JPS60146795A - Propulsion system controller for vessel - Google Patents

Abstract

PURPOSE:To keep the revolution speed of a main engine to a desired value by automatically controlling the pitch of a variable-pitch propeller without using a constant-speed governor. CONSTITUTION:The revolution speed N of a Diesel engine 11 as the main engine for a vessel is detected by a detection part 12 and transmitted into a controller 13. Said controller 13 compares the value N with an aimed revolution speed Ns and controls the pitch of a variable-pitch propeller 15 through a pitch control part 14 so that the above-described difference becomes zero. Since the number of revolution of the main engine 11 can be controlled to a desired value by the control of the pitch, fuel can be economized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a propulsion system of a ship including a variable pitch propeller.

In conventional propulsion system control systems that include fixed pitch propellers, a constant speed governor works to maintain the rotational speed of the main engine at a desired constant value regardless of load fluctuations. FIG. 1 is an explanatory diagram of such a propulsion system control device, in which the main engine rotational speed N detected by the detection unit 1
The speed governor 2 compares the target rotation M degree Ns and opens and closes the control valve 5 of the main engine 4 via the valve operating section 3 so that the difference disappears.

By the way, in a device that performs such control, for example, when sailing in waves and the load torque of the propeller 6 fluctuates drastically, the speed governor tries to increase the rotation speed of the main engine every time the rotation speed of the main engine decreases. Valve 5 will be opened. As a result, during rough weather, large repeated stresses occur in the main engine shaft system, and the hull also suffers. It is subject to large impact stress due to waves, and at the same time causes a loss of 1 nautical energy (fuel).

The purpose of this invention is to solve these problems in conventional devices, and its gist is to automatically control the pitch of the variable pitch propeller without using a constant speed governor, thereby increasing the rotational speed of the main engine. The goal is to maintain the desired value.

The present invention will be explained with reference to FIG. 2. Reference numeral 11 is a diesel engine or turbine as the main engine of the ship, and its rotational speed N is detected by a detection unit 12 and not sent to a controller 13. The controller 13 compares this value N with the target rotational speed Ns, and controls the variable pitch propeller 1 via the pitch operation unit 14 so that the difference disappears.
Controls the pitch of 5.

On the other hand, the control valve 16 of the main engine 11 (main steam valve if the main engine is a turbine, fuel rack if the main engine is a diesel engine)
is placed outside the feedback control system as described above, and is controlled to obtain the desired main engine output.

Now, suppose that the load on the propeller 15 has increased and the main engine rotational speed N has become smaller than the target value Ns.
reduce the pitch. As the pitch decreases, the load on the propeller decreases, which increases the rotation of the main engine.

When the propeller load decreases, such as when the stern is raised, and the main engine rotation increases, the controller increases the pitch of the propeller, thereby lowering the main engine rotation and preventing the main engine from over-rotating. In this way, the main engine 11 always maintains a constant rotational speed regardless of changes in propeller load. During this time, the opening degree of the control valve 16 is held constant, so there is no fluctuation in the output (and therefore fuel consumption) of the main engine.

As explained above, in the device of the present invention, when the load increases and the main engine rotation speed decreases, instead of increasing the main engine output, the propeller pitch is reduced to reduce the load to an appropriate value. Since the rotational speed can be recovered, when the load fluctuates drastically due to sailing in waves, it is possible to prevent wide damage to the hull and the barrier, and it also has the effect of not wasting a charge. be.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional propulsion system control device, and FIG. 2 is an explanatory diagram of a propulsion system control device showing an embodiment of the present invention. 11... Main engine 12... Detection section 13...
Controller -4...Pitch operation M 15...
・Variable pitch propeller 16... Control valve agent Yoshiaki Satake

Claims (1)

[Claims] 1. A propulsion system control device for a ship, characterized in that the pitch of a variable pitch propeller driven by the main engine is automatically controlled so that the rotational speed of the main engine is maintained at a desired value.