Source: https://patents.google.com/patent/US7684446
Timestamp: 2018-07-22 20:40:02
Document Index: 28152243

Matched Legal Cases: ['Application No. 200410079193', 'Application No. 2005101088364', 'Application No. 00982386', 'Application No. 06838223', 'Application No. 200703671', 'Application No. 200806425', 'Application No. 200803948']

US7684446B2 - System and method for multiplexing setpoints - Google Patents
System and method for multiplexing setpoints Download PDF
US7684446B2
US7684446B2 US11365395 US36539506A US7684446B2 US 7684446 B2 US7684446 B2 US 7684446B2 US 11365395 US11365395 US 11365395 US 36539506 A US36539506 A US 36539506A US 7684446 B2 US7684446 B2 US 7684446B2
Expired - Fee Related, expires 2027-12-22
US11365395
US20070217442A1 (en )
Robert F. McLoughlin
B01F15/0416—Forming a predetermined ratio of two or more flows, e.g. using flow-sensing or flow controlling devices using one or more pump or other dispensing mechanisms for feeding the flows in predetermined proportion, e.g. one of the pumps being driven by one of the flows
G05D11/16—Controlling mixing ratio of fluids having different temperatures, e.g. by sensing the temperature of a mixture of fluids having different viscosities
B01F2215/0096—Mixing during semiconductor or wafer manufacturing processes
Embodiments of the present invention provide a system and method of providing analog setpoints that eliminate, or at least substantially reduces, the shortcomings of prior art analog setpoint systems and methods. One embodiment of the present invention includes a method of multiplexing analog setpoints comprising transmitting the analog signal to a plurality of target devices, wherein the analog signal represents multiple setpoints, transmitting a first setpoint indicator separate from the analog signal to indicate to a first target device that a first setpoint for the first target device is being represented by the analog signal, saving a first setpoint value asserted by the analog signal at the first target device in response to the first setpoint indicator.
Embodiments of the present invention relate to systems and methods for asserting setpoints. More particularly, embodiments of the present invention relate to systems and method for asserting analog setpoints. Even more particularly, embodiments of the present invention relate to systems and methods for multiplexing multiple analog setpoints on an analog communications link.
Many control devices rely on analog setpoints to indicate a desired state to which a system should be controlled. An analog setpoint is typically a voltage or current applied to a controller that represents a desired value of a measured parameter. The voltage/current may represent a desired value of a temperature, motor speed, pressure, pressure differential, temperature differential or other parameter. The analog setpoint is typically digitized at the controller and converted to a setpoint value for the parameter. The setpoint value can be compared to measured values of the parameter for control purposes. For example, a temperature controller can receive an analog signal of 2.2 Volts, digitize the signal and convert the value to 20 degrees Celsius. The controller can then compare the measured temperature values in a system to determine if the temperature needs to be raised or lowered to reach 20 degrees Celsius. A variety of control schemes, including proportional control schemes, proportional integral, proportional integral derivative, fuzzy logic control schemes are known for controlling a process parameter based on a setpoint.
Many existing controllers only have one or a limited number of analog ports available over which to send or receive a setpoint signal. For a controller that asserts analog setpoints to other controllers, this limits the number of devices it can control. In other words, the number of slave controllers to which a particular master controller can assert setpoints is limited to the number of analog ports at the master controller. Additionally, for each controller to which a setpoint is asserted, a separate analog communications link is required.
Another embodiment of the present invention includes a system for multiplexing analog setpoints comprising a master controller, a plurality of slave controllers connected to the master controller, an analog communications link connecting the plurality of slave controllers to the master controller and one or more digital communications links connecting the plurality of slave controllers to the master controller. The master controller is operable to transmit an analog signal on the analog communications link representing a plurality of analog setpoints, wherein the plurality of setpoints are time multiplexed in the analog signal, transmit a first setpoint indicator on at least one of the digital communications links to the first slave controller in a first period of time and transmit a second setpoint indicator on at least one of the digital communications links to a second slave controller in a second period of time. The analog signal, according to one embodiment, represents a first setpoint in the first period of time and a second setpoint in the second period of time.
Yet another embodiment of the present invention includes a computer program product comprising a set of computer instructions stored on a computer readable medium. The set of computer instructions further comprising instructions executable by a processor to transmit a setpoint signal over a first communications link, wherein the setpoint signal multiplexes a plurality of setpoints, transmit a first setpoint indicator signal to a first target device to indicate to the first target device that the setpoint signal represents a setpoint for the first target device in a first period of time and transmit a second setpoint indicator signal to a second target device to indicate to the second target device that the setpoint signal represents a setpoint for the second target device in a second period of time.
The present invention provides an advantage over prior art systems and methods of asserting analog setpoints by allowing multiple analog setpoints to be asserted on a common analog communications link.
Embodiments of the present invention provide another advantage over prior art systems by allowing a controller to connect to assert analog setpoints to multiple other controllers using a single or a limited number of analog ports.
In addition, embodiments of the present invention provide another advantage by reducing the amount of analog cabling required in systems with multiple controllers.
Embodiments of the present invention provide a system and method for multiplexing analog setpoints. According one embodiment of the present invention, an analog signal source (e.g., a master controller) can assert an analog signal to multiple target devices (e.g., slave controllers) on a common analog communications link. The analog signal can represent a plurality of setpoints. According to one embodiment, setpoint indicators can be asserted to the target devices on digital communications links. When a particular target device receives a setpoint indicator, the target device can save the value of the analog setpoint signal for use as a setpoint. It should be noted that while embodiments of the present invention will be discussed in terms of controllers used in a fluid mixing system, embodiments of the present invention are applicable to any system requiring assertion of multiple analog setpoints.
Based on the fluid type and temperatures of hot fluid 114 and cold fluid 116, flow controller 102 can calculate the densities (ρH, ρC)and specific heats (CpH, CpC) of hot fluid 114 and cold fluid 116. Flow controller 104 can similarly determine the density (pT) and specific heat (CpT) of mixed fluid 118 at the target temperature (tT). For example, if each of hot fluid 114 and cold fluid 116 is D.I. H2O, the densities and specific heats can be calculated based on polynomials using the following coefficients:
Order ρ = f (t) Cp = f (t)
0 .99988 1.00919
1 6.20242E−05 −9.50319E−04
2 −8.37727E−06  2.8655E−05
3 6.62195E−08 −4.28993E−07
4 −4.17404E−10  3.44932E−09
5 1.15955E−12 −1.10643E−11
Using the target flow rate (QT1), target temperature (tT1), hot fluid temperature (tH), cold fluid temperature (tC), specific heats of the hot, cold and mixed fluids (CpH, CpC, CpT)and densities of the hot and cold fluids (pH, pC), controller 104, according to one embodiment, can calculate the target flow rate of cold fluid 116 (QC) to mixer 106 based, for example, on the following equation:
Q C =Q T*(1000/60)*(ρC/ρT)*(t H *Cp H −t T Cp T)/(t H *Cp H −t C *Cp C) [EQN. 1]
QT = target flow rate (lpm)
tT = target temperature (° C.)
tH = hot fluid temperature (° C.)
tC = cold fluid temperature (° C.)
ρC = cold fluid density (g/cm3)
ρH = hot fluid density (g/cm3)
CpC = cold fluid specific heat (cal/g * ° C.)
CpH = hot fluid specific heat (cal/g * ° C.)
CpT = mixed fluid specific heat at tT (cal/g * ° C.)
When a trigger signal is received (step 208), the cold fluid flow controller can begin regulating fluid flow using QC as a flow rate set point and issue commands the hot fluid flow controller to regulate flow of the hot fluid (step 210). The cold fluid flow controller can adjust the flow of cold fluid according to fluid flow control schemes known in the art, including but not limited to differential control schemes, integral control schemes, proportional integral control schemes, fuzzy logic or proportional integral differential control schemes. If the fluid flow of cold water is greater than the fluid flow set point, cold fluid flow controller can decrease the flow rate (step 212), if the fluid flow of cold water is less than the fluid flow set point, the cold fluid flow controller can increase the flow rate, and if the cold fluid flow rate equals the set point (within an acceptable system tolerance) (step 214), the cold fluid flow controller can maintain the flow rate (step 216). Thus, the cold fluid flow controller can adjust the flow rate of cold fluid based on the target cold fluid flow rate set point QC.
The cold fluid flow controller receives inputs including the target mixed chemical mix ratio, the target mixed chemical flow rate (QT2), the cold fluid temperature (tC), the hot fluid temperature (tH), the target mixed chemical temperature (tT2) (step 402). Using the target mixed chemical mix ratio and the target mixed chemical flow rate QT2, the cold fluid flow controller can determine the target DIW flow rate QT1 and the flow rate of the concentrated chemical or other fluid (Qchem) (e.g., NaCl in the example of FIG. 3) (step 406). Assuming that the flow of NaCl will have little effect on the overall temperature of the mixed chemical, the cold fluid flow controller can set the target mixed DIW temperature (tT1) equal to the target mixed chemical temperature (tT2) and determine QC according to EQN 1, where QT=QT1 (step 408). Additionally, the cold fluid flow controller can set tSP=tT1=tT2 (also shown at 409).
FIG. 6A corresponds to the control method implemented at the cold fluid flow controller (e.g., flow controller 104 of FIG. 5), FIG. 6B corresponds to the control method implemented at the hot fluid flow controller (e.g., flow controller 102 of FIG. 5) and FIG. 6C corresponds to the control method implemented at chemical flow controller 310.
The cold fluid flow controller receives inputs including target mixed chemical mix ratio, the target mixed chemical flow rate (QT2), the cold fluid temperature (tC), the hot fluid temperature (tH), the target mixed chemical temperature (tT2) (step 602). Using the target mixed chemical mix ratio and the target mixed chemical flow rate QT2, the cold fluid flow controller can determine the target DIW flow rate QT1 and the f low rate of the concentrated chemical or other fluid (Qchem) (e.g., NaCl in the example of FIG. 5) (step 606). Flow controller 102 can initially act as if the flow of NaCl will have little effect on the temperature of tT2. Therefore, the cold fluid flow controller can set tT=tT2 and determine QC according to EQN 1, where QT=QT1 and tT=tT2 (step 608). Additionally, the cold fluid flow controller can set tSP=tT (also shown at 609).
FIG. 7F is a section view of one embodiment mixer disk 722 along line AA of FIG. 7E. In addition to the features discussed in conjunction with FIG. 7D, FIG. 7F illustrates seating flange 724. In this embodiment, seating flange 724 is an annular ring projecting from the downstream side of mixer disk 722. It can also be noted from FIG. 7F that tabs 736 and 738 can be wedge shaped with the upstream surface of each tab angling 15 degrees inward as it approaches the center of mixer disk 722.
The downstream surface, on the other hand, remains perpendicular to the flow passage. The tabs can have other shapes and there can be more than two tabs, or a single tab. Additionally, the dimensions and angles shown in FIG. 7F are provided by way of example, but not limitation.
FIG. 8C illustrates a cross sectional view of one embodiment of mixer assembly 800. As shown in FIG. 8C, mixer assembly 800, according to one embodiment of the present invention, includes a mixer disk 832 that acts as a static mixer. In the embodiment of FIG. 8C, mixer disk 832 is located in mixer housing 802 at the outlet side of inlet assembly 804. Mixer disk 832 can include a seating flange 834 that rests in a corresponding annular ring of housing assembly 802. Seating flange 834, working in concert with the annular ring as a tongue and groove fitting, can ensure proper seating of mixer disk 832 in mixer housing 802. Additionally, mixer disk 832 can include an annular ring 836 that receives a flange on the outlet side of inlet assembly 804. This also aids in proper seating of mixer disk 832.
During at least part of time period t1, set point signal 1202 changes states from high to low (shown at 1210) indicating that slave device 1104 a should use the 45% of full scale value as its set point. Slave device 1104 a can continue to use this set point value until the set point indicator signal indicates that it should read a new set point from the analog set point signal 1200. Thus, slave device 1104 a can continue to use the 45% of full scale set point even though the value of the analog signal is changing.
1. A method of multiplexing analog setpoints comprising:
transmitting an analog signal to a plurality of target devices on an analog communication link coupled to each of the plurality of target devices, wherein the analog signal represents multiple setpoints, each of the multiple setpoints intended for one of the plurality of target devices;
transmitting a first setpoint indicator on a digital signal bus separate from the analog signal on the analog communication link to indicate to a first target device that a temperature setpoint for the first target device is being represented by the analog signal at a first time; and
saving a first setpoint value asserted by the analog signal at the first target device in response to the first setpoint indicator;
subsequently transmitting a target flow rate setpoint indicator to a second target device on the digital signal bus separate from the analog signal on the analog communication link to indicate to the second target device that a second setpoint is being represented by the analog signal at a second time; and
saving a second setpoint value asserted by the analog signal at the second target device in response to the second setpoint indicator.
2. The method of claim 1, wherein the setpoint indicator comprises one or more bits.
3. The method of claim 1, wherein the analog signal and setpoint indicator are transmitted by the same controller.
4. The method of claim 1, wherein the setpoint indicator is transmitted to the first target device during a time period in which the analog signal is asserting the setpoint value.
5. A system for multiplexing analog setpoints comprising:
a plurality of slave controllers connected to the master controller;
an analog communications link connecting the plurality of slave controllers to the master controller; and
one or more digital communications links separate from the analog communication link connecting the plurality of slave controllers to the master controller;
wherein the master controller is operable to:
transmit an analog signal on the analog communications link representing a plurality of analog setpoints, wherein the plurality of setpoints are time multiplexed in the analog signal and each of the plurality of analog setpoints is intended for one of the plurality of slave controllers;
transmit a first setpoint indicator on at least one of the digital communications links to the first slave controller in a first period of time to indicate to the first slave controller that an analog temperature setpoint for the first slave controller is being represented by the analog signal in the first period of time; and
transmit a second setpoint indicator on at least one of the digital communications links to a second slave controller in a second period of time to indicate to the second slave controller that an analog flow rate setpoint for the second slave controller is being represented by the analog signal in the second period of time;
wherein the analog signal represents the analog temperature setpoint in the first period of time and the analog flow rate setpoint in the second period of time.
6. The system of claim 5, wherein the first and second setpoints have different values.
7. The system of claim 5, wherein the first slave controller is a first flow controller.
8. The system of claim 7, wherein the second slave controller is a second flow controller.
9. The system of claim 5, wherein transmitting the first setpoint indicator comprises changing a state on at least a first of the one or more digital communications links and wherein transmitting the second setpoint indicator comprises changing a state on at least a second of the one or more digital communications links.
10. The system of claim 5, wherein the first slave device is configured to save a value of a first setpoint from the analog signal in response to the first setpoint indicator.
11. The system of claim 10, wherein the second slave device is configured to save a value of the second setpoint from the analog signal in response to the second setpoint indicator.
12. The system of claim 5, wherein the first setpoint indicator comprises one or more bits.
13. The system of claim 5, wherein the second setpoint indicator comprises one or more bits.
14. A computer program product comprising a set of computer instructions stored on a computer readable medium, said set of computer instructions further comprising instructions executable by a processor to:
transmit an analog setpoint signal over a first communications link, wherein the analog setpoint signal multiplexes a plurality of setpoints;
transmit a first setpoint indicator signal to a first target device on a digital signal bus to indicate to the first target device that the setpoint signal represents a temperature setpoint for the first target device in a first period of time; and
transmit a second setpoint indicator signal to a second target device on the digital signal bus to indicate to the second target device that the analog setpoint signal represents a flow rate setpoint for the second target device in a second period of time.
15. The computer program product of claim 14, wherein the setpoint for the first target device and the setpoint for the second target device have different values.
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Owner name: ENTEGRIS, INC.,MINNESOTA