Valve clearance monitoring method, device and system and electronic equipment
By monitoring the difference between the first and second closing phases of the valves and using a sensor system to detect abnormal valve clearance in real time, the problem of engine performance degradation caused by valve wear was solved, and the stability and reliability of engine performance were improved.
Patent Information
- Application Number
- CN202511260069.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-04
- Publication Date
- 2025-10-31
AI Technical Summary
As engine operating time increases, valve clearance wear leads to changes in valve closing phase, affecting engine power and combustion economy. Existing technologies make it difficult to detect and adjust valve clearance in a timely manner.
By acquiring the first valve closing phase and engine vibration signal, the second valve closing phase is determined, and the difference between the two is compared to determine whether the valve clearance is abnormal. Real-time monitoring is achieved using a knock sensor, crankshaft phase sensor, and camshaft phase sensor.
It enables timely identification and adjustment of valve clearance, avoiding problems such as reduced engine power and improving the stability and reliability of engine performance.
Smart Images
Figure CN120869615A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engine technology, and in particular to a valve clearance monitoring method, device, system and electronic equipment. Background Technology
[0002] As engine operating time increases, wear will occur between the valve bridge and valve stem, and between the valve and valve seat. As wear intensifies, valve clearance changes, leading to alterations in valve closing phase. This change results in decreased engine power, reduced combustion economy, and worsened emissions. Therefore, timely detection and adjustment of valve clearance to restore the original valve timing is crucial. Summary of the Invention
[0003] In view of the above problems, this application provides a valve clearance monitoring method, device, system, and electronic device to achieve the purpose of timely detection of valve clearance abnormalities. The specific solution is as follows:
[0004] The first aspect of this application provides a valve clearance monitoring method, comprising:
[0005] The first closing phase of each valve is obtained. The first closing phase of each valve is determined according to the firing order of each cylinder of the engine and the closing phase of each target valve corresponding to the target cylinder. The target cylinder is the first cylinder to be ignited.
[0006] For each valve, an engine vibration signal within a target time interval is acquired, wherein the target time interval is the time period corresponding to the target phase interval, and the target phase interval is the phase interval determined based on the first closing phase corresponding to the valve;
[0007] For each valve, the second closing phase of the valve is determined based on the engine vibration signal corresponding to the valve;
[0008] For each valve, the presence or absence of an abnormality in the valve clearance is determined by comparing the first closing phase and the second closing phase corresponding to the valve.
[0009] In one possible implementation, the process of determining the first closing phase of each valve includes:
[0010] Obtain the top dead center phase corresponding to the compression top dead center of the target cylinder;
[0011] For each target valve, the closing phase of the target valve is obtained based on the initial closing phase and the top dead center phase corresponding to the target valve;
[0012] The first closing phase of each valve is determined based on the closing phase of each target valve and the firing order of each cylinder.
[0013] In one possible implementation, obtaining the top dead center phase corresponding to the compression top dead center of the target cylinder includes:
[0014] Based on the signals from the crankshaft phase sensor and the camshaft phase sensor, the top dead center phase corresponding to the compression top dead center of the target cylinder is determined.
[0015] In one possible implementation, determining the second closing phase of the valve based on the engine vibration signal corresponding to the valve includes:
[0016] The phase corresponding to the maximum vibration amplitude in the engine vibration signal is determined as the second shut-off phase.
[0017] In one possible implementation, for each valve, a comparison between the first closing phase and the second closing phase corresponding to the valve is used to determine whether there is an abnormality in the valve clearance, including:
[0018] For each valve, if the second closing phase corresponding to the valve is within the restriction range, then it is determined that there is no abnormality in the valve clearance, and the restriction range is the range determined with the first closing phase as the midpoint;
[0019] If the second closing phase corresponding to the valve exceeds the limit range, it is determined that there is an abnormality in the valve clearance.
[0020] In one possible implementation, if the second closing phase corresponding to the valve exceeds the limit range, then it is determined that the valve clearance is abnormal, including:
[0021] If the second closing phase is less than the minimum value of the restricted range, then wear is determined to exist in the valve bridge and the valve stem;
[0022] If the second closing phase is greater than the maximum value of the restriction range, then it is determined that there is wear on the valve and valve seat.
[0023] In one possible implementation, the process of determining the target phase interval corresponding to each valve includes:
[0024] For each valve, the first closing phase corresponding to the valve is taken as the midpoint of the interval, and the phase interval is obtained by extending a preset phase from the midpoint to both ends.
[0025] A second aspect of this application provides a valve clearance monitoring device, comprising:
[0026] The theoretical closing phase determination module is used to obtain the first closing phase of each valve. The first closing phase of each valve is determined based on the firing order of each cylinder of the engine and the closing phase of each target valve corresponding to the target cylinder. The target cylinder is the first cylinder to be ignited.
[0027] The vibration signal acquisition module is used to acquire engine vibration signals within a target time interval for each valve, wherein the target time interval is the time interval corresponding to the target phase interval, and the target phase interval is the phase interval determined according to the first closing phase corresponding to the valve.
[0028] The actual closing phase determination module is used to determine, for each valve, the second closing phase of the valve based on the engine vibration signal corresponding to the valve; and,
[0029] The valve clearance abnormality determination module is used to determine whether there is an abnormality in the valve clearance for each valve based on the comparison result between the first closing phase and the second closing phase corresponding to the valve.
[0030] A third aspect of this application provides a valve clearance monitoring system, comprising: an electronic control unit and a knock sensor, a crankshaft phase sensor, and a camshaft phase sensor respectively connected to the electronic control unit, wherein the knock sensor is used to acquire vibration signals of the engine, the crankshaft phase sensor and the camshaft phase sensor are used to determine the closing phase of each target valve corresponding to the target cylinder, and the electronic control unit is used to execute the valve clearance monitoring method of the first aspect or any implementation thereof.
[0031] The fourth aspect of this application provides a computer program product including computer-readable instructions that, when executed on an electronic device, cause the electronic device to implement the valve clearance monitoring method of the first aspect or any implementation thereof.
[0032] A fifth aspect of this application provides an electronic device, comprising at least one processor and a memory connected to the processor, wherein:
[0033] The memory is used to store computer programs;
[0034] The processor is used to execute the computer program so that the electronic device can implement the valve clearance monitoring method of the first aspect or any implementation thereof.
[0035] The sixth aspect of this application provides a computer storage medium carrying one or more computer programs, which, when executed by an electronic device, enable the electronic device to implement the valve clearance monitoring method described in the first aspect or any implementation thereof.
[0036] By employing the above technical solution, the valve clearance monitoring method provided in this application determines the first closing phase, i.e., the theoretical closing phase, of each valve based on the firing order of each cylinder of the engine and the closing phase of each target valve corresponding to the target cylinder. Based on this, the engine vibration signal within the phase interval determined by the first closing phase of each valve is acquired, and the second closing phase, i.e., the actual closing phase, of the valve is determined based on the engine vibration signal corresponding to the valve. For each valve, the first closing phase and the second closing phase are compared to obtain comparison result data, and based on this comparison result data, it is determined whether there is an abnormality in the valve clearance. This valve clearance monitoring method, by detecting the actual closing phase of the valve and comparing it with the theoretical closing phase, can promptly identify situations where the difference between the actual and theoretical closing phases increases due to abnormal valve clearance, thereby reminding the user to adjust the valve clearance in a timely manner and minimizing the occurrence of problems such as decreased engine power. Attached Figure Description
[0037] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.
[0038] Figure 1 A flowchart of a valve clearance monitoring method provided in this application;
[0039] Figure 2 A cylinder head vibration signal diagram acquired by a knock sensor provided in this application;
[0040] Figure 3 Vibration signal diagram of the actual valve closing phase provided in this application;
[0041] Figure 4 The vibration amplitude diagram of the actual closed phase provided in this application;
[0042] Figure 5 A diagram illustrating the change in valve clearance during valve formation, provided for this application;
[0043] Figure 6 A schematic diagram of the restricted area provided in this application;
[0044] Figure 7 A schematic diagram for determining the top dead center provided in this application;
[0045] Figure 8 Another flowchart of the valve clearance monitoring method provided in this application;
[0046] Figure 9 A structural diagram of a valve clearance monitoring device provided in this application;
[0047] Figure 10 A structural diagram of a valve clearance monitoring system provided in this application;
[0048] Figure 11 This is a structural diagram of an electronic device provided in this application. Detailed Implementation
[0049] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.
[0050] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.
[0051] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.
[0052] Explanation of relevant terms:
[0053] Valve timing: The opening and closing phases of the engine's intake and exhaust valves. Valve timing should be within the design specifications; otherwise, engine economy, power, and emissions will deteriorate.
[0054] Valve clearance: When the rocker arm cam corresponds to the base circle of the camshaft, there is a certain clearance between them. The valve clearance should be adjusted according to the specified design value.
[0055] Angle domain: By providing a time reference point, a signal that originally varies with time can be transformed into a signal that varies with angle.
[0056] Top Dead Center (TDC): The position where the piston reaches its highest point within the cylinder is called top dead center. The compression process is called compression TDC, and the exhaust process is called exhaust TDC.
[0057] To address the aforementioned problems, this application provides a valve clearance monitoring method. The valve clearance monitoring method of this application embodiment will be described in detail below with reference to the accompanying drawings.
[0058] Reference Figure 1 , Figure 1 This application provides a flowchart illustrating a valve clearance monitoring method as shown in the embodiments. Figure 1 As shown in the embodiment of this application, a valve clearance monitoring method may include steps 101 to 104, which are described in detail below.
[0059] 101. Obtain the first closing phase of each valve. The first closing phase of each valve is determined based on the firing order of each cylinder of the engine and the closing phase of each target valve corresponding to the target cylinder. The target cylinder is the first cylinder to be ignited.
[0060] In one embodiment, whether for a gas turbine engine or a gasoline engine, the valves used include intake valves and exhaust valves. Each cylinder corresponds to one intake valve and one exhaust valve. During engine operation, the valves in each cylinder operate as follows:
[0061] Intake process: During the intake stroke of the engine, the intake valve opens and the exhaust valve closes. The piston moves downward, drawing in a mixture of air and fuel into the cylinder.
[0062] Compression process: During the compression stroke, both the intake and exhaust valves are closed, the piston moves upward, compresses the air-fuel mixture, and increases its temperature and pressure in preparation for combustion.
[0063] Power stroke: During the power stroke, the spark plug generates an electric spark that ignites the gas-fuel mixture. The combustion of the mixture produces high temperature and pressure, which pushes the piston downward, thereby driving the crankshaft to rotate and generate power.
[0064] Exhaust process: During the exhaust stroke, the exhaust valve opens, the intake valve closes, and the piston moves upward, expelling the exhaust gases from the cylinder.
[0065] It can be seen that during the complete power stroke of a cylinder, both the exhaust valve and the intake valve open and close once. The closing phase of each valve can be determined based on the firing order of each cylinder and the valve closing phase of the first fired cylinder.
[0066] For example, taking a four-cylinder engine as an example, the firing order of the engine cylinders is 1-3-4-2. According to this firing order, the top dead center of cylinder 1 is taken as the zero point. According to the engine valve timing design, the closing phase of the intake valve of cylinder 1 is a1, and the closing phase of the exhaust valve is b1. The closing phase of each valve in one working cycle of the engine can be referred to in the table below:
[0067]
[0068] It is understandable that the valve closing phases mentioned above can be adjusted according to different engine types and the number of cylinders, and no restrictions are imposed here.
[0069] 102. For each valve, acquire the engine vibration signal within the target time interval. The target time interval is the time period corresponding to the target phase interval, and the target phase interval is the phase interval determined according to the first closing phase of the valve.
[0070] In one embodiment, vibration signals in the engine can be measured using knock sensors. Knock sensors are typically located on the upper edge of the engine block or on the cylinder block, and there are usually two of them. They are used to detect engine knock energy. One of the knock sensors can be used to collect valve seat vibration signals. For example, see [reference needed]. Figure 2 The vibration signal collected by the knock sensor is due to the impact between the valve and the valve seat when the valve is closed, resulting in a high-amplitude vibration. Therefore, the valve closing phase can be identified by analyzing the vibration signal collected by the knock sensor.
[0071] Since the vibration signal is continuously acquired in the time domain, and the valve closing phase is a signal that varies with angle, and the angle change is also caused by rotation in the time domain, the phase interval within the angle before and after the first closing phase can be taken as the target phase interval, and the target time interval corresponding to the target phase interval can be taken as the acquisition interval of the vibration signal. Vibration signals can then be acquired within this target time interval.
[0072] Because the change in valve clearance causes a change in the valve closing phase, this change may be larger or smaller than the theoretical closing phase. Therefore, vibration signals can be collected within a phase interval of 15 degrees before and after the first closing phase.
[0073] It is understood that those skilled in the art can adjust the size of the target phase interval as needed, which will not be elaborated here.
[0074] 103. For each valve, determine the second closing phase of the outlet valve based on the engine vibration signal corresponding to the valve.
[0075] Specifically, the phase corresponding to the maximum vibration amplitude in the engine vibration signal can be determined as the second shut-off phase. For example, refer to... Figure 3 As shown, the vibration signals of the valves in each cylinder were collected. Among two adjacent maximum values, the one with the smaller phase is the intake valve, and the one with the larger phase is the exhaust valve. (Refer to...) Figure 4 As shown, within the 30-degree angle range of 511-541, the maximum value is at 526 degrees. Therefore, 526 degrees can be taken as the second closing phase, that is, the actual closing phase of the valve.
[0076] 104. For each valve, determine whether there is an abnormality in the valve clearance by comparing the first closing phase and the second closing phase corresponding to the valve.
[0077] Specifically, considering the consistency of engine performance, the actual valve seating phase (i.e., valve closing phase) should be allowed to fluctuate within a certain range. Only when it exceeds this range will the engine performance change significantly. Therefore, when the difference between the first and second valve closing phases is within the limit, the valve clearance is considered normal. Conversely, when the difference between the first and second valve closing phases exceeds this limit, an abnormality is identified. In this case, a corresponding alarm message can be sent to the user, allowing them to adjust the valve clearance promptly and minimize the risk of engine power loss.
[0078] This valve clearance monitoring method enables real-time detection and diagnosis of the gas engine's valve timing. When the valve timing exceeds the specified range, it reminds the user to adjust the valve clearance in a timely manner to avoid the aforementioned problems.
[0079] In another embodiment, to accurately determine the theoretical closing phase of the valves during engine operation and ensure the accuracy of subsequent valve clearance anomaly detection, the process for determining the first closing phase of each valve in the above embodiment includes:
[0080] 201. Obtain the top dead center phase corresponding to the compression top dead center of the target cylinder.
[0081] Specifically, taking the aforementioned four-cylinder engine as an example, firstly, based on the signals from the crankshaft phase sensor and the camshaft phase sensor, the top dead center phase corresponding to the compression top dead center of the target cylinder (i.e., cylinder 1) is determined. After determining the compression top dead center phase, the theoretical closing phases of the intake and exhaust valves of cylinder 1 are determined according to the engine valve timing design.
[0082] Reference Figure 7 As shown, the top dead center (TDC) can be detected using a flywheel speed sensor and a camshaft speed sensor. The left side illustrates the detection principle of the camshaft speed sensor, and the right side illustrates the detection principle of the flywheel speed sensor. The flywheel is divided into 60 equal parts along its circumference, but it only has 58 teeth, so two sections are toothless. The flywheel speed sensor can identify these positions. The camshaft has 5 teeth, with 4 teeth spaced 90 degrees apart and the fifth tooth spaced 15 degrees from one of the teeth. The camshaft speed sensor can identify this position. By determining these two positions, the ignition TDC angle is determined, thus determining the TDC. Determining TDC is a coordinated process of the flywheel angle signal and the camshaft angle signal, mainly involving the flywheel angle returning to zero and the camshaft phase synchronization.
[0083] When the flywheel rotates, the sensor detects the position without teeth, which is the moment when the piston reaches the top of the cylinder and the valve begins to close / open.
[0084] When the camshaft sensor detects the reference tooth of the camshaft, it outputs a signal to the ECU. The ECU confirms the phase match between the camshaft and the flywheel through the camshaft rotation angle signal (e.g., the top dead center of the camshaft corresponds to the top dead center of the flywheel).
[0085] 202. For each target valve, the closing phase of the target valve is obtained based on the initial closing phase and the top dead center phase corresponding to the target valve.
[0086] For example, when the phase of the top dead center of cylinder 1 is determined to be 0, the intake valve closing angle is a1 and the exhaust valve closing angle is b1. When the phase of the top dead center of cylinder 1 is not 0, but a specific angle value c greater than 0, the intake valve closing angle is a1+c and the exhaust valve closing angle is b1+c.
[0087] 203. Determine the first closing phase of each valve based on the closing phase of each target valve and the firing order of each cylinder.
[0088] Based on the determination of the closing phase of the intake valve and the closing phase of the exhaust valve of cylinder 1, the theoretical closing phases of the intake valve and the exhaust valve of other cylinders can be determined according to the rules shown in the table above.
[0089] In some embodiments, to facilitate subsequent targeted adjustments by users to abnormal valve clearance and improve adjustment efficiency, step 104 above, for each valve, determines whether there is an abnormality in the valve clearance based on the comparison result of the first closing phase and the second closing phase corresponding to the valve, including:
[0090] For each valve, if the second closing phase corresponding to the valve is within the restricted range, then the valve clearance is determined to be normal. The restricted range is defined by the first closing phase as the midpoint. If the second closing phase corresponding to the valve exceeds the restricted range, then the valve clearance is determined to be abnormal.
[0091] Specifically, changes in engine valve timing are usually caused by wear between the valve bridge and valve stem, or between the valve and valve seat. Wear in the former leads to increased valve clearance, while wear in the latter leads to decreased valve clearance. These changes in valve clearance result in changes in valve timing. (Refer to...) Figure 5 As shown, the larger the valve clearance, the smaller the valve seating phase; conversely, the smaller the valve clearance, the larger the valve seating phase. Based on this pattern, the cause of abnormal valve timing can be identified. Specifically, if the second closing phase is less than the minimum value of the limit range, it indicates wear on the valve bridge and valve seat. If the second closing phase is greater than the maximum value of the limit range, it indicates wear on the valve and valve seat.
[0092] As a possible implementation of the above embodiments, refer to Figure 6 As shown, the valve closing phase is limited to between phases 548 and 552. If the actual closing phase falls within this limited range, the valve clearance is confirmed to be normal. However, if the actual closing phase is less than the minimum value of this limited range, such as... Figure 6 If a valve closing phase is detected at phase 545, it indicates an abnormal valve clearance caused by wear on the valve bridge and valve stem, requiring targeted adjustments to the valve bridge and valve stem. When the actual closing phase exceeds the maximum value of this limit range, such as... Figure 6 If the valve closing phase is detected at phase 553, it indicates that the abnormal valve clearance is caused by wear of the valve and valve seat, and targeted adjustments to the valve and valve seat are required.
[0093] In other embodiments, to obtain the actual closing phase of each valve more accurately, the process of determining the target phase interval corresponding to each valve may specifically include:
[0094] For each valve, the first closing phase corresponding to the valve is taken as the midpoint of the interval, and a preset phase is extended from the midpoint to both ends to obtain the phase interval.
[0095] For example, as shown in Figure 3, the vibration signal of a four-cylinder engine is shown. At phase 164.98, the intake valve of cylinder 3 is closed, and at phase 188.08, the exhaust valve is closed. There is a difference of about 22 degrees between the two closed phases. Therefore, the maximum vibration amplitude can be detected within a range of 15 degrees before and after each closed phase, thereby determining the actual closed phase.
[0096] It is understood that those skilled in the art can adjust the range of the above-mentioned target phase interval as needed, which will not be elaborated here.
[0097] As a specific application of the above-mentioned valve clearance monitoring method, refer to Figure 8 As shown, the valve clearance monitoring method may specifically include the following processing steps:
[0098] After the engine starts running, the electronic control unit collects data from the knock sensor, crankshaft phase sensor, and camshaft phase sensor in real time. Based on the data from the crankshaft phase sensor and camshaft phase sensor, the phase of the compression top dead center is determined, and based on this, the first closing phase of each valve is determined.
[0099] Based on the first shut-off phase, knock sensor data within a certain angular range of the first shut-off phase is extracted, and the phase corresponding to the maximum amplitude is determined as the second shut-off phase. Detection ends when the second shut-off phase is within the restricted range. Otherwise, a corresponding alarm message is issued before detection ends.
[0100] The above describes a valve clearance monitoring method provided by the embodiments of this application. The following will describe the apparatus for performing the above valve clearance monitoring method.
[0101] Please see Figure 9 , Figure 9 This is a schematic diagram of a valve clearance monitoring device provided in an embodiment of this application. Figure 9 As shown, the valve clearance monitoring device includes:
[0102] The theoretical closing phase determination module 901 is used to obtain the first closing phase of each valve. The first closing phase of each valve is determined based on the firing order of each cylinder of the engine and the closing phase of each target valve corresponding to the target cylinder. The target cylinder is the first cylinder to be ignited.
[0103] The vibration signal acquisition module 902 is used to acquire the engine vibration signal within a target time interval for each valve. The target time interval is the time period corresponding to the target phase interval, and the target phase interval is the phase interval determined according to the first closing phase of the valve.
[0104] The actual closing phase determination module 903 is used to determine the second closing phase of each valve based on the engine vibration signal corresponding to that valve; and,
[0105] The valve clearance abnormality determination module 904 is used to determine whether there is an abnormality in the valve clearance for each valve based on the comparison result of the first closing phase and the second closing phase corresponding to the valve.
[0106] In one possible implementation, the process of determining the first closing phase of each valve in the theoretical closing phase determination module 901 includes:
[0107] Obtain the top dead center phase corresponding to the compression top dead center of the target cylinder;
[0108] For each target valve, the closing phase of the target valve is obtained based on the initial closing phase and the top dead center phase corresponding to the target valve;
[0109] The first closing phase of each valve is determined based on the closing phase of each target valve and the firing order of each cylinder.
[0110] In one possible implementation, the theoretically closed phase determination module 901 obtains the top dead center phase corresponding to the compression top dead center of the target cylinder, including:
[0111] Based on the signals from the crankshaft phase sensor and the camshaft phase sensor, the top dead center phase corresponding to the compression top dead center of the target cylinder is determined.
[0112] In one possible implementation, the actual closing phase determination module 903 determines the second closing phase of the outlet valve based on the engine vibration signal corresponding to the valve, including:
[0113] The phase corresponding to the maximum vibration amplitude in the engine vibration signal is determined as the second shut-off phase.
[0114] In one possible implementation, the valve clearance anomaly determination module 904, for each valve, determines whether there is an anomaly in the valve clearance based on the comparison result of the first closing phase and the second closing phase corresponding to the valve, including:
[0115] For each valve, if the second closing phase corresponding to the valve is within the limit range, it is determined that there is no abnormality in the valve clearance. The limit range is the range determined with the first closing phase as the midpoint.
[0116] If the second closing phase of the valve exceeds the limit range, it is determined that there is an abnormality in the valve clearance.
[0117] In one possible implementation, the process of determining that there is an abnormality in the valve clearance in the valve clearance abnormality determination module 904 if the second closing phase corresponding to the valve exceeds the limit range includes:
[0118] If the second closing phase is less than the minimum value of the limit interval, then wear is determined to exist in the valve bridge and the valve stem;
[0119] If the second closing phase is greater than the maximum value of the limit range, then wear is determined to be present on the valve and valve seat.
[0120] In one possible implementation, the process of determining the target phase interval corresponding to each valve in the vibration signal acquisition module 902 includes:
[0121] For each valve, the first closing phase corresponding to the valve is taken as the midpoint of the interval, and a preset phase is extended from the midpoint to both ends to obtain the phase interval.
[0122] Reference Figure 10 As shown, embodiments of this application also provide a valve clearance monitoring system, including: an electronic control unit and a knock sensor, a crankshaft phase sensor and a camshaft phase sensor respectively connected to the electronic control unit. The knock sensor is used to acquire vibration signals of the engine, the crankshaft phase sensor and the camshaft phase sensor are used to determine the closing phase of each target valve corresponding to the target cylinder, and the electronic control unit is used to execute the valve clearance monitoring method as described in the above embodiments.
[0123] This application also provides an electronic device in its embodiments. (See reference...) Figure 11 The diagram illustrates a structural schematic suitable for implementing the electronic devices in the embodiments of this application. The electronic devices in the embodiments of this application may include, but are not limited to, ECU (Electronic Control Unit), VCU (Vehicle Control Unit), MCU (Micro Controller Unit), HCU (Hybrid Control Unit), etc. Figure 11 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.
[0124] like Figure 11 As shown, the electronic device includes at least one processor 1101 and a memory 1102 connected to the processor 1101, wherein: the memory is used to store computer programs; the processor 1101 is used to execute the computer programs to enable the electronic device to implement the valve clearance monitoring method as described in the above embodiment.
[0125] This application also provides a computer program product including computer-readable instructions, which, when executed on an electronic device, cause the electronic device to implement any of the valve clearance monitoring methods provided in this application.
[0126] This application also provides a computer-readable storage medium carrying one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any of the valve clearance monitoring methods provided in this application.
[0127] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.
[0128] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware, or it can be implemented by special-purpose hardware including application-specific integrated circuits, special-purpose CPUs, special-purpose memory, special-purpose components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for this application, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, training equipment, or network device, etc.) to execute the methods described in the various embodiments of this application.
[0129] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product.
[0130] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).
Claims
1. A method for monitoring valve clearance, characterized in that, include: The first closing phase of each valve is obtained. The first closing phase of each valve is determined according to the firing order of each cylinder of the engine and the closing phase of each target valve corresponding to the target cylinder. The target cylinder is the first cylinder to be ignited. For each valve, an engine vibration signal within a target time interval is acquired, wherein the target time interval is the time period corresponding to the target phase interval, and the target phase interval is the phase interval determined based on the first closing phase corresponding to the valve; For each valve, the second closing phase of the valve is determined based on the engine vibration signal corresponding to the valve; For each valve, the presence or absence of an abnormality in the valve clearance is determined by comparing the first closing phase and the second closing phase corresponding to the valve.
2. The valve clearance monitoring method according to claim 1, characterized in that, The process of determining the first closing phase of each valve includes: Obtain the top dead center phase corresponding to the compression top dead center of the target cylinder; For each target valve, the closing phase of the target valve is obtained based on the initial closing phase and the top dead center phase corresponding to the target valve; The first closing phase of each valve is determined based on the closing phase of each target valve and the firing order of each cylinder.
3. The valve clearance monitoring method according to claim 2, characterized in that, Obtaining the top dead center phase corresponding to the compression top dead center of the target cylinder includes: Based on the signals from the crankshaft phase sensor and the camshaft phase sensor, the top dead center phase corresponding to the compression top dead center of the target cylinder is determined.
4. The valve clearance monitoring method according to claim 1, characterized in that, The second closing phase of the valve is determined based on the engine vibration signal corresponding to the valve, including: The phase corresponding to the maximum vibration amplitude in the engine vibration signal is determined as the second shut-off phase.
5. The valve clearance monitoring method according to any one of claims 1 to 4, characterized in that, For each valve, based on the comparison between the first closing phase and the second closing phase corresponding to the valve, it is determined whether there is an abnormality in the valve clearance, including: For each valve, if the second closing phase corresponding to the valve is within the restriction range, then it is determined that there is no abnormality in the valve clearance, and the restriction range is the range determined with the first closing phase as the midpoint; If the second closing phase corresponding to the valve exceeds the limit range, it is determined that there is an abnormality in the valve clearance.
6. The valve clearance monitoring method according to claim 5, characterized in that, If the second closing phase corresponding to the valve exceeds the limit range, then it is determined that the valve clearance is abnormal, including: If the second closing phase is less than the minimum value of the restricted range, then wear is determined to exist in the valve bridge and the valve stem; If the second closing phase is greater than the maximum value of the restriction range, then it is determined that there is wear on the valve and valve seat.
7. The valve clearance monitoring method according to claim 1, characterized in that, The process of determining the target phase interval corresponding to each valve includes: For each valve, the first closing phase corresponding to the valve is taken as the midpoint of the interval, and the phase interval is obtained by extending a preset phase from the midpoint to both ends.
8. A valve clearance monitoring device, characterized in that, include: The theoretical closing phase determination module is used to obtain the first closing phase of each valve. The first closing phase of each valve is determined based on the firing order of each cylinder of the engine and the closing phase of each target valve corresponding to the target cylinder. The target cylinder is the first cylinder to be ignited. The vibration signal acquisition module is used to acquire engine vibration signals within a target time interval for each valve, wherein the target time interval is the time interval corresponding to the target phase interval, and the target phase interval is the phase interval determined according to the first closing phase corresponding to the valve. The actual closing phase determination module is used to determine, for each valve, the second closing phase of the valve based on the engine vibration signal corresponding to the valve; and, The valve clearance abnormality determination module is used to determine whether there is an abnormality in the valve clearance for each valve based on the comparison result between the first closing phase and the second closing phase corresponding to the valve.
9. A valve clearance monitoring system, characterized in that, include: An electronic control unit and a knock sensor, a crankshaft phase sensor and a camshaft phase sensor respectively connected to the electronic control unit, wherein the knock sensor is used to acquire vibration signals of the engine, the crankshaft phase sensor and the camshaft phase sensor are used to determine the closing phase of each target valve corresponding to the target cylinder, and the electronic control unit is used to execute the valve clearance monitoring method as described in any one of claims 1 to 7.
10. An electronic device, characterized in that, It includes at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program to enable the electronic device to implement the valve clearance monitoring method as described in any one of claims 1 to 7.