Fuel injection calibration method, device and related equipment for engine bench test

Abstract

The present invention discloses a fuel injection calibration method, device, and related equipment for an engine bench test. The fuel injection calibration method for an engine bench test includes obtaining, at a first speed and a first load, pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles according to angle steps and different injection angles; determining an optimal initial injection angle according to the pressure cycle variation coefficients and exhaust temperature boundary values; obtaining, at a first speed and a first load, multiple engine super knock parameters according to angle steps and different injection angles; determining an optimal end injection angle and injection ratio according to the super knock parameters; and repeating the above steps while changing the first speed and / or first load. The method achieves accurate calibration of the optimal initial injection angle, the optimal end injection angle, and the injection ratio, and by calibrating the performance of the economic fuel consumption zone, the workload of engine bench calibration can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a fuel injection calibration method, device, computer equipment and computer storage medium for an engine bench test. Background Art

[0002] The range extender of a range-extended hybrid vehicle consists of an engine and a generator. To ensure that the engine can operate in an economical range while maintaining emissions performance, the vehicle's performance must be calibrated. Engine bench calibration testing is essential before vehicle performance can be performed.

[0003] In the related art, during the engine bench calibration process of traditional gasoline engines, full-load point sweeping is required to obtain the performance of the entire engine operating range. Since full-load point sweeping will result in a huge workload, how to better implement engine bench calibration has become an urgent problem to be solved. Summary of the Invention

[0004] The object of the present invention is to solve one of the above-mentioned technical problems at least to a certain extent.

[0005] To this end, the first purpose of the present invention is to propose a fuel injection calibration method for engine bench testing, which can accurately calibrate the optimal initial injection angle, the optimal end injection angle and the injection ratio, and by calibrating the performance of the economic fuel consumption zone, it can greatly reduce the workload of engine bench calibration.

[0006] A second object of the present invention is to provide a fuel injection calibration device for engine bench testing.

[0007] A third object of the present invention is to provide a computer device.

[0008] A fourth object of the present invention is to provide a computer-readable storage medium.

[0009] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes an injection calibration method for an engine bench test, comprising: obtaining, at a first speed and a first load, pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles according to the angle step and different injection angles; determining an optimal initial injection angle according to the pressure cycle variation coefficient and exhaust temperature boundary value; obtaining, at the first speed and the first load, multiple engine super knock parameters according to the angle step and the different injection angles; determining an optimal ending injection angle and injection ratio according to the super knock parameters; and repeating the above steps while changing the first speed and / or the first load.

[0010] According to an embodiment of the present invention, an injection calibration method for an engine bench test comprises obtaining pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles at a first speed and a first load based on an angle step size and different injection angles; determining an optimal initial injection angle based on the pressure cycle variation coefficients and exhaust temperature boundary values; obtaining multiple engine super knock parameters at the first speed and a first load based on the angle step size and different injection angles; determining an optimal ending injection angle and injection ratio based on the super knock parameters; and repeating the above steps while varying the first speed and / or first load. This method enables accurate calibration of the optimal initial injection angle, optimal ending injection angle, and injection ratio, and by calibrating performance in the fuel economy zone, significantly reduces the workload of engine bench calibration.

[0011] According to one embodiment of the present invention, determining the optimal initial injection angle based on the pressure cycle variation coefficient and the exhaust temperature boundary value includes: when the pressure cycle variation coefficient is between a first pressure cycle variation coefficient threshold value and a second pressure cycle variation coefficient threshold value, and the exhaust temperature boundary value is less than the exhaust temperature boundary threshold value, using the injection angle corresponding to the pressure cycle variation coefficient and the exhaust temperature boundary value as the initial injection angle of the engine.

[0012] According to one embodiment of the present invention, the initial value of the injection angle is 10 degrees.

[0013] According to one embodiment of the present invention, the end value of the injection angle is 80 degrees.

[0014] According to one embodiment of the present invention, the angle step is 5 degrees.

[0015] According to one embodiment of the present invention, the first rotation speed is not less than 800 RPM per minute and not more than 4000 RPM per minute.

[0016] According to one embodiment of the present invention, the first load is no less than 200 KPA.

[0017] According to one embodiment of the present invention, it also includes: determining the optimal initial injection angle moment and the optimal end injection angle moment based on the optimal initial injection angle and the optimal end injection angle; determining the optimal injection time difference based on the optimal initial injection angle moment and the optimal end injection angle moment; determining the optimal injection duration based on the optimal injection time difference and the injection ratio.

[0018] To achieve the above-mentioned purpose, the injection calibration device for engine bench test proposed in the second embodiment of the present invention includes: a first acquisition module, used to obtain pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles according to the angle step and different injection angles at a first speed and a first load; a first determination module, used to determine the optimal initial injection angle according to the pressure cycle variation coefficient and the exhaust temperature boundary value; a second acquisition module, used to obtain multiple engine super knock parameters according to the angle step and the different injection angles at the first speed and the first load; a second determination module, used to determine the optimal ending injection angle and injection ratio according to the super knock parameters; a repetition module, used to repeat the above steps while changing the first speed and / or the first load.

[0019] According to an embodiment of the present invention, an injection calibration device for an engine bench test obtains pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple sets of injection angles at a first speed and a first load based on an angle step size and different injection angles; determines an optimal initial injection angle based on the pressure cycle variation coefficients and exhaust temperature boundary values; obtains multiple engine super knock parameters at the first speed and a first load based on the angle step size and different injection angles; determines an optimal ending injection angle and injection ratio based on the super knock parameters; and repeats these steps while varying the first speed and / or first load. This allows for accurate calibration of the optimal initial injection angle, optimal ending injection angle, and injection ratio, and significantly reduces the workload of engine bench calibration by calibrating performance in the fuel economy zone.

[0020] To achieve the above-mentioned purpose, the computer device proposed in the third embodiment of the present invention includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the fuel injection calibration of the engine bench test described in the first embodiment of the present invention is implemented.

[0021] To achieve the above-mentioned purpose, a computer-readable storage medium is proposed in a fourth embodiment of the present invention, and when the computer program is executed by a processor, the fuel injection calibration method for the engine bench test described in the first embodiment of the present invention is implemented.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0024] Figure 1is a flow chart of a fuel injection calibration method for an engine bench test according to one embodiment of the present invention;

[0025] Figure 2 is a flow chart of a fuel injection calibration method for an engine bench test according to a specific embodiment of the present invention;

[0026] Figure 3 2 is a schematic structural diagram of a fuel injection calibration device for an engine bench test according to an embodiment of the present invention;

[0027] Figure 4 2 is a schematic structural diagram of a fuel injection calibration device for an engine bench test according to an embodiment of the present invention;

[0028] Figure 5 FIG. 1 is a schematic structural diagram of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0030] The range extender of a range-extended hybrid vehicle consists of an engine and a generator. When the battery charge is insufficient to provide power, the engine starts and generates electricity through the generator, which drives the electric motor to drive the vehicle. The engine used in the range extender does not directly power the vehicle, but is only used for power generation. Therefore, it is hoped that the engine used in the range extender can operate in a relatively economical range while also taking into account emission performance. Before calibrating the performance of the entire vehicle, an engine bench calibration test must be conducted. The main task of the engine bench test is to determine the intake, injection, and ignition performance of the engine at various operating points under standard operating conditions (intake air temperature of 25°C, engine water temperature of 90°C, and standard atmospheric pressure).

[0031] During the engine bench calibration process of traditional gasoline engines, full-load point sweeping is required to obtain the performance of the entire engine operating range. Since full-load point sweeping will result in a huge workload, how to better implement engine bench calibration has become an urgent problem to be solved.

[0032] To this end, the present invention proposes a fuel injection calibration method, device, computer equipment and computer storage medium for engine bench testing.

[0033] Specifically, the fuel injection calibration, apparatus, computer equipment, and computer storage medium for an engine bench test according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0034] Figure 1The flowchart of the fuel injection calibration method for an engine bench test according to an embodiment of the present invention is as follows. It should be noted that the fuel injection calibration method for an engine bench test according to an embodiment of the present invention can be applied to the fuel injection calibration device for an engine bench test according to an embodiment of the present invention, which can be configured on a computer device or on a server. The computer device can be a PC or a mobile terminal (such as a smart phone, tablet computer, etc.). This embodiment of the present invention is not limited to this.

[0035] like Figure 1 As shown in Figure 2, the fuel injection calibration method for the engine bench test includes:

[0036] S110 , at a first speed and a first load, obtaining pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles according to the angle step size and different injection angles.

[0037] Here, the first speed and the first load can be understood as being at a fixed speed and a fixed load. The first speed and the first load can be predetermined based on empirical values ​​of similar models.

[0038] In an embodiment of the present invention, at a first speed and a first load, the injection angle can be adjusted to obtain pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles according to the injection angle and the angle step.

[0039] The methods for adjusting the injection angle include but are not limited to manual adjustment, adjustment by a regulator, etc.

[0040] Among them, the initial value of the injection angle is 10 degrees, the end value of the injection angle is 80 degrees, the angle step is 5 degrees, the first speed is not less than 800RPM per minute and not more than 4000RPM per minute, and the first load is not less than 200KPA.

[0041] It should be noted that during normal engine operation, the intake stroke begins. After the intake stroke, the crankshaft continues to drive the piston from bottom dead center to top dead center during the compression stroke. At this point, both the intake and exhaust valves are closed. As the piston moves and the cylinder volume continues to decrease, the combustible mixture in the cylinder is compressed, causing its pressure and temperature to rise. Therefore, when the engine is operating in the compression stroke, the pressure in the cylinder is relatively high. For a direct injection engine, a conventional fuel pump cannot meet this pressure. Therefore, another important feature of a direct injection engine is that its fuel pump provides a very high fuel supply pressure, which ensures that gasoline is effectively injected into the high-pressure combustion chamber. Therefore, in an embodiment of the present invention, the direct injection gasoline engine has two fuel pumps: a conventional low-pressure pump (3.5 bar to 5 bar) and a high-pressure pump (100 bar to 350 bar) driven by the intake camshaft.

[0042] S120 , determining an optimal initial injection angle based on the pressure cycle variation coefficient and the exhaust temperature boundary value.

[0043] In other words, the pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles are obtained, and the optimal initial injection angle can be determined based on the pressure cycle variation coefficients and exhaust temperature boundary values.

[0044] In an embodiment of the present invention, when the pressure cycle variation coefficient is between the first pressure cycle variation coefficient threshold value and the second pressure cycle variation coefficient threshold value, and the exhaust temperature boundary value is less than the exhaust temperature boundary threshold value, the injection angle corresponding to the pressure cycle variation coefficient and the exhaust temperature boundary value is used as the initial injection angle of the engine.

[0045] It should be noted that a larger positive increment value of the optimal initial injection angle indicates a later start after non-firing top dead center. For example, if the optimal initial injection angle is 40 degrees, injection begins at 40 degrees after non-firing top dead center. For example, the positive increment value can be understood as a positive increase in the optimal initial injection angle. For example, from 40 degrees to 45 degrees, the positive increment value is 5.

[0046] S130 , obtaining a plurality of engine super knock parameters according to the angle step and different injection angles at a first speed and a first load.

[0047] It should be noted that, since the optimal start injection angle and the optimal end injection angle determined are different at different speeds and different loads, the present invention determines the optimal start injection angle and the optimal end injection angle at a fixed speed and a fixed load.

[0048] In an embodiment of the present invention, at a first speed and a first load, multiple engine super knock parameters can be obtained by adjusting the injection angle and the injection angle step size. Specific implementation methods can be found in subsequent embodiments.

[0049] The methods for adjusting the injection angle include but are not limited to manual adjustment, adjustment by a regulator, etc.

[0050] Among them, the initial value of the injection angle is 10 degrees, the end value of the injection angle is 80 degrees, the angle step is 5 degrees, the first speed is not less than 800RPM per minute and not more than 4000RPM per minute, and the first load is not less than 200KPA.

[0051] Among them, the first rotational speed is not less than 800RPM per minute and not greater than 4000RPM per minute, which can be understood as the first rotational speed is greater than or equal to 800RPM per minute and less than or equal to 4000RPM per minute.

[0052] Among them, the first load is not less than 200KPA, wherein the first load is not less than 200KPA, which can be understood as the first load starts from a minimum of 200KPA and increases by one point every 200KPA until the maximum load point, that is, the throttle fully open point (WOT point).

[0053] S140: Determine the optimal end injection angle and injection ratio based on the super knock parameters.

[0054] That is, after obtaining multiple engine super knock parameters, the optimal end injection angle and injection ratio can be determined according to the super knock parameters. The specific implementation process can be referred to in the subsequent embodiments.

[0055] It should be noted that a larger positive decrease value of the optimal end injection angle indicates an earlier point before ignition top dead center. For example, if the optimal end injection angle is 70 degrees, injection ends at 70 degrees before ignition top dead center. For example, a positive decrease value can be understood as a positive decrease in the optimal end injection angle, for example, from 70 degrees to 65 degrees. In this case, the positive decrease value is 5.

[0056] S150, repeating the above steps while changing the first speed and / or the first load.

[0057] It should be noted that, because the optimal start and end injection angles are determined differently at different speeds and loads, this step can determine the optimal start and end injection angles at different speeds and / or loads by varying the speed and / or load. The method for determining the optimal start and end injection angles can be found in the above embodiments and will not be further described in detail in the present invention.

[0058] According to an embodiment of the present invention, an injection calibration method for an engine bench test obtains pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple sets of injection angles at a first speed and a first load based on an angle step size and different injection angles. An optimal initial injection angle is then determined based on the pressure cycle variation coefficients and exhaust temperature boundary values. Furthermore, multiple engine super knock parameters are obtained based on the angle step size and different injection angles at the first speed and a first load. An optimal ending injection angle and injection ratio are then determined based on the super knock parameters. This method accurately determines the optimal initial injection angle based on the pressure cycle variation coefficients and exhaust temperature boundary values, and accurately determines the optimal ending injection angle and injection ratio based on the super knock parameters. This method allows for accurate calibration of the optimal initial injection angle, optimal ending injection angle, and injection ratio. Furthermore, by calibrating performance in the fuel economy zone, the workload of engine bench calibration can be significantly reduced.

[0059] In the embodiment of the present invention, after calibrating the optimal initial injection angle, the optimal end injection angle and the injection ratio, the appropriate optimal injection duration can be determined for each load point. To this end, in order to select the appropriate optimal injection duration, as shown in FIG. Figure 2 As shown, Figure 2 The flowchart of the fuel injection calibration method for an engine bench test according to a specific embodiment of the present invention is as follows. The fuel injection calibration method for an engine bench test comprises:

[0060] S210 , at a first speed and a first load, obtaining pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles according to the angle step and different injection angles.

[0061] In an embodiment of the present invention, at a first speed and a first load, the injection angle can be adjusted to obtain pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles according to the injection angle and the angle step.

[0062] Among them, the initial value of the injection angle is 10 degrees, the end value of the injection angle is 80 degrees, the angle step is 5 degrees, the first speed is not less than 800RPM per minute and not more than 4000RPM per minute, and the first load is not less than 200KPA.

[0063] Among them, the first rotational speed is not less than 800RPM per minute and not greater than 4000RPM per minute, which can be understood as the first rotational speed is greater than or equal to 800RPM per minute and less than or equal to 4000RPM per minute.

[0064] Among them, the first load is not less than 200KPA, wherein the first load is not less than 200KPA, which can be understood as the first load starts from a minimum of 200KPA and increases by one point every 200KPA until the maximum load point, that is, the throttle fully open point (WOT point).

[0065] For example, at a fixed speed of 800 RPM and a fixed load of 200, the injection angle is manually adjusted, where the injection angle range is 10 degrees to 80 degrees. In the process of adjusting from 10 degrees to 80 degrees, multiple groups of injection angles can be obtained with a step length of 5 degrees, where each group of injection angles corresponds to a pressure cycle variation coefficient and an exhaust temperature boundary value, and thus the pressure cycle variation coefficient and exhaust temperature boundary value corresponding to the multiple groups of injection angles can be obtained.

[0066] S220: Determine the optimal initial injection angle based on the pressure cycle variation coefficient and the exhaust temperature boundary value.

[0067] In an embodiment of the present invention, when the pressure cycle variation coefficient is between the first pressure cycle variation coefficient threshold value and the second pressure cycle variation coefficient threshold value, and the exhaust temperature boundary value is less than the exhaust temperature boundary threshold value, the injection angle corresponding to the pressure cycle variation coefficient and the exhaust temperature boundary value is used as the initial injection angle of the engine.

[0068] For example, when the pressure cycle variation coefficient is between the first pressure cycle variation coefficient threshold 3 and the second pressure cycle variation coefficient threshold 4, and the exhaust temperature boundary value is less than 850 degrees, the corresponding injection angle is used as the initial injection angle of the engine.

[0069] S230 , obtaining a plurality of engine super knock parameters according to the angle step and different injection angles at a first speed and a first load.

[0070] In an embodiment of the present invention, at a first speed and a first load, a plurality of engine super knock parameters can be obtained by adjusting the injection angle and the angle step size.

[0071] For example, at a fixed speed of 800 RPM and a fixed load of 200, the injection angle is manually adjusted, where the injection angle range is 10 degrees to 80 degrees. In the process of adjusting from 10 degrees to 80 degrees, with a step length of 5 degrees, multiple sets of injection angles corresponding to the engine super knock parameters can be determined, that is, multiple engine super knock parameters are obtained.

[0072] S240: Determine the optimal end injection angle and injection ratio based on the super knock parameters.

[0073] In other words, multiple engine super knock parameters are obtained, and the optimal end injection angle and injection ratio can be determined based on the super knock parameters.

[0074] For example, after obtaining multiple engine super knock parameters, it can be determined whether the super knock parameters are within the preset super knock parameter range. If so, it means that super knock has not occurred, and the injection angle corresponding to the super knock parameters within the preset super knock parameter range is used as the optimal end injection angle.

[0075] Among them, the implementation methods of determining whether the super knock parameters are within the preset super knock parameter range include but are not limited to speaker equipment, high-pressure sensors, manual labor, etc.

[0076] S250: Repeat the above steps while changing the first speed and / or the first load.

[0077] It should be noted that, because the optimal start and end injection angles are determined differently at different speeds and loads, this step can determine the optimal start and end injection angles at different speeds and / or loads by varying the speed and / or load. The method for determining the optimal start and end injection angles can be found in the above embodiments and will not be further described in detail in the present invention.

[0078] S260: Determine an optimal initial injection angle timing and an optimal ending injection angle timing based on the optimal initial injection angle and the optimal ending injection angle.

[0079] In an embodiment of the present invention, after determining the optimal initial injection angle and the optimal end injection angle, the optimal initial injection angle moment corresponding to the optimal initial injection angle and the optimal end injection angle moment corresponding to the optimal end injection angle can be determined.

[0080] S270: Determine an optimal injection time difference based on the optimal initial injection angle timing and the optimal end injection angle timing.

[0081] That is, the optimal initial injection angle timing and the optimal end injection angle timing are obtained, and the optimal injection time difference can be determined according to the optimal initial injection angle timing and the optimal end injection angle timing.

[0082] S280: Determine an optimal injection duration based on the optimal injection time difference and the injection ratio.

[0083] That is to say, after determining the optimal injection time difference, the optimal injection duration can be determined based on the optimal injection time difference and the injection ratio.

[0084] In an embodiment of the present invention, the optimal injection duration may be determined based on the product of the optimal injection time difference and the injection ratio.

[0085] According to an embodiment of the present invention, the fuel injection calibration method for an engine bench test determines the optimal initial injection angle, the optimal end injection angle, and the injection ratio. Based on the optimal initial and end injection angles, the optimal initial and end injection angle times are determined. The optimal injection time difference is then determined based on the optimal initial and end injection angle times. Finally, the optimal injection duration is determined based on the optimal injection time difference and the injection ratio. This method allows for the determination of the appropriate optimal injection duration for each load point, thereby enabling precise control of the injection amount and achieving excellent fuel atomization.

[0086] Corresponding to the fuel injection calibration methods for engine bench tests provided in the above-mentioned embodiments, an embodiment of the present invention further provides a fuel injection calibration device for engine bench tests. Since the fuel injection calibration device for engine bench tests provided in this embodiment of the present invention corresponds to the fuel injection calibration methods for engine bench tests provided in the above-mentioned embodiments, the implementation methods of the fuel injection calibration methods for engine bench tests are also applicable to the fuel injection calibration device for engine bench tests provided in this embodiment, and will not be described in detail in this embodiment. Figure 3 The figure is a schematic structural diagram of a fuel injection calibration device for an engine bench test according to an embodiment of the present invention.

[0087] like Figure 3 As shown, the fuel injection calibration device 300 for the engine bench test includes: a first acquisition module 310, a first determination module 320, a second acquisition module 330, a second determination module 340 and a repetition module 350, wherein:

[0088] A first acquisition module 310 is configured to acquire, at a first speed and a first load, pressure cyclic variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles based on angle steps and different injection angles;

[0089] A first determination module 320 is configured to determine an optimal initial injection angle according to the pressure cyclic variation coefficient and the exhaust temperature boundary value;

[0090] a second acquisition module 330 for acquiring, at the first speed and the first load, a plurality of engine super knock parameters according to the angle step and the different injection angles;

[0091] A second determination module 340 is configured to determine an optimal end injection angle and injection ratio according to the super knock parameters;

[0092] The repeating module 350 is configured to repeat the above steps while changing the first speed and / or the first load.

[0093] According to an embodiment of the present invention, an injection calibration device for an engine bench test obtains pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple sets of injection angles at a first speed and a first load based on an angle step size and different injection angles; determines an optimal initial injection angle based on the pressure cycle variation coefficients and exhaust temperature boundary values; obtains multiple engine super knock parameters at the first speed and a first load based on the angle step size and different injection angles; determines an optimal ending injection angle and injection ratio based on the super knock parameters; and repeats these steps while varying the first speed and / or first load. This allows for accurate calibration of the optimal initial injection angle, optimal ending injection angle, and injection ratio, and significantly reduces the workload of engine bench calibration by calibrating performance in the fuel economy zone.

[0094] In one embodiment of the present invention, the first determination module 320 is specifically used to use the injection angle corresponding to the pressure cycle variation coefficient and the exhaust temperature boundary value as the initial injection angle of the engine when the pressure cycle variation coefficient is between a first pressure cycle variation coefficient threshold value and a second pressure cycle variation coefficient threshold value and the exhaust temperature boundary value is less than the exhaust temperature boundary threshold value.

[0095] In one embodiment of the present invention, the initial value of the injection angle is 10 degrees.

[0096] In one embodiment of the present invention, the end value of the injection angle is 80 degrees.

[0097] In one embodiment of the present invention, the angle step is 5 degrees.

[0098] In one embodiment of the present invention, the first rotation speed is not less than 800 RPM per minute and not more than 4000 RPM per minute.

[0099] In one embodiment of the present invention, the first load is not less than 200 KPA.

[0100] In one embodiment of the present invention, Figure 4 As shown, the device also includes: a third determination module 360, used to determine the optimal initial injection angle moment and the optimal end injection angle moment according to the optimal initial injection angle and the optimal end injection angle; a fourth determination module 370, used to determine the optimal injection time difference according to the optimal initial injection angle moment and the optimal end injection angle moment; a fifth determination module 380, used to determine the optimal injection duration according to the optimal injection time difference and the injection ratio.

[0101] According to the device of the embodiment of the present invention, the following reference Figure 5 , which shows a computer device (eg Figure 1 The terminal device in the embodiment of the present invention may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (such as in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The computer device shown is only an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0102] like Figure 5As shown, the computer 500 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 501, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage device 508 into a random access memory (RAM) 503. Various programs and data required for the operation of the computer device 500 are also stored in the RAM 503. The processing device 501, the ROM 502, and the RAM 503 are connected to each other via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0103] Typically, the following devices may be connected to the I / O interface 505: an input device 506 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 507 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 508 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 509. The communication device 509 may allow the computer device 500 to communicate with other devices wirelessly or by wire to exchange data. Although Figure 5 The computer device 500 is shown with various devices, but it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed instead.

[0104] In particular, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication device 509, or installed from the storage device 508, or installed from the ROM 502. When the computer program is executed by the processing device 501, the above-mentioned functions defined in the method of the embodiment of the present invention are performed.

[0105] It should be noted that the computer-readable medium described above in the present invention may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection having one or more conductors, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device, or component. In the present invention, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to wires, optical cables, RF (radio frequency), etc., or any suitable combination thereof.

[0106] In some embodiments, the client and server can communicate using any currently known or future developed network protocol, such as HTTP (HyperText Transfer Protocol), and can be interconnected with 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"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an adhoc peer-to-peer network), as well as any currently known or future developed network.

[0107] The computer-readable medium may be included in the computer device, or may exist independently without being incorporated into the computer device.

[0108] The computer-readable medium carries one or more programs. When the one or more programs are executed by the computer device, the computer device: obtains at least two Internet Protocol addresses; sends a node evaluation request including the at least two Internet Protocol addresses to a node evaluation device, wherein the node evaluation device selects an Internet Protocol address from the at least two Internet Protocol addresses and returns it; receives the Internet Protocol address returned by the node evaluation device; wherein the obtained Internet Protocol address indicates an edge node in a content distribution network.

[0109] Alternatively, the computer-readable medium carries one or more programs, which, when executed by the computer device, cause the computer device to: receive a node evaluation request including at least two Internet Protocol addresses; select an Internet Protocol address from the at least two Internet Protocol addresses; and return the selected Internet Protocol address; wherein the received Internet Protocol address indicates an edge node in a content distribution network.

[0110] Computer program code for performing the operations of the present invention may be written in one or more programming languages, or a combination thereof, including, but not limited to, object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0111] The flow charts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the system, method and computer program product according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, program segment, or a part of code, and the module, program segment, or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0112] The units involved in the embodiments of the present invention may be implemented in software or hardware. In some cases, the name of a unit does not limit the unit itself. For example, the first acquisition unit may also be described as a "unit for acquiring at least two Internet Protocol addresses."

[0113] The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, and without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chip (SOCs), complex programmable logic devices (CPLDs), and the like.

[0114] In the context of the present invention, machine-readable medium can be a tangible medium that can contain or store a program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0115] The above description is merely a preferred embodiment of the present invention and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present invention is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the present invention.

[0116] In addition, although adopting specific order to describe each operation, this should not be interpreted as requiring these operations to be executed in the specific order shown or in sequential order.Under certain environment, multitasking and parallel processing may be advantageous.Similarly, although comprising some specific implementation details in the above discussion, these should not be interpreted as limiting the scope of the present invention.Some features described in the context of independent embodiment can also be implemented in single embodiment in combination.On the contrary, the various features described in the context of independent embodiment also can be implemented in multiple embodiments individually or in the mode of any suitable subcombination.

[0117] Although the subject matter has been described in language specific to structural features and / or methodological logical acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

Claims

1. A fuel injection calibration method for an engine bench test, characterized in that: include: Under a first speed and a first load, according to the angle step size and different injection angles, obtain pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to multiple groups of injection angles; determining an optimal initial injection angle according to the pressure cycle variation coefficient and the exhaust temperature boundary value; obtaining, at the first speed and the first load, a plurality of engine super knock parameters according to the angle step and the different injection angles; determining an optimal end injection angle and injection ratio according to the super knock parameters; Repeat the above steps while changing the first rotation speed and / or the first load.

2. The method according to claim 1, characterized in that The determining of the optimal initial injection angle according to the pressure cycle variation coefficient and the exhaust temperature boundary value includes: When the pressure cycle variation coefficient is between a first pressure cycle variation coefficient threshold and a second pressure cycle variation coefficient threshold, and the exhaust temperature boundary value is less than the exhaust temperature boundary threshold, the injection angle corresponding to the pressure cycle variation coefficient and the exhaust temperature boundary value is used as the initial injection angle of the engine.

3. The method according to claim 1, characterized in that The initial value of the injection angle is 10 degrees.

4. The method according to claim 1, wherein The end value of the injection angle is 80 degrees.

5. The method according to claim 1, wherein The angle step is 5 degrees.

6. The method according to claim 1, wherein The first rotation speed is not less than 800 RPM per minute and not more than 4000 RPM per minute.

7. The method according to claim 1, characterized in that The first load is not less than 200KPA.

8. The method according to claim 1, characterized in that Also includes: Determining the optimal initial injection angle timing and the optimal ending injection angle timing according to the optimal initial injection angle and the optimal ending injection angle; determining an optimal injection time difference according to the optimal initial injection angle timing and the optimal end injection angle timing; An optimal injection duration is determined according to the optimal injection time difference and the injection ratio.

9. An injection calibration device for engine bench test, characterized in that: include: A first acquisition module is configured to acquire, at a first speed and a first load, pressure cycle variation coefficients and exhaust temperature boundary values ​​corresponding to a plurality of groups of injection angles according to an angle step size and different injection angles; a first determination module, configured to determine an optimal initial injection angle according to the pressure cyclic variation coefficient and the exhaust temperature boundary value; a second acquisition module, configured to acquire, at the first speed and the first load, a plurality of engine super knock parameters according to the angle step and the different injection angles; a second determination module, configured to determine an optimal end injection angle and injection ratio according to the super knock parameters; The repeating module is used to repeat the above steps while changing the first speed and / or the first load.

10. A computer device, characterized in that: include: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the fuel injection calibration method for an engine bench test according to any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that The fuel injection calibration method is configured to enable the computer to execute the engine bench test according to any one of claims 1 to 8.

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