US20040229522A1 - Jet propulsion boat - Google Patents

Jet propulsion boat Download PDF

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Publication number
US20040229522A1
US20040229522A1 US10/827,925 US82792504A US2004229522A1 US 20040229522 A1 US20040229522 A1 US 20040229522A1 US 82792504 A US82792504 A US 82792504A US 2004229522 A1 US2004229522 A1 US 2004229522A1
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US
United States
Prior art keywords
engine
water jet
engine speed
turbocharger
controller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/827,925
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English (en)
Inventor
Mamoru Uraki
Hideki Sugiyama
Masahiko Tsuchiya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Assigned to HONDA MOTOR CO., LTD. reassignment HONDA MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SUGIYAMA, HIDEKI, TSUCHIYA, MASAHIKO, URAKI, MAMORU
Publication of US20040229522A1 publication Critical patent/US20040229522A1/en
Priority to US11/226,098 priority Critical patent/US7048598B2/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type

Definitions

  • the present invention relates to a boat that is propelled by jetting pressurized and accelerated water through a jet nozzle.
  • a water jet pump is operated based upon the practical target number of revolutions and the actual number of revolutions by calculating the actual number of revolutions of a water jet pump and the cavitation limit number of revolutions showing the limit of the occurrence of cavitation corresponding to the number of revolutions of the pump and selecting either smaller one of the cavitation limit number of revolutions or the target number of revolutions as the practical target number of revolutions when the target number of revolutions of the water jet pump is input.
  • turbocharger power booster
  • jet propulsion boat a water jet driven personal water craft
  • a turbocharger power booster
  • the flow velocity of a stream flowing in a duct also similarly rapidly rises. This causes a rapid decrease in hydraulic pressure in the duct.
  • the hydraulic pressure exceeds saturated vapor pressure, bubbles (cavities) are formed at ordinary temperature thereby resulting in cavitation.
  • FIG. 6 summarizes this problem.
  • TH throttle valve
  • ENG engine speed NE accordingly rises.
  • the target boost pressure of the turbocharger also rapidly rises according to the rapid rise of the engine speed and engine speed further rapidly rises.
  • cavitation occurs and results in irregular engine speed or hunting. (See a part A in FIG. 6).
  • the invention is made to prevent such a situation.
  • the object is to provide a jet propulsion boat that enables preventing hunting by preventing cavitation.
  • the invention relates to a jet propulsion boat that jets water pressurized and accelerated by a water jet pump from a rear jet nozzle and is propelled by its reaction.
  • the jet propulsion boat includes a power booster turbocharger that can be controlled if the rate of the rise of engine speed is a predetermined value or more.
  • FIG. 1 is a side view a part of which is cut out showing a jet propulsion boat equivalent to this embodiment.
  • FIG. 2 is a plan showing the same jet propulsion boat.
  • FIG. 3 is a schematic perspective view mainly showing an engine and a turbocharger.
  • FIG. 4 is a graph mainly showing the variation in time of engine speed.
  • FIG. 5 is a flowchart showing the flow of a boost pressure control process.
  • FIG. 6 is a graph showing the variation in time of the engine speed of a conventional type.
  • FIG. 1 is a side view a part of which is cut out showing a jet propulsion boat equivalent to this embodiment and
  • FIG. 2 is a plan showing the same jet propulsion boat.
  • the jet propulsion boat 10 otherwise commonly known as a personal water craft, is a saddle-type small-sized boat, a crew sits on a seat 12 on the body 11 , and the output of an engine 20 is adjusted by gripping and operating a steering handlebar 13 with a throttle lever and adjusting an opening of a throttle valve (not shown) of the engine 20 .
  • the body of the boat 11 has floating structure acquired by bonding a hull 14 and a deck 15 and forming space 16 inside.
  • the engine 20 is mounted above the hull 14 and a water jet pump 30 as propelling means driven by the engine 20 is provided to the rear of the hull 14 .
  • the water jet pump 30 is provided with an impeller 32 arranged in a duct 18 extended from an intake 17 open to the bottom to a deflector 38 via an exhaust nozzle 31 open to the rear end of the body, and a drive shaft 22 for driving the impeller 32 is coupled to the output shaft 21 of the engine 20 via a coupler 21 a.
  • the number of revolutions of the engine 20 that is, propelling force by the water jet pump 30 is operated by the turning operation of the throttle lever 13 a (see FIG. 2) of the steering handlebar 13 .
  • the deflector 38 is linked with the steering handlebar 13 via operating wire not shown, is turned by the operation of the handlebar 13 and hereby, a course of the body 11 can be changed.
  • FIG. 3 is a schematic perspective view mainly showing the engine 20 .
  • the engine 20 is a DOHC-type in-line four-cylinder dry sump-type four-cycle engine and its crankshaft (see the output shaft 21 shown in FIG. 1) is arranged along the longitudinal direction of the body 11 .
  • a surge tank 41 and an inter-cooler 22 are connected and arranged on the left side of the engine 20 in the traveling direction F of the body 11 and an exhaust manifold 23 is arranged on the right side of the engine 20 .
  • a turbocharger 24 for feeding compressed intake air to the engine 20 is arranged at the back of the engine 20 and an air cleaner case 40 for taking new air in the turbocharger 24 via a pipe 25 is arranged in front of the engine 20 .
  • An exhaust outlet of the exhaust manifold 23 (see FIG. 2) is connected to a turbine of the turbocharger 24 .
  • the inter-cooler 22 is connected to a compressor of the turbocharger 24 via a pipe 22 a and the surge tank 41 is connected to the inter-cooler 22 via a pipe 21 b. Therefore, after new air from the air cleaner case 40 is supplied to the turbocharger 24 via the pipe 25 , is compressed in its compressor and is supplied and cooled to/in the inter-cooler 22 via the pipe 22 a, the new air is supplied to the engine 20 via the surge tank 41 .
  • Exhaust gas which fulfills the role of turning the turbine of the turbocharger 24 is exhausted into a water muffler 60 via a first exhaust pipe 51 , a back flow preventing chamber 52 for preventing the back flow of water in a turnover (the penetration of water into the turbocharger 24 and others) and a second exhaust pipe 53 , and is further exhausted into a stream made by the water jet pump 30 from the water muffler 60 via an exhaust gas/waste water pipe 54 .
  • An engine speed sensor that senses engine speed and a throttle angle sensor that senses an angle of the throttle valve are provided to the engine 20 .
  • a boost pressure sensor that senses boost pressure is provided to the turbocharger 24 .
  • the engine speed sensor, the throttle angle sensor and the boost pressure sensor are connected to a controller 100 of the jet propulsion boat 10 . Values measured by these sensors are constantly output to the controller 100 .
  • the controller 100 is an engine control unit (ECU) that controls the engine 20 , the turbocharger 24 and other parts of the engine.
  • ECU engine control unit
  • FIG. 4 is a graph showing the variation in time of engine (ENG) speed NE in the jet propulsion boat equivalent to this embodiment.
  • the x-axis shows time (sec) and the y-axis shows engine speed (rpm).
  • FIG. 5 is a flowchart showing the flow of a boost pressure control process in the jet propulsion boat equivalent to this embodiment.
  • the controller 100 receives the input of the angle of the throttle valve TH, reads target boost pressure POBJN corresponding to input engine speed based upon a program map of target boost pressure POBJN written to ROM of the controller 100 beforehand and controls the boost pressure of the turbocharger 24 based upon the target boost pressure POBJN. At this time, as the engine speed NE is low, target boost pressure POBJN read based upon the program map has a higher value than actual boost pressure PC.
  • an angle of the throttle valve TH of the engine 20 is made fully open because a rider grips the steering handlebar 13 provided with the throttle lever.
  • the engine speed sensor measures engine speed NE and outputs it to the controller 100 .
  • the throttle angle sensor measures an angle (fully open) of the throttle valve TH and outputs it to the controller 100 .
  • the controller 100 receives the input of the angle of the throttle valve TH and determines whether the input value is a preset value or more (a step S 1 in FIG. 5). It is a value in a fully open state that is a set value for an angle of the throttle valve in this embodiment.
  • the controller 100 sets a preset value 1 of boost pressure stored in ROM using time when the throttle valve becomes fully open as a trigger (Yes in the step S 1 ) at this time and controls the boost pressure of the turbocharger 24 based upon the preset value 1 (a step S 2 ). In the meantime, in case an angle of the throttle valve does not reach the set value (No in the step S 1 ), the step S 1 is repeated again.
  • the preset value 1 in a boost pressure control command WCMD is naturally set to a lower value than the target boost pressure used for the control of the turbocharger 24 .
  • the preset value 1 has a fixed value for a time base.
  • engine speed NE When the throttle valve (TH) is fully opened, engine speed NE accordingly rises.
  • the controller 100 executes feedback control over the target boost pressure POBJN based upon the raised engine speed NE. That is, the controller 100 calculates target boost pressure POBJN corresponding to the raised engine speed NE.
  • the target boost pressure POBJN of the turbocharger also rapidly rises together with engine speed NE, however, the controller 100 controls the boost pressure of the turbocharger 24 based upon the corresponding preset value 1 .
  • the engine speed sensor further measures engine speed NE for this while and outputs it to the controller 100 .
  • the controller 100 determines whether input engine speed NE is a set value or more. When engine speed NE reaches the set value (setting NE 1 shown in FIG. 4)(Yes in a step S 3 ), the controller sets a timer using this as a trigger (a step S 5 ) and further controls the boost pressure of the turbocharger 24 based upon the corresponding preset value 1 by fixed time (TIMER 1 ) from this time.
  • the controller 100 further calculates the rate of the rise of engine speed NE per time based upon input engine speed NE and elapsed time.
  • the controller 100 sets the timer using this as a trigger (the step S 5 ) and further controls the boost pressure of the turbocharger 24 based upon the corresponding preset value 1 by fixed time (TIMER 1 ) from this time.
  • the controller 100 calculates a preset reset value based upon actual boost pressure PC at the time and target boost pressure POBJN (a step S 7 ).
  • the controller 100 adds the calculated preset reset value to the preset value 1 and sets the added value (a step S 8 ).
  • the controller newly sets the timer using the setting of the added value as a trigger as in the step S 5 (a step S 9 ) and further controls the boost pressure of the turbocharger 24 based upon the corresponding added value (the preset value 1 +the preset reset value) by fixed time (TIMER 2 ) from this time.
  • the controller 100 When it is determined by the timer that fixed time (TIMER 2 ) elapses (Yes in a step S 10 ) since the added value is set, the controller 100 similarly calculates a preset reset value based upon actual boost pressure PC at the time and target boost pressure POBJN, further adds the calculated preset reset value and controls the boost pressure of the turbocharger 24 based upon the added value. In the meantime, the controller 100 controls the boost pressure of the turbocharger 24 based upon the added value until fixed time (TIMER 2 ) elapses (No in the step S 10 ).
  • the controller 100 executes the above-mentioned process until actual boost pressure PC is stabilized at target boost pressure POBJN, for example until the absolute value of the preset reset value is a set value or less.
  • the rate of the rise of engine speed is securely limited by such control over the boost pressure of the turbocharger 24 so that the rate is a fixed value or less.
  • the drive shaft 22 for drive of the impeller 32 is coupled to the output shaft 21 of the engine 20 via the coupler 21 a, the number of revolutions of the water jet pump is determined together with the corresponding engine speed.
  • the rate of the rise of engine speed or engine speed (the setting NE 1 ) can be determined.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Supercharger (AREA)
US10/827,925 2003-04-23 2004-04-19 Jet propulsion boat Abandoned US20040229522A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/226,098 US7048598B2 (en) 2003-04-23 2005-09-14 Jet propulsion boat

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003118352A JP4198515B2 (ja) 2003-04-23 2003-04-23 ジェット推進艇
JP2003-118352 2003-04-23

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/226,098 Continuation US7048598B2 (en) 2003-04-23 2005-09-14 Jet propulsion boat

Publications (1)

Publication Number Publication Date
US20040229522A1 true US20040229522A1 (en) 2004-11-18

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US10/827,925 Abandoned US20040229522A1 (en) 2003-04-23 2004-04-19 Jet propulsion boat
US11/226,098 Expired - Lifetime US7048598B2 (en) 2003-04-23 2005-09-14 Jet propulsion boat

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/226,098 Expired - Lifetime US7048598B2 (en) 2003-04-23 2005-09-14 Jet propulsion boat

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US (2) US20040229522A1 (fr)
JP (1) JP4198515B2 (fr)
CA (1) CA2464178C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008155448A1 (fr) * 2007-06-21 2008-12-24 Abb Oy Procédé et appareil pour commander l'entraînement par propulsion de navire

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005004658U1 (de) * 2005-03-22 2005-06-02 Rosenberger Hochfrequenztechnik Gmbh & Co. Kg Kfz-Dachantenne
US8190316B2 (en) * 2006-10-06 2012-05-29 Yamaha Hatsudoki Kabushiki Kaisha Control apparatus for marine vessel propulsion system, and marine vessel running supporting system and marine vessel using the same
JP5181334B2 (ja) * 2008-03-17 2013-04-10 本田技研工業株式会社 過給機付き内燃機関搭載車両
JP5004025B2 (ja) * 2008-03-28 2012-08-22 本田技研工業株式会社 ジェット推進艇のエンジン制御装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5190487A (en) * 1991-04-24 1993-03-02 Mitsubishi Denki Kabushiki Kaisha Control apparatus for an outboard marine engine
US5833501A (en) * 1997-07-15 1998-11-10 Brunswick Corporation Cavitation control for marine propulsion system
US6796289B2 (en) * 2001-10-30 2004-09-28 Honda Giken Kogyo Kabushiki Kaisha Ignition control apparatus for engine with turbocharger
US6855020B2 (en) * 2000-10-30 2005-02-15 Yamaha Hatsudoki Kabushiki Kaisha Running control device for watercraft

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08104293A (ja) 1994-10-04 1996-04-23 I D C Kk ウォータジェット推進装置
DE19812843B4 (de) * 1998-03-24 2006-07-06 Robert Bosch Gmbh Verfahren zur Ladedruckregelung einer Brennkraftmaschine
JP4320918B2 (ja) 2000-05-22 2009-08-26 株式会社Ｉｈｉ ウォータジェット船及びその推進制御方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5190487A (en) * 1991-04-24 1993-03-02 Mitsubishi Denki Kabushiki Kaisha Control apparatus for an outboard marine engine
US5833501A (en) * 1997-07-15 1998-11-10 Brunswick Corporation Cavitation control for marine propulsion system
US6855020B2 (en) * 2000-10-30 2005-02-15 Yamaha Hatsudoki Kabushiki Kaisha Running control device for watercraft
US6796289B2 (en) * 2001-10-30 2004-09-28 Honda Giken Kogyo Kabushiki Kaisha Ignition control apparatus for engine with turbocharger

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008155448A1 (fr) * 2007-06-21 2008-12-24 Abb Oy Procédé et appareil pour commander l'entraînement par propulsion de navire

Also Published As

Publication number Publication date
JP4198515B2 (ja) 2008-12-17
US20060009095A1 (en) 2006-01-12
JP2004324483A (ja) 2004-11-18
US7048598B2 (en) 2006-05-23
CA2464178C (fr) 2006-07-11
CA2464178A1 (fr) 2004-10-23

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HONDA MOTOR CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:URAKI, MAMORU;SUGIYAMA, HIDEKI;TSUCHIYA, MASAHIKO;REEL/FRAME:014829/0459

Effective date: 20040517

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION