Operation measurement system, method and device of variable valve lift engine

Abstract

The invention provides an operation measurement system, method and device for a variable valve lift engine. The operation measurement system comprises a control device, a measurement device set and the variable valve lift engine. The engine comprises an air cylinder, a driver, a cam shaft and a valve mechanism, the cam shaft comprises a cam shaft mandrel and a sliding sleeve, the sliding sleeve is in sliding connection with the cam shaft mandrel, and the sliding sleeve and the air cylinder are correspondingly arranged; the control device is used for generating a driving signal, driving the driver to rotate and controlling the variable valve mechanism lift actuator to extend out of the pin; the driver rotates to drive the cam shaft mandrel to rotate so as to push the valve mechanism to move, and a pin extending out of the variable valve mechanism lift actuator rotates along with a spiral groove of the sliding sleeve so as to push the sliding sleeve to move along the cam shaft mandrel. Wherein the measuring device set comprises an angle measuring device used for measuring the rotating angle information of the cam shaft and a distance measuring device used for measuring the lift information of the valve mechanism and the displacement information of the at least one sliding sleeve.

Description

Technical Field

[0001] The present application relates to the field of engines, and more specifically, to an operation measurement system, method and device for a variable valve lift engine. Background Art

[0002] In the field of reciprocating internal combustion engines, the camshaft controls the opening and closing of the engine valves by direct or indirect drive to coordinate the intake and exhaust of the engine cylinders.

[0003] The variable valve lift technology of the engine can match the appropriate valve lift according to the different working conditions of the engine. When idling, some valves are controlled to be closed for a long time to realize the cylinder deactivation function, save fuel and reduce emissions; low valve lift is used at low load and low speed to reduce pumping loss, save fuel and improve thermal efficiency; high valve lift is used at high load and high speed to increase the output power and torque of the engine and enhance the power. In general, variable valve lift technology can better balance the environmental protection, economy and power performance of the engine.

[0004] In the existing technology, variable valve lift is divided into continuously variable valve lift and multi-stage variable valve lift. The sliding sleeve camshaft design in the implementation of multi-stage variable valve lift can change the valve lift by sliding the sleeve. The sliding sleeve needs external force to move. The sleeve moves along the axial direction of the camshaft to achieve the coordination of cams with different lifts and rocker arms. The stable switching of different cams requires the sleeve to be limited by a spring steel ball.

[0005] Therefore, during the development of the sliding sleeve camshaft, in order to accurately control the switching action of the sliding sleeve, ensure the safe coordination of the cam and the rocker arm and the normal opening of the valve, it is necessary to accurately measure the valve lift and the displacement of the sliding sleeve.

[0006] However, there is no method or device for measuring the displacement of the sliding sleeve of each cylinder in the engine in the prior art, so it is impossible to accurately understand the operating conditions of the engine. Summary of the invention

[0007] In view of this, the present application provides an operation measurement system, method and device for a variable valve lift engine, as follows:

[0008] A variable valve lift engine operation measurement system, comprising:

[0009] Control device, measuring device assembly, variable valve lift engine;

[0010] The engine comprises: at least one cylinder, a driver, a camshaft, a valve mechanism, the camshaft comprises a camshaft core shaft and at least one sliding sleeve, the sliding sleeve is slidably connected to the camshaft core shaft, and the sliding sleeve is arranged corresponding to the cylinder;

[0011] Wherein, the control device is used to generate a drive signal, wherein the drive signal is used to drive the driver to rotate and control the variable valve mechanism lift actuator to extend the pin;

[0012] wherein the driver rotates to drive the camshaft core shaft of the engine to rotate to drive the valve mechanism to move, and the pin extended from the variable valve mechanism lift actuator rotates following the spiral groove of the sliding sleeve to drive the at least one sliding sleeve to move along the camshaft core shaft;

[0013] The measuring device set includes an angle measuring device and a distance measuring device, the angle measuring device is used to measure the camshaft angle information, and the distance measuring device is used to measure the lift information of the valve mechanism and the displacement information of the at least one sliding sleeve.

[0014] Optionally, in the above system, the distance measuring device comprises:

[0015] Valve lift sensor and sleeve displacement measurement structure;

[0016] The valve lift sensor is arranged corresponding to the valve mechanism and is used to measure the lift of the valve mechanism;

[0017] The sleeve displacement measuring structure includes: at least one displacement measuring unit and a displacement guide rail arranged parallel to the camshaft core shaft; the displacement measuring unit is arranged corresponding to the sliding sleeve and moves synchronously with the sliding sleeve; the first end of the displacement measuring unit is slidably connected to the displacement guide rail, and the second end is fixed in a relative position to the sliding sleeve, and the relative position is less than a preset distance.

[0018] Optionally, in the above system, the sliding sleeve comprises a first cam group and a second cam group, and a gap is provided between the first cam group and the second cam group and the first cam group and the second cam group slides along the cam shaft core shaft;

[0019] The second end of the displacement measuring unit includes a connection area, and the connection area is plugged into the gap.

[0020] Optionally, in the above system, the sleeve displacement measurement structure further includes:

[0021] The displacement signal output terminal is used to obtain displacement information of the at least one displacement measuring unit, wherein the displacement information represents the displacement of the sliding sleeve corresponding to the displacement measuring unit.

[0022] Optionally, in the above system, the engine further comprises: a camshaft cover;

[0023] The camshaft is arranged on one side of the camshaft cover, and the displacement guide rail of the sleeve displacement measuring structure is arranged on the other side of the camshaft cover;

[0024] The camshaft cover is provided with at least one opening, the opening is provided corresponding to the displacement measuring unit, and the relative position of the second end of the displacement measuring unit and the sliding sleeve is fixed through the opening.

[0025] Optionally, in the above system, the camshaft cover is fixedly connected to the sleeve displacement measuring structure.

[0026] A method for measuring the operation of a variable valve lift engine, applied to a system as described in any one of the above, the method comprising:

[0027] Generate a drive signal, the drive signal is used to drive the driver of the engine to rotate and drive the variable valve lift actuator to perform a pin extension action, the rotation of the driver drives the camshaft core shaft of the engine to rotate to promote the movement of the valve mechanism, the pin extended by the variable valve lift actuator follows the spiral groove of the sliding sleeve to rotate to promote at least one sliding sleeve to move along the camshaft core shaft, and the sliding sleeve is correspondingly arranged with the cylinder in the engine;

[0028] Obtaining camshaft angle information of the engine, lift information of the valve mechanism, and movement distance information of the at least one sliding sleeve;

[0029] The camshaft angle information of the engine, the lift information of the valve mechanism and the moving distance information of the at least one sliding sleeve are processed to obtain a processing result.

[0030] Optionally, the above method further includes:

[0031] Based on determining that the engine operation satisfies a preset stable condition, the step of obtaining the camshaft angle information, the valve mechanism lift information, and the at least one sliding sleeve movement distance information is triggered.

[0032] Optionally, in the above method, the processing of the camshaft angle information, the valve mechanism lift information and the at least one sliding sleeve movement distance information of the engine to obtain a processing result includes:

[0033] Based on a preset integration condition, the camshaft rotation angle information, the valve mechanism lift information and the at least one sliding sleeve movement distance information are integrated to obtain an integration result;

[0034] The integration result is outputted.

[0035] A variable valve lift engine operation measurement device, comprising:

[0036] A generating module, used for generating a driving signal, wherein the driving signal is used for driving a driver of the engine to rotate and a variable valve lift actuator to perform a pin extension action, wherein the rotation of the driver drives a camshaft core shaft of the engine to rotate to drive a valve mechanism to move, and a pin extended by the variable valve lift actuator follows a spiral groove of a sliding sleeve to rotate to drive at least one sliding sleeve to move along the camshaft core shaft, and the sliding sleeve is arranged corresponding to a cylinder in the engine;

[0037] An acquisition module, used to obtain the camshaft rotation angle information, the lift information of the valve mechanism and the movement distance information of the at least one sliding sleeve;

[0038] The processing module is used to process the camshaft angle information of the engine, the lift information of the valve mechanism and the moving distance information of the at least one sliding sleeve to obtain a processing result.

[0039] In summary, the present application provides an operation measurement system for a variable valve lift engine, comprising: a control device, a measuring device set, and a variable valve lift engine; wherein the engine comprises: at least one cylinder, a driver, a camshaft, a valve mechanism, the camshaft comprising a camshaft core shaft and at least one sliding sleeve, the sliding sleeve being slidably connected to the camshaft core shaft, and the sliding sleeve being arranged corresponding to the cylinder; wherein the control device is used to generate a drive signal, the drive signal being used to drive the driver to rotate and control the variable valve mechanism lift actuator to extend a pin; wherein the driver rotates to drive the camshaft core shaft of the engine to rotate to promote the movement of the valve mechanism, and the pin extended by the variable valve mechanism lift actuator follows the spiral groove of the sliding sleeve to rotate to promote the at least one sliding sleeve to move along the camshaft core shaft; wherein the measuring device set comprises an angle measuring device and a distance measuring device, the angle measuring device being used to measure the camshaft rotation angle information, and the distance measuring device being used to measure the lift information of the valve mechanism and the displacement information of the at least one sliding sleeve. In this embodiment, by setting up a set of measuring devices, the camshaft angle of the engine, the lift of the valve mechanism and the displacement of each sliding sleeve in the engine are measured, thereby achieving an accurate understanding of the engine operation condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work.

[0041] Figure 1 It is a structural schematic diagram of a variable valve lift engine operation measurement system embodiment 1 provided by the present application;

[0042] Figure 2 It is a schematic diagram of a valve train 400 used in a variable valve lift engine in Embodiment 1 of an operation measurement system for a variable valve lift engine provided by the present application;

[0043] Figure 3 It is a schematic diagram of the driving principle of the sliding sleeve in Embodiment 1 of an operation measurement system for a variable valve lift engine provided by the present application;

[0044] Figure 4 It is a schematic diagram of the limiting principle of the sliding sleeve in Embodiment 1 of an operation measurement system for a variable valve lift engine provided by the present application;

[0045] Figure 5 It is a structural schematic diagram of a laser displacement sensor in Embodiment 2 of an operation measurement system for a variable valve lift engine provided by the present application;

[0046] Figure 6 It is a structural schematic diagram of a sleeve displacement measurement structure 202 in Embodiment 2 of an operation measurement system for a variable valve lift engine provided by the present application;

[0047] Figure 7 It is a structural schematic diagram of a displacement measurement unit 2021 in Embodiment 2 of an operation measurement system for a variable valve lift engine provided by the present application;

[0048] Figure 8 It is a schematic diagram of the structure of the sleeve displacement measurement structure and the valve mechanism plug-in connection in Embodiment 2 of the variable valve lift engine operation measurement system provided by the present application;

[0049] Fig. 9 It is another structural schematic diagram of the sleeve displacement measurement structure 202 in Embodiment 2 of the variable valve lift engine operation measurement system provided by the present application;

[0050] Fig.10 It is a schematic diagram of the camshaft cover structure in Embodiment 3 of an operation measurement system for a variable valve lift engine provided by the present application;

[0051] Fig.11It is a structural schematic diagram of a sleeve displacement measurement structure in Embodiment 33 of an operation measurement system for a variable valve lift engine provided by the present application;

[0052] Fig.12 It is a schematic diagram of the installation of the sleeve displacement measurement structure and the camshaft cover in Embodiment 3 of the variable valve lift engine operation measurement system provided by the present application;

[0053] Fig.13 It is a flow chart of Embodiment 1 of an operation measurement method of a variable valve lift engine provided by the present application;

[0054] Fig.14 It is a schematic diagram of integrated results in Example 1 of an operation measurement method for a variable valve lift engine provided by the present application;

[0055] Fig.15 is a flow chart of Embodiment 2 of an operation measurement method for a variable valve lift engine provided by the present application;

[0056] Fig.16 It is a structural schematic diagram of an embodiment of an operation measurement device for a variable valve lift engine provided by the present application;

[0057] Fig.17 This is a schematic diagram of an application scenario of an operation measurement system for a variable valve lift engine provided in the present application. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0059] like Figure 1 The figure is a schematic diagram of a structure of a variable valve lift engine operation measurement system embodiment 1 provided by the present application, comprising the following structures: a control device 100, a measurement device assembly 200 and a variable valve lift engine 300;

[0060] The engine includes: at least one cylinder and a valve mechanism and other structures.

[0061] It should be noted that this application mainly detects the camshaft angle information, the engine valve lift and the displacement of the sliding sleeve. Therefore, the engine components introduced in this application only describe the parts related to the camshaft and the valve mechanism, and other parts of the engine are not restricted.

[0062] The valve mechanism comprises a driver, a camshaft, a valve mechanism, the camshaft comprises a camshaft core shaft and at least one sliding sleeve, the sliding sleeve is slidably connected to the camshaft core shaft, and the sliding sleeve is arranged corresponding to the cylinder;

[0063] The engine includes one or more cylinders, one cylinder is a single-cylinder engine, and multiple cylinders are multi-cylinder engines, such as a 4-cylinder engine.

[0064] The sliding sleeves are arranged in one-to-one correspondence with the cylinders. If it is a single-cylinder engine, only one sliding sleeve is required. If it is a 4-cylinder engine, one sliding sleeve is arranged for each cylinder.

[0065] Among them, the camshaft core shaft, sliding sleeve and valve mechanism are partial components of the engine valve mechanism.

[0066] Wherein, the control device 101 is used to generate a drive signal, and the drive signal is used to drive the driver to rotate and control the variable valve lift actuator to extend the pin;

[0067] wherein the driver rotates to drive the camshaft core shaft of the engine to rotate to drive the valve mechanism to move, the pin extended from the variable valve mechanism lift actuator follows the spiral groove of the sliding sleeve to rotate to drive the at least one sliding sleeve to move along the camshaft core shaft, and the sliding sleeve is arranged corresponding to the cylinder in the engine;

[0068] The measuring device set includes an angle measuring device and a distance measuring device, the angle measuring device is used to measure the camshaft angle information, and the distance measuring device is used to measure the lift information of the valve mechanism and the displacement information of the at least one sliding sleeve.

[0069] The rotation of the driver drives the camshaft of the engine to rotate, thereby driving the valve mechanism to move, specifically, driving the valves in the valve mechanism to move, so that the lift of the valve mechanism changes.

[0070] In a specific implementation, the driver may be a driving motor.

[0071] Among them, a pin is arranged on the variable valve lift actuator. After the pin is extended, it rotates along with the spiral groove of the sliding sleeve, thereby pushing the sliding sleeve on the camshaft to move.

[0072] The angle measuring device in the measuring device set measures the rotation angle of the camshaft, and the angle measuring device may be an angle sensor.

[0073] In a specific implementation, the angle sensor may be a Hall sensor.

[0074] Among them, the angle sensor can install a signal wheel on the output shaft of the drive motor or the connecting tooling of the camshaft, and the installation angle of the signal wheel needs to be consistent with the cam phase of the camshaft. When the drive motor is working, the angle sensor outputs an electrical signal for the control device to determine the speed of the drive motor and the camshaft phase angle. The camshaft phase angle signal is the only reference for the control device to control the working time of the solenoid valve of the variable valve lift actuator, and is also the phase reference of the entire system.

[0075] Among them, the valve mechanism specifically includes valves, valve springs, roller rocker arms, hydraulic tappets, valve lock clamps, spring seats, etc.

[0076] like Figure 2 Shown is a schematic diagram of the valve mechanism 400 used in the variable valve lift engine in the present application, including: a camshaft 401, a sliding sleeve 402, a variable valve lift actuator 403, a thrust spring 404, a thrust steel ball 405, a hydraulic tappet 406, a roller rocker arm 407, a valve 408, a valve spring 409 and a signal wheel 410.

[0077] like Figure 3 What is shown is a schematic diagram of the sliding sleeve driving principle, in which the sliding sleeve 402 and the variable valve lift actuator 403 are included. The sliding sleeve 402 includes an internal spline 402a, a cam group 402b, a spiral groove 402c, and a steel ball groove 402d. The variable valve lift actuator 403 includes a left pin 403a and a right pin 403b.

[0078] In the present application, the variable valve lift actuator in the valve mechanism uses a double-pin VVL actuator as an example for illustration.

[0079] Combination Figure 2 and Figure 3To explain the driving principle of the sliding sleeve, the VVL actuator 403 has two pins 403a on the left and 403b on the right that can be extended. When the coil inside the VVL actuator 403 is energized, the magnetic core will move downward under the action of the electromagnetic force, thereby pushing the pins out; after the coil is de-energized, the downward electromagnetic force disappears, and the spring force inside pushes the pins back. When the left and right pins are both in the retracted state, the feedback voltage is U0; when the left pin 403a is extended, the pin of the left pin has a high voltage feedback output of U2; when the right pin 403b is extended, the pin of the right pin has a low voltage feedback output of U1. After the left pin 403a extends out, it extends into the spiral groove 402c. As the spiral groove 402c rotates clockwise, the pin 403a contacts the side wall of the spiral groove 402c to generate a thrust to the right along the axial direction of the camshaft core shaft 401, thereby realizing the rightward switching movement of the sliding sleeve 402; after the right pin 403b extends out, it extends into the spiral groove 402c. As the spiral groove 402c rotates clockwise, the pin 403b contacts the side wall of the spiral groove 402c to generate a thrust to the left along the axial direction of the camshaft core shaft 401, thereby realizing the leftward switching movement of the sliding sleeve 402. In order to ensure that the sliding sleeve 402 can stop at an appropriate position, the steel ball groove 402d, the spring hole 401b, the thrust spring 404 and the thrust steel ball 405 cooperate with each other to realize the axial positioning of the sliding sleeve 402. When the sliding sleeve 402 moves from right to left, the steel ball groove 402d drives the thrust steel ball 405 to move. Under the restriction of the spring hole 401b, the movement direction is downward, and the thrust spring 404 is compressed; after the thrust steel ball 405 passes the highest point of the steel ball groove 402d, the thrust steel ball 405 moves upward under the drive of the thrust spring 404 until it reaches the lowest point on the right side of the steel ball groove 402d, and the sliding sleeve 402 stops moving. The reverse movement principle of the sliding sleeve 402 is the same. The sliding sleeve 402 moves forward and backward to different positions, and different cam surfaces on the cam group 402b cooperate with the rocker arm roller 407 in sequence, thereby realizing different lift performances of the valve 408.

[0080] like Figure 4 The figure is a schematic diagram of the limiting principle of the sliding sleeve, wherein the camshaft 401 includes an external spline 401a and a spring hole 401b, and the sliding sleeve 402 includes an internal spline 402a, a cam group 402b, a spiral groove 402c, and a steel ball groove 402d.

[0081] Combination Figure 2 and Figure 4Taking a single intake side as an example, the camshaft core shaft 401 transmits the torque transmitted from the camshaft connection tooling to the inner spline 402a through the outer spline 401a, so the camshaft sliding sleeve 402 rotates with the camshaft core shaft 401. During the rotation process, as the cam height increases, the cam group 402b pushes the roller rocker arm 407 in contact with it, and uses the hydraulic tappet 406 as a fulcrum to a certain proportion of the stroke amplification effect by lever principle, pushing the valve 408 to move downward, the valve spring 409 is compressed, and the valve 408 is opened; the cam group 402b continues to rotate, and after the cam passes the highest point, the compressed valve spring 409 releases its elastic force, pushing the valve upward to provide a reset force for the valve to return to its position, thereby closing the valve 408.

[0082] Correspondingly, in the present application, the valve lift information is specifically measured in the form of voltage.

[0083] In summary, the present embodiment provides an operation measurement system for a variable valve lift engine, comprising: a control device, a measurement device assembly, and a variable valve lift engine; wherein the engine comprises: at least one cylinder, a driver, a camshaft, a valve mechanism, the camshaft comprising a camshaft core shaft and at least one sliding sleeve, the sliding sleeve being slidably connected to the camshaft core shaft, and the sliding sleeve being arranged corresponding to the cylinder; wherein the control device is used to generate a driving signal, the driving signal being used to drive the driver to rotate and control the variable valve mechanism lift actuator to extend Pin; wherein, the driver rotates to drive the camshaft core shaft of the engine to rotate to promote the movement of the valve mechanism, and the pin extended by the variable valve mechanism lift actuator follows the spiral groove of the sliding sleeve to rotate to promote the at least one sliding sleeve to move along the camshaft core shaft, and the sliding sleeve is arranged corresponding to the cylinder in the engine; wherein, the measuring device set includes an angle measuring device and a distance measuring device, the angle measuring device is used to measure the camshaft angle information, and the distance measuring device is used to measure the lift information of the valve mechanism and the displacement information of the at least one sliding sleeve. In this embodiment, the camshaft angle of the engine, the lift of the valve mechanism and the displacement of each sliding sleeve in the engine are measured by setting up a measuring device set, so as to achieve an accurate understanding of the engine operation condition.

[0084] The present application provides a variable valve lift engine operation measurement system embodiment 2, the system includes the following structures: a control device 100, a measurement device set 200 and a variable valve lift engine 300;

[0085] Among them, the structure and function of the control device and the variable valve lift engine 300 please refer to the explanation in the aforementioned embodiment, which will not be described in detail in this embodiment.

[0086] In this embodiment, a measurement device set is described.

[0087] The measuring device set includes: a valve lift sensor 201 and a sleeve displacement measuring structure 202;

[0088] Wherein, the valve lift sensor 201 is arranged corresponding to the valve mechanism and is used to measure the lift of the valve mechanism;

[0089] Specifically, the valve lift sensor uses a laser displacement sensor. It should be noted that when using a laser displacement sensor to measure the lift of the valve mechanism, the direction of the emitted laser light beam needs to be perpendicular to the working irradiation surface and consistent with the movement direction of the measured object. A reflective sheet needs to be pasted on the laser irradiation point to ensure the sensitivity of the laser displacement sensor.

[0090] The measuring device assembly further includes a camshaft angle sensor for measuring the rotation angle of the camshaft.

[0091] Among them, Figure 5 What is shown is a schematic diagram of the structure of the laser displacement sensor. The laser displacement sensor 201 includes two ends: a dynamic end 20011 and a static end 2012. The dynamic end 2011 measures the displacement S1 of the valve mechanism, and the static end 2012 measures the vibration displacement S2 of the cylinder head of the cylinder body along the movement direction of the valve mechanism. The difference in displacement between the two at the same time ΔS=S1-S2 is the actual valve mechanism lift without vibration interference.

[0092] Among them, the sleeve displacement measuring structure 202 includes: at least one displacement measuring unit and a displacement guide rail arranged parallel to the camshaft core axis; the displacement measuring unit is arranged corresponding to the sliding sleeve and moves synchronously with the sliding sleeve; the first end of the displacement measuring unit is slidably connected to the displacement guide rail, and the second end is fixed in a relative position with the sliding sleeve, and the relative position is less than a preset distance.

[0093] The number of the displacement measuring units corresponds to the number of sliding sleeves, and each displacement measuring unit moves synchronously with the sliding sleeve. The displacement of the corresponding sliding sleeve can be determined based on the displacement of the displacement measuring unit, thereby realizing the displacement measurement of the sliding sleeve.

[0094] Among them, the displacement guide is arranged parallel to the camshaft core shaft, and accordingly, the displacement measuring unit slidably connected to the displacement guide and the sliding sleeve are slidably connected to the camshaft core shaft, and the second end of the displacement measuring unit is relatively fixedly connected to the sliding sleeve, so that the sliding sleeve and the displacement measuring unit can slide as a whole along the parallel axis formed by the displacement guide and the camshaft core shaft, and the displacement measuring unit and the sliding sleeve move synchronously, and the displacements of the two are the same.

[0095] Among them, Figure 6 The figure shows a schematic diagram of a sleeve displacement measurement structure 202, including: a displacement measurement unit 2021 and a displacement guide rail 2022. The schematic diagram takes three displacement measurement units as an example for explanation. The first end A of the displacement measurement unit is provided with a hole, and the hole cooperates with the displacement guide rail to realize the slidable connection between the displacement measurement unit and the displacement guide rail. The second end B of the displacement measurement unit is used to be fixedly connected with the sliding sleeve, so that the second end of the displacement measurement unit can be driven to move synchronously when the sliding sleeve moves. Under the restriction of the displacement guide rail, the displacement measurement unit reciprocates along the axial direction of the displacement guide rail.

[0096] Optionally, the sliding sleeve comprises a first cam group and a second cam group, wherein a gap is provided between the first cam group and the second cam group and the first cam group and the second cam group slide along the cam shaft;

[0097] The second end of the displacement measuring unit comprises a connection area, and the connection area is plugged into the gap.

[0098] Wherein, a sliding sleeve includes two adjacent cam groups, and there is a preset space interval between the two cam groups. The two cam groups are slidably connected to the camshaft core shaft, and the cam group slides along the camshaft core shaft.

[0099] In order to realize the fixed connection between the displacement measuring unit and the corresponding sliding sleeve, a connecting area is provided at the second end of the displacement measuring unit, and the connecting area is plugged into the sliding sleeve, specifically, plugged into the space between the first cam group and the second cam group.

[0100] like Figure 7 The structure diagram of the displacement measuring unit 2021 is shown, which includes: a connection area 20211, a connection member 20212 and a sliding member 20213. The sliding member, as the first end of the displacement measuring unit, cooperates with the displacement guide rail to realize the slidable connection between the displacement measuring unit and the displacement guide rail; the connection member connects the sliding member and the connection area; the connection area is composed of two parallel strip structures.

[0101] like Figure 8 What is shown is a structural schematic diagram of the connection between the sleeve displacement measuring structure and the valve mechanism. In this schematic diagram, there are four displacement measuring units 2021. Correspondingly, there are also four sliding sleeves 402 in the valve mechanism. Each sliding sleeve includes two cam groups 402b. The connection area of ​​the displacement measuring unit is plugged in between the cam groups 402b of the sliding sleeve.

[0102] Specifically, the width of the connection area can be adjusted according to the actual clearance of the cam group 702b, and the two are clearance-matched.

[0103] In specific implementation, the gap amount needs to be controlled to between 0.01-0.05 mm, and the roughness and verticality of the side of the cam group 702b require higher processing requirements.

[0104] Optionally, the sleeve displacement measurement structure further includes:

[0105] The displacement signal output terminal 2023 is used to obtain the displacement information of the at least one displacement measuring unit, wherein the displacement information represents the displacement of the sliding sleeve corresponding to the displacement measuring unit.

[0106] The displacement information of each displacement measuring unit is transmitted to the displacement signal output end, and the displacement signal output end sends the displacement information to the control device.

[0107] Generally, the displacement signal output end is arranged at one end of the sleeve displacement measurement structure to reduce the complexity of the structure.

[0108] like Fig. 9 Another schematic diagram of the sleeve displacement measurement structure 202 is shown, which includes: a displacement measurement unit 2021, a displacement guide rail 2022 and a displacement signal output terminal 2023. The schematic diagram takes four displacement measurement units as an example. The displacement measurement units are distributed on the displacement guide rail, and the displacement signal output terminal is set at one end of the displacement guide rail.

[0109] In summary, in the operation measurement system of a variable valve lift engine provided in this embodiment, the distance measuring device includes: a valve lift sensor and a sleeve displacement measuring structure; the valve lift sensor is arranged corresponding to the valve mechanism and is used to measure the lift of the valve mechanism; the sleeve displacement measuring structure includes: at least one displacement measuring unit and a displacement guide rail arranged parallel to the camshaft core shaft; the displacement measuring unit is arranged corresponding to the sliding sleeve and moves synchronously with the sliding sleeve; the first end of the displacement measuring unit is slidably connected to the displacement guide rail, and the relative position of the second end and the sliding sleeve is fixed, and the relative position is less than a preset distance. In this embodiment, the lift of the valve mechanism is measured by the valve lift sensor, and the displacement of the corresponding sliding sleeve is measured respectively by the displacement measuring unit in the sleeve displacement measuring structure, so that the displacement of the sliding sleeve in a single-cylinder or multi-cylinder engine can be monitored separately, and sufficient data support is provided for the simulation verification calculation related to the sliding sleeve.

[0110] The present application provides a variable valve lift engine operation measurement system embodiment 3, the system includes the following structures: a control device 100, a measurement device set 200 and a variable valve lift engine 300;

[0111] Among them, the structure and function of the control device please refer to the explanation in the aforementioned embodiment, which will not be described in detail in this embodiment.

[0112] The variable valve lift engine includes at least one cylinder and a valve mechanism.

[0113] The valve mechanism includes a driver, a camshaft and a valve mechanism.

[0114] Wherein, the variable valve lift engine further comprises: a camshaft cover;

[0115] The camshaft is arranged on one side of the camshaft cover, and the displacement guide rail of the sleeve displacement measuring structure is arranged on the other side of the camshaft cover;

[0116] The camshaft cover is provided with at least one opening corresponding to the at least one displacement measuring unit, and the relative position of the second end of the displacement measuring unit and the sliding sleeve is fixed through the opening.

[0117] The camshaft cover is used to protect the camshaft and the structure installed thereon.

[0118] Specifically, the sliding sleeve installed on the camshaft is on one side (or called the inner side) of the camshaft cover. Since the space inside the camshaft cover is small, the sleeve displacement measurement structure is arranged on the other side of the camshaft cover.

[0119] Specifically, an opening is provided in the camshaft cover so that the second end of the displacement measuring unit enters the inner side of the camshaft cover through the opening to be relatively fixedly connected with the sliding sleeve inside the camshaft cover.

[0120] The size of the opening matches the size of the displacement measuring unit and the range of the reciprocating motion of the displacement measuring unit.

[0121] In a specific implementation, the width of the opening is slightly larger than the thickness of the sliding member in the displacement measuring unit, so that the sliding member can only reciprocate in the opening along the axial direction of the camshaft.

[0122] like Fig.10 The camshaft cover structure schematic diagram is shown, which is a side view of the camshaft cover 500. A camshaft 401 and a sliding sleeve 402 are arranged on one side of the camshaft cover 500. A sleeve displacement measuring structure 202 is arranged on the other side of the camshaft cover. The sleeve displacement measuring structure includes: a displacement measuring unit 2021 and a displacement guide rail 2022. The camshaft cover is provided with openings 501, the number of which is the same as the number of the displacement measuring units, and the displacement measuring unit is plugged into the sliding sleeve through the openings.

[0123] It should be noted that Fig.10The openings shown are only those provided on the camshaft cover for the sleeve displacement measurement structure. In a specific implementation, other functional openings may also be provided on the camshaft cover. The present application does not limit the number and function of the openings on the camshaft cover.

[0124] The sleeve displacement measurement structure is fixedly connected to the physical structure on the engine to ensure the accuracy of the measurement.

[0125] In a specific implementation, the variable valve mechanism lift actuator is also fixed on the camshaft cover to fix the variable valve lift actuator.

[0126] Optionally, the camshaft cover is fixedly connected to the sleeve displacement measuring structure.

[0127] Optionally, the sleeve displacement measuring structure is fixedly connected to the engine cylinder head.

[0128] Specifically, a connecting piece is provided on the sleeve displacement measuring structure, and a corresponding connecting structure is provided on the camshaft cover.

[0129] Specifically, the connecting member may be a flange, and correspondingly, a corresponding opening is provided on the camshaft cover so as to fix the connecting member and the camshaft cover together by bolts.

[0130] like Fig.11 The schematic diagram of the structure of the sleeve displacement measurement structure shown includes: a displacement measurement unit 2021, a displacement guide rail 2022, a displacement signal output terminal 2023 and a connector 2024. There are four connectors in the schematic diagram, and the connectors are arranged between each displacement measurement unit and at the end of the displacement guide rail to ensure that each displacement measurement unit is not affected by other displacement measurement units and the displacement guide rail. The schematic diagram uses four connectors as an example for explanation, and the number of the connectors is not limited.

[0131] like Fig.12 The figure shows the installation diagram of the sleeve displacement measurement structure and the camshaft cover, which is a partial area diagram. The camshaft cover 500 is provided with an opening 501. The displacement measurement unit 2021 of the sleeve displacement measurement structure 202 passes through the opening and enters one side of the camshaft cover to be plugged with the sliding sleeve. The displacement guide rail 2022 is fixedly connected to the camshaft cover through the connecting piece 2024.

[0132] Of course, in a specific implementation, any physical structure on the engine can be used as a fixed sleeve displacement measurement structure, without being limited to a camshaft cover or an engine cylinder head.

[0133] In summary, in a variable valve lift engine operation measurement system provided in this embodiment, the engine further includes: a camshaft cover; the camshaft is arranged on one side of the camshaft cover, and the displacement guide rail of the sleeve displacement measurement structure is arranged on the other side of the camshaft cover; the camshaft cover is provided with at least one opening corresponding to the at least one displacement measurement unit, and the second end of the displacement measurement unit is fixed in relative position with the sliding sleeve through the opening. In this embodiment, a sleeve displacement measurement structure is arranged on the outside of the camshaft cover of the engine, and an opening is arranged on the camshaft cover, so that the second end of the displacement measurement unit in the sleeve displacement measurement structure is fixed in relative position with the sliding sleeve through the opening, and even if the space inside the camshaft cover is small, it is possible to achieve separate measurement of the displacement of each sliding sleeve.

[0134] Corresponding to the above-mentioned embodiment of an operation measurement system of a variable valve lift engine provided by the present application, the present application also provides an embodiment of a method applied to the operation measurement system of the variable valve lift engine.

[0135] like Fig.13 The figure is a flow chart of a variable valve lift engine operation measurement method embodiment 1 provided by the present application. The method is applied to an electronic device, which serves as a control device in the operation measurement system of the variable valve lift engine. The method includes the following steps:

[0136] Step S1301: generating a driving signal;

[0137] The control device generates a driving signal to drive the transmitter to operate.

[0138] Specifically, the drive signal is used to drive the driver to rotate and drive the variable valve lift actuator to perform a pin extension action.

[0139] Among them, different driving signals can control the driver to rotate at different speeds.

[0140] The rotation of the driver drives the camshaft of the engine to rotate to promote the movement of the valve.

[0141] The pin extending from the variable valve lift actuator rotates following the spiral groove of the sliding sleeve to push each sliding sleeve to move along the camshaft core shaft, and the sliding sleeve is arranged corresponding to the cylinder in the engine.

[0142] In a specific implementation, the control device may be a device with strong data processing capabilities.

[0143] Step S1302: obtaining camshaft angle information of the engine, lift information of the valve mechanism, and movement distance information of the at least one sliding sleeve;

[0144] Among them, each measuring device in the measuring device set in the operation measurement system of the variable valve lift engine respectively measures the camshaft angle of the engine, the valve mechanism lift of the engine and the moving distance of the sliding sleeve.

[0145] Wherein, based on the information transmission path between the control device and the measuring device, the measuring device uploads the measured information to the control device.

[0146] In a specific implementation, based on a set time period, the camshaft angle information, valve mechanism lift information and the movement distance information of the at least one sliding sleeve for a period of time during the operation of the engine are obtained.

[0147] Among them, the value of the time period can be set according to the processing capacity, storage capacity, etc. of the control device, and this application does not limit the value.

[0148] Step S1303: Processing the camshaft angle information of the engine, the lift information of the valve mechanism, and the moving distance information of the at least one sliding sleeve to obtain a processing result.

[0149] Wherein, based on the preset processing conditions, the obtained information is processed to obtain the processing result.

[0150] Specifically, different processing conditions can be set according to different scenarios to obtain corresponding processing results.

[0151] The step S1303 includes the following steps:

[0152] Step S13031: Based on a preset integration condition, the camshaft rotation angle information, the valve mechanism lift information, and the movement distance information of the at least one sliding sleeve are integrated to obtain an integration result;

[0153] The integration is to integrate the camshaft rotation angle information, valve mechanism lift information and at least one sliding sleeve movement distance information to be integrated into the same image.

[0154] Specifically, during the integration process, the time base / angle base of all information needs to be consistent to obtain a signal image.

[0155] It should be noted that the information to be integrated can be selected according to actual conditions, and the information can be processed separately or in combination, and there is no restriction on integrating all the obtained information.

[0156] Step S13032: Output the integration result.

[0157] The integration result is output as display content so that users or technicians can intuitively and quickly see various information when the engine is running.

[0158] It should be noted that the camshaft angle information measured by the angle measuring device is a phase signal, which is the horizontal coordinate reference of the display terminal. The timing for extending the pin of the variable valve lift actuator is determined based on the phase signal. The variable valve lift actuator is controlled by program to avoid extending the pin during the opening process of the valve mechanism.

[0159] like Fig.14 Shown is a schematic diagram of the integrated results, including: valve lift, variable valve lift actuator output voltage, sliding sleeve displacement, and camshaft angle.

[0160] from Fig.14 It can be seen that: according to the working time and feedback voltage of the variable valve lift actuator, it is possible to determine when the sliding sleeve starts to switch and the switching direction; immediately afterwards, the sliding sleeve displacement signal changes, proving that the sliding sleeve starts to move; the feedback signal of the laser displacement sensor can clearly determine the lift state of the valve mechanism after switching and determine whether the previous switch is successful. If the valve lift signal of the valve mechanism does not change after switching or a signal between high and low lift appears, it means that the valve mechanism lift switch is unsuccessful.

[0161] In a specific implementation, the rotation speed of the driver is controlled by adjusting the driving signal, and the displacement process of the sliding sleeve 702 at different rotation speeds is studied. The following contents can be determined through the curve state of the displacement signal and the displacement amount:

[0162] (1) Whether the driving stroke of the spiral groove 702c is reasonable;

[0163] (2) Whether the clearance between the spiral groove 702c and the pin of the VVL actuator 703 is appropriate;

[0164] (3) Whether the profile of the steel ball groove 702d needs to be optimized;

[0165] (4) What is the regularity of the sliding stroke of the sliding sleeve 702 at different rotation speeds?

[0166] In this application, the sliding sleeve displacement is integrated with the valve mechanism lift signal to determine the influence of the sliding sleeve on the valve mechanism lift and the valve mechanism when the sliding stroke is too long or too short. At the same time, the sliding sleeve displacement data obtained can be verified with the CAE (Computer Aided Engineering) simulation calculation results to improve the development efficiency of the variable valve mechanism lift camshaft and ensure the development quality of the product.

[0167] In summary, the present embodiment provides a method for measuring the operation of a variable valve lift engine, comprising: generating a drive signal, the drive signal is used to drive the engine's driver to rotate and drive the variable valve lift actuator to perform a pin extension action, the driver rotation drives the engine's camshaft to rotate to drive the valve mechanism to move, the pin extended by the variable valve lift actuator follows the spiral groove of the sliding sleeve to rotate to drive at least one sliding sleeve to move along the camshaft core shaft, and the sliding sleeve is arranged corresponding to the cylinder in the engine; obtaining the engine's camshaft angle information, the valve mechanism lift information, and the movement distance information of the at least one sliding sleeve; processing the engine's camshaft angle information, the valve mechanism lift information, and the movement distance information of the at least one sliding sleeve to obtain a processing result. In the present embodiment, the variable valve lift engine operation measurement system is used to set a measurement device set on the engine to measure the engine's camshaft angle, valve mechanism lift, and displacement of multiple sliding sleeves, thereby achieving an accurate understanding of the engine's operation.

[0168] like Fig.15 The figure is a flow chart of a second embodiment of a method for measuring the operation of a variable valve lift engine provided by the present application, and the method comprises the following steps:

[0169] Step S1501: generating a driving signal;

[0170] Among them, step S1501 is consistent with the corresponding step in Example 1 and is not described in detail in this embodiment.

[0171] Step S1502: determining whether the engine operation meets a preset stability condition;

[0172] Among them, the stable operation of the engine is the basis for ensuring the accuracy of the measurement results. Therefore, before obtaining the measurement information of the measurement device set, it is determined whether the engine operation is stable.

[0173] In a specific implementation, the judgment can be made based on the engine output power. Stable output power indicates that the engine is running stably. Alternatively, the judgment can be made based on the running time of the engine based on the drive signal. If the running time is greater than a certain agreed time threshold, the engine is determined to be running stably.

[0174] Among them, the agreed duration threshold can be set according to actual conditions, and this application does not limit its value.

[0175] If the engine operation meets the preset stability condition, step S1503 is triggered; otherwise, wait.

[0176] Step S1503: obtaining camshaft angle information of the engine, lift information of the valve mechanism in the engine, and movement distance information of the at least one sliding sleeve;

[0177] Step S1504: Process the camshaft angle information of the engine, the lift information of the valve mechanism, and the moving distance information of the at least one sliding sleeve to obtain a processing result.

[0178] Among them, steps S1503-1504 are consistent with the corresponding steps in Example 1 and are not repeated in this embodiment.

[0179] In summary, the operation measurement method of a variable valve lift engine provided in this embodiment also includes: based on the engine operation satisfying a preset stability condition, triggering the step of obtaining the engine's camshaft angle information, the lift information of the valve mechanism in the engine, and the movement distance information of the at least one sliding sleeve, thereby ensuring that the measurement is performed under the premise of stable operation of the engine with high accuracy.

[0180] Corresponding to the above-mentioned embodiment of the operation measurement method of a variable valve lift engine provided by the present application, the present application also provides an embodiment of a device applying the operation measurement method of a variable valve lift engine.

[0181] like Fig.16 The structure diagram of an embodiment of a variable valve lift engine operation measurement device provided by the present application is shown. The device is applied to an electronic device, and the electronic device is used as a control device in the operation measurement system of the variable valve lift engine. The device includes the following structures: a generating module 1601, an obtaining module 1602 and a processing module 1603;

[0182] The generating module is used to generate a driving signal, wherein the driving signal is used to drive the engine driver to rotate and the variable valve lift actuator to perform a pin extension action, wherein the rotation of the driver drives the camshaft of the engine to rotate to drive the valve mechanism to move, and the pin extended by the variable valve lift actuator follows the spiral groove of the sliding sleeve to rotate to drive at least one sliding sleeve corresponding to at least one cylinder in the engine to move;

[0183] Wherein, the obtaining module is used to obtain the camshaft rotation angle information, the lift information of the valve mechanism and the moving distance information of the at least one sliding sleeve;

[0184] The processing module is used to process the camshaft angle information of the engine, the lift information of the valve mechanism and the moving distance information of the at least one sliding sleeve to obtain a processing result.

[0185] Optionally, also include:

[0186] The judging module is used to judge whether the operation of the engine satisfies a preset stability condition, and trigger the obtaining module based on determining that the operation of the engine satisfies the preset stability condition.

[0187] Optionally, the processing module is specifically used for:

[0188] Based on a preset integration condition, the camshaft rotation angle information, the valve mechanism lift information, and the movement distance information of the at least one sliding sleeve are integrated to obtain an integration result;

[0189] The integration result is outputted.

[0190] It should be noted that for the functional explanation of each structure in the operation measurement device of a variable valve lift engine provided in this embodiment, please refer to the explanation in the aforementioned method embodiment, and it will not be repeated in this embodiment.

[0191] In summary, the present embodiment provides an operation measurement device for a variable valve lift engine, which measures the camshaft angle of the engine, the lift of the valve mechanism, and the displacement of multiple sliding sleeves through a set of measurement devices arranged on the engine by the operation measurement system of the variable valve lift engine, thereby achieving accurate understanding of the engine operation conditions.

[0192] Corresponding to the above-mentioned embodiments of an operation measurement system, method and device of a variable valve lift engine provided by the present application, the present application also provides an application scenario embodiment of the operation measurement system of the variable valve lift engine.

[0193] like Fig.17 What is shown is a schematic diagram of an application scenario of an operation measurement system of a variable valve lift engine, in which the application scenario includes a control device 100, a measurement device set 200, and a variable valve lift engine 300.

[0194] In this application scenario, the driver in the variable valve lift engine 300 adopts a drive motor.

[0195] The control device 100 is a laptop computer; the measuring device assembly 200 includes a valve lift sensor 201, a sleeve displacement measuring structure 202 and a camshaft angle sensor 203;

[0196] The variable valve lift engine 300 includes: a drive motor 3001, a camshaft connection tool 3002, a side sealing plate 3003, a cylinder head 3004, a test connection base plate 3005, a base plate bracket 3006, a valve mechanism 400, and a camshaft cover 500.

[0197] Among them, the drive motor provides driving force for the rotation of the camshaft and the opening of the valve mechanism, and rotates clockwise when viewed from the right side; the position of the drive motor is fixed separately and can be flexibly adjusted according to the position of the camshaft. The camshaft connection tooling connects the drive motor and the camshaft mandrel, transmits the torque of the drive motor, and drives the camshaft to rotate; before installing the side sealing plate, apply metal sealant on the lower plane and the right plane, install it vertically with the test connection base plate, and use the sealant to prevent oil leakage. Install it tightly with the camshaft cover and the front end of the cylinder head, tighten the bolts, and the side sealing plate and the camshaft connection tooling form a seal; the camshaft cover and cylinder head are assembled according to the engine requirements to provide matching support for the valve mechanism; the test connection base plate is used to fix the cylinder head and provide an interface for external oil circulation for the test bench. The base plate bracket provides a base fixation for the entire measuring device, and the test connection base plate is fixed to the base plate bracket by countersunk bolts.

[0198] The overall measurement process is as follows:

[0199] Step S001: test equipment installation;

[0200] Among them, a series of equipment is expanded outside the engine equipment, including angular position sensors, laser displacement sensors and sleeve displacement measurement structures. The laser sensor position can be flexibly placed, and the sleeve displacement measurement mechanism needs to be specially designed with a fixed flange position according to the actual structure of the engine. The equipment is installed after the power supply harness and signal harness are plugged in place.

[0201] Step S002: Power on and oil the equipment;

[0202] Among them, by turning on the external oil supply system, you can adjust parameters such as oil pressure and oil temperature in advance, and continue to supply oil for 15-30 minutes to check whether there are oil leaks in the device.

[0203] Step S003: equipment debugging;

[0204] Among them, the equipment is powered on, the drive motor 1 is started at low speed, and the angular position feedback signal is checked to see if it is normal; the valve lift actuator is controlled to perform switching action, and the valve mechanism lift data and the displacement data of the sliding sleeve are checked to see if they are normal.

[0205] Step S004: Device parameter setting;

[0206] After confirming that all systems are working properly, set the working cycle of the valve mechanism lift actuator on the computer, set the speed of the drive motor, and start measuring the displacement of the variable valve mechanism lift and the sliding sleeve.

[0207] Step S005: Run measurement.

[0208] During the measurement process, the control computer intercepts 5-30 seconds of signal data and loads the corresponding signal according to actual research needs.

[0209] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device provided in the embodiment, since it corresponds to the method provided in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0210] The above description of the embodiments provided enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features provided herein.

Claims

1. A variable valve lift engine operation measurement system, characterized in that: include: Control device, measuring device assembly, variable valve lift engine; The engine comprises: at least one cylinder, a driver, a camshaft, a valve mechanism, the camshaft comprises a camshaft core shaft and at least one sliding sleeve, the sliding sleeve is slidably connected to the camshaft core shaft, and the sliding sleeve is arranged corresponding to the cylinder; Wherein, the control device is used to generate a drive signal, wherein the drive signal is used to drive the driver to rotate and control the variable valve mechanism lift actuator to extend the pin; wherein the driver rotates to drive the camshaft core shaft of the engine to rotate to drive the valve mechanism to move, and the pin extended from the variable valve mechanism lift actuator rotates following the spiral groove of the sliding sleeve to drive the at least one sliding sleeve to move along the camshaft core shaft; The measuring device set includes an angle measuring device and a distance measuring device, the angle measuring device is used to measure the camshaft angle information, and the distance measuring device is used to measure the lift information of the valve mechanism and the displacement information of the at least one sliding sleeve.

2. The system according to claim 1, characterized in that The distance measuring device comprises: Valve lift sensor and sleeve displacement measurement structure; The valve lift sensor is arranged corresponding to the valve mechanism and is used to measure the lift of the valve mechanism; The sleeve displacement measuring structure includes: at least one displacement measuring unit and a displacement guide rail arranged parallel to the camshaft core shaft; the displacement measuring unit is arranged corresponding to the sliding sleeve and moves synchronously with the sliding sleeve; the first end of the displacement measuring unit is slidably connected to the displacement guide rail, and the second end is fixed in a relative position to the sliding sleeve, and the relative position is less than a preset distance.

3. The system according to claim 2, characterized in that The sliding sleeve comprises a first cam group and a second cam group, wherein a gap is provided between the first cam group and the second cam group and the first cam group and the second cam group slide along the cam shaft core shaft; The second end of the displacement measuring unit includes a connection area, and the connection area is plugged into the gap.

4. The system according to claim 2, characterized in that The sleeve displacement measurement structure further includes: The displacement signal output terminal is used to obtain displacement information of the at least one displacement measuring unit, wherein the displacement information represents the displacement of the sliding sleeve corresponding to the displacement measuring unit.

5. The system according to claim 2, characterized in that The engine further comprises: a camshaft cover; The camshaft is arranged on one side of the camshaft cover, and the displacement guide rail of the sleeve displacement measuring structure is arranged on the other side of the camshaft cover; The camshaft cover is provided with at least one opening, and the opening is provided corresponding to the displacement measuring unit, and the relative position of the second end of the displacement measuring unit and the sliding sleeve is fixed through the opening.

6. The system according to claim 5, characterized in that The camshaft cover is fixedly connected to the sleeve displacement measuring structure.

7. A method for measuring the operation of a variable valve lift engine, characterized in that: Applied to the system according to any one of claims 1 to 6, the method comprises: Generate a drive signal, the drive signal is used to drive the driver of the engine to rotate and drive the variable valve lift actuator to perform a pin extension action, the rotation of the driver drives the camshaft core shaft of the engine to rotate to promote the movement of the valve mechanism, the pin extended by the variable valve lift actuator follows the spiral groove of the sliding sleeve to rotate to promote at least one sliding sleeve to move along the camshaft core shaft, and the sliding sleeve is correspondingly arranged with the cylinder in the engine; Obtaining camshaft angle information of the engine, lift information of the valve mechanism, and movement distance information of the at least one sliding sleeve; The camshaft angle information of the engine, the lift information of the valve mechanism and the moving distance information of the at least one sliding sleeve are processed to obtain a processing result.

8. The method according to claim 7, characterized in that Also includes: Based on determining that the engine operation satisfies a preset stable condition, the step of obtaining the camshaft angle information, the valve mechanism lift information, and the at least one sliding sleeve movement distance information is triggered.

9. The method according to claim 7, characterized in that: The processing of the camshaft rotation angle information, the valve mechanism lift information and the at least one sliding sleeve movement distance information of the engine to obtain a processing result includes: Based on a preset integration condition, the camshaft rotation angle information, the valve mechanism lift information and the at least one sliding sleeve movement distance information are integrated to obtain an integration result; The integration result is outputted.

10. A variable valve lift engine operation measurement device, characterized in that: include: A generating module, used for generating a driving signal, wherein the driving signal is used for driving a driver of the engine to rotate and a variable valve lift actuator to perform a pin extension action, wherein the rotation of the driver drives a camshaft core shaft of the engine to rotate to drive a valve mechanism to move, and a pin extended by the variable valve lift actuator follows a spiral groove of a sliding sleeve to rotate to drive at least one sliding sleeve to move along the camshaft core shaft, and the sliding sleeve is arranged corresponding to a cylinder in the engine; An acquisition module, used to obtain the camshaft rotation angle information, the lift information of the valve mechanism and the movement distance information of the at least one sliding sleeve; The processing module is used to process the camshaft angle information of the engine, the lift information of the valve mechanism and the moving distance information of the at least one sliding sleeve to obtain a processing result.

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