FR3040092A1 - Electronic device for controlling an electrical heating using a temperature sensor influenced by the heating elements - Google Patents

Electronic device for controlling an electrical heating using a temperature sensor influenced by the heating elements Download PDF

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Publication number
FR3040092A1
FR3040092A1 FR1570019A FR1570019A FR3040092A1 FR 3040092 A1 FR3040092 A1 FR 3040092A1 FR 1570019 A FR1570019 A FR 1570019A FR 1570019 A FR1570019 A FR 1570019A FR 3040092 A1 FR3040092 A1 FR 3040092A1
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France
Prior art keywords
temperature
control
characterized
device according
heating elements
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Pending
Application number
FR1570019A
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French (fr)
Inventor
Richard Thibert
Original Assignee
Richard Thibert
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Publication date
Application filed by Richard Thibert filed Critical Richard Thibert
Priority to FR1570019A priority Critical patent/FR3040092A1/en
Publication of FR3040092A1 publication Critical patent/FR3040092A1/en
Application status is Pending legal-status Critical

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Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/1917Control of temperature characterised by the use of electric means using digital means
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B1/00Details of electric heating devices
    • H05B1/02Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227Applications

Abstract

The invention relates to a device (1) for regulating electric heating without requiring a remote temperature probe or insulated from the heating elements. It consists of a temperature sensor (5) placed near the heating elements (8) and / or the control (6), means for regulating (4), compensation (2), learning ( 3) and the control (6) of the heating equipment (8). The temperature of the part is determined by compensation (2) of the temperature measured by the probe (5) as a function of the value of the signal of the control (6) and parameters determined automatically by learning (3). The control signal of the heating elements (8) comes from the control (4).

Description

ELECTRONIC DEVICE FOR CONTROLLING ELECTRICAL HEATING USING TEMPERATURE SENSOR INFLUENCED BY THE HEATING ELEMENTS

The present invention relates to the field of electric heating and more particularly relates to a device for controlling electric heating elements to obtain the desired temperature without requiring a remote temperature sensor or isolated from the heating elements.

In the implementation of an electric heating, ie using joule electric heating elements generally called radiators, it is necessary to control the heating elements (radiators, baseboard heaters, floors or heating walls ... ) so that the temperature felt by the occupants is pleasant.

This command, called overall control, aims to obtain the desired temperature in the housing.

The heating elements can be controlled "all or nothing" or "power variation". The variation of power makes it possible to have a constant temperature of the heating element (8) and thus to avoid creating temperature fluctuations in the room (11). The power variation is often achieved by "all or nothing" on short time periods compared to the thermal inertia of the heating system thus ensuring a constant perceived heating.

It is important that the control is of quality because if the commanded power is too important or not regular the temperature will exceed the desired value or will not be constant, reducing the comfort and increasing the consumption of energy. Conversely if the command is too weak the temperature will be too low.

The quality of the regulation is based on the relevance of the temperature measured in the room.

As illustrated in Figure 2, the electric heating control devices (9) use one or more temperature sensors (10) to measure the temperature Tp of the workpiece (11).

To measure the temperature of the part Tp, the probes (10) must not be disturbed by the heat emitted by the heating elements (8). The probes are thus positioned at a distance from these and, if possible, at a location representative of the temperature felt by the occupants, for example at a height between 80 cm and 150 cm from the ground on an interior wall.

Thus, the temperature Tm measured by the probe (10) is assumed to be very close to or identical to the "sensed" air temperature, that is to say the temperature of the piece (11).

To achieve this, the temperature probes (10) are positioned on the walls or placed on the furniture and communicate with the regulation (9) with or without wire.

On some electric radiators, the probe (10) is placed for example on the sides of the radiator thus hoping to be slightly impacted by the air heated by the radiator.

This measurement of the temperature is essential for the algorithm implemented in the regulation module (9) because it is as a function of the temperature Tp of the room air (11) that the control of the elements will be determined. heaters (8) so that the measured temperature corresponds to the desired temperature called the set temperature T J-c ·

Many regulatory algorithms have been developed, for example the popular Proportional-Integral-Derivative, self-adaptive algorithms or more recently the predictive controls.

All these algorithms control the heating elements to make the set temperature Tc coincide with the measured temperature Tm. The temperature Tm must not be biased because the control algorithm will control the heating elements on the basis of erroneous information and the room temperature will not be the expected one. However, this approach has disadvantages: • It is sometimes very difficult to position a probe (10) at a place where the measured temperature is representative. Indeed, if it is illuminated by the sun, too close to a source of heat (oven, lighting), on a cold wall ... the measurement can be strongly biased; • the temperature probes (10) positioned on the walls are unsightly; • It is necessary to ensure the communication between the probe (10) and the regulation (9) either with son to be installed, or wirelessly with generally batteries in the probe; • if, to avoid the above points, the probe (10) is placed near the heating elements (8), the regulation is poor because the measured temperature is strongly biased; • the probe (10) is usually placed on an electronic card which must not release heat so as not to interfere with the measured temperature, this constrains the design of the card and its functionalities which may in particular fail to provide the power control portion; • Finally, a change in temperature may take some time to be perceived by the probe because the air near the probe is static given its optimum placement away from all sources of heat or cold.

All these points would be solved if it were possible to place the temperature probe (10) close to the heating elements (8) and obtain a fair measure of the room temperature. The invention comes to propose a solution.

PRESENTATION OF THE INVENTION

The accompanying drawings illustrate the invention: FIG. 1 represents the device and its environment; • Figure 2 illustrates the operation of a conventional electric heater; • Figure 3 illustrates the impact of heating control on the measured temperature with an influenced probe of the heating elements; • Figure 4 illustrates the communication between the device and the Internet network.

With reference to these figures, the invention is an electronic device (1) for controlling an electric heating means (8) comprising one or more microcontroller electronic cards or programmable logic array or equivalent active components, a probe of temperature (5) which can be a directly digital sensor or an analog sensor (for example a thermistor) whose value is digitized, means allowing the regulation (4), the compensation (2), the learning (3) and the connection to equipment controlled through a control component such as relays, triacs, thyristors or equivalents (6).

The temperature sensor (5) is placed near the heating elements (8) and / or the control components (6), the temperature of the room Tp (t) is determined by compensation (2) of the temperature Tm (t). ) measured by the probe (5) as a function of the value of the signal C (t) of the control (6) and parameters Pl..n.

The parameters Pl..n are determined automatically by learning (3) by analyzing the measured temperature Tm (t) as a function of the control signal C (t). The control signal C (t) is determined by the control (4) as a function of the difference between the temperature of the room Tp (t) resulting from the compensation (2) and the desired temperature Tc (t).

Several temperature probes can be used for compensation and / or learning. Communication means (12) using a remote control for modifying parameters such as the set temperature can be implemented, these means being able to use the internet network. The regulation (4) uses, for example, a Proportional-Integral-Derivative mechanism.

A visual indicator indicating the state may be present. It is conceivable that the device (1) can communicate with other similar devices to coordinate the temperature in several rooms.

The device (1) can be in certain implementations grouped on a single electronic card. The power actually consumed by the heating elements (8) can be measured. Learning (3) can force a specific command C (t) to determine the parameters Pi..n. The invention therefore makes it possible to use a temperature sensor (5) in the vicinity of the heating element (8) and / or an electronic card that dissipates heat and control elements (6) while being capable of to know the temperature of the part Tp and thus to ensure a powerful regulation.

For this it implements: a temperature sensor (8) which measures a temperature Tm different from that of the part Tp since it is influenced by the heat emitted in the vicinity; • a compensation mechanism (2), provided for example by a computer code, which determines the temperature of the part Tp; • a learning mechanism (3) provided for example by a computer code that determines how to perform the compensation including estimating the impact of heat sources on the probe. ; A regulation mechanism (4), provided for example by a computer code, which determines the value of the command C (t), where a variation command C (t) can indicate the control signal duty cycle which has the following effect: objective of minimizing the difference between the set temperature TCr and the temperature of the workpiece Tp; A control (6), provided by a mechanical relay, static, or power components such as a triac, controls the heating of the heating element (8) by controlling the passage of the electric current in the power supply thereof . ; • a communication interface (12) which allows the user to set the Tc setpoint and possible scheduling or other system settings and a feedback on the operation of the device (1).

Since the probe (5) is placed near the heating element (8) and / or the control system (6), the value of the measured temperature Tm is not the temperature of the room Tp but a higher temperature given the influence of nearby heat sources. The invention consists in taking into account the heat emitted by these sources to correct the value of the measured temperature Tm in order to determine the temperature of the part Tp.

This is possible because it is the control (4) that controls the heat emitted by these sources. Indeed, the control (4) actuates the control (6) connected to the heating element (8), so the control power is available within the device (1).

Therefore by using the control signal C (t) and knowing its impact on the measured temperature Tm it is possible to correct the measured value of this influence.

Thus, the compensation (2) consists in determining the temperature of the part Tp as a function of the measured temperature Tm, the control of the heating element C (t) and parameters Pi..n which characterize the impact on the probe of the heating element and heat sources related to the regulation and located nearby.

Some commands (6) make it possible to know the power actually consumed by the controlled elements (8). This allows eg servo control. In this case it is possible to have two values for the command C: the desired value and the measured value. The compensation will then use the measured value since it determines the heat emitted.

It is also possible to correct the measured temperature Tm according to fixed parameters such as the height of the probe in the room.

Thus, if we consider only a state of equilibrium where the temperatures are stabilized:

The function f can be an estimator of the second order of the temperature Tp of the room, the parameters Pi, P2, P3 then being dependent on the command C:

The parameters Pi..n necessary for the correction of the temperature depend on many factors and can not be predetermined simply. The learning (3) allows their self-determination from the measured temperatures and the control of the heating elements. This is made possible in particular when the thermal inertia of the room is significantly different from that of the heating elements.

Figure 3 shows the temperatures Tm, Tp and control C for a conventional installation. One distinguishes the rapid rise in temperature Tmde the probe during the control of the heating element, the temperature of the room evolving much more slowly.

A learning mechanism (3) can thus determine the value of the parameters Pi..n representing the impact of a command C on the measured temperature Tm. For this it can use a second order statistical regression over a period of time when the influence of the temperature of the room is negligible. By repeating this measurement for different values of C, the set of parameters Pi..n can be determined.

A mathematical modeling of the heat exchanges between the heating elements, the room and the probe also offers an interesting model, particularly in situations where the temperatures are not stabilized.

To improve learning, it may be useful to perform a specific control of the heating elements to determine the parameters Pi..n. This can lead to a "learning" mode where the device no longer seeks to control the heating but to determine the impact parameters. This mode can be implemented, for example, after installation during a learning phase of a few hours to have an initial value of the parameters.

Placing the probe (5) near the heating elements (8) ensures convective airflow around the sensor. Thus, the corrected measurement is more reactive than that of a probe placed in a place without air circulation. This can lead to filtering the measured temperatures Tm by a "low pass" or an "averager" so as not to disturb the regulation with insignificant temperature variations.

Moreover, communication means (12) in particular make it possible to define the setpoint temperature Tc, time schedules, a particular behavior such as frost-free operation. . .

This communication can be rudimentary with for example a knob, keys or a remote control in the spirit of that of air conditioners.

It can also use a computer connection (16), for example of the Ethernet or wifi type then allowing a complete interface using the internet network (15) and a server (14).

The server (14) is used to record information collected by the device (1), such as temperature, control power. For this purpose, the device (1) periodically transmits the corresponding data via a computer connection, for example of the TCP / IP type. Conversely, if control related parameters such as the set temperature or programming ranges are changed within the server (14), the device is informed and can take into account the new parameters.

To interact with the device (1), it is then possible to use a terminal (13), for example an internet browser, a smartphone, a tablet or any other equivalent device.

The server (14) allows communication with the terminals (13) without being on the same computer network as the device (1). Thus, it is possible to consult information on the operation of the system and to control it remotely.

Claims (9)

  1. An electronic device (1) for controlling an electric heater (8) comprising one or more microcontroller electronic cards or programmable logic array or active components, a temperature sensor (5) which can be a directly digital sensor or an analog sensor (for example a thermistor) whose value is digitized, means allowing the regulation (4), the compensation (2), the learning (3) and the connection to the heating elements (8) through a component of relay-type, triac, thyristor (6) control characterized in that: • the temperature sensor (5) is influenced by the heating elements (8) and / or the control components (6), • the room temperature Tp (t) is determined by compensation (2) of the temperature Tm (t) measured by the probe (5) as a function of the value of the signal C (t) of the control (6) and parameters Pi..n, • The parameters Pi..n are automatically determined by learning (3) by analyzing the measured temperature Tm (t) as a function of the control signal C (t), • the control signal C (t) is determined by the regulation (4) as a function of the difference between the temperature of the part Tp (t) resulting from the compensation ^) and the desired temperature Tc (t).
  2. 2. Device according to claim 1 characterized in that several temperature probes are used for compensation and / or learning.
  3. 3. Device according to one of claims 1 and 2 characterized in that communication means (12) using the Internet are implemented to interact with the user.
  4. 4. Device according to one of claims 1 to 3 characterized in that the regulation (4) uses a Proportional-Integral-Derivative mechanism.
  5. 5. Device according to one of claims 1 to 4 characterized in that the communication means (12) use a remote control to change parameters such as the set temperature.
  6. 6. Device according to one of claims 1 to 5 characterized in that it comprises, a visual indicator indicating its state.
  7. 7. Device according to one of claims 1 to 6 characterized in that it communicates with other devices to coordinate the temperature in several rooms.
  8. 8. Device according to one of claims 1 to 7 characterized in that it is grouped on a single electronic card.
  9. 9. Device according to one of claims 1 to 8 characterized in that the power actually consumed by the heating elements (8) is measured. 1Θ.Device according to one of claims 1 to 9 characterized in that for learning (3) a specific command C (t) is forced to determine the parameters Pi .. ".
FR1570019A 2015-08-12 2015-08-12 Electronic device for controlling an electrical heating using a temperature sensor influenced by the heating elements Pending FR3040092A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR1570019A FR3040092A1 (en) 2015-08-12 2015-08-12 Electronic device for controlling an electrical heating using a temperature sensor influenced by the heating elements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1570019A FR3040092A1 (en) 2015-08-12 2015-08-12 Electronic device for controlling an electrical heating using a temperature sensor influenced by the heating elements

Publications (1)

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FR3040092A1 true FR3040092A1 (en) 2017-02-17

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FR1570019A Pending FR3040092A1 (en) 2015-08-12 2015-08-12 Electronic device for controlling an electrical heating using a temperature sensor influenced by the heating elements

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009133283A2 (en) * 2008-04-03 2009-11-05 Societe Muller & Cie Method for the self-balancing of a heating device
CA2779415A1 (en) * 2008-10-31 2010-05-06 Optimum Energy, Llc Systems and methods to control energy consumption efficiency
US20100262298A1 (en) * 2009-03-27 2010-10-14 Siemens Energy & Automation, Inc. System and Method for Climate Control Set-Point Optimization Based On Individual Comfort
US20110184565A1 (en) * 2010-01-22 2011-07-28 Honeywell International Inc. Hvac control with utility time of day pricing support
US20120072033A1 (en) * 2009-08-21 2012-03-22 Imes Kevin R Auto-adaptable energy management apparatus
US20120185101A1 (en) * 2011-01-13 2012-07-19 Honeywell International Inc. Hvac control with comfort/economy management

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009133283A2 (en) * 2008-04-03 2009-11-05 Societe Muller & Cie Method for the self-balancing of a heating device
CA2779415A1 (en) * 2008-10-31 2010-05-06 Optimum Energy, Llc Systems and methods to control energy consumption efficiency
US20100262298A1 (en) * 2009-03-27 2010-10-14 Siemens Energy & Automation, Inc. System and Method for Climate Control Set-Point Optimization Based On Individual Comfort
US20120072033A1 (en) * 2009-08-21 2012-03-22 Imes Kevin R Auto-adaptable energy management apparatus
US20110184565A1 (en) * 2010-01-22 2011-07-28 Honeywell International Inc. Hvac control with utility time of day pricing support
US20120185101A1 (en) * 2011-01-13 2012-07-19 Honeywell International Inc. Hvac control with comfort/economy management

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