A supercharging stability control method, device and vehicle

Abstract

The present invention provides a boost stability control method, device and automobile. When it is detected that the boost pressure stability control mode needs to be activated, the boost open-loop control and the boost closed-loop control are decoupled, and the output value of the boost open-loop control is stopped from being updated, thereby preventing the output value of the boost open-loop control from constantly changing. At this time, the opening angle of the target object is calculated only based on the boost closed-loop control, and the opening angle of the target object is controlled based on the calculation result until the boost pressure stability meets the preset conditions. In this process, since the output value of the boost open-loop control no longer changes, the problem of the actual boost pressure constantly fluctuating around the target boost pressure is solved.

Description

Technical Field

[0001] This invention relates to the field of automotive control technology, specifically to a boost stability control method, device, and vehicle. Background Technology

[0002] From the current technological development trend of passenger vehicle drive systems, plug-in hybrid electric vehicles (PHEVs) will be one of the mainstream choices in the future. The power source of the PHEV architecture consists of an electric motor and an engine, which are coupled and complementary. The energy management system is based on the control of the vehicle's energy consumption, and has high requirements for the achievement value and range of high thermal efficiency conditions of the engine. Emission regulations have also significantly broadened the operating range of the engine's optimal emission window, shifting the engine's non-enriched operating range towards medium-to-high speed and medium-to-high load. Under the requirements of the above-mentioned technical routes and emission regulations, the PHEV configuration has high requirements for the thermal efficiency of the gasoline engine. For high thermal efficiency technical routes, design concepts such as high compression ratio, high tumble flow, Miller cycle, and low-pressure EGR are generally chosen. At the same time, the adoption of exhaust gas turbocharging technology and the design of a large volute and large flow channel will also effectively improve fuel consumption and emissions at medium-to-high speed and medium-to-high load.

[0003] Currently, the boost control strategy for high-efficiency gasoline engines can be basically divided into two parts: open-loop control and closed-loop control. These two parts work together to achieve the goal of the actual boost pressure following the target boost pressure. Open-loop boost pressure control is generally based on a boost model related to exhaust flow rate, calculating the opening value of the exhaust bypass valve (for bypass-type turbochargers) or variable nozzle ring (for variable-section turbochargers) based on the current operating conditions. Closed-loop control, based on the opening value calculated by open-loop control, performs proportional, integral, and derivative calculations on the deviation between the target boost pressure and the actual boost pressure to obtain a closed-loop correction value. The open-loop opening value and the closed-loop correction value work together to ultimately control the opening angle of the exhaust bypass valve or variable nozzle ring.

[0004] For high thermal efficiency gasoline engines, many technical solutions such as high compression ratio, high tumble flow, Miller cycle, low-pressure EGR, and large flow channel design of the volute, while improving thermal efficiency, also pose a significant challenge to the turbine efficiency of the exhaust gas turbocharger, especially at medium and high speeds. The opening of the turbine bypass valve or the effective stroke range of the variable nozzle ring becomes smaller and shifts towards a smaller opening. Especially under heavy load conditions, even slight changes in the opening can have a significant impact on the boost pressure. In this case, it is easy to cause fluctuations in boost pressure, which is not conducive to the stability control of the system.

[0005] When the boost pressure fluctuates, the existing control strategy will perform closed-loop control based on the deviation caused by the fluctuation, thereby correcting the opening angle of the exhaust bypass valve or variable nozzle ring. In the case described above, the corrected opening angle will lead to a significant change in exhaust flow, which in turn will update the open-loop opening value and cause the opening angle to change again, resulting in a new deviation in the boost pressure. At this time, the closed-loop control will start a new cycle of control, and so on, causing the actual boost pressure to fluctuate around the target boost pressure. Summary of the Invention

[0006] In view of this, embodiments of the present invention provide a boost stability control method, apparatus, and automobile to improve the boost stability of the automobile.

[0007] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0008] A boost stability control method, comprising:

[0009] Obtain target parameters, which are vehicle operating data related to turbocharger stability;

[0010] Based on the target parameters, determine whether to activate the boost pressure stability control mode;

[0011] When the boost pressure stability control mode is activated, the boost open-loop control and boost closed-loop control are decoupled.

[0012] Stop updating the output value of the boost open-loop control;

[0013] The opening angle of the target object is calculated based on the pressure boosting closed-loop control, and the opening angle of the target object is controlled based on the calculation result.

[0014] Determine whether the boost pressure stability meets the preset conditions;

[0015] When the boost pressure stability meets the preset conditions, the correlation between the boost open-loop control and the boost closed-loop control is restored, the output value of the boost open-loop control is updated, and the boost pressure stability control mode is exited.

[0016] Optionally, in the above-mentioned boost pressure stability control method, before decoupling the boost open-loop control and the boost closed-loop control when the boost pressure stability control mode is activated, the method further includes:

[0017] The actual boost pressure signal and the opening angle of the target object are calculated synchronously.

[0018] Optionally, in the above-described boost stability control method, the target parameter includes one or more of the following combinations:

[0019] Engine speed;

[0020] Accelerator pedal opening;

[0021] Target boost pressure;

[0022] Actual boost pressure;

[0023] Actual boost pressure change rate;

[0024] Actual boost pressure fluctuation amplitude;

[0025] The actual boost pressure deviates from the target boost pressure;

[0026] Exhaust gas bypass valve opening angle;

[0027] Variable cross-section nozzle ring opening angle.

[0028] Optionally, in the above-mentioned boost pressure stability control method, determining whether the boost pressure stability meets the preset conditions includes:

[0029] Obtain the actual boost pressure change rate and the actual boost pressure fluctuation amplitude;

[0030] Determine whether the actual rate of change of boost pressure is within a preset rate of change range;

[0031] Determine whether the actual boost pressure fluctuation amplitude is within the preset fluctuation range;

[0032] When the actual boost pressure change rate is within a preset change rate range and the actual boost pressure fluctuation amplitude is within a preset fluctuation range, it indicates that the boost pressure stability meets the preset conditions; otherwise, it indicates that the boost pressure stability does not meet the preset conditions.

[0033] Optionally, in the above-mentioned boost pressure stability control method, determining whether to activate the boost pressure stability control mode based on the target parameter includes:

[0034] Determine whether at least one of the parameters in the target parameters is within its corresponding preset value range. If the determination result is yes, it indicates that the boost pressure stability control mode needs to be activated; otherwise, it indicates that the boost pressure stability control mode does not need to be activated.

[0035] Optionally, in the above-mentioned boost pressure stability control method, before determining whether to activate the boost pressure stability control mode based on the target parameters, the method further includes:

[0036] Obtain vehicle operating conditions;

[0037] Obtain the preset value range corresponding to each parameter in the target parameters that match the vehicle operating conditions.

[0038] Optionally, in the above-mentioned boosting stability control method, when the turbocharger in the car is a bypass valve type exhaust gas turbocharger, the target object is the exhaust gas bypass valve;

[0039] When the turbocharger in the car is a variable cross-section exhaust gas turbocharger, the target object is a variable cross-section nozzle ring.

[0040] Optionally, in the above-mentioned boost stability control method, the output value of the boost open-loop control is continuously updated, including:

[0041] The calculation result of the opening angle of the target object by the pressure boosting closed-loop control is assigned to the output value of the pressure boosting open-loop control;

[0042] The output value of the boost open-loop control is continuously updated based on the boost open-loop control scheme.

[0043] A boosting stability control device, comprising:

[0044] A data acquisition unit is used to acquire target parameters, which are vehicle operating data related to turbocharger stability;

[0045] The judgment unit is used to determine whether to activate the boost pressure stability control mode based on the target parameters.

[0046] The decoupling unit is used to decouple the boost open-loop control and the boost closed-loop control when the boost pressure stability control mode is activated; and to stop updating the output value of the boost open-loop control.

[0047] An opening angle calculation unit is used to calculate the opening angle of the target object based on the pressurization closed-loop control, and to control the opening angle of the target object based on the calculation result;

[0048] The stability judgment unit is used to determine whether the boost pressure stability meets the preset conditions. When the boost pressure stability meets the preset conditions, the decoupling unit is controlled to restore the correlation between the boost open-loop control and the boost closed-loop control, so as to continue to update the output value of the boost open-loop control and generate a control signal for exiting the boost pressure stability control mode.

[0049] An automobile, wherein the vehicle's on-board computer includes a memory and a processor;

[0050] The memory is used to store programs;

[0051] The processor is used to execute the program to implement each step of the boost stability control method described above.

[0052] Based on the above technical solution, the solution provided in this embodiment of the invention, when detecting the need to activate the boost pressure stability control mode, decouples the boost open-loop control and the boost closed-loop control, stops updating the output value of the boost open-loop control, thereby preventing the output value of the boost open-loop control from constantly changing. At this time, the opening angle of the target object is calculated only based on the boost closed-loop control, and the opening angle of the target object is controlled based on the calculation result until the boost pressure stability meets the preset conditions. During this process, since the output value of the boost open-loop control no longer changes, the problem of the actual boost pressure constantly fluctuating around the target boost pressure is solved. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0054] Figure 1 This is a schematic flowchart of the boosting stability control method disclosed in the embodiments of this application;

[0055] Figure 2 This is a schematic flowchart of a boost stability control method disclosed in another embodiment of this application;

[0056] Figure 3 This is a schematic diagram of the booster stability control device disclosed in the embodiments of this application;

[0057] Figure 4 The present application discloses a schematic diagram of the structure of a vehicle computer. Detailed Implementation

[0058] 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 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0059] This invention proposes a boost pressure stability control scheme. After determining that the activation conditions of the boost pressure stability control strategy are met, the boost pressure fluctuation amplitude is reduced through the boost pressure stability control scheme designed in this patent, thereby ensuring the stable operation of the system and eliminating the problems of large boost pressure fluctuations and system instability caused by boost pipeline delay and opening sensitivity.

[0060] For details, see Figure 1 This application discloses a boost stability control method, which may include:

[0061] Step S101: Obtain target parameters, which are vehicle operating data related to turbocharger stability.

[0062] In this solution, vehicle operating data related to turbocharger stability can be collected by the vehicle system. This data can be used to determine turbocharger stability. One or more parameters can be selected from this data as target parameters. Subsequent data analysis can be performed based on these target parameters. Boost stability analysis can be performed using these target parameters, and the results can be used to determine whether to activate the boost pressure stability control mode.

[0063] For example, in embodiments of this application, the target parameter includes one or more of the following combinations:

[0064] Engine speed;

[0065] Accelerator pedal opening;

[0066] Target boost pressure;

[0067] Actual boost pressure;

[0068] Actual pressure change rate;

[0069] Actual pressure fluctuation amplitude;

[0070] The actual boost pressure deviates from the target boost pressure;

[0071] Exhaust gas bypass valve opening angle;

[0072] Variable cross-section nozzle ring opening angle.

[0073] Step S102: Based on the target parameters, determine whether to activate the boost pressure stability control mode.

[0074] In this step, it is necessary to pre-configure the judgment strategy corresponding to the target parameter. These judgment strategies are used to determine whether the boost pressure stability control mode needs to be activated. Different judgment strategies correspond to different types of target parameters. After the target parameter is obtained in step S101, the obtained target parameter can be analyzed based on the judgment strategy that matches each target parameter. Based on the analysis result, it is determined whether the boost pressure stability control mode needs to be activated. If it is determined that the boost pressure stability control mode needs to be activated, the subsequent steps are continued. Otherwise, the process returns to step S101 and the target parameter is collected again.

[0075] In this scheme, multiple numerical ranges corresponding to the target parameters can be set. When any one of the target parameters falls within its corresponding numerical range, it indicates that the boost pressure stability control mode needs to be activated; otherwise, the boost pressure stability control mode is not needed. Specifically, this step can be as follows: determine whether at least one parameter among the target parameters is within its corresponding preset numerical range. If the determination result is yes, it indicates that the boost pressure stability control mode needs to be activated; otherwise, it indicates that the boost pressure stability control mode does not need to be activated. For example, when the target parameter is engine speed, if the engine speed is greater than a preset speed, it indicates that the boost pressure stability control mode needs to be activated; when the target parameter is accelerator pedal opening, if the accelerator pedal opening is greater than a preset opening, it indicates that the boost pressure stability control mode needs to be activated. For example, a judgment strategy corresponding to the target parameters can be pre-configured. After obtaining the target parameters, the determination of whether to activate the boost pressure stability control mode is based on the judgment strategy corresponding to the target parameters.

[0076] Step S103: When the boost pressure stability control mode is activated, the boost open-loop control and boost closed-loop control are decoupled.

[0077] When the boost pressure stability control mode is activated, the boost open-loop control and boost closed-loop control are decoupled in this step. After decoupling, the boost open-loop control and boost closed-loop control are no longer related and can be controlled independently. Both the boost open-loop control and boost closed-loop control are existing solutions, and those skilled in the art can choose any of the existing boost open-loop control and boost closed-loop control schemes as the boost open-loop control and boost closed-loop control in this application.

[0078] Step S104: Stop updating the output value of the boost open-loop control.

[0079] In this step, to address the issue of the actual boost pressure fluctuating around the target boost pressure due to the continuously updated opening angle calculated by the boost pressure open-loop control scheme, this scheme stops updating the output value of the boost pressure open-loop control when the activation of the boost pressure stability control mode is detected. This ensures that the output value of the boost pressure open-loop control remains unchanged, thereby resolving the problem of the actual boost pressure fluctuating around the target boost pressure caused by the continuously updated opening angle calculated by the boost pressure open-loop control scheme.

[0080] Step S105: Calculate the opening angle of the target object based on the pressurization closed-loop control, and control the opening angle of the target object based on the calculation result.

[0081] In this step, after stopping the update of the output value of the boost open-loop control, the opening angle of the target object is calculated based on the boost closed-loop control. The opening angle of the target object under the boost stability control mode is then calculated based on the calculation result of the boost closed-loop control. The target object can be a bypass valve or a variable cross-section nozzle ring.

[0082] Step S106: Determine whether the boost pressure stability meets the preset conditions.

[0083] In this step, after controlling the opening angle of the target object based on the calculation results, it is necessary to determine whether the boost pressure stability meets the requirements. If the preset conditions are met, the adjustment is complete, and step S107 is executed. If the boost pressure stability does not meet the preset conditions, step S105 is executed again, and this process is repeated until the boost pressure stability meets the preset conditions.

[0084] Step S107: When the boost pressure stability meets the preset conditions, restore the correlation between the boost open-loop control and the boost closed-loop control, continue to update the output value of the boost open-loop control, and exit the boost pressure stability control mode.

[0085] As can be seen from the above scheme, the boost pressure stability control method disclosed in this application decouples the boost pressure open-loop control and the boost pressure closed-loop control when it detects that the boost pressure stability control mode needs to be activated. It stops updating the output value of the boost pressure open-loop control, thereby preventing the output value of the boost pressure open-loop control from changing continuously. At this time, the opening angle of the target object is calculated only based on the boost pressure closed-loop control, and the opening angle of the target object is controlled based on the calculation result until the boost pressure stability meets the preset conditions. During this process, since the output value of the boost pressure open-loop control no longer changes, the problem of the actual boost pressure constantly fluctuating around the target boost pressure is solved.

[0086] In another embodiment of this application, considering the inherent system delay of the booster pipeline, this delay further amplifies the fluctuation of the actual booster pressure around the target booster pressure. Ultimately, under the conditions of open-loop and closed-loop coupled control, this results in significant fluctuations in booster pressure and system instability. Therefore, in this solution, when the booster pressure stability control mode is activated, before decoupling the open-loop and closed-loop booster control, the actual booster pressure signal and the opening angle of the target object can be calculated synchronously. This eliminates the inherent hysteresis of the booster pipeline, achieving synchronization between the opening angle and the actual booster pressure.

[0087] Furthermore, in the technical solution disclosed in this embodiment, when determining whether the boost pressure stability meets the preset conditions, a corresponding judgment strategy can be set based on design requirements. This judgment strategy is used to determine whether the boost pressure stability meets the preset conditions. Specifically, in this solution, the determination of whether the boost pressure stability meets the preset conditions can be based on the actual boost pressure change rate and / or the actual boost pressure fluctuation amplitude. Specifically, determining whether the boost pressure stability meets the preset conditions may include:

[0088] Step S201: Obtain the actual boost pressure change rate and the actual boost pressure fluctuation amplitude.

[0089] In this step, after controlling the opening angle of the target object based on the calculation results, the actual boost pressure is detected in real time, and the rate of change and fluctuation amplitude of the actual boost pressure are further calculated.

[0090] Step S202: Determine whether the actual rate of change of boost pressure is within the preset rate of change range.

[0091] The calculated actual rate of change of boost pressure is compared with a preset rate of change range to determine whether the actual rate of change of boost pressure falls within the preset rate of change range.

[0092] Step S203: Determine whether the actual boost pressure fluctuation amplitude is within the preset fluctuation range.

[0093] The calculated actual boost pressure fluctuation amplitude is compared with the preset fluctuation range to determine whether the actual boost pressure fluctuation amplitude is within the preset fluctuation range.

[0094] Step S204: When the actual boost pressure change rate is within a preset change rate range and the actual boost pressure fluctuation amplitude is within a preset fluctuation range, it indicates that the boost pressure stability meets the preset conditions; otherwise, it indicates that the boost pressure stability does not meet the preset conditions.

[0095] In this embodiment, the boost pressure stability is considered to meet the preset conditions and can exit the boost pressure stability control mode only when the actual boost pressure change rate is within the preset change rate range and the actual boost pressure fluctuation amplitude is within the preset fluctuation range. If either of the above two judgment conditions is not met, the boost pressure stability is considered not to meet the preset conditions, and step S105 needs to be executed again.

[0096] In another embodiment of this application, the target parameters for determining whether to activate the boost pressure stability control mode vary depending on the vehicle's operating conditions. Furthermore, the preset value ranges corresponding to the target parameters under different operating conditions can differ, thus enabling a more accurate determination of whether the vehicle needs to activate the boost pressure stability control mode. Therefore, in this solution, obtaining the target parameters includes: obtaining the vehicle's operating conditions and obtaining the target parameters matching those conditions. Before determining whether to activate the boost pressure stability control mode based on the target parameters, the solution further includes: obtaining the preset value ranges corresponding to each parameter in the target parameters matching the vehicle's operating conditions.

[0097] In the technical solution disclosed in this embodiment, considering that when the stability of the boost pressure is detected to meet the preset conditions, the calculation of the opening angle of the target object by the boost closed-loop control has been ongoing for a period of time, if the open-loop control is directly stopped when updating the output value of the boost open-loop control, the boost pressure will experience a brief and drastic fluctuation. Therefore, in this solution, when continuing to update the output value of the boost open-loop control, the calculation result of the opening angle of the target object by the boost closed-loop control can be assigned to the output value of the boost open-loop control. This allows the boost open-loop control scheme to continue updating the output value of the boost open-loop control based on the opening angle of the target object by the boost closed-loop control. This ensures the stability of the boost pressure when the output value of the boost open-loop control is continuously updated.

[0098] Through experimental verification, the applicant discovered that, in response to the problem of continuous pressure fluctuation in high thermal efficiency turbocharged engines employing technologies such as high compression ratio, high tumble flow, Miller cycle, low-pressure EGR, and large flow channel in the volute, as well as the amplification of the fluctuation problem by the inherent delay effect of different turbocharger pipelines, the solution designed in this paper can effectively eliminate and solve the above problems, thereby improving the stability of turbocharger control and the stability of engine operation.

[0099] This embodiment discloses a boosting stability control device. For the specific working content of each unit in the device, please refer to the content of the above method embodiment.

[0100] The boost stability control device provided in the embodiments of the present invention is described below. The boost stability control device described below can be referred to in correspondence with the boost stability control method described above.

[0101] See Figure 3 The boost stability control device may include:

[0102] Data acquisition unit A, which corresponds to step S101 in the above method, is used to acquire target parameters, which are vehicle operating data related to turbocharger stability;

[0103] Judgment unit B, which corresponds to step S102 in the above method, is used to determine whether to activate the boost pressure stability control mode based on the target parameters.

[0104] Decoupling unit C, which corresponds to steps S103-S104 in the above method, is used to decouple the boost open-loop control and the boost closed-loop control when the boost pressure stability control mode is activated; and to stop updating the output value of the boost open-loop control.

[0105] Opening angle calculation unit D, which corresponds to step S105 in the above method, is used to calculate the opening angle of the target object based on the pressurization closed-loop control, and control the opening angle of the target object based on the calculation result.

[0106] The stability judgment unit E, which corresponds to steps S106-S107 in the above method, is used to determine whether the boost pressure stability meets the preset conditions. When the boost pressure stability meets the preset conditions, the decoupling unit is controlled to restore the correlation between the boost open-loop control and the boost closed-loop control, so as to continue to update the output value of the boost open-loop control and generate a control signal for exiting the boost pressure stability control mode.

[0107] Corresponding to the above method, this application also discloses a vehicle, wherein the vehicle's on-board computer includes a memory and a processor, and the on-board computer may refer to the vehicle's ECU (Electronic Control Unit). Figure 4 The hardware structure diagram of the vehicle computer provided in the embodiment of the present invention is shown below. Figure 4 As shown, the vehicle computer may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0108] In this embodiment of the invention, the number of processor 100, communication interface 200, memory 300, and communication bus 400 is at least one, and the processor 100, communication interface 200, and memory 300 communicate with each other through communication bus 400; obviously, Figure 4 The communication connections shown for the processor 100, communication interface 200, memory 300, and communication bus 400 are optional.

[0109] Optionally, the communication interface 200 can be an interface of a communication module, such as the interface of a GSM module;

[0110] Processor 100 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

[0111] The memory 300 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0112] Specifically, the processor 100 is used to execute the boost stability control method disclosed in any of the above embodiments of this application. The specific details will not be repeated here, but can be found in the description of the above method embodiments.

[0113] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing this invention, the functions of each module can be implemented in one or more software and / or hardware components.

[0114] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0115] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0116] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0117] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0118] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling boosting stability, characterized in that, include: Obtain target parameters, which are vehicle operating data related to turbocharger stability; Based on the target parameters, determine whether to activate the boost pressure stability control mode; When the boost pressure stability control mode is activated, the boost open-loop control and boost closed-loop control are decoupled. Stop updating the output value of the boost open-loop control; The opening angle of the target object is calculated based on the pressure boosting closed-loop control, and the opening angle of the target object is controlled based on the calculation result. Determine whether the boost pressure stability meets the preset conditions; When the boost pressure stability meets the preset conditions, the correlation between the boost open-loop control and the boost closed-loop control is restored, the output value of the boost open-loop control is updated, and the boost pressure stability control mode is exited. Based on the target parameters, determining whether to activate the boost pressure stability control mode includes: determining whether to activate the boost pressure stability control mode based on whether the target parameters fall within their corresponding numerical range. Determining whether the boost pressure stability meets the preset conditions includes: judging whether the boost pressure stability meets the preset conditions based on the actual boost pressure change rate and / or the actual boost pressure fluctuation amplitude.

2. The boosting stability control method according to claim 1, characterized in that, When the boost pressure stability control mode is activated, before decoupling the boost open-loop control and the boost closed-loop control, the following steps are also included: The actual boost pressure signal and the opening angle of the target object are calculated synchronously.

3. The boosting stability control method according to claim 1, characterized in that, The target parameter includes one or more of the following combinations: Engine speed; Accelerator pedal opening; Target boost pressure; Actual boost pressure; Actual boost pressure change rate; Actual boost pressure fluctuation amplitude; The actual boost pressure deviates from the target boost pressure; Exhaust gas bypass valve opening angle; Variable cross-section nozzle ring opening angle.

4. The boosting stability control method according to claim 1, characterized in that, The determination of whether the boost pressure stability meets the preset conditions is based on the actual boost pressure change rate and / or the actual boost pressure fluctuation amplitude, specifically including: Obtain the actual boost pressure change rate and the actual boost pressure fluctuation amplitude; Determine whether the actual rate of change of boost pressure is within a preset rate of change range; Determine whether the actual boost pressure fluctuation amplitude is within the preset fluctuation range; When the actual boost pressure change rate is within a preset change rate range and the actual boost pressure fluctuation amplitude is within a preset fluctuation range, it indicates that the boost pressure stability meets the preset conditions; otherwise, it indicates that the boost pressure stability does not meet the preset conditions.

5. The boosting stability control method according to claim 3, characterized in that, Based on whether the target parameter falls within its corresponding numerical range, it determines whether to activate the boost pressure stability control mode, specifically including: Determine whether at least one of the parameters in the target parameters is within its corresponding preset value range. If the determination result is yes, it indicates that the boost pressure stability control mode needs to be activated; otherwise, it indicates that the boost pressure stability control mode does not need to be activated.

6. The boosting stability control method according to claim 4, characterized in that, Before determining whether to activate the boost pressure stability control mode based on the target parameters, the following steps are also included: Obtain vehicle operating conditions; Obtain the preset value range corresponding to each parameter in the target parameters that match the vehicle operating conditions.

7. The boosting stability control method according to claim 1, characterized in that, When the turbocharger in the car is a bypass valve type exhaust gas turbocharger, the target object is the exhaust gas bypass valve; When the turbocharger in the car is a variable cross-section exhaust gas turbocharger, the target object is a variable cross-section nozzle ring.

8. The boosting stability control method according to claim 1, characterized in that, Continue updating the output value of the boost open-loop control, including: The calculation result of the opening angle of the target object by the pressure boosting closed-loop control is assigned to the output value of the pressure boosting open-loop control; The output value of the boost open-loop control is continuously updated based on the boost open-loop control scheme.

9. A boosting stability control device, characterized in that, include: A data acquisition unit is used to acquire target parameters, which are vehicle operating data related to turbocharger stability; The judgment unit is used to determine whether to activate the boost pressure stability control mode based on the target parameters. The decoupling unit is used to decouple the boost open-loop control and the boost closed-loop control when the boost pressure stability control mode is activated; and to stop updating the output value of the boost open-loop control. An opening angle calculation unit is used to calculate the opening angle of the target object based on the pressurization closed-loop control, and to control the opening angle of the target object based on the calculation result; The stability judgment unit is used to determine whether the boost pressure stability meets the preset conditions. When the boost pressure stability meets the preset conditions, the decoupling unit is controlled to restore the correlation between the boost open-loop control and the boost closed-loop control, so as to continue to update the output value of the boost open-loop control and generate a control signal for exiting the boost pressure stability control mode. Based on the target parameters, determining whether to activate the boost pressure stability control mode includes: determining whether to activate the boost pressure stability control mode based on whether the target parameters fall within their corresponding numerical range. Determining whether the boost pressure stability meets the preset conditions includes: judging whether the boost pressure stability meets the preset conditions based on the actual boost pressure change rate and / or the actual boost pressure fluctuation amplitude.

10. A car, characterized in that, The vehicle's onboard computer includes a memory and a processor; The memory is used to store programs; The processor is used to execute the program to implement each step of the boost stability control method as described in any one of claims 1-6.

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