Oil pump control method and device, hydraulic system and engineering mechanical equipment

Abstract

The invention relates to the technical field of engine control, and discloses an oil pump control method and device, a hydraulic system and engineering mechanical equipment. An engine is matched through oil pump power self-calibration discharge, that is, the oil pump flow is changed by adjusting oil pump control current, the oil pump control current is slowly changed, and the power limit of the engine is captured; the optimal torque matching of the engine and the oil pump is realized, the oil pump control current corresponding to the rotating speed of all vehicle engines is obtained, the corresponding oil pump control current can be output according to the rotating speed of the engine in the subsequent engineering vehicle use process, the problems of engine flameout and speed reduction can be solved, and the power utilization rate of the engine can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and in particular to an oil pump control method, device, hydraulic system and engineering machinery equipment. Background Art

[0002] In the field of engineering machinery, a common power source is a diesel engine that drives a hydraulic oil pump to pump hydraulic oil. The engine generally uses two connection methods. One is that the engine is directly connected to the oil pump through a coupling, and the other is that the engine is connected to the oil pump through a gearbox. The connection methods are diverse, but the principles are the same. It is always necessary to ensure that the input power of the engine to the oil pump is greater than the required power of the oil pump, otherwise the engine will stall or slow down. On the other hand, if the input power of the engine to the oil pump is much greater than the required power of the oil pump, the problem of low energy utilization will arise. Therefore, the matching of the engine and the oil pump is very important. Summary of the invention

[0003] In view of this, the present invention provides an oil pump control method, device, hydraulic system and engineering machinery equipment to solve the problem of mismatch between engine speed and oil pump power, resulting in engine stalling or speed drop or low engine energy utilization.

[0004] In a first aspect, the present invention provides an oil pump control method, the method comprising: obtaining a current operating speed of a target vehicle engine; determining a target oil pump control current based on the oil pump powers corresponding to different vehicle engine speeds and the current operating speed; controlling the oil pump output flow based on the target oil pump control current; the oil pump powers corresponding to different vehicle engine speeds and the current operating speed are determined by the following steps: repeatedly performing an oil pump power calibration operation until the oil pump powers corresponding to different vehicle engine speeds are obtained, the oil pump power calibration operation comprising: when the engine speed of the vehicle used for calibration is the current engine speed, changing the oil pump control current, and after changing the oil pump control current, obtaining the speed drop of the engine speed; when the speed drop of the engine speed reaches a preset speed drop threshold, determining the changed oil pump control current as the oil pump control current corresponding to the current vehicle engine speed.

[0005] The oil pump control method provided by the present invention matches the engine through the self-calibration of the oil pump power, that is, the oil pump flow is changed by adjusting the oil pump control current, the oil pump control current is slowly changed, the power limit of the engine is captured, the optimal torque matching of the engine and the oil pump is achieved, and the oil pump control current corresponding to the engine speeds of all vehicles is obtained. Later, during the use of the engineering vehicle, the corresponding oil pump control current can be output according to the engine speed, which can not only solve the problems of engine stalling and speed loss, but also improve the engine power utilization rate.

[0006] In an optional embodiment, repeatedly performing an oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds is obtained includes: when a vehicle for calibration is located in a target area, repeatedly performing an oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds in the target area is obtained, wherein the target area is any one of a plurality of areas, and the plurality of areas include at least a low pressure area and a high altitude area.

[0007] The present invention calibrates the corresponding relationship between the engine speed and the oil pump control current based on the different regions where the vehicle is traveling. During actual vehicle driving, the corresponding engine speed and oil pump current can be matched based on the environmental region, and then the oil pump output can be accurately controlled to improve the engine power utilization rate.

[0008] In an optional implementation, before acquiring the current operating speed of the target vehicle engine, the method further includes: controlling the oil pump to switch from a load-sensitive pump state to a constant-pressure pump state.

[0009] The present invention controls the oil pump to output flow with a target control current only after the oil pump is switched from a load-sensitive pump to a constant-pressure pump state, thereby avoiding conflicts with a method of outputting flow based on load pressure.

[0010] In a second aspect, the present invention provides a hydraulic system, which includes an oil pump and a control valve, wherein the control valve is used to control the oil pump to switch to a constant pressure pump state or a load sensitive pump state; when the control valve controls the oil pump to switch to the constant pressure pump state, the oil pump outputs a flow rate based on a target oil pump control current, and the target oil pump control current passes through the oil pump control method of the first aspect or any corresponding embodiment thereof.

[0011] In the hydraulic system provided by the present invention, the control valve can control the oil pump to switch between the load-sensitive pump and the constant-pressure pump states. When the oil pump is in the constant-pressure pump state, i.e., the self-calibration working condition, the target control current can be determined based on the engine speed. The oil pump outputs a constant flow rate based on the target control current to match the engine speed.

[0012] In an optional embodiment, the hydraulic system also includes damping, which represents the opening degree of the reversing valve. When the control valve controls the oil pump to switch to the load-sensitive pump state, the hydraulic system pressure is fed back to the oil pump through the control valve, and the oil pump outputs flow based on the damping opening degree. The hydraulic system pressure is related to the load.

[0013] In an optional embodiment, the hydraulic system also includes a relief valve, wherein, when the oil pump is in a load-sensitive pump state, the hydraulic system pressure is the load pressure of the damping output, and the relief valve is used to limit the hydraulic system pressure to not be higher than a preset pressure threshold; when the oil pump is in a constant pressure pump state, the relief valve is used to maintain the hydraulic system pressure at a preset pressure threshold.

[0014] The overflow valve designed in the present invention plays a corresponding role when the oil pump is in different states, thereby ensuring the working safety of the hydraulic system.

[0015] In a third aspect, the present invention provides an oil pump control device, the device comprising: a current speed acquisition module, used to acquire the current operating speed of the target vehicle engine; a control current determination module, used to determine the target oil pump control current based on the oil pump power corresponding to different vehicle engine speeds and the current operating speed; an oil pump control module, used to control the oil pump output flow based on the target oil pump control current; the oil pump power corresponding to the different vehicle engine speeds and the current operating speed are determined by the following steps: an oil pump power calibration module, used to repeatedly perform an oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds is obtained, the oil pump power calibration operation comprising: a control current change module, used to change the oil pump control current when the engine speed of the vehicle used for calibration is the current engine speed, and after changing the oil pump control current, obtain the speed drop of the engine speed; a control current determination module, used to determine the changed oil pump control current as the oil pump control current corresponding to the current vehicle engine speed when the speed drop of the engine speed reaches a preset speed drop threshold.

[0016] In a fourth aspect, the present invention provides an engineering machinery equipment, comprising the hydraulic system and controller of the second aspect or any optional embodiment, the controller comprising: a memory and a processor, the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the oil pump control method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0017] In an optional implementation, the engineering machinery equipment is a crane, an excavator, a concrete pump truck, a grader or a road roller.

[0018] In a fifth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the oil pump control method of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a flow chart of an oil pump control method according to an embodiment of the present invention;

[0021] Figure 2 is an example flowchart of a power calibration operation according to an embodiment of the present invention;

[0022] Figure 3 is a flow chart of another oil pump control method according to an embodiment of the present invention;

[0023] Figure 4 is a structural block diagram of a hydraulic system according to an embodiment of the present invention;

[0024] Figure 5 is a structural example diagram of a hydraulic system according to an embodiment of the present invention;

[0025] Figure 6 is a structural block diagram of an engineering machinery device according to an embodiment of the present invention;

[0026] Figure 7 is a structural block diagram of an oil pump control device according to an embodiment of the present invention;

[0027] Figure 8 Schematic diagram of the hardware structure of the controller according to the embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] According to an embodiment of the present invention, an oil pump control method embodiment 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.

[0030] In this embodiment, a method for controlling an oil pump is provided, which can be used in the above-mentioned controller. Figure 1 is a flow chart of an oil pump control method according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0031] Step S101, obtaining the current operating speed of the target vehicle engine.

[0032] The target vehicle of the embodiment of the present invention can obtain the current operating speed of the engine during driving.

[0033] Step S102, determining a target oil pump control current based on the oil pump power corresponding to different vehicle engine speeds and the current operating speed.

[0034] Among them, the oil pump power corresponding to different vehicle engine speeds and the current working speed are determined by the following steps: repeatedly performing the oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds is obtained, and the oil pump power calibration operation includes: when the engine speed of the vehicle used for calibration is the current engine speed, changing the oil pump control current, and after changing the oil pump control current, obtaining the speed drop of the engine speed; when the speed drop of the engine speed reaches a preset speed drop threshold, determining the changed oil pump control current as the oil pump control current corresponding to the current vehicle engine speed.

[0035] The embodiment of the present invention can determine the target oil pump control current according to the pre-calibrated oil pump powers corresponding to different vehicle engine speeds and the acquired current operating speed of the engine.

[0036] Among them, after entering the oil pump power self-calibration program, when the engine speed of the vehicle used for calibration is the current engine speed (that is, when the engine speed is stable at the current set value), an initial current is given to the oil pump, and the oil pump control current is slowly changed. After the oil pump control current is changed, the engine speed drop Δn can be obtained, and it can be judged whether the engine speed drop reaches the preset speed drop threshold. Among them, speed drop will occur when the engine output power is insufficient. In the construction machinery industry, the speed drop threshold Δnmax equal to 100r / min is usually used as a standard as a basis for whether the engine and oil pump are reasonably matched. If the speed drop exceeds 100r / min, the match is unreasonable. This is just an example. When the engine speed drop reaches the preset speed drop threshold, the current changed oil pump control current can be determined as the oil pump control current corresponding to the current vehicle engine speed.

[0037] The embodiments of the present invention do not limit the method of slowly changing the oil pump control current, and may include but are not limited to increasing or decreasing the control current, increasing in direct proportion or decreasing in inverse proportion, etc. Taking the inverse proportional power control pump as an example, the oil pump is given an initial current (maximum current, that is, the oil pump is at minimum torque), the oil pump control current is reduced in inverse proportion, and the engine speed drop is captured in real time. Or, taking the direct proportional power control pump as an example, the oil pump is given an initial current and a minimum current, the oil pump control current is increased in direct proportion, and the engine speed drop is captured in real time.

[0038] Specifically, Figure 2 As shown, taking the inverse proportional power control pump as an example, an initial maximum current I is given to the oil pump, the oil pump control current is slowly reduced, and the engine speed drop is captured in real time, and it is detected whether the engine speed drop reaches the preset speed drop threshold. If the engine speed drop reaches the preset speed drop threshold Δnmax, then the reduced current is the calibrated oil pump control current of the current engine speed. If the engine speed drop does not reach the preset speed drop threshold, the oil pump control current is continuously reduced. This is just an example.

[0039] Step S103, controlling the oil pump output flow rate based on the target oil pump control current.

[0040] The embodiment of the present invention can control the oil pump output flow rate based on the determined target oil pump control current.

[0041] The oil pump control method provided in this embodiment matches the engine through self-calibration of the oil pump power, that is, the oil pump flow is changed by adjusting the oil pump control current, the oil pump control current is slowly changed, the power limit of the engine is captured, the optimal torque matching between the engine and the oil pump is achieved, and the oil pump control current corresponding to the engine speed of all vehicles is obtained. Later, during the use of engineering vehicles, the corresponding oil pump control current can be output according to the engine speed, which can not only solve the problems of engine stalling and speed loss, but also improve the engine power utilization rate.

[0042] In this embodiment, a method for controlling an oil pump is provided, which can be used in the above-mentioned controller. Figure 3 is a flow chart of an oil pump control method according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0043] Step S301, controlling the oil pump to switch from a load-sensitive pump state to a constant-pressure pump state.

[0044] The oil pump of the embodiment of the present invention can be in two states. When the oil pump is in the load-sensitive pump state, the flow rate can be automatically adjusted according to the change of the system load. The flow rate can be automatically adjusted to meet the system requirements by sensing the system load pressure. When the oil pump is in the constant-pressure pump state, the oil pump can maintain a constant pressure output during operation, especially in scenarios where precise pressure control is required. Therefore, the premise for the oil pump of the present invention to output the flow rate based on the target oil pump control current requires that the oil pump is in the constant-pressure pump state. Therefore, the embodiment of the present invention controls the oil pump to switch from the load-sensitive pump state to the constant-pressure pump state before obtaining the current operating speed of the target vehicle engine.

[0045] The present invention controls the oil pump to output flow with a target control current only after the oil pump is switched from a load-sensitive pump to a constant-pressure pump state, thereby avoiding conflicts with a method of outputting flow based on load pressure.

[0046] Step S302, obtain the current operating speed of the target vehicle engine. Figure 1 Step S101 of the illustrated embodiment will not be described in detail here.

[0047] Step S303, determining a target oil pump control current based on the oil pump power corresponding to different vehicle engine speeds and the current operating speed.

[0048] Among them, the oil pump power corresponding to different vehicle engine speeds and the current working speed are determined by the following steps: repeatedly performing the oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds is obtained, and the oil pump power calibration operation includes: when the engine speed of the vehicle used for calibration is the current engine speed, changing the oil pump control current, and after changing the oil pump control current, obtaining the speed drop of the engine speed; when the speed drop of the engine speed reaches a preset speed drop threshold, determining the changed oil pump control current as the oil pump control current corresponding to the current vehicle engine speed.

[0049] Specifically, repeatedly performing the oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds is obtained includes: when the vehicle used for calibration is located in a target area, repeatedly performing the oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds in the target area is obtained, wherein the target area is any one of a plurality of areas, and the plurality of areas at least include a low pressure area and a high altitude area.

[0050] The embodiments of the present invention take into account that the engine power performance corresponding to vehicles traveling in different types of areas is different. For example, in high-altitude areas, low-pressure areas, etc., the engine power loss increases, and the calibrated relationship between the engine speed and the oil pump control current is no longer suitable for high-altitude conditions. Therefore, corresponding oil pump power calibration operations can be performed based on different areas to obtain the corresponding relationship between the engine speed and the oil pump power corresponding to different types of environmental areas. In the subsequent vehicle driving process, the current driving environment of the vehicle can be determined, and the corresponding relationship between the engine speed and the oil pump power can be matched based on the current driving environment, and then the target control current can be determined based on the current engine operating speed.

[0051] The present invention calibrates the corresponding relationship between the engine speed and the oil pump control current based on the different regions where the vehicle is traveling. During actual vehicle driving, the corresponding engine speed and oil pump current can be matched based on the environmental region, and then the oil pump output can be accurately controlled to improve the engine power utilization rate.

[0052] Step S304, controlling the oil pump output flow rate based on the target oil pump control current. Figure 1 Step S103 of the illustrated embodiment will not be described in detail here.

[0053] In this embodiment, a hydraulic system is also provided. Figure 4 As shown, the hydraulic system includes an oil pump and a control valve, wherein the control valve is used to control the oil pump to switch to a constant pressure pump state or a load sensitive pump state; when the control valve controls the oil pump to switch to the constant pressure pump state, the oil pump outputs a flow rate based on a target oil pump control current, wherein the target oil pump control current is determined by the above-mentioned embodiment.

[0054] The control valve of the embodiment of the present invention can control the oil source of the oil pump feedback oil, so that the oil pump can switch between the two working states of load sensitive pump and constant pressure pump. Among them, the model type of the control valve is not limited, and it can be a solenoid reversing valve, a manual reversing valve, an electric proportional reversing valve, a hydraulically controlled reversing valve and other control valves for realizing LS oil circuit switching, and also includes any valve group for the reversing valve and the oil circuit that replaces the function of the reversing valve; the oil pump can also be a single pump, a double pump, a plurality of oil pumps in series and other forms. When the control valve controls the oil pump to switch to the constant pressure pump state, the oil pump can control the current output flow based on the target oil pump.

[0055] In the hydraulic system provided by the present invention, the control valve can control the oil pump to switch between the load-sensitive pump and the constant-pressure pump states. When the oil pump is in the constant-pressure pump state, i.e., the self-calibration working condition, the target control current can be determined based on the engine speed. The oil pump outputs a constant flow rate based on the target control current to match the engine speed.

[0056] In an optional embodiment, the hydraulic system also includes damping, where the damping represents the opening degree of the reversing valve, wherein when the control valve controls the oil pump to switch to a load-sensitive pump state, the hydraulic system pressure is fed back to the oil pump through the control valve, and the oil pump outputs flow based on the damping opening degree, wherein the hydraulic system pressure is related to the load.

[0057] like Figure 5 As shown, the hydraulic system of the embodiment of the present invention also includes a damper 3, the size of the damper 3 indicates the opening size of the reversing valve, when the control valve 4 controls the oil pump to be in a load-sensitive pump state (the oil pump state corresponding to the control valve not reversing is the load-sensitive pump state), the oil pump 1 is used as an electrically controlled power load-sensitive pump, and the load pressure output by the damper 3 is output to the hydraulic system through the control valve 4 as the control pressure, and can be fed back to the oil pump 1. The oil pump 1 can output flow based on the load pressure before and after the damper 3 and the flow area of ​​the damper 3 (the opening size of the damper 3).

[0058] In an optional embodiment, the hydraulic system also includes a relief valve, wherein, when the oil pump is in a load-sensitive pump state, the hydraulic system pressure is the load pressure of the damping output, and the relief valve is used to limit the hydraulic system pressure to be lower than a preset pressure threshold; when the oil pump is in a constant pressure pump state, the relief valve is used to maintain the hydraulic system pressure at a preset pressure threshold.

[0059] like Figure 5 As shown, the hydraulic system of the embodiment of the present invention also includes an overflow valve 2, and the control valve 4 does not switch, that is, when the oil pump 1 is in the load-sensitive pump state, the hydraulic system pressure is the load pressure output by the damping 3, and the overflow valve 2 plays the role of a safety valve to limit the hydraulic system pressure to not be higher than a preset pressure threshold; the control valve 4 switches, that is, the control valve DT01 is always energized, and the oil pump working condition is switched to the constant pressure pump state. The oil pump 1 does not need to rely on load pressure output, that is, there is no load pressure in the hydraulic system. At this time, the function of the overflow valve 2 is to maintain the hydraulic system pressure constant, control the hydraulic system pressure to always maintain it at the preset pressure threshold, and the oil pump 1 outputs a flow limited by the control power.

[0060] The overflow valve designed in the present invention plays a corresponding role when the oil pump is in different states, thereby ensuring the working safety of the hydraulic system.

[0061] In this embodiment, a construction machinery equipment is also provided, such as Figure 6 As shown, the engineering machinery equipment includes a hydraulic system and a controller, and the controller is used to execute the above-mentioned oil pump control method.

[0062] The engineering machinery equipment of the embodiments of the present invention is not limited to single-engine (i.e., there is only one engine in the engineering machinery equipment), twin-engine (the engineering machinery has two engines, the chassis has an engine, and there is still an engine for on-vehicle operation), the engine is directly connected to the oil pump, the engine is connected to the oil pump through a gearbox, or a combination of the above two groups, all of which can be applied to the oil pump control method, for example only.

[0063] Specifically, the engineering machinery equipment may be a crane, an excavator, a concrete pump truck, a grader or a roller, etc., without limitation. It may be updated in real time according to the actual operating equipment, for example only.

[0064] In this embodiment, an oil pump control device is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0065] This embodiment provides an oil pump control device, such as Figure 7 As shown, it includes: a current speed acquisition module 701, which is used to acquire the current working speed of the target vehicle engine; a control current determination module 702, which is used to determine the target oil pump control current based on the oil pump power corresponding to different vehicle engine speeds and the current working speed; an oil pump control module 703, which is used to control the oil pump output flow based on the target oil pump control current; the oil pump power corresponding to different vehicle engine speeds and the current working speed are determined by the following steps: an oil pump power calibration module, which is used to repeatedly perform an oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds is obtained, and the oil pump power calibration operation includes: a control current change module, which is used to change the oil pump control current when the engine speed of the vehicle used for calibration is the current engine speed, and after changing the oil pump control current, obtain the speed drop of the engine speed; a control current determination module, which is used to determine the changed oil pump control current as the oil pump control current corresponding to the current vehicle engine speed when the speed drop of the engine speed reaches a preset speed drop threshold.

[0066] In some optional embodiments, repeatedly performing an oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds is obtained includes: when a vehicle for calibration is located in a target area, repeatedly performing an oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds in the target area is obtained, wherein the target area is any one of a plurality of areas, and the plurality of areas include at least a low pressure area and a high altitude area.

[0067] In some optional implementations, before acquiring the current operating speed of the target vehicle engine, the oil pump control device includes: controlling the oil pump to switch from a load-sensitive pump state to a constant-pressure pump state.

[0068] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0069] The oil pump control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0070] The embodiment of the present invention also provides a controller having the above Figure 7 The oil pump control unit shown.

[0071] See also Figure 8 , Figure 8 is a schematic diagram of the structure of a controller provided by an optional embodiment of the present invention, such as Figure 8 As shown, the controller includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the controller, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple controllers can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 8 A processor 10 is taken as an example.

[0072] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0073] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0074] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created according to the use of the controller, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the controller 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 combinations thereof.

[0075] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0076] The controller also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 8 The example of connecting through bus is taken in the following.

[0077] The input device 30 can receive input digital or character information and generate key signal input related to the user settings and function control of the controller, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, an indicator bar, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED) and a tactile feedback device (e.g., a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0078] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0079] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for controlling an oil pump, characterized in that: The method comprises: Obtain the current operating speed of the target vehicle's engine; Determining a target oil pump control current based on the oil pump power corresponding to different vehicle engine speeds and the current operating speed; controlling the oil pump output flow rate based on the target oil pump control current; The oil pump powers corresponding to the different vehicle engine speeds and the current operating speed are determined by the following steps: The oil pump power calibration operation is repeatedly performed until the oil pump power corresponding to different vehicle engine speeds is obtained, and the oil pump power calibration operation includes: When the engine speed of the vehicle used for calibration is the current engine speed, changing the oil pump control current, and after changing the oil pump control current, obtaining the speed drop amount of the engine speed; When the speed drop amount of the engine speed reaches a preset speed drop amount threshold, the changed oil pump control current is determined as the oil pump control current corresponding to the current vehicle engine speed.

2. The method according to claim 1, characterized in that Repeat the oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds is obtained: When the vehicle for calibration is located in a target area, the oil pump power calibration operation is repeatedly performed until the oil pump power corresponding to different vehicle engine speeds in the target area is obtained, wherein the target area is any one of a plurality of areas, and the plurality of areas at least include a low pressure area and a high altitude area.

3. The method according to claim 1, characterized in that Before obtaining the current operating speed of the target vehicle engine, the method further includes: The control oil pump switches from the load sensing pump state to the constant pressure pump state.

4. A hydraulic system, characterized in that: The hydraulic system includes an oil pump and a control valve, wherein the control valve is used to control the oil pump to switch to a constant pressure pump state or a load sensitive pump state; When the control valve controls the oil pump to switch to the constant pressure pump state, the oil pump outputs a flow rate based on a target oil pump control current, and the target oil pump control current is determined by the oil pump control method according to any one of claims 1 to 3.

5. The hydraulic system according to claim 4, characterized in that: The hydraulic system also includes a damper, which represents the opening size of the reversing valve, wherein: When the control valve controls the oil pump to switch to the load-sensitive pump state, the hydraulic system pressure is fed back to the oil pump through the control valve, and the oil pump outputs flow based on the damping opening size. The hydraulic system pressure is related to the load.

6. The system according to claim 5, characterized in that The hydraulic system further comprises a relief valve, wherein: When the oil pump is in the load-sensing pump state, the hydraulic system pressure is the load pressure of the damping output, and the relief valve is used to limit the hydraulic system pressure to not be higher than the preset pressure threshold; When the oil pump is in the constant pressure pump state, the relief valve is used to maintain the hydraulic system pressure at a preset pressure threshold.

7. An oil pump control device, characterized in that: The device comprises: A current speed acquisition module is used to acquire the current operating speed of the target vehicle engine; A control current determination module, used to determine a target oil pump control current based on the oil pump power corresponding to different vehicle engine speeds and the current operating speed; an oil pump control module, configured to control an output flow rate of the oil pump based on the target oil pump control current; The oil pump powers corresponding to the different vehicle engine speeds and the current operating speed are determined by the following steps: The oil pump power calibration module is used to repeatedly perform the oil pump power calibration operation until the oil pump power corresponding to different vehicle engine speeds is obtained. The oil pump power calibration operation includes: A control current variation module, used for varying the oil pump control current when the engine speed of the vehicle used for calibration is the current engine speed, and obtaining the engine speed drop amount after varying the oil pump control current; The control current determination module is used to determine the changed oil pump control current as the oil pump control current corresponding to the current vehicle engine speed when the engine speed drop reaches a preset speed drop threshold.

8. An engineering machinery equipment, characterized in that: The engineering machinery equipment comprises the hydraulic system and controller described in any one of claims 4 to 6, and the controller is used to execute the oil pump control method described in any one of claims 1 to 3.

9. The engineering machinery equipment according to claim 8, characterized in that: The engineering machinery equipment is a crane, an excavator, a concrete pump truck, a grader or a roller.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the oil pump power calibration method described in any one of claims 1 to 2, or to execute the oil pump control method described in any one of claims 1 to 3.

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