Algorithm for detecting overheating from an external temperature measurement

Abstract

Method for managing a home automation installation (100) of a building (1) comprising a motorized solar protection (3), a management unit (102) for a position taken by the solar protection (3), a control device (104) comprising at least one sensor for measuring an external temperature (202) in the building (1) and a means for determining brightness (220), the method comprising: A step (E1) of measuring the values ​​of external temperature (T) and brightness (L) are recorded; A step (E2) of analyzing the brightness values ​​to determine a period of low brightness (pn), A step (E3) of determining the minimum (Tmin) and maximum (Tmax) external temperatures over the period of low brightness (pn); A step (E4) of controlling over a period of high brightness the position taken by the solar protection (3) as a function of the minimum (Tmin) and maximum (Tmax) external temperatures. Figure 6

Description

Title of the invention: Algorithm for detecting overheating from an external temperature measurement

[0001] The invention relates to the field of managing thermal comfort inside a building and more particularly to a method for managing a home automation installation and a terminal of a home automation installation.

[0002] A building for domestic or professional use has a set of active elements, such as air conditioning or heating devices, or passive elements, such as for example solar protection such as roller shutters or blinds, or openings allowing natural ventilation to be managed, the behavior of which, in particular by means of automatic control, has a strong influence on a change in thermal comfort, that is to say an interior temperature of the building, and interior visual comfort.

[0003] Several phenomena can influence thermal comfort in the building, in particular: - external climatic conditions, including direct solar radiation or irradiance from external objects, the external temperature, through their impact on the external envelope of the building, cause the internal temperature to change with greater or lesser inertia. The latter varies in particular depending on the construction materials, the insulation of the building, the orientation of the openings, and the geometry of the building; - air conditioning and heating systems can also change the interior temperature of the building, in particular by compensating, upwards or downwards, for energy inputs from other energy sources; - activities carried out inside the building, such as operating an oven or a fireplace, or the presence of a large number of people, etc., also significantly change the temperature inside the building.

[0004] Among these phenomena, irradiance and more precisely solar radiation transmitted through glazing of an opening in the building is one of the predominant components of an increase in the interior temperature.

[0005] Thus, a control of solar protections, that is to say a command to open or close the solar protection, by interacting directly with the exterior has a direct and significant impact on thermal and visual comfort, with a very limited energy expenditure to ensure this control. In other words, good management of solar protection allows the interior temperature of the building to be varied by several degrees.

[0006] Controlling or managing a solar protection is defined as a modification of the positions of the solar protection over time between a deployed or unrolled position in which it stops at least part of the solar radiation, and a folded or rolled-up position in which it stops a less significant part of the solar radiation.

[0007] Manual control, or management, is not optimal from an energy point of view because it is difficult for a building occupant to know exactly what the ideal position of the solar protection is at any given moment, and when to open or close it. In addition, if the building is unoccupied, movements are impossible, unlike automatic control which continuously ensures the positioning of the protections. It is therefore important to be able to manage automatic control optimally, in particular to limit the increase in the interior temperature.

[0008] Solutions are known that implement automated management or control of solar protections to limit the increase in the interior temperature using a set of sensors, for example interior or exterior brightness sensors, a twilight clock linked to a home automation system, weather forecasts and / or thermal settings of the building. In particular, patent EP2682825 proposes a method for determining the climatic conditions of a coming day from the temperature outside the building recorded at the time of sunrise. The climatic conditions are determined for the day based on a comparison of this exterior temperature obtained at sunrise with different thresholds. This method thus makes it possible to determine winter, autumn, spring or summer climatic conditions.Solar protection management is adapted to prioritize or limit solar input to the right level depending on the determined climatic conditions, in particular depending on a season determined from this outside temperature at sunrise. The collection of data and the comparison with predefined thresholds to determine seasonal conditions is simple but not very precise in identifying the conditions leading to an overheating situation during the day.

[0009] An overheating situation is defined as a situation in the building in which the interior temperature becomes higher than a maximum value of a comfort temperature range.

[0010] The invention aims to remedy all or part of the aforementioned drawbacks by proposing a method for managing a home automation installation of a building comprising at least one motorized solar protection, a management unit of a position taken by the solar protection over time, and at least one control device comprising at least one sensor for measuring a temperature outside the building and a means for determining brightness, the method being implemented by the management unit and comprising:

[0011] The invention relates to a method for managing a home automation installation of a building comprising at least one motorized solar protection, a unit for managing a position taken by the solar protection over time, and at least one control device comprising at least one sensor for measuring a temperature outside the building and a means for determining brightness, the method being implemented by the control device located at least partly outside the building and comprising: - A measurement step in which outside temperature and brightness values ​​are recorded; - An analysis step in which the brightness values ​​recorded make it possible to determine at least one period of low brightness, - A step to determine the minimum and maximum outside temperatures over the low light period; - A control step over a period of high light, intended for the management unit, of the position taken by the solar protection according to the minimum and maximum external temperatures recorded over the period of low light, said period of high light being successive to the period of low light.

[0012] A period of low light corresponds for example to a night period. The period of low light is determined by an analysis of the outdoor light measurements carried out. It is considered that during the period of low light, the outdoor temperature measuring sensor is not influenced by solar radiation, or direct solar radiation and is therefore more reliable, and this independently of the location of the control device, likely or not to receive direct solar radiation, on a facade of the building.

[0013] Recording the outside temperature values ​​during periods of low light therefore makes it possible to overcome the biases introduced by direct or indirect solar radiation on the temperature measuring device, which require complex processing or which introduce errors.

[0014] For example, the low light period may be defined as the period during which the outdoor brightness measured by the brightness determining means is below a night threshold for at least a portion of the low light period.

[0015] The method is based on the principle that an upcoming overheating situation, i.e. over the period of high brightness following the period of low brightness, corresponds to a situation in the building for which night-time temperature extrema, i.e. over the period of low brightness, are higher than predetermined threshold values. These predetermined threshold values ​​are, for example, chosen to be equivalent to a minimum of a thermal comfort temperature range in the building. In other words, an overheating situation during the day is likely when the night-time outside temperature has not fallen below said predetermined thresholds.

[0016] The method according to the invention thus comprises a measuring step during which the outside temperature is measured and recorded over time during the period of low light. Preferably, these temperatures are recorded in a memory of the control device.

[0017] The method comprises a determination step in which a mathematical analysis of these temperatures is carried out, in particular so as to determine a minimum and a maximum. Other mathematical analyses are possible in addition, such as for example a sliding average of the temperature minima / maxima over several days.

[0018] The brightness measurement makes it possible on the one hand to determine the period of low brightness for taking into account the temperatures adapted to the determination of the extrema, but also to determine the end of this period of low brightness, characteristic of the start of a period of high brightness or day, during which a command can be issued.

[0019] According to one embodiment, the control step is a function of the brightness measured over the period of high brightness.

[0020] Thus, the control of the position taken by the solar protection is adapted according to the measured brightness. The control therefore adapts in real time to the external brightness so as to minimize a risk of reaching an overheating situation in the building while allowing good consideration of visual comfort for the users of the building.

[0021] The method therefore contributes to limiting overheating situations in the building by appropriate early closing of the solar protections to limit heat inputs when appropriate. In particular, the method aims to maintain the interior temperature in the building within a comfort temperature range. Such a comfort temperature is generally within the interval [16°, 30°], for example the interval [19°, 27°], preferably the interval [21°, 26°].

[0022] According to one embodiment, the low light period is defined for brightness values ​​less than 300 lux.

[0023] The distinction of a low light period or night is based on a value of very low brightness. A threshold value of 300 lux allows the vast majority of nighttime light environments to be taken into account.

[0024] According to one embodiment, a succession of values ​​of the outside temperature over the period of low light is recorded by sampling measurements of the outside temperature over the period of low light.

[0025] The outside temperature is influenced by different phenomena. Thus, it is not sufficient to use a single temperature value as a representative marker of a night-time situation. On the other hand, we want to be able to limit the resources required for the calculation and it is therefore preferable to avoid an analysis of the variation of the outside temperature during the entire period of low light.

[0026] In order for the method to be easy to implement, it thus performs the detection of the probability of overheating on the basis of temperature information, in particular nighttime outside temperature, and possibly brightness information. More precisely, to minimize energy consumption of the control device, the temperature information comes from a succession of outside temperature measurements spaced apart by a sampling time interval, the latter preferably being between Oh and Ih, for example 15 minutes, during a period characterized by low brightness, in other words during the night.

[0027] In other words, the temperature measurement is carried out periodically, following a sampling period.

[0028] According to one embodiment, the method comprises updating a first time counter associated with the low light period and a second time counter associated with the high light period.

[0029] This makes it possible to distinguish between sustained low-light or high-light situations and false detections of occasional low-light or high-light situations. This also ensures the consecutive nature of a low-light period and a high-light period and the temporal relevance of the temperature measurements taken into account for determining the control.

[0030] According to one embodiment, the method comprises a step of determining a reactivity coefficient.

[0031] Advantageously, the method makes it possible to determine a reactivity coefficient of the installation to be applied during the day during the control step. The reactivity coefficient depends on the night-time temperature readings, this reactivity coefficient notably reflecting a reactivity of the installation to modify the position taken by the solar protections over time and / or a reaction amplitude, i.e. a level of closure of the solar protections, of the installation faced with a current or future overheating situation.

[0032] The coefficient of reactivity is determined on the basis of temperature information and in particular the mathematical analysis of these temperatures during the low light period.

[0033] According to one embodiment, the reactivity coefficient is determined based on a comparison of the maximum outside temperature recorded with a first threshold and a comparison of the minimum outside temperature with a second threshold.

[0034] More precisely, the reactivity coefficient is determined based on a comparison of the maximum outside temperature recorded with a first threshold and a comparison of the minimum outside temperature with a second threshold distinct from the first threshold. The reactivity of the installation thus depends on the temperature extremes determined previously and on temperature thresholds predefined for the installation.

[0035] According to one embodiment, the solar protection takes an at least partially deployed position when, on the one hand, the determined reactivity coefficient is associated with a movement command and, on the other hand, when the measured brightness value exceeds a brightness threshold, said brightness threshold being associated with the determined reactivity coefficient.

[0036] The position taken by the solar protection of the installation thus depends on the temperature extrema previously determined via the reactivity coefficient, and on the ambient brightness.

[0037] According to one embodiment, the reactivity coefficient corresponds to at least one brightness threshold from which a solar protection movement command will take place.

[0038] In particular, a low reactivity coefficient, not causing any command, does not correspond to any brightness threshold or to a very high brightness threshold well above 60,000 lux.

[0039] An average reactivity coefficient corresponds for example to an average brightness threshold around 25,000 lux.

[0040] A high reactivity coefficient corresponds to a low brightness threshold, for example around 3000 lux.

[0041] In other words, an order can take place as soon as the measured brightness is greater than this brightness threshold.

[0042] According to one embodiment, the method comprises a step of determining a position coefficient.

[0043] Advantageously, the method makes it possible to determine a position coefficient of the installation during the day, for example based on night-time temperature readings. This position coefficient notably reflects an adaptation of the control of the position taken by the solar protection of the installation in anticipation of an overheating situation. More particularly, the position coefficient corresponds to a level of closure of the solar protections, for example a closing percentage.

[0044] According to one embodiment, the position coefficient is determined as a function of a comparison of the brightness measured over the period of high brightness with at least one brightness threshold and as a function of the comparison of the maximum temperature recorded with a first position threshold or of a comparison of the minimum temperature with a second position threshold.

[0045] The adaptation of the installation thus depends on the temperature extremes determined previously and the ambient brightness. A position command taken by the solar protection can thus be issued during changes in ambient brightness throughout the period of high brightness.

[0046] According to one embodiment, the first position threshold is equal to the first threshold and / or the second position threshold is equal to the second threshold.

[0047] According to one embodiment, the position coefficient is determined as a function of a thermo-visual index representing a weighting between thermal comfort and visual comfort, preselected by a user of the home automation installation.

[0048] The adaptation of the installation thus depends on a configuration of the installation, corresponding to the wishes of a user of the installation.

[0049] The management method according to the invention can operate independently, or in conjunction with another overheating management method implemented independently and possibly based on other criteria.

[0050] The management method according to the invention makes it possible to take into account different scenarios or probabilities of overheating and to assign, as a function of these different scenarios or probabilities, a reactivity coefficient and / or an adapted position coefficient. The method therefore participates proactively and dynamically in preventing overheating situations in a building, in particular during a summer season.

[0051] The invention also relates to a device for controlling a home automation installation of a building implementing a management method according to the invention, comprising an outside temperature measurement sensor and a means for determining brightness, the control device comprising an electronic control unit comprising a communication unit and a controller.

[0052] The particular interest of this method is to rely mainly on a control device arranged outside a building, comprising both a temperature measuring sensor and a brightness determination means. Alternatively, the temperature and brightness values ​​are provided by two separate and distinct measuring devices, making it possible to collect temperature and brightness data outside the building.

[0053] According to one embodiment, the device comprises a photovoltaic panel and a rechargeable battery powering the control device, the device control being adapted to be fixed on a facade outside the building, the photovoltaic panel being adapted to recharge the battery.

[0054] The control device is thus energy autonomous. It can also be completely disconnected from an external data network and therefore operate solely on the basis of the data it measures.

[0055] According to one embodiment, the means for determining brightness is a measurement of the current supplied by the photovoltaic panel to the rechargeable battery.

[0056] Thus the control device is simple and independent of a physical sensor specifically provided for measuring brightness.

[0057] The invention will be better understood, thanks to the following description, which relates to several embodiments according to the present invention, given as non-limiting examples and explained with reference to the appended schematic drawings, in which:

[0058] [Fig. 1] is a schematic representation of a building comprising a home automation installation implementing a method in accordance with the invention;

[0059] [Fig.2] is a schematic cross-section of a solar protection of the home automation installation of [Fig.l];

[0060] [Fig.3] is a schematic perspective view of the sun protection illustrated in [Fig.2];

[0061] [Fig.4] is a perspective view from below of a control device for implementing a method according to the invention;

[0062] [Fig.5] is a partially exploded top view of the control device of [Fig.5];

[0063] [Fig.6] is an illustration of a method according to the invention;

[0064] [Fig.7] represents a table of conditions used in an embodiment of the method according to the invention

[0065] [Fig.8] represents a table of conditions used in an alternative embodiment of the method according to the invention.

[0066] The solution proposed here relates to automatic management of a position of solar protection over time, making it possible to act on the thermal comfort of an area of ​​a building.

[0067] As illustrated in [Fig.l], a building 1 comprises a home automation installation 100 comprising motorized solar protection 3. The home automation installation 100 comprises a management unit 102 of a position taken by the solar protection 3 over time.

[0068] The installation also comprises at least one control device 104 of a home automation installation. Air conditioning and heating devices 106 may also be present in the area of ​​the building.

[0069] The solar protection 3 is installed outside or inside the building, in particular near an opening 108 of the building. An opening 108 is for example a window, a French window or a glass door. The solar protection is advantageously an interior or exterior blind made of canvas or provided with adjustable slats. The present invention, however, applies to all types of solar protection.

[0070] As shown in Figures 2 and 3, the sun protection 3 comprises a canvas 2 fixed by one of its ends to a winding shaft 4, arranged inside a box 9 and driven by an electromechanical actuator 5, and by the other end to a weighted bar 8. The sun protection 3, and more particularly the canvas 2 is movable between a rolled up or folded position, in particular high, in which the canvas 2 uncovers the opening 108 at the level of which the sun protection is positioned, and an unrolled or deployed position, in particular low, in which the canvas 2 covers the opening and thus at least partially blocks the solar radiation through the opening 108. The deployment of the canvas 2 can be guided by slides 6.

[0071] In a known manner, the electromechanical actuator 5 is fixed to a supporting structure 9 linked to the building 1 and inserted into the tube-shaped winding shaft 4 to drive the latter in rotation so as to unwind or wind the canvas 2.

[0072] In the case of a slatted blind type sun protection, the different slats of the blind are preferably suspended via cords intended to be wound onto the winding shaft or unwound from the winding shaft so as to fold or unfold the screen.

[0073] The electromechanical actuator 5 is controlled by a local control unit 12 which may be provided with an antenna 12a. The local control unit 12 takes the form of a wall switch, or a remote control.

[0074] The installation 100 may also comprise a central control unit 13 which may be provided with an antenna 13a, which acts as a gateway between the installation 100 and an Internet network external to the installation. The control device 104 may be a local control unit 12 or a central control unit 13, or a set of a local control 12 and a central control 13.

[0075] The electromechanical actuator 5 is configured to execute movement commands, in particular deployment or retraction, of the solar protections 3, the commands being able to be issued, in particular, by the local control unit 12 or the central control unit 13, which are part of the installation 100.

[0076] The electromechanical actuator 5 comprises an electric motor 10 and an electronic control unit 15 capable of operating the electric motor 10 of the electromechanical actuator 5, and, in particular, enabling the electric motor 10 to be supplied with electrical energy.

[0077] The electromechanical actuator 5 may comprise a connection to a mains power source or may comprise a stand-alone electrical power supply device, such as for example the photovoltaic panel 206 and / or an electrical energy storage device such as the rechargeable battery 204.

[0078] The electronic control unit 15 comprises a communication module, in particular for receiving control orders, the control orders being transmitted by the local control unit 12 or the central control unit 13, for example by means of radio control orders.

[0079] A remote control 14, which may be a type of local control unit, and provided with a control keyboard, which comprises selection and possibly display means, furthermore allows a user to intervene on the electromechanical actuator 5 and / or the local control unit 12 and / or central control unit 13.

[0080] The control device 104 of the home automation installation makes it possible to act on a solar protection installed outside or inside a room of the building 1, that is to say outside or inside a room of the building 1 comprising at least one opening 108 which may be masked or not or partially by the solar protection 3. The control device 104 may be distributed over several control units installed outside and / or inside the building, such as one or more local 12 and / or central 13 control units. In particular, the control device 104 comprises an external device 200.

[0081] As shown in Figures 4 and 5, the external device 200 comprises a housing 208 comprising a base 209 and a translucent cover 210 attached to the base. The base 209 is provided with fixing means 212, making it possible to fix it to a wall of the building 1, in particular outside the building 1. The base 209 also incorporates connection pins 214.

[0082] The control device 104 and more particularly the external device 200, comprises at least one temperature measurement sensor 202, a brightness determination means 220 and at least one electronic control unit 222, in the form of a printed circuit, comprising a communication unit 224 and a controller 226, such as a microprocessor. The electronic control unit 222 comprises hardware and software means, for example the control device 104 also comprises a time counter 228, a memory 230 in which external temperature data T can be stored at substantially regular intervals over a predefined period, for example over 24 hours, as well as a program for mathematical analysis of these external temperature data T. In particular, the control device 104 does not require a precise clock, but a simple time counter is sufficient to define the regularity of the measurement readings.

[0083] The connection pins 214 are connected to the electronic control unit and allow this to be configured from the base 209 of the external box 200.

[0084] The control device 104 also comprises a rechargeable battery 204 for powering the device and a photovoltaic panel 206 connected to the rechargeable battery 104 and adapted to recharge the latter.

[0085] Thus, the photovoltaic panel 206, placed at the rear of the translucent cover 210, can be exposed to solar radiation to recharge the rechargeable battery 104.

[0086] The brightness determination means 220 makes it possible to determine a degree of ambient brightness in the exterior environment of the building.

[0087] The brightness determination means 200 may be a physical sensor, comprising for example a photodiode, a luxmeter, or be composed of one or more cells of the photovoltaic panel 206. The brightness determination means 220 may also be a so-called virtual sensor whose captured information is provided by an external weather station.

[0088] The external device 200 is advantageously placed outside the building and functions as a weather station insofar as it includes in particular the external temperature measuring sensor(s) 202 as well as the brightness determination means 220. The external device 200 can also be adapted to measure other parameters, for example a wind speed or the presence of rain. The communication unit 224 of the control device 104 is also adapted to receive information relating to weather forecasts, for example via a connection to an Internet network.

[0089] The control device 104 further comprises a display element, not shown, for providing a user with a value of the instantaneous outside temperature T and / or an instantaneous brightness value.

[0090] The control device 104 further comprises an input element, not shown, to allow a user to configure desired parameters, for example thresholds or control modes.

[0091] The installation 100, in particular the control device 104 and the electromechanical actuator 5 comprise all the hardware and / or software means for implementing the management method which is the subject of the invention.

[0092] The management unit 102 comprises a processing unit arranged to contain and execute a computer program product comprising portions of program code for executing the steps of a method for managing the home automation installation 100 according to the invention.

[0093] In particular, the management unit 102 is capable of determining automatic management of a positioning of the solar protection 3 as a function of a control order provided by the local control unit 12 and / or central control unit 13 and / or the control device 104. The automatic management of the solar protection 3 comprises in particular deployment command orders, i.e. opening, or retraction, i.e. closing of the solar protection.

[0094] The management unit 102 comprises a memory in which control parameters of the electromechanical actuator 5 and a set of programs associated with different control modes can be stored.

[0095] The management unit 102 is also arranged to receive data from the control device 104, in particular data on the outside temperature T or data depending on the outside temperature T. In this regard, the management unit 102 comprises a communication module, arranged to communicate with the communication unit 224 of the control device 104. In particular, the management unit is arranged to implement different modes of control of the electromechanical actuator 5 as a function of the temperature data collected by the control device 104.

[0096] The management unit 102 also comprises a user interface. The user interface is arranged to allow possible programming of the management unit 102.

[0097] The management unit 102 can be integrated into the electromechanical actuator 5 or remote from it.

[0098] The management method according to the invention is described below in relation to figures 6, 7 and 8.

[0099] The method aims to detect a probability that an overheating situation Sc occurs in the building from information on the outside temperature T of the building and to act accordingly.

[0100] According to one embodiment, the comfort temperature range is within the interval [16°, 30°], for example the interval [19°, 27°], preferably the interval [21°, 26°].

[0101] More precisely, the management method according to the invention aims to modify the position of the solar protections 3 so as to limit an increase in the interior temperature T;, so that it remains within the comfort temperature range while preserving visual comfort for the users. The method acts on the solar protections 3 when an overheating situation Sc linked to solar radiation a is considered possible or probable, in particular when this probability is greater than a predefined threshold. More precisely, the method puts the solar protections 3 in the deployed position at least partially when a probability of an overheating situation Sc occurring is detected.

[0102] The method acts proactively, preferably before the overheating situation Sc can be detected. In particular, the method determines the external temperature parameters T required by the process over a night period. The The process also ensures that the impact of controlling solar protection on users' visual comfort is minimized.

[0103] The interior temperature T; in a room of a building is influenced by different phenomena, in particular: - external climatic conditions, including the irradiance of external objects and the external temperature T; - air conditioning and heating systems; - activities carried out inside the building.

[0104] The outside temperature T of the building is essentially influenced by the outside climatic conditions, in particular direct or reflected solar radiation. As seen above, this outside temperature T has a strong impact on the inside temperature in the building. In particular, the outside temperature T undergoes diurnal and nocturnal variations, under the influence of the presence or absence of solar radiation.

[0105] Periods of low brightness and high brightness are defined on the basis of the brightness values ​​measured and recorded over time. In particular, low brightness characterizing the periods of low brightness is characterized by values ​​lower than approximately 300 lux and high brightness characterizing the periods of high brightness by values ​​greater than approximately 300 lux or greater than approximately 1000 lux. In the latter case, the brightness values ​​in the interval are said to be indeterminate. Brightness peaks during a period of low brightness or darkening during a period of higher brightness can sometimes cause false period detections and it is advantageous to ensure that these periods are sustainable over time. It is thus sought to ensure that these periods correspond to a day / night alternation and this regardless of the location of the control device on the building.

[0106] For sustained low light readings, for example extending over a duration greater than several hours and following a day state, a night duration counter C0 is incremented. A day duration counter C1 is reset to zero once a night state is confirmed, i.e. once the night duration counter C0 is incremented.

[0107] Similarly, the day length counter C1 is incremented when the brightness readings show sustained high brightness, for example extending over a period of more than several hours and following a night state.

[0108] When the day state is confirmed: - We check if it is the start of the day (i.e. if the night counter is still strictly greater than 0). If this is the case, we check that the previous night was of sufficient duration before updating the temperature extremes with the new temperature values ​​from the previous night. - Otherwise, the temperature extrema are not updated.

[0109] The night duration counter is reset to zero once the day state is confirmed, in other words once the day counter Cl is incremented and the previous checks have been carried out.

[0110] If it is not possible to determine a night state, the previously recorded minimum and maximum temperature data may be retained and are therefore not updated.

[0111] The outside temperature T is strongly influenced by solar radiation. In particular, the readings by the temperature measuring sensor 202 subjected to the influence of direct solar radiation may be biased compared to an outside temperature reading T without direct radiation on the sensor.

[0112] The method is therefore based on readings of the outside temperature T in low light conditions, these guaranteeing the absence of bias linked to direct solar radiation a on the temperature measurement sensor 202.

[0113] More precisely, the temperature information comes solely from a succession of external temperature measurements T spaced apart by a sampling time interval, the latter preferably being between Oh and Ih, for example 15 minutes.

[0114] The method implemented by the control device 104 located at least partly outside the building and by the management unit 102 is illustrated in [Fig.6] and comprises the following steps: - A measurement step El in which values ​​of outside temperature T and brightness are recorded; - An analysis step E2 in which the brightness values ​​recorded make it possible to determine at least one consecutive period of low brightness pn and one period of high brightness pj; - A step E3 for determining the minimum Tmin and maximum Tmax external temperatures over the low light period pn; - A control step E4, during the period of high brightness, intended for the management unit 102, of the position taken by the solar protection 3 as a function of the minimum Tmin and maximum Tmax external temperatures recorded during the period of low brightness pn, in particular, a control during the period of high brightness pj following.

[0115] The control method may also comprise a step E5 of controlling the return of the position of the solar protection to its original position, i.e. the one occupied previously in step E4, in particular when the overheating situation is no longer more proven.

[0116] According to one embodiment, illustrated in [Fig.7], the method determines a reactivity coefficient during the control step.

[0117] This reactivity coefficient Cr can be associated with a probability of occurrence of an overheating situation, this determining at what time the deployed position of the solar protections must be implemented to avoid or limit the probable overheating situation Sc.

[0118] The method implemented can then comprise the preceding sub-steps, in particular implemented following step E3: - A step E3.1 of comparison of the maximum outside temperature Tmax with a first threshold Smax; - A step E3.2 of comparison of the minimum outside temperature Tmin with a second threshold Smin; - A step E3.3 of definition of a reactivity coefficient Cr.

[0119] The control step E4 thus takes into account, through step E3.3, the reactivity coefficient Cr.

[0120] The table in [Fig.7] summarizes the possible conditions determined on the basis of the external temperature information measured in low light conditions, implemented in particular during steps E3.1 and E3.2.

[0121] When the maximum outside temperature Tmax recorded during the low light period pn is lower than the first temperature threshold Smax, the minimum temperature Tmin recorded during the same low light period is analyzed.

[0122] If the minimum temperature Tmin recorded is lower than the second threshold Smin, the probability of overheating in the building is considered lower than an action threshold. A reactivity coefficient Cr is set to a first value. For example, the reactivity coefficient Cr can, in this case, be set to 1 on a scale of 1 to 4. In other words, the method, using the outdoor temperature readings T during the night, makes it possible to define a low reactivity coefficient Cr when both the maximum Tmax and minimum Tmin temperatures recorded are low. Such a situation is considered not very critical in the prediction of overheating situations Sc.

[0123] If the minimum temperature Tmin recorded is higher than the second threshold Smin, the probability of overheating in the building is considered higher than the action threshold. The reactivity coefficient Cr is set to a second value. For example, the reactivity coefficient Cr can, in this case, be set to 2 on a scale of 1 to 4. In other words, the method, using the outdoor temperature readings T during the night, makes it possible to define an average reactivity coefficient Cr when the maximum temperature Tmax is low but the minimum temperature Tmin recorded is high. Such a situation is considered moderately critical in the forecasting of situations of overheating Sc.

[0124] When the maximum outside temperature Tmax recorded during the low light period pn is higher than the first threshold Smax, the minimum temperature Tmin recorded during the same low light period is analyzed.

[0125] If the minimum temperature Tmin recorded is lower than the second threshold Smin, the probability of overheating in the building is considered higher than the action threshold. The reactivity coefficient Cr is set to a third value. For example, the reactivity coefficient Cr can, in this case, be set to 3 on a scale of 1 to 4. In other words, the method, using the outdoor temperature readings T during the night, makes it possible to define an average reactivity coefficient Cr when the maximum temperature Tmax is high but the minimum temperature Tmin recorded is low. Such a situation is considered moderately critical in the prediction of overheating situations Sc.

[0126] If the minimum temperature Tmin recorded is higher than the second threshold Smin, the probability of overheating in the building is considered higher than an action threshold. The reactivity coefficient Cr is set to a fourth value. For example, the reactivity coefficient Cr can, in this case, be set to 4 on a scale of 1 to 4. In other words, the method, using the outdoor temperature readings T during the night, makes it possible to define a high reactivity coefficient Cr when both the maximum Tmax and minimum Tmin temperatures recorded are high. Such a situation is considered highly critical in the prediction of overheating situations Sc.

[0127] Each reactivity coefficient Cr can correspond to a brightness threshold Sb which, when reached, will initiate a command to close the solar protections controlled by the control device 104. Thus, the deadline at which the deployed position of the solar protections must be implemented to avoid or limit the probable overheating situation Sc is determined by a brightness datum. Alternatively, this deadline could be given by a period of time, for example by a period of time from the exceeding of a brightness threshold.

[0128] Thus, a reactivity coefficient Cr at the first value does not correspond to any command, whatever the brightness level. In other words, this reactivity coefficient Cr corresponds to a brightness level tending towards infinity. Alternatively, the reactivity coefficient Cr at the first value can be associated with a very high first brightness threshold SI, for example well above 60,000 lux, so that the controlled movements of deployment of the solar protections 3 take place, not on thermal criteria, but to avoid glare in the room or to protect it from excessively intense radiation.

[0129] A reactivity coefficient Cr at the second or third value corresponds to a second or third brightness threshold S2 or S3 of approximately 25,000 lux, beyond which a deployment movement of the solar protections can be controlled.

[0130] A reactivity coefficient Cr at the fourth value corresponds to a fourth brightness threshold S4 of approximately 3000 lux, beyond which a deployment movement of the solar protections can be controlled.

[0131] According to one embodiment, the solar protection 3 takes a deployed position when the brightness measured from the brightness determination means 220 of the control device 104 is greater than the thresholds associated with the reactivity coefficient Cr calculated during the previous night.

[0132] The calculation of the reactivity coefficient Cr is updated daily, preferably once every 24 hours.

[0133] Conversely, when the brightness value falls below a fold-back threshold, there is no longer any risk of overheating and the solar protection 3 can take a folded position or remain in its position.

[0134] The reactivity coefficient Cr is determined at least as a function of a comparison of the minimum temperatures Tmin and maximum Tmax of the outside temperature at the first and second thresholds Smin Smax, this maximum and minimum being determined over the low light period pn.

[0135] Alternatively or in addition, the control step defines an intermediate position to be taken or in other words controls the intermediate position taken by the solar protection as a function of the reactivity coefficient Cr. In particular, a first movement towards an intermediate position can be emitted when the brightness exceeds a first threshold associated with the reactivity coefficient Cr and a second movement towards a fully closed position can be emitted when the brightness exceeds a second threshold associated with the reactivity coefficient Cr.

[0136] Thus, the method contributes to the prevention of overheating situations Sc in a building, particularly during a summer season and limits the movements of the solar protections to useful situations. The particular interest of this method is to rely mainly on reliable external temperature measurements T.

[0137] According to an alternative embodiment, illustrated in [Fig.8], the method determines a position coefficient during the control step.

[0138] The method implemented can then comprise the preceding sub-steps, in particular implemented following step E3: - A step E3.1' of comparing the ambient brightness with different brightness thresholds L0, Ll, L2; - A step E3.2' of comparing the maximum outside temperature Tmax with a first position threshold Smax or a step of comparing the minimum outside temperature Tmin with a second position threshold Smin; on the example of [Fig.8], the first position threshold and the second position threshold being equal respectively to the first threshold Smax and to the second threshold S min* - A step E3.3' of definition of a position coefficient Cp.

[0139] The control step E4 thus takes into account, through step E3.3', the position coefficient Cp.

[0140] The table in [Fig.8] summarizes the possible conditions determined on the basis of the external temperature information measured in low light conditions, implemented in particular during steps E3.1' and E3.2' and implemented as a function of the brightness measured during the subsequent high light period.

[0141] When the brightness L is lower than a brightness threshold L1 while being higher than the brightness threshold LO characterizing the past period of low brightness, the minimum temperature Tmin recorded during the period of low brightness is analyzed.

[0142] If the minimum temperature Tmin recorded is lower than the second position threshold Smin, the probability of overheating in the building is considered lower than an action threshold. A position coefficient Cp is set to a first value PO. For example, the value of PO is 0%, which implies that the solar protection screen is completely raised, so as to maximize visibility to the outside for the occupants of the building and take into account any solar gains. Indeed, such a situation is considered to be of little critical importance in the prediction of overheating situations Sc.

[0143] If the minimum temperature Tmin recorded is higher than the second position threshold Smin , the probability of overheating in the building is considered higher than that of the previous situation. The position coefficient Cp is set to a second value PL For example, the value of PI is 30%, which implies that the solar protection screen is partially deployed, over approximately 30% of its travel. Indeed, such a situation is considered moderately critical in the prediction of overheating situations Sc. The partial deployment of the solar protection screen can make it possible to block a portion of the solar radiation which could lead to an overheating situation Sc.

[0144] Thus, the minimum night temperature determines the level of closure in average brightness during the day (for example for sunlight on the facade between 5000 lux and 20000 lux).

[0145] When the brightness L is greater than a brightness threshold L2, itself greater than the brightness threshold L1, the maximum temperature Tmax recorded during the period of low brightness is analyzed.

[0146] If the maximum temperature Tmax recorded is lower than the first position threshold S max, the probability of overheating in the building is considered higher than that of the previous situation. The position coefficient Cp is set to a third value P2. For example, the value of P2 is 50%, which implies that the solar protection screen is partially deployed, over approximately 50% of its travel. Indeed, such a situation is considered moderately critical in the prediction of overheating situations Sc. The partial deployment of the solar protection screen can make it possible to block a portion of the solar radiation which could lead to an overheating situation Sc.

[0147] If the maximum temperature Tmax recorded is higher than the first position threshold S max, the probability of overheating in the building is considered higher than that of the previous situation. The position coefficient Cp is set to a fourth value P3. For example, the value of P3 is 80%, which implies that the solar protection screen is partially deployed, over approximately 80% of its travel. Indeed, such a situation is considered highly critical in predicting overheating situations Sc. The almost complete deployment of the solar protection screen then makes it possible to block a significant portion of the solar radiation which could lead to an overheating situation Sc.

[0148] Thus, the maximum night temperature determines the level of closure in very strong light (for example greater than 40,000 lux).

[0149] Thus, a position coefficient Cp at the first value preferably does not correspond to any command. In other words, this position coefficient Cp corresponds to a completely folded solar protection screen.

[0150] When the brightness value L falls below the first threshold L0, there is no longer any risk of overheating and the solar protection 3 can take a completely folded position or remain in its position.

[0151] When the brightness value L is between the brightness thresholds L1 and L2, the sun protection 3 is maintained in its current position. Thus, the brightness thresholds L1 and L2 form a hysteresis. Maintaining the sun protection 3 in its position in this brightness range makes it possible to avoid excessively frequent movements which could inconvenience a user.

[0152] The values ​​corresponding to the different position coefficients and the temperature thresholds can be adjusted according to a thermo-visual index representative of a preference or weighting between visual comfort and thermal comfort, chosen by the user by means of the input element of the control device or by any other appropriate means. The thermo-visual index can for example take a value from among n comfort situations, n being an integer for example equal to 5. For an index 1, respectively n, it is visual comfort, respectively thermal comfort which is favored. compared to thermal comfort, respectively visual comfort. For an index equal to 3, thermal comfort and visual comfort are considered equally. Indices 2 and 4 then correspond to intermediate weightings.

[0153] The implementation of the method can thus maintain a thermal control situation in the building without disturbing the user with untimely movements contradictory in the thermal sense and without requiring a temperature measurement during the period of high brightness pj, i.e. during the control period.

[0154] The use of the method also makes it possible to avoid significant parameterization to define the structure of the building, such as thermal insulation coefficients, geolocation, etc.

[0155] Thus, the method is reliable while being implemented from a local control unit 12, not necessarily connected to an external communication network, autonomous and easily installed outside a building.

[0156] Thus, the management method can be implemented without any particular action from the user of the building, the control device 104 being energy autonomous and adapted to operate in particular during the hot periods of the year without creating counterproductive movements in the cool season, where the user would rather favor solar inputs.

[0157] Of course, the invention is not limited to the embodiments described and shown in the attached figures. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

Claims

1. Method for managing a home automation installation (100) of a building (1) comprising at least one motorized solar protection (3), a management unit (102) of a position taken by the solar protection (3) over time, and at least one control device (104) comprising at least one sensor for measuring an external temperature (202) of the building (1) and a means for determining brightness (220), the method being implemented by the control device (104) located at least partly outside the building and comprising: - A measurement step (El) in which values of external temperature (T) and brightness (L) are recorded; - An analysis step (E2) in which the brightness values recorded make it possible to determine at least one period of low light (pn), - A step (E3) of determining the minimum (Tmin) and maximum (Tmax) external temperatures over the period of low light (pn);- A step (E4) of controlling, over a period of high brightness, the position taken by the solar protection (3) to the management unit (102) as a function of the minimum (Tmin) and maximum (Tmax) external temperatures recorded over the period of low brightness (pn), said period of high brightness being successive to the period of low brightness.;

2. Management method according to claim 1, in which the control step (E4) is a function of the brightness measured over the period of high brightness (pj).

3. Management method according to any one of the preceding claims, wherein the low light period (pn) is defined for brightness values below 300 lux.

4. Management method according to any one of the preceding claims, in which a succession of values of the outside temperature (T) over the low light period (pn) is recorded by sampling measurements of the outside temperature (T) over the low light period (pn).

5. Management method according to any one of the preceding claims, characterized in that it comprises an update of a first time counter (CO) associated with the low light period (pn) and of a second time counter (Cl) associated with the high light period (pj).

6. Management method according to any one of the preceding claims, comprising a step (E3.3) of determining a reactivity coefficient (Cr).

7. Management method according to the preceding claim, in which the reactivity coefficient (Cr) is determined as a function of a comparison of the maximum outside temperature (Tmax) recorded with a first threshold (Smax) and a comparison of the minimum outside temperature (Tmin) with a second threshold (Smin).

8. Management method according to claims 2 taken in combination with claim 6 or 7, in which the solar protection (3) takes an at least partially deployed position when on the one hand the determined reactivity coefficient (Cr) is associated with a movement command and on the other hand when the measured brightness value exceeds a brightness threshold (Si, SI, S2, S3, S4), said brightness threshold being associated with the determined reactivity coefficient (Cr).

9. Management method according to one of claims 2 to 5, comprising a step (E3.3') of determining a position coefficient (Cp).

10. Management method according to the preceding claim, in which the position coefficient (Cp) is determined as a function of a comparison of the brightness measured over the period of high brightness with at least one brightness threshold (Si, LO, Ll, L2) and as a function of the comparison of the maximum temperature (Tmax) recorded with a first position threshold (Smax) or of a comparison of the minimum temperature (Tmin) with a second position threshold (Smin).

11. Management method according to the preceding claim, in which the position coefficient (Cp) is determined as a function of a thermovisual index representing a weighting between thermal comfort and visual comfort, preselected by a user of the home automation installation (100).

12. Control device (104) for a home automation installation (100) of a building implementing a management method according to any one of the preceding claims, comprising an outside temperature measurement sensor (202) and a means for determining the lu- minosity (220), the control device (104) comprising an electronic control unit (222) comprising a communication unit (224) and a controller (226).

13. Control device (104) according to the preceding claim, comprising a photovoltaic panel (106) and a rechargeable battery (104) powering the control device, the control device being adapted to be fixed on a facade outside the building, the photovoltaic panel (106) being adapted to recharge the battery.

14. Control device (104) according to the preceding claim, in which the brightness determining means (220) is a measurement of the current supplied by the photovoltaic panel (106) to the rechargeable battery (104).

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