Methods, systems, electronic devices, and readable storage media for reducing oil rail pressure

Abstract

The application discloses a method, system, electronic device and readable storage medium for reducing oil rail pressure. The method comprises: obtaining a target oil leakage amount, which is an oil leakage amount required for reducing a current oil rail pressure to a preset oil rail pressure; determining a dynamic leakage number required for achieving the target oil leakage amount through a dynamic leakage mode; and if the dynamic leakage number is greater than a target number, using the dynamic leakage mode and a target fuel injection mode to perform oil leakage. The method can determine the number of times of dynamic leakage according to the target oil leakage amount, and if the number of times is greater than the target number, the method can also perform the target fuel injection mode, increase the internal pressure through fuel injection to accelerate oil leakage, and accelerate the actual rail pressure to the set rail pressure. Therefore, when the pure dynamic leakage cannot meet the requirements, the method can quickly reduce the actual rail pressure through the combined oil leakage mode of the dynamic leakage and the target fuel injection mode, and effectively avoid the problem of rough combustion.

Description

Technical Field

[0001] This application relates to the field of vehicle engineering, and more specifically, to a method, system, electronic device, and readable storage medium for reducing oil rail pressure. Background Technology

[0002] Under certain driving conditions (such as coasting), the vehicle's fuel injectors will return fuel, but the amount of fuel returned is small, causing the fuel rail pressure to rise, which leads to rough combustion when the vehicle is restarted.

[0003] To avoid the problem of rough combustion, the fuel rail needs to be depressurized. The current depressurization method uses dynamic leakage to release oil, but dynamic leakage is difficult to reduce the actual rail pressure to the set rail pressure, and the problem of rough combustion still exists. Summary of the Invention

[0004] In view of this, this application provides a method, system, electronic device, and readable storage medium for reducing fuel rail pressure to address the problem of rough combustion.

[0005] To achieve the above objectives, the following solution is proposed:

[0006] A method for reducing oil rail pressure, the method comprising:

[0007] Obtain the target oil drain volume, which is the oil drain volume required to reduce the current oil rail pressure to a preset oil rail pressure;

[0008] Determine the number of dynamic leaks required to achieve the target oil discharge volume using a dynamic leak method;

[0009] If the number of dynamic leaks exceeds the target number, then the dynamic leak method and the target injection method are used for oil leakage.

[0010] Optionally, determining the number of dynamic leaks required to achieve the target oil leakage amount through dynamic leaking includes:

[0011] Determine if the vehicle is in the ignition state;

[0012] Determine the dynamic leakage amount based on the assessment results;

[0013] The number of dynamic leaks is determined based on the dynamic leak amount.

[0014] Optionally, determining the dynamic leakage amount based on the judgment result includes:

[0015] If the vehicle is not in the ignition state, the dynamic leakage amount is: the leakage amount after subtracting the static leakage amount from the target leakage amount, where the static leakage amount is determined based on the factors affecting leakage.

[0016] If the vehicle is in the ignition state, the dynamic leakage amount is: the leakage amount after subtracting the static leakage amount and the first leakage amount from the target leakage amount, where the first leakage amount is: the leakage amount of the target fuel injection method.

[0017] Optionally, determining the number of dynamic leaks based on the dynamic leak amount includes:

[0018] Calculate the unit dynamic leakage volume under the influence of factors affecting oil spill;

[0019] The number of dynamic leaks is obtained based on the dynamic leakage amount and the unit dynamic leakage amount.

[0020] Optionally, the oil leakage using the dynamic leakage method and the target injection method includes:

[0021] Determine the target fuel injection method that is suitable for the current engine operating conditions;

[0022] After the target number of times is dynamically leaked, the target oil spraying method is used for oil spraying.

[0023] Optionally, determining the target fuel injection method that conforms to the current engine operating conditions includes:

[0024] Under the current operating conditions, determine the combustion noise and rail pressure reduction per unit for each combination of fuel injection methods;

[0025] Select one injection method from the various combinations of injection methods and determine it as the target injection method that meets the current engine operating conditions.

[0026] A system for reducing oil rail pressure, the system comprising:

[0027] The acquisition unit is used to acquire the target oil discharge amount, which is the amount of oil discharge required to reduce the current oil rail pressure to a preset oil rail pressure.

[0028] The determining unit is used to determine the number of dynamic leaks required to achieve the target oil leakage amount through dynamic leakage. If the number of dynamic leaks is greater than the target number, the oil leakage unit is triggered.

[0029] The oil draining unit is used to drain oil using the dynamic leakage method and the target injection method.

[0030] Optionally, the determining unit includes:

[0031] The status judgment subunit is used to determine whether the vehicle is in the ignition state;

[0032] The dynamic leakage determination subunit is used to determine the dynamic leakage based on the judgment result.

[0033] The leakage count determination subunit is used to determine the dynamic leakage count based on the dynamic leakage amount.

[0034] An electronic device, comprising a memory and a processor;

[0035] The memory is used to store programs;

[0036] The processor is configured to execute the program to implement each step of the method for reducing oil rail pressure described above.

[0037] A readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for reducing oil rail pressure as described above.

[0038] This application provides a method, system, electronic device, and readable storage medium for reducing fuel rail pressure. The method determines the number of dynamic leaks based on a target leak volume. If this number exceeds the target number, the method can also execute a target injection mode to accelerate leaking, thereby rapidly reducing the actual rail pressure to the set rail pressure. Therefore, when simple dynamic leaking is insufficient, this method, through a combination of dynamic leaking and a target injection mode, can quickly reduce the actual rail pressure and effectively avoid the problem of rough combustion. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0040] Figure 1 A schematic flowchart illustrating a method for reducing oil rail pressure provided in an embodiment of this application;

[0041] Figure 2 A schematic flowchart illustrating another method for reducing oil rail pressure provided in this application embodiment;

[0042] Figure 3 This application provides a schematic diagram of the structure of a system for reducing oil rail pressure according to an embodiment of the present application.

[0043] Figure 4This is a hardware structure block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] like Figure 1 As shown in the figure, this application provides a method for reducing oil rail pressure, which may include:

[0046] S10. Obtain the target oil discharge amount, which is the amount of oil discharge required to reduce the current oil rail pressure to the preset oil rail pressure.

[0047] The target oil leakage amount can be the amount of oil leakage required to reduce the current oil rail pressure to a preset oil rail pressure. In current technology, after each dynamic leakage operation, it is necessary to check whether the current oil rail pressure has dropped to the preset oil rail pressure before proceeding with the next dynamic leakage, resulting in significant time consumption and difficulty in timely reducing the oil rail pressure. This embodiment can directly calculate the total amount of oil leakage required for pressure reduction based on the required oil rail pressure, unaffected by the actual oil rail pressure during the pressure reduction process, and can effectively and accurately control the oil pressure. The target oil leakage amount can be calculated using the pressure difference between the current oil rail pressure and the preset oil rail pressure, or it can be obtained by looking up a table (a data table obtained through multiple experiments). Specifically, due to the compressibility of liquids (the property of a liquid decreasing in volume under pressure is called liquid compressibility; for a liquid with volume V, when the pressure increases by ΔP, the volume decreases by ΔV), this embodiment can calculate the target oil leakage amount based on the pressure difference between the current oil rail pressure and the preset oil rail pressure. The calculation formula can be expressed as:

[0048] ΔV=-ΔP×V×k

[0049] Where ΔV can represent the target oil discharge volume; ΔP can represent the pressure difference between the current oil rail pressure and the preset oil rail pressure; V can represent the volume of the common rail; and k can represent the volume compression coefficient.

[0050] S11. Determine the number of dynamic leaks required to achieve the target oil discharge volume through dynamic leaking. If the number of dynamic leaks is greater than the target number, proceed to step S12.

[0051] S12. Use dynamic leakage method and target injection method to drain oil.

[0052] Dynamic leakage, also known as dry injection, refers to the method of releasing pressure by opening the ball valve at the injector head, connecting the high and low pressure oil circuits inside the injector. The target number refers to the limited number of times dynamic leakage can be performed. This number can be a preset fixed value or the maximum number of times dynamic leakage can be performed (determined based on the injector's hardware). The calculated value of the dynamic leakage count can be an integer or a decimal. When the dynamic leakage count is a decimal, it can be directly rounded up to obtain an integer value, for example, 4.1 can be rounded up to 5; alternatively, it can be determined directly using the Ceilling function. The syntax of the Ceilling function is (number, significance), where number represents the value to be rounded and significance represents the rounding base. For example, Ceilling(3.1, 2) = 4 means rounding 3.1 to the nearest multiple of 3.1, resulting in 4.

[0053] The target injection method can be a combination of multiple injection methods, including pre-injection, main injection, and post-injection. Pre-injection refers to the injection of fuel into the cylinder before the main injection, often used to stabilize the pressure rise rate. Main injection refers to the injection of fuel after the pre-injection, when the fuel pressure rises above the pre-injection pressure, causing the injection needle valve to move upwards and initiating the injection action. Post-injection refers to the injection of fuel into the cylinder after the piston reaches top dead center during compression, often used to improve emissions and increase exhaust temperature. In this embodiment, the number of pre-injections, main injections, and post-injections is not limited to one; multiple injections can be performed. Multiple injections allow for a stepped decrease in fuel rail pressure, effectively improving combustion noise. Specifically, the combination of pre-injection, main injection, and post-injection can be calibrated on a test bench based on engine noise. Under different fuel rail pressure conditions at the same operating point, by setting the number of injections each time (including the number of injections, injection angle, and injection quantity), the engine noise can be effectively kept at a consistent level, reducing noise complaints.

[0054] This embodiment first uses dynamic leakage to relieve pressure. Once the maximum number of dynamic leakage attempts has been reached, fuel injection can be further performed using a target injection method to increase the engine's internal pressure and accelerate the fuel leakage process. Specifically, this embodiment first determines the number of dynamic leakage attempts based on the target fuel leakage amount. If the number of dynamic leakage attempts exceeds the target number, fuel leakage can then be further performed using the target injection method.

[0055] Furthermore, if the target fuel leakage volume can be achieved through static leakage before dynamic leakage is implemented, then static leakage can be chosen for pressure relief. Static leakage refers to high-pressure fuel leakage caused by gaps in moving parts within the injector, such as needle valves and ball valves, or within the injector body. Since static leakage is due to the existence of gaps, it can be a continuous process.

[0056] This application provides a method for reducing fuel rail pressure. This method determines the number of dynamic leaks based on the target leakage amount. If this number exceeds the target number, the method can also execute a target injection mode to increase internal pressure and accelerate leakage, thus rapidly reducing the actual rail pressure to the set rail pressure. Therefore, when simple dynamic leaks are insufficient, this method, through a combination of dynamic leaks and target injection modes, can quickly reduce the actual rail pressure and effectively avoid the problem of rough combustion.

[0057] In another method for reducing oil rail pressure provided in the embodiments of this application, Figure 1 Step S11 shown may include steps one through three:

[0058] Step 1: Determine if the vehicle is in the ignition state;

[0059] Step 2: Determine the dynamic leakage amount based on the judgment results;

[0060] Step 3: Determine the number of dynamic leaks based on the dynamic leakage amount.

[0061] Since the vehicle's state can influence the specific pressure relief method, the vehicle's state can be determined before pressure relief to establish the appropriate method. Based on this method, the required dynamic leakage amount for dynamic leakage can then be determined. Specifically, if the vehicle is not in ignition mode, a combination of static and dynamic leakage can be used for pressure relief; if the vehicle is in ignition mode, a combination of static leakage, dynamic leakage, and the target fuel injection method can be used.

[0062] This embodiment determines the dynamic leakage amount through a specific pressure relief method. After determining the dynamic leakage amount, the number of times dynamic leakage is executed can be calculated. Specifically, the unit dynamic leakage amount under the influence of oil leakage influencing factors can be calculated first, and then the number of dynamic leakages can be obtained based on the dynamic leakage amount and the unit dynamic leakage amount.

[0063] Specifically, the dynamic leakage amount can be determined as follows: if the vehicle is not in the ignition state, the dynamic leakage amount is the leakage amount after subtracting the static leakage amount from the target leakage amount, where the static leakage amount is determined based on the factors affecting leakage; if the vehicle is in the ignition state, the dynamic leakage amount is the leakage amount after subtracting the static leakage amount and the first leakage amount from the target leakage amount, where the first leakage amount is the leakage amount of the target injection method.

[0064] The factors influencing oil leakage can be multiple parameters affecting the leakage amount, including engine coolant temperature, fuel temperature, and fuel pressure. The static and dynamic leakage amounts of the injector are highly correlated with fuel pressure, temperature, and the internal structural clearances of the injector (which can be equivalent to engine coolant temperature). Since current technology does not consider the impact of these factors on static and dynamic leakage amounts, to ensure more precise oil leakage control, the unit static and dynamic leakage amounts under the current influencing factors can be calculated in real-time based on engine coolant temperature, fuel temperature, and fuel pressure, serving as a correction for the leakage amount.

[0065] Specifically, the formula for calculating the unit static leakage can be expressed as:

[0066] X J =C WT1 ×C OT1 ×C OP1 ×X J0

[0067] Among them, X J It can represent the unit of static leakage, and its unit can be mm. 3 / s;C WT1 The engine coolant temperature correction factor that can represent static leakage; C OT1 A fuel temperature correction factor that can represent static leakage; C OP1 A fuel pressure correction factor that can represent static leakage; X J0 This can represent the static leakage amount under standard engine coolant temperature, fuel temperature, and fuel pressure. The aforementioned correction coefficients can be known quantities, obtained in advance through component or bench engine testing. Furthermore, the unit static leakage amount can be obtained not only by calculation but also by directly consulting a relationship table. This relationship table can refer to the relationship between the unit static leakage amount and two other leakage influencing factors under a certain fixed leakage influencing factor. For example, this relationship table can be as shown in Table 1 for standard engine coolant temperature:

[0068] Table 1 Relationship Table

[0069] 20 10.5 11.9 13.5 16.9 21.3 22.9 24.9 27.2 40 11.2 12.5 15.4 18.4 22.4 24.7 26.1 28.4 60 12.4 13.9 17.6 19.7 23.6 25.8 26.9 29.2 80 13.6 15.4 18.5 21.5 24.5 26.4 28.3 30.1

[0070] The first row (x) represents fuel pressure, which can be in hPa (hectopascals); the first column (y) on the left represents fuel temperature; and the data in the table can be the static leakage amount in the corresponding unit.

[0071] The formula for calculating the unit dynamic leakage amount can be expressed as:

[0072] X D =C WT2 ×C OT2 ×C OP2 ×X D0

[0073] Among them, X D It can represent the unit of dynamic leakage, and its unit can be mm. 3 / times; C WT2 The engine coolant temperature correction factor can represent the dynamic leakage amount; C OT2 A fuel temperature correction factor that can represent dynamic leakage; C OP2 A fuel pressure correction factor that can represent dynamic leakage; X D0 It can represent the dynamic leakage amount under standard engine water temperature, fuel temperature and fuel pressure. The above correction coefficient can be a known quantity, which can be obtained in advance through component or bench engine tests.

[0074] In another method for reducing oil rail pressure provided in the embodiments of this application, Figure 1 Step S12 shown may include:

[0075] Determine the target fuel injection method that is suitable for the current engine operating conditions;

[0076] Once the target number of executions is dynamically leaked, the target spraying method is used for spraying.

[0077] The current engine operating condition refers to the engine's current state and may involve multiple operating parameters, including engine speed, current fuel rail pressure, and set fuel rail pressure. This embodiment can determine the target fuel injection method suitable for the current engine operating condition based on these parameters.

[0078] Specifically, under the current operating conditions, this embodiment first determines the combustion noise and rail pressure reduction per unit for each injection mode combination, then selects one injection mode from these combinations and determines it as the target injection mode that meets the current engine operating conditions. When selecting an injection mode, the required injection mode can be directly obtained by consulting a table using the combustion noise and rail pressure reduction per unit as indicators under the operating conditions. Specifically, the combustion noise status and the specific value of the rail pressure reduction per unit for each injection mode combination can be determined separately. By comparing them, the injection mode combination with no complaints about combustion noise and a better rail pressure reduction per unit is selected. For example, see the injection mode information table in Table 2:

[0079] Table 2. Injection Methods

[0080]

[0081] If the engine speed is 750 r / min, the fuel rail pressure is set to 350 bar, and the current fuel rail pressure is 500 bar, under this operating condition, there are two fuel injection methods: primary pre-injection and main injection, and secondary pre-injection and main injection. The fuel injection method of secondary pre-injection and main injection can be selected because the combustion noise is uncomplaining and the fuel rail pressure is reduced by a large amount under this fuel injection method.

[0082] Of course, the combustion noise weight and rail pressure reduction weight of each injection mode combination can be calculated separately, and the weight value can be used as the selection criterion for the injection mode. The higher the weight value, the more the combustion noise and rail pressure reduction meet the requirements under the sub-operating conditions.

[0083] Therefore, a complete embodiment can be provided, such as Figure 2 The flowchart is shown. When the difference between the current fuel rail pressure and the preset fuel rail pressure is greater than 50 bar (when it is less than 50 bar, the combustion noise can be ignored), fuel rail depressurization can be performed. This embodiment can determine the specific depressurization method according to the vehicle's condition. Specifically:

[0084] If the vehicle is not started, the target oil leakage amount can be calculated first, and it can be determined whether the target oil leakage amount can be achieved through static leakage (compare the target oil leakage amount ΔV with the static leakage amount V). J (size), if possible (ΔV not greater than V) J If static leakage occurs, then static leakage will be performed; otherwise (ΔV is greater than V). J If the remaining target oil leakage amount (static leakage always exists; when static leakage cannot meet the target oil leakage amount, the remaining target oil leakage amount that cannot be timely leaked by static leakage can be considered to be leaked through dynamic leakage) is less than the maximum dynamic leakage amount V of dynamic leakage method.D .

[0085] If the remaining target oil discharge volume (ΔV-V) J ) greater than V D If the maximum number of executions is reached, dynamic leakage will be performed; if the remaining target leakage amount is not greater than V... D Then, the number of times dynamic leaks are executed can be calculated, and dynamic leaks can be executed according to the calculated number of times:

[0086]

[0087] Where N represents the number of times dynamic leakage is performed; ΔV represents the target leakage amount; X D It can represent the unit dynamic leakage amount; V J It can represent static leakage, specifically, V. J The calculation method can be expressed as: V J =X J ×t,X J It can represent the unit static leakage amount, and t can represent time.

[0088] If the vehicle is in the ignition state, the target oil leakage amount can be calculated first, and it can be determined whether the target oil leakage amount can be completed by static leakage (compare the target oil leakage amount ΔV with the static leakage amount V). J (size), if possible (ΔV not greater than V) J If static leakage occurs, then static leakage will be performed; otherwise (ΔV is greater than V). J If the static leakage persists, and static leakage cannot meet the target leakage amount, and the vehicle is in ignition and requires fuel injection to generate power, then the remaining target leakage amount that cannot be timely discharged by static leakage can be discharged through the target injection method. If this is less than the first leakage amount V of the target injection method, then the remaining target leakage amount that cannot be discharged by static leakage in time can be discharged through the target injection method. P .

[0089] If the remaining target oil discharge volume (ΔV-V) J ) not greater than V P If the target injection method is executed to cause leakage, then the leakage can be addressed; if the remaining target leakage volume is greater than V... P Then, a combination of dynamic leakage and target injection methods can be used to perform leakage. The formula for calculating the number of times dynamic leakage is executed can be expressed as:

[0090]

[0091] Where N represents the number of times dynamic leakage is performed; ΔV represents the target leakage amount; X D It can represent the unit dynamic leakage amount; V JV can represent static leakage; P The first leakage amount of the target fuel injection method can be represented by the current engine speed, throttle opening and relation table (MAP).

[0092] If the number of times dynamic leakage is executed is less than the maximum number of times dynamic leakage can be executed, then dynamic leakage can be executed according to the calculated number of times dynamic leakage can be executed; if the number of times dynamic leakage is executed is not less than the maximum number of times dynamic leakage can be executed, then dynamic leakage can be executed according to the maximum number of times dynamic leakage can be executed, and then the target fuel injection method can be executed for further fuel leakage.

[0093] Corresponding to the method for reducing oil rail pressure provided in the embodiments of this application, the embodiments of this application also provide a system for reducing oil rail pressure.

[0094] like Figure 3 As shown in the illustration, this application also provides a system for reducing oil rail pressure, the system comprising:

[0095] The acquisition unit 100 is used to acquire the target oil discharge amount, which is the amount of oil discharge required to reduce the current oil rail pressure to the preset oil rail pressure.

[0096] The determining unit 110 is used to determine the number of dynamic leaks required to achieve the target oil leakage amount through dynamic leakage. If the number of dynamic leaks is greater than the target number, the oil leakage unit is triggered.

[0097] The oil draining unit 120 is used to drain oil using dynamic leakage and target injection methods.

[0098] According to another embodiment of this application, in a system for reducing oil rail pressure, Figure 3 The determining unit 110 shown may include:

[0099] The status judgment subunit is used to determine whether the vehicle is in the ignition state;

[0100] The dynamic leakage determination subunit is used to determine the dynamic leakage based on the judgment result.

[0101] The leakage count determination subunit is used to determine the dynamic leakage count based on the dynamic leakage amount.

[0102] In another system for reducing oil rail pressure according to an embodiment of this application, the aforementioned dynamic leakage determination subunit can be specifically configured as follows:

[0103] If the vehicle is not in the ignition state, the dynamic leakage amount is: the leakage amount after subtracting the static leakage amount from the target leakage amount. The static leakage amount is the static leakage amount determined based on the factors affecting leakage.

[0104] If the vehicle is in the ignition state, the dynamic leakage amount is: the leakage amount after subtracting the static leakage amount and the first leakage amount from the target leakage amount. The first leakage amount is: the leakage amount of the target fuel injection method.

[0105] In another system for reducing oil rail pressure according to an embodiment of this application, the aforementioned leakage count determination subunit may include:

[0106] The unit dynamic leakage calculation subunit is used to calculate the unit dynamic leakage under the influence of oil leakage influencing factors;

[0107] The dynamic leakage count determination subunit is used to obtain the dynamic leakage count based on the dynamic leakage amount and the unit dynamic leakage amount.

[0108] According to another embodiment of this application, in a system for reducing oil rail pressure, Figure 3 The oil draining unit 120 shown may include:

[0109] The fuel injection mode determination subunit is used to determine the target fuel injection mode that is suitable for the current engine operating conditions;

[0110] The fuel injection subunit is used to perform fuel injection using the target fuel injection method after the target number of executions is dynamically leaked.

[0111] In another system for reducing oil rail pressure according to an embodiment of this application, the above-mentioned injection mode determination subunit may include:

[0112] The parameter determination subunit is used to determine the combustion noise and rail pressure reduction per unit for each injection mode combination under the current operating conditions.

[0113] The fuel injection mode selection subunit is used to select a set of fuel injection modes from various combinations of fuel injection modes and determine the target fuel injection mode that is suitable for the current engine operating conditions.

[0114] like Figure 4 As shown, this application provides an electronic device 70, including at least one processor 701, at least one memory 702 connected to the processor 701, and a bus 703; wherein the processor 701 and the memory 702 communicate with each other through the bus 703; the processor 701 is used to call program instructions in the memory 702 to execute the above-described method for reducing oil rail pressure. The electronic device 70 in this document can be a server, PC, PAD, mobile phone, etc.

[0115] This application also provides a readable storage medium storing a computer program thereon, which, when executed by a processor, implements the various steps of any of the above-described methods for reducing oil rail pressure.

[0116] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0117] In a typical configuration, the device includes one or more processors (CPUs), memory, and a bus. The device may also include input / output interfaces, network interfaces, etc.

[0118] Memory may include non-persistent memory in computer-readable storage media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and memory includes at least one memory chip. Memory is an example of a computer-readable medium.

[0119] Computer-readable storage media include both permanent and non-permanent, removable and non-removable media that can store information by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0120] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0121] It should 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. It should also be noted that 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 process, method, article, or apparatus. Unless otherwise specified, 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 the element.

[0122] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the apparatus embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0123] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for reducing oil rail pressure, characterized in that, The methods for reducing oil rail pressure include: Obtain the target oil drain volume, which is the oil drain volume required to reduce the current oil rail pressure to a preset oil rail pressure; The number of dynamic leaks required to achieve the target oil leakage amount through dynamic leakage is determined, wherein it is determined whether the vehicle is in an ignition state; if the target oil leakage amount is greater than the static leakage amount under the influence of static oil leakage factors, the dynamic leakage amount is determined based on the determination result, and the number of dynamic leaks is determined based on the dynamic leakage amount; the dynamic leakage method is air injection. If the number of dynamic leaks exceeds the target number, then the dynamic leak method and the target oil injection method are used for oil leakage, where the target number is the maximum number of times dynamic leaks can be executed. If the target oil leakage amount is not greater than the static leakage amount, then the static leakage method is used for oil leakage.

2. The method for reducing oil rail pressure according to claim 1, characterized in that, The determination of dynamic leakage based on the judgment result includes: If the vehicle is not in the ignition state, the dynamic leakage amount is: the leakage amount after subtracting the static leakage amount from the target leakage amount, where the static leakage amount is determined based on the factors affecting leakage. If the vehicle is in the ignition state, the dynamic leakage amount is: the leakage amount after subtracting the static leakage amount and the first leakage amount from the target leakage amount, where the first leakage amount is: the leakage amount of the target fuel injection method.

3. The method for reducing oil rail pressure according to claim 1, characterized in that, Determining the number of dynamic leaks based on the dynamic leak amount includes: Calculate the unit dynamic leakage volume under the influence of dynamic oil spill influencing factors; The number of dynamic leaks is obtained based on the dynamic leakage amount and the unit dynamic leakage amount.

4. The method for reducing oil rail pressure according to claim 1, characterized in that, The method of using the dynamic leakage method and the target injection method to drain oil includes: Determine the target fuel injection method that is suitable for the current engine operating conditions; After the target number of times is dynamically leaked, the target oil spraying method is used for oil spraying.

5. The method for reducing oil rail pressure according to claim 4, characterized in that, Determining the target fuel injection method that conforms to the current engine operating conditions includes: Under the current operating conditions, determine the combustion noise and rail pressure reduction per unit for each combination of fuel injection methods; Select one injection method from the various combinations of injection methods and determine it as the target injection method that meets the current engine operating conditions.

6. A system for reducing oil rail pressure, characterized in that, The system for reducing oil rail pressure includes: The acquisition unit is used to acquire the target oil discharge amount, which is the amount of oil discharge required to reduce the current oil rail pressure to a preset oil rail pressure. A determining unit is used to determine the number of dynamic leaks required to achieve the target oil leakage amount through dynamic leakage, wherein it determines whether the vehicle is in an ignition state; if the target oil leakage amount is greater than the static leakage amount under the influence of static oil leakage factors, the dynamic leakage amount is determined according to the determination result; the number of dynamic leaks is determined according to the dynamic leakage amount, wherein the dynamic leakage method is air injection; if the number of dynamic leaks is greater than the target number, the first oil leakage unit is triggered; if the target oil leakage amount is not greater than the static leakage amount, the second oil leakage unit is triggered. The first oil draining unit is used to drain oil using the dynamic leaking method and the target oil injection method, wherein the target number is the maximum number of times the dynamic leaking is executed; The second oil draining unit is used to drain oil using a static leakage method.

7. An electronic device, characterized in that, Including memory and processor; The memory is used to store programs; The processor is configured to execute the program to implement the steps of the method for reducing oil rail pressure as described in any one of claims 1-5.

8. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for reducing oil rail pressure as described in any one of claims 1-5.

Images