CA2601393A1 - Electronic proportioning valve - Google Patents

Electronic proportioning valve Download PDF

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Publication number
CA2601393A1
CA2601393A1 CA002601393A CA2601393A CA2601393A1 CA 2601393 A1 CA2601393 A1 CA 2601393A1 CA 002601393 A CA002601393 A CA 002601393A CA 2601393 A CA2601393 A CA 2601393A CA 2601393 A1 CA2601393 A1 CA 2601393A1
Authority
CA
Canada
Prior art keywords
water
hot water
valve
cold water
cold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002601393A
Other languages
French (fr)
Other versions
CA2601393C (en
Inventor
Jeffrey Belz
Randall P. Schmitt
Jeff Iott
Cliff Chiang
Thomas A. Barnett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Masco Corp of Indiana
Original Assignee
Masco Corporation Of Indiana
Jeffrey Belz
Randall P. Schmitt
Jeff Iott
Cliff Chiang
Thomas A. Barnett
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Masco Corporation Of Indiana, Jeffrey Belz, Randall P. Schmitt, Jeff Iott, Cliff Chiang, Thomas A. Barnett filed Critical Masco Corporation Of Indiana
Publication of CA2601393A1 publication Critical patent/CA2601393A1/en
Application granted granted Critical
Publication of CA2601393C publication Critical patent/CA2601393C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/13—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures
    • G05D23/1393—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures characterised by the use of electric means

Abstract

An electronic proportioning valve (10) for connection to a cold water source (16), a hot water source (26) and a mixed water outlet (50) and for providing a mixed water (49) of a desired water temperature and flow rate to the mixed water outlet (50).

Claims (40)

1. A water delivery system for connection to a cold water source, a hot water source and a mixed water outlet, and for providing a mixed water of a desired water temperature to the mixed water outlet, the water delivery system comprising:
a cold water valve adapted to be coupled to the cold water source for receiving cold water, and having a cold water outlet;
a hot water valve adapted to be coupled to the hot water source for receiving hot water, and having a hot water outlet;
a fluid mixer configured to receive cold water from the cold water outlet, to receive hot water from the hot water outlet, and to provide a mixed water to the mixed water outlet; and a controller operably coupled to the cold water valve and the hot water valve, the controller being configured to adjust the cold water valve and the hot water valve to regulate a mixed water temperature of the mixed water to substantially correspond to the desired water temperature, the controller being further configured to regulate the mixed water temperature based on at least one characteristic of the cold water, at least one characteristic of the hot water, and at least one characteristic of the mixed water, wherein the controller operates alternatively in a feed forward manner and a feed back manner, the feed forward manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the hot water and the at least one characteristic of the cold water, and the feed back manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the mixed water, the controller operating in the feed forward manner when at least one of the cold water and the hot water is unstable.
2. The water delivery system of claim 1, wherein the controller operates in the feed back manner only when both the cold water and the hot water are stable.
3. The water delivery system of claim 1, wherein the cold water is unstable when at least one characteristic of the cold water changes by at least a predetermined value, and the hot water is unstable when at least one characteristic of the cold water changes by at least a predetermined value.
4. The water delivery system of claim 1, wherein the at least one characteristic of the cold water includes at least one of the temperature of the cold water and the pressure of the cold water, the at least one characteristic of the hot water includes at least one of the temperature of the hot water and the pressure of the hot water, and the at least one characteristic of the mixed water includes at least one of the temperature of the mixed water and the pressure of the mixed water.
5. The water delivery system of claim 4, further comprising a cold water temperature sensor positioned to measure the temperature of the cold water, a cold water pressure sensor positioned to measure the pressure of the cold water, a hot water temperature sensor positioned to measure the temperature of the hot water, a hot water pressure sensor positioned to measure the pressure of the hot water, a mixed water temperature sensor configured to measure the temperature of the mixed water, and a mixed water pressure sensor configured to measure the pressure of the mixed water.
6. The water delivery system of claim 1, wherein the controller is further configured to operate in the feed forward manner when the desired water temperature is unstable by changing by at least a predetermined value.
7. The water delivery system of claim 1, wherein the controller operates in the feed forward manner from an initial opening of at least one of the hot water valve and the cold water valve, and switches to operation in the feed back manner only after both the hot water and the cold water are stable for a predetermined time.
8. The water delivery system of claim 6, wherein the controller returns to operation in the feed forward manner if at least one of the cold water and the hot water become unstable.
9. The water delivery system of claim 1, further comprising:
a cold water servo motor coupled to the cold water valve and configured to control the position of the cold water valve;
a hot water servo motor coupled to the hot water valve and configured to control the position of the hot water valve; and wherein the controller is configured to generate a cold water pulse width modulated signal to control the cold water servo motor for positioning the cold water valve, and to generate a hot water pulse width modulated signal to control the hot water servo motor for positioning the hot water valve.
10. The water delivery system of claim 1, further comprising:
an outlet restriction in fluid communication with the mixed water outlet, an outlet pressure sensor coupled to the mixed water outlet and configured to measure the pressure of the mixed water; and wlierein the controller is configured to adjust the cold water valve and the hot water valve based on the pressure of the mixed water in order to actively compensate for the outlet restriction.
11. A method of controlling a water delivery system to provide a mixed water to a mixed water outlet, the water delivery system having a cold water valve connected to a cold water source, a hot water valve connected to a hot water source, and a mixer for combining cold water from the cold water valve and hot water from the hot water valve, the mixer being connected to the mixed water outlet, the method comprising the steps of:
receiving an input representing a desired temperature of the mixed water being provided to the mixed water outlet;
monitoring at least one characteristic of the cold water provided to the cold water valve, at least one characteristic of the hot water provided to the hot water valve, and at least one characteristic of the mixed water provided to the mixed water outlet;
controlling the cold water valve and the hot water valve in a feed forward manner if at least one of the cold water and the hot water is unstable; and controlling the cold water valve and the hot water valve in a feed back manner only if both the cold water and the hot water are stable.
12. The method of claim 11, wherein the cold water source is unstable when at least one characteristic of the hot water source changes by at least a predetermined value, and the hot water source is unstable when at least one characteristic of the cold water source changes by at least a predetermined value.
13. The method of claim 11, wherein the at least one characteristic of the cold water source includes the temperature of the cold water and the pressure of the cold water, and the at least one characteristic of the hot water source includes the temperature of the hot water and the pressure of the hot water.
14. The method of claim 11, wherein the controller operates in the feed forward manner from an initial opening of at least one of the hot water valve and the cold water valve, and switches to operation in the feed back manner only after both the hot water source and the cold water source are stable for a predetermined time.
15. The method of claim 14, wherein the controller returns to operation in the feed forward manner if at least one of the cold water source and the hot water source become unstable.
16. The method of claim 11, further comprising the steps of:
measuring the pressure of the mixed water; and adjusting the cold water valve and the hot water valve in response to the measured pressure to compensate for a restriction coupled to the mixed water outlet.
17. A proportioning valve system for connection to a cold water source, a hot water source, and a mixed water outlet, and for delivering a mixed water of a desired temperature to the mixed water outlet, the proportioning valve system comprising:
a cold water valve configured to be in fluid communication with the cold water source for receiving cold water;
a cold water temperature sensor configured to measure the temperature of the cold water supplied to the cold water valve from the cold water source and to provide a cold water temperature signal indicative thereof;
a cold water pressure sensor configured to measure the pressure of the cold water supplied to the cold water valve from the cold water source and to provide a cold water pressure signal indicative thereof;
a hot water valve configured to be in fluid communication with the hot water source for receiving hot water;
a hot water temperature sensor configured to measure the temperature of the hot water supplied to the hot water valve from the hot water source and to provide a hot water temperature signal indicative thereof;
a hot water pressure sensor configured to measure the pressure of water supplied to the hot water valve from the hot water source and provide a hot water pressure signal indicative thereof;

a user input device configured to receive the desired temperature from the user and to provide a set temperature signal indicative of the desired temperature;
and a controller in communication with the cold water temperature sensor, the cold water pressure sensor, the hot water temperature sensor, the hot water pressure sensor, and the user input device, the controller being configured to regulate the mixed water temperature of the mixed water to substantially correspond to the desired water temperature by adjusting in a feed forward manner the cold water valve and the hot water valve in response to the cold water temperature signal, the cold water pressure signal, the hot water temperature signal, the hot water pressure signal, and the set temperature signal.
18. The proportioning valve system of claim 17, further comprising:
a cold water servo motor coupled to the cold water valve and configured to control the position of the cold water valve;
a hot water servo motor coupled to the hot water valve and configured to control the position of the hot water valve; and wherein the controller is further configured to generate a cold water pulse width modulated control signal to control the cold water servo for positioning the cold water valve in response to the cold water temperature signal, the cold water pressure signal, the hot water temperature signal and the set temperature signal, and to generate a hot water pulse width modulated control signal to control the hot water servo for positioning the hot water valve in response to the hot water temperature signal, the hot water pressure signal, the cold water temperature signal, and the set temperature signal.
19. The proportioning valve system of claim 17, further comprising:
a mixed water temperature sensor configured to measure the temperature of water supplied to the mixed water outlet and provide a mixed water temperature signal indicative thereof;
wherein the controller is configured to adjust in a feedback manner the cold water valve and the hot water valve in response to the mixed water temperature signal.
20. The proportioning valve system of claim 17, wherein the controller operates in the feed forward manner when at least one of the cold water and the hot water is unstable.
21. The proportioning valve system of claim 20, wherein the cold water is unstable when at least one of the temperature of the cold water, and the pressure of the cold water changes by at least a predetermined value, and the hot water is unstable when at least one of the temperature of the hot water, and the pressure of the hot water changes by at least a predetermined value.
22. The proportioning valve system of claim 17, further comprising:
a mixed water pressure sensor configured to measure the pressure of water supplied to the mixed water outlet and provide a mixed water pressure signal indicative thereof; and wherein the controller is configured to compensate for restrictions to the mixed water flow in response to the mixed water pressure signal.
23. A proportioning valve system for connection to a cold water source, a hot water source, and a mixed water outlet, and for delivering a mixed water of a desired temperature to the mixed water outlet, the proportioning valve system comprising:
a cold water valve configured to be in fluid communication with the cold water source for receiving cold water;
a cold water servo motor coupled to the cold water valve and configured to control the position of the cold water valve;
a cold water temperature sensor configured to measure the temperature of the cold water provided to the cold water valve from the cold water source and to provide a cold water temperature signal indicative thereof;
a hot water valve configured to be in fluid communication with the hot water source for receiving hot water;
a hot water servo motor coupled to the hot water valve and configured to control the position of the hot water valve;
a hot water temperature sensor configured to measure the temperature of the hot water provided to the hot water valve from the hot water source and to provide a hot water temperature signal indicative thereof;

a user input device configured to receive the desired temperature from the user and to provide a set temperature signal indicative of the desired temperature;
and a controller in communication with the cold water temperature sensor, the hot water temperature sensor, and the user input device, the controller being configured to generate a cold water pulse width modulated control signal to control the cold water servo motor for positioning the cold water valve in response to the cold water temperature signal, the hot water temperature signal and the set temperature signal, and to generate a hot water pulse width modulated control signal to control the hot water servo motor for positioning the hot water valve in response to the hot water temperature signal, the cold water temperature signal, and the set temperature signal.
24. The proportioning valve system of claim 23, further comprising:
a cold water pressure sensor configured to measure the pressure of the cold water provided to the cold water valve from the cold water source and to provide a cold water pressure signal indicative thereof;
a hot water pressure sensor configured to measure the pressure of the hot water provided to the hot water valve from the hot water source and to provide a hot water pressure signal indicative thereof; and wherein the controller considers the cold water pressure signal in generating the cold water pulse width modulated control signal, and considers the hot water pressure signal in generating the hot water pulse width modulated control signal.
25. The proportioning valve system of claim 24, wherein the controller is further configured to regulate the mixed water temperature of the mixed water to substantially correspond to the desired water temperature by adjusting in a feed forward manner the cold water valve and the hot water valve in response to the cold water temperature signal, the cold water pressure signal, the hot water temperature signal, the hot water pressure signal, and the set temperature signal.
26. The proportioning valve system of claim 23, further comprising:
a mixed water temperature sensor configured to measure the temperature of water supplied to the mixed water outlet and provide a mixed water temperature signal indicative thereof;

wherein the controller is configured to adjust in a feedback manner the cold water valve and the hot water valve in response to the mixed water temperature signal.
27. The proportioning valve system of claim 23, wherein the controller operates in the feed forward manner when at least one of the cold water and the hot water is unstable.
28. The proportioning valve system of claim 27, wherein the cold water is unstable when at least one of the temperature of the cold water, and the pressure of the cold water changes by at least a predetermined value, and the hot water is unstable when at least one of the temperature of the hot water, and the pressure of the hot water changes by at least a predetermined value.
29. The proportioning valve system of claim 23, further comprising:
a mixed water pressure sensor configured to measure the pressure of water supplied to the mixed water outlet and provide a mixed water pressure signal indicative thereof; and wherein the controller is configured to compensate for restrictions to the mixed water flow in response to the mixed water pressure signal.
30. A water delivery system comprising:
a valve configured to be coupled to a water source for receiving water, and defining a valve restriction;
an actuator operably coupled to the valve and configured to control the position of the valve;
an outlet coupled to the valve;
a fluid delivery device coupled to the outlet and defining an outlet restriction;
an inlet pressure sensor configured to measure inlet pressure of the water provided to the valve;
an outlet pressure sensor configured to measure outlet pressure of the water provided to the outlet; and a controller configured to control the actuator for adjusting the valve in response to the inlet pressure and the outlet pressure, such that the valve restriction is substantially equal to the outlet restriction.
31. The water delivery system of claim 30, wherein the controller is configured to calculate a theoretical flow rate through the outlet restriction based on the inlet pressure and the outlet pressure, and adjust the valve such that the flow rate through the valve is no greater than the theoretical flow rate.
32. The water delivery system of claim 30, wherein the controller operates alternatively in a feed forward manner and a feed back manner, the feed forward manner providing for the adjustment of the valve based on the at least one characteristic of the water provided to the valve, and the feed back manner providing for the adjustment of the valve based on at least one characteristic of the water provided to the outlet, the controller operating in the feed forward manner when the water provided to the valve is unstable.
33. The water delivery system of claim 32, wherein the water is unstable when at least one of the temperature and the pressure of the water changes by at least a predetermined value.
34. The water delivery system of claim 30, further comprising a servo motor coupled to the valve and configured to control the position of the valve, wherein the controller is configured to generate a pulse width modulated signal to control the servo motor for positioning the valve.
35. A water delivery system for connection to a cold water source, a hot water source and a mixed water outlet and for providing a mixed water of a desired temperature to the mixed water outlet, the water delivery system comprising:
a cold water valve adapted to be coupled to the cold water source and having a cold water outlet;
a hot water valve adapted to be coupled to the hot water source and having a hot water outlet;
a fluid mixer configured to receive cold water from the cold water outlet, and to receive hot water from the hot water outlet;
the fluid mixer including a mixing element configured to separate the cold water into a plurality of spaced apart cold water streams, to separate the hot water into a plurality of spaced apart hot water streams, and to mix individual ones of the cold water streams and the hot water streams into a plurality of spaced apart mixed water streams, the fluid mixer being further configured to combine the plurality of mixed water streams into a combined mixed water provided to the water outlet; and a controller operably coupled to the cold water valve and the hot water valve, the controller being configured to adjust the cold water valve and the hot water valve to regulate a mixed water temperature of the mixed water to substantially correspond to the desired water temperature.
36. The water delivery system of claim 35, wherein the controller is configured to regulate the mixed water temperature based on at least one characteristic of the cold water source, at least one characteristic of the hot water source, and at least one characteristic of the mixed water, wherein controller operates in a feed forward manner when the mixed water temperature is unstable and in a feed back manner when the mixed water temperature is stable, the feed forward manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the hot water and the at least one characteristic of the cold water, and the feed back manner providing for the adjustment of the cold water valve and the hot water valve based on the at least one characteristic of the mixed water.
37. The water delivery system of claim 36, wherein the cold water is unstable when at least one characteristic of the cold water changes by at least a predetermined value, and the hot water is unstable when at least one characteristic of the cold water changes by at least a predetermined value.
38. The water delivery system of claim 36, wherein the at least one characteristic of the cold water includes at least one of the temperature of the cold water and the pressure of the cold water, the at least one characteristic of the hot water includes at least one of the temperature of the hot water and the pressure of the hot water, and the at least one characteristic of the mixed water includes at least one of the temperature of the mixed water and the pressure of the mixed water.
39. The water delivery system of claim 35, further comprising:
a cold water servo motor coupled to the cold water valve and configured to control the position of the cold water valve;

a hot water servo motor coupled to the hot water valve and configured to control the position of the hot water valve; and wherein the controller is configured to generate a cold water pulse width modulated signal to control the cold water servo motor for positioning the cold water valve, and to generate a hot water pulse width modulated signal to control the hot water servo motor for positioning the hot water valve.
40. The water delivery system of claim 35, further comprising:
an outlet restriction in fluid communication with the mixed water outlet, an outlet pressure sensor coupled to the mixed water outlet and configured to measure the pressure of the mixed water; and wherein the controller is configured to adjust the cold water valve and the hot water valve based on the pressure of the mixed water in order to actively compensate for the outlet restriction.
CA2601393A 2005-04-19 2006-03-29 Electronic proportioning valve Active CA2601393C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/109,281 2005-04-19
US11/109,281 US7458520B2 (en) 2005-04-19 2005-04-19 Electronic proportioning valve
PCT/US2006/011532 WO2006113075A2 (en) 2005-04-19 2006-03-29 Electronic proportioning valve

Publications (2)

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CA2601393A1 true CA2601393A1 (en) 2006-10-26
CA2601393C CA2601393C (en) 2011-06-14

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CA2601393A Active CA2601393C (en) 2005-04-19 2006-03-29 Electronic proportioning valve

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US (1) US7458520B2 (en)
CA (1) CA2601393C (en)
WO (1) WO2006113075A2 (en)

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US7458520B2 (en) 2008-12-02

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