DPF parking regeneration control method, device, electronic device and storage medium

Abstract

The present invention relates to a DPF parking regeneration control method, device, electronic device, and storage medium, belonging to the field of vehicle control technology. The method comprises: upon receiving a parking regeneration request, obtaining a temperature deviation between the DOC inlet temperature and a target temperature; when the temperature deviation is outside a preset range, adjusting the inlet temperature based on the engine's combustion parameters and operating parameters; and controlling the vehicle to perform parking regeneration until the temperature deviation is within the preset range. The DPF parking regeneration control method provided by the present invention can ensure that unburned HC entering the DOC can be efficiently and rapidly oxidized to release heat and burn to eliminate carbon soot trapped in the DPF. It can also achieve high consistency in parking regeneration temperature and regeneration efficiency under different vehicle operating environments, thereby reducing the risk of unsuccessful parking regeneration or low regeneration efficiency.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a DPF parking regeneration control method, device, electronic equipment and storage medium. Background Art

[0002] Diesel engine emission regulations are becoming increasingly stringent, necessitating the addition of aftertreatment systems to meet China VI emission standards. Harmful particulate matter from engine exhaust is captured and stored in a particulate trap, primarily composed of soot. This soot can be burned in the diesel particulate filter (DPF) through passive and active regeneration, restoring normal DPF function. When the DPF accumulates increasing amounts of particulate matter under specific vehicle operating conditions, active regeneration is necessary to restore DPF function. When the DPF detects that the particulate matter concentration exceeds a certain threshold, the electronic control unit (ECU) prohibits driving regeneration and requests parked regeneration to reduce the DPF concentration to ensure safety. Parked regeneration can be initiated by the driver with a single button press or by service station personnel using an external diagnostic tool. Traditional engine control systems typically use a single high idle mode for DPF parked regeneration, optimizing combustion parameters to meet regenerative heat management requirements.

[0003] The current parking regeneration operating condition is based on an engine test bench that simulates a vehicle's high idle condition. This calibrates engine combustion parameters to ensure the diesel oxidation catalyst (DOC) inlet temperature reaches the target setpoint, allowing unburned hydrocarbons (HC) to ignite and release heat in the DOC, ultimately leading to soot combustion in the DPF. This parking regeneration condition uses a single combustion parameter and is applied to the same vehicle model. Exhaust temperature deviations caused by factors such as vehicle production errors cannot be compensated for, leading to significant variability in parking regeneration heat management temperatures between vehicles of the same model. Furthermore, during the development process, the parking regeneration condition is field-verified in various environments (high temperatures, high altitudes, and cold weather) to optimize combustion parameters to meet parking regeneration requirements.

[0004] The existing parking regeneration combustion parameters are calibrated on the engine bench and then verified and optimized on the vehicle. The number of vehicle and vehicle usage environment samples is small, the parking regeneration thermal management combustion parameters are poorly adaptable to different vehicles, and the regeneration temperature of the parking regeneration condition varies greatly. Some vehicles may face the risk of unsuccessful regeneration or low regeneration efficiency. Summary of the Invention

[0005] In view of this, it is necessary to provide a DPF parking regeneration control method, device, electronic device and storage medium to solve the problems of unsuccessful regeneration and low regeneration efficiency during existing parking regeneration.

[0006] In order to solve the above problems, the present invention provides a DPF parking regeneration control method, comprising:

[0007] Upon receiving a parking regeneration request, obtaining a temperature deviation between a DOC inlet temperature and a target temperature;

[0008] When the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine;

[0009] When the temperature deviation is within the preset range, the vehicle is controlled to perform parking regeneration.

[0010] In a possible implementation, the combustion parameters include: target air-fuel ratio, post-injection amount, and main injection timing;

[0011] The operating parameters include engine speed and engine load.

[0012] In one possible implementation, when the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine includes:

[0013] When the temperature deviation is greater than the maximum value within the preset range, the following operations are performed in sequence to adjust the inlet temperature:

[0014] Reduce engine speed, reduce engine load, increase target air-fuel ratio, reduce post-injection amount and increase main injection timing.

[0015] In one possible implementation, when the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine includes:

[0016] When the temperature deviation is less than the minimum value within the preset range, the following operations are performed in sequence to adjust the inlet temperature:

[0017] Increase engine load, increase engine speed, reduce target air-fuel ratio, increase post-injection amount and reduce main injection timing.

[0018] In a possible implementation, after controlling the vehicle to perform parking regeneration until the temperature deviation is within the preset range, the method further includes:

[0019] storing combustion parameters and operating condition parameters corresponding to the temperature deviation;

[0020] When the environmental factors of the vehicle during two adjacent parking regenerations are the same, the inlet temperature is adjusted based on the combustion parameters and operating condition parameters corresponding to the temperature deviation.

[0021] In a possible implementation, before obtaining the temperature deviation between the DOC inlet temperature and the target temperature when the parking regeneration request is received, the method further includes:

[0022] The target temperature is determined based on the ambient atmospheric pressure and ambient temperature of the vehicle's current environment.

[0023] The present invention also provides a DPF parking regeneration control device, comprising:

[0024] an acquisition module, configured to acquire a temperature deviation between an inlet temperature of the DOC and a target temperature upon receiving a parking regeneration request;

[0025] an adjusting module, configured to adjust the inlet temperature based on combustion parameters and operating condition parameters of the engine when the temperature deviation is outside a preset range;

[0026] The control module is configured to control the vehicle to perform parking regeneration until the temperature deviation is within the preset range.

[0027] On the other hand, the present invention also provides an electronic device, comprising a memory and a processor, wherein:

[0028] The memory is used to store programs;

[0029] The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the DPF parking regeneration control method described in any of the above implementations.

[0030] On the other hand, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the DPF parking regeneration control method described in any of the above implementations is implemented.

[0031] On the other hand, the present invention further provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the DPF parking regeneration control method described in any of the above implementations is implemented.

[0032] The beneficial effects of the present invention are as follows: the DPF parking regeneration control method, device, electronic device and storage medium provided by the present invention obtain the temperature deviation between the DOC inlet temperature and the target temperature when receiving a parking regeneration request. When the temperature deviation is outside the preset range, the DOC inlet temperature can be quickly adjusted by adjusting the engine's combustion parameters and operating parameters, so that the temperature deviation is stabilized within the preset range to ensure that the unburned HC entering the DOC can be efficiently and quickly oxidized to release heat to burn and eliminate the carbon soot captured in the DPF. A high degree of consistency in parking regeneration temperature and regeneration efficiency can be achieved under different operating environments of different vehicles, thereby reducing the risk of unsuccessful parking regeneration or low regeneration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a method flow chart of one embodiment of the DPF parking regeneration control method provided by the present invention;

[0035] Figure 2 A schematic structural diagram of an embodiment of a DPF parking regeneration control system provided by the present invention;

[0036] Figure 3 This is a second method flow chart of an embodiment of the DPF parking regeneration control method provided by the present invention;

[0037] Figure 4 A schematic structural diagram of an embodiment of a closed-loop control module provided by the present invention;

[0038] Figure 5 A schematic diagram of the parking regeneration intelligent adjustment mode coordinator provided by the present invention;

[0039] Figure 6 A schematic structural diagram of an embodiment of a DPF parking regeneration control device provided by the present invention;

[0040] Figure 7 This is a schematic structural diagram of an embodiment of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] In the description of the embodiments of the present invention, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone.

[0043] The terms "first," "second," and so on, used in the embodiments of the present invention are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, technical features designated as "first" or "second" may explicitly or implicitly include at least one such feature.

[0044] Figure 1 This is a method flow chart of an embodiment of the DPF parking regeneration control method provided by the present invention, as shown in FIG. Figure 1 As shown, the DPF parking regeneration control method includes:

[0045] S101. Upon receiving a parking regeneration request, obtaining a temperature deviation between a DOC inlet temperature and a target temperature;

[0046] S102: When the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine;

[0047] S103 : When the temperature deviation is within the preset range, control the vehicle to perform parking regeneration.

[0048] It should be noted that the target temperature of the DOC can be obtained according to the current atmospheric pressure and ambient temperature of the vehicle.

[0049] Compared with the prior art, the DPF parking regeneration control method provided by the embodiment of the present invention obtains the temperature deviation between the DOC inlet temperature and the target temperature when receiving a parking regeneration request. When the temperature deviation is outside the preset range, the DOC inlet temperature can be quickly adjusted by adjusting the engine's combustion parameters and operating parameters to stabilize the temperature deviation within the preset range, so as to ensure that the unburned HC entering the DOC can be efficiently and quickly oxidized to release heat and burn to eliminate the carbon soot captured in the DPF. It can achieve a high degree of consistency in the parking regeneration temperature and regeneration efficiency under different operating environments of different vehicles, thereby reducing the risk of unsuccessful parking regeneration or low regeneration efficiency.

[0050] In some embodiments of the present invention, the combustion parameters include: target air-fuel ratio, post-injection amount, and main injection timing;

[0051] The operating parameters include engine speed and engine load.

[0052] The target air-fuel ratio refers to the mass ratio of air to fuel in the mixture. During DPF regeneration, adjusting the air-fuel ratio can optimize combustion efficiency, thereby affecting exhaust temperature. A lower air-fuel ratio increases exhaust temperature, which helps to burn carbon particles.

[0053] Post-injection fuel injection refers to the additional fuel injected after the main injection to increase exhaust temperature and promote the combustion of carbon particles in the DPF. By increasing the post-injection fuel injection amount, the exhaust temperature can be directly increased, thereby accelerating the regeneration process of the DPF.

[0054] Main injection timing refers to the timing of the main fuel injection, typically expressed in crankshaft degrees. Adjusting main injection timing can influence the onset and efficiency of combustion, thereby indirectly regulating exhaust temperature. Proper main injection timing ensures optimal fuel combustion, ensuring both power output and effective DPF regeneration.

[0055] Engine speed refers to the number of revolutions per minute (RPM) of the engine, which is directly related to the engine's operating status and exhaust flow. Increasing engine speed increases exhaust flow and temperature, which helps increase the DOC inlet temperature, thereby accelerating DPF regeneration.

[0056] Engine load reflects the engine's current power output and is closely related to the fuel injection rate and throttle opening. Increasing engine load increases fuel supply, which in turn raises exhaust temperature, helping to quickly reach the required temperature during DPF regeneration.

[0057] In some embodiments of the present invention, when the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine includes:

[0058] When the temperature deviation is greater than the maximum value within the preset range, the following operations are performed in sequence to adjust the inlet temperature:

[0059] Reduce engine speed, reduce engine load, increase target air-fuel ratio, reduce post-injection amount and increase main injection timing.

[0060] For example, the preset range can be expressed as [T Error_MIN , T Error_MAX ], that is, the minimum and maximum values ​​within the preset range are T Error_MIN and T Error_MAX .

[0061] Temperature deviation (T 4-error ) is the DOC inlet temperature (T4) and the target temperature (T 4-target ) is the difference between them.

[0062] When the temperature deviation is greater than the maximum value within the preset range, that is, T 4-error >T Error_MAX The actual DOC inlet temperature can be reduced by reducing the engine speed (e.g., in steps of 100 rpm) or reducing the engine load (reducing the fan speed or disengaging the fan).

[0063] Specifically, T 4-error >T Error_MAX The following operations are performed in sequence for adjustment: reduce the engine speed (reduce in steps of 100 rpm), reduce the engine load (disconnect the fan or reduce the fan speed), increase the target air-fuel ratio (increase in certain steps or increase by a certain proportional coefficient), reduce the near-rear injection amount (reduce by a certain proportional coefficient), and increase the main injection timing (increase in certain steps).

[0064] If the actual DOC inlet temperature and the DOC inlet target temperature still cannot meet the target requirements after completing all the above adjustments and the DOC inlet temperature remains at a high temperature for a long time, the vehicle can be diagnosed and tested after completing parking regeneration.

[0065] The DPF parked regeneration control method provided by the present invention ensures that the exhaust temperature remains within an appropriate range during DPF parked regeneration, effectively regenerating particulate matter while avoiding damage to the DPF. By precisely controlling engine operating parameters, the exhaust temperature can be precisely adjusted, achieving efficient and safe regeneration.

[0066] In some embodiments of the present invention, when the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine includes:

[0067] When the temperature deviation is less than the minimum value within the preset range, the following operations are performed in sequence to adjust the inlet temperature:

[0068] Increase engine load, increase engine speed, reduce target air-fuel ratio, increase post-injection amount and reduce main injection timing.

[0069] When the temperature deviation is less than the minimum value within the preset range, that is, T 4-error <T Error_MIN , the actual DOC inlet temperature can be increased by increasing the engine speed (e.g., in steps of 100 rpm) or increasing the engine load (fully engaging the fan or increasing the fan speed).

[0070] Specifically, T 4-error <T Error_MIN When the engine load is increased, the following operations are performed in sequence for adjustment: increase the engine load, increase the engine speed by 100 rpm (the upper limit can be calibrated), reduce the target air-fuel ratio, increase the near-post injection amount, and reduce the main injection timing.

[0071] In order to consider the reliability of key engine components during the process of lowering the target air-fuel ratio, it is necessary to limit the minimum throttle opening (this can be achieved through closed-loop control by minimizing the intake manifold pressure, and different limits can be set at different altitudes).

[0072] When the NOx sensor signal is valid, the system limits the correction coefficients for combustion parameters such as the air-fuel ratio, main injection timing, and post-injection fuel quantity by measuring the minimum oxygen concentration at the DOC inlet (to ensure sufficient combustion and heat release of unburned fuel in the DOC). If the DOC inlet oxygen concentration reaches the minimum limit, engine combustion parameter correction is stopped. When the NOx sensor is ready, the air-fuel ratio correction is limited by the minimum throttle opening to prevent excessively low oxygen concentrations and reduce the reliability of key engine components.

[0073] If after all the above adjustments, the actual DOC inlet temperature and the DOC inlet target temperature still cannot meet the target requirements and the DOC inlet temperature remains at a low temperature for a long time, the parking regeneration condition will be exited to remind the driver to go to a service station for engine or vehicle diagnostic testing.

[0074] The DPF parked regeneration control method provided by the present invention ensures that the exhaust temperature remains within an appropriate range during DPF parked regeneration, effectively regenerating particulate matter while avoiding damage to the DPF. By precisely controlling engine operating parameters, the exhaust temperature can be precisely adjusted, achieving efficient and safe regeneration.

[0075] In some embodiments of the present invention, after controlling the vehicle to perform parking regeneration until the temperature deviation is within a preset range, the method further includes:

[0076] storing combustion parameters and operating condition parameters corresponding to the temperature deviation;

[0077] When the environmental factors of the vehicle during two adjacent parking regenerations are the same, the inlet temperature is adjusted based on the combustion parameters and operating condition parameters corresponding to the temperature deviation.

[0078] When it is detected that the vehicle receives a parking regeneration request again, it is determined whether the current vehicle parking regeneration environmental factors (such as atmospheric pressure, ambient temperature, air conditioning status, etc.) are consistent with the parking regeneration environmental factors stored during the previous parking regeneration.

[0079] If it is determined to be consistent, the inlet temperature is quickly brought to the target temperature range based on the combustion parameters and operating condition parameters corresponding to the temperature deviation during the previous parking regeneration, completing the parking regeneration quickly and efficiently.

[0080] If it is determined that the vehicle environmental factors are inconsistent with those during the last parking regeneration, the above steps are repeated again until the parking regeneration is completed.

[0081] The DPF parking regeneration control method provided by the embodiment of the present invention can achieve parking regeneration DOC inlet temperature control to quickly reach the target temperature for vehicles under the same environment, thereby greatly reducing the closed-loop control adjustment process.

[0082] In some embodiments of the present invention, before obtaining the temperature deviation between the DOC inlet temperature and the target temperature upon receiving the parking regeneration request, the method further includes:

[0083] The target temperature is determined based on the ambient atmospheric pressure and ambient temperature of the vehicle's current environment.

[0084] For example, the DOC inlet target temperature may be obtained by looking up a table based on the current atmospheric pressure and temperature of the vehicle's environment. The table may be pre-calibrated.

[0085] After judging that the actual temperature of DOC inlet is stable, compare it with the target temperature of DOC inlet and calculate the temperature deviation T between the two. 4-error .

[0086] The DPF parking regeneration control method provided by the embodiment of the present invention sets different DOC inlet target temperatures under different environments, and implements DOC inlet temperature closed-loop control with the deviation between the DOC inlet temperature and the target temperature as the target, so as to achieve consistency of vehicle parking regeneration control when the vehicle is in the same environment.

[0087] In addition, the present invention provides a DPF parking regeneration control system, Figure 2 This is a structural diagram of an embodiment of the DPF parking regeneration control system provided by the present invention, as shown in FIG. Figure 2 As shown, the DPF parking regeneration control system includes three modules: a judgment module, a closed-loop control module and a self-learning module.

[0088] The judgment module monitors the parking regeneration request status of the vehicle and calculates the deviation between the actual DOC inlet temperature and the DOC inlet target temperature; determines whether to start and activate the closed-loop control module to perform intelligent closed-loop control of the parking regeneration temperature by judging whether the actual DOC inlet temperature and the DOC inlet target temperature are within a reasonable range; and determines whether to enable the self-learning module by comparing the vehicle's current parking regeneration environmental factors with the previous parking regeneration environmental factors.

[0089] The closed-loop control module performs closed-loop regulation of the DOC inlet temperature when the actual DOC inlet temperature deviates significantly from the DOC target temperature; adjusts the engine speed during parking regeneration; adjusts the combustion parameters in the parking regeneration thermal management mode; and coordinates and selects the appropriate regulation method based on the fuel economy and reliability of the vehicle during parking regeneration conditions.

[0090] The self-learning module stores the engine or vehicle operating parameters after the current intelligent parking regeneration control. If it determines that the environmental factors of the vehicle are the same during two consecutive parking regenerations, it will quickly adjust the engine or vehicle operating parameters to make T4 reach the target temperature, completing the parking regeneration control quickly and efficiently.

[0091] exist Figure 2 Based on the DPF parking regeneration control system shown, Figure 3 The second method flow chart of an embodiment of the DPF parking regeneration control method provided by the present invention is as follows: Figure 3 As shown in the figure, the basic principles of intelligent control of parking regeneration are as follows:

[0092] S301: The engine ECU monitors the operating status of the particulate filter (DPF) in real time and determines whether the vehicle requests parking regeneration based on its soot content. The judgment module reads the parking regeneration request status.

[0093] S302: When the ECU system detects a need for parked regeneration, the vehicle's instrument panel prompts the driver to press a button to initiate regeneration, or to proceed to a service station for service personnel to request parked regeneration using an external diagnostic tester. Certain operating conditions must be met before parked regeneration can be executed, such as vehicle speed, gear position, brake engagement, throttle position, coolant temperature, and exhaust gas temperature. Once the system detects that these conditions are met, parked regeneration is requested and the parked regeneration thermal management mode is entered.

[0094] S303: When the vehicle enters the parking regeneration mode, the engine speed rises to the set target high idle speed, and the combustion parameters are operated according to the basic calibration. The judgment module obtains the DOC inlet target temperature (T 4-target ), the judgment module calculates the deviation T between the actual DOC inlet temperature (T4) and the DOC inlet target temperature obtained by looking up the table in real time 4-error , by comparing T 4-error The maximum deviation from the calibrable value (T Error_MAX ) or minimum deviation (T Error_MIN ) to determine whether the current parking regeneration control needs to activate the closed-loop control module to perform T4 intelligent closed-loop temperature adjustment.

[0095] S304, when the judgment module detects that the deviation exceeds the maximum deviation (T Error_MAX ) or minimum deviation (T Error_MIN ) the closed-loop control module is activated and adjusts the actual DOC inlet temperature (T4) by intelligently adjusting the parking regeneration combustion parameters (such as air-fuel ratio, near-post injection amount, main injection timing, etc.) or adjusting the engine speed to make T 4-error At maximum deviation (T Error_MAX ) and minimum deviation (T Error_MIN ) and eventually stabilize.

[0096] S305, when the judgment module detects T 4-error At maximum deviation (T Error_MAX ) and minimum deviation (T Error_MIN ) and finally stabilizes, the ECU system enables the closed-loop control module to be disabled and stores the current parking regeneration combustion parameters or parking regeneration engine speed and other intelligent regeneration control parameters and the vehicle's current parking regeneration environmental factors (such as atmospheric pressure, ambient temperature, air conditioning status, etc.) in the self-learning module.

[0097] The vehicle maintains the current parked regeneration combustion parameters until the parked regeneration is completed and exits the parked regeneration thermal management mode.

[0098] When the judgment module detects that the vehicle has requested another parked regeneration, the self-learning module determines whether the current vehicle's parked regeneration environmental factors (such as atmospheric pressure, ambient temperature, and air conditioning status) are consistent with the parked regeneration environmental factors stored in the self-learning module during the previous parked regeneration. If they are consistent, the parked regeneration thermal management mode control directly assigns the previous parked regeneration combustion parameters and parked regeneration engine speed to quickly bring T4 within the target temperature range, completing the parked regeneration quickly and efficiently. If the vehicle environmental factors are determined to be inconsistent with the previous parked regeneration, steps S302, S303, S304, and S305 are repeated until the parked regeneration is complete.

[0099] Figure 4 A schematic diagram of the structure of an embodiment of the closed-loop control module provided by the present invention is shown as follows: Figure 4 As shown, the parking regeneration temperature closed-loop control module includes input signals, engine operation combustion parameter closed-loop adjustment module, engine operation condition closed-loop adjustment module, adjustment mode coordinator and output signals.

[0100] When the ECU system detects the parking regeneration request and executes the parking regeneration thermal management mode, the engine operation is controlled based on the initial combustion parameters. After the judgment module activates the closed-loop control module, the engine operating parameters are corrected and adjusted based on the DOC inlet temperature and the DOC inlet temperature target temperature deviation to achieve the ideal parking regeneration T4 temperature control.

[0101] Engine operation combustion parameter adjustment module: Engine operation combustion parameters mainly include main injection timing correction, near post injection amount correction and target air-fuel ratio correction, etc.

[0102] Main injection timing correction: increase or decrease the basic main injection timing parameters according to a certain step size or a certain proportion.

[0103] Correction of the amount of fuel injected after the fuel injection: increase or decrease the basic amount of fuel injected after the fuel injection by a certain proportion.

[0104] Target air-fuel ratio correction: increase or decrease the target air-fuel ratio parameter by a certain step size or a certain ratio.

[0105] The above engine combustion parameter corrections are all set with upper and lower limits. The upper and lower limits of each adjustment target parameter can be confirmed and calibrated based on the test bench. The confirmation boundaries include factors such as smoke density, HC leakage, combustion stability, and fuel economy.

[0106] Engine operating condition adjustment module: Engine operating condition adjustment mainly includes parking regeneration engine speed adjustment and parking regeneration engine load adjustment (such as fan speed).

[0107] When the deviation between the actual DOC inlet temperature and the DOC inlet target temperature is greater than the maximum deviation, that is, T 4-error >T Error_MAX , the actual DOC inlet temperature can be reduced by reducing the engine speed (e.g., in steps of 100 rpm) or reducing the engine load (reducing the fan speed or disengaging the fan).

[0108] When the deviation (negative deviation) of the actual DOC inlet temperature from the DOC inlet target temperature is less than the minimum deviation (negative deviation), that is, T 4-error <T Error_MIN, the actual DOC inlet temperature can be increased by increasing the engine speed (e.g., in steps of 100 rpm) or increasing the engine load (fully engaging the fan or increasing the fan speed).

[0109] Adjustment mode coordinator: When the closed-loop control module is activated, the system determines the deviation between the actual DOC inlet temperature and the DOC inlet target temperature T 4-error Too large or too small, so as to choose the adjustment direction (heating up, cooling down).

[0110] Figure 5 This is a schematic diagram of the parking regeneration intelligent adjustment mode coordinator provided by the present invention, as shown in FIG. Figure 5 As shown, after selecting an adjustment direction, the engine operating parameters are adjusted in the order (1, 2, 3, 4, 5) according to the corresponding adjustment target. If the current operating parameters overshoot (temperature rise exceeds the target or temperature drop is too low) after adjustment, the current adjustment target parameter is restored to the previous value and the next step is continued. This process is repeated to complete all intelligent adjustment controls. If the current adjustment meets the target requirements, the current engine operating parameters are stored in the self-learning module and the closed-loop control module is exited. The current engine operating parameters are maintained until the parking regeneration ends.

[0111] If it is too large, it is T 4-error >T Error_MAX , then press Figure 5 Adjustments are made through steps 1, 2, 3, 4, and 5 as shown. Specifically, the adjustments involve reducing engine speed (in 100-rpm increments), reducing engine load (disengaging the fan or reducing fan speed), increasing the target air-fuel ratio (increased by specific increments or by a specific proportional factor), reducing the near-end injection amount (decreased by a specific proportional factor), and increasing the main injection timing (increased by specific increments). If, after completing all of the above adjustments, the actual DOC inlet temperature and the DOC inlet target temperature still do not meet the target requirements, and the DOC inlet temperature remains elevated for an extended period, complete parked regeneration and then perform a diagnostic test on the vehicle.

[0112] If it is too small, T 4-error <T Error_MIN , then press Figure 5Adjustments are made in steps 1, 2, 3, 4, and 5, as shown. Specifically, the adjustment method involves increasing the engine speed by 100 rpm (with a calibrable upper limit), increasing the engine load, reducing the target air-fuel ratio, increasing the near-post injection amount, and increasing the main injection timing. During the target air-fuel ratio reduction adjustment process, the minimum throttle opening is limited to ensure the reliability of key engine components (this can be achieved through closed-loop control using minimum intake manifold pressure, with different limits set for different altitudes). Furthermore, when the NOx sensor signal is valid, the minimum oxygen concentration at the DOC inlet is measured (to ensure sufficient combustion and heat release of unburned fuel in the DOC) to limit the correction coefficients for combustion parameters such as the air-fuel ratio, main injection timing, and near-post injection amount. If the DOC inlet oxygen concentration reaches the minimum limit, engine combustion parameter correction is terminated. When the NOx sensor is ready, the air-fuel ratio correction is limited by the minimum throttle opening to prevent excessively low oxygen concentrations and reduce the reliability of key engine components. If after all the above adjustments, the actual DOC inlet temperature and the DOC inlet target temperature still cannot meet the target requirements and the DOC inlet temperature remains at a low temperature for a long time, the parking regeneration condition will be exited to remind the driver to go to a service station for engine or vehicle diagnostic testing.

[0113] The DPF parking regeneration control method provided by the present invention is described in detail below with reference to specific embodiments.

[0114] Example 1:

[0115] S1. Signal input judgment. For the present invention, vehicle signal input needs to include the following signals: engine speed, engine load (IMEP), atmospheric pressure, ambient temperature, parking regeneration request signal, DOC inlet sensor measured temperature (T4), cycle injection amount, throttle opening, actual air-fuel ratio, required air-fuel ratio, NOx sensor status, oxygen concentration, air conditioning signal, fan speed or status, main injection timing, near-post injection amount, etc.

[0116] S2. When the judgment module detects the parking regeneration request and confirms that the vehicle has successfully entered the parking regeneration heat management mode, it obtains the DOC inlet target temperature by looking up the table based on the current ambient atmospheric pressure and ambient temperature of the vehicle.

[0117] S3. After the actual DOC inlet temperature is determined to be stable, it is compared with the DOC inlet target temperature to calculate the temperature deviation T between the two. 4-error .

[0118] S4. Compare T 4-error With T Error_MIN 、T Error_MAX size.

[0119] S5. If T Error_MIN ≤T 4-error ≤T Error_MAX, indicating that the actual DOC inlet temperature is basically the same as the target temperature, there is no need for intelligent adjustment and control of the DOC inlet temperature, and the self-learning module is not enabled. After the parking regeneration is completed, the parking regeneration thermal management mode is exited and the vehicle resumes normal driving.

[0120] S6, if T 4-error >T Error_MAX or T 4-error <T Error_MIN , then the intelligent control module enable signal is set to TRUE, and the engine operation combustion parameter adjustment and engine operation condition adjustment are adjusted in an orderly manner according to the adjustment mode coordinator instruction.

[0121] S7, if T 4-error >T Error_MAX , the adjustment mode coordinator determines that the adjustment direction is cooling.

[0122] S8, the adjustment mode coordinator enters the first level of adjustment: engine speed adjustment. Reduce the engine speed by 100rpm and evaluate the temperature adjustment rate δT and temperature deviation T in real time. 4-error .

[0123] S9, if δT continues to increase or stabilizes T 4-error <T Error_MIN , the current adjustment is judged to be inapplicable, and the engine operating parameters are restored to the initial value state. Enter the next level adjustment mode.

[0124] S10, if δT is constant or very small and T 4-error >T Error_MAX , the engine speed can be further reduced by 100rpm, and the maximum reduction in engine speed cannot be lower than the system calibration limit.

[0125] S11, if T is monitored during the current adjustment process Error_MIN ≤T 4-error ≤T Error_MAX , then exit the closed-loop control module, the self-learning module enables the storage of the currently adjusted engine operating parameters, and the vehicle maintains the current operating parameters for parking regeneration.

[0126] S12, if the engine speed drops to the minimum limit and T 4-error >T Error_MAX The current engine speed is maintained and the next level of adjustment mode is entered.

[0127] S13, enter the second level of regulation: engine load regulation. The system monitors the fan speed or whether the fan is engaged.

[0128] S14. If the fan is in the disengaged state, skip this adjustment step and go to step 3: air-fuel ratio correction.

[0129] S15. If the system detects that the fan is in working state, the fan is disconnected and the temperature adjustment rate δT and temperature deviation T are monitored in real time. 4-error .

[0130] S16. Repeat steps S4 and S11.

[0131] S17. If the current 1st and 2nd level adjustments cannot achieve the target, enter the 3rd level adjustment: air-fuel ratio correction.

[0132] S18, air-fuel ratio correction: Increase the required air-fuel ratio by a fixed step size or amplify the required air-fuel ratio by a fixed ratio based on the basic required air-fuel ratio base value. Increase the throttle opening through air-fuel ratio closed-loop control to increase the fresh air intake volume to achieve the purpose of reducing exhaust temperature.

[0133] S19. Repeat steps S4 and S11.

[0134] S20. For cooling adjustment, the above steps are generally sufficient, and there is no need to adjust engine combustion parameters such as main injection timing and near-post injection amount. If the exhaust temperature is still high, it is necessary to diagnose and check the vehicle status.

[0135] Example 2:

[0136] S1. Signal input judgment. For the present invention, vehicle signal input needs to include the following signals: engine speed, engine load (IMEP), atmospheric pressure, ambient temperature, parking regeneration request signal, DOC inlet sensor measured temperature (T4), cycle injection amount, throttle opening, actual air-fuel ratio, required air-fuel ratio, NOx sensor status, oxygen concentration, air conditioning signal, fan speed or status, main injection timing, near-post injection amount, etc.

[0137] S2. When the judgment module detects the parking regeneration request and confirms that the vehicle has successfully entered the parking regeneration heat management mode, it obtains the DOC inlet target temperature by looking up the table based on the current ambient atmospheric pressure and ambient temperature of the vehicle.

[0138] S3. After the actual DOC inlet temperature is determined to be stable, it is compared with the DOC inlet target temperature to calculate the temperature deviation T between the two. 4-error .

[0139] S4. Compare T 4-error With T Error_MIN 、T Error_MAX size.

[0140] S5. If T Error_MIN ≤T 4-error ≤T Error_MAX, indicating that the actual DOC inlet temperature is basically the same as the target temperature, there is no need for intelligent adjustment and control of the DOC inlet temperature, and the self-learning module is not enabled. After the parking regeneration is completed, the parking regeneration thermal management mode is exited and the vehicle resumes normal driving.

[0141] S6, if T 4-error >T Error_MAX or T 4-error <T Error_MIN , then the intelligent control module enable signal is set to TRUE, and the engine operation combustion parameter adjustment and engine operation condition adjustment are adjusted in an orderly manner according to the adjustment mode coordinator instruction.

[0142] S7, if T 4-error <T Error_MIN , the adjustment mode coordinator determines that the adjustment direction is heating.

[0143] S8, enter the first level of regulation: engine load regulation. The system monitors the fan speed or whether the fan is engaged.

[0144] S9. If the fan is in the disengaged state or the fan speed is low, the fan is engaged or the fan speed is increased to full engagement. Real-time evaluation of the temperature adjustment rate δT and the temperature deviation T 4-error .

[0145] S10, if T is monitored during the current adjustment process Error_MIN ≤T 4-error ≤T Error_MAX , then exit the closed-loop control module, the self-learning module enables the storage of the currently adjusted engine operating parameters, and the vehicle maintains the current operating parameters for parking regeneration.

[0146] S11. If δT continues to decrease or does not change and stabilizes, T 4-error <T Error_MIN If the current adjustment cannot meet the demand, the engine operating parameters will remain at the current state and the system will enter the next adjustment mode.

[0147] S12, the adjustment mode coordinator enters the second level of adjustment: engine speed adjustment. Increase the engine speed by 100rpm, and the maximum increase cannot exceed the set maximum limit. Real-time evaluation of the temperature adjustment rate δT and temperature deviation T 4-error .

[0148] S13, if δT rises quickly and stabilizes, T 4-error >T Error_MIN , then exit the closed-loop control module, the self-learning module enables the storage of the currently adjusted engine operating parameters, and the vehicle maintains the current operating parameters for parking regeneration.

[0149] S14, if δT rises slowly or remains constant and stable, T4-error <T Error_MIN , it is determined that the current adjustment still cannot meet the target requirements, the engine operating parameters remain in the current state and enter the next level adjustment mode.

[0150] S15. Enter the third level adjustment mode: air-fuel ratio correction.

[0151] S16: Reduce the required air-fuel ratio by a fixed step size or a fixed ratio based on the basic required air-fuel ratio value, reduce the throttle opening through air-fuel ratio closed-loop control, and reduce the amount of fresh air intake to achieve the purpose of increasing the exhaust temperature.

[0152] S17. Repeat steps S4, S10 and S11.

[0153] S18, enter the 4th level adjustment mode: close back spray correction.

[0154] S19: Increase the near-end fuel injection amount by a fixed ratio based on the basic near-end fuel injection amount. The maximum correction amount cannot exceed the set limit.

[0155] S20. Repeat steps S4, S10, and S11.

[0156] S21. Enter the fifth level adjustment mode: close back spray correction.

[0157] S22: The main injection timing is reduced by a fixed amount based on the basic near-rear injection amount. The maximum correction amount cannot exceed the set limit.

[0158] S23. If the exhaust temperature is still high after multiple stages, it is necessary to diagnose the vehicle status.

[0159] This invention builds upon the traditional parked regeneration thermal management model by adding a closed-loop control module based on the DOC inlet temperature (T4). This design aims to rapidly increase the DOC inlet temperature (T4) based on engine operating parameters and ultimately stabilize it within a set target range after a vehicle enters parked regeneration thermal management mode upon request. This ensures that unburned HC entering the DOC can be efficiently and rapidly oxidized and released to combust and eliminate soot trapped within the DPF. A high and stable DOC inlet temperature (T4) is crucial for high DPF regeneration efficiency and high-quality regeneration temperature control. Furthermore, the DOC inlet temperature (T4) closed-loop control model adjusts the parked regeneration thermal management combustion parameters, engine speed, and load in real time for different vehicles and operating environments. This ensures high consistency in parked regeneration temperature and efficiency across different operating environments, reducing the risk of unsuccessful or inefficient parked regeneration and optimizing fuel economy during parked regeneration. Finally, this invention significantly reduces the effort required to optimize and calibrate the parked regeneration thermal management model during vehicle testing and development, effectively shortening the testing and development cycle in high-temperature, high-altitude, and cold environments and reducing testing and development costs.

[0160] The DPF parking regeneration control method provided by the embodiment of the present invention has the following advantages:

[0161] 1. The parking regeneration heat management mode introduces different DOC inlet target temperatures under different vehicle environments, and implements closed-loop control of the DOC inlet temperature with the deviation between the DOC inlet temperature and the target temperature as the target, so as to achieve consistency in the parking regeneration control of the vehicle when the vehicle is in the same environment.

[0162] 2. The intelligent closed-loop control adjustment method for parking regeneration adds an adjustment method coordinator to perform differentiated adjustments for temperature increase or decrease. The adjustment direction includes engine operating combustion parameters (mainly air-fuel ratio, main injection timing, near-post injection amount, etc.) and engine operating condition adjustment (speed, load), but is not limited to the above adjustment methods.

[0163] 3. The parking regeneration intelligent control self-learning module can realize the parking regeneration DOC inlet temperature control to quickly reach the target temperature for the same vehicle under the same environment through the self-learning module, greatly reducing the closed-loop control adjustment process.

[0164] In order to better implement the DPF parking regeneration control method in the embodiment of the present invention, based on the DPF parking regeneration control method, the embodiment of the present invention further provides a DPF parking regeneration control device. Figure 6 This is a structural diagram of an embodiment of the DPF parking regeneration control device provided by the present invention, as shown in FIG. Figure 6 As shown, the DPF parking regeneration control device 600 includes:

[0165] an acquisition module 610 for acquiring a temperature deviation between an inlet temperature of the DOC and a target temperature upon receiving a parking regeneration request;

[0166] an adjusting module 620 for adjusting the inlet temperature based on combustion parameters and operating parameters of the engine when the temperature deviation is outside a preset range;

[0167] The control module 630 is configured to control the vehicle to perform parking regeneration until the temperature deviation is within the preset range.

[0168] The DPF parking regeneration control device 600 provided in the above embodiment can implement the technical solution described in the above DPF parking regeneration control method embodiment. The specific implementation principles of the above modules or units can be found in the corresponding content of the DPF parking regeneration control method embodiment, which will not be repeated here.

[0169] like Figure 7 As shown, the present invention also provides an electronic device 700. The electronic device 700 includes a processor 701, a memory 702 and a display 703. Figure 7 Only some of the components of the electronic device 700 are shown, but it should be understood that it is not required to implement all of the shown components, and more or fewer components may be implemented instead.

[0170] In some embodiments, the processor 701 may be a central processing unit (CPU), a microprocessor, or other data processing chip, configured to execute program codes or process data stored in the memory 702 , such as the DPF parking regeneration control method of the present invention.

[0171] In some embodiments, the processor 701 may be a single server or a server group. The server group may be centralized or distributed. In some embodiments, the processor 701 may be local or remote. In some embodiments, the processor 701 may be implemented on a cloud platform. In some embodiments, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, multiple clouds, or any combination thereof.

[0172] In some embodiments, the memory 702 may be an internal storage unit of the electronic device 700, such as a hard disk or memory of the electronic device 700. In other embodiments, the memory 702 may also be an external storage device of the electronic device 700, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 700.

[0173] Furthermore, the memory 702 may include both an internal storage unit of the electronic device 700 and an external storage device. The memory 702 is used to store application software installed in the electronic device 700 and various data.

[0174] In some embodiments, display 703 can be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an organic light-emitting diode (OLED) touchscreen. Display 703 is used to display information on electronic device 700 and to display a visual user interface. Components 701-703 of electronic device 700 communicate with each other via a system bus.

[0175] In one embodiment, when the processor 701 executes the DPF parking regeneration control program in the memory 702, the following steps may be implemented:

[0176] Upon receiving a parking regeneration request, obtaining a temperature deviation between a DOC inlet temperature and a target temperature;

[0177] When the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine;

[0178] When the temperature deviation is within the preset range, the vehicle is controlled to perform parking regeneration.

[0179] It should be understood that, when the processor 701 executes the DPF parking regeneration control program in the memory 702 , in addition to the above functions, it can also implement other functions. For details, please refer to the description of the corresponding method embodiment above.

[0180] Furthermore, the embodiment of the present invention does not specifically limit the type of the electronic device 700 mentioned. The electronic device 700 may be a portable electronic device such as a mobile phone, a tablet computer, a personal digital assistant (PDA), a wearable device, a laptop computer, or the like. Exemplary embodiments of portable electronic devices include but are not limited to portable electronic devices equipped with iOS, Android, Microsoft, or other operating systems. The above-mentioned portable electronic devices may also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the present invention, the electronic device 700 may not be a portable electronic device, but a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0181] Accordingly, an embodiment of the present invention further provides a computer-readable storage medium, which is used to store computer-readable programs or instructions. When the program or instructions are executed by a processor, the steps or functions of the DPF parking regeneration control method provided in the above-mentioned method embodiments can be implemented.

[0182] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the steps or functions in the DPF parking regeneration control method provided in the above-mentioned method embodiments.

[0183] Those skilled in the art will appreciate that all or part of the process flow of the above-described method embodiment can be implemented by instructing related hardware (such as a processor, controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0184] The DPF parking regeneration control method, device, electronic device and storage medium provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A DPF parking regeneration control method, characterized in that: include: Upon receiving a parking regeneration request, obtaining a temperature deviation between a DOC inlet temperature and a target temperature; When the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine; When the temperature deviation is within the preset range, controlling the vehicle to perform parking regeneration; The combustion parameters include: target air-fuel ratio, post-injection fuel quantity and main injection timing; The operating parameters include: engine speed and engine load; When the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine includes: When the temperature deviation is greater than the maximum value within the preset range, the following operations are performed in sequence to adjust the inlet temperature: Reduce engine speed, reduce engine load, increase target air-fuel ratio, reduce post-injection fuel quantity and increase main injection timing; When the temperature deviation is outside a preset range, adjusting the inlet temperature based on combustion parameters and operating parameters of the engine includes: When the temperature deviation is less than the minimum value within the preset range, the following operations are performed in sequence to adjust the inlet temperature: Increase engine load, increase engine speed, reduce target air-fuel ratio, increase post-injection amount and reduce main injection timing.

2. The DPF parking regeneration control method according to claim 1, characterized in that: After controlling the vehicle to perform parking regeneration until the temperature deviation is within a preset range, the method further includes: storing combustion parameters and operating condition parameters corresponding to the temperature deviation; When the environmental factors of the vehicle during two adjacent parking regenerations are the same, the inlet temperature is adjusted based on the combustion parameters and operating condition parameters corresponding to the temperature deviation.

3. The DPF parking regeneration control method according to claim 1, characterized in that: Before obtaining the temperature deviation between the DOC inlet temperature and the target temperature when the parking regeneration request is received, the method further includes: The target temperature is determined based on the ambient atmospheric pressure and ambient temperature of the vehicle's current environment.

4. A DPF parking regeneration control device, implementing the DPF parking regeneration control method according to any one of claims 1 to 3, characterized in that: include: an acquisition module, configured to acquire a temperature deviation between an inlet temperature of the DOC and a target temperature upon receiving a parking regeneration request; an adjusting module, configured to adjust the inlet temperature based on combustion parameters and operating condition parameters of the engine when the temperature deviation is outside a preset range; The control module is configured to control the vehicle to perform parking regeneration until the temperature deviation is within the preset range.

5. An electronic device, characterized in that: comprising a memory and a processor, wherein, The memory is used to store programs; The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the DPF parking regeneration control method according to any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the DPF parking regeneration control method according to any one of claims 1 to 3 is implemented.

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