Vehicle noise source identification method and device, storage medium, and electronic device

Abstract

The application provides a vehicle noise source identification method and device, a storage medium and an electronic device, and belongs to the field of automobiles, wherein the method comprises the following steps: acquiring a noise characteristic parameter of a knocking sound of a timing tensioner, wherein the timing tensioner comprises a plunger, a moving rail, a chain and an oil cavity; judging whether the noise characteristic parameter is greater than a preset threshold; if the noise characteristic parameter is greater than the preset threshold, acquiring a contact force signal of the plunger and the moving rail; and positioning a noise source of the knocking sound according to the contact force signal. Through the embodiment of the application, the technical problem of low positioning efficiency of the noise source of the timing tensioner of the vehicle in the related art is solved, the problem that it is difficult to test and troubleshoot the rotation, the lubricating oil and the internal parts is solved, the vehicle noise problem is quickly locked and optimized, and the application has strong engineering significance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobiles, in particular to a vehicle noise source identification method and device, a storage medium and an electronic device. BACKGROUND

[0002] In the related art, a vehicle chain transmission system has the advantages of compact structure, high power transmission, high reliability and wear resistance, various design forms, and lifelong maintenance-free, and many automobile products on the market use chain transmission as a timing transmission system and an oil pump transmission system. The widespread use of chain transmission also leads to problems related to the design and manufacturing process of the engine. The timing system not only has various failure problems that affect the normal operation of the engine, but also has many NVH (Noise Vibration Harshness) problems. For example, the whistling of the timing chain, the whistling of the oil pump rotor, and various abnormal noises of the timing system. Chain whistling can be analyzed according to the chain system structure and order characteristics, but the tensioning system knocking involves a wide range of components that move relative to each other, and the components are all moving parts, and there is a lot of oil, making it difficult to identify the source of the knocking.

[0003] In the related art, the methods for identifying noise sources mainly include lead shielding, near-field measurement, sound intensity, surface vibration, and acoustic holography. Because the tensioning system is always running, lead shielding cannot be performed. The near-field measurement, sound intensity, and acoustic holography methods cannot accurately identify the source due to the compact structure of the tensioning system. Furthermore, due to the need for component operation and lubrication, the surface vibration method also has great difficulty. The method for identifying the source of the knocking of the timing system generally involves directionally locking based on the characteristics of the knocking sound and the results of dynamic testing of the timing system, and then replacing and verifying the components, but the preparation time for the specially designed components for dynamic testing is long, and there is a certain degree of blindness, which cannot quickly lock the source of the knocking, thereby enabling targeted optimization.

[0004] There is no efficient and accurate solution to the above problems in the related art. SUMMARY

[0005] The present application provides a vehicle noise source identification method and device, a storage medium, and an electronic device to solve the technical problems in the related art.

[0006] According to one embodiment of the present application, a vehicle noise source identification method is provided, which includes: obtaining a noise characteristic parameter of a knocking sound of a timing tensioner, wherein the timing tensioner includes a plunger, a moving rail, a chain, and an oil cavity; determining whether the noise characteristic parameter is greater than a preset threshold; if the noise characteristic parameter is greater than the preset threshold, obtaining a contact force signal of the plunger and the moving rail; and positioning the noise source of the knocking sound according to the contact force signal.

[0007] Further, the method further comprises: obtaining an oil pressure signal of the oil chamber, obtaining vibration acceleration signals of the timing tensioner and the moving rail at the knocking time respectively, and obtaining a displacement signal of the plunger; determining whether the plunger and the moving rail are separated according to the contact force signal; if the plunger and the moving rail are separated, positioning the noise source of the knocking sound according to the vibration acceleration signal and the oil pressure signal; if the plunger and the moving rail are not separated, positioning the noise source of the knocking sound according to the oil pressure signal and the displacement signal.

[0008] Further, the method further comprises: identifying a knocking mode of the knocking sound according to the vibration acceleration signal, wherein the knocking mode comprises: plunger knocking the moving rail, chain knocking the moving rail; and positioning the noise source of the knocking sound according to the knocking mode and the oil pressure signal.

[0009] Further, the method further comprises: receiving and identifying a first vibration acceleration signal of the timing tensioner, and receiving a second vibration acceleration signal of the moving rail; recording a first receiving time of the first vibration acceleration signal, and recording a second receiving time of the second vibration acceleration signal; if the first receiving time is earlier than the second receiving time, identifying the knocking mode of the knocking sound as plunger knocking the moving rail; if the first receiving time is later than the second receiving time, identifying the knocking mode of the knocking sound as chain knocking the moving rail.

[0010] Further, the method further comprises: increasing the response rate of the timing tensioner after positioning the noise source of the knocking sound as the plunger and the moving rail being separated; or reducing the excitation of the chain by the crankshaft system and / or the camshaft system after positioning the noise source of the knocking sound as the chain and the plunger being separated.

[0011] Further, the method further comprises: calculating a vacuum degree of the oil chamber according to the oil pressure signal and the displacement signal; determining whether the vacuum degree meets a second preset condition; if the vacuum degree meets the second preset condition, positioning the noise source of the knocking sound as a component size defect of the timing tensioner; if the vacuum degree does not meet the second preset condition, positioning the noise source of the knocking sound as an abnormal vacuum degree of the oil chamber.

[0012] Further, the method further comprises: prompting the timing tensioner to replace parts after locating the noise source of the knocking sound as the component size defect of the timing tensioner; or reducing the vacuum degree of the oil cavity after locating the noise source of the knocking sound as the abnormal vacuum degree of the oil cavity.

[0013] Further, acquiring the vibration acceleration signals of the timing tensioner and the moving rail at the knocking moment respectively comprises: collecting a first vibration acceleration signal of a first vibration acceleration sensor, and collecting a second vibration acceleration signal of a second vibration acceleration sensor, wherein the first vibration acceleration sensor is arranged on a tensioner housing of the timing tensioner, the second vibration acceleration sensor is arranged on the moving rail, and the first vibration acceleration sensor and the second vibration acceleration sensor are the same distance from the contact position of the plunger and the moving rail.

[0014] According to another embodiment of the present application, a vehicle noise source identification device is provided, comprising: a first acquisition module for acquiring a noise characteristic parameter of a knocking sound of a timing tensioner, wherein the timing tensioner comprises a plunger, a moving rail, a chain, and an oil cavity; a judgment module for judging whether the noise characteristic parameter is greater than a preset threshold; a second acquisition module for acquiring a contact force signal of the plunger and the moving rail if the noise characteristic parameter is greater than the preset threshold; and a positioning module for locating a noise source of the knocking sound according to the contact force signal.

[0015] Further, the positioning module comprises: an acquisition unit for acquiring an oil pressure signal of the oil cavity, acquiring vibration acceleration signals of the timing tensioner and the moving rail at the knocking moment respectively, and acquiring a displacement signal of the plunger; a first judgment unit for judging whether the plunger and the moving rail are separated according to the contact force signal; and a first positioning unit for locating the noise source of the knocking sound according to the vibration acceleration signal and the oil pressure signal if the plunger and the moving rail are separated, and locating the noise source of the knocking sound according to the oil pressure signal and the displacement signal if the plunger and the moving rail are not separated.

[0016] Further, the first positioning unit comprises: an identification sub-unit for identifying a knocking mode of the knocking sound according to the vibration acceleration signal, wherein the knocking mode comprises: plunger knocking the moving rail, and chain knocking the moving rail; and a positioning sub-unit for locating the noise source of the knocking sound according to the knocking mode and the oil pressure signal.

[0017] Further, the identifying subunit is further configured to: receive and identify a first vibration acceleration signal of the timing tensioner, and receive a second vibration acceleration signal of the moving rail; record a first receiving time of the first vibration acceleration signal, and record a second receiving time of the second vibration acceleration signal; if the first receiving time is earlier than the second receiving time, identify that the knocking mode of the knocking sound is plunger knocking the moving rail; if the first receiving time is later than the second receiving time, identify that the knocking mode of the knocking sound is chain knocking the moving rail.

[0018] Further, the positioning subunit is further configured to: calculate a chain slack side force based on the oil pressure signal; determine whether the chain slack side force meets a first preset condition; if the chain force meets the first preset condition and the knocking mode of the knocking sound is plunger knocking the moving rail, position the noise source of the knocking sound as the plunger being disengaged from the moving rail; if the chain force does not meet the first preset condition and the knocking mode of the knocking sound is chain knocking the moving rail, position the noise source of the knocking sound as the chain being disengaged from the plunger.

[0019] Further, the positioning subunit is further configured to: increase the response rate of the timing tensioner after positioning the noise source of the knocking sound as the plunger being disengaged from the moving rail; or, decrease the excitation of the chain by the crankshaft system and / or the camshaft system after positioning the noise source of the knocking sound as the chain being disengaged from the plunger.

[0020] Further, the positioning module comprises: a calculation unit configured to calculate a vacuum degree of the oil cavity according to the oil pressure signal and the displacement signal; a second determination unit configured to determine whether the vacuum degree meets a second preset condition; and a second positioning unit configured to: if the vacuum degree meets the second preset condition, position the noise source of the knocking sound as a component size defect of the timing tensioner; and if the vacuum degree does not meet the second preset condition, position the noise source of the knocking sound as an abnormal vacuum degree of the oil cavity.

[0021] Further, the positioning module is further configured to: prompt replacement of parts of the timing tensioner after positioning the noise source of the knocking sound as the component size defect of the timing tensioner; or, decrease the vacuum degree of the oil cavity after positioning the noise source of the knocking sound as the abnormal vacuum degree of the oil cavity.

[0022] Further, the acquisition unit comprises: a collection subunit, configured to collect a first vibration acceleration signal of a first vibration acceleration sensor and a second vibration acceleration signal of a second vibration acceleration sensor, wherein the first vibration acceleration sensor is arranged on a tensioner housing of the timing tensioner, and the second vibration acceleration sensor is arranged on the moving rail, and the first vibration acceleration sensor and the second vibration acceleration sensor are the same distance from a contact position of the plunger and the moving rail.

[0023] According to another aspect of the embodiments of the present application, a storage medium is also provided, which comprises a stored program, and the program performs the steps described above when running.

[0024] According to another aspect of the embodiments of the present application, an electronic device is also provided, which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus; and the memory is configured to store a computer program, and the processor is configured to perform the steps in the above method by running the program stored in the memory.

[0025] The embodiments of the present application also provide a computer program product comprising instructions which, when executed on a computer, cause the computer to perform the steps of the above method.

[0026] According to the embodiments of the present application, the noise characteristic parameters of the knocking sound of the timing tensioner are acquired, it is judged whether the noise characteristic parameters are greater than a preset threshold, if the noise characteristic parameters are greater than the preset threshold, the contact force signal of the plunger and the moving rail is acquired, the noise source of the knocking sound is located according to the contact force signal, and the knocking source range is narrowed based on the contact vibration signal, so that targeted analysis is performed and the knocking source is quickly locked, a scheme for quickly identifying the knocking noise source of the timing tension system is provided, the technical problem of low positioning efficiency of the noise source of the vehicle timing tensioner in the related art is solved, the difficulty in testing and troubleshooting of rotation, lubricating oil and internal parts is solved, the vehicle noise problem is quickly locked and optimized, and the scheme has strong engineering significance. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application in any way. In the drawings:

[0028] Figure 1 Fig. 1 is a hardware structure block diagram of a vehicle terminal according to an embodiment of the present application;

[0029] Figure 2 Fig. 2 is a flow chart of a vehicle noise source identification method according to an embodiment of the present application;

[0030] Figure 3 Structure diagram of timing tensioner according to an embodiment of the present application;

[0031] Figure 4 Installation diagram of contact force sensor according to an embodiment of the present application;

[0032] Figure 5 Contact force test result diagram of plunger and moving rail according to an embodiment of the present application;

[0033] Figure 6 Tensioner / moving rail vibration time domain signal test result diagram according to an embodiment of the present application;

[0034] Figure 7 High / low pressure cavity pressure and plunger displacement sensor arrangement diagram according to an embodiment of the present application;

[0035] Figure 8 High / low pressure cavity oil pressure and plunger displacement test result diagram according to an embodiment of the present application;

[0036] Figure 9 High pressure cavity oil pressure result diagram after increasing low pressure cavity oil pressure according to an embodiment of the present application;

[0037] Figure 10 Cam profile optimization diagram of oil pump according to an embodiment of the present application;

[0038] Figure 11 Oil pressure comparison diagram after reducing leakage according to an embodiment of the present application;

[0039] Figure 12 Vibration comparison diagram before and after reducing vacuum degree according to an embodiment of the present application;

[0040] Figure 13 Flow chart of knock noise source analysis method of timing tensioner system based on contact signal according to an embodiment of the present application;

[0041] Figure 14 Structure block diagram of a vehicle noise source recognition device according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to better understand the present application by those skilled in the art, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0043] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological 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 an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0044] Embodiment 1

[0045] The method provided in the embodiment of the present application can be executed in a vehicle terminal, a handheld terminal, a noise locator, a computer or similar processing device. Taking the case of running on a vehicle terminal, Figure 1 is a hardware structure block diagram of a vehicle terminal according to an embodiment of the present application. As shown in Figure 1 , the vehicle terminal can include one or more (only one is shown in Figure 1 ) processor 102 (the processor 102 can include but not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data. Optionally, the above-mentioned vehicle terminal can also include a transmission device 106 for communication function and an input and output device 108. Those skilled in the art can understand that Figure 1 The structure shown is only schematic, which does not limit the structure of the above-mentioned vehicle terminal. For example, the vehicle terminal can also include more or less components than those shown in Figure 1 , or have a different configuration from Figure 1 .

[0046] The memory 104 can be used to store the vehicle terminal program, such as the software program of application software and the module, for example, the vehicle terminal program corresponding to the identification method of the vehicle noise source in the embodiment of the present application. The processor 102 executes various function applications and data processing by running the vehicle terminal program stored in the memory 104, that is, implements the above-mentioned method. The memory 104 can include a high-speed random access memory, and can also 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 these remote memories can be connected to the vehicle terminal through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0047] The transmission device 106 is used to receive or send data via a network. The specific examples of the above-mentioned network can include a wireless network provided by the communication provider of the vehicle 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.

[0048] In the embodiment, an identification method of a vehicle noise source is provided, Figure 2 is a flowchart of an identification method of a vehicle noise source according to the embodiment of the present application, which is applied to a vehicle terminal, as shown in Figure 2 The flowchart includes the following steps:

[0049] In step S202, the noise characteristic parameter of the knocking sound of the timing tensioner is acquired, wherein the timing tensioner includes a plunger, a moving rail, a chain, and an oil cavity.

[0050] Figure 3 is a structural schematic diagram of the timing tensioner in the embodiment of the present application. The structural member of the timing tensioner (timing tension system / tensioner) includes: a tensioner housing 1; a one-way valve 2; a spring 3; a pressure relief valve 4; a plunger 5; a snap spring 6; and a latch 7.

[0051] Optionally, the noise characteristic parameter includes frequency spectrum, phase, intensity, and other characteristic information. The NVH and phase signal sensor are arranged, the NVH test is performed, the characteristics of the knocking sound are acquired, and it is judged whether the knocking sound is acceptable.

[0052] In step S204, it is judged whether the noise characteristic parameter is greater than a preset threshold.

[0053] Optionally, the preset threshold of the embodiment is a threshold range, i.e., an acceptable range of the working condition of the vehicle. The judgment of whether the knocking sound is acceptable includes:

[0054] S011, a microphone is arranged at 10 cm in front of the engine timing cover, vibration sensors are arranged from top to bottom of the timing cover, crankshaft / camshaft and cylinder pressure sensors are arranged, and an NVH test is performed; the test condition is one steady state in which the knocking sound is most obvious, and the engine needs to be fully warmed up. The test needs to be tested for 3 groups, and each group needs to be more than 15 seconds.

[0055] S012, based on the test results of S011, wavelet and angle domain analysis method are applied to obtain the frequency of the knocking sound, the periodicity of the knocking sound and the phase moment relative to the engine operation, and to determine that the knocking sound comes from the timing tension system.

[0056] Wavelet analysis is performed on the noise signal to obtain the frequency, periodicity and other signals of the knocking sound, and wavelet analysis is performed on the signals of each vibration measuring point of the timing cover to determine the correlation coefficient of each vibration signal and the noise signal, so as to lock the knocking source from the timing tension system. Based on the NVH test results, the frequency of the knocking sound is 2000-12000 Hz, and the vibration at the tensioner position on the timing cover is most obvious and has the highest correlation coefficient with the knocking sound characteristics.

[0057] S013, based on the noise test results, the modulation amount of the knocking is calculated in the time domain signal, and compared with the standard. If it is less than or equal to the modulation standard, it is ended, if it is greater than the modulation standard, the noise characteristic parameter is greater than the preset threshold.

[0058] Step S206, if the noise characteristic parameter is greater than the preset threshold, the contact force signal of the plunger and the moving rail is obtained;

[0059] Optionally, a force sensor is embedded on the moving rail support frame, corresponding to the position of the tensioner plunger, so as to obtain the contact force signal of the plunger and the moving rail.

[0060] In one example, Figure 4 The contact force sensor installation schematic diagram provided for the example of the application also shows: a timing gear 8; a timing chain 9; a moving rail 10; a fixed rail 11; a force sensor 14; a tensioner shell vibration acceleration sensor 15; a moving rail vibration acceleration sensor 16. The process of obtaining the contact force of the plunger and the moving rail includes:

[0061] S021, a force sensor 14 is installed on the moving rail 10, corresponding to the contact position of the plunger and the moving rail. When installing the force sensor, the moving rail needs to be modified, the force sensor is embedded in the moving rail, the sensor and the moving rail plane are kept consistent after installation, and the force signal needs to be checked under the condition that the engine is not started, and the crankshaft is rotated.

[0062] S022. Conduct tests under conditions where the knocking sound is obvious to obtain the contact force signal between the plunger and the moving rail.

[0063] Because the knocking sound is high-frequency noise, the sampling rate of the force sensor needs to cover the knocking frequency in order to accurately observe this highly dynamic motion.

[0064] S03. Based on the test results, determine whether the moving rail and the plunger have disengaged. If the contact force is equal to 0 at a certain phase, it indicates that disengagement has occurred. If it is always greater than 0 throughout the entire 720° crankshaft rotation cycle, it indicates that disengagement has not occurred. Figure 5 The schematic diagram of the contact force test results between the plunger and the moving rail provided in this invention example shows that the cycle with abnormal noise was observed. It was found that the minimum contact force was 40N, which is greater than 0, and there was no separation.

[0065] Step S208: Locate the noise source of the knocking sound based on the contact force signal.

[0066] Through the above steps, the noise characteristic parameters of the knocking sound of the timing tensioner are obtained, and it is determined whether the noise characteristic parameters are greater than a preset threshold. If the noise characteristic parameters are greater than the preset threshold, the contact force signal between the plunger and the moving rail is obtained. The noise source of the knocking sound is located based on the contact force signal. Based on the contact vibration signal, the knocking source range is narrowed down, thereby enabling targeted analysis and rapid identification of the knocking source. This provides a solution for quickly identifying the knocking noise source of the timing tensioning system, solving the technical problem of low efficiency in locating the noise source of the vehicle timing tensioner in related technologies. It also solves the difficulties in testing and troubleshooting rotating, lubricated, and internal components, and quickly achieves vehicle noise problem identification and optimization, which has great engineering significance.

[0067] In one embodiment of this example, locating the noise source of the knocking sound based on the contact force signal includes:

[0068] S11, acquire the oil pressure signal of the oil chamber, acquire the vibration acceleration signals of the timing tensioner and the moving rail at the moment of impact, and acquire the displacement signal of the plunger;

[0069] In this embodiment, vibration sensors are arranged on the tensioner housing and the moving rail to obtain the vibration acceleration signal of the tensioner and the moving rail at the moment of impact. The oil chamber includes a high-pressure chamber and a low-pressure chamber. Oil pressure sensors are arranged in the high / low-pressure chambers of the tensioner to obtain the real-time oil pressure signal of the high / low-pressure chambers. A displacement sensor is arranged on the plunger to obtain the displacement signal of the plunger.

[0070] In one example, acquiring the vibration acceleration signals of the timing tensioner and the moving rail at the knocking moment respectively includes: collecting a first vibration acceleration signal of a first vibration acceleration sensor and a second vibration acceleration signal of a second vibration acceleration sensor, wherein the first vibration acceleration sensor is arranged on the tensioner housing of the timing tensioner, the second vibration acceleration sensor is arranged on the moving rail, and the first vibration acceleration sensor and the second vibration acceleration sensor are the same distance from the contact position of the plunger and the moving rail. If the contact position of the plunger and the moving rail is point O, the first vibration acceleration sensor and the second vibration acceleration sensor are the same distance from point O.

[0071] S12, determining whether the plunger and the moving rail are separated according to the contact force signal;

[0072] S13, if the plunger and the moving rail are separated, positioning the noise source of the knocking sound according to the vibration acceleration signal and the oil pressure signal; if the plunger and the moving rail are not separated, positioning the noise source of the knocking sound according to the oil pressure signal and the displacement signal.

[0073] In one example, positioning the noise source of the knocking sound according to the vibration acceleration signal and the oil pressure signal includes: identifying the knocking mode of the knocking sound according to the vibration acceleration signal, wherein the knocking mode includes: the plunger knocking the moving rail and the chain knocking the moving rail; and positioning the noise source of the knocking sound according to the knocking mode and the oil pressure signal.

[0074] Based on the above example, optionally, identifying the knocking mode of the knocking sound according to the vibration acceleration signal includes: receiving and identifying the first vibration acceleration signal of the timing tensioner, and receiving the second vibration acceleration signal of the moving rail; recording the first receiving moment of the first vibration acceleration signal, and recording the second receiving moment of the second vibration acceleration signal; if the first receiving moment is earlier than the second receiving moment, identifying the knocking mode of the knocking sound as the plunger knocking the moving rail; if the first receiving moment is later than the second receiving moment, identifying the knocking mode of the knocking sound as the chain knocking the moving rail.

[0075] Based on the contact force signal of the plunger and the moving rail, the number of times of separation in 180° crank angle and the separation moment are obtained; based on the noise characteristic parameters of the knocking sound, the number of knockings at each separation moment is obtained, such as one separation producing one knocking, indicating that either the chain knocks the moving rail or the moving rail knocks the plunger, such as one separation producing more than one knocking, indicating that knocking exists at both positions or knocking occurs multiple times at one position.

[0076] Figure 6The tensioner / moving rail vibration time domain signal test result schematic diagram provided for the examples of the present application shows that the tensioner shell vibration acceleration magnitude is 150g, the moving rail vibration acceleration is 50g, the tensioner vibration acceleration magnitude is greater than the moving rail, and at the same time, the tensioner shell receives the vibration signal earlier than the moving rail. If the knocking source is the chain knocking the moving rail, the transmission path of the knocking source to the moving rail measuring point 15 is nearly half shorter than the transmission path of the knocking source to the tensioner measuring point 16, but the tensioner measuring point 16 receives the signal earlier, which is contrary to the fact. If the knocking source is the moving rail knocking the plunger, the transmission path of the knocking source to the moving rail measuring point 15 is equal to the transmission path of the knocking source to the tensioner measuring point 16, and since the wave transmission speed in metal is faster than that in plastic, the tensioner receives the signal earlier, which is consistent with the fact. It is preliminarily judged that the knocking source is the moving rail knocking the plunger.

[0077] Based on the above examples, the noise source of the knocking sound can be located according to the knocking mode and the oil pressure signal, including: calculating the chain slack side force based on the oil pressure signal; judging whether the chain slack side force meets the first preset condition; if the chain force meets the first preset condition and the knocking mode of the knocking sound is the plunger knocking the moving rail, the noise source of the knocking sound is the disengagement of the plunger and the moving rail; if the chain force does not meet the first preset condition and the knocking mode of the knocking sound is the chain knocking the moving rail, the noise source of the knocking sound is the disengagement of the chain and the plunger.

[0078] Based on the vibration acceleration signal, the acceleration magnitudes of the two positions are obtained respectively, and based on the time domain signal sequence of the vibration, the knocking mode of the chain, the moving rail and the plunger is obtained. Based on the contact force test result and the oil pressure test result, the chain slack side force is calculated according to a specific model, so as to be compared with the standard to judge whether the chain force is normal.

[0079] In the present embodiment, Figure 7 The high / low pressure cavity pressure and plunger displacement sensor arrangement schematic diagram provided for the examples of the present application shows: the tensioner high pressure cavity 12; the tensioner low pressure cavity 13; the high pressure cavity oil pressure sensor 17; the low pressure cavity oil pressure sensor 18; and the plunger displacement sensor 19. The oil pressure sensors 17 and 18 are arranged in the tensioner high / low pressure cavities by punching, and the displacement sensor 19 is arranged on the plunger. The real-time signals of the high / low pressure cavity oil pressure and the plunger displacement are obtained by testing in the working condition where the knocking is obvious.

[0080] Figure 8 The high / low pressure cavity oil pressure and plunger displacement test result schematic diagram provided for the examples of the present application shows that the high / low pressure cavities appear obvious negative pressure during the process that the plunger stretches forward, which indicates that the forward movement of the plunger mainly relies on the pushing of the spring force. When the high pressure cavity appears negative pressure, the low pressure cavity oil pressure is also negative, which is only slightly higher than that of the high pressure cavity.

[0081] Optionally, the angle of the timing tensioner response rate is increased after the noise source of the knocking sound is located as the plunger is disengaged from the moving rail; or, the excitation of the chain by the crankshaft system and / or the camshaft system is reduced after the noise source of the knocking sound is located as the chain is disengaged from the plunger.

[0082] When the noise source of the knocking sound is located as the plunger is disengaged from the moving rail, the plunger can timely follow the moving rail when the chain is loose from the perspective of increasing the timing tensioner response rate, thereby solving the knocking sound generated by the disengagement of the plunger from the moving rail. The increase in the low-pressure cavity volume, the increase in the spring force, and the increase in the low-pressure cavity oil pressure can be used to achieve the purpose.

[0083] Figure 9 The schematic diagram of the high-pressure cavity oil pressure after the low-pressure cavity oil pressure is increased is provided for the examples of the present application. The target oil pressure of the low-pressure cavity is increased from 130 KPa to 500 KPa. After the increase, there is no negative pressure in the high / low-pressure cavity, the oil supplementing capacity of the low-pressure cavity is increased, the high-pressure cavity oil pressure is correspondingly increased, and the plunger following property is better. Repeated verification is performed to determine whether the knocking sound is acceptable. If acceptable, it is determined that the knocking source is the plunger knocking the moving rail.

[0084] The process of increasing the timing tensioner response rate includes: from the perspective of increasing the timing tensioner response rate, the plunger can timely follow the moving rail when the chain is loose, thereby solving the knocking sound generated by the disengagement of the plunger from the moving rail. The increase in the low-pressure cavity volume, the increase in the spring force, and the increase in the low-pressure cavity oil pressure can be used to achieve the purpose. Repeated verification is performed to determine whether the knocking sound is acceptable. If acceptable, it is determined that the knocking source is the plunger knocking the moving rail, or the chain knocking the moving rail, or both.

[0085] When the noise source of the knocking sound is located as the chain is disengaged from the plunger, the excitation of the chain by the crankshaft system and / or the camshaft system is reduced, and the fluctuation of the chain is reduced so that the chain does not disengage from the plunger. Repeated verification is performed to lock the knocking source. The process of reducing the excitation includes: from the perspective of reducing the excitation of the chain system by the crankshaft system and / or the camshaft system, the fluctuation of the chain is reduced, and the timing tensioner plunger can always follow the fluctuation of the moving rail, thereby solving the knocking sound generated by the disengagement of the plunger from the moving rail. The reduction in the valve spring force, the optimization of the camshaft profile, and the reduction in the crankshaft torsional vibration can be used to achieve the purpose. Figure 10 The schematic diagram of the optimization of the cam profile of the oil pump is provided for the examples of the present application. The camshaft profile and the high-pressure oil pump profile peak are staggered, and there is no peak-peak value superposition, thereby reducing the excitation of the chain system by the camshaft, and further reducing the fluctuation of the chain system. Repeated verification is performed to determine whether the knocking sound is acceptable. If acceptable, it is determined that the knocking source is the plunger knocking the moving rail, or the chain knocking the moving rail, or both.

[0086] In another example, the positioning of the noise source of the knocking sound according to the oil pressure signal and the displacement signal comprises: calculating the vacuum degree of the oil chamber according to the oil pressure signal and the displacement signal; judging whether the vacuum degree meets a second preset condition; if the vacuum degree meets the second preset condition, positioning the noise source of the knocking sound as a component size defect of the timing tensioner; and if the vacuum degree does not meet the second preset condition, positioning the noise source of the knocking sound as an abnormal vacuum degree of the oil chamber.

[0087] By calculating the vacuum degree of the high / low pressure chamber, the vacuum degree is compared with a standard to determine whether the vacuum degree is normal. If it is normal, in the case that all parameters are normal, the knocking source is likely to be the timing tensioner itself, and then the check spring, plunger size and other aspects are checked to see whether they meet the design requirements. After replacing qualified parts, the verification is repeated to lock the knocking source. If it is not normal, i.e. if the vacuum degree of the high / low pressure chamber is not normal, the vacuum degree of the high / low pressure chamber is reduced, and the verification is repeated to lock the knocking source.

[0088] Optionally, after positioning the noise source of the knocking sound as a component size defect of the timing tensioner, the timing tensioner is prompted to replace parts; or after positioning the noise source of the knocking sound as an abnormal vacuum degree of the oil chamber, the vacuum degree of the oil chamber is reduced.

[0089] In one example, the process of replacing parts and improving the consistency of the timing tensioner comprises: accurately measuring the check spring, plunger size, shell size and leakage amount of the timing tensioner to determine which component does not meet the design requirements. Qualified parts are replaced, and the verification is repeated to determine whether the knocking sound is acceptable. If it is acceptable, it is determined that the knocking source is an unqualified part of the timing tensioner body.

[0090] In one example, the process of reducing the vacuum degree of the high / low pressure chamber comprises: from the perspective of reducing the vacuum degree of the high / low pressure chamber, the oil supplementing capacity of the high pressure chamber is improved to make the timing tensioner more rigid, and the plunger always follows the fluctuation of the dynamic rail, thereby solving the knocking sound caused by the disconnection of the plunger and the dynamic rail. This can be achieved by improving the oil supplementing capacity of the low pressure chamber, reducing the leakage amount of the high pressure chamber, improving the oil discharge pressure of the high pressure chamber, etc.

[0091] Figure 11 The provided comparison diagram of oil pressure after reducing the leakage amount shows that the overall oil pressure of the high pressure chamber is increased, there is no negative pressure, the oil pressure of the low pressure chamber is stably at the target oil pressure position, the fluctuation disappears, there is no negative pressure, and the vacuum degree is significantly improved. Figure 12 The provided comparison diagram of vibration before and after reducing the vacuum degree shows that after improving the vacuum degree, the vibration is reduced from 132g to below 10g, the improvement is obvious, and there is no knocking sound in the subjective feeling. The verification is repeated to determine whether the knocking sound is acceptable. If it is acceptable, it is determined that the knocking source is the sudden change of force caused by the compression of air by the plunger and then the compression of oil.

[0092] The embodiment provides a system and method for quickly identifying a knocking noise source of a timing tension system based on a contact type signal. Based on the contact type vibration signal, the knocking source range is narrowed, and then the contact type oil pressure signal is used to further narrow the knocking source, so that the knocking source is analyzed in a targeted manner, the knocking source is quickly locked, and a solution is provided in the process of verifying the knocking source. Figure 13 is a flowchart of an analysis method for identifying a knocking noise source of a timing tension system based on a contact type signal provided by the embodiment of the application, and the flowchart comprises the following steps:

[0093] S01, arranging NVH and phase signal sensors, performing NVH testing, obtaining a knocking sound feature, and judging whether the knocking sound is within a preset threshold.

[0094] Further, judging whether the knocking sound is acceptable specifically comprises the following steps:

[0095] S011, arranging noise, vibration, crankshaft / camshaft, and cylinder pressure sensors on an engine and performing NVH testing;

[0096] S012, based on the test result, applying a wavelet and angle domain analysis method to obtain a knocking sound frequency, a knocking sound periodicity, and a phase moment of the knocking sound relative to engine operation, and determining that the knocking sound is from a timing tension system.

[0097] S013, based on the noise test result, judging whether the knocking sound meets a knocking feature noise signal standard requirement.

[0098] S02, pre-burying a force sensor on a dynamic rail support frame and corresponding to a position of a tensioner plunger, so as to obtain a contact force signal of the plunger and the dynamic rail. The process of obtaining the contact force of the plunger and the dynamic rail comprises the following steps:

[0099] S021, installing a force sensor on a dynamic rail support frame and corresponding to a position where the plunger contacts the dynamic rail.

[0100] S022, performing testing in a working condition where the knocking is obvious, and obtaining the contact force signal of the plunger and the dynamic rail.

[0101] S03, based on the test result of S02, judging whether the dynamic rail and the plunger are separated. If the dynamic rail and the plunger are separated, S04 is entered, and if the dynamic rail and the plunger are not separated, S05 is entered. Based on the test result of S02, it is judged whether the dynamic rail and the plunger are separated. If the contact force is equal to 0 at a certain phase, it is indicated that the dynamic rail and the plunger are separated, S04 is entered, and if the contact force is always greater than 0 in a whole cycle of a crankshaft rotation angle of 720°, it is indicated that the dynamic rail and the plunger are not separated, S05 is entered.

[0102] S04, arranging vibration sensors on a tensioner shell and a dynamic rail, so as to obtain vibration acceleration signals of the tensioner and the dynamic rail at a knocking moment. The process of obtaining the vibration signals of the tensioner / dynamic rail comprises the following steps:

[0103] S041, vibration acceleration sensors are arranged on the tensioner housing and the moving rail, and the two sensors need to be the same distance from the position where the plunger contacts the moving rail.

[0104] S042, test under the working condition where the knocking is obvious, and obtain the vibration signals of the tensioner / moving rail.

[0105] S043, based on the contact force obtained in S02, the vibration noise obtained in S01, and the vibration acceleration obtained in S042, comprehensively judge whether the knocking source is chain knocking the moving rail or the moving rail knocking the plunger.

[0106] S05, an oil pressure sensor is arranged in each of the high / low pressure cavities of the tensioner, so as to obtain real-time signals of the oil pressure in the high / low pressure cavities, and a displacement sensor is arranged on the plunger, so as to obtain the displacement signal of the plunger. The process of obtaining the high / low pressure cavity oil pressure and plunger displacement signals includes the following steps:

[0107] S051, an oil pressure sensor is arranged in each of the high / low pressure cavities of the tensioner, and a displacement sensor is arranged on the plunger.

[0108] S052, test under the working condition where the knocking is obvious, and obtain real-time signals of the high / low pressure cavity oil pressure and plunger displacement.

[0109] S06, based on the vibration acceleration signals in S04, obtain the acceleration magnitude and vibration time, so as to obtain the knocking mode of the chain, the moving rail and the plunger.

[0110] S07, based on the contact force test results in S02 and the oil pressure test results in S05, calculate the chain slack force according to a specific model, and then compare it with the standard to judge whether the chain force is normal. If it is normal, go to S09, if it is not normal, go to S10.

[0111] S08, based on the test results in S05, calculate the vacuum degree of the high / low pressure cavities under the abnormal noise working condition and the full load acceleration working condition respectively, and compare it with the standard and the industry level, so as to judge whether the vacuum degree is normal. If it is normal, go to S11, if it is not normal, go to S12.

[0112] S09, from the perspective of improving the response rate of the tensioner, the plunger can follow the moving rail in time when the chain is loose, so as to solve the knocking sound caused by the disengagement of the plunger and the moving rail. Repeat S01 to lock the knocking source. The process of improving the response rate of the tensioner includes the following steps:

[0113] S091, from the perspective of improving the response rate of the tensioner, the plunger can follow the moving rail in time when the chain is loose, so as to solve the knocking sound caused by the disengagement of the plunger and the moving rail. It can be realized by increasing the volume of the low pressure cavity, increasing the spring force, increasing the oil pressure in the low pressure cavity, etc.

[0114] S092, repeat S01 step, determine whether the knocking sound is acceptable, if acceptable, then determine that the knocking source is the plunger knocking track, or the chain knocking track, or both.

[0115] S10, reduce the excitation of the crankshaft system and the camshaft system to the chain, reduce the fluctuation of the chain, so that it does not separate from the plunger. Repeat S01, so as to lock the knocking source. The process of reducing the excitation includes the following steps:

[0116] S101, from the perspective of reducing the excitation of the crankshaft system and the camshaft system to the chain system, the fluctuation of the chain is reduced, and the tensioner plunger can always follow the fluctuation of the track, thereby solving the knocking sound caused by the separation of the plunger and the track. It can be realized by reducing the valve spring force, optimizing the camshaft profile, reducing the crankshaft torsional vibration, etc.

[0117] S102, repeat S01 step, determine whether the knocking sound is acceptable, if acceptable, then determine that the knocking source is the plunger knocking track, or the chain knocking track, or both.

[0118] S11, in the case that all parameters are normal, the abnormal sound source is likely to be the tensioner itself, then check the snap spring, plunger size, etc. whether it meets the design requirements, replace qualified parts, and repeat S01, so as to lock the knocking source. The process of improving the consistency of the tensioner includes the following steps:

[0119] S111, accurately measure the snap spring, plunger size, shell size, and tensioner leakage, etc. to determine which component does not meet the design requirements.

[0120] S112, replace qualified parts, repeat S01 step, determine whether the knocking sound is acceptable, if acceptable, then determine that the knocking source is the unqualified parts of the tensioner body.

[0121] S12, if the high / low pressure cavity vacuum degree is not normal, then reduce the high / low pressure cavity vacuum degree, and repeat S01, so as to lock the knocking source. The process of reducing the high / low pressure cavity vacuum degree includes the following steps:

[0122] S121, from the perspective of reducing the vacuum degree of the high / low pressure cavity, improve the oil supplementing capacity of the high pressure cavity, so that the tensioner is more "stiff", and the plunger always follows the fluctuation of the track, thereby solving the knocking sound caused by the separation of the plunger and the track. It can be realized by improving the oil supplementing capacity of the low pressure cavity, reducing the leakage of the high pressure cavity, improving the oil discharge pressure of the high pressure cavity, etc.

[0123] S122, repeat S01 step, determine whether the knocking sound is acceptable, if acceptable, then determine that the knocking source is the sudden change of force caused by the compression of air and oil by the plunger.

[0124] The system and method for quickly identifying the knocking noise source of the timing tensioning system based on the contact type signal has the beneficial effects that: the contact type vibration signal is associated with the noise signal, the wavelet analysis method is applied, and the noise source is quickly narrowed to the timing tensioning system; the contact type force sensor is installed on the moving rail to determine whether the moving rail and the plunger are separated, and the knocking source range is further narrowed; the plunger knocking the moving rail or the chain knocking the moving rail is distinguished by combining the tensioner / moving rail vibration acceleration signal time; it is distinguished whether the noise source is the body part or the metal impact liquid by punching on the high / low pressure cavity of the tensioner and measuring the real-time oil pressure and calculating the vacuum degree. In the process of continuously narrowing the knocking source range, not only the knocking source can be locked, but also the knocking mechanism can be clarified and an optimization scheme can be developed. The knocking source is locked by only one NVH test through the contact type vibration acceleration, force and oil pressure signals, the problems of difficult test and troubleshooting of rotation, lubricating oil and internal parts are solved, the problem locking and optimization are quickly realized, and the method has strong engineering significance.

[0125] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and the necessary general hardware platform, and of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server, or network device) execute the method described in each embodiment of the present application.

[0126] Embodiment 2

[0127] In this embodiment, a vehicle noise source identification device is also provided, which is used to implement the above embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware is also possible and contemplated.

[0128] Figure 14 is a structural block diagram of a vehicle noise source identification device according to an embodiment of the present application, as shown in Figure 14 , the device comprises:

[0129] The first acquisition module 140 is configured to acquire a noise characteristic parameter of the knocking sound of the timing tensioner, wherein the timing tensioner comprises a plunger, a moving rail, a chain, and an oil cavity.

[0130] determining whether the noise characteristic parameter is greater than a preset threshold value;

[0131] the second acquisition module 144 is configured to acquire a contact force signal of the plunger and the moving rail if the noise characteristic parameter is greater than the preset threshold value;

[0132] the positioning module 146 is configured to position a noise source of the knocking sound according to the contact force signal.

[0133] Optionally, the positioning module includes: an acquisition unit configured to acquire an oil pressure signal of an oil chamber, acquire vibration acceleration signals of the timing tensioner and the moving rail at a knocking moment respectively, and acquire a displacement signal of the plunger; a first judgment unit configured to judge whether the plunger and the moving rail are separated according to the contact force signal; and a first positioning unit configured to position the noise source of the knocking sound according to the vibration acceleration signals and the oil pressure signal if the plunger and the moving rail are separated, and position the noise source of the knocking sound according to the oil pressure signal and the displacement signal if the plunger and the moving rail are not separated.

[0134] Optionally, the first positioning unit includes: an identification subunit configured to identify a knocking mode of the knocking sound according to the vibration acceleration signals, wherein the knocking mode includes plunger-knocking-moving-rail and chain-knocking-moving-rail; and a positioning subunit configured to position the noise source of the knocking sound according to the knocking mode and the oil pressure signal.

[0135] Optionally, the identification subunit is further configured to: receive and identify a first vibration acceleration signal of the timing tensioner, and receive a second vibration acceleration signal of the moving rail; record a first receiving moment of the first vibration acceleration signal, and record a second receiving moment of the second vibration acceleration signal; identify the knocking mode of the knocking sound as plunger-knocking-moving-rail if the first receiving moment is earlier than the second receiving moment; and identify the knocking mode of the knocking sound as chain-knocking-moving-rail if the first receiving moment is later than the second receiving moment.

[0136] Optionally, the positioning subunit is further configured to: calculate a chain slack force based on the oil pressure signal; judge whether the chain slack force meets a first preset condition; position the noise source of the knocking sound as the plunger and the moving rail being separated if the chain force meets the first preset condition and the knocking mode of the knocking sound is plunger-knocking-moving-rail; and position the noise source of the knocking sound as the chain and the plunger being separated if the chain force does not meet the first preset condition and the knocking mode of the knocking sound is chain-knocking-moving-rail.

[0137] Optionally, the positioning module is further configured to: increase the angle of the response rate of the timing tensioner after locating the noise source of the knocking sound as the disengagement of the plunger from the moving rail; or decrease the excitation of the chain by the crankshaft system and / or the camshaft system after locating the noise source of the knocking sound as the disengagement of the chain from the plunger.

[0138] Optionally, the positioning module comprises: a calculation unit configured to calculate the vacuum degree of the oil cavity according to the oil pressure signal and the displacement signal; a second judgment unit configured to judge whether the vacuum degree meets a second preset condition; and a second positioning unit configured to locate the noise source of the knocking sound as a component size defect of the timing tensioner if the vacuum degree meets the second preset condition, or locate the noise source of the knocking sound as an abnormal vacuum degree of the oil cavity if the vacuum degree does not meet the second preset condition.

[0139] Optionally, the positioning module is further configured to: prompt replacement of the timing tensioner after locating the noise source of the knocking sound as the component size defect of the timing tensioner; or reduce the vacuum degree of the oil cavity after locating the noise source of the knocking sound as the abnormal vacuum degree of the oil cavity.

[0140] Optionally, the obtaining unit comprises: an acquisition subunit configured to acquire a first vibration acceleration signal of a first vibration acceleration sensor and a second vibration acceleration signal of a second vibration acceleration sensor, wherein the first vibration acceleration sensor is arranged on a tensioner housing of the timing tensioner, the second vibration acceleration sensor is arranged on the moving rail, and the first vibration acceleration sensor and the second vibration acceleration sensor are the same distance from the contact position of the plunger and the moving rail.

[0141] It should be noted that the above various modules can be implemented by software or hardware, and for the latter, the following implementation manners can be used, but are not limited thereto: all the above modules are located in the same processor; or the above various modules are located in different processors in any combination.

[0142] Embodiment 3

[0143] The embodiments of the present application also provide a storage medium having a computer program stored therein, wherein the computer program is configured to execute the steps in any of the method embodiments when running.

[0144] Optionally, in the present embodiment, the above storage medium can be configured to store a computer program for executing the following steps:

[0145] S1, obtaining a noise characteristic parameter of a knocking sound of a timing tensioner, wherein the timing tensioner comprises a plunger, a moving rail, a chain, and an oil cavity;

[0146] S2, judging whether the noise characteristic parameter is greater than a preset threshold value;

[0147] S3, if the noise characteristic parameter is greater than the preset threshold value, acquiring a contact force signal of the plunger and the moving rail;

[0148] S4, positioning a noise source of the knocking sound according to the contact force signal.

[0149] Optionally, in the embodiment, the storage medium can include but is not limited to a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk and various computer program storage media.

[0150] The embodiment of the application further provides an electronic device including a memory and a processor, the memory stores a computer program, and the processor is configured to run the computer program to execute the steps in any of the method embodiments.

[0151] Optionally, the electronic device can further include a transmission device and an input and output device, wherein the transmission device is connected with the processor, and the input and output device is connected with the processor.

[0152] Optionally, in the embodiment, the processor can be configured to execute the following steps through the computer program:

[0153] S1, acquiring a noise characteristic parameter of a knocking sound of a timing tensioner, wherein the timing tensioner includes a plunger, a moving rail, a chain and an oil cavity;

[0154] S2, judging whether the noise characteristic parameter is greater than a preset threshold value;

[0155] S3, if the noise characteristic parameter is greater than the preset threshold value, acquiring a contact force signal of the plunger and the moving rail;

[0156] S4, positioning a noise source of the knocking sound according to the contact force signal.

[0157] Optionally, specific examples in the embodiment can refer to the examples described in the above embodiments and optional implementation manners, and the embodiment will not be described here.

[0158] The serial numbers of the above embodiments of the application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0159] In the above-described embodiments of the present application, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0160] In several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other ways. Among them, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division way, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or modules shown or discussed can be indirect coupling or communication connection through some interfaces, units or modules, which can be electrical or other forms.

[0161] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place or distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0162] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The above integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0163] The integrated unit, if realized in the form of software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part of the prior art that makes a contribution or the whole or part of the technical solutions can be embodied in the form of software product, which is stored in a storage medium and includes a plurality of instructions for making a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic or optical disk and various program code storage media.

[0164] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A method for identifying vehicle noise sources, characterized in that, include: Obtain noise characteristic parameters of the knocking sound of the timing tensioner, wherein the timing tensioner includes a plunger, a moving rail, a chain, and an oil chamber; Determine whether the noise characteristic parameter is greater than a preset threshold; If the noise characteristic parameter is greater than a preset threshold, the contact force signal between the plunger and the moving rail is obtained; The source of the knocking sound is located based on the contact force signal; The method of locating the noise source of the knocking sound based on the contact force signal includes: acquiring the oil pressure signal of the oil chamber, acquiring the vibration acceleration signals of the timing tensioner and the moving rail at the moment of knocking, and acquiring the displacement signal of the plunger; determining whether the plunger has disengaged from the moving rail based on the contact force signal; if the plunger has disengaged from the moving rail, locating the noise source of the knocking sound based on the vibration acceleration signal and the oil pressure signal; if the plunger has not disengaged from the moving rail, locating the noise source of the knocking sound based on the oil pressure signal and the displacement signal. The method of locating the noise source of the knocking sound based on the vibration acceleration signal and the oil pressure signal includes: identifying the knocking pattern of the knocking sound based on the vibration acceleration signal, wherein the knocking pattern includes: plunger knocking the moving rail and chain knocking the moving rail; and locating the noise source of the knocking sound based on the knocking pattern and the oil pressure signal. The method of locating the noise source of the knocking sound based on the knocking pattern and the hydraulic pressure signal includes: calculating the slack force of the chain based on the hydraulic pressure signal; determining whether the slack force of the chain meets a first preset condition; if the slack force of the chain meets the first preset condition, and the knocking pattern of the knocking sound is a plunger knocking against the moving rail, the noise source of the knocking sound is located as the plunger disengaging from the moving rail; if the slack force of the chain does not meet the first preset condition, and the knocking pattern of the knocking sound is a chain knocking against the moving rail, the noise source of the knocking sound is located as the chain disengaging from the plunger. The method of locating the noise source of the knocking sound based on the oil pressure signal and the displacement signal includes: calculating the vacuum degree of the oil chamber based on the oil pressure signal and the displacement signal; determining whether the vacuum degree meets a second preset condition; if the vacuum degree meets the second preset condition, locating the noise source of the knocking sound as a component size defect of the timing tensioner; if the vacuum degree does not meet the second preset condition, locating the noise source of the knocking sound as an abnormal vacuum degree of the oil chamber.

2. The method according to claim 1, characterized in that, Identifying the striking pattern of the striking sound based on the vibration acceleration signal includes: Receive and identify the first vibration acceleration signal of the timing tensioner, and receive the second vibration acceleration signal of the moving rail; Record the first reception time of the first vibration acceleration signal and the second reception time of the second vibration acceleration signal; If the first receiving time is earlier than the second receiving time, the knocking pattern of the knocking sound is identified as a plunger knocking on the moving rail; if the first receiving time is later than the second receiving time, the knocking pattern of the knocking sound is identified as a chain knocking on the moving rail.

3. The method according to claim 1, characterized in that, The method further includes: After identifying the source of the knocking noise as the disengagement of the plunger from the moving rail, increase the angle of the timing tensioner response rate; or, after identifying the source of the knocking noise as the disengagement of the chain from the plunger, reduce the excitation of the chain by the crankshaft system and / or camshaft system.

4. The method according to claim 1, characterized in that, The method further includes: After identifying the source of the knocking noise as a dimensional defect in the timing tensioner, the system prompts the system to replace the part; or, after identifying the source of the knocking noise as an abnormal vacuum in the oil chamber, the system reduces the vacuum in the oil chamber.

5. The method according to claim 1, characterized in that, Acquiring the vibration acceleration signals of the timing tensioner and the moving rail at the moment of impact includes: The system acquires a first vibration acceleration signal from a first vibration acceleration sensor and a second vibration acceleration signal from a second vibration acceleration sensor. The first vibration acceleration sensor is disposed in the tensioner housing of the timing tensioner, and the second vibration acceleration sensor is disposed on the moving rail. The distances of the first and second vibration acceleration sensors from the contact position between the plunger and the moving rail are the same.

6. A device for identifying vehicle noise sources, characterized in that, include: The first acquisition module is used to acquire the noise characteristic parameters of the knocking sound of the timing tensioner, wherein the timing tensioner includes a plunger, a moving rail, a chain, and an oil chamber; The judgment module is used to determine whether the noise feature parameters are greater than a preset threshold. The second acquisition module is used to acquire the contact force signal between the plunger and the moving rail if the noise characteristic parameter is greater than a preset threshold. A positioning module is used to locate the noise source of the knocking sound based on the contact force signal; The positioning module includes: an acquisition unit for acquiring the oil pressure signal of the oil chamber, acquiring the vibration acceleration signals of the timing tensioner and the moving rail at the moment of impact, and acquiring the displacement signal of the plunger; a first judgment unit for determining whether the plunger has disengaged from the moving rail based on the contact force signal; and a first positioning unit for locating the noise source of the impact sound based on the vibration acceleration signal and the oil pressure signal if the plunger has disengaged from the moving rail, and locating the noise source of the impact sound based on the oil pressure signal and the displacement signal if the plunger has not disengaged from the moving rail. The first positioning unit includes: an identification subunit, used to identify the knocking pattern of the knocking sound based on the vibration acceleration signal, wherein the knocking pattern includes: a plunger knocking the moving rail and a chain knocking the moving rail; and a positioning subunit, used to locate the noise source of the knocking sound based on the knocking pattern and the hydraulic pressure signal. The positioning subunit is further configured to: calculate the slack force of the chain based on the hydraulic signal; determine whether the slack force of the chain meets a first preset condition; if the slack force of the chain meets the first preset condition, and the knocking sound is a piston knocking the moving rail, locate the noise source of the knocking sound as the piston disengaging from the moving rail; if the slack force of the chain does not meet the first preset condition, and the knocking sound is a chain knocking the moving rail, locate the noise source of the knocking sound as the chain disengaging from the piston. The positioning module further includes: a calculation unit for calculating the vacuum level of the oil chamber based on the oil pressure signal and the displacement signal; a second judgment unit for judging whether the vacuum level meets a second preset condition; and a second positioning unit for locating the noise source of the knocking sound as a component size defect of the timing tensioner if the vacuum level meets the second preset condition, and locating the noise source of the knocking sound as an abnormal vacuum level in the oil chamber if the vacuum level does not meet the second preset condition.

7. A storage medium, characterized in that, The storage medium stores a computer program, wherein the computer program is configured to execute the method described in any one of claims 1 to 5 when it is run.

8. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to run the computer program to perform the method as described in any one of claims 1 to 5.

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