Method and device for determining carbon loading capacity of DPF model and electronic equipment

Abstract

The invention discloses a method and device for determining the carbon loading capacity of a DPF model and electronic device.The method comprises the steps that under the condition that it is determined that far back injection is started, the first DOC rear NO2 ratio corresponding to the current DOC temperature and the current DOC air speed is determined in a first preset corresponding relation, then the first passive regeneration carbon elimination amount is calculated based on the first DOC rear NO2 ratio, and the first passive regeneration carbon elimination amount is calculated based on the first passive regeneration carbon elimination amount; and based on the carbon deposition amount, the first passive regeneration carbon elimination amount and the active regeneration carbon elimination amount, a first DPF model carbon loading amount increase value is calculated, and finally the sum value of the current DPF model carbon loading amount and the first DPF model carbon loading amount increase value serves as the target DPF model carbon loading amount. Due to the fact that the first passive regeneration carbon elimination amount is calculated based on the NO2 ratio after the first DOC corresponding to the current DOC temperature and the current DOC air speed, compared with the mode that the passive regeneration carbon elimination amount is calculated through the theoretical NO2 ratio, the precision of the carbon loading amount of the DPF model can be improved, and the probability that the DPF is blocked or burnt down is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust gas post-treatment, and in particular to a method, a device and an electronic device for determining the carbon load of a DPF model. Background Art

[0002] Direct exhaust emissions from diesel engines can cause significant air pollution. Existing technologies usually use DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter) and SCR (Selective Catalytic Reduction) catalysts to sequentially treat the exhaust to reduce the content of pollutants in the exhaust.

[0003] At present, during the DPF regeneration process, diesel injection is performed by remote post-injection. Diesel will be oxidized and burned in the DOC, thereby increasing the temperature of the DPF. The diesel injected during the regeneration process will affect the conversion efficiency of NO2 (nitrogen dioxide) in the DOC, seriously affecting the reaction of NO2 and C (carbon), resulting in a decrease in the proportion of NO2 in the DOC. The decrease in the proportion of NO2 in the DOC causes the actual NO2 proportion to be lower than the theoretical NO2 proportion, thereby making the actual passive regeneration carbon elimination less than the passive regeneration carbon elimination calculated based on the theoretical NO2 proportion, ultimately causing the actual carbon load in the DPF to be higher than the model carbon load calculated by the DPF carbon load model, which can easily lead to problems such as DPF clogging or burning. Summary of the invention

[0004] The present invention provides a method, device and electronic device for determining the carbon load of a DPF model, so as to solve the problem in the prior art that the carbon load model value is lower than the actual carbon load due to the decrease in the proportion of NO2 in DOC, thereby causing DPF to be blocked or burned.

[0005] In a first aspect, the present application provides a method for determining the carbon load of a DPF model, the method comprising: When it is determined to start the remote post-injection, in the first preset correspondence, the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined; Calculating the first passive regeneration carbon removal amount based on the first post-DOC NO2 percentage value; Calculating a first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount, and the active regeneration carbon removal amount; The sum of the current DPF model carbon load and the first DPF model carbon load increase value is used as the target DPF model carbon load.

[0006] In a possible implementation, the calculating of the first passive regeneration carbon removal amount based on the first post-DOC NO2 ratio value includes: Calculating a first passive regeneration carbon removal rate based on the first post-DOC NO2 percentage value; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0007] In a possible implementation, the calculating of the first passive regeneration carbon removal amount based on the first post-DOC NO2 ratio value includes: In the second preset corresponding relationship, determining a second post-DOC NO2 percentage value corresponding to the current DOC temperature and the current DOC airspeed; Calculating a correction factor based on the second post-DOC NO2 percentage value and the first post-DOC NO2 percentage value; The first passive regeneration carbon removal amount is calculated based on the second passive regeneration carbon removal rate and the correction factor, wherein the second passive regeneration carbon removal rate is calculated based on the second post-DOC NO2 proportion value.

[0008] In a possible implementation, the calculating of the correction factor based on the second post-DOC NO2 percentage value and the first post-DOC NO2 percentage value includes: Calculate the ratio of the first post-DOC NO2 percentage value to the second post-DOC NO2 percentage value; The calculated ratio is used as the correction factor.

[0009] In a possible implementation, the calculating the first passive regeneration carbon removal amount based on the second passive regeneration carbon removal rate and the correction factor includes: The product of the second passive regeneration carbon removal rate and the correction factor is used as the first passive regeneration carbon removal rate; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0010] In a possible implementation, the calculating the first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount, and the active regeneration carbon removal amount includes: Calculating a first difference between the carbon deposit amount and the first passive regeneration carbon removal amount; The first difference and the second difference between the active regeneration carbon removal amount are used as the first DPF model carbon load increase value.

[0011] In a possible implementation, the method further includes: When it is determined that the remote post-injection is not turned on, in a second preset correspondence, a second post-DOC NO2 ratio value corresponding to the current DOC temperature and the current DOC airspeed is determined; Calculating the second passive regeneration carbon removal amount based on the second post-DOC NO2 percentage value; Calculating a second DPF model carbon load increase value based on the carbon deposit amount, the second passive regeneration carbon removal amount, and the active regeneration carbon removal amount; The sum of the current DPF model carbon load and the second DPF model carbon load increase value is used as the target DPF model carbon load.

[0012] In a possible implementation, the calculating of the second passive regeneration carbon removal amount based on the second post-DOC NO2 ratio value includes: Calculating the second passive regeneration carbon removal rate based on the second post-DOC NO2 percentage value; The product of the second passive regeneration carbon removal rate and the preset time length is used as the second passive regeneration carbon removal amount.

[0013] In a second aspect, the present application also provides a device for determining the carbon loading of a DPF model, comprising: A determination module, for determining, in a first preset correspondence relationship, a first post-DOC NO2 ratio value corresponding to a current DOC temperature and a current DOC airspeed when it is determined that the remote post-injection is turned on; A calculation module is used to calculate the first passive regeneration carbon removal amount based on the first post-DOC NO2 proportion value; calculate the first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount and the active regeneration carbon removal amount; and use the sum of the current DPF model carbon load and the first DPF model carbon load increase value as the target DPF model carbon load.

[0014] In a possible implementation manner, the calculation module is specifically used to: Calculating a first passive regeneration carbon removal rate based on the first post-DOC NO2 percentage value; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0015] In a possible implementation manner, the calculation module is specifically used to: In the second preset corresponding relationship, determining a second post-DOC NO2 percentage value corresponding to the current DOC temperature and the current DOC airspeed; Calculating a correction factor based on the second post-DOC NO2 percentage value and the first post-DOC NO2 percentage value; The first passive regeneration carbon removal amount is calculated based on the second passive regeneration carbon removal rate and the correction factor, wherein the second passive regeneration carbon removal rate is calculated based on the second post-DOC NO2 proportion value.

[0016] In a possible implementation manner, the calculation module is specifically used to: Calculate the ratio of the first post-DOC NO2 percentage value to the second post-DOC NO2 percentage value; The calculated ratio is used as the correction factor.

[0017] In a possible implementation manner, the calculation module is specifically used to: The product of the second passive regeneration carbon removal rate and the correction factor is used as the first passive regeneration carbon removal rate; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0018] In a possible implementation manner, the calculation module is specifically used to: Calculating a first difference between the carbon deposit amount and the first passive regeneration carbon removal amount; The first difference and the second difference between the active regeneration carbon removal amount are used as the first DPF model carbon load increase value.

[0019] In a possible implementation manner, the determining module is further configured to: When it is determined that the remote post-injection is not turned on, in a second preset correspondence, a second post-DOC NO2 ratio value corresponding to the current DOC temperature and the current DOC airspeed is determined; The calculation module is also used for: Based on the second post-DOC NO2 proportion value, the second passive regeneration carbon removal amount is calculated; based on the carbon deposit amount, the second passive regeneration carbon removal amount and the active regeneration carbon removal amount, the second DPF model carbon load increase value is calculated; the sum of the current DPF model carbon load and the second DPF model carbon load increase value is used as the target DPF model carbon load.

[0020] In a possible implementation manner, the calculation module is specifically used to: Calculating the second passive regeneration carbon removal rate based on the second post-DOC NO2 percentage value; The product of the second passive regeneration carbon removal rate and the preset time length is used as the second passive regeneration carbon removal amount.

[0021] In a third aspect, the present application further provides an electronic device, including: Memory, used to store computer programs; The processor is used to implement the following steps when executing the computer program stored in the memory: When it is determined to start the remote post-injection, in the first preset correspondence, the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined; Calculating the first passive regeneration carbon removal amount based on the first post-DOC NO2 percentage value; Calculating a first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount, and the active regeneration carbon removal amount; The sum of the current DPF model carbon load and the first DPF model carbon load increase value is used as the target DPF model carbon load.

[0022] In a possible implementation manner, the processor is specifically configured to: Calculating a first passive regeneration carbon removal rate based on the first post-DOC NO2 percentage value; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0023] In a possible implementation manner, the processor is specifically configured to: In the second preset corresponding relationship, determining a second post-DOC NO2 percentage value corresponding to the current DOC temperature and the current DOC airspeed; Calculating a correction factor based on the second post-DOC NO2 percentage value and the first post-DOC NO2 percentage value; The first passive regeneration carbon removal amount is calculated based on the second passive regeneration carbon removal rate and the correction factor, wherein the second passive regeneration carbon removal rate is calculated based on the second post-DOC NO2 proportion value.

[0024] In a possible implementation manner, the processor is specifically configured to: Calculate the ratio of the first post-DOC NO2 percentage value to the second post-DOC NO2 percentage value; The calculated ratio is used as the correction factor.

[0025] In a possible implementation manner, the processor is specifically configured to: The product of the second passive regeneration carbon removal rate and the correction factor is used as the first passive regeneration carbon removal rate; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0026] In a possible implementation manner, the processor is specifically configured to: Calculating a first difference between the carbon deposit amount and the first passive regeneration carbon removal amount; The first difference and the second difference between the active regeneration carbon removal amount are used as the first DPF model carbon load increase value.

[0027] In a possible implementation manner, the processor is further configured to: When it is determined that the remote post-injection is not turned on, in a second preset correspondence, a second post-DOC NO2 ratio value corresponding to the current DOC temperature and the current DOC airspeed is determined; Calculating the second passive regeneration carbon removal amount based on the second post-DOC NO2 percentage value; Calculating a second DPF model carbon load increase value based on the carbon deposit amount, the second passive regeneration carbon removal amount, and the active regeneration carbon removal amount; The sum of the current DPF model carbon load and the second DPF model carbon load increase value is used as the target DPF model carbon load.

[0028] In a possible implementation manner, the processor is specifically configured to: Calculating the second passive regeneration carbon removal rate based on the second post-DOC NO2 percentage value; The product of the second passive regeneration carbon removal rate and the preset time length is used as the second passive regeneration carbon removal amount.

[0029] The beneficial effects of the present invention are as follows: The present application provides a method, device and electronic device for determining the carbon load of a DPF model, the method comprising: in the case of determining to open the remote post-injection, firstly determining the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed in the first preset corresponding relationship, then calculating the first passive regeneration carbon removal amount based on the first post-DOC NO2 ratio, calculating the first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount and the active regeneration carbon removal amount, and finally taking the sum of the current DPF model carbon load and the first DPF model carbon load increase value as the target DPF model carbon load. Since the first passive regeneration carbon removal amount is calculated based on the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed, compared with using the theoretical NO2 ratio to calculate the passive regeneration carbon removal amount, the accuracy of the DPF model carbon load can be improved and the probability of the DPF being blocked or burned can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 A schematic diagram of the structure of a diesel engine aftertreatment system provided in an embodiment of the present application; Figure 2 A schematic flow chart of a method for determining the carbon loading of a DPF model provided in an embodiment of the present application; Figure 3 A schematic flow chart of another method for determining the carbon loading of a DPF model provided in an embodiment of the present application; Figure 4 A schematic flow chart of another method for determining the carbon loading of a DPF model provided in an embodiment of the present application; Figure 5 A schematic diagram of the structure of a device for determining the carbon loading of a DPF model provided in an embodiment of the present application; Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] For the convenience of description, some nouns or terms involved in the embodiments of the present application are explained below: DOC: Oxidation catalytic converter, installed in front of DPF, is used to oxidize NO (nitrogen monoxide) in exhaust gas into NO2 (nitrogen dioxide), while increasing the exhaust gas temperature and assisting the normal operation of DPF and SCR.

[0034] DPF: Particulate matter trap, used to capture particulate matter in exhaust gas. When the amount of captured particulate matter reaches a certain level, passive regeneration or active regeneration is required to restore the DPF's ability to capture particulate matter.

[0035] Pre-DOC temperature sensor: It is arranged in the exhaust pipe before the DOC to measure the exhaust temperature before the DOC.

[0036] DPF pre-temperature sensor: It is arranged in the exhaust pipe before the DPF to measure the exhaust temperature before the DPF. This temperature is used to estimate the carbon deposit amount of the DPF model and the HC (hydrocarbon) injection amount during regeneration.

[0037] DPF regeneration: Utilize the principle of NO2 produced in DOC and C (carbon) reaction to eliminate C in DPF.

[0038] DOC Space Speed: The speed of exhaust gas flowing through the DOC.

[0039] like Figure 1 FIG. 1 is a schematic diagram of a diesel engine aftertreatment system provided by an embodiment of the present application. Figure 1 It can be seen that the post-treatment system includes a DOC pre-temperature sensor T1, a DOC, a DPF pre-temperature sensor T2, a DPF, a SCR pre-temperature sensor T3, a SCR, an ASR and a SCR post-temperature sensor T4.

[0040] Exhaust gas from Figure 1 The diesel engine after-treatment system shown flows from the right side to the left side, and the exhaust gas passes through the DOC, DPF, SCR and ASR in sequence. The pre-DOC temperature sensor T1 is set on the exhaust pipe before the DOC, and the pre-DPF temperature sensor T2 is set on the exhaust pipe before the DPF.

[0041] A method for determining the carbon loading of a DPF model provided in an embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0042] like Figure 2 As shown, a method for determining the carbon load of a DPF model provided in an embodiment of the present application specifically includes the following steps: S201, when it is determined to start the remote post-injection, in a first preset correspondence, determining a first post-DOC NO2 ratio value corresponding to the current DOC temperature and the current DOC airspeed; S202, calculating a first passive regeneration carbon removal amount based on the first post-DOC NO2 percentage value; S203, calculating a first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount, and the active regeneration carbon removal amount; S204: taking the sum of the current DPF model carbon load and the first DPF model carbon load increase value as the target DPF model carbon load.

[0043] In the embodiment of the present application, when it is determined to turn on the remote post-injection, firstly, in the first preset corresponding relationship, the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined, and then based on the first post-DOC NO2 ratio, the first passive regeneration carbon removal amount is calculated, and based on the carbon deposit amount, the first passive regeneration carbon removal amount and the active regeneration carbon removal amount, the first DPF model carbon load increase value is calculated, and finally the sum of the current DPF model carbon load and the first DPF model carbon load increase value is used as the target DPF model carbon load. Since the first passive regeneration carbon removal amount is calculated based on the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed, compared with using the theoretical NO2 ratio to calculate the passive regeneration carbon removal amount, the accuracy of the DPF model carbon load can be improved, and the probability of the DPF being blocked or burned can be reduced.

[0044] The first preset correspondence in the embodiment of the present application is the correspondence between the DOC temperature, the DOC airspeed and the NO2 proportion after the first DOC. The first preset correspondence can be generated based on a large amount of experimental data. The first preset correspondence can be displayed in the form of a chart, as shown in Table 1 below.

[0045]

[0046] Table 1 When it is determined that the remote post-injection is turned on, the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined from Table 1. For example, if the current DOC temperature is a1 and the current DOC airspeed is b1, then by looking up Table 1, the first post-DOC NO2 ratio is c1.

[0047] In the embodiment of the present application, the current DOC temperature can be Figure 1 The temperature before the DOC is collected by the DOC temperature sensor T1, and the current DOC airspeed, that is, the speed of the exhaust gas flowing through the DOC, can be calculated by the ECU (Electronic Control Unit).

[0048] In one embodiment, whether the remote post injection is turned on can be determined by the injection amount q of the remote post injection. When the injection amount q of the remote post injection is greater than 0, it is determined that the remote post injection is turned on. When the injection amount q of the remote post injection is 0, it is determined that the remote post injection is not turned on.

[0049] When it is determined that the remote post-injection is turned on and the first post-DOC NO2 proportion is determined, the first passive regeneration carbon removal amount is calculated based on the first post-DOC NO2 proportion. Specifically, the first passive regeneration carbon removal rate is calculated based on the first post-DOC NO2 proportion, and then the product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0050] In one embodiment, the first passive regeneration carbon removal rate = NOx mass flow rate × first post-DOC NO2 ratio × (carbon removal correction factor based on carbon load) × (correction factor based on DPF exhaust temperature and DPF space velocity) × (fixed carbon / NO2 coefficient).

[0051] The NOx mass flow rate can be measured by a nitrogen oxide sensor and calculated by an ECU, or can be obtained by looking up a table. If obtained by looking up a table, the table includes the corresponding relationship between the speed, the circulating fuel supply, and the NOx mass flow rate. According to the current speed and the circulating fuel supply, the NOx mass flow rate corresponding to the current speed and the circulating fuel supply is searched from the table. The current speed and the circulating fuel supply can be obtained by the sensor on the engine and the ECU. The carbon removal correction coefficient based on the carbon load can be obtained by looking up a table. Specifically, the table includes the carbon load and the carbon removal correction coefficient based on the carbon load. According to the current carbon load, the carbon removal correction coefficient based on the carbon load corresponding to the current carbon load is found from the table. The current carbon load is the current carbon load of the DPF. The correction coefficient based on the DPF exhaust temperature and the DPF airspeed can be obtained by looking up a table. Specifically, the table includes the correspondence between the DPF exhaust temperature, the DPF airspeed and the correction coefficient. According to the current DPF exhaust temperature and the current DPF airspeed, the correction coefficient corresponding to the current DPF exhaust temperature and the current DPF airspeed is looked up from the table. The correction coefficient found is the correction coefficient based on the DPF exhaust temperature and the DPF airspeed. The fixed carbon / NO2 coefficient is a preset value, which is the ratio of the unit weight to the NO2 weight, where the NO2 weight is the weight of NO2 used for the complete reaction of the unit weight of carbon and NO2.

[0052] It should be noted that the DPF exhaust temperature is Figure 1 The temperature collected by the DPF front temperature sensor T2 and the DPF airspeed, that is, the speed of the exhaust gas flowing through the DPF, can be calculated by the ECU.

[0053] It should be noted that the preset time length in the embodiment of the present application may be the interval time length for determining the carbon load of the DPF model. For example, if the carbon load of the DPF model is determined once every 1 second, the preset time length is 1 second.

[0054] In one embodiment, based on the amount of carbon deposits, the first passive regeneration carbon removal amount and the active regeneration carbon removal amount, the first DPF model carbon load increase value is calculated. Specifically, the first difference between the amount of carbon deposits and the first passive regeneration carbon removal amount is calculated; the first difference and the second difference between the active regeneration carbon removal amount are used as the first DPF model carbon load increase value.

[0055] The amount of carbon deposits is obtained based on the carbon deposition rate and the preset time. Specifically, the product of the carbon deposition rate and the preset time is taken as the amount of carbon deposits.

[0056] In a specific implementation, the carbon deposition rate is calculated by: Carbon deposition rate = (model value of original carbon emission based on working conditions) × (coefficient based on change of excess air coefficient); The model value of the original carbon emission based on the working condition can be obtained by looking up a table, which includes the correspondence between the working condition and the model value of the original carbon emission based on the working condition. According to the current working condition, the model value of the original carbon emission based on the working condition corresponding to the current working condition is looked up from the table; The coefficient based on the change of the excess air coefficient is obtained through calculation, and the difference between the actual excess air coefficient and the theoretical excess air coefficient is used as the coefficient of the change of the excess air coefficient. The actual excess air coefficient can be calculated by the ECU, and the ECU can calculate the actual excess air coefficient through the intake volume. The theoretical excess air coefficient is a preset value.

[0057] The active regeneration carbon removal amount is obtained based on the active regeneration carbon removal rate and the preset time. Specifically, the product of the active regeneration carbon removal rate and the preset time is used as the active regeneration carbon removal amount.

[0058] In a specific implementation, the active regeneration carbon removal rate is calculated by the following method: Active regeneration carbon removal rate = (correction coefficient based on DPF exhaust temperature and DPF air speed) × (active regeneration carbon removal rate model value based on carbon load) × (correction coefficient based on excess air coefficient).

[0059] Among them, the correction coefficient based on the DPF exhaust temperature and the DPF airspeed can be obtained by looking up a table. Specifically, the table includes the correspondence between the DPF exhaust temperature, the DPF airspeed and the correction coefficient. According to the current DPF exhaust temperature and the current DPF airspeed, the correction coefficient corresponding to the current DPF exhaust temperature and the current DPF airspeed is found from the table. The correction coefficient found is the correction coefficient based on the DPF exhaust temperature and the DPF airspeed. The active regeneration carbon removal rate model value based on the carbon load can be obtained by looking up a table. Specifically, the table includes the corresponding relationship between the current DPF carbon deposit amount and the active regeneration carbon removal rate model value. According to the current DPF carbon deposit amount, the active regeneration carbon removal rate model value corresponding to the current DPF carbon deposit amount is found from the table, and the found active regeneration carbon removal rate model value is used as the active regeneration carbon removal rate model value based on the carbon load; The correction coefficient based on the excess air coefficient can be obtained by looking up a table. Specifically, the table includes the correspondence between the excess air coefficient and the correction coefficient. According to the current excess air coefficient, the correction coefficient corresponding to the current excess air coefficient is looked up from the table, and the correction coefficient found is used as the correction coefficient based on the excess air coefficient. The current excess air coefficient can be calculated by the ECU based on the intake volume.

[0060] After the first DPF model carbon load increase value is calculated, the sum of the current DPF model carbon load and the first DPF model carbon load increase value is used as the target DPF model carbon load.

[0061] In the above embodiment, when it is determined that the rear remote injection is turned on, since the first passive regeneration carbon removal amount is calculated based on the first post-DOC NO2 proportion value corresponding to the current DOC temperature and the current DOC airspeed, compared with using the theoretical NO2 proportion value to calculate the passive regeneration carbon removal amount, the accuracy of the DPF model carbon load can be improved and the probability of the DPF being blocked or burned can be reduced.

[0062] In another embodiment, when it is determined that the remote post-injection is not turned on, in a second preset corresponding relationship, a second post-DOC NO2 proportion value corresponding to the current DOC temperature and the current DOC airspeed is determined; based on the second post-DOC NO2 proportion value, the second passive regeneration carbon removal amount is calculated; based on the carbon deposit amount, the second passive regeneration carbon removal amount and the active regeneration carbon removal amount, the second DPF model carbon load increase value is calculated; and the sum of the current DPF model carbon load and the second DPF model carbon load increase value is used as the target DPF model carbon load.

[0063] The second preset corresponding relationship in the embodiment of the present application is the corresponding relationship between the DOC temperature, the DOC airspeed and the NO2 proportion after the second DOC. The second preset corresponding relationship can be generated based on a large amount of experimental data. The second preset corresponding relationship can be displayed in the form of a chart, as shown in Table 2 below.

[0064]

[0065] Table 2 When it is determined that the far post-injection is not turned on, the NO2 proportion value after the second DOC corresponding to the current DOC temperature and the current DOC airspeed is determined from Table 2. For example, the current DOC temperature is a1, and the current DOC airspeed is b1. By looking up Table 2, the NO2 proportion value after the second DOC is c4.

[0066] In a specific implementation, whether the remote post injection is turned on is determined by the injection amount q of the remote post injection, and if the injection amount q of the remote post injection is determined to be 0, it is determined that the remote post injection is not turned on.

[0067] When it is determined that the remote post-injection is not turned on and the second post-DOC NO2 proportion is determined, the second passive regeneration carbon removal amount is calculated based on the second post-DOC NO2 proportion. Specifically, the second passive regeneration carbon removal rate is calculated based on the second post-DOC NO2 proportion, and then the product of the second passive carbon removal rate and the preset time length is used as the second passive regeneration carbon removal amount.

[0068] In one embodiment, the second passive regeneration carbon removal rate = NOx mass flow rate × second post-DOC NO2 ratio × (carbon removal correction factor based on carbon load) × (correction factor based on DPF exhaust temperature and DPF space velocity) × (fixed carbon / NO2 coefficient).

[0069] Among them, the specific meanings of NOx mass flow rate, carbon removal correction coefficient based on carbon load, correction coefficient based on DPF exhaust temperature and DPF air velocity, and fixed carbon / NO2 coefficient can be calculated by referring to the NOx mass flow rate, carbon removal correction coefficient based on carbon load, correction coefficient based on DPF exhaust temperature and DPF air velocity, and fixed carbon / NO2 coefficient in the first passive regeneration carbon removal rate in the above embodiment, and will not be repeated here.

[0070] After the second passive regeneration carbon elimination amount is calculated, the second DPF model carbon load increase value is calculated based on the carbon deposit amount, the second passive regeneration carbon elimination amount and the active regeneration carbon elimination amount. Specifically, the third difference between the carbon deposit amount and the second passive regeneration carbon elimination amount is calculated; the third difference and the fourth difference between the active regeneration carbon elimination amount are used as the second DPF model carbon load increase value, and the sum of the current DPF model carbon load and the second DPF model carbon load increase value is used as the target DPF model carbon load.

[0071] In the embodiment of the present application, the calculation of the carbon deposit amount and the active regeneration carbon removal amount can refer to the calculation of the carbon load and the active regeneration carbon removal amount when calculating the carbon load increase value of the first DPF model in the above embodiment, and will not be repeated here.

[0072] In the above embodiment, when it is determined that the far post injection is not turned on, since the second passive regeneration carbon removal amount is calculated based on the second post-DOC NO2 proportion value corresponding to the current DOC temperature and the current DOC airspeed, compared with using the theoretical NO2 proportion value to calculate the passive regeneration carbon removal amount, the accuracy of the DPF model carbon load can be improved and the probability of the DPF being blocked or burned can be reduced.

[0073] like Figure 3 , which is a flow chart of a method for determining the carbon loading of a DPF model provided in an embodiment of the present application, specifically comprising the following steps: S301, obtaining the injection amount q of the far-rear injection, the current DOC temperature, and the current DOC airspeed; S302, determining that the injection amount q of the far rear injection is greater than 0; S303, confirm to start the remote spray; S304, determining a first post-DOC NO2 ratio value corresponding to the current DOC temperature and the current DOC airspeed in the first preset corresponding relationship; S305, calculating the first passive regeneration carbon removal rate based on the first post-DOC NO2 ratio; S306, calculating a first passive regeneration carbon removal amount based on the first passive regeneration carbon removal rate; S307, calculating a first difference between the carbon deposit amount and the first passive regeneration carbon removal amount, calculating a second difference between the first difference and the active regeneration carbon removal amount, and using the second difference as the first DPF model carbon load increase value; S308, taking the sum of the current DPF model carbon load and the first DPF model carbon load increase value as the target DPF model carbon load; S309, determining that the injection amount q of the far rear injection is equal to 0; S310, determining that the remote rear spray is not turned on; S311, determining a second post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed in the second preset corresponding relationship; S312, calculating the second passive regeneration carbon removal rate based on the second post-DOC NO2 ratio; S313, calculating a second passive regeneration carbon removal amount based on a second passive regeneration carbon removal rate; S314, calculating a third difference between the carbon deposit amount and the second passive regeneration carbon removal amount, calculating a fourth difference between the third difference and the active regeneration carbon removal amount, and using the fourth difference as the second DPF model carbon load increase value; S315 : Taking the sum of the current DPF model carbon load and the second DPF model carbon load increase value as the target DPF model carbon load.

[0074] In one embodiment, when it is determined that the remote post-injection is turned on, after the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined, in the second corresponding relationship, the second post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined, and the correction factor is calculated based on the second post-DOC NO2 ratio and the first post-DOC NO2 ratio, and the second passive regeneration carbon removal rate is calculated based on the second post-DOC NO2 ratio, and finally the first passive regeneration carbon removal amount is calculated based on the second passive regeneration carbon removal rate and the correction factor. After the first passive regeneration carbon removal amount is calculated, the first DPF model carbon load increase value is calculated based on the carbon deposit amount, the calculated first passive regeneration carbon removal amount and the active regeneration carbon removal amount, and finally, the sum of the current DPF model carbon load and the calculated first DPF model carbon load increase value is used as the target DPF model carbon load.

[0075] Specifically, the ratio of the first post-DOC NO2 percentage value to the second post-DOC NO2 percentage value is used as the correction factor.

[0076] For example, if the NO2 percentage after the first DOC is B and the NO2 percentage after the second DOC is A, then the correction factor μ=B / A.

[0077] After the correction factor is calculated, the first passive regeneration carbon removal rate is calculated based on the second passive regeneration carbon removal rate and the correction factor, and the product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0078] Specifically, based on the second passive regeneration carbon removal rate and the correction factor, the first passive regeneration carbon removal rate is calculated, and the product of the second passive regeneration carbon removal rate and the correction factor is used as the first passive regeneration carbon removal rate.

[0079] The first passive regeneration carbon removal rate = the second passive regeneration carbon removal rate × μ.

[0080] The second passive regeneration carbon removal rate = NOx mass flow rate × NO2 proportion after the second DOC × (carbon removal correction factor based on carbon load) × (correction factor based on DPF exhaust temperature and DPF air speed) × (fixed carbon / NO2 coefficient).

[0081] Among them, μ is the correction factor; The specific meanings of NOx mass flow rate, carbon removal correction coefficient based on carbon load, correction coefficient based on DPF exhaust temperature and DPF air velocity, and fixed carbon / NO2 coefficient can be calculated by referring to the above-mentioned embodiments for the calculation of the first passive regeneration carbon removal rate. The specific meanings of NOx mass flow rate, carbon removal correction coefficient based on carbon load, correction coefficient based on DPF exhaust temperature and DPF air velocity, and fixed carbon / NO2 coefficient will not be repeated here.

[0082] It should be noted that when the far rear spray is not turned on, the correction factor is equal to 1.

[0083] like Figure 4 FIG. 1 is a flow chart of another method for determining the carbon load of a DPF model provided in an embodiment of the present application, which specifically includes the following steps: S401, obtaining the injection amount q of the far-rear injection, the current DOC temperature, and the current DOC airspeed; S402, determining that the injection amount q of the far rear injection is greater than 0; S403, confirm to start the remote spray; S404, determining a first post-DOC NO2 ratio value corresponding to the current DOC temperature and the current DOC airspeed in the first preset corresponding relationship, and determining a second post-DOC NO2 ratio value corresponding to the current DOC temperature and the current DOC airspeed in the second preset corresponding relationship; S405, using the ratio of the first post-DOC NO2 percentage value to the second post-DOC NO2 percentage value as a correction factor, and calculating the second passive regeneration carbon removal rate based on the second post-DOC NO2 percentage value; S406, calculating the first passive regeneration carbon removal rate based on the second passive regeneration carbon removal rate and the correction factor; S407, taking the product of the first passive regeneration carbon removal rate and the preset time as the first passive regeneration carbon removal amount; S408, calculating a first difference between the carbon deposit amount and the first passive regeneration carbon removal amount, calculating a second difference between the first difference and the active regeneration carbon removal amount, and using the second difference as the first DPF model carbon load increase value; S409 , taking the sum of the current DPF model carbon load and the first DPF model carbon load increase value as the target DPF model carbon load.

[0084] In an embodiment of the present application, a correction factor is used to correct the second passive regeneration carbon removal rate based on the ratio of the first post-DOC NO2 percentage value to the second post-DOC NO2 percentage value, thereby obtaining the first passive regeneration carbon removal rate, thereby improving the accuracy of the carbon loading of the DPF model and reducing the probability of the DPF being blocked or burned.

[0085] Based on the same inventive concept, an embodiment of the present application also provides a device for determining the carbon load of a DPF model. The principle of solving the technical problem by the device for determining the carbon load of a DPF model is similar to the principle of solving the technical problem by the method for determining the carbon load of a DPF model mentioned above. The implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0086] like Figure 5FIG. 1 is a schematic diagram of a structure of a device for determining carbon loading of a DPF model provided by the present application, the device comprising: The determination module 501 is used to determine, in the case of determining to start the remote post-injection, a first post-DOC NO2 ratio value corresponding to the current DOC temperature and the current DOC airspeed in a first preset correspondence relationship; The calculation module 502 is used to calculate the first passive regeneration carbon removal amount based on the first post-DOC NO2 proportion value; calculate the first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount and the active regeneration carbon removal amount; and use the sum of the current DPF model carbon load and the first DPF model carbon load increase value as the target DPF model carbon load.

[0087] In one embodiment, the calculation module 502 is specifically used for: Calculating a first passive regeneration carbon removal rate based on the first post-DOC NO2 percentage value; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0088] In one embodiment, the calculation module 502 is specifically used for: In the second preset corresponding relationship, determining a second post-DOC NO2 percentage value corresponding to the current DOC temperature and the current DOC airspeed; Calculating a correction factor based on the second post-DOC NO2 percentage value and the first post-DOC NO2 percentage value; The first passive regeneration carbon removal amount is calculated based on the second passive regeneration carbon removal rate and the correction factor, wherein the second passive regeneration carbon removal rate is calculated based on the second post-DOC NO2 proportion value.

[0089] In one embodiment, the calculation module 502 is specifically used for: Calculate the ratio of the first post-DOC NO2 percentage value to the second post-DOC NO2 percentage value; The calculated ratio is used as the correction factor.

[0090] In one embodiment, the calculation module 502 is specifically used for: The product of the second passive regeneration carbon removal rate and the correction factor is used as the first passive regeneration carbon removal rate; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0091] In one embodiment, the calculation module 502 is specifically used for: Calculating a first difference between the carbon deposit amount and the first passive regeneration carbon removal amount; The first difference and the second difference between the active regeneration carbon removal amount are used as the first DPF model carbon load increase value.

[0092] In one embodiment, the determination module 501 is further configured to: When it is determined that the remote post-injection is not turned on, in the second preset correspondence, a second post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined; The calculation module 502 is also used for: Calculating the second passive regeneration carbon removal amount based on the second post-DOC NO2 percentage value; Calculating a second DPF model carbon load increase value based on the carbon deposit amount, the second passive regeneration carbon removal amount, and the active regeneration carbon removal amount; The sum of the current DPF model carbon load and the second DPF model carbon load increase value is used as the target DPF model carbon load.

[0093] In one embodiment, the calculation module 502 is specifically used for: Calculating the second passive regeneration carbon removal rate based on the second post-DOC NO2 percentage value; The product of the second passive regeneration carbon removal rate and the preset time length is used as the second passive regeneration carbon removal amount.

[0094] Based on the same inventive concept, an embodiment of the present application also provides an electronic device. The principle of the electronic device in solving the technical problem is similar to the principle of the method for determining the carbon load of the DPF model mentioned above in solving the technical problem. The implementation of the electronic device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0095] like Figure 6 FIG. 1 is a schematic diagram of a structure of an electronic device provided by the present application, and the electronic device includes: Memory 601, used for storing computer programs; The processor 602 is configured to implement the following steps when executing the computer program stored in the memory: When it is determined to start the remote post-injection, in the first preset correspondence, the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined; Calculating the first passive regeneration carbon removal amount based on the first post-DOC NO2 percentage value; Calculating a first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount, and the active regeneration carbon removal amount; The sum of the current DPF model carbon load and the first DPF model carbon load increase value is used as the target DPF model carbon load.

[0096] In one embodiment, the processor 602 is specifically configured to: Calculating a first passive regeneration carbon removal rate based on the first post-DOC NO2 percentage value; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0097] In one embodiment, the processor 602 is specifically configured to: In the second preset corresponding relationship, determining a second post-DOC NO2 percentage value corresponding to the current DOC temperature and the current DOC airspeed; Calculating a correction factor based on the second post-DOC NO2 percentage value and the first post-DOC NO2 percentage value; The first passive regeneration carbon removal amount is calculated based on the second passive regeneration carbon removal rate and the correction factor, wherein the second passive regeneration carbon removal rate is calculated based on the second post-DOC NO2 proportion value.

[0098] In one embodiment, the processor 602 is specifically configured to: Calculate the ratio of the first post-DOC NO2 percentage value to the second post-DOC NO2 percentage value; The calculated ratio is used as the correction factor.

[0099] In one embodiment, the processor 602 is specifically configured to: The product of the second passive regeneration carbon removal rate and the correction factor is used as the first passive regeneration carbon removal rate; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

[0100] In one embodiment, the processor 602 is specifically configured to: Calculating a first difference between the carbon deposit amount and the first passive regeneration carbon removal amount; The first difference and the second difference between the active regeneration carbon removal amount are used as the first DPF model carbon load increase value.

[0101] In one embodiment, the processor 602 is further configured to: When it is determined that the remote post-injection is not turned on, in the second preset correspondence, a second post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined; Calculating the second passive regeneration carbon removal amount based on the second post-DOC NO2 percentage value; Calculating a second DPF model carbon load increase value based on the carbon deposit amount, the second passive regeneration carbon removal amount, and the active regeneration carbon removal amount; The sum of the current DPF model carbon load and the second DPF model carbon load increase value is used as the target DPF model carbon load.

[0102] In one embodiment, the processor 602 is specifically configured to: Calculating the second passive regeneration carbon removal rate based on the second post-DOC NO2 percentage value; The product of the second passive regeneration carbon removal rate and the preset time length is used as the second passive regeneration carbon removal amount.

[0103] The present application provides a method, device and electronic device for determining the carbon load of a DPF model. When it is determined that the remote post-injection is turned on, first, in the first preset corresponding relationship, the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined, and then based on the first post-DOC NO2 ratio, the first passive regeneration carbon removal amount is calculated, and based on the carbon deposit amount, the first passive regeneration carbon removal amount and the active regeneration carbon removal amount, the first DPF model carbon load increase value is calculated, and finally the sum of the current DPF model carbon load and the first DPF model carbon load increase value is used as the target DPF model carbon load. Since the first passive regeneration carbon removal amount is calculated based on the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed, compared with using the theoretical NO2 ratio to calculate the passive regeneration carbon removal amount, the accuracy of the DPF model carbon load can be improved, and the probability of the DPF being blocked or burned can be reduced.

[0104] The present application is described above with reference to the block diagrams and / or flow charts showing the methods, devices (systems) and / or computer program products according to the embodiments of the present application. It should be understood that a block of the block diagram and / or flow chart diagram and a combination of blocks of the block diagram and / or flow chart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer and / or other programmable data processing device to produce a machine, so that the instructions executed by the computer processor and / or other programmable data processing device create a method for implementing the functions / actions specified in the block diagram and / or flow chart block.

[0105] Accordingly, the present application may also be implemented in hardware and / or software (including firmware, resident software, microcode, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium, which has a computer-usable or computer-readable program code implemented in the medium for use by an instruction execution system or in conjunction with an instruction execution system. In the context of the present application, a computer-usable or computer-readable medium may be any medium that may contain, store, communicate, transmit, or convey a program for use by an instruction execution system, device, or apparatus, or in conjunction with an instruction execution system, device, or apparatus.

[0106] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for determining the carbon loading of a DPF model, characterized in that: The method comprises: When it is determined to start the remote post-injection, in the first preset correspondence, the first post-DOC NO2 ratio corresponding to the current DOC temperature and the current DOC airspeed is determined; Calculating the first passive regeneration carbon removal amount based on the first post-DOC NO2 percentage value; Calculating a first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount, and the active regeneration carbon removal amount; The sum of the current DPF model carbon load and the first DPF model carbon load increase value is used as the target DPF model carbon load.

2. The method according to claim 1, characterized in that The calculating of the first passive regeneration carbon removal amount based on the first post-DOC NO2 ratio value includes: Calculating a first passive regeneration carbon removal rate based on the first post-DOC NO2 percentage value; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

3. The method according to claim 1, characterized in that The calculating of the first passive regeneration carbon removal amount based on the first post-DOC NO2 ratio value includes: In the second preset corresponding relationship, determining a second post-DOC NO2 percentage value corresponding to the current DOC temperature and the current DOC airspeed; Calculating a correction factor based on the second post-DOC NO2 percentage value and the first post-DOC NO2 percentage value; The first passive regeneration carbon removal amount is calculated based on the second passive regeneration carbon removal rate and the correction factor, wherein the second passive regeneration carbon removal rate is calculated based on the second post-DOC NO2 proportion value.

4. The method according to claim 3, characterized in that The calculating of the correction factor based on the second post-DOC NO2 proportion value and the first post-DOC NO2 proportion value comprises: Calculate the ratio of the first post-DOC NO2 percentage value to the second post-DOC NO2 percentage value; The calculated ratio is used as the correction factor.

5. The method according to claim 3, characterized in that The calculating the first passive regeneration carbon removal amount based on the second passive regeneration carbon removal rate and the correction factor comprises: The product of the second passive regeneration carbon removal rate and the correction factor is used as the first passive regeneration carbon removal rate; The product of the first passive regeneration carbon removal rate and the preset time length is used as the first passive regeneration carbon removal amount.

6. The method according to claim 1, characterized in that The calculating the first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount and the active regeneration carbon removal amount includes: Calculating a first difference between the carbon deposit amount and the first passive regeneration carbon removal amount; The first difference and the second difference between the active regeneration carbon removal amount are used as the first DPF model carbon load increase value.

7. The method according to claim 1, characterized in that The method further comprises: When it is determined that the remote post-injection is not turned on, in a second preset correspondence, a second post-DOC NO2 ratio value corresponding to the current DOC temperature and the current DOC airspeed is determined; Calculating the second passive regeneration carbon removal amount based on the second post-DOC NO2 percentage value; Calculating a second DPF model carbon load increase value based on the carbon deposit amount, the second passive regeneration carbon removal amount, and the active regeneration carbon removal amount; The sum of the current DPF model carbon load and the second DPF model carbon load increase value is used as the target DPF model carbon load.

8. The method according to claim 7, characterized in that The calculating of the second passive regeneration carbon removal amount based on the second post-DOC NO2 ratio value includes: Calculating the second passive regeneration carbon removal rate based on the second post-DOC NO2 percentage value; The product of the second passive regeneration carbon removal rate and the preset time length is used as the second passive regeneration carbon removal amount.

9. A device for determining the carbon loading of a DPF model, characterized in that: include: A determination module, for determining, in a first preset correspondence relationship, a first post-DOC NO2 ratio value corresponding to a current DOC temperature and a current DOC airspeed when it is determined that the remote post-injection is turned on; A calculation module is used to calculate the first passive regeneration carbon removal amount based on the first post-DOC NO2 proportion value; calculate the first DPF model carbon load increase value based on the carbon deposit amount, the first passive regeneration carbon removal amount and the active regeneration carbon removal amount; and use the sum of the current DPF model carbon load and the first DPF model carbon load increase value as the target DPF model carbon load.

10. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor, configured to implement the method steps of any one of claims 1 to 8 when executing a computer program stored in the memory.

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