Multi-way PID (proportion integration differentiation) temperature control device and control method thereof

Abstract

The invention provides a multi-way PID temperature control device and a control method thereof, and belongs to the technical field of automatic control. The multi-way PID temperature control device solves the problem that the dynamic temperature of all positions of a heating plate can not be balanced in the prior art. The multi-way PID temperature control device comprises a control unit, an alternating current power supply, a plurality of temperature sensors, a plurality of thyristor power regulators and a plurality of heating tubes, wherein each heating tube corresponds to one temperature sensor and one thyristor power regulator; each temperature sensor is connected with the input terminal of the control unit; each thyristor power regulator is connected with the output terminal of the control unit; the alternating current power supply and the heating tubes are respectively connected with the thyristor power regulators. The control device and the control method ensure that the dynamic temperature balance of a mold temperature controller heating plate keeps identical, the dynamic accuracy is high, and a die is uniformly heated.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and relates to a multi-channel PID temperature control device and a control method thereof. Background technique [0002] In the field of automatic control, the single-variable PID control system has been very mature and widely used, such as in the mold temperature control machine (referred to as the mold temperature machine) has a wide range of applications. The hot plate system heated by the electric heating tube is one of the main forms of the mold temperature control machine. In the existing mold temperature machine, the single variable PID controller is generally used to realize the temperature control. In the larger heating system, multiple An independent temperature control system for temperature control. In this way, although a single temperature control device achieves high-precision control, due to the different factors such as the power of each heating tube, the distance bet...

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Problems solved by technology

Although the present invention makes the heating of the injection molding machine more accurate, the invention realizes mold heating balance and uniformity by controlling the opening or closing of the heating module and the opening or closing of the water flow control valve. The life of the heating plate is affected, and the problem that the dynamic temperature balance of the heating plate is consistent is not solved

[0004] Chinese Invention Patent Application Publication No. CN200710053106.8 discloses a multi-channel high-precision temperature controller. Although the multi-channel high-precision temperature controller integrates several PID temperature controllers, there is no real-time control between the PID controllers. Synchronous adjustment, can't realize the balanced temperature control of the heating plate

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