A method and device for approximating pure hysteresis

Abstract

The invention discloses a method and a device for approximating pure lag, comprising: performing six consecutive first-order inertia inverse operations on an input signal through a preset first-order inertia inverse operation formula; obtaining a first output signal and a second output signal , the sum of the third output signal, the fourth output signal, the fifth output signal and the sixth output signal; the fifth-order inertia operation is performed on the seventh output signal through the preset fifth-order inertia operation formula; the output signal of the subtraction operation is used as The ninth output signal, and perform four consecutive first-order inertia operations on the ninth output signal through the preset first-order inertia operation formula; obtain the tenth output signal, the eleventh output signal, the twelfth output signal and the tenth output signal The sum of the three output signals; the output signal of the subtraction operation is multiplied by a preset second constant of 0.8333 to obtain an approximate pure lag output signal. It solves the technical problem that only the first-order inertia link is used to approximate the pure lag, and the error of pure lag approximation is large.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a method and device for approximate pure hysteresis. Background technique [0002] In model-dependent control methods, such as PID plus Smith predictor control methods, it is necessary to identify accurate models of the plant including accurate pure-lag models. The main feature of the pure hysteresis model is that there is no output during the pure hysteresis period. An obvious negative effect of the pure hysteresis model is the jumping problem of the controller output. In some process control systems that have high requirements on the output control amount, it is a problem that needs to be dealt with. The problem. [0003] At present, one of the ways to solve the jump problem is to use only the first-order inertial link to approximate the pure lag, but there is a technical problem that the pure lag approximation error is large. Contents of the invention [0004] Th...

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Problems solved by technology

[0004] The invention provides a method and device for approximating pure hysteresis, which solves the technical problem that the pure hysteresis approximation error is relatively large by only using the first-order inertial link to approximate pure hysteresis

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