JP4762404B2 - Jet-propelled planing boat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jet-propelled planing boat such as a small planing boat (Personal Watercraft; also referred to as PWC) that jets a water flow backward and sails on the water by the reaction, and in particular, the throttle is turned off. Sometimes it relates to a jet-propelled planing boat that can maintain the steering function.
[0002]
[Background Art and Problems to be Solved by the Invention]
In recent years, so-called jet-propelled planing boats have been widely used for leisure, sports or rescue. In this jet propulsion type personal watercraft, generally, water sucked from a water inlet provided on the bottom of the boat is pressurized and accelerated by a water jet pump and jetted backward to propel the hull.
[0003]
And, in the case of this jet propulsion type personal watercraft, by changing the water injection direction to the left and right by swinging the steering nozzle arranged behind the water jet pump injection port to the left and right, Steer the boat to the right or left.
[0004]
Therefore, in the case of a jet-propelled planing boat having such a configuration, when the throttle is closed to a fully closed position and the amount of water injected from the water jet pump is reduced, the thrust that can be used to turn the boat (for steering) At the same time, the ability to steer the boat is reduced until the throttle is reopened.
[0005]
In view of such a current situation, the present applicant has confirmed that the steering for steering that can maintain the ability to steer mechanically even if the throttle is closed to near full close and the amount of water injection from the water jet pump decreases. A jet propulsion type personal watercraft provided with a member was provided (Japanese Patent Application No. 2000-6708).
[0006]
However, in the case of the jet propulsion type personal watercraft, the number of parts increases, the structure becomes complicated, and the weight increases accordingly.
[0007]
The present invention has been made in view of such a situation, and when the steering operation means is operated without increasing the weight, the throttle is turned OFF to reduce the amount of water injected from the water jet pump. It is an object of the present invention to provide a jet propulsion planing boat that can maintain the steering of the boat even if it is.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, the above-described problem can be solved by a jet propulsion personal watercraft having the following configuration. That is,
The jet propulsion planing boat according to the first aspect of the present invention is a jet propulsion planing boat configured to inject water pressurized and accelerated by a water jet pump from a rear jet port and propel it by its reaction.
A steering position detection sensor for detecting a steering state of the steering operation means, and when a signal indicating that the steering operation means is operated is obtained from the steering position detection sensor,
The engine is characterized in that the engine speed is temporarily set to a predetermined value or more.
[0009]
Thus, according to the jet propulsion type personal watercraft configured as described above, when the steering operation means is operated in the state where the throttle is turned OFF, the steering position detection sensor detects the operation, and the engine speed is temporarily increased. As a result, the jet propulsion personal watercraft will maintain the steering function because the amount of water commensurate with its rise is injected from the rear injection port.
[0010]
In this specification, when a signal indicating that the steering operation means is operated is obtained from the steering position detection sensor in a state where the throttle is turned OFF, the engine speed is temporarily increased to perform steering. Control that maintains the function is called “off-throttle / steering mode control”. Further, in this specification, the “OFF operation” of the throttle means an operation in which the throttle is operated to a “closed” side by a predetermined amount or more.
[0011]
The jet propulsion personal watercraft according to the second aspect of the present invention is a jet propulsion personal watercraft configured to inject water pressurized and accelerated by a water jet pump from a rear injection port and propel it by its reaction. In
A steering position detection sensor for detecting the steering state of the steering operation means, and an engine speed detection sensor;
When a signal indicating that the steering operation means is operated is obtained from the steering position detection sensor, the engine speed is equal to or less than a predetermined value.
The engine is characterized in that the engine speed is temporarily set to a predetermined value or more.
[0012]
Therefore, according to the jet propulsion personal watercraft configured as described above, when the steering operation unit is operated in a state where the throttle is turned OFF, the steering position detection sensor detects the operation, and the engine speed is a predetermined value. If the engine speed is below, the engine speed temporarily exceeds a predetermined value, and as a result, the jet propulsion watercraft injects an amount of water commensurate with its rise from the rear injection port. Will be maintained. In addition, when the engine speed is not less than the predetermined value, since a sufficient amount of water has already been injected from the rear injection port, control is not performed so that the engine speed becomes equal to or higher than the predetermined value. .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a jet propulsion personal watercraft according to an embodiment of the present invention will be specifically described with reference to the drawings, taking a small personal watercraft as an example.
[0014]
1 is a block diagram showing a control-related configuration of a jet propulsion personal watercraft according to an embodiment of the present invention, FIG. 2 is a flowchart showing control contents of components shown in the block diagram of FIG. 1, and FIG. 3 is used for control. 4 is an overall side view of a personal watercraft according to an embodiment of the present invention, FIG. 5 is a plan view of FIG. 4, FIG. 6 is a partially enlarged sectional view in the vicinity of the steering operation means of FIG. FIG. 8 is an exploded perspective view of the main part of the steering operation means, and FIG. 8 is a diagram showing the configuration shown in the block diagram of FIG. 1 in relation to an actual engine.
[0015]
4 and 5, A is a hull, and this hull A is composed of a hull H and a deck D covering the hull H, and a connection line connecting the hull H and the deck D all around is called a gunnel line G. In this embodiment, the gunnel line G is located above the waterline L of the personal watercraft.
[0016]
As shown in FIG. 5, a substantially rectangular opening 16 is formed on the upper surface of the hull A in a plan view extending in the longitudinal direction, slightly behind the center of the deck D, as shown in FIGS. Thus, a seat S for riding is disposed above the opening 16.
[0017]
The engine E is disposed in a space 20 having a “convex” cross section surrounded by the hull H and the deck D below the seat S.
The engine E is a multi-cylinder engine (three cylinders in this embodiment), and is mounted with the crankshaft 10b oriented in the longitudinal direction of the hull A as shown in FIG. The output end of the shaft 10b is connected to the pump shaft side of the water jet pump P to which the impeller 21 is attached via the propeller shaft 15 so as to be integrally rotatable. The outer periphery of the impeller 21 is covered with a pump casing 21C. Water taken from a water supply port 17 provided on the bottom surface of the personal watercraft is taken in via a water absorption passage and is added by a water jet pump P. It is configured so as to obtain a propulsive force by being discharged from the rear injection port 21K through the pump nozzle (spout part) 21R whose pressure and acceleration are reduced and the water flow cross-sectional area becomes smaller rearward.
[0018]
In FIG. 4, 21V is a stationary blade for rectification. 4 and 5, reference numeral 10 denotes a steering handle as steering operation means. By operating the handle 10 left and right, the steering nozzle 18 behind the pump nozzle 21R is swung left and right. When the water jet pump P is in operation, the boat can be steered in a desired direction.
[0019]
As shown in FIG. 4, a bowl-shaped reverse deflector 19 (FIG. 4) is provided above and below the steering nozzle 18 so as to be able to swing downward about a horizontally disposed swing shaft 19a. Reference) is arranged, and by swinging the deflector 19 to a lower position behind the steering nozzle 18, the water discharged backward from the steering nozzle 18 is turned forward to be moved backward.
[0020]
4 and 5, reference numeral 12 denotes a rear deck. The rear deck 12 is provided with an openable hatch cover 29 (see FIG. 5), and a small capacity storage box is formed below the hatch cover 29. Has been. 4 or 5, reference numeral 23 denotes a front hatch cover, and a box (not shown) for storing equipment and the like is provided below the hatch cover 23. Further, another hatch cover 25 is disposed above the front hatch cover 23 to form a two-layer hatch cover, and the hatch cover 25 has an opening (not shown) provided on the rear end face. The life jacket etc. can be stored in the inside.
[0021]
Incidentally, in the personal watercraft according to the embodiment of the present invention, as shown in FIGS. 6 and 7, the rotating shaft 10 </ b> A portion of the handle 10 includes a steering switch constituted by a proximity switch on the rotating side and the fixed side. A position detection sensor Sp is arranged. In this embodiment, the steering position detection sensor Sp is a sensor that is disposed when the permanent magnet 40 is disposed on a part of a disk-like member on the rotation side and is turned on when the permanent magnet 40 approaches in two places on the fixed side. 41 is formed. Further, as shown in FIG. 8, an engine speed detection sensor Se is disposed in the vicinity of the crankshaft Cr. In FIG. 8, 3 indicates an intake passage and 51 indicates a butterfly valve.
Although a specific position is not shown, a ship speed detection sensor (ship speed meter) Ss for detecting the ship speed of the small planing boat shown in FIGS. 8 and 1 is arranged.
As shown in FIG. 1, the steering position detection sensor Sp, the engine speed detection sensor Se, and the boat speed detection sensor Ss are connected to the engine control unit Ec by signal lines (electric wires), Signals detected by these sensors are transmitted to the engine control unit Ec.
The engine control unit Ec is connected to a fuel injection device Fe disposed in the cylinder head Hc of the engine E by a signal line (electric wire). The engine control unit Ec is connected to the ignition coil Ic by a signal line (electric wire).
The ignition coil Ic is connected to the ignition plug Ip by an electric wire (high voltage electric cord). In FIG. 8, 4 is a fuel tank, and 5 is a fuel booster pump.
[0022]
Thus, the jet propulsion personal watercraft according to the embodiment of the present invention configured as described above performs the off-throttle / steering mode control when the steering operation is performed as follows, and the throttle is turned off. The steering function can be maintained even when the vehicle is on. The control contents of the control program recorded in the memory of the computer built in the engine control unit Ec will be described below with reference to the flowchart of FIG.
That is, in the state where the small planing boat which is a jet propulsion planing boat is sliding, the rider moves the handle 10 of the small planing boat to the right or left by a predetermined angle (in this embodiment, the rotation angle is set to the left and right). When operated, the steering position detection sensor Sp detects the steering operation (step 1 (S1)) and transmits the signal to the engine control unit Ec.
Next, the engine control unit Ec detects the ship speed at that time from the ship speed detection sensor Ss (step 2 (S2)).
Next, the engine control unit Ec controls the time of the engine E to be controlled according to the table shown in FIG. 3 (a table in which the relationship between the ship speed, the delay time and the operation time is predetermined). The duration of the state in which the rotational speed is temporarily increased, that is, the time length (operation time) is determined (step 3 (S3)). That is, as shown in the table of FIG. 3, the “delay time” increases in proportion to the magnitude (speed) of the ship speed, and the “operation time t” increases (fastens) the ship speed. It is determined to be longer in proportion to Further, instead of the boat speed, the boat speed may be converted from the engine speed. However, in this case, the correct boat speed cannot be obtained only with the instantaneous engine speed, so the engine speed is continuously obtained as data, taking into account the inertia of the small planing boat, and based on that data. It is desirable to convert to ship speed.
Next, it is checked whether it is the timing to be controlled (step 4 (S4)). When the timing comes, the engine speed at that time is detected from the engine speed detection sensor Se, and the engine speed is detected. It is determined whether or not the number is equal to or less than a predetermined value (for example, 2500 rpm) (step 5 (S5)).
When the engine speed is less than or equal to a predetermined value, the off-throttle / steering mode control is started, and the fuel injection timing and the ignition timing are changed (in this embodiment, for example, the timing is advanced). Then, the engine E is temporarily raised to a predetermined rotational speed (step 6 (S6)). At this time, the control may be performed so as to change (for example, “increase”) the fuel injection amount together with the change of the timing. The predetermined number of revolutions to be temporarily raised is determined in view of the characteristics of the personal watercraft (turning characteristics or characteristics resulting from the hull form), etc., but may be appropriately determined to be, for example, 2500 rpm based on the characteristics. . Further, the value of the predetermined number of revolutions may be a value that is substantially equal to the value in step 5 above.
[0023]
Next, it is checked whether or not the operation time t determined by the above calculation has elapsed (step 7 (S7)). When the operation time t has elapsed, the fuel injection timing and ignition timing are returned to their original states (normal operation). (Step 8 (S8)), and the off / throttle / steering mode control is terminated. Therefore, as a result, the normal operation state is restored.
[0024]
By performing the above-described series of off-throttle / steering mode control, even if the throttle is turned off when the handle 10 is operated beyond a predetermined angle, the steering function is maintained.
[0025]
According to the jet propulsion personal watercraft configured as described above, the engine speed detection sensor Se and the boat speed detection sensor Ss are also provided in the conventional jet propulsion personal watercraft. Since the unit Ec is also provided, only the steering position detection sensor Sp consisting of a proximity switch is newly provided, and only the control program of the engine control unit Ec needs to be changed.
[0026]
Further, according to the jet propulsion type personal watercraft, control is performed so as to correspond to the boat speed, that is, to control a short delay time at a low speed and a longer delay time at a higher speed. As described above, in any case, the vehicle can turn while maintaining a preferable posture.
[0027]
By the way, in the said Example, in order to raise the engine E to a predetermined rotation speed, it has comprised so that both fuel injection timing and ignition timing may be changed, but in addition to these, fuel injection amount may be changed, Alternatively, only one of these may be performed.
[0028]
Also, the control to change the fuel injection timing and ignition timing by the ship speed detection sensor is executed with a tamming delay according to the ship speed at that time, but it should be performed at a constant timing regardless of the ship speed. Even so, the basic effects of the present invention can be obtained.
[0029]
Further, the “off-throttle / steering mode control” for temporarily increasing the engine speed may be configured not to be executed when the engine is in an idling region (for example, 800 to 2000 rpm). This configuration is a preferred embodiment in that the engine speed does not rise from the idling region when no extra driving force is required.
[0030]
In the control according to the above-described embodiment, the “off / throttle / steering mode control” is executed only at a predetermined engine speed under the control conditions. When the signal indicating that the steering wheel 10 has been operated is input at any engine speed, “off / throttle / steering mode control” is executed. When the engine speed is already equal to or greater than the engine speed to be increased when the “off-throttle / steering mode control” is executed, the “off-throttle / steering mode control” The configuration may be such that the control is ignored.
[0031]
In each of the above embodiments, the forward or backward movement is not particularly limited, but the present invention can be applied to either case.
[0032]
【The invention's effect】
According to the present invention, when the steering operation means is operated with the simple configuration and without increasing the weight by utilizing the equipment that has already been provided, the throttle opening degree is in the idling region state. Thus, it is possible to provide a jet propulsion type personal watercraft capable of maintaining the steering of the boat even when the amount of water jetted from the water jet pump is reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a control-related configuration of a jet propulsion personal watercraft according to an embodiment of the present invention.
FIG. 2 is a flowchart showing control contents of components shown in the block diagram of FIG. 1;
FIG. 3 is a table used for the control of FIG. 2;
FIG. 4 is an overall side view of a personal watercraft according to an embodiment of the present invention.
5 is an overall plan view of the personal watercraft shown in FIG. 4. FIG.
6 is a partially enlarged cross-sectional view of the vicinity of the steering in FIG. 4 showing the arrangement position and configuration of the steering position detection sensor.
7 is an exploded perspective view of the main part of the steering portion, showing the arrangement position of the steering position detection sensor shown in FIG. 6 and the configuration in the vicinity thereof. FIG.
FIG. 8 is a diagram showing the configuration of the control relationship shown in FIG. 1 in relation to an actual engine.
FIG. 9 is a schematic view showing a state from turning off the throttle of the small planing boat according to the present embodiment to turning, divided into low speed, medium speed, and high speed.
[Explanation of symbols]
P …… Water jet pump 21K …… Injection port E …… Engine Sp …… Steering position detection sensor

Claims (4)

In a jet-propelled planing boat configured to inject water pressurized and accelerated by a water jet pump from the rear injection port and propel it by its reaction,
A steering position detection sensor for detecting the steering state of the steering operation means ;
A control device that controls the number of revolutions of an engine that drives the water jet pump in response to a signal from the steering position detection sensor;
In a state where the throttle of the engine is being turned OFF , when a signal indicating that the steering operation means is being operated is obtained from the steering position detection sensor, the control device waits until a predetermined operation time has elapsed. The jet propulsion type personal watercraft is controlled so that the number of revolutions of the engine becomes a predetermined value or more. The jet-propelled planing boat
Further comprising an engine speed sensor over for detecting the rotational speed of the engine,
The control device is configured to detect the engine speed from the engine speed detection sensor and to perform the control when the engine speed at that time is equal to or less than a predetermined value. The jet propulsion planing boat according to claim 1 . The jet propulsion planing boat is
Further equipped with a ship speed detection sensor for detecting the ship speed,
3. The jet according to claim 1, wherein the control device is configured to control by changing a timing at which the control is started in accordance with a ship speed detected from the ship speed sensor. 4. Propulsion planing boat. The jet propulsion planing boat is
Further equipped with a ship speed detection sensor for detecting the ship speed,
3. The jet according to claim 1, wherein the control device is configured to control the time length of the predetermined operation time by changing the length of the predetermined operation time in accordance with a value from a ship speed sensor. Propulsion planing boat.

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