JP2005198866A - Apparatus controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus controller which detects weight accurately independent of an atmospheric temperature. <P>SOLUTION: A temperature detection means 40 for detecting the temperature of an object 32 to be heated adds its detection output to the detection output of a weight detection means 43 and corrects the temperature characteristic of detected weight. Thus, even when the atmospheric temperature of the weight detection means 43 changes and a detected weight value drifts, the temperature characteristic of the detected weight can be corrected and hence the weight is detected accurately independent of the atmospheric temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a device control apparatus having a weight detection means.

Conventionally, in this type of equipment, for example, a rice cooker or the like, it is known that the amount of rice is detected by weight detection means and the control means controls the heating output according to the amount of rice cooking and the rice cooking sequence to cook rice. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 5-261018

  However, in the conventional configuration, when cooking (rice cooking) is started, the ambient temperature of the weight detection means rises and the detected weight value drifts (varies) due to the influence of the ambient temperature, so accurate weight detection cannot be performed. It had the problem that.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a device control apparatus that can accurately detect a weight regardless of the ambient temperature.

  In order to solve the above-described conventional problems, the apparatus for controlling an apparatus according to the present invention is configured such that the temperature detection unit that detects the temperature of the object to be heated adds the detection output to the detection output of the weight detection unit. The temperature characteristic is corrected.

  Thus, even if the ambient temperature of the weight detection means fluctuates and the detected weight value drifts, it is possible to accurately detect the weight regardless of the ambient temperature in order to correct the temperature characteristics of the detected weight.

  The apparatus control apparatus of the present invention can accurately detect the weight regardless of the ambient temperature.

  The first invention is a heating means for heating an object to be heated, a temperature detecting means for detecting the temperature of the object to be heated, a weight detecting means for detecting the weight of the object to be heated, and a detection by the temperature detecting means. Control means for controlling the heating output of the heating means in accordance with the temperature and the detected weight of the weight detecting means and the control sequence, and the temperature detecting means adds the detected output to the detected output of the weight detecting means. Therefore, even if the ambient temperature of the weight detection unit fluctuates and the detected weight value drifts, the temperature characteristic of the detected weight can be corrected. Therefore, accurate weight detection can be performed regardless of the ambient temperature.

  According to a second aspect of the present invention, there is provided a heating means for heating an object to be heated, a temperature detecting means for detecting the temperature of the object to be heated, a weight detecting means for detecting the weight of the object to be heated, and a control sequence for storing a control sequence. 1 storage means, a control means for controlling the heating output of the heating means in accordance with a detection temperature of the temperature detection means, a detection weight of the weight detection means and a control sequence, and an inclination of an output temperature characteristic of the weight detection means And a second storage means for storing table data indicating the relationship between the ambient temperature and a correction calculation means for performing a temperature correction calculation of the weight value detected by the weight detection means, the correction calculation means comprising the temperature detection means By detecting the inclination of the output temperature characteristic from the second storage means based on the output value of the detected temperature of the device, and making a device for controlling the temperature of the detected weight value, a weight detection device is obtained. Even if the ambient temperature fluctuates and the detected weight value drifts, the weight of the output weight characteristic is accurately read regardless of the ambient temperature in order to perform the temperature correction calculation of the detected weight value by reading the slope of the output temperature characteristic from the second storage means. Can be detected.

  In particular, according to a third aspect of the present invention, in the first or second aspect of the present invention, the apparatus includes a blowing unit that cools the heating unit, and uniforms the atmospheric temperature inside the device with the blowing unit to detect the weight of the object to be heated. As a result, a more accurate weight detection value can be obtained.

  According to a fourth aspect of the present invention, there is provided a heating means for heating an object to be heated, a temperature detecting means for detecting the temperature of the object to be heated, a weight detecting means for detecting the weight of the object to be heated, and a detection by the temperature detecting means. Control means for controlling the heating output of the heating means in accordance with the temperature and the detected weight of the weight detecting means and a control sequence; and a pulse voltage applying means for applying a drive voltage to the weight detecting means, the temperature detecting means The detection output is added to the detection output of the weight detection means to correct the temperature characteristic of the detected weight, and the pulse voltage application means supplies the pulse voltage to the weight detection means, and the weight detection means By reducing the self-heating of the weight detection elements constituting the, the adverse effects due to self-heating can be eliminated, and a more accurate weight detection value can be obtained.

  According to a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, when the detected temperature of the temperature detecting unit exceeds a preset upper limit temperature of the weight detecting unit, a weight detection error display is displayed. By performing the above, a warning can be given to the user so that weight detection with a large error is not performed.

  According to a sixth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, when the detected temperature of the temperature detecting means is lower than the preset lower limit temperature of the weight detecting means, a weight detection error is detected. By performing the display, a warning can be given to the user so that weight detection with a large error is not performed.

  In a seventh aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, when the temperature detected by the temperature detecting means is a temperature range close to a preset upper limit temperature of the weight detecting means, the weight By stopping detection, it is possible to prevent the control sequence from being executed based on erroneous weight detection.

  In the eighth invention, in particular, in any one of the first to fourth inventions, when the detected temperature of the temperature detecting means is a temperature range close to a preset lower limit use temperature of the weight detecting means, the weight By stopping detection, it is possible to prevent the control sequence from being executed based on erroneous weight detection.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 to 6 show a device control apparatus according to Embodiment 1 of the present invention.

  FIG. 1 shows an example of a kitchen-compatible electromagnetic cooker as an apparatus. A heating means 34 including a heating object 32 (such as a pot containing cooking food) placed on a top plate 33 and a heating coil. Inductive heating is performed by supplying a high-frequency current from an inverter 36 including a switching element 35 and the like. A voltage obtained by rectifying the AC voltage of the commercial power supply 37 with a rectifier bridge 38 and a capacitor 39 is applied to the inverter 36. The temperature detection means 40 detects the temperature of the bottom surface of the article 32 to be heated, and the control means 41 comprising a microcomputer or the like controls the induction heating output of the inverter 36 with the set power and temperature. The user uses the operation display means 42 to select one menu from the setting of the heating power and the heating time, or from a plurality of stored cooking menus, and gives an instruction to the control means 41. The weight of the object to be heated 32 is detected by the weight detection unit 43 and input to the calculation unit 44 that calculates the temperature and weight. The weight detection by the weight detection means 43 is sufficient if the weight of the cooked food itself can be detected. However, as shown in this embodiment, the weight of the cooked food + pan may be detected. It may be the weight detection of the device body including the object + the pan.

  Further, as shown in FIG. 2, the entire cooking device has a configuration in which an operation display means 42, a power switch 45, and a power lamp 46 are arranged on the front surface of the device body case 31 to improve operability. Further, an air blowing means 47 is provided in the equipment body case 31 in order to detect the weight of the article to be heated 32 after the inverter 36 and the heating means 34 are cooled and the ambient temperature inside the equipment is made uniform. A heating region 49 indicated by a pattern is formed on the top board 33.

  In FIG. 3, the weight detection means 43 includes integrated (network) resistors 51 b and 52 and a weight detection element 53, and outputs a voltage Vout corresponding to the weight of the object to be heated 32. A voltage Vcc is supplied from a DC power source (not shown) to the weight detection means 43, the control means 41, the operation display means 42, the calculation means 44, and the like. A value VTH obtained by dividing the voltage Vcc by the temperature detecting element 40a and the integrated resistors 54a and 54b constituting the temperature detecting means 40 is input to the calculating means 44 as temperature information of the bottom surface of the object to be heated 32, and the integrated resistance 55 , 56 are further divided and input to the voltage follower 57. The output of the voltage follower 57 is connected to the integrated resistor 52 via the integrated resistor 51a, thereby converting the resistance change due to the temperature of the temperature detecting element 40a into a minute voltage change. The compensation voltage is added to the output voltage Vout of the weight detection means 43.

  The characteristics of the temperature detection element 40a and the values of the integrated resistors 51a to 56 are selected so that this minute voltage has a slope opposite to the temperature change amount of the output of the weight detection means 43 and has substantially the same value. For example, when the temperature characteristic (heat output) of the weight detection means 43 is about 200 ppm / ° C., if the resistance value of the temperature detection element 40 a is 34 kΩ at 20 ° C. and 1.2 kΩ at 150 ° C., it corresponds to −200 ppm / ° C. In order to obtain the temperature compensation voltage, the integrated resistors 51a and 51b have a value of 10 kΩ (the load-resistance characteristic of the weight detecting element 53 in FIG. 4), the integrated resistor 52 has a value of 1 kΩ, and the integrated resistors 54a and 54b have a value of 3. The value of 3 kΩ, the integrated resistor 55 is 2 kΩ, and the value of the integrated resistor 56 is 7.5 kΩ.

  About the control apparatus of the apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the user puts a cooked product in a heated object (pot) 32 that can be induction-heated, and places it in a heating area 49 on the top plate 33. The power switch 45 is turned on, and a predetermined temperature and power (thermal power) are set with the switch on the operation display means 42. The control means 41 controls the inverter 36 and supplies a high frequency current to the heating means 34. An induction magnetic field is emitted from the heating means 34, and the object to be heated 32 on the top plate 33 is induction heated. Due to this induction heating, the temperature of the article to be heated 32 rises, and the cooked food inside is cooked. The temperature detection means 40 detects the bottom surface temperature of the object to be heated 32 through the top plate 33, and the arithmetic means 44 calculates the object to be heated 32 from the value VTH divided by the temperature detection element 40a and the integrated resistors 54a and 54b by a linear approximation formula. Calculate the bottom temperature of.

  On the other hand, the weight of the object to be heated 32 containing the cooked food is detected by a weight detection element 53 attached to the heating area of the top plate 33. The weight detection element 53 is obtained by mixing a predetermined amount of conductive particles in rubber or plastic, which is an insulating material, so that the conductivity changes depending on the dispersion state of the conductive particles, that is, the change in load. The resistance value gradually decreases as the load increases. Both surfaces of the weight detection element 53 are sandwiched between thin electrodes made of non-magnetic metal (however, the surface of the upper electrode is covered with an insulator to prevent electric shock), and the change in conductivity (resistance value) The voltage is converted into a voltage value by a dividing circuit composed of 51b and 52 and input to the calculation means 44. After the calculation of conversion to the detected weight value by an approximate expression or table data is performed, the voltage is output to the control means 41. Then, based on the bottom surface temperature value detected by the temperature detection element 40a and the detection weight value detected by the weight detection element 53, the selected cooking menu (comparison excluding “warming”, “cooking rice”, and the like) The inverter 36 is controlled by electric power set by a control sequence of automatic cooking at a low temperature. For example, in the case of the automatic “warming” menu, heating is performed with a high heating power (electric power) of 1000 W immediately after the start of heating. However, when the temperature of the cooked food becomes high, the heating power is reduced, and hot cooking is performed from 300 W to 450 W. Since the inverter 36 realizes a low heating power by stepless adjustment instead of turning on and off, automatic hot-fire cooking with less uneven heating and spilling is also possible. In addition, the bottom temperature of the object to be heated 32 can be detected by the temperature detection element 40a, and an accurate load amount can be determined from the detected weight value of the weight detection element 53. Therefore, the responsiveness is extremely fast and is necessary for cooking. It is possible to realize a delicate fire. In addition, in the case of the automatic “cooking” menu, if the empty weight of the pan used in advance is stored and registered, the total number can be determined by the detected weight value detected by the weight detecting element 53 before heating. It becomes possible to adjust the heating power by the inverter 36 so as to obtain an ideal rice cooking temperature curve of “choro choro / medium pappa ...”. In this case, in order to avoid misjudgment of the total number judgment based on the detected weight value, it is assumed to be one cup unit.

  Since the temperature of the weight detection element 53 rises during cooking, if there is no temperature compensation at the zero point, the output voltage also rises as shown in FIG. However, the temperature detection element 40a is used as a temperature sensor for detecting the temperature of the weight detection element 53 (equal to the bottom surface temperature of the object to be heated 32), and the resistance change due to the temperature is the integrated resistance 54a. , 54b, 55, and 56, the voltage is converted into a minute voltage change and applied to the integrated resistor 52 via the voltage follower 57 and the integrated resistor 51a. Since this minute voltage change is added to the output of the weight detection means 43 and output, the change in the output voltage due to the temperature of the weight detection means 43 is canceled as shown in FIG. Is possible.

  In the present embodiment, since the weight detection element 53 is a pressure-sensitive conductive sheet, and the “stir-fried food” is not included in the automatic cooking menu, a material having an operating temperature range of −10 ° C. to + 200 ° C. is used. it can. For example, a silicon rubber sheet (-60 ° C to + 230 ° C), a silicone rubber sheet (-60 ° C to + 200 ° C), a fluororubber sheet (-60 ° C to + 200 ° C), or the like can be used.

  Further, in the present embodiment, the resistors 51a to 56 can be inexpensive and stable voltage dividing circuits by using integrated resistors. The integrated resistor has a plurality of resistance elements in the same package, and the single unit has a temperature coefficient of 80 ppm / ° C. This is a case where each is seen one by one. In this case, 2 ppm / ° C. becomes the standard value (5 ppm / ° C. at the worst value). In other words, when the voltage divider circuit as shown in FIG. 3 is used, if a resistance element in the same package of the integrated resistor is used, the same as when each of the precision fixed resistors of 1 to 2 ppm / ° C. is used. Stability will be obtained at a lower price. An arbitrary resistance value can be easily created by combining a number of the same resistance elements in series and parallel.

  Further, in the present embodiment, by using the weight detection element 53 as a load cell that detects the amount of distortion of the top plate 33, it is possible to make the operating temperature range exceeding + 200 ° C.

  FIG. 6 shows a circuit diagram of the weight detection means 43 using a load cell. The bridge circuit 62, that is, the weight detecting means 43 in FIG. 1 is configured by the load cells 60a to 60d made of a nonmagnetic material and the integrated (network) resistor 61b, and outputs a voltage corresponding to the weight of the object to be heated 32. (SIG +, SIG-). A voltage Vcc is supplied from a DC power source (not shown) to the bridge circuit 62, the control means 41, the operation display means 42, the calculation means 44, and the like. A value VTH obtained by dividing the voltage Vcc by the temperature detection element 40a and the integrated resistors 54a and 54b is input to the computing means 44 as temperature information of the bottom surface of the article 32 to be heated, and further divided by the integrated resistors 55 and 56. Input to the voltage follower 57. The output of the voltage follower 57 is connected to the integrated resistor 61b via the integrated resistor 61a, thereby converting the resistance change due to the temperature of the temperature detecting element 40a into a minute voltage change, and the bridge circuit 62 (weight detecting means). The zero point temperature compensation voltage is added to the output of the bridge circuit 62.

  In addition, it goes without saying that a filter circuit for removing 50/60 Hz hum noise and inductive noise of the inverter 36 of 20 kHz to 40 kHz may be connected to the output of the weight detection means in the present embodiment. Absent. In particular, in the case of a bridge circuit, since a minute signal called a difference due to a load of a load cell resistance value is handled by differential amplification, the S / N ratio can be improved.

  As described above, in the present embodiment, even if the ambient temperature of the weight detecting means fluctuates and the detected weight value drifts, the weight characteristic is accurately measured regardless of the ambient temperature in order to correct the temperature characteristic of the detected weight. As well as being able to detect, the temperature characteristics of the weight detection means are corrected by the detected temperature output of the temperature detection means for controlling the equipment, so there is no need to install a special temperature sensor separately, and there is no need for additional parts, assembly, or adjustment man-hours. The cost of the entire apparatus can be reduced.

(Embodiment 2)
FIG. 7 shows a device control apparatus according to Embodiment 2 of the present invention.

  The figure shows an induction heating type rice cooker as an example. The rice cooker is provided with an openable / closable lid 21 at the top of the main body 20, a protective frame 23 for storing the pot 22 in the main body 20, and an air layer 24 formed between the pot 22 and the protective frame 23. Insulated. The heating means 25 is for inductively heating the pot 22 and is provided on the bottom surface and the lower side of the protective frame 23. The weight detection means 26 detects the amount of cooked rice, is composed of a strain gauge, and is pressed by a lever 28 that is operated by a pan detection unit 27 provided on the bottom surface of the pan 22. The lever 28 is attached to the protective frame 23, and when the contact portion with the pan detection unit 27 is pushed down, distortion occurs in the strain gauge attaching portion of the weight detection means 26, and the object to be heated (pan 22 + rice + water). ) Can be detected. The temperature detection means 29 provided in the pot detection unit 27 is configured to pass through a hole provided in the bottom of the protective frame 23 and contact the outer bottom of the pot 22 so as to detect the temperature of the food in the pot 22. ing.

  The control sequence of the rice cooker is stored in the first storage means 65, and the rice cooking course is selected by the operation table means 66. The control means 67 controls the oscillation output of the inverter 30 that supplies high-frequency current to the heating means 25 in accordance with the detected temperature of the temperature detecting means 29, the detected weight of the weight detecting means 26, and the selected control sequence. The second storage means 68 stores table data indicating the relationship between the slope of the output temperature characteristic of the weight detection means 26 and the ambient temperature, and the correction calculation means 69 is based on the detected temperature output value of the temperature detection means 29. The inclination of the output temperature characteristic is read from the second storage means 68, and the temperature correction calculation of the detected weight value of the weight detecting means 26 is performed. In addition, a blower means 70 for cooling the inverter 30 and the heating means 25 is provided inside the main body 20.

  About the rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the user puts an appropriate amount of rice and water according to the amount of rice into the pot 22, selects a course such as white rice, brown rice, and rice cake with the menu switch in the operation display means 66, and turns the rice cooking switch on. When turned on, the control means 67 first detects the temperature around the weight detection means 26 with the temperature detection means 29. At the beginning of rice cooking, the temperature around the pan 22, the protective frame 23, and the weight detection means 26 is substantially equal, and the temperature of the weight detection means 26 can be detected without providing a special temperature sensor. Based on this detected temperature value, the slope of the output temperature characteristic stored in the second storage means 68 is read out, and the correction calculation means 69 corrects it to the detected weight value of the weight detection means 26 (pan 22 + rice + water total weight). The result of the calculation is output to the control means 67. That is, by performing the correction calculation based on the inclination of the output temperature characteristic, in addition to the temperature correction of the zero point, the temperature correction of the value in the state in which the weight of the pot, rice, and water is loaded is possible. The control means 67 detects the amount of rice and water (rice cooking amount) based on the calculation result, and controls the on-time of the switching element of the inverter 30 based on the detected rice cooking amount, so that the pre-cooking process / cooking process -The heating output of the heating means 25 in the unevenness process is controlled to an optimum value according to the amount of rice cooking, and heating is performed with a heating output along an ideal rice cooking curve. For this reason, delicious rice can be cooked regardless of the amount of cooked rice.

  In the present embodiment, since the weight detection means 26 is provided in the space between the lower portion of the protective frame 23 and the main body 20, a large installation space can be taken and the structure can be easily configured.

  In the present embodiment, the load change due to the opening and closing of the pan 22 is configured to be minute due to the configuration of the flange, the seal, and the like. However, a cover open / close switch is provided to detect a load change due to the lid 21. It is good also as a structure.

  In this embodiment, the amount of cooked rice is detected at the same time as the start of the pre-cooking process, but may be detected before the pre-cooking process. Further, the weight detection means 26 may detect the amount of water, the amount of rice, etc. to detect the amount of water evaporation, and control the heating output according to the amount of evaporation to cook rice. You may make it carry out heat control of heat retention according to the amount of rice.

  In the present embodiment, the air blowing means 70 is operated for a predetermined time before temperature detection and weight detection, and the air in the main body 20 is agitated, so that the ambient temperature inside the main body 20 is made uniform and the temperature rises. Thus, it is possible to cool the parts, and more accurate weight detection can be performed.

(Embodiment 3)
8 and 9 show a device control apparatus according to Embodiment 3 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 8, a pulse waveform is output from the oscillation circuit 71. Based on this waveform, the pulse voltage applying means 72 converts the DC power supply voltage Vcc into a pulse voltage, and this pulse voltage is a bridge circuit which is a weight detection means. 62. Thereby, the self-heating of the weight detection element constituting the weight detection means is reduced.

  About the control apparatus of the apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when detecting the weight, a pulse waveform having a predetermined period is output from the oscillation circuit 71 as shown in FIG. 9A, and the switching element in the pulse voltage applying means 72 is turned on / off according to this pulse waveform. Thus, the DC power supply voltage Vcc is converted into a pulse voltage and supplied to the load cells 60a to 60d made of a nonmagnetic material and the bridge circuit 62 of the integrated (network) resistor 61b. The on-time of the pulse may be the time required to convert the detected weight value into a digital value, that is, the length of the AD conversion time, and may be from about one cycle of 50/60 Hz (about 20 ms) to about 100 ms. In order to reduce the self-heating of the load cell, the off time is set to a length of 8 times or more of the on time. Note that the AD conversion start timing is that the load cells 60a to 60d start self-heating by applying a pulse voltage, and the output starts to slightly increase ((b) in FIG. 9 shows the same behavior as a so-called heating element. After a few hours, the amount of heat generated and the amount of heat released become stable, and after that, only fine fluctuations occur). Therefore, a fixed timing synchronized with and delayed from the rise of the output on of the oscillation circuit 71 is performed at (c) in FIG. . Further, the output of the voltage follower 57 is connected to the integrated resistor 61b via the integrated resistor 61a, thereby converting the resistance change due to the temperature of the temperature detecting element 40a into a DC minute voltage change and adding it to the output of the bridge circuit 62. However, since it is a minute voltage, the load cells 60a to 60d do not generate self-heating.

  As described above, in the present embodiment, the pulse voltage applying unit 72 supplies the pulse voltage to the bridge circuit 62 (weight detection unit), and the driving is performed so that the self-heating of the load cells 60a to 60d of the bridge circuit 62 does not occur. By applying the voltage, it is possible to eliminate the influence of the resistance change of the load cells 60a to 60d due to self-heating, so that the performance of the load cells 60a to 60d can be sufficiently extracted, and more accurate weight detection is performed. Is possible.

Further, since the general heat output (due to temperature change) of the load cell is about 2 × 10 ⁻⁶ strain / ° C., the minute voltage for temperature compensation may be about −0.001 mV / ° C.

In addition, the voltage follower according to the present embodiment is a constant current circuit, the resistance change due to the temperature of the temperature detection element 40a is converted into a current change, and supplied to the bridge circuit 62, whereby the influence of the self-heating of the load cells 60a to 60d is achieved. (This is because, if the combined resistance of the bridge circuit is Rg, the heating value W1 of the load cell in the voltage application method is Vcc ² / Rg, and the heating value W2 in the constant current application method is I ² × Rg. Can be easily calculated from

(Embodiment 4)
FIG. 10 shows a device control apparatus according to Embodiment 4 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in the figure, the output of the first reference value setting means 73 and the output of the temperature detection means 40 are compared by the first comparison means 74, and the abnormality display means 75 is driven according to the comparison result. That is, when the detected temperature of the temperature detecting means 40 exceeds the preset upper limit temperature of use of the weight detecting means 43, an error display means 75 is used to display the weight detection error, and there are many errors. A warning is given to the user so that weight detection is not performed.

  About the control apparatus of the apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the first comparison unit 74 compares the temperature detected by the temperature detection unit 40 with the first predetermined temperature set by the first reference value setting unit 73, and displays an abnormality display above the first predetermined temperature. The means 75 is turned on and a weight detection error is displayed. When the temperature is lower than the first predetermined temperature, the light is turned off. The weight detection means 43 has a use upper limit temperature, and it is possible to eliminate the failure of the weight detection means 43 by notifying the user that the weight detection is performed exceeding the upper limit temperature.

  As described above, in the present embodiment, the abnormality display means 75 is turned on / off to notify the user before the occurrence of the abnormality of the weight detection means 43, so that cooking is performed exceeding the upper limit temperature. This can be shown visually, and the user can clearly recognize that cooking is exceeding the upper limit temperature even when the sound during cooking or the noise environment is poor.

  Further, the abnormality display means 75 according to the present embodiment may alert the user of an abnormal state by continuously lighting in the normal state and changing to blinking in the abnormal state. The display is not limited to lighting / extinguishing, but may be voice, warning sound, abnormal character display, or a combination thereof.

  The first reference value setting means 75 may be a value stored in the ROM of the microcomputer or a value set by an external circuit using a semi-fixed resistor or the like.

(Embodiment 5)
FIG. 11 shows a device control apparatus according to Embodiment 5 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in the figure, the output of the second reference value setting means 76 and the output of the temperature detection means 40 are compared by the second comparison means 77, and the abnormality display means 78 is driven according to the comparison result. That is, when the detected temperature of the temperature detecting means 40 is lower than the preset lower limit temperature of the weight detecting means 43, an error display means 78 is used to display the error of the weight detection. A warning is given to the user so as not to detect a large amount of weight.

  About the control apparatus of the apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the second comparing means 77 compares the detected temperature of the temperature detecting means 40 with the second predetermined temperature set by the second reference value setting means 76, and if it is less than the second predetermined temperature, an abnormal display is displayed. The means 78 is turned on and a weight detection error is displayed. When the temperature is higher than the second predetermined temperature, the light is turned off. The weight detection means 43 has a lower limit temperature for use, the weight value is detected below this lower limit temperature, and the user is informed that cooking is performed with the detected weight value with a large amount of error. The error can be reduced.

  As for the display of the abnormality display means 78, various things can be considered as in the case of the abnormality display means 75 in the fourth embodiment. The second reference value setting unit 76 is the same as the first reference value setting unit 73.

(Embodiment 6)
FIG. 12 shows a device control apparatus according to Embodiment 6 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in the figure, the output of the third reference value setting means 79 and the output of the temperature detection means 40 are compared by the third comparison means 80, and the weight detection by the weight detection means 43 is stopped based on the comparison result. . That is, when the detection temperature of the temperature detection means 40 is in a temperature range close to the preset upper limit temperature of use of the weight detection means 40, the weight detection is stopped, and based on erroneous weight detection. This prevents the control sequence from being executed.

  About the control apparatus of the apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the third comparison unit 80 calculates the temperature detected by the temperature detection unit 40 and the third predetermined temperature set by the third reference value setting unit 79 (temperature range close to the upper limit temperature of use of the weight detection unit 40). In comparison, at a temperature equal to or higher than the third predetermined temperature, a stop signal is output to the calculation means 44, and weight detection is stopped. When the temperature is lower than the third predetermined temperature, detection is performed. The weight detection means 43 has a use upper limit temperature, and it is possible to avoid cooking in a state where there are many detection errors in a temperature region close to the upper limit temperature.

  As described above, in the present embodiment, since the detection of the weight detection means 43 is stopped in a temperature region close to the upper limit temperature, the detected weight value is not output when cooking is performed in a state where there are many errors. Moreover, cooking can be easily stopped by the control means 41.

  Note that the comparison unit 80 of the present embodiment may notify the user of the abnormal state by stopping the drive of the inverter 36 in the event of an abnormality.

(Embodiment 7)
FIG. 13 shows a device control apparatus according to Embodiment 7 of the present invention. The same elements as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in the figure, the output of the fourth reference value setting means 81 and the output of the temperature detection means 40 are compared by the fourth comparison means 82, and the weight detection by the weight detection means 43 is stopped based on the comparison result. . That is, when the detected temperature of the temperature detecting means 40 is in a temperature range close to the preset lower limit use temperature of the weight detecting means 43, the weight detection is stopped and based on erroneous weight detection. This prevents the control sequence from being executed.

  About the control apparatus of the apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the fourth comparison means 82 uses the temperature detected by the temperature detection means 40 and the fourth predetermined temperature set by the fourth reference value setting means 81 (a temperature range close to the use lower limit temperature of the weight detection means 43). In comparison, if the temperature is lower than the fourth predetermined temperature, a stop signal is output to the calculation means 44 and the weight detection is stopped. If the temperature is equal to or higher than the fourth predetermined temperature, detection is performed. The weight detection means 43 has a lower limit temperature for use, and it is possible to avoid cooking in a state where there are many detection errors in a temperature range close to the lower limit temperature.

  As described above, in the present embodiment, since the detection of the weight detection means 43 is stopped in a temperature region close to the lower limit temperature, the weight detection value is not output when cooking is performed in a state where there are many errors. Moreover, cooking can be easily stopped by the control means 41.

  Moreover, the comparison means 82 of this Embodiment may notify a user of an abnormal state by stopping the drive of the inverter 36 at the time of abnormality.

  In addition, although each above-mentioned Embodiment 1-7 demonstrated as a control apparatus in a cooking appliance, it is applicable also to a general household appliance. For example, in a dishwasher, the present invention can be applied to the relationship between temperature detection of washing water (object to be heated) and weight detection of washing water + tableware, and the application range is not limited.

  As described above, the device control apparatus according to the present invention can accurately detect the weight regardless of the ambient temperature, so that it is a general household appliance such as an electromagnetic cooker, a rice cooker or a microwave oven, or a dishwasher. It can also be applied to.

The block diagram of the control apparatus of the apparatus in Embodiment 1 of this invention Exploded perspective view of the equipment Circuit diagram of the controller Characteristic diagram showing the load-resistance value of the weight detection element in the control device Characteristic diagram showing temperature characteristic example of the same weight detection element Circuit diagram different from FIG. 3 in the same control device The block diagram of the control apparatus of the apparatus in Embodiment 2 of this invention The circuit diagram of the control apparatus of the apparatus in Embodiment 3 of this invention The figure which shows the operation timing of the same circuit The block diagram of the control apparatus of the apparatus in Embodiment 4 of this invention The block diagram of the control apparatus of the apparatus in Embodiment 5 of this invention The block diagram of the control apparatus of the apparatus in Embodiment 6 of this invention The block diagram of the control apparatus of the apparatus in Embodiment 7 of this invention

Explanation of symbols

25, 34 Heating means 26, 43 Weight detection means 29, 40 Temperature detection means 32 Heated object 30, 36 Inverter 40a Temperature detection element 41, 67 Control means 44 Calculation means 47, 70 Blower means 53 Weight detection element 65 First Storage means 68 Second storage means 69 Correction calculation means 71 Oscillation circuit 72 Pulse voltage application means 73, 76, 79, 84 First to fourth reference value setting means 74, 77, 80, 82 First to fourth Comparison means 75, 78 Abnormal display means

Claims (8)

Heating means for heating the object to be heated, temperature detecting means for detecting the temperature of the object to be heated, weight detecting means for detecting the weight of the object to be heated, detected temperature of the temperature detecting means, and weight detecting means Control means for controlling the heating output of the heating means in accordance with the detected weight and the control sequence, the temperature detecting means adds the detected output to the detected output of the weight detecting means, and detects the temperature of the detected weight. A device control device that corrects characteristics. Heating means for heating the object to be heated; temperature detecting means for detecting the temperature of the object to be heated; weight detecting means for detecting the weight of the object to be heated; first storage means for storing a control sequence; The control means for controlling the heating output of the heating means according to the detection temperature of the temperature detection means, the detected weight of the weight detection means and the control sequence, and the relationship between the slope of the output temperature characteristic of the weight detection means and the ambient temperature. A second storage means for storing the table data shown, and a correction calculation means for performing a temperature correction calculation of the detected weight value of the weight detection means, wherein the correction calculation means is an output value of the detected temperature of the temperature detection means. Thus, the device control apparatus reads the inclination of the output temperature characteristic from the second storage means and performs temperature correction calculation of the detected weight value. The apparatus control device according to claim 1, further comprising a blowing unit that cools the heating unit, wherein the air temperature is uniformed by the blowing unit to detect the weight of the object to be heated. Heating means for heating the object to be heated, temperature detecting means for detecting the temperature of the object to be heated, weight detecting means for detecting the weight of the object to be heated, detected temperature of the temperature detecting means, and weight detecting means Control means for controlling the heating output of the heating means according to the detected weight and the control sequence, and pulse voltage applying means for applying a driving voltage to the weight detecting means, and the temperature detecting means outputs the detected output. In addition to the detection output of the weight detection means, the temperature characteristic of the detected weight is corrected, and the pulse voltage application means supplies the pulse voltage to the weight detection means, and the weight detection element constituting the weight detection means The device control device according to claim 1, wherein self-heating of the device is reduced. The apparatus control according to any one of claims 1 to 4, wherein when the detected temperature of the temperature detecting means exceeds a preset upper limit temperature of use of the weight detecting means, a weight detection error is displayed. apparatus. The apparatus according to any one of claims 1 to 4, wherein when the detection temperature of the temperature detection means is lower than a preset lower limit use temperature of the weight detection means, an error display of weight detection is performed. Control device. The apparatus according to any one of claims 1 to 4, wherein when the temperature detected by the temperature detecting means is in a temperature range close to a preset upper limit temperature of the weight detecting means, the weight detection is stopped. Control device. The apparatus according to any one of claims 1 to 4, wherein when the temperature detected by the temperature detector is in a temperature range close to a preset lower limit temperature of the weight detector, the weight detection is stopped. Control device.

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