An engine air intake control method and device, storage medium and electronic device

Abstract

The application discloses an engine intake control method and device, a storage medium and an electronic device, and relates to the technical field of engine intake control. The engine intake control method specifically comprises the following steps: obtaining a conventional target vacuum degree of an intake manifold, and presetting a diagnostic additional target vacuum degree; confirming a target pressure of the intake manifold according to the conventional target vacuum degree and the diagnostic additional target vacuum degree; and controlling a related air path actuator to maintain the measured pressure of the intake manifold to meet the target pressure. By setting the additional target vacuum degree, combining the real-time obtained conventional target vacuum degree, confirming a target pressure, taking the target pressure as a target parameter, controlling the related air path actuator to meet the target parameter, realizing the closed-loop control of the vacuum degree of the intake manifold of the engine, laying a foundation for the diagnosis feasibility and robustness, thereby improving the distinction degree of the manifold pressure between the normal and fault carbon canister electromagnetic valves, and reducing the false alarm of the carbon canister valve jamming fault.

Description

Technical Field

[0001] This invention belongs to the technical field of engine intake control, and particularly relates to an engine intake control method, device, storage medium, and electronic equipment. Background Technology

[0002] Faced with severe energy and environmental pressures, more and more engines are adopting VVL (Variable Valve Lift) technology to continuously control valve lift, thereby significantly reducing pumping losses and fuel consumption. At the same time, it increases in-cylinder swirl, enabling flexible scavenging and EGR (Exhaust Gas Recirculation), improving in-cylinder combustion stability and optimizing emissions.

[0003] At the same time, the China VI emission standard has put forward higher requirements for the diagnosis of evaporation leakage systems. Related components need to be monitored in accordance with the standards of comprehensive components (circuit continuity, rationality, etc.), which includes the diagnosis of high and low pressure desorption pipelines.

[0004] Diagnosing the low-pressure desorption line in engines using VVL systems presents certain unique challenges. For the canister purge solenoid valve, the traditional, reasonable diagnostic strategy involves observing changes in manifold pressure when the engine is operating under low load conditions, where the intake manifold vacuum is high. However, in engines equipped with VVL systems, to achieve lower fuel consumption, the ECU (Electronic Control Unit) reduces the VVL lift to minimize pumping losses under low load conditions, resulting in a very low intake manifold vacuum (e.g., 50 hPa). Under these conditions, diagnosing the canister purge valve becomes difficult because there is no clear distinction between normal and faulty solenoid valves, easily leading to false alarms of a stuck canister purge valve. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an engine intake control method, device, storage medium, and electronic equipment. By setting an additional target vacuum level and combining it with the real-time acquired conventional target vacuum level, a target pressure is identified. This target pressure is then used as a target parameter to control the associated air circuit actuator to meet the target parameter, thereby achieving closed-loop control of the engine intake manifold vacuum level. This lays the foundation for diagnostic feasibility and robustness, thereby improving the differentiation of manifold pressure between normal and faulty canister solenoid valves and reducing false alarms of canister valve sticking.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to one aspect of the embodiments of this application, an engine intake control method is provided, specifically including:

[0008] Obtain the standard target vacuum level of the intake manifold and preset an additional target vacuum level for diagnostics;

[0009] Based on the standard target vacuum level and the diagnostic additional target vacuum level, confirm the target pressure of the intake manifold;

[0010] The associated pneumatic actuators are controlled to maintain the measured pressure in the intake manifold to meet the target pressure.

[0011] Optionally, confirming the target pressure of the intake manifold specifically includes:

[0012] Use the sum of the standard target vacuum level and the diagnostic additional target vacuum level as the input value;

[0013] The target pressure of the intake manifold is determined based on the difference between the sum and the current ambient air pressure.

[0014] Optionally, the associated air path actuator includes a throttle actuator, wherein controlling the associated air path actuator to maintain the measured pressure in the intake manifold meeting the target pressure includes:

[0015] Based on the target pressure and the upstream pressure of the throttle valve, determine the target pressure ratio between the upstream and downstream sides of the throttle valve;

[0016] Determine the target throttle opening based on the target pressure ratio;

[0017] The throttle actuator controls the corresponding opening degree based on the target throttle opening degree.

[0018] Furthermore, the method for obtaining the target pressure ratio upstream and downstream of the throttle valve:

[0019] The target pressure ratio between the upstream and downstream sides of the throttle valve is obtained by dividing the target pressure by the upstream pressure of the throttle valve.

[0020] Preferably, after determining the target throttle opening based on the target pressure ratio, and before the throttle actuator controls the corresponding opening based on the target throttle opening, the following steps are also included:

[0021] Confirm the deviation value based on the measured air pressure and target pressure at the throttle valve;

[0022] Based on the deviation value, determine the target intake volume of the corrected throttle valve;

[0023] Adjust the target throttle opening based on the target intake volume.

[0024] The advantage of this embodiment is that by calculating the deviation value, the control accuracy is improved, thereby enhancing the execution effect of the engine air circuit closed-loop control of this application.

[0025] Furthermore, the method for obtaining the deviation value:

[0026] The deviation value is obtained by subtracting the target pressure from the measured air pressure at the throttle valve.

[0027] Furthermore, based on the deviation value, the target intake air volume for correcting the throttle body is determined, including:

[0028] The measured air pressure at the throttle valve is compared with the target pressure, and PID control calculations are performed to generate the throttle valve correction coefficient.

[0029] Based on the throttle correction factor, confirm the target airflow for the corrected throttle.

[0030] Preferably, before determining the target airflow for the corrected throttle valve based on the throttle valve correction factor, the following steps are included:

[0031] The throttle correction coefficients for various operating conditions are preset and self-learned to form a correction coefficient library for various different operating conditions;

[0032] Match the actual operating conditions with the preset operating conditions, and select the throttle correction coefficient for the actual operating conditions.

[0033] The advantage of this embodiment is that the self-learning method can quickly and accurately determine the appropriate correction coefficient for the corresponding working condition.

[0034] Furthermore, the associated pneumatic actuator includes a VVL lift actuator, wherein controlling the associated pneumatic actuator to maintain the measured pressure in the intake manifold meeting the target pressure includes:

[0035] The original intake flow rate is corrected based on the target pressure to obtain the actual intake flow rate;

[0036] Based on the actual intake flow rate, confirm the actual intake charge and use the actual intake charge as the input quantity;

[0037] Based on the actual intake air volume and the engine's real-time speed, the target lift of the VVL is determined, and the VVL lift actuator performs the corresponding lift control.

[0038] Furthermore, based on the actual intake airflow, confirm the actual intake charge, including:

[0039] The actual intake charge is determined by the difference between the cylinder contents and the actual intake air volume.

[0040] According to another aspect of the embodiments of this application, an engine intake control device is provided, comprising:

[0041] The acquisition module is used to acquire the normal target vacuum level of the intake manifold and preset the additional target vacuum level for diagnosis.

[0042] The determination module is used to confirm the target pressure of the intake manifold based on the regular target vacuum and the diagnostic additional target vacuum.

[0043] The execution module is used to control the associated pneumatic actuators to maintain the measured pressure in the intake manifold to meet the target pressure.

[0044] According to another aspect of the embodiments of this application, a storage medium is provided that stores computer-readable instructions thereon, which, when executed by a computer's processor, cause the computer to perform the above-described engine intake control method.

[0045] According to another aspect of the embodiments of this application, an electronic device is provided, comprising:

[0046] One or more processors;

[0047] A storage device for storing one or more programs that, when executed by one or more processors, cause the electronic device to implement the engine intake control method described above.

[0048] It should be noted that the terms "first," "second," and similar terms used in this article are merely for describing the constituent elements of the technical solution and do not constitute a limitation on the technical solution, nor should they be interpreted as an indication or implication of the importance of the corresponding elements; elements with terms such as "first," "second," or similar terms indicate that at least one of the elements is included in the corresponding technical solution. Attached Figure Description

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0050] The same reference numerals in the attached diagrams represent the same parts, specifically:

[0051] Figure 1 This is an overall flowchart of the engine intake control method of this application;

[0052] Figure 2 This is a flowchart illustrating an example throttle actuator control method in this application;

[0053] Figure 3 Here is a flowchart of another example throttle actuator control method of this application;

[0054] Figure 4 This is a flowchart of the VVL actuator control method of this application;

[0055] Figure 5 This is an overall flowchart of the example engine intake control method of this application;

[0056] Figure 6 This is a flowchart of the throttle actuator self-learning control method of this application;

[0057] Figure 7 This is an overall flowchart of another example engine intake control method of this application;

[0058] Figure 8 Example measurement test results for this application;

[0059] Figure 9 for Figure 8 A magnified view of a portion of the image;

[0060] Figure 10 This is a control block diagram of the engine intake control device of this application;

[0061] Figure 11 This is a schematic diagram of the computer system of the example electronic device of this application. Detailed Implementation

[0062] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0063] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0064] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0065] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0066] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0067] like Figure 1 As shown, based on the control principle and logic of VVL systems, an engine intake control method is provided, characterized by the following steps:

[0068] Obtain the standard target vacuum level of the intake manifold and preset an additional target vacuum level for diagnostics;

[0069] Based on the standard target vacuum level and the diagnostic additional target vacuum level, confirm the target pressure of the intake manifold;

[0070] The associated pneumatic actuators are controlled to maintain the measured pressure in the intake manifold to meet the target pressure.

[0071] It should be noted that the standard target vacuum specifically refers to the normal vacuum level in the engine intake manifold of an engine with VVL (Variable Valve Lift) function under low load conditions, which is also the diagnostic condition for the evaporation system. This vacuum level is generally low. The diagnostic additional target vacuum level is a preset value that is superimposed on the standard target vacuum level to obtain the final target vacuum level. The target intake manifold pressure is then calculated. The actual measured pressure value will be adjusted according to the target pressure, thereby improving the flexibility of the engine intake control method.

[0072] The sum of the standard target vacuum and the diagnostic additional target vacuum is used as the input value; the target pressure of the intake manifold is determined based on the difference between this sum and the current ambient pressure. The difference between the sum and atmospheric pressure is expressed by the following expression:

[0073] Ps_soll=P-(Ps_normal+Dpsdtev)

[0074] In the formula, Ps_soll represents the target pressure; P represents atmospheric pressure; Ps_normal represents the normal target vacuum degree; and Dpsdtev represents the diagnostic additional target vacuum degree.

[0075] When the canister valve diagnostic flag is activated, this strategy allows setting an additional diagnostic target vacuum, which is added to the existing target vacuum under normal operating conditions to calculate the target pressure of the intake manifold. The target pressure is then sent as an input value to the pneumatic control module, which issues control commands to control the corresponding pneumatic actuators to maintain the intake manifold pressure at the target pressure.

[0076] For illustrative purposes, the airflow control module includes Module 1 and Module 2. Module 1 serves as the control command generation module for the throttle actuator, and Module 2 serves as the control command generation module for the VVL (Variable Valve Lift). The throttle and VVL work together to achieve the target manifold vacuum level designed by the strategy, providing feasibility for subsequent diagnostics.

[0077] In some embodiments, such as Figure 2 As shown, the associated air path actuator includes a throttle actuator, wherein controlling the associated air path actuator to maintain the measured pressure in the intake manifold meeting the target pressure includes:

[0078] Based on the target pressure and the upstream pressure of the throttle valve, determine the target pressure ratio between the upstream and downstream sides of the throttle valve;

[0079] Determine the target throttle opening based on the target pressure ratio;

[0080] The throttle actuator controls the corresponding opening degree based on the target throttle opening degree.

[0081] Method for obtaining the target pressure ratio upstream and downstream of the throttle valve: The target pressure is divided by the upstream pressure of the throttle valve to obtain the target pressure ratio upstream and downstream of the throttle valve. Specifically, the target pressure ratio upstream and downstream of the throttle valve is expressed by the following expression:

[0082]

[0083] In the formula, Ps_soll represents the target pressure; Pvdkds represents the upstream pressure of the throttle valve; and Pspvdk_soll represents the upstream and downstream target pressure ratio of the throttle valve.

[0084] To further improve the intake control effect of the throttle valve, such as Figure 3 As shown, after determining the target throttle opening based on the target pressure ratio, before the throttle actuator controls the corresponding opening based on the target throttle opening, the following steps are also included:

[0085] Confirm the deviation value based on the measured air pressure and target pressure at the throttle valve;

[0086] Based on the deviation value, determine the target intake volume of the corrected throttle valve;

[0087] Adjust the target throttle opening based on the target intake volume.

[0088] By dynamically adjusting the difference calculation, the deviation value is added to the target intake flow control at the throttle valve to achieve closed-loop control of the intake manifold target pressure, while reducing the possible control deviation of the manifold pressure.

[0089] The method for obtaining the deviation value is as follows:

[0090] The deviation value is obtained by subtracting the target pressure from the measured air pressure at the throttle valve.

[0091] Furthermore, such as Figure 4 and Figure 5 As shown, the associated pneumatic actuator includes a VVL lift actuator, wherein controlling the associated pneumatic actuator to maintain the measured pressure in the intake manifold meeting the target pressure includes:

[0092] The original intake flow rate is corrected based on the target pressure to obtain the actual intake flow rate;

[0093] Based on the actual intake flow rate, confirm the actual intake charge and use the actual intake charge as the input quantity;

[0094] Based on the actual intake air volume and the engine's real-time speed, the target lift of the VVL is determined, and the VVL lift actuator performs the corresponding lift control.

[0095] Among these, determining the actual intake charge based on the actual intake flow rate includes:

[0096] The actual intake charge is determined by the difference between the cylinder contents and the actual intake air volume.

[0097] In some embodiments, in order to achieve precise control of the manifold target pressure, the air path control module also includes a third module, which also uses the target pressure as an input to the third module for throttle correction calculation.

[0098] Specifically, such as Figure 6 and Figure 7 As shown, based on the deviation value, the target intake air volume for correcting the throttle body is determined, including:

[0099] The measured air pressure at the throttle valve is compared with the target pressure, and PID control calculations are performed to generate the throttle valve correction coefficient.

[0100] Based on the throttle correction factor, confirm the target airflow for the corrected throttle.

[0101] In some embodiments, it should be noted that before confirming the target airflow for the corrected throttle valve based on the throttle valve correction factor, the following steps are included:

[0102] The throttle correction coefficients for various operating conditions are preset and self-learned to form a correction coefficient library for various different operating conditions;

[0103] Match the actual operating conditions with the preset operating conditions, and select the throttle correction coefficient for the actual operating conditions.

[0104] The self-learning method can quickly and accurately identify the appropriate correction factor for the corresponding operating conditions. Furthermore, it allows the throttle correction factor to adapt to various different testing conditions through self-learning.

[0105] To verify the feasibility of this application, the following experimental data is provided as an example:

[0106] like Figure 8 As shown in the figure, the horizontal axis represents time; the three vertical axes, from left to right, represent manifold pressure, carbon canister solenoid valve control PWM duty cycle, and manifold pressure change rate, respectively.

[0107] like Figure 8 and Figure 9 As shown in the figure, lines numbered 1-5 from top to bottom represent:

[0108] B_dtevact: Evaporation system diagnostic activation flag;

[0109] Ps_w: Actual manifold pressure;

[0110] Ps_soll_f: Target manifold pressure;

[0111] Tateout: The PWM duty cycle is controlled by the carbon canister solenoid valve.

[0112] Dpsdte: (Diagnosis-related) rate of change in mandibular pressure.

[0113] like Figure 8 As shown, after the carbon canister valve rationality diagnostic flag (B_dtevact) is activated, the strategy sets an additional diagnostic target vacuum (Ps_soll_f from 970 to 920 hPa). By controlling the throttle and VVL actions, the intake manifold pressure is reduced (Ps_w) and kept stable during the diagnostic process, laying the foundation for diagnostic feasibility and robustness.

[0114] After the diagnostics were completed, the additional vacuum requirement was removed, and the intake pressure was restored to the original control target (920 to 970 hPa). The test results show that performing a carbon canister rationality diagnostic under the target vacuum level provides discriminative results, improves diagnostic robustness, and reduces false alarms during after-sales service.

[0115] It should be noted that the diagnostic strategy for the China VI evaporation system of this VVL engine is not limited to the diagnosis of the carbon canister valve's rationality. The strategy and implementation scheme for the intake manifold pressure control are universally applicable to the air path control of VVL engines, especially the correction of the intake manifold target pressure to the in-cylinder intake volume and the closed-loop control strategy for the intake manifold pressure.

[0116] Figure 10 A block diagram of an engine intake control device according to an embodiment of this application is shown.

[0117] like Figure 10 As shown, an engine intake control device according to this application includes:

[0118] The actual intake charge is determined by the difference between the cylinder contents and the actual intake air volume.

[0119] According to another aspect of the embodiments of this application, an engine intake control device is provided, comprising:

[0120] The acquisition module is used to acquire the normal target vacuum level of the intake manifold and preset the additional target vacuum level for diagnosis.

[0121] The determination module is used to confirm the target pressure of the intake manifold based on the regular target vacuum and the diagnostic additional target vacuum.

[0122] The execution module is used to control the associated pneumatic actuators to maintain the measured pressure in the intake manifold to meet the target pressure.

[0123] It should be noted that the engine intake control device provided in the above embodiments and the engine intake control method provided in the above embodiments belong to the same concept. The specific way in which each module and unit performs operations has been described in detail in the method embodiments, and will not be repeated here.

[0124] Embodiments of this application also provide an electronic device, including:

[0125] One or more processors;

[0126] A storage device for storing one or more programs that, when executed by one or more processors, cause the charger to implement the above-described engine intake control method.

[0127] Figure 11 A schematic diagram of the structure of a computer system suitable for implementing the electronic device of the present application is shown.

[0128] It should be noted that, Figure 11 The computer system of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0129] like Figure 11As shown, the computer system includes a Central Processing Unit (CPU), which can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) or loaded from storage into random access memory (RAM), such as executing the methods described in the above embodiments. The RAM also stores various programs and data required for system operation. The CPU, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0130] The following components are connected to the I / O interface: input components including keyboards, mice, etc.; output components including cathode ray tubes (CRTs), liquid crystal displays (LCDs), and speakers; storage components including hard drives; and communication components including network interface cards such as LAN (Local Area Network) cards and modems. The communication components perform communication processing via networks such as the Internet. Drives are also connected to the I / O interface as needed. Removable media, such as disks, optical discs, magneto-optical discs, semiconductor memories, etc., are installed on the drive as needed so that computer programs read from them can be installed into the storage components as required.

[0131] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication component, and / or installed from a removable medium. When the computer program is executed by a central processing unit (CPU), it performs various functions defined in the system of this application.

[0132] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. The transmitted data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0133] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0134] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0135] In another aspect, this application also provides a computer-readable storage medium storing computer-readable instructions thereon, which, when executed by a computer's processor, cause the computer to perform the aforementioned engine intake control method. The aforementioned computer-readable storage medium carries one or more programs, which, when executed by an electronic device, cause the electronic device to implement the engine intake control method described in the above embodiments.

[0136] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0137] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the method according to the embodiments of this application.

[0138] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0139] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An engine intake control method, wherein the engine employs a VVL system, characterized in that, Specifically, it includes: Obtain the standard target vacuum level of the intake manifold and preset an additional target vacuum level for diagnostics; Based on the standard target vacuum level and the diagnostic additional target vacuum level, confirm the target pressure of the intake manifold; The associated pneumatic actuators are controlled to maintain the measured pressure in the intake manifold at the target pressure; specifically, confirming the target pressure in the intake manifold includes: Use the sum of the standard target vacuum level and the diagnostic additional target vacuum level as the input value; Based on the difference between the sum and the current ambient air pressure, the target pressure of the intake manifold is determined; Among them, the associated pneumatic actuators include at least a VVL lift actuator and a throttle actuator; the conventional target vacuum degree characterizes the normal vacuum degree in the engine intake manifold under diagnostic conditions; the diagnostic additional target vacuum degree characterizes the additional vacuum degree preset during diagnostics to improve the diagnostic accuracy of the carbon canister solenoid valve.

2. The engine intake control method according to claim 1, characterized in that, The associated airflow actuator includes a throttle actuator, wherein controlling the associated airflow actuator to maintain the measured pressure in the intake manifold to meet the target pressure includes: Based on the target pressure and the upstream pressure of the throttle valve, determine the target pressure ratio between the upstream and downstream sides of the throttle valve; Determine the target throttle opening based on the target pressure ratio; The throttle actuator controls the corresponding opening degree based on the target throttle opening degree.

3. The engine intake control method according to claim 2, characterized in that, Method for obtaining the target pressure ratio upstream and downstream of the throttle valve: The target pressure ratio between the upstream and downstream sides of the throttle valve is obtained by dividing the target pressure by the upstream pressure of the throttle valve.

4. The engine intake control method according to claim 2, characterized in that, After determining the target throttle opening based on the target pressure ratio, before the throttle actuator controls the corresponding opening based on the target throttle opening, the following steps are also included: Confirm the deviation value based on the measured air pressure and target pressure at the throttle valve; Based on the deviation value, determine the target intake volume of the corrected throttle valve; Adjust the target throttle opening based on the target intake volume.

5. The engine intake control method according to claim 4, characterized in that, Method for obtaining deviation value: The deviation value is obtained by subtracting the target pressure from the measured air pressure at the throttle valve.

6. The engine intake control method according to claim 4, characterized in that, Based on the deviation value, determine the target intake air volume for correcting the throttle body, including: The measured air pressure at the throttle valve is compared with the target pressure, and PID control calculations are performed to generate the throttle valve correction coefficient. Based on the throttle correction factor, confirm the target airflow for the corrected throttle.

7. The engine intake control method according to claim 6, characterized in that, Before determining the target airflow for the corrected throttle body based on the throttle correction factor, the following steps are included: The throttle correction coefficients for various operating conditions are preset and self-learned to form a correction coefficient library for various different operating conditions; Match the actual operating conditions with the preset operating conditions, and select the throttle correction coefficient for the actual operating conditions.

8. The engine intake control method according to any one of claims 1-7, characterized in that, The associated pneumatic actuator includes a VVL lift actuator, wherein controlling the associated pneumatic actuator to maintain the measured pressure in the intake manifold to meet the target pressure includes: The original intake flow rate is corrected based on the target pressure to obtain the actual intake flow rate; Based on the actual intake flow rate, confirm the actual intake charge and use the actual intake charge as the input quantity; Based on the actual intake air volume and the engine's real-time speed, the target lift of the VVL is determined, and the VVL lift actuator performs the corresponding lift control.

9. The engine intake control method according to claim 8, characterized in that, Based on the actual intake airflow, confirm the actual intake charge, including: The actual intake charge is determined by the difference between the cylinder contents and the actual intake air volume.

10. An engine intake control device, wherein the engine employs a VVL system, characterized in that, include: The acquisition module is used to acquire the normal target vacuum level of the intake manifold and preset the additional target vacuum level for diagnosis. The determination module is used to determine the target pressure of the intake manifold based on the conventional target vacuum and the diagnostic additional target vacuum; wherein, determining the target pressure of the intake manifold specifically includes: taking the sum of the conventional target vacuum and the diagnostic additional target vacuum as an input value; and determining the target pressure of the intake manifold based on the difference between the sum and the current ambient air pressure; The execution module is used to control the associated pneumatic actuators to maintain the measured pressure in the intake manifold to meet the target pressure. Among them, the associated pneumatic actuators include at least a VVL lift actuator and a throttle actuator; the conventional target vacuum degree characterizes the normal vacuum degree in the engine intake manifold under diagnostic conditions; the diagnostic additional target vacuum degree characterizes the additional vacuum degree preset during diagnostics to improve the diagnostic accuracy of the carbon canister solenoid valve.

11. A storage medium, characterized in that, It stores computer-readable instructions that, when executed by a computer's processor, cause the computer to perform the engine intake control method according to any one of claims 1-9.

12. An electronic device, characterized in that, include: One or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the engine intake control method as described in any one of claims 1-9.

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