Constant-power pump operation regeneration flow control method, system and equipment and storage medium

Abstract

The invention provides a constant-power pump operation regeneration flow control method, system and equipment and a storage medium, and belongs to the field of engineering equipment power control. The constant-power pump operation regeneration flow control method comprises the steps that in response to operation equipment entering an operation regeneration state and meeting an operation regeneration rotating speed increasing working condition, flow adjustment is conducted on a constant-power pump, so that the flow of the constant-power pump is kept constant in the engine rotating speed increasing process; if the driver set rotating speed is smaller than or equal to the preset idle speed, the pump flow adjusting value is calculated through the pump torque, the pump pressure and the driver set rotating speed; if the driver set rotating speed is larger than the preset idle speed, the pump flow adjusting value is calculated through the current engine rotating speed. According to the operation regeneration flow control method, in the operation regeneration process, through the thought of constant flow control, power limitation adjustment on the constant-power pump is calculated, finally, the pump displacement is reduced, the hoisting speed is not suddenly changed, and the whole vehicle operation efficiency is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of engineering equipment power control, and specifically to a method, system, electronic device and computer-readable storage medium for controlling regeneration flow of a constant power pump operation. Background Art

[0002] A crane is a lifting machine commonly used for lifting and moving heavy objects. During the operation of a crane, when the carbon load accumulates to a certain extent, it generally requires manual parking regeneration. During regeneration, the crane cannot work, but this will affect the normal operation of the crane. Operation regeneration technology can reduce this impact, reduce environmental pollution and energy waste caused by engine speed drop and flameout, and improve operation efficiency and stability. However, the problem with operation regeneration is that during the operation of the crane, the instantaneous hydraulic pump demand torque is greater than the engine output torque, which will cause the engine to drop and flameout, and cannot reliably guarantee the normal operation of the crane.

[0003] A constant power pump is a hydraulic pump that can maintain a relatively stable output power under different working conditions. Its working principle is to adjust the pump displacement to adapt to different load requirements, thereby maintaining a constant power output. This feature enables the constant power pump to maintain a stable power output by adjusting the displacement when facing complex working conditions, but it also requires precise control of the flow to avoid excess or insufficient power.

[0004] The Chinese patent application document with the publication number CN117432505A discloses a crane DPF operation regeneration control method and system, wherein the regeneration control method includes: S1, obtaining the value of the carbon model / counter, and determining that the carbon model / counter value reaches the threshold value C; S2, obtaining the current crane parameters, and determining that the current engine is in the hoisting operation operating condition; S3, based on the idle speed V1 of the current engine hoisting operation operating condition, increasing the idle speed V1 to the preset speed V2, heating the catalyst system in the form of exhaust gas, so that the catalyst system temperature reaches the preset temperature value T1 of the post-injection in the cylinder; S4, controlling the release of the post-injection amount in the cylinder, so that the temperature of the post-treatment system is maintained at the preset temperature value T2, and lasting for a preset time t; S5, controlling the engine to return to the idle speed V1 under the hoisting operation condition. It develops the minimum speed setting function under different combustion modes of the engine, and increases the exhaust energy by setting a reasonable engine speed during the operation regeneration process, so as to achieve the purpose of increasing the temperature of the DPF to automatically clean the internal carbon smoke, without the need for customers to actively perform parking regeneration, thereby extending the parking regeneration cycle. However, it is not suitable for flow control of constant power pumps, and there is no control mechanism to maintain lifting stability.

[0005] It can be seen that there is an urgent need to develop a new constant power pump operation regeneration flow control method, which can increase the lifting speed and improve the lifting quality by adjusting the constant power pump flow in the operation regeneration condition. Summary of the invention

[0006] The present application aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the present application provides a constant power pump operation regeneration flow control method, system, electronic device and computer readable storage medium. The operation regeneration flow control method calculates the power limit adjustment of the constant power pump through the idea of ​​constant flow control during the operation regeneration process, and finally reduces the pump displacement so that the lifting speed does not change suddenly, thereby ensuring the operation efficiency of the whole vehicle.

[0007] To achieve the above objectives, in a first aspect, the present application provides a method for controlling a regeneration flow rate of a constant power pump operation, comprising:

[0008] In response to the operating equipment entering an operating regeneration state and satisfying an operating regeneration speed increase condition, regulating the flow of the constant power pump so that the flow of the constant power pump remains constant during the engine speed increase process;

[0009] Among them, if the driver-set speed is less than or equal to the preset idle speed, the pump flow adjustment value is calculated according to the pump torque, pump pressure, and the driver-set speed; if the driver-set speed is greater than the preset idle speed, the pump flow adjustment value is calculated according to the current engine speed.

[0010] Preferably, the judgment condition for the working equipment to enter the working regeneration state includes: the working equipment meets the working conditions, and the engine DPF state signal value is 1.

[0011] Preferably, the operating conditions include: the engine torque is greater than a first torque threshold, the pump outlet pressure is greater than a first pressure threshold, and the pump torque is greater than a second torque threshold; wherein, the first torque threshold and the second torque threshold are both positive numbers, in units of Nm, and the first pressure threshold is a positive number, in units of bar.

[0012] Preferably, the judgment conditions for the operation regeneration speed increase condition include: the pump pressure is stable, the engine speed is stable, there is no rotation movement, the lifting operation has not timed out, and the regeneration speed is greater than the speed set by the driver.

[0013] Preferably, the operation regeneration flow control method is configured with a flow regulation interruption strategy, and the flow regulation interruption strategy includes:

[0014] Real-time acquisition of data information such as pump pressure, engine speed, whether there is a rotation action, whether the lifting operation has timed out, and whether the regeneration speed is greater than the speed set by the driver, in order to determine whether the regeneration speed increase condition is always met during the flow adjustment of the constant power pump;

[0015] If at any time, any of the judgment conditions for the operation regeneration speed increase condition is not met, the flow regulation process is exited.

[0016] Preferably, the judgment logic for the pump pressure stability includes: a first working condition: the pump pressure fluctuates within the range of a preset minimum value and a preset maximum value, or a second working condition: the absolute value of the difference between the current pump pressure and the pump pressure before a preset time is less than or equal to a preset pump pressure limit, or a third working condition: the absolute value of the difference between the current pump pressure and the pump pressure before a preset time is greater than the preset pump pressure limit but the duration is less than the preset duration. The first working condition, the second working condition and the third working condition all judge that the pump pressure is stable.

[0017] Preferably, the judgment logic for the engine speed to be stable includes: if the absolute value of the difference between the current engine speed and the engine speed before a preset time is less than or equal to the preset engine speed limit, or the absolute value of the difference between the current engine speed and the engine speed before a preset time is greater than the preset engine speed limit but the duration is less than the preset duration, the above two working conditions both judge that the engine speed is stable.

[0018] Preferably, the lifting operation is determined to be not timed out by the number of load mutations being less than a number threshold; wherein the load mutation situations include:

[0019] The difference between the speed set by the driver and the actual speed of the engine is greater than or equal to the first speed threshold,

[0020] or the engine load rate is greater than the first load rate threshold,

[0021] or the pump outlet pressure is greater than the second pressure threshold,

[0022] Or the actual engine speed is less than the second speed threshold and the engine load rate change is greater than the second load rate threshold.

[0023] Preferably, the step of calculating the pump flow adjustment value by the pump torque, the pump pressure and the speed set by the driver comprises:

[0024] The pump displacement is calculated by the pump torque and pump pressure. The calculation formula is as follows: ,in, is the pump displacement, is the pump torque, is the conversion coefficient between pump pressure and pump torque, is the pump efficiency coefficient, is the pump pressure;

[0025] The pump target flow rate is obtained by the pump displacement, and the calculation formula is as follows: ,in, is the pump target flow rate, is the pump displacement, Sets the speed for the driver.

[0026] The pump target displacement is calculated from the pump target flow rate. The calculation formula is as follows: ,in, is the pump target displacement, is the pump target flow rate, is the engine speed, is the pump efficiency coefficient;

[0027] The pump target torque is calculated from the pump target displacement, and the pump target current is obtained through the table lookup relationship between the pump target torque and the pump target current. The calculation formula is as follows: , ,in, is the pump target torque, is the pump target displacement, is the pump pressure, is the conversion coefficient between pump pressure and pump torque, is the pump target current, Represents the lookup table relationship between pump target torque and pump target current.

[0028] Preferably, the step of calculating the pump flow adjustment value according to the current engine speed comprises:

[0029] The pump target flow is obtained by looking up the relationship between the engine speed and the pump target flow, and the pump target current is calculated. The calculation formula is as follows: , , , , is the pump target displacement, is the pump target flow rate, is the engine speed, is the pump efficiency coefficient, is the pump target torque, is the pump target displacement, is the pump pressure, is the conversion coefficient between pump pressure and pump torque, is the pump target current, represents the lookup table relationship between pump target torque and pump target current, A lookup table representing the relationship between engine speed and pump target flow rate.

[0030] In a second aspect, the present application provides a constant power pump operation regeneration flow control system, comprising:

[0031] The data collection and analysis module is used to collect and analyze relevant data information for judging whether the operation equipment has entered the operation regeneration state, and to collect and analyze relevant data information for judging whether the operation regeneration speed increase condition is met;

[0032] a calculation module, for calculating a pump flow adjustment value by using pump torque, pump pressure, and the driver-set speed when the driver-set speed is less than or equal to the preset idle speed; and for calculating a pump flow adjustment value by using the current engine speed when the driver-set speed is greater than the preset idle speed;

[0033] The control module is used to adjust the flow of the constant power pump based on the pump flow adjustment value output by the calculation module, so that the flow of the constant power pump remains constant during the process of increasing the engine speed.

[0034] In a third aspect, the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to implement any of the above-mentioned operation regeneration flow control methods.

[0035] In a fourth aspect, the present application provides a computer-readable storage medium, including a computer program. When the computer program is run on a computer or a processor, the electronic device executes any of the above-described job regeneration flow control methods.

[0036] Based on the above technical solution, it can be seen that the constant power pump operation regeneration flow control method of the present application has at least one of the following beneficial effects compared with the prior art:

[0037] 1. The operation regeneration flow control method of the present application, in the operation regeneration process, through the idea of ​​constant flow control, calculates the power limit adjustment of the constant power pump in two cases, and finally reduces the pump displacement so that the lifting speed does not change suddenly, ensuring the whole vehicle operation efficiency and the stability of lifting;

[0038] 2. The operating regeneration flow control method of the present application, when the driver sets the speed to be less than or equal to the preset idle speed, calculates the pump flow adjustment value through the pump torque, pump pressure, and the driver-set speed. Because in this case, the operating equipment (such as a crane) is in a low-speed or idle operation state, and the demand on the hydraulic system is relatively small. At this time, the flow of the hydraulic pump needs to be accurately adjusted according to the actual load conditions to match the flow of the hydraulic pump with the actual demand to avoid unnecessary energy waste caused by excessive flow.

[0039] 3. The operating regeneration flow control method of the present application, when the driver sets the speed greater than the preset idle speed, calculates the target flow and target current through the relationship between the current engine speed and the target flow. Because in this case, the operating equipment (such as a crane) is in a relatively high speed operating state, and the demand on the hydraulic system is relatively large. At this time, the flow of the hydraulic pump needs to be adjusted according to the actual speed of the engine to ensure that the flow of the hydraulic pump matches the output capacity of the engine, so as to ensure that the hydraulic system can provide sufficient power and avoid a decrease in lifting efficiency due to insufficient flow.

[0040] 4. The operation regeneration flow control method of the present application is equipped with a flow regulation interruption strategy, which obtains data information such as pump pressure, engine speed, whether there is a rotation action, whether the lifting operation is overtime, and whether the regeneration speed is greater than the speed set by the driver in real time, so as to determine whether the operation regeneration speed increase condition is always met during the flow regulation of the constant power pump. If any of the judgment conditions of the operation regeneration speed increase condition is not met at any time, the flow regulation process is exited. It can ensure that the operation regeneration process is carried out under relatively stable and controllable conditions.

[0041] Other features and advantages of the present application will be described in the subsequent description, and in part will become apparent from the description, or it may be understood through the implementation of the present application that the objects and other advantages of the present application can be realized and obtained through the written description and the structures particularly pointed out in the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a flow chart of the regeneration flow control method of the constant power pump operation in this application. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0044] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application are also intended to include plural forms, unless the context clearly indicates other meanings.

[0045] In view of the shortcomings of the prior art, the purpose of this application is to provide a constant power pump operation regeneration flow control method, aiming to overcome the problem that the current operation regeneration control system has no control mechanism to maintain the stability of the hoisting, and cannot solve the problem of maintaining the stability of the hoisting speed by controlling the constant power pump flow.

[0046] The basic idea of ​​this application is to calculate the power limit adjustment of the constant power pump in two cases through the idea of ​​constant flow control. When the driver sets the speed less than or equal to the preset idle speed, the pump flow adjustment value is calculated by the pump torque, pump pressure, and the driver's set speed. Because in this case, the operating equipment (such as a crane) is in a low-speed or idle operation state, and the demand of the hydraulic system is small. At this time, the flow of the hydraulic pump needs to be accurately adjusted according to the actual load conditions, so that the flow of the hydraulic pump matches the actual demand, and avoid unnecessary energy waste caused by excessive flow. When the driver sets the speed greater than the preset idle speed, the target flow and target current are calculated by the current engine speed and target flow relationship. Because in this case, the operating equipment (such as a crane) is in a high-speed operation state, and the demand of the hydraulic system is large, at this time, the flow of the hydraulic pump needs to be adjusted according to the actual speed of the engine to ensure that the flow of the hydraulic pump matches the output capacity of the engine, so as to ensure that the hydraulic system can provide sufficient power and avoid the decrease in lifting efficiency due to insufficient flow. Finally, the pump displacement is reduced to ensure that the lifting speed has no sudden change, and the whole vehicle operation efficiency and lifting stability are guaranteed.

[0047] Embodiment 1

[0048] In order to develop a method for controlling the regeneration flow rate of a constant power pump, the present application conducts an in-depth study on the power limit regulation of the constant power pump and proposes a method for controlling the regeneration flow rate of a constant power pump.

[0049] Specifically, Figure 1 As shown, the present application provides a method for controlling regeneration flow rate of a constant power pump operation, comprising:

[0050] In response to the operating equipment entering an operating regeneration state and satisfying an operating regeneration speed increase condition, the constant power pump is flow-regulated so that the flow of the constant power pump remains constant during the engine speed increase process;

[0051] Optionally, the above-mentioned operating equipment may include but is not limited to: a crane, an excavator, a bulldozer, a loader and other equipment.

[0052] Among them, if the driver sets the speed less than or equal to the preset idle speed, the pump flow adjustment value is calculated by the pump torque, pump pressure, and the driver set speed; if the driver sets the speed greater than the preset idle speed, the pump flow adjustment value is calculated by the current engine speed. The driver sets the speed by the driver through the handle or button, and the set value is collected by the controller. The preset idle speed refers to the idle speed threshold set in the ECU, which can be selected in the range of 900-1300, in rpm.

[0053] Preferably, the operation regeneration flow control method is configured with a flow regulation interruption strategy, and the flow regulation interruption strategy includes:

[0054] Real-time acquisition of data information such as pump pressure, engine speed, whether there is a rotation action, whether the lifting operation has timed out, and whether the regeneration speed is greater than the speed set by the driver, in order to determine whether the regeneration speed increase condition is always met during the flow adjustment of the constant power pump;

[0055] If at any time, including the waiting stage before entering the regeneration flow control and the operation regeneration flow adjustment stage after entering the regeneration flow control, any of the judgment conditions for the operation regeneration speed increase condition is not met, the flow adjustment process will be exited. Return to the initial stage of regeneration flow control, that is, to determine whether the operation equipment has entered the operation regeneration state and meets the operation regeneration speed increase condition. By configuring the flow adjustment interruption strategy, it can be ensured that the operation regeneration process is carried out under relatively stable and controllable conditions.

[0056] Specifically, the judgment conditions for the operating equipment to enter the operating regeneration state include: the operating equipment meets the operating conditions, and the engine DPF state signal value is 1. The operating conditions include: the engine torque is greater than the first torque threshold, the pump outlet pressure is greater than the first pressure threshold, and the pump torque is greater than the second torque threshold; wherein the first torque threshold and the second torque threshold are both positive numbers, in Nm, and the first pressure threshold is a positive number, in bar.

[0057] Preferably, the operation regeneration flow control method can be applied to a crane, or an excavator, or a bulldozer, or a loader. In this embodiment, a flow control method applied to the crane hoisting regeneration (i.e., operation regeneration) process is described. Specifically, in this embodiment, the judgment conditions for the operation regeneration speed increase condition include: the pump pressure is stable, the engine speed is stable, there is no rotation action, the hoisting operation has not timed out, and the regeneration speed is greater than the speed set by the driver (the regeneration speed refers to the actual speed of the engine during the operation regeneration period). Among them, the judgment logic of pump pressure stability includes: the first working condition: the pump pressure fluctuates within the range of a preset minimum value and a preset maximum value, or the second working condition: the absolute value of the difference between the current pump pressure and the pump pressure before the preset time is less than or equal to the preset pump pressure limit (the preset time here refers to a very short period of time, such as 150ms-250ms, and the acquisition cycle of the controller is 10ms; the preset pump pressure limit can be set according to actual conditions, in order to also recognize the situation where the instantaneous change of pump pressure is small as the situation of stable pump pressure), or the third working condition: the absolute value of the difference between the current pump pressure and the pump pressure before the preset time is greater than the preset pump pressure limit but the duration is less than the preset duration (the difference between this situation and the second situation is that the instantaneous change of pump pressure is large, but this change is short-lived and lasts for a short time; the specific preset duration can be set according to actual conditions). The above first working condition, second working condition and third working condition all determine that the pump pressure is stable. The judgment logic for engine speed stability includes: if the absolute value of the difference between the current engine speed and the engine speed before a preset time is less than or equal to the preset engine speed limit (similarly, the preset time here refers to a very short period of time, the purpose is to also recognize the situation where the instantaneous change in speed is small as a stable speed situation), or the absolute value of the difference between the current engine speed and the engine speed before the preset time is greater than the preset engine speed limit but the duration is less than the preset duration (the difference between this situation and the first situation is that the instantaneous change in speed is large, but this change is short-lived and lasts for a short time; the specific preset duration can be set according to actual conditions), the above two working conditions both judge that the engine speed is stable.

[0058] Preferably, the lifting operation is determined to have not timed out by the number of load mutations being less than a threshold number, wherein the number of load mutations refers to a sudden change in the load of the operating equipment (such as a crane) during the lifting operation, such as a sudden increase or decrease in the weight of the heavy object, or unexpected resistance encountered during the lifting process. Load mutations usually cause the load of the hydraulic system and the engine to increase or decrease instantly, thereby affecting the stability and efficiency of the lifting. By limiting the number of load mutations, it is possible to ensure that the lifting operation is carried out under relatively stable and controllable conditions, avoid extending the operation time due to frequent load changes, and thus improve the operation efficiency; specifically, the load mutation situations include: the difference between the speed set by the driver and the actual engine speed is greater than or equal to the first speed threshold, the first speed threshold is a positive number, which can be set according to actual conditions, unit rpm, or the engine load rate is greater than the first load rate threshold, the first load rate threshold is a positive value, which can be set according to actual conditions, unit %, or the pump outlet pressure is greater than the second pressure threshold (when the outlet pressure of the hydraulic pump exceeds the preset value, it indicates that the hydraulic system may increase pressure due to increased load), the second pressure threshold is a positive number, which can be set according to actual conditions, unit bar, or the actual engine speed is less than the second speed threshold and the engine load rate change is greater than the second load rate threshold (when the engine speed decreases and the load rate change exceeds the preset value, it indicates that the engine may decrease in speed due to a sudden load change), the second speed threshold is a positive number, unit rpm, the second load rate threshold is a positive value, unit %, both of which can be set according to actual conditions.

[0059] Preferably, the step of calculating the pump flow adjustment value by the pump torque, the pump pressure and the speed set by the driver comprises:

[0060] The pump displacement is calculated by the pump torque and pump pressure. The calculation formula is as follows: ,in, is the pump displacement, is the pump torque, is the conversion coefficient between pump pressure and pump torque, is the pump efficiency coefficient, For pump pressure.

[0061] The pump target flow rate is obtained by the pump displacement, and the calculation formula is as follows: ,in, is the pump target flow rate, is the pump displacement, Sets the speed for the driver.

[0062] The pump target displacement is calculated from the pump target flow rate. The calculation formula is as follows: ,in, is the pump target displacement, is the pump target flow rate, is the engine speed, is the pump efficiency coefficient.

[0063] The pump target torque is calculated from the pump target displacement, and the pump target current is obtained through the table lookup relationship between the pump target torque and the pump target current. The calculation formula is as follows: , ,in, is the pump target torque, is the pump target displacement, is the pump pressure, is the conversion coefficient between pump pressure and pump torque, is the pump target current, Represents the lookup table relationship between the pump target torque and the pump target current. The pump target current can be determined quickly and accurately through the lookup table relationship between the pump target torque and the pump target current. This lookup table relationship is established based on experimental data and theoretical calculations. Through experimental data collection, theoretical model fitting and data collation, a quick query table is formed. The lookup table relationship is based on experimental data and theoretical calculations and can provide accurate target flow. In addition, the lookup table relationship can also be adjusted and optimized according to actual working conditions to meet different operating requirements.

[0064] Preferably, the step of calculating the pump flow adjustment value according to the current engine speed comprises:

[0065] The pump target flow is obtained by looking up the relationship between the engine speed and the pump target flow, and the pump target current is calculated. The calculation formula is as follows: , , , , is the pump target displacement, is the pump target flow rate, is the engine speed, is the pump efficiency coefficient, is the pump target torque, is the pump target displacement, is the pump pressure, is the conversion coefficient between pump pressure and pump torque, is the pump target current, represents the lookup table relationship between pump target torque and pump target current, Represents the lookup table relationship between engine speed and pump target flow. Through the lookup table relationship between engine speed and pump target flow, the target flow of the hydraulic pump can be determined quickly and accurately. This lookup table relationship is established based on experimental data and theoretical calculations. Through experimental data collection, theoretical model fitting and data collation, a quick query table is formed. In actual operation, by real-time monitoring of engine speed and querying the table, precise control of the hydraulic pump flow can be achieved, thereby achieving the goal of constant flow control. The lookup table relationship is based on experimental data and theoretical calculations, and can provide accurate target flow. In addition, the lookup table relationship can also be adjusted and optimized according to actual working conditions to meet different operating requirements.

[0066] Embodiment 2

[0067] This embodiment provides a constant power pump operation regeneration flow control system, including:

[0068] The data collection and analysis module is used to collect and analyze relevant data information for judging whether the operation equipment has entered the operation regeneration state, and to collect and analyze relevant data information for judging whether the operation regeneration speed increase condition is met;

[0069] a calculation module, for calculating a pump flow adjustment value by using pump torque, pump pressure, and the driver-set speed when the driver-set speed is less than or equal to the preset idle speed; and for calculating a pump flow adjustment value by using the current engine speed when the driver-set speed is greater than the preset idle speed;

[0070] The control module is used to adjust the flow of the constant power pump based on the pump flow adjustment value output by the calculation module, so that the flow of the constant power pump remains constant during the process of increasing the engine speed.

[0071] The constant power pump operation regeneration flow control system of this embodiment has at least the following beneficial effects compared to the prior art: during the operation regeneration process, the operation regeneration flow control system calculates the power limit adjustment of the constant power pump in two cases through the idea of ​​constant flow control, and finally reduces the pump displacement so that the lifting speed has no sudden change, thereby ensuring the operation efficiency of the whole vehicle and the stability of the lifting; when the driver sets the speed to be less than or equal to the preset idle speed, the operation regeneration flow control system calculates the pump flow adjustment value through the pump torque, pump pressure, and the driver-set speed, because in this case, the operating equipment (such as a crane) is in a low-speed or idle operation state, and the demand on the hydraulic system is relatively small. At this time, the flow of the hydraulic pump needs to be accurately adjusted according to the actual load conditions to match the flow of the hydraulic pump with the actual demand to avoid unnecessary energy waste caused by excessive flow. The operation regeneration flow control system, when the driver sets the speed greater than the preset idle speed, calculates the target flow and target current through the relationship between the current engine speed and the target flow. Because in this case, the operation equipment (such as a crane) is in a high speed operation state, and the hydraulic system has a large demand. At this time, the flow of the hydraulic pump needs to be adjusted according to the actual speed of the engine to ensure that the flow of the hydraulic pump matches the output capacity of the engine, so as to ensure that the hydraulic system can provide sufficient power and avoid the reduction of lifting efficiency due to insufficient flow. The operation regeneration flow control system is equipped with a flow regulation interruption strategy, which obtains data information such as pump pressure, engine speed, whether there is a rotation action, whether the lifting operation has timed out, and whether the regeneration speed is greater than the speed set by the driver in real time, so as to determine whether the operation regeneration speed increase condition is always met during the flow regulation of the constant power pump. If any of the judgment conditions of the operation regeneration speed increase condition is not met at any time, the flow regulation process is exited. It can ensure that the operation regeneration process is carried out under relatively stable and controllable conditions.

[0072] Embodiment 3

[0073] This embodiment provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and capable of running on the processor, the processor executes the program to implement the operation regeneration flow control method in the above-mentioned embodiment 1, and realizes the following functions: through the idea of ​​constant flow control, the power limit adjustment of the constant power pump is calculated in two cases. When the speed set by the driver is less than or equal to the preset idle speed, the pump flow adjustment value is calculated by the pump torque, pump pressure, and the speed set by the driver. Because in this case, the operating equipment (such as a crane) is in a low-speed or idle operation state, the demand of the hydraulic system is small. At this time, the flow of the hydraulic pump needs to be accurately adjusted according to the actual load situation, so that the flow of the hydraulic pump matches the actual demand, and avoids unnecessary energy waste caused by excessive flow. When the speed set by the driver is greater than the preset idle speed, the target flow and target current are calculated by the relationship between the current engine speed and the target flow. Because in this case, the operating equipment (such as a crane) is in a high-speed operation state, the demand of the hydraulic system is large. At this time, the flow of the hydraulic pump needs to be adjusted according to the actual speed of the engine to ensure that the flow of the hydraulic pump matches the output capacity of the engine, so as to ensure that the hydraulic system can provide sufficient power and avoid the decrease in lifting efficiency due to insufficient flow. Finally, the pump displacement is reduced to ensure that the lifting speed does not change suddenly, thus ensuring the whole vehicle operation efficiency and the stability of the lifting. Specifically, the electronic device can be a controller in a specific device.

[0074] Embodiment 4

[0075] Based on the same technical concept, the embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is run on a computer or a processor, the computer or the processor executes the steps of the above-mentioned constant flow control method. And realize the following functions: through the idea of ​​constant flow control, the power limit adjustment of the constant power pump is calculated in two cases. When the driver sets the speed less than or equal to the preset idle speed, the pump flow adjustment value is calculated by the pump torque, pump pressure, and the driver set speed. Because in this case, the operating equipment (such as a crane) is in a low-speed or idle operation state, the demand of the hydraulic system is small. At this time, the flow of the hydraulic pump needs to be accurately adjusted according to the actual load situation, so that the flow of the hydraulic pump matches the actual demand, and avoids unnecessary energy waste caused by excessive flow. When the driver sets the speed greater than the preset idle speed, the target flow and target current are calculated by the current engine speed and target flow relationship. Because in this case, the operating equipment (such as a crane) is in a high-speed operation state, the demand of the hydraulic system is large. At this time, the flow of the hydraulic pump needs to be adjusted according to the actual speed of the engine to ensure that the flow of the hydraulic pump matches the output capacity of the engine, so as to ensure that the hydraulic system can provide sufficient power and avoid the decline in lifting efficiency due to insufficient flow. Ultimately, the pump displacement is reduced to ensure that the lifting speed does not change suddenly, thus ensuring the operating efficiency of the entire vehicle and the stability of the lifting.

[0076] The above describes specific embodiments of the present application. In addition, the processes depicted in the drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0077] In the description of the embodiments of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the embodiments of the present application, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in the embodiments of the present application and the features of the different embodiments or examples, without contradicting each other.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, and do not include any ordering. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features and are used to distinguish each other. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0079] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred implementation of the embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0080] The above description is only a preferred embodiment of the embodiments of the present application and is not intended to limit the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. A method for controlling the regeneration flow rate of a constant power pump operation, characterized in that: include: In response to the operating equipment entering an operating regeneration state and satisfying an operating regeneration speed increase condition, the constant power pump is flow-regulated so that the flow of the constant power pump remains constant during the engine speed increase process; Among them, if the driver-set speed is less than or equal to the preset idle speed, the pump flow adjustment value is calculated according to the pump torque, pump pressure and the driver-set speed; if the driver-set speed is greater than the preset idle speed, the pump flow adjustment value is calculated according to the current engine speed.

2. The method for controlling the operation regeneration flow rate according to claim 1, characterized in that: The judgment condition that the working equipment enters the working regeneration state includes: the working equipment meets the working condition, and the engine DPF state signal value is 1.

3. The method for controlling the operation regeneration flow rate according to claim 2, characterized in that: The operation conditions include: the engine torque is greater than a first torque threshold, the pump outlet pressure is greater than a first pressure threshold, and the pump torque is greater than a second torque threshold; wherein, the first torque threshold and the second torque threshold are both positive numbers, in units of Nm, and the first pressure threshold is a positive number, in units of bar.

4. The method for controlling the operation regeneration flow rate according to claim 1, characterized in that: The judgment conditions for the operation regeneration speed increase condition include: the pump pressure is stable, the engine speed is stable, there is no rotation action, the lifting operation has not timed out, and the regeneration speed is greater than the speed set by the driver.

5. The method for controlling the operation regeneration flow rate according to claim 4, characterized in that: The operation regeneration flow control method is configured with a flow regulation interruption strategy, and the flow regulation interruption strategy includes: Real-time acquisition of data information such as the pump pressure, the engine speed, the presence or absence of the rotation action, whether the hoisting operation has timed out, and whether the regeneration speed is greater than the speed set by the driver, so as to determine whether the regeneration speed increase condition of the operation is always met during the flow regulation of the constant power pump; If at any time, any one of the judgment conditions for the operation regeneration speed increase condition is not met, the flow regulation process is exited.

6. The method for controlling the operation regeneration flow rate according to claim 5, characterized in that: The judgment logic for the pump pressure stability includes: a first working condition: the pump pressure fluctuates within the range of a preset minimum value and a preset maximum value, or a second working condition: the absolute value of the difference between the current pump pressure and the pump pressure before a preset time is less than or equal to a preset pump pressure limit, or a third working condition: the absolute value of the difference between the current pump pressure and the pump pressure before the preset time is greater than the preset pump pressure limit but the duration is less than the preset duration. The first working condition, the second working condition and the third working condition all judge that the pump pressure is stable.

7. The method for controlling the operation regeneration flow rate according to claim 6, characterized in that: The judgment logic for the engine speed to be stable includes: the fourth working condition: the absolute value of the difference between the current engine speed and the engine speed before the preset time is less than or equal to the preset engine speed limit, or the fifth working condition: the absolute value of the difference between the current engine speed and the engine speed before the preset time is greater than the preset engine speed limit but the duration is less than the preset duration. Both the fourth working condition and the fifth working condition judge that the engine speed is stable.

8. The method for controlling the operation regeneration flow rate according to claim 7, characterized in that: The lifting operation is judged to be within the time limit when the number of load mutations is less than the number threshold. The load mutation situations include: The difference between the driver set speed and the actual engine speed is greater than or equal to a first speed threshold, or the engine load rate is greater than the first load rate threshold, or the pump outlet pressure is greater than the second pressure threshold, Or the actual engine speed is less than a second speed threshold and the engine load rate change is greater than a second load rate threshold.

9. The method for controlling the operation regeneration flow rate according to claim 1, characterized in that: The step of calculating the pump flow adjustment value by using the pump torque, the pump pressure, and the speed set by the driver comprises: The pump displacement is calculated by the pump torque and the pump pressure, and the calculation formula is as follows: ,in, is the pump displacement, is the pump torque, is the conversion coefficient between the pump pressure and the pump torque, is the pump efficiency coefficient, for said pump pressure; The pump target flow rate is obtained by the pump displacement, and the calculation formula is as follows: ,in, is the pump target flow rate, setting a speed for the driver; The pump target displacement is calculated from the pump target flow rate, and the calculation formula is as follows: ,in, is the target displacement of the pump, is the engine speed; The pump target torque is calculated from the pump target displacement, and the pump target current is obtained by looking up the relationship between the pump target torque and the pump target current. The calculation formula is as follows: , ,in, is the pump target torque, is the pump target current, The lookup table relationship between the pump target torque and the pump target current is represented.

10. The method for controlling the operation regeneration flow rate according to claim 1, characterized in that: The steps for calculating the pump flow adjustment value based on the current engine speed include: The pump target flow is obtained by looking up the relationship between the engine speed and the pump target flow, and the pump target current is calculated. The calculation formula is as follows: , , , , is the pump target displacement, is the pump target flow rate, is the engine speed, is the pump efficiency coefficient, is the pump target torque, is the pump pressure, is the conversion coefficient between pump pressure and pump torque, is the pump target current, represents the lookup table relationship between the target torque of the pump and the target current of the pump, A table lookup relationship representing the engine speed and the pump target flow rate.

11. A constant power pump operation regeneration flow control system, characterized in that: include: The data collection and analysis module is used to collect and analyze relevant data information for judging whether the operation equipment has entered the operation regeneration state, and to collect and analyze relevant data information for judging whether the operation regeneration speed increase condition is met; A calculation module, used for calculating a pump flow adjustment value through pump torque, pump pressure and the driver-set speed when the driver-set speed is less than or equal to a preset idle speed; and, when the driver-set speed is greater than the preset idle speed, calculating the pump flow adjustment value according to the current engine speed; The control module is used to adjust the flow of the constant power pump based on the pump flow adjustment value output by the calculation module, so that the flow of the constant power pump remains constant during the process of increasing the engine speed.

12. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to implement the operation regeneration flow control method according to any one of claims 1 to 10.

13. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is run on a computer or a processor, the computer or the processor executes the job regeneration flow control method according to any one of claims 1 to 10.

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