SE469808B - Device for room temperature control - Google Patents

Description

15 20 25 30 35 469 888 zone number, sufficient heating power can be supplied.

This object is achieved by giving the invention the features stated in claim 1.

In this design, each control device receives a control instruction corresponding to its address and stores it. Thereafter, the control device operates independently. The operation of the associated control elements thus takes place regardless of which output data the main microprocessor sends out in the meantime. At the same time, heat output can be transferred via the control lines to each heat resistor that is connected via an associated control element. Regardless of the number of zones, the maximum power can be applied to each of all heat resistors distributed over 100% of the present cycle time.

The heating current and the load on the heat resistors are correspondingly low.

The digital output data, ie address and control instructions, can easily be stamped on the supply line voltage as well as on the supply line current. These individual pieces can be followed by each other very quickly. Thus, both in terms of data and power, a very large number of control devices can be connected to the supply lines. The storage in the sub-microprocessor also allows the operation of each zone to be maintained with the latest data in case the main microprocessor should fail. In the state of the art, on the other hand, a loss of the main microprocessor also leads to a loss of heat pulses and thus to a loss of the entire control device.

All in all, this results in a device with greater flexibility, which is particularly well suited for practical use.

Since output data, which in addition to address and instruction can also contain other information, is continuously calculated and entered by the main microprocessor, namely the current setpoint for each thermostat can be constantly changed, both abruptly and continuously. The main microprocessor primarily takes into account the setpoint program stored for each zone. Because these programs override a setpoint for the thermostats, the user can change the baseline of these programs according to their own preferences by setting these setpoints. The extra arrangements in each zone are relatively small, as the control device and the associated control element can be easily constructed. The submicroprocessors can easily translate individual instructions into corresponding switching times and the like.

Voltage gaps can be easily generated, for example by a coupling means, and are easily registered. Since they are located in the vicinity of the zero points, they do not constitute a break in the applied electrical power.

In the further development according to claim 2, the control device only needs to control the changeable switch-off time. A simple switching transistor is suitable as a control device.

The two-conductor system according to claim 3 requires extremely low management and installation costs.

In the embodiment according to claim 4, the main microprocessor can also connect and disconnect pumps, fans and other work units in a timely manner, the control following a similar data structure as with the thermostats.

With the further development according to claim 5, a short circuit or an interruption in the area of the heat resistance can be determined in a timely manner.

The invention will be explained in more detail below in preferred embodiments with the aid of the accompanying drawings. Fig. 1 then schematically shows a block diagram of a device according to the invention.

I) Fig. 2 shows a valve thermostat attachment and associated control device.

Fig. 3 shows a diagram of the intermittent supply of electrical power.

Fig. 4 shows a time diagram of the change of the current setpoint in relation to the daily setpoints TS at rapid heating.

Fig. 5 shows in a time diagram the change of the current setpoint in relation to daytime setpoints TS at a comfort heating in the evening.

Fig. 6 shows as the function of the outdoor temperature To the change of the current setpoint in relation to day setpoints TS for correction of the proportional errors.

Fig. 7 shows in a daily diagram a curve for a setpoint program sequence, in which the deviation of the current setpoint from the thermostat's setpoint ES is shown.

Fig. 8 shows in a time diagram the electrical voltage U1 with imprinted voltage gap.

Fig. 9 shows a varied embodiment of the device according to Fig. 1.

Fig. 1 shows a main microprocessor 1 arranged in a central Z, which is provided with a setpoint program layer 2. By means of the setting buttons 3, program runs can be stored for zones I, II and III of a hot water heating system, in particular also times, sizes and inclination angles for the changes. 10 15 20 25 30 35 469 808 Furthermore, an outdoor temperature sensor 4 is connected to the main microprocessor 1. The inputs 5 are arranged for the supply of additional values, eg the internal temperature, the wind speed, the position of the sun and the like. The main microprocessor 1 has several outputs 6, over which various plant parts can be controlled, for example circulation pumps, a priority circuit for hot water, a rapid heating of the basement, the night lighting and the like.

For the regulation that is interesting here, output 7 is important. over this, the output data D is given to the coding device 8.

Output data includes at least one address for the individual zones I, II and III and an instruction, which characterizes the magnitude of an electrical effect. As a rule, however, output data also includes additional information, such as synchronization signals, temperature information and the like. This is digital output data, which in the coding device is imprinted with a current I, which flows in the two cables 9 and 10 in a two-conductor system 11. At a source of AC voltage a double-rectifier 12 is connected, so that in the two-conductor system 11 flows a rectified alternating current corresponding to Fig. 8. The coding device 8 has a contact means which either (a) does not affect the zeros of the voltage half-arcs at all or (b) supplies them with a wide voltage gap or (c) with a narrow voltage gap. The wide voltage gap can, for example, correspond to values 1, and the narrow voltage gap can correspond to the value 0.

The hot water heating system has several thermostatic valves 13, which are arranged in several zones I, II and III to a housing, which is to be heated. As a rule, there are more than the displayed zone number, eg eight zones. In the exemplary embodiment, each zone corresponds to one room and therefore contains only one thermostat valve. However, it can also include several rooms, whereby the current setpoint must be affected similarly to a zone with several thermostat valves. The thermostat valve 13 has a housing 14 and a thermostat attachment 15. The working working element internal to this additive is connected via a capillary tube 17 to a temperature sensor 17, which is located in a housing 18. When the sensor 17 has a liquid vapor filling, the temperature-dependent vapor pressure acts in the working element of the additive and the valve assumes an equilibrium position, because a setpoint spring acts in the opposite direction of the working element. The attachment has a rotary handle 19, with the aid of which the setpoint value ES of the thermostat valve can be changed, ie for example the setpoint spring can be set. When the sensor 17 has a liquid filling, the position of the working element in the attachment can be changed by means of the rotary grip 19.

An electrical heat resistor 20 abuts at the sensor 17, which can be supplied via the two-conductor system 11 with a current dependent on the half-arc voltage U1 in Fig. 8, when a control element in the form of a contact means 21, for example a contact transistor, is controlled in the conductive state. The control takes place by means of a control device in the form of a sub-microprocessor 22, to which is connected a decoding device 23 which can also form part of this microprocessor 22. The decoding device 23 senses the zeros of the half-bags U1, forms the bits thereof and stores the values which are associated with addresses of the associated zone. Due to information received for this section, the contact means 21 is brought to a conductive state. The switch-off time is controlled time-dependent due to the stored instruction data shown in Fig. 3. The individual block corresponds to separate half-arcs. The switch-on time is determined by the clock time of fifteen seconds. It is seen that the connection duration decreases in the block row sequence d, e, f and g so that the heating of the sensor 17 can be changed in this way by the heat resistance 20.

The housing 18 accommodates the said parts 17, 20, 21, 22 and 23.

The setpoint value of the thermostat valve ES, which is set when the heat resistance is not effective, has a higher value than that desired by a user during normal daytime hours. In the diagram in Fig. 7 it is shown, f) 10 15 20 25 30 35 469 808 that the eigenvalue value, for example, is 23 ° C, while the daily setpoint value is only 21 ° C. This reduction of 2 ° C is achieved by means of the heat resistance 20. The setpoint value TS is therefore composed of two components, the intrinsic setpoint ES and the heat resistance 20 which supplies electrical power. If you change the electrical power, the reduction changes in relation to the setpoint. If you change the setpoint, the total setpoint program is shifted.

Since it is already very necessary to add a heating effect to achieve the fair value, the current fair value can not only be reduced in relation to the fair value, but also increased. When a heating power corresponding to block e in Fig. 3 is necessary, for example to achieve the daily setpoint, the current setpoint can be increased by reducing the heating power corresponding to blocks f and g.

A control characteristic operating with such an increase is shown in Fig. 4. It is shown there, on the basis of the daily setpoint TS, that the current setpoint is raised abruptly by 1.5 ° C and later over a sloping function is gradually returned to the setpoint. The setpoint increase occurs half an hour before the time of pending use (hour 0) and remains unchanged for another hour after use. Then the setpoint is returned linearly in the course of another hour. An incoming user finds the room comfortably heated.

The cooling potential from the walls cooled during the night is reduced as quickly as possible. The gradual return of the temperature takes place practically unnoticed by the user.

Fig. 5 shows a comfort control in a time diagram. In the evening, the current setpoint is gradually increased over the course of three hours, ie here between 19 and 22, by 1.5 ° C above the daily setpoint TS.

Thereafter, this elevated setpoint remains unchanged, for example until 24 o'clock. When ascending, it is taken into account that a sedentary person feels a slightly higher temperature more pleasantly than a person who moves and works. This temperature rise is canceled when the user withdraws to go to sleep.

Fig. 6 shows, as a function of the outdoor temperature To, that the temperature can be varied by 1 ° C. During an outdoor temperature of -Q ° C the correction is obtained 0. Above + 9 ° C the correction is obtained 1 °. Between these two outdoor temperatures, the correction temperature rises evenly. In this way, the p-band error of the thermostatic valves is compensated.

Fig. 7 shows a curve P with the program sequence from 0 to 24.

The daily setpoint is 2 ° C below the thermostat's setpoint. In this case, a basic lowering of 1.5 ° C is taken into account. At night, there is a night decrease of 9 ° C between 24 and 4 in relation to the setpoint, ie eg 15 ° C. This is achieved by strong heating of the sensor 17. At 4 o'clock there is an increase to the setpoint and at 6.30 a further rise of 1.5 ° C, because at 7 the first user of the room is expected. Section h of the curve P therefore corresponds to Fig. 4. From 9 am to 7 pm, the normal daily setpoint TS is set. Then there is a gradual increase of 1.5 ° C to increase the feeling of comfort. Part g of the curve P therefore corresponds to Fig. 5. A cold phase A1, a heating phase A2, a hot phase A3 and a cooling phase A4 are therefore obtained.

The duration of the heating phase A2 depends on how much the room in question has been cooled in advance, and what heat-accumulating properties the room and the heating system have, respectively.

Fig. 7 shows a curve branch P1 dashed with which the setpoint rises evenly along an inclined function in the heating phase A2.

All inclined functions are drawn as straight lines. However, they can also be composed of small steps. The entire system is preferably operated with a mains frequency and a reduced voltage to, for example, 24V. In one embodiment, the main microprocessor 1 operated so that every three seconds it transmitted new output data to the individual sub-microprocessors 22. This data is stored and deleted when new data occurs. However, only the data transmitted as the last before the end of the 15-second cycle was used.

The main microprocessor can also register the mains voltage and, depending on any mains voltage fluctuations, change the length of the current blocks de and was supplied to the main microprocessor 1 via an input 5.

Fig. 1 also schematically shows how a monitoring device 24 measures the voltage drop across a resistor 25 in series with the heating resistor 20 during the power supply and when deviating from the measured value from a predetermined range emits an error signal for activating a light signal sensor. 26.

The user of the room can therefore detect the faults if the heat resistance is short-circuited or there is a power failure.

Fig. 9 shows that not only the control device 22 for the thermostat valves 15 of the radiators 27 is connected to the two-conductor system 11, but also additional control devices 28-34 for additional work units which have an in-out function. By way of example only, these additional control devices have the following purpose: The additional control device 28 engages a frost protection device. The auxiliary control device 29 switches on the fuel and / or air supply for a boiler 35. The auxiliary control device 30 connects a circulation pump 36 for heating a domestic water heater 37. The auxiliary control device 31 operates via a control device 38 and for such activation of the mixing valve 39 quickly increases.

The auxiliary control device 32 engages a circulation pump 40 in the supply circuit. The additional control device 33 can be used for switching on the lighting. The additional control device 34 serves to connect a fuse. The additional control devices are also controlled by an address in the output data D and are switched by an instruction contained in the output data as well. In a concrete heating system, it is only necessary to install the additional control device necessary for this. The main microprocessor 1 in the control panel Z certainly has the possibility of controlling all the additional control devices except the control device 22 for the thermostatic valve 15; however, these opportunities do not have to be fully exploited.

It should not be possible to see that the thermostat is set to a higher setpoint than the setpoint. You only need to have the scale set on the thermostat corresponding to the 2 ° C reduction caused by the heating. f)

Claims (5)

10 15 20 25 30 35 11 469 808 PATENT CLAIMS Device for room temperature control by means of thermostats, in particular a hot water heating system thermostatic valves (13), the sensors (17) of which are each assigned a heating resistor (20) and which have an adjustable setpoint, with a control element (2) controlling the supply of electrical power to the heating resistors (20), a central control device (1) provided with a setpoint program memory being arranged in a central unit, which emits control orders for supplying electrical power to the thermostats (17, depending on the setpoint program and any additional input values). 20), wherein zones (I, II, III) with differently adjustable switching temperature are provided with a thermostat or with several similarly actuating thermostats, and each zone is assigned a sub-control device (22) for the control element operation, wherein all the heat resistors are common , the electrical power supply supply lines also connect the main control device (1) to the sub-control means (22) for the transmission of control orders, and wherein the output of the main control device is provided with an encoder (8), which characterizes the supply line voltage a sequence of digital output data, each comprising the address of a zone and a control order, and wherein the sub-control devices were and one has a decoder (23) and stores a control order corresponding to its own address and, depending on this, operates at least one control element (21), characterized in that the main control device (1) is formed by a main microprocessor and the sub-control devices (22) are formed of sub-microprocessors, that the supply lines (9, 10) are connected via a full-wave rectifier (12) to an AC voltage source (U), that the coding device (8) characterizes bit by bit the rectified AC voltage in the region of its zero points with the main microprocessor (1) ) output data (D) as voltage gaps (b, c) with two different widths and that the decoder (23) registers voltage gaps but and their width and hence the current bit. 469 808 10 15 20 25 12 f The device according to claim 1, characterized in that the control element (21) is a contact member which with control devices (22) can be switched on in conductive conditions with a certain switching frequency but with variable switching duration. The device according to claim 1 or 2, characterized in that the supply lines (9, 10) form a two-conductor system. Device according to claim 3, characterized in that additional control devices (28-34) for work units, each having an input-output function over the two-conductor system (II), are connected to the main microprocess (1) and can likewise be activated by a address and an order containing output data. Device according to one of Claims 1 to 4, characterized by a measured resistance resistor (25) which is connected in series with the heating resistor (20) and by a monitoring device (24) which measures the voltage drop across the measured value resistor and emits an error signal, when the voltage drop falls below a lower limit or rises above an upper limit.