The circuit of sampling input is made up of inner comparer of AT89C2051 instead of traditional ADC chip according to the theory of A/D conversion, and the system of temperature controlling can be constructed by less chips.
It has no way to establish a mathematics model due to the complicated characteristics of electrical heater's temperature controlling. So the text adopt method that combine together ES and PID control to aim directly at the situation that PID control cann't fitted for whole process of controlling temperature very well.
This paper introduces the stove temperature controlling system controlled by MC68HC908QY4 single-chip computer. It studies the basic principle and frame of the system,analyze the mathematic model and algorithm and design of software and hardware. Meanwhil e,some hardwara circuit diagram and flow charts of software are given.
Average strengths in tension of 2.75×109 N/m2 (400×103 lb f/in.2) are reported using this temperature controlling method compared with 2.5×109 N/m2 (360×103 lb f/in.2) for similar diameter material grown using a constant power mode system.
A melt temperature controlling device, dependent on the infra-red emitted from the melt area at which the filament is withdrawn, was developed and used to grow filament of constant diameter in the growth rate range 2.5 to 7.5 cm/min.
In the developed model, the optimization module of the water distribution of secondary cooling zone was established according to the metallurgical criterion for billet and target temperature controlling principle.
In order to achieve that some modifications on temperature controlling and measunng systems have been introduced.
This paper introduces a new method for automatic proportional band selection and automatic steady state error reduction in computer controlling. It minimizes steady state error and gives appropriate gain to proportional adjustors. It is very convenient to use, and it is not necessary for us to know the system parameters. Satisfactory results have already been attained in temperature controlling.
The electrical-heating magnetic stirrer is controlled by a bistable oscil- latory circuit in which a thermistor is used as a thermal sensor.This ins- trument can be adjusted continuously in the range of 20℃ to 100℃.The pre- cision of temperature controlling is within±0.5℃,It has a good repeatibility and can be used conveniently.
A temperature controlling process of the electric furnace by means cf the fuzzy control is proposed in this paper.The process consists of three stages of temperature by time. Elevated ,invariable and cooling rapidly. Each stage of temperature can be controlled by the track of temperature using toe fuzzy control. A simlifed fuzzy control alogrithms is also put forward.