Algorithm for compensating for an outside temperature measurement

Abstract

The invention relates to a method for managing a sun shield (3), the method comprising a first outside temperature sensor (201) and a second outside temperature sensor (202), and a brightness sensor (220), wherein a control device executes, for each of the two temperature sensors (201, 202): a first step (E1) of measuring the temperature (Ta, Tb); a first analysis step (E2) to determine a variation in the temperature over time; the method comprising the steps of: a second step (E3) of measuring the brightness (L); a second analysis step (E4) to determine a correction coefficient; a step (E5) of determining at least one bias on the basis of the temperatures, the variations and the correction coefficient; a step (E6) of determining an ambient temperature on the basis of the outside temperatures and the bias; a step (E7) of controlling the position of the sun shield (3) depending on the ambient temperature.

Description

[0001] DESCRIPTION

[0002] TITLE: Algorithm for compensating an outdoor temperature measurement

[0003] 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 for a home automation installation.

[0004] 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 protection such as 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.

[0005] Several phenomena can influence thermal comfort in the building, including: 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, changes the internal temperature with a 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 internal 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 fireplace, or the presence of a large number of people, etc.also significantly change the interior temperature of the building.

[0006] Among these phenomena, irradiance and more precisely solar radiation transmitted through the glazing of a building opening, as well as the ambient outside temperature are among the predominant components impacting the interior temperature.

[0007] Thus, controlling solar protection, i.e. controlling the opening or closing of the solar protection, by interacting directly with the exterior has a direct and significant impact on thermal and visual comfort, with very limited energy expenditure to ensure this control. In other words, good management of solar protection makes it possible to vary the interior temperature of the building by several degrees.

[0008] Control or management of solar protection is a modification of the positions of the solar protection over time between an extended or unrolled position in which it stops at least part of the solar radiation, and a folded or rolled position in which it stops a less significant part of the solar radiation. 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 their solar protections. 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 the automatic piloting optimally, in particular to limit the increase in interior temperature, especially during hot seasons.

[0009] On the other hand, it is also relevant for a user to have feedback on the movements implemented within the framework of this automatic piloting, in particular by having the ability to know an external ambient temperature which may be the cause of closing the solar protections.

[0010] However, determining this external ambient temperature is particularly complex, notably 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 solar radiation or not, the effects of the wind or any mature or forced convection, or even the surface on which it is mounted.

[0011] There is a known solution described in patent document US2013020442 for determining the indoor ambient temperature of a building by means of a thermostat using a third temperature sensor when direct light falls on said thermostat, said third temperature sensor being positioned so as to be less likely to be heated due to direct radiation. The ambient temperature value is then calculated based on the temperatures from this third sensor and historical data.

[0012] The aforementioned patent application therefore relates to a thermostat intended for indoor use. On the contrary, a control device intended for outdoor use, and in particular a stand-alone control device powered by a solar panel, is intended to be subjected to direct solar radiation as much as possible. A different management from that described in patent application US20130204442 must therefore be applied.

[0013] 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.

[0014] For this purpose, it is important to be able to reliably determine the environmental conditions at the control device, such as solar radiation and wind.

[0015] The invention aims to overcome all or part of the aforementioned drawbacks, by proposing a management method adapted to a control device configured to be placed outside a building. 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 first sensor for measuring a temperature outside the building, at least one second 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, the control device implementing for each of the at least two temperature measurement sensors:

[0016] A first measurement step in which outside temperature values ​​from the temperature sensor are recorded and stored;

[0017] A first analysis step in which the temperature values ​​from the sensor are derived to determine a temporal temperature variation; the method also comprising the following steps:

[0018] A second measurement step in which brightness values ​​are recorded, A second analysis step in which at least one correction coefficient is determined based on at least the brightness values ​​recorded,

[0019] A step of determining at least one temperature bias based on the temperature values ​​from the temperature sensors, the temporal temperature variations and at least one correction coefficient;

[0020] A step of determining the ambient temperature value based on the temperature values ​​from the temperature sensors and at least one temperature bias;

[0021] A step of control by the management unit of the position taken by the solar protection according to the ambient temperature value.

[0022] Monitoring of changes in the outside temperature using measurements from the first and second sensors, as well as monitoring of the ambient light environment, makes it possible to determine the impact of this light environment on the control device under real exposure conditions. They thus make it possible to correct the temperature measured by the sensors to bring it back to a temperature value closer to the ambient air temperature value and thus provide this to the management unit. Recording and analyzing the outside temperature and brightness values ​​over different periods characterized by different brightnesses therefore makes it possible to reliably determine the biases introduced by direct or indirect solar radiation on the control device in its outside environment, by adapting the determination of the biases to each field situation.In other words, each control device placed in an installation will have an ambient temperature determination adapted to its own installation situation and not just a bias defined on the basis of theoretical laboratory values. In practice, a correction coefficient and therefore a bias are determined for each temperature sensor.

[0023] The temporal variation of temperature corresponds to a derivative of the sensor temperature with respect to time.

[0024] According to one embodiment, the second analysis step takes into account at least one theoretical value to determine the at least one correction coefficient.

[0025] A theoretical compensation is applied to the temperature readings of the control device, through the theoretical value used to determine the correction coefficient, to compensate for thermal inertia experienced by the device compared to theoretical conditions or simulations of the influence of solar radiation carried out in the laboratory. This theoretical value is a calculation basis.

[0026] Thus, before any adaptation of the correction coefficient(s) specific to the installation environment of the control device, the process 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 taken for both sensors.

[0027] According to one embodiment, the brightness determining means provides an irradiance value.

[0028] The brightness determination means thus allows the control device to distinguish between heating linked to the ambient air temperature and heating linked to radiation.

[0029] 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.

[0030] 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 brightness determination means.

[0031] The correction coefficient is therefore adapted to the thermal situation encountered by the control device punctually and to each temperature sensor.

[0032] 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.

[0033] 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 therefore the transmitted temperature value is therefore 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 therefrom, depending on the environment external to the control device.

[0034] 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.

[0035] 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.

[0036] Advantageously, daily values ​​of the first correction coefficient are stored as data in a first memory table, and once the first memory table is complete 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 complete 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.

[0037] Thus, the average of the correction coefficients tends towards an asymptote, corresponding to the real situation seen by the control device.

[0038] Alternatively, daily values ​​of the first correction coefficient are stored as data in a first memory table and once the first memory table is complete 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 complete with second correction coefficients determined, any new daily value of the second correction coefficient replaces the oldest data.

[0039] 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 ever moved or if the support surface on which it is mounted changes (for example in the case of external insulation of the building).

[0040] According to one embodiment, the second analysis step is carried out for low irradiance values, in particular for irradiance values ​​less than 100 W / m 2 .

[0041] The distinction of low irradiance makes it possible to define a regime in which a cooling rate is negligible, in particular negligible compared to a correction coefficient corresponding to a heating rate. Indeed, for low irradiance, for example less than 100 W / m 2, the temperature difference compared to the air is low for these irradiances: we then consider that we have a negligible cooling rate. We are in a case where the cooling due to the air is low and we have irradiance which is the cause of heating. If the irradiance was already high, we cannot know if the cooling is negligible.

[0042] According to one embodiment, the correction coefficient is determined before each temperature measurement in a low irradiance regime.

[0043] Alternatively, the daily value of the correction coefficient is updated whenever required lighting and temperature conditions allow.

[0044] The invention also relates to a device for controlling a home automation installation of 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 the outside temperature and a means for determining brightness, the control device comprising an electronic control unit comprising 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.

[0045] The particular interest is to rely mainly on a control device arranged outside a building, comprising a first and a second temperature measuring sensor and a means for determining brightness and whose housing and the arrangement of the sensors in the housing make it easier to take into account the surrounding conditions.

[0046] 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 thereof, or other influences such as wind and to refine the value of the at least one bias accordingly.

[0047] 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.

[0048] Advantageously, the first and second sensors are in contact with the housing.

[0049] The first and second sensors are sensors adapted to measure the temperature of the surface on which they are positioned, in this case, the plastics of the housing. Thus, the temperature measured by the first, respectively the second sensor corresponds to the temperature of the part of the housing in contact with the first, respectively the second sensor.

[0050] Thus, the analysis of the measurement of the two sensors makes it possible to determine a natural convection effect concerning the air surrounding the housing. The housing itself thus does not need to have air inlet and outlet openings, it can be designed with good air and water tightness. According to one embodiment, the first and second sensors are both positioned in the same plane parallel to a housing bottom plane.

[0051] Thus, the thermal influence of the wall on which the control device is mounted affects the first and second sensors in a substantially equivalent manner, as does solar radiation when the housing is subjected to direct solar radiation.

[0052] Advantageously, the brightness determination means is a sensor comprising a visible light detector and an infrared or near-infrared light detector. The brightness determination means is thus capable of providing the irradiance value. The brightness determination means thus makes it possible to distinguish between heating linked to the ambient air temperature and heating linked to radiation.

[0053] According to one embodiment, the device comprises 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.

[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] 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:

[0056] [FIG. 1] is a schematic representation of a building comprising a home automation installation implementing a method in accordance with the invention;

[0057] [FIG. 2] is a schematic cross-section of a solar protection of the home automation installation of Figure 1;

[0058] [FIG. 3] is a schematic perspective view of the sun protection illustrated in Figure 2;

[0059] [FIG. 4] is a perspective view from below of a control device for implementing a method according to the invention;

[0060] [FIG. 5] is a partially exploded top view of the control device of Figure 4;

[0061] [FIG. 6] is a partial view of the control device of Figures 4 and 5;

[0062] [FIG. 7] is an illustration of a method according to the invention.

[0063] The solution proposed here relates to a device for controlling a position of a solar protection over time, making it possible to act on the thermal comfort of an area of ​​a building by means of automatic control of the solar protection. As illustrated in FIG. 1, a building 1 comprises a home automation installation 100 comprising a motorized solar protection 3. The home automation installation 100 comprises a management unit 102 for a position taken by the solar protection 3 over time.

[0064] 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 building area.

[0065] The sun 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 sun protection is advantageously an interior or exterior blind made of fabric or provided with adjustable slats. The present invention, however, applies to all types of sun protection. The building can also be a pergola.

[0066] 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.

[0067] 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.

[0068] In the case of a slatted blind type sun protection, the individual slats of the blind are preferably suspended via cords or ribbons intended to be wound onto the winding shaft or unwound from the winding shaft so as to fold or unfold the screen.

[0069] In the case of a sun protection of the terrace awning type, deployed substantially horizontally relative to a vertical facade, the deployment of the canvas is carried out under the impulse of spring arms causing the movement of the bar 8, called in this case rather load bar. The electromechanical actuator acts in this case as a brake. The folding of the canvas is done by rolling it onto a winding tube, under the impulse of the electromechanical actuator.

[0070] Alternatively, the sun protection is of the rolling shutter type, comprising a set of slats suspended from each other, the apron thus formed being able to be rolled up onto a winding tube.

[0071] The electromechanical actuator 5 is controlled by a local control unit 12 which may be provided 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. 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 combination of a local control 12 and a central control 13.

[0072] 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.

[0073] 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.

[0074] The electromechanical actuator 5 may comprise a connection to a mains power source or may comprise an autonomous electrical power supply device, such as for example the photovoltaic panel and / or an electrical energy storage device such as the rechargeable battery 4.

[0075] The electronic control unit 15 comprises 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.

[0076] The local control unit and / or the central control unit 13 may be provided with a control keyboard, which comprises selection and possibly display means, and which further allows a user to intervene on the electromechanical actuator 5 and / or the local control unit 12 and / or central control unit 13.

[0077] 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 control units 12 and / or central control units 13. In particular, the control device 104 comprises an external device 200.

[0078] 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 integrates connection pins 214. The control device 104 and more particularly the external device 200, comprises at least a first temperature measurement 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 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 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 this 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 temperature or brightness measurement readings.

[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 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.

[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 of surface.

[0083] The brightness determination means 220 may be a physical sensor, comprising for example a photodiode, a luxmeter, or be composed of one or more cells of the photovoltaic panel.

[0084] The brightness determination means 220 may 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 comprising a first visible light detector and a second infrared or near-infrared light detector. These two detection channels make it possible to obtain two values, which, when combined, provide an irradiance value. The two detectors can be separated or combined into a single sensor, for example comprising two detection channels.

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

[0087] So, as shown in Figure 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).

[0088] An external influence exerted globally by an external environment on the control device depends on whether this influence is applied differently to one or the other of the two sensors. In particular, natural convection introduces a temperature gradient between the bottom and the top of the housing. The temperature gradient is thus determined from the difference in temperature measurement between the two sensors.

[0089] This temperature gradient can be, for example, 2 to 3°C for a housing height of around 10cm. Forced convection, induced for example by wind, can also be perceived. In particular, forced convection tends to reduce the temperature difference between the first sensor and the second sensor.

[0090] Advantageously, the first and second temperature sensors are mounted on a support positioned perpendicular to the plane of the printed circuit 301 of the electronic control unit 222.

[0091] Also, the first sensor 201 and the second sensor 202 are both equidistant from the bottom of the housing.

[0092] The first temperature sensor 201 is placed on a first portion of printed circuit 311 connected by a flexible ribbon to the main printed circuit 301. The first portion of printed circuit 311 is preferably mounted in the housing orthogonally to the main printed circuit 301 and placing the first sensor 201, close to, or even resting on, a side wall 302 of the housing.

[0093] Likewise, the second temperature sensor 202 is placed on a second portion of printed circuit 312 connected by a flexible ribbon to the main printed circuit 301. The second portion of printed circuit 312 is preferably mounted in the housing orthogonally to the main printed circuit 301 and placing the second sensor 202 close to, or even resting on, a side wall 302 of the housing, opposite that in contact with the first sensor 201.

[0094] The external device 200 is intended to be mounted on a facade so that its longitudinal axis is parallel to a vertical axis relative 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 external device 200 mounted on a facade.

[0095] This provision allows:

[0096] Maintain the temperature sensors 201 and 202 independent of the heating of the other electronic components of the printed circuit, Ensure the detection of natural and / or forced convection (wind) around the housing by the first 201 and the second 202 sensors,

[0097] Respect a symmetry of mounting of the two sensors 201, 202: thus, they are both influenced in a predefined and repeatable way by the external conditions, Ensure the equality of the thermal influence of the plastics on the two sensors 201, 202,

[0098] In the absence of wind, the first sensor 201 placed on the bottom of the housing will measure a higher temperature than that measured by the second sensor 202, placed towards the top of the housing. The difference observed can be up to 2 to 3 degrees Celsius.

[0099] In the event of wind, the difference between the temperature data provided by the first and second sensors 201, 202 will be reduced due to the mixing of the air around the housing and the balancing of the temperature of the housing of the control device. The detection of this difference between the temperatures and the reduction of the difference also makes it possible to determine a temperature bias, in particular a temperature bias per sensor, automatically.

[0100] In practice, from 4m / s of wind, 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.

[0101] 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 a temperature of a physical element and not an ambient air temperature.

[0102] This property of the sensors 201, 202 makes it possible to precisely determine 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.

[0103] The outdoor device 200 is advantageously placed outside the building and functions as a weather station insofar as it includes, in particular, the outdoor temperature measuring sensors 201, 202 as well as the brightness determination means 220. The outdoor 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.

[0104] The control device 104 further comprises a display element, not shown, for providing a user with a value of the instantaneous ambient outside temperature T and / or an instantaneous brightness value. The control device 104 further comprises an input element, not shown, for allowing 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 comprise all the hardware and / or software means for implementing the management method which is the subject of the invention.

[0106] 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.

[0107] 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 notably comprises control orders for deployment, i.e. opening, or retraction, i.e. closing of the solar protection.

[0108] 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.

[0109] 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 control modes of the electromechanical actuator 5 as a function of the temperature data or the commands provided by the control device 104.

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

[0111] The management 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 Figure 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 surrounding parameters.

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

[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 brightness readings, to determine an ambient temperature value corrected in relation to the environment in which the control device is placed.

[0118] More specifically, the ambient temperature information is adapted from temperature values ​​from the two sensors 201, 202 and at least one temperature bias based on the temperature values ​​from the two sensors 201, 202, the temporal variation in 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 of power of exposure to solar radiation. In practice, a correction coefficient and a temperature bias are determined per sensor.

[0119] The method implemented by the control device 104 located at least partly outside the building is illustrated in Figure 7 and comprises the following steps:

[0120] A first measurement step E1 in which outside temperature values ​​Ta, Tb from the first, respectively from the second temperature sensor 201, 202 are recorded;

[0121] 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 in temperature for each sensor 201, 202.

[0122] The first measurement step and the first analysis step preferably concern each of the temperature sensors 201, 202 individually. Alternatively, these steps only concern one of the temperature sensors.

[0123] The process also includes the following steps:

[0124] A second measurement step E3 in which brightness values ​​L are recorded;

[0125] A second analysis step E4 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 the at least one correction coefficient;

[0126] A step E6 of determining the ambient temperature value based on the temperature values ​​Ta, Tb from the two sensors 201, 202 and at least one temperature bias;

[0127] A control step E7 by the management unit 102 of the position taken by the solar protection 3 as a function of the ambient temperature value.

[0128] In implementing the method, 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.

[0129] 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.

[0130] The brightness determination means 220 is adapted to provide an irradiance value. In particular, the brightness determination means 220 makes it possible to distinguish a heating of the external casing 200 linked to an increase in the ambient temperature compared to a heating linked to solar radiation on the casing of the device. The correction coefficient is thus initially determined on the basis of a theoretical correction coefficient, for example a value from a database from the temperature and / or brightness input values ​​provided by the sensors. This database is in particular based on laboratory measurements, in the absence of wind.

[0131] Alternatively, or in addition, the correction coefficient can be determined from the analysis of the temperature readings from the first measurement step E1.

[0132] 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 set of situations, the correction coefficient can be defined from several values ​​of correction coefficients previously determined and recorded, i.e. stored in a 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.

[0133] These correction coefficients take into account temperature values ​​in particular conditions, particularly in the absence of direct solar radiation. This absence of direct solar radiation is, for example, determined for irradiance values ​​below 100 W / m 2 . For these values ​​in fact, any observed heating of the housing is of a fairly low value, but the values ​​in play also make it possible to determine that cooling due to the air around the housing is also quite low and is therefore considered negligible.

[0134] To adapt the value of the correction coefficient to the support material of the control device 104, a point correction coefficient based on the derivative of the temperature divided by the irradiance is determined before each temperature measurement and for an irradiance regime between 0 and 100 W / m2. The daily maximum is then stored.

[0135] At each temperature measurement, for example every 30 seconds, the temperature derivative per sensor is calculated.

[0136] A cooling rate per sensor is then defined by this derivative from which we subtract the specific correction coefficient of the corresponding sensor.

[0137] A convection factor N is then calculated, representative of the natural and forced convection of the air around the housing of the control device 104.

[0138] 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):

[0139] [Math 1]

[0140] Coeff corr a - Coeff corr b N = (Ta - Tb)

[0141] With :

[0142] N: convection factor

[0143] Ta, Tb: outside temperature measured by the first sensor 201 and the second sensor 202 t: time

[0144] Coeff corr a, Coeff corr b: Correction coefficient of the first sensor 201 and the second sensor 202

[0145] The temperature bias Tbias is then derived from the following formula:

[0146] [Math 2]

[0147] (cooling rate)

[0148] Tbias = -

[0149] N

[0150] With:

[0151] Tbias: temperature bias

[0152] Cooling Rate: Cooling rate of the first sensor or second sensor

[0153] N: convection factor

[0154] 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.

[0155] 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 lowest of these data. In the vast majority of cases, due to the bias determinations according to the method, the two adjusted temperature data will be quite close to each other, but due to the phenomenon of natural convection, the lowest adjusted temperature will be that provided by the first sensor located at the bottom of the housing.

[0156] The implementation of the method can thus make it possible to adapt the behavior of the solar protection on the basis of a provided ambient temperature which is precise and which adapts to each environment. The management method can be implemented without any particular action by the user of the building, the control device 104 being energy autonomous and self-adapting to its support in a few days. The value of the correction coefficient can be updated to a theoretical value if, for example, the control device is moved and used in another environment. Of course, the invention is not limited to the embodiments described and shown in the appended 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) for a position taken by the solar protection (3) over time, and at least one control device (104) comprising at least one first sensor (201) for measuring a temperature outside the building (1), at least one second sensor (202) for measuring a temperature outside 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 (E1) 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 method also comprising 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 brightness values ​​recorded; A step of determining (E5) at least one temperature bias based on the temperature values ​​from the temperature sensors (201, 202), the temporal temperature variations and the at least one correction coefficient; A step of determining (E6) the ambient temperature value based on the temperature values ​​from the temperature sensors and the at least one temperature bias; A control step (E7) by the management unit of the position taken by the solar protection (3) as a function of the ambient temperature value.

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

3. Management method according to any one of the preceding claims, in which 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, in which 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, in which the first correction coefficient, respectively the second correction coefficient, is determined as a function of a history of the values ​​of the first correction coefficients, respectively of the second correction coefficients.

6. Management method according to any one of claims 3 to 5, in which 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, on a plurality of pre-recorded correction coefficient values.

7. Management method according to any one of claims 3 to 6, in which daily values ​​of the first correction coefficient are stored as data in a first memory table, and once the first memory table is complete 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 complete 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. Management method according to claim 7, in which daily values ​​of the first correction coefficient are stored in the form of data in a first memory table and once the first memory table is complete 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 in the form of data in a second memory table and once the second memory table is complete with second correction coefficients determined, any new daily value of the second correction coefficient replaces the oldest data.

9. Management method according to one of the preceding claims, in which the second analysis step (E4) is carried out for low irradiance values, in particular for irradiance values ​​of less than 100 W / m 2 .

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

11. Control device (104) for 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 the 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 arranged 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, in which the first and second sensors (201, 202) are in contact with the housing.

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

14. Control device (104) according to one of claims 11 to 13, in which the brightness determining means 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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