Range extender diesel engine aftertreatment DPF regeneration calibration method and device, medium and product
By obtaining the universal pulse spectrum in the diesel engine and selecting the appropriate working condition point for DPF regeneration calibration, the problems of difficulty in controlling the DPF regeneration temperature and increasing fuel consumption are solved, and efficient DPF regeneration and engine performance improvement are achieved.
Patent Information
- Application Number
- CN202411707364.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-02-28
AI Technical Summary
The regeneration temperature control of DPF in existing diesel engines is difficult, resulting in carbon accumulation, blockage and engine performance degradation, and active regeneration technology increases fuel consumption and calibration workload.
By obtaining the engine's universal pulse spectrum, selecting the power generation power working condition point and the unusual working condition point as calibration working condition points, realizing the diesel engine's post-treatment DPF regeneration calibration, avoiding the use of in-cylinder after-injection technology, reducing fuel consumption and calibration workload.
It reduces the engine after-processing calibration workload, saves engine fuel consumption, avoids DPF blockage and damage, reduces the after-processing failure rate, and improves the regeneration efficiency of DPF.
Smart Images
Figure CN119533947A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicle system calibration, and in particular to a range extender diesel engine aftertreatment DPF regeneration calibration method, equipment, medium and product. Background Art
[0002] Application of extended-range generator sets: With the continuous maturity of battery technology and motor drive technology, vehicles driven by electricity are accelerating to the market. For construction machinery or commercial vehicles, the extended-range hybrid technology that uses electricity as power and fuel engines to supplement energy can not only solve the problem of continuous and uninterrupted operation, but also has good fuel-saving performance, which is the current development trend. The extended-range diesel generator set can select the power generation power to supplement the battery according to the SOC (State of Charge) value of the vehicle battery. For example, when the battery SOC is lower than 30%, the extended-range diesel generator set sets a 30kW power generation power to quickly charge the battery; when the battery SOC rises to 80%, the extended-range diesel generator set adjusts the power generation power to 20kW for charging; when the battery SOC rises to 90%, the extended-range diesel generator set adjusts the power generation power to 10kW for charging.
[0003] Diesel Particulate Filter (DPF) technology: The DPF can effectively reduce the emission of particulate matter. It first captures particulate matter in the exhaust gas, and then oxidizes the captured particles to regenerate the particulate filter. The so-called filter regeneration means that in long-term operation, the gradual increase of particulate matter in the DPF will cause the engine back pressure to increase, resulting in a decrease in engine performance. Therefore, it is necessary to regularly remove the deposited particulate matter to restore the filtering performance of the DPF and reduce the back pressure.
[0004] There are two methods of DPF regeneration: active regeneration and passive regeneration. Active regeneration refers to the use of external energy to increase the temperature inside the DPF so that the particles ignite and burn. Small-displacement diesel engines generally achieve active regeneration through in-cylinder post-injection technology. The fuel injector is sprayed after the piston is away from the top dead center. This part of the unburned diesel enters the oxidation catalyst (Dieseloxidation catalyst, DOC) with the exhaust gas to oxidize and release heat, increase the internal temperature of the DPF, and thus burn the carbon particles. The chemical reaction equation is C+O2=CO2. Passive regeneration refers to the reaction of NO2 in the exhaust gas with carbon soot, thereby achieving the purpose of reducing carbon soot in the DPF. The reaction chemical equation is 2C+2NO2=2CO2+N2.
[0005] Difficulties and disadvantages of particulate filter control: According to the above description, the difficulty of using DPF lies in the regeneration temperature control. Improper exhaust temperature will cause the carbon accumulated in the DPF to not be reacted. The carbon will accumulate more and more, clogging and damaging the DPF. The engine exhaust is compressed and the fuel consumption increases, and even the engine is damaged. At the same time, the active regeneration application of the cylinder post-injection technology increases the fuel consumption of the diesel engine. At present, the mainstream diesel engine post-treatment regeneration temperature calibration is to use two cylinder post-injection technology, delay the main injection advance angle and reduce the air intake volume, and reduce the common rail pressure to increase the temperature before the post-treatment DOC. At the same time, the fuel injected by the cylinder post-injection becomes hydrocarbons in the exhaust gas. The hydrocarbons enter the DOC and oxidize to produce a lot of heat, which eventually makes the DPF inlet temperature reach about 600℃. The high temperature causes the carbon in the DPF to burn and produce CO2. This method will increase the fuel consumption of the engine by adding two injections, and it involves many calibration factors (throttle control, main injection control, common rail pressure control, two injection angle control, two injection oil quantity control), and has the disadvantage of large calibration workload. Moreover, in actual application, the injector adds two injections, and the injection control accuracy is required to be high. Poor control of injection will also increase the possibility of DPF being damaged by heat. Summary of the invention
[0006] The above-mentioned problems existing in the prior art have not been solved. The present application provides a method, equipment, medium and product for regeneration calibration of a range extender diesel engine after-treatment DPF.
[0007] To achieve the above objectives, this application provides the following solutions:
[0008] In a first aspect, the present application provides a range extender diesel engine after-treatment DPF regeneration calibration method, the range extender diesel engine after-treatment DPF regeneration calibration method is applied to a structure in which the after-treatment scheme is a diesel engine oxidation catalyst and a diesel engine particulate filter; the range extender diesel engine after-treatment DPF regeneration calibration method comprises:
[0009] Determine the original exhaust condition of the engine; the original exhaust condition includes the original exhaust normal condition and the original exhaust abnormal condition;
[0010] Get the universal map of the engine;
[0011] Selecting an operating point based on the universal map of the engine and the original exhaust condition of the engine; the selected operating point includes: a power generation operating point and an unconventional operating point; the unconventional operating point refers to the rated power point of the engine;
[0012] The particulate filter regeneration calibration of the range extender diesel engine aftertreatment is completed based on the selected operating point.
[0013] Optionally, before obtaining the universal map of the engine, the following steps are included:
[0014] According to the engine speed and torque, collect the fuel consumption, exhaust temperature and power data at different speeds and torques;
[0015] A universal map of the engine is constructed based on the fuel consumption, the exhaust temperature data after the turbine and the power data at different speeds and different torques.
[0016] Optionally, when the original exhaust of the engine is normal, selecting the operating point based on the universal map of the engine and the original exhaust condition of the engine includes:
[0017] The point on the equal power curve corresponding to the minimum fuel consumption and the maximum post-turbine exhaust temperature in the universal map of the engine is taken as the power generation operating point.
[0018] Optionally, when the original exhaust of the engine is abnormal, selecting the operating point based on the universal map of the engine and the original exhaust condition of the engine includes:
[0019] The maximum power point of the equal power curve in the universal map of the engine is taken as the abnormal operating point.
[0020] Optionally, the range extender diesel engine aftertreatment DPF regeneration calibration method further includes:
[0021] By changing the main injection timing and rail pressure of the engine, the exhaust temperature after the turbine at the rated power condition of the engine is increased to a set temperature.
[0022] Optionally, the set temperature is at least 580°C.
[0023] Optionally, the rated power of the engine is between 19kW and 37kW.
[0024] In a second aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the above-described methods for calibrating the regeneration of a range extender diesel engine aftertreatment DPF.
[0025] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-mentioned methods for calibrating the regeneration of a range extender diesel engine aftertreatment DPF.
[0026] In a fourth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any of the above-mentioned methods for calibrating the regeneration of a range-extender diesel engine aftertreatment DPF.
[0027] According to the specific embodiments provided in this application, this application has the following technical effects:
[0028] The present application provides a range extender diesel engine post-processing DPF regeneration calibration method, equipment, medium and product, which can reduce the engine post-processing calibration workload by selecting power generation operating points and unconventional operating points as calibration operating points. In addition, by selecting operating points based on the universal map of the engine and the original exhaust conditions of the engine, the active regeneration and passive regeneration of the post-processing are the strongest, and the relevant regeneration is not performed using the in-cylinder post-injection technology. While reducing the engine post-processing calibration workload, it can also save engine fuel consumption, avoid blockage and damage to the DPF, and thus reduce the post-processing failure rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0030] Figure 1 A schematic diagram of a flow chart of a range extender diesel engine aftertreatment DPF regeneration calibration method provided in one embodiment of the present application;
[0031] Figure 2 A schematic diagram of the structure of a range-extended hybrid power system provided in one embodiment of the present application;
[0032] Figure 3 A universal map of an engine provided in one embodiment of the present application;
[0033] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION
[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0035] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0036] In an exemplary embodiment, for example Figure 2Taking the extended-range hybrid system structure shown as an example, a range extender diesel engine post-processing DPF regeneration calibration method is provided. In this extended-range hybrid system, the range extender is an energy replenishment device, the engine and generator controller communicate with the range extender controller through CAN communication, and the engine's exhaust gas treatment device is a diesel oxidation catalyst and a diesel particulate filter, which are installed in the engine supercharger exhaust pipe, as close to the supercharger outlet as possible to reduce exhaust heat loss. Based on this, the range extender diesel engine post-processing DPF regeneration calibration method is executed by a computer device, which can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the embodiment of the present application, the method is applied to a server as an example for explanation.
[0037] The calibration method for DPF regeneration in range extender diesel aftertreatment is applied to the architecture of diesel oxidation catalyst and diesel particulate filter as the aftertreatment scheme. That is, in this method, the DOC+DPF scheme is selected as the aftertreatment method. According to the passive regeneration chemical reaction equation 2C+2NO2=2CO2+N2, the concentration of NO2 in passive regeneration is critical, and the original nitrogen oxide composition of the engine is mainly NO. If DOC is installed in the aftertreatment, DOC can oxidize CO and NO in the exhaust gas into CO2 and NO2. NO2 will promote the passive regeneration of carbon in DPF. Increasing the NO2 concentration in the exhaust gas will enhance the passive regeneration ability of DPF. The capture rate of DPF for soot is above 90%. Based on this, if Figure 1 The range extender diesel engine aftertreatment DPF regeneration calibration method includes:
[0038] Step 100: Determine the original exhaust condition of the engine, which includes the original exhaust normal condition and the original exhaust abnormal condition.
[0039] Step 101: Obtain the universal map of the engine.
[0040] Step 102: Select an operating point based on the engine's universal map and the original exhaust conditions of the engine. The selected operating points include: power generation operating points and unconventional operating points. The unconventional operating points refer to the rated power points of the engine.
[0041] Step 103: completing the particulate filter regeneration calibration of the range extender diesel engine aftertreatment based on the selected operating point.
[0042] In an exemplary embodiment of the present application, the process of constructing the universal map of the engine obtained in the above step 101 can be described as follows:
[0043] (1) According to the engine speed and torque, collect the fuel consumption, exhaust temperature and power data at different speeds and torques.
[0044] (2) Based on the fuel consumption, exhaust temperature and power data at different speeds and torques, a universal map of the engine is constructed. Figure 3 As shown, Figure 3 The green dotted line in the middle represents the equal power curve of the engine, and the decibel includes equal power curves of 30kW, 25kW, 20kW, 15kW, and 10kW. Figure 3 The blue dotted line in the figure represents the engine's proportional fuel consumption curve. Figure 3 The red solid line in the figure represents the exhaust temperature curve after the turbine of the engine.
[0045] In an exemplary embodiment of the present application, the rated power P max At 19kW<P max Taking the range extender engine with power less than 37kW as an example, the process of selecting the operating point under the original exhaust conditions of different engines is explained.
[0046] (1) Under normal engine exhaust conditions, select the operating point based on the engine's universal map and the engine's exhaust conditions, including:
[0047] The point on the isopower curve corresponding to the minimum fuel consumption and the maximum exhaust temperature after the turbine in the engine's universal spectrum diagram is used as the power generation operating point. The advantage of selecting this point is that it can meet the power generation requirements while meeting the conditions of relatively low fuel consumption and relatively high exhaust temperature after the turbine, thereby making the active and passive capabilities of the post-treatment very high, so that the original exhaust particulate matter will quickly react to produce CO2 in the post-treatment, thereby preventing the carbon load in the DPF from increasing.
[0048] Among them, the main function of the range extender is to replenish the battery, and the commonly used power generation powers are 15kW, 20kW, 25kW and 30kW, etc. Figure 3 The five red circles in the figure represent the operating points (i.e., power operating points) selected by the range extender when the power generation is 30kW, 25kW, 20kW, 15kW, and 10kW respectively. For example, the operating condition selected for the power generation of 25kW is approximately 2500rpm / 95Nm. Figure 2 It can be seen that this point is the point with the lowest fuel consumption and the highest exhaust temperature before the turbine on the 25kW isopower line. Figure 2 In the figure, CANH indicates the port connected to a high level, and CANL indicates the port connected to a low level.
[0049] (2) When the original exhaust of the engine is abnormal, select the operating point based on the engine's universal map and the original exhaust conditions of the engine, including:
[0050] The maximum power point of the equal power curve in the engine's universal map is taken as the abnormal operating point.
[0051] Due to some other reasons (e.g., poor intake throttle control, poor fuel injection by the injector, etc.), the original exhaust particulate matter emission deteriorates and the original exhaust particulate matter exceeds the normal engine operating condition. At this time, the exhaust temperature after the turbine in the commonly used power generation condition is not enough, resulting in the active regeneration and passive regeneration capabilities being smaller than the original exhaust particle generation capabilities. Long-term operation will cause excessive accumulation of particulate matter in the DPF, blocking the DPF. Continuing to operate will damage the DPF or the engine. In order to cope with this special situation, the maximum power point of the equal power curve in the universal map of the engine is taken as an unconventional operating point, so as to increase the exhaust temperature after the turbine in the maximum power condition of the engine to the set temperature (e.g., 580°C) by changing the main injection timing and rail pressure of the engine. For example, if the DPF is detected to be slightly blocked, the range extender controller immediately runs the engine to the maximum power point. At this time, the exhaust temperature after the turbine of the engine reaches 580°C, which can increase the reaction rate of C+O2=CO2 in the particulate filter, improve the regeneration capacity, and prevent DPF from being blocked and damaged.
[0052] Based on the above description, in the range extender diesel engine after-treatment DPF regeneration calibration method provided by the present application, the power generation condition is selected according to the fuel consumption and exhaust temperature curve after the vortex in the universal spectrum diagram in combination with the power generation power of the range extender, and the minimum specific fuel consumption point in the fuel consumption circle of the equal power generation line is selected. At the same time, this fuel consumption point is calibrated under the condition of the highest temperature of the exhaust temperature circle after the vortex, which can make the active regeneration and passive regeneration of the after-treatment strongest. During the entire calibration process, the in-cylinder post-injection technology is not used for related regeneration, which can reduce the workload of engine after-treatment calibration, save engine fuel consumption, and reduce the failure rate of after-treatment.
[0053] In addition, combined with the above power generation power of 19kW<P max The application of engines between <37kW on range extenders can provide European engineering machinery with different conventional DPF regeneration solutions for converting emission levels from China non-IV to Euro non-V. Compared with the traditional small-displacement diesel engine through in-cylinder post-injection technology, the solution provided by this application can realize the active regeneration solution. In addition, this application combines the actual application conditions of the range extender and adopts the DOC+DPF post-treatment solution. By cleverly selecting the working conditions, it ensures that the exhaust temperature after the turbine is as high as possible, improves the active and passive regeneration efficiency of the post-treatment, and can complete the regeneration of the post-treatment without using the in-cylinder post-injection technology, thereby reducing the fuel consumption of the engine. The carbon inside the DPF reacts in time to generate CO2 and is discharged. The exhaust gas of the engine is compressed but not increased, and the corresponding engine fuel consumption will not deteriorate. At the same time, compared with the engine using in-cylinder post-injection technology, this application can increase the post-treatment temperature and reduce the calibration workload of the engine.
[0054] In another exemplary embodiment of the present application, in order to provide a computer device in an exemplary embodiment, the computer device may be a server or a terminal, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store the range extender diesel engine post-processing DPF regeneration calibration data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a range extender diesel engine post-processing DPF regeneration calibration method is implemented.
[0055] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.
[0056] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.
[0057] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.
[0058] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.
[0059] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).
[0060] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.
[0061] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0062] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.
Claims
1. A range extender diesel engine post-treatment DPF regeneration calibration method, characterized in that: The range extender diesel engine aftertreatment DPF regeneration calibration method is applied to a structure where the aftertreatment solution is a diesel oxidation catalyst and a diesel particulate filter; The range extender diesel engine aftertreatment DPF regeneration calibration method comprises: Determine the original exhaust condition of the engine; the original exhaust condition includes the original exhaust normal condition and the original exhaust abnormal condition; Get the universal map of the engine; Selecting an operating point based on the universal map of the engine and the original exhaust condition of the engine; the selected operating point includes: a power generation operating point and an unconventional operating point; the unconventional operating point refers to the rated power point of the engine; The particulate filter regeneration calibration of the range extender diesel engine aftertreatment is completed based on the selected operating point.
2. The range extender diesel engine post-treatment DPF regeneration calibration method according to claim 1, characterized in that: Before obtaining the engine's universal map, include: According to the engine speed and torque, collect the fuel consumption, exhaust temperature and power data at different speeds and torques; A universal map of the engine is constructed based on the fuel consumption, the exhaust temperature data after the turbine and the power data at different speeds and different torques.
3. The range extender diesel engine post-treatment DPF regeneration calibration method according to claim 1, characterized in that: When the original exhaust of the engine is normal, selecting an operating point based on a universal map of the engine and the original exhaust condition of the engine includes: The point on the equal power curve corresponding to the minimum fuel consumption and the maximum post-turbine exhaust temperature in the universal map of the engine is taken as the power generation operating point.
4. The range extender diesel engine post-treatment DPF regeneration calibration method according to claim 1, characterized in that: In the case of abnormal original exhaust of the engine, selecting an operating point based on a universal map of the engine and the original exhaust condition of the engine includes: The maximum power point of the equal power curve in the universal map of the engine is taken as the abnormal operating point.
5. The range extender diesel engine post-treatment DPF regeneration calibration method according to claim 1, characterized in that: The range extender diesel engine aftertreatment DPF regeneration calibration method further includes: By changing the main injection timing and rail pressure of the engine, the exhaust temperature after the turbine at the rated power condition of the engine is increased to a set temperature.
6. The range extender diesel engine post-treatment DPF regeneration calibration method according to claim 5, characterized in that: The set temperature is at least 580°C.
7. The range extender diesel engine post-treatment DPF regeneration calibration method according to claim 5, characterized in that: The rated power of the engine is between 19kW and 37kW.
8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the range extender diesel engine aftertreatment DPF regeneration calibration method according to any one of claims 1 to 7.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the range extender diesel engine aftertreatment DPF regeneration calibration method according to any one of claims 1 to 7 is implemented.
10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the range extender diesel engine aftertreatment DPF regeneration calibration method according to any one of claims 1 to 7 is implemented.