CN114033526B - Oil-gas separator and control method thereof - Google Patents
Oil-gas separator and control method thereof Download PDFInfo
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- CN114033526B CN114033526B CN202111433786.2A CN202111433786A CN114033526B CN 114033526 B CN114033526 B CN 114033526B CN 202111433786 A CN202111433786 A CN 202111433786A CN 114033526 B CN114033526 B CN 114033526B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0411—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil using cooling means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0461—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with a labyrinth
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0472—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil using heating means
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of oil-gas separation, and discloses an oil-gas separator and a control method thereof. The oil-gas separator and the control method thereof provided by the invention are provided with the temperature detection unit and the heat exchange unit, the temperature of the fluid in the separation cavity of the oil-gas separator is detected by the temperature detection unit, when the temperature of the fluid in the oil-gas separator is higher, the heat exchange unit is controlled to cool the fluid in the separation cavity on the basis of oil-gas separation by utilizing the oil-gas separation principle of the oil-gas separator, so that the physical characteristic of cooling and condensation is utilized, the oil mist in the oil-gas mixture is rapidly condensed into oil, the oil-gas separation efficiency is improved, and the separation effect is ensured.
Description
Technical Field
The invention relates to the technical field of oil-gas separation, in particular to an oil-gas separator and a control method thereof.
Background
When the engine is normally operated, a part of the unburned combustible mixture and the combustion exhaust gas in the cylinder are blown into the crankcase through a plurality of paths. These blow-by gases raise the temperature of the fluid in the crankcase, increasing the amount of oil evaporated in the sump. Because some parts in the crankcase adopt splash lubrication, oil mist generated by the splash lubrication in the crankcase, oil vapor evaporated at high temperature and cylinder blow-by gas are mixed to form ultra-fine aerosol with most particles with the particle size smaller than 1 mu m, so that oil-gas mixture is generated in the crankcase blow-by gas, and the lubricating effect of the parts in the crankcase is influenced.
For this reason, a ventilation system is usually provided in the crankcase, in which an oil-gas separator is provided to separate the lubricating oil in the crankcase blow-by gas with high efficiency, and the separation performance of the oil-gas separator has an important influence on the reliability and emission of the engine.
The current oil-gas separator is roughly classified into the following types: the oil-gas separator comprises a centrifugal oil-gas separator, a volumetric oil-gas separator, a cyclone oil-gas separator and a baffle plate oil-gas separator, wherein the centrifugal oil-gas separator has higher cost and large volume; the volumetric oil-gas separator, the cyclone oil-gas separator and the baffle plate oil-gas separator have the advantage of low cost, but the separation effect is relatively poor.
In order to solve the technical problems and realize high-efficiency filtration, the prior art generally adopts a mode of serially connecting a plurality of stages of non-centrifugal separators, but the occupied space is increased, the pressure of a crankcase is increased, and the performance and the reliability of an engine are influenced.
Disclosure of Invention
The invention aims to provide an oil-gas separator and a control method thereof, wherein the oil-gas separator is simple in structure and low in cost, and the separation efficiency of the oil-gas separator is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
an oil-gas separator comprising:
the separator comprises a separator body, a gas inlet, a gas outlet, a gas return port and a gas return port, wherein the separator body is provided with a separation cavity, and the gas outlet, the gas inlet and the gas return port are communicated with the separation cavity;
the oil and gas separator further includes:
the temperature detection unit is used for detecting the temperature of the fluid in the separation cavity;
and the heat exchange unit is used for cooling the fluid in the separation cavity according to the detection result of the temperature detection unit.
As an optional technical scheme of the oil-gas separator, the separator body is made of metal.
As an optional technical scheme of the oil-gas separator, the heat exchange unit is a heat pump system.
As an optional technical solution of the above oil-gas separator, the cross section of the separation cavity is circular, and the gas inlet is a tangential gas inlet channel or a helical gas inlet channel, and is configured to enable the fluid introduced into the separation cavity through the gas inlet to rotate in the separation cavity and simultaneously advance to the gas outlet;
the heat exchange unit comprises a medium channel which is arranged on the separator body and is not communicated with the separation cavity, and the medium channel is used for circulating a refrigerant.
As an optional technical scheme of the oil-gas separator, a labyrinth passage is arranged on the inner wall of the separation cavity, two ends of the labyrinth passage are respectively communicated with the gas outlet and the gas inlet, and the oil return port is communicated with one end of the labyrinth passage;
the heat exchange unit comprises a medium channel which is arranged on the solid structure forming the labyrinth channel and is not communicated with the separation cavity, and the medium channel is used for circulating a refrigerant.
As an optional technical scheme of the oil-gas separator, a plurality of first baffles are convexly arranged on the inner peripheral wall of the separation cavity, and the plurality of first baffles are distributed in a staggered manner to form the labyrinth passage with the inner wall of the separation cavity;
or, the separation intracavity sets firmly rather than coaxial installation base member, the protruding a plurality of first baffles that are equipped with along its axial and circumference array distribution of inner wall in separation chamber, the protruding a plurality of second baffles that are equipped with along its axial and circumference array distribution of periphery wall of installation base member, it is a plurality of first baffle and a plurality of second baffle staggered distribution with the inner wall in separation chamber encloses into the labyrinth passageway.
The invention also provides a control method of the oil-gas separator, which comprises the following steps:
when an engine works, acquiring the temperature of fluid in a separation cavity of the oil-gas separator;
when the temperature of the fluid in the separation cavity is higher than a first preset temperature, the heat exchange unit is controlled to work so as to cool the fluid in the separation cavity.
As an optional technical scheme of the control method of the oil-gas separator, when the temperature of the fluid in the separation cavity is lower than a second preset temperature, the heat exchange unit is controlled to work to heat the fluid in the separation cavity;
the second preset temperature is less than the first preset temperature.
As an optional technical solution of the control method of the oil-gas separator, the controlling the heat exchange unit to work to cool the fluid in the separation cavity includes:
acquiring piston air leakage, and inquiring target working temperature corresponding to the piston air leakage based on a mapping relation between the piston air leakage and the target working temperature of the oil-gas separator under the target separation efficiency;
and when the temperature of the fluid in the separation cavity reaches the inquired target working temperature, controlling the heat exchange unit to stop working.
As an optional technical solution of the control method of the oil-gas separator, the acquiring of the piston air leakage includes:
acquiring the actual rotating speed of the engine and the actual output torque of the engine;
and inquiring the piston air leakage corresponding to the actual rotating speed of the engine and the actual output torque of the engine based on the mapping relation between the rotating speed of the engine and the output torque of the engine and the piston air leakage.
As an optional technical solution of the control method for the oil-gas separator, before querying a target operating temperature corresponding to the piston air leakage based on a mapping relationship between the piston air leakage and the target operating temperature of the oil-gas separator under the target separation efficiency, the method further includes:
acquiring the temperature of the engine oil before cooling, and inquiring a piston air leakage correction coefficient corresponding to the temperature of the engine oil before cooling based on the mapping relation between the temperature of the engine oil before cooling and the piston air leakage correction coefficient; or acquiring the temperature of the cooled engine oil and the temperature difference of the cooling liquid before and after the engine oil is cooled, and inquiring the piston air leakage correction coefficient corresponding to the temperature of the cooled engine oil and the temperature difference of the cooling liquid before and after the engine oil is cooled based on the mapping relation between the temperature of the cooled engine oil and the temperature difference of the cooling liquid before and after the engine oil is cooled and the piston air leakage correction coefficient;
calculating to obtain the corrected piston air leakage according to the piston air leakage obtained by query and the piston air leakage correction coefficient obtained by query;
and inquiring the target working temperature corresponding to the corrected piston air leakage amount based on the mapping relation between the piston air leakage amount and the target working temperature of the oil-gas separator under the target separation efficiency.
The invention has the beneficial effects that: the oil-gas separator and the control method thereof provided by the invention are provided with the temperature detection unit and the heat exchange unit, the temperature of the fluid in the separation cavity of the oil-gas separator is detected by the temperature detection unit, when the temperature of the fluid in the oil-gas separator is higher, the heat exchange unit is controlled to cool the fluid in the separation cavity on the basis of oil-gas separation by utilizing the oil-gas separation principle of the oil-gas separator, so that the physical characteristic of cooling and condensation is utilized, the oil mist in the oil-gas mixture is rapidly condensed into oil, the oil-gas separation efficiency is improved, and the separation effect is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a sectional view of an oil separator according to an embodiment of the present invention;
FIG 2 is a first flowchart of a first method for controlling an oil-gas separator according to a first embodiment of the present invention;
FIG. 3 is a second flowchart of a control method for an oil-gas separator according to a first embodiment of the invention;
FIG. 4 is a block diagram of an oil separator control system provided by the first embodiment of the invention;
FIG. 5 is a sectional view of an oil separator according to a second embodiment of the present invention;
FIG. 6 is a cross-sectional view of an oil separator provided in accordance with other embodiments of the present invention;
FIG. 7 is a cross-sectional view at A in FIG. 6;
fig. 8 is a cross-sectional view at B in fig. 6.
In the figure:
11. a separator body; 110. a separation chamber; 111. an air inlet; 112. an air outlet; 113. an oil return port; 12. a first baffle plate; 13. a second baffle; 14. installing a base body; 141. an oil return hole;
2. a media channel.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
Example one
The embodiment provides an oil-gas separator which can be a labyrinth type oil-gas separator or a cyclone type oil-gas separator, but is not limited to the two types of oil-gas separators. In this embodiment, a cyclone type oil-gas separator is taken as an example, and the structure of the oil-gas separator is described.
As shown in fig. 1, the cyclone oil-gas separator includes a separator body 11, the separator body 11 has a separation chamber 110, and an air outlet 112, an air inlet 111 and an oil return 113 which are all communicated with the separation chamber 110, the oil return 113 is provided at the bottom of the separator body 11, one of the air inlet 111 and the air outlet 112 is located at the upper part of the separator body 11, and the other is located at the lower part of the separator body 11. Illustratively, the air outlet 112 and the air inlet 111 are located on the same side of the separator body 11 and the air outlet 112 is located above the air inlet 111. In other embodiments, the air outlet 112 and the air inlet 111 may be disposed on different sides of the separator body 11, and the air outlet 112 may be disposed below the air inlet 111. It should be noted that, for the cyclone oil separator and the plate oil separator, since there is no external power for the two oil separators, it is preferable to dispose the air outlet 112 above the air inlet 111.
For the cyclone type oil separator, the cross section of the separation chamber 110 is circular, and the gas inlet 111 is a tangential inlet or a helical inlet for rotating the fluid introduced into the separation chamber 110 through the gas inlet 111 in the separation chamber 110 and simultaneously traveling toward the gas outlet 112.
The fluid entering the separation chamber 110 is oil-gas mixture, and after the oil-gas mixture enters the separation chamber 110 through the gas inlet 111, the oil-gas mixture rotates in the separation chamber 110 and simultaneously moves towards the gas outlet 112, and the oil-gas separation is realized by using the centrifugal force generated by the rotation of the oil-gas mixture in the separation chamber 110, so that the external power supply is not needed, the structure is simple, and the cost is low. In order to improve the separation efficiency, at least two cyclone-type oil-gas separators can be used in series, namely, the air outlet 112 of the upstream oil-gas separator is communicated with the air inlet 111 of the downstream oil-gas separator. When the pressure drop is required to be small, at least two cyclone type oil-gas separators can be used in parallel, namely the gas inlets 111 of all the oil-gas separators are communicated, and the gas outlets 112 of all the oil-gas separators are communicated.
Further, the bottom of the separator body 11 is of a funnel structure, and the oil return port 113 is arranged at the lowest position of the funnel structure, so that the separated oil can flow to the oil return port 113 along the inner wall of the funnel structure and can be discharged through the oil return port 113.
Further, in order to improve the separation efficiency of the oil-gas separator, the oil-gas separator provided by the embodiment further includes a temperature detection unit and a heat exchange unit, wherein the temperature detection unit is used for detecting the temperature of the fluid in the separation chamber 110; the heat exchange unit is used for cooling the fluid in the separation chamber 110 according to the detection result of the temperature detection unit. The temperature detection unit can be a temperature sensor, a thermocouple or other structures with temperature measurement functions, and is not limited in detail.
When the temperature of the fluid in the oil-gas separator is high, the heat exchange unit is controlled to cool the fluid in the separation cavity 110 on the basis of oil-gas separation by using the oil-gas separation principle of the oil-gas separator, so that the physical characteristics of cooling and condensation are utilized, the oil mist in the oil-gas mixture is rapidly condensed into oil, the oil-gas separation efficiency is improved, and the separation effect is ensured.
Specifically, the heat exchange unit includes a medium channel 2 that is disposed on the separator body 11 and is not communicated with the separation cavity 110, and the medium channel 2 is used for circulating a refrigerant. Illustratively, the media channels 2 are provided in the circumferential side wall of the separation chamber 110. When the refrigerant with the temperature higher than that of the fluid in the separation cavity 110 flows in the medium channel 2, the refrigerant exchanges heat with the oil-gas mixture in the separation cavity 110, so that the temperature of the fluid in the separation cavity 110 is reduced, oil mist in the oil-gas mixture is gradually condensed into oil along with the reduction of the temperature in the separation cavity 110, and the oil-gas separation characteristic of the oil-gas separator is matched, so that the separation efficiency of the oil-gas separator is greatly improved.
It should be noted that the medium channel 2 may be directly machined on the separator body 11, and a heat exchange housing having the medium channel 2 may also be machined and fixedly installed on the inner peripheral wall of the separation chamber 110. Preferably, the heat exchange housing and the separator body 11 are integrally formed.
Further, in order to increase the rate of cooling the oil separator at high temperature, the separator body 11 is made of metal. When the fluid in the oil-gas separator is cooled, the separator body 11 made of metal can also make part of heat be dissipated to the external atmosphere through the separator body 11, so that the cooling rate is improved.
Further, when the ambient temperature is low, the temperature of the fluid in the gas-oil separator may be low, and it is known that the lower the temperature, the greater the viscosity of the engine oil, the greater the flow resistance, and the problem of difficult oil return in the gas-oil separator may be caused. Therefore, the heat exchange unit is set as a heat pump system, so that the heat exchange unit can switch between heating and cooling of the fluid in the separation cavity 110. When the temperature of the fluid in the separation chamber 110 is low, the heat exchange unit is controlled to heat the fluid in the separation chamber 110, so that the viscosity of the separated oil is reduced, the separated oil can be smoothly discharged through the oil return port 113, and the oil-gas separator can continuously and effectively work.
The embodiment also provides a control method for the oil-gas separator, which ensures that the oil-gas separator returns oil smoothly on the premise of improving the separation efficiency of the oil-gas separator.
Specifically, as shown in fig. 2, the control method of the oil-gas separator includes the steps of:
s1, acquiring the temperature of fluid in a separation cavity 110 of the oil-gas separator when the engine works.
The engine works normally, namely an oil-gas separator is needed for oil-gas separation; and stopping the engine, and stopping the oil-gas separator for oil-gas separation. For this reason, it is possible to determine whether the oil separator is operated by judging whether the engine is operated. It is not described herein in detail how to determine whether an engine is operating as prior art in the field.
The method for obtaining the temperature of the fluid in the separation chamber 110 of the oil-gas separator is a commonly used method for detecting the temperature of the fluid in real time through a temperature detection unit such as a temperature sensor or a thermocouple.
S2, judging whether the temperature of the fluid in the separation cavity 110 is lower than a second preset temperature or not; if yes, executing S3, otherwise executing S4.
The second preset temperature refers to a temperature at which the oil liquid separated by the oil-gas separator has high viscosity and can affect the oil return of the oil-gas separator, and the specific value of the second preset temperature can be determined through repeated tests.
And S3, controlling the heat exchange unit to work to heat the fluid in the separation cavity 110, and returning to S2.
At low ambient temperatures, the temperature of the fluid in the air-oil separator may be low, and it is known that the lower the temperature, the greater the viscosity of the oil and the greater the flow resistance. Therefore, when the temperature of the fluid in the separation chamber 110 is lower than the second preset temperature, it is described that the viscosity of the oil separated by the oil-gas separator is relatively high, which may affect the oil return of the oil-gas separator, and it is necessary to increase the temperature of the fluid in the separation chamber 110, reduce the viscosity of the engine oil, and enable the separated oil to be smoothly discharged through the oil return port 113.
S4, judging whether the temperature of the fluid in the separation cavity 110 is higher than a first preset temperature or not; if not, the heat exchange unit is controlled not to work, and if yes, S5 is executed.
And S5, controlling the heat exchange unit to work so as to cool the fluid in the separation cavity 110.
Because the separation effect when only utilizing traditional oil-gas separator's self oil-gas separation principle to carry out oil-gas separation is not good, when the fluid temperature in the disengagement chamber 110 is higher than first preset temperature, can be on the basis of utilizing oil-gas separator's self oil-gas separation principle to carry out oil-gas separation, control heat exchange unit cools down to the fluid in the disengagement chamber 110, realize utilizing the physical characteristic of cooling condensation, make the oil mist in the gas-oil mixture condense into fluid fast, improve oil-gas separation efficiency, guarantee the separation effect.
It should be noted that the first preset temperature is greater than the second preset temperature, and the first preset temperature may be a known value determined through repeated experiments.
In step 5, when the heat exchange unit is controlled to work to cool the fluid in the separation chamber 110, and when the temperature of the fluid in the oil-gas separator is reduced to a target working temperature, the heat exchange unit is controlled to stop working, wherein the second preset temperature is less than or equal to the target working temperature and less than or equal to the first preset temperature.
The temperature of the fluid in the separation chamber 110 is not higher than the first preset temperature and not lower than the second preset temperature, which indicates that the effect of continuously cooling and condensing to improve the oil-gas separation is not great, and the viscosity of the separated oil is easily increased, so that the problem of difficult oil return is caused, at this time, the fluid in the separation chamber 110 does not need to be heated and cooled, and the oil-gas separation can be carried out by utilizing the oil-gas separation principle of the oil-gas separator.
Next, a specific process of controlling the operation of the heat exchange unit to cool the fluid in the separation chamber 110 in step S5 will be described.
Since the piston air leakage and the working temperature of the oil-gas separator directly affect the separation efficiency of the oil-gas separator, the target working temperature of the oil-gas separator in the step S5 may be different in different piston air leakages. Piston blow-by refers to the amount of air mixture that leaks from the cylinder to the crankcase.
In order to obtain the target working temperature of the oil-gas separator, the oil-gas separator works at the target working temperature, and the separation efficiency of the oil-gas-oil separator is improved. The mapping relation (such as a map) between the piston air leakage amount and the target working temperature of the oil-gas separator under the target separation efficiency can be established in advance through repeated tests for many times, the piston air leakage amount is obtained in real time, and the target working temperature corresponding to the piston air leakage amount is inquired on the basis of the mapping relation between the piston air leakage amount and the target working temperature of the oil-gas separator under the target separation efficiency. The target separation efficiency is a determined known value, for example, when the oil-gas separator leaves a factory, a separation efficiency test of the oil-gas separator is required, and the separation efficiency is qualified until the separation efficiency meets the requirement.
The air leakage of the piston is not convenient to directly measure, and the air leakage of the piston is influenced by the operating conditions of the engine, such as the rotating speed of the engine and the output torque of the engine, so the embodiment provides the method for obtaining the air leakage of the piston based on the air leakage of the piston, the rotating speed of the engine and the output torque of the engine. The method comprises the following specific steps: the method comprises the steps of obtaining the actual rotating speed of an engine and the actual output torque of the engine, and inquiring the piston air leakage amount corresponding to the actual rotating speed of the engine and the actual output torque of the engine based on the mapping relation (such as a map) between the rotating speed of the engine and the output torque of the engine and the piston air leakage amount.
Further, the piston air leakage obtained through the query in the above manner is different from the actual piston air leakage, so that the queried piston air leakage needs to be corrected before querying the target working temperature corresponding to the piston air leakage based on the mapping relationship between the piston air leakage and the target working temperature of the oil-gas separator under the target separation efficiency.
Tests show that the air leakage of the piston is related to the temperature of the engine oil before cooling, so that the air leakage of the piston can be corrected based on the temperature of the engine oil before cooling. Specifically, a mapping relation (such as a map) between the engine oil temperature before cooling and the piston air leakage correction coefficient is established through repeated tests for many times, the engine oil temperature before cooling is obtained, the piston air leakage correction coefficient corresponding to the engine oil temperature before cooling is inquired based on the mapping relation between the engine oil temperature before cooling and the piston air leakage correction coefficient, and the corrected piston air leakage is calculated according to the inquired piston air leakage and the inquired piston air leakage correction coefficient. Illustratively, the inquired piston air leakage is Q1, the inquired piston air leakage correction coefficient is a, and the corrected piston air leakage Q2= Q1 × a.
The oil temperature before cooling is the oil temperature in the engine oil pan. The cooled engine oil temperature can also be adopted, but the cooled engine oil temperature is not only related to the engine working condition, but also related to the energy provided by the engine cooling system, and the energy provided by the engine cooling system can be measured according to the temperature difference before and after the engine oil is cooled by the cooling liquid, so that the mapping relation between the cooled engine oil temperature, the temperature difference before and after the engine oil is cooled and the piston air leakage correction coefficient can be obtained through repeated tests, the piston air leakage correction coefficient corresponding to the cooled engine oil temperature and the temperature difference before and after the engine oil is cooled can be inquired, and the corrected piston air leakage can be calculated according to the piston air leakage obtained through inquiry and the piston air leakage correction coefficient obtained through inquiry.
Exemplarily, as shown in fig. 3, step S5 is specifically as follows:
s51, acquiring the actual rotating speed of the engine and the actual output torque of the engine, and inquiring the piston air leakage amount corresponding to the actual rotating speed of the engine and the actual output torque of the engine based on the mapping relation between the rotating speed of the engine and the output torque of the engine and the piston air leakage amount.
S52, acquiring the temperature of the engine oil before cooling, and inquiring a piston air leakage correction coefficient corresponding to the temperature of the engine oil before cooling based on the mapping relation between the temperature of the engine oil before cooling and the piston air leakage correction coefficient;
s53, calculating to obtain the corrected piston air leakage according to the piston air leakage obtained through query and the piston air leakage correction coefficient obtained through query;
s53, inquiring a target working temperature corresponding to the corrected piston air leakage amount based on a mapping relation between the piston air leakage amount and the target working temperature of the oil-gas separator under the target separation efficiency;
and S54, when the temperature of the fluid in the separation cavity 110 reaches the inquired target working temperature, controlling the heat exchange unit to stop working.
It should be noted that the engine speed, the engine torque, the temperature of the engine oil before cooling, and the like mentioned in the above control method of the oil-gas separator may be measured by using existing sensors on the whole vehicle, and will not be described in detail herein.
As shown in fig. 4, in order to implement the above oil-gas separator control method, this embodiment provides an oil-gas separator control system, which includes a heat exchange unit, a temperature detection unit, and an oil-gas separator controller, where the oil-gas separator controller is in communication connection with an engine controller, the temperature detection unit, and the heat exchange unit, and the oil-gas separator controller is configured to receive a detection signal of the temperature detection unit, process the detection signal, obtain a temperature value, and send the temperature value to the engine controller; the oil-gas separator controller is further configured to receive a control instruction sent by the engine controller, such as a control instruction for controlling the heat exchange unit to heat or cool the fluid in the separation chamber 110, and a data signal indicating a target operating temperature.
The oil-gas separator controller can control the heat exchange unit to work in a PWM mode or a constant current mode, the oil-gas separator controller mainly comprises three parts which are respectively a driver, a microcontroller and a communication interface, the driver is respectively in communication connection with the microcontroller and the communication interface, the temperature detection unit is in communication with the microcontroller, and the communication interface is in communication connection with the engine controller through a communication bus.
The driver is a PWM driver or a constant current driver, and when the driver is the PWM driver, the driver controls the heat exchange unit to work in a PWM mode; when the driver is a constant current driver, the driver controls the heat exchange unit to work in a constant current mode.
The oil-gas separator controller can be directly integrated in the engine controller, or can be developed by using the existing engine controller, and can be selected according to actual conditions. The control strategy that the oil-gas separator controller is integrated in the engine controller is selected in the embodiment, so that the cost is reduced.
Example two
The present embodiment is different from the first embodiment in that the oil-gas separator is a baffle type oil-gas separator, which is also called a labyrinth type oil-gas separator.
Specifically, the inner wall of the separation chamber 110 is provided with a labyrinth passage, both ends of the labyrinth passage are respectively communicated with the air outlet 112 and the air inlet 111, and the oil return port 113 is communicated with one end of the labyrinth passage.
By arranging the labyrinth passage, the contact area of the oil-gas mixture and the oil-gas separator is increased, and the flowing direction of the fluid is forcibly changed, so that the oil mist in the fluid is separated out under the inertial impact to become oil liquid, and the separation efficiency of the oil-gas separator is improved.
Illustratively, as shown in fig. 5, the inner peripheral wall of the separation chamber 110 is convexly provided with a plurality of first baffles 12, and the plurality of first baffles 12 are distributed in a staggered manner to form a labyrinth passage with the inner wall of the separation chamber 110. The number of the first baffle plates 12 is not specifically limited, and the number of the first baffle plates 12 can be selected according to the size of the oil-gas separator and the actual installation requirement.
Optionally, the height of the first baffle 12 gradually decreases along the direction from the fixed end to the free end, so that the first baffle 12 is inclined, and the separated oil can flow downward along the first baffle 12 under the action of its own weight and is discharged from the oil return port 113.
In this embodiment, the media channel 2 is provided on a solid structure forming a labyrinth channel. The solid structure forming the labyrinth passage mainly has two parts, one part is the separator body 11, and the other part is the first baffle plate 12. Illustratively, the media passages 2 are provided in the upper and lower sidewalls of the first baffle 12. In other embodiments, the media channels 2 may also be provided on the circumferential side wall of the separator body 11.
When the refrigerant flows in the medium channel 2, the refrigerant exchanges heat with the medium in the separation cavity 110, and the oil mist in the oil-gas mixture is heated or cooled when contacting the first baffle 12.
In other embodiments, other types of labyrinth passages may be used. Specifically, as shown in fig. 6 to 8, a mounting base 14 coaxial with the separation chamber 110 is fixedly arranged in the separation chamber 110, a plurality of first baffles 12 distributed in an array along the axial direction and the circumferential direction of the inner wall of the separation chamber 110 are protruded from the inner wall of the separation chamber 110, a plurality of second baffles 13 distributed in an array along the axial direction and the circumferential direction of the outer wall of the mounting base 14 are protruded from the outer wall of the mounting base, and the plurality of first baffles 12 and the plurality of second baffles 13 are staggered to form a labyrinth passage with the inner wall of the separation chamber 110. By adopting the labyrinth passage in the form, the contact area of the oil-gas mixed gas and the oil-gas separator can be further increased, and the separation efficiency of the oil-gas separator is further improved. The number of the first baffle 12 and the second baffle 13 is not specifically limited, and the number of the first baffle 12 and the second baffle 13 may be selected according to the size of the oil-gas separator and the actual installation requirement.
Because the mounting base 14 and the separation cavity 110 are coaxial, when the bottom of the separator body 11 is of a funnel structure, the funnel structure is generally coaxial with the separation cavity 110, in order to facilitate fixing of the mounting base 14 and simultaneously avoid the mounting base 14 from blocking oil in the separation cavity 110 from entering the oil return port 113, the mounting base 14 is of a tubular structure, the lower part of the mounting base 14 penetrates through the bottom of the separator body 11, the oil return port 113 is formed at a lower port of the mounting base 14, an oil return hole 141 communicated with the separation cavity 110 is arranged at a position where the mounting base 14 is connected with the bottom wall of the separation cavity 110, and the oil return hole 141 is communicated with an inner cavity of the mounting base 14; so that the oil in the separation chamber 110 can enter the mounting base 14 through the oil return hole 141 and then be discharged from the lower port of the mounting base 14.
When the labyrinth passage shown in fig. 6 is employed, the medium passage 2 is provided on the upper and lower side walls of the first shutter 12 and the upper and lower side walls of the second shutter 13.
The first shutter 12 and the second shutter 13 in fig. 6 are both horizontally disposed. It should be noted that the height of the first baffle 12 may be gradually reduced along the direction from the fixed end to the free end thereof, and the height of the second baffle 13 may be gradually reduced along the direction from the fixed end to the free end thereof, so that the separated oil can automatically flow downward along the first baffle 12 and the second baffle 13 under the action of its own gravity and be discharged from the oil return port 113.
The control method of the oil-gas separator provided by the present embodiment is the same as that of the first embodiment, and the detailed description thereof is not repeated here.
It should be noted that, in the oil-gas separator provided by the present invention, the cyclone-type oil-gas separator used in the first embodiment has a structure, the cross section of the separation cavity 110 is defined as a circle, the gas inlet 111 is defined as a tangential gas inlet or a helical gas inlet, and meanwhile, the labyrinth passage defined in the second embodiment may also be used to further improve the oil-gas separation efficiency.
It should be understood that the above-described 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. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (8)
1. A control method of an oil-gas separator, the oil-gas separator comprising:
the separator comprises a separator body (11), wherein the separator body (11) is provided with a separation cavity (110), and an air outlet (112), an air inlet (111) and an oil return opening (113) which are communicated with the separation cavity (110), the oil return opening (113) is arranged at the bottom of the separator body (11), one of the air inlet (111) and the air outlet (112) is positioned at the upper part of the separator body (11), and the other one is positioned at the lower part of the separator body (11);
the oil and gas separator further includes:
a temperature detection unit for detecting a temperature of the fluid within the separation chamber (110);
the heat exchange unit is used for cooling the fluid in the separation cavity (110) according to the detection result of the temperature detection unit;
the method is characterized by comprising the following steps:
acquiring the temperature of fluid in a separation cavity (110) of the oil-gas separator when an engine works;
when the temperature of the fluid in the separation cavity (110) is higher than a first preset temperature, controlling the heat exchange unit to work so as to cool the fluid in the separation cavity (110);
the control of the heat exchange unit to operate to cool the fluid in the separation chamber (110) comprises:
acquiring piston air leakage, and inquiring target working temperature corresponding to the piston air leakage based on a mapping relation between the piston air leakage and the target working temperature of the oil-gas separator under the target separation efficiency;
when the temperature of the fluid in the separation cavity (110) reaches the inquired target working temperature, controlling the heat exchange unit to stop working;
before inquiring the target working temperature corresponding to the piston air leakage based on the mapping relation between the piston air leakage and the target working temperature of the oil-gas separator under the target separation efficiency, the method further comprises the following steps:
acquiring the temperature of the engine oil before cooling, and inquiring a piston air leakage correction coefficient corresponding to the temperature of the engine oil before cooling based on the mapping relation between the temperature of the engine oil before cooling and the piston air leakage correction coefficient; or acquiring the temperature of the cooled engine oil and the temperature difference of the cooling liquid before and after the engine oil is cooled, and inquiring the piston air leakage correction coefficient corresponding to the temperature of the cooled engine oil and the temperature difference of the cooling liquid before and after the engine oil is cooled based on the mapping relation between the temperature of the cooled engine oil and the temperature difference of the cooling liquid before and after the engine oil is cooled and the piston air leakage correction coefficient;
calculating to obtain the corrected piston air leakage according to the piston air leakage obtained by query and the piston air leakage correction coefficient obtained by query;
and inquiring the target working temperature corresponding to the corrected piston air leakage amount based on the mapping relation between the piston air leakage amount and the target working temperature of the oil-gas separator under the target separation efficiency.
2. A control method of an oil separator as claimed in claim 1, wherein the separator body (11) is made of metal.
3. A control method of an oil separator as set forth in claim 1, wherein the heat exchanging unit is a heat pump system.
4. A control method of an oil separator as claimed in claim 3, wherein the cross-section of the separation chamber (110) is circular, the gas inlet (111) is a tangential inlet or a helical inlet for rotating the fluid introduced into the separation chamber (110) through the gas inlet (111) within the separation chamber (110) and simultaneously proceeding toward the gas outlet (112);
the heat exchange unit comprises a medium channel (2) which is arranged on the separator body (11) and is not communicated with the separation cavity (110), and the medium channel (2) is used for circulating a refrigerant.
5. A control method of an oil separator as claimed in claim 3, wherein a labyrinth passage is provided on an inner wall of the separation chamber (110), both ends of the labyrinth passage are respectively communicated with the air outlet (112) and the air inlet (111), and the oil return port (113) is communicated with one end of the labyrinth passage;
the heat exchange unit comprises a medium channel (2) which is arranged on a solid structure forming the labyrinth channel and is not communicated with the separation cavity (110), and the medium channel (2) is used for circulating a refrigerant.
6. The control method of the oil separator as claimed in claim 5, wherein a plurality of first baffles (12) are convexly arranged on the inner peripheral wall of the separation cavity (110), and the plurality of first baffles (12) are distributed in a staggered manner to form the labyrinth passage with the inner wall of the separation cavity (110);
or, a coaxial installation base body (14) is fixedly arranged in the separation cavity (110), a plurality of first baffle plates (12) which are distributed along the axial direction and the circumferential direction in an array mode are convexly arranged on the inner wall of the separation cavity (110), a plurality of second baffle plates (13) which are distributed along the axial direction and the circumferential direction in an array mode are convexly arranged on the outer circumferential wall of the installation base body (14), and the first baffle plates (12) and the second baffle plates (13) are distributed in a staggered mode to form the labyrinth channel with the inner wall of the separation cavity (110).
7. A control method of an oil-gas separator as claimed in claim 1, wherein when the temperature of the fluid in the separation chamber (110) is lower than a second preset temperature, the heat exchange unit is controlled to work to raise the temperature of the fluid in the separation chamber (110);
the second preset temperature is less than the first preset temperature.
8. A control method of an oil separator as in claim 1, wherein the acquiring of the piston blow-by amount comprises:
acquiring the actual rotating speed of the engine and the actual output torque of the engine;
and inquiring the piston air leakage corresponding to the actual rotating speed of the engine and the actual output torque of the engine based on the mapping relation between the rotating speed of the engine and the output torque of the engine and the piston air leakage.
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| CN116255225B (en) * | 2023-03-20 | 2024-04-19 | 重庆长安汽车股份有限公司 | Engine assembly, vehicle and method for reducing engine oil dilution |
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