JP2002240793A - Fuel pump energizing control device for water jet propulsion boat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem wherein the startability of an engine is bad because a fuel pressure is low when starting the engine because a fuel pump is energized after a start switch is turned on and the engine starts cranking, in a water jet propulsion boat. SOLUTION: The water jet propulsion boat for starting the engine when the start switch is turned on in a state of a lanyard inserted into a stop switch and stopping the engine when the lanyard comes off from the stop switch is provided with a control device for performing a control to energize at least the fuel pump when inserting the lanyard into the stop switch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel pump energization control device for a water jet propulsion boat.

[0002]

2. Description of the Related Art A water jet propulsion watercraft is propelled by injecting a jet generated by an impeller of a jet propulsion device driven by an engine from an injection nozzle backward.

[0003] In the water jet propulsion boat as described above, the engine starts when the start switch is turned on with the other end of the lanyard having one end attached to the pilot inserted into the stop switch. . Then, the engine stops when the other end of the lanyard comes off the stop switch due to a drop of water by the pilot or the like.

In an automobile or the like, since the fuel pump is energized when the main switch is turned on before the engine is started, the fuel pressure rises when the engine is started, so that the startability of the engine is good.

[0005]

However, the water jet propulsion boat does not have the main switch as described above.
Since the fuel pump is energized after the start switch is turned on and the engine starts cranking, there is a problem that the startability of the engine is poor because the fuel pressure at the start of the engine is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide a fuel jet energization control device for a water jet propulsion boat which can improve the startability of an engine. .

[0007]

In order to solve the above-mentioned problems, the present invention provides a lanyard in which the engine is started when a start switch is turned on while the other end of the lanyard is inserted into a stop switch, and the lanyard is turned on. In a water jet propulsion boat in which the engine is stopped when it comes off from the stop switch, when the lanyard is inserted into the stop switch, the water jet propulsion boat is provided with a control device that controls at least to energize the fuel pump. The present invention provides a water jet propulsion boat fuel pump control device.

According to the present invention, when the lanyard is inserted into the stop switch, control is performed so that at least the fuel pump is energized. Therefore, when the start switch is turned on and the engine starts cranking, the fuel pressure is increased. The startability of the engine is improved. In addition, just by performing the normal operation of inserting the lanyard into the stop switch, the control to increase the fuel pressure while turning on the start switch is automatically terminated, so a new main switch is provided to the user Since there is no need for unfamiliar operation of operation, the user has no sense of discomfort.

According to a second aspect of the present invention, by the control device,
If the configuration is such that the energization is stopped after a predetermined time has elapsed with the engine stopped, even if the lanyard is left for a long time with the engine stopped, the lanyard is inserted into the stop switch, Since the energization is stopped after a predetermined time (for example, 5 minutes) has elapsed, a warning lamp is turned on during this time to urge the lanyard to be removed from the stop switch, and it is possible to suppress unnecessary energization to the fuel pump. .

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, a water jet propulsion boat 1
The hull member 2 and the deck member 3 are joined at their peripheral edges to form a hull 4, and an engine room 5 formed at a substantially central position in the front-rear direction inside the hull 4 has four cycles. A four-cylinder engine 6 is installed.
A fuel tank 7 is installed in front of the engine room 5, and a jet propulsion device 10 is installed in a pump room 9 partitioned by a bulkhead 8 behind the engine room 5.

A steering handle 12 is provided at a front upper portion of the deck member 3, and a seat table 13 is provided at a rear upper portion of the deck member 3. 14 is detachably attached. In addition, 15a and 15b are ventilation ducts which connect the engine room 5 to the atmosphere.

[0013] An impeller shaft 18 is connected to a crankshaft 16 of the engine 6 via a coupling 17 and transmission means having a fixed reduction ratio. The impeller shaft 18 is connected to an impeller housing 10 a of the jet propulsion device 10. An impeller (not shown) housed in the impeller housing 10a is provided with an injection nozzle 19a at the rear end of the impeller housing 10a, and a deflector 19b is mounted on the injection nozzle 19a.

Then, the jet generated by the impeller of the jet propulsion device 10 driven by the engine 6 is injected into the injection nozzle 19.
a, the hull 4 is propelled by jetting rearward, and the occupant straddling the straddle-type seat 14 operates the steering handle 12 to deflector 19 of the jet nozzle 19a.
By turning b to the left and right, the vehicle is turned.

The engine 6 is mounted on the hull member 2 so that the crankshaft 16 extends in the front-rear direction of the hull 4.
On the port side of the engine 6, an intake pipe 21 for each cylinder connected to an intake port of a cylinder head and an intake chamber 22 connected to an upstream end of the intake pipe 21 are provided. Is provided with an intake silencer 23, and the intake silencer 23 and the intake chamber 22 are connected via an intake duct 24.

An exhaust pipe 25 connected to the exhaust port of the cylinder head is provided on the starboard side of the engine 6. The exhaust pipe 25 extends through the bulkhead 8 while extending rearward of the engine 6. Connected to the water lock 26 in the pump room 9
6 is connected to the outside of the boat.

An engine control unit (ECU ... control unit) 28 is installed above the bulkhead 8 on the engine room 5 side.

As shown in detail in FIG. 2A, the steering handle 12 has a large diameter portion 3 near the left grip 30.
The large diameter portion 31 is provided with a stop switch 32 for stopping the engine and a start switch 33 for starting the engine.

As shown in FIG. 2B, the lanyard 34
Is a rope 34a and one end 3 attached to the pilot's wrist.
4b and the other end 3 inserted into the stop switch 32
4c. When the start switch 33 is pressed to turn on the engine 6 in a state where the other end 34c is inserted into the stop switch 32 (the state shown in FIG. 2A), the other end 34c of the lanyard 34 is turned on. The engine control unit 28 controls the engine 6 so that the engine 6 stops when the stop switch 32 is disengaged.

The lanyard 34 and the stop switch 32 are, as shown in FIG. 3B, when the other end 34c of the lanyard is inserted into the stop switch 32 from the side (see arrow a). Stop switch 32
The upper contact 32a rises (see arrow b) and the lower contact 3
By moving away from 2b, the stop switch 32 is turned off, and the engine 6 starts when the start switch 33 is pressed and turned on while the stop switch 32 is off.

As shown in FIG. 3A, when the other end 34c of the lanyard 34 comes off the stop switch 32 to the side (see arrow c), the stop switch 3 is turned off.
The lower switch 32 is turned on (see arrow d) and comes into contact with the lower contact 32b, so that the stop switch 32 is turned on, and the engine 6 is stopped with the stop switch 32 turned on. Become.

As shown in FIG.
As shown in (b), when the other end 34c of the lanyard is inserted into the stop switch 32 from the side (see arrow a), the lower contact 35b rises (see arrow b) and contacts the upper contact 35a. 3A, and when the other end 34c of the lanyard comes off the stop switch 32 to the side (see arrow c) as shown in FIG. 3A, the lower contact 35b is lowered (arrow). d), and a power switch 35 that is turned off by moving away from the upper contact 35a is provided.

As shown in FIG. 4, a main relay 38 and a power switch 35 are connected to a power supply (battery) 37 in the engine control unit 28. When the power switch 35 is turned on, a coil 38a
Is energized, the main relay 38 is turned on, and the coil 43a
Is energized and the fuel pump relay 43 is turned on to energize the fuel pump 39 and the fuel injection valve 4
0 and the ignition plug 41 are energized.

The engine control unit 28
Is provided with a timer 28a for the main relay 38, and after a predetermined time (for example, 5 minutes) has elapsed with the engine 6 stopped, the coil 38a is demagnetized from the main relay control line to turn off the main relay 38. As a result, the coil 43a is demagnetized, the fuel pump relay 43 is turned off, and the power supply to the fuel pump 39 is stopped.
Fuel injection valve 40, spark plug 41 and warning lamp 42
Is stopped.

The water jet propulsion boat 1 constructed as described above
The energization control for the fuel pump 39 in the engine control unit 28 will be described based on the flowchart of FIG.

When the operator of the water jet propulsion boat 1 inserts the other end 34c of the lanyard 34 into the stop switch 32 (see FIG. 3B), the stop switch 32 is turned off and the power switch 35 is turned on at the same time. . And
In step S1, it is determined whether or not the power switch 35 is on. If YES (on), the main relay 38 is turned on in step S2, and the fuel pump 39 is energized by turning on the fuel pump relay 43. At the same time, the fuel injection valve 40, the ignition plug 41, and the warning lamp 42 are energized.

When the start switch 33 is turned on in this state, the engine 6 starts. However, after inserting the other end 34c of the lanyard 34 into the stop switch 32, there is a sufficient time before the start switch 33 is turned on. If there is, since the fuel pump 39 is energized, when the start switch 33 is turned on and the engine starts cranking, the fuel pressure is increased, so that the startability of the engine 6 is improved.

Further, the control for increasing the fuel pressure while the start switch 33 is turned on is automatically terminated only by performing a normal operation of inserting the other end 34c of the lanyard 34 into the stop switch 32. An unfamiliar operation of providing a new main switch and letting the user operate the switch becomes unnecessary, so that the user has no discomfort at all.

Then, in step S3, it is determined whether or not the engine 6 is rotating. If YES, the fuel pump relay 43 is continued to be turned on together with the main relay 38 in step S4, and steps S3 and S4 are repeated. .

On the other hand, when the operator of the water jet propulsion boat 1 inserts the other end 34c of the lanyard 34 into the stop switch 32 and does not turn on the start switch 33 (that is, when the engine 6 is stopped), the main relay 3
When the fuel pump 39 is turned on and the fuel pump relay 43 is turned on, the fuel pump 39 is energized, and the fuel injection valve 40, the spark plug 41, and the warning lamp 42 are energized (see step S2). In such a case, NO is determined in step S3.
After a predetermined time (for example, 5 minutes) elapses in step S5, the coil 38a is demagnetized from the main relay control line to turn off the main relay 38.
3a, the fuel pump relay 43 is turned off, the power supply to the fuel pump 39 is stopped, and the fuel injection valve 4a is turned off.
1. Power supply to the ignition plug 41 and the warning lamp 42 is stopped.

Thus, with the engine 6 stopped, the other end 34c of the lanyard 34 is moved to the stop switch 32.
Even if you leave it for a long time with it plugged in,
Since the power supply is stopped after a predetermined time (for example, 5 minutes) has elapsed, the warning lamp 42 is turned on during this time to urge the other end 34c of the lanyard 34 to be pulled out from the stop switch 32, and the fuel pump 39 Useless energization can be suppressed.

In the above embodiment, the stop switch 32
The power switch 35 is provided separately, but when the other end 34c of the lanyard 34 is disengaged from the stop switch 32 and the power switch 35 is turned off, the main relay 38 is turned off and the fuel pump relay 43 is also turned off. When the power supply to the pump 39 is stopped, the fuel injection valve 4
Since the power to the ignition plug 41 and the warning lamp 42 is stopped, the engine 6 is stopped. Therefore, the stop switch 32 may not be provided.

In the above embodiment, the power supply to the engine control unit 28 is turned on when the power switch 35 is turned on to energize the fuel pump 39. However, when the power switch 35 is turned on, only the fuel pump 39 is energized. You may do it.

[0034]

As is clear from the above description, according to the present invention, when the lanyard is inserted into the stop switch, at least the fuel pump is controlled so that the fuel pump is energized. Since the fuel pressure is rising when starting the engine, the startability of the engine is improved. In addition, just by performing the normal operation of inserting the lanyard into the stop switch, the control to increase the fuel pressure while turning on the start switch is automatically terminated, so a new main switch is provided to the user Since there is no need for unfamiliar operation of operating, there is no discomfort for the user.

Further, if the power supply is controlled so as to be stopped after a predetermined time has elapsed while the engine is stopped (claim 2), the lanyard is inserted into the stop switch while the engine is stopped and the power supply is stopped. Even if it is left for a while, the power supply is stopped after the elapse of the predetermined time.In this period, the warning lamp is turned on to urge the removal of the lanyard from the stop switch, and unnecessary power supply to the fuel pump is performed. It can be suppressed.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of a main part of a water jet propulsion boat according to the present invention.

FIG. 2A is a perspective view of a main part of a steering wheel, and FIG.
Is a perspective view of a lanyard.

FIG. 3 shows a stop switch and a power switch,
(A) is a side view when the lanyard is removed, and (b) is a side view when the lanyard is inserted.

FIG. 4 is a configuration diagram of a control circuit.

FIG. 5 is a flowchart of fuel pump energization control.

[Explanation of symbols]

 Reference Signs List 1 water jet propulsion boat 6 engine 12 steering handle 28 engine control unit (control device) 32 stop switch 33 start switch 34 lanyard 34b one end 34c other end 35 power switch 38 main relay 39 fuel pump 43 fuel pump relay

Claims (2)

[Claims] 1. A water jet propulsion boat in which an engine is started when a start switch is turned on with a lanyard inserted into a stop switch, and the engine is stopped when the lanyard comes off from the stop switch. , When the above lanyard is inserted into the stop switch,
A fuel pump control device for a water jet propulsion boat, comprising: a control device that controls at least power supply to a fuel pump. 2. The control device according to claim 1, wherein the control device controls the power supply to be stopped after a predetermined time has elapsed with the engine stopped.