CN105782047A - Controller and control method for fuzzy control over screw air compressor - Google Patents
Controller and control method for fuzzy control over screw air compressor Download PDFInfo
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- CN105782047A CN105782047A CN201511020200.4A CN201511020200A CN105782047A CN 105782047 A CN105782047 A CN 105782047A CN 201511020200 A CN201511020200 A CN 201511020200A CN 105782047 A CN105782047 A CN 105782047A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
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Abstract
The invention discloses a controller and a control method for fuzzy control over a screw air compressor and belongs to the field of air compressors. The controller comprises an air compressor controller body U2U2, a transformer T1, an alternating current contactor KM1, an alternating current contactor KM2, an alternating current contactor KM3, an alternating current contactor KM4, an alternating current contactor KM5, an alternating current contactor KM6, an air switch CT1, an air switch CT2, a fuse F1, a fuse F2, a fuse F3, a temperature sensor R1, a pressure sensor P1, a button S1, a frequency transformer U1, a draught fan M2 and the air compressor M1. By the adoption of fuzzy control, the air compressor can switch between a power frequency control mode and a variable frequency control mode, the advantages of two existing machine types are combined, the problems that a power frequency machine cannot save energy, and a variable frequency machine is unstable are solved, a touch screen serves as a human-computer interface, user operation is convenient, optimization is conducted according to an existing control mode of a main motor of the variable frequency machine, and the power consumption is lower.
Description
Technical field
The invention belongs to field of air compressor.
Background technology
The air compressor market of China is mainly made up of air compressors such as piston type, screw, centrifugal, slide sheet types, and wherein piston type accounting is maximum, next to that screw, centrifugal, slide sheet type, vortex etc..In recent years, along with the development of screw air compressor and centrifugal air compressor, piston type air compressor proportion in the industry declines to some extent, but it is still dominated occuping market at present.Compared to piston type air compressor, it is low that screw-rod air compressor has operating cost, from the whole life cycle of machine, the rate of return on investment of screw machine is higher by 20% than piston machine, the advantages such as energy-saving effect is obvious, therefore, screw-rod air compressor starts progressively to substitute piston type air compressor in a lot of fields.
Along with the development of screw air compressor industry, occurring in that the different type of machines such as power frequency machine, frequency changer successively, but existing frequency conversion air compressor controller all adopts pid algorithm controls, pressure inaccuracy, fluctuation range is big, and power consumption is high, poor operability.
Summary of the invention
It is an object of the invention to provide a kind of obfuscation and control the controller of screw air compressor, employing obfuscation controls, air compressor machine can be allowed to switch in power frequency, VFC mode, merged the advantage of existing two kinds of types, solved power frequency machine not energy-conservation, the problem that frequency changer is unstable, man machine interface adopts touch screen, user-friendly, for existing frequency changer mair motor control mode, optimizing, power consumption is lower.
nullFor achieving the above object，The present invention is by the following technical solutions: a kind of obfuscation controls the controller of screw air compressor，Including air compressor controller U2U2、Transformator T1、A.C. contactor KM1、A.C. contactor KM2、A.C. contactor KM3、A.C. contactor KM4、A.C. contactor KM5、A.C. contactor KM6、Air switch CT1、Air switch CT2、Fuse F1、Fuse F2、Fuse F3、Temperature sensor R1、Pressure transducer P1、Button S1、Converter U1、Blower fan M2 and air compressor machine M1，Described air compressor controller U2 includes touch screen module、1～No. 40 terminals、First serial and second serial，Described first serial connects the communication ends of converter，Touch screen module electrically connects with described air compressor controller U2，Described 1～No. 3 terminals connect 380V alternating current power supply，Described 4～No. 5 terminals connect 24V alternating current power supply，The foot 4 of described No. 6 terminals connection transformer T1，Described No. 7 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM2 being cascaded and the coil of A.C. contactor KM4，Described No. 8 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM1 being cascaded and the coil of A.C. contactor KM3，Described No. 9 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM3 being cascaded and the coil of A.C. contactor KM1，Described No. 10 terminals are connected with the foot 2 of fuse F1 by the coil of A.C. contactor KM6，Described No. 11 terminals are connected with the foot 2 of fuse F1 by the coil of A.C. contactor KM5，Described No. 12 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM4 being cascaded and the coil of A.C. contactor KM2，Described 15～No. 16 terminals connect starting state display lamp input，Described 18～No. 19 terminals connect malfunction display lamp input，Described No. 21 terminals connect emergency stop button switch amount signal，Described No. 22 terminals connect hydropenia on-off model，Described No. 23 terminals connect frequency converter failure on-off model，Described No. 24 terminals connect oil point device on-off model，Described No. 25 terminals connect air filter on-off model，Described No. 26 terminals connect remote switch on-off model，Described 30～No. 31 terminals connect temperature sensor outfan，Described 32～No. 34 terminals connect the control end of air switch CT1，Described 35～No. 37 terminals connect the control end of air switch CT2，The outfan of described 38～No. 39 terminals Bonding pressure sensor P1，The foot 1 of the converter fuse F1 foot 3 by button S1 connection transformer T1，The foot 1 of transformator T1 is electric by the fuse F2 A phase connecting 380V alternating current power supply，The foot 2 of transformator T1 is electric by the fuse F3 C phase connecting 380V alternating current power supply，The three-phase electricity input of blower fan connects 380V alternating current power supply by the main contacts of A.C. contactor KM5，The A phase electricity input circuit of blower fan and B are in series with air switch CT1 in electricity input circuit，The three-phase electricity input of air compressor machine M1 connects the outfan of converter U1 by the main contacts of A.C. contactor KM2，The input of converter U1 connects 380V alternating current power supply，The three-phase electricity input of described air compressor machine M1 connects 380V alternating current power supply also by A.C. contactor KM4，The A phase main contacts input circuit of A.C. contactor KM4 and B phase main contacts input circuit are in series with air switch CT2，The three-phase electricity input of described air compressor machine M1 is also by the three-phase electricity outfan of the main contacts described air compressor machine M1 of connection of A.C. contactor KM1，The three-phase electricity outfan of described air compressor machine M1 connects a common point A also by the main contacts of A.C. contactor KM3.
3 feet of described transformator T1 and 4 foot output AC 220V power supplys, 5 feet of described transformator T1 and 6 foot output AC 24V power supplys.
Described touch screen module is welded on the back side of described air compressor controller U2.
A kind of obfuscation controls the method for screw air compressor, comprises the following steps:
Step 1: measure the air pressure value e of air compressor machine output, then calculate the error of pressure and the rate of change Δ e of error；
Step 2: the rate of change Δ e value of error is set as linguistic variable value: { NB, NM, NS, ZO, PS, PM, PB}；Air pressure value e value is set as linguistic variable value: { NB, NM, NS, ZO, PS, PM, PB}；Controlled quentity controlled variable u1 output valve is set as linguistic variable value: { ZO, VS, PS, PM, PB, VB}；
Step 3: table look-up according to fuzzy control table and draw controlled quentity controlled variable u1 output valve；
When the rate of change Δ e value of error is that { during NB}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NB, NB, NM, NM, NS, Z, Z}；
When the rate of change Δ e value of error is that { during NM}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NB, NM, NM, NS, NS, Z, PS}；
When the rate of change Δ e value of error is that { during NS}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NM, NM, NS, NS, Z, PS, PS}；
When the rate of change Δ e value of error is that { during ZO}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NM, NM, NS, ZO, PS, PS, PM}；
When the rate of change Δ e value of error is that { during PS}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NS, NS, Z, PS, PS, PM, PM}；
When the rate of change Δ e value of error is that { during PM}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NS, ZO, PS, PS, PM, PM, PB}；
When the rate of change Δ e value of error is that { during PB}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { ZO, ZO, PS, PM, PM, PB, PB}；
Step 4: carry out fuzzy switching according to controlled quentity controlled variable u1 output valve: when controlled quentity controlled variable u1 output valve is ZO or VS, calculate output according to PID mode, when controlled quentity controlled variable u1 output valve is PS, PM or PB, calculates output according to membership function.
The rate of change Δ e value of described error is set as linguistic variable value: NB, NM, NS, ZO, PS, PM, PB}, represent successively negative big, in negative, negative little, zero, just little, center, just }.
Described controlled quentity controlled variable u1 output valve is set as linguistic variable value: ZO, VS, PS, PM, PB, VB}, represent successively zero, only small, little, in, greatly, very greatly }.
Described air pressure value e value is set as linguistic variable value: NB, NM, NS, ZO, PS, PM, PB}, represent successively negative big, in negative, negative little, zero, just little, center, just }.
A kind of obfuscation of the present invention controls the controller of screw air compressor, employing obfuscation controls, air compressor machine can be allowed to switch in power frequency, VFC mode, merged the advantage of existing two kinds of types, solved power frequency machine not energy-conservation, the problem that frequency changer is unstable, man machine interface adopts touch screen, user-friendly, for existing frequency changer mair motor control mode, optimizing, power consumption is lower.The present invention adds FUZZY ALGORITHMS FOR CONTROL on the basis of original pid control algolithm, makes pneumatics function be rapidly achieved pressure constant state, makes pressure more accurate, and fluctuation range is lower；Adopting the touch screen of 7 cun, man machine interface is more friendly；Controlling part and display part is made of one machine, take up room less, cost is low；The switching of power frequency and VFC mode can be carried out, both can be energy-conservation, can ensure that again the stability of air compressor machine；Adopt different Loading Control modes, rapid starting/stopping air compressor machine, it is possible to when air compressor machine unloads, cut off by motor, more energy efficient；Improve pid control mode, faster reach pressure constant state.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
Embodiment 1:
nullA kind of obfuscation as shown in Figure 1 controls the controller of screw air compressor，Including air compressor controller U2U2、Transformator T1、A.C. contactor KM1、A.C. contactor KM2、A.C. contactor KM3、A.C. contactor KM4、A.C. contactor KM5、A.C. contactor KM6、Air switch CT1、Air switch CT2、Fuse F1、Fuse F2、Fuse F3、Temperature sensor R1、Pressure transducer P1、Button S1、Converter U1、Blower fan M2 and air compressor machine M1，Described air compressor controller U2 includes touch screen module、1～No. 40 terminals、First serial and second serial，Described first serial connects the communication ends of converter，Touch screen module electrically connects with described air compressor controller U2，Described 1～No. 3 terminals connect 380V alternating current power supply，Described 4～No. 5 terminals connect 24V alternating current power supply，The foot 4 of described No. 6 terminals connection transformer T1，Described No. 7 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM2 being cascaded and the coil of A.C. contactor KM4，Described No. 8 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM1 being cascaded and the coil of A.C. contactor KM3，Described No. 9 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM3 being cascaded and the coil of A.C. contactor KM1，Described No. 10 terminals are connected with the foot 2 of fuse F1 by the coil of A.C. contactor KM6，Described No. 11 terminals are connected with the foot 2 of fuse F1 by the coil of A.C. contactor KM5，Described No. 12 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM4 being cascaded and the coil of A.C. contactor KM2，Described 15～No. 16 terminals connect starting state display lamp input，Described 18～No. 19 terminals connect malfunction display lamp input，Described No. 21 terminals connect emergency stop button switch amount signal，Described No. 22 terminals connect hydropenia on-off model，Described No. 23 terminals connect frequency converter failure on-off model，Described No. 24 terminals connect oil point device on-off model，Described No. 25 terminals connect air filter on-off model，Described No. 26 terminals connect remote switch on-off model，Described 30～No. 31 terminals connect temperature sensor outfan，Described 32～No. 34 terminals connect the control end of air switch CT1，Described 35～No. 37 terminals connect the control end of air switch CT2，The outfan of described 38～No. 39 terminals Bonding pressure sensor P1，The foot 1 of the converter fuse F1 foot 3 by button S1 connection transformer T1，The foot 1 of transformator T1 is electric by the fuse F2 A phase connecting 380V alternating current power supply，The foot 2 of transformator T1 is electric by the fuse F3 C phase connecting 380V alternating current power supply，The three-phase electricity input of blower fan connects 380V alternating current power supply by the main contacts of A.C. contactor KM5，The A phase electricity input circuit of blower fan and B are in series with air switch CT1 in electricity input circuit，The three-phase electricity input of air compressor machine M1 connects the outfan of converter U1 by the main contacts of A.C. contactor KM2，The input of converter U1 connects 380V alternating current power supply，The three-phase electricity input of described air compressor machine M1 connects 380V alternating current power supply also by A.C. contactor KM4，The A phase main contacts input circuit of A.C. contactor KM4 and B phase main contacts input circuit are in series with air switch CT2，The three-phase electricity input of described air compressor machine M1 is also by the three-phase electricity outfan of the main contacts described air compressor machine M1 of connection of A.C. contactor KM1，The three-phase electricity outfan of described air compressor machine M1 connects a common point A also by the main contacts of A.C. contactor KM3.
3 feet of described transformator T1 and 4 foot output AC 220V power supplys, 5 feet of described transformator T1 and 6 foot output AC 24V power supplys.
Described touch screen module is welded on the back side of described air compressor controller U2.
Air compressor controller opens the amount of changing information from what 21～No. 27 terminals gathered the relevant sensor of air compressor machines, for judging and control the ruuning situation of air compressor machine；
Air compressor controller is from the information of 30～No. 31 terminals collecting temperature sensors, and gathering pressure sensor information from 38～No. 39 terminals, air compressor controller participates in during fuzzy control calculates after the information of described temperature sensor and pressure sensor information being processed.
Air compressor controller controls A.C. contactor KM1, A.C. contactor KM2, A.C. contactor KM3, A.C. contactor KM4, A.C. contactor KM5 and A.C. contactor KM6 (charge valve) by 6～No. 12 terminals, realize the switching between air compressor machine converting operation and power frequency operation, when being switched to converting operation, KM2 closes, KM4 disconnects, KM1 closes, KM3 disconnects, when being switched to power frequency operation, KM4, KM3 Guan Bi during startup, motor star connection is run, after time delay, KM3 disconnects, and KM1 closes, and motor turns delta connection and runs；A2, B2 are connected with converter 485 communication terminal, control converter by the mode communicated and run.
The Machine Design of existing air compressor machine, after air compressor machine is shut down, owing to can there be the gas of high pressure in gs-oil separator, therefore can not start at once.Existing air compressor controller adopts the mode of time delay, waits the time set, and the pressure in gs-oil separator restarts air compressor machine after reducing.The some time such as this mode user's needs, and set of time is improper, also results in air compressor machine and breaks down.For this problem, this programme changes existing control mode, first charge valve is opened, mair motor is allowed to run to lower frequency limit, accelerate the earth pressure release in gs-oil separator, when mair motor runs to lower frequency limit, enough torques can be had, at this moment closing charge valve, air compressor machine starts aerogenesis.In this way, the response speed of air compressor machine is accelerated.
In traditional air compressor machine control mode, during air compressor machine unloading, motor must start always, and frequency generally wants more than 20Hz, otherwise can be not normally functioning because of the hypertonia in gs-oil separator, cause that overload fault jumped by converter, after adopting above-mentioned control mode, can being cut off by mair motor when air compressor machine unloads, energy-saving effect significantly improves.
The control part of air compressor controller and display part, be made of one machine.Front operation display interface, the back side connects control line and power line.There are three buttons in controller front, respectively startup, stopping, sudden-stop function.
Embodiment 2:
Control the method that the obfuscation of the controller of screw air compressor controls screw air compressor based on a kind of obfuscation described in embodiment 1, the method is to be controlled the controller realization of screw air compressor by a kind of obfuscation described in embodiment 1, and it comprises the following steps:
Step 1: measure the air pressure value e of air compressor machine output, then calculate the error of pressure and the rate of change Δ e of error；
Step 2: the rate of change Δ e value of error is set as linguistic variable value: { NB, NM, NS, ZO, PS, PM, PB}；Air pressure value e value is set as linguistic variable value: { NB, NM, NS, ZO, PS, PM, PB}；Controlled quentity controlled variable u1 output valve is set as linguistic variable value: { ZO, VS, PS, PM, PB, VB}；
Step 3: table look-up according to fuzzy control table and draw controlled quentity controlled variable u1 output valve；
When the rate of change Δ e value of error is that { during NB}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NB, NB, NM, NM, NS, Z, Z}；
When the rate of change Δ e value of error is that { during NM}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NB, NM, NM, NS, NS, Z, PS}；
When the rate of change Δ e value of error is that { during NS}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NM, NM, NS, NS, Z, PS, PS}；
When the rate of change Δ e value of error is that { during ZO}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NM, NM, NS, ZO, PS, PS, PM}；
When the rate of change Δ e value of error is that { during PS}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NS, NS, Z, PS, PS, PM, PM}；
When the rate of change Δ e value of error is that { during PM}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NS, ZO, PS, PS, PM, PM, PB}；
When the rate of change Δ e value of error is that { during PB}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { ZO, ZO, PS, PM, PM, PB, PB}；
Namely the rate of change Δ e of error, relation between controlled quentity controlled variable u1 output valve and air pressure value e are as shown in the table:
Step 4: carry out fuzzy switching according to controlled quentity controlled variable u1 output valve: when controlled quentity controlled variable u1 output valve is ZO or VS, calculate output according to PID mode, when controlled quentity controlled variable u1 output valve is PS, PM or PB, calculates output according to membership function.
The rate of change Δ e value of described error is set as linguistic variable value: NB, NM, NS, ZO, PS, PM, PB}, represent successively negative big, in negative, negative little, zero, just little, center, just }.
Described controlled quentity controlled variable u1 output valve is set as linguistic variable value: ZO, VS, PS, PM, PB, VB}, represent successively zero, only small, little, in, greatly, very greatly }.
Described air pressure value e value is set as linguistic variable value: NB, NM, NS, ZO, PS, PM, PB}, represent successively negative big, in negative, negative little, zero, just little, center, just }.
Claims (7)
- null1. the controller of an obfuscation control screw air compressor，It is characterized in that: include air compressor controller U2、Transformator T1、A.C. contactor KM1、A.C. contactor KM2、A.C. contactor KM3、A.C. contactor KM4、A.C. contactor KM5、A.C. contactor KM6、Air switch CT1、Air switch CT2、Fuse F1、Fuse F2、Fuse F3、Temperature sensor R1、Pressure transducer P1、Button S1、Converter U1、Blower fan M2 and air compressor machine M1，Described air compressor controller U2 includes touch screen module、1～No. 40 terminals、First serial and second serial，Described first serial connects the communication ends of converter，Touch screen module electrically connects with described air compressor controller U2，Described 1～No. 3 terminals connect 380V alternating current power supply，Described 4～No. 5 terminals connect 24V alternating current power supply，The foot 4 of described No. 6 terminals connection transformer T1，Described No. 7 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM2 being cascaded and the coil of A.C. contactor KM4，Described No. 8 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM1 being cascaded and the coil of A.C. contactor KM3，Described No. 9 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM3 being cascaded and the coil of A.C. contactor KM1，Described No. 10 terminals are connected with the foot 2 of fuse F1 by the coil of A.C. contactor KM6，Described No. 11 terminals are connected with the foot 2 of fuse F1 by the coil of A.C. contactor KM5，Described No. 12 terminals connect 2 feet of fuse F1 by the normally closed auxiliary contact of A.C. contactor KM4 being cascaded and the coil of A.C. contactor KM2，Described 15～No. 16 terminals connect starting state display lamp input，Described 18～No. 19 terminals connect malfunction display lamp input，Described No. 21 terminals connect emergency stop button switch amount signal，Described No. 22 terminals connect hydropenia on-off model，Described No. 23 terminals connect frequency converter failure on-off model，Described No. 24 terminals connect oil point device on-off model，Described No. 25 terminals connect air filter on-off model，Described No. 26 terminals connect remote switch on-off model，Described 30～No. 31 terminals connect temperature sensor outfan，Described 32～No. 34 terminals connect the control end of air switch CT1，Described 35～No. 37 terminals connect the control end of air switch CT2，The outfan of described 38～No. 39 terminals Bonding pressure sensor P1，The foot 1 of the converter fuse F1 foot 3 by button S1 connection transformer T1，The foot 1 of transformator T1 is electric by the fuse F2 A phase connecting 380V alternating current power supply，The foot 2 of transformator T1 is electric by the fuse F3 C phase connecting 380V alternating current power supply，The three-phase electricity input of blower fan connects 380V alternating current power supply by the main contacts of A.C. contactor KM5，The A phase electricity input circuit of blower fan and B are in series with air switch CT1 in electricity input circuit，The three-phase electricity input of air compressor machine M1 connects the outfan of converter U1 by the main contacts of A.C. contactor KM2，The input of converter U1 connects 380V alternating current power supply，The three-phase electricity input of described air compressor machine M1 connects 380V alternating current power supply also by A.C. contactor KM4，The A phase main contacts input circuit of A.C. contactor KM4 and B phase main contacts input circuit are in series with air switch CT2，The three-phase electricity input of described air compressor machine M1 is also by the three-phase electricity outfan of the main contacts described air compressor machine M1 of connection of A.C. contactor KM1，The three-phase electricity outfan of described air compressor machine M1 connects a common point A also by the main contacts of A.C. contactor KM3.
- 2. a kind of obfuscation as claimed in claim 1 controls the controller of screw air compressor, it is characterised in that: 3 feet of described transformator T1 and 4 foot output AC 220V power supplys, 5 feet of described transformator T1 and 6 foot output AC 24V power supplys.
- 3. a kind of obfuscation as claimed in claim 1 controls the controller of screw air compressor, it is characterised in that: described touch screen module is welded on the back side of described air compressor controller U2.
- 4. the method that the obfuscation of the controller of screw air compressor controls screw air compressor is controlled based on a kind of obfuscation described in power 1, it is characterised in that: comprise the following steps:Step 1: measure the air pressure value e of air compressor machine output, then calculate the error of pressure and the rate of change Δ e of error；Step 2: the rate of change Δ e value of error is set as linguistic variable value: { NB, NM, NS, ZO, PS, PM, PB}；Air pressure value e value is set as linguistic variable value: { NB, NM, NS, ZO, PS, PM, PB}；Controlled quentity controlled variable u1 output valve is set as linguistic variable value: { ZO, VS, PS, PM, PB, VB}；Step 3: table look-up according to fuzzy control table and draw controlled quentity controlled variable u1 output valve；When the rate of change Δ e value of error is that { during NB}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NB, NB, NM, NM, NS, Z, Z}；When the rate of change Δ e value of error is that { during NM}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NB, NM, NM, NS, NS, Z, PS}；When the rate of change Δ e value of error is that { during NS}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NM, NM, NS, NS, Z, PS, PS}；When the rate of change Δ e value of error is that { during ZO}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NM, NM, NS, ZO, PS, PS, PM}；When the rate of change Δ e value of error is that { during PS}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NS, NS, Z, PS, PS, PM, PM}；When the rate of change Δ e value of error is that { during PM}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { NS, ZO, PS, PS, PM, PM, PB}；When the rate of change Δ e value of error is that { during PB}, air pressure value e obtains value for { NB, NM, NS, ZO, PS, PM, PB} correspondence controlled quentity controlled variable u1 output valve { ZO, ZO, PS, PM, PM, PB, PB}；Step 4: carry out fuzzy switching according to controlled quentity controlled variable u1 output valve: when controlled quentity controlled variable u1 output valve is ZO or VS, calculate output according to PID mode, when controlled quentity controlled variable u1 output valve is PS, PM or PB, calculates output according to membership function.
- 5. the method that a kind of obfuscation as claimed in claim 4 controls screw air compressor, it is characterised in that: the rate of change Δ e value of described error is set as linguistic variable value: { NB, NM, NS, ZO, PS, PM, PB}, represent successively negative big, in negative, negative little, zero, just little, center, just }.
- 6. the method that a kind of obfuscation as claimed in claim 4 controls screw air compressor, it is characterised in that: described controlled quentity controlled variable u1 output valve is set as linguistic variable value: ZO, VS, PS, PM, PB, VB}, represent successively zero, only small, little, in, greatly, very greatly }.
- 7. the method that a kind of obfuscation as claimed in claim 4 controls screw air compressor, it is characterised in that: described air pressure value e value is set as linguistic variable value: { NB, NM, NS, ZO, PS, PM, PB}, represent successively negative big, in negative, negative little, zero, just little, center, just }.
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| CN105782047B (en) | 2019-02-12 |
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