Structure for telescoping glow plug of methanol engine, engine and control method

Abstract

The invention provides a structure for stretching a glow plug of a methanol engine, the engine and a control method. The structure comprises a driving part; the plurality of cams are respectively arranged on the output shaft of the driving part so as to synchronously rotate along with the output shaft; the multiple rocker arms are installed on the rocker arm shafts respectively and are in sliding connection with the cams respectively, the rocker arms rotate around the rocker arm shafts based on rotation of the cams, the glow plug is installed on the side, away from the cams, of the first rocker arm, and the first rocker arm represents the rocker arm corresponding to the cam with the smallest maximum diameter; wherein the first rocker arm is connected with other rocker arms through magnetism so as to drive the glow plug to enter or exit from a combustion chamber of the methanol engine based on rotation of the first cam, and the first cam represents the cam with the largest diameter in the cams corresponding to the rocker arms magnetically connected with the first rocker arm.

Description

Technical Field

[0001] The present disclosure relates to the technical field of methanol engines, and in particular to a structure for a telescopic methanol engine glow plug, a methanol engine and a control method. Background Art

[0002] The auto-ignition temperature of methanol is about 470°C, while that of diesel is about 210°C. The auto-ignition temperature of methanol is much higher than that of diesel. Therefore, it is difficult for methanol to reach the auto-ignition temperature under compression ignition conditions, especially at low temperatures or when the engine is cold started. Furthermore, the latent heat of vaporization of methanol is relatively high, about 1100 kJ / kg, which means that it absorbs a large amount of heat during the vaporization process, which will cause the temperature of the combustion chamber to drop, further increasing the difficulty of methanol auto-ignition.

[0003] In the related art, the glow plug is used to provide additional heat in the combustion chamber of the engine to help methanol reach the auto-ignition temperature, thereby achieving compression ignition. However, the methanol compression ignition engine of the related art still has the disadvantage of a narrow efficient working range and cannot achieve stable combustion under different working conditions. Summary of the invention

[0004] In view of this, the present disclosure provides a structure of a glow plug for a telescopic methanol engine, comprising: a driving part; a plurality of cams, respectively mounted on the output shaft of the driving part to rotate synchronously with the output shaft; a plurality of rocker arms, respectively mounted on the rocker arm shafts and respectively slidably connected to the cams, the rocker arms rotate around the rocker arm shafts based on the rotation of the cams, the glow plug is mounted on a side of a first rocker arm away from the cam, the first rocker arm represents the rocker arm corresponding to the cam with the smallest maximum diameter; wherein the first rocker arm is connected to the other rocker arms by magnetism to drive the glow plug to enter or exit the combustion chamber of the methanol engine based on the rotation of the first cam, the first cam represents the cam with the largest maximum diameter among the cams corresponding to the rocker arms magnetically connected to the first rocker arm.

[0005] Optionally, each of the rocker arms is formed with a connecting hole, the connecting holes of adjacent rocker arms are arranged relatively to each other, a magnetic part is installed in each connecting hole, and adjacent rocker arms are magnetically connected through the magnetic part so that the rocker arms after magnetic connection move synchronously.

[0006] Optionally, the rocker arms at both ends are formed with one connecting hole, and the other rocker arms are formed with two connecting holes; preferably, three cams and three rocker arms are provided.

[0007] Optionally, the minimum diameters of the plurality of cams are the same, and the maximum diameters are different.

[0008] Optionally, the glow plug extends in a direction perpendicular to the first rocker arm.

[0009] Optionally, the plurality of cams extend in the same direction.

[0010] Optionally, the plurality of cams are arranged sequentially along the axial direction of the output shaft based on the maximum diameter.

[0011] Optionally, the glow plug is detachably mounted on the first rocker arm.

[0012] The present disclosure also provides a control method for the structure of a glow plug for a telescopic methanol engine, wherein three cams and three rocker arms are provided, wherein the three cams include a first cam, a second cam and a third cam, and the three rocker arms include a first rocker arm, a second rocker arm and a third rocker arm, wherein the maximum diameter of the first cam is smaller than the maximum diameter of the second cam, and the maximum diameter of the second cam is smaller than the maximum diameter of the third cam, and the control method comprises: in a first working mode, controlling the output shaft of a driving unit to rotate so that the first cam drives the first rocker arm to rotate, so as to drive the glow plug to enter or exit the combustion chamber of the methanol engine, and when the intake air temperature is greater than 0°C, controlling the glow plug to stop heating; when the intake air temperature is less than 0°C, controlling the glow plug to heat the temperature to 600°C during the piston compression stage; or in a second working mode, controlling the output shaft of a driving unit to rotate, and when the rocker arm contacts the cam at the minimum diameter, controlling the first rocker arm to be magnetically connected with the second rocker arm, so that the second cam drives the second rocker arm and the The first rocker arm rotates to drive the glow plug to enter or exit the combustion chamber of the methanol engine. When the intake air temperature is greater than 20°C, the glow plug is controlled to be heated to 700°C; when the intake air temperature is between 0°C and 20°C, the glow plug is controlled to be heated to 800°C; when the intake air temperature is less than 0°C, the glow plug is controlled to be heated to 900°C; or in the third working mode, the output shaft of the driving unit is controlled to rotate, and when the rocker arm contacts the cam at the minimum diameter, the first rocker arm is controlled to contact the second rocker arm. The rocker arms are magnetically connected, and the second rocker arm is magnetically connected to the third rocker arm, so that the third cam drives the third rocker arm, the second rocker arm and the first rocker arm to rotate, so as to drive the glow plug to enter or exit the combustion chamber of the methanol engine; when the intake temperature is greater than 20°C, the glow plug is controlled to be heated to 800°C; when the intake temperature is between 0°C-20°C, the glow plug is controlled to be heated to 1000°C; when the intake temperature is less than 0°C, the glow plug is controlled to be heated to 1200°C.

[0013] The present disclosure also discloses an engine, comprising: the structure of the glow plug for a telescopic methanol engine as described above.

[0014] According to the embodiment of the present disclosure, by providing multiple cams and multiple rocker arms slidably connected to the multiple cams, and installing the glow plug on the first rocker arm with the smallest maximum diameter, the movement amplitude of the first rocker arm can be adjusted by controlling the magnetic connection between the first rocker arm and the other rocker arms, thereby adjusting the length and temperature of the glow plug penetrating into the combustion chamber of the methanol engine, so as to provide additional heat to the combustion chamber to varying degrees, thereby achieving compression ignition of methanol under all operating conditions, and at the same time enhancing combustion stability and combustion efficiency, improving the applicability and working range of the methanol engine, and achieving the purpose of stable combustion under different operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0016] Figure 1 A side view schematically shows the structure of a glow plug for a telescopic methanol engine according to an embodiment of the present disclosure.

[0017] Figure 2 A side view of a cam according to an embodiment of the present disclosure is schematically shown.

[0018] Figure 3 A side view of a cam at another angle according to an embodiment of the present disclosure is schematically shown.

[0019] Figure 4 A side view of a rocker arm according to an embodiment of the present disclosure is schematically shown.

[0020] Figure 5 A side view of a first rocker arm according to an embodiment of the present disclosure is schematically shown.

[0021] Figure 6 A side view of a second rocker arm according to an embodiment of the present disclosure is schematically shown.

[0022] Figure 7 A side view of a third rocker arm according to an embodiment of the present disclosure is schematically shown.

[0023] Figure 8 A side view of a glow plug according to an embodiment of the present disclosure is schematically shown.

[0024] Reference numerals

[0025] 1. Cam;

[0026] 11. The first cam;

[0027] 12. The second cam;

[0028] 13. The third cam;

[0029] 2. Output shaft;

[0030] 3. Rocker arm;

[0031] 31. The first rocker arm;

[0032] 32. Second rocker arm;

[0033] 33. The third rocker arm;

[0034] 4. Rocker arm shaft;

[0035] 5. Glow plug;

[0036] 6. Combustion chamber;

[0037] 7. Connection hole;

[0038] 8. Magnetic parts;

[0039] 81. The first magnetic piece;

[0040] 82. The second magnetic piece;

[0041] 83. The third magnetic piece;

[0042] 84. The fourth magnetic piece;

[0043] 9. Locking ring;

[0044] 10. Lock block. DETAILED DESCRIPTION

[0045] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0046] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0047] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0048] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0049] Figure 1 A side view schematically shows the structure of a glow plug for a telescopic methanol engine according to an embodiment of the present disclosure. Figure 2 A side view of a cam according to an embodiment of the present disclosure is schematically shown. Figure 3 A side view of a cam at another angle according to an embodiment of the present disclosure is schematically shown. Figure 4 A side view of a rocker arm according to an embodiment of the present disclosure is schematically shown.

[0050] like Figure 1-Figure 4 As shown, the embodiment of the present disclosure provides a structure of a glow plug 5 for a telescopic methanol engine. The structure may include a driving part (not shown), a plurality of cams 1 and a plurality of rocker arms 3. The plurality of cams 1 may be respectively mounted on the output shaft 2 of the driving part to rotate synchronously with the output shaft 2. The plurality of rocker arms 3 may be respectively mounted on the rocker arm shaft 4 and respectively connected to the cam 1 in a sliding manner. The plurality of rocker arms 3 may remain parallel. The rocker arm 3 may rotate around the rocker arm shaft 4 based on the rotation of the cam 1, that is, during the rotation of the cam 1, the rocker arm 3 may follow the movement of the cam 1 based on the sliding connection with the cam 1 to rotate around the rocker arm shaft 4. The glow plug 5 may be mounted on a side of the first rocker arm away from the cam 1, so that during the rotation of the first rocker arm, the first rocker arm may drive the glow plug 5 to move. The first rocker arm may represent the rocker arm 3 corresponding to the cam 1 with the smallest maximum diameter. One end of the glow plug 5 away from the first rocker arm may enter the combustion chamber 6 through the glow plug hole of the engine cylinder head.

[0051] Furthermore, the first rocker arm may be connected to the other rocker arms 3 by magnetism, so as to drive the glow plug 5 to enter or exit the combustion chamber 6 of the methanol engine based on the rotation of the first cam. The first cam may represent the cam 1 with the largest maximum diameter among the cams 1 corresponding to the rocker arms 3 magnetically connected to the first rocker arm. Since the maximum diameter of the cam 1 corresponding to the first rocker arm is smaller than the maximum diameter of the other cams 1, the larger the maximum diameter of the cam 1, the larger the amplitude of the movement of the rocker arm 3 corresponding to the cam 1. Therefore, when the first rocker arm is connected to the other rocker arms 3 by magnetism, the first rocker arm will follow the movement of the other rocker arms 3.

[0052] According to the embodiment of the present disclosure, by providing a plurality of cams 1 and a plurality of rocker arms 3 slidably connected to the plurality of cams 1, and installing the glow plug 5 on the first rocker arm with the smallest maximum diameter, the first rocker arm can be magnetically connected to the other rocker arms 3 by controlling the movement amplitude of the first rocker arm, thereby adjusting the length and temperature of the glow plug 5 penetrating into the combustion chamber 6 of the methanol engine, so as to provide additional heat to the combustion chamber 6 to varying degrees, thereby realizing compression ignition of methanol under all operating conditions, and at the same time enhancing combustion stability and combustion efficiency, improving the applicability and working range of the methanol engine, and achieving the purpose of stable combustion under different operating conditions.

[0053] like Figures 1 to 4 As shown, in some embodiments, three cams 1 and three rocker arms 3 may be provided. Under different load conditions, the methanol engine needs the glow plug 5 to provide different additional temperatures. By providing three cams 1, different loads can be realized under different medium, high and low loads. The glow plug 5 can be quickly heated before the engine starts, and by preheating the combustion chamber 6, the start-up time and fuel consumption during startup are reduced, thereby improving the cold start performance. In the medium, high and low load operation stages, the glow plug 5 can help the methanol fuel burn more evenly, reduce the emission of unburned fuel, and improve the combustion efficiency. Through the coupled regulation of the engine load, the length of the glow plug 5 into the combustion chamber, and the temperature of the glow plug 5, the engine can be started and operated at a more suitable temperature, reduce wear, and extend the life of the engine. Further, the number of cams 1 and rocker arms 3 can be set as needed, and is not specifically limited here.

[0054] like Figure 4 As shown, in some embodiments, a connection hole 7 may be formed on each rocker arm 3. The connection holes 7 of two adjacent rocker arms 3 may be arranged opposite to each other. A magnetic member 8 may be installed in each connection hole 7. Two adjacent rocker arms 3 may be magnetically connected through the magnetic member 8, so that the rocker arms 3 after magnetic connection move synchronously. The magnetic member 8 may be an electromagnet.

[0055] Figure 5 A side view of a first rocker arm according to an embodiment of the present disclosure is schematically shown. Figure 6A side view of a second rocker arm according to an embodiment of the present disclosure is schematically shown. Figure 7 A side view of a third rocker arm according to an embodiment of the present disclosure is schematically shown.

[0056] In some embodiments, the rocker arms 3 at both ends may be formed with one connection hole 7, and the remaining rocker arms 3 may be formed with two connection holes 7. The rocker arms 3 may include a first rocker arm 31, a second rocker arm 32, and a third rocker arm 33. The first rocker arm 31 may be characterized as a first rocker arm. Figure 4-7 As shown, the first rocker arm 31 may be formed with a connection hole 7. The second rocker arm 32 may be formed with two connection holes 7. The third rocker arm 33 may be formed with a connection hole 7. The two connection holes 7 of the second rocker arm 32 are respectively arranged corresponding to the connection holes 7 of the first rocker arm 31 and the third rocker arm 33, so that the first rocker arm 31 can be magnetically connected to the second rocker arm 32, and the first rocker arm 31, the second rocker arm 32 and the third rocker arm 33 can be magnetically connected through magnetic connection. Further, the magnetic member 8 may include a first magnetic member 81, a second magnetic member 82, a third magnetic member 83 and a fourth magnetic member 84. The first rocker arm 31 and the second rocker arm 32 can be magnetically connected by using the first magnetic member 81 and the second magnetic member 82. The second rocker arm 32 and the third rocker arm 33 can be magnetically connected by using the third magnetic member 83 and the fourth magnetic member 84.

[0057] In some embodiments, the minimum diameters of the multiple cams 1 may be the same, and the maximum diameters may be different. By setting the minimum diameters of the multiple cams 1 to be the same, it can be ensured that when the rocker arms 3 all move to the position of the minimum diameter of the cam 1, the connection holes 7 of the adjacent rocker arms 3 can be aligned, so that the adjacent rocker arms 3 are magnetically connected. By setting the maximum diameters of the multiple cams 1 to be different, it can be ensured that when the rocker arms 3 are not magnetically connected, different rocker arms 3 have different rotation amplitudes.

[0058] like Figure 1 As shown, in some embodiments, the glow plug 5 may extend in a direction perpendicular to the first rocker arm.

[0059] In some embodiments, multiple cams 1 may extend in the same direction, that is, multiple cams 1 may be installed on the output shaft 2 in the same posture. The arc portions of the cams 1 may overlap. The protrusion of the cam 1 with a larger maximum diameter may cover the protrusion of the cam 1 with a smaller maximum diameter, so that when the rocker arm 3 is magnetically connected, the rocker arm 3 corresponding to the cam 1 with a smaller maximum diameter follows the movement of the rocker arm 3 corresponding to the cam 1 with a larger maximum diameter.

[0060] In some embodiments, a plurality of cams 1 may be arranged in sequence along the axial direction of the output shaft 2 based on the largest diameter. Figure 3As described above, the plurality of cams may be arranged in descending order based on the maximum diameter.

[0061] Figure 8 A side view of a glow plug according to an embodiment of the present disclosure is schematically shown.

[0062] In some embodiments, the glow plug 5 is detachably mounted on the first rocker arm. A locking ring 9 may be provided on the first rocker arm, and a locking block 10 may be provided on the glow plug 5. Based on the cooperation between the locking block 10 and the locking ring 9, the glow plug 5 is detachably mounted on the first rocker arm. The locking ring 9 may be located at an end of the first rocker arm away from the cam 1.

[0063] The disclosed embodiment also provides a control method for combustion support using the structure of the glow plug 5 for a telescopic methanol engine described above. The structure may be provided with three cams 1 and three rocker arms 3. The three cams 1 may include a first cam 11, a second cam 12, and a third cam 13. The three rocker arms 3 may include a first rocker arm 31, a second rocker arm 32, and a third rocker arm 33. The maximum diameter of the first cam 11 is smaller than the maximum diameter of the second cam 12. The maximum diameter of the second cam 12 is smaller than the maximum diameter of the third cam 13. The third cam 13 may be characterized as a first cam. The first cam 11 is slidably connected to the first rocker arm 31, and the second cam 12 is slidably connected to the second rocker arm 32. The third cam 13 is slidably connected to the third rocker arm 33. The control method may include a first working mode, a second working mode, and a third working mode.

[0064] In the first working mode, the output shaft 2 of the driving unit can be controlled to rotate, so that the first cam 11 drives the first rocker arm 31 to rotate, so as to drive the glow plug 5 to enter or exit the combustion chamber 6 of the methanol engine.

[0065] The first working mode may be a high-load operation mode of the engine. Since the injection pressure is high and the injection amount is large at this time, the glow plug 5 is too close to the injector, which may cause premature combustion and worsen emissions. The first cam 11 may be used to drive the first rocker arm 31 to move, so as to drive the glow plug 5 to enter the combustion chamber 6 through the glow plug hole. Since the maximum diameter of the first cam 11 is small, the distance that the glow plug 5 penetrates into the combustion chamber 6 is small at this time. When the intake temperature is greater than 0°C, the glow plug 5 may be controlled to stop heating. When the intake temperature is less than 0°C, the glow plug 5 may be controlled to heat the temperature to 600°C during the piston compression stage.

[0066] In the second working mode, the output shaft 2 of the driving unit can be controlled to rotate, and when the rocker arm 3 contacts the cam 1 at the minimum diameter, the first rocker arm 31 is controlled to be magnetically connected with the second rocker arm 32, so that the second cam 12 drives the second rocker arm 32 and the first rocker arm 31 to rotate, thereby driving the glow plug 5 to enter or exit the combustion chamber 6 of the methanol engine.

[0067] The second working mode can be a medium load operation mode of the engine. When the rocker arm 3 contacts the cam 1 at the minimum diameter, the first magnetic member 81 can be aligned with the second magnetic member 82, so that the first rocker arm 31 and the second rocker arm 32 can be magnetically connected by the first magnetic member 81 and the second magnetic member 82. Since the maximum radius of the second cam 12 is greater than the maximum radius of the first cam 11, the second cam 12 drives the second rocker arm 32 to rotate, thereby driving the first rocker arm 31 to rotate, so that the glow plug 5 enters the combustion chamber 6 through the glow plug hole, and the distance into the combustion chamber 6 is moderate. When the intake temperature is greater than 20°C, the glow plug 517 can be controlled to heat to 700°C. When the intake temperature is between 0°C and 20°C, the glow plug 517 can be controlled to heat to 800°C. When the intake temperature is less than 0°C, the glow plug 517 can be controlled to heat to 900°C.

[0068] In the third working mode, the output shaft 2 of the driving unit is controlled to rotate, and when the rocker arm 3 contacts the cam 1 at the minimum diameter, the first rocker arm 31 is controlled to be magnetically connected with the second rocker arm 32, and the second rocker arm 32 is controlled to be magnetically connected with the third rocker arm 33, so that the third cam 13 drives the third rocker arm 33, the second rocker arm 32 and the first rocker arm 31 to rotate, so as to drive the glow plug 5 to enter or exit the combustion chamber 6 of the methanol engine.

[0069] The third working mode may be a low-load operation mode of the engine. When the rocker arm 3 contacts the cam 1 at the minimum diameter, the first magnetic member 81, the second magnetic member 82 and the third magnetic member 83 may be aligned, so that the first magnetic member 81 and the second magnetic member 82 may be used to magnetically connect the first rocker arm 31 with the second rocker arm 32, and the third magnetic member 83 and the fourth magnetic member 84 may be used to magnetically connect the second rocker arm 32 with the third rocker arm 33, that is, the three rocker arms 3 are in a common connection state. The third cam 13 may be used to drive the third rocker arm 33 to rotate, so as to drive the second rocker arm 32 and the first rocker arm 31 to rotate, so that the glow plug 5 enters the combustion chamber 6 through the glow plug hole, and the glow plug 5 penetrates the combustion chamber 6 to the maximum distance. When the intake air temperature is greater than 20°C, the glow plug 517 may be controlled to heat to 800°C. When the intake air temperature is between 0°C and 20°C, the temperature of the glow plug 517 may be controlled to heat to 1000°C. When the intake air temperature is less than 0°C, the glow plug 517 may be controlled to heat to 1200°C.

[0070] Furthermore, the temperature of the glow plug 5 can be increased by electric heating. However, in the process of reducing the temperature of the glow plug 5, due to the thermal inertia of the glow plug 5, the temperature response time will be delayed, and the cooling fluid in the engine cylinder head can be used to achieve rapid adjustment of the temperature of the glow plug 5.

[0071] During the operation of the engine, the glow plug 5 can be controlled to penetrate into the combustion chamber 6 according to different load conditions based on the above method. In the piston compression stage, when the piston approaches the top dead center, the glow plug 5 can be controlled to penetrate into the combustion chamber 6 by an appropriate distance from the glow plug hole and be heated to the target temperature. In the piston working stage, the electric heating can be cut off and the glow plug 5 can be controlled to exit the combustion chamber 6 through the glow plug hole. At the same time, the engine cylinder head can cool the glow plug 5. By real-time cutting off and heating control of the glow plug 5, the ineffective power output of the glow plug 5 can be effectively avoided, thereby improving the overall energy utilization efficiency of the engine.

[0072] The embodiment of the present disclosure also provides an engine. The engine may include the structure of the glow plug 5 for the telescopic methanol engine as described above. The engine may execute the control method described above, thereby having high applicability and working range, and achieving the purpose of stable combustion under different working conditions.

[0073] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0074] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A structure of a glow plug for a telescopic methanol engine, It is characterized in that include: Drive unit; A plurality of cams are respectively mounted on the output shaft of the driving part to rotate synchronously with the output shaft; A plurality of rocker arms are respectively mounted on rocker arm shafts and are respectively slidably connected to the cams, the rocker arms rotate around the rocker arm shafts based on the rotation of the cams, the glow plug is mounted on a side of a first rocker arm away from the cam, and the first rocker arm represents a rocker arm corresponding to the cam with the smallest maximum diameter; Among them, the first rocker arm is connected to the other rocker arms through magnetism to drive the glow plug to enter or exit the combustion chamber of the methanol engine based on the rotation of the first cam, and the first cam represents the cam with the largest diameter among the cams corresponding to the rocker arm magnetically connected to the first rocker arm.

2. The structure of the glow plug for a telescopic methanol engine according to claim 1, It is characterized in that Each of the rocker arms is formed with a connecting hole, and the connecting holes of adjacent rocker arms are arranged relatively to each other. A magnetic part is installed in each connecting hole, and adjacent rocker arms are magnetically connected through the magnetic part so that the rocker arms after magnetic connection move synchronously.

3. The structure of the glow plug for a telescopic methanol engine according to claim 2, It is characterized in that The rocker arms at both ends are formed with one connecting hole, and the other rocker arms are formed with two connecting holes; Preferably, three cams are provided and three rocker arms are provided.

4. The structure of the glow plug for a telescopic methanol engine according to claim 1, It is characterized in that The plurality of cams have the same minimum diameter and different maximum diameters.

5. The structure of the glow plug for a telescopic methanol engine according to claim 1, It is characterized in that The glow plug extends in a direction perpendicular to the first rocker arm.

6. The structure of the glow plug for a telescopic methanol engine according to claim 1, It is characterized in that The plurality of cams extend in the same direction.

7. The structure of the glow plug for a telescopic methanol engine according to claim 1, It is characterized in that The plurality of cams are sequentially arranged in an axial direction of the output shaft based on the maximum diameter.

8. The structure of the glow plug for a telescopic methanol engine according to claim 1, It is characterized in that The glow plug is detachably mounted on the first rocker arm.

9. A method for controlling the structure of a glow plug for a telescopic methanol engine as claimed in any one of claims 1 to 8, It is characterized in that Three cams and three rocker arms are provided, the three cams include a first cam, a second cam and a third cam, the three rocker arms include a first rocker arm, a second rocker arm and a third rocker arm, the maximum diameter of the first cam is smaller than the maximum diameter of the second cam, the maximum diameter of the second cam is smaller than the maximum diameter of the third cam, and the control method includes: In the first working mode, the output shaft of the driving unit is controlled to rotate so that the first cam drives the first rocker arm to rotate, so as to drive the glow plug to enter or exit the combustion chamber of the methanol engine, and when the intake air temperature is greater than 0°C, the glow plug is controlled to stop heating; when the intake air temperature is less than 0°C, the glow plug is controlled to heat the temperature to 600°C during the piston compression stage; or In the second working mode, the output shaft of the driving unit is controlled to rotate, and when the rocker arm contacts the cam at the minimum diameter, the first rocker arm is controlled to be magnetically connected with the second rocker arm, so that the second cam drives the second rocker arm and the first rocker arm to rotate, so as to drive the glow plug to enter or exit the combustion chamber of the methanol engine, and when the intake air temperature is greater than 20°C, the glow plug is controlled to be heated to 700°C; when the intake air temperature is between 0°C and 20°C, the glow plug is controlled to be heated to 800°C; when the intake air temperature is less than 0°C, the glow plug is controlled to be heated to 900°C; or In the third working mode, the output shaft of the driving unit is controlled to rotate, and when the rocker arm contacts the cam at the minimum diameter, the first rocker arm is controlled to be magnetically connected to the second rocker arm, and the second rocker arm is controlled to be magnetically connected to the third rocker arm, so that the third cam drives the third rocker arm, the second rocker arm and the first rocker arm to rotate, so as to drive the glow plug to enter or exit the combustion chamber of the methanol engine; when the intake temperature is greater than 20°C, the glow plug is controlled to be heated to 800°C; when the intake temperature is between 0°C-20°C, the glow plug is controlled to be heated to 1000°C; when the intake temperature is less than 0°C, the glow plug is controlled to be heated to 1200°C.

10. An engine, include: The structure of the glow plug for a telescopic methanol engine as claimed in any one of claims 1 to 8.

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