SU585475A1 - Self-tuning speed control system - Google Patents

Description

one

This invention relates to self-adjusting systems that perform precise engine speed control over a wide range. The system can be used in automation devices, the production of which depends on the time of transient processes.

Self-adjusting control systems are known that contain a main control loop, a reference model whose input is connected to the system input, and an output to the input of an adder, the second input of which is connected to the system output through a dynamic link, and the output through the executive mechanism 2

As an executive mechanism, a device with an integral characteristic is most often used.

Of the known systems, the closest to the technical essence is a self-adjusting speed control system containing a pilot, which is connected via a moel of the object to the first input of the temporary adder and directly to

the first input of the second adder, the output of which through the control signal generator is connected to the input of the executive engine, the output of which through the speed sensor is connected to the second input of the first adder and the second input of the second adder, the third input of which is connected to the output of the integrator 3.

A disadvantage of the known system is low accuracy when changing the parameters of the control object and external disturbances acting on the control system.

The aim of the invention is to improve the accuracy and speed of the system.

This is achieved by the fact that the system has a relay, a third adder, an inverter and an inertia link, and the integrator's output through the inverter and the inertial link is directly connected to the corresponding inputs of the third adder, the output of which is connected to the third input of the third adder, the output of which is through the first adder and the relay is connected to the integrator input.

The drawing shows a block diagram.

It; wins the trigger 1, the first, the second and the third adder 2-4, the control signal generator 5, the executive motor 6, the speed sensor 7, the object model 8, the relay 9, the integrator 1O, the inverter 11, the inertial link 12.

The system works as follows. The input of model 8 receives a signal from the output of setpoint 1. The output signal of model 8 corresponds to the required control law, it algebraically combines with the feedback signal for speed in adder 2. The output signal of summatop 2 controls the operation of the three-position turnip 9.

8 according to the output signal of the relay

The integrator 10 generates a compensating effect that is applied to the input of the adder 3,

The principle of operation of the device is based on the following. If the control process in the system proceeds in accordance with the specified control law, the signals at the output of the model 8 and the speed sensor 7 are equal in magnitude and inverse in sign. In this case, the signal at the output of the adder 2 is missing, the output signal of the integrator 10 is zero. The self-tuning circuit does not affect the operation of the system.

Under the action of a perturbation or when the load on the actuator shaft 6 changes, a signal appears at the output of the adder 2, which triggers the relay 9. The integrator 10 converts the step signal from the output of the relay 9 into a linear compensating signal, which is summed in the adder 3 with signal

Control circuit.

The testing by the system of the compensating signal is performed with a lag due to the inertia of the entire system. Due to this inertia and the small dead zone of the relay 9, low-frequency oscillations occur in the system relative to the zero error line. To eliminate these oscillations, a correction node is provided, consisting of an adder 4, an inverter 11, and an inertia link 12.

The compressed signal from the output of the integrator 1 O and the output inertial level switch is supplied with anti-soiling signs to the input of the third adder 4, the signal from which is fed to the input of the relay 9 of the adder 2. When the signal is input from the output of the adder 4, the relay 9 turns off before the sum output signals of model 8 and speed sensor 7 will become zero.

A further decrease in the specified amount occurs when the relay 9 is turned off. The correction unit ensures the formation of a signal at the output of the integrator 10 of the required value at the minimum non-overshoot time.

The proposed system will increase the accuracy and speed of adjustment at least twice.

Claims (3)

1. Krasovsky A. A. Dynamics of continuous self-adjusting systems, M., Fizmatgia, 1963, p. 80-81. 2. USSR Author's Certificate No. 328433, G 05 B 17/02, 1972. 3. Sannovsky E. A. and others. Self-adjusting control systems with reference models, Minsk, 197O, p. 77-89. h