Valve drive mechanism, control method, and engine

Abstract

The application relates to the technical field of engines and discloses a valve driving mechanism, a control method and an engine. The valve driving mechanism comprises the following: a shell provided with a control cavity and a piston cavity, the shell is further provided with an air inlet, a first air outlet and a second air outlet, and the shell is further provided with a first plugging position and a second plugging position; a piston assembly is located in the piston cavity and connected with a valve rod, the piston assembly divides the piston cavity into a first chamber and a second chamber, and the control cavity is in communication with the first chamber and the second chamber; an adjusting assembly is located in the control cavity, and the adjusting assembly comprises the following: in the first plugging position, the second chamber is in communication with the air inlet, and the first chamber is in communication with the first air outlet; in the second plugging position, the second chamber is in communication with the second air outlet, and the first chamber is in communication with the air inlet; and a driving mechanism is connected with the plugging piece. The application does not need a valve spring, reduces the probability of occurrence of valve float jump problems, and the application is provided with gas flow.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to a valve drive mechanism, control method and engine. Background Technology

[0002] An engine is a power unit that converts other forms of energy into mechanical energy; it is the core "heart" of vehicles such as cars, airplanes, and ships. It generates power by burning fuel to drive the machinery.

[0003] The valve drive mechanism controls the engine's breathing rhythm and volume, directly affecting power, fuel consumption, noise, and lifespan, making it one of the engine's most critical mechanical systems. Typically, the valve drive mechanism uses a camshaft-type valve train. During operation, the camshaft rotates, and the cam cam on top opens the valve; after the cam has rotated back, the valve spring pulls the valve back to close it, and this cycle continues, controlling the valve's opening and closing at the appropriate times.

[0004] However, in camshaft-type valve trains, if the valve springs fail to return to their original position in time due to metal fatigue at high engine speeds, valve float problems can easily occur. Summary of the Invention

[0005] In view of the valve spring failure to return to its original position due to metal fatigue, which can easily cause valve float in the prior art, this invention provides a valve drive mechanism, control method, and engine.

[0006] The present invention provides a valve drive mechanism, comprising: The housing is provided with a control chamber and a piston chamber. The housing is also provided with an air inlet, a first air outlet and a second air outlet. The housing is provided with a first sealing position and a second sealing position. A piston assembly, located in the piston chamber and connected to the valve stem, divides the piston chamber into a first chamber and a second chamber, and the control chamber is in communication with the first chamber and the second chamber respectively; An adjustment assembly, located in the control chamber, includes a blocking element and a driving mechanism. In the first blocking position, the second chamber is connected to the air inlet, and the first chamber is connected to the first air outlet; in the second blocking position, the second chamber is connected to the second air outlet, and the first chamber is connected to the air inlet; the driving mechanism is connected to the blocking element and is used to drive the blocking element to move between the first blocking position and the second blocking position.

[0007] In one embodiment, the control chamber is connected to the first chamber via a first ventilation port, and the control chamber is connected to the second chamber via a second ventilation port. The control chamber is also provided with a first valve and a second valve at intervals, the first valve being located between the first ventilation port and the air inlet, and the second valve being located between the second ventilation port and the air inlet.

[0008] In one embodiment, the sealing member includes a main body and a first sealing part, a second sealing part and a third sealing part sequentially disposed on the main body. The first sealing part is used to block the first air outlet, the second sealing part is used to block the first valve or the second valve, and the third sealing part is used to block the second air outlet.

[0009] In one embodiment, the drive mechanism includes: A drive component, connected to one end of the sealing member, is used to drive the sealing member from the first sealing position to the second sealing position; A reset component, connected to the other end of the sealing component, is used to drive the sealing component from the second sealing position to the first sealing position.

[0010] In one embodiment, the driving component includes: A permanent magnet is connected to the end of the main body away from the reset member; and An electromagnetic coil is located inside the control cavity and connected to the housing. The electromagnetic coil is sleeved on the permanent magnet and is used for signal connection with the engine control unit.

[0011] In one embodiment, the reset member includes an elastic member, one end of which abuts against the sealing member along its length and the other end of which abuts against the housing.

[0012] In one embodiment, the valve stem is provided with an annular groove, and the piston assembly includes: At least two piston components are located in the piston chamber; A retaining ring surrounds the annular groove and is located between two adjacent piston members. A connector, which is connected to at least two of the pistons.

[0013] In one embodiment, the piston assembly further includes a sealing ring that surrounds the piston member and abuts against the inner wall of the piston chamber.

[0014] In one embodiment, an oil seal is also included, which is fitted onto the valve stem and is used to connect to the cylinder head.

[0015] Secondly, this application also includes a control method for a valve drive mechanism, applied to the valve drive mechanism described in any of the above claims, comprising: acquiring engine operating parameters; when the engine operating parameters meet preset opening conditions, controlling a drive assembly to operate, the drive assembly driving a sealing member to move, driving the sealing member to move from a first sealing position to a second sealing position, so that gas enters a first chamber from an intake port, and gas in the second chamber flows out from a second outlet, and driving a piston assembly to move the valve stem toward the second chamber; When the drive assembly is energized for a target duration, or when the piston assembly moves to the position where the piston chamber faces the cylinder head, the drive assembly is controlled to stop working. The reset member drives the sealing member to move from the second sealing position to the first sealing position, allowing gas to enter the second chamber from the intake port and the gas in the first chamber to flow out from the first outlet. The piston assembly is then driven to move the valve stem toward the first chamber. The target duration is determined based on the engine operating parameters.

[0016] In one embodiment, the engine operating parameters include the crankshaft phase angle; the control method further includes: If the crankshaft phase angle is within a preset angle range, then the engine operating parameters are determined to meet the preset activation conditions. The engine operating parameters include engine speed and load; the control method further includes: substituting the engine speed and load into a calibration table to determine the target duration.

[0017] Thirdly, this application also includes an engine, characterized in that it includes a valve drive mechanism as described in any of the preceding claims and an engine control unit, wherein the engine control unit is used to control the operation of the drive components of the valve drive mechanism.

[0018] According to the valve drive mechanism, control method, and engine provided in the embodiments of this application, the valve drive mechanism includes a housing, a piston assembly, and an adjustment assembly. The housing is provided with a control chamber and a piston chamber, and also has an intake port, a first outlet port, and a second outlet port. The housing is provided with a first blocking position and a second blocking position. The piston assembly is located in the piston chamber and connected to the valve stem. The piston assembly divides the piston chamber into a first chamber and a second chamber. The control chamber is connected to the first chamber and the second chamber. The adjustment assembly is located in the control chamber and includes a blocking member, a drive assembly, and a reset member. In the first blocking position, the second chamber is connected to the intake port, and the first chamber is connected to the first outlet port. In the second blocking position, the second chamber is connected to the second outlet port, and the first chamber is connected to the intake port. The drive assembly is connected to the blocking member and is used to drive the blocking member to move between the first blocking position and the second blocking position. This application controls the sealing component via a drive mechanism, thereby regulating the air pressure in the first and second chambers. This, in turn, drives the piston assembly and valve stem, controlling the valve opening and closing degree and the valve opening duration. Furthermore, this application eliminates the need for valve springs, reducing the probability of valve bounce problems. The improved gas flow also effectively removes heat, reducing heat buildup in the engine. Attached Figure Description

[0019] Figure 1 An exploded view of a valve drive mechanism provided in an embodiment of this application is shown; Figure 2 This illustration shows a cross-sectional view of a valve drive mechanism provided in an embodiment of this application at a first blocking position; Figure 3 This is a cross-sectional view of a valve drive mechanism provided in an embodiment of this application at a second sealing position.

[0020] The reference numerals in the accompanying drawings include: 1. Housing; 11. Control unit; 111. Control chamber; 112. First air exchange port; 113. Air inlet; 114. First air outlet; 115. Second air outlet; 116. First valve; 117. Second valve; 118. Second air exchange port; 12. Piston unit; 121. Piston chamber; 1211. First chamber; 1212. Second chamber; 21. Sealing component; 211. Main body; 212. First sealing component; 213. Second sealing component; 214. Third sealing component; 22. Drive assembly; 221. Permanent magnet; 222. Electromagnetic coil; 23. Reset component; 3. Piston assembly; 31. Piston component; 32. Snap ring; 33. Connecting component; 34. Sealing ring; 4. Valve stem; 41. Ring groove; 5. Oil seal. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] The valve drive mechanism controls the engine's breathing rhythm and volume, directly affecting power, fuel consumption, noise, and lifespan, making it one of the engine's most critical mechanical systems. Typically, the valve drive mechanism uses a camshaft-type valve train. During operation, the camshaft rotates, and the cam cam on top opens the valve; after the cam has rotated back, the valve spring pulls the valve back to close it, and this cycle continues, controlling the valve's opening and closing at the appropriate times.

[0023] However, in camshaft-type valve trains, if the valve springs fail to return to their original position in time due to metal fatigue at high engine speeds, valve float problems can easily occur.

[0024] To solve the above problems, refer to Figures 1-3 , Figure 1 This diagram shows an exploded view of a valve drive mechanism according to an embodiment of this application. Figure 2 This illustration shows a cross-sectional view of a valve drive mechanism provided in an embodiment of this application at a first blocking position. Figure 3 This is a cross-sectional view of a valve drive mechanism provided in an embodiment of this application at a second sealing position.

[0025] This application provides a valve drive mechanism, including a housing 1, a piston assembly 3, and an adjustment assembly. The housing 1 is provided with a control chamber 111 and a piston chamber 121. The housing 1 is also provided with an air inlet 113, a first air outlet 114, and a second air outlet 115. The housing 1 is provided with a first sealing position and a second sealing position. The piston assembly 3 is located in the piston chamber 121 and connected to a valve stem 4. The piston assembly 3 divides the piston chamber 121 into a first chamber 1211 and a second chamber 1212. The control chamber 111 is connected to the first chamber 1211 and the second chamber 1212 respectively. The regulating component is located in the control chamber 111. The regulating component includes a blocking member 21 and a driving mechanism. The blocking member 21 has a first blocking position and a second blocking position. In the first blocking position, the second chamber 1212 is connected to the air inlet 113, and the first chamber 1211 is connected to the first air outlet 114. In the second blocking position, the second chamber 1212 is connected to the second air outlet 115, and the first chamber 1211 is connected to the air inlet 113. The driving mechanism is connected to the blocking member 21 and is used to drive the blocking member 21 to move between the first blocking position and the second blocking position.

[0026] It should be understood that the valve drive mechanism includes a housing 1, which includes a control unit 11. The control unit 11 is elongated and has a control cavity 111. The cross-section of the control cavity 111 can be circular or rectangular; this application does not impose any limitation. In one example, the control cavity 111 has a circular cross-section along the longitudinal direction of the control unit 11. The control unit 11 also has an air inlet 113, a first air outlet 114, and a second air outlet 115. An air inlet pipe for connecting to a high-pressure gas tank can be provided at the air inlet 113, and air outlet pipes can be provided at both the first air outlet 114 and the second air outlet 115 to facilitate gas discharge. The air inlet 113, the first air outlet 114, and the second air outlet 115 are spaced apart along the length of the control unit 11.

[0027] The housing 1 also includes a piston portion 12. The cross-section of the piston portion 12 can be circular or rectangular; this application does not impose any limitation. In one example, the control cavity 111 has a circular cross-section along the transverse section of the control portion 11. The piston portion 12 is connected to the control portion 11, and the connection method can be welding or integral molding; this application does not impose any limitation. The piston portion 12 is provided with a piston chamber 121, and the two ends of the piston chamber 121 are respectively connected to the control cavity 111 through a first air exchange port 112 and a second air exchange port 118. The housing 1 also includes a first sealing position and a second sealing position.

[0028] The valve drive mechanism also includes a piston assembly 3, which is located in the piston chamber 121 and divides the piston chamber 121 into a first chamber 1211 and a second chamber. The first chamber 1211 is connected to the control chamber 111 through a first air vent 112, and the second chamber 1212 is connected to the control chamber 111 through a second air vent 118. The piston assembly 3 is connected to the valve stem 4, and when the piston assembly 3 moves, it can drive the valve stem 4 to move.

[0029] The valve drive mechanism also includes an adjustment assembly, which includes a sealing element 21 and a drive mechanism. The sealing element 21 has a first sealing position and a second sealing position in the control chamber 111. When the sealing element 21 is in the first sealing position, the second air outlet 115 is blocked, the second chamber 1212 is connected to the air inlet 113 through the second air exchange port 118, the air inlet 113 is blocked from the first air exchange port 112, and the first chamber 1211 is connected to the first air outlet 114, so that the pressure in the second chamber 1212 is greater than the pressure in the first chamber 1211.

[0030] When the sealing component 21 is in the second sealing position, the first air outlet 114 is blocked, the first chamber 1211 is connected to the air inlet 113 through the first air exchange port 112, the air inlet 113 is blocked from the second air exchange port 118, and the second chamber 1212 is connected to the second air outlet 115, so that the pressure in the first chamber 1211 is greater than the pressure in the second chamber 1212.

[0031] The drive mechanism is located in the control cavity 111 and connected to the housing 1. The output end of the drive mechanism is connected to the sealing member 21. The drive assembly 22 can be a linear drive motor, a lead screw slide, a cylinder, a hydraulic cylinder, or other drive components. This application does not impose any restrictions. The drive assembly 22 can drive the sealing member 21 to move from the first sealing position to the second sealing position. The drive mechanism can also drive the sealing member 21 to move from the first sealing position to the second sealing position.

[0032] Therefore, by cooperating with the drive mechanism and the sealing member 21, the position of the sealing member 21 in the control cavity 111 can be controlled, thereby controlling the communication between the control cavity 111 and the first chamber 1211 and the second chamber 1212, and thus controlling the situation in the gas first chamber 1211 and the second chamber 1212.

[0033] Reference Figure 2 and Figure 3 In the first state, the drive mechanism works and drives the sealing member 21 to move, so that the sealing member 21 moves from the first sealing position to the second sealing position, the first air outlet 114 is blocked, the first chamber 1211 and the air inlet 113 are connected through the first air exchange port 112, the air inlet 113 and the second air exchange port 118 are blocked, and the second chamber 1212 and the second air outlet 115 are connected, so that the pressure in the first chamber 1211 is greater than the pressure in the second chamber 1212, driving the piston assembly 3 to move toward the second chamber 1212, and the piston assembly 3 drives the valve stem 4 to move downward, thereby opening the valve.

[0034] In the second state, the drive mechanism drives the sealing member 21 to move from the second sealing position to the first sealing position, the second air outlet 115 is blocked, the second chamber 1212 and the air inlet 113 are connected through the second air exchange port 118, the air inlet 113 and the first air exchange port 112 are blocked, the first chamber 1211 and the first air outlet 114 are connected, so that the pressure in the second chamber 1212 is greater than the pressure in the first chamber 1211, the piston assembly 3 is driven to move toward the first chamber 1211, the piston assembly 3 drives the valve stem 4 to move upward, thereby closing the valve.

[0035] This application controls the sealing component 21 via the drive assembly 22 and the reset component 23, thereby controlling and regulating the air pressure in the first chamber 1211 and the second chamber 1212. This drives the movement of the piston assembly 3 and the valve stem 4, controlling the opening and closing degree of the valve and the valve opening duration. Furthermore, this application eliminates the need for valve springs, reducing the probability of valve bounce problems. The improved gas flow also helps to remove heat promptly, reducing heat buildup in the engine.

[0036] In some optional embodiments, the control chamber 111 is connected to the first chamber 1211 via a first ventilation port 112, and the control chamber 111 is connected to the second chamber 1212 via a second ventilation port 118. A first valve 116 and a second valve 117 are also spaced apart within the control chamber 111. The first valve 116 is located between the first ventilation port 112 and the air inlet 113, and the second valve 117 is located between the second ventilation port 118 and the air inlet 113. The first valve 116 and the second valve 117 protrude from the inner wall of the control section 11, and are spaced apart along the length of the control section 11. The inner diameter of the first valve 116 is smaller than the inner diameter of the control chamber 111, and the inner diameter of the second valve 117 is smaller than the inner diameter of the control chamber 111.

[0037] In some optional embodiments, the sealing member 21 includes a main body 211 and a first sealing part 212, a second sealing part 213, and a third sealing part 214 connected to the main body 211. The first sealing part 212 is used to seal the first air outlet 114, the second sealing part 213 is used to seal the first valve 116 or the second valve 117, and the third sealing part 214 is used to seal the second air outlet 115. The sealing member 21 is elongated and includes the main body 211, the first sealing part 212, the second sealing part 213, and the third sealing part 214. The diameter of the main body 211 is smaller than the inner diameter of the control cavity 111, allowing gas to move within the main body 211. The first sealing part 212 is integrally formed with the main body part 211. The first sealing part 212 is cylindrical and its diameter is larger than that of the main body part 211. The first sealing part 212 is used to block the first air outlet 114. When the first sealing part 212 is located at the first air outlet 114, it can prevent the gas in the control chamber 111 from flowing out of the first air outlet 114.

[0038] The second sealing part 213 is cylindrical and integrally formed with the main body 211. The diameter of the second sealing part 213 is larger than the diameter of the main body 211 and is adapted to the diameter of the first valve 116 and the second valve 117. The second sealing part 213 is used to seal the first valve 116 or the second valve 117. When the second sealing part 213 is located at the first valve 116, the air inlet 113 is sealed with the first chamber 1211, which can prevent gas from entering the first chamber 1211 from the air inlet 113. When the second sealing part 213 is located at the second valve 117, the air inlet 113 is sealed with the second chamber 1212, which can prevent gas from entering the second chamber 1212 from the air inlet 113.

[0039] The first sealing part 212, the second sealing part 213, and the third sealing part 214 are arranged at intervals. When the first sealing part 212 is misaligned with the first air outlet 114, the second sealing part 213 blocks the first valve 116, the first air outlet 114 is connected to the first chamber 1211, the third sealing part 214 blocks the second air outlet 115, and the air inlet 113 is connected to the second chamber 1212.

[0040] When the first sealing part 212 blocks the first air outlet 114, the second sealing part 213 blocks the second valve 117, the air inlet 113 is connected to the first chamber 1211, the third sealing part 214 is offset from the second air outlet 115, and the second air outlet 115 is connected to the second chamber 1212.

[0041] In some optional embodiments, the driving mechanism includes a driving component 22 and a resetting component 23. The driving component 22 is connected to one end of the blocking component 21 and is used to drive the blocking component 21 from a first blocking position to a second blocking position. The resetting component 23 is connected to the other end of the blocking component 21 and is used to drive the blocking component 21 from the second blocking position to the first blocking position. The driving component 22 is located in the control cavity 111 and connected to the housing 1. The driving component 22 is connected to one end of the blocking component 21, that is, the driving component 22 is connected to one end of the main body 211. The driving component 22 can be a linear drive motor, a lead screw slide, a cylinder, a hydraulic cylinder, or other driving components.

[0042] The reset component 23 is located in the control cavity 111 and connected to the housing 1. The reset component 23 is connected to one end of the sealing component 21, that is, the reset component 23 is connected to the second sealing part 213. The reset component 23 can be a linear drive motor, a lead screw slide, a cylinder, a hydraulic cylinder, a spring, etc.

[0043] In the first state, the drive component 22 is working and drives the sealing member 21 to move, so that the sealing member 21 moves from the first sealing position to the second sealing position; in the second state, the second drive component 22 is not working, and the reset member 23 drive mechanism drives the sealing member 21 to move from the second sealing position to the first sealing position.

[0044] In some alternative embodiments, the drive assembly 22 includes a permanent magnet 221 and an electromagnetic coil 222; the permanent magnet 221 is connected to the end of the main body 211 away from the reset member 23; the electromagnetic coil 222 is located in the control cavity 111 and connected to the housing 1, the electromagnetic coil 222 is sleeved on the permanent magnet 221, and the electromagnetic coil 222 is used to connect to the engine control unit (ECU) signal.

[0045] The permanent magnet 221 is cylindrical and sleeved on the outer surface of the main body 211. When the permanent magnet 221 moves, it can drive the main body 211 to move, thereby adjusting the position of the first sealing part 212 and the second sealing part 213. The electromagnetic coil 222 is located in the control cavity 111 and connected to the control part 11. The electromagnetic coil 222 is sleeved on the permanent magnet 221. When the electromagnetic coil 222 is energized, it can control the movement of the permanent magnet 221.

[0046] The electromagnetic coil 222 is used to connect to the engine control unit (ECU) for signal connection. The engine control unit can control the electromagnetic coil 222 according to the engine conditions, thereby controlling the drive assembly 22. The setting of the engine control unit (ECU) can improve the intelligence of this application.

[0047] In some optional embodiments, the reset member 23 includes an elastic element, one end of which abuts against the sealing member 21 along its length and the other end against the housing 1. The elastic element can be a spring, disc spring, or other elastic element, and this application is not limited to this. One end of the elastic element abuts against the sealing member 21 along its length, and the other end abuts against the control unit 11. When the drive assembly 22 applies a thrust to the sealing member 21, the sealing member 21 moves toward the reset member 23, and the reset member 23 is compressed. When the drive assembly 22 does not apply a thrust to the sealing member 21, the reset member 23 returns to its original position, and the reset member 23 drives the sealing member 21 to move toward the drive assembly 22. The reset member 23 of this application uses an elastic element, which, compared to using a cylinder, hydraulic cylinder, or other parts, does not require additional energy, reducing operating costs.

[0048] Reference Figures 1-3 In some optional embodiments, the valve stem 4 is provided with an annular groove 41, and the piston assembly 3 includes at least two piston members 31, a retaining ring 32 and a connecting member 33. The at least two piston members 31 are located in the piston chamber 121; the retaining ring 32 surrounds the annular groove and is located between two adjacent piston members 31, and the connecting member 33 is connected to the at least two piston members 31.

[0049] The piston element 31 can be two, three, or four, etc., and this application does not impose any restrictions. In one example, there are two piston elements 31, and the following example uses two piston elements 31.

[0050] The valve stem 4 has an annular groove 41 at one end for connecting to the piston assembly 3. The annular groove 41 is used to fix the retaining ring 32, which is sleeved in the annular groove 41. The piston assembly 3 includes two piston members 31, which are arranged in a circular plate shape and adapted to the piston chamber 121. The two piston members 31 are overlapped, and the retaining ring 32 is located between the two piston members 31. The two piston members 31 are connected by a connector 33, which can be a bolt. The connector 33 connects the two piston members 31 along the axial direction of the piston members 31. Multiple connectors 33 can be provided and arranged around the center of the piston members 31 to improve the stability of the connection between the two piston members 31.

[0051] This application connects the valve stem 4 to the piston 31 by means of the ring groove 41, the retaining ring 32 and the connecting piece 33.

[0052] In some optional embodiments, the piston assembly 3 further includes a sealing ring 34 that surrounds the piston member 31 and abuts against the inner wall of the piston cavity 121. Each piston member 31 has a sealing ring 34 on its circumference, which improves the sealing effect between the piston member 31 and the inner wall of the piston cavity 121.

[0053] In some optional embodiments, an oil seal 5 is also included, which is sleeved on the valve stem 4 and connected to the cylinder head. It can be seen that a valve spring is no longer needed at the valve stem 4; therefore, this application is not affected by the valve spring, reducing the occurrence of valve bounce problems.

[0054] This application also includes a control method for a valve drive mechanism, applied to any of the valve drive mechanisms described above, comprising: Obtain engine operating parameters; When the engine operating parameters meet the preset opening conditions, the control drive assembly 22 is activated, and the drive assembly 22 drives the sealing member 21 to move from the first sealing position to the second sealing position, so that the gas enters the first chamber 1211 from the air inlet 113 and the gas in the second chamber 1212 flows out from the second air outlet 115. The drive piston assembly 3 drives the valve stem 4 to move toward the second chamber 1212. When the drive assembly 22 is energized for the target duration, or when the piston assembly 3 moves to the piston chamber 121 facing the cylinder head, the drive assembly 22 is controlled to stop working. The reset member 23 drives the sealing member 21 to move from the second sealing position to the first sealing position, so that gas enters the second chamber 1212 from the intake port 113, and gas in the first chamber 1211 flows out from the first outlet port 114. The drive piston assembly 3 drives the valve stem 4 to move towards the first chamber 1211. The target duration is determined according to the engine operating parameters.

[0055] The piston assembly 3 moves to the piston chamber 121 facing the cylinder head end, that is, the piston assembly 3 moves to the bottom of the piston chamber 121. This application obtains engine operating parameters through the engine control unit and also sends signals to the drive assembly 22 through the engine control unit to control whether the drive assembly 22 works and to control the working duration of the drive assembly 22, so as to complete the opening and closing of the valve.

[0056] In some optional embodiments, the engine operating parameters include the crankshaft phase angle; the control method further includes: if the crankshaft phase angle is within a preset angle range, then determining that the engine operating parameters meet the preset activation conditions. In one example, the engine control unit detects the current crankshaft rotation phase angle and compares the crankshaft phase signal with a preset value, for example, the preset value is 10° and the allowable tolerance range is ±2°, that is, the preset angle range is 8°-12°. When the crankshaft phase angle is within this preset angle range, the engine control unit sends an activation signal to the drive assembly 22, causing the drive assembly 22 to be energized and operated.

[0057] In some optional embodiments, the engine operating parameters include engine speed and load; the control method further includes: substituting the engine speed and load into a calibration table to determine the target duration, thereby determining the operating duration of the drive component 22.

[0058] Reference Figures 1-3 This application also includes an engine, including a valve drive mechanism as described in any of the preceding claims and an engine control unit, the engine control unit being used to control the operation of the drive assembly 22 of the valve drive mechanism.

[0059] The valve drive mechanism includes a housing 1, a piston assembly 3, and an adjustment assembly. The housing 1 has a control chamber 111 and a piston chamber 121. The housing 1 also has an air inlet 113, a first air outlet 114, and a second air outlet 115. The piston assembly 3 is located in the piston chamber 121 and connected to the valve stem 4. The piston assembly 3 divides the piston chamber 121 into a first chamber 1211 and a second chamber 1212. The control chamber 111 communicates with the first chamber 1211 and the second chamber 1212. The adjustment assembly is located in the control chamber 111 and includes a sealing element 21, a drive assembly 22, and... The reset component 23 and the sealing component 21 have a first sealing position and a second sealing position. In the first sealing position, the second chamber 1212 is connected to the air inlet 113, and the first chamber 1211 is connected to the first air outlet 114. In the second sealing position, the second chamber 1212 is connected to the second air outlet 115, and the first chamber 1211 is connected to the air inlet 113. The drive assembly 22 is connected to the sealing component 21 and is used to drive the sealing component 21 to move from the first sealing position to the second sealing position. The reset component 23 is connected to the sealing component 21 and is used to drive the sealing component 21 to move from the second sealing position to the first sealing position.

[0060] This application uses the engine control unit to determine whether the drive assembly 22 needs to operate, and controls the sealing component 21 via the drive assembly 22 and the reset component. This, in turn, controls and regulates the air pressure in the first chamber 1211 and the second chamber 1212, thereby driving the movement of the piston assembly 3 and the valve stem 4, controlling the degree of valve opening and closing, and also controlling the valve opening duration. Furthermore, this application eliminates the need for valve springs, reducing the probability of valve bounce problems. The gas flow in this application also helps to remove heat promptly, reducing heat buildup in the engine.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A valve drive mechanism, characterized in that, include: The housing (1) is provided with a control chamber (111) and a piston chamber (121). The housing (1) is also provided with an air inlet (113), a first air outlet (114) and a second air outlet (115). The housing (1) is provided with a first sealing position and a second sealing position. The piston assembly (3) is located in the piston chamber (121) and connected to the valve stem (4). The piston assembly (3) divides the piston chamber (121) into a first chamber (1211) and a second chamber (1212). The control chamber (111) is connected to the first chamber (1211) and the second chamber (1212) respectively. An adjustment assembly is located in the control chamber (111). The adjustment assembly includes a blocking member (21) and a driving mechanism. In the first blocking position, the second chamber (1212) is connected to the air inlet (113), and the first chamber (1211) is connected to the first air outlet (114). In the second blocking position, the second chamber (1212) is connected to the second air outlet (115), and the first chamber (1211) is connected to the air inlet (113). The driving mechanism is connected to the blocking member (21) and is used to drive the blocking member (21) to move between the first blocking position and the second blocking position.

2. The valve drive mechanism according to claim 1, characterized in that: The control chamber (111) is connected to the first chamber (1211) through the first air exchange port (112), and the control chamber (111) is connected to the second chamber (1212) through the second air exchange port (118). The control chamber (111) is also provided with a first valve (116) and a second valve (117) at intervals. The first valve (116) is located between the first air exchange port (112) and the air inlet (113), and the second valve (117) is located between the second air exchange port (118) and the air inlet (113).

3. The valve drive mechanism according to claim 2, characterized in that: The sealing component (21) includes a main body (211) and a first sealing part (212), a second sealing part (213) and a third sealing part (214) sequentially disposed on the main body (211). The first sealing part (212) is used to block the first air outlet (114), the second sealing part (213) is used to block the first valve (116) or the second valve (117), and the third sealing part (214) is used to block the second air outlet (115).

4. The valve drive mechanism according to claim 3, characterized in that: The drive mechanism includes: A drive assembly (22) is connected to one end of the sealing member (21) and is used to drive the sealing member (21) from the first sealing position to the second sealing position; The reset member (23) is connected to the other end of the blocking member (21) and is used to drive the blocking member (21) from the second blocking position to the first blocking position.

5. The valve drive mechanism according to claim 4, characterized in that: The driving component (22) includes: A permanent magnet (221) is connected to one end of the main body (211) away from the reset member (23); and An electromagnetic coil (222) is located inside the control cavity (111) and connected to the housing (1). The electromagnetic coil (222) is sleeved on the permanent magnet (221). The electromagnetic coil (222) is used to connect to the engine control unit signal.

6. The valve drive mechanism according to claim 4, characterized in that: The reset member (23) includes an elastic member, one end of which abuts against the sealing member (21) along its length and the other end of which abuts against the housing (1).

7. The valve drive mechanism according to claim 2, characterized in that: The valve stem (4) is provided with an annular groove (41), and the piston assembly (3) includes: At least two piston components (31) are located in the piston chamber (121); A retaining ring (32) surrounds the annular groove (41) and is located between two adjacent piston members (31). The connector (33) is connected to at least two of the pistons (31).

8. The valve drive mechanism according to claim 7, characterized in that: The piston assembly (3) further includes a sealing ring (34) that surrounds the piston (31) and abuts against the inner wall of the piston chamber (121).

9. The valve drive mechanism according to claim 1, characterized in that: It also includes an oil seal (5) fitted onto the valve stem (4), the oil seal (5) being used to connect to the cylinder head.

10. A control method for a valve drive mechanism, characterized in that: Applied to the valve drive mechanism according to any one of claims 1-9, comprising: Obtain engine operating parameters; When the engine operating parameters meet the preset opening conditions, the control drive assembly (22) is operated. The drive assembly (22) drives the sealing member (21) to move from the first sealing position to the second sealing position, so that the gas enters the first chamber (1211) from the air inlet (113) and the gas in the second chamber (1212) flows out from the second air outlet (115). The drive piston assembly (3) drives the valve stem (4) to move toward the second chamber (1212). When the energization time of the drive assembly (22) reaches the target time, or when the piston assembly (3) moves to the piston chamber (121) facing the cylinder head end, the drive assembly (22) is controlled to stop working, and the reset member (23) drives the sealing member (21) to move from the second sealing position to the first sealing position, so that the gas enters the second chamber (1212) from the air inlet (113) and the gas in the first chamber (1211) flows out from the first air outlet (114), and the piston assembly (3) drives the valve stem (4) to move towards the first chamber (1211); wherein, the target time is determined according to the engine operating parameters.

11. The control method for the valve drive mechanism according to claim 10, characterized in that: The engine operating parameters include the crankshaft phase angle; the control method further includes: If the crankshaft phase angle is within a preset angle range, then the engine operating parameters are determined to meet the preset activation conditions. The engine operating parameters include engine speed and load; the control method further includes: substituting the engine speed and load into a calibration table to determine the target duration.

12. An engine, characterized in that: Includes a valve drive mechanism as described in any one of claims 1-9 and an engine control unit, wherein the engine control unit is used to control the operation of the drive assembly (22) of the valve drive mechanism.

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