Algorithm for compensating an outdoor temperature measurement

Abstract

A method for managing a solar shading device (3), comprising a first (201) and a second (202) outdoor temperature sensor, and a light sensor (220), a control device performing, for each of the two temperature sensors (201, 202): A first measurement step (E1) of temperature (Ta, Tb); A first analysis step (E2) determining a temporal temperature variation; the method comprising the steps: A second measurement step (E3) of light (L); A second analysis step (E4) determining a correction coefficient; A determination step (E5) of at least one bias based on the temperatures, the variations, and the correction coefficient; A determination step (E6) of an ambient temperature based on the outdoor temperatures and the bias; A control step (E7) of the position of the solar shading device (3) as a function of the ambient temperature. Figure 6

Description

Title of the invention: Algorithm for compensating an outdoor temperature measurement

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

[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 solar protections like roller shutters or blinds, or openings allowing natural ventilation to be managed, the behavior of which, in particular through automatic control, has a strong influence on the evolution of thermal comfort, i.e. the interior temperature of the building, and interior visual comfort.

[0003] Several phenomena can influence thermal comfort in the building, including: - External climatic conditions, including direct solar radiation or irradiance from external objects, and external temperature, through their impacts on the building's external envelope, cause the internal temperature to change with varying degrees of inertia. This inertia varies in particular depending on the building materials, the building's insulation, the orientation of openings, and the building's geometry; - Air conditioning and heating systems can also change the indoor 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 the operation of an oven or a chimney, or the presence of a large number of people, etc., also greatly affect the internal temperature of the building.

[0004] Among these phenomena, irradiance and more specifically solar radiation transmitted through a glazing of an opening in the building, as well as the outside ambient temperature, are among the predominant components impacting the inside temperature.

[0005] Thus, controlling solar shading, that is, controlling the opening or closing of the solar shading, by interacting directly with the outside, has a direct and significant impact on thermal and visual comfort, with an expenditure Very limited energy is needed to ensure this control. In other words, good management of solar shading allows the interior temperature of the building to vary by several degrees.

[0006] Controlling or managing a solar protection involves modifying the positions of the solar protection over time between a deployed or unrolled position in which it stops at least part of a 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 perspective because it is difficult for a building occupant to know precisely the ideal position of the sunshades at any given time, and when to open or close them. Furthermore, when the building is unoccupied, these movements are impossible, unlike automatic control which continuously adjusts the positioning of the shades. It is therefore important to be able to manage the automatic control optimally, particularly to limit the increase in indoor temperature, especially during periods of high heat.

[0008] On the other hand, it is also relevant for a user to have feedback on the movements implemented within the framework of this automatic control, in particular by having the ability to know an outside ambient temperature which may be the cause of closures of the sun protections.

[0009] However, determining this outside ambient temperature is particularly complex, especially because it depends heavily on the placement of the temperature sensor in relation to the building, in particular its orientation, its disposition to be subjected to direct or indirect solar radiation, the effects of wind or any natural or forced convection, or even the surface on which it is mounted.

[0010] A known solution, described in US patent document 2013020442, exists for determining the indoor ambient temperature of a building using a thermostat with a third temperature sensor when direct light strikes the thermostat. The third temperature sensor is positioned so as to be less likely to be heated by direct radiation. The ambient temperature value is then calculated based on the temperatures from this third sensor and historical data.

[0011] The aforementioned patent application therefore relates to a thermostat intended for indoor use. In contrast, a control device intended for outdoor use, and in particular a self-contained control device powered by a solar panel, is intended to be exposed to direct sunlight as much as possible. A different management approach than that described in patent application US20130204442 must therefore be applied.

[0012] The temperature that the control device placed outside can detect depends, as mentioned previously, on the placement of the temperature sensor in relation to the building and in particular on the support (or building wall) on which it is mounted.

[0013] For this purpose, it is important to be able to reliably determine the conditions surrounding the control device such as solar radiation and wind.

[0014] The invention aims to remedy all or part of the aforementioned drawbacks by proposing a management method adapted to a control device configured to be placed outside a building.

[0015] The invention relates to a method for managing a home automation system of a building comprising at least one motorized sunshade, a unit for managing the position taken by the sunshade over time, and at least one control device comprising at least one first sensor for measuring an outside temperature of the building, at least one second sensor for measuring an outside temperature of the building, and a means for determining brightness, the method being implemented by the control device located at least partly outside the building, the control device implementing for each of the at least two temperature measurement sensors: - A first measurement step in which outside temperature values ​​from the temperature sensor are recorded and stored; - A first analysis step in which the temperature values ​​from the sensor are derived to determine a temporal variation of temperature...;

[0016] the process also comprising the following steps: - A second measurement stage in which brightness values ​​are recorded, - A second analysis stage in which at least one correction coefficient is determined based on at least the measured brightness values, - A step to determine at least one temperature bias based on temperature values ​​from temperature sensors, temporal temperature variations and at least one correction coefficient; - A step of determining the ambient temperature value based on the temperature values ​​from the temperature sensors and at least one temperature bias; - A control step by the position management unit taken by the sun protection according to the ambient temperature value.

[0017] Monitoring of changes in outside temperature using measurements of The first and second sensors, along with monitoring of the ambient light environment, allow us to determine the impact of this light environment on the control device under real-world exposure conditions. This enables us to correct the temperature measured by the sensors to a value closer to the ambient air temperature, thus providing this value to the control unit. Recording and analyzing outdoor temperature and light levels over different periods with varying light conditions allows us to reliably determine the biases introduced by direct or indirect solar radiation on the control device in its external environment, adapting the bias determination to each specific field situation.In other words, each control device placed in an installation will have an ambient temperature determination adapted to its own mounting situation and not just a bias defined on the basis of theoretical laboratory values.

[0018] In practice, a correction coefficient and therefore a bias are determined for each temperature sensor.

[0019] The temporal variation of temperature corresponds to a derivative of the sensor temperature with respect to time.

[0020] According to one embodiment, the second analysis step takes into account at least one theoretical value to determine at least one correction coefficient.

[0021] A theoretical compensation is applied to the temperature readings of the control device, using the theoretical value employed to determine the correction coefficient, to compensate for thermal inertia experienced by the device relative to theoretical or simulated conditions of solar radiation influence obtained in the laboratory. This theoretical value serves as a basis for calculation.

[0022] Thus, before any adaptation of the correction coefficient(s) specific to the installation environment of the control device, the method is based on a theoretical value, in particular a value defined in the laboratory. This theoretical correction coefficient corresponds to a thermal inertia, based on laboratory measurements in the absence of wind. The correction coefficient corresponds to the number of degrees gained per watt of exposure. The theoretical correction coefficient is determined independently for the first sensor and for the second sensor. Alternatively, a single theoretical correction coefficient value is used for both sensors.

[0023] According to one embodiment, the means for determining brightness provides an irradiance value.

[0024] The means for determining brightness thus enables the control device to distinguish between heating related to ambient air temperature and heating related to radiation.

[0025] According to one embodiment, a first correction coefficient is determined for the first sensor, and a second correction coefficient is determined for the second sensor.

[0026] According to one embodiment, the first correction coefficient, respectively the second correction coefficient, is calculated as a function of a derivative of the temperatures provided by the first sensor, respectively the second sensor, divided by an irradiance value provided by the means for determining brightness.

[0027] The correction coefficient is therefore adapted to the thermal situation encountered by the control device at specific points and to each temperature sensor.

[0028] According to one embodiment, the first correction coefficient, respectively the second correction coefficient, is determined based on a history of the values ​​of the first correction coefficients, respectively the second correction coefficients.

[0029] The correction coefficient is therefore adapted to the thermal situation encountered by the control device over time. The determination of a bias, in particular a bias for each sensor, and thus the transmitted temperature value, is adapted to the different situations to which the control device is subjected. This optimizes the relationship between the temperature measured by the at least two sensors and the ambient temperature value deduced from them, depending on the environment external to the control device.

[0030] Advantageously, the first correction coefficient, respectively the second correction coefficient, is determined as a function of an average of the values ​​of the first, respectively the second, correction coefficients, over a plurality of pre-recorded correction coefficient values.

[0031] Thus, the correction coefficient is not based on a simple instantaneous or daily reading, but on a plurality of readings, for example taken over periods prior to the temperature readings and averaged.

[0032] Advantageously, daily values ​​of the first correction coefficient are stored as data in a first memory table, and once the first memory table is full with first correction coefficients determined, the lowest data in the first memory table is replaced as soon as a new higher daily value is determined, respectively daily values ​​of the second correction coefficient are stored as data in a second memory table, and once the second memory table is full with second correction coefficients determined, the lowest data in the second memory table is replaced as soon as a new higher daily value is determined.

[0033] Thus, the average of the correction coefficients tends towards an asymptote, cor- responding to the actual situation as seen by the control device.

[0034] Alternatively, daily values ​​of the first correction coefficient are stored as data in a first memory table and once the first memory table is full with first correction coefficients determined, any new daily value of the first correction coefficient replaces the oldest data, respectively daily values ​​of the second correction coefficient are stored as data in a second memory table and once the second memory table is full with second correction coefficients determined, any new daily value of the second correction coefficient replaces the oldest data.

[0035] Thus, the average of the values ​​in the memory table corresponds to an updated value. This allows the temperature bias to be readjusted if the control device is moved or if the support surface on which it is mounted changes (for example, in the case of external building insulation).

[0036] According to one embodiment, the second analysis step is carried out for low irradiance values, in particular for irradiance values ​​below 100 W / m2.

[0037] The distinction of low irradiance allows us to define a regime in which the cooling rate is negligible, particularly negligible compared to a correction factor corresponding to the heating rate. Indeed, for low irradiance, for example less than 100 W / m², the temperature difference relative to the air is small for these irradiances: we then consider the cooling rate to be negligible. We are considering a case where the cooling due to the air is low and the irradiance is the source of heating. If the irradiance were already high, it would be impossible to determine whether the cooling is negligible.

[0038] According to one embodiment, the correction coefficient is determined before each temperature measurement in a low irradiance regime.

[0039] Alternatively, the daily value of the correction coefficient is updated whenever required lighting and temperature conditions permit.

[0040] The invention also relates to a control device for a home automation installation in a building implementing a management method according to the invention, the control device comprising a housing extending along a longitudinal axis, a first sensor for measuring outside temperature and a means for determining brightness, the control device comprising an electronic control unit including a communication unit and a controller, the control device further comprising a second temperature sensor, the first and second temperature sensors being arranged in the housing, at two locations in the housing separated by a height distance along the longitudinal axis of the housing.

[0041] The particular interest is to rely mainly on a control device located outside a building, comprising a first and a second temperature measurement sensor and a means for determining brightness and whose housing and the arrangement of the sensors in the housing makes it easier to take into account the surrounding conditions.

[0042] The use of a plurality of temperature values ​​from at least two sensors judiciously placed in a housing of the control device makes it possible to take into account natural convection in the vicinity of it, or other influences such as wind and to refine the value of at least one bias accordingly.

[0043] In particular, the arrangement of the two sensors, one at the bottom and the other towards the top of the housing, makes it possible to take into account a natural convection effect.

[0044] Advantageously, the first and second sensors are in contact with the housing.

[0045] The first and second sensors are sensors adapted to measure the temperature of the surface on which they are positioned, here, the plastic casing. Thus, the temperature measured by the first, respectively the second sensor, corresponds to the temperature of the part of the casing in contact with the first, respectively the second sensor.

[0046] Thus, the analysis of the measurement from the two sensors makes it possible to determine a natural convection effect concerning the air surrounding the housing. The housing itself therefore does not need to have air inlet and outlet openings; it can be designed with good air and water tightness.

[0047] According to one embodiment, the first and second sensors are both positioned in the same plane parallel to a bottom plane of the housing.

[0048] Thus, the thermal influence of the wall on which the control device is mounted affects the first and second sensors in a substantially equivalent way, as does solar radiation when the housing is subjected to direct solar radiation.

[0049] Advantageously, the means for determining brightness is a sensor comprising a visible light detector and an infrared or near-infrared light detector. The means for determining brightness is thus capable of providing the irradiance value. The means for determining brightness therefore makes it possible to distinguish between heating due to ambient air temperature and heating due to radiation.

[0050] According to one embodiment, the device includes a photovoltaic panel and a rechargeable battery powering the control device, the control device being adapted to be fixed on a facade outside the building, the photovoltaic panel being adapted to recharge the battery.

[0051] The control device is thus energy self-sufficient. It can also be completely disconnected from an external data network and therefore operate solely on the basis of the data it measures.

[0052] The invention will be better understood from the following description, which relates to several embodiments according to the present invention, given by way of non-limiting examples and explained with reference to the accompanying schematic drawings, in which:

[0053] [Fig. 1] is a schematic representation of a building comprising a home automation installation implementing a process according to the invention;

[0054] [Fig.2] is a schematic cross-section of a solar protection of the home automation installation of [Fig.1];

[0055] [Fig.3] is a schematic perspective view of the solar protection illustrated in [Fig.2];

[0056] [Fig.4] is a perspective view from below of a control device enabling the implementation of a method according to the invention;

[0057] [Fig.5] is a partially exploded top view of the control device of the [Fig.4];

[0058] [Fig.6] is a partial view of the control device of figures 4 and 5;

[0059] [Fig.7] is an illustration of a method according to the invention.

[0060] The solution proposed here relates to a control device for the position of a sun protection over time, allowing action on the thermal comfort of an area of ​​a building through the automatic control of the sun protection.

[0061] As illustrated in [Fig.1], a building 1 includes a home automation installation 100 comprising a motorized sun protection 3. The home automation installation 100 includes a management unit 102 of a position taken by the sun protection 3 over time.

[0062] The installation also includes at least one control device 104 for a home automation system. Air conditioning and heating devices 106 may also be present in the building area.

[0063] The sun protection 3 is installed on the exterior or interior of the building, in particular near an opening 108 of the building. An opening 108 is, for example, a window, a French window, or a glazed door. The sun protection is advantageously an interior or exterior blind made of fabric or equipped with adjustable slats. However, the present invention applies to all types of sun protection. The building may also be a pergola.

[0064] As shown in Figures 2 and 3, the sunshade 3 comprises a fabric 2 fixed at one end to a winding shaft 4, located inside a housing 9 and driven by an electromechanical actuator 5, and at the other end to a weighted bar 8. The sunshade 3, and more particularly the fabric 2, is movable between a rolled or folded position, in particular high, in which the fabric 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 fabric 2 covers the opening and thus at least partially blocks solar radiation through the opening 108. The deployment of the fabric 2 can be guided by tracks 6.

[0065] 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 fabric 2.

[0066] In the case of a slatted sunshade, the individual slats of the shade are preferably suspended via cords or ribbons intended to be wound onto or unwound from the winding shaft so as to fold or unfold the screen.

[0067] In the case of a patio awning-type sunshade, extending substantially horizontally relative to a vertical facade, the fabric is deployed by spring-loaded arms that move the bar 8, referred to in this case as the load bar. The electromechanical actuator acts as a brake in this case. The fabric is retracted by rolling it up onto a roller tube, under the impulse of the electromechanical actuator.

[0068] Alternatively, the sun protection is of the roller shutter type, comprising a set of slats suspended from one another, the curtain thus formed being able to roll up on a winding tube.

[0069] The electromechanical actuator 5 is controlled by a local control unit 12 which may be equipped with an antenna 12a for wireless communication. The local control unit 12 takes the form, for example, of a wall switch or a remote control.

[0070] The installation 100 may also include a central control unit 13, which may be equipped with an antenna 13a, acting as a gateway between the installation 100 and an external Internet network. The control device 104 may be a local control unit 12 or a central control unit 13, or a combination of a local control unit 12 and a central control unit 13.

[0071] The electromechanical actuator 5 is configured to execute movement commands, including deployment or retraction, of the sunshades 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.

[0072] The electromechanical actuator 5 includes an electric motor 10 and an electronic control unit 15 capable of starting the electric motor 10 of the electromechanical actuator 5, and, in particular, enabling the supply of electrical energy to the electric motor 10.

[0073] The electromechanical actuator 5 may include a connection to a mains power source or may include a self-contained electrical power supply device, such as a photovoltaic panel and / or an electrical energy storage device such as a rechargeable battery 4.

[0074] The electronic control unit 15 includes a communication module, in particular for receiving control orders, the control orders being issued by the local control unit 12 or the central control unit 13, for example by means of radio control orders.

[0075] The local control unit and / or the central control unit 13 may be provided with a control keypad, which includes means for selection and possibly display, and which also allows a user to interact with the electromechanical actuator 5 and / or the local control unit 12 and / or central control unit 13.

[0076] The control device 104 of the home automation system allows operation of a sunshade installed outside or inside a room of the building 1, i.e. outside or inside a room of the building 1 comprising at least one opening 108 which may be masked or not or partially masked by the sunshade 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 control units 12 and / or central control units 13. In particular, the control device 104 includes an outdoor device 200.

[0077] As shown in Figures 4 and 5, the external device 200 comprises a housing 208 including a base 209 and a translucent cover 210 attached to the base. The base 209 is provided with fastening means 212, allowing it to be fixed to a wall of the building 1, in particular on the exterior of the building 1. The base 209 also incorporates connection pins 214.

[0078] The control device 104, and more particularly the external device 200, comprises at least a first temperature measuring sensor 201, a second temperature sensor 202, and a brightness determination means 220, and at least one electronic control unit 222, in the form of a printed circuit board 301, 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 includes a time counter 228, a memory 230 in which outdoor temperature data T can be stored at substantially regular intervals over a predefined period, for example, 24 hours, as well as a program for mathematically analyzing this outdoor temperature data T.In particular, the 104 control device does not require a precise clock, but a simple timer is sufficient to define the regularity of temperature or brightness measurements.

[0079] The connection pins 214 are connected to the electronic control unit and allow it to be configured from the base 209 of the external housing 200.

[0080] The control device 104 also includes a rechargeable battery 204 for powering the device and a photovoltaic panel 206 connected to the rechargeable battery 104 and adapted to recharge it.

[0081] 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.

[0082] The brightness determination means 220 makes it possible to determine a degree of ambient brightness in the external environment of the building, and more particularly it is designed to determine an irradiance, that is to say a power of solar radiation per unit area.

[0083] The means for determining brightness 220 may be a physical sensor, including for example a photodiode, a lux meter, or be composed of one or more cells of the photovoltaic panel.

[0084] The means for determining brightness 220 can be a so-called virtual sensor whose captured information is provided by an external weather station.

[0085] In particular, the brightness determination means 220 comprises a sensor including a first visible light detector and a second infrared or near-infrared light detector. These two detection channels provide two values, which, when combined, provide an irradiance value. The two detectors can be separate or combined into a single sensor, comprising, for example, two detection channels.

[0086] The first 201 and the second 202 temperature sensors are placed on either side of the housing 208 with respect to an axis perpendicular to a central longitudinal axis of the housing. In principle, the sensors are thus positioned near the upper and lower edges of the housing, the upper and lower edges being traversed by the central longitudinal axis.

[0087] Advantageously, the first and second temperature sensors are placed on either side of the housing with respect to the longitudinal axis of the housing. In principle, the sensors are thus positioned near a right edge and a left edge of the housing 208, the right and left edges being crossed by the axis perpendicular to the longitudinal axis of the housing.

[0088] Thus, as shown in [Fig.5], the first sensor is located in the dial at the top right of the case and the second temperature sensor is located at the bottom left of the case (the left / right positions can of course be reversed).

[0089] An overall external influence exerted by an external environment on the control device depends on the application of this influence differently to one or the other of the two sensors. In particular, natural convection introduces a temperature gradient between the bottom and top of the housing. The temperature gradient is thus determined from the difference in temperature measurements between the two sensors.

[0090] This temperature gradient can be, for example, 2 to 3°C for a housing height of around 10 cm. Forced convection, induced for example by wind, can also be observed. In particular, forced convection tends to reduce the temperature difference between the first and second sensors.

[0091] Advantageously, the first and second temperature sensors are mounted on a support positioned perpendicular to the plane of the printed circuit board 301 of the electronic control unit 222.

[0092] Also, the first sensor 201 and the second sensor 202 are both at an equal distance from the bottom of the housing.

[0093] The first temperature sensor 201 is placed on a first portion of a printed circuit board 311 connected by a flexible ribbon cable to the main printed circuit board 301. The first portion of the printed circuit board 311 is preferably mounted in the housing orthogonally to the main printed circuit board 301 and placing the first sensor 201 close to, or even resting against, a side wall 302 of the housing.

[0094] Similarly, the second temperature sensor 202 is placed on a second portion of printed circuit board 312 connected by a flexible ribbon cable to the main printed circuit board 301. The second portion of printed circuit board 312 is preferably mounted in the housing orthogonally to the main printed circuit board 301 and placing the second sensor 202 close to, or even resting on, a side wall 302 of the housing, opposite to the one in contact with the first sensor 201.

[0095] The outdoor device 200 is intended to be mounted on a facade so that its longitudinal axis is parallel to a vertical axis with respect to the ground. Thus, in the example shown in Figures 5 and 6, the first sensor 201 is located at the bottom left of the device and the second sensor 202 is located at the top right of the outdoor device 200 mounted on a facade.

[0096] This provision allows: - Maintain temperature sensors 201 and 202 independently of the heating of other electronic components on the printed circuit board, - Ensure the detection of natural and / or forced (wind) convection around the housing by the first 201 and the second 202 sensors, - Ensure symmetrical mounting of the two sensors 201, 202: this way, they are both influenced in a predefined and repeatable way by external conditions, - Ensure the equal thermal influence of the plastics on both sensors 201, 202,

[0097] In the absence of wind, the first sensor 201, located on the bottom of the housing, will measure a higher temperature than that measured by the second sensor 202, located towards the top of the housing. The difference observed can be as much as 2 to 3 degrees Celsius.

[0098] In windy conditions, the difference between the temperature data provided by the first and second sensors 201, 202 will decrease due to air movement around the housing and temperature equalization of the control device housing. Detecting this temperature difference and its reduction also allows for the automatic determination of a temperature bias, in particular a temperature bias per sensor.

[0099] In practical terms, from 4m / s wind speed, the difference between the data provided by the two temperature sensors 201, 202 is negligible and the influence of the wind is constant on the temperature bias.

[0100] Preferably, the two sensors 201, 202 are each mounted in contact with the housing, in particular in contact with the side walls 302 of the housing. The sensors are adapted to measure the temperature of the wall 302 of the housing with which they are in contact. Thus, the measurement provided by each of the sensors 201, 202 corresponds to the temperature of a physical element and not to an ambient air temperature.

[0101] This property of the sensors 201, 202 makes it possible to determine with precision the effects of natural and / or forced convection outside the housing, this natural and / or forced convection having an influence on the temperature of the housing before having a possible influence on the air inside the housing.

[0102] The outdoor device 200 is advantageously located outside the building and functions as a weather station, insofar as it includes, in particular, the outdoor temperature sensors 201, 202 and the light-determining means 220. The outdoor device 200 can also be adapted to measure other parameters, for example, 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.

[0103] The control device 104 further includes a display element, not shown, to provide a user with an instantaneous ambient outside temperature value T and / or an instantaneous brightness value.

[0104] The control device 104 further includes an input element, not shown, to allow a user to configure desired parameters, for example thresholds or control modes.

[0105] The installation 100, in particular the control device 104 and the electromechanical actuator 5, include all the hardware and / or software means for implementing the management process that is the subject of the invention.

[0106] The management unit 102 includes a processing unit arranged to contain and execute a computer program product comprising program code portions for executing the steps of a home automation installation management process 100 according to the invention.

[0107] In particular, the management unit 102 is capable of determining an automatic management of a positioning of the sun protection 3 according to a command 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 sun protection 3 includes in particular command orders for deployment, i.e. opening, or for retraction, i.e. closing of the sun protection.

[0108] The control unit 102 includes a memory in which control parameters for the electromechanical actuator 5 and a set of programs associated with different control modes can be stored.

[0109] The management unit 102 includes 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 control modes of the electromechanical actuator 5 according to temperature data or commands provided by the control device 104.

[0110] The control unit 102 also includes a user interface. The user interface is arranged to allow for possible programming of the control unit 102 and / or the control device 104.

[0111] The control unit 102 can be integrated into the electromechanical actuator 5 or remote from it.

[0112] The management method according to the invention is described below in relation to [Fig.7].

[0113] The method aims to manage a home automation installation from a control device located outside a building and subject to the influence of external environmental parameters.

[0114] The ambient outdoor temperature T of the building is essentially influenced by external climatic conditions, in particular direct or reflected solar radiation. This outdoor temperature T has a strong impact on the indoor temperature of the building. In particular, the outdoor temperature T undergoes diurnal and nighttime variations, influenced by the presence or absence of solar radiation. Specifically, readings from temperature sensors 201, 202 subjected to the influence of direct solar radiation may be biased compared to an outdoor temperature reading T without direct radiation on the control device. Furthermore, the readings from the temperature sensors 201, 202 are also dependent on the wall of the building 1 on which the device is mounted. Order 104.

[0115] The outside temperature T is also dependent on the presence of air currents or wind.

[0116] The outside temperature T is strongly influenced by solar radiation.

[0117] The process is therefore based on temperature readings and light readings, to determine an ambient temperature value corrected with respect to the environment in which the control device is placed.

[0118] More specifically, the ambient temperature information is adapted from temperature values ​​obtained from the two sensors 201, 202 and from at least one temperature bias based on the temperature values ​​from the two sensors 201, 202, the temporal variation of temperature, and at least one correction coefficient. In particular, this correction coefficient corresponds to a heating rate to which a sensor is subjected under the influence of solar radiation. In other words, this correction coefficient corresponds to a gain in degrees per unit power of exposure to solar radiation. In practice, a correction coefficient and a temperature bias are determined for each sensor.

[0119] The process implemented by the control device 104, located at least partly outside the building, is illustrated in [Fig.7] and comprises the following steps: - A first measurement step El in which values ​​of outside temperature Ta, Tb from the first, respectively from the second temperature sensor 201, 202 are recorded; - A first analysis step E2 in which the temperature values ​​Ta, Tb from the first, respectively from the second temperature sensor 201, 202 are each derived with respect to time, to determine a temporal variation of temperature for each sensor 201, 202.

[0120] The first measurement step and the first analysis step preferably concern each of the temperature sensors 201, 202 individually. Alternatively, these steps concern only one of the temperature sensors.

[0121] The process also includes the following steps: - A second measurement step E3 in which brightness values ​​L are recorded; - A second E4 analysis step in which the brightness values ​​L are used to determine at least one correction coefficient; - A determination step E5 of at least one temperature bias based on the temperature values ​​Ta, Tb from the two sensors, the temporal temperature variations and at least one correction coefficient; - A step E6 for determining the ambient temperature value based on the temperature values ​​Ta, Tb from the two sensors 201, 202 and at least one temperature bias; - A control step E7 by the management unit 102 of the position taken by the sun protection 3 according to the ambient temperature value.

[0122] In the implementation of the process, it should be noted that the correction coefficient and therefore the temperature bias can be individually calculated or determined for each of the two temperature sensors 201, 202 or in other words for each of the parts of the housing in relation to one of the two temperature sensors.

[0123] The correction coefficient corresponds to a heating rate, that is to say a number of degrees gained per unit of exposure power, that is to say per Watt of exposure.

[0124] The brightness determination means 220 is adapted to provide an irradiance value. In particular, the brightness determination means 220 makes it possible to distinguish between heating of the outer casing 200 due to an increase in ambient temperature and heating due to solar radiation on the device casing. The correction factor is thus initially determined based on a theoretical correction factor, for example, a value derived from a database of temperature and / or brightness input values ​​provided by the sensors. This database is based, in particular, on laboratory measurements in the absence of wind.

[0125] Alternatively, or in addition, the correction coefficient can be determined from the analysis of the temperature readings from the first measurement step EL

[0126] The correction coefficient can be determined on a recurring basis, in particular daily, and its value is then updated over time. However, to take into account a larger range of situations, the correction coefficient can be defined from several previously determined and stored correction coefficient values, i.e., stored in memory accessible by the control device 104. In this case, the correction coefficient retained at the end of the second analysis step E4 is an average of the last correction coefficients recorded or of a plurality of the most relevant correction coefficients.

[0127] These correction coefficients take into account temperature values ​​under specific conditions, particularly in the absence of direct solar radiation. This absence of direct solar radiation is determined, for example, for irradiance values ​​below 100 W / m². For these values, any observed heating of the casing is quite low, but the values ​​involved also allow us to determine that cooling due to the air around the casing is also quite low and is therefore considered negligible.

[0128] To adapt the correction coefficient value to the support material of the control device 104, a point correction coefficient is determined before each temperature measurement and for an irradiance regime between 0 and 100 W / m², based on the derivative of the temperature divided by the irradiance. The daily maximum is then stored.

[0129] At each temperature measurement, for example every 30 seconds, the derivative of the temperature per sensor is calculated.

[0130] A cooling rate per sensor is then defined by this derivative from which the specific correction coefficient of the corresponding sensor is subtracted.

[0131] A convection factor N is then calculated, representative of the natural and forced convection of air around the housing of the control device 104.

[0132] This convection factor N is defined by the following formula (the indices a corresponding to the first sensor 201 and the indices b to the second sensor 202):

[0133] [Math.l] N ~ (Ta-Tb)

[0134] With:

[0135] N: convection factor

[0136] Ta, Tb: outside temperature measured by the first sensor 201 and the second sensor 202

[0137] t: time

[0138] Correction coefficient a, Correction coefficient b: Correction coefficient of the first sensor 201 and of the second sensor 202

[0139] The temperature bias Tbiais is then derived from the following formula:

[0140] [Math.2] ™. . (cooling rate) i niais —

[0141] With:

[0142] Tbiais: temperature bias

[0143] Cooling rate: cooling rate of the first sensor or the second sensor

[0144] N: convection factor

[0145] The ambient temperature which is then provided by the control device 104 is the sum of the observed temperature and the temperature bias, this bias being negative.

[0146] In practice, the ambient temperature is chosen from one of the following adjusted temperature data: the temperature observed by the first sensor adjusted by the bias associated with the first sensor and the temperature observed by the second sensor adjusted by the bias associated with the second sensor. The ambient temperature is advantageously chosen to be equal to the lower of these two values. In the vast majority of cases, due to bias determinations according to the process, the two adjusted temperature values ​​will be quite close to each other, but due to the phenomenon of natural convection, the lower adjusted temperature will be that provided by the first sensor located at the bottom of the housing.

[0147] The implementation of the process can thus make it possible to adapt the behavior of the solar protection on the basis of a supplied ambient temperature which is precise and which adapts to each environment.

[0148] The management process can be implemented without any specific action from the building user, as the control device 104 is energy self-sufficient and self-adapts to its support within a few days. The correction coefficient value can be reset to a theoretical value if, for example, the control device is moved and used in a different environment.

[0149] Of course, the invention is not limited to the embodiments described and shown in the accompanying figures. Modifications remain possible, particularly with regard to the composition of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

1. Demands Method for managing a home automation system (100) of a building (1) comprising at least one motorized sunshade (3), a management unit (102) for the position taken by the sunshade (3) over time, and at least one control device (104) comprising at least one first sensor (201) for measuring an outside temperature of the building (1), at least one second sensor (202) for measuring an outside temperature 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, the control device implementing for each of the at least two temperature measurement sensors (201, 202): - A first measurement step (El) in which outside temperature values ​​(Ta, Tb) from the temperature sensor (201, 202) are recorded and stored; - A first analysis step (E2) in which the temperature values ​​from the temperature sensor are derived to determine a temporal temperature variation; the process also includes the following steps: - A second measurement step (E3) in which brightness values ​​(L) are recorded; - A second analysis step (E4) in which at least one correction coefficient is determined based on at least the measured brightness values; - A determination step (E5) of at least one temperature bias based on the temperature values ​​from the temperature sensors (201, 202), the temporal variations in temperature and at least one correction coefficient; - A step of determining (E6) the ambient temperature value based on the temperature values ​​from the temperature sensors and at least one temperature bias; - A control step (E7) by the position management unit taken by the sun protection (3) as a function of the ambient temperature value.

2. Management method according to claim 1, wherein the second analysis step (E4) takes into account at least one theoretical value to determine at least one correction coefficient.

3. A management method according to any one of the preceding claims, wherein a first correction coefficient is determined for the first sensor, and a second correction coefficient is determined for the second sensor.

4. Management method according to the preceding claim, wherein the first correction coefficient, respectively the second correction coefficient, is calculated as a function of a derivative of the temperatures provided by the first sensor (201), respectively the second sensor (202), divided by an irradiance value provided by the brightness determination means (220).

5. Management method according to claim 3 or 4, wherein the first correction coefficient, respectively the second correction coefficient, is determined based on a history of the values ​​of the first correction coefficients, respectively the second correction coefficients.

6. Management method according to any one of claims 3 to 5, wherein the first correction coefficient, respectively the second correction coefficient, is determined as a function of an average of the values ​​of the first, respectively the second, correction coefficients, over a plurality of pre-recorded correction coefficient values.

7. A management method according to any one of claims 3 to 6, wherein daily values ​​of the first correction coefficient are stored as data in a first memory table, and once the first memory table is full with first correction coefficients determined, the lowest data in the first memory table is replaced as soon as a new higher daily value is determined, respectively daily values ​​of the second correction coefficient are stored as data in a second memory table, and once the second memory table is full with second correction coefficients determined, the lowest data in the second memory table is replaced as soon as a new higher daily value is determined.

8. A management method according to claim 7, wherein values Daily values ​​of the first correction coefficient are stored as data in a first memory table and once the first memory table is full with first correction coefficients determined, any new daily value of the first correction coefficient replaces the oldest data, respectively daily values ​​of the second correction coefficient are stored as data in a second memory table and once the second memory table is full with second correction coefficients determined, any new daily value of the second correction coefficient replaces the oldest data.

9. A management method according to any one of the preceding claims, wherein the second analysis step (E4) is carried out for low irradiance values, in particular for irradiance values ​​below 100 W / m2.

10. A management method according to the preceding claim, wherein the correction coefficient is determined before each temperature measurement in a low irradiance regime.

11. Control device (104) of a home automation installation (100) of a building implementing a management method according to any one of the preceding claims, the control device (104) comprising a housing extending along a longitudinal axis, a first sensor (201) for measuring outside temperature and a means for determining brightness (220), the control device (104) comprising an electronic control unit (222) comprising a communication unit (224) and a controller (226), the control device (104) further comprising a second temperature sensor (202), the first and second temperature sensors (201, 202) being disposed in the housing, at two locations in the housing separated by a height distance along the longitudinal axis of the housing.

12. Control device (104) according to the preceding claim, wherein the first and second sensors (201, 202) are in contact with the housing.

13. Control device (104) according to any one of claims 11 or 12, wherein the first and second sensors are both positioned in the same plane parallel to a bottom plane of the housing.

14. Control device (104) according to any one of claims 11 to 13, in which the means for determining brightness is a sensor comprising a visible light detector and an infrared or near-infrared light detector.

15. Control device (104) according to any one of claims 11 to 14, comprising a photovoltaic panel (106) and a rechargeable battery (204) powering the control device (104), the control device (104) being adapted to be fixed on a facade outside the building, the photovoltaic panel (206) being adapted to recharge the battery.

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