SU703774A1 - Control system - Google Patents

Description

I

The invention relates to general purpose automatic control systems used in various industries (energy, chemical, metallurgical) in the automation of objects controlled by one parameter with the help of two regulators.

Automatic control systems are known that implement a method for the combined control of one parameter through two control channels. These systems have in the auxiliary channel an astatic regulator with a variable dead band, to the input of which the output signal of the regulator in the main control channel l and 2 is supplied,

However, such systems do not provide the necessary control accuracy in the case when both controllers are astatic, and the regulator of the main (exact) control channel has a limited range of variation of the controlled parameter.

The prototype of the invention is a system for automatically regulating one parameter using two actuators, comprising a series-connected feedback sensor, an error signal generation unit, an error regulating error regulator, a first power amplifier, a first reversing actuator and a first actuator, as well as serially connected second power amplification, second reversing actuator and second executive organ Z.

However, such a regulator acts on the auxiliary mechanism only after the main actuator reaches an extreme position, which degrades the speed of the regulator, its accuracy and stability;

Claims (3)

The aim of the invention is to develop an automatic control system of one parameter with the help of two regulators, providing high speed, accuracy of control and stability. This is achieved by introducing two keys, two elements, OR, NOT and the signal generating unit of the installation of the executive body, whose input is connected to the corresponding output of the second reversing actuator, and move to the first input of the second switch. The second input of the latter is connected to the output of the control error regulator, and the output to the first input of the OR element, whose output is connected to the input of the second power amplifier, and the second input to the output of the first key, the first input of the first key connected to the output of the signal conditioning unit errors, and the second input through the element is NOT - with the output of the discriminator error control. The drawing shows a control system and the following notation is adopted: 1 — feedback sensor, 2 error signal generation unit, 3 and 4 — reversible actuators, 5 — regulator of control error, 6 and 7 — power amplifiers 8 and 9 — executive elements , 1O logical element OR, 11 - block forming the installation signal of the executive body (to the middle position), 12 and 13 - keys, 14 - logical element NOT, IS - object. The system works as follows. If the controlled parameter of the object 15, measured by the feedback sensor 1, corresponds to the specified value: With an accuracy of the magnitude of the dead zone of the error signaling unit 2, then the output last syyyyl is absent and the control bodies 8 and 9 are stationary. If the value of the adjustable parameter of the object goes beyond the boundaries of the zone, the insensitivity of the error signal generation unit, then an output error signal appears at its output, functionally dependent on the sign and magnitude of the error, as well as the derivative of the adjustable parameter. If the magnitude of the control error Ye ° exceeds the dead band of the error discriminator 5, defined by the upper and lower limits n jmixf rijaw, the values of k: 0txx are selected for specific conditions, there is no signal at the output of the discriminator error. At the same time, there is no signal at the input and output of the power amplifier b, the reversing actuator 3 is stationary, the key, 13 is closed, the key 12 is opened with the output signal of the HE element 14, and through it and the OR element 10 the signal from the output of the error signal generation unit goes to the input of power amplifier 7, from the output of which it is fed to the reversible one; The first mechanism 4. Last. The position of the authority 9, changes the regulation error to zero. If the magnitude of the regulation error exceeds the dead zone of the discriminator error 5, the output of the latter. Is a relay control signal, which is fed through the power amplifier 6 to the reversing actuator 4. The last, modified position of the actuator 8, reduces the regulation error . In this case, the signal from the output of the error discriminator closes the key 13 through the logical element NOT 14, opens the key 13, then the reversing actuator H controlled through the public key 13, the logical element OR 10 and the power amplifier 7 from the unit 11 generating the actuator's signal in the middle position, settling the latter in the middle of). After the control error becomes less than the dead band of the discriminator error 5, the system works as described above for the case when the magnitude of the control error does not exceed the dead band of the dis-. criminator error. The use of such a system allows to significantly improve the speed, accuracy and stability of controlling one parameter with the help of two-executive bodies. Claims of the regulation system, containing & serially connected feedback sensor, error signal generating unit, control error discriminator, first power amplifier, first reversing actuator, 570 engine and first actuator, and consecutively connecting terminals. Second power amplifier, reversing actuator and a second executive body, distinguished by the fact that, for the purpose of promotion. system speed and accuracy; it additionally contains two keys, EL (Vmenty OR, NOT and a signal generating unit for the installation of the executive body, the input of which is connected to the corresponding output of the second reversing actuator, and the output - to the first input of the second key, the second input of which is connected to the error regulator and the output is to the first input of the OR element, the output of which is connected to the input of the second power amplifier, and the second input to the output of the first, the first input of which is connected to the output of the error signal generation unit and, the second input through the logical email, NOT my moit - from the discriminator output of the regulation error. Sources of information taken in jsHJiMaHHe during examination 1. Modern methods of designing automatic control systems edited by B. I. Petrova, V, V, Solodovnikova, Yu. I. Tolgeeva, M., Mechanical Engineering, 1967. 2. The author's certificate of the USSR N9 189474, cl. Q05 B 11 / GS, 1965. 3. USSR author's certificate No. 468219, cl. G05 B 11 / OO, 1973 (prototype).