EP3277879B1 - An ironing appliance with means for controlling the heating power - Google Patents
An ironing appliance with means for controlling the heating power Download PDFInfo
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- EP3277879B1 EP3277879B1 EP16711647.4A EP16711647A EP3277879B1 EP 3277879 B1 EP3277879 B1 EP 3277879B1 EP 16711647 A EP16711647 A EP 16711647A EP 3277879 B1 EP3277879 B1 EP 3277879B1
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- Prior art keywords
- temperature
- soleplate
- heating power
- heating
- heating element
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- 238000010438 heat treatment Methods 0.000 title claims description 234
- 238000010409 ironing Methods 0.000 title claims description 39
- 230000007423 decrease Effects 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F75/00—Hand irons
- D06F75/08—Hand irons internally heated by electricity
- D06F75/26—Temperature control or indicating arrangements
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Irons (AREA)
- Control Of Temperature (AREA)
- Control Of Resistance Heating (AREA)
Description
- The present invention relates to an ironing appliance and a method for controlling an ironing appliance.
- A typical conventional ironing appliance uses a soleplate that comes in contact with the garment during ironing. The soleplate is typically heated by a heating element associated with a device such as a thermostat or thermistor, with the aim of heating the soleplate to a set temperature. Conventionally the heating element is controlled by switching it to be at maximum power or off with reference to the set temperature. Typically, the heating element is controlled to be at maximum power until the temperature of the soleplate reaches the set temperature, at which point it is turned off.
- The limitation of such conventional methods of temperature control is that there will be considerable temperature overshoot as the soleplate is heated due to "heat mass inertia" of the soleplate. In other words, if the soleplate is heated by the heating element until the set temperature is reached, the temperature of the soleplate will keep rising for a period of time, even with the heating element being off. This problem of overshoot is made worse when using higher heating powers and lighter masses of the soleplate.
- Also, after the temperature overshoot, the temperature of the soleplate will eventually fall back towards the set temperature. Once the temperature of the soleplate reaches the set temperature again, the heating element is controlled to have maximum power again. However, it will be appreciated that there will be temperature undershoot as the temperature of the soleplate keeps falling past the set temperature, before the temperature of the soleplate rises again.
- As a result, the temperature of the sole plate will be continually cycled, going from below the set temperature to above, and back below. As a result, controlling the heating element to be either at maximum power (when below the set temperature) or off (when above the set temperature) results in non-precise temperature control.
- It is to be noted that Japanese patent publication
JP2966505B - It is therefore an aim of the present invention to provide an improved ironing appliance that overcomes these problems.
- It is an object of the invention to propose an improved ironing appliance that avoids or mitigates above-mentioned problems.
- The invention is defined by the independent claims. The dependent claims define advantageous embodiments.
- According to the present invention, there is provided an ironing appliance comprising: a soleplate; a heating element for heating the soleplate; a temperature sensor for sensing a temperature of the soleplate; a controller adapted to a) determine a temperature gradient of the soleplate as a rate of change of the temperature of the soleplate over time, and a temperature difference between said temperature of the soleplate and a first predetermined temperature, b) control the heating power of the heating element based on said temperature gradient and said temperature difference. The controller is arranged to control the heating element to use a first heating power when temperature of the soleplate is less than a second predetermined temperature that is lower than the first predetermined temperature, and to control the heating power of the heating element based on said temperature gradient and said temperature difference when the temperature of the soleplate is between the second predetermined temperature and the first predetermined temperature; and wherein, if said temperature gradient is positive, the controller is arranged to control the heating power of the heating element so that the heating power decreases for increasing values of the temperature of the soleplate from the second predetermined temperature to the first predetermined temperature, wherein this decrease in heating power is larger for larger positive temperature gradients, and if said temperature gradient is negative, the controller is arranged to control the heating power of the heating element so that the heating power decreases for increasing values of the temperature of the soleplate between the second predetermined temperature and the first predetermined temperature, wherein this decrease in heating power is larger for smaller negative temperature gradients.
- By determining a temperature gradient of the soleplate and a temperature difference between a temperature of the soleplate and the first predetermined temperature, and by controlling the heating power of the heating element based on the temperature gradient and the temperature difference, the soleplate can be heated in a way that minimises overshoot and undershoot of temperature. Also, below the second predetermined temperature, the controller can control the heating element at a set power (e.g. maximum). This simplifies the control method.
- In some embodiments, the controller is arranged to control the heating power of the heating element by either varying the time duration the heating element is turned on in a given time period with a constant electrical power supplied to the heating element, or by varying the electrical power supplied to the heating element.
- The controller is arranged to control the heating element to use a first heating power when temperature of the soleplate is less than a second predetermined temperature that is lower than the first predetermined temperature, and to control the heating power of the heating element based on said temperature gradient and said temperature difference when the temperature of the soleplate is between the second predetermined temperature and the first predetermined temperature. Hence, below the second predetermined temperature, the controller can control the heating element at a set power (e.g. maximum). This simplifies the control method.
- In some embodiments, the first heating power is a maximum heating power. This maximises the speed of the heating of the soleplate.
- If said temperature gradient is positive, the controller is arranged to control the heating power of the heating element so that the heating power decreases for increasing values of the temperature of the soleplate from the second predetermined temperature to the first predetermined temperature, wherein this decrease in heating power is larger for larger positive temperature gradients.
- If said temperature gradient is negative, the controller may be arranged to control the heating power of the heating element so that the heating power decreases for increasing values of the temperature of the soleplate from the second predetermined temperature to the first predetermined temperature, wherein this decrease in heating power is larger for smaller negative temperature gradients.
- The controller is also arranged to control the heating power of the heating element based on said temperature gradient and said temperature difference when the temperature of the soleplate is between the first predetermined temperature and a third predetermined temperature that is higher than the first predetermined temperature.
- If said temperature gradient is positive, the controller is arranged to control the heating power of the heating element so that the heating power is off.
- If said temperature gradient is negative, the controller may be arranged to control the heating power of the heating element so that the heating power increases for decreasing values of the temperature of the soleplate from the third predetermined temperature to the first predetermined temperature, wherein this increase in heating power is larger for larger negative temperature gradients.
- In some embodiments, the controller is arranged to control the heating element so that the heating power is off if the temperature of the soleplate is above the third predetermined temperature.
- In some embodiments, the range of temperatures between the second predetermined temperature and the third predetermined temperature forms a band for controlling the heating element based on the temperature gradient and the temperature difference between a temperature of the soleplate and the first predetermined temperature T1. Below the band (i.e. below the second predetermined temperature), the heating element may be a full power (or some other appropriate power). Above the band (i.e. above the third predetermined temperature T3), the heating element may be off.
- In some embodiments, ironing appliance further comprises a memory to store a look up table containing values of heating powers at different combinations of temperature differences between the sole plate and the first predetermined temperate and the temperature gradient of the sole plate, the controller being arranged to use said values in the look up table to control the heating power of the heating element.
- According to another aspect of the invention, there is provided a method of controlling an ironing appliance comprising a soleplate and a heating element for heating the soleplate, the method comprising: determining a temperature gradient of the soleplate and a temperature difference between a temperature of the soleplate and a first predetermined temperature; and controlling the heating power of the heating element based on said temperature gradient and said temperature difference.
- These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
- Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
-
Figure 1 is a schematic illustration of anironing apparatus 1 according to an embodiment of the invention; -
Figure 2 is an illustration of anironing apparatus 1 according to an embodiment of the invention; -
Figure 3 is graph showing the variation of the temperature of a soleplate along the time; and -
Figure 4 is a flow chart according to an embodiment of the invention. -
Figure 1 shows a schematic illustration of anironing apparatus 1 according to an embodiment of the invention. The ironing apparatus includes asoleplate 10, aheating element 20 for heating thesoleplate 10, acontroller 30 for controlling the heating power of theheating element 10, and atemperature sensor 40 for determining the temperature of thesoleplate 10. - The
heating element 20 in this embodiment is for example an electric heating element and thesoleplate 10 is heated by theheating element 20. The temperature of thesoleplate 10 is measured by thetemperature sensor 40. Embodiments of the invention could use any suitable temperature sensor that is thermally coupled to thesoleplate 40. For example, a positive temperature coefficient (PTC) resistor, a negative temperature coefficient (NTC) resistor, and a thermocouple element could be used. - The heating power of the
heating element 20 is controlled by thecontroller 30. - In this embodiment, the
heating element 20 is controlled by thecontroller 30 to be turned on or off, with different duty cycles of the on/off time being used to deliver different heating powers. In this embodiment, a triac (not shown) is for example used to deliver intended power to theheating element 20, though in other embodiments other suitable components (e.g. a solid state switch) could be used. In this embodiment, the triac is controlled by the controller 30 (e.g. including a logic device or MCU) to vary the duty cycle of its conduction on/off time. - In other embodiments, the power control can be done by "chopping" the AC waveform. This may, in some embodiments, give better resolution to the power but may result in EMC harmonics noise. The later takes more time to complete one full cycle of power.
- Hence, in some embodiments, the
controller 30 is arranged to control the heating power of theheating element 20 by varying the time duration theheating element 20 is turned on in a given time period (e.g. with a constant electrical power supplied to the heating element 20). In other embodiments, thecontroller 30 is arranged to control the heating power of theheating element 20 by varying the electrical power supplied to theheating element 20. - The desired temperature of the soleplate during ironing can be set by the user by means of a temperature selector or temperature control dial (not shown in
Figure 1 ), but alternatively any other known control means such as push-buttons or touch controls can be used. - In use, the
controller 30 compares the instantaneous temperature of thesoleplate 10 with the desired temperature and controls the heat production of theheating element 20. As will be discussed in more detail below, thecontroller 30 is adapted to control the heating power of theheating element 20 based the temperature gradient of thesoleplate 10 and the temperature different between thesoleplate 10 and the desired temperature. - In the following, the "temperature gradient of the soleplate" refers to the rate of change over time of the temperature of the soleplate. In a more mathematical phrasing the temperature gradient of the sole plate can be understood as the first derivative of the soleplate temperature as a function of time. It will be appreciated that the temperature gradient of the soleplate can be positive (for a rising temperature of the soleplate) or negative (for a falling temperature of the soleplate).
- The gradient is measured at temperature sensing point on the
soleplate 10 where the sensor 40 (e.g. a thermistor) is mounted on thesoleplate 10 so as to sense actual temperature and control the heat input. - In this embodiment, the
controller 30 periodically determines the temperature of thesoleplate 10 via thesensor 40. From this periodic measurement, thecontroller 30 can determine the temperature gap at a certain time and the temperature gradient at that time. For example, thecontroller 30 may determine the temperature of thesoleplate 10 every 20 ms, though embodiments are not limited thereto. - In this embodiment, the
controller 30 for example comprises a memory (not shown) to store a look up table containing values of heating powers at different combinations of temperature differences between thesoleplate 10 and the desired temperature and the temperature gradient of thesole plate 10. In such embodiments, thecontroller 30 is arranged to use values in the look up table to control the heating power of theheating element 20. -
Figure 2 shows schematically shows locations of thesoleplate 10, theheating element 20, thecontroller 30, and thesensor 40 in anironing appliance 1 according to the first embodiment. Theheating element 20 and thesensor 40 are within the body of thesoleplate 10. However, it will be appreciated that embodiments of the invention could be used with any ironing appliance design, and the locations of the various components inFigure 2 should not be construed as limiting. For example, thecontroller 30 could be located in any suitable location in theironing appliance 1. - The
ironing apparatus 1 ofFigure 2 comprises thesoleplate 10 which is heated by theelectric heating element 20. The instantaneous temperature of thesoleplate 10 is measured by means of thetemperature sensor 40, for example a PTC resistor, an NTC resistor or a thermocouple element, which is thermally coupled to thesoleplate 10. The desired soleplate temperature can be set by the user by means of a temperature selector ortemperature control dial 8, but alternatively any other known control means such as push-buttons or touch controls can be used. Thecontroller 30 compares the instantaneous temperature of thesoleplate 10 with the desired temperature and controls the heat production of theheating element 20, for example by means of a triac in series with theheating element 20, in such a manner that the instantaneous temperature becomes equal to the desired temperature. Instead of the shown control using atemperature sensor 40 and a triac it is possible to use other methods such as using a thermostat to control the temperature of thesoleplate 10. - The
ironing apparatus 1 of this embodiment further comprises asteam generator 12 having awater reservoir 14, awater pump 16 and asteam chamber 18 which is heated by thesoleplate 10. Thewater pump 16 pumps water from thewater reservoir 14 to thesteam chamber 18 via atube 21. The water evaporates in thesteam chamber 18 and escapes viasteam ports 22 formed in thesoleplate 10. The supply of steam is controlled by means of an activation signal AS supplied by thecontroller 30 in response to a control signal from a control knob orcontrol dial 26 by means of which the amount of steam to be produced can be set. - The
ironing apparatus 1 of this embodiment further comprises anhand sensor 24 arranged in the handle of the steam iron. The hand sensor can be of any known type, for example a capacitive sensor. Thehand sensor 24 informs thecontroller 30 whether or not the steam iron is in use. - It will, however, be appreciated that the above description of
Figure 2 is merely for illustrative purposes, and that embodiments of the invention could be applied to any type of ironing apparatus with asoleplate 10,heating element 20,temperature sensor 40 and acontroller 30. - As discussed, in conventional arrangements, the soleplate of an ironing appliance would be heated until the desired temperature is reached, at which point the heating element would be switched off, leading to problems of temperature overshoot and undershoot as discussed above.
-
Figure 3 shows a graph of temperature against time during the heating of thesoleplate 10. In this graph, it is assumed that the desired (e.g. via user control) temperature of thesoleplate 10 is a first predetermined temperature T1. -
Figure 4 shows a flow chart according to an embodiment of the invention. At step S1, the temperature gradient of thesoleplate 10 and at step S20, the temperature difference between the temperature of thesoleplate 10 and the first predetermined temperature T1 is determined. Steps S10 and S20 may be done in either order, or simultaneously. A step S30 the heating power of theheating element 20 is controlled based on the temperature gradient and the temperature difference. - The control logic of the
controller 30 of this embodiment aims reduce the temperature overshoot by varying the heating power of theheating element 20 with respect to the temperature gradient of thesoleplate 10 and the temperature difference between the temperature of thesoleplate 10 and the first predetermined temperature T1. - In the following description the temperature difference between the temperature of the
soleplate 10 and the first predetermined temperature T1 will be referred to as a "temperature gap", that is either positive of negative depending on whether the temperature of thesoleplate 10 is below the first predetermined temperature T1 (negative temperature gap) or whether the temperature of thesoleplate 10 is above the first predetermined temperature T1 (positive temperature gap). - In this embodiment, the
controller 30 controls the heating power of theheating element 20 based on the temperature gradient and the temperature gap when the temperature of the soleplate is between a second predetermined temperature T2 that is lower than the first predetermined temperature T1 and a third predetermined temperature T3 that is higher than the first predetermined temperature T1. As shown inFigure 3 , in this embodiment, the first predetermined temperature T1 is midway between the second and third predetermined temperatures T2, T3, but embodiments of the invention are not limited in this way. - In this embodiment, when the temperature of the
soleplate 10 is less than the second predetermined temperature T2, thecontroller 30 is arranged to control theheating element 20 to use maximum heating power. Hence, below the second predetermined temperature T2, the heating element uses maximum heating power to heat thesoleplate 10 as quickly as possible. However, in other embodiments, it may be desired to use a different heating power, for example if the user set first predetermined temperature T1 is a low setting. - In this embodiment, the
controller 30 is arranged to control the heating power of theheating element 20 based on the temperature gradient and the temperature gap when the temperature of thesoleplate 10 is between the second predetermined temperature T2 and the third predetermined temperature T3. In other words, the second predetermined temperature T2 and the third predetermined temperature T3 define a temperature window for the heating power of theheating element 20 to be based on the temperature gradient and the temperature gap. - In this embodiment, the second predetermined temperature T2 is 10°C less than the first predetermined temperature T1, and the third predetermined temperature T3 is 10°C greater than the first predetermined temperature T1. In some embodiments, the differences between the second predetermined temperature T2 and the first predetermined temperature T1 and between the first predetermined temperature T1 and the third predetermined temperature T3 may be varied depending on the temperature setting of the ironing appliance. For example, a smaller set of differences may be selected if the user set first predetermined temperature T1 to have a low setting.
- In other embodiments, a different gap between the second predetermined temperature T2 and the first predetermined temperature T1 may be used when compared to the gap between the first predetermined temperature and the third predetermined temperature T3. For example, the absolute value of the temperature gap between the third predetermined temperature T3 and the first predetermined temperature T1 could be less than the absolute value of the temperature gap between the second predetermined temperature T2 and the first predetermined temperature T1.
-
Figure 3 will be explained in more detail with reference to Table 1. In Table 1, there can be considered to be four zones of operation. Zone A is characterised by a negative temperature gap and a negative temperature gradient. Zone B is characterised by a negative temperature gap and a positive temperature gradient. Zone C is characterised by a positive temperature gap and a positive temperature gradient. Zone D is characterised by a positive temperature gap and a negative temperature gradient. - In Zone A, the
controller 30 is arranged to control the heating power of theheating element 20 so that the heating power decreases for increasing values of the temperature of thesoleplate 10 from the second predetermined temperature T2 to the first predetermined temperature T1, with this decrease in heating power being larger for smaller negative temperature gradients. - In Zone B, the
controller 30 is arranged to control the heating power of theheating element 20 so that the heating power decreases for increasing values of the temperature of thesoleplate 10 from the second predetermined temperature T2 to the first predetermined temperature T1, with this decrease in heating power being larger for larger positive temperature gradients. - In Zone C, the
controller 30 is arranged to control the heating power of theheating element 20 so that the heating power is off so the temperature gradient of thesoleplate 10 decreases until Zone C ends. - In Zone D, the
controller 30 is arranged to control the heating power of theheating element 20 so that the heating power increases for decreasing values of the temperature of thesoleplate 10 from the third predetermined temperature T3 to the first predetermined temperature T1, with this increase in heating power being larger for larger negative temperature gradients. - Table 1 shows different heating powers (as %s, with the maximum heating power being 100%) applied to the
soleplate 10 at different temperature gaps and temperature gradients. As discussed, in this embodiment, thecontroller 30 comprises a memory (not shown) to store a look up table containing values of heating powers at different combinations of temperature differences between thesoleplate 10 and the desiredtemperature 10 and the temperature gradient of thesole plate 10. The values of Table 1 could form the basis for such a look up table. - In
Figure 3 , points p1 to p10 are shown, with these labels shown at appropriate boxes in Table 1. Points p1 to p10 represent different points in time as thesoleplate 10 during operation. The arrows associated with points p1 to p10 inFigure 3 represent relative heating powers.Table 1 : Negative Temperature Gap Positive Temperature Gap <-10°C -10°C to -5°C -5°C to 0°C 0°C 0°C to +5°C +5°C to +10°C >+10°C Negative Temperature Gradient < -2°C/sec 100% 90% 70% 50% 30% 0% -2°C/sec 100% 70% 50% (p5) 30% (p4) 10% 0% -1°C/sec 100% 50% (p6) 30% (p9) 10% (p8) (p10) 0% 0% 0°C/sec Positive Temperature Gradient +1°C/sec 100% (p1) 70% 50% 0% 0% 0% +2°C/sec 100% 50% (p2) 30% (p7) 0% 0% 0% > +2°C/sec 100% 30% 10% (p3) 0% 0% 0% - In this embodiment, temperatures more than 10°C under the first predetermined temperature T1 (i.e. a negative temperature gap of <-10°C) or more than 10°C over the first predetermined temperature T1 (i.e. a positive temperature gap of >+10°C) fall outside of the range of the second predetermined temperature T2 to the third predetermined temperature T3. In this embodiment, for temperatures lower than the second predetermined temperature T2 (i.e. a negative temperature gap of <-10°C), full heating power (i.e. 100%) is used regardless of the temperature gradient. Similarly, in this embodiment, for temperatures greater than the third predetermined temperature T5 (i.e. a positive temperature gap of >+10°C), zero heating power (i.e. 0%) is used regardless of the temperature gradient.
- Points p1 to p10 represent an example of temperature gaps and temperature gradients during the operation of an ironing appliance according to an embodiment of the invention. At each point p1 to p10, the
controller 30 will determine the temperature gradient of thesoleplate 10 and the temperature gap using thesensor 40. - At point p1 (region of +1°C/sec positive temperature gradient and a negative temperature gap of more than -10°C), the temperature of the
soleplate 10 is lower than the second predetermined temperature T2 and the temperature of thesoleplate 10 is relatively slowly rising. - At point p1 in this embodiment, the
controller 30 controls theheating element 20 to heat thesoleplate 10 at 100% heating power. This is because, in this embodiment, at point p1, the temperature of the soleplate is outside the operating window of control based on the temperature gradient and temperature gap. It will be appreciated, however, that in some embodiments, thecontroller 30 may control theheating element 20 based on the temperature gradient and temperature gap for all detected temperatures of thesoleplate 10. - At point p2 (region of +2°C/sec positive temperature gradient and a negative temperature gap of between -10°C and -5°C) and at point p3 (region of greater than +2°C/sec positive temperature gradient and a negative temperature gap of between -5°C and -0°C), the temperature of the
soleplate 10 is above the second predetermined temperature T2 but lower than the second predetermined temperature T2. - From p1 to p3, the temperature of the
soleplate 10 is increasing, and so thecontroller 30 reduces the power of theheating element 20 so as to slow the heating of thesoleplate 10 as the temperature of thesoleplate 10 approaches the first predetermined temperature T1 with a positive temperature gradient. This slowing of the heating of thesoleplate 10 as thesoleplate 10 rises towards the first predetermined temperature T1 helps to minimise temperature overshoot. - As shown in
Figure 3 , following p3, the temperature of thesoleplate 10 will overshoot the first predetermined temperature T1, with the amount of overshoot being smaller than it would have been if the heating power had been 100% until the first predetermined temperature T1 was reached. This smaller overshoot is because of the reduction in the heating power of theheating element 20 as the temperature of thesoleplate 10 approached the first predetermined temperature T1. - The temperature of the
soleplate 10 will then peak and then fall. At point p4 (region of -2°C/sec negative temperature gradient and a positive temperature gap of between 0°C and +5°C) the temperature of thesoleplate 10 is falling and a small (30%) heating power is provided so as to attempt to minimise the undershoot of the first predetermined temperature T1. - At point p5 (region of -2°C/sec negative temperature gradient and a negative temperature gap of between 0°C and -5°C) the temperature of the
soleplate 10 is still falling and a 50% heating power is provided so as to raise thesoleplate 10 back towards the first predetermined temperature T1. At point p6 (region of -1°C/sec negative temperature gradient and a negative temperature gap of between -5°C and -10°C), the 50% heating power is maintained. - Hence, following p4, the temperature of the
soleplate 10 will undershoot the first predetermined temperature T1 (points p5 and p6), with the undershoot amount being smaller than it would have been if no heating power had been used as the temperature of thesoleplate 10 approached the first predetermined temperature T1 with a negative temperature gradient. It will be appreciated that at points p5 and p6, the control method is providing an under-damped response. - The temperature of the
soleplate 10 will then reach maximum undershoot and start rising again. At point p7 (region of +2°C/sec positive temperature gradient and a negative temperature gap of between 0°C and -5°C), the temperature of thesoleplate 10 is rising, and so the heating power is lowered (as compared to point p6) to 30%. - By point p8 (region of -1°C/sec negative temperature gradient and a positive temperature gap of between 0°C and 5°C), the temperature of the
soleplate 10 has passed the first predetermined temperature T1, peaked again, and is now falling again. Hence, a small 10% heating power is used so as to minimum undershoot. - At point p9 (region of -1°C/sec negative temperature gradient and a negative temperature gap of between 0°C and -5°C) the temperature of the
soleplate 10 is falling below the first predetermined temperature T1, and therefore a 30% heating power (i.e. larger than that at point p8) is used. - Point p10 is in the same region of Table 1 as point p8 (i.e. 1°C/sec negative temperature gradient and a positive temperature gap of between 0°C and 5°C). The
controller 30 will continue to regulate the heating of thesoleplate 10 in this way. - Although this embodiment has been discussed in the context of a look up table in the form of Table 1, it will be appreciated that other embodiments could use other ways of storing the relationship between the temperature gradient and the temperature gap. Furthermore, in embodiments that use a look up table, the values in the look up table may be scaled in some embodiments depending on the first predetermined temperature T1 (i.e. the set temperature) or other factors.
- As discussed, in embodiments of the invention, there is provided an ironing appliance comprising a
soleplate 10, aheating element 20 for heating thesoleplate 20, acontroller 30 for controlling the heating power of theheating element 20, and atemperature sensor 40. Thecontroller 30 determines a temperature gradient of thesoleplate 10 and a temperature difference between a temperature of thesoleplate 10 and a first predetermined temperature T1, and thecontroller 30 is adapted to control the heating power of the heating element (20) based on said temperature gradient and said temperature difference. - By determining a temperature gradient of the
soleplate 10 and a temperature difference between a temperature of thesoleplate 10 and the first predetermined temperature, and by controlling the heating power of theheating element 20 based on the temperature gradient and the temperature difference, thesoleplate 10 can be heated in a way that minimises overshoot and undershoot. - In some embodiments, the range of temperatures between the second predetermined temperature T2 and the third predetermined temperature T3 forms a band for controlling the
heating element 20 based on the temperature gradient and the temperature difference between a temperature of thesoleplate 10 and the first predetermined temperature T1. Below the band (i.e. below the second predetermined temperature T2), theheating element 20 may be a full power (or some other appropriate power). Above the band (i.e. above the third predetermined temperature T3), theheating element 20 may be off. - As a result, the inputs of the control method of embodiments of the present invention as the temperature gradient and the gap between the actual temperature and the set point (i.e. first predetermined temperature T1). The control method of the present invention aims to reduce the temperature range within which the soleplate fluctuates around the set point (i.e. first predetermined temperature T1). The control method of some embodiments reduces the temperature gradient when the temperature gap is small. Some embodiments can provide an under-damped or a critically damped temperature response.
- It will be appreciated that there are several external factors that may affect the temperature of the sole plate, such as whether the ironing apparatus is in contact with clothes, whether a steam function of the ironing apparatus is on, whether the ironing apparatus is resting on its heal or resting horizontally on an ironing board. The present invention can take these factors into account by controlling the heating element based on the temperature gap and the temperature gradient.
- The above embodiments as described are only illustrative, and not intended to limit the technique approaches of the present invention. Although the present invention is described in details referring to the preferable embodiments, those skilled in the art will understand that the technique approaches of the present invention can be modified or equally displaced without departing from the scope of the invention as claimed. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. Any reference signs in the claims should not be construed as limiting the scope.
Claims (9)
- An ironing appliance comprising:a soleplate (10);a heating element (20) for heating the soleplate (20);a temperature sensor (40) for sensing a temperature of the soleplate (10);a controller (30) adapted to:a) determine a temperature gradient of the soleplate (10) as a rate of change of the temperature of the soleplate over time, and a temperature difference between said temperature of the soleplate (10) and a first predetermined temperature (Tl),b) control the heating power of the heating element (20) based on said temperature gradient and said temperature difference,characterized in that the controller (30) is arranged to:control the heating element (20) to use a first heating power when temperature of the soleplate (10) is less than a second predetermined temperature (T2) that is lower than the first predetermined temperature (T1);control the heating power of the heating element (20) based on said temperature gradient and said temperature difference when the temperature of the soleplate (10) is between the second predetermined temperature (T2) and the first predetermined temperature (T1) wherein:if said temperature gradient is positive, control the heating power of the heating element (20) so that the heating power decreases for increasing values of the temperature of the soleplate (10) between the second predetermined temperature (T2) and the first predetermined temperature (Tl), wherein this decrease in heating power is larger for larger positive temperature gradients; andif said temperature gradient is negative, control the heating power of the heating element (20) so that the heating power decreases for increasing values of the temperature of the soleplate (10) between the second predetermined temperature (T2) and the first predetermined temperature (Tl), wherein this decrease in heating power is larger for smaller negative temperature gradients.
- An ironing appliance as claimed claim 1, wherein the controller is arranged to:
control the heating power of the heating element (20) based on said temperature gradient and said temperature difference when the temperature of the soleplate (10) is between the first predetermined temperature (T1) and a third predetermined temperature (T3) that is higher than the first predetermined temperature (T1), wherein:if said temperature gradient is positive, control the heating power of the heating element (20) so that the heating power is off; andif said temperature gradient is negative, control the heating power of the heating element (20) so that the heating power increases for decreasing values of the temperature of the soleplate (10) between the third predetermined temperature (T3) and the first predetermined temperature (Tl), wherein this increase in heating power is larger for larger negative temperature gradients. - An ironing appliance according to claim 1 or 2, wherein the controller (30) is arranged to control the heating power of the heating element (20) by varying the time duration the heating element (20) is turned on in a given time period with a constant electrical power supplied to the heating element (20).
- An ironing appliance according to claim 1 or 2, wherein the controller (30) is arranged to control the heating power of the heating element (20) by varying the electrical power supplied to the heating element (20).
- An ironing appliance according to any one of claims 1 to 4, wherein the first heating power is a maximum heating power.
- An ironing appliance according to any one of claims 1 to 5, wherein the controller (30) is arranged to control the heating element (20) so that the heating power is off if the temperature of the soleplate (10) is above the third predetermined temperature (T3).
- An ironing appliance according to any one of claims 1 to 6, further comprising a memory to store a look up table containing values of heating powers at different combinations of temperature differences between the sole plate (10) and the first predetermined temperate and the temperature gradient of the sole plate (10), the controller (30) being arranged to use said values in the look up table to control the heating power of the heating element (20).
- A method of controlling an ironing appliance comprising a soleplate (10) and a heating element (20) for heating the soleplate (20), the method comprising the steps of:determining (S10) a temperature gradient of the soleplate (10) as a rate of change of the temperature of the soleplate over time and determining (S20) a temperature difference between the temperature of the soleplate (10) and a first predetermined temperature (T1); andcontrolling (S30) the heating power of the heating element (20) based on said temperature gradient and said temperature difference,characterized in that the controlling the heating power of the heating element (20) comprises:using a first heating power when temperature of the soleplate (10) is less than a second predetermined temperature (T2) that is lower than the first predetermined temperature (T1);controlling the heating power of the heating element (20) based on said temperature gradient and said temperature difference when the temperature of the soleplate (10) is between the second predetermined temperature (T2) and the first predetermined temperature (T1); and then:if said temperature gradient is positive, controlling the heating power of the heating element (20) so that the heating power decreases for increasing values of the temperature of the soleplate (10) between the second predetermined temperature (T2) and the first predetermined temperature (T1), wherein this decrease in heating power is larger for larger positive temperature gradients; andif said temperature gradient is negative, control the heating power of the heating element (20) so that the heating power decreases for increasing values of the temperature of the soleplate (10) between the second predetermined temperature (T2) and the first predetermined temperature (Tl), wherein this decrease in heating power is larger for smaller negative temperature gradients.
- A method as claimed in claim 8, comprising:
controlling the heating power of the heating element (20) based on said temperature gradient and said temperature difference when the temperature of the soleplate (10) is between the first predetermined temperature (T1) and a third predetermined temperature (T3) that is higher than the first predetermined temperature (T1), wherein:if said temperature gradient is positive, control the heating power of the heating element (20) so that the heating power is off; andif said temperature gradient is negative, control the heating power of the heating element (20) so that the heating power increases for decreasing values of the temperature of the soleplate (10) between the third predetermined temperature (T3) and the first predetermined temperature (Tl), wherein this increase in heating power is larger for larger negative temperature gradients.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP15161630 | 2015-03-30 | ||
PCT/EP2016/056492 WO2016156179A1 (en) | 2015-03-30 | 2016-03-24 | An ironing appliance with means for controlling the heating power |
Publications (2)
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EP3277879A1 EP3277879A1 (en) | 2018-02-07 |
EP3277879B1 true EP3277879B1 (en) | 2019-07-24 |
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Application Number | Title | Priority Date | Filing Date |
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EP16711647.4A Active EP3277879B1 (en) | 2015-03-30 | 2016-03-24 | An ironing appliance with means for controlling the heating power |
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US (1) | US20180051410A1 (en) |
EP (1) | EP3277879B1 (en) |
JP (1) | JP2018509999A (en) |
CN (1) | CN107429474B (en) |
BR (1) | BR112017020730A2 (en) |
RU (1) | RU2017134675A (en) |
WO (1) | WO2016156179A1 (en) |
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PL3409828T3 (en) * | 2017-05-31 | 2021-11-29 | Sda Factory Vitoria Slu | Heating control with reduced temperature overshoots for an iron and corresponding method |
CN113152050B (en) * | 2020-01-22 | 2023-05-12 | 佛山市顺德区美的电热电器制造有限公司 | Steam generating device, control method, laundry treating device, and storage medium |
CN111781972B (en) * | 2020-06-24 | 2022-01-04 | 惠州拓邦电气技术有限公司 | Foot basin, and temperature control method and device of foot basin |
CN115202413A (en) * | 2022-08-31 | 2022-10-18 | 月立集团有限公司 | Temperature control method and device for dry ironing equipment |
Family Cites Families (7)
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DE3703671C2 (en) * | 1987-02-06 | 1995-01-05 | Bosch Siemens Hausgeraete | Method for determining the duration of an ongoing drying process in a tumble dryer |
JP2966505B2 (en) * | 1990-10-31 | 1999-10-25 | 三洋電機株式会社 | Iron temperature control device |
JPH0576700A (en) * | 1991-09-18 | 1993-03-30 | Sanyo Electric Co Ltd | Steam iron |
JPH09510904A (en) * | 1995-01-23 | 1997-11-04 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | Steam iron with dough temperature sensor to control steam generation |
JP2001507271A (en) * | 1997-10-29 | 2001-06-05 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Steam iron predicts power control |
CN100458631C (en) * | 2005-03-25 | 2009-02-04 | 深圳斯贝克动力电子有限公司 | Method and apparatus for controlling temperature of heating element |
CN204023265U (en) * | 2014-08-15 | 2014-12-17 | 宁波市炅驰电器有限公司 | A kind of Novel steam electric iron |
-
2016
- 2016-03-24 RU RU2017134675A patent/RU2017134675A/en not_active Application Discontinuation
- 2016-03-24 US US15/557,526 patent/US20180051410A1/en not_active Abandoned
- 2016-03-24 EP EP16711647.4A patent/EP3277879B1/en active Active
- 2016-03-24 BR BR112017020730A patent/BR112017020730A2/en not_active Application Discontinuation
- 2016-03-24 WO PCT/EP2016/056492 patent/WO2016156179A1/en active Application Filing
- 2016-03-24 JP JP2017550667A patent/JP2018509999A/en not_active Withdrawn
- 2016-03-24 CN CN201680020270.6A patent/CN107429474B/en active Active
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RU2017134675A3 (en) | 2019-05-24 |
CN107429474B (en) | 2020-09-18 |
EP3277879A1 (en) | 2018-02-07 |
CN107429474A (en) | 2017-12-01 |
BR112017020730A2 (en) | 2018-06-26 |
JP2018509999A (en) | 2018-04-12 |
WO2016156179A1 (en) | 2016-10-06 |
RU2017134675A (en) | 2019-04-04 |
US20180051410A1 (en) | 2018-02-22 |
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