FOUR-STROKE ENGINE

WIPO Patent Application WO/2023/209895

A1

Provided is a four-stroke engine, wherein a control device: executes, by switching therebetween, a multi-injection control for controlling a fuel injection device so that closed intake valve injection in which the supply of fuel is terminated during a closed-valve period before an intake valve opens and open intake valve injection in which the supply of fuel is terminated during an open-valve period where the intake valve is open are both performed within a single combustion cycle, and a single-injection control for controlling the fuel injection device so that the closed intake valve injection is performed and the open intake valve injection is not performed within a single combustion cycle; sets, in the multi-injection control and in the single-injection control, a limit amount for a closed intake valve injection amount that is an amount of fuel injected in the closed intake valve injection; and if the closed intake valve injection amount exceeds the limit amount, then executes the multi-injection control so that at least as much fuel as the excess amount above the limit amount is supplied in the open intake valve injection.

HAMAMATSU SHIGERU (JP)
SUGIMOTO TAKASHI (JP)
ITO MASAHIKO (JP)

PCT/JP2022/019159

November 02, 2023

April 27, 2022

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YAMAHA MOTOR CO LTD (JP)

F02D17/00; F02D41/34; F02D45/00

JPH06280660A	1994-10-04
JP2009144649A	2009-07-02
JPH11247681A	1999-09-14
JPS639656A	1988-01-16
JP2008151095A	2008-07-03
JPS62150044A	1987-07-04
JPH05141293A	1993-06-08
JPH11257130A	1999-09-21

SAKAI INTERNATIONAL PATENT OFFICE (JP)

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