Method and device for determining abnormal sound of valve of engine, and storage medium

Abstract

The application provides a method and device for determining abnormal valve of engine and storage medium. The engine comprises a plurality of cylinders, each cylinder comprising a group of intake valves and a group of exhaust valves. The method comprises: obtaining vibration signals of a predetermined region during engine operation, the predetermined region being the cylinder head of the cylinder; processing the vibration signals to extract pulse characteristics of the vibration signals, the pulse characteristics comprising pulse position of the vibration signals and pulse amplitude of the vibration signals; determining the correspondence between the pulse signals and the valves, obtaining a matching relationship, the valve being the intake valve or the exhaust valve; 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 the abnormal valve according to the matching relationship. The method solves the problem of low accuracy in determining the abnormal valve of the engine.

Description

TECHNICAL FIELD

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

[0002] In the prior art, valve seating noise caused by abnormal valve clearance accounts for a major component of valve train abnormal noise. SUMMARY

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

[0004] According to an aspect of the present application, a method for determining abnormal valve of an engine is provided, the engine comprising a plurality of cylinders, each of the cylinders comprising a set of intake valves and a set of exhaust valves, wherein the method comprises: obtaining a vibration signal of a predetermined region during operation of the engine, wherein the predetermined region is at a 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, the pulse position being used to represent a position of a pulse signal in the vibration signal, and the pulse amplitude being used to represent an amplitude of the pulse signal; determining a correspondence between the pulse signal and a valve to obtain a matching relationship, the valve being the intake valve or the exhaust valve; obtaining an amplitude threshold value, determining a pulse signal with a pulse amplitude greater than the amplitude threshold value as an abnormal signal, and determining the valve corresponding to the abnormal signal as an abnormal valve according to the matching relationship.

[0005] Optionally, processing the vibration signal to extract a pulse feature of the vibration signal comprises: processing the vibration signal using continuous wavelet transform or sparse representation method to obtain a processed vibration signal; determining the pulse position and the pulse amplitude according to the processed vibration signal.

[0006] Optionally, the correspondence between the pulse signal and the valve is determined to obtain a matching relationship, including: determining a plurality of abnormal sound cylinders according to a size relationship of a plurality of pulse amplitudes, wherein the abnormal sound cylinder is the cylinder in which an abnormal sound fault occurs; obtaining a valve timing and a plurality of first abnormal sound phases, and performing pulse matching processing on the valve timing and the pulse position to obtain a preliminary matching relationship, wherein the valve timing is a phase value corresponding to any one of the intake valve and the exhaust valve, the first abnormal sound phase is a phase value corresponding to the intake valve and the exhaust valve of the abnormal sound cylinder, and the preliminary matching relationship is used to represent the correspondence between the pulse signal and the preliminary abnormal sound valve; obtaining a missing tooth phase, and determining the matching relationship according to the missing tooth phase and a second abnormal sound phase, wherein the missing tooth phase is a phase corresponding to a missing tooth in a signal gear of the engine, the second abnormal sound phase is a phase value corresponding to the preliminary abnormal sound valve, and the pulse signal and the valve correspond to each other.

[0007] Optionally, a plurality of abnormal sound cylinders are determined according to a size relationship of a plurality of pulse amplitudes, including: obtaining a number of sensors used to collect the vibration signal to obtain a first number, and obtaining a number of the cylinders to obtain a second number, wherein the sensors are multiple; determining a size relationship between the first number and the second number; in the case that the first number is greater than or equal to the second number, obtaining a sensor corresponding to a maximum value in the plurality of pulse amplitudes, and determining the cylinder with a distance less than or equal to a first distance from the sensor as the abnormal sound cylinder; in the case that the first number is less than the second number, obtaining a sensor corresponding to a maximum value in the plurality of pulse amplitudes, and determining the cylinder with a distance less than or equal to a second distance from the sensor as the abnormal sound cylinder, wherein the second distance is greater than the first distance.

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

[0009] Optionally, the missing tooth phase is obtained, including: obtaining a speed signal of the engine, the speed signal including at least a plurality of pulse signals; determining a pulse signal with a maximum pulse width in the plurality of pulse signals as a missing tooth signal; determining a phase corresponding to a starting time corresponding to the missing tooth signal as the missing tooth phase.

[0010] Optionally, the matching relationship is determined according to the tooth missing phase and the second abnormal sound phase, including: calculating a difference between the second abnormal sound phase and the tooth missing phase to obtain a third phase difference; determining a valve corresponding to the matching relationship as the valve corresponding to the pulse signal, the valve corresponding to the matching relationship being a valve corresponding to the matching relationship.

[0011] According to another aspect of the present application, there is provided a device for determining an abnormal sound valve of an engine, the engine comprising a plurality of cylinders, each of the cylinders comprising 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 region during operation of the engine, the predetermined region being 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, the pulse feature comprising a pulse position of the vibration signal and a pulse amplitude of the vibration signal, the pulse position being used to represent a position of a pulse signal in the vibration signal, and the pulse amplitude being used to represent an amplitude of the pulse signal; a second processing unit configured to determine a corresponding relationship between the pulse signal and a valve, to obtain a matching relationship, the valve being the intake valve or the exhaust valve; and a determination unit configured to acquire an amplitude threshold, determine a pulse signal with an amplitude greater than the amplitude threshold as an abnormal signal, and determine the valve corresponding to the abnormal signal as the abnormal sound valve according to the matching relationship.

[0012] According to still another aspect of the present application, there is provided a computer readable storage medium comprising a stored program, wherein the program, when executed, controls a device in which the computer readable storage medium is located to perform any of the methods.

[0013] According to yet another aspect of the present application, there is provided an electronic device comprising a memory and a processor, the memory storing a computer program, and the processor being configured to execute the computer program to perform any of the methods.

[0014] The technical scheme of the application provides a method for determining abnormal valves of an engine. The engine comprises a plurality of cylinders, each of which comprises a set of intake valves and a set of exhaust valves. Firstly, vibration signals of a predetermined area during operation of the engine are acquired, the predetermined area being a cylinder head. Then, the vibration signals are processed to extract pulse characteristics of the vibration signals, the pulse characteristics comprising pulse positions and pulse amplitudes of the vibration signals, the pulse positions being used to represent positions of pulse signals in the vibration signals, and the pulse amplitudes being used to represent amplitudes of the pulse signals. Next, a corresponding relationship between the pulse signals and the valves is determined, the valves being the intake valves or the exhaust valves, to obtain a matching relationship. Finally, pulse signals with pulse amplitudes greater than an amplitude threshold are determined as abnormal signals, and the valves corresponding to the abnormal signals are determined as the abnormal valves according to the matching relationship. The vibration signals of the cylinder head during operation of the engine are acquired, and the pulse positions and the pulse amplitudes are extracted to represent the pulse characteristics of the vibration signals. The corresponding relationship between the pulse signals and the valves can be determined through feature matching of the pulse characteristics. The abnormal valves of the engine can be automatically detected through comparison between the pulse amplitudes and the amplitude threshold. Compared with the ear determination method, the method can improve the detection accuracy and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein in conjunction with the description of the application. In the drawings:

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for executing a method for determining abnormal valves of an engine is shown according to an embodiment of the application;

[0017] Figure 2 A flowchart of a method for determining abnormal valves of an engine is shown according to an embodiment of the application;

[0018] Figure 3 A schematic diagram of a corresponding relationship between a sensor and a cylinder is shown according to an embodiment of the application;

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

[0020] Figure 5 Another schematic diagram of a corresponding relationship between a sensor and a cylinder is shown according to an embodiment of the application;

[0021] Figure 6 Another waveform diagram of a pulse signal acquired by a sensor is shown according to an embodiment of the application;

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

[0023] Figure 8 A schematic diagram showing a rotational speed signal and phase correspondence relationship provided in an embodiment of the present application is shown;

[0024] Figure 9 A specific flow schematic diagram of a method for determining an abnormal valve of an engine provided in an embodiment of the present application is shown;

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

[0026] Among the above drawings, the following reference signs are included:

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

[0028] It should be noted that the embodiments and features in the present application can be combined with each other without conflict. 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 persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0031] As introduced in the background technology, the accuracy of determining the abnormally noisy valves 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 abnormally noisy valves of an engine, a device for determining the abnormally noisy valves 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 with reference to 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 This is a hardware structure block diagram of a mobile terminal for 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) a processor 102 (the processor 102 may include but is not limited to a microprocessor MCU or a programmable logic device FPGA and other processing devices) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It will 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 than shown, or with Figure 1 Different configurations shown.

[0034] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as the computer program corresponding to the method for determining abnormal valve of an engine in the embodiments of the present application. The processor 102 can execute various functional applications and data processing, i.e., implement the above method, by running the computer program stored in the memory 104. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, and the remote memory can be connected to the mobile terminal through a network. Examples of the 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 through a network. The specific examples of the network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (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 can be a radio frequency (RF) module which is used to communicate with the Internet in a wireless manner.

[0035] In the embodiments, a method for determining abnormal valve 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 is a flowchart of the method for determining abnormal valve of an engine according to the embodiments of the present application. The engine includes a plurality of cylinders, and each of the cylinders includes a set of intake valves and a set of exhaust valves. As shown in Figure 2 the method includes the following steps:

[0037] In step S201, a vibration signal of a predetermined region during operation of the engine is obtained, wherein the predetermined region is a cylinder head of the cylinder.

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

[0039] Step S202, the vibration signal is processed to extract the pulse characteristics of the vibration signal, wherein 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 represent the position of the pulse signal in the vibration signal, and the pulse amplitude is used to represent 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 characteristics, which can reflect the signal characteristics of the abnormal sound of the valve train.

[0041] Step S203, 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;

[0042] Specifically, each valve will excite a pulse signal, but the degree of pulse signal excited by different valves is different. Through relationship matching, it can be determined which exhaust valve or intake valve of which cylinder each pulse signal corresponds to.

[0043] Step S204, obtain an amplitude threshold, determine the pulse signal with a pulse amplitude greater than the amplitude threshold as an abnormal signal, and determine the valve corresponding to the abnormal signal as an abnormal sound valve according to the matching relationship.

[0044] Specifically, according to the mechanical structure and operation mechanism of the engine, the types of abnormal sound of the valve train mainly include the following: 1) valve seating noise; 2) knocking sound between rocker arm and valve rod; 3) knocking noise between rocker arm and valve bridge; 4) friction noise between cam and tappet; 5) timing gear noise. In the case of normal engine lubrication and timing gear meshing, normal cam profile design, and normal part stiffness and mass design, valve gap abnormality caused valve seating noise accounts for the main component of the valve train abnormal sound. In practical application, the amplitude threshold of abnormal sound determination can be determined by simulation and test method. If the pulse amplitude exceeds the threshold, it is determined that the abnormal sound is generated, and the valve that excites the pulse is the abnormal sound valve, thereby realizing abnormal sound determination and positioning at the same time. Compared with the prior art, the abnormal sound fault positioning can only be positioned to the cylinder, i.e. which cylinder has an abnormal sound fault, and the scheme of the present application can be positioned to the valve, i.e. which exhaust valve or intake valve has an abnormal sound fault.

[0045] The embodiment provides a method for determining abnormal sound valves of an engine. The engine comprises a plurality of cylinders, each of the cylinders comprises a set of intake valves and a set of exhaust valves. Firstly, vibration signals of a predetermined area of the engine during operation are acquired, the predetermined area being a cylinder head of the cylinder; then, the vibration signals are processed to extract pulse characteristics of the vibration signals, the pulse characteristics comprising pulse positions of the vibration signals and pulse amplitudes of the vibration signals, the pulse position being used to represent the position of the pulse signal in the vibration signal, and the pulse amplitude being used to represent the amplitude of the pulse signal; the correspondence between the pulse signal and the valve is determined to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve; finally, the pulse signal with the pulse amplitude greater than an amplitude threshold is determined as an abnormal signal, and the valve corresponding to the abnormal signal is determined as the abnormal sound valve according to the matching relationship. The vibration signals of the cylinder head position during the operation of the engine are acquired, and the pulse position and the pulse amplitude are extracted to represent the pulse characteristics of the vibration signals. The correspondence between the pulse signal and the valve can be determined through the feature matching of the pulse characteristics. The automatic detection of the abnormal sound valve of the engine can be realized through the comparison between the pulse amplitude and the amplitude threshold. Compared with the ear determination method, the method can improve the accuracy of detection and the efficiency of detection.

[0046] In the implementation process, the step S202 can be implemented by the following steps: in step S2021, the continuous wavelet transform or the sparse representation method is used to process the vibration signal to obtain the processed vibration signal; and in step S2022, the pulse position and the pulse amplitude are determined according to the processed vibration signal. The method can further improve the accuracy of the extracted pulse characteristics.

[0047] Specifically, the step of processing the vibration signal by using the continuous wavelet transform or the sparse representation method includes the following stages: firstly, the original vibration signal is preprocessed as necessary, such as denoising, filtering and the like, to improve the effect of subsequent processing. A suitable wavelet basis function and scale parameter are selected, and the continuous wavelet transform is applied to convert the signal in the time domain to the time-frequency domain to obtain the time-frequency representation of the signal. The matching pursuit algorithm or other sparse decomposition methods are used 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, shift, frequency and phase. Useful features are extracted from the transformed signal, such as the amplitude of the wavelet coefficient, the frequency and the like. For sparse representation, five-dimensional features such as sparse coefficient, scale, shift, frequency and phase can be extracted.

[0048] To further obtain an accurate matching relationship, the step S203 can be implemented by the following steps: in step S2031, a plurality of abnormal sound cylinders are determined according to the size relationship of a plurality of pulse amplitudes, wherein the abnormal sound cylinder is the cylinder that has an abnormal sound fault; in step S2032, a valve timing and a plurality of first abnormal sound phases are obtained, and pulse matching processing is performed on the valve timing and the pulse position to obtain a preliminary matching relationship, wherein the valve timing is a phase value corresponding to any one of the intake valve and the exhaust valve, the first abnormal sound phase is a phase value corresponding to the intake valve and the exhaust valve of the abnormal sound cylinder, and the preliminary matching relationship is used to represent the corresponding relationship between the pulse signal and the preliminary abnormal sound valve; in step S2033, a missing tooth phase is obtained, and the matching relationship is determined according to the missing tooth phase and a second abnormal sound phase, wherein the missing tooth phase is a phase corresponding to a missing tooth in the signal gear of the engine, the second abnormal sound phase is a phase value corresponding to the preliminary abnormal sound valve, and the pulse signal and the valve correspond one by one.

[0049] Specifically, the above-mentioned method realizes pulse matching by three steps of inferring the corresponding valve of the excitation pulse. First inference: a plurality of abnormal sound cylinders are determined according to the size relationship of a plurality of pulse amplitudes. Second inference: the possible corresponding preliminary abnormal sound valve is matched according to the valve timing information of the engine. Third inference: the feasible solution of the abnormal sound valve is further determined in combination with the missing tooth phase.

[0050] The step S2031 can also be implemented by other methods, for example: in step S20311, the number of sensors used to collect the vibration signal is obtained to obtain a first number, and the number of cylinders is obtained to obtain a second number, wherein the sensor has a plurality of sensors; in step S20312, the size relationship between the first number and the second number is determined; in step S20313, when the first number is greater than or equal to the second number, the sensor corresponding to the maximum value in the plurality of pulse amplitudes is obtained, and the cylinder with a distance less than or equal to a first distance from the sensor is determined as the abnormal sound cylinder; in step S20314, when the first number is less than the second number, the sensor corresponding to the maximum value in the plurality of pulse amplitudes is obtained, and the cylinder with a distance less than or equal to a second distance from the sensor is determined as the abnormal sound cylinder, wherein the second distance is greater than the first distance. This method can further quickly and preliminarily determine the pulse source by comparing the amplitudes of the same pulse signal perceived by different sensors.

[0051] Specifically, taking the case where the number of sensors is the same as the number of cylinders as an example, as shown in FIG. 2, the number of sensors is the same as the number of cylinders, and the sensor corresponding to the maximum value in the plurality of pulse amplitudes is determined as the abnormal sound cylinder. Figure 3As shown, sensor I, sensor II, sensor III, sensor IV, sensor V and sensor VI are arranged in one-to-one correspondence with cylinder 1, cylinder 2, cylinder 3, cylinder 4, cylinder 5 and cylinder 6. The pulse features extracted from the signals collected by the first three sensors, i.e., sensor I, sensor II and sensor III, are as shown in Table 1. Figure 4 As shown, the numbers in the horizontal axis, taking 51 and 22 as examples, 51 is used to represent the exhaust port of cylinder 5, and 22 is used to represent the intake port of cylinder 2, and the vertical axis represents the size of the pulse amplitude. The pulse amplitude detected by sensor II is larger than the pulse amplitude at the adjacent cylinder head, and thus it can be determined that the excitation source of the pulse is the valve of cylinder 2, that is, cylinder 2 is the abnormal noise cylinder. Taking the case where the number of sensors is less than the number of cylinders as an example, as shown in Figure 5 As shown, sensor II is arranged in correspondence with cylinder 1, cylinder 2, cylinder 3 and cylinder 4, and sensor V is arranged in correspondence with cylinder 5 and cylinder 6. The pulse features extracted from the signals collected by sensor II and sensor V are as shown in Table 1. Figure 6 As shown, the pulse amplitude detected by sensor II is larger than the pulse amplitude detected by sensor V, and thus 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 abnormal noise cylinders. In another embodiment, as shown in Figure 5 As shown, the pulse features extracted from the signals collected by sensor II and sensor V are as shown in Table 1. The pulse amplitude collected by sensor V is larger than the pulse amplitude collected by sensor II, and thus it can be determined that the excitation source of the two pulses can be cylinder 3, cylinder 4, cylinder 5 and cylinder 6, and there are multiple different combinations. In addition, Figure 5 Compared with Figure 3 , the number of sensors used is smaller, and in Figure 3 , 6 sensors need to be arranged, while in Figure 5 , only 2 sensors need to be arranged, which can further reduce the cost.

[0052] Table 1

[0053]

[0054] In some embodiments, the step S2032 can be implemented by the following steps: step S20321, calculating the difference between any two of the first abnormal noise phases to obtain a first phase difference; step S20322, 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; and step S20323, determining that the valve corresponding to the second phase difference identical to the first phase difference is the preliminary abnormal noise valve corresponding to the pulse signal. This method can further quickly determine the corresponding relationship between the pulse signal and the preliminary abnormal noise valve.

[0055] Specifically, the phase corresponding relationship with the valve closing is as shown in Figure 7 The number in the horizontal axis represents cylinder 1, and the vertical axis represents the exhaust valve or the intake valve. Taking the case of cylinder 1, the exhaust valve, and the horizontal axis as C1 and the vertical axis as the exhaust valve, it is indicated 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 preliminary response valve is Figure 7 The three groups of valves in the dashed line are the second step of the inference result: 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 a speed signal of the engine, the speed signal comprising at least a plurality of pulse signals; step S20332, determining that the pulse signal with the maximum pulse width in the plurality of pulse signals is a missing tooth signal; and step S20333, determining that the phase corresponding to the start time corresponding to the missing tooth signal is 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 speed signal. The Hall effect sensor detects the tooth groove position 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 known as a notch, and when the missing tooth passes through the sensor, it is usually used to mark the top dead center of the engine.

[0058] The above-mentioned 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; and step S20335, determining that the valve corresponding to the valve corresponding to the third phase difference is the same as the absolute value of the valve corresponding to the pulse signal. This method can further quickly match the corresponding relationship between the pulse signal and the valve.

[0059] Specifically, as shown in Figure 7 and Figure 8 When the missing tooth passes through the sensor, the exhaust valve of cylinder 1 or cylinder 6 is closed, and the position of the circle in Figure 7 and Figure 8 In this case, the waveform diagram will have the following characteristics, as shown in Figure 8As shown, first, in the tooth missing position, the Hall effect sensor cannot detect the gear teeth, so a low level gap longer than the normal pulse width will appear in the waveform. This tooth missing caused gap corresponds to the top dead center of the engine. Second, the tooth missing position is fixed, so this long gap will periodically appear in the waveform in each engine cycle. This feature can be used to accurately locate the top dead center of the engine. In addition to the tooth missing caused long gap, other parts of the waveform are still normal square wave signals. This means that before and after the tooth missing, the sensor output signal still maintains the pulse width corresponding to the tooth gap of the timing gear. The timing gear rotates two revolutions is a complete cycle of four-stroke. As Figure 8 As shown, at phase 0° and 360° (circle position), corresponding to the exhaust stroke or compression stroke top dead center position, corresponding to the position of the exhaust valve of cylinder 1 or cylinder 6 closing. Taking the tooth missing phase of 570.3° as an example, taking the phase 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 449.6° corresponding to the valve (360°+89.6°), as Figure 7 As shown, corresponding to the intake valve closing of cylinder 3 and the intake valve closing of cylinder 4. Combined with the above determination result of the preliminary response valve, 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 solutions of the present application, the implementation process of the determination method of the abnormal sound valve of the engine of the present application will be described in detail below in conjunction with specific embodiments.

[0061] The present embodiment relates to a specific determination method of the abnormal sound valve of the engine, as Figure 9 As shown, comprising the following steps:

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

[0063] Step S2: pulse extraction is performed on the vibration signal to obtain pulse time coordinates and pulse amplitude;

[0064] Step S3: determining whether an abnormal sound failure occurs according to the size relationship between the pulse amplitude and the set threshold value;

[0065] Step S4: in the case of an abnormal sound failure, pulse matching is performed according to the pulse time coordinates and the valve timing to obtain a matching relationship, so as to determine the corresponding relationship between the pulse signal and the valve;

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

[0067] The embodiment of the present application further provides a device for determining abnormal sound valves of an engine. It should be noted that the device for determining abnormal sound valves of an engine can be used to execute the method for determining abnormal sound valves of an engine provided by the embodiment of the present application. The device is used to realize the above-mentioned embodiment and preferred embodiment, and will not be described here. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiment is preferably realized in software, realization in hardware or a combination of software and hardware is also possible and contemplated.

[0068] The device for determining abnormal sound valves of an engine provided by the embodiment of the present application is described below.

[0069] Figure 10 FIG. 1 is a schematic diagram of a device for determining abnormal sound valves of an engine according to the embodiment of the present application. The engine includes a plurality of cylinders, each of which includes a set of intake valves and a set of exhaust valves. As shown in FIG. 1, the device includes: Figure 10

[0070] The acquisition unit 10 is configured to acquire a vibration signal of a predetermined region during operation of the engine, wherein the predetermined region is a cylinder head of the cylinder.

[0071] Specifically, the vibration signal is the most direct representation of abnormal sound of the valve train. Using the vibration signal as the core input to determine whether the valve train has an abnormal sound fault can improve the reliability of the abnormal sound fault determination.

[0072] The first processing unit 20 is configured to process the vibration signal to extract pulse characteristics of the vibration signal, wherein the pulse characteristics include a pulse position of the vibration signal and a pulse amplitude of the vibration signal, the pulse position is used to represent the position of the pulse signal in the vibration signal, and the pulse amplitude is used to represent the amplitude of the pulse signal.

[0073] Specifically, using the pulse position of the vibration signal and the pulse amplitude of the vibration signal as pulse characteristics can reflect the signal characteristics of the abnormal sound of the valve train.

[0074] The second processing unit 30 is configured to determine a correspondence 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 can excite a pulse signal, but the degree of the pulse signal excited by different valves is different. 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 based on the matching relationship.

[0077] Specifically, based on the mechanical structure and operating mechanism of the engine, the main types of abnormal noise in the valve train are as follows: 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 component stiffness and quality design are normal, the valve seating noise caused by abnormal valve clearance accounts for the main component of the abnormal noise in 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 the abnormal noise valve, thereby achieving both abnormal noise determination and location. Compared with the existing technology, abnormal noise fault location can only locate the cylinder, that is, which cylinder has an abnormal noise fault, while 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] This embodiment provides a device for determining abnormally noisy valves in an engine. The engine includes multiple cylinders, each of which includes a set of intake valves and a set of exhaust valves. An acquisition unit acquires vibration signals from a predetermined region during engine operation, the predetermined region being the cylinder head. A first processing unit processes the vibration signals to extract pulse characteristics of the vibration signals, which include pulse position and pulse amplitude. The pulse position characterizes the position of the pulse signal within the vibration signal, and the pulse amplitude characterizes the amplitude of the pulse signal. A second processing unit determines a correspondence between the pulse signals and valves, obtaining a matching relationship, wherein the valves are either intake valves or exhaust valves. A determination unit determines that a pulse signal with a pulse amplitude greater than an amplitude threshold is an abnormal signal, and determines, based on the matching relationship, that the valve corresponding to the abnormal signal is an abnormally noisy valve. By acquiring vibration signals from the cylinder head during engine operation, the pulse position and pulse amplitude are extracted to characterize the pulse characteristics of the vibration signals. The corresponding relationship between the pulse signals and valves can be determined through feature matching of the pulse characteristics. Automatic detection of abnormally noisy valves in the engine can be achieved by comparing the pulse amplitude with the amplitude threshold. Compared with the human ear judgment method, this method can improve the detection accuracy and efficiency.

[0079] In the implementation process, the first processing unit includes a first processing module and a first determination module. The first processing module is configured to process the vibration signal by using continuous wavelet transform or a sparse representation method to obtain a processed vibration signal. The first determination module is configured to determine the pulse position and the pulse amplitude based on the processed vibration signal. The device can further improve the accuracy of the extracted pulse features.

[0080] Specifically, the step of processing the vibration signal by using continuous wavelet transform or a sparse representation method includes the following stages: first, the original vibration signal is preprocessed as necessary, such as denoising, filtering, etc., to improve the effect of subsequent processing. A suitable wavelet basis function and scale parameter are selected, and continuous wavelet transform is applied to convert the signal in the time domain to the time-frequency domain to obtain the time-frequency representation of the signal. The signal is decomposed into a series of atoms (or basis functions) with different characteristics by using a matching pursuit algorithm or other sparse decomposition methods. Each atom contains certain characteristic information of the signal, such as scale, displacement, frequency, and phase. Useful features are extracted from the transformed signal, such as the amplitude of the wavelet coefficients, the frequency, etc. 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 second processing unit includes a second determination module, a second processing module, and a third determination module. The second determination module is configured to determine a plurality of abnormal noise cylinders based on the size relationship of a plurality of pulse amplitudes, wherein the abnormal noise cylinder is the cylinder that has an abnormal noise fault. The second processing module is configured to obtain 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 represents the corresponding relationship between the pulse signal and the preliminary abnormal noise valve. The third determination module is configured to obtain a missing tooth phase and determine the matching relationship based on the missing tooth phase and a second abnormal noise phase, wherein the missing tooth phase is a phase corresponding to a missing tooth in the signal gear of the engine, the second abnormal noise phase is a phase value corresponding to the preliminary abnormal noise valve, and the pulse signal and the valve are one-to-one.

[0082] Specifically, the above method determines the valve corresponding to the excited pulse in three steps to realize pulse matching. First speculation: determine a plurality of abnormal noise cylinders based on the size relationship of a plurality of pulse amplitudes. Second speculation: match the possible corresponding preliminary abnormal noise valve based on the valve timing information of the engine. Third speculation: further determine the feasible solution of the abnormal noise valve in combination with the missing tooth phase.

[0083] The second determining module includes a first obtaining sub-module, a first determining sub-module, a second obtaining sub-module, and a second determining sub-module. The first obtaining sub-module is configured to obtain the number of sensors used to collect the vibration signals, to obtain a first number, and to obtain the number of cylinders, to obtain a second number. The sensors are multiple. The first determining sub-module is configured to determine the size relationship between the first number and the second number. The second obtaining sub-module is configured to, when the first number is greater than or equal to the second number, obtain the sensor corresponding to the maximum value of the multiple pulse amplitudes, and to determine the cylinder having a distance less than or equal to a first distance from the sensor as the abnormal sound cylinder. The second determining sub-module is configured to, when the first number is less than the second number, obtain the sensor corresponding to the maximum value of the multiple pulse amplitudes, and to determine the cylinder having a distance less than or equal to a second distance from the sensor as the abnormal sound cylinder. 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 signals sensed by different sensors.

[0084] Specifically, taking the number of sensors being the same as the number of cylinders as an example, as shown in FIG. 1, the sensor I, the sensor II, the sensor III, the sensor IV, the sensor V, and the sensor VI are arranged in one-to-one correspondence with the cylinder 1, the cylinder 2, the cylinder 3, the cylinder 4, the cylinder 5, and the cylinder 6. The pulse features extracted from the signals collected by the first three sensors, i.e., the sensor I, the sensor II, and the sensor III, are as shown in FIG. 2. In the figure, the numbers in the horizontal axis take 51 and 22 as examples. 51 is used to represent the exhaust port of the cylinder 5, and 22 is used to represent the intake port of the cylinder 2. The vertical axis represents the size of the pulse amplitude. The pulse amplitude detected by the sensor II is greater 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 the cylinder 2, that is, the cylinder 2 is the abnormal sound cylinder. Taking the number of sensors being less than the number of cylinders as an example, as shown in FIG. 3, the sensor II is arranged in correspondence with the cylinder 1, the cylinder 2, the cylinder 3, and the cylinder 4, and the sensor V is arranged in correspondence with the cylinder 5 and the cylinder 6. The pulse features extracted from the signals collected by the sensor II and the sensor V are as shown in FIG. 4. The pulse amplitude detected by the sensor II is greater than the pulse amplitude detected by the sensor V. Therefore, it can be determined that the excitation source of the pulse is the valve of the cylinder 1, the cylinder 2, the cylinder 3, and the cylinder 4, that is, the cylinder 1, the cylinder 2, the cylinder 3, and the cylinder 4 are the abnormal sound cylinders. Figure 3 Figure 4 Figure 5 Figure 6 Figure 5 ​​​​The pulse characteristics extracted from the signals collected by the sensors and cylinders shown in Table 1 are shown. The pulse amplitude collected by sensor V is larger than that collected by sensor II. Therefore, it can be determined that the excitation sources of these two pulses may be cylinders 3, 4, 5, and 6, and there are many different combinations. In addition, Figure 5 and Figure 3 Compared with the Figure 3 In the need to set up 6 sensors, and 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. The first calculation submodule is configured to calculate the difference between any two of the first abnormal noise phases to obtain a first phase difference. The second calculation submodule is configured to calculate the difference between any two of the valve timing phases to obtain multiple second phase differences, where the valve is the intake valve or the exhaust valve. The third determination submodule is configured to determine that the valve corresponding to the second phase difference equal to the first phase difference is the preparatory abnormal noise valve corresponding to the pulse signal. This device can further quickly determine the correspondence between the pulse signal and the preparatory abnormal noise valve.

[0086] Specifically, the corresponding relationship between phase and valve closing is as follows: Figure 7 As shown, in the horizontal axis, C1 is used to represent cylinder 1, and the vertical axis represents the exhaust valve or intake valve. Taking the horizontal axis as C1 and the vertical axis as the exhaust valve as an example, it means 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 valve groups within the dotted lines, i.e., the inferred 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. The third acquisition submodule is configured to acquire an engine speed signal, which includes at least multiple pulse signals. The fourth acquisition submodule is configured to determine that the pulse signal with the largest pulse width among the multiple pulse signals is a missing tooth signal. The fifth determination submodule is configured to determine that the phase corresponding to the start time of the missing tooth signal is the missing tooth phase. This device can further quickly determine the missing tooth phase.

[0088] In practical applications, the Hall effect sensor can be used to obtain the above-mentioned rotational speed signal. The Hall effect sensor detects the tooth gap position of the timing gear and uses the voltage signal generated by the Hall effect to collect the rotational speed signal. The timing gear has a missing tooth, also known as a notch, and when the missing tooth passes through 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. The third calculation submodule is configured to calculate the difference between the second abnormal sound phase and the missing tooth phase to obtain a third phase difference. The sixth determination submodule is configured to determine that the valve corresponding to the missing tooth phase with the same absolute value as the third phase difference is the valve corresponding to the pulse signal. This device can further quickly match the corresponding relationship between the pulse signal and the valve.

[0090] Specifically, as shown in Figure 7 and Figure 8 , when the missing tooth passes through the sensor, the exhaust valve of the corresponding cylinder 1 or cylinder 6 is closed, and the position of the circle in Figure 7 and Figure 8 . In this case, the waveform will have the following characteristics, as shown in Figure 8 , first, at the missing tooth position, the Hall effect sensor will not detect the gear teeth, so there will be a longer low-level gap in the waveform than the normal pulse width. This gap caused by the missing tooth corresponds to the top dead center of the engine. Second, 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. In addition to the long gap caused by the missing tooth, the other parts of the waveform are still normal square wave signals. This means that before and after the missing tooth, the output signal of the sensor still maintains the pulse width corresponding to the tooth gap of the timing gear. The rotation of the timing gear for two revolutions is one complete cycle of four-stroke. As shown in Figure 8 , at the positions of 0° and 360° (the position of the circle), which correspond to the exhaust stroke or compression stroke top dead center position, the exhaust valve of the corresponding cylinder 1 or cylinder 6 is closed. Taking the missing tooth phase of 570.3° as an example, and taking the phase of 659.9° in Table 1 as an example, the third phase difference is 89.6°, that is, the feasible solution is the valves corresponding to 89.6° (0°+89.6°) and 449.6° (360°+89.6°), as shown in Figure 7 , which correspond to the intake valve closing of cylinder 3 and the intake valve closing of cylinder 4. Combined with the above determination result of the preliminary response valve, it can be determined that the valves corresponding to the phases of 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 determining device of the abnormal sound valve of the engine comprises a processor and a memory, the obtaining unit, the first processing unit, the second processing unit and the determining unit are stored in the memory as program units, and the corresponding functions are realized by executing the program units stored in the memory by the processor. The modules are located in the same processor, or the modules are located in different processors in any combination.

[0092] The processor comprises a core, and the core retrieves the corresponding program unit from the memory. The core can be one or more, and the engine abnormal sound valve is determined by adjusting the core parameters.

[0093] The memory can 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 memory (flash RAM), and the memory includes at least one memory chip.

[0094] The embodiment of the application provides a computer readable storage medium, and the computer readable storage medium comprises a stored program, wherein the program controls the device where the computer readable storage medium is located to execute the determining method of the abnormal sound valve of the engine when the program runs.

[0095] Specifically, the determining method of the abnormal sound valve of the engine comprises:

[0096] In step S201, the vibration signal of a predetermined region in the operation process of the engine is obtained, wherein the predetermined region is the cylinder head of the cylinder.

[0097] Specifically, the vibration signal is the most direct representation of the abnormal sound of the valve train. Using the vibration signal as the core input to judge whether the valve train has an abnormal sound fault can improve the reliability of the abnormal sound fault determination.

[0098] In step S202, the vibration signal is processed to extract the pulse feature of the vibration signal, wherein the pulse feature comprises the pulse position of the vibration signal and the pulse amplitude of the vibration signal, the pulse position is used to represent the position of the pulse signal in the vibration signal, and the pulse amplitude is used to represent 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 the pulse feature, which can reflect the signal characteristics of the abnormal sound of the valve train.

[0100] In step S203, the corresponding relationship between the pulse signal and the valve is determined to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve.

[0101] Specifically, each valve will excite a pulse signal, but the degree of the pulse signal excited by different valves is different. Through relationship matching, it can be determined which cylinder and which exhaust valve or intake valve each pulse signal corresponds to.

[0102] In step S204, an amplitude threshold is obtained, pulse signals with a pulse amplitude greater than the amplitude threshold are determined as abnormal signals, and the abnormal signal corresponding to the abnormal valve is determined according to the matching relationship.

[0103] Specifically, according to the mechanical structure and operating mechanism of the engine, the valve train abnormal sound types mainly include the following types: 1) valve seating noise; 2) knocking sound between rocker arm and valve rod; 3) knocking noise between rocker arm and valve bridge; 4) friction noise between cam and tappet; 5) timing gear noise. In the case of normal engine lubrication and timing gear meshing, normal cam profile design, and normal part stiffness and mass design, valve seating noise caused by abnormal valve clearance accounts for a major component of valve train abnormal sound. In practical applications, simulation and test methods can be used to determine the amplitude threshold for abnormal sound determination. If the pulse amplitude exceeds the threshold, it is determined that the abnormal sound is generated, and the valve that excites the pulse is the abnormal valve, thereby realizing abnormal sound determination and positioning at the same time. Compared with the prior art, abnormal fault positioning can only be positioned to the cylinder, i.e., which cylinder has an abnormal fault, while the scheme of the present application can be specifically positioned to the valve, i.e., which exhaust valve or intake valve has an abnormal fault.

[0104] The embodiment of the present application provides a processor used for running a program, wherein the processor is used for executing the determination method of the abnormal valve of the engine when the program is running.

[0105] Specifically, the determination method of the abnormal valve of the engine comprises:

[0106] In step S201, a vibration signal in a predetermined region during operation of the engine is obtained, wherein the predetermined region is a cylinder head of the cylinder.

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

[0108] In step S202, the vibration signal is processed to extract pulse characteristics of the vibration signal, wherein the pulse characteristics include a pulse position of the vibration signal and a pulse amplitude of the vibration signal, the pulse position is used to represent the position of the pulse signal in the vibration signal, and the pulse amplitude is used to represent 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 the pulse feature, which can reflect the signal characteristics of the abnormal sound of the valve train.

[0110] In step S203, a corresponding relationship between the pulse signal and the valve is determined to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve.

[0111] Specifically, each valve can excite a pulse signal, but the degree of the pulse signal excited by different valves is different. Through the relationship matching, it can be determined which exhaust valve or intake valve of which cylinder corresponds to each pulse signal.

[0112] In step S204, an amplitude threshold is obtained, the pulse signal with the pulse amplitude greater than the amplitude threshold is determined as an abnormal signal, and the valve corresponding to the abnormal signal is determined as the abnormal sound valve according to the matching relationship.

[0113] Specifically, according to the mechanical structure and operation mechanism of the engine, the types of abnormal sound of the valve train mainly include the following: 1) valve seating noise; 2) knocking sound between the rocker arm and the valve rod; 3) knocking noise between the rocker arm and the valve bridge; 4) friction noise between the cam and the tappet; 5) timing gear noise. In the case that the engine lubrication and the timing gear meshing are normal, the cam profile design and the stiffness and mass design of the parts are normal, the valve seating noise caused by the abnormal valve clearance occupies the main component in the abnormal sound of the valve train. In practical application, the amplitude threshold of the abnormal sound determination can be determined by simulation and test method. If the pulse amplitude exceeds the threshold, it is determined that the abnormal sound is generated, and the valve exciting the pulse is the abnormal sound valve, so that the abnormal sound determination and positioning can be realized at the same time. Compared with the prior art, the abnormal fault positioning can only be positioned to the cylinder, that is, which cylinder has the abnormal fault, and the scheme of the present application can be specifically positioned to the valve, that is, which exhaust valve or intake valve has the abnormal fault.

[0114] An embodiment of the present application provides a device, which comprises a processor, a memory, and a program stored on the memory and executable on the processor, and the processor implements at least the following steps when executing the program:

[0115] In step S201, a vibration signal in a predetermined region during the operation of the engine is obtained, wherein the predetermined region is the cylinder head of the cylinder.

[0116] In step S202, the vibration signal is processed 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, the pulse position is used to represent the position of the pulse signal in the vibration signal, and the pulse amplitude is used to represent the amplitude of the pulse signal.

[0117] Step S203, determining the correspondence between the pulse signal and the valve, obtaining a matching relationship, wherein the valve is the intake valve or the exhaust valve.

[0118] Step S204, obtaining an amplitude threshold, 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 the abnormal valve according to the matching relationship.

[0119] The device herein can be a server, a PC, a PAD, a mobile phone, etc.

[0120] The application further provides a computer program product adapted to execute the program of the method steps as follows when executed on a data processing device:

[0121] Step S201, obtaining a vibration signal of a predetermined region during the operation of the engine, wherein the predetermined region is the 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 represent the position of the pulse signal in the vibration signal, and the pulse amplitude is used to represent the amplitude of the pulse signal;

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

[0124] Step S204, obtaining an amplitude threshold, 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 the abnormal valve according to the matching relationship. Obviously, those skilled in the art should understand that the modules or steps of the application can be realized by a general computing device, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, which can be realized by program codes executable by the computing device, 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 different order, or they can be manufactured into individual integrated circuit modules, or multiple modules or steps can be manufactured into a single integrated circuit module. Thus, the application is not limited to any specific combination of hardware and software.

[0125] Those skilled in the art will appreciate that embodiments of the application can be readily used as software, hardware, or a combination of software and hardware. In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0126] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more functions specified in the flowchart block or blocks. Figure 1 means for functionally implementing one or more functions specified in the flowchart block or blocks.

[0127] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more functions specified in the flowchart block or blocks. Figure 1 means for functionally implementing one or more functions specified in the flowchart block or blocks.

[0128] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more functions specified in the flowchart block or blocks. Figure 1 means for functionally implementing one or more functions specified in the flowchart block or blocks.

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

[0130] The memory can include non-persistent memory and / or persistent memory, such as flash memory, read-only memory (ROM), and / or volatile / non-volatile random access memory (RAM), among others. The memory is an example of computer readable media.

[0131] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can be implemented by any method or technology to store information. The 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 technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0132] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

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

[0134] 1) The method for determining abnormal valve of engine in the application, the engine comprises a plurality of cylinders, each of the cylinders comprises a group of intake valves and a group of exhaust valves, first, the vibration signal of a predetermined area in the engine operation process is obtained, 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, 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 represent the position of the pulse signal in the vibration signal, and the pulse amplitude is used to represent the amplitude of the pulse signal; the corresponding relationship between the pulse signal and the valve is determined to obtain the matching relationship, wherein the valve is the intake valve or the exhaust valve; finally, the pulse signal with the pulse amplitude greater than the amplitude threshold is determined as the abnormal signal, and the valve corresponding to the abnormal signal is determined as the abnormal valve according to the matching relationship. By collecting the vibration signal at the cylinder head position during the engine operation process, the pulse position and the pulse amplitude are extracted to represent the pulse characteristics of the vibration signal, and the corresponding relationship between the pulse signal and the valve can be determined through the feature matching of the pulse characteristics. Through the comparison between the pulse amplitude and the amplitude threshold, the automatic detection of the abnormal valve of the engine can be realized. Compared with the ear determination method, the accuracy of detection can be improved, and the efficiency of detection can be improved.

[0135] 2) The device for determining abnormal valve of engine in the application, the engine comprises a plurality of cylinders, each of the cylinders comprises a group of intake valves and a group of exhaust valves, the acquisition unit acquires the vibration signal of a predetermined area in the engine operation process, 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 represent the position of the pulse signal in the vibration signal, and the pulse amplitude is used to represent the amplitude of the pulse signal; the second processing unit determines the corresponding relationship between the pulse signal and the valve to obtain the matching relationship, wherein the valve is the intake valve or the exhaust valve; the determination unit determines the pulse signal with the pulse amplitude greater than the amplitude threshold as the abnormal signal, and determines the valve corresponding to the abnormal signal as the abnormal valve according to the matching relationship. By collecting the vibration signal at the cylinder head position during the engine operation process, the pulse position and the pulse amplitude are extracted to represent the pulse characteristics of the vibration signal, and the corresponding relationship between the pulse signal and the valve can be determined through the feature matching of the pulse characteristics. Through the comparison between the pulse amplitude and the amplitude threshold, the automatic detection of the abnormal valve of the engine can be realized. Compared with the ear determination method, the accuracy of detection can be improved, and the efficiency of detection can be improved.

[0136] The above only describes the preferred embodiments of the application and is not intended to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method of determining a rattle valve of an engine, characterized by, The engine comprises a plurality of cylinders, each of the cylinders comprising a set of intake valves and a set of exhaust valves, and the method comprises: obtaining a vibration signal of a predetermined region during operation of the engine, wherein the predetermined region is at a cylinder head of the cylinder; processing the vibration signal to extract pulse characteristics of the vibration signal, wherein the pulse characteristics comprise a pulse position of the vibration signal and a pulse amplitude of the vibration signal, the pulse position being used to represent a position of a pulse signal in the vibration signal, and the pulse amplitude being used to represent an amplitude of the pulse signal; determining a correspondence between the pulse signal and a valve to obtain a matching relationship, wherein the valve is the intake valve or the exhaust valve; obtaining an amplitude threshold value, determining that a pulse signal with 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, determining a correspondence between the pulse signal and a valve to obtain a matching relationship, comprising: determining a plurality of abnormal noise cylinders according to a size relationship of a plurality of pulse amplitudes, wherein the abnormal noise cylinder is the cylinder with an abnormal noise fault; obtaining a valve timing and a plurality of first abnormal noise phases, and performing pulse matching processing on the valve timing and the pulse position to obtain a preliminary matching relationship, wherein the valve timing 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 represent a correspondence between the pulse signal and a preliminary abnormal noise valve; obtaining a missing tooth phase, and determining the matching relationship according to the missing tooth phase and a second abnormal noise phase, wherein the missing tooth phase is a phase corresponding to a missing tooth in a signal gear of the engine, the second abnormal noise phase is a phase value corresponding to the preliminary abnormal noise valve, and the pulse signal and the valve are one-to-one.

2. The method according to claim 1, characterized in that processing the vibration signal to extract pulse characteristics of the vibration signal, comprising: processing the vibration signal by using continuous wavelet transform or sparse representation method to obtain a processed vibration signal; determining the pulse position and the pulse amplitude according to the processed vibration signal.

3. The method of claim 1, wherein, determining a plurality of abnormal noise cylinders according to a size relationship of a plurality of pulse amplitudes, comprising: obtaining a number of sensors used to collect the vibration signal to obtain a first number, and obtaining a number of the cylinders to obtain a second number, wherein the sensors are a plurality of sensors; determining a size relationship between the first number and the second number; in a case where the first number is greater than or equal to the second number, obtaining a sensor corresponding to a maximum value in the plurality of pulse amplitudes, and determining that a cylinder with a distance less than or equal to a first distance from the sensor is the abnormal noise cylinder; in a case where the first number is less than the second number, obtaining a sensor corresponding to a maximum value in the plurality of pulse amplitudes, and determining that a cylinder with a distance less than or equal to a second distance from the sensor is the abnormal noise cylinder, wherein the second distance is greater than the first distance.

4. The method of claim 1, wherein, The pulse matching processing is performed on the gas matching phase and the pulse position to obtain a preliminary matching relationship, including: calculating the difference between any two first abnormal sound phases to obtain a first phase difference; calculating the difference between any two gas matching phases to obtain a plurality of second phase differences, wherein the valve is the intake valve or the exhaust valve; determining that the valve corresponding to the second phase difference identical to the first phase difference is the preliminary abnormal sound valve corresponding to the pulse signal.

5. The method according to claim 1, wherein Obtaining a missing tooth phase, including: obtaining a speed signal of an engine, the speed signal including at least a plurality of pulse signals; determining that the pulse signal with the maximum pulse width in the plurality of pulse signals is a missing tooth signal; determining that the phase corresponding to the starting time corresponding to the missing tooth signal is the missing tooth phase.

6. The method of claim 1, wherein, According to the missing tooth phase and the second abnormal sound phase, determining the matching relationship, 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 gas matching phase with the absolute value identical to the third phase difference is the valve corresponding to the pulse signal.

7. A device for determining abnormal valve noise of an engine, characterized in that: The engine includes a plurality of cylinders, and each cylinder includes a set of intake valves and a set of exhaust valves, wherein the device includes: an acquisition unit configured to acquire a vibration signal of a predetermined region during operation of the engine, wherein the predetermined region is at 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, the pulse position is used to represent the position of the pulse signal in the vibration signal, and the pulse amplitude is used to represent the amplitude of the pulse signal; a second processing unit configured to 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; a determination unit configured 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 sound valve according to the matching relationship, The second processing unit comprises a second determining module, a second processing module and a third determining module. The second determining module is configured to determine a plurality of abnormal sound cylinders according to a size relationship of the plurality of pulse amplitudes, wherein the abnormal sound cylinders are the cylinders with abnormal sound faults. The second processing module is configured to obtain a valve timing and a plurality of first abnormal sound phases, and perform pulse matching processing on the valve timing and the pulse positions to obtain a preliminary matching relationship, wherein the valve timing is a phase value corresponding to any one of the intake valves and the exhaust valves, the first abnormal sound phase is a phase value corresponding to the intake valve and the exhaust valve of the abnormal sound cylinder, and the preliminary matching relationship is used to represent a corresponding relationship between the pulse signal and the preliminary abnormal sound valve. The third determining module is configured to obtain a missing tooth phase, and determine the matching relationship according to the missing tooth phase and a second abnormal sound phase, wherein the missing tooth phase is a phase corresponding to a missing tooth in a signal gear of the engine, the second abnormal sound phase is a phase value corresponding to the preliminary abnormal sound valve, and the pulse signal and the valve are one-to-one corresponding.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein the program controls a device in which the computer readable storage medium is located to perform the method of any one of claims 1 to 6 when the program is running. 9.An electronic device comprising a memory and a processor, the electronic device characterized by, The memory stores a computer program, and the processor is configured to execute the method of any one of claims 1 to 6 by using the computer program.

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