Methods, devices, engineering machinery, and media for determining pump pressure in hydraulic systems

Abstract

This invention relates to the field of data processing technology, and discloses a method, apparatus, construction machinery, and medium for determining pump pressure in a hydraulic system. The method includes: when a first pressure detection device corresponding to a target auxiliary pump is detected to be in a fault state, acquiring the output torque of the engine side connected to the hydraulic system and the first input torque corresponding to each of the other auxiliary pumps; calculating the second input torque corresponding to the target auxiliary pump based on the output torque and the first input torque corresponding to each of the other auxiliary pumps; and calculating the current pump pressure of the target auxiliary pump based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump. This invention provides accurate pressure data for the stable operation of the hydraulic system after the pressure detection device on the target auxiliary pump malfunctions, avoiding safety risks, ensuring the performance stability of the construction machinery, and contributing to extending the service life of the entire construction machinery.

Description

Technical Field

[0001] This invention relates to the field of data processing technology, specifically to a method, apparatus, engineering machinery, and medium for determining pump pressure in hydraulic systems. Background Technology

[0002] In the hydraulic systems of construction machinery, pressure sensors have various applications, including detecting the hydraulic system pressure of hydraulic excavators, the hydraulic pump pressure of concrete mixer trucks, and the air pressure system of bulldozers. These sensors are crucial for ensuring the normal operation and safety of construction machinery. Construction machinery pressure sensors are very important devices, characterized by the following key features: First, they possess high accuracy and reliability, guaranteeing the normal operation and safety of the machinery. Furthermore, they have a long service life and low maintenance costs, contributing to a longer lifespan and lower operating costs for the machinery.

[0003] Taking excavators as an example of construction machinery, pressure sensors on excavators are generally used to measure the oil pressure in the hydraulic system. These pressure sensors are installed in the hydraulic oil tank, hydraulic pump, hydraulic cylinder, and other critical components. Once a pressure sensor malfunctions, it will affect the overall operating efficiency and control performance of the machinery, and may even affect its service life. Therefore, determining the oil pressure in the hydraulic system under pressure sensor failure conditions is of great significance for the safe and stable operation of construction machinery. Summary of the Invention

[0004] In view of this, the present invention provides a method, device, construction machinery and medium for determining pump pressure in a hydraulic system, in order to solve the problem in the related art that when the pressure sensor installed in the hydraulic system of construction machinery fails, it will affect the operating efficiency and control performance of the entire working machinery, and may even affect the service life of the construction machinery, because it cannot monitor the oil circuit pressure.

[0005] In a first aspect, the present invention provides a method for determining pump pressure in a hydraulic system, the hydraulic system comprising: a plurality of auxiliary pumps, each auxiliary pump being correspondingly equipped with a pressure detection device for measuring the pressure of the auxiliary pump, the method comprising:

[0006] When the first pressure detection device corresponding to the target auxiliary pump is in a fault state, the output torque of the engine side connected to the hydraulic system and the first input torque corresponding to each of the other auxiliary pumps are obtained, wherein the target auxiliary pump is any one of the auxiliary pumps.

[0007] Based on the output torque and the first input torques corresponding to each of the other auxiliary pumps, calculate the second input torque corresponding to the target auxiliary pump;

[0008] Based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump, the current pump pressure of the target auxiliary pump is calculated.

[0009] When the pressure detection device installed on the target auxiliary pump malfunctions, this invention calculates the input torque of the target auxiliary pump by utilizing the output torque of the engine side, the power source of the hydraulic system, and the input torque of other auxiliary pumps in the hydraulic system. Then, it calculates the pump pressure of the target auxiliary pump by using the pump displacement and volumetric efficiency of the target auxiliary pump. This provides accurate pressure data for the stable operation of the hydraulic system, avoids safety risks, ensures the stable performance of the construction machinery, and helps to extend the service life of the entire construction machinery.

[0010] In one optional implementation, obtaining the output torque on the engine side connected to the hydraulic system includes:

[0011] Obtain the engine's maximum torque from the engine side;

[0012] The output torque is calculated based on the engine's maximum torque and the engine's torque percentage.

[0013] This invention can accurately calculate the engine-side output torque by utilizing the engine's maximum torque and torque percentage feedback. The engine-side output torque is the total input torque of the entire hydraulic system, thus providing an accurate data basis for subsequent calculation of the target auxiliary pump's input torque and ensuring the accuracy of the target auxiliary pump's input torque calculation.

[0014] In one optional implementation, calculating the second input torque corresponding to the target auxiliary pump based on the output torque and the first input torques corresponding to each of the other auxiliary pumps includes:

[0015] Calculate the sum of the first input torques corresponding to each of the other auxiliary pumps to obtain the third input torque;

[0016] The difference between the first input torque and the third input torque is calculated to obtain the second input torque.

[0017] This invention utilizes the sum of the input torques of all auxiliary pumps in the entire hydraulic system. By calculating the sum of the input torques of all auxiliary pumps except the target auxiliary pump and then subtracting it from the total input torque, the input torque of the target auxiliary pump can be accurately calculated, providing a precise data basis for subsequent calculation of the pump pressure of the target auxiliary pump.

[0018] In one alternative implementation, the current pump pressure of the target auxiliary pump is calculated based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump.

[0019] This invention utilizes the relationship between the input torque of the target auxiliary pump and the pump pressure, pump displacement, and volumetric efficiency to obtain the current pump pressure of the target auxiliary pump through mathematical calculation. This avoids the loss of pump pressure data in the event of a malfunction in the pressure detection device corresponding to the target auxiliary pump, providing an accurate pressure data basis for hydraulic system control and helping to maintain the stability of the entire hydraulic system operation.

[0020] In an optional implementation, the method further includes: if no pressure measurement data is received from the pressure detection device corresponding to the target auxiliary pump within a preset time period, determining that the pressure detection device corresponding to the target auxiliary pump is in a fault state.

[0021] This invention utilizes the characteristic of periodically collecting pressure data in a hydraulic system to determine that the pressure detection device is in a faulty state when no pressure measurement data is received within a preset time period. This triggers the calculation of the corresponding pressure data at the pressure detection device, thus avoiding the impact on the stability of the entire hydraulic system due to the lack of a single pressure measurement data.

[0022] In one alternative implementation, the method further includes controlling the hydraulic system based on the current pump pressure of the target auxiliary pump.

[0023] This invention controls the hydraulic system by utilizing the calculated current pump pressure of the target auxiliary pump, thereby achieving stable operation of the hydraulic system, avoiding unnecessary safety risks, and improving the stability and service life of the entire engineering machinery.

[0024] Secondly, the present invention provides a pump pressure determining device for a hydraulic system, the hydraulic system comprising: a plurality of auxiliary pumps, each auxiliary pump being correspondingly provided with a pressure detection device for measuring the pressure of the auxiliary pump, the device comprising:

[0025] The acquisition module is used to acquire the output torque of the engine side connected to the hydraulic system and the first input torque of each of the other auxiliary pumps when the first pressure detection device corresponding to the target auxiliary pump is in a fault state. The target auxiliary pump is any one of the auxiliary pumps.

[0026] The first processing module is used to calculate the second input torque corresponding to the target auxiliary pump based on the output torque and the first input torques corresponding to each of the other auxiliary pumps.

[0027] The second processing module is used to calculate the current pump pressure of the target auxiliary pump based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump.

[0028] Thirdly, the present invention provides an engineering machinery, comprising: a hydraulic system, the hydraulic system comprising: a plurality of auxiliary pumps, each auxiliary pump being correspondingly provided with a pressure detection device for measuring the pressure of the auxiliary pump; the engineering machinery further comprising: a controller, the controller comprising:

[0029] The system includes a memory and a processor, which are interconnected and communicate with each other. The memory stores computer instructions, and the processor executes these computer instructions to perform the pump pressure determination method of the hydraulic system described in the first aspect or any of its corresponding embodiments.

[0030] In one alternative implementation, the pressure detection device is a pressure sensor, and the construction machinery is an excavator.

[0031] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the pump pressure determination method of the hydraulic system described in the first aspect or any corresponding embodiment thereof. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic flowchart of a method for determining pump pressure in a hydraulic system according to an embodiment of the present invention;

[0034] Figure 2 This is a flowchart illustrating another method for determining pump pressure in a hydraulic system according to an embodiment of the present invention.

[0035] Figure 3 This is a flowchart illustrating another method for determining pump pressure in a hydraulic system according to an embodiment of the present invention.

[0036] Figure 4 This is a schematic diagram illustrating the specific workflow of determining the pump pressure of a hydraulic system according to an embodiment of the present invention.

[0037] Figure 5A This is an engine torque characteristic curve according to an embodiment of the present invention;

[0038] Figure 5B This is a graph showing the relationship between engine torque and engine speed according to an embodiment of the present invention;

[0039] Figure 5CThis is a schematic diagram of the torque percentage of an engine in operation according to an embodiment of the present invention;

[0040] Figure 6 This is a structural block diagram of a pump pressure determining device for a hydraulic system according to an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the hardware structure of the engineering machinery according to an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the hydraulic systems of construction machinery, pressure sensors have various applications, including detecting the hydraulic system pressure of hydraulic excavators, the hydraulic pump pressure of concrete mixer trucks, and the air pressure system of bulldozers. These sensors are crucial for ensuring the normal operation and safety of construction machinery. Construction machinery pressure sensors are very important devices, characterized by the following key features: First, they possess high accuracy and reliability, guaranteeing the normal operation and safety of the machinery. Furthermore, they have a long service life and low maintenance costs, extending the lifespan of the machinery.

[0044] Taking excavators as an example of construction machinery, pressure sensors on excavators are generally used to measure the oil pressure in the hydraulic system. These pressure sensors can be installed in the hydraulic tank, hydraulic pump, hydraulic cylinder, and other critical components. Once a pressure sensor malfunctions, it will affect the overall operating efficiency and control performance of the machinery, and may even affect the service life of the construction machinery.

[0045] Below are some aspects of the application of pressure sensors in excavators.

[0046] (1) In hydraulic pumps and hydraulic tanks: Pressure sensors can be installed in hydraulic pumps and hydraulic tanks to monitor the oil circuit pressure of the hydraulic system in real time and provide the operator with an accurate pressure value to ensure that the hydraulic system works within the design working pressure range, or to use power algorithms to limit the pump displacement to ensure that the power system of the whole machine does not exceed the engine's operating power, thus avoiding adverse results or dangers caused by over-power and over-torque, engine speed drop, and motor over-torque.

[0047] (2) In the operating system: Pressure sensors can also be used to detect the hydraulic pressure of various excavator operations, such as the boom, bucket, and travel. These sensors can help operators understand the equipment status and help to detect and resolve hydraulic system faults early.

[0048] (3) In the hydraulic cylinder: A pressure sensor is installed in the hydraulic cylinder to monitor the oil pressure and position of the hydraulic cylinder in real time and adjust the working state of the hydraulic system.

[0049] Taking pressure sensor failure in a hydraulic excavator as an example, existing conventional solutions include:

[0050] (1) The common practice in the excavator industry is to use the excavator's port alarm, or to judge the sensor based on real-time pressure data and then inform the operator or maintenance personnel through the display screen or other means.

[0051] (2) The excavator operator judges whether there is a problem with the excavator based on the excavator's operating performance, and then informs the service personnel to go to the site for troubleshooting;

[0052] (3) If there is a problem with the main pump pressure, a pressure setpoint of 200 bar will generally be given to the main pump;

[0053] Taking an excavator as an example, what happens if the main pump pressure sensor is damaged:

[0054] (1) If the power source is an engine, the lack of a pressure sensor for the main pump will have the following consequences:

[0055] Excessive torque can lead to black smoke from the engine, carbon buildup, and significant speed drops, impacting engine lifespan. Inability to control engine output torque can cause sudden increases in fuel consumption and abnormally slow operation, affecting work efficiency. The lack of hydraulic sensors affects the engine's ability to control speed drops and torque, ultimately degrading excavator performance and impacting operator experience. Even a 200 bar pressure applied to the main pump cannot guarantee that the hydraulic system will not exceed its usable torque.

[0056] (2) If the power source is an electric motor, it will also affect the torque control effect:

[0057] Excessive torque can cause the motor to overheat and easily damage it; it can also cause overcurrent in the entire electrical system, leading to overload of the wiring harness and other dangerous consequences.

[0058] The pump pressure determination scheme for hydraulic systems provided by this invention monitors the fault status of pressure sensors in real time. In the event of failure of the pressure sensor corresponding to any pump, a scientific calculation algorithm is used to estimate the real-time pressure of the sensor, intervene in the control loop, and optimize the pressure data related links of the whole system, thereby optimizing performance, avoiding risks, and displaying virtual pressure values ​​reasonably.

[0059] According to an embodiment of the present invention, a method for determining pump pressure in a hydraulic system is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0060] This embodiment provides a method for determining pump pressure in a hydraulic system, applicable to controllers of engineering machinery, such as microcontrollers and MCUs. Figure 1 This is a flowchart of a method for determining pump pressure in a hydraulic system according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps:

[0061] Step S101: When the first pressure detection device corresponding to the target auxiliary pump is in a fault state, the output torque of the engine side connected to the hydraulic system and the first input torque corresponding to each of the other auxiliary pumps are obtained. The target auxiliary pump is any one of the auxiliary pumps.

[0062] Specifically, for engineering machinery powered by an engine, the output torque on the engine side is the total input torque of the hydraulic system, which is the sum of the input torques of each auxiliary pump.

[0063] For example, taking a hydraulic excavator as an example of construction machinery, the auxiliary pumps of the excavator's hydraulic system include: a main pump, a pilot pump, a water-distribution pump, an oil-distribution pump, an air conditioning pump, etc. Taking the target auxiliary pump as the main pump as an example, the other auxiliary pumps are the pilot pump, the water-distribution pump, the oil-distribution pump, and the air conditioning pump. In addition, any other auxiliary pump can be used as the target auxiliary pump, and the present invention is not limited thereto.

[0064] Step S102: Based on the output torque and the first input torque corresponding to each of the other auxiliary pumps, calculate the second input torque corresponding to the target auxiliary pump.

[0065] Specifically, the difference between the engine's output torque and the sum of the input torques of other auxiliary pumps is the second input torque.

[0066] Step S103: Calculate the current pump pressure of the target auxiliary pump based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump.

[0067] Specifically, the conversion relationship between the input torque of the target auxiliary pump and the pump displacement, pump pressure, and volumetric efficiency is established. Therefore, given the input torque, pump displacement, and volumetric efficiency, the pump pressure can be calculated using this conversion relationship.

[0068] In this embodiment of the invention, after the pressure detection device installed on the target auxiliary pump fails, the input torque of the target auxiliary pump is calculated by using the output torque of the engine side of the hydraulic system's power source and the input torque of other auxiliary pumps in the hydraulic system. Then, the pump pressure of the target auxiliary pump is calculated by using the pump displacement and volumetric efficiency of the target auxiliary pump. This provides accurate pressure data for the stable operation of the hydraulic system, avoids safety risks, ensures the stable performance of the construction machinery, and helps to extend the service life of the entire construction machinery.

[0069] This embodiment provides a method for determining pump pressure in a hydraulic system, applicable to controllers of engineering machinery, such as microcontrollers and MCUs. Figure 2 This is a flowchart of a method for determining pump pressure in a hydraulic system according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps:

[0070] Step S201: When the first pressure detection device corresponding to the target auxiliary pump is detected to be in a fault state, the output torque of the engine side connected to the hydraulic system and the first input torque corresponding to each of the other auxiliary pumps are obtained. The target auxiliary pump is any one of the auxiliary pumps.

[0071] Specifically, obtaining the output torque on the engine side connected to the hydraulic system in step S201 above includes:

[0072] Step a1: Obtain the maximum engine torque on the engine side.

[0073] The maximum torque of the engine is a theoretical torque value determined by the engine model based on feedback from the engine side, and it is a fixed value.

[0074] Step a2: Calculate the output torque based on the engine's maximum torque and the engine's torque percentage.

[0075] Specifically, the engine torque percentage is the torque percentage fed back in real time from the engine side. The engine output torque can be calculated by multiplying the engine's maximum torque by the engine torque percentage.

[0076] This invention provides a precise calculation of the engine-side output torque by utilizing the engine's maximum torque and torque percentage feedback. The engine-side output torque is the total input torque of the entire hydraulic system, thus providing a precise data basis for the subsequent calculation of the target auxiliary pump's input torque and ensuring the accuracy of the target auxiliary pump's input torque calculation.

[0077] Step S202: Based on the output torque and the first input torque corresponding to each of the other auxiliary pumps, calculate the second input torque corresponding to the target auxiliary pump.

[0078] Specifically, step S202 includes:

[0079] Step S2021: Calculate the sum of the first input torques corresponding to each of the other auxiliary pumps to obtain the third input torque.

[0080] Specifically, since the pressure detection devices corresponding to the other auxiliary pumps are in normal working condition, the input torque of each other auxiliary pump can be calculated based on the pump displacement, volumetric efficiency, and pump pressure measured on each auxiliary pump.

[0081] Step S2022: Calculate the difference between the first input torque and the third input torque to obtain the second input torque.

[0082] This invention utilizes the sum of the input torques of all auxiliary pumps in the entire hydraulic system. By calculating the sum of the input torques of all auxiliary pumps except the target auxiliary pump and then subtracting it from the total input torque, the input torque of the target auxiliary pump can be accurately calculated, providing a precise data basis for subsequent calculation of the pump pressure of the target auxiliary pump.

[0083] Step S203: Calculate the current pump pressure of the target auxiliary pump based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump.

[0084] Specifically, step S203 above calculates the current pump pressure of the target auxiliary pump based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump.

[0085] For example, the current pump pressure of the target auxiliary pump is calculated using the following formula:

[0086] T = F * Q / (2π * VE)

[0087] Where T represents the second input torque, F represents the current pump pressure of the target auxiliary pump, Q represents the pump displacement of the target auxiliary pump, and VE represents the volumetric efficiency of the target auxiliary pump.

[0088] This invention utilizes the relationship between the input torque of the target auxiliary pump and the pump pressure, pump displacement, and volumetric efficiency to obtain the current pump pressure of the target auxiliary pump through mathematical calculation. This avoids the loss of pump pressure data in the event of a malfunction in the pressure detection device corresponding to the target auxiliary pump, providing an accurate pressure data basis for hydraulic system control and helping to maintain the stability of the entire hydraulic system operation.

[0089] This embodiment provides a method for determining pump pressure in a hydraulic system, applicable to controllers of engineering machinery, such as microcontrollers and MCUs. Figure 3 This is a flowchart of a method for determining pump pressure in a hydraulic system according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps:

[0090] Step S301: If no pressure measurement data is received from the pressure detection device corresponding to the target auxiliary pump within a preset time period, it is determined that the pressure detection device corresponding to the target auxiliary pump is in a fault state.

[0091] The preset time period is the data acquisition cycle of the pressure detection devices, such as pressure sensors, corresponding to each auxiliary pump, determined during the design and production phase of the engineering machinery. If no pressure data is received from the pressure sensor after the data acquisition cycle, the pressure sensor is considered to be faulty.

[0092] This invention utilizes the characteristic of periodically collecting pressure data in a hydraulic system to determine that the pressure detection device is in a faulty state when no pressure measurement data is received within a preset time period. This triggers the calculation of the corresponding pressure data at the pressure detection device, thus avoiding the impact on the stability of the entire hydraulic system due to the lack of a single pressure measurement data.

[0093] Step S302: When the first pressure detection device corresponding to the target auxiliary pump is detected to be in a fault state, the output torque of the engine side connected to the hydraulic system and the first input torque corresponding to each of the other auxiliary pumps are acquired. The target auxiliary pump is any one of the auxiliary pumps. See details below. Figure 2 The relevant descriptions of step S201 shown will not be repeated here.

[0094] Step S303: Based on the output torque and the first input torque corresponding to each of the other auxiliary pumps, calculate the second input torque corresponding to the target auxiliary pump. For details, please refer to... Figure 2 The relevant descriptions of step S202 shown will not be repeated here.

[0095] Step S304: Based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump, calculate the current pump pressure of the target auxiliary pump. See details below. Figure 2 The relevant description of step S203 shown will not be repeated here.

[0096] Step S305: Control the hydraulic system based on the current pump pressure of the target auxiliary pump.

[0097] Specifically, the current pump pressure of the target auxiliary pump can be incorporated into the control loop of the constant power algorithm and PID algorithm of the entire construction machinery, such as an excavator, to achieve operation control of the hydraulic system of the construction machinery.

[0098] This invention utilizes the calculated current pump pressure of the target auxiliary pump to control the hydraulic system, thereby achieving stable operation of the hydraulic system, avoiding unnecessary safety risks, and improving the stability and service life of the entire engineering machinery.

[0099] The following will describe in detail the specific implementation process of determining the pump pressure of the hydraulic system provided in the embodiments of the present invention, using specific practical examples.

[0100] Taking excavators as an example of construction machinery, such as Figure 4 As shown, during excavator operation, the controller port self-test is used to monitor the main pump pressure sensor port in real time, and it also monitors the pressure sensor ports of other pumps. For example... Figure 5A and Figure 5B As shown, there is a corresponding relationship between engine torque and engine speed. Engine torque percentage = (excavator's total operating torque / loss efficiency) / engine's maximum available torque. Figure 5C This represents the percentage of torque the engine delivers during operation. The main power components of an excavator include: main pump, pilot pump, oil cooler pump, water cooler pump, and air conditioning pump. Therefore:

[0101] Formula 1: Excavator total operating torque (N / M) = Main pump input torque (N / M) + Pilot pump input torque (N / M) + Oil and water pump input torque (N / M) + Air conditioning pump input torque (N / M);

[0102] After conversion, we can obtain Formula 2: Input torque of main pump (N / M) = Total torque of excavator (N / M) - (Input torque of pilot pump (N / M) + Input torque of oil and water pumps (N / M) + Input torque of air conditioning pump);

[0103] Formula 3: Excavator's total operating torque (N / M) = Engine torque percentage * Engine maximum torque;

[0104] Equation 4: Input torque of main pump (N / M) = (Main pump displacement * Main pump pressure) / 2 * π / Main pump volumetric efficiency;

[0105] If the pressure sensor of the main pump is damaged at this time, the virtual pressure value of the damaged pressure sensor can be calculated by Equations 2, 3, and 4. This virtual data can be used in the control loop of the constant power algorithm and PID algorithm of the whole machine to further ensure the safe operation of the excavator or display operating information and troubleshooting.

[0106] Similarly, besides the main pump pressure, if other pressure sensors malfunction, such as the coolant pump pressure sensor, this method can also be used to display virtual pressure. For example, Equation 5: Coolant pump pressure = (Engine torque percentage * Engine maximum torque - Main pump torque) * 2 * π / Coolant pump displacement.

[0107] The embodiments of the present invention can ensure the excavator's performance stability even if the main pump sensor is damaged; can display the approximate pump pressure information of the main pump; maintain the stable operation of the power system; avoid unnecessary risks caused by over-torque in the power system; in addition to the main pump, this solution can also be applied to the pressure prediction of the cooling pump.

[0108] This embodiment also provides a pump pressure determining device for a hydraulic system, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0109] This embodiment provides a pump pressure determination device for a hydraulic system, such as... Figure 6 As shown, it includes:

[0110] The acquisition module 601 is used to acquire the output torque of the engine side connected to the hydraulic system and the first input torque of each of the other auxiliary pumps when the first pressure detection device corresponding to the target auxiliary pump is in a fault state. The target auxiliary pump is any one of the auxiliary pumps.

[0111] The first processing module 602 is used to calculate the second input torque corresponding to the target auxiliary pump based on the output torque and the first input torques corresponding to each of the other auxiliary pumps.

[0112] The second processing module 603 is used to calculate the current pump pressure of the target auxiliary pump based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump.

[0113] In some alternative implementations, the acquisition module 601 includes:

[0114] The first acquisition unit is used to acquire the maximum torque of the engine on the engine side;

[0115] The first processing unit is used to calculate the output torque based on the engine's maximum torque and the engine's torque percentage.

[0116] In some alternative implementations, the first processing module 602 includes:

[0117] The first calculation unit is used to calculate the sum of the first input torques corresponding to each of the other auxiliary pumps to obtain the third input torque;

[0118] The second calculation unit is used to calculate the difference between the first input torque and the third input torque to obtain the second input torque.

[0119] In some alternative implementations, the second processing module 603 includes:

[0120] The third calculation unit is used to calculate the current pump pressure of the target auxiliary pump based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump.

[0121] In some alternative embodiments, the above-described apparatus further includes:

[0122] The third processing module is used to determine that the pressure detection device corresponding to the target auxiliary pump is in a fault state when no pressure measurement data is received from the pressure detection device corresponding to the target auxiliary pump within a preset time period.

[0123] In some alternative embodiments, the above-described apparatus further includes:

[0124] The fourth processing module is used to control the hydraulic system based on the current pump pressure of the target auxiliary pump.

[0125] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0126] In this embodiment, the pump pressure determination device of the hydraulic system is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0127] This invention also provides an engineering machinery, including: a hydraulic system, the hydraulic system including: a plurality of auxiliary pumps, each auxiliary pump being correspondingly equipped with a pressure detection device for measuring the pressure of the auxiliary pump; in addition, the engineering machinery also has the above-mentioned features. Figure 6 The device shown is for determining the pump pressure of the hydraulic system.

[0128] In some alternative implementations, the aforementioned construction machinery is an excavator, and the aforementioned pressure detection device is a pressure sensor. Taking an excavator as an example, auxiliary pumps include, but are not limited to: main pump, pilot pump, water pump, oil pump, air conditioning pump, etc.

[0129] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of a controller for engineering machinery provided in an optional embodiment of the present invention, as shown below. Figure 7 As shown, the controller includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions that execute within the computer device, including instructions stored in or on memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 7 Take a processor 10 as an example.

[0130] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0131] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0132] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0133] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0134] The controller also includes an input device 30 and an output device 40. The processor 10, memory 20, input device 30, and output device 40 can be connected via a bus or other means. Figure 7 Taking the example of a connection between China and Israel via a bus.

[0135] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0136] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method of pump pressure determination for a hydraulic system, the hydraulic system comprising: A plurality of auxiliary pumps, each equipped with a pressure detection device for measuring the pressure of the auxiliary pump, characterized in that the method comprises: When the first pressure detection device corresponding to the target auxiliary pump is in a fault state, the output torque of the engine side connected to the hydraulic system and the first input torque corresponding to each of the other auxiliary pumps are obtained, wherein the target auxiliary pump is any one of the auxiliary pumps. Based on the output torque and the first input torques corresponding to each of the other auxiliary pumps, calculate the second input torque corresponding to the target auxiliary pump; Based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump, calculate the current pump pressure of the target auxiliary pump; The output torque on the engine side is the total input torque of the hydraulic system, and the total input torque is equal to the sum of the input torques of each auxiliary pump; obtaining the output torque on the engine side connected to the hydraulic system includes: Obtain the engine's maximum torque from the engine side; The output torque is calculated based on the engine's maximum torque and the engine's torque percentage; The calculation of the second input torque corresponding to the target auxiliary pump based on the output torque and the first input torques corresponding to each of the other auxiliary pumps includes: Calculate the sum of the first input torques corresponding to each of the other auxiliary pumps to obtain the third input torque; The difference between the first input torque and the third input torque is calculated to obtain the second input torque.

2. The method of claim 1, wherein, The method further includes: If no pressure measurement data is received from the pressure detection device corresponding to the target auxiliary pump within a preset time period, it is determined that the pressure detection device corresponding to the target auxiliary pump is in a fault state.

3. The method of claim 2, wherein, The method further includes: The hydraulic system is controlled based on the current pump pressure of the target auxiliary pump.

4. A pump pressure determination device for a hydraulic system, the hydraulic system comprising: A plurality of auxiliary pumps, each auxiliary pump being equipped with a pressure detection device for measuring the pressure of the auxiliary pump, characterized in that the device comprises: The acquisition module is used to acquire the output torque of the engine side connected to the hydraulic system and the first input torque of each of the other auxiliary pumps when the first pressure detection device corresponding to the target auxiliary pump is in a fault state. The target auxiliary pump is any one of the auxiliary pumps. The output torque of the engine side is the total input torque of the hydraulic system, and the total input torque is equal to the sum of the input torques of each auxiliary pump. Acquiring the output torque of the engine side connected to the hydraulic system includes: acquiring the maximum torque of the engine; and calculating the output torque based on the maximum torque of the engine and the torque percentage of the engine. The first processing module is used to calculate the second input torque corresponding to the target auxiliary pump based on the output torque and the first input torques corresponding to each of the other auxiliary pumps; the calculation of the second input torque corresponding to the target auxiliary pump based on the output torque and the first input torques corresponding to each of the other auxiliary pumps includes: calculating the sum of the first input torques corresponding to each of the other auxiliary pumps to obtain a third input torque; calculating the difference between the first input torque and the third input torque to obtain the second input torque; The second processing module is used to calculate the current pump pressure of the target auxiliary pump based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump.

5. A working machine, characterized in that include: The hydraulic system includes: a plurality of auxiliary pumps, each auxiliary pump being equipped with a pressure detection device for measuring the pressure of the auxiliary pump; the engineering machinery further includes: a controller, the controller comprising: A memory and a processor are communicatively connected, the memory storing computer instructions, and the processor executing the computer instructions to perform the pump pressure determination method of any one of claims 1 to 3.

6. The engineering machinery according to claim 5, characterized in that, The pressure detection device is a pressure sensor, and the construction machinery is an excavator.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the pump pressure determination method of the hydraulic system according to any one of claims 1 to 3.

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