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

Abstract

The invention relates to a DPF parking regeneration control method and device, electronic equipment and a storage medium, and belongs to the technical field of vehicle control. The method comprises the steps that when a parking regeneration request is received, the temperature deviation value between the inlet temperature of a DOC and the target temperature is obtained; when the temperature deviation value is out of the preset range, the inlet temperature is adjusted based on combustion parameters and working condition parameters of the engine; and when the temperature deviation value is within the preset range, the vehicle is controlled to perform parking regeneration. According to the DPF parking regeneration control method, it can be guaranteed that the unburned HC entering the DOC can be efficiently and rapidly oxidized to release heat so as to burn and eliminate soot captured in the DPF, high consistency of the parking regeneration temperature and the regeneration efficiency of different vehicles in different operation environments can be achieved, and the risk that parking regeneration is not successful or the regeneration efficiency is low is reduced.

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. In order to meet the National VI emission regulations, an aftertreatment system must be added. Harmful particulate matter in the engine exhaust is captured and stored by the particulate filter. Its main component is soot, which can be burned in the diesel particulate filter (DPF) through passive regeneration and active regeneration to restore the normal function of the DPF. When the vehicle is running under a certain condition and more and more particulate matter is captured in the DPF, active regeneration is required to restore the normal function of the DPF. When the content of particulate matter captured in the DPF is higher than a certain threshold, in order to ensure the safety performance of the DPF carrier, the electronic control unit (ECU) system prohibits driving regeneration and requests parking regeneration to reduce the content of particulate matter in the DPF. The parking regeneration request can be requested by the driver to execute the parking regeneration with one button or the service station staff can request to enter the parking regeneration mode through an external diagnostic instrument. In traditional engine control, the DPF parking regeneration condition is set to a single high idle mode, and the regeneration heat management requirements are met by optimizing the combustion parameters.

[0003] The current parking regeneration condition setting is based on the engine test bench to simulate the high idle condition of the whole vehicle to calibrate the engine combustion parameters, so that the diesel catalytic oxidizer (DOC) inlet temperature reaches the target set temperature to meet the unburned hydrocarbons (HC) in the DOC to release heat and realize the combustion of carbon soot in the DPF. The combustion parameters of the parking regeneration condition are single and applied to the same model. The exhaust temperature deviation caused by factors such as vehicle production errors cannot be compensated and corrected. The parking regeneration heat management temperature varies greatly between different vehicles of the same model. At the same time, during the test development process, it is necessary to conduct field verification of the vehicle's parking regeneration condition in different environments (high temperature, plateau, high cold, etc.) and optimize the combustion parameters to meet the parking regeneration needs.

[0004] The existing parking regeneration combustion parameters are calibrated based 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 temperatures of the parking regeneration conditions vary 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: When a parking regeneration request is received, a temperature deviation between an inlet temperature of the DOC and a target temperature is obtained; 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, the vehicle is controlled to perform parking regeneration.

[0007] In a possible implementation, the combustion parameters include: target air-fuel ratio, post-injection amount and main injection timing; The operating parameters include: engine speed and engine load.

[0008] In a possible implementation, when the temperature deviation is outside a preset range, adjusting the inlet temperature based on a combustion parameter and an operating condition parameter 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 amount and increase main injection timing.

[0009] In a possible implementation, when the temperature deviation is outside a preset range, adjusting the inlet temperature based on a combustion parameter and an operating condition parameter 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.

[0010] In a possible implementation, after the step of controlling the vehicle to perform parking regeneration until the temperature deviation is within the 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 the operating condition parameters corresponding to the temperature deviation.

[0011] In a possible implementation, before obtaining the temperature deviation between the inlet temperature of the DOC 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.

[0012] The present invention also provides a DPF parking regeneration control device, comprising: An acquisition module, for acquiring a temperature deviation between an inlet temperature of the DOC and a target temperature when a parking regeneration request is received; A regulating module, configured to regulate 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 used to control the vehicle to perform parking regeneration until the temperature deviation is within the preset range.

[0013] On the other hand, the present invention also provides an electronic device, including a memory and a processor, wherein: The memory is used to store programs; The processor is coupled to the memory and is used to execute the program stored in the memory to implement the DPF parking regeneration control method described in any of the above implementations.

[0014] On the other hand, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the DPF parking regeneration control method described in any of the above implementations.

[0015] 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.

[0016] 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 inlet temperature of the DOC and the target temperature when receiving a parking regeneration request. When the temperature deviation is outside the preset range, the inlet temperature of the DOC can be quickly adjusted by adjusting the combustion parameters and operating parameters of the engine, 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. The parking regeneration temperature and regeneration efficiency can be highly consistent under different operating environments of different vehicles, thereby reducing the risk of unsuccessful parking regeneration or low regeneration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. 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.

[0018] Figure 1 One of the method flow charts of an embodiment of the DPF parking regeneration control method provided by the present invention; Figure 2 A schematic structural diagram of an embodiment of a DPF parking regeneration control system provided by the present invention; Figure 3 A second method flow chart of an embodiment of a DPF parking regeneration control method provided by the present invention; Figure 4 A schematic diagram of the structure of an embodiment of a closed-loop control module provided by the present invention; Figure 5 A schematic diagram of a parking regeneration intelligent adjustment mode coordinator provided by the present invention; Figure 6 A schematic structural diagram of an embodiment of a DPF parking regeneration control device provided by the present invention; Figure 7 A schematic structural diagram of an embodiment of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] In the description of the embodiments of the present invention, unless otherwise specified, "multiple" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" may mean: A exists alone, A and B exist at the same time, and B exists alone.

[0021] The descriptions of "first", "second", etc. involved in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the technical features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0022] Figure 1One of the method flow charts of an embodiment of the DPF parking regeneration control method provided by the present invention is as follows Figure 1 As shown, the DPF parking regeneration control method includes: S101, when receiving a parking regeneration request, obtaining a temperature deviation between an inlet temperature of a DOC and a target temperature; S102, when the temperature deviation is outside a preset range, adjusting the inlet temperature based on the combustion parameters and operating parameters of the engine; S103: until the temperature deviation is within the preset range, control the vehicle to perform parking regeneration.

[0023] 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.

[0024] 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 inlet temperature of the DOC and the target temperature when a parking regeneration request is received. When the temperature deviation is outside the preset range, the inlet temperature of the DOC can be quickly adjusted by adjusting the combustion parameters and operating parameters of the engine, 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. The parking regeneration temperature and regeneration efficiency can be highly consistent under different operating environments of different vehicles, thereby reducing the risk of unsuccessful parking regeneration or low regeneration efficiency.

[0025] In some embodiments of the present invention, the combustion parameters include: target air-fuel ratio, post-injection amount and main injection timing; The operating parameters include: engine speed and engine load.

[0026] The target air-fuel ratio refers to the ratio of air to fuel mass in the mixture. During the DPF regeneration process, the combustion efficiency can be optimized by adjusting the air-fuel ratio, which in turn affects the exhaust temperature. A lower air-fuel ratio will increase the exhaust temperature and help the combustion of carbon particles.

[0027] The amount of post-injection refers to the amount of additional fuel injected after the main injection, which is used to increase the exhaust temperature and promote the combustion of carbon particles in the DPF. By increasing the amount of post-injection, the exhaust temperature can be directly increased, thereby accelerating the regeneration process of the DPF.

[0028] Main injection timing refers to the timing of the main fuel injection, usually expressed in crankshaft angle. Adjusting the main injection timing can affect the start time and efficiency of combustion, thereby indirectly adjusting the exhaust temperature. Proper main injection timing can ensure that the fuel is burned at the best time, which not only ensures power output but also supports effective regeneration of the DPF.

[0029] Engine speed refers to the number of revolutions per minute of the engine, which is directly related to the engine's operating status and exhaust flow. Increasing the engine speed will increase exhaust flow and temperature, which is beneficial to increase the DOC inlet temperature, thereby accelerating DPF regeneration.

[0030] The engine load reflects the current power output state of the engine and is closely related to the fuel injection amount and throttle opening. Increasing the engine load will increase the fuel supply accordingly, thereby increasing the exhaust temperature, which is used to quickly reach the required temperature during DPF regeneration.

[0031] 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: 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 amount and increase main injection timing.

[0032] Exemplarily, 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 .

[0033] Temperature deviation (T 4-error ) is the DOC inlet temperature (T4) and the target temperature (T 4-target ) is the difference between .

[0034] 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).

[0035] Specifically, T 4-error >T Error_MAX The following operations are performed in sequence for adjustment: reduce engine speed (reduce in steps of 100rpm), reduce engine load (disconnect the fan or reduce fan speed), increase 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).

[0036] If the actual DOC inlet temperature and the DOC inlet target temperature still cannot reach 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 the parking regeneration is completed.

[0037] The DPF parking regeneration control method provided by the embodiment of the present invention can ensure that the exhaust temperature can be maintained within a suitable range during the DPF parking regeneration process, thereby ensuring the effective regeneration of particulate matter and avoiding damage to the DPF. By accurately controlling the operating parameters of the engine, the exhaust temperature can be accurately adjusted, thereby achieving the purpose of efficient and safe regeneration.

[0038] 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: 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.

[0039] 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).

[0040] Specifically, T 4-error <T Error_MIN The following operations are performed in sequence for adjustment: increase engine load, increase engine speed by 100rpm (the upper limit can be calibrated), reduce target air-fuel ratio, increase near-rear injection amount, and reduce main injection timing.

[0041] In the process of lowering the target air-fuel ratio, in order to consider the reliability of key engine components, it is necessary to limit the minimum throttle opening (closed-loop control can be achieved by minimizing the intake manifold pressure, and different limits can be set at different altitudes).

[0042] At the same time, when the NOx sensor signal is valid, the correction ratio coefficient of combustion parameters such as air-fuel ratio, main injection timing and near-post injection amount is limited by measuring the minimum oxygen concentration at the DOC inlet (to ensure that the unburned fuel can be fully burned and released in the DOC). If the oxygen concentration at the DOC inlet reaches the minimum limit, the correction of engine combustion parameters is stopped. When the NOx sensor is ready, the air-fuel ratio correction can be limited by the minimum throttle opening to avoid too low oxygen concentration and reduce the reliability of key engine components.

[0043] If after all the above adjustments, the actual DOC inlet temperature and the DOC inlet target temperature still cannot reach the target requirement 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.

[0044] The DPF parking regeneration control method provided by the embodiment of the present invention can ensure that the exhaust temperature can be maintained within a suitable range during the DPF parking regeneration process, thereby ensuring the effective regeneration of particulate matter and avoiding damage to the DPF. By accurately controlling the operating parameters of the engine, the exhaust temperature can be accurately adjusted, thereby achieving the purpose of efficient and safe regeneration.

[0045] In some embodiments of the present invention, after the temperature deviation is within the preset range and the vehicle is controlled to perform parking regeneration, 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 the operating condition parameters corresponding to the temperature deviation.

[0046] When it is monitored that the vehicle receives a parking regeneration request again, it is determined whether the current parking regeneration environmental factors of the vehicle (such as atmospheric pressure, ambient temperature, air conditioning status, etc.) are consistent with the parking regeneration environmental factors stored during the last parking regeneration.

[0047] 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 last parking regeneration, thereby completing the parking regeneration quickly and efficiently.

[0048] 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.

[0049] 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 of the vehicle under the same environment, thereby greatly reducing the closed-loop control adjustment process.

[0050] In some embodiments of the present invention, before obtaining the temperature deviation between the inlet temperature of the DOC and the target temperature when receiving the parking regeneration request, the method further includes: The target temperature is determined based on the ambient atmospheric pressure and ambient temperature of the vehicle's current environment.

[0051] 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, and the table may be obtained by pre-calibration.

[0052] After judging that the actual DOC inlet temperature is stable, compare it with the DOC inlet target temperature and calculate the temperature deviation T between the two. 4-error .

[0053] 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 vehicles are in the same environment.

[0054] In addition, the present invention provides a DPF parking regeneration control system, Figure 2 FIG. 1 is a structural diagram of an embodiment of a 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.

[0055] 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 the activation 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 last parking regeneration environmental factors.

[0056] The closed-loop control module performs closed-loop regulation of the DOC inlet temperature when the actual DOC inlet temperature deviates greatly from the DOC target temperature; adjusts the parking regeneration engine speed; adjusts the parking regeneration thermal management mode combustion parameters; and coordinates and selects the appropriate regulation method based on the fuel economy and reliability of the vehicle's parking regeneration conditions.

[0057] The self-learning module stores the engine or vehicle operating parameters after the current parking regeneration intelligent control; when it is determined that the environmental factors of the vehicle are the same when two consecutive parking regenerations occur, the engine or vehicle operating parameters are quickly adjusted to make T4 reach the target temperature, and the parking regeneration control is completed quickly and efficiently.

[0058] 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 principle of intelligent control of parking regeneration is as follows: S301, the engine ECU monitors the operating status of the particulate filter (DPF) in real time, determines whether the vehicle requests parking regeneration based on its soot content, and the judgment module reads the parking regeneration request status.

[0059] S302: When the ECU system detects that parking regeneration needs to be requested, the vehicle instrument will prompt the driver to press a button to regenerate or go to a service station for service personnel to request parking regeneration through an external diagnostic instrument. Of course, before executing parking regeneration, the vehicle needs to meet certain operating conditions, such as vehicle speed, gear position, brake signal, throttle position, coolant temperature, exhaust temperature, etc. When the system detects that the required conditions are met, it can request parking regeneration and enter the parking regeneration thermal management mode.

[0060] 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 in real time the deviation T between the actual DOC inlet temperature (T4) and the DOC inlet target temperature obtained by looking up the table 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.

[0061] 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.

[0062] S305, when the judgment module detects T 4-error At maximum deviation (T Error_MAX ) and minimum deviation (T Error_MIN ) and finally stabilize, the ECU system enables the closed-loop control module to fail 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.

[0063] The vehicle maintains the current parking regeneration combustion parameters until the parking regeneration is completed and exits the parking regeneration heat management mode.

[0064] When the judgment module detects that the vehicle makes another parking regeneration request, the self-learning module determines 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 in the self-learning module of the last parking regeneration. If it is determined to be consistent, the parking regeneration thermal management mode control directly assigns the last parking regeneration combustion parameters and parking regeneration engine speed, so that T4 quickly reaches the target temperature range and the parking regeneration is completed quickly and efficiently. If it is determined that the vehicle environmental factors are inconsistent with the last parking regeneration, steps S302, S303, S304 and S305 are repeated again until the parking regeneration is completed.

[0065] Figure 4 A schematic diagram of the structure of an embodiment of a closed-loop control module provided by the present invention is shown in FIG. Figure 4 As shown, the parking regeneration temperature closed-loop control module includes input signals, an engine operation combustion parameter closed-loop adjustment module, an engine operation condition closed-loop adjustment module, an adjustment mode coordinator, and output signals.

[0066] 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, and the engine initial combustion parameters or engine operating conditions are corrected and adjusted, ultimately achieving the ideal parking regeneration T4 temperature control.

[0067] Engine operation combustion parameter adjustment module: The engine operation combustion parameters mainly include main injection timing correction, post-injection fuel amount correction and target air-fuel ratio correction, etc., but are not limited to these.

[0068] Main injection timing correction: increase or decrease the basic main injection timing parameters according to a certain step length or a certain proportion.

[0069] 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.

[0070] Target air-fuel ratio correction: increase or decrease the target air-fuel ratio parameter in a certain step or proportion.

[0071] 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.

[0072] 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).

[0073] When the actual DOC inlet temperature deviates from the DOC inlet target temperature by more 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).

[0074] 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).

[0075] 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).

[0076] Figure 5 A schematic diagram of the parking regeneration intelligent adjustment mode coordinator provided by the present invention, such as Figure 5 As shown, after selecting the adjustment direction, adjust the engine operating parameters in sequence (1, 2, 3, 4, 5) according to the adjustment target of the corresponding direction. If the current operating parameters are over-adjusted (temperature rise exceeds the target or temperature drop is too low) after adjustment, the current adjustment target parameter will be restored to the previous value and jump to the next step to continue adjustment. All intelligent adjustment controls are completed by analogy. If the target requirements are met after the current adjustment, the current engine operating parameters are stored in the self-learning module and the closed-loop control module is exited, and the current engine operating parameters are maintained until the parking regeneration ends.

[0077] If it is too large, it is T 4-error >T Error_MAX , then press Figure 5 The adjustment is carried out according to the steps 1, 2, 3, 4, and 5 shown in the figure. The specific adjustment methods are engine speed reduction (reduction by 100rpm steps), engine load reduction (disconnecting the fan or reducing the fan speed), increasing the target air-fuel ratio (increasing by a certain step or increasing by a certain proportional coefficient), reducing the near-rear injection amount (reducing by a certain proportional coefficient), and increasing the main injection timing (increasing by a certain step). 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 the parking regeneration is completed.

[0078] If it is too small, T 4-error <T Error_MIN , then press Figure 5The adjustment is carried out according to the steps 1, 2, 3, 4, and 5 shown in the figure. The specific adjustment method is to increase the engine speed by 100rpm (the upper limit can be calibrated), increase the engine load, reduce the target air-fuel ratio, increase the near-end injection amount, and increase the main injection timing. In the process of reducing the target air-fuel ratio, in order to consider the reliability of key engine components, it is necessary to limit the minimum throttle opening (which can be closed-loop controlled by the minimum intake manifold pressure, and different limits can be set at different altitudes). At the same time, when the NOx sensor signal is valid, the correction proportional coefficient of combustion parameters such as air-fuel ratio, main injection timing and near-end injection amount is limited by measuring the minimum oxygen concentration at the DOC inlet (to ensure that the unburned fuel can be fully burned and released in the DOC). If the oxygen concentration at the DOC inlet reaches the minimum limit, the correction of the engine combustion parameters is stopped. When the NOx sensor is ready, the air-fuel ratio correction can be limited by the minimum throttle opening to avoid too low oxygen concentration 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 reach the target requirement 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.

[0079] The DPF parking regeneration control method provided by the present invention is described in detail below in conjunction with specific embodiments.

[0080] Embodiment 1: S1. Signal input judgment. For the present invention, the 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 measurement 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-rear injection amount, etc.

[0081] S2. When the judgment module detects the parking regeneration request and confirms that the vehicle has successfully entered the parking regeneration heat management mode, the DOC inlet target temperature is obtained by looking up the table of the current ambient atmospheric pressure and ambient temperature of the vehicle.

[0082] S3. After judging that the actual temperature of the DOC inlet is stable, compare it with the target temperature of the DOC inlet and calculate the temperature deviation T between the two. 4-error .

[0083] S4. Compare T 4-error With T Error_MIN , T Error_MAX size.

[0084] S5. If T Error_MIN ≤T 4-error ≤T Error_MAX, it indicates that the actual DOC inlet temperature is basically consistent with the target temperature, and there is no need to intelligently adjust and control the DOC inlet temperature, and the self-learning module is not enabled. After completing the parking regeneration, exit the parking regeneration heat management mode and the vehicle resumes normal driving.

[0085] 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 instructions.

[0086] S7, if T 4-error >T Error_MAX , the adjustment mode coordinator determines that the adjustment direction is cooling.

[0087] 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 .

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] S13, enter the second level of regulation: engine load regulation. The system monitors the fan speed or whether the fan is engaged.

[0093] S14. If the fan is in the disengaged state, skip this adjustment step and go to step 3: air-fuel ratio correction.

[0094] 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 .

[0095] S16. Repeat steps S4 and S11.

[0096] S17. If the current 1st and 2nd level adjustments cannot achieve the target, enter the 3rd level adjustment: air-fuel ratio correction.

[0097] 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 on the basis of the basic required air-fuel ratio, increase the throttle opening through air-fuel ratio closed-loop control, and increase the amount of fresh air intake to achieve the purpose of reducing the exhaust temperature.

[0098] S19. Repeat steps S4 and S11.

[0099] S20. For cooling adjustment, the above steps are generally sufficient, and there is no need to adjust the main injection timing, near-rear injection amount and other engine combustion parameters. If the exhaust temperature is still very high, it is necessary to diagnose and check the vehicle status.

[0100] Embodiment 2: S1. Signal input judgment. For the present invention, the 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 measurement 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-rear injection amount, etc.

[0101] S2. When the judgment module detects the parking regeneration request and confirms that the vehicle has successfully entered the parking regeneration heat management mode, the DOC inlet target temperature is obtained by looking up the table of the current ambient atmospheric pressure and ambient temperature of the vehicle.

[0102] S3. After judging that the actual temperature of the DOC inlet is stable, compare it with the target temperature of the DOC inlet and calculate the temperature deviation T between the two. 4-error .

[0103] S4. Compare T 4-error With T Error_MIN , T Error_MAX size.

[0104] S5. If T Error_MIN ≤T 4-error ≤T Error_MAX, it indicates that the actual DOC inlet temperature is basically consistent with the target temperature, and there is no need to intelligently adjust and control the DOC inlet temperature, and the self-learning module is not enabled. After completing the parking regeneration, exit the parking regeneration heat management mode and the vehicle resumes normal driving.

[0105] 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 instructions.

[0106] S7, if T 4-error <T Error_MIN , the adjustment mode coordinator determines that the adjustment direction is heating.

[0107] S8, enter the first level of regulation: engine load regulation. The system monitors the fan speed or whether the fan is engaged.

[0108] 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 .

[0109] S10, if T is detected 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.

[0110] S11. If δT continues to decrease or remains unchanged and stabilizes, T 4-error <T Error_MIN , it is determined that the current adjustment cannot meet the demand, and the engine operating parameters remain in the current state. The system enters the next level of adjustment mode.

[0111] 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 temperature adjustment rate δT and temperature deviation T 4-error .

[0112] 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.

[0113] S14, if δT rises slowly or remains constant and stabilizes, T4-error <T Error_MIN , it is judged that the current adjustment still cannot meet the target demand, then the engine operating parameters remain in the current state and enter the next level adjustment mode.

[0114] S15. Enter the third level adjustment mode: air-fuel ratio correction.

[0115] S16, reducing the required air-fuel ratio by a fixed step size or a fixed ratio on the basis of the basic required air-fuel ratio, reducing the throttle opening through air-fuel ratio closed-loop control, and reducing the amount of fresh intake air to achieve the purpose of increasing the exhaust temperature.

[0116] S17. Repeat steps S4, S10 and S11.

[0117] S18, enter the 4th level adjustment mode: near rear spray correction.

[0118] S19: Increase the amount of post-injection fuel at a fixed ratio based on the basic post-injection fuel amount. The maximum correction amount cannot exceed the set limit.

[0119] S20. Repeat steps S4, S10 and S11.

[0120] S21, enter the 5th level adjustment mode: close back spray correction.

[0121] 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.

[0122] S23. If the exhaust temperature is still very high after multiple stages, a diagnostic check of the vehicle status is required.

[0123] The present invention adds a closed-loop control module based on the DOC inlet temperature (T4) based on the traditional parking regeneration heat management mode, aiming to quickly increase the DOC inlet temperature (T4) according to the engine operating parameters after the vehicle executes the parking regeneration request and enters the parking regeneration heat management mode, and finally stabilize it within the set target range, so as to ensure that the unburned HC entering the DOC can be efficiently and quickly oxidized and release heat to burn and eliminate the carbon smoke captured in the DPF. A high and stable DOC inlet temperature (T4) is an important factor for the DPF to have a high regeneration efficiency and high-quality regeneration temperature control. At the same time, the parking regeneration heat management combustion parameters and the parking regeneration engine speed and load under different vehicle use environments are adjusted in real time through the DOC inlet temperature (T4) closed-loop control model, so that the parking regeneration temperature and regeneration efficiency under different operating environments of different vehicles can be highly consistent, reducing the risk of unsuccessful parking regeneration or low regeneration efficiency, and also realizing the optimization of fuel economy during parking regeneration. Finally, the invention also greatly reduces the optimization and calibration work of the parking regeneration heat management mode during vehicle test development, effectively shortens the test development cycle under high temperature, plateau and high cold environments, and reduces the test development cost.

[0124] The DPF parking regeneration control method provided by the embodiment of the present invention has the following advantages: 1. The parking regeneration heat management mode introduces different DOC inlet target temperatures under different vehicle 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 in the parking regeneration control of the vehicle when the vehicle is in the same environment.

[0125] 2. The parking regeneration intelligent closed-loop control adjustment method adds an adjustment method coordinator to perform differentiated adjustments to temperature rise or fall. The adjustment direction includes engine operation combustion parameters (mainly air-fuel ratio, main injection timing, near-rear injection amount, etc.) and engine operating condition adjustment (speed, load), but is not limited to the above adjustment methods.

[0126] 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.

[0127] 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 FIG. 1 is a schematic structural diagram of an embodiment of a 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: An acquisition module 610 is used to acquire a temperature deviation between an inlet temperature of the DOC and a target temperature when a parking regeneration request is received; An adjustment module 620, configured to adjust the inlet temperature based on combustion parameters and operating parameters of the engine when the temperature deviation is outside a preset range; The control module 630 is configured to control the vehicle to perform parking regeneration until the temperature deviation is within the preset range.

[0128] 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 refer to the corresponding contents in the DPF parking regeneration control method embodiment, which will not be repeated here.

[0129] 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 components of the electronic device 700 are shown, but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead.

[0130] In some embodiments, the processor 701 may be a central processing unit (CPU), a microprocessor or other data processing chip, which is used to run the program code or process data stored in the memory 702, such as the DPF parking regeneration control method of the present invention.

[0131] 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 in 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, a multi-cloud, etc., or any combination thereof.

[0132] 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.

[0133] 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.

[0134] In some embodiments, the display 703 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an organic light-emitting diode (OLED) touch device, etc. The display 703 is used to display information on the electronic device 700 and to display a visual user interface. The components 701-703 of the electronic device 700 communicate with each other via a system bus.

[0135] In one embodiment, when the processor 701 executes the DPF parking regeneration control program in the memory 702, the following steps may be implemented: When a parking regeneration request is received, a temperature deviation between an inlet temperature of the DOC and a target temperature is obtained; 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, the vehicle is controlled to perform parking regeneration.

[0136] 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, other functions can also be implemented. For details, please refer to the description of the corresponding method embodiment above.

[0137] Furthermore, the embodiment of the present invention does not specifically limit the type of the electronic device 700 mentioned, and 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, etc. 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).

[0138] 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 in the DPF parking regeneration control method provided in the above-mentioned method embodiments can be implemented.

[0139] 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.

[0140] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0141] 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 in this article 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 of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. 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: When a parking regeneration request is received, a temperature deviation between an inlet temperature of the DOC and a target temperature is obtained; 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, the vehicle is controlled to perform parking regeneration.

2. The DPF parking regeneration control method according to claim 1, characterized in that: 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.

3. The DPF parking regeneration control method according to claim 2, characterized in that: When the temperature deviation is outside a preset range, adjusting the inlet temperature based on the 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 amount and increase main injection timing.

4. The DPF parking regeneration control method according to claim 2, characterized in that: When the temperature deviation is outside a preset range, adjusting the inlet temperature based on the 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.

5. The DPF parking regeneration control method according to claim 1, characterized in that: After the temperature deviation is within the preset range, the vehicle is controlled to perform parking regeneration, 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 the operating condition parameters corresponding to the temperature deviation.

6. The DPF parking regeneration control method according to claim 1, characterized in that: Before obtaining the temperature deviation between the inlet temperature of the DOC 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.

7. A DPF parking regeneration control device, characterized in that: include: An acquisition module, for acquiring a temperature deviation between an inlet temperature of the DOC and a target temperature when a parking regeneration request is received; A regulating module, configured to regulate 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 used to control the vehicle to perform parking regeneration until the temperature deviation is within the preset range.

8. 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 used to execute the program stored in the memory to implement the DPF parking regeneration control method as described in any one of claims 1 to 6.

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

10. A computer program product, comprising a computer program, 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 6 is implemented.

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