SU498405A1 - Device for automatic control of engine speed - Google Patents

Description

one

FIELD: engine building.

Devices are known for automatically controlling the rotational speed of a ship's engine, comprising a control channel and a speed sensor connected via a control unit to a command mechanism.

However, in known devices, automatic passage of the critical engine speed zone is not provided.

The aim of the invention is to eliminate the static operation of the engine in the critical speed zones.

To achieve this goal, a switch is connected to the control unit, which is connected with inputs of a speed sensor and a proportional-integral controller output, and outputs with last and accumulator inputs, other inputs of which are connected to the controller output, and with several control channels, and exit - with the command mechanism.

In addition, a multiplying-dividing cell is connected to the control unit, connected by inputs to the switch and equalizer outputs, and output to the equalizer input, the other inputs of which are connected to one of the outputs of the adder and the control channel, and the output to one of the switch inputs .

FIG. 1 shows the block diagram of the device

for a motor with full speed control; in fig. 2 - also for an engine without an all-mode regulator.

The proportional-integral controller 1 generates a regulating action based on the deviation of the controlled parameter from a predetermined value. The adder 2 serves for the algebraic summation of the command signal Ru for controlling the engine speed and the output signal of the proportional-integral controller 1 at the moment when the engine speed reaches the boundary points of the critical-speed zone. One input of the adder is connected to the control channel, and the output is connected to a command mechanism (not shown in the drawings). Switch 3 generates reference discrete signals corresponding to engine revolutions at the boundaries of the zone of critical speeds, and is connected to the input with the sensor

rotational speeds 4. The multiplication-dividing cell 5 serves to form the standard range of the current value of the engine torque corresponding to the upper (lower) boundary of the critical speed zone.

The corrector 6 is designed to form the current setpoint value of the switch 3.

At the time of the engine speed, which has an all-speed regulator, on

the lower point of the forbidden zone at the output of the regulator 1 appears the error signal. The command signal RC generated at the output of adder 2 is the algebraic sum of the signal Ru coming from the control channel and the error signal at the output of regulator 1. As a result, engine speed is kept at the lower boundary of the forbidden zone. With increasing signal Ru engine speed also begin to grow; at the same time, the error signal at the output of the regulator 1 grows. As a result of the correction, the command signal at the output of the adder 2 decreases and becomes equal to the command corresponding to the revolutions of the lower limit of the forbidden zone.

When the error signal at the output of the regulator 1 is equal to the width of the forbidden zone of critical speed, a signal arrives at the input of the adder 2 from the output of the switch 3, resulting in a sharp jump in the command signal at the output of the adder 2. Engine speed grows rapidly, mine a forbidden zone. With the passage of the upper boundary of the exclusion zone, the switch 3 generates a signal necessary to change the sign of the regulating action.

If there is no all-speed regulator, the engine is controlled directly through the body acting on the flow of the working medium.

In this case, the value of the command signals at the output of the adder 2 determines not the engine speed, but only the supply of the working medium. In order to take into account the change in the power consumption characteristics by the load and thereby exclude the operation of the engine in the forbidden zone of revolutions, the setpoint by which the correction signal is removed from the command signal is automatically shifted depending on the change in the damping factor of the screw characteristic. To do this, multiply the cell 5 multiplies the signals corresponding to the current engine torque at the lower point of the forbidden zone and the engine torque at the upper point of the forbidden zone according to the nominal screw characteristic, and then dividing the received signal by the torque value the lowest point of the forbidden zone on the nominal screw characteristic. The resulting signal corresponds to the estimated value of the engine torque when operating according to the current screw characteristic.

Claims (2)

1. A device for automatically controlling the speed of a ship's engine, comprising a control channel and a speed sensor, connected via a control unit with a command mechanism, characterized in that, in order to eliminate static engine operation in critical zones turns, a switch connected to the inputs with the speed sensor and with the output of the proportional-integral controller was entered into the control unit, and the outputs with the inputs of the last and totalizer, other inputs which are associated with the output of the controller and the control channel, and the output - with the command mechanism. 2. The device according to claim 1, characterized in that a multiplexing cell is inserted into the control unit, connected by inputs to the switch and equalizer outputs, and the output is to the equalizer input, the other inputs of which are connected to one of the outputs of the adder and the control channel , and the output - with one of the inputs of the switch. R fui 2