CN116892504A - Control method and system of electric control pump, operation machine and electronic equipment - Google Patents

Control method and system of electric control pump, operation machine and electronic equipment Download PDF

Info

Publication number
CN116892504A
CN116892504A CN202311069348.1A CN202311069348A CN116892504A CN 116892504 A CN116892504 A CN 116892504A CN 202311069348 A CN202311069348 A CN 202311069348A CN 116892504 A CN116892504 A CN 116892504A
Authority
CN
China
Prior art keywords
engine
load
pump
power
sensitive variable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311069348.1A
Other languages
Chinese (zh)
Inventor
秦磊
孙国印
黄海楠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sany Heavy Machinery Ltd
Original Assignee
Sany Heavy Machinery Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sany Heavy Machinery Ltd filed Critical Sany Heavy Machinery Ltd
Priority to CN202311069348.1A priority Critical patent/CN116892504A/en
Publication of CN116892504A publication Critical patent/CN116892504A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The application provides a control method and a control system of an electric control pump, the electric control pump, an operation machine and electronic equipment, belonging to the technical field of hydraulic operation machines, wherein the control method is applied to a load-sensitive hydraulic system driven by an engine and comprises the following steps: determining a current value for matching the power required by a load sensitive variable pump of a load sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relation between the gear of the engine and the power required by the pump and the control current; and adjusting the control current of the load sensitive variable pump based on the current value. The application is used for realizing the coexistence of the power electric control adjustment of the load-sensitive variable pump and the load-sensitive self-adaptive displacement adjustment, thereby further eliminating the power deviation between the engine and the pump and maximally and effectively utilizing the power of the engine.

Description

Control method and system of electric control pump, operation machine and electronic equipment
Technical Field
The application relates to the technical field of hydraulic working machines, in particular to a control method and system of an electric control pump, the electric control pump, a working machine and electronic equipment.
Background
The hydraulic pump is used as a power source of the hydraulic working machine, the whole performance of the working machine is directly influenced, the element driving the hydraulic pump is an engine, the matching between the engine and the hydraulic pump is required to be reasonable in order to ensure the whole performance of the working machine, and the matching between the hydraulic pump and the engine is carried out by adopting an electric control method, so that the flexibility of power matching can be greatly improved.
The load sensitive variable pump is used for converting the flow demand of the load sensitive hydraulic system into the regulation of the pump displacement, and the load sensitive variable pump provides the flow according to the flow demand of the load sensitive hydraulic system, so that the energy waste caused by the redundant flow is avoided. At the same time, the maximum power limit of the load sensitive variable pump cannot exceed the rated power output of the engine, otherwise shutdown faults caused by insufficient engine capacity are easily caused. Thus, a reasonable match of pump maximum power to engine rated power should be achieved.
At present, for the power matching of the pump, the general matching principle is that the maximum power limit value of the pump is less than or equal to the rated power output (including reserve power) of the engine, but in practice, a larger or smaller difference value exists between the maximum power limit value of the pump and the rated power output of the engine all the time, and the difference value causes a certain energy waste. Thus, if the difference between the maximum power limit of the pump and the rated power output of the engine can be further reduced, even if the maximum power limit of the pump is as close as possible to the rated power output of the engine, the overall energy efficiency will be further improved.
Disclosure of Invention
The application provides a control method and a control system of an electric control pump, the electric control pump, an operation machine and electronic equipment, which are used for solving the defect of lower energy efficiency of the whole machine caused by larger difference between the maximum power limit value of the pump and the rated power output of an engine based on the current control method of the electric control pump.
The application provides a control method of an electric control pump, which is applied to a load sensitive hydraulic system driven by an engine and comprises the following steps:
determining a current value for matching the power required by a load sensitive variable pump of the load sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relation between the gear of the engine and the power required by the pump and the control current;
and adjusting the control current of the load sensitive variable pump based on the current value.
According to the control method of the electric control pump of the present application, the determining a current value for matching the power required by the load sensitive variable pump of the load sensitive hydraulic system with the actual output power based on the real-time gear of the engine and the preset matching relation between the engine gear and the power required by the pump and the control current includes:
acquiring the real-time gear of the engine;
determining a real-time rotational speed of the engine based on the real-time gear;
determining the actual output power of the engine based on the real-time rotational speed and an engine characteristic of the engine;
and determining the current value based on the preset matching relation.
According to the control method of the electric control pump of the present application, the determining the actual output power of the engine based on the real-time rotation speed and an engine characteristic curve of the engine includes:
determining a theoretical output power of the engine based on the real-time rotational speed and the engine characteristic;
and subtracting the theoretical output power from the power reserve value of the engine to obtain the actual output power of the engine.
According to the control method of the electric control pump, the preset matching relation is determined, and the method comprises the following steps:
respectively acquiring a first parameter corresponding relation and a second parameter corresponding relation of the load-sensitive variable pump, wherein the first parameter corresponding relation is the corresponding relation of the pressure, the flow, the power and the torque of the load-sensitive variable pump at a preset rotating speed, and the second parameter corresponding relation is the corresponding relation of the pressure, the flow, the power and the torque of the load-sensitive variable pump at a preset control current; the preset rotating speed and the engine gear have a one-to-one correspondence;
and determining the preset matching relation between the engine gear and the power required by the pump and the control current based on the first parameter corresponding relation and the second parameter corresponding relation.
According to the control method of the electric control pump of the present application, before adjusting the control current of the load sensitive variable pump, the method further comprises:
acquiring the torque of the load-sensitive variable pump and the torque of the engine;
and when the torque of the load-sensitive variable pump is not matched with the torque of the engine, adjusting the control current until the torque of the load-sensitive variable pump is matched with the torque of the engine.
The application also provides a control system of an electric control pump, which is applied to a load sensitive hydraulic system driven by an engine and comprises:
the current determining module is used for determining a current value for matching the power required by the load-sensitive variable pump of the load-sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relation between the gear of the engine and the power required by the pump and the control current;
and the current adjusting module is used for adjusting the control current of the load sensitive variable pump based on the current value.
The application also provides an electric control pump which is a load sensitive variable pump and is controlled by adopting the control method of the electric control pump or the control system of the electric control pump.
The application also provides a working machine comprising an electrically controlled pump as described above.
According to the working machine of the application, the working modes of the working machine comprise a plurality of working modes, and at least one engine gear is planned in each working mode.
The application also 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 realizes the control method of the electric control pump when executing the program.
The control method is applied to a load sensitive hydraulic system driven by an engine, and a current value for matching the power required by a load sensitive variable pump of the load sensitive hydraulic system with actual output power is determined through a preset matching relation based on real-time gear of the engine, power required by the engine gear and the pump and control current; and adjusts the control current of the load sensitive variable pump based on the current value. Meanwhile, the load sensitive variable pump can adaptively adjust the displacement based on the pressure difference of the load sensitive interval so as to meet the flow requirement of a load sensitive hydraulic system, so that the power electric control adjustment of the load sensitive variable pump and the load sensitive adaptive displacement adjustment coexist, the power required by the load sensitive variable pump and the actual output power of each gear of the engine can be optimally matched, and the energy efficiency of the whole machine is effectively improved.
The method comprises the steps of obtaining a first parameter corresponding relation among pressure, flow, power and torque of a load sensitive variable pump at a preset rotating speed and a second parameter corresponding relation among pressure, flow, power and torque of the load sensitive variable pump at a preset control current, determining a preset matching relation between the power required by an engine gear and the pump and the control current based on the first parameter corresponding relation and the second parameter corresponding relation, and realizing the power matching control of the load sensitive variable pump and the engine based on the PQT characteristic of the load sensitive variable pump.
Drawings
In order to more clearly illustrate the application or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a control method of an electric control pump according to an embodiment of the present application;
fig. 2 is a schematic diagram of a control method of an electronically controlled pump according to an embodiment of the present application;
FIG. 3 is a theoretical diagram of the operating region of a load-sensitive variable pump;
FIG. 4 is a graph of speed (gear) control for a load-sensitive variable displacement pump provided by an embodiment of the present application;
FIG. 5 is a control current control curve for providing a load sensitive variable pump according to an embodiment of the present application;
fig. 6 is a graph showing the theoretical characteristics of PQT of the load-sensitive variable pump provided by the embodiment of the present application at different currents and different rotational speeds (gears);
FIG. 7 is a flow chart of an implementation of the control of a load sensitive variable pump of an excavator provided by an embodiment of the present application;
fig. 8 is a schematic structural diagram of a control system of an electric control pump according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an electronic device provided by the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It can be understood that taking the excavator as an example, the electric control of the excavator is an important current development direction, and the electric control excavator has better development space in terms of reducing oil consumption and increasing efficiency. The requirements of users on the excavator are mainly reflected in lower use cost, more comfortable operability, higher construction efficiency and the like. Meanwhile, the electronic control has greater flexibility in meeting the personalized demands of customers, for example: the software program or algorithm can be upgraded to make a great technical improvement.
The hydraulic pump is used as a power source of the excavator, and the overall performance of the excavator is directly affected. And the matching of the pump and the engine is performed by adopting an electric control method, so that the overall performance of the excavator can be further improved. The electrical parameters of the electrical control pump are generally as follows: an electronically controlled displacement and an electronically controlled power. The electric control displacement is more advantageous in the excavator with the positive flow hydraulic system, the flow requirements of all oil ways on the main valve are judged through the pilot signal, the displacement of the electric control pump is further adjusted to meet the flow requirements of the hydraulic system, and the whole system responds faster. However, for the load sensitive hydraulic system, the parameter for determining the pump displacement is the pressure difference of the load sensitive section, and the electric control of the pump displacement can be realized by converting the pressure difference value into the electric signal, but the electric control has obvious defects, namely, the pressure difference of the load sensitive section is far ahead of the electric signal because the electric signal is subjected to filtering conversion treatment, so that the response hysteresis of the electric control pump displacement of the load sensitive system is obvious and the operability is poor.
In addition, the hydraulic pump can be better matched with the engine through electric control power, but the excavator has various use conditions, the rotating speed gear of the engine is more, and the pump is required to be matched within the optimal power limit value on different rotating speed gears of the engine so as to maximize the performance of the whole machine.
Therefore, the application provides a control method of the electric control pump with the coexistence of load-sensitive self-adaptive displacement adjustment and electric control power, so as to improve the matching degree of the load-sensitive variable pump and the engine.
The control method of the electric control pump provided by the application can be executed by the controller of the working machine.
The control method, system, electric control pump, working machine and electronic device of the present application are described below with reference to fig. 1 to 9.
The embodiment provides a control method of an electric control pump, which is applied to a load sensitive hydraulic system driven by an engine, as shown in fig. 1, and at least comprises the following steps:
101. and determining a current value for matching the power required by the load-sensitive variable pump with the actual output power based on the real-time gear of the engine and a preset matching relation between the gear of the engine and the power required by the pump and the control current.
102. Based on the current value, the control current of a load sensitive variable pump of the load sensitive hydraulic system is adjusted.
It will be appreciated that taking an excavator as an example, a plurality of working gears are generally provided, and the maximum power of the engine is also different under different working gears, so that the working under different working conditions can be adapted by adjusting the working gears of the excavator. It is known that the engine power corresponds to the gear rotating speed one by one, and in a reasonable engine characteristic working interval, the higher the gear rotating speed is, the larger the rated power is, meanwhile, the oil consumption is related to the gear rotating speed, so that the maximum power limit value of the pump is changed along with the gear of the engine, and the matching of the pump and the engine can be more reasonably realized, so that the energy conservation and the efficiency improvement are further realized.
Further, the higher the matching of the actual output power of the engine to the power demanded by the load sensitive variable displacement pump, the better the performance of the driveline. Meanwhile, in practical application, the control current of the load sensitive variable pump is controlled by the electromagnetic proportional valve, so that the adjustment of the power required by the load sensitive variable pump is realized, namely, the power required by the load sensitive variable pump is enabled to be adapted to the actual output power of the engine by adjusting the control current.
In the above embodiment, the power required by the pump in the preset matching relationship is the input power of the load-sensitive variable pump, that is, the power required by the load-sensitive variable pump, and the control current is the current of the load-sensitive variable pump controlled by the electromagnetic proportional valve. After a preset matching relation between the gear of the engine and the power required by the pump and the control current is established, a corresponding control current value can be determined from the preset matching relation based on the real-time gear of the engine, and further the power required by the load sensitive variable pump can be matched with the actual output power of the engine by adjusting the control current of the load sensitive variable pump. Meanwhile, when the control current changes the power required by the load sensitive variable pump, the input torque requirement of the load sensitive variable pump is changed, so that the power and torque selectable range of the load sensitive variable pump and the engine in optimal matching is wider.
In a specific embodiment, a PQT (pressure, flow, torque) characteristic diagram of the load-sensitive variable pump may be determined through a limited number of experimental tests, then an infinite number of theoretical PQT characteristic diagrams may be obtained by combining a theoretical fitting method, and finally the power required by the load-sensitive variable pump may be correlated with the engine gear based on the theoretical PQT characteristic diagrams.
Furthermore, the load sensitive function and the power variable function of the pump can effectively reduce energy waste, and if the load sensitive function and the power variable function can be used in a hydraulic system at the same time and optimally matched with the engine, the energy efficiency of the whole machine can be further improved.
It will be appreciated that for a load sensitive hydraulic system, the parameter determining pump displacement is the pressure differential across the load sensitive zone.
In this embodiment, the control method of the electric control pump is applied to the load-sensitive hydraulic system driven by the engine, and the load-sensitive variable pump of the load-sensitive hydraulic system can adaptively adjust the displacement based on the pressure difference of the load-sensitive interval so as to meet the flow demand of the load-sensitive hydraulic system, that is, the controller can adaptively adjust the displacement of the load-sensitive variable pump based on the pressure difference after acquiring the pressure difference of the load-sensitive interval, so that the displacement of the load-sensitive variable pump meets the flow demand of the hydraulic system.
In this embodiment, when the load sensitive variable pump is operating at maximum power, i.e., in a constant power state, the pump displacement may be automatically adjusted at constant power. Thus, the matching relationship between the engine and the pump can be established through the constant power function of the load sensitive variable pump.
The embodiment provides a control method of an electric control pump applied to a load sensitive hydraulic system driven by an engine, wherein the control current of a load sensitive variable pump is adjusted based on a preset matching relation between a real-time gear of the engine and power and control current required by the engine gear and the pump, so that the power required by the load sensitive variable pump is matched with the actual output power of the engine, and meanwhile, the load sensitive variable pump can adaptively adjust the displacement based on the pressure difference of a load sensitive zone so as to meet the flow requirement of the load sensitive hydraulic system. The dual control of the load sensitive variable pump based on the load sensitive self-adaptive displacement adjustment and the electric control power is realized, and the power required by the load sensitive variable pump can be optimally matched with the actual output power of each gear of the engine, so that the energy efficiency of the whole engine is improved.
Fig. 2 shows a schematic diagram of a control method of an electric control pump according to the above embodiment of the present application, and as can be seen from fig. 2, a control circuit 1 is used for adjusting a displacement requirement of a load-sensitive variable pump, and a control circuit 2 is used for controlling power required by the load-sensitive variable pump through an electromagnetic proportional valve, so as to adjust a power matching relationship between the load-sensitive variable pump and an engine, and the two control circuits are simultaneously present and do not conflict with each other, and a control result of the electric control pump is a comprehensive result of the two control circuits. Therefore, there is no sequence of controlling the electric control pump based on the control line 1 and the control line 2, and similarly, the steps 101 and 102 of the control method of the electric control pump according to the above embodiment of the present application are not limited to the control sequence of the electric control pump, but are two control modes, and thus, the contents of the steps 101 and 102 are exchangeable.
Based on the foregoing embodiment, determining a current value that matches the power demanded by the load-sensitive variable displacement pump of the load-sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relationship between the engine gear and the power demanded by the pump and the control current, includes:
acquiring a real-time gear of an engine;
determining a real-time rotational speed of the engine based on the real-time gear;
determining an actual output power of the engine based on the real-time rotational speed and an engine characteristic curve of the engine;
and determining a current value based on a preset matching relation.
In this embodiment, the corresponding relationship between the engine gear and the engine speed is preset, and the real-time speed of the engine can be determined based on the corresponding relationship between the engine gear and the engine speed by acquiring the real-time gear of the engine, and the engine characteristic curve characterizes the relationship among the engine speed, the output power, the torque and the like, so that after the real-time speed of the engine is determined, the actual output power of the engine can be further determined based on the engine characteristic curve of the engine.
It will be appreciated that the best match of the engine to the load sensitive variable pump is: the actual output power of the engine is equal to the power demanded by the load-sensitive variable displacement pump. Therefore, in this embodiment, when the actual output power of the engine in the current gear is determined, the actual output power of the engine may be used as the target value of the power required by the load-sensitive variable pump, so as to find a current value corresponding to the target value of the power in a preset matching relationship, where the current value is a current value that can match the power required by the load-sensitive variable pump with the actual output power, so that the control current of the load-sensitive variable pump is adjusted based on the current value, and when no influence factors such as detection errors are considered, the power required by the load-sensitive variable pump is equal to the actual output power of the engine, even if the power of the engine matches the power of the load-sensitive variable pump.
Based on the content of the above embodiment, determining the actual output power of the engine based on the rotational speed and the engine characteristic curve of the engine includes:
determining a theoretical output power of the engine based on the real-time rotational speed and the engine characteristic curve;
and subtracting the power reserve value of the engine from the theoretical output power to obtain the actual output power of the engine.
It will be appreciated that in order to ensure proper operation of the work machine, a power reserve value may be set for the engine for power consumption by air conditioning, cooler fans, altitude conditions, efficiency losses, etc.
In this embodiment, after determining the theoretical output power of the engine based on the real-time rotation speed of the engine and the engine characteristic curve, the power value obtained by subtracting the power reserve value of the engine from the theoretical output power is used as the actual output power of the engine, so that it is ensured that the power value used for determining the power required by the load-sensitive variable pump is the power actually output to the load-sensitive variable pump by the engine, and further the power matching degree between the load-sensitive variable pump and the engine after adjustment is improved.
Based on the content of the above embodiment, determining the preset matching relationship includes:
respectively acquiring a first parameter corresponding relation and a second parameter corresponding relation of the load-sensitive variable pump, wherein the first parameter corresponding relation is the corresponding relation of the pressure, the flow, the power and the torque of the load-sensitive variable pump at a preset rotating speed, and the second parameter corresponding relation is the corresponding relation of the pressure, the flow, the power and the torque of the load-sensitive variable pump at a preset control current; the preset rotating speed and the engine gear have a one-to-one correspondence;
and determining a preset matching relation between the engine gear and the power and control current required by the pump based on the first parameter corresponding relation and the second parameter corresponding relation.
In this embodiment, the power required by the pump is matched with the engine gear based on the theoretical PQT characteristic of the load-sensitive variable pump, and it is understood that the engine gear and the rotation speed are in a one-to-one correspondence relationship, so that it may be explained that the power required by the pump is matched with the rotation speed of the engine based on the theoretical PQT characteristic of the load-sensitive variable pump.
The specific implementation process is as follows: fig. 3 is a theoretical diagram of an operating region of the load-sensitive variable pump, and as can be seen from fig. 3, the operating region of the load-sensitive variable pump is divided into a constant flow region, a constant power or constant torque region, and a pressure cut-off region. The constant power area and the constant torque area are coincident areas under the same rotation speed, and mutual conversion can be realized through algebraic calculation. Meanwhile, the working interval of the load sensitive variable pump shows the relation among flow, power, pressure and torque. Therefore, based on the working interval of the load-sensitive variable pump, through experimental tests, a first parameter corresponding relationship, that is, a corresponding relationship of pressure, flow, power and torque of the load-sensitive variable pump at preset rotation speeds (rotation speed 1, rotation speed 2, rotation speed 3 and the like) as shown in fig. 4, may be obtained, and the corresponding relationship curve may also be referred to as a rotation speed (gear) control curve of the load-sensitive variable pump. It is known that the constant power curve of the PQT characteristic diagram already considers the efficiency of the pump, and the input constant torque is the same parameter as the output torque of the engine, so the pump and the engine need to be matched according to the constant torque value of the pump, and as is known from fig. 4, the torque is not changed when the rotation speed or gear of the engine is changed, but the smaller the rotation speed of the engine is, the smaller the constant power value of the pump is.
Similarly, based on the working interval of the load sensitive variable pump, the second parameter corresponding relation can be obtained through experimental test, that is, as shown in fig. 5, when the control current (current I 1 、I 2 And I 3 Etc.), the corresponding relationship of the pressure, the flow, the power and the torque of the load-sensitive variable pump may also be referred to as a control current control curve of the load-sensitive variable pump, and as can be seen from fig. 5, the smaller the control current, the larger the constant power value and the larger the constant torque value.
It will be appreciated that the theoretical characteristics of the load-sensitive variable pump and its control current relationship shown in fig. 5 correspond to the control mechanism being a load-sensitive variable pump with a larger control current and a smaller power demand, and thus, the conclusion from fig. 5 is that the smaller the control current, the larger the constant power value and the larger the constant torque value. When the control mechanism of the load sensitive variable pump is that the larger the control current is, the larger the power required is, the opposite characteristic diagram to that shown in fig. 5 can be obtained, namely, the smaller the control current is, the smaller the constant power value is and the smaller the constant torque value is.
Further, after the corresponding relation between the first parameter and the corresponding relation between the second parameter are determined, the preset matching relation between the engine gear and the power required by the pump and the control current shown in fig. 6 can be determined, namely, the PQT theoretical characteristics of the load sensitive variable pump under different currents and different rotating speeds (gears) are set up into a unified comprehensive graph for pressure, flow, input torque, current and rotating speed, and the change rule, trend and influencing factors of the torque, power of the load sensitive variable pump are displayed. As can be seen from fig. 6, by changing the rotational speed (gear) and the current, an infinite number of constant torque and constant power regions can be obtained. Meanwhile, a constant torque and constant power interval of the load sensitive variable pump in the limit capacity range can be obtained, so that when the capacity (corresponding gear) of the engine is enough, the corresponding constant torque and constant power matching between the load sensitive variable pump and the engine can be carried out.
In a specific embodiment, taking an excavator as an example, as shown in fig. 7, on one hand, the working mode of the excavator may be first divided into a high power mode (high fuel consumption), an economic mode (medium fuel consumption), a low power mode (low fuel consumption), and the like; then, planning a plurality of engine gears (the gear number is more than or equal to 0) in each working mode, wherein each gear corresponds to one engine rotating speed, and the gear planning is carried out according to an engine characteristic diagram comprising the relation among the rotating speed, the power, the oil consumption and the torque of the engine, so that the engine power and the torque equivalence of each gear are determined; second, by subtracting the determined engine power from the engine power reserve value, such as air conditioning, cooler fans, applicable to altitude conditions, efficiency losses, anti-stall reserves, etc., typically totaling no more than 30% of the total power of the engine; and finally, obtaining the power which can be supplied to the load sensitive variable pump by the engine under each gear, and calculating a torque value according to the rotating speed value corresponding to the gear. On the other hand, by detecting the real-time gear of the engine, and then according to a preset matching relation, namely a PQT characteristic diagram shown in fig. 6, the power and torque required by the load sensitive variable pump in the current gear can be determined, and by enabling the power or torque required by the pump to be equal to the power or torque which can be supplied to the pump by the engine in the current gear, the power matching of the engine and the load sensitive variable pump is realized.
Based on the foregoing embodiment, before adjusting the control current of the load-sensitive variable pump, the method further includes:
acquiring the torque of a load sensitive variable pump and the torque of an engine;
and when the torque of the load sensitive variable pump is not matched with the torque of the engine, adjusting the control current until the torque of the load sensitive variable pump is matched with the torque of the engine.
It can be understood that the precondition that the load-sensitive variable pump is reasonably matched with the engine is that the torque of the load-sensitive variable pump and the engine are matched, and the torque value of the engine is always not lower than the constant torque value of the load-sensitive variable pump. The constant torque value of the load sensitive variable pump is compared with the torque value corresponding to the engine, and the matching degree is better when the constant torque value and the torque value are close.
Based on this, in this embodiment, before adjusting the control current of the load-sensitive variable pump, the torque of the load-sensitive variable pump and the torque of the engine are obtained first to determine whether the torque of the load-sensitive variable pump is matched with the torque of the engine, where the determining of whether to match is performed by setting a difference threshold, that is, when the difference between the torque of the load-sensitive variable pump and the torque of the engine is greater than the difference threshold, it is determined that the torque of the load-sensitive variable pump is not matched with the torque of the engine, and when the difference between the torque of the load-sensitive variable pump and the torque of the engine is less than or equal to the difference threshold, it is determined that the torque of the load-sensitive variable pump is matched with the torque of the engine.
Further, when it is determined that the torque of the load-sensitive variable pump does not match the torque of the engine, the torque of the load-sensitive variable pump is adjusted by adjusting the control current of the load-sensitive variable pump.
Further, after the torque of the load-sensitive variable pump is determined to be matched with the torque of the engine, the power required by the load-sensitive variable pump, namely the actual output power of the engine, can be obtained through the product of the torque and the rotating speed. In addition, the constant power of the load sensitive variable pump can be configured in a high-power mode, an economic mode, a low-power mode and the like so as to realize the configuration of different oil consumption working modes.
Based on the same general inventive concept, the application also protects a control system of the electric control pump, and the control system of the electric control pump provided by the application is described below, and the control system of the electric control pump described below and the control method of the electric control pump described above can be referred to correspondingly.
Fig. 8 is a schematic structural diagram of a control system of an electronically controlled pump according to the present application. The system is applied to a load sensitive hydraulic system driven by an engine, as shown in fig. 8, the control system comprising: a current determination module 810 and a current adjustment module 820; wherein, the liquid crystal display device comprises a liquid crystal display device,
the current determining module 810 is configured to determine a current value that matches the power required by the load-sensitive variable pump of the load-sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relationship between the gear of the engine and the power required by the pump and the control current;
the current adjustment module 820 is used to adjust the control current of the load sensitive variable pump based on the current value.
According to the control system of the electric control pump, provided by the embodiment of the application, the control current of the load-sensitive variable pump is adjusted based on the real-time gear of the engine and the preset matching relation between the gear of the engine and the power and control current required by the pump, so that the power required by the load-sensitive variable pump is matched with the actual output power of the engine, and meanwhile, the load-sensitive variable pump of the load-sensitive hydraulic system can also adaptively adjust the displacement based on the pressure difference of a load-sensitive interval so as to meet the flow requirement of the load-sensitive hydraulic system. The dual control of the load sensitive variable pump based on the load sensitive self-adaptive displacement adjustment and the electric control power is realized, and the power required by the load sensitive variable pump can be optimally matched with the actual output power of each gear of the engine, so that the energy efficiency of the whole engine is improved.
Optionally, the current determination module 810 is specifically configured to:
acquiring a real-time gear of an engine;
determining a real-time rotational speed of the engine based on the real-time gear;
determining an actual output power of the engine based on the real-time rotational speed and an engine characteristic curve of the engine;
and determining a current value based on a preset matching relation.
Optionally, the current determination module 810 is more specifically configured to:
determining a theoretical output power of the engine based on the real-time rotational speed and the engine characteristic curve;
and subtracting the power reserve value of the engine from the theoretical output power to obtain the actual output power of the engine.
Optionally, the control system of the electronically controlled pump further comprises: a relationship determination module;
the relation determining module is used for respectively obtaining a first parameter corresponding relation and a second parameter corresponding relation of the load-sensitive variable pump, wherein the first parameter corresponding relation is the corresponding relation of the pressure, the flow, the power and the torque of the load-sensitive variable pump at a preset rotating speed, and the second parameter corresponding relation is the corresponding relation of the pressure, the flow, the power and the torque of the load-sensitive variable pump at a preset control current; the preset rotating speed and the engine gear have a one-to-one correspondence;
and determining a preset matching relation between the engine gear and the power and control current required by the pump based on the first parameter corresponding relation and the second parameter corresponding relation.
Optionally, the control system of the electronically controlled pump further comprises: a third control module;
the third control module is used for acquiring the torque of the load sensitive variable pump and the torque of the engine;
and when the torque of the load sensitive variable pump is not matched with the torque of the engine, adjusting the control current until the torque of the load sensitive variable pump is matched with the torque of the engine.
Based on the same general inventive concept, the application also provides an electric control pump which is a load sensitive variable pump and is controlled by adopting the control method of the electric control pump or the control system of the electric control pump provided by any embodiment.
Based on the same general inventive concept, the present application also protects a work machine including the electric control pump provided by the above embodiments.
Based on the foregoing, the operating modes of the work machine include a plurality of operating modes, and at least one engine gear is programmed for each operating mode.
Fig. 9 illustrates a physical schematic diagram of an electronic device, as shown in fig. 9, which may include: processor 910, communication interface (Communications Interface), memory 930, and communication bus 940, wherein processor 910, communication interface 920, and memory 930 communicate with each other via communication bus 940. Processor 910 can invoke logic instructions in memory 930 to execute a method of controlling an electronically controlled pump for application to a load-sensitive hydraulic system driven by an engine, comprising: determining a current value for matching the power required by a load sensitive variable pump of a load sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relation between the gear of the engine and the power required by the pump and the control current; based on the current value, the control current of the load-sensitive variable pump is adjusted.
Further, the logic instructions in the memory 930 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present application also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the execution of a method of controlling an electrically controlled pump provided by the methods described above, the method being applied to an engine-driven load-sensitive hydraulic system, comprising: determining a current value for matching the power required by a load sensitive variable pump of a load sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relation between the gear of the engine and the power required by the pump and the control current; based on the current value, the control current of the load-sensitive variable pump is adjusted.
In yet another aspect, the present application provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of controlling an electronically controlled pump provided by the methods described above, the method being applied to a load-sensitive hydraulic system driven by an engine, comprising: determining a current value for matching the power required by a load sensitive variable pump of a load sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relation between the gear of the engine and the power required by the pump and the control current; based on the current value, the control current of the load-sensitive variable pump is adjusted.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A control method of an electric control pump applied to a load sensitive hydraulic system driven by an engine, comprising:
determining a current value for matching the power required by a load sensitive variable pump of the load sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relation between the gear of the engine and the power required by the pump and the control current;
and adjusting the control current of the load sensitive variable pump based on the current value.
2. The method according to claim 1, wherein the determining a current value that matches the power required by the load-sensitive variable pump of the load-sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relationship between the engine gear and the power required by the pump and the control current, comprises:
acquiring the real-time gear of the engine;
determining a real-time rotational speed of the engine based on the real-time gear;
determining the actual output power of the engine based on the real-time rotational speed and an engine characteristic of the engine;
and determining the current value based on the preset matching relation.
3. The control method of an electronically controlled pump according to claim 2, wherein said determining the actual output power of the engine based on the real-time rotation speed and an engine characteristic curve of the engine comprises:
determining a theoretical output power of the engine based on the real-time rotational speed and the engine characteristic;
and subtracting the theoretical output power from the power reserve value of the engine to obtain the actual output power of the engine.
4. The method of claim 1, wherein determining the predetermined matching relationship comprises:
respectively acquiring a first parameter corresponding relation and a second parameter corresponding relation of the load-sensitive variable pump, wherein the first parameter corresponding relation is the corresponding relation of the pressure, the flow, the power and the torque of the load-sensitive variable pump at a preset rotating speed, and the second parameter corresponding relation is the corresponding relation of the pressure, the flow, the power and the torque of the load-sensitive variable pump at a preset control current; the preset rotating speed and the engine gear have a one-to-one correspondence;
and determining the preset matching relation between the engine gear and the power required by the pump and the control current based on the first parameter corresponding relation and the second parameter corresponding relation.
5. The method for controlling an electrically controlled pump according to claim 1, further comprising, before adjusting the control current of the load-sensitive variable pump:
acquiring the torque of the load-sensitive variable pump and the torque of the engine;
and when the torque of the load-sensitive variable pump is not matched with the torque of the engine, adjusting the control current until the torque of the load-sensitive variable pump is matched with the torque of the engine.
6. A control system for an electronically controlled pump for use in a load sensitive hydraulic system driven by an engine, comprising:
the current determining module is used for determining a current value for matching the power required by the load-sensitive variable pump of the load-sensitive hydraulic system with the actual output power based on the real-time gear of the engine and a preset matching relation between the gear of the engine and the power required by the pump and the control current;
and the current adjusting module is used for adjusting the control current of the load sensitive variable pump based on the current value.
7. An electrically controlled pump, characterized in that the electrically controlled pump is a load-sensitive variable pump and is controlled by a control method of an electrically controlled pump according to any one of claims 1 to 5 or by a control system of an electrically controlled pump according to claim 6.
8. A work machine comprising an electrically controlled pump according to claim 7.
9. The work machine of claim 8, wherein the operating modes of the work machine include a plurality of operating modes, and wherein at least one engine gear is programmed in each of the operating modes.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements a method of controlling an electronically controlled pump according to any one of claims 1 to 5 when executing the program.
CN202311069348.1A 2023-08-23 2023-08-23 Control method and system of electric control pump, operation machine and electronic equipment Pending CN116892504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311069348.1A CN116892504A (en) 2023-08-23 2023-08-23 Control method and system of electric control pump, operation machine and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311069348.1A CN116892504A (en) 2023-08-23 2023-08-23 Control method and system of electric control pump, operation machine and electronic equipment

Publications (1)

Publication Number Publication Date
CN116892504A true CN116892504A (en) 2023-10-17

Family

ID=88310928

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311069348.1A Pending CN116892504A (en) 2023-08-23 2023-08-23 Control method and system of electric control pump, operation machine and electronic equipment

Country Status (1)

Country Link
CN (1) CN116892504A (en)

Similar Documents

Publication Publication Date Title
US8424298B2 (en) Pump torque control system for hydraulic construction machine
CN101896871B (en) Synchronous torque balance in multiple pump systems
US9671763B2 (en) Device for controlling construction machinery
WO2010082636A1 (en) Hybrid working machine and method of controlling same
US20160340871A1 (en) Engine and Pump Control Device and Working Machine
CN103670750B (en) Power limit matching control system, method, device and engineering machinery
KR20170111606A (en) Electric oil pump control method for operating transmission of hybrid vehicle
EP2980326A1 (en) Device and method for controlling hydraulic pump in construction machine
CN102996265A (en) Engineering mechanical equipment as well as method, device and system for controlling rotation speed of engine of engineering mechanical equipment
CN103187909A (en) Motor control unit and electric pump unit
CN103835820A (en) Control method, device and system based on induction of torque of engine of rotary drilling rig
CN113236431B (en) Engineering machinery energy-saving control method and device and engineering machinery
CN113982554A (en) Fracturing equipment operation condition control method and device and fracturing equipment
CN116892504A (en) Control method and system of electric control pump, operation machine and electronic equipment
CN104929787A (en) Pumping control method
JP2019035424A (en) Hydraulic control device
CN109695489B (en) Control method and device for variable-displacement oil pump in warm-up stage, controller and vehicle
US7987035B2 (en) Method of operating a vehicle and apparatus comprising the same
CN113338384B (en) Electrically driven positive flow hydraulic control system, method and work machine
CN115822936A (en) Power control method and system for engineering machinery
CN109252970A (en) A kind of control method for engine speed, engine and vehicle
CN103925090A (en) Dynamic energy conservation system, dynamic energy conservation method and engineering machinery
GB2521657A (en) Control of a motor in an electric supercharger
CN112483426B (en) Control method, oil pump and control system
CN113203876A (en) Power takeoff fault determination method and device, electronic equipment and storage medium

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination