CN117514411A - Engine lubrication system and engine lubrication control method - Google Patents

Abstract

The invention relates to the technical field of engine lubrication, and discloses an engine lubrication system and an engine lubrication control method. The engine lubrication system includes: an oil tank; the oil pump is provided with an oil inlet, an oil outlet and a variable adjusting port, and the oil inlet of the oil pump is communicated with the oil tank; the main oil duct is communicated with an oil outlet of the oil pump; the variable regulating valve is communicated with the main oil duct and the variable regulating port; a rotation speed detecting member adapted to detect a rotation speed of the engine; the pressure detection piece is suitable for detecting the oil pressure of the main oil duct; and the controller is electrically connected with the variable regulating valve, the rotating speed detecting piece and the pressure detecting piece. The variable adjustment of the oil pump is realized by feeding back part of lubricating oil of the main oil duct to the oil pump, the oil pressure of the main oil duct is controlled more accurately, the condition of high oil consumption caused by overhigh pressure of the main oil duct is avoided, the minimum power consumption of the oil pump is realized, the economy of an engine is effectively improved, and the energy conservation and emission reduction are realized.

Description

Engine lubrication system and engine lubrication control method

Technical Field

The invention relates to the technical field of engine lubrication, in particular to an engine lubrication system and an engine lubrication control method.

Background

Along with the upgrading of national emission regulations and the aim of double carbon, higher requirements are put forward on energy conservation and emission reduction of an engine, and a lubrication system is an important subsystem for ensuring the normal operation of the engine, so that the lubrication system is required to provide a proper lubrication function according to the working condition of the engine so as to enable the engine to work in an optimal state; meanwhile, lubricating oil with proper temperature, flow and pressure is required to be provided according to lubricating requirements so as to meet the requirements of all lubricating systems, and the lubricating oil is provided with proper flow with an oil pump, so that the minimum power consumption of the oil pump is realized, the economy of an engine can be effectively improved, and the energy conservation and emission reduction are realized.

At present, a constant flow oil pump is generally adopted in a lubricating system, and when the pressure of a main oil duct is too high, the main oil duct cannot be regulated, so that the oil consumption of an engine is high.

Disclosure of Invention

In view of this, the present invention provides an engine lubrication system and an engine lubrication control method, so as to solve the problem of high oil consumption caused by the constant flow oil pump adopted in the lubrication system in the prior art.

In a first aspect, the present invention provides an engine lubrication system comprising: an oil tank; the oil pump is provided with an oil inlet, an oil outlet and a variable adjusting port, and the oil inlet of the oil pump is communicated with the oil tank; the main oil duct is communicated with an oil outlet of the oil pump and is suitable for being arranged on an engine; the variable regulating valve is communicated with the main oil duct and the variable regulating port; a rotation speed detecting member adapted to detect a rotation speed of the engine; the pressure detection piece is suitable for detecting the oil pressure of the main oil duct; and the controller is electrically connected with the variable regulating valve, the rotating speed detecting piece and the pressure detecting piece and is used for controlling whether the variable regulating valve acts or not according to the rotating speed detected by the rotating speed detecting piece and the oil pressure detected by the pressure detecting piece.

The beneficial effects are that: the oil pressure of the main oil duct and the rotating speed of the engine are detected through the pressure detection piece, the detected oil pressure signal and the rotating speed signal which are detected by the rotating speed detection piece are sent to the controller, the controller controls whether the variable regulating valve acts according to the current rotating speed signal of the engine and the current oil pressure signal of the main oil duct, when the pressure of the main oil duct is not high, variable regulation is not needed, the variable regulating valve is controlled to be closed, and the discharge capacity of the engine oil pump is unchanged; when the pressure of the main oil duct is high, the variable adjustment is needed, the variable adjustment valve is controlled to be opened, and part of lubricating oil of the main oil duct flows into the variable adjustment port of the oil pump, so that the lubricating oil flows into the oil pump, and the displacement of the oil pump is reduced. The variable adjustment of the oil pump is realized by feeding back part of lubricating oil of the main oil duct to the oil pump, the oil pressure of the main oil duct is controlled more accurately, the condition of high oil consumption caused by overhigh pressure of the main oil duct is avoided, the minimum power consumption of the oil pump is realized, the economy of an engine is effectively improved, and the energy conservation and emission reduction are realized.

In an alternative embodiment, the variable regulating valve comprises a first regulating valve and a second regulating valve, the first regulating valve is provided with an oil inlet, a first oil outlet and a second oil outlet, the second regulating valve is provided with an oil inlet and an oil outlet, the first oil outlet is communicated with the variable regulating port, the oil inlet of the second regulating valve is communicated with the second oil outlet, and the oil outlet of the second regulating valve is communicated with the variable regulating port.

The beneficial effects are that: when the current oil pressure of the main oil duct meets a first preset oil pressure condition corresponding to the current rotating speed, namely the current oil pressure meets the requirement, the discharge capacity of the engine oil pump is not required to be regulated at the moment, and the first regulating valve and the second regulating valve of the variable regulating valve are controlled to be closed; when the current oil pressure of the main oil duct meets a second preset oil pressure condition corresponding to the current rotating speed, namely the current oil pressure is high, the displacement of the engine oil pump is required to be regulated at the moment, a first regulating valve of a variable regulating valve is controlled to be opened, part of lubricating oil of the main oil duct flows into the engine oil pump through an oil inlet, a first oil outlet and a variable regulating port of the first regulating valve, the lubricating oil pushes an eccentric rotor to move, the eccentric amount of the eccentric rotor is increased, and the displacement of the engine oil pump is further reduced; when the current oil pressure meets a third preset oil pressure condition corresponding to the current rotating speed, namely, the current oil pressure is too high, the displacement of the engine oil pump is required to be regulated at the moment, the first regulating valve and the second regulating valve of the control variable regulating valve are opened, the first regulating valve is connected with two paths of oil channels, no valve is arranged on one path of oil channel, the second regulating valve is arranged on the other path of oil channel, at the moment, part of lubricating oil of the main oil channel is divided into two paths and then is converged, the converged lubricating oil flows into the engine oil pump, at the moment, the oil pressure flowing into the variable regulating port is high, the eccentric amount is large, the displacement of the engine oil pump is small, and the oil pressure of the main oil channel can be quickly changed.

In an alternative embodiment, the first regulating valve and the second regulating valve are both normally closed valves.

The beneficial effects are that: when the pressure of the main oil duct is not high, the first regulating valve and the second regulating valve do not need to be regulated; when the pressure of the main oil duct is high, the first regulating valve and the second regulating valve are required to be regulated at the moment, so that the control process is simplified.

In an alternative embodiment, the engine lubrication system further comprises a piston cooling oil passage and a third regulating valve, the piston cooling oil passage is communicated with an oil outlet of the oil pump through the third regulating valve, and the controller is used for controlling the opening degree of the third regulating valve according to the power and the rotating speed of the engine.

The beneficial effects are that: when the engine is running, if the temperature of the piston is low, the piston does not need to be cooled; if the temperature of the piston is higher, the piston needs to be cooled at the moment, the third regulating valve is controlled to be opened, and lubricating oil can flow into the cooling oil duct of the piston to cool the piston. The temperature of the piston is related to the power and the rotating speed of the engine, and the opening of the third regulating valve is controlled according to the power and the rotating speed of the engine, so that the piston is cooled accurately.

In an alternative embodiment, the engine lubrication system further comprises a thermostat, an oil cooler and a temperature detecting member, the thermostat is provided with an oil inlet, a first oil outlet and a second oil outlet, the temperature detecting member is suitable for detecting the oil temperature of the main oil duct, the oil inlet of the thermostat is communicated with the oil outlet of the oil pump, the first oil outlet of the thermostat is communicated with the main oil duct, the second oil outlet of the thermostat is communicated with the oil inlet of the oil cooler, the oil outlet of the oil cooler is communicated with the main oil duct, the thermostat is provided with a first working state enabling the oil inlet of the thermostat to be communicated with the first oil outlet and a second working state enabling the oil inlet of the thermostat to be communicated with the second oil outlet, and the controller is suitable for controlling the working state of the thermostat according to the oil temperature detected by the temperature detecting member.

The beneficial effects are that: when the oil temperature of the main oil duct is greater than or equal to the preset oil temperature, the temperature of the main oil duct is too high, the lubricating oil is required to be cooled, the thermostat is controlled to be in a second working state, the lubricating oil flowing out of the thermostat flows into the oil cooler for cooling, and the lubricating oil flows into the main oil duct after cooling; when the oil temperature of the main oil duct is smaller than the preset oil temperature, the thermostat is controlled to be in a first working state, lubricating oil flowing out of the thermostat directly flows into the main oil duct without passing through the oil cooler, and when the engine is started in a cold mode, the temperature of the lubricating oil can be quickly increased to the working temperature, and the time of the engine is shortened.

In an alternative embodiment, the engine lubrication system further comprises a first bypass valve having an oil inlet, a first oil outlet and a second oil outlet, the oil inlet of the first bypass valve being in communication with the second oil outlet of the thermostat, the first oil outlet of the first bypass valve being in communication with the oil inlet of the oil cooler, the second oil outlet of the first bypass valve being in communication with the main oil gallery, the first bypass valve having a first operating state in which its oil inlet is in communication with the first oil outlet and a second operating state in which its oil inlet is in communication with the second oil outlet.

The beneficial effects are that: the arrangement of the first bypass valve can ensure that lubricating oil can normally flow into the main oil duct when the oil cooler is blocked, so that the effect of protecting the safety of the engine is achieved.

In an alternative embodiment, the engine lubrication system further comprises an oil filter and a second bypass valve, the second bypass valve has an oil inlet, a first oil outlet and a second oil outlet, the oil inlet of the second bypass valve is communicated with the oil outlet of the oil cooler, the second oil outlet of the first bypass valve and the first oil outlet of the thermostat, the first oil outlet of the second bypass valve is communicated with the oil inlet of the oil filter, the oil outlet of the oil filter is communicated with the main oil duct, the second oil outlet of the second bypass valve is communicated with the main oil duct, and the second bypass valve has a first working state in which the oil inlet of the second bypass valve is communicated with the first oil outlet and a second working state in which the oil inlet of the second bypass valve is communicated with the second oil outlet.

The beneficial effects are that: the oil filter can filter lubricating oil, and prevents impurities from flowing into the kinematic pair to increase the abrasion condition of the kinematic pair. The second bypass valve has the function that after the filter element is blocked, lubricating oil directly enters all kinematic pairs of the engine without passing through the oil filter, so that the engine safety is protected.

In a second aspect, the present invention further provides an engine lubrication control method, which is applied to the engine lubrication system, and the engine lubrication control method includes the following steps: acquiring the current rotating speed of an engine and the current oil pressure of a main oil duct; and controlling whether the variable regulating valve acts according to the current rotating speed and the current oil pressure.

In an alternative embodiment, in the step of controlling whether the variable adjustment valve is operated according to the current rotation speed and the current oil pressure, whether the variable adjustment valve is operated is controlled based on a relation between the current oil pressure and a preset oil pressure condition corresponding to the current rotation speed.

The beneficial effects are that: under the condition that the rotating speeds of the engines are different, the oil pressure of the main oil duct is also different, whether the variable regulating valve acts or not is controlled according to the relation between the current oil pressure and the preset oil pressure condition corresponding to the current rotating speed, and the control is more accurate.

In an alternative embodiment, the step of controlling whether the variable adjustment valve is operated based on a relation between the current oil pressure and a preset oil pressure condition corresponding to the current rotation speed includes: when the current oil pressure meets a first preset oil pressure condition corresponding to the current rotating speed, a first regulating valve and a second regulating valve of the variable regulating valve are controlled to be closed; when the current oil pressure meets a second preset oil pressure condition corresponding to the current rotating speed, the first regulating valve is controlled to be opened; and when the current oil pressure meets a third preset oil pressure condition corresponding to the current rotating speed, controlling the first regulating valve and the second regulating valve to be opened.

The beneficial effects are that: when the current oil pressure meets different oil pressure conditions, variable adjustment is realized according to the fed back oil pressure, energy saving of an oil pump is realized, an engine works in an optimal state, and energy saving and consumption reduction of the engine are realized.

In an alternative embodiment, the engine lubrication control method further comprises the steps of: acquiring the current power of an engine; and controlling whether the third regulating valve acts or not based on the relation between the current power and the preset power corresponding to the current rotating speed and the relation between the current rotating speed and the preset rotating speed.

The beneficial effects are that: the temperature of the piston is related to the power and the rotating speed of the engine, and the opening of the third regulating valve is controlled according to the power and the rotating speed of the engine, so that the piston is cooled accurately.

In an alternative embodiment, the step of controlling whether the third regulating valve acts based on a relationship between the current power and the preset power corresponding to the current rotation speed and a relationship between the current rotation speed and the preset rotation speed includes: judging whether the current power is less than 10% of the preset power corresponding to the current rotating speed and whether the current rotating speed is less than 2/3 of the preset rotating speed; determining that the current power is less than 10% of the preset power corresponding to the current rotating speed and the current rotating speed is less than 2/3 of the preset rotating speed, and controlling the third regulating valve to be closed; determining that the current power is greater than or equal to 10% of the preset power corresponding to the current rotating speed and the current rotating speed is less than 2/3 of the preset rotating speed, and judging whether the current power is less than or equal to 50% of the preset power corresponding to the current rotating speed; determining that the current power is less than or equal to 50% of the preset power corresponding to the current rotating speed, and controlling the third regulating valve to be opened until the opening of the third regulating valve is half of the full opening; and determining that the current power is greater than 50% of the preset power corresponding to the current rotating speed and/or the current rotating speed is greater than or equal to 2/3 of the preset rotating speed, and controlling the third regulating valve to be opened until the opening degree of the third regulating valve is full-opened.

In an alternative embodiment, the engine lubrication control method further comprises the steps of: acquiring the current oil temperature of a main oil duct; and controlling the working state of the thermostat based on the relation between the current oil temperature and the preset oil temperature.

The beneficial effects are that: the state of the thermostat is controlled according to the oil temperature of the main oil duct, so that the condition that the temperature of lubricating oil of the main oil duct is too high can be avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an engine lubrication system according to an embodiment of the present invention;

FIG. 2 is a flow chart of an engine lubrication control method according to an embodiment of the present invention;

FIG. 3 is a flow chart of flow control of an engine lubrication control method according to an embodiment of the present invention;

FIG. 4 is a flow chart of flow control of an engine lubrication control method according to an embodiment of the present invention;

Fig. 5 is a schematic flow chart of temperature control of an engine lubrication control method according to an embodiment of the present invention.

Reference numerals illustrate:

1. an oil tank; 2. an oil pump; 3. a main oil duct; 5. a pressure detecting member; 6. an engine controller; 7. a first regulating valve; 8. a second regulating valve; 9. a piston cooling gallery; 10. a third regulating valve; 11. a thermostat; 12. an oil cooler; 13. a temperature detecting member; 14. a first bypass valve; 15. an oil filter; 16. a second bypass valve; 17. a one-way valve; 18. a safety valve; 19. rotor filtering; 20. an oil drain valve; 21. and a kinematic pair.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

An embodiment of the present invention is described below with reference to fig. 1.

According to an embodiment of the present invention, in one aspect, there is provided an engine lubrication system including: the oil pump 2 is provided with an oil inlet, an oil outlet and a variable regulating port, and the oil inlet of the oil pump 2 is communicated with the oil tank 1; the main oil duct 3 is communicated with an oil outlet of the oil pump 2 and is suitable for being arranged on an engine; the variable regulating valve is communicated with the main oil duct 3 and the variable regulating port; the rotation speed detection piece is suitable for detecting the rotation speed of the engine; the pressure detecting member 5 is adapted to detect the oil pressure of the main oil passage 3; the controller is electrically connected with the variable regulating valve, the rotating speed detecting piece and the pressure detecting piece 5, and is used for controlling whether the variable regulating valve acts according to the rotating speed detected by the rotating speed detecting piece and the oil pressure detected by the pressure detecting piece 5.

By applying the engine lubrication system of the embodiment, the oil pressure of the main oil duct 3 and the rotation speed of the engine are detected through the pressure detection piece 5, the detected oil pressure signal and the rotation speed signal detected by the pressure detection piece 5 are sent to the controller, the controller controls whether the variable regulating valve acts according to the current rotation speed signal of the engine and the current oil pressure signal of the main oil duct 3, when the pressure of the main oil duct 3 is not high, variable regulation is not needed, the variable regulating valve is controlled to be closed, and the displacement of the oil pump 2 is unchanged; when the pressure of the main oil duct 3 is high, variable adjustment is needed, the variable adjustment valve is controlled to be opened, part of lubricating oil of the main oil duct 3 flows into a variable adjustment port of the oil pump 2, and then flows into the oil pump 2, so that the displacement of the oil pump 2 is reduced. The variable adjustment of the oil pump 2 is realized through feeding back part of lubricating oil of the main oil duct 3 to the oil pump 2, the oil pressure of the main oil duct 3 is controlled more accurately, the condition that the oil consumption is high due to the fact that the pressure of the main oil duct 3 is too high is avoided, the minimum power consumption of the oil pump 2 is realized, the economy of an engine is effectively improved, and energy conservation and emission reduction are realized.

The oil pump 2 is a variable displacement oil pump, the lubricating oil flows into the oil pump 2 through the variable adjustment port, the lubricating oil can push the eccentric rotor to move, and further the eccentric amount of the eccentric rotor can be changed, the higher the oil pressure flowing into the variable adjustment port is, the larger the eccentric amount is, the smaller the displacement of the oil pump 2 is, otherwise, the lower the oil pressure flowing into the variable adjustment port is, the smaller the eccentric amount is, and the larger the displacement of the oil pump 2 is. The specific structure of the variable displacement oil pump is only required to be a structure in the prior art, and detailed description is omitted here.

In one embodiment, the variable regulating valve comprises a first regulating valve 7 and a second regulating valve 8, the first regulating valve 7 is provided with an oil inlet, a first oil outlet and a second oil outlet, the second regulating valve 8 is provided with an oil inlet and an oil outlet, the first oil outlet is communicated with the variable regulating port, the oil inlet of the second regulating valve 8 is communicated with the second oil outlet, and the oil outlet of the second regulating valve 8 is communicated with the variable regulating port. When the current oil pressure of the main oil duct meets a first preset oil pressure condition corresponding to the current rotating speed, namely the current oil pressure meets the requirement, the discharge capacity of the engine oil pump is not required to be regulated at the moment, and the first regulating valve 7 and the second regulating valve 8 of the variable regulating valve are controlled to be closed; when the current oil pressure of the main oil duct meets a second preset oil pressure condition corresponding to the current rotating speed, namely the current oil pressure is high, the displacement of the engine oil pump is required to be regulated at the moment, the first regulating valve 7 of the variable regulating valve is controlled to be opened, part of lubricating oil of the main oil duct flows into the engine oil pump through the oil inlet, the first oil outlet and the variable regulating port of the first regulating valve 7, the lubricating oil pushes the eccentric rotor to move, the eccentric amount of the eccentric rotor is increased, and the displacement of the engine oil pump is reduced; when the current oil pressure meets a third preset oil pressure condition corresponding to the current rotating speed, namely, the current oil pressure is too high, the displacement of the engine oil pump is required to be regulated at the moment, the first regulating valve 7 and the second regulating valve 8 of the control variable regulating valve are opened, the first regulating valve 7 is connected with two paths of oil channels, no valve is arranged on one path of oil channel, the second regulating valve 8 is arranged on the other path of oil channel, at the moment, part of lubricating oil of the main oil channel is divided into two paths and then is converged, and the two paths of lubricating oil flow into the engine oil pump after being converged, at the moment, the oil pressure flowing into the variable regulating port is high, the eccentric quantity is large, so that the displacement of the engine oil pump 2 is small, and the oil pressure of the main oil channel can be quickly changed.

In another embodiment, only one adjusting valve may be provided, and the displacement of the oil pump 2 may be adjusted by the opening of the one adjusting valve, wherein the larger the opening of the adjusting valve is, the smaller the displacement of the oil pump 2 is.

In one embodiment, the first regulating valve 7 and the second regulating valve 8 are normally closed valves, and when the pressure of the main oil duct 3 is not high, the first regulating valve 7 and the second regulating valve 8 do not need to be regulated; when the pressure of the main oil gallery 3 is high, the first regulating valve 7 and the second regulating valve 8 need to be regulated at this time, so that the control process is simplified.

In another embodiment, the first regulating valve 7 and the second regulating valve 8 are both normally open valves or the like.

In one embodiment, the first regulating valve 7 is an electromagnetic valve, the electromagnetic valve is in a normally closed state when the electromagnetic valve is not electrified, and is in an open state when the electromagnetic valve is electrified, so that the electromagnetic valve has the advantages of high response speed, high reliability, high control precision, long service life and the like, and the state of the electromagnetic valve can be controlled only by controlling whether the electromagnetic valve is electrified or not, and the control is simpler. The second regulating valve 8 is a mechanical valve or the like.

In another embodiment, the first regulating valve 7 and the second regulating valve 8 may be pneumatic valves or hydraulic valves.

In one embodiment, the engine lubrication system further comprises a piston cooling oil passage 9 and a third regulating valve 10, the piston cooling oil passage 9 is communicated with an oil outlet of the oil pump 2 through the third regulating valve 10, and the controller is used for controlling the opening degree of the third regulating valve 10 according to the power and the rotating speed of the engine. When the engine is running, if the temperature of the piston is low, the piston does not need to be cooled; if the temperature of the piston is high, the piston needs to be cooled at this time, the third regulating valve 10 is controlled to be opened, and lubricating oil can flow into the piston cooling oil passage 9 to cool the piston. The temperature of the piston is related to the power and the rotating speed of the engine, and the opening degree of the third regulating valve 10 is controlled according to the power and the rotating speed of the engine, so that the accurate cooling of the piston is realized.

In one embodiment, the engine lubrication system further comprises a thermostat 11, an oil cooler 12 and a temperature detecting member 13, the thermostat 11 has an oil inlet, a first oil outlet and a second oil outlet, the temperature detecting member 13 is adapted to detect the oil temperature of the main oil duct 3, the oil inlet of the thermostat 11 is communicated with the oil outlet of the oil pump 2, the first oil outlet of the thermostat 11 is communicated with the main oil duct 3, the second oil outlet of the thermostat 11 is communicated with the oil inlet of the oil cooler 12, the oil outlet of the oil cooler 12 is communicated with the main oil duct 3, the thermostat 11 has a first working state in which the oil inlet thereof is communicated with the first oil outlet and a second working state in which the oil inlet thereof is communicated with the second oil outlet, and the controller is adapted to control the working state of the thermostat 11 according to the oil temperature detected by the temperature detecting member 13. When the oil temperature of the main oil duct 3 is greater than or equal to the preset oil temperature, the temperature of the main oil duct 3 is too high, the lubricating oil is required to be cooled, the thermostat 11 is controlled to be in a second working state, the lubricating oil flowing out of the thermostat 11 flows into the oil cooler 12 for cooling, and the lubricating oil flows into the main oil duct 3 after cooling; when the oil temperature of the main oil duct 3 is smaller than the preset oil temperature, the thermostat 11 is controlled to be in a first working state, lubricating oil flowing out of the thermostat 11 directly flows into the main oil duct 3 without passing through the oil cooler 12, and the temperature of the lubricating oil can be quickly increased to the working temperature during cold start, so that the time of a heat engine is shortened. Wherein the preset oil temperature is, for example, 100 ℃.

Further, the thermostat 11 is specifically an electric control thermostat, the electric control thermostat is provided with an electromagnetic valve, and when the oil temperature of the main oil duct 3 is smaller than a preset oil temperature, the electromagnetic valve is not electrified and is in a first working state; when the oil temperature of the main oil duct 3 is greater than or equal to the preset oil temperature, the electromagnetic valve is electrified, and the electromagnetic valve is switched from the first working state to the second working state. The specific structure of the electric control thermostat is only required to be adopted in the prior art, and detailed description is omitted here.

In one embodiment, the engine lubrication system further includes a first bypass valve 14, the first bypass valve 14 having an oil inlet, a first oil outlet, and a second oil outlet, the oil inlet of the first bypass valve 14 communicating with the second oil outlet of the thermostat 11, the first oil outlet of the first bypass valve 14 communicating with the oil inlet of the oil cooler 12, the second oil outlet of the first bypass valve 14 communicating with the main oil gallery 3, the first bypass valve 14 having a first operating state in which its oil inlet communicates with the first oil outlet, and a second operating state in which its oil inlet communicates with the second oil outlet. If the pressure difference between the front and rear of the oil cooler 12 is not large, for example, the pressure difference between the front and rear of the oil cooler 12 is 2.5bar or less, the first bypass valve 14 is in the first operating state, and the lubricating oil can normally pass through the oil cooler 12; if the pressure difference across the oil cooler 12 is too great, indicating that a blockage has occurred in the oil cooler 12, the first bypass valve 14 switches from the first operating state to the second operating state, and lubricating oil directly enters the main oil gallery 3 without passing through the oil cooler 12. The arrangement of the first bypass valve 14 can ensure that lubricating oil can normally flow into the main oil duct 3 when the oil cooler 12 is blocked, so that the safety of the engine is protected.

In one embodiment, the engine lubrication system further includes an oil filter 15 and a second bypass valve 16, the second bypass valve 16 having an oil inlet, a first oil outlet, and a second oil outlet, the oil inlet of the second bypass valve 16 being in communication with the oil outlet of the oil cooler 12, the second oil outlet of the first bypass valve 14, the first oil outlet of the thermostat 11, the first oil outlet of the second bypass valve 16 being in communication with the oil inlet of the oil filter 15, the oil outlet of the oil filter 15 being in communication with the main oil gallery 3, the second oil outlet of the second bypass valve 16 being in communication with the main oil gallery 3, the second bypass valve 16 having a first operating state in which its oil inlet is in communication with the first oil outlet, and a second operating state in which its oil inlet is in communication with the second oil outlet. The oil filter 15 can filter the lubricating oil to prevent the foreign matter from flowing into the kinematic pair 21 and increasing the wear of the kinematic pair 21. If the pressure difference between the front and rear of the oil filter 15 is not large, for example, the pressure difference between the front and rear of the oil filter 15 is less than or equal to 2.5bar, the second bypass valve 16 is in the first working state, and the lubricating oil can normally pass through the oil filter 15; if the pressure difference between the front and rear of the oil filter 15 is too large, which indicates that the oil filter 15 is blocked, the second bypass valve 16 is switched from the first operating state to the second operating state, and the lubricating oil directly enters the main oil gallery 3 without passing through the oil filter 15, and then flows into each kinematic pair 21. The second bypass valve 16 has the function of protecting the engine by directly entering the lubricating oil into each kinematic pair 21 of the engine without passing through the oil filter 15 after the filter element is blocked.

When the pressure difference between the front and rear of the oil cooler 12 and the pressure difference between the front and rear of the oil filter 15 are greater than 2.5bar, the first bypass valve 14 and the second bypass valve 16 may be automatically switched from the first operating state to the second operating state, and the bypass valve is not required to be controlled by the controller, for example, when the pressure of the lubricating oil at the oil inlet of the oil cooler 12 and the oil filter 15 is relatively high, the lubricating oil may push the valve cores in the first bypass valve 14 and the second bypass valve 16 to move, so that the first bypass valve 14 and the second bypass valve 16 are switched from the first operating state to the second operating state, and the detection of the oil pressure and the control of the bypass valve are not required, thereby simplifying the overall structure. The specific structures of the first bypass valve 14 and the second bypass valve 16 are all the structures in the prior art, and will not be described in detail herein.

In one embodiment, the oil tank 1 is embodied as an oil pan, which is a lower half of a crankcase, for collecting and storing lubricating oil flowing back from the surfaces of the respective kinematic pairs 21 of the engine, and for dissipating part of the heat to prevent oxidation of the lubricating oil.

In one embodiment, the pressure detecting member 5 is a pressure sensor, and the rotating speed detecting member is a rotating speed sensor, and the temperature detecting member 13 is a temperature sensor, and the sensor has the advantages of fast dynamic response, high signal-to-noise ratio, stable system, and the like.

In one embodiment, the engine lubrication system further comprises a one-way valve 17, a safety valve 18, a rotor filter 19, an oil drain valve 20 and the like, wherein an oil inlet of the one-way valve 17 is communicated with an oil outlet of the oil pump 2, an oil outlet of the one-way valve 17 is communicated with an oil inlet of the thermostat 11, an oil inlet of the safety valve 18 is communicated with an oil outlet of the oil pump 2, an oil outlet of the safety valve 18 is communicated with an oil pan, an oil inlet of the rotor filter 19 is communicated with a first oil outlet of the second bypass valve 16, an oil outlet of the rotor filter 19 is communicated with the oil pan, an oil inlet of the oil drain valve 20 is communicated with an oil drain port of the oil filter 15, and an oil outlet of the oil drain valve 20 is communicated with the oil pan.

Specifically, the check valve 17 allows the lubrication oil to flow from the side of the oil pump 2 to the oil cooler 12 only, avoiding the backflow of the lubrication oil of the lubrication system to the oil pan after the engine is stopped. When the engine works, the oil pump 2 pumps the lubricating oil of the oil pan into the engine at high pressure, after the high-pressure lubricating oil passes through the oil pump 2, if the oil pressure after the pumping is too high, for example, the oil pressure discharged by the oil outlet of the oil pump 2 is more than 11bar, in order to ensure the safety of a lubricating system, the safety valve 18 is opened at the moment, and part of the lubricating oil leaks back to the oil pan to regulate the pressure of the lubricating system. When oil drain is required, the oil drain valve 20 is opened, and the lubricating oil flowing out from the oil drain port of the oil filter 15 flows into the oil pan through the oil drain valve 20.

It should be noted that, the rotor filter 19 may also be called a centrifugal oil filter, and the rotor filter 19 may filter out particles having a diameter less than 10 micrometers, which cannot be intercepted by a common filter, so as to reduce wear of each kinematic pair 21 of the engine. The controller is in particular an engine controller 6.

The following describes the operation of the engine lubrication system:

when the engine works, the oil pump 2 pumps the lubricating oil of the oil pan into the engine at high pressure, and after the high-pressure lubricating oil passes through the oil pump 2, if the pressure after the pumping is too high, in order to ensure the safety of a lubricating system, the safety valve 18 is opened at the moment, and part of the leaked lubricating oil returns to the oil pan to regulate the pressure of the lubricating system.

The lubricating oil flows into the one-way valve 17 after passing through the oil pump 2, and the one-way valve 17 enables the lubricating oil to flow to the thermostat 11 only from one side of the oil pump 2, so that the oil of the lubricating system is prevented from flowing back to the oil pan after the engine is stopped.

The lubricating oil flowing out from the oil outlet of the check valve 17 flows into the thermostat 11, when the temperature of the lubricating oil of the engine is less than 100 ℃, the electromagnetic valve of the thermostat 11 is in the first working state, and the lubricating oil does not pass through the oil cooler 12 but directly flows into the second bypass valve 16 in front of the oil filter 15, so that the temperature of the lubricating oil is quickly raised to the working temperature during cold start, and the heat engine time is reduced. When the temperature of the lubricating oil of the engine is more than or equal to 100 ℃, the electromagnetic valve of the thermostat 11 is in a second working state, the lubricating oil flows into the first bypass valve 14 after passing through the thermostat 11, the pressure difference before and after the oil cooler 12 is monitored, if the pressure difference before and after the oil cooler 12 is overlarge, for example, the pressure difference before and after the oil cooler 12 is more than 2.5bar, the oil cooler 12 is blocked at the moment, the first bypass valve 14 is switched from the first working state to the second working state under the action of the lubricating oil, and the lubricating oil directly enters the second bypass valve 16 before the oil filter 15; if the pressure differential is less than the set point, the oil normally passes through the oil cooler 12.

The lubricating oil passing through the oil cooler 12 flows into the second bypass valve 16 before the oil filter 15, and the bypass valve has the function of protecting the engine by directly entering each kinematic pair 21 of the engine without passing through the oil filter 15 after the filter element is blocked.

The lubrication oil passing through the oil filter 15 is split into two paths:

one path enters a main oil duct 3 of the engine, the main oil duct 3 is connected with a variable regulating oil duct, a first regulating valve 7 and a second regulating valve 8 are arranged on the variable regulating oil duct, a sensor for detecting the oil pressure and the oil temperature of the main oil duct 3 sends detected data to an engine controller 6, whether the first regulating valve 7 and the second regulating valve 8 act or not is controlled by the engine controller 6, the variable regulating oil duct is provided with two paths of branch regulating oil ducts behind the first regulating valve 7, and the two paths of branch regulating oil ducts are collected in a certain place and fed back to an oil pump 2 after being collected so as to regulate the flow of the oil pump 2;

the other path of the lubricating oil passes through the third regulating valve 10 and then enters the piston cooling oil duct 9 of the engine, the third regulating valve 10 of the path receives an instruction of the engine controller 6 to determine the opening degree of the third regulating valve 10 so as to determine the flow and the pressure of the lubricating oil entering the piston cooling oil duct 9, so that the requirement of piston cooling is met, and the instruction of the engine controller 6 is influenced by factors such as the rotating speed, the load and the like of the engine.

In fig. 1, a broken line indicates an oil passage that flows back to the oil pan, a solid line indicates an oil passage that flows from the oil pan into each of the pair of motion of the engine and the piston cooling oil passage, and a chain line indicates an electric circuit.

According to an embodiment of the present invention, in another aspect, there is also provided an engine lubrication control method applied to the above engine lubrication system, as shown in fig. 2, the engine lubrication control method including the steps of:

acquiring the current rotating speed of the engine and the current oil pressure of the main oil duct 3;

and controlling whether the variable regulating valve acts according to the current rotating speed and the current oil pressure.

Whether the variable regulating valve acts or not is controlled according to the current rotating speed signal of the engine and the current oil pressure signal of the main oil duct 3, when the pressure of the main oil duct 3 is not high, variable regulation is not needed, the variable regulating valve is controlled to be closed, and the displacement of the oil pump 2 is unchanged; when the pressure of the main oil duct 3 is high, variable adjustment is needed, the variable adjustment valve is controlled to be opened, part of lubricating oil of the main oil duct 3 flows into a variable adjustment port of the oil pump 2, and then flows into the oil pump 2, so that the displacement of the oil pump 2 is reduced. The variable adjustment of the oil pump 2 is realized through feeding back part of lubricating oil of the main oil duct 3 to the oil pump 2, the oil pressure of the main oil duct 3 is controlled more accurately, the condition that the oil consumption is high due to the fact that the pressure of the main oil duct 3 is too high is avoided, the minimum power consumption of the oil pump 2 is realized, the economy of an engine is effectively improved, and energy conservation and emission reduction are realized.

In one embodiment, in the step of controlling whether the variable adjustment valve is operated according to the current rotation speed and the current oil pressure, whether the variable adjustment valve is operated is controlled based on a relation between the current oil pressure and a preset oil pressure condition corresponding to the current rotation speed. Under the condition that the rotating speeds of the engines are different, the oil pressure of the main oil duct 3 is also different, whether the variable regulating valve acts or not is controlled according to the relation between the current oil pressure and the preset oil pressure condition corresponding to the current rotating speed, and the control is more accurate.

In one embodiment, as shown in fig. 3, the step of controlling whether the variable adjustment valve is operated based on the relationship between the current oil pressure and the preset oil pressure condition corresponding to the current rotation speed includes:

when the current oil pressure meets a first preset oil pressure condition corresponding to the current rotating speed, the first regulating valve 7 and the second regulating valve 8 of the variable regulating valve are controlled to be closed; the first preset oil pressure condition refers to the pressure that the current oil pressure meets the requirement under the current rotating speed.

When the current oil pressure meets a second preset oil pressure condition corresponding to the current rotating speed, the first regulating valve 7 is controlled to be opened; the second preset oil pressure condition refers to the pressure that the current oil pressure exceeds the demand by a small amount at the current rotating speed.

When the current oil pressure meets a third preset oil pressure condition corresponding to the current rotating speed, the first regulating valve 7 and the second regulating valve 8 are controlled to be opened. The third preset oil pressure condition refers to that the current oil pressure exceeds the excessive pressure required at the current rotating speed.

When the current oil pressure meets different oil pressure conditions, variable adjustment is realized according to the fed back oil pressure, so that the oil pump 2 can save energy, the engine can work in an optimal state, and the energy saving and consumption reduction of the engine can be realized.

Further, the first preset oil pressure condition may be a preset oil pressure value corresponding to the current rotation speed, or may be a preset oil pressure range. The second preset oil pressure condition and the third preset oil pressure condition are preset oil pressure ranges corresponding to the current rotating speed. The correspondence between the rotation speed and the oil pressure can be seen in table 1 below.

TABLE 1

The first preset oil pressure condition, the second preset oil pressure condition, and the third preset oil pressure condition are described below with reference to table 1:

when the current rotating speed is 900r/min, the first preset oil pressure condition is 2.2bar, the second preset oil pressure condition is more than 2.2bar and less than 4.5bar, the third preset oil pressure condition is more than or equal to 4.5bar, and if the current oil pressure is less than 2.2bar at the moment, the controller controls the alarm component to alarm.

When the current rotating speed is greater than 900r/min and less than 1000r/min, the first preset oil pressure condition is greater than 2.2bar and less than 2.4bar, the second preset oil pressure condition is greater than or equal to 2.4bar and less than 4.5bar, the third preset oil pressure condition is greater than or equal to 4.5bar, and if the current oil pressure is less than 2.2bar at the moment, the controller controls the alarm part to alarm.

When the current rotating speed is greater than or equal to 1500r/min, the first preset oil pressure condition is 4bar, the second preset oil pressure condition is greater than 4bar and less than 4.5bar, the third preset oil pressure condition is greater than or equal to 4.5bar, and if the current oil pressure is less than 4bar at the moment, the controller controls the alarm part to alarm.

It should be noted that, in the second preset condition, the larger end point value is 4.5bar, the smaller end point value is determined according to the table, and the third preset oil pressure condition is 4.5bar or more at different rotation speeds.

It will be appreciated that the above data are merely illustrative, and the preset oil pressure condition corresponding to the rotation speed may be determined according to the specific situation.

In one embodiment, the engine lubrication control method further includes the steps of:

acquiring the current power of an engine;

whether the third regulating valve 10 is operated is controlled based on the relationship between the current power and the preset power corresponding to the current rotation speed and the relationship between the current rotation speed and the preset rotation speed.

The temperature of the piston is related to the power and the rotating speed of the engine, and the opening degree of the third regulating valve 10 is controlled according to the power and the rotating speed of the engine, so that the accurate cooling of the piston is realized.

It should be noted that, the preset power corresponding to the current rotation speed refers to the maximum power value of the engine at the current rotation speed. The preset rotational speed refers to a maximum rotational speed value at the maximum power of the engine.

Specifically, as shown in fig. 4, the step of controlling whether the third regulating valve 10 is operated based on the relationship between the current power and the preset power corresponding to the current rotation speed and the relationship between the current rotation speed and the preset rotation speed includes:

judging whether the current power is less than 10% of the preset power corresponding to the current rotating speed and whether the current rotating speed is less than 2/3 of the preset rotating speed;

determining that the current power is less than 10% of the preset power corresponding to the current rotating speed and the current rotating speed is less than 2/3 of the preset rotating speed, and controlling the third regulating valve 10 to be closed;

determining that the current power is greater than or equal to 10% of the preset power corresponding to the current rotating speed and the current rotating speed is less than 2/3 of the preset rotating speed, and judging whether the current power is less than or equal to 50% of the preset power corresponding to the current rotating speed;

determining that the current power is less than or equal to 50% of the preset power corresponding to the current rotating speed, and controlling the third regulating valve 10 to be opened until the opening of the third regulating valve is half of the full opening;

and determining that the current power is greater than 50% of the preset power corresponding to the current rotating speed and/or the current rotating speed is greater than or equal to 2/3 of the preset rotating speed, and controlling the third regulating valve 10 to be opened until the opening degree is full.

In one embodiment, the engine lubrication control method further includes the steps of:

Acquiring the current oil temperature of the main oil duct 3;

the operating state of the thermostat 11 is controlled based on the relationship between the current oil temperature and the preset oil temperature.

The condition of the thermostat 11 is controlled according to the oil temperature of the main oil passage 3, so that the condition that the temperature of the lubricating oil of the main oil passage is too high can be avoided.

Specifically, as shown in fig. 5, when the oil temperature of the main oil gallery 3 is greater than or equal to the preset oil temperature, the temperature of the main oil gallery 3 is too high, the lubricating oil needs to be cooled, the thermostat 11 is controlled to be in a second working state, and the lubricating oil flowing out of the thermostat 11 flows into the oil cooler 12 for cooling, and flows into the main oil gallery 3 after cooling; when the oil temperature of the main oil duct 3 is smaller than the preset oil temperature, the thermostat 11 is controlled to be in a first working state, lubricating oil flowing out of the thermostat 11 directly flows into the main oil duct 3 without passing through the oil cooler 12, and the temperature of the lubricating oil can be quickly increased to the working temperature during cold start, so that the time of a heat engine is shortened. Wherein the preset oil temperature is, for example, 100 ℃.

In one embodiment, the engine lubrication control method further includes the steps of:

acquiring an actual oil pressure at a position flowing out from an oil outlet of the oil pump 2;

based on the relation between the actual oil pressure and the preset lubricating oil pressure, a relief valve 18 communicating with the oil outlet of the oil pump 2 and the oil tank 1 is controlled to be opened.

When the engine works, the oil pump 2 pumps the lubricating oil of the oil pan into the engine at high pressure, after the high-pressure lubricating oil passes through the oil pump 2, if the oil pressure after the pumping is too high, for example, the oil pressure discharged from the oil outlet of the oil pump 2 is more than 11bar, in order to ensure the safety of a lubricating system, the safety valve 18 is opened at the moment, and the leaked part of the lubricating oil returns to the oil pan to regulate the pressure of the lubricating system.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

1. and a variable regulating oil way is designed between the main oil duct and the oil pump, the flow of the oil pump is regulated through the pressure of the main oil duct, the variable flow of the engine oil is realized, the oil pressure of the main oil duct 3 is accurately controlled, the condition that the oil consumption is high due to the overhigh pressure of the main oil duct 3 is avoided, the minimum power consumption of the oil pump 2 is realized, the economical efficiency of an engine is effectively improved, and the energy conservation and the emission reduction are realized.

2. Two ways of electric control and mechanical adjustment are designed on the variable adjustment oil path, the electric control adjustment is variable, the mechanical adjustment is variable, the electric control and the mechanical adjustment are simultaneously adjustable, the energy saving of the oil pump 2 is realized, the engine works in an optimal state, and the energy saving and consumption reduction of the engine are realized.

3. The third regulating valve controls whether the lubricating oil flows into the piston cooling oil duct or not, and then controls the opening of the third regulating valve according to the working condition (such as the power and the rotating speed of the engine) of the engine and the instruction of the engine controller, so as to control whether the piston cooling nozzle sprays the lubricating oil to the piston or not, and realize electronic adjustable cooling of the piston.

4. The pressure and the flow of the lubricating oil can be regulated by the arrangement of the three regulating valves.

5. The electronic control thermostat is designed in the whole lubricating system, so that whether lubricating oil passes through an oil cooler or not can be controlled, and the oil temperature of the quick lifter when the engine just works is realized.

6. The whole system is provided with a plurality of bypass valves and safety valves 18, so that the safety of the whole lubrication system can be ensured.

Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims (13)

1. An engine lubrication system, comprising:

an oil tank (1);

the oil pump (2) is provided with an oil inlet, an oil outlet and a variable adjusting port, and the oil inlet of the oil pump (2) is communicated with the oil tank (1);

The main oil duct (3) is communicated with an oil outlet of the oil pump (2) and is suitable for being arranged on an engine;

the variable regulating valve is communicated with the main oil duct (3) and the variable regulating port;

a rotation speed detecting member adapted to detect a rotation speed of the engine;

a pressure detecting member (5) adapted to detect an oil pressure of the main oil passage (3);

and the controller is electrically connected with the variable regulating valve, the rotating speed detecting piece and the pressure detecting piece (5) and is used for controlling whether the variable regulating valve acts or not according to the rotating speed detected by the rotating speed detecting piece and the oil pressure detected by the pressure detecting piece (5).

2. The engine lubrication system according to claim 1, wherein the variable control valve comprises a first control valve (7) and a second control valve (8), the first control valve (7) having an oil inlet, a first oil outlet and a second oil outlet, the second control valve (8) having an oil inlet and an oil outlet, the first oil outlet being in communication with the variable control port, the oil inlet of the second control valve (8) being in communication with the second oil outlet, the oil outlet of the second control valve (8) being in communication with the variable control port.

3. Engine lubrication system according to claim 2, characterized in that the first regulating valve (7) and the second regulating valve (8) are both normally closed valves.

4. An engine lubrication system according to any one of claims 1-3, characterized in that the engine lubrication system further comprises a piston cooling oil passage (9) and a third regulating valve (10), the piston cooling oil passage (9) being in communication with an oil outlet of the oil pump (2) through the third regulating valve (10), the controller being adapted to control the opening of the third regulating valve (10) in dependence on the power and the rotational speed of the engine.

5. -an engine lubrication system according to any one of claims 1 to 3, characterized in that it further comprises a thermostat (11), an oil cooler (12) and a temperature detecting member (13), the thermostat (11) having an oil inlet, a first oil outlet and a second oil outlet, the temperature detecting member (13) being adapted to detect the oil temperature of the main oil gallery (3), the oil inlet of the thermostat (11) being in communication with the oil outlet of the oil pump (2), the first oil outlet of the thermostat (11) being in communication with the main oil gallery (3), the second oil outlet of the thermostat (11) being in communication with the oil inlet of the oil cooler (12), the oil outlet of the oil cooler (12) being in communication with the main oil gallery (3), the thermostat (11) having a first operating state in which it is in communication with the first oil outlet and a second operating state in which it is in communication with the second oil outlet, the controller being adapted to control the operating state of the thermostat (11) depending on the oil temperature detected by the temperature detecting member (13).

6. The engine lubrication system according to claim 5, further comprising a first bypass valve (14), the first bypass valve (14) having an oil inlet, a first oil outlet and a second oil outlet, the oil inlet of the first bypass valve (14) being in communication with the second oil outlet of the thermostat (11), the first oil outlet of the first bypass valve (14) being in communication with the oil inlet of the oil cooler (12), the second oil outlet of the first bypass valve (14) being in communication with the main oil gallery (3), the first bypass valve (14) having a first operating state in which its oil inlet is in communication with the first oil outlet and a second operating state in which its oil inlet is in communication with the second oil outlet.

7. The engine lubrication system according to claim 6, further comprising an oil filter (15) and a second bypass valve (16), the second bypass valve (16) having an oil inlet, a first oil outlet and a second oil outlet, the oil inlet of the second bypass valve (16) being in communication with the oil outlet of the oil cooler (12), the second oil outlet of the first bypass valve (14), the first oil outlet of the thermostat (11), the first oil outlet of the second bypass valve (16) being in communication with the oil inlet of the oil filter (15), the oil outlet of the oil filter (15) being in communication with the main oil gallery (3), the second oil outlet of the second bypass valve (16) being in communication with the main oil gallery (3), the second bypass valve (16) having a first operating state in which its oil inlet is in communication with the first oil outlet and a second operating state in which its oil inlet is in communication with the second oil outlet.

8. An engine lubrication control method, characterized by being applied to the engine lubrication system according to any one of claims 1 to 7, comprising the steps of:

acquiring the current rotating speed of an engine and the current oil pressure of a main oil duct (3);

and controlling whether the variable regulating valve acts or not according to the current rotating speed and the current oil pressure.

9. The engine lubrication control method according to claim 8, wherein in the step of controlling whether the variable adjustment valve is operated according to the current rotation speed and the current oil pressure, whether the variable adjustment valve is operated is controlled based on a relation between the current oil pressure and a preset oil pressure condition corresponding to the current rotation speed.

10. The engine lubrication control method according to claim 9, characterized in that the step of controlling whether the variable adjustment valve is operated based on a relation between the current oil pressure and a preset oil pressure condition corresponding to the current rotation speed includes:

when the current oil pressure meets a first preset oil pressure condition corresponding to the current rotating speed, a first regulating valve (7) and a second regulating valve (8) of the variable regulating valve are controlled to be closed;

When the current oil pressure meets a second preset oil pressure condition corresponding to the current rotating speed, the first regulating valve (7) is controlled to be opened;

and when the current oil pressure meets a third preset oil pressure condition corresponding to the current rotating speed, controlling the first regulating valve (7) and the second regulating valve (8) to be opened.

11. The engine lubrication control method according to any one of claims 8 to 10, characterized in that the engine lubrication control method further includes the steps of:

acquiring the current power of the engine;

and controlling whether the third regulating valve (10) acts or not based on the relation between the current power and the preset power corresponding to the current rotating speed and the relation between the current rotating speed and the preset rotating speed.

12. The engine lubrication control method according to claim 11, characterized in that the step of controlling whether the third regulating valve (10) is operated based on a relation between the current power and a preset power corresponding to the current rotation speed and a relation between the current rotation speed and a preset rotation speed includes:

judging whether the current power is smaller than 10% of preset power corresponding to the current rotating speed and whether the current rotating speed is smaller than 2/3 of the preset rotating speed;

Determining that the current power is smaller than 10% of preset power corresponding to the current rotating speed and the current rotating speed is smaller than 2/3 of the preset rotating speed, and controlling the third regulating valve (10) to be closed;

determining whether the current power is greater than or equal to 10% of preset power corresponding to the current rotating speed and the current rotating speed is less than 2/3 of the preset rotating speed, and judging whether the current power is less than or equal to 50% of the preset power corresponding to the current rotating speed;

determining that the current power is less than or equal to 50% of the preset power corresponding to the current rotating speed, and controlling the third regulating valve (10) to be opened until the opening of the third regulating valve is half of the full opening;

and determining that the current power is greater than 50% of the preset power corresponding to the current rotating speed and/or the current rotating speed is greater than or equal to 2/3 of the preset rotating speed, and controlling the third regulating valve (10) to be opened until the opening degree of the third regulating valve is full-opened.

13. The engine lubrication control method according to any one of claims 8 to 10, characterized in that the engine lubrication control method further includes the steps of:

acquiring the current oil temperature of the main oil duct (3);

and controlling the working state of the thermostat (11) based on the relation between the current oil temperature and the preset oil temperature.