JPH03197296A - Auxiliary propulsive equipment for planing boat - Google Patents

Abstract

PURPOSE:To increase the propulsion of a screw by connecting a dynamotor to the output shaft of an engine of a planing boat, storing the output of the dynamotor in a large capacity capacitor and driving the dynamotor as a motor when further increase of the boat speed is needed where the engine output is maximal. CONSTITUTION:In a boat 1 cruising on water with the propulsion of a screw 4, a propulsion device, attached to an output shaft of an engine 2 loaded on the boat, a dynamotor 5 to be operated as a motor and a generator is connected to an output shaft 3 through gears 31, 51. While the engine 2 is operated normally, the dynamotor 5 is operated as a generator by means of the engine torque, and generated power is stored in a large capacity capacitor 7 through a regulator 61 and a switch 62. And when further increase of the boat speed is needed where the engine is operated in full speed, a switch 72 is turned on to supply the power from the capacitor 7 to the dynamotor 5, and the dynamotor is operated as a motor to increase the propulsion of the screw 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thrust auxiliary device for a personal watercraft that assists thrust when the personal watercraft running on water lacks thrust.

(Prior Art) A glider that glides on water is equipped with an engine that has a thrust that exceeds the running resistance during gliding.

FIG. 4 is a curve diagram showing an example of the relationship between speed, running resistance, and thrust of a personal watercraft, and shows thrust forces A, B, and C of the personal watercraft and a resistance curve.

In the same figure, in order for the planing boat to enter the planing state with thrust B, the thrust must exceed the peak point P on the resistance Ha D, but once this point P is exceeded, the running resistance decreases and the necessary thrust is will also decrease. Usually, in order to exceed the peak point P, a high-output engine having a thrust A larger than the thrust B, for example, is mounted. Note that the illustrated point X is the point where thrust B and running resistance are balanced, and no increase in speed can be expected.
It is the point of maximum velocity in that thrust.

On the other hand, a proposal to increase the ship's thrust is to make the ship an electric propulsion system using two or more propulsion generators, and to use one or more of the propulsion generators as a backup generator for cask cooling. Spent nuclear fuel transport ship opened in 1988
It is disclosed in Japanese Patent No.-156894.

(Problems to be Solved by the Invention) Mounting an engine with a thrust exceeding the point P in the curve diagram shown in FIG.
The weight of the engine is also a problem, and the resistance of boats is proportional to the square of the weight, so the resistance increases and fuel consumption and performance deteriorate.

In addition, in the proposal disclosed in the publication, one or more of the propulsion generators of the transport ship must be prepared as a spare for the cask cooling generator, which poses a problem of cost and maintenance.

The present invention was made in view of such conventional problems, and its purpose is to provide a planing boat that attempts to obtain thrust that exceeds the peak of running resistance without requiring a high-thrust engine or spare equipment. The objective is to provide a thrust auxiliary device for the

(Means for Solving the Problems) According to the present invention, a dia motor connected to an engine output shaft of a personal watercraft, an energy storage device for storing electric power during power generation operation of the dia motor, and an energy storage device for storing electric power during power generation operation of the motor, and Thrust assistance for a personal watercraft, which has a speed sensor that detects the speed, and a thrust increasing means that supplies electric power from an energy storage device to a dia motor to run as an electric motor and increase thrust when the engine is at maximum output and the boat speed does not increase. Equipment is provided.

(Function) The present invention is equipped with a dia motor that serves as a generator-motor connected to the output shaft of the engine of a personal watercraft, and an electric double layer capacitor with a large capacitance that stores the output of the dia motor during power generation. In order to exceed the peak time of the engine, by supplying the charge of the electric double layer capacitor to the dia motor and driving it as an electric motor, it is possible to increase the torque of the engine and increase the thrust.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a schematic explanatory diagram of a personal watercraft showing an embodiment of the present invention;
FIG. 2 is a block diagram showing the configuration of this embodiment.

In these drawings, reference numeral 1 denotes a hull, which moves forward on the water by the thrust of a screw 4 serving as a propulsion device attached to an output shaft 3 of an onboard Sareta engine 2.

5 is a dia motor serving as an electric generator, and is equipped with a gear 51 that meshes with a gear 31 disposed on the output shaft 3.
During normal operation, it is driven by the engine torque to generate electricity, and the battery 6 is powered through the regulator 61.
charging is performed.

Further, when the thrust of the screw 4 does not exceed the running resistance when the engine 2 is running at full capacity, power is supplied from a capacitor to be described later, and the output shaft 3 is driven by electric operation to increase the thrust of the screw 4. . The dia motor 5 is a brushless motor that uses a permanent magnet in its rotor, and employs an efficient rotating electric machine that does not cause frictional resistance loss due to brushes and does not require maintenance.

7 is a capacitor that serves as an energy storage device, and is made of an electric double layer capacitor with a large capacitance, and has a long life even if full charging and discharging are repeated many times or rapid discharging is performed. It is charged by the electric power from the battery 6 and the dia motor 5 during power generation operation, and the stored charge is energized to the dia motor 5 in order to energize the thrust of the engine 2 as described above. A power storage amount sensor 71 for measuring the amount of power stored in the capacitor 7 is attached to the capacitor 7, and is wired so as to manually send a measured signal to the control device 8.

In addition, 62 is an A switch, which opens and closes the charging current from the battery 6 to the capacitor 7, and 72 is a B switch.
It is arranged between the diamotor 5 and the capacitor 7 to control the current between them, and the opening and closing of these switches is controlled by commands from the control device 8.

The control device 8 is composed of a microcomputer, and includes a central control unit for performing arithmetic processing, various memories for storing arithmetic processing procedures, control procedures, etc., human/output circuits, and the like. The configuration is such that when signals from the speed sensor 11 that detects the speed of the hull 1, the accelerator mechanism 12, and the stored power sensor 71 are input manually, control commands are issued to the engine 2, the A switch 62, the B switch 72, etc. has been done.

FIG. 3 is a process flow diagram showing an example of the operation of this embodiment, and the operation will be explained using this figure.

First, the operating position from the accelerator mechanism 12 is read, and a check is performed in step 1 to see if the accelerator is full.
If it is full, the process proceeds to step 2, where the signal from the stored power sensor 71 is checked.

Here, the amount of electricity stored in the capacitor 7 is large, and the dia motor 5
If it is determined that the electric power is sufficient for the electric drive, the A switch 62 is turned off in step 3 since charging from the battery 6 is unnecessary.

Next, the speed signal from the speed sensor 11 is read, and in step 4 it is determined whether or not the speed is increasing.
If the accelerator is fully pressed and the speed does not increase, it is determined that the state is at point X in FIG. is supplied and driven as an electric motor. Therefore, the torque of the dia motor 5 is
The torque is transmitted to the output shaft 3 via the gear 31, energizes the torque of the engine 2, increases the thrust of the screw 4, and overcomes the running resistance from point X to point P shown in FIG. This allows the hull to be guided into a planing state.

Note that if the capacitor 7 is not sufficiently charged according to the signal from the stored electricity amount sensor 71 in step 2, the process proceeds to step 6 and the A switch 62 is turned on to charge the capacitor 7 with the power from the battery 6. Alternatively, the capacitor 7 may be charged by the output of the dia motor 5 which is driven by the engine torque by closing the B switch 72.

If the accelerator is not fully pressed in step 1, the process proceeds to step 7, where the amount of electricity stored in the capacitor 7 is checked based on the signal from the amount of electricity sensor 71. If it is not fully charged, proceed to step 8 and switch B switch 7.
2 is turned on, charging is performed using the output of the diamtor 5 operating as a generator, and if the battery is being charged, the process proceeds to step 9 and the B switch 72 is controlled to be turned off.

Although the present invention has been described above using the above-mentioned embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

(Effects of the Invention) According to the present invention, a dia motor connected to the engine output shaft of a personal watercraft, a large capacity capacitor that stores the output of the dia motor during power generation operation, and a speed sensor of the personal watercraft, If the boat speed does not increase when the engine output is at its maximum, the power from the capacitor is supplied to the dia motor for electric drive and the engine torque is energized, so the thrust increases and overcomes the running resistance at peak times. You can achieve the same effect as installing a high-output engine.

Therefore, the engine can be made smaller and weigh less, which is advantageous in terms of fuel consumption and costs, and there is also the advantage that a spare generator that is used for other purposes is not required.

Further, according to the present invention, since the thrust assist device is provided which uses electric power from a separate system from the original engine, there is also an effect that vibrations, noise, etc. are reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a personal watercraft showing an embodiment of the present invention;
Fig. 2 is a block diagram showing the configuration of this embodiment, Fig. 3 is a processing flow diagram showing an example of the operation of this embodiment, and Fig. 4 is a curve showing the relationship among the speed, running resistance, thrust, etc. of the personal watercraft. It is a diagram. 1... Hull, 2... Engine, 3... Output shaft, 5
. . . Diamotor, 6. Battery, 7. Capacitor, 8. Control device 1.11. Speed sensor.

Claims (2)

[Claims] (1) A dia motor connected to the engine output shaft of the personal watercraft, an energy storage device that stores electric power during power generation operation of the dia motor, and a speed sensor that detects the speed of the personal watercraft;
A thrust auxiliary device for a personal watercraft characterized by having a thrust increasing means for supplying electric power from an energy storage device to a diamotor to run as an electric motor and increase thrust when the boat speed does not increase when the engine is at maximum output. . (2) The thrust assist device for a personal watercraft according to claim (1), wherein the energy storage device is an electric double layer capacitor.