A post-processing regeneration state monitoring method, system, device and storage medium

Abstract

The application discloses a post-processing regeneration state monitoring method, system, device and storage medium, belongs to the diesel engine post-processing technical field, and solves the technical problem that the regeneration state information is not clear. The method is: calibrating and calculating the equivalent coefficient of the DPF regeneration time equivalent to the DPF regeneration reference time under the DPF regeneration temperature; constructing a DPF regeneration fault expert library; enabling DPF regeneration after the DPF regeneration condition is met; acquiring the front-end temperature and the front-rear end pressure difference of the diesel particulate filter in real time; calculating the total working time after multiplying the equivalent coefficient by each front-end temperature working time; when the total working time is greater than or equal to the DPF regeneration reference time and the front-rear end pressure difference is less than the set threshold, the DPF regeneration is completed; calculating the ratio of the total working time to the DPF regeneration reference time as the regeneration completion ratio; if the regeneration process is interrupted, the specific fault is obtained according to the fault code and the DPF regeneration fault expert library; and the regeneration state information is sent to the instrument or other display unit.

Description

Technical Field

[0001] This invention relates to the field of diesel engine aftertreatment technology, and more specifically, to a method, system, device, and storage medium for monitoring the regeneration status of aftertreatment. Background Technology

[0002] The DPF (Digital Fluid Filter) in a diesel engine aftertreatment system needs to be cleaned of carbon deposits and its filtering performance restored through a periodic or triggered regeneration process. Currently, the indication of engine regeneration status is usually quite simple, such as using only a regeneration indicator light (solid or flashing) to inform the driver that regeneration is in progress or that a malfunction has occurred. This simple indication method has significant drawbacks: 1. Unclear information: The driver or maintenance personnel cannot know the specific progress of the regeneration (such as the percentage of completion).

[0003] 2. Ambiguous causes of failure: When regeneration fails to start, is disabled, or is unexpectedly interrupted, the system usually only provides a general "regeneration failure" signal without specifying the exact cause (such as insufficient coolant temperature, low exhaust temperature, or related system failures), making troubleshooting difficult and inefficient.

[0004] Therefore, there is an urgent need for a technical solution that can transmit detailed status information of the regeneration process, especially the progress and reasons for interruption, to instruments or other display units in a standardized and resolvable manner. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a post-treatment regeneration status monitoring method, so that the diesel engine instrument can clearly and accurately display the DPF regeneration progress and specific status information.

[0006] The second objective of this invention is to provide a post-processing regeneration status monitoring system.

[0007] The third objective of this invention is to provide a computer device.

[0008] The fourth objective of this invention is to provide a computer storage medium.

[0009] To achieve the first objective mentioned above, the present invention provides a post-processing regeneration status monitoring method, comprising the following steps: Step 1. Calibrate the DPF regeneration time corresponding to different DPF regeneration temperatures. With the goal of minimizing fuel consumption, select the DPF regeneration reference temperature and DPF regeneration reference time, and calculate the equivalent coefficient of the DPF regeneration time at each DPF regeneration temperature to the equivalent DPF regeneration reference time. Step 2. Collect various faults that occur during the DPF regeneration process and build a DPF regeneration fault expert database; Step 3. Once the DPF regeneration conditions are met, a DPF regeneration request is triggered, and DPF regeneration is initiated. Step 4. Real-time acquisition of the front-end temperature and pressure difference between the front and rear ends of the diesel particulate filter; Step 5. Accumulate the working time of each front-end temperature, multiply the working time of each front-end temperature by the equivalent coefficient corresponding to that front-end temperature, and calculate the total working time; when the total working time is greater than or equal to the DPF regeneration reference time, and the pressure difference between the front and back ends is less than the set threshold, the DPF regeneration is determined to be complete. Step 6. Calculate the ratio of total working time to DPF regeneration reference time as the completion ratio of the current regeneration cycle; if the regeneration process is interrupted, obtain the relevant fault code and query the DPF regeneration fault expert database according to the fault code to obtain the specific fault; trigger the sending of regeneration status information to the instrument or other display unit when periodically sending or when the status changes.

[0010] As a further improvement, in step 1, the equivalent coefficient Ki = T / Ti, where T is the DPF regeneration reference time and Ti is the calibrated DPF regeneration time.

[0011] Furthermore, in step 2, various faults are those that prevent regeneration from starting, are prohibited, or are interrupted, including regeneration prohibition switch not closed, engine coolant temperature below the threshold, exhaust manifold temperature below the threshold, diesel particulate filter body or sensor malfunction, other fault codes in engine control system, engine in transient test mode, engine speed outside the allowable range, and insufficient fuel in the fuel tank.

[0012] Furthermore, in step 3, the DPF regeneration condition is that the pressure difference between the front and rear ends of the diesel particulate filter reaches the regeneration set value or the cumulative working time of the diesel particulate filter reaches the regeneration set time.

[0013] Furthermore, a dedicated controller area network or other vehicle network message is designed, which is periodically sent by the engine controller or after-treatment controller during the regeneration process or triggered when the status changes.

[0014] Furthermore, the message includes a DPF regeneration status flag, a regeneration progress percentage, and a multi-digit status / reason code. The instrument or other display unit receives and parses the message, and looks up the predefined descriptive text based on the reason code to show the user the specific regeneration status or the reason for the regeneration failure.

[0015] Furthermore, the message must include at least the following fields: Regeneration status identifier field: used to indicate whether regeneration is activated, in progress, completed, disabled, or interrupted; Regeneration progress percentage field: Used to indicate the completion rate of the current regeneration cycle, with a value ranging from 0% to 100%; Regeneration Status / Cause Code Field: Used to encode all specific faults that cause the regeneration process to be interrupted.

[0016] To achieve the second objective mentioned above, the present invention provides a post-processing regeneration status monitoring system, comprising: The calibration module is used to calibrate the DPF regeneration time corresponding to different DPF regeneration temperatures. With the goal of minimizing fuel consumption, it selects the DPF regeneration reference temperature and DPF regeneration reference time, and calculates the equivalent coefficient of the DPF regeneration time at each DPF regeneration temperature to the equivalent DPF regeneration reference time. The fault expert database module is used to collect various faults that occur in the DPF regeneration process and build a DPF regeneration fault expert database. The regeneration module is used to trigger a DPF regeneration request and initiate DPF regeneration when the DPF regeneration conditions are met. The real-time detection module is used to acquire the front-end temperature and the pressure difference between the front and rear ends of the diesel particulate filter in real time. The determination module is used to accumulate the working time of each front-end temperature. The working time of each front-end temperature is multiplied by the equivalent coefficient corresponding to that front-end temperature to calculate the total working time. When the total working time is greater than or equal to the DPF regeneration reference time and the pressure difference between the front and back ends is less than the set threshold, the DPF regeneration is determined to be complete. The status module is used to calculate the ratio of the total working time to the DPF regeneration reference time as the completion ratio of the current regeneration cycle; if the regeneration process is interrupted, the relevant fault code is obtained, and the specific fault is obtained by querying the DPF regeneration fault expert database based on the fault code; when periodically sending or when the status changes, the regeneration status information is sent to the instrument or other display unit.

[0017] To achieve the third objective mentioned above, the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the post-processing regeneration state monitoring method described above.

[0018] To achieve the fourth objective mentioned above, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the post-processing regeneration state monitoring method described above.

[0019] Beneficial effects Compared with the prior art, the advantages of this invention are as follows: 1. This invention first calibrates the DPF regeneration reference temperature and DPF regeneration reference time, and calculates the equivalent coefficient at different temperatures. The total DPF regeneration time of the diesel particulate filter at different temperatures is accumulated, multiplied by the equivalent coefficient corresponding to the front-end temperature, and the total working time is calculated. When the total working time is greater than or equal to the DPF regeneration reference time, and the pressure difference between the front and back ends is less than the set threshold, the DPF regeneration is determined to be complete. This can improve the accuracy of determining the completion of DPF regeneration, thereby reducing fuel consumption.

[0020] 2. This invention calculates the ratio of the total working time to the DPF regeneration reference time as the completion ratio of the current regeneration cycle. When the regeneration process is interrupted, the specific fault is obtained by querying the DPF regeneration fault expert database according to the fault code, and the completion ratio and the regeneration status information of the specific fault are given to the instrument or other display unit, so that the diesel engine instrument or other display unit can clearly and accurately display the DPF regeneration progress and specific status information. Attached Figure Description

[0021] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0023] See Figure 1 A method for monitoring the post-processing regeneration status, characterized by comprising the following steps 1 to 6: Step 1. Calibrate the DPF regeneration time corresponding to different DPF regeneration temperatures. With the goal of minimizing fuel consumption, select the DPF regeneration reference temperature and DPF regeneration reference time, and calculate the equivalent coefficient of the DPF regeneration time at each DPF regeneration temperature to the equivalent DPF regeneration reference time.

[0024] Within the effective DPF regeneration temperature range (e.g., 550℃~650℃), the higher the temperature, the shorter the regeneration time.

[0025] The equivalent coefficient Ki = T / Ti, where T is the DPF regeneration reference time and Ti is the calibrated DPF regeneration time. This indicates that the higher the temperature, the larger the corresponding Ki. When the DPF regeneration temperature is higher than the DPF regeneration reference temperature, Ki > 1; when the DPF regeneration temperature is lower than the DPF regeneration reference temperature, Ki < 1.

[0026] Step 2. Collect various faults that occur during the DPF regeneration process and build a DPF regeneration fault expert database.

[0027] Various faults refer to those that prevent, prohibit, or interrupt regeneration. In this embodiment, various faults include: the regeneration prohibition switch not closing; engine coolant temperature below the threshold; exhaust manifold temperature below the threshold; diesel particulate filter body or sensor malfunction; other fault codes in the engine control system; engine in transient test mode; engine speed outside the allowable range; and insufficient fuel in the tank. Of course, the faults of this invention are not limited to the above-mentioned faults; any fault that prevents, prohibits, or interrupts regeneration is acceptable.

[0028] Step 3. Once the DPF regeneration conditions are met, a DPF regeneration request is triggered, and DPF regeneration is initiated.

[0029] In this embodiment, the DPF regeneration condition is that the pressure difference between the front and rear ends of the diesel particulate filter reaches the regeneration set value or the cumulative working time of the diesel particulate filter (i.e., the working time of the engine) reaches the regeneration set time.

[0030] Step 4. Real-time acquisition of the front-end temperature and front-end pressure difference of the diesel particulate filter (DPF).

[0031] Specifically, a temperature sensor is installed upstream of the diesel particulate filter to obtain the upstream temperature, which is used as the DPF regeneration temperature. Differential pressure sensors are installed at both ends of the diesel particulate filter to obtain the pressure difference between the upstream and downstream ends.

[0032] Step 5. Accumulate the working time of each front-end temperature, multiply the working time of each front-end temperature by the equivalent coefficient corresponding to that front-end temperature, and calculate the total working time. ( This represents the operating time of the j-th front-end temperature. This is the equivalent coefficient corresponding to the front-end temperature, i.e., the equivalent coefficient obtained in step 1); when the total working time is greater than or equal to the DPF regeneration reference time, i.e. When the pressure difference between the front and rear ends is less than the set threshold, the DPF regeneration is considered complete. This can improve the accuracy of determining the completion of DPF regeneration, thereby reducing fuel consumption (since the actual regeneration temperature is not constant but fluctuates, using a fixed regeneration time to determine the completion of DPF regeneration may result in incomplete regeneration or continued fuel injection after regeneration is completed).

[0033] If the total working time exceeds the DPF regeneration reference time plus the safety time threshold, and the pressure difference between the front and rear ends is not less than the set threshold, there may be a fault in the diesel particulate filter body or the differential pressure sensor. In this case, DPF regeneration will be stopped and the fault will be reported.

[0034] Step 6. Calculate the ratio of total working time to DPF regeneration reference time as the completion ratio of the current regeneration cycle; if the regeneration process is interrupted, obtain the relevant fault code and query the DPF regeneration fault expert database according to the fault code to obtain the specific fault; trigger the sending of regeneration status information to the instrument or other display unit when periodically sending or when the status changes.

[0035] This invention designs a dedicated set of Controller Area Network (CAN) or other vehicle network messages, which are periodically sent by the engine controller (ECU) or after-treatment controller during the regeneration process or triggered when the status changes.

[0036] The message contains the DPF regeneration status flag, the regeneration progress percentage, and a multi-digit status / reason code. The instrument or other display unit receives and parses the message, and looks up the predefined descriptive text based on the reason code to show the user the specific regeneration status or the reason for the failure to regenerate.

[0037] Specifically, the message should include at least the following fields: Regeneration status identifier field: used to indicate whether regeneration is activated, in progress, completed, disabled, or interrupted; Regeneration progress percentage field: Used to indicate the completion rate of the current regeneration cycle, with a value ranging from 0% to 100%; Regeneration Status / Cause Code Field: Used to encode all specific faults that cause the regeneration process to be interrupted, in order to help quickly find the specific reasons why regeneration cannot be started, is disabled, or is unexpectedly interrupted, and improve the efficiency of troubleshooting.

[0038] A post-processing regeneration status monitoring system, comprising: The calibration module is used to calibrate the DPF regeneration time corresponding to different DPF regeneration temperatures. With the goal of minimizing fuel consumption, it selects the DPF regeneration reference temperature and DPF regeneration reference time, and calculates the equivalent coefficient of the DPF regeneration time at each DPF regeneration temperature to the equivalent DPF regeneration reference time. The fault expert database module is used to collect various faults that occur in the DPF regeneration process and build a DPF regeneration fault expert database. The regeneration module is used to trigger a DPF regeneration request and initiate DPF regeneration when the DPF regeneration conditions are met. The real-time detection module is used to acquire the front-end temperature and the pressure difference between the front and rear ends of the diesel particulate filter in real time. The determination module is used to accumulate the working time of each front-end temperature. The working time of each front-end temperature is multiplied by the equivalent coefficient corresponding to that front-end temperature to calculate the total working time. When the total working time is greater than or equal to the DPF regeneration reference time and the pressure difference between the front and back ends is less than the set threshold, the DPF regeneration is determined to be complete. The status module is used to calculate the ratio of the total working time to the DPF regeneration reference time as the completion ratio of the current regeneration cycle; if the regeneration process is interrupted, the relevant fault code is obtained, and the specific fault is obtained by querying the DPF regeneration fault expert database based on the fault code; when periodically sending or when the status changes, the regeneration status information is sent to the instrument or other display unit.

[0039] A computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the post-processing regeneration state monitoring method described above.

[0040] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described post-processing regeneration state monitoring method.

[0041] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for monitoring the post-processing regeneration status, characterized in that, Includes the following steps: Step 1. Calibrate the DPF regeneration time corresponding to different DPF regeneration temperatures. With the goal of minimizing fuel consumption, select the DPF regeneration reference temperature and DPF regeneration reference time, and calculate the equivalent coefficient of the DPF regeneration time at each DPF regeneration temperature to the equivalent DPF regeneration reference time. Step 2. Collect various faults that occur during the DPF regeneration process and build a DPF regeneration fault expert database; Step 3. Once the DPF regeneration conditions are met, a DPF regeneration request is triggered, and DPF regeneration is initiated. Step 4. Real-time acquisition of the front-end temperature and pressure difference between the front and rear ends of the diesel particulate filter; Step 5. Accumulate the working time of each front-end temperature, multiply the working time of each front-end temperature by the equivalent coefficient corresponding to that front-end temperature, and calculate the total working time. When the total working time is greater than or equal to the DPF regeneration reference time, and the pressure difference between the front and back ends is less than the set threshold, the DPF regeneration is determined to be complete. Step 6. Calculate the ratio of total working time to DPF regeneration reference time as the completion rate of the current regeneration cycle; If the regeneration process is interrupted, relevant fault codes are obtained, and the specific fault is obtained by querying the DPF regeneration fault expert database based on the fault codes; regeneration status information is sent to the instrument or other display units when periodic transmission or status change occurs.

2. The post-processing regeneration status monitoring method according to claim 1, characterized in that, In step 1, the equivalent coefficient Ki = T / Ti, where T is the DPF regeneration reference time and Ti is the calibrated DPF regeneration time.

3. The post-processing regeneration status monitoring method according to claim 1, characterized in that, In step 2, various faults are those that prevent regeneration from starting, are prohibited, or are interrupted, including regeneration prohibition switch not closed, engine coolant temperature below the threshold, exhaust manifold temperature below the threshold, diesel particulate filter body or sensor malfunction, other fault codes in engine control system, engine in transient test mode, engine speed outside the allowable range, and insufficient fuel in the tank.

4. The post-processing regeneration status monitoring method according to claim 1, characterized in that, In step 3, the DPF regeneration conditions are that the pressure difference between the front and rear ends of the diesel particulate filter reaches the regeneration set value or the cumulative working time of the diesel particulate filter reaches the regeneration set time.

5. A post-processing regeneration status monitoring method according to any one of claims 1-4, characterized in that, Design a dedicated controller area network or other vehicle network message system, which is periodically sent by the engine controller or after-treatment controller during the regeneration process or triggered when the status changes.

6. The post-processing regeneration status monitoring method according to claim 5, characterized in that, The message contains the DPF regeneration status flag, regeneration progress percentage, and a multi-digit status / reason code. The instrument or other display unit receives and parses the message, and looks up the predefined descriptive text based on the reason code to show the user the specific regeneration status or the reason for the regeneration failure.

7. The post-processing regeneration status monitoring method according to claim 6, characterized in that, The message must include at least the following fields: Regeneration status identifier field: used to indicate whether regeneration is activated, in progress, completed, disabled, or interrupted; Regeneration progress percentage field: Used to indicate the completion rate of the current regeneration cycle, with a value ranging from 0% to 100%; Regeneration Status / Cause Code Field: Used to encode all specific faults that cause the regeneration process to be interrupted.

8. A post-processing regeneration status monitoring system, characterized in that, include: The calibration module is used to calibrate the DPF regeneration time corresponding to different DPF regeneration temperatures. With the goal of minimizing fuel consumption, it selects the DPF regeneration reference temperature and DPF regeneration reference time, and calculates the equivalent coefficient of the DPF regeneration time at each DPF regeneration temperature to the equivalent DPF regeneration reference time. The fault expert database module is used to collect various faults that occur in the DPF regeneration process and build a DPF regeneration fault expert database. The regeneration module is used to trigger a DPF regeneration request and initiate DPF regeneration when the DPF regeneration conditions are met. The real-time detection module is used to acquire the front-end temperature and the pressure difference between the front and rear ends of the diesel particulate filter in real time. The determination module is used to accumulate the working time of each front-end temperature, and calculate the total working time by multiplying the working time of each front-end temperature by the equivalent coefficient corresponding to that front-end temperature. When the total working time is greater than or equal to the DPF regeneration reference time, and the pressure difference between the front and back ends is less than the set threshold, the DPF regeneration is determined to be complete. The status module is used to calculate the ratio of the total working time to the DPF regeneration reference time, which serves as the completion rate of the current regeneration cycle. If the regeneration process is interrupted, relevant fault codes are obtained, and the specific fault is obtained by querying the DPF regeneration fault expert database based on the fault codes; regeneration status information is sent to the instrument or other display units when periodic transmission or status change occurs.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements a post-processing regeneration status monitoring method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the post-processing regeneration state monitoring method according to any one of claims 1-7.

Images