressure calibration and the product to obtain a differential pressure recovery limit value; the scaling factor threshold is used to adjust the fluctuation of the difference to determine a reasonable pressure differential recovery limit.

Therefore, the DPF partial regeneration can be determined whether to be successful or not by judging the average temperature, the duration and the average pressure, and the accuracy of judging the triggering of the DPF partial regeneration is improved.

In this step, the physical model may refer to a mathematical model established based on a designed algorithm, and may analyze components inside the DPF to determine the types of particulate matters, for example, may be a neural network model established based on deep learning, or may be a convolutional neural network model, which is not specifically limited in the embodiment of the present application. The data input into the physical model is the data which is recognized and measured by the recognition instrument.

For example, in the application scenario of fig. 1, the DPF105 may identify and calculate the mass of carbon particles and the mass of SOF inside the DPF based on the neural network model established by deep learning; further, the sum of the mass of the carbon particles and the mass of the SOF is calculated to obtain the mass of PM.

In another example, the DPF105 may identify and calculate the carbon particulate mass, SOF mass, and PM mass inside the DPF based on a neural network model established by deep learning.

Therefore, the SOF quality and the PM quality can be accurately obtained, and the accuracy of triggering the DPF partial regeneration control method can be improved.

Optionally, the method further comprises:

Wherein the combustion process of the carbon particles comprises: and acquiring a combustion temperature target value of the carbon particles, searching corresponding combustion time by utilizing the combustion temperature target value and the mass of the carbon particles, and carrying out a combustion process of the carbon particles based on the combustion temperature target value and the combustion time.

For example, in the application scenario of fig. 1, the DPF105 may acquire the SOF mass and the PM mass in the DPF105, so as to determine whether the PM mass is greater than a first threshold and whether the ratio of the SOF mass to the PM mass is greater than a second threshold; if so, obtaining a pyrolysis temperature target value 400 ℃ of the SOF, searching a corresponding pyrolysis time for 30 minutes in a lookup table by utilizing the temperature 400 ℃ and based on the mass of the SOF, performing a pyrolysis process of the SOF, and if the mass of PM is larger than or equal to a first threshold value and the ratio of the mass of the SOF to the mass of PM is smaller than a second threshold value, performing a DPF regeneration process, namely performing pyrolysis of the SOF based on the temperature 400 ℃ and the time of 30 minutes, obtaining a combustion temperature target value 600 ℃ and the combustion time of 40 minutes, and performing a combustion process on carbon particles.

It can be appreciated that the regeneration process of the DPF is to pyrolyze and burn particulate matters in the DPF, and then remove the particulate matters, when the application only pyrolyzes the SOF, only the soluble organic matters SOF are removed, the mass of the blocked particles can be reduced, and the pressure difference part is recovered, so that the DPF can be continuously used, the PM mass of the particulate matters needs a long time to reach the threshold value, and when the PM mass is greater than or equal to the first threshold value and the ratio of the SOF mass to the PM mass is smaller than the second threshold value, the combustion stage in the regeneration process of the DPF is performed, the regeneration period is improved, and the waste of oil consumption is reduced.

Therefore, the method and the device can trigger the full regeneration of the DPF, so that the DPF is recovered, the DPF can be used continuously, and the flexibility of treatment is improved.

In connection with the above embodiments, fig. 7 is a schematic flow chart of a specific DPF portion regeneration control method according to an embodiment of the present application; as shown in fig. 7, the steps of the execution method in the embodiment of the present application include:

step A: obtaining a carbon particle loading (i.e. carbon particle mass) and a SOF loading (i.e. SOF mass), obtaining a PM loading (i.e. PM mass) by calculating the sum of the carbon particle loading and the SOF loading, further calculating the ratio of the SOF loading to the PM loading, and executing the step B by judging whether the PM loading is greater than or equal to a PM loading threshold (i.e. a first threshold) and whether the ratio is greater than or equal to a ratio threshold (i.e. a second threshold), and when the PM loading is greater than the PM loading threshold and the SOF mass ratio is greater than the ratio threshold, calculating by a state machine, outputting Output1 (Output 1) and Output2 (Output 2).

Wherein, if (input 1= 1) & & (input 2= 0) = 1, output1 = 1; if (input 1= =1) & (input 2= =1) = 1, then Output2 = 1, input1 (input 1) = =1 represents PM loading greater than or equal to the PM loading threshold, input2 (input 2) = =0 represents SOF mass ratio less than the ratio threshold, and input 2= 1 represents SOF mass ratio greater than the ratio threshold.

And (B) step (B): judging an Output result, if Output 1=1, executing step C, namely triggering DPF complete regeneration control; if Output 2=1, step D is performed, triggering DPF partial regeneration control.

Step C: the rotational speed and torque of the engine are input into an original DPF regeneration control module, an original thermal management T5 temperature target value 1 (600 ℃) and a demand duration 1 (40 minutes) are calculated, and DPF complete regeneration control is carried out based on the temperature target value 1 and the demand duration 1, wherein the DPF complete regeneration control comprises a pyrolysis process of SOF and a combustion process of carbon particles.

Step D: the exhaust gas temperature target value is obtained, a corresponding correction coefficient is determined in a lookup table (Map) based on the rotating speed and the torque, the product of the exhaust gas temperature target value and the correction coefficient is calculated to obtain a temperature target value 2 (namely a pyrolysis temperature target value), further, the corresponding required duration time 2 (namely pyrolysis time) is searched in the lookup table through the temperature target value 2 and the SOF loading amount, and DPF partial regeneration control, namely the pyrolysis process of the SOF, is carried out based on the thermal management T5 temperature target value 2 (400 ℃) and the required duration time 2 (30 minutes).

The DPF partial regeneration control method provided by the embodiment of the present application can be applied to the national sixth and the non-fourth products adopting the DPF technology and the national seventh emission control, and the embodiment of the present application does not specifically limit the application scenario.

In the foregoing embodiments, the DPF portion regeneration control method provided in the embodiment of the present application is described, and in order to implement each function in the method provided in the embodiment of the present application, the electronic device as the execution subject may include a hardware structure and/or a software module, and each function may be implemented in the form of a hardware structure, a software module, or a hardware structure plus a software module. Some of the functions described above are performed in a hardware configuration, a software module, or a combination of hardware and software modules, depending on the specific application of the solution and design constraints.

For example, fig. 8 is a schematic structural diagram of a DPF portion regeneration control device according to an embodiment of the present application, and as shown in fig. 8, the device includes: an acquisition module 810 and a processing module 820;

wherein the obtaining module 810 is configured to obtain a mass of a soluble organic matter SOF and a mass of particulate matter PM in a particulate matter supplemental collector DPF, and determine whether the mass of PM is greater than a first threshold, and whether a ratio of the mass of SOF to the mass of PM is greater than a second threshold;

The processing module 820 is configured to obtain a pyrolysis temperature target value of the SOF when the PM mass is greater than a first threshold and a ratio of the SOF mass to the PM mass is greater than a second threshold, and search a corresponding pyrolysis time by using the pyrolysis temperature target value and the SOF mass, and perform a pyrolysis process of the SOF based on the pyrolysis temperature target value and the pyrolysis time.

Optionally, the processing module 820 includes an acquisition unit, a calculation unit, and a processing unit;

specifically, the acquiring unit is used for acquiring an initial pyrolysis temperature target value and a correction coefficient of the SOF; the correction coefficient is used for correcting the pyrolysis temperature value of the SOF;

and the calculating unit is used for calculating the product of the initial pyrolysis temperature target value and the correction coefficient to obtain the pyrolysis temperature target value.

Optionally, the acquiring unit is specifically configured to:

Optionally, the processing unit is configured to:

Optionally, the device further includes a first judging module, where the first judging module is configured to:

if yes, determining that the pyrolysis process of the SOF is finished.

Optionally, the device further includes a second judging module, where the second judging module is configured to:

in the pyrolysis process of SOF, obtaining average pressure inside DPF;

if yes, determining that the pyrolysis process of the SOF is finished.

Optionally, the obtaining module 810 is configured to:

Optionally, the apparatus further comprises a regeneration module for:

performing a DPF regeneration process when the PM mass is greater than or equal to a first threshold and a ratio of the SOF mass to the PM mass is less than a second threshold; the DPF regeneration process includes a pyrolysis process of SOF and a combustion process of carbon particles.

The specific implementation principle and effect of the DPF partial regeneration control device provided in the embodiment of the present application may be referred to the relevant description and effect corresponding to the above embodiment, and will not be repeated here.

The embodiment of the application also provides a schematic structural diagram of an electronic device, and fig. 9 is a schematic structural diagram of an electronic device provided in the embodiment of the application, as shown in fig. 9, the electronic device may include: a processor 901 and a memory 902 communicatively coupled to the processor; the memory 902 stores a computer program; the processor 901 executes a computer program stored in the memory 902, such that the processor 901 performs the method described in any one of the embodiments above.

Wherein the memory 902 and the processor 901 may be connected by a bus 903.

Embodiments of the present application also provide a computer-readable storage medium storing computer program execution instructions that, when executed by a processor, are configured to implement a method as described in any of the foregoing embodiments of the present application.

The embodiment of the application also provides a chip for executing instructions, wherein the chip is used for executing the method in any of the previous embodiments executed by the electronic equipment in any of the previous embodiments of the application.

Embodiments of the present application also provide a computer program product comprising a computer program which, when executed by a processor, performs a method as described in any of the preceding embodiments of the present application, as performed by an electronic device.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules is merely a logical function division, and there may be additional divisions of actual implementation, e.g., multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.

The modules illustrated as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to implement the solution of this embodiment.

In addition, each functional module in each embodiment of the present application may be integrated in one processing unit, or each module may exist alone physically, or two or more modules may be integrated in one unit. The units formed by the modules can be realized in a form of hardware or a form of hardware and software functional units.

The integrated modules, which are implemented in the form of software functional modules, may be stored in a computer readable storage medium. The software functional modules described above are stored in a storage medium and include instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or processor to perform some of the steps of the methods described in various embodiments of the present application.

It should be appreciated that the processor may be a central processing unit (Central Processing Unit, CPU for short), other general purpose processors, digital signal processor (Digital Signal Processor, DSP for short), application specific integrated circuit (Application Specific Integrated Circuit, ASIC for short), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in a processor for execution.

The Memory may include a high-speed random access Memory (Random Access Memory, abbreviated as RAM), and may further include a Non-volatile Memory (NVM), such as at least one magnetic disk Memory, and may also be a U-disk, a removable hard disk, a read-only Memory, a magnetic disk, or an optical disk.

The bus may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (Peripheral Component Interconnect, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, the buses in the drawings of the present application are not limited to only one bus or one type of bus.

The storage medium may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random-Access Memory (SRAM), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read Only Memory, EEPROM), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an application specific integrated circuit (Application Specific Integrated Circuits, ASIC for short). It is also possible that the processor and the storage medium reside as discrete components in an electronic device or a master device.

The foregoing is merely a specific implementation of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the embodiments of the present application should be covered by the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. A DPF partial regeneration control method, characterized by comprising:

If yes, obtaining a pyrolysis temperature target value of the SOF, searching corresponding pyrolysis time by utilizing the pyrolysis temperature target value and the SOF quality, and carrying out a pyrolysis process of the SOF based on the pyrolysis temperature target value and the pyrolysis time, wherein the method comprises the following steps: searching corresponding pyrolysis time in a lookup table based on the pyrolysis temperature target value and the SOF quality; the pyrolysis time is used to control the duration of pyrolysis of the SOF;

carrying out a pyrolysis process on the SOF by using the searched pyrolysis time and the pyrolysis temperature target value, wherein the pyrolysis process is regeneration control of the SOF; wherein the pyrolysis time is a duration of pyrolysis based on a pyrolysis temperature target value, which is stored in a look-up table or in a controller; the lookup table stores pyrolysis temperature target values and corresponding relations between SOF quality and pyrolysis time;

obtaining a pyrolysis temperature target value for SOF, comprising:

obtaining an initial pyrolysis temperature target value and a correction coefficient of the SOF comprises the following steps: acquiring the rotating speed and the torque of an engine, and determining corresponding correction coefficients in a lookup table based on the rotating speed and the torque; wherein, the lookup table stores the corresponding relation between the rotating speed and the torque and the correction coefficient;

Determining an initial pyrolysis temperature target value based on the SOF mass; the correction coefficient is used for correcting the pyrolysis temperature value of the SOF; wherein the initial pyrolysis temperature target value is an exhaust gas temperature target value;

2. The method according to claim 1, wherein the method further comprises:

judging whether the average temperature is greater than or equal to the pyrolysis temperature target value and whether the duration is greater than or equal to the pyrolysis time; if yes, determining that the pyrolysis process of the SOF is finished.

3. The method according to claim 2, wherein the method further comprises:

in the pyrolysis process of SOF, obtaining average pressure inside DPF;

if yes, determining that the pyrolysis process of the SOF is finished.

4. The method of claim 1, wherein obtaining the mass of soluble organic matter SOF and the mass of particulate matter PM in the particulate matter supplemental collector DPF comprises:

5. The method according to any one of claims 1-4, further comprising:

6. A DPF partial regeneration control apparatus to which the DPF partial regeneration control method according to claim 1 is applied, characterized in that the apparatus includes:

7. An electronic device, comprising: a processor, a memory and a computer program; wherein the computer program is stored in the memory and configured to be executed by the processor, the computer program comprising instructions for performing the DPF partial regeneration control method according to any one of claims 1-5.

8. A computer readable storage medium storing computer executable instructions which when executed by a processor are adapted to implement the DPF partial regeneration control method according to any one of claims 1-5.