CN102393631B - 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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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 the lubricating oil temperature control system based on fuzzy control.
Background technology:
The plant equipment of some large-scale high-precisions, lubricating oil is had to 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 is also had to high requirement, lubricating oil temperature will be controlled in the scope of desired value ± 0.5 ℃ even higher, and in lubrication station, the grease-box capacity is large, usually more than 10 tons, the fuel tank internal heater, lubricating oil temperature in fuel tank is controlled between 43 ℃ ~ 49 ℃, and at first lubricating oil will pass through cooling sea water regulating valve from fuel tank out, then enter accumulator, also have a segment distance to lubricated equipment from accumulator out, and cooling sea water regulating valve is in the grease-box exit, lubricating oil is from the fuel tank to equipment, generally need the time of about 2 to 3 minutes, its whole lubrication system architecture is as shown in Figure 1: the TT3 point for measuring temperature is after cooling sea water regulating valve, before accumulator, lubrication station inside, 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 finally be supplied on equipment affects by several factors, as the Lubricating oil tank temperature fluctuation; The impact of plant equipment start/stop, its flow of lubrication can change; The liquid level of accumulator is controlled its liquid level and can be changed, and its delay degree also can be affected; In addition, affected by the factors such as cooling water inlet temperature variation and variation of ambient temperature.
Summary of the invention:
Purpose of the present 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, for equipment needed thereby provides the lubricating oil of temperature constant.
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: comprise the following steps: a, defining variable, b, obfuscation, c, knowledge base, d, logic judgement, 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 monitoring 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: in the PID system is carried out thermoregulator process by the adjusting cooling sea water regulating valve to the TT3 temperature spot, if the adjusting time is no more than T1, in whole adjustment process, control system is indifferent to TT4 temperature value this moment, until got new temperature at the TT4 point for measuring temperature after elapsed time T1, now system is just contrasted the value that samples and the desired value of TT4, after having contrasted, again determine whether will revise again the setting value of PID regulator, if the temperature value that TT4 samples is in the target control value scope, the set-point of PID regulator is constant, system is still regulated according to setting value before, through T1 after the time period, reexamine the temperature value of TT4, in whole control procedure, system is indifferent to the temperature gap between TT3 and TT4, and just be concerned about its variation tendency, the setting value of PID regulator and the desired value of TT4 are also without concrete linear relationship, c, knowledge base: the lubricating oil of lubricating system from fuel tank out, after cooling sea water regulating valve, enter energy storage tank, lubricating oil is suppressed, just through piping, being delivered to plant equipment afterwards uses, affected by the factors such as liquid level in the accumulator tank, 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 TT3 point for measuring temperature oil temperature step-down, elapsed time T1, the oil temperature of TT4 point for measuring temperature also can step-down, the judgement of d, logic: regulating system is through T1 after the time period, the TT4 point for measuring temperature of having flowed through of the lubricating oil after regulating, now temperature signal and the desired value of the collection of TT4 point for measuring temperature are contrasted, if the temperature that TT4 collects is higher than desired value, the temperature value that TT3 also is described is higher, and the PID setting value should suitably be lowered, if the temperature that TT4 collects lower than desired value, also illustrates that the temperature value of TT3 is lower, the PID setting value should suitably raise, fuzzy concept when the imitation mankind judge, use fuzzy logic and fuzzy deduction method to carry out inference, and obtain the fuzzy control signal, and this part is the marrow place of fuzzy controller, e, defuzzification: according to logic judgement before, if after a regulating cycle T1, the TT4 temperature, higher than its desired value, is lowered the PID setting value SP in TT3 adjustment loop, i.e. new SP
n+1=SP
n-Δ t, otherwise, the PID setting value SP in TT3 adjustment loop is raised, i.e. new SP
n+1=SP
n+ Δ t, the resulting fuzzy value of inference is converted to clear and definite control signal, as the input value of system, native system is completed by a set of PLC system, and the temperature acquisition template by PLC collects the PLC system by temperature required value, control the opening degree of cooling sea water regulating valve by analog output template output 4～20mA current signal of PLC simultaneously, concrete implementation method is: at first, P, I, the D parameter of PID regulator settle the standard, first the TT3 point for measuring temperature is set to a temperature, Application standard PID regulator is controlled setting value is regulated cooling sea water regulating valve, make it reach stable regulating effect, so far, P, I, D parameter are determined complete, in the PID regulator parameter that settles the standard, note T1 retardation time of observing system, lubricating oil flow to the time of TT4 point for measuring temperature from the TT3 point for measuring temperature, and system is write down this retardation time of T1, set up Fuzzy control system, the TT3 point for measuring temperature is set to an initial desired temperature SP
1, the PID regulator be take this value as target, is regulated, and, after the time period temperature of TT4 point for measuring temperature is sampled through T1, and carries out with desired value, and as the TT4 actual value, higher than desired value, control system is by PID setting value SP
1again assignment, i.e. SP
2=SP
1-Δ t, as the TT4 actual value, lower than desired value, control system is by PID setting value SP assignment, i.e. SP again
2=SP
1+ Δ t, PID be take new setting value as target, is regulated, and through T1 after the time period, then is judged and controls according to method before, until the TT4 point for measuring temperature reaches the target control temperature, so far, system enters steady state (SS), but system can be monitored the temperature variation of TT4 always, if the TT4 temperature exceeds its target zone value, Fuzzy control system can restart, and re-starts adjusting, until 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, adopt the thought of fuzzy control to process the temperature variation relation script complexity, that be subject to extraneous changing factor impact, that be difficult to illustrate by mathematical function relationship or expression formula, 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 adaptability and the anti-external environmental interference of system, has shortened widely the field adjustable time, for equipment needed thereby provides the lubricating oil of temperature constant.
The accompanying drawing explanation:
Fig. 1 is lubrication system architecture schematic diagram of the prior art;
Fig. 2 is the embodiment of the present invention " the lubricating oil temperature control system based on fuzzy control " block diagram;
In 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. oil 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 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 accompanying drawing 2: the PID regulator is the abbreviation of proportional-integral-differential regulator, and wherein P is ratio, and I is integration, and D is 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 in Siemens PLC C; TT4: be lubricated machine oil temperature in monitoring 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 present invention " the lubricating oil temperature control system based on fuzzy control " is described in further detail: Fig. 1 is lubrication system architecture schematic diagram in 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; Oil temperature transmitter 7; Liquid level gauge 8; Lubricated plant equipment 9; Charge oil pressure transmitter 10; Temperature transmitter TT411; Charge oil pressure variable valve 12; Be connected to the pipeline 13 outside lubrication station; Level switch 14; Energy storage tank 15; Energy storage pressure 16; Compressed air inlet 17; Temperature transmitter TT318; 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 forms; " the lubricating oil temperature control system based on fuzzy control " of the present invention embodiment is the oil temperature control system completed by a set of PLC system on the lubrication system architecture basis of existing lubricating oil, and as shown in Figure 2: the temperature acquisition template by PLC collects the PLC system by temperature required value; 4～the 20mA of analog output template by 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 judgement; E, defuzzification; Its specific practice is: at first, and P, the I of the PID regulator that settles the standard, D parameter.First the TT3 point for measuring temperature is set to a temperature, Application standard PID regulator is controlled setting value is regulated cooling sea water regulating valve, makes it reach stable regulating effect, and so far, P, I, D parameter are determined complete.In the PID regulator parameter that settles the standard, note the retardation time of observing system, lubricating oil flow to the time of TT4 point for measuring temperature from the TT3 point for measuring temperature, and system is write down this retardation time of T1.Set up Fuzzy control system, the TT3 point for measuring temperature is set to an initial desired temperature SP
1, the PID regulator be take this value as target, is regulated, and, after the time period temperature of TT4 point for measuring temperature is sampled through T1, and carries out with desired value, and as the TT4 actual value, higher than desired value, control system is by PID setting value SP
1again assignment, i.e. SP
2=SP
1-Δ t; As the TT4 actual value, lower than desired value, control system is by PID setting value SP assignment, i.e. SP again
2=SP
1+ Δ t; PID be take new setting value as target, is regulated, and through T1 after the time period, then is judged and controls according to method before, until the TT4 point for measuring temperature reaches the target control temperature.So far, system enters steady state (SS), but system can be monitored the temperature variation of TT4 always, if the TT4 temperature exceeds its target zone value, Fuzzy control system can restart, and re-starts adjusting, until system reaches new stable state.
Claims (1)
1. the lubricating oil temperature control system based on fuzzy control, mainly by fuel tank (4), oil conditioner fuel feeding (1), well heater (2), oil conditioner oil return (3), return pressure transmitter (5), main oil return opening (6), oil temperature transmitter (7), liquid level gauge (8), lubricated plant equipment (9), charge oil pressure transmitter (10), the second temperature transmitter (11), charge oil pressure variable valve (12), be connected to the pipeline (13) outside lubrication station, level switch (14), energy storage tank (15), energy storage pressure (16), compressed air inlet (17), the first temperature transmitter (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) forms, it is characterized in that: on the lubrication system architecture basis of existing lubricating oil, increase a set of with temperature acquisition template and analog output template and be used for the PLC system that oil temperature controls, the feature of the method that the lubricating oil temperature control system of fuzzy control is used is: comprise the following steps: a, defining variable, b, obfuscation, c, knowledge base, d, logic judgement, 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 monitoring 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 or amount of decrease value Δ t, b, obfuscation: in the PID system is carried out thermoregulator process by the adjusting cooling sea water regulating valve to the TT3 temperature spot, if the adjusting time is no more than T1, in whole adjustment process, control system is indifferent to TT4 temperature value this moment, until got new temperature at the TT4 point for measuring temperature after elapsed time T1, now system is just contrasted the value that samples and the desired value of TT4, after having contrasted, again determine whether will revise again the setting value of PID regulator, if the temperature value that TT4 samples is in the target control value scope, the set-point of PID regulator is constant, system is still regulated according to setting value before, through T1 after the time period, reexamine the temperature value of TT4, in whole control procedure, system is indifferent to the temperature gap between TT3 and TT4, and just be concerned about its variation tendency, the setting value of PID regulator and the desired value of TT4 are also without concrete linear relationship, c, knowledge base: the lubricating oil of lubricating system from fuel tank out, after cooling sea water regulating valve, enter energy storage tank, lubricating oil is suppressed, just through piping, being delivered to plant equipment afterwards uses, affected by liquid level, environment temperature and plant equipment factor working time in the accumulator tank, 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 TT3 point for measuring temperature oil temperature step-down, elapsed time T1, the oil temperature of TT4 point for measuring temperature also can step-down, the judgement of d, logic: regulating system is through T1 after the time period, the TT4 point for measuring temperature of having flowed through of the lubricating oil after regulating, now temperature signal and the desired value of the collection of TT4 point for measuring temperature are contrasted, if the temperature that TT4 collects is higher than desired value, the temperature value that TT3 also is described is higher, and the PID setting value should suitably be lowered, if the temperature that TT4 collects lower than desired value, also illustrates that the temperature value of TT3 is lower, the PID setting value should suitably raise, fuzzy concept when the imitation mankind judge, use fuzzy logic and fuzzy deduction method to carry out inference, and obtain the fuzzy control signal, and this part is the marrow place of fuzzy controller, e, defuzzification: according to logic judgement before, if after a regulating cycle T1, the TT4 temperature, higher than its desired value, is lowered the PID setting value SP in TT3 adjustment loop, i.e. new SP
n+1=SP
n-Δ t, otherwise, the PID setting value SP in TT3 adjustment loop is raised, i.e. new SP
n+1=SP
n+ Δ t, the resulting fuzzy value of inference is converted to clear and definite control signal, as the input value of system, native system is completed by a set of PLC system, and the temperature acquisition template by PLC collects the PLC system by temperature required value, control the opening degree of cooling sea water regulating valve by analog output template output 4～20mA current signal of PLC simultaneously, concrete implementation method is: at first, P, I, the D parameter of PID regulator settle the standard, first the TT3 point for measuring temperature is set to a temperature, Application standard PID regulator is controlled setting value is regulated cooling sea water regulating valve, make it reach stable regulating effect, so far, P, I, D parameter are determined complete, in the PID regulator parameter that settles the standard, note the retardation time of observing system, lubricating oil flow to the time of TT4 point for measuring temperature from the TT3 point for measuring temperature, and system is write down this retardation time of T1, set up Fuzzy control system, the TT3 point for measuring temperature is set to an initial desired temperature SP
1, the PID regulator be take this value as target, is regulated, and, after the time period temperature of TT4 point for measuring temperature is sampled through T1, and compares with desired value, and as the TT4 actual value, higher than desired value, control system is by PID setting value SP
1again assignment, i.e. SP
2=SP
1-Δ t, as the TT4 actual value, lower than desired value, control system is by PID setting value SP assignment, i.e. SP again
2=SP
1+ Δ t, PID be take new setting value as target, is regulated, and through T1 after the time period, then is judged and controls according to method before, until the TT4 point for measuring temperature reaches the target control temperature, so far, system enters steady state (SS), but system can be monitored the temperature variation of TT4 always, if the TT4 temperature exceeds its target zone value, Fuzzy control system can restart, and re-starts adjusting, until system reaches new stable state.
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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 |
| CN112128602B (en) * | 2020-09-25 | 2021-09-14 | 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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