JP4349729B2 - Jet propulsion 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 called 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, the hull is generally propelled by injecting water sucked from a water suction port provided on the bottom of the boat by pressurizing and accelerating it with a water jet pump to the rear from the injection port. .
[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]
In the case of reverse driving, the reverse deflector disposed so as to be movable up and down behind the steering nozzle is lowered to change the direction of the water flow injected backward from the steering nozzle to the front, It is configured to reverse. In some planing boats, when moving backward, a water flow along the transom board is formed from the opening opened to the side of the reverse deflector to reduce the water pressure in the rear area of the boat, and Some are configured to do so.
[0005]
Therefore, in the case of a jet propulsion type personal watercraft having the above-described configuration, the boat is turned when the throttle is closed to near full close and the amount of water injected from the water jet pump decreases in both forward and reverse travel. The thrust that can be used for this purpose (thrust that can be used for steering) is also reduced, and the ability to steer the boat is reduced until the throttle is opened again.
[0006]
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).
[0007]
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.
[0008]
The present invention has been made in view of the present situation, and is a jet propulsion type sliding that can maintain the steering of a boat even when the amount of water injection from the water jet pump is decreased by operating the throttle OFF. It is an object of the present invention to provide a jet propulsion type personal watercraft that can be steered appropriately when moving forward and backward, and that does not increase in weight.
[0009]
[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,
In the jet propulsion type personal watercraft according to the first aspect of the invention, when the water pressurized and accelerated by the water jet pump is injected from the rear injection port and propelled by the reaction, and the steering is turned OFF when the steering is turned off, In the jet propulsion planing boat configured to detect the steering of the steering and the throttle OFF operation and temporarily increase the engine speed to maintain the steering function when the throttle is OFF,
Place a reverse operation detection sensor to detect reverse operation,
When the steering and the throttle OFF operation are detected, and further when a signal indicating that the reverse operation has been performed is obtained from the reverse operation detection sensor,
It is characterized by temporarily increasing the engine speed.
[0010]
Thus, according to the jet propulsion type personal watercraft configured as described above, when the throttle is turned OFF, the steering is operated and the reverse operation is performed, the steering and the throttle OFF operation are detected, and the reverse operation detection sensor. When the reverse operation is detected, the engine speed temporarily rises, the amount of water corresponding to the rise is injected from the rear injection port, and the water is changed forward by the deflector. Even if the throttle is turned off, the steering function is maintained.
[0011]
Further, in the jet propulsion personal watercraft according to the first aspect of the present invention, if a condition that the ship speed is equal to or lower than a predetermined speed is added as a condition for temporarily increasing the engine speed, the embodiment is further implemented. It becomes a preferable form as a form.
[0012]
In the jet propulsion personal watercraft according to the first aspect of the present invention, as a condition for temporarily increasing the engine speed, the engine speed may be in an idle region (the engine speed slightly higher than the idling speed from the idling speed). If the condition that it is the same as in the present specification is added, it becomes a preferable embodiment as an embodiment.
In the jet propulsion type personal watercraft, the idle region of the engine speed may be a region of 2500 rpm or less.
[0013]
In the jet propulsion personal watercraft according to the first aspect of the present invention, a preferred embodiment is provided in which the reverse operation detection sensor is a proximity switch disposed at or near the operating portion of the reverse operation lever.
[0014]
In the jet propulsion type personal watercraft according to the second aspect of the invention, when the water pressurized and accelerated by the water jet pump is injected from the rear injection port and propelled by the reaction, and the steering is turned OFF when the steering is turned off, In the jet propulsion planing boat configured to detect the steering of the steering and the throttle OFF operation and temporarily increase the engine speed to maintain the steering function when the throttle is OFF,
While arranging reverse operation detection sensor to detect reverse operation,
A throttle opening detection sensor for detecting the throttle OFF operation, and a steering position detection sensor for detecting the steering state of the steering,
A signal indicating that the steering position detection sensor is steered at a predetermined angle or more, a signal indicating that the throttle opening operation is performed from the throttle opening detection sensor, and a reverse operation are performed from the reverse operation detection sensor. When a signal indicating that
Judging whether the boat speed is below the predetermined value,
When the boat speed is below a predetermined level, the engine speed is temporarily increased to improve the steering ability when the throttle is turned off during reverse travel.
When a signal indicating that the steering position detection sensor is steered at a predetermined angle or more and a signal indicating that the throttle is turned off are obtained from the throttle opening detection sensor,
Judging whether the boat speed is below the predetermined value,
When the boat speed is less than or equal to a predetermined value, the engine speed is temporarily increased to improve the steering ability when the throttle is turned off during forward travel.
[0015]
Thus, according to the jet propulsion type personal watercraft configured as described above, when the throttle is turned OFF, the steering is operated and the reverse operation is performed, the steering and the throttle OFF operation are detected, and the reverse operation detection sensor. Detects the reverse operation and determines whether the ship speed at that time is less than or equal to a predetermined value. If it is less than the specified value, the engine speed temporarily increases and the amount corresponding to the increase from the rear injection port Since the water is injected to the reverse side by the deflector, the steering function is maintained even if the throttle is turned off during reverse.
On the other hand, when the steering is operated with the throttle turned OFF, the throttle opening detection sensor and the steering position detection sensor detect these states, and whether or not the ship speed at that time is below a predetermined speed. Judgment
When the boat speed is below the predetermined speed, the engine speed temporarily increases, and an amount of water commensurate with the increase is injected from the rear injection port in the steered direction. Even if an OFF operation is performed, the steering function is maintained.
[0016]
In the jet propulsion personal watercraft according to the second aspect of the present invention, it is preferable that the engine rotational speed for temporarily increasing the engine rotational speed is 2500 to 3500 rpm when the small personal watercraft is used. This is an embodiment.
[0017]
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.
[0018]
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, and FIG. FIG. 4 is an overall side view of the personal watercraft according to the embodiment of the present invention, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is the vicinity of the steering of FIG. FIG. 7 is an exploded perspective view of the essential part of the steering part, FIG. 8 is a diagram showing the configuration shown in the block diagram of FIG. 1 in relation to an actual engine, and FIG. 9 is used for control. It is a table to be.
[0019]
4 or 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 on the entire circumference is called a gunnel line G. In this embodiment, the gunnel line G is located above the waterline L of the personal watercraft.
[0020]
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.
[0021]
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 the water inlet 17 provided on the bottom surface of the small planing boat is taken in through the water intake passage and is added by the water jet pump P. It is configured to obtain a propulsive force through pressure / acceleration and discharge from the rear end injection port 21K through a pump nozzle (spout part) 21R whose water flow cross-sectional area becomes smaller as it goes backward.
[0022]
Moreover, 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.
[0023]
As shown in FIG. 4, a bowl-shaped reverse deflector 19 is disposed above and behind the steering nozzle 18 so as to be able to swing downward about a horizontally disposed swing shaft 19a. By operating a lever Lr for reverse operation, which will be described later, the deflector 19 is swung to a lower position behind the steering nozzle 18 via the cable Cc (see FIG. 3), thereby moving backward from the steering nozzle 18. It is configured to be able to move backward by turning the water discharged to the front.
[0024]
4 and 5, in the vicinity of the handle 10, in this embodiment, on the right side of the handle 10 (on the right side when the rider straddles the seat S) and slightly below, A lever Lr for reverse operation for switching from forward to reverse is arranged, and this lever Lr is provided with a lock release button Rb as shown in an enlarged view in FIG. The deflector 19 is positioned at the rear position of the steering nozzle 18 via the cable Cc by turning in the direction shown by the arrow r about the support shaft, and can be switched from forward to reverse.
[0025]
4 and 5, reference numeral 12 denotes a rear deck. The rear deck 12 is provided with an openable / closable hatch cover 29, and a small-capacity storage box is formed below the hatch cover 29. 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.
[0026]
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 by the thing of the structure which has arrange | positioned.
Further, as shown in FIG. 8, a throttle opening degree detection sensor Sb for detecting the throttle OFF operation is disposed in the vicinity of the butterfly valve 51 disposed in the intake passage 3 of the engine E. .
Further, as shown in FIG. 8, an engine speed detection sensor Se is disposed in the vicinity of the crankshaft Cr.
Further, as shown in an enlarged view in FIG. 3, the reverse operation detection sensor Sr configured by a proximity switch for detecting the reverse operation is provided at the operating portion (rotating portion) of the reverse operation lever Lr. Is arranged. Further, the reverse operation detection sensor Sr may be configured by a proximity switch provided on a cable for reverse operation instead of the above configuration, or may be provided in an operating portion of the deflector 19. However, the reverse operation detection sensor Sr is preferably provided in the hull from the viewpoint of rust prevention.
By the way, although a specific position is not shown, a boat speed detection sensor (ship speed meter) Ss for detecting the boat speed of the small planing boat shown in FIGS. 8 and 1 is arranged. The ship speed detection sensor Ss may be any place that is always submerged.
As shown in FIG. 1, the steering position detection sensor Sp, the throttle opening detection sensor Sb, the engine speed detection sensor Se, the boat speed detection sensor Ss, and the reverse operation detection sensor Sr are respectively connected by electric wires. It is connected to the engine control unit Ec, and is configured to transmit signals detected by these sensors 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) as shown in FIG. 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.
[0027]
Thus, the jet propulsion personal watercraft according to the embodiment of the present invention configured as described above controls the off-throttle / steering mode control (engine speed is temporarily changed when the throttle is turned off as follows. (Same as in this specification), and the steering function can be maintained. 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, when the rider turns off the throttle of the small planing boat while the small planing boat which is a jet propulsion planing boat is sliding, the throttle opening detection sensor Sb detects the off operation (step 1 ( S1)), and transmits the signal to the engine control unit Ec.
In such a state, when the rider operates the handle 10 to the right or left by a predetermined angle (in this embodiment, the rotation angle is about 20 degrees to the left and right respectively), the steering position detection sensor Sp is The steering operation is detected (step 2 (S2)), and the signal is transmitted to the engine control unit Ec.
Next, the engine control unit Ec checks whether or not the reverse operation lever Lr has been operated, that is, whether or not a signal indicating that the lever Lr has been operated is input from the reverse operation detection sensor Sr (step 3). (S3)).
Here, when the signal indicating that the lever Lr has been operated is input from the reverse operation detection sensor Sr, the engine control unit Ec determines that it is in the reverse mode, and based on the signal from the boat speed detection sensor Ss. Then, it is checked whether or not the ship speed at that time is equal to or lower than a predetermined speed, that is, in the case of this embodiment, for example, whether it is equal to or lower than 8 km / h (step 4 (S4)). In the configuration of Step 4, instead of checking the ship speed, the engine speed may be converted into the ship speed. However, when converting the engine speed to the ship speed, the correct ship speed cannot be obtained by the instantaneous engine speed alone. It is desirable to convert the ship speed based on the data. For example, when the engine speed is used instead of the ship speed, a substantially proportional engine speed is obtained as a detected value, that is, a signal from the engine speed detection sensor Se is obtained, and the signal is used to It may be configured to check whether the engine speed is equal to or lower than a predetermined speed, for example, whether it is equal to or lower than 2500 rpm. If the engine speed is set to check whether or not the engine speed is equal to or less than the predetermined speed instead of the ship speed, in view of the characteristics of the personal watercraft (turning characteristics or characteristics resulting from the hull form), etc. In the embodiment, it is set to 2500 rpm, but it may be appropriately determined to be a set value (for example, 2000 to 3500 rpm).
When the boat speed is 8 km / h or less, the off-throttle / steering mode control is started and the fuel injection timing and the ignition timing are changed (in this embodiment, for example, these timings are changed to “ The engine E is temporarily raised to a predetermined number of revolutions (step 5 (S5)). 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.
[0028]
Next, it is checked whether or not a preset operation time t1 (for example, 2 seconds) has elapsed (step 7 (S6)), and when the operation time t has elapsed, the fuel injection timing and ignition timing are returned to their original states. Returning to (normal operation state) (step 10 (S10)), the off / throttle / steering mode control is terminated. Therefore, as a result, the normal operation state is restored.
[0029]
On the other hand, when the signal indicating that the lever Lr has been operated is not input from the reverse operation detection sensor Sr in Step 3, the engine control unit Ec determines that the vehicle is in the forward mode and proceeds to Step 7 (S7). . In step 7, the engine control unit Ec determines whether or not the ship speed at that time is below a predetermined speed based on a signal from the ship speed detection sensor Ss, that is, in this embodiment, for example, 8 km / h or less. (Step 7 (S7)). In the configuration of step 7, as in the case of step 4, instead of checking the boat speed, the engine speed may be converted into the boat speed.
When the boat speed is 8 km / h or less, the off-throttle / steering mode control is started and the fuel injection timing and the ignition timing are changed (in this embodiment, for example, these timings are changed to “ The engine E is temporarily raised to a predetermined number of revolutions (step 8 (S8)). 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.
[0030]
Next, it is checked whether or not a preset operation time t1 (for example, 2 seconds) has elapsed (step 9 (S9)). When the operation time t has elapsed, the fuel injection timing and the ignition timing are returned to the original state. Returning to (normal operation state) (step 10 (S10)), the off / throttle / steering mode control is terminated. Therefore, as a result, the normal operation state is restored.
[0031]
By performing the above-described series of off-throttle / steering mode control, the steering function is maintained even when the throttle is turned off.
[0032]
According to the jet propulsion personal watercraft configured as described above, the throttle opening detection sensor Sb, the engine speed detection sensor Se, and the boat speed detection sensor Ss are also provided in the conventional jet propulsion personal watercraft. In addition, since the engine control unit Ec is also provided, only the steering position detection sensor Sp and reverse operation detection sensor Sr simply including a proximity switch are newly provided, and only the control program of the engine control unit Ec is changed. do it.
[0033]
Further, according to the jet propulsion type personal watercraft, appropriate off-throttle / steering mode control can be performed during forward and reverse travel.
[0034]
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.
[0035]
【The invention's effect】
According to the jet propulsion type personal watercraft according to the present invention, it is possible to maintain the steering of the boat even when the throttle is turned OFF and the amount of water jet from the water jet pump is reduced. Steering suitable for each of them can be performed, and it can be simply implemented structurally without increasing the weight.
In addition, the present invention can be carried out by making maximum use of the equipment already provided.
[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 perspective view showing a lever for reverse operation.
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.
[Explanation of symbols]
P …… Water jet pump 21K …… Injection port E …… Engine Sr …… Reverse operation detection sensor Sp …… Steering position detection sensor Sb …… Throttle opening detection sensor

Claims (7)

Water pressurized and accelerated by a water jet pump is injected from the rear injection port and propelled by its reaction. When steering is performed and the throttle is turned OFF, the steering and the throttle OFF operation are detected and temporarily In a jet propulsion planing boat configured to maintain the steering function when the throttle is turned off by increasing the engine rotational speed,
Place a reverse operation detection sensor to detect reverse operation,
When the steering and the throttle OFF operation are detected, and further when a signal indicating that the reverse operation has been performed is obtained from the reverse operation detection sensor,
A jet-propelled planing boat characterized by temporarily increasing the engine speed. 2. The jet propulsion personal watercraft according to claim 1, wherein the condition for temporarily increasing the rotational speed of the engine is when the boat speed is equal to or lower than a predetermined speed. The jet propulsion personal watercraft according to claim 1, wherein the engine speed is in an idling region as a condition for temporarily increasing the engine speed. The jet propulsion personal watercraft according to claim 3, wherein the idle region of the engine speed is a region of 2500 rpm or less. The jet propulsion type personal watercraft according to any one of claims 1 to 4, wherein the reverse operation detection sensor is a proximity switch arranged at or near the operating portion of the reverse operation lever. The water pressurized and accelerated by the water jet pump is injected from the rear injection port and propelled by its reaction, and when steering is turned off, the steering of the steering and the turning off of the throttle are detected, In a jet propulsion planing boat configured to maintain the steering function when the throttle is turned off by temporarily increasing the engine speed,
While arranging reverse operation detection sensor to detect reverse operation,
A throttle opening detection sensor for detecting the throttle OFF operation, and a steering position detection sensor for detecting the steering state of the steering,
A signal indicating that the steering position detection sensor is steered at a predetermined angle or more, a signal indicating that the throttle opening operation is performed from the throttle opening detection sensor, and a reverse operation are performed from the reverse operation detection sensor. When a signal indicating that
Judging whether the boat speed is below the predetermined value,
When the boat speed is below a predetermined level, the engine speed is temporarily increased to improve the steering ability when the throttle is turned off during reverse travel.
When a signal indicating that the steering position detection sensor is steered at a predetermined angle or more and a signal indicating that the throttle is turned off are obtained from the throttle opening detection sensor,
Judging whether the boat speed is below the predetermined value,
A jet-propelled planing boat characterized in that when the boat speed is below a predetermined value, the engine speed is temporarily increased to improve the steering ability when the throttle is turned off during forward travel. The jet propulsion personal watercraft according to any one of claims 1 to 6, wherein the rotational speed of the engine that temporarily increases the rotational speed of the engine is 2500 to 3500 rpm.

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