Hydraulic tensioner, control method and vehicle

Abstract

The invention provides a hydraulic tensioner, a control method and a vehicle, the hydraulic tensioner structurally comprises a fixed guide rail arranged on the first side of a timing chain system, and the fixed guide rail is in contact with the first side of the timing chain system; the tensioning guide rail is arranged on the second side of the timing chain system, and the tensioning guide rail can move in the direction close to the fixed guide rail so as to tension the timing chain system; the plunger is arranged on the side portion of the tensioning guide rail, and the plunger can drive the tensioning guide rail to move; and the hydraulic system is connected with the plunger, and the hydraulic system can control the plunger to extend or retract according to a rotating speed signal of an engine. The hydraulic tensioner can solve the problem that in the using process of an existing hydraulic tensioner, an automobile cannot control the tensioning force of a tooth-shaped chain.

Description

Technical Field

[0001] The present application relates to the technical field of automobile engines, and in particular to a hydraulic tensioner, a control method and a vehicle. Background Art

[0002] During the operation of the engine, the engine has extremely strict requirements on the working cycle and ignition sequence of the four cylinders. The various components of the engine need to cooperate accurately to achieve the timing of opening and closing the intake and exhaust valves, so that the combustible mixture or air can enter the cylinder in time, and at the same time meet the requirements of exhaust gas emission. The above functions need to be guaranteed by the timing chain system of the engine. In order to ensure the normal operation of the timing chain system, it is usually necessary to install a tensioning device in the timing chain system. On the one hand, the tensioning device can compensate for the extension of the chain caused by installation errors, high temperature, wear and alternating loads, so that the tension of the timing chain system is maintained in a suitable range, and the service life of the timing chain system is improved; on the other hand, the tensioning device can produce a certain amount of viscous damping, effectively reduce the vibration of the chain, and improve the efficiency of the timing chain system.

[0003] At present, the traditional hydraulic tensioner has a fixed service life because the plunger cannot be retracted after being extended due to the limitation of the ratchet structure. In addition, the extension of the plunger cannot be controlled, and the system cannot sense whether the hydraulic tensioner is in a normal working state. It can be said that the hydraulic tensioner is an independent structural unit and is not controlled by the vehicle controller. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a hydraulic tensioner, a control method and a vehicle, so as to solve the problem that during the use of the existing hydraulic tensioner, the vehicle cannot control the tensioning force of the toothed chain.

[0005] According to a first aspect of the present invention, a hydraulic tensioner is provided, wherein the hydraulic tensioner comprises: a fixed guide rail, arranged on a first side of the timing chain system, the fixed guide rail being in contact with the first side of the timing chain system; a tensioning guide rail, arranged on a second side of the timing chain system, the tensioning guide rail being able to move toward the fixed guide rail to tension the timing chain system; a plunger, arranged on a side of the tensioning guide rail, the plunger being able to drive the tensioning guide rail to move; and a hydraulic system connected to the plunger, the hydraulic system being able to control the extension or shortening of the plunger according to a speed signal of an engine.

[0006] Preferably, the hydraulic system includes: a dual-nozzle flapper servo valve, which is connected to the plunger through a pipeline and is used to control the extension amount of the plunger; and a controller, which can receive a speed signal of the engine of the vehicle, and is conductively connected to the dual-nozzle flapper servo valve, and can output electrical signals to the dual-nozzle flapper servo valve according to the engine speed signal input by the sensor group.

[0007] Preferably, the dual nozzle baffle servo valve includes: a torque motor, which is conductively connected to the controller, and the controller can control the movement of the armature in the torque motor through an electrical signal; a nozzle baffle structure, which is connected to the torque motor, and the torque motor can control the distance between the nozzle and the baffle in the nozzle baffle structure; and a sliding valve, which is connected to the nozzle baffle structure through a pipeline, and the nozzle baffle structure can drive the valve core of the sliding valve to move, and the sliding valve is connected to the plunger through a pipeline, and the sliding valve can control the extension amount of the plunger by flow size and direction.

[0008] Preferably, the vehicle also includes a sensor group, which includes: a speed sensor, which is arranged on the tensioning guide rail, the speed sensor is conductively connected to the controller, and the speed sensor can collect the speed signal of the tensioning guide rail and transmit it to the controller; a displacement sensor, which is arranged on the tensioning guide rail, the displacement sensor is conductively connected to the controller, and the displacement sensor can collect the displacement signal of the plunger and transmit it to the controller; and a pressure sensor, which is arranged between the tensioning guide rail and the plunger, the pressure sensor is conductively connected to the controller, and the pressure sensor can collect the force signal of the plunger and the tensioning guide rail and transmit it to the controller.

[0009] Preferably, a compression spring is arranged in the rod cavity of the plunger.

[0010] Preferably, the hydraulic system further comprises a hydraulic auxiliary system, the hydraulic auxiliary system is connected to the oil inlet of the sliding valve, and the hydraulic auxiliary system is used to ensure the stability of the oil pressure of the hydraulic oil.

[0011] According to a second aspect of the present invention, a control method for a hydraulic tensioner is provided, wherein the hydraulic tensioner is the hydraulic tensioner as described above, and the control method for the hydraulic tensioner comprises: controlling the extension amount of the plunger of the hydraulic tensioner according to the rotation speed of the engine.

[0012] Preferably, the control method of the hydraulic tensioner includes: after the engine is started, transmitting the engine speed signal to the controller; the controller outputs an electrical signal to the dual-nozzle baffle servo valve; the dual-nozzle baffle servo valve controls the extension amount of the plunger according to the electrical signal; the plunger generates pressure on the tensioning rail, thereby driving the tensioning rail to move, so as to cooperate with the fixed rail to tension the timing chain system.

[0013] Preferably, the control method of the hydraulic tensioner also includes: after the plunger generates pressure on the tensioning guide rail, the pressure sensor collects the force signal between the plunger and the tensioning guide rail and transmits it to the controller; after the plunger extends, the displacement sensor collects the displacement signal of the plunger and transmits it to the controller; the controller outputs an electrical signal to the dual-nozzle baffle servo valve for adjustment according to the size of the force signal and the displacement signal.

[0014] According to a second aspect of the present invention there is provided a vehicle, wherein the vehicle comprises the hydraulic tensioner as described above.

[0015] The hydraulic tensioner, control method and vehicle of the embodiment of the present invention, wherein the hydraulic tensioner includes a fixed guide rail arranged on the first side of the timing chain system, and the fixed guide rail is in contact with the first side of the timing chain system. The tensioning guide rail is arranged on the second side of the timing chain system, and the tensioning guide rail can move in a direction close to the fixed guide rail to tension the timing chain system. The plunger is arranged on the side of the tensioning guide rail, and it can drive the tensioning guide rail to move. The hydraulic system is connected to the plunger. The hydraulic system can control the extension or shortening of the plunger according to the engine speed signal to increase the service life of the tensioner and reduce the vibration and noise of the timing system. This can effectively solve the problem that the car cannot control the tensioning force of the toothed chain during the use of the existing hydraulic tensioner.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic diagram of a hydraulic system of a hydraulic tensioner according to the present invention.

[0019] Figure markings: 1-dual nozzle baffle servo valve; 11-torque motor; 12-nozzle baffle structure; 13-sliding valve; 2-controller; 3-plunger; 4-sensor group; 41-speed sensor; 42-displacement sensor; 43-pressure sensor; 5-hydraulic auxiliary system; 6-tensioning guide rail. DETAILED DESCRIPTION

[0020] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0021] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0022] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0023] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0024] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0025] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0026] The terms used herein are only used to describe various examples and are not used to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprising" and "having" list the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0027] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0028] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0029] like Figure 1 As shown, according to a first aspect of the present invention, a hydraulic tensioner is provided, which includes a fixed rail, a tensioning rail 6, a plunger 3 and a hydraulic system.

[0030] In the following description, reference will be made to Figure 1 The specific structure of the above components of the hydraulic tensioner and the connection relationship of the above components are described in detail.

[0031] like Figure 1 As shown, in an embodiment, a fixed guide rail may be disposed on a first side of the timing chain system. The fixed guide rail may be in contact with the first side of the timing chain system. A tensioning guide rail 6 may be disposed on a second side of the timing chain system. The tensioning guide rail 6 may move toward the fixed guide rail to tension the timing chain system. The plunger 3 may be disposed on the side of the tensioning guide rail 6, and the plunger 3 may drive the tensioning guide rail 6 to move. A hydraulic system may be connected to the plunger 3. The hydraulic system may control the extension or shortening of the plunger 3 according to the engine speed signal, and adaptively adjust the tensioning degree of the timing chain system, thereby achieving an increase in the service life of the tensioner and reducing the vibration and noise of the timing system.

[0032] Preferably, in an embodiment, the tensioning rail 6 and the fixed rail can be arranged on opposite sides of the timing chain system. The timing chain system includes three crankshaft sprockets and a toothed chain arranged around the three crankshaft sprockets. Since the position of the crankshaft sprocket is fixed, when the tensioning rail 6 moves toward the fixed rail, the fixed rail can resist the toothed chain on one side of the timing chain system, and the tensioning rail 6 presses the toothed chain on the other side of the timing chain system, so that the timing chain system is tensioned as a whole. Specifically, the two ends of the fixed rail can be fixed to the inside of the engine by bolts, and the tensioning rail 6 can be pivotally fixed to the inside of the engine at one end, and the other end is a movable end, and the movable end of the tensioning rail 6 is connected to the plunger 3. When the plunger 3 is extended, the tensioning rail 6 can drive the toothed chain, thereby achieving tensioning of the timing chain system.

[0033] Preferably, Figure 1 As shown, in an embodiment, the hydraulic system may include a dual nozzle flapper servo valve 1 and a controller 2. The dual nozzle flapper servo valve 1 may be connected to the plunger 3 through a pipeline, and the dual nozzle flapper servo valve 1 may control the extension amount of the plunger 3 through flow. The controller 2 may receive a speed signal of the engine of the vehicle. The controller 2 may be conductively connected to the dual nozzle flapper servo valve 1. Specifically, the controller 2 may output a corresponding electrical signal to the dual nozzle flapper servo valve 1 according to the input engine speed signal, so as to control the extension amount of the plunger 3 through the dual nozzle flapper servo valve 1.

[0034] Further, preferably, Figure 1As shown, in an embodiment, the dual nozzle baffle servo valve 1 may include a torque motor 11, a nozzle baffle structure 12 and a slide valve 13. The torque motor 11 may be conductively connected to the controller 2. The controller 2 may control the movement of the armature in the torque motor 11 through an electrical signal. The nozzle baffle structure 12 may be connected to the torque motor 11. The torque motor 11 may control the distance between the nozzle and the baffle in the nozzle baffle structure 12. The slide valve 13 may be connected to the nozzle baffle structure 12 through a pipeline. The nozzle baffle structure 12 may drive the valve core of the slide valve 13 to move. The slide valve 13 may be connected to the plunger 3 through a pipeline, and the slide valve 13 may control the extension amount of the plunger 3 through the flow size and direction, so that the controller 2 may control the extension amount of the plunger 3 by inputting an electrical signal to the torque motor 11.

[0035] Specifically, during use, when no electrical signal is input to the torque motor 11, the magnetic field of the dual nozzle flapper servo valve 1 is only affected by the permanent magnets on the left and right sides. Since the left and right sides of the dual nozzle flapper servo valve 1 are symmetrical structures, the magnetic flux passing through the armature (the armature is a magnetic conductor) on both sides is the same, and the magnetic field force on the armature is the same. When the controller 2 inputs an electrical signal to the torque motor 11, the armature in the torque motor 11 generates a certain magnetic field. Under the action of the permanent magnet, the magnetic fields of the two are superimposed, resulting in different magnetic fluxes passing through the two sides of the armature, generating different magnetic field forces, thereby generating torque. Therefore, the armature will deflect under the action of the magnetic field force and the elastic force until the magnetic field force on the armature reaches a balance with the elastic force of the spring tube. Due to the offset of the spring tube, the spring tube drives the feedback rod to deflect and bend, thereby changing the gap between the two nozzles and the baffle in the nozzle baffle structure 12, and the pressure of the nozzle chambers on both sides changes.

[0036] Further, in the embodiment, the nozzle baffle structure 12 includes a fixed throttle, nozzles on the left and right sides, and a baffle. The inner diameter of the nozzles on the left and right sides is exactly the same as the size of the nozzle opening, and they share a baffle. The initial distances between the nozzles on both sides and the baffle are the same. When the pressures of the nozzles on both sides are the same, it is called zero-position pressure. When the T-shaped armature is deformed, the initial distances between the nozzles and the baffle become larger and smaller, and the liquid pressures in the control chambers of the nozzles on the left and right sides change to form a pressure difference. This results in different pressures on the left and right sides of the slide valve 13 connected to the nozzle baffle structure 12. The liquid pressure on both sides of the slide valve 13 changes, and the pressure also changes accordingly, forming a pressure difference, which in turn drives the valve core of the slide valve 13 to move until the effect of the liquid pressure offsets the reaction force of the valve core, and the valve core stops moving, thereby achieving the purpose of controlling the output liquid flow rate, and then realizing the control of the extension amount of the plunger 3. That is, the slide valve 13 can control the extension amount of the plunger 3 by controlling the flow rate and direction.

[0037] More preferably, Figure 1As shown, in an embodiment, the sensor group 4 may further include a speed sensor 41, a displacement sensor 42 and a pressure sensor 43. Among them, the speed sensor 41 may be installed on the tensioning guide rail 6. The speed sensor 41 may be conductively connected to the controller 2. The speed sensor 41 is used to collect the speed signal of the tensioning guide rail 6 and transmit it to the controller 2. The displacement sensor 42 may be arranged on the tensioning guide rail 6. The displacement sensor 42 may be conductively connected to the controller 2. The displacement sensor 42 is used to collect the displacement signal of the plunger 3 and transmit it to the controller 2. The pressure sensor 43 may be arranged between the tensioning guide rail 6 and the plunger 3. The pressure sensor 43 may be conductively connected to the controller 2. The pressure sensor 43 is used to collect the force signal between the plunger 3 and the tensioning guide rail 6 and transmit it to the controller 2. Such an arrangement enables the controller 2 to know the movement state and force condition of the tensioning guide rail 6 through the sensor group 4, and then adjust the extension amount of the plunger 3.

[0038] In addition, preferably, in the embodiment, a compression spring may be provided in the rod cavity of the plunger 3, so that the plunger 3 can maintain the basic plunger force after insufficient oil pressure or power failure of the vehicle. In addition, without limitation thereto, the plunger 3 may also be provided with a tension spring in the rodless cavity, that is, as long as the basic plunger force of the plunger 3 can be maintained after insufficient oil pressure or power failure of the vehicle.

[0039] Preferably, Figure 1 As shown, in the embodiment, the hydraulic system may further include a hydraulic auxiliary system 5. The hydraulic auxiliary system 5 may be connected to the oil inlet of the slide valve 13 to ensure the stability of the hydraulic oil pressure. Figure 1 As shown, the hydraulic auxiliary system 5 may include structures such as an oil source, a hydraulic pump, an oil suction filter and an overflow valve. The hydraulic auxiliary system 5 adopts a common setting method in the hydraulic field to provide hydraulic oil with stable oil pressure for the dual-nozzle baffle servo valve 1, which will not be repeated here.

[0040] In addition, according to a second aspect of the present invention, a tensioner control method is provided. The hydraulic tensioner may be the hydraulic tensioner in the above embodiment. The hydraulic tensioner control method includes: controlling the extension amount of the plunger 3 of the hydraulic tensioner according to the rotation speed of the engine.

[0041] Preferably, in an embodiment, the control method of the hydraulic tensioner includes: after the engine is started, the engine speed signal is transmitted to the controller 2; the controller 2 outputs an electrical signal to the dual-nozzle baffle servo valve 1; the dual-nozzle baffle servo valve 1 controls the extension amount of the plunger 3 according to the electrical signal; the plunger 3 generates pressure on the tensioning guide rail 6, thereby driving the tensioning guide rail 6 to move, so as to cooperate with the fixed guide rail tensioning timing chain system.

[0042] Specifically, in the embodiment, the vehicle control unit (VCU) can be conductively connected to the controller 2, and the vehicle control unit transmits the engine speed signal to the controller 2. After the engine speed signal is input, the controller 2 is converted into a weak current signal through program processing and output to the torque motor 11. The electromagnet of the torque motor 11 generates a magnetic field under the action of the current. After superposition with the magnetic field of the permanent magnet, the equilibrium state of the armature is broken, the left and right magnetic fluxes change, and the armature deflects. The spring tube connected to the armature is deformed under the action of the armature, and the gap between the nozzles on the left and right sides to the baffle changes, with the flow rate on one side increasing and the flow rate on the other side decreasing. The change in flow rate causes the fluid pressure of the nozzles on the left and right sides to be different, resulting in a pressure difference, which drives the valve core of the slide valve 13 to deviate. Until the effect of the liquid pressure offsets the reaction force of the valve core, the valve core stops moving. The slide valve 13 controls the extension amount of the plunger 3 by controlling the size and direction of the flow rate. After extending, the plunger 3 drives the movable end of the tensioning guide rail 6 to deflect toward the direction close to the fixed guide rail, so that the tensioning guide rail 6 presses against the toothed chain, thereby achieving tensioning of the timing chain system.

[0043] Preferably, in an embodiment, the control method of the hydraulic tensioner includes: after the plunger 3 generates pressure on the tensioning guide rail 6, the pressure sensor 43 collects the force signal between the plunger 3 and the tensioning guide rail 6 and transmits it to the controller 2; after the plunger 3 extends, the displacement sensor 42 collects the displacement signal of the plunger 3 and transmits it to the controller 2; the controller 2 outputs an electrical signal to the double nozzle flapper servo valve 1 for adjustment according to the magnitude of the force signal and the displacement signal. That is, after the plunger 3 extends, the displacement sensor 42 and the pressure sensor 43 feed back the collected force signal and displacement signal to the controller 2, so that the controller 2 can know the motion state and force condition of the tensioning guide rail 6, and thus adjust and calculate through the PID algorithm, and finally output an electrical signal to the torque motor 11 for adjustment. In this way, the service life of the tensioner can be improved, and the vibration and noise of the timing system can be reduced.

[0044] In addition, according to a third aspect of the present invention, a vehicle is provided, the vehicle comprising the hydraulic tensioner as described above. The vehicle has the same technical effects as the hydraulic tensioner as described above, which will not be described in detail here.

[0045] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A hydraulic tensioner installed in a timing chain system of a vehicle, characterized in that: The hydraulic tensioner comprises: a fixed rail disposed on a first side of the timing chain system, the fixed rail being in contact with the first side of the timing chain system; A tensioning rail, disposed on a second side of the timing chain system, the tensioning rail being capable of moving toward the fixed rail to tension the timing chain system; A plunger is disposed on a side of the tensioning guide rail, and the plunger is capable of driving the tensioning guide rail to move; and A hydraulic system is connected to the plunger, and the hydraulic system can control the extension or shortening of the plunger according to a speed signal of the engine.

2. The hydraulic tensioner according to claim 1, characterized in that: The hydraulic system comprises: A double-nozzle flapper servo valve connected to the plunger through a pipeline and used to control the extension amount of the plunger; and A controller, wherein the controller is capable of receiving a speed signal of the engine of the vehicle, the controller is conductively connected to the dual-nozzle flapper servo valve, and the controller is capable of outputting an electrical signal to the dual-nozzle flapper servo valve according to the engine speed signal input by the sensor group.

3. The hydraulic tensioner according to claim 2, characterized in that: The dual nozzle flapper servo valve comprises: a torque motor, conductively connected to the controller, wherein the controller is capable of controlling the movement of the armature in the torque motor through an electrical signal; a nozzle baffle structure connected to the torque motor, wherein the torque motor is capable of controlling the distance between the nozzle and the baffle in the nozzle baffle structure; and The slide valve is connected to the nozzle baffle structure through a pipeline, the nozzle baffle structure can drive the valve core of the slide valve to move, the slide valve is connected to the plunger through a pipeline, and the slide valve can control the extension amount of the plunger by flow size and direction.

4. The hydraulic tensioner according to claim 3, characterized in that: The vehicle further comprises a sensor group, the sensor group comprising: A speed sensor is arranged on the tensioning guide rail, the speed sensor is conductively connected to the controller, and the speed sensor can collect a speed signal of the tensioning guide rail and transmit it to the controller; A displacement sensor is disposed on the tensioning rail, the displacement sensor is conductively connected to the controller, and the displacement sensor can collect a displacement signal of the plunger and transmit it to the controller; and A pressure sensor is arranged between the tensioning guide rail and the plunger. The pressure sensor is conductively connected to the controller. The pressure sensor can collect the force signal between the plunger and the tensioning guide rail and transmit it to the controller.

5. The hydraulic tensioner according to claim 4, characterized in that: A compression spring is arranged in the rod cavity of the plunger.

6. The hydraulic tensioner according to claim 5, characterized in that: The hydraulic system further comprises a hydraulic auxiliary system, which is communicated with the oil inlet of the slide valve and is used to ensure the stability of the oil pressure of the hydraulic oil.

7. A control method for a hydraulic tensioner, characterized in that: The hydraulic tensioner is the hydraulic tensioner according to any one of claims 4 to 6, and the control method of the hydraulic tensioner includes: controlling the extension amount of the plunger of the hydraulic tensioner according to the rotation speed of the engine.

8. The control method of the hydraulic tensioner according to claim 7, characterized in that: The control method of the hydraulic tensioner comprises: After the engine is started, transmitting a speed signal of the engine to the controller; The controller outputs an electrical signal to the dual-nozzle flapper servo valve; The double nozzle flapper servo valve controls the extension amount of the plunger according to the electrical signal; The plunger generates pressure on the tensioning rail, thereby driving the tensioning rail to move, so as to cooperate with the fixed rail to tension the timing chain system.

9. The control method of the hydraulic tensioner according to claim 8, characterized in that: The control method of the hydraulic tensioner also includes: After the plunger generates pressure on the tensioning guide rail, the pressure sensor collects the force signal between the plunger and the tensioning guide rail and transmits it to the controller; After the plunger extends, the displacement sensor collects the displacement signal of the plunger and transmits it to the controller; The controller outputs an electrical signal to the dual-nozzle flapper servo valve for adjustment according to the magnitudes of the force signal and the displacement signal.

10. A vehicle, characterized in that: The vehicle comprises the hydraulic tensioner of any one of claims 1 to 9.

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