An air flow determination method, device, vehicle and storage medium

Abstract

The application discloses an air flow determination method and device, a vehicle and a storage medium. The method comprises the following steps: determining the actual flow through the throttle valve according to the estimated throttle valve front and back pressure ratio and the estimated throttle valve opening degree of the natural gas engine; determining the estimated intake flow corresponding to the intake pressure estimation value; and determining the weighted result of the actual flow and the estimated intake flow as the intake flow estimation value of air. The application determines the intake flow estimation value of air according to the weighted result of the actual flow and the estimated intake flow, solves the problem of the mismatch between the intake amount and the oil amount of the engine under the transient operating condition, and thus realizes the stable control of the engine under the whole operating process, and meets the vehicle power performance and the emission regulations.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle engine, and particularly relates to an air flow determination method and device, a vehicle and a storage medium. BACKGROUND

[0002] Compared with diesel engines of the same displacement, natural gas engines have close power performance, obvious environmental protection advantages and are more likely to meet increasingly strict emission regulations.

[0003] In the electronic control system of a natural gas engine, the control of the gas path, especially the control of the throttle valve, is crucial to the demand torque output of the entire system with high response and high stability. Only when the air and natural gas flow is within a reasonable range, can the stable combustion of the natural gas engine be ensured, and the vehicle power performance and emission regulations can be met.

[0004] At present, for a general port injection engine, air intake is completed at the bottom dead center of the intake stroke, and fuel quantity calculation is completed before that. If the engine is in a sharply changing transient state, the intake quantity of the next cycle must be roughly estimated before fuel quantity calculation, and then target fuel quantity calculation is performed according to the intake quantity, otherwise problems such as poor response in transient state or mismatch between intake quantity and fuel quantity in transient state will exist. SUMMARY

[0005] The present application provides an air flow determination method, device, vehicle and storage medium to solve the problem of mismatch between intake quantity and fuel quantity of the engine in transient state.

[0006] In a first aspect, an air flow determination method is provided, comprising:

[0007] determining an actual flow through the throttle valve according to the estimated throttle valve pressure ratio before and after the throttle valve and the estimated throttle valve opening degree in the natural gas engine;

[0008] determining an estimated intake flow corresponding to the estimated intake pressure;

[0009] determining an intake flow estimate of air as a weighted result of the actual flow and the estimated intake flow.

[0010] Optionally, the determination of the actual flow through the throttle valve according to the estimated throttle valve pressure ratio before and after the throttle valve and the estimated throttle valve opening degree in the natural gas engine comprises:

[0011] determining the estimated throttle valve pressure ratio before and after the throttle valve and the estimated throttle valve opening degree in the natural gas engine

[0012] determining a standard flow through the throttle valve corresponding to the estimated throttle valve pressure ratio and the estimated throttle valve opening degree;

[0013] convert the standard flow into an actual flow through the throttle valve.

[0014] Optionally, the estimated throttle valve pressure ratio is determined by:

[0015] determining an intake pressure estimate value;

[0016] determining the intake pressure estimate value and the boost pressure ratio as the estimated throttle valve pressure ratio.

[0017] Optionally, the intake pressure estimate value is determined based on the current intake pressure, the previous intake pressure and a pressure estimation coefficient calibration value.

[0018] Optionally, the estimated intake flow corresponding to the intake pressure estimate value is determined by:

[0019] determining an estimated intake charge corresponding to the intake pressure estimate value;

[0020] converting the estimated intake charge into an estimated intake flow.

[0021] Optionally, the estimated intake charge corresponding to the intake pressure estimate value is determined by:

[0022] multiplying the difference between the intake pressure estimate value and the in-cylinder gas partial pressure value by a pressure-to-charge conversion slope to obtain an in-cylinder gas charge;

[0023] subtracting the natural gas charge from the in-cylinder gas charge to obtain an estimated intake charge, the estimated intake charge being an estimated in-cylinder air charge.

[0024] Optionally, the estimated intake flow is determined by:

[0025] multiplying the ratio of the engine speed and a conversion coefficient by the estimated intake charge to determine the estimated intake flow.

[0026] In a second aspect, an air flow determination device is provided, comprising:

[0027] a first determination module configured to determine an actual flow through a throttle valve in a natural gas engine based on an estimated throttle valve pressure ratio and an estimated throttle valve opening degree of the throttle valve;

[0028] a second determination module configured to determine an estimated intake flow corresponding to an intake pressure estimate value;

[0029] a third determination module configured to determine an air intake flow estimate value by weighting the actual flow and the estimated intake flow.

[0030] In a third aspect, an embodiment of the present application provides a vehicle, the vehicle comprising:

[0031] at least one processor; and

[0032] a memory connected with the at least one processor; wherein

[0033] the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the air flow determination method according to any one of the embodiments of the present application.

[0034] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, the computer readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the air flow determination method according to any one of the embodiments of the present application when executed by the processor.

[0035] The technical scheme of the embodiment of the present application determines the actual flow through the throttle valve according to the estimated throttle valve pressure ratio before and after the throttle valve and the estimated throttle valve opening degree of the natural gas engine; determines the estimated intake air flow corresponding to the intake pressure estimate; and determines the weighted result of the actual flow and the estimated intake air flow as the intake air flow estimate of air, thereby solving the problem of mismatch between the intake air and the oil quantity of the engine under transient conditions, so as to realize stable control of the engine under the entire operation process, and meet the vehicle power performance and emission regulations

[0036] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0038] Figure 1 A flow chart of an air flow determination method provided for the first embodiment of the present application;

[0039] Figure 2 A flow chart of an air flow determination method provided for the second embodiment of the present application;

[0040] Figure 3 A schematic diagram of a natural gas engine air control system provided for the second embodiment of the present application;

[0041] Figure 4 Fig. 1 is a structural schematic diagram of an air flow determination device according to an embodiment of the present application.

[0042] Figure 5 Fig. 2 is a structural schematic diagram of a vehicle that can be used to implement an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the personnel in the technical field without making creative efforts should belong to the protection scope of the present application.

[0044] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] Embodiment One

[0046] Figure 1 Fig. 1 is a flowchart of an air flow determination method according to an embodiment of the present application. The embodiment can be applicable to estimating the air flow of a natural gas engine. The method can be performed by an air flow determination device, which can be realized in the form of hardware and / or software. The air flow determination device can be configured in a vehicle or in a natural gas engine of the vehicle. As shown in the figure, the method comprises: Figure 1

[0047] S110, determining the actual flow through the throttle valve according to the estimated throttle valve pre-post pressure ratio and the estimated throttle valve opening degree of the throttle valve in the natural gas engine.

[0048] ​The intake air flow of the natural gas engine can be determined by the following steps: S110, determining the estimated intake air flow of the natural gas engine; S120, determining the estimated intake air flow corresponding to the estimated intake air pressure; S130, determining the estimated intake air flow of the natural gas engine by weighting the actual flow and the estimated intake air flow.

[0049] In the embodiment, the actual air flow through the throttle valve can be determined based on the estimated throttle valve pressure ratio and the estimated throttle valve opening degree.

[0050] S120, determining the estimated intake air flow corresponding to the estimated intake air pressure.

[0051] The estimated intake air pressure can refer to the estimated intake air pressure at the next moment; and the estimated intake air flow can refer to the estimated intake air flow at the next moment.

[0052] In one embodiment, the estimated intake air pressure and the corresponding estimated intake air flow are determined based on the intake air pressure sensor.

[0053] S130, determining the estimated intake air flow of the natural gas engine by weighting the actual flow and the estimated intake air flow.

[0054] The estimated intake air flow of the natural gas engine can be determined by the following steps: S110, determining the estimated intake air flow of the natural gas engine; S120, determining the estimated intake air flow corresponding to the estimated intake air pressure; S130, determining the estimated intake air flow of the natural gas engine by weighting the actual flow and the estimated intake air flow.

[0055] In the embodiment, the actual air flow through the throttle valve can be determined based on the estimated throttle valve pressure ratio and the estimated throttle valve opening degree.

[0056] Embodiment two

[0057] Figure 2 The technical scheme of the embodiment is further refined on the basis of the above-mentioned embodiment. As shown in FIG. 2, the technical scheme of the embodiment comprises the following steps: Figure 2As shown, the method comprises:

[0058] S210, determining an estimated throttle pressure ratio and an estimated throttle opening degree in the natural gas engine;

[0059] The estimated throttle pressure ratio can be determined by calculating the ratio of the estimated intake pressure at the next moment and the intake pressure at the last moment. Specifically, the intake pressure can be detected by an intake pressure sensor. The throttle opening degree estimated value is obtained by simulating the response characteristics under the throttle step signal by passing the throttle opening degree control value through two low-pass filters and a delay module. The throttle opening degree control value can be the value for controlling the throttle opening degree, which can be measured by a dedicated detector.

[0060] S220, determining the standard flow through the throttle corresponding to the estimated throttle pressure ratio and the estimated throttle opening degree;

[0061] The standard flow can refer to the air flow through the throttle under standard conditions, which can be obtained by querying the throttle standard flow characteristic chart.

[0062] In this embodiment, the standard flow through the throttle corresponding to the estimated throttle pressure ratio and the estimated throttle opening degree can be obtained by querying the throttle standard flow characteristic chart. The throttle standard flow characteristic chart can include a plurality of estimated throttle pressure ratios, estimated throttle opening degrees and standard flows that have a corresponding relationship.

[0063] S230, converting the standard flow into an actual flow through the throttle.

[0064] When converting the standard flow into the actual flow, the standard flow can be brought into a conversion formula, which is not limited here, such as a conversion formula representing the correlation between the standard flow, the correction coefficient, the Saint-Venant coefficient and the actual flow. The correction coefficient can include a temperature correction coefficient and a pressure correction coefficient.

[0065] Specifically, the conversion formula of the standard flow and the actual flow is:

[0066]

[0067] Where Nor_Flw is the actual flow, Std_Flw is the standard flow obtained by querying the table, P_Fac is the pressure correction coefficient, T_Fac is the temperature correction coefficient, and SANVANT_Fac is the Saint-Venant coefficient.

[0068] In the embodiment, the standard flow through the throttle valve is converted into the actual flow through the throttle valve by the conversion formula of the standard flow and the actual flow, and the obtained actual flow is made more accurate by the correction coefficient.

[0069] Optionally, the estimated throttle valve pressure ratio is determined by:

[0070] The intake pressure estimate value is determined.

[0071] The intake pressure estimate value can be the estimated intake pressure value at the next moment, which can be calculated by detecting the pressure sensor.

[0072] The ratio of the intake pressure estimate value to the boost pressure is determined as the estimated throttle valve pressure ratio.

[0073] The boost pressure can be represented as the intake pressure at the last moment, which can be monitored by the boost pressure sensor. Specifically, the estimated throttle valve pressure ratio calculation formula is:

[0074] Ratio=Map_Prdc / Tip

[0075] Wherein, Ratio is the estimated throttle valve pressure ratio, Map_Prdc is the estimated intake pressure, and Tip is the boost pressure, i.e. the intake pressure of the throttle valve at the last moment.

[0076] Optionally, the intake pressure estimate value is determined based on the current intake pressure, the last intake pressure, and the pressure estimation coefficient calibration quantity.

[0077] Wherein, the current intake pressure can be the air intake pressure value measured by the intake pressure sensor at the current moment; the last intake pressure can be monitored by the boost pressure sensor; and the pressure estimation coefficient calibration quantity can be the calibrated pressure estimation coefficient.

[0078] Specifically, the intake pressure estimate calculation formula is:

[0079] Map_Prdc=Map+(Map-Map_Lst)*Prdc_Fac

[0080] Wherein, Map_Prdc is the estimated intake pressure, Map is the current intake pressure, Map_Lst is the last intake pressure, and Prdc_Fac is the pressure estimation coefficient calibration quantity.

[0081] In the embodiment, the difference between the current intake pressure and the last intake pressure is multiplied by the pressure estimation coefficient calibration quantity, and then the current intake pressure is added to determine the estimated intake pressure at the next moment.

[0082] S240, determining an estimated intake charge corresponding to the intake pressure estimation value;

[0083] The intake charge refers to the amount of air or combustible mixture entering the cylinder during the intake process. In this embodiment, the estimated intake charge refers to the estimated amount of air entering the cylinder during the intake process.

[0084] Generally, the greater the intake charge in the cylinder, the greater the intake pressure, and there is a correlation between the two. Specifically, the estimated intake charge corresponding to the intake pressure estimation value can be determined by the correlation between the intake charge and the intake pressure.

[0085] S250, converting the estimated intake charge into an estimated intake flow rate.

[0086] In this embodiment, the estimated intake charge can be converted into an estimated intake flow rate through the conversion relationship between the intake charge and the intake flow rate.

[0087] Optionally, the determination of the estimated intake charge corresponding to the intake pressure estimation value comprises:

[0088] multiplying the difference between the intake pressure estimation value and the in-cylinder gas partial pressure value by a pressure-to-charge conversion slope to obtain an in-cylinder gas charge;

[0089] subtracting the natural gas charge from the in-cylinder gas charge to obtain the estimated intake charge, the estimated intake charge being the estimated charge of in-cylinder air.

[0090] The in-cylinder gas partial pressure value refers to the pressure value of the residual gas occupying the same volume of in-cylinder mixture at the same temperature. The pressure-to-charge conversion slope is used to convert pressure to charge. The in-cylinder gas charge refers to the mixed amount of air and natural gas entering the cylinder during the intake process. The natural gas charge refers to the amount of natural gas entering the cylinder during the intake process. The estimated charge of in-cylinder air refers to the estimated amount of air entering the cylinder during the intake process.

[0091] Specifically, the estimated intake charge calculation formula is:

[0092] AgCg_Prdc = (Map_Prdc - Ofs_P_Cly) * Fac_P_Cg

[0093] Wherein, AgCg_Prdc is the estimated intake charge, Map_Prdc is the calculated intake pressure estimation value, Ofs_P_Cly is the cylinder residual gas partial pressure, Fac_P_Cg is the pressure-to-charge conversion slope. Specifically, the cylinder residual gas partial pressure and the pressure-to-charge conversion slope can be obtained by the intake pressure sensor and the intake flow sensor, and the bench test calibrated intake flow and intake pressure relationship.

[0094] Optionally, the converting the estimated intake charge into the estimated intake flow includes:

[0095] The product of the ratio of the engine speed and the conversion coefficient and the estimated intake charge is determined as the estimated intake flow.

[0096] Wherein, the engine speed can be pre-set or measured by the speed sensor, and the embodiment does not limit this; the conversion coefficient can be the conversion coefficient of charge and flow, which can be determined according to the engine displacement;

[0097] Wherein, the charge calculation formula is:

[0098]

[0099] Wherein, m l is the actual fresh intake flow, m0 is the standard intake flow, nmot is the engine speed, V h is the engine displacement;

[0100] After simplification, we get:

[0101]

[0102] The engine displacement V h is brought in, and the conversion coefficient A of charge and flow can be obtained.

[0103] In the embodiment, the calculated estimated intake charge is converted into the estimated intake flow through the conversion formula of intake flow and intake charge.

[0104] S260, the weighted result of the actual flow and the estimated intake flow is determined as the intake flow estimation value of air.

[0105] In this embodiment, the actual flow through the throttle valve is determined by table lookup; the estimated intake charge is calculated according to the intake pressure sensor, the boost pressure sensor, etc., the estimated intake charge is converted into estimated intake flow by a conversion formula, and the actual flow and the estimated intake flow are weighted and summed according to the corresponding weighting coefficients to determine the final air intake flow estimation value, thereby solving the problem of mismatch between the intake and the oil in the transient state of the engine, and realizing stable control of the engine in the entire running process, meeting the vehicle power performance and emission regulations.

[0106] Exemplary, Figure 3 A natural gas engine air control system schematic diagram is provided for the second embodiment of the application; as Figure 3 shown, which includes an engine 1, fresh air 2, natural gas 3, exhaust gas 4, pressure relief valve 5, throttle valve 6, mixer 7, waste gas valve 8, variable geometry turbocharger (VGT) 9, three-way catalyst 10, air flow sensor 11, temperature sensor 12, pressure sensor 13, temperature sensor 14, pressure sensor 15. The working steps of the natural gas engine are as follows:

[0107] 1, fresh air 2 (i.e. air) enters the turbocharger 9 (i.e. VGT) to increase the fresh air flow, and then enters the intake intercooler to reduce the temperature of the fresh air;

[0108] 2, the temperature and pressure of the fresh air are detected by the temperature sensor 14 and the pressure sensor 15, and the flow of the fresh air at this point is detected by the air flow sensor 11;

[0109] 3, then the flow and pressure of the fresh air are controlled by the throttle valve 6 (i.e. throttle valve);

[0110] 4, the natural gas 3 is injected into the intake port through the natural gas nozzle, and the natural gas is mixed with the fresh air through the mixer 7;

[0111] 5, the temperature and pressure of the intake pipe are monitored by the temperature sensor 12 and the pressure sensor 13, and then the mixed gas enters the cylinder to work;

[0112] 6, after the work is completed, the exhaust gas is discharged from the left side pipe;

[0113] 7, under normal circumstances, the waste gas valve 8 is in a closed state to input the exhaust gas into the VGT to speed up the entry of fresh air;

[0114] 8, when the intake boost is too large and too much fresh air is not needed, the waste gas valve 8 is appropriately opened to make some exhaust gas flow out;

[0115] 9. The exhaust gas flows out through the three-way catalyst 10.

[0116] Embodiment three

[0117] Figure 4 A structure schematic diagram of an air flow determination device provided for embodiment three of the present application.

[0118] As Figure 4 shown, the device comprises:

[0119] A first determination module 310, configured to determine an actual flow through a throttle valve in a natural gas engine according to an estimated throttle valve pressure ratio before and after the throttle valve and an estimated throttle valve opening degree;

[0120] A second determination module 320, configured to determine an estimated intake flow corresponding to an estimated intake pressure;

[0121] A third determination module 330, configured to determine a weighted result of the actual flow and the estimated intake flow as an estimated intake flow value of air.

[0122] Optionally, the first determination module 310 comprises:

[0123] A first determination unit, configured to determine an estimated throttle valve pressure ratio before and after a throttle valve in a natural gas engine and an estimated throttle valve opening degree

[0124] A second determination unit, configured to determine a standard flow through the throttle valve corresponding to the estimated throttle valve pressure ratio and the estimated throttle valve opening degree;

[0125] A first conversion unit, configured to convert the standard flow into the actual flow through the throttle valve.

[0126] Optionally, the first determination unit comprises:

[0127] A first determination sub-unit, configured to determine an estimated intake pressure;

[0128] A second determination sub-unit, configured to determine a ratio of the estimated intake pressure to a boost pressure as the estimated throttle valve pressure ratio.

[0129] Optionally, the estimated intake pressure is determined based on a current intake pressure, a previous intake pressure and a pressure estimation coefficient calibration quantity.

[0130] Optionally, the second determination module 320 comprises:

[0131] A third determination unit, configured to determine an estimated intake charge corresponding to the estimated intake pressure;

[0132] A second conversion unit is configured to convert the estimated intake charge into an estimated intake flow rate.

[0133] Optionally, the third determining unit is specifically configured to:

[0134] The difference between the estimated intake pressure and the in-cylinder gas partial pressure is multiplied by a pressure-to-charge conversion slope to obtain an in-cylinder gas charge.

[0135] The in-cylinder gas charge is subtracted from the natural gas charge to obtain an estimated intake charge, which is the estimated charge of in-cylinder air.

[0136] Optionally, the second conversion unit is specifically configured to:

[0137] The product of the ratio of the engine speed to the conversion coefficient and the estimated intake charge is determined as the estimated intake flow rate.

[0138] The air flow determination device provided in the embodiments of the present application can perform the air flow determination method provided in any of the embodiments of the present application, and has the corresponding function modules and beneficial effects of the execution method.

[0139] Embodiment Four

[0140] Figure 5 A structural diagram of a vehicle 10 that can be used to implement embodiments of the present application is shown. The vehicle includes a representation of a variety of forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent a variety of mobile devices, such as personal digital assistants, cellular telephones, smart phones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit implementations of the applications described and / or claimed in this document.

[0141] As shown in Figure 5 The vehicle 10 includes at least one processor 11, and a memory, such as a Read-Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., which is in communication with the at least one processor 11, wherein the memory stores a computer program executable by the at least one processor 11, and the computer program is executed by the at least one processor 11 to enable the at least one processor 11 to perform the air flow determination method provided by the present application.

[0142] The processor 11 can perform various appropriate actions and processes in accordance with a computer program stored in a read only memory (ROM) 12 or a computer program loaded from the storage unit 18 into a random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the vehicle 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0143] A plurality of components in the vehicle 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, and the like; an output unit 17, such as various types of displays, a speaker, and the like; a storage unit 18, such as a magnetic disk, an optical disk, and the like; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, and the like. The communication unit 19 allows the vehicle 10 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0144] The processor 11 can be various general and / or special purpose processing components having processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal process (DSP), and any appropriate processor, controller, microcontroller, and the like. The processor 11 performs various methods and processes described above, such as the air flow rate determination method.

[0145] In some embodiments, the air flow rate determination method can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the vehicle 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the air flow rate determination method described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the air flow rate determination method by any other appropriate means, such as by means of firmware.

[0146] The various embodiments of the systems and techniques described above can be implemented in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), an application specific standard product (ASSP), a system on chip (SOC), a complex programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0147] Computer programs used to implement the air flow determination methods of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program running on the processor implements the functions / operations specified in the flow charts and / or block diagrams. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as part of a standalone software package, and partially on a remote machine or server, or entirely on a remote machine or server.

[0148] In the context of the present application, the computer readable storage medium stores computer instructions for causing a processor to implement the air flow determination method provided by the present application. The computer readable storage medium can be a tangible medium which can contain or store the computer program for use by or in connection with the instruction execution system, apparatus, or device. The computer readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium can be a machine readable signal medium. More specific examples of the machine readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0149] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a Cathode Ray Tube (CRT) or a Liquid Crystal Display (LCD) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0150] The systems and techniques described herein can be implemented in a computing system that includes a back end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front end component, e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described herein, or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0151] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and virtual private server (VPS) services.

[0152] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present disclosure. For example, the steps recited in the present disclosure can be performed in parallel, in series, or in a different order, as long as the desired results of the technical solutions of the present disclosure are achieved, and the present disclosure is not limited herein.

[0153] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An air flow rate determination method characterized by, The method comprises: determining an actual flow rate through the throttle valve according to an estimated throttle valve pressure ratio before and after the throttle valve and an estimated throttle valve opening degree in a natural gas engine; determining an estimated intake air flow rate corresponding to an estimated intake air pressure; The method comprises: determining an estimated intake air flow rate corresponding to an estimated intake air pressure; The method comprises: determining an estimated intake air flow rate corresponding to an estimated intake air pressure; The method comprises:

2. The method of claim 1, wherein, multiplying a difference between the estimated intake air pressure and an in-cylinder gas partial pressure value by a pressure-to-charge conversion slope to obtain an in-cylinder gas charge amount; and subtracting a natural gas charge amount from the in-cylinder gas charge amount to obtain an estimated intake air charge amount, the estimated intake air charge amount being an estimated in-cylinder air charge amount; The method comprises: multiplying a ratio of an engine speed to a conversion coefficient by the estimated intake air charge amount to determine an estimated intake air flow rate. The method comprises:

3. The method of claim 2, wherein, determining an intake air flow rate of air by weighting the actual flow rate and the estimated intake air flow rate. The method comprises: determining an estimated throttle valve pressure ratio before and after the throttle valve and an estimated throttle valve opening degree in a natural gas engine; 4. The method according to claim 1 or 3, characterized in that, determining a standard flow rate through the throttle valve corresponding to the estimated throttle valve pressure ratio before and after the throttle valve and the estimated throttle valve opening degree; 5. An air flow determination device, characterized by converting the standard flow rate into an actual flow rate through the throttle valve. The method comprises: determining an estimated intake air pressure; determining an estimated throttle valve pressure ratio before and after the throttle valve by multiplying a ratio of the estimated intake air pressure to a supercharging pressure. The estimated intake air pressure is determined based on a current intake air pressure, a previous intake air pressure, and a pressure estimation coefficient calibration value. The method comprises: a first determining module configured to determine an actual flow rate through the throttle valve according to an estimated throttle valve pressure ratio before and after the throttle valve and an estimated throttle valve opening degree in a natural gas engine; 6. A vehicle characterized by comprising: a second determining module configured to determine an estimated intake air flow rate corresponding to an estimated intake air pressure; a third determining module configured to determine an intake air flow rate of air by weighting the actual flow rate and the estimated intake air flow rate. The second determining module comprises: a third determining unit configured to determine an estimated intake air charge amount corresponding to an estimated intake air pressure; multiply a difference between the estimated intake air pressure and an in-cylinder gas partial pressure value by a pressure-to-charge conversion slope to obtain an in-cylinder gas charge amount; and subtract a natural gas charge amount from the in-cylinder gas charge amount to obtain an estimated intake air charge amount, the estimated intake air charge amount being an estimated in-cylinder air charge amount; a second converting unit configured to convert the estimated intake air charge amount into an estimated intake air flow rate; and multiply a ratio of an engine speed to a conversion coefficient by the estimated intake air charge amount to determine an estimated intake air flow rate. The vehicle comprises: at least one processor; and a memory connected to the at least one processor in communication; wherein The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the air flow determination method of any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for causing a processor to implement the air flow determination method of any one of claims 1-4 when executed.

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