JP2509427Y2 - Main engine rotation speed control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rotation speed control device for a marine main engine, and more particularly to a means for holding an actuator position when the marine main engine is stopped.

[Conventional technology]

2. Description of the Related Art Conventionally, as a rotation speed control device for a marine main engine, there is one shown in FIG. The rotation speed control device 1 outputs an actuator position command f1 to the actuator 4 in a direction in which both the rotation speed setting signal n2 from the main engine remote controller 2 and the actual rotation speed signal n1 of the engine E are applied to reduce the deviation between them. The PID controller P is a main component.

In this rotation speed control device 1, the rotation speed setting signal n2 of the main machine remote controller 2 is transmitted to the PID controller P via the memory 5, and this memory 5 stores the value of the rotation speed setting signal n2. Constant value [Value slightly lower than the value equivalent to the minimum speed of the main engine remote controller 2. ] The disconnection detector 6 which outputs a signal in the following cases
Signal, the value of the rotation speed setting signal n2 is stored when the main engine remote controller 2 is disconnected during navigation or berthing. Therefore, this rotation speed control device 1 operates on the basis of the rotation speed setting signal n2 even if the main remote controller 2 is powered off.
The actuator position command f1 is applied to and the engine speed is maintained. By the way, the main machine remote controller 2 while it is at berth does not completely set the value of the rotation speed setting signal n2 to 0 so that the model of the rotation speed control device 1 can also correspond to the mechanical-hydraulic type, but outputs a value equivalent to the slow speed. It is like this. Machine-
The rotation speed setting signal of the hydraulic rotation speed control device uses air pressure, but the main machine remote control is an electric signal. The rotation speed setting signal is converted into air pressure by using an electric-air converter and given to the rotation speed control device. However, since the response of the electric-air converter is slow, it takes time for the pressure to rise to the air pressure corresponding to the slow speed even if the electric speed setting electric signal to the electric-air converter is slowed from 0 rpm to start the main engine. Since the startability is deteriorated, a method is adopted in which the rotation speed setting signal n2 is set to a slow value at which the main engine does not start when the main engine is stopped while moored.

However, when the main engine is inspected during the berth, it is necessary to return the position of the actuator 4 to 0. Therefore, the main remote controller 2 includes a switch S3 for transmitting a stop signal f2 for stopping the engine E. When this stop signal f2 is applied to the rotation speed control device 1, the switch S1 connects the actuator 4 to the actuator 0 signal transmitter 3. At the same time, the stop signal f2 is also applied to the PID controller P to stop its operation.

[Problems to be solved by the device]

As described above, in the conventional technique, when the stop signal f2 is output during the inspection of the main engine while moored, the rotation speed setting signal n2
Is not 0 but a signal equivalent to slow. The stop signal f2 is also applied to the PID controller P to stop the function of the PID controller P as well.

In the case of a large ship, the main engine remote control 2 and the rotation speed control device 1
Since they are installed apart from each other, the power of the main engine remote controller 2 may be turned off while the stop signal f2 is being output from the main engine emocon 2. In this case, the stop signal
Since f2 disappears and the switch S1 returns to the PID controller P side, the stop function of the PID controller P is released at the same time.
The ID controller P applies the actuator position command f1 to the actuator 4 based on the output of the memory 5, the actual rotation speed signal n1 and the deviation. Therefore, the actuator 4 rapidly moves from the actuator 0 position where the air pressure of the actuator 4 is released to a position corresponding to a slow speed at which the main engine does not start. That is, the positions of the FO rack and the FO pump connected to the actuator 4 also change. Normally, in such a state, the engine E is stopped and the actuator 4, F.
O. This occurs when inspecting the rack or FO pump, and there is a problem that the inspection worker is exposed to danger.

 The present invention solves the above problems.

[Means for solving the problem]

A PID controller that outputs an actuator position command based on the rotation speed setting signal and the actual rotation speed, and a rotation speed setting signal that is provided on the input side of this PID controller and that exceeds the rotation speed 0 signal before disconnection of the main unit remote controller is stored. A memory for outputting and an output side of the PID controller, which switches from the output of the PID controller to the actuator zero signal by a stop signal.
And a switch for switching the signal line of the rotational speed setting signal to which the rotational speed 0 signal transmitter and the disconnection detector are connected, on the input side of the memory. The switch is switched to the rotation speed 0 signal transmitter side by the stop signal, and the signal stored in the memory is replaced with the rotation speed 0 signal.

[Action]

According to the above-mentioned means of the present invention, since the input terminal of the memory of the rotation speed control device is connected to the rotation speed 0 signal transmitter which outputs the rotation speed 0 signal corresponding to the actuator 0 signal by the stop signal, the main machine remote controller When the power supply of No. 2 is turned off, the signal of the rotational speed 0 is stored as the output signal of the disconnection detector. Also, when the power supply of the main machine remote control is turned off, the stop signal disappears, and the function of the PID controller is restored. However, both signals become 0 on the input side, so a rotation speed 0 signal is applied to the actuator. To do. Therefore, it is possible to avoid the sudden protrusion of the actuator.

〔Example〕

An embodiment of the present invention will be described with reference to FIG. In the description, the same parts as those in the conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 1, a switch S2 which is operated by a stop signal f2 is provided on the input side of the memory 5 of the rotation speed control device 1A. The switch S2 switches the memory 5 from the signal line N2 'of the rotation speed setting signal n2 to the rotation speed 0 signal transmitter 8. The disconnection detector 6 is a signal line.
It is connected to N2 '. Therefore, when the power source of the main machine remote controller 2 is turned off, a storage command is sent to the memory 5.

When the stop signal f2 is not present, the switch S2 is provided with the signal line N2 ′.
Is connected to the memory 5, and the memory 5 is connected to the rotation speed 0 signal transmitter 8 by the stop signal f2. Therefore, when the stop signal f2 is transmitted by operating the switch S3, the rotation speed 0 signal of the rotation speed 0 signal transmitter 8 is applied to the memory 5. A PID controller P and a comparator 10 are connected to the output side of the memory 5. This comparator 10 has a minimum control level speed and 0
Comparator 10 sets the set value that is set to a predetermined value between rotation speeds.
The setting device 9 for applying the voltage is connected. When the output of the memory 5 is smaller than the set value of the setter 9, the comparator 10 outputs an ON signal to the OR element OR1 [hereinafter, the ON signal is referred to as “1” and the OFF signal is referred to as “0”]. ] Is applied. On the input side of OR1 of this OR element,
The signal line F2 'of the stop contact signal f2 is connected to the output side of the comparator 10 described above, and the output side thereof is connected to the switch S1. When either the stop signal f2 or the output of the comparator 10 is "1", the switch S1 is switched from the PID controller P to the actuator 0 signal transmitter 3 side. Accordingly, the actuator 4 signal is applied to the actuator 4 by the stop signal f2 or the output of the comparator 10.

 Next, the operation of this embodiment will be described.

The switch S3 of the main unit remote controller 2 is operated, and the signal line F2 '
When "1" of the stop signal f2 is applied to the memory 5, the memory 5 is connected to the 0-speed signal transmitter 8, the operation of the PID controller P is stopped, and the switch S1 is operated via the OR element ORI. Then, the actuator 0 signal transmitter 3 and the actuator 4 are connected. Therefore, the position of the actuator 4 is
It is at the 0 position.

When the power source of the main machine remote controller 2 is lost in this state, the stop signal f2 also becomes "0" and the rotation speed setting signal n2 also falls to the detection level of the disconnection detector 6. This disconnection detector 6
Applies a command to the memory 5 to store the number of revolutions immediately before the disconnection. Therefore, the memory 5 is a 0-speed signal transmitter 8
The rotation speed 0, which is the output of, is stored.

The output of the memory 5 is applied to the PID controller P and the comparator 10. If the actual rotation speed signal n1 is certainly held at a value of 0, the PID controller P also sets the command value from the memory 5 to 0.
Therefore, the deviation becomes 0 and a 0 signal is transmitted to the output side. Therefore, in this case, the actuator 4 does not operate even if the switch S1 is switched.

However, the detector 7 generates an erroneous signal, and the rotational speed 0 signal of the memory 5 is applied to one side of the PID controller P and the actual rotational speed signal n1 due to the erroneous signal of the detector 7 is applied to the other side. Then, the actuator position command f1 for setting the deviation value of the signal applied to the input side to 0 is output to the output side of the PID controller P. However, the comparator 10 compares the output of the memory 5 with the output of the setter 9 and transmits a signal of "1" to the output side to maintain the state in which the actuator 4 is connected to the actuator 0 signal transmitter 3. Therefore, the operation stop state of the actuator 4 can be maintained regardless of the operation of the PID controller P.

Since the setter 9 and the comparator 10 have the above-mentioned functions, they are unnecessary if the detector 7 surely sets the actual rotation speed signal n1 to 0 when the engine E is stopped.

[Effect of device]

When inspecting the main engine of a ship at berth, in response to an unexpected power failure of the main engine remote controller while the stop signal of the main engine remote controller is being output, a rotation speed 0 signal corresponding to the actuator 0 signal is output to the PID controller. Since the rotation speed control device for the marine main engine having the configuration is used, the actuator 4 can be used when inspecting the actuator 4, the FO rack, and the FO pump.
There is no danger that inspection workers will be exposed to danger.

[Brief description of drawings]

FIG. 1 shows a block diagram of the present invention, and FIG. 2 shows a conventional block diagram. n1 …… actual rotation speed signal n2 …… rotation speed setting signal f1 …… actuator position command f2 …… stop signal S1 / S2 / S3 …… switch N2 ′ …… signal line 1A / 1 …… rotation speed control device 2 ... … Main machine remote control 3 …… Actuator 0 signal transmitter 4 …… Actuator 5 …… Memory 6 …… Disconnection detector 8 …… Rotation speed 0 signal transmitter

Claims (1)

(57) [Scope of utility model registration request] 1. An actuator position command f1 is output from a rotation speed setting signal n2 from the main machine remote controller 2 and an actual rotation speed n1.
The PID controller P and the main unit remote controller 2 provided on the input side of the PID controller P
Of the PID controller P, which is provided on the output side of the PID controller P and has a memory 5 for storing a revolution number setting signal exceeding the revolution number 0 signal before the power supply of the PID controller P is stopped. In the rotation speed control device of the marine main engine, which is provided with the switch S1 for switching from the actuator to the actuator zero signal, the rotation speed setting signal which is provided on the input side of the memory 5 and which connects the rotation speed 0 signal transmitter 8 and the disconnection detector 6 A switch S2 for switching the signal line N2 'of n2 is provided, and this switch S2 is switched to the rotation speed 0 signal transmitter 8 side by the stop signal f2 to replace the signal stored in the memory 5 with the rotation speed 0 signal. A rotation speed control device for a marine main engine, which is characterized in that