A monitoring method and system for frequent regeneration of a particulate filter in a light diesel engine

Abstract

The present invention discloses a monitoring method and system for frequent regeneration of a particulate trap of a light-duty diesel engine. The method includes: calculating the maximum model carbon accumulation amount within a regeneration cycle according to the engine speed, fuel quantity, and EGR valve opening; calculating the increased value of the model carbon accumulation amount within the regeneration cycle according to the carbon accumulation amount at the end of the last regeneration and the maximum model carbon accumulation amount within the regeneration cycle; obtaining the corrected increased value of the model carbon accumulation amount according to the increased value of the model carbon accumulation amount within the regeneration cycle; calculating the increased value of the actual carbon accumulation amount within the regeneration cycle according to the current actual carbon accumulation amount; and judging whether the diesel particulate filter (DPF) has frequent regeneration according to the corrected increased value of the model carbon accumulation amount and the increased value of the actual carbon accumulation amount within the regeneration cycle. The present invention can complete the diagnosis of frequent regeneration within one DPF regeneration cycle, with a short diagnosis cycle and high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and more specifically, to a method and system for monitoring frequent regeneration of a particulate trap for a light diesel engine. Background Art

[0002] For the PM particulate matter emissions of the National VI diesel engines, the main off-board purification technology currently adopted is the diesel particulate filter (DPF). The DPF consists of a filter body for trapping PM and a regeneration system for periodically burning PM. The DPF is a semi-closed solid particulate trap. One end of each gas channel is open and the other end is closed. The same ends of adjacent two gas channels are alternately open and closed. The exhaust gas flows through the tiny gaps between adjacent airways. The gap diameter between adjacent airways is very small, which can effectively filter PM particles with relatively large diameters. The filtration efficiency of the wall-flow DPF, which is widely used now, can reach more than 90%. When the PM accumulates to a certain extent, the DPF regeneration system is triggered, and the PM trapped in the DPF is burned at a high temperature to generate CO2. The PM is trapped cyclically, causing the DPF to regenerate frequently.

[0003] OBD monitoring requirements for the DPF system:

[0004] "Limits and Measurement Methods for Emissions from Light-Duty Vehicles (China Phase VI)" (GB18352.6-2016) requires that the DPF system needs to monitor the DPF regeneration frequency: before the regeneration frequency of the particulate trap is higher than the regeneration frequency specified by the vehicle manufacturer and causes the actual emissions of the vehicle to exceed the OBD threshold, the OBD system should detect the corresponding fault. The present invention introduces a strategy for monitoring the DPF regeneration frequency. When the DPF regeneration frequency is abnormal, the fault is diagnosed in a timely manner to remind the driver to handle it.

[0005] Technical solutions of the prior art:

[0006] In the prior art, the diagnosis strategy for frequent regeneration of the particulate trap is to judge the number of DPF regenerations within a certain driving mileage of the vehicle or within a certain operating time period of the engine. If the number of DPF regenerations within the cycle period is greater than the limit value, a fault code is reported. Otherwise, it is diagnosed that there is no fault in the frequent regeneration of the DPF.

[0007] Disadvantages of the prior art:

[0008] 1. The diagnosis period is long. The regeneration mileage of a light diesel engine is 200 - 400 km, and the mileage period for judging frequent DPF regeneration is generally set to be more than 800 km. That is, if there is a fault in the frequent regeneration of the DPF, the fault code needs to be reported until the set cycle mileage is reached, which affects the performance, emissions and service life of the DPF;

[0009] 2. The DPF regeneration mileage is greatly affected by environmental temperature, altitude, and air quality. Judging whether there is frequent regeneration of the DPF solely based on the number of regenerations within a cycle has a certain risk of false alarms or missed alarms.

[0010] 3. After frequent regeneration error reporting, it is difficult to cure. The cure is the same as the error reporting, and it will be diagnosed and cured only once when the set cycle mileage is reached. According to regulatory requirements, after the DPF frequent regeneration error reporting lights up the fault lamp, it needs to reach the cycle mileage 3 times and detect no faults to extinguish the fault lamp. That is, after the error reporting, if the hardware is repaired and the fault code is not cleared through an external diagnostic tool, the ECU needs to travel at least 2400 km to extinguish the fault lamp.

[0011] Therefore, how to provide a monitoring method and system for frequent regeneration of a light-duty diesel engine particulate trap has become a technical problem urgently to be solved in this field. Summary of the Invention

[0012] The object of the present invention is to provide a monitoring method and system for frequent regeneration of a light-duty diesel engine particulate trap.

[0013] The first aspect of the present invention discloses a monitoring method for frequent regeneration of a light-duty diesel engine particulate trap; the method includes:

[0014] Step S1: Calculate the maximum model carbon accumulation amount within the regeneration cycle according to the engine speed, fuel quantity, and EGR valve opening.

[0015] Step S2: Calculate the increased value of the model carbon accumulation amount within the regeneration cycle according to the carbon accumulation amount at the end of the last regeneration and the maximum model carbon accumulation amount within the regeneration cycle.

[0016] Step S3: Obtain the corrected increased value of the model carbon accumulation amount according to the increased value of the model carbon accumulation amount within the regeneration cycle.

[0017] Step S4: Calculate the increased value of the actual carbon accumulation amount within the regeneration cycle according to the current actual carbon accumulation amount.

[0018] Step S5: Judge whether there is frequent regeneration of the particulate trap DPF according to the corrected increased value of the model carbon accumulation amount and the increased value of the actual carbon accumulation amount within the regeneration cycle.

[0019] According to the method of the first aspect of the present invention, in the step S1, the method for calculating the maximum model carbon accumulation amount within the regeneration cycle according to the engine speed, fuel quantity, and EGR valve opening includes:

[0020] Calculate the maximum PM mass flow dmSot1 in the EGR valve closed state according to the engine speed and fuel quantity.

[0021] Calculate the additional PM mass flow dmSot2 generated due to the opening of the EGR valve at different EGR valve openings.

[0022] Add the maximum PM mass flow rate dmSot1 and the additionally generated PM mass flow rate dmSot2 to obtain the maximum model PM mass flow rate dmSot under the current working condition, i.e., dmSot = dmSot1 + dmSot2;

[0023] Integrate the maximum model PM mass flow rate dmSot under the current working condition to obtain the maximum model carbon accumulation amount mSotSim during the regeneration period.

[0024] According to the method of the first aspect of the present invention, in the step S2, the method for calculating the increase value of the model carbon accumulation amount during the regeneration period based on the carbon accumulation amount at the end of the last regeneration and the maximum model carbon accumulation amount during the regeneration period includes:

[0025] Record the carbon accumulation amount mSot at the end of the last regeneration start ;

[0026] Subtract the carbon accumulation amount mSot at the end of the last regeneration from the maximum model carbon accumulation amount mSotSim during the regeneration period start , to obtain the increase value mSotSimDif of the model carbon accumulation amount during the regeneration period, i.e., mSotSimDif = mSotSim - mSot start .

[0027] According to the method of the first aspect of the present invention, in the step S3, the method for obtaining the corrected increase value of the model carbon accumulation amount based on the increase value of the model carbon accumulation amount during the regeneration period includes:

[0028] Calculate the correction value mSot of the model carbon accumulation amount for different ash masses by multiplying the ash mass by the deterioration coefficient cor ;

[0029] Add the increase value mSotSimDif of the model carbon accumulation amount during the regeneration period and the correction value mSot cor , to obtain the corrected increase value mSotSimDifMax of the model carbon accumulation amount, i.e.,

[0030] mSotSimDifMax = mSotSimDif + mSot cor .

[0031] According to the method of the first aspect of the present invention, in the step S4, the method for calculating the increase value of the actual carbon accumulation amount during the regeneration period based on the current actual carbon accumulation amount includes:

[0032] Subtract the carbon accumulation amount mSot at the end of the last regeneration from the current actual carbon accumulation amount mSot start , to obtain the increase value mSotDif of the actual carbon accumulation amount during the regeneration period.

[0033] According to the method of the first aspect of the present invention, in the step S5, the method for judging whether the diesel particulate filter (DPF) has frequent regeneration according to the increased carbon accumulation value of the correction model and the actual increased carbon accumulation value within the regeneration period includes:

[0034] If the increased carbon accumulation value mSotSimDifMax of the correction model is greater than a preset carbon accumulation limit value and regeneration is not triggered, it is determined that the diesel particulate filter (DPF) does not have frequent regeneration.

[0035] According to the method of the first aspect of the present invention, in the step S5, the method for judging whether the diesel particulate filter (DPF) has frequent regeneration according to the increased carbon accumulation value of the correction model and the actual increased carbon accumulation value within the regeneration period further includes:

[0036] Within a preset time after the diesel particulate filter (DPF) triggers regeneration, if the actual increased carbon accumulation value mSotDif within the regeneration period is greater than the increased carbon accumulation value mSotSimDifMax of the correction model, it is determined that the diesel particulate filter (DPF) has frequent regeneration.

[0037] The second aspect of the present invention discloses a monitoring system for frequent regeneration of a diesel particulate filter in a light-duty diesel engine; the system includes:

[0038] A first processing module configured to calculate the maximum model carbon accumulation within the regeneration period according to the engine speed, fuel quantity, and EGR valve opening;

[0039] A second processing module configured to calculate the increased model carbon accumulation value within the regeneration period according to the carbon accumulation at the end of the last regeneration and the maximum model carbon accumulation within the regeneration period;

[0040] A third processing module configured to obtain the increased carbon accumulation value of the correction model according to the increased model carbon accumulation value within the regeneration period;

[0041] A fourth processing module configured to calculate the actual increased carbon accumulation value within the regeneration period according to the current actual carbon accumulation;

[0042] A fifth processing module configured to judge whether the diesel particulate filter (DPF) has frequent regeneration according to the increased carbon accumulation value of the correction model and the actual increased carbon accumulation value within the regeneration period.

[0043] The third aspect of the present invention discloses an electronic device. The electronic device includes a memory and a processor. When the processor executes a computer program, the steps in any one of the monitoring methods for frequent regeneration of a diesel particulate filter in a light-duty diesel engine according to the first aspect of the present disclosure are implemented.

[0044] The fourth aspect of the present invention discloses a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, the steps in a monitoring method for frequent regeneration of a light diesel particulate filter according to any one of the first aspects of the present disclosure are implemented.

[0045] According to the technical content disclosed by the present invention, the following beneficial effects are achieved:

[0046] 1. The diagnostic cycle for frequent DPF regeneration is shortened, and an error is reported in a timely manner when a fault occurs to remind the driver to handle it.

[0047] 2. The diagnostic reliability is higher. The accumulated carbon amount is calculated in combination with the engine operating condition calculation model, covering all operating conditions of the engine, and reducing the failure to report or false reporting of frequent regeneration faults caused by changes in the regeneration mileage due to external factors such as ambient temperature and atmospheric pressure.

[0048] Through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0050] Figure 1 FIG. is a flowchart of a monitoring method for frequent regeneration of a light diesel particulate filter provided according to an embodiment;

[0051] Figure 2 FIG. is a structural diagram of a monitoring system for frequent regeneration of a light diesel particulate filter according to an embodiment of the present invention;

[0052] Figure 3 FIG. is a structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0054] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way limits the present invention or its application or use.

[0055] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification.

[0056] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0057] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

[0058] The present invention determines that frequent DPF regeneration needs to meet certain conditions, namely release conditions:

[0059] 1) There is no fault affecting the DPF system to ensure the normal working state of the DPF system;

[0060] 2) The DPF system is in a non-regenerative state;

[0061] 3) The previous DPF regeneration was successful, and the accumulated carbon amount in the DPF at the end of regeneration is small enough to empty the accumulated carbon amount in the DPF, ensuring the robustness of the frequent DPF regeneration diagnosis cycle.

[0062] Example 1:

[0063] The present invention discloses a method for monitoring frequent regeneration of a particulate filter in a light diesel engine. Figure 1 As a flowchart of a method for monitoring frequent regeneration of a particulate filter in a light diesel engine according to an embodiment of the present invention, as Figure 1 shown, the method includes:

[0064] Step S1, calculate the maximum model accumulated carbon amount during the regeneration cycle according to the engine speed, fuel quantity, and EGR valve opening;

[0065] Step S2, calculate the increase in the model accumulated carbon amount during the regeneration cycle according to the accumulated carbon amount at the end of the last regeneration and the maximum model accumulated carbon amount during the regeneration cycle;

[0066] Step S3, obtain the corrected increase in the model accumulated carbon amount according to the increase in the model accumulated carbon amount during the regeneration cycle;

[0067] Step S4, calculate the increase in the actual accumulated carbon amount during the regeneration cycle according to the current actual accumulated carbon amount;

[0068] Step S5, determine whether there is frequent regeneration of the particulate filter DPF according to the corrected increase in the model accumulated carbon amount and the increase in the actual accumulated carbon amount during the regeneration cycle.

[0069] In step S1, calculate the maximum model accumulated carbon amount during the regeneration cycle according to the engine speed, fuel quantity, and EGR valve opening.

[0070] In some embodiments, in the step S1, the method for calculating the maximum model carbon accumulation amount during the regeneration period according to the engine speed, fuel quantity, and EGR valve opening includes:

[0071] Calculate the maximum PM mass flow rate dmSot1 in the EGR valve closed state according to the engine speed and fuel quantity;

[0072] Calculate the additional PM mass flow rate dmSot2 generated due to the opening of the EGR valve at different EGR valve openings;

[0073] Add the maximum PM mass flow rate dmSot1 and the additional PM mass flow rate dmSot2 to obtain the maximum model PM mass flow rate dmSot under the current working condition, that is, dmSot = dmSot1 + dmSot2;

[0074] Integrate the maximum model PM mass flow rate dmSot under the current working condition to obtain the maximum model carbon accumulation amount mSotSim during the regeneration period.

[0075] In step S2, calculate the increase value of the model carbon accumulation amount during the regeneration period according to the carbon accumulation amount at the end of the last regeneration and the maximum model carbon accumulation amount during the regeneration period.

[0076] In some embodiments, in the step S2, the method for calculating the increase value of the model carbon accumulation amount during the regeneration period according to the carbon accumulation amount at the end of the last regeneration and the maximum model carbon accumulation amount during the regeneration period includes:

[0077] Record the carbon accumulation amount mSot at the end of the last regeneration start ;

[0078] Subtract the carbon accumulation amount mSot at the end of the last regeneration from the maximum model carbon accumulation amount mSotSim during the regeneration period start , to obtain the increase value mSotSimDif of the model carbon accumulation amount during the regeneration period, that is, mSotSimDif = mSotSim - mSot start .

[0079] In step S3, obtain the corrected increase value of the model carbon accumulation amount according to the increase value of the model carbon accumulation amount during the regeneration period.

[0080] In some embodiments, in the step S3, the method for obtaining the corrected increase value of the model carbon accumulation amount according to the increase value of the model carbon accumulation amount during the regeneration period includes:

[0081] Calculate the correction value mSot of the model carbon accumulation amount for different ash masses by multiplying the ash mass by the deterioration coefficient cor ;

[0082] During DPF regeneration, some ash cannot be burned and remains in the DPF. The ash will affect the DPF trapping efficiency. The greater the ash mass, the lower the DPF trapping efficiency. Add the increase value mSotSimDif of the model carbon accumulation during the regeneration period and the correction value mSot cor to obtain the increased value mSotSimDifMax of the corrected model carbon accumulation, that is

[0083] mSotSimDifMax = mSotSimDif + mSot cor .

[0084] In step S4, calculate the increased value of the actual carbon accumulation during the regeneration period according to the current actual carbon accumulation.

[0085] In some embodiments, in the step S4, the method for calculating the increased value of the actual carbon accumulation during the regeneration period according to the current actual carbon accumulation includes:[[]]

[0086] Subtract the carbon accumulation mSot at the end of the last regeneration from the current actual carbon accumulation mSot start to obtain the increased value mSotDif of the actual carbon accumulation during the regeneration period.

[0087] In step S5, determine whether the particulate filter DPF has frequent regeneration according to the increased value of the corrected model carbon accumulation and the increased value of the actual carbon accumulation during the regeneration period.

[0088] In some embodiments, in the step S5, the method for determining whether the particulate filter DPF has frequent regeneration according to the increased value of the corrected model carbon accumulation and the increased value of the actual carbon accumulation during the regeneration period includes:[[]]

[0089] The increased value mSotSimDifMax of the corrected model carbon accumulation is greater than the preset carbon accumulation limit value and regeneration is not triggered, indicating that the actual carbon accumulation is less at this time, and it is determined that the particulate filter DPF has no frequent regeneration.

[0090] Within the preset time when the particulate filter DPF triggers regeneration, if the increased value mSotDif of the actual carbon accumulation during the regeneration period is greater than the increased value mSotSimDifMax of the corrected model carbon accumulation, it is determined that the particulate filter DPF has frequent regeneration, a fault code is reported, and the fault indicator light is lit.

[0091] The present invention determines whether the DPF has frequent regeneration by comparing the carbon accumulation amount in the model with the actual carbon accumulation amount, solving the problems of long diagnostic cycle and low reliability in the existing monitoring strategy. By establishing the carbon accumulation amount in the DPF model and comparing the model carbon accumulation amount with the actual carbon accumulation amount, it is determined whether the DPF has frequent regeneration. In the prior art, the diagnosis strategy for frequent regeneration of the particulate trap is to judge the number of DPF regenerations during a certain driving mileage of the vehicle or a certain engine operation time period. If the number of DPF regenerations within the cycle period is greater than the limit value, a fault code is reported. Otherwise, it is diagnosed that there is no fault in the frequent regeneration of the DPF. The present invention compares the maximum model carbon accumulation amount with the actual carbon accumulation amount, and determines whether the DPF has frequent regeneration according to the comparison result. The model carbon accumulation amount is calculated according to the engine operating conditions. The maximum model carbon accumulation amount is compared with the actual carbon accumulation amount. If the maximum model carbon accumulation amount is greater than the actual carbon accumulation amount, it is determined that the DPF has no frequent regeneration. Otherwise, if the actual carbon accumulation amount is greater than the maximum model carbon accumulation amount, it is determined that the DPF has frequent regeneration.

[0092] In summary, the present invention proposes a monitoring method for frequent regeneration of a particulate trap in a light diesel engine, which can:

[0093] 1. Shorten the diagnostic cycle for frequent DPF regeneration, and report an error in a timely manner when a fault occurs to remind the driver to handle it;

[0094] 2. Have higher diagnostic reliability. By calculating the model carbon accumulation amount in combination with the engine operating conditions, it covers all operating conditions of the engine, reducing the non-reporting or false reporting of frequent regeneration faults caused by changes in regeneration mileage due to external factors such as ambient temperature and atmospheric pressure.

[0095] Embodiment 2:

[0096] The present invention discloses a monitoring system for frequent regeneration of a particulate trap in a light diesel engine. Figure 2 FIG. is a structural diagram of a monitoring system for frequent regeneration of a particulate trap in a light diesel engine according to an embodiment of the present invention; as Figure 2 shown, the system 100 includes:

[0097] A first processing module 101, configured to calculate the maximum model carbon accumulation amount during the regeneration period according to the engine speed, fuel quantity, and EGR valve opening;

[0098] A second processing module 102, configured to calculate the increase in the model carbon accumulation amount during the regeneration period according to the carbon accumulation amount at the end of the last regeneration and the maximum model carbon accumulation amount during the regeneration period;

[0099] A third processing module 103, configured to obtain a corrected increase in the model carbon accumulation amount according to the increase in the model carbon accumulation amount during the regeneration period;

[0100] The fourth processing module 104 is configured to calculate the actual carbon accumulation increase value during the regeneration period according to the current actual carbon accumulation amount.

[0101] The fifth processing module 105 is configured to determine whether the diesel particulate filter (DPF) has frequent regeneration according to the carbon accumulation increase value of the correction model and the actual carbon accumulation increase value during the regeneration period.

[0102] According to the system of the second aspect of the present invention, the first processing module 101 is specifically configured that the method for calculating the maximum model carbon accumulation amount during the regeneration period according to the engine speed, fuel quantity, and EGR valve opening includes:

[0103] Calculate the maximum PM mass flow rate dmSot1 in the EGR valve closed state according to the engine speed and fuel quantity.

[0104] Calculate the additional PM mass flow rate dmSot2 generated due to the opening of the EGR valve at different EGR valve openings.

[0105] Add the maximum PM mass flow rate dmSot1 and the additional generated PM mass flow rate dmSot2 to obtain the maximum model PM mass flow rate dmSot under the current working condition, that is, dmSot = dmSot1 + dmSot2.

[0106] Integrate the maximum model PM mass flow rate dmSot under the current working condition to obtain the maximum model carbon accumulation amount mSotSim during the regeneration period.

[0107] According to the system of the second aspect of the present invention, the second processing module 102 is specifically configured that the method for calculating the model carbon accumulation increase value during the regeneration period according to the carbon accumulation amount at the end of the last regeneration and the maximum model carbon accumulation amount during the regeneration period includes:

[0108] Record the carbon accumulation amount mSot at the end of the last regeneration start ;

[0109] Subtract the carbon accumulation amount mSot at the end of the last regeneration from the maximum model carbon accumulation amount mSotSim during the regeneration period start , to obtain the model carbon accumulation increase value mSotSimDif during the regeneration period, that is, mSotSimDif = mSotSim - mSot start .

[0110] According to the system of the second aspect of the present invention, the third processing module 103 is specifically configured that the method for obtaining the carbon accumulation increase value of the correction model according to the model carbon accumulation increase value during the regeneration period includes:

[0111] Calculate the correction value mSot of different ash masses on the carbon accumulation amount of the model by multiplying the ash mass by the deterioration coefficient cor ;

[0112] During DPF regeneration, part of the ash cannot be burned and remains in the DPF. The ash will affect the DPF trapping efficiency. The larger the ash mass, the lower the DPF trapping efficiency. Add the increased value mSotSimDif of the carbon accumulation amount in the model during the regeneration cycle and the correction value mSot cor to obtain the increased value mSotSimDifMax of the corrected model carbon accumulation amount, that is

[0113] mSotSimDifMax = mSotSimDif + mSot cor .

[0114] For the system according to the second aspect of the present invention, the fourth processing module 104 is specifically configured that the method for calculating the increased value of the actual carbon accumulation amount during the regeneration cycle according to the current actual carbon accumulation amount includes:

[0115] Subtract the carbon accumulation amount mSot at the end of the last regeneration from the current actual carbon accumulation amount mSot start to obtain the increased value mSotDif of the actual carbon accumulation amount during the regeneration cycle.

[0116] For the system according to the second aspect of the present invention, the fifth processing module 105 is specifically configured that the method for judging whether the particulate trap DPF has frequent regeneration according to the increased value of the corrected model carbon accumulation amount and the increased value of the actual carbon accumulation amount during the regeneration cycle includes:

[0117] If the increased value mSotSimDifMax of the corrected model carbon accumulation amount is greater than the preset carbon accumulation limit value and regeneration is not triggered, it means that the actual carbon accumulation amount is less at this time, and it is determined that the particulate trap DPF has no frequent regeneration.

[0118] Within the preset time when the particulate trap DPF triggers regeneration, if the increased value mSotDif of the actual carbon accumulation amount during the regeneration cycle is greater than the increased value mSotSimDifMax of the corrected model carbon accumulation amount, it is determined that the particulate trap DPF has frequent regeneration, a fault code is reported, and the fault indicator light is lit.

[0119] Example 3:

[0120] The present invention discloses an electronic device. The electronic device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps in any one of the monitoring methods for frequent regeneration of a light diesel engine particulate trap in the disclosed embodiments of the present invention are implemented.

[0121] Figure 3The structure diagram of an electronic device according to an embodiment of the present invention is as follows Figure 3 As shown, the electronic device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the electronic device is used to communicate with an external terminal in a wired or wireless manner. The wireless manner can be implemented through WIFI, a carrier network, near-field communication (NFC), or other technologies. The display screen of the electronic device can be a liquid crystal display screen or an electronic ink display screen. The input device of the electronic device can be a touch layer covered on the display screen, or a button, a trackball, or a touchpad provided on the housing of the electronic device, or an external keyboard, a touchpad, or a mouse, etc.

[0122] Those skilled in the art can understand that Figure 3 the structure shown in is only the structure diagram of the part related to the technical solution of the present disclosure, and does not constitute a limitation on the electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine some components, or have a different component arrangement.

[0123] Embodiment 4:

[0124] The present invention discloses a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, the steps in any one of Embodiment 1 of the present invention for monitoring the frequent regeneration of a light diesel particulate trap are implemented.

[0125] Please note that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not conflict, it should be considered as falling within the scope described in this specification. The above embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

[0126] The embodiments of the subject matter and the functional operations described in this specification can be implemented in digital electronic circuitry, tangibly embodied computer software or firmware, computer hardware including the structures disclosed in this specification and their structural equivalents, or one or more combinations of them. Embodiments of the subject matter described in this specification can be implemented as one or more computer programs, i.e., one or more modules of computer program instructions encoded on a tangible non-transitory program carrier to be executed by, or to control the operation of, a data processing apparatus. Alternatively or additionally, the program instructions can be encoded on an artificially generated propagated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, generated to encode and transmit information to a suitable receiver apparatus for execution by the data processing apparatus. A computer storage medium may be a machine-readable storage device, a machine-readable storage substrate, a random or serial access memory device, or a combination of one or more of them.

[0127] The processes and logical flows described in this specification can be performed by one or more programmable computers executing one or more computer programs to perform the functions corresponding by operating on input data and generating output. The processes and logical flows can also be performed by, or the apparatus can be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit).

[0128] Computers suitable for executing a computer program include, by way of example, general and / or special purpose microprocessors, or any other type of central processing unit. Generally, a central processing unit will receive instructions and data from a read only memory and / or a random access memory. Basic components of a computer include a central processing unit for implementing or executing instructions and one or more memory devices for storing instructions and data. Generally, a computer will also include one or more mass storage devices for storing data, such as magnetic disks, magneto-optical disks, or optical disks, etc., or the computer will be operatively coupled to such mass storage devices to receive data from it, or to transfer data to it, or both. However, a computer need not have such devices. In addition, a computer may be embedded in another device, such as a mobile phone, a personal digital assistant (PDA), a mobile audio or video player, a game console, a global positioning system (GPS) receiver, or a portable storage device such as a universal serial bus (USB) flash drive, to name just a few.

[0129] Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and memory devices, such as semiconductor memory devices (e.g., EPROM, EEPROM, and flash memory devices), magnetic disks (e.g., internal hard disks or removable disks), magneto-optical disks, and CD-ROM and DVD-ROM disks. The processor and the memory may be supplemented by, or incorporated in, special purpose logic circuitry.

[0130] Although this specification contains many specific implementation details, these should not be construed as limiting the scope of any invention or the scope of what is claimed, but rather as mainly describing the features of specific embodiments of a particular invention. Certain features that are described in multiple embodiments in this specification may also be implemented in combination in a single embodiment. On the other hand, the various features described in a single embodiment may also be implemented separately in multiple embodiments or in any suitable sub-combination. Additionally, although features may operate in certain combinations as described above and even be claimed as such initially, one or more features from a claimed combination may in some cases be removed from that combination, and the claimed combination may be directed to a sub-combination or a variation of a sub-combination.

[0131] Similarly, although operations are depicted in the figures in a particular order, this should not be construed as requiring that the operations be performed in the particular order shown or sequentially, or that all illustrated operations be performed, to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Additionally, the separation of the various system modules and components in the above embodiments should not be construed as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

[0132] Thus, specific embodiments of the subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the acts recited in the claims may be performed in a different order and still achieve the desired result. Additionally, the processes depicted in the figures are not necessarily in the particular order or sequential order shown to achieve the desired result. In some implementations, multitasking and parallel processing may be advantageous.

[0133] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

[0134] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A monitoring method for frequent regeneration of a particulate trap in a light diesel engine, characterized in that, The method includes: Step S1: Calculate the maximum model carbon accumulation amount within the regeneration period based on the engine speed, fuel quantity, and EGR valve opening; Step S2: Calculate the increase in the model carbon accumulation amount within the regeneration period based on the carbon accumulation amount at the end of the previous regeneration and the maximum model carbon accumulation amount within the regeneration period; Step S3: Obtain the corrected model carbon accumulation amount increase based on the increase in the model carbon accumulation amount within the regeneration period; Step S4: Subtract the carbon accumulation amount at the end of the previous regeneration from the current actual carbon accumulation amount to obtain the actual carbon accumulation amount increase within the regeneration period; Step S5: Determine whether the diesel particulate filter (DPF) has frequent regeneration based on the corrected model carbon accumulation amount increase and the actual carbon accumulation amount increase within the regeneration period, including: If the corrected model carbon accumulation amount increase is greater than the preset carbon accumulation amount limit and regeneration is not triggered, it is determined that the DPF does not have frequent regeneration; If the actual carbon accumulation amount increase within the regeneration period is greater than the corrected model carbon accumulation amount increase within the preset time for the DPF to trigger regeneration, it is determined that the DPF has frequent regeneration.

2. The monitoring method for frequent regeneration of a particulate trap of a light diesel engine according to claim 1, wherein In the step S1, the method for calculating the maximum model carbon accumulation amount within the regeneration period based on the engine speed, fuel quantity, and EGR valve opening includes: Calculate the maximum PM mass flow rate dmSot1 in the EGR valve closed state based on the engine speed and fuel quantity; Calculate the additional PM mass flow rate dmSot2 generated due to the opening of the EGR valve at different EGR valve openings; Add the maximum PM mass flow rate dmSot1 and the additional PM mass flow rate dmSot2 to obtain the maximum model PM mass flow rate dmSot under the current working condition, i.e., dmSot = dmSot1 + dmSot2; Integrate the maximum model PM mass flow rate dmSot under the current working condition to obtain the maximum model carbon accumulation amount mSotSim within the regeneration period.

3. The monitoring method for frequent regeneration of a particulate trap of a light diesel engine according to claim 1, characterized in that, In the step S2, the method for calculating the increase in the model carbon accumulation amount within the regeneration period based on the carbon accumulation amount at the end of the previous regeneration and the maximum model carbon accumulation amount within the regeneration period includes: Record the cumulative carbon amount mSot at the end of the last playback start ; Subtract the carbon accumulation amount mSot at the end of the last regeneration from the maximum model carbon accumulation amount mSotSim within the regeneration cycle start , to obtain the increased value mSotSimDif of the model carbon accumulation amount within the regeneration cycle, that is, mSotSimDif = mSotSim - mSot start .

4. The monitoring method for frequent regeneration of a particulate trap of a light diesel engine according to claim 1, wherein In the step S3, the method for obtaining the corrected model carbon accumulation amount increase based on the increase in the model carbon accumulation amount within the regeneration period includes: Calculate the correction value mSot of different ash masses on the model carbon accumulation amount by multiplying the ash mass by the deterioration coefficient cor ; Add the increase value mSotSimDif of the model carbon accumulation amount within the regeneration cycle and the correction value mSot cor to obtain the increase value mSotSimDifMax of the corrected model carbon accumulation amount, that is mSotSimDifMax = mSotSimDif + mSot cor 。 5. A monitoring system for frequent regeneration of a particulate trap of a light diesel engine, characterized in that, The system includes: A first processing module configured to calculate the maximum model carbon accumulation amount within the regeneration period based on the engine speed, fuel quantity, and EGR valve opening; A second processing module configured to calculate the increase in the model carbon accumulation amount within the regeneration period based on the carbon accumulation amount at the end of the previous regeneration and the maximum model carbon accumulation amount within the regeneration period; A third processing module configured to obtain the corrected model carbon accumulation amount increase based on the increase in the model carbon accumulation amount within the regeneration period; A fourth processing module configured to subtract the carbon accumulation amount at the end of the previous regeneration from the current actual carbon accumulation amount to obtain the actual carbon accumulation amount increase within the regeneration period; A fifth processing module configured to determine whether the diesel particulate filter (DPF) has frequent regeneration based on the corrected model carbon accumulation amount increase and the actual carbon accumulation amount increase within the regeneration period, including: If the increased value of the carbon accumulation amount of the correction model is greater than the preset carbon accumulation amount limit value and regeneration is not triggered, it is determined that the diesel particulate filter (DPF) does not have frequent regeneration. If, within the preset time for triggering regeneration of the diesel particulate filter (DPF), the actually increased value of the carbon accumulation amount during the regeneration cycle is greater than the increased value of the carbon accumulation amount of the correction model, it is determined that the diesel particulate filter (DPF) has frequent regeneration.

6. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps in a method for monitoring frequent regeneration of a diesel particulate filter in a light-duty diesel engine according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium. When the computer program is executed by the processor, the steps in a method for monitoring frequent regeneration of a diesel particulate filter in a light-duty diesel engine according to any one of claims 1 to 4 are implemented.

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