CN205594335U - Developments assignment PID heating control system suitable for high vacuum environment - Google Patents

Abstract

The utility model discloses a developments assignment PID heating control system suitable for high vacuum environment relates to the process control field of material heating under the high vacuum environment, and it is that the overshoot high temperature problem of heating process provides under the high vacuum environment in order to solve. Having increased dynamic assignment operation ware in traditional PID heating control system, having realized a lot of of PID controller, dynamic assignment, according to the feedback temperature of current status and the target temperature value of settlement, the middle target temperature value of composing is reach by the assignment operation formula computing. The assignment temperature that changes makes PID controller parameter make adjustment rapidly according to target temperature in the middle of dynamic, in time adjusts heating power, and when the feedback temperature was close the heating target temperature who sets for, reduction heating power that can be timely, quick stopped even heating, make full use of under the vacuum environment calorescence of object, reduced the overshoot temperature of heating control process by a wide margin.

Description

It is applicable to the dynamic assignment PID heating control system of high vacuum environment

Technical field

This utility model relates to the process control technology field of object heating under high vacuum environment.

Background technology

Along with proportional-integral-differential (Proportion-Integration-Differentiation, PID) controls reason The appearance of opinion, PID controller based on various algorithms are widely used in many industries, particularly control neck in temperature Territory, the heating controller of 90% is designed based on PID principle.

Traditional PID heating control system is as it is shown in figure 1, its operation principle is basistThe feedback temperature of moment heating target Degree, wants to compare with given target temperature, using current temperature error values as the input of PID controllere(t), by ratio system Numberkp, integration time constantTI；Derivative time constantTD.Obtain the output of PID controlleru(t)

, (1)

The output of PID controlleru(t) control power governor output, change heater heating power, make to add The temperature of heat target raises, and the feedback temperature value of controller changes, and temperature error values constantly diminishes, until it reaches preset Target temperature.

Generally, for preventing the high-temperature oxydation phenomenon occurred under atmospheric environment, the hot test of material must be in fine vacuum Carry out under protection environment.Although, the introducing of the control principles such as fuzzy theory, neutral net, ROBUST THEORY, emerge a lot of improvement Pid control algorithm, to adapt to the complexity of heating process, meet the computer heating control under some special environment.But, fine vacuum Under environment, the thermal inertia of object is big, Changing Pattern is complicated, and too high temperature overshoot often occurs in traditional PID control method, holds The structure of destructible test material and performance.

Utility model content

The too high overshoot temperature produced for heating process under suppression high vacuum environment, the utility model proposes a kind of dynamic The PID heating control system of assignment, its control principle is according to the temperature between Current Temperatures value of feedback and target heating temperature value It is poor to spend, the dynamic PID temperature controller assignment temperature that changes, and then controls heater power, completes heating target heating process PID controls.

For achieving the above object, this utility model adopts the following technical scheme that, heating control system bag of the present utility model Including PID controller, power governor, heater, heating target and temperature survey part, PID controller passes through power governor control The heating power of heater processed, heater directly carries out heat treated to heating target, and heating target is provided with temperature survey part, Its structural feature is: also including dynamic assignment operation device, pre-set target temperature value in dynamic assignment operation device, temperature survey part will The feedback temperature value of heating target feeds back in dynamic assignment operation device, and dynamic assignment operation device is assigned to after calculation process PID controller.

Method for heating and controlling of the present utility model is: target temperature value first inputs to dynamic assignment operation device, by dynamically composing Value arithmetic device calculates intermediate objective temperature value according to the feedback temperature value of current heating target, then is assigned to PID control dynamically Device processed, PID controller is reconciled the output of power governor according to the intermediate objective temperature value of dynamically change, is changed heater Heating power, make the temperature of heating target raise, the feedback temperature value that dynamic assignment operation device receives changes, temperature Error amount constantly diminishes, until it reaches the target temperature preset.

Preferably, in heating process dynamic assignment operation device PID controller is carried out repeatedly, dynamic intermediate objective temperature value Assignment.

Preferably, along with the continuous rising of heating target temperature, the temperature between feedback temperature value and target temperature value Difference is less than 1 DEG C, and the intermediate objective temperature value of dynamic assignment operation device output is equal to target temperature value, dynamic assignment operation device work Work stops, PID controller by the temperature stabilization of heating target in the temperature of target temperature value.

Preferably, if by the feedback temperature value of current heating target as the input of dynamic assignment operation deviceT _i, target adds Hot temperatureT _S, then intermediate objective temperature value is by the assignment operation formula in dynamic assignment operation device It is calculated, in formulaNFor the assignment number of times of dynamic assignment operation device,N=0,1,2……。

This utility model beneficial effect:

Different from traditional PID method for heating and controlling, this utility model adds dynamic assignment in heating control system Arithmetical unit, it is achieved that to PID controller repeatedly, dynamic assignment, according to feedback temperature and the target of setting of current state Temperature value, the intermediate objective temperature value composed is calculated by assignment operation formula, and the assignment temperature of change promotes PID controller Parameter is made adjustment rapidly according to dynamic intermediate objective temperature value, is adjusted heating power in time, when feedback temperature connects During the heating target temperature closely set, it is possible in time, quickly reduce heating power, even stop heating, take full advantage of true The thermal inertia of object under Altitude, significantly reduces the overshoot temperature of computer heating control process.

Accompanying drawing explanation

Fig. 1 is prior art PID heating control system figure；

Fig. 2 is dynamic assignment PID heating control system figure of the present utility model；

1-target temperature value, 2-dynamic assignment operation device, 3-PID controller, 4-power governor, 5-heater, 6-adds Heat target, 7-temperature survey part.

Detailed description of the invention

The 2 pairs of this utility model do further technology and describe below in conjunction with the accompanying drawings:

As in figure 2 it is shown, this utility model includes PID controller 3, power governor 4, heater 5, heating target 6 and temperature Degree measuring piece 7, PID controller 3 controls the heating power of heater 5 by power governor 4, and heater 5 is directly right to heating As 6 carry out heat treated, heating target 6 is provided with temperature survey part 7, also includes dynamic assignment operation device 2, dynamic assignment operation Pre-set target temperature value 1 in device 2, the feedback temperature value of heating target 6 is fed back to dynamic assignment operation device 2 by temperature survey part 7 In, dynamic assignment operation device 2 is assigned to PID controller 3 after calculation process.

This utility model is currently heated the feedback temperature value of object by reading, and by itself and the target temperature value set Compare, when feedback temperature value is less than target temperature value, then dynamically assignment operation device starts.

Dynamically the operation principle of assignment operation device is as follows: the feedback temperature setting current heated object is transported as dynamic assignment Calculate the input of deviceT _i, according to target heating temperatureT _S, then the output of dynamic assignment operation deviceT _i+1For:

, (2)

In formulaNFor the assignment number of times of dynamic assignment operation device,N=0,1,2……。

Assignment operation formula (2) calculatesT _i+1As intermediate objective temperature value input to PID controller, regulation heating The heating power of object；Along with the rising of heating target temperature, constantly measure its feedback temperature, work as feedback temperatureT _FnEqual to current Intermediate objective temperature under stateT _i+1, enter into dynamic assignment procedure next time.

Along with assignment number of timesiIncrease, the temperature of heating target is stepped up, with heating target temperature move closer to, The delta temperature value of intermediate objective temperature value is increasingly bordering on 0, when feedback temperature value is equal to target temperature value, then dynamically assignment is transported Calculation device quits work, and now, the assignment temperature of PID controller is the target temperature value of heating.

The dynamic assignment PID heating means that the utility model proposes, by the repeatedly dynamic assignment to PID controller, promote In PID controller, PID regulation parameter is made adjustment rapidly according to the intermediate objective temperature of dynamically change, adds heater in time Thermal power is adjusted, when feedback temperature value is close to the target temperature value set, it is possible in time, quickly reduces and adds hot merit Rate, even stops heating, takes full advantage of the thermal inertia of object under vacuum environment, make heating target progressively reach target setting and add Hot temperature, effectively prevent too high temperature overshoot.

This utility model is not limited to above-mentioned preferred embodiment, every have with this utility model same or like seemingly Technical scheme, belong to protection domain of the present utility model.

Claims (1)

1. it is applicable to the dynamic assignment PID heating control system of high vacuum environment, including PID controller, power governor, heating Device, heating target and temperature survey part, PID controller controls the heating power of heater by power governor, and heater is straight Connecing and heating target is carried out heat treated, heating target is provided with temperature survey part, it is characterised in that: also include that dynamic assignment is transported Calculating device, pre-set target temperature value in dynamic assignment operation device, the feedback temperature value of heating target is fed back to dynamic by temperature survey part State assignment operation device, dynamic assignment operation device is assigned to PID controller after calculation process.