Method, device and equipment for determining negative pressure of engine intake

Abstract

The application discloses a method, device and equipment for determining engine intake negative pressure, to solve the problem of inaccurate engine intake negative pressure identification in the related art. The current speed of the engine is determined to determine the intake flow of the engine; the diameter of the air inlet pipe at the position of the pressure sensor and the intake flow are used to determine the air flow rate at the position of the pressure sensor, and the dynamic pressure of the air at the position of the pressure sensor is determined based on the air flow rate; after it is determined that the dynamic pressure is greater than a preset dynamic pressure threshold, the intake negative pressure collected by the pressure sensor is adjusted to be increased based on the dynamic pressure, and the adjusted intake negative pressure is obtained. The intake negative pressure obtained by the embodiment of the application is more accurate, the clogging degree of the air filter can be more accurately measured based on the adjusted intake negative pressure value, accurate data reference can be provided for the engine control unit, and the accuracy and safety of engine control are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, and in particular to a method, device and equipment for determining engine intake negative pressure. BACKGROUND

[0002] In related technologies, to prevent the air filter of an engine from being blocked or the resistance of an intake pipeline being too large, a pressure sensor is generally added after the air filter to monitor and measure the intake negative pressure after the air filter and determine whether the air filter is blocked. For some engines, the intake pipeline or the inner diameter of the air filter interface may be small due to the limitation of the overall arrangement space of the engine, resulting in a large gas flow rate after the air filter and a low intake negative pressure determined by the pressure sensor. Therefore, the intake negative pressure value measured by the pressure sensor at this time is not accurate for measuring the blocking condition of the air filter.

[0003] Therefore, there is a lack of a method for more accurately determining engine intake negative pressure in related technologies. SUMMARY

[0004] The present application aims to provide a method, device and equipment for determining engine intake negative pressure to solve the problem of inaccurate engine intake negative pressure identification in related technologies.

[0005] In a first aspect, the present application provides a method for determining engine intake negative pressure, the method comprising:

[0006] determining the intake flow rate of the engine according to the current speed of the engine;

[0007] determining the air flow rate at the position of the pressure sensor based on the diameter of the air feeding pipeline at the position of the pressure sensor and the intake flow rate, and determining the dynamic pressure of the air at the position of the pressure sensor based on the air flow rate; wherein the pressure sensor is located inside an air feeding pipeline connected with an air filter and an engine, and the air filter is used to filter the air entering the engine;

[0008] if the determined dynamic pressure is greater than a preset dynamic pressure threshold, increasing the intake negative pressure collected by the pressure sensor based on the dynamic pressure to obtain an adjusted intake negative pressure.

[0009] In a possible implementation, the method for determining the corresponding intake flow rate according to the current speed of the engine comprises:

[0010] determining the engine speed interval corresponding to the current speed from a pre-established corresponding relationship between engine speed intervals and intake flow rates;

[0011] Determine the corresponding intake flow based on the engine speed interval; the pre-established corresponding relationship between the engine speed interval and the intake flow is determined by acquiring the intake flow under each engine speed interval through performance load test.

[0012] In a possible implementation, before determining the intake flow of the engine according to the current engine speed, the method further comprises:

[0013] Determine the maximum intake flow from the pre-established corresponding relationship between the engine speed interval and the intake flow;

[0014] Determine the air flow rate of the pressure sensor position under the maximum intake flow based on the diameter of the air supply pipe at the pressure sensor position and the maximum intake flow;

[0015] Determine the dynamic pressure of the air at the pressure sensor position under the maximum intake flow based on the air flow rate.

[0016] In a possible implementation, after determining the dynamic pressure of the air at the pressure sensor position under the maximum intake flow, the method further comprises:

[0017] If the dynamic pressure under the maximum intake flow is greater than the preset dynamic pressure threshold, perform the step of determining the intake flow of the engine according to the current engine speed;

[0018] If the dynamic pressure under the maximum intake flow is less than or equal to the preset dynamic pressure threshold, determine that the intake negative pressure collected by the pressure sensor is not adjusted, and determine that the step of determining the intake flow of the engine according to the current engine speed is not performed.

[0019] In a possible implementation, before increasing the intake negative pressure collected by the pressure sensor based on the dynamic pressure, the method further comprises:

[0020] Acquire a plurality of intake negative pressures of a plurality of working cycles of the engine, and take the average value of the plurality of intake negative pressures as the intake negative pressure collected by the pressure sensor; the working cycle of the engine includes the process from intake to exhaust of the engine, and each working cycle corresponds to an intake negative pressure.

[0021] In a possible implementation, the increasing the intake negative pressure collected by the pressure sensor based on the dynamic pressure comprises:

[0022] Determine the weight corresponding to the dynamic pressure based on the air flow rate of the pressure sensor position;

[0023] Multiply the dynamic pressure by the weight to obtain the adjusted dynamic pressure.

[0024] adding the intake negative pressure collected by the pressure sensor based on the dynamic pressure to obtain an adjusted intake negative pressure.

[0025] In a possible implementation, the method further includes:

[0026] determining a preset intake negative pressure threshold corresponding to the air flow rate at the position of the pressure sensor;

[0027] if the adjusted intake negative pressure is greater than the preset intake negative pressure threshold, determining that the air filter needs to be cleaned and sending an air filter cleaning signal.

[0028] In a second aspect, the application provides a device for determining an intake negative pressure of an engine, the device including:

[0029] an intake flow rate determination module configured to determine an intake flow rate of the engine according to a current rotating speed of the engine;

[0030] a dynamic pressure determination module configured to determine an air flow rate at a position of a pressure sensor based on a diameter of a gas delivery pipe at the position of the pressure sensor and the intake flow rate, and determine a dynamic pressure of air at the position of the pressure sensor based on the air flow rate, wherein the pressure sensor is located inside the gas delivery pipe connecting an air filter and the engine, and the air filter is configured to filter air entering the engine;

[0031] an intake negative pressure determination module configured to, if the determined dynamic pressure is greater than a preset dynamic pressure threshold, increase the intake negative pressure collected by the pressure sensor based on the dynamic pressure to obtain an adjusted intake negative pressure.

[0032] In a possible implementation, the intake flow rate determination module is specifically configured to:

[0033] determine an engine rotating speed interval corresponding to the current rotating speed from a pre-established corresponding relationship between engine rotating speed intervals and intake flow rates;

[0034] determine the corresponding intake flow rate based on the engine rotating speed interval; the pre-established corresponding relationship between engine rotating speed intervals and intake flow rates is determined by acquiring the intake flow rate under each engine rotating speed interval through a performance load test.

[0035] In a possible implementation, before determining the intake flow rate of the engine according to the current rotating speed of the engine, the dynamic pressure determination module is specifically configured to:

[0036] determining the maximum intake flow from a pre-established correspondence between engine speed intervals and intake flow;

[0037] determining an air flow rate at the pressure sensor position under the maximum intake flow based on the diameter of the air intake pipe at the pressure sensor position and the maximum intake flow;

[0038] determining a dynamic pressure of air at the pressure sensor position under the maximum intake flow based on the air flow rate.

[0039] In a possible implementation, after determining the dynamic pressure of air at the pressure sensor position under the maximum intake flow, the device further comprises a judgment module for:

[0040] if the determined dynamic pressure under the maximum intake flow is greater than the preset dynamic pressure threshold, performing the step of determining the intake flow of the engine according to the current speed of the engine;

[0041] if the determined dynamic pressure under the maximum intake flow is less than or equal to the preset dynamic pressure threshold, determining that the intake negative pressure collected by the pressure sensor is not adjusted, and determining that the step of determining the intake flow of the engine according to the current speed of the engine is not performed.

[0042] In a possible implementation, before the intake negative pressure collected by the pressure sensor is adjusted based on the dynamic pressure, the intake negative pressure determination module is further configured to:

[0043] obtain a plurality of intake negative pressures of a plurality of working cycles of the engine, and take an average value of the plurality of intake negative pressures as the intake negative pressure collected by the pressure sensor; the working cycle of the engine includes a process from intake to exhaust of the engine, and each working cycle corresponds to an intake negative pressure.

[0044] In a possible implementation, the intake negative pressure collected by the pressure sensor is adjusted based on the dynamic pressure to obtain an adjusted intake negative pressure, and the intake negative pressure determination module is specifically configured to:

[0045] determine a weight corresponding to the dynamic pressure based on the air flow rate at the pressure sensor position;

[0046] multiply the dynamic pressure by the weight to obtain an adjusted dynamic pressure;

[0047] add the dynamic pressure and the intake negative pressure collected by the pressure sensor to obtain the adjusted intake negative pressure.

[0048] In a possible implementation, the device further comprises a cleaning judgment module for:

[0049] determine a preset intake negative pressure threshold value corresponding to the air flow rate based on the pressure sensor position;

[0050] If the adjusted intake negative pressure is greater than the preset intake negative pressure threshold value, it is determined that the air filter needs to be cleaned, and an air filter cleaning signal is sent.

[0051] In a third aspect, the present application provides an electronic device, comprising:

[0052] a processor and a memory;

[0053] the memory is configured to store instructions executable by the processor;

[0054] the processor is configured to execute the instructions to implement the engine intake negative pressure determination method of any one of the above first aspect.

[0055] In a fourth aspect, the present application provides a computer readable storage medium, when the instructions in the computer readable storage medium are executed by an electronic device, the electronic device can execute the engine intake negative pressure determination method of any one of the above first aspect.

[0056] In a fifth aspect, the present application provides a computer program product, the computer program product comprising: computer program code, when the computer program code is run on a computer, the computer executes the engine intake negative pressure determination method of any one of the above first aspect.

[0057] The technical scheme provided by the embodiments of the present application at least brings the following beneficial effects:

[0058] In the embodiments of the present application, the dynamic pressure of the air is first determined, and then the intake negative pressure collected by the sensor is adjusted to increase when the air dynamic pressure is greater than the preset threshold value, so that the obtained intake negative pressure is more accurate. Based on the adjusted intake negative pressure value, the degree of blockage of the air filter can be more accurately measured, and accurate data reference is provided for the engine control unit, improving the accuracy and safety of engine control and improving the vehicle driving experience.

[0059] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood from the practice of the present application. The purpose and other advantages of the present application can be achieved and obtained by the structure specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings to be introduced below are only some of the embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0061] Figure 1 A schematic diagram of the pressure sensor arrangement provided by the embodiments of the present application is shown in the figure.

[0062] Figure 2 A schematic diagram of the overall flow of the method for determining the engine intake negative pressure provided by the embodiments of the present application is shown in the figure.

[0063] Figure 3 A schematic diagram of the flow of determining the dynamic pressure of air at the position of the pressure sensor under the maximum intake flow provided by the embodiments of the present application is shown in the figure.

[0064] Figure 4 A schematic diagram of the flow of obtaining the adjusted intake negative pressure provided by the embodiments of the present application is shown in the figure.

[0065] Figure 5 A schematic diagram of the structure of the engine intake negative pressure determination device 500 provided by the embodiments of the present application is shown in the figure.

[0066] Figure 6 A schematic diagram of the structure of the electronic device provided by the embodiments of the present application is shown in the figure. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions 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. The described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0068] In addition, in the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" in the text is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0069] Hereinafter, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an implied indication of the number of the technical features indicated. Thus, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0070] The related terms or devices involved in the embodiments of the present application are explained as follows:

[0071] ECU (Electronic Control Unit, electronic control unit).

[0072] Total pressure refers to the total energy possessed by a fluid during its motion, which includes the static pressure and dynamic pressure of the fluid. The total pressure can be regarded as the sum of the dynamic pressure and the static pressure of the fluid at a certain point.

[0073] Static pressure refers to the pressure of a fluid in a static state, that is, the pressure of the fluid on the container wall or the surface of an object. Static pressure is independent of the speed of the fluid and is related only to the density of the fluid and gravity. In fluid flow, static pressure usually decreases with the increase of fluid velocity, because the kinetic energy of the fluid increases and needs to be obtained from the static pressure.

[0074] Dynamic pressure is the pressure caused by the kinetic energy of the fluid. It is a function of the fluid velocity and can be calculated by Bernoulli's equation. The dynamic pressure is proportional to the square of the fluid velocity.

[0075] In the related art, in order to prevent the air filter of the engine from being blocked or the resistance of the air intake pipeline being too large, a pressure sensor is generally added after the air filter to monitor and measure the intake negative pressure after the air filter to determine whether the air filter is blocked. For some engines, the inner diameter of the air intake pipeline or the air filter interface may be small due to the limitation of the overall layout space of the engine, resulting in a large gas flow rate after the air filter, so that the intake negative pressure determined by the pressure sensor is low. Therefore, the intake negative pressure value measured by the pressure sensor at this time cannot accurately measure the blockage of the air filter.

[0076] Therefore, there is a lack of a method for more accurately determining the intake negative pressure of the engine in the related art.

[0077] According to Bernoulli's principle of fluid mechanics, along the flow direction, the flow rate increases, and the static pressure decreases; after the flow rate decreases, the static pressure increases. The smaller the inner diameter of the interface of the air filter and the pipeline connected to the engine or the larger the intake flow rate, the higher the dynamic pressure of the gas, and therefore the lower the static pressure value (i.e. the intake negative pressure) measured by the pressure sensor. Therefore, the static pressure measured by the pressure sensor after the air filter cannot accurately measure the pressure loss (i.e. the blockage) of the air filter itself.

[0078] Therefore, the application provides a method, device and equipment for determining engine intake negative pressure to solve the problem of inaccurate engine intake negative pressure identification in the related art.

[0079] The application concept of the application can be summarized as follows: determining the intake flow of the engine according to the current speed of the engine; determining the air flow rate at the position of the pressure sensor based on the diameter of the air conveying pipe at the position of the pressure sensor and the intake flow, and determining the dynamic pressure of the air at the position of the pressure sensor based on the air flow rate; after determining that the dynamic pressure is greater than a preset dynamic pressure threshold, increasing the intake negative pressure collected by the pressure sensor based on the dynamic pressure to obtain an adjusted intake negative pressure. The application embodiment can determine the dynamic pressure of the air, and increase the intake negative pressure collected by the sensor when the dynamic pressure of the air is greater than a preset threshold, so that the obtained intake negative pressure is more accurate. Based on the adjusted intake negative pressure value, the clogging degree of the air cleaner can be more accurately measured, and accurate data reference can be provided for the engine control unit, so as to improve the accuracy and safety of engine control and improve the vehicle driving experience.

[0080] After introducing the main inventive idea of the application embodiment, the application scenarios to which the technical solution of the application embodiment can be applied will be briefly introduced below. It should be noted that the application scenarios introduced below are only used to illustrate the application embodiment and are not limited. In the specific implementation, the technical solution provided by the application embodiment can be flexibly applied according to actual needs.

[0081] In order to facilitate understanding of the method for determining engine intake negative pressure provided by the application embodiment, the following will further illustrate this in conjunction with the accompanying drawings.

[0082] In a possible implementation, the air cleaner rear pressure sensor measuring point is usually arranged on the air cleaner air outlet or the air cleaner shell, and the air cleaner is used to filter the air entering the engine. Figure 1 The schematic diagram of the pressure sensor located inside the air conveying pipe connecting the air cleaner and the engine. It should be noted that the arrangement of the pressure sensor is not limited to the above Figure 1 The connection structure between the engine and the air cleaner also includes a compressor, an intercooler and the like, and is not limited to the structure described above Figure 1 .

[0083] Based on the arrangement of the pressure sensor Figure 1 , the application provides a method for determining engine intake negative pressure, and the overall process is shown in Figure 2 , including the following contents:

[0084] In step 201, the intake flow of the engine is determined according to the current speed of the engine.

[0085] In a possible implementation, the corresponding intake flow rate is determined according to the current engine speed, which can be implemented as:

[0086] The engine speed interval corresponding to the current speed is determined from the pre-established corresponding relationship between the engine speed interval and the intake flow rate.

[0087] The corresponding intake flow rate is determined based on the engine speed interval.

[0088] The pre-established corresponding relationship between the engine speed interval and the intake flow rate is determined by acquiring the intake flow rate under each engine speed interval through performance load test. For example, the application acquires the intake flow rate under each speed / load through performance load test, takes the speed and its load as the boundary of identifying the intake flow rate, forms a speed / load / intake flow rate MAP, and embeds the MAP data into the ECU or bench data processing program. Taking the speed interval of 0-1000 rpm and the load of 10% as an example, the application will obtain the intake flow rate corresponding to the above speed interval and load by querying the pre-established MAP.

[0089] In step 202, the air flow rate at the pressure sensor position is determined based on the diameter of the air supply pipe at the pressure sensor position and the intake flow rate, and the dynamic pressure of the air at the pressure sensor position is determined based on the air flow rate.

[0090] In a possible implementation, the dynamic pressure of the air at the pressure sensor position is determined based on the air flow rate, which can be implemented as the following formula:

[0091]

[0092] wherein, the dynamic pressure of the air, the gas density of the air, the air flow rate; according to the above formula, the dynamic pressure of the air at the pressure sensor position can be determined.

[0093] In a possible implementation, before determining the intake flow rate of the engine according to the current engine speed, the application will determine the dynamic pressure of the air at the pressure sensor position under the maximum intake flow rate, and the flow is as shown in Figure 3 which can be implemented as:

[0094] In step 301, the maximum intake flow rate is determined from the pre-established corresponding relationship between the engine speed interval and the intake flow rate.

[0095] In step 302, the air flow rate at the pressure sensor position under the maximum intake flow rate is determined based on the diameter of the air supply pipe at the pressure sensor position and the maximum intake flow rate.

[0096] In step 303, the dynamic pressure of the air at the position of the pressure sensor under the maximum intake flow is determined based on the air flow rate.

[0097] In a possible implementation, after the dynamic pressure of the air at the position of the pressure sensor under the maximum intake flow is determined, if the determined dynamic pressure under the maximum intake flow is greater than a preset dynamic pressure threshold, the step of determining the intake flow of the engine according to the current rotating speed of the engine is performed; if the determined dynamic pressure under the maximum intake flow is less than or equal to the preset dynamic pressure threshold, it is indicated that the dynamic pressure under the maximum intake flow has little effect on the intake negative pressure, that is, the effect of the dynamic pressure on the intake negative pressure can be ignored, it is determined that the intake negative pressure collected by the pressure sensor is not adjusted, and the step of determining the intake flow of the engine according to the current rotating speed of the engine is not performed.

[0098] In step 203, if the determined dynamic pressure is greater than the preset dynamic pressure threshold, the intake negative pressure collected by the pressure sensor is adjusted to increase based on the dynamic pressure, to obtain an adjusted intake negative pressure.

[0099] In a possible implementation, before the intake negative pressure collected by the pressure sensor is adjusted to increase based on the dynamic pressure, the embodiments of the present application consider that the intake negative pressure fluctuates, and further obtain a plurality of intake negative pressures of a plurality of working cycles of the engine, and take an average value of the plurality of intake negative pressures as the intake negative pressure collected by the pressure sensor.

[0100] It should be noted that the working cycle of the engine refers to a complete working process of the engine, including four processes of intake, compression, work and exhaust. For each working cycle, a corresponding intake negative pressure is collected by the pressure sensor.

[0101] In a possible implementation, the intake negative pressure collected by the pressure sensor is adjusted to increase based on the dynamic pressure, to obtain an adjusted intake negative pressure, and the process is as shown in Figure 4 , which can be implemented as

[0102] In step 401, the weight corresponding to the dynamic pressure is determined based on the air flow rate at the position of the pressure sensor.

[0103] In step 402, the dynamic pressure is multiplied by the weight to obtain an adjusted dynamic pressure.

[0104] In step 403, the dynamic pressure and the intake negative pressure collected by the pressure sensor are added to obtain an adjusted intake negative pressure.

[0105] For example, the preset dynamic pressure threshold is 0.5 kPa, the current dynamic pressure is 0.6 kPa, and the intake negative pressure collected by the pressure sensor is 5 kPa. It is determined that the intake negative pressure collected by the pressure sensor needs to be increased. In the preset corresponding relationship between the air flow rate and the weight, it is determined that the weight corresponding to the current dynamic pressure is 0.9, and the adjusted intake negative pressure is 5 kPa+0.6 kPa 0.9=5.54 kPa.

[0106] In another possible implementation, the embodiment of the application adds the dynamic pressure and the intake negative pressure collected by the pressure sensor to obtain the adjusted intake negative pressure.

[0107] In a possible implementation, due to the blockage of the air filter in response to the intake negative pressure, the embodiment of the application determines whether to clean the air filter according to the intake negative pressure. Specifically, it can be implemented as follows:

[0108] Determine the corresponding preset intake negative pressure threshold based on the air flow rate at the position of the pressure sensor.

[0109] If the adjusted intake negative pressure is greater than the preset intake negative pressure threshold, it is determined that the air filter needs to be cleaned and a signal indicating that the air filter needs to be cleaned is sent.

[0110] It should be noted that after the first time according to the determined comparison result indicating that the hydraulic system is in the overflow condition, the theoretical speed of the motor is adjusted until the actual speed of the motor on the overflow side is reduced to zero. During the adjustment of the theoretical speed, the identification step of whether the hydraulic system is in the overflow condition is no longer performed, and repeated identification is not required, thereby reducing the calculation amount.

[0111] In summary, the embodiment of the application can determine the dynamic pressure of air, increase the intake negative pressure collected by the sensor when the air dynamic pressure is greater than the preset threshold, make the obtained intake negative pressure more accurate, measure the blockage degree of the air filter more accurately based on the adjusted intake negative pressure value, and provide accurate data reference for the engine control unit, improve the accuracy and safety of engine control, and improve the vehicle driving experience.

[0112] Based on the same inventive concept, the application provides a device for determining engine intake negative pressure, as shown in Figure 5 The device 500 comprises:

[0113] An intake flow rate determination module 501 is configured to determine the intake flow rate of the engine according to the current speed of the engine.

[0114] The dynamic pressure determination module 502 is configured to determine an air flow rate at the position of the pressure sensor based on a diameter of an air supply pipe at the position of the pressure sensor and the intake air flow rate, and determine a dynamic pressure of air at the position of the pressure sensor based on the air flow rate; the pressure sensor is located inside an air supply pipe connecting an air cleaner and an engine, and the air cleaner is configured to filter air entering the engine.

[0115] The intake negative pressure determination module 503 is configured to, if the determined dynamic pressure is greater than a preset dynamic pressure threshold, increase the intake negative pressure collected by the pressure sensor based on the dynamic pressure to obtain an adjusted intake negative pressure.

[0116] In a possible implementation, the determining the intake air flow rate according to the current engine speed includes that:

[0117] determining an engine speed interval corresponding to the current engine speed from a pre-established corresponding relationship between engine speed intervals and intake air flow rates;

[0118] determining the corresponding intake air flow rate based on the engine speed interval; and the pre-established corresponding relationship between engine speed intervals and intake air flow rates is determined by acquiring the intake air flow rate under each engine speed interval through a performance load test.

[0119] In a possible implementation, before the determining the intake air flow rate of the engine according to the current engine speed, the dynamic pressure of air at the position of the pressure sensor under the maximum intake air flow rate is determined, and the dynamic pressure determination module 502 is specifically configured to:

[0120] determining the maximum intake air flow rate from the pre-established corresponding relationship between engine speed intervals and intake air flow rates;

[0121] determining an air flow rate at the position of the pressure sensor under the maximum intake air flow rate based on a diameter of an air supply pipe at the position of the pressure sensor and the maximum intake air flow rate;

[0122] determining the dynamic pressure of air at the position of the pressure sensor under the maximum intake air flow rate based on the air flow rate.

[0123] In a possible implementation, after the determining the dynamic pressure of air at the position of the pressure sensor under the maximum intake air flow rate, the device further includes a step execution judgment module configured to:

[0124] if the determined dynamic pressure under the maximum intake air flow rate is greater than the preset dynamic pressure threshold, executing the step of determining the intake air flow rate of the engine according to the current engine speed;

[0125] If the determined maximum intake flow rate corresponds to a dynamic pressure less than or equal to the preset dynamic pressure threshold, it is determined that the intake negative pressure collected by the pressure sensor is not adjusted, and it is determined that the step of determining the intake flow rate of the engine according to the current speed of the engine is not performed.

[0126] In a possible implementation, before the intake negative pressure collected by the pressure sensor is adjusted based on the dynamic pressure, the intake negative pressure determination module is further configured to:

[0127] acquire a plurality of intake negative pressures of a plurality of working cycles of the engine, and take an average value of the plurality of intake negative pressures as the intake negative pressure collected by the pressure sensor; the working cycle of the engine includes a process from intake to exhaust of the engine, and each working cycle corresponds to an intake negative pressure.

[0128] In a possible implementation, the intake negative pressure collected by the pressure sensor is adjusted based on the dynamic pressure to obtain an adjusted intake negative pressure, and the intake negative pressure determination module is specifically configured to:

[0129] determine a weight corresponding to the dynamic pressure based on the air flow rate at the position of the pressure sensor;

[0130] multiply the dynamic pressure by the weight to obtain an adjusted dynamic pressure;

[0131] add the dynamic pressure and the intake negative pressure collected by the pressure sensor to obtain the adjusted intake negative pressure.

[0132] In a possible implementation, the device further includes a cleaning determination module configured to:

[0133] determine a preset intake negative pressure threshold corresponding to the air flow rate at the position of the pressure sensor;

[0134] if the adjusted intake negative pressure is greater than the preset intake negative pressure threshold, it is determined that the air filter is cleaned and an air filter cleaning signal is sent.

[0135] The electronic device 130 according to this embodiment of the application will be described below with reference to Figure 6 . Figure 6 The electronic device 130 shown is merely an example, and should not impose any limitation on the functions and use range of the embodiments of the application.

[0136] As Figure 6 shown, the electronic device 130 is in the form of a general electronic device. The components of the electronic device 130 can include, but are not limited to, the at least one processor 131 described above, the at least one memory 132 described above, and a bus 133 connecting different system components, including the memory 132 and the processor 131.

[0137] Bus 133 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a processor or local bus using any of a variety of bus architectures, and the like.

[0138] Memory 132 can include a readable medium, such as volatile memory (RAM) 1321 and / or cache memory 1322 in the form of a volatile memory, and can further include read only memory (ROM) 1323.

[0139] Memory 132 can also include a program / utility 1325 having a set of program modules 1324, including an operating system, one or more application programs, other program modules, and program data, each of which can give the electronic device 130 its functionality, at least in part. Each of the operating system, one or more application programs, other program modules, and program data can include an implementation of a networking environment, either alone or in some combination.

[0140] Electronic device 130 can also communicate with one or more external devices 134 such as a keyboard or a pointing device, and / or one or more devices that enable a user to interact with electronic device 130 and / or one or more devices that enable electronic device 130 to communicate with one or more other electronic devices. Such communication can occur via input / output (I / O) interface 135. Still yet, electronic device 130 can communicate with one or more networks, such as one or more local area networks (LANs), wide area networks (WANs), and / or the Internet, through network adapter 136. As depicted, network adapter 136 communicates with the other components of electronic device 130 via bus 133. It should be appreciated that although not shown, other hardware and / or software components could be used in conjunction with electronic device 130. These include, but are not limited to, microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data archival storage systems, etc.

[0141] In an example embodiment, the present application also provides a computer readable storage medium including instructions, such as memory 132 including instructions, which can be executed by processor 131 of electronic device 130 to complete the above-mentioned method for determining engine intake negative pressure. Optionally, the computer readable storage medium can be a non-transitory computer readable storage medium, such as ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0142] In an exemplary embodiment, a computer program product is also provided, comprising a computer program which, when executed by the processor 131, implements the method for determining the negative pressure of the engine intake air as provided by the present application.

[0143] Those skilled in the art will appreciate that embodiments of the present application can be supplied as a method, a system, or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code thereon.

[0144] The present application is described in reference to the flowchart illustrations and / or block diagrams according to the methods, apparatus (systems) and computer program products of the present 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, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams block or blocks. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams block or blocks. Figure 1 means for performing the function specified by the flowchart illustrations and / or block diagrams block or blocks.

[0145] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart illustrations and / or block diagrams block or blocks. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams block or blocks. Figure 1 means for performing the function specified by the flowchart illustrations and / or block diagrams block or blocks.

[0146] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart illustrations and / or block diagrams block or blocks. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams block or blocks. Figure 1 means for performing the function specified by the flowchart illustrations and / or block diagrams block or blocks.

[0147] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method of determining negative pressure of engine intake air, characterized by, The method comprises: determining the intake flow of the engine according to the current rotating speed of the engine; determining the air flow rate at the position of the pressure sensor based on the diameter of the air feeding pipe at the position of the pressure sensor and the intake flow, and determining the dynamic pressure of the air at the position of the pressure sensor based on the air flow rate; wherein the pressure sensor is located inside the air feeding pipe connecting the air filter and the engine, and the air filter is used to filter the air entering the engine; if the determined dynamic pressure is greater than a preset dynamic pressure threshold, increasing the intake negative pressure collected by the pressure sensor based on the dynamic pressure to obtain the adjusted intake negative pressure.

2. The method of claim 1, wherein, The determination of the intake flow of the engine according to the current rotating speed of the engine comprises: determining the engine rotating speed interval corresponding to the current rotating speed from the pre-established corresponding relationship between the engine rotating speed interval and the intake flow; determining the corresponding intake flow based on the engine rotating speed interval; the pre-established corresponding relationship between the engine rotating speed interval and the intake flow is determined by acquiring the intake flow under each engine rotating speed interval through performance load test.

3. The method of claim 2, wherein, Before the determination of the intake flow of the engine according to the current rotating speed of the engine, the dynamic pressure of the air at the position of the pressure sensor under the maximum intake flow is determined, comprising: determining the maximum intake flow from the pre-established corresponding relationship between the engine rotating speed interval and the intake flow; determining the air flow rate at the position of the pressure sensor under the maximum intake flow based on the diameter of the air feeding pipe at the position of the pressure sensor and the maximum intake flow; determining the dynamic pressure of the air at the position of the pressure sensor under the maximum intake flow based on the air flow rate at the position of the pressure sensor under the maximum intake flow.

4. The method of claim 3, wherein, After the determination of the dynamic pressure of the air at the position of the pressure sensor under the maximum intake flow, the method further comprises: if the determined dynamic pressure under the maximum intake flow is greater than the preset dynamic pressure threshold, performing the step of determining the intake flow of the engine according to the current rotating speed of the engine; if the determined dynamic pressure under the maximum intake flow is less than or equal to the preset dynamic pressure threshold, determining not to adjust the intake negative pressure collected by the pressure sensor, and determining not to perform the step of determining the intake flow of the engine according to the current rotating speed of the engine.

5. The method of claim 1, wherein, Before the increasing adjustment of the intake negative pressure collected by the pressure sensor based on the dynamic pressure, the method further comprises: acquiring multiple intake negative pressures of multiple working cycles of the engine, and taking the average value of the multiple intake negative pressures as the intake negative pressure collected by the pressure sensor; the working cycle of the engine comprises the process from the intake to the exhaust of the engine, and each working cycle corresponds to an intake negative pressure.

6. The method of claim 1, wherein, The increasing adjustment of the intake negative pressure collected by the pressure sensor based on the dynamic pressure to obtain the adjusted intake negative pressure comprises: determining the weight corresponding to the dynamic pressure based on the air flow rate at the position of the pressure sensor; multiplying the dynamic pressure and the weight to obtain the adjusted dynamic pressure; adding the adjusted dynamic pressure and the intake negative pressure collected by the pressure sensor to obtain the adjusted intake negative pressure.

7. The method of claim 1, wherein, The method further comprises: determine a preset intake negative pressure threshold corresponding to the air flow rate at the pressure sensor position; if the adjusted intake negative pressure is greater than the preset intake negative pressure threshold, determine that the air cleaner needs to be cleaned and send an air cleaner cleaning signal.

8. An engine intake negative pressure determination device characterized by comprising: The device comprises: an intake flow rate determination module configured to determine an intake flow rate of the engine according to a current rotating speed of the engine; a dynamic pressure determination module configured to determine an air flow rate at the pressure sensor position based on a diameter of an air supply pipe at the pressure sensor position and the intake flow rate, and determine a dynamic pressure of air at the pressure sensor position based on the air flow rate, wherein the pressure sensor is located inside the air supply pipe connecting the air cleaner and the engine, and the air cleaner is configured to filter air entering the engine; an intake negative pressure determination module configured to, if the determined dynamic pressure is greater than a preset dynamic pressure threshold, increase the intake negative pressure collected by the pressure sensor based on the dynamic pressure to obtain an adjusted intake negative pressure.

9. An electronic device, comprising: comprise: a processor and a memory; the memory is configured to store instructions executable by the processor; the processor is configured to execute the instructions to implement the method for determining an intake negative pressure of an engine according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, When the instructions in the computer readable storage medium are executed by the processor of the electronic device, the electronic device is enabled to perform the method for determining an intake negative pressure of an engine according to any one of claims 1-7.

11. A computer program product, characterised in that, The computer program product comprises: computer program code, when the computer program code runs on a computer, the computer is enabled to perform the method for determining an intake negative pressure of an engine according to any one of claims 1-7.

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