JP7177691B2 - Controllable pitch propeller control system, control method for controllable pitch propeller - Google Patents

Description

The present invention relates to a controllable pitch propeller control system and control method for a controllable pitch propeller.

Side thrusters with variable pitch propellers are known. For example, US Pat. No. 6,200,003 describes a side thruster in a lateral tunnel of a hull with a variable-pitch propeller that rotates about the axis of the tunnel. The variable pitch propeller is equipped with propeller blades that are rotatable with respect to the propeller boss.

Japanese Utility Model Laid-Open No. 02-056799

The inventors of the present invention have recognized the following about a variable-pitch propeller that is rotationally driven by an electric motor about the rotation axis of the propeller boss.
For example, the variable pitch propeller of the side thruster has propeller blades rotatable about a rotation axis extending in a direction intersecting the rotation axis of the propeller boss. The propeller blades are configured to be rotatable in positive and negative directions around 0° up to a mechanical maximum blade angle. A variable pitch propeller can control the thrust of a thruster by changing the rotation angle of propeller blades (hereinafter referred to as "blade angle").

The blade angle of the controllable pitch propeller should be within a range (hereinafter referred to as the "maximum angle for control") in which the motor drive current does not become excessive due to the seawater resistance caused by the rotation of the propeller. . For this reason, it is conceivable to mount a variable pitch propeller on the hull, rotate it in the sea, measure the drive current of the motor, and set the maximum angle for blade angle control based on the result.

However, with conventional controllable pitch propellers, the maximum angle for blade angle control can be set by a skilled operator who manually changes the blade angle while visually reading the current value of the motor. Therefore, there is a problem that it is difficult to improve the setting accuracy.
Based on these findings, the inventors of the present invention have recognized that the variable pitch propeller described in Patent Document 1 has room for improvement from the viewpoint of increasing the accuracy of setting the maximum angle for blade angle control.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a variable pitch propeller control system capable of improving the accuracy of setting the maximum angle for blade angle control.

In order to solve the above problems, a variable pitch propeller control system according to one aspect of the present invention includes an acquisition unit that acquires the current value of the motor while changing the blade angle of the variable pitch propeller rotationally driven by the motor; a setting unit for setting the maximum angle for blade angle control according to the current value acquired by the unit;

According to this aspect, the maximum angle for blade angle control can be set by the setting unit.

In addition, any combination of the above, and the mutual replacement of the components and expressions of the present invention between methods, devices, programs, temporary or non-temporary storage media recording programs, systems, etc. It is effective as an aspect of the present invention.

According to the present invention, it is possible to provide a variable pitch propeller control system capable of improving the setting accuracy of the maximum angle for blade angle control.

It is an explanatory view showing roughly an example of a variable pitch propeller control system concerning a 1st embodiment. 2 is a block diagram schematically showing the configuration of a blade angle setting section of the variable pitch propeller control system of FIG. 1; FIG. FIG. 2 is a flow chart illustrating an example of the operation of the variable pitch propeller control system of FIG. 1; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on preferred embodiments with reference to the drawings. In the embodiment and modified examples, the same or equivalent constituent elements and members are denoted by the same reference numerals, and overlapping descriptions are omitted as appropriate. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Also, in each drawing, some of the members that are not important for explaining the embodiments are omitted.
Also, terms including ordinal numbers such as first, second, etc. are used to describe various components, but these terms are used only for the purpose of distinguishing one component from other components, and the terms The constituent elements are not limited by

[First embodiment]
A configuration of a variable pitch propeller control system 100 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 is an explanatory diagram schematically showing a variable pitch propeller control system 100. As shown in FIG.

A variable pitch propeller control system 100 of this embodiment is a system for controlling a variable pitch propeller 10 for a side thruster. A side thruster is a propulsion device installed at the bow or stern of the hull, and enables ship maneuvering such as turning and lateral movement when leaving or docking. A variable pitch propeller 10 is mounted in the transverse tunnel of the hull and produces thrust by rotating about the axis of the tunnel.

A controllable-pitch propeller control system 100 of this embodiment mainly includes a controllable-pitch propeller 10, a motor 20, a rotating shaft 22, a current sensor 24, a blade angle sensor 26, a hydraulic solenoid valve 28, a blade angle setting A unit 30 , an operation unit 32 , and a display unit 34 are provided. The motor 20 is an electric motor that rotates based on supplied electric power. Hereinafter, the direction along the rotation axis La of the motor 20 will be referred to as the "axial direction", and the circumferential direction and radial direction of a circle centered on the axis La will be referred to as the "circumferential direction" and the "radial direction", respectively. Further, hereinafter, for the sake of convenience, one side in the axial direction (left side in the drawing) will be referred to as the input side, and the other side (right side in the drawing) will be referred to as the non-input side.

The rotating shaft 22 is a shaft that transmits rotation of the motor 20 to the variable pitch propeller 10 . The current sensor 24 detects the current value of the driving current of the motor 20 as the motor current value Im, and outputs the detection result to the blade angle setting section 30 . Current sensor 24 may be based on various known principles. The blade angle sensor 26 detects the rotation angle of the propeller blades 12 of the variable pitch propeller 10 as the blade angle Af, and outputs the detection result to the blade angle setting section 30 . Wing angle sensor 26 may be a tracking oscillator. The hydraulic solenoid valve 28 supplies the operating oil 28p to the propeller blade driving section 16 based on the control of the blade angle setting section 30 to change the blade angle Af of the propeller blade 12 . The hydraulic solenoid valve 28 includes a first solenoid valve that changes the blade angle Af in the first direction and a second solenoid valve that changes the blade angle Af in the second direction. The first direction and the second direction will be described later.

The blade angle setting unit 30 controls the blade angle Af of the propeller blade 12, acquires the motor current value Im while changing the blade angle Af, and determines the control of the blade angle Af according to the acquired motor current value Im. Set maximum angle. The operation unit 32 detects the operation of the operator and outputs the detection result to the blade angle setting unit 30 . The display unit 34 displays predetermined information under the control of the blade angle setting unit 30 . The blade angle setting section 30, the operation section 32 and the display section 34 may be provided integrally. The wing angle setting unit 30, the operation unit 32, and the display unit 34 may be housed in a housing that can be attached to and detached from the hull, and configured as one piece of electronic equipment. In this case, the electronic device may include an information terminal such as a notebook PC or a tablet.

The variable pitch propeller 10 has a propeller base 18 , a propeller boss 14 , a plurality of propeller blades 12 and a propeller blade drive section 16 . The propeller base 18 is a cylindrical portion that extends axially along the axis La and is fixed to the non-input side of the rotary shaft 22 . The propeller boss 14 is a cannonball-shaped portion protruding axially from the non-input side of the propeller base 18 .

The plurality of propeller vanes 12 are blade-shaped members protruding radially outward from the outer peripheral surface of the propeller boss 14 . A plurality of propeller blades 12 are arranged at predetermined intervals in the circumferential direction. The propeller blades 12 are rotatable about an axis Lb that intersects the axis La. In the present embodiment, the axis Lb is perpendicular to the axis La and extends in the radial direction.

The propeller blade drive unit 16 is a drive device that is built in the propeller boss 14 and rotates each propeller blade 12 around the axis Lb. The propeller blade drive unit 16 rotates the propeller blades 12 to a blade angle Af determined according to the hydraulic balance of the two systems of hydraulic oil supplied from the hydraulic solenoid valve 28 . Therefore, the blade angle Af of the propeller blade 12 is the angle around the axis Lb.

Rotation of the motor 20 causes the propeller 10 to rotate via the rotating shaft 22 to generate axial thrust. The blade angle Af of the propeller blade 12 at which the axial thrust generated when the propeller 10 is rotated is the minimum is assumed to be 0°. When the blade angle Af is 0°, the water resistance received by the propeller blades 12 is also minimal. For the sake of convenience, when the propeller 10 is rotated while changing the blade angle Af from 0° to a direction opposite to the input side, a water flow is generated. is referred to as the "second direction". The first direction and the second direction may correspond to the PORT side and the STBD (Starboard) side. The propeller blades 12 are configured to be rotatable in the first direction and the second direction from a blade angle Af of 0° to a mechanically limited maximum angle. The blade angle Af at the middle point between the maximum angle in the first direction and the maximum angle in the second direction may be 0°.

Next, the blade angle setting section 30 will be described with reference to FIG. 2 as well. FIG. 2 is a block diagram schematically showing the configuration of the blade angle setting section 30. As shown in FIG. Each functional block shown in FIG. 2 can be realized by electronic elements such as a CPU of a computer, mechanical parts, etc. in terms of hardware, and realized by computer programs etc. in terms of software. It depicts the functional blocks realized by cooperation. Therefore, those skilled in the art will understand that these functional blocks can be realized in various ways by combining hardware and software.

The blade angle setting unit 30 of the present embodiment includes an operation result acquisition unit 30b, a current value acquisition unit 30c, a blade angle acquisition unit 30d, a determination unit 30e, a determination unit 30f, a storage unit 30g, and a motor control unit. 30h, an electromagnetic valve control unit 30j, a display control unit 30k, a frequency identification unit 30m, an output unit 30n, and an information communication unit 30p.

The operation result acquisition unit 30 b acquires the operation result of the operator from the operation unit 32 . The current value acquisition unit 30 c acquires the current value Im of the motor 20 from the current sensor 24 . The blade angle acquisition unit 30 d acquires the blade angle Af of the propeller blade 12 from the blade angle sensor 26 . The determination unit 30e determines whether or not the acquired current value Im exceeds a preset reference value Is.

The determination unit 30f determines the blade angle Af when the current value Im reaches the reference value Is as the maximum angle Am for control. The reference value Is may be set according to the upper limit of the recommended operating current range of the motor 20, and may be, for example, an allowable current value or a value obtained by adding a margin thereto. Therefore, it is not recommended to operate the motor 20 over the reference value Is for a long time.

On the other hand, as the blade angle Af of the propeller blades 12 increases from 0°, the water resistance that the propeller blades 12 receive increases, so the current value Im of the motor 20 also increases. That is, it is desirable that the blade angle Af be controlled within a range in which the current value Im does not exceed the reference value Is. For these reasons, the blade angle Af when the current value Im is equal to the reference value Is is set to the maximum angle Am for control. The maximum angle Am may be smaller than the mechanically limited maximum angle.

Depending on the shape of the tunnel, the blade angle Af at which the current value Im exceeds the reference value Is may differ between the first direction and the second direction. Therefore, in the present embodiment, the maximum angle Am for control includes a first maximum angle Am1 in the first direction and a second maximum angle Am2 in the second direction. The first maximum angle Am1 is the blade angle Af at which the current value Im is equal to the reference value Is in the first direction. The second maximum angle Am2 is the blade angle Af at which the current value Im is equal to the reference value Is in the second direction.

The storage unit 30g stores setting information such as a reference value Is and a threshold to be described later. The storage unit 30g stores predetermined information such as the current value Im and the maximum angle Am. The storage unit 30g may store the blade angle Af and the corresponding current value Im in time series. The motor control section 30h controls ON/OFF of the motor 20 . Note that the motor control section 30 h may be provided outside the blade angle setting section 30 . The solenoid valve control section 30j controls the solenoid valve 28 to hydraulically drive the propeller blade drive section 16 to change the blade angle Af of the propeller blade 12 .

The display control unit 30k controls the display unit 34 to display predetermined information such as the current value Im and the maximum angle Am. The frequency specifying unit 30m specifies the frequency Fo at which the current value Im exceeds the reference value Is, and generates frequency information Fp according to the frequency Fo. The frequency information Fp may be a result of classifying the degree Fo into a plurality of sections based on thresholds. When the frequency Fo is equal to or less than the threshold, the classification may be made into the first level, and when the frequency Fo exceeds the threshold, the classification may be made into the second level. The frequency Fo and the frequency information Fp may be stored in the storage unit 30g.

The information communication unit 30p outputs predetermined information such as the current value Im, the maximum angle Am, and the frequency Fo to the outside. For example, the information communication unit 30p may transmit information such as the current value Im, the maximum angle Am, the frequency Fo, and the frequency information Fp to the information terminal 36 capable of transmitting and receiving information via a network. The information communication unit 30p may receive information such as the reference value Is and the threshold value from the information terminal 36 and set/change the setting information of the blade angle setting unit 30. FIG. That is, the blade angle setting section 30 is configured to be operable by the information terminal 36 via the information communication section 30p. The information terminal 36 may be a desktop PC, or a portable information processing device such as a notebook PC or a tablet terminal.

When the frequency Fo exceeds the threshold value and the frequency information Fp is at the second level, the output unit 30n controls the notification unit 38 to perform notification prompting resetting of the maximum angle Am. The notification unit 38 may output a signal perceivable by a person according to the frequency information Fp. The notification unit 38 may have an LED that emits light of a color corresponding to the frequency information Fp.

(Setting operation)
Next, an example of the operation of the propeller control system 100 will be described also with reference to FIG. FIG. 3 is a flow chart showing an example of the operation of the propeller control system 100. As shown in FIG. This figure shows a setting operation S80 for setting the maximum angle Am for controlling the blade angle Af of this system.

The setting operation S80 is performed, for example, while the hull is on the ocean. The setting operation S80 is started when the operator operates the operation unit 32 to start the setting operation. When the setting operation S80 is started, the blade angle setting section 30 turns on the motor 20 to rotate the propeller 10 at a predetermined speed (step S81).

When propeller 10 reaches a predetermined rotational speed, blade angle setting unit 30 turns on the blade angle adjustment mode while maintaining the rotational speed of propeller 10 (step S82).

When the blade angle adjustment mode is turned on, the blade angle setting unit 30 determines whether or not the blade angle Af is 0° (step S83). If the blade angle Af is not 0° (N in step S83), the blade angle setting unit 30 controls the electromagnetic valve 28 to set the blade angle Af to 0° (step S84).

If the blade angle Af is 0° (Y in step S83), the blade angle setting unit 30 turns on the first electromagnetic valve (step S85). As a result, the propeller blade 12 rotates about the axis Lb, and the blade angle Af gradually increases in the first direction.

After turning ON the first solenoid valve, the blade angle setting unit 30 determines whether or not the current value Im of the motor 20 is smaller than the reference value Is (step S86). If the current value Im is smaller than the reference value Is (Y in step S86), the blade angle setting unit 30 returns the process to the beginning of step S85, and repeats the processes of steps S85 and S86.

If the current value Im is not less than (equal to or greater than) the reference value Is (N in step S86), the blade angle setting unit 30 turns off the first solenoid valve (step S87). As a result, the blade angle Af is maintained in the previous state.

After turning off the first solenoid valve, the blade angle setting unit 30 acquires the blade angle Af and sets the acquired blade angle Af to the first maximum angle Am1 (step S88). At this step, the first maximum angle Am1 is stored in the storage unit 30g.

After setting the first maximum angle Am1, the blade angle setting unit 30 controls the electromagnetic valve 28 to set the blade angle Af to 0° (step S89). In the step of setting the blade angle Af to 0°, since the overall value of the current value Im is the same on the first direction side and the second direction side, when setting the blade angle on the second direction side, the first direction This is provided to prevent misidentification as the side current value and incorrect setting.

After setting the blade angle Af to 0°, the blade angle setting unit 30 turns on the second electromagnetic valve (step S90). As a result, the propeller blades 12 rotate about the axis Lb, and the blade angle Af gradually increases in the second direction.

After turning on the second solenoid valve, the blade angle setting unit 30 determines whether or not the current value Im of the motor 20 is smaller than the reference value Is (step S91). If the current value Im is smaller than the reference value Is (Y in step S91), the blade angle setting unit 30 returns the process to the beginning of step S90, and repeats the processes of steps S90 to S91.

If the current value Im is not smaller (equal to or greater than) the reference value Is (N in step S91), the blade angle setting unit 30 turns off the second electromagnetic valve (step S92). As a result, the blade angle Af is maintained in the previous state.

After turning off the second solenoid valve, the blade angle setting unit 30 acquires the blade angle Af and sets the acquired blade angle Af to the second maximum angle Am2 (step S93). At this step, the second maximum angle Am2 is stored in the storage unit 30g.

After setting the second maximum angle Am2, the blade angle setting unit 30 controls the electromagnetic valve 28 to set the blade angle Af to 0° (step S94).

After completing step S94, the blade angle setting unit 30 ends the processing of the setting operation S80. If an emergency stop operation is performed on the operation unit 32 during the process of the setting operation S80, the blade angle setting unit 30 forcibly terminates the processing of the setting operation S80 (step S95). The above processing is merely an example, and other steps may be added, some steps may be changed or deleted, and the order of steps may be changed.

The operation and effect of the variable pitch propeller control system 100 of this embodiment configured in this way will be described.

The variable pitch propeller control system 100 includes an acquisition unit that acquires a current value Im of the motor 20 while changing the blade angle Af of the variable pitch propeller 10 that is rotationally driven at a predetermined speed by the motor 20, and an acquisition unit that acquires the current value Im. A setting unit for setting a maximum angle Am for control of the blade angle Af according to the current value Im.

According to this configuration, the setting accuracy can be improved because the operator does not change the blade angle while visually reading the current value of the motor. The time required for setting can be shortened, and the setting work can be automated, thereby reducing the man-hours for the setting work.

The determination unit 30f described above may set the maximum angle Am based on a preset reference value Is. In this case, since the maximum angle for control is determined based on the reference value, setting errors can be suppressed.

The above-described system may include a blade angle obtaining section that obtains the blade angle Af, and the determination section 30f may set the maximum angle Am based on the obtained blade angle Af obtained by the blade angle obtaining section. In this case, since the measured blade angle Af is used to determine the maximum angle Am, setting errors can be suppressed compared to the case where the measured value is not used.

The determination unit 30f described above determines a first maximum angle Am1 when the blade angle Af is changed in the first direction, and a second maximum angle Am1 when the blade angle Af is changed in a second direction opposite to the first direction. The angle Am2 may be set as the maximum angle Am. In this case, in the propeller provided in the tunnel of the hull, the maximum angle of the blade angle Af may differ between the first direction and the second direction due to the influence of the shape of the tunnel. , the setting error due to the difference in direction can be suppressed.

The system described above may further include an output unit that outputs predetermined information to the outside according to the frequency with which the current value Im exceeds the reference value Is when the variable pitch propeller 10 is used. In this case, when an error in which the current value Im exceeds the reference value Is frequently occurs due to deterioration over time, the operator can be notified to prompt resetting.

The determination unit 30f described above may be configured to be operable by an information terminal 36 capable of transmitting and receiving information. In this case, setting information can be easily set and changed by connecting the information terminal 36 .

[Second embodiment]
A second embodiment of the present invention will be described. In the description of the second embodiment, the same reference numerals are given to the same or equivalent components and members as in the first embodiment. Explanations overlapping with those of the first embodiment will be appropriately omitted, and the explanation will focus on the configuration different from that of the first embodiment.

A second embodiment of the present invention is a control method for a variable pitch propeller control system 100. FIG. This method includes a current value obtaining step of obtaining the current value Im of the motor 20 while changing the blade angle Af of the variable pitch propeller 10 rotationally driven by the motor 20, and the current value Im obtained in the current value obtaining step. a setting step of setting a control maximum angle Am of the blade angle Af accordingly.

According to the second embodiment, the setting accuracy can be improved because the operator does not change the blade angle while visually reading the current value of the motor. The time required for setting can be shortened, and the setting work can be automated, thereby reducing the man-hours for the setting work.

Exemplary embodiments of the present invention have been described above in detail. All of the above-described embodiments merely show specific examples for carrying out the present invention. The contents of the embodiments do not limit the technical scope of the present invention, and many design changes such as changes, additions, and deletions of constituent elements can be made without departing from the spirit of the invention defined in the claims. It is possible. In the above-described embodiment, descriptions such as "of the embodiment", "in the embodiment", etc. are added to the contents that allow such design changes. Changes are not unacceptable.

[Modification]
Modifications will be described below. In the drawings and description of the modified example, the same reference numerals are given to the same or equivalent components and members as the embodiment. Descriptions that overlap with the embodiment will be omitted as appropriate, and the configuration that is different from the first embodiment will be mainly described.

(First modification)
In the description of the embodiment, an example was shown in which the maximum angle Am for controlling the blade angle Af is set according to one measurement result, but the present invention is not limited to this. The maximum angle Am may be set according to multiple measurement results. In this case, it is possible to suppress setting errors caused by disturbances such as the state of waves on the sea surface. For example, a plurality of blade angles acquired by repeating the above setting operation a plurality of times may be statistically processed, and the maximum angle Am may be set based on the results of the statistical processing. The maximum angle Am may be set based on a simple average of a plurality of blade angles, or the maximum angle Am may be set based on the average of the remaining blade angles excluding the maximum and minimum blade angles, The maximum angle Am may be set based on the average of the blade angles excluding those considered to be outliers.

(Second modification)
In the description of the embodiment, an example in which the current value Im is acquired by continuously changing the blade angle Af was shown, but the present invention is not limited to this. The blade angle Af may be changed stepwise. For example, until the current value Im reaches a value close to the reference value Is (for example, 90% of the reference value Is), the blade angle Af is continuously changed, and when that value is exceeded, the current value Im reaches the reference value Is. , the blade angle Ar may be changed stepwise by a predetermined unit angle. In the step, the current value Im may be obtained while the solenoid valve 28 is stopped for a certain period of time until the current value Im stabilizes. By obtaining the current value Im in this way, it is possible to reduce errors due to fluctuations in the current value Im.

(Third modification)
In the description of the embodiment, an example of acquiring the blade angle Af when the current value Im reaches the reference value Is was shown, but the present invention is not limited to this. The blade angle Af is held for a certain period of time until the blade angle Af follows the current value Im reaching the reference value Is, and the maximum angle Am is set based on the average value of the blade angle Af during this holding time. may It is possible to reduce errors caused by fluctuations in the blade angle Af.

In the description of the embodiment, an example was given in which the blade angle Af when the current value Im reaches the reference value Is is determined as the maximum angle Am for control, but the present invention is not limited to this. For example, the current value Im and the blade angle Af corresponding to a plurality of points different from each other are obtained, the relationship between the current value Im and the blade angle Af is specified from these numerical values, and the blade corresponding to the reference value Is from the specified relationship The angle Af may be estimated and the maximum angle Am may be set based on the blade angle Af.

The above modifications may be combined arbitrarily. These modified examples have the same functions and effects as the embodiment.

Any combination of the above-described embodiments and modifications is also useful as embodiments of the present invention. A new embodiment resulting from the combination has the effects of each of the combined embodiments and modifications.

10 Variable pitch propeller 12 Propeller blade 20 Motor 24 Current sensor 26 Blade angle sensor 28 Hydraulic solenoid valve 30 Blade angle setting unit 30c Current Value acquisition unit 30d Blade angle acquisition unit 30f Setting unit 30n Output unit 38 Notification unit 100 Variable pitch propeller control system.

Claims (6)

an acquisition unit that acquires the current value of the motor while changing the blade angle of the variable pitch propeller rotationally driven by the motor;
a setting unit that sets a maximum angle for control of the blade angle according to the current value acquired by the acquisition unit ;
a blade angle acquisition unit that acquires the blade angle;
with
The variable pitch propeller control system , wherein the setting unit sets the maximum angle based on a preset reference value and the acquired blade angle acquired by the blade angle acquiring unit . an acquisition unit that acquires the current value of the motor while changing the blade angle of the variable pitch propeller rotationally driven by the motor;
a setting unit that sets a maximum angle for control of the blade angle according to the current value acquired by the acquisition unit;
The setting unit sets the maximum angle based on a preset reference value,
The setting unit sets a first maximum angle when the blade angle is changed in a first direction and a second maximum angle when the blade angle is changed in a second direction opposite to the first direction. , as said maximum angle . an acquisition unit that acquires the current value of the motor while changing the blade angle of the variable pitch propeller rotationally driven by the motor;
a setting unit that sets a maximum angle for control of the blade angle according to the current value acquired by the acquisition unit;
The setting unit sets the maximum angle based on a preset reference value,
A control system for a controllable pitch propeller, further comprising an output section that outputs predetermined information to the outside according to the frequency with which the current value exceeds the reference value when the controllable pitch propeller is in use. a motor control unit that controls a motor to maintain the rotational speed of the variable pitch propeller at a predetermined rotational speed;
a solenoid valve control unit that controls a hydraulic solenoid valve that changes the blade angle of the variable pitch propeller maintained at the predetermined rotational speed;
an acquisition unit that acquires a current value of the motor when the blade angle of the variable pitch propeller is changed by the electromagnetic valve control unit;
a determination unit that determines whether the acquired current value of the motor exceeds a reference value;
a setting unit that sets a blade angle of the variable pitch propeller when a motor current value exceeding the reference value is obtained as a maximum angle for control of the blade angle by the electromagnetic valve control unit;
A variable pitch propeller control system with a 5. A variable pitch propeller control system according to any one of claims 1 to 4 , wherein said setting unit is configured to be operable by an information terminal capable of transmitting and receiving information to and from each other. a current value acquisition step of acquiring a current value of the motor while changing the blade angle of a variable pitch propeller rotationally driven by the motor;
a setting step of setting a maximum angle for control of the blade angle according to the current value obtained in the current value obtaining step;
a blade angle obtaining step of obtaining the blade angle;
including
The setting step sets the maximum angle based on a preset reference value and the obtained blade angle obtained in the blade angle obtaining step .

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