1. A method for controlling the exhaust flow from a cooking chamber of a baking oven, the flow being discharged by a fan, the method comprising the steps:
increasing a speed of the fan during a first time interval after a predetermined heat up phase of a cooking process;
measuring a first temperature at a first location of the baking oven using a first temperature sensor during the first time interval;
measuring a second temperature at a second location of the baking oven using a second temperature sensor at a same time as the measuring of the first temperature during the first time interval;
determining a temperature difference between the first temperature and the second temperature using an electronic controller of the baking oven;
determining a selected fan speed at which the determined temperature difference varies from an initial temperature difference, the initial temperature difference being the determined temperature difference at the beginning of the first time interval; and
setting at least one of the fan speed and a position of a bypass damper during a second time interval as a function of the determined selected fan speed.
2. The method as recited in claim 1, wherein the first and second locations are different.
3. The method as recited in claim 1, wherein the first temperature corresponds to a temperature of exhaust air from the cooking chamber and the second location is in a lower portion of the cooking chamber.
4. The method as recited in claim 1, further comprising maintaining the first temperature substantially constant during the first time interval using a cooking chamber heating element and a temperature controller.
5. The method as recited in claim 1 further comprising:
increasing the speed of the fan during a third time interval of the cooking process;
measuring a third temperature using the first temperature sensor during the third time interval;
measuring a fourth temperature using the second temperature sensor at a same time as the measuring of the third temperature during the third time interval;
determining another temperature difference between the third temperature and the fourth temperature using the electronic controller;
determining another selected fan speed at which the other determined temperature difference varies from another initial temperature difference, the other initial temperature difference being the other temperature difference determined at the beginning of the third time interval; and
setting at least one of the fan speed and the position of the bypass damper during a fourth time interval as a function of the other determined selected fan speed.
6. The method as recited in claim 1, wherein the second time interval is longer than the first time interval.
7. The method as recited in claim 1, further comprising selecting a duration of the first time interval such that the difference in temperature would be constant given a constant rate of the exhaust flow.
8. The method as recited in claim 1 wherein the set fan speed is within 10% of the selected fan speed.
9. The method as recited in claim 1 wherein the increasing is performed so as to increase the fan speed from a low fan speed at which only a part of vapors produced during the cooking process is discharged from the baking oven to a last fan speed which is the determined selected fan speed.
10. The method as recited in claim 1 wherein the fan speed is increased in at least one of a continuous and stepwise manner during the first time interval.
11. A baking oven comprising:
a cooking chamber;
a fan for removing exhaust air from the cooking chamber through an exhaust conduit;
a bypass damper disposed in the exhaust conduit;
a first temperature sensor disposed in a first location of the baking oven and configured to measure a first temperature of the cooking chamber during a first time interval;
a second temperature sensor disposed in a second location of the baking oven and configured to measure a second temperature of the cooking chamber during the first time interval; and
an electronic controller having an evaluation circuit and a memory, the electronic controller configured to:
increase a speed of the fan during the first time interval,
determine a temperature difference between the first temperature and the second temperature using the evaluation circuit,
determine a selected fan speed at which the determined temperature difference varies from an initial temperature difference, the initial temperature difference being the determined temperature difference at the beginning of the first time interval, and
set at least one of the fan speed and a position of the bypass damper during a second time interval as a function of the determined selected fan speed.
12. The baking oven recited in claim 11, wherein the first temperature sensor is disposed in an upper portion of the cooking chamber and the second temperature sensor is disposed in a lower portion of the cooking chamber.
13. The baking oven recited in claim 11, further comprising a heating element, and
wherein the electronic controller is further configured to control the heating element such that the first temperature is maintained at a constant value during the first time interval.
14. The baking oven recited in claim 11, wherein the first temperature corresponds to a temperature of exhaust air from the cooking chamber, and the second location is in a lower portion of the cooking chamber.
15. The baking oven recited in claim 11, wherein the first temperature sensor is further configured to measure a third temperature during a third time interval,
the second temperature sensor is configured to measure a fourth temperature during a third time interval, and
the electronic controller is further configured to:
increase a speed of the fan during the third time interval,
determine another temperature difference between the third temperature and the fourth temperature using the evaluation circuit,
determine another selected fan speed at which the other determined temperature difference varies from another initial temperature difference, the other initial temperature difference being the other determined temperature difference at a beginning of the third time interval, and
set at least one of the fan speed and a position of the bypass damper during a fourth time interval as a function of the other determined selected fan speed.
16. The baking oven recited in claim 11, wherein the second time interval is longer than the first time interval.
17. The baking oven recited in claim 11, wherein a duration of the first time interval is such that the difference in temperature would be constant given a constant rate of the exhaust flow.
18. The baking oven recited in claim 11, wherein the set fan speed is within 10% of the selected fan speed.
19. A method for controlling the exhaust flow from a cooking chamber of a baking oven, the flow being discharged by a fan, the method comprising the steps:
increasing a speed of the fan during a first time interval after a predetermined heat up phase of a cooking process;
measuring a first temperature at a first location of the cooking chamber using a first temperature sensor during the first time interval;
measuring a second temperature at a second location of the cooking chamber using a second temperature sensor at a same time as the measuring of the first temperature during the first time interval, the second temperature sensor being disposed at a different location than the first temperature sensor in the baking oven;
determining a temperature difference between the first temperature and the second temperature using an electronic controller of the baking oven;
selecting a duration of the first time interval such that the difference in temperature would be constant given a constant rate of the exhaust flow;
determining a selected fan speed at which the determined temperature difference varies from an initial temperature difference, the initial temperature difference being the determined temperature difference at the beginning of the first time interval; and
setting at least one of the fan speed and a position of a bypass damper during a second time interval as a function of the determined selected fan speed.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for storing frequency values, comprising:
actualizing a frequency value contained in a memory cell of an internal memory of a device by an increment or a decrement, wherein each of a number of memory cells of the internal memory contains a respective frequency value;
after a predetermined number of increments andor decrements in the memory cells of the internal memory, determining a maximum frequency value of the frequency values in the memory cells of the internal memory, and transferring the maximum frequency value to a corresponding memory cell of an external memory of the device;
resetting the memory cell of the internal memory that contains the transferred maximum frequency value;
reading content of each memory cell of the internal and external memory after a period of time; and
resetting each memory cell in the internal and external memory.
2. The method according to claim 1, wherein:
the internal and external memory are components of a display memory of a display and the period is an update cycle of the display, which comprises a number of columns;
the increment and respectively the decrement is a hit of a sampled value of a measured signal in a sampled value range and in a time point and respectively in a frequency bin of a pixel of the display corresponding to the memory cell of the internal memory within the update cycle; and
wherein, for each column of the display, the maximum frequency value is determined from the frequency values in the memory cells of the internal memory corresponding to all pixels of the respective column after a specific number of increments and decrements in the memory cells of the internal memory corresponding to all pixels of the corresponding column, and the read content is for updating the pixels of the display.
3. The method according to claim 2, wherein the maximum frequency value of the frequency values in memory cells of the internal memory corresponding to all pixels of a one of the columns, which is incremented or decremented since a last transfer of the maximum frequency value corresponding to the one column, is transferred to the corresponding memory cell of the external memory.
4. The method according to claim 2, wherein the maximum frequency value of each column is transferred to the corresponding memory cell of the external memory after the specific number of increments and decrements plus an integer valued offset, which is different for each column.
5. The method according to claim 2, wherein the transferred maximum frequency value only contains a reduced number of most significant bits of the total number of bits of a memory cell of the internal memory.
6. The method according to claim 2, wherein the maximum frequency value determined for each column of the display, and all the frequency values, are stored in memory cells of the external memory, which are read and respectively written in a same burst, and are transferred simultaneously from the internal memory to the external memory.
7. The method according to claim 6, wherein the frequency values, which are transferred simultaneously with the maximum frequency value determined for the corresponding column of the display, and the determined maximum frequency value, are stored in memory cells of the internal memory, which are read and respectively written simultaneously.
8. The method according to claim 2, wherein a content of a specific number of most significant bits of the memory cell of the internal memory, in which the maximum frequency value is stored, is transferred to a first memory cell of the external memory, if the content of the most significant bits differ from zero, and the content of a corresponding number of least significant bits of the memory cell of the internal memory is transferred to a second memory cell of the external memory.
9. The method according to claim 8, wherein the content of the least significant bits in the memory cell of the internal memory and respectively of the external memory is read and respectively written in a different burst to the content of the most significant bits in the memory cell of the internal memory and respectively of the external memory.
10. The method according to claim 2, wherein resetting includes initializing with an initial value.
11. The method according to claim 10, wherein the initial value is a negative value in the reset memory cell of the internal memory, if the transferred maximum frequency value is a positive value, and the initial value is a positive value in the reset memory cell of the internal memory, if the transferred maximum frequency value is a negative value.
12. A device comprising:
an internal memory and an external memory connected to each other, wherein the internal memory comprises a number of memory cells, each configured to store a respective frequency value;
an actualizing unit configured to actualize the frequency value in a one of the memory cells of the internal memory by an increment or a decrement; and
a control unit configured to, after a predetermined number of increments and decrements in the memory cells of the internal memory, determine a maximum frequency value of the frequency values stored in the memory cells of the internal memory, and to transfer the determined maximum frequency value to a corresponding memory cell of the external memory; and
wherein the control unit is further configured to reset the memory cell of the internal memory that contains the transferred maximum frequency value, to read content of each memory cell of the internal and external memory after a period of time, and to reset each memory cell of the internal and external memory.
13. The device according to claim 12, wherein the device is a measuring device for displaying frequency values of a measured signal on a display of the device, and wherein the internal memory and the external memory are components of a display memory of the device and the frequency values are stored to updates of the display.
14. The device according to claim 13, wherein the period is an update cycle of the display, and wherein the increment and respectively the decrement is a hit of a sampled value of the measured signal in a sampled value range and in a time point and respectively in a frequency bin of a pixel of the display corresponding to the memory cell of the internal memory within the update cycle.
15. The device according to claim 13, wherein the display comprises a number of columns, and wherein, for each column of the display, the determination of the maximum frequency value results from the frequency values in the memory cells of the internal memory corresponding to all the pixels of the corresponding column after a specific number of increments in the memory cells of the internal memory corresponding to all the pixels of the corresponding column, and the read content is for updating the pixels of the display.
16. The device according to claim 13, further comprising a buffer located between the internal memory and the external memory, wherein the buffer is configured to buffer the transferred maximum frequency value corresponding to each column of the display.