Method and device for detecting initial air pressure of energy accumulator, hydraulic system and engineering machinery

Abstract

The invention relates to an energy accumulator initial air pressure detection method and device, a hydraulic system and engineering machinery, and relates to the technical field of engineering machinery. The energy accumulator initial air pressure detection method comprises the steps that the initial volume of a gas cavity of an energy accumulator is obtained; a liquid cavity of the energy accumulator is filled with liquid; acquiring a first pressure of a liquid cavity of the energy accumulator at a first time node; acquiring a second pressure of a liquid cavity of the energy accumulator at a second time node; the volume variation of a gas cavity of the energy accumulator between the first time node and the second time node is obtained; and according to the initial volume, the first pressure, the second pressure and the volume variation, the initial air pressure of the air cavity of the energy accumulator is obtained. According to the energy accumulator initial air pressure detection method and device, the hydraulic system and the engineering machine, an independent detection instrument is not needed, the step of installing the detection instrument is omitted, the detection efficiency is improved, and the initial air pressure of the energy accumulator can be detected in real time.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to an accumulator initial air pressure detection method, device, hydraulic system and engineering machinery. Background Art

[0002] In the field of engineering machinery, accumulators are usually used to store hydraulic oil, and the stored hydraulic oil is usually used in brake systems, shock absorption systems, etc. The initial air pressure of the gas chamber of the accumulator is related to the stored hydraulic oil. When the initial air pressure of the gas chamber of the accumulator decreases, the stored hydraulic oil will become less, which will affect the brake system, shock absorption system, etc., and easily cause safety accidents. In the related art, the initial air pressure of the gas chamber of the accumulator is usually detected by a special detection instrument. The detection instrument needs to be installed and debugged before the detection, resulting in low detection efficiency; and the detection instrument needs to detect the initial air pressure after the hydraulic oil of the accumulator is released, and the initial air pressure of the accumulator cannot be detected in real time. Summary of the invention

[0003] In order to solve the above technical problems, the embodiments of the present application provide an accumulator initial air pressure detection method, device, hydraulic system and engineering machinery, which do not require the use of a separate detection instrument, eliminate the step of installing the detection instrument, improve the detection efficiency, and can also perform real-time detection of the initial air pressure of the accumulator.

[0004] In a first aspect, a method for detecting an initial air pressure of an accumulator is provided, comprising:

[0005] obtaining an initial volume of a gas chamber of the accumulator;

[0006] filling the liquid chamber of the accumulator with liquid;

[0007] Acquire a first pressure of a liquid chamber of the accumulator at a first time point;

[0008] Obtaining a second pressure of the liquid chamber of the accumulator at a second time point; wherein the second pressure is greater than the first pressure;

[0009] Acquire a volume change of a gas chamber of the accumulator between the first time node and the second time node;

[0010] An initial gas pressure of the gas chamber of the accumulator is obtained according to the initial volume, the first pressure, the second pressure, and the volume change.

[0011] According to the first aspect of the present application, obtaining the volume change of the gas chamber of the accumulator between the first time node and the second time node includes:

[0012] Obtaining a filling flow rate of the accumulator between the first time node and the second time node;

[0013] The volume change is obtained according to the first time node, the second time node and the filling flow rate.

[0014] According to a first aspect of the present application, obtaining the filling flow rate of the accumulator between the first time node and the second time node includes:

[0015] Obtaining a first filling liquid flow rate between the first time node and a third time node;

[0016] Obtaining a second filling liquid flow rate between the third time node and the fourth time node;

[0017] Acquire a third filling liquid flow rate between the fourth time node and the second time node;

[0018] The obtaining of the volume change according to the first time node, the second time node and the filling flow rate includes:

[0019] Obtaining the volume change according to the first time node, the third time node, the fourth time node, the second time node, the first liquid filling flow rate, the second liquid filling flow rate, and the third liquid filling flow rate;

[0020] Among them, the first time node, the third time node, the fourth time node, and the second time node are different time nodes in time sequence; the first filling flow rate is less than the second filling flow rate; and the third filling flow rate is less than the second filling flow rate.

[0021] According to the first aspect of the present application, obtaining the first filling flow rate between the first time node and the third time node includes:

[0022] Controlling the target pump to charge the accumulator with a first displacement between the first time node and a third time node; wherein the first displacement is less than a preset displacement threshold;

[0023] Acquiring a first rotation speed and a preset volumetric efficiency of the target pump;

[0024] The first filling flow rate is obtained according to the first displacement, the first time node, the third time node, the first rotational speed, and the preset volumetric efficiency.

[0025] According to the first aspect of the present application, obtaining the second filling flow rate between the third time node and the fourth time node includes:

[0026] Controlling the target pump to charge the accumulator with a second displacement between the third time node and the fourth time node; wherein the second displacement is greater than a preset displacement threshold;

[0027] Acquiring a second rotation speed and a preset volumetric efficiency of the target pump;

[0028] The second filling flow rate is obtained according to the second displacement, the third time node, the fourth time node, the second rotational speed and the preset volumetric efficiency.

[0029] According to the first aspect of the present application, obtaining a third filling flow rate between the fourth time node and the second time node includes:

[0030] Controlling the target pump to charge the accumulator with a third displacement between the fourth time node and the second time node; wherein the third displacement is less than a preset displacement threshold;

[0031] Acquiring a third speed and a preset volumetric efficiency of the target pump;

[0032] The third filling flow rate is obtained according to the third displacement, the fourth time node, the second time node, the third rotational speed and the preset volumetric efficiency.

[0033] In a second aspect, an accumulator initial air pressure detection device is also provided, comprising:

[0034] An initial volume module, used for obtaining the initial volume of the gas chamber of the accumulator;

[0035] A first liquid filling module, used for filling the liquid chamber of the accumulator with liquid;

[0036] A first pressure module, used for obtaining a first pressure of the gas chamber of the accumulator at a first time node;

[0037] A second pressure module, used to obtain a second pressure of the gas chamber of the accumulator at a second time node; wherein the second pressure is greater than the first pressure;

[0038] A volume change module, used for obtaining a volume change of the gas chamber of the accumulator between the first time node and the second time node;

[0039] An initial air pressure module is used to obtain the initial air pressure of the gas chamber of the accumulator according to the initial volume, the first pressure, the second pressure and the volume change.

[0040] In a third aspect, a hydraulic system is also provided, comprising:

[0041] Power source;

[0042] Accumulator;

[0043] a target pump connected to the power source, the target pump being used to charge the accumulator;

[0044] A pressure sensor, used to detect the pressure of the liquid chamber of the accumulator;

[0045] The accumulator initial air pressure detection device as described in the previous embodiment is communicatively connected to the power source, the target pump and the pressure sensor.

[0046] According to a third aspect of the present application, the hydraulic system further includes:

[0047] Job components;

[0048] The solenoid valve is used to control the on / off of the fluid path between the target pump and the accumulator and the fluid path between the target pump and the operating component.

[0049] In a fourth aspect, there is also provided an engineering machine, comprising the hydraulic system as described in the previous embodiment.

[0050] In a fifth aspect, an electronic device is also provided, comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is used to execute the accumulator initial air pressure detection method described in the above embodiment.

[0051] In a sixth aspect, a computer-readable storage medium is also provided, wherein the storage medium stores a computer program, and the computer program is used to execute the accumulator initial air pressure detection method described in the above embodiment.

[0052] The accumulator initial air pressure detection method, device, hydraulic system and engineering machinery provided in the embodiments of the present application, on the first hand, in the process of executing the accumulator initial air pressure detection method, there is no need to add additional detection instruments, which reduces the detection cost, and the initial air pressure of the gas chamber of the accumulator can be detected by using the pressure sensor provided in the hydraulic system, eliminating the step of installing the detection instrument and improving the detection efficiency; on the second hand, in the process of filling the accumulator, by obtaining the first pressure and the second pressure of the liquid chamber of the accumulator at the first time node and the second time node, and the volume change of the gas chamber between the first time node and the second time node, the initial air pressure of the gas chamber of the accumulator can be calculated in real time, thereby avoiding the pressure shock problem caused by the need to release hydraulic oil before detection in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0054] Figure 1 A schematic flow chart of a method for detecting initial air pressure of an accumulator provided in accordance with an exemplary embodiment of the present application.

[0055] Figure 2 A schematic diagram of a flow chart for obtaining a volume change of a gas chamber of an accumulator between a first time node and a second time node provided in an exemplary embodiment of the present application.

[0056] Figure 3 A schematic diagram of a flow chart for obtaining a volume change of a gas chamber of an accumulator between a first time node and a second time node provided in accordance with another exemplary embodiment of the present application.

[0057] Figure 4 A schematic diagram of a flow chart for obtaining a first filling liquid flow rate between a first time node and a third time node provided for an exemplary embodiment of the present application.

[0058] Figure 5 A schematic diagram of a flow chart for obtaining a second filling liquid flow rate between a third time node and a fourth time node provided for an exemplary embodiment of the present application.

[0059] Figure 6 A schematic diagram of a flow chart for obtaining a third filling liquid flow rate between a fourth time node and a second time node provided for an exemplary embodiment of the present application.

[0060] Figure 7 A structural block diagram of an accumulator initial air pressure detection device provided by an exemplary embodiment of the present application.

[0061] Figure 8 A structural block diagram of an accumulator initial air pressure detection device provided for another exemplary embodiment of the present application.

[0062] Fig. 9 A schematic structural diagram of a hydraulic system provided for an exemplary embodiment of the present application.

[0063] Fig.10 A structural block diagram of an electronic device provided for an exemplary embodiment of the present application.

[0064] Figure markings: 600-hydraulic system; 610-power source; 620-accumulator; 630-target pump; 640-pressure sensor; 650-operating component; 651-radiator; 652-brake valve; 653-drive axle; 654-parking disc; 655-flushing valve group; 660-solenoid valve; 670-filter; 680-oil tank; 690-overflow valve; 700-manual pressure relief valve; 710-parking valve; 720-check valve. DETAILED DESCRIPTION

[0065] Below, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described here.

[0066] Figure 1 The following is a flow chart of a method for detecting the initial gas pressure of an accumulator provided by an exemplary embodiment of the present application. Figure 1 As shown, the accumulator initial air pressure detection method provided in the embodiment of the present application may include:

[0067] S210: Acquire the initial volume of the gas chamber of the accumulator.

[0068] Specifically, the initial volume of the gas chamber of the accumulator belongs to the production parameters of the accumulator. After the model of the accumulator used is confirmed, the initial volume of the gas chamber of the accumulator can be obtained.

[0069] S220: Fill the liquid chamber of the accumulator with liquid.

[0070] Specifically, the target pump can be controlled to fill the liquid chamber of the accumulator. During the filling process, the passage between the target pump and the accumulator can be connected through the solenoid valve. The hydraulic system will be described in detail later.

[0071] It should be noted that there is no order between step S210 and step S220. Step S210 may be performed first, and then step S220; or step S220 may be performed first, and then step S210.

[0072] S230: Obtaining a first pressure of the liquid chamber of the accumulator at a first time point.

[0073] S240: Obtain a second pressure of the liquid chamber of the accumulator at a second time point.

[0074] It should be understood that after executing step S220, the pressure in the liquid cavity of the accumulator will gradually increase, and the real-time pressure of the liquid cavity of the accumulator can be detected by the pressure sensor. That is, the first pressure can be detected at the first time node, and the second pressure can be detected at the second time node. The first time node is before the second time node, and correspondingly, the second pressure is greater than the first pressure.

[0075] S250: Obtaining a volume change of a gas chamber of the accumulator between a first time node and a second time node.

[0076] S260: Obtaining the initial gas pressure of the gas chamber of the accumulator according to the initial volume, the first pressure, the second pressure, and the volume change.

[0077] It should be noted that the accumulator filling process can usually be completed in a short time (usually within 10s). Therefore, the accumulator filling process can be regarded as an isothermal adiabatic process, which satisfies the following equation 1:

[0078]

[0079] Among them, P0 represents the initial gas pressure of the gas chamber of the accumulator; V0 represents the initial volume of the gas chamber of the accumulator; P1 represents the first pressure of the liquid chamber of the accumulator at the first time node; V1 represents the first volume of the gas chamber of the accumulator at the first time node; P2 represents the second pressure of the liquid chamber of the accumulator at the second time node; V2 represents the second volume of the gas chamber of the accumulator at the first time node; n represents the isothermal adiabatic process coefficient, which can be set according to actual conditions, for example, it can be set to 1.4, 1.3, 1.5, etc.

[0080] It should be understood that the volume change V satisfies the following equation 2:

[0081] V = V1 - V2;

[0082] By executing step S250 and step S260, V1 and V2 can be calculated first according to the aforementioned equations 1 and 2, and then V1 and V2 are substituted into equation 1 to calculate the initial gas pressure P0 of the gas chamber of the accumulator.

[0083] The accumulator initial air pressure detection method provided in the embodiment of the present application, on the one hand, does not require additional detection instruments during the execution of the accumulator initial air pressure detection method, thereby reducing the detection cost, and the initial air pressure of the gas chamber of the accumulator can be detected by using the pressure sensor provided in the hydraulic system, thereby eliminating the step of installing the detection instrument and improving the detection efficiency; on the other hand, during the accumulator filling process, by obtaining the first pressure and the second pressure of the liquid chamber of the accumulator at the first time node and the second time node, and the volume change of the gas chamber between the first time node and the second time node, the initial air pressure of the gas chamber of the accumulator can be calculated in real time, thereby avoiding the pressure shock problem caused by the need to release hydraulic oil before detection in the related art.

[0084] Figure 2 A schematic diagram of a flow chart of obtaining a volume change of a gas chamber of an accumulator between a first time node and a second time node provided by an exemplary embodiment of the present application. Figure 2 As shown, step S250 may include:

[0085] S251: Obtaining the filling flow rate of the accumulator between the first time node and the second time node.

[0086] S252: Obtain the volume change according to the first time node, the second time node and the filling flow rate.

[0087] In one embodiment, if the filling flow rate between the first time node and the second time node is a constant, the volume change can be obtained by multiplying the filling flow rate by the time length between the first time node and the second time node.

[0088] In one embodiment, if the filling flow rate between the first time node and the second time node is a changing value, the volume change can be calculated by integration, which will be described in detail later.

[0089] In one embodiment, the filling liquid flow rate can be detected by a flow sensor.

[0090] In one embodiment, the filling flow rate can also be indirectly calculated through parameters such as the displacement and rotation speed of the target pump, which will be described in detail later.

[0091] Figure 3 A schematic diagram of a flow chart of obtaining a volume change of a gas chamber of an accumulator between a first time node and a second time node provided by another exemplary embodiment of the present application. Figure 3 As shown, step S251 may include:

[0092] S2511: Obtain the first filling liquid flow rate between the first time node and the third time node.

[0093] S2512: Obtain a second filling liquid flow rate between the third time node and the fourth time node.

[0094] S2513: Obtain the third filling liquid flow rate between the fourth time node and the second time node.

[0095] Correspondingly, step S252 may include:

[0096] S2521: Obtain a volume change according to the first time node, the third time node, the fourth time node, the second time node, the first filling flow rate, the second filling flow rate, and the third filling flow rate.

[0097] It should be noted that the first time node, the third time node, the fourth time node, and the second time node are different time nodes in time sequence. The charging process of the accumulator can be divided into three stages: the first stage is the time period from the first time node to the third time node; the second stage is the time period from the third time node to the fourth time node; and the third stage is the time period from the fourth time node to the second time node.

[0098] It should be noted that the aforementioned first stage and third stage can be respectively regarded as the starting stage and the ending stage of the accumulator filling process, and the first filling flow rate and the third filling flow rate corresponding to the first stage and the third stage are both smaller than the second filling flow rate. In this way, the pressure shock problem existing in the starting stage and the ending stage of the accumulator filling can be effectively improved.

[0099] It should be noted that the process of executing step S2521 to obtain the volume change can refer to the following equation 3:

[0100]

[0101] Among them, V represents the volume change; t0 represents the first time node; t1 represents the third time node; t2 represents the fourth time node; t3 represents the second time node; Q1 represents the first filling flow rate; Q2 represents the second filling flow rate; Q3 represents the third filling flow rate.

[0102] In one embodiment, the filling flow rate of the accumulator in different stages can be adjusted by adjusting the displacement of the target pump, which will be described in detail later.

[0103] Figure 4 A schematic diagram of a process for obtaining a first filling liquid flow rate between a first time node and a third time node provided by an exemplary embodiment of the present application. Figure 4 As shown, step 2511 may include:

[0104] S25111: Control the target pump to charge the accumulator with the first displacement between the first time node and the third time node.

[0105] S25112: Obtain a first rotation speed and a preset volumetric efficiency of the target pump.

[0106] S25113: Obtain a first filling flow rate according to the first displacement, the first time node, the third time node, the first rotational speed, and the preset volumetric efficiency.

[0107] It should be noted that, when the accumulator is charged with liquid through the target pump, the displacement of the target pump will directly affect the charging flow rate of the accumulator. Therefore, the charging flow rate can be obtained through the displacement of the target pump in different time periods.

[0108] It should be noted that the first displacement is smaller than the preset displacement threshold. The purpose is that the time period between the first time node and the third time node belongs to the initial stage of the accumulator filling process. In the initial stage, the accumulator is filled with a smaller displacement (such as the aforementioned first displacement). The first filling flow rate of the accumulator at the initial stage of filling can be smaller, thereby effectively improving the pressure shock problem existing in the accumulator at the initial stage of filling.

[0109] It should be understood that the preset displacement threshold can be set according to actual conditions, and the present application does not specifically limit the preset displacement threshold.

[0110] The execution of step S25111, step S25112, and step S25113 may refer to the following equation 4:

[0111] Q1=D1*N1*η;

[0112] Wherein, Q1 represents the first filling flow rate; N1 represents the first speed of the target pump; η represents the preset volumetric efficiency of the target pump (the ratio of the actual output flow rate of the target pump to the theoretical flow rate). In practical applications, the preset volumetric efficiency can be confirmed according to the model of the target pump.

[0113] Figure 5 A schematic diagram of a flow chart of obtaining a second filling liquid flow rate between a third time node and a fourth time node provided by an exemplary embodiment of the present application. Figure 5 As shown, step S2512 may include:

[0114] S25121: Control the target pump to charge the accumulator with the second displacement between the third time node and the fourth time node.

[0115] S25122: Obtain a second speed and a preset volumetric efficiency of the target pump.

[0116] S25123: Obtain a second filling flow rate according to the second displacement, the third time node, the fourth time node, the second rotational speed and the preset volumetric efficiency.

[0117] It should be noted that the second displacement is greater than the preset displacement threshold. Its purpose is that the time period between the third time node and the fourth time node belongs to the intermediate stage of the accumulator filling process. Filling the accumulator with a larger displacement (such as the aforementioned second displacement) in the intermediate stage can improve the filling efficiency of the accumulator in the intermediate stage of filling.

[0118] Steps S25121, S25122, and S25123 may be performed with reference to the following equation 5:

[0119] Q2=D2*N2*η;

[0120] Among them, Q2 represents the second filling flow rate; N2 represents the second rotation speed of the target pump; η represents the preset volumetric efficiency of the target pump (the ratio of the actual output flow rate of the target pump to the theoretical flow rate).

[0121] Figure 6 A schematic diagram of a process for obtaining a third filling liquid flow rate between a fourth time node and a second time node provided by an exemplary embodiment of the present application. Figure 6 As shown, step S2513 may include:

[0122] S25131: Control the target pump to charge the accumulator with the third displacement between the fourth time node and the second time node.

[0123] S25132: Obtain a third speed and a preset volumetric efficiency of the target pump.

[0124] S25133: Obtain a third filling flow rate according to the third displacement, the fourth time node, the second time node, the third rotational speed and the preset volumetric efficiency.

[0125] It should be noted that the third displacement is smaller than the preset displacement threshold. Its purpose is that the time period between the fourth time node and the second time node belongs to the end stage of the accumulator filling process. Filling the accumulator with a smaller displacement (such as the aforementioned third displacement) at the end stage can make the third filling flow of the accumulator at the end stage of filling smaller, thereby effectively improving the pressure shock problem existing in the accumulator at the end stage of filling.

[0126] The execution of step S25131, step S25132, and step S25133 may refer to the following equation 6:

[0127] Q3=D3*N3*η;

[0128] Among them, Q3 represents the third filling flow rate; N3 represents the third speed of the target pump; η represents the preset volumetric efficiency of the target pump (the ratio of the actual output flow rate of the target pump to the theoretical flow rate).

[0129] In one embodiment, the time nodes at which the liquid chamber of the accumulator is at different pressures can be detected by the pressure sensor to determine the time nodes for adjusting the displacement of the target pump, that is, to determine the aforementioned first time node, third time node, fourth time node and second time node. For example, when the pressure sensor detects that the pressure of the liquid chamber of the accumulator is the aforementioned first pressure P1, the system receives the pressure signal of the pressure sensor, can record the current first time node and the first pressure, and control the target pump to fill the accumulator with the first displacement; as the filling process proceeds, the pressure of the liquid chamber of the accumulator gradually increases. When the pressure sensor detects that the pressure of the liquid chamber of the accumulator is the third pressure P3, the system receives the pressure signal of the pressure sensor, can record the current third time node (the filling time period of the first displacement is the time period between the first time node and the third time node) and the third pressure, and control the target pump to fill the accumulator with the second displacement. ; When the pressure sensor detects that the pressure in the liquid chamber of the accumulator is the fourth pressure P4, the system receives the pressure signal of the pressure sensor, can record the current fourth time node (the filling time period of the second displacement is the time period between the third time node and the fourth time node) and the fourth pressure, and control the target pump to fill the accumulator with the third displacement; when the pressure sensor detects that the pressure in the liquid chamber of the accumulator is the second pressure P2, the system receives the pressure signal of the pressure sensor, can record the current second time node (the filling time period of the third displacement is the time period between the fourth time node and the second time node) and the second pressure (the accumulator reaches the filling set pressure), and stops filling.

[0130] Figure 7 This is a structural block diagram of an accumulator initial air pressure detection device provided by an exemplary embodiment of the present application. Figure 7 As shown, the accumulator initial air pressure detection device 400 provided in the embodiment of the present application may include an initial volume module 410, used to obtain the initial volume of the gas chamber of the accumulator; a first liquid filling module 420, used to fill the liquid chamber of the accumulator with liquid; a first pressure module 430, used to obtain the first pressure of the gas chamber of the accumulator at a first time node; a second pressure module 440, used to obtain the second pressure of the gas chamber of the accumulator at a second time node; wherein the second pressure is greater than the first pressure; a volume change module 450, used to obtain the volume change of the gas chamber of the accumulator between the first time node and the second time node; an initial air pressure module 460, used to obtain the initial air pressure of the gas chamber of the accumulator according to the initial volume, the first pressure, the second pressure and the volume change.

[0131] The accumulator initial air pressure detection device 400 provided in the embodiment of the present application, on the one hand, does not require additional detection instruments in the process of executing the accumulator initial air pressure detection method, thereby reducing the detection cost, and can detect the initial air pressure of the gas chamber of the accumulator by using the pressure sensor provided in the hydraulic system, eliminating the step of installing the detection instrument and improving the detection efficiency; on the other hand, during the accumulator filling process, by obtaining the first pressure and the second pressure of the liquid chamber of the accumulator at the first time node and the second time node, and the volume change of the gas chamber between the first time node and the second time node, the initial air pressure of the gas chamber of the accumulator can be calculated in real time, thereby avoiding the pressure shock problem caused by the need to release hydraulic oil before detection in the related art.

[0132] Figure 8 This is a structural block diagram of an accumulator initial air pressure detection device provided by another exemplary embodiment of the present application. Figure 8 As shown, in one embodiment, the volume change module 450 includes: a flow acquisition module 451, used to obtain the filling flow of the accumulator between the first time node and the second time node; a first calculation module 452, used to obtain the volume change according to the first time node, the second time node and the filling flow.

[0133] like Figure 8 As shown, in one embodiment, the flow acquisition module 451 includes: a first acquisition module 4511, used to acquire a first filling flow between a first time node and a third time node; a second acquisition module 4512, used to acquire a second filling flow between a third time node and a fourth time node; a third acquisition module 4513, used to acquire a third filling flow between a fourth time node and a second time node. Correspondingly, the first calculation module 452 can also be used to obtain a volume change according to the first time node, the third time node, the fourth time node, the second time node, the first filling flow, the second filling flow, and the third filling flow.

[0134] like Figure 8 As shown, in one embodiment, the first acquisition module 4511 may include: a second filling module 45111, used to control the target pump to fill the accumulator with a first displacement between the first time node and the third time node; a fourth acquisition module 45112, used to obtain the first speed and preset volumetric efficiency of the target pump; a second calculation module 45113, used to obtain the first filling flow rate according to the first displacement, the first time node, the third time node, the first speed and the preset volumetric efficiency.

[0135] like Figure 8As shown, in one embodiment, the second acquisition module 4512 may include: a third filling module 45121, used to control the target pump to fill the accumulator with a second displacement between a third time node and a fourth time node; a fifth acquisition module 45122, used to obtain the second speed and a preset volumetric efficiency of the target pump; a third calculation module 45123, used to obtain the second filling flow rate according to the second displacement, the third time node, the fourth time node, the second speed and the preset volumetric efficiency.

[0136] like Figure 8 As shown, in one embodiment, the third acquisition module 4513 may include: a fourth filling module 45131, used to control the target pump to fill the accumulator with a third displacement between the fourth time node and the second time node; a sixth acquisition module 45132, used to obtain the third speed and preset volumetric efficiency of the target pump; a fourth calculation module 45133, used to obtain the third filling flow rate according to the third displacement, the fourth time node, the second time node, the third speed and the preset volumetric efficiency.

[0137] Fig. 9 The structural diagram of the hydraulic system provided by an exemplary embodiment of the present application is shown in FIG. Fig. 9 As shown, the hydraulic system 600 provided in the embodiment of the present application may include a power source 610, an accumulator 620, a target pump 630, a pressure sensor 640 and the accumulator initial air pressure detection device 400 as described in the previous embodiment, the target pump 630 is connected to the power source 610, and the accumulator initial air pressure detection device 400 is communicatively connected to the power source 610, the target pump 630 and the pressure sensor 640.

[0138] In practical applications, the power source 610 can drive the target pump 630 to work, and the hydraulic oil output by the target pump 630 can flow to the accumulator 620 to achieve the purpose of filling the accumulator 620. During the filling process, the pressure sensor 640 can be used to detect the pressure of the liquid chamber of the accumulator 620. Referring to the above description, the pressure sensor 640 can send a signal to the accumulator initial air pressure detection device 400 when different preset pressures are detected, so that the accumulator initial air pressure detection device 400 records the time node, the corresponding pressure, and adjusts the displacement of the target pump 630 accordingly.

[0139] The hydraulic system 600 provided in the embodiment of the present application includes an accumulator initial air pressure detection device 400 and has all the functions of the accumulator initial air pressure detection device 400. The beneficial effects of the hydraulic system 600 can refer to the beneficial effects of the aforementioned accumulator initial air pressure detection device 400.

[0140] like Fig. 9As shown, the hydraulic system 600 may further include an operating component 650 and a solenoid valve 660 . The solenoid valve 660 may be used to control the on / off of the fluid path between the target pump 630 and the accumulator 620 and the fluid path between the target pump 630 and the operating component 650 .

[0141] Specifically, when the accumulator 620 needs to be filled with fluid (for example, when the pressure in the liquid chamber of the accumulator 620 is lower than the aforementioned first pressure P1), the solenoid valve 660 is energized, the fluid path between the target pump 630 and the accumulator 620 is connected, and the target pump 630 fills the accumulator 620 with fluid; when the accumulator 620 is completely filled with fluid (for example, when the pressure in the liquid chamber of the accumulator 620 reaches the aforementioned second pressure P2), the solenoid valve 660 loses power, the fluid path between the target pump 630 and the accumulator 620 is disconnected, the fluid path between the target pump 630 and the operating component 650 is connected, and the hydraulic oil output by the target pump 630 can be used for the operation of the operating component 650.

[0142] like Fig. 9 As shown, the operating component 650 may include a radiator 651, a brake valve 652, a drive axle 653, a parking disc 654, and a flushing valve group 655. The target pump 630 provides power for the radiator 651, the brake valve 652, the drive axle 653, the parking disc 654, and the flushing valve group 655 to ensure that the radiator 651, the brake valve 652, the drive axle 653, the parking disc 654, and the flushing valve group 655 can work normally.

[0143] like Fig. 9 As shown, the hydraulic system 600 may further include a filter 670 , and the filter 670 may be used to filter the hydraulic oil output by the target pump 630 .

[0144] like Fig. 9 As shown, the hydraulic system 600 may further include an oil tank 680, and the oil tank 680 is used to supply hydraulic oil and receive return oil.

[0145] like Fig. 9 As shown, the hydraulic system 600 may further include a relief valve 690 , which may prevent the hydraulic oil pressure in the hydraulic system 600 from being excessive.

[0146] like Fig. 9 As shown, the hydraulic system 600 may further include a manual pressure relief valve 700 , which connects the oil tank 680 and the accumulator 620 . The staff may manually relieve the pressure of the accumulator 620 by operating the manual pressure relief valve 700 .

[0147] like Fig. 9 As shown, the hydraulic system 600 may further include a parking valve 710. When the vehicle needs to be parked, the parking valve 710 is energized or de-energized to control the on / off of the hydraulic circuit, thereby achieving parking braking to prevent the vehicle from slipping.

[0148] like Fig. 9 As shown, the hydraulic system 600 may further include a one-way valve 720 , which is disposed in the fluid path between the target pump 630 and the accumulator 620 , and may be used to prevent the hydraulic oil in the fluid chamber of the accumulator 620 from flowing back into the target pump 630 .

[0149] The embodiment of the present application also provides an engineering machine, which includes the hydraulic system 600 as described in the previous embodiment and has all the functions and beneficial effects of the hydraulic system 600.

[0150] In one embodiment, the construction machinery may include an excavator, a crane, etc.

[0151] Fig.10 This is a structural block diagram of an electronic device provided by an exemplary embodiment of the present application. Fig.10 As shown, the electronic device 800 may include: a processor 810; and a memory 820 for storing instructions executable by the processor 810; wherein the processor 810 is used to execute the accumulator initial air pressure detection method of the above embodiment.

[0152] The processor 810 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 800 to perform desired functions.

[0153] The memory 820 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 810 may run the program instructions to implement the control method of each embodiment of the present application described above and / or other desired functions. Various contents such as input signals, signal components, noise components, etc. may also be stored in the computer-readable storage medium.

[0154] In one example, the electronic device 800 may further include: an input device 830 and an output device 840 , and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0155] When the controller is a stand-alone device, the input device 830 may be a communication network connector for receiving collected input signals from the first device and the second device.

[0156] In addition, the input device 830 may also include, for example, a keyboard, a mouse, and the like.

[0157] The output device 840 can output various information to the outside, including the determined distance information, direction information, etc. The output device 840 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0158] Of course, to simplify, Fig.10 Only some of the components related to the present application in the electronic device 800 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application situations, the electronic device 800 may also include any other appropriate components.

[0159] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0160] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0161] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0162] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0163] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0164] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0165] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A method for detecting the initial air pressure of an accumulator, characterized in that: include: obtaining an initial volume of a gas chamber of the accumulator; filling the liquid chamber of the accumulator with liquid; Obtaining a first pressure of a liquid chamber of the accumulator at a first time point; Acquire a second pressure of the liquid chamber of the accumulator at a second time point; wherein the second pressure is greater than the first pressure; Acquire a volume change of a gas chamber of the accumulator between the first time node and the second time node; An initial gas pressure of the gas chamber of the accumulator is obtained according to the initial volume, the first pressure, the second pressure, and the volume change.

2. The accumulator initial air pressure detection method according to claim 1, characterized in that: The obtaining of the volume change of the gas chamber of the accumulator between the first time node and the second time node comprises: Obtaining a filling flow rate of the accumulator between the first time node and the second time node; The volume change is obtained according to the first time node, the second time node and the filling flow rate.

3. The method for detecting the initial gas pressure of an accumulator according to claim 2, characterized in that: The obtaining of the filling flow rate of the accumulator between the first time node and the second time node comprises: Obtaining a first filling liquid flow rate between the first time node and a third time node; Obtaining a second filling liquid flow rate between the third time node and the fourth time node; Acquire a third filling liquid flow rate between the fourth time node and the second time node; The obtaining of the volume change according to the first time node, the second time node and the filling flow rate includes: Obtaining the volume change according to the first time node, the third time node, the fourth time node, the second time node, the first liquid filling flow rate, the second liquid filling flow rate, and the third liquid filling flow rate; Among them, the first time node, the third time node, the fourth time node, and the second time node are different time nodes in time sequence; the first filling flow rate is less than the second filling flow rate; and the third filling flow rate is less than the second filling flow rate.

4. The method for detecting the initial gas pressure of an accumulator according to claim 3, characterized in that: The obtaining of the first filling flow rate between the first time node and the third time node comprises: Controlling the target pump to charge the accumulator with a first displacement between the first time node and a third time node; wherein the first displacement is less than a preset displacement threshold; Acquiring a first rotation speed and a preset volumetric efficiency of the target pump; The first filling flow rate is obtained according to the first displacement, the first time node, the third time node, the first rotational speed, and the preset volumetric efficiency.

5. The method for detecting the initial gas pressure of an accumulator according to claim 3, characterized in that: The obtaining of the second filling flow rate between the third time node and the fourth time node comprises: Controlling the target pump to charge the accumulator with a second displacement between the third time node and the fourth time node; wherein the second displacement is greater than a preset displacement threshold; Acquiring a second rotation speed and a preset volumetric efficiency of the target pump; The second filling flow rate is obtained according to the second displacement, the third time node, the fourth time node, the second rotational speed and the preset volumetric efficiency.

6. The method for detecting the initial gas pressure of an accumulator according to claim 3, characterized in that: The obtaining of the third filling flow rate between the fourth time node and the second time node comprises: Controlling the target pump to charge the accumulator with a third displacement between the fourth time node and the second time node; wherein the third displacement is less than a preset displacement threshold; Acquiring a third speed and a preset volumetric efficiency of the target pump; The third filling flow rate is obtained according to the third displacement, the fourth time node, the second time node, the third rotational speed and the preset volumetric efficiency.

7. An accumulator initial air pressure detection device, characterized in that: include: An initial volume module, used for obtaining the initial volume of the gas chamber of the accumulator; A first liquid filling module, used for filling the liquid chamber of the accumulator with liquid; A first pressure module, used for obtaining a first pressure of the gas chamber of the accumulator at a first time node; A second pressure module, used to obtain a second pressure of the gas chamber of the accumulator at a second time node; wherein the second pressure is greater than the first pressure; A volume change module, used for obtaining a volume change of the gas chamber of the accumulator between the first time node and the second time node; An initial air pressure module is used to obtain the initial air pressure of the gas chamber of the accumulator according to the initial volume, the first pressure, the second pressure and the volume change.

8. A hydraulic system, characterized in that: include: Power source; Accumulator; a target pump connected to the power source, the target pump being used to charge the accumulator; A pressure sensor, used to detect the pressure of the liquid chamber of the accumulator; The accumulator initial air pressure detection device according to claim 7, wherein the power source, the target pump and the pressure sensor are communicatively connected.

9. The hydraulic system according to claim 8, characterized in that: The hydraulic system further comprises: Job components; The solenoid valve is used to control the on / off of the fluid path between the target pump and the accumulator and the fluid path between the target pump and the operating component.

10. An engineering machine, characterized in that: Comprising a hydraulic system as claimed in claim 8 or 9.

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