Determination method and determination device for abnormal sound valve of engine and storage medium

Abstract

The invention provides a method and device for determining an abnormal sound valve of an engine and a storage medium. The engine comprises a plurality of air cylinders, each air cylinder comprises a set of inlet valves and a set of exhaust valves, and the method comprises the steps that vibration signals of a preset area in the operation process of the engine are obtained, and the preset area is located at cylinder covers of the air cylinders; processing the vibration signal to extract pulse characteristics of the vibration signal, the pulse characteristics including a pulse position of the vibration signal and a pulse amplitude of the vibration signal; the corresponding relation between the pulse signal and a valve is determined, the matching relation is obtained, and the valve is an intake valve or an exhaust valve; and determining the pulse signal with the pulse amplitude greater than the amplitude threshold as an abnormal signal, and determining the valve corresponding to the abnormal signal as an abnormal sound valve according to the matching relationship. The method solves the problem that the accuracy of determining the abnormal sound valve of the engine is low.

Description

Technical Field

[0001] The present application relates to the field of engines, and in particular, to a method for determining an abnormally noisy valve of an engine, a device for determining an abnormally noisy valve of an engine, a computer-readable storage medium, and an electronic device. Background Art

[0002] In the prior art, valve seating noise caused by abnormal valve clearance is the main component of abnormal noise in the valve train. Summary of the invention

[0003] The main purpose of the present application is to provide a method for determining an abnormally noisy valve of an engine, a device for determining an abnormally noisy valve of an engine, a computer-readable storage medium and an electronic device, so as to at least solve the problem of low accuracy in determining an abnormally noisy valve of an engine in the prior art.

[0004] According to one aspect of the present application, a method for determining an abnormally noisy valve of an engine is provided, wherein the engine comprises a plurality of cylinders, each of the cylinders comprises a group of intake valves and a group of exhaust valves, wherein the method comprises: obtaining a vibration signal of a predetermined area during operation of the engine, wherein the predetermined area is the cylinder head of the cylinder; processing the vibration signal to extract a pulse feature of the vibration signal, wherein the pulse feature comprises a pulse position of the vibration signal and a pulse amplitude of the vibration signal, wherein the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal; determining a correspondence between the pulse signal and the valve to obtain a matching relationship, wherein the valve in the matching relationship is the intake valve or the exhaust valve; obtaining an amplitude threshold value, determining that a pulse signal having a pulse amplitude greater than the amplitude threshold value is an abnormal signal, and determining that the valve corresponding to the abnormal signal is a valve with an abnormal noise according to the matching relationship.

[0005] Optionally, the vibration signal is processed to extract pulse characteristics of the vibration signal, including: processing the vibration signal using a continuous wavelet transform or a sparse characterization method to obtain the processed vibration signal; and determining the pulse position and the pulse amplitude based on the processed vibration signal.

[0006] Optionally, determining the correspondence between the pulse signal and the valve to obtain a matching relationship includes: determining multiple abnormal noise cylinders based on the size relationship of multiple pulse amplitudes, wherein the abnormal noise cylinder is the cylinder where an abnormal noise fault occurs; obtaining the valve timing phase and multiple first abnormal noise phases, and performing pulse matching processing on the valve timing phase and the pulse position to obtain a preliminary matching relationship, wherein the valve timing phase is a phase value corresponding to any one of the intake valve and the exhaust valve, the first abnormal noise phase is a phase value corresponding to the intake valve and the exhaust valve of the abnormal noise cylinder, and the preliminary matching relationship is used to characterize the correspondence between the pulse signal and the preliminary abnormal noise valve; obtaining the missing tooth phase, and determining the matching relationship based on the missing tooth phase and the second abnormal noise phase, wherein the missing tooth phase is a phase corresponding to a missing tooth in a signal gear of the engine, and the second abnormal noise phase is a phase value corresponding to the preliminary abnormal noise valve, and the pulse signal and the valve correspond one-to-one.

[0007] Optionally, multiple abnormal-noise cylinders are determined based on the size relationship of multiple pulse amplitudes, including: obtaining the number of sensors used to collect the vibration signals to obtain a first number, and obtaining the number of cylinders to obtain a second number, wherein there are multiple sensors; determining the size relationship between the first number and the second number; when the first number is greater than or equal to the second number, obtaining the sensor corresponding to the maximum value among the multiple pulse amplitudes, and determining the cylinder whose distance to the sensor is less than or equal to the first distance as the abnormal-noise cylinder; when the first number is less than the second number, obtaining the sensor corresponding to the maximum value among the multiple pulse amplitudes, and determining the cylinder whose distance to the sensor is less than or equal to the second distance as the abnormal-noise cylinder, wherein the second distance is greater than the first distance.

[0008] Optionally, pulse matching processing is performed on the valve timing phase and the pulse position to obtain a preliminary matching relationship, including: calculating the difference between any two of the first abnormal sound phases to obtain a first phase difference; calculating the difference between any two of the valve timing phases to obtain multiple second phase differences, wherein the valve is the intake valve or the exhaust valve; determining that the valve corresponding to the second phase difference that is the same as the first phase difference is the preliminary abnormal sound valve corresponding to the pulse signal.

[0009] Optionally, obtaining the missing tooth phase includes: obtaining an engine speed signal, the speed signal including at least multiple pulse signals; determining a pulse signal with the largest pulse width among the multiple pulse signals as the missing tooth signal; and determining a phase corresponding to a start time corresponding to the missing tooth signal as the missing tooth phase.

[0010] Optionally, the matching relationship is determined based on the missing tooth phase and the second abnormal sound phase, including: calculating the difference between the second abnormal sound phase and the missing tooth phase to obtain a third phase difference; determining that the valve corresponding to the valve timing phase having the same absolute value as the third phase difference is the valve corresponding to the pulse signal.

[0011] According to another aspect of the present application, a device for determining abnormal-noise valves of an engine is provided, wherein the engine comprises a plurality of cylinders, each of the cylinders comprises a group of intake valves and a group of exhaust valves, wherein the device comprises: an acquisition unit, for acquiring a vibration signal of a predetermined area during operation of the engine, wherein the predetermined area is the cylinder head of the cylinder; a first processing unit, for processing the vibration signal to extract a pulse feature of the vibration signal, wherein the pulse feature comprises a pulse position of the vibration signal and a pulse amplitude of the vibration signal, wherein the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal; a second processing unit, for determining a correspondence between the pulse signal and the valve to obtain a matching relationship, wherein the valve in the matching relationship is the intake valve or the exhaust valve; a determination unit, for obtaining an amplitude threshold value, determining that a pulse signal having a pulse amplitude greater than the amplitude threshold value is an abnormal signal, and determining that the valve corresponding to the abnormal signal is an abnormal-noise valve according to the matching relationship.

[0012] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described.

[0013] According to another aspect of the present application, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to execute any one of the methods described through the computer program.

[0014] The technical solution of the present application is applied to provide a method for determining abnormal valve noise of an engine. The engine includes multiple cylinders, each of which includes a group of intake valves and a group of exhaust valves. First, a vibration signal of a predetermined area during the operation of the engine is obtained, and the predetermined area is the cylinder head of the cylinder; then, the vibration signal is processed to extract the pulse characteristics of the vibration signal, and the pulse characteristics include the pulse position of the vibration signal and the pulse amplitude of the vibration signal. The pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal; then the corresponding relationship between the pulse signal and the valve is determined to obtain a matching relationship, wherein the valve is an intake valve or an exhaust valve; finally, a pulse signal with a pulse amplitude greater than an amplitude threshold is determined to be an abnormal signal, and the valve corresponding to the abnormal signal is determined to be an abnormal valve according to the matching relationship. By collecting the vibration signal of the cylinder head position during the operation of the engine, the pulse position and pulse amplitude are extracted to characterize the pulse characteristics of the vibration signal, and the corresponding relationship between the pulse signal and the valve can be determined by feature matching of the pulse characteristics. Then, by comparing the pulse amplitude with the amplitude threshold, automatic detection of abnormal valve noise of the engine can be achieved. Compared with the human ear judgment method, this method can improve the detection accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for executing a method for determining an abnormal valve noise of an engine provided in an embodiment of the present application is shown;

[0017] Figure 2 A schematic flow chart of a method for determining an abnormal valve noise of an engine provided in accordance with an embodiment of the present application is shown;

[0018] Figure 3 A schematic diagram showing a corresponding relationship between a sensor and a cylinder provided in an embodiment of the present application is shown;

[0019] Figure 4 A waveform diagram of a pulse signal collected by a sensor provided according to an embodiment of the present application is shown;

[0020] Figure 5 A schematic diagram showing a correspondence relationship between another sensor and a cylinder provided according to an embodiment of the present application;

[0021] Figure 6 shows a waveform diagram of a pulse signal collected by another sensor provided in an embodiment of the present application;

[0022] Figure 7 A schematic diagram showing a corresponding relationship between phase and valve closing provided in an embodiment of the present application;

[0023] Figure 8 A schematic diagram showing a corresponding relationship between a rotation speed signal and a phase provided according to an embodiment of the present application;

[0024] Fig. 9 A specific flow chart of a method for determining an abnormal-noise valve of an engine provided in accordance with an embodiment of the present application is shown;

[0025] Fig.10 A structural block diagram of a device for determining abnormal valve noise of an engine provided according to an embodiment of the present application is shown.

[0026] The above drawings include the following reference numerals:

[0027] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] As introduced in the background technology, the accuracy of determining the abnormal valve noise of an engine in the prior art is low. To solve the above problem, the embodiments of the present application provide a method for determining the abnormal valve noise of an engine, a device for determining the abnormal valve noise of an engine, a computer-readable storage medium and an electronic device.

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 1 is a hardware structure block diagram of a mobile terminal of a method for determining an abnormal valve noise of an engine according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0034] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for determining the abnormal sound valve of the engine in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0035] In this embodiment, a method for determining abnormal valve noise of an engine running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0036] Figure 2 1 is a flow chart of a method for determining an abnormal valve noise of an engine according to an embodiment of the present application. The engine includes a plurality of cylinders, each of which includes a group of intake valves and a group of exhaust valves. Figure 2 As shown, the method comprises the following steps:

[0037] Step S201, obtaining a vibration signal of a predetermined area during the operation of the engine, wherein the predetermined area is a cylinder head of the cylinder;

[0038] Specifically, the vibration signal is the most direct representation of the abnormal noise generated by the valve train. Using the vibration signal as the core input for determining whether the valve train has an abnormal noise fault can improve the reliability of determining the abnormal noise fault.

[0039] Step S202, processing the vibration signal to extract the pulse feature of the vibration signal, wherein the pulse feature includes the pulse position of the vibration signal and the pulse amplitude of the vibration signal, the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal;

[0040] Specifically, the pulse position of the vibration signal and the pulse amplitude of the vibration signal are used as pulse features to reflect the signal characteristics of the abnormal sound of the valve mechanism.

[0041] Step S203, determining the corresponding relationship between the pulse signal and the valve to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve;

[0042] Specifically, each valve will stimulate a pulse signal, but different valves stimulate pulse signals to different degrees. Through relationship matching, it can be determined which exhaust valve or intake valve of which cylinder each pulse signal corresponds to.

[0043] Step S204, obtaining an amplitude threshold, determining that the pulse signal whose pulse amplitude is greater than the amplitude threshold is an abnormal signal, and determining that the valve corresponding to the abnormal signal is an abnormal-noise valve according to the matching relationship.

[0044] Specifically, according to the mechanical structure and operation mechanism of the engine, the types of abnormal noises of the valve train are mainly the following: 1) valve seating noise; 2) knocking noise between the rocker arm and the valve stem; 3) knocking noise between the rocker arm and the valve bridge; 4) friction noise between the cam and the tappet; 5) timing gear noise. When the engine lubrication and timing gear meshing are normal, the cam profile design and the stiffness and quality design of the components are normal, the valve seating noise caused by abnormal valve clearance occupies the main component in the abnormal noise of the valve train. In practical applications, simulation and experimental methods can be used to determine the amplitude threshold for abnormal noise determination. If the pulse amplitude exceeds the threshold, it is determined to be an abnormal noise, and the valve that excites the pulse is an abnormal noise valve, thereby realizing the abnormal noise determination and positioning at the same time. Compared with the prior art, the abnormal noise fault location can only locate the cylinder, that is, which cylinder has an abnormal noise fault, and the solution of the present application can specifically locate the valve, that is, which exhaust valve or intake valve has an abnormal noise fault.

[0045] Through this embodiment, a method for determining abnormal valve noise of an engine is provided. The engine includes multiple cylinders, each of which includes a group of intake valves and a group of exhaust valves. First, a vibration signal of a predetermined area during the operation of the engine is obtained, and the predetermined area is the cylinder head of the cylinder; then, the vibration signal is processed to extract the pulse characteristics of the vibration signal, and the pulse characteristics include the pulse position of the vibration signal and the pulse amplitude of the vibration signal. The pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal; then the corresponding relationship between the pulse signal and the valve is determined to obtain a matching relationship, wherein the valve is an intake valve or an exhaust valve; finally, a pulse signal with a pulse amplitude greater than an amplitude threshold is determined to be an abnormal signal, and the valve corresponding to the abnormal signal is determined to be an abnormal valve according to the matching relationship. By collecting the vibration signal of the cylinder head position during the operation of the engine, the pulse position and the pulse amplitude are extracted to characterize the pulse characteristics of the vibration signal. By matching the characteristics of the pulse characteristics, the corresponding relationship between the pulse signal and the valve can be determined. Then, by comparing the pulse amplitude with the amplitude threshold, automatic detection of abnormal valve noise of the engine can be achieved. Compared with the human ear judgment method, this method can improve the detection accuracy and efficiency.

[0046] In the specific implementation process, the above step S202 can be implemented by the following steps: step S2021, using continuous wavelet transform or sparse characterization method to process the above vibration signal to obtain the processed above vibration signal; step S2022, determining the above pulse position and the above pulse amplitude according to the processed above vibration signal. This method can further improve the accuracy of the extracted pulse features.

[0047] Specifically, the steps of processing vibration signals using continuous wavelet transform or sparse representation method include the following stages: First, the original vibration signal is preprocessed as necessary, such as denoising, filtering, etc., to improve the effect of subsequent processing. Select appropriate wavelet basis functions and scale parameters, apply continuous wavelet transform, convert the time domain signal to the time-frequency domain, and obtain the time-frequency representation of the signal. Use matching pursuit algorithm or other sparse decomposition methods to decompose the signal into a series of atoms (or basis functions) with different characteristics. Each atom contains certain characteristic information of the signal, such as scale, displacement, frequency and phase. Extract useful features from the transformed signal, such as the amplitude and frequency of the wavelet coefficients. For sparse representation, five-dimensional features such as sparse coefficients, scale, displacement, frequency and phase can be extracted.

[0048] In order to further obtain an accurate matching relationship, the above-mentioned step S203 of the present application can be implemented by the following steps: Step S2031, determining multiple abnormal noise cylinders according to the size relationship of the multiple pulse amplitudes, wherein the above-mentioned abnormal noise cylinders are the above-mentioned cylinders with abnormal noise failures; Step S2032, obtaining the valve timing phase and multiple first abnormal noise phases, and performing pulse matching processing on the above-mentioned valve timing phase and the above-mentioned pulse position to obtain a preliminary matching relationship, wherein the above-mentioned valve timing phase is the phase value corresponding to any one of the above-mentioned intake valve and the above-mentioned exhaust valve, the above-mentioned first abnormal noise phase is the phase value corresponding to the intake valve and the exhaust valve of the above-mentioned abnormal noise cylinder, and the above-mentioned preliminary matching relationship is used to characterize the correspondence between the above-mentioned pulse signal and the preliminary abnormal noise valve; Step S2033, obtaining the missing tooth phase, and determining the above-mentioned matching relationship according to the above-mentioned missing tooth phase and the second abnormal noise phase, wherein the above-mentioned missing tooth phase is the phase corresponding to the missing tooth in the signal gear of the engine, the above-mentioned second abnormal noise phase is the phase value corresponding to the above-mentioned preliminary abnormal noise valve, and the above-mentioned pulse signal and the above-mentioned valve have a one-to-one correspondence.

[0049] Specifically, the above method achieves pulse matching by inferring the valve corresponding to the excitation pulse in three steps. The first inference: based on the size relationship of the multiple pulse amplitudes mentioned above, multiple abnormal noise cylinders are determined. The second inference: matching is performed based on the engine's valve timing information to match the possible corresponding prepared abnormal noise valves. The third inference: further determination is made on the feasible solution of the abnormal noise valve in combination with the missing tooth phase.

[0050] The above step S2031 can also be implemented in other ways, for example: step S20311, obtain the number of sensors used to collect the above vibration signals to obtain a first number, and obtain the number of the above cylinders to obtain a second number, wherein there are multiple sensors; step S20312, determine the size relationship between the above first number and the above second number; step S20313, when the above first number is greater than or equal to the above second number, obtain the sensor corresponding to the maximum value of the multiple pulse amplitudes, and determine that the cylinder whose distance to the above sensor is less than or equal to the first distance is the above abnormal noise cylinder; step S20314, when the above first number is less than the above second number, obtain the sensor corresponding to the maximum value of the multiple pulse amplitudes, and determine that the cylinder whose distance to the above sensor is less than or equal to the second distance is the above abnormal noise cylinder, wherein the above second distance is greater than the above first distance. This method can further quickly and preliminarily determine the pulse source by comparing the amplitudes of the same pulse signal sensed by different sensors.

[0051] Specifically, take the case where the number of sensors is the same as the number of cylinders, such as Figure 3As shown in FIG. 1 , sensor Ⅰ, sensor Ⅱ, sensor Ⅲ, sensor Ⅳ, sensor Ⅴ and sensor Ⅵ are set one by one corresponding to cylinder 1, cylinder 2, cylinder 3, cylinder 4, cylinder 5 and cylinder 6. The pulse characteristics extracted from the signals collected by the first three sensors, namely sensor Ⅰ, sensor Ⅱ and sensor Ⅲ, are shown in FIG. Figure 4 As shown, the numbers on the horizontal axis are 5 1 and 2 2 For example, 5 1 Used to indicate the exhaust port of cylinder 5, 2 2 It is used to represent the air intake of cylinder 2, and the vertical axis represents the pulse amplitude. The pulse amplitude detected by sensor II is larger than the pulse amplitude at the adjacent cylinder head. Therefore, it can be determined that the excitation source of the pulse is the valve of cylinder 2, that is, cylinder 2 is the cylinder with the abnormal noise mentioned above. For example, the number of sensors is less than the number of cylinders. Figure 5 As shown, sensor II is set corresponding to cylinder 1, cylinder 2, cylinder 3 and cylinder 4, and sensor V is set corresponding to cylinder 5 and cylinder 6. The pulse features extracted from the signals collected by sensor II and sensor V are shown in Figure 6 As shown. The pulse amplitude detected by sensor II is larger than the pulse amplitude detected by sensor V. Therefore, it can be determined that the excitation source of the pulse is the valve of cylinder 1, cylinder 2, cylinder 3 and cylinder 4, that is, cylinder 1, cylinder 2, cylinder 3 and cylinder 4 are the above-mentioned abnormal sound cylinders. In another embodiment, the same is true Figure 5 The pulse characteristics extracted from the signals collected by the sensors II and V are shown in Table 1. The pulse amplitude collected by sensor V is larger than that collected by sensor II. Therefore, it can be judged that the excitation sources of these two pulses may be cylinder 3, cylinder 4, cylinder 5 and cylinder 6, and there are many different combinations. In addition, Figure 5 and Figure 3 Compared with the traditional 3D laser scanning technology, the number of sensors used is less, Figure 3 In the case of 6 sensors, Figure 5 In this case, only two sensors need to be set up, which can further reduce the cost.

[0052] Table 1

[0053]

[0054] In some embodiments, the above step S2032 can be specifically implemented by the following steps: step S20321, calculating the difference between any two of the above first abnormal sound phases to obtain a first phase difference; step S20322, calculating the difference between any two of the above valve timing phases to obtain multiple second phase differences, wherein the above valve is the above intake valve or exhaust valve; step S20323, determining that the above valve corresponding to the above second phase difference that is the same as the above first phase difference is the above prepared abnormal sound valve corresponding to the above pulse signal. This method can further quickly determine the correspondence between the above pulse signal and the prepared abnormal sound valve.

[0055] Specifically, the corresponding relationship between phase and valve closing is as follows: Figure 7 As shown, among the numbers on the horizontal axis, C 1 Used to represent cylinder 1, the vertical axis represents the exhaust valve or intake valve, and the horizontal axis is C 1 The vertical axis is an example of the exhaust valve, indicating that the exhaust valve of cylinder 1 is closed at the corresponding phase. As shown in Table 1, the first phase difference is 33.6 (693.5-659.9). By comparing the first phase difference and the second phase difference, it can be determined that the above-mentioned preparatory response valve is Figure 7 The three groups of valves within the dotted lines, i.e., the inference results of step 2, are: the intake valve of cylinder 6 - the exhaust valve of cylinder 4, the intake valve of cylinder 4 - the exhaust valve of cylinder 5, and the intake valve of cylinder 5 - the exhaust valve of cylinder 6.

[0056] Step S2033 can be implemented by the following steps: Step S20331, obtaining the engine speed signal, the speed signal at least includes a plurality of pulse signals; Step S20332, determining the pulse signal with the largest pulse width among the plurality of pulse signals as the missing tooth signal; Step S20333, determining the phase corresponding to the start time corresponding to the missing tooth signal as the missing tooth phase. This method can further quickly determine the missing tooth phase.

[0057] In practical applications, a Hall effect sensor can be used to obtain the above speed signal. The Hall effect sensor detects the position of the tooth groove of the timing gear and uses the voltage signal generated by the Hall effect to collect the speed signal. The timing gear has a missing tooth, also called a notch, and when the missing tooth passes the sensor, it is usually used to mark the top dead center of the engine.

[0058] The above step S2033 can also be implemented by the following steps: step S20334, calculating the difference between the second abnormal sound phase and the missing tooth phase to obtain a third phase difference; step S20335, determining that the valve corresponding to the valve timing phase having the same absolute value as the third phase difference is the valve corresponding to the pulse signal. This method can further quickly achieve the matching of the corresponding relationship between the pulse signal and the valve.

[0059] Specifically, Figure 7 and Figure 8 As shown, when the missing tooth passes the sensor, the exhaust valve of cylinder 1 or cylinder 6 is closed, corresponding to Figure 7 and Figure 8 In this case, the waveform graph will have the following characteristics, such as Figure 8 As shown, first, at the missing tooth position, the Hall effect sensor will not detect the gear teeth, so a low-level gap longer than the normal pulse width will appear in the waveform. The gap caused by the missing tooth corresponds to the top dead center of the engine. Secondly, the position of the missing tooth is fixed, so this long gap will appear periodically in the waveform in each engine cycle. This feature can be used to accurately locate the top dead center of the engine. Except for the long gap caused by the missing tooth, the rest of the waveform is still a normal square wave signal. This means that before and after the missing tooth, the output signal of the sensor still maintains a pulse width corresponding to the tooth groove of the timing gear. Two rotations of the timing gear are a complete cycle of the four-stroke. As shown Figure 8 As shown, the positions of the exhaust stroke or compression stroke top dead center at the phases 0° and 360° (circled positions) correspond to the positions where the exhaust valves of cylinders 1 or 6 are closed. Taking the missing tooth phase of 570.3° as an example, and the phase of 659.9° in Table 1 as an example, the third phase difference is 89.6°, that is, the feasible solution is 89.6° (0°+89.6°) and the valve corresponding to 449.6° (360°+89.6°), as shown in Figure 7 As shown, it corresponds to the closing of the intake valve of cylinder 3 and the closing of the intake valve of cylinder 4. Combined with the determination results of the above-mentioned preparatory response valves, it can be determined that the valves corresponding to the phases 659.9° and 693.5° in Table 1 are the intake valve of cylinder 4 and the exhaust valve of cylinder 5, respectively.

[0060] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the method for determining the abnormal noise valve of the engine of the present application will be described in detail below in combination with specific embodiments.

[0061] This embodiment relates to a specific method for determining an abnormal valve noise of an engine, such as Fig. 9 As shown, the following steps are included:

[0062] Step S1: obtaining a vibration signal at a cylinder head position during engine operation;

[0063] Step S2: extracting pulses from the vibration signal to obtain pulse time coordinates and pulse amplitudes;

[0064] Step S3: Determine whether an abnormal sound fault occurs based on the relationship between the pulse amplitude and the set threshold;

[0065] Step S4: in the event of an abnormal noise fault, pulse matching is performed according to the pulse time coordinate and the valve timing phase to obtain a matching relationship to determine the corresponding relationship between the pulse signal and the valve;

[0066] Step S5: positioning the abnormal-noise valve according to the matching relationship.

[0067] The embodiment of the present application also provides a device for determining the abnormal noise valve of an engine. It should be noted that the device for determining the abnormal noise valve of an engine in the embodiment of the present application can be used to execute the method for determining the abnormal noise valve of an engine provided in the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation in hardware, or a combination of software and hardware, is also possible and conceivable.

[0068] The following is an introduction to the device for determining abnormal-noise valves of an engine provided in an embodiment of the present application.

[0069] Fig.10 Schematic diagram of a device for determining abnormal valve noise of an engine according to an embodiment of the present application. The engine includes a plurality of cylinders, each of which includes a group of intake valves and a group of exhaust valves. Fig.10 As shown, the device comprises:

[0070] An acquisition unit 10 is used to acquire a vibration signal of a predetermined area during the operation of the engine, wherein the predetermined area is a cylinder head of the cylinder;

[0071] Specifically, the vibration signal is the most direct representation of the abnormal noise generated by the valve train. Using the vibration signal as the core input for determining whether the valve train has an abnormal noise fault can improve the reliability of determining the abnormal noise fault.

[0072] A first processing unit 20 is used to process the vibration signal to extract a pulse feature of the vibration signal, wherein the pulse feature includes a pulse position of the vibration signal and a pulse amplitude of the vibration signal, the pulse position is used to characterize a position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize an amplitude of the pulse signal;

[0073] Specifically, the pulse position of the vibration signal and the pulse amplitude of the vibration signal are used as pulse features to reflect the signal characteristics of the abnormal sound of the valve mechanism.

[0074] The second processing unit 30 is used to determine the corresponding relationship between the pulse signal and the valve to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve;

[0075] Specifically, each valve will stimulate a pulse signal, but different valves stimulate pulse signals to different degrees. Through relationship matching, it can be determined which exhaust valve or intake valve of which cylinder each pulse signal corresponds to.

[0076] The determination unit 40 is used to obtain an amplitude threshold, determine that the pulse signal with the pulse amplitude greater than the amplitude threshold is an abnormal signal, and determine that the valve corresponding to the abnormal signal is an abnormal-noise valve according to the matching relationship.

[0077] Specifically, according to the mechanical structure and operation mechanism of the engine, the types of abnormal noises of the valve train are mainly the following: 1) valve seating noise; 2) knocking noise between the rocker arm and the valve stem; 3) knocking noise between the rocker arm and the valve bridge; 4) friction noise between the cam and the tappet; 5) timing gear noise. When the engine lubrication and timing gear meshing are normal, the cam profile design and the stiffness and quality design of the components are normal, the valve seating noise caused by abnormal valve clearance occupies the main component in the abnormal noise of the valve train. In practical applications, simulation and experimental methods can be used to determine the amplitude threshold for abnormal noise determination. If the pulse amplitude exceeds the threshold, it is determined to be an abnormal noise, and the valve that excites the pulse is an abnormal noise valve, thereby realizing the abnormal noise determination and positioning at the same time. Compared with the prior art, the abnormal noise fault location can only locate the cylinder, that is, which cylinder has an abnormal noise fault, and the solution of the present application can specifically locate the valve, that is, which exhaust valve or intake valve has an abnormal noise fault.

[0078] Through this embodiment, a device for determining abnormal valve noise of an engine is provided, the engine includes a plurality of cylinders, each of the above cylinders includes a group of intake valves and a group of exhaust valves, the acquisition unit acquires the vibration signal of a predetermined area during the operation of the engine, and the predetermined area is the cylinder head of the cylinder; the first processing unit processes the vibration signal to extract the pulse feature of the vibration signal, the pulse feature includes the pulse position of the vibration signal and the pulse amplitude of the vibration signal, the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal; the second processing unit determines the correspondence between the pulse signal and the valve to obtain a matching relationship, wherein the valve is an intake valve or an exhaust valve; the determination unit determines that the pulse signal with a pulse amplitude greater than the amplitude threshold is an abnormal signal, and determines that the valve corresponding to the abnormal signal is an abnormal valve according to the matching relationship. By collecting the vibration signal of the cylinder head position during the operation of the engine, the pulse position and the pulse amplitude are extracted to characterize the pulse feature of the vibration signal, and the corresponding relationship between the pulse signal and the valve can be determined by feature matching of the pulse feature. Then, by comparing the pulse amplitude with the amplitude threshold, automatic detection of abnormal valve noise of the engine can be achieved. Compared with the human ear judgment method, this method can improve the detection accuracy and efficiency.

[0079] In a specific implementation process, the first processing unit includes a first processing module and a first determining module, wherein the first processing module is used to process the vibration signal using a continuous wavelet transform or a sparse representation method to obtain the processed vibration signal; the first determining module is used to determine the pulse position and the pulse amplitude according to the processed vibration signal. The device can further improve the accuracy of the extracted pulse features.

[0080] Specifically, the steps of processing vibration signals using continuous wavelet transform or sparse representation method include the following stages: First, the original vibration signal is preprocessed as necessary, such as denoising, filtering, etc., to improve the effect of subsequent processing. Select appropriate wavelet basis functions and scale parameters, apply continuous wavelet transform, convert the time domain signal to the time-frequency domain, and obtain the time-frequency representation of the signal. Use matching pursuit algorithm or other sparse decomposition methods to decompose the signal into a series of atoms (or basis functions) with different characteristics. Each atom contains certain characteristic information of the signal, such as scale, displacement, frequency and phase. Extract useful features from the transformed signal, such as the amplitude and frequency of the wavelet coefficients. For sparse representation, five-dimensional features such as sparse coefficients, scale, displacement, frequency and phase can be extracted.

[0081] In order to further obtain an accurate matching relationship, the above-mentioned second processing unit of the present application includes a second determination module, a second processing module and a third determination module, wherein the second determination module is used to determine multiple abnormal noise cylinders according to the size relationship of the multiple pulse amplitudes, wherein the above-mentioned abnormal noise cylinders are the above-mentioned cylinders with abnormal noise failures; the second processing module is used to obtain the valve timing phase and multiple first abnormal noise phases, and perform pulse matching processing on the above-mentioned valve timing phase and the above-mentioned pulse position to obtain a preliminary matching relationship, wherein the above-mentioned valve timing phase is a phase value corresponding to any one of the above-mentioned intake valves and the above-mentioned exhaust valves, the above-mentioned first abnormal noise phase is a phase value corresponding to the intake valve and the exhaust valve of the above-mentioned abnormal noise cylinder, and the above-mentioned preliminary matching relationship is used to characterize the correspondence between the above-mentioned pulse signal and the preliminary abnormal noise valve; the third determination module is used to obtain the missing tooth phase, and determine the above-mentioned matching relationship according to the above-mentioned missing tooth phase and the second abnormal noise phase, wherein the above-mentioned missing tooth phase is a phase corresponding to the missing tooth in the signal gear of the engine, the above-mentioned second abnormal noise phase is a phase value corresponding to the above-mentioned preliminary abnormal noise valve, and the above-mentioned pulse signal and the above-mentioned valve correspond one-to-one.

[0082] Specifically, the above method achieves pulse matching by inferring the valve corresponding to the excitation pulse in three steps. The first inference: based on the size relationship of the multiple pulse amplitudes mentioned above, multiple abnormal noise cylinders are determined. The second inference: matching is performed based on the engine's valve timing information to match the possible corresponding prepared abnormal noise valves. The third inference: further determination is made on the feasible solution of the abnormal noise valve in combination with the missing tooth phase.

[0083] The second determination module includes a first acquisition submodule, a first determination submodule, a second acquisition submodule and a second determination submodule, wherein the first acquisition submodule is used to acquire the number of sensors used to collect the vibration signal to obtain the first number, and acquire the number of the cylinders to obtain the second number, wherein there are multiple sensors; the first determination submodule is used to determine the size relationship between the first number and the second number; the second acquisition submodule is used to acquire the sensor corresponding to the maximum value of the multiple pulse amplitudes when the first number is greater than or equal to the second number, and determine that the cylinder whose distance to the sensor is less than or equal to the first distance is the abnormal sound cylinder; the second determination submodule is used to acquire the sensor corresponding to the maximum value of the multiple pulse amplitudes when the first number is less than the second number, and determine that the cylinder whose distance to the sensor is less than or equal to the second distance is the abnormal sound cylinder, wherein the second distance is greater than the first distance. The device can further quickly and preliminarily determine the pulse source by comparing the amplitudes of the same pulse signal sensed by different sensors.

[0084] Specifically, take the case where the number of sensors is the same as the number of cylinders, such as Figure 3 As shown in FIG. 1 , sensor Ⅰ, sensor Ⅱ, sensor Ⅲ, sensor Ⅳ, sensor Ⅴ and sensor Ⅵ are set one by one corresponding to cylinder 1, cylinder 2, cylinder 3, cylinder 4, cylinder 5 and cylinder 6. The pulse characteristics extracted from the signals collected by the first three sensors, namely sensor Ⅰ, sensor Ⅱ and sensor Ⅲ, are shown in FIG. Figure 4 As shown, the numbers on the horizontal axis are 5 1 and 2 2 For example, 5 1 Used to indicate the exhaust port of cylinder 5, 2 2 It is used to represent the air intake of cylinder 2, and the vertical axis represents the pulse amplitude. The pulse amplitude detected by sensor II is larger than the pulse amplitude at the adjacent cylinder head. Therefore, it can be determined that the excitation source of the pulse is the valve of cylinder 2, that is, cylinder 2 is the cylinder with the abnormal noise mentioned above. For example, the number of sensors is less than the number of cylinders. Figure 5 As shown, sensor II is set corresponding to cylinder 1, cylinder 2, cylinder 3 and cylinder 4, and sensor V is set corresponding to cylinder 5 and cylinder 6. The pulse features extracted from the signals collected by sensor II and sensor V are shown in Figure 6 As shown. The pulse amplitude detected by sensor II is larger than the pulse amplitude detected by sensor V. Therefore, it can be determined that the excitation source of the pulse is the valve of cylinder 1, cylinder 2, cylinder 3 and cylinder 4, that is, cylinder 1, cylinder 2, cylinder 3 and cylinder 4 are the above-mentioned abnormal sound cylinders. In another embodiment, the same is true Figure 5The pulse characteristics extracted from the signals collected by the sensors II and V are shown in Table 1. The pulse amplitude collected by sensor V is larger than that collected by sensor II. Therefore, it can be judged that the excitation sources of these two pulses may be cylinder 3, cylinder 4, cylinder 5 and cylinder 6, and there are many different combinations. In addition, Figure 5 and Figure 3 Compared with the traditional 3D laser scanning technology, the number of sensors used is less, Figure 3 In the case of 6 sensors, Figure 5 In this case, only two sensors need to be set up, which can further reduce the cost.

[0085] In some embodiments, the second processing module includes a first calculation submodule, a second calculation submodule and a third determination submodule, wherein the first calculation submodule is used to calculate the difference between any two of the first abnormal sound phases to obtain a first phase difference; the second calculation submodule is used to calculate the difference between any two of the valve timing phases to obtain multiple second phase differences, wherein the valve is the intake valve or the exhaust valve; the third determination submodule is used to determine that the valve corresponding to the second phase difference that is the same as the first phase difference is the prepared abnormal sound valve corresponding to the pulse signal. The device can further quickly determine the correspondence between the pulse signal and the prepared abnormal sound valve.

[0086] Specifically, the corresponding relationship between phase and valve closing is as follows: Figure 7 As shown, among the numbers on the horizontal axis, C 1 Used to represent cylinder 1, the vertical axis represents the exhaust valve or intake valve, and the horizontal axis is C 1 The vertical axis is an example of the exhaust valve, indicating that the exhaust valve of cylinder 1 is closed at the corresponding phase. As shown in Table 1, the first phase difference is 33.6 (693.5-659.9). By comparing the first phase difference and the second phase difference, it can be determined that the above-mentioned preparatory response valve is Figure 7 The three groups of valves within the dotted lines, i.e., the inference results of step 2, are: the intake valve of cylinder 6 - the exhaust valve of cylinder 4, the intake valve of cylinder 4 - the exhaust valve of cylinder 5, and the intake valve of cylinder 5 - the exhaust valve of cylinder 6.

[0087] The third determination module includes a third acquisition submodule, a fourth determination submodule and a fifth determination submodule, wherein the third acquisition submodule is used to acquire the engine speed signal, the speed signal at least includes a plurality of pulse signals; the fourth acquisition submodule is used to determine that the pulse signal with the largest pulse width among the plurality of pulse signals is the missing tooth signal; the fifth determination submodule is used to determine that the phase corresponding to the start time corresponding to the missing tooth signal is the missing tooth phase. The device can further quickly determine the missing tooth phase.

[0088] In practical applications, a Hall effect sensor can be used to obtain the above speed signal. The Hall effect sensor detects the position of the tooth groove of the timing gear and uses the voltage signal generated by the Hall effect to collect the speed signal. The timing gear has a missing tooth, also called a notch, and when the missing tooth passes the sensor, it is usually used to mark the top dead center of the engine.

[0089] The third determination module further includes a third calculation submodule and a sixth determination submodule, wherein the third calculation submodule is used to calculate the difference between the second abnormal sound phase and the missing tooth phase to obtain a third phase difference; and the sixth determination submodule is used to determine that the valve corresponding to the valve timing phase having the same absolute value as the third phase difference is the valve corresponding to the pulse signal. The device can further quickly achieve the matching of the corresponding relationship between the pulse signal and the valve.

[0090] Specifically, Figure 7 and Figure 8 As shown, when the missing tooth passes the sensor, the exhaust valve of cylinder 1 or cylinder 6 is closed, corresponding to Figure 7 and Figure 8 In this case, the waveform graph will have the following characteristics, such as Figure 8 As shown, first, at the missing tooth position, the Hall effect sensor will not detect the gear teeth, so a low-level gap longer than the normal pulse width will appear in the waveform. The gap caused by the missing tooth corresponds to the top dead center of the engine. Secondly, the position of the missing tooth is fixed, so this long gap will appear periodically in the waveform in each engine cycle. This feature can be used to accurately locate the top dead center of the engine. Except for the long gap caused by the missing tooth, the rest of the waveform is still a normal square wave signal. This means that before and after the missing tooth, the output signal of the sensor still maintains a pulse width corresponding to the tooth groove of the timing gear. Two rotations of the timing gear are a complete cycle of the four-stroke. As shown Figure 8 As shown, the positions of the exhaust stroke or compression stroke top dead center at the phases 0° and 360° (circled positions) correspond to the positions where the exhaust valves of cylinders 1 or 6 are closed. Taking the missing tooth phase of 570.3° as an example, and the phase of 659.9° in Table 1 as an example, the third phase difference is 89.6°, that is, the feasible solution is 89.6° (0°+89.6°) and the valve corresponding to 449.6° (360°+89.6°), as shown in Figure 7 As shown, it corresponds to the closing of the intake valve of cylinder 3 and the closing of the intake valve of cylinder 4. Combined with the determination results of the above-mentioned preparatory response valves, it can be determined that the valves corresponding to the phases 659.9° and 693.5° in Table 1 are the intake valve of cylinder 4 and the exhaust valve of cylinder 5, respectively.

[0091] The above-mentioned determination device of abnormal valve noise of the engine includes a processor and a memory, and the above-mentioned acquisition unit, the first processing unit, the second processing unit and the determination unit are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize the corresponding functions. The above-mentioned modules are all located in the same processor; or, the above-mentioned modules are located in different processors in the form of any combination.

[0092] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the abnormal valve noise of the engine can be determined by adjusting the kernel parameters.

[0093] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0094] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the method for determining the abnormal-noise valve of the engine.

[0095] Specifically, the method for determining the abnormal valve noise of the engine includes:

[0096] Step S201, obtaining a vibration signal of a predetermined area during the operation of the engine, wherein the predetermined area is a cylinder head of the cylinder;

[0097] Specifically, the vibration signal is the most direct representation of the abnormal noise generated by the valve train. Using the vibration signal as the core input for determining whether the valve train has an abnormal noise fault can improve the reliability of determining the abnormal noise fault.

[0098] Step S202, processing the vibration signal to extract the pulse feature of the vibration signal, wherein the pulse feature includes the pulse position of the vibration signal and the pulse amplitude of the vibration signal, the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal;

[0099] Specifically, the pulse position of the vibration signal and the pulse amplitude of the vibration signal are used as pulse features to reflect the signal characteristics of the abnormal sound of the valve mechanism.

[0100] Step S203, determining the corresponding relationship between the pulse signal and the valve to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve;

[0101] Specifically, each valve will stimulate a pulse signal, but different valves stimulate pulse signals to different degrees. Through relationship matching, it can be determined which exhaust valve or intake valve of which cylinder each pulse signal corresponds to.

[0102] Step S204, obtaining an amplitude threshold, determining that the pulse signal whose pulse amplitude is greater than the amplitude threshold is an abnormal signal, and determining that the valve corresponding to the abnormal signal is an abnormal-noise valve according to the matching relationship.

[0103] Specifically, according to the mechanical structure and operation mechanism of the engine, the types of abnormal noises of the valve train are mainly the following: 1) valve seating noise; 2) knocking noise between the rocker arm and the valve stem; 3) knocking noise between the rocker arm and the valve bridge; 4) friction noise between the cam and the tappet; 5) timing gear noise. When the engine lubrication and timing gear meshing are normal, the cam profile design and the stiffness and quality design of the components are normal, the valve seating noise caused by abnormal valve clearance occupies the main component in the abnormal noise of the valve train. In practical applications, simulation and experimental methods can be used to determine the amplitude threshold for abnormal noise determination. If the pulse amplitude exceeds the threshold, it is determined to be an abnormal noise, and the valve that excites the pulse is an abnormal noise valve, thereby realizing the abnormal noise determination and positioning at the same time. Compared with the prior art, the abnormal noise fault location can only locate the cylinder, that is, which cylinder has an abnormal noise fault, and the solution of the present application can specifically locate the valve, that is, which exhaust valve or intake valve has an abnormal noise fault.

[0104] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the method for determining the abnormal-noise valve of the engine is executed when the program is run.

[0105] Specifically, the method for determining the abnormal valve noise of the engine includes:

[0106] Step S201, obtaining a vibration signal of a predetermined area during the operation of the engine, wherein the predetermined area is a cylinder head of the cylinder;

[0107] Specifically, the vibration signal is the most direct representation of the abnormal noise generated by the valve train. Using the vibration signal as the core input for determining whether the valve train has an abnormal noise fault can improve the reliability of determining the abnormal noise fault.

[0108] Step S202, processing the vibration signal to extract the pulse feature of the vibration signal, wherein the pulse feature includes the pulse position of the vibration signal and the pulse amplitude of the vibration signal, the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal;

[0109] Specifically, the pulse position of the vibration signal and the pulse amplitude of the vibration signal are used as pulse features to reflect the signal characteristics of the abnormal sound of the valve mechanism.

[0110] Step S203, determining the corresponding relationship between the pulse signal and the valve to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve;

[0111] Specifically, each valve will stimulate a pulse signal, but different valves stimulate pulse signals to different degrees. Through relationship matching, it can be determined which exhaust valve or intake valve of which cylinder each pulse signal corresponds to.

[0112] Step S204, obtaining an amplitude threshold, determining that the pulse signal whose pulse amplitude is greater than the amplitude threshold is an abnormal signal, and determining that the valve corresponding to the abnormal signal is an abnormal-noise valve according to the matching relationship.

[0113] Specifically, according to the mechanical structure and operation mechanism of the engine, the types of abnormal noises of the valve train are mainly the following: 1) valve seating noise; 2) knocking noise between the rocker arm and the valve stem; 3) knocking noise between the rocker arm and the valve bridge; 4) friction noise between the cam and the tappet; 5) timing gear noise. When the engine lubrication and timing gear meshing are normal, the cam profile design and the stiffness and quality design of the components are normal, the valve seating noise caused by abnormal valve clearance occupies the main component in the abnormal noise of the valve train. In practical applications, simulation and experimental methods can be used to determine the amplitude threshold for abnormal noise determination. If the pulse amplitude exceeds the threshold, it is determined to be an abnormal noise, and the valve that excites the pulse is an abnormal noise valve, thereby realizing the abnormal noise determination and positioning at the same time. Compared with the prior art, the abnormal noise fault location can only locate the cylinder, that is, which cylinder has an abnormal noise fault, and the solution of the present application can specifically locate the valve, that is, which exhaust valve or intake valve has an abnormal noise fault.

[0114] An embodiment of the present invention provides a device, the device including a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented:

[0115] Step S201, obtaining a vibration signal of a predetermined area during the operation of the engine, wherein the predetermined area is a cylinder head of the cylinder;

[0116] Step S202, processing the vibration signal to extract the pulse feature of the vibration signal, wherein the pulse feature includes the pulse position of the vibration signal and the pulse amplitude of the vibration signal, the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal;

[0117] Step S203, determining the corresponding relationship between the pulse signal and the valve to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve;

[0118] Step S204, obtaining an amplitude threshold, determining that the pulse signal whose pulse amplitude is greater than the amplitude threshold is an abnormal signal, and determining that the valve corresponding to the abnormal signal is an abnormal-noise valve according to the matching relationship.

[0119] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0120] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0121] Step S201, obtaining a vibration signal of a predetermined area during the operation of the engine, wherein the predetermined area is a cylinder head of the cylinder;

[0122] Step S202, processing the vibration signal to extract the pulse feature of the vibration signal, wherein the pulse feature includes the pulse position of the vibration signal and the pulse amplitude of the vibration signal, the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal;

[0123] Step S203, determining the corresponding relationship between the pulse signal and the valve to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve;

[0124] Step S204, obtain the amplitude threshold, determine that the pulse signal with the pulse amplitude greater than the amplitude threshold is an abnormal signal, and determine that the valve corresponding to the abnormal signal is an abnormal sound valve according to the matching relationship. Obviously, those skilled in the art should understand that the modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by executable program codes of computing devices, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than that here, or they can be made into individual integrated circuit modules respectively, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the present invention is not limited to any specific combination of hardware and software.

[0125] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0126] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0127] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0128] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0129] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0130] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0131] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0132] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0133] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0134] 1) The method for determining the abnormal sound valve of the engine of the present application, the engine includes multiple cylinders, each of the above cylinders includes a group of intake valves and a group of exhaust valves, first, obtain the vibration signal of the predetermined area during the operation of the engine, the predetermined area is the cylinder head of the cylinder; then, process the vibration signal to extract the pulse characteristics of the vibration signal, the pulse characteristics include the pulse position of the vibration signal and the pulse amplitude of the vibration signal, the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal; then determine the correspondence between the pulse signal and the valve to obtain a matching relationship, wherein the valve is an intake valve or an exhaust valve; finally, determine that the pulse signal with a pulse amplitude greater than the amplitude threshold is an abnormal signal, and determine the valve corresponding to the abnormal signal as the abnormal sound valve according to the matching relationship. By collecting the vibration signal of the cylinder head position during the operation of the engine, and then extracting the pulse position and pulse amplitude to characterize the pulse characteristics of the vibration signal, the corresponding relationship between the pulse signal and the valve can be determined by the feature matching of the pulse characteristics. Then, by comparing the pulse amplitude with the amplitude threshold, the automatic detection of the abnormal sound valve of the engine can be realized. Compared with the human ear judgment method, this method can improve the detection accuracy and efficiency.

[0135] 2) The device for determining abnormal-noise valves of the engine of the present application, the engine includes a plurality of cylinders, each of the above-mentioned cylinders includes a group of intake valves and a group of exhaust valves, the acquisition unit acquires the vibration signal of a predetermined area during the operation of the engine, and the predetermined area is the cylinder head of the cylinder; the first processing unit processes the vibration signal to extract the pulse characteristics of the vibration signal, the pulse characteristics include the pulse position of the vibration signal and the pulse amplitude of the vibration signal, the pulse position is used to characterize the position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize the amplitude of the pulse signal; the second processing unit determines the correspondence between the pulse signal and the valve to obtain a matching relationship, wherein the valve is an intake valve or an exhaust valve; the determination unit determines that the pulse signal with a pulse amplitude greater than the amplitude threshold is an abnormal signal, and determines that the valve corresponding to the abnormal signal is an abnormal-noise valve according to the matching relationship. By collecting the vibration signal of the cylinder head position during the operation of the engine, and then extracting the pulse position and pulse amplitude to characterize the pulse characteristics of the vibration signal, the correspondence between the pulse signal and the valve can be determined through the feature matching of the pulse characteristics. By comparing the pulse amplitude with the amplitude threshold, the engine abnormal valve noise automatic detection can be realized. Compared with the human ear judgment method, this method can improve the detection accuracy and efficiency.

[0136] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining abnormal valve noise of an engine, characterized in that: The engine comprises a plurality of cylinders, each of the cylinders comprises a set of intake valves and a set of exhaust valves, wherein the method comprises: Acquiring a vibration signal of a predetermined area during operation of the engine, wherein the predetermined area is a cylinder head of the cylinder; Processing the vibration signal to extract a pulse feature of the vibration signal, wherein the pulse feature includes a pulse position of the vibration signal and a pulse amplitude of the vibration signal, the pulse position is used to characterize a position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize an amplitude of the pulse signal; Determine a corresponding relationship between the pulse signal and a valve to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve; An amplitude threshold is obtained, and a pulse signal whose pulse amplitude is greater than the amplitude threshold is determined to be an abnormal signal, and the valve corresponding to the abnormal signal is determined to be an abnormal-noise valve according to the matching relationship.

2. The method according to claim 1, characterized in that Processing the vibration signal to extract the pulse feature of the vibration signal includes: Processing the vibration signal by using continuous wavelet transform or sparse representation method to obtain the processed vibration signal; The pulse position and the pulse amplitude are determined according to the processed vibration signal.

3. The method according to claim 1, characterized in that Determining the corresponding relationship between the pulse signal and the valve to obtain a matching relationship includes: Determine a plurality of abnormal-noise cylinders according to the magnitude relationship of the plurality of pulse amplitudes, wherein the abnormal-noise cylinders are the cylinders where abnormal-noise faults occur; Acquire a valve timing phase and a plurality of first abnormal noise phases, and perform pulse matching processing on the valve timing phase and the pulse position to obtain a preliminary matching relationship, wherein the valve timing phase is a phase value corresponding to any one of the intake valve and the exhaust valve, the first abnormal noise phase is a phase value corresponding to the intake valve and the exhaust valve of the abnormal noise cylinder, and the preliminary matching relationship is used to characterize the corresponding relationship between the pulse signal and the preliminary abnormal noise valve; Obtain the missing tooth phase, and determine the matching relationship based on the missing tooth phase and the second abnormal noise phase, wherein the missing tooth phase is the phase corresponding to the missing tooth in the signal gear of the engine, and the second abnormal noise phase is the phase value corresponding to the preparatory abnormal noise valve, and the pulse signal and the valve correspond one to one.

4. The method according to claim 3, characterized in that Determining multiple cylinders with abnormal noises according to the magnitude relationship of the multiple pulse amplitudes includes: Acquire the number of sensors used to collect the vibration signal to obtain a first number, and acquire the number of the cylinders to obtain a second number, wherein there are multiple sensors; Determine a magnitude relationship between the first quantity and the second quantity; When the first number is greater than or equal to the second number, obtaining a sensor corresponding to a maximum value among the plurality of pulse amplitudes, and determining that the cylinder whose distance to the sensor is less than or equal to a first distance is the abnormal noise cylinder; When the first number is smaller than the second number, obtain the sensor corresponding to the maximum value among the multiple pulse amplitudes, and determine that the cylinder whose distance to the sensor is less than or equal to a second distance is the abnormal noise cylinder, wherein the second distance is larger than the first distance.

5. The method according to claim 3, characterized in that: Performing pulse matching processing on the valve timing phase and the pulse position to obtain a preliminary matching relationship includes: Calculate the difference between any two phases of the first abnormal sounds to obtain a first phase difference; Calculating the difference between any two of the valve timing phases to obtain a plurality of second phase differences, wherein the valve is the intake valve or the exhaust valve; The valve corresponding to the second phase difference that is the same as the first phase difference is determined to be the preliminary abnormal-noise valve corresponding to the pulse signal.

6. The method according to claim 3, characterized in that: Get the missing tooth phase, including: Acquire a speed signal of the engine, wherein the speed signal at least includes a plurality of pulse signals; Determine that the pulse signal with the largest pulse width among the plurality of pulse signals is a tooth missing signal; The phase corresponding to the start time corresponding to the missing tooth signal is determined as the missing tooth phase.

7. The method according to claim 3, characterized in that Determining the matching relationship according to the missing tooth phase and the second abnormal sound phase includes: Calculating a difference between the second abnormal sound phase and the missing tooth phase to obtain a third phase difference; The valve corresponding to the valve timing phase having the same absolute value as the third phase difference is determined to be the valve corresponding to the pulse signal.

8. A device for determining abnormal valve noise of an engine, characterized in that: The engine comprises a plurality of cylinders, each of the cylinders comprises a set of intake valves and a set of exhaust valves, wherein the device comprises: an acquisition unit, configured to acquire a vibration signal of a predetermined area during operation of the engine, wherein the predetermined area is a cylinder head of the cylinder; a first processing unit, configured to process the vibration signal to extract a pulse feature of the vibration signal, wherein the pulse feature includes a pulse position of the vibration signal and a pulse amplitude of the vibration signal, wherein the pulse position is used to characterize a position of the pulse signal in the vibration signal, and the pulse amplitude is used to characterize an amplitude of the pulse signal; A second processing unit is used to determine the corresponding relationship between the pulse signal and the valve to obtain a matching relationship, where the valve in the matching relationship is the intake valve or the exhaust valve; The determination unit is used to obtain an amplitude threshold, determine that the pulse signal whose pulse amplitude is greater than the amplitude threshold is an abnormal signal, and determine that the valve corresponding to the abnormal signal is an abnormal-noise valve based on the matching relationship.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

10. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to execute the method according to any one of claims 1 to 7 through the computer program.

Images