Fuel injector stuck diagnosis method, device and computer-readable storage medium

Abstract

The present invention specifically relates to a method, device and computer-readable storage medium for diagnosing a stuck injector. The method for diagnosing a stuck injector increases resistance in the discharge circuit of each injector. The setting of the resistance prolongs the discharge current of the injector until the injector armature is seated. The control switch of a single injector in the injector drive circuit is turned off, the armature of the injector falls, the ball valve "seats" to release the control hole, and the induced current of the coil is released through the discharge circuit to generate an induced current. Since the armature falling process is actually the process of cutting the magnetic flux lines of the coil, another induced electromotive force will be generated during the armature falling process, so two peak currents i1 and i2 can be detected on the detection circuit. The present application accurately judges the armature stuck by the induced current when the injector ball valve is "seated", and judges the stuck needle valve stem by combining the rail pressure, so as to accurately judge the stuck fault of the injector.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel injectors, and particularly to a method and device for diagnosing fuel injector jamming and a computer-readable storage medium. Background Art

[0002] The information provided in this section is only background information related to the present disclosure and does not necessarily represent prior art.

[0003] Fuel injectors play a crucial role in the performance and emissions of electronically controlled diesel engines. The internal structure of fuel injectors is relatively precise and complex. In China, the quality of diesel is relatively uneven, resulting in a high failure rate of fuel injectors. Impurities and water in diesel are likely to cause jamming of fuel injectors (armature and needle valve rod).

[0004] In the past, the method for diagnosing fuel injector jamming mainly judged by the coordination of the common rail pressure and the operation of the fuel injector. However, this method is easily confused with the blockage fault of the fuel injector's inlet and return pipelines, resulting in misjudgment. Summary of the Invention

[0005] The present invention provides a fuel injector jamming diagnosis circuit, aiming to at least solve the technical problem of easy misjudgment in the existing fuel injector jamming diagnosis method. This aim is achieved through the following technical solutions:

[0006] The first aspect of the present invention proposes a method for diagnosing fuel injector jamming, which is implemented according to the fuel injector jamming diagnosis circuit proposed in the first aspect of the present invention, and includes the following steps:

[0007] Control the fuel injector to start;

[0008] Receive the rail pressure change signal of the fuel injector;

[0009] Control the fuel injector to close, and receive the peak current signal of the fuel injector jamming diagnosis circuit. The fuel injector jamming diagnosis circuit is used for the fuel injector drive circuit. The fuel injector drive circuit includes a discharge circuit, and the discharge circuit is used to release the induced current of the fuel injector coil. The fuel injector jamming diagnosis circuit includes a resistor, a current sampling circuit, and a single-chip microcomputer. The current sampling circuit is connected in parallel with the resistor, and the single-chip microcomputer is connected to the current sampling circuit;

[0010] Judge whether the fuel injector is jammed according to the rail pressure change signal and the peak current signal;

[0011] Among them, the step of judging whether the fuel injector is jammed according to the rail pressure change signal and the peak current signal includes:

[0012] If the rail pressure change signal is less than or equal to a preset rail pressure change threshold, send out an alarm signal for fuel injector failure;

[0013] The step of issuing an injector fault alarm signal according to the rail pressure change signal being less than or equal to a preset rail pressure change threshold comprises:

[0014] According to the rail pressure change signal being less than or equal to a preset rail pressure change threshold value and receiving two peak current signals, issuing an injector needle valve stem stuck fault alarm signal;

[0015] The step of issuing an injector fault alarm signal according to the rail pressure change signal being less than or equal to a preset rail pressure change threshold comprises:

[0016] According to the rail pressure change signal being less than or equal to the preset rail pressure change threshold and the two peak current signals not being received, an injector armature stuck fault alarm signal or an injector inlet and outlet oil pipeline blockage alarm signal is issued.

[0017] The injector stuck diagnosis method proposed in the first aspect of the present invention adds a resistor to the discharge circuit of each injector. The setting of the resistor prolongs the discharge current of the injector until the injector armature is seated. The control switch of a single injector in the injector drive circuit is turned off, the armature of the injector falls, the ball valve "seats" to release the control hole, and the induced current of the coil is released through the discharge circuit to generate an induced current. Since the armature falling process is actually the process of cutting the magnetic flux lines of the coil, another induced electromotive force will be generated during the armature falling process, so two peak currents i1 and i2 can be detected in the detection circuit. The present application accurately judges the armature stuck by the induced current when the injector ball valve is "seated", and judges the stuck needle valve stem in combination with the rail pressure, so as to accurately judge the stuck fault of the injector.

[0018] In some embodiments, the step of controlling the start of the fuel injector further includes the following steps:

[0019] receiving engine speed fluctuation signals and rail pressure fluctuation signals;

[0020] According to the engine speed fluctuation signal indicating that the engine speed fluctuation is within a preset speed fluctuation range, and the rail pressure fluctuation signal indicating that the rail pressure fluctuation is within a preset rail pressure fluctuation range, the next step is performed.

[0021] In some embodiments, the step of determining whether the injector is stuck according to the rail pressure change signal and the peak current signal comprises:

[0022] According to the rail pressure change signal being greater than a preset rail pressure change threshold and two peak current signals being received, a fuel injector normal signal is issued.

[0023] In some embodiments, the step of determining whether the injector is stuck according to the rail pressure change signal and the peak current signal further includes the following steps:

[0024] Re - execute the injector sticking diagnosis method for the remaining injectors until the injector sticking diagnosis method is completed for all injectors.

[0025] The second aspect of the present invention proposes an injector sticking diagnosis device, including:

[0026] A sampling module, configured to sample the peak current on the discharge circuit of the injector;

[0027] A receiving module, configured to receive the rail pressure change signal of the injector and the peak current signal of the sampling module;

[0028] A judgment module, configured to judge whether the injector has a sticking fault according to the rail pressure change signal and the peak current signal;

[0029] An alarm module, configured to give an alarm according to the judgment result of the judgment module.

[0030] The injector sticking diagnosis device proposed in the second aspect of the present invention has the same beneficial effects as the injector sticking diagnosis method proposed in the second aspect of the present invention, which will not be elaborated here.

[0031] The third aspect of the present invention proposes a computer - readable storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the injector sticking diagnosis method as proposed in the first aspect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as limiting the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0033] Figure 1 is a schematic structural diagram of an injector sticking diagnosis circuit according to an embodiment of the present invention.

[0034] Figure 2 is a schematic diagram of the working state of an existing injector drive circuit.

[0035] Figure 3 is a schematic diagram of the working state of an injector drive circuit according to an embodiment of the present invention.

[0036] Figure 4 is a schematic flowchart of an injector sticking diagnosis method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0038] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" as used herein may also include the plural forms. The terms "comprising", "including" and "having" are inclusive and thus specify the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.

[0039] Although the terms first, second, etc. may be used in this document to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and "third" and other numerical terms do not imply an order or sequence when used in this document. Additionally, in the description of the present invention, unless otherwise clearly specified and defined, the terms "arranged" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] For ease of description, spatial relative relationship terms may be used in this document to describe the relationship of one element or feature shown in the figure relative to another element or feature, such as "above", "inside", "adjacent" and the like. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is flipped, the element described as "below other elements or features" or "beneath other elements or features" will then be oriented "above other elements or features" or "over other elements or features". Thus, the exemplary term "below" can include both the above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in this document are interpreted accordingly.

[0041] As Figure 1As shown, the first aspect of the present invention provides an injector stuck diagnostic circuit, which is used in an injector drive circuit. The injector drive circuit includes a discharge circuit, which is used to release the induction current of the injector coil. The injector stuck diagnostic circuit includes:

[0042] A resistor provided in the discharge circuit;

[0043] A current sampling circuit connected in parallel with the resistor;

[0044] A microcontroller connected to the current sampling circuit.

[0045] It can be understood that in the injector drive circuit, VS2 is powered by 48V, which is mainly used to provide a large current to the injector to quickly open the injector. T2 and T3 are its switches (MOS three-stage tubes, the same below). Taking the six-cylinder engine as an example, three injectors share T2 or T3. VS1 is powered by 24V, which is mainly used to provide continuous current to keep the injector open. T1 and T4 are its switches. Similarly, three injectors share. T5~T10 are the low-end switches of each injector, which are used to select the injector to be opened.

[0046] The fuel injector is a coil, which is essentially a resistance and inductance circuit. When the fuel injector is opened and then closed, an induced electromotive force will be generated. Therefore, the diode and circuit above each injector switch T5~T10 provide a discharge circuit for each injector.

[0047] The injector stuck diagnostic circuit proposed in the first aspect of the present invention adds a resistor to the discharge circuit of each injector. The setting of the resistor prolongs the discharge current of the injector until the injector armature is seated.

[0048] According to the working principle of conventional fuel injectors and the characteristics of the driving circuit, taking the opening and closing of one of the fuel injectors as an example, the specific working process before improving the circuit is: T2 and T5 are opened, providing the maximum current for the coil to drive the armature to lift, the ball valve leaves the release control hole, the fuel leaks from the release control hole, the needle valve stem is lifted under the pressure of the high-pressure fuel, and the fuel is sprayed out from the spray hole. T1 is opened and T2 is closed, providing the coil with a holding current, and the fuel is continuously sprayed out from the spray hole. T1, T2, and T5 are closed at the same time, the armature falls, the ball valve "seats" on the release control hole, and the induced current of the coil is released through the release circuit to generate an induced current i1. The entire action process is as follows Figure 2 shown.

[0049] After the injector drive circuit of the present invention is provided with an injector stuck diagnostic circuit, since the armature falling process is actually the process of cutting the coil magnetic flux lines, another induced electromotive force will be generated in the armature falling process, so two peak currents i1 and i2 can be detected in the current sampling circuit, such as Figure 3The states of i1 and i2 can be used to determine whether the injector armature is stuck, and combined with the fluctuation of rail pressure, it can be further determined whether the needle valve stem is stuck.

[0050] like Figure 4 As shown, the second aspect of the present invention provides a method for diagnosing a stuck injector, which is implemented according to the injector stuck diagnostic circuit provided by the first aspect of the present invention, and includes the following steps:

[0051] Control the start of the fuel injector;

[0052] Receive rail pressure change signal from injector;

[0053] Control the fuel injector to close and receive the peak current signal of the injector stuck diagnosis circuit;

[0054] Determine whether the injector is stuck based on the rail pressure change signal and peak current signal.

[0055] It is understandable that the start of the injector can be controlled by the ECU to control the microcontroller of the injector drive circuit and then control the start of the injector. The rail pressure change signal of the injector can be obtained by the pressure sensor of the common rail pipe. The rail pressure change signal is obtained by monitoring the front and rear rail pressures of the common rail pipe within a preset time period. The peak current signal is obtained according to the sampling circuit of the injector jam diagnosis circuit and received by the microcontroller connected to the sampling circuit. The pressure change of the common rail pipe can be reflected according to the rail pressure change signal, and then it can be concluded whether the pressure of the common rail pipe is normal. If it is abnormal, it can be inferred that the injector is jammed or blocked or the oil circuit has a blockage fault that affects the fuel flow, thereby affecting the pressure of the common rail pipe. By monitoring the peak current signal, it can be inferred whether the armature and valve stem of the injector have produced the action of cutting the magnetic flux lines of the coil, and then determine whether the injector is jammed.

[0056] The injector stuck diagnosis method proposed in the second aspect of the present invention adds a resistor to the discharge circuit of each injector. The setting of the resistor prolongs the discharge current of the injector until the injector armature is seated. The control switch of a single injector in the injector drive circuit is turned off, the armature of the injector falls, the ball valve "seats" to release the control hole, and the induced current of the coil is released through the discharge circuit to generate an induced current. Since the armature falling process is actually the process of cutting the magnetic flux lines of the coil, another induced electromotive force will be generated during the armature falling process, so two peak currents i1 and i2 can be detected in the detection circuit. The present application accurately judges the armature stuck by the induced current when the injector ball valve is "seated", and judges the stuck needle valve stem by combining the rail pressure, so as to accurately judge the stuck fault of the injector.

[0057] In some embodiments, the step of controlling the start of the fuel injector further includes the steps of:

[0058] receiving engine speed fluctuation signals and rail pressure fluctuation signals;

[0059] Based on the engine speed fluctuation signal indicating that the engine speed fluctuation is within a preset engine speed fluctuation range, and the rail pressure fluctuation signal indicating that the rail pressure fluctuation is within a preset rail pressure fluctuation range, the next step is carried out.

[0060] Specifically, before diagnosing whether the injector is stuck, it is necessary to determine whether the engine is running stably to exclude other factors that affect the judgment of whether the injector is stuck. At this time, the engine speed and rail pressure are monitored. When the engine speed and rail pressure are within the preset fluctuation range, it indicates that the engine is running stably. At this time, it is possible to further diagnose whether the injector is stuck.

[0061] In some embodiments, the steps of judging whether the injector is stuck according to the rail pressure change signal and the peak current signal include:

[0062] Based on the rail pressure change signal being greater than a preset rail pressure change threshold and receiving two peak current signals, an injector normal indication is reported.

[0063] It can be understood that when the rail pressure change signal is greater than the preset rail pressure change threshold, it can be determined that the operating pressure of the engine fuel system is normal and the fuel circuit is unblocked without blockage. At this time, it is possible to further judge the stickiness according to the peak current signal collected by the injector stickiness diagnosis circuit. In the case where two peak current signals can be received, it can be inferred that the first induced electromotive force i1 is generated after the injector is closed, and the armature of the injector cuts the magnetic induction line of the coil during the falling process, generating the second induced electromotive force i2. Therefore, two peak current i1 and i1 can be detected on the diagnosis circuit. It can be seen that the armature and valve stem of the injector are operating normally without sticking.

[0064] In some embodiments, the steps of judging whether the injector is stuck according to the rail pressure change signal and the peak current signal include:

[0065] Based on the rail pressure change signal being less than or equal to the preset rail pressure change threshold, an injector fault alarm is reported.

[0066] It can be seen that in the case where the rail pressure change signal is small, the fuel circuit of the fuel system is in an abnormal state. At this time, the fuel circuit may be blocked, or the injector may be stuck, resulting in the fuel not being ejected, thereby causing a small change in the rail pressure before and after the injector injects fuel. According to the monitoring result of the rail pressure change signal, an alarm can be issued at this time to remind the driver to pay attention to the possible failure of the fuel system.

[0067] In some embodiments, the steps of reporting an injector fault alarm based on the rail pressure change signal being less than or equal to the preset rail pressure change threshold include:

[0068] Report an injector needle valve rod jamming fault alarm when the rail pressure change signal is less than or equal to the preset rail pressure change threshold and two peak current signals are received.

[0069] It can be understood that when the rail pressure change signal is less than or equal to the preset rail pressure change threshold and two peak current signals are received, it can be inferred that the change in rail pressure before and after the injector sprays fuel is small. Combining the two received peak current signals, it can be known that the armature of the injector operates normally, while the needle valve rod jams, resulting in the injector being unable to spray fuel, making the change in rail pressure small.

[0070] In some embodiments, the step of reporting an injector fault alarm according to the rail pressure change signal being less than or equal to the preset rail pressure change threshold includes:

[0071] Report an injector armature jamming fault alarm or an injector inlet and outlet pipeline blockage alarm when the rail pressure change signal is less than or equal to the preset rail pressure change threshold and two peak current signals are not received.

[0072] It can be understood that when the rail pressure change signal is less than or equal to the preset rail pressure change threshold and two peak current signals are not received, it can be inferred that the change in rail pressure before and after the injector sprays fuel is small, and the armature has no action after the injector sprays fuel. Furthermore, it can be known that the armature jams and cannot cut the magnetic induction lines of the coil to generate a peak current signal, or it may be that the fuel system's oil pipeline is blocked, resulting in a small change in rail pressure before and after the injector sprays fuel.

[0073] In some embodiments, after the step of judging whether the injector is jammed according to the rail pressure change signal and the peak current signal, the following steps are further included:

[0074] Re - execute the injector jamming diagnosis method for the remaining injectors until the injector jamming diagnosis method is completed for all injectors. If all injectors are detected once in each driving cycle, it ends; otherwise, re - execute the injector jamming diagnosis method. This enables all injectors of the engine to be subjected to jamming diagnosis, improving the adaptability and safety of the engine.

[0075] A third aspect of the present invention proposes an injector jamming diagnosis device, including:

[0076] A sampling module for sampling the peak current on the discharge circuit of the injector;

[0077] A receiving module for receiving the rail pressure change signal of the injector and the peak current signal of the sampling module;

[0078] A judging module for judging whether the injector has a jamming fault according to the rail pressure change signal and the peak current signal;

[0079] An alarm module for alarming according to the judgment result of the judging module.

[0080] The injector sticking diagnosis device proposed in the third aspect of the present invention has the same beneficial effects as the injector sticking diagnosis circuit proposed in the first aspect of the present invention, and will not be elaborated here.

[0081] The fourth aspect of the present invention proposes a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the injector sticking diagnosis method proposed in the second aspect of the present invention.

[0082] The flow of the gear position recognition method of the present invention is as follows:

[0083] S1: Monitor that the engine speed, rail pressure, etc. meet the conditions (the speed fluctuation and rail pressure fluctuation are within a certain range), and record the rail pressure P1 when the injector is not opened.

[0084] S2: Open injector A (for example, T5 is opened, and T2 and T1 are opened in sequence), and record the rail pressure P2.

[0085] S3: If P1 - P2 exceeds a certain range and two peak currents i1 and i2 can be detected after injector A is closed, then the injector is normal.

[0086] S4: If P1 - P2 does not exceed a certain range, then determine whether two peak currents i1 and i2 can be detected after injector A is closed. If they can be detected, go to S5; otherwise, go to S6.

[0087] S5: Determine the sticking fault of the injector A needle valve stem and indicate it in the form of a fault.

[0088] S6: Determine the sticking of the injector A armature or the blockage fault of the injector inlet and outlet pipelines and indicate it in the form of a fault.

[0089] S7: If all injectors are detected once in each driving cycle, then end; otherwise, go to S1.

[0090] Those skilled in the art will further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this interchangeability of hardware and software, the various illustrative components, boxes, modules, circuits, and steps are described above in terms of their functionality in a general sense. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Skilled artisans may implement the described functionality in different ways for each specific application, but such implementation decisions should not be construed as departing from the scope of the present invention.

[0091] The various illustrative logical modules and circuits described in connection with the embodiments disclosed herein can be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0092] In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted via a computer readable medium as one or more instructions or code. The computer readable medium includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer readable medium. For example, if the software is transmitted from a web site, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks typically reproduce data magnetically, while discs reproduce data optically with lasers. The above combination should also be included within the scope of computer readable media.

[0093] As described above, only the preferred specific embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for diagnosing injector jamming, characterized in that, Including the following steps: Control the start of the fuel injector; Receive the rail pressure change signal of the fuel injector; Control the fuel injector to close, and receive the peak current signal of the fuel injector stalling diagnosis circuit. The fuel injector stalling diagnosis circuit is used for the fuel injector drive circuit. The fuel injector drive circuit includes a discharge circuit, and the discharge circuit is used to release the induced current of the fuel injector coil. The fuel injector stalling diagnosis circuit includes a resistor, a current sampling circuit and a single-chip microcomputer. The current sampling circuit is connected in parallel with the resistor, and the single-chip microcomputer is connected to the current sampling circuit; Judge whether the fuel injector is stuck according to the rail pressure change signal and the peak current signal; Among them, the step of judging whether the fuel injector is stuck according to the rail pressure change signal and the peak current signal includes: According to the rail pressure change signal being less than or equal to the preset rail pressure change threshold, send out a fuel injector fault alarm signal; The step of sending out a fuel injector fault alarm signal according to the rail pressure change signal being less than or equal to the preset rail pressure change threshold includes: According to the rail pressure change signal being less than or equal to the preset rail pressure change threshold and receiving two of the peak current signals, send out a fuel injector needle valve rod stalling fault alarm signal; The step of sending out a fuel injector fault alarm signal according to the rail pressure change signal being less than or equal to the preset rail pressure change threshold includes: According to the rail pressure change signal being less than or equal to the preset rail pressure change threshold and not receiving two of the peak current signals, send out a fuel injector armature stalling fault alarm signal or a fuel injector inlet and outlet pipeline blockage alarm signal.

2. The injector sticking diagnosis method according to claim 1, characterized in that Before the step of controlling the fuel injector to start, there is also a step: Receive the engine speed fluctuation signal and the rail pressure fluctuation signal; According to the engine speed fluctuation signal indicating that the engine speed fluctuation is within the preset speed fluctuation range, and the rail pressure fluctuation signal indicating that the rail pressure fluctuation is within the preset rail pressure fluctuation range, proceed to the next step.

3. The injector sticking diagnosis method according to claim 1, wherein, The step of judging whether the fuel injector is stuck according to the rail pressure change signal and the peak current signal includes: According to the rail pressure change signal being greater than the preset rail pressure change threshold and receiving two of the peak current signals, send out a fuel injector normal signal.

4. The injector sticking diagnosis method according to any one of claims 1 to 3, characterized in that, After the step of judging whether the fuel injector is stuck according to the rail pressure change signal and the peak current signal, there is also a step: Re-execute the fuel injector stalling diagnosis method for the remaining fuel injectors until all fuel injectors have completed the fuel injector stalling diagnosis method.

5. An injector stuck diagnosis device, characterized in that Including: A sampling module for sampling the peak current on the discharge circuit of the fuel injector; A receiving module for receiving the rail pressure change signal of the fuel injector and the peak current signal of the sampling module; A judging module for judging whether the fuel injector has a stalling fault according to the rail pressure change signal and the peak current signal; An alarm module for alarming according to the judgment result of the judging module; Wherein, the determination module is further configured to issue a stuck injector needle valve rod fault alarm signal according to that the rail pressure change signal is less than or equal to a preset rail pressure change threshold value and two peak current signals are received, and issue a stuck injector armature fault alarm signal or a stuck injector inlet and outlet pipeline blockage alarm signal according to that the rail pressure change signal is less than or equal to a preset rail pressure change threshold value and two peak current signals are not received.

6. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the program is executed by a processor, the injector stuck diagnosis method according to any one of claims 2 to 4 is implemented.

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