Injection rail pressure correction method, device, electronic device and storage medium

Abstract

The present invention provides a method, device, electronic device, and storage medium for correcting injection rail pressure, belonging to the technical field of diesel engine fuel system control technology, and is applied to a high-pressure common rail fuel system, wherein the high-pressure common rail fuel system includes a current working cylinder and multiple cylinders to be worked. The method comprises: determining a target cylinder corresponding to the current working cylinder among the multiple cylinders to be worked; determining a rail pressure correction value for the target cylinder during its last injection; obtaining a reference rail pressure for the current working cylinder based on a rail pressure sensor disposed at the fixed position; and using the sum of the reference rail pressure and the rail pressure correction value as the injection rail pressure for the next injection of the current working cylinder. The present invention eliminates the need for designing dynamic interrupts for collecting rail pressure, avoids conflicts and other issues associated with dynamic interrupts, improves safety during injection, and increases the accuracy of the ultimately determined injection rail pressure, thereby improving fuel injection precision.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engine fuel system control, and in particular to an injection rail pressure correction method, device, electronic equipment and storage medium. Background Art

[0002] Due to its advantages, such as high injection pressure, precise injection control, and multiple injection technology, the high-pressure common rail fuel system has become the mainstream technology in diesel engine fuel systems. The calculation of the injector's injection pulse width directly affects the injection accuracy of the fuel. During the calculation of the injector's injection pulse width, the injection rail pressure is a key factor affecting injection accuracy.

[0003] Existing methods for determining injection rail pressure, such as those described in CN10301618A, employ a dynamic injection switch that is closed before each injection to collect the current rail pressure. This solution collects and calculates the actual rail pressure before each injection in each cylinder, using this rail pressure as the injection rail pressure to calculate the pulse width for each injection. While this approach can achieve more accurate injection rail pressure, it requires the development of dynamic interrupts in the basic software (BSW), increasing development complexity. Furthermore, when dynamic interrupts are numerous, they may not complete their intended tasks within the interrupt time, leading to unpredictable consequences (such as unexpected injection pulse widths, resulting in engine runaway or stalling).

[0004] Therefore, there is an urgent need to provide an injection rail pressure correction method, device, electronic device and storage medium, which can be used to ensure the accuracy of the injection rail pressure while avoiding uncontrolled injection pulse width and improving injection safety and reliability. Summary of the Invention

[0005] In view of this, it is necessary to provide an injection rail pressure correction method, device, electronic device and storage medium to solve the technical problems in the prior art that dynamic interruption of basic software development is required and there are too many interruptions, resulting in the inability to ensure safety during the injection process.

[0006] On one hand, in order to solve the above technical problems, the present invention provides an injection rail pressure correction method, which is applied to a high-pressure common rail fuel system, wherein the high-pressure common rail fuel system includes a current working cylinder and multiple cylinders to be worked; the method comprises:

[0007] determining a target cylinder corresponding to the current working cylinder among the plurality of cylinders to be worked;

[0008] determining a rail pressure correction value of the target cylinder at the time of the last injection;

[0009] obtaining a reference rail pressure of the current working cylinder based on a rail pressure sensor provided at the fixed position;

[0010] The sum of the reference rail pressure and the rail pressure correction value is used as the injection rail pressure during the next injection of the current working cylinder.

[0011] In one possible implementation, the high-pressure common rail fuel system is a synchronous pump / injection system or an asynchronous pump / injection system; determining a target cylinder among the multiple cylinders to be activated that has the same operating characteristics as the current activated cylinder includes:

[0012] When the high-pressure common rail fuel system is a synchronous pump / injection system, the target cylinder is the first cylinder;

[0013] When the high-pressure common rail fuel system is an asynchronous pumping / injection system, injection characteristics of the high-pressure common rail fuel system are obtained, and the target cylinder is determined based on correlation of the injection characteristics.

[0014] In a possible implementation, the injection characteristics include an oil pumping cycle, an oil injection cycle, an interval angle between two cylinders, and an ignition sequence.

[0015] In a possible implementation, determining the rail pressure correction value of the target cylinder during the last injection includes:

[0016] Acquiring at least one sampled rail pressure collected by a rail pressure sensor during a last injection of the target cylinder;

[0017] determining a rail pressure average of the at least one sampled rail pressure;

[0018] A target reference rail pressure at the time of last injection of the target cylinder is acquired based on a rail pressure sensor provided at the fixed position, and a difference between the target reference rail pressure and the rail pressure average is used as the rail pressure correction value.

[0019] In a possible implementation, a sampling interval of the at least one sampled rail pressure is 0.1 millisecond.

[0020] In a possible implementation, obtaining the reference rail pressure of the current working cylinder based on the rail pressure sensor provided at the fixed position includes:

[0021] The peak rail pressure or the average rail pressure of the current working cylinder is obtained based on the rail pressure sensor provided at the fixed position, and the peak rail pressure or the average rail pressure is used as the reference rail pressure.

[0022] In a possible implementation, the method further includes:

[0023] An injection pulse width is determined based on the injection rail pressure, and a pulse width of the next injection of the current cylinder is controlled to be the injection pulse width.

[0024] On the other hand, the present invention further provides an injection rail pressure correction device, which is applied to a high-pressure common rail fuel system, wherein the high-pressure common rail fuel system includes a currently working cylinder and a plurality of cylinders to be worked; the device includes:

[0025] a target cylinder determining unit, configured to determine a target cylinder corresponding to the current working cylinder among the plurality of cylinders to be worked;

[0026] a rail pressure correction value determining unit, configured to determine a rail pressure correction value of the target cylinder at the time of the last injection;

[0027] a reference rail pressure obtaining unit, configured to obtain the reference rail pressure of the current working cylinder based on a rail pressure sensor provided at the fixed position;

[0028] The injection rail pressure correction unit is configured to use the sum of the reference rail pressure and the rail pressure correction value as the injection rail pressure for the next injection of the current working cylinder.

[0029] On the other hand, the present invention also provides an electronic device, including a memory and a processor, wherein:

[0030] The memory is used to store programs;

[0031] The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the injection rail pressure correction method described in any one of the possible implementations above.

[0032] On the other hand, the present invention further provides a computer-readable storage medium having a program or instruction stored thereon, which, when executed by a processor, implements the steps of the injection rail pressure correction method described in any one of the possible implementations above.

[0033] The present invention provides the following beneficial effects: The injection rail pressure correction method provided by the present invention can obtain the reference rail pressure of the current working cylinder solely through a rail pressure sensor located at a fixed position, eliminating the need for dynamic interruption to collect rail pressure. This avoids conflicts and other issues associated with dynamic interruption, further minimizing safety issues caused by uncontrolled injection pulse width and improving injection safety. Furthermore, it reduces the difficulty of BSW development, shortens the project development cycle, simplifies BSW functionality, and improves its reliability.

[0034] Furthermore, the present invention determines a target cylinder corresponding to the current working cylinder through the correlation between the cylinders in the high-pressure common rail fuel system, and determines a rail pressure correction value at the time of the target cylinder's last injection. Based on the rail pressure correction value, the injection rail pressure at the time of the current working cylinder's next injection is determined. The reference rail pressure is corrected based on the rail pressure correction value, thereby improving the accuracy of the ultimately determined injection rail pressure and thereby improving the fuel injection precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic flow chart of an embodiment of the injection rail pressure correction method provided by the present invention;

[0037] Figure 2 For the present invention Figure 1 A schematic flow chart of an embodiment of step S102;

[0038] Figure 3 A schematic structural diagram of an embodiment of the injection rail pressure correction device provided by the present invention;

[0039] Figure 4 This is a schematic structural diagram of an embodiment of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0040] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] It should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present invention illustrate operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps that have no logical contextual relationship can be reversed in order or implemented simultaneously. In addition, those skilled in the art, guided by the content of the present invention, can add one or more other operations to the flowcharts or remove one or more operations from the flowcharts. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and / or processor systems and / or microcontroller systems.

[0042] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] The present invention provides an injection rail pressure correction method, device, electronic device and storage medium, which are described below respectively.

[0044] The embodiment of the present invention provides an injection rail pressure correction method, which is applied to a high-pressure common rail fuel system. The high-pressure common rail fuel system includes a current working cylinder and multiple cylinders to be worked, such as Figure 1 As shown, the injection rail pressure correction method includes:

[0045] S101, determining a target cylinder corresponding to a current working cylinder among multiple cylinders to be worked;

[0046] S102, determining a rail pressure correction value of the target cylinder during the last injection;

[0047] S103, obtaining a reference rail pressure of the current working cylinder based on a rail pressure sensor provided at a fixed position;

[0048] S104 : The sum of the reference rail pressure and the rail pressure correction value is used as the injection rail pressure for the next injection of the current working cylinder.

[0049] The currently working cylinder refers to a cylinder that is currently performing an injection action, and the waiting-to-work cylinder refers to a cylinder that has already performed an injection action.

[0050] It should be understood that injection includes pilot injection, main injection, and post-injection. The injection rail pressure in step S104 includes the pilot injection rail pressure, main injection rail pressure, and post-injection rail pressure corresponding to the pilot injection, main injection, and post-injection, respectively. The rail pressure correction value then includes the pilot rail pressure correction value, the main injection rail pressure correction value, and the post-injection rail pressure correction value.

[0051] In a specific embodiment of the present invention, the fixed position is the top dead center, which refers to the position where the piston reaches the highest point when the piston moves in the cylinder.

[0052] It should be noted that the fixed position may also be other positions besides the top dead center, which will not be described in detail here.

[0053] Compared to existing technologies, the injection rail pressure correction method provided by the present invention relies solely on a fixed-position rail pressure sensor to obtain the current working cylinder's reference rail pressure. This eliminates the need for dynamic interruption for rail pressure acquisition, avoiding conflicts and other issues inherent in dynamic interruption. This in turn avoids safety issues caused by uncontrolled injection pulse width, improving injection safety. Furthermore, this method reduces the difficulty of BSW development, shortens project development cycles, simplifies BSW functionality, and improves its reliability.

[0054] Furthermore, the embodiment of the present invention determines a target cylinder corresponding to the current working cylinder through the correlation between the cylinders in the high-pressure common rail fuel system, and determines a rail pressure correction value at the time of the target cylinder's previous injection. Based on the rail pressure correction value, the injection rail pressure at the time of the current working cylinder's next injection is determined. The reference rail pressure is corrected based on the rail pressure correction value, thereby improving the accuracy of the ultimately determined injection rail pressure and thereby improving the fuel injection precision.

[0055] In actual application scenarios, the high-pressure common rail fuel system can be divided into a synchronous pumping / injection system or an asynchronous pumping / injection system according to the pumping and injection cycles. The synchronous pumping / injection system refers to a system in which oil is injected once for every pumping, and the number of pumping times and injection times are the same, and its rail pressure cycle is constant. The asynchronous pumping / injection system refers to a system in which the number of pumping times and injection times are different, and its rail pressure cycle fluctuates.

[0056] To accurately determine the injection rail pressure of the synchronous pump / injection system and the asynchronous pump / injection system, in some embodiments of the present invention, step S101 is specifically as follows:

[0057] When the high-pressure common rail fuel system is a pump / injection synchronous system, the target cylinder is the first cylinder;

[0058] When the high-pressure common rail fuel system is an asynchronous pumping / injection system, injection characteristics of the high-pressure common rail fuel system are obtained, and the target cylinder is determined based on the correlation of the injection characteristics.

[0059] Because the rail pressure state of each cylinder in a synchronous pump / injection system is consistent, all cylinders can make injection rail pressure corrections based on the rail pressure correction value of the target cylinder. However, in an asynchronous pump / injection system, the rail pressure state of each cylinder is not completely consistent. Therefore, the target cylinder with the strongest correlation with the current active cylinder is selected from the active cylinders to ensure the accuracy of the injection rail pressure.

[0060] The embodiment of the present invention separately sets the target cylinder determination method in the oil pumping / injection synchronous system and the oil pumping / injection asynchronous system to find the correlation between the cylinders, solves the problem of inconsistent injection amount when the oil injection / injection is asynchronous, and ensures the accuracy of the determined injection rail pressure.

[0061] It should be noted that the target cylinder refers to a cylinder with the same operating similarity as the current working cylinder, that is, the rail pressure correction value of the target cylinder is the same as the rail pressure correction value of the current working cylinder. In other words, the injection rail pressure of the current working cylinder can be corrected based on the rail pressure correction value of the target cylinder.

[0062] In a specific embodiment of the present invention, the injection characteristics include a pumping period, an injection period, an interval angle between two cylinders, and an ignition sequence.

[0063] Based on the above injection characteristics, the specific process of determining the target cylinder is as follows:

[0064] The lowest common multiple of the pumping cycle and the injection cycle is calculated, and the ratio of the lowest common multiple to the interval angle between the two cylinders is calculated. The target cylinder is determined based on the ratio and the firing order.

[0065] In some embodiments of the present invention, Figure 2 As shown, step S102 includes:

[0066] S201, obtaining at least one sampled rail pressure of the target cylinder during the last injection, collected by a rail pressure sensor;

[0067] S202, determining a rail pressure average of at least one sampled rail pressure;

[0068] S203 , obtaining a target reference rail pressure at the time of the last injection of the target cylinder based on a rail pressure sensor provided at a fixed position, and taking the difference between the target reference rail pressure and the mean rail pressure as a rail pressure correction value.

[0069] The embodiment of the present invention calculates the rail pressure correction value based on the rail pressure average value of at least one sampled rail pressure, thereby ensuring the accuracy of the rail pressure correction value and further ensuring the accuracy of the determined injection rail pressure.

[0070] It should be understood that the more rail pressure samples are taken, the more accurate the rail pressure correction value is, but the rail pressure sensor has a higher precision requirement. In a specific embodiment of the present invention, the sampling interval of at least one rail pressure sample is 0.1 milliseconds.

[0071] In some embodiments of the present invention, step S103 is specifically as follows:

[0072] The peak rail pressure or average rail pressure of the current working cylinder is obtained based on a rail pressure sensor arranged at a fixed position, and the peak rail pressure or average rail pressure is used as the reference rail pressure.

[0073] Since the purpose of determining the injection rail pressure is to determine the injection pulse width to achieve injection control, in some embodiments of the present invention, after step S104, the following steps are further included:

[0074] The injection pulse width is determined based on the injection rail pressure, and the pulse width of the next injection of the current working cylinder is controlled to be the injection pulse width.

[0075] The embodiment of the present invention achieves accurate control of the next injection by determining the injection pulse width based on the injection rail pressure.

[0076] In a specific embodiment of the present invention, a 6-cylinder diesel engine is used as an example. Its pumping cycle and injection cycle are consistent, both of which are 120 crankshaft angles. Its ignition sequence is 1-5-3-6-2-4. The specific process of its injection pulse width is as follows:

[0077] 1. When the engine reaches a fixed angle before the top dead center of cylinder 1 (e.g., 78 degrees crank angle), the ECU collects the current actual rail pressure p1_cyl1 (the rail pressure can be the peak or average rail pressure within a 120-degree crank angle range);

[0078] 2. When the engine performs pilot injection on cylinder 1, collect and record the rail pressure sampled 0.1ms. If there are multiple rail pressures of 0.1ms corresponding to the injection pulse width, take the average value to obtain the rail pressure p_pilot_cyl1;

[0079] 3. When the engine performs the main injection of cylinder 1, collect and record the rail pressure sampled 0.1ms. If there are multiple 0.1ms rail pressures corresponding to the injection pulse width, take the average value to obtain the rail pressure p_main_cyl1;

[0080] 4. When the engine performs post injection on cylinder 1, collect and record the rail pressure sampled 0.1ms. If there are multiple 0.1ms rail pressures corresponding to the injection pulse width, take the average value to obtain the rail pressure p_post_cyl1;

[0081] 5. Calculate the corrected rail pressure for each injection:

[0082] p_pilot_cor_cyl1 = p1_cyl1-p_pilot_cyl1;

[0083] p_main_cor_cyl1 = p1_cyl1-p_main_cyl1;

[0084] p_post_cor_cyl1 = p1_cyl1-ppost_cyl1;

[0085] 6. When the engine reaches a fixed angle before the top dead center of cylinder 5 (e.g., 78 degrees crank angle), the ECU collects the current actual rail pressure p1_cyl5 (the rail pressure can be the peak or average rail pressure within the 120-degree crank angle range);

[0086] 7. Calculate the injection rail pressure for each injection at this time:

[0087] a) Pilot injection rail pressure: p_pilot_inj5 = p1_cyl5-p_pilot_cor_cyl1;

[0088] b) Main injection rail pressure: p_main_inj5 = p1_cyl5 - p_main_cor_cyl1;

[0089] c) Post-injection rail pressure: p_post_inj5 = p1_cyl5-p_post_cor_cyl1;

[0090] 8. Calculate the injection pulse width based on the injection rail pressure of each injection and execute the injection;

[0091] 9. The same applies to the subsequent cylinders.

[0092] In summary, the injection rail pressure correction method proposed in the embodiment of the present invention improves the accuracy of actual rail pressure acquisition and calculation, can determine the accurate injection rail pressure, and improves fuel injection accuracy.

[0093] In order to better implement the injection rail pressure correction method in the embodiment of the present invention, based on the injection rail pressure correction method, the embodiment of the present invention also provides an injection rail pressure correction device, which is applied to a high-pressure common rail fuel system. The high-pressure common rail fuel system includes a current working cylinder and multiple cylinders to be worked, such as Figure 3 As shown, the injection rail pressure correction device 300 includes:

[0094] The target cylinder determining unit 301 is used to determine a target cylinder corresponding to the current working cylinder among the multiple cylinders to be worked;

[0095] The rail pressure correction value determining unit 302 is used to determine the rail pressure correction value of the target cylinder at the time of the last injection;

[0096] A reference rail pressure obtaining unit 303 is configured to obtain a reference rail pressure of a current working cylinder based on a rail pressure sensor provided at a fixed position;

[0097] The injection rail pressure correction unit 304 is configured to use the sum of the reference rail pressure and the rail pressure correction value as the injection rail pressure for the next injection of the current working cylinder.

[0098] It should be noted that the injection rail pressure correction device 300 provided in the above embodiment can implement the technical solution described in the above embodiment of the injection rail pressure correction method. The specific implementation principles or specific implementation details of each of the above modules or units can be found in the corresponding content of the above embodiment of the injection rail pressure correction method, and will not be described in detail here.

[0099] like Figure 4As shown, the present invention also provides an electronic device 400. The electronic device 400 includes a processor 401, a memory 402 and a display 403. Figure 4 Only some of the components of the electronic device 400 are shown, but it should be understood that implementation of all of the shown components is not required, and more or fewer components may be implemented instead.

[0100] In some embodiments, the processor 401 may be a central processing unit (CPU), a microprocessor, or other data processing chip, configured to execute program codes or process data stored in the memory 402 , such as the injection rail pressure correction method of the present invention.

[0101] In some embodiments of the present invention, processor 401 may be a single server or a server group. The server group may be centralized or distributed. In some embodiments, processor 401 may be local or remote. In some embodiments, processor 401 may be implemented on a cloud platform. In one embodiment, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, multiple clouds, or any combination thereof.

[0102] In some embodiments, the memory 402 may be an internal storage unit of the electronic device 400 , such as a hard disk or memory of the electronic device 400 .

[0103] Furthermore, the memory 402 may include both an internal storage unit of the electronic device 400 and an external storage device. The memory 402 is used to store application software installed in the electronic device 400 and various data.

[0104] In some embodiments, display 403 can be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 403 is used to display information about electronic device 400 and to display a visual user interface. Components 401-403 of electronic device 400 communicate with each other via a system bus.

[0105] In some embodiments of the present invention, when the processor 401 executes the injection rail pressure correction program in the memory 402, the following steps may be implemented:

[0106] Determining a target cylinder corresponding to the current working cylinder among the plurality of cylinders to be worked;

[0107] Determine the rail pressure correction value at the time of the last injection of the target cylinder;

[0108] obtaining a reference rail pressure of a current working cylinder based on a rail pressure sensor arranged at a fixed position;

[0109] The sum of the reference rail pressure and the rail pressure correction value is used as the injection rail pressure for the next injection of the current working cylinder.

[0110] It should be understood that, when executing the injection rail pressure correction program in the memory 402 , the processor 401 may implement other functions in addition to the above functions. For details, please refer to the description of the corresponding method embodiment above.

[0111] Furthermore, the embodiment of the present invention does not specifically limit the type of electronic device 400 mentioned. The electronic device 400 may be a portable electronic device such as a mobile phone, a tablet computer, a personal digital assistant (PDA), a wearable device, or a laptop computer. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic devices may also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the present invention, the electronic device 400 may not be a portable electronic device, but may be a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0112] Accordingly, an embodiment of the present invention further provides a computer-readable storage medium, which is used to store a computer-readable program or instruction. When the program or instruction is executed by a processor, the steps or functions of the injection rail pressure correction method provided by the above-mentioned method embodiments can be implemented.

[0113] Those skilled in the art will appreciate that all or part of the process flow of the above-described method embodiment can be implemented by instructing related hardware (such as a processor, controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0114] The above describes in detail an injection rail pressure correction method, device, electronic device, and storage medium provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art may vary in the specific implementation methods and application scope based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for correcting injection rail pressure, characterized in that: Applied to a high-pressure common rail fuel system, the high-pressure common rail fuel system includes a currently working cylinder and multiple cylinders to be worked; the method includes: determining a target cylinder corresponding to the current working cylinder among the plurality of cylinders to be worked; determining a rail pressure correction value of the target cylinder at the time of the last injection; obtaining a reference rail pressure of the current working cylinder based on a rail pressure sensor arranged at a fixed position; The sum of the reference rail pressure and the rail pressure correction value is used as the injection rail pressure during the next injection of the current working cylinder.

2. The injection rail pressure correction method according to claim 1, characterized in that: The high-pressure common rail fuel system is a synchronous pump / injection system or an asynchronous pump / injection system; determining a target cylinder corresponding to the current working cylinder among the multiple cylinders to be worked includes: When the high-pressure common rail fuel system is a synchronous pump / injection system, the target cylinder is the first cylinder; When the high-pressure common rail fuel system is an asynchronous pumping / injection system, injection characteristics of the high-pressure common rail fuel system are obtained, and the target cylinder is determined based on correlation of the injection characteristics.

3. The injection rail pressure correction method according to claim 2, characterized in that: The injection characteristics include the pumping period, the injection period, the interval angle between the two cylinders, and the ignition sequence.

4. The injection rail pressure correction method according to claim 1, characterized in that: The determining of the rail pressure correction value of the target cylinder during the last injection includes: Acquiring at least one sampled rail pressure collected by a rail pressure sensor during a last injection of the target cylinder; determining a rail pressure average of the at least one sampled rail pressure; A target reference rail pressure at the time of last injection of the target cylinder is acquired based on a rail pressure sensor provided at the fixed position, and a difference between the target reference rail pressure and the rail pressure average is used as the rail pressure correction value.

5. The injection rail pressure correction method according to claim 4, characterized in that: The sampling interval of the at least one sampled rail pressure is 0.1 millisecond.

6. The injection rail pressure correction method according to claim 1, characterized in that: The obtaining the reference rail pressure of the current working cylinder based on the rail pressure sensor provided at the fixed position includes: The peak rail pressure or the average rail pressure of the current working cylinder is obtained based on the rail pressure sensor provided at the fixed position, and the peak rail pressure or the average rail pressure is used as the reference rail pressure.

7. The injection rail pressure correction method according to claim 1, characterized in that: The method further comprises: An injection pulse width is determined based on the injection rail pressure, and a pulse width of the next injection of the current cylinder is controlled to be the injection pulse width.

8. An injection rail pressure correction device, characterized in that: Applicable to a high-pressure common rail fuel system, the high-pressure common rail fuel system includes a currently working cylinder and multiple cylinders to be worked; the device includes: a target cylinder determining unit, configured to determine a target cylinder corresponding to the current working cylinder among the plurality of cylinders to be worked; a rail pressure correction value determining unit, configured to determine a rail pressure correction value of the target cylinder at the time of the last injection; a reference rail pressure obtaining unit, configured to obtain the reference rail pressure of the current working cylinder based on a rail pressure sensor provided at a fixed position; The injection rail pressure correction unit is configured to use the sum of the reference rail pressure and the rail pressure correction value as the injection rail pressure for the next injection of the current working cylinder.

9. An electronic device, characterized in that: comprising a memory and a processor, wherein, The memory is used to store programs; The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the injection rail pressure correction method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the injection rail pressure correction method according to any one of claims 1 to 7 are implemented.

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