Intelligent monitoring method and system for valve drive

Abstract

The application provides a valve driving intelligent monitoring method and system, and belongs to the technical field of valves. A distance sensor is arranged on the end face of a sliding seat fixed to the top end of a valve rod. The distance sensor is used for detecting the distance h of the sliding seat in the axial sliding direction. Whether the valve is normally driven is judged based on the change of the distance h. The valve driving intelligent monitoring method and system can directly judge the valve movement state and reversely verify the reliability of the driving structure.

Description

Technical Field

[0001] This invention belongs to the technical field, and more specifically, it is a method and system for intelligent monitoring of valve actuation. Background Technology

[0002] The function of valves is specifically to introduce air into the engine and expel exhaust gases after combustion. From an engine structure perspective, they are divided into intake valves and exhaust valves. The intake valve's function is to draw air into the engine, mix it with fuel, and burn it, while the exhaust valve's function is to expel the exhaust gases and dissipate heat. For example, in a 4-stroke engine, there is an intake valve that opens during the intake process to introduce the air-fuel mixture from the outside, and an exhaust valve that opens during the exhaust process to expel the combustion gases from the outside. Figure 1 These valves are typically located in specific positions on the cylinder head and are responsible for blocking or connecting the combustion chamber to the outside at the appropriate time. Modern engines generally choose to design the camshaft in the upper part of the engine. The camshaft contacts the end face of the slide block fixed to the end of the valve stem, pushing the valve stem to move and realize the opening and closing of the valve, so as to drive the valve more accurately.

[0003] Given the crucial role of valves, real-time monitoring of engine performance necessitates better monitoring of valve status, specifically the valve drive mechanism. Current engine valve drive mechanisms primarily include chain drive, gear drive, and rocker arm drive. On one hand, to better monitor valves, existing technologies have designed a series of monitoring schemes for these specific drive structures. By monitoring the movement of key actuators, they determine if valve problems exist. However, this monitoring method requires specific design for the valve drive structure itself, lacking versatility and still failing to definitively determine whether the valve ultimately moves as designed. On the other hand, focusing on the reliability monitoring of the valve drive mechanism requires monitoring too many drive components and links, making monitoring extremely complex and inconvenient. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides an intelligent monitoring method and system for valve drive, which effectively solves the problems of poor applicability of valve drive monitoring, inability to directly determine the valve movement state, and difficulty in comprehensively reflecting the reliability of the valve drive mechanism in the above-mentioned background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an intelligent monitoring method for valve drive, wherein a distance sensor is provided on the end face of the slide fixed to the top of the valve stem, the distance sensor is used to detect the distance h between itself and the slide in the axial sliding direction, and based on the change of distance h, it is determined whether the valve is being driven normally.

[0006] Preferably, the distance sensor is located on the side above the top of the slide, and the distance sensor is never in contact with the rotating camshaft.

[0007] Furthermore, as the camshaft rotates, the distance sensor also moves linearly, and the linear path of the movement is located in the radial direction of the camshaft.

[0008] Specifically, this invention also uses a qualified engine as the test recording object. After the distance sensor is installed, the engine is started, and the h value detected by the distance sensor is recorded at each time interval t at each speed n1, n2, n3...nx. The ht curve corresponding to each speed is obtained. This series of ht curves serves as the standard curve for judging whether the valve is driven normally.

[0009] Based on the above method, the present invention also proposes a valve drive intelligent monitoring system, including a pair of sliding mounts and a pair of distance sensors. Each sliding mount has a distance sensor installed on it, and the distance sensor is located outside the slide fixed to the top of the valve stem. The two sliding mounts are respectively slidably mounted on the cylinder head surface. When the sliding mounts slide, the distance sensor can move radially above the slide along the camshaft parallel to the end face of the slide. It must be ensured that at least one distance sensor is opposite to the end of the slide so as to detect the distance value between the distance sensor and the slide.

[0010] Furthermore, the sliding mounting base includes a U-shaped carriage, one end of which is slidably mounted on the surface of the cylinder head, and the other end of which is fixed to a baffle. The length direction of the baffle is arranged along the axial direction of the carriage, and the camshaft is provided between the two baffles. During the rotation of the camshaft, it always makes smooth contact with the two baffles, and during the rotation of the camshaft, the two distance sensors can be simultaneously located above the carriage and can both detect the distance value.

[0011] Furthermore, the distance sensor is fixed to the lower side of the slide near the baffle, and the axis of the distance sensor is parallel to the axis of the slide.

[0012] Furthermore, the bottom end of each carriage is slidably mounted in a groove on the surface of the cylinder head.

[0013] Furthermore, the bottom sidewall of the carriage is connected to the sidewall of the slide groove opposite to the slide seat by an elastic element, and due to the smooth contact between the camshaft and the baffle, the elastic element is always in a compressed state.

[0014] Furthermore, the tops of the two baffles are fixedly connected as one unit by a connecting plate, and the camshaft cannot contact the connecting plate when it rotates.

[0015] Compared with existing technologies, the advantages of this invention are as follows: This invention directly focuses on monitoring the valve travel, avoiding various drive structures other than the valve stem in the valve drive structure. It directly monitors the valve's movement state. Regardless of the specific drive structure, the final end of the drive chain should be the opening and closing of the valve. Therefore, this invention provides direct and accurate monitoring of valve drive. Specifically, by monitoring the axial displacement of the slide connected to the valve, the valve's movement can be directly determined, and the valve's opening and closing state can be identified, thereby verifying the accuracy of the valve drive structure's execution. Furthermore, a dedicated valve drive monitoring system is ingeniously implemented, where two distance sensors alternate detection for most of the time during camshaft operation, but simultaneously detect for a limited period. This allows for comparison and verification of the consistency and accuracy of the detection parameters, improving monitoring efficiency and precision.

[0016] Furthermore, by directly monitoring the valve movement state, this invention can directly reflect whether the movement of a series of valve drive mechanisms is normal, without having to monitor and judge a series of components of the valve drive mechanism.

[0017] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0018] Figure 1 This is a local structure for valve actuation;

[0019] Figure 2 This is a schematic diagram of a valve drive monitoring method according to the present invention;

[0020] Figure 3 This is a schematic diagram showing the two distance sensors simultaneously in the detection position in this invention;

[0021] Figure 4 This is a schematic diagram of another valve drive monitoring method in this invention.

[0022] The components include: cylinder block 1, cylinder head 101, valve 2, valve stem 3, camshaft 4, slide block 5, distance sensor 6, carriage 7, baffle 8, connecting plate 9, and elastic element 10. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 2 As shown in this embodiment, the intelligent monitoring method for valve drive mainly relies on the following principle: a distance sensor 6 is installed on the end face of the slide block 5, which is fixed to the top of the valve stem 3. This distance sensor 6 is used to detect the distance h between itself and the slide block 5 in the axial sliding direction, i.e., the stroke corresponding to the valve 2. When the engine is not running, the valve 2 remains stationary in its initial position, maintaining a normal state, and h is a fixed value. However, when the engine is running and the valve 2 is working, the value of h changes. This intelligent monitoring method determines whether the valve 2 is being driven normally based on the change in distance h. In actual operation, it is recommended that the distance sensor 6 be installed on the top of the slide block 5 near the side to avoid contact or collision with the camshaft 4. That is, this distance sensor 6 must never contact the rotating camshaft 4 to avoid interfering with the monitoring.

[0025] As a specific implementation detail, when the camshaft 4 rotates, the distance sensor 6 also moves linearly, and the linear path of the movement is located in the radial direction of the camshaft 4, that is, the end face of the detection end of the distance sensor 6 is always parallel to the end face of the slide 5.

[0026] As for the specific judgment method, during operation, for a specific engine, a qualified engine can be used as the test recording object. After installing the distance sensor 6, the engine is started, and at each speed n1, n2, n3...nx, the h value detected by the distance sensor 6 is recorded once at each time interval t. The corresponding ht curve at each speed is obtained. Since the normal driving pattern of valve 2 of the same engine is relatively consistent, it is only necessary to measure the above parameters and draw the corresponding parameter curves. Then, this series of ht curves can be used as the standard curve for judging whether valve 2 is driven normally. The staff can make a preliminary judgment by comparison, or more intelligently, directly determine whether valve 2 is driven normally through some existing comparative analysis software.

[0027] Based on the specific methods described in the foregoing embodiments, a specific intelligent monitoring system for valve actuation is presented here. During its fabrication, as follows... Figure 2A pair of sliding mounting seats and a pair of distance sensors 6 are provided. Each sliding mounting seat is equipped with one distance sensor 6, and the distance sensor 6 is located outside the slide seat 5 fixed to the top of the valve stem 3, so that it can move above the end of the slide seat 5 to detect the distance value. At the same time, in this embodiment, the two sliding mounting seats are respectively slidably mounted on the surface of the cylinder head 101. Specifically, it can be to assist in the machining of the cylinder head 101, or to directly and adaptively add a corresponding mounting structure to the surface of the cylinder head 101. When the sliding mounting seats slide, the distance sensor 6 can move radially above the slide seat 5 along the camshaft 4 parallel to the end face of the slide seat 5, so as to accurately collect the distance value. At the same time, it must be ensured that at least one distance sensor 6 can be opposite to the end of the slide seat 5, so that at any time during the rotation of the camshaft 4, there is a distance sensor 6 to detect the distance value from the slide seat 5, that is, to obtain the movement displacement of the slide seat 5.

[0028] As a more complete structural design, in this embodiment, such as Figure 2 The sliding mounting base includes a U-shaped slide 7. One end of the slide 7 is slidably mounted on the surface of the cylinder head 101, and the other end is fixed to a baffle 8. The length direction of the baffle 8 is arranged along the axial direction of the slide 5. A camshaft 4 is provided between the two baffles 8. During the rotation of the camshaft 4, it always maintains smooth contact with the two baffles 8. This design allows the distance sensor 6 to match the rotation of the camshaft 4 well and adaptively move to a suitable position to detect the movement distance of the slide 5 without interfering with or colliding with the camshaft 4, which is quite ingenious. Moreover, this embodiment is good because during the rotation of the camshaft 4, if... Figure 3 As shown, both distance sensors 6 can be located above the slide block 5 at the same time and can both detect distance values. There are actually two h values ​​detected at this stage. If the two h values ​​are inconsistent or have a large difference, it means that at least one of the distance sensors 6 has a problem with its detection value. This can prompt the system to check for faults and facilitate timely repair and maintenance. It plays a double insurance role in monitoring the valve 2 drive. The structure is simple, but the design is particularly ingenious.

[0029] Furthermore, in this embodiment, a distance sensor 6 is fixed to the lower side of the slide 7 near the baffle 8. The axis of the distance sensor 6 is parallel to the axis of the slide 5 to detect the h value. Simultaneously, during actual installation, the bottom end of each slide 7 is slidably fitted into a groove on the surface of the cylinder head 101. This groove can be directly formed or created by installing additional components; those skilled in the art can adapt the design accordingly.

[0030] For the contact and engagement of the two baffles 8 with the camshaft 4, to achieve the structural design of two sensors alternately detecting the h value, one of the following could be: Figure 2-3An elastic element 10 connects the bottom sidewall of the carriage 7 to the sidewall of the slide groove opposite to the slide block 5. This elastic element 10 can be a spring. Due to the smooth contact between the camshaft 4 and the baffle 8, the elastic element 10 is always compressed, thus ensuring that the baffle 8 is always in contact with the camshaft 4. This allows the movement of the carriage 7 or the distance sensor 6 to adaptively follow the working conditions of the camshaft 4. Another implementation structure is as follows: Figure 4 The tops of the two baffles 8 are fixedly connected as one piece by a connecting plate 9, and the camshaft 4 cannot contact the connecting plate 9 when it rotates, so as to avoid the camshaft 4 from lifting and pulling the slide 7. At this time, the elastic element 10 is not needed. The two distance sensors 6 are actually mounted on a rigid element, and this rigid element moves back and forth linearly above the end of the slide 5 as the camshaft 4 rotates, thereby detecting the real-time valve 2 movement value.

[0031] Finally, it should be noted that in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve-driven intelligent monitoring system, characterized in that: It includes a pair of sliding mounts and a pair of distance sensors (6). Each sliding mount has a distance sensor (6) mounted on it, and the distance sensor (6) is located outside the slide (5) fixed to the top of the valve stem (3). The two sliding mounts are slidably mounted on the surface of the cylinder head (101). When the sliding mounts slide, the distance sensor (6) can move radially above the slide (5) along the camshaft (4) parallel to the end face of the slide (5). At least one distance sensor (6) is opposite to the end of the slide (5) so that at any time during the rotation of the camshaft (4), there is a distance sensor (6) that detects the distance value from the slide (5). The sliding mounting base includes a Г-shaped slide (7), the lower end of which is slidably mounted on the surface of the cylinder head (101), and the other end of which is fixedly connected to a baffle (8). The length direction of the baffle (8) is arranged along the axial direction of the slide (5). The camshaft (4) is provided between the two baffles (8). During the rotation of the camshaft (4), it is always in smooth contact with the two baffles (8). During the rotation of the camshaft (4), the two distance sensors (6) can be located above the slide (5) at the same time and can both detect the distance value.

2. The intelligent monitoring system for valve actuation according to claim 1, characterized in that: The distance sensor (6) is fixed on the lower side of the slide (7) near the baffle (8), and the axial direction of the distance sensor (6) is parallel to the axial direction of the slide (5).

3. The intelligent monitoring system for valve actuation according to claim 1, characterized in that: The bottom end of each carriage (7) is slidably mounted in a groove on the surface of the cylinder head (101).

4. The intelligent monitoring system for valve actuation according to claim 3, characterized in that: The bottom sidewall of the slide (7) is connected to the sidewall of the slide groove away from the slide seat (5) by an elastic element (10), and the elastic element (10) is always in a compressed state due to the smooth contact between the camshaft (4) and the baffle (8).

5. The intelligent monitoring system for valve actuation according to claim 3, characterized in that: The tops of the two baffles (8) are fixedly connected as one unit by a connecting plate (9), and the camshaft (4) cannot contact the connecting plate (9) when it rotates.

6. An intelligent monitoring method for a valve-driven intelligent monitoring system as described in claim 1, characterized in that: A distance sensor (6) is provided on the end face of the slide block (5) fixed to the top of the valve stem (3). The distance sensor (6) is used to detect the distance h between itself and the slide block (5) in the axial sliding direction. Based on the change of distance h, it is determined whether the valve (2) is driven normally. Taking a qualified engine as the test recording object, after the distance sensor (6) is installed, the engine is started. At each speed n1, n2, n3...nx, the h value detected by the distance sensor (6) is recorded once every time interval t. The ht curve corresponding to each speed is obtained. This series of ht curves is used as the standard curve for judging whether the valve (2) is driven normally.

7. The intelligent monitoring method of the intelligent monitoring system for valve actuation according to claim 6, characterized in that: The distance sensor (6) is located on the top of the slide block (5) near the side, and the distance sensor (6) is never in contact with the rotating camshaft (4).

8. The intelligent monitoring method of the intelligent monitoring system for valve actuation according to claim 7, characterized in that: When the camshaft (4) rotates, the distance sensor (6) also moves in a straight line, and the straight path of the movement is located in the radial direction of the camshaft (4).

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