DPF active regeneration control method and device, storage medium and vehicle

文档序号：1857965 发布日期：2021-11-19 浏览：28次中文

阅读说明：本技术 Dpf主动再生的控制方法、装置、存储介质和车辆 (DPF active regeneration control method and device, storage medium and vehicle ) 是由孙铃董光雷杨春艳于 2021-09-30 设计创作，主要内容包括：本申请公开了一种DPF主动再生的控制方法、装置、存储介质和车辆,在检测到整车的废气体积流量大于预设流量阈值的情况下,确定颗粒捕捉器中产生积碳,并获取颗粒捕捉器的流阻数据。对各个流阻进行平均值计算,得到目标流阻。基于目标流阻,颗粒捕捉器执行主动再生的次数,以及预先构建的数据表中所示的流阻、与流阻对应的标定值对、标定值、与标定值对应的碳载量,确定目标碳载量。在目标碳载量大于预设碳载量阈值的情况下,控制颗粒捕捉器执行主动再生。当检测到颗粒捕捉器中止主动再生时,获取颗粒捕捉器的剩余碳载量,控制发动机喷射柴油,以使得颗粒捕捉器中增添有助燃剂,并控制颗粒捕捉器重启主动再生,以使得积碳和助燃剂均燃烧干净。(The application discloses a control method and device for DPF active regeneration, a storage medium and a vehicle. And calculating the average value of all the flow resistances to obtain the target flow resistance. The target carbon load is determined based on the target flow resistance, the number of times the particle trap performs active regeneration, and the flow resistance, the calibrated value pair corresponding to the flow resistance, the calibrated value, and the carbon load corresponding to the calibrated value shown in the pre-constructed data table. Controlling the particle trap to perform active regeneration in the event that the target carbon load is greater than a preset carbon load threshold. When the active regeneration of the particle catcher is detected to be stopped, the residual carbon loading of the particle catcher is obtained, the engine is controlled to spray diesel oil, so that a combustion-supporting agent is added into the particle catcher, the particle catcher is controlled to restart the active regeneration, and the carbon deposit and the combustion-supporting agent are completely combusted.)

1. A method of controlling active regeneration of a DPF, comprising:

under the condition that the volume flow of the exhaust gas of the whole vehicle is detected to be larger than a preset flow threshold value and the exhaust temperature of an engine is detected to be larger than a preset temperature threshold value, carbon deposition generated in a particle catcher is determined, and flow resistance data of the particle catcher in a preset time period are obtained; the flow resistance data comprises flow resistance at each moment;

calculating the average value of the flow resistance at each moment to obtain a target flow resistance;

determining a target carbon loading based on the target flow resistance, the number of times the particle trap performs active regeneration, and the flow resistance, a calibration value pair corresponding to the flow resistance, a calibration value, and a carbon loading corresponding to the calibration value shown in a pre-constructed data table;

controlling the particle trap to perform active regeneration when the target carbon load is greater than a preset carbon load threshold;

acquiring a remaining carbon load of the particle trap when it is detected that the particle trap ceases active regeneration;

under the conditions that the residual carbon capacity is detected to be not greater than a first preset threshold and greater than a second preset threshold, and the exhaust temperature is detected to be not greater than the preset temperature threshold, controlling the engine to inject diesel oil with preset dosage, so that a combustion adjuvant is added into the particle catcher, and controlling the particle catcher to restart active regeneration, so that the carbon deposit and the combustion adjuvant are completely combusted; the first preset threshold is smaller than the preset carbon loading threshold and larger than the second preset threshold.

2. The method of claim 1, wherein determining a target carbon load based on the target flow resistance, the number of times the particle trap performs active regeneration, and the flow resistance, a calibrated value pair corresponding to the flow resistance, a calibrated value, a carbon load corresponding to the calibrated value as shown in a pre-constructed data table comprises:

calculating the standard deviation of the flow resistance at each moment to obtain the standard deviation of the flow resistance;

judging whether the standard deviation of the flow resistance is smaller than a preset standard deviation threshold value or not;

and determining that the flow resistance data is valid under the condition that the flow resistance standard deviation is smaller than a preset standard deviation threshold value, and determining the target carbon loading amount based on the number of times of the active regeneration executed by the particle catcher, the flow resistance shown in a pre-constructed data table, the calibration value corresponding to the flow resistance, the calibration value and the carbon loading amount corresponding to the calibration value.

3. The method of claim 2, further comprising:

and under the condition that the standard deviation of the flow resistance is not less than the preset standard deviation threshold value, determining that the flow resistance data is invalid, and deleting the flow resistance data.

4. The method of claim 1, wherein the data table comprises a first data table and a second data table;

acquiring the times of executing active regeneration of the particle catcher, and judging whether the times is zero or not;

under the condition that the times are zero, inquiring and obtaining a calibration value pair corresponding to the target flow resistance from the first data table; the calibration value pair comprises a first calibration value and a second calibration value, and the first calibration value is larger than the second calibration value;

querying from the first data table to obtain the carbon loading capacity corresponding to the first calibration value and the carbon loading capacity corresponding to the second calibration value;

substituting the target flow resistance, the first calibration value, the second calibration value, the carbon loading capacity corresponding to the first calibration value and the carbon loading capacity corresponding to the second calibration value into a first preset formula, and calculating to obtain the target carbon loading capacity.

5. The method of claim 4, further comprising:

under the condition that the times are not zero, inquiring and obtaining a calibration value pair corresponding to the target flow resistance from the second data table; the calibration value pair comprises a third calibration value and a fourth calibration value, and the third calibration value is larger than the fourth calibration value;

querying and obtaining the carbon load capacity corresponding to the third calibration value and the carbon load capacity corresponding to the fourth calibration value from the second data table;

substituting the target flow resistance, the third calibration value, the fourth calibration value, the carbon loading capacity corresponding to the third calibration value and the carbon loading capacity corresponding to the fourth calibration value into a second preset formula, and calculating to obtain the target carbon loading capacity.

6. The method of claim 1, wherein after obtaining a remaining carbon load of the particle trap upon detecting that the particle trap ceases active regeneration, further comprising:

and controlling the particle catcher to restart the active regeneration under the condition that the residual carbon loading is larger than the first preset threshold value so as to enable the carbon deposit to be burnt completely.

7. The method of claim 1, wherein after obtaining a remaining carbon load of the particle trap upon detecting that the particle trap ceases active regeneration, further comprising:

prohibiting the particle trap to restart active regeneration within the preset time period if the remaining carbon load is not greater than the second preset threshold.

8. A control device for active regeneration of a DPF, comprising:

the device comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for determining that carbon deposition is generated in a particle catcher and acquiring flow resistance data of the particle catcher in a preset time period under the condition that the volume flow of exhaust gas of the whole vehicle is detected to be larger than a preset flow threshold value and the exhaust temperature of an engine is detected to be larger than a preset temperature threshold value; the flow resistance data comprises flow resistance at each moment;

the calculating unit is used for calculating the average value of the flow resistance at each moment to obtain a target flow resistance;

a determining unit, configured to determine a target carbon loading amount based on the target flow resistance, the number of times the particle trap performs active regeneration, and the flow resistance, a calibration value pair corresponding to the flow resistance, a calibration value, and a carbon loading amount corresponding to the calibration value shown in a pre-constructed data table;

a first control unit for controlling the particle trap to perform active regeneration if the target carbon load is greater than a preset carbon load threshold;

a second acquisition unit for acquiring a remaining carbon load of the particle trap when it is detected that the particle trap ceases active regeneration;

the second control unit is used for controlling the engine to inject diesel oil with preset dosage under the conditions that the residual carbon capacity is not larger than a first preset threshold and larger than a second preset threshold and the exhaust temperature is not larger than a preset temperature threshold, so that a combustion improver is added into the particle catcher, and the particle catcher is controlled to restart active regeneration, so that the carbon deposit and the combustion improver are completely combusted; the first preset threshold is smaller than the preset carbon loading threshold and larger than the second preset threshold.

9. A computer-readable storage medium characterized by comprising a stored program, wherein the program executes the control method of DPF active regeneration according to any one of claims 1-7.

10. A vehicle, characterized by comprising: a processor, a memory, and a bus; the processor and the memory are connected through the bus;

the memory is used for storing a program and the processor is used for running the program, wherein the program is run to execute the control method for DPF active regeneration as set forth in any one of claims 1-7.

Technical Field

The application relates to the technical field of automobiles, in particular to a control method and device for DPF active regeneration, a storage medium and a vehicle.

Background

In the field of automobile exhaust treatment, a particle trap (DPF) is commonly used to Filter most of the Particulate matters such as soot in the exhaust, but as the operation time of the engine increases, the weight of soot accumulation (carbon deposition for short) in the DPF also increases, which causes the exhaust back pressure to increase, and affects the dynamic property and fuel economy of the engine. In order to not affect the normal work of the engine, the DPF needs to be controlled to perform active regeneration, and the engine is enabled to inject Diesel oil through in-cylinder post injection or tail pipe post injection, so that the Diesel oil is oxidized in a Diesel Oxidation Catalyst (DOC) to release heat, the exhaust temperature is increased, carbon deposition is removed through combustion, and the function of the DPF is recovered.

Currently, the existing active regeneration control methods are: when the carbon loading of the DPF is detected to be larger than the preset carbon loading threshold value, the DPF is controlled to perform active regeneration so that carbon deposition in the DPF is combusted. However, with the existing control method, the DPF carrier is easily burned, and the working time of performing active regeneration on the DPF is long, so that it is difficult to remove the soot within a limited time.

Disclosure of Invention

The applicant found that: the main reason for burning the DPF carrier is that the carbon loading amount of the DPF is detected to be inaccurate (the detected carbon loading amount is far less than the weight of the carbon deposition actually existing in the DPF), so that the carbon deposition existing in the DPF is excessive, and high temperature is generated in the process of burning a large amount of carbon deposition, thereby burning the DPF carrier; in addition, the DPF is limited by the influence of the working condition of the whole vehicle, the DPF can be stopped and the active regeneration is restarted for multiple times, however, after the active regeneration is stopped each time, the DPF carrier can have residual carbon deposit, the residual carbon deposit is usually unevenly distributed in the DPF carrier and is difficult to support the next combustion, and the combustion improver is added in the DPF to promote the continuous combustion of the carbon deposit, so that the efficiency of burning out the carbon deposit can be accelerated, and the working time of the active regeneration is shortened.

The application provides a control method and device for DPF active regeneration, a storage medium and a vehicle, and aims to shorten the working time of DPF to perform active regeneration under the condition of ensuring that a DPF carrier is not burnt.

In order to achieve the above object, the present application provides the following technical solutions:

a method of controlling active regeneration of a DPF, comprising:

calculating the average value of the flow resistance at each moment to obtain a target flow resistance;

controlling the particle trap to perform active regeneration when the target carbon load is greater than a preset carbon load threshold;

acquiring a remaining carbon load of the particle trap when it is detected that the particle trap ceases active regeneration;

Optionally, the determining, based on the target flow resistance, the number of times the particle trap performs active regeneration, and the flow resistance, the calibration value pair corresponding to the flow resistance, the calibration value, and the carbon loading corresponding to the calibration value shown in a pre-constructed data table, the target carbon loading includes:

calculating the standard deviation of the flow resistance at each moment to obtain the standard deviation of the flow resistance;

judging whether the standard deviation of the flow resistance is smaller than a preset standard deviation threshold value or not;

Optionally, the method further includes:

Optionally, the data table includes a first data table and a second data table;

acquiring the times of executing active regeneration of the particle catcher, and judging whether the times is zero or not;

querying from the first data table to obtain the carbon loading capacity corresponding to the first calibration value and the carbon loading capacity corresponding to the second calibration value;

Optionally, the method further includes:

querying and obtaining the carbon load capacity corresponding to the third calibration value and the carbon load capacity corresponding to the fourth calibration value from the second data table;

Optionally, after acquiring the remaining carbon load of the particle trap when it is detected that the particle trap suspends the active regeneration, the method further includes:

prohibiting the particle trap to restart active regeneration within the preset time period if the remaining carbon load is not greater than the second preset threshold.

A control device for active regeneration of a DPF comprising:

the calculating unit is used for calculating the average value of the flow resistance at each moment to obtain a target flow resistance;

a first control unit for controlling the particle trap to perform active regeneration if the target carbon load is greater than a preset carbon load threshold;

a second acquisition unit for acquiring a remaining carbon load of the particle trap when it is detected that the particle trap ceases active regeneration;

A computer-readable storage medium including a stored program, wherein the program executes the control method of DPF active regeneration.

A vehicle, comprising: a processor, a memory, and a bus; the processor and the memory are connected through the bus;

the memory is used for storing programs, and the processor is used for running the programs, wherein the programs are run to execute the control method of DPF active regeneration.

According to the technical scheme, carbon deposition is generated in the particle catcher under the conditions that the volume flow of the exhaust gas of the whole vehicle is detected to be larger than a preset flow threshold value and the exhaust temperature of the engine is larger than a preset temperature threshold value, and flow resistance data of the particle catcher in a preset time period is acquired. And calculating the average value of the flow resistance at each moment to obtain the target flow resistance. The target carbon load is determined based on the target flow resistance, the number of times the particle trap performs active regeneration, and the flow resistance, the calibrated value pair corresponding to the flow resistance, the calibrated value, and the carbon load corresponding to the calibrated value shown in the pre-constructed data table. Controlling the particle trap to perform active regeneration in the event that the target carbon load is greater than a preset carbon load threshold. When it is detected that the particle trap ceases active regeneration, the remaining carbon load of the particle trap is obtained. And under the conditions that the residual carbon capacity is not greater than a first preset threshold value and greater than a second preset threshold value and the exhaust temperature is not greater than a preset temperature threshold value, controlling the engine to inject diesel oil with preset dosage, so that a combustion adjuvant is added into the particle catcher, and controlling the particle catcher to restart active regeneration, so that the carbon deposit and the combustion adjuvant are completely combusted. Compared with the carbon loading amount detected in the prior art, the target carbon loading amount is more matched with the weight of the carbon deposition actually existing in the DPF based on the target flow resistance, the number of times of executing active regeneration of the DPF and the data shown in the data table as reference basis, so that the burning-out phenomenon of the DPF carrier caused by excessive carbon deposition is avoided. In addition, under the conditions that the residual carbon loading of the DPF is greater than a second preset threshold and less than a first preset threshold and the exhaust temperature of the engine is not greater than a preset temperature threshold, combustion of the carbon deposit is accelerated by means of the combustion improver, and the working time of active regeneration can be effectively shortened. Therefore, by the scheme shown in the application, the working time of the DPF to perform active regeneration can be shortened under the condition that the DPF carrier is not burnt.

Drawings

In order to more clearly illustrate the embodiments of the present application 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 some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram illustrating a variation of a pressure difference of a DPF according to an embodiment of the present disclosure;

FIG. 2a is a schematic diagram of a control method for DPF active regeneration according to an embodiment of the present disclosure;

FIG. 2b is a schematic illustration of a carbon loading variation provided in an embodiment of the present application;

FIG. 2c is a schematic representation of another carbon loading variation provided in the examples of the present application;

FIG. 2d is a schematic representation of another variation in carbon loading provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of another control method for DPF active regeneration according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a control device for DPF active regeneration according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

It should be noted that, by analyzing the monitoring data of the whole vehicle (as shown in fig. 1, specifically, the variation of the DPF differential pressure with the running time of the whole vehicle), the applicant found that: during the process of executing the working condition by the engine, the inner wall pores of the DPF carrier generate soot, so that the permeability of the DPF carrier is deteriorated, which causes a rapid increase of the DPF differential pressure, after the DPF performs the first active regeneration, the soot is burned out to form ash, the ash will continue to remain in the inner wall pores of the DPF carrier, the ash has a higher loose permeability compared to the soot, for this reason, the DPF differential pressure when the DPF performs the active regeneration again will appear smaller compared to the DPF differential pressure when the DPF performs the active regeneration for the first time, the existing method for detecting the DPF soot loading amount generally calculates based on the DPF differential pressure (usually calculates the soot loading amount by using the flow resistance associated with the DPF differential pressure and the waste volume flow), so that the soot loading amount calculated based on the DPF differential pressure is much smaller than the weight of the soot actually existing in the DPF, when it is detected that the soot loading amount of the DPF is larger than the preset carbon threshold (that is when the active regeneration condition is reached), the weight of the soot actually present in the DPF is much greater than the detected soot loading, and therefore, when the DPF is controlled to perform active regeneration, a large amount of soot in the DPF will burn to generate high temperature, burning the DPF carrier.

To this end, the inventors concluded that: in order to avoid the mismatch between the detected amount of carbon in the DPF and the weight of soot actually present in the DPF, it is necessary to correct the detected amount of carbon in accordance with the number of times the DPF performs active regeneration (i.e., to distinguish whether the DPF has performed active regeneration).

In the embodiment of the application, through simulating a scene that the DPF does not perform active regeneration, each flow resistance of the DPF under different actual carbon loading amounts (namely, the weight of carbon deposition actually existing in the DPF) is measured in advance, statistical analysis is performed on each flow resistance, a calibration value pair (including two calibration values for correcting the flow resistance) corresponding to each flow resistance is obtained, the carbon loading amount corresponding to each calibration value is obtained through measurement, and a first data table is constructed according to the flow resistance, the calibration value pair, the calibration values and the carbon loading amount corresponding to the calibration values.

Similarly, by simulating the scene that the DPF has performed active regeneration, measuring in advance to obtain each flow resistance of the DPF under different actual carbon loading amounts, performing statistical analysis on each flow resistance to obtain a calibration value pair corresponding to each flow resistance, measuring to obtain the carbon loading amount corresponding to each calibration value, and constructing a second data table according to the flow resistance, the calibration value pair, the calibration value and the carbon loading amount corresponding to the calibration value.

Generally speaking, the monitoring data of the whole vehicle includes the number and execution time of the DPF to perform the active regeneration during the running process of the whole vehicle, and the DPF differential pressure and the exhaust gas volume flow at each moment. During the running of the whole vehicle, an Electronic Control Unit (ECU) of the vehicle records the occurrence times and the occurrence time of the active regeneration, and the DPF differential pressure and the exhaust gas volume flow at each moment in real time. The DPF differential pressure refers to a pressure difference between the DPF outlet and the DPF inlet, and is acquired by a pressure sensor preset in the DPF. The exhaust gas volume flow rate is a volume of exhaust gas passing through the DPF per unit time, and is calculated based on an intake pressure and a temperature of the engine.

As shown in fig. 2a, a schematic diagram of a control method for DPF active regeneration according to an embodiment of the present application includes the following steps:

s201: and under the conditions that the volume flow of the exhaust gas of the whole vehicle is detected to be larger than a preset flow threshold value and the exhaust temperature of the engine is detected to be larger than a preset temperature threshold value, the carbon deposition generated in the DPF is determined, and the flow resistance data of the DPF in a preset time period is obtained.

The flow resistance data comprises flow resistance at each moment, the flow resistance at each moment is calculated based on DPF pressure difference and exhaust gas volume flow at each moment, and specifically, the flow resistance is the ratio of the DPF pressure difference to the exhaust gas volume flow. Generally, the DPF differential pressure and the exhaust gas volume flow at each moment are recorded in real time by an ECU of the entire vehicle.

S202: and calculating the average value of the flow resistance at each moment to obtain the target flow resistance.

Wherein, the carbon loading is calculated by utilizing the target flow resistance, and the calculation result is more accurate and reliable.

S203: and calculating the standard deviation of the flow resistance at each moment to obtain the standard deviation of the flow resistance.

S204: and judging whether the standard deviation of the flow resistance is smaller than a preset standard deviation threshold value or not.

If the standard deviation of the flow resistance is smaller than the preset standard deviation threshold value, executing S205, otherwise executing S206.

S205: and determining that the flow resistance data in a preset time period is valid, acquiring the times of executing active regeneration of the DPF, and judging whether the times are zero or not.

If the number of times is zero, S207 is executed, otherwise S210 is executed.

The ECU of the whole vehicle records the number of times of executing the active regeneration by the DPF, if the number of times is zero, the DPF is determined not to execute the active regeneration, and if the number of times is not zero, the DPF is determined to execute the active regeneration.

It should be noted that, if the standard deviation of the flow resistance is smaller than the preset standard deviation threshold, it is determined that the flow resistance data in the preset time period is valid, which indicates that the carbon loading amount calculated by using the flow resistance data in the preset time period is reasonable and reliable.

S206: and determining that the flow resistance data is invalid, and deleting the flow resistance data.

If the standard deviation of the flow resistance is smaller than the preset standard deviation threshold value, determining that the flow resistance data in the preset time period is invalid, indicating that the accurate carbon loading capacity cannot be calculated by using the flow resistance data in the preset time period, and deleting the flow resistance data in the preset time period to avoid calculation errors.

S207: and inquiring the first data table to obtain a calibration value pair corresponding to the target flow resistance.

The calibration value pair comprises a first calibration value and a second calibration value, and the first calibration value is larger than the second calibration value.

S208: the carbon load corresponding to the first calibration value and the carbon load corresponding to the second calibration value are obtained by inquiring from the first data table.

S209: substituting the target flow resistance, the first calibration value, the second calibration value, the carbon loading amount corresponding to the first calibration value and the carbon loading amount corresponding to the second calibration value into a first preset formula, and calculating to obtain the target carbon loading amount.

After execution of S209, execution continues with S213.

Wherein, the first preset formula is shown as formula (1).

m1+(m2-m1)*(μ-μ1)/(μ2-μ1) (1)

In equation (1), m1 represents the carbon loading corresponding to a first calibration, m2 represents the carbon loading corresponding to a second calibration, μ represents the target flow resistance, μ 1 represents the first calibration, and μ 2 represents the second calibration.

S210: and inquiring from the second data table to obtain a calibration value pair corresponding to the target flow resistance.

The calibration value pair comprises a third calibration value and a fourth calibration value, and the third calibration value is larger than the fourth calibration value.

S211: and querying from the second data table to obtain the carbon load corresponding to the third calibration value and the carbon load corresponding to the fourth calibration value.

S212: substituting the target flow resistance, the third calibration value, the fourth calibration value, the carbon loading amount corresponding to the third calibration value and the carbon loading amount corresponding to the fourth calibration value into a second preset formula, and calculating to obtain the target carbon loading amount.

After performing S212, execution continues with S213.

Wherein the second preset formula is shown as formula (2).

m3+(m4-m3)*(μ-μ3)/(μ4-μ3) (2)

In equation (2), m3 represents the carbon loading corresponding to the third calibration, m4 represents the carbon loading corresponding to the fourth calibration, μ represents the target flow resistance, μ 3 represents the third calibration, and μ 4 represents the fourth calibration.

S213: and controlling the DPF to perform active regeneration under the condition that the target carbon loading is larger than a preset carbon loading threshold value.

Wherein, when the target carbon loading is greater than the preset carbon loading threshold, it indicates that the DPF meets the condition for triggering the active regeneration.

S214: when the DPF is detected to stop active regeneration, the residual carbon loading of the DPF is obtained, and whether the residual carbon loading is larger than a first preset threshold value or not is judged.

If the remaining carbon load is greater than the first preset threshold, S215 is performed, otherwise S216 is performed.

Wherein the first preset threshold is less than the preset carbon loading threshold.

Generally, when the DPF is detected to cease active regeneration, it indicates that the remaining carbon loading is less than the preset carbon loading threshold.

S215: and controlling the DPF to restart the active regeneration so as to enable the soot to be burnt cleanly.

The loading amount of the residual carbon is greater than the first preset threshold value, which indicates that the carbon deposition in the DPF is excessive, so that the DPF needs to be controlled to restart the active regeneration to burn off the residual carbon deposition.

Specifically, under the condition that the residual carbon loading is greater than the first preset threshold, the DPF is controlled to restart the active regeneration so that the soot is burnt out, and the carbon loading corresponding to the process is changed as shown in fig. 2 b.

S216: and judging whether the residual carbon loading is larger than a second preset threshold value.

If the remaining carbon capacity is greater than the second predetermined threshold, S217 is performed, otherwise S218 is performed.

The first preset threshold is larger than the second preset threshold.

S217: and under the condition that the exhaust temperature of the engine is detected to be not more than a preset temperature threshold value, controlling the engine to inject diesel oil with preset dosage so as to add a combustion improver into the DPF, and controlling the DPF to restart active regeneration so as to enable the carbon deposit and the combustion improver to be completely combusted.

The residual carbon loading is greater than the second preset threshold and not greater than the first preset threshold, and the exhaust temperature of the engine is not greater than the preset temperature threshold, which both indicate that carbon deposition still remains in the DPF (the remaining carbon deposition is usually unevenly distributed in the DPF carrier), and the remaining carbon deposition is usually difficult to be sufficiently burnt, and a combustion improver needs to be added to assist in burning the carbon deposition, so that the carbon deposition is completely eliminated.

In the embodiment of the application, under the condition that the exhaust temperature of the engine is detected to be not more than the preset temperature threshold value, the engine is controlled to inject the diesel Oil with the preset dosage, so that Soluble organic matters (SOF) can be added into the DPF, the SOF has the functions of igniting and supporting combustion, the combustion of the carbon deposit can be promoted, the combustion efficiency of the carbon deposit is accelerated, and the working time of active regeneration is shortened.

Specifically, under the condition that the residual carbon loading is greater than a second preset threshold and not greater than a first preset threshold, the engine is controlled to inject lubricating oil with a preset volume, so that a combustion improver is added into the DPF, the DPF is controlled to restart to perform active regeneration, so that carbon deposition and the combustion improver are completely combusted, and the carbon loading change corresponding to the process is shown in fig. 2 c.

S218: the DPF is prohibited from restarting active regeneration for a preset period of time.

The residual carbon loading is not greater than the second preset threshold, which indicates that the carbon deposition in the DPF is less and does not affect the permeability of the DPF carrier, i.e., the use of the normal function of the DPF is not affected, and the carbon deposition does not need to be burned, so that the DPF needs to be prohibited from restarting the active regeneration within a preset time period, and thus the DPF is prevented from executing invalid work.

Specifically, in the case where the remaining carbon loading is not greater than the second preset threshold, the DPF is prohibited from restarting active regeneration within a preset time period, and the carbon loading corresponding to this process is changed as shown in fig. 2 d.

In summary, based on the target flow resistance, the standard deviation of the flow resistance, the number of times of performing the active regeneration of the DPF, the first data table and the second data table as reference bases, the determined target carbon loading amount is more matched with the weight of the carbon deposit actually existing in the DPF compared with the carbon loading amount detected in the prior art, so as to avoid the burning-out phenomenon of the DPF carrier caused by excessive carbon deposit. In addition, under the conditions that the residual carbon loading of the DPF is greater than a second preset threshold and less than a first preset threshold and the exhaust temperature of the engine is not greater than a preset temperature threshold, the engine is controlled to inject diesel oil with preset dosage, so that a combustion improver is added into the particle catcher, the particle catcher is controlled to restart active regeneration, the carbon deposit and the combustion improver are completely combusted, combustion of the carbon deposit is accelerated by means of the combustion improver, and the working time of the active regeneration can be effectively shortened. Therefore, by the scheme shown in the embodiment, the working time of the DPF for executing active regeneration can be shortened under the condition of ensuring that the DPF carrier is not burnt.

It should be noted that, in the above embodiment, reference is made to S203, which is an alternative implementation manner of the control method for DPF active regeneration shown in this application. In addition, S218 mentioned in the above embodiment is also an alternative implementation of the control method for DPF active regeneration shown in this application. For this purpose, the flow shown in the above embodiment can be summarized as the method shown in fig. 3.

As shown in fig. 3, a schematic diagram of another control method for DPF active regeneration provided in the embodiment of the present application includes the following steps:

s301: and under the conditions that the volume flow of the exhaust gas of the whole vehicle is detected to be larger than a preset flow threshold value and the exhaust temperature of the engine is detected to be larger than a preset temperature threshold value, the carbon deposition generated in the particle catcher is determined, and the flow resistance data of the particle catcher in a preset time period is obtained.

Wherein the flow resistance data comprises flow resistance at each time.

S302: and calculating the average value of the flow resistance at each moment to obtain the target flow resistance.

S303: the target carbon load is determined based on the target flow resistance, the number of times the particle trap performs active regeneration, and the flow resistance, the calibrated value pair corresponding to the flow resistance, the calibrated value, and the carbon load corresponding to the calibrated value shown in the pre-constructed data table.

The first data table and the second data table mentioned in the above embodiments are all a specific expression form of the data table described in this embodiment. In addition, the first calibration value, the second calibration value, the third calibration value, and the fourth calibration value mentioned in the above embodiments are all a specific representation form of the data table described in this embodiment.

S304: controlling the particle trap to perform active regeneration in the event that the target carbon load is greater than a preset carbon load threshold.

S305: when it is detected that the particle trap ceases active regeneration, the remaining carbon load of the particle trap is obtained.

S306: and under the conditions that the residual carbon capacity is not greater than a first preset threshold value and greater than a second preset threshold value and the exhaust temperature is not greater than a preset temperature threshold value, controlling the engine to inject diesel oil with preset dosage, so that a combustion adjuvant is added into the particle catcher, and controlling the particle catcher to restart active regeneration, so that the carbon deposit and the combustion adjuvant are completely combusted.

The first preset threshold is smaller than a preset carbon loading threshold and larger than a second preset threshold.

In summary, based on the target flow resistance, the number of times that the DPF performs the active regeneration, and the data shown in the data table as reference bases, the determined target carbon loading amount is more matched with the weight of the carbon deposition actually existing in the DPF compared with the carbon loading amount detected in the prior art, so as to avoid the occurrence of the DPF carrier burnout phenomenon caused by excessive carbon deposition. In addition, under the conditions that the residual carbon loading of the DPF is greater than a second preset threshold and less than a first preset threshold and the exhaust temperature of the engine is not greater than a preset temperature threshold, combustion of the carbon deposit is accelerated by means of the combustion improver, and the working time of active regeneration can be effectively shortened. Therefore, by the scheme shown in the embodiment, the working time of the DPF for executing active regeneration can be shortened under the condition of ensuring that the DPF carrier is not burnt.

Corresponding to the control method for DPF active regeneration provided by the embodiments of the present application, the embodiments of the present application also provide a control device for DPF active regeneration.

As shown in fig. 4, a schematic structural diagram of a control device for DPF active regeneration according to an embodiment of the present application includes:

the first obtaining unit 100 is configured to determine that carbon deposition is generated in the particle trap and obtain flow resistance data of the particle trap within a preset time period when it is detected that the volume flow of exhaust gas of the entire vehicle is greater than a preset flow threshold and the exhaust temperature of the engine is greater than a preset temperature threshold; the flow resistance data includes flow resistance at each time.

And the calculating unit 200 is used for calculating the average value of the flow resistance at each moment to obtain the target flow resistance.

A determining unit 300 for determining a target carbon loading based on the target flow resistance, the number of times the particle trap performs the active regeneration, and the flow resistance, the calibration value pair corresponding to the flow resistance, the calibration value, the carbon loading corresponding to the calibration value, which are shown in the pre-constructed data table.

The determining unit 300 is specifically configured to: calculating the standard deviation of the flow resistance at each moment to obtain the standard deviation of the flow resistance; judging whether the standard deviation of the flow resistance is smaller than a preset standard deviation threshold value or not; and determining that the flow resistance data is valid under the condition that the standard deviation of the flow resistance is smaller than a preset standard deviation threshold value, and determining the target carbon loading amount based on the target flow resistance, the number of times of executing active regeneration by the particle catcher, the flow resistance shown in a pre-constructed data table, the calibration value corresponding to the flow resistance, the calibration value and the carbon loading amount corresponding to the calibration value.

The determination unit 300 is further configured to: and under the condition that the standard deviation of the flow resistance is not less than a preset standard deviation threshold value, determining that the flow resistance data is invalid, and deleting the flow resistance data.

In an embodiment of the present application, the data table includes a first data table and a second data table.

The determining unit 300 is specifically configured to: acquiring the times of executing active regeneration of the particle catcher, and judging whether the times are zero or not; under the condition that the times are zero, inquiring and obtaining a calibration value pair corresponding to the target flow resistance from the first data table; the calibration value pair comprises a first calibration value and a second calibration value, and the first calibration value is larger than the second calibration value; inquiring and acquiring the carbon load amount corresponding to the first calibration value and the carbon load amount corresponding to the second calibration value from the first data table; substituting the target flow resistance, the first calibration value, the second calibration value, the carbon loading amount corresponding to the first calibration value and the carbon loading amount corresponding to the second calibration value into a first preset formula, and calculating to obtain the target carbon loading amount.

The determination unit 300 is further configured to: under the condition that the times are not zero, inquiring and obtaining a calibration value pair corresponding to the target flow resistance from a second data table; the calibration value pair comprises a third calibration value and a fourth calibration value, and the third calibration value is larger than the fourth calibration value; inquiring and acquiring the carbon loading capacity corresponding to the third calibration value and the carbon loading capacity corresponding to the fourth calibration value from the second data table; substituting the target flow resistance, the third calibration value, the fourth calibration value, the carbon loading amount corresponding to the third calibration value and the carbon loading amount corresponding to the fourth calibration value into a second preset formula, and calculating to obtain the target carbon loading amount.

A first control unit 400 for controlling the particle trap to perform active regeneration in case the target carbon load is greater than a preset carbon load threshold.

A second acquisition unit 500 for acquiring a remaining carbon load of the particle trap when it is detected that the particle trap ceases active regeneration.

The second control unit 600 is configured to, when it is detected that the residual carbon loading is not greater than the first preset threshold and greater than the second preset threshold, and the exhaust temperature is not greater than the preset temperature threshold, control the engine to inject diesel oil with a preset dose, so that a combustion improver is added to the particle trap, and control the particle trap to restart active regeneration, so that carbon deposition and the combustion improver are completely combusted; the first preset threshold is less than a preset carbon loading threshold and greater than a second preset threshold.

A third control unit 700 for controlling the particle trap to restart the active regeneration so that the soot burns out completely, if the remaining carbon loading is greater than the first preset threshold.

The fourth control unit 800 prohibits the particle trap from restarting the active regeneration within a preset time period, in case the remaining carbon load is not greater than the second preset threshold.

The present application also provides a computer-readable storage medium including a stored program, wherein the program executes the control method for DPF active regeneration provided by the present application.

The present application further provides a vehicle, comprising: a processor, a memory, and a bus. The processor is connected with the memory through a bus, the memory is used for storing programs, the processor is used for running the programs, and when the programs are run, the control method for the DPF active regeneration provided by the application is executed, and the control method comprises the following steps:

calculating the average value of the flow resistance at each moment to obtain a target flow resistance;

controlling the particle trap to perform active regeneration when the target carbon load is greater than a preset carbon load threshold;

acquiring a remaining carbon load of the particle trap when it is detected that the particle trap ceases active regeneration;

calculating the standard deviation of the flow resistance at each moment to obtain the standard deviation of the flow resistance;

judging whether the standard deviation of the flow resistance is smaller than a preset standard deviation threshold value or not;

Optionally, the method further includes:

Optionally, the data table includes a first data table and a second data table;

acquiring the times of executing active regeneration of the particle catcher, and judging whether the times is zero or not;

querying from the first data table to obtain the carbon loading capacity corresponding to the first calibration value and the carbon loading capacity corresponding to the second calibration value;

Optionally, the method further includes:

querying and obtaining the carbon load capacity corresponding to the third calibration value and the carbon load capacity corresponding to the fourth calibration value from the second data table;

Optionally, after acquiring the remaining carbon load of the particle trap when it is detected that the particle trap suspends the active regeneration, the method further includes:

prohibiting the particle trap to restart active regeneration within the preset time period if the remaining carbon load is not greater than the second preset threshold.

The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. 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 application. Thus, the present application 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.

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DPF active regeneration control method and device, storage medium and vehicle

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