CN112282895B - Oil-gas separator, control method, electronic control unit and oil-gas separation system - Google Patents

Oil-gas separator, control method, electronic control unit and oil-gas separation system Download PDF

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CN112282895B
CN112282895B CN202011298400.7A CN202011298400A CN112282895B CN 112282895 B CN112282895 B CN 112282895B CN 202011298400 A CN202011298400 A CN 202011298400A CN 112282895 B CN112282895 B CN 112282895B
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oil
gas
engine
air
gas separator
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CN112282895A (en
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马乐
刘纪光
张玉娟
王笃志
韩正金
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00Crankcase ventilating or breathing
    • F01M13/04Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00Pumping installations or systems specially adapted for elastic fluids
    • F04B41/02Pumping installations or systems specially adapted for elastic fluids having reservoirs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00Crankcase ventilating or breathing
    • F01M13/04Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M2013/0422Separating oil and gas with a centrifuge device

Abstract

The invention provides an oil-gas separator, a control method, an electronic control unit and an oil-gas separation system. The system comprises an engine, a drying device, a gas storage device and a valve; the engine includes: the device comprises an electronic control unit, an oil-gas separator, an air compression device and a crankcase; the air outlet of the air compression device is connected with the air inlet of the drying device, the air outlet of the drying device is connected with the air inlet of the air storage device, and the air outlet of the air storage device is connected with the second air inlet of the oil-gas separator through an air guide pipe; the valve is arranged on the air guide pipe, and the output end of the electronic control unit is connected with the control end of the valve; and the electronic control unit is used for controlling the opening of the valve according to the running working condition of the engine so as to adjust the separation strength of the oil-gas separator. By the system, abrasion caused by insufficient lubrication of parts of the engine requiring engine oil lubrication can be avoided, and the separation strength of the oil-gas separator can be adjusted.

Description

Oil-gas separator, control method, electronic control unit and oil-gas separation system
Technical Field
The invention relates to the technical field of crankcase ventilation systems, in particular to an oil-gas separator, a control method, an electronic control unit and an oil-gas separation system.
Background
The engine can produce burning waste gas when burning fuel to, can have unburned combustible mixture in the cylinder of engine, above-mentioned two kinds of gas probably enter into the crankcase of engine, make the temperature rise in the crankcase, and then increased the evaporation capacity of crankcase oil pan machine oil, formed more machine oil steam. Secondly, the lubrication of the sub-components inside the crankcase is performed by splash lubrication, which may generate oil mist. When the oil mist and the oil vapor in the crankcase are mixed with the above two gases (i.e., the combustion exhaust gas and the unburned combustible mixture), an aerosol (i.e., an oil-gas mixture) is formed, and if the oil-gas mixture is directly discharged into the air, serious environmental pollution may be caused, and the oil may be wasted.
At present, engine oil and gas in an oil-gas mixture discharged from an air outlet of a crankcase are separated mainly by arranging an oil-gas separator driven by the engine oil on an engine. Specifically, the oil-gas separator driven by the engine oil is connected with an engine oil duct of the engine so that the engine oil duct conveys the engine oil to the oil-gas separator, and the oil-gas separator is driven to separate oil from gas in an oil-gas mixture.
However, the oil for driving the oil-gas separator is taken from the engine, which easily causes that the parts of the engine which need the lubrication of the oil are not sufficiently lubricated due to the insufficient oil, so that the parts are abraded.
Disclosure of Invention
The invention provides an oil-gas separator, a control method, an electronic control unit and an oil-gas separation system, which aim to solve the problem that parts of an engine which need engine oil lubrication cannot be sufficiently lubricated due to insufficient engine oil.
In a first aspect, the present invention provides an oil and gas separator comprising: the device comprises a shell, a driving piece, a separating piece and a rotating supporting piece;
a separation cavity and a driving cavity are arranged in the shell, the separation cavity is positioned at the upper part of the driving cavity, the separation piece is positioned in the separation cavity, the driving piece is positioned in the driving cavity, the rotating supporting piece penetrates through the separation cavity and the driving cavity, and the driving piece and the separation piece are both fixed on the rotating supporting piece;
the shell is provided with a first air inlet, a second air inlet, a first air outlet, a second air outlet and an oil return pipeline; the first air inlet and the first air outlet are both communicated with the separation cavity, the second air inlet and the second air outlet are both communicated with the driving cavity, the first air inlet is connected with an air outlet of a crankcase of an engine, and the second air inlet is connected with an air storage device storing air;
the rotating support piece is of a hollow structure, a through hole is formed in the side wall of the rotating support piece, which is close to the bottom of the separation cavity, the bottom of the rotating support piece is connected with one end of the oil return pipeline, and the other end of the oil return pipeline penetrates through the bottom of the driving cavity and is connected with an oil pan of the crankcase of the engine;
when the gas storage device conveys gas to the driving cavity through the second gas inlet, the gas drives the driving piece to rotate so as to drive the separating piece to carry out oil-gas separation on the oil-gas mixture discharged into the separating cavity from the crankcase, so that the separated gas is discharged through the first gas outlet, and the separated engine oil is discharged into an oil pan of the engine crankcase through the oil return pipeline.
In a second aspect, the present invention provides an oil and gas separation system, the system comprising: the device comprises an engine, a drying device, a gas storage device and a valve; the engine includes: an electronic control unit, the gas-oil separator, the air compression device, and the crankcase as described in the first aspect;
the air outlet of the air compression device is connected with the air inlet of the drying device, the air outlet of the drying device is connected with the air inlet of the air storage device, the air outlet of the air storage device is connected with the second air inlet of the oil-gas separator through an air duct, the air outlet of the crankcase is connected with the first air inlet of the oil-gas separator, and the oil return pipeline of the oil-gas separator is connected with the oil pan of the crankcase of the engine;
the valve is arranged on the air guide pipe, and the output end of the electronic control unit is connected with the control end of the valve;
the drying device is used for drying the compressed air output by the air compression device and conveying the compressed air to the air storage device;
and the electronic control unit is used for controlling the opening of the valve according to the running working condition of the engine so as to adjust the separation strength of the oil-gas separator.
Optionally, the electronic control unit is specifically configured to:
acquiring the pressure of gas conveyed to the oil-gas separator by the gas storage device according to the operating condition of the engine and the mapping relation between the preset operating condition and the gas pressure;
and controlling the opening of the valve according to the pressure of the gas transmitted to the oil-gas separator by the gas storage device.
Optionally, the valve comprises a pressure relief valve;
the electronic control unit is specifically used for controlling the opening of the pressure reducing valve so as to adjust the separation strength of the oil-gas separator.
Optionally, the valve further comprises: an air filter;
the air filter is used for filtering liquid impurities in the gas transmitted to the oil-gas separator by the gas storage device.
Optionally, the valve further comprises: an oil atomizer;
the oil atomizer is used for lubricating the valve.
In a third aspect, the invention provides a vehicle comprising an oil and gas separation system as defined in any one of the second aspects.
In a fourth aspect, the invention provides a control method of an oil-gas separator, the method is used for controlling the oil-gas separator in the first aspect, and the valve is positioned on a gas guide pipe connecting an air outlet of the gas storage device and a second air inlet of the oil-gas separator; the method comprises the following steps:
acquiring the operating condition of an engine;
and controlling the opening of the valve according to the running working condition of the engine so as to adjust the separation strength of the oil-gas separator.
Optionally, the controlling the opening of the valve according to the operation condition of the engine to adjust the separation strength of the oil-gas separator includes:
acquiring the pressure of gas conveyed to the oil-gas separator by a gas storage device according to the operating condition of the engine and the mapping relation between the preset operating condition and the gas pressure;
and controlling the opening of the valve according to the pressure of the gas transmitted to the oil-gas separator by the gas storage device.
In a fifth aspect, the present invention provides an electronic control unit comprising: at least one processor, a memory;
the memory stores computer-executable instructions;
the at least one processor executes computer-executable instructions stored by the memory to cause the electronic control unit to perform the method of the fourth aspect.
According to the oil-gas separator, the control method, the electronic control unit and the oil-gas separation system, gas is used as a driving medium of the oil-gas separator, and engine oil is not used as the driving medium, so that abrasion caused by insufficient lubrication of parts needing engine oil lubrication is avoided. In addition, the engine oil returned to the oil pan of the crankcase of the engine by the oil-gas separator is only the engine oil separated from the oil-gas mixture and is independently returned, so that the risks of unsmooth oil return of the oil-gas separator and engine oil spraying are reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings needed to be used in the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
FIG. 1 is a schematic structural diagram of an oil-gas separator provided by the invention;
FIG. 2 is a schematic structural diagram of an oil-gas separation system provided by the present invention;
FIG. 3 is a schematic flow chart of a control method of an oil-gas separator provided by the invention;
FIG. 4 is a schematic structural diagram of a control device of an oil-gas separator provided by the invention;
fig. 5 is a schematic structural diagram of an electronic control unit according to the present invention.
Description of reference numerals:
1: a housing; 2: a drive member;
3: a separating member; 4: rotating the support member;
5: a separation chamber; 6: a drive chamber;
7: a first air inlet; 8: a second air inlet;
9: a first air outlet; 10: a second air outlet;
11: a through hole; 12: an oil return line.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The oil-gas separator is one of the components of crankcase ventilation system of engine, and has wide application in the fields of automobile, ship, airplane, etc. Specifically, the oil-gas separator is used for separating oil-gas mixture discharged from an air outlet of a crankcase of an engine. The oil-gas mixture includes combustion exhaust gas generated when the engine burns fuel (such as diesel oil or gasoline), unburned combustible mixture, oil vapor generated by a crankcase, and oil mist. The oil-gas separator can separate the engine oil from the oil-gas mixture, then the separated engine oil returns to an oil pan of an engine crankcase, and the separated gas is discharged through an air outlet of the oil-gas separator.
The existing oil-gas separator mainly comprises a separation cavity, a separation blade, a rotating shaft, a driving oil cavity, an impeller and the like. The separation blade in the separation cavity and the impeller in the driving oil cavity are fixed on the same rotating shaft. The existing oil-gas separator realizes the following modes of separating oil-gas mixture: an oil inlet of the driving oil cavity is connected with an oil pan of the engine crankcase through one engine oil duct, and an oil outlet of the driving oil cavity is connected with the oil pan of the engine crankcase through the other engine oil duct to form an engine oil loop. The oil sump of the crankcase is used for conveying the oil, and the oil in the oil sump is used for driving the oil-gas separator to drive the impeller in the oil cavity to rotate. The impeller rotates to drive the separation blades which are fixed on the same rotating shaft and are positioned in the separation cavity to rotate, and then the oil-gas mixture can be separated from the gas under the action of centrifugal force. After the engine oil is separated from the oil-gas mixture, the engine oil returns to a driving oil cavity of the oil-gas separator under the action of gravity. And the engine oil separated by the oil-gas separator is mixed with the engine oil in the driving oil cavity and then returns to an oil pan of the crankcase.
As described above, the driving medium of the conventional gas-oil separator is oil, and the oil is derived from the engine lubricating oil passage, and the oil itself is used for lubricating parts requiring lubrication in the engine. Therefore, if the branched lubricating oil is used to drive the oil-gas separator, the amount of oil used for parts of the engine that need to be lubricated by the oil may be insufficient, and further, the parts of the engine that need to be lubricated by the oil may not be sufficiently lubricated due to insufficient oil, and further, the parts may be worn. Then, the oil separated from the oil-gas mixture is returned from the drive oil chamber to the oil pan connected to the crankcase together with the return oil of the drive oil. However, if the engine is in an inclined state, the driving oil cavity is also in an inclined state, and oil return may not pass through the driving oil cavity, so that the oil-gas separator may not return oil smoothly and the risk of oil spraying may be caused.
The reason for considering the above problems of the prior art is influenced by the driving medium of the oil separator. The invention provides an oil-gas separator, which is a gas-driven oil-gas separator, and engine oil is not needed to be used as a driving medium of the oil-gas separator, so that abrasion of parts of an engine needing engine oil lubrication due to insufficient lubrication is avoided. In addition, the engine oil returned to the oil pan of the crankcase of the engine by the oil-gas separator is only the engine oil separated from the oil-gas mixture and is independently returned, so that the risks of unsmooth oil return of the oil-gas separator and engine oil spraying are reduced.
Fig. 1 is a schematic structural diagram of an oil-gas separator provided by the present invention, and as shown in fig. 1, the oil-gas separator includes: a housing 1, a driving member 2, a separating member 3, and a rotary support member 4.
The oil-gas separator is characterized in that a separation cavity 5 and a driving cavity 6 are arranged in a shell 1 of the oil-gas separator, and the separation cavity 5 is positioned at the upper part of the driving cavity 6. Alternatively, the separation chamber 5 and the driving chamber 6 may be two adjacent chambers, i.e. the bottom of the separation chamber 5 is adjacent to the top of the driving chamber 6. Alternatively, there may be other components or cavities between the separation chamber 5 and the drive chamber 6.
The separating part 3 is positioned in the separating cavity 5, the driving part 2 is positioned in the driving cavity 6, the rotating supporting part 4 penetrates through the separating cavity 5 and the driving cavity 6, and the driving part 2 and the separating part 3 are both fixed on the rotating supporting part 4. The rotating support piece 4 of the oil-gas separator is of a hollow structure.
Alternatively, the separating element 3 may be any element for separating the oil-gas mixture by centrifugal force, for example, the separating element 3 may be composed of at least one separating blade. The drive member 2 may be any gas driven component, such as an impeller. The rotary support 4 may be, for example, a hollow rotary shaft. Fig. 1 is a schematic view illustrating a plurality of separation blades as the separator 3.
As shown in fig. 1, a housing 1 of the oil-gas separator provided by the present invention is provided with a first gas inlet 7, a second gas inlet 8, a first gas outlet 9, a second gas outlet 10, and an oil return line 12.
The first air inlet 7 and the first air outlet 9 are both communicated with the separation cavity 5, and the first air inlet 7 is connected with an air outlet of a crankcase of the engine, so that an oil-gas mixture in the crankcase of the engine can be discharged into the separation cavity 5 of the oil-gas separator. The height of the first gas inlet 7 on the shell 1 is higher than that of the first gas outlet 9, so that the oil-gas mixture in the separation chamber 5 can be sufficiently separated, and then the separated gas can be discharged through the first gas outlet 9. For example, in the case that the separating member 3 is composed of a plurality of separating blades, the first gas inlet 7 may be located at the top of the separating chamber 5, so that the gas-oil mixture may pass through each separating blade in the separating chamber 5, thereby sufficiently separating the gas-oil mixture entering the separating chamber 5.
Of course, the first air inlet 7 and the first air outlet 9 may also adopt other arrangement modes, so that the oil-gas mixture entering the separation chamber 5 can be fully separated by the separating member 3 and then discharged from the first air outlet 9. For example, the first air inlet 7 may be lower than the first air outlet 9, or the first air inlet 7 may be disposed opposite to the first air outlet 9, and the present invention is not limited thereto.
The second air inlet 8 and the second air outlet 10 are communicated with the driving cavity 6, and the second air inlet 8 is connected with the gas storage device stored with gas, so that the gas in the gas storage device can enter the driving cavity 6, and further the driving piece 2 in the driving cavity 6 rotates under the pushing of the gas. Alternatively, the gas for rotating the oil separator driver 2 may be air, for example, or another gas capable of rotating the driver 2 (the gas may be a gas that is not polluting to the environment, for example). It should be understood that the height of the second gas inlet 8 and the second gas outlet 10 on the gas-oil separator shell 1 is not limited by the present application, that is, the height of the second gas inlet 8 on the shell 1 may be higher than the second gas outlet 10, may be lower than the second gas outlet 10, or may be the same as the height of the second gas outlet 10 on the shell 1. For example, the second gas inlet 8 and the second gas outlet 10 may be disposed opposite to each other to improve the driving effect of the gas on the driving member 2.
The rotating support member 4 of the oil-gas separator provided by the invention is of a hollow structure, and through holes 11 (one or more, when the through holes 11 are multiple, the multiple through holes 11 can be uniformly distributed, for example, fig. 1 exemplarily shows the position of one through hole 11) are arranged on the side wall of the rotating support member 4 near the bottom of the separation cavity 5, so that the engine oil separated from the oil-gas mixture can flow into the rotating support member 4 through the through holes 11, and then the engine oil can flow to the bottom of the rotating support member 4 under the action of gravity. The bottom of the rotating support 4 is connected to one end of a return line 12, and the other end of the return line 12 passes through the bottom of the drive chamber 6 and is connected to an oil pan (not shown) of a crankcase of the engine, so as to recover the engine oil in the oil-gas mixture.
During specific implementation, gas in the gas storage device can enter the driving cavity 6 through the second gas inlet 8 of the oil-gas separator, and drives the driving piece 2 of the oil-gas separator to rotate, so that the separating piece 3 fixed on the same rotating support piece 4 with the driving piece 2 is driven to rotate, and oil-gas separation of an oil-gas mixture discharged into the separating cavity 5 from a crankcase is realized. The separated gas is then discharged through the first gas outlet 9 and the separated oil is discharged through the oil return line 12 into the oil pan of the crankcase of the engine. The oil-gas separator provided by the invention takes gas as a driving medium of the oil-gas separator, and engine oil is not needed to be used as the driving medium, so that abrasion caused by insufficient lubrication of parts needing engine oil lubrication is avoided. In addition, the engine oil returned to the oil pan of the crankcase of the engine by the oil-gas separator is only the engine oil separated from the oil-gas mixture and is independently returned, so that the risks of unsmooth oil return of the oil-gas separator and engine oil spraying are reduced.
For the oil-gas separator provided by the present invention, fig. 2 is a schematic structural diagram of an oil-gas separation system provided by the present invention. As shown in fig. 2, the system includes: engine, drying device, gas storage device, valve. Wherein, this engine includes: an Electronic Control Unit (ECU), an air-oil separator, an air compressor, and a crankcase as shown in fig. 1. It should be understood that fig. 2 is only an exemplary illustration of a part of the structure of the engine related to the present invention, and no limitation is made on whether the engine in the oil-gas separation system further includes other components.
The air compression device is used for compressing air collected by the engine, so that the air becomes compressed air for subsequent use. Since the components of the air compressor require oil lubrication during the air compression process (for example, the components of the air compressor that move as a piston require oil lubrication), the oil may be mixed with the air, and if the compressed air mixed with the oil is directly discharged, air pollution may result. Therefore, the system further comprises a drying device after the air compressing device, i.e. the air outlet of the air compressing device is connected with the air inlet of the drying device. The drying device is used for drying the compressed air output by the air compression device. The drying process includes filtering the engine oil in the compressed air to reduce the engine oil content in the compressed air, thereby achieving the effect of reducing pollutant emissions. The air outlet of the drying device is connected with the air inlet of the air storage device, and compressed air after drying treatment is conveyed to the air storage device. The air storage device is used for storing compressed air for other parts. For example, an air brake system of an automobile can use the compressed air to control the brake of the automobile, and the compressed air can be used for powering an oil-gas separator to perform oil-gas separation and the like. The air outlet of the air storage device can be connected with the second air inlet 8 of the oil-gas separator shown in fig. 1 through an air duct, so that compressed air can be output to the driving cavity 6 of the oil-gas separator, and the driving part 2 of the oil-gas separator can be driven to rotate by using air.
As shown in fig. 2, the air outlet of the crankcase is connected with the first air inlet 7 of the air-oil separator, so that the air-oil mixture in the crankcase enters the separation chamber 5 of the air-oil separator through the first air inlet 7 of the air-oil separator. The oil-gas mixture is separated into oil and gas in the separation chamber 5 of the oil-gas separator, wherein the separated gas can be discharged from the first gas outlet 9 of the oil-gas separator (for example, to the atmosphere). The oil return line 12 of the gas-oil separator is connected to the crankcase sump of the engine so that the separated oil is returned to the sump.
In the prior art, the quantity of the engine oil for driving the impeller to rotate is uncontrollable aiming at the oil-gas separator driven by the engine oil. The larger the engine oil amount is, the faster the impeller rotating speed of the oil-gas separator is, and if the engine oil amount is too large, the rotating speed of the impeller is possibly too fast, namely, the rotating speed of the rotating shaft is too fast, and further the rotating shaft is possibly damaged. If the engine oil amount is insufficient, the rotating speed of the impeller is possibly too slow, namely the rotating speed of the rotating shaft is too slow, so that the oil-gas separation strength is insufficient, and the oil-gas separator cannot meet the requirement of the engine on the oil-gas separation strength under a specific operation working condition.
In this embodiment, the air duct is provided with a valve, the opening degree of the valve is different, and the amount of compressed air entering the driving cavity 6 of the oil-gas separator is different. Wherein the opening of the valve can be controlled by an electronic control unit. The output end of the electronic control unit is connected with the control end of the valve so as to control the opening of the valve.
The following is a detailed description of how the electronic control unit controls the opening of the valve based on the operating conditions of the engine.
FIG. 3 is a flow chart schematic diagram of a control method of an oil-gas separator provided by the invention. The execution subject of the method may be an electronic control unit of the engine as shown in fig. 2. As shown in fig. 3, the method comprises the steps of:
and S101, obtaining the operation condition of the engine.
The operating conditions of the engine may be indicative of the amount of the air/fuel mixture being discharged from the crankcase.
For example, the greater the engine speed, the greater the amount of combustion exhaust gas produced when the engine combusts fuel, and the greater the amount of air/fuel mixture that is discharged from the crankcase. For another example, the greater the amount of blow-by gases from the engine cylinders, the greater the amount of unburned combustible fuel mixture entering the crankcase, and the greater the amount of air-fuel mixture exiting the crankcase. Thus, the operating condition of the engine may be, for example, the engine speed and/or the amount of air leakage from the engine cylinders.
And S102, controlling the opening of the valve according to the running working condition of the engine so as to adjust the separation strength of the oil-gas separator.
For example, after the operation condition of the engine is obtained, the electronic control unit may directly control the opening of the valve according to a preset operation condition of the engine and a mapping relation of the opening of the valve.
For example, the electronic control unit may further obtain the pressure of the gas delivered to the oil-gas separator by the gas storage device according to a mapping relationship between a preset operation condition and the gas pressure after the obtained operation condition of the engine, and then control the opening of the valve according to the pressure of the gas delivered to the oil-gas separator by the gas storage device. For example, taking the operating condition of the engine as the rotation speed of the engine as an example, table 1 is an example of a mapping relationship among the rotation speed of the engine, the gas pressure, and the valve opening.
TABLE 1
Figure BDA0002786062630000091
Figure BDA0002786062630000101
Alternatively, the mapping relationship between the preset operation condition and the gas pressure may be stored in the engine ECU in advance (for example, may be stored in the engine ECU in the engine development stage). For example, the mapping relationship may be determined through manual experience, or calibrated through experiments.
In addition, the separation strength of the oil-gas separator can be further matched with the oil content of gas obtained by separating the oil-gas mixture from the oil-gas separator, so that the oil-gas separation effect is further improved. For example, under the same working condition, taking the first value smaller than the second value as an example, when the oil content in the gas discharged from the first gas outlet 9 of the oil-gas separator is set to be lower than the first value, the separation strength of the oil-gas separator is greater than the separation strength when the oil content is lower than the second value.
As the engine operating time increases, the performance of the engine gradually degrades, resulting in a gradual increase in the amount of air/fuel mixture that is crankcase scavenged by the engine under the same operating conditions. In addition, the oil-gas separator has gradually reduced oil-gas mixture separating capacity under the same separating strength. Therefore, in some embodiments, the electronic control unit may further calibrate the operation condition of the engine based on the operation time of the engine before acquiring the pressure of the gas delivered from the gas storage device to the gas-oil separator. And then acquiring the pressure of the gas transmitted to the oil-gas separator by the gas storage device by using the calibrated operating condition.
For example, the operating conditions of the engine are multiplied by a decay coefficient (which may be a real number greater than or equal to 1, for example) that is positively correlated with the operating time. I.e. the longer the running time, the larger the fading coefficient.
By the mode, the accuracy of acquiring the pressure of the gas transmitted from the gas storage device to the oil-gas separator can be improved.
Optionally, the ECU may further store a maximum value of the gas pressure, that is, the pressure of the gas delivered from the gas storage device to the gas-oil separator is controlled not to exceed the maximum value, so as to avoid wear of the device caused by an excessively fast rotation speed of the rotation support 4 in the gas-oil separator. Specifically, the maximum value of the gas pressure may be determined manually in accordance with the wear resistance of the oil separator rotation support 4, for example, and stored in advance in the ECU. Alternatively, the ECU may store therein the correspondence relationship between the maximum value of the gas pressure and the wear resistance of the rotary support 4 of the oil separator. As the operating time of the oil separator increases, the wear resistance of the rotary support 4 thereof gradually deteriorates, resulting in a decrease in the maximum rotational speed that the rotary support 4 can withstand. Therefore, in some embodiments, the electronic control unit may also calibrate the wear resistance of the rotating support 4 based on the operating time of the gas-oil separator before acquiring the maximum value of the gas pressure. The maximum value of the gas pressure is then obtained using the wear resistance of the calibrated rotating support 4. For example, the initial wear resistance of the rotating support 4, which may be related to the material constituting the rotating support 4, may be stored in the ECU. In operation after the gas-oil separator, the wear resistance of the rotating support 4 is inversely related to the operating time of the gas-oil separator, i.e. the longer the operating time, the smaller the wear resistance of the rotating support 4 and the smaller the corresponding maximum value of the gas pressure.
If the value of the gas pressure obtained by the electronic control unit according to the mapping relationship between the engine operating condition and the gas pressure is greater than the maximum value, for example, the electronic control unit may use the maximum value as the gas pressure, and then control the opening degree of the valve according to the maximum value. Alternatively, the electronic control unit may also randomly determine the gas pressure within a certain range of values less than the maximum value. This value can range, for example, from 80% to 100% of the maximum value. Of course, the electronic control unit may also directly obtain the gas pressure according to the mapping relationship between the engine operating condition and the gas pressure without judging whether the gas pressure is greater than the maximum value, and further control the opening of the valve, so as to meet the requirement of the engine on the separation strength of the oil-gas separator under the specific operating condition.
For the valve arranged on the gas-guide tube between the gas storage device and the first gas inlet 7 of the gas-oil separator, the valve can be any valve with the opening controlled by the ECU, such as a pressure reducing valve, an electric butterfly valve, an electric ball valve, etc. For example, the output end of the electronic control unit is connected with the control end of the valve to control the opening of the valve, for example, the electronic control unit controls the opening of the pressure reducing valve to adjust the separation strength of the oil-gas separator. Optionally, the valve may further comprise an air filter, and/or an oil mist device. The air filter is used for filtering liquid impurities (such as engine oil) in gas transmitted to the oil-gas separator by the gas storage device. The application of the air filter further reduces the pollution to the environment because the compressed air can be directly discharged to the air through the second air outlet 10 of the oil separator after the driving member 2 for driving the oil separator rotates. The oil atomizer is used for lubricating the valve, for example, the opening and closing processes of the valve of the pressure reducing valve need to be lubricated, so that abrasion among internal parts of the pressure reducing valve is avoided, the timeliness of opening adjustment of the valve is further guaranteed, and the service life of the valve is prolonged. In some embodiments, the valve containing the pressure reducing valve, the air filter and the oil atomizer can also be referred to as an electric triple valve.
In the embodiment, considering that the engine has different requirements on the separation strength of the oil-gas separator under different operating conditions, the opening of the valve is adjusted according to the operating conditions of the engine, so that the control on the quantity of the gas entering the oil-gas separator driving cavity 6 from the gas storage device is realized, the control on the rotating speed of the oil-gas separator separating piece 3 is further realized, and the control on the separation strength of the oil-gas separator is further realized. By the control method, abrasion of the rotating support piece 4 of the oil-gas separator due to over-high rotating speed is avoided, and the problem that the oil-gas mixture is not well separated due to insufficient separation strength of the oil-gas separator under the specific operation working condition of the engine is also avoided. Fig. 4 is a schematic structural diagram of a control device of an oil-gas separator provided by the invention. As shown in fig. 4, the apparatus includes:
the obtaining module 201 is used for obtaining the operation condition of the engine.
And the processing module 202 is used for controlling the opening of the valve according to the operation condition of the engine so as to adjust the separation strength of the oil-gas separator.
Optionally, the processing module 202 is specifically configured to obtain a pressure of gas delivered from the gas storage device to the oil-gas separator according to an operating condition of the engine and a mapping relationship between a preset operating condition and a gas pressure; and controlling the opening of the valve according to the pressure of the gas transmitted to the oil-gas separator by the gas storage device.
The control device of the oil-gas separator provided by the invention is used for executing the embodiment of the control method of the oil-gas separator shown in fig. 3, for example, the implementation principle and the technical effect are similar, and the details are not repeated.
Fig. 5 is a schematic structural diagram of an electronic control unit according to the present invention. As shown in fig. 5, the electronic control unit 300 may include: at least one processor 301 and a memory 302.
A memory 302 for storing programs. In particular, the program may include program code including computer operating instructions.
Memory 302 may comprise high-speed RAM memory and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 301 is used for executing computer-executable instructions stored in the memory 302 to realize the control method of the oil separator. The processor 301 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention.
Optionally, the electronic control unit 300 may further include a communication interface 303. In a specific implementation, if the communication interface 303, the memory 302 and the processor 301 are implemented independently, the communication interface 303, the memory 302 and the processor 301 may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. Buses may be classified as address buses, data buses, control buses, etc., but do not represent only one bus or type of bus.
Alternatively, in a specific implementation, if the communication interface 303, the memory 302 and the processor 301 are integrated into a chip, the communication interface 303, the memory 302 and the processor 301 may complete communication through an internal interface.
The present invention also provides a computer-readable storage medium, which may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and in particular, the computer-readable storage medium stores program instructions, and the program instructions are used in the method in the foregoing embodiments.
The present invention also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the electronic control unit may read the execution instructions from the readable storage medium, and the execution of the execution instructions by the at least one processor causes the electronic control unit to implement the above-described control method of the oil separator, such as shown in fig. 3.
The present invention also provides a vehicle including an oil and gas separation system, which may be configured, for example, as shown in fig. 2.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. An oil and gas separator, characterized in that the oil and gas separator comprises: the device comprises a shell, a driving piece, a separating piece and a rotating supporting piece;
a separation cavity and a driving cavity are arranged in the shell, the separation cavity is positioned at the upper part of the driving cavity, the separation piece is positioned in the separation cavity, the driving piece is positioned in the driving cavity, the rotating supporting piece penetrates through the separation cavity and the driving cavity, and the driving piece and the separation piece are both fixed on the rotating supporting piece;
the shell is provided with a first air inlet, a second air inlet, a first air outlet, a second air outlet and an oil return pipeline, and the height of the first air inlet on the shell is higher than that of the first air outlet; the first air inlet and the first air outlet are both communicated with the separation cavity, the second air inlet and the second air outlet are both communicated with the driving cavity, the first air inlet is connected with an air outlet of a crankcase of an engine, and the second air inlet is connected with an air storage device storing air;
the rotating support piece is of a hollow structure, a through hole is formed in the side wall of the rotating support piece, which is close to the bottom of the separation cavity, the bottom of the rotating support piece is connected with one end of the oil return pipeline, and the other end of the oil return pipeline penetrates through the bottom of the driving cavity and is connected with an oil pan of a crankcase of the engine;
when the gas storage device conveys gas to the driving cavity through the second gas inlet, the gas drives the driving piece to rotate so as to drive the separating piece to carry out oil-gas separation on the oil-gas mixture discharged into the separating cavity from the crankcase, so that the separated gas is discharged through the first gas outlet, and the separated engine oil is discharged into an oil pan of the engine crankcase through the oil return pipeline.
2. An oil and gas separation system, the system comprising: the device comprises an engine, a drying device, a gas storage device and a valve; the engine includes: an electronic control unit, an oil-gas separator according to claim 1, an air compression device and a crankcase;
the air outlet of the air compression device is connected with the air inlet of the drying device, the air outlet of the drying device is connected with the air inlet of the air storage device, the air outlet of the air storage device is connected with the second air inlet of the oil-gas separator through an air duct, the air outlet of the crankcase is connected with the first air inlet of the oil-gas separator, and the oil return pipeline of the oil-gas separator is connected with the oil pan of the crankcase of the engine;
the valve is arranged on the air guide pipe, and the output end of the electronic control unit is connected with the control end of the valve;
the drying device is used for drying the compressed air output by the air compression device and conveying the compressed air to the air storage device;
the electronic control unit is used for controlling the opening of the valve according to the operation condition of the engine so as to adjust the separation strength of the oil-gas separator;
the electronic control unit is specifically configured to:
acquiring the pressure of gas conveyed to the oil-gas separator by the gas storage device according to the operating condition of the engine and the mapping relation between the preset operating condition and the gas pressure;
and controlling the opening of the valve according to the pressure of the gas transmitted to the oil-gas separator by the gas storage device.
3. The system of claim 2, wherein the valve comprises a pressure relief valve;
the electronic control unit is specifically used for controlling the opening of the pressure reducing valve so as to adjust the separation strength of the oil-gas separator.
4. The system of claim 3, wherein the valve further comprises: an air filter;
the air filter is used for filtering liquid impurities in the gas transmitted to the oil-gas separator by the gas storage device.
5. The system of claim 3 or 4, wherein the valve further comprises: an oil atomizer;
the oil atomizer is used for lubricating the valve.
6. A vehicle, characterized in that the vehicle comprises an oil and gas separation system according to any one of claims 2-5.
7. A method for controlling an oil-gas separator, which is used for controlling the oil-gas separation system as claimed in claim 2, wherein the valve is positioned on a gas guide pipe connecting an air outlet of the gas storage device and a second air inlet of the oil-gas separator; the method comprises the following steps:
acquiring the operating condition of an engine;
and controlling the opening of the valve according to the running working condition of the engine so as to adjust the separation strength of the oil-gas separator.
8. The method according to claim 7, wherein the controlling the opening degree of the valve according to the operation condition of the engine to adjust the separation strength of the oil separator comprises the following steps:
acquiring the pressure of gas conveyed to the oil-gas separator by a gas storage device according to the operating condition of the engine and the mapping relation between the preset operating condition and the gas pressure;
and controlling the opening of the valve according to the pressure of the gas transmitted to the oil-gas separator by the gas storage device.
9. An electronic control unit, comprising: at least one processor, a memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the electronic control unit to perform the method of claim 7 or 8.
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