CN114738083B

CN114738083B - Control method, control device and control system for carbon loading of particulate matter catcher

Info

Publication number: CN114738083B
Application number: CN202210504357.8A
Authority: CN
Inventors: 张军; 张竞菲; 杨金鹏; 牟大伟
Original assignee: Weichai Power Co Ltd; Weifang Weichai Power Technology Co Ltd
Current assignee: Weichai Power Co Ltd; Weifang Weichai Power Technology Co Ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2023-08-18
Anticipated expiration: 2042-05-10
Also published as: CN114738083A

Abstract

The application provides a control method, a control device and a control system for carbon loading capacity of a particulate matter catcher, wherein the method comprises the following steps: acquiring the carbon loading of the particulate matter catcher; under the condition that the carbon loading is larger than a first preset value, a first carbon removing mode is entered to remove carbon or a second carbon removing mode is entered to remove carbon, wherein the first carbon removing mode is a mode for reducing the injection quantity of a front urea nozzle, and the second carbon removing mode is a mode for controlling an injector to inject fuel into an oxidation catalytic converter and keeping the temperature at the inlet of a particulate matter catcher larger than a preset temperature value. The method solves the problem that the passive regeneration amount of the particulate matter catcher is reduced due to the catalytic reduction reaction of the front-end catalytic converter in the prior art.

Description

Control method, control device and control system for carbon loading of particulate matter catcher

Technical Field

The application relates to the technical field of engine exhaust treatment, in particular to a control method, a control device, a computer readable storage medium, a processor and a control system for carbon loading of a particulate matter trap.

Background

The double SCR system can further improve SCR conversion efficiency, is favorable for improving NOx level of an engine, reduces oil consumption, simultaneously reduces thermal management requirements, crystallization risks and the like, but the existence of the front SCR leads to reduction of NO2 quantity which can be obtained by the DPF, and further leads to reduction of passive regeneration quantity in the DPF.

The above information disclosed in the background section is only for enhancement of understanding of the background art from the technology described herein and, therefore, may contain some information that does not form the prior art that is already known in the country to a person of ordinary skill in the art.

Disclosure of Invention

The application mainly aims to provide a control method, a control device, a computer readable storage medium, a processor and a control system for the carbon load of a particulate matter trap, so as to solve the problem that the passive regeneration amount of the particulate matter trap is reduced due to the catalytic reduction reaction of a pre-catalytic converter in the prior art.

According to an aspect of an embodiment of the present application, there is provided a method for controlling a carbon load of a particulate trap, a dual SCR device including a pre-urea nozzle, a first exhaust pipe, a pre-catalytic converter, an oxidation-catalytic converter, a fuel injector, and a particulate trap, the first exhaust pipe including a first end, a second end, and a third end, the oxidation-catalytic converter including a fourth end, a fifth end, and a sixth end, the first end being connected to a cylinder of an engine, the second end being connected to one end of the pre-catalytic converter, the pre-urea nozzle being connected to the third end, the other end of the pre-catalytic converter being connected to the fourth end, the fifth end being connected to one end of the particulate trap, the fuel injector being connected to the sixth end, the method comprising: acquiring a carbon loading of the particulate matter trap; under the condition that the carbon loading is larger than a first preset value, a first carbon removing mode is entered to remove carbon or a second carbon removing mode is entered to remove carbon, wherein the first carbon removing mode is a mode of reducing the injection quantity of the front urea nozzle, and the second carbon removing mode is a mode of controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping the temperature at the inlet of the particulate matter catcher larger than a preset temperature value.

Optionally, the dual SCR device further includes a second exhaust pipe and a post-catalytic converter, the second exhaust pipe includes a seventh end and an eighth end, the other end of the particulate matter trap is connected with the seventh end, the eighth end is connected with one end of the post-catalytic converter, and the dual SCR device enters a first carbon removal mode to remove carbon or enters a second carbon removal mode to remove carbon, and includes: entering the first decarbonizing mode under the condition that the carbon loading is larger than a first preset value and smaller than or equal to a second preset value, wherein the first preset value is smaller than the second preset value; acquiring a first temperature value, a second temperature value and a third temperature value, wherein the first temperature value is the temperature of the inlet of the front-end catalytic converter, the second temperature value is the temperature of the inlet of the particulate matter trap, and the third temperature value is the temperature of the inlet of the rear-end catalytic converter; and under the condition that a first condition, a second condition, a third condition and a fourth condition are simultaneously met, the injection quantity of the pre-urea nozzle is reduced, the particulate matter trap is controlled to be passively regenerated, the first condition is that the first temperature value is in a first temperature range, the second condition is that the second temperature value is in a second temperature range, the third condition is that the third temperature value is in a third temperature range, the fourth condition is that the conversion efficiency is larger than a preset efficiency value, the conversion efficiency is a difference between 100% and a first ratio, and the first ratio is the ratio of the nitrogen oxide compound at the inlet of the pre-catalytic converter to the nitrogen oxide compound at the outlet of the post-catalytic converter.

Optionally, after entering the first carbon removal mode, the method further comprises: and if at least one of the first condition, the second condition, the third condition and the fourth condition is not satisfied, exiting the first carbon removal mode.

Optionally, the second carbon removal mode includes a first carbon removal mode and a second carbon removal mode, the first carbon removal mode is a mode of controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping a temperature at an inlet of the particulate matter trap greater than the preset temperature value and less than an active regeneration temperature threshold, the active regeneration temperature threshold is a maximum temperature value meeting a requirement that the passive regeneration of the particulate matter trap occurs, and is a minimum temperature value meeting a requirement that the active regeneration of the particulate matter trap occurs, the second carbon removal mode is a mode of controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping a temperature at the inlet of the particulate matter trap greater than the active regeneration temperature threshold, and under a condition that the carbon loading is greater than a first preset value, entering the first carbon removal mode to perform carbon removal or the second carbon removal mode to perform carbon removal, and further includes: entering the first carbon removal sub-mode when the carbon loading is greater than the second preset value and less than or equal to a third preset value, wherein the second preset value is less than the third preset value; and entering the second carbon removal sub-mode under the condition that the carbon loading is larger than the third preset value and smaller than or equal to a fourth preset value, wherein the third preset value is smaller than the fourth preset value.

Optionally, after entering the first carbon removal sub-mode, the method further comprises: a first control step of controlling the fuel injector to inject fuel into the oxidation catalyst; an acquisition step of acquiring passive regeneration time, wherein the passive regeneration time is the time when the second temperature value is larger than the preset temperature value; a first judging step of judging whether the passive regeneration time is equal to a preset time; an iteration step, wherein the acquisition step and the first judgment step are sequentially repeated at least once until the passive regeneration time is equal to a preset time; when the passive regeneration time is equal to the preset time, controlling the fuel injector to stop injecting fuel into the oxidation catalytic converter; a second judging step of judging whether the carbon load at the current time is smaller than a fifth preset value when the passive regeneration time is equal to the preset time; sequentially repeating the first control step, the iteration step and the second judgment step at least once until the carbon loading is smaller than the fifth preset value; and when the carbon loading is smaller than the fifth preset value, exiting the first carbon removal sub-mode.

Optionally, after entering the second carbon removal sub-mode, the method further comprises: controlling the fuel injector to inject fuel into the oxidation catalytic converter; acquiring the carbon loadings of a plurality of continuous time nodes; a third judging step of judging whether the target carbon loading is smaller than or equal to a sixth preset value, wherein the target carbon loading is the carbon loading of any one of the time nodes; repeating the third judging step at least once until the target carbon loading is less than or equal to the sixth preset value; and under the condition that the target carbon loading is smaller than or equal to the sixth preset value, exiting the second carbon removal sub-mode.

Optionally, the second exhaust pipe further includes a ninth end, the dual SCR device further includes a post urea nozzle, the post urea nozzle is connected with the ninth end, and after entering the second carbon removal sub-mode, the method further includes: increasing the injection amount of the pre-urea nozzle and decreasing or maintaining the injection amount of the post-urea nozzle.

Optionally, obtaining the carbon loading of the particulate trap comprises: calculating a first soot mass flow according to the rotating speed of the engine and the oil injection quantity of the engine, wherein the first soot mass flow is the mass flow of soot discharged by the engine; calculating a second soot mass flow rate from a first conversion efficiency, a second conversion efficiency and the first soot mass flow rate, the first conversion efficiency being a conversion efficiency of the pre-catalytic converter, the second conversion efficiency being a conversion efficiency of the oxidation catalytic converter, the second soot mass flow rate being a product of the soot mass flow rate discharged from the engine and a first preliminary conversion efficiency, the first preliminary conversion efficiency being a product of a second preliminary conversion efficiency and a third preliminary conversion efficiency, the second preliminary conversion efficiency being a difference between 100% and the first conversion efficiency, the third preliminary conversion efficiency being a difference between 100% and the second conversion efficiency; and calculating the integral of third carbon smoke mass flow rate and time to obtain the carbon load, wherein the third carbon smoke mass flow rate is the difference value between the second carbon smoke mass flow rate and fourth carbon smoke mass flow rate, and the fourth carbon smoke mass flow rate is the sum of the carbon smoke mass flow rate generated by passive regeneration of the particulate matter trap and the carbon smoke mass flow rate generated by active regeneration of the particulate matter trap.

Optionally, calculating the first soot mass flow according to the rotation speed of the engine and the fuel injection amount of the engine includes: inquiring a soot emission table according to the rotating speed of the engine and the fuel injection quantity of the engine to obtain steady-state soot mass flow and a reference air-fuel ratio; obtaining a first correction amount according to the reference air-fuel ratio and an actual air-fuel ratio lookup air-fuel ratio table, wherein the actual air-fuel ratio is the ratio of the airspeed of the engine to the fuel injection amount of the engine; and calculating the product of the steady-state soot mass flow and the first correction amount to obtain the first soot mass flow.

Optionally, calculating a second soot mass flow based on the first conversion efficiency, the second conversion efficiency, and the first soot mass flow comprises: inquiring a conversion efficiency table of the pre-catalytic converter according to the temperature of the pre-catalytic converter and the airspeed of the pre-catalytic converter to obtain the first conversion efficiency; inquiring a conversion efficiency table of the oxidation catalytic converter according to the temperature of the oxidation catalytic converter and the airspeed of the oxidation catalytic converter to obtain the second conversion efficiency; and calculating the mass flow of the soot at the inlet of the particulate matter trap to obtain the second mass flow of the soot.

Optionally, before calculating the integral of the third soot mass flow over time to obtain the carbon loading, the method further comprises: inquiring a passive regeneration conversion efficiency table of the particulate trap according to the nitrogen dioxide mass in the particulate trap, the average temperature of the particulate trap, the flow of the nitrogen oxide of the particulate trap and the second soot mass flow to obtain the soot mass flow generated by passive regeneration of the particulate trap, wherein the nitrogen dioxide mass in the particulate trap is the sum of a first mass and a second mass, the first mass is the difference value between the nitrogen dioxide mass in the exhaust gas discharged by the engine and the nitrogen dioxide mass consumed in the pre-catalytic converter, and the second mass is the sum of the nitrogen dioxide mass generated in the oxidation catalytic converter and the nitrogen dioxide mass supplemented in the particulate trap; and inquiring an active regeneration conversion efficiency table of the particulate matter trap according to the inlet oxygen concentration of the particulate matter trap, the average temperature of the particulate matter trap and the second soot mass flow, so as to obtain the soot mass flow generated by the active regeneration of the particulate matter trap.

According to another aspect of the embodiments of the present invention, there is provided a control device for controlling carbon loading of a particulate trap, the control device including a pre-urea nozzle, a first exhaust pipe, a pre-catalytic converter, an oxidation-catalytic converter, a fuel injector, and the particulate trap, the first exhaust pipe including a first end, a second end, and a third end, the oxidation-catalytic converter including a fourth end, a fifth end, and a sixth end, the first end being connected to a cylinder of an engine, the second end being connected to one end of the pre-catalytic converter, the pre-urea nozzle being connected to the third end, the other end of the pre-catalytic converter being connected to the fourth end, the fifth end being connected to one end of the particulate trap, the fuel injector being connected to the sixth end, the control device including: an acquisition unit that acquires a carbon loading of the particulate matter trap; and the control unit is used for entering a first carbon removal mode for carbon removal or a second carbon removal mode for carbon removal under the condition that the carbon loading is larger than a first preset value, wherein the first carbon removal mode is a mode for reducing the injection quantity of the front urea nozzle, and the second carbon removal mode is a mode for controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping the temperature at the inlet of the particulate matter catcher larger than a preset temperature value.

According to still another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein the program performs any one of the methods.

According to yet another aspect of the embodiments of the present invention, there is further provided a processor, where the processor is configured to execute a program, where the program executes any one of the methods.

According to an aspect of the embodiments of the present invention, there is also provided a control system for a particulate trap carbon loading, including: an engine, a dual SCR device, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods.

In the method for controlling the carbon loading of the particulate matter trap, firstly, the carbon loading of the particulate matter trap is obtained; and then, under the condition that the carbon loading is larger than a first preset value, entering a first carbon removal mode for carbon removal or a second carbon removal mode for carbon removal, wherein the first carbon removal mode is a mode for reducing the injection quantity of the front urea nozzle, and the second carbon removal mode is a mode for controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping the temperature at the inlet of the particulate matter catcher larger than a preset temperature value. When the carbon loading is larger than a first preset value, the method enters a first carbon removal mode or a second carbon removal mode to remove carbon from the particle catcher, the first carbon removal mode reduces the injection quantity of the front urea injection nozzle to weaken the catalytic reduction reaction of the front catalytic converter for converting nitrogen dioxide into nitrogen, improves the quantity of nitrogen dioxide at the inlet of the particle catcher to enable the particle catcher to perform passive regeneration, reduces the carbon loading of the particle catcher, controls the fuel injector to inject fuel into the oxidation catalytic converter, oxidizes the fuel by the oxidation catalytic converter, improves the temperature of the inlet of the particle catcher, enhances the oxidation reaction of nitric oxide into nitrogen dioxide in the temperature increasing process, further improves the quantity of nitrogen dioxide at the inlet of the particle catcher, enables the particle catcher to perform passive regeneration, rapidly reduces the carbon loading of the particle catcher, and reduces the carbon loading of the particle catcher by active regeneration at the temperature of the inlet of the particle catcher beyond the lowest temperature of the active regeneration of the particle catcher.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 illustrates a flow chart of a method of controlling a particulate trap carbon loading in accordance with an embodiment of the present application;

FIG. 2 illustrates a schematic diagram of a dual SCR device, according to a specific embodiment of the present application;

FIG. 3 illustrates a flow chart of a method of controlling particulate trap carbon loading in accordance with a specific embodiment of the present application;

FIG. 4 illustrates a first carbon removal sub-mode frequency control schematic in accordance with a particular embodiment of the present application;

FIG. 5 illustrates a schematic diagram of a particulate trap carbon loading control device according to one embodiment of the present application.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Furthermore, in the description and in the claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.

For convenience of description, the following will describe some terms or terminology involved in the embodiments of the present application:

presoc: the pre-SCR device is used for injecting urea before pre-SCR to reduce nitrogen oxides in exhaust emission, and the SCR is close to the turbine.

posSCR: a Selective Catalytic Reduction (SCR) device injects urea before SCR to reduce nitrogen oxides in exhaust emissions, the SCR is located far from the turbine.

DPF: a particulate matter trap (dieselparticlatefilter) for trapping the particulate matters in the exhaust gas, and when the trapped particulate matters reach a certain level, passive regeneration or active regeneration is required, so as to recover the trapping capability of the DPF on the particulate matters.

DOC: an oxidation catalytic converter (dieseloxide catalyst) is arranged before the DPF for converting NO in the exhaust gas to NO ₂ And meanwhile, the tail gas temperature is increased, and the normal operation of the DPF and the SCR is assisted.

As described in the background art, there is a problem in the prior art that the passive regeneration amount of the particulate matter trap is reduced due to the catalytic reduction reaction of the pre-catalytic converter, and in order to solve the above problem, in an exemplary embodiment of the present application, a method, a device, a computer readable storage medium, a processor and a control system for controlling the carbon loading of the particulate matter trap are provided.

According to an embodiment of the application, a method for controlling carbon loading of a particulate matter trap is provided.

FIG. 1 is a flow chart of a method of controlling a particulate matter trap carbon loading in accordance with an embodiment of the present application. As shown in fig. 1, the method comprises the steps of:

step S101, obtaining the carbon loading of the particulate matter catcher;

step S102, when the carbon loading is greater than a first preset value, entering a first carbon removal mode for removing carbon or a second carbon removal mode for removing carbon, where the first carbon removal mode is a mode for reducing the injection amount of the pre-urea nozzle, and the second carbon removal mode is a mode for controlling the injector to inject fuel into the oxidation catalytic converter and maintaining the temperature at the inlet of the particulate matter trap to be greater than a preset temperature value.

As shown in fig. 2, the pre-urea nozzle was DM1, the oxidation catalyst was DOC, the particulate matter trap was DPF, and the pre-catalyst was preSCR.

It should be noted that, when the particulate matter trap performs passive regeneration, nitrogen dioxide and carbon particles react chemically to generate nitric oxide and carbon dioxide, so as to achieve the purpose of removing carbon.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

In an embodiment of the present application, the dual SCR device further includes a second exhaust pipe and a post-catalytic converter, the second exhaust pipe includes a seventh end and an eighth end, the other end of the particulate matter trap is connected to the seventh end, the eighth end is connected to one end of the post-catalytic converter, and the dual SCR device enters the first carbon removal mode to remove carbon or enters the second carbon removal mode to remove carbon, and includes: entering the first decarbonizing mode under the condition that the carbon loading is larger than a first preset value and smaller than or equal to a second preset value, wherein the first preset value is smaller than the second preset value; acquiring a first temperature value, a second temperature value and a third temperature value, wherein the first temperature value is the temperature of the inlet of the front-end catalytic converter, the second temperature value is the temperature of the inlet of the particulate matter trap, and the third temperature value is the temperature of the inlet of the rear-end catalytic converter; in the case where the first condition, the second condition, the third condition and the fourth condition are satisfied simultaneously And (3) reducing the injection quantity of the pre-urea nozzle, controlling the particulate matter trap to perform passive regeneration, wherein the first condition is that the first temperature value is in a first temperature range, the second condition is that the second temperature value is in a second temperature range, the third condition is that the third temperature value is in a third temperature range, the fourth condition is that the conversion efficiency is larger than a preset efficiency value, the conversion efficiency is 100% of the difference value between the first ratio and the first ratio, and the first ratio is the ratio of the nitrogen oxide compound at the inlet of the pre-catalytic converter to the nitrogen oxide compound at the outlet of the post-catalytic converter. In this embodiment, as shown in FIG. 3, the carbon loading M in the particulate trap _soot Under the condition that the temperature in the particulate matter catcher meets the temperature requirement for proper passive regeneration, the injection quantity of the front urea nozzle is reduced, namely the conversion efficiency of the front catalytic converter is reduced, namely the catalytic reduction reaction of converting nitrogen dioxide in the front catalytic converter into nitrogen is weakened, the concentration of the nitrogen dioxide at the inlet of the particulate matter catcher is improved, the particulate matter catcher is further enabled to perform passive regeneration, carbon particles in the particulate matter catcher are removed through passive regeneration, the carbon loading of the particulate matter catcher is reduced, the injection quantity of the rear urea nozzle is increased while the injection quantity of the front urea nozzle is reduced, the conversion efficiency of the rear catalytic converter is improved, namely the high nitrogen compound in the engine exhaust is ensured.

It should be noted that, the temperature of the inlet of the front-end catalytic converter is in the first temperature range, so that the front-end catalytic converter is ensured to have higher conversion efficiency, the temperature of the inlet of the particulate matter catcher is in the second temperature range, the temperature of the particulate matter catcher is ensured to meet the temperature requirement of proper passive regeneration, the temperature of the inlet of the rear-end catalytic converter is in the third temperature range, the rear-end catalytic converter is ensured to have higher conversion efficiency, the fourth condition is that the conversion efficiency is greater than the preset efficiency value, and the capability of the dual-SCR system for reducing nitrogen-oxygen compounds in engine exhaust gas is ensured to meet the standard.

It should be noted that, as shown in fig. 2, the temperature of the inlet of the front-end catalytic converter is measured by the temperature sensor T4, the temperature of the inlet of the particulate matter trap is measured by the temperature sensor T5, the temperature of the inlet of the rear-end catalytic converter is measured by the temperature sensor T6, and the rear-end urea nozzle is DM2.

In one embodiment of the present application, after entering the first carbon removal mode, the method further includes: and when at least one of the first condition, the second condition, the third condition, and the fourth condition is not satisfied, exiting the first carbon removal mode. In this embodiment, the first decarbonization mode is exited when at least one of the first condition, the second condition, the third condition, and the fourth condition is not satisfied, i.e., when the dual SCR system has a high ability to reduce nitrogen oxides in the engine exhaust and the temperature in the particulate trap satisfies a temperature requirement for proper passive regeneration.

In one embodiment of the present application, the second carbon removing mode includes a first carbon removing mode and a second carbon removing mode, the first carbon removing mode is a mode of controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping a temperature at an inlet of the particulate matter trap greater than the preset temperature value and less than an active regeneration temperature threshold, the active regeneration temperature threshold is a maximum temperature value satisfying a requirement that the passive regeneration of the particulate matter trap occurs, and is a minimum temperature value satisfying a requirement that the active regeneration of the particulate matter trap occurs, the second carbon removing mode is a mode of controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping a temperature at an inlet of the particulate matter trap greater than the active regeneration temperature threshold, and if the carbon load is greater than the first preset value, entering the first carbon removing mode to perform the carbon removing or the second carbon removing modeRemoving carbon, further comprising: entering the first carbon removal sub-mode when the carbon loading is greater than the second preset value and less than or equal to a third preset value, wherein the second preset value is less than the third preset value; and entering the second carbon removal sub-mode when the carbon loading is greater than the third preset value and less than or equal to a fourth preset value, wherein the third preset value is less than the fourth preset value. In this embodiment, as shown in FIG. 3, the carbon loading M in the particulate trap _soot Under the condition that the carbon content is larger than a second preset value Limit2 and smaller than or equal to a third preset value Limit3, entering a first carbon removal sub-mode, and carrying out carbon content M on the particulate matter trap _soot And under the condition that the carbon content is larger than a third preset value Limit3 and smaller than or equal to a fourth preset value Limit4, entering a second carbon removal sub-mode, namely selecting different carbon removal modes according to the carbon content of the particulate matter catcher so as to realize grading control of the carbon content of the particulate matter catcher.

The particulate matter catcher is used for carrying out active regeneration, and oxygen and carbon particles are subjected to chemical reaction at high temperature to generate carbon dioxide, so that the purpose of removing carbon is achieved.

In one embodiment of the present application, after entering the first carbon removal sub-mode, the method further includes: a first control step of controlling the fuel injector to inject fuel into the oxidation catalyst; an acquisition step of acquiring passive regeneration time, wherein the passive regeneration time is the time when the second temperature value is larger than the preset temperature value; a first judging step of judging whether the passive regeneration time is equal to a preset time; an iteration step of sequentially repeating the obtaining step and the first judging step at least once until the passive regeneration time is equal to a preset time; when the passive regeneration time is equal to the preset time, controlling the fuel injector to stop injecting fuel into the oxidation catalytic converter; a second judging step of judging whether the carbon loading at the current time is smaller than a fifth preset value when the passive regeneration time is equal to the preset time; sequentially repeating the first control step, the iterating step, and the second determining step at least once until the carbon loading is less than the first A fifth preset value; and when the carbon loading is smaller than the fifth preset value, exiting the first carbon removing sub-mode. In this embodiment, as shown in FIG. 3, the carbon loading M of the particulate trap _soot Under the condition that the temperature is larger than a second preset value Limit2 and smaller than or equal to a third preset value Limit3, entering a first carbon removing sub-mode, controlling the fuel injector to spray fuel into the oxidation catalytic converter, improving the temperature of the inlet of the particle catcher by the oxidation catalytic converter, as shown in fig. 4, the solid line is a preset temperature value of the temperature of the inlet of the particle catcher, the dotted line is an actual temperature of the inlet of the particle catcher, namely a second temperature value, when the passive regeneration time is equal to a preset time, namely a time when the preset second temperature value exceeds the preset temperature value is equal to a preset time, controlling the fuel injector to stop spraying fuel, starting to decrease the average temperature of the particle catcher, and because the heat capacity of the particle catcher is larger, the temperature of the oxidation catalytic converter is reduced for a long time, a large amount of nitrogen dioxide is generated by quickly reducing the temperature of the oxidation catalytic converter, the amount of nitrogen dioxide at the inlet of the particle catcher is increased, the particle catcher is utilized to carry out passive regeneration and quickly reduce the carbon loading in the particle catcher, the periodical temperature increase and the generation of nitrogen dioxide can realize the optimal control of the regeneration oil quantity of the particle catcher and the regeneration efficiency of the particle catcher, and when the carbon loading is smaller than a fifth preset value Limit5, the carbon loading of the particle catcher is determined to not influence the normal exhaust of an engine, the first carbon removal sub-mode is exited.

In one embodiment of the present application, after entering the second carbon removal sub-mode, the method further includes: controlling the fuel injector to inject fuel into the oxidation catalytic converter; acquiring the carbon loadings of the plurality of continuous time nodes; a third judging step of judging whether the target carbon loading is smaller than or equal to a sixth preset value, wherein the target carbon loading is the carbon loading of any one of the time nodes; repeating the third judging step at least once until the target carbon loading is smaller than or equal to the sixth preset value; the target carbon loading is less than or equal to the aboveAnd under the condition of a sixth preset value, exiting the second carbon removing sub mode. In this embodiment, as shown in FIG. 3, the carbon loading M in the particulate trap _soot And under the condition that the carbon content is larger than a third preset value Limit3 and smaller than or equal to a fourth preset value Limit4, after entering a second carbon removal sub-mode, controlling the fuel injector to spray fuel oil into the oxidation catalytic converter, after the temperature of the inlet of the front catalytic converter is larger than an active regeneration temperature threshold, carrying out active regeneration by the front catalytic converter, removing carbon particles in the particle catcher through active regeneration, reducing the carbon content of the particle catcher, and when the target carbon content is smaller than a sixth preset value Limit6, namely, determining that the carbon content of the particle catcher cannot influence normal exhaust of an engine, exiting the second carbon removal sub-mode.

In one embodiment of the present application, the second exhaust pipe further includes a ninth end, the dual SCR device further includes a post urea nozzle, the post urea nozzle is connected to the ninth end, and after entering the second carbon removal sub-mode, the method further includes: the injection amount of the pre-urea nozzle is increased and the injection amount of the post-urea nozzle is reduced or maintained. In this embodiment, as shown in FIG. 3, the carbon loading M in the particulate trap _soot Under the condition that the exhaust gas temperature is larger than a third preset value Limit3 and smaller than or equal to a fourth preset value Limit4, after entering a second carbon removal sub-mode, the injection quantity of the front urea nozzle is increased, the injection quantity of the rear urea nozzle is reduced or kept, the urea utilization rate of the particulate matter trap during active regeneration, the conversion efficiency of the front catalytic converter and the conversion efficiency of the rear catalytic converter are improved, and the capability of the dual SCR system for reducing nitrogen and oxygen compounds in engine exhaust gas is ensured to be higher when the particulate matter trap performs active regeneration.

In one embodiment of the present application, obtaining the carbon loading of the particulate trap includes: calculating a first soot mass flow according to the rotation speed of the engine and the fuel injection quantity of the engine, wherein the first soot mass flow is the mass flow of soot discharged by the engine; calculating a second soot mass flow rate based on a first conversion efficiency, a second conversion efficiency, and the first soot mass flow rate, wherein the first conversion efficiency is a conversion efficiency of the pre-catalytic converter, the second conversion efficiency is a conversion efficiency of the oxidation catalytic converter, the second soot mass flow rate is a product of the soot mass flow rate discharged from the engine and a first preliminary conversion efficiency, the first preliminary conversion efficiency is a product of a second preliminary conversion efficiency and a third preliminary conversion efficiency, the second preliminary conversion efficiency is a difference between 100% and the first conversion efficiency, and the third preliminary conversion efficiency is a difference between 100% and the second conversion efficiency; and calculating an integral of a third soot mass flow rate over time to obtain the carbon loading, wherein the third soot mass flow rate is a difference value between the second soot mass flow rate and a fourth soot mass flow rate, and the fourth soot mass flow rate is a sum of the soot mass flow rate generated by passive regeneration of the particulate matter trap and the soot mass flow rate generated by active regeneration of the particulate matter trap. In this embodiment, the second soot mass flow is the soot mass flow at the inlet of the particulate trap, and the second soot mass flow is the product of the difference between 100% and the first conversion efficiency, the difference between 100% and the second conversion efficiency, and the first soot mass flow, i.e. since the soot mass flow mainly exists in the form of a soot mass flow core and a peripherally adsorbed SOF, when calculating the second soot mass flow, the function of removing the SOF in the mass flow of the soot discharged from the engine by the pre-catalyst and the oxidation catalyst needs to be considered, and the soot mass flow at the inlet of the particulate trap subtracts the soot mass flow generated by the passive regeneration of the particulate trap and the soot mass flow generated by the active regeneration of the particulate trap, and the carbon load of the particulate trap is obtained at the present time after integration over time.

When it is required to be described, the upper first conversion efficiency is the ratio of the concentration of the SOF at the inlet of the pre-catalytic converter to the concentration of the SOF at the outlet of the pre-catalytic converter, and the second conversion efficiency is the ratio of the concentration of the SOF at the inlet of the oxidation catalytic converter to the concentration of the SOF at the outlet of the oxidation catalytic converter.

In one embodiment of the present application, calculating the first soot mass flow according to the rotational speed of the engine and the injection amount of the engine includes: inquiring a soot emission table according to the rotating speed of the engine and the fuel injection quantity of the engine to obtain steady-state soot mass flow and a reference air-fuel ratio; obtaining a first correction amount based on the reference air-fuel ratio and an actual air-fuel ratio look-up air-fuel ratio table, wherein the actual air-fuel ratio is a ratio of an airspeed of the engine to an injection amount of the engine; and calculating the product of the steady-state soot mass flow and the first correction amount to obtain the first soot mass flow. In this embodiment, the first soot mass flow is the product of the steady-state soot mass flow and the first correction amount, i.e. the calculation of the mass flow of soot exiting the actual engine of the engine needs to take into account the air-fuel ratio, i.e. the actual combustion situation of the fuel.

In one embodiment of the application, calculating the second soot mass flow based on the first conversion efficiency, the second conversion efficiency, and the first soot mass flow comprises: inquiring a conversion efficiency table of the pre-catalytic converter according to the temperature of the pre-catalytic converter and the airspeed of the pre-catalytic converter to obtain the first conversion efficiency; inquiring a conversion efficiency table of the oxidation catalytic converter according to the temperature of the oxidation catalytic converter and the airspeed of the oxidation catalytic converter to obtain the second conversion efficiency; and calculating the mass flow of the soot at the inlet of the particulate filter to obtain the second mass flow of soot. In this embodiment, the first conversion efficiency is related to the temperature and space velocity of the pre-catalytic converter, i.e., the catalyst removal function of the pre-catalytic converter for SOF is related to the temperature and space velocity of the pre-catalytic converter, and the second conversion efficiency is related to the temperature and space velocity of the oxidation catalytic converter, i.e., the catalyst removal function of the oxidation catalytic converter for SOF is related to the temperature and space velocity of the oxidation catalytic converter.

In one embodiment of the present application, before calculating the integral of the third soot mass flow over time to obtain the carbon loading, the method further comprises: inquiring a passive regeneration conversion efficiency table of the particulate matter trap according to the nitrogen dioxide mass in the particulate matter trap, the average temperature of the particulate matter trap, the flow rate of the nitrogen oxide compound in the particulate matter trap and the second soot mass flow rate to obtain the soot mass flow rate generated by passive regeneration of the particulate matter trap, wherein the nitrogen dioxide mass in the particulate matter trap is the sum of a first mass and a second mass, the first mass is the difference value between the nitrogen dioxide mass in the exhaust gas discharged by the engine and the nitrogen dioxide mass consumed in the pre-catalytic converter, and the second mass is the sum of the nitrogen dioxide mass generated in the oxidation catalytic converter and the nitrogen dioxide mass supplemented in the particulate matter trap; and inquiring an active regeneration conversion efficiency table of the particulate matter trap according to the inlet oxygen concentration of the particulate matter trap, the average temperature of the particulate matter trap and the second soot mass flow to obtain the soot mass flow generated by the active regeneration of the particulate matter trap. In this embodiment, the passive regeneration conversion efficiency table is queried according to each parameter affecting the passive regeneration of the particulate matter trap, so as to obtain the mass flow of soot generated by the passive regeneration of the particulate matter trap, and the active regeneration conversion efficiency table is queried according to each parameter affecting the active regeneration of the particulate matter trap, so as to obtain the mass flow of soot generated by the active regeneration of the particulate matter trap.

The embodiment of the application also provides a device for controlling the carbon loading capacity of the particle catcher, and the device for controlling the carbon loading capacity of the particle catcher can be used for executing the method for controlling the carbon loading capacity of the particle catcher. The following describes a control device for carbon loading of a particulate matter trap provided by an embodiment of the present application.

FIG. 5 is a schematic diagram of a particulate trap carbon loading control device according to an embodiment of the present application. As shown in fig. 5, the apparatus includes:

an acquisition unit 10 that acquires a carbon loading of the particulate matter trap;

the control unit 20 enters a first carbon removal mode for removing carbon or a second carbon removal mode for removing carbon when the carbon loading is greater than a first preset value, wherein the first carbon removal mode is a mode for reducing the injection amount of the pre-urea nozzle, and the second carbon removal mode is a mode for controlling the injector to inject fuel into the oxidation catalytic converter and keeping the temperature at the inlet of the particulate matter trap greater than a preset temperature value.

In the control device for the carbon loading of the particulate matter catcher, an acquisition unit acquires the carbon loading of the particulate matter catcher; and a control unit for entering a first carbon removal mode or a second carbon removal mode for removing carbon when the carbon loading is greater than a first preset value, wherein the first carbon removal mode is a mode for reducing the injection quantity of the front urea nozzle, and the second carbon removal mode is a mode for controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping the temperature at the inlet of the particulate matter catcher greater than a preset temperature value. When the carbon loading capacity is larger than a first preset value, the device enters a first carbon removal mode or a second carbon removal mode to remove carbon from the particle catcher, the first carbon removal mode reduces the injection quantity of the front urea injection nozzle to enable the catalytic reduction reaction of the front catalytic converter to convert nitrogen dioxide into nitrogen to be weakened, the quantity of nitrogen dioxide at the inlet of the particle catcher is increased to enable the particle catcher to perform passive regeneration, the carbon loading capacity of the particle catcher is reduced, the second carbon removal mode controls the injector to inject fuel into the oxidation catalytic converter to oxidize the fuel, the temperature of the inlet of the particle catcher is further increased, the oxidation catalytic converter converts nitrogen monoxide into nitrogen dioxide in the heating process to be enhanced, the quantity of nitrogen dioxide at the inlet of the particle catcher is further increased, the particle catcher performs passive regeneration, the carbon loading capacity of the particle catcher is rapidly reduced, the temperature at the inlet of the particle catcher exceeds the minimum temperature of active regeneration of the particle catcher, and the problem of the prior art that the passive regeneration of the front catalytic converter of the device reduces the carbon loading capacity of the particle catcher is solved.

In one embodiment of the present application, the above controlThe unit comprises a control module, an acquisition module and a first execution module, wherein the control module is used for entering the first carbon removal mode under the condition that the carbon loading is larger than a first preset value and smaller than or equal to a second preset value, and the first preset value is smaller than the second preset value; the acquisition module is configured to acquire a first temperature value, a second temperature value and a third temperature value, where the first temperature value is a temperature of the inlet of the front-end catalytic converter, the second temperature value is a temperature of the inlet of the particulate matter trap, and the third temperature value is a temperature of the inlet of the rear-end catalytic converter; the first execution module is configured to reduce the injection amount of the pre-urea nozzle and control the particulate matter trap to perform passive regeneration when a first condition, a second condition, a third condition, and a fourth condition are satisfied simultaneously, where the first condition is that the first temperature value is within a first temperature range, the second condition is that the second temperature value is within a second temperature range, the third condition is that the third temperature value is within a third temperature range, the fourth condition is that the conversion efficiency is greater than a preset efficiency value, the conversion efficiency is a difference between 100% and a first ratio, and the first ratio is a ratio of a nitrogen oxide compound at an inlet of the pre-catalytic converter to the nitrogen oxide compound at an outlet of the post-catalytic converter. In this embodiment, as shown in FIG. 3, the carbon loading M in the particulate trap _soot Under the condition that the temperature in the particulate matter trap meets the temperature requirement for proper passive regeneration, the injection quantity of a front urea nozzle is reduced, namely the conversion efficiency of the front catalytic converter is reduced, namely the catalytic reduction reaction of converting nitrogen dioxide in the front catalytic converter into nitrogen is weakened, the concentration of the nitrogen dioxide at the inlet of the particulate matter trap is improved, the particulate matter trap is further subjected to passive regeneration, and the particulate matter trap is cleaned through passive regeneration under the condition that the two SCR systems have higher capability of reducing nitrogen oxide in engine tail gas and the temperature in the particulate matter trap meets the temperature requirement for proper passive regeneration after entering the first carbon removal mode and the first carbon removal mode is simultaneously met under the condition that the first carbon removal mode is larger than a first preset value Limit1 and smaller than or equal to a second preset value Limit2The carbon particles reduce the carbon loading of the particle catcher, increase the injection quantity of the rear urea nozzle while reducing the injection quantity of the front urea nozzle, improve the conversion efficiency of the rear catalytic converter, and ensure that the double SCR system has higher capability of reducing nitrogen-oxygen compounds in the tail gas of the engine.

It should be further noted that, as shown in fig. 2, the temperature of the inlet of the front-end catalytic converter is measured by the temperature sensor T4, the temperature of the inlet of the particulate matter trap is measured by the temperature sensor T5, the temperature of the inlet of the rear-end catalytic converter is measured by the temperature sensor T6, and the rear-end urea nozzle is DM 2.

In an embodiment of the present application, the control device for a carbon loading of a particulate matter trap further includes a first execution unit configured to exit the first carbon removal mode if at least one of the first condition, the second condition, the third condition, and the fourth condition is not satisfied. In this embodiment, the first decarbonization mode is exited when at least one of the first condition, the second condition, the third condition, and the fourth condition is not satisfied, i.e., when the dual SCR system has a high ability to reduce nitrogen oxides in the engine exhaust and the temperature in the particulate trap satisfies a temperature requirement for proper passive regeneration.

In one embodiment of the present application, the control unit further includes a second execution module and a third execution module, where the second execution module is configured to load the carbon Entering the first carbon removal sub-mode when the amount is greater than the second preset value and less than or equal to a third preset value, wherein the second preset value is less than the third preset value; the third execution module is configured to enter the second carbon removal sub-mode when the carbon loading is greater than the third preset value and less than or equal to a fourth preset value, where the third preset value is less than the fourth preset value. In this embodiment, as shown in FIG. 3, the carbon loading M in the particulate trap _soot Under the condition that the carbon content is larger than a second preset value Limit2 and smaller than or equal to a third preset value Limit3, entering a first carbon removal sub-mode, and carrying out carbon content M on the particulate matter trap _soot And under the condition that the carbon content is larger than a third preset value Limit3 and smaller than or equal to a fourth preset value Limit4, entering a second carbon removal sub-mode, namely selecting different carbon removal modes according to the carbon content of the particulate matter catcher so as to realize grading control of the carbon content of the particulate matter catcher.

In one embodiment of the present application, the control device for a carbon load of a particulate matter trap further includes a first control unit, a first obtaining unit, a first judging unit, a first iteration unit, a second control unit, a second judging unit, a second iteration unit, and a second executing unit, where the first control unit is configured to control the fuel injector to inject fuel into the oxidation catalytic converter; the first obtaining unit is configured to obtain a passive regeneration time, where the passive regeneration time is a time when the second temperature value is greater than the preset temperature value; the first judging unit is used for judging whether the passive regeneration time is equal to a preset time or not; the first iteration unit is used for sequentially repeating the obtaining step and the first judging step at least once until the passive regeneration time is equal to a preset time; the second control unit is used for controlling the fuel injector to stop injecting fuel into the oxidation catalytic converter when the passive regeneration time is equal to the preset time; the second judging unit is used for passively restarting the system When the generation time is equal to the preset time, judging whether the carbon loading at the current time is smaller than a fifth preset value; the second iteration unit is configured to sequentially repeat the first control step, the iteration step, and the second determination step at least once until the carbon loading is smaller than the fifth preset value; the second execution unit is configured to exit the first carbon removal sub-mode when the carbon loading is less than the fifth preset value. In this embodiment, as shown in FIG. 3, the carbon loading M of the particulate trap _soot Under the condition that the temperature is larger than a second preset value Limit2 and smaller than or equal to a third preset value Limit3, entering a first carbon removing sub-mode, controlling the fuel injector to spray fuel into the oxidation catalytic converter, improving the temperature of the inlet of the particle catcher by the oxidation catalytic converter, as shown in fig. 4, the solid line is a preset temperature value of the temperature of the inlet of the particle catcher, the dotted line is an actual temperature of the inlet of the particle catcher, namely a second temperature value, when the passive regeneration time is equal to a preset time, namely a time when the preset second temperature value exceeds the preset temperature value is equal to a preset time, controlling the fuel injector to stop spraying fuel, starting to decrease the average temperature of the particle catcher, and because the heat capacity of the particle catcher is larger, the temperature of the oxidation catalytic converter is reduced for a long time, a large amount of nitrogen dioxide is generated by quickly reducing the temperature of the oxidation catalytic converter, the amount of nitrogen dioxide at the inlet of the particle catcher is increased, the particle catcher is utilized to carry out passive regeneration and quickly reduce the carbon loading in the particle catcher, the periodical temperature increase and the generation of nitrogen dioxide can realize the optimal control of the regeneration oil quantity of the particle catcher and the regeneration efficiency of the particle catcher, and when the carbon loading is smaller than a fifth preset value Limit5, the carbon loading of the particle catcher is determined to not influence the normal exhaust of an engine, the first carbon removal sub-mode is exited.

In an embodiment of the present application, the control device for a carbon load of a particulate matter trap further includes a third control unit, a second obtaining unit, a third judging unit, a third iteration unit, and a third executing unit, where the third control unit is configured to controlThe fuel injector injects fuel into the oxidation catalytic converter; the second obtaining unit is configured to obtain the carbon loadings of the plurality of continuous time nodes; the third judging unit is configured to judge whether a target carbon loading is less than or equal to a sixth preset value, where the target carbon loading is a carbon loading of any one of the time nodes; the third iteration unit is configured to repeat the third determining step at least once until the target carbon loading is less than or equal to the sixth preset value; the third execution unit is configured to exit the second carbon removal sub-mode if the target carbon loading is less than or equal to the sixth preset value. In this embodiment, as shown in FIG. 3, the carbon loading M in the particulate trap _soot And under the condition that the carbon content is larger than a third preset value Limit3 and smaller than or equal to a fourth preset value Limit4, after entering a second carbon removal sub-mode, controlling the fuel injector to spray fuel oil into the oxidation catalytic converter, after the temperature of the inlet of the front catalytic converter is larger than an active regeneration temperature threshold, carrying out active regeneration by the front catalytic converter, removing carbon particles in the particle catcher through active regeneration, reducing the carbon content of the particle catcher, and when the target carbon content is smaller than a sixth preset value Limit6, namely, determining that the carbon content of the particle catcher cannot influence normal exhaust of an engine, exiting the second carbon removal sub-mode.

In one embodiment of the present application, the control device for a carbon load of a particulate matter trap further includes a fourth execution unit for increasing the injection amount of the pre-urea nozzle and reducing or maintaining the injection amount of the post-urea nozzle. In this embodiment, as shown in FIG. 3, the carbon loading M in the particulate trap _soot Under the condition that the injection quantity of the front urea nozzle is increased and the injection quantity of the rear urea nozzle is reduced or kept after entering the second carbon removal sub-mode under the condition that the injection quantity is larger than a third preset value Limit3 and smaller than or equal to a fourth preset value Limit4, the urea utilization rate of the front catalytic converter and the conversion efficiency of the rear catalytic converter when the particle catcher is subjected to active regeneration are improved, and the double SCR system is ensured to have higher reduction of nitrogen-oxygen compounds in engine tail gas when the particle catcher is subjected to active regenerationCapability.

In one embodiment of the present application, the obtaining unit includes a first calculating module, a second calculating module, and a third calculating module, where the first calculating module is configured to calculate a first mass flow of soot according to a rotational speed of the engine and an injection amount of the engine, and the first mass flow of soot is a mass flow of soot discharged by the engine; the second calculation module is configured to calculate a second soot mass flow rate based on a first conversion efficiency, a second conversion efficiency, and the first soot mass flow rate, the first conversion efficiency being a conversion efficiency of the pre-catalytic converter, the second conversion efficiency being a conversion efficiency of the oxidation catalytic converter, the second soot mass flow rate being a product of the soot mass flow rate discharged from the engine and a first preliminary conversion efficiency, the first preliminary conversion efficiency being a product of a second preliminary conversion efficiency and a third preliminary conversion efficiency, the second preliminary conversion efficiency being a difference between 100% and the first conversion efficiency, and the third preliminary conversion efficiency being a difference between 100% and the second conversion efficiency; the third calculation module is configured to calculate an integral of a third soot mass flow rate over time to obtain the carbon loading, where the third soot mass flow rate is a difference between the second soot mass flow rate and a fourth soot mass flow rate, and the fourth soot mass flow rate is a sum of the soot mass flow rate generated by the passive regeneration of the particulate trap and the soot mass flow rate generated by the active regeneration of the particulate trap. In this embodiment, the second soot mass flow is the soot mass flow at the inlet of the particulate trap, and the second soot mass flow is the product of the difference between 100% and the first conversion efficiency, the difference between 100% and the second conversion efficiency, and the first soot mass flow, i.e. since the soot mass flow mainly exists in the form of a soot mass flow core and a peripherally adsorbed SOF, when calculating the second soot mass flow, the function of removing the SOF in the mass flow of the soot discharged from the engine by the pre-catalyst and the oxidation catalyst needs to be considered, and the soot mass flow at the inlet of the particulate trap subtracts the soot mass flow generated by the passive regeneration of the particulate trap and the soot mass flow generated by the active regeneration of the particulate trap, and the carbon load of the particulate trap is obtained at the present time after integration over time.

In one embodiment of the present application, the first calculation module includes a first query sub-module, a second query sub-module, and a first calculation sub-module, where the first query sub-module is configured to query a soot emission table according to a rotational speed of the engine and an injection amount of the engine, to obtain a steady-state soot mass flow and a reference air-fuel ratio; the second inquiring submodule is used for inquiring an air-fuel ratio table according to the reference air-fuel ratio and an actual air-fuel ratio to obtain a first correction amount, wherein the actual air-fuel ratio is the ratio of the airspeed of the engine to the fuel injection quantity of the engine; the first calculation submodule is used for calculating the product of the steady-state soot mass flow and the first correction quantity to obtain the first soot mass flow. In this embodiment, the first soot mass flow is the product of the steady-state soot mass flow and the first correction amount, i.e. the calculation of the mass flow of soot exiting the actual engine of the engine needs to take into account the air-fuel ratio, i.e. the actual combustion situation of the fuel.

In an embodiment of the present application, the second calculation module includes a third query sub-module, a fourth query sub-module, and the second calculation sub-module, where the third query sub-module is configured to query a conversion efficiency table of the pre-catalytic converter according to a temperature of the pre-catalytic converter and an airspeed of the pre-catalytic converter, to obtain the first conversion efficiency; the fourth query submodule is used for querying a conversion efficiency table of the oxidation catalytic converter according to the temperature of the oxidation catalytic converter and the airspeed of the oxidation catalytic converter to obtain the second conversion efficiency; the second calculation submodule is used for calculating the soot mass flow at the inlet of the particulate filter to obtain the second soot mass flow. In this embodiment, the first conversion efficiency is related to the temperature and space velocity of the pre-catalytic converter, i.e., the catalyst removal function of the pre-catalytic converter for SOF is related to the temperature and space velocity of the pre-catalytic converter, and the second conversion efficiency is related to the temperature and space velocity of the oxidation catalytic converter, i.e., the catalyst removal function of the oxidation catalytic converter for SOF is related to the temperature and space velocity of the oxidation catalytic converter.

In one embodiment of the present application, the control device for a carbon load of a particulate matter trap further includes a first query unit and a second query unit, where the first query unit is configured to query a passive regeneration conversion efficiency table of the particulate matter trap according to a nitrogen dioxide mass in the particulate matter trap, an average temperature of the particulate matter trap, a flow rate of the nitrogen oxide in the particulate matter trap, and the second soot mass flow rate, to obtain the soot mass flow rate generated by passive regeneration of the particulate matter trap, the nitrogen dioxide mass in the particulate matter trap is a sum of a first mass and a second mass, the first mass is a difference between the nitrogen dioxide mass in the exhaust gas discharged from the engine and the nitrogen dioxide mass consumed in the pre-catalytic converter, and the second mass is a sum of the nitrogen dioxide mass generated in the oxidation catalytic converter and the supplemental nitrogen dioxide mass in the particulate matter trap; and the second query unit is used for querying an active regeneration conversion efficiency table of the particulate matter trap according to the inlet oxygen concentration of the particulate matter trap, the average temperature of the particulate matter trap and the second soot mass flow rate to obtain the soot mass flow rate generated by the active regeneration of the particulate matter trap. In this embodiment, the passive regeneration conversion efficiency table is queried according to each parameter affecting the passive regeneration of the particulate matter trap, so as to obtain the mass flow of soot generated by the passive regeneration of the particulate matter trap, and the active regeneration conversion efficiency table is queried according to each parameter affecting the active regeneration of the particulate matter trap, so as to obtain the mass flow of soot generated by the active regeneration of the particulate matter trap.

The control device for the carbon loading of the particulate matter trap comprises a processor and a memory, wherein the acquisition unit, the control unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one inner core parameters, and the problem of passive regeneration quantity reduction of the particulate matter catcher caused by catalytic reduction reaction of the pre-catalytic converter in the prior art is solved by adjusting the inner core parameters.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a storage medium, wherein a program is stored on the storage medium, and the program is executed by a processor to realize the control method of the carbon loading of the particulate matter trap.

The embodiment of the invention provides a processor, which is used for running a program, wherein the control method of the carbon load of the particulate matter trap is executed when the program runs.

The embodiment of the application provides a control system for carbon loading capacity of a particulate matter catcher, which comprises the following steps: an engine, a dual SCR device, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods described above, the processor performing at least the following steps when executed by the processor:

step S101, obtaining the carbon loading of the particulate matter catcher;

The device herein may be a server, PC, PAD, cell phone, etc.

The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with at least the following method steps:

Step S101, obtaining the carbon loading of the particulate matter catcher;

In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units may be a logic function division, and there may be another division manner when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units described above, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the above-mentioned method of the various embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

1) In the method for controlling the carbon loading of the particulate matter trap, firstly, the carbon loading of the particulate matter trap is obtained; and then, under the condition that the carbon loading is larger than a first preset value, entering a first carbon removal mode for carbon removal or a second carbon removal mode for carbon removal, wherein the first carbon removal mode is a mode for reducing the injection quantity of the front urea nozzle, and the second carbon removal mode is a mode for controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping the temperature at the inlet of the particulate matter catcher larger than a preset temperature value. When the carbon loading is larger than a first preset value, the method enters a first carbon removal mode or a second carbon removal mode to remove carbon from the particle catcher, the first carbon removal mode reduces the injection quantity of the front urea injection nozzle to weaken the catalytic reduction reaction of the front catalytic converter for converting nitrogen dioxide into nitrogen, improves the quantity of nitrogen dioxide at the inlet of the particle catcher to enable the particle catcher to perform passive regeneration, reduces the carbon loading of the particle catcher, controls the fuel injector to inject fuel into the oxidation catalytic converter, oxidizes the fuel by the oxidation catalytic converter, improves the temperature of the inlet of the particle catcher, enhances the oxidation reaction of nitric oxide into nitrogen dioxide in the temperature increasing process, further improves the quantity of nitrogen dioxide at the inlet of the particle catcher, enables the particle catcher to perform passive regeneration, rapidly reduces the carbon loading of the particle catcher, and reduces the carbon loading of the particle catcher by active regeneration at the temperature of the inlet of the particle catcher beyond the lowest temperature of the active regeneration of the particle catcher.

2) In the control device for the carbon loading of the particulate matter catcher, an acquisition unit acquires the carbon loading of the particulate matter catcher; and a control unit for entering a first carbon removal mode or a second carbon removal mode for removing carbon when the carbon loading is greater than a first preset value, wherein the first carbon removal mode is a mode for reducing the injection quantity of the front urea nozzle, and the second carbon removal mode is a mode for controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping the temperature at the inlet of the particulate matter catcher greater than a preset temperature value. When the carbon loading capacity is larger than a first preset value, the device enters a first carbon removal mode or a second carbon removal mode to remove carbon from the particle catcher, the first carbon removal mode reduces the injection quantity of the front urea injection nozzle to enable the catalytic reduction reaction of the front catalytic converter to convert nitrogen dioxide into nitrogen to be weakened, the quantity of nitrogen dioxide at the inlet of the particle catcher is increased to enable the particle catcher to perform passive regeneration, the carbon loading capacity of the particle catcher is reduced, the second carbon removal mode controls the injector to inject fuel into the oxidation catalytic converter to oxidize the fuel, the temperature of the inlet of the particle catcher is further increased, the oxidation catalytic converter converts nitrogen monoxide into nitrogen dioxide in the heating process to be enhanced, the quantity of nitrogen dioxide at the inlet of the particle catcher is further increased, the particle catcher performs passive regeneration, the carbon loading capacity of the particle catcher is rapidly reduced, the temperature at the inlet of the particle catcher exceeds the minimum temperature of active regeneration of the particle catcher, and the problem of the prior art that the passive regeneration of the front catalytic converter of the device reduces the carbon loading capacity of the particle catcher is solved.

3) The control system for the carbon loading of the particulate matter trap comprises: an engine, a dual SCR device, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a method for performing any of the above, the system entering a first carbon removal mode or a second carbon removal mode to remove carbon from the particulate trap when the carbon loading is greater than a first preset value, the first carbon removal mode being to reduce a catalytic reduction reaction of the pre-catalytic converter to nitrogen by reducing an injection amount of the pre-urea nozzle, increasing an amount of nitrogen dioxide at an inlet of the particulate trap, causing passive regeneration of the particulate trap, reducing a carbon loading of the particulate trap, the second carbon removal mode is to control the fuel injector to inject fuel into the oxidation catalytic converter, the oxidation catalytic converter oxidizes the fuel, the temperature of an inlet of the particle catcher is further improved, the oxidation reaction of converting nitric oxide into nitrogen dioxide in the temperature rising process of the oxidation catalytic converter is enhanced, the nitrogen dioxide amount of the inlet of the particle catcher is further improved, the particle catcher is subjected to passive regeneration, the carbon load of the particle catcher is rapidly reduced, the temperature of the inlet of the particle catcher exceeds the minimum temperature of the particle catcher for active regeneration, the particle catcher is subjected to active regeneration to reduce the carbon load of the particle catcher, and the system solves the problem that the passive regeneration amount of the particle catcher is reduced due to the catalytic reduction reaction of the front-end catalytic converter in the prior art.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The method for controlling the carbon loading of the particulate matter trap is characterized in that the double-SCR device comprises a pre-urea nozzle, a first exhaust pipe, a pre-catalytic converter, an oxidation catalytic converter, an oil sprayer and the particulate matter trap, wherein the first exhaust pipe comprises a first end, a second end and a third end, the oxidation catalytic converter comprises a fourth end, a fifth end and a sixth end, the first end is connected with a cylinder of an engine, the second end is connected with one end of the pre-catalytic converter, the pre-urea nozzle is connected with the third end, the other end of the pre-catalytic converter is connected with the fourth end, the fifth end is connected with one end of the particulate matter trap, and the oil sprayer is connected with the sixth end, and the method comprises:

acquiring a carbon loading of the particulate matter trap;

Under the condition that the carbon loading is larger than a first preset value, a first carbon removing mode is entered to remove carbon or a second carbon removing mode is entered to remove carbon, wherein the first carbon removing mode is a mode of reducing the injection quantity of the front urea nozzle, and the second carbon removing mode is a mode of controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping the temperature at the inlet of the particulate matter catcher larger than a preset temperature value.

2. The method of claim 1, wherein the dual SCR device further comprises a second exhaust pipe and a post-catalyst converter, the second exhaust pipe comprising a seventh end and an eighth end, the other end of the particulate trap being connected to the seventh end, the eighth end being connected to one end of the post-catalyst converter, entering the first carbon removal mode for carbon removal or the second carbon removal mode for carbon removal, comprising:

entering the first decarbonizing mode under the condition that the carbon loading is larger than a first preset value and smaller than or equal to a second preset value, wherein the first preset value is smaller than the second preset value;

acquiring a first temperature value, a second temperature value and a third temperature value, wherein the first temperature value is the temperature of the inlet of the front-end catalytic converter, the second temperature value is the temperature of the inlet of the particulate matter trap, and the third temperature value is the temperature of the inlet of the rear-end catalytic converter;

And under the condition that a first condition, a second condition, a third condition and a fourth condition are simultaneously met, the injection quantity of the pre-urea nozzle is reduced, the particulate matter trap is controlled to be passively regenerated, the first condition is that the first temperature value is in a first temperature range, the second condition is that the second temperature value is in a second temperature range, the third condition is that the third temperature value is in a third temperature range, the fourth condition is that the conversion efficiency is larger than a preset efficiency value, the conversion efficiency is a difference between 100% and a first ratio, and the first ratio is the ratio of the nitrogen oxide compound at the inlet of the pre-catalytic converter to the nitrogen oxide compound at the outlet of the post-catalytic converter.

3. The method of claim 2, wherein after entering the first carbon removal mode, the method further comprises:

and if at least one of the first condition, the second condition, the third condition and the fourth condition is not satisfied, exiting the first carbon removal mode.

4. The method of claim 2, wherein the second carbon removal mode includes a first carbon removal sub-mode and a second carbon removal sub-mode, the first carbon removal sub-mode being a mode that controls the fuel injector to inject fuel into the oxidation catalytic converter and maintains a temperature at an inlet of the particulate trap greater than the preset temperature value and less than an active regeneration temperature threshold, the active regeneration temperature threshold being a maximum temperature value that meets a requirement that the particulate trap be subjected to the passive regeneration and being a minimum temperature value that meets a requirement that the particulate trap be subjected to the active regeneration, the second carbon removal sub-mode being a mode that controls the fuel injector to inject fuel into the oxidation catalytic converter and maintains a temperature at the inlet of the particulate trap greater than the active regeneration temperature threshold, and with the carbon load greater than a first preset value, entering a first carbon removal mode to perform carbon removal or a second carbon removal mode to perform carbon removal, further comprising:

Entering the first carbon removal sub-mode when the carbon loading is greater than the second preset value and less than or equal to a third preset value, wherein the second preset value is less than the third preset value;

and entering the second carbon removal sub-mode under the condition that the carbon loading is larger than the third preset value and smaller than or equal to a fourth preset value, wherein the third preset value is smaller than the fourth preset value.

5. The method of claim 4, wherein after entering the first carbon removal sub-mode, the method further comprises:

a first control step of controlling the fuel injector to inject fuel into the oxidation catalyst;

an acquisition step of acquiring passive regeneration time, wherein the passive regeneration time is the time when the second temperature value is larger than the preset temperature value;

a first judging step of judging whether the passive regeneration time is equal to a preset time;

an iteration step, wherein the acquisition step and the first judgment step are sequentially repeated at least once until the passive regeneration time is equal to a preset time;

when the passive regeneration time is equal to the preset time, controlling the fuel injector to stop injecting fuel into the oxidation catalytic converter;

A second judging step of judging whether the carbon load at the current time is smaller than a fifth preset value when the passive regeneration time is equal to the preset time;

sequentially repeating the first control step, the iteration step and the second judgment step at least once until the carbon loading is smaller than the fifth preset value;

and when the carbon loading is smaller than the fifth preset value, exiting the first carbon removal sub-mode.

6. The method of claim 4, wherein after entering the second carbon removal sub-mode, the method further comprises:

controlling the fuel injector to inject fuel into the oxidation catalytic converter;

acquiring the carbon loadings of a plurality of continuous time nodes;

a third judging step of judging whether the target carbon loading is smaller than or equal to a sixth preset value, wherein the target carbon loading is the carbon loading of any one of the time nodes;

repeating the third judging step at least once until the target carbon loading is less than or equal to the sixth preset value; and under the condition that the target carbon loading is smaller than or equal to the sixth preset value, exiting the second carbon removal sub-mode.

7. The method of claim 5, wherein the second exhaust pipe further comprises a ninth end, the dual SCR device further comprising a post urea nozzle coupled to the ninth end, the method further comprising, after entering the second decarbonization sub-mode:

Increasing the injection amount of the pre-urea nozzle and decreasing or maintaining the injection amount of the post-urea nozzle.

8. The method of claim 2, wherein obtaining the carbon loading of the particulate trap comprises:

calculating a first soot mass flow according to the rotating speed of the engine and the oil injection quantity of the engine, wherein the first soot mass flow is the mass flow of soot discharged by the engine;

calculating a second soot mass flow rate from a first conversion efficiency, a second conversion efficiency and the first soot mass flow rate, the first conversion efficiency being a conversion efficiency of the pre-catalytic converter, the second conversion efficiency being a conversion efficiency of the oxidation catalytic converter, the second soot mass flow rate being a product of the soot mass flow rate discharged from the engine and a first preliminary conversion efficiency, the first preliminary conversion efficiency being a product of a second preliminary conversion efficiency and a third preliminary conversion efficiency, the second preliminary conversion efficiency being a difference between 100% and the first conversion efficiency, the third preliminary conversion efficiency being a difference between 100% and the second conversion efficiency;

And calculating the integral of third carbon smoke mass flow rate and time to obtain the carbon load, wherein the third carbon smoke mass flow rate is the difference value between the second carbon smoke mass flow rate and fourth carbon smoke mass flow rate, and the fourth carbon smoke mass flow rate is the sum of the carbon smoke mass flow rate generated by passive regeneration of the particulate matter trap and the carbon smoke mass flow rate generated by active regeneration of the particulate matter trap.

9. The method of claim 8, wherein calculating a first soot mass flow based on a rotational speed of the engine and an amount of fuel injected by the engine comprises:

inquiring a soot emission table according to the rotating speed of the engine and the fuel injection quantity of the engine to obtain steady-state soot mass flow and a reference air-fuel ratio;

obtaining a first correction amount according to the reference air-fuel ratio and an actual air-fuel ratio lookup air-fuel ratio table, wherein the actual air-fuel ratio is the ratio of the airspeed of the engine to the fuel injection amount of the engine;

and calculating the product of the steady-state soot mass flow and the first correction amount to obtain the first soot mass flow.

10. The method of claim 8, wherein calculating a second mass flow of soot from the first conversion efficiency, the second conversion efficiency, and the first mass flow of soot comprises:

Inquiring a conversion efficiency table of the pre-catalytic converter according to the temperature of the pre-catalytic converter and the airspeed of the pre-catalytic converter to obtain the first conversion efficiency;

inquiring a conversion efficiency table of the oxidation catalytic converter according to the temperature of the oxidation catalytic converter and the airspeed of the oxidation catalytic converter to obtain the second conversion efficiency;

and calculating the mass flow of the soot at the inlet of the particulate matter trap to obtain the second mass flow of the soot.

11. The method of claim 8, wherein prior to calculating the integral of the third soot mass flow over time to obtain the carbon loading, the method further comprises:

inquiring a passive regeneration conversion efficiency table of the particulate trap according to the nitrogen dioxide mass in the particulate trap, the average temperature of the particulate trap, the flow of the nitrogen oxide of the particulate trap and the second soot mass flow to obtain the soot mass flow generated by passive regeneration of the particulate trap, wherein the nitrogen dioxide mass in the particulate trap is the sum of a first mass and a second mass, the first mass is the difference value between the nitrogen dioxide mass in the exhaust gas discharged by the engine and the nitrogen dioxide mass consumed in the pre-catalytic converter, and the second mass is the sum of the nitrogen dioxide mass generated in the oxidation catalytic converter and the nitrogen dioxide mass supplemented in the particulate trap;

And inquiring an active regeneration conversion efficiency table of the particulate matter trap according to the inlet oxygen concentration of the particulate matter trap, the average temperature of the particulate matter trap and the second soot mass flow, so as to obtain the soot mass flow generated by the active regeneration of the particulate matter trap.

12. The utility model provides a controlling means of particulate matter trap carbon loading capacity, its characterized in that, two SCR devices include leading urea nozzle, first blast pipe, leading catalytic converter, oxidation catalytic converter, sprayer and particulate matter trap, first blast pipe includes first end, second end and third end, oxidation catalytic converter includes fourth end, fifth end and sixth end, first end is connected with the cylinder of engine, the second end with the one end of leading catalytic converter is connected, leading urea nozzle with the third end is connected, the other end of leading catalytic converter with the fourth end is connected, the fifth end with one end of particulate matter trap is connected, the sprayer with the sixth end is connected, the device includes:

an acquisition unit that acquires a carbon loading of the particulate matter trap;

and the control unit is used for entering a first carbon removal mode for carbon removal or a second carbon removal mode for carbon removal under the condition that the carbon loading is larger than a first preset value, wherein the first carbon removal mode is a mode for reducing the injection quantity of the front urea nozzle, and the second carbon removal mode is a mode for controlling the fuel injector to inject fuel into the oxidation catalytic converter and keeping the temperature at the inlet of the particulate matter catcher larger than a preset temperature value.

13. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program performs the method of any one of claims 1 to 11.

14. A processor for running a program, wherein the program when run performs the method of any one of claims 1 to 11.

15. A control system for particulate trap carbon loading, comprising: an engine, a dual SCR device, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing the method of any one of claims 1-11.