CN114738074A - Control method and device for variable-flow engine oil pump, vehicle and storage medium - Google Patents

Abstract

The invention relates to the technical field of vehicles, and particularly discloses a control method and a control device of a variable flow engine oil pump, a vehicle and a storage medium, wherein the control method of the variable flow engine oil pump obtains the rotating speed and the torque of an engine; determining a target oil pressure based on the rotational speed and the torque; obtaining the temperature of engine oil; determining a target opening degree of a variable flow oil pump based on the target oil pressure and the oil temperature; the influence of temperature factors on the opening degree of the variable-flow oil pump is considered, the value of the target opening degree can be ensured to have higher precision, and then the variable-flow oil pump operates at the target opening degree; acquiring actual engine oil pressure; correcting the target opening degree based on the actual oil pressure and the target oil pressure so that the actual oil pressure is equal to the target oil pressure. Because the target opening degree has higher precision, only a small amount of correction is needed during correction, the large fluctuation of the engine oil pressure can be avoided, and the engine is protected.

Description

A control method, device, vehicle and storage medium for a variable flow oil pump

technical field

The present invention relates to the technical field of vehicles, and in particular, to a control method, device, vehicle and storage medium for a variable flow oil pump.

Background technique

The variable displacement oil pump control can continuously change the oil volume of the oil pump according to the oil pressure requirements of various engine parts under different speed, temperature, load and other conditions, making the control more refined and realizing complete on-demand distribution, thereby It avoids the oil loss of the traditional fixed displacement oil pump in the full speed range, which can effectively reduce friction and fuel consumption.

In the prior art, for the displacement control of the variable displacement oil pump, an oil pressure sensor is usually set on the main oil passage of the engine, and the target oil pressure is preset in the ECU (Electronic Control Unit, electronic controller unit). When the pressure sensor detects that the deviation between the main oil passage oil pressure and the ECU preset target oil pressure exceeds a certain limit, the oil pump displacement is controlled by adjusting the oil pump duty cycle, and the closed-loop control of the engine main oil passage oil pressure reaches the target pressure. However, this control method does not consider the effect of temperature on the oil. For example, when the engine is in a cold start state, because the oil temperature is too low, it is easy to cause a large fluctuation of the oil pressure, which will cause the engine to stop suddenly due to the oil pressure exceeding the limit value. , will cause certain damage to the engine.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a control method, device, vehicle and storage medium for a variable flow oil pump, so as to solve the problem that the temperature of the oil pressure is not considered when the displacement of the variable displacement oil pump is controlled in the related art. Volatility issues.

The present invention provides a control method for a variable flow oil pump, and the control method for the variable flow oil pump includes:

Get the speed and torque of the engine;

determining a target oil pressure based on the rotational speed and the torque;

Get the oil temperature;

determining a target opening of a variable flow oil pump based on the target oil pressure and the oil temperature;

The variable flow oil pump operates at the target opening;

Get the actual oil pressure;

The target opening is corrected based on the actual oil pressure and the target oil pressure so that the actual oil pressure is equal to the target oil pressure.

As a preferred technical solution of the control method for a variable flow oil pump, determining the target oil pressure based on the rotational speed and the torque includes:

Obtain the relationship diagram of speed, torque and target oil pressure;

A corresponding target oil pressure is queried from the relational graph based on the rotational speed and the torque.

As a preferred technical solution of the control method for the variable flow oil pump, determining the target opening degree of the variable flow oil pump based on the target oil pressure and the oil temperature includes:

Obtain the relationship between target oil pressure, oil temperature and target opening;

The target opening degree is determined according to the target oil pressure, the oil temperature, and the correlation.

As a preferred technical solution of the control method for a variable flow oil pump, correcting the target opening degree based on the actual oil pressure and the target oil pressure to make the actual oil pressure equal to the target oil pressure includes:

Cyclic comparison of the actual oil pressure and the target oil pressure;

If the actual oil pressure is greater than the standard oil pressure, updating the value of the target opening to a value obtained by reducing the first set value on the basis of the target opening;

If the actual oil pressure is lower than the standard oil pressure, updating the value of the target opening degree to a value obtained by adding a second set value on the basis of the target opening degree;

If the actual oil pressure is equal to the standard oil pressure, the value of the target opening remains unchanged.

The present invention also provides a control device for a variable flow oil pump, comprising:

The parameter acquisition module is used to acquire the speed and torque of the engine;

a target oil pressure determination module for determining a target oil pressure based on the rotational speed and the torque;

The oil temperature acquisition unit is used to acquire the oil temperature;

a target opening degree determination module, configured to determine a target opening degree of the variable flow oil pump based on the target oil pressure and the oil temperature;

The execution unit is used to make the variable flow oil pump operate at the target opening degree;

The pressure acquisition unit is used to acquire the actual oil pressure;

A correction module, configured to correct the target opening degree based on the actual oil pressure and the target oil pressure so that the actual oil pressure is equal to the target oil pressure.

As a preferred technical solution of a control device for a variable flow oil pump, the target oil pressure determination module includes:

The relationship diagram acquisition unit is used to acquire the relationship diagram of speed, torque and target oil pressure;

A query unit, configured to query the corresponding target oil pressure from the relational graph based on the rotational speed and the torque.

As a preferred technical solution of the control device for the variable flow oil pump, the target opening degree determination module includes:

The association relationship obtaining unit is used to obtain the association relationship between the target oil pressure, the oil temperature and the target opening degree;

A target opening degree determination unit, configured to determine the target opening degree according to the target oil pressure, the oil temperature and the correlation.

As a preferred technical solution for the control device of the variable flow oil pump, the correction module includes:

a cycle comparison unit for comparing the actual oil pressure and the target oil pressure;

a first updating unit, configured to update the value of the target opening degree to a value obtained by reducing the first set value on the basis of the target opening degree when the actual oil pressure is greater than the standard oil pressure ;

a second updating unit, configured to update the value of the target opening degree to a value obtained by adding a second set value on the basis of the target opening degree when the actual oil pressure is lower than the standard oil pressure;

A holding unit, when the actual oil pressure is equal to the target oil pressure, is used to keep the value of the target opening unchanged.

The present invention also provides a vehicle, comprising an engine and a variable flow oil pump, further comprising:

driving controller;

a rotational speed sensor for detecting the rotational speed of the engine and sending the rotational speed to the driving controller;

a torque sensor for detecting the torque of the engine and sending the torque to the driving controller;

a temperature sensor for detecting the temperature of the oil and sending the temperature of the oil to the driving controller;

a pressure sensor for detecting the actual oil pressure of the oil, and sending the actual oil pressure to the driving controller;

memory for storing one or more programs;

When the one or more programs are executed by the on-board controller, the on-board controller is made to control the vehicle to implement the method for controlling a variable flow oil pump as described in any of the above solutions.

The present invention also provides a storage medium on which a computer program is stored, and when the program is executed by the driving controller, the vehicle implements the control method for a variable flow oil pump as described in any of the above solutions.

The beneficial effects of the present invention are:

The present invention provides a control method, device, vehicle and storage medium for a variable flow oil pump. The control method for a variable flow oil pump obtains the rotational speed and torque of an engine; and determines a target oil pressure based on the rotational speed and the torque ; obtain oil temperature; determine the target opening degree of the variable flow oil pump based on the target oil pressure and the oil temperature; the variable flow oil pump operates at the target opening degree; obtain the actual oil pressure; based on the actual oil pressure and The target oil pressure corrects the target opening degree so that the actual oil pressure is equal to the target oil pressure. When determining the target opening degree, the influence of temperature factors on the opening degree of the variable flow oil pump is fully considered, so as to ensure that the determined target opening degree of the variable flow oil pump has high accuracy. When the target opening of the oil pump is corrected, only a small amount needs to be corrected, which can avoid large fluctuations in the oil pressure and thus protect the engine.

Description of drawings

FIG. 1 is a flow chart 1 of a control method of a variable flow oil pump in an embodiment of the present invention;

Fig. 2 is the second flow chart of the control method of the variable flow oil pump in the embodiment of the present invention;

3 is a schematic structural diagram of a control device for a variable flow oil pump in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a vehicle in an embodiment of the present invention.

In the picture:

300, a parameter acquisition module; 310, a target oil pressure determination module; 320, an oil temperature acquisition unit; 330, a target opening degree determination module; 340, an execution unit; 350, a pressure acquisition unit; 360, a correction module;

400, engine; 410, variable flow oil pump; 420, driving controller; 430, rotational speed sensor; 440, torque sensor; 450, temperature sensor; 460, pressure sensor; 470, memory.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance. Wherein, the terms "first position" and "second position" are two different positions, and the first feature being "above", "over" and "above" the second feature includes the first feature being "over" the second feature Directly above and diagonally above, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

Example 1

In the prior art, for the displacement control of the variable displacement oil pump, an oil pressure sensor is usually set on the main oil passage of the engine, and the target oil pressure is preset in the ECU. When the deviation of the preset target oil pressure of the ECU exceeds a certain limit, the displacement of the oil pump is controlled by adjusting the duty ratio of the oil pump, and the closed-loop control of the oil pressure of the main oil passage of the engine reaches the target pressure. However, this control method does not consider the effect of temperature on the oil. For example, when the engine is in a cold start state, because the oil temperature is too low, it is easy to cause a large fluctuation of the oil pressure, which will cause the engine to stop suddenly due to the oil pressure exceeding the limit value. , will cause certain damage to the engine.

In this regard, this embodiment provides a control method for a variable flow oil pump, which fully considers the influence of temperature factors on oil pressure, avoids pressure fluctuations, and can ensure adjustment accuracy. The control method of the variable flow oil pump can be implemented by a control device of the variable flow oil pump, the control device of the variable flow oil pump can be realized by means of software and/or hardware, and integrated in the vehicle, specifically, As shown in FIG. 1 , the control method of the variable flow oil pump includes the following steps.

S100: Get the speed and torque of the engine.

The rotational speed of the engine can be detected by a rotational speed sensor, and the torque output by the engine can be detected by a torque sensor.

S110: Determine the target oil pressure based on the rotational speed and the torque.

Under different working conditions of the engine, it is necessary to match different oil pressures so that various components in the engine can be fully lubricated. Among them, different working conditions of the engine can be displayed by the speed of the engine and the torque of the engine, and then the lower target oil pressure can be determined according to a preset relationship diagram or relationship.

S120: Obtain the oil temperature.

The oil temperature of the oil can be detected by a temperature sensor.

S130: Determine the target opening degree of the variable flow oil pump based on the target oil pressure and the oil temperature.

At different oil temperatures, the viscosity of the oil is different. For example, when the temperature is low, the viscosity of the oil is relatively high, and the oil resistance is large, while the viscosity of the oil is small at high temperature, and the oil resistance is relatively high. Therefore, when the oil pressure is constant and the amount of oil required by the engine is constant, the target opening of the variable flow oil pump is different at different temperatures. Therefore, by determining the target opening degree of the variable flow oil pump by the target oil pressure and oil temperature, the influence of temperature factors on the engine oil supply can be fully considered, and the target opening degree of the variable flow oil pump can be ensured with high accuracy.

S140: The variable flow oil pump operates at the target opening.

S150: Obtain the actual oil pressure.

S160: The target opening is corrected based on the actual oil pressure and the target oil pressure so that the actual oil pressure is equal to the target oil pressure.

It can be understood that when the variable flow oil pump operates at the target opening, the actual oil pressure of the oil may be different from the target oil pressure, but even if there is a difference, the difference is very small, and in order to make the actual oil pressure It is equal to the target oil pressure, and the amount of correction for the target opening is also small, so as to avoid large fluctuations in the oil pressure and protect the engine.

The method for controlling a variable flow oil pump provided by this embodiment is: by acquiring the rotational speed and torque of the engine; determining a target oil pressure based on the rotational speed and the torque; acquiring an oil temperature; based on the target oil pressure and the oil temperature A target opening degree of the variable flow oil pump is determined; the variable flow oil pump operates at the target opening degree; an actual oil pressure is obtained; the target opening degree is corrected based on the actual oil pressure and the target oil pressure so that the actual oil pressure The oil pressure is equal to the target oil pressure. When determining the target opening degree, the influence of temperature factors on the opening degree of the variable flow oil pump is fully considered, so as to ensure that the determined target opening degree of the variable flow oil pump has high accuracy. When the target opening of the oil pump is corrected, only a small amount needs to be corrected, which can avoid large fluctuations in the oil pressure and thus protect the engine.

Embodiment 2

As shown in FIG. 2 , the present embodiment provides a control method for a variable flow oil pump. The control method for the variable flow oil pump is embodied on the basis of the above-mentioned embodiment. The control method of the variable flow oil pump The method includes the following steps.

S200: Get the speed and torque of the engine.

S210: Determine the target oil pressure based on the rotational speed and the torque.

Specifically, the determination of the target oil pressure based on the rotational speed and the torque in this embodiment includes the following steps S211 and S212.

S211: Obtain a relational graph of rotational speed, torque and target oil pressure.

Among them, the relationship map of speed, torque and target oil pressure can be obtained through a large number of experiments in the early stage and stored in the driving controller.

S212: Query the corresponding target oil pressure from the relational graph based on the rotational speed and the torque.

S220: Obtain the oil temperature.

S230: Determine the target opening degree of the variable flow oil pump based on the target oil pressure and the oil temperature.

Specifically, in this embodiment, determining the target opening degree of the variable flow oil pump based on the target oil pressure and the oil temperature includes the following steps S231 and S232.

S231 : Obtain the relationship between the target oil pressure, the oil temperature, and the target opening.

Among them, the relationship between target oil pressure, oil temperature and target opening can be obtained through a large number of experiments in the early stage and stored in the driving controller.

S232: Determine the target opening degree according to the target oil pressure, the oil temperature and the correlation.

According to the obtained target oil pressure and oil temperature, the corresponding target opening degree can be queried from the relationship.

S240: The variable flow oil pump operates at the target opening.

S250: Get the actual oil pressure.

S260: The target opening is corrected based on the actual oil pressure and the target oil pressure so that the actual oil pressure is equal to the target oil pressure.

Correcting the target opening based on the actual oil pressure and the target oil pressure to make the actual oil pressure equal to the target oil pressure includes:

S261: Compare the actual oil pressure and the target oil pressure;

If the actual oil pressure is greater than the standard oil pressure, execute S262; if the actual oil pressure is less than the standard oil pressure, execute S263; if the actual oil pressure is equal to the target oil pressure, execute S264.

S262: Update the value of the target opening degree to a value obtained by reducing the first set value based on the target opening degree.

S263: Update the value of the target opening degree to a value obtained by adding the second set value to the target opening degree.

S264: The value of the target opening remains unchanged.

Wherein, both the first set value and the second set value can be set as required. It should be noted that the actual oil pressure in this implementation is equal to the target oil pressure, which means that the value of the actual oil pressure is completely equal to the value of the target oil pressure, or the ratio of the value of the actual oil pressure to the value of the target oil pressure is within a set value. The setting range is very small, for example, the setting range can be 0.995～1.005.

After steps S262, S263 and S264, S261 is repeatedly executed, so that PID adjustment of the target opening can be realized.

In other embodiments, step S260 may further include the following steps:

Obtain the map of actual oil pressure and target oil pressure and target opening;

Based on the actual oil pressure and the target oil pressure, the corresponding target opening is queried from the map, and the original target opening is replaced by the target opening obtained by the query. In this way, there is no need to repeat the cyclic process, but the control accuracy is relatively poor compared to PID control.

In the method for controlling a variable flow oil pump provided by the second embodiment of the present invention, on the basis of the above-mentioned embodiment, the corresponding target oil pressure is queried from a relational graph based on the rotational speed and torque, and is determined according to the target oil pressure, the oil temperature and the correlation relationship. target opening. The target opening is adjusted by PID based on the actual oil pressure and the target oil pressure, and finally the actual oil pressure is equal to the target oil pressure. The method is simple, reliable and low in cost.

Embodiment 3

As shown in FIG. 3 , the present embodiment provides a control device for a variable flow oil pump, and the control device for a variable flow oil pump is used to execute the above-mentioned control method for a variable flow oil pump. The oil pump control device includes a parameter acquisition module 300 , a target oil pressure determination module 310 , an oil temperature acquisition unit 320 , a target opening degree determination module 330 , an execution unit 340 , a pressure acquisition unit 350 and a correction module 360 .

Wherein, the parameter acquisition module 300 is used to acquire the rotational speed and torque of the engine; the target oil pressure determination module 310 is used to determine the target oil pressure based on the rotational speed and the torque; the oil temperature acquisition unit 320 is used to acquire the oil temperature; the target opening determination module 330 is used for The target opening degree of the variable flow oil pump is determined based on the target oil pressure and the oil temperature; the execution unit 340 is used to make the variable flow oil pump operate at the target opening degree; the pressure obtaining unit 350 is used to obtain the actual oil pressure; the correction module 360 Used to correct the target opening based on the actual oil pressure and the target oil pressure so that the actual oil pressure is equal to the target oil pressure.

Specifically, the target oil pressure determination module 310 includes a relationship graph acquisition unit and a query unit. Wherein, the relationship diagram obtaining unit is used for obtaining the relationship diagram of speed, torque and target oil pressure; the query unit is used for querying the corresponding target oil pressure from the relationship diagram based on the speed and torque.

The target opening degree determination module 330 includes an association relationship acquisition unit and a target opening degree determination unit. The correlation obtaining unit is used to obtain the correlation between the target oil pressure, the oil temperature and the target opening; the target opening determining unit is used to determine the target opening according to the target oil pressure, the oil temperature and the correlation.

The correction module 360 includes a cycle comparison unit, a first update unit, a second update unit and a hold unit. Wherein, the cycle comparison unit is used to compare the actual oil pressure and the target oil pressure; when the actual oil pressure is greater than the standard oil pressure, the first update unit is used to update the value of the target opening to reduce the value of the target opening. When the actual oil pressure is lower than the standard oil pressure, the second updating unit is used to update the value of the target opening to the value after adding the second setting value on the basis of the target opening ;When the actual oil pressure is equal to the target oil pressure, the value used by the hold unit to keep the target opening unchanged.

In the control device for a variable flow oil pump provided by this embodiment, the rotational speed and torque of the engine are obtained through the parameter acquisition module 300; the target oil pressure is determined based on the rotational speed and torque through the target oil pressure determination module 310; the oil is obtained through the oil temperature obtaining unit 320 temperature; the target opening degree determination module 330 determines the target opening degree of the variable flow oil pump based on the target oil pressure and the oil temperature; the variable flow oil pump is operated at the target opening degree through the execution unit 340 ; the actual opening degree is obtained through the pressure obtaining unit 350 Oil pressure; the target opening is corrected by the correction module 360 based on the actual oil pressure and the target oil pressure to make the actual oil pressure equal to the target oil pressure. When determining the target opening degree, the influence of temperature factors on the opening degree of the variable flow oil pump is fully considered, so as to ensure that the determined target opening degree of the variable flow oil pump has high accuracy. When correcting the target opening, only a small amount needs to be corrected, which can avoid large fluctuations in oil pressure and protect the engine.

Embodiment 4

As shown in FIG. 4 , this embodiment provides a vehicle, specifically, the vehicle includes an engine 400 and a variable flow oil pump 410 , the vehicle further includes a driving controller 420 , a rotational speed sensor 430 , a torque sensor 440 , and a temperature sensor 450 , pressure sensor 460 and memory 470 . The engine 400 , the variable flow oil pump 410 , the driving controller 420 , the rotational speed sensor 430 , the torque sensor 440 , the temperature sensor 450 , the pressure sensor 460 and the memory 470 can be connected through a bus. The rotational speed sensor 430 is used to detect the rotational speed of the engine 400 and send the rotational speed to the driving controller 420; the torque sensor 440 is used to detect the torque of the engine 400 and send the torque to the driving controller 420; the temperature sensor 450 is used to detect the oil temperature , and send the oil temperature to the driving controller 420 ; the pressure sensor 460 is used to detect the actual oil pressure of the oil, and send the actual oil pressure to the driving controller 420 .

As a computer-readable storage medium, the memory 470 can be used to store software programs, computer-executable programs and modules, such as program instructions/modules corresponding to the control method of the variable flow oil pump in the embodiment of the present invention. The driving controller executes various functional applications and data processing of the vehicle by running the software programs, instructions and modules stored in the memory 470 , that is, to implement the control method of the variable flow oil pump of the above-mentioned embodiment.

The memory 470 mainly includes a stored program area and a stored data area, wherein the stored program area can store an operating system, an application program required for at least one function; the stored data area can store data created according to the use of the terminal and the like. Additionally, memory 470 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 470 may further include memory 470 located remotely with respect to the trip controller 420, and these remote memories 470 may be connected to the vehicle through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

The vehicle provided by the fourth embodiment of the present invention and the control method of the variable flow oil pump provided by the above-mentioned embodiments belong to the same inventive concept. For the technical details not described in detail in this embodiment, please refer to the above-mentioned embodiments, and this embodiment has the ability to execute The same beneficial effect as the control method of the variable flow oil pump.

Embodiment 5

Embodiment 5 of the present invention further provides a storage medium on which a computer program is stored, and when the program is executed by a driving controller, implements the control method for a variable flow oil pump according to the foregoing embodiments of the present invention.

Certainly, a storage medium containing computer-executable instructions provided by the embodiments of the present invention, the computer-executable instructions of which are not limited to the operations in the above-mentioned control method for a variable flow oil pump, but can also execute the embodiments of the present invention Relevant operations in the provided control method for a variable flow oil pump have corresponding functions and beneficial effects.

From the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be realized by software and necessary general-purpose hardware, and of course can also be realized by hardware, but in many cases the former is a better embodiment . Based on such understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in a computer-readable storage medium, such as a floppy disk of a computer , read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including several instructions to make a computer equipment (which can be a robot, a personal A computer, a server, or a network device, etc.) executes the control method for a variable flow oil pump described in various embodiments of the present invention.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A method of controlling a variable flow engine oil pump, comprising:

acquiring the rotating speed and the torque of an engine;

determining a target oil pressure based on the rotational speed and the torque;

obtaining the temperature of engine oil;

determining a target opening degree of a variable flow oil pump based on the target oil pressure and the oil temperature;

the variable flow oil pump operates at a target opening degree;

acquiring actual engine oil pressure;

correcting the target opening degree based on the actual oil pressure and the target oil pressure so that the actual oil pressure is equal to the target oil pressure.

2. The method of controlling a variable flowrate oil pump of claim 1, wherein determining a target oil pressure based on the rotational speed and the torque comprises:

obtaining a relation graph of the rotating speed, the torque and the target oil pressure;

and inquiring corresponding target engine oil pressure from the relation graph based on the rotating speed and the torque.

3. The control method of the variable flow oil pump according to claim 1, wherein determining the target opening degree of the variable flow oil pump based on the target oil pressure and the oil temperature includes:

acquiring the incidence relation among target engine oil pressure, engine oil temperature and target opening;

and determining the target opening according to the target engine oil pressure, the engine oil temperature and the incidence relation.

4. The method of controlling a variable flow pump according to claim 1, wherein correcting the target opening degree based on the actual oil pressure and the target oil pressure so that the actual oil pressure is equal to the target oil pressure comprises:

circularly comparing the actual oil pressure with the target oil pressure;

if the actual engine oil pressure is larger than the engine oil pressure of the marking machine, updating the value of the target opening to a value which is reduced by a first set value on the basis of the target opening;

if the actual engine oil pressure is smaller than the engine oil pressure of the marking machine, updating the value of the target opening to a value obtained by adding a second set value on the basis of the target opening;

and if the actual engine oil pressure is equal to the engine oil pressure, keeping the value of the target opening unchanged.

5. A control device for a variable-flow oil pump, comprising:

the parameter acquisition module is used for acquiring the rotating speed and the torque of the engine;

a target oil pressure determination module to determine a target oil pressure based on the rotational speed and the torque;

the engine oil temperature acquisition unit is used for acquiring the engine oil temperature;

a target opening determination module for determining a target opening of a variable flow oil pump based on the target oil pressure and the oil temperature;

an execution unit configured to cause the variable-flow oil pump to operate at a target opening degree;

a pressure acquisition unit for acquiring an actual oil pressure;

and the correction module is used for correcting the target opening based on the actual oil pressure and the target oil pressure so that the actual oil pressure is equal to the target oil pressure.

6. The control apparatus for the variable flow oil pump according to claim 5, wherein the target oil pressure determination module includes:

the relation graph acquiring unit is used for acquiring a relation graph of the rotating speed, the torque and the target oil pressure;

and the query unit is used for querying the corresponding target oil pressure from the relation graph based on the rotating speed and the torque.

7. The control apparatus of the variable flow oil pump according to claim 5, wherein the target opening degree determination module includes:

the incidence relation acquisition unit is used for acquiring the incidence relation among the target oil pressure, the oil temperature and the target opening;

and the target opening determining unit is used for determining the target opening according to the target oil pressure, the oil temperature and the incidence relation.

8. The control device for the variable-flow oil pump according to claim 5, wherein the correction module includes:

the circulation comparison unit is used for comparing the actual engine oil pressure with the target engine oil pressure;

a first updating unit configured to update the target opening to a value obtained by reducing a first set value on the basis of the target opening when the actual oil pressure is greater than the marker oil pressure;

the second updating unit is used for updating the value of the target opening to a value obtained by adding a second set value on the basis of the target opening when the actual engine oil pressure is smaller than the engine oil pressure of the marking machine;

and the holding unit is used for keeping the value of the target opening unchanged when the actual engine oil pressure is equal to the standard engine oil pressure.

9. A vehicle including an engine and a variable flow oil pump, characterized by further comprising:

a vehicle controller;

the rotating speed sensor is used for detecting the rotating speed of the engine and sending the rotating speed to the travelling crane controller;

the torque sensor is used for detecting the torque of the engine and sending the torque to the driving controller;

the temperature sensor is used for detecting the temperature of the engine oil and sending the temperature of the engine oil to the driving controller;

the pressure sensor is used for detecting the actual oil pressure of the engine oil and sending the actual oil pressure to the driving controller;

a memory for storing one or more programs;

the one or more programs, when executed by the locomotive controller, cause the locomotive controller to control a vehicle to implement the control method of the variable flow oil pump of any of claims 1-4.

10. A storage medium having stored thereon a computer program, characterized in that when the program is executed by a vehicle controller, the vehicle implements the control method of the variable flow rate oil pump according to any one of claims 1 to 4.

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