Adaptive PID (proportion integration differentiation) control method, chip and unit

Abstract

The invention discloses an adaptive PID (proportion integration differentiation) control method, chip and unit. The method includes the steps of A, acquiring T(z<-1>); B, according to T(z<-1>), y(k), y(k-d) and u(k-d), acquiring B(z<-1>)G(z<-1>) and B(z<-1>)H(z<-1>) according to an equation: T(z<-1>)y(k)=B(z<-1>)G(z<-1>)y(k-d)+B(z<-1>)H(z<-1>)u(k-d); C, according to the B(z<-1>)G(z<-1>), B(z<-1>)H(z<-1>), w(k) and y(k), determining an output value u(k) of the unit according to an equation: B(z<-1>)H(z<-1>)u(k)= B(z<-1>)H(z<-1>)w(k)- B(z<-1>)G(z<-1>)y(k). The adaptive PID control method, chip and unit has the advantages that solving Diophantine equations is avoided, data acquisition and parameter recognition are required only, the unit needs less calculation, operating efficiency is improved, hardware cost is lowered, the adaptive PID control method, chip and unit is suitable for the situation that the Diophantine equations have no solution, and the adaptive PID control method, chip and unit is widely applicable and highly reliable.

Description

technical field [0001] The invention belongs to the field of industrial process control, in particular to an adaptive PID control method, a control chip and a controller. Background technique [0002] In chemical, metallurgical and other industrial processes, changes in the environment and wear of process equipment can cause large changes in process parameters. Compared with the traditional classic PID control method, the adaptive PID control method can recognize changes in environmental conditions and According to a certain optimal performance, the control parameters are automatically adjusted, so it has been paid attention to in engineering applications, and has been widely used in variable control such as temperature, flow, liquid level, and pressure. [0003] The controlled object is described locally by a second-order system approximately linearly, and the following is obtained: figure 1 The block diagram of the adaptive PID control system is shown. Among them, w(k) r...

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Problems solved by technology

[0010] The disadvantage of this method is that, since T(z -1 ), A(z -1 ) and B(z -1 ), according to T(z -1 )=A(z -1 )H(z -1 )+z -d B(z -1 )G(z -1 ) to get G(z -1 ) and H(z -1 ), at this time the equation T(z -1 )=A(z -1 )H(z -1 )+z -d B(z -1 )G(z -1 ) is a Diophantine equation, and the solution of the Diophantine equation is complicated, the amount of calculation is large, and the online calculation is difficult, which leads to the low efficiency of the controller; and in some cases, the Diophantine equation cannot be solved, which leads to the controller Ineffective, unable to achieve the expected control effect

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