CN117128066A - Lubricating system of engine and control method thereof - Google Patents

Lubricating system of engine and control method thereof Download PDF

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Publication number
CN117128066A
CN117128066A CN202311051088.5A CN202311051088A CN117128066A CN 117128066 A CN117128066 A CN 117128066A CN 202311051088 A CN202311051088 A CN 202311051088A CN 117128066 A CN117128066 A CN 117128066A
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CN
China
Prior art keywords
oil
liquid level
pump
engine
pan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311051088.5A
Other languages
Chinese (zh)
Inventor
仇杰
张子庆
姜钰
张海民
王卫强
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SAIC Motor Corp Ltd
Original Assignee
SAIC Motor Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SAIC Motor Corp Ltd filed Critical SAIC Motor Corp Ltd
Priority to CN202311051088.5A priority Critical patent/CN117128066A/en
Publication of CN117128066A publication Critical patent/CN117128066A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • F01M1/12—Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10
    • 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
    • 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
    • F01M1/18—Indicating or safety devices
    • F01M1/20—Indicating or safety devices concerning lubricant pressure
    • 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
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • 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
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F01M11/12—Indicating devices; Other safety devices concerning lubricant level
    • 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
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0215—Electrical pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

The application provides a lubrication system of an engine and a control method thereof, wherein the lubrication system comprises an oil pan, an external oil tank and an electronic oil pump, the electronic oil pump comprises an oil supply pump and an oil return pump, an inlet of the oil supply pump is communicated with an outlet of the external oil tank, an outlet of the oil supply pump is used for supplying engine oil, an inlet of the oil return pump is communicated with the oil pan, and an outlet of the oil return pump is communicated with an inlet of the external oil tank. The scheme can reduce the depth of the oil pan and improve the height design of the engine.

Description

Lubricating system of engine and control method thereof
Technical Field
The application relates to the technical field of engines, in particular to a lubricating system of an engine and a control method thereof.
Background
The engine oil pump of engine is generally arranged in cylinder body bottom or oil pan inside, in order to guarantee lubrication system's job stabilization, satisfies the engine oil pump and stably inhales the engine oil, and the design of oil pan must satisfy the engine oil storage requirement of a certain amount, therefore, the degree of depth of oil pan is great, leads to the engine height direction size design to be restricted like this. Moreover, the vehicle is driven under the conditions of violent driving or large inclination angle, even if the oil pan is designed to be deeper, the oil pump still has the condition of not sucking the engine oil due to limited design size, so that the lubrication system can be possibly caused to lack the lubrication of the engine oil, and serious consequences such as lack of lubrication of a friction pair, damage of the surface of the friction pair, pull shoe, and locking are caused.
Disclosure of Invention
The application aims to provide a lubrication system of an engine and a control method thereof, which can reduce the depth of an oil pan and improve the height design of the engine.
The application provides a lubricating system of an engine, which comprises an oil pan, an external oil tank and an electronic oil pump, wherein the electronic oil pump comprises an oil supply pump and an oil return pump, an inlet of the oil supply pump is communicated with an outlet of the external oil tank, an outlet of the oil supply pump is used for supplying engine oil, an inlet of the oil return pump is communicated with the oil pan, and an outlet of the oil return pump is communicated with an inlet of the external oil tank.
In one embodiment, at least one of the oil pan and the external oil tank is provided with a liquid level sensor.
In one embodiment, the lubrication system includes an oil passage provided to the engine, and an oil pressure sensor is provided in the oil passage.
In a specific embodiment, the lubrication system comprises an oil duct arranged on the engine, the oil duct comprises an oil inlet duct arranged on a cylinder body of the engine, the lubrication system further comprises an oil cooler and an oil filter, an outlet of the oil supply pump is communicated with an inlet of the oil inlet duct, an outlet of the oil inlet duct is communicated with an inlet of the oil cooler, and an outlet of the oil cooler is communicated with an inlet of the oil filter.
In a specific embodiment, the oil channels comprise a first cylinder body main oil channel, a second cylinder body main oil channel and a connecting oil channel, wherein the first cylinder body main oil channel, the second cylinder body main oil channel and the connecting oil channel are arranged in the cylinder body, the outlet of the oil filter is communicated with the connecting oil channel, the connecting oil channel is communicated with the inlet of the first cylinder body main oil channel, and the first cylinder body main oil channel and the second cylinder body main oil channel are mutually communicated; the oil pressure sensor is arranged in the main oil duct of the first cylinder body;
the oil duct is still including setting up first cylinder cap main oil duct and the second cylinder cap main oil duct of the cylinder cap of engine, first cylinder body main oil duct with first cylinder cap main oil duct intercommunication, the second cylinder body main oil duct with second cylinder cap main oil duct intercommunication.
In a specific embodiment, the oil supply pump and the oil return pump are arranged separately, or the oil supply pump and the oil return pump are of a duplex pump structure driven by the same motor.
The application also provides a control method of the lubrication system of the engine, based on the lubrication system of the engine, the liquid level range of the oil pan and the set oil return amount of the oil return pump are preset, and the oil return pump works with the set oil return amount;
detecting the liquid level of the oil pan, and when the detected liquid level of the oil pan is in the liquid level range, maintaining the oil return pump at the set oil return amount;
when the detected liquid level of the oil pan is lower than the liquid level range, controlling the oil return pump to reduce the oil return amount; and when the detected liquid level of the oil pan is higher than the liquid level range, controlling the oil return pump to increase the oil return amount.
The application also provides a control method of the lubricating system of the engine, based on the lubricating system of the engine, the lower limit value of the liquid level of the external oil tank and the set oil return amount of the oil return pump are preset, and the oil return pump works with the set oil return amount;
detecting the liquid level of the external oil tank, and controlling the oil return pump to keep the set oil return amount when the detected liquid level of the external oil tank is not lower than the lower limit value; and when the detected liquid level of the external oil tank is lower than the lower limit value, controlling the oil return pump to increase the oil return amount.
In a specific embodiment, presetting a liquid level range of the oil pan and detecting the liquid level of the oil pan;
when the detected liquid level of the oil pan is in the liquid level range and the detected liquid level of the external oil tank is not lower than the lower limit value, the oil return pump is kept at the set oil return amount;
when the detected liquid level of the oil pan is lower than the liquid level range and the detected liquid level of the external oil tank is not lower than the lower limit value, controlling the oil return pump to reduce the oil return amount; when the detected liquid level of the oil pan is lower than the liquid level range and the detected liquid level of the external oil tank is lower than the lower limit value, controlling the oil return pump to increase the oil return amount, and carrying out early warning;
and when the detected liquid level of the oil pan is higher than the liquid level range, controlling the oil return pump to increase the oil return amount.
In a specific embodiment, a total engine oil range is preset, the total engine oil is obtained according to the detected liquid level of the oil pan and the detected liquid level of the external oil tank, and when the total engine oil is lower than or higher than the total engine oil range, early warning is performed.
The lubricating system in this application disposes external oil tank, and the machine oil in the oil pan can be carried to external oil tank by the scavenge pump of electronic oil pump in, and like this, the memory space of machine oil is born jointly by external oil tank and oil pan, and the degree of depth of oil pan need not to set up very deeply, as long as possess certain memory space can. The depth of the external oil tank and the engine oil storage amount can meet the requirement that the oil supply pump can suck engine oil under various angles, namely, the depth of the external oil tank can meet the requirement that the engine can supply oil stably under the working condition of violent driving or large inclination, so that the lubrication safety is improved, and correspondingly, the height of the engine is reduced or the dimension design of the engine in the height direction is not limited due to no high requirement on the depth design of the oil pan, and the engine can be designed compacter. The external oil tank is arranged outside the engine, and can be arranged on the air inlet side, the air outlet side or the front end of the engine, so long as the external oil tank does not interfere with other components.
In addition, the engine oil pump is an electronic engine oil pump, is controlled by a motor, is not driven by a chain or a belt driven by an engine, can realize decoupling of engine oil control pressure and engine rotating speed of the engine oil pump, is beneficial to realizing accurate control of engine oil demand, and reduces power consumption of the engine oil pump.
In addition, the application also provides a control method of the lubricating system of the engine, which can control the oil return amount of the oil return pump according to the detected liquid level of the oil pan and the external oil tank, so as to be beneficial to realizing the dynamic balance of the liquid level and ensure the supply of lubricating oil.
Drawings
FIG. 1 is a schematic illustration of a lubrication system of an engine in an embodiment of the present application;
FIG. 2 is a schematic block diagram of an oil return circuit of the lubrication system of FIG. 1;
FIG. 3 is a schematic block diagram of an oil supply circuit of the lubrication system of FIG. 1;
fig. 4 is a control flow diagram of a lubrication system of an engine in an embodiment of the application.
The reference numerals in fig. 1-4 are illustrated as follows:
10-an oil pan; 11-a first level sensor; 12-a first oil return pipeline;
20-an electronic oil pump;
21-an external oil tank; 22-a second level sensor; 23-a second oil return pipeline; 24-an oil cooler; 25-an oil filter; 26-an oil inlet duct; 27-a first main oil duct of the cylinder body; 28-a cylinder body second main oil duct; 281-piston cooler nozzle; 282-supercharger inlet tube; 283-timing chain tensioner; 284-timing chain nozzle; 29-main journal; 291-connecting rod journal;
30-balance shaft module; 301-high pressure oil pump; 31-an oil pressure sensor; 32-a first main oil duct of the cylinder cover; 321-a first VVT; 33-a cylinder cover second main oil duct; 331-a second VVT; 34-a first camshaft bore; 341-a first side hydraulic lifter; 342-first side camshaft; 35-a second camshaft bore; 351-second side hydraulic lifter; 352-second side hydraulic lifter.
Detailed Description
In order to better understand the aspects of the present application, the present application will be described in further detail with reference to the accompanying drawings and detailed description.
Referring to fig. 1, fig. 1 is a schematic diagram of a lubrication system of an engine according to an embodiment of the present application, and fig. 1 mainly illustrates a part of a part to be lubricated of the lubrication system and an oil passage through which engine oil flows.
The lubrication system of the engine in this embodiment includes the oil pan 10, the external oil tank 21 and the electronic oil pump 20, the electronic oil pump 20 includes the oil supply pump and the oil return pump, the oil supply pump and the oil return pump are separate electronic pumps, that is, are driven by respective motors, or the oil supply pump and the oil return pump may be a duplex pump structure driven by the same motor, and the duplex pump structure is more compact in arrangement, and can save space. The inlet of the oil feed pump is communicated with the outlet of the external oil tank 21, the outlet of the oil feed pump is used for providing lubricating oil, namely, lubricating oil is provided for all parts of the engine which need to be lubricated, the inlet of the oil return pump is communicated with the oil pan 10, the inlet of the oil return pump is particularly communicated with the outlet of the oil pan 10 through a first oil return pipeline 12 in fig. 1, the outlet of the oil return pump is communicated with the inlet of the external oil tank 21, the outlet of the oil return pump is particularly communicated with the inlet of the external oil tank 21 through a second oil return pipeline 23 in fig. 1, and the communicating pipelines of the oil feed pump and the external oil tank 21 are not illustrated in fig. 1.
It will be appreciated with continued reference to fig. 2, which is a schematic block diagram of the scavenge oil circuit of the lubrication system of fig. 1.
The engine oil returned to the oil pan 10 in the engine can return to the oil pan 10 through an oil suction pipe, the oil return pump in the electronic oil pump 20 sucks the engine oil in the oil pan 10 and conveys the engine oil to the external oil tank 21 through the first oil return pipeline 12, and the engine oil in the external oil tank 21 can be sucked through a corresponding communicating pipe by the oil supply pump of the electronic oil pump 20 and then conveyed to parts needing lubrication of the engine or other parts needing engine oil for lubrication.
With continued reference to fig. 3, fig. 3 is a schematic block diagram of an oil supply passage of the lubrication system of fig. 1.
The lubrication system of the engine comprises an oil duct, the oil duct is integrated on a body of the engine, and the body of the engine mainly comprises a cylinder body and a cylinder cover, so the oil duct is directly formed on the cylinder body or the cylinder cover in a mode of machining, casting and the like, and the embodiment is not described again with reference to the prior art. Specifically, the oil passages include a first oil inlet passage 26, a second oil inlet passage 271, a first main oil passage 27, and a second main oil passage 28, which are provided on the cylinder block, and the first main oil passage 27 and the second main oil passage 28 are communicated with each other, and the oil passage of the lubrication system further includes a first main oil passage 32 and a second main oil passage 33, which are provided on the cylinder head.
In addition, the lubrication system further includes an oil cooler 24 for cooling the oil and an oil filter 25 for filtering the oil, the oil cooler 24 being provided. The outlet of the oil pump of the electronic oil pump is communicated with the inlet of the first oil inlet passage 271, the outlet of the first oil inlet passage 271 is communicated with the inlet of the oil cooler 24, and the outlet of the oil cooler 24 is communicated with the inlet of the oil filter 25. Like this, after all pegging graft oil cooler 24 and oil feed pump to the corresponding interface of first oil feed oil duct 217, can be through the oil duct of cylinder body with oil feed pump and oil cooler 24 switch-on, need not external pipeline, the structure is comparatively compact.
That is, the oil feed pump pumps the lubricant to the first oil feed passage 271 on the engine block, then the lubricant is delivered to the oil cooler 24 through the first oil feed passage 271, flows into the oil filter 25 after passing through the oil cooler 24, and the filtered engine oil enters the second oil feed passage 26, and the second oil feed passage 26 communicates with the block first main oil passage 27. As can be seen from fig. 1, the cylinder first main oil passage 27 and the cylinder second oil passage 28 are approximately parallel, and are arranged close to the cylinder cover, the oil filter 25 is arranged at the lower sides of the two main oil passages, and the second oil inlet passage 26 extending up and down is arranged at this time to facilitate the communication between the cylinder first main oil passage 27 and the oil filter 25.
The wall of the cylinder body first main oil duct 27 is provided with a plurality of oil holes, the cylinder body first main oil duct 27 can supply oil to the corresponding balance shaft module 30 and main journal 29 through the corresponding oil holes, the main journal 29 is the journal of the crankshaft main bearing, and the balance shaft module 30 and the main journal 29 belong to two parts which need lubrication in the engine. Referring again to fig. 3, the engine oil requiring components further include a high-pressure oil pump 301, a connecting rod journal 291, and the connecting rod journal 291 is a journal of a connecting rod bearing, wherein the high-pressure oil pump 301 is in communication with the balance shaft module 30, the main journal 29 is in communication with the connecting rod journal 291, the main journal 29 further supplies oil to the connecting rod journal 291 through an oil hole of a crankshaft after the main journal 29 and the balance shaft module 30 are supplied with oil from the cylinder body first main oil passage 27, and the balance shaft module 30 further supplies oil to the high-pressure oil pump through an oil hole opened therein.
The engine oil requiring parts further include a first side camshaft 342 and a first side hydraulic lifter 341 and a first VVT321 (Variable Valve Timing ), the block first main oil passage 27 further supplies engine oil to the head first main oil passage 32, the head first main oil passage 32 communicates with the first camshaft hole 34 and supplies the first VVT321 with oil, and the first camshaft hole 34 further supplies engine oil to the first side camshaft 342 and the first side hydraulic lifter 341.
The cylinder first main oil passage 27 is also communicated with the cylinder second main oil passage 28, a plurality of oil holes are also formed in the wall of the cylinder second main oil passage 28, the cylinder second main oil passage 28 can supply oil to a timing chain nozzle 284, a timing chain tensioner 283, a supercharger oil inlet pipe 282 and a piston cooler nozzle 281 (a piston for cooling an engine) through the corresponding oil holes, meanwhile, the cylinder second main oil passage 28 is also communicated with the cylinder second main oil passage 33, the cylinder second main oil passage 33 is communicated with the second cam shaft hole 35 and the second VVT331 (Variable Valve Timing ), and engine oil flows from the second cam shaft hole 35 to the second side cam shaft 352 and the second side hydraulic tappet 351. The two cylinder cover main oil channels correspond to the two cylinder body main oil channels in position and are also arranged approximately in parallel, and oil can be supplied for two symmetrical groups of cam shafts and hydraulic lifters.
The oil supply path shown in fig. 3 is only an illustration, and it can be understood that the components to be lubricated of the engine can be adjusted according to actual requirements, and at this time, the connection relationship of the corresponding components and the oil path can be adaptively adjusted, which is not limited in this embodiment. In the embodiment, the two main oil ducts are arranged on the cylinder body and the cylinder cover of the engine, so that engine oil is conveniently supplied to all parts through the main oil ducts, and the parts are easy to arrange and compact in structure.
It can be seen that after the engine oil flows out from the oil supply pump of the electronic engine oil pump 20, the engine oil can flow into a plurality of components through the oil passage on the engine after being cooled and filtered, and after the friction pair lubrication of each component is completed, the engine oil enters the oil return pipeline through the oil return passage part on the engine oil passage and returns to the oil pan 10 again.
In this embodiment, the lubricating system is configured with the external oil tank 21, and the engine oil in the oil pan 10 can be delivered to the external oil tank 21 by the oil return pump of the electronic oil pump 20, so that the storage amount of the engine oil is borne by the external oil tank 21 and the oil pan 10 together, the depth of the oil pan 10 is not required to be deeper, and as long as a certain storage amount is provided, the height of the engine is reduced, or the dimension design in the height direction of the engine is not limited, and the engine can be designed more compactly. The external fuel tank 21 may be provided outside the engine, on the intake side, the exhaust side, the front end, or the like of the engine, as long as it does not interfere with other components.
In addition, the oil pump in this embodiment is an electronic oil pump 20, and is controlled by a motor, and is not driven by a chain or belt driven by an engine, so that decoupling of the oil control pressure of the oil pump and the engine speed can be realized, accurate control of the oil demand of the engine can be realized, and the power consumption of the oil pump can be reduced.
In this embodiment, the lubrication system further includes an oil pressure sensor 31, where the oil pressure sensor 31 may be disposed in an oil passage of the engine, as shown in fig. 1, the oil pressure sensor 31 is specifically disposed in the cylinder first main oil passage 27, and the cylinder first main oil passage 27 is located downstream of the oil filter 24, generally upstream of the entire lubrication system, so as to more accurately reflect the oil pressure. The oil pressure sensor 31 may detect the oil pressure. When the engine works, the control unit ECU (Electronic Control Unit ) of the engine can obtain the performance parameters such as the rotating speed and the power of the engine, and accordingly control the rotating speed of the oil supply pump of the electronic oil pump 20 to lubricate the oil supply way system, meanwhile, the control unit ECU can obtain the feedback of the oil pressure sensor 31 in the first main oil duct 27 of the cylinder body, and compare the feedback with the preset engine oil pressure, and if deviation occurs, the control unit ECU can control the motor rotating speed of the oil supply pump of the electronic oil pump 20 to adjust the oil supply quantity, correct the target oil pressure and ensure the working stability and reliability of the lubrication system. The control unit ECU may specifically prestore a map of the oil pressure, and accordingly correct and adjust the target oil pressure.
In theory, the oil supply pump and the oil return pump of the electronic oil pump 20 are kept at the same flow rate, and the oil pan 10 and the external oil tank 21 can keep the liquid level unchanged. However, due to the difference in manufacturability of the parts and the variation in the temperature and viscosity of the engine oil during the actual operation of the engine, the efficiency of the electronic oil pump 20 may be different, and the oil return pump and the oil supply pump flow rate of the electronic oil pump 20 may be different, so that the liquid levels of the oil pan 10 and the external oil tank 21 may be changed.
As shown in fig. 1, in the present embodiment, the oil pan 10 is further provided with a first liquid level sensor 11, and the first liquid level sensor 11 is configured to detect the liquid level of the oil in the oil pan 10. In this way, the amount of return oil of the return oil pump can be controlled according to the amount of engine oil in the oil pan 10.
It can be appreciated in connection with fig. 4, fig. 4 is a control flow diagram of a lubrication system of an engine in an embodiment of the application.
The lubrication system can be controlled according to the following steps:
s1, presetting a liquid level range of the oil pan 10 and setting oil return quantity of an oil return pump of the electronic oil pump 20, wherein the oil return pump works with the set oil return quantity.
The liquid level range is not a specific value, but a range interval of liquid levels, for example, the liquid level range of the set oil pan 10 is h 1-h 2, where h2> h1, h1>0, h1 is a lower limit value of the liquid level of the oil pan 10, h2 is an upper limit value of the liquid level of the oil pan 10, if the liquid level of the oil pan 10 exceeds the upper limit value h2 of the liquid level of the oil pan 10, it indicates that too much engine oil in the oil pan 10 may cause stirring of the crankshaft during the engine operation, if the liquid level of the oil pan 10 exceeds the lower limit value h1 of the liquid level of the oil pan 10, it indicates that too little engine oil in the oil pan 10 may cause a suction risk of an oil return pump of the electronic oil pump 20, and affects durability and reliability of the oil return pump parts, so under normal engine operation conditions, the oil level in the oil pan 10 needs to be controlled within a certain height range, and the values of h1 and h2 are specifically set according to the above factors.
The set oil return amount of the oil return pump is the initial oil return amount of the oil return pump, namely, the oil return amount of the oil return pump is determined according to the theoretical working states of the oil supply pump and the oil return pump, and the oil return pump works with the set oil return amount after the engine is started.
S2, detecting the liquid level of the oil pan 10, executing a step S3 when the detected liquid level of the oil pan 10 is within a preset liquid level range, and executing a step S4 if the detected liquid level of the oil pan 10 is no longer in a preset liquid level range;
s3, maintaining the oil return pump of the electronic oil pump 20 at a set oil return amount;
s4, when the detected liquid level of the oil pan 10 is lower than a preset liquid level range, namely lower than the lower limit value of the liquid level of the oil pan 10, indicating that the oil of the oil pan 10 is too low, controlling an oil return pump to reduce the oil return amount, namely reducing the oil return amount on the basis of the current oil return amount, and executing a step S5; when the detected liquid level of the oil pan 10 is higher than the preset liquid level range, that is, higher than the upper limit value of the liquid level of the oil pan 10, indicating that the oil of the oil pan 10 is too much, the oil return pump can be controlled to increase the oil return amount, that is, the oil return amount is increased on the basis of the current oil return amount, and the step S5 is executed; the control of the oil return pump can be performed by a control unit, and the control unit can be an independent control module or controlled by a control unit ECU;
and S5, continuously detecting the change of the liquid level of the oil pan 10, if the detected liquid level is still outside the preset liquid level range, repeating the step S2, and when the detected liquid level is within the preset liquid level range, the oil return pump of the electronic oil pump 20 can work again with the preset oil return amount. It can be seen that the present embodiment can achieve dynamic balancing of the liquid levels of the oil pan 10 and the external oil tank 21 by adjusting the flow rate of the scavenge pump.
The oil return pump of the electronic oil pump 20 can be provided with an electromagnetic valve, and the electromagnetic valve controls the oil return pump to be communicated with the flow passage sectional area of the first oil return pipeline 12, so that the flow rate of the oil return pump is regulated, and the oil return pump is kept at the initial position when the oil return pump works with the set oil return amount. When the oil return amount of the oil return pump is controlled, the purpose of controlling the oil return amount can be achieved by directly controlling the opening of the electromagnetic valve. Of course, other flow regulation methods are also possible for the scavenging pump of the electronic oil pump 20, such as a solenoid valve or the like being provided in the first scavenging line 12.
In addition, the design displacement of the scavenge pump in the electronic oil pump 20 may be larger than the design displacement of the oil supply pump, and the motor controls the rotation speed of the oil supply pump according to the lubrication requirement to control the oil supply amount. In the embodiment, the oil return pump and the oil supply pump are controlled by the same motor, so that the oil supply pump can not adjust the rotation speed of the oil return pump after determining the rotation speed of the motor according to the lubrication requirement, and the electromagnetic valve is arranged for adjusting the rotation speed of the oil return pump, so that the oil return pump can be directly controlled by the motor to adjust the oil return amount when the oil return pump has independent motor control.
Referring again to fig. 1, in this embodiment, a second level sensor 22 may be disposed in the external oil tank 21, where the second level sensor 22 is configured to detect the level of the engine oil in the external oil tank 21. The lower limit value of the liquid level of the external oil tank 21 can be preset, and the oil return pump works with the set oil return amount. The oil in the lubrication system is sucked from the external oil tank 21 by the oil supply pump, when the detected liquid level of the oil in the external oil tank 21 is lower than the preset lower limit value, the lubrication system has oil supply risk, namely insufficient oil supply can be possibly caused, and at the moment, the flow of the oil return pump of the electronic oil pump 20 can be controlled and regulated so as to increase the oil return quantity, namely the oil return quantity is increased on the basis of the current oil return quantity, so that more oil is transferred from the oil pan 10 to the external oil tank 21, and the oil supply quantity is ensured.
It is understood that when the first liquid level sensor 11 and the second liquid level sensor 22 are provided at the same time, the liquid levels of the oil pan 10 and the external oil tank 21 may be controlled in combination.
When the detected liquid level of the oil pan 10 is within the preset liquid level range and the detected liquid level of the external oil tank 21 is not lower than the set lower limit value, the oil return pump can be kept at the set oil return amount;
when the detected liquid level of the oil pan 10 is lower than a preset liquid level range and the detected liquid level of the external oil tank 21 is not lower than a lower limit value, controlling the oil return pump to reduce the oil return amount, namely, when the liquid level of the oil pan 10 is lower and the liquid level of the external oil tank 21 is not lower, reducing the oil return amount to ensure that the liquid level of the oil pan 10 is increased;
when the detected liquid level of the oil pan 10 is lower than a preset liquid level range and the detected liquid level of the external oil tank 21 is also lower than a lower limit value, controlling an oil return pump to increase the oil return amount, and performing early warning, wherein the control unit ECU can send early warning information; that is, when the amounts of oil in the external oil tank 21 and the oil pan 10 are both low, the amount of oil in the external oil tank 21 is preferentially ensured, and sufficient supply of lubricating oil is ensured, but obviously, the amount of oil in the oil pan 10 is insufficient to continue to compensate the amount of oil in the external oil tank 21, and at this time, a driver needs to be warned in a warning manner that the current engine state may have a fault, so that the driver of the vehicle is reminded to check the engine state.
When the detected liquid level of the oil pan 10 is higher than the preset liquid level range and the liquid level of the external oil tank 21 is lower than the preset lower limit value, the oil return pump can be controlled to increase the oil return amount, so that the oil pan 10 can be kept to operate at the lower limit value of the preset liquid level range, and of course, the oil return pump is increased by a certain oil return amount to enable the liquid level of the external oil tank 21 to reach the standard, so that the liquid level of the oil pan 10 is not required to be at the lowest lower limit value.
When the detected liquid level of the oil pan 10 is higher than the preset liquid level range and the liquid level of the external oil tank 21 is not lower than the preset lower limit value, the liquid level of the external oil tank 21 can be increased by increasing the oil return amount, the liquid level of the external oil tank 21 is increased without adverse effect, and the liquid level change of the external oil tank 21 can be not considered when the oil return amount is increased.
In addition, when the external oil tank 21 and the oil pan 10 are both provided with corresponding liquid level sensors, the total oil amount range of the total oil amount can be preset, the total oil amount can be obtained by summing the detection values of the first liquid level sensor 11 and the second liquid level sensor 22, and when the detected total oil amount is lower than or higher than the preset total oil amount range, an early warning can be provided for the vehicle to remind the vehicle driver to check the engine state. The early warning mode in this embodiment is, for example, by lighting a fault lamp, performing an alarm warning, and the like.
The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.

Claims (10)

1. The utility model provides a lubrication system of engine, its characterized in that includes oil pan, external oil tank and electronic oil pump, electronic oil pump includes feed pump and returns oil pump, feed pump's entry with the export intercommunication of external oil tank, feed pump's export is used for providing the engine oil, return oil pump's entry with the oil pan intercommunication, return oil pump's export intercommunication external oil tank's entry.
2. The lubrication system of an engine according to claim 1, wherein at least one of the oil pan and the external oil tank is provided with a liquid level sensor.
3. The lubrication system of an engine according to claim 1, characterized in that the lubrication system comprises an oil passage provided in the engine, in which oil passage an oil pressure sensor is provided.
4. The lubrication system of claim 3, wherein the lubrication system comprises an oil passage provided to the engine, the oil passage comprising an oil inlet passage provided to a block of the engine, the lubrication system further comprising an oil cooler and an oil filter, an outlet of the oil pump communicating with an inlet of the oil inlet passage, an outlet of the oil inlet passage communicating with an inlet of the oil cooler, and an outlet of the oil cooler communicating with an inlet of the oil filter.
5. The lubrication system of the engine according to claim 4, wherein the oil passages include a first cylinder main oil passage, a second cylinder main oil passage, and a connecting oil passage provided in the cylinder, the outlet of the oil cleaner being in communication with the connecting oil passage, the connecting oil passage being in communication with the inlet of the first cylinder main oil passage, the first cylinder main oil passage and the second cylinder main oil passage being in communication with each other; the oil pressure sensor is arranged in the main oil duct of the first cylinder body;
the oil duct is still including setting up first cylinder cap main oil duct and the second cylinder cap main oil duct of the cylinder cap of engine, first cylinder body main oil duct with first cylinder cap main oil duct intercommunication, the second cylinder body main oil duct with second cylinder cap main oil duct intercommunication.
6. The lubrication system of an engine according to any one of claims 1 to 6, wherein the oil feed pump and the scavenge pump are provided separately, or the oil feed pump and the scavenge pump are of a dual pump structure driven by the same motor.
7. A control method of a lubrication system of an engine, based on the lubrication system of an engine according to any one of claims 1-6, characterized in that a liquid level range of the oil pan and a set oil return amount of the oil return pump are preset, the oil return pump operating with the set oil return amount;
detecting the liquid level of the oil pan, and when the detected liquid level of the oil pan is in the liquid level range, maintaining the oil return pump at the set oil return amount;
when the detected liquid level of the oil pan is lower than the liquid level range, controlling the oil return pump to reduce the oil return amount; and when the detected liquid level of the oil pan is higher than the liquid level range, controlling the oil return pump to increase the oil return amount.
8. A control method of a lubrication system of an engine, based on the lubrication system of an engine according to any one of claims 1-6, characterized in that a lower limit value of the liquid level of the external oil tank and a set oil return amount of the oil return pump are preset, the oil return pump operating with the set oil return amount;
detecting the liquid level of the external oil tank, and controlling the oil return pump to keep the set oil return amount when the detected liquid level of the external oil tank is not lower than the lower limit value; and when the detected liquid level of the external oil tank is lower than the lower limit value, controlling the oil return pump to increase the oil return amount.
9. The control method of a lubrication system of an engine according to claim 8, characterized by presetting a liquid level range of the oil pan, detecting a liquid level of the oil pan;
when the detected liquid level of the oil pan is in the liquid level range and the detected liquid level of the external oil tank is not lower than the lower limit value, the oil return pump is kept at the set oil return amount;
when the detected liquid level of the oil pan is lower than the liquid level range and the detected liquid level of the external oil tank is not lower than the lower limit value, controlling the oil return pump to reduce the oil return amount; when the detected liquid level of the oil pan is lower than the liquid level range and the detected liquid level of the external oil tank is lower than the lower limit value, controlling the oil return pump to increase the oil return amount, and carrying out early warning;
and when the detected liquid level of the oil pan is higher than the liquid level range, controlling the oil return pump to increase the oil return amount.
10. The method according to claim 9, wherein a total oil range of the engine oil is preset, the total oil is obtained based on the detected liquid level of the oil pan and the detected liquid level of the external oil tank, and when the total oil is lower or higher than the total oil range, an early warning is performed.
CN202311051088.5A 2023-08-18 2023-08-18 Lubricating system of engine and control method thereof Pending CN117128066A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311051088.5A CN117128066A (en) 2023-08-18 2023-08-18 Lubricating system of engine and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311051088.5A CN117128066A (en) 2023-08-18 2023-08-18 Lubricating system of engine and control method thereof

Publications (1)

Publication Number Publication Date
CN117128066A true CN117128066A (en) 2023-11-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311051088.5A Pending CN117128066A (en) 2023-08-18 2023-08-18 Lubricating system of engine and control method thereof

Country Status (1)

Country Link
CN (1) CN117128066A (en)

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