Views: 187 times Release date: 2017-12-29 14:53:14
For such fast-heating equipment, the original is not always controlled by temperature response. Because there is a lag from heating to temperature response, even if there is no lag in temperature collection, heating to heating up will take time. As long as the temperature change is slow and stable, you can use the temperature response to control when not changing. Otherwise, it is difficult to control only the response lag, and the temperature lags from implementation to response. The faster the temperature, the more difficult it is to control. Therefore, aviation morning automation professionals do not advocate full response control.
The collection speed is usually 200mS. It is enough for flashing. The rapid heating is mainly controlled by the heating power. The heating cannot be controlled by PID (the PID must be handled by itself when it is stable). Of course, the collection speed also has advantages immediately. Temperature speed In addition to the heating power, it is also related to the response speed of the sensor. The temperature transmission speed is the first assumption. Air conduction is the main assumption. The thickness of the sensor has a large effect. Even if the air reaches 300 degrees, the sensor will lag behind for some time to 300 degrees. The control method must be Write by yourself, the collection speed need not be too harsh.
Assuming that the temperature rises faster and cools down faster, PID adjustment is not required, and continuous heating is turned off when the temperature is reached, and the ON / OFF control of heating when the temperature is low is not good, and the temperature is simply overshooting. The heating power should be preset in advance, and the required heating power is calculated to directly output this power. If stability is required, a part can be reserved for PID adjustment during stability.
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