Engine oil automatic sampling system and engineering machinery

Abstract

The utility model discloses an engine oil automatic sampling system and engineering machinery, including oil storage tank, first electromagnetic valve, second electromagnetic valve and hand valve, wherein, the oil storage tank is used for storing engine oil, including an oil inlet and two oil outlets, the inlet of first electromagnetic valve is connected with the main oil passage of engine, and its export is connected with the oil inlet of oil storage tank, the inlet of second electromagnetic valve is connected with one of the oil outlet of oil storage tank, and its export is connected with the branch oil passage of engine or the cylinder body oil passage communicated with the oil pan of engine, and the hand valve is connected with the other oil outlet of the oil storage tank and is used for discharging the engine oil stored in the oil storage tank. The oil sample of the system is the engine oil flowing through the main oil passage of engine during engine operation, can accurately reflect the real situation of the engine oil actually used, does not have the delay phenomenon, is favorable for the accuracy of oil sample analysis result. And need not to configure power component, can reduce the fluctuation influence to the whole machine oil pressure during engine oil sampling.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, specifically, it relates to an oil sampling device designed for engines in engineering machinery. Background Technology

[0002] Engine oil is the lubricant for engine operation, playing a vital role in lubrication, cleaning, cooling, sealing, and friction reduction. It is crucial for minimizing wear on engine parts and extending their lifespan. However, the health of engine oil is often overlooked by users, especially in construction machinery. Compared to laboratory environments, the actual operating environment of an engine is much harsher, with higher workloads, causing engine oil to deteriorate more rapidly. If the oil condition is not effectively monitored, deterioration can severely impact the lubrication and heat dissipation of rotating and high-temperature engine components, leading to component failure and serious engine malfunctions.

[0003] One major reason why users are reluctant to regularly sample and analyze engine oil is the inconvenience of traditional oil sampling methods. Typically, a drain valve is installed at the bottom of the oil pan, requiring the user to crawl into the engine compartment to open the drain valve and release some oil from the pan, while simultaneously inserting a pre-prepared container to the bottom of the pan to collect the remaining oil. Due to the extremely limited space in the engine compartment, crawling in and out is very difficult, and the oil in the oil pan does not accurately represent the actual amount of oil entering the engine during operation, resulting in a delay that affects the accuracy of the oil sample analysis results.

[0004] To address the aforementioned issues, Chinese invention patent application CN103808531A discloses an engine oil sampling device that does not reduce engine speed. This device adds a sampling oil path between the engine's return oil line and the oil tank, and incorporates a micro-pump within this path. The micro-pump extracts a portion of the engine oil discharged into the return oil line and pumps it to a sampling bottle to complete the oil sampling. While this sampling method solves the problems of inconvenient operation and poor accuracy in oil sample analysis, it requires an additional power unit, resulting in high costs and the need for regular maintenance. Furthermore, the micro-pump's extraction process causes fluctuations in oil pressure throughout the engine's oil circuit, affecting the accuracy of data analysis from existing monitoring points. Summary of the Invention

[0005] This utility model addresses at least one of the aforementioned technical problems in the prior art by proposing an automatic engine oil sampling system to improve the convenience of oil sampling and the accuracy of oil sample analysis results.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: In one aspect, this utility model proposes an automatic engine oil sampling system, comprising: An oil storage tank, used to store engine oil, includes one inlet and two outlets; The first solenoid valve has its inlet connected to the engine's main oil passage and its outlet connected to the oil inlet of the oil reservoir. The second solenoid valve has its inlet connected to one of the oil outlets of the oil reservoir, and its outlet connected to the branch oil passage of the engine or the cylinder oil passage connected to the oil pan of the engine. A hand valve, which is connected to another oil outlet of the oil storage tank, is used to discharge the engine oil stored in the oil storage tank.

[0007] In some embodiments of this application, to minimize alteration to the existing engine structure, the automatic engine oil sampling system can be installed on existing bores in the engine block. Specifically, for cases where measuring holes for installing a main oil passage oil pressure sensor are formed on the engine block, a first tee can be installed on the measuring hole. The first tee includes one inlet and two outlets. The inlet of the first tee is configured to connect to the measuring hole, thereby connecting to the engine's main oil passage. A main oil passage oil pressure sensor is installed on one outlet of the first tee to detect the oil pressure in the main oil passage. The other outlet of the first tee is configured to connect to the inlet of the first solenoid valve, so that a portion of the oil in the main oil passage is automatically diverted to the first solenoid valve under the oil pressure in the main oil passage.

[0008] In some embodiments of this application, the cylinder oil passage may be formed on the engine crankcase, allowing oil that does not need to be extracted for testing to flow back to the engine oil pan, thereby reducing oil consumption.

[0009] In some embodiments of this application, when a crankcase breather is installed on the engine crankcase, the crankcase breather can be used to separate the oil vapor and water vapor generated in the crankcase. The separated oil film flows through the rear oil pipe of the breather to the cylinder block oil passage, and then flows back to the engine oil pan through the cylinder block oil passage to achieve oil recovery. To reduce the amount of modification to the existing engine structure, a second three-way valve can be connected between the rear oil pipe of the breather and the cylinder block oil passage. The second three-way valve includes two inlets and one outlet. One inlet of the second three-way valve is connected to the rear oil pipe of the breather to receive the oil film separated by the crankcase breather; the other inlet of the second three-way valve is connected to the outlet of the second solenoid valve to receive the oil that does not need to be extracted and detected; the outlet of the second three-way valve is connected to the cylinder block oil passage to return the oil film separated by the crankcase breather and the oil that does not need to be extracted and detected to the engine oil pan for storage, thereby reducing oil consumption.

[0010] In some embodiments of this application, the hand valve may be a one-way valve to prevent impurities in the air from entering the oil storage tank and contaminating the engine oil in the oil storage tank.

[0011] In some embodiments of this application, the oil storage tank and the hand valve are preferably located outside the engine compartment to facilitate the user in extracting oil samples from the oil storage tank.

[0012] In some embodiments of this application, the control components of the first and second solenoid valves can be integrated into an operation panel that is easily accessible to the user, so as to facilitate the user's operation of the automatic engine oil sampling system.

[0013] In another aspect, this utility model also proposes an engineering machine, including an engine and an automatic engine oil sampling system; the automatic engine oil sampling system includes: An oil storage tank, used to store engine oil, includes one inlet and two outlets; The first solenoid valve has its inlet connected to the engine's main oil passage and its outlet connected to the oil inlet of the oil reservoir. The second solenoid valve has its inlet connected to one of the oil outlets of the oil reservoir, and its outlet connected to the branch oil passage of the engine or the cylinder oil passage connected to the oil pan of the engine. A hand valve, which is connected to another oil outlet of the oil storage tank, is used to discharge the engine oil stored in the oil storage tank.

[0014] In some embodiments of this application, for construction machinery equipped with a driver's cab, the control components of the first and second solenoid valves can be integrated into the control panel in the driver's cab to facilitate the driver's operation of the automatic engine oil sampling system.

[0015] In some embodiments of this application, the first and second solenoid valves can be DC solenoid valves, and the control component can be a switching element; a PLC controller can be installed in the engineering machinery, and the PLC controller is configured to control the first and second solenoid valves to open or close when powered on or off according to the switching state of the two switching elements, so as to control the oil sampling process.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are mainly reflected in: 1. This utility model is equipped with an automatic engine oil sampling system on the main oil passage of the engine. It can automatically extract engine oil by utilizing the existing oil pressure in the main oil passage. Since there is no need to configure an additional oil pump, it can reduce the impact of fluctuations in the overall engine oil pressure during oil sampling and can basically eliminate the interference caused to the detection results of various monitoring points on the engine.

[0017] 2. Since the oil sample extracted by this utility model is the engine oil that flows through the main oil passage of the engine during engine operation, it can accurately reflect the actual situation of the engine oil used in the engine, without any delay, which helps to improve the accuracy of the oil sample analysis results.

[0018] 3. The automatic engine oil sampling system of this utility model has a high degree of automation, and does not require users to enter the small engine compartment to perform sampling operations. Therefore, it can increase users' willingness to perform regular analysis and testing of engine oil, which in turn helps to ensure the health of the engine.

[0019] 4. This utility model selects to connect the engine oil automatic sampling system at the existing hole position on the engine block. The design is simple, does not require extensive modification to the existing engine structure, has a short upgrade cycle, high efficiency, low cost, and is easy to promote and apply in existing construction machinery.

[0020] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0022] Figure 1 This is a schematic diagram of the overall architecture of one embodiment of the automatic engine oil sampling system proposed in this utility model; Figure 2 This is a circuit block diagram of one embodiment of the circuit components of the first and second solenoid valves.

[0023] In the diagram, 10 is the first tee valve; 11 is the inlet; 12 is the outlet; 13 is the outlet; 20 is the first solenoid valve; 21 is the inlet; 22 is the outlet; 30 is the oil storage tank; 31 is the oil inlet; 32 is the oil outlet; 33 is the oil outlet; 40 is the second solenoid valve; 41 is the inlet; 42 is the outlet; 50 is the second tee valve; 51 is the inlet; 52 is the inlet; 53 is the outlet; and 60 is the manual valve. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or internal communication within components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0027] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] Oil passages are an important part of the engine lubrication system. Their main function is to transport engine oil from the oil pan to various parts of the engine that require lubrication, so as to ensure the normal operation of the engine. They are usually composed of main oil passages and branch oil passages. Their aperture design is smaller than that of the water passage system on the engine and they are completely isolated from the water passages of the cooling system.

[0029] The main oil passage of an engine is the core channel of the lubrication system. It is usually integrated into the engine block and cylinder head using a casting process and serves as the main channel for oil delivery, responsible for evenly distributing the oil to the branch oil passages. Branch oil passages are branches of the main oil passage, used to deliver oil to specific lubrication points in the engine, such as the crankshaft connecting rods, camshafts, and piston pins.

[0030] To enable engine oil to circulate within the oil passages, an oil pump is typically installed in the engine. The oil in the oil pan is pressurized by the oil pump and delivered to the main oil passage, from where it is distributed to various branch oil passages for precise, localized lubrication. After completing its lubrication task, the oil flows back to the oil pan for storage, thus achieving oil recycling.

[0031] Because the oil in the main oil passage has high oil pressure, a portion of the oil can be extracted using this pressure as an oil sample to test the health of the engine oil. Furthermore, since the oil in the main oil passage accurately reflects the actual condition of the oil used during engine operation, the accuracy of the oil sample analysis results can be guaranteed compared to existing technologies that collect oil samples from the bottom of the oil pan.

[0032] Based on the above design concept, this embodiment proposes an automatic engine oil sampling system, such as... Figure 1 As shown, it mainly includes key components such as the first three-way valve 10, the first solenoid valve 20, the oil storage tank 30, the second solenoid valve 40, and the second three-way valve 50.

[0033] The first three-way valve 10 is used to connect to the main oil passage of the engine and divert some of the oil in the main oil passage to the first solenoid valve 20 to extract the oil sample.

[0034] In this embodiment, in order to reduce the modification to the existing structure of the engine, the first tee 10 can be installed at the existing hole position on the engine block that connects to the main oil passage, so as to avoid additional drilling on the main oil passage of the engine and affecting the overall structure of the engine.

[0035] In some embodiments, the first tee 10 can be installed at the measuring point hole on the engine block where a main oil passage oil pressure sensor is mounted. The measuring point hole connects to the engine's main oil passage, and by installing the main oil passage oil pressure sensor thereon, changes in oil pressure within the main oil passage can be detected.

[0036] Specifically, the main oil passage oil pressure sensor is removed from the measuring point, and the inlet 11 of the first three-way valve 10 is connected to the measuring point. The main oil passage oil pressure sensor is then connected to one of the outlets 12 of the first three-way valve 10. This first three-way valve 10 establishes communication between the main oil passage oil pressure sensor and the engine's main oil passage, without affecting the sensor's accurate detection of oil pressure in the main oil passage. An oil supply pipe is connected to the other outlet 13 of the first three-way valve 10, and this pipe is connected to the inlet 21 of the first solenoid valve 20 to divert some of the oil from the main oil passage to the first solenoid valve 20.

[0037] The outlet 22 of the first solenoid valve 20 is connected to the inlet 31 of the oil storage tank 30 via an oil pipeline. When the first solenoid valve 20 is opened, a portion of the engine oil sampled from the main oil passage flows into the oil storage tank 30 through the first solenoid valve 20 to achieve oil sample storage.

[0038] In this embodiment, the oil storage tank 30 can be a small oil storage device with a small capacity, which can store a small amount of engine oil to meet the testing requirements.

[0039] Using a small oil storage tank 30 to store oil samples can prevent excessive oil extraction and waste, and avoid excessive consumption of engine oil, which would affect the engine's lubrication performance. In addition, by limiting the amount of oil extracted using the capacity of the oil storage tank 30, it is not necessary to configure an additional liquid level monitoring sensor to detect the liquid level in the oil storage tank 30 as required by existing technology (Chinese invention patent application with publication number CN103808531A). The structure is simple and low-cost, and there is no need to design corresponding control programs for the size of the oil sample extraction, making it easier to implement and popularize.

[0040] In this embodiment, two oil outlets 32 and 33 can be opened at the bottom of the oil storage tank 30. One of the oil outlets 32 is connected to the inlet 41 of the second solenoid valve 40 through an oil supply pipe. A hand valve 60 is installed on the other oil outlet 32. Opening the hand valve 60 can discharge the engine oil stored in the oil storage tank 30.

[0041] In this embodiment, the hand valve 60 is preferably a one-way valve to prevent impurities in the outside air from entering the oil reservoir 30 through the hand valve 60 during the opening of the hand valve 60, contaminating the engine oil and affecting the accuracy of the engine oil analysis and test results.

[0042] The outlet 42 of the second solenoid valve 40 is connected to the second three-way valve 50 via an oil supply pipe. The second three-way valve 50 is connected to the branch oil passage of the engine or the cylinder oil passage connected to the oil pan of the engine to realize the return of engine oil.

[0043] The engine block has many branch oil passages that channel the oil from the main oil passage to different lubrication points, providing lubrication for various engine components. Oil flowing through the automatic engine oil sampling system can be returned to the branch oil passages if it does not need to be sampled, thus achieving oil recycling.

[0044] However, considering that the engine oil flowing into the branch oil passage may have already undergone pre-treatment through components such as the strainer and filter, directly returning the recovered engine oil to the branch oil passage may affect the original engine oil in the branch oil passage. Therefore, in this embodiment, the second three-way valve 50 is preferably connected to the cylinder block oil passage that communicates with the engine's oil pan, so as to introduce the recovered engine oil into the oil pan for storage.

[0045] Specifically, in order not to alter the existing structure of the engine block, this embodiment preferably connects the second tee 50 between the rear oil pipe of the crankcase breather and the oil passage of the cylinder block.

[0046] Existing engine crankcases typically have a crankcase breather installed to separate high-temperature oil vapor from water vapor generated within the crankcase. The separated oil film, after condensation, flows through the breather's rear oil pipe to the cylinder block oil passage, and then back to the engine's oil pan, thus achieving oil recovery. To avoid extensive modifications to the existing engine structure, this embodiment disconnects the breather's rear oil pipe from the cylinder block oil passage, installing a second three-way connector 50 in between. This allows oil that does not need to be removed for testing to flow back to the oil pan without affecting oil film recovery, thereby reducing oil consumption.

[0047] Specifically, the three ports of the second three-way valve 50 can be configured as two inlets 51 and 52 and one outlet 53. One inlet 52 of the second three-way valve 50 is connected to the rear oil pipe of the breather to receive the oil film separated by the crankcase breather. The other inlet 51 of the second three-way valve 50 is connected to the outlet 42 of the second solenoid valve 40 via an oil supply pipe to receive engine oil that does not need to be removed for testing. The outlet 53 of the second three-way valve 50 is connected to the cylinder block oil passage to recover the oil film separated by the crankcase breather and the engine oil that does not need to be removed for testing back to the engine oil pan through the cylinder block oil passage, thereby achieving oil recycling.

[0048] To facilitate user operation, the first three-way valve 10, the second three-way valve 50, the first solenoid valve 20, and the second solenoid valve 40 can be installed inside the engine compartment, while the oil reservoir 30 and the hand valve 60 can be installed outside the engine compartment. This way, the user does not need to crawl into the narrow engine compartment and can open the hand valve 60 in the spacious space outside the engine compartment to collect the oil sample.

[0049] The control components of the first solenoid valve 20 and the second solenoid valve 40 can be integrated into an operation panel that is easily accessible to the user. For example, for construction machinery with a driver's cab, the control components of the first solenoid valve 20 and the second solenoid valve 40 can be integrated into the operation panel in the driver's cab to facilitate the driver's operation of the automatic engine oil sampling system.

[0050] In some embodiments, the first solenoid valve 20 and the second solenoid valve 40 can be DC solenoid valves, which open when powered on and close when powered off. The control components of the first solenoid valve 20 and the second solenoid valve 40 can be buttons, knobs, toggle switches, or other switching elements arranged on the control panel for easy operation by the user / driver.

[0051] In order to realize the control of the solenoid valves by the control components, this embodiment uses an existing processor in engineering machinery, such as a PLC controller, to detect the switching status of the two control components, and controls the first solenoid valve 20 and the second solenoid valve 40 to be energized or de-energized according to the switching status of the two control components.

[0052] Specifically, such as Figure 2 As shown, the control component K1 corresponding to the first solenoid valve 20 can be connected in series between the low-voltage DC power supply VCC on the control panel and one of the input terminals IN1 of the PLC controller, and the control component K2 corresponding to the second solenoid valve 40 can be connected in series between the low-voltage DC power supply VCC and another input terminal IN2 of the PLC controller. Figure 2 In this diagram, YV1 represents the first solenoid valve 20, and YV2 represents the second solenoid valve 40. The positive terminal of the first solenoid valve YV1 is connected in series with the normally open contact of the first relay KV1, and then connected to a DC power supply VDD. The DC power supply VDD provides the DC voltage required for the solenoid valves to operate. The negative terminal of the first solenoid valve YV1 is grounded to GND, and shares a common ground with the PLC controller. The positive terminal of the second solenoid valve YV2 is connected in series with the normally open contact of the second relay KV2, and then connected to the DC power supply VDD. The negative terminal of the second solenoid valve YV2 is grounded to GND. The two output terminals OUT1 and OUT2 of the PLC controller are connected to the coils of the first relay KV1 and the second relay KV2, respectively, to control the on / off state of the coils of the first relay KV1 and the second relay KV2.

[0053] Its working principle is as follows: When the control component K1 is disconnected, the PLC controller detects that its input terminal IN1 is at a low potential. At this time, the PLC controller pulls down the potential of its output terminal OUT1, causing the coil of the first relay KV1 to be de-energized. The normally open contact of the first relay KV1 remains open, cutting off the power supply circuit of the first solenoid valve YV1 and controlling the valve core in the first solenoid valve YV1 to close.

[0054] Conversely, when the control component K1 is closed, the low-voltage DC power supply VCC is applied to the input terminal IN1 of the PLC controller through the closed control component K1, pulling the potential of the input terminal IN1 high. When the PLC controller detects that its input terminal IN1 has become high, it outputs a high level through its output terminal OUT1, controlling the coil of the first relay KV1 to be energized, closing the normally open contact of the first relay KV1, thereby connecting the power supply circuit of the first solenoid valve YV1 and controlling the valve core in the first solenoid valve YV1 to open.

[0055] Similarly, during the period when the control component K2 is disconnected, the PLC controller detects that its input terminal IN2 is at a low potential. At this time, the PLC controller pulls down the potential of its output terminal OUT2, causing the coil of the second relay KV2 to be de-energized. The normally open contact of the second relay KV2 remains open, cutting off the power supply circuit of the second solenoid valve YV2 and controlling the valve core in the second solenoid valve YV2 to close.

[0056] Conversely, when the control component K2 is closed, the low-voltage DC power supply VCC is applied to the input terminal IN2 of the PLC controller through the closed control component K2, pulling the potential of the input terminal IN2 high. When the PLC controller detects that its input terminal IN2 has become high, it outputs a high level through its output terminal OUT2, controlling the coil of the second relay KV2 to be energized, closing the normally open contact of the second relay KV2, thereby connecting the power supply circuit of the second solenoid valve YV2 and controlling the valve core in the second solenoid valve YV2 to open.

[0057] Industrial applicability

[0058] After equipping the engine oil automatic sampling system of this embodiment with the engine in the construction machinery, when it is necessary to test the health status of the engine oil, the engine is first started and the oil is allowed to circulate for a period of time to ensure that the sampled oil is the oil that the engine is currently using.

[0059] Then, the control components K1 and K2 are closed to open the valve cores of the first solenoid valve 20 and the second solenoid valve 40, allowing the engine oil in the main oil passage to flow into the oil reservoir 30 through the first three-way valve 10 and the first solenoid valve 20, flow through the oil reservoir 30 to the second solenoid valve 40, and return to the engine block oil passage through the second solenoid valve 40 and the second three-way valve 50, and be recovered to the oil pan through the cylinder block oil passage.

[0060] After the engine oil has circulated for 1 minute, disconnect control component K2 and close the second solenoid valve 40, allowing the engine oil to be stored in the oil reservoir 30. Then, disconnect control component K1 and close the first solenoid valve 20.

[0061] During the above period, manual valve 60 remains closed.

[0062] Prepare an oil sample bottle and place it at the outlet of the hand valve 60. Open the hand valve 60 to transfer the engine oil stored in the oil tank 30 to the oil sample bottle.

[0063] By using a testing device to test the engine oil in the oil sample bottle, the health condition of the engine oil can be determined.

[0064] Of course, the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. An automatic engine oil sampling system, characterized in that, include: An oil storage tank, used to store engine oil, includes one inlet and two outlets; The first solenoid valve has its inlet connected to the engine's main oil passage and its outlet connected to the oil inlet of the oil reservoir. The second solenoid valve has its inlet connected to one of the oil outlets of the oil reservoir, and its outlet connected to the branch oil passage of the engine or the cylinder oil passage connected to the oil pan of the engine. A hand valve, which is connected to another oil outlet of the oil storage tank, is used to discharge the engine oil stored in the oil storage tank.

2. The automatic engine oil sampling system according to claim 1, characterized in that, The cylinder block of the engine has a measuring point hole for installing a main oil passage oil pressure sensor, and the measuring point hole is connected to the main oil passage. A first tee is installed on the measuring point hole. The first tee includes an inlet and two outlets. The inlet of the first tee is connected to the measuring point hole. A main oil passage oil pressure sensor is installed on one of the outlets of the first tee, and the other outlet is connected to the inlet of the first solenoid valve.

3. The automatic engine oil sampling system according to claim 1 or 2, characterized in that, The cylinder block oil passage is formed on the engine crankcase.

4. The automatic engine oil sampling system according to claim 3, characterized in that, A crankcase breather is installed on the engine crankcase. The crankcase breather is used to separate the oil and water vapor generated in the crankcase. The separated oil film flows into the cylinder block oil passage through the rear oil pipe of the breather. A second three-way valve is connected between the rear oil pipe of the breather and the cylinder oil passage. The second three-way valve includes two inlets and one outlet. One inlet of the second three-way valve is connected to the rear oil pipe of the breather to receive the oil film separated by the crankcase breather. The other inlet of the second three-way valve is connected to the outlet of the second solenoid valve. The outlet of the second three-way valve is connected to the cylinder oil passage.

5. The automatic engine oil sampling system according to claim 1, characterized in that, The manual valve is a one-way valve.

6. The automatic engine oil sampling system according to claim 5, characterized in that, The oil storage tank and manual valve are located outside the engine compartment.

7. The automatic engine oil sampling system according to claim 1, characterized in that, The control components of the first and second solenoid valves are integrated into an easily accessible control panel.

8. An engineering machinery, characterized in that, Includes an engine and an automatic engine oil sampling system as described in any one of claims 1 to 7.

9. The engineering machinery according to claim 8, characterized in that, The construction machinery includes a driver's cab, and the control components for the first and second solenoid valves are integrated on the control panel in the driver's cab.

10. The engineering machinery according to claim 9, characterized in that, The first and second solenoid valves are DC solenoid valves, and the control component is a switching element; The engineering machinery is equipped with a PLC controller, which controls the first and second solenoid valves to open or close when powered on or off according to the switching status of two switching elements.

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