JPS6228804A - Proportional integration device - Google Patents

Abstract

PURPOSE:To obtain an optimum response by changing a reference signal to be inputted to a proportional integrator as a function of a deviation between an objective value and a feedback value. CONSTITUTION:A deviation 11 between a reference input signal 2 and a feedback signal 3 is calculated by an adder/subtractor 10 at first. The deviation 11 is compared with a prescribed value by a comparator 12, and when the deviation 11 exceeds the prescribed value, the reference signal 2 is multiplied by the contents of a gain 9 through a multiplier 8 during a fixed period (during a time constant) based on a timer 13. Namely, even if a fine reference input signal is applied, the signal is multiplied by the gain during the time constant, so that response performance in a transient area where a control operation signal 5 is increased can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a proportional integral device that performs proportional integral operation at high speed by determining input to a proportional integrator from the amount of deviation between a target value and a current value. It is something.

[Conventional technology]

As a conventional proportional-integral device of this type, there is known a proportional-integral device shown in FIG. 3 which performs control only from the amount of deviation between a target value and a current value.

In the figure, 1 is an adder/subtractor that calculates the deviation between the reference signal 2 and the foot signal 3, and 4 is a proportional integral that inputs the control operation signal 5 obtained from this calculation result and outputs the control output signal 6. In the case of a proportional element, this controlled variable is
The gain is multiplied by a constant gain, and in the case of an integral element, it is integrated at a rate of change depending on the time constant. A feedback element 7 converts the manually controlled control amount 6 into a feedback signal 3 and outputs it to the adder/subtractor 1. In the conventional proportional integration device having such a configuration, the deviation amount between the reference signal 2 set for the controlled object and the feedback signal 3 is outputted as the control output signal 6 by the proportional integrator 4.

[Problem that the invention seeks to solve]

Conventional proportional-integral devices are configured as described above, so in a control system with a slow response, if the amount of deviation between the target value and feedback is small, the response will be slower, and since the parameters are constant, There was a problem in that it was impossible to fully satisfy the responsiveness of the control system.

The present invention has been made to solve the above-mentioned problems, and is a proportional-integral device that changes the amount of deviation between the target value and the feedback value in accordance with the change in the target value, and increases the response of the control system. Get t! J! With the goal.

[Means for solving problems]

The proportional integrator according to the present invention is capable of obtaining an optimal response by changing the reference signal to the proportional integrator as a function of the amount of deviation between the total target value and the feedback value.

[For production]

Even if the target value changes, the proportional integral device in this invention
Since the amount of deviation is changed in accordance with the change, an optimal response can be obtained.

[Example of Reikoji Temple]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 8 is a multiplier that multiplies the reference signal 2 by a gain of 9;
10 is an adder/subtractor that calculates the deviation 11 between the reference signal 2 and the feedback value 3, 12 is a comparator that detects a change in the deviation 11 between the reference signal and the feedback value, and 13 is the time to multiply the total gain of the reference signal by 9. It is a timer that determines.

Next, the operation will be explained. First, the adder/subtractor 10 calculates the deviation 11 between the reference input signal 2 and the feedback signal 3. This deviation is compared with a predetermined value by the comparator 12, and when it becomes larger than the predetermined value, the timer 13 causes the multiplier 8 to multiply the reference signal 2 by the gain 9 for a certain period (during the time constant). . In other words, even a very small reference input signal is multiplied by the gain during the time constant, so that the response in a transient region where the control operation signal 5 is large can be improved.

FIG. 2 shows the initial response of a direct-coupled feedback system including proportional-integral elements. In the figure, the feedback signal in the prior art is shown by characteristic A, and from this characteristic A, the response of characteristic B is the feedback signal in the present invention. This shows that the target value is reached more quickly in the case of gender. Characteristic B approaches the target value of l×α, but after a time constant time, the target value changes from 1×α to 1 as shown by u(t) in the figure, so characteristic C It is possible to reach the target faster than characteristic A by canceling out the feedback value.

In addition, although the case of a proportional-integral apparatus was shown in the said Example, the other controlled apparatus which uses normal proportional-integral control may be used, and the same effect as the said Example will be produced.

〔Effect of the invention〕

As described above, according to the present invention, since the reference signal to the proportional integrator is configured to change as a function of the amount of deviation between the target value and the feedback value, the responsiveness of the control system can be improved. There is.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an integrating device showing an embodiment of the present invention, Fig. 2 is a characteristic diagram showing a comparison of the initial responses of a conventional device and a device of the present invention, and Fig. 3 is a diagram showing the configuration of the conventional device. FIG. In the figure, 1 is an adder/subtractor, 2 is a reference signal, 3 is a feedback signal, 4 is a proportional integrator, 5 is a control operation signal, and 6 is a control amount signal. Note that the same reference numerals in each figure indicate the same or corresponding parts. Patent applicant Mitsubishi Oki Co., Ltd. Agent Patent attorney 1) 1 Hiroshiaki (2 others)

Claims (1)

[Claims] A proportional controller equipped with an adder/subtractor that calculates the amount of deviation from a reference signal for the controlled object and a feedback signal indicating the current value, and a proportional integrator that outputs a control output signal based on the control operation signal obtained from the calculation result of the adder/subtractor. What is claimed is: 1. A proportional integration device comprising a feed forward function for determining an optimal reference signal by changing the amount of deviation in accordance with a change in a target value.