CN102393631A - Lubricating oil temperature control system based on fuzzy control - Google Patents
Lubricating oil temperature control system based on fuzzy control Download PDFInfo
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- CN102393631A CN102393631A CN2011103144881A CN201110314488A CN102393631A CN 102393631 A CN102393631 A CN 102393631A CN 2011103144881 A CN2011103144881 A CN 2011103144881A CN 201110314488 A CN201110314488 A CN 201110314488A CN 102393631 A CN102393631 A CN 102393631A
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Abstract
A lubricating oil temperature control system based on fuzzy control comprises the following steps of defining variable quantity, blurring, inquiring a knowledge base, conducting logic judgment, and eliminating fuzzification, and is realized in the way that P.I.D parameters of a PID (Proportion Integration Differentiation) adjuster are ensured, simultaneously, the delay time, namely the time for lubricating oil to flow to a TT4 temperature measuring point from a TT3 temperature measuring point, of a system is watched, and delay time T1 is memorized by the system; and a fuzzy control system is established, the temperature at the TT4 temperature measuring point is sampled and is compared with a target value, and the PID are adjusted by taking new set values as targets and then are judged and controlled according to an original method after the T1 time period until the TT4 temperature measuring point reaches a target control temperature. The lubricating oil temperature control system has the beneficial effects of greatly enhancing the lubricating oil temperature control precision and system stability, improving the adaptability and the external environment interference resistance of the system, and shortening the time for live debugging, thereby proving lubricating oil with a constant temperature for needed equipment.
Description
Technical field:
The present invention relates to lubricating oil temperature control technology field, particularly relate to lubricating oil temperature control system based on fuzzy control.
Background technology:
The plant equipment of some large-scale high-precisions; Lubricating oil all there is very high requirement; This wherein not only has very high requirement to indexs such as the kind of lubricating oil, viscosity, cleanliness factors; And lubricated temperature also had high requirement, promptly lubricating oil temperature will be controlled in the scope of desired value ± 0.5 ℃ even be higher; And the grease-box capacity is big in the lubrication station, usually more than 10 tons, and the fuel tank internal heater; Make that lubricating oil temperature is controlled between 43 ℃～49 ℃ in the fuel tank, and lubricating oil at first to pass through cooling sea water regulating valve after coming out from fuel tank, get into accumulator then; Also have a segment distance from the accumulator back of coming out to lubricated equipment, and cooling sea water regulating valve is in the grease-box exit, lubricating oil is from the fuel tank to equipment; Generally need about 2 to 3 minutes time, its whole lubricating system structure is as shown in Figure 1: the TT3 point for measuring temperature is behind cooling sea water regulating valve, before the accumulator, and lubrication station is inner; The TT4 point for measuring temperature is at lubricated power lubrication entrance place, outside lubrication station.So whole lubricating system is a Large-lag System, and the lubricating oil that finally supplies on the equipment influences by several factors, like the temperature fluctuation of lubricating oil fuel tank; Plant equipment starts/stops influence, and its flow of lubrication can change; Its liquid level of liquid level control of accumulator can change, and its delay degree also can be affected; In addition, also receive factor affecting such as cooling water inlet temperature variation and variation of ambient temperature.
Summary of the invention:
The object of the invention is exactly the shortcoming that overcomes prior art; Adopt the thought of fuzzy control; A kind of lubricating oil temperature control system based on fuzzy control is provided, large-scale high-precision plant equipment lubrication oil supply temperature is accurately controlled, the lubricating oil of temperature constant is provided for equipment needed thereby.
The present invention solves the scheme that its technical matters adopts: a kind of lubricating oil temperature control system based on fuzzy control is provided, it is characterized in that: may further comprise the steps: a, defining variable; B, obfuscation; C, knowledge base; D, logic determines; E, defuzzification; Wherein a, defining variable: TT3 adjustment circuit system standard P ID regulator parameter P, I, D; Cooling sea water regulating valve exit monitoring temperature value TT3; Lubricated machine oil temperature in monitored value TT4; The TT4 value is used as the value of feedback PV of PID regulator; Lubricating oil flows to the required time T of TT4 point for measuring temperature 1 by the TT3 point for measuring temperature; Chilled water modulation loop PID regulator set-point SP; Chilled water modulation loop PID regulator output LMN; PID regulator set-point SP increases (subtracting) amplitude Δ t; B, obfuscation: the TT3 temperature spot is carried out in the thermoregulator process through regulating cooling sea water regulating valve in the PID system, if the adjusting time be no more than T1, then in whole adjustment process; Control system is indifferent to TT4 temperature value this moment, behind elapsed time T1, has got access to new temperature at the TT4 point for measuring temperature, and value that system just will sample this moment and the desired value of TT4 compare; After having contrasted, determine whether will revise the setting value of PID regulator more again, if the temperature value that TT4 samples is in the target control value scope; Then the set-point of PID regulator is constant; System still regulates according to setting value before, after the time period, reexamines the temperature value of TT4 through T1; In the whole control process; System is indifferent to the temperature gap between TT3 and the TT4, and just is concerned about its variation tendency, and the setting value of PID regulator and the desired value of TT4 do not have concrete linear relationship yet; C, knowledge base: after the lubricating oil of lubricating system comes out from fuel tank,, get into energy storage tank through behind the cooling sea water regulating valve; Come lubricating oil is suppressed; Just use through pipeline transportation to plant equipment afterwards, receive factor affecting such as liquid level in the accumulator jar, environment temperature and plant equipment working time, be difficult to find the absolute function relational expression of TT3 point for measuring temperature and TT4 point for measuring temperature temperature variation; And just know a variation tendency; Be that TT3 point for measuring temperature oil temperature uprises, elapsed time T1, the temperature of TT4 point for measuring temperature also can uprise; Otherwise the warm step-down of TT3 point for measuring temperature oil, elapsed time T1, the oily temperature of TT4 point for measuring temperature also can step-down; D, logic determines: regulating system is being passed through T1 after the time period; Lubricating oil after promptly the regulating TT4 point for measuring temperature of having flowed through; This moment, temperature signal and the desired value with the collection of TT4 point for measuring temperature compared; If the temperature that TT4 collects is higher than desired value, explain promptly that also the temperature value of TT3 is higher, the PID setting value should suitably be reduced; If the temperature that TT4 collects is lower than desired value, explain promptly that also the temperature value of TT3 is lower, then the PID setting value should suitably raise; Fuzzy concept when mimic human judges, utilization fuzzy logic and fuzzy deduction method are carried out inference, and obtain the fuzzy control signal, and this part is the marrow place of fuzzy controller; E, defuzzification: according to logic determines before, if through behind the regulating cycle T1, the TT4 temperature is higher than its desired value, and then the PID setting value SP with TT3 adjustment loop reduces promptly new SP
N+1=SP
n-Δ t, on the contrary then the PID setting value SP with TT3 adjustment loop raises promptly new SP
N+1=SP
n+ Δ t; Convert the resulting fuzzy value of inference into clear and definite controlling signal, as the input value of system; Native system is accomplished by a cover PLC system, and the temperature acquisition template through PLC collects the PLC system with temperature required value; Control the opening degree of cooling sea water regulating valve simultaneously through analog quantity output template output 4～20mA current signal of PLC; Concrete implementation method is: at first, the P of the PID regulator that settles the standard, I, D parameter are set a temperature to the TT3 point for measuring temperature earlier; Using standard P ID regulator that cooling sea water regulating valve is controlled regulates setting value; Make it reach stable regulating effect, so far, P, I, D parameter are confirmed to finish; In the PID regulator parameter that settles the standard, note T1 retardation time of observing system, promptly lubricating oil flow to time of TT4 point for measuring temperature from the TT3 point for measuring temperature, and system writes down this retardation time of T1; Set up Fuzzy control system, the TT3 point for measuring temperature is set an initial desired temperature SP
1, the PID regulator is a target with this value, regulates, and, the temperature of TT4 point for measuring temperature is sampled, and carry out with desired value after the time period through T1, is higher than desired value like the TT4 actual value, then control system is with PID setting value SP
1Again assignment, i.e. SP
2=SP
1-Δ t; Be lower than desired value like the TT4 actual value, then control system is with PID setting value SP assignment, i.e. SP again
2=SP
1+ Δ t; PID is a target with new setting value, regulate, through T1 after the time period, again according to before method judge and control, reach the target control temperature up to the TT4 point for measuring temperature; So far, system gets into steady state (SS), but system can monitor the temperature variation of TT4 always, if the TT4 temperature exceeds its target zone value, then Fuzzy control system can restart, and regulates again, till system reaches new stable state.
The invention has the beneficial effects as follows: the lubricating oil temperature control system that adopts the present invention's design; With originally complicated, that be subject to extraneous changing factor influence, be difficult to adopt the thought of fuzzy control to handle with the temperature variation relation of mathematical function relationship or expression formula explanation; Thereby broken away from the lubricating system poor stability, and be subject to the shortcoming that other condition is disturbed; System of the present invention can greatly improve lubricating oil temperature control accuracy and system stability, and greatly improves the adaptability and the anti-external environmental interference property of system, has shortened the field adjustable time widely, and the lubricating oil of temperature constant is provided for equipment needed thereby.
Description of drawings:
Fig. 1 is a lubrication system architecture synoptic diagram of the prior art;
Fig. 2 is the embodiment of the invention " based on the lubricating oil temperature control system of a fuzzy control " block diagram;
In the accompanying drawing 1: 1. oil conditioner fuel feeding; 2. well heater; 3. oil conditioner oil return; 4. fuel tank; 5. return pressure transmitter; 6. main oil return opening; 7. oily temperature transmitter; 8. liquid level gauge; 9. lubricated plant equipment; 10. charge oil pressure transmitter; 11. temperature transmitter TT4; 12. charge oil pressure variable valve; 13. be connected to the pipeline outside the lubrication station; 14. level switch; 15. energy storage tank; 16. energy storage pressure; 17. compressed air inlet; 18. temperature transmitter TT3; 19. cooling water inlet; 20. coolant outlet; 21. cooling sea water regulating valve; 22. the fuel feeding plugged filter detects; 23.3# main pump; 24.2# main pump; 25.1# main pump; 26.3 number oil sucting valve; 27.2 number oil sucting valve; 28.1 oil sucting valve; 29. main oil-in.
In the accompanying drawing 2: the PID regulator is the abbreviation of PID regulator, and wherein P is a ratio, and I is an integration, and D is a differential, is the algorithm of a mathematics; The value of feedback of PV:PID (also claiming process variable) is writing a Chinese character in simplified form of Process value; The set-point of SP:PID is writing a Chinese character in simplified form of Set point; LMN: be PID regulator output valve, LMN is the abbreviation of PID regulator output among the Siemens PLC C; TT4: be lubricated machine oil temperature in monitored value; TT3: cooling sea water regulating valve exit monitoring temperature value; T1: lubricating oil flow to the time of TT4 point for measuring temperature from the TT3 point for measuring temperature; Δ t:PID regulator set-point SP increases (subtracting) amplitude Δ t; SP
N+1It is the set-point of next PID; SP
nIt is the set-point of this PID.
Embodiment:
Below in conjunction with accompanying drawing the embodiment of the invention " based on the lubricating oil temperature control system of fuzzy control " being made further explain: Fig. 1 is lubrication system architecture synoptic diagram in the prior art, mainly by fuel tank 4, and oil conditioner fuel feeding 1; Well heater 2; Oil conditioner oil return 3; Return pressure transmitter 5; Main oil return opening 6; The warm transmitter 7 of oil; Liquid level gauge 8; Lubricated plant equipment 9; Charge oil pressure transmitter 10; Temperature transmitter TT4 11; Charge oil pressure variable valve 12; Be connected to the pipeline 13 outside the lubrication station; Level switch 14; Energy storage tank 15; Energy storage pressure 16; Compressed air inlet 17; Temperature transmitter TT3 18; Cooling water inlet 19; Coolant outlet 20; Cooling sea water regulating valve 21; The fuel feeding plugged filter detects 22; 3# main pump 23; 2# main pump 24; 1# main pump 25; No. 3 oil sucting valves 26; No. 2 oil sucting valves 27; No. 1 oil sucting valve 28; Main oil-in 29 is formed; " based on the lubricating oil temperature control system of fuzzy control " of the present invention embodiment is the oily temperature control system of on the lubrication system architecture basis of existing lubricating oil, being accomplished by a cover PLC system, and as shown in Figure 2: the temperature acquisition template through PLC collects the PLC system with temperature required value; 4～the 20mA of analog quantity output template through PLC output simultaneously current signal controls that the opening degree of cooling sea water regulating valve realizes.The present invention includes following steps: a, defining variable; B, obfuscation; C, knowledge base; D, logic determines; E, defuzzification; Its specific practice is: at first, and the P of the PID regulator that settles the standard, I, D parameter.Earlier the TT3 point for measuring temperature is set a temperature, use standard P ID regulator that cooling sea water regulating valve is controlled setting value is regulated, make it reach stable regulating effect, so far, P, I, D parameter are confirmed to finish.In the PID regulator parameter that settles the standard, note the retardation time of observing system, promptly lubricating oil flow to time of TT4 point for measuring temperature from the TT3 point for measuring temperature, and system writes down this retardation time of T1.Set up Fuzzy control system, the TT3 point for measuring temperature is set an initial desired temperature SP
1, the PID regulator is a target with this value, regulates, and, the temperature of TT4 point for measuring temperature is sampled, and carry out with desired value after the time period through T1, is higher than desired value like the TT4 actual value, then control system is with PID setting value SP
1Again assignment, i.e. SP
2=SP
1-Δ t; Be lower than desired value like the TT4 actual value, then control system is with PID setting value SP assignment, i.e. SP again
2=SP
1+ Δ t; PID is a target with new setting value, regulate, through T1 after the time period, again according to before method judge and control, reach the target control temperature up to the TT4 point for measuring temperature.So far, system gets into steady state (SS), but system can monitor the temperature variation of TT4 always, if the TT4 temperature exceeds its target zone value, then Fuzzy control system can restart, and regulates again, till system reaches new stable state.
Claims (1)
1. a kind of lubricating oil temperature control system based on fuzzy control is provided, it is characterized in that: may further comprise the steps: a, defining variable; B, obfuscation; C, knowledge base; D, logic determines; E, defuzzification; Wherein a, defining variable: TT3 adjustment circuit system standard P ID regulator parameter P, I, D; Cooling sea water regulating valve exit monitoring temperature value TT3; Lubricated machine oil temperature in monitored value TT4; The TT4 value is used as the value of feedback PV of PID regulator; Lubricating oil flows to the required time T of TT4 point for measuring temperature 1 by the TT3 point for measuring temperature; Chilled water modulation loop PID regulator set-point SP; Chilled water modulation loop PID regulator output LMN; PID regulator set-point SP increases (subtracting) amplitude Δ t; B, obfuscation: the TT3 temperature spot is carried out in the thermoregulator process through regulating cooling sea water regulating valve in the PID system, if the adjusting time be no more than T1, then in whole adjustment process; Control system is indifferent to TT4 temperature value this moment, behind elapsed time T1, has got access to new temperature at the TT4 point for measuring temperature, and value that system just will sample this moment and the desired value of TT4 compare; After having contrasted, determine whether will revise the setting value of PID regulator more again, if the temperature value that TT4 samples is in the target control value scope; Then the set-point of PID regulator is constant; System still regulates according to setting value before, after the time period, reexamines the temperature value of TT4 through T1; In the whole control process; System is indifferent to the temperature gap between TT3 and the TT4, and just is concerned about its variation tendency, and the setting value of PID regulator and the desired value of TT4 do not have concrete linear relationship yet; C, knowledge base: after the lubricating oil of lubricating system comes out from fuel tank,, get into energy storage tank through behind the cooling sea water regulating valve; Come lubricating oil is suppressed; Just use through pipeline transportation to plant equipment afterwards, receive factor affecting such as liquid level in the accumulator jar, environment temperature and plant equipment working time, be difficult to find the absolute function relational expression of TT3 point for measuring temperature and TT4 point for measuring temperature temperature variation; And just know a variation tendency; Be that TT3 point for measuring temperature oil temperature uprises, elapsed time T1, the temperature of TT4 point for measuring temperature also can uprise; Otherwise the warm step-down of TT3 point for measuring temperature oil, elapsed time T1, the oily temperature of TT4 point for measuring temperature also can step-down; D, logic determines: regulating system is being passed through T1 after the time period; Lubricating oil after promptly the regulating TT4 point for measuring temperature of having flowed through; This moment, temperature signal and the desired value with the collection of TT4 point for measuring temperature compared; If the temperature that TT4 collects is higher than desired value, explain promptly that also the temperature value of TT3 is higher, the PID setting value should suitably be reduced; If the temperature that TT4 collects is lower than desired value, explain promptly that also the temperature value of TT3 is lower, then the PID setting value should suitably raise; Fuzzy concept when mimic human judges, utilization fuzzy logic and fuzzy deduction method are carried out inference, and obtain the fuzzy control signal, and this part is the marrow place of fuzzy controller; E, defuzzification: according to logic determines before, if through behind the regulating cycle T1, the TT4 temperature is higher than its desired value, and then the PID setting value SP with TT3 adjustment loop reduces promptly new SP
N+1=SP
n-Δ t, on the contrary then the PID setting value SP with TT3 adjustment loop raises promptly new SP
N+1=SP
n+ Δ t; Convert the resulting fuzzy value of inference into clear and definite controlling signal, as the input value of system; Native system is accomplished by a cover PLC system, and the temperature acquisition template through PLC collects the PLC system with temperature required value; Control the opening degree of cooling sea water regulating valve simultaneously through analog quantity output template output 4～20mA current signal of PLC; Concrete implementation method is: at first, the P of the PID regulator that settles the standard, I, D parameter are set a temperature to the TT3 point for measuring temperature earlier; Using standard P ID regulator that cooling sea water regulating valve is controlled regulates setting value; Make it reach stable regulating effect, so far, P, I, D parameter are confirmed to finish; In the PID regulator parameter that settles the standard, note the retardation time of observing system, promptly lubricating oil flow to time of TT4 point for measuring temperature from the TT3 point for measuring temperature, and system writes down this retardation time of T1; Set up Fuzzy control system, the TT3 point for measuring temperature is set an initial desired temperature SP
1, the PID regulator is a target with this value, regulates, and, the temperature of TT4 point for measuring temperature is sampled, and carry out with desired value after the time period through T1, is higher than desired value like the TT4 actual value, then control system is with PID setting value SP
1Again assignment, i.e. SP
2=SP
1-Δ t; Be lower than desired value like the TT4 actual value, then control system is with PID setting value SP assignment, i.e. SP again
2=SP
1+ Δ t; PID is a target with new setting value, regulate, through T1 after the time period, again according to before method judge and control, reach the target control temperature up to the TT4 point for measuring temperature; So far, system gets into steady state (SS), but system can monitor the temperature variation of TT4 always, if the TT4 temperature exceeds its target zone value, then Fuzzy control system can restart, and regulates again, till system reaches new stable state.
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Cited By (3)
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| CN108845490A (en) * | 2018-06-23 | 2018-11-20 | 广东希望高科数字技术有限公司 | A kind of identical tension of Tension Adjustable, which synchronizes, unreels control system |
| CN110314943A (en) * | 2019-08-05 | 2019-10-11 | 山东钢铁股份有限公司 | A kind of cold-rolling emulsion automatic temperature control system and method |
| CN112128602A (en) * | 2020-09-25 | 2020-12-25 | 江苏方天电力技术有限公司 | Lubricating oil temperature control method for large phase modifier capable of inhibiting intermittent internal disturbance |
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