A method for controlling the regeneration temperature of an integrated oxidation trap and related equipment

Abstract

This invention discloses an integrated oxidation trap regeneration temperature control method and related equipment, relating to the field of vehicle aftertreatment technology. The method includes: dividing the DDPF (Dissolved Dioxide Powder) into blocks to obtain the outlet model temperature of each DDPF block; obtaining a feedforward fuel injection quantity based on the engine exhaust gas flow rate, the inlet model temperature of the DDPF block, and the desired outlet temperature; performing graded correction on the upstream temperature of the DDPF based on a first deviation between the desired outlet temperature and the outlet model temperature of the DDPF block, and a second deviation between the downstream model temperature and the measured downstream temperature of the DDPF, combined with the cumulative value of the second deviation, to obtain a feedback fuel injection quantity; and obtaining the engine target fuel injection quantity based on the feedforward and feedback fuel injection quantities for regeneration control. Multi-stage fuel quantity correction is performed according to temperature conditions to avoid temperature overshoot or undershoot during the regeneration process.

Description

Technical Field

[0001] This invention relates to the field of vehicle aftertreatment technology, and in particular to an integrated oxidation trap regeneration temperature control method and related equipment. Background Technology

[0002] Currently, traditional non-road Stage IV diesel engines use DOC (Diesel Oxide Catalyst) and DPF (Diesel Particulate Filter) technologies to address particulate emissions. The integrated oxidation filter DDPF is a technology that eliminates the DOC support and coats the catalyst onto the DPF, based on the principles of DOC and DPF.

[0003] When particulate matter accumulates to a certain level in the integrated oxidation trap and triggers regeneration, the particulate matter covers the catalyst surface and releases heat during oxidation, which inevitably affects the regeneration temperature control. In addition, when the regeneration temperature deviation is too large due to the inconsistency of diesel engine components, it is currently impossible to effectively compensate for steady-state errors. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes an integrated oxidation trap regeneration temperature control method and related equipment, which performs multi-stage oil quantity correction based on temperature conditions to avoid temperature overshoot or undershoot during the regeneration process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for controlling the regeneration temperature of an integrated oxidation trap, comprising: The DDPF is divided into blocks and temperature models are constructed to obtain the outlet model temperature of each DDPF block. The upstream temperature of the DDPF is used as the inlet temperature of the first DDPF block, the outlet model temperature of the previous DDPF block is used as the inlet model temperature of the next DDPF block, and the outlet model temperature of the last DDPF block is used as the downstream model temperature of the DDPF. The feedforward injection quantity is obtained based on the engine exhaust gas flow rate, the inlet model temperature of each DDPF block, and the expected outlet temperature. Based on the first deviation between the expected outlet temperature and the outlet model temperature of each DDPF block, the second deviation between the downstream model temperature and the measured downstream temperature of DDPF, and the graded correction of the upstream temperature of DDPF by combining the cumulative value of the second deviation, the feedback injection quantity is obtained. The target fuel injection quantity of the engine is obtained based on the feedforward fuel injection quantity and the feedback fuel injection quantity, and regenerative control is performed accordingly.

[0006] As an alternative implementation method, the temperature model is: ; in, The inlet model temperature for DDPF blocks. The outlet model temperature for DDPF segmentation. The wall temperature of the DDPF segment. For ambient temperature, For the specific heat capacity of the exhaust gas, Specific heat capacity of DDPF blocks The heat capacity of DDPF blocks for heat exchange with the environment. This refers to the exhaust mass flow rate. For the quality of DDPF blocks, Because it is a low-calorific-value fuel, The THC mass flow rate upstream of DDPF THC conversion efficiency for DDPF blocks.

[0007] As an alternative implementation, the process of obtaining the feedforward injection quantity includes: multiplying the deviation between the inlet model temperature and the desired outlet temperature of each DDPF block by the engine exhaust gas flow rate and the DDPF calibration conversion efficiency to obtain the feedforward injection quantity.

[0008] As an alternative implementation method, the process of obtaining the target fuel injection quantity for the engine includes: Based on the first deviation, the first feedback fuel injection quantity is obtained through proportional control; Based on the second deviation and combined with the cumulative value of the second deviation, the second feedback injection quantity is obtained through integral control. The target fuel injection quantity of the engine is obtained by adding the feedforward fuel injection quantity, the first feedback fuel injection quantity, and the second feedback fuel injection quantity.

[0009] As an alternative implementation method, the hierarchical correction process includes: When the cumulative second deviation between the downstream model temperature and the measured downstream temperature of DDPF is less than 0, a graded correction is performed according to the set negative correction temperature limit, and the DDPF conversion efficiency after each correction is calculated. The effectiveness of the correction is determined by the absolute value of the difference between the conversion efficiencies of two adjacent DDPF stages and the corrected conversion efficiencies of each stage, until the measured downstream temperature of the DDPF reaches the regeneration target temperature.

[0010] As an alternative implementation method, the hierarchical correction process specifically includes: During the initial correction, only the temperature is corrected, not the fuel injection quantity, and the first DDPF conversion efficiency is calculated. If the conversion efficiency of the first DDPF is greater than the set conversion threshold, then the first-level correction is activated to calculate the conversion efficiency of the second DDPF. If the absolute value of the difference between the first DDPF conversion efficiency and the second DDPF conversion efficiency is less than the set difference threshold, and both the first DDPF conversion efficiency and the second DDPF conversion efficiency are greater than the conversion threshold, then the second-level correction is enabled to calculate the third DDPF conversion efficiency. If the absolute value of the difference between the first DDPF conversion efficiency and the second DDPF conversion efficiency, and the absolute value of the difference between the second DDPF conversion efficiency and the third DDPF conversion efficiency are all less than the difference threshold, and the first DDPF conversion efficiency, the second DDPF conversion efficiency, and the third DDPF conversion efficiency are all greater than the conversion threshold, then it is determined that the temperature deviation is caused by the inaccurate fuel quantity of the injector, the third-level correction is activated, the fourth DDPF conversion efficiency is calculated, until the regeneration target temperature is reached; If the absolute value of the difference is greater than the difference threshold, or if the DDPF conversion efficiency is less than the conversion threshold, then the DDPF is determined to be a failure and regeneration is terminated.

[0011] Secondly, the present invention provides an integrated regeneration temperature control system for an oxidation trap, comprising: The modeling module is configured to divide DDPF into blocks and build temperature models to obtain the outlet model temperature of each DDPF block; wherein, the upstream temperature of DDPF is used as the inlet temperature of the first DDPF block, the outlet model temperature of the previous DDPF block is used as the inlet model temperature of the next DDPF block, and the outlet model temperature of the last DDPF block is used as the downstream model temperature of DDPF. The feedforward module is configured to obtain the feedforward injection quantity based on the engine exhaust gas flow rate, the inlet model temperature of each DDPF block, and the desired outlet temperature. The feedback module is configured to obtain the feedback injection quantity based on the first deviation between the expected outlet temperature and the outlet model temperature of each DDPF block, the second deviation between the downstream model temperature and the measured downstream temperature of DDPF, and the graded correction of the upstream temperature of DDPF by combining the cumulative value of the second deviation. The control module is configured to obtain the engine target injection quantity based on the feedforward injection quantity and the feedback injection quantity, and then perform regenerative control.

[0012] Thirdly, the present invention provides an electronic device including a memory and a processor, and computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, perform the method described in the first aspect.

[0013] Fourthly, the present invention provides a computer-readable storage medium for storing computer instructions, which, when executed by a processor, perform the method described in the first aspect.

[0014] Fifthly, the present invention provides a computer program product, including a computer program that, when executed by a processor, implements the method described in the first aspect.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Compared to traditional DPF regeneration, DDPF regeneration is less efficient due to particulate matter accumulation that coats precious metals, reducing the contact area between fuel and precious metals. This results in differences in regeneration temperature even with the same calibration data. Furthermore, the exothermic oxidation of particulate matter within the DDPF also affects regeneration temperature control. To compensate for these differences, this invention proposes an integrated oxidation trap regeneration temperature control method. The DDPF is divided into blocks, and the outlet model temperature of each block is calculated. Regeneration temperature control is then achieved through feedforward, an integrator, and a proportional controller. The integrator is controlled by an observer, which effectively compensates for steady-state errors. The observer can adjust the integrator in a timely manner, performing multi-stage fuel quantity corrections based on temperature conditions to avoid temperature overshoot or undershoot.

[0016] The method of this invention can also identify the cause of large regeneration temperature deviation. If the insufficient regeneration temperature is caused by inaccurate fuel injection, multi-stage fuel quantity correction can be performed through the observer. When the conversion efficiency deviation between each stage of fuel quantity correction is less than the set difference threshold and the conversion efficiency of each stage of DDPF can reach the set conversion threshold, it is proven that the fuel quantity correction is effective, and fuel quantity correction continues until the downstream temperature of DDPF reaches the regeneration target temperature. If the conversion efficiency of DDPF is low due to sulfur poisoning or other reasons, fuel quantity correction is not performed, regeneration is stopped, and a DDPF system failure is reported.

[0017] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a flowchart of the integrated oxidation trap regeneration temperature control method provided in Embodiment 1 of the present invention; Figure 2 A schematic diagram of DDPF; Figure 3 This is a schematic diagram of DDPF block division provided in Embodiment 1 of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. Furthermore, it should be understood that the terms “comprising” and “including”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0024] Terminology Explanation: (1) Oxidation-type catalytic converter (DOC): Installed before DPF, it is used to oxidize NO in the tail gas to NO2, while increasing the tail gas temperature and assisting the normal operation of DPF and SCR (Selective Catalytic Reduction).

[0025] DOC (Direct Oxidation Catalytic Converter) involves coating a honeycomb ceramic carrier with a precious metal catalyst (such as platinum (Pt)). Its purpose is to lower the activation energy of chemical reactions involving HC, CO, and SOF in engine exhaust, allowing these substances to undergo oxidation reactions with oxygen in the exhaust at lower temperatures, ultimately converting them into CO2 and H2O. Oxidation catalytic converters do not require regeneration systems or control devices, are simple in structure, highly reliable, and can be applied to modern small engines.

[0026] (2) Particulate Filter (DPF): Used to capture particulate matter in exhaust gas. When the mass of captured particulate matter reaches a certain level, passive or active regeneration is required to restore the DPF's ability to capture particulate matter.

[0027] DPF (Diffusion-Powered Filter) primarily filters and traps particulate matter in engine exhaust through diffusion, deposition, and impaction mechanisms. As exhaust flows through the filter, particulate matter is trapped within the filter element, leaving cleaner exhaust to be released into the atmosphere. Currently, wall-flow honeycomb ceramic filters are widely used, mainly in construction machinery and city buses. They are characterized by simple operation and high filtration efficiency, but suffer from issues such as filter regeneration and sensitivity to sulfur in fuel.

[0028] The basic working principle is as follows: When engine exhaust flows through the DOC (Diesel Oxide), under temperature conditions of 200-600℃, CO and HC are almost entirely oxidized into CO2 and H2O, while NO is converted into NO2. After the exhaust exits the DOC and enters the DPF (Diesel Particulate Filter), the particulates are captured in the filter element, and the remaining cleaner exhaust is discharged into the atmosphere. The DPF's capture efficiency can reach over 90%.

[0029] NO2 has a strong oxidizing ability on the captured particles. The generated NO2 is used as an oxidant to remove particles from the particulate trap and generate CO2. The NO2 is then reduced to NO, thereby achieving the purpose of removing particles.

[0030] DOC internal reaction principle: .

[0031] DPF internal reaction principle: .

[0032] There are two methods for filter regeneration: active regeneration and passive regeneration. Active regeneration refers to using external energy to raise the temperature inside the filter, causing the particles to ignite and burn. When the temperature inside the filter reaches 550°C, the deposited particles oxidize and burn. If the temperature does not reach 550°C, excessive deposits will clog the filter. In this case, it is necessary to use external energy (such as electric heaters, burners, or changes in engine operating conditions) to raise the temperature inside the DPF and oxidize and burn the particles.

[0033] Passive regeneration refers to the use of fuel additives or catalysts to lower the ignition temperature of particulate matter, allowing it to ignite and burn at normal engine exhaust temperatures. Additives (cerium, iron, and strontium) are added to the fuel in specific proportions. Too much additive has little effect, but too little can lead to delayed regeneration or increased regeneration temperature.

[0034] (3) Integrated oxidation trap DDPF: a catalyst with DOC formulation and DPF formulation coated in sections, taking into account the functions of both.

[0035] Example 1 This embodiment provides a method for controlling the regeneration temperature of an integrated oxidation trap, such as... Figure 1 As shown, it includes: The DDPF is divided into blocks and temperature models are constructed to obtain the outlet model temperature of each DDPF block. The upstream temperature of the DDPF is used as the inlet temperature of the first DDPF block, the outlet model temperature of the previous DDPF block is used as the inlet model temperature of the next DDPF block, and the outlet model temperature of the last DDPF block is used as the downstream model temperature of the DDPF. The feedforward injection quantity is obtained based on the engine exhaust gas flow rate, the inlet model temperature of each DDPF block, and the expected outlet temperature. Based on the first deviation between the expected outlet temperature and the outlet model temperature of each DDPF block, the second deviation between the downstream model temperature and the measured downstream temperature of DDPF, and the graded correction of the upstream temperature of DDPF by combining the cumulative value of the second deviation, the feedback injection quantity is obtained. The target fuel injection quantity of the engine is obtained based on the feedforward fuel injection quantity and the feedback fuel injection quantity, and regenerative control is performed accordingly.

[0036] like Figure 2 The diagram shows an integrated oxidation trap; T1 is the upstream temperature sensor of the DDPF, T2 is the differential pressure sensor across the DDPF, T3 is the downstream temperature sensor of the DDPF, and T4 is the DDPF. The soot, NOx, and fuel emitted by the engine are input into the DDPF inlet to capture the soot and oxidize the fuel to raise its temperature, and then discharged into the atmosphere through the DDPF.

[0037] DDPF is an integration of a wall-flow particulate filter and an oxidation catalytic converter. Its uses are: first, to filter particulate matter in exhaust gas, with accumulated particulate matter being eliminated through passive or active regeneration; second, to provide sufficient nitrogen dioxide for passive regeneration; and third, to oxidize hydrocarbons in exhaust gas to provide sufficient temperature for active regeneration.

[0038] When particulate matter accumulates in a DDPF to a certain level, it needs to be oxidized and removed at high temperatures. This process is generally divided into on-the-go regeneration and off-the-go regeneration. On-the-go regeneration occurs when the engine is running, fuel (from the seventh injector) is injected into the DDPF, oxidized by the catalyst, and the exhaust temperature is increased to over 550°C. Compared to the traditional DOC and DPF routes, the particulate matter covering the DDPF affects the contact between the fuel and the catalyst, resulting in different hydrocarbon oxidation efficiencies under different carbon loadings. Furthermore, the oxidation of particulate matter within the DDPF releases a significant amount of heat, which also affects the DDPF's temperature control.

[0039] like Figure 3As shown, the DDPF is divided into 6 equal segments (slice1-slice6), and the temperature of each of the 6 DDPF segments is calculated separately. Because DDPF has a large heat capacity, calculating the temperature of each DDPF segment individually is more accurate. During regeneration, the fuel injection quantity is calculated using the upstream temperature TUs of the DDPF, the downstream temperature Tds of the DDPF, and the exhaust gas flow rate.

[0040] S1: After dividing the DDPF into blocks, construct a temperature model and calculate the outlet model temperature of each DDPF block according to the law of conservation of energy; wherein, the outlet model temperature of each DDPF block is taken as its respective temperature.

[0041] Specifically: ; ; in, The inlet model temperature for DDPF blocks. The outlet model temperature for DDPF segmentation. The wall temperature of the DDPF segment. For ambient temperature, For the specific heat capacity of the exhaust gas, Specific heat capacity of DDPF blocks The heat capacity of DDPF blocks for heat exchange with the environment. This refers to the exhaust mass flow rate. For the quality of DDPF blocks, Because it is a low-calorific-value fuel, This represents the THC (Total Hydrocarbons) mass flow rate upstream of DDPF. THC conversion efficiency for DDPF blocks.

[0042] One method is to calibrate the corresponding parameters by installing thermocouples at the outlet of each DDPF block so that the outlet temperature of each DDPF block matches the actual temperature, thereby obtaining the parameters.

[0043] In this method, the upstream temperature TUs of DDPF is taken as the inlet temperature of the first DDPF block, the total oil volume at the inlet of the entire DDPF is taken as the inlet oil volume of the first DDPF block, and the outlet model temperature of each DDPF block is calculated in sequence according to the above formula. The outlet model temperature of the previous DDPF block is taken as the inlet model temperature of the next DDPF block, and the outlet model temperature of the last DDPF block is taken as the downstream model temperature of DDPF.

[0044] S2: Regenerative temperature control, consisting of feedforward, integrator and proportional controller.

[0045] Specifically: (1) The feedforward part includes: multiplying the deviation between the inlet model temperature and the outlet expected temperature of each DDPF block with the engine exhaust flow rate and the DDPF calibration conversion efficiency to obtain the feedforward fuel injection quantity; wherein, the DDPF calibration conversion efficiency is measured by the test bench under the condition of no carbon deposit.

[0046] (2) The proportional controller section includes: The first deviation is obtained based on the expected outlet temperature and the outlet model temperature of each DDPF block. The first deviation is multiplied by the proportional coefficient and then proportionally controlled to obtain the first feedback injection quantity. The proportional coefficient is a calibration quantity that affects the heating process.

[0047] (3) The integrator section includes: The second deviation is obtained based on the downstream model temperature and the measured downstream temperature of DDPF. The second feedback injection quantity is obtained by combining the cumulative value of the second deviation with integral control; wherein, the integral control is achieved through the observer.

[0048] The integrator addresses the changes in DDPF conversion efficiency (affected by particulate matter accumulation) and the changes in hydrocarbon oxidation efficiency caused by the exothermic oxidation of particulate matter, which in turn lead to steady-state errors. The control lag is addressed by the observer to avoid temperature overshoot.

[0049] (4) Finally, the feedforward injection quantity, the first feedback injection quantity and the second feedback injection quantity are added together to obtain the engine target injection quantity, and regeneration control is performed accordingly.

[0050] In this embodiment, the upstream temperature of DDPF is corrected in stages according to the second cumulative deviation value, and the effectiveness of the correction is determined by the difference between the conversion efficiency after each correction and the conversion efficiency of two adjacent stages.

[0051] Specifically: (1) Enter the regeneration and temperature rise stage, without observer correction, until the downstream temperature of DDPF stabilizes.

[0052] (2) When the cumulative deviation between the downstream model temperature and the downstream measured temperature of DDPF is greater than or equal to 0 (in the direction of oil reduction), the observer is activated, but no graded adjustment is required. The steady-state deviation is compensated until the regeneration ends.

[0053] (3) When the cumulative deviation between the downstream model temperature and the measured downstream temperature of DDPF is less than 0 (in the direction of refueling), the temperature is corrected in stages according to the negative correction temperature limit of the observer, specifically at level 1 -50℃, level 2 -100℃, and level 3 -150℃. Initially, only the correction temperature is calculated, but the fuel injection quantity is not corrected. After the temperature stabilizes, the first DDPF conversion efficiency is calculated.

[0054] If the first DDPF conversion efficiency is greater than the set conversion threshold, then the first-level correction (DDPF upstream temperature -50℃) is activated. After the temperature stabilizes, the second DDPF conversion efficiency is calculated.

[0055] If the absolute value of the difference between the first DDPF conversion efficiency and the second DDPF conversion efficiency is less than the set difference threshold, and both the first DDPF conversion efficiency and the second DDPF conversion efficiency are greater than the set conversion threshold, then the second-level correction (DDPF upstream temperature -100℃) is enabled. After the temperature stabilizes, the third DDPF conversion efficiency is calculated.

[0056] If the absolute value of the difference between the first DDPF conversion efficiency and the second DDPF conversion efficiency, and the absolute value of the difference between the second DDPF conversion efficiency and the third DDPF conversion efficiency are all less than the set difference threshold, and the first DDPF conversion efficiency, the second DDPF conversion efficiency, and the third DDPF conversion efficiency are all greater than the set conversion threshold, then it is determined that the temperature deviation is caused by inaccurate fuel quantity in the injector. The third-level correction (DDPF upstream temperature -150℃) is activated. After the temperature stabilizes, the fourth DDPF conversion efficiency is calculated until the regeneration target temperature (e.g., 600℃) is reached.

[0057] If the absolute value of a certain difference is greater than the set difference threshold, or if the DDPF conversion efficiency is less than the set conversion threshold, the DDPF system is judged to be in failure, regeneration is stopped, and the user is reminded to further investigate (such as the low conversion efficiency of DDPF due to sulfur poisoning).

[0058] The DDPF conversion efficiency is defined as follows: the difference between the measured downstream temperature of DDPF measured by the downstream temperature sensor and the measured upstream temperature of DDPF measured by the upstream temperature sensor, and the difference between the model temperature downstream of DDPF and the measured upstream temperature of DDPF are determined. The two differences are then integrated, and the ratio of the two integrals is the DDPF conversion efficiency.

[0059] Compared to traditional DPF regeneration, DDPF regeneration is less efficient due to the accumulation of particulate matter that coats precious metals, reducing the contact area between fuel and precious metals. This results in differences in regeneration temperature even when using the same calibration data. Furthermore, the exothermic oxidation of particulate matter within the DDPF also affects regeneration temperature control. To compensate for these differences in regeneration temperature control, this embodiment employs an integrator with an observer. Integral control effectively compensates for steady-state errors, and the observer can adjust the integrator in a timely manner, performing multi-stage fuel quantity corrections based on temperature conditions to avoid temperature overshoot or undershoot.

[0060] Furthermore, the method in this embodiment can also identify the cause of large regeneration temperature deviation. If the insufficient regeneration temperature is caused by inaccurate fuel injection, multi-stage fuel quantity correction can be performed through the observer. When the conversion efficiency deviation between each stage of fuel quantity correction is less than the set difference threshold and the conversion efficiency of each stage of DDPF can reach the set conversion threshold, it is proven that the fuel quantity correction is effective, and fuel quantity correction continues until the downstream temperature of DDPF reaches the regeneration target temperature. If the conversion efficiency of DDPF is low due to sulfur poisoning or other reasons, fuel quantity correction is not performed, regeneration is stopped, and a DDPF system failure is reported.

[0061] Example 2 This embodiment provides an integrated regeneration temperature control system for an oxidation trap, including: The modeling module is configured to divide DDPF into blocks and build temperature models to obtain the outlet model temperature of each DDPF block; wherein, the upstream temperature of DDPF is used as the inlet temperature of the first DDPF block, the outlet model temperature of the previous DDPF block is used as the inlet model temperature of the next DDPF block, and the outlet model temperature of the last DDPF block is used as the downstream model temperature of DDPF. The feedforward module is configured to obtain the feedforward injection quantity based on the engine exhaust gas flow rate, the inlet model temperature of each DDPF block, and the desired outlet temperature. The feedback module is configured to obtain the feedback injection quantity based on the first deviation between the expected outlet temperature and the outlet model temperature of each DDPF block, the second deviation between the downstream model temperature and the measured downstream temperature of DDPF, and the graded correction of the upstream temperature of DDPF by combining the cumulative value of the second deviation. The control module is configured to obtain the engine target injection quantity based on the feedforward injection quantity and the feedback injection quantity, and then perform regenerative control.

[0062] It should be noted that the above modules correspond to the steps described in Embodiment 1, and the examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the content disclosed in Embodiment 1. It should also be noted that the above modules, as part of the system, can be executed in a computer system such as a set of computer-executable instructions.

[0063] In further embodiments, the following is also provided: A diesel engine aftertreatment system includes an integrated oxidation trap and an engine, as well as an integrated oxidation trap regeneration temperature control system for a vehicle as described in Example 2.

[0064] An electronic device includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, perform the method described in Embodiment 1. For brevity, further details are omitted here.

[0065] It should be understood that in this embodiment, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0066] Memory may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of memory may also include non-volatile random access memory. For example, memory may also store information about the device type.

[0067] A computer-readable storage medium for storing computer instructions, which, when executed by a processor, perform the method described in Embodiment 1.

[0068] The method in Example 1 can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor. The software modules can reside in readily available storage media in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, a detailed description is not provided here.

[0069] A computer program product includes a computer program that, when executed by a processor, implements the method described in Embodiment 1.

[0070] The present invention also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as instructions included in program modules, which execute in a device on a target real or virtual processor to perform the processes / methods described above. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc., that perform specific tasks or implement specific abstract data types. In various embodiments, the functionality of program modules can be combined or divided among program modules as needed. The machine-executable instructions for the program modules can execute within a local or distributed device. In a distributed device, the program modules can reside in both local and remote storage media.

[0071] The computer program code used to implement the methods of the present invention may be written in one or more programming languages. This computer program code may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the computer or other programmable data processing device, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a computer, partially on a computer, as a stand-alone software package, partially on a computer and partially on a remote computer, or entirely on a remote computer or server.

[0072] In the context of this invention, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus, or processor to perform the various processes and operations described above. Examples of carriers include signals, computer-readable media, and the like. Examples of signals may include electrical, optical, radio, sound, or other forms of propagation signals, such as carrier waves, infrared signals, etc.

[0073] Those skilled in the art will recognize that the units and algorithm steps described in connection with the various examples of this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0074] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for controlling the regeneration temperature of an integrated oxidation trap, characterized in that, include: The DDPF is divided into blocks and temperature models are constructed to obtain the outlet model temperature of each DDPF block. The upstream temperature of the DDPF is used as the inlet temperature of the first DDPF block, the outlet model temperature of the previous DDPF block is used as the inlet model temperature of the next DDPF block, and the outlet model temperature of the last DDPF block is used as the downstream model temperature of the DDPF. The feedforward injection quantity is obtained based on the engine exhaust gas flow rate, the inlet model temperature of each DDPF block, and the expected outlet temperature. Based on the first deviation between the expected outlet temperature and the outlet model temperature of each DDPF block, the second deviation between the downstream model temperature and the measured downstream temperature of DDPF, and the graded correction of the upstream temperature of DDPF by combining the cumulative value of the second deviation, the feedback injection quantity is obtained. The target fuel injection quantity of the engine is obtained based on the feedforward fuel injection quantity and the feedback fuel injection quantity, and regenerative control is performed accordingly. The graded correction process includes: when the cumulative second deviation between the downstream model temperature and the measured downstream temperature of DDPF is less than 0, graded correction is performed according to the set negative correction temperature limit, and the DDPF conversion efficiency after each correction is calculated; the effectiveness of the correction is determined based on the absolute value of the difference between the conversion efficiencies of two adjacent DDPF levels and the DDPF conversion efficiency after each correction, until the measured downstream temperature of DDPF reaches the regeneration target temperature. The specific steps of the graded correction process include: During the initial correction, only the temperature is corrected, not the fuel injection quantity, and the first DDPF conversion efficiency is calculated. If the conversion efficiency of the first DDPF is greater than the set conversion threshold, then the first-level correction is activated to calculate the conversion efficiency of the second DDPF. If the absolute value of the difference between the first DDPF conversion efficiency and the second DDPF conversion efficiency is less than the set difference threshold, and both the first DDPF conversion efficiency and the second DDPF conversion efficiency are greater than the conversion threshold, then the second-level correction is enabled to calculate the third DDPF conversion efficiency. If the absolute value of the difference between the first DDPF conversion efficiency and the second DDPF conversion efficiency, and the absolute value of the difference between the second DDPF conversion efficiency and the third DDPF conversion efficiency are all less than the difference threshold, and the first DDPF conversion efficiency, the second DDPF conversion efficiency, and the third DDPF conversion efficiency are all greater than the conversion threshold, then it is determined that the temperature deviation is caused by the inaccurate fuel quantity of the injector, the third-level correction is activated, the fourth DDPF conversion efficiency is calculated, until the regeneration target temperature is reached; If the absolute value of the difference is greater than the difference threshold, or if the DDPF conversion efficiency is less than the conversion threshold, then the DDPF is determined to be a failure and regeneration is terminated.

2. The method for controlling the regeneration temperature of an integrated oxidation trap as described in claim 1, characterized in that, The temperature model is as follows: ； in, The inlet model temperature for DDPF blocks. The outlet model temperature for DDPF segmentation. The wall temperature of the DDPF segment. For ambient temperature, For the specific heat capacity of the exhaust gas, Specific heat capacity of DDPF blocks The heat capacity of DDPF blocks for heat exchange with the environment. This refers to the exhaust mass flow rate. For the quality of DDPF blocks, Because it is a low-calorific-value fuel, The THC mass flow rate upstream of DDPF THC conversion efficiency for DDPF blocks.

3. The method for controlling the regeneration temperature of an integrated oxidation trap as described in claim 1, characterized in that, The process of obtaining the feedforward injection quantity includes: multiplying the deviation between the inlet model temperature and the desired outlet temperature of each DDPF block by the engine exhaust gas flow rate and the DDPF calibration conversion efficiency to obtain the feedforward injection quantity.

4. The method for controlling the regeneration temperature of an integrated oxidation trap as described in claim 1, characterized in that, The process of obtaining the target fuel injection quantity for the engine includes: Based on the first deviation, the first feedback fuel injection quantity is obtained through proportional control; Based on the second deviation and combined with the cumulative value of the second deviation, the second feedback injection quantity is obtained through integral control. The target fuel injection quantity of the engine is obtained by adding the feedforward fuel injection quantity, the first feedback fuel injection quantity, and the second feedback fuel injection quantity.

5. An integrated regeneration temperature control system for an oxidation trap, characterized in that, The method for controlling the regeneration temperature of the integrated oxidation trap according to any one of claims 1-4 includes: The modeling module is configured to divide DDPF into blocks and build temperature models to obtain the outlet model temperature of each DDPF block; wherein, the upstream temperature of DDPF is used as the inlet temperature of the first DDPF block, the outlet model temperature of the previous DDPF block is used as the inlet model temperature of the next DDPF block, and the outlet model temperature of the last DDPF block is used as the downstream model temperature of DDPF. The feedforward module is configured to obtain the feedforward injection quantity based on the engine exhaust gas flow rate, the inlet model temperature of each DDPF block, and the desired outlet temperature. The feedback module is configured to obtain the feedback injection quantity based on the first deviation between the expected outlet temperature and the outlet model temperature of each DDPF block, the second deviation between the downstream model temperature and the measured downstream temperature of DDPF, and the graded correction of the upstream temperature of DDPF by combining the cumulative value of the second deviation. The control module is configured to obtain the engine target injection quantity based on the feedforward injection quantity and the feedback injection quantity, and then perform regenerative control.

6. An electronic device, characterized in that, It includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, which, when executed by the processor, perform the method according to any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, Used to store computer instructions, which, when executed by a processor, perform the method described in any one of claims 1-4.

8. A computer program product, characterized in that, Includes a computer program, which, when executed by a processor, implements the method described in any one of claims 1-4.

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