Differential sampling temperature control method of heating system

A technology of sampling temperature and heating system, which is applied in the direction of temperature control using electric mode, which can solve the problems of increasing adjustment period, unable to respond in time, output oscillation, etc., to achieve the effect of enhancing differential effect and suppressing actuator oscillation.

Inactive Publication Date: 2019-06-28
DONGHUA UNIV
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Problems solved by technology

[0009] Simply increasing the sampling interval to increase the temperature difference will increase the adjustment period of the enti

Method used

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  • Differential sampling temperature control method of heating system
  • Differential sampling temperature control method of heating system
  • Differential sampling temperature control method of heating system

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Embodiment Construction

[0026] Below in conjunction with specific embodiment, further illustrate the present invention.

[0027] In the present invention, the sampling period of the error change rate of the heating system is set as several times of the error sampling period. Modify the traditional PID control algorithm to the following result:

[0028]

[0029] The characters in the above formula are defined as follows:

[0030]

[0031] In the above formula, the temperature change difference becomes the difference between the temperature obtained by this sampling and the temperature of the previous n times, and k and n are positive integers.

[0032] When the algorithm is implemented, by creating a temperature cache queue, recording the sampling temperature of nearly n times, maintaining a high-speed sampling frequency by exchanging space for time, and obtaining a significant temperature difference to make the differential function effective.

[0033] figure 1 The flow chart of the differen...

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Abstract

The invention provides a differential sampling temperature control method of a heating system. The differential sampling temperature control method comprises the following steps: firstly, acquiring the control target temperature, and sending the control target temperature to a controller; then, opening a temperature caching queue in the storage space of the controller, placing the temperature in each sampling at the tail end of the temperature caching queue, and updating the temperature caching queue in a first-in and first-out manner; then, subtracting the temperature in the temperature caching queue from the target temperature to obtain a temperature feedback error, which is used as an error input variable of a PID controller; using the temperature change speed before and after samplingas an error change rate input variable of the PID controller; controlling the temperature of the heating system through the PID controller. In allusion to a temperature control system having a slow changing process, different sampling frequencies are adopted for the error and the error change rate in a feedback link and the sampling period of the error change rate is set to be several times of theerror sampling period, so that the differential effect of a PID algorithm is enhanced and actuator oscillation of the temperature control system is suppressed.

Description

technical field [0001] The invention relates to the technical field of industrial control, in particular to a differential sampling temperature control method of a heating system. Background technique [0002] Currently, existing temperature control technologies are based on the concept of feedback. The elements of feedback theory consist of three parts: measurement, comparison, and execution. Measure the variable of interest, compare it to the expected value, and use this error correction to adjust the response of the control system. At the same time, the change of the two errors before and after reflects the speed of the target change trend, which has the effect of predicting in the PID control algorithm, and at the same time has the effect of improving the response speed and suppressing the disturbance. [0003] However, in modern digital systems, the sampling speed can reach the millisecond level. Although the high sampling frequency improves the response speed, it may...

Claims

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Application Information

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IPC IPC(8): G05D23/19
Inventor 唐利峰石红瑞
Owner DONGHUA UNIV
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