Control method of electric pump, computer program product and electronic device

Abstract

The invention provides an electric pump control method, a computer program product and electronic equipment, a vehicle comprises an electric pump and an engine, the engine comprises an oil delivery pump, an oil outlet of the electric pump is connected with an oil inlet of the oil delivery pump, and the maximum flow of the electric pump is larger than the target flow. The target flow is the flow corresponding to the minimum oil inlet pressure of an oil delivery pump under the rated rotating speed of an engine. The method comprises the steps that the atmospheric pressure at the current moment is obtained; determining whether the atmospheric pressure is less than a threshold pressure; under the condition that the atmospheric pressure is smaller than the threshold pressure, the rotating speed of the engine at the current moment is obtained; and the electric pump is controlled to work at least according to the rotating speed of the engine, and the problem that in the prior art, when the engine is used in a plateau exceeding a certain altitude, the dynamic property of the engine is poor is solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a control method for an electric pump, a computer-readable storage medium, a computer program product, and an electronic device. Background Art

[0002] The fuel pump integrated on the fuel injection pump used in the diesel engine requires the fuel inlet pressure to be within the range of (35-100) kPaA. If the fuel inlet pressure is lower than 35 kPaA, the fuel supply efficiency of the fuel pump will be reduced, and the fuel supply capacity cannot be guaranteed, resulting in insufficient engine power; if the fuel inlet pressure is higher than 100 kPaA, the engine rail pressure will increase, and the valve will be easily flushed. At present, for diesel engines with a displacement of more than 5L, the fuel pump flow rate is usually higher than 200L / h at the minimum fuel inlet pressure (35 kPaA) at high speed. When the engine is used on a plateau above a certain altitude, the atmospheric pressure decreases. Since the current maximum flow rate of the electric pump is less than the fuel pump flow rate at the minimum fuel inlet pressure at high speed, and it only works for 3 minutes, the fuel pump inlet pressure at high speed cannot be guaranteed to be within the range of (35-100) kPaA, affecting the power of the engine. Summary of the invention

[0003] The main purpose of the present application is to provide a control method for an electric pump, a computer-readable storage medium, a computer program product and an electronic device, so as to at least solve the problem in the prior art that the engine has poor power when the engine is used in a plateau exceeding a certain altitude.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a control method for an electric pump is provided, wherein a vehicle comprises an electric pump and an engine, wherein the engine comprises an oil pump, wherein the oil outlet of the electric pump is connected to the oil inlet of the oil pump, and the maximum flow rate of the electric pump is greater than a target flow rate, wherein the target flow rate is a flow rate corresponding to the minimum oil inlet pressure of the oil pump at the rated speed of the engine, and wherein the method comprises: obtaining the atmospheric pressure at a current moment; determining whether the atmospheric pressure is less than a threshold pressure; when the atmospheric pressure is less than the threshold pressure, obtaining the speed of the engine at the current moment; and controlling the operation of the electric pump at least according to the speed of the engine.

[0005] Optionally, the vehicle further includes a fuel filter, an oil pipe and an oil circuit, the electric pump is connected to the fuel pump through the fuel filter, the electric pump is connected to the fuel filter through the oil pipe, the fuel filter is connected to the fuel pump through the oil pipe, the back pressure of the oil outlet of the electric pump corresponding to the target flow rate of the electric pump is greater than the sum of the pressure losses of the fuel filter and the oil circuit, the maximum back pressure of the oil outlet of the electric pump is not less than the back pressure of the oil outlet of the electric pump corresponding to the target flow rate of the electric pump, and the operation of the electric pump is controlled at least according to the speed of the engine, including: determining whether the speed of the engine is greater than a threshold speed; when the speed of the engine is greater than the threshold speed, turning on the electric pump to increase the pressure of the oil inlet of the fuel pump.

[0006] Optionally, the method also includes: when the atmospheric pressure is less than the threshold pressure and the engine speed is not greater than the threshold speed, determining whether the engine speed is 0; when the engine speed is 0, turning on the electric pump to vent the oil circuit.

[0007] Optionally, the method further includes: when the atmospheric pressure is not less than the threshold pressure, determining whether the speed of the engine is 0; when the speed of the engine is 0, turning on the electric pump to exhaust the oil circuit.

[0008] Optionally, the method further includes: when the atmospheric pressure is not less than the threshold pressure and the rotation speed of the engine is not zero, turning off the electric pump.

[0009] Optionally, when the speed of the engine is greater than the threshold speed, after turning on the electric pump, the method further includes: obtaining a current pressure value of the oil inlet of the oil pump; and controlling the speed of the electric pump to increase or decrease according to the current pressure value.

[0010] Optionally, controlling the rotation speed of the electric pump to increase or decrease according to the current pressure value includes: determining the difference between the current pressure value and the minimum oil inlet pressure as a target pressure difference; and controlling the rotation speed of the electric pump to increase or decrease according to the target pressure difference.

[0011] According to another aspect of the present application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the electric pump control methods.

[0012] According to another aspect of the present application, a computer program product is provided, comprising computer instructions, wherein when the computer instructions are executed by a processor, any one of the electric pump control methods is implemented.

[0013] According to another aspect of the present application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a control method for executing any one of the electric pumps described.

[0014] By applying the technical solution of the present application, the maximum flow of the electric pump is greater than the flow corresponding to the minimum oil inlet pressure of the oil pump at the rated speed of the engine. First, the atmospheric pressure at the current moment is obtained, and then when the atmospheric pressure is lower than the threshold pressure, the electric pump is controlled to work according to the engine speed. Compared with the problem of poor engine power when the engine is used in a plateau exceeding a certain altitude in the prior art, the maximum flow of the electric pump is greater than the flow corresponding to the minimum oil inlet pressure of the oil pump at the rated speed of the engine, which ensures that the subsequent electric pump can assist in increasing the oil inlet pressure of the oil pump. When the atmospheric pressure is lower than the threshold pressure, it means that the engine is used in plateau conditions. At this time, the electric pump is controlled to work according to the engine speed, so that the electric pump can be controlled to work according to the oil inlet pressure of the oil pump at the engine speed. The electric pump is used to assist the oil pump, which ensures that the engine has good power under plateau conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 A schematic diagram of a flow rate and pressure curve of a commonly used electric pump for a diesel engine in the prior art is shown;

[0017] Figure 2 A hardware structure block diagram of a mobile terminal for executing a method for controlling an electric pump provided in an embodiment of the present application is shown;

[0018] Figure 3 A schematic flow chart of a control method for an electric pump provided according to an embodiment of the present application is shown;

[0019] Figure 4 A schematic diagram of a flow rate pressure curve of a large flow rate electric pump provided according to an embodiment of the present application is shown;

[0020] Figure 5A schematic diagram of the electrical principle of an electric pump provided according to an embodiment of the present application is shown;

[0021] Figure 6 A flow chart of a specific electric pump control method provided according to an embodiment of the present application is shown.

[0022] The above drawings include the following reference numerals:

[0023] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] Figure 1 This is the flow pressure curve of the electric pump commonly used in diesel engines. The electric pump has a small flow rate and is not controlled by the ECU (Engine Control Unit). It stops automatically after working for 3 minutes. It is usually connected in series in the low-pressure oil circuit and is only used for oil circuit exhaust before the engine starts.

[0028] As introduced in the background technology, in the prior art, when the engine is used in a plateau exceeding a certain altitude, the power of the engine is poor. To solve the above problem, the embodiments of the present application provide a control method for an electric pump, a computer-readable storage medium, a computer program product and an electronic device.

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 2 FIG. 1 is a hardware structure block diagram of a mobile terminal of a method for controlling an electric pump according to an embodiment of the present invention. Figure 2 As shown, the mobile terminal may include one or more ( Figure 2 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 2 The structure shown is for illustration only and does not limit the structure of the mobile terminal. Figure 2 More or fewer components as shown, or with Figure 2 Different configurations are shown.

[0031] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the control method of the electric pump in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The above-mentioned network specific example may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0032] In this embodiment, a control method for an electric pump running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0033] Figure 3 The flow chart of the control method of the electric pump according to the embodiment of the present application. The vehicle includes an electric pump and an engine, the engine includes an oil pump, the oil outlet of the electric pump is connected to the oil inlet of the oil pump, the maximum flow of the electric pump is greater than the target flow, and the target flow is the flow corresponding to the minimum oil inlet pressure of the oil pump at the rated speed of the engine, such as Figure 2 As shown, the method comprises the following steps:

[0034] Step S201, obtaining the current atmospheric pressure;

[0035] Step S202, determining whether the atmospheric pressure is less than a threshold pressure;

[0036] Step S203, when the atmospheric pressure is less than the threshold pressure, obtaining the engine speed at the current moment;

[0037] Step S204, controlling the operation of the electric pump at least according to the rotation speed of the engine.

[0038] Through the above embodiment, the maximum flow of the electric pump is greater than the flow corresponding to the minimum oil inlet pressure of the oil pump at the rated speed of the engine. First, the atmospheric pressure at the current moment is obtained, and then when the atmospheric pressure is lower than the threshold pressure, the electric pump is controlled to work according to the engine speed. Compared with the problem of poor engine power when the engine is used in a plateau exceeding a certain altitude in the prior art, the maximum flow of the electric pump is greater than the flow corresponding to the minimum oil inlet pressure of the oil pump at the rated speed of the engine, which ensures that the subsequent electric pump can assist in increasing the oil inlet pressure of the oil pump. When the atmospheric pressure is less than the threshold pressure, it means that the engine is used in plateau conditions. At this time, the electric pump is controlled to work according to the engine speed, so that the electric pump can be controlled to work according to the oil inlet pressure of the oil pump at the engine speed. The electric pump is used to assist the oil pump, which ensures that the engine has good power under plateau conditions.

[0039] In actual application, those skilled in the art may set the above threshold pressure based on empirical values, or obtain it through multiple experiments, and this application does not impose any specific restrictions on this.

[0040] In an optional scheme, the vehicle further includes a fuel filter, an oil pipe and an oil circuit, the electric pump is connected to the oil pump through the fuel filter, the electric pump is connected to the fuel filter through the oil pipe, the fuel filter is connected to the oil pump through the oil pipe, the back pressure of the oil outlet of the electric pump corresponding to the flow rate of the electric pump being the target flow rate is greater than the sum of the pressure losses of the fuel filter and the oil circuit, the maximum back pressure of the oil outlet of the electric pump is not less than the back pressure of the oil outlet of the electric pump corresponding to the flow rate of the electric pump being the target flow rate, and the operation of the electric pump is controlled at least according to the speed of the engine, including: determining whether the speed of the engine is greater than a threshold speed; when the speed of the engine is greater than the threshold speed, turning on the electric pump to increase the pressure of the oil inlet of the oil pump. In this embodiment, when the flow rate of the electric pump is the target flow rate, the corresponding back pressure of the oil outlet of the electric pump is greater than the sum of the pressure losses in the fuel filter and the oil circuit. When the engine speed is greater than the threshold speed, the oil inlet pressure of the fuel pump is less than the minimum oil inlet pressure. At this time, the electric pump is turned on to increase the oil inlet pressure of the fuel pump, thereby providing additional fuel flow, further ensuring that the engine can work normally in special environments such as plateaus and maintain its power performance.

[0041] In actual application, technicians in this field can set the above threshold speed based on empirical values, or obtain it based on multiple experiments. This application does not impose any specific restrictions on this.

[0042] Specifically, the threshold pressure and the threshold speed can both be obtained by calibrating the engine.

[0043] Specifically, the flow design of large flow electric pump: Figure 4 As shown, the horizontal axis is the back pressure of the oil outlet of the electric pump, which is the relative pressure (the difference between the actual oil outlet pressure of the electric pump and the atmospheric pressure), and the vertical axis is the flow rate of the electric pump under different oil outlet back pressures. Q is the oil pump flow rate at the minimum oil inlet pressure (35kPaA) at the rated speed of the engine. P is the oil outlet back pressure corresponding to the electric pump flow rate Q. Pmax is the maximum back pressure of the oil outlet of the electric pump. When the back pressure of the oil outlet of the electric pump is 0kPa, the electric pump flow rate must be greater than Q, that is, the maximum flow rate of the electric pump must be greater than the oil pump flow rate at the minimum oil inlet pressure at the rated speed of the engine. At the same time, the pressure loss of the fuel filter and the oil circuit must be considered, that is, P must be greater than the sum of the pressure losses of the fuel filter and the oil circuit. Pmax can be reasonably set according to the exhaust requirements of the oil circuit and cannot be less than P.

[0044] In other embodiments, the method further includes: when the atmospheric pressure is less than the threshold pressure and the speed of the engine is not greater than the threshold speed, determining whether the speed of the engine is 0; when the speed of the engine is 0, starting the electric pump to exhaust the oil circuit. In this embodiment, when the atmospheric pressure is less than the threshold pressure and the speed of the engine is not greater than the threshold speed, determining whether the speed of the engine is 0, when the speed of the engine is 0, it indicates that the engine has not started, and at this time, starting the electric pump to exhaust the oil circuit to ensure the smoothness of the oil circuit, so that the fuel delivery efficiency is higher after the subsequent engine is started.

[0045] In other embodiments, when the atmospheric pressure is less than the threshold pressure and the speed of the engine is not greater than the threshold speed, after determining whether the speed of the engine is 0, the method further comprises: when the speed of the engine is not 0, turning off the electric pump. In this embodiment, when the atmospheric pressure is less than the threshold pressure and the speed of the engine is not greater than the threshold speed, the electric pump is turned off to avoid excessive pressure at the oil inlet of the oil pump.

[0046] Specifically, when the engine speed is low, the oil pump flow is small, and the electric pump flow is greater than the oil pump flow. At this time, the oil pump inlet pressure is at risk of exceeding the maximum value (100kPaA), and the opening and closing of the electric pump needs to be effectively controlled. When the atmospheric pressure is higher than the threshold pressure, the oil pump inlet pressure is greater than 35kPaA at each engine speed; when the atmospheric pressure is lower than the threshold pressure and the engine speed is higher than the threshold speed, the oil pump inlet pressure will be less than 35kPaA. After the ECU is powered on, it determines whether it is a plateau application by identifying the atmospheric pressure. When the atmospheric pressure is higher than the threshold pressure, the oil pump inlet pressure is greater than 35kPaA at each engine speed. At this time, the electric pump is only used for pipeline exhaust before the engine starts; when the atmospheric pressure is lower than the threshold pressure and the engine speed is higher than the threshold speed, the electric pump is turned on to make the oil pump inlet pressure greater than 35kPaA. When the engine speed is lower than the threshold speed, the electric pump is turned off to prevent the oil pump inlet pressure from exceeding 100kPaA.

[0047] Specifically, Figure 5 This is the electrical schematic diagram of the electric pump. The ECU control pins are reserved on the electric pump. The ECU can drive the electric pump at a high level or a low level. The controller protection module is used to protect the entire control circuit (for example, power off when a large current or reverse voltage appears in the circuit). The control module is used to control the electric pump M. The back-electromotive force detection module is used to detect whether a reverse voltage appears in the circuit. The fuse can protect the circuit. The PWM (Pulse Width Modulation) waveform conversion module is used to change the duty cycle of the PWM waveform, which can control the driving current of the electric pump and then adjust the speed of the electric pump. The ECU is used to provide a high level or a low level.

[0048] In some exemplary embodiments, the method further includes: when the atmospheric pressure is not less than the threshold pressure, determining whether the speed of the engine is 0; when the speed of the engine is 0, starting the electric pump to exhaust the oil circuit. In this embodiment, when the atmospheric pressure is not less than the threshold pressure, determining whether the speed of the engine is 0, when the speed of the engine is 0, it means that the engine has not started at this time, and starting the electric pump to exhaust the oil circuit at this time ensures that the oil circuit is relatively smooth, so that the fuel delivery efficiency is higher after the subsequent engine is started.

[0049] In some other optional solutions, the method further includes: when the atmospheric pressure is not less than the threshold pressure and the speed of the engine is not 0, turning off the electric pump. In this embodiment, when the atmospheric pressure is not less than the threshold pressure and the speed of the engine is not 0, turning off the electric pump avoids excessive pressure at the oil inlet of the oil transfer pump.

[0050] In some other optional solutions, when the speed of the engine is greater than the threshold speed, after the electric pump is turned on, the method further includes: obtaining the current pressure value of the oil inlet of the oil pump; and controlling the speed of the electric pump to increase or decrease according to the current pressure value. In this embodiment, the speed of the electric pump is controlled to increase or decrease according to the current pressure value of the oil inlet of the oil pump, which ensures that the pressure of the oil inlet of the oil pump is supplemented more accurately, and further ensures that the power of the engine is better.

[0051] In some other exemplary embodiments, according to the current pressure value, controlling the speed of the electric pump to increase or decrease includes: determining the difference between the current pressure value and the minimum oil inlet pressure as a target pressure difference; and according to the target pressure difference, controlling the speed of the electric pump to increase or decrease. In this embodiment, according to the difference between the current pressure value and the minimum oil inlet pressure, controlling the speed of the electric pump to increase or decrease further ensures that the supplement of the oil inlet pressure of the oil delivery pump is more accurate, and further ensures that the power performance of the engine is better.

[0052] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the control method of the electric pump of the present application will be described in detail below in combination with specific embodiments.

[0053] This embodiment relates to a specific control method of an electric pump, such as Figure 6 As shown, the following steps are included:

[0054] Step S1: The ECU is powered on and determines whether the current atmospheric pressure is less than the threshold pressure XkPaA;

[0055] Step S2: when the atmospheric pressure is less than the threshold pressure, determine whether the engine speed is 0; when the engine speed is 0, turn on the electric pump to pump oil and exhaust, and the maximum working time of the electric pump is 3 minutes; when the engine speed is not 0, determine whether the engine speed is greater than the threshold speed n1; when the engine speed is greater than the threshold speed, turn on the electric pump, and when the engine speed is not greater than the threshold speed, turn off the electric pump;

[0056] Step S3: When the atmospheric pressure is not less than the threshold pressure, determine whether the engine speed is 0; when the engine speed is 0, turn on the electric pump to pump oil and exhaust air, and the maximum working time of the electric pump is 3 minutes; when the engine speed is not 0, turn off the electric pump.

[0057] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0058] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the control method of the electric pump.

[0059] Specifically, the control method of the electric pump includes:

[0060] Step S201, obtaining the current atmospheric pressure;

[0061] Step S202, determining whether the atmospheric pressure is less than a threshold pressure;

[0062] Step S203, when the atmospheric pressure is less than the threshold pressure, obtaining the engine speed at the current moment;

[0063] Step S204, controlling the operation of the electric pump at least according to the rotation speed of the engine.

[0064] Optionally, the vehicle further includes a fuel filter, an oil pipe and an oil circuit, the electric pump is connected to the fuel pump through the fuel filter, the electric pump is connected to the fuel filter through the oil pipe, the fuel filter is connected to the fuel pump through the oil pipe, the back pressure of the fuel outlet of the electric pump corresponding to the flow rate of the electric pump being the target flow rate is greater than the sum of the pressure losses of the fuel filter and the oil circuit, the maximum back pressure of the fuel outlet of the electric pump is not less than the back pressure of the fuel outlet of the electric pump corresponding to the flow rate of the electric pump being the target flow rate, and the operation of the electric pump is controlled at least according to the speed of the engine, including: determining whether the speed of the engine is greater than a threshold speed; when the speed of the engine is greater than the threshold speed, turning on the electric pump to increase the pressure of the fuel inlet of the fuel pump.

[0065] Optionally, the method further includes: when the atmospheric pressure is less than the threshold pressure and the speed of the engine is not greater than the threshold speed, determining whether the speed of the engine is 0; when the speed of the engine is 0, turning on the electric pump to exhaust the oil circuit.

[0066] Optionally, the method further includes: when the atmospheric pressure is not less than the threshold pressure, determining whether the speed of the engine is 0; when the speed of the engine is 0, turning on the electric pump to exhaust the oil circuit.

[0067] Optionally, the method further includes: when the atmospheric pressure is not less than the threshold pressure and the rotation speed of the engine is not 0, turning off the electric pump.

[0068] Optionally, when the speed of the engine is greater than the threshold speed, after turning on the electric pump, the method further includes: obtaining a current pressure value of the oil inlet of the oil pump; and controlling the speed of the electric pump to increase or decrease according to the current pressure value.

[0069] Optionally, according to the current pressure value, controlling the speed of the electric pump to increase or decrease includes: determining the difference between the current pressure value and the minimum oil inlet pressure as a target pressure difference; and according to the target pressure difference, controlling the speed of the electric pump to increase or decrease.

[0070] The present application also provides a computer program product, including computer instructions, which, when executed by a processor, implement at least the following method steps: step S201, obtaining the atmospheric pressure at a current moment; step S202, determining whether the atmospheric pressure is less than a threshold pressure; step S203, when the atmospheric pressure is less than the threshold pressure, obtaining the rotational speed of the engine at the current moment; step S204, controlling the operation of the electric pump at least according to the rotational speed of the engine.

[0071] Optionally, the vehicle further includes a fuel filter, an oil pipe and an oil circuit, the electric pump is connected to the fuel pump through the fuel filter, the electric pump is connected to the fuel filter through the oil pipe, the fuel filter is connected to the fuel pump through the oil pipe, the back pressure of the fuel outlet of the electric pump corresponding to the flow rate of the electric pump being the target flow rate is greater than the sum of the pressure losses of the fuel filter and the oil circuit, the maximum back pressure of the fuel outlet of the electric pump is not less than the back pressure of the fuel outlet of the electric pump corresponding to the flow rate of the electric pump being the target flow rate, and the operation of the electric pump is controlled at least according to the speed of the engine, including: determining whether the speed of the engine is greater than a threshold speed; when the speed of the engine is greater than the threshold speed, turning on the electric pump to increase the pressure of the fuel inlet of the fuel pump.

[0072] Optionally, the method further includes: when the atmospheric pressure is less than the threshold pressure and the speed of the engine is not greater than the threshold speed, determining whether the speed of the engine is 0; when the speed of the engine is 0, turning on the electric pump to exhaust the oil circuit.

[0073] Optionally, the method further includes: when the atmospheric pressure is not less than the threshold pressure, determining whether the speed of the engine is 0; when the speed of the engine is 0, turning on the electric pump to exhaust the oil circuit.

[0074] Optionally, the method further includes: when the atmospheric pressure is not less than the threshold pressure and the rotation speed of the engine is not 0, turning off the electric pump.

[0075] Optionally, when the speed of the engine is greater than the threshold speed, after turning on the electric pump, the method further includes: obtaining a current pressure value of the oil inlet of the oil pump; and controlling the speed of the electric pump to increase or decrease according to the current pressure value.

[0076] Optionally, according to the current pressure value, controlling the speed of the electric pump to increase or decrease includes: determining the difference between the current pressure value and the minimum oil inlet pressure as a target pressure difference; and according to the target pressure difference, controlling the speed of the electric pump to increase or decrease.

[0077] The present application also provides an electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a control method for executing any one of the above-mentioned electric pumps.

[0078] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0079] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0080] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0081] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0083] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0084] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0085] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0086] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0087] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0088] In the control method of the electric pump of the present application, the maximum flow of the electric pump is greater than the flow corresponding to the minimum oil inlet pressure of the oil pump at the rated speed of the engine. First, the atmospheric pressure at the current moment is obtained, and then when the atmospheric pressure is lower than the threshold pressure, the electric pump is controlled to work according to the engine speed. Compared with the problem of poor engine power when the engine is used in a plateau exceeding a certain altitude in the prior art, the maximum flow of the electric pump is greater than the flow corresponding to the minimum oil inlet pressure of the oil pump at the rated speed of the engine, which ensures that the subsequent electric pump can assist in increasing the oil inlet pressure of the oil pump. When the atmospheric pressure is less than the threshold pressure, it means that the engine is used in plateau conditions. At this time, the electric pump is controlled to work according to the engine speed, so that the electric pump can be controlled to work according to the oil inlet pressure of the oil pump at the engine speed. The electric pump is used to assist the oil pump, which ensures that the engine has good power under plateau conditions.

[0089] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for an electric pump, characterized in that: The vehicle comprises an electric pump and an engine, the engine comprises an oil transfer pump, an oil outlet of the electric pump is connected to an oil inlet of the oil transfer pump, a maximum flow rate of the electric pump is greater than a target flow rate, the target flow rate is a flow rate corresponding to a minimum oil inlet pressure of the oil transfer pump at a rated speed of the engine, and the method comprises: Get the current atmospheric pressure; determining whether the atmospheric pressure is less than a threshold pressure; When the atmospheric pressure is less than the threshold pressure, obtaining the engine speed at the current moment; The operation of the electric pump is controlled at least according to the rotation speed of the engine.

2. The control method of the electric pump according to claim 1, characterized in that: The vehicle further includes a fuel filter, an oil pipe and an oil circuit, the electric pump is connected to the oil delivery pump through the fuel filter, the electric pump is connected to the fuel filter through the oil pipe, the fuel filter is connected to the oil delivery pump through the oil pipe, the back pressure of the oil outlet of the electric pump corresponding to the target flow rate of the electric pump is greater than the sum of the pressure losses of the fuel filter and the oil circuit, the maximum back pressure of the oil outlet of the electric pump is not less than the back pressure of the oil outlet of the electric pump corresponding to the target flow rate of the electric pump, and the operation of the electric pump is controlled at least according to the rotation speed of the engine, including: determining whether the speed of the engine is greater than a threshold speed; When the rotation speed of the engine is greater than the threshold rotation speed, the electric pump is turned on to increase the pressure of the oil inlet of the oil delivery pump.

3. The control method of the electric pump according to claim 2, characterized in that: The method further comprises: When the atmospheric pressure is less than the threshold pressure and the speed of the engine is not greater than the threshold speed, determining whether the speed of the engine is 0; When the speed of the engine is 0, the electric pump is turned on to exhaust the oil circuit.

4. The control method of the electric pump according to claim 2, characterized in that: The method further comprises: In a case where the atmospheric pressure is not less than the threshold pressure, determining whether the speed of the engine is 0; When the speed of the engine is 0, the electric pump is turned on to exhaust the oil circuit.

5. The control method of the electric pump according to claim 4, characterized in that: The method further comprises: When the atmospheric pressure is not less than the threshold pressure and the rotation speed of the engine is not zero, the electric pump is turned off.

6. The control method of the electric pump according to claim 2, characterized in that: When the speed of the engine is greater than the threshold speed, after turning on the electric pump, the method further includes: Obtaining a current pressure value of the oil inlet of the oil pump; The rotation speed of the electric pump is controlled to increase or decrease according to the current pressure value.

7. The control method of the electric pump according to claim 6, characterized in that: According to the current pressure value, controlling the rotation speed of the electric pump to increase or decrease includes: Determine the difference between the current pressure value and the minimum oil inlet pressure as a target pressure difference; The rotation speed of the electric pump is controlled to increase or decrease according to the target pressure difference.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the control method of the electric pump according to any one of claims 1 to 7.

9. A computer program product comprising computer instructions, characterized in that When the computer instructions are executed by a processor, the control method of the electric pump according to any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a control method for executing the electric pump described in any one of claims 1 to 7.

Images