Abstract:
Systems and methods are disclosed for incorporating manual changes to the setpoint for a thermostatic controller into long-term programming of the thermostatic controller. For example, one or more of the exemplary systems compares the actual setpoint at a given time for the thermostatic controller to an expected setpoint for the thermostatic controller in light of the scheduled programming. A determination is then made as to whether the actual setpoint and the expected setpoint are the same or different. Furthermore, a manual change to the actual setpoint for the thermostatic controller is compared to previously recorded setpoint data for the thermostatic controller. At least one rule is then applied for the interpretation of the manual change in light of the previously recorded setpoint data.

Description:
INCORPORATION BY REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application hereby incorporates herein by reference under 37 C.F.R. §1.57 the entirety of the disclosure of each application set forth in the foreign and domestic priority sections of the Application Data Sheet filed herewith. 
       BACKGROUND OF THE INVENTION 
     Field of the Invention 
       [0002]    Programmable thermostats have been available for more than 20 years. Programmable thermostats offer two types of advantages as compared to non-programmable devices. On the one hand, programmable thermostats can save energy in large part because they automate the process of reducing conditioning during times when the space is unoccupied, or while occupants are sleeping, and thus reduce energy consumption. 
         [0003]    On the other hand, programmable thermostats can also enhance comfort as compared to manually changing setpoints using a non-programmable thermostat. For example, during the winter, a homeowner might manually turn down the thermostat from 70 degrees F. to 64 degrees when going to sleep and back to 70 degrees in the morning. The drawback to this approach is that there can be considerable delay between the adjustment of the thermostat and the achieving of the desired change in ambient temperature, and many people find getting out of bed, showering, etc. in a cold house unpleasant. A programmable thermostat allows homeowners to anticipate the desired result by programming a pre-conditioning of the home. So, for example, if the homeowner gets out of bed at 7 AM, setting the thermostat to change from the overnight setpoint of 64 degrees to 70 at 6 AM can make the house comfortable when the consumer gets up. The drawback to this approach is that the higher temperature will cost more to maintain, so the increase in comfort is purchased at the cost of higher energy usage. 
         [0004]    But all of the advantages of a programmable thermostat depend on the match between the preferences of the occupants and the actual settings employed. If, for example, the thermostat is set to warm up the house on winter mornings at 7 AM, but the homeowner gets up at 5:30, the homeowner is likely to be dissatisfied. If a homeowner has programmed her thermostat to cool down the house at 5 PM each afternoon based on the assumption that she will come home at 6 PM, but her schedule changes and she begins to arrive home at 4:30 each day, she is likely to be uncomfortable and either make frequent manual changes or go through the generally non-intuitive process of reprogramming the thermostat to match her new schedule. Because the limited interface on most thermostats, that process may take considerable effort, which leads many users to avoid reprogramming their thermostats for long periods or even to skip doing so entirely. 
         [0005]    But even if a homeowner is able to align her schedule with the programming of her thermostat, there are additional difficulties associated with choosing proper temperatures at those times. If the temperatures programmed into a thermostat do not accurately reflect the preferences of the occupants, those occupants are likely to resort to manual overrides of the programmed settings. The need to correct the “mistakes” of the thermostat is likely to annoy many users. And because people tend to overshoot the desired temperature when they make such manual changes, these overrides are likely to result in excessive heating and cooling, and thus unnecessary energy use. That is, if a person feels uncomfortable on a summer afternoon when the setting is 73 degrees, they are likely to change it to 68 or 69 rather than 71 or 72 degrees, even if 72 degrees might have made enough of a difference. 
         [0006]    It would therefore be advantageous to have a means for adapting to signaling from occupants in the form of manual temperature changes and incorporating the information contained in such gestures into long-term programming. It would also be desirable to take into account both outside weather conditions and the thermal characteristics of individual homes in order to improve the ability to dynamically achieve the best possible balance between comfort and energy savings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]      FIG. 1  shows an example of an overall environment in which an embodiment of the invention may be used. 
           [0008]      FIG. 2  shows a high-level illustration of the architecture of a network showing the relationship between the major elements of one embodiment of the subject invention. 
           [0009]      FIG. 3  shows an embodiment of the website to be used as part of the subject invention. 
           [0010]      FIG. 4  shows a high-level schematic of the thermostat used as part of the subject invention. 
           [0011]      FIG. 5  shows one embodiment of the database structure used as part of the subject invention. 
           [0012]      FIGS. 6A and 6B  show how comparing inside temperature against outside temperature and other variables permits calculation of dynamic signatures. 
           [0013]      FIG. 7  shows how manual inputs can be recognized and recorded by the subject invention. 
           [0014]      FIG. 8  shows how the subject invention uses manual inputs to interpret manual overrides and make short-term changes in response thereto. 
           [0015]      FIG. 9  shows how the subject invention uses manual inputs to alter long-term changes to interpretive rules and to setpoint scheduling. 
           [0016]      FIG. 10  shows an example of some of the contextual data that may be used by the server in order to interpret manual overrides. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0017]      FIG. 1  shows an example of an overall environment  100  in which an embodiment of the invention may be used. The environment  100  includes an interactive communication network  102  with computers  104  connected thereto. Also connected to network  102  are one or more server computers  106 , which store information and make the information available to computers  104 . The network  102  allows communication between and among the computers  104  and  106 . 
         [0018]    Presently preferred network  102  comprises a collection of interconnected public and/or private networks that are linked to together by a set of standard protocols to form a distributed network. While network  102  is intended to refer to what is now commonly referred to as the Internet, it is also intended to encompass variations which may be made in the future, including changes additions to existing standard protocols. 
         [0019]    One popular part of the Internet is the World Wide Web. The World Wide Web contains a large number of computers  104  and servers  106 , which store HyperText Markup Language (HTML) and other documents capable of displaying graphical and textual information. HTML is a standard coding convention and set of codes for attaching presentation and linking attributes to informational content within documents. 
         [0020]    The servers  106  that provide offerings on the World Wide Web are typically called websites. A website is often defined by an Internet address that has an associated electronic page. Generally, an electronic page is a document that organizes the presentation of text graphical images, audio and video. 
         [0021]    In addition to the Internet, the network  102  can comprise a wide variety of interactive communication media. For example, network  102  can include local area networks, interactive television networks, telephone networks, wireless data systems, two-way cable systems, and the like. 
         [0022]    Network  102  can also comprise servers  106  that provide services other than HTML documents. Such services may include the exchange of data with a wide variety of “edge” devices, some of which may not be capable of displaying web pages, but that can record, transmit and receive information. 
         [0023]    In one embodiment, computers  104  and servers  106  are conventional computers that are equipped with communications hardware such as modem or a network interface card. The computers include processors such as those sold by Intel and AMD. Other processors may also be used, including general-purpose processors, multi-chip processors, embedded processors and the like. 
         [0024]    Computers  104  can also be handheld and wireless devices such as personal digital assistants (PDAs), cellular telephones and other devices capable of accessing the network. 
         [0025]    Computers  104  may utilize a browser configured to interact with the World Wide Web. Such browsers may include Microsoft Explorer, Mozilla, Firefox, Opera or Safari. They may also include browsers used on handheld and wireless devices. 
         [0026]    The storage medium may comprise any method of storing information. It may comprise random access memory (RAM), electronically erasable programmable read only memory (EEPROM), read only memory (ROM), hard disk, floppy disk, CD-ROM, optical memory, or other method of storing data. 
         [0027]    Computers  104  and  106  may use an operating system such as Microsoft Windows, Apple Mac OS, Linux, Unix or the like. 
         [0028]    Computers  106  may include a range of devices that provide information, sound, graphics and text, and may use a variety of operating systems and software optimized for distribution of content via networks. 
         [0029]      FIG. 2  illustrates in further detail the architecture of the specific components connected to network  102  showing the relationship between the major elements of one embodiment of the subject invention. Attached to the network are thermostats  108  and computers  104  of various users. Connected to thermostats  108  are HVAC units  110 . The HVAC units may be conventional air conditioners, heat pumps, or other devices for transferring heat into or out of a building. Each user may be connected to server  106  via wired or wireless connection such as Ethernet or a wireless protocol such as IEEE 802.11, and router and/or gateway or wireless access point  112  that connects the computer and thermostat to the Internet via a broadband connection such as a digital subscriber line (DSL) or other form of broadband connection to the World Wide Web. In one embodiment, thermostat management server  106  is in communication with the network  102 . Server  106  contains the content to be served as web pages and viewed by computers  104 , as well as databases containing information used by the servers, and applications used to remotely manage thermostats  108 . 
         [0030]    In the currently preferred embodiment, the website  200  includes a number of components accessible to the user, as shown in  FIG. 3 . Those components may include a means to store temperature settings  202 , a means to enter information about the user&#39;s home  204 , a means to enter the user&#39;s electricity bills  206 , and means to elect to enable the subject invention  208 . 
         [0031]      FIG. 4  shows a high-level block diagram of thermostat  108  used as part of the subject invention. Thermostat  108  includes temperature sensing means  252 , which may be a thermistor, thermal diode or other means commonly used in the design of electronic thermostats. It includes a microprocessor  254 , memory  256 , a display  258 , a power source  260 , and at least one relay  262 , which turns the HVAC system on and off in response to a signal from the microprocessor, and contacts by which the relay is connected to the wires that lead to the HVAC system. To allow the thermostat to communicate bi-directionally with the computer network, the thermostat also includes means  264  to connect the thermostat to a local computer or to a wired or wireless network. Such means could be in the form of Ethernet, wireless protocols such as IEEE 802.11, IEEE 802.15.4, Bluetooth, or other wireless protocols. The thermostat may be connected to the computer network directly via wired or wireless Internet Protocol connection. Alternatively, the thermostat may connect wirelessly to a gateway such as an IP-to-Zigbee gateway, an IP-to-Z-wave gateway, or the like. Where the communications means enabled include wireless communication, antenna  266  will also be included. The thermostat  250  may also include controls  268  allowing users to change settings directly at the thermostat, but such controls are not necessary to allow the thermostat to function. 
         [0032]    The data used to generate the content delivered in the form of the website and to automate control of thermostat  108  is stored on one or more servers  106  within one or more databases. As shown in  FIG. 5 , the overall database structure  300  may include temperature database  400 , thermostat settings database  500 , energy bill database  600 , HVAC hardware database  700 , weather database  800 , user database  900 , transaction database  1000 , product and service database  1100  and such other databases as may be needed to support these and additional features. 
         [0033]    The website will allow users of connected thermostats  108  to create personal accounts. Each user&#39;s account will store information in database  900 , which tracks various attributes relative to users. Such attributes may include the make and model of the specific HVAC equipment in the user&#39;s home; the age and square footage of the home, the solar orientation of the home, the location of the thermostat in the home, the user&#39;s preferred temperature settings, etc. 
         [0034]    As shown in  FIG. 3 , the website  200  will permit thermostat users to perform through the web browser substantially all of the programming functions traditionally performed directly at the physical thermostat, such as temperature set points, the time at which the thermostat should be at each set point, etc. Preferably the website will also allow users to accomplish more advanced tasks such as allow users to program in vacation settings for times when the HVAC system may be turned off or run at more economical settings, and set macros that will allow changing the settings of the temperature for all periods with a single gesture such as a mouse click. 
         [0035]    In addition to using the system to allow better signaling and control of the HVAC system, which relies primarily on communication running from the server to the thermostat, the bi-directional communication will also allow the thermostat  108  to regularly measure and send to the server information about the temperature in the building. By comparing outside temperature, inside temperature, thermostat settings, cycling behavior of the HVAC system, and other variables, the system will be capable of numerous diagnostic and controlling functions beyond those of a standard thermostat. 
         [0036]    For example,  FIG. 6   a  shows a graph of inside temperature, outside temperature and HVAC activity for a 24-hour period. When outside temperature  302  increases, inside temperature  304  follows, but with some delay because of the thermal mass of the building, unless the air conditioning  306  operates to counteract this effect. When the air conditioning turns on, the inside temperature stays constant (or rises at a much lower rate or even falls) despite the rising outside temperature. In this example, frequent and heavy use of the air conditioning results in only a very slight temperature increase inside the house of 4 degrees, from 72 to 76 degrees, despite the increase in outside temperature from 80 to 100 degrees. 
         [0037]      FIG. 6   b  shows a graph of the same house on the same day, but assumes that the air conditioning is turned off from noon to 7 PM. As expected, the inside temperature  304   a  rises with increasing outside temperatures  302  for most of that period, reaching 88 degrees at 7 PM. Because server  106  logs the temperature readings from inside each house (whether once per minute or over some other interval), as well as the timing and duration of air conditioning cycles, database  300  will contain a history of the thermal performance of each house. That performance data will allow server  106  to calculate an effective thermal mass for each such structure—that is, the speed with the temperature inside a given building will change in response to changes in outside temperature. Because the server will also log these inputs against other inputs including time of day, humidity, etc. the server will be able to predict, at any given time on any given day, the rate at which inside temperature should change for given inside and outside temperatures. 
         [0038]    The ability to predict the rate of change in inside temperature in a given house under varying conditions may be applied by in effect holding the desired future inside temperature as a constraint and using the ability to predict the rate of change to determine when the HVAC system must be turned on in order to reach the desired temperature at the desired time. 
         [0039]    In order to adapt programming to take into account the manual overrides entered into the thermostat, it is first necessary to determine when a manual override has in fact occurred. Most thermostats, including two-way communicating devices discussed herein, do not record such inputs locally, and neither recognize nor transmit the fact that a manual override has occurred. Furthermore, in a system as described herein, frequent changes in setpoints may be initiated by algorithms running on the server, thereby making it impossible to infer a manual override from the mere fact that the setpoint has changed. It is therefore necessary to deduce the occurrence of such events from the data that the subject invention does have access to. 
         [0040]      FIG. 7  illustrates the currently preferred method for detecting the occurrence of a manual override event. In step  1002 , the server retrieves the primary data points used to infer the occurrence of a manual override from one or more databases in overall database structure  300 . The data should include each of the following: for the most recent point for which it can obtain such data (time 0 ) the actual setpoint as recorded at the thermostat (A 0 ); for the point immediately prior to time 0 , (time- 1 ), the actual setpoint recorded for the thermostat (A- 1 ); for time 0  the setpoint as scheduled by server  106  according to the standard setpoint programming (S 0 ), and for time 0  the setpoint as scheduled by server  106  according to the standard setpoint programming (S- 1 ). In step  1004 , the server retrieves any additional automated setpoint changes C that have been scheduled for the thermostat by server  106  at time 0 . Such changes may include algorithmic changes intended to reduce energy consumption, etc. In step  1006  the server calculates the difference (dA) between A 0  and A- 1 ; for example, if the setpoint at T 0  is 67 degrees at T- 1  and 69 at T 0 , dA is +2; if the setpoint at T- 1  is 70 and the setpoint at T 0  is 66, dA is −4. In step  1008 , the server performs similar steps in order to calculate dS, the difference between S 0  and S- 1 . This is necessary because, for example, the setpoint may have been changed because the server itself had just executed a change, such as a scheduled change from “away” to “home” mode. In step  1010  the server evaluates and sums all active algorithms and other server-initiated strategies to determine their net effect on setpoint at time 0 . For example, if one algorithm has increased setpoint at time 0  by 2 degrees as a short-term energy savings measure, but another algorithm has decreased the setpoint by one degree to compensate for expected subjective reactions to weather conditions, the net algorithmic effect sC is +1 degree. 
         [0041]    In step  1012 , the server calculates the value for M, where M is equal to the difference between actual setpoints dA, less the difference between scheduled setpoints dS, less the aggregate of algorithmic change sC. In step  1014  the server evaluates this difference. If the difference equals zero, the server concludes that no manual override has occurred, and the routine terminates. But if the difference is any value other than zero, then the server concludes that a manual override has occurred. Thus in step  1016  the server logs the occurrence of an override to one or more databases in overall database structure  300 . 
         [0042]    The process of interpreting a manual override is shown in  FIG. 8. 1102  is the detection of an override, as described in detail in  FIG. 7  In step  1104  the server retrieves contextual data required to interpret the manual override. Such data may include current and recent weather conditions, current and recent inside temperatures, etc. This data is helpful because it is likely that manual overrides are at least in part deterministic: that is, that they may often be explained by such contextual data, and that such understanding can permit anticipation of the desire on the part of the occupants to override and to adjust programming accordingly, so as to anticipate and obviate the need for such changes. In step  1106  the server retrieves any override data from the period preceding the specific override being evaluated that has not yet been evaluated by and incorporated into the long-term programming and rules engines as described below in  FIG. 9 . The amount of data may be for a period of a few hours to as long as several days or more. Recent data will be more heavily weighted than older data in order to assure rapid adaptation to situations in which manual overrides represent stable changes such as changes in work schedules, etc. In step  1108  the server retrieves the stored rules for the subject thermostat  108 . Such rules may include weather and time-related inferences such as “if outside temperature is greater than 85 degrees and inside temperature is more than 2 degrees above setpoint and manual override lowers setpoint by 3 or more degrees, then revert to original setpoint in 2 hours,” or “if heating setpoint change is scheduled from “away” to “home” within following 2 hours after detected override, and override increases setpoint by at least 2 degrees, then change to “home” setting,” or the like. In step  1110  the server applies the rules to the override and determines which rule, if any, should be applied as a result of the override. In step  1112  the server determines whether to alter the current setpoint as a result of applying the rules in step  1110 . If no setpoint change is indicated, then the server proceeds to step  1118 . If a setpoint change is indicated, then in step  1114  the server transmits the setpoint change to the thermostat, and in step  1116  it records that change to one or more databases in overall database structure  300 . 
         [0043]    In order to ensure that both the stored rules for interpreting manual overrides and the programming itself continue to most accurately reflect the intentions of the occupants, the server will periodically review both the rules used to interpret overrides and the setpoint scheduling employed.  FIG. 9  shows the steps used to incorporate manual overrides into the long-term rules and setpoint schedule. In step  1202  the server retrieves the stored programming for a given thermostat as well as the rules for interpreting overrides for that thermostat. In step  1204  the server retrieves the recent override data as recorded in  FIGS. 7 and 8  to be evaluated for possible revisions to the rules and the programming. In step  1206  the server retrieves the contextual data regarding overrides retrieved in step  1204  (Because the process illustrated in  FIG. 9  is not presently expected to be executed as a real-time process, and to be run anywhere from once per day to once per month, the range and volume of contextual data to be evaluated is likely to be greater than in the process illustrated in  FIG. 8 ). In step  1208  the server interprets the overrides in light of the existing programming schedule, rules for overrides, contextual data, etc. In step  1210  the server determines whether, as a result of those overrides as interpreted, the rules for interpreting manual overrides should be revised. If the rules are not to be revised, the server moves to step  1214 . If the rules are to be revised, then in step  1212  the server revises the rules and the new rules are stored in one or more databases in overall database structure  300 . In step  1214  the server determines whether any changes to the baseline programming for the thermostat should be revised. If not the routine terminates. If revisions are warranted, then in step  1216  the server retrieves from database  900  the permissions the server has to make autonomous changes to settings. If the server has been given permission to make the proposed changes, then in step  1218  the server revises the thermostat&#39;s programming and writes the changes to one or more databases in overall database structure  300 . If the server has not been authorized to make such changes autonomously, then in step  1220  the server transmits the recommendation to change settings to the customer in the manner previously specified by the customer, such as email, changes to the customer&#39;s home page as displayed on website  200 , etc. 
         [0044]      FIG. 10  shows an example of some of the contextual data that may be used by the server in order to interpret manual overrides. Such data may include inside temperature  1302 , outside temperature  1304 , cloud cover  1306 , humidity  1308 , barometric pressure  1310 , wind speed  1312 , and wind direction  1314 . 
         [0045]    Each of these data points should be captured at frequent intervals. In the preferred embodiment, as shown in  FIG. 10 , the interval is once every 60 seconds. 
         [0046]    Additional means of implementing the instant invention may be achieved using variations in system architecture. For example, much or even all of the work being accomplished by remote server  106  may also be done by thermostat  108  if that device has sufficient processing capabilities, memory, etc. Alternatively, some or all of these steps may be undertaken by a local processor such as a local personal computer, gateway  112 , or by a dedicated appliance having the requisite capabilities. 
         [0047]    While certain embodiments of the inventions have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.