Self-adaptive PID (proportion integration differentiation) temperature control method

A temperature control method and self-adaptive technology, applied in the direction of self-adaptive control, temperature control, general control system, etc., can solve the problems such as the inability to control the heating speed well, the temperature control method can not be self-adapted, etc., to achieve satisfactory accuracy, heating process stable effect

Inactive Publication Date: 2012-08-29
湖南迪斯生物技术股份有限公司
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Problems solved by technology

[0012] In order to solve the problem that the current temperature control method cannot be self-adaptive and cannot control the heating rate well, the present invention provides an adaptive PID temperature control method that can effectively control the heating rate and can adapt to various instruments

Method used

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  • Self-adaptive PID (proportion integration differentiation) temperature control method
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  • Self-adaptive PID (proportion integration differentiation) temperature control method

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Embodiment Construction

[0038] see figure 2 , the present invention comprises the following steps:

[0039] Step 1: Real-time collection of temperature, the frequency of real-time collection is once every two seconds, and the accuracy of temperature collection is 0.0625°C.

[0040] Step 2: Real-time calculation of the heating rate, the calculation formula is:

[0041] H_S=(T_current-T_before) / T int

[0042] Wherein T_current is the current temperature, and T_before is the temperature before the predefined specified time, and the predefined specified time in the present invention is 30 seconds, T int for the time interval.

[0043] Step 3: Adjust the PID parameters according to the real-time heating speed. When the heating speed H_S is greater than the maximum preset value, reduce K in the PID calculation formula P , making the PWM_OUT output decrease, K P It is a positive integer. In this embodiment, the maximum preset value of the heating speed H_S is 0.2. When the heating speed H_S is greate...

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Abstract

The invention discloses a self-adaptive PID (proportion integration differentiation) temperature control method, which comprises the following steps of: step 1, collecting a temperature in real time; step 2, calculating a heating speed in real time; step 3, adjusting a PID parameter according to the real-time heating speed; step 4, carrying out PID arithmetic; and step 5, converting the result of the PID arithmetic into continuous control on a time quantum, and directly controlling the switching on and the switching off of the working current of a heater strip by using a bidirectional silicon controlled rectifier. The technical effects of the self-adaptive PID temperature control method lie in that the heating speed is calculated in a heating process; a control parameter is adjusted dynamically, so that the heating process is more stable; the algorithm is subjected to multiple tests on a plurality of different instruments at different ambient temperatures; results show that an appointed temperature can be stably achieved in a heating way; an overshoot phenomenon cannot appear in the heating process; and the precision meets a system requirement.

Description

technical field [0001] The invention relates to an adaptive PID temperature control method. Background technique [0002] In biological experiments, since there are often extremely strict requirements on the experimental temperature, the most critical part of various instruments used to realize biological reactions is the control of temperature. Usually, the temperature control system is nonlinear and has pure hysteresis. Inertial system, so the controlled object of the temperature control system can be represented by a first-order inertial link plus a delay link, and its transfer function is: [0003] G ( s ) = Ke - T · s T c · s + 1 [0004] where K is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/00G05B13/04
Inventor 俞俊民
Owner 湖南迪斯生物技术股份有限公司
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