CN118065998A - Lubricating system of engine and control method thereof - Google Patents

Abstract

Disclosed are a lubrication system of an engine and a control method thereof, wherein the lubrication system includes: the oil pump comprises a pump body, the pump body comprises an oil outlet, and the oil outlet is communicated with the main oil way through a first output oil way; the sliding block is positioned in the pump body and can eccentrically rotate to adjust the engine oil displacement at the oil outlet; wherein, the sliding block is provided with a convex part; the first oil cavity is arranged between the sliding block and the pump body and is positioned at the first side of the protruding part; the first oil way is connected with the first oil cavity and the first output oil way to provide engine oil for the first oil cavity; the elastic piece is positioned in the first oil cavity, one end of the elastic piece is in contact with the protruding portion, and the elastic piece and oil pressure in the first oil cavity jointly drive the sliding block to move towards the direction of increasing the displacement.

Description

Lubricating system of engine and control method thereof

Technical Field

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

Background

At present, a variable displacement oil pump technology is generally adopted for energy conservation and emission reduction of a gasoline engine, pressure oil is introduced into a feedback oil cavity of the oil pump through a feedback oil duct, and the pressure oil pushes a sliding block to overcome the rotation motion of spring force, so that the rotor of the oil pump and the sliding block are eccentrically changed, and further the displacement change of the oil pump is realized.

However, in the related art, when the oil pump and the engine are started at a low temperature, the eccentric amount of the slider cannot be adjusted in time, resulting in that the oil pressure provided by the oil pump is lower than the target oil pressure, which affects the reliability of the engine operation.

Disclosure of Invention

The present disclosure provides a lubrication system of an engine, comprising:

The oil pump comprises a pump body, the pump body comprises an oil outlet, and the oil outlet is communicated with the main oil way through a first output oil way;

The sliding block is positioned in the pump body and can eccentrically rotate to adjust the engine oil displacement at the oil outlet; wherein the sliding block is provided with a protruding part;

the first oil cavity is arranged between the sliding block and the pump body and is positioned at the first side of the protruding part;

a first oil passage connecting the first oil chamber and the first output oil passage to supply oil to the first oil chamber;

The elastic piece is positioned in the first oil cavity, one end of the elastic piece is in contact with the protruding portion, and the elastic piece and the oil pressure in the first oil cavity jointly drive the sliding block to move towards the direction of increasing the displacement.

In some embodiments, the lubrication system further comprises:

The first valve is arranged in the first oil way and is provided with a conducting state and a closing state, and when the first valve is in the conducting state, the first oil cavity is communicated with the first output oil way;

and the control part is at least connected with the first valve and controls the first valve to switch between a conducting state and a closing state.

In some embodiments, the lubrication system further comprises:

the second oil cavity is arranged between the sliding block and the pump body and is positioned at a second side of the protruding part opposite to the first side;

the second oil way is connected with the second oil cavity and the main oil way;

One end of the third oil way is connected with the second oil way;

and the motor oil pump is connected with the third oil way through a second output oil way so as to provide engine oil for the second oil cavity through the second output oil way, the third oil way and the second oil way.

In some embodiments, the lubrication system further comprises:

The second valve is arranged in the second oil way and is positioned between the third oil way and the main oil way; the second valve is in a conducting state and a closing state, and when the second valve is in the conducting state, the second oil cavity is communicated with the main oil way;

And the control part is at least connected with the second valve and controls the second valve to switch between a conducting state and a closing state.

In some embodiments, the lubrication system further comprises:

the third valve is arranged in the third oil way and is positioned between the motor oil pump and the second oil way, and when the third valve is in a conducting state, the motor oil pump is communicated with the second oil cavity through the second output oil way, the third oil way and the second oil way;

And the control part is connected with at least the third valve and controls the third valve to switch between a conducting state and a closing state.

The present disclosure also provides a control method of a lubrication system, which is applied to the lubrication system of an engine provided by any one of the above embodiments, the control method including:

Starting the engine;

when the lubricating system meets a first setting condition, the oil pump is controlled to provide oil for the first oil cavity through the first output oil way and the first oil way, so that the sliding block moves towards the direction of increasing the displacement under the common driving of the elastic piece and the oil pressure in the first oil cavity.

In some embodiments, the lubrication system further comprises:

The first valve is arranged in the first oil way and is provided with a conducting state and a closing state, and when the first valve is in the conducting state, the first oil cavity is communicated with the first output oil way;

The control part is at least connected with the first valve and controls the first valve to be switched between a conducting state and a closing state;

The control oil pump is through first output oil circuit and first oil circuit provide engine oil for first oil pocket to make the slider is under the elastic component with the oil pressure in the first oil pocket is common drive down the direction that the discharge capacity increases moves, includes:

And judging whether the lubrication system meets the first set condition or not through the control part, and when the lubrication system meets the first set condition, adjusting the first valve to be in a conducting state by the control part, wherein the oil pump supplies engine oil to the first oil cavity through the first output oil circuit and the first oil circuit.

In some embodiments, the lubrication system further comprises:

the second oil cavity is arranged between the sliding block and the pump body and is positioned at a second side of the protruding part opposite to the first side;

the second oil way is connected with the second oil cavity and the main oil way;

One end of the third oil way is connected with the second oil way;

The motor oil pump is connected with the third oil way through a second output oil way so as to provide engine oil for the second oil cavity through the second output oil way, the third oil way and the second oil way;

Before starting the engine, the method further comprises:

When the lubrication system meets a second set condition, the motor oil pump is started, and is controlled to input engine oil into the second oil cavity through the second output oil circuit, the third oil circuit and the second oil circuit, and the oil pressure in the second oil cavity drives the sliding block to move towards the direction of reducing the displacement.

In some embodiments, the lubrication system further comprises:

The third valve is arranged in the third oil way and is positioned between the motor oil pump and the first oil way, and when the third valve is in a conducting state, the motor oil pump is communicated with the second oil cavity through the second output oil way, the third oil way and the second oil way;

A control part connected with at least the third valve, the control part controlling the third valve to switch between a conducting state and a closing state;

Starting the motor oil pump, controlling the motor oil pump to input engine oil into the first oil cavity through the second output oil circuit, the third oil circuit and the first oil circuit, and comprising the following steps:

before the engine is started, the control part is used for judging whether the lubrication system meets the second setting condition, when the lubrication system meets the second setting condition, the control part adjusts the third valve to be in a conducting state and starts the motor oil pump, and the motor oil pump provides engine oil for the second oil cavity through the second output oil way, the third oil way and the second oil way so as to drive the sliding block to move towards the direction of reducing the displacement.

In some embodiments, the lubrication system further comprises: the second valve is arranged in the second oil way and is positioned between the third oil way and the main oil way; the second valve is in a conducting state and a closing state, when the second valve is in the conducting state, the second oil cavity is communicated with the main oil way, the second valve is connected with the control part, and the control part controls the second valve to be switched between the conducting state and the closing state;

Before turning on the motor oil pump and/or switching the third valve to the on state, the method further includes: and adjusting the second valve to a closed state by adopting the control part.

The embodiment of the disclosure provides a lubrication system of an engine and a control method thereof, wherein the lubrication system comprises: the oil pump comprises a pump body, the pump body comprises an oil outlet, and the oil outlet is communicated with the main oil way through a first output oil way; the sliding block is positioned in the pump body and can eccentrically rotate to adjust the engine oil displacement at the oil outlet; wherein the sliding block is provided with a protruding part; the first oil cavity is arranged between the sliding block and the pump body and is positioned at the first side of the protruding part; a first oil passage connecting the first oil chamber and the first output oil passage to supply oil to the first oil chamber; the elastic piece is positioned in the first oil cavity, one end of the elastic piece is in contact with the protruding portion, and the elastic piece and the oil pressure in the first oil cavity jointly drive the sliding block to move towards the direction of increasing the displacement. The lubricating system provided by the embodiment of the disclosure comprises a first oil cavity positioned in a pump body of an oil pump, wherein the first oil cavity is connected with a first output oil path through a first oil path, and an elastic piece is arranged in the first oil cavity.

The details of one or more embodiments of the disclosure are set forth in the accompanying drawings and the description below. Other features and advantages of the present disclosure will be apparent from the description and drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

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

FIG. 2 is a block diagram of a lubrication system of an engine provided by an embodiment of the present disclosure;

fig. 3 is a flow chart of a method of controlling a lubrication system of an engine according to an embodiment of the present disclosure.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present disclosure. However, it will be apparent to one skilled in the art that the present disclosure may be practiced without one or more of these details. In other instances, well-known features have not been described in order to avoid obscuring the present disclosure; that is, not all features of an actual implementation are described in detail herein, and well-known functions and constructions are not described in detail.

In the drawings, the size of layers, regions, elements and their relative sizes may be exaggerated for clarity. Like numbers refer to like elements throughout.

It will be understood that when an element or layer is referred to as being "on" … …, "" adjacent to "… …," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" … …, "" directly adjacent to "… …," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present disclosure. When a second element, component, region, layer or section is discussed, it does not necessarily mean that the first element, component, region, layer or section is present in the present disclosure.

Spatially relative terms, such as "under … …," "under … …," "below," "under … …," "over … …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below … …" and "under … …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

The oil pump is an oil pumping device that pumps out oil in an oil pan through an oil pipe and then supplies the oil to friction surfaces of respective parts by internal pressurization. In order to reduce the oil consumption of an engine, a variable displacement oil pump is adopted to replace a fixed displacement oil pump, engine oil enters a main oil duct through an oil filter and an oil cooler through a pump outlet and then enters an oil pump feedback oil cavity through a feedback oil duct to push a sliding block, so that the spring force rotating motion is overcome, an oil pump rotor and the sliding block are eccentrically changed, and further the displacement change of the engine oil pump is realized, so that the effect of variable adjustment of the displacement aiming at different working conditions is realized.

In the prior art, when the engine is started, the oil pump operates in a maximum displacement state by default. After the engine starts, the engine oil can be changed into displacement after being filled with an engine oil filter, an engine oil cooler, a main oil duct, a feedback oil duct and a feedback oil cavity, the whole displacement changing process is long in required time, especially under the condition of low-temperature cold start, the viscosity of the engine oil is high, when the engine is in a maximum displacement working state, the pressure of the cold start engine oil is high, and high oil pressure easily causes failure oil leakage of a sealing element of a lubricating system.

Meanwhile, in a low-temperature environment, in the initial stage of starting the oil pump and the engine, the oil temperature is low in viscosity and high in oil fluidity, so that the oil in the feedback oil cavity cannot be discharged in time in the variable displacement process of the oil pump, the eccentric amount of the sliding block cannot be adjusted in time, the oil pressure provided by the oil pump is lower than the target oil pressure, and the working reliability of the engine is affected.

Based on this, the following technical solutions of the embodiments of the present disclosure are presented.

Embodiments of the present disclosure provide a lubrication system for an engine, comprising: the oil pump comprises a pump body, the pump body comprises an oil outlet, and the oil outlet is communicated with the main oil way through a first output oil way; the sliding block is positioned in the pump body and can eccentrically rotate to adjust the engine oil displacement at the oil outlet; wherein, the sliding block is provided with a convex part; the first oil cavity is arranged between the sliding block and the pump body and is positioned at the first side of the protruding part; the first oil way is connected with the first oil cavity and the first output oil way to provide engine oil for the first oil cavity; the elastic piece is positioned in the first oil cavity, one end of the elastic piece is in contact with the protruding portion, and the elastic piece and oil pressure in the first oil cavity jointly drive the sliding block to move towards the direction of increasing the displacement.

The lubricating system provided by the embodiment of the disclosure comprises a first oil cavity positioned in a pump body of an oil pump, wherein the first oil cavity is connected with a first output oil path through a first oil path, and an elastic piece is arranged in the first oil cavity.

The following detailed description of specific embodiments of the present disclosure refers to the accompanying drawings. In describing embodiments of the present disclosure in detail, the schematic drawings are not necessarily to scale and are merely illustrative and should not be taken as limiting the scope of the disclosure.

Fig. 1 is a schematic structural diagram of a lubrication system of an engine according to an embodiment of the present disclosure, and fig. 2 is a block structural diagram of the lubrication system of the engine according to the embodiment of the present disclosure. The lubrication system provided by the embodiments of the present disclosure is described in further detail below in conjunction with fig. 1 and 2.

As shown in fig. 1, an embodiment of the present disclosure provides a lubrication system of an engine, including: the oil pump 11, the oil pump 11 includes the pump body 12, the pump body 12 includes the oil-out 14, the oil-out 14 is communicated with main oil way 22 through the first output oil way 21; the sliding block 15 is positioned in the pump body 12, and the sliding block 15 can eccentrically rotate to adjust the engine oil displacement at the oil outlet 14; wherein the slider 15 has a boss 151; a first oil chamber 18 disposed between the slider 15 and the pump body 12 and located at a first side S1 of the boss 151; a first oil passage 23 connecting the first oil chamber 18 and the first output oil passage 21 to supply oil to the first oil chamber 18; the elastic member 17 is located in the first oil chamber 18, one end of the elastic member 17 is in contact with the boss 151, and the elastic member 17 and the oil pressure in the first oil chamber 18 together drive the slider 15 to move in the displacement increasing direction.

In an embodiment, the lubrication system further comprises an oil pan 10 for storing oil. In some embodiments, the oil pump 11 further includes a first oil inlet 13, and the oil pump 11 pumps the oil located in the oil pan 10 into the pump body 12 through the first oil inlet 13, and then delivers the oil from the oil outlet 14 to the first output oil passage 21, and further to the main oil passage 22 and the first oil passage 23 connected to the first output oil passage 21.

Specifically, the oil pump 11 further includes: the rotor 16, when the engine is in a started state, the rotor 16 and the engine are coaxially rotated, and as the rotor 16 rotates, the oil in the oil pan 10 is pumped into the pump body 12 through the first oil inlet 13, and then the rotor 16 compresses and delivers the oil in the pump body 12 from the oil outlet 14 into the first output oil passage 21, and supplies the oil to the respective component friction surfaces through the first output oil passage 21, the main oil passage 22.

In one embodiment, the slider 15 is movably connected with a rotation pin 152, the rotation pin 152 is fixed on the pump body 12, and the slider 15 can rotate with the rotation pin 152 as a rotation center. Since the slider 15 is not coincident with the center of rotation of the rotor 16, when the slider 15 rotates about the rotation pin 152, the slider 15 rotates eccentrically with respect to the rotor 16, i.e., the slider 15 has an eccentric amount with respect to the rotor 16, the magnitude of which affects the oil amount at the oil outlet 14, i.e., the displacement of the oil pump 11. In some embodiments, the oil displacement of the oil pump 11 is proportional to the eccentric amount of the slider 15, and the smaller the eccentric amount of the slider 15, the smaller the displacement of the oil pump 11, and the larger the eccentric amount of the slider 15, the larger the displacement of the oil pump 11.

Taking the lubrication system shown in fig. 1 as an example, the rotation pin 152 is provided on the upper right side of the pump body 12 with respect to the rotor 16, the direction in which the eccentric amount of the slider 15 decreases and the displacement of the oil pump 11 decreases is the direction in which the slider 15 rotates clockwise, and the direction in which the eccentric amount of the slider 15 increases and the displacement of the oil pump 11 increases is the direction in which the slider 15 rotates counterclockwise.

In one embodiment, the lubrication system further comprises: a second oil chamber 19 disposed between the slider 15 and the pump body 12 and located at a second side S2 of the boss 151 opposite to the first side S1; a second oil passage 25 connecting the second oil chamber 19 with the main oil passage 22; the oil pump 11 may supply oil to the second oil chamber 19 through the first output oil path 21, the main oil path 22, and the second oil path 25, and the oil pressure in the second oil chamber 19 pushes the boss 151 to drive the slider 15 to move in a direction in which the displacement is reduced.

In actual operation, at the time of engine start, the oil pump 11 is usually operated in a maximum displacement state by default, and the slider 15 has a maximum eccentric amount with respect to the rotor 16, at which time it is necessary to reduce the displacement of the oil pump 11 in time. However, in the related art, after the engine is started, the engine oil needs to enter the first output oil path 21, the main oil path 22, the second oil path 25 and the second oil chamber 19 from the oil outlet 14, so that the displacement is changed, the whole displacement changing process needs a long time, especially under the condition of low-temperature cold start, the viscosity of the engine oil is high, when the engine is in the maximum displacement working state, the cold start engine oil pressure is high, and the high oil pressure easily causes the failure of sealing elements of the lubrication system to leak oil.

The lubrication system provided by the embodiment of the present disclosure further includes: a third oil passage 31, one end of the third oil passage 31 being connected to the second oil passage 25; the motor oil pump 27, the motor oil pump 27 is connected to the third oil passage 31 through the second output oil passage 29 to supply the second oil chamber 19 with the engine oil through the second output oil passage 29, the third oil passage 31, and the second oil passage 25. The motor oil pump 27 provided in this disclosure is connected with the second oil cavity 19 through the second output oil circuit 29, the third oil circuit 31 and the second oil circuit 25, so, when the lubrication system meets the second setting condition, the embodiment of the disclosure can firstly start the motor oil pump 27 and control the motor oil pump 27 to input engine oil into the second oil cavity 19 through the second output oil circuit 29, the third oil circuit 31 and the second oil circuit 25, and the oil pressure in the second oil cavity 19 pushes the boss 151 to overcome the pretightening force of the elastic member 17 so as to drive the slider 15 to move towards the direction of reducing the displacement, thereby reducing the displacement of the oil pump 11 in time, and avoiding the failure of the sealing member of the lubrication system caused by the too high pressure of cold start engine oil.

In actual operation, the motor oil pump 27 is controlled in rotation speed to control the oil pressure value P1, and the oil pressure value P1 is made larger than the preload of the elastic member 17, so that the slider 15 is driven to move in the displacement decreasing direction.

In some embodiments, the lubrication system further comprises: the second oil inlet 28 communicates with the motor oil pump 27, and the motor oil pump 27 pumps the oil located in the oil pan 10 into the motor oil pump 27 through the second oil inlet 28.

In one embodiment, the lubrication system further comprises: the third valve 32 is disposed in the third oil path 31 and between the motor oil pump 27 and the second oil path 25, and when the third valve 32 is in the on state, the motor oil pump 27 communicates with the second oil chamber 19 through the second output oil path 29, the third oil path 31, and the second oil path 25. In some embodiments, the third valve 32 comprises a one-way valve, such as a one-way solenoid valve. The one-way valve can be directly turned on or turned off in one way based on pressure, and is convenient to control.

As shown in fig. 2, in one embodiment, the lubrication system further comprises: and a control unit 20, wherein the control unit 20 is connected to at least the third valve 32, and the control unit 20 controls the third valve 32 to switch between the on state and the off state. In some embodiments, the control portion 20 is an ECU (Electronic Control Unit ).

In actual operation, before starting the engine, the control portion 20 may be employed to determine whether the lubrication system satisfies the second setting condition, and when the lubrication system satisfies the second setting condition, the control portion 20 adjusts the third valve 32 to the on state and turns on the motor oil pump 27, and the motor oil pump 27 supplies the engine oil to the second oil chamber 19 through the second output oil passage 29, the third oil passage 31, and the second oil passage 25 to drive the slider 15 to move in the displacement decreasing direction.

Here, the second setting condition is not limited as long as it can be determined by the second setting condition, and the current ambient temperature is smaller than the first setting temperature. Wherein the first set temperature has a value ranging from 5 ℃ to-5 ℃ (inclusive), for example, 3 ℃,0 ℃, -3 ℃, and the like. In one embodiment, the first set temperature is 0 ℃, and when the ambient temperature is lower than 0 ℃, the motor oil pump 27 is started and the engine oil is supplied into the second oil chamber 19 through the motor oil pump 27 before the engine starts.

For example, the second set condition may be that the ambient temperature is lower than the first set temperature before the engine is started. However, the second set condition is not limited thereto, and the oil temperature in the oil pan 10 may be lower than a second set temperature defined as the temperature of the oil in the oil pan 10 when the ambient temperature is the first set temperature; still alternatively, the second set condition may be that the viscosity of the oil in the oil pan 10 is greater than the first set viscosity, which is defined as the viscosity of the oil in the oil pan 10 when the ambient temperature is the first set temperature.

As shown in fig. 1, in one embodiment, the lubrication system further comprises: the second valve 26 is arranged in the second oil path 25 and is positioned between the third oil path 31 and the main oil path 22; the second valve 26 has a conducting state and a closing state, and when the second valve 26 is in the conducting state, the second oil chamber 19 is communicated with the main oil passage 22; the second valve 26 is connected to the control unit 20, and controls the second valve 26 to switch between an on state and an off state. In some embodiments, the second valve 26 is a proportional solenoid valve.

In actual operation, before opening the motor oil pump 27 and/or switching the third valve 32 to the on state, the method further comprises: the control unit 20 is used to adjust the second valve 26 to the closed state, so that the oil fed from the third oil passage 31 to the second oil passage 25 is prevented from being split by the main oil passage 22, and the time taken for changing the displacement is increased.

In one embodiment, after the engine oil enters the second oil chamber 19 through the third oil passage 31 and the second oil passage 25 and pushes the slider 15 to move to reduce the displacement of the oil pump 11, the engine is started, and the control portion 20 switches the third valve 32 to the closed state and switches the second valve 26 to the open state.

After the oil pump 11 is operated, the oil pressure in the second oil cavity 19 needs to be adjusted in real time, so that the displacement of the oil pump 11 is adjusted, particularly in a low-temperature environment, the oil temperature is low, the viscosity is high, and the fluidity of the oil is poor at the initial stage of engine starting, so that the oil in the second oil cavity 19 cannot be discharged in time in the process of changing the displacement of the oil pump 11, the eccentric amount of the sliding block 15 cannot be adjusted in time, the oil pressure provided by the oil pump 11 is lower than the target oil pressure, and the working reliability of the engine is affected. The lubrication system provided by the embodiment of the disclosure includes a first oil cavity 18 located in a pump body 12 of an oil pump 11, the first oil cavity 18 is connected with a first output oil channel 21 through a first oil channel 23, and an elastic member 17 is arranged in the first oil cavity 18, so that when the oil pump 11 is in a starting state, especially in a low-temperature starting state, engine oil can be provided to the first oil cavity 18 through the first oil channel 23, the oil pressure in the elastic member 17 and the first oil cavity 18 can jointly drive a sliding block 15 to move in a direction of increasing the displacement, thereby increasing the displacement of the oil pump 11, enabling the oil pump 11 to be quickly adjusted to the target engine oil displacement, and improving the response speed of the variable displacement of the oil pump 11. The elastic member 17 includes, but is not limited to, a spring.

In one embodiment, the lubrication system further comprises: the first valve 24 is arranged in the first oil path 23, the first valve 24 has a conducting state and a closing state, and when the first valve 24 is in the conducting state, the first oil cavity 18 is communicated with the first output oil path 21; the first valve 24 is connected to the control unit 20, and the control unit 20 controls the first valve 24 to switch between an on state and an off state. In some embodiments, the first valve 24 is a proportional solenoid valve.

In actual operation, the embodiment of the disclosure may determine whether the lubrication system satisfies the first setting condition by the control portion 20, and when the lubrication system satisfies the first setting condition, the control portion 20 adjusts the first valve 24 to the on state, and the oil pump 11 supplies the oil into the first oil chamber 18 through the first output oil passage 21 and the first oil passage 23, so that the slider 15 moves in the direction of increasing the displacement under the common driving of the elastic member 17 and the oil pressure in the first oil chamber 18.

Here, the first setting condition is not limited, and it is sufficient that the first setting condition can determine that the displacement of the oil pump 11 is set to the target displacement by increasing the eccentric amount of the slider 15 with respect to the rotor 16 in the activated state of the oil pump 11 to increase the displacement of the oil pump 11. When the displacement of the oil pump 11 reaches the target displacement, the control portion 20 may switch the first oil passage 23 to the closed state, causing the first oil passage 23 to be in the closed state.

For example, the first setting condition may be that the current displacement of the oil pump 11 is smaller than the target displacement of the oil pump 11. However, the first setting condition is not limited thereto, and the oil pressure of the second oil chamber 19 may be larger than the target oil pressure.

In addition, when the control portion 20 determines that the displacement of the oil pump 11 is greater than the target displacement, the control portion 20 may switch the first valve 24 to the on state, so that the oil in the first oil chamber 11 may flow out through the first oil passage 23, so that the oil pressure in the second oil chamber 19 may push the slider 15 to move in the direction in which the eccentric amount decreases against the pre-tightening force of the elastic member 17.

As shown in fig. 1, in an embodiment, the control system further includes: a fourth oil passage 33, the fourth oil passage 33 being connected to the third oil passage 31 and being located at an end of the third oil passage 31 remote from the second oil passage 25, the motor oil pump 27 being located between the fourth oil passage 33 and the third valve 32; the supercharger 34 and the camshaft 35 are provided at both ends of the fourth oil passage 33, respectively, and the motor oil pump 27 supplies oil to the supercharger 34 and the camshaft 35 through the second output oil passage 29, the third oil passage 31, and the fourth oil passage 33, respectively, to lubricate friction surfaces of the supercharger 34 and the camshaft 35.

The embodiment of the disclosure also provides a control method of a lubrication system, where the control method is applied to the lubrication system of an engine provided in the above embodiments, as shown in fig. 3, and the control method includes:

Step S101, starting the engine.

And S102, when the lubrication system meets a first set condition, controlling the oil pump to provide oil for the first oil cavity through the first output oil way and the first oil way so that the sliding block moves towards the direction of increasing the displacement under the common driving of the elastic piece and the oil pressure in the first oil cavity.

The control method provided by the embodiment of the present disclosure is further described in detail below with reference to the accompanying drawings.

First, step S101 is executed to start the engine.

In an embodiment, the lubrication system further comprises an oil pan 10 for storing oil. In some embodiments, the oil pump 11 further includes a first oil inlet 13, and the oil pump 11 pumps the oil located in the oil pan 10 into the pump body 12 through the first oil inlet 13, and then delivers the oil from the oil outlet 14 to the first output oil passage 21, and further to the main oil passage 22 and the first oil passage 23 connected to the first output oil passage 21.

Specifically, the oil pump 11 further includes: the rotor 16, when the engine is in a started state, the rotor 16 and the engine are coaxially rotated, and as the rotor 16 rotates, the oil in the oil pan 10 is pumped into the pump body 12 through the first oil inlet 13, and then the rotor 16 compresses and delivers the oil in the pump body 12 from the oil outlet 14 into the first output oil passage 21, and supplies the oil to the respective component friction surfaces through the first output oil passage 21, the main oil passage 22.

In one embodiment, the slider 15 is movably connected with a rotation pin 152, the rotation pin 152 is fixed on the pump body 12, and the slider 15 can rotate with the rotation pin 152 as a rotation center. Since the slider 15 is not coincident with the center of rotation of the rotor 16, when the slider 15 rotates about the rotation pin 152, the slider 15 rotates eccentrically with respect to the rotor 16, i.e., the slider 15 has an eccentric amount with respect to the rotor 16, the magnitude of which affects the oil amount at the oil outlet 14, i.e., the displacement of the oil pump 11. In some embodiments, the oil displacement of the oil pump 11 is proportional to the eccentric amount of the slider 15, and the smaller the eccentric amount of the slider 15, the smaller the displacement of the oil pump 11, and the larger the eccentric amount of the slider 15, the larger the displacement of the oil pump 11.

Taking the lubrication system shown in fig. 1 as an example, the rotation pin 152 is provided on the upper right side of the pump body 12 with respect to the rotor 16, the direction in which the eccentric amount of the slider 15 decreases and the displacement of the oil pump 11 decreases is the direction in which the slider 15 rotates clockwise, and the direction in which the eccentric amount of the slider 15 increases and the displacement of the oil pump 11 increases is the direction in which the slider 15 rotates counterclockwise.

In one embodiment, the lubrication system further comprises: a second oil chamber 19 disposed between the slider 15 and the pump body 12 and located at a second side S2 of the boss 151 opposite to the first side S1; a second oil passage 25 connecting the second oil chamber 19 with the main oil passage 22; when the engine is in a starting state, the oil pump 11 can supply oil to the second oil chamber 19 through the first output oil path 21, the main oil path 22 and the second oil path 25, and the oil pressure in the second oil chamber 19 pushes the boss 151 to drive the slider 15 to move in a displacement decreasing direction.

In actual operation, at the time of engine start, the oil pump 11 is usually operated in a maximum displacement state by default, and the slider 15 has a maximum eccentric amount with respect to the rotor 16, at which time it is necessary to reduce the displacement of the oil pump 11 in time. However, in the related art, after the engine is started, the engine oil needs to enter the first output oil path 21, the main oil path 22, the second oil path 25 and the second oil chamber 19 from the oil outlet 14, so that the displacement is changed, the whole displacement changing process needs a long time, especially under the condition of low-temperature cold start, the viscosity of the engine oil is high, when the engine is in the maximum displacement working state, the cold start engine oil pressure is high, and the high oil pressure easily causes the failure of sealing elements of the lubrication system to leak oil.

The lubrication system provided by the embodiment of the present disclosure further includes: a third oil passage 31, one end of the third oil passage 31 being connected to the second oil passage 25; a motor oil pump 27, the motor oil pump 27 being connected to the third oil passage 31 through the second output oil passage 29 to supply the second oil chamber 19 with the engine oil through the second output oil passage 29, the third oil passage 31, and the second oil passage 25; before starting the engine, the method further comprises:

when the lubrication system satisfies the second setting condition, the motor oil pump 27 is turned on, and the motor oil pump 27 is controlled to input the engine oil into the second oil chamber 19 through the second output oil passage 29, the third oil passage 31, and the second oil passage 25, and the oil pressure in the second oil chamber 19 drives the slider 15 to move in the displacement decreasing direction.

In actual operation, the motor oil pump 27 is controlled in rotation speed to control the oil pressure value P1, and the oil pressure value P1 is made larger than the preload of the elastic member 17, so that the slider 15 is driven to move in the displacement decreasing direction.

The motor oil pump 27 provided in this disclosure is connected with the second oil cavity 19 through the second output oil circuit 29, the third oil circuit 31 and the second oil circuit 25, so, when the lubrication system meets the second setting condition, the embodiment of the disclosure can firstly start the motor oil pump 27 and control the motor oil pump 27 to input engine oil into the second oil cavity 19 through the second output oil circuit 29, the third oil circuit 31 and the second oil circuit 25, and the oil pressure in the second oil cavity 19 pushes the boss 151 to overcome the pretightening force of the elastic member 17 so as to drive the slider 15 to move towards the direction of reducing the displacement, thereby reducing the displacement of the oil pump 11 in time, and avoiding the failure of the sealing member of the lubrication system caused by the too high pressure of cold start engine oil.

In some embodiments, the lubrication system further comprises: the second oil inlet 28 communicates with the motor oil pump 27, and the motor oil pump 27 pumps the oil located in the oil pan 10 into the motor oil pump 27 through the second oil inlet 28.

As shown in fig. 1 and 2, in one embodiment, the lubrication system further comprises: a third valve 32 disposed in the third oil path 31 and located between the motor oil pump 27 and the second oil path 25, wherein when the third valve 32 is in a conductive state, the motor oil pump 27 communicates with the second oil chamber 19 through the second output oil path 29, the third oil path 31 and the second oil path 25; a control unit 20, the control unit 20 being connected to at least the third valve 32, the control unit 20 controlling the third valve 32 to switch between an on state and an off state; the motor oil pump 27 is turned on, and the motor oil pump 27 is controlled to input engine oil into the second oil chamber 19 through the second output oil passage 29, the third oil passage 31, and the second oil passage 25, including:

Before starting the engine, the control portion 20 is employed to determine whether the lubrication system satisfies a second set condition, and when the lubrication system satisfies the second set condition, the control portion 20 adjusts the third valve 32 to the on state and turns on the motor oil pump 27, and the motor oil pump 27 supplies oil to the second oil chamber 19 through the second output oil passage 29, the third oil passage 31, and the second oil passage 25 to drive the slider 15 to move in the displacement decreasing direction.

In one embodiment, the third valve 32 comprises a one-way valve, such as a one-way solenoid valve. The one-way valve can be directly turned on or turned off in one way based on pressure, and is convenient to control. In some embodiments, the control portion 20 is an ECU (Electronic Control Unit ).

Here, the second setting condition is not limited as long as it can be determined by the second setting condition, and the current ambient temperature is smaller than the first setting temperature. Wherein the first set temperature has a value ranging from 5 ℃ to-5 ℃ (inclusive), for example, 3 ℃,0 ℃, -3 ℃, and the like. In one embodiment, the first set temperature is 0 ℃, and when the ambient temperature is lower than 0 ℃, the motor oil pump 27 is started and the engine oil is supplied into the second oil chamber 19 through the motor oil pump 27 before the engine starts.

For example, the second set condition may be that the ambient temperature is lower than the first set temperature before the engine is started. However, the second set condition is not limited thereto, and the oil temperature in the oil pan 10 may be lower than a second set temperature defined as the temperature of the oil in the oil pan 10 when the ambient temperature is the first set temperature; still alternatively, the second set condition may be that the viscosity of the oil in the oil pan 10 is greater than the first set viscosity, which is defined as the viscosity of the oil in the oil pan 10 when the ambient temperature is the first set temperature.

As shown in fig. 1, in one embodiment, the lubrication system further comprises: the second valve 26 is arranged in the second oil path 25 and is positioned between the third oil path 31 and the main oil path 22; the second valve 26 has a conducting state and a closing state, and when the second valve 26 is in the conducting state, the second oil chamber 19 is communicated with the main oil passage 22; the second valve 26 is connected to the control unit 20, and controls the second valve 26 to switch between an on state and an off state; before turning on the motor oil pump 27 and/or switching the third valve 32 to the on state, the method further includes: the control unit 20 is used to adjust the second valve 26 to the closed state, so that the oil fed from the third oil passage 31 to the second oil passage 25 is prevented from being split by the main oil passage 22, and the time taken for changing the displacement is increased. In some embodiments, the second valve 26 is a proportional solenoid valve.

In an embodiment, after engine oil enters the second oil chamber 19 through the third oil passage 31 and the second oil passage 25 and pushes the slider 15 to move to reduce the displacement of the oil pump 11, after starting the engine, the method further includes: the control unit 20 is used to switch the third valve 32 to the closed state and to switch the second valve 26 to the open state.

As shown in fig. 1, in an embodiment, the control system further includes: a fourth oil passage 33, the fourth oil passage 33 being connected to the third oil passage 31 and being located at an end of the third oil passage 31 remote from the second oil passage 25, the motor oil pump 27 being located between the fourth oil passage 33 and the third valve 32; the supercharger 34 and the camshaft 35 are provided at both ends of the fourth oil passage 33, respectively. In some embodiments, after turning on the motor oil pump, the method further comprises: the motor oil pump 27 is used to supply oil to the supercharger 34 and the camshaft 35 through the second output oil passage 29, the third oil passage 31, and the fourth oil passage 33, respectively, to lubricate the friction surfaces of the supercharger 34 and the camshaft 35, so that the supercharger 34 and the camshaft 35 can be lubricated before the engine is started, reducing wear.

Next, step S102 is performed, and when the lubrication system satisfies the first setting condition, the oil pump 11 is controlled to supply oil to the first oil chamber 18 through the first output oil passage 21 and the first oil passage 23 so that the slider 15 is moved in the displacement increasing direction by the elastic member 17 together with the oil pressure in the first oil chamber 18.

After the oil pump 11 is operated, the oil pressure in the second oil cavity 19 needs to be adjusted in real time, so that the displacement of the oil pump 11 is adjusted, particularly in a low-temperature environment, the oil temperature is low, the viscosity is high, and the fluidity of the oil is poor at the initial stage of engine starting, so that the oil in the second oil cavity 19 cannot be discharged in time in the process of changing the displacement of the oil pump 11, the eccentric amount of the sliding block 15 cannot be adjusted in time, the oil pressure provided by the oil pump 11 is lower than the target oil pressure, and the working reliability of the engine is affected. The lubrication system provided by the embodiment of the disclosure includes a first oil cavity 18 located in a pump body 12 of an oil pump 11, the first oil cavity 18 is connected with a first output oil channel 21 through a first oil channel 23, and an elastic member 17 is arranged in the first oil cavity 18. The elastic member 17 includes, but is not limited to, a spring.

In one embodiment, the lubrication system further comprises: the first valve 24 is arranged in the first oil path 23, the first valve 24 has a conducting state and a closing state, and when the first valve 24 is in the conducting state, the first oil cavity 18 is communicated with the first output oil path 21; the first valve 24 is connected to the control unit 20, and the control unit 20 controls the first valve 24 to switch between an on state and an off state; the control oil pump 11 supplies oil to the first oil chamber 18 through the first output oil passage 21 and the first oil passage 23 to move the slider 15 in a displacement increasing direction by the elastic member 17 and the oil pressure in the first oil chamber 18 being driven together, comprising: whether the lubrication system satisfies the first setting condition is determined by the control unit 20, and when the lubrication system satisfies the first setting condition, the control unit 20 adjusts the first valve 24 to the on state, and the oil pump 11 supplies the oil into the first oil chamber 18 through the first output oil passage 21 and the first oil passage 23 so that the slider 15 moves in the direction of increasing the displacement under the common driving of the elastic member 17 and the oil pressure in the first oil chamber 18. In some embodiments, the first valve 24 is a proportional solenoid valve.

Here, the first setting condition is not limited, and it is sufficient that the first setting condition can determine that the displacement of the oil pump 11 is set to the target displacement by increasing the eccentric amount of the slider 15 with respect to the rotor 16 in the activated state of the oil pump 11 to increase the displacement of the oil pump 11. When the displacement of the oil pump 11 reaches the target displacement, the control portion 20 may switch the first oil passage 23 to the closed state, causing the first oil passage 23 to be in the closed state.

For example, the first setting condition may be that the current displacement of the oil pump 11 is smaller than the target displacement of the oil pump 11. However, the first setting condition is not limited thereto, and the oil pressure of the second oil chamber 19 may be larger than the target oil pressure.

Further, when the control portion 20 determines that the displacement of the oil pump 11 is greater than the target displacement, the method further includes: the control part 20 is adopted to switch the first valve 24 to a conducting state, and the engine oil in the first oil cavity 18 flows out through the first oil way 23, so that the oil pressure in the second oil cavity 19 is convenient to overcome the pretightening force of the elastic piece 17 to push the sliding block 15 to move towards the direction of reducing the eccentric amount.

It can be seen that, in the embodiment of the disclosure, before the engine is started, the engine oil is input into the second chamber 19 through the motor oil pump 27, so that the displacement of the oil pump 11 can be reduced in time before the engine is started, the condition that the sealing element of the lubrication system fails and leaks oil is avoided due to the excessively high pressure of the cold-start engine oil, and the first oil cavity 18 is supplied with engine oil through the first oil channel 23, the elastic element 17 and the oil pressure in the first oil cavity 18 jointly drive the sliding block 15 to move towards the direction of increasing the displacement, so that the oil pump 11 is quickly adjusted to the target engine oil displacement, and the response speed of the variable displacement of the engine oil pump 11 after the engine is started, especially in the cold-start state of the engine, is improved.

It should be noted that the above-mentioned sequences of steps can be changed by those skilled in the art without departing from the scope of the present disclosure, and the above-mentioned embodiments are merely alternative examples of the present disclosure, and are not intended to limit the scope of the present disclosure, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present disclosure are intended to be included in the scope of the present disclosure.

Claims (10)

1. A lubrication system of an engine, comprising:

The oil pump comprises a pump body, the pump body comprises an oil outlet, and the oil outlet is communicated with the main oil way through a first output oil way;

The sliding block is positioned in the pump body and can eccentrically rotate to adjust the engine oil displacement at the oil outlet; wherein the sliding block is provided with a protruding part;

the first oil cavity is arranged between the sliding block and the pump body and is positioned at the first side of the protruding part;

a first oil passage connecting the first oil chamber and the first output oil passage to supply oil to the first oil chamber;

The elastic piece is positioned in the first oil cavity, one end of the elastic piece is in contact with the protruding portion, and the elastic piece and the oil pressure in the first oil cavity jointly drive the sliding block to move towards the direction of increasing the displacement.

2. The lubrication system of claim 1, further comprising:

The first valve is arranged in the first oil way and is provided with a conducting state and a closing state, and when the first valve is in the conducting state, the first oil cavity is communicated with the first output oil way;

and the control part is at least connected with the first valve and controls the first valve to switch between a conducting state and a closing state.

3. The lubrication system of claim 1, further comprising:

the second oil cavity is arranged between the sliding block and the pump body and is positioned at a second side of the protruding part opposite to the first side;

the second oil way is connected with the second oil cavity and the main oil way;

One end of the third oil way is connected with the second oil way;

and the motor oil pump is connected with the third oil way through a second output oil way so as to provide engine oil for the second oil cavity through the second output oil way, the third oil way and the second oil way.

4. A lubrication system according to claim 3, further comprising:

The second valve is arranged in the second oil way and is positioned between the third oil way and the main oil way; the second valve is in a conducting state and a closing state, and when the second valve is in the conducting state, the second oil cavity is communicated with the main oil way;

And the control part is at least connected with the second valve and controls the second valve to switch between a conducting state and a closing state.

5. A lubrication system according to claim 3, further comprising:

the third valve is arranged in the third oil way and is positioned between the motor oil pump and the second oil way, and when the third valve is in a conducting state, the motor oil pump is communicated with the second oil cavity through the second output oil way, the third oil way and the second oil way;

And the control part is connected with at least the third valve and controls the third valve to switch between a conducting state and a closing state.

6. A control method of a lubrication system, characterized in that the control method is applied to the lubrication system of an engine according to any one of claims 1 to 5, the control method comprising:

Starting the engine;

when the lubricating system meets a first setting condition, the oil pump is controlled to provide oil for the first oil cavity through the first output oil way and the first oil way, so that the sliding block moves towards the direction of increasing the displacement under the common driving of the elastic piece and the oil pressure in the first oil cavity.

7. The control method of claim 6, wherein the lubrication system further comprises:

The first valve is arranged in the first oil way and is provided with a conducting state and a closing state, and when the first valve is in the conducting state, the first oil cavity is communicated with the first output oil way;

The control part is at least connected with the first valve and controls the first valve to be switched between a conducting state and a closing state;

The control oil pump is through first output oil circuit and first oil circuit provide engine oil for first oil pocket to make the slider is under the elastic component with the oil pressure in the first oil pocket is common drive down the direction that the discharge capacity increases moves, includes:

And judging whether the lubrication system meets the first set condition or not through the control part, and when the lubrication system meets the first set condition, adjusting the first valve to be in a conducting state by the control part, wherein the oil pump supplies engine oil to the first oil cavity through the first output oil circuit and the first oil circuit.

8. The control method of claim 6, wherein the lubrication system further comprises:

the second oil cavity is arranged between the sliding block and the pump body and is positioned at a second side of the protruding part opposite to the first side;

the second oil way is connected with the second oil cavity and the main oil way;

One end of the third oil way is connected with the second oil way;

The motor oil pump is connected with the third oil way through a second output oil way so as to provide engine oil for the second oil cavity through the second output oil way, the third oil way and the second oil way;

Before starting the engine, the method further comprises:

When the lubrication system meets a second set condition, the motor oil pump is started, and is controlled to input engine oil into the second oil cavity through the second output oil circuit, the third oil circuit and the second oil circuit, and the oil pressure in the second oil cavity drives the sliding block to move towards the direction of reducing the displacement.

9. The control method of claim 8, wherein the lubrication system further comprises:

The third valve is arranged in the third oil way and is positioned between the motor oil pump and the first oil way, and when the third valve is in a conducting state, the motor oil pump is communicated with the second oil cavity through the second output oil way, the third oil way and the second oil way;

A control part connected with at least the third valve, the control part controlling the third valve to switch between a conducting state and a closing state;

Starting the motor oil pump, controlling the motor oil pump to input engine oil into the first oil cavity through the second output oil circuit, the third oil circuit and the first oil circuit, and comprising the following steps:

before the engine is started, the control part is used for judging whether the lubrication system meets the second setting condition, when the lubrication system meets the second setting condition, the control part adjusts the third valve to be in a conducting state and starts the motor oil pump, and the motor oil pump provides engine oil for the second oil cavity through the second output oil way, the third oil way and the second oil way so as to drive the sliding block to move towards the direction of reducing the displacement.

10. The control method of claim 9, wherein the lubrication system further comprises: the second valve is arranged in the second oil way and is positioned between the third oil way and the main oil way; the second valve is in a conducting state and a closing state, when the second valve is in the conducting state, the second oil cavity is communicated with the main oil way, the second valve is connected with the control part, and the control part controls the second valve to be switched between the conducting state and the closing state;

Before turning on the motor oil pump and/or switching the third valve to the on state, the method further includes: and adjusting the second valve to a closed state by adopting the control part.