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4. ERROR RECOGNITION METHOD
After the detection of the boiling temperature, power consumption is reduced just enough to maintain the boiling temperature.
But when cooking mixed rice, the detected temperature during this time sometimes slightly
drops as shown in Fig. 10.
This pattern is caused by local boiling at point A of this figure when the thermal conductivity is obstructed by the mixed contents.
To prevent prolonging of the cooking time due to low level power consumption, when the temperature drops below the predetermined range AT from the previously detected boiling temperature, the sensing operation to detect the accurate boiling temperature restarts by returning the heat consumption to the previous high level.
When heating a pot with a large amount of water covering the sensor cap, patterns of increasing temperature changes may possibly occur as shown in Fig. 11.
In such a case, in order to avoid the micro-computer from recognizing an incorrect temperature as the boiling temperature after a first recognition, this method continues to search the correct boiling point at a level higher than the pre-searched boiling temperature.
When a large electro-magnetic noise occurs in the signal lines, the detected temperature patterns become spire shaped as shown in Fig. 12 (a).
As a matter of course, these spire shaped patterns do not represent the actual temperature.
Therefore, the temperature is quickly checked several times during short intervals, and the deviations of these data are calculated to measure only the actual temperature.
When an imperfect contact between two devices - for example between the thermistor sensor and the A-to-D converter port - occurs, the detected temperature may become like this pattern, as shown here. To detect the continuing fluctuation during a certain period, the imperfect contact condition can be checked, and then the cooking operation is stopped, indicated by a sign on the front panel that the cooker is out of order.
When the thermistor sensor breaks down and causes an open circuit, the detected temperature drops and continues at an extremely low level as shown in Fig. 12 (b).
As a matter of fact, this temperature sensing circuit makes big errors when the temperature is very low, as previously-mentioned, so it is difficult to detect this open circuit immediately.
Therefore, we have introduced another method which shows whether the temperature rise exists or not during a certain period when the cooking heater is activated.
After the recognition of this breakdown, the same operation is activated like the condition of the imperfect contact described above.
When the thermistor sensor breaks down and causes a short circuit, the detected temperature rises extremely high as shown in Fig. 12 (b).
After detecting such a high temperature, the cooking operation is also stopped.
It may happen that users operate this cooker with an empty pot.
In such a case, this condition is checked as to whether the detected temperature is lower or higher than the predetermined temperature T1 during the 1st stage of the cooking operation.
The reason to equip the cooker with so many recognition methods is to prevent misjudgement and fire outbreak in cooking.
Besides these error recognition methods, when a power failure occurs, the data in the micro-computer are kept in a hold mode and the real-time-clock IC keeps correct time at low power consumption during the powerfailure.
After power resumption, this system calculates the lapsed time of power failure to decide the next appropriate cooking process.
A 24-hour power failure period is guaranteed by this system.
4. ERROR RECOGNITION METHOD
After the detection of the boiling temperature, power consumption is reduced just enough to maintain the boiling temperature.
But when cooking mixed rice, the detected temperature during this time sometimes slightly
drops as shown in Fig. 10.
This pattern is caused by local boiling at point A of this figure when the thermal conductivity is obstructed by the mixed contents.
To prevent prolonging of the cooking time due to low level power consumption, when the temperature drops below the predetermined range AT from the previously detected boiling temperature, the sensing operation to detect the accurate boiling temperature restarts by returning the heat consumption to the previous high level.
When heating a pot with a large amount of water covering the sensor cap, patterns of increasing temperature changes may possibly occur as shown in Fig. 11.
In such a case, in order to avoid the micro-computer from recognizing an incorrect temperature as the boiling temperature after a first recognition, this method continues to search the correct boiling point at a level higher than the pre-searched boiling temperature.
When a large electro-magnetic noise occurs in the signal lines, the detected temperature patterns become spire shaped as shown in Fig. 12 (a).
As a matter of course, these spire shaped patterns do not represent the actual temperature.
Therefore, the temperature is quickly checked several times during short intervals, and the deviations of these data are calculated to measure only the actual temperature.
When an imperfect contact between two devices - for example between the thermistor sensor and the A-to-D converter port - occurs, the detected temperature may become like this pattern, as shown here. To detect the continuing fluctuation during a certain period, the imperfect contact condition can be checked, and then the cooking operation is stopped, indicated by a sign on the front panel that the cooker is out of order.
When the thermistor sensor breaks down and causes an open circuit, the detected temperature drops and continues at an extremely low level as shown in Fig. 12 (b).
As a matter of fact, this temperature sensing circuit makes big errors when the temperature is very low, as previously-mentioned, so it is difficult to detect this open circuit immediately.
Therefore, we have introduced another method which shows whether the temperature rise exists or not during a certain period when the cooking heater is activated.
After the recognition of this breakdown, the same operation is activated like the condition of the imperfect contact described above.
When the thermistor sensor breaks down and causes a short circuit, the detected temperature rises extremely high as shown in Fig. 12 (b).
After detecting such a high temperature, the cooking operation is also stopped.
It may happen that users operate this cooker with an empty pot.
In such a case, this condition is checked as to whether the detected temperature is lower or higher than the predetermined temperature T1 during the 1st stage of the cooking operation.
The reason to equip the cooker with so many recognition methods is to prevent misjudgement and fire outbreak in cooking.
Besides these error recognition methods, when a power failure occurs, the data in the micro-computer are kept in a hold mode and the real-time-clock IC keeps correct time at low power consumption during the powerfailure.
After power resumption, this system calculates the lapsed time of power failure to decide the next appropriate cooking process.
A 24-hour power failure period is guaranteed by this system.