CN114645842A - Efficient matching control method for variable speed motor and high-power variable pump - Google Patents
Efficient matching control method for variable speed motor and high-power variable pump Download PDFInfo
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- CN114645842A CN114645842A CN202210407493.5A CN202210407493A CN114645842A CN 114645842 A CN114645842 A CN 114645842A CN 202210407493 A CN202210407493 A CN 202210407493A CN 114645842 A CN114645842 A CN 114645842A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 63
- 239000010720 hydraulic oil Substances 0.000 description 8
- 239000003921 oil Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 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
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- 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
- F04B49/20—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 by changing the driving speed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to a high-efficiency matching control method of a variable speed motor and a high-power variable pump, which comprises the following steps: starting a variable speed motor to drive a variable pump to operate, and enabling the rotating speed of the variable speed motor to be the lowest input rotating speed of the variable pump; the controller receives signals transmitted by the handle; the controller judges whether the signal is in the area a or the area b according to the signal of the handle; if the variable pump is in the area a, the rotating speed of the variable speed motor is unchanged, the handle signal is increased, and the displacement of the variable pump is gradually increased; if the variable displacement pump is in the area b, the maximum displacement of the variable displacement pump is kept unchanged, the handle signal is increased, and the rotating speed of the variable speed motor is gradually increased; changing the control angle of the handle, and repeating the steps; the handle is reset, the rotating speed of the variable speed motor is automatically adjusted to the lowest input rotating speed of the variable pump, and the oil pump is reset. According to the invention, the variable-speed motor and the variable pump are combined and matched to form a specific output mode, so that the overall efficiency is improved, the adjustment range is considered, and the adaptability is strong.
Description
Technical Field
The invention relates to the field of hydraulic oil supply control, in particular to a high-efficiency matching control method of a variable speed motor and a high-power variable pump.
Background
In the field of hydraulic oil supply control, the hydraulic oil supply control is mostly divided into two forms: 1. the servo motor is matched with the constant delivery pump, and the constant delivery pump is controlled to realize variable by adjusting the rotating speed of the servo motor, so that the method is generally suitable for occasions with low power; 2. the variable is realized by adopting a constant-speed motor matched with a hydraulic oil pump and adjusting the discharge capacity of the hydraulic oil pump, and the variable hydraulic oil pump is generally suitable for high-power occasions.
As shown in fig. 1, A, B, C three curves, each representing different oil pump displacement; by observation, it can be easily found that: under the same displacement, the higher the input rotating speed of the oil pump is, the lower the total efficiency of the oil pump is; the larger the displacement of the same oil pump input speed is, the higher the total efficiency is.
For the above form 2, in order to output a larger power, the rotation speed of the constant rotation speed motor is usually higher, which can be obtained from the graph shown in fig. 1, and the efficiency is lower in the case of a high rotation speed; and the change is realized only by adjusting the displacement of the hydraulic oil pump, the adjustable range is small, and the adaptability to special conditions is poor.
Disclosure of Invention
The purpose of the invention is:
a control method for efficient matching of a variable speed motor and a high-power variable pump is designed, the variable speed motor and the variable pump are combined and matched to form a specific output mode, overall efficiency is improved, adjustment range is considered, and adaptability is high.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a high-efficiency matching control method for a variable speed motor and a high-power variable pump comprises the following steps:
step S1: starting a variable speed motor to drive a variable pump to operate, and enabling the rotating speed of the variable speed motor to be the lowest input rotating speed of the variable pump;
step S2: the controller receives signals transmitted by the handle;
step S3: the controller judges whether the signal is in the area a or the area b according to the signal of the handle;
step S4: if the variable pump is in the area a, the rotating speed of the variable speed motor is unchanged, the input rotating speed of the variable pump is unchanged, and the displacement of the variable pump is gradually increased along with the increase of the handle signal; if the displacement is in the region b, the maximum displacement of the variable displacement pump is kept unchanged, and the rotating speed of the variable speed motor is gradually increased along with the increase of the handle signal;
step S5: changing the control angle of the handle according to actual needs, and repeating the steps S3 and S4;
step S6: the handle is reset, the rotating speed of the variable speed motor is automatically adjusted to the lowest input rotating speed of the variable pump, and the variable pump is reset.
Further, in step S3 and step S4, the set of the a region and the b region is the range of 0-100% of the handle signal.
Further, in step S3 and step S4, the boundary point between the region a and the region b is the percentage of the lowest input rotation speed of the variable displacement pump divided by the maximum output rotation speed of the variable speed motor; the interval from 0% to the percentage is the region a, and the interval from the percentage to 100% is the region b.
Further, the area a is a displacement variation stage of the variable displacement pump, in which the rotation speed of the variable speed motor keeps the lowest input rotation speed of the variable displacement pump unchanged, and the displacement of the variable displacement pump is gradually increased from 0% to 100%.
Further, the b area is a speed regulation stage of the variable speed motor, in which the displacement of the variable pump is kept constant at 100% of the maximum displacement, and the rotating speed of the variable speed motor is increased from the lowest input rotating speed of the variable pump to the maximum output rotating speed of the variable speed motor.
Further, the maximum input rotating speed of the variable pump is higher than the maximum output rotating speed of the variable speed motor.
The invention has the beneficial effects that: a variable speed motor and high-power variable pump high-efficiency cooperation control method, through the combination of variable speed motor and variable pump, and the collocation forms the specific output mode, when the signal of the hand grip is in a area, the rotational speed of the variable speed motor keeps the lowest input rotational speed of the variable pump unchanged, the displacement of the variable pump increases, limit the rotational speed, can obviously promote the overall efficiency; when the handle signal is in the b area, the displacement of the variable pump is kept constant at 100% of the maximum displacement, the rotating speed of the variable speed motor is gradually increased, the high-power adjusting range is met, the total efficiency is considered, and the adaptability to special conditions is strong.
Drawings
FIG. 1 is a prior art graphical plot of oil pump speed, oil pump displacement, and overall efficiency.
FIG. 2 is a flow chart of the steps of the method for controlling the efficient coordination of a variable speed motor and a high-power variable pump according to the present invention.
FIG. 3 is a graph of the handle signal, the displacement of the variable displacement pump and the rotation speed of the variable speed motor according to the method for controlling the efficient coordination of the variable speed motor and the high-power variable displacement pump.
Fig. 4 is an electrical schematic diagram of a control method for efficiently matching a variable speed motor with a high-power variable pump according to the invention.
In the figure: 1. a variable speed motor; 2. a variable displacement pump; 3. a controller; 4. a handle; 5. a pump control valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 2 to 4, a method for controlling a variable speed motor to efficiently cooperate with a high-power variable displacement pump includes the following steps:
step S1: starting the variable speed motor 1, driving the variable pump 2 to operate, preparing to supply hydraulic oil, and enabling the rotating speed of the variable speed motor 1 to be the lowest input rotating speed of the variable pump 2, namely 500rpm in fig. 3;
step S2: the control handle 4, the controller 3 receives the signal from the handle 4;
step S3: the controller 3 judges whether the signal is in an area a or an area b according to the signal of the handle 4, and specifically, the signal is determined according to the ratio of the angle of the position of the handle 4 to the total stroke angle;
step S4: if the variable-speed motor is in the region a, the rotating speed of the variable-speed motor 1 is unchanged, namely the input rotating speed of the variable-speed pump 2 is unchanged, and the displacement of the variable-speed pump 2 is gradually increased along with the increase of the signal of the handle 4, namely the displacement is larger and the efficiency is higher under the same rotating speed; if the variable displacement pump 2 is in the area b, the maximum displacement of the variable displacement pump 2 is kept unchanged, the rotating speed of the variable speed motor 1 is gradually increased along with the increase of the signal of the handle 4, namely the variable displacement pump 2 is the maximum displacement, the displacement is taken as a factor influencing the total efficiency, the total efficiency is guaranteed as much as possible, in order to meet the power required by the system, the variable displacement pump can be realized only by the rotating speed, namely the total efficiency is guaranteed as much as possible on the premise of meeting the power requirement;
step S5: changing the control angle of the handle 4 according to actual needs, monitoring the signal of the handle 4 by the controller 3 in real time, and repeating the step S3 and the step S4, namely realizing a real-time feedback and closed-loop process;
step S6: after the operation is finished, the handle 4 is reset, the rotating speed of the variable speed motor 1 is automatically adjusted to the lowest input rotating speed of the variable pump 2, and the variable pump 2 is reset, so that the energy-saving effect is realized.
In step S3 and step S4, the set of the a region and the b region is the 0-100% interval of the handle 4 signal; as shown in fig. 3, the minimum input rotation speed of the variable pump 2 is 500rpm, the maximum output rotation speed of the variable speed motor 1 is 3000rpm, and the maximum input rotation speed of the variable pump 2 is 3200 rpm.
In steps S3 and S4, the boundary point between the a-zone and the b-zone is a percentage of the lowest input rotation speed of the variable pump 2 divided by the maximum output rotation speed of the variable speed motor 1, i.e., 500/3000 is 16.67%; the interval from 0% to the percentage is the a area, i.e. the signal of the handle 4 is the a area from 0% to 16.67%, and the interval from the percentage to 100% is the b area, i.e. the signal of the handle 4 is the b area from 16.67% to 100%.
The area a is a displacement variation stage of the variable pump 2, in the stage, the rotating speed of the variable speed motor 1 keeps the lowest input rotating speed of the variable pump 2 unchanged, and the displacement of the variable pump 2 is gradually increased from 0% to 100%; because the larger the displacement is, the higher the efficiency is at the same rotating speed, the displacement of the variable displacement pump 2 is preferably increased under the condition that the rotating speed of the variable speed motor 1 is not increased, and the total efficiency in the interval of 0-100% is further increased. In addition, the variable speed motor 1 is maintained at a low rotation speed, which is beneficial to energy saving.
The b area is a speed regulation stage of the variable speed motor 1, in the stage, the displacement of the variable pump 2 is kept unchanged at 100% of the maximum displacement, and the rotating speed of the variable speed motor 1 is increased from the lowest input rotating speed of the variable pump 2 to the maximum output rotating speed of the variable speed motor 1; in this stage, the displacement of the variable displacement pump 2 is maintained at the maximum, so the total efficiency is already guaranteed as much as possible, and in order to achieve the required power, only the rotation speed of the variable speed motor 1 is increased.
The maximum input rotating speed of the variable pump 2 is higher than the maximum output rotating speed of the variable motor 1, namely the rotating speed which can be borne by the variable pump 2 is higher than the maximum output rotating speed of the variable motor 1, and 3200rpm is higher than 3000rpm, so that safety redundancy is realized, and the service life and safety are ensured.
The variable speed motor 1 is specifically a variable speed permanent magnet motor; the variable pump 2 is specifically an electric proportional variable hydraulic pump; as shown in fig. 4, the controller 3 is electrically connected to the variable speed motor 1, the handle 4 and the pump control valve 5 of the variable pump 2, and the controller 3 is configured to collect a point signal and output a control signal after logic operation; the pump control valve 5 is used to control the displacement of the variable displacement pump 2. In fig. 4, the motor is a variable speed motor 1.
As shown in fig. 3, the motor rotation speed in fig. 3, that is, the output rotation speed of the variable speed motor 1, is also the input rotation speed of the variable pump 2; the oil pump displacement in fig. 3 is the displacement of the variable displacement pump 2; it can be seen that when in the region a of 0% to 16.67%, the rotation speed of the variable speed motor 1 is maintained at 500rpm, and the displacement of the variable pump 2 is linearly increased from 0% to 100%; when the displacement of the variable pump 2 is maintained to be 100% when the displacement is in the b region of 16.67% to 100%, the rotating speed of the variable speed motor 1 is linearly increased to the maximum 3000rpm along with the increase of the signal of the handle 4; when the rotation speed of the variable speed motor 1 is 3000rpm, the state of the maximum output power is obtained.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above examples are intended to further illustrate the present invention, but are not intended to limit the invention to these specific embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be understood to be within the protection scope of the present invention.
Claims (6)
1. A control method for efficient matching of a variable speed motor and a high-power variable pump is characterized by comprising the following steps:
step S1: starting a variable speed motor to drive a variable pump to operate, and enabling the rotating speed of the variable speed motor to be the lowest input rotating speed of the variable pump;
step S2: the controller receives signals transmitted by the handle;
step S3: the controller judges whether the signal is in the area a or the area b according to the signal of the handle;
step S4: if the variable pump is in the area a, the rotating speed of the variable speed motor is unchanged, the input rotating speed of the variable pump is unchanged, and the displacement of the variable pump is gradually increased along with the increase of the handle signal; if the displacement is in the region b, the maximum displacement of the variable displacement pump is kept unchanged, and the rotating speed of the variable speed motor is gradually increased along with the increase of the handle signal;
step S5: changing the control angle of the handle according to actual needs, and repeating the steps S3 and S4;
step S6: the handle is reset, the rotating speed of the variable speed motor is automatically adjusted to the lowest input rotating speed of the variable pump, and the variable pump is reset.
2. The efficient matching control method for the variable speed motor and the high-power variable pump as claimed in claim 1, wherein the efficient matching control method comprises the following steps: in steps S3 and S4, the set of the a region and the b region is the range of 0-100% of the handle signal.
3. The efficient matching control method for the variable speed motor and the high-power variable pump as claimed in claim 2, wherein the efficient matching control method comprises the following steps: in step S3 and step S4, the boundary point between the a zone and the b zone is the percentage of the lowest input rotation speed of the variable pump divided by the maximum output rotation speed of the variable speed motor; the interval from 0% to the percentage is the area a, and the interval from the percentage to 100% is the area b.
4. The efficient matching control method for the variable speed motor and the high-power variable pump as claimed in claim 3, wherein the efficient matching control method comprises the following steps: the area a is a displacement variation stage of the variable pump, in the stage, the rotating speed of the variable speed motor keeps the lowest input rotating speed of the variable pump unchanged, and the displacement of the variable pump is gradually increased from 0% to 100%.
5. The efficient matching control method for the variable speed motor and the high-power variable pump as claimed in claim 4, wherein the efficient matching control method comprises the following steps: the b area is a speed regulation stage of the variable speed motor, in the stage, the displacement of the variable pump maintains 100% of the maximum displacement, and the rotating speed of the variable speed motor is increased from the lowest input rotating speed of the variable pump to the maximum output rotating speed of the variable speed motor.
6. The efficient matching control method for the variable speed motor and the high-power variable pump as claimed in claim 5, wherein the efficient matching control method comprises the following steps: the maximum input rotating speed of the variable pump is higher than the maximum output rotating speed of the variable speed motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210407493.5A CN114645842B (en) | 2022-04-19 | 2022-04-19 | Efficient matching control method for variable speed motor and high-power variable displacement pump |
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| CN202210407493.5A CN114645842B (en) | 2022-04-19 | 2022-04-19 | Efficient matching control method for variable speed motor and high-power variable displacement pump |
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| CN114645842B CN114645842B (en) | 2024-10-22 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486106A (en) * | 1993-10-18 | 1996-01-23 | Hehl; Karl | Hydraulic device for supplying a hydraulic driving unit |
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| CN102155033A (en) * | 2011-04-01 | 2011-08-17 | 山推工程机械股份有限公司 | Load feedback speed control method of driving system of hydrostatic bulldozer |
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| CN103588097A (en) * | 2012-08-17 | 2014-02-19 | 徐工集团工程机械股份有限公司 | Hoisting control system |
| CN106499614A (en) * | 2016-10-28 | 2017-03-15 | 合肥工业大学 | Hydraulic energy-saving system and control method that variable speed electric motors, particularly is mated with variable displacement with constant power pump |
| CN109372832A (en) * | 2018-12-21 | 2019-02-22 | 合肥工业大学 | A kind of bivariate hydraulic system energy consumption optimization method under operating condition variation |
| CN112874630A (en) * | 2021-01-08 | 2021-06-01 | 北京理工大学 | Integrated steering control scheme for double-pump double-motor hydrostatic driving tracked vehicle |
-
2022
- 2022-04-19 CN CN202210407493.5A patent/CN114645842B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486106A (en) * | 1993-10-18 | 1996-01-23 | Hehl; Karl | Hydraulic device for supplying a hydraulic driving unit |
| CN101993006A (en) * | 2010-10-12 | 2011-03-30 | 三一汽车起重机械有限公司 | Automobile crane and energy-saving control method and energy-saving control system thereof |
| CN102155033A (en) * | 2011-04-01 | 2011-08-17 | 山推工程机械股份有限公司 | Load feedback speed control method of driving system of hydrostatic bulldozer |
| CN102493953A (en) * | 2012-01-05 | 2012-06-13 | 三一汽车起重机械有限公司 | Energy-saving control system, truck crane and energy-saving control method |
| CN103588097A (en) * | 2012-08-17 | 2014-02-19 | 徐工集团工程机械股份有限公司 | Hoisting control system |
| CN106499614A (en) * | 2016-10-28 | 2017-03-15 | 合肥工业大学 | Hydraulic energy-saving system and control method that variable speed electric motors, particularly is mated with variable displacement with constant power pump |
| CN109372832A (en) * | 2018-12-21 | 2019-02-22 | 合肥工业大学 | A kind of bivariate hydraulic system energy consumption optimization method under operating condition variation |
| CN112874630A (en) * | 2021-01-08 | 2021-06-01 | 北京理工大学 | Integrated steering control scheme for double-pump double-motor hydrostatic driving tracked vehicle |
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