Oil mist concentration control method, engine and vehicle

Abstract

The invention belongs to the technical field of engine control, and discloses an oil mist concentration control method, an engine and a vehicle. The oil mist concentration control method comprises the steps that S10, the actual oil mist concentration in a crankcase is obtained, and if the actual oil mist concentration is larger than an oil mist concentration set value N1, ventilation of the crankcase is controlled; s20, when the actual oil mist concentration is reduced to the oil mist concentration safety value N2, ventilation of the crankcase is stopped; s30, acquiring the time T2 required for increasing the actual oil mist concentration to the oil mist concentration set value N1 again; and S40, the relation between T2 and a time threshold T3 is judged, and if T2 is smaller than T3, a fault signal that the oil mist concentration is increased too fast is reported. According to the oil mist concentration control method, the oil mist concentration in the crankcase can be automatically adjusted, and the problems that the engine is damaged and personal injury is caused to personnel due to the fact that the oil mist concentration is too high are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and in particular to an oil mist concentration control method, an engine and a vehicle. Background Art

[0002] After the ship goes to sea, the engine needs to continuously output power and cannot be shut down, so the reliability requirements for the ship engine are high. Excessive crankcase oil mist concentration will cause the engine to slow down or even stop, especially in high-power equipment such as marine diesel engines. Excessive oil mist concentration in a high temperature environment may cause a diesel engine crankcase explosion accident, which will not only cause serious damage to the engine and cause economic losses, but also pose a threat to personal safety.

[0003] The ship engine cannot be shut down after going to sea, so it is necessary to automatically control when the oil mist concentration in the engine crankcase is too high to reduce the oil mist concentration, thereby protecting the engine from damage caused by excessive oil mist concentration and ensuring the personal safety of people on board.

[0004] Therefore, there is an urgent need for an oil mist concentration control method, an engine and a vehicle to solve the above problems. Summary of the invention

[0005] According to one aspect of the present invention, an object is to provide an oil mist concentration control method, which can automatically adjust the oil mist concentration in the crankcase to prevent the problem of excessive oil mist concentration causing engine damage and personal injury to personnel.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Oil mist concentration control methods include:

[0008] S10, obtaining the actual oil mist concentration in the crankcase, and if the actual oil mist concentration is greater than the oil mist concentration set value N1, controlling the crankcase ventilation;

[0009] S20, when the actual oil mist concentration drops to the oil mist concentration safety value N2, the crankcase ventilation is stopped;

[0010] S30, obtaining the time T2 required for the actual oil mist concentration to rise again to the oil mist concentration set value N1;

[0011] S40, judging the relationship between T2 and the time threshold T3, if T2<T3, reporting a fault signal of oil mist concentration increasing too fast.

[0012] As a preferred solution of the oil mist concentration control method provided by the present invention, in step S30, when the actual oil mist concentration rises to the oil mist concentration set value N1 again, it is also necessary to perform the following steps:

[0013] Controls crankcase ventilation.

[0014] As a preferred solution of the oil mist concentration control method provided by the present invention, in step S20, before stopping the crankcase ventilation, it is also necessary to perform the following steps:

[0015] S21, obtaining the time T1 for the actual oil mist concentration to decrease to the oil mist concentration safety value N2. If T1 is greater than the preset time, it is determined that the crankcase ventilation device is operating abnormally, and a ventilation device abnormality signal and a crankcase oil mist concentration excessively high signal are reported.

[0016] As a preferred solution of the oil mist concentration control method provided by the present invention, in step S21, when T1 is greater than the preset time, it is also necessary to perform:

[0017] Controls engine torque reduction.

[0018] As a preferred solution of the oil mist concentration control method provided by the present invention, in step S20, before stopping the crankcase ventilation, it is also necessary to perform the following steps:

[0019] S22. Within the set time T4, determine whether the actual oil mist concentration is reduced to the oil mist concentration safety value N2. If the actual oil mist concentration is not reduced to the oil mist concentration safety value N2, determine that the crankcase ventilation device is operating abnormally, and report a ventilation device abnormality signal and a crankcase oil mist concentration excessively high signal.

[0020] As a preferred embodiment of the oil mist concentration control method provided by the present invention, in step S22, when the actual oil mist concentration has not been reduced to the oil mist concentration safety value N2, it is also necessary to perform the following steps:

[0021] Controls engine torque reduction.

[0022] According to another aspect of the present invention, an object is to provide an engine, which controls the oil mist concentration in the crankcase based on the oil mist concentration control method as described in any of the above schemes, and the engine includes a crankcase, a ventilation device, an alarm device and a concentration sensor; the concentration sensor is arranged in the crankcase and can monitor the oil mist concentration in the crankcase; the ventilation device is arranged on the crankcase, and the space inside the crankcase is selectively connected to the external space through the ventilation device; the alarm device can report a fault signal of the oil mist concentration increasing too quickly.

[0023] As a preferred embodiment of the engine provided by the present invention, the engine also includes a control module, the ventilation device, the alarm device and the concentration sensor are respectively communicatively connected to the control module, the concentration sensor can transmit a concentration signal to the control module, and the control module can control the ventilation device and the alarm device according to the concentration signal.

[0024] As a preferred solution of the engine provided by the present invention, the control module is integrated into the ECU of a vehicle.

[0025] According to another aspect of the present invention, an object is to provide a vehicle, comprising an ECU and an engine as described in the above scheme, wherein the ECU is capable of controlling a ventilation device of the engine and the alarm device.

[0026] Beneficial effects of the present invention:

[0027] The oil mist concentration control method provided by the present invention can determine the timing of crankcase ventilation by detecting and obtaining the actual oil mist concentration in the crankcase, and timely reduce the oil mist concentration in the crankcase. The oil mist concentration control method can also determine the timing of crankcase ventilation stop by setting the oil mist concentration safety value N2, so as to achieve accurate control of the crankcase ventilation process. The oil mist concentration control method can also analyze and compare the time T2 required for the actual oil mist concentration within the set oil mist concentration safety value N2 to rise again to the oil mist concentration set value N1 and the time threshold T3, so as to know whether the oil mist concentration in the crankcase increases too fast, so as to timely remind the operator to overhaul the engine, avoid engine damage and personal injury to personnel, and improve reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0029] Figure 1 is a flow chart of the oil mist concentration control method provided in the first embodiment of the present invention;

[0030] Figure 2 It is a flow chart of the oil mist concentration control method provided in the second embodiment of the present invention. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In this embodiment, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] Embodiment 1

[0041] The present embodiment provides an oil mist concentration control method, an engine and a vehicle. The engine can control the oil mist concentration in the crankcase based on the oil mist concentration control method provided in the present embodiment. The engine includes a crankcase, a ventilation device, an alarm device and a concentration sensor. The concentration sensor is arranged in the crankcase and can monitor the oil mist concentration in the crankcase. The ventilation device is arranged on the crankcase, and the space inside the crankcase is selectively connected to the external space through the ventilation device. The ventilation device includes a ventilation pipe and a ventilation valve arranged in the ventilation pipe. When the ventilation valve is opened, the space inside the crankcase can be connected to the external space. At this time, the space inside the crankcase can be ventilated to reduce the oil mist concentration. The alarm device can alarm for abnormal concentration conditions in the crankcase and abnormal working conditions of the ventilation device.

[0042] Specifically, the above-mentioned transportation tool includes an ECU (Electronic Control Unit) and an engine provided in this embodiment. In this embodiment, the transportation tool is specifically a ship, and the engine is specifically a diesel engine.

[0043] More specifically, the engine further includes a control module. The ventilation device, the alarm device and the concentration sensor are respectively communicatively connected to the control module. The concentration sensor can transmit a concentration signal to the control module, and the control module can control the opening and closing of the ventilation device and the alarm information issued by the alarm device according to the concentration signal. In this embodiment, the control module is specifically integrated into the ECU of the above-mentioned vehicle, thereby improving the integration of the vehicle and simplifying its control system.

[0044] Figure 1 is a flow chart of the oil mist concentration control method provided in Example 1 of the present invention, referring to Figure 1This embodiment provides an oil mist concentration control method, which can automatically control the oil mist concentration in the crankcase to prevent the oil mist concentration from being too high, causing engine damage and personal injury to personnel.

[0045] The oil mist concentration control method specifically comprises the following steps:

[0046] Step S10, obtaining the actual oil mist concentration in the crankcase, if the actual oil mist concentration is greater than the oil mist concentration set value N1, then controlling the crankcase ventilation.

[0047] It should be noted that the above-mentioned oil mist concentration setting value N1 is an upper limit of the oil mist concentration set artificially according to the crankcase volume and the actual situation of the engine. If the actual oil mist concentration in the crankcase exceeds the oil mist concentration setting value N1, the engine is very likely to be damaged.

[0048] Step S20, ventilate the crankcase until the actual oil mist concentration drops to the oil mist concentration safety value N2, then stop the crankcase ventilation. It should be noted that the oil mist concentration safety value N2 is less than the oil mist concentration setting value N1. The oil mist concentration safety value N2 is the oil mist concentration that can ensure the normal and safe operation of the engine, and the oil mist concentration safety value N2 is less than the oil mist concentration setting value N1.

[0049] Specifically, in step S20, before stopping the crankcase ventilation, the following steps need to be performed: step S21, obtaining the time T1 for the actual oil mist concentration to decrease to the oil mist concentration safety value N2, if T1 is greater than the preset time, it is determined that the crankcase ventilation device is abnormal, and the ventilation device abnormality signal and the crankcase oil mist concentration excessively high signal are reported. At the same time, the crankcase ventilation is continuously performed.

[0050] It should be noted that the time T1 required for the actual oil mist concentration to decrease to the oil mist concentration safety value N2 can reflect the efficiency of ventilating the internal space of the crankcase through the ventilation device to reduce its oil mist concentration. If T1 is greater than the preset time, it means that the ventilation efficiency of the ventilation device is too low and cannot be applied to the oil mist concentration reduction process of this crankcase. At this time, it is highly likely that the ventilation device has failed. The above failure may be a blockage in the ventilation pipe or a failure in the ventilation valve, which cannot be opened to the required opening, etc. At this time, the alarm signal of the alarm device can remind the operator to check the ventilation device in time. The alarm signal of the alarm device can be a text prompt such as "abnormal ventilation device" and "excessive crankcase oil mist concentration" displayed on the display screen in the ship's cab. The above preset time can be selected in the design of the crankcase and the engine as a whole based on experience or the results of the oil mist concentration test. The specific method and steps are not repeated in this embodiment.

[0051] Specifically, in step S21, when T1 is greater than the preset time, it is also necessary to control the engine torque to decrease. When the crankcase oil mist concentration is too high and the existing ventilation device cannot reduce the oil mist concentration to the oil mist concentration safety value N2 within the preset time, the engine is in a high explosion risk state. At this time, the engine torque should be controlled to decrease or even shut down in time so as to perform maintenance.

[0052] Step S30, obtaining the time T2 required for the actual oil mist concentration to rise again to the oil mist concentration set value N1.

[0053] Specifically, in step S30, when the actual oil mist concentration rises to the oil mist concentration setting value N1 again, it is also necessary to control the crankcase ventilation. That is, as long as the actual oil mist concentration in the crankcase rises to the oil mist concentration setting value N1, the crankcase needs to be ventilated to avoid danger.

[0054] Step S40, determine the relationship between T2 and the time threshold T3, if T2 < T3, then report the fault signal of oil mist concentration increasing too fast. At this time, the operator needs to check and repair the engine.

[0055] Embodiment 2

[0056] This embodiment also provides a method for controlling oil mist concentration. Figure 2 The difference between this embodiment and the first embodiment is only in step S20.

[0057] In this embodiment, in step S20, before stopping the crankcase ventilation, the following steps need to be performed:

[0058] Step S22: within the set time T4, determine whether the actual oil mist concentration is reduced to the oil mist concentration safety value N2. If the actual oil mist concentration is not reduced to the oil mist concentration safety value N2, determine that the crankcase ventilation device is abnormal, and report the ventilation device abnormality signal and the crankcase oil mist concentration excessively high signal. At the same time, continue to ventilate the crankcase.

[0059] It should be noted that the set duration T4 can be selected in the design of the crankcase and the engine as a whole based on experience or the results of the oil mist concentration test. If the actual oil mist concentration is reduced to the oil mist concentration safety value N2 within the set duration T4, it means that the ventilation device has sufficient ability to ventilate the internal space of the crankcase to reduce its oil mist concentration. If the actual oil mist concentration cannot be reduced to the oil mist concentration safety value N2 within the set duration T4, it means that the ventilation device has insufficient ability to ventilate the internal space of the crankcase to reduce its oil mist concentration. At this time, there is a high probability that the ventilation device has a fault. The above fault may be a blockage in the ventilation pipe or a fault in the ventilation valve, which cannot be opened to the required opening, etc.

[0060] Specifically, in step S22, when the actual oil mist concentration has not been reduced to the oil mist concentration safety value N2, it is also necessary to control the engine torque to reduce. When the crankcase oil mist concentration is too high and the existing ventilation device cannot reduce the oil mist concentration to the oil mist concentration safety value N2 within the set time T4, the engine is in a high explosion risk state. At this time, the engine torque should be controlled to reduce or even shut down in time to perform maintenance.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The oil mist concentration control method is characterized by: include: S10, obtaining the actual oil mist concentration in the crankcase, and if the actual oil mist concentration is greater than the oil mist concentration set value N1, controlling the crankcase ventilation; S20, when the actual oil mist concentration drops to the oil mist concentration safety value N2, the crankcase ventilation is stopped; S30, obtaining the time T2 required for the actual oil mist concentration to rise again to the oil mist concentration set value N1; S40, judging the relationship between T2 and the time threshold T3, if T2<T3, reporting a fault signal of oil mist concentration increasing too fast.

2. The oil mist concentration control method according to claim 1, characterized in that: In step S30, when the actual oil mist concentration rises to the oil mist concentration setting value N1 again, it is also necessary to perform: Controls crankcase ventilation.

3. The oil mist concentration control method according to claim 1, characterized in that: In step S20, before stopping the crankcase ventilation, it is also necessary to perform the following steps: S21, obtaining the time T1 for the actual oil mist concentration to decrease to the oil mist concentration safety value N2. If T1 is greater than the preset time, it is determined that the crankcase ventilation device is operating abnormally, and a ventilation device abnormality signal and a crankcase oil mist concentration excessively high signal are reported.

4. The oil mist concentration control method according to claim 3, characterized in that: In step S21, when T1 is greater than the preset time, it is also necessary to perform: Controls engine torque reduction.

5. The oil mist concentration control method according to claim 1, characterized in that: In step S20, before stopping the crankcase ventilation, it is also necessary to perform the following steps: S22. Within the set time T4, determine whether the actual oil mist concentration is reduced to the oil mist concentration safety value N2. If the actual oil mist concentration is not reduced to the oil mist concentration safety value N2, determine that the crankcase ventilation device is operating abnormally, and report a ventilation device abnormality signal and a crankcase oil mist concentration excessively high signal.

6. The oil mist concentration control method according to claim 5, characterized in that: In step S22, when the actual oil mist concentration has not dropped to the oil mist concentration safety value N2, it is also necessary to perform the following steps: Controls engine torque reduction.

7. An engine, characterized in that The engine controls the oil mist concentration in the crankcase based on the oil mist concentration control method as described in any one of claims 1 to 6, and the engine includes a crankcase, a ventilation device, an alarm device and a concentration sensor; the concentration sensor is arranged in the crankcase and can monitor the oil mist concentration in the crankcase; the ventilation device is arranged on the crankcase, and the space inside the crankcase is selectively connected to the external space through the ventilation device; the alarm device can report a fault signal of the oil mist concentration increasing too quickly.

8. The engine according to claim 7, characterized in that The engine also includes a control module, and the ventilation device, the alarm device and the concentration sensor are respectively communicatively connected to the control module. The concentration sensor can transmit a concentration signal to the control module, and the control module can control the ventilation device and the alarm device according to the concentration signal.

9. The engine according to claim 8, characterized in that The control module is integrated into the ECU of a vehicle.

10. A means of transport, characterized in that The invention comprises an ECU and the engine as claimed in claim 9, wherein the ECU is capable of controlling the ventilation device and the alarm device of the engine.

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