CN117514409A - Engine lubrication system and control method thereof - Google Patents

Abstract

The invention provides an engine lubrication system and a control method thereof, relating to the technical field of engines, wherein the engine lubrication system comprises: an oil pan for storing lubricating oil; the first port of the first oil pump is communicated with the oil pan, and the second port of the first oil pump is used for being communicated with the engine; the first port of the second oil pump is communicated with the oil pan, and the second port of the second oil pump is used for being communicated with the engine; the controller is electrically connected with the first oil pump and the second oil pump respectively, and is arranged to judge whether the second oil pump needs to be controlled to pre-lubricate the engine according to the vehicle working condition data before the engine is started, control the second oil pump according to the judging result and control the first oil pump to pump lubricating oil from the oil pan to the engine when the engine is started. The invention can ensure the normal establishment of oil pressure during the cold start of the engine and reduce the friction loss during the start of the engine.

Description

Engine lubrication system and control method thereof

Technical Field

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

Background

Hybrid vehicles are becoming more popular with consumers because of their advantages of both energy conservation and long endurance. Among them, in order to improve driving comfort and energy saving, consumers often prefer to use an electric drive mode when driving a hybrid vehicle, and the engine is only operated as an auxiliary power intervention when power shortage or rapid acceleration is required, which results in frequent start-stop of the engine in the hybrid vehicle.

In order to avoid dry friction during engine starting and running, oil is pumped to the engine by a mechanical oil pump or an electric oil pump so as to lubricate the engine. However, on the one hand, the mechanical oil pump can only supply oil to the engine after the engine is started, so that the engine is easy to start in a dry friction way under the condition of no base oil film, and for a hybrid vehicle, the frequent start and stop of the engine can cause excessive dry friction start, so that the loss of an engine friction pair is large. On the other hand, the electric oil pump is insufficient in cold starting capability and impurity resistance, and is easy to be jammed and incapable of establishing engine oil pressure, so that the engine cannot normally operate.

Disclosure of Invention

The invention solves the problem of ensuring the normal establishment of the oil pressure of the engine during the cold start of the engine and reducing the friction loss during the start of the engine.

In order to solve the problems, the invention provides an engine lubrication system and a control method thereof.

In a first aspect, the present invention provides an engine lubrication system comprising:

an oil pan for storing lubricating oil;

a first oil pump, a first port of which is communicated with the oil pan, and a second port of which is used for communicating with an engine;

a second oil pump, a first port of the second oil pump being in communication with the oil pan, a second port of the second oil pump being for communication with the engine;

the controller is electrically connected with the first oil pump and the second oil pump respectively, and is configured to judge whether the second oil pump needs to be controlled to pre-lubricate the engine pump according to vehicle working condition data before the engine is started, control the second oil pump according to a judgment result and control the first oil pump to pump lubricating oil from the oil pan to the engine when the engine is started;

the vehicle working condition data comprises at least one of a whole vehicle power-on state, a vehicle gradient angle, a vehicle load, a battery electric quantity and an engine stop time.

Optionally, the controller is specifically configured to:

when the second oil pump is determined to be required to be controlled to pre-lubricate the engine, controlling the second oil pump to pump lubricating oil from the oil pan to the engine;

when it is determined that the second oil pump does not need to be controlled to pre-lubricate the engine, the second oil pump is not started.

Optionally, the controller is specifically configured to:

when the whole vehicle electrifying state shows that the vehicle electrifying is successful, judging whether the battery electric quantity of the vehicle is smaller than or equal to a preset electric quantity value;

if yes, controlling the second oil pump to pump lubricating oil from the oil pan to the engine, and pre-lubricating the engine for a first period of time; and if not, controlling the second oil pump to pump lubricating oil from the oil pan to the engine according to the engine stop time.

Optionally, the controller is specifically further configured to:

judging whether the engine stop time is longer than or equal to a preset time;

if yes, controlling the second oil pump to pump lubricating oil from the oil pan to the engine, and pre-lubricating the engine for a second period of time; and if not, controlling the second oil pump to pump lubricating oil from the oil pan to the engine according to the gradient angle of the vehicle.

Optionally, the controller is specifically further configured to:

judging whether the gradient angle of the vehicle is larger than or equal to a preset gradient value;

if yes, controlling the second oil pump to pump lubricating oil from the oil pan to the engine, and pre-lubricating the engine for a third period of time; and if not, controlling the second oil pump to pump lubricating oil from the oil pan to the engine according to the vehicle load.

Optionally, the controller is specifically further configured to:

judging whether the vehicle load is greater than or equal to a preset load value;

if yes, controlling the second oil pump to pump lubricating oil from the oil pan to the engine, and pre-lubricating the engine for a fourth period of time; if not, it means that the engine does not need to be pre-lubricated.

Optionally, the first duration is positively correlated with the preset electrical quantity value; and/or, the second duration is positively correlated with the preset duration; and/or, the third duration is inversely related to the preset gradient value; and/or, the fourth duration is inversely related to the preset load value; and/or, the first duration, the second duration, the third duration, and the fourth duration are all inversely related to the lube oil temperature.

Optionally, the engine lubrication system further comprises a lube oil suction filter, a first check valve and a second check valve;

the first port of the first oil pump is communicated with the oil pan through the lubricating oil suction filter, the first one-way valve is arranged between the first port of the first oil pump and the lubricating oil suction filter, and the first one-way valve is in one-way conduction from the lubricating oil suction filter to the first oil pump;

the first port of the second oil pump is communicated with the oil pan through the lubricating oil suction filter, the second one-way valve is arranged between the first port of the second oil pump and the lubricating oil suction filter, and the second one-way valve is conducted from the lubricating oil suction filter to the second oil pump in a one-way mode.

Optionally, the engine lubrication system further comprises a third check valve and a fourth check valve;

the third one-way valve is arranged between the second port of the first oil pump and the engine, and is in one-way conduction from the first oil pump to the engine;

the fourth one-way valve is arranged between the second port of the second oil pump and the engine, and the fourth one-way valve is conducted from the second oil pump to the engine in a one-way mode.

In a second aspect, the present invention provides a control method of an engine lubrication system, applied to the engine lubrication system according to the first aspect, the control method of the engine lubrication system comprising:

acquiring vehicle working condition data, wherein the vehicle working condition data comprises at least one of a whole vehicle power-on state, a vehicle gradient angle, a vehicle load, a battery electric quantity and an engine stop time;

before an engine is started, judging whether a second oil pump needs to be controlled to pre-lubricate the engine according to vehicle working condition data, and controlling the second oil pump according to a judging result;

when the engine is started, a first oil pump is controlled to pump lubricating oil from the oil pan to the engine.

The engine lubrication system and the control method thereof have the beneficial effects that: the engine lubricating system comprises an oil pan for storing lubricating oil, a first oil pump, a second oil pump and a controller, wherein the first oil pump and the second oil pump are both used for pumping the lubricating oil in the oil bottom pump to the engine, and the controller is used for receiving vehicle working condition data acquired by the sensor. And before the engine is started, whether the engine needs to be pre-lubricated or not can be judged according to the vehicle working condition data, and the second oil pump is controlled according to the judging result, for example, if the engine needs to be pre-lubricated, the second oil pump is controlled to pump lubricating oil from the oil pan to the engine so as to realize the pre-lubrication of the engine, and further, the dry friction start of the engine is avoided, so that the loss of the friction pair of the engine is reduced. When the engine is started, the first oil pump is controlled to pump lubricating oil from the oil pan to the engine, and on the basis that the second oil pump pre-lubricates the engine, namely under the condition that part of lubricating oil exists in the engine through pre-lubrication, the first oil pump continues to pump the lubricating oil to the engine, so that the normal establishment of the oil pressure of the engine during cold start of the engine can be ensured, and further the normal operation of the engine is ensured. Therefore, the invention reduces the friction loss when the engine is started under the condition of ensuring the normal operation of the engine.

Drawings

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

FIG. 2 is a schematic diagram of an electrical connection structure of an engine lubrication system according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of engine pre-lubrication duration for different vehicle operating condition data according to an embodiment of the present invention;

fig. 4 is a flowchart of a control method of an engine lubrication system according to an embodiment of the present invention.

Reference numerals illustrate:

100. an oil pan; 101. a lubricating oil suction filter; 102. a second one-way valve; 103. a first one-way valve; 104. a first oil pump; 105. a second oil pump; 106. a third one-way valve; 107. a fourth one-way valve; 108. an engine.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. While the invention is susceptible of embodiment in the drawings, it is to be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided to provide a more thorough and complete understanding of the invention. It should be understood that the drawings and embodiments of the invention are for illustration purposes only and are not intended to limit the scope of the present invention.

It should be understood that the various steps recited in the method embodiments of the present invention may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the invention is not limited in this respect.

The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "alternative embodiments". Related definitions of other terms will be given in the description below. It should be noted that the terms "first," "second," and the like herein are merely used for distinguishing between different devices, modules, or units and not for limiting the order or interdependence of the functions performed by such devices, modules, or units.

It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that "one or more" is intended to be construed as "one or more" unless the context clearly indicates otherwise.

The names of messages or information interacted between the devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of such messages or information.

As shown in fig. 1 and 2, an engine lubrication system according to an embodiment of the present invention includes:

the oil pan 100 stores lubricating oil.

Specifically, the lubricating oil is used to reduce friction between friction pairs of the engine 108, and serves for lubrication, cooling, cleaning, and the like.

A first oil pump 104 (MOP in fig. 1), a first port of the first oil pump 104 being in communication with the oil pan 100, and a second port of the first oil pump 104 being for communication with an engine 108 (MOG in fig. 1).

Specifically, the first oil pump 104 may employ a mechanical oil pump that is directly driven by the crankshaft of the engine 108, or driven by the engine 108 through a chain or belt, or the like. The first oil pump 104 may pump lubricating oil in the oil pan 100 to the engine 108.

A second oil pump 105 (EOP in fig. 1), a first port of the second oil pump 105 being in communication with the oil pan 100, a second port of the second oil pump 105 being for communication with the engine 108.

Specifically, the second oil pump 105 may employ an electric oil pump that is driven by the vehicle battery power supply. The second oil pump 105 may also pump lubricating oil in the oil pan 100 to the engine 108.

A controller electrically connected to the first oil pump 104 and the second oil pump 105, respectively, the controller being configured to determine whether the second oil pump 105 needs to be controlled to pre-lubricate the engine 108 according to vehicle operating condition data before the engine 108 is started, control the second oil pump 105 according to a determination result, and control the first oil pump 104 to pump lubricating oil from the oil pan 100 to the engine 108 when the engine 108 is started;

the vehicle working condition data comprises at least one of a whole vehicle power-on state, a vehicle gradient angle, a vehicle load, a battery electric quantity and an engine stop time.

Specifically, the controller is configured to receive vehicle operating condition data collected by the sensor, process the vehicle operating condition data, and control the first oil pump 104 and the second oil pump 105 to operate. The vehicle operating condition data may also include lube oil temperature, etc. The duration of pre-lubrication of engine 108 may be different for different vehicle operating conditions, e.g., the duration of pre-lubrication of engine 108 may be inversely related to the temperature of the lubricating oil.

Before the engine 108 is started, the controller judges whether the second oil pump 105 needs to be controlled to pre-lubricate the engine 108 according to the vehicle working condition data, if so, the second oil pump 105 is controlled to be started, so that an oil film exists in the engine 108 before the engine 108 is started, and further dry friction of a friction pair caused by the engine 108 started in an oil shortage state is avoided; if not, the second oil pump 105 is not started, and the first oil pump 104 is directly controlled to start.

At the start of the engine 108, the first oil pump 104 is controlled to pump the lubricating oil in the oil pan 100 to the engine 108, and in the case where the pre-lubrication is such that the lubricating oil is already present in the engine, the cold start pressure build-up capability of the engine 108 is improved to ensure the normal start of the engine 108.

It will be appreciated that the second oil pump 105 may assist in supplying oil when the oil supply capacity of the first oil pump 104 is insufficient, in addition to supplying oil to the engine 108 to pre-lubricate the engine 108. In addition, when the second oil pump 105 is not needed to pre-lubricate the engine 108, for example, when the temperature of the lubricating oil meets the requirement, the first oil pump 104 is directly controlled to supply oil to the engine 108, and the normal establishment of the oil pressure of the engine can be ensured.

In the present embodiment, the engine lubrication system includes an oil pan 100 for storing lubricating oil, a first oil pump 104, a second oil pump 105, and a controller, and the first oil pump 104 and the second oil pump 105 are each used to pump the lubricating oil in the oil pan pump to the engine 108. The controller is used for receiving the vehicle working condition data acquired by the sensor. Before the engine 108 is started, whether the engine 108 needs to be pre-lubricated can be determined according to the vehicle working condition data, and the second oil pump is controlled according to the determination result, for example, if the engine needs to be pre-lubricated, the second oil pump 105 is controlled to pump lubricating oil from the oil pan 100 to the engine 108, so as to pre-lubricate the engine 108, further avoid dry friction start of the engine 108, and reduce the loss of the friction pair of the engine 108. When the engine 108 is started, the first oil pump 104 is controlled to pump lubricating oil from the oil pan 100 to the engine 108, and on the basis that the second oil pump 105 pre-lubricates the engine 108, namely, under the condition that part of lubricating oil exists in the engine 108 through pre-lubrication, the first oil pump 104 continues to pump the lubricating oil to the engine 108, so that the normal establishment of the engine oil pressure during the cold start of the engine 108 can be ensured, and the normal operation of the engine 108 is further ensured. Therefore, the present invention reduces the frictional loss at the start of the engine 108 while ensuring the normal operation of the engine 108.

Optionally, the controller is specifically configured to:

when it is determined that the second oil pump 105 needs to be controlled to pre-lubricate the engine 108, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108;

when it is determined that it is not necessary to control the second oil pump 105 to pre-lubricate the engine 108, the second oil pump 105 is not started.

Specifically, before the engine 108 is started, it is determined whether the engine 108 needs to be pre-lubricated according to the vehicle condition data. If the engine 108 needs to be pre-lubricated, the second oil pump 105 is controlled to pump the lubricating oil in the oil pan 100 to the engine 108, and the engine 108 is pre-lubricated. If the engine 108 does not need to be pre-lubricated, the second oil pump 105 does not need to be controlled to operate.

Optionally, the controller is specifically configured to:

when the whole vehicle electrifying state shows that the vehicle electrifying is successful, judging whether the battery electric quantity of the vehicle is smaller than or equal to a preset electric quantity value;

if yes, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108, and pre-lubricating the engine 108 for a first period of time; if not, the second oil pump 105 is controlled to pump lubricating oil from the oil pan 100 to the engine 108 according to the engine stop time period.

Specifically, when the entire vehicle energization state shows that the vehicle energization is successful, the second oil pump 105 is in an available state. At this time, the battery power of the vehicle is smaller than or equal to the preset power value, which indicates that the battery power is insufficient, and the working mode of the hybrid vehicle will be switched to the range-extending mode or the fuel mode, that is, the engine 108 will be involved in working, in order to avoid the dry friction occurring when the engine 108 is started after the mode is switched, the engine 108 needs to be pre-lubricated, so that the second oil pump 105 is controlled to pump the lubricating oil in the oil pan 100 to the engine 108, so as to realize the pre-lubrication of the engine 108.

The battery level being greater than the predetermined level indicates that the battery level is sufficient, and the consumer is generally given priority to the electric mode when driving the hybrid vehicle, i.e., without the need for the engine 108 to intervene. However, to improve control accuracy, it may be further determined whether pre-lubrication of the engine 108 is required based on the engine off-time.

In this alternative embodiment, after the entire vehicle is powered on successfully, if the battery power of the vehicle is less than or equal to the preset power value, it is determined that the vehicle will switch to the range-extending mode or the fuel mode, that is, the engine 108 will be started to work, and then it is determined that the engine 108 needs to be pre-lubricated, so as to prevent dry friction when the engine 108 is started. Moreover, the time point of the engine 108 to be involved in the work can be accurately determined through the battery electric quantity, and the engine 108 is pre-lubricated only between the time of the engine 108 to be involved in the work, so that compared with the case that lubricating oil is always pumped into the engine 108 in the stop time of the engine 108, the power consumption of the second oil pump 105 is effectively reduced, and the system economy is improved.

Optionally, the controller is specifically further configured to:

judging whether the engine stop time is longer than or equal to a preset time;

if yes, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108, and pre-lubricating the engine 108 for a second period of time; if not, the second oil pump 105 is controlled to pump lubricating oil from the oil pan 100 to the engine 108 according to the vehicle gradient angle.

Specifically, the engine shutdown time being greater than or equal to the preset time indicates that the engine 108 is not operating for a long period of time, and the interior of the engine 108 is in an oil starved condition. The second oil pump 105 is thus controlled to pump the lubricating oil in the oil pan 100 to the engine 108, and pre-lubricate the engine 108 to realize that the engine 108 is in an oil-filled state.

The engine stop time being less than the preset time indicates that the engine 108 is stopped for a short period of time, and the engine 108 is still in an oil state at this time, so that pre-lubrication of the engine 108 is not needed temporarily. However, to improve control accuracy, it may be further determined whether pre-lubrication of the engine 108 is required based on the vehicle grade angle.

In this optional embodiment, whether the engine 108 is in the oil shortage state is determined by the engine stop time, and when the engine stop time is longer than or equal to the preset time, that is, when the engine 108 is in the oil shortage state, it is determined that the engine 108 needs to be pre-lubricated, and the second oil pump 105 is controlled to pump lubricating oil from the oil pan 100 to the engine 108, so that the engine 108 is always in the oil state, and dry friction is avoided when the engine 108 is suddenly started (for example, the vehicle working mode is manually switched to the range-extending mode or the fuel mode). And, only when the engine stop time exceeds the preset time, the pre-lubrication is carried out, and compared with the process that the lubricating oil is always pumped to the engine 108 in the engine 108 stop time, the power consumption of the second oil pump 105 is effectively reduced, and the system economy is improved.

Optionally, the controller is specifically further configured to:

judging whether the gradient angle of the vehicle is larger than or equal to a preset gradient value;

if yes, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108, and pre-lubricating the engine 108 for a third period of time; if not, the second oil pump 105 is controlled to pump lubricating oil from the oil pan 100 to the engine 108 according to the vehicle load.

Specifically, when the gradient angle of the vehicle is greater than or equal to the preset gradient angle, which indicates that the vehicle needs greater torque, the engine 108 is required to intervene to ensure the climbing capability of the vehicle, and to avoid dry friction when the engine 108 is started, the engine 108 needs to be pre-lubricated, so that the second oil pump 105 is controlled to pump the lubricating oil in the oil pan 100 to the engine 108 to realize pre-lubrication of the engine 108.

When the vehicle grade angle is less than the predetermined grade angle, this means that only motor operation is required to ensure that the vehicle is passing the grade without the intervention of the engine 108. However, to improve control accuracy, it may be further determined whether pre-lubrication of the engine 108 is required based on the vehicle load.

In this alternative embodiment, whether the engine 108 is needed is determined by the vehicle gradient angle, and when the engine 108 is needed, the second oil pump 105 is controlled in advance to pump the lubricating oil in the oil pan 100 to the engine 108, so as to implement pre-lubrication of the engine 108, and avoid dry friction when the engine 108 is started. Moreover, by accurately determining the timing at which the engine 108 is to be interposed, pre-lubrication is performed in advance only when the engine 108 is to be interposed, power consumption of the second oil pump 105 is effectively reduced and system economy is improved as compared with pumping lubricating oil to the engine 108 all the time during the shutdown time of the engine 108.

Optionally, the controller is specifically further configured to:

judging whether the vehicle load is greater than or equal to a preset load value;

if yes, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108, and pre-lubricating the engine 108 for a fourth period of time; if not, it indicates that the engine 108 does not need to be pre-lubricated.

Specifically, the vehicle load is greater than or equal to the preset load value, which indicates that the vehicle load is too heavy, and the engine 108 will intervene to increase the vehicle power, so that in order to avoid dry friction when the engine 108 is started, the engine 108 needs to be pre-lubricated, and thus the second oil pump 105 is controlled to pump the lubricating oil in the oil pan 100 to the engine 108, so as to implement pre-lubrication of the engine 108.

The vehicle load being less than the predetermined load value indicates that the vehicle load is light and that the power provided by the electric motor in the hybrid vehicle has been met, so that no intervention by the engine 108 is required and the engine 108 is pre-lubricated.

It will be appreciated that, to simplify the process, the vehicle load may be replaced by a vehicle preparation mass, i.e. the vehicle preparation mass is compared with a preset mass, and when the vehicle preparation mass is greater than or equal to the preset mass, it is determined that the engine 108 needs to be pre-lubricated, the second oil pump 105 is controlled to pump lubricating oil from the oil pan 100 to the engine 108; when the vehicle service mass is less than the preset mass, it is determined that the engine 108 does not need to be pre-lubricated.

In this alternative embodiment, whether the engine 108 is needed to be intervened is determined according to the vehicle load, and further whether the engine 108 needs to be pre-lubricated is determined, when the engine 108 is needed to be intervened, the second oil pump 105 is controlled in advance to pump the lubricating oil in the oil pan 100 to the engine 108, so as to realize pre-lubrication of the engine 108, and dry friction is avoided when the engine 108 is started. Moreover, by accurately determining the timing at which the engine 108 is to be interposed, pre-lubrication is performed in advance only when the engine 108 is to be interposed, power consumption of the second oil pump 105 is effectively reduced and system economy is improved as compared with pumping lubricating oil to the engine 108 all the time during the shutdown time of the engine 108.

Optionally, the first duration is positively correlated with the preset electrical quantity value; and/or, the second duration is positively correlated with the preset duration; and/or, the third duration is inversely related to the preset gradient value; and/or, the fourth duration is inversely related to the preset load value; and/or, the first duration, the second duration, the third duration, and the fourth duration are all inversely related to the lube oil temperature.

Specifically, the first time period, the second time period, the third time period, and the fourth time period may be the same or different.

When the battery power is smaller than or equal to the preset power value, the smaller the preset power value is, the smaller the remaining time for the vehicle working mode to be switched to the range-extending mode or the fuel mode is, and therefore the shorter the first duration for pre-lubrication is.

When the engine shutdown time period is greater than or equal to the preset time period, the longer the preset time period is, which means that the longer the engine 108 is stopped, the more the engine 108 is starved of oil, and thus the longer the second time period for pre-lubrication.

When the vehicle grade angle is greater than or equal to the preset grade value, the greater the preset grade value, which means that the greater the vehicle torque is required to ensure the vehicle climbing ability, the less time remains before the engine 108 is interposed, and therefore the shorter the third duration of pre-lubrication.

When the vehicle load is greater than or equal to the preset load value, the greater the preset load value, the more urgent the time to power the engine 108 is required, the more time remains before the engine 108 is interposed, and therefore the shorter the fourth duration of pre-lubrication.

Alternatively, the duration of pre-lubrication of engine 108 may be determined for different vehicle operating condition data, specifically in combination with the temperature of the lubricating oil.

Specifically, the lower the temperature of the lubricant, the higher the viscosity of the lubricant, so the pre-lubrication period can be appropriately prolonged to ensure rapid pressure build-up at the start of the engine 108.

As shown in fig. 3, when the power-on state of the whole vehicle indicates that the power-on of the whole vehicle is successful and the battery power is less than or equal to the preset power value, the pre-lubrication duration of the engine 108 may be T1. And when the battery electric quantity is larger than a preset electric quantity value, comprehensively judging the pre-lubrication time of the engine 108 according to the temperature of the lubricating oil, the engine stop time, the vehicle gradient angle and the vehicle load.

When the temperature of the lubricant is less than or equal to the preset temperature value, the pre-lubrication duration of the engine 108 corresponding to the engine shutdown duration being greater than or equal to the preset duration may be T2. When the engine off time is less than the predetermined time and the vehicle grade angle is greater than or equal to the predetermined grade value, the engine 108 pre-lubrication time may be T3. The engine off time is less than a predetermined time, the vehicle grade angle is less than the predetermined grade angle, and the engine 108 pre-lubrication time may be T4 when the vehicle load is greater than or equal to the predetermined load value. Wherein, T3 and T4 may be the same as the same-level pre-lubrication duration, making it the first-level duration.

When the temperature of the lubricating oil is greater than the preset temperature value, the pre-lubrication duration of the engine 108 corresponding to the engine shutdown duration being greater than or equal to the preset duration may be T5. When the engine off time is less than the predetermined time and the vehicle grade angle is greater than or equal to the predetermined grade value, the engine 108 pre-lubrication time may be T6. The engine off time is less than a predetermined time, the vehicle grade angle is less than the predetermined grade angle, and the engine 108 pre-lubrication time may be T7 when the vehicle load is greater than or equal to the predetermined load value. Wherein T5, T6 and T7 may be the same as the same level of pre-lubrication duration, making it the second level duration.

The first level duration may be greater than the second level duration, i.e., the lower the temperature of the lubrication oil, in the case of the same other vehicle operating condition data, the longer the pre-lubrication duration may be to ensure rapid pressure build up when the engine 108 is started. In practical applications, the temperature of the lubricating oil may be determined by the temperature detected by the electric oil pump.

Optionally, the engine lubrication system further comprises a lube oil suction filter 101, a first check valve 103 and a second check valve 102;

the first port of the first oil pump 104 is communicated with the oil pan 100 through the lubricating oil suction filter 101, the first one-way valve 103 is arranged between the first port of the first oil pump 104 and the lubricating oil suction filter 101, and the first one-way valve 103 is in one-way conduction from the lubricating oil suction filter 101 to the first oil pump 104;

the first port of the second oil pump 105 is communicated with the oil pan 100 through the oil suction filter 101, the second check valve 102 is disposed between the first port of the second oil pump 105 and the oil suction filter 101, and the second check valve 102 is unidirectional from the oil suction filter 101 to the second oil pump 105.

In this alternative embodiment, the first check valve 103 can ensure that the second oil pump 105 does not suck air through the first oil pump 104 when working, and the second check valve 102 can ensure that the first oil pump 104 does not suck air through the second oil pump 105 when working.

Optionally, the engine lubrication system further comprises a third check valve 106 and a fourth check valve 107;

the third check valve 106 is disposed between the second port of the first oil pump 104 and the engine 108, and the third check valve 106 is in unidirectional conduction from the first oil pump 104 to the engine 108;

the fourth check valve 107 is disposed between the second port of the second oil pump 105 and the engine 108, and the fourth check valve 107 is in one-way conduction from the second oil pump 105 to the engine 108.

In this alternative embodiment, the third check valve 106 can prevent the lubricant pumped by the second oil pump 105 from flowing back to the first oil pump 104, and the fourth check valve 107 can prevent the lubricant pumped by the first oil pump 104 from flowing back to the second oil pump 105.

As shown in fig. 4, a control method of an engine lubrication system according to an embodiment of the present invention is applied to the engine lubrication system described above, and the control method of the engine lubrication system includes:

s100, acquiring vehicle working condition data, wherein the vehicle working condition data comprises at least one of a whole vehicle power-on state, a vehicle gradient angle, a vehicle load, a battery electric quantity and an engine stop time;

s200, before the engine 108 is started, judging whether the second oil pump 105 needs to be controlled to pre-lubricate the engine 108 according to the vehicle working condition data, and controlling the second oil pump 105 according to a judging result;

s300, when the engine 108 is started, controlling the first oil pump 104 to pump lubricating oil from the oil pan 100 to the engine 108.

The control method of the present embodiment is directed to the control method of the engine lubrication system, and the advantages of the control method are the same as those of the engine lubrication system in the prior art, and are not described herein.

Optionally, the controlling the second oil pump 105 according to the determination result includes:

when it is determined that the second oil pump 105 needs to be controlled to pre-lubricate the engine 108, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108;

when it is determined that it is not necessary to control the second oil pump 105 to pre-lubricate the engine 108, the second oil pump 105 is not started.

Optionally, the determining whether the second oil pump 105 needs to be controlled to pre-lubricate the engine 108 according to the vehicle working condition data, and controlling the second oil pump 105 according to the determination result includes:

when the whole vehicle electrifying state shows that the vehicle electrifying is successful, judging whether the battery electric quantity of the vehicle is smaller than or equal to a preset electric quantity value;

if yes, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108, and pre-lubricating the engine 108 for a first period of time; if not, the second oil pump 105 is controlled to pump lubricating oil from the oil pan 100 to the engine 108 according to the engine stop time period.

Optionally, the controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108 according to the engine-off time period includes:

judging whether the engine stop time is longer than or equal to a preset time;

if yes, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108, and pre-lubricating the engine 108 for a second period of time; if not, the second oil pump 105 is controlled to pump lubricating oil from the oil pan 100 to the engine 108 according to the vehicle gradient angle.

Optionally, the controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108 according to the vehicle gradient angle includes:

judging whether the gradient angle of the vehicle is larger than or equal to a preset gradient value;

if yes, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108, and pre-lubricating the engine 108 for a third period of time; if not, the second oil pump 105 is controlled to pump lubricating oil from the oil pan 100 to the engine 108 according to the vehicle load.

Optionally, the controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108 according to the vehicle load includes:

judging whether the vehicle load is greater than or equal to a preset load value;

if yes, controlling the second oil pump 105 to pump lubricating oil from the oil pan 100 to the engine 108, and pre-lubricating the engine 108 for a fourth period of time; if not, it indicates that the engine 108 does not need to be pre-lubricated.

Optionally, the first duration is positively correlated with the preset electrical quantity value; and/or, the second duration is positively correlated with the preset duration; and/or, the third duration is inversely related to the preset gradient value; and/or, the fourth duration is inversely related to the preset load value; and/or, the first duration, the second duration, the third duration, and the fourth duration are all inversely related to the lube oil temperature.

An electronic device provided in another embodiment of the present invention includes a memory and a processor; the memory is used for storing a computer program; the processor is configured to implement the control method of the engine lubrication system as described above when executing the computer program.

A further embodiment of the invention provides a vehicle comprising an engine lubrication system as described above.

An electronic device that can be a server or a client of the present invention will now be described, which is an example of a hardware device that can be applied to aspects of the present invention. Electronic devices are intended to represent various forms of digital electronic computer devices, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.

The electronic device includes a computing unit that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM) or a computer program loaded from a storage unit into a Random Access Memory (RAM). In the RAM, various programs and data required for the operation of the device may also be stored. The computing unit, ROM and RAM are connected to each other by a bus. An input/output (I/O) interface is also connected to the bus.

Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like. In this application, the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment of the present invention. In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

Although the invention is disclosed above, the scope of the invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.

Claims (10)

1. An engine lubrication system, comprising:

an oil pan (100) for storing lubricating oil;

a first oil pump (104), a first port of the first oil pump (104) being in communication with the oil pan (100), a second port of the first oil pump (104) being for communication with an engine (108);

-a second oil pump (105), a first port of the second oil pump (105) being in communication with the oil pan (100), a second port of the second oil pump (105) being for communication with the engine (108);

the controller is electrically connected with the first oil pump (104) and the second oil pump (105) respectively, and is configured to judge whether the second oil pump (105) needs to be controlled to pre-lubricate the engine (108) according to vehicle working condition data before the engine (108) is started, control the second oil pump (105) according to a judgment result, and control the first oil pump (104) to pump lubricating oil from the oil pan (100) to the engine (108) when the engine (108) is started;

the vehicle working condition data comprises at least one of a whole vehicle power-on state, a vehicle gradient angle, a vehicle load, a battery electric quantity and an engine stop time.

2. The engine lubrication system according to claim 1, wherein the controller is specifically configured to:

-controlling the second oil pump (105) to pump lubricating oil from the oil pan (100) to the engine (108) when it is determined that the second oil pump (105) needs to be controlled to pre-lubricate the engine (108);

when it is determined that it is not necessary to control the second oil pump (105) to pre-lubricate the engine (108), the second oil pump (105) is not started.

3. The engine lubrication system according to claim 1, wherein the controller is specifically configured to:

when the whole vehicle electrifying state shows that the vehicle electrifying is successful, judging whether the battery electric quantity of the vehicle is smaller than or equal to a preset electric quantity value;

if yes, controlling the second oil pump (105) to pump lubricating oil from the oil pan (100) to the engine (108), and pre-lubricating the engine (108) for a first duration; if not, controlling the second oil pump (105) to pump lubricating oil from the oil pan (100) to the engine (108) according to the engine stop time.

4. The engine lubrication system according to claim 3, wherein the controller is further specifically configured to:

judging whether the engine stop time is longer than or equal to a preset time;

if yes, controlling the second oil pump (105) to pump lubricating oil from the oil pan (100) to the engine (108), and pre-lubricating the engine (108) for a second period of time; if not, the second oil pump (105) is controlled to pump lubricating oil from the oil pan (100) to the engine (108) according to the vehicle gradient angle.

5. The engine lubrication system according to claim 4, wherein the controller is further specifically configured to:

judging whether the gradient angle of the vehicle is larger than or equal to a preset gradient value;

if yes, controlling the second oil pump (105) to pump lubricating oil from the oil pan (100) to the engine (108), and pre-lubricating the engine (108) for a third duration; if not, the second oil pump (105) is controlled to pump lubricating oil from the oil pan (100) to the engine (108) according to the vehicle load.

6. The engine lubrication system according to claim 5, wherein the controller is further specifically configured to:

judging whether the vehicle load is greater than or equal to a preset load value;

if yes, controlling the second oil pump (105) to pump lubricating oil from the oil pan (100) to the engine (108), and pre-lubricating the engine (108) for a fourth period of time; if not, it is indicated that the engine (108) does not need to be pre-lubricated.

7. The engine lubrication system according to claim 6, wherein the first time period is positively correlated with the preset electrical quantity value; and/or, the second duration is positively correlated with the preset duration; and/or, the third duration is inversely related to the preset gradient value; and/or, the fourth duration is inversely related to the preset load value; and/or, the first duration, the second duration, the third duration, and the fourth duration are all inversely related to the lube oil temperature.

8. The engine lubrication system according to any one of claims 1 to 6, further comprising a lube oil suction filter (101), a first check valve (103) and a second check valve (102);

the first port of the first oil pump (104) is communicated with the oil pan (100) through the lubricating oil suction filter (101), the first one-way valve (103) is arranged between the first port of the first oil pump (104) and the lubricating oil suction filter (101), and the first one-way valve (103) is in one-way conduction from the lubricating oil suction filter (101) to the first oil pump (104);

the first port of the second oil pump (105) is communicated with the oil pan (100) through the lubricating oil suction filter (101), the second one-way valve (102) is arranged between the first port of the second oil pump (105) and the lubricating oil suction filter (101), and the second one-way valve (102) is in one-way conduction from the lubricating oil suction filter (101) to the second oil pump (105).

9. The engine lubrication system according to any one of claims 1 to 6, further comprising a third check valve (106) and a fourth check valve (107);

the third one-way valve (106) is arranged between the second port of the first oil pump (104) and the engine (108), and the third one-way valve (106) is in one-way conduction from the first oil pump (104) to the engine (108);

the fourth one-way valve (107) is disposed between the second port of the second oil pump (105) and the engine (108), and the fourth one-way valve (107) is in one-way conduction from the second oil pump (105) to the engine (108).

10. A control method of an engine lubrication system according to any one of claims 1 to 9, characterized by being applied to the engine lubrication system, comprising:

acquiring vehicle working condition data, wherein the vehicle working condition data comprises at least one of a whole vehicle power-on state, a vehicle gradient angle, a vehicle load, a battery electric quantity and an engine stop time;

before an engine (108) is started, judging whether a second oil pump (105) needs to be controlled to pre-lubricate the engine (108) according to vehicle working condition data, and controlling the second oil pump (105) according to a judging result;

when the engine (108) is started, a first oil pump (104) is controlled to pump lubricating oil from the oil pan (100) to the engine (108).