Oil suction system with adaptive tilt state and oil suction system control method

Abstract

The present invention relates to an oil pan, and discloses an oil suction system with an adaptive tilt state and an oil suction system control method. The oil suction system with an adaptive tilt state comprises an oil pan, a plurality of oil suction pipes, a tilt detection device and a controller. The oil suction ports of the oil suction pipes are connected to the inner cavity of the oil pan and are arranged separately along the circumference of the oil pan. The controller controls the on-off of the oil suction pipes according to the tilt information of the oil pan fed back by the tilt detection device. The present invention can be applied to the tilt of any direction of the engine, ensure the normal operation of the engine oil lubrication system, and is applicable to various special-shaped oil pans.

Description

Technical Field

[0001] The present invention relates to an oil pan, and in particular to an oil suction system capable of self-adapting to an inclined state, and also to a method for controlling the oil suction system. Background Art

[0002] The oil pan is the lower half of the crankcase, also known as the lower crankcase. Its function is to seal the crankcase and serve as the outer shell of the oil storage tank to prevent impurities from entering. It also collects and stores the lubricating oil flowing back from the friction surfaces of the diesel engine, dissipates some heat, and prevents the lubricating oil from oxidizing. At the same time, when the crankshaft rotates, some of the lubricating oil that enters the oil pan will splash, which is beneficial to the lubrication of the components around the crankshaft.

[0003] When the engine is working, the oil pump sucks the lubricating oil in the oil pan through the oil suction pipe to lubricate and cool related parts. When the vehicle or machine equipment equipped with the engine enters the slope, the engine oil pan tilts accordingly, causing the lubricating oil to be unevenly distributed in the oil pan, and the lubricating oil flows to a low position. When the tilt angle is too large, there is a problem that the lubricating oil cannot immerse the oil suction port, resulting in uneven lubrication, which has a greater impact on the wear of engine parts over time.

[0004] At present, several conventional technical solutions are usually used to adapt to the slope working state of the engine. For example, for an oil suction system of an engine adaptive slope working state, the fixed oil suction pipe is limited by a retaining ring, the plug cover is sealed and connected to the movable oil suction pipe, and the suction port of the movable oil suction pipe automatically rotates to the lowest position under the action of gravity. However, this technical solution requires that the oil pan is relatively square and there is no obstruction inside it, which is not applicable to special-shaped oil pans. For another oil suction system scheme of an engine adaptive slope working state, in the oil pan, the oil sucked by the left and right oil suction pipes is merged to the upper oil suction pipe through the manifold. When the engine rolls over a certain angle, the gravity gate automatically blocks the oil suction pipe on the higher side under the action of gravity to prevent empty suction. It is often used in situations where the tilt angle in a certain direction changes greatly, such as when the left and right swing amplitude of a marine engine is large. However, it is only applicable to situations where the tilt angle in a certain direction changes greatly, and is not applicable to situations where the tilt angle changes greatly in all directions. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an oil suction system with an adaptive tilt state, which can be adapted to any tilt of the engine, ensure the normal operation of the engine oil lubrication system, and is applicable to various special-shaped oil pans.

[0006] A further technical problem to be solved by the present invention is to provide an oil suction system control method, which can be applied to the tilt of the engine in any direction to ensure the normal operation of the engine oil lubrication system.

[0007] In order to solve the above technical problems, on the one hand, the present invention provides an oil suction system with adaptive tilt state, including an oil pan, a plurality of oil suction pipes, a tilt detection device and a controller, the oil suction port of each oil suction pipe is connected to the inner cavity of the oil pan and is arranged circumferentially apart from each other along the oil pan, and the controller controls the on and off of each oil suction pipe according to the tilt information of the oil pan fed back by the tilt detection device.

[0008] Optionally, the oil suction port of the oil suction pipe is connected to the bottom of the oil pan.

[0009] Optionally, each of the oil suction pipes is provided with a reversing control valve connected to the controller.

[0010] Specifically, the oil outlets of the oil suction pipes are connected.

[0011] Specifically, the tilt detection device is installed on a side wall of the oil pan.

[0012] Optionally, the oil outlet of each of the oil suction pipes is connected to the main oil suction pipe.

[0013] Another aspect of the present invention provides an oil suction system control method, based on the oil suction system with adaptive tilt state according to any one of the above technical solutions, wherein the control method comprises the following steps:

[0014] Determining the inclined low-position area of ​​the oil pan according to the inclination information of the oil pan fed back by the inclination detection device;

[0015] The controller controls the oil suction pipe in the inclined low position area to be in an oil suction state.

[0016] Optionally, the tilt angle in the X direction and the tilt angle in the Y direction of the oil pan are set based on the position of the tilt detection device.

[0017] Furthermore, the oil pan is a rectangular oil tank, and each of the oil suction pipes includes a first oil suction pipe, a second oil suction pipe, a third oil suction pipe and a fourth oil suction pipe, and the first oil suction pipe, the second oil suction pipe, the third oil suction pipe and the fourth oil suction pipe are respectively connected to the four corner areas of the bottom of the oil pan in a one-to-one correspondence.

[0018] More specifically, when the X-direction inclination angle is ≥a and the Y-direction inclination angle is ≥b, the fourth oil suction pipe is opened and other oil suction pipes are cut off;

[0019] When the X-direction inclination angle ≥ a, -b<the Y-direction inclination angle<b, the fourth oil suction pipe or the first oil suction pipe is connected, and the other oil suction pipes are cut off;

[0020] When the X-direction inclination angle is ≥a and the Y-direction inclination angle is ≤-b, the first oil suction pipe is connected and other oil suction pipes are cut off;

[0021] When the X-direction inclination angle is ≤-a and the Y-direction inclination angle is ≥b, the third oil suction pipe is opened and other oil suction pipes are cut off;

[0022] When the X-direction inclination angle ≤ -a, -b<the Y-direction inclination angle<b, the third oil suction pipe or the second oil suction pipe is connected, and the other oil suction pipes are cut off;

[0023] When the X-direction inclination angle is ≤-a and the Y-direction inclination angle is ≤-b, the second oil suction pipe is connected and other oil suction pipes are cut off;

[0024] When -a<the X-direction tilt angle<a, and the Y-direction tilt angle≥b, the fourth oil suction pipe or the third oil suction pipe is connected, and other oil suction pipes are cut off;

[0025] When -a<the X-direction tilt angle<a, -b<the Y-direction tilt angle<b, the original state is maintained unchanged;

[0026] When -a<the X-direction tilt angle<a, and the Y-direction tilt angle<-b, the first oil suction pipe or the second oil suction pipe is connected, and the other oil suction pipes are cut off;

[0027] Wherein, a is the tilt switching angle in the X direction, and b is the tilt switching angle in the Y direction.

[0028] Through the above technical solution, the beneficial effects of the present invention are as follows:

[0029] Several oil suction pipes are arranged along the circumference of the oil pan, and a tilt detection device is used to detect the tilt condition of the oil pan, and the real-time tilt condition of the oil pan is fed back to the controller. The controller controls the opening and closing of the corresponding oil suction pipes according to the feedback tilt information, so that the oil suction pipes of one or some oil suction ports immersed in the lubricating oil are connected, and the other oil suction pipes of the oil suction ports not immersed in the lubricating oil are cut off, so that the lubricating oil can lubricate and cool the internal parts of the engine through the corresponding oil suction pipes, and at the same time, it can prevent the oil suction pipes from absorbing air instead of the lubricating oil, causing wear to the engine parts. Therefore, it can be applied to the situation where the tilt angle of any position of the engine changes greatly. Moreover, since several oil suction pipes are arranged along the circumference of the oil pan, the requirements for the shape and internal structure of the engine oil pan are low, and it is applicable to various special-shaped oil pans.

[0030] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 is a front view of an oil suction system in an adaptive tilt state in a specific embodiment of the present invention;

[0033] Figure 2 is a top view of an oil suction system in an adaptive tilt state in a specific embodiment of the present invention;

[0034] Figure 3 It is a three-dimensional schematic diagram of an oil suction system in an adaptive tilt state in a specific embodiment of the present invention.

[0035] Description of Reference Numerals

[0036] 1 Oil pan 2 First oil suction pipe

[0037] 3 Second oil suction pipe 4 Main oil suction pipe

[0038] 5Third oil suction pipe 6Fourth oil suction pipe

[0039] 7Tilt detection device 8Controller

[0040] 9 Directional control valve DETAILED DESCRIPTION

[0041] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0042] The terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the said features.

[0043] In the description of the present invention, it is necessary to understand that the orientation or positional relationship shown in the drawings is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] Reference Figures 1 to 3The present invention provides an oil suction system for an adaptive tilt state, comprising an oil pan 1, a plurality of oil suction pipes, a tilt detection device 7 and a controller 8, wherein the oil suction ports of the oil suction pipes are respectively connected to the inner cavity of the oil pan 1, and the oil suction ports of the oil suction pipes are arranged in a circumferentially spaced relationship along the oil pan 1, so as to cover all the tilted orientations of the engine and be applicable to the situation where the tilt angle of any orientation of the engine changes greatly, the tilt detection device 7 detects the tilt condition of the oil pan 1, and the controller 8 controls the on-off of each of the oil suction pipes according to the tilt information of the oil pan 1 fed back by the tilt detection device 7, so as to make the oil suction pipes of one or some of the oil suction ports immersed in the lubricating oil connected, and the other oil suction pipes not immersed in the lubricating oil are turned on. The oil suction pipe of the oil-immersed oil suction port is cut off, so that the lubricating oil can lubricate and cool the internal parts of the engine through the corresponding oil suction pipe, while preventing the oil suction pipe from failing to suck up the lubricating oil and sucking up air to cause wear to the engine parts; moreover, since a plurality of oil suction pipes are arranged along the circumference of the oil pan, the requirements for the shape and internal structure of the engine oil pan are low, and it is suitable for various special-shaped oil pans; compared with the existing method of using a movable oil suction pipe to automatically rotate to the lowest position under the action of gravity, there is a technical problem that the flexibility and reliability of the automatic rotation of the movable oil suction pipe are difficult to ensure, the oil suction port of the oil suction pipe of the present invention is arranged along the circumference of the oil pan, does not need to be rotated, and can ensure stable and reliable operation.

[0045] In the above technical solution, the oil suction port of each oil suction pipe is connected to the inner cavity of the oil pan 1, and the oil suction port of the oil suction pipe can be located at a position close to the bottom of the side wall of the oil pan 1, so that the lubricating oil can immerse the oil suction port of the oil suction pipe as much as possible. Figure 3 The oil suction port of the oil suction pipe can be connected to the bottom of the oil pan 1. This design can immerse the oil suction port of the oil suction pipe with lubricating oil to the greatest extent. To a certain extent, it can help to resist the impact on component lubrication or cooling caused by large changes in the engine's tilt angle.

[0046] Further, refer to Figure 1 A main oil suction pipe 4 can be set up so that the oil outlets of each oil suction pipe are connected to the main oil suction pipe 4, and the lubricating oil sucked by each oil suction pipe is converged into the main oil suction pipe 4. The main oil suction pipe 4 transports the lubricating oil to the engine for lubrication or cooling operations.

[0047] In order to control the on-off of each oil suction pipe, a reversing control valve 9 can be installed on each oil suction pipe. The reversing control valve 9 is used to control the on-off of each oil suction pipe, and the reversing control valve 9 is connected to the controller 8 by wired or wireless communication. According to the tilt information fed back by the tilt detection device 7, the controller 8 makes a judgment and sends a control instruction to the reversing control valve 9, thereby controlling the on-off of each oil suction pipe.

[0048] As a specific embodiment of the reversing control valve 9, the reversing control valve 9 may be an on-off valve, which is a valve that performs an opening or closing action according to an instruction, and specifically, may be a solenoid valve. In addition, the reversing control valve 9 may be a two-position four-way valve, and the two oil suction pipes are respectively connected to the two-position four-way valve, and through the reversal of the two-position four-way valve, one oil suction pipe is connected and the other oil suction pipe is cut off; or, the reversing control valve 9 may be a three-position four-way valve, and the two oil suction pipes are respectively connected to the three-position four-way valve, and through the reversal of the three-position four-way valve, one oil suction pipe is connected and the other oil suction pipe is cut off, or both oil suction pipes are cut off; or, the reversing control valve 9 may also be other valves that can achieve similar functions.

[0049] As a specific embodiment of the tilt detection device 7, the tilt detection device 7 can be an instrument for detecting the tilt angle, such as an inclinometer. The inclinometer is also called an angle meter or an electronic angle meter, which is often used to measure the horizontal angle change of the system. It can measure the inclination of the measured plane relative to the horizontal position, the parallelism and verticality of the two components.

[0050] In order to better understand the technical solution of the present invention, the preferred embodiments of the present invention are described below in combination with relatively comprehensive technical features.

[0051] Reference Figures 1 to 3 The oil suction system with adaptive tilt state in the preferred embodiment of the present invention comprises an oil pan 1, a plurality of oil suction pipes, a tilt detection device 7 and a controller 8. The oil suction port of each oil suction pipe is respectively connected to the bottom of the oil pan 1 and is communicated with the inner cavity of the oil pan 1. A reversing control valve 9 is installed on each oil suction pipe. The reversing control valve 9 may be an on-off valve. Each reversing control valve 9 is respectively communicated with the controller 8. The oil outlet of each oil suction pipe is connected to the main oil suction pipe 4. A tilt detection device 7 is installed on the side wall of the oil pan 1 for detecting the tilt condition of the oil pan 1. The tilt detection device 7 may be an inclinometer.

[0052] Using the above-mentioned oil suction system for adaptive tilt state, the present invention also provides an oil suction system control method for the engine adaptive tilt state, which specifically includes the following steps:

[0053] Determine the inclined low position area of ​​the oil pan 1 according to the inclination information of the oil pan 1 fed back by the inclination detection device 7;

[0054] The controller 8 controls the oil suction pipe in the inclined low position area to be in an oil suction state.

[0055] The tilt detection device 7 detects the tilt state of the oil pan 1, and can determine the position of the relatively low area of ​​the oil pan 1 after the tilt, and then feeds back to the controller 8, and the controller 8 controls the oil suction pipe in the tilted low area to be in the oil suction state, so as to provide lubricating oil to the engine and prevent the situation where the lubricating oil cannot be sucked. The low area refers to the relatively low position in the oil pan 1 when the vehicle tilts, and the high area is opposite to it.

[0056] Specifically, refer to Figure 2 In order to facilitate determination of the tilted low-position area, the X-direction tilt angle and the Y-direction tilt angle of the oil pan 1 can be set based on the position of the tilt detection device 7, so as to more accurately obtain the tilt state information of the oil pan 1.

[0057] Figure 3 A specific structural form of an oil suction system in an adaptive tilt state is shown, wherein the oil pan 1 is a rectangular oil tank, and taking four oil suction pipes, namely the first oil suction pipe 2, the second oil suction pipe 3, the third oil suction pipe 5 and the fourth oil suction pipe 6 as examples, the first oil suction pipe 2, the second oil suction pipe 3, the third oil suction pipe 5 and the fourth oil suction pipe 6 are respectively connected to an area in the four corners of the bottom of the oil pan 1 one by one, so that basically possible tilting directions when the oil pan 1 is tilted are covered.

[0058] As an embodiment, the specific control procedure of the control method may be specified as follows:

[0059] When the inclination angle in the X direction is ≥a and the inclination angle in the Y direction is ≥b, the fourth oil suction pipe 6 is opened and the other oil suction pipes are cut off, that is, the first oil suction pipe 2, the second oil suction pipe 3 and the third oil suction pipe 5 are in the cut-off state;

[0060] When the inclination angle in the X direction is ≥a and -b is less than the inclination angle in the Y direction <b, the fourth oil suction pipe 6 or the first oil suction pipe 2 is connected, and the other oil suction pipes are cut off, that is, the second oil suction pipe 3 and the third oil suction pipe 5 are in the cut-off state;

[0061] When the inclination angle in the X direction is ≥a and the inclination angle in the Y direction is ≤-b, the first oil suction pipe 2 is opened and the other oil suction pipes are cut off, that is, the second oil suction pipe 3, the third oil suction pipe 5 and the fourth oil suction pipe 6 are in the cut-off state;

[0062] When the inclination angle in the X direction is ≤-a and the inclination angle in the Y direction is ≥b, the third oil suction pipe 5 is opened and the other oil suction pipes are cut off, that is, the first oil suction pipe 2, the second oil suction pipe 3 and the fourth oil suction pipe 6 are in the cut-off state;

[0063] When the inclination angle in the X direction is ≤ -a, -b<the inclination angle in the Y direction<b, the third oil suction pipe 5 or the second oil suction pipe 3 is opened, and the other oil suction pipes are cut off, even if the first oil suction pipe 2 and the fourth oil suction pipe 6 are in the cut-off state;

[0064] When the inclination angle in the X direction is ≤-a and the inclination angle in the Y direction is ≤-b, the second oil suction pipe 3 is opened and the other oil suction pipes are cut off, that is, the first oil suction pipe 2, the third oil suction pipe 5 and the fourth oil suction pipe 6 are in the cut-off state;

[0065] When -a<X-direction tilt angle<a, Y-direction tilt angle≥b, the fourth oil suction pipe 6 or the third oil suction pipe 5 is connected, and other oil suction pipes are cut off, even if the first oil suction pipe 2 and the second oil suction pipe 3 are in the cut-off state;

[0066] When -a<X-direction tilt angle<a, -b<Y-direction tilt angle<b, the original state remains unchanged;

[0067] When -a<X-direction tilt angle<a, Y-direction tilt angle<-b, the first oil suction pipe 2 or the second oil suction pipe 3 is connected, and other oil suction pipes are cut off, that is, the third oil suction pipe 5 and the fourth oil suction pipe 6 are in the cut-off state;

[0068] Wherein, a is the tilt switching angle in the X direction, and b is the tilt switching angle in the Y direction.

[0069] Specifically, generally, the lubricating oil is relatively sufficient. Only when the vehicle is driving on a road with a large slope will the engine have a large tilt angle, so that the oil suction port of some oil suction pipes cannot absorb lubricating oil but absorbs air. The above-mentioned oil suction system control method of the present invention can well avoid the situation where the lubricating oil cannot be absorbed but the air is absorbed, and ensure the supply of lubricating oil to the engine. It can be applied to the situation where the tilt angle of any position of the engine changes greatly, has low requirements on the shape and internal structure of the engine oil pan, is applicable to various special-shaped oil pans, is stable and reliable, and is easy to repair.

[0070] Moreover, a reversing control valve 9 is installed on the oil suction pipe to control the on-off of each oil suction pipe. For the oil suction pipe in the cut-off state, even if there is some air in the oil suction pipe, when the tilting state is released, the reversing control valve 9 keeps the oil suction pipe in the cut-off state, so the air inside can continuously overflow into the upper space of the oil pan 1, thereby preventing the air in the oil suction pipe from being brought into the engine.

[0071] Further, a may be 10°-30°, preferably, a may be 20°-30°, and similarly, b may be 10°-30°, preferably, b may be 20°-30°.

[0072] In order to prevent the occurrence of a more extreme situation, that is, the amount of lubricating oil in the oil pan 1 is small, at this time, the engine has a small tilt angle, and the oil suction port of one or some oil suction pipes may not absorb the lubricating oil. At this time, a and b can be selected as 0°, and the specific control method can be as follows:

[0073] When the inclination angle in the X direction is ≥ 0 and the inclination angle in the Y direction is ≥ 0, the fourth oil suction pipe 6 is opened and the other oil suction pipes are cut off, that is, the first oil suction pipe 2, the second oil suction pipe 3 and the third oil suction pipe 5 are in the cut-off state;

[0074] When the inclination angle in the X direction is ≥0 and the inclination angle in the Y direction is ≤0, the first oil suction pipe 2 is opened and the other oil suction pipes are cut off, that is, the second oil suction pipe 3, the third oil suction pipe 5 and the fourth oil suction pipe 6 are in the cut-off state;

[0075] When the inclination angle in the X direction is less than 0 and the inclination angle in the Y direction is greater than or equal to 0, the third oil suction pipe 5 is opened and the other oil suction pipes are cut off, that is, the first oil suction pipe 2, the second oil suction pipe 3 and the fourth oil suction pipe 6 are in the cut-off state;

[0076] When the inclination angle in the X direction is less than 0 and the inclination angle in the Y direction is less than 0, the second oil suction pipe 3 is opened and the other oil suction pipes are cut off, that is, the first oil suction pipe 2, the third oil suction pipe 5 and the fourth oil suction pipe 6 are in a cut-off state.

[0077] The above extreme situations usually require repeated opening and closing of the reversing control valve 9, so that the reversing control valve 9 is controlled more frequently. Therefore, for non-extreme situations, a and b can be selected according to actual conditions, and a delayed confirmation design can be implemented.

[0078] In the above-mentioned technical solution of four-way oil suction pipes, for ease of understanding, several relatively simple tilting states are selected as examples, and the anti-tilting control is performed by controlling a single oil suction pipe to be turned on and the other oil suction pipes to be cut off. In actual driving, a vehicle may be in a low position on one side rather than a certain corner. At this time, it is entirely possible to control some oil suction pipes in the tilted low position area to be turned on and some oil suction pipes in the tilted high position area to be cut off. This control method also belongs to the technical concept of the present invention and belongs to the protection scope of the present invention.

[0079] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0080] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0081] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An oil suction system with self-adaptive tilt state, characterized in that: The oil pan (1) comprises an oil pan (1), a plurality of oil suction pipes, a tilt detection device (7) and a controller (8), wherein the oil suction port of each of the oil suction pipes is connected to the inner cavity of the oil pan (1) and is arranged in a spaced relationship along the circumference of the oil pan (1); the controller (8) delays confirmation of the tilted low position area of ​​the oil pan (1) based on the tilt information of the oil pan (1) fed back by the tilt detection device (7), so as to control each of the oil suction pipes in the tilted low position area to be in an oil suction state; and after the tilt state of the oil pan (1) is released, the controller (8) maintains the on-off state of each of the oil suction pipes; The oil suction port of the oil suction pipe is connected to the bottom of the oil pan (1).

2. The oil suction system according to claim 1, characterized in that: Each of the oil suction pipes is provided with a reversing control valve (9) connected to the controller (8).

3. The oil suction system according to claim 1, characterized in that: The oil outlets of the oil suction pipes are connected.

4. The oil suction system of any one of claims 1 to 3, characterized in that: The tilt detection device (7) is mounted on the side wall of the oil pan (1).

5. The oil suction system of any one of claims 1 to 3, characterized in that: The oil outlets of the oil suction pipes are all connected to the main oil suction pipe (4).

6. A method for controlling an oil suction system, based on the oil suction system with adaptive tilt state according to any one of claims 1 to 5, characterized in that: The control method comprises the following steps: Determining the inclined low-position area of ​​the oil pan (1) according to the inclination information of the oil pan (1) fed back by the inclination detection device (7); The controller (8) controls the oil suction pipe in the inclined low-position area to be in an oil suction state.

7. The oil suction system control method according to claim 6, characterized in that: The X-direction tilt angle and the Y-direction tilt angle of the oil pan (1) are set based on the position of the tilt detection device (7).

8. The oil suction system control method according to claim 7, characterized in that: The oil pan (1) is a rectangular oil tank, and each of the oil suction pipes comprises a first oil suction pipe (2), a second oil suction pipe (3), a third oil suction pipe (5) and a fourth oil suction pipe (6). The first oil suction pipe (2), the second oil suction pipe (3), the third oil suction pipe (5) and the fourth oil suction pipe (6) are respectively connected to the four corner areas of the bottom of the oil pan (1) in a one-to-one correspondence.

9. The oil suction system control method according to claim 8, characterized in that: When the X-direction inclination angle is ≥a and the Y-direction inclination angle is ≥b, the fourth oil suction pipe (6) is opened and the other oil suction pipes are cut off; When the X-direction inclination angle is ≥a and -b is < the Y-direction inclination angle <b, the fourth oil suction pipe (6) or the first oil suction pipe (2) is connected and the other oil suction pipes are cut off; When the inclination angle in the X direction is ≥a and the inclination angle in the Y direction is ≤-b, the first oil suction pipe (2) is connected and the other oil suction pipes are cut off; When the inclination angle in the X direction is ≤-a and the inclination angle in the Y direction is ≥b, the third oil suction pipe (5) is connected and the other oil suction pipes are cut off; When the X-direction inclination angle is ≤-a, -b<the Y-direction inclination angle<b, the third oil suction pipe (5) or the second oil suction pipe (3) is connected, and the other oil suction pipes are cut off; When the inclination angle in the X direction is ≤-a and the inclination angle in the Y direction is ≤-b, the second oil suction pipe (3) is connected and other oil suction pipes are cut off; When -a<the X-direction inclination angle<a and the Y-direction inclination angle≥b, the fourth oil suction pipe (6) or the third oil suction pipe (5) is connected and the other oil suction pipes are cut off; When -a<the X-direction tilt angle<a, -b<the Y-direction tilt angle<b, the original state is maintained unchanged; When -a<the X-direction tilt angle<a and the Y-direction tilt angle<-b, the first oil suction pipe (2) or the second oil suction pipe (3) is connected and the other oil suction pipes are cut off; Wherein, a is the tilt switching angle in the X direction, and b is the tilt switching angle in the Y direction.

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