Control method and device for cleaning diesel particulate filter

Abstract

The application discloses a kind of diesel engine DPF ash removal control method and device, wherein the method comprises: according to the current operating state of engine, obtain DPF pressure difference;According to the current operating state of engine, obtain the pressure difference generated by ash and carbon particles;According to the current operating state of engine, obtain the pressure difference generated by ash;According to the pressure difference generated by ash, the first amount of ash deposition is calculated;Whether the first amount of ash deposition reaches ash removal threshold is judged;If the ash removal threshold is reached, active regeneration is triggered.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine aftertreatment technology, in particular to a control method and device for DPF ash removal of a diesel engine. BACKGROUND

[0002] Nitrogen oxides and particulate emissions are the main pollutants of diesel engines. In order to effectively inhibit the generation of the above two exhaust pollutants of diesel engines, the national six diesel engines generally use DOC, DPF and SCR aftertreatment devices. Among them, DPF is an indispensable key part for reducing particulate emissions. Diesel is combusted in the cylinder to produce PM emissions. When passing through the DPF, the DPF collects the particles inside the carrier. When the particles reach a certain amount, the regeneration strategy is triggered. Part of the particles produced by combustion in the cylinder is unburned soot, and the other part is ash, which mainly comes from two aspects: one is from the additives in the lubricating oil, and the other is from the fuel additive. Soot particles can be converted into gaseous emissions by regeneration strategy, but ash remains in the DPF after regeneration and cannot be burned. The ash deposited in the DPF reduces the effective filtration area of the DPF and reduces its filtration efficiency. At the same time, the ash makes the carbon particles contact with the catalyst, reducing its passive regeneration ability, which frequently triggers active regeneration request, resulting in increased engine fuel consumption and DPF performance degradation.

[0003] The existing ash removal control strategy triggers ash removal reminders based on a certain mileage, generally around 200,000 km, or calculates the ash accumulation based on the experience model in the laboratory through oil and fuel consumption, generally 35-40g / L. But these two control strategies are based on normal oil quality and normal oil consumption. However, in actual use, the quality of the oil is uneven, and the maintenance is not in place, resulting in a certain increase in oil consumption, which greatly increases the amount of ash accumulation. Under the existing ash removal strategy, the normal performance of the aftertreatment has been affected.

[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known. SUMMARY

[0005] The purpose of the present application is to provide a control method and device for DPF ash removal of a diesel engine, which improves the accuracy of ash accumulation calculation and improves the performance of the engine and aftertreatment.

[0006] To achieve the above purpose, in a first aspect, the present application provides a control method for DPF ash removal of a diesel engine, comprising:

[0007] According to the current engine operating state, the DPF pressure difference is obtained;

[0008] According to the current engine operating state, the pressure difference generated by ash and carbon particles is obtained;

[0009] According to the current engine operating state, the pressure difference generated by ash is obtained;

[0010] According to the pressure difference generated by ash, the first soot accumulation amount is calculated;

[0011] It is judged whether the first soot accumulation amount reaches the soot cleaning threshold value;

[0012] If the soot cleaning threshold value is reached, active regeneration is triggered.

[0013] In an embodiment of the present application, the control method for diesel engine DPF soot cleaning further comprises:

[0014] According to the current engine operating state, the fuel and oil consumption within the current soot cleaning mileage is obtained;

[0015] According to the relationship between the fuel and oil consumption and the soot accumulation amount model, the ash amount generated by the actual fuel and oil consumption is calculated;

[0016] Based on the first soot accumulation amount and the ash amount, the second soot accumulation amount is calculated;

[0017] It is judged whether the second soot accumulation amount reaches the soot cleaning threshold value;

[0018] If the soot cleaning threshold value is reached, soot cleaning reminder is triggered.

[0019] In a second aspect, the present application provides a control device for diesel engine DPF soot cleaning, comprising: a first acquisition module, a second acquisition module, a third acquisition module, a first calculation module, a first judgment module and a first trigger module. The first acquisition module is used to obtain the DPF pressure difference according to the current engine operating state; the second acquisition module is used to obtain the pressure difference generated by ash and carbon particles according to the current engine operating state; the third acquisition module is used to obtain the pressure difference generated by ash according to the current engine operating state; the first calculation module is used to calculate the first soot accumulation amount according to the pressure difference generated by ash; the first judgment module is used to judge whether the first soot accumulation amount reaches the soot cleaning threshold value; and the first trigger module is used to trigger active regeneration if the soot cleaning threshold value is reached.

[0020] In an embodiment of the present application, the control device for diesel engine DPF ash removal further comprises a fourth acquisition module, a second calculation module, a third calculation module, a second judgment module and a second triggering module. The fourth acquisition module is configured to acquire fuel and oil consumption within a current ash removal mileage according to a current operation state of the engine; the second calculation module is configured to calculate an ash amount generated by actual fuel and oil consumption according to a model relationship between the fuel and oil consumption and the ash amount; the third calculation module is configured to calculate a second ash amount based on the first ash amount and the ash amount; the second judgment module is configured to judge whether the second ash amount reaches an ash removal threshold; and the second triggering module is configured to trigger an ash removal reminder if the ash removal threshold is reached.

[0021] In a third aspect, the present application provides an electronic device, comprising:

[0022] at least one processor; and

[0023] a memory connected with the at least one processor in communication;

[0024] wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the control method for diesel engine DPF ash removal as described above.

[0025] In a fourth aspect, the present application provides a computer readable storage medium comprising a computer program and instructions, which, when executed on a computer, cause the computer to perform the control method for diesel engine DPF ash removal as described above.

[0026] Compared with the prior art, the control method and device for diesel engine DPF ash removal according to the present application, based on the original experience model based on the laboratory, the ash amount is calculated based on the oil and fuel consumption to trigger the ash removal reminder, and the differential pressure model is added based on the comparison between the ash amount determined based on the oil and fuel consumption model, the larger value of the two is the ash removal reminder strategy, which well adapts to the complex use environment and ensures that the aftertreatment and the engine can play its best performance of high efficiency, low fuel consumption and low emission. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a flowchart of a control method for diesel engine DPF ash removal in an embodiment of the present application;

[0028] Figure 2 is a structural schematic diagram of a control device for diesel engine DPF ash removal in an embodiment of the present application;

[0029] Figure 3 is a structural schematic diagram of an electronic device in an embodiment of the present application;

[0030] Figure 4 is a schematic diagram of the logic flow of the control method for diesel engine DPF ash cleaning according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of protection of the present application is not limited by the specific embodiments.

[0032] Unless otherwise clearly indicated, throughout the specification and claims, the term "comprise" or variations such as "comprises" or "comprising" will be understood to imply the inclusion of a stated element or group of elements but not the exclusion of any other element or group of elements.

[0033] Embodiment One

[0034] Figure 1 is a schematic diagram of the flow of a control method for diesel engine DPF ash cleaning according to Embodiment One of the present application, as shown in Figure 1 The control method for diesel engine DPF ash cleaning according to Embodiment One provides:

[0035] Step S100, obtaining the DPF pressure difference according to the current operating state of the engine;

[0036] Step S200, obtaining the pressure difference caused by ash and carbon particles according to the current operating state of the engine;

[0037] Step S300, obtaining the pressure difference caused by ash according to the current operating state of the engine;

[0038] Step S400, calculating a first ash accumulation amount according to the pressure difference caused by ash;

[0039] Step S500, determining whether the first ash accumulation amount reaches an ash cleaning threshold;

[0040] Step S600, if the ash cleaning threshold is reached, triggering active regeneration.

[0041] In this embodiment, the control method for diesel engine DPF ash cleaning further comprises:

[0042] Step S700, obtaining the fuel and oil consumption within the current ash cleaning mileage according to the current operating state of the engine;

[0043] Step S800, calculating an ash amount caused by actual fuel and oil consumption according to the relationship between the fuel and oil consumption and the ash accumulation amount model;

[0044] Step S900, calculating a second ash accumulation amount based on the first ash accumulation amount and the ash amount.

[0045] Step S1000, judging whether the second soot amount reaches a soot cleaning threshold value;

[0046] Step S1100, if the soot cleaning threshold value is reached, triggering a soot cleaning reminder.

[0047] In a specific embodiment, Figure 4 Figure 1 is a schematic diagram of a logic flow of a control method for diesel engine DPF soot cleaning according to an embodiment of the present application, as shown, the control method for diesel engine DPF soot cleaning comprises: Figure 4

[0048] Step one, according to the current running state of the engine, engine speed, throttle, exhaust flow, and DPF aftertreatment differential pressure sensor, the actual differential pressure of the current DPF is obtained;

[0049] Step two, according to the current running state of the engine, based on the model of the fresh state of the engine DPF, the differential pressure of the fresh state of the DPF is obtained;

[0050] Step three, according to the current running state of the engine, based on the carbon load model of the engine, the actual cumulative carbon load in the current regeneration cycle is obtained, and the differential pressure generated by the current carbon particles is obtained through the model relationship between carbon load and differential pressure;

[0051] Step four, the differential pressure generated by the current soot is obtained through steps one to three; based on the soot differential pressure model, the current soot amount is obtained;

[0052] Soot differential pressure = differential pressure sensor monitoring value - fresh DPF model differential pressure value - carbon particle model differential pressure value

[0053] Step five, compare the soot amount obtained by the differential pressure model with the set soot amount limit, if it exceeds the limit, trigger active regeneration;

[0054] Step six, after triggering active regeneration, run steps one to five again to confirm the soot amount obtained by the differential pressure model and obtain the current confirmed soot amount;

[0055] Step seven, at the same time, based on the running state of the engine, the fuel and oil consumption in the current soot cleaning mileage is obtained, and the soot amount generated by the actual fuel and oil consumption is obtained through the model relationship between fuel, oil consumption and soot amount;

[0056] Step eight, compare the larger value of the soot amounts obtained in steps six and seven with the soot amount limit, if it exceeds the soot amount limit, trigger a soot cleaning reminder;

[0057] Step nine, if the soot amount limit is not reached, return to monitoring.

[0058] ​Embodiment Two

[0059] Figure 2 is a structural schematic diagram of a diesel engine DPF ash cleaning control device in Embodiment Two of the present application. As shown in Figure 2 , Embodiment Two provides a diesel engine DPF ash cleaning control device, which comprises: a first acquisition module 201, a second acquisition module 202, a third acquisition module 203, a first calculation module 204, a first judgment module 205, and a first triggering module 206. The first acquisition module 201 is configured to acquire a DPF differential pressure according to a current engine operating state. The second acquisition module 202 is configured to acquire a differential pressure generated by ash and carbon particles according to the current engine operating state. The third acquisition module 203 is configured to acquire a differential pressure generated by ash according to the current engine operating state. The first calculation module 204 is configured to calculate a first ash accumulation amount according to the differential pressure generated by ash. The first judgment module 205 is configured to judge whether the first ash accumulation amount reaches an ash cleaning threshold. The first triggering module 206 is configured to trigger active regeneration if the ash cleaning threshold is reached.

[0060] In this embodiment, the diesel engine DPF ash cleaning control device further comprises: a fourth acquisition module 207, a second calculation module 208, a third calculation module 209, a second judgment module 210, and a second triggering module 211. The fourth acquisition module 207 is configured to acquire fuel and oil consumption within a current ash cleaning mileage according to the current engine operating state. The second calculation module 208 is configured to calculate an ash amount generated by actual fuel and oil consumption according to a fuel and oil consumption and ash accumulation amount model relationship. The third calculation module 209 is configured to calculate a second ash accumulation amount based on the first ash accumulation amount and the ash amount. The second judgment module 210 is configured to judge whether the second ash accumulation amount reaches the ash cleaning threshold. The second triggering module 211 is configured to trigger an ash cleaning reminder if the ash cleaning threshold is reached.

[0061] The various modes of variation and specific examples of the diesel engine DPF ash cleaning control method provided by Embodiment One are also applicable to the diesel engine DPF ash cleaning control device provided by this embodiment. Through the foregoing detailed description of the diesel engine DPF ash cleaning control method, those skilled in the art can clearly understand the implementation of the diesel engine DPF ash cleaning control device in this embodiment. Therefore, for the sake of brevity of the specification, the diesel engine DPF ash cleaning control device in this embodiment will not be described in detail.

[0062] Embodiment Three

[0063] Figure 3 is a structural schematic diagram of an electronic device in Embodiment Three of the present application. As shown in Figure 3 , Embodiment Three further provides an electronic device 300, which can comprise: a processor 301 and a memory 302.

[0064] The memory 302 is configured to store programs. The memory 302 can include volatile memory, such as random-access memory (RAM), including static RAM (SRAM), Double Data Rate SDRAM (DDR SDRAM), and the like. The memory 302 can also include non-volatile memory, such as flash memory. The memory 302 is configured to store computer programs (such as application programs, functional modules, and the like for implementing the above-described methods), computer instructions, and the like. The computer programs, computer instructions, and the like described above can be stored in one or more memories 302 in a partitioned manner. Furthermore, the computer programs, computer instructions, and the like described above can be invoked by the processor 301.

[0065] The computer programs, computer instructions, and the like described above can be stored in one or more memories 302 in a partitioned manner. Furthermore, the computer programs, computer instructions, and the like described above can be invoked by the processor 301.

[0066] The processor 301 is configured to execute the computer programs stored in the memory 302 to implement each step in the methods described above.

[0067] For details, refer to the related descriptions in the foregoing method embodiments.

[0068] The processor 301 and the memory 302 can be independent structures or integrated structures. When the processor 301 and the memory 302 are independent structures, the memory 302 and the processor 301 can be coupled and connected through the bus 303.

[0069] The electronic device of the embodiment can execute the technical solutions in the above-described methods, and the specific implementation process and technical principles are the same, which will not be described herein.

[0070] Embodiment Four

[0071] Embodiment Four also provides a computer-readable storage medium including computer programs and instructions, which, when executed on a computer, cause the computer to execute the control method for diesel engine DPF ash removal according to any of the embodiments of the present application.

[0072] The computer readable storage medium includes a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media capable of storing program codes.

[0073] The embodiment further provides a computer program product, which comprises a computer program stored in a readable storage medium, at least one processor of an electronic device can read the computer program from the readable storage medium, and the at least one processor executes the computer program to enable the electronic device to execute the scheme provided in any one of the above embodiments.

[0074] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present disclosure can be executed in parallel, sequentially or in a different order,

[0075] As long as the desired results of the technical scheme of the present disclosure can be achieved, the present disclosure is not limited herein.

[0076] In summary, the control method and device for diesel engine DPF ash removal of the present application, based on the original laboratory-based experience model, calculates the ash accumulation amount through oil and fuel consumption to trigger the ash removal reminder, and increases the differential pressure model based on the comparison of the ash accumulation amount determined based on the oil and fuel consumption models, and the ash removal reminder strategy of the larger value of the two, which well adapts to the complex use environment and ensures that the aftertreatment and engine can exert its best performance of high efficiency, low fuel consumption and low emission.

[0077] The foregoing description of specific exemplary embodiments of the application is intended to be illustrative only and is not intended to limit the application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the present application. The exemplary embodiments are chosen and described in order to explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application. It is intended that the scope of the application be defined by the claims appended hereto and their equivalents.

Claims

1. A control method of diesel particulate filter (DPF) ashing, characterized by, The method comprises the following steps: Step S100, acquiring the differential pressure of the DPF according to the current operating state of the engine, including the engine speed, the throttle, the exhaust flow, and the differential pressure sensor after the DPF aftertreatment; Step S200, acquiring the differential pressure of the fresh DPF according to the current operating state of the engine based on the model of the fresh DPF of the engine; Step S300, acquiring the actual accumulated carbon load in the current regeneration cycle based on the carbon load model of the engine according to the current operating state of the engine, and acquiring the differential pressure generated by the current carbon particles through the model relationship between the carbon load and the differential pressure; Step S400, calculating the differential pressure generated by the ash based on the step S100, the step S200 and the step S300, wherein the ash differential pressure is equal to the monitoring value of the differential pressure sensor minus the differential pressure value of the fresh DPF model minus the differential pressure value of the carbon particle model, and the first ash accumulation amount is calculated according to the ash differential pressure model; Step S500, judging whether the first ash accumulation amount reaches the ash cleaning threshold value; Step S600, if the first ash accumulation amount reaches the ash cleaning threshold value, triggering the active regeneration; Step S700, after triggering the active regeneration, executing the step S100 to the step S500 again to confirm the ash accumulation amount acquired by the differential pressure model and acquiring the confirmed first ash accumulation amount; Step S800, acquiring the fuel and oil consumption in the current ash cleaning mileage according to the current operating state of the engine; Step S900, calculating the ash amount generated by the actual fuel and oil consumption according to the model relationship between the fuel and oil consumption and the ash accumulation amount; Step S1000, comparing the confirmed first ash accumulation amount acquired in the step S700 with the ash amount acquired in the step S900, and taking the larger value as the second ash accumulation amount; Step S1100, judging whether the second ash accumulation amount reaches the ash cleaning threshold value; Step S1200, if the second ash accumulation amount reaches the ash cleaning threshold value, triggering the ash cleaning reminder.

2. A control device for DPF ash cleaning of a diesel engine, characterized in that The method comprises the following steps: A first acquisition module is configured to acquire the differential pressure of the DPF according to the current operating state of the engine, including the engine speed, the throttle, the exhaust flow, and the differential pressure sensor after the DPF aftertreatment; A second acquisition module is configured to acquire the differential pressure of the fresh DPF according to the current operating state of the engine based on the model of the fresh DPF of the engine; A third acquisition module is configured to acquire the actual accumulated carbon load in the current regeneration cycle based on the carbon load model of the engine according to the current operating state of the engine, and acquire the differential pressure generated by the current carbon particles through the model relationship between the carbon load and the differential pressure; A first calculation module is configured to calculate the differential pressure generated by the ash based on the DPF differential pressure, the differential pressure of the fresh DPF and the differential pressure generated by the current carbon particles, wherein the ash differential pressure is equal to the monitoring value of the differential pressure sensor minus the differential pressure value of the fresh DPF model minus the differential pressure value of the carbon particle model, and the first ash accumulation amount is calculated according to the ash differential pressure model; A first judgment module is configured to judge whether the first ash accumulation amount reaches the ash cleaning threshold value; A first trigger module is configured to trigger the active regeneration if the first ash accumulation amount reaches the ash cleaning threshold value. A fourth obtaining module is configured to, after triggering active regeneration, execute the first obtaining module to the first judging module again to obtain the confirmed first soot amount by confirming the soot amount obtained by the differential pressure model; A fifth obtaining module is configured to obtain the fuel and oil consumption within the current soot cleaning mileage according to the current engine operating state; A second calculating module is configured to calculate the soot amount generated by the actual fuel and oil consumption according to the relationship between the fuel and oil consumption and the soot amount model; A third calculating module is configured to compare the confirmed first soot amount obtained by the fourth obtaining module and the soot amount obtained by the second calculating module, and take the larger value as the second soot amount; A second judging module is configured to judge whether the second soot amount reaches the soot cleaning threshold; and A second triggering module is configured to trigger soot cleaning reminding if the second soot amount reaches the soot cleaning threshold.

3. An electronic device, comprising: It comprises: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the control method for diesel engine DPF soot cleaning according to claim 1.

4. A computer-readable storage medium, characterized in that, It comprises computer programs and instructions, when the computer programs or the instructions run on the computer, so that the computer executes the control method for diesel engine DPF soot cleaning according to claim 1.

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