CN113389617A - Control method for crankcase pressure of electric drive oil-gas separator - Google Patents
Control method for crankcase pressure of electric drive oil-gas separator Download PDFInfo
- Publication number
- CN113389617A CN113389617A CN202110868794.3A CN202110868794A CN113389617A CN 113389617 A CN113389617 A CN 113389617A CN 202110868794 A CN202110868794 A CN 202110868794A CN 113389617 A CN113389617 A CN 113389617A
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- Prior art keywords
- pressure
- crankcase
- target
- engine
- rotating speed
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000012937 correction Methods 0.000 claims description 19
- 238000001228 spectrum Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 230000005465 channeling Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 10
- 239000003921 oil Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Images
Classifications
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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
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
-
- 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
- F01M2013/0077—Engine parameters used for crankcase breather systems
- F01M2013/0083—Crankcase pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method for controlling the pressure of a crankcase of an electric drive oil-gas separator, which relates to the technical field of crankcases and solves the technical problem of high energy consumption of crankcase pressure control, and the method comprises the following steps: and after the target pressure is corrected according to the actual air inlet pressure of the engine, the target rotating speed is calculated by combining the current crankcase pressure, and the operation of the electric oil-gas displacement separator is controlled according to the target rotating speed. The invention predicts the pressure of the crankcase by taking the air inlet pressure of the engine as the load reference of the engine, thereby controlling the pressure of the crankcase in advance, greatly reducing the hysteresis of the existing PID closed loop, improving the stability of the pressure of the crankcase, setting a larger pressure target of the crankcase to reduce the rotating speed of the electric oil-gas displacement separator, reducing the energy consumption of the engine and effectively reducing the risk of oil channeling.
Description
Technical Field
The invention relates to the technical field of crank cases, in particular to a method for controlling the pressure of a crank case of an electric oil displacement gas separator.
Background
Regarding the crankcase pressure of natural gas engine, it is required in the regulations of the limit of emission of pollutants for heavy diesel vehicles and the measurement method (sixth stage of china) that the pressure of the crankcase should not be greater than atmospheric pressure. The use of the electric oil-gas separator can control the pressure of the crankcase within a pressure range which meets the requirements of regulations and has the smallest fluctuation.
The existing electric oil-gas separator controls the pressure of a crankcase by a simple pressure closed loop, namely, a crankcase pressure target is set, and after the actual pressure exceeds the target value, the pressure of the crankcase is maintained in a certain range by a PID closed loop.
The disadvantages of the current solution: because crankcase pressure is relevant and changeable with engine load, it has certain hysteresis quality to carry out the closed loop again after actually measuring pressure variation, can cause actual crankcase pressure to fluctuate at great scope, for guaranteeing that crankcase pressure is not more than atmospheric pressure, eliminates undulant influence, often can set up the target pressure lower, causes more energy consumptions, and probably causes the risk of scurrying the machine oil because of crankcase pressure is low excessively.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and aims to provide a method for controlling the pressure of a crankcase of an electric drive oil-gas separator, which can reduce energy consumption.
The technical scheme of the invention is as follows: a control method for crankcase pressure of an electric drive oil-gas separator is characterized in that after target pressure is corrected according to actual intake pressure of an engine, a target rotating speed is calculated by combining current crankcase pressure, and the electric drive oil-gas separator is controlled to operate according to the target rotating speed.
As a further improvement, the correcting the target pressure specifically includes:
calibrating a pulse spectrum of a curve pressure correction factor in advance according to the rotating speed of the engine and the air inlet pressure of the engine;
inquiring the curve pressure correction factor pulse spectrum according to the actual intake pressure to obtain a corresponding correction factor;
and calculating to obtain the correction pressure according to the correction factor and the target pressure.
And further, carrying out PID closed-loop control according to the correction pressure, the current crankcase pressure and the current rotating speed of the electric drive oil-gas separator to obtain the target rotating speed.
Further, the actual intake pressure and the current crankcase pressure are subjected to mean value filtering processing.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
the invention predicts the pressure of the crankcase by taking the air inlet pressure of the engine as the load reference of the engine, thereby controlling the pressure of the crankcase in advance, greatly reducing the hysteresis of the existing PID closed loop, improving the stability of the pressure of the crankcase, setting a larger pressure target of the crankcase to reduce the rotating speed of the electric oil-gas displacement separator, reducing the energy consumption of the engine and effectively reducing the risk of oil channeling.
Drawings
FIG. 1 is a control flow chart of the present invention.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 1, after a target pressure is corrected according to an actual intake pressure of an engine, a target rotation speed is calculated by combining a current crankcase pressure, and the operation of the electric drive oil separator is controlled according to the target rotation speed.
In this embodiment, the step of correcting the target pressure is specifically as follows:
calibrating a pulse spectrum of a curve pressure correction factor in advance according to the rotating speed of the engine and the air inlet pressure of the engine;
inquiring a curve pressure correction factor pulse spectrum according to the actual air inlet pressure to obtain a corresponding correction factor;
and calculating the correction pressure according to the correction factor and the target pressure, namely, the correction pressure is equal to the correction factor multiplied by the target pressure.
In the embodiment, PID closed-loop control is performed according to the correction pressure, the current crankcase pressure and the current rotating speed of the electric drive oil separator to obtain the target rotating speed.
And mean value filtering processing is carried out on the actual air inlet pressure and the current crankcase pressure, so that the phenomenon that the pressure fluctuation of the control crankcase is overlarge due to target rotating speed mutation caused by mutation of the detection values of the actual air inlet pressure and the current crankcase pressure or noise is prevented.
In a natural gas engine, the intake pressure can represent the engine load, i.e. the higher the intake pressure, the greater the load, and the greater the crankcase pressure. The invention predicts the pressure of the crankcase by taking the air inlet pressure of the engine as the load reference of the engine, thereby controlling the pressure of the crankcase in advance, greatly reducing the hysteresis of the existing PID closed loop, improving the stability of the pressure of the crankcase, setting a larger pressure target of the crankcase to reduce the rotating speed of the electric oil-gas displacement separator, reducing the energy consumption of the engine and effectively reducing the risk of oil channeling.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (4)
1. The method for controlling the pressure of the crankcase of the electric drive oil-gas separator is characterized in that after the target pressure is corrected according to the actual air inlet pressure of an engine, the target rotating speed is calculated by combining the current pressure of the crankcase, and the electric drive oil-gas separator is controlled to operate according to the target rotating speed.
2. The method for controlling the crankcase pressure of the electric drive oil-gas separator according to claim 1, wherein the correcting the target pressure specifically comprises:
calibrating a pulse spectrum of a curve pressure correction factor in advance according to the rotating speed of the engine and the air inlet pressure of the engine;
inquiring the curve pressure correction factor pulse spectrum according to the actual intake pressure to obtain a corresponding correction factor;
and calculating to obtain the correction pressure according to the correction factor and the target pressure.
3. The method for controlling the crankcase pressure of the electric drive oil-gas separator according to claim 2, wherein the target rotating speed is obtained by performing PID closed-loop control according to the corrected pressure, the current crankcase pressure and the current rotating speed of the electric drive oil-gas separator.
4. The method of claim 1, wherein the actual intake pressure and the current crankcase pressure are subjected to mean filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110868794.3A CN113389617A (en) | 2021-07-30 | 2021-07-30 | Control method for crankcase pressure of electric drive oil-gas separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110868794.3A CN113389617A (en) | 2021-07-30 | 2021-07-30 | Control method for crankcase pressure of electric drive oil-gas separator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113389617A true CN113389617A (en) | 2021-09-14 |
Family
ID=77622255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110868794.3A Pending CN113389617A (en) | 2021-07-30 | 2021-07-30 | Control method for crankcase pressure of electric drive oil-gas separator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113389617A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320528A (en) * | 2021-12-16 | 2022-04-12 | 东风汽车集团股份有限公司 | Electric crankcase ventilation system and control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1662730A (en) * | 2002-06-20 | 2005-08-31 | 阿尔法拉瓦尔股份有限公司 | Method and a device for cleaning of crankcase gas |
| CN104863666A (en) * | 2014-07-10 | 2015-08-26 | 北汽福田汽车股份有限公司 | Oil and gas separation channel structure of crank case as well as crank case assembly comprising structure |
| CN107191304A (en) * | 2017-07-27 | 2017-09-22 | 潍柴动力股份有限公司 | Gas and oil separating plant and its control method |
| US20200109676A1 (en) * | 2017-02-28 | 2020-04-09 | Mtu Friedrichshafen Gmbh | Method for monitoring crankcase pressure |
| CN112627936A (en) * | 2020-12-07 | 2021-04-09 | 潍柴动力股份有限公司 | Oil-gas separation system, control method of oil-gas separation system and vehicle |
-
2021
- 2021-07-30 CN CN202110868794.3A patent/CN113389617A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1662730A (en) * | 2002-06-20 | 2005-08-31 | 阿尔法拉瓦尔股份有限公司 | Method and a device for cleaning of crankcase gas |
| CN104863666A (en) * | 2014-07-10 | 2015-08-26 | 北汽福田汽车股份有限公司 | Oil and gas separation channel structure of crank case as well as crank case assembly comprising structure |
| US20200109676A1 (en) * | 2017-02-28 | 2020-04-09 | Mtu Friedrichshafen Gmbh | Method for monitoring crankcase pressure |
| CN107191304A (en) * | 2017-07-27 | 2017-09-22 | 潍柴动力股份有限公司 | Gas and oil separating plant and its control method |
| CN112627936A (en) * | 2020-12-07 | 2021-04-09 | 潍柴动力股份有限公司 | Oil-gas separation system, control method of oil-gas separation system and vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320528A (en) * | 2021-12-16 | 2022-04-12 | 东风汽车集团股份有限公司 | Electric crankcase ventilation system and control method |
| CN114320528B (en) * | 2021-12-16 | 2023-02-28 | 东风汽车集团股份有限公司 | Electric crankcase ventilation system and control method |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210914 |
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