JPS6228813A - Driving control device for ship generator - Google Patents

Abstract

PURPOSE:To hold the number of revolutions of a generator fixedly and stably by finding out a periodical rotational variation component of a main engine and executing feedforward control by a control signal having its inversed component. CONSTITUTION:The rotation of an output shaft 2 of the main engine 1 is detected by a rotation detector 15 and the detecting signal is Fourier-developed by a frequency analyzing circuit 19 for temporarily storing its input to calculate the frequency rotating variation component. The amplitude and phase of the variation component are calculated by an analyzing circuit 20 and a control signal having a component inverted from the variation component is found out by a frequency generating device 21. The signal is supplied to an inclined rotation angle control circuit 18 through a phase compensation circuit 23, the inclination of an inclined plate of a hydraulic motor 12 is changed and a planetary gear mechanism 4 of a working gear f0r driving the generator 7 is controlled to attain feedforward control based on the component inverted from the rotational variation component. Consequently, the number of revolutions of the generator is held fixedly and stably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a differential planetary gear device for a marine power generation system.

[Prior Art] Fig. 3 does not show an example of a conventional device, in which most of the output of the main engine 1 is transmitted to the propeller 3 via the output shaft 2, and the output shaft 2 The planetary gear 5 of the i-ri gear mechanism groove 4 is connected to the planetary gear mechanism 4, and a generator 7 is further connected to the sun gear 6 of the planetary gear mechanism 4 to be driven.

This power generation PP17 supplies electrical energy to the electrical equipment inside the ship.

A hydraulic pump 9 is linked to the output shaft 2 through a gear 8, and the hydraulic pump 9 is connected to a hydraulic motor 12 capable of controlling the tilting angle through a pipe 10 and a hydraulic unit 11. The hydraulic motor 12 is connected to an adjustment gear 14 that meshes with a ring gear 13 of the planetary gear mechanism 4.

In the above, the rotation speed of the main engine 1 fluctuates periodically due to the influence of waves, etc., and this fluctuation is transmitted to the generator 7, which is undesirable in terms of keeping the generator frequency constant.

For this reason, in the past, for example, the rotation speed of the output shaft 2 was detected by a detector.
5, and the detection signal 16 is sent to the signal processing circuit 1.
7, detects fluctuations in the rotation speed, operates the tilt angle control 1iiH according to the fluctuations, and adjusts the tilt angle of the hydraulic motor 12 to maintain the rotation speed of the generator 7 at a constant level. It is controlled to get close to the current state.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional device, the rotation speed of the generator 7 is controlled to match the reference rotation speed using a feedback signal, so the control is unstable. The problem was that the generator's rotation speed fluctuated by 70 degrees.

An object of the present invention is to determine the periodic rotational fluctuation component of the main engine and perform feed guard control using a control signal of the opposite component so that the fluctuation component disappears.

[Means for solving the problems] The present invention attempts to solve the above technical problems, and
The generator is connected to the output shaft of the ship's main engine via a differential gear mechanism, and the rotation speed is kept constant by adjusting the inclination angle of the hydraulic drive device that operates the adjustment gear meshed with the differential gear mechanism. A drive control device configured to control the rotation speed of an output shaft, comprising: a detector for detecting the rotation speed of an output shaft; a frequency analysis circuit for calculating a frequency rotation fluctuation component by Fourier expansion of the rotation speed signal from the detector; an analysis circuit that extracts the amplitude and phase from the fluctuation component, a negative frequency ¥1 generation circuit that outputs a control signal opposite to the fluctuation component, a phase compensation circuit that performs phase adjustment, and a hydraulic drive according to the control signal. This invention relates to a drive control device for a marine generator, characterized in that it further includes a tilting angle control device for controlling the rolling angle of the device.

[Function] Therefore, in the present invention, the frequency rotation fluctuation component is obtained from the rotation speed signal of the output shaft by Fourier analysis, and the drive adjustment of the differential gear mechanism is performed using a control signal opposite to the fluctuation component. The rotational speed of the generator can be stably maintained at a constant level by controlling the tilting angle using the feed valve.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 does not show an example of the present invention applied to the apparatus shown in FIG. 3, and parts with the same reference numerals in the figure represent the same parts.

Output as shown! Meter 15 detects the rotation speed of ll12
The detected signal 16 is sent to the frequency analysis circuit 1.
9 is entered.

As shown in FIG. 2, the output shaft 2 of the main engine 1 has a periodic fluctuation component, which can therefore be resolved into sine components by Fourier expansion.

The frequency analysis circuit 19 has a storage function, stores the detection signal from the rotation speed detector 15 over time, and performs Fourier expansion of the signal to calculate the frequency rotation fluctuation component W=A sin (wt+φ). It's starting to look like this.

Next, the fluctuation component obtained by the frequency analysis circuit 19 is guided to the analysis circuit 20 to calculate the amplitude φ and phase A of the fluctuation component, and further a negative frequency generator 21 generates a control signal 22 opposite to the fluctuation component. That is, after the control signal 22 is matched in phase by the phase compensation circuit 23, the tilt angle control device 1 is controlled by the control signal.
8 and adjusts the tilt angle 8 of the hydraulic motor 12 to control the rotational speed of the electric motor 7 to be constant.

Further, the above operation is performed every required time or continuously to modify the control signal.

In the above embodiment, the case where the tilting angle of the hydraulic motor in the hydraulic drive device is adjusted is illustrated, but it can also be applied to the case where the tilting angle of the oil pump side is adjusted. Various rotation speed detection positions, detection methods, etc. can be selected.
Of course, various other changes may be made without departing from the spirit of the present invention.

[Effects of the Invention 1 As described above, the power generation unit of the present invention can be driven easily!
According to the I device, the rotation speed of the output shaft is detected, the frequency rotation fluctuation component is obtained from the rotation speed signal by Fourier expansion, and the rotation of the generator is controlled by a feed-fuker art using a control signal opposite to the fluctuation component. As a result, the rotation speed of the generator can be stabilized at a constant state without fluctuation, and a) excellent effects can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a frequency rotation fluctuation state, and FIG. 3 is an explanatory diagram showing an example of a conventional device. 1 is the main engine, 2 is the output shaft, 4 is the free gear mechanism, 7 is the generator, 9 is the hydraulic pump, 12 is the hydraulic motor, 1.1 is the adjustment gear, 15 is the rotation speed detector, 18 is the tilt angle control device, 1
9 is a frequency analysis circuit, 20 is an analysis circuit, 21 is a negative frequency generation circuit, 22 is a control signal, and 23 is a phase compensation circuit.

Claims (1)

[Claims] 1) The rotation speed of a generator connected to the output shaft of the ship's main engine via a differential gear mechanism is adjusted by adjusting the inclination angle of the hydraulic drive device that operates the adjustment gear meshed with the differential gear mechanism. A drive control device configured to perform constant control, comprising: a detector for detecting the rotational speed of an output shaft; a frequency analysis circuit for calculating a frequency rotation fluctuation component by Fourier expansion of the rotational speed signal from the detector; an analysis circuit that calculates amplitude and phase from a fluctuation component; a negative frequency generation circuit that outputs a control signal opposite to the fluctuation component; a phase compensation circuit that performs phase adjustment; 1. A drive control device for a marine generator, comprising a tilting angle control device for controlling a tilting angle.