Diesel engine fault diagnosis methods, devices, diesel engines and storage media
By converting the cylinder head vibration and in-cylinder combustion pressure signals of a diesel engine into angular domain signals, extracting feature parameters and comparing them with diagnostic rules, the accuracy problem of existing diesel engine fault diagnosis methods is solved, and more efficient fault identification and maintenance prevention are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- THE 711TH RES INST OF CHINA STATE SHIPBUILDING CORP
- Filing Date
- 2022-02-25
- Publication Date
- 2026-07-31
AI Technical Summary
Among existing diesel engine fault diagnosis methods, vibration monitoring has a low signal-to-noise ratio and is easily affected by the environment, while cylinder pressure monitoring has limited characteristic parameters, resulting in low accuracy of fault diagnosis.
By acquiring the original signals of cylinder head vibration and in-cylinder combustion pressure of the diesel engine, converting them into angular domain signals, and extracting vibration and cylinder pressure characteristic parameters, the fault type is determined by comparing them with the fault diagnosis rule table.
It improves the accuracy of diesel engine fault diagnosis, enabling the earlier detection of potential faults, reducing downtime risks, and lowering maintenance costs.
Smart Images
Figure CN116698428B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of diesel engine fault diagnosis technology, and more specifically to a diesel engine fault diagnosis method, apparatus, diesel engine, and storage medium. Background Technology
[0002] Diesel engines, as the most thermally efficient, energy-saving, and energy-efficient type of power machinery currently used in industrial applications, are the main power source for equipment such as automobiles, agricultural machinery, construction machinery, ships, internal combustion locomotives, geological and oil drilling rigs, military equipment, general equipment, mobile and backup power stations, and play a vital role in production, daily life, and the national economy. However, diesel engines have a complex structure and are prone to various types of malfunctions. A failure in any component often leads to work stoppages and production shutdowns, resulting in significant economic losses.
[0003] Therefore, effective fault diagnosis helps users discover potential faults early, take timely and effective measures, increase the reliability and safety of diesel engines, prevent sudden accidents, and reduce diesel engine maintenance costs. Traditional technologies often employ vibration monitoring or cylinder pressure monitoring to diagnose diesel engine faults. Cylinder pressure monitoring directly measures the changes in combustion pressure inside the diesel engine cylinder using a cylinder pressure sensor, providing accurate monitoring of combustion performance. However, the characteristic parameters obtained from the pressure curve alone are limited, and the types of faults that can be detected are relatively few. Vibration monitoring can extract more characteristic parameters from the vibrations and impacts generated during valve closure, valve opening, and combustion, providing comprehensive coverage of the diesel engine's operating cycle. However, due to the numerous moving parts inside the diesel engine, vibration signals and noise from different components are often mixed together. Furthermore, when the vibration signals from inside the diesel engine are transmitted to the vibration sensor mounted on the engine surface, signal attenuation and loss may occur, resulting in a low signal-to-noise ratio and susceptibility to environmental factors. Consequently, conclusions regarding diesel engine faults based on vibration analysis are not highly reliable.
[0004] Therefore, improvements are needed to address the aforementioned issues. Summary of the Invention
[0005] This application is made to address at least one of the aforementioned problems. According to one aspect of this application, a diesel engine fault diagnosis method is provided, the method comprising:
[0006] Acquire the original signals of cylinder head vibration and cylinder combustion pressure of the diesel engine;
[0007] The original cylinder head vibration signal of the diesel engine is converted into a cylinder head vibration angular domain signal, and the original in-cylinder combustion pressure signal is converted into an in-cylinder combustion pressure angular domain signal.
[0008] Vibration characteristic parameters of the cylinder head vibration angular domain signal within a single working cycle are extracted, and cylinder pressure characteristic parameters of the in-cylinder combustion pressure angular domain signal within the same single working cycle are also extracted.
[0009] The vibration characteristic parameters and cylinder pressure characteristic parameters are compared with the fault diagnosis rule table to determine the fault type of the diesel engine.
[0010] In one embodiment of this application, converting the original cylinder head vibration signal of the diesel engine into a cylinder head vibration angular domain signal, and simultaneously converting the original in-cylinder combustion pressure signal into an in-cylinder combustion pressure angular domain signal, includes:
[0011] The periodic working process of the diesel engine is divided by using the top dead center position of the piston to convert the original cylinder head vibration signal into the cylinder head vibration angular domain signal, and the original in-cylinder combustion pressure signal into the in-cylinder combustion pressure angular domain signal.
[0012] In one embodiment of this application, the periodic operation process of the diesel engine is divided using the top dead center position of the piston, including:
[0013] The characteristics of the original cylinder head vibration signal and the original in-cylinder combustion pressure signal of the diesel engine are used to determine whether the top dead center position is the compression top dead center.
[0014] If it is the compression top dead center, then the original cylinder head vibration signal is converted into the cylinder head vibration angular domain signal according to the position of the compression top dead center, and the original in-cylinder combustion pressure signal is converted into the in-cylinder combustion pressure angular domain signal.
[0015] In one embodiment of this application, a vibration acceleration sensor is provided on the diesel engine cylinder head, and the vibration acceleration sensor is used to collect the original vibration signal of the cylinder head at a preset frequency.
[0016] In one embodiment of this application, the diesel engine is equipped with a cylinder pressure sensor, the probe of which is inserted into the cylinder from the indicator valve of the diesel engine, and the cylinder pressure sensor is used to collect the raw signal of the combustion pressure in the cylinder at a preset frequency.
[0017] In one embodiment of this application, the diesel engine is provided with a top dead center sensor, which is located at the relative position of the magnet on the flywheel of the diesel engine, and the top dead center sensor is used to collect the top dead center signal at a preset frequency.
[0018] In one embodiment of this application, the top dead center sensor includes a magnetoelectric sensor.
[0019] In one embodiment of this application, the vibration characteristic parameters include at least one of the following: exhaust valve closing impact vibration intensity, intake valve closing impact vibration intensity, combustion impact vibration intensity, combustion impact duration, and exhaust valve opening section vibration intensity.
[0020] In one embodiment of this application, the cylinder pressure characteristic parameters include at least one of the following: maximum pressure and valve opening segment curve shape.
[0021] According to another aspect of this application, a diesel engine fault diagnosis device is provided, the device comprising:
[0022] The system includes a memory and a processor, wherein the memory stores a computer program that is executed by the processor, and the computer program, when executed by the processor, causes the processor to perform the diesel engine fault diagnosis method as described above.
[0023] According to another aspect of this application, a diesel engine is provided, the diesel engine including the diesel engine fault diagnosis device as described above;
[0024] The diesel engine also includes a vibration acceleration sensor, a cylinder pressure sensor, and a top dead center sensor;
[0025] The vibration acceleration sensor is installed on the cylinder head of the diesel engine and is used to collect high-frequency cylinder head vibration raw signals at a preset frequency.
[0026] The cylinder pressure sensor is located at the indicator valve of the diesel engine, and the probe of the cylinder pressure sensor is inserted into the cylinder through the indicator valve. The cylinder pressure sensor is used to collect the raw signal of the combustion pressure in the cylinder at a preset frequency.
[0027] The top dead center sensor is located at the relative position of the magnet on the flywheel of the diesel engine, and the top dead center sensor is used to acquire the top dead center signal at a preset frequency; wherein, the top dead center sensor includes a magnetoelectric sensor.
[0028] According to another aspect of this application, a storage medium is provided, on which a computer program is stored, which, when run by a processor, causes the processor to execute the above-described diesel engine fault diagnosis method.
[0029] According to the method, apparatus, diesel engine, and storage medium of this application, the original cylinder head vibration signal and the original in-cylinder combustion pressure signal of the diesel engine are converted into cylinder head vibration angular domain signals and in-cylinder combustion pressure angular domain signals, respectively. Then, the vibration characteristic parameters and cylinder pressure characteristic parameters corresponding to the cylinder head vibration angular domain signals and the in-cylinder combustion pressure angular domain signals are extracted. Then, the vibration characteristic parameters and cylinder pressure characteristic parameters in a single working cycle are compared with a fault diagnosis rule table to determine the fault type of the diesel engine. This technical solution can improve the accuracy of fault diagnosis of diesel engines. Attached Figure Description
[0030] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the accompanying drawings, the same reference numerals generally represent the same components or steps.
[0031] Figure 1 A schematic flowchart of a diesel engine fault diagnosis method according to an embodiment of this application is shown;
[0032] Figure 2(a) shows a schematic diagram of the cylinder head vibration signal according to an embodiment of this application;
[0033] Figure 2(b) shows a schematic diagram of the cylinder pressure signal according to an embodiment of this application;
[0034] Figure 2(c) shows a schematic diagram of the top dead center signal according to an embodiment of this application;
[0035] Figure 2(d) shows a schematic diagram of dividing the periodic working process of the diesel engine using the top dead center position of the piston according to an embodiment of the present application;
[0036] Figure 2(e) shows a schematic diagram of the vibration characteristic parameters of the cylinder head vibration angular domain signal and the cylinder pressure characteristic parameters of the in-cylinder combustion pressure angular domain signal extracted in a single working cycle according to an embodiment of the present application.
[0037] Figure 3(a) shows a schematic diagram of the extraction of vibration characteristic parameters according to an embodiment of this application;
[0038] Figure 3(b) shows a schematic diagram of the extraction of cylinder pressure characteristic parameters according to an embodiment of this application;
[0039] Figure 4(a) shows a schematic diagram of the cylinder head vibration angular domain signal and the in-cylinder combustion pressure angular domain signal when an abnormality occurs in a diesel engine according to an embodiment of the present application;
[0040] Figure 4(b) shows a schematic diagram of the cylinder head vibration angular domain signal and the in-cylinder combustion pressure angular domain signal of a diesel engine under normal conditions according to an embodiment of the present application;
[0041] Figure 5 A schematic block diagram of a diesel engine fault diagnosis device according to an embodiment of this application is shown. Detailed Implementation
[0042] To make the objectives, technical solutions, and advantages of this application more apparent, exemplary embodiments according to this application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. Based on the embodiments of this application described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of this application.
[0043] Based on the aforementioned technical problems, this application provides a diesel engine fault diagnosis method. The method includes: acquiring raw cylinder head vibration signals and raw in-cylinder combustion pressure signals of a diesel engine; converting the raw cylinder head vibration signals into cylinder head vibration angular domain signals, and simultaneously converting the raw in-cylinder combustion pressure signals into in-cylinder combustion pressure angular domain signals; extracting vibration characteristic parameters of the cylinder head vibration angular domain signals within a single working cycle, and simultaneously extracting cylinder pressure characteristic parameters of the in-cylinder combustion pressure angular domain signals within the same working cycle; comparing the vibration characteristic parameters and cylinder pressure characteristic parameters with a fault diagnosis rule table to determine the fault type of the diesel engine. The method of this invention can improve the accuracy of diesel engine fault diagnosis.
[0044] The following describes in detail the diesel engine fault diagnosis method according to embodiments of this application, with reference to the accompanying drawings. Unless otherwise specified, the features of the various embodiments of this application can be combined with each other.
[0045] Figure 1 A schematic flowchart of a diesel engine fault diagnosis method according to an embodiment of this application is shown; as follows: Figure 1 As shown, the diesel engine fault diagnosis method 100 according to an embodiment of this application may include the following steps S101, S102, S103 and S104:
[0046] In step S101, the original signals of cylinder head vibration and cylinder combustion pressure of the diesel engine are acquired.
[0047] In one example, a vibration acceleration sensor is installed on the cylinder head of the diesel engine. The vibration acceleration sensor is used to collect the original vibration signal of the cylinder head at a preset frequency. Figure 2(a) shows a schematic diagram of the cylinder head vibration signal collected by the vibration acceleration sensor.
[0048] In one example, the diesel engine is equipped with a cylinder pressure sensor. The probe of the cylinder pressure sensor is inserted into the cylinder through the indicator valve of the diesel engine. The cylinder pressure sensor is used to collect the raw combustion pressure signal in the cylinder at a preset frequency. Figure 2(b) shows a schematic diagram of the cylinder pressure signal collected by the cylinder pressure sensor.
[0049] In step S102, the original cylinder head vibration signal of the diesel engine is converted into a cylinder head vibration angular domain signal, and the original in-cylinder combustion pressure signal is converted into an in-cylinder combustion pressure angular domain signal.
[0050] In one embodiment, converting the original cylinder head vibration signal of the diesel engine into a cylinder head vibration angular domain signal and simultaneously converting the original in-cylinder combustion pressure signal into an in-cylinder combustion pressure angular domain signal includes: dividing the periodic working process of the diesel engine using the top dead center position of the piston to convert the original cylinder head vibration signal into the cylinder head vibration angular domain signal, and converting the original in-cylinder combustion pressure signal into the in-cylinder combustion pressure angular domain signal.
[0051] Figure 2(c) shows a schematic diagram of the top dead center (TDC) signal. The TDC signal is a periodic pulse signal. Therefore, the periodicity of the TDC signal can be used to segment the original cylinder head vibration signal and the original in-cylinder combustion pressure signal, thereby converting the original cylinder head vibration signal and the original in-cylinder combustion pressure signal into the cylinder head vibration angular domain signal and the in-cylinder combustion pressure angular domain signal, respectively.
[0052] Specifically, when acquiring the original cylinder head vibration signal, the original in-cylinder combustion pressure signal, and the top dead center position, to synchronize the time of the three, they are acquired at the same preset frequency, for example, a preset frequency greater than 12.8 k / s. As shown in Figure 2(d), this is a schematic diagram of dividing the periodic working process of the diesel engine using the top dead center position of the piston. Since the top dead center signal is a periodic pulse signal, after synchronizing the three at a high frequency, the original cylinder head vibration signal and the original in-cylinder combustion pressure signal can be converted into periodic cylinder head vibration angular domain signals and in-cylinder combustion pressure angular domain signals.
[0053] In one embodiment, the periodic operation process of the diesel engine is divided using the top dead center position of the piston, including: A1, determining whether the top dead center position is the compression top dead center based on the characteristics of the original cylinder head vibration signal and the original in-cylinder combustion pressure signal of the diesel engine; A2, if it is the compression top dead center, converting the original cylinder head vibration signal into the cylinder head vibration angular domain signal and the original in-cylinder combustion pressure signal into the in-cylinder combustion pressure angular domain signal based on the position of the compression top dead center.
[0054] Due to the operating characteristics of a four-stroke diesel engine, two top dead center (TDC) signals are generated during each working cycle: a compression TDC signal and a combustion TDC signal. In this embodiment of the invention, the distance between the TDC trigger position and the maximum value of the cylinder pressure signal curve can be used to distinguish between the compression TDC and the combustion TDC. The distance between the compression TDC position and the maximum value of the cylinder pressure signal curve is relatively large, while the distance between the combustion TDC position and the maximum value of the cylinder pressure signal curve is very small. In this embodiment of the invention, the original cylinder head vibration signal and the original in-cylinder combustion pressure signal can be segmented along the compression TDC position to obtain the cylinder head vibration angular domain signal and the in-cylinder combustion pressure angular domain signal.
[0055] In one example, the diesel engine is equipped with a top dead center (TDC) sensor located relative to a magnet on the flywheel of the diesel engine. The TDC sensor is used to acquire a TDC signal at a preset frequency. In this embodiment of the invention, the TDC sensor is a magnetoelectric sensor. Specifically, a magnet is installed on the flywheel of the diesel engine, and the TDC sensor is installed directly opposite the magnet to acquire the TDC signal. Each rotation of the diesel engine flywheel triggers a pulse signal from the TDC sensor.
[0056] In step S103, the vibration characteristic parameters of the cylinder head vibration angle domain signal within a single working cycle are extracted, and the cylinder pressure characteristic parameters of the in-cylinder combustion pressure angle domain signal within the single working cycle are also extracted.
[0057] Figure 2(e) shows a schematic diagram of the vibration characteristic parameters of the cylinder head vibration angular domain signal and the cylinder pressure characteristic parameters of the in-cylinder combustion pressure angular domain signal extracted within a single working cycle.
[0058] In one example, the vibration characteristic parameters include at least one of the following: exhaust valve closing impact vibration intensity, intake valve closing impact vibration intensity, combustion impact vibration intensity, combustion impact duration, and exhaust valve opening section vibration intensity. Figure 3(a) shows a schematic diagram of the extraction of vibration characteristic parameters. The extraction method of each vibration characteristic parameter is illustrated below using a four-stroke diesel engine as an example.
[0059] Exhaust valve closing impact vibration intensity: Since the exhaust valve of a four-stroke diesel engine closes between -360° and -300° crankshaft angle, the maximum value of the vibration signal within this angle can be extracted to obtain the exhaust valve closing impact vibration intensity.
[0060] Intake valve closing impact vibration intensity: Since the intake valve of a four-stroke diesel engine closes between the crankshaft angle of -250° and -150°, the maximum value of the vibration signal between these angles is the intake valve closing impact vibration intensity. Therefore, the maximum value of the vibration signal when the intake valve is closed can be obtained.
[0061] Combustion impact vibration intensity: The combustion impact of a four-stroke diesel engine occurs between the crankshaft angle of -50° and 50°. The maximum value of the vibration signal between these angles is the combustion impact vibration intensity.
[0062] Combustion impact duration: The combustion impact of a four-stroke diesel engine occurs between -50° and 50° crankshaft angle. First, calculate the median vibration acceleration Vmedian of the entire vibration impact range between -360° and 360° crankshaft angle. Then, calculate the number of vibration acceleration values greater than Vmedian between -50° and 50° crankshaft angle. Count the number of values greater than Vmedian to obtain the total number N. N is the duration of the combustion impact.
[0063] Vibration intensity during the opening of the exhaust valve: The exhaust valve of a four-stroke diesel engine opens between 150° and 250° of crankshaft rotation. The maximum value of the vibration signal between these rotation angles is the vibration intensity during the opening of the exhaust valve.
[0064] In one example, the cylinder pressure characteristic parameters include at least one of the following: maximum pressure and valve opening segment curve shape. Figure 3(b) shows a schematic diagram of the extraction of cylinder pressure characteristic parameters. The extraction method of each cylinder pressure characteristic parameter is illustrated below using a four-stroke diesel engine as an example.
[0065] Maximum pressure: The combustion process of a four-stroke diesel engine occurs between -50° and 50° of crankshaft angle. The maximum value of the cylinder pressure signal within this angle is the maximum pressure.
[0066] Valve opening section curve shape: The valve opening of a four-stroke diesel engine occurs between 150° and 250° crankshaft angle. Calculate the smoothness of the cylinder pressure curve within this angle. A higher smoothness indicates a smoother curve shape, while a lower smoothness indicates more burrs in the curve. The smoothness calculation formula is as follows:
[0067]
[0068] Among them, V1, V2, ... V n This indicates the vibration signal value when the crankshaft rotation angle is between 150° and 250°.
[0069] In step S104, the vibration characteristic parameters and cylinder pressure characteristic parameters are compared with the fault diagnosis rule table to determine the fault type of the diesel engine.
[0070] This invention provides a fault diagnosis rule table based on the diesel engine's structure and working mechanism. The vibration characteristic parameters and cylinder pressure characteristic parameters extracted in step S103 are then compared with the rule table to determine the diesel engine's fault type. Common fault types include at least one of the following: excessive fuel injection, insufficient fuel injection, abnormal fuel injection angle, abnormal exhaust valve opening, abnormal exhaust valve closing, abnormal intake valve closing, and poor piston ring sealing. The rule table is shown in Table 1.
[0071] Table 1:
[0072]
[0073] In one embodiment, as shown in Figure 4(b), it is a schematic diagram of the cylinder head vibration angle domain signal and the in-cylinder combustion pressure angle domain signal of a diesel engine under normal conditions. As shown in Figure 4(a), it is a schematic diagram of the cylinder head vibration angle domain signal and the in-cylinder combustion pressure angle domain signal when the diesel engine malfunctions. It can be seen from the figure that the maximum pressure of the diesel engine is too high and the intensity of combustion impact vibration is too high. By comparing with the rule table, it can be determined that the fault type of the diesel engine is excessive fuel injection.
[0074] The following is combined Figure 5 The diesel engine fault diagnosis device of this application is described, wherein, Figure 5 A schematic block diagram of a diesel engine fault diagnosis device according to an embodiment of this application is shown.
[0075] like Figure 5 As shown, the diesel engine fault diagnosis device 500 includes: one or more memories 501 and one or more processors 502. The memories 501 store a computer program that is executed by the processors 502. When the computer program is executed by the processors 502, the processors 502 perform the diesel engine fault diagnosis method described above.
[0076] The diesel engine fault diagnosis device 500 may be part or all of a computer device that can implement diesel engine fault diagnosis methods through software, hardware, or a combination of software and hardware.
[0077] like Figure 5 As shown, the diesel engine fault diagnosis device 500 includes one or more memories 501, one or more processors 502, a display (not shown), and a communication interface, etc., which are interconnected via a bus system and / or other forms of connection mechanisms (not shown). It should be noted that... Figure 5The components and structure of the diesel engine fault diagnosis device 500 shown are merely exemplary and not limiting. The diesel engine fault diagnosis device 500 may also have other components and structures as needed.
[0078] Memory 501 is used to store various data and executable program instructions generated during train operation, such as algorithms for storing various applications or implementing various specific functions. It may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc.
[0079] The processor 502 may be a central processing unit (CPU), a graphics processing unit (GPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other processing units with data processing capabilities and / or instruction execution capabilities, and may incorporate other components in 500 to perform the desired functions.
[0080] In one example, the diesel engine fault diagnosis device 500 also includes an output device that can output various information (such as images or sounds) to the outside (e.g., a user), and may include one or more of a display device, a speaker, etc.
[0081] The communication interface can be any known communication protocol interface, such as a wired interface or a wireless interface. The communication interface may include one or more serial ports, USB interfaces, Ethernet ports, WiFi, wired networks, DVI interfaces, device integrated interconnect modules, or other suitable ports, interfaces, or connections.
[0082] Furthermore, according to an embodiment of this application, a diesel engine is also provided, the diesel engine including the diesel engine fault diagnosis device as described above;
[0083] The diesel engine also includes a vibration acceleration sensor, a cylinder pressure sensor, and a top dead center sensor;
[0084] The vibration acceleration sensor is installed on the cylinder head of the diesel engine and is used to collect high-frequency cylinder head vibration raw signals at a preset frequency.
[0085] The cylinder pressure sensor is located at the indicator valve of the diesel engine, and the probe of the cylinder pressure sensor is inserted into the cylinder through the indicator valve. The cylinder pressure sensor is used to collect the raw signal of the combustion pressure in the cylinder at a preset frequency.
[0086] The top dead center sensor is located at the relative position of the magnet on the flywheel of the diesel engine, and the top dead center sensor is used to acquire the top dead center signal at a preset frequency; wherein, the top dead center sensor includes a magnetoelectric sensor.
[0087] Furthermore, according to embodiments of this application, a storage medium is also provided, on which program instructions are stored. When executed by a computer or processor, these program instructions are used to perform corresponding steps of the diesel engine fault diagnosis method of this application. The storage medium may, for example, include a memory card of a smartphone, a storage component of a tablet computer, a hard disk of a personal computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disc read-only memory (CD-ROM), a USB memory, or any combination of the above storage media.
[0088] Furthermore, according to embodiments of this application, a computer program is also provided for verifying rail transit information data when the computer program is run by a computer or processor.
[0089] The diesel engine fault diagnosis device, diesel engine, and storage medium of this application embodiment have the same advantages as the aforementioned diesel engine fault diagnosis method because they can implement the aforementioned diesel engine fault diagnosis method.
[0090] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.
[0091] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.
[0092] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed.
[0093] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.
[0094] Similarly, it should be understood that, in order to streamline this application and aid in understanding one or more of the various inventive aspects, features of this application may sometimes be grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of this application. However, this approach should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the corresponding claims, its inventive point lies in solving the corresponding technical problem with features fewer than all features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.
[0095] Those skilled in the art will understand that, apart from the mutual exclusion of features, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus so disclosed can be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.
[0096] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.
[0097] The various component embodiments of this application can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some modules according to the embodiments of this application. This application can also be implemented as an apparatus program (e.g., a computer program and computer program product) for performing part or all of the methods described herein. Such an implementation of this application can be stored on a computer-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.
[0098] It should be noted that the above embodiments are illustrative of this application and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.
[0099] The above description is merely a specific embodiment or illustration of the embodiments of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. The scope of protection of this application shall be determined by the scope of the claims.
Claims
1. A diesel engine failure diagnosis method characterized by comprising: The method includes: The original signals of cylinder head vibration and cylinder combustion pressure of a diesel engine are acquired, wherein the original signals of cylinder head vibration and cylinder combustion pressure are acquired synchronously. The periodic working process of the diesel engine is divided by using the top dead center position of the piston to convert the original cylinder head vibration signal of the diesel engine into a cylinder head vibration angular domain signal, and at the same time convert the original in-cylinder combustion pressure signal into an in-cylinder combustion pressure angular domain signal. Vibration characteristic parameters of the cylinder head vibration angular domain signal within a single working cycle are extracted, and cylinder pressure characteristic parameters of the in-cylinder combustion pressure angular domain signal within the same single working cycle are also extracted. The vibration characteristic parameters and cylinder pressure characteristic parameters are compared with the fault diagnosis rule table to determine the fault type of the diesel engine, wherein the fault diagnosis rule table includes the vibration characteristic parameter status and the cylinder pressure characteristic parameter status.
2. The method of claim 1, wherein, The periodic operation process of the diesel engine is divided using the top dead center position of the piston, including: The characteristics of the original cylinder head vibration signal and the original in-cylinder combustion pressure signal of the diesel engine are used to determine whether the top dead center position is the compression top dead center. If it is the compression top dead center, then the original cylinder head vibration signal is converted into the cylinder head vibration angular domain signal according to the position of the compression top dead center, and the original in-cylinder combustion pressure signal is converted into the in-cylinder combustion pressure angular domain signal.
3. The method of claim 1, wherein, in, A vibration acceleration sensor is installed on the cylinder head of the diesel engine. The vibration acceleration sensor is used to collect the original vibration signal of the cylinder head at a preset frequency.
4. The method of claim 1, wherein, in, The diesel engine is equipped with a cylinder pressure sensor. The probe of the cylinder pressure sensor is inserted into the cylinder through the indicator valve of the diesel engine. The cylinder pressure sensor is used to collect the raw signal of the combustion pressure in the cylinder at a preset frequency.
5. The method of claim 1, wherein, in, The diesel engine is equipped with a top dead center sensor, which is located at the relative position of the magnet on the flywheel of the diesel engine. The top dead center sensor is used to collect the top dead center signal at a preset frequency.
6. The method of claim 5, wherein, in, The top dead center sensor includes a magnetoelectric sensor.
7. The method of claim 1, wherein, The vibration characteristic parameters include at least one of the following: exhaust valve closing impact vibration intensity, intake valve closing impact vibration intensity, combustion impact vibration intensity, combustion impact duration, and exhaust valve opening section vibration intensity.
8. The method of claim 1, wherein, The cylinder pressure characteristic parameters include at least one of the following: maximum pressure and valve opening section curve shape.
9. A diesel engine failure diagnosing apparatus characterized by comprising: The device includes: A memory and a processor, wherein the memory stores a computer program that is executed by the processor, the computer program, when executed by the processor, causes the processor to perform the diesel engine fault diagnosis method as described in any one of claims 1 to 8.
10. A diesel engine characterized by comprising: The diesel engine includes the diesel engine fault diagnosis device as described in claim 9; The diesel engine also includes a vibration acceleration sensor, a cylinder pressure sensor, and a top dead center sensor; The vibration acceleration sensor is installed on the cylinder head of the diesel engine and is used to collect high-frequency cylinder head vibration raw signals at a preset frequency. The cylinder pressure sensor is located at the indicator valve of the diesel engine, and the probe of the cylinder pressure sensor is inserted into the cylinder through the indicator valve. The cylinder pressure sensor is used to collect the raw signal of the combustion pressure in the cylinder at a preset frequency. The top dead center sensor is located at the relative position of the magnet on the flywheel of the diesel engine, and the top dead center sensor is used to acquire the top dead center signal at a preset frequency; wherein, the top dead center sensor includes a magnetoelectric sensor.
11. A storage medium, characterized by The storage medium stores a computer program, which, when executed by a processor, causes the processor to perform the diesel engine fault diagnosis method as described in any one of claims 1 to 8.