A method and device for analyzing a hydraulic device

Abstract

The embodiment of the present invention provides a method and device for analyzing a hydraulic device, including: determining at least one first pressure drop flow curve corresponding to the hydraulic pipeline of the hydraulic device; determining the liquid flow corresponding to the first design pressure value of the hydraulic pipeline according to the at least one first pressure drop flow curve; obtaining the first design parameter of the hydraulic actuator of the hydraulic device, and determining the response time of the hydraulic device according to the liquid flow and the first design parameter; and determining that the hydraulic device meets the design requirements when the response time is less than or equal to the preset time. By analyzing and calculating the simulation results of the oil circuit design model in the hydraulic device and the design parameters of the hydraulic device, the response time of the hydraulic device can be analyzed and calculated, thereby verifying the design of the hydraulic device. During the verification process, there is no need to simulate the complete results of the entire hydraulic device, thereby reducing the computing resources required to verify the hydraulic device and shortening the development cycle of the hydraulic device.

Description

Technical Field

[0001] The invention relates to the field of model analysis, and in particular to a hydraulic device analysis method and device. Background Art

[0002] The research and development process of hydraulic devices usually goes through the stages of conceptual design, detailed design, design verification, and design confirmation. During the design verification stage, the response time of the hydraulic device will be analyzed to verify whether it can meet the design requirements.

[0003] In the related art, the model design of each part of the hydraulic device is usually completed in the detailed design stage of the hydraulic device, and simulation is performed based on the overall model data of the hydraulic device, so as to determine the response time of the hydraulic device by simulating the movement of the hydraulic oil in the hydraulic device. For example, the overall model data of the hydraulic device is simulated by computational fluid dynamics, and the simulation effect of the flow of hydraulic oil in the hydraulic device can be simulated through simulation based on computational fluid dynamics, so as to determine the response time of the hydraulic device.

[0004] However, simulation tools such as computational fluid dynamics need to be based on the overall design model of the hydraulic device, and the hydraulic device usually has a complex structure. Therefore, massive calculations are required during the simulation process, resulting in slow simulation output results, which reduces the research and development efficiency of the hydraulic device. Summary of the invention

[0005] In view of this, the present invention aims to propose a hydraulic device analysis method and device to solve the problem of low efficiency in determining the response time of the hydraulic device according to the design model of the hydraulic device in the prior art.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A method for analyzing a hydraulic device, the method comprising:

[0008] Simulating the oil circuit design model of the hydraulic device to determine at least one first pressure drop flow curve corresponding to the hydraulic pipeline of the hydraulic device; wherein one first pressure drop flow curve corresponds to one working temperature;

[0009] Determining a liquid flow rate corresponding to a first design pressure value of the hydraulic pipeline according to the at least one first pressure drop flow rate curve;

[0010] Acquire a first design parameter of a hydraulic actuator of the hydraulic device, and determine a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein one response time corresponds to one working temperature;

[0011] When the response time is less than or equal to the preset time, it is determined that the hydraulic device meets the design requirements.

[0012] A hydraulic device analysis device, the device comprising:

[0013] A curve module is used to simulate the oil circuit design model of the hydraulic device to determine at least one first pressure drop flow curve corresponding to the hydraulic pipeline of the hydraulic device; wherein one first pressure drop flow curve corresponds to one working temperature;

[0014] a flow module, configured to determine a liquid flow corresponding to a first design pressure value of the hydraulic pipeline according to the at least one first pressure drop flow curve;

[0015] A time module, used to obtain a first design parameter of a hydraulic actuator of the hydraulic device, and determine a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein one response time corresponds to one working temperature;

[0016] The determination module is used to determine that the hydraulic device meets the design requirements when the response time is less than or equal to a preset time.

[0017] Compared with the prior art, the hydraulic device analysis method and device described in the present invention have the following advantages:

[0018] In summary, an embodiment of the present invention provides a method for analyzing a hydraulic device, including: simulating an oil circuit design model of a hydraulic device, determining at least one first pressure drop flow curve corresponding to a hydraulic pipeline of the hydraulic device; wherein a first pressure drop flow curve corresponds to a working temperature; determining a liquid flow corresponding to a first design pressure value of the hydraulic pipeline according to at least one first pressure drop flow curve; obtaining a first design parameter of a hydraulic actuator of the hydraulic device, and determining a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein a response time corresponds to a working temperature; and determining that the hydraulic device meets the design requirements when the response time is less than or equal to a preset time. In an embodiment of the present invention, by simulating the oil circuit design model in the hydraulic device, the response time of the hydraulic device can be analyzed and calculated according to the simulation results and the design parameters of the hydraulic device, thereby verifying the design of the hydraulic device. During the verification process, it is not necessary to simulate the complete results of the entire hydraulic device, thereby reducing the computing resources required for verifying the hydraulic device, improving the efficiency of verifying the hydraulic device, and thus shortening the development cycle of the hydraulic device and saving development costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 A flowchart of a method for analyzing a hydraulic device according to an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of a hydraulic device provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of a pressure drop flow curve provided in an embodiment of the present application;

[0023] Figure 4 A flowchart of another method for analyzing a hydraulic device according to an embodiment of the present invention;

[0024] Figure 5 A flowchart of the steps of another hydraulic device analysis method according to an embodiment of the present invention;

[0025] Figure 6 This is a structural block diagram of a hydraulic device analysis device described in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] Reference Figure 1 , showing a flow chart of steps of a hydraulic device analysis method described in an embodiment of the present invention.

[0029] Step 101, simulating an oil circuit design model of a hydraulic device to determine at least one first pressure drop flow curve corresponding to a hydraulic pipeline of the hydraulic device; wherein a first pressure drop flow curve corresponds to an operating temperature.

[0030] Reference Figure 2 , Figure 2 A schematic diagram of a hydraulic device provided in an embodiment of the present application is shown. Figure 2As shown, the hydraulic device usually includes three main parts: hydraulic control mechanism 1, hydraulic pipeline 2 and hydraulic actuator 3. Among them, the hydraulic control mechanism 3 is used to apply pressure to the hydraulic oil in the hydraulic device, so that the hydraulic oil flows through the hydraulic pipeline 2 under pressure and acts on the hydraulic actuator 3. The hydraulic oil is injected into the hydraulic chamber 31 of the hydraulic actuator 3, pushing the piston 32 located on the hydraulic actuator 3 to move, thereby driving the actuator 33 to act. After the hydraulic control mechanism 1 stops applying pressure to the hydraulic oil, the damping member 34 pushes the actuator 33 and the piston 32 back to the initial position. For example, the locking of the clutch or the movement of the fork in the vehicle gearbox is driven by the hydraulic device. The hydraulic actuator includes a hydraulic chamber, a piston, a clutch plate and a damper.

[0031] Generally speaking, hydraulic devices need to meet certain design requirements, including the response time of the hydraulic device, which refers to the time required for the hydraulic device to push the piston in the hydraulic actuator to move to a specified position. Therefore, during the design process of the hydraulic device, the design scheme of the hydraulic device needs to be verified to determine whether the design scheme can meet the design requirements.

[0032] Since the design parameters of the hydraulic pipeline, such as the length and diameter, will affect the local loss and along-the-way loss of the hydraulic oil when it moves in the hydraulic pipeline, and the local loss and along-the-way loss of the hydraulic pipeline will affect the performance of the hydraulic pipeline, the performance is specifically manifested as a pressure drop flow curve, wherein the pressure drop flow curve contains the corresponding relationship between the pressure drop and the flow rate, the pressure drop refers to the difference between the pressure value at the hydraulic oil input end and the pressure value at the hydraulic oil output end of the hydraulic pipeline, for example, the pressure value at the hydraulic oil input end is 10 bar, and the pressure value at the hydraulic oil output end is 0 bar, then the corresponding pressure drop is 10 bar; the flow rate refers to the volume of hydraulic oil flowing through the hydraulic pipeline per unit time.

[0033] Since hydraulic devices often need to work at different temperatures, and hydraulic oil has different physical properties such as viscosity at different temperatures due to physical property limitations, different pressure drop flow curves will correspond to different temperatures of hydraulic oil in the hydraulic pipeline. Therefore, it is necessary to determine the first pressure drop flow curves corresponding to multiple different temperatures, so that in the subsequent verification process, according to the first pressure drop flow curves corresponding to multiple different temperatures, it can be verified whether the response time of the hydraulic device at different temperatures can meet the design requirements.

[0034] Reference Figure 3 , Figure 3 A schematic diagram of a pressure drop flow curve provided in an embodiment of the present application is shown in FIG. Figure 3As shown, when the preset working temperature range of the hydraulic device is -30 degrees Celsius to 90 degrees Celsius, several working temperatures are selected from the preset working temperature range, and the first pressure drop flow curves corresponding to the various working temperatures are drawn respectively. Among them, the thin dotted line a is the pressure drop flow curve of -30 degrees Celsius, the thick dotted line b is the pressure drop flow curve corresponding to -20 degrees Celsius, the thin solid line c is the pressure drop flow curve corresponding to 0 degrees Celsius, the thick solid line d is the pressure drop flow curve corresponding to 20 degrees Celsius, the thin dotted line e is the pressure drop flow curve corresponding to 60 degrees Celsius, and the thick dotted line f is the pressure drop flow curve corresponding to 90 degrees Celsius.

[0035] Step 102: Determine the liquid flow corresponding to the first design pressure value of the hydraulic pipeline according to the at least one first pressure drop flow curve.

[0036] The first design pressure value is the pressure value that the hydraulic control mechanism can provide to the hydraulic oil in the hydraulic pipeline, which is equivalent to the pressure value of the hydraulic oil input into the hydraulic pipeline. After the design scheme of the hydraulic device is completed, since the specifications of the hydraulic oil pump and other components constituting the hydraulic control mechanism have been determined, the first design pressure value that the hydraulic control mechanism can provide is also determined.

[0037] When the hydraulic device is working, the hydraulic oil will be injected into the hydraulic cavity of the hydraulic actuator through the hydraulic pipeline. Therefore, the liquid flow in the hydraulic pipeline determines the response time of the hydraulic device. When the liquid flow in the hydraulic pipeline is large, the hydraulic oil can be injected into the hydraulic cavity faster, so that the piston can move to the preset position faster and the response speed is faster.

[0038] Therefore, in order to determine the response speed of the hydraulic device, it is necessary to determine the liquid flow rate of the hydraulic oil in the hydraulic pipeline under the action of the first design pressure value.

[0039] Specifically, the first design pressure value may be matched with the first pressure drop flow curve to determine the corresponding liquid flow in the hydraulic pipeline under the first design pressure value. It should be noted that, when multiple first pressure drop flow curves are determined according to multiple different operating temperatures, the first design pressure value needs to be matched with each first pressure drop flow curve to obtain multiple liquid flow rates, wherein one liquid flow rate corresponds to one operating temperature.

[0040] Step 103, obtaining a first design parameter of a hydraulic actuator of the hydraulic device, and determining a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein one response time corresponds to one working temperature.

[0041] Since the hydraulic actuator is equivalent to the load in the hydraulic device, when other conditions remain unchanged and only the load in the hydraulic device is increased (i.e., the design of the hydraulic actuator is changed so that its piston is more difficult to be pushed to the preset position), the response time of the hydraulic device will increase, making its response speed slower; and when other conditions remain unchanged and only the load in the hydraulic device is reduced (i.e., the design of the hydraulic actuator is changed so that its piston is easier to be pushed to the preset position), the response time of the hydraulic device will be reduced, making its response speed faster.

[0042] Therefore, in order to determine the response time of the hydraulic device, the first design parameter of the hydraulic actuator of the hydraulic device can be obtained, and the liquid flow determined by the first design pressure value and the first design parameter are calculated together to determine the response time of the hydraulic device.

[0043] It should be noted that, in step 101, multiple first pressure drop flow curves may be determined according to multiple operating temperatures, and then, in step 102, multiple liquid flow rates are determined according to the first design pressure value, wherein the liquid flow rate has a one-to-one correspondence with the operating temperature. Therefore, in the embodiment of the present application, multiple response times having a one-to-one correspondence with the liquid flow rate can be calculated according to each liquid flow rate and the first design parameter, and then, the response time also has a one-to-one correspondence with the operating temperature.

[0044] Step 104: When the response time is less than or equal to a preset time, determining that the hydraulic device meets the design requirements.

[0045] When designing a hydraulic device, it is usually necessary to make its response time meet the preset time to provide the required performance. For example, for a vehicle's automatic transmission (AT), a hydraulic device is usually used to control the engagement of the clutch, and then the gear shift is achieved by controlling the engagement of the clutch. If the hydraulic device responds too slowly, the clutch in the transmission may not be fully engaged when the transmitter is outputting power, and the load cannot be provided to the engine, causing the engine speed to suddenly increase, which not only affects the user experience, but also easily causes damage to the engine.

[0046] Therefore, after determining the response time, the response time can be compared with the preset time to determine whether the response time that the hydraulic device can provide in the working process can meet the design requirements. In this way, the design scheme of the hydraulic device can be verified. If it is determined that the response time is less than or equal to the preset time, it means that the currently designed hydraulic device can meet the design requirements, and the subsequent design finalization, production and other links can be continued.

[0047] In summary, an embodiment of the present invention provides a method for analyzing a hydraulic device, including: simulating an oil circuit design model of a hydraulic device, determining at least one first pressure drop flow curve corresponding to a hydraulic pipeline of the hydraulic device; wherein a first pressure drop flow curve corresponds to a working temperature; determining a liquid flow corresponding to a first design pressure value of the hydraulic pipeline according to at least one first pressure drop flow curve; obtaining a first design parameter of a hydraulic actuator of the hydraulic device, and determining a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein a response time corresponds to a working temperature; and determining that the hydraulic device meets the design requirements when the response time is less than or equal to a preset time. In an embodiment of the present invention, by simulating the oil circuit design model in the hydraulic device, the response time of the hydraulic device can be analyzed and calculated according to the simulation results and the design parameters of the hydraulic device, thereby verifying the design of the hydraulic device. During the verification process, it is not necessary to simulate the complete results of the entire hydraulic device, thereby reducing the computing resources required for verifying the hydraulic device, improving the efficiency of verifying the hydraulic device, and thus shortening the development cycle of the hydraulic device and saving development costs.

[0048] Reference Figure 4 , is a flowchart of the steps of another hydraulic device analysis method described in an embodiment of the present invention.

[0049] Step 201 : inputting the oil circuit design model of the hydraulic device into a computational fluid dynamics model to determine a first local loss and a first along-the-line loss corresponding to the oil circuit design model.

[0050] When a fluid moves, due to the influence of its own viscosity and the roughness of the pipe wall, friction will be generated between the fluid and the pipe wall and between the fluid particles. This friction that hinders the movement of the fluid along the process is called the longitudinal resistance. The energy loss caused by the moving fluid overcoming the longitudinal resistance is called the longitudinal loss. Its size is proportional to the length of the process.

[0051] In addition, since there may be bends in the pipeline and the cross-sectional shapes at different locations in the pipe may not be completely consistent, when the fluid flows in the pipeline, the fluid will also produce a flow separation effect to form a vortex area, or cause the local flow structure to adjust sharply, intensifying the friction in the fluid and generating a large mechanical energy consumption. This energy loss is called local loss.

[0052] Since the fluid will suffer from along-the-way loss and local loss when flowing through the pipeline, when the pressure of the fluid flowing into the inlet end of the pipeline is constant, the fluid will suffer different along-the-way losses and local losses when passing through pipelines of different shapes, which will cause differences in the flow rate of the fluid when flowing through different pipelines. For example, the longer the pipeline, the greater the corresponding along-the-way loss. Therefore, when the pressure at the input end is the same, the longer the pipeline usually has a smaller flow rate.

[0053] In an embodiment of the present application, in order to determine the along-the-line loss and local loss of the hydraulic pipeline, the pipeline design model of the hydraulic pipeline can be simulated by computational fluid dynamics to determine the along-the-line loss and local loss corresponding to the hydraulic pipeline according to the shape of the hydraulic pipeline.

[0054] Computational Fluid Dynamics (CFD) is an emerging interdisciplinary subject that integrates fluid mechanics and computer science. It uses computer computing power to obtain approximate solutions to fluid control equations based on the simulation of 3D models. The principle of computational fluid dynamics and related computational heat transfer and computational combustion is to use numerical methods to solve nonlinear simultaneous differential equations of mass, energy, components, momentum and user-defined scalars. The solution results can predict the details of the flow, heat transfer, mass transfer, combustion and other processes, and become a powerful tool for process device optimization and quantitative design.

[0055] However, since 3D models are usually complex in structure, the simulation and simulation of 3D models (such as hydraulic devices) through computational fluid dynamics will inevitably consume a lot of computing resources, resulting in the output of the simulated structure being too slow. R&D personnel often need to wait for simulation results, which seriously slows down the progress of product development. For example, in order to determine the response time of a hydraulic device, it is necessary to simulate the complete design model of the hydraulic device.

[0056] In an embodiment of the present application, only the oil circuit design model of the hydraulic device is simulated by computational fluid dynamics, without the need to simulate the entire hydraulic device, which greatly reduces the amount of calculation required for simulation by computational fluid dynamics when analyzing the hydraulic device.

[0057] Step 202: determining at least one first pressure drop flow curve corresponding to the hydraulic pipeline according to the first local loss and the first along-the-line loss.

[0058] like Figure 3 As shown, the horizontal axis of the pressure drop flow curve is the liquid flow of the hydraulic pipeline, and the vertical axis is the pressure drop between the input and output ends of the hydraulic pipeline, that is, the pressure drop. It should be noted that the pressure drop value corresponding to the vertical axis is determined based on the output end pressure value of 0 bar. That is to say, if the pressure drop value is 10 bar, it means that the pressure value of the input end of the hydraulic pipeline is 10 bar, and the pressure value of the output end is 0 bar.

[0059] Specifically, the first pressure drop flow curve can be obtained by simulating and analyzing the pipeline design model of the hydraulic pipeline through computational fluid dynamics, or it can be calculated according to the along-the-line loss and local loss corresponding to the hydraulic pipeline by other methods. The embodiments of the present application are not specifically limited here.

[0060] It should be noted that since the working temperature of the hydraulic device is not a constant value, it is generally within an working temperature range, such as -30 degrees Celsius to 90 degrees Celsius. Therefore, multiple temperature points can be selected within the preset working temperature range to construct the first pressure drop flow curves corresponding to the hydraulic oil at different temperatures flowing through the hydraulic pipeline, and obtain multiple first pressure drop flow curves corresponding to multiple temperature points.

[0061] Step 203: Select a first design pressure value from the design pressure range of the hydraulic pipeline.

[0062] The design pressure range is the range of pressure values ​​that the hydraulic control mechanism in the hydraulic device can provide. Generally speaking, after the design of the hydraulic control mechanism is completed, its energy supply strategy and the device models used have been determined, and the performance of the hydraulic control mechanism has been determined. The technicians can determine the design pressure value range corresponding to the hydraulic control mechanism based on the performance of the hydraulic control mechanism.

[0063] The technician can select any pressure value from the design pressure range as the first design pressure value, and calculate the response time of the entire hydraulic device in the subsequent steps when the hydraulic control mechanism in the hydraulic device provides the first design pressure value. For example, if the design pressure range is 0 to 50 bar, 20 bar can be selected, and in the subsequent steps, it is calculated whether the response time of the hydraulic device can meet the design requirements when the hydraulic control mechanism in the hydraulic device outputs 20 bar.

[0064] It should be noted that the technicians may also directly use the limit pressure value that the hydraulic control mechanism can provide as the first design pressure value, and then determine in subsequent steps whether the response time of the hydraulic device can meet the design requirements when the hydraulic control mechanism outputs the best performance.

[0065] Step 204, matching the first design pressure value with the at least one first pressure drop flow curve to determine at least one liquid flow corresponding to the hydraulic pipeline under the first design pressure value; wherein the at least one first pressure drop flow curve has a one-to-one correspondence with the at least one liquid flow.

[0066] Since the ordinate in the first pressure drop flow curve is the difference between the liquid pressure at the input end and the liquid pressure at the output end of the hydraulic pipeline, and the liquid pressure at the output end is 0, the ordinate in the first pressure drop flow curve can actually represent the pressure value at the input end of the hydraulic pipeline, which can be matched with the first design pressure value, thereby determining the liquid flow corresponding to the first design pressure value.

[0067] like Figure 3 As shown, the pressure drop flow curve diagram includes multiple first pressure drop flow curves. If the first design pressure value is determined to be 10 bar, then Figure 3 When matching -30 degrees Celsius (line a), the corresponding flow rate is 4.5, and when matching 0 degrees Celsius (line c), the corresponding flow rate is about 12.

[0068] Step 205: determining a filling volume according to the cross-sectional area of ​​the hydraulic chamber and the piston displacement distance.

[0069] The first design parameters of the hydraulic actuator include the initial volume of the hydraulic chamber, the cross-sectional area of ​​the hydraulic chamber, and the piston displacement distance. During the operation of the hydraulic actuator, the hydraulic oil flowing out of the output end of the hydraulic pipeline will enter the hydraulic chamber of the hydraulic actuator and gradually fill the space in the hydraulic chamber, pushing the piston in the hydraulic chamber to reach the piston displacement distance, thereby completing the actuation of the hydraulic actuator.

[0070] Therefore, the volume of hydraulic oil that needs to be filled in the hydraulic chamber can be determined by the cross-sectional area of ​​the hydraulic chamber and the piston displacement distance. The volume of hydraulic oil that needs to be filled in the hydraulic chamber is usually composed of two parts. The first part is the piston coverage volume that the piston needs to sweep when it reaches the preset position, and the initial volume that needs to be filled in the hydraulic chamber before the hydraulic oil pushes the piston. Specifically, since the hydraulic chamber is generally cylindrical in shape, the piston coverage volume that the piston needs to sweep when it reaches the preset position can be determined based on the product of the cross-sectional area of ​​the hydraulic chamber and the piston displacement distance.

[0071] Step 206, calculate the sum of the filling volume and the initial volume of the hydraulic chamber, and determine at least one response time of the hydraulic device based on the ratio of the sum to the at least one liquid flow rate; wherein the at least one liquid flow rate and the at least one response time have a one-to-one correspondence.

[0072] Furthermore, since there may be a certain initial space in the hydraulic chamber, the hydraulic oil cannot push the piston to move if the hydraulic oil does not fill the initial space. Therefore, it is also necessary to determine the initial volume of the hydraulic oil in the hydraulic chamber. The initial volume can be determined by calculating the space between the connection position of the hydraulic line outlet end and the piston position in the three-dimensional model of the hydraulic chamber.

[0073] The filling volume can be obtained by adding the initial volume to the piston coverage volume determined in the above step 205, wherein the filling volume refers to the total volume of hydraulic oil that needs to be filled in the hydraulic chamber in order for the hydraulic device to complete a response.

[0074] Furthermore, the response time of the hydraulic device can be determined by the ratio of the filling volume to the liquid flow rate. For example, if the liquid flow rate is 10 liters per minute and the filling volume is 0.1 liter, the calculated response time is 0.6 seconds.

[0075] The above steps of determining the response time can be described by the following calculation formula:

[0076] T=(V+S×L)÷Q

[0077] Among them, T is the response time, V is the initial volume of the hydraulic chamber, S is the cross-sectional area of ​​the hydraulic chamber, L is the piston displacement distance, and Q is the liquid flow rate.

[0078] It should be noted that when there are multiple liquid flow rates, such as multiple liquid flow rates corresponding to multiple operating temperatures, each of the multiple liquid flow rates needs to be substituted into the above formula for calculation to determine multiple response times, where each response time corresponds to an operating temperature.

[0079] Step 207: When the response time is less than or equal to the preset time, determine that the hydraulic device meets the design requirements.

[0080] In an embodiment of the present application, after determining at least one response time corresponding to the working temperature, each response time can be compared with the preset time. If all response times are less than or equal to the preset time, it can be determined that when the hydraulic control mechanism outputs the first design pressure value, the hydraulic device can meet the required response time requirements at various working temperatures, and it can be determined that the overall design of the hydraulic device meets the requirements.

[0081] In summary, an embodiment of the present invention provides a method for analyzing a hydraulic device, including: simulating an oil circuit design model of a hydraulic device, determining at least one first pressure drop flow curve corresponding to a hydraulic pipeline of the hydraulic device; wherein a first pressure drop flow curve corresponds to a working temperature; determining a liquid flow corresponding to a first design pressure value of the hydraulic pipeline according to at least one first pressure drop flow curve; obtaining a first design parameter of a hydraulic actuator of the hydraulic device, and determining a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein a response time corresponds to a working temperature; and determining that the hydraulic device meets the design requirements when the response time is less than or equal to a preset time. In an embodiment of the present invention, by simulating the oil circuit design model in the hydraulic device, the response time of the hydraulic device can be analyzed and calculated according to the simulation results and the design parameters of the hydraulic device, thereby verifying the design of the hydraulic device. During the verification process, it is not necessary to simulate the complete results of the entire hydraulic device, thereby reducing the computing resources required for verifying the hydraulic device, improving the efficiency of verifying the hydraulic device, and thus shortening the development cycle of the hydraulic device and saving development costs.

[0082] Reference Figure 5 , Figure 5 This is a flowchart of the steps of another hydraulic device analysis method described in an embodiment of the present invention.

[0083] Step 301 , simulating an oil circuit design model of a hydraulic device to determine at least one first pressure drop flow curve corresponding to a hydraulic pipeline of the hydraulic device; wherein one first pressure drop flow curve corresponds to one working temperature.

[0084] This step can refer to step 201 to step 207, and will not be described in detail in the embodiment of the present application.

[0085] Step 302: Determine the liquid flow corresponding to the first design pressure value of the hydraulic pipeline according to the at least one first pressure drop flow curve.

[0086] Since the larger the selected first design pressure value is, the shorter the calculated response time is, a smaller pressure value is first selected from the design pressure range as the first design pressure value, and the selected pressure value is gradually increased. In this way, the minimum pressure value required to be output by the hydraulic control mechanism that can enable the hydraulic device to meet the design requirements can be determined, which is convenient for technical personnel to better understand the performance of the hydraulic device.

[0087] Specifically, the design pressure interval can be divided into a plurality of pressure values ​​to be selected with a preset step length. For example, if the design pressure interval is 0 to 10 bar, the design pressure interval can be divided into 10 pressure values ​​to be selected with 1 bar as the preset step length. The first design pressure value can be determined as the smallest value among the pressure values ​​to be selected. Then, the first design pressure value is matched with at least one first pressure drop flow curve to determine at least one liquid flow corresponding to the hydraulic pipeline at the first design pressure value.

[0088] Step 303, obtaining a first design parameter of a hydraulic actuator of the hydraulic device, and determining a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein one response time corresponds to one working temperature.

[0089] This step can refer to step 201 to step 207, and will not be described in detail in the embodiment of the present application.

[0090] Step 304: When there is a response time greater than the preset time in the response time, the first design pressure value is updated based on the design pressure interval to obtain a second design pressure value, and at least one response time corresponding to the second design pressure value is determined based on the second design pressure value, until the second design pressure value is equal to the limit pressure value or at least one response time corresponding to the second design pressure value is less than or equal to the preset time.

[0091] Within the design pressure range, if you want to adjust the pressure value output by the hydraulic control mechanism, you only need to change the request value of the pressure valve in the hydraulic control mechanism. Compared with the adjustment of hydraulic pipelines and hydraulic actuators, it is relatively easy to adjust the pressure value output by the hydraulic control mechanism. Therefore, when the response time of the hydraulic device cannot meet the design requirements, you can give priority to increasing the pressure value output by the hydraulic control mechanism to reduce the difficulty of adjusting the design scheme.

[0092] Specifically, if there is a response time that cannot meet the design requirements among at least one response time calculated according to the first design pressure value, it means that the hydraulic control mechanism cannot meet the requirements for the performance of the hydraulic device within the preset working temperature range when outputting the first design pressure value. At this time, the first design pressure value can be updated, and a pressure value greater than the first design pressure value can be selected from the pressure values ​​to be selected as the second design pressure value. And the corresponding response time is recalculated according to the second design pressure value in the manner of steps 201 to 207. And the above steps are repeated until the second design pressure value is equal to the limit pressure value (i.e., the upper limit value of the design pressure range) or at least one response time corresponding to the second design pressure value is less than or equal to the preset time.

[0093] Step 305, when the second design pressure value is equal to the limit pressure value and there is a response time greater than the preset time in at least one response time corresponding to the second design pressure value, update the first local loss and the first along-the-line loss to obtain the second local loss and the second along-the-line loss respectively, and update the at least one first pressure drop flow curve based on the second local loss and the second along-the-line loss to obtain at least one second pressure drop flow curve.

[0094] Compared with adjusting the pressure value output by the hydraulic control mechanism, adjusting the hydraulic pipeline design is usually more complicated and will be subject to various restrictions such as pipeline layout space. At the same time, the design of the hydraulic actuator is more complicated. Since the hydraulic actuator usually includes an actuator unit that needs to be pushed, for example, in a vehicle's automatic transmission, the actuator unit can be a complex structure such as a shift fork and a clutch plate. Therefore, the design of the hydraulic actuator is more difficult to adjust, and it is necessary to change the structures of multiple components at the same time to adjust the design of the hydraulic actuator.

[0095] In an embodiment of the present application, if the second design pressure value is equal to the limit pressure value, and at least one response time corresponding to the second design pressure value has a response time greater than the preset time, it means that the output pressure of the hydraulic control mechanism has reached the limit and it is difficult to continue to increase the pressure. At this time, you can consider adjusting the design of the hydraulic pipeline.

[0096] Specifically, since the loss of hydraulic oil in the hydraulic pipeline mainly includes along-the-line loss and local loss, the first along-the-line loss and / or the first local loss determined in the above step can be reduced to obtain the second along-the-line loss and the second local loss, and at least one first pressure drop flow curve is updated according to the second along-the-line loss and the second local loss to obtain at least one second pressure drop flow curve. Thus, at least one response time is recalculated according to the at least one second pressure drop flow curve and the second design pressure value that reaches the limit pressure value.

[0097] Optionally, step 305 may further include:

[0098] Sub-step 3051, adjusting the pipeline length and / or pipeline diameter of the oil circuit design model, and updating the first local loss and the first along-the-line loss based on the adjusted oil circuit design model to obtain a second local loss and a second along-the-line loss.

[0099] Since the local loss is highly correlated with the pipeline diameter, and the along-the-line loss is highly correlated with the pipeline length, when adjusting the oil circuit design model, the pipeline length and / or pipeline diameter may also be adjusted, and the various losses of the oil circuit design model may be re-determined in the manner in step 201 to obtain a second local loss and a second along-the-line loss. At least one first pressure drop flow curve is updated based on the second local loss and the second along-the-line loss to obtain at least one second pressure drop flow curve.

[0100] Step 306: Determine at least one response time corresponding to the second pressure drop flow curve based on the second design pressure value and the at least one second pressure drop flow curve.

[0101] The method of determining at least one response time corresponding to the second pressure drop flow curve according to the second design pressure value and at least one second pressure drop flow curve is similar to the method of determining the response time in steps 201 to 207, and will not be repeated in the embodiments of the present application.

[0102] Step 307: When there is a response time greater than the preset time in at least one response time corresponding to the second pressure drop flow curve, and the second local loss and the second along-the-line loss both reach the maximum design values, adjust the first design parameter to obtain the second design parameter, and determine at least one response time corresponding to the second design parameter based on the second design parameter, the second local loss, the second along-the-line loss and the second design pressure value.

[0103] Since local losses and along-the-line losses have limit values ​​in the design of hydraulic pipelines, local losses and along-the-line losses cannot be reduced indefinitely. For example, the layout positions of the hydraulic control mechanism and the hydraulic actuator limit the minimum length of the hydraulic pipeline, and the layout space of the hydraulic pipeline limits the maximum diameter of the hydraulic pipeline, and so on.

[0104] The second local loss and / or the second along-the-path loss can be gradually reduced, and the corresponding response time can be calculated. If the response time corresponding to a combination of the second local loss and the second along-the-path loss is less than or equal to the preset time, it can be determined that the current design scheme meets the design requirements.

[0105] If the second local loss and the second along-the-path loss have been adjusted to the minimum value, and the corresponding response time still cannot meet the design requirements, the design scheme of the hydraulic actuator can be further adjusted.

[0106] Specifically, since the initial volume, hydraulic chamber cross-sectional area and piston displacement distance in the hydraulic actuator will affect the response time of the hydraulic device, the design of the hydraulic actuator can be adjusted by at least one of reducing the initial volume of the hydraulic actuator, reducing the hydraulic chamber cross-sectional area and reducing the piston displacement distance, so that the hydraulic device meets the design requirements.

[0107] Step 308: When at least one response time corresponding to the second design parameter is less than the preset time, it is determined that the hydraulic device meets the design requirements.

[0108] In summary, an embodiment of the present invention provides a method for analyzing a hydraulic device, including: simulating an oil circuit design model of a hydraulic device, determining at least one first pressure drop flow curve corresponding to a hydraulic pipeline of the hydraulic device; wherein a first pressure drop flow curve corresponds to a working temperature; determining a liquid flow corresponding to a first design pressure value of the hydraulic pipeline according to at least one first pressure drop flow curve; obtaining a first design parameter of a hydraulic actuator of the hydraulic device, and determining a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein a response time corresponds to a working temperature; and determining that the hydraulic device meets the design requirements when the response time is less than or equal to a preset time. In an embodiment of the present invention, by simulating the oil circuit design model in the hydraulic device, the response time of the hydraulic device can be analyzed and calculated according to the simulation results and the design parameters of the hydraulic device, thereby verifying the design of the hydraulic device. During the verification process, it is not necessary to simulate the complete results of the entire hydraulic device, thereby reducing the computing resources required for verifying the hydraulic device, improving the efficiency of verifying the hydraulic device, and thus shortening the development cycle of the hydraulic device and saving development costs.

[0109] Based on the above embodiments, the embodiments of the present invention further provide a hydraulic device analysis device.

[0110] refer to Figure 6 , showing a structural block diagram of a hydraulic device analysis device according to an embodiment of the present invention:

[0111] The curve module 401 is used to simulate the oil circuit design model of the hydraulic device to determine at least one first pressure drop flow curve corresponding to the hydraulic pipeline of the hydraulic device; wherein one first pressure drop flow curve corresponds to one working temperature;

[0112] A flow module 402, configured to determine a liquid flow corresponding to a first design pressure value of the hydraulic pipeline according to the at least one first pressure drop flow curve;

[0113] A time module 403 is used to obtain a first design parameter of a hydraulic actuator of the hydraulic device, and determine a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein one response time corresponds to one working temperature;

[0114] The determination module 404 is used to determine that the hydraulic device meets the design requirements when the response time is less than or equal to the preset time.

[0115] Optionally, the curve module includes:

[0116] A loss submodule, used for inputting the oil circuit design model of the hydraulic device into a computational fluid dynamics model to determine a first local loss and a first along-the-path loss corresponding to the oil circuit design model;

[0117] The curve submodule is used to determine at least one first pressure drop flow curve corresponding to the hydraulic pipeline according to the first local loss and the first along-the-way loss.

[0118] Optionally, the flow module includes:

[0119] A first pressure submodule, used for selecting a first design pressure value from a design pressure range of the hydraulic pipeline;

[0120] A flow submodule is used to match the first design pressure value with the at least one first pressure drop flow curve to determine at least one liquid flow corresponding to the hydraulic pipeline under the first design pressure value; wherein the at least one first pressure drop flow curve has a one-to-one correspondence with the at least one liquid flow.

[0121] Optionally, the first design parameter includes an initial volume of the hydraulic chamber, a cross-sectional area of ​​the hydraulic chamber, and a piston displacement distance, and the time module includes:

[0122] A volume submodule, for determining a filling volume according to a cross-sectional area of ​​the hydraulic chamber and a displacement distance of the piston;

[0123] A time submodule is used to calculate the sum of the filling volume and the initial volume of the hydraulic chamber, and determine at least one response time of the hydraulic device based on the ratio of the sum to the at least one liquid flow rate; wherein the at least one liquid flow rate and the at least one response time have a one-to-one correspondence.

[0124] Optionally, the device further comprises:

[0125] A pressure update time determination module is used to update the first design pressure value based on the design pressure interval to obtain a second design pressure value when there is a response time greater than a preset time in the response time, and determine at least one response time corresponding to the second design pressure value based on the second design pressure value, until the second design pressure value is equal to the limit pressure value or at least one response time corresponding to the second design pressure value is less than or equal to the preset time.

[0126] Optionally, the device further comprises:

[0127] a curve updating module, configured to update the first local loss and the first along-the-line loss to obtain the second local loss and the second along-the-line loss respectively, and to update the at least one first pressure drop flow curve based on the second local loss and the second along-the-line loss to obtain at least one second pressure drop flow curve, when the second design pressure value is equal to the limit pressure value and at least one response time corresponding to the second design pressure value has a response time greater than the preset time;

[0128] The curve update time determination module is used to determine at least one response time corresponding to the second pressure drop flow curve based on the second design pressure value and the at least one second pressure drop flow curve.

[0129] Optionally, the device further comprises:

[0130] a parameter update time determination module, configured to adjust the first design parameter to obtain a second design parameter when there is a response time greater than the preset time in at least one response time corresponding to the second pressure drop flow curve and the second local loss and the second along-the-line loss both reach a maximum design value, and determine at least one response time corresponding to the second design parameter based on the second design parameter, the second local loss, the second along-the-line loss and the second design pressure value;

[0131] The design determination module is used to determine that the hydraulic device meets the design requirements when at least one response time corresponding to the second design parameter is less than the preset time.

[0132] Optionally, the curve updating module includes:

[0133] The loss updating submodule is used to adjust the pipeline length and / or pipeline diameter of the oil circuit design model, and update the first local loss and the first along-the-way loss based on the adjusted oil circuit design model to obtain the second local loss and the second along-the-way loss.

[0134] In summary, an embodiment of the present invention provides a hydraulic device analysis device, including: simulating an oil circuit design model of a hydraulic device to determine at least one first pressure drop flow curve corresponding to the hydraulic pipeline of the hydraulic device; wherein one first pressure drop flow curve corresponds to an operating temperature; determining the liquid flow corresponding to the first design pressure value of the hydraulic pipeline according to at least one first pressure drop flow curve; obtaining a first design parameter of a hydraulic actuator of the hydraulic device, and determining the response time of the hydraulic device according to the liquid flow and the first design parameter; wherein one response time corresponds to an operating temperature; and determining that the hydraulic device meets the design requirements when the response time is less than or equal to a preset time. In an embodiment of the present invention, by simulating the oil circuit design model in the hydraulic device, the response time of the hydraulic device can be analyzed and calculated according to the simulation results and the design parameters of the hydraulic device, thereby verifying the design of the hydraulic device. During the verification process, it is not necessary to simulate the complete results of the entire hydraulic device, thereby reducing the computing resources required for verifying the hydraulic device, improving the efficiency of verifying the hydraulic device, and thus shortening the development cycle of the hydraulic device and saving development costs.

[0135] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned device embodiments and will not be repeated here.

[0136] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0137] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for analyzing a hydraulic device, characterized in that: The method comprises: Simulating the oil circuit design model of the hydraulic device to determine at least one first pressure drop flow curve corresponding to the hydraulic pipeline of the hydraulic device; wherein one first pressure drop flow curve corresponds to one working temperature; Inputting the oil circuit design model of the hydraulic device into a computational fluid dynamics model to determine a first local loss and a first along-the-path loss corresponding to the oil circuit design model; Determine at least one first pressure drop flow curve corresponding to the hydraulic pipeline according to the first local loss and the first along-the-line loss; determine the liquid flow corresponding to the first design pressure value of the hydraulic pipeline according to the at least one first pressure drop flow curve; Selecting a first design pressure value from the design pressure range of the hydraulic pipeline; Matching the first design pressure value with the at least one first pressure drop flow curve to determine at least one liquid flow corresponding to the hydraulic pipeline under the first design pressure value; wherein the at least one first pressure drop flow curve has a one-to-one correspondence with the at least one liquid flow; obtaining a first design parameter of a hydraulic actuator of the hydraulic device, and determining a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein one response time corresponds to one working temperature; the first design parameter includes an initial volume of the hydraulic chamber, a cross-sectional area of ​​the hydraulic chamber, and a piston displacement distance; Determining a filling volume according to the cross-sectional area of ​​the hydraulic chamber and the displacement distance of the piston; Calculating a sum of the filling volume and the initial volume of the hydraulic chamber, and determining at least one response time of the hydraulic device according to a ratio of the sum to the at least one liquid flow rate; wherein the at least one liquid flow rate and the at least one response time have a one-to-one correspondence; When the response time is less than or equal to the preset time, it is determined that the hydraulic device meets the design requirements.

2. The method according to claim 1, characterized in that The method further comprises: In the case that there is a response time greater than the preset time in the response time, the first design pressure value is updated based on the design pressure interval to obtain a second design pressure value, and at least one response time corresponding to the second design pressure value is determined based on the second design pressure value, until the second design pressure value is equal to the limit pressure value or at least one response time corresponding to the second design pressure value is less than or equal to the preset time.

3. The method according to claim 2, characterized in that The method further comprises: When the second design pressure value is equal to the limit pressure value and there is a response time greater than the preset time in at least one response time corresponding to the second design pressure value, the first local loss and the first along-the-line loss are updated to obtain the second local loss and the second along-the-line loss respectively, and the at least one first pressure drop flow curve is updated based on the second local loss and the second along-the-line loss to obtain at least one second pressure drop flow curve; At least one response time corresponding to the second pressure drop flow curve is determined based on the second design pressure value and the at least one second pressure drop flow curve.

4. The method according to claim 3, characterized in that After determining at least one response time corresponding to the second pressure drop flow curve based on the second design pressure value and the at least one second pressure drop flow curve, the method further includes: In the case that there is a response time greater than the preset time in at least one response time corresponding to the second pressure drop flow curve, and the second local loss and the second along-the-line loss both reach the maximum design value, adjusting the first design parameter to obtain a second design parameter, and determining at least one response time corresponding to the second design parameter based on the second design parameter, the second local loss, the second along-the-line loss and the second design pressure value; When at least one response time corresponding to the second design parameter is less than the preset time, it is determined that the hydraulic device meets the design requirements.

5. The method according to claim 3, characterized in that: The updating of the first local loss and the first along-the-route loss to obtain a second local loss and a second along-the-route loss respectively comprises: The pipeline length and / or pipeline diameter of the oil circuit design model is adjusted, and the first local loss and the first along-the-way loss are updated based on the adjusted oil circuit design model to obtain a second local loss and a second along-the-way loss.

6. A hydraulic device analysis device, characterized in that: The device comprises: A curve module is used to simulate the oil circuit design model of the hydraulic device to determine at least one first pressure drop flow curve corresponding to the hydraulic pipeline of the hydraulic device; wherein one first pressure drop flow curve corresponds to one working temperature; The curve module includes: A loss submodule, used for inputting the oil circuit design model of the hydraulic device into a computational fluid dynamics model to determine a first local loss and a first along-the-path loss corresponding to the oil circuit design model; A curve submodule, configured to determine at least one first pressure drop flow curve corresponding to the hydraulic pipeline according to the first local loss and the first along-the-way loss; a flow module, configured to determine a liquid flow corresponding to a first design pressure value of the hydraulic pipeline according to the at least one first pressure drop flow curve; Selecting a first design pressure value from the design pressure range of the hydraulic pipeline; Matching the first design pressure value with the at least one first pressure drop flow curve to determine at least one liquid flow corresponding to the hydraulic pipeline under the first design pressure value; wherein the at least one first pressure drop flow curve has a one-to-one correspondence with the at least one liquid flow; a time module, used to obtain a first design parameter of a hydraulic actuator of the hydraulic device, and determine a response time of the hydraulic device according to the liquid flow and the first design parameter; wherein one response time corresponds to one working temperature; and the first design parameter includes an initial volume of a hydraulic chamber, a cross-sectional area of ​​the hydraulic chamber, and a piston displacement distance; Determining a filling volume according to the cross-sectional area of ​​the hydraulic chamber and the displacement distance of the piston; Calculating a sum of the filling volume and the initial volume of the hydraulic chamber, and determining at least one response time of the hydraulic device according to a ratio of the sum to the at least one liquid flow rate; wherein the at least one liquid flow rate and the at least one response time have a one-to-one correspondence; The determination module is used to determine that the hydraulic device meets the design requirements when the response time is less than or equal to a preset time.

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