CN112282892A - Control method, device and system for positive ventilation of crankcase - Google Patents
Control method, device and system for positive ventilation of crankcase Download PDFInfo
- Publication number
- CN112282892A CN112282892A CN202011062517.5A CN202011062517A CN112282892A CN 112282892 A CN112282892 A CN 112282892A CN 202011062517 A CN202011062517 A CN 202011062517A CN 112282892 A CN112282892 A CN 112282892A
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- crankcase
- humidity value
- outlet
- current
- throttle valve
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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
-
- 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
- F01M13/0011—Breather valves
Abstract
The invention belongs to the technical field of vehicles, and particularly relates to a method, a device and a system for controlling forced ventilation of a crankcase. The control method for the positive crankcase ventilation comprises the following steps: acquiring a current humidity value of an outlet of an oil-gas separator connected with an air outlet of a crankcase; and controlling the opening of a throttle valve communicated with the air inlet of the crankcase according to the comparison between the current humidity value of the outlet of the oil-gas separator and the target humidity value. In the control method for the forced ventilation of the crankcase, the opening degree of the throttle valve communicated with the air inlet of the crankcase is controlled, the ventilation quantity in the crankcase is controlled by adjusting the opening degree of the throttle valve, the ventilation quantity of the crankcase is prevented from being too large or too small, the service life of an engine can be prolonged, and faults can be avoided.
Description
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to a method, a device and a system for controlling forced ventilation of a crankcase.
Background
The ventilation quantity of the existing engine crankcase forced ventilation system can not be controlled, and the ventilation quantity is too large or too small. When the ventilation volume of the engine crankcase forced ventilation system is overlarge, the separation efficiency of the oil-gas separator is reduced, and the service life of the engine is shortened. When the ventilation volume of the forced ventilation system of the engine crankcase is too small, the moisture of the gas in the crankcase cannot be diluted, and the faults of engine oil emulsification and icing of the oil-gas separator cannot be solved.
In summary, the ventilation rate of the conventional positive crankcase ventilation system of the engine cannot be controlled, and the ventilation rate is too large or too small.
Disclosure of Invention
The invention aims to at least solve the problems that the ventilation quantity of the existing positive ventilation system of the engine crankcase cannot be controlled and is too large or too small. The purpose is realized by the following technical scheme:
the invention provides a method for controlling forced ventilation of a crankcase, which comprises the following steps:
acquiring a current humidity value of an outlet of an oil-gas separator connected with an air outlet of a crankcase;
and controlling the opening of a throttle valve communicated with the air inlet of the crankcase according to the comparison between the current humidity value of the outlet of the oil-gas separator and the target humidity value.
According to the control method of the forced ventilation of the crankcase, the opening degree of the throttle valve communicated with the air inlet of the crankcase is controlled according to the comparison between the current humidity value of the outlet of the oil-gas separator and the target humidity value, the ventilation quantity in the crankcase is controlled by adjusting the opening degree of the throttle valve, the ventilation quantity of the crankcase is prevented from being too large or too small, the service life of an engine can be prolonged, and faults can be avoided.
In addition, the control method for positive crankcase ventilation according to the invention may also have the following additional technical features:
in some embodiments of the invention, the controlling the throttle opening communicated with the crankcase air inlet according to the comparison of the current humidity value of the oil-gas separator outlet and the target humidity value comprises:
controlling the opening of a throttle valve communicated with the air inlet of the crankcase to be increased according to the fact that the current humidity value of the outlet of the oil-gas separator is larger than the target humidity value; and controlling the opening of a throttle valve communicated with the air inlet of the crankcase to be reduced according to the condition that the current humidity value of the outlet of the oil-gas separator is smaller than the target humidity value.
In some embodiments of the present invention, the comparing according to the current humidity value of the outlet of the oil separator with the target humidity value comprises:
acquiring the current air inlet temperature of the engine and the current pressure value after the supercharger;
and obtaining a target humidity value according to the current air inlet temperature of the engine and the current pressure value lookup table after the supercharger.
In some embodiments of the invention, the controlling the throttle opening in communication with the crankcase intake comprises:
controlling a throttle valve in communication with the crankcase intake port to adjust from an initial opening.
In some embodiments of the invention, controlling the adjustment of the throttle valve in communication with the crankcase intake from an initial opening comprises:
acquiring the current rotating speed of the engine and the current power of the engine;
and obtaining a supercharging pressure value after supercharging of a supercharger according to the current rotating speed of the engine and the current power of the engine, and controlling the throttle valve to be opened to an initial opening degree according to the supercharging pressure value after supercharging of the supercharger.
In another aspect of the present invention, a control device for positive crankcase ventilation is provided, which is configured to execute the above control method for positive crankcase ventilation, wherein the control device includes: an acquisition unit and a throttle valve control unit, wherein:
the acquisition unit is used for acquiring the current humidity value of an outlet of the oil-gas separator connected with an air outlet of the crankcase;
the throttle valve control unit is used for controlling the opening of a throttle valve communicated with the air inlet of the crankcase according to the comparison between the current humidity value of the outlet of the oil-gas separator and a target humidity value.
The invention also provides a control system for positive crankcase ventilation, which comprises a memory and the control device for positive crankcase ventilation, wherein the memory stores instructions of the control method for positive crankcase ventilation;
the control system for positive crankcase ventilation further comprises: the outlet of the engine air inlet pipe is communicated with the cylinder;
the air inlet of the crankcase is communicated with the engine air inlet pipe through a bypass pipe, and a throttle valve is arranged on the bypass pipe;
the gas outlet of the crankcase is communicated with the engine gas inlet pipe through a pipeline, and the gas-oil separator is arranged on the pipeline;
and the humidity sensor is arranged on the pipeline and is positioned at the outlet of the oil-gas separator.
In some embodiments of the invention, the control system for positive crankcase ventilation further comprises:
the supercharger is arranged on the engine air inlet pipe and is positioned between the bypass pipe and the pipeline;
an intake air temperature sensor provided at an inlet of the engine intake pipe;
a boost pressure sensor disposed at an outlet of the supercharger.
In some embodiments of the invention, the intake air temperature sensor is located between the duct and the supercharger.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically illustrates a flow chart of a method of controlling positive crankcase ventilation according to an embodiment of the invention;
fig. 2 schematically shows a schematic structural view of a control system for positive crankcase ventilation according to an embodiment of the invention.
1: an engine intake duct; 2: an intake air temperature sensor; 3: a supercharger; 4: a boost pressure sensor; 5: a bypass pipe; 6: a throttle valve; 7: a crankcase; 8: a cylinder; 9: a pipeline; 10: an oil-gas separator; 11: a humidity sensor.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 and 2, the method for controlling the positive ventilation of the crankcase 7 in the present embodiment includes the following steps:
s1, acquiring the current humidity value of the outlet of the oil-gas separator 10 connected with the air outlet of the crankcase 7;
and S2, controlling the opening degree of the throttle valve 6 communicated with the air inlet of the crankcase 7 according to the comparison between the current humidity value of the outlet of the oil-gas separator 10 and the target humidity value.
Specifically, by adjusting the opening degree of the throttle valve 6, the amount of ventilation in the crankcase 7 is controlled, the amount of ventilation in the crankcase 7 is prevented from being excessively large or small, the service life of the engine can be increased, and malfunctions can be avoided.
In some embodiments of the present invention, the controlling the opening of the throttle valve 6 communicating with the intake port of the crankcase 7 according to the comparison of the current humidity value at the outlet of the gas-oil separator 10 with the target humidity value comprises:
controlling the opening of a throttle valve 6 communicated with an air inlet of the crankcase 7 to increase according to the fact that the current humidity value of the outlet of the oil-gas separator 10 is larger than the target humidity value; and controlling the opening degree of a throttle valve 6 communicated with an air inlet of the crankcase 7 to be reduced according to the condition that the current humidity value of the outlet of the oil-gas separator 10 is smaller than the target humidity value.
Specifically, when the current humidity value is large, the opening degree of the throttle valve 6 needs to be increased, the current humidity value is reduced, when the current humidity value is small, the opening degree of the throttle valve 6 needs to be reduced, the current humidity value is increased, and when the current humidity value is consistent with the target humidity value, the opening degree of the throttle valve 6 is maintained.
In some embodiments of the present invention, the comparing of the current humidity value with the target humidity value according to the outlet of the oil separator 10 comprises:
acquiring the current air inlet temperature of the engine and the current pressure value after the supercharger 3;
and obtaining a target humidity value according to the current air inlet temperature of the engine and the current pressure value lookup table after the supercharger 3.
In some embodiments of the invention, said controlling the opening of the throttle valve 6 in communication with the inlet of the crankcase 7 comprises:
the throttle valve 6 communicating with the intake port of the crankcase 7 is controlled to be adjusted from an initial opening.
In some embodiments of the invention, said controlling the adjustment of the throttle valve 6 in communication with the inlet of the crankcase 7 from an initial opening degree comprises:
acquiring the current rotating speed of the engine and the current power of the engine;
and obtaining a supercharging pressure value after the supercharger 3 is supercharged according to the current rotating speed of the engine and the current power of the engine, and controlling the throttle valve 6 to be opened to the initial opening degree according to the supercharging pressure value after the supercharger 3 is supercharged.
In another aspect of the present invention, a device for controlling forced ventilation of a crankcase 7 is further provided, where the device for controlling forced ventilation of a crankcase 7 is used for executing the method for controlling forced ventilation of a crankcase 7, and the device includes: a fetch unit and a throttle valve 6 control unit, wherein:
the acquiring unit is used for acquiring the current humidity value of the outlet of the oil-gas separator 10 connected with the air outlet of the crankcase 7;
the throttle valve 6 control unit is used for controlling the opening of the throttle valve 6 communicated with the air inlet of the crankcase 7 according to the comparison between the current humidity value at the outlet of the oil-gas separator 10 and the target humidity value.
In another aspect of the present invention, a control system for forced ventilation of a crankcase 7 is further provided, the control system for forced ventilation of a crankcase 7 includes a memory and a control device for forced ventilation of the crankcase 7, and the memory stores instructions of the control method for forced ventilation of the crankcase 7;
the control system for positive ventilation of the crankcase 7 further comprises: an engine air inlet pipe 1, wherein an outlet of the engine air inlet pipe 1 is communicated with a cylinder 8;
a crankcase 7, an air inlet of the crankcase 7 is communicated with the engine air inlet pipe 1 through a bypass pipe 5, and a throttle valve 6 is arranged on the bypass pipe 5;
the gas outlet of the crankcase 7 is communicated with the engine gas inlet pipe 1 through a pipeline 9, and the gas-oil separator 10 is arranged on the pipeline 9;
and the humidity sensor 11 is arranged on the pipeline 9 and is positioned at the outlet of the oil-gas separator 10.
In some embodiments of the invention, the control system of the positive ventilation of the crankcase 7 further comprises:
a supercharger 3, wherein the supercharger 3 is arranged on the engine air inlet pipe 1 and is positioned between the bypass pipe 5 and the pipeline 9;
an intake air temperature sensor 2, the intake air temperature sensor 2 being provided at an inlet of the engine intake pipe 1;
a boost pressure sensor 4, the boost pressure sensor 4 being provided at an outlet of the supercharger 3.
The exhaust pipe of the supercharger 3 also communicates with the cylinder 8.
In some embodiments of the invention, the intake air temperature sensor 2 is located between the duct 9 and the supercharger 3.
In the control method for the forced ventilation of the crankcase 7, the specific logic is as follows: step 1: and the ECU reads the air inlet temperature measured by the air inlet temperature pressure sensor and the current pressure value measured by the supercharging pressure sensor 4, and obtains a target humidity value according to an experimental table.
Step 2: the ECU reads a current humidity value measured by a humidity sensor 11 of the oil-gas separator 10, and adjusts the opening of the throttle valve according to the comparison between the current humidity value and a target humidity value, so that the current humidity value approaches the target humidity value.
And step 3: the ECU executes the opening of the throttle valve 6 of step 2 and corrects the current humidity value measured by the humidity sensor 11 and the target humidity value to form a closed loop, and if there is a difference, proceeds to step 1.
In summary, in the method for controlling forced ventilation of the crankcase 7 according to the present invention, the opening degree of the throttle valve 6 communicating with the air inlet of the crankcase 7 is controlled according to the comparison between the current humidity value at the outlet of the gas-oil separator 10 and the target humidity value, and the ventilation amount in the crankcase 7 is controlled by adjusting the opening degree of the throttle valve 6, so as to prevent the ventilation amount in the crankcase 7 from being too large or too small, thereby increasing the service life of the engine and avoiding faults.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for controlling forced ventilation of a crankcase, the method comprising the steps of:
acquiring a current humidity value of an outlet of an oil-gas separator connected with an air outlet of a crankcase;
and controlling the opening of a throttle valve communicated with the air inlet of the crankcase according to the comparison between the current humidity value of the outlet of the oil-gas separator and the target humidity value.
2. The control method of positive crankcase ventilation according to claim 1, wherein the controlling the throttle opening communicated with the crankcase air intake according to the comparison of the current humidity value of the air-oil separator outlet with the target humidity value comprises:
controlling the opening of a throttle valve communicated with the air inlet of the crankcase to be increased according to the fact that the current humidity value of the outlet of the oil-gas separator is larger than the target humidity value; and controlling the opening of a throttle valve communicated with the air inlet of the crankcase to be reduced according to the condition that the current humidity value of the outlet of the oil-gas separator is smaller than the target humidity value.
3. The method of claim 2, wherein the comparing the current humidity value of the outlet of the gas-oil separator with the target humidity value comprises:
acquiring the current air inlet temperature of the engine and the current pressure value after the supercharger;
and obtaining a target humidity value according to the current air inlet temperature of the engine and the current pressure value lookup table after the supercharger.
4. The method of claim 1, wherein the controlling the throttle opening in communication with the crankcase air intake comprises:
controlling a throttle valve in communication with the crankcase intake port to adjust from an initial opening.
5. The method of claim 4, wherein controlling the throttle valve in communication with the crankcase air intake to adjust from an initial opening comprises:
acquiring the current rotating speed of the engine and the current power of the engine;
and obtaining a supercharging pressure value after supercharging of a supercharger according to the current rotating speed of the engine and the current power of the engine, and controlling the throttle valve to be opened to an initial opening degree according to the supercharging pressure value after supercharging of the supercharger.
6. A control device of positive crankcase ventilation for performing the control method of positive crankcase ventilation according to claim 1, comprising: an acquisition unit and a throttle valve control unit, wherein:
the acquisition unit is used for acquiring the current humidity value of an outlet of the oil-gas separator connected with an air outlet of the crankcase;
the throttle valve control unit is used for controlling the opening of a throttle valve communicated with the air inlet of the crankcase according to the comparison between the current humidity value of the outlet of the oil-gas separator and a target humidity value.
7. A control system for positive crankcase ventilation comprising a memory and a control device for positive crankcase ventilation according to claim 6, wherein the memory stores instructions of a control method for positive crankcase ventilation according to any one of claims 1 to 5;
the control system for positive crankcase ventilation further comprises: the outlet of the engine air inlet pipe is communicated with the cylinder;
the air inlet of the crankcase is communicated with the engine air inlet pipe through a bypass pipe, and a throttle valve is arranged on the bypass pipe;
the gas outlet of the crankcase is communicated with the engine gas inlet pipe through a pipeline, and the gas-oil separator is arranged on the pipeline;
and the humidity sensor is arranged on the pipeline and is positioned at the outlet of the oil-gas separator.
8. The control system of positive crankcase ventilation according to claim 7, further comprising:
the supercharger is arranged on the engine air inlet pipe and is positioned between the bypass pipe and the pipeline;
an intake air temperature sensor provided at an inlet of the engine intake pipe;
a boost pressure sensor disposed at an outlet of the supercharger.
9. The control system of positive crankcase ventilation according to claim 8, wherein the intake air temperature sensor is located between the duct and the supercharger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011062517.5A CN112282892A (en) | 2020-09-30 | 2020-09-30 | Control method, device and system for positive ventilation of crankcase |
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| CN202011062517.5A CN112282892A (en) | 2020-09-30 | 2020-09-30 | Control method, device and system for positive ventilation of crankcase |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879121A (en) * | 2021-02-01 | 2021-06-01 | 浙江吉利控股集团有限公司 | Control method and control system of crankcase ventilation system |
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