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WO2016064782A1 - Procédé pour la protection de matériel de cvca&r à cycles de charge contre des cycles de fonctionnement courts sous la commande automatique par intervention, dispositifs de commande et systèmes correspondants - Google Patents

Procédé pour la protection de matériel de cvca&r à cycles de charge contre des cycles de fonctionnement courts sous la commande automatique par intervention, dispositifs de commande et systèmes correspondants Download PDF

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Publication number
WO2016064782A1
WO2016064782A1 PCT/US2015/056309 US2015056309W WO2016064782A1 WO 2016064782 A1 WO2016064782 A1 WO 2016064782A1 US 2015056309 W US2015056309 W US 2015056309W WO 2016064782 A1 WO2016064782 A1 WO 2016064782A1
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WO
WIPO (PCT)
Prior art keywords
delay time
start delay
value
command signal
load unit
Prior art date
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Ceased
Application number
PCT/US2015/056309
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English (en)
Inventor
Richard A. Kolk
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.)
PACECONTROLS LLC
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PACECONTROLS LLC
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Publication of WO2016064782A1 publication Critical patent/WO2016064782A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing

Definitions

  • the present invention relates to a method for protecting interventively-controlled duty cycled, electrical energy-consuming heating, ventilating, air conditioning and/or refrigeration equipment, including compressor and/or gas-, oil-, and propane-fired heating equipment with or without blowers, from short cycling.
  • the present invention also relates to an electronic controller for implementing such methods and heating, ventilating, air conditioning, and refrigeration equipment systems incorporating such an electronic controller.
  • HVAC&R Heating, ventilating, air conditioning and/or refrigeration
  • Compressors and blowers used in these systems typically operate with electrically-powered motors.
  • Increased focus on carbon footprint and green technologies has led to numerous energy related improvements including more efficient refrigerants, variable speed compressors and fans, cycle modifications, and more efficient burners.
  • Another strategy such as illustrated in U.S. Patent Application Publication No. 2012/0273581 Al and WO 2014/152276 Al, relates to the use of a retro-fitted or add-on electronic controller device that functions to intercept original equipment manufacturer (OEM) thermostat signals that are in-route to a load unit of an HVAC&R system and replaces them with modulated binary signals that impose automatic control on the operation of the load unit that can supercede OEM thermostat control in beneficial ways.
  • the energy use profile of the load unit for example, can be further controlled by the user as compared to OEM thermostat control signals alone.
  • the modulated binary signals can have a square wave pattern of "on" states and "off states.
  • the retro-fitted or add-on electronic controller device is a passive device in the sense that it only powers up when the OEM signals are intercepted and turns off when the OEM signal discontinues (i.e., the controller has no independent source of operational electrical power of its own drawn from a power line or battery), the pattern of modulated binary signals being interposed into the signal line to the load unit can be abruptly discontinued with the termination of the OEM thermostat signal.
  • the present inventors have recognized that this may result in short cycling of equipment under operational control via the electronic controller.
  • Short cycling has been a concern in the HVAC&R field for many years. Some cooling systems have a tendency for a variety of reasons to turn on and turn off at relatively short intervals and this undesirable phenomenon is usually referred to as short cycling. After an air conditioning compressor has been turned off, for example, it has been desirable that the control system prevent turning on of the compressor for a period of time, typically three to five minutes, in order to prevent damage and excessive wear. Time delays control devices have been incorporated in cooling systems in the past to prevent the short cycling mode of operation, such as conventional motor driven timers and delays circuits (e.g., U.S. Patent Nos. 3,774,082 and 4,991,049).
  • a feature of the present invention is to provide a method which can provide automatic control of duty cycled HVAC&R equipment using a controller that can intercept OEM thermostat signals and replace them with a pattern of modulated binary on and off state signals that can adapt to the last ON cycle being prematurely interrupted by the OEM thermostat signal turning OFF to avoid a short on cycle condition of duty cycled HVAC&R equipment while achieving energy and/or demand setpoints.
  • a further feature of the present invention is to provide an electronic controller which can be used as an add-on device in HVAC&R systems with thermostat control which provides short on cycle protection of duty cycled HVAC&R equipment that is under such automatic control.
  • Another feature of the present invention is to provide systems which incorporate the indicated controller to provide short on cycle protection of duty cycled HVAC&R equipment in the system under such automatic control.
  • the present invention relates to a method for automatically controlling at least one duty cycled HVAC/R equipment powered by electricity with short cycle protection, comprising: a) intercepting a thermostat command signal in-route to at least one HVAC/R load unit at a controller device; b) replacing the thermostat command signal at the controller device with a pulsed command signal which comprises alternating pulse on and pulse off cycles, and a start delay time that i) precedes and delays implementation of the pulse on and pulse off cycles at the load unit and ii) controls short on cycle conditions at the load unit, wherein the start delay time is determined according to computations comprising steps l)-5), which comprise: 1) measuring a last on- time for the most recent pulsed command signal transmitted to the load unit from the controller device, with retrievable storing of the measured last on-time, start delay time and on-time previously computed for and used in the most recent pulsed command signal, 2) calculating a
  • the present invention further relates to a method for automatically controlling at least one duty cycled HVAC/R equipment powered by electricity with short cycle protection, comprising: a) intercepting a thermostat command signal in-route to at least one HVAC/R load unit at a controller device; b) replacing the thermostat command signal with a pulsed command signal that is transmitted from the controller device to the load unit for automatically controlling the load unit while the thermostat command signal is calling for heating, cooling or refrigeration duty by the load unit, wherein the pulsed command signal comprises alternating pulse on and pulse off cycles, and a start delay time that i) precedes and delays implementation of the pulse on and pulse off cycles at the load unit and ii) controls short on cycle conditions at the load unit, wherein the start delay time is determined according to computations comprising steps (l)-(5), which comprise: (1) measuring a last on-time (tOnLast) for the most recent pulsed command signal transmitted to the load unit from the controller device, with retrievable storing of the measured last on-time, start delay time and on-time (t
  • the present invention further relates to an electronic controller device for automatically controlling at least one duty cycled HVAC/R equipment powered by electricity with short cycle protection, comprising: at least one input connector for attaching at least one thermostat signal line and at least one output connector for attaching at least one signal line for outputting a control signal from the controller device to a load unit, wherein the controller device intercepts a thermostat command signal in-route to the load unit and replaces the thermostat command signal with a pulsed command signal that is transmitted to the load unit for automatically controlling the load unit while the thermostat command signal is calling for heating, cooling or refrigeration duty by the load unit, wherein the transmitted pulsed command signal comprises alternating pulse on and pulse off cycles, and a start delay time that i) precedes and delays implementation of the pulse on and pulse off cycles at the load unit and ii) controls short on cycle conditions at the load unit; at least one processor and at least one memory storing instructions, the instructions comprising one or more instructions which, when executed by at least one processor, cause the at least one processor to execute steps comprising the indicated steps
  • the present invention further relates to a HVAC/R system comprising a heating, ventilating, air conditioning or refrigeration unit and the indicated electronic controller device that intercepts a thermostat control signal of the HVAC/R system and is capable of reducing or preventing short cycling of the unit.
  • FIG. 1 is a block/schematic diagram of a HVAC&R system including an electronic controller according to an example of the present invention.
  • FIG. 2 is a block diagram of a microcontroller of the electronic controller of FIG. 1 according to an example of the present invention.
  • FIG. 3 is a block diagram of an HVAC cooling system under OEM thermostat control.
  • FIG. 4A is a plot of a sample of the thermostat control signal, uOEM, indicated in FIG. 3 applied to the equipment.
  • FIG. 4B is plot of the resulting zone temperature signal ("x") and temperature setpoint signal ("o") of the sample of the thermostat control signal, uOEM, indicated in FIG. 3 applied to the equipment.
  • FIG. 5 shows a block diagram of a controller device further installed and integrated into the HVAC cooling system of FIG. 3.
  • FIG. 6 shows a plot of the Delay, On, and Off times required to satisfy an energy saving setpoint when the controller is installed in the configuration in a HVAC cooling application of FIG. 5, which may produce a short on cycle condition as shown, wherein thermostat control signals, "Thermostat Command Signal” (uOEM), are shown in “o” lines and the replacement control signals, "Pace Command Signal” (uPace), are indicated by "x" lines.
  • thermostat control signals "Thermostat Command Signal” (uOEM)
  • uPace "Pace Command Signal”
  • FIG. 7 (broken into FIG. 7A-C) is a flow chart of process control logic for a short on cycle controller of a HVAC&R system, according to an example of the present invention.
  • FIG. 8 is an electrical connection diagram for a single stage cooling application using the electronic controller according to an example of the present invention, wherein this configuration is shown as used when a single thermostat is used to control one HVAC cooling device (e.g., a compressor).
  • HVAC cooling device e.g., a compressor
  • FIG. 9A shows a plot of the Delay, On, and Off times required to satisfy an energy saving setpoint when the controller is installed in the configuration in a HVAC cooling application of FIG. 5 without application of the short on cycle controller algorithm of FIGS. 7A-7C, wherein thermostat control signals, Thermostat Command Signal (uOEM), are shown in “o” and the replacement control signals, Pace Command Signal (uPace), are indicated by "x" lines.
  • thermostat control signals Thermostat Command Signal (uOEM)
  • uPace Pace Command Signal
  • FIG. 9B shows a plot of the Delay, On, and Off times required to satisfy an energy saving setpoint when the controller is installed in the configuration in a HVAC cooling application of FIG. 5 with application of the short on cycle controller algorithm of FIGS. 7A- 7B, wherein thermostat control signals, Thermostat Command Signal (uOEM), are shown in “o” and the replacement control signals, Pace Command Signal (uPace), are indicated by “x” lines, according to an example of the present application.
  • uOEM Thermostat Command Signal
  • uPace Pace Command Signal
  • the present invention relates in part to staged and on/off heating, cooling, and refrigeration equipment under closed loop temperature and/or humidity control via hysteresis thermostat and with an automatic electronic controller providing short on cycle protection installed in series.
  • the automatic electronic controller can be used as an add-on device in HVAC&R systems with OEM thermostat control.
  • An add-on automatic controller of the present invention can implement a short on cycle protection algorithm in an integrated manner with algorithms used to adjust the delay, on, and off time of a cycled control signal sent to a load unit from the controller to achieve energy and/or demand setpoints. While under automatic control of such an add-on controller lacking the short on cycle protection algorithm of the present invention, the last "ON" cycle may be prematurely interrupted by the OEM thermostat signal turning OFF.
  • short on cycle control This creates a situation, referred to herein as “short on cycle,” where the HVAC&R equipment is turned ON and then OFF rapidly at the termination of an OEM cycle, which should be avoided to preserve the life expectancy of the HVAC&R equipment.
  • This present invention provides a control methodology, referred to as short on cycle control, or "SOCC" for short, which is designed to detect and eliminate the short on cycle condition.
  • An automatic electronic controller of the present invention which can provide the SOCC capability can be an add-on controller which can be installed in series in the signal line between an OEM thermostat and a load unit for which additional operational control is desired.
  • the add-on automatic electronic controller can be capable of intercepting OEM thermostat signals and replacing them with a square wave pattern of binary phase modulated on and off state signals that are sent to a load unit of the HVAC&R system, which is augmented to provide short on cycle protection according to the present invention.
  • the term "square wave pattern" refers to signal wave patterns that are geometrically rectangular in shape. As can be appreciated, the profile of a rectangular shaped pulse may not be a geometric square as displayed, such as depending on the layout of the Cartesian coordinate axes used for the plot.
  • Examples of an add-on electronic controller that can function to intercept original equipment manufacturer (OEM) thermostat signals that are in-route to a load unit of an HVAC&R system and replace them with square wave pattern modulated binary signals which impose automatic control on the operation of the load unit, are shown in U.S. Patent Application Publication No. 2012/0273581 Al and WO 2014/152276 Al, which are incorporated herein in their entireties by reference.
  • Other electronic controllers that have these control signal generation capabilities also may be adapted for use herein.
  • the modulated binary signals that can be generated by these devices can have a square wave pattern of "on" states and "off states.
  • the square wave can be comprised of alternating upstanding square (rectangular)-shaped ON pulses that are separated by intervening OFF state regions.
  • a square wave can be a non-sinusoidal periodic waveform, in which the amplitude ideally alternates at a steady frequency between fixed minimum and maximum values, with the same duration at minimum and maximum. The transition between minimum to maximum is instantaneous for an ideal square wave.
  • Square wave signal patterns are generally known in the electronic signal field, and are illustrated in several figures included herein (e.g., FIGS. 4A, 6, 9A, 9B).
  • the add-on electronic controller device typically is a passive device in the sense that it only powers up when the OEM signals are intercepted through the incoming signal line, and turns off when the OEM signal discontinues.
  • the pattern of modulated binary signals being interposed into the signal line to the load unit can be abruptly discontinued with the termination of the OEM thermostat signal, which may result in short cycling of equipment under operational control via the electronic controller if "on" state pulses are truncated down to a very short time period.
  • An algorithm that can be embodied in and implemented from an electronic controller is provided in the present invention that detects and prevents the short cycling from occurring or persisting.
  • a time delay imposed before initiating transmission of the modulated binary signals from the electronic controller to the load unit can be adjusted in its duration to eliminate a detected short cycle condition.
  • the SOOC can detect a short on cycle condition or event in the previous cycle, and if so, by how much.
  • the initial time delay can be decreased, and if the short cycle exceeds the first preselected start delay time threshold, then the initial time delay can be increased, unless it approaches (but does not reach) a full cycle based on reference to another (second) preselected start delay time threshold wherein no time delay adjustment would be imposed.
  • the adjustment of the initial time delay effectively can shift the square wave pattern of the binary modulated control signals (rightward or leftward) to reduce or eliminate the truncation of the last ON pulse.
  • a thermostat command signal in-route to at least one HVAC/R load unit at can be intercepted at the controller device and replaced at the controller device with a pulsed command signal which comprises alternating pulse on and pulse off cycles, and a start delay time that i) precedes and delays implementation of the pulse on and pulse off cycles at the load unit and ii) controls short on cycle conditions at the load unit.
  • the control signal generated by the controller of the present invention can be generated in a square wave pattern of "on" states and "off states.
  • the start delay time can be determined according to a series of computations.
  • the last on-time is measured for the most recent pulsed command signal transmitted to the load unit from the controller device, with retrievable storing of the measured last on-time, start delay time and on-time previously computed for and used in the most recent pulsed command signal. Then, a time fraction can be calculated as the last measured on-time divided by the on-time previously computed, wherein the time fraction is calculated as a value between zero and one (0 and 1). The value of the calculated time fraction can be compared to preselected values between zero and one for at least a first start delay time threshold and a second start delay time threshold having a greater value than that of the first start delay time threshold. The start delay time is decreased for a first operating region where the calculated time fraction value is less than the first start delay time threshold.
  • the start delay time is increased for a second operating region where the calculated time fraction value is greater than the first start delay time threshold and less than the second start delay time threshold.
  • the start delay time is held fixed at the previous value thereof for a third operating region where the calculated time fraction value is greater than or equal to the second start delay time threshold.
  • the first start delay time threshold can be a preset single value between 0.2 to 0.5, or between 0.3 to 0.4, or other values
  • the second start delay time threshold can be a preset single value between 0.7 to 0.95, or between 0.8 to 0.9, or other values
  • the first and second start delay time thresholds are different and preferably differ by at least 0.2, or at least 0.25, or at least 0.3, or at least 0.35, or at least 0.4, or at least 0.45, or at least 0.5, or other values.
  • the first start delay time threshold can be a preset single value of 0.2, 0.3, 0.4, or 0.5, or any intervening values between these values
  • the second start delay time threshold can be a preset single value of 0.7, or 0.8, or 0.9, or 0.95, or any intervening values between these values.
  • the start delay time can be decreased an amount of from about 180 seconds to about 100 seconds, or from about 170 seconds to about 110 seconds, or from about 160 seconds to about 120 seconds or other values, from a value thereof used in the most recent pulsed command signal.
  • the start delay time can be increased an amount of from about 180 seconds to about 360 seconds, or from about 200 seconds to about 330 seconds, or from about 225 seconds to about 300 seconds or other values, from a value thereof used in the most recent pulsed command signal.
  • the predetermined delay limit minimum value can be a value in the range of 50 seconds to 150 seconds, such as 100 seconds or other predetermined value
  • the predetermined delay limit maximum value can be a value of 300 seconds to 420 seconds, such as 360 seconds or other predetermined value.
  • first and second start delay time thresholds to define three operating regions
  • the number of start delay time thresholds and operating regions may be decreased to one start delay time threshold to define only two operating regions, or the number of start delay time thresholds may be increased to three or more to define four or more operating regions.
  • FIG. 1 shows a HVAC&R system 11 including an electronic controller device 18 on which the indicated short on cycle protection algorithm program and other control programs can reside and from which the programs can be executed for signal processing and generation.
  • the electronic controller 18 can be retrofitted in the system 11 to provide control of at least one HVAC&R load unit 20 that provides condition control in a zone 2.
  • Power line 10 passes through utility meter 12 at the structure where at least one load unit 20 to be controlled is located.
  • Meter 12 measures usage and demand of electrical energy at that location.
  • Load unit 20 can be, for example, an air conditioner, heat pump, furnace, refrigerator, boiler, or other load unit of a HVAC&R system.
  • Operative main power line 10 generally is unconditioned, and supplies operative power to load unit 20 via load control switch 26, such as a relay, and typically other load units and appliances in the same structure (not shown).
  • the power supply line 10 can be, for example, a 110 volts alternating current (VAC), or 220 VAC, or other mains power supply line powering the HVAC&R system 11 to be retrofit with the controller 18.
  • the system 11 to be retrofit has at least one standard thermostat 14 connected to the HVAC&R load unit 20.
  • Thermostat 14 can be connected via line 13 to power line 10.
  • a step-down transformer such as 24 volt transformer, which may be used in powering the thermostat from power line 10, is not illustrated in this figure, but is illustrated in the wiring diagram shown in FIG. 5.
  • Electronic controller device 18 is not directly powered from power line 10, and it does not need to be. Electronic controller device 18 is powered by the thermostat signaling intended for the load device(s). The electronic controller device 18 typically is electrically dormant (or inactive) or sleeps with respect to its signal processing features until receiving/intercepting an ON signal from the thermostat, and then controller device 18 becomes awakened (active) to apply a suite of programs including the short on cycle protection algorithm such as shown herein for signal control processing and control signal generation to the intended load device(s).
  • a control signal line 15 of thermostat 14 can transmit an AC voltage of 24 volts during the periods when a thermostatic control is, for example, calling for cooling from an air conditioning unit (load unit), or heating from an electric furnace, and so forth.
  • the control signal would normally activate load control switch 26 in main power line 10 to power the load unit 20. That is, in the absence of electronic controller device 18, control signal line 15 would be in control of opening or closing load unit control switch 26, and thereby opening or closing the circuit of operative power line 10 and controlling the flow of operative power to load unit 20.
  • the electronic controller device 18 is interposed and installed in the thermostat control signal line 15 in series at some point between thermostat 14 and the load unit control switch 26. As shown, thermostat line 15 can be cut and connected at one cut end to electronic controller device 18. As also shown, the remaining portion of the cut signal control line, referenced as line 24, can be connected at one end to electronic controller device 18 and at the other end to load control switch 26.
  • the electronic controller device 18 can be physically mounted, for example, in sheet metal (not shown) near the load unit 20, such as a standard sheet metal construction enclosure used with the load unit.
  • this tapping of controller device 18 into the control signal line 15 (24) is made as close as practically feasible to the load control switch 26.
  • the connection of electronic controller device 18 in the control signal line could be made, for example, within the casing containing the compressor unit of a residential air conditioning unit.
  • the electronic controller device 18 could be mounted in a sheet metal enclosure that houses the OEM controls for a compressor of an air conditioning unit as installed on a slab or platform near ground level immediately adjoining a home or building supported by the unit, or on a rooftop thereof.
  • Electronic controller device 18 can include on-board user interface controls 19 and/or can receive control inputs and/or parameter data 23 from a remote input device 21, which can be further understood by other descriptions herein that will follow.
  • the input device 21 can be "remote" in the sense that it is a physically separate device from electronic controller device 18, which can communicate with the controller, such as via an attachable/detachable communication wire or cable link or a wireless communication link.
  • electronic controller device 18 receives electrical flow over control signal line 15 based on a thermostat control signal intended for powering up the load unit 20, and electronic controller device 18 can immediately awaken to intercept the thermostat signal and initiate its suite of control programs before an output control signal is sent from the electronic controller device 18 to the load unit switch 26.
  • the output control signal may be a replacement signal for the OEM signal or the OEM signal, depending on the outcome of the running of the controller's algorithm.
  • the thermostat 14 preferably is (pre)configured to generate only an ON/OFF signal, by which the air conditioner/heat pump compressor, furnace, or other load unit is turned on/off.
  • the thermostat 14 used in the system 11 is designed to provide ON/OFF control at a load unit to turn the load unit completely on or completely off.
  • the thermostat can decide if the output needs to be turned on, turned off, or left in its present state.
  • ON/OFF control by an OEM thermostat typically comprises selecting a set point, and a native or default OEM deadband may apply or may be selected by a user, that straddles the set point.
  • the electronic controller device 18 does not need direct inputs from a dedicated temperature sensor to operate and function as designed.
  • the temperature sensing capability of the existing thermostat or thermostats in the system, or systems that include a remote sensor(s) that is capable of transmitting such information to the thermostat(s) for processing by that unit(s), can be relied on for the systems of the present invention.
  • a temperature signal can be estimated from OEM control signal timing and existing ASHRAE or similar data for setpoint and hysteresis temperature values.
  • FIG. 1 shows a single control line 15 cut and connected from a single thermostat 14 and connected to the electronic controller device 18 for simplification, it will be appreciated that in single or dual thermostat configurations, multiple control lines from a single thermostat, or a single control line from each of multiple thermostats each can be cut and separately connected to the electronic controller device 18, such as different respective input pins of the electronic controller.
  • an output signal control line can be connected at one end to electronic controller device 18 and at the other end to the load control switches of each load device. For example, although only one load unit 20 under the load control and management of electronic controller device 18 in a single control signal line is shown in the HVAC&R system 11 of FIGS.
  • the HVAC&R system 11 can include multiple individual loads under thermostat control, such as, for example, multiple compressors, or a compressor unit and a blower, and other similar or diverse loads, depending on the configuration.
  • the electronic controller of this invention can be wholly connected in the control lines of individual subloads of the equipment.
  • an air conditioner may have a separate control line for the subloads of the compressor unit and the blower unit.
  • the electronic controller can be used to control either one or both of these subloads.
  • the overall power line to all the subloads of the air conditioning unit is generally not in any way altered by the electronic controller of this invention.
  • the usual conventional electrical grounding means is not shown in the schematic diagram of FIG. 1 as it is not a matter of particular concern in this invention.
  • a stand-alone configuration can be used, for example, in a single load unit residential application (e.g., ⁇ about 5 ton HVAC&R load unit).
  • a networked configuration can be used, for example, as part of a building management system (BMS) for providing HVAC&R in a larger scale applications, such as higher energy use/demand residential, commercial or industrial buildings or equipment, and the like, or, as a network of electronic controllers, each attached to a dedicated load unit.
  • BMS building management system
  • the electronic controller device 18 in FIG. 1 includes at least one microprocessor operable to receive thermostat input signals, apply the indicated programs to thermostat signals received, and transmit an output signal under the command of the microcontroller to the HVAC&R load unit to be controlled.
  • the microcontroller 183 which is included in controller device 18 in FIG. 1, can include, for example, a microprocessor for storing and executing the indicated the indicated short on cycle protection program and other control programs , as well as performing data collection function, controlling signal generation to the load device(s), and calculating the demand savings.
  • microcontroller 183 can include a microprocessor 1832, a computer-readable storage medium 1833 shown as incorporating memory 1835, and clock 1840, which all have been integrated in the same chip.
  • Microprocessor 1832 also known as a central processing unit (CPU), contains the arithmetic, logic, and control circuitry needed to provide the computing capability to support the controller functions indicated herein.
  • CPU central processing unit
  • the memory 1835 of the computer- readable storage medium 1833 can include non- volatile memory, volatile memory, or both.
  • Computer-readable storage medium 1833 can comprise at least one non-transitory computer usable storage medium.
  • the non-volatile memory can include, for example, read-only memory (ROM), or other permanent storage.
  • the volatile memory can include, for example, random access memory (RAM), buffers, cache memory, network circuits, or combinations thereof.
  • the computer-readable storage medium 1833 of the microcontroller 183 can comprise embedded ROM and RAM. Programming and data can be stored in computer-readable storage medium 1833 including memory 1835.
  • Program memory can be provided, for example, for the short on cycle protection program 1834, and other programs used to generate the initial pattern of modulated binary signals before application and adjustment thereof using the SOOC, such as a delayed start controller program 1836, demand regulator controller program 1837, excess time controller program 1831, and excess cycle controller program 1839, as well as store menus, operating instructions and other programming such as indicated herein, parameter values and the like, for controlling the controller device 18.
  • These programs can be stored in ROM or other memory.
  • the indicated the short on cycle protection program 1834, and other programs, such a delayed start controller program 1836, demand regulator controller program 1837, excess time controller program 1831, and excess cycle controller program 1839 provide an integrated control program 1838 residing on controller device 18.
  • Data memory such as FLASH memory
  • Memory can be configured with data parameters.
  • Memory can be used to store data acquired that is related to the operation of a load device to be controlled, such as thermostat command on times and calculated off times.
  • the clock 1840 can be a real time clock which does not power down with microprocessor features of the controller during OFF states.
  • the clock 1840 provides a timing device that can be used for recording the onset or termination of the "ON" states.
  • the electronic controller 18 can learn the thermostat OEM control behavior by recording "ON" states and their duration in time, and calculating "OFF" times.
  • the time duration of "OFF” states can be calculated by recording the time when the controller powers down as it will coincide with an OFF state of the duty cycle based on thermostat control, and recording the next time when OEM powers up again when intercepting the next successive power ON signal sent by the thermostat and intended for the load unit, and calculating the difference between these two recorded times as corresponding to the duration of that "OFF time.”
  • This data can be stored in non-volatile FLASH memory or other memory of the microprocessor.
  • the clock 1840 can be, for example, a real time digital clock.
  • the clock 1840 can be battery powered (e.g., a lithium disc battery, and the like).
  • the microprocessor 1832, memory 1833, and clock 1840 can be integrated and supported on a common mother board 1830, or the like, which can be housed in an enclosure (not shown) having input and output connection terminal pins, a communication link/interface connector port(s) (e.g., a mini-, or micro- or standard-size USB port for receiving a corresponding sized USB plug), and the like, which are discussed further with respect to FIG. 8.
  • a communication link/interface connector port(s) e.g., a mini-, or micro- or standard-size USB port for receiving a corresponding sized USB plug
  • Microcontroller 183 can be, for example, an 8 bit or 16 bit or larger microchip microprocessor including the indicated microprocessor, memory, and clock components, and is operable for input and execution of the indicated short on cycle protection controller program and other programs.
  • Programmable microcontrollers can be commercially obtained to which the control program indicated herein can be inputted to provide the desired control. Suitable microcontrollers in this respect include those available from commercial vendors, such as Microchip Technology Inc., Chandler, AZ.
  • microcontrollers examples include, for example, the PIC16F87X, PIC16F877, PIC16F877A, PIC16F887, dsPIC30F4012, and PIC32MX795F512L-801/PT, by Microchip Technology, Inc.; Analog Devices ADSP series; Jennie JN family; National Semiconductor COP8 family; Freescale 68000 family; Maxim MAXQ series; Texas Instruments MSP 430 series; and the 8051 family manufactured by Intel and others. Additional possible devices include FPGA/ARM and ASIC's.
  • the short on cycle protection program and other controller programs indicated herein can be inputted to the respective microcontrollers using industry development tools, such as the MPLABX Integrated Development Environment from Microchip Technology Inc.
  • controller device 18 is illustrated in FIG. 1 as a stand-alone unit tapped into the thermostat signal line 15 (24) to the load unit to be controlled, the indicated microelectronics of the controller optionally may be incorporated and integrated into the thermostat unit or a Building Management System (BMS).
  • BMS Building Management System
  • An algorithm incorporating the short on cycle protection controller program, and other indicated control programs and features of the electronic controller device can be added to native thermostat signal control software of the thermostat, or can be added to Building Management System (BMS) software where a BMS provides control to the load unit or units of the HVAC&R, eliminating a need for a physically separate electronic controller device.
  • the interception of the OEM thermostat signal and processing thereof by the controller microelectronics can occur at the modified thermostat unit without the need for a physically separate microelectronic controller being tapped into the thermostat signal line 15 (24) between the thermostat and the load unit to be controlled.
  • FIG. 3 a block diagram of an HVAC cooling system under OEM thermostat control is presented in FIG. 3.
  • T* is the temperature setpoint and the output of the block entitled "Zone” is the zone temperature.
  • a sample of the thermostat control signal, uOEM, applied to the Equipment is shown in FIG. 4A, and the resulting zone temperature signal ("x") and temperature setpoint signal ("o") are presented in FIG. 4B.
  • FIG. 5 shows a block diagram of a controller device which includes a Pace Controller further installed and integrated into the HVAC cooling system of FIG. 3. The Pace Controller intercepts the OEM thermostat signals and replaces them with modulated binary signals that exert automatic control over the equipment.
  • FIG. 6 shows a plot of the Delay, On, and Off times required to satisfy an energy saving setpoint when the Pace controller is installed in the configuration of a HVAC cooling application of FIG. 5, which may produce a short on cycle condition as shown, wherein thermostat control signals, Thermostat Command Signal (uOEM), are shown in “o” lines and the replacement control signals, Pace Command Signal (uPace), are indicated by "x" lines.
  • uOEM Thermostat Command Signal
  • uPace Pace Command Signal
  • FIG. 6 A short on cycle condition is illustrated in FIG. 6, wherein the multiple (two) square (rectangular)-shaped ON state pulses ("x") generated by the controller for each OEM pulse ("o") intercepted from the OEM thermostat in this illustration should have equivalent width, but do not.
  • the right-hand side ON pulse of the pairing of pulses generated by the controller is significantly narrower in width than the left-hand side ON pulse, which corresponds to significantly shortened ON state durations. If not corrected, this condition can cause short cycling of the equipment. Short on cycling can occur when the add-on controller signal turns ON, and then is forced to turn OFF a short time later when the OEM turns off.
  • a short on cycle controller (SOCC) of the present invention detects the presence of short on cycling and adjusts the delay time ("tDelay"), either increasing or decreasing it, to reduce the short on cycle effect.
  • tDelay As tDelay is increased in a cooling application, there becomes a larger temperature to "pull down” requiring more controller ON pulses and an increase in the time of the last controller ON pulse. As tDelay is decreased in a cooling application, the temperature pull down decreases requiring fewer controller ON pulses. It can be understood that a larger pulldown temperature occurs in cooling applications, whereas a larger pullup temperature occurs in heating applications. Additional illustration of the short on cycling condition and its resolution by the present invention are shown infra in discussions of FIGS. 9 A and 9B in the examples.
  • a demand control algorithm can include a short cycle protection algorithm to adjust the tDelay to eliminate the short on cycle condition, such as using the following steps.
  • Step 2 The region of SOCC operation, "OperatingRegion” is evaluated based on the value of k, the "AdvanceThreshold” value and the "DelayThreshold” value.
  • the AdvanceThreshold can be a preset value between 0 and 1, typically set to a value between 0.3 to 0.4, or other values.
  • OperatingRegion 1
  • the DelayThreshold is a preset value between 0 and 1, typically set to a value between 0.8 to 0.9, or other values.
  • Step 3 The calculated tDelay value is limited to lie between preset limits, tDelayLimitMIN and tDelayLimitMAX before it is sent to the controller algorithm used to calculate tOn and tOff times to obtain at least one of a demand setpoint and an energy setpoint for a preselected temperature setpoint.
  • a block diagram of the SOCC is presented in FIG. 7.
  • the four preset SOCC parameters are defined at the top of the block diagram (101).
  • the tOnLast value (102) and the k value (tOnLast/tOn)(103) are calculated.
  • the OperatingRegion (104) is determined from the value of k in the section of the diagram entitled "State Machine to calculate the Operating Region".
  • the remainder of the diagram is the SOCC logic (105) described in above-indicated Steps 2 and 3.
  • a flag, iRev is calculated to establish whether the SOCC can successfully reduce tDelay to eliminate the Short On Cycle condition. In some situations, this cannot be achieved because of the tDelayLimitMIN value.
  • the iRev flag is set to "1" and causes the state machine to change the OperationRegion from 1 to 2 (change from reducing tDelay to increasing the tDelay value).
  • FIG. 8 shows an electrical connection diagram 1000 for a single stage cooling application using an electronic controller device according to an example of the present invention.
  • This configuration can be used when a single air conditioner thermostat is used to control one HVAC cooling device (a compressor).
  • HVAC cooling device a compressor
  • This configuration also supports thermostats that provide a manual switch to select either heating or cooling operation.
  • the compressor can be a compressor suitable for use in vapor- compression cooling/refrigeration systems.
  • the compressor can include an electric motor (not shown), used to drive the compressor.
  • the electric motor itself can be a conventional electric motor or other suitable electric motor used or useful for driving such load units.
  • the electronic controller device 1018 provides two independent control channels that may be wired to support different equipment configurations.
  • the first channel 1001 A comprises one of pins 1-3
  • the second channel 100 IB comprises one of pins 4-6 thereof.
  • Output lines to the load unit(s), e.g., a cooling unit compressor, are shown as extending from one of pins 4-6.
  • the controller provides a separate "dry contact" input channel that may be used for remote control of the controller, such as by an existing BMS system.
  • pins 1-2 thereof can be used for this dry contact input module.
  • a communication port 1020 is shown in these figures as a mini-USB port (e.g., a camera size USB port) but is not limited thereto.
  • a service tool (not shown) can be used to import/input parameters, and the like into the electronic controller device 1018 by making a communication link with the controller via port 1020.
  • the electronic controller device 1018 can have the indicated short on cycle protection controller program and other control programs preloaded into the controller on-board memory during its assembly and before installation in the field.
  • the thermostat e.g., an OEM thermostat
  • the thermostat which can be used with the electronic controller device of the present invention, such one having the wiring configuration shown in FIG. 8 or another configuration, can deployed at some point in a building and senses the temperature of the ambient air and if it is higher than the comfort setting which has been selected, sends a signal to activate the air conditioning unit.
  • the electronic controller device intercepts the thermostat signal, which powers up the electronic controller device to process the signal according to the programmed algorithm of the short on cycle controller and other control programs before sending a controller- processed output signal to the load unit.
  • the air conditioning unit typically comprises the compressor, and a condenser and evaporator connecting with each other in a closed refrigerant system (not shown).
  • the refrigeration cycle itself is well known (e.g., see, U.S. Patent No. 4,094,166, which is incorporated herein by reference in its entirety).
  • gaseous refrigerant is delivered from the compressor to the condenser coil where it gives up heat and then is passed through an expansion valve to the evaporator coil where it absorbs heat from the circulating air which is passed thereover by the evaporator fan.
  • the thermostat senses that the ambient air has been cooled to the selected level, the thermostat goes to an off state to turn off the compressor, evaporator fan and condenser fan until the ambient temperature has again reached the level where further cooling is necessary.
  • the electronic controller device of the present invention goes to sleep when the thermostat stops signaling the load unit, until the next power on signal is sent by the thermostat to the same load unit which, as indicated, will be intercepted by the electronic controller device which powers up the electronic controller device to process the signal according to its programmed algorithm before sending a controller-processed output signal to the load unit.
  • a deadband typically is applied to the control temperature setting at the thermostat, which deadband effectively can be modified by the electronic controller device to improve demand savings in a controlled manner.
  • the indicated pin assignments for the first channel 1001 A and second channel 100 IB that are identified in FIG. 8 can apply in similar pin module for other types of load units of an HVACR system, such as a dual stage cooling unit, a heating unit (e.g., gas, electric, heat pump), a boiler, and so forth.
  • Other aspects of an electrical connection configuration that can be used in these other types of load units can be readily adapted and implemented as applicable.
  • an electronic controller device having the indicated short on cycle protection controller is operable to intercept and process a thermostat's control signal with an algorithm that can automatically generate enhanced control signals to achieve energy and/or demand setpoints while reducing or eliminating short on cycle events.
  • existing HVAC&R systems for example, can embody the present controller such as illustrated herein to improve energy use and reduce wear on heating, cooling, and refrigeration equipment.
  • the present invention includes the following aspects/embodiments/features in any order and/or in any combination:
  • the present invention relates to a method for automatically controlling at least one duty cycled HVAC/R equipment powered by electricity with short cycle protection, comprising:
  • step l)-5 replacing the thermostat command signal at the controller device with a pulsed command signal which comprises alternating pulse on and pulse off cycles, and a start delay time that i) precedes and delays implementation of the pulse on and pulse off cycles at the load unit and ii) controls short on cycle conditions at the load unit, wherein the start delay time is determined according to computations comprising steps l)-5), which comprise:
  • step 2) comparing the value of the time fraction calculated in step 2) to preselected values between zero and one for at least a first start delay time threshold and a second start delay time threshold having a greater value than that of the first start delay time threshold, and further wherein (i) for a first operating region where the calculated time fraction value is less than the first start delay time threshold, then the start delay time is decreased, (ii) for a second operating region where the calculated time fraction value is greater than the first start delay time threshold and less than the second start delay time threshold, then the start delay time is increased, and (iii) for a third operating region where the calculated time fraction value is greater than or equal to the second start delay time threshold, then start delay time is held fixed at the previous value thereof,
  • step 4) determining if the start delay time value determined in step 3) lies between a predetermined delay limit minimum value and a predetermined delay limit maximum value, and continuing to step 5) where such condition is satisfied, and 5) calculating on-time and off-time to obtain at least one of a demand setpoint and an energy setpoint for a preselected temperature setpoint, using the start delay time value determined in step 3), for use in producing a pulsed command signal which is transmitted to the load unit.
  • step 4 when the time fraction value is determined in step 4) to be less than the predetermined delay limit minimum value, then the start delay time value is instead increased, and that increased value of start delay time is used in step 5).
  • first start delay time threshold is a preset single value between 0.2 to 0.5
  • second start delay time threshold is a preset single value between 0.7 to 0.95.
  • first start delay time threshold is a preset single value between 0.3 to 0.4
  • second start delay time threshold is a preset single value between 0.8 to 0.9.
  • first start delay time threshold is a preset single value of 0.3
  • second start delay time threshold is a preset single value of 0.8
  • step 3 when the time fraction value is less than the first start delay time threshold, the start delay time is decreased an amount of from about 180 seconds to about 100 seconds from a value thereof used in the most recent pulsed command signal.
  • step 3 when the time fraction value is greater than the first start delay time threshold and less than the second start delay time threshold, the start delay time is increased an amount of from about 180 seconds to about 360 seconds from a value thereof used in the most recent pulsed command signal.
  • the predetermined delay limit minimum value is a value of 100 seconds
  • the predetermined delay limit maximum value is a value of 360 seconds.
  • the load unit of the HV AC/R system comprises a compressor, a blower, or an igniter.
  • the present invention further relates to a method for automatically controlling at least one duty cycled HVAC/R equipment powered by electricity with short cycle protection, comprising:
  • step (l)-(5) replacing the thermostat command signal with a pulsed command signal that is transmitted from the controller device to the load unit for automatically controlling the load unit while the thermostat command signal is calling for heating, cooling or refrigeration duty by the load unit, wherein the pulsed command signal comprises alternating pulse on and pulse off cycles, and a start delay time that i) precedes and delays implementation of the pulse on and pulse off cycles at the load unit and ii) controls short on cycle conditions at the load unit, wherein the start delay time is determined according to computations comprising steps (l)-(5), which comprise:
  • step (3) comparing the value of k calculated in step (2) to preselected values for a first start delay time threshold and a second start delay time threshold, wherein the first start delay time threshold is a preset single value between 0 and 1, and the second start delay time threshold is a preset single value that is between 0 and 1 and greater than the value of the first start delay time threshold,
  • step (3) determining if the start delay time value determined in step (3) lies between a predetermined delay limit minimum value (tDelayLimitMIN) and a predetermined delay limit maximum value (tDelayLimitMAX), and continuing to step (5) where such condition is satisfied; and
  • step (5) calculating on-time (tOn) and off-time to obtain at least one of a demand setpoint and an energy setpoint for a preselected temperature setpoint, using the start delay time value determined in step (3), for use in producing a pulsed command signal which is transmitted to the load unit.
  • tOn on-time
  • step (3) the start delay time value determined in step (3)
  • step (5) the start delay time value is instead increased, and that increased value of start delay time is used in step (5).
  • first start delay time threshold is a preset single value between 0.2 to 0.5
  • second start delay time threshold is a preset single value between 0.7 to 0.95.
  • first start delay time threshold is a preset single value between 0.3 to 0.4
  • second start delay time threshold is a preset single value between 0.8 to 0.9.
  • first start delay time threshold is a preset single value of 0.3
  • second start delay time threshold is a preset single value of 0.8
  • step (3) when the k value is less than the first start delay time threshold, the start delay time is decreased an amount of from about 180 seconds to about 60 seconds from a value thereof used in the most recent pulsed command signal.
  • step (3) when the k value is greater than the first start delay time threshold and less than the second start delay time threshold, the start delay time is increased an amount of from about 180 seconds to about 360 seconds from a value thereof used in the most recent pulsed command signal.
  • the load unit of the HVAC/R system comprises a compressor, a blower, or an igniter.
  • the present invention relates to an electronic controller device for automatically controlling at least one duty cycled HVAC/R equipment powered by electricity with short cycle protection, comprising:
  • the controller device intercepts a thermostat command signal in-route to the load unit and replaces the thermostat command signal with a pulsed command signal that is transmitted to the load unit for automatically controlling the load unit while the thermostat command signal is calling for heating, cooling or refrigeration duty by the load unit, wherein the transmitted pulsed command signal comprises alternating pulse on and pulse off cycles, and a start delay time that i) precedes and delays implementation of the pulse on and pulse off cycles at the load unit and ii) controls short on cycle conditions at the load unit;
  • steps l)-5 comprise 1) measuring a last on-time for the most recent pulsed command signal transmitted to the load unit from the controller device, with retrievable storing of the measured last on-time, start delay time and on-time previously computed for and used in the most recent pulsed command signal, 2) calculating a time fraction as the last measured on-time divided by the on-time previously computed, wherein the time fraction is calculated as a value between zero and one, 3) comparing the value of the time fraction calculated in step 2) to preselected values between zero and one for at least a first start delay time threshold and a second start delay time threshold having a greater value than that of the first start delay time threshold, and further wherein (i) for a first operating region where the calculated time fraction value is less than the first start delay time threshold, then the start delay time is decreased, (ii) for a second operating region where
  • the present invention further relates to an electronic controller device for automatically controlling at least one duty cycled HVAC/R equipment powered by electricity with short cycle protection, comprising:
  • the controller device intercepts a thermostat command signal in-route to the load unit and replaces the thermostat command signal with a pulsed command signal that is transmitted to the load unit for automatically controlling the load unit while the thermostat command signal is calling for heating, cooling or refrigeration duty by the load unit, wherein the transmitted pulsed command signal comprises alternating pulse on and pulse off cycles, and a start delay time that i) precedes and delays implementation of the pulse on and pulse off cycles at the load unit and ii) controls short on cycle conditions at the load unit;
  • At least one processor and at least one memory storing instructions, the instructions comprising one or more instructions which, when executed by at least one processor, cause the at least one processor to execute steps comprising steps l)-5), which comprise:
  • step 2) comparing the value of k calculated in step 2) to preselected values for a first start delay time threshold and a second start delay time threshold, wherein the first start delay time threshold is a preset single value between 0 and 1, and the second start delay time threshold is a preset single value that is between 0 and 1 and greater than the value of the first start delay time threshold,
  • step 4) determining if the start delay time value determined in step 3) lies between a predetermined delay limit minimum value (tDelayLimitMIN) and a predetermined delay limit maximum value (tDelayLimitMAX), and continuing to step 5) where such condition is satisfied;
  • step 5 calculating on-time (tOn) and off-time to obtain at least one of a demand setpoint and an energy setpoint for a preselected temperature setpoint, using the start delay time value determined in step 3), for use in production of a pulsed command signal which is transmitted to the load unit.
  • the electronic controller device of any preceding or following embodiment/feature/aspect wherein the electronic controller device is capable of intercepting a thermostat command signal in-route for at least one of a compressor, blower, or igniter, and replacing the thermostat command signal with the pulse command signal.
  • the present invention relates to a heating, ventilating, air conditioning or refrigeration (HVAC/R) system comprising a heating, ventilating, air conditioning or refrigeration unit and said electronic controller device that intercepts a thermostat control signal of said HVAC/R system and is capable of reducing or preventing short cycling of the unit.
  • HVAC/R heating, ventilating, air conditioning or refrigeration
  • BMS Building Management System
  • the present invention can include any combination of these various features or embodiments above and/or below as set forth in sentences and/or paragraphs. Any combination of disclosed features herein is considered part of the present invention and no limitation is intended with respect to combinable features.
  • Performance was evaluated as follows. A simulation of an operation of a single stage cooling system, wherein a single thermostat is used to control one compressor, such as shown in FIG. 8, was performed with an electronic controller device having a demand regulator controller of the present invention. The simulation was performed on a computer model that was developed using VisSim software, obtained from Visual Solutions of Westford, MA, USA. The developed program was adapted to simulate operation of the electronic controller that applies the process control logic shown in FIG. 7 herein. The developed model was based in part on actual data obtained from operation of the same equipment in the indicated single stage cooling configuration and with the OEM thermostat alone in the field. The simulation model is calibrated to agree with field data.
  • the time history displays the thermostat signals (uOEM) and controller control signals with the SOCC control inactive.
  • the time history displays the uOEM and controller signals with the SOCC controller active.
  • the "o" line traces are the OEM thermostat command signal (uOEM) controller signals and the "x" line traces are the controller signals (Pace Command Signal).
  • the SOCC controller increases the delay time used by the "Pace Command Signal” controller to prevent the short cycling from occurring.

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Abstract

L'invention concerne un procédé pour la commande automatique de matériel de CVCA&R qui utilise un dispositif de commande qui utilise un algorithme de protection contre les cycles de fonctionnement courts d'une manière intégrée avec des algorithmes utilisés pour ajuster le retard, le moment de mise en marche et le moment de l'arrêt d'un signal de commande en cycle envoyé à une unité de charge à partir de l'unité de commande pour atteindre des points de consigne d'énergie et/ou de demande. Une commande est fournie pour détecter et éliminer la condition de cycle de fonctionnement court. L'invention concerne également des systèmes qui comprennent le dispositif de commande assurant une protection contre les cycles de fonctionnement courts.
PCT/US2015/056309 2014-10-20 2015-10-20 Procédé pour la protection de matériel de cvca&r à cycles de charge contre des cycles de fonctionnement courts sous la commande automatique par intervention, dispositifs de commande et systèmes correspondants Ceased WO2016064782A1 (fr)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP3494347A4 (fr) * 2016-08-04 2020-04-08 Eaton Intelligent Power Limited Système de commande de charge et procédé de régulation d'alimentation d'un thermostat

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US6144906A (en) * 1998-08-06 2000-11-07 Valeo Electrical Systems, Inc. Adaptive pulse control
US20110061415A1 (en) * 2005-03-25 2011-03-17 Charles Barry Ward Condensate Pump
US20130158715A1 (en) * 2011-12-14 2013-06-20 Honeywell International Inc. Hvac controller with hvac system failure detection
WO2014152276A1 (fr) * 2013-03-15 2014-09-25 Pacecontrols Llc Organe de commande pour la commande automatique d'un équipement de cvca et r à cycle de service, et systèmes et procédés utilisant celui-ci

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Publication number Priority date Publication date Assignee Title
US6144906A (en) * 1998-08-06 2000-11-07 Valeo Electrical Systems, Inc. Adaptive pulse control
US20110061415A1 (en) * 2005-03-25 2011-03-17 Charles Barry Ward Condensate Pump
US20130158715A1 (en) * 2011-12-14 2013-06-20 Honeywell International Inc. Hvac controller with hvac system failure detection
WO2014152276A1 (fr) * 2013-03-15 2014-09-25 Pacecontrols Llc Organe de commande pour la commande automatique d'un équipement de cvca et r à cycle de service, et systèmes et procédés utilisant celui-ci

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3494347A4 (fr) * 2016-08-04 2020-04-08 Eaton Intelligent Power Limited Système de commande de charge et procédé de régulation d'alimentation d'un thermostat

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