TEMPERATURE CONTROL METHOD IN HEATING CHAMBER Russian patent published in 2017 - IPC G05D23/00 

FIELD: test equipment.

SUBSTANCE: temperature control method in the heating chamber includes heating the testing object heating in the vacuum, measuring of the temperature T₁ current value at the testing object, measuring of the temperature T₂ current value at the testing object after the predetermined period of time (t) expiration, calculating the temperature T₁ and T₂ values difference and the determination of the pace and the direction of the temperature values change, the setting of the permissible upper (VG) and lower (NG) temperature range limits at the testing object, the determination of the current temperature position with respect to the lower temperature clearance and with respect to the upper temperature clearance, calculation of the heater control voltage value. In this case, the specified range [VG…NG] is divided into equal internal zones and two additional outer zones are added, one of which is above VG and the other is below NG. Obtain total (n) zones with following numbering of each external and internal zone, prepare the coefficients [K₁…K_2n] array of based on at least two coefficients per each zone, one of which corresponds to the heating K_i2 event, and the other to the cooling event K_i1 of the test object for the given period of time (t) within each zone of its current temperature T₂. Prepare the constants [B₁…B_n] array and select the own constant for each zone, which value corresponds to the position of the zone relative to the center of the specified range [VG…NG], determine the base value of the heater control voltage (U₀). While measuring the current temperatures (T₁) and (T₂), the number of the current zone (i) in which T₁ and T₂ are located respectively in the predetermined time interval (t), after calculating the temperature difference dT=T₁-T₂ evaluate the |dT| and, if the difference is greater than the certain value, produce the cooling or heating. The current temperature values (T₁) and (T₂) measuring at the test object, determination of the zone number in which T₁ and T₂ are located respectively, the temperature difference dT=T₁-T₂ calculation and evaluation of |dT|, complying with the above mentioned conditions, cyclically repeat until the specified temperature mode maintenance time expiration.

EFFECT: reduction of the test time, increase of the tests quality, increase of the products reliability and life during the operating.

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