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1.引言 溫度自动控制在工业生产中应用很广泛。一般仪表的控制精度在±10℃內,但在实际工作中由于热电偶的保护套管影响热传导产生热惰性現象,当炉温变化快时,仪表指示溫度滞后炉內实际溫度使得仪表指示温度与炉內实际溫度之間产生了差別,升溫时仪表指示低于实际溫度,降溫时仪表指示溫度又高于炉內实际溫度。这样使得仪表的控制誤差往往超过±10℃,往往滿足不了生产要求。特別是一些低等級仪表(如1.5級的
1. Introduction Temperature automatic control is widely used in industrial production. General control accuracy of the instrument within ± 10 ℃, but in practice due to the thermocouple protective sleeve heat conduction thermal inertia phenomenon occurs, when the furnace temperature changes quickly, the instrument indicates the actual temperature of the furnace temperature hysteresis makes the instrument indicates the temperature and The difference between the actual temperature in the furnace, when the temperature indicator is lower than the actual temperature, when the temperature indicator indicates the temperature is higher than the actual furnace temperature. This makes the instrument control error often exceed ± 10 ℃, often can not meet the production requirements. In particular, some low-level instruments (such as 1.5 level