WO2002067062A1 - Methode de regulation d'une propriete d'un produit resultant d'une transformation chimique - Google Patents
Methode de regulation d'une propriete d'un produit resultant d'une transformation chimique Download PDFInfo
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- WO2002067062A1 WO2002067062A1 PCT/EP2002/001670 EP0201670W WO02067062A1 WO 2002067062 A1 WO2002067062 A1 WO 2002067062A1 EP 0201670 W EP0201670 W EP 0201670W WO 02067062 A1 WO02067062 A1 WO 02067062A1
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- property
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- model
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- regulation
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/048—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators using a predictor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92514—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/926—Flow or feed rate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92657—Volume or quantity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92695—Viscosity; Melt flow index [MFI]; Molecular weight
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
Definitions
- the present invention relates to a method for regulating a property of a product resulting from a chemical transformation process and a regulation device, as well as a chemical transformation method implementing such a method or such a regulation device.
- a chemical transformation method implementing such a method or such a regulation device.
- the industrial application of any chemical transformation process such as for example a process of synthesis, polymerization, degradation or depolymerization requires on the one hand the respect of more or less strict technical specifications of the product and on the other hand a economical and profitable use of inputs.
- the inevitable automation which results from it therefore requires adapted, but flexible methods of control or regulation allowing the best control of chemical processes.
- the attempts at mathematical modeling that underlie these methods are as numerous as the chemical processes to be controlled.
- the models conventionally used are those of the PID type (that is to say comprising a proportional term, an integral term and a differential term) for the individual control of a more or less important number of parameters (for example the temperature , pressure, flow rates etc.).
- This type of model is however difficult to apply to a large number of chemical transformation processes, since the latter are often marred by dead times or significant delays, either in the process itself or in the measures necessary to supply the model.
- the consequences are significant rejects that do not meet the set specifications, due for example to the oscillation phenomenon generated by too late and therefore often excessive correction of the parameters in the model.
- the prediction techniques developed to respond to the limitations of conventional methods could not stand in the way of the success of these simple methods.
- the present invention therefore provides a method of regulating a property of a product resulting from a chemical transformation process, comprising a) modeling the relationship between said property and characteristic quantities of the process, b) fixing d '' a set value for said property, c) the introduction of this set value in a regulation system based on the model obtained in (a) in order to apply to the process at least one characteristic quantity calculated from this value setpoint, d) calculation using the model defined in (a), corrected by a factor taking into account the delay, of a model value of the property of the product corresponding to the characteristic quantity (s) ( s) defined by the control system, e) continuous measurement of the real value of product ownership, f) determination of the difference between this real value and the model value of the property of the product, g) the use of this difference, after filtering, to adapt the setpoint so as to align the actual value and its model value.
- the regulation method according to the invention comprises the calculation (d) of the model value of the property corresponding to the characteristic quantity (s) using the model obtained in (a ), corrected by the factor taking into account the delay and by a factor taking into account the dynamics of the process.
- Such a method which includes only one control loop and which does not involve a direct comparison between the set value and the real value of the property, therefore has an advantage of simplicity compared to conventional techniques which include a regulation based on the comparison of the real value with the set value to which a regulation is superimposed, making use separately of a model for the process and a model for the delay.
- the use of mathematical models defined for the calculation of model values allows computerization and therefore the complete automation of the process, without requiring human intervention for the compensation of errors due to delay or other external disturbances.
- This method can be implemented for any chemical transformation process, such as a synthesis, polyaddition, polymerization, grafting, degradation, etc. process.
- the process envisaged may also include other processing steps, whether of a chemical and / or physical nature, which are necessary for obtaining the desired finished product.
- the property or properties of the product under consideration to be controlled and regulated obviously depends both on the process implemented and on the objective pursued. Mention may be made, by way of non-exhaustive illustration, of the chemical characteristics, such as the nature, respectively the composition of the resulting product, but above all of the physical characteristics, such as the molecular mass, respectively the distribution of the molecular masses, the melting point. , stiffness, viscosity, melt flow index (MFI), swelling in the melt, bubble stability, etc.
- a particular embodiment of the present invention provides that such a method of regulation is applied to a process for converting a polymer in an extruder.
- It may, for example, be a process for crosslinking a polymer, in which use is made of crosslinking agents chosen, for example, from peroxide compounds and diazo compounds.
- It is preferably a depolymerization process using as reactants one or more polymers and one or more depolymerization agents.
- the objective of this depolymerization can for example be the adjustment of the rheological properties of the finished product and it will very often include other steps (called post-treatment), for example a granulation of the product leaving the extruder.
- the polymers envisaged include polymers and copolymers of olefins with two to eight carbon atoms, for example ethylene, propylene, etc.
- Typical polyolefins are (co) polymers of ethylene and propylene, such as, for example, a polypropylene homopolymer (PP) and copolymers of propylene with secondary amounts of other olefins.
- PP polypropylene homopolymer
- the nature of the depolymerization agents is not critical as long as they are suitable for this purpose. Examples are oxygen, oxygen-rich compounds, such as peroxides, persulfates and diazo compounds.
- Preferred depolymerizing agents include diaryl, dialkyl and arylalkyl peroxides.
- 2,5 Dimethyl-2,5 di (terbutylperoxide) hexane is well suited. It is also possible to use several depolymerization agents, separately or as a mixture.
- the term "reagents”, as used in the context of the present invention, also includes other substances which are necessary for the proper performance of the process envisaged, but which do not directly intervene in the reaction or the reactions properly-called (s). They can be any useful additives or adjuvants, such as stabilizers, antioxidant additives, antistatic agents, organic or inorganic dyes and fillers, etc., these additives and adjuvants being able to be added at any appropriate time. Thus, the addition can be carried out simultaneously, as a mixture, successively or even at different stages of the process depending on the nature and the function of the additive or adjuvant considered.
- Another aspect of the present invention contemplates carrying out the measurement of the real value of the property of the product on a sample of the finished product and not on an intermediate product as required by the prior art to reduce the effect of the delay. Indeed, as we mentioned above, the vast majority of chemical transformation processes used in industry involve several chemical and / or physical steps before obtaining the targeted product. The properties of this product are therefore likely to change throughout the process.
- This variant of the present invention thus has the additional advantage of integrating into the regulation also other disturbances which are linked to the post-treatment of the product.
- the real value of the property is used to determine the difference between this real value and the model value, i.e. the value calculated using the mathematical model and corrected by the delay factor and optionally the factor dynamic. This difference is then used to adapt the setpoint so as to align the actual value and the model value.
- this difference is however firstly subjected to a filtering step having the aim of moderating the aggressiveness of the regulator, by example by introducing an appropriate filter, such as a low-pass type filter with adjustable time constant, into the control loop.
- the mathematical model entering into the method of the present invention can be based on an equation of the type
- MV represents the model value or estimated value IV represents the initial value of the property [Rj] represents the concentrations of the reagents [Tj] represents temperatures characteristic of the process
- [F,] represents the flow rates of reagents a, b, cjj, djj, ejj and fjj are constants i and j are natural integers greater than or equal to 1.
- Another embodiment of the present invention is a method of regulation in which the model is based on an equation of the npnp type
- MV, IV, [Rj], [Tj], [Pj], [Fj], i and j have the meanings indicated above, and a ', b', c'y, d'y, e'jj and fjj are constants.
- the delay factor can be represented by any known suitable method, for example by the "Smith predictor” method, as described for example in Chemical Engineering Progress, vol. 53 No 5, May 1957, p. 217-219.
- An advantageous embodiment of the regulation method according to the invention provides that the factor taking account of the delay is obtained by using a shift register.
- the factor taking into account the dynamics of the process is advantageously represented by a "LAG" type function or low-pass filter.
- Such methods and functions are well known to those skilled in the art.
- the present invention provides, in another aspect, a device for regulating a property of a product resulting from a chemical transformation process, comprising at least one unit allowing the regulation of at least one characteristic quantity on base of a setpoint value of the property to be regulated, - at least one calculation unit allowing the determination of a model value of the property to be regulated from the values of the characteristic quantity (s) defined by the regulator, means for continuously measuring the real value of the property of the product, - means for determining the difference between the real value and the model value of the property and for filtering this difference , means for adapting the set value so as to reduce this difference.
- the device according to the invention preferably uses a regulation method in accordance with the present invention, as described above.
- Another embodiment proposes a device in which the calculation unit uses a proportional, integral and / or differential term model corrected by a factor taking account of the delay and possibly by a factor taking into account the dynamics of the process.
- the regulation unit uses the inverse of the model established for the calculation unit.
- the characteristic quantities of the chemical transformation process which can be controlled by the device of the invention are chosen, for example, from the concentrations and flow rates of the reactants, the residence times, the pressures and / or the temperatures of one or more of the process steps.
- the present invention contemplates a chemical transformation method using a control device as described above or implementing a control method according to the invention, to control and regulate a property of a product resulting from 'a chemical transformation process.
- this chemical transformation can represent or include, for example, one or more stages of synthesis, polyaddition, polymerization, grafting and / or degradation, as well as, optionally, one or more physical procedures, such as homogenization, kneading, drying, granulation, molding, etc.
- the preferred process according to the present invention is a depolymerization reaction using as reactants one or more polymers and one or more depolymerization agents.
- polystyrene resin preferably polyethylene glycol dimethacrylate copolymer
- polypropylene preferably polyethylene glycol dimethacrylate copolymer
- polyolefin such as polypropylene
- the depolymerization agent (s) is (are) chosen in particular from oxygen, oxygen-rich compounds, peroxides, persulfates and diazo compounds, as described above.
- the property of the product to be controlled and regulated is the melt flow index (MFI) by acting on the parameters mentioned above.
- MFI melt flow index
- the melt index is determined for example continuously using a rheometer, an IR spectrometer, an NIR spectrometer, an NMR spectrometer and / or an aux analyzer. ultrasound, either directly online, or preferably on a sample of the finished product.
- MFI out A + B. MFI in + C. [PER] + DT
- MFI 0U t represents the estimated melt flow index of the product of the depolymerization
- MFIj n represents the melt flow index of the polymer reagent A, B, C and D represent constants
- [PER] represents the concentration of depolymerization agent in the material entering the process
- T represents the temperature at which the depolymerization reaction takes place.
- the method applied to the regulation of the melt flow index (MFI) of a polymer in which the MFI model corresponds to a first order equation with respect to the concentration of depolymerization agent ([PER]) of type:
- ⁇ ogMFI out A '+ B'. ⁇ ogMFI in + C. [PER] + D'T or even a second order equation
- MFI or t, MFIj n , [PER] and T have the meanings given above and A, B ', C, D', A ", B", Ci “, C2" and D "represent constants.
- the delay factor as well as the dynamic factor are those described above in the context of the present invention and can be defined by any methods known per se, such as more particularly those mentioned above.
- the flow rate (concentration) of the depolymerization agent (s) is in turn regulated by a simple local feedback loop, for example of the PID type, so as to control the flow rate (concentration) actually supplied by the metering devices.
- the actual flow can be determined by any device suitable for this purpose, generally a flow meter, such as a Coriolis flow meter. Another very simple and often sufficient possibility is to infer the flow rate of the rotation speed and the stroke of the pump piston.
- melt melt index of the polymer reagent MFIj n
- T temperature
- the model will then be reduced to a linear model with a single first order variable.
- the delay factor can also be reduced to a pure delay and can be implemented by any suitable method, for example by the "Smith predictor" approach or by the use of a shift register. Also in practice, the factor taking into account the dynamics of the process is most often reduced to a first-order low-pass filter.
- Figure 1 shows the general method according to the invention.
- Figure 2 shows the diagram of a possible application of the present invention: a depolymerization process which is controlled by a method of the present invention.
- Figure 3 illustrates the case of Figure 2 using a simplified first-order model, assuming constant temperature and melt flow index (MFI).
- Figure 4 presents examples of performances obtained in the case of a PP resin.
- the setpoint (SP) is introduced into the regulation system (regulator -1) based on the model developed in step (a) and using for example the inverse of this model.
- the result of the regulation acts on the method (2) regulating the real value of the property (PV) and on the model (3) to calculate the model value (MV).
- the actual value (PV) is measured and compared to the model value (MV) to determine the deviation (E). This difference is then filtered and the filtered difference (Ef) is used to adapt the setpoint (SP).
- Figure 2 is an example of application of this method.
- This is a process used to adjust the rheological characteristics of polypropylene (PP) resins.
- the initial resin (fluff - A) and other additives (B) are mixed in the extruder (1) then added with a depolymerization agent (L) before being extruded and granulated.
- the typical duration of this first stage is of the order of 0.1 minute.
- the granules are then washed (2), wrung (3) and dried (4). This step typically takes 0.5 minutes.
- the resulting granules which represent the finished product are then subjected to rheological measurements (MFI) after fusion, for example in a rheometer of the Gôttfert type.
- MFI rheological measurements
- ⁇ is the delay and the filter is realized by a function of the type
- the typical delay or delay ( ⁇ ) is, as we have seen in Figure 2, in the range of 5 to 20 minutes or more.
- the delay factor is in this case, for example, a Smith predictor or any other suitable method.
- the deposit (MFIgp) is used to determine the quantity (or concentration) of depolymerization agent required [PER] ⁇ p. This concentration is then introduced into the model and the result, that is to say the model value is compared with the real value (MFIpy) to determine the difference (E). After filtration, the filtered difference (Ef) is used to adapt the setpoint (MFI S p).
- the concentration of depolymerization agent is varied by an amount
- Depolymerization is carried out with a polypropylene resin (PP) with an initial MFI of the order of 1 g / 10 min.
- the depolymerization is carried out once with a conventional PID type regulation method and once using the regulation method of the present invention based on a first order model + delay + dynamic factor.
- Figure 4 illustrates the performances obtained without and with regulation (diagrams 4A and 4B respectively) in accordance with the present invention.
- the diagrams show on the abscissa the time expressed in hours and on the ordinate the MFI expressed in g / 10 min and measured using a Gottferd device.
- the diagrams also show the upper and lower limits of the specifications.
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- Evolutionary Computation (AREA)
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- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Feedback Control In General (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002566727A JP2004519051A (ja) | 2001-02-19 | 2002-02-14 | 化学的変換工程の結果としてもたらされた製品の特性を制御する方法 |
US10/276,799 US20040102935A1 (en) | 2001-02-19 | 2002-02-14 | Method for regulating a property of a product derived from a chemical transformation |
EP02700244A EP1275035A1 (fr) | 2001-02-19 | 2002-02-14 | Methode de regulation d'une propriete d'un produit resultant d'une transformation chimique |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0102301A FR2821175A1 (fr) | 2001-02-19 | 2001-02-19 | Methode de regulation d'une propriete d'un produit resultant d'une transformation chimique |
FR01/02301 | 2001-02-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002067062A1 true WO2002067062A1 (fr) | 2002-08-29 |
Family
ID=8860241
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/001670 WO2002067062A1 (fr) | 2001-02-19 | 2002-02-14 | Methode de regulation d'une propriete d'un produit resultant d'une transformation chimique |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040102935A1 (fr) |
EP (1) | EP1275035A1 (fr) |
JP (1) | JP2004519051A (fr) |
FR (1) | FR2821175A1 (fr) |
WO (1) | WO2002067062A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10347825A1 (de) * | 2003-10-10 | 2005-04-28 | Zimmer Ag | Coriolis-Verfahren und -Vorrichtung zur Steuerung der Polymerherstellung |
GB2481431A (en) * | 2010-06-24 | 2011-12-28 | Cherry Pipes Ltd | Polymer Extrusion |
US8825185B2 (en) * | 2011-01-04 | 2014-09-02 | Johnson Controls Technology Company | Delay compensation for feedback controllers |
NL2010258C2 (en) * | 2012-12-12 | 2014-06-02 | Dotx Control Solutions B V | Method of controlling a process with a control signal, computer program, computer program product and control system for controlling a process with a control signal. |
CN104785568B (zh) * | 2015-04-28 | 2017-03-15 | 广东工业大学 | 挤压机挤压过程液压系统建模与能耗分析方法 |
JP6926482B2 (ja) * | 2017-01-13 | 2021-08-25 | オムロン株式会社 | 制御装置、制御方法、制御プログラム |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4448736A (en) * | 1982-05-24 | 1984-05-15 | Standard Oil Company (Indiana) | Continuous in-line melt flow rate control system |
US5568378A (en) * | 1994-10-24 | 1996-10-22 | Fisher-Rosemount Systems, Inc. | Variable horizon predictor for controlling dead time dominant processes, multivariable interactive processes, and processes with time variant dynamics |
US5609136A (en) * | 1994-06-28 | 1997-03-11 | Cummins Engine Company, Inc. | Model predictive control for HPI closed-loop fuel pressure control system |
EP1001320A1 (fr) * | 1998-11-10 | 2000-05-17 | Siemens Aktiengesellschaft | Procédé pour l' identification d' un processus avec retard utilisant une compensation et dispositif pour la commande d' un tel processus |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3356667A (en) * | 1963-10-22 | 1967-12-05 | Phillips Petroleum Co | Process control |
BE1009406A3 (fr) * | 1995-06-09 | 1997-03-04 | Solvay | Methode de regulation de procedes de synthese de produits chimiques. |
US5901059A (en) * | 1996-09-13 | 1999-05-04 | Honeywell Measurex Corp | Method and apparatus for controlling a process using adaptive prediction feedback |
GB2334958B (en) * | 1998-02-25 | 2001-11-07 | Porpoise Viscometers Ltd | Melt flow index determination in polymer process control |
JP3555609B2 (ja) * | 2001-11-30 | 2004-08-18 | オムロン株式会社 | 制御装置、温度調節器および熱処理装置 |
US20030105536A1 (en) * | 2001-12-04 | 2003-06-05 | Eastman Kodak Company | Open and closed loop flow control system and method |
-
2001
- 2001-02-19 FR FR0102301A patent/FR2821175A1/fr active Pending
-
2002
- 2002-02-14 US US10/276,799 patent/US20040102935A1/en not_active Abandoned
- 2002-02-14 WO PCT/EP2002/001670 patent/WO2002067062A1/fr active Application Filing
- 2002-02-14 JP JP2002566727A patent/JP2004519051A/ja active Pending
- 2002-02-14 EP EP02700244A patent/EP1275035A1/fr not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4448736A (en) * | 1982-05-24 | 1984-05-15 | Standard Oil Company (Indiana) | Continuous in-line melt flow rate control system |
US5609136A (en) * | 1994-06-28 | 1997-03-11 | Cummins Engine Company, Inc. | Model predictive control for HPI closed-loop fuel pressure control system |
US5568378A (en) * | 1994-10-24 | 1996-10-22 | Fisher-Rosemount Systems, Inc. | Variable horizon predictor for controlling dead time dominant processes, multivariable interactive processes, and processes with time variant dynamics |
EP1001320A1 (fr) * | 1998-11-10 | 2000-05-17 | Siemens Aktiengesellschaft | Procédé pour l' identification d' un processus avec retard utilisant une compensation et dispositif pour la commande d' un tel processus |
Also Published As
Publication number | Publication date |
---|---|
JP2004519051A (ja) | 2004-06-24 |
FR2821175A1 (fr) | 2002-08-23 |
US20040102935A1 (en) | 2004-05-27 |
EP1275035A1 (fr) | 2003-01-15 |
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