CN114320528B - Electric crankcase ventilation system and control method - Google Patents
Electric crankcase ventilation system and control method Download PDFInfo
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- CN114320528B CN114320528B CN202111541186.8A CN202111541186A CN114320528B CN 114320528 B CN114320528 B CN 114320528B CN 202111541186 A CN202111541186 A CN 202111541186A CN 114320528 B CN114320528 B CN 114320528B
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- 238000009423 ventilation Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012937 correction Methods 0.000 claims description 23
- 239000010705 motor oil Substances 0.000 claims description 20
- 238000012360 testing method Methods 0.000 claims description 7
- 230000005520 electrodynamics Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 24
- 230000000694 effects Effects 0.000 abstract description 18
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
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- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an electric crankcase ventilation system which comprises a vehicle controller, wherein the input end of the vehicle controller is connected with an engine rotating speed sensor, an engine load sensor, an engine temperature sensor, a piston air leakage flow meter, a driving mileage sensor and a memory, and the output end of the vehicle controller is connected with a crankcase centrifuge. The invention also discloses a control method of the electric crankcase ventilation system, when the rotating speed of the engine is greater than zero, the rotating speed and the load of the engine are obtained, the target rotating speed of the centrifugal machine is obtained according to the rotating speed and the load of the engine, and the actual rotating speed of the centrifugal machine of the crankcase is controlled to be equal to the target rotating speed of the centrifugal machine; and when the engine speed is zero, controlling the crankcase centrifuge to continuously run and reducing the target speed of the centrifuge until the engine temperature is equal to the ambient temperature. The invention provides proper rotating speed of the centrifuge according to different working conditions, improves the oil-gas separation effect of the crankcase and reduces the energy consumption of the centrifuge at the same time.
Description
Technical Field
The invention relates to the technical field of vehicle oil-gas separation, in particular to an electric crankcase ventilation system and a control method.
Background
With the development of engine technology, the oil-gas separation effect of an engine crankcase ventilation system is continuously improved, and a Chinese patent CN2019224896781 discloses an oil-gas separation device driven by engine oil pressure. The oil pressure of the engine is controlled in a small constant range, so that the rotating speed range of the oil-gas separation device is limited in a narrow range, and the air leakage of the engine has large difference along with different rotating speeds and loads of the engine, so that the separation effect of the oil-gas separation device cannot be well matched with the air leakage of the engine.
At present, most engines adopt a forced crankcase ventilation system, and a part of oil gas in a crankcase is returned to a cylinder through an intake manifold by using the negative pressure of the intake manifold and is burnt, so that engine oil steam in the crankcase is inevitably consumed, the engine oil consumption is high, and the performance of the engine is influenced by the serious carbon deposition of a valve and a combustion chamber. In addition, a part of oil gas can enter an air filter to cause dust accumulation and even cause the throttle body to be blocked. Therefore, oil gas discharged from the crankcase needs to be effectively filtered, the existing secondary separation device mainly adopts a labyrinth and centrifugal separation mode, most of oil drops can be separated, the efficiency can basically reach 90%, the labyrinth design is too complex, and the manufacturing cost is increased; the rotating speed of the centrifugal device is not controlled, the oil-gas separator is polluted by condensed oil gas after the engine stops working, and the oil-gas separation effect is influenced for a long time; as the running time of the engine increases, the engine is worn to a certain extent, the air leakage of the piston increases along with the increase of the running mileage of the vehicle, and the oil-gas separation effect of the centrifuge should be improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an electric crankcase ventilation system and a control method, the system and the method can provide proper centrifuge rotating speed according to different working conditions, improve the oil-gas separation effect of a crankcase and reduce the energy consumption of the centrifuge at the same time.
In order to achieve the purpose, the invention provides an electric crankcase ventilation system, which comprises a vehicle controller, wherein the input end of the vehicle controller is connected with an engine speed sensor, an engine load sensor and a memory, and the output end of the vehicle controller is connected with a crankcase centrifuge; the storage is used for storing the relation between the engine speed, the engine load and the centrifuge speed, and the vehicle controller is used for determining the target centrifuge speed according to the acquired engine speed and the engine load when the engine runs and controlling the actual speed of the crankcase centrifuge to be equal to the target centrifuge speed.
Further, the input end of the vehicle controller is also connected with an engine temperature sensor, and the vehicle controller is also used for controlling the crankcase centrifuge to work intermittently and reducing the target rotating speed of the centrifuge when the rotating speed of the engine is zero until the temperature of the engine is equal to the ambient temperature.
Furthermore, the vehicle controller is also connected with a mileage sensor, and the vehicle controller is also used for determining a rotating speed correction coefficient according to the mileage and correcting the target rotating speed of the centrifuge through the rotating speed correction coefficient.
Further, the vehicle controller is further connected with a piston air leakage flow meter, and the vehicle controller is used for controlling the engine to operate at different engine speeds and engine loads in an engine bench test stage, adjusting the actual rotating speed of the centrifuge to enable the engine oil consumption rate to be equal to the engine oil consumption rate critical value, calibrating the actual rotating speed of the centrifuge as the target rotating speed of the centrifuge under the engine speed and the engine load, and storing the actual rotating speed of the centrifuge into the storage.
The invention also provides a control method based on the electric crankcase ventilation system, which comprises the following steps: when the engine speed is greater than zero, acquiring the engine speed and the engine load, obtaining the target centrifugal machine speed according to the engine speed and the engine load, and controlling the actual speed of the crankcase centrifugal machine to be equal to the target centrifugal machine speed; and when the engine speed is zero, controlling the crankcase centrifuge to continuously run and reducing the target speed of the centrifuge until the engine temperature is equal to the ambient temperature.
Further, when the engine speed is greater than zero, the crankcase centrifuge is controlled to operate intermittently, and the target speed of the centrifuge is reduced along with the increase of the stop time of the engine.
Furthermore, the driving mileage is also obtained, a rotating speed correction coefficient is determined according to the driving mileage, and the target rotating speed of the centrifugal machine is corrected through the rotating speed correction coefficient.
Further, the rotation speed correction coefficient is greater than or equal to 1, and the rotation speed correction coefficient increases with an increase in the mileage.
Further, the method for determining the target rotating speed of the centrifuge comprises the steps of adjusting the actual rotating speed of the centrifuge to enable the oil consumption rate to be equal to the oil consumption rate critical value under different engine rotating speeds and engine loads in the stage of the engine bench test, and calibrating the actual rotating speed of the centrifuge as the target rotating speed of the centrifuge under the engine rotating speeds and the engine loads.
Further, the method for determining the oil consumption rate comprises the step of obtaining the oil consumption rate according to the piston leakage flow calibration.
The invention has the beneficial effects that: improve the oil-gas separation effect under different working conditions and reduce the energy consumption of the centrifuge. When the engine runs, the target rotating speed of the centrifuge is obtained through calibration of the rotating speed of the engine and the load of the engine, and when the target rotating speed of the centrifuge is calibrated, the optimal separation effect is achieved when the engine oil consumption rate is equal to the engine oil consumption rate critical value; after the engine is stopped, the crankcase centrifuge is controlled to work intermittently and the target rotating speed of the centrifuge is reduced, so that the oil-gas separation effect is ensured and the energy consumption of the centrifuge is reduced. In addition, the influence of the driving mileage on the air leakage of the piston is considered, a rotating speed correction coefficient is determined according to the driving mileage, the target rotation number of the centrifugal machine is corrected, and the oil-gas separation effect is further improved.
Drawings
FIG. 1 is a schematic view of a crankcase ventilation system according to the present invention.
The components in the figures are numbered as follows: the system comprises a vehicle controller 1, a memory 2, an engine speed sensor 3, an engine load sensor 4, an engine temperature sensor 5, a piston air leakage flow meter 6, a mileage sensor 7 and a crankcase centrifuge 8.
Detailed Description
The following detailed description is provided to further explain the claimed embodiments of the present invention in order to make it clear for those skilled in the art to understand the claims. The scope of the invention is not limited to the following specific examples. It is intended that the scope of the invention be determined by those skilled in the art from the following detailed description, which includes claims that are directed to this invention.
As shown in fig. 1, an electric crankcase ventilation system includes a vehicle controller 1, an input end of the vehicle controller is connected with an engine speed sensor 3, an engine load sensor 4, an engine temperature sensor 5, a piston blow-by gas flow meter 6, a mileage sensor 7 and a memory 2, and an output end of the vehicle controller 1 is connected with a crankcase centrifuge 8.
The memory 2 is used for storing the calibration relation among the engine speed, the engine load and the centrifuge speed, the calibration relation among the engine stop time and the centrifuge speed after the engine is stopped, and the calibration relation among the driving mileage and the speed correction coefficient. These storage processes are all completed at the stage of the engine bench test, and the vehicle controller 1 obtains the target rotation speed of the centrifuge by calling the contents stored in the memory in the control process.
The vehicle controller 1 is configured to determine a centrifuge target rotation speed according to the acquired engine rotation speed and engine load when the engine is running, and control the actual rotation speed of the crankcase centrifuge 8 to be equal to the centrifuge target rotation speed. Because the air leakage flow of the piston is different under different engine rotating speeds and engine loads, the rotating speeds of the crankcase centrifuges are different in order to achieve the same oil-gas separation effect, and therefore the proper target rotating speed of the centrifuges is determined according to the engine rotating speeds and the engine loads, and the oil-gas separation effect required by the loads can be achieved under different working conditions.
The vehicle controller 1 is used for controlling the engine to run under different engine speeds and engine loads in an engine bench test stage, adjusting the actual rotating speed of the centrifuge to enable the engine oil consumption rate to be equal to an engine oil consumption rate critical value, calibrating the actual rotating speed of the centrifuge to be the target rotating speed of the centrifuge under the engine speed and the engine load, and storing the target rotating speed of the centrifuge into the memory 2 to finish the calibration process of the target rotating speed of the centrifuge during the running of the engine, wherein the engine oil consumption rate is obtained by calibrating by measuring the piston leakage flow because the engine oil consumption rate is difficult to directly measure, namely the engine oil consumption rate critical value corresponds to the piston leakage flow critical value. The oil consumption rate critical value is set in consideration of meeting the oil-gas separation effect and in consideration of the fact that the oil-gas separation effect is difficult to obviously improve after the rotating speed of the centrifugal machine is continuously increased, so that the oil-gas separation effect is improved and the energy consumption of the centrifugal machine is reduced by calibrating the target rotating speed of the centrifugal machine.
The vehicle controller 1 is further configured to control the crankcase centrifuge 8 to stop operating for 5min every 15s when the engine speed is zero, and determine a centrifuge target speed according to the engine stop time period until the engine temperature is equal to the ambient temperature, wherein the centrifuge target speed decreases as the engine stop time period increases. After the engine stops running, oil gas in the engine crankcase can be slowly cooled and condensed, organic oil and oily sludge particles can be condensed on the oil-gas separator, the oil-gas separation effect is influenced by being attached to the oil-gas separator for a long time, and because the amount of oil gas after the engine stops is less, the crankcase centrifuge adopts intermittent running after the engine stops, the oil-gas separation effect can be ensured, the energy consumption can be reduced, and the reason that the centrifuge intermittently moves until the temperature of the engine is recovered to the ambient temperature is that a small amount of oil-gas condensation phenomenon can exist as long as the temperature difference exists between the temperature of the engine and the ambient temperature.
The vehicle controller 1 is further configured to determine a rotation speed correction coefficient according to the traveled mileage, and correct the target rotation speed of the centrifuge by the rotation speed correction coefficient, where the rotation speed correction coefficient is greater than or equal to 1, and the rotation speed correction coefficient increases with the increase of the traveled mileage, and in this embodiment, a calibration relationship between the traveled mileage and the rotation speed correction coefficient is shown in table 1. The wear degree of the engine is gradually increased along with the increase of the driving mileage, the piston leakage flow is increased along with the increase of the vehicle running mileage, and the target rotating speed of the centrifuge is increased under the same engine rotating speed and engine load so as to improve the oil-gas separation effect.
TABLE 1 calibration relationship between mileage and speed correction factor
The control method of the electric crankcase ventilation system comprises the following steps:
1. in the stage of engine bench test, under different engine speeds and engine loads, the actual rotation speed of the centrifuge is adjusted and the piston leakage flow is measured in real time, when the piston leakage flow is equal to the piston leakage flow critical value, the engine oil consumption rate is equal to the engine oil consumption rate critical value, the actual rotation speed of the centrifuge is calibrated as the target rotation speed of the centrifuge under the engine speed and the engine load, and the calibrated data is stored in the memory 2.
And then, calibrating the target rotating speed of the centrifugal machine and the stop time of the engine, and calibrating the revolution correction coefficient and the driving mileage.
2. And (5) a vehicle normal operation stage. When the engine rotating speed is detected to be greater than zero, the vehicle controller 1 acquires the engine rotating speed and the engine load, and obtains the target rotating speed of the centrifuge according to the engine rotating speed and the engine load; when the engine speed is zero, the crankcase centrifuge 8 is controlled to continue to operate intermittently and the target centrifuge speed is determined according to the engine stop time period until the engine temperature is equal to the ambient temperature.
3. And (3) with the continuous increase of the driving mileage, simultaneously acquiring the driving mileage, determining a rotation speed correction coefficient according to the driving mileage, multiplying the rotation speed correction coefficient by the target rotation speed of the centrifugal machine determined in the step (2) when the engine runs or stops to obtain the corrected target rotation speed of the centrifugal machine, and controlling the actual rotation speed of the crankcase centrifugal machine 8 to be equal to the corrected target rotation speed of the centrifugal machine.
Claims (9)
1. An electrodynamic crankcase ventilation system characterized by: the device comprises a vehicle controller (1), wherein the input end of the vehicle controller is connected with an engine rotating speed sensor (3), an engine load sensor (4) and a memory (2), and the output end of the vehicle controller (1) is connected with a crankcase centrifuge (8); the storage (2) is used for storing the relation between the engine speed, the engine load and the centrifuge speed, and the vehicle controller (1) is used for determining the target centrifuge speed according to the acquired engine speed and the engine load when the engine runs and controlling the actual speed of the crankcase centrifuge (8) to be equal to the target centrifuge speed; the input of vehicle controller (1) still is connected with engine temperature sensor (5), vehicle controller (1) still is used for being zero when engine speed, and control crankcase centrifuge (8) intermittent type nature work and reduce centrifuge target rotational speed until engine temperature equals ambient temperature.
2. The electrically operated crankcase ventilation system of claim 1, wherein: the electrically operated crankcase ventilation system of claim 1, wherein: the vehicle controller (1) is further connected with a mileage sensor (7), and the vehicle controller (1) is further used for determining a rotating speed correction coefficient according to the mileage and correcting the target rotating speed of the centrifugal machine through the rotating speed correction coefficient.
3. The electrically operated crankcase ventilation system of claim 1, wherein: the vehicle controller (1) is further connected with a piston air leakage flow meter (6), the vehicle controller (1) is used for controlling the engine to run under different engine rotating speeds and engine loads in an engine bench test stage, adjusting the actual rotating speed of the centrifuge to enable the engine oil consumption rate to be equal to an engine oil consumption rate critical value, calibrating the actual rotating speed of the centrifuge as the target rotating speed of the centrifuge under the engine rotating speed and the engine load, and storing the target rotating speed of the centrifuge into the storage (2).
4. A method of controlling an electric crankcase ventilation system according to any of claims 1-3, characterized in that: when the engine speed is greater than zero, acquiring the engine speed and the engine load, obtaining the target centrifugal speed according to the engine speed and the engine load, and controlling the actual rotating speed of the crankcase centrifugal machine (8) to be equal to the target centrifugal speed; when the engine speed is zero, controlling the crankcase centrifuge (8) to continue running and reducing the target speed of the centrifuge until the engine temperature is equal to the ambient temperature.
5. The method of controlling an electric crankcase ventilation system according to claim 4, wherein: when the engine speed is greater than zero, the crankcase centrifuge (8) is controlled to operate intermittently, and the target speed of the centrifuge is reduced along with the increase of the stop time of the engine.
6. The method of claim 4, wherein the step of controlling the electric crankcase ventilation system further comprises: and acquiring the driving mileage, determining a rotation speed correction coefficient according to the driving mileage, and correcting the target rotation speed of the centrifugal machine through the rotation speed correction coefficient.
7. The method of controlling an electric crankcase ventilation system according to claim 6, wherein: the rotation speed correction coefficient is greater than or equal to 1, and the rotation speed correction coefficient increases with an increase in the mileage.
8. The method of controlling an electric crankcase ventilation system according to claim 4, wherein: the method for determining the target rotating speed of the centrifugal machine comprises the steps of adjusting the actual rotating speed of the centrifugal machine to enable the engine oil consumption rate to be equal to the engine oil consumption rate critical value under different engine rotating speeds and engine loads in the stage of engine bench test, and calibrating the actual rotating speed of the centrifugal machine to be the target rotating speed of the centrifugal machine under the engine rotating speeds and the engine loads.
9. The method of controlling an electric crankcase ventilation system according to claim 8, wherein: the determination method of the engine oil consumption rate comprises the step of obtaining the engine oil consumption rate according to the piston leakage flow calibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111541186.8A CN114320528B (en) | 2021-12-16 | 2021-12-16 | Electric crankcase ventilation system and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111541186.8A CN114320528B (en) | 2021-12-16 | 2021-12-16 | Electric crankcase ventilation system and control method |
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| Publication Number | Publication Date |
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| CN114320528A CN114320528A (en) | 2022-04-12 |
| CN114320528B true CN114320528B (en) | 2023-02-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1479890A2 (en) * | 2003-05-19 | 2004-11-24 | HONDA MOTOR CO., Ltd. | Exhaust control system and vehicle provided with it |
| 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 |
| CN201071754Y (en) * | 2007-08-31 | 2008-06-11 | 俞善明 | Energy-saving engine |
| JP2013130161A (en) * | 2011-12-22 | 2013-07-04 | Mazda Motor Corp | Crankpin oiling structure of engine and oiling device of engine |
| WO2019072914A1 (en) * | 2017-10-10 | 2019-04-18 | Alfdex Ab | Internal combustion engine and method of cleaning crankcase gas |
| CN113389617A (en) * | 2021-07-30 | 2021-09-14 | 广西玉柴机器股份有限公司 | Control method for crankcase pressure of electric drive oil-gas separator |
-
2021
- 2021-12-16 CN CN202111541186.8A patent/CN114320528B/en active Active
Patent Citations (6)
| 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 |
| EP1479890A2 (en) * | 2003-05-19 | 2004-11-24 | HONDA MOTOR CO., Ltd. | Exhaust control system and vehicle provided with it |
| CN201071754Y (en) * | 2007-08-31 | 2008-06-11 | 俞善明 | Energy-saving engine |
| JP2013130161A (en) * | 2011-12-22 | 2013-07-04 | Mazda Motor Corp | Crankpin oiling structure of engine and oiling device of engine |
| WO2019072914A1 (en) * | 2017-10-10 | 2019-04-18 | Alfdex Ab | Internal combustion engine and method of cleaning crankcase gas |
| CN113389617A (en) * | 2021-07-30 | 2021-09-14 | 广西玉柴机器股份有限公司 | Control method for crankcase pressure of electric drive oil-gas separator |
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| CN114320528A (en) | 2022-04-12 |
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