CN107255071B - It is pumped control method and its control system - Google Patents
It is pumped control method and its control system Download PDFInfo
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- CN107255071B CN107255071B CN201710675709.5A CN201710675709A CN107255071B CN 107255071 B CN107255071 B CN 107255071B CN 201710675709 A CN201710675709 A CN 201710675709A CN 107255071 B CN107255071 B CN 107255071B
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- pressure difference
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- duty ratio
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- difference section
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Classifications
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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
-
- 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
- F04B2205/00—Fluid parameters
- F04B2205/07—Pressure difference over the pump
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention relates to a kind of pump pressure control method and control system, the present invention preset multiple pressure difference sections and with the multiple one-to-one initial duty cycle in pressure difference section, there is in the multiple pressure difference section a permission pressure difference section；Pump pressure value is detected by default detection interval time, its pressure difference between predetermined target value is calculated, judges the pressure difference section that the pressure difference is fallen into, motor is controlled by actuator and executes the corresponding execution duty ratio control pump pressure in the pressure difference section.The present invention can accurately control pump pressure near target pump pressure value, and duty ratio can be adaptive with the situation for pumping itself, and adaptability is higher.
Description
Technical field
The present invention relates to pump pressure control technology field more particularly to a kind of pump pressure control methods and its control system.
Background technique
In order to meet actual demand, generally requires to control pump pressure, such as the pressure of urea pump is controlled.
Urea pump is a critical component in commercial vehicle SCR system, and for pressurizeing to urea, pressure control is existed
In a certain range, when the conditions are met, control urea injection carries out tail gas clean-up.
Urea pump is one of failure frequent point, and replacement cost is high, can reduce cost to its Measuring error.Measuring error is set
Pressure control algorithm in standby is key factor, obtains in range as pressure cannot be stablized suitable, then testing result can be made to occur
Error.
Compress control method currently on the market is to detect actual pressure by pressure sensor, controls motor by actuator
Duty ratio controlled:
Goal pressure is P0, in the range of: P1 > P0 > P2.
When actual pressure is greater than the maximum value P1 of goal pressure, lesser duty ratio C1 is executed；When actual pressure is less than
When goal pressure minimum value P2, biggish duty ratio C2 is executed；When such as actual pressure between P1 and P2, current duty is kept
Than.
This method haves the defects that as follows:
1) due to test in nozzle can open injection urea, urea pressure oscillation is big, above-mentioned control algolithm cannot will
Pressure is stablized near target value.
2) since, there are individual difference, preset duty ratio does not adapt to each pump, above-mentioned control method between each pump
Adaptability is poor.
Summary of the invention
Based on this, in view of the above technical problems, a kind of pump pressure control method and its control system are provided.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of pump pressure control method, comprising:
Preset multiple pressure difference sections and with the multiple one-to-one initial duty cycle in pressure difference section, it is described more
There is a permission pressure difference section in a pressure difference section；
Pump pressure value is detected by default detection interval time, its pressure difference between predetermined target value is calculated, judges the pressure
The pressure difference section that power difference is fallen into controls motor by actuator and executes the corresponding execution duty ratio control in the pressure difference section
Pump pressure:
When detecting first time, the execution duty ratio is assigned a value of the corresponding initial duty cycle in current pressure difference section；
Each detection later, if current pressure difference section is fallen into for the first time, the execution duty ratio is assigned a value of working as
The corresponding initial duty cycle in preceding pressure difference section, conversely, then the execution duty ratio is assigned a value of updated value；Also, to current pressure
Power difference section is compared with the permission pressure difference section, according to comparison result, the pressure fallen into when being detected to the last time
The corresponding execution duty ratio in poor section is updated:
If current pressure difference section is identical as the permission pressure difference section, the pressure difference that is fallen into when last time detection
The corresponding execution duty ratio in section is updated value；
If current pressure difference section is less than the permission pressure difference section, the pressure difference fallen into when the last time is detected
The corresponding execution duty ratio in section is updated to plus an adjusted value；
If current pressure difference section is greater than the permission pressure difference section, the pressure difference fallen into when the last time is detected
The corresponding execution duty ratio in section is updated to subtract an adjusted value.
This programme further include:
Default and the one-to-one largest duty cycle value in the multiple pressure difference section and duty ratio minimum value；
If the execution duty ratio is greater than the corresponding largest duty cycle value in relevant pressure difference section, by the execution duty
Than being assigned a value of the largest duty cycle value, if the execution duty ratio is less than the corresponding duty ratio minimum value in relevant pressure difference section,
The execution duty ratio is then assigned a value of the duty ratio minimum value.
The adjusted value is 1.
The pressure difference section is 7:
40 pressure difference >=30 >；
30 pressure difference >=20 >；
20 pressure difference >=10 >；
10 pressure difference >=-10 >；
- 10 pressure difference >=-20 >；
- 20 pressure difference >=-30 >；
- 30 pressure difference >=-40 >；
Wherein, 10 pressure difference >=-10 > of section are to allow pressure difference section.
This programme further relates to a kind of pump pressure control system, including memory module, is stored with a plurality of finger in the memory module
It enables, described instruction is loaded and executed by processor:
Preset multiple pressure difference sections and with the multiple one-to-one initial duty cycle in pressure difference section, it is described more
There is a permission pressure difference section in a pressure difference section；
Pump pressure value is detected by default detection interval time, its pressure difference between predetermined target value is calculated, judges the pressure
The pressure difference section that power difference is fallen into controls motor by actuator and executes the corresponding execution duty ratio control in the pressure difference section
Pump pressure:
When detecting first time, the execution duty ratio is assigned a value of the corresponding initial duty cycle in current pressure difference section；
Each detection later, if current pressure difference section is fallen into for the first time, the execution duty ratio is assigned a value of working as
The corresponding initial duty cycle in preceding pressure difference section, conversely, then the execution duty ratio is assigned a value of updated value；Also, to current pressure
Power difference section is compared with the permission pressure difference section, according to comparison result, the pressure fallen into when being detected to the last time
The corresponding execution duty ratio in poor section is updated:
If current pressure difference section is identical as the permission pressure difference section, the pressure difference that is fallen into when last time detection
The corresponding execution duty ratio in section is updated value；
If current pressure difference section is less than the permission pressure difference section, the pressure difference fallen into when the last time is detected
The corresponding execution duty ratio in section is updated to plus an adjusted value；
If current pressure difference section is greater than the permission pressure difference section, the pressure difference fallen into when the last time is detected
The corresponding execution duty ratio in section is updated to subtract an adjusted value.
Described instruction is also loaded and is executed by processor:
Default and the one-to-one largest duty cycle value in the multiple pressure difference section and duty ratio minimum value；
If the execution duty ratio is greater than the corresponding largest duty cycle value in relevant pressure difference section, by the execution duty
Than being assigned a value of the largest duty cycle value, if the execution duty ratio is less than the corresponding duty ratio minimum value in relevant pressure difference section,
The execution duty ratio is then assigned a value of the duty ratio minimum value.
The adjusted value is 1.
Preset pressure difference section is 7:
40 pressure difference >=30 >；
30 pressure difference >=20 >；
20 pressure difference >=10 >；
10 pressure difference >=-10 >；
- 10 pressure difference >=-20 >；
- 20 pressure difference >=-30 >；
- 30 pressure difference >=-40 >；
Wherein, 10 pressure difference >=-10 > of section are to allow pressure difference section.
The present invention can accurately control pump pressure near target pump pressure value, and duty ratio can be adaptive with the situation for pumping itself
It answers, adaptability is higher.
Specific embodiment
The present invention relates to a kind of pump pressure control methods, comprising:
One, preset multiple pressure difference sections and with multiple one-to-one initial duty cycles in pressure difference section, multiple pressures
There is a permission pressure difference section in power difference section.
Wherein, pressure difference refers to the difference between pump pressure value and predetermined target value, allows pressure difference area when pressure difference is fallen into
Between when, illustrate that pump pressure value at this time is suitable near predetermined target value.
Preferably, the present embodiment has also been preset and the one-to-one largest duty cycle value in multiple pressure difference sections and duty ratio
Minimum value.
Pressure difference section, initial duty cycle and largest duty cycle value and duty ratio minimum value are referring to table 1, wherein section
10 > Δ P >=-10 are to allow pressure difference section.
| Pressure differential Δ P | Initial duty cycle | Maximum permissible value | Minimum allowable value |
| 40 > Δ P >=30 | 10 | 20 | 0 |
| 30 > Δ P >=20 | 20 | 30 | 10 |
| 20 > Δ P >=10 | 30 | 40 | 20 |
| 10 > Δ P >=-10 | 40 | 50 | 30 |
| - 10 > Δ P >=-20 | 50 | 60 | 40 |
| - 20 > Δ P >=-30 | 60 | 70 | 50 |
| - 30 > Δ P >=-40 | 70 | 80 | 60 |
Table 1
Two, pump pressure value is detected by default detection interval time, calculates its pressure difference between predetermined target value, judgement should
The pressure difference section that pressure difference is fallen into controls motor by actuator and executes the corresponding execution duty ratio control in the pressure difference section
System pump pressure:
When detecting first time, executes duty ratio and be assigned a value of the corresponding initial duty cycle in current pressure difference section.
Each detection later executes following steps:
If 1, current pressure difference section is fallen into for the first time, executing duty ratio, to be assigned a value of current pressure difference section corresponding
Initial duty cycle, conversely, then executing duty ratio is assigned a value of updated value.
2, current pressure difference section is compared with pressure difference section is allowed, according to comparison result, the last time is detected
When the corresponding execution duty ratio in pressure difference section that is fallen into be updated:
If current pressure difference section is identical as pressure difference section is allowed, illustrate the pressure difference area fallen into when last detection
Between corresponding execution duty ratio be it is suitable, then the corresponding execution duty ratio in pressure difference section fallen into when last detection is i.e.
For updated value.
If current pressure difference section, which is less than, allows pressure difference section, illustrate the pressure difference section fallen into when last detection
Corresponding execution duty ratio is to small, the then corresponding execution duty ratio update in the pressure difference section fallen into when detecting the last time
For plus an adjusted value.
If current pressure difference section, which is greater than, allows pressure difference section, illustrate the pressure difference section fallen into when last detection
Corresponding execution duty ratio is to big, the then corresponding execution duty ratio update in the pressure difference section fallen into when detecting the last time
To subtract an adjusted value.
In the present embodiment, adjusted value 1.
Preferably, duty will be executed if executing duty ratio is greater than the corresponding largest duty cycle value in relevant pressure difference section
It, will if executing duty ratio is less than the corresponding duty ratio minimum value in relevant pressure difference section than being assigned a value of the largest duty cycle value
It executes duty ratio and is assigned a value of the duty ratio minimum value.
By above-mentioned update step, practical pump pressure can be accurately controlled near target value, duty ratio can be with pump itself
Situation it is adaptive, adaptability is higher.Below with reference to table 1, technical solution of the present invention is said by taking certain urea pump as an example
It is bright:
Goal pressure is set as 550.
Assuming that when the 1st detection, current pressure 523, pressure difference is -27, as it can be seen from table 1 the section fallen into be -
20 > Δ P >=-30 execute duty ratio and are assigned a value of initial duty cycle 60, it is therefore an objective to pressure be risen between 540-560, that is, pressed
Power difference Δ P is fallen into when allowing 10 > Δ P >=-10 of section, and it is suitable for executing duty ratio.
When the 2nd detection:
If pressure has become 545, pressure differential Δ P, which is fallen into, allows 10 > Δ P >=-10 of section, illustrates that executing duty ratio 60 is
Suitably, when falling into -20 > Δ P >=-30 of section next time, 60 duty ratios are still executed.
If pressure has become 570, as it can be seen from table 1 pressure differential Δ P falls into 30 > Δ P >=20 of section, by the section pair
The execution duty ratio answered is assigned a value of initial duty cycle 20, executes the duty ratio, permits simultaneously as 30 > Δ P >=20 of section are greater than
Perhaps section illustrates that last execution duty ratio 60 is too big, needs to reduce, then pressure difference falls into -20 > Δ P of section next time
When >=-30, duty ratio is updated to 60-1=59.
If pressure becomes 535, as it can be seen from table 1 pressure differential Δ P falls into -10 > Δ P >=-20 of section, by the section pair
The execution duty ratio answered is assigned a value of initial duty cycle 50, executes the duty ratio, simultaneously as -10 > Δ P >=-20 of section is less than
Allow section, illustrates that last execution duty ratio 60 is too small, need to increase, then pressure difference falls into -20 > of section next time
When Δ P >=-30, duty ratio is updated to 60+1=61.
The invention further relates to a kind of pump pressure control system, including memory module, it is stored with a plurality of instruction in memory module, is referred to
Order is loaded and is executed by processor:
One, preset multiple pressure difference sections and with multiple one-to-one initial duty cycles in pressure difference section, multiple pressures
There is a permission pressure difference section in power difference section.
Wherein, pressure difference refers to the difference between pump pressure value and predetermined target value, allows pressure difference area when pressure difference is fallen into
Between when, illustrate that pump pressure value at this time is suitable near predetermined target value.
Preferably, the present embodiment has also been preset and the one-to-one largest duty cycle value in multiple pressure difference sections and duty ratio
Minimum value.
Pressure difference section, initial duty cycle and largest duty cycle value and duty ratio minimum value are referring to table 1, wherein section
10 > Δ P >=-10 are to allow pressure difference section.
| Pressure differential Δ P | Initial duty cycle | Maximum permissible value | Minimum allowable value |
| 40 > Δ P >=30 | 10 | 20 | 0 |
| 30 > Δ P >=20 | 20 | 30 | 10 |
| 20 > Δ P >=10 | 30 | 40 | 20 |
| 10 > Δ P >=-10 | 40 | 50 | 30 |
| - 10 > Δ P >=-20 | 50 | 60 | 40 |
| - 20 > Δ P >=-30 | 60 | 70 | 50 |
| - 30 > Δ P >=-40 | 70 | 80 | 60 |
Table 1
Two, pump pressure value is detected by default detection interval time, calculates its pressure difference between predetermined target value, judgement should
The pressure difference section that pressure difference is fallen into controls motor by actuator and executes the corresponding execution duty ratio control in the pressure difference section
System pump pressure:
When detecting first time, executes duty ratio and be assigned a value of the corresponding initial duty cycle in current pressure difference section.
Each detection later executes following steps:
If 1, current pressure difference section is fallen into for the first time, executing duty ratio, to be assigned a value of current pressure difference section corresponding
Initial duty cycle, conversely, then executing duty ratio is assigned a value of updated value.
2, current pressure difference section is compared with pressure difference section is allowed, according to comparison result, the last time is detected
When the corresponding execution duty ratio in pressure difference section that is fallen into be updated:
If current pressure difference section is identical as pressure difference section is allowed, illustrate the pressure difference area fallen into when last detection
Between corresponding execution duty ratio be it is suitable, then the corresponding execution duty ratio in pressure difference section fallen into when last detection is i.e.
For updated value.
If current pressure difference section, which is less than, allows pressure difference section, illustrate the pressure difference section fallen into when last detection
Corresponding execution duty ratio is to small, the then corresponding execution duty ratio update in the pressure difference section fallen into when detecting the last time
For plus an adjusted value.
If current pressure difference section, which is greater than, allows pressure difference section, illustrate the pressure difference section fallen into when last detection
Corresponding execution duty ratio is to big, the then corresponding execution duty ratio update in the pressure difference section fallen into when detecting the last time
To subtract an adjusted value.
In the present embodiment, adjusted value 1.
Preferably, duty will be executed if executing duty ratio is greater than the corresponding largest duty cycle value in relevant pressure difference section
It, will if executing duty ratio is less than the corresponding duty ratio minimum value in relevant pressure difference section than being assigned a value of the largest duty cycle value
It executes duty ratio and is assigned a value of the duty ratio minimum value.
The present invention can accurately control pump pressure near target pump pressure value, and duty ratio can be adaptive with the situation for pumping itself
It answers, adaptability is higher.
But those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate this
Invention, and be not used as limitation of the invention, as long as in spirit of the invention, to embodiment described above
Variation, modification will all fall within the scope of claims of the present invention.
Claims (8)
1. a kind of pump pressure control method characterized by comprising
Preset multiple pressure difference sections and with the multiple one-to-one initial duty cycle in pressure difference section, the multiple pressure
There is a permission pressure difference section in power difference section；
Pump pressure value is detected by default detection interval time, its pressure difference between predetermined target value is calculated, judges the pressure difference
The pressure difference section fallen into controls motor by actuator and executes the corresponding execution duty ratio control pump in the pressure difference section
Pressure:
When detecting first time, the execution duty ratio is assigned a value of the corresponding initial duty cycle in current pressure difference section；
Each detection later, if current pressure difference section is fallen into for the first time, the execution duty ratio is assigned a value of currently pressing
The corresponding initial duty cycle in power difference section, conversely, then the execution duty ratio is assigned a value of updated value；Also, it is poor to current pressure
Section is compared with the permission pressure difference section, according to comparison result, the pressure difference area fallen into when being detected to the last time
Between corresponding execution duty ratio be updated:
If current pressure difference section is identical as the permission pressure difference section, the pressure difference section that is fallen into when last time detection
Corresponding execution duty ratio is updated value；
If current pressure difference section is less than the permission pressure difference section, the pressure difference section fallen into when the last time is detected
Corresponding execution duty ratio is updated to plus an adjusted value；
If current pressure difference section is greater than the permission pressure difference section, the pressure difference section fallen into when the last time is detected
Corresponding execution duty ratio is updated to subtract an adjusted value.
2. a kind of pump pressure control method according to claim 1, which is characterized in that further include:
Default and the one-to-one largest duty cycle value in the multiple pressure difference section and duty ratio minimum value；
If the execution duty ratio is greater than the corresponding largest duty cycle value in relevant pressure difference section, the execution duty ratio is assigned
Value is the largest duty cycle value, will if the execution duty ratio is less than the corresponding duty ratio minimum value in relevant pressure difference section
The execution duty ratio is assigned a value of the duty ratio minimum value.
3. a kind of pump pressure control method according to claim 1 or 2, which is characterized in that the adjusted value is 1.
4. a kind of pump pressure control method according to claim 3, which is characterized in that the pressure difference section is 7:
40 pressure difference >=30 >；
30 pressure difference >=20 >；
20 pressure difference >=10 >；
10 pressure difference >=-10 >；
- 10 pressure difference >=-20 >；
- 20 pressure difference >=-30 >；
- 30 pressure difference >=-40 >；
Wherein, 10 pressure difference >=-10 > of section are to allow pressure difference section.
5. a kind of pump pressure control system, which is characterized in that including memory module, a plurality of instruction is stored in the memory module,
Described instruction is loaded and is executed by processor:
Preset multiple pressure difference sections and with the multiple one-to-one initial duty cycle in pressure difference section, the multiple pressure
There is a permission pressure difference section in power difference section；
Pump pressure value is detected by default detection interval time, its pressure difference between predetermined target value is calculated, judges the pressure difference
The pressure difference section fallen into controls motor by actuator and executes the corresponding execution duty ratio control pump in the pressure difference section
Pressure:
When detecting first time, the execution duty ratio is assigned a value of the corresponding initial duty cycle in current pressure difference section；
Each detection later, if current pressure difference section is fallen into for the first time, the execution duty ratio is assigned a value of currently pressing
The corresponding initial duty cycle in power difference section, conversely, then the execution duty ratio is assigned a value of updated value；Also, it is poor to current pressure
Section is compared with the permission pressure difference section, according to comparison result, the pressure difference area fallen into when being detected to the last time
Between corresponding execution duty ratio be updated:
If current pressure difference section is identical as the permission pressure difference section, the pressure difference section that is fallen into when last time detection
Corresponding execution duty ratio is updated value；
If current pressure difference section is less than the permission pressure difference section, the pressure difference section fallen into when the last time is detected
Corresponding execution duty ratio is updated to plus an adjusted value；
If current pressure difference section is greater than the permission pressure difference section, the pressure difference section fallen into when the last time is detected
Corresponding execution duty ratio is updated to subtract an adjusted value.
6. a kind of pump pressure control system according to claim 5, which is characterized in that described instruction is also loaded simultaneously by processor
It executes:
Default and the one-to-one largest duty cycle value in the multiple pressure difference section and duty ratio minimum value；
If the execution duty ratio is greater than the corresponding largest duty cycle value in relevant pressure difference section, the execution duty ratio is assigned
Value is the largest duty cycle value, will if the execution duty ratio is less than the corresponding duty ratio minimum value in relevant pressure difference section
The execution duty ratio is assigned a value of the duty ratio minimum value.
7. a kind of pump pressure control system according to claim 6, which is characterized in that the adjusted value is 1.
8. a kind of pump pressure control system according to claim 7, which is characterized in that preset pressure difference section is 7:
40 pressure difference >=30 >；
30 pressure difference >=20 >；
20 pressure difference >=10 >；
10 pressure difference >=-10 >；
- 10 pressure difference >=-20 >；
- 20 pressure difference >=-30 >；
- 30 pressure difference >=-40 >；
Wherein, 10 pressure difference >=-10 > of section are to allow pressure difference section.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710675709.5A CN107255071B (en) | 2017-08-09 | 2017-08-09 | It is pumped control method and its control system |
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|---|---|---|---|
| CN201710675709.5A CN107255071B (en) | 2017-08-09 | 2017-08-09 | It is pumped control method and its control system |
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| CN107255071B true CN107255071B (en) | 2019-03-01 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113958390B (en) * | 2021-10-15 | 2022-08-23 | 潍柴动力股份有限公司 | Urea pump pressure building duty ratio self-learning method |
| CN114837926A (en) * | 2022-05-06 | 2022-08-02 | 纬湃汽车电子(芜湖)有限公司 | Control method for double fuel pumps |
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| CN1225976A (en) * | 1998-02-10 | 1999-08-18 | 丰田自动车株式会社 | Fluid pump control apparatus and method |
| CN101418800A (en) * | 2008-11-17 | 2009-04-29 | 岑焕军 | Control system for intelligent frequency conversion screw air compressor |
| CN101634304A (en) * | 2008-07-25 | 2010-01-27 | 台达电子工业股份有限公司 | Constant-pressure fluid control method |
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| CN103883409A (en) * | 2014-03-14 | 2014-06-25 | 潍柴动力股份有限公司 | Double-actuator switching control method and device |
| DE10002293B4 (en) * | 1999-07-15 | 2015-06-18 | Institut für Luft- und Kältetechnik gemeinnützige Gesellschaft mbH | Method for operating multistage compressors |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008038833A (en) * | 2006-08-09 | 2008-02-21 | Calsonic Kansei Corp | Control device for variable displacement compressor and its method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2252770A5 (en) * | 1973-11-28 | 1975-06-20 | Jeumont Schneider | High-pressure water pumping station control system - prepares different operating pattern each time set is started |
| CN1225976A (en) * | 1998-02-10 | 1999-08-18 | 丰田自动车株式会社 | Fluid pump control apparatus and method |
| DE10002293B4 (en) * | 1999-07-15 | 2015-06-18 | Institut für Luft- und Kältetechnik gemeinnützige Gesellschaft mbH | Method for operating multistage compressors |
| CN101634304A (en) * | 2008-07-25 | 2010-01-27 | 台达电子工业股份有限公司 | Constant-pressure fluid control method |
| CN101418800A (en) * | 2008-11-17 | 2009-04-29 | 岑焕军 | Control system for intelligent frequency conversion screw air compressor |
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| CN103640249A (en) * | 2013-11-29 | 2014-03-19 | 中国工程物理研究院化工材料研究所 | Pressure accuracy control method for isotemperature static pressing |
| CN103883409A (en) * | 2014-03-14 | 2014-06-25 | 潍柴动力股份有限公司 | Double-actuator switching control method and device |
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| Publication number | Publication date |
|---|---|
| CN107255071A (en) | 2017-10-17 |
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