CN114645747A - Engine oil pump control method and system and vehicle - Google Patents
Engine oil pump control method and system and vehicle Download PDFInfo
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- CN114645747A CN114645747A CN202110480310.8A CN202110480310A CN114645747A CN 114645747 A CN114645747 A CN 114645747A CN 202110480310 A CN202110480310 A CN 202110480310A CN 114645747 A CN114645747 A CN 114645747A
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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
- F01M1/00—Pressure lubrication
- F01M1/16—Controlling lubricant pressure or quantity
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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
- F01M1/00—Pressure lubrication
- F01M1/02—Pressure lubrication using lubricating pumps
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The invention provides a control method and a control system for an engine oil pump and a vehicle, wherein the engine oil pump is a variable displacement oil pump, and the control method comprises the steps of obtaining the dilution rate and the temperature of engine oil in an engine; and when the dilution rate is not lower than a preset dilution rate threshold and the engine oil temperature is not lower than a preset temperature threshold, enabling the engine oil pump to work in a large displacement mode. The engine oil pump control method can increase the stirring of the engine oil by utilizing the large discharge capacity of the engine oil pump when the engine oil dilution rate exceeds the preset threshold and the engine oil temperature reaches the preset threshold, and can accelerate the evaporation speed of the fuel oil in the oil pan, thereby effectively reducing the engine oil dilution rate.
Description
Technical Field
The invention relates to the technical field of vehicle engine lubrication, in particular to an engine oil pump control method, and also relates to an engine oil pump control system and a vehicle with the engine oil pump control system.
Background
In an engine lubricating system, engine oil dilution refers to the phenomenon that when an engine cold machine which is directly injected in a cylinder runs in a low-temperature environment, due to the fact that the temperature of a cylinder wall is low, fuel oil is poorly sprayed and atomized to generate wet walls, and during a compression stroke, fuel oil attached to the cylinder wall enters a crankcase along a piston oil return hole and finally flows into an oil pan to be mixed with the engine oil. When the dilution rate of the engine oil is larger than a certain value, the lubrication effect of the engine oil of the engine is poor, and even the problem of the bearing-pulling of the engine is caused.
At present, fuel mixed into engine oil generally enters an engine along with a crankcase ventilation system to be continuously combusted after being volatilized from an oil pan, so that the dilution rate of the engine oil is reduced. However, the fuel volatilization effect in the existing vehicle engine is difficult to meet the requirement well, so that the engine oil still has the risk of high dilution rate.
Disclosure of Invention
In view of the above, the present invention is directed to a method for controlling an engine oil pump, so as to effectively reduce an oil dilution rate.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an engine oil pump control method, the oil pump is a variable displacement oil pump, and the control method comprises:
obtaining the dilution rate and the temperature of engine oil in an engine; and the number of the first and second groups,
and when the dilution rate is not lower than a preset dilution rate threshold and the engine oil temperature is not lower than a preset temperature threshold, enabling the engine oil pump to work in a large-displacement mode.
Further, the dilution rate of the engine oil is obtained by collecting the liquid level of the engine oil in the engine.
Further, the engine oil temperature is obtained by collecting the temperature of cooling water in the engine.
Further, the control method further includes:
when the dilution rate is lower than the preset dilution rate threshold value, obtaining the engine speed and the engine torque;
if the engine rotating speed is not lower than a preset rotating speed threshold value and the engine torque is not lower than a preset torque threshold value, enabling the oil pump to work in a large displacement mode;
otherwise, the oil pump is operated in a small displacement mode.
Further, the engine oil pump is enabled to work in a small displacement mode within a preset time threshold after the engine is stopped.
Compared with the prior art, the invention has the following advantages:
the engine oil pump control method can utilize the oil pump to work in a large-displacement mode when the dilution rate of engine oil exceeds a preset threshold and the temperature of the engine oil reaches the preset threshold, so that the stirring of the engine oil is increased, the evaporation speed of fuel oil in an oil pan can be accelerated, and the dilution rate of the engine oil can be effectively reduced.
Another objective of the present invention is to provide an engine oil pump control system, wherein the oil pump is a variable displacement oil pump, and the control system includes an acquisition unit and a control unit connected to the acquisition unit, wherein:
the acquisition unit is provided with a dilution rate acquisition module and a temperature acquisition module;
the dilution rate acquisition module is used for acquiring the dilution rate of engine oil in the engine, and the temperature acquisition module is used for acquiring the temperature of the engine oil;
the control unit is used for comparing the dilution rate with a preset dilution rate threshold value and comparing the engine oil temperature with a preset temperature threshold value;
and when the dilution rate is not lower than the preset dilution rate threshold and the engine oil temperature is not lower than the preset temperature threshold, the control unit controls the engine oil pump to work in a large displacement mode.
Further, the dilution rate acquisition module comprises an engine oil liquid level sensor for detecting the liquid level of engine oil in the engine, and the control unit acquires the dilution rate according to the liquid level of the engine oil;
the temperature acquisition module comprises a temperature sensor for detecting the temperature of cooling water in the engine, and the control unit acquires the temperature of the engine oil through the temperature of the cooling water.
Further, the acquisition unit is provided with a rotating speed acquisition module and a torque acquisition module; the rotating speed acquisition module is used for acquiring the rotating speed of the engine, and the torque acquisition module is used for acquiring the torque of the engine;
when the dilution rate is lower than the preset dilution rate threshold value, the control unit compares the engine rotating speed with a preset rotating speed threshold value and compares the engine torque with a preset torque threshold value;
and when the engine speed is not lower than the preset speed threshold and the engine torque is not lower than the preset torque threshold, the control unit controls the engine oil pump to work in a large displacement mode.
Further, the control unit employs an engine ECU.
In addition, the invention further provides a vehicle, and the engine oil pump control system is arranged on the vehicle.
According to the engine oil pump control system and the vehicle with the same, the oil pump is controlled to work in a large displacement mode, so that the evaporation speed of fuel oil in the oil pan can be accelerated, the engine oil dilution rate can be effectively reduced, and the engine oil pump control system and the vehicle with the same have good practicability.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an engine oil pump control system according to a first embodiment of the present invention;
FIG. 2 is a flowchart of an engine oil pump control method according to a first embodiment of the present invention.
Description of reference numerals:
100. a control unit; 200. a collection unit; 300. an oil pump;
201. a dilution rate acquisition module; 202. a temperature acquisition module; 203. a rotating speed acquisition module; 204. and a torque acquisition module.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inside", "outside", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.
In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
The embodiment relates to an engine oil pump control system, in which the oil pump 300 is specifically a variable displacement oil pump, and specifically can be a two-stage variable displacement oil pump with large and small displacement modes and adjustable displacement in two stages.
The large displacement mode is that the oil pump 300 operates in a set large displacement mode, at this time, the displacement of the oil pump 300 is large, and the amount of oil participating in circulation can be increased, and correspondingly, the small displacement mode is that the oil pump 300 operates in a set small displacement mode, and the displacement of the oil pump 300 is reduced compared with the large displacement mode, and thus the amount of oil participating in circulation is reduced.
In specific implementation, the corresponding displacement of the oil pump 300 in the large and small displacement modes can be determined by the design or model selection of the oil pump 300, and the displacement of the oil pump can meet the requirements of the engine oil pump control system of the embodiment.
As shown in connection with fig. 1, the control system as a whole comprises an acquisition unit 200, and a control unit 100 connected to the acquisition unit 200. The acquisition unit 200 of the present embodiment includes a dilution ratio acquisition module 201 and a temperature acquisition module 202. The dilution rate acquisition module 201 is used for acquiring the dilution rate of engine oil in the engine, and the temperature acquisition module 202 is used for acquiring the temperature of the engine oil.
In practical applications, in order to facilitate the collection of the dilution rate of the engine oil, the present embodiment also collects the oil level in the engine to obtain the dilution rate of the engine oil. At this time, since the oil level in the oil pan is different from that of the oil component alone when the oil is mixed with the fuel, the more the fuel is mixed, the higher the oil level becomes relatively.
Therefore, the dilution rate of fuel oil in the engine oil can be represented through the engine oil liquid level in the oil pan, and in the implementation process, the appropriate corresponding relation between the engine oil liquid level and the dilution rate is obtained through processing of multiple times of test data, so that the dilution rate values or intervals corresponding to different engine oil liquid levels are set, and the dilution rate can be represented by the engine oil liquid level.
Therefore, the control unit 100 can obtain a corresponding dilution ratio value through detecting the oil level in the oil pan of the engine. Furthermore, on the basis of the corresponding relationship between the oil level and the dilution ratio, the embodiment of course also enables the control unit 100 to obtain the corresponding dilution ratio degree only by judging the oil level detection value. This is not only possible, but also simplifies the system control process by using the oil level directly, as opposed to converting it to a dilution ratio for subsequent processing.
In this embodiment, the dilution rate acquisition module 201 may generally adopt an engine oil level sensor for detecting an engine oil level in the engine. For the collection of the engine oil temperature, in addition to the fact that the temperature sensing component may be disposed in the oil pan to detect the engine oil temperature, similar to the above-mentioned arrangement of the dilution ratio collection module 201, the present embodiment also enables the control unit 100 to obtain the engine oil temperature by collecting the temperature of the cooling water in the engine.
In this case, since the engine oil temperature, the cooling water temperature, and the overall engine temperature are in a positive correlation, and a heat exchange process is also present between the engine cooling water and the engine oil, the engine oil temperature in the engine can be well expressed by using the cooling water temperature. However, in order to ensure the accuracy of the collected oil temperature, in practical implementation, the collecting point of the cooling water temperature should preferably be close to the oil inlet of the oil pump, or when a cooling water channel is arranged in the oil pan, the collecting point of the cooling water temperature may also be arranged at the water outlet of the cooling water channel of the oil pan.
The cooling water temperature is generally detected by a temperature sensor for detecting the temperature of the cooling water in the engine. In addition, similar to the above-mentioned determination of the degree of oil dilution rate only by the oil level, in the embodiment, the corresponding oil temperature level can be obtained only by determining the detected value of the cooling water temperature. Therefore, the temperature of the engine oil can be represented by the temperature of the cooling water, and the control effect can be achieved in cooperation with the judgment of the liquid level of the engine oil.
In this embodiment, in addition to the dilution ratio acquisition module 201 and the temperature acquisition module 202, as a further implementation form, the acquisition unit 200 further includes a rotation speed acquisition module 203 and a torque acquisition module 204. The rotation speed acquisition module 203 is used for acquiring the rotation speed of the engine, the torque acquisition module 204 is used for acquiring the torque of the engine, and the rotation speed acquisition module 203 and the torque acquisition module can respectively adopt related sensing parts applied to the existing engine.
The control unit 100 of the present embodiment is configured to control the operation of the oil pump 300 according to the collected information, and when the control unit 300 is implemented, the engine ECU is usually adopted. In the control system of the present embodiment, the corresponding engine oil pump control method is as follows when the system is applied specifically.
At this time, in combination with the engine oil pump control method shown in fig. 2, the engine oil pump control method of the present embodiment includes the steps of:
step 101, obtaining a dilution rate of engine oil in an engine and an engine oil temperature.
In step 101, the dilution rate of the engine oil in the engine is obtained, specifically, the dilution rate of the engine oil is obtained by collecting the oil level of the engine oil, and the oil level is collected by using an oil level sensor disposed in an oil pan of the engine.
Further, as for the acquisition of the oil temperature, it acquires the oil temperature by collecting the cooling water temperature in the engine as described above. The temperature of the engine cooling water is detected by a temperature sensor provided in the engine, which is preferably arranged close to an oil inlet of the oil pump or at a water outlet of the oil pan cooling water channel.
And 102, when the dilution rate is not lower than a preset dilution rate threshold and the engine oil temperature is not lower than a preset temperature threshold, enabling the engine oil pump 300 to work in a large displacement mode.
In step 102, specifically, after the control unit 300 obtains the dilution ratio of the engine oil in the engine and the engine oil temperature, the obtained dilution ratio and the obtained engine oil temperature are determined by a preset dilution ratio threshold and a preset temperature threshold.
At this time, based on the above obtaining of the engine oil dilution rate and the engine oil temperature through the engine oil liquid level and the cooling water temperature, in this embodiment, the preset dilution rate threshold is also a preset engine oil liquid level threshold k in the control unit, and the preset temperature threshold is specifically a preset temperature threshold t in the control unit, which is associated with the collected cooling water temperature. The comparison between the above dilution ratio and the preset dilution ratio threshold, that is, the comparison between the oil level and the preset oil level threshold k, and the comparison between the above oil temperature and the preset temperature threshold, that is, the comparison between the cooling water temperature and the preset temperature threshold t.
In the specific determination, when the obtained dilution ratio is lower than the preset dilution ratio threshold and the obtained engine oil temperature is lower than the preset temperature threshold, the control unit 300 may generally control the engine oil pump 300 to operate in the small displacement mode, or according to a preset control manner in the control unit 300, the engine oil pump 300 may also operate in the large displacement mode.
When the obtained dilution ratio is not lower than the preset dilution ratio threshold and the obtained engine oil temperature is lower than the preset temperature threshold, the control unit 300 may still control the engine oil pump 300 to operate in the small displacement mode, or may control the operating mode of the engine oil pump 300 according to a preset control manner in the control unit 300.
When the obtained dilution ratio is lower than the preset dilution ratio threshold and the obtained engine oil temperature is not lower than the preset temperature threshold, the control unit 300 may still control the engine oil pump 300 to operate in the small displacement mode, or may control the operating mode of the engine oil pump 300 according to a preset control manner in the control unit 300.
When the obtained dilution rate is not lower than the preset dilution rate threshold and the obtained engine oil temperature is not lower than the preset temperature threshold, the control unit 300 controls the engine oil pump 300 to work in the large displacement mode to increase the engine oil circulation amount, increase the agitation of the engine oil, accelerate the evaporation speed of the fuel oil in the oil pan, and effectively reduce the engine oil dilution rate.
It can be understood that, when the control unit 300 controls the oil pump 300 to operate in the small displacement mode, the energy consumption of the oil pump 300 can be reduced under the condition that the requirement of oil lubrication is met, which is beneficial to improving the operation economy of the engine.
In addition, as a preferred embodiment of the present embodiment, when it is determined that the engine oil dilution rate is lower than the preset dilution rate threshold, the control method of the present embodiment may further obtain the engine speed and the engine torque, and control the oil pump 300 to operate in the large displacement mode by the control unit when the engine speed is not lower than the preset speed threshold n and the engine torque is not lower than the preset torque threshold T.
At this time, as also described above, the acquisition of the engine speed and the engine torque may be achieved by using related sensing means applied to the existing engine.
Further, when the obtained engine speed is lower than the preset speed threshold n and the engine torque is not lower than the preset torque threshold T, the control unit controls the oil pump 300 to operate in the small displacement mode, and meanwhile, when the obtained engine speed is not lower than the preset speed threshold n and the engine torque is lower than the preset torque threshold T, the control unit also controls the oil pump 300 to operate in the small displacement mode.
Further, it should be noted that the present embodiment preferably also enables the control unit 100 to control the oil pump 300 to operate in its small displacement mode within a preset time threshold after the engine is on the vehicle. Therefore, the engine oil circulation quantity is low in a period of time after the engine is in the vehicle, the temperature of the engine is favorably increased, and the engine can enter a better operation condition as soon as possible.
The preset time threshold of the engine after the vehicle is parked in the embodiment can be set according to the design of the engine performance. And in the case of engine operation, that is, when the engine is not shut down, the control method described above is cyclically executed under the control of the control unit to achieve effective control of the oil pump 300.
According to the engine oil pump control system and the control method thereof, when the oil dilution rate exceeds the preset threshold and the oil temperature reaches the preset threshold, the oil pump is used for working in a large-displacement mode, the stirring of the oil is increased, the evaporation speed of fuel oil in the oil pan can be accelerated, and the oil dilution rate can be effectively reduced.
Example two
The embodiment relates to a vehicle, and the vehicle is provided with the engine oil pump control system in the first embodiment.
The vehicle of this embodiment passes through control oil pump work in big discharge mode, can accelerate the evaporation rate of fuel in the oil pan, can effectively reduce the machine oil dilution rate, and has fine practicality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An engine oil pump control method is characterized in that: the oil pump (300) is a variable displacement oil pump, and the control method includes:
obtaining the dilution rate and the temperature of engine oil in an engine; and the number of the first and second groups,
and when the dilution rate is not lower than a preset dilution rate threshold and the engine oil temperature is not lower than a preset temperature threshold, enabling the engine oil pump (300) to work in a large displacement mode.
2. The engine oil pump control method according to claim 1, characterized in that: and acquiring the dilution rate of the engine oil by acquiring the liquid level of the engine oil in the engine.
3. The engine oil pump control method according to claim 1, characterized in that: and acquiring the engine oil temperature by acquiring the temperature of cooling water in the engine.
4. The engine oil pump control method according to claim 1, characterized in that: the control method further comprises the following steps:
when the dilution rate is lower than the preset dilution rate threshold value, acquiring the engine speed and the engine torque;
if the engine rotating speed is not lower than a preset rotating speed threshold value and the engine torque is not lower than a preset torque threshold value, enabling the oil pump (300) to work in a large displacement mode;
otherwise, the oil pump (300) is operated in a small displacement mode.
5. The engine oil pump control method according to any one of claims 1 to 4, characterized in that: and enabling the oil pump (300) to work in a small displacement mode within a preset time threshold after the engine is parked.
6. An engine oil pump control system is characterized in that: the oil pump (300) is a variable displacement oil pump, and the control system comprises an acquisition unit (200) and a control unit (100) connected with the acquisition unit (200), wherein:
the acquisition unit (200) has a dilution ratio acquisition module (201) and a temperature acquisition module (202);
the dilution rate acquisition module (201) is used for acquiring the dilution rate of engine oil in the engine, and the temperature acquisition module (202) is used for acquiring the temperature of the engine oil;
the control unit (100) is used for comparing the dilution rate with a preset dilution rate threshold value and comparing the engine oil temperature with a preset temperature threshold value;
when the dilution rate is not lower than the preset dilution rate threshold and the engine oil temperature is not lower than the preset temperature threshold, the control unit (100) controls the engine oil pump (300) to work in a large displacement mode.
7. The engine oil pump control system of claim 6, wherein:
the dilution rate acquisition module (201) comprises an engine oil liquid level sensor for detecting the level of engine oil in the engine, and the control unit (100) acquires the dilution rate according to the level of the engine oil;
the temperature acquisition module (202) includes a temperature sensor that detects a temperature of cooling water in the engine, and the control unit (100) acquires the engine oil temperature from the cooling water temperature.
8. The engine oil pump control system of claim 6, wherein:
the acquisition unit (200) is provided with a rotating speed acquisition module (203) and a torque acquisition module (204);
the rotating speed acquisition module (203) is used for acquiring the rotating speed of the engine, and the torque acquisition module (204) is used for acquiring the torque of the engine;
the control unit (100) compares the engine speed with a preset speed threshold and compares the engine torque with a preset torque threshold when the dilution ratio is lower than the preset dilution ratio threshold;
when the engine speed is not lower than the preset speed threshold and the engine torque is not lower than the preset torque threshold, the control unit (100) controls the oil pump (300) to work in a large displacement mode.
9. The engine oil pump control system of claim 6, wherein: the control unit (100) employs an engine ECU.
10. A vehicle, characterized in that: an engine oil pump control system according to any one of claims 6 to 9 provided on the vehicle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110480310.8A CN114645747B (en) | 2021-04-30 | 2021-04-30 | Engine oil pump control method and system and vehicle |
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| CN202110480310.8A CN114645747B (en) | 2021-04-30 | 2021-04-30 | Engine oil pump control method and system and vehicle |
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| CN114645747A true CN114645747A (en) | 2022-06-21 |
| CN114645747B CN114645747B (en) | 2023-01-17 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1357280A2 (en) * | 2002-04-26 | 2003-10-29 | Toyota Jidosha Kabushiki Kaisha | Evaporative fuel processing system for in-cylinder fuel injection type internal combustion engine and method |
| JP2010127204A (en) * | 2008-11-28 | 2010-06-10 | Nissan Motor Co Ltd | Lubricating oil dilution preventive device of internal combustion engine |
| CN108506114A (en) * | 2017-02-28 | 2018-09-07 | 日立汽车系统(苏州）有限公司 | Reduce the diluted device and method of engine motor oil |
-
2021
- 2021-04-30 CN CN202110480310.8A patent/CN114645747B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1357280A2 (en) * | 2002-04-26 | 2003-10-29 | Toyota Jidosha Kabushiki Kaisha | Evaporative fuel processing system for in-cylinder fuel injection type internal combustion engine and method |
| JP2010127204A (en) * | 2008-11-28 | 2010-06-10 | Nissan Motor Co Ltd | Lubricating oil dilution preventive device of internal combustion engine |
| CN108506114A (en) * | 2017-02-28 | 2018-09-07 | 日立汽车系统(苏州）有限公司 | Reduce the diluted device and method of engine motor oil |
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