SU1004965A1 - Relay control device - Google Patents

Description

(54) RELAY CONTROL DEVICE

one

The invention relates to the automatic control and regulation of systems with variable parameters and can be used in relay control systems with slow processes and inertial objects in 5 | E influence of disturbances on them.

A control device is known that contains a three-position relay and is used in the case of a change in the parameters of the control object 1 J.

However, this device does not allow to obtain a high accuracy of the system, since it does not provide for the adjustment of the limiting level of the relay element.

The closest to the invention to the technical essence is a relay control device comprising a first relay, a first amplifier and a series-connected filter, a second amplifier, a switch, an integrator, a second relay and a logic unit, the output of which is connected to the control input of the switch, the second input is with the inputs of the first and second amplifiers, the output of the first amplifier is connected to the second input of the switch, the first input of the first relay is connected to the first input of the second relay, and the second input is connected to the second input of the second relay and move folder Pat2.

This device allows you to automatically adjust the size of the dead zone and the limit level of the relay element, which allows you to significantly increase the accuracy of the system.

15

However, when the value of the limiting level of the relay changes, either a significant overshoot may occur, due to the 1 sternness of the system elements, which can lead to

20 relays, or can occur during the transition process. Both in the first and in the second cases the quality of the regulated and the E system decreases. The purpose of the invention is to improve the dynamic characteristics of the relay rectifier device. This target achieves a Tew that a relay control device containing a first relay, a first amplifier and a filter connected in series, a second amplifier, a commutator, an integrator, a second relay and a logic unit whose output is connected to the control input of the switch, and the second input - with the inputs of the first and second amplifiers, the output of the first amplifier is connected to the second input of the switch, the first input of the first relay is connected to the first input of the second relay, and the second input is connected to the second INPUT of the second relay and to the input of the filter, the sequence Boundedly connected to a pause meter and a limiting level controller connected by an output to the third input of the first relay, an input of the pause meter is connected to the output of the first relay, an additional pulse period meter is added that is connected by the input and output to the input of the pause meter and the second input of the level regulator restrictions. The drawing shows a block diagram of the proposed device. The device includes the first relay 1, filter 2, first amplifier 3, second amplifier 4, switch 5, integrator b, logic unit 7, second relay 8, pause meter 9, limiter level regulator 10, pulse repetition meter 11. The input of filter 2 is connected to the second inputs of the first 1 and second 8 relays, and the output of the filter 2 is connected to a serially connected second amplifier 4 to a switch 5, an integrator 6, a second relay 8 and a logic unit 7, the output of which is connected to the control input of the switch 5, and the second input is with the inputs of the first 3 and second. 4 amplifier, the output of the first amplifier 3 is connected to the second input of the switch 5, the first input of the first relay 1 is connected to the first input of the second relay 8, the pause meter 9 and the limiting level controller 10, you od Ko torogo connected to the third input of the first relay 1, entry 9 pause meter connected to the output of the first switch 1, input output meter 11 II repetition period of the pulse signal are connected respectively to the input of the pause meter 9 and the second input of the regulator 10, the slice level. The relay control device operates as follows. The input signal, consisting of slow and fast varying components, is simultaneously applied to 2 and to relays 1 and 8, which have dead zones. The signal from the output of the first relay 1 goes to the main control loop. All other elements and communications of the device are used to ensure the automatic adjustment of the required deadband. Logic unit 7 analyzes, for a sign, the product of two signals applied to its input, and, depending on the sign of this product, switches the switch 5 to a particular position. In the event that the product is positive, the switch 5 is turned on so that the dead zone of the relay decreases, with a negative sign it increases. The dead zone is changed by the signal from the output of the integrator 6, to the input of which a slowly varying component of the input signal is fed through one of the amplifiers 3 or 4 depending on the state of the switch 5. Moreover, the absolute value of the gain of the amplifier that provides an increase in the dead zone , it is more, than the amplifier providing its reduction, and on a sign these coefficients are opposite. The change of the dead zone occurs in both relays 1 and 8, but its value for the second relay 8 is somewhat less than that of the first 1. This is necessary in order to prevent the two-pole mode in the main control loop. The pause meter 9 responds to a signal from the output of the first relay 1 and measures the amount of pause in the pulse signal at the output of relay 1, which corresponds to the value of the limit level of the relay. The signal from the output of the pause meter 9 is fed to the first input of the limiting level controller 1O, to the second input of which a signal is output from the meter 11 to the pulse period. The 10 level limit controller, which can be implemented as a digital calculator, changes this level according to an algorithm derived from the equality of the values of the displacement function (the average value over the period of a 1-pulse signal at the output of the first relay), with a constant external disturbance at the initial and final times T h –D – hc Here RON 0 | - respectively, the initial and final values of the bias function and the limiting level of the first relay; . T0 -J period of the following impulses of the signal, at the output, of the first relay; DTS - initial pause time; nd o - P is the counted value of the pause, ensuring the normal operation of the system. The value of D-Bd is chosen based on the inertia of the object of regulation, the rate of change of external disturbance of the rate of change of parameters of the object of regulation. The regulation time of the relay 1 limit from an arbitrary initial value to the final one, the corresponding pause length Lt, is equal to the transient process time. In this case, there is no overshoot and delaying of the control process, which results in a faster system performance, and subsequently Improves quality regulation.

Thus, the introduction of a meter for the period of the following signal pulses on O

2. USSR author's certificate No. 800961, cl. G, 05 V 11/16, 1981 (prototype). output of the first relay allows to improve the dynamic characteristics of the device.

Claims (1)

 Claims of the invention Relay control device comprising a first relay, a first amplifier and a filter connected in series, a second amplifier, a switch, an integrator, a second relay and a logic unit, the output of which is connected to the control input of the simulator, and the second input to the inputs of the first and BTopoixj amplifiers , the output of the amplifier is connected to the second input. switch house, the first input of the first relay is connected to the first input of the second relay, and the second input is connected to the second input of the second relay and to the filter input, a pause meter and a limit level control connected in series to the third input of the first one. The relay, the pause meter input is connected to the output of the first relay, characterized in that, in order to improve the dynamic characteristics of the device, it contains a pulse period meter, connected by the input and output, respectively, to the pause meter input and to the second controller input level “bordering. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 622О45, cl. Ci 05 B 11/13, 1977.